Battery cell cover plate

Abstract

The utility model provides a battery cell cover plate which comprises a cover plate assembly provided with an electrode mounting area; the conductive block is arranged in the electrode mounting area and is matched with the electrode mounting area; a containing groove is formed in the side, away from the cover plate assembly, of the conductive block. The pole penetrates through the cover plate assembly and the conductive block, and part of the pole is located in the containing groove; a limiting end is arranged at the bottom of the pole and is propped against the bottom of the cover plate assembly; the limiting component is arranged in the containing groove and abuts against the bottom of the containing groove; a limiting groove is formed in the pole along the circumferential direction of the pole, and the limiting part is embedded in the limiting groove; the position of the pole is limited through the limiting end at the bottom end of the pole and the limiting part embedded in the limiting groove, so that the firmness of the pole on the cover plate assembly and the reliability of connection between the pole and the conductive block are improved, the bearing capacity of the pole is enhanced, the risk that the pole falls off is reduced, the quality of a battery cell is improved, and the service life of the battery cell is prolonged. And the service life of the battery cell is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery cell, in particular to a battery cell cover plate. BACKGROUND

[0002] The battery cell cover plate is an important component of the square can battery cell, which has the functions of electrical connection, safety protection, battery sealing and battery information identification, and is one of the key components to ensure the performance and safety of the battery cell. The cover plate assembly of the battery cell cover plate is usually provided with an aluminum conductive block and a pole, wherein the pole is usually connected with the conductive block of the cover plate assembly by a riveting process to upset the top end of the pole and clamp it in the stepped hole of the conductive block; however, since the pole is usually formed of pure copper or other materials, the riveting process cannot guarantee that the pole is completely filled in the stepped hole of the conductive block due to the influence of physical properties such as hardness and ductility, resulting in relatively low connection firmness of the pole and the conductive block, and the risk of pole falling off and causing battery cell failure. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to provide a battery cell cover plate to solve the above-mentioned technical problems.

[0004] In order to achieve the above purpose, the present application provides a battery cell cover plate, which comprises:

[0005] A cover plate assembly is provided with an electrode mounting area;

[0006] A conductive block is provided in the electrode mounting area and is adapted to the electrode mounting area; a containing groove is formed on the side of the conductive block away from the cover plate assembly;

[0007] A pole penetrates through the cover plate assembly and the conductive block, and part of the pole is located in the containing groove; a limiting end is provided at the bottom of the pole, and the limiting end abuts against the bottom of the cover plate assembly;

[0008] A limiting component is provided in the containing groove and abuts against the bottom of the containing groove; a limiting groove is formed along the circumference of the pole, and the limiting component is embedded in the limiting groove.

[0009] As can be seen from the above, the battery cell cover plate provided by the present application can limit the position of the pole by the limiting end of the bottom end of the pole and the limiting component embedded in the limiting groove of the pole, improve the firmness of the pole installation in the cover plate assembly, and the reliability of the connection between the pole and the conductive block, enhance the carrying capacity of the pole, reduce the risk of pole falling off, and improve the quality of the battery cell and prolong the service life of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description only embody the embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0011] Figure 1 It is a top view of the battery cell cover plate in the related art.

[0012] Figure 2 It is a sectional view of the battery cell cover plate in the related art.

[0013] Figure 3 It is a structural schematic diagram of the pole in the application.

[0014] Figure 4 It is a top view of the first battery cell cover plate in the application.

[0015] Figure 5 It is a partial exploded view of the first battery cell cover plate in the application.

[0016] Figure 6 It is a whole exploded view of the first battery cell cover plate in the application.

[0017] Figure 7 It is a sectional view of the first battery cell cover plate in the application.

[0018] Figure 8 It is a structural schematic diagram of the clamp spring in the application.

[0019] Figure 9 It is a top view of the second battery cell cover plate in the application.

[0020] Figure 10 It is a partial exploded view of the second battery cell cover plate in the application.

[0021] Figure 11 It is a whole exploded view of the second battery cell cover plate in the application.

[0022] Figure 12 It is a sectional view of the second battery cell cover plate in the application.

[0023] Figure 13 It is a structural schematic diagram of the stopper in the application.

