Patent Application
20250006978
The present application relates to a field of batteries, and in particular, to an electrode plate manufacturing device (i.e., device for manufacturing an electrode plate) and an electrode plate manufacturing method (i.e., method for manufacturing an electrode plate).
Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The battery includes an electrode assembly which is a component where electrochemical reactions occur, in the battery. The electrode assembly is formed mainly by winding or stacking a positive electrode plate and a negative electrode plate.
At present, the manufacturing of an electrode plate is performed mainly by a wet method technology and a dry method technology. However, the performance of the electrode plate manufactured by the dry method technology is often poor.
An object of embodiments of the present application is to provide an electrode plate manufacturing device and an electrode plate manufacturing method, which aim to alleviate the problem that the performance of the electrode plate manufactured by the dry method technology in the related art is often poor.
In a first aspect, embodiments of the present application provides an electrode plate manufacturing device, wherein the electrode plate manufacturing device includes an extrusion mechanism, a film forming mechanism and a combination mechanism, the extruding mechanism is used for extruding out an active material slurry to form a blank; the film forming mechanism is provided downstream of the extrusion mechanism, and the film forming mechanism is used to thin the blank to form a film; and the combination mechanism is arranged downstream of the film forming mechanism, and the combination mechanism is used to combine the film and a substrate to form an electrode plate.
In the above technical solution, the electrode plate manufacturing device extrudes, through the extrusion mechanism, the active material slurry out to form a blank, so that the powder and particles in the active material slurry can be mixed evenly. The blank is formed into a film through the film forming mechanism, which is beneficial to controlling the thickness and uniformity of the formed film, compared to directly forming a film from the active material powder and particles. By using the electrode plate manufacturing device to manufacture the electrode plate, the uniformity of the active material layer is good, the performance of the electrode plate is excellent, and the manufacturing efficiency is high.
As an optional technical solution of embodiments of the present application, the film forming mechanism includes a rolling mechanism, and the rolling mechanism is used for rolling the blank to thin the blank to form the film.
In the above technical solution, by means of rolling the blank using the rolling mechanism, the blank is thinned to form the film, enabling high efficiency and good uniformity.
As an optional technical solution of embodiments of the present application, the rolling mechanism includes multiple pressure rollers, wherein a rolling gap for allowing the blank to pass therethrough is formed between two adjacent pressure rollers.
In the above technical solution, by providing the multiple pressure rollers, the multiple pressure rollers can gradually thin the blank to form the film, wherein the degree of thinning each time may not be too large, which is beneficial to improving the uniformity and thickness consistency of the film.
As an optional technical solution of embodiments of the present application, multiple rolling gaps are formed between the multiple pressure rollers, and the widths of the multiple rolling gaps gradually decrease in the conveying direction of the blank.
In the above technical solution, the widths of the multiple rolling gaps gradually decrease in the conveying direction of the blank, facilitating thinning the blank gradually such that the degree of thinning each time may not be too large, which is beneficial to improving the uniformity and thickness consistency of the film.
As an optional technical solution of embodiments of the present application, in the conveying direction of the blank, the pressure roller located at the tail end in the multiple pressure rollers is a first pressure roller, and the combination mechanism includes a combination roller, wherein a combination gap for allowing the film and the substrate to pass therethrough is formed between the combination roller and the first pressure roller.
In the above technical solution, the combination roller cooperates with the first pressure roller to roll the film and the substrate, to combine the film and the substrate into an electrode plate. The first pressure roller is used as both the component for rolling the blank and the component for combining the film and the substrate. One component realizes two functions, simplifying the structure of the electrode plate manufacturing device, and reducing the cost of the electrode plate manufacturing device.
As an optional technical solution of embodiments of the present application, the angular speed of the combination roller is ω1, the radius of the combination roller is r1, the angular speed of the first pressure roller is ω2, and the radius of the first pressure roller is r2, satisfying: ω1×r1>ω2×r2.
In the above technical scheme, the product of the angular speed of the combination roller and the radius of the combination roller is a first linear speed at which the combination roller rolls the film and the substrate, and the product of the angular speed of the first pressure roller and the radius of the first pressure roller is a second linear speed at which the first pressure roller rolls the film and the substrate. By making the first linear speed greater than the second linear speed, it is beneficial to attaching the combined electrode plate to the combination roller, avoiding that the combined electrode plate randomly shifts to cause the electrode plate to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: r1=r2 and ω1>ω2.
In the above technical solution, by making the radius of the combination roller equal to the radius of the first pressure roller and making the angular speed of the combination roller greater than the angular speed of the first pressure roller, the first linear speed is made to be greater than the second linear speed, such that the combined electrode plate is attached to the combination roller, avoiding that the combined electrode plate randomly shifts to cause the electrode plate to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: ω1=ω2 and r1>r2.
In the above technical solution, by making the angular speed of the combination roller equal to the angular speed of the first pressure roller and making the radius of the combination roller greater than the radius of the first pressure roller, the first linear speed is made to be greater than the second linear speed, such that the combined electrode plate is attached to the combination roller, avoiding that the combined electrode plate randomly shifts to cause the electrode plate to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: 1<(ω1×r1)/(ω2×r2)≤1.5.
