Battery cell cover plate and battery cell

Abstract

The utility model provides a battery cell cover plate and a battery cell, the battery cell cover plate comprises a metal sheet, a pole, a sealing piece and a lower insulating piece, the lower insulating part is arranged at the bottom of the metal sheet, the pole comprises a pole body penetrating through the metal sheet and the lower insulating part and an extending part which is arranged at one end, close to the lower insulating part, of the pole body and extends outwards in the radial direction of the pole body, and the sealing part is sealed between the pole and the metal sheet; the lower insulating part is provided with a first insulating part extending between the outward extending part and the metal sheet, the sealing part is provided with a second insulating part extending between the outward extending part and the metal sheet, and the first insulating part and the second insulating part are arranged in a stacked mode. The battery cell cover plate disclosed by the utility model is simple in structure and convenient to assemble, and the first insulating part and the second insulating part are stacked, so that the insulation effect between the extending part and the metal sheet is favorably improved, creepage insulation failure in the use process is prevented, the insulation design of the battery cell cover plate is optimized, and the production yield of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, and in particular to a battery cover plate. At the same time, the utility model also relates to a battery cell provided with the battery cover plate. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, low self-discharge, and long cycle life. They are currently widely used in consumer electronics, electric vehicles, and energy storage. As a precision component, the battery cell cover plays an important role in the battery cell. The square battery cell cover currently on the market is assembled from poles, upper insulation, bare aluminum sheets, explosion-proof valves, etc. However, due to the structure of the existing battery cell cover, the assembly operation is relatively complicated, and the insulation design of the battery cell cover also has defects. During the use of the battery cell, there is a risk of insulation failure between the pole and the bare aluminum sheet, which can easily have an adverse effect on the working performance of the battery cell. Utility Model Content

[0003] In view of this, the utility model aims to provide a battery cover to optimize its insulation design.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A battery cell cover plate, comprising a metal sheet, a pole, a sealing member and a lower insulating member;

[0006] The lower insulating member is arranged at the bottom of the metal sheet, the pole comprises a pole body passing through the metal sheet and the lower insulating member, and an overhanging portion arranged at one end of the pole body close to the lower insulating member and extending radially outwardly from the pole body, and the sealing member is sealed between the pole and the metal sheet;

[0007] The lower insulating member is provided with a first insulating portion extending between the protruding portion and the metal sheet, and the sealing member is provided with a second insulating portion extending between the protruding portion and the metal sheet. The first insulating portion and the second insulating portion are stacked.

[0008] Furthermore, the sum of the thickness of the first insulating portion and the second insulating portion is greater than or equal to 0.6 mm;

[0009] And / or, the thickness of the first insulating part is 0.3 mm-2 mm.

[0010] Furthermore, the length L1 of the metal sheet and the length L2 of the lower insulating member satisfy:

[0011] L1-L2 ≥ 1.8 mm;

[0012] And / or, the width L3 of the metal sheet and the width L4 of the lower insulating member satisfy:

[0013] L3-L4≥1.5mm.

[0014] Furthermore, the lower insulating member includes a first part and a second part which are sequentially arranged along the length direction of the lower insulating member.

[0015] Furthermore, the first part and the second part both include an insulating body and a lower convex portion provided on the insulating body and extending downward, and the first insulating portion is provided on the insulating body;

[0016] The lower convex portion has a connection surface for hot-melt connection with the diaphragm of the electrode group, and the length of the connection surface is greater than or equal to 7 mm.

[0017] Furthermore, the metal sheet is provided with a mounting hole, and the battery cover plate further includes an explosion-proof valve arranged in the mounting hole, and a protective sheet covering the top of the mounting hole;

[0018] A gap is formed between the protective sheet and the metal sheet to connect the mounting hole with the outside.

[0019] Furthermore, a groove is provided on the lower insulating member at a position corresponding to the explosion-proof valve, and a plurality of communication holes penetrating the lower insulating member are provided on the bottom of the groove;

[0020] The sum of the areas of the communicating holes is greater than the area of ​​the exhaust hole of the explosion-proof valve.