[0024] Figure 14 It is a top view of the battery cell cover plate with four stoppers in the application.

[0025] Explanation of reference signs:

[0026] 100, cover plate assembly; 101, first insulating layer; 102, cover plate body; 103, second insulating layer;

[0027] 200, conductive block; 201, accommodating groove;

[0028] 300, pole; 301, limiting groove; 302, limiting end;

[0029] 401, clamping spring; 402, stop block; 4021, clamping part;

[0030] 501, weld;

[0031] 601, electrode pin; 602, stepped hole; 603, sealing ring; 604, explosion-proof valve; 605, liquid injection hole. DETAILED DESCRIPTION

[0032] To make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connection, but can include electrical connection, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0034] The embodiments of the present application will be described in detail below with reference to the drawings.

[0035] The electric core cover plate is an important component of the square shell electric core. In the related art, as shown in Figure 1 and Figure 2 , Figure 1 is a top view of the electric core cover plate in the related art, Figure 2For the sectional view of the related art cell cover plate, the cover plate assembly 100 of the cell cover plate is usually provided with an aluminum conductive block 200 and a pole 300. When the pole 300 is assembled in the cover plate assembly 100, the pole 300 is usually arranged in the stepped hole of the conductive block 200, the top end of the pole 300 is upset by riveting process, so that the top end of the pole 300 expands and extends to the surrounding of the stepped hole, so that the pole 300 is clamped in the stepped hole and connected with the conductive block 200.

[0036] However, the applicant finds that since the material of the cell pole 300 is usually formed of metal material, for example, the negative pole 300 is usually formed of pure copper, due to the hardness and ductility of the material of the pole 300, it is difficult to ensure that the top end of the pole 300 completely fills the stepped hole of the conductive block 200 by riveting process, that is, the part of the pole 300 upset is difficult to hang the stepped part of the stepped hole, so the connection between the pole 300 and the conductive block 200 is relatively poor, and the carrying capacity of the pole 300 along the extension direction of the longitudinal direction is weak, in the cell cycle process, there is a risk that the pole 300 falls off and causes the cell to fail, affecting the overall quality and service life of the cell.

[0037] Therefore, the present application provides a cell cover plate, which comprises a cover plate assembly 100, a conductive block 200, a pole 300 and a limiting part; the cover plate assembly 100 is provided with an electrode mounting area; the conductive block 200 is arranged in the electrode mounting area and matched with the electrode mounting area; the side of the conductive block 200 away from the cover plate assembly 100 is provided with a containing groove 201; the pole 300 penetrates the cover plate assembly 100 and the conductive block 200, and part of the pole 300 is located in the containing groove 201; the bottom of the pole 300 is provided with a limiting end 302, which abuts against the bottom of the cover plate assembly 100; the limiting part is arranged in the containing groove 201 and abuts against the bottom of the containing groove 201; the pole 300 is provided with a limiting groove 301 along the circumference of the pole 300, and the limiting part is embedded in the limiting groove 301.

[0038] Specifically, please refer to Figure 3 , Figure 4 and Figure 9 ; wherein, Figure 3 is the structure diagram of the pole 300 in the present application, Figure 4 is the top view of the first cell cover plate in the present application, Figure 9 is the top view of the second cell cover plate in the present application.

[0039] The present application provides a cell cover plate, such as Figure 3 , Figure 4 and Figure 9As shown, the cell cover plate comprises a cover plate assembly 100, a conductive block 200, and a pole 300; the cover plate assembly 100 is provided with an electrode mounting area, the conductive block 200 is arranged in the electrode mounting area and is adapted to the electrode mounting area, so that the cover plate assembly 100 serves as a bearing body for providing mounting positions for the conductive block 200 and the pole 300, and can also seal and protect the electrode assembly (including the positive electrode sheet, the negative electrode sheet and the separator, not marked in the figure) in the cell; the conductive block 200 is provided with a containing groove 201 on the side away from the cover plate assembly 100, and the pole 300 penetrates through the cover plate assembly 100 and the conductive block 200 and makes part of the pole 300 located in the containing groove 201; since the pole 300 penetrates through the conductive block 200 and contacts the conductive block 200, the conductive block 200 can serve as a wiring area of the cell assembly and make the wiring area have sufficient area to facilitate the electrical connection with the external circuit structure; in addition, since the bottom end of the pole 300 is provided with a limiting end 302 abutting against the cover plate assembly 100, the pole 300 penetrating through the cover plate assembly 100 and the conductive block 200 can be limited, and the position of the bottom end of the pole 300 on the surface of the cover plate assembly 100 is limited to prevent the pole 300 from being pulled out of the cover plate assembly 100 and the conductive block 200 during installation.