In the above technical solution, the ratio of the first linear speed to the second linear speed is limited to be greater than 1 and less than or equal to 1.5, which is beneficial to ensuring the quality of rolling and simultaneously enabling the rolled electrode plate to better shift and be attached to the combination roller. For example, when (ω1×r1)/(ω2×r2)=1, the combined electrode plate cannot be stably attached to the combination roller, and the electrode plate randomly shifts between the combination roller and the first pressure roller, which may cause the electrode plate to be torn or uneven. When (ω1×r1)/(ω2×r2)<1, the electrode plate may shift to the first pressure roller, and the first pressure roller is wounded by both the film and the electrode plate, which may easily lead to production disorder. When (ω1×r1)/(ω2×r2)>1.5, the difference between the first linear speed of the combination roller and the second linear speed of the first pressure roller is too large, resulting in a poor rolling effect on the film and the substrate, i.e., poor combination effect.
As an optional technical solution of embodiments of the present application, the angular speed of the combination roller is ω1, and the radius of the combination roller is r1, satisfying: 1 m/min≤ω1×r1≤100 m/min.
In the above technical solution, the first linear speed of the combination roller is limited to 1-100 m/min, so as to ensure good rolling quality while having high rolling efficiency. When ω1×r1<1 m/min, although the rolling quality is good, the rolling speed is too slow and the rolling efficiency is low. When ω1×r1>100 m/min, although the rolling efficiency is high, the rolling quality is poor.
As an optional technical solution of embodiments of the present application, the width of the combination gap is 0-60 μm larger than the width of the rolling gap located at the extreme end in the conveying direction of the blank.
In the above technical solution, since the thickness of the substrate is generally 0-60 μm, the width of the combination gap is 0-60 μm larger than the width of the rolling gap located at the extreme end. The width of the combination gap may be equal to the width of the rolling gap located at the extreme end in the conveying direction of the blank, so that in the combination gap, the film and the substrate may be flattened and compacted to ensure that the film is not separated from the substrate.
As an optional technical solution of embodiments of the present application, in the conveying direction of the blank, in the two adjacent pressure rollers, the pressure roller near the head end is a second pressure roller, and the pressure roller near the tail end is a third pressure roller, the angular speed of the second pressure roller is ω3, the radius of the second pressure roller is r3, the angular speed of the third pressure roller is ω4, and the radius of the third pressure roller is r4, satisfying: ω3×r3<ω4×r4.
In the above technical scheme, the product of the angular speed of the second pressure roller and the radius of the second pressure roller is a third linear speed at which the second pressure roller rolls the blank, and the product of the angular speed of the third pressure roller and the radius of the third pressure roller is a fourth linear speed at which the third pressure roller rolls the film and the substrate. By making the fourth linear speed greater than the third linear speed, it is beneficial to attaching the rolled blank to the third pressure roller, avoiding that the rolled blank randomly shifts to cause the rolled blank to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: r3=r4 and ω3<ω4.
In the above technical solution, by making the radius of the second pressure roller equal to the radius of the third pressure roller and making the angular speed of the third pressure roller greater than the angular speed of the second pressure roller, the fourth linear speed is made to be greater than the third linear speed, such that the rolled blank is attached to the third pressure roller, avoiding that the rolled blank randomly shifts to cause the rolled blank to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: ω3=ω4 and r3<r4.
In the above technical solution, by making the angular speed of the second pressure roller equal to the angular speed of the third pressure roller and making the radius of the third pressure roller greater than the radius of the second pressure roller, the fourth linear speed is made to be greater than the third linear speed, such that the rolled blank is attached to the third pressure roller, avoiding that the rolled blank randomly shifts to cause the rolled blank to be torn or uneven.
As an optional technical solution of embodiments of the present application, they further satisfy: 1<(ω4×r4)/(ω3×r3)≤1.5.
In the above technical solution, the ratio of the fourth linear speed to the third linear speed is limited to be greater than 1 and less than or equal to 1.5, which is beneficial to ensuring the quality of rolling and simultaneously enabling the rolled blank to better shift and be attached to the third pressure roller. For example, when ω3×r3=1, the rolled blank cannot be stably attached to the third pressure roller, and the rolled blank randomly shifts between the second pressure roller and the third pressure roller, which may cause the rolled blank to be torn or uneven. When ω1×r1<1, the rolled blank may shift towards the second pressure roller, which may easily lead to production disorder. When ω1×r1>1.5, the difference between the fourth linear speed of the third pressure roller and the third linear speed of the second pressure roller is too large, resulting in a poor rolling effect on the blank and thus poor film quality.
As an optional technical solution of embodiments of the present application, the film forming mechanism further includes a detection unit and an adjustment mechanism, wherein the detection unit is used to detect the roller pressure of each of the pressure rollers for rolling the blank; and the adjustment mechanism is connected with the pressure roller, and the adjustment mechanism is used to increase or decrease the pressure applied to the pressure roller according to the detection result of the detection unit.
In the above technical solution, the detection unit is provided to detect the roller pressure for rolling the blank, and when the roller pressure is relatively large, the adjustment mechanism reduces the pressure applied to the pressure roller. When the roller pressure is relatively small, the adjustment mechanism increases the pressure applied to the pressure roller, so that the roller pressure remains within a preset range. As a result, the roller pressure for rolling the blank is relatively uniform, which is beneficial to improving the quality of the formed film.
