Top cover structure and square battery

Abstract

The utility model provides a top cover structure and a square battery, and the top cover structure comprises lower plastic, a top cover sheet, a positive electrode assembly and a negative electrode assembly, the lower plastic is connected with the bottom surface of the top cover sheet; a first placing hole and a second placing hole are formed in the top surface of the top cover sheet; the positive electrode assembly comprises a positive electrode column and a first insulation pad, the positive electrode column is coaxially and partially inserted into the first placement hole, an insulation gap is formed between the positive electrode column and the inner wall of the first placement hole, and the first insulation pad is located between the positive electrode column and the top cover plate; the cathode assembly comprises a cathode column and a second insulation pad, the cathode column is coaxially and partially inserted into the second placing hole, an insulation gap is formed between the cathode column and the inner wall of the second placing hole, and the second insulation pad is located between the cathode column and the top cover plate. And the positive electrode assembly and the negative electrode assembly are in threaded connection or welding with the top cover plate, so that the working hours required by connection can be reduced, the production efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover structure and a square battery. Background Art

[0002] At present, the common connection methods between the top cover and the pole post are injection molding and riveting structures. The technological processes of injection molding and riveting structures generally include putting lower plastic, top cover sheet, pole post, sealing ring, upper plastic, etc. into the mold in sequence, and injecting the pole post in the mold or using the mold to rivet and press the pole post to achieve the connection and fixation between the pole post and the top cover sheet.

[0003] However, the above structures have many components, and each component needs to be put into the mold in sequence, resulting in low production efficiency and high cost. Summary of the Utility Model

[0004] In view of this, the utility model provides a top cover structure and a square battery to solve the technical problems of many components, each component needs to be put into the mold in sequence, low production efficiency and high cost mentioned in the above background art.

[0005] The technical solution of the utility model is realized as follows:

[0006] In the first aspect, the utility model provides a top cover structure, which includes a lower plastic, a top cover sheet, a positive electrode assembly and a negative electrode assembly, wherein:

[0007] The lower plastic is connected to the bottom surface of the top cover sheet;

[0008] A first placement hole and a second placement hole are arranged on the top surface of the top cover sheet;

[0009] The positive electrode assembly is threadedly connected or welded to the top cover sheet. The positive electrode assembly includes a positive electrode post and a first insulating pad. The positive electrode post is coaxially and partially inserted into the first placement hole and has an insulating gap with the inner wall of the first placement hole. The first insulating pad is located between the positive electrode post and the top cover sheet;

[0010] The negative electrode assembly is threadedly connected or welded to the top cover sheet. The negative electrode assembly includes a negative electrode post and a second insulating pad. The negative electrode post is coaxially and partially inserted into the second placement hole and has an insulating gap with the inner wall of the second placement hole. The second insulating pad is located between the negative electrode post and the top cover sheet.

[0011] On the basis of the above technical solutions, preferably, a first placement groove and a second placement groove are arranged on the top surface of the top cover sheet. The first placement hole is located in the first placement groove, and the first insulating pad is placed in the first placement groove; the second placement hole is located in the second placement groove, and the second insulating pad is placed in the second placement groove.

[0012] Based on the above technical solutions, preferably, a first mounting hole is provided at the bottom of the first placement groove, and a second mounting hole is provided at the bottom of the second placement groove;

[0013] The top cover structure further includes a first fastening nail and a second fastening nail made of insulating material. The first fastening nail and the second fastening nail are respectively partially placed in the first mounting hole and the second mounting hole. The first fastening nail is used to connect the first insulating pad and the positive electrode column, and the second fastening nail is used to connect the second insulating pad and the negative electrode column.

[0014] Based on the above technical solutions, preferably, at least two first mounting holes are provided, and at least two second mounting holes are provided.

[0015] Based on the above technical solutions, preferably, the first mounting hole and the second mounting hole are through holes. A first connection hole matching the first mounting hole is provided on the first insulating pad, and the first fastening nail passes through the first mounting hole and the first connection hole to connect with the positive electrode column; a second connection hole matching the second mounting hole is provided on the second insulating pad, and the second fastening nail passes through the second mounting hole and the second connection hole to connect with the negative electrode column.

