A new top cover assembly for a secondary battery

Abstract

The present invention discloses a novel top cover assembly for a secondary battery, comprising a bare aluminum sheet, plastic on a positive electrode, plastic on a negative electrode, a first positive electrode pressing block, a first negative electrode pressing block, an insulating lower bracket, a second positive electrode pressing block, a second negative electrode pressing block, a positive electrode protective sheet, a negative electrode protective sheet, a positive electrode rivet, and a negative electrode rivet. The positive electrode rivet rivets the first positive electrode pressing block, the plastic on the positive electrode, the bare aluminum sheet, the insulating lower bracket, the second positive electrode pressing block, and the positive electrode protective sheet into one piece, and the negative electrode rivet rivets the first negative electrode pressing block, the plastic on the negative electrode, the bare aluminum sheet, the insulating lower bracket, the second negative electrode pressing block, and the negative electrode protective sheet into one piece. The novel top cover assembly for a secondary battery disclosed in the present invention is convenient and quick to install and assemble, and the overall processing technology is simplified, which is conducive to improving production efficiency and reducing production costs. At the same time, after assembly, the overall sealing effect is good, which is conducive to improving the sealing performance of the battery.

Description

Technical Field

[0001] The present invention relates to the field of secondary batteries, and in particular to a novel top cover assembly of a secondary battery. Background Art

[0002] At present, power batteries generally adopt a square hard shell structure. The power battery shell includes a shell and a top cover assembly. The power battery shell provides a closed space to accommodate the electrode assembly and electrolyte. The electric energy of the electrode assembly is led out from the closed space to the outside of the closed space through the pole of the top cover assembly.

[0003] In the existing top cover assembly, the surface of the pole is used to conduct current. The pole adopts an injection-molded structure, and the connection between the pole and the bare aluminum sheet is poorly sealed, which cannot guarantee the sealing performance of the entire battery. In addition, the pole processing technology is relatively complicated, and the sealing effect of the pole rubber coating leads to high processing costs and low production efficiency. Summary of the Invention

[0004] In view of the above-mentioned shortcomings, the purpose of the present invention is to provide a new top cover assembly for a secondary battery, which is easy and quick to install and assemble, simplifies the overall processing technology, helps to improve production efficiency and reduce production costs. At the same time, after assembly, the overall sealing effect is good, which helps to improve the sealing performance of the battery.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned object is:

[0006] A novel top cover assembly for a secondary battery, characterized by comprising:

[0007] a plain aluminum sheet, on which at least one first rivet hole is formed;

[0008] A positive electrode upper plastic and a negative electrode upper plastic are both disposed on the upper surface of the plain aluminum sheet, and at least one second rivet via hole corresponding to the first rivet via hole is formed on each of the positive electrode upper plastic and the negative electrode upper plastic;

[0009] A positive first pressing block and a negative first pressing block, wherein the positive first pressing block is disposed on the positive electrode upper plastic, and the negative first pressing block is disposed on the negative electrode upper plastic, and at least one rivet mounting hole corresponding to the second rivet through hole is formed on each of the positive first pressing block and the negative first pressing block;

[0010] an insulating lower bracket, which is arranged below the plain aluminum sheet and has at least one third rivet through hole corresponding to the first rivet through hole formed on the insulating lower bracket;

[0011] A positive second pressing block and a negative second pressing block are both arranged on the lower surface of the insulating lower bracket, and at least one fourth rivet through hole corresponding to the third rivet through hole is formed on each of the positive second pressing block and the negative second pressing block;

[0012] a positive electrode protection sheet and a negative electrode protection sheet, wherein the positive electrode protection sheet is disposed on the lower surface of the second positive electrode pressing block, and the negative electrode protection sheet is disposed on the lower surface of the second negative electrode pressing block, and at least one fifth rivet through hole corresponding to the fourth rivet through hole is formed on each of the positive electrode protection sheet and the negative electrode protection sheet;

[0013] At least one positive electrode rivet and at least one negative electrode rivet, the positive electrode rivet sequentially passes through the fifth rivet through hole, the fourth rivet through hole, the third rivet through hole, the first rivet through hole, the second rivet through hole and the rivet mounting hole from bottom to top, and the two ends of the positive electrode rivet are expanded due to extrusion by die stamping, and the first positive electrode pressing block, the positive electrode upper plastic, the bare aluminum sheet, the insulating lower bracket, the second positive electrode pressing block and the positive electrode protection sheet are riveted together; the negative electrode rivet sequentially passes through the fifth rivet through hole, the fourth rivet through hole, the third rivet through hole, the first rivet through hole, the second rivet through hole and the rivet mounting hole from bottom to top, and the two ends of the negative electrode rivet are expanded due to extrusion by die stamping, and the first negative electrode pressing block, the negative electrode upper plastic, the bare aluminum sheet, the insulating lower bracket, the second negative electrode pressing block and the negative electrode protection sheet are riveted together.