As an optional technical solution of embodiments of the present application, the film forming mechanism includes a first extrusion element and a second extrusion element, wherein the second extrusion element is arranged opposite to the first extrusion element, and the second extrusion element and the first extrusion element are used to cooperate with each other to extrude the blank to thin the blank to form the film
In the above technical solution, the blank is extruded through the first extrusion element and the second extrusion element, such that the blank is extruded and thinned to form the film, enabling high extrusion efficiency and small occupied area.
In a second aspect, embodiments of the present application further provide an electrode plate manufacturing method. The electrode plate manufacturing method includes extruding out an active material slurry to form a blank; thinning the blank to form a film; and combining the film and a substrate to form an electrode plate.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without paying creative work.
10—electrode plate manufacturing device; 100—extrusion mechanism; 200—film forming mechanism; 210—rolling mechanism; 211—first pressure roller; 212—second pressure roller; 213—third pressure roller; 214—rolling gap; 220—detection unit; 230—adjustment mechanism; 240—first extrusion element; 250—second extrusion element; 300—combination mechanism; 320—combination gap; 400—blank; 500—film; 600—substrate; 700—electrode plate.
Embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples, rather than limiting the protection scope of the present application.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terms used herein are only for the purpose of describing embodiments, and are not intended to limit the present application. Terms “comprising” and “having” and any variations thereof in the specification and claims of the present application and the above description of the drawings are intended to cover a non-exclusive inclusion.
In the description of the embodiments of the present application, technical terms such as “first” and “second” are only used to distinguish different objects, and should not be understood as indicating or implying importance in relativity or implicitly indicating the number, specific sequence, or primary-subordinate relationship of the indicated technical features. In the description of the embodiments of the present application, “plurality” means two or more, unless otherwise specifically defined.
Reference made herein to “embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The phases occurring in various places in the specification do not necessarily all refer to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein may be combined with other embodiments.
In description of the embodiments of the present application, the term “and/or” in the present application indicates only an association relationship describing associated objects, meaning that there may be three kinds of relationships. For example, A and/or B may indicate three situations: there is only A, there are both A and B, and there is only B. In addition, the character “/” here generally indicates that the associated objects therebefore and thereafter have an “or” relationship.
In the description of the embodiments of the present application, “multiple” means two or more (including two). Similarly, “multiple groups” means two or more groups (including two groups), and “multiple pieces” means two or more pieces (including two pieces).
In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc. are based on orientation or positional relationship shown in the drawings, only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as “install”, “link”, “connect” and “fix” should be understood in a broad sense, for example, it may be a fixed connection, or a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediary, or it may be an internal communication between two elements or an interaction relationship between two elements. Those of ordinary skill in the art may understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.
At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. The batteries are not only used in energy storage power source systems such as hydraulic, thermal, wind and solar power plants, but also widely used in electric means of transport such as electric bicycles, electric motorcycles, electric vehicles, as well as fields of military equipment and aerospace, etc. With the continuous expansion of battery application fields, its market demand is also constantly increasing.
The battery includes an electrode assembly which is a component where
electrochemical reactions occur, in the battery. The electrode assembly is formed mainly by winding or stacking a positive electrode plate and a negative electrode plate. The inventors noted that the manufacturing of an electrode plate is performed mainly by a wet method technology and a dry method technology. However, the performance of the electrode plate manufactured by the dry method technology is often poor.
The inventors further studied and found that when using dry method technology to manufacture the electrode plate, the powder and particles of the active material are supplied to the surface of the roller, and the powder and particles of the active material are directly rolled to form a film. For the film formed in this way, the powder and particles of the active material cannot be mixed evenly, and the thickness of the film is also not easy to guarantee. The uniformity of the active material layer of the electrode plate produced using such film is poor, resulting in poor performance of the electrode plate.
In view of this, embodiments of the present application provide an electrode plate manufacturing device, which includes an extrusion mechanism, a film forming mechanism and a combination mechanism. The extrusion mechanism is used to extrude out the active material slurry to form a blank. The film forming mechanism is provided downstream of the extrusion mechanism, and the film forming mechanism is used to thin the blank to form a film. The combination mechanism is provided downstream of the film forming mechanism, and the combination mechanism is used to combine the film and the substrate to form an electrode plate.
The electrode plate manufacturing device extrudes, through the extrusion mechanism, the active material slurry out to form a blank, so that the powder and particles in the active material slurry may be mixed evenly. The blank is formed into a film through the film forming mechanism, which is beneficial to controlling the thickness and uniformity of the formed film, compared to directly forming a film from the active material powder and particles. By using the electrode plate manufacturing device to manufacture the electrode plate, the uniformity of the active material layer is good, the performance of the electrode plate is excellent, and the manufacturing efficiency is high.
The technical solutions described in the embodiments of the present application are applicable to the manufacturing of the electrode plate.
Referring to
The extrusion mechanism 100 is a mechanism capable of performing an extrusion molding process. The extrusion mechanism 100 may be used to extrude the active material slurry out to form a blank 400, facilitating mixing the active material evenly. The extrusion mechanism 100 includes, but is not limited to, a plunger extrusion mechanism, a twin-screw extrusion mechanism, a single-screw extrusion mechanism, and the like.
