Cover plate assembly, battery cell and battery pack

Abstract

The utility model discloses a cover plate assembly with high assembly efficiency, a battery cell and a battery pack, and the cover plate assembly comprises a cover body which is provided with a mounting hole; the first insulating sealing element comprises a first part positioned on the inner side of the cover body and a second part positioned in the mounting hole; the second part is of an annular structure and extends to the outer side of the cover body from the first part; the pole comprises a first central part and a first edge part extending around the first central part; the connecting piece comprises a first connecting part and a second connecting part which are connected with each other; the first connecting part comprises a second central part and a second edge part extending around the second central part; the first central part and the second central part are oppositely arranged and connected, the joint of the two central parts is located in the annular structure, and the first edge part and the second edge part are located on the two axial sides of the annular structure respectively; at least part of the annular structure is pressed and connected between the first edge part and the second edge part, so that the second part is pressed and fixed on the cover body; and at least part of the structure of the first part is pressed and fixed between the second connecting part and the cover body.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a cover plate assembly, a battery cell and a battery pack. Background Art

[0002] The battery cover plate assembly is used to complete the sealing and assembly of the battery. The battery cover plate assembly is usually assembled by multiple structural parts, and an assembly gap needs to be left between the structural parts. The electrolyte is likely to leak from the assembly gap, so insulation and sealing treatments are required.

[0003] In the related art, plastic parts are arranged between the cover plate and the pole column and between the cover plate and the connecting part for insulation, and a sealing ring is arranged between the cover plate and the pole column for sealing. However, this insulation and sealing method requires additional assembly processes to fix the plastic parts between the pole column and the connecting part, between the plastic parts and the connecting part, and between the sealing ring and the pole column. The assembly process is relatively complex, thus affecting the assembly efficiency of the battery cover plate assembly. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defect of low assembly efficiency of the battery cover plate assembly in the related art, so as to provide a cover plate assembly, a battery cell and a battery pack.

[0005] In the first aspect, the utility model provides a cover plate assembly for closing a battery cell housing to form a battery cell. The cover plate assembly includes: a cover body provided with an installation hole penetrating the inner side and the outer side of the cover body; a first insulation and sealing member including a first part and a second part, the first part being located inside the cover body; the second part being a ring structure located in the installation hole, and the ring structure extending from the first part to the outside of the cover body; a pole column having conductivity; the pole column including a first central part and a first edge part extending around the first central part; a connecting member having conductivity; the connecting member including a connected first connecting part and a second connecting part, the first connecting part including a second central part and a second edge part extending around the second central part; wherein, the first central part and the second central part are oppositely arranged and connected, the connection part of the first central part and the second central part is located inside the ring structure, the first edge part and the second edge part are respectively located on the axial two sides of the ring structure; at least part of the ring structure is crimped between the first edge part and the second edge part to press and fix the second part on the cover body; at least part of the first part is pressed and fixed between the second connecting part and the cover body.

[0006] Optionally, the second central part protrudes from the second edge part towards the first central part, and a groove is formed on the side of the second central part away from the first central part.

[0007] Optionally, the second edge part is connected to the second connecting part, and the second edge part protrudes from the second connecting part towards the cover body; the first part is sleeved on the outer peripheral side of the second edge part.

[0008] Optionally, the cover body is provided with a first through hole penetrating the inner side and the outer side of the cover body, and the first part is correspondingly provided with a second through hole. The first through hole and the second through hole are adapted to expose at least part of the structure of the second connecting portion.

[0009] Optionally, the cover body is provided with two mounting holes, which are respectively located on both sides of the first through hole; the pole column includes a positive pole column and a negative pole column, and there are two connecting pieces; the positive pole column and the negative pole column are respectively installed in the two mounting holes and are respectively connected to the second central portions of the two connecting pieces.

[0010] Optionally, the cover plate assembly further includes a second insulating seal, and the second insulating seal is connected to the cover body and seals the first through hole.

[0011] Optionally, the second insulating seal is provided with a liquid injection hole and an explosion-proof valve.

[0012] Optionally, the second part includes a first plastic part and a sealing ring, and the first plastic part and the sealing ring together form an annular structure, and the sealing ring is located between the first plastic part and the first part.