[0014] As a further improvement of the present invention, a first boss is protruded on the upper surface of the bare aluminum sheet corresponding to the positive electrode upper plastic and the negative electrode upper plastic, and the first rivet through-hole is formed on the first boss; a lower card groove for the first boss to be embedded is formed on the lower surface of the positive electrode upper plastic and the lower surface of the negative electrode upper plastic, and at the same time, at least one positioning convex ring is protruded downward in the lower card groove and located on the periphery of the second rivet through-hole, and the positioning convex ring is inserted into the first rivet through-hole.

[0015] As a further improvement of the present invention, a second boss is provided on the upper surface of the insulating lower bracket corresponding to the positive electrode upper plastic and the negative electrode upper plastic respectively, and the third rivet through hole is formed on the second boss; and a first lower mounting groove for the second boss to be embedded is formed on the lower surface of the smooth aluminum sheet.

[0016] As a further improvement of the present invention, a third boss is respectively provided on the upper surface of the positive second pressure block and the upper surface of the negative second pressure block, and the fourth rivet through-hole is formed on the third boss; two second lower mounting grooves for embedding the positive second pressure block and the negative second pressure block are respectively formed on the lower surface of the insulating lower bracket, and a third lower mounting groove for embedding the third boss is formed in the second lower mounting groove.

[0017] As a further improvement of the present invention, a fourth boss corresponding to the fifth rivet through-hole is formed on the upper surface of the positive electrode protection sheet and the upper surface of the negative electrode protection sheet, and the fifth rivet through-hole is formed on the fourth boss; and at least one fourth lower mounting groove is formed on the lower surface of the positive electrode second pressure block and the lower surface of the negative electrode second pressure block, which is located outside the fourth rivet through-hole and for the fourth boss to be embedded.

[0018] As a further improvement of the present invention, an upper mounting groove is formed on the upper plastic surface of the positive electrode and the upper plastic surface of the negative electrode respectively, the second rivet through-hole passes through the upper mounting groove, the positive electrode first pressing block is embedded in the upper mounting groove of the positive electrode plastic, and the negative electrode first pressing block is embedded in the upper mounting groove of the negative electrode plastic.

[0019] As a further improvement of the present invention, an annular sunken portion is formed on the upper surface of the positive first pressure block and the upper surface of the negative first pressure block, respectively, and is located outside the rivet mounting hole. The upper end of the positive rivet and the upper end of the negative rivet are respectively expanded outward to form an upper annular boss. The upper annular boss of the positive rivet is embedded in the annular sunken portion of the positive first pressure block, and the upper annular boss of the negative rivet is embedded in the annular sunken portion of the negative first pressure block.

[0020] As a further improvement of the present invention, an annular sunken portion is formed on the lower surface of the positive electrode protection sheet and the lower surface of the negative electrode protection sheet, respectively, and is located outside the fifth rivet through-hole. The lower end portion of the positive electrode rivet and the lower end portion of the negative electrode rivet are respectively expanded outward to form a lower annular boss. The lower annular boss of the positive electrode rivet is embedded in the annular sunken portion of the positive electrode protection sheet, and the lower annular boss of the negative electrode rivet is embedded in the annular sunken portion of the negative electrode protection sheet.

[0021] As a further improvement of the present invention, it also includes:

[0022] At least one positive electrode sealing ring and at least one negative electrode sealing ring, the positive electrode sealing ring and the negative electrode sealing ring are both arranged between the bare aluminum sheet and the insulating lower bracket, and a positive electrode sealing ring through-hole corresponding to the first rivet through-hole and for the positive electrode rivet to pass through is formed on the positive electrode sealing ring, and a negative electrode sealing ring through-hole corresponding to the first rivet through-hole and for the negative electrode rivet to pass through is formed on the negative electrode sealing ring; the positive electrode sealing ring and the negative electrode sealing ring have the same structure, respectively including a lower ring body and an upper ring body formed on the lower ring body, the upper ring body of the positive electrode sealing ring is embedded in the first rivet through-hole and contacts with the plastic on the positive electrode, the lower ring body of the positive electrode sealing ring is embedded in the third rivet through-hole and contacts with the second positive electrode pressing block; the upper ring body of the negative electrode sealing ring is embedded in the first rivet through-hole and contacts with the plastic on the negative electrode, the lower ring body of the negative electrode sealing ring is embedded in the third rivet through-hole and contacts with the second negative electrode pressing block.