[0040] As for the cell cover plate, the cell cover plate further comprises a limiting component, which is arranged in the containing groove 201 and abuts against the bottom of the containing groove 201, wherein the pole 300 is provided with a limiting groove 301 along the circumference thereof, and the limiting component can be embedded in the limiting groove 301 and protrude relative to the surface of the pole 300; as shown in Figure 3 、 Figure 4 and Figure 9 , by providing the limiting groove 301 along the circumference of the pole 300, a mounting position is provided for the limiting component, so that after the limiting component is embedded in the limiting groove 301, it abuts against the bottom of the containing groove 201; at this time, the limiting component can limit the part of the pole 300 located in the containing groove 201, and in cooperation with the limiting end 302 arranged at the bottom end of the pole 300, the position of the pole 300 on the cover plate assembly 100 and the conductive block 200 can be limited, so that the pole 300 and the conductive block 200 have a good connection relationship, and the firmness and reliability of the installation of the pole 300 on the cover plate assembly 100 are improved.

[0041] In addition, since the conductive block 200 is provided with the containing groove 201, and part of the pole 300 and the limiting component are located in the containing groove 201, when the limiting component is used to limit the pole 300, the containing groove 201 can provide sufficient operation space for the pole 300 and the limiting component, so as to reduce the installation difficulty of the limiting component on the pole 300.

[0042] In summary, the electric cell cover plate provided by the application can limit the pole column 300 through the limiting end 302 at the bottom end of the pole column 300 and the limiting component embedded in the limiting groove 301 of the pole column 300, improve the firmness of the pole column 300 in the installation of the cover plate assembly 100, improve the reliability of the connection between the pole column 300 and the conductive block 200, enhance the carrying capacity of the pole column 300, reduce the risk of the pole column 300 falling off, and be conducive to improving the quality of the electric cell. In addition, by adding the limiting groove 301 and the limiting end 302 to the pole column 300 and limiting and installing the pole column 300 by using the limiting component, the installation difficulty of the pole column 300 can be reduced, the damage degree of the pole column 300 can be reduced, the assembly cost of the electric cell can be controlled, and the service life of the electric cell can be prolonged.

[0043] In some embodiments, the limiting component includes a circlip 401 arranged around the pole column 300 and embedded in the limiting groove 301. The circlip 401 is matched with the limiting groove 301, and the bottom of the circlip 401 abuts against the bottom of the accommodating groove 201.

[0044] Specifically, please refer to Figures 4-8 , Figure 4 is a top view of the first electric cell cover plate in the application, Figure 5 is a partial exploded view of the first electric cell cover plate in the application, Figure 6 is an overall exploded view of the first electric cell cover plate in the application, Figure 7 is a sectional view of the first electric cell cover plate in the application, Figure 8 is a structural schematic view of the circlip 401 in the application.

[0045] As for the limiting component, by opening the limiting groove 301 on the surface of the pole column 300 and embedding the limiting component in the limiting groove 301, the pole column 300 is installed in the cover plate assembly 100 and the conductive block 200 through the limiting component arranged on the pole column 300 and the limiting end 302 at the bottom end of the pole column 300, the firmness of the pole column 300 in the installation of the cover plate assembly 100 is improved, and the reliability of the connection between the pole column 300 and the conductive block 200 is enhanced. Specifically as Figures 4-8As shown, the limiting component can include a circlip 401 which can be arranged around the pole column 300 and embedded in the limiting groove 301. Since the circlip 401 is matched with the limiting groove 301, when the circlip 401 is embedded in the limiting groove 301, the circlip 401 can be firmly embedded in the limiting groove 301. When the circlip 401 is installed, the bottom of the circlip 401 abuts against the bottom of the accommodating groove 201. At this time, the pole column 300 can be limited to restrict the position of the pole column 300 on the cover plate assembly 100 and the conductive block 200, improve the firmness of the installation of the pole column 300 on the cover plate assembly 100, enhance the reliability of the connection between the pole column 300 and the conductive block 200, improve the carrying capacity of the pole column 300, and avoid the pole column 300 from falling off in the long-term cycle process of the battery cell. In addition, by adding the limiting groove 301 to the pole column 300 and combining the use of the circlip 401 to limit and install the pole column 300, the installation difficulty of the pole column 300 on the cover plate assembly 100 can be reduced, the damage degree of the pole column 300 can be reduced, and the quality and service life of the battery cell can be improved.