[0016] Based on the above technical solutions, preferably, the first mounting hole and the second mounting hole are blind holes;

[0017] The positive electrode assembly further includes a first welding piece, which is located below the first insulating pad and is used for welding with the top cover piece. The cap end of the first fastening nail is located in the first mounting hole, and the first fastening nail is used to connect the first welding piece, the first insulating pad and the positive electrode column;

[0018] The negative electrode assembly further includes a second welding piece, which is located below the second insulating pad and is used for welding with the top cover piece. The cap end of the second fastening nail is located in the second mounting hole, and the second fastening nail is used to connect the second welding piece, the second insulating pad and the negative electrode column.

[0019] Based on the above technical solutions, preferably, a first screw hole is provided on the positive electrode column, and the first fastening nail is connected to the first screw hole; a second screw hole is provided on the negative electrode column, and the second fastening nail is connected to the second screw hole.

[0020] Based on the above technical solutions, preferably, the positive electrode column includes a positive electrode column body and a first connection column. The first connection column is located below the positive electrode column body, and the first connection column is used to be inserted into the first placement hole. The first screw hole is provided on the positive electrode column body;

[0021] The negative electrode post includes a negative electrode post body and a second connection post. The second connection post is located below the negative electrode post body. The second connection post is used to be inserted into the second placement hole, and the second screw hole is provided on the negative electrode post body.

[0022] Based on the above technical solutions, preferably, a first avoidance hole and a second avoidance hole are respectively provided on the lower plastic corresponding to the first placement hole and the second placement hole. The first avoidance hole allows the first connection post to penetrate, and the second avoidance hole allows the second connection post to penetrate.

[0023] In a second aspect, the present utility model provides a square battery, including a bottom case, an electric core, and the top cover structure described in the first aspect. The electric core is placed in the bottom case, and the top cover sheet is connected to the bottom case.

[0024] The top cover structure of the present utility model has the following beneficial effects compared with the prior art:

[0025] (1) By coaxially and partially inserting the positive electrode post into the first placement hole and having an insulating gap with the inner wall of the first placement hole, the first insulating pad is located between the positive electrode post and the top cover sheet; the negative electrode post is coaxially and partially inserted into the second placement hole and has an insulating gap with the inner wall of the second placement hole, and the second insulating pad is located between the negative electrode post and the top cover sheet. Through the above structure, insulation between the top surface of the top cover sheet and the positive electrode post and the negative electrode post is achieved, so that it is not necessary to use an upper plastic, reducing the number of components. And by screwing or welding the positive electrode assembly and the negative electrode assembly to the top cover sheet, instead of injection molding or riveting to connect the electrode post and the top cover sheet, the working hours required for connection can be reduced, the assembly efficiency can be improved, the production efficiency can be increased, and the cost can be reduced;

[0026] (2) By providing a first placement groove and a second placement groove on the top surface of the top cover sheet, the first placement hole is located in the first placement groove, and the first insulating pad is placed in the first placement groove; the second placement hole is located in the second placement groove, and the second insulating pad is placed in the second placement groove; the first placement groove and the second placement groove can position and limit the first insulating pad and the second insulating pad, improve the concentricity of the first insulating pad and the first placement hole, and the concentricity of the second insulating pad and the second placement hole, ensure the insulation effect, and improve the reliability;

[0027] (3) By providing at least two first mounting holes and at least two second mounting holes, after the first fastening screw is placed in the first mounting hole and the second fastening screw is placed in the second mounting hole, the positive electrode post and the negative electrode post can be prevented from twisting, avoiding poor contact between the electrical components and the positive electrode post and the negative electrode post due to twisting, and improving the reliability and safety of the device;

[0028] (4) By setting the first mounting hole and the second mounting hole as through holes, the first fastening nail passes through the first mounting hole and the first connection hole to be connected to the positive electrode column, connecting the positive electrode column to the top cover sheet and fixing the first insulating pad between the positive electrode column and the top cover sheet; the second fastening nail passes through the second mounting hole and the second connection hole to be connected to the negative electrode column, connecting the negative electrode column to the top cover sheet and fixing the second insulating pad between the negative electrode column and the top cover sheet; through the first fastening nail and the second fastening nail, threaded connection between the positive electrode assembly and the negative electrode assembly and the top cover sheet can be achieved, improving the assembly efficiency and production efficiency;

