Battery cell cover plate assembly, battery cell and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack. The battery cell cover plate assembly comprises a cover plate body, a first insulating part, a riveting block and a top cover patch, the first insulating part is provided with a containing groove formed by a first insulating part body and a protruding edge, the riveting block is arranged in the containing groove, and a first annular groove is formed between the protruding edge and the circumferential side wall of the riveting block; the top cover patch comprises a top cover patch body and an annular cover; the annular cover comprises a cover top, an inner ring side wall and an outer ring side wall, the inner ring side wall is connected with an inner ring of the cover top, one end of the outer ring side wall is connected with an outer ring of the cover top, the other end of the outer ring side wall is connected with the top cover patch body, the annular cover covers the convex edge, the inner ring side wall extends into the first annular groove, and the convex edge extends into the second annular groove of the annular cover. It can be ensured that an aluminum leakage area between the cover plate and the first insulating part is shielded by the annular cover, and short circuit caused by contact between metal wires generated in the assembling process of the riveting block or the pole and the cover plate body is prevented.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cover assembly, a battery cell and a battery pack. Background Art

[0002] Lithium-ion batteries, due to their high energy density, long cycle life, and environmentally friendly features, have become a core power source for new energy vehicles, energy storage systems, and consumer electronics. As market demands for battery energy density and safety continue to rise, battery structural design is becoming increasingly refined. The reliability of the cell cover, a key component for battery sealing and electrical connection, directly impacts the overall performance of the battery.

[0003] Lithium-ion battery cover plates typically consist of a bare aluminum sheet, a plastic cover, rivet blocks, and terminal blocks. The bare aluminum sheet and the plastic cover are insulated through injection molding or assembly, while the rivet blocks secure the terminal blocks and facilitate current transmission. During this process, the edges of the bare aluminum sheet must fit tightly against the plastic cover to prevent exposed metal. However, due to variations in the injection molding process or assembly tolerances, areas of aluminum may leak out of the plastic cover, exposing the underlying metal.

[0004] In the battery cell cover structure of related technologies, aluminum leakage areas can overlap with metal wires (such as burrs or processing residues) generated by the rivet block or the edge of the terminal, creating a short circuit risk. In addition, aluminum leakage can weaken the insulation performance between the busbar and the cover, potentially causing local breakdown under vibration or thermal expansion conditions, increasing the risk of battery short circuit and thermal runaway. Summary of the Invention

[0005] In view of this, the present invention provides a battery cover assembly, a battery cell and a battery pack to solve the problem of the risk of short circuit in the battery cell caused by the presence of aluminum leakage areas in the battery cover assembly.

[0006] In a first aspect, the present invention provides a battery cell cover assembly, comprising a cover body, a first insulating member, a rivet block and a top cover patch. The first insulating member is arranged on the first surface of the cover body, the first insulating member includes a first insulating member body and a convex edge arranged on the periphery of the first insulating member body, and the convex edge and the first insulating member body constitute a receiving groove; the rivet block is arranged in the receiving groove, and a first annular groove is provided between the convex edge and the circumferential side wall of the rivet block; the top cover patch includes a top cover patch body, the top cover patch body has an assembly hole that avoids the rivet block, and the top cover patch also includes an annular cover arranged on the periphery of the assembly hole and protruding from the top cover patch body; the annular cover includes a cover top extending radially along the assembly hole and an inner ring side wall and an outer ring side wall extending axially along the assembly hole, one end of the inner ring side wall is connected to the inner ring of the cover top, and the other end is a free end, one end of the outer ring side wall is connected to the outer ring of the cover top, and the other end is connected to the top cover patch body, the annular cover covers the convex edge, the inner ring side wall extends into the first annular groove, and along the direction close to the cover body, the annular cover constitutes a second annular groove, and the convex edge extends into the second annular groove.