[0021] Furthermore, when the length of the metal sheet is less than or equal to 200 mm, the width of the gap between the lower plastic near the pole and the metal sheet is less than or equal to 1.5 mm;

[0022] When the length of the metal sheet is greater than 200 mm, the width of the gap between the lower plastic near the pole and the metal sheet is less than or equal to 2.5 mm.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] The battery cover described in the utility model can realize the assembly of the lower insulating part and the sealing part by providing an extension part on the pole, and limiting the first insulating part and the second insulating part by the extension part and the metal sheet, and has a simple structure and convenient operation. In addition, the first insulating part and the second insulating part are stacked, which is conducive to improving the insulation effect between the extension part and the metal sheet, preventing the occurrence of creepage insulation failure during use, optimizing the insulation design of the battery cover, and improving the production yield of the battery.

[0025] In addition, by making the sum of the thickness of the first insulating part and the second insulating part greater than or equal to 0.6 mm, and making the thickness of the first insulating part 0.3 mm-2 mm, it is helpful to ensure the insulation performance between the protruding part and the metal sheet and the reliability of the assembly of the lower insulating part. In addition, by making the lower insulating part include the first part and the second part separately arranged along its own length direction, it is easy to reduce the bending deformation of the lower insulating part downward, and the structure is simple and easy to assemble.

[0026] In addition, by providing a lower protrusion on the insulating body, the pole group in the battery cell can be limited to prevent the pole group from shaking too much during the use of the battery cell, and the length of the connection surface is greater than or equal to 7 mm, which is beneficial to ensure the connection strength between the diaphragm and the lower insulating member.

[0027] Another object of the present invention is to provide a battery cell, comprising a shell, a pole group arranged in the shell, and the battery cell cover plate as described above arranged at an opening on the top of the shell.

[0028] Furthermore, the bottom of the metal sheet abuts against the top of the shell, and the lower insulating member extends into the shell through the opening;

[0029] The distance between the bottom of the lower insulating member and the top of the pole group is less than or equal to 2 mm.

[0030] The battery cell of the utility model has a simple structure and is easy to assemble by being provided with the battery cell cover plate as described above, and is beneficial to ensuring the production yield of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0032] Figure 1 A top view of the battery cover plate according to an embodiment of the utility model;

[0033] Figure 2 for Figure 1 Sectional view in the AA direction;

[0034] Figure 3 for Figure 2 A magnified view of part B;

[0035] Figure 4 This is an exploded view of the parts of the battery cover plate according to an embodiment of the utility model;

[0036] Figure 5 This is a schematic structural diagram of the lower insulating member according to an embodiment of the utility model;

[0037] Figure 6 A top view of the lower insulating member according to an embodiment of the utility model;

[0038] Figure 7 It is a schematic diagram of the internal structure of the battery cell described in an embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. Metal sheet; 2. Pole; 201. Pole body; 202. Outer extension; 3. Sealing member; 4. Lower insulating member; 401. First portion; 4011. First insulating member body; 4012. First lower convex portion; 4013. Second lower convex portion; 402. Second portion; 4021. Second insulating member body; 4022. Third lower convex portion; 4023. Fourth lower convex portion;

[0041] 5. First insulating part; 6. Second insulating part; 7. Connection surface; 8. Mounting hole; 9. Protective sheet; 10. Notch; 11. Groove; 12. Connecting hole; 13. Shell; 14. Pole group; 15. Connection block; 16. Upper insulating part; 17. Positioning column. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0043] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0045] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0046] Embodiment 1

[0047] This embodiment relates to a battery cell cover plate, the overall structure of which is as follows: Figure 1 , Figure 2 and Figure 3 As shown in , the cell cover includes a metal sheet 1, a pole 2, a seal 3 and a lower insulating member 4. The lower insulating member 4 is arranged at the bottom of the metal sheet 1, the pole 2 includes a pole body 201 passing through the metal sheet 1 and the lower insulating member 4, and an overhang 202 arranged at one end of the pole body 201 close to the lower insulating member 4 and extending radially outwardly along the pole body 201. The seal 3 is sealed between the pole 2 and the metal sheet 1, the lower insulating member 4 is provided with a first insulating portion 5 extending between the overhang 202 and the metal sheet 1, the seal 3 is provided with a second insulating portion 6 extending between the overhang 202 and the metal sheet 1, and the first insulating portion 5 is arranged in a stacked manner.