[0023] As a further improvement of the present invention, it also includes:

[0024] An explosion-proof structure comprising an explosion-proof valve and a protective film;

[0025] An explosion-proof valve mounting hole is formed on the plain aluminum sheet. The explosion-proof valve is arranged on the lower surface of the plain aluminum sheet and is installed corresponding to the explosion-proof valve mounting hole. The protective film is arranged on the upper surface of the plain aluminum sheet and is installed corresponding to the explosion-proof valve mounting hole. An explosion-proof valve corresponding area corresponding to the explosion-proof valve is formed on the insulating lower bracket.

[0026] The beneficial effects of the present invention are as follows: the positive electrode first pressing block, the positive electrode upper plastic, the plain aluminum sheet, the insulating lower bracket, the positive electrode second pressing block and the positive electrode protection sheet are riveted together by using positive electrode rivets, and the negative electrode first pressing block, the negative electrode upper plastic, the plain aluminum sheet, the insulating lower bracket, the negative electrode second pressing block and the negative electrode protection sheet are riveted together by using negative electrode rivets, that is, the positive electrode column and the negative electrode column are assembled on the plain aluminum sheet and the insulating lower bracket through the rivet riveting structure, the installation and assembly are convenient and quick, the overall processing technology is simplified, which is conducive to improving production efficiency and reducing production costs. At the same time, after assembly, the overall sealing effect is good, which is conducive to improving the sealing performance of the battery.

[0027] The above is an overview of the technical solution of the invention. The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front exploded view of the top cover assembly of the present invention;

[0029] Figure 2 This is an exploded view of the back of the top cover assembly of the present invention;

[0030] Figure 3 Schematic diagram of the front external structure of the top cover assembly of the present invention;

[0031] Figure 4 Schematic diagram of the back external structure of the top cover assembly of the present invention;

[0032] Figure 5 is a partial cross-sectional view of the top cover assembly of the present invention;

[0033] Figure 6 This is a cross-sectional view of the top cover assembly installed on the secondary battery in the present invention. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0035] Please refer to Figures 1 to 5 The embodiment of the present invention provides a novel top cover assembly 100 for a secondary battery, comprising:

[0036] A plain aluminum sheet 1, on which at least one first rivet hole 13 is formed;

[0037] A positive electrode upper plastic 2 and a negative electrode upper plastic 3 are both provided on the upper surface of the bare aluminum sheet 1, and at least one second rivet via hole (21, 31) corresponding to the first rivet via hole 13 is formed on the positive electrode upper plastic 2 and the negative electrode upper plastic 3 respectively; in this embodiment, the positive electrode upper plastic 2 functions to separate and insulate the following positive electrode first pressing block 4 from the bare aluminum sheet 1, and the negative electrode upper plastic 3 functions to separate and insulate the following negative electrode first pressing block 5 from the bare aluminum sheet 1;

[0038] A positive first pressing block 4 and a negative first pressing block 5, wherein the positive first pressing block 4 is arranged on the positive upper plastic 2, and the negative first pressing block 5 is arranged on the negative upper plastic 3, and at least one rivet mounting hole (41, 51) corresponding to the second rivet through hole (21, 31) is formed on the positive first pressing block 4 and the negative first pressing block 5 respectively; in this embodiment, the positive first pressing block 4 and the negative first pressing block 5 replace the positive pole column and the negative pole column in the existing injection molding structure, and are used for conducting and transmitting current;

[0039] An insulating lower bracket 6 is disposed below the bare aluminum sheet 1. The insulating lower bracket 6 is formed with at least one third rivet hole 61 corresponding to the first rivet hole 13. The provision of the insulating lower bracket 6 in this embodiment provides insulation between the bare aluminum sheet 1 and the first positive electrode pressing block 4, and between the bare aluminum sheet 1 and the second negative electrode pressing block 5.

[0040] A positive second pressing block 7 and a negative second pressing block 8 are both arranged on the lower surface of the insulating lower bracket 6, and at least one fourth rivet through hole (71, 81) corresponding to the third rivet through hole 61 is formed on the positive second pressing block 7 and the negative second pressing block 8 respectively; the functions of the positive second pressing block 7 and the negative second pressing block 8 in this embodiment are as follows: the lower annular boss 111 at the bottom of the positive rivet 11 is hooked on the bottom of the positive second pressing block 7, and the lower annular boss 121 at the bottom of the negative rivet 12 is hooked on the bottom of the negative second pressing block 8, so that the positive first pressing block 4 and the positive second pressing block 7, as well as the negative first pressing block 5 and the negative second pressing block 8 are combined to fix the insulating lower bracket 6, the positive sealing ring 20 and the negative sealing ring 30, the bare aluminum sheet 1, the positive upper plastic 2, and the negative upper plastic 3 into an integrated sealing structure;