The active material slurry refers to a mixture containing solvent, active material powder and/or active material particles. The active material powder and/or active material particles may be dissolved in the solvent, thereby facilitating uniform mixing. Compared with the solution of containing only active material powder and/or active material particles, it may realize more uniform and thorough mixing. In order to further improve the performance of the film 500, the proportion of the active material powder and/or active material particles may be increased to prepare an active material slurry with high solid content.
The blank 400 is a product formed after extruding the active material slurry. The blank 400 has a relatively large thickness, has a self-supporting capacity, and is not easy to break. The blank 400 generally has a thickness of 1˜10 mm.
The film forming mechanism 200 is a mechanism capable of thinning the blank 400 to form a film 500. Since the blank 400 is too thick to be directly combined with the substrate 600, the blank 400 is thinned by the film forming mechanism 200 to form the film 500. The film 500 formed by thinning by the film forming mechanism 200 has better active material uniformity and more uniform thickness, which is conducive to improving the quality of the electrode plate 700.
The combination mechanism 300 is a mechanism that combines the film 500 and the substrate 600 to form the electrode plate 700. From the perspective of the electrode plate 700, the film 500 is the active material layer of the electrode plate 700, and the substrate 600 is the current collector of the electrode plate 700. The substrate 600 of the positive electrode plate may be made of aluminum, and the active material of the positive electrode plate may be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The substrate 600 of the negative electrode plate may be made of copper, and the active material of the negative electrode plate may be carbon or silicon, etc.
The electrode plate manufacturing device 10 extrudes, through the extrusion mechanism 100, the active material slurry out to form a blank 400, so that the powder and particles in the active material slurry may be mixed evenly. The blank 400 is formed into a film 500 through the film forming mechanism 200, which is beneficial to controlling the thickness and uniformity of the formed film 500, compared to directly forming a film 500 from the active material powder and particles. By using the electrode plate manufacturing device 10 to manufacture the electrode plate 700, the uniformity of the active material layer is good, the performance of the electrode plate 700 is excellent, and the manufacturing efficiency is high.
Referring to
The rolling mechanism 210 is a mechanism for making a material continuously plastically deformed. When the rolling mechanism 210 rolls the blank 400, the thickness of the blank 400 may be reduced, and the blank 400 may be formed as the film 500 just after the thickness is reduced to meet the design requirement.
By means of rolling the blank 400 using the rolling mechanism 210, the blank 400 is thinned to form the film 500, enabling high efficiency and good uniformity.
Referring to
The “multiple pressure rollers” refers to two pressure rollers, three pressure rollers or more than three pressure rollers. Referring to
“A rolling gap 214 for allowing the blank 400 to pass therethrough is formed between two adjacent pressure rollers” means that two adjacent pressure rollers cooperate with each other to roll the blank 400, to reduce the thickness of the blank 400 to be equal to the width of the rolling gap 214.
By providing the multiple pressure rollers, the multiple pressure rollers can gradually thin the blank 400 to form the film 500, wherein the degree of thinning each time may not be too large, which is beneficial to improving the uniformity and thickness consistency of the film 500.
In some embodiments, multiple rolling gaps 214 are formed between the multiple pressure rollers, and the widths of the multiple rolling gaps 214 gradually decrease in the conveying direction of the blank 400.
In “multiple rolling gaps 214 are formed between the multiple pressure rollers”, the number of the multiple pressure rollers is at most 1 more than the number of the multiple rolling gaps 214. For example, two pressure rollers form one rolling gap 214. For another example, three pressure rollers form two rolling gap 214. Four pressure rollers form three rolling gap 214. Certainly, the four pressure rollers may also form two rolling gap 214.
A straight line that is located in the same plane as the axes of two adjacent pressure rollers and is perpendicular to the axes of the two adjacent pressure rollers is a first straight line. The intersection point of the first straight line and the circumferential surface of one pressure roller thereof is the first intersection point, the intersection point of the first straight line and the circumferential surface of the other pressure roller is the second intersection point, and the width of the rolling gap 214 is the distance between the first intersection point and the second intersection point. The width of the rolling gap 214 may also be simply understood as the minimum distance between the circumferential surfaces of the two pressure rollers.
The conveying direction of the blank 400 refers to the winding direction in which the blank 400 is wound around the multiple pressure rollers sequentially, rather than the extrusion direction in which the extrusion mechanism 100 extrudes out the blank 400.
The widths of the multiple rolling gaps 214 gradually decrease in the conveying direction of the blank 400, facilitating thinning the blank 400 gradually such that the degree of thinning each time may not be too large, which is beneficial to improving the uniformity and thickness consistency of the film 500.
Referring to
The first pressure roller 211 specifically refers to the pressure roller located at the extreme end in the multiple pressure rollers in the conveying direction of the blank 400. Referring to
The combination roller 310 is a roller structure used to combine the film 500 and the substrate 600. In the present embodiment, just through the cooperation between the combination roller 310 and the first pressure roller 211, the film 500 and the substrate 600 are combined, which can reduce the number of combination rollers 310. Certainly, in some embodiments, the combination mechanism 300 may include multiple combination rollers 310, and the multiple combination rollers 310 cooperate to roll the film 500 and the substrate 600 to combine the film 500 and the substrate 600.
