A lithium battery cover structure capable of increasing capacity

Abstract

The present invention discloses a lithium battery cover plate structure capable of increasing capacity, comprising a lower insulating pad, a cover plate covering the upper surface of the lower insulating pad, a negative electrode assembly and a positive electrode assembly arranged on the upper surface of the cover plate, a sunken negative electrode mounting seat arranged on the cover plate corresponding to the position of the negative electrode assembly, a supporting base supporting the negative electrode assembly is formed at the bottom of the sunken negative electrode mounting seat, and a through hole is arranged in the middle of the base plate, and the upper part of the sunken negative electrode mounting seat is folded inward to form a serrated flange portion. The present invention can increase the internal capacity of the lithium battery and ensure the stability of the performance of the lithium battery cover plate, reduce the number of assembled accessories, reduce processing costs, and reduce the difficulty of assembling accessories.

Description

Technical Field

[0001] The invention relates to a lithium battery cover plate structure capable of improving capacity. Background Art

[0002] When the power lithium battery is installed on the power vehicle, the lithium battery will be placed in a box to form a battery pack, which is closed by a cover plate, and the electrical conduction is achieved through the electrical components set on the cover plate. The positive electrode rivet and the negative electrode rivet are set on the lithium battery cover plate to achieve the conduction between the internal electrodes of the battery and the external electrical components. In order to ensure the sealing inside the battery, the sealing of the positive electrode rivet and the negative electrode rivet has always been one of the main considerations in the design of the lithium battery cover structure. In order to improve the cruising range of new energy vehicles, lightweight and battery capacity have also been research hotspots in this field.

[0003] In the prior art, the fixation of the positive and negative rivets of the battery cover is generally achieved by riveting a connecting structure on the upper and lower surfaces of the cover, and sealing rings are provided on the upper and lower surfaces of the cover. In addition, there are many electrode assemblies, which makes the internal resistance of the cover in mass production unstable and heavy, which is not conducive to improving the cruising range. Electrode assemblies are also provided on the lower surface of the cover, which affects the capacity inside the battery pack. When driving under various working conditions, the shaking of the vehicle body will cause the electrodes in the battery cover to loosen, resulting in poor contact, seriously affecting normal power supply.

[0004] Therefore, it is necessary to provide a new lithium battery cover structure that can improve the capacity to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a lithium battery cover plate structure that can increase the capacity of the lithium battery and ensure the stability of the performance of the lithium battery cover plate, reduce the number of assembled accessories, reduce processing costs, and reduce the difficulty of accessory assembly.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a lithium battery cover plate structure capable of improving capacity, comprising a lower insulating pad, a cover plate covering the upper surface of the lower insulating pad, a negative electrode assembly and a positive electrode assembly arranged on the upper surface of the cover plate, a sunken negative electrode mounting seat is arranged on the cover plate corresponding to the position of the negative electrode assembly, a supporting base supporting the negative electrode assembly is formed at the bottom of the sunken negative electrode mounting seat, and a through hole is arranged in the middle of the base, and the upper part of the sunken negative electrode mounting seat is folded inward to form a serrated flange portion to press and fix the negative electrode assembly on the cover plate.

[0007] Furthermore, it also includes an explosion-proof membrane embedded between the lower insulating pad and the cover plate.

[0008] Furthermore, the negative electrode assembly includes a sealing ring arranged in the sunken negative electrode mounting seat, a negative electrode rivet located on the sealing ring, and a negative electrode insulation pad that fixes and presses the sealing ring and the negative electrode rivet in the sunken negative electrode mounting seat.

[0009] Furthermore, a plurality of indentations are arranged on the circumferential surface of the negative electrode rivet, and a protrusion which is inserted into the indentations is arranged on the inner surface of the negative electrode insulation pad.

[0010] Furthermore, a step surface is formed on the upper surface of the negative electrode rivet and is pressed by the upper part of the negative electrode insulation pad.

[0011] Furthermore, the negative electrode insulation pad includes an inner shell and an outer shell, and an annular groove formed by the inner shell and the outer shell, and the serrated flange portion of the sunken negative electrode mounting seat is inserted into the annular groove to fix the negative electrode insulation pad.

[0012] Furthermore, the negative electrode insulation pad is a circular cover structure and the upper surface of the negative electrode rivet extends out of the upper surface of the negative electrode insulation pad.

[0013] Furthermore, the negative electrode insulation pad presses the negative electrode rivet by pressing the step surface, and the negative electrode insulation pad wraps the outer periphery of the sunken negative electrode mounting seat, and the compression is achieved through the serrated flange portion to obtain the anti-rotation torque.

