Patent Grant
12136748
This application claims priority to Chinese Application No. 202310090143.5, filed on Feb. 9, 2023, which is incorporated herein by reference in its entirety.
The present disclosure relates to the field of battery technology, specifically to an energy storage device and an electrical equipment.
In the related arts, a battery typically includes a housing and an electrode assembly provided within the housing. The electrode assembly includes a jellyroll, a connecting sheet and a tab connected to an end of the jellyroll. The tab and the connecting sheet are usually fixed by ultrasonic welding. Generally, all overlapping areas between the tab and the connecting sheet are welded during welding, so that debris is adhered to edges of the overlapping areas. During the battery charging and discharging process, debris tends to fall off, which may cause a short circuit between positive and negative electrodes, and lead to a serious safety hazard.
An object of the present disclosure is to provide an energy storage device and an electrical equipment with improved safety performance.
In order to achieve the above object, the present disclosure provides the following technical solutions.
According to an aspect of the present disclosure, an energy storage device is provided. The energy storage device includes a housing, a jellyroll, a connecting sheet, and a top cover. The jellyroll and the connecting sheet are received within the housing, and the top cover seals the housing.
The jellyroll is provided with a tab, and the connecting sheet includes a body part and a side wing part.
The energy storage device further includes a welding structure. The welding structure is composed of the tab and the side wing part, and the welding structure is formed by welding.
The tab includes a plurality of tab sheets, in which a tab sheet farthest from the side wing part is a first tab sheet. The welding structure forms a welding area on the first tab sheet.
An area of the welding area is S1, an area of the side wing part is S2, and a projection area of the first tab sheet on a plane where the side wing part is located is S3, wherein:
In the embodiment of the present disclosure, after the side wing part of the connecting sheet is attached to the tab, selecting an appropriate area proportion of the welding area can greatly reduce the generation of debris while ensuring the welding strength, thereby reducing the safety hazards of the energy storage device. In addition, using a welding structure composed of the connecting sheet and the tab can avoid from using a protective sheet and thus reduce the cost, remove a procedure of placing the protective sheet, prevent the protective sheet from scratching the tab which may cause the product to be scrapped when the protective sheet is being placed, and greatly improve the welding efficiency.
According to an embodiment of the present disclosure, the welding area includes a fixing welding area and a guiding welding area, wherein the fixing welding area and the guiding welding area are distributed along a length direction of the side wing part.
A distance between the fixing welding area and the guiding welding area is d1, and a size of the fixing welding area in the length direction of the side wing part is d2, wherein d1/d2≤1.5.
In the embodiment of the present disclosure, the fixing welding area and the guiding welding area are provided with a gap between the fixing welding area and the guiding welding area defined, so that the tab and the side wing part may be welded by separate regions (i.e., there are separate welding regions between the tab and the side wing part). The deformation of the tab in the fixing welding area and the guiding welding area can be alleviated by the gap, so as to reduce the deformation amount per unit length during welding of the tab in the length direction of the side wing part and reduce the risk of tearing of the tab.
According to an embodiment of the present disclosure, the side wing part is welded with the tab to form several first welding spots located in the fixing welding area, and several second welding spots located in the guiding welding area.
A gap between the fixing welding area and the guiding welding area is less than a size of the first or second welding spot in the length direction of the side wing part.
In the embodiment of the present disclosure, the distance between the fixing welding area and the guiding welding area is shortened to increase the welding area of the tab and the connecting sheet, thereby further ensuring the welding strength and ensuring the flow guiding effect between the tab and the connecting sheet.
According to an embodiment of the present disclosure, a welding mark area of the first welding spots is smaller than or equal to a welding mark area of the second welding spots.
In the embodiment of the present disclosure, when welding in the fixing welding area, the size of the first welding spot is reduced, thereby reducing the deformation amount of the tab during welding, and reducing the risk of tab tearing during welding. Meanwhile, when welding in the guiding welding area, the size of the second welding spot is increased, thereby ensuring a sufficient contact area between the tab and the side wing part in the guiding welding area, and ensuring the flow guiding effect between the tab and the connecting sheet.
