Compressible manifold
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WANXIANG 123 CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-03
Smart Images
Figure CN224458497U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to a compressible current collector. Background Technology
[0002] Cylindrical batteries are a widely used type of rechargeable battery. In cylindrical batteries, the cells are electrically connected to the top cover via current collectors. Specifically, the tabs and current collectors are fixed using ultrasonic welding, while the current collectors and top cover are fixed using laser welding. Current collectors are divided into positive and negative current collectors. During installation, the positive tab of the cell is welded to the casing via the positive current collector, and the negative tab is welded to the top cover via the negative current collector. However, considering dimensional errors in actual production, the height of different cells is not entirely consistent. To avoid the negative current collector being unable to accommodate cells of different heights, resulting in excessively large cells and preventing the top cover from sealing properly, a compression structure is usually designed for the negative current collector. Chinese patent CN202222044275.8 discloses a cylindrical battery top cover and cell structure, including an upper bus, a lower bus, and a spring bus. The bottom surface of the lower bus rests on the cell. The spring bus is fixed on the lower bus and the upper bus is fixed on the spring bus. The top surface of the upper bus rests on the terminal post. In this design, the spring bus requires two buses, an upper bus and a lower bus, to support it. Furthermore, the spring bus, the upper bus, and the lower bus are all separate components that need to be integrated and assembled, which is quite complicated. Utility Model Content
[0003] To address the cumbersome assembly of spring busbars, upper busbars, and lower busbars in existing technologies, this invention proposes a compressible current collector plate. The plate body and the deformable component are integrated into one structure, allowing the current collector plate to self-deform during penetration welding after assembly, ensuring close contact between the battery cell and the current collector plate, and reducing the assembly process.
[0004] The technical solution adopted by this utility model is as follows: a compressible manifold includes a disc body and a deformable component coaxially arranged with the disc body. The deformable component includes a first deformable part, a second deformable part, and a third deformable part that are connected in sequence by bending at an angle. The end of the third deformable part away from the second deformable part is integrally connected to the disc body. The end of the first deformable part away from the second deformable part is provided with a connector for welding to a cover plate.
[0005] Optionally, the angle between the first deformed part and the second deformed part is the first angle, and the angle between the second deformed part and the third deformed part is the second angle. The first angle is located on one side of the second deformed part, and the second angle is located on the other side of the second deformed part.
[0006] Optionally, the thickness of the third deformed portion near the end of the second deformed portion is less than the thickness of the third deformed portion near the end of the disk body.
[0007] Optionally, the inner peripheral wall of the connector is provided with an annular protrusion for engaging with the cover plate.
[0008] Optionally, the angle of the first included angle is 0~90°, and the angle of the second included angle is 0~90°.
[0009] Optionally, the disc body is provided with a plurality of strip grooves at circumferential intervals for connecting with the electrode tabs.
[0010] Optionally, the disc body is provided with a plurality of support protrusions spaced apart along the axial direction.
[0011] Optionally, the strip grooves and the supporting protrusions are arranged in an alternating pattern, corresponding one-to-one.
[0012] The beneficial effects of this utility model are as follows: the disc body and the cell tabs can be welded in advance, and the connecting parts and the cover plate can be welded together. Under axial pressure, the cover plate is pressed down, causing the deformation component to deform. Before compression, the deformation component can provide a space of >4mm when welding the disc body and the cover plate around the electrode post, which can effectively solve the welding problem in this process. After compression, the overall height of the current collector can be <1mm, which not only avoids wasting internal space and improves the energy density of the battery, but also achieves large-area welding to ensure sufficient overcurrent capacity. The disc body and the deformation component are an integral structure, which allows the current collector to self-deform during penetration welding after assembly, ensuring close contact between the cell and the current collector. The integrated design reduces the assembly process. Among them, the end of the third deformation part away from the second included angle is thickened to ensure that this part does not deform and squeeze the cell during the compression of the current collector. The angle of the first included angle is 0~90°, and the angle of the second included angle is 0~90°. If the angles of the first included angle and the second included angle are too large, it will lead to excessive material deformation, resulting in cracking or uncontrolled deformation. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the compressible manifold proposed in an embodiment of the present invention;
[0014] Figure 2 This is a schematic diagram of the compressible manifold after compression according to an embodiment of the present invention;
[0015] Figure 3 This is a schematic diagram of the deformable component of the compressible manifold proposed in an embodiment of the present utility model;
[0016] Figure 4 This is a schematic diagram of the compressible manifold body proposed in an embodiment of the present invention.
[0017] The labels in the attached figures are as follows: 1. Disc body; 11. Strip groove; 12. Support protrusion; 2. Deformation component; 21. First deformation part; 22. Second deformation part; 23. Third deformation part; 24. Connector; 25. Ring protrusion; 3. Cover plate; 4. Battery cell. Detailed Implementation
[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.