[0041] a positive electrode protection sheet 9 and a negative electrode protection sheet 10, wherein the positive electrode protection sheet 9 is arranged on the lower surface of the positive electrode second pressing block 7, and the negative electrode protection sheet 10 is arranged on the lower surface of the negative electrode second pressing block 8, and at least one fifth rivet through hole (91, 101) corresponding to the fourth rivet through hole (71, 81) is formed on the positive electrode protection sheet 9 and the negative electrode protection sheet 10 respectively;

[0042] At least one positive electrode rivet 11 and at least one negative electrode rivet 12, the positive electrode rivet 11 passes through the fifth rivet through hole 91, the fourth rivet through hole 71, the third rivet through hole 61, the first rivet through hole 13, the second rivet through hole 21 and the rivet mounting hole 41 from bottom to top, and the two ends of the positive electrode rivet 11 are expanded due to the compression by the mold stamping, and the positive electrode first pressing block 4, the positive electrode upper plastic 2, the bare aluminum sheet 1, the insulating lower bracket 6, the positive electrode second pressing block 7 and the positive electrode protective The protective sheet 9 is riveted together; the negative electrode rivet 12 passes through the fifth rivet through hole 101, the fourth rivet through hole 81, the third rivet through hole 61, the first rivet through hole 13, the second rivet through hole 31 and the rivet mounting hole 51 from bottom to top, and the two ends of the negative electrode rivet 12 are expanded due to compression by mold stamping, and the negative electrode first pressing block 5, the negative electrode upper plastic 3, the bare aluminum sheet 1, the insulating lower bracket 6, the negative electrode second pressing block 8 and the negative electrode protective sheet 10 are riveted together.

[0043] The positive electrode first pressing block 4, the positive electrode upper plastic 2, the bare aluminum sheet 1, the insulating lower bracket 6, the positive electrode second pressing block 7 and the positive electrode protective sheet 9 are riveted together by using the positive electrode rivet 11, and the negative electrode first pressing block 5, the negative electrode upper plastic 3, the bare aluminum sheet 1, the insulating lower bracket 6, the negative electrode second pressing block 8 and the negative electrode protective sheet 10 are riveted together by using the negative electrode rivet 12. That is, the various components are assembled on the bare aluminum sheet 1 and the insulating lower bracket 6 through the rivet riveting structure, which is convenient and quick to install and assemble, and the overall processing technology is simplified, which is conducive to improving production efficiency and reducing production costs. At the same time, after assembly, the overall sealing effect is good, which is conducive to improving the sealing performance of the battery.

[0044] In this embodiment, if Figure 1 and Figure 5 As shown, a first boss 14 is provided on the upper surface of the light aluminum sheet 1 corresponding to the positive electrode plastic 2 and the negative electrode plastic 3, and the first rivet through hole 13 is formed on the first boss 14; Figure 2 As shown, a lower groove (22, 32) for the first boss 14 to be embedded is formed on the lower surface of the positive electrode upper plastic 2 and the lower surface of the negative electrode upper plastic 3, respectively. At the same time, at least one positioning convex ring (23, 33) is protruded downwardly in the lower groove (22, 32) and is located outside the second rivet through hole 21. The positioning convex ring (23, 33) is inserted into the first rivet through hole 13. By means of a structural design combining the first boss 14, the lower clamping groove (22, 32) and the positioning convex ring (23, 33), the positive electrode upper plastic 2 and the negative electrode upper plastic 3 are respectively positioned on the bare aluminum sheet 1, so that the structural combination between the positive electrode upper plastic 2 and the bare aluminum sheet 1, and between the negative electrode upper plastic 3 and the bare aluminum sheet 1, is more accurate, thereby facilitating the positive electrode rivet 11 to pass through the second rivet through hole 21 and be riveted and fixed to the first rivet through hole 13, and facilitating the negative electrode rivet 12 to pass through the second rivet through hole 31 and be riveted and fixed to the first rivet through hole 13, thereby improving assembly efficiency and the quality of assembled products.

[0045] In this embodiment, if Figure 1 and Figure 5 As shown, a second boss 62 is provided on the upper surface of the insulating lower bracket 6 corresponding to the positive electrode upper plastic 2 and the negative electrode upper plastic 3, and the third rivet through hole 61 is formed on the second boss 62; Figure 2 As shown, a first lower mounting groove 15 for the second boss 62 to be inserted into is formed on the lower surface of the bare aluminum sheet 1. By adopting the structural design in which the second boss 62 is inserted into the first lower mounting groove 15, the insulating lower bracket 6 is positioned on the bare aluminum sheet 1, and the structural connection between the insulating lower bracket 6 and the bare aluminum sheet 1 is more accurate, thereby facilitating the riveting and fixing of the positive electrode rivet 11 and the negative electrode rivet 12 through the first rivet through-hole 13 and the third rivet through-hole 61, thereby improving assembly efficiency and the quality of the assembled product.