[0046] For example, the process of installing the pole column 300 by using the circlip 401 is described in detail in combination with the above-mentioned embodiments. Figure 5 As shown, when the pole column 300 is installed by using the circlip 401, a sealing ring 603 can be sleeved on the pole column 300, which is used for sealing and electrically insulating the installed pole column 300, improving the air tightness of the battery cell, and preventing the pole column 300 from being short-circuited with part of the structure in the cover plate assembly 100. The conductive block 200 is installed in the electrode installation area of the cover plate assembly 100, and then the pole column 300 is sequentially penetrated through the cover plate assembly 100 and the conductive block 200, so that the limiting end 302 at the bottom end of the pole column 300 is located below the cover plate assembly 100. The pressure mechanism is used to press the bottom of the pole column 300, so that the compression amount of the sealing ring 603 reaches 30%-45%. At this time, the circlip 401 is pried open by using an auxiliary tool, and then the circlip 401 is sleeved into the limiting groove 301 of the pole column 300. After the tool is loosened, the circlip 401 is elastically rebounded by itself and clamped into the limiting groove 301, so that the installation of the pole column 300 is completed.

[0047] In some embodiments, the width of the circlip 401 is greater than the width of the limiting groove 301 along the diameter direction of the pole column 300.

[0048] As for the circlip 401, by arranging the circlip 401 around the pole column 300 and embedding it in the clamping groove of the pole column 300, the pole column 300 which is penetrated through the cover plate assembly 100 and the conductive block 200 can be limited and fixed, so as to improve the firmness of the installation of the pole column 300 on the cover plate assembly 100 and enhance the reliability of the connection between the pole column 300 and the conductive block 200. Specifically, as shown in Figure 7As shown, since the snap spring 401 has a ring structure with a notch, when the snap spring 401 is clamped in the limiting groove 301 of the pole column 300, it can be firmly embedded in the limiting groove 301, avoiding the snap spring 401 from falling out of the limiting groove 301 during use; and along the diameter direction of the pole column 300, by setting the width of the snap spring 401 to be greater than the width of the limiting groove 301, the snap spring 401 can be embedded in the limiting groove 301 to form a protruding part relative to the surface of the pole column 300, so as to ensure that the snap spring 401 has sufficient area to abut against the bottom of the accommodation groove 201, and ensure the limiting effect of the snap spring 401 on the pole column 300.

[0049] In some embodiments, the limiting component includes a stopper 402 embedded in the accommodation groove 201 and matched with the accommodation groove 201; the side of the stopper 402 facing the pole column 300 is recessed to provide an engaging part 4021, and at least part of the engaging part 4021 is embedded in the limiting groove 301 and matched with the pole column 300.

[0050] Specifically, please refer to Figures 9-13 , Figure 9 is a top view of the second kind of battery cell cover plate in the present application, Figure 10 is a partial exploded view of the second kind of battery cell cover plate in the present application, Figure 11 is a whole exploded view of the second kind of battery cell cover plate in the present application, Figure 12 is a sectional view of the second kind of battery cell cover plate in the present application, Figure 13 is a structural schematic view of the stopper 402 in the present application.