[0013] In a second aspect, the present invention further provides an electric core, including: an electric core housing, which forms a cavity inside and is provided with an open mouth; a pole group, which is arranged inside the electric core housing; the cover plate assembly as described above, the cover plate assembly is sealingly arranged at the open mouth of the electric core housing, and the pole column is electrically connected to the pole group.

[0014] In a third aspect, the present invention further provides a battery pack, including: at least one electric core as described above.

[0015] By using the technical solution of the present invention, when assembling the cover plate assembly, the first part of the first insulating seal is located inside the cover body, and the second part is located in the mounting hole; after the first central portion of the pole column is connected to the second central portion of the connecting piece, the first edge portion of the pole column and the second edge portion of the connecting piece can press and fix the second part on the cover body, and the second connecting portion of the connecting piece can press and fix the first part on the cover body. That is to say, the technical solution of the present invention realizes the installation and fixation of the first insulating seal through the connection between the pole column and the connecting piece, simplifies the installation process of the cover plate assembly, and improves the assembly efficiency of the cover plate assembly. Description of the Drawings

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0018] Figure 2 Assembly schematic diagram of a cover plate assembly and a pole group according to an embodiment of the present utility model Figure 1 ;

[0019] Figure 3 is Figure 2 Internal structural schematic diagram;

[0020] Figure 4 Assembly schematic diagram of a cover plate assembly and a pole group according to an embodiment of the present utility model Figure 2 ;

[0021] Figure 5 is Figure 4 Internal structural schematic diagram;

[0022] Figure 6 Top view of a cover plate assembly according to an embodiment of the present utility model;

[0023] Figure 7 Cross-sectional view of a cover plate assembly according to an embodiment of the present utility model;

[0024] Figure 8 is Figure 7 Local enlarged view at position A in

[0025] Figure 9 is Figure 7 Local enlarged view at position B in

[0026] Figure 10 Partial structural schematic diagram of a cover plate assembly according to an embodiment of the present utility model;

[0027] Figure 11 Partial structural schematic diagram of a cover plate assembly from another perspective according to an embodiment of the present utility model.

[0028] Explanation of reference numerals:

[0029] 1. Cover plate assembly; 11. Cover body; 111. Mounting hole; 112. First through hole; 12. First insulating seal; 121. First part; 1211. Main body part; 1212. Convex part; 1213. Second through hole; 122. Second part; 1220. Card slot; 1221. First plastic part; 1222. Sealing ring; 13. Pole; 13a. Positive pole; 13b. Negative pole; 131. First central part; 132. First edge part; 14. Connecting piece; 141. First connecting part; 1411. Second central part; 1412. Second edge part; 1413. Groove; 142. Second connecting part; 15. Second insulating seal; 16. Liquid injection hole; 17. Explosion-proof valve;

[0030] 2. Battery cell housing

[0031] 3. Electrode assembly; 31. Positive electrode tab; 32. Negative electrode tab Detailed implementation manners

[0032] 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 with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0033] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 11 , to describe the embodiments of the present utility model

[0034] According to an embodiment of the present utility model, a battery pack is provided, which includes at least one battery cell. It can be understood that the battery pack may include one, two, or multiple battery cells. The present utility model does not specifically limit the number of battery cells provided, as long as the design requirements are met

[0035] Specifically, as Figures 1 to 5 shown, the battery cell includes a battery cell housing 2, an electrode assembly 3 disposed in the battery cell housing 2, and a cover assembly 1 for closing the battery cell housing 2. Among them, a cavity is formed inside the battery cell housing 2, and one end of the battery cell housing 2 is open; the electrode assembly 3 is disposed in the cavity of the battery cell housing 2; the cover assembly 1 is sealingly disposed at the open end of the battery cell housing 2 to close the battery cell housing 2 to form a battery cell. Moreover, a pole post 13 is provided on the cover assembly 1, and the pole post 13 is electrically connected to the electrode assembly 3 to realize the electrical energy transmission between the electrode assembly 3 and external components

[0036] Furthermore, the cover assembly 1 includes a cover body 11, a first insulating seal 12, the above-mentioned pole post 13, and a connecting member 14 disposed on the cover body 11

[0037] Specifically, the cover body 11 is provided with a mounting hole 111 penetrating through the inner side and the outer side of the cover body 11. Among them, the inner side of the cover body 11 refers to the side of the cover body 11 close to the battery cell housing 2 and the electrode assembly 3, and the outer side of the cover body 11 refers to the side of the cover body 11 far from the battery cell housing 2 and the electrode assembly 3

[0038] As Figure 8 and 9As shown, the above-mentioned first insulating seal 12 includes a first part 121 and a second part 122. Among them, the first part 121 is located inside the cover 11. The second part 122 is an annular structure, which is located in the mounting hole 111, and the annular structure extends from the first part 121 to the outside of the cover 11.