[0046] In this embodiment, if Figure 1 and Figure 5 As shown, a third boss (72, 82) is protruded on the upper surface of the positive second pressing block 7 and the upper surface of the negative second pressing block 8, and the fourth rivet through hole (71, 81) is formed on the third boss (72, 82); Figure 2 As shown, two second lower mounting grooves 63 are formed on the lower surface of the insulating lower bracket 6 for the positive second pressing block 7 and the negative second pressing block 8 to be inserted, and a third lower mounting groove 64 is formed in the second lower mounting groove 63 for the third boss (72, 82) to be inserted. Through the structural design of the combination of the third boss (72, 82), the second lower mounting groove 63 and the third lower mounting groove 64, the positive second pressing block 7 and the negative second pressing block 8 are positioned on the insulating lower bracket 6, so that the structural connection between the positive second pressing block 7 and the insulating lower bracket 6, and between the negative second pressing block 8 and the insulating lower bracket 6 is more accurate, thereby facilitating the positive rivet 11 to pass through the third rivet through hole 61 and the fourth rivet through hole 71 for riveting and fixing, and facilitating the negative rivet 12 to pass through the third rivet through hole 61 and the fourth rivet through hole 81 for riveting and fixing, thereby improving assembly efficiency and product quality after assembly.

[0047] In this embodiment, if Figure 1 and Figure 5 As shown, a fourth boss (92, 102) corresponding to the fifth rivet through hole (91, 101) is formed on the upper surface of the positive electrode protection sheet 9 and the upper surface of the negative electrode protection sheet 10, respectively. The fifth rivet through hole (91, 101) is formed on the fourth boss (92, 102); Figure 2As shown, at least one fourth lower mounting groove (72, 82) is formed on the lower surface of the positive second pressing block 7 and the lower surface of the negative second pressing block 8, which is located outside the fourth rivet through-hole (71, 81) and for the fourth boss (92, 102) to be embedded. By adopting the structural design of the fourth boss (92, 102) being embedded in the fourth lower mounting groove (72, 82), the positive electrode protection sheet 9 is positioned on the positive second pressing block 7, and the negative electrode protection sheet 10 is positioned on the negative second pressing block 8, so that the structural combination between the positive electrode protection sheet 9 and the positive second pressing block 7, and between the negative electrode protection sheet 10 and the negative second pressing block 8 is more accurate, thereby facilitating the positive electrode rivet 11 to pass through the fourth rivet through-hole 71 and the fifth rivet through-hole 91 for riveting and fixing, and facilitating the negative electrode rivet 12 to pass through the fourth rivet through-hole 81 and the fifth rivet through-hole 101 for riveting and fixing, thereby improving assembly efficiency and product quality after assembly.

[0048] In this embodiment, if Figure 1 and Figure 5 As shown, an upper mounting groove (24, 34) is formed on the upper surface of the positive electrode upper plastic 2 and the upper surface of the negative electrode upper plastic 3 respectively, the second rivet through-hole (21, 31) penetrates the upper mounting groove (24, 34), the positive electrode first pressing block 4 is embedded in the upper mounting groove 24 of the positive electrode upper plastic 2, and the negative electrode first pressing block 5 is embedded in the upper mounting groove 34 of the negative electrode upper plastic 3. By adopting a structural design in which the positive first pressing block 4 is embedded in the upper mounting groove 24 of the positive upper plastic 2, and the negative first pressing block 5 is embedded in the upper mounting groove 34 of the negative upper plastic 3, the positive first pressing block 4 is positioned on the positive upper plastic 2, and the negative first pressing block 5 is positioned on the negative upper plastic 3, so that the structural combination between the positive first pressing block 4 and the positive upper plastic 2, and between the negative first pressing block 5 and the negative upper plastic 3 is more accurate, thereby facilitating the positive electrode rivet 11 to pass through the rivet mounting hole 41 and be riveted and fixed to the second rivet through-hole 21, and facilitating the negative electrode rivet 12 to pass through the rivet mounting hole 51 and be riveted and fixed to the second rivet through-hole 31, thereby improving assembly efficiency and product quality after assembly.

[0049] In this embodiment, if Figure 1 、 Figure 3 and Figure 5As shown, an annular sinking portion (42, 52) is formed on the upper surface of the positive first pressing block 4 and the upper surface of the negative first pressing block 5, respectively, and is located outside the rivet mounting hole (41, 51). The upper end of the positive rivet 11 and the upper end of the negative rivet 12 are respectively expanded outward to form an upper annular boss (110, 120). The upper annular boss 110 of the positive rivet 11 is embedded in the annular sinking portion 42 of the positive first pressing block 4, and the upper annular boss 120 of the negative rivet 12 is embedded in the annular sinking portion 52 of the negative first pressing block 5. The structural design of the annular sinking portions (42, 52) on the positive first pressing block 4 and the negative first pressing block 5 facilitates more stable riveting and fixing of the positive rivet 11 and the negative rivet 12, and the overall structure is more stable after assembly.

