Battery cell cover plate
By specifically limiting the size of the battery cell cover plate components, the problem of unreasonable cover plate design is solved, performance and safety are improved, scrap rate and production costs are reduced, and the manufacturing quality of the battery cell is improved.
Patent Information
- Application Number
- CN202420273334.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-04
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-02-04
AI Technical Summary
The design size of the battery cell cover plate is unclear, resulting in unreasonable structural design, poor production feasibility, and structural strength and insulation do not meet the requirements, which affects the safety and production cost of the battery cell.
By specifically limiting the size of parts such as pole columns, connecting blocks and seals, the bearing capacity and sealing of pole columns are ensured, the performance and safety of the cover plate are improved, and the scrap rate is reduced.
It improves the performance and safety of the battery cell cover, reduces the production scrap rate, improves the manufacturing yield and insulation of the battery cell, and reduces production costs.
Smart Images
Figure CN222355385U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of secondary batteries, in particular to a battery core cover. Background Art
[0002] The cell cover is an important part of the battery assembly. It not only protects the cell from the external environment, but also prevents liquid leakage inside the cell. In addition, the cell cover also has a conductive function, which can transfer electrical energy during the operation of the cell to ensure the normal operation of the cell.
[0003] At present, the assembly design dimension requirements of various components of the battery cell cover are not clear, which may easily lead to unreasonable cover structure design, poor production feasibility of the battery cell cover, and structural strength and insulation that do not meet the requirements, affecting the production yield, and then affecting the safety of the battery cell, greatly increasing the production cost and scrap rate. Utility Model Content
[0004] In view of this, the utility model provides a cover plate to solve the problems of poor performance of the battery cover plate and high production scrap rate.
[0005] In the first aspect, the utility model provides a battery cell cover, comprising: a cover body, the cover body being provided with a first through hole; a connecting block, arranged above the cover body, and being provided with a second through hole; a pole, the pole passing through the first through hole and the second through hole, the pole comprising a connecting portion and a first column, the first column being connected to the connecting portion and arranged below the connecting portion, the edge of the connecting portion extending outwardly from the edge of the first column, the dimension from the edge of the first column to the edge of the connecting portion is e, satisfying e≥0.5mm.
[0006] Beneficial effect: By limiting the size from the edge of the first column to the edge of the connecting part, the load-bearing requirements of the pole are met while ensuring the overlap requirements of the pole and the connecting block, thereby improving the performance of the battery cover, reducing the scrap rate, and improving the safety of the battery.
[0007] In an optional embodiment, the pole further includes a second column, the first column is connected to the second column, the second column is connected to the cover plate body, the diameter of the first column is a, the diameter of the second column is b, and a≤b is satisfied.
[0008] Beneficial effect: By limiting the diameter of the second cylinder to be greater than or equal to the diameter of the first cylinder, the current capacity of the pole is guaranteed.
[0009] In an optional embodiment, the diameter b of the second cylinder is ≥ 6 mm.
[0010] In an optional embodiment, the battery cell cover plate further includes a seal, and the seal is disposed between the second column and the cover plate body.
[0011] Beneficial effect: By providing the sealing member, the sealing performance between the pole and the cover plate body is improved.
[0012] In an optional embodiment, the pole further includes a third column, the third column is connected to the second column, the third column is connected to the seal, and a dimension d from an outer edge of the third column to an outer edge of the seal is ≥ 0.7 mm.
[0013] Beneficial effect: By limiting the size from the outer edge of the third column to the outer edge of the sealing member, the sealing reliability of the sealing member after compression is ensured.
[0014] In an optional embodiment, the seal includes a first sealing section and a second sealing section, the second sealing section is connected to the outer periphery of the first sealing section, the first sealing section is arranged between the second column and the cover body, the second sealing section is arranged between the third column and the cover body, and the dimension c from the outer edge of the second sealing section to the inner edge of the first sealing section is ≥1.6mm, and d / c ≥0.4.
[0015] Beneficial effect: By limiting the size from the outer edge of the second sealing section to the inner edge of the first sealing section, the compression amount of the seal is ensured, thereby preventing air leakage inside the battery cover.
[0016] In an optional embodiment, the connecting block includes a first connecting section and a second connecting section, the first connecting section is connected to the second connecting section, the first connecting section is connected to the connecting section, the second connecting section is connected to the first column, and the dimension f from the outer edge of the first connecting section to the inner edge of the first connecting section is ≥2mm.
