Low-resistance lithium ion battery cap

Abstract

The utility model relates to the field of lithium ion batteries, in particular to a low-resistance lithium ion battery cap, which comprises a lithium ion battery shell and an insulating cap body, the insulating cap body is detachably mounted at the top of the lithium ion battery shell through a connecting component, and a pore plate is fixed at the bottom of the insulating cap body. An anti-explosion piece and a top cover are arranged in the insulating cap body, the bottom end of the anti-explosion piece is welded to the top end of the pore plate through laser, the top end of the anti-explosion piece is welded to the bottom end of the top cover through laser, and a positive terminal is fixed to the center of the top end of the top cover. And moreover, the insulation cap body and the lithium ion battery shell are convenient to disassemble and assemble, so that the subsequent maintenance is convenient, and the practicability is improved.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion batteries, in particular to a low-resistance lithium ion battery cap. Background Art

[0002] Lithium-ion battery is a battery that uses lithium ions to move back and forth between positive and negative electrodes to store and release electrical energy. It is one of the most widely used rechargeable batteries and is commonly found in mobile phones, laptops, electric vehicles and other devices. Lithium-ion batteries are usually composed of positive electrodes, diaphragms, negative electrodes, organic electrolytes and lithium-ion battery casings.

[0003] At present, the battery cap of lithium-ion batteries is usually encapsulated in an insulating cap body by a top cover and an explosion-proof plate. The insulating cap body is generally fixed to the lithium-ion battery shell by a rolled edge wrapping method, which is inconvenient to disassemble and is not conducive to subsequent maintenance.

[0004] Therefore, it is necessary to invent a low-resistance lithium-ion battery cap. Utility Model Content

[0005] To this end, the utility model provides a low-resistance lithium-ion battery cap to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-resistance lithium-ion battery cap, comprising a lithium-ion battery shell and an insulating cap body, the insulating cap body being detachably mounted on the top of the lithium-ion battery shell through a connecting assembly, a perforated plate being fixed at the bottom of the insulating cap body, an explosion-proof disk and a top cover being arranged inside the insulating cap body, the bottom end of the explosion-proof disk being laser welded to the top end of the perforated plate, the top end of the explosion-proof disk being laser welded to the bottom end of the top cover, and a positive electrode terminal being fixed at the center of the top end of the top cover.

[0007] Preferably, the connecting assembly comprises an annular baffle, the outer ring surface of which is fixed on the upper side of the inner surface of the lithium-ion battery housing, a through hole is provided at the center of the annular baffle, and the bottom end of the insulating cap body passes through the through hole.

[0008] Preferably, a sealing gasket is bonded to the top edge of the annular baffle, and the surface of the insulating cap body fits the top of the sealing gasket.

[0009] Preferably, the connecting assembly further comprises a plurality of opening grooves, which are arranged in a circular array on the upper side of the outer surface of the lithium-ion battery housing, a threaded hole is arranged in the center of the opening groove, and a plurality of threaded grooves are arranged in a circular array on the outer surface of the insulating cap body, and the threaded holes correspond to the threaded grooves one by one.

[0010] Preferably, the threaded holes are threadedly connected with fixing screws, and the inner ends of the fixing screws are threadedly connected to the inner surfaces of the corresponding thread grooves.

[0011] Preferably, a metal head is sleeved on the outer side of the positive electrode terminal, and the outer surface of the positive electrode terminal is threadedly connected to the inner surface of the metal head.

[0012] The beneficial effects of the utility model are as follows: through the coordinated use of the lithium-ion battery shell, insulating cap body, connecting assembly, orifice plate, explosion-proof disk, top cover and positive electrode terminal, the top cover, explosion-proof disk and orifice plate are welded and connected, which effectively reduces the contact resistance, and the insulating cap body and the lithium-ion battery shell are easy to disassemble and assemble, thereby facilitating subsequent maintenance and improving practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural cross-sectional view provided by the utility model;

[0014] Figure 2 for Figure 1 A magnified view of the structure at A;

[0015] Figure 3 for Figure 1 A magnified view of the structure at B in FIG.

[0016] Figure 4 for Figure 1 A magnified view of the structure at C in FIG.

[0017] Figure 5 This is a front view of the structure provided by the utility model.

[0018] In the figure: 1. lithium-ion battery casing; 2. insulating cap; 3. perforated plate; 4. explosion-proof plate; 5. top cover; 6. positive terminal; 7. annular baffle; 8. through hole; 9. sealing gasket; 10. opening groove; 11. threaded hole; 12. threaded groove; 13. fixing screw; 14. metal head. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Please refer to the attached Figure 1-5The utility model provides a low-resistance lithium-ion battery cap, comprising a lithium-ion battery housing 1 and an insulating cap body 2, the insulating cap body 2 is detachably mounted on the top of the lithium-ion battery housing 1 through a connecting assembly, a perforated plate 3 is fixed to the bottom of the insulating cap body 2, an explosion-proof disc 4 and a top cover 5 are arranged inside the insulating cap body 2, the bottom end of the explosion-proof disc 4 is laser welded to the top end of the perforated plate 3, the top end of the explosion-proof disc 4 is laser welded to the bottom end of the top cover 5, a positive electrode terminal 6 is fixed to the center of the top end of the top cover 5, and the positive electrode terminal 6 and the top cover 5 are preferably set as an integrated structure. In summary, the utility model can make the top cover 5, the explosion-proof disc 4 and the perforated plate 3 welded, effectively reduce the contact resistance, and achieve a low resistance effect;