According to an embodiment of the present disclosure, there is an overlapping area between the side wing part and the first tab sheet in a thickness direction of the side wing part.
An area of the fixing welding area is S11, an area of the overlapping area is S4, and a distance between an edge of the fixing welding area and an edge of the overlapping area is L1, wherein 5%≤S11/S4≤25%; and 1 mm≤L1≤3 mm.
In the embodiment of the present disclosure, the area of the fixing welding area and edges of the fixing welding area and the side wing part are defined, so as to increase a fixing area of the tab and the connecting sheet in the length direction and a width direction of the side wing part, thereby ensuring the welding stability of the tab and the connecting sheet while effectively reducing the risk of tab tearing.
According to an embodiment of the present disclosure, there is an overlapping area between the side wing part and the first tab sheet in the thickness direction of the side wing part.
An area of the guiding welding area is S12, and an area of the overlapping area is S4, and a distance between an edge of the guiding welding area and an edge of the overlapping area is L2, wherein 10%≤S12/S4≤90%; and 1 mm≤L2≤3 mm.
In the embodiment of the present disclosure, the area of the guiding welding area and edges of the guiding welding area and the side wing part are defined, so as to increase the flow guiding area of the tab and the connecting sheet in the width direction of the side wing, thereby effectively reducing the risk of tab tearing while ensuring a sufficient contact area between the tab and the connecting sheet, and thus ensuring the flow guiding effect between the tab and the connecting sheet.
According to an embodiment of the present disclosure, the plurality of tab sheets are welded with the side wing part to form several first welding spots, and the first welding spots are located in the fixing welding area.
A distance between two adjacent first welding spots is L11, and a size of the first welding spot in a layout direction of the two adjacent first welding spots is L12, wherein L11<L12.
In the embodiment of the present disclosure, a density of the first welding spots in the fixing welding area is adjusted so as to ensure the stability of welding when the tab and the connecting sheet are fixedly welded.
According to an embodiment of the present disclosure, L11/L12>10%.
In the embodiment of the present disclosure, a minimum distance between the two adjacent first welding spots in the fixing welding area is defined to reduce the risk of tab tearing between the adjacent first welding spots.
According to an embodiment of the present disclosure, the plurality of tab sheets are welded with the side wing part to form several second welding spots, and the second welding spots are located in the guiding welding area.
A distance between two adjacent second welding spots is L21, and a size of the second welding spot in a layout direction of the two adjacent second welding spots is L22, wherein L21<L22.
In the embodiment of the present disclosure, a density of the second welding spots in the guiding welding area is adjusted so as to ensure the flowing effect between the tab and the connecting sheet.
According to an embodiment of the present disclosure, L21/L22>10%.
In the embodiment of the present disclosure, a minimum distance between the two adjacent second welding spots in the guiding welding area is defined to reduce the risk of tab tearing between the adjacent second welding spots.
According to an embodiment of the present disclosure, a plurality of welding areas include two fixing welding areas located on both sides of the guiding welding area along the length direction of the side wing part.
In the embodiment of the present disclosure, two fixing welding areas are fixedly welded at both ends thereof in the length direction of the side wing part, thereby further ensuring the stability of the relative position between the tab and the connecting sheet before the flow guiding welding. In addition, the welding area is divided into three partition areas, further increasing a distribution range of the three partition areas, increasing the overall fixing area between the tab and the connecting sheet, improving the stability of connection between the tab and the connecting sheet, and increasing the overall flow guiding area of the tab and the connecting sheet.
According to an embodiment of the present disclosure, two fixing welding areas are symmetrically distributed with respect to the guiding welding area.
In the embodiment of the present disclosure, the guiding welding area is positioned and centered between the two fixing welding areas, ensuring the uniformity of flowing between the tab and the connecting sheet, and thereby ensuring the flow guiding effect of the tab and the connecting sheet.
