The present application is based on and claims priority to Chinese Patent Application No. 202122354603.X, filed on Sep. 27, 2021, the entire content of which is incorporated herein by reference.
The present disclosure relates to the field of battery technologies, and in particular, to a connection member, a battery and a battery pack.
In related art, as for a current solution for connecting a composite tab, a protrusion is formed on a soft connection/welding sheet and punctures a single layer or a plurality of layers of composite tabs by an ultrasonic process. The protrusion is bonded with a soft connection/welding sheet on the other side. Through principle of the ultrasonic process, a friction welding is performed by a welding head together with the protrusion in a height direction of the tab. However, in this technical solution, a current flowing channel would be narrowed due to a lateral cracking of the tab.
The present disclosure is directed to at least solving one of the technical problems in the prior art. For this reason, the present disclosure proposes a connection member. For the connection member, by forming at least one end of at least one protrusion in a length direction of the at least one protrusion as a tip, resistance of a tab to a connection sheet is weakened, so that a force exerted on the tab by the connection sheet is relatively concentrated, thereby reducing possibility that a current flowing channel is narrowed due to a lateral cracking of the tab.
The present disclosure also proposes a battery.
The present disclosure also proposes a battery pack.
A connection member for electrically connecting a plurality of tabs of a current collector according to embodiments of the present disclosure includes a connection plate and at least one protrusion arranged on the connection plate and protruding from one side surface of the connection plate in a thickness direction of the connection plate. At least one end of each of the at least one protrusion in a length direction of the at least one protrusion is formed as a tip in a plane perpendicular to the thickness direction of the connection plate. The tip is configured to puncture the plurality of tabs in the length direction of the at least one protrusion.
For the connection member according to the embodiments of the present disclosure, by forming at least one end of each of the at least one protrusion in the length direction of the at least one protrusion as the tip in the plane perpendicular to the thickness direction of the connection plate, resistance of the tab to a connection sheet is weakened, so that a force exerted on the tab by the connection sheet is relatively concentrated, thereby reducing the possibility that the current flowing channel is narrowed due to the lateral cracking of the tab.
In some embodiments, each of the at least one protrusion includes a main section and a spike section that are connected to each other on one side surface of the connection plate. The spike section is connected to at least one end of the main section. In the length direction of the at least one protrusion, the main section extends straightly and has an identical cross section, and the spike section is formed as the tip in the plane perpendicular to the thickness direction of the connection plate.
In some embodiments, the spike section has a cross-section decreasing in a direction from the main section to the spike section.
In some embodiments, a cross section of the spike section parallel to the one side surface of the connection plate is formed in a semicircular, semi-elliptic, arcuate, trapezoidal or triangular shape.
In some embodiments, a cross section of the spike section parallel to the one side surface of the connection plate is formed in a triangular shape, and the spike section has an apex angle ranging from 20° to 120°.
In some embodiments, a chamfered or rounded section is formed between an end of the spike section away from the main section and an end of the spike section away from the connection plate, or a chamfered or rounded section is formed between an end of the spike section away from the main section and an end of the main section away from the connection plate.
In some embodiments, the spike section has a length smaller than or equal to 2 mm in a direction from the main section to the spike section.
In some embodiments, each of the at least one protrusion includes a connection section and a puncturing section that are connected to each other in a protruding height direction of the at least one protrusion. The connection section is connected to the connection plate, and the puncturing section is connected to an end of the connection section away from the connection plate and is configured to puncture the plurality of tabs in the thickness direction of the connection plate.
In some embodiments, the one side surface of the connection plate is in an arc connection with a side surface of the connection plate parallel to the thickness direction of the connection plate.
In some embodiments, the connection plate and of the at least one protrusion are integrally formed, and/or the at least one protrusion is arranged in a matrix on the one side surface of the connection plate.
A battery according to embodiments of the present disclosure includes a current collector and a conductive connection assembly. The current collector includes a plurality of electrode plates laminated to each other, and each of the plurality of electrode plates includes a tab. The conductive connection assembly includes the connection member according to any one of embodiments as described above, and the at least one protrusion of the connection member penetrates the plurality of tabs and is electrically connected to the tabs.