[0029] (5) The first mounting hole and the second mounting hole are blind holes; the first fastening nail connects the first welding sheet, the first insulating pad and the positive electrode column. First, the positive electrode assembly is assembled, and then the cap end of the first fastening nail is placed in the first mounting hole, and the first welding sheet is welded to the top cover sheet; the second fastening nail connects the second welding sheet, the second insulating pad and the negative electrode column. First, the negative electrode assembly is assembled, and then the cap end of the second fastening nail is placed in the second mounting hole, and the second welding sheet is welded to the top cover sheet. This assembly method can assemble the positive electrode assembly and the negative electrode assembly in advance, position the first fastening nail and the second fastening nail through the first mounting hole and the second mounting hole respectively, and then complete the connection by welding. The assembly efficiency is relatively high, and the production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 is a perspective view of the top cover structure of the present invention;

[0032] Figure 2 is an exploded view of a top cover structure of the present invention;

[0033] Figure 3 is the Figure 2 perspective view of the top cover sheet in the present invention;

[0034] Figure 4 is an exploded view of another top cover structure of the present invention;

[0035] Figure 5 is the Figure 4 perspective view of the top cover sheet in the present invention;

[0036] Figure 6 is a perspective view of the positive electrode post of the present utility model;

[0037] Figure 7 is a perspective view of the negative electrode post of the present utility model.

[0038] Explanation of reference numerals: 1 - lower plastic, 2 - top cover sheet, 3 - positive electrode assembly, 4 - negative electrode assembly, 5 - first fastening nail, 6 - second fastening nail;

[0039] 11 - first avoidance hole, 12 - second avoidance hole;

[0040] 21 - first placement hole, 22 - second placement hole, 23 - first placement groove, 24 - second placement groove, 25 - first mounting hole, 26 - second mounting hole;

[0041] 31 - positive electrode post, 311 - positive electrode post body, 3111 - first screw hole, 312 - first connection post, 32 - first insulating pad, 321 - first connection hole, 33 - first welding piece, 331 - third connection hole;

[0042] 41 - negative electrode post, 411 - negative electrode post body, 4111 - second screw hole, 412 - second connection post, 42 - second insulating pad, 421 - second connection hole, 43 - second welding piece, 431 - fourth connection hole. Specific embodiments

[0043] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0044] Refer to Figures 1-7 As shown, in the first - aspect embodiment of the present utility model, a top - cover structure is proposed, including a lower plastic 1, a top - cover sheet 2, a positive - electrode assembly 3, and a negative - electrode assembly 4, wherein:

[0045] The lower plastic 1 is connected to the bottom surface of the top - cover sheet 2; the connection here can be made by means of heat - melting posts.

[0046] On the top surface of the top - cover sheet 2, a first placement hole 21 and a second placement hole 22 are provided;

[0047] The positive electrode assembly 3 is threadedly connected or welded to the top cover sheet 2. The positive electrode assembly 3 includes a positive electrode post 31 and a first insulating pad 32. The positive electrode post 31 is coaxially and partially inserted into the first placement hole 21 and has an insulating gap with the inner wall of the first placement hole 21. The first insulating pad 32 is located between the positive electrode post 31 and the top cover sheet 2;

[0048] The negative electrode assembly 4 is threadedly connected or welded to the top cover sheet 2. The negative electrode assembly 4 includes a negative electrode post 41 and a second insulating pad 42. The negative electrode post 41 is coaxially and partially inserted into the second placement hole 22 and has an insulating gap with the inner wall of the second placement hole 22. The second insulating pad 42 is located between the negative electrode post 41 and the top cover sheet 2.

