CN217848120U

CN217848120U - 14500 lithium ion battery cap structure with explosion-proof function

Info

Publication number: CN217848120U
Application number: CN202220324750.4U
Authority: CN
Inventors: 蔡锦章; 罗令; 唐世弟
Original assignee: Dongguan Zhenhua New Energy Technology Co ltd
Current assignee: Dongguan Zhenhua New Energy Technology Co ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-11-18
Anticipated expiration: 2032-02-18

Abstract

The utility model relates to a 14500 lithium ion battery block structure with explosion-proof function, including stainless steel block main part (1), bottom packing ring (2), aluminium system rivet (3), top packing ring (4). The utility model discloses 14500 lithium ion battery's explosion-proof function can be realized, the explosion power after the battery became invalid can be effectively alleviateed to reduce the loss of property that the battery became invalid and the bodily injury that probably leads to.

Description

14500 lithium ion battery cap structure with explosion-proof function

Technical Field

The utility model relates to a 14500 lithium ion battery cap structure with explosion-proof function belongs to laser welding seal type cylinder 14500 lithium ion battery's safety protection technical field.

Background

Because of high energy density, lithium ion batteries are prone to safety problems such as fire and explosion under extreme conditions, such as heat, impact from collision, or poor processing. Ideally, when the battery is just failed, if the pressure relief and explosion prevention functions of the battery are good, high-temperature gas can be timely released, a large amount of heat and part of combustible electrolyte can be taken away, the explosion power can be greatly weakened, and the loss can be reduced.

The laser welding seal type cylindrical 14500 lithium ion battery is mainly characterized in that a battery shell and a cap are connected and sealed in a laser welding mode, the structure has larger capacity compared with a common rolling groove seal type lithium ion battery, but the explosion-proof function design of the laser welding seal type lithium ion battery is a difficult point at present, a plurality of explosion-proof structures are stamped at the bottom of a stainless steel shell at present, and the problem of easy crack generation is caused due to the large difficulty in precise stamping and processing of stainless steel materials. If the stamping is too deep, the shell is cracked and is easy to leak; the punching press is too shallow, then can not produce explosion-proof effects, the utility model discloses a 14500 lithium ion battery cap structure with explosion-proof function has avoided the difficulty of casing processing explosion-proof structure to this structure processing is simple, and explosion-proof function is better through test effect.

Disclosure of Invention

Because of high energy density, lithium ion batteries are prone to safety problems such as fire and explosion under extreme conditions, such as heat, impact due to collision, or poor processing. For reducing the laser welding seal type cylinder 14500 lithium ion battery's the casing processing degree of difficulty, improve this type lithium ion battery explosion-proof ability, the utility model discloses a 14500 lithium ion battery cap structure with explosion-proof function has avoided the difficulty of casing processing explosion-proof structure, and this structure processing is simple, and explosion-proof function is better through test effect, in case the abuse explosion problem appears, can break fast, reduces the explosion power of battery effectively, reduces the person and loss of property.

The utility model has the following concrete scheme: a14500 lithium ion battery cap structure with an explosion-proof function comprises a stainless steel cap body (1), a bottom gasket (2), an aluminum rivet (3) and a top gasket (4). The stainless steel cap is characterized in that the stainless steel cap body (1) is provided with a plurality of pressure relief small holes which are uniformly distributed, and the bottom gasket (2) and the top gasket (4) are used as insulating and sealing components and are fixed at the center of the stainless steel cap body (1) in a riveting mode through aluminum rivets (3). The stainless steel cap body (1) is provided with 8-10 pressure relief holes with the diameter of 0.8-1.2 mm, and the pressure relief holes are uniformly distributed on the surface of a circular ring outside the overlapping area of the stainless steel cap body (1) and the bottom gasket (2) and the top gasket (4). The bottom gasket (2) and the top gasket (4) are made of PFA plastic, the thickness is 0.6-0.8 mm, and the diameter is 6-8 mm. A through hole with the diameter of 2.2-3 mm is reserved in the center of the stainless steel cap main body (1) and used for enabling an aluminum rivet (3) to pass through, the diameter of the aluminum rivet (3) in the through hole is smaller than 2mm, and the stainless steel cap main body (1) and the aluminum rivet (3) are respectively used as a negative electrode end and a positive electrode end of a battery and are not in direct contact. The bottom gasket (2) and the top gasket (4) are respectively attached to the bottom surface and the top surface of the stainless steel cap body (1) and are fixed by aluminum rivets (3) in a riveting mode.