For the battery according to the present disclosure, by applying the current collector assembly as described above to the battery, an assembly difficulty of the battery is lowered, and the manufacturing time of the battery is shortened. In addition, the labor cost is lowered, and the reliability of the battery is ensured.
In some embodiments, the at least one protrusion is electrically connected to the plurality of tabs by puncturing the plurality of tabs through a high-frequency vibration. A vibration direction of the high-frequency vibration is parallel to the length direction of the at least one protrusion.
In some embodiments, each of the plurality of electrode plates includes a support insulation layer, a first conductive layer and a second conductive layer, and the first conductive layer and the second conductive layer cover two side surfaces of the support insulation layer in a thickness direction of the support insulation layer, respectively.
A battery pack according to embodiments of the present disclosure includes the battery according to the above embodiments of the present disclosure.
For the battery pack according to the embodiments of the present disclosure, by providing the battery as described above, safety performance of the battery pack can be improved and reliability of the battery pack is ensured, thereby avoiding dangers from occurring.
The additional aspects and the advantages of the present disclosure will be partially set forth in the following description, and in part will be apparent from the following description, or may be learned by practice of the present disclosure.
Reference Signs:
Embodiments of the present disclosure will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which identical or similar reference signs denote identical or similar elements or elements with identical or similar functions through the accompanying drawings. The following embodiments described with reference to the drawings are illustrative and intended to explain the present disclosure, rather than being interpreted as limitations on the present disclosure.
Firstly, a battery according to embodiments of the present disclosure will be briefly described with reference to
In an embodiment, as shown in
The connection member 100 according to embodiments the present disclosure will be described with reference to
As shown in
In an embodiment, as shown in
In the related art, since two ends of the protrusion portion has flat surface, resistance of the tab to the connection member is increased. Further, due to interaction force, an effect of an end surface of the connection member on the tabs is strengthened, which easily causes the tab to crack outwards. Therefore, resistance of the tab 200 to a connection sheet is weakened, and thus a force exerted on the tab 200 by the connection sheet to the tab 200 is relatively concentrated, thereby avoiding a current flowing channel from being narrowed due to a lateral cracking of the tab 200.
It should be noted that the current flowing channel refers to a channel, through which the current flows. The current flows in a direction away from the battery along the tab 200. In the related art, as shown in
For example, as shown in
For the connection member 100 according to the embodiments of the present disclosure, by forming at least one end of the protrusion 120 in the length direction as the tip in the plane perpendicular to the thickness direction of the connection plate 110, resistance of the tab 200 to a connection sheet is weakened, so that the force exerted on the tabs by the connection sheet is relatively concentrated, thereby preventing the current flowing channel from being narrowed due to the lateral cracking of the tab 200.
In an embodiment of the present disclosure, as shown in
For example, as shown in
In an embodiment of the present disclosure, as shown in
For example, as shown in
Further, the main section 121 and the spike section 122 are in smooth transition. As a frication is generated between the tab 200 and the protrusion 120 during the welding, the protrusion 120 in which the main section 121 and the spike section 122 are in smooth transition is not prone to damage the tab 200. Thus, it is possible to recede the possibility of the lateral cracking of the tab 200 and prolong service lives of the tab 200. Further, it is possible to ensure the yield of the battery, thereby improving the safety reliability of the battery pack.
In an embodiment of the present disclosure, as shown in
In some embodiment, as shown in
In an embodiment of the present disclosure, as shown in
It should be noted that when the apex angle of the spike section 122 is set to be greater than 120°, during pressing the protrusion 120 into the tab 200, there is still a great possibility that the tab 200 cracks laterally. since the main section 121 has constant lengths in the length direction and the thickness direction, when the apex angle of the spike section 122 is set to be smaller than 20°, the spike section 122 may have too large height in a direction away from the main section 121.
