Cover plate assembly and battery cell

Abstract

The utility model provides a cover plate assembly and a battery cell, and the cover plate assembly comprises a top cover which comprises a cover plate main body and a liquid injection hole penetrating through the cover plate main body; the cover plate body is provided with a protruding structure protruding in the first direction, and the protruding structure surrounds the liquid injection hole. The sealing nail comprises a connecting area and a sealing area, the connecting area is connected to the periphery of the sealing area, the connecting area comprises a connecting part and a positioning part, the positioning part is connected with the sealing area, the connecting part is connected with the first plate surface of the cover plate main body, and the sealing area is used for covering the liquid injection hole. According to the utility model, the top cover and the sealing nail can be quickly positioned through the matching of the convex structure and the positioning part, so that the welding efficiency of the sealing nail and the top cover is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Technology

[0002] The top cover of the battery cell has a liquid injection hole. The top cover needs to be fixed to the liquid injection hole by welding with a sealing nail to achieve the seal. However, the welding effect and welding efficiency between the sealing nail and the top cover need to be further improved. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a cover plate assembly and a battery cell to solve at least some of the technical problems in the background art.

[0004] To achieve the above objectives, this utility model provides a cover plate assembly, comprising:

[0005] The top cover includes a cover plate body and an injection hole that penetrates the cover plate body; the cover plate body is provided with a protruding structure that protrudes in a first direction; wherein, the cover plate body includes a first plate surface and a second plate surface that are disposed opposite to each other, and the first direction is the direction in which the second plate surface faces the first plate surface;

[0006] The sealing pin includes a connecting area and a sealing area. The connecting area is connected to the periphery of the sealing area. The connecting area includes a connecting part and a positioning part that cooperates with the protruding structure. The positioning part is connected to the sealing area. The connecting part is connected to the first plate surface of the cover plate body. The sealing area is used to cover the injection hole.

[0007] Furthermore, the cover plate body is also provided with a liquid injection area recessed in a second direction relative to the cover plate body, and the liquid injection hole is located in the liquid injection area; an electrolyte buffer space is formed between the sealing area and the liquid injection area;

[0008] The second direction is opposite to the first direction.

[0009] Furthermore, the second plate surface is provided with a groove that is recessed in the first direction, and the groove is located around the injection area.

[0010] Furthermore, in the first direction, the side of the sealing area away from the cover plate body is equal to the side of the connecting portion away from the cover plate body; the side of the sealing area near the cover plate body is equal to the side of the connecting portion near the cover plate body.

[0011] Furthermore, in the first direction, the side of the sealing area away from the cover plate body is at a height equal to the highest point of the positioning part on the side away from the cover plate body; the side of the sealing area near the cover plate body is at a height equal to the highest point of the positioning part on the side near the cover plate body.

[0012] Furthermore, in the first direction, the side of the sealing area away from the cover plate body is at a height equal to the highest point of the positioning part away from the cover plate body; the side of the sealing area near the cover plate body is at a height equal to the side of the connecting part near the cover plate body.

[0013] Furthermore, the sealing area is a region recessed in a second direction relative to the connecting portion, which, when fitted together, fixes the relative positions of the sealing pin and the top cover.

[0014] Furthermore, the sealing area includes a sealing horizontal section and a sealing transition section located around the sealing horizontal section. The sealing transition section is connected to the positioning part. The injection area includes an injection horizontal section and an injection transition section located around the injection horizontal section. The injection transition section is connected to the protruding structure. The injection hole is located on the injection horizontal section. The sealing horizontal section is used to cover the injection hole and is parallel to the injection horizontal section.

[0015] The sealing transition section and the sealing horizontal section form a first included angle, and the injection transition section and the injection horizontal section form a second included angle. The first included angle is greater than the second included angle, and both the first included angle and the second included angle are greater than 90°.

[0016] Furthermore, the height of the protrusion structure in the first direction is 0.3-1.0 mm; and / or,

[0017] The protruding structure is annular and surrounds the injection hole.

[0018] Based on the same inventive concept, this utility model also provides a battery cell, comprising:

[0019] Cover plate assembly as described above;

[0020] The outer casing, the cover plate assembly is connected to the outer casing and forms a receiving space, and the injection hole is in communication with the receiving space.