[0049] In the top cover structure proposed in this embodiment, since the positive electrode post 31 has an insulating gap with the inner wall of the first placement hole 21, and the first insulating pad 32 is located between the positive electrode post 31 and the top cover sheet 2; the negative electrode post 41 has an insulating gap with the inner wall of the second placement hole 22, and the second insulating pad 42 is located between the negative electrode post 41 and the top cover sheet 2. Through the above structure, insulation between the top surface of the top cover sheet 2 and the positive electrode post 31 and the negative electrode post 41 is achieved. Thus, it is not necessary to use upper plastic, reducing the number of components. Moreover, since the positive electrode assembly 3 and the negative electrode assembly 4 are threadedly connected or welded to the top cover sheet 2, replacing injection molding or riveting to connect the electrode post and the top cover sheet 2, the working hours required for connection can be reduced, the assembly efficiency can be improved, the production efficiency can be increased, and the cost can be reduced.

[0050] In some embodiments, a first placement groove 23 and a second placement groove 24 are provided on the top surface of the top cover sheet 2. The first placement groove 23 and the second placement groove 24 are symmetrically arranged on both sides of the center of the top cover sheet 2. The first placement hole 21 is located in the first placement groove 23, and the first insulating pad 32 is placed in the first placement groove 23; the second placement hole 22 is located in the second placement groove 24, and the second insulating pad 42 is placed in the second placement groove 24. The first insulating pad 32 and the second insulating pad 42 can be positioned and limited by the first placement groove 23 and the second placement groove 24, improving the concentricity between the first insulating pad 32 and the first placement hole 21, improving the concentricity between the second insulating pad 42 and the second placement hole 22, ensuring the insulation effect, and improving the reliability.

[0051] In some embodiments, a first mounting hole 25 is provided at the bottom of the first placement groove 23, and a second mounting hole 26 is provided at the bottom of the second placement groove 24; the top cover structure further includes a first fastening nail 5 and a second fastening nail 6 made of insulating material. The first fastening nail 5 and the second fastening nail 6 are respectively partially placed in the first mounting hole 25 and the second mounting hole 26. The first fastening nail 5 is used to connect the first insulating pad 32 and the positive electrode column 31, and the second fastening nail 6 is used to connect the second insulating pad 42 and the negative electrode column 41. By using the first fastening nail 5 to connect the first insulating pad 32 and the positive electrode column 31, and the second fastening nail 6 to connect the second insulating pad 42 and the negative electrode column 41, and the first fastening nail 5 and the second fastening nail 6 are respectively partially placed in the first mounting hole 25 and the second mounting hole 26, the connection and fixation or positioning of the positive electrode column 31 can be achieved, the convenience of device assembly can be improved, and thus the production efficiency can be increased.

[0052] In some embodiments, at least two first mounting holes 25 are provided, and at least two second mounting holes 26 are provided. The at least two first mounting holes 25 are evenly distributed around the outer circumference of the first placement hole 21, and the at least two second mounting holes 26 are evenly distributed around the outer circumference of the second placement hole 22. By providing at least two first mounting holes 25 and at least two second mounting holes 26, after the first fastening nail 5 is placed in the first mounting hole 25 and the second fastening nail 6 is placed in the second mounting hole 26, the positive electrode column 31 and the negative electrode column 41 can be prevented from twisting, and the poor contact between the electrical components and the positive electrode column 31 and the negative electrode column 41 caused by the twisting of the positive electrode column 31 and the negative electrode column 41 can be avoided, and the reliability and safety of the device can be improved.

[0053] In some embodiments, such as Figure 2 and Figure 3As shown, the first mounting hole 25 and the second mounting hole 26 are through holes. A first connection hole 321 matching the first mounting hole 25 is provided on the first insulating pad 32. The first fastening nail 5 passes through the first mounting hole 25 and the first connection hole 321 to be connected to the positive electrode post 31. A second connection hole 421 matching the second mounting hole 26 is provided on the second insulating pad 42. The second fastening nail 6 passes through the second mounting hole 26 and the second connection hole 421 to be connected to the negative electrode post 41. By sequentially passing the first fastening nail 5 through the first mounting hole 25 and the first connection hole 321 to be connected to the positive electrode post 31, the positive electrode post 31 is connected to the top cover sheet 2 and the first insulating pad 32 is fixed between the positive electrode post 31 and the top cover sheet 2. The second fastening nail 6 sequentially passes through the second mounting hole 26 and the second connection hole 421 to be connected to the negative electrode post 41, connecting the negative electrode post 41 to the top cover sheet 2 and fixing the second insulating pad 42 between the negative electrode post 41 and the top cover sheet 2. Through the first fastening nail 5 and the second fastening nail 6, threaded connection between the positive electrode assembly 3 and the negative electrode assembly 4 and the top cover sheet 2 can be achieved, improving the assembly efficiency and production efficiency.