[0039] The terminal post 13 includes a first central part 131 and a first edge part 132 extending around the first central part 131. The connecting member 14 includes a connected first connecting part 141 and a second connecting part 142. The first connecting part 141 includes a second central part 1411 and a second edge part 1412 extending around the second central part 1411.

[0040] Among them, the first edge part 132 and the second edge part 1412 are respectively located on the two axial sides of the annular structure, that is, the first edge part 132 and the second edge part 1412 are respectively located inside and outside the cover 11. The first central part 131 and the second central part 1411 are arranged opposite to each other and connected, and the connection part of the first central part 131 and the second central part 1411 is located inside the annular structure. At least part of the annular structure is crimped between the first edge part 132 and the second edge part 1412 to tightly fix the second part 122 on the cover 11. At least part of the structure of the first part 121 is tightly fixed between the second connecting part 142 and the cover 11.

[0041] Moreover, both the terminal post 13 and the connecting member 14 are conductive, that is, both the terminal post 13 and the connecting member 14 are made of conductive metal materials. Exemplarily, the material of the terminal post 13 can be a copper-aluminum composite material or copper, etc., and its material specifically depends on whether it is a positive terminal post 13a or a negative terminal post 13b; the material of the connecting member 14 can be copper, etc.

[0042] Using the technical solution of the present utility model, when assembling the cover plate assembly 1, the first part 121 of the first insulating seal 12 is located inside the cover 11, and the second part 122 is located in the mounting hole 111. After the first central part 131 of the terminal post 13 is connected to the second central part 1411 of the connecting member 14, the first edge part 132 of the terminal post 13 and the second edge part 1412 of the connecting member 14 can tightly fix the second part 122 on the cover 11, and the second connecting part 142 of the connecting member 14 can tightly fix the first part 121 on the cover 11. That is, the technical solution of the present utility model realizes the installation and fixation of the first insulating seal 12 through the connection between the terminal post 13 and the connecting member 14, simplifies the installation process of the cover plate assembly 1, and improves the assembly efficiency of the cover plate assembly 1.

[0043] Further, in some embodiments, the second central portion 1411 protrudes from the second edge portion 1412 toward the first central portion 131. That is, the second central portion 1411 is a boss, and the second edge portion 1412 is located at one end of the boss away from the first central portion 131 and extends around the outer peripheral side of the boss, so as to facilitate the connection between the second central portion 1411 and the first central portion 131. Moreover, a groove 1413 is formed on the side of the second central portion 1411 away from the first central portion 131 to save the materials of the pole 13 and the connecting member 14 and reduce the production cost. Wherein, the connection between the first central portion 131 and the second central portion 1411 is specifically that the end face of the first central portion 131 away from the first edge portion 132 is connected to the end face of the second central portion 1411 away from the second edge portion 1412. Exemplarily, the two can be welded, such as welding the first central portion 131 and the second central portion 1411 by penetration welding at the groove 1413 formed in the second central portion 1411.

[0044] Further, in some embodiments, as Figure 3 and 5 shown, the second edge portion 1412 is connected to the second connecting portion 142, and the second edge portion 1412 protrudes from the second connecting portion 142 toward the cover body 11. Furthermore, a stepped structure is formed at the connection between the second edge portion 1412 and the second connecting portion 142, and this stepped structure provides an assembly space for the first part 121.

[0045] Specifically, the first part 121 of the first insulating seal 12 is sleeved on the outer peripheral side of the second edge portion 1412, and then the first part 121 is assembled between the connecting member 14 and the pole 13. Moreover, the second connecting portion 142 can provide a pressing force for a part of the structure of the first part 121 to press and fix at least a part of the structure of the first part 121 on the cover body 11, so that the first part 121 can be fixed on the cover body 11.