[0021] As can be seen from the above description, the cover plate assembly and battery cell provided by this utility model have a raised structure on the main body of the cover plate. The sealing nail includes a connecting area and a sealing area. The sealing area is used to cover the injection hole on the main body of the cover plate, and the connecting part of the connecting area is used to connect with the main body of the cover plate. The connecting area also has a positioning part that cooperates with the raised structure on the main body of the cover plate. That is, the cooperation between the raised structure and the positioning part can realize the rapid positioning of the top cover and the sealing nail, thereby improving the welding efficiency of the sealing nail and the top cover. In addition, the sealing effect of the sealing nail on the injection hole on the top cover is achieved by welding the connecting part of the sealing nail to the main body of the cover plate. During the welding process, the corresponding area on the connecting part and the main body of the cover plate is the welding area. The positioning part is the dividing line between the welding area and the sealing area, which facilitates the rapid determination of the welding area and further improves the welding efficiency. Moreover, the raised structure on the main body of the cover plate separates the welding area from the injection hole, which can effectively prevent welding spatter from entering the injection hole and ensure the welding effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of the battery cell of this utility model;

[0024] Figure 2 This is a top view of the battery cell of this utility model.

[0025] Figure 3 for Figure 2 Schematic diagram of a partial cross-section along the AA direction. Figure 1 ;

[0026] Figure 4 for Figure 2 Schematic diagram of a partial cross-section along the AA direction. Figure 2 ;

[0027] Figure 5 for Figure 2 Schematic diagram of a partial cross-section along the AA direction. Figure 3 ;

[0028] Figure 6 for Figure 2 Schematic diagram of a partial cross-section along the AA direction. Figure 4 ;

[0029] In the above diagram, the X-arrow indicates the first direction, and the Y-arrow indicates the second direction;

[0030] In the diagram, 001 is the cover plate assembly; 002 is the outer shell; 100 is the top cover; 110 is the cover plate body; 111 is the first plate surface; 112 is the second plate surface; 113 is the raised structure; 120 is the injection area; 121 is the horizontal injection section; 122 is the injection transition section; 123 is the injection hole; 130 is the groove; 200 is the sealing pin; 210 is the connection area; 211 is the connection part; 212 is the positioning part; 220 is the sealing area; 221 is the horizontal sealing section; 222 is the sealing transition section; 300 is the electrolyte buffer space; and 400 is the clearance. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] In related technologies, such as Figure 1 As shown, the battery cell includes a cover plate assembly 001 and a housing 002. The cover plate assembly 001 is connected to the housing 002, forming a receiving space. A bare battery cell is disposed within the receiving space. The electrolyte injection hole 123 on the cover plate assembly 001 communicates with the receiving space to inject electrolyte into the receiving space. After the electrolyte is injected, the top cover 100 needs to be welded to the sealing pin 200 to seal the electrolyte injection hole 123. However, if the sealing pin 200 cannot be quickly placed in a suitable position outside the electrolyte injection hole 123, or if the welding area cannot be quickly determined during the welding process, the welding efficiency between the sealing pin 200 and the top cover 100 will be affected. In addition, if welding spatter enters the electrolyte injection hole 123 during the welding process, it will contaminate the electrolyte, thereby affecting the service life of the battery cell. That is, if welding spatter enters the electrolyte injection hole 123, it will affect the welding effect between the sealing pin 200 and the top cover 100.

[0034] Based on the above issues, the applicant discovered that by providing a protruding structure 113 on the top cover 100 and a corresponding positioning part 212 on the sealing nail 200, the top cover 100 and the sealing nail 200 can be quickly positioned through the cooperation of the protruding structure 113 and the positioning part 212. This positioning function continues throughout the entire welding process, effectively improving welding efficiency. Furthermore, the positioning part 212 serves as the boundary between the welding area of ​​the sealing nail 200 and the sealing area 220, allowing welders to quickly position the welding area of ​​the sealing nail 200, further improving welding efficiency. Additionally, the protruding structure 113 separates the welding area of ​​the top cover 100 from the injection hole 123, effectively preventing welding spatter from entering the injection hole 123, thus ensuring welding quality.

[0035] The following describes specific embodiments in conjunction with... Figures 1-6 The technical solution of this application will be described in detail below.