The utility model discloses a block and battery case are connected sealedly with laser welding's mode, stainless steel block main part (1) and aluminium system rivet (3) are connected as the negative pole and the positive pole of battery with the positive ear of book core respectively with the casing, bottom packing ring (2) and top packing ring (4) are fixed at stainless steel block main part (1) central point and are played the insulating seal effect as insulating and sealing part by aluminium system rivet (3), several pressure release aperture that stainless steel block main part (1) was reserved coats the epoxy glue water seal after the battery ization, can guarantee not the battery not weeping at ordinary times and do not absorb water, in case the battery abuse inefficacy, inside heat increases, the gas volume inflation, the epoxy glue on the pressure release hole can be washed away by high temperature gas, gaseous and heat fully release after, can reduce the inside temperature of battery, prevent the explosion that the too big result in the battery.

Drawings

Fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 are schematic structural diagrams of the present invention:

wherein: the stainless steel block comprises a stainless steel block body (1), a bottom gasket (2), an aluminum rivet (3) and a top gasket (4).

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

The utility model discloses a specific embodiment is: a14500 lithium ion battery cap structure with an explosion-proof function comprises a stainless steel cap body (1), a bottom gasket (2), an aluminum rivet (3) and a top gasket (4). The utility model discloses a aluminium system rivet (3) of block are connected well with the inside positive ear of battery when the assembly, treat to annotate the liquid and become to accomplish the back, and the mode of using laser welding is sealed the stainless steel block main part (1) of this utility model block with the battery case welding, then evenly pours into epoxy glue into in the pressure release aperture surface of stainless steel block main part (1) and covers sealedly completely, can accomplish the preparation after 6 hours stews. In the battery normal use process, this utility model block has conventional sealing performance and electrically conductive function, and the weeping does not absorb water, in case the battery abuse became invalid, epoxy glue on the pressure release hole can be washed away by high temperature gas, prevents the too big explosion that takes place in the battery.

Claims

1. A14500 lithium ion battery cap structure with explosion-proof function comprises a stainless steel cap body (1), a bottom gasket (2), an aluminum rivet (3) and a top gasket (4); the stainless steel cap is characterized in that the stainless steel cap body (1) is provided with a plurality of pressure relief small holes which are uniformly distributed, and the bottom gasket (2) and the top gasket (4) are used as insulating and sealing components and are fixed at the center of the stainless steel cap body (1) in a riveting mode through aluminum rivets (3).

2. The structure of 14500 li-ion battery cap with explosion-proof function as claimed in claim 1, wherein the stainless steel cap body (1) has 8-10 pressure relief holes with a diameter of 0.8-1.2 mm, and the pressure relief holes are uniformly distributed on the circular surface outside the overlapping region of the stainless steel cap body (1) and the bottom gasket (2) and the top gasket (4).

3. The structure of a 14500 li-ion battery cap with explosion-proof function as claimed in claim 1, wherein the bottom gasket (2) and the top gasket (4) are made of PFA plastic, with a thickness of 0.6-0.8 mm and a diameter of 6-8 mm.

4. The structure of 14500 Li-ion battery cap with explosion-proof function as claimed in claim 1, wherein a through hole with a diameter of 2.2-3 mm is reserved at the center of the stainless steel cap body (1) for the aluminum rivet (3) to pass through, the diameter of the aluminum rivet (3) in the through hole is less than 2mm, and the stainless steel cap body (1) and the aluminum rivet (3) are respectively used as the negative and positive terminals of the battery without direct contact.

5. The structure of 14500 li-ion battery cap with explosion-proof function as claimed in claim 1, wherein the bottom gasket (2) and the top gasket (4) are respectively attached to the bottom and top surfaces of the stainless steel cap body (1) and are fixed by aluminum rivets (3) in a riveting manner.