[0007] Beneficial Effects: The present invention provides a cell cover assembly, wherein a gap is left between the convex edge of the first insulating member and the side wall of the rivet block, forming a first annular groove, and the annular cover of the top cover patch has a second annular groove, covering the convex edge, the inner ring side wall extends into the first annular groove, and the convex edge extends into the second annular groove. In this way, the convex edge and the annular cover form a mutually nested insulating sealing structure. This structure ensures that the aluminum leakage area between the cover plate and the first insulating member is shielded by the annular cover, avoiding direct exposure of the metal substrate of the cover plate, thereby completely blocking the short-circuit path caused by aluminum leakage, preventing the metal wire generated by the rivet block or the pole during assembly from contacting the cover plate body, and ensuring the insulation effect of the cell cover assembly.

[0008] In addition, the first annular groove and the second annular groove are connected between the rivet block, the first insulating part and the top cover patch, forming a circuitous path, which can significantly extend the insulation distance between the rivet block and the cover body, or between the pole and the cover body, thereby improving the insulation effect of the battery cell cover assembly.

[0009] In addition, a gap is set between the riveting block and the first insulating member to form a first annular groove, which can reduce the metal wire generated by friction or collision during the assembly of the cover plate, and further reduce the short circuit risk of the battery cell cover plate.

[0010] In an optional embodiment, along the thickness direction of the cover body, the height of the convex edge above the first insulating member body is A, measured in mm, satisfying: 0.7mm≤A≤4mm; along the thickness direction of the cover body, the height of the overlap between the inner ring side wall of the annular cover and the convex edge is h1, measured in mm, satisfying: 0.1≤h1 / A≤0.9.

[0011] In an optional embodiment, along the thickness direction of the cover plate body, the surface of the top of the annular cover is lower than the top surface of the riveting block, and the height difference is h2, in mm, satisfying: 0.1mm≤h2≤1mm.

[0012] In an optional embodiment, an assembly gap W1 is left between the inner ring side wall of the annular cover and the riveting block, with the unit being mm, and satisfying: 0.3 mm ≤ W1 ≤ 1 mm.

[0013] In an optional embodiment, an assembly gap W2 is left between the inner ring side wall and the convex edge of the annular cover, the unit being mm, and satisfying: 0.3 mm ≤ W2 ≤ 3 mm.

[0014] In an optional embodiment, an assembly gap W3 is left between the outer ring side wall and the convex edge of the annular cover, the unit being mm, and satisfying: 0.3mm≤W3≤3mm.

[0015] In an optional embodiment, the cover body is provided with a groove, the first insulating member is provided in the groove, and the convex edge extends out of the groove along the thickness direction of the cover body.

[0016] In an optional embodiment, two rivet blocks and two first insulating members are provided, and are spaced apart along the length direction of the cover body, and two assembly holes of the top cover patch and two annular covers are provided accordingly.

[0017] In a second aspect, the present invention further provides a battery cell comprising a housing, an electrode group, and a cell cover assembly according to any of the above technical solutions. The housing comprises a receiving cavity and an open end communicating with the receiving cavity; the electrode group is disposed within the receiving cavity of the housing; and the cell cover assembly is disposed at the open end of the housing to seal the electrode group within the receiving cavity.

[0018] Beneficial effects: Since the battery cell includes the battery cell cover plate assembly, it has all the technical effects of the battery cell cover plate assembly and will not be described in detail here.

[0019] In a third aspect, the present invention further provides a battery pack comprising the battery cell in the above technical solution.

[0020] Beneficial effects: Since the battery pack includes battery cells, it has all the technical effects of battery cells and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the structure of a battery cell with aluminum leaking from the cover in the related art;

[0023] Figure 2 This is a structural diagram of a battery cover assembly according to an embodiment of the present invention;

[0024] Figure 3 for Figure 2 The structural exploded diagram of the battery cover assembly shown;

[0025] Figure 4 for Figure 2 A top view of the cell cover assembly shown;

[0026] Figure 5 For the Figure 4 Cross-sectional view at AA in the middle;

[0027] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0028] Figure 7 for Figure 6 A partial enlarged view of point C in the middle.