[0014] Furthermore, a contoured storage groove is provided on the lower insulating pad corresponding to the position of the explosion-proof membrane, and the explosion-proof membrane is arranged in the contoured storage groove.

[0015] Furthermore, a contoured opening is arranged on the cover plate corresponding to the position of the explosion-proof membrane, and a surface sticker covering the explosion-proof membrane is arranged at the contoured opening.

[0016] Compared with the prior art, the beneficial effects of the lithium battery cover plate structure capable of increasing capacity of the present invention are: it can increase the internal capacity of the lithium battery and ensure the stability of the performance of the lithium battery cover plate, reduce the number of assembled accessories, reduce processing costs, and reduce the difficulty of assembling accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the explosion structure of an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a cover plate sunken negative electrode mounting seat in an embodiment of the present invention;

[0019] Figure 3 is a schematic cross-sectional view of the negative electrode assembly in the assembly structure of an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure of the negative electrode insulation pad in an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the negative electrode rivet in an embodiment of the present invention;

[0022] Description of reference numerals:

[0023] 100 A lithium battery cover structure capable of increasing capacity;

[0024] 1 lower insulating pad, 11 contoured storage groove; 2 cover plate, 21 sunken negative electrode mounting seat, 22 through hole, 23 serrated flange portion, 24 contoured through opening, 25 supporting base; 3 negative electrode assembly, 31 sealing ring, 32 negative electrode rivet, 321 inner concave notch, 322 step surface, 33 negative electrode insulating pad, 331 protrusion, 333 inner shell, 334 outer shell, 335 annular slot; 4 explosion-proof membrane; 5 positive electrode assembly; 6 surface sticker. DETAILED DESCRIPTION

[0025] Please refer to the accompanying drawings of the specification to further describe the present invention.

[0026] Please refer to Figure 1-Figure 5 The present embodiment provides a lithium battery cover structure 100 capable of improving capacity, which includes a lower insulating pad 1, a cover plate 2 covering the upper surface of the lower insulating pad 1, a negative electrode assembly 3 and a positive electrode assembly 4 arranged on the upper surface of the cover plate 2, and an explosion-proof membrane 5 embedded between the lower insulating pad 1 and the cover plate 2.

[0027] A sunken negative electrode mounting seat 21 is arranged on the cover plate 2 corresponding to the position of the negative electrode assembly 3, a supporting base 25 for supporting the negative electrode assembly 3 is formed at the bottom of the sunken negative electrode mounting seat 21, and a through hole 22 is arranged in the middle of the base, and the upper part of the sunken negative electrode mounting seat 21 is folded inward to form a serrated flange portion 23 to press and fix the negative electrode assembly 3 on the cover plate 2.

[0028] The negative electrode assembly 3 includes a sealing ring 31 disposed in the sunken negative electrode mounting seat 21 , a negative electrode rivet 32 ​​disposed on the sealing ring 31 , and a negative electrode insulating pad 33 fixing the sealing ring 31 and the negative electrode rivet 32 ​​in the sunken negative electrode mounting seat 21 .

[0029] A plurality of indentations 321 are provided on the circumferential surface of the negative electrode rivet 32, and a step surface 322 pressed by the upper part of the negative electrode insulation pad 33 is formed on the upper surface of the negative electrode rivet 32. A protrusion 331 inserted into the indentation 321 is provided on the inner surface of the negative electrode insulation pad 33. The negative electrode insulation pad 33 includes an inner shell 333 and an outer shell 334, and an annular groove 335 formed by the inner shell 333 and the outer shell 334, and the serrated flange portion 23 of the sunken negative electrode mounting seat 21 is inserted into the annular groove 335.

[0030] The negative electrode insulation pad 33 is a circular cover structure and the upper surface of the negative electrode rivet 32 ​​extends out of the upper surface of the negative electrode insulation pad 33. The negative electrode insulation pad 33 presses the negative electrode rivet 32 ​​by pressing the step surface 322, and the negative electrode insulation pad 33 wraps the outer periphery of the sunken negative electrode mounting seat 21, and is compressed and anti-rotation torque is obtained through the serrated flange portion 23. Through the flange design, force can be provided to the negative electrode insulation pad 33 to ensure the compression of the sealing ring 31 to meet the sealing performance of the lithium battery cover.

[0031] The cover plate 2 is provided with a profiling opening 24 corresponding to the explosion-proof membrane 5. The lower insulating pad 1 is provided with a profiling receiving groove 11 corresponding to the explosion-proof membrane 5, the explosion-proof membrane 5 is arranged in the profiling receiving groove 11, and a surface sticker 6 covering the explosion-proof membrane 5 is arranged at the profiling opening 24.