[0050] In this embodiment, if Figure 1 、 Figure 3 and Figure 5 As shown, an annular sunken portion (93, 103) is formed on the lower surface of the positive electrode protection sheet 9 and the lower surface of the negative electrode protection sheet 10, respectively, and is located outside the fifth rivet through hole (91, 101). The lower end of the positive electrode rivet 11 and the lower end of the negative electrode rivet 12 are respectively expanded outward to form a lower annular boss (111, 121). The lower annular boss 111 of the positive electrode rivet 11 is embedded in the annular sunken portion 93 of the positive electrode protection sheet 9, and the lower annular boss 121 of the negative electrode rivet 12 is embedded in the annular sunken portion 103 of the negative electrode protection sheet 10. The structural design of the annular sunken portions (93, 103) of the positive electrode protection sheet 9 and the negative electrode protection sheet 10 facilitates more stable riveting and fixing of the positive electrode rivet 11 and the negative electrode rivet 12, and the overall structure is more stable after assembly.

[0051] After the positive electrode rivet 11 passes through the fifth rivet through-hole 91, the fourth rivet through-hole 71, the third rivet through-hole 61, the first rivet through-hole 13, the second rivet through-hole 21 and the rivet mounting hole 41 from bottom to top, the two ends of the positive electrode rivet 11 are expanded by compression through mold stamping to form the above-mentioned upper annular boss 110 and lower annular boss 111, thereby riveting the positive electrode first pressing block 4, the positive electrode upper plastic 2, the bare aluminum sheet 1, the insulating lower bracket 6, the positive electrode second pressing block 7 and the positive electrode protective sheet 9 into one. Similarly, after the negative electrode rivet 12 passes through the fifth rivet hole 101, the fourth rivet hole 81, the third rivet hole 61, the first rivet hole 13, the second rivet hole 31, and the rivet mounting hole 51 from bottom to top, the ends of the negative electrode rivet 12 are compressed and expanded by die stamping to form the upper annular boss 120 and the lower annular boss 121, thereby riveting the negative electrode first pressing block 5, the negative electrode upper plastic 3, the bare aluminum sheet 1, the insulating lower bracket 6, the negative electrode second pressing block 8, and the negative electrode protective sheet 10 together. As a result, the positive electrode rivet 11 and the negative electrode rivet 12 more firmly rivet the entire structure, improving the stability of the overall structure.

[0052] In order to improve the sealing performance of the overall structure, the novel top cover assembly of this embodiment further includes:

[0053] At least one positive electrode sealing ring 20 and at least one negative electrode sealing ring 30, the positive electrode sealing ring 20 and the negative electrode sealing ring 30 are both arranged between the bare aluminum sheet 1 and the insulating lower bracket 6, and a positive electrode sealing ring through hole 201 corresponding to the first rivet through hole 13 and for the positive electrode rivet 11 to pass through is formed on the positive electrode sealing ring 20, and a negative electrode sealing ring through hole 301 corresponding to the first rivet through hole 13 and for the negative electrode rivet 12 to pass through is formed on the negative electrode sealing ring 30; the positive electrode sealing ring 20 and the negative electrode sealing ring 30 have the same structure, respectively including a lower ring body (202, 30 2), and an upper ring body (203, 303) formed on the lower ring body (202, 302), the upper ring body 202 of the positive electrode sealing ring 20 is embedded in the first rivet through-hole 13 and contacts the plastic 2 on the positive electrode, the lower ring body 202 of the positive electrode sealing ring 20 is embedded in the third rivet through-hole 61 and contacts the second positive electrode pressing block 7; the upper ring body 302 of the negative electrode sealing ring 30 is embedded in the first rivet through-hole 13 and contacts the plastic 3 on the negative electrode, the lower ring body 302 of the negative electrode sealing ring 30 is embedded in the third rivet through-hole 61 and contacts the second negative electrode pressing block 8. Since the bare aluminum sheet 1 is provided with a first rivet through-hole 13, in order to prevent the electrolyte in the battery from flowing out of the first rivet through-hole 13 of the bare aluminum sheet 1, the positive electrode sealing ring 20 and the negative electrode sealing ring 30 are used to seal to prevent the electrolyte from flowing out of the first rivet through-hole 13 of the bare aluminum sheet 1. Therefore, by adding the positive electrode sealing ring 20 and the negative electrode sealing ring 30, the sealing performance of the overall structure after assembly is significantly improved, which is beneficial to improving the sealing performance of the battery.

