Double-sided self-piercing connecting cover plate and lithium battery

Abstract

The utility model discloses a double -faced self -piercing connecting cover plate and lithium cell, and the self -piercing riveting portion is formed with the pole post both ends respectively, and the self -piercing riveting structure is formed with the adapter piece and the cover plate body cooperation through the self -piercing riveting portion, when carrying out the cover plate assembly, can realize the locking of pole post and adapter piece and cover plate body synchronously, need not gradually connect adapter piece and cover plate body to improve the assembly efficiency, ensure the connecting strength, and need not adopt the rise and expand the connection, and the space in the height direction of cover plate is reduced greatly, improves the compactness of the structure of cover plate and lithium cell.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a double-sided self-piercing lithium battery cover. Background Technology

[0002] In the production and assembly process of existing lithium batteries, the terminals and adapter plates need to be fixedly connected. Laser welding or ultrasonic welding is usually used. However, ultrasonic welding will leave indentations on the surface of the parts, which is not conducive to subsequent welding processes and is prone to producing welding slag, affecting the life and safety of lithium batteries.

[0003] Chinese patent application CN 119581808 A discloses a self-piercing connection structure for a lithium battery terminal and an adapter plate, as well as a lithium battery. In this solution, the first end of the terminal and the adapter plate form a self-locking riveting structure based on a self-piercing form to form a metal cold connection, and the second end of the terminal and the cover plate form a mortise and tenon connection structure.

[0004] However, the self-piercing connection structure provided by the above solution is cumbersome and complex to connect, has low assembly efficiency, and will increase the space in the height direction of the entire cover plate, resulting in a larger overall structure of the lithium battery.

[0005] Therefore, how to effectively improve the connection and assembly efficiency of lithium battery terminals and adapter plates, while ensuring the structural compactness of the cover plate, has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a double-sided self-piercing connection cover and lithium battery with high assembly efficiency and compact structure.

[0007] To achieve the above objectives, the present invention provides a double-sided self-piercing connecting cover plate, comprising a pole, an adapter piece, and a cover plate body. The two ends of the pole are respectively formed with self-piercing riveting portions for cooperating with the cover plate body and the adapter piece, and a self-piercing riveting structure is formed with the cover plate body and the adapter piece based on the self-piercing form.

[0008] Furthermore, the pole includes a pole body, the first end of the pole body is provided with a first self-piercing riveting part, and the second end is provided with a second self-piercing riveting part.

[0009] Furthermore, the first self-piercing riveting part and the second self-piercing riveting part respectively form a stepped distribution structure with the pole body.

[0010] Furthermore, the first self-piercing riveting part and the second self-piercing riveting part are inclined to the outside of the pole body to form an inclined piercing surface, and a piercing cavity is formed inside.

[0011] Furthermore, the first self-piercing riveting part and the second self-piercing riveting part are respectively symmetrically or asymmetrically arranged at both ends of the pole body.

[0012] Furthermore, the adapter piece is provided with a first riveting mating part, the first riveting mating part including a first riveting groove adapted to the first piercing surface of the first self-piercing riveting part, and a first embedding part adapted to the first piercing cavity of the first self-piercing riveting part.

[0013] Furthermore, the cover plate body includes a riveting block, and the riveting block is provided with a second riveting mating part adapted to the second self-piercing riveting part.

[0014] Furthermore, the second riveting mating part includes a second riveting groove adapted to the second piercing surface of the second self-piercing riveting part, and a second embedding part adapted to the second piercing cavity of the second self-piercing riveting part.

[0015] To achieve the above objectives, the lithium battery provided by this utility model includes the aforementioned double-sided self-piercing connecting cover.

[0016] Furthermore, the double-sided self-piercing connection cover plate includes one or two pole posts.