[0046] Exemplarily, the first part 121 can be a second plastic part, such as Figure 8 and 9As shown, the second plastic part specifically includes a main body portion 1211 and a convex portion 1212 that are connected. The convex portion 1212 protrudes from the main body portion 1211 toward the second part 122. Among them, a through hole is provided on the convex portion 1212, and the convex portion 1212 is sleeved on the outer peripheral side of the second insulating portion through the through hole, and at least part of the structure of the convex portion 1212 protrudes from the second edge portion 1412 and is connected to the second part 122. With such a setting, not only is the assembly of the second plastic part realized by using the pole column 13 and the connecting member 14, but also the convex portion 1212 can block between the second edge portion 1412 and the cover body 11 to play an insulating role, preventing the second edge portion 1412 from contacting the cover body 11 and causing an internal short circuit. The main body portion 1211 is located between the second connecting portion 142 and the inner side of the cover body 11. In some embodiments, as Figure 11 shown, the main body portion 1211 is configured as a sheet-like structure, and part of the structure of the main body portion 1211 is located between the second connecting portion 142 and the inner side of the cover body 11, and part of the structure is located between the inner side of the cover body 11 and the pole group 3. That is, the cross-sectional dimension of the main body portion 1211 is larger than the cross-sectional dimension of the second connecting portion 142 and basically covers the inner side of the cover body 11. In this way, the first part 121 not only plays an insulating role between the connecting member 14 and the cover body 11, but also plays an insulating role between the pole group 3 and the cover body 11.

[0047] Furthermore, the second part 122 of the first insulating seal 12 is an annular structure, and a clamping groove 1220 is formed on the outer peripheral side of the annular structure. At least part of the structure around the mounting hole 111 of the cover body 11 is clamped in the clamping groove 1220. And the first edge portion 132 of the pole column 13 and the second edge portion 1412 of the connecting member 14 clamp and fix the annular structure on the cover body 11 on the outer side and the inner side of the cover body 11 respectively.

[0048] Exemplarily, the second part 122 includes a first plastic part 1221 and a sealing ring 1222. The first plastic part 1221 and the sealing ring 1222 together form an annular structure, and the sealing ring 1222 is located between the first plastic part 1221 and the first part 121. That is, in the direction from the outer side to the inner side of the cover body 11, the first plastic part 1221, the sealing ring 1222 and the second plastic part are arranged in sequence. Among them, both the first plastic part 1221 and the sealing ring 1222 are generally annular, and the end faces of the first plastic part 1221 and the sealing ring 1222 in the axial direction are in contact with each other and together form the above-mentioned clamping groove 1220.

[0049] In some embodiments, as Figure 8 and 9As shown in the figure, the first plastic part 1221 is tightly fixed between the first edge part 132 and the outer side of the cover body 11. Specifically, a part of the structure of the first plastic part 1221 is sleeved on the outer side of the first central part 131, and a part of the structure extends to the outer side of the cover body 11 and is crimped between the first edge part 132 and the outer side of the cover body 11. The sealing ring 1222 abuts between the inner peripheral wall of the mounting hole 111 and the outer peripheral wall of the first central part 131; alternatively, a part of the sealing ring 1222 abuts between the inner peripheral wall of the mounting hole 111 and the outer peripheral wall of the first central part 131, and a part of the sealing ring 1222 abuts between the inner peripheral wall of the mounting hole 111 and the outer peripheral wall of the second central part 1411; the axial two ends of the sealing ring 1222 are respectively crimped between the second edge parts 1412 of the first plastic part 1221.

[0050] It should be noted that the present utility model does not specifically limit the structure of the first insulating seal 12, as long as the requirements of insulating and sealing the battery cell are met. In some embodiments, the first part 121 and the second part 122 may be integrally formed. Alternatively, in some embodiments, the first part 121 and the second part 122 may be connected to each other or separately provided. Alternatively, in some embodiments, the first part 121 is a second plastic part, the second part 122 includes the first plastic part 1221 and the sealing ring 1222, and the three are abutted and cooperated with each other.

[0051] It can be understood that, as Figure 11 shown in the figure, the first connecting part 141 of the connecting piece 14 is welded to the pole column 13 through the above-mentioned mounting hole 111, and the second connecting part 142 of the connecting piece 14 is located inside the cover body 11 and is used for connecting with the pole group 3, so as to realize the electrical connection between the pole column 13 and the pole group 3.