[0017] Beneficial effect: By limiting the size from the outer edge of the first connection section to the inner edge of the first connection section, the structural strength of the connection block itself is ensured while ensuring the bonding strength of the cell cover plate when it is welded to the battery module in the next process.
[0018] In an optional embodiment, the cover plate body includes a first cover plate section and a second cover plate section, the first cover plate section is connected to the second cover plate section and is arranged on the inner side of the second cover plate section, the first cover plate section is connected to the sealing member, and the dimension g from the outer edge of the second cover plate section to the inner edge of the second cover plate section is ≥2.5mm.
[0019] Beneficial effect: By limiting the size from the outer edge of the second cover plate section to the inner edge of the second cover plate section, the structural strength of the cover plate body is ensured while preventing the blue film of the cell cover plate from warping when the blue film is pasted in the next process.
[0020] In an optional embodiment, the cell cover further includes an insulating member, wherein the insulating member is disposed below the cover body and abuts against the cover body.
[0021] In an optional implementation, a dimension from an outer edge of the insulating member to an outer edge of the second cover plate section is h, satisfying 0.6 mm ≤ h ≤ 2 mm.
[0022] Beneficial effect: while ensuring the insulation of the battery, it is ensured that the cell cover can smoothly enter the battery shell, avoiding interference between the cell cover and the bent part of the electrode group. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 This is a schematic cross-sectional view of the structure of a battery cover plate according to an embodiment of the utility model;
[0025] Figure 2 It is a schematic cross-sectional view of the structure of the sealing member of an embodiment of the utility model;
[0026] Figure 3 The figure is a schematic cross-sectional view of the structure of the pole according to the embodiment of the utility model.
[0027] Description of reference numerals:
[0028] 10. Cover plate body; 11. First cover plate section; 12. Second cover plate section; 20. Connection block; 21. First connection section; 22. Second connection section; 30. Pole; 31. First column; 32. Second column; 33. Third column; 34. Connection part; 40. Sealing element; 41. First sealing section; 42. Second sealing section; 50. Insulating element; 60. Upper plastic. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.
[0030] Combine the following Figure 1 and Figure 3 , describing an embodiment of the utility model.
[0031] According to an embodiment of the utility model, on the one hand, a cell cover is provided, including a cover body 10, a connection block 20, and a pole 30. The cover body 10 is provided with a first through hole; the connection block 20 is arranged above the cover body 10 and is provided with a second through hole; the pole 30 passes through the first through hole and the second through hole, and the pole includes a connecting portion 34 and a first column 31, the first column 31 is connected to the connecting portion 34 and is arranged below the connecting portion 34, the edge of the connecting portion 34 extends outwardly from the edge of the first column 31, and the dimension from the edge of the first column 31 to the edge of the connecting portion 34 is e, satisfying e≥0.5mm.
[0032] By applying the battery cell cover of this embodiment, by limiting the size from the edge of the first column 31 to the edge of the connecting portion 34, the load-bearing requirements of the pole 30 are met while ensuring the overlap requirements between the pole 30 and the connecting block 20, thereby improving the performance of the battery cell cover, reducing the scrap rate, and improving the safety of the battery cell.
[0033] Specifically, the pole 30 is connected to the connection block 20 by riveting.
[0034] Specifically, in this embodiment, the cover body 10 is a plain aluminum sheet.
[0035] Of course, in other alternative implementations, the cover body 10 may also be made of other materials.
[0036] In one embodiment, Figure 3 As shown, the pole 30 further includes a second column 32, the first column 31 is connected to the second column 32, the second column 32 is connected to the cover body 10, the diameter of the first column 31 is a, the diameter of the second column 32 is b, and a≤b is satisfied.
[0037] For details, please refer to Figure 1 , the diameter of the connecting portion 34 is y, satisfying e=(ya) / 2, e≥0.5mm.
[0038] It is worth noting that by limiting the diameter of the second column 32 to be greater than or equal to the diameter of the first column 31 , the current capacity of the pole 30 is guaranteed.
[0039] In one embodiment, the diameter b of the second cylinder 32 is ≥ 6 mm.
[0040] It should be noted that the second column 32 can be formed in one piece using pure aluminum.
[0041] Of course, in other alternative implementations, the second column 32 can also be provided by copper and aluminum separately, and the copper and aluminum are connected by stir friction welding.
[0042] It should be noted that, in order to ensure the bonding reliability of the friction stir welding, a minimum limit is imposed on the diameter of the second column 32 to satisfy the diameter b of the second column 32 ≥ 6 mm.
