Battery cell pole assembly and battery cover body structure

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell pole column assembly and a battery cover body structure. The supporting piece is arranged around the periphery of the pole body, one side, close to the central area of the pole body, of the supporting piece and the outer side wall of the pole body are arranged at intervals, and a first accommodating space is formed; the insulating part comprises a first connecting part and a second connecting part, the first connecting part is filled in the first containing space, the second connecting part is arranged on the side, opposite to the first connecting part, of the supporting part, the first connecting part and the second connecting part jointly define a second containing space, and the supporting part is suitable for being contained in the second containing space. According to the battery cell pole component provided by the utility model, the pole body, the supporting piece and the insulating piece can be fixed to form an integral standardized pole module, so that the pole module can be conveniently assembled with a cover plate or a shell, the assembling efficiency of the pole is improved, and the production cost is favorably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a core pole column assembly and a battery cover structure. Background Art

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance and safety of lithium-ion batteries are increasing day by day.

[0003] In the existing lithium battery core, components such as positive and negative pole columns, riveting blocks, upper plastics, lower plastics, and sealing rings are all arranged on a light aluminum plate. In the manufacturing process, it is usually necessary to first assemble the positive and negative pole columns on the light aluminum plate, and set upper plastics, lower plastics, and sealing rings in the gaps between the positive and negative pole columns and the light aluminum plate, and then rivet and seal and fix components such as upper plastics, lower plastics, and sealing rings through riveting blocks to form the overall structure of the cover plate. However, the pole column assembly efficiency of this cover plate structure is relatively low. Summary of the Utility Model

[0004] In view of this, the utility model provides a core pole column assembly and a battery cover structure to solve the problem of relatively low pole column assembly efficiency of the cover plate structure of the lithium battery core.

[0005] In the first aspect, the utility model provides a core pole column assembly, including:

[0006] A pole column body;

[0007] A support member, arranged around the outer periphery of the pole column body, with a side of the support member close to the central area of the pole column body spaced from the outer side wall of the pole column body to form a first accommodation space;

[0008] An insulating member, including a first connection portion and a second connection portion. The first connection portion is filled in the first accommodation space, and the second connection portion is arranged on the opposite side of the support member and the first connection portion. The first connection portion and the second connection portion jointly enclose a second accommodation space, and the second accommodation space is adapted to accommodate the support member.

[0009] Beneficial effects: In the injection molding process of the core pole column assembly provided by the utility model, the first connection portion is filled and molded in the first accommodation space, thereby insulating and sealing between the pole column body and the support member, and realizing the relative fixation between the pole column body and the support member; the second connection portion is molded on the opposite side of the support member and the first connection portion, and the first connection portion and the second connection portion jointly wrap and fix the support member during the injection molding process, so that the pole column body, the support member, and the insulating member are fixed to form an integral standardized pole column module, which is convenient for assembly with the cover plate or the housing, thereby improving the pole column assembly efficiency and being beneficial to reducing production costs.

[0010] In an alternative embodiment, a third accommodation space is defined in the support member; the insulating member further includes a third connecting portion which is filled in the third accommodation space and is adapted to be connected to the first connecting portion and / or the second connecting portion.

[0011] Beneficial effect: Thereby restricting the relative displacement between the support member and the insulating member, which is conducive to improving the overall structural strength of the cell pole assembly.

[0012] In an alternative embodiment, the pole body includes a first stepped portion; the support member includes a first support portion which is disposed above the first stepped portion.

[0013] Beneficial effect: The first support portion is disposed on the first stepped portion so that the first support portion and the first stepped portion support and fix each other in the height direction, thereby improving the overall structural strength of the cell pole assembly.

[0014] In an alternative embodiment, the distance between one side of the first support portion close to the central region of the pole body and one side of the first stepped portion away from the central region of the pole body is E, and E satisfies 0.5 mm ≤ E ≤ 4 mm.

[0015] Beneficial effect: It can not only ensure the strength of the cell pole assembly, but also ensure a sufficient weldable surface area of the pole body, thereby ensuring the welding strength and yield between the pole body and the bus bar.

[0016] In an alternative embodiment, the support member further includes a second support portion which is disposed opposite to the first support portion in the height direction. One side of the second support portion in the height direction abuts against the second connecting portion, and the second support portion is adapted to be welded to the battery cover structure.

[0017] Beneficial effect: By welding the second support portion to the battery cover structure, the assembly of the cell pole assembly as a standardized module and the battery cover structure is realized, which is conducive to improving the assembly efficiency of the pole.