[0051] As for the limiting component, by opening the limiting groove 301 on the surface of the pole column 300 and embedding the limiting component in the limiting groove 301, the pole column 300 is fixed to the cover plate assembly 100 and the conductive block 200 through the limiting component and the limiting end 302 at the bottom end of the pole column 300, which is beneficial to improve the firmness of the pole column 300 installed in the cover plate assembly 100 and enhance the reliability of the connection between the pole column 300 and the conductive block 200; specifically as Figures 9-13 shown, the limiting component can include a stopper 402, which is matched with the accommodation groove 201 and embedded in the accommodation groove 201, improving the integration and compactness of the stopper 402 and the conductive block 200; as Figure 13As shown, in terms of the stop block 402, one side of the stop block 402 towards the pole column 300 is provided with a clamping portion 4021, and the stop block 402 is assembled in the accommodation groove 201. The clamping portion 4021 can be used as a reserved space for accommodating the pole column 300. Since at least part of the clamping portion 4021 is embedded in the limiting groove 301 and matched with the pole column 300, when the stop block 402 is assembled in the accommodation groove 201 and the clamping portion 4021 is embedded in the limiting groove 301 of the pole column 300, the position of the pole column 300 can be limited by the clamping portion 4021, thereby achieving the fixation of the pole column 300, improving the firmness of the installation of the pole column 300 in the cover plate assembly 100, and enhancing the reliability of the connection between the pole column 300 and the conductive block 200, which is conducive to improving the carrying capacity of the pole column 300 and avoiding the falling of the pole column 300 in the cycle process of the battery cell.

[0052] In addition, by adding the limiting groove 301 to the pole column 300 and combining the application of the stop block 402 to limit the position of the pole column 300, the installation difficulty of the pole column 300 can be reduced, and the damage degree of the pole column 300 can be reduced, which is conducive to improving the quality and service life of the battery cell. At the same time, since the stop block 402 can fill the accommodation groove 201 and cover the pole column 300 inside the accommodation groove 201, the flatness of the conductive block 200 can be improved, which is conducive to improving the delicacy of the appearance of the battery cell.

[0053] Exemplarily, the process of installing the pole column 300 by the stop block 402 is described in detail in combination with the above-mentioned embodiments, such as Figure 13 As shown, when the pole column 300 is installed by the stop block 402, a sealing ring 603 can be sleeved on the pole column 300, which is used for sealing and electrically insulating the installed pole column 300, improving the air tightness of the battery cell, and preventing the pole column 300 from being short-circuited with part of the structure in the cover plate assembly 100. The conductive block 200 is installed in the electrode installation area of the cover plate assembly 100, and then the pole column 300 is sequentially penetrated through the cover plate assembly 100 and the conductive block 200, so that the limiting end 302 at the bottom of the pole column 300 is located below the cover plate assembly 100. The pressure mechanism is used to press the bottom of the pole column 300, so that the compression amount of the sealing ring 603 reaches 20%-45%. At this time, the stop block 402 is inserted into the accommodation groove 201, and the clamping portion 4021 of the stop block 402 is embedded in the limiting groove 301 on the surface of the pole column 300. Then, the conductive block 200 and the stop block 402 are welded and fixed by laser welding, thereby completing the installation of the pole column 300.

[0054] In some embodiments, along the extension direction of the pole column 300, the cross section of the clamping portion 4021 is stepped and matched with the pole column 300 and the limiting groove 301, respectively.

[0055] As for the block 402, by embedding the engaging portion 4021 of the block 402 in the limiting groove 301 of the pole 300, and making the engaging portion 4021 of the block 402 fit the pole 300, the pole 300 penetrating through the cover plate assembly 100 and the conductive block 200 can be limited and fixed, so as to improve the firmness of the pole 300 in the installation of the cover plate assembly 100, and enhance the reliability of the connection between the pole 300 and the conductive block 200; as shown in Figure 13 As the side of the block 402 facing the pole 300 is recessed and provided with the engaging portion 4021 fitting the pole 300, when the block 402 is used to limit the pole 300, the engaging portion 4021 can be embedded in the inside of the limiting groove 301, and the bottom end of the pole 300 is limited by the limiting end 302 to prevent the pole 300 from falling off; along the extension direction of the pole 300, by setting the cross section of the engaging portion 4021 as a stepped shape, and making the engaging portion 4021 fit the pole 300 and the limiting groove 301 respectively, the position of the pole 300 can be limited by the part of the engaging portion 4021 embedded in the limiting groove 301, so as to ensure the reliability of the fixation of the block 402 to the pole 300; and the engaging portion 4021 and the pole 300 abut each other, so as to avoid the existence of a large gap between the pole 300 and the block 402, which affects the delicacy of the whole battery cell.