[0036] In view of this, such as Figure 1 , Figure 2 , Figure 3 As shown, in some embodiments, a cover plate assembly 001 includes:

[0037] Top cover 100 includes a cover plate body 110 and an injection hole 123 penetrating the cover plate body 110; the cover plate body 110 is provided with a first direction (i.e. Figure 3 The cover plate body 110 includes a protruding structure 113 protruding in the X direction; wherein, the cover plate body 110 includes a first plate surface 111 and a second plate surface 112 disposed opposite to each other, and the first direction is the direction in which the second plate surface 112 faces the first plate surface 111;

[0038] The sealing pin 200 includes a connecting area 210 and a sealing area 220. The connecting area 210 is connected to the periphery of the sealing area 220. The connecting area 210 includes a connecting part 211 and a positioning part 212 that cooperates with the protruding structure 113. The positioning part 212 is connected to the sealing area 220. The connecting part 211 is connected to the first plate surface 111 of the cover plate body 110. The sealing area 220 is used to cover the injection hole 123.

[0039] The top cover 100 and the sealing nail 200 can both be made of stainless steel. This stainless steel material can reduce the weight of the battery cell while ensuring the strength of the top cover 100 and the sealing nail 200, and can also ensure the welding yield and welding strength of the sealing nail 200 and the top cover 100.

[0040] The thickness of the sealing stud 200 is less than the thickness of the top cover 100 to reduce the weight load exerted by the sealing stud 200 on the top cover 100. Specifically, the thickness of the top cover 100 ranges from 0.30 to 3.0 mm, and more preferably, the thickness of the top cover 100 ranges from 0.5 to 0.8 mm. The thickness of the sealing stud 200 ranges from 0.1 to 2 mm, and more preferably, the thickness of the sealing stud 200 ranges from 0.2 to 0.5 mm.

[0041] The connecting part 211 of the sealing nail 200 is welded and fixed to the cover plate body 110 surrounding the injection hole 123 of the top cover 100. To ensure the welding strength, such as Figure 4 As shown, the width L1 of the connecting portion 211 must be at least 0.8-2 mm, and the connecting portion 211 must not be too close to the injection hole 123 to avoid welding spatter entering the injection hole 123 and contaminating the electrolyte in the cell casing. Therefore, when both the sealing pin 200 and the injection hole 123 are circular, the diameter of the sealing pin 200 can be set to 3-4 times the diameter of the injection hole 123 to ensure that the connecting portion 211 located at the edge of the sealing pin 200 is as far away from the injection hole 123 as possible, and to ensure the connection width between the connecting portion 211 and the cover plate body 110. This ensures both the welding strength between the top cover 100 and the sealing pin 200 and prevents welding spatter from entering the injection hole 123 and contaminating the electrolyte in the cell casing 002, thus affecting the welding effect. Specifically, the diameter of the sealing pin 200 is in the range of 8-12 mm; the diameter of the injection hole 123 is in the range of 2-4 mm.

[0042] The top cover 100 has a protruding structure 113 on its main body 110, which protrudes in a first direction. The connecting area 210 of the sealing nail 200 has a positioning part 212 recessed in the first direction. The protruding structure 113 is located within the positioning part 212. The two can be fitted together, for example, by snap-fit ​​or abutment. The fit between the protruding structure 113 and the positioning part 212 fixes the relative position of the sealing nail 200 and the top cover 100, thus achieving pre-positioning of the top cover 100 and the sealing nail 200 and improving the welding efficiency of the sealing nail 200 and the top cover 100. Specifically, the height of the protruding structure 113 ranges from 0.2 to 1.0 mm, and the depth of the corresponding positioning part 212 ranges from 0.25 to 1.05 mm; the reserved assembly gap is 0.05 to 0.1 mm. In addition, the connection area between the protruding structure 113 and the first plate surface 111 is an arc-shaped transition area with a radius of 0.05-5mm, and can be further 0.2-0.5mm.

[0043] In addition, the protruding structure 113 can be an annular structure surrounding the injection hole 123, or multiple protruding structures 113 can be provided, which surround the injection hole 123; correspondingly, the positioning part 212 can be an annular structure that cooperates with the protruding structure 113, or multiple positioning parts 212 can be provided, which correspond to and cooperate with the multiple protruding structures 113 one by one.