[0018] In an alternative embodiment, the thickness of the second support portion is F, and F satisfies 0.2 mm ≤ F ≤ 4 mm.

[0019] Beneficial effect: It can not only ensure the strength of the support member, so that the support member effectively supports the entire cell pole assembly after being welded to the cover plate or the housing, but also reduce the stamping difficulty of the support member and save costs.

[0020] In an alternative embodiment, a target end face is formed on one side of the pole body in the height direction; a groove is defined in the target end face, and the groove is adapted to be positioned when the pole body is welded to the bus bar.

[0021] Beneficial effects: When the pole column body is welded to the bus bar, the groove can be identified and positioned by the vision detection system, so as to realize the precise positioning between the pole column body and the bus bar.

[0022] In an optional embodiment, the depth of the groove is H, and H satisfies 0.5 mm ≤ H ≤ 2 mm.

[0023] Beneficial effects: It can not only avoid affecting the interface and strength of the composite of various metals in the pole column body, but also ensure the speed and accuracy of the groove identification and positioning by the vision detection system, thereby improving the production efficiency.

[0024] In an optional embodiment, the pole column body further includes a second step portion, and one side of the second step portion close to the target end face in the height direction is flush with the end face of the insulating member;

[0025] The distance between one side of the second step portion close to the target end face in the height direction and the target end face is M, and M satisfies 0.2 mm ≤ M ≤ 2 mm.

[0026] Beneficial effects: It can not only avoid welding quality problems such as explosion points during the welding process of the bus bar and the target end face, ensure the welding yield between the bus bar and the target end face, but also avoid increasing the height of the pole column body and ensure the volume energy density of the battery.

[0027] In a second aspect, the present utility model further provides a battery cover structure, including: a cover structure body, and the cell pole column assembly as described above.

[0028] Beneficial effects: The battery cover structure in the second aspect includes the cell pole column assembly in the first aspect. Therefore, the battery cover structure in the second aspect includes all the beneficial effects of the cell pole column assembly in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is an assembly schematic diagram of a cell pole column assembly according to an embodiment of the present utility model;

[0031] Figure 2 For Figure 1 The schematic diagram after hiding the insulating member in the cell pole column assembly in

[0032] Figure 3 For Figure 1Cross-sectional view of the insulating part of the middle cell pole column assembly;

[0033] Figure 4 Cross-sectional view of the support part of another cell pole column assembly according to an embodiment of the present invention;

[0034] Figure 5 Assembly schematic diagram of another cell pole column assembly according to an embodiment of the present invention;

[0035] Figure 6 Cross-sectional view of the support part of yet another cell pole column assembly according to an embodiment of the present invention;

[0036] Figure 7 Assembly schematic diagram of yet another cell pole column assembly according to an embodiment of the present invention;

[0037] Figure 8 Cross-sectional view of the support part of still another cell pole column assembly according to an embodiment of the present invention;

[0038] Figure 9 Assembly schematic diagram of still another cell pole column assembly according to an embodiment of the present invention;

[0039] Figure 10 Cross-sectional view of the pole column body of a cell pole column assembly according to an embodiment of the present invention;

[0040] Figure 11 is Figure 1 Partial enlarged schematic diagram at position P in the middle;

[0041] Figure 12 Explosion schematic diagram of a cell pole column assembly according to an embodiment of the present invention;

[0042] Figure 13 Explosion schematic diagram of an additional cell pole column assembly according to an embodiment of the present invention.

[0043] Explanation of reference numerals:

[0044] 10. Pole column body; 101. Target end face; 102. Groove; 11. First step portion; 12. Second step portion;

[0045] 20. Support part; 201. First accommodation space; 202. Third accommodation space; 21. First support portion; 22. Second support portion;

[0046] 30. Insulating part; 301. Second accommodation space; 31. First connection portion; 32. Second connection portion; 33. Third connection portion. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0048] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 13 , describing the embodiments of the present utility model.

[0049] According to an embodiment of the present utility model, on the one hand, a cell pole column assembly is provided, including:

[0050] A pole column body 10;

[0051] A support member 20, disposed around the outer periphery of the pole column body 10, with a side of the support member 20 close to the central region of the pole column body 10 spaced apart from the outer sidewall of the pole column body 10 to form a first accommodation space 201;

[0052] An insulating member 30, including a first connection portion 31 and a second connection portion 32. The first connection portion 31 is filled in the first accommodation space 201, and the second connection portion 32 is disposed on the opposite side of the support member 20 from the first connection portion 31. The first connection portion 31 and the second connection portion 32 jointly enclose a second accommodation space 301, and the second accommodation space 301 is adapted to accommodate the support member 20.