[0043] In one embodiment, Figure 1 As shown, the cell cover further includes a seal 40 , which is disposed between the second column 32 and the cover body 10 .
[0044] Specifically, the sealing member 40 in this embodiment is a sealing ring.
[0045] It is worth noting that the sealing performance between the pole 30 and the cover body 10 is improved by providing the sealing member 40 .
[0046] In one embodiment, Figure 1 and 3 As shown, the pole 30 further includes a third column 33 , which is connected to the second column 32 , and to the seal 40 , and a dimension d from the outer edge of the third column 33 to the outer edge of the seal 40 is ≥0.7 mm.
[0047] It is worth noting that by limiting the size from the outer edge of the third column 33 to the outer edge of the sealing member 40 , the sealing reliability of the sealing member 40 after compression is ensured.
[0048] In one embodiment, Figure 2 As shown, the seal 40 includes a first sealing section 41 and a second sealing section 42. The second sealing section 42 is connected to the outer periphery of the first sealing section 41. The first sealing section 41 is arranged between the second column 32 and the cover body 10, and the second sealing section 42 is arranged between the third column 33 and the cover body 10. The dimension c from the outer edge of the second sealing section 42 to the inner edge of the first sealing section 41 is ≥1.6mm, and d / c ≥0.4.
[0049] Specifically, the first sealing section 41 and the second sealing section 42 are integrally formed.
[0050] Specifically, the first sealing section 41 is compressed and arranged between the lower surface of the connecting block 20 and the upper surface of the third column 33, and is subjected to vertical pressure from the connecting block 20 and the third column 33; the second sealing section 42 is compressed and arranged between the lower surface of the cover body 10 and the upper surface of the third column 33, and is subjected to vertical pressure from the cover body 10 and the third column 33.
[0051] It is worth noting that by limiting the size from the outer edge of the second sealing section 42 to the inner edge of the first sealing section 41 , the compression amount of the sealing member 40 is ensured, thereby preventing air leakage inside the cell cover.
[0052] In one embodiment, Figure 1 As shown, the connecting block 20 includes a first connecting section 21 and a second connecting section 22, the first connecting section 21 is connected to the second connecting section 22, the first connecting section 21 is connected to the connecting section 34, the second connecting section 22 is connected to the first column 31, and the dimension f from the outer edge of the first connecting section 21 to the inner edge of the first connecting section 21 is ≥ 2 mm.
[0053] It should be noted that if the dimension from the outer edge of the first connecting section 21 to the inner edge of the first connecting section 21 is too small, the structural strength of the connecting block 20 itself will be too low.
[0054] It should be noted that during the battery assembly process, the connecting block 20 needs to be welded to the battery module in the next process. If the size from the outer edge of the first connecting section 21 to the inner edge of the first connecting section 21 is too small, the welding strength will be reduced, affecting the performance of the battery.
[0055] It is worth noting that by limiting the size from the outer edge of the first connection section 21 to the inner edge of the first connection section 21, the structural strength of the connection block 20 itself is ensured while the bonding strength of the cell cover plate when welded to the battery module in the next process is guaranteed.
[0056] Please note that Figure 1 , the overall width of the connecting block 20 is x=2f+y=2f+2e+a.
[0057] In one embodiment, Figure 1 As shown, the cover body 10 includes a first cover section 11 and a second cover section 12, the first cover section 11 is connected to the second cover section 12 and is arranged on the inner side of the second cover section 12, the first cover section 11 is connected to the seal 40, and the dimension g from the outer edge of the second cover section 12 to the inner edge of the second cover section 12 is ≥2.5mm.
[0058] It is worth noting that by limiting the size from the outer edge of the second cover plate section 12 to the inner edge of the second cover plate section 12, while ensuring the structural strength of the cover plate body 10, the blue film of the battery cell cover plate is prevented from warping when the blue film is pasted in the next process.
[0059] In one embodiment, Figure 1 As shown, the cell cover further includes an insulating member 50 , which is disposed below the cover body 10 , and the insulating member 50 abuts against the cover body 10 .
[0060] Specifically, the insulating member 50 in this embodiment is lower plastic.
[0061] In one embodiment, the dimension from the outer edge of the insulating member 50 to the outer edge of the second cover plate section 12 is h, which satisfies 0.6 mm≤h≤2 mm.