[0054] In some embodiments, as Figure 4 and Figure 5 shown, the first mounting hole 25 and the second mounting hole 26 are blind holes. The positive electrode assembly 3 further includes a first welding sheet 33. The first welding sheet 33 is located below the first insulating pad 32 and is used for welding with the top cover sheet 2. The cap end of the first fastening nail 5 is located in the first mounting hole 25. The first fastening nail 5 is used to connect the first welding sheet 33, the first insulating pad 32, and the positive electrode post 31. The negative electrode assembly 4 further includes a second welding sheet 43. The second welding sheet 43 is located below the second insulating pad 42 and is used for welding with the top cover sheet 2. The cap end of the second fastening nail 6 is located in the second mounting hole 26. The second fastening nail 6 is used to connect the second welding sheet 43, the second insulating pad 42, and the negative electrode post 41. A third connection hole 331 is provided on the first welding sheet 33, and a fourth connection hole 431 is provided on the second welding sheet 43. The first fastening nail 5 sequentially passes through the third connection hole 331 and the first connection hole 321 to be connected to the positive electrode post 31, and the second fastening nail 6 sequentially passes through the fourth connection hole 431 and the second connection hole 421 to be connected to the negative electrode post 41.

[0055] In this embodiment, the first fastening nail 5 is used to connect the first welding piece 33, the first insulating pad 32 and the positive electrode post 31. First, the positive electrode assembly 3 is assembled. Then, the cap end of the first fastening nail 5 is placed in the first mounting hole 25, and the first welding piece 33 is welded to the top cover piece 2. The second fastening nail 6 is used to connect the second welding piece 43, the second insulating pad 42 and the negative electrode post 41. First, the negative electrode assembly 4 is assembled. Then, the cap end of the second fastening nail 6 is placed in the second mounting hole 26, and the second welding piece 43 is welded to the top cover piece 2. This assembly method can assemble the positive electrode assembly 3 and the negative electrode assembly 4 in advance, position the first fastening nail 5 and the second fastening nail 6 through the first mounting hole 25 and the second mounting hole 26 respectively, and then complete the connection by welding. The assembly efficiency is relatively high, and the production efficiency can be improved.

[0056] In some embodiments, a first screw hole 3111 is provided on the positive electrode post 31, and the first fastening nail 5 is connected to the first screw hole 3111; a second screw hole 4111 is provided on the negative electrode post 41, and the second fastening nail 6 is connected to the second screw hole 4111. By connecting the first fastening nail 5 to the first screw hole 3111, the connection between the first fastening nail 5 and the positive electrode post 31 is realized. By connecting the second fastening nail 6 to the second screw hole 4111, the connection between the second fastening nail 6 and the negative electrode post 41 is realized. The installation and disassembly are relatively convenient, and the assembly efficiency can be improved.

[0057] In some embodiments, the positive electrode post 31 includes a positive electrode post body 311 and a first connecting post 312. The first connecting post 312 is located below the positive electrode post body 311. The first connecting post 312 is used to be inserted into the first placement hole 21, and the first screw hole 3111 is provided on the positive electrode post body 311; the negative electrode post 41 includes a negative electrode post body 411 and a second connecting post 412. The second connecting post 412 is located below the negative electrode post body 411. The second connecting post 412 is used to be inserted into the second placement hole 22, and the second screw hole 4111 is provided on the negative electrode post body 411. By the first connecting post 312 being used to be inserted into the first placement hole 21, the first screw hole 3111 being provided on the positive electrode post body 311, the first insulating pad 32 being located between the positive electrode post body 311 and the first placement groove 23, the second connecting post 412 being used to be inserted into the second placement hole 22, the second screw hole 4111 being provided on the negative electrode post body 411, and the second insulating pad 42 being located between the negative electrode post body 411 and the second placement groove 24.