In a specific implementation, the apex angle of the spike section 122 may be set as 20°, 40°, 60°, 80°, 100° and 120°. For example, as shown in
In an embodiment of the present disclosure, as shown in
In an embodiment of the present disclosure, as shown in
In an embodiment, the length of the spike section 122 may be set as 2 mm, 1.8 mm, 1.6 mm, 1.4 mm, 1.2 mm, 1 mm, 0.8 mm, 0.6 mm, 0.4 mm, 0.2 mm and the like. Thus, the puncturing effect of the protrusion 120 can be ensured, and the welding difficulty between the tabs 200 and the connection member 100 is lowered. In addition, the possibility that the tab 200 cracks laterally can be reduced.
In an embodiment, the length of the spike section 122 may be set as 0.8 mm, 0.6 mm, 0.4 mm and 0.2 mm. Thus, the puncturing effect of the protrusion 120 can be ensured, and the welding difficulty between the tab 200 and the connection member 100 is lowered. In addition, the possibility that the tab 200 cracks laterally can be reduced.
In an embodiment of the present disclosure, as shown in
Further, the puncturing section 124 has a cross-section area decreasing in a height direction (for example, in a front-back direction, as shown in
For example, as shown in
Further, as shown in
In an embodiment of the present disclosure, as shown in
For example, as shown in
In an embodiment of the present disclosure, as shown in
Here, the protrusion 120 and the connection plate 110 are integrally formed. Therefore, the protrusion 120 and the connection plate 110 are the same in parameters of temperature resistance, resistance and the like, thereby ensuring the reliability of the battery 1000, and lowering the fault rate. In addition, it is also possible to ensure the use safety of the battery pack, thereby avoiding accidents from occurring. Meanwhile, the number of parts of the connection member 100 is reduced, which in turn improves the whole connection strength of the conductive connection assembly and the connection stability between the protrusion 120 and the tab 200, thereby lowering the rate of defective products of the conductive connection assembly and prolonging the service life of the conductive connection assembly.
In some embodiments of the present disclosure, as shown in
In some embodiments of the present disclosure, if the protrusion 120 has a length L in the direction of the ultrasonic wave vibration and a width d in the direction perpendicular to the ultrasonic wave vibration, L and d satisfy: L*2+d*2≥X, where X is a width of the tab 200. It should be understood that a perimeter of the protrusion 120 should be no less than the width of the tab 200. Here, it is also noted that the width X of the tab 200 is a length of a side of the tab 200 in the direction perpendicular to the ultrasonic wave vibration. Referring to
A battery according to embodiments of the present disclosure includes a current collector and a conductive connection assembly.
In some embodiments, the current collector includes a plurality of electrode plates laminated to each other, and each of the plurality of electrode plates includes a tab 200. The conductive connection assembly includes a connection member 100 according to the embodiments of the present disclosure as described. The plurality of protrusions 120 of the connection member 100 penetrates a plurality of tabs 200 and is electrically connected to the tabs 200.
Here, the plurality of tabs 200 is laminated to each other in the thickness directions of the tabs 200. The connection plate 110 is arranged on a side of the plurality of tabs 200 in the thickness directions. One end of the protrusion 120 is connected to the connection plate 110. The protrusion 120 penetrates the plurality of tabs 200 and is electrically connected to the tabs 200. The protrusion 120 may be formed on the connection plate 110, and puncture the plurality of tabs 200 by a high-frequency vibration at a vibration frequency ranging from 15 KHz to 40 KHz.
The protrusion 120 punctures the plurality of tabs 200 by the high-frequency vibration, and the high-frequency vibration is applied on a contact surface of an object to be welded, so that a friction is generated between surfaces of two objects to generate heat, thereby forming fusion between molecular layers, which in turn increased a welding speed between the protrusion 120 and the plurality of tabs 200, thereby ensuring stable connection between the tabs 200 and the connection member 100.