The combination roller 310 cooperates with the first pressure roller 211 to roll the film 500 and the substrate 600 to combine the film 500 and the substrate 600 into an electrode plate 700. The first pressure roller 211 is used as both the component for rolling the blank 400 and the component for combining the film 500 and the substrate 600. One component realizes two functions, simplifying the structure of the electrode plate manufacturing device 10, and reducing the cost of the electrode plate manufacturing device 10.
Referring to
A straight line that is located in the same plane as the axes of the first pressure 211 and the combination roller 310 and is perpendicular to the axes of the first pressure 211 and the combination roller 310 is the second straight line. The intersection point of the second straight line and the circumferential surface of the combination roller 310 is the third intersection point, and the intersection point of the second straight line and the circumferential surface of the first pressure roller 211 is the fourth intersection point. The angular speed ω1 of the combination roller 310 may be the angle that the third intersection point rotates in unit time. The angular speed ω2 of the first pressure roller 211 may be the angle that the fourth intersection point rotates in unit time.
The product of the angular speed of the combination roller 310 and the radius of the combination roller 310 is a first linear speed v1 (i.e. the linear speed v1 of the third intersection point) at which the combination roller 310 rolls the film 500 and the substrate 600, and the product of the angular speed of the first pressure roller 211 and the radius of the first pressure roller 211 is a second linear speed v2 (i.e. The linear speed v2 of the fourth intersection point) at which the first pressure roller 211 rolls the film 500 and the substrate 600.
By making the first linear speed greater than the second linear speed, it is beneficial to attaching the combined electrode plate 700 to the combination roller 310, avoiding that the combined electrode plate 700 randomly shifts to cause the electrode plate 700 to be torn or uneven.
In some embodiments, they further satisfy: r1=r2 and ω1>ω2.
“r1=r2” means that the radius of the combination roller 310 is equal to the radius of the first pressure roller 211. “ω1>ω2” means the angular speed of the combination roller 310 is greater than the angular speed of the first pressure roller 211.
By making the radius of the combination roller 310 equal to the radius of the first pressure roller 211 and making the angular speed of the combination roller 310 greater than the angular speed of the first pressure roller 211, the first linear speed is made to be greater than the second linear speed, such that the combined electrode plate 700 is attached to the combination roller 310, avoiding that the combined electrode plate 700 randomly shifts to cause the electrode plate 700 to be torn or uneven.
Referring to
“ω1=ω2” means the angular speed of the combination roller 310 is equal to the angular speed of the first pressure roller 211. “r1>r2” means that the radius of the combination roller 310 is greater than the radius of the first pressure roller 211.
By making the angular speed of the combination roller 310 equal to the angular speed of the first pressure roller 211 and making the radius of the combination roller 310 greater than the radius of the first pressure roller 211, the first linear speed is made to be greater than the second linear speed, such that the combined electrode plate 700 is attached to the combination roller 310, avoiding that the combined electrode plate 700 randomly shifts to cause the electrode plate 700 to be torn or uneven.
In some embodiments, they further satisfy: 1<(ω1×r1)/(ω2×r2)≤1.5.
Since v1=ω1×r1 and v2=ω2×r2, “1<(ω1×r1)/(ω2×r2)≤1.5” may be also understood as 1<v1/v2≤1.5. That is, the ratio of the first linear speed to the second linear speed is greater than 1 and less than or equal to 1.5.
The ratio of the first linear speed to the second linear speed is limited to be greater than 1 and less than or equal to 1.5, which is beneficial to ensuring the quality of rolling and simultaneously enabling the rolled electrode plate 700 to better shift and be attached to the combination roller 310. For example, when (ω1×r1)/(ω2×r2)=1, the combined electrode plate 700 cannot be stably attached onto the combination roller 310, and the electrode plate 700 randomly shifts between the combination roller 310 and the first pressure roller 211, which may cause the electrode plate 700 to be torn or uneven. When (ω1×r1)/(ω2×r2)<1, the electrode plate 700 may shift to the first pressure roller 211, and the first pressure roller 211 is wounded by both the film 500 and the electrode plate 700, which may easily lead to production disorder. However, when (ω1×r1)/(ω2×r2)>1.5, the difference between the first linear speed of the combination roller 310 and the second linear speed of the first pressure roller 211 is too large, resulting in a poor rolling effect on the film 500 and the substrate 600, i.e., poor combination effect.
In some embodiments, the angular speed of the combination roller 310 is ω1, and the radius of the combination roller 310 is r1, satisfying: 1 m/min≤ω1×r1≤100 m/min.
“1 m/min≤ω1×r1≤100 m/min” may also be 1 m/min≤v1≤100 m/min. In other words, the first linear speed of the combination roller 310 is 1-100 m/min. For example, ω1×r1 may be 1 m/min, 10 m/min, 20 m/min, 30 m/min, 40 m/min, 50 m/min, 60 m/min, 70 m/min, 80 m/min, 90 m/min, 100 m/min, etc.
The first linear speed of the combination roller 310 is limited to 1-100 m/min, so as to ensure good rolling quality while having high rolling efficiency. When ω1×r1<1 m/min, although the rolling quality is good, the rolling speed is too slow and the rolling efficiency is low. When ω1×r1>100 m/min, although the rolling efficiency is high, the rolling quality is poor.