[0053] It should be noted that the pole column body 10 can be made of a single metal material such as aluminum alloy or pure copper, or a composite material of multiple metals, such as a composite material of aluminum alloy and copper. The support member 20 can be made of a metal material. The insulating member 30 can be made of materials such as polypropylene (PP) or liquid crystal polymer (LCP) that are convenient for injection molding.

[0054] In the process of the cell pole column assembly provided by the present utility model, as shown in Figure 2 shown, the pole column body 10 and the support member 20 can be first positioned in an injection mold, and a first accommodation space 201 is formed by spacing a side of the support member 20 close to the central region of the pole column body 10 from the outer sidewall of the pole column body 10; then the insulating member 30 is formed by injection molding, as shown in Figure 3As shown, the insulating member 30 is an integrally formed structure. The insulating member 30 mainly includes a first connecting portion 31 and a second connecting portion 32. During the injection molding process, the first connecting portion 31 is filled and formed within the first accommodating space 201, thereby providing insulating sealing between the pole column body 10 and the support member 20 and achieving relative fixation between the pole column body 10 and the support member 20. The second connecting portion 32 is formed on the opposite side of the support member 20 relative to the first connecting portion 31. The first connecting portion 31 and the second connecting portion 32 jointly wrap and fix the support member 20 during the injection molding process, so that the pole column body 10, the support member 20, and the insulating member 30 are fixedly formed into an integral standardized pole column module, facilitating assembly with the cover plate or the housing, thereby improving the assembly efficiency of the pole column and being beneficial to reducing production costs.

[0055] In some embodiments, a third accommodating space 202 is formed on the support member 20. The insulating member 30 further includes a third connecting portion 33. The third connecting portion 33 is filled within the third accommodating space 202 and is adapted to be connected to the first connecting portion 31 and / or the second connecting portion 32, thereby restricting the relative displacement between the support member 20 and the insulating member 30 and being beneficial to improving the overall structural strength of the battery cell pole column assembly.

[0056] In some embodiments, please refer to Figure 4 As shown, the third accommodating space 202 on the support member 20 can be a through opening. Please also refer to Figure 5 As shown, during the injection molding process of the insulating member 30, the third connecting portion 33 is injection-molded and filled within the third accommodating space 202. The third connecting portion 33 is simultaneously connected to the first connecting portion 31 and the second connecting portion 32, thereby restricting the relative displacement between the support member 20 and the insulating member 30 and being beneficial to improving the overall structural strength of the battery cell pole column assembly.

[0057] In some embodiments, the third accommodating space 202 on the support member 20 can also be a groove structure. Please refer to Figure 6 As shown, the third accommodating space 202 can be formed on the side of the support member 20 away from the pole column body 10. Please refer to Figure 8 As shown, the third accommodating space 202 can also be formed on the side of the support member 20 close to the pole column body 10. Please also refer to Figure 7 and Figure 9 As shown, during the injection molding process of the insulating member 30, the third connecting portion 33 is injection-molded and filled within the third accommodating space 202. The third connecting portion 33 is connected to the second connecting portion 32, thereby restricting the relative displacement between the support member 20 and the insulating member 30 and being beneficial to improving the overall structural strength of the battery cell pole column assembly.

[0058] In some embodiments, please refer to Figure 10 As shown, the pole column body 10 includes a first stepped portion 11. Please refer toFigure 8 As shown, the support member 20 includes a first support portion 21. Please also refer to Figure 5 As shown, the first support portion 21 is arranged above the first step portion 11, so that the first support portion 21 and the first step portion 11 support and fix each other in the height direction, thereby improving the overall structural strength of the cell pole assembly.

[0059] In some embodiments, please refer to Figure 11 As shown, the distance between one side of the first support portion 21 close to the central region of the pole body 10 and one side of the first step portion 11 far from the central region of the pole body 10 is E, and E satisfies 0.5mm ≤ E ≤ 4mm.