According to an embodiment of the present disclosure, a thickness of the welding structure is H, wherein 1.8 mm≤H≤2.2 mm.
In the embodiment of the present disclosure, the thickness of the welding structure is defined, avoiding the risk that it is easy to be tore due to a thin welding structure, and thereby ensuring the flow guiding effect between the tab and the connecting sheet; and also avoiding a situation where a thick welding structure occupies a large space inside the housing so that the overall volume of the energy storage device is large.
According to an embodiment of the present disclosure, the welding area includes a plurality of welding spots, and a depth of the welding spot is S, wherein 1 mm≤S≤1.5 mm.
In the embodiment of the present disclosure, the depth of the welding spot in the welding area is defined to reduce a deformation area of the tab, that is, reduce the deformation amount of the tab, and reduce the risk of tab tearing; and also reduce the risk of unstable welding on the tab and the connecting sheet since the depth of the welding spot is small.
According to an aspect of the present disclosure, an electrical equipment is provided. The electrical equipment includes an energy storage device as described in the above aspect, and the energy storage device supplies power to the electrical equipment.
In the embodiment of the present disclosure, in combination with the energy storage device as mentioned above, when it is not necessary to provide the protective sheet (i.e., the arrangement of the protective sheet can be omitted), it is beneficial to reduce the weight of the energy storage device, thereby reducing the load on the electrical equipment and improving its performance.
It should be understood that the general description as mentioned above and the detailed description in the following contents are only illustrative and explanatory, and do not limit the present disclosure.
With reference to the accompanying drawings, the exemplary embodiments are described in detail, and the above and other features and advantages of the present disclosure will become more apparent.
The reference numbers are listed as follows:
The exemplary embodiments will now be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in multiple forms and should not be limited to the embodiments described herein; on the contrary, providing these embodiments makes the present disclosure comprehensive and complete, and fully conveys the concept of the exemplary embodiments to those skilled in the art. The same reference numbers in the figures represent the same or similar structures, and thus their detailed descriptions will be omitted.
An embodiment of the present disclosure provides an energy storage device, which may be, but is not limited to, a cell, a battery module, a battery pack, a battery system, etc. When the energy storage device is a cell, it may be a prismatic cell or a cylindrical cell. Next, a prismatic cell is taken as an example of the energy storage device to provide a detailed description of the energy storage device.
The tab 21 provided on the jellyroll 20 is composed of stacked tab sheets. As shown in
In the embodiment of the present disclosure, the welding area 50 is directly formed on the first tab sheet 22. That is, when the tab 21 is welded with the connecting sheet 30, it is not necessary to provide the protective sheet, thereby reducing the cost and preventing the protective sheet from scratching the tab 21, which may cause the cell to be scrapped when the protective sheet is placed. In addition, a procedure of placing the protective sheet is omitted to simplify the welding process of the tab 21 and the connecting sheet 30, and greatly improve the welding efficiency of the tab 21 and the connecting sheet 30.
As shown in
Optionally, as shown in
Optionally, an end surface of the jellyroll 20 faces towards the top cover 40, and the end facing towards the top cover 40 is provided with two tabs 21. Alternatively, a centerline of the end surface of the jellyroll 20 is parallel to a plane where the top cover 40 is located, and each of the two ends of the jellyroll 20 is provided with one tab 21.
Optionally, for the welding structure formed by welding the tab 21 and the side wing part 32 of the connecting sheet 30, a thickness of the welding structure is H, wherein 1.8 mm≤H≤2.2 mm. In this way, the thickness of the welding structure is defined, avoiding the risk that the connecting sheet 30 and the tab 21 may be easily tore due to a thin welding structure, thereby ensuring the stability of connection between the tab 21 and the connecting sheet 30 and the flow guiding effect. A situation where a thick welding structure occupies a larger space inside the housing 10 is avoided, so that the overall volume of the energy storage device is large.
