Battery top cover, single battery and electric equipment

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a battery top cover, a single battery and electric equipment. The battery top cover comprises a cover plate body, a pole column body and a clamping piece, wherein the cover plate body is provided with a pole column fixing hole; the pole body comprises a first part and a second part which are integrally formed up and down, the cross sectional area of the first part is larger than that of the second part, and the first part penetrates through the pole fixing hole; the clamping piece is provided with a clamping fixing hole, and the first part is arranged in the clamping fixing hole in a penetrating mode. Wherein a cover plate body is clamped between the clamping piece and the second part, any one of the pole body and the cover plate body is used for being electrically connected with a positive lug of a battery cell, and the other one is used for being electrically connected with a negative lug of the battery cell. According to the battery top cover, the sealing performance of the battery top cover can be improved, and the cross sectional area of the second part of the pole body is larger than that of the first part, so that the overcurrent capability of the pole body is improved, the production stability and the electrical performance of a single battery are improved, and meanwhile, the use safety of the battery top cover is also improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery top cover, a single battery cell, and an electrical device. Background Technology

[0002] Lithium-ion batteries are widely used in electric vehicles, portable electronic devices, and energy storage due to their high energy density and long cycle life. The battery top cover, as a crucial component of lithium-ion batteries, directly affects the battery's safety and lifespan. Existing battery top cover structures generally consist of electrode caps, a PTC (Positive Temperature Coefficient thermistor) for overcurrent protection, an explosion-proof aluminum sheet, a sealing ring, connecting aluminum sheets, and a small insulating rubber ring. These components are connected and assembled using mechanical or adhesive seals. However, due to limitations in manufacturing processes and prolonged use, the battery's sealing performance, safety, and production stability can decline, potentially leading to safety accidents.

[0003] Therefore, there is an urgent need to provide a new type of battery top cover, single battery cell, and electrical device to solve the above-mentioned technical problems in the prior art. Utility Model Content

[0004] The purpose of this utility model is to provide a battery top cover that can improve the sealing performance of the battery top cover, increase the current carrying capacity, improve the production stability and electrical performance of the single battery, and at the same time improve its safety in use.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The battery top cover includes a cover plate body, a terminal post body, and a snap-fit ​​component. The cover plate body is provided with a terminal post fixing hole. The terminal post body includes a first part and a second part integrally formed, with the cross-sectional area of ​​the first part being larger than that of the second part. The first part passes through the terminal post fixing hole. The snap-fit ​​component is provided with a snap-fit ​​fixing hole, with the first part passing through the snap-fit ​​fixing hole. The cover plate body is sandwiched between the snap-fit ​​component and the second part. Either the terminal post body or the cover plate body is used to electrically connect to the positive electrode tab of the battery cell, and the other is used to electrically connect to the negative electrode tab of the battery cell.

[0007] Optionally, the circumferential inner wall of the aforementioned snap-fit ​​fixing hole is provided with a snap-fit ​​step, and the circumferential outer wall of the aforementioned first part is formed with a snap-fit ​​groove that engages and connects with the aforementioned snap-fit ​​step.

[0008] Optionally, the bottom wall of the aforementioned snap-fit ​​step is flush with the bottom wall of the aforementioned snap-fit ​​member.

[0009] Optionally, the top wall of the first part is flush with the top wall of the clamping piece.

[0010] Optionally, the clamping piece, the first part and the second part form a pole assembly, and an insulating sealing ring is clamped between the pole assembly and the cover body.

[0011] Optionally, the insulating sealing ring comprises a first sealing part, a second sealing part and a third sealing part connected in sequence, the first sealing part abuts against the top wall of the cover body, the second sealing part abuts against the circumferential inner wall of the pole fixing hole, and the third sealing part abuts against the bottom wall of the cover body.

[0012] Optionally, the outer diameter of the first sealing part is not less than the outer diameter of the clamping piece, and the outer diameter of the third sealing part is not less than the outer diameter of the second part.

[0013] Optionally, the pole body is used for welding fixing the positive lug of the electric core, the pole body and the positive lug of the electric core are made of aluminum profiles, and the cover body and the clamping piece are made of steel profiles.