[0056] In some embodiments, along the extension direction of the pole 300, the height of the block 402 is equal to the height of the accommodating groove 201, so that the side of the block 402 away from the cover plate assembly 100 is flush with the side of the conductive block 200 away from the cover plate assembly 100.

[0057] As for the block 402, as shown in Figure 12 When the block 402 is used to fix and limit the pole 300, along the extension direction of the pole 300, by setting the height of the block 402 equal to the height of the accommodating groove 201, the side of the block 402 away from the cover plate assembly 100, which is assembled in the accommodating groove 201, can be flush with the side of the conductive block 200 away from the cover plate assembly 100, so as to form a relatively flat plane structure, and since the conductive block 200 is the wiring area of the battery cell, the plane structure can provide sufficient wiring area for the battery cell, so as to ensure that the conductive block 200 can be fully connected with the external circuit structure.

[0058] In some embodiments, the block 402 is provided with two, and the two blocks 402 are respectively arranged on the opposite sides of the pole 300 and abut each other; or the block 402 is provided with four, and the four blocks 402 are distributed in a rectangular shape in the accommodating groove 201, and the adjacent two blocks 402 abut each other.

[0059] Specifically, please refer to Figure 14 , Figure 14A top view of the cell cover plate with four stoppers 402 in the present application.

[0060] As for the stopper 402, by embedding the engaging portion 4021 of the stopper 402 in the limiting groove 301 of the pole 300, the pole 300 can be limited and fixed, the firmness of the pole 300 in the installation of the cover plate assembly 100 is improved, and the reliability of the connection between the pole 300 and the conductive block 200 is enhanced. For example, as shown in the figure, in some cases, two stoppers 402 can be assembled in the accommodation groove 201, and the two stoppers 402 are arranged on opposite sides of the pole 300. After the stopper 402 is assembled, the two abut against each other and are embedded in the limiting groove 301 of the pole 300, thereby achieving the fixation and limitation of the pole 300. Since two oppositely arranged stoppers 402 are used, and the engaging portion 4021 is recessed, the force received by the limiting groove 301 of the pole 300 is relatively uniform, avoiding stress concentration and causing the pole 300 to break, and the assembly process is relatively simple. Figure 9 As shown in the figure, in some cases, two stoppers 402 can be assembled in the accommodation groove 201, and the two stoppers 402 are arranged on opposite sides of the pole 300. After the stopper 402 is assembled, the two abut against each other and are embedded in the limiting groove 301 of the pole 300, thereby achieving the fixation and limitation of the pole 300. Since two oppositely arranged stoppers 402 are used, and the engaging portion 4021 is recessed, the force received by the limiting groove 301 of the pole 300 is relatively uniform, avoiding stress concentration and causing the pole 300 to break, and the assembly process is relatively simple.

[0061] Figure 14 As shown in the figure, in some cases, two stoppers 402 can be assembled in the accommodation groove 201, and the two stoppers 402 are arranged on opposite sides of the pole 300. After the stopper 402 is assembled, the two abut against each other and are embedded in the limiting groove 301 of the pole 300, thereby achieving the fixation and limitation of the pole 300. Since two oppositely arranged stoppers 402 are used, and the engaging portion 4021 is recessed, the force received by the limiting groove 301 of the pole 300 is relatively uniform, avoiding stress concentration and causing the pole 300 to break, and the assembly process is relatively simple.

[0062] In some embodiments, the side wall of the accommodation groove 201 and the side wall of the stopper 402 are both provided with a bevel surface (not labeled in the figure) inclined towards the side away from the cover plate assembly 100, and the bevel surface of the accommodation groove 201 and the bevel surface of the stopper 402 are oppositely arranged.