[0048] It can be understood that in this embodiment, by providing an extension 202 on the pole 2, and limiting the first insulating part 5 and the second insulating part 6 by the extension 202 and the metal sheet 1, the lower insulating part 4 and the sealing part 3 can be assembled, and the structure is simple and the operation is convenient. In addition, the first insulating part 5 and the second insulating part 6 are stacked, which is conducive to improving the insulation effect between the extension 202 and the metal sheet 1, preventing the occurrence of creepage insulation failure during use, optimizing the insulation design of the battery cover, and improving the battery production yield.

[0049] Based on the above overall introduction, as a preferred implementation, in this embodiment, the sum of the thickness of the first insulating part 5 and the second insulating part 6 is greater than or equal to 0.6 mm, and the thickness of the first insulating part 5 is 0.3 mm-2 mm, wherein the sum of the thickness of the first insulating part 5 and the second insulating part 6 can be specifically 0.6 mm, 1 mm, 2 mm, and 3 mm, etc. And the thickness of the first insulating part 5 can be specifically 0.3 mm, 0.8 mm, 1 mm, 1.5 mm, and 2 mm, etc.

[0050] By setting the sum of the thicknesses of the first insulating part 5 and the second insulating part 6 within the above-mentioned size range, it is beneficial to further ensure the insulation performance between the protruding part 202 and the metal sheet 1 and prevent insulation failure. And setting the thickness of the first insulating part 5 within the above-mentioned size range is beneficial to ensure the reliability of the assembly of the lower insulating part 4. It should be noted that both the sum of the thicknesses of the first insulating part 5 and the second insulating part 6 being greater than or equal to 0.6mm and the thickness of the first insulating part 5 being 0.3mm-2mm are only used as a preferred implementation. In addition, in other embodiments, it is also possible to choose to set the thickness of the first insulating part 5 in other ranges while making the sum of the thicknesses of the first insulating part 5 and the second insulating part 6 greater than or equal to 0.6mm, or to set the thickness of the first insulating part 5 to other sizes while making the thickness of the first insulating part 5 to 0.3mm-2mm.

[0051] As a preferred embodiment, in this embodiment, the length L1 of the metal sheet 1 and the length L2 of the lower insulating member 4 satisfy L1-L2≥1.8mm. The width L3 of the metal sheet 1 and the width L4 of the lower insulating member 4 satisfy L3-L4≥1.5mm. The size difference between L1 and L2 can be specifically 1.8mm, 2mm, 2.5mm and 3mm, etc. The size difference between L3 and L4 can be specifically 1.5mm, 1.8mm, 2mm, 2.5mm and 3mm, etc. By making the length difference between the metal sheet 1 and the lower insulating member 4, and the width difference between the metal sheet 1 and the lower insulating member 4 meet the above-mentioned size range, it is convenient to assemble the battery cover on the battery shell. Of course, making the difference between L1 and L2 greater than or equal to 1.8mm, and making the difference between L3 and L4 greater than or equal to 1.5mm, is only a preferred embodiment. In addition, in other embodiments, the difference between L1 and L2, or the difference between L3 and L4 can also be set to other sizes.

[0052] As a preferred example, Figure 4 As shown in , the lower insulating member 4 includes a first portion 401 and a second portion 402 sequentially arranged along its length direction. It should be noted that in the specific design, due to the long length of the lower insulating member 4, after the lower insulating member 4 is assembled, the middle position thereof will usually bend and deform downward under the action of its own gravity, and during the assembly process, it may interfere with the pole group 14 in the battery cell shell, thereby affecting the normal assembly of the battery cell cover.