[0017] The double-sided self-piercing connecting cover and lithium battery provided by this utility model have self-piercing riveting parts formed at both ends of the electrode post. The self-piercing riveting parts cooperate with the adapter piece and the cover body to form a self-piercing riveting structure. When assembling the cover, the electrode post can be locked to the adapter piece and the cover body simultaneously, without the need to connect the adapter piece and the cover body step by step, thereby improving assembly efficiency, ensuring connection strength, and eliminating the need for expansion joints. This significantly reduces the space in the height direction of the cover and improves the structural compactness of the cover and the lithium battery. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 An exploded view of the double-sided self-piercing connecting cover plate provided by this utility model;

[0020] Figure 2 A cross-sectional schematic diagram of the double-sided self-piercing connecting cover plate provided by this utility model;

[0021] Figure 3 and Figure 4 This is a schematic diagram of the pole post structure in this utility model;

[0022] Figure 5 This is a schematic diagram of an example of the pole post in this utility model;

[0023] Figure 6 and Figure 7 This is a schematic diagram of the structure of the adapter piece in this utility model;

[0024] Figure 8 This is a schematic diagram of the riveting block in this utility model;

[0025] Figure 9 and Figure 10 This is a schematic diagram of the overall structure of the double-sided self-piercing connecting cover plate in this utility model.

[0026] Figure label:

[0027] 1. Terminal post; 11. Terminal post body; 111. First end; 112. Second end; 12. First self-piercing riveting part; 121. First piercing surface; 122. First piercing cavity; 13. Second self-piercing riveting part; 131. Second piercing surface; 132. Second piercing cavity; 110. Negative terminal post; 120. Positive terminal post;

[0028] 2. Adapter piece; 21. First riveting mating part; 211. First riveting groove; 212. First embedding part; 210. Negative electrode adapter piece; 220. Positive electrode adapter piece;

[0029] 3. Cover plate body; 31. Riveting block; 301. Riveting mating part; 3011. Second riveting groove; 3012. Second embedding part; 310. Top cover plate; 311. First connecting hole; 312. Second connecting hole; 313. First mounting groove structure; 314. Second mounting groove structure; 315. Mounting hole; 320. First internal insulating plastic part; 321. First connecting through hole; 322. First mounting groove; 323. First sealing ring; 330. Second internal insulating plastic part; 331. Second connecting through hole; 332. Second mounting groove; 340. Explosion-proof valve; 350. Protective plate; 360. First riveting block; 370. Second riveting block; 380. First external insulating plastic part; 381. Riveting block mounting groove; 382. Riveting block limiting step; 383. Pole post through hole; 390. Second external insulating plastic part. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0031] See Figure 1 and Figure 2 The image shows an example of a double-sided self-piercing connecting cover plate provided by this utility model.

[0032] As shown in the figure, the double-sided self-piercing connection cover plate in this example mainly includes the pole post 1, the adapter piece 2, and the cover plate body 3.

[0033] The two ends of the electrode post 1 are respectively formed with self-piercing riveting parts for cooperating with the cover plate body 3 and the adapter piece 2. Based on the self-piercing form, a self-piercing riveting structure is formed with the cover plate body 3 and the adapter piece 2. During assembly, the cover plate body 3 and the adapter piece 2 can be connected simultaneously, improving assembly efficiency. Moreover, there is no need to use mortise and tenon joints, which greatly reduces the space in the height direction of the cover plate and improves the structural compactness of the cover plate and the lithium battery.

[0034] Combination Figure 3 and Figure 4 The electrode post 1 includes an electrode post body 11. The first end 111 of the electrode post body 11 that mates with the adapter piece 2 is provided with a first self-piercing riveting part 12, and the second end 112 that mates with the cover plate body 3 is provided with a second self-piercing riveting part 13. This allows both ends of the electrode post body 11 to mate with the adapter piece 2 and the cover plate body 3 respectively through the first self-piercing riveting part 12 and the second self-piercing riveting part 13 to form a self-piercing riveting structure, thereby improving assembly efficiency and strength.

[0035] Combination Figure 5 In some embodiments, the first self-piercing riveting portion 12 and the second self-piercing riveting portion 13 form a stepped distribution structure with the pole body 11, so that the first self-piercing riveting portion 12 and the second self-piercing riveting portion 13 form a cylindrical distribution.

[0036] Combination Figure 3 and Figure 4 As a preferred configuration, the first self-piercing riveting part 12 and the second self-piercing riveting part 13 are inclined to the outside of the pole body 11 to form an inclined piercing surface and a piercing cavity is formed inside to improve the piercing riveting effect.