[0058] In some embodiments, first avoidance holes 11 and second avoidance holes 12 are respectively provided on the lower plastic 1 corresponding to the first placement hole 21 and the second placement hole 22. The first avoidance hole 11 allows the first connecting post 312 to penetrate, and the second avoidance hole 12 allows the second connecting post 412 to penetrate. By providing the first avoidance hole 11 and the second avoidance hole 12 on the lower plastic 1, with the first avoidance hole 11 allowing the first connecting post 312 to penetrate and the second avoidance hole 12 allowing the second connecting post 412 to penetrate, it is convenient for the first connecting post 312 and the second connecting post 412 to connect the battery cells, improving the reliability of the device.

[0059] The working principle of this top cover structure is as follows: The first mounting hole 25 and the second mounting hole 26 can be set as through holes. The first fastening nail 5 sequentially passes through the first mounting hole 25 and the first connection hole 321 to be connected to the positive electrode post 31, connecting the positive electrode post 31 to the top cover sheet 2 and fixing the first insulating pad 32 between the positive electrode post 31 and the top cover sheet 2; the second fastening nail 6 sequentially passes through the second mounting hole 26 and the second connection hole 421 to be connected to the negative electrode post 41, connecting the negative electrode post 41 to the top cover sheet 2 and fixing the second insulating pad 42 between the negative electrode post 41 and the top cover sheet 2; through the first fastening nail 5 and the second fastening nail 6, threaded connection between the positive electrode assembly 3 and the negative electrode assembly 4 and the top cover sheet 2 can be achieved, improving the assembly efficiency and production efficiency.

[0060] The first mounting hole 25 and the second mounting hole 26 can be set as blind holes. The first fastening nail 5 connects the first welding piece 33, the first insulating pad 32, and the positive electrode post 31. First, the positive electrode assembly 3 is assembled, and then the cap end of the first fastening nail 5 is placed in the first mounting hole 25, and the first welding piece 33 is welded to the top cover sheet 2; the second fastening nail 6 connects the second welding piece 43, the second insulating pad 42, and the negative electrode post 41. First, the negative electrode assembly 4 is assembled, and then the cap end of the second fastening nail 6 is placed in the second mounting hole 26, and the second welding piece 43 is welded to the top cover sheet 2. This assembly method can assemble the positive electrode assembly 3 and the negative electrode assembly 4 in advance, position the first fastening nail 5 and the second fastening nail 6 respectively through the first mounting hole 25 and the second mounting hole 26, and then complete the connection by welding. The assembly efficiency is relatively high, which can improve the production efficiency.

[0061] In the second aspect embodiment of the present utility model, a square battery is provided, including a bottom case, a battery cell, and the top cover structure described in the first aspect embodiment. The battery cell is placed in the bottom case, and the top cover sheet 2 is connected to the bottom case.

[0062] The square battery proposed in this embodiment has a top cover structure that realizes insulation between the top surface of the top cover sheet 2 and the positive electrode post 31 and the negative electrode post 41. Therefore, it is not necessary to use upper plastic, reducing the number of components. Moreover, by threadedly connecting or welding the positive electrode assembly 3 and the negative electrode assembly 4 to the top cover sheet 2, instead of injection molding or riveting to connect the electrode post and the top cover sheet 2, the working hours required for connection can be reduced, the assembly efficiency can be improved, the production efficiency can be increased, and the cost can be reduced.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A top cover structure, characterized in that, It includes a lower plastic (1), a top cover sheet (2), a positive electrode assembly (3) and a negative electrode assembly (4), wherein: The lower plastic (1) is connected to the bottom surface of the top cover sheet (2); On the top surface of the top cover sheet (2), a first placement hole (21) and a second placement hole (22) are provided; The positive electrode assembly (3) is threadedly connected or welded to the top cover sheet (2). The positive electrode assembly (3) includes a positive electrode post (31) and a first insulating pad (32). The positive electrode post (31) is coaxially and partially inserted into the first placement hole (21) and has an insulating gap with the inner wall of the first placement hole (21). The first insulating pad (32) is located between the positive electrode post (31) and the top cover sheet (2); The negative electrode assembly (4) is threadedly connected or welded to the top cover sheet (2). The negative electrode assembly (4) includes a negative electrode post (41) and a second insulating pad (42). The negative electrode post (41) is coaxially and partially inserted into the second placement hole (22) and has an insulating gap with the inner wall of the second placement hole (22). The second insulating pad (42) is located between the negative electrode post (41) and the top cover sheet (2).