[0019] like Figures 1 to 4 As shown, this embodiment discloses a compressible current collector, including a disk body 1 and a deformable component 2 coaxially arranged with the disk body 1. The deformable component 2 includes a first deformable part 21, a second deformable part 22, and a third deformable part 23 connected in sequence at an angle. The end of the third deformable part 23 away from the second deformable part 22 is integrally connected to the disk body 1. The end of the first deformable part 21 away from the second deformable part 22 is provided with a connector 24 for welding to a cover plate 3. With this configuration, the disk body 1 can be pre-welded to the electrode tabs of the battery cell 4, and the connector 24 can be welded to the cover plate 3. Under axial pressure, the cover plate 3 is pressed down, causing the deformable component 2 to deform. Before compression, the deformable component 2 can provide >4mm of space when welding the disk body 1 to the periphery of the cover plate electrode, which can effectively solve the welding problem in this process. After compression, the overall height of the current collector can be <1mm, which means that the internal space is not wasted, the battery energy density is improved, and large-area welding is achieved to ensure sufficient overcurrent capacity. The current collector 1 and the deformable component 2 are integrated into one structure, allowing the current collector to self-deform during penetration welding after assembly, ensuring tight contact between the battery cell 4 and the current collector. The integrated design reduces the assembly process. The current collector can be made of aluminum, copper, or nickel-plated copper.
[0020] In this embodiment, as Figure 1 As shown, the angle between the first deformable part 21 and the second deformable part 22 is the first included angle, and the angle between the second deformable part 22 and the third deformable part 23 is the second included angle. The first included angle is located on one side of the second deformable part 22, and the second included angle is located on the other side of the second deformable part 22. The thickness of the third deformable part 23 near the second deformable part 22 is less than the thickness of the third deformable part 23 near the disk body 1. The thickness around the first and second included angles is less than 0.6 mm to facilitate deformation. The end of the third deformable part 23 away from the second included angle is thickened. This setting ensures that the cell 4 is not deformed and squeezed during the compression of the current collector. The angles of the first and second included angles both vary between 0 and 90°. If the angles of the first and second included angles are too large, it will lead to excessive material deformation, resulting in cracking or uncontrolled deformation. The angles of the first and second included angles may be different.
[0021] like Figure 3As shown, the inner peripheral wall of the connector 24 is provided with an annular protrusion 25 for engaging with the cover plate 3. The annular protrusion 25 engages with the groove on the cover plate 3. This arrangement prevents the cover plate 3 from shaking and facilitates welding the connector 24 to the cover plate 3, avoiding damage to the weld joint due to stress. The annular protrusion 25 also serves to support the connector 24 and prevent deformation of the connector 24.
[0022] In this embodiment, as Figure 4 As shown, the disc body 1 has multiple circumferentially spaced slots 11 for connecting to the electrode tabs. The electrode tabs are connected to the slots 11 by welding or mechanical connection. The disc body 1 has multiple axially spaced support protrusions 12. The presence of the support protrusions 12 ensures the reliability of the fit between the disc body 1 and the cover plate 3. This arrangement also resists the pressure when the deformable part is deformed, protecting the battery cell 4. The slots 11 and the support protrusions 12 are arranged in a one-to-one staggered manner.
[0023] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.
Claims
1. A compressible busbar, characterized by, The device includes a disc body (1) and a deformable component (2) coaxially arranged with the disc body (1). The deformable component (2) includes a first deformable part (21), a second deformable part (22) and a third deformable part (23) connected in sequence by bending at an angle. The end of the third deformable part (23) away from the second deformable part (22) is integrally connected to the disc body (1). The end of the first deformable part (21) away from the second deformable part (22) is provided with a connector (24) for welding to the cover plate (3).
2. The compressible bus bar of claim 1, wherein, The angle between the first deformable part (21) and the second deformable part (22) is the first angle, and the angle between the second deformable part (22) and the third deformable part (23) is the second angle. The first angle is located on one side of the second deformable part (22), and the second angle is located on the other side of the second deformable part (22).
3. The compressible bus bar of claim 1, wherein, The thickness of the third deformation part (23) near the end of the second deformation part (22) is less than the thickness of the third deformation part (23) near the end of the disk body (1).
4. The compressible bus bar of claim 1, wherein, The inner peripheral wall of the connector (24) is provided with an annular protrusion (25) for cooperating with the cover plate (3).
5. The compressible bus bar of claim 2, wherein, The angle of the first included angle is 0~90°, and the angle of the second included angle is 0~90°.
6. The compressible manifold according to claim 1, characterized in that, The disc (1) is provided with a plurality of strip grooves (11) spaced apart along the circumference for connecting with the electrode tabs.
7. The compressible bus bar of claim 6, wherein, The disc body (1) is provided with a plurality of support protrusions (12) spaced apart along the axial direction.
8. The compressible bus bar of claim 7, wherein, The strip groove (11) and the supporting protrusion (12) are arranged alternately in a one-to-one correspondence.