[0044] In this embodiment, the cover plate body 110 of the top cover 100 is provided with a protruding structure 113, and the sealing nail 200 includes a connecting area 210 and a sealing area 220. The sealing area 220 is used to cover the injection hole 123 on the cover plate body 110. The connecting part 211 of the connecting area 210 is used to connect with the cover plate body 110. The connecting area 210 is also provided with a positioning part 212 that cooperates with the protruding structure 113 on the cover plate body 110. That is, the cooperation between the protruding structure 113 and the positioning part 212 can realize the rapid positioning of the top cover 100 and the sealing nail 200, so as to improve the welding efficiency of the sealing nail 200 and the top cover 100. Furthermore, the sealing effect of the sealing pin 200 on the injection hole 123 on the top cover 100 is achieved by welding the connecting part 211 of the sealing pin 200 to the cover plate body 110. During the welding process, the corresponding area on the connecting part 211 and the cover plate body 110 is the welding area. The positioning part 212 is the boundary line between the welding area and the sealing area 220, which facilitates the quick determination of the welding area and further improves welding efficiency. Moreover, the protruding structure 113 on the cover plate body 110 separates the welding area from the injection hole 123, which can effectively prevent welding spatter from entering the injection hole 123 and ensure the welding effect.

[0045] In addition, the cooperation between the protruding structure 113 and the positioning part 212 adds another layer of sealing on the basis of the welding seal between the top cover 100 and the sealing nail 200, which can effectively improve the sealing effect of the sealing nail 200 on the injection hole 123 of the top cover 100.

[0046] In some embodiments, such as Figure 3-5 As shown, the cover plate body 110 is also provided with a second direction relative to the cover plate body 110 (i.e., Figure 3 An injection area 120 is recessed in the Y direction, and an injection hole 123 is located within the injection area 120; an electrolyte buffer space 300 is formed between the sealing area 220 and the injection area 120.

[0047] The second direction is opposite to the first direction.

[0048] Specifically, in the first direction, the side of the sealing area 220 away from the cover plate body 110 is higher than or equal to the side of the connecting portion 211 away from the cover plate body 110; the side of the sealing area 220 near the cover plate body 110 is higher than or equal to the side of the connecting portion 211 near the cover plate body 110. This description includes... Figure 3 , Figure 4 , Figure 5 Three scenarios.

[0049] like Figure 3 As shown, in the first direction, the side of the sealing area 220 away from the cover plate body 110 is equal to or higher than the side of the connecting portion 211 away from the cover plate body 110; the side of the sealing area 220 near the cover plate body 110 is equal to or higher than the side of the connecting portion 211 near the cover plate body 110. That is, the connecting portion 211 and the sealing area 220 have the same thickness and are on the same horizontal plane, and the positioning portion 212 is specifically an annular groove.

[0050] like Figure 4 As shown, in the first direction, the side of the sealing area 220 away from the cover plate body 110 is at the same height as the highest point (e.g., point M) on the side of the positioning part 212 away from the cover plate body 110; the side of the sealing area 220 near the cover plate body 110 is at the same height as the highest point (e.g., point N) on the side of the positioning part 212 near the cover plate body 110; that is, the connecting part 211 and the sealing area 220 are of the same thickness, and the sealing area 220 is set higher than the connecting part 211. The positioning part 212 is specifically an annular mounting plate.

[0051] like Figure 5 As shown, in the first direction, the side of the sealing area 220 away from the cover plate body 110 is at the same height as the highest point (e.g., point M) of the positioning part 212 on the side away from the cover plate body 110; the side of the sealing area 220 near the cover plate body 110 is at the same height as the side of the connecting part 211 near the cover plate body 110. That is, the thickness of the sealing area 220 is greater than the thickness of the connecting part 211, and the positioning part 212 is specifically an annular groove.