[0062] It should be noted that errors may occur in the battery production process. When the inner groove size of the battery shell is slightly smaller than the standard size, if the size from the outer edge of the insulating part 50 to the outer edge of the second cover plate section 12 is too small, the battery cell cover will interfere with the battery shell during assembly with the battery shell. Therefore, a lower limit is set for the size from the outer edge of the insulating part 50 to the outer edge of the second cover plate section 12 to satisfy the size h ≥ 0.6mm.
[0063] It should be noted that if the dimension from the outer edge of the insulating part 50 to the outer edge of the second cover plate section 12 is too large, a large gap will be generated after the battery cell cover and the battery case are assembled, affecting the overall insulation of the battery. Therefore, an upper limit is set for the dimension from the outer edge of the insulating part 50 to the outer edge of the second cover plate section 12 to satisfy the dimension h≤2mm.
[0064] It is worth noting that while ensuring the insulation of the battery, it is also necessary to ensure that the cell cover can smoothly enter the battery casing to avoid interference between the cell cover and the bent portion of the electrode group.
[0065] In one embodiment, Figure 1 As shown, the cell cover further includes an upper plastic 60 , and the upper plastic 60 is disposed between the cover body 10 and the connecting block 20 .
[0066] Specifically, the first sealing portion 41 is compressed and disposed between the lower surface of the upper plastic 60 and the upper surface of the third column 33 , and is subjected to vertical pressure from the upper plastic 60 and the third column 33 .
[0067] By applying the battery cell cover plate of this embodiment, the assembly dimensions of each component of the battery cell cover plate are controlled, and at the same time, the reliability of the design dimensions and production feasibility of the battery cell cover plate are ensured, while the insulation and stress safety of the battery cell cover plate are improved, thereby effectively improving the battery cell production yield and reducing the battery cell production cost.
[0068] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.
Claims
1. A battery cell cover, characterized in that: include: A cover plate body, wherein the cover plate body is provided with a first through hole; A connecting block is arranged above the cover body and has a second through hole; A pole, wherein the pole passes through the first through-hole and the second through-hole, and comprises a connecting portion and a first column, wherein the first column is connected to the connecting portion and is arranged below the connecting portion, and an edge of the connecting portion extends outwardly from an edge of the first column, and a dimension from an edge of the first column to an edge of the connecting portion is e, satisfying e≥0.5 mm.
2. The cell cover plate according to claim 1, characterized in that: The pole also includes a second column, the first column is connected to the second column, the second column is connected to the cover plate body, the diameter of the first column is a, the diameter of the second column is b, and a≤b is satisfied.
3. The cell cover plate according to claim 2, characterized in that: The diameter b of the second column is ≥6 mm.
4. The cell cover plate according to claim 2 or 3, characterized in that: The cell cover plate further includes a seal, which is disposed between the second column and the cover plate body.
5. The cell cover plate according to claim 4, characterized in that: The pole further includes a third column, the third column is connected to the second column, the third column is connected to the seal, and a dimension d from an outer edge of the third column to an outer edge of the seal is ≥0.7 mm.
6. The cell cover plate according to claim 5, characterized in that: The seal includes a first sealing section and a second sealing section, the second sealing section is connected to the outer periphery of the first sealing section, the first sealing section is arranged between the second column and the cover body, the second sealing section is arranged between the third column and the cover body, and the dimension c from the outer edge of the second sealing section to the inner edge of the first sealing section is ≥1.6mm, and d / c is ≥0.
4.
7. The cell cover plate according to any one of claims 1 to 3, characterized in that: The connecting block includes a first connecting section and a second connecting section, the first connecting section is connected to the second connecting section, the first connecting section is connected to the connecting section, the second connecting section is connected to the first column, and a dimension f from an outer edge of the first connecting section to an inner edge of the first connecting section is ≥2mm.
8. The cell cover plate according to claim 4, characterized in that: The cover plate body includes a first cover plate section and a second cover plate section, the first cover plate section is connected to the second cover plate section and is arranged on the inner side of the second cover plate section, the first cover plate section is connected to the sealing member, and a dimension g from the outer edge of the second cover plate section to the inner edge of the second cover plate section is ≥2.5 mm.
9. The cell cover plate according to claim 8, characterized in that: The cell cover plate further comprises an insulating member, which is disposed below the cover plate body and abuts against the cover plate body.
10. The battery cell cover plate according to claim 9, characterized in that: A dimension from an outer edge of the insulating member to an outer edge of the second cover plate section is h, which satisfies 0.6 mm ≤ h ≤ 2 mm.