2. The top cover structure according to claim 1, characterized in that, On the top surface of the top cover sheet (2), a first placement groove (23) and a second placement groove (24) are provided. The first placement hole (21) is located in the first placement groove (23), and the first insulating pad (32) is placed in the first placement groove (23); the second placement hole (22) is located in the second placement groove (24), and the second insulating pad (42) is placed in the second placement groove (24).

3. The top cover structure according to claim 2, wherein At the bottom of the first placement groove (23), a first mounting hole (25) is provided. At the bottom of the second placement groove (24), a second mounting hole (26) is provided; The top cover structure further includes a first fastening nail (5) and a second fastening nail (6) made of insulating material. The first fastening nail (5) and the second fastening nail (6) are respectively partially placed in the first mounting hole (25) and the second mounting hole (26). The first fastening nail (5) is used to connect the first insulating pad (32) and the positive electrode post (31), and the second fastening nail (6) is used to connect the second insulating pad (42) and the negative electrode post (41).

4. The top cover structure according to claim 3, wherein, There are at least two first mounting holes (25) and at least two second mounting holes (26) provided.

5. The top cover structure according to claim 3, characterized in that, The first mounting hole (25) and the second mounting hole (26) are through holes. On the first insulating pad (32), a first connection hole (321) matching the first mounting hole (25) is provided. The first fastening nail (5) passes through the first mounting hole (25) and the first connection hole (321) to connect with the positive electrode post (31); on the second insulating pad (42), a second connection hole (421) matching the second mounting hole (26) is provided. The second fastening nail (6) passes through the second mounting hole (26) and the second connection hole (421) to connect with the negative electrode post (41).

6. The top cover structure according to claim 3, characterized in that, The first mounting hole (25) and the second mounting hole (26) are blind holes; The positive electrode assembly (3) further includes a first welding piece (33), the first welding piece (33) is located below the first insulating pad (32) and is used for welding with the top cover piece (2), the cap end of the first fastening screw (5) is located in the first mounting hole (25), and the first fastening screw (5) is used for connecting the first welding piece (33), the first insulating pad (32) and the positive electrode post (31); The negative electrode assembly (4) further includes a second welding piece (43), the second welding piece (43) is located below the second insulating pad (42) and is used for welding with the top cover piece (2), the cap end of the second fastening screw (6) is located in the second mounting hole (26), and the second fastening screw (6) is used for connecting the second welding piece (43), the second insulating pad (42) and the negative electrode post (41).

7. The top cover structure according to claim 5 or 6, characterized in that A first screw hole (3111) is provided on the positive electrode post (31), and the first fastening screw (5) is connected to the first screw hole (3111); a second screw hole (4111) is provided on the negative electrode post (41), and the second fastening screw (6) is connected to the second screw hole (4111).

8. The top cover structure according to claim 7, characterized in that, The positive electrode post (31) includes a positive electrode post body (311) and a first connecting post (312), the first connecting post (312) is located below the positive electrode post body (311), the first connecting post (312) is used for inserting into the first placement hole (21), and the first screw hole (3111) is provided on the positive electrode post body (311); The negative electrode post (41) includes a negative electrode post body (411) and a second connecting post (412), the second connecting post (412) is located below the negative electrode post body (411), the second connecting post (412) is used for inserting into the second placement hole (22), and the second screw hole (4111) is provided on the negative electrode post body (411).

9. The top cover structure according to claim 8, characterized in that, The lower plastic (1) is respectively provided with a first avoidance hole (11) and a second avoidance hole (12) corresponding to the first placement hole (21) and the second placement hole (22), the first avoidance hole (11) allows the first connecting post (312) to penetrate, and the second avoidance hole (12) allows the second connecting post (412) to penetrate.

10. A square battery, characterized in that, It includes a bottom shell and an electric core, and a top cover structure as described in any one of claims 1-9, the electric core is placed in the bottom shell, and the top cover piece (2) is connected to the bottom shell.

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