[0029] Description of reference numerals:

[0030] 1. Cover plate body; 101. Groove; 2. First insulating member; 201. First insulating member body; 202. Raised edge; 3. Riveted block; 4. Top cover patch; 401. Top cover patch body; 402. Assembly hole; 403. Annular cover; 4031. Cover top; 4032. Inner ring side wall; 4033. Outer ring side wall; 5. Pole; 6. Second insulating member; 10. Cell cover plate assembly; 1001. First annular groove; 1002. Second annular groove. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0032] In the battery cover structure of the related art, due to the deviation of the injection molding process or the assembly tolerance, the edge of the bare aluminum sheet is prone to not being completely covered by the plastic, resulting in aluminum exposure. Figure 1 The K in the figure indicates the position where the metal wires generated during the assembly of the riveted blocks or terminals can easily overlap with the aluminum leaking area and cause a short circuit in the battery cell.

[0033] To address this problem, the present invention provides a cell cover assembly 10, a cell, and a battery pack.

[0034] The following combination Figures 2 to 7 , describing embodiments of the present invention.

[0035] According to an embodiment of the present invention, in the first aspect, a cell cover assembly 10 is provided, comprising a cover body 1, a first insulating member 2, a rivet block 3 and a top cover patch 4. The first insulating member 2 is provided on the first surface of the cover body 1, and the first insulating member 2 comprises a first insulating member body 201 and a convex edge 202 provided on the periphery of the first insulating member body 201, the convex edge 202 and the first insulating member body 201 forming a receiving groove; the rivet block 3 is provided in the receiving groove, and a first annular groove 1001 is provided between the convex edge 202 and the circumferential side wall of the rivet block 3; the top cover patch 4 comprises a top cover patch body 401, the top cover patch body 401 has an assembly hole 402 for avoiding the rivet block 3, and the top cover patch 4 further comprises an annular cover 403 provided on the periphery of the assembly hole 402 and protruding from the top cover patch body 401; the annular cover 403 It includes a cover top 4031 extending radially along the assembly hole 402 and an inner ring side wall 4032 and an outer ring side wall 4033 extending axially along the assembly hole 402, one end of the inner ring side wall 4032 is connected to the inner ring of the cover top 4031, and the other end is a free end, one end of the outer ring side wall 4033 is connected to the outer ring of the cover top 4031, and the other end is connected to the top cover patch body 401, the annular cover 403 covers the convex edge 202, the inner ring side wall 4032 extends into the first annular groove 1001, and along the direction close to the cover plate body 1, the annular cover 403 forms a second annular groove 1002, and the convex edge 202 extends into the second annular groove 1002.

[0036] Specifically, the cover body 1 is made of a metal substrate. In some embodiments, the cover body 1 is a plain aluminum sheet.

[0037] The present invention provides a cell cover plate assembly 10, in which a gap is left between the lip 202 of the first insulating member 2 and the side wall of the rivet block 3, forming a first annular groove 1001, and the annular cover 403 of the top cover patch 4 has a second annular groove 1002, covering the lip 202, and the inner ring side wall 4032 extends into the first annular groove 1001, and the lip 202 extends into the second annular groove 1002. In this way, the lip 202 and the annular cover 403 form a mutually nested insulating sealing structure. This structure ensures that the aluminum leakage area between the cover plate and the first insulating member 2 is shielded by the annular cover 403, avoiding direct exposure of the metal substrate of the cover plate, thereby completely blocking the short circuit path caused by aluminum leakage, preventing the metal wire generated by the rivet block 3 or the pole 5 during the assembly process from contacting the cover plate body 1, and ensuring the insulation effect of the cell cover plate assembly 10.

[0038] In addition, the first annular groove 1001 and the second annular groove 1002 are connected between the rivet block 3, the first insulating part 2 and the top cover patch 4, forming a circuitous path, which can significantly extend the insulation distance between the rivet block 3 and the cover body 1, or between the pole 5 and the cover body 1, thereby improving the insulation effect of the battery cell cover assembly 10.

[0039] In addition, a gap is set between the riveting block 3 and the first insulating member 2 to form a first annular groove 1001, which can reduce the metal wire generated by friction or collision during the cover assembly process and further reduce the short circuit risk of the battery cover.

[0040] Specifically, the cover body 1 has a first surface and a second surface that are oppositely arranged along its thickness direction. Figures 5 to 7 In the illustrated orientation, the first surface of the cover body 1 represents its upper surface, and the second surface of the cover body 1 represents its lower surface. When the cell cover assembly 10 is assembled to the cell housing, the first surface of the cover body 1 is the side away from the electrode group, and the second surface of the cover body 1 is the side close to the electrode group.