[0053] In this embodiment, the lower insulating member 4 includes a first portion 401 and a second portion 402 which are separately arranged along the length direction thereof. The lengths of the first portion 401 and the second portion 402 are relatively short, which is convenient for reducing the downward bending deformation of the lower insulating member 4. The structure is simple and easy for assembly. In actual design, it is preferred that the downward bending dimension of the first portion 401 and the second portion 402 near the middle of the metal sheet 1 is less than or equal to 2 mm.

[0054] As a preferred implementation, in this embodiment, the first part 401 and the second part 402 both include an insulating body and a lower convex portion provided on the insulating body and extending downward, and the first insulating portion 5 is provided on the insulating body. The lower convex portion has a connection surface 7 for hot-melt connection with the diaphragm of the electrode group 14, and the length of the connection surface 7 is greater than or equal to 7 mm.

[0055] like Figure 5 and Figure 6As shown in , in a specific implementation, the first part 401 includes a first insulating member body 4011, and a first lower convex portion 4012 and a second lower convex portion 4013 provided at both ends of the length direction of the first insulating member body 4011, and the second part 402 includes a second insulating member body 4021, and a third lower convex portion 4022 and a fourth lower convex portion 4023 provided at both ends of the length direction of the second insulating member body 4021. By providing the lower convex portion, after the cell cover is assembled to the cell housing, the lower convex portion can limit the pole group 14 in the cell, so as to prevent the pole group 14 from shaking too much during the use of the cell, thereby causing adverse effects on the use of the cell.

[0056] In addition, the above-mentioned connection surface 7 is specifically the side surfaces of each lower convex portion facing the inner wall of the battery housing 13 after the battery cover plate and the battery housing are assembled, and the length of each connection surface 7 can be 7 mm, 8 mm, 9 mm, etc. By setting the connection surface 7 within the above-mentioned size range, it is helpful to ensure the connection strength between the diaphragm and the lower insulating member 4. Of course, the lower insulating member 4 is only set as a preferred embodiment. In other embodiments, the lower insulating member 4 can also be designed as an integrated type.

[0057] In addition, if Figure 2 As shown in FIG. 1 , chamfers may be provided at the bottom of the first lower protrusion 4012 and the fourth lower protrusion 4023 near the two ends of the lower insulating member 4 in the length direction, so as to facilitate the cell cover to be installed in the battery housing 13. In specific implementation, the depth and width of the chamfers are preferably greater than or equal to 1 mm.

[0058] As a preferred implementation method, Figure 1 and Figure 2 As shown in , in this embodiment, a mounting hole 8 is provided on the metal sheet 1, and the battery cover plate also includes an explosion-proof valve arranged in the mounting hole 8, and a protective sheet 9 covering the top of the mounting hole 8. A gap 10 connecting the mounting hole 8 with the outside is formed between the protective sheet 9 and the metal sheet 1. By providing the protective sheet 9, it is convenient to protect the explosion-proof valve, and by forming the gap 10 between the protective sheet 9 and the metal sheet 1, it is beneficial for the battery cell to maintain breathing and ensure the pressure balance inside and outside the battery cell. It should be noted that the explosion-proof valve in this embodiment can be selected from the explosion-proof valve commonly used in existing battery cells, and it will not be described in detail here.

[0059] As a preferred embodiment, in this embodiment, a downwardly sunken groove 11 is provided at a position corresponding to the explosion-proof valve on the lower insulating member 4, and a plurality of connecting holes 12 are provided at the bottom of the groove 11, and the area of ​​each connecting hole 12 and the area S1 and the exhaust hole area S2 of the explosion-proof valve meet: 1≤S1 / S2≤2.2, and the ratio of S1 to S2 can be 1, 1.5, 2, and 2.2, etc. By providing the groove 11, it is convenient for the lower insulating member 4 to protect the explosion-proof valve, and by providing the connecting holes 12 on the groove 11, and setting the ratio of the area of ​​each connecting hole 12 and the area S1 and the exhaust hole area S2 of the explosion-proof valve within the above range, the arrangement of the connecting holes 12 is convenient, and it is beneficial to discharge the gas in the battery cell in time when thermal runaway occurs in the battery cell. In a specific implementation, the area of ​​the groove 11 can be larger than the area of ​​the mounting hole 8.