[0037] Specifically, one end of the first self-piercing riveting part 12 is distributed on the inner side of the first end 111 of the pole body 11, and the other end extends obliquely to the outside of the pole body 111 to form a first piercing surface 121 oblique to the outside of the pole body 11, and a first piercing cavity 122 is formed inside the first self-piercing riveting part 12.

[0038] Correspondingly, one end of the second self-piercing riveting part 13 is distributed on the inner side of the second end 112 of the pole body 11, and the other end extends obliquely to the outside of the pole body 111 to form a second piercing surface 131 oblique to the outside of the pole body 11, and a second piercing cavity 132 is formed inside the second self-piercing riveting part 13.

[0039] In this way, the inclined first puncture surface 121 and the second puncture surface 132 can respectively increase the local stress concentration when the first self-puncturing riveting part 12 and the second self-puncturing riveting part 13 penetrate the adapter piece 2 and the cover plate body 3, so as to effectively reduce the puncture resistance, allowing the first puncture surface 121 and the second puncture surface 132 to quickly penetrate the adapter piece 2 and the cover plate body 3, and to more easily deform and expand towards the outside of the pole body 11, so that the adapter piece 2 and the cover plate body 3 can be embedded in the first puncture cavity 122 and the second puncture cavity 132 respectively, forming a stable riveting structure with the adapter piece 2 and the cover plate body 3 respectively, ensuring the connection strength and quality between the pole 1 and the adapter piece 2 and the cover plate body 3.

[0040] Meanwhile, the riveting process is only required in the last step of assembly to simultaneously lock the terminal post 1, the adapter piece 2, and the cover plate body 3, greatly reducing assembly time and processes to improve assembly efficiency. Furthermore, the absence of mortise and tenon joints significantly reduces the space in the height direction of the cover plate, improving the structural compactness of the cover plate and the lithium battery.

[0041] Furthermore, the first self-piercing riveting part 12 and the second self-piercing riveting part 13 can be configured symmetrically or asymmetrically at both ends of the pole body 11, depending on the specific application, so that the first self-piercing riveting part 12 and the second self-piercing riveting part 13 can respectively adapt to the riveting areas of the adapter piece 2 and the cover plate body 3.

[0042] Correspondingly, the adapter piece 2 is provided with a first riveting engagement part 21 for engaging with the first self-piercing riveting part 12.

[0043] Combination Figure 6 and Figure 7 Specifically, the first riveting mating part 21 protrudes on the adapter piece 2 and includes a first riveting groove 211 and a first embedding part 212. The first riveting groove 211 is configured to be distributed in an annular groove that matches the first puncture surface 121, thereby forming an arc-shaped first embedding part 212 that matches the first puncture cavity 122 in the middle region of the first riveting groove 211.

[0044] Combination Figure 2 In this way, when the first self-piercing riveting part 12 is riveted with the adapter piece 2, the first piercing surface 121 can be embedded in the first riveting groove 211, generating a piercing force on the groove wall of the first riveting groove 211 to quickly penetrate the first riveting groove 211, and deform and expand towards the outside of the first riveting groove 211, embedding the first embedding part 212 into the first piercing cavity 122, so that the first self-piercing riveting part 12 and the adapter piece 2 form a self-piercing riveting structure, effectively improving the connection efficiency and connection strength.

[0045] Correspondingly, the cover plate body 3 includes a riveting block 31 for cooperating with the pole post 1, and the riveting block 31 is provided with a second riveting engagement part 301 for cooperating with the second self-piercing riveting part 13.

[0046] Combination Figure 8 Specifically, the second riveting mating part 301 is recessed on the riveting block 31, including a second riveting groove 3011 and a second embedding part 3012. The second riveting groove 3011 is configured to have an annular groove distribution that matches the second puncture surface 131, thereby forming an arc-shaped second embedding part 3012 that matches the second puncture cavity 132 in the middle region of the second riveting groove 3011.

[0047] Combination Figure 2 In this way, when the second self-piercing riveting part 13 is riveted with the riveting block 31, the second piercing surface 131 can be embedded in the second riveting groove 3011, generating a piercing force on the groove wall of the second riveting groove 3011 to quickly penetrate the second riveting groove 3011, and deform and expand towards the outside of the second riveting groove 3011 to embed the second embedding part 3012 into the second piercing cavity 132, so that the second self-piercing riveting part 13 and the riveting block 31 form a self-piercing riveting structure, and effectively improve the connection efficiency and connection strength.