[0052] In some embodiments, as Figure 10 and 11 shown in the figure, the cover body 11 is provided with a first through hole 112 penetrating the inner side and the outer side of the cover body 11, and the above-mentioned first part 121 is correspondingly provided with a second through hole 1213. Specifically, a second through hole 1213 is formed in the main body part 1211 of the first part 121. The second through hole 1213 is arranged opposite to the first through hole 112, and preferably, they are arranged opposite to each other. The first through hole 112 and the second through hole 1213 jointly form an assembly space for the connecting piece 14 and the pole group 3, and this assembly space is suitable for exposing at least part of the structure of the second connecting part 142, so as to facilitate the electrical connection between the pole group 3 and the connecting piece 14.

[0053] Specifically, the connecting piece 14 is generally constructed as a sheet-like structure. Inside the cover body 11, at least part of the structure of the second connecting part 142 extends to the first through hole 112 and the second through hole 1213, so as to be exposed outside the cover body 11 through the first through hole 112 and the second through hole 1213.

[0054] In some embodiments, the cover body 11 is provided with two mounting holes 111, and the two mounting holes 111 are respectively located on both sides of the first through hole 112. Correspondingly, the pole columns 13 include a positive pole column 13a and a negative pole column 13b, and the positive pole column 13a and the negative pole column 13b are respectively installed in the two mounting holes 111. And there are two corresponding connecting pieces 14. One connecting piece 14 is used for electrically connecting the positive pole column 13a and the positive pole tab 31 of the electrode group 3, and the other connecting piece 14 is used for connecting the negative pole column 13b and the negative pole tab 32 of the electrode group 3. Wherein, both the positive pole column 13a and the negative pole column 13b include the above-mentioned first central part 131 and the first edge part 132. The first central parts 131 of the two are respectively connected to the two second central parts 1411 of the two connecting pieces 14, and the first edge parts 132 of the two are respectively matched with the two second edge parts 1412 of the two connecting pieces 14 to press and fix the annular structure in the mounting hole 111, and further form a sealed insulation relationship with the cover body 11.

[0055] It can be understood that in this embodiment, there are two of the above-mentioned second parts 122, that is, the annular structures, and the two annular structures are respectively pressed and fixed in the two mounting holes 111 of the cover body 11.

[0056] Specifically, as Figures 2 - 5 shown, the pole tabs of the electrode group 3 extend out of the opening facing the battery cell housing 2. The pole tabs include a positive pole tab 31 and a negative pole tab 32. The positive pole tab 31 and the negative pole tab 32 are arranged at intervals and are respectively arranged corresponding to the above-mentioned first through hole 112 and the second through hole 1213. Wherein, the positive pole tab 31 is arranged corresponding to the second connecting part 142 of the connecting piece 14 connected to the positive pole column 13a, and the negative pole tab 32 is arranged corresponding to the second connecting part 142 of the connecting piece 14 connected to the negative pole column 13b.

[0057] As Figure 2 and 3 shown, when the cover plate assembly 1 is installed on the battery cell housing 2, the positive pole tab 31 and the negative pole tab 32 extend out of the outside of the cover body 11 through the first through hole 112 and the second through hole 1213 and are located on one side of the corresponding second connecting part 142. As Figure 4 and 5 shown, the positive pole tab 31 and the negative pole tab 32 are respectively bent towards the corresponding second connecting part 142 and are electrically connected to the corresponding second connecting part 142 by welding. Exemplarily, laser welding or ultrasonic welding can be used to weld the positive pole tab 31 and the negative pole tab 32 to the corresponding second connecting part 142 respectively, so as to realize electrical connection.

[0058] Exemplarily, two positive electrode tabs 31 are provided. The two positive electrode tabs 31 are respectively located on both sides of the second connecting portion 142 connected to the positive electrode terminal 13, and are bent from both sides towards the middle of the second connecting portion 142. Exemplarily, a strip-shaped through hole is provided in the middle of the second connecting portion 142. In some assembly schemes, the positive electrode tab 31 can also pass through the strip-shaped through hole and be bent towards any one side of the two sides of the strip-shaped through hole. The bending and connection manner of the negative electrode tab 32 is the same as that of the positive electrode tab 31, and will not be elaborated here.