[0014] Another purpose of the utility model is to provide a single battery, which comprises the battery top cover of any of the above-mentioned schemes.

[0015] Still another purpose of the utility model is to provide a power consumption equipment, which comprises the single battery of the above-mentioned scheme.

[0016] Beneficial effects:

[0017] The battery top cover in the utility model is connected with the battery shell through the cover body, so that the electric core of the single battery can be accommodated, any one of the positive lug and the negative lug of the electric core is electrically connected to the cover body, and the other is connected to the pole body, so that the pole body and the cover body form the positive pole and the negative pole of the single battery, the charging and discharging of the electric core and external equipment are realized, the first part and the second part of the pole body are integrally formed in an up-down mode, the clamping fixing hole of the clamping piece is clamped and fixed to the first part, the pole body is fixed on the cover body through the clamping of the clamping piece and the second part, no additional insulating small rubber ring is needed, the aging problem of the sealing rubber ring in the use process of the battery can be avoided, the sealing performance of the battery top cover can be improved, the cross-sectional area of the second part of the pole body is larger than that of the first part, the overcurrent capacity of the pole body is increased, the production stability and electrical performance of the single battery are improved, and the safety in use is also improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the longitudinal sectional view of the battery top cover provided in the specific embodiment of the utility model.

[0019] In the drawings:

[0020] 100, cover plate body; 110, pole fixing hole; 120, liquid injection hole;

[0021] 200, pole body; 210, first part; 211, clamping groove; 220, second part;

[0022] 300, clamping piece; 310, clamping fixing hole; 311, clamping step;

[0023] 400, insulating sealing ring; 410, first sealing part; 420, second sealing part; 430, third sealing part. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0025] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; It can be mechanical connection, or electrical connection; It can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In the utility model, unless otherwise explicitly specified and limited, the first feature is "on" or "below" the second feature, which can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0028] Please refer to Figure 1 The battery top cover includes a cover body 100, a pole body 200, and a clamping piece 300. The cover body 100 is provided with a pole fixing hole 110. The pole body 200 includes a first part 210 and a second part 220 integrally formed in an up-down direction. The cross-sectional area of the first part 210 is larger than that of the second part 220. The first part 210 is arranged in the pole fixing hole 110. The clamping piece 300 is provided with a clamping fixing hole 310. The first part 210 is arranged in the clamping fixing hole 310. The cover body 100 is clamped between the clamping piece 300 and the second part 220. Either the pole body 200 or the cover body 100 is used to electrically connect the positive tab of the cell, and the other is used to electrically connect the negative tab of the cell.

[0029] The battery top cover in the present embodiment is connected with the battery shell by the cover body 100, thereby accommodating the cell of the single battery. Either the positive tab or the negative tab of the cell is electrically connected to the cover body 100, and the other is connected to the pole body 200, so that the pole body 200 and the cover body 100 form the positive and negative poles of the single battery, realizing the charging and discharging of the cell and external equipment. The pole body 200 includes the first part 210 and the second part 220 integrally formed in the up-down direction. The first part 210 is clamped and fixed in the clamping fixing hole 310 of the clamping piece 300. The first part 210 is arranged in the pole fixing hole 110 of the cover body 100. The pole body 200 is fixed on the cover body 100 by clamping and fixing of the clamping piece 300 and the second part 220, without the need for an additional small insulating rubber ring, which can avoid the aging problem of the sealing rubber ring during use of the battery, improve the sealing performance of the battery top cover, and increase the cross-sectional area of the second part 220 of the pole body 200, thereby increasing the overcurrent capacity of the pole body 200, improving the production stability and electrical performance of the single battery, and improving the safety of use.

[0030] Further, the circumferential inner wall of the clamping fixing hole 310 is provided with a clamping step 311, and the circumferential outer wall of the first part 210 is formed with a clamping groove 211 matched with the clamping step 311. Through the cooperation of the clamping step 311 and the clamping groove 211, the clamping of the clamping piece 300 and the first part 210 can be realized; specifically, the clamping groove 211 is formed on the outer wall surface of the first part 210 after machining, and after the first part 210 is inserted into the clamping fixing hole 310, the inner wall of the clamping piece 300 can be extruded into the clamping groove 211 to form the clamping step 311, which will not be described here.