[0048] The pole post 1 thus formed engages with the first riveting mating part 21 of the adapter piece 2 through the first self-piercing riveting part 12 to form a self-piercing riveting structure. It also engages with the second riveting mating part 301 of the riveting block 31 through the second self-piercing riveting part 13 to form a self-piercing riveting structure. During assembly, it is not necessary to first perform the mortise and tenon process to connect the riveting block 31 and then the riveting process to connect the adapter piece 2. The riveting process can simultaneously achieve a stable connection between the pole post 1, the adapter piece 2, and the cover plate body 3, thereby improving assembly efficiency.

[0049] Meanwhile, the connection between the pole post 1 and the cover plate body 3 will not increase the height space due to the expansion joint, which can significantly reduce the space in the height direction of the cover plate and improve the structural compactness of the cover plate and lithium battery.

[0050] The following specific application examples will further illustrate the present invention.

[0051] Here, we take a bipolar structure with a negative electrode post 110 and a positive electrode post 120 set on the cover plate body 3 as an example.

[0052] Combination Figure 1 In this example, the two ends of the cover plate body 3 are respectively provided with a negative terminal post 110 and a positive terminal post 120. The negative terminal post 110 is fixedly connected to the negative terminal adapter piece 210 and the cover plate body 3 based on a self-piercing riveting structure. Similarly, the positive terminal post 120 is fixedly connected to the positive terminal adapter piece 220 and the cover plate body 3 based on a self-piercing riveting structure.

[0053] Specifically, the cover body 3 includes a top cover 310, a first internal insulating plastic component 320, a second internal insulating plastic component 330, an explosion-proof valve 340, and a protective plate 350.

[0054] The top cover plate 310 is rectangular in shape, with a first connection hole 311 and a second connection hole 312 formed at both ends for connecting the negative terminal 110 and the positive terminal 120, respectively.

[0055] Based on this, in order to improve the stability of the fixed connection with the negative terminal 110 and the positive terminal 120, this example forms a first mounting groove structure 313 and a second mounting groove structure 314 respectively in the periphery of the first connecting hole 311 and the second connecting hole 312 to match the first connecting hole 311 and the second connecting hole 312.

[0056] The specific structural forms of the first mounting groove structure 313 and the second mounting groove structure 314 are not limited here, and can be determined according to actual needs. As an example, a square mounting groove structure is preferred here.

[0057] Based on this, the top cover plate 310 has a mounting hole 315 in the middle position for mounting the explosion-proof valve 340, which is adapted to the explosion-proof valve 340 and the protective plate 350.

[0058] Furthermore, the explosion-proof valve 340 is installed in the mounting hole 315 on the top cover plate 310 via a welded structure. Here, the structure of the explosion-proof valve 340 and the specific mounting welding structure are not limited and can be determined according to actual needs.

[0059] Based on this, the protective plate 350 is fixedly installed on the mounting hole 315 on the top cover plate 310 via an adhesive structure in the direction of the first surface of the top cover plate 310, so as to cover the explosion-proof valve 340 and provide protection for the explosion-proof valve 340. The structure and specific installation scheme of the protective plate 350 are not limited here, and can be determined according to actual needs.

[0060] The first internal insulating plastic component 320 and the second internal insulating plastic component 330 in the cover plate body 3 are adapted to the second surface of the top cover plate 310. At the same time, the first internal insulating plastic component 320 and the second internal insulating plastic component 330 are respectively provided with a first connecting through hole 321 and a second connecting through hole 331 at the positions corresponding to the first connecting hole 311 and the second connecting hole 312 on the top cover plate 310. Furthermore, the first internal insulating plastic component 320 and the second internal insulating plastic component 330 are respectively provided with a first mounting groove 322 and a second mounting groove 332 at the positions corresponding to the mounting hole 315 on the top cover plate 310. The first mounting groove 322 and the second mounting groove 332 can be adapted to the explosion-proof valve 340 through mutual cooperation.