[0054] In this embodiment, the novel top cover assembly further includes:

[0055] The explosion-proof structure 40 includes an explosion-proof valve 401 and a protective film 402;

[0056] An explosion-proof valve mounting hole 16 is formed on the plain aluminum sheet 1, the explosion-proof valve 401 is arranged on the lower surface of the plain aluminum sheet 1 and is installed corresponding to the explosion-proof valve mounting hole 16, the protective film 402 is arranged on the upper surface of the plain aluminum sheet 1 and is installed corresponding to the explosion-proof valve mounting hole 16, and an explosion-proof valve corresponding area 65 corresponding to the explosion-proof valve 401 is formed on the insulating lower bracket 6.

[0057] When the pressure inside the battery reaches the explosion-proof valve 401 detonation pressure value, it can be directly connected to the outside through the explosion-proof valve corresponding area 65 and the explosion-proof valve installation hole 16, and quickly release air to prevent the high pressure inside the battery box from exploding.

[0058] In this embodiment, if Figure 1As shown, the number of the positive electrode rivet 11, the rivet mounting hole 41, the second rivet via hole 21, the first rivet via hole 13, the third rivet via hole 61, the fourth rivet via hole 71, the fifth rivet via hole 91, and the positive electrode sealing ring 20 are each two, and the number of the negative electrode rivet 12, the rivet mounting hole 51, the second rivet via hole 31, the first rivet via hole 13, the third rivet via hole 61, the fourth rivet via hole 81, the fifth rivet via hole 101, and the negative electrode sealing ring 30 are each two. Of course, the number of the above structures can also be increased or decreased according to the specific needs of the product.

[0059] The novel top cover assembly 100 of this embodiment is applied to a secondary battery, such as Figure 6 As shown, the novel top cover assembly 100 is installed at the opening of the aluminum shell 200 , and the battery cell 300 is inside the aluminum shell 200 .

[0060] In this embodiment, each structural shape shown in the drawings is only one of the shapes, but is not limited to these shapes and can also be set to other shapes according to the requirements of product structure design.

[0061] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, other structures obtained by adopting the same or similar technical features as the above-mentioned embodiments of the present invention are within the scope of protection of the present invention.

Claims

1. A novel top cover assembly for a secondary battery, characterized in that: include: a plain aluminum sheet, on which at least one first rivet hole is formed; A positive electrode upper plastic and a negative electrode upper plastic are both disposed on the upper surface of the plain aluminum sheet, and at least one second rivet via hole corresponding to the first rivet via hole is formed on each of the positive electrode upper plastic and the negative electrode upper plastic; A positive first pressing block and a negative first pressing block, wherein the positive first pressing block is disposed on the positive electrode upper plastic, and the negative first pressing block is disposed on the negative electrode upper plastic, and at least one rivet mounting hole corresponding to the second rivet through hole is formed on each of the positive first pressing block and the negative first pressing block; an insulating lower bracket, which is arranged below the plain aluminum sheet and has at least one third rivet through hole corresponding to the first rivet through hole formed on the insulating lower bracket; A positive second pressing block and a negative second pressing block are both arranged on the lower surface of the insulating lower bracket, and at least one fourth rivet through hole corresponding to the third rivet through hole is formed on each of the positive second pressing block and the negative second pressing block; a positive electrode protection sheet and a negative electrode protection sheet, wherein the positive electrode protection sheet is disposed on the lower surface of the second positive electrode pressing block, and the negative electrode protection sheet is disposed on the lower surface of the second negative electrode pressing block, and at least one fifth rivet through hole corresponding to the fourth rivet through hole is formed on each of the positive electrode protection sheet and the negative electrode protection sheet; At least one positive electrode rivet and at least one negative electrode rivet, the positive electrode rivet sequentially passing through the fifth rivet through hole, the fourth rivet through hole, the third rivet through hole, the first rivet through hole, the second rivet through hole and the rivet mounting hole from bottom to top, and the two ends of the positive electrode rivet are expanded due to compression by die stamping, and the first positive electrode pressing block, the positive electrode upper plastic, the bare aluminum sheet, the insulating lower bracket, the second positive electrode pressing block and the positive electrode protection sheet are riveted together; the negative electrode rivet sequentially passing through the fifth rivet through hole, the fourth rivet through hole, the third rivet through hole, the first rivet through hole, the second rivet through hole and the rivet mounting hole from bottom to top, and the two ends of the negative electrode rivet are expanded due to compression by die stamping, and the first negative electrode pressing block, the negative electrode upper plastic, the bare aluminum sheet, the insulating lower bracket, the second negative electrode pressing block and the negative electrode protection sheet are riveted together; An annular sunken portion is formed on the upper surface of the positive first pressing block and the upper surface of the negative first pressing block, respectively, and is located outside the rivet mounting hole. The upper end of the positive rivet and the upper end of the negative rivet are respectively expanded outward to form an upper annular boss. The upper annular boss of the positive rivet is embedded in the annular sunken portion of the positive first pressing block, and the upper annular boss of the negative rivet is embedded in the annular sunken portion of the negative first pressing block. An annular sunken portion is formed on the lower surface of the positive electrode protection sheet and the lower surface of the negative electrode protection sheet, respectively, and is located outside the fifth rivet through-hole. The lower end of the positive electrode rivet and the lower end of the negative electrode rivet are respectively expanded outward to form a lower annular boss. The lower annular boss of the positive electrode rivet is embedded in the annular sunken portion of the positive electrode protection sheet, and the lower annular boss of the negative electrode rivet is embedded in the annular sunken portion of the negative electrode protection sheet.