[0041] In some embodiments, along the thickness direction of the cover body 1, the height of the protrusion 202 above the first insulating member body 201 is A, measured in mm, satisfying: 0.7mm≤A≤4mm; along the thickness direction of the cover body 1, the height of the inner ring side wall 4032 of the annular cover 403 overlapping with the protrusion 202 is h1, measured in mm, satisfying: 0.1≤h1 / A≤0.9.

[0042] In this embodiment, the height A of the lip 202 above the first insulating member body 201 along the thickness direction of the cover body 1 is controlled to be greater than or equal to 0.7 mm. This ensures that the lip 202 has sufficient structural height to form an effective first annular groove 1001 between the lip 202 and the sidewall of the rivet block 3, allowing the lip 202 and the annular cover 403 of the top cover patch 4 to fit together and form an effective insulation effect. At the same time, the height A of the lip 202 above the first insulating member body 201 along the thickness direction of the cover body 1 is controlled to be less than or equal to 4 mm. The height of the lip 202 should not be too large, otherwise it will make the first insulating member 2 difficult to form, causing shrinkage or deformation in the first insulating member 2. It will also increase the overall thickness of the cover plate, occupying internal battery space and affecting energy density.

[0043] In this embodiment, the overlap ratio h1 / A between the inner sidewall 4032 of the annular cover 403 and the lip 202 along the thickness direction of the cover body 1 is controlled to be greater than or equal to 0.1. This ensures that the inner sidewall 4032 effectively covers the lip 202, maintaining insulation performance between the rivet block 3, the first insulating member 2, and the top cover patch 4 even in the presence of assembly tolerances or vibration displacement. Furthermore, the overlap ratio h1 / A between the inner sidewall 4032 of the annular cover 403 and the lip 202 along the thickness direction of the cover body 1 is controlled to be less than or equal to 0.9. This prevents excessive insertion of the inner sidewall 4032, which could lead to stress concentration at the base of the lip 202 and reduce the risk of cracking of the first insulating member 2. Furthermore, the elastic space at the top of the lip 202 is retained, allowing the annular cover 403 to deform appropriately during thermal expansion and contraction, thus avoiding damage caused by rigid extrusion.

[0044] This embodiment ensures that the annular cover 403 fully covers the aluminum leakage area and protects against aluminum leakage through the coordinated design of the height A of the ridge 202 and the overlap ratio h1 / A, while avoiding plastic wear or metal contact caused by excessive insertion, thereby significantly improving the safety and durability of the battery cover.

[0045] In some embodiments, along the thickness direction of the cover plate body 1 , the surface of the cover top 4031 of the annular cover 403 is lower than the top surface of the riveting block 3 , and the height difference is h2 (unit: mm), satisfying: 0.1mm≤h2≤1mm.

[0046] In this embodiment, the top surface of the annular cover 403 is lower than the top surface of the rivet block 3, and the height difference h2 is controlled within the range of 0.1 mm to 1 mm. While ensuring aluminum leakage protection, it avoids affecting the internal space utilization of the battery due to additional heightening of the rivet block 3 or the cover body 1.

[0047] In some embodiments, an assembly gap W1 is left between the inner ring side wall 4032 of the annular cover 403 and the riveting block 3 , with the unit being mm, satisfying: 0.3 mm ≤ W1 ≤ 1 mm.

[0048] In this embodiment, an assembly gap W1 is provided between the inner sidewall 4032 of the annular cover 403 and the rivet block 3, and is controlled within the range of 0.3 mm to 1 mm. This assembly gap W1 can absorb machining tolerances and assembly errors of the inner sidewall 4032 of the annular cover 403 and the rivet block 3, thereby preventing interference or forced assembly due to accumulated errors and reducing production difficulty and cost. If the assembly gap W1 is too small, less than 0.3 mm, it will make assembly of the top cover patch 4 difficult; if the assembly gap W1 is too large, greater than 1 mm, it will affect the dimensional design of the first insulating member 2 and is not recommended.