[0032] The positive electrode assembly 4 and the cover plate 2 are an integrated structure, and the cover plate 2 directly provides the positive electrode of the lithium battery.

[0033] The beneficial effects of the lithium battery cover plate structure 100 of the present embodiment that can improve the capacity are as follows: by arranging an inward serrated flange on the cover plate, a fastening support is provided for the negative electrode insulation pad, the negative electrode insulation pad is tightly pressed against the cover plate, and a torsional stopping force is provided, thereby greatly improving the stability and firmness of the installation of the negative electrode assembly; and both the negative electrode assembly and the positive electrode assembly can be installed on the upper surface of the cover plate, thereby increasing the space inside the lithium battery and increasing the energy density; the cover plate directly provides the positive electrode of the lithium battery without any other accessories, reducing the number of accessories, greatly reducing the weight of the lithium battery cover plate, and increasing the energy density; through the circumferential surface of the negative electrode rivet The concave notch arranged on the surface cooperates with the protrusion inside the negative electrode insulating pad to achieve the anti-rotation torque, and through the flange on the cover mounting seat, the flange is set to a serrated shape, so that the serrated flange can be stuck into the step surface of the inner wall of the negative electrode insulating pad to achieve the anti-rotation torque, thereby obtaining the anti-rotation torque of the lithium battery cover, improving the overall structural strength of the battery cover and the structural connection firmness; since the internal and external connections in this scheme are only through the negative electrode rivet and the inner wall of the sunken negative electrode mounting seat, there is no assembly combination of accessories, therefore, there is no problem of unstable internal resistance, and the consistency of the internal resistance value of the lithium battery cover is directly ensured by the material itself, and the charging and discharging heat generation temperature of the lithium battery cover can be indirectly reduced.

[0034] The technical content and technical features of the present invention have been disclosed as above, but those skilled in the art may still make various substitutions and modifications based on the enlightenment and disclosure of the present invention without departing from the spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the embodiments shown, but should include various substitutions and modifications without departing from the present invention, and be covered by the claims.

Claims

1. A lithium battery cover structure capable of increasing capacity, characterized in that: It includes a lower insulating pad, a cover plate covering the upper surface of the lower insulating pad, a negative electrode assembly and a positive electrode assembly arranged on the upper surface of the cover plate, a sunken negative electrode mounting seat is arranged on the cover plate corresponding to the position of the negative electrode assembly, a supporting base supporting the negative electrode assembly is formed at the bottom of the sunken negative electrode mounting seat, and a through hole is arranged in the middle of the base, and the upper part of the sunken negative electrode mounting seat is folded inward to form a serrated flange portion to press and fix the negative electrode assembly on the cover plate; the negative electrode assembly includes a sealing ring arranged in the sunken negative electrode mounting seat, a negative electrode rivet located on the sealing ring, and a negative electrode insulating ring that fixes and presses the sealing ring and the negative electrode rivet to the negative electrode in the sunken negative electrode mounting seat. pad; a plurality of concave notches are arranged on the circumferential surface of the negative electrode rivet, and a protrusion is arranged on the inner cavity surface of the negative electrode insulating pad to be inserted into the concave notches; a step surface is formed on the upper surface of the negative electrode rivet and is pressed by the upper part of the negative electrode insulating pad; the negative electrode insulating pad comprises an inner shell and an outer shell, and an annular groove formed by the inner shell and the outer shell, and the serrated flange portion of the sunken negative electrode mounting seat is inserted into the annular groove to fix the negative electrode insulating pad; the negative electrode insulating pad presses the negative electrode rivet by pressing the step surface, and the negative electrode insulating pad wraps the outer periphery of the sunken negative electrode mounting seat, and the serrated flange portion is used to achieve compression and obtain the anti-rotation torque.

2. The lithium battery cover structure capable of increasing capacity as claimed in claim 1, characterized in that: It also includes an explosion-proof membrane embedded between the lower insulating pad and the cover plate.

3. The lithium battery cover structure capable of increasing capacity as claimed in claim 1, characterized in that: The negative electrode insulation pad is a circular cover structure and the upper surface of the negative electrode rivet extends out of the upper surface of the negative electrode insulation pad.

4. The lithium battery cover structure capable of increasing capacity as claimed in claim 2, characterized in that: A contoured storage groove is arranged on the lower insulating pad corresponding to the position of the explosion-proof membrane, and the explosion-proof membrane is arranged in the contoured storage groove.

5. The lithium battery cover structure capable of increasing capacity as claimed in claim 4, characterized in that: The cover plate is provided with a contoured opening corresponding to the position of the explosion-proof membrane, and a surface sticker covering the explosion-proof membrane is provided at the contoured opening.

Images