[0060] It should be noted that the distance E between one side of the first support portion 21 close to the central region of the pole body 10 and one side of the first step portion 11 far from the central region of the pole body 10 can be regarded as the overlapping or lapping dimension between the first support portion 21 and the first step portion 11; the value of E cannot be too small, otherwise it is easy to reduce the strength of the cell pole assembly in the height direction. Therefore, the value of E needs to satisfy E ≥ 0.5mm; the value of E cannot be too large, otherwise it is easy to reduce the weldable surface of the pole body 10 and cannot ensure the welding strength and yield between the pole body 10 and the bus bar. Therefore, the value of E also needs to satisfy E ≤ 4mm.

[0061] In this embodiment, by satisfying 0.5mm ≤ E ≤ 4mm for the distance E between one side of the first support portion 21 close to the central region of the pole body 10 and one side of the first step portion 11 far from the central region of the pole body 10, the strength of the cell pole assembly can be ensured, and a sufficient weldable surface area of the pole body 10 can be ensured, thereby ensuring the welding strength and yield between the pole body 10 and the bus bar.

[0062] In some embodiments, please refer to Figure 8 As shown, the support member 20 further includes a second support portion 22. The second support portion 22 is arranged opposite to the first support portion 21 in the height direction. Please refer to Figure 9 As shown, one side of the second support portion 22 in the height direction abuts against the second connecting portion 32. By welding the second support portion 22 to the battery cover structure, the assembly of the cell pole assembly as a standardized module and the battery cover structure is realized, which is beneficial to improving the assembly efficiency of the pole.

[0063] Furthermore, the support member 20 further includes a third support portion (not shown in the figure). The third support portion is arranged between the first support portion 21 and the second support portion 22. The third support portion is adapted to connect the first support portion 21 and the second support portion 22; the first support portion 21 and the third support portion are jointly disposed in the second accommodation space 301.

[0064] In some embodiments, please refer to Figure 11 As shown, the thickness of the second support portion 22 is F, and F satisfies 0.2 mm ≤ F ≤ 4 mm.

[0065] It should be noted that the thickness F of the second support portion 22 cannot be too small, otherwise it is likely to cause insufficient strength of the support member 20, resulting in the inability to effectively support the entire cell pole assembly after the support member 20 is welded to the cover plate or the housing. Therefore, the value range of F needs to satisfy F ≥ 0.2 mm; the thickness F of the second support portion 22 cannot be too large either, otherwise it is not only likely to cause difficulty in stamping the support member 20, but also likely to increase costs. Therefore, the value range of F needs to satisfy F ≤ 4 mm.

[0066] In this embodiment, by satisfying 0.2 mm ≤ F ≤ 4 mm for the thickness F of the second support portion 22, it can not only ensure the strength of the support member 20, enabling the support member 20 to effectively support the entire cell pole assembly after being welded to the cover plate or the housing, but also reduce the stamping difficulty of the support member 20 and save costs.

[0067] In some embodiments, please refer to Figure 10 As shown, a target end face 101 is formed on one side in the height direction of the pole body 10; a groove 102 is formed on the target end face 101. When the pole body 10 is welded to the bus bar, the groove 102 can be identified and positioned by a vision detection system, so as to achieve precise positioning between the pole body 10 and the bus bar.

[0068] It should be noted that the groove 102 can be circular or square, and no specific limitation is made here.

[0069] In some embodiments, please refer to Figure 10 As shown, the depth of the groove 102 is H, and H satisfies 0.5 mm ≤ H ≤ 2 mm.

[0070] It should be noted that if the groove 102 is too deep, it is likely to affect the interface and strength of the composite of multiple metals of the pole body 10. Therefore, the depth H of the groove 102 needs to satisfy H ≤ 2 mm; if the groove 102 is too shallow, it is likely to affect the recognition and positioning rate of the groove 102 by the vision detection system and the accuracy of the vision detection system for recognizing and positioning the groove 102. Therefore, the depth H of the groove 102 also needs to satisfy H ≥ 0.5 mm.

[0071] In this embodiment, by satisfying 0.5 mm ≤ H ≤ 2 mm for the depth H of the groove 102, it can not only avoid affecting the interface and strength of the composite of multiple metals of the pole body 10, but also ensure the recognition and positioning rate and accuracy of the groove 102 by the vision detection system, thereby improving production efficiency.

[0072] In some embodiments, please refer to Figure 10As shown, the pole column body 10 further includes a second step portion 12. Please also refer to Figure 11 As shown, one side of the second step portion 12 close to the target end face 101 in the height direction is flush with the end face of the insulating member 30;

[0073] The distance between one side of the second step portion 12 close to the target end face 101 in the height direction and the target end face 101 is M, and M satisfies 0.2mm ≤ M ≤ 2mm.