[0061] The first internal insulating plastic component 320 and the second internal insulating plastic component 330, with such a structure, are fitted together on the second surface of the top cover plate 310. The first connecting through hole 321 on the first internal insulating plastic component 320 corresponds to the first connecting hole 311 on the top cover plate 310, and the second connecting through hole 332 on the second internal insulating plastic component 331 corresponds to the second connecting hole 312 on the top cover plate 310. The first mounting groove 322 on the first internal insulating plastic component 320 and the second mounting groove 332 on the second internal insulating plastic component 330 fit together, which perfectly covers the explosion-proof valve 340 installed in the mounting hole 315 on the top cover plate 310.

[0062] In conjunction with the negative terminal 110 and the positive terminal 120, the cover plate body 3 also includes a first riveting block 360, a second riveting block 370, a first external insulating plastic part 380, and a second external insulating plastic part 390. The first riveting block 360 and the first external insulating plastic part 380 cooperate to connect the negative terminal 110, and the second riveting block 370 and the second external insulating plastic part 390 cooperate to connect the positive terminal 120.

[0063] Here, the solution of this utility model is specifically described using the first riveting block 360 and the first external insulating plastic part 380 as examples.

[0064] The overall structure of the negative electrode post 110, the negative electrode adapter piece 210 and the first riveting block 360 is the same as the structure of the aforementioned post 1, adapter piece 2 and riveting block 31, and will not be described again here.

[0065] The negative electrode post 110 is preferably made of aluminum, copper, or copper-aluminum composite material. A first self-piercing riveting part and a second self-piercing riveting part are respectively provided at the first end and the second end of the negative electrode post body. A first riveting mating part is provided on the negative electrode adapter piece 210. A second riveting mating part is provided on the first riveting block 360.

[0066] Furthermore, a first sealing ring 323 is disposed in the first connecting through hole 321 of the first internal insulating plastic component 320. The first sealing ring 323 is a T-shaped sealing ring, which is adapted to the first connecting through hole 321 on the first internal insulating plastic component 320 and can be disposed in the first connecting through hole 321. At the same time, the internal through hole of the first sealing ring 323 is adapted to the first end of the negative electrode post 110 and can accommodate the negative electrode post 110 passing through it.

[0067] The overall structure of the first external insulating plastic component 380 is adapted to the first mounting groove structure 313 on the top cover plate 310, so that the first external insulating plastic component 380 can be mounted in the first mounting groove structure 313.

[0068] Meanwhile, a rivet block placement groove 381 adapted to the first rivet block 360 is formed on the upper surface of the first external insulating plastic part 380. A rivet block limiting step 382 is formed at the corner of the rivet block placement groove 381, so that the first rivet block 360 is placed in the rivet block placement groove 381 and limited by the rivet block limiting step 382, ​​so as to ensure the stability and reliability of the connection between the first rivet block 360 and the negative terminal post 110.

[0069] Furthermore, the first external insulating plastic part 380 has a pole through hole 383 at the bottom of the riveting block mounting groove 381. The pole through hole 383 is adapted to the negative pole 110 and the second riveting mating part in the first riveting block 360, so that the negative pole 110 can pass through the pole through hole 383 and mate with the second riveting mating part of the first riveting block 360.

[0070] In this way, when the negative terminal post 110 is assembled and fixed with the cover plate body 3, the first sealing ring 322 is placed in the first connecting through hole 321 on the first internal insulating plastic part 320; at the same time, the first external insulating plastic part 380 is placed in the first mounting groove structure 313 on the top cover plate 310.

[0071] Based on this, the second end of the negative electrode post 110 is sequentially passed through the first connecting through hole 321 of the first internal insulating plastic part 320, the first sealing ring 322, the first connecting hole 311 on the top cover plate 310, and the electrode post through hole 383 on the first external insulating plastic part 380, and is engaged with the second riveting mating part of the first riveting block 360.

[0072] At this time, the second self-piercing riveting part at the second end of the negative electrode post 110 is embedded in the second riveting mating part of the first riveting block 360, and the first self-piercing riveting part at the first end of the negative electrode post 110 passes through the first connecting through hole 321 of the first internal insulating plastic part 320, is placed at the bottom end of the first internal insulating plastic part 320, and is embedded in the first riveting mating part of the negative electrode adapter piece 210.