[0031] In the embodiment, the bottom wall of the clamping step 311 is flush with the bottom wall of the clamping piece 300; further, the top wall of the first part 210 is flush with the top wall of the clamping piece 300. That is, after the clamping piece 300 and the first part 210 are riveted and fixed, the top end of the first part 210 protruding out of the pole fixing hole 110 is in an inverted "convex" shape, and the clamping piece 300 and the first part 210 form an integral whole, reducing the space occupied by the clamping piece 300 in the vertical direction and improving the energy density of the single battery.

[0032] It should be noted that the cover body 100 is also provided with a liquid injection hole 120 for filling electrolyte, and after filling is completed, the liquid injection hole 120 is sealed by laser welding with a steel ball or a steel nail, which will not be described here.

[0033] Optionally, the clamping piece 300, the first part 210 and the second part 220 form a pole assembly, and the insulating sealing ring 400 is arranged between the pole assembly and the cover body 100. The arrangement of the insulating sealing ring 400 can realize the insulation between the pole assembly and the cover body 100, and the insulating sealing ring can further improve the sealing performance between the pole assembly and the cover body 100, which will not be described here.

[0034] The insulating sealing ring 400 is made of Teflon material with high temperature resistance and corrosion resistance, so as to have better insulation and sealing effect, and has longer service life with aging resistance and electrolyte corrosion resistance.

[0035] Please continue to refer to Figure 1The insulation sealing ring 400 comprises a first sealing portion 410, a second sealing portion 420 and a third sealing portion 430 connected end to end, the first sealing portion 410 abuts against the top wall of the cover plate body 100, the second sealing portion 420 abuts against the circumferential inner wall of the pole post fixing hole 110, and the third sealing portion 430 abuts against the bottom wall of the cover plate body 100. The insulation sealing ring 400 in the embodiment is three-sectioned, comprising the first sealing portion 410, the second sealing portion 420 and the third sealing portion 430, so that three seals can be formed between the pole post assembly and the cover plate body 100, the sealing effect is further improved, electrolyte leakage is avoided, and the safety and reliability of the single battery using the battery top cover are improved.

[0036] Optionally, the outer diameter of the first sealing portion 410 is not less than the outer diameter of the clamping piece 300, and the outer diameter of the third sealing portion 430 is not less than the outer diameter of the second portion 220. Through such a design, the first sealing portion 410 can completely cover the space between the clamping piece 300 and the cover plate body 100, and the third sealing portion 430 can completely cover the space between the second portion 220 and the cover plate body 100, so that the gap between the pole post assembly and the cover plate body 100 is completely filled, and the insulation performance and sealing performance of the insulation sealing ring 400 are further improved.

[0037] In the embodiment, the pole post body 200 is used for welding and fixing the positive lug of the battery cell, the pole post body 200 and the positive lug of the battery cell are both made of aluminum profile, and the cover plate body 100 and the clamping piece 300 are both made of steel profile. Thus, when the pole post body 200 is welded with the positive lug, the positive lug made of the same material as the pole post body 200 is easier to be welded, the welding point will not be separated in the frequent switching between high temperature and low temperature use, and the welding fixing effect is better.

[0038] Further, an annular insulation sealing piece is arranged between the cover plate body 100 and the battery shell and is fixed by laser welding fusion. Compared with the traditional mechanical pressing mode, the sealing performance is greatly improved, so that the liquid leakage at the electrical connection is avoided, and the service life and safety of the single battery are improved.

[0039] The embodiment also provides a single battery comprising the battery top cover in any of the above-mentioned embodiments. The single battery can be a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The single battery can also be a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery or a sodium-ion battery, or a magnesium-ion battery, etc., which will not be described here. The single battery has the beneficial effects of the battery top cover in any of the above-mentioned embodiments, which will not be described here.

[0040] Specifically, the monomer battery uses the battery top cover, does not need additional insulation small rubber ring, can avoid the aging problem of the sealing rubber ring in the use process of the battery, can improve the sealing performance of the battery top cover, and the second part 220 of the pole body 200 is larger than the first part 210, the cross-sectional area of the pole body 200 is increased, the production stability and electrical performance of the monomer battery are improved, and the safety of use is also improved.