In some embodiments, the angular speed of the first pressure roller 211 is ω2, and the radius of the first pressure roller 211 is r2, satisfying: 1 m/min≤ω2×r2≤100 m/min.
“1 m/min≤ω2×r2≤100 m/min” may also be 1 m/min≤v2≤100 m/min. In other words, the second linear speed of the first pressure roller 211 is 1-100 m/min. For example, ω2×r2 may be 1 m/min, 10 m/min, 20 m/min, 30 m/min, 40 m/min, 50 m/min, 60 m/min, 70 m/min, 80 m/min, 90 m/min, 100 m/min, etc.
The second linear speed of the first pressure roller 211 is limited to 1-100 m/min, so as to ensure good rolling quality while having high rolling efficiency. When ω2×r2<1 m/min, although the rolling quality is good, the rolling speed is too slow and the rolling efficiency is low. When ω2×r2>100 m/min, although the rolling efficiency is high, the rolling quality is poor.
In some embodiments, the width of the combination gap 320 is 0-60 μm larger than the width of the rolling gap 214 located at the extreme end in the conveying direction of the blank 400.
The width of the combination gap 320 refers to the distance between the third intersection point and the fourth intersection point.
The “width of the rolling gap 214 located at the extreme end in the conveying direction of the blank 400” refers to the width of the rolling gap 210 formed between the first pressure roller 211 and the pressure roller adjacent thereto. In the embodiments in which the widths of the multiple rolling gaps 214 gradually decrease in the conveying direction of the blank 400, the width of the rolling gap 214 located at the extreme end in the conveying direction of the blank 400 refers to the width of the rolling gap 214 with the smallest width, in the multiple rolling gaps 214.
Since the thickness of the substrate 600 is generally 0-60 μm, the width of the combination gap 320 is 0-60 μm larger than the width of the rolling gap 214 located at the extreme end. The width of the combination gap 320 may be equal to the width of the rolling gap 214 located at the extreme end in the conveying direction of the blank 400, so that in the combination gap 320, the film 500 and the substrate 600 may be flattened and compacted to ensure that the film 500 is not separated from the substrate 600.
In some embodiments, in the conveying direction of the blank 400, in the two adjacent pressure rollers, the pressure roller near the head end is the second pressure roller 212, and the pressure roller near the tail end is the third pressure roller 213. The angular speed of the second pressure roller 212 is ω3, and the radius of the second pressure roller 212 is r3. The angular speed of the third pressure roller 213 is ω4, and the radius of the third pressure roller 213 is r4, satisfying: ω3×r3<ω4×r4.
The second pressure roller 212 is the pressure roller near the head end in the two adjacent pressure rollers in the conveying direction of the blank 400. The third pressure roller 213 is the pressure roller near the tail end in the two adjacent pressure rollers in the conveying direction of the blank 400. Here, the second pressure roller 212 and the third pressure roller 213 do not specifically refer to a certain pressure roller. For example, referring to
A straight line that is located in the same plane as the axes of the second pressure 212 and the third pressure roller 213 and is perpendicular to the axes of the second pressure 212 and the third pressure roller 213 is the third straight line. The intersection point of the third straight line and the circumferential surface of the second pressure roller 212 is the fifth intersection point, and the intersection point of the third straight line and the circumferential surface of the third pressure roller 213 is the sixth intersection point.
ω3×r3 is the product of the angular speed of the second pressure roller 212 and the radius of the second pressure roller 212, that is, the third linear speed v3 (that is, the linear speed v3 of the fifth intersection point) at which the second pressure roller 212 rolls the blank 400, and ω4×r4 is the product of the angular speed of the third pressure roller 213 and the radius of the third pressure roller 213, that is, the fourth linear speed v4 (that is, the linear speed v4 of the sixth intersection point) at which the third pressure roller 213 rolls the blank 400.
The product of the angular speed of the second pressure roller 212 and the radius of the second pressure roller 212 is a third linear speed at which the second pressure roller 212 rolls the blank 400, and the product of the angular speed of the third pressure roller 213 and the radius of the third pressure roller 213 is a fourth linear speed at which the third pressure roller 213 rolls the film 500 and the substrate 600. By making the fourth linear speed greater than the third linear speed, it is beneficial to attaching the rolled blank 400 to the third pressure roller 213, avoiding that the rolled blank 400 randomly shifts to cause the rolled blank 400 to be torn or uneven.
In some embodiments, they further satisfy: r3=r4 and ω3<ω4.
“r3=r4” means that the radius of the second pressure roller 212 is equal to
the radius of third pressure roller 213. “ω4>ω3” means the angular speed of the third pressure roller 213 is greater than the angular speed of the second pressure roller 212.
By making the radius of the second pressure roller 212 equal to the radius
of the third pressure roller 213 and making the angular speed of the third pressure roller 213 greater than the angular speed of the second pressure roller 212, the fourth linear speed is made to be greater than the third linear speed, such that the rolled blank 400 is attached to the third pressure roller 213, avoiding that the rolled blank 400 randomly shifts to cause the rolled blank 400 to be torn or uneven.