[0052] In either case, an electrolyte buffer space 300 will be formed between the sealing area 220 and the electrolyte injection area 120. This electrolyte buffer space 300 increases the electrolyte storage space, effectively extending the battery cell's lifespan. For batteries of the same size, Figure 4 The maximum electrolyte buffer space formed is 300, which means it can store the most electrolyte. Figure 5 The thickness of the sealing area 220 corresponding to the formed electrolyte buffer space 300 is the largest, which can effectively enhance the sealing effect of the sealing nail 200 on the injection hole 123. Figure 3 The formed electrolyte buffer space 300 and Figure 5 The formed electrolyte buffer space is the same at 300, but Figure 3 The sealing area 220 is relatively Figure 5 The sealing area is 220mm thin, which can effectively reduce the weight of the battery cell; Figure 3 , Figure 5 The positioning part 212 formed in the middle is specifically an annular groove, which is most stable when it cooperates with the protruding structure 113, and can effectively enhance the sealing effect of the sealing nail 200 on the injection hole 123; in addition, in the first direction, the height of the sealing area 220 is lower than the height of the positioning part 212, so as to avoid the sealing area 220 being directly impacted by external forces. That is, the positioning part 212 can protect the sealing area 220, and then protect the injection area 120 covered by the sealing area 220.

[0053] In some embodiments, such as Figure 3 As shown, the second plate surface 112 is provided with a groove 130 recessed in the first direction. The groove 130 is annular or there may be multiple grooves. The annular groove 130 or multiple grooves 120 surround the injection area 120. Because the injection area 120 is recessed in the second direction relative to the cover plate body 110, the connection section between the cover plate body 110 and the injection area 120 is prone to large stress. The groove 130 releases the stress in the connection section to ensure the strength and stability of the top cover 100.

[0054] In some embodiments, such as Figure 6 As shown, the sealing area 220 is in the second direction relative to the connecting portion 211 (i.e., Figure 6 In the recessed area (Y direction) of the liquid injection area 120, the sealing area 220 cooperates with the liquid injection area 120 to fix the relative position of the sealing pin 200 and the top cover 100. That is, in this embodiment, the electrolyte buffer zone 300 is no longer formed between the sealing area 220 and the liquid injection area 120. Instead, there is a welded seal between the connecting part 211 and the cover plate body 110, and a second mating seal between the positioning part 212 and the protruding structure 113. This adds a third mating seal between the sealing area 220 and the liquid injection area 120. The above three seals can effectively improve the sealing performance of the sealing pin 200 to the liquid injection hole 123.

[0055] Specifically, the sealing area 220 includes a sealing horizontal section 221 and a sealing transition section 222 located around the sealing horizontal section 221. The sealing transition section 222 is connected to the positioning part 212. The injection area 120 includes an injection horizontal section 121 and an injection transition section 122 located around the injection horizontal section 121. The injection transition section 122 is connected to the protruding structure 113. The injection hole 123 is located on the injection horizontal section 121. The sealing horizontal section 221 is used to cover the injection hole 123 and is parallel to the injection horizontal section 121.

[0056] A clearance 400, 0.5–1 mm in size, is provided between the sealing horizontal section 221 and the injection horizontal section 121. A first angle α is formed between the sealing transition section 222 and the sealing horizontal section 221, and a second angle β is formed between the injection transition section 122 and the injection horizontal section 121. The first angle α is greater than the second angle β. This clearance and the fact that the first angle α is greater than the second angle β provide a tolerance for the installation of the sealing pin 200 onto the top cover 100, reducing the assembly time of the sealing pin 200 on the top cover 100 and thus improving the assembly efficiency of the sealing pin 200 on the top cover 100.

[0057] In addition, such as Figure 5 , Figure 6 As shown, both the first included angle α and the second included angle β are greater than 90°, indicating that the bending angles of the sealing horizontal section 221 relative to the sealing transition section 222 and the injection horizontal section 121 relative to the injection transition section 122 are relatively large, which can effectively reduce the bending stress between the sealing horizontal section 221 and the sealing transition section 222, as well as the bending stress between the injection horizontal section 121 and the injection transition section 122.