The thickness of the welding structure refers to a thickness of the side wing part 32 of the connecting sheet 30 in the welding area 50, and a total thickness of the plurality of tab sheets. In this way, the thickness of the welding structure can be adjusted by changing the number of layers of the tab sheets and the thickness of the side wing part 32, so that the thickness H of the welding structure satisfies a relationship of 1.8 mm≤H≤2.2 mm.
Optionally, when the tab 21 and the side wing part 32 of the connecting sheet 30 are welded, a plurality of welding spots are formed in the welding area 50 on the first tab sheet 22, and a depth of the welding spot is S, i.e., 1 mm≤S≤1.5 mm. In this way, a maximum depth of the welding spot is defined to reduce the deformation area of the tab 21, that is, reduce the deformation amount of the tab 21, thereby reducing the risk of tearing of the tab 21. Meanwhile, a minimum depth of the welding spot is defined, ensuring the welding stability between the tab 21 and the side wing part 32 of the connecting sheet 30, and avoiding the risk that the tab 21 falls off the side wing part 32.
The plurality of welding spots within the welding area 50 may be distributed in an arbitrary manner, such as in an array of m×n, where m and n both are integers greater than or equal to 1, m is the number of welding spots in a length direction O1 of the side wing part 32, and n is the number of welding spots in a width direction O2 of the side wing part 32.
Optionally, the welding spot within the welding area 50 may be circular, rectangular, or rhombic, etc. For example, the welding spot is circular, the welding spot is square, or the welding spot is rhombic. Of course, the welding spot may also be elliptical, parallelogram, etc., depending on a shape of a welding head of an ultrasonic welding machine. The shapes of the welding spots according to the present disclosure are cross-sectional shapes of the welding spots respectively, that is, projection shapes of the welding spots in a thickness direction of the connecting sheet 30.
Optionally, welding mark areas of the welding spots within the welding area 50 may be the same or different. For example, each of the plurality of welding spots within the welding area 50 is circular with a diameter of 2 mm; or each of the welding spots is square with a side length of 2 mm; or each of the welding spots is rhombic with a side length of 3.5 mm.
Optionally, a distance between two adjacent welding spots within the welding area 50 is less than or equal to a size of the welding spot in a layout direction of the two adjacent welding spots. In this way, a distribution density of the welding spots within the welding area 50 is adjusted to ensure the stability of the welding between the tab 21 and the connecting sheet 30, while reducing the risk of tearing of the tab 21.
For example, when a circular welding spot with a diameter of 2 mm, the distance between two adjacent welding spots within the welding area 50 is less than 1 mm. When a square welding spot with a side length of 2 mm is taken as an example, the distance between two adjacent welding spots within the welding area 50 is less than 1 mm.
In some embodiments, as shown in
In the embodiment of the present disclosure, it is not necessary to provide the protective sheet. After the side wing part of the connecting sheet is attached to the tab, selecting an appropriate area proportion of the welding area can greatly reduce the generation of debris while ensuring the welding strength, thereby reducing the safety hazards of the energy storage device. In addition, selecting the appropriate area proportion of the welding area can also ensure the flow guiding effect between the tab and the side wing part of the connecting sheet, thereby ensuring the electrical performance of the energy storage device.
For the assembled cell 100, the first tab sheet 22 is usually in a bended state. That is, after the first tab sheet 22 is welded with the side wing part 32 of the connecting sheet 30, the first tab sheet 22 is bent along a bending line L as shown in
In the embodiment of the present disclosure, the welding area 50 may be a continuous area or separated areas spaced apart from each other.