2. The novel top cover assembly of the secondary battery according to claim 1, characterized in that: A first boss is protruded on the upper surface of the bare aluminum sheet corresponding to the positive electrode upper plastic and the negative electrode upper plastic, and the first rivet through-hole is formed on the first boss; a lower groove for the first boss to be embedded is formed on the lower surface of the positive electrode upper plastic and the lower surface of the negative electrode upper plastic, and at the same time, at least one positioning convex ring is protruded downward in the lower groove and located outside the second rivet through-hole, and the positioning convex ring is inserted into the first rivet through-hole.

3. The novel top cover assembly of the secondary battery according to claim 1, characterized in that: A second boss is provided on the upper surface of the insulating lower bracket corresponding to the positive electrode upper plastic and the negative electrode upper plastic respectively, and the third rivet through hole is formed on the second boss; a first lower mounting groove for embedding the second boss is formed on the lower surface of the plain aluminum sheet.

4. The novel top cover assembly of a secondary battery according to claim 1, characterized in that: A third boss is respectively provided on the upper surface of the positive second pressure block and the upper surface of the negative second pressure block, and the fourth rivet through-hole is formed on the third boss; two second lower mounting grooves for embedding the positive second pressure block and the negative second pressure block are respectively formed on the lower surface of the insulating lower bracket, and a third lower mounting groove for embedding the third boss is formed in the second lower mounting groove.

5. The novel top cover assembly of the secondary battery according to claim 1, characterized in that: A fourth boss corresponding to the fifth rivet through-hole is formed on the upper surface of the positive electrode protection sheet and the upper surface of the negative electrode protection sheet, and the fifth rivet through-hole is formed on the fourth boss; at least one fourth lower mounting groove is formed on the lower surface of the positive electrode second pressure block and the lower surface of the negative electrode second pressure block, which is located outside the fourth rivet through-hole and for the fourth boss to be embedded.

6. The novel top cover assembly of a secondary battery according to claim 1, characterized in that: An upper mounting groove is formed on the upper plastic surface of the positive electrode and the upper plastic surface of the negative electrode respectively. The second rivet through-hole passes through the upper mounting groove. The positive electrode first pressing block is embedded in the upper mounting groove of the positive electrode plastic, and the negative electrode first pressing block is embedded in the upper mounting groove of the negative electrode plastic.

7. The novel top cover assembly of a secondary battery according to claim 1, characterized in that: Also includes: At least one positive electrode sealing ring and at least one negative electrode sealing ring, the positive electrode sealing ring and the negative electrode sealing ring are both arranged between the bare aluminum sheet and the insulating lower bracket, and a positive electrode sealing ring through-hole corresponding to the first rivet through-hole and for the positive electrode rivet to pass through is formed on the positive electrode sealing ring, and a negative electrode sealing ring through-hole corresponding to the first rivet through-hole and for the negative electrode rivet to pass through is formed on the negative electrode sealing ring; the positive electrode sealing ring and the negative electrode sealing ring have the same structure, respectively including a lower ring body and an upper ring body formed on the lower ring body, the upper ring body of the positive electrode sealing ring is embedded in the first rivet through-hole and contacts with the plastic on the positive electrode, the lower ring body of the positive electrode sealing ring is embedded in the third rivet through-hole and contacts with the second positive electrode pressing block; the upper ring body of the negative electrode sealing ring is embedded in the first rivet through-hole and contacts with the plastic on the negative electrode, the lower ring body of the negative electrode sealing ring is embedded in the third rivet through-hole and contacts with the second negative electrode pressing block.

8. The novel top cover assembly for a secondary battery according to any one of claims 1 to 7, characterized in that: Also includes: An explosion-proof structure comprising an explosion-proof valve and a protective film; An explosion-proof valve mounting hole is formed on the plain aluminum sheet. The explosion-proof valve is arranged on the lower surface of the plain aluminum sheet and is installed corresponding to the explosion-proof valve mounting hole. The protective film is arranged on the upper surface of the plain aluminum sheet and is installed corresponding to the explosion-proof valve mounting hole. An explosion-proof valve corresponding area corresponding to the explosion-proof valve is formed on the insulating lower bracket.

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