[0041] The embodiment further provides a kind of electric equipment, which includes the monomer battery described in the above scheme.The electric equipment can be electric bicycle, electric vehicle, hybrid vehicle, ship, energy storage device, etc., as long as using electric energy as energy source, which will not be described here.

[0042] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery top cover characterized by, The battery top cover comprises a cover plate body (100) provided with a pole post fixing hole (110); a pole post body (200) comprising a first part (210) and a second part (220) integrally formed in an up-down direction, the cross-sectional area of the first part (210) being larger than that of the second part (220), the first part (210) being arranged in the pole post fixing hole (110); and a clamping piece (300) provided with a clamping fixing hole (310), the first part (210) being arranged in the clamping fixing hole (310); wherein the clamping piece (300) and the second part (220) are clamped with the cover plate body (100) therebetween, any one of the pole post body (200) and the cover plate body (100) being used for electrically connecting a positive electrode tab of a battery cell, and the other being used for electrically connecting a negative electrode tab of the battery cell. The circumferential inner wall of the clamping fixing hole (310) is provided with a clamping step (311), and the circumferential outer wall of the first part (210) is formed with a clamping groove (211) matched with the clamping step (311). The bottom wall of the clamping step (311) is flush with the bottom wall of the clamping piece (300). The top wall of the first part (210) is flush with the top wall of the clamping piece (300).

2. The battery header of claim 1, wherein, The clamping piece (300), the first part (210) and the second part (220) constitute a pole post assembly, and the pole post assembly and the cover plate body (100) are clamped with an insulating sealing ring (400) therebetween.

3. The battery cup of claim 2, wherein: The insulating sealing ring (400) comprises a first sealing part (410), a second sealing part (420) and a third sealing part (430) connected in a head-tail manner, the first sealing part (410) abutting against the top wall of the cover plate body (100), the second sealing part (420) abutting against the circumferential inner wall of the pole post fixing hole (110), and the third sealing part (430) abutting against the bottom wall of the cover plate body (100).

4. The battery header of claim 3, wherein, The outer diameter of the first sealing part (410) is not less than that of the clamping piece (300), and the outer diameter of the third sealing part (430) is not less than that of the second part (220).

5. The battery cover of claim 1, wherein, The pole post body (200) is used for welding and fixing the positive electrode tab of the battery cell, the pole post body (200) and the positive electrode tab of the battery cell are both made of aluminum profiles, and the cover plate body (100) and the clamping piece (300) are both made of steel profiles.

6. The battery header of claim 5, wherein, The battery top cover comprises a cover plate body (100) provided with a pole post fixing hole (110); a pole post body (200) comprising a first part (210) and a second part (220) integrally formed in an up-down direction, the cross-sectional area of the first part (210) being larger than that of the second part (220), the first part (210) being arranged in the pole post fixing hole (110); and a clamping piece (300) provided with a clamping fixing hole (310), the first part (210) being arranged in the clamping fixing hole (310); wherein the clamping piece (300) and the second part (220) are clamped with the cover plate body (100) therebetween, any one of the pole post body (200) and the cover plate body (100) being used for electrically connecting a positive electrode tab of a battery cell, and the other being used for electrically connecting a negative electrode tab of the battery cell.

7. The battery header of claim 6, wherein, The battery top cover comprises a cover plate body (100) provided with a pole post fixing hole (110); a pole post body (200) comprising a first part (210) and a second part (220) integrally formed in an up-down direction, the cross-sectional area of the first part (210) being larger than that of the second part (220), the first part (210) being arranged in the pole post fixing hole (110); and a clamping piece (300) provided with a clamping fixing hole (310), the first part (210) being arranged in the clamping fixing hole (310); wherein the clamping piece (300) and the second part (220) are clamped with the cover plate body (100) therebetween, any one of the pole post body (200) and the cover plate body (100) being used for electrically connecting a positive electrode tab of a battery cell, and the other being used for electrically connecting a negative electrode tab of the battery cell.

8. The battery header of any one of claims 1-7, wherein, ​ 9. A single cell characterized by ​ 10. An electrical device, characterized by ​

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