[0073] Furthermore, the first riveting block 360, the first external insulating plastic part 380, the top cover plate 310, the first internal insulating plastic part 320, the first sealing ring 322, and the negative electrode adapter piece 210 are fixedly connected together.

[0074] For the negative electrode post 110 fixedly installed on the top cover plate 310, the first self-piercing riveting part at the first end of the negative electrode post 110 is correspondingly set with the first riveting mating part on the negative electrode adapter piece 210, and the second self-piercing riveting part at the second end of the negative electrode post 110 is correspondingly set with the second riveting mating part of the first riveting block 360.

[0075] Based on this, through riveting operations, the piercing surfaces of the first and second self-piercing riveting parts are simultaneously embedded into the riveting grooves of the first and second riveting mating parts, generating a piercing force on the groove wall to quickly penetrate the groove and deform and expand outwards. This simultaneously embeds the embedded parts of the first and second riveting mating parts into the piercing cavities at both ends of the negative electrode post 110, allowing the negative electrode post 110 to simultaneously form a self-piercing riveting structure with the negative electrode adapter piece 210 and the first riveting block 360, effectively improving connection efficiency and strength. Figure 9 and Figure 10 As shown.

[0076] Correspondingly, the specific composition of the second riveting block 370 and the second external insulating plastic part 390, as well as the specific matching scheme with the positive terminal post 120, are the same as the negative terminal post 110 scheme described above, and will not be repeated here.

[0077] The resulting double-sided self-piercing connecting cover plate, through the synchronous cooperation of the self-piercing riveting part with the adapter piece and the cover plate body, forms a stable self-piercing riveting structure, thereby improving assembly efficiency, reducing the height space of the cover plate, and improving the structural compactness of the cover plate.

[0078] This utility model also provides a lithium battery, which includes a double-sided self-piercing connecting cover plate constructed by the above-described scheme. While ensuring the overall structural stability of the lithium battery, it can effectively improve the overall structural compactness of the lithium battery.

[0079] Furthermore, the double-sided self-piercing connection cover in this lithium battery includes one or two terminals.

[0080] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A double-sided self-piercing connecting cover plate, comprising an electrode post, an adapter piece, and a cover plate body, characterized in that, The pole has self-piercing riveting parts at both ends for engaging with the cover plate body and the adapter piece, and forms a self-piercing riveting structure with the cover plate body and the adapter piece based on the self-piercing form.

2. The double-sided self-piercing connecting cover plate according to claim 1, characterized in that, The pole includes a pole body, a first end of which is provided with a first self-piercing riveting part, and a second end of which is provided with a second self-piercing riveting part.

3. The double-sided self-piercing connecting cover plate according to claim 2, characterized in that, The first self-piercing riveting part and the second self-piercing riveting part respectively form a stepped distribution structure with the pole body.

4. The double-sided self-piercing connecting cover plate according to claim 2, characterized in that, The first and second self-piercing riveting parts are inclined to the outside of the pole body to form an inclined piercing surface and a piercing cavity is formed inside.

5. The double-sided self-piercing connecting cover plate according to claim 2, characterized in that, The first self-piercing riveting part and the second self-piercing riveting part are respectively symmetrically or asymmetrically arranged at both ends of the pole body.

6. The double-sided self-piercing connecting cover plate according to claim 4, characterized in that, The adapter piece is provided with a first riveting mating part, which includes a first riveting groove that is adapted to the first piercing surface of the first self-piercing riveting part, and a first embedding part that is adapted to the first piercing cavity of the first self-piercing riveting part.

7. The double-sided self-piercing connecting cover plate according to claim 4, characterized in that, The cover plate body includes a riveting block, and the riveting block is provided with a second riveting mating part adapted to the second self-piercing riveting part.

8. The double-sided self-piercing connecting cover plate according to claim 7, characterized in that, The second riveting mating part includes a second riveting groove adapted to the second piercing surface of the second self-piercing riveting part, and a second embedding part adapted to the second piercing cavity of the second self-piercing riveting part.

9. A lithium battery, characterized in that, Includes the double-sided self-piercing connecting cover plate according to any one of claims 1 to 8.

10. The lithium battery according to claim 9, characterized in that, The double-sided self-piercing connection cover plate includes one or two pole posts.

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