[0063] In the process of limiting and fixing the pole 300 by the stopper 402, in order to improve the firmness of the stopper 402 in fixing the pole 300 and enhance the reliability of the connection between the pole 300 and the conductive block 200, laser welding can be used to reinforce the stopper 402. For example, as shown in the figure, Figure 9 Figure 12 Figure 14 ​​​It can be known that when the limiting component includes the stopper 402, the corresponding bevel faces can be respectively arranged on the side wall of the accommodating groove 201 and the side wall of the stopper 402, and the bevel faces of the side wall of the accommodating groove 201 and the side wall of the stopper 402 are arranged to be inclined towards the side away from the cover plate assembly 100, so that the two bevel faces are combined to form a welding bevel. When the stopper 402 and the conductive block 200 are welded by using the welding bevel, it can be ensured that the connection area of the stopper 402 and the conductive block 200 can be fully penetrated, which is beneficial to improve the quality of the weld 501, reduce the welding residual stress and the deformation degree of the welding area.

[0064] In some embodiments, the cover plate assembly 100 includes a first insulating layer 101, a cover plate body 102 and a second insulating layer 103 which are sequentially stacked and all penetrated by the pole 300; the electrode mounting area is arranged on one side of the cover plate body 102, and the first insulating layer 101 is located between the electrode mounting area, the conductive block 200 and the cover plate body 102; the cover plate body 102 is coincident with the second insulating layer 103 in the orthographic projection of the second insulating layer 103.

[0065] As for the cover plate assembly 100, the cover plate assembly 100 serves as a bearing body of the battery cell, is used for sealing and protecting the electrode assembly in the battery cell, and is also used for providing mounting positions for the pole 300 and the conductive block 200; as shown in Figure 6 、 Figure 7 、 Figure 12 and Figure 13 , the cover plate assembly 100 includes a first insulating layer 101, a cover plate body 102 and a second insulating layer 103 which are sequentially stacked and all penetrated by the pole 300; the electrode mounting area is arranged on one side of the cover plate body 102, and the first insulating layer 101 is located between the electrode mounting area, the conductive block 200 and the cover plate body 102; the cover plate body 102 is coincident with the second insulating layer 103 in the orthographic projection of the second insulating layer 103.

[0066] The first insulating layer 101 and the second insulating layer 103 can be formed of plastic material, which has good insulation, excellent thermal stability and corrosion resistance, and is conducive to prolonging the service life of the battery cell. To reasonably control the cost, the shape of the first insulating layer 101 can be adapted to the shape of the conductive block 200 and the electrode mounting area, and the shape of the second insulating layer 103 can be adapted to the shape of the cover plate body 102. The cover plate body 102 can be formed of aluminum alloy material, which has high hardness and bending resistance, and is conducive to improving the use strength and service life of the cover plate assembly 100.

[0067] In addition, the cover plate assembly 100 is also provided with an explosion-proof valve 604 and a liquid injection hole 605. As shown in Figure 5 and Figure 10 , the explosion-proof valve 604 is arranged on the cover plate assembly 100, which can release the gas generated in the battery cell, and is conducive to regulating the internal pressure and temperature of the battery cell. The liquid injection hole 605 is arranged on the cover plate assembly 100, which can be used as a supplement channel for the electrolyte in the battery cell, so as to supplement the electrolyte.

[0068] In some embodiments, the electrode pin 601 is arranged on the side of the cover plate assembly 100 away from the conductive block 200. The cross section of the electrode pin 601 is L-shaped along the extension direction of the pole column 300. Part of the electrode pin 601 abuts against the cover plate assembly 100, and part of the electrode pin 601 extends in the same direction as the pole column 300. The electrode pin 601 is provided with a stepped hole 602, and the electrode pin 601 is connected with the limiting end 302 of the pole column 300 through the stepped hole 602.

[0069] In terms of the cover plate assembly 100, as shown in Figure 6 、 Figure 7 、 Figure 11 and Figure 12As shown, the electrode pin 601 is arranged on the side of the cover plate assembly 100 away from the conductive block 200, and along the extension direction of the pole column 300, the cross section of the electrode pin 601 can be arranged as an L shape, so that the part of the electrode pin 601 abuts against the cover plate assembly 100 in the same extension direction as the pole column 300, so as to connect the electrode pin 601 with the electrode lug of the electrode assembly during the assembly of the battery cell; the electrode pin 601 can be provided with two, one of which can be connected with the positive electrode lug and the positive electrode pole of the electrode assembly respectively, and the other can be connected with the negative electrode lug and the negative electrode pole of the electrode assembly respectively, at this time, the two electrode pins 601 can be away from each other, which is beneficial to improve the safety of the battery cell during use, reduce the risk of short circuit, and facilitate use and heat dissipation; in addition, the electrode pin 601 is provided with a stepped hole 602, and the electrode pin 601 is connected with the limiting end 302 of the pole column 300 through the stepped hole 602, so as to establish a good electrical connection relationship between the electrode pin 601 and the pole column 300, and also avoid forming a protruding structure on the surface of the pole column 300, so as to prevent the electrode assembly inside the battery cell from being extruded or short-circuited with the electrode assembly.