[0060] like Figure 5 As shown in the figure, in this embodiment, two positioning posts 17 are respectively provided on the first part 401 and the second part 402, and positioning holes corresponding to the positioning posts 17 can be provided on the metal sheet 1 to facilitate positioning when the lower insulating member 4 is assembled with the metal sheet 1.

[0061] like Figure 2 As shown in the figure, in this embodiment, a connection block 15 is provided at one end of the pole body 201 away from the lower insulating member 4, and the connection block 15 and the pole body 201 can be connected by welding. An upper insulating member 16 is provided between the connection block 15 and the metal sheet 1 to ensure the insulation effect between the connection block 15 and the metal sheet 1.

[0062] It is worth noting that in this embodiment, the above-mentioned first part 401 and the second part 402 can both be injection molded, and the length of the burr of the first part 401 and the second part 402 should be less than or equal to 1mm, and the length of the burr at the ejector position should be less than or equal to 0.5mm, the length of the rubber wire of the first part 401 and the second part 402 should be less than or equal to 3mm, and the shaking amplitude of the lower insulating part 4 after assembly cannot exceed the edge of the metal sheet 1.

[0063] In addition, as a preferred implementation, in this embodiment, when the length of the metal sheet 1 is less than or equal to 200 mm, the width of the gap between the lower insulating member 4 near the pole 2 and the metal sheet 1 is less than or equal to 1.5 mm, which can be specifically 1.5 mm, 1.0 mm, 0.5 mm, etc. When the length of the metal sheet 1 is greater than 200 mm, the gap between the lower insulating member 4 near the pole 2 and the metal sheet 1 is less than or equal to 2.5 mm, which can be specifically 2.5 mm, 2 mm, 1 mm, and 0.5 mm, etc. It should be noted that the width of the above gap is the distance between the lower insulating member 4 and the metal sheet 1.

[0064] It should be noted that due to the existence of assembly errors and production errors, a gap will inevitably exist between the lower insulating part 4 and the metal sheet 1 during the actual production process. In this embodiment, by limiting the gap between the position of the lower insulating part 4 close to the pole 2 and the metal sheet 1 within the above-mentioned size range, it is convenient to prevent interference between the lower insulating part 4 and the pole group 14, and facilitate the assembly of the battery cover and the battery shell.

[0065] When assembling the cell cover of this embodiment, the upper insulating member 16, the lower insulating member 4, the sealing member 3 and the metal sheet 1 can be assembled first, and then the pole 2 can be passed through the lower insulating member, the metal sheet 1 and the upper insulating member 16 in sequence, and then the connecting block 15 and the pole 2 are welded to complete the assembly. And the sealing member 3 can be a sealing ring commonly used in the prior art, which will not be described in detail here. In addition, the metal sheet 1 of this embodiment can be a plain aluminum sheet commonly used in the prior art, and the upper insulating member 16 and the lower insulating member 14 can be made of plastic materials commonly used in the prior art.

[0066] The cell cover of the present embodiment is provided with an extension portion 202 on the pole 2, and the first insulating portion 5 and the second insulating portion 6 are stacked between the extension portion 202 and the metal sheet 1. This facilitates assembly and helps to ensure the assembly reliability of the cell cover. It is also beneficial to improve the insulation effect between the extension portion 202 and the metal sheet 1, prevents creepage insulation failure during use, optimizes the insulation design of the cell cover, and improves production yield.

[0067] Embodiment 2

[0068] This embodiment relates to a battery cell. In terms of overall structure, the battery cell includes a shell 13 , a pole group 14 disposed in the shell 13 , and a battery cell cover of the first embodiment disposed at an opening at the top of the shell 13 .