For the battery according to the embodiments of the present disclosure, by applying the connection member 100 according to the above embodiments to the battery, the assembly difficulty of the battery is lowered, and the manufacturing time of the battery is shortened. In addition, the labor cost is lowered, and the reliability of the battery is ensured.
In an embodiment of the present disclosure, as shown in
Here, as shown in
In some embodiments, the high-frequency vibration is a vibration generated by an ultrasonic welding. The ultrasonic welding replaces the traditional welding/adhesion process due to its rapid welding speed, high welding strength and good sealing performance. Further, the ultrasonic welding is low in cost, is clean without pollution and cannot damage a soft connection sheet and the tabs 200. In addition, the welding process is stable, and the electrical conductivity is good after welding, thereby a resistance coefficient is very low or is close to zero. Also, the ultrasonic welding is short in welding time, does not require any soldering flux, gas and solder, and does not generate sparks in the welding process and is environmentally friendly and safe.
In some embodiments, a welding pressure of the ultrasonic welding is not less than 20 N, and the welding time is not less 30 ms.
In an embodiment of the present disclosure, the electrode plate may include a support insulation layer 210, a first conductive layer 220 and a second conductive layer 230. The first conductive layer 220 and the second conductive layer 230 cover the two side surfaces of the support insulation layer 210 in a thickness direction of the support insulation layer 210, respectively. Referring to
In an embodiment, the support insulation layer 210 is a composite polymeric insulation layer.
A battery pack according to embodiments of the present disclosure includes the battery according to the above embodiments.
For the battery pack according to the embodiments of the present disclosure, by providing the battery as described above, safety performance of the battery pack is improved, and reliability of the battery pack is ensured, thereby avoiding dangers from occurring.
A battery according to an embodiment of the present disclosure will be described with reference to
Referring to
For the connection member 100 according to the embodiments of the present disclosure, by forming at least one end of the protrusion 120 in the length direction as the tip in the plane perpendicular to the thickness direction of the connection plate, the resistance of the tab 200 to the connection sheet is weakened, so that the force exerted on the tab 200 by the connection sheet is concentrated, thereby preventing the current flowing channel from being narrowed due to the lateral cracking of the tab 200.
In description of the present disclosure, it should be understood that orientations or positional relationships indicated by terms “center,” “longitudinal,” “transverse,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “anticlockwise,” “axial,” “radial,” “circumferential” and the like are based on orientations or positional relationships shown in the drawings, and facilitate the description of the present disclosure and simplify the description merely, rather than indicating or implying that the associated apparatus or element must have specific orientations and are constructed and operated in the specific orientations, and thus should not be construed to limit the present disclosure.
Moreover, the terms “first” and “second” are used only for description and shall not be interpreted as an indication or implication of relative importance or an implicit indication of the number of technical features. Thus, features associated with “first” and “second” may include at least one or more such features, either explicitly or implicitly. In the description of the present disclosure, “a plurality of” means two or more, unless otherwise specifically defined.
In the present disclosure, unless otherwise specifically stated and defined, terms “mounted”, “coupled”, “connected”, “fixed” and the like should be understood broadly. For example, it may be a fixed connection or detachable connection or integrally formed; it may be a mechanical connection, an electric connection, or a communication; it may be a direct connection, an indirect connection through an intermediary, or a communication between the interiors of two elements or mutual acting relationship between the two elements. The specific meanings of the above terms in the present disclosure may be understood by those of ordinary skill in the art as desired.
In descriptions of this specification, descriptions in the reference terms “an embodiment”, “some embodiments”, “example”, “specific example”, “some examples” or the like mean that the specific features, structures, materials or characteristics described in combination with the embodiments or the examples are included in at least one embodiment or example of the present disclosure. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable mode. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined by those skilled in the art without contradicting each other.
While the embodiments of the present disclosure have been illustrated and described, it should be understood to those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiment without departing from the principle and the spirit of the present disclosure, and the scope of the present disclosure is defined by the appended claims and equivalents thereof.
Number | Date | Country | Kind |
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202122354603.X | Sep 2021 | CN | national |