[0070] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in a different order than those described above and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0071] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be mutually referred to.

[0072] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0073] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and not intended to limit the scope of the application (including the claims) in any way. In fact, various modifications, substitutions, and changes can be suggested by the principles set forth in the application, and they are intended to fall within the scope of the application. The steps in the above embodiments or technical features among different embodiments can be implemented in any order, and there are many other changes to the aspects of the embodiments of the application as described above, which will be apparent to those skilled in the art. For the sake of brevity, they are not provided in detail.

[0074] Although the present application has been described in connection with the preferred embodiments thereof with reference to the drawings, it will be apparent to those skilled in the art that many alternatives, modifications and variations to the preferred embodiments can be made in light of the above description.

[0075] The embodiments of the present application are intended to cover all such alternatives, modifications and variations as falling within the scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An electrode cover plate, characterized by, The utility model relates to a cover plate assembly and electrode installation area, and the electrode installation area is provided with an electrode mounting area, and the electrode mounting area is provided with a conductive block, and the conductive block is provided with a containing groove on the side away from the cover plate assembly, and the containing groove is provided with a limiting component, and the limiting component is embedded in the containing groove. The limiting component comprises a clamping spring or a stop block. The clamping spring is embedded in the limiting groove and is adapted to the limiting groove, and the bottom of the clamping spring abuts against the bottom of the containing groove. The width of the clamping spring is greater than the width of the limiting groove along the diameter direction of the pole column. The stop block is embedded in the containing groove and is adapted to the containing groove, and the side of the stop block facing the pole column is recessed to provide an engaging portion, and at least part of the engaging portion is embedded in the limiting groove and is adapted to the pole column.

2. The cell cover plate of claim 1, wherein, The cross section of the engaging portion is stepped along the extension direction of the pole column and is adapted to the pole column and the limiting groove respectively. The height of the stop block is equal to the height of the containing groove along the extension direction of the pole column, so that the side of the stop block away from the cover plate assembly is flush with the side of the conductive block away from the cover plate assembly.

3. The cell cover plate of claim 2, wherein, The stop block is provided with two stop blocks, and the two stop blocks are arranged on opposite sides of the pole column and abut against each other.

4. The cell cover plate of claim 1, wherein, The stop block is provided with four stop blocks, and the four stop blocks are distributed in a rectangular manner in the containing groove, and adjacent two stop blocks abut against each other. The side wall of the containing groove and the side wall of the stop block are provided with bevel surfaces inclined to the side away from the cover plate assembly, and the bevel surface of the containing groove and the bevel surface of the stop block are oppositely arranged.

5. The cell cover plate of claim 4, wherein, The cover plate assembly comprises a first insulating layer, a cover plate body and a second insulating layer which are stacked in sequence and are penetrated by the pole column, the electrode installation area is arranged on one side of the cover plate body, the first insulating layer is located between the electrode installation area, the conductive block and the cover plate body, and the cover plate body is in the same plane projection as the second insulating layer.

6. The cell cover plate of claim 4, wherein, The side of the cover plate assembly away from the conductive block is provided with an electrode pin, the cross section of the electrode pin is L-shaped along the extension direction of the pole column, part of the electrode pin abuts against the cover plate assembly, and the extension direction of the other part of the electrode pin is the same as the extension direction of the pole column, the electrode pin is provided with a stepped hole, and the electrode pin is connected with the limiting end of the pole column through the stepped hole.

7. The cell cover plate of claim 4, wherein, ​ ​ 8. The cell cover plate of claim 4, wherein, ​ 9. The cell cover plate of claim 1, wherein, ​ 10. The cell cover plate of claim 1, wherein, ​

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