[0058] In some embodiments, the roughness of the side of the connecting portion 211 away from the cover plate body 110 is greater than or equal to 0.4 μm. It should be noted that welding the sealing nail 200 to the cover plate body 110 typically uses laser welding. During laser welding, if the surface of the sealing nail 200 (especially the surface of the connecting portion 211) is smooth, the absorption rate of the laser is low, resulting in a large amount of laser light being reflected, i.e., a "high reflection phenomenon." This reflected laser light can re-enter the output head of the welding equipment, and even some of the reflected light can couple into the energy transmission fiber, propagating in the reverse direction along the fiber to the laser's interior, causing the core components inside the laser to maintain a high temperature, thereby affecting the welding effect and equipment lifespan. Therefore, the roughness of the surface of the connecting portion 211 can be increased. This surface roughness can be achieved through grinding, embossing, passivation, matte finishing, etc., to avoid the high reflection phenomenon during welding of the sealing nail 200 to the cover plate body 110.

[0059] One type of battery cell, such as Figure 1 As shown, it includes:

[0060] The cover plate assembly 001 as described above;

[0061] The outer casing 002, the cover plate assembly 001 is connected to the outer casing 002 and forms a receiving space, and the liquid injection hole 123 is in communication with the receiving space.

[0062] The beneficial effects of the battery cell are the same as those of the cover plate assembly 001 described above, and will not be repeated here.

[0063] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the scope of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity.

[0064] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cover plate assembly, characterized in that, include: The top cover includes a cover plate body and an injection hole that penetrates the cover plate body; the cover plate body is provided with a protruding structure that protrudes in a first direction; wherein, the cover plate body includes a first plate surface and a second plate surface that are disposed opposite to each other, and the first direction is the direction in which the second plate surface faces the first plate surface; The sealing pin includes a connecting area and a sealing area. The connecting area is connected to the periphery of the sealing area. The connecting area includes a connecting part and a positioning part that cooperates with the protruding structure. The positioning part is connected to the sealing area. The connecting part is connected to the first plate surface of the cover plate body. The sealing area is used to cover the injection hole.

2. The cover plate assembly according to claim 1, characterized in that, The cover plate body is also provided with a liquid injection area that is recessed in a second direction relative to the cover plate body, and the liquid injection hole is located in the liquid injection area; an electrolyte buffer space is formed between the sealing area and the liquid injection area; The second direction is opposite to the first direction.

3. The cover plate assembly according to claim 2, characterized in that, The second plate surface is provided with a groove that is recessed in the first direction, and the groove is located around the injection area.

4. The cover plate assembly according to claim 2, characterized in that, In the first direction, the side of the sealing area away from the cover plate body is equal to or higher than the side of the connecting portion away from the cover plate body; the side of the sealing area near the cover plate body is equal to or higher than the side of the connecting portion near the cover plate body.

5. The cover plate assembly according to claim 2, characterized in that, In the first direction, the side of the sealing area away from the cover plate body is at the same height as the highest point of the positioning part on the side away from the cover plate body; the side of the sealing area near the cover plate body is at the same height as the highest point of the positioning part on the side near the cover plate body.

6. The cover plate assembly according to claim 2, characterized in that, In the first direction, the side of the sealing area away from the cover plate body is at the same height as the highest point of the positioning part away from the cover plate body; the side of the sealing area near the cover plate body is at the same height as the side of the connecting part near the cover plate body.

7. The cover plate assembly according to claim 2, characterized in that, The sealing area is a region that is recessed in a second direction relative to the connecting portion. The sealing area cooperates with the injection area to fix the relative positions of the sealing pin and the top cover.

8. The cover plate assembly according to claim 7, characterized in that, The sealing area includes a sealing horizontal section and a sealing transition section located around the sealing horizontal section. The sealing transition section is connected to the positioning part. The injection area includes an injection horizontal section and an injection transition section located around the injection horizontal section. The injection transition section is connected to the protruding structure. The injection hole is located on the injection horizontal section. The sealing horizontal section is used to cover the injection hole and is parallel to the injection horizontal section. The sealing transition section and the sealing horizontal section form a first included angle, and the injection transition section and the injection horizontal section form a second included angle. The first included angle is greater than the second included angle; and both the first included angle and the second included angle are greater than 90°.

9. The cover plate assembly according to claim 1, characterized in that, The height of the protrusion in the first direction is 0.3-1.0 mm; and / or, The protruding structure is annular and surrounds the injection hole.

10. A battery cell, characterized in that, include: The cover plate assembly as described in any one of claims 1 to 9; The outer casing, the cover plate assembly is connected to the outer casing and forms a receiving space, and the injection hole is in communication with the receiving space.

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