[0069] As a preferred implementation method, Figure 7 As shown in the figure, in the present embodiment, the bottom of the metal sheet 1 abuts against the top of the shell 13, the lower insulating member extends into the shell 13 through the opening, and the distance between the bottom of the lower insulating member and the top of the pole group 14 is less than or equal to 2 mm, which can be specifically 2 mm, 1.5 mm, 1 mm, 0.5 mm, etc. Such a setting can prevent the pole group 14 in the battery cell from having a large amount of shaking during the use of the battery cell, which has an adverse effect on the normal use of the battery cell.

[0070] The battery cell of this embodiment is provided with the battery cell cover plate of the first embodiment, so it has a simple structure, is easy to assemble, and is conducive to ensuring the production yield of the battery cell.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: It includes metal sheets, poles, seals and lower insulating parts; The lower insulating member is arranged at the bottom of the metal sheet, the pole comprises a pole body passing through the metal sheet and the lower insulating member, and an overhanging portion arranged at one end of the pole body close to the lower insulating member and extending radially outwardly from the pole body, and the sealing member is sealed between the pole and the metal sheet; The lower insulating member is provided with a first insulating portion extending between the protruding portion and the metal sheet, and the sealing member is provided with a second insulating portion extending between the protruding portion and the metal sheet. The first insulating portion and the second insulating portion are stacked.

2. The cell cover plate according to claim 1, characterized in that: The sum of the thickness of the first insulating portion and the second insulating portion is greater than or equal to 0.6 mm; And / or, the thickness of the first insulating part is 0.3 mm-2 mm.

3. The cell cover plate according to claim 1, characterized in that: The length L1 of the metal sheet and the length L2 of the lower insulating member satisfy: L1-L2 ≥ 1.8 mm; And / or, the width L3 of the metal sheet and the width L4 of the lower insulating member satisfy: L3-L4≥1.5mm.

4. The cell cover plate according to claim 1, characterized in that: The lower insulating member includes a first portion and a second portion which are sequentially arranged along the length direction of the lower insulating member.

5. The cell cover plate according to claim 4, characterized in that: The first part and the second part both include an insulating body and a lower convex portion provided on the insulating body and extending downward, and the first insulating portion is provided on the insulating body; The lower convex portion has a connection surface for hot-melt connection with the diaphragm of the electrode group, and the length of the connection surface is greater than or equal to 7 mm.

6. The cell cover plate according to claim 1, characterized in that: The metal sheet is provided with a mounting hole, and the battery cover plate further includes an explosion-proof valve arranged in the mounting hole, and a protective sheet covering the top of the mounting hole; A gap is formed between the protective sheet and the metal sheet to connect the mounting hole with the outside.

7. The cell cover plate according to claim 6, characterized in that: A groove is provided on the lower insulating member at a position corresponding to the explosion-proof valve, and a plurality of communication holes penetrating the lower insulating member are provided at the bottom of the groove; The sum of the areas S1 of the communicating holes and the area S2 of the exhaust hole of the explosion-proof valve satisfy: 1≤S1 / S2≤2.

2.

8. The cell cover plate according to any one of claims 1 to 7, characterized in that: When the length of the metal sheet is less than or equal to 200 mm, the width of the gap between the lower insulating member close to the pole and the metal sheet is less than or equal to 1.5 mm; When the length of the metal sheet is greater than 200 mm, the width of the gap between the position of the lower insulating member close to the pole and the metal sheet is less than or equal to 2.5 mm.

9. A battery cell, characterized in that: The invention comprises a shell, a pole group arranged in the shell, and a cell cover plate according to any one of claims 1 to 8 arranged at an opening on the top of the shell.

10. The battery cell according to claim 9, characterized in that: The bottom of the metal sheet abuts against the top of the shell, and the lower insulating member extends into the shell through the opening; And / or, the distance between the bottom of the lower insulating member and the top of the pole group is less than or equal to 2 mm.

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