[0059] The utility model realizes the connection with the connecting member 14 through the bending of the tab, saves the bending process of the connecting member 14, improves the assembly efficiency of the battery cell, and further improves the production efficiency; moreover, it saves the internal space of the battery cell and improves the space utilization rate inside the battery cell.

[0060] Further, in some embodiments, as Figure 1 and 6 shown, the cover plate assembly 1 further includes a second insulating seal 15. The second insulating seal 15 is connected to the cover body 11 and seals the first through hole 112 to ensure the airtightness of the battery cell. Exemplarily. The second insulating seal 15 can be configured as a plate-like structure, and its shape is adapted to the opening shape of the first through hole 112 to facilitate sealing the first through hole 112.

[0061] Further, in some embodiments, as Figure 1 and 6 shown, the second insulating seal 15 is further provided with a liquid injection hole 16 and an explosion-proof valve 17. Among them, the liquid injection hole 16 is used to inject electrolyte into the electrode group 3. The explosion-proof valve 17 can be a weak area provided on the second insulating seal 15 to prevent the internal pressure of the battery cell from being too high and causing an explosion. In this embodiment, arranging the liquid injection hole 16 and the explosion-proof valve 17 on the second insulating seal 15 can increase the welding area between the connecting member 14 and the tab and improve the over-current capacity of the battery.

[0062] Although the 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 all fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly for closing a battery cell housing to form a battery cell, characterized in that, The cover plate assembly includes: A cover body provided with mounting holes penetrating the inner and outer sides of the cover body; A first insulating seal including a first part and a second part. The first part is located inside the cover body; the second part is in a ring structure, the ring structure is located in the mounting hole, and the ring structure extends from the first part to the outside of the cover body; A pole column having electrical conductivity; the pole column includes a first central part and a first edge part extending around the first central part; A connecting piece having electrical conductivity; the connecting piece includes a connected first connecting part and a second connecting part. The first connecting part includes a second central part and a second edge part extending around the second central part; Wherein, the first central part and the second central part are oppositely arranged and connected, the connection part of the first central part and the second central part is located inside the ring structure, the first edge part and the second edge part are respectively located on the two axial sides of the ring structure; at least part of the ring structure is crimped between the first edge part and the second edge part to tightly fix the second part on the cover body; at least part of the first part is tightly fixed between the second connecting part and the cover body.

2. The cover plate assembly according to claim 1, characterized in that The second central part protrudes from the second edge part towards the first central part, and a groove is formed on the side of the second central part away from the first central part.

3. The cover plate assembly according to claim 1, wherein The second edge part is connected to the second connecting part, and the second edge part protrudes from the second connecting part towards the cover body; the first part is sleeved on the outer peripheral side of the second edge part.

4. The cover plate assembly according to claim 3, wherein The cover body is provided with a first through hole penetrating the inner and outer sides of the cover body, and the first part is correspondingly provided with a second through hole. The first through hole and the second through hole are adapted to expose at least part of the structure of the second connecting part.

5. The cover plate assembly according to claim 4, characterized in that, The cover body is provided with two of the mounting holes, and the two mounting holes are respectively located on both sides of the first through hole; The pole column includes a positive pole column and a negative pole column, and two of the connecting pieces are provided; the positive pole column and the negative pole column are respectively installed in the two mounting holes and are respectively connected to the second central parts of the two connecting pieces.

6. The cover plate assembly according to claim 4, wherein, The cover plate assembly further includes a second insulating seal, and the second insulating seal is connected to the cover body and seals the first through hole.

7. The cover plate assembly according to claim 6, wherein The second insulating seal is provided with a liquid injection hole and an explosion-proof valve.

8. The cover plate assembly according to any one of claims 1-7, characterized in that, The second part includes a first plastic part and a sealing ring, and the first plastic part and the sealing ring jointly form the ring structure, and the sealing ring is located between the first plastic part and the first part.

9. A battery cell, characterized in that, Including: A battery cell housing having a cavity formed inside and an open end; A pole group disposed inside the battery cell housing; The cover plate assembly according to any one of claims 1-8, the cover plate assembly is sealingly disposed at the open end of the battery cell housing, and the pole column is electrically connected to the pole group.

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

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