[0049] In some embodiments, an assembly gap W2 is left between the inner ring sidewall 4032 of the annular cover 403 and the flange 202 , with the unit being mm, satisfying: 0.3 mm≤W2≤3 mm.

[0050] In this embodiment, an assembly gap W2 is provided between the inner sidewall 4032 of the annular cover 403 and the flange 202, and is controlled within the range of 0.3 mm to 3 mm. This assembly gap W2 can absorb machining tolerances and assembly errors between the inner sidewall 4032 of the annular cover 403 and the flange 202 of the first insulating member 2, thereby preventing interference or forced assembly due to accumulated errors and reducing production difficulty and cost. If the assembly gap W2 is too small, less than 0.3 mm, it will make assembly of the top cover patch 4 difficult. If the assembly gap W2 is too large, greater than 3 mm, it will affect the dimensional design of the first insulating member 2 and is not recommended.

[0051] In some embodiments, an assembly gap W3 is left between the outer ring side wall 4033 of the annular cover 403 and the flange 202 , with the unit being mm, satisfying: 0.3 mm≤W3≤3 mm.

[0052] In this embodiment, an assembly gap W3 is provided between the outer sidewall 4033 of the annular cover 403 and the flange 202, and is controlled within the range of 0.3 mm to 3 mm. This assembly gap W3 can absorb machining tolerances and assembly errors between the outer sidewall 4033 of the annular cover 403 and the flange 202 of the first insulating member 2, thereby preventing interference or forced assembly due to cumulative errors and reducing production difficulty and cost. If the assembly gap W3 is too small, less than 0.3 mm, it will make assembly of the top cover patch 4 difficult. If the assembly gap W3 is too large, greater than 3 mm, it will affect the dimensional design of the first insulating member 2 and is not recommended.

[0053] In some embodiments, the cover body 1 is provided with a groove 101 , the first insulating member 2 is disposed in the groove 101 , and the protruding edge 202 extends out of the groove 101 along the thickness direction of the cover body 1 .

[0054] In this embodiment, a groove 101 is provided on the cover body 1 to accommodate the first insulating member 2. The groove 101 provides precise installation positioning for the first insulating member 2, preventing displacement of the first insulating member 2 during assembly or use, and ensuring a stable relative position relative to the cover body 1. The lip 202 of the first insulating member 2 extends out of the groove 101. That is, the lip 202 of the first insulating member 2 is higher than the first surface of the cover body 1. This increases the creepage distance between the rivet block 3 or the terminal 5 and the cover body 1, thereby improving the insulation performance of the battery cell cover assembly 10.

[0055] In some embodiments, the cell cover assembly 10 further includes a terminal 5. The cover body 1 is provided with a first terminal mounting hole, the first insulating member 2 is provided with a second terminal mounting hole, and the rivet block 3 is provided with a third terminal mounting hole. The first, second, and third terminal mounting holes are positioned correspondingly. The terminal 5 includes a terminal base plate and a terminal body. The terminal base plate is provided on the second surface of the cover body 1. The terminal body passes through the first, second, and third terminal mounting holes in sequence and is riveted to the rivet block 3.

[0056] In some embodiments, two rivet blocks 3 and two first insulating members 2 are provided and spaced apart along the length direction of the cover body 1 , and two assembly holes 402 and two annular covers 403 are provided on the top cover patch 4 .

[0057] The cell cover assembly 10 provided by the present invention is suitable for use as a cell cover for a bipolar column 5. In this embodiment, two polar columns 5 are provided, and correspondingly, two rivet blocks 3 and two first insulating members 2 are provided. Two assembly holes 402 are provided on the top cover patch 4, and an annular cover 403 is provided around each assembly hole 402.

[0058] Furthermore, in some embodiments, the two poles 5 are symmetrically distributed along the length direction of the cover body 1 .

[0059] In some embodiments, a second insulating member 6 is further included.

[0060] The second insulating member 6 is provided on the second surface of the cover body 1 and is located between the bottom plate of the pole 5 and the cover body 1 , and is used to insulate the bottom plate of the pole 5 and the cover body 1 .

[0061] In some embodiments, the first insulating member 2 and the second insulating member 6 are both plastic members.