Referring to
“ω3=ω4” means the angular speed of the second pressure roller 212 is equal to the angular speed of the third pressure roller 213. “r4>r3” means that the radius of the third pressure roller 213 is greater than the radius of the second pressure roller 212.
By making the angular speed of the second pressure roller 212 equal to the angular speed of the third pressure roller 213 and making the radius of the third pressure roller 213 greater than the radius of the second pressure roller 212, the fourth linear speed is made to be greater than the third linear speed, such that the rolled blank 400 is attached to the third pressure roller 213, avoiding that the rolled blank 400 randomly shifts to cause the rolled blank 400 to be torn or uneven.
In some embodiments, they further satisfy: 1<(ω4×r4)/(ω3×r3)≤1.5.
Since v3=ω3×r3 and v4=ω4×r4, “1<(ω4×r4)/(ω3×r3)≤1.5” may be also understood as 1<v4/v3≤1.5. That is, the ratio of the fourth linear speed to the third linear speed is greater than 1 and less than or equal to 1.5.
The ratio of the fourth linear speed to the third linear speed is limited to be greater than 1 and less than or equal to 1.5, which is beneficial to ensuring the quality of rolling and simultaneously enabling the rolled blank 400 to better shift and be attached to the third pressure roller 213. For example, when (ω4×r4)/(ω3×r3)=1, the rolled blank 400 cannot be stably attached to the third pressure roller 213, and the rolled blank 400 randomly shifts between the second pressure roller 212 and the third pressure roller 213, which may cause the rolled blank 400 to be torn or uneven. When (ω4×r4)/(ω3×r3)<1, the rolled blank 400 may shift towards the second pressure roller 212, which may easily lead to production disorder. However, when (ω4×r4)/(ω3×r3)<1.5, the difference between the fourth linear speed of the third pressure roller 213 and the third linear speed of the second pressure roller 212 is too large, resulting in a poor rolling effect of the blank 400 and thus poor quality of the film 500.
Referring to
“1 m/min≤ω3×r3≤100 m/min” may also be 1 m/min≤v3≤100 m/min. In other words, the first linear speed of the second pressure roller 212 is 1˜100 m/min. For example, ω3×r3 may be 1 m/min, 10 m/min, 20 m/min, 30 m/min, 40 m/min, 50 m/min, 60 m/min, 70 m/min, 80 m/min, 90 m/min, 100 m/min, etc.
The third linear speed of the first pressure roller 212 is limited to 1-100 m/min, so as to ensure good rolling quality while having high rolling efficiency. When ω3×r3<1 m/min, although the rolling quality is good, the rolling speed is too slow and the rolling efficiency is low. When ω3×r3>100 m/min, although the rolling efficiency is high, the rolling quality is poor.
In some embodiments, the width of the rolling gap 214 is 10-500 μm, which can better roll the blank 400 into the film 500.
In some embodiments, the multiple pressure rollers are arranged in a horizontal direction in the space to support the blank 400 when the blank 400 enters the first rolling gap 214.
Referring to
Certainly, since the blank 400 in the present embodiment has self-supporting capacity, the multiple pressure rollers can be arranged randomly, so as to improve the space utilization rate and increase the flexibility of providing the pressure rollers.
Referring to
The detection unit 220 is a component for detecting the pressure on the first intersection point, the second intersection point, the fifth intersection point or the sixth intersection point. The detection unit 220 may be a pressure sensor or a piezoelectric sensor. The adjustment mechanism 230 is a mechanism connected with the pressure rollers and capable of changing the pressures on the pressure rollers. For example, the adjustment mechanism 230 may be a hydraulic pressurization mechanism, a pneumatic pressurization mechanism, an electric pressurization mechanism, etc.
The detection unit 220 is provided to detect the roller pressure for rolling the blank 400, and when the roller pressure is relatively large, the adjustment mechanism 230 reduces the pressure applied to the pressure roller. When the roller pressure is relatively small, the adjustment mechanism 230 increases the pressure applied to the pressure roller, so that the roller pressure remains within a preset range. As a result, the roller pressure for rolling the blank 400 is relatively uniform, which is beneficial to improving the quality of the formed film 500.
In some embodiments, the preset range is 0.1-50 T, and the effect of rolling the blank 400 is better when the roller pressure is within this range.
Referring to
The first extrusion element 240 and the second extruded element 250 can cooperate to extrude the blank 400, so as to reduce the thickness of the blank 400 to shape the blank 400 into the film 500. The first extrusion element 240 may be a pressure plate, and the second extrusion element 250 may be a supporting table. When working, the extrusion mechanism 100 extrudes out a certain amount of blank 400 to between the first extrusion element 240 and the second extrusion clement 250, and then suspends the extrusion. The first extrusion element 240 moves towards the second extruded element 250 to extrude and thin the blank 400, to shape the blank 400 into the film 500. Then, the combination mechanism 300 combines the film 500 and the substrate 600 to form the electrode plate 700. The extrusion mechanism 100 continues to extrude, and the above steps are repeated to continuously produce the electrode plates 700.
The blank is extruded through the first extrusion element 240 and the second extrusion element 250, such that the blank 400 is extruded and thinned to form the film 500, enabling high extrusion efficiency and small occupied area.