[0021] The connection assembly includes an annular baffle 7, the outer ring surface of the annular baffle 7 is fixed on the upper side of the inner surface of the lithium-ion battery housing 1, a through hole 8 is provided in the center of the annular baffle 7, the bottom end of the insulating cap body 2 passes through the through hole 8, a sealing gasket 9 is bonded to the top edge of the annular baffle 7, and the surface of the insulating cap body 2 fits the top of the sealing gasket 9. Specifically, under the action of the sealing gasket 9, the sealing performance of the insulating cap body 2 and the lithium-ion battery housing 1 after installation can be effectively improved, and leakage can be effectively prevented;

[0022] The connection assembly also includes a plurality of open grooves 10, which are arranged in a circular array on the upper side of the outer surface of the lithium-ion battery housing 1, and a threaded hole 11 is arranged in the center of the open groove 10. A plurality of threaded grooves 12 are arranged in a circular array on the outer surface of the insulating cap body 2, and the threaded holes 11 correspond to the threaded grooves 12 one by one. The insides of the threaded holes 11 are all threadedly connected with fixing screws 13, and the inner ends of the fixing screws 13 are threadedly connected to the inner surfaces of the corresponding threaded grooves 12. Specifically, under the fixing action of the plurality of open grooves 10, the threaded holes 11, the threaded grooves 12 and the fixing screws 13, the insulating cap body 2 can be detachably mounted on the lithium-ion battery housing 1, that is, the insulating cap body 2 and the lithium-ion battery housing 1 are conveniently disassembled and assembled, thereby facilitating subsequent maintenance and improving practicality.

[0023] A metal head 14 is sleeved on the outside of the positive terminal 6. It should be noted that the metal head 14 is preferably made of copper with good conductivity. The outer surface of the positive terminal 6 is threadedly connected to the inner surface of the metal head 14. Specifically, those skilled in the art can control the extension and retraction of the metal head 14 by rotating the metal head 14 in the forward and reverse directions, thereby adjusting the effective length of the positive terminal 4 to facilitate wiring operations.

[0024] The use process of the utility model is as follows: first, the utility model makes a welding connection between the top cover 5, the explosion-proof disk 4 and the orifice plate 3, which effectively reduces the contact resistance and achieves a low resistance effect; secondly, under the fixing action of a plurality of open grooves 10, threaded holes 11, threaded grooves 12 and fixing screws 13, the insulating cap body 2 can be detachably installed on the lithium-ion battery housing 1, and the technicians in this field only need to control the disassembly and assembly operation between the insulating cap body 2 and the lithium-ion battery housing 1 by disassembling and assembling the fixing screws 13, thereby facilitating subsequent maintenance and improving practicality.

[0025] The above is only a preferred embodiment of the utility model. Any person skilled in the art can modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A low-resistance lithium-ion battery cap, comprising a lithium-ion battery housing (1) and an insulating cap body (2), characterized in that: The insulating cap body (2) is detachably mounted on the top of the lithium-ion battery housing (1) via a connecting assembly; a perforated plate (3) is fixed to the bottom of the insulating cap body (2); an explosion-proof disc (4) and a top cover (5) are arranged inside the insulating cap body (2); the bottom end of the explosion-proof disc (4) is laser welded to the top end of the perforated plate (3); the top end of the explosion-proof disc (4) is laser welded to the bottom end of the top cover (5); and a positive electrode terminal (6) is fixed to the center of the top end of the top cover (5).

2. A low resistance lithium ion battery cap according to claim 1, characterized in that: The connection assembly comprises an annular baffle (7), the outer ring surface of the annular baffle (7) is fixed on the upper side of the inner surface of the lithium-ion battery housing (1), a through hole (8) is provided at the center of the annular baffle (7), and the bottom end of the insulating cap body (2) passes through the through hole (8).

3. A low resistance lithium ion battery cap according to claim 2, characterized in that: A sealing gasket (9) is bonded to the top edge of the annular baffle (7), and the surface of the insulating cap body (2) fits the top of the sealing gasket (9).

4. A low resistance lithium ion battery cap according to claim 3, characterized in that: The connection assembly further comprises a plurality of opening grooves (10), the plurality of opening grooves (10) being arranged in a circular array on the upper side of the outer surface of the lithium-ion battery housing (1), a threaded hole (11) being arranged at the center of the opening groove (10), and a plurality of threaded grooves (12) being arranged in a circular array on the outer surface of the insulating cap body (2), the threaded holes (11) corresponding to the threaded grooves (12) respectively.

5. The low resistance lithium ion battery cap according to claim 4, characterized in that: The threaded holes (11) are all threadedly connected with fixing screws (13), and the inner ends of the fixing screws (13) are threadedly connected to the inner surfaces of the corresponding thread grooves (12).

6. The low resistance lithium ion battery cap according to claim 1, characterized in that: A metal head (14) is sleeved on the outer side of the positive electrode terminal (6), and the outer surface of the positive electrode terminal (6) is threadedly connected to the inner surface of the metal head (14).

Images