[0062] According to an embodiment of the present invention, in a second aspect, a battery cell is provided, comprising a housing, an electrode group, and the battery cell cover assembly 10 of any of the above embodiments. The housing has a receiving cavity and an open end communicating with the receiving cavity; the electrode group is disposed within the receiving cavity of the housing; and the battery cell cover assembly 10 is disposed at the open end of the housing to seal the electrode group within the receiving cavity.

[0063] Because the battery cell includes the battery cell cover plate assembly 10 and has all the technical effects of the battery cell cover plate assembly 10 , they will not be described in detail here.

[0064] According to an embodiment of the present invention, in a third aspect, a battery pack is further provided, comprising the battery cell in the above embodiment.

[0065] Because the battery pack includes battery cells and has all the technical effects of battery cells, they will not be described here.

[0066] Although the embodiments of the present invention have been described with reference to 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. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: Cover plate body; a first insulating member, the first insulating member being disposed on the first surface of the cover body, the first insulating member comprising a first insulating member body and a convex edge disposed on a periphery of the first insulating member body, the convex edge and the first insulating member body forming a receiving groove; A riveting block, the riveting block being arranged in the accommodating groove, and a first annular groove being formed between the convex edge and the circumferential side wall of the riveting block; A top cover patch, the top cover patch includes a top cover patch body, the top cover patch body has an assembly hole that avoids the rivet block, and the top cover patch also includes an annular cover arranged at the periphery of the assembly hole and protruding from the top cover patch body; the annular cover includes a cover top extending radially along the assembly hole and an inner ring side wall and an outer ring side wall extending axially along the assembly hole, one end of the inner ring side wall is connected to the inner ring of the cover top, and the other end is a free end, one end of the outer ring side wall is connected to the outer ring of the cover top, and the other end is connected to the top cover patch body, the annular cover covers the convex edge, the inner ring side wall extends into the first annular groove, and along the direction close to the cover plate body, the annular cover constitutes a second annular groove, and the convex edge extends into the second annular groove.

2. The battery cover assembly according to claim 1, characterized in that: Along the thickness direction of the cover plate body, the height of the convex edge above the first insulating member body is A, in mm, and satisfies: 0.7mm≤A≤4mm, Along the thickness direction of the cover plate body, the height of the overlap between the inner ring side wall of the annular cover and the convex edge is h1, in mm, and satisfies: 0.1≤h1 / A≤0.

9.

3. The battery cover assembly according to claim 1 or 2, characterized in that: Along the thickness direction of the cover plate body, the surface of the top of the annular cover is lower than the top surface of the riveted block, and the height difference is h2, in mm, satisfying: 0.1mm≤h2≤1mm.

4. The battery cover assembly according to claim 1 or 2, characterized in that: An assembly gap W1 is left between the inner ring side wall of the annular cover and the riveted block, in mm, satisfying: 0.3mm≤W1≤1mm.

5. The battery cover assembly according to claim 1 or 2, characterized in that: An assembly gap W2 is left between the inner ring side wall of the annular cover and the convex edge, in mm, satisfying: 0.3mm≤W2≤3mm.

6. The battery cover assembly according to claim 1 or 2, characterized in that: An assembly gap W3 is left between the outer ring side wall of the annular cover and the convex edge, in mm, satisfying: 0.3mm≤W3≤3mm.

7. The battery cover assembly according to claim 1 or 2, characterized in that: The cover body is provided with a groove, the first insulating member is arranged in the groove, and along the thickness direction of the cover body, the convex edge extends out of the groove.

8. The battery cover assembly according to claim 1 or 2, characterized in that: Two of the riveting blocks and the first insulating member are provided, and are spaced apart along the length direction of the cover body. Two of the assembly holes of the top cover patch and two of the annular cover are provided correspondingly.

9. A battery cell, characterized in that: include: a housing, the housing having a receiving cavity and an open end communicating with the receiving cavity; a pole group, the pole group being arranged in the accommodating cavity of the shell; The battery cell cover plate assembly according to any one of claims 1 to 8, wherein the battery cell cover plate assembly is arranged at the open end of the shell to seal the electrode group in the accommodating cavity.

10. A battery pack, characterized in that: Including the battery cell according to claim 9.

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