In some embodiments, as shown in
In this way, the fixing welding area 51 and the guiding welding area 53 are provided so that the tab 21 and the side wing part 32 may be welded by separate regions, so as to reduce welding areas of separated areas between the tab 21 and the side wing part 32. Thus, the deformation amount per unit length during the welding of the tab 21 in the length direction O1 of the side wing part 32 is reduced, and thereby reducing the risk of tearing of the tab 21. In addition, the fixing welding area 51 and the guiding welding area 53 are separated, increasing the overall welding area 50 between the tab 21 and the connecting sheet 30, improving the stability of connection between the tab 21 and the connecting sheet 30, and increasing the overall flow guiding area between the tab 21 and the connecting sheet 30.
An area of the fixing welding area 51 is smaller than an area of the guiding welding area 53, so that a small area welding is provided in the fixing welding area 51 to achieve pre-fixation of the tab 21 and the connecting sheet 30. Then, a large area welding is provided in the guiding welding area 53 to ensure the flow guiding effect between the tab 21 and the connecting sheet 30, thereby reducing the risk of tearing of the tab 21 during welding.
For the welding of the tab 21 with the side wing part 32 of the connecting sheet 30, as shown in
The number of the first welding spots 52 and the number of the second welding spots 54 may be same or different. When the number of the first welding spots 52 is same as the number of the second welding spots 54, a welding mark area of the first welding spots 52 is smaller than a welding mark area of the second welding spots 54, so as to ensure that the area of the fixing welding area 51 is smaller than the area of the guiding welding area 53.
For example, the number of first welding spots 52 is different from the number of second welding spots 54. As shown in
The shape and distribution of the first welding spots 52 and the second welding spots 54 may refer to the shape and distribution of the welding spots as mentioned above, not limited in the embodiment of the present disclosure. The shape of the first welding spot 52 and the shape of the second welding spot 54 may be the same or different.
For example, the shape of the first welding spot 52 is same as that of the second welding spot 54. As shown in
The welding mark area of the first welding spot 52 and the second welding spot 54 may be equal or not equal. When the welding mark area of the first welding spot 52 and the welding mark area of the second welding spot 54 are equal, the number of the first welding spots 52 is less than the number of the second welding spots 54 to ensure that the area of the fixing welding area 51 is smaller than the area of the guiding welding area 53. When the welding mark area of the first welding spots 52 is smaller than that of the second welding spots 54, the size of the first welding spot 52 is reduced when welding in the fixing welding area 51, thereby reducing the deformation amount of the tab 21 during welding, and reducing the risk of tearing of the tab 21 during welding in the fixing welding area 51. Meanwhile, the size of the second welding spot 54 is increased when welding in the guiding welding area 53 to ensure that the tab 21 and the side wing part 32 have sufficient contact area in the guiding welding area 53, thereby ensuring the flow guiding effect between the tab 21 and the connecting sheet 30.
For example, the welding mark area of the first welding spot 52 is equal to the welding mark area of the second welding spot 54. As shown in
In some embodiments, as shown in
Furthermore, as shown in
In some embodiments, as shown in
Furthermore, as shown in
In some embodiments, as shown in
Optionally, two fixing welding areas 51 are symmetrically distributed with respect to the guiding welding area 53, that is, distances between the two fixing welding areas 51 and the guiding welding area 53 are equal. In this way, the overall uniformity of the flow guiding in the flow guiding area between the tab 21 and the connecting sheet 30 can be ensured, thereby ensuring the flow guiding effect between the tab 21 and the connecting sheet 30.
In some embodiments, as shown in
Optionally, combined with the above-mentioned that the fixing welding area 51 includes the first welding spot 52, the guiding welding area 53 includes the second welding spot 54, the gap between the fixing welding area 51 and the guiding welding area 53 is less than the size of the first welding spot 52 or the second welding spot 54 in the length direction O1 of the side wing part 32. In this way, the distance between the fixing welding area 51 and the guiding welding area 53 is shortened to increase the welding area between the tab 21 and the connecting sheet 30, thereby further ensuring the welding strength and ensuring the flow guiding effect between the tab 21 and the connecting sheet 30.