Referring to
By extruding out the active material slurry to form the blank 400, the powder and particles in the active material slurry may be mixed evenly. By forming the blank 400 into the film 500, it is beneficial to controlling the thickness and uniformity of the formed film 500, compared to directly forming a film 500 from the active material powder and particles. By using the electrode plate 700 manufacturing method to manufacture the electrode plate 700, the uniformity of the active material layer is good, the performance of the electrode plate 700 is excellent, and the manufacturing efficiency is high.
According to some embodiments of the present application, reference is made to
Embodiments of the present application provide an electrode plate manufacturing device 10, the electrode plate manufacturing device 10 including an extrusion mechanism 100, a film forming mechanism 200 and a combination mechanism 300. The extrusion mechanism 100 is used to extrude out the active material slurry to form a blank 400. The film forming mechanism 200 is provided downstream of the extrusion mechanism 100, and the film forming mechanism 200 is used to thin the blank 400 to form a film 500. The combination mechanism 300 is provided downstream of the film forming mechanism 200, and the combination mechanism 300 is used to combine the film 500 and the substrate 600 to form an electrode plate 700.
The film forming mechanism 200 includes a rolling mechanism 210, and the rolling mechanism 210 is used for rolling the blank 400 to thin the blank 400 to form the film 500. The rolling mechanism 210 includes multiple pressure rollers, wherein a rolling gap 214 for allowing the blank 400 to pass therethrough is formed between two adjacent pressure rollers. In the conveying direction of the blank 400, in the multiple pressure rollers, the pressure roller located at the tail end is the first pressure roller. The combination mechanism 300 includes a combination roller 310, and a combination gap 320 for allowing the film 500 and the substrate 600 to pass therethrough is formed between the combination roller 310 and the first pressure roller 211.
The angular speed of combination roller 310 is ω1, the radius of the combination roller 310 is r1, and the angular speed of the first pressure roller 211 is ω2, and the radius of the first pressure roller 211 is r2, satisfying: ω1×r1>ω2×r2.
In the conveying direction of the blank 400, in the two adjacent pressure rollers, the pressure roller near the head end is a second pressure roller 212, and the pressure roller near the tail end is a third pressure roller 213, the angular speed of the second pressure roller 212 is ω3, the radius of the second pressure roller 212 is r3, the angular speed of the third pressure roller 213 is ω4, and the radius of the third pressure roller 213 is r4, satisfying: ω3×r3<ω4×r4.
The electrode plate manufacturing device 10 extrudes, through the extrusion mechanism 100, the active material slurry out to form a blank 400, so that the powder and particles in the active material slurry may be mixed evenly. The blank 400 is formed into a film 500 through the film forming mechanism 200, which is beneficial to controlling the thickness and uniformity of the formed film 500, compared to directly forming a film 500 from the active material powder and particles. By using the electrode plate manufacturing device 10 to manufacture the electrode plate 700, the uniformity of the active material layer is good, the performance of the electrode plate 700 is excellent, and the manufacturing efficiency is high.
By means of rolling the blank 400 using the rolling mechanism 210, the blank 400 is thinned to form the film 500, enabling high efficiency and good uniformity. By providing the multiple pressure rollers, the multiple pressure rollers can gradually thin the blank 400 to form the film 500, wherein the degree of thinning each time may not be too large, which is beneficial to improving the uniformity and thickness consistency of the film 500.
The combination roller 310 cooperates with the first pressure roller 211 to roll the film 500 and the substrate 600 to combine the film 500 and the substrate 600 into an electrode plate 700. The first pressure roller 211 is used as both the component for rolling the blank 400 and the component for combining the film 500 and the substrate 600. One component realizes two functions, simplifying the structure of the electrode plate manufacturing device 10, and reducing the cost of the electrode plate manufacturing device 10.
The product of the angular speed of the combination roller 310 and the radius of the combination roller 310 is a first linear speed at which the combination roller 310 rolls the film 500 and the substrate 600, and the product of the angular speed of the first pressure roller 211 and the radius of the first pressure roller 211 is a second linear speed at which the first pressure roller 211 rolls the film 500 and the substrate 600. By making the first linear speed greater than the second linear speed, it is beneficial to attaching the combined electrode plate 700 to the combination roller 310, avoiding that the combined electrode plate 700 randomly shifts to cause the electrode plate 700 to be torn or uneven.
The product of the angular speed of the second pressure roller 212 and the radius of the second pressure roller 212 is a third linear speed at which the second pressure roller 212 rolls the blank 400, and the product of the angular speed of the third pressure roller 213 and the radius of the third pressure roller 213 is a fourth linear speed at which the third pressure roller 213 rolls the film 500 and the substrate 600. By making the fourth linear speed greater than the third linear speed, it is beneficial to attaching the rolled blank 400 to the third pressure roller 213, avoiding that the rolled blank 400 randomly shifts to cause the rolled blank 400 to be torn or uneven.
Since the blank 400 in the present embodiment has self-supporting capacity, the multiple pressure rollers can be arranged randomly, so as to improve the space utilization rate and increase the flexibility of providing the pressure rollers.
The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirits and principles of the present application shall be included within the protection scope of the present application.
The present application is a continuation of International application PCT/CN2022/106721 filed on Jul. 20, 2022. The content of this application is incorporated herein by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/CN2022/106721 | Jul 2022 | WO |
| Child | 18884762 | US |