[0074] It should be noted that the distance M between one side of the second step portion 12 close to the target end face 101 in the height direction and the target end face 101 can be regarded as the dimension that the target end face 101 exceeds the end face of the insulating member 30 in the height direction; the value of M cannot be too small, otherwise it is easy to cause welding quality problems such as explosion points during the welding process between the bus bar and the target end face 101, affecting the welding yield between the bus bar and the target end face 101, and even making it impossible to weld between the bus bar and the target end face 101. Therefore, the value range of M needs to satisfy M ≥ 0.2mm; the value of M cannot be too large either, otherwise it is easy to increase the height of the pole column body 10, resulting in a decrease in the volume energy density of the battery. Therefore, the value range of M also needs to satisfy M ≤ 2mm.

[0075] In this embodiment, by making the distance M between one side of the second step portion 12 close to the target end face 101 in the height direction and the target end face 101 satisfy 0.2mm ≤ M ≤ 2mm, it is possible to avoid welding quality problems such as explosion points during the welding process between the bus bar and the target end face 101, ensure the welding yield between the bus bar and the target end face 101, and at the same time avoid increasing the height of the pole column body 10 and ensure the volume energy density of the battery.

[0076] According to an embodiment of the present invention, on the other hand, a battery cover body structure is also provided, including: a cover body structure body and the above-mentioned battery cell pole column assembly.

[0077] It should be noted that the battery cell pole column assembly can be Figure 12 the circular structure shown in Figure 13 the rectangular structure shown in

[0078] This embodiment of the battery cover body structure includes the above-mentioned battery cell pole column assembly. Therefore, this embodiment of the battery cover body structure includes all the beneficial effects of the above-mentioned battery cell pole column assembly.

[0079] Although embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell pole assembly, characterized in that: include: pole body; A support member is arranged around the outer circumference of the pole body, and a side of the support member close to the central area of ​​the pole body is spaced from the outer side wall of the pole body to form a first accommodation space; The insulating member includes a first connecting portion and a second connecting portion, wherein the first connecting portion is filled in the first accommodating space, and the second connecting portion is arranged on the opposite side of the supporting member and the first connecting portion, and the first connecting portion and the second connecting portion are jointly enclosed to form a second accommodating space, and the second accommodating space is suitable for accommodating the supporting member.

2. The battery cell pole assembly according to claim 1, characterized in that: The support member is provided with a third accommodating space; the insulating member further comprises a third connecting portion, the third connecting portion is filled in the third accommodating space, and the third connecting portion is suitable for connecting with the first connecting portion and / or the second connecting portion.

3. The battery cell pole assembly according to claim 1, characterized in that: The pole body includes a first step portion; the support member includes a first support portion, and the first support portion is arranged above the first step portion.

4. The battery cell pole assembly according to claim 3, characterized in that: A distance E is between a side of the first support portion close to the central area of ​​the pole body and a side of the first step portion away from the central area of ​​the pole body, and E satisfies 0.5 mm≤E≤4 mm.

5. The battery cell pole assembly according to claim 3, characterized in that: The support member further includes a second support portion, which is arranged opposite to the first support portion in the height direction, one side of the second support portion in the height direction abuts against the second connecting portion, and the second support portion is suitable for welding with the battery cover structure.

6. The battery cell pole assembly according to claim 5, characterized in that: The thickness of the second supporting portion is F, and F satisfies 0.2 mm≤F≤4 mm.

7. The battery cell pole assembly according to any one of claims 1 to 6, characterized in that: A target end face is formed on one side of the pole body in the height direction; a groove is provided on the target end face, and the groove is suitable for positioning when the pole body is welded to the busbar.

8. The battery cell pole assembly according to claim 7, characterized in that: The depth of the groove is H, and H satisfies 0.5mm≤H≤2mm.

9. The battery cell pole assembly according to claim 7, characterized in that: The pole body further comprises a second step portion, wherein a side of the second step portion close to the target end surface along the height direction is flush with the end surface of the insulating member; A distance M between a side of the second step portion close to the target end surface along the height direction and the target end surface is M, and M satisfies 0.2 mm≤M≤2 mm.

10. A battery cover structure, characterized in that: include: A cover structure body, and a battery cell pole assembly as described in any one of claims 1 to 9 above.

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