In the embodiment of the present disclosure, there is an overlapping area between the side wing part 32 and the first tab sheet 22 in the thickness direction of the side wing part 32. In this way, when welding the tab 21 and the connecting sheet 30, the welding area 50 on the first tab sheet 22 is located within the overlapping area between the side wing part 32 and the first tab sheet 22. Combined with the above mentioned that the welding area 50 includes the fixing welding area 51 and the guiding welding area 53 as described above, as shown in
In some embodiments, for the fixing welding area 51, as shown in
In addition, as shown in
In some embodiments, for the guiding welding area 53, as shown in
In addition, as shown in
The embodiment of the present disclosure further provides an electrical equipment, which may be a vehicle, an energy storage container, etc. The electrical equipment includes the energy storage device as described in the above embodiments, which is used to supply power to the electrical equipment. In this way, in combination with the aforementioned energy storage device, the safety hazards of the energy storage device can be reduced, while the safety of using the electrical equipment is improved. When it is not necessary to provide the protective sheet, it is beneficial to reduce the weight of the energy storage device, thereby reducing the load on the electrical equipment and improving its performance.
In the embodiment of the present disclosure, the terms “first”, “second”, and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term “plurality” refers to two or more, unless otherwise specified. The terms “install”, “interconnect”, “connect”, “fix” and other terms should be understood in a broad sense. For example, “connect” may refer to a fixed connection, a detachable connection, or an integrated connection; “interconnect” may refer to direct interconnection or indirectly interconnection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood based on specific circumstances.
In the description of the embodiments of the present disclosure, it should be understood that the terms “above”, “under”, “left”, “right”, “front”, “back” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings, only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, It cannot be understood as a limitation on the embodiments.
In the description of the specification, the terms “one embodiment”, “some embodiments”, “specific embodiments”, etc. refer to the specific features, structures, materials, or features described in conjunction with the embodiment or example being included in at least one embodiment or example of the embodiment. In the specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or features described can be combined in an appropriate manner in any one or more embodiments or examples.
The above are only preferred embodiments of the present disclosure and are not intended to limit the application. For those skilled in the art, the embodiments may have various changes and variations. Any modifications, equivalents, improvements, etc. made within the spirit and principles of the embodiment shall be included within the scope of claims of the application.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310090143.5 | Feb 2023 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 11682813 | Lu | Jun 2023 | B1 |
| 20050048365 | Miyahisa | Mar 2005 | A1 |
| 20190329353 | Dai | Oct 2019 | A1 |
| 20210399269 | Peng | Dec 2021 | A1 |
| Number | Date | Country |
|---|---|---|
| 107104207 | Aug 2017 | CN |
| 209029470 | Jun 2019 | CN |
| 209786103 | Dec 2019 | CN |
| 210908609 | Jul 2020 | CN |
| 213483915 | Jun 2021 | CN |
| 113097656 | Jul 2021 | CN |
| 214518389 | Oct 2021 | CN |
| 114094289 | Feb 2022 | CN |
| 216413218 | Apr 2022 | CN |
| 114696045 | Jul 2022 | CN |
| 217848246 | Nov 2022 | CN |
| 115603004 | Jan 2023 | CN |
| 102019005152 | Jan 2021 | DE |
| 2017084653 | May 2017 | JP |
| 2019175688 | Oct 2019 | JP |
| 2018199439 | Nov 2018 | WO |
| Entry |
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| Battery connecting piece and tab welding structure by Li Yongjun et al. in (CN209029470-2019-06-25); English language machine translation—(Year: 2019). |
| Chinese Office Action dated Mar. 25, 2023 issued in CN 202310090143.5. |
| Notification of Grant Patent Right and Notice of Allowance dated Apr. 17, 2023 issued in CN 202310090143.5. |
| International Search Report dated Sep. 4, 2023 issued in PCT/CN2023/075220. |
| Number | Date | Country | |
|---|---|---|---|
| 20240274994 A1 | Aug 2024 | US |
