CN214043908U

CN214043908U - Lithium battery bidirectional safety valve device

Info

Publication number: CN214043908U
Application number: CN202022849085.4U
Authority: CN
Inventors: 罗雨浓; 陈小平; 付阳锋; 刘平亮
Original assignee: Hunan Times United New Energy Co ltd
Current assignee: Hunan Times United New Energy Co ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-08-24
Anticipated expiration: 2030-12-01

Abstract

The utility model provides a lithium battery two-way safety valve device, which comprises a lithium ion battery main body, a cover plate safety valve hole and a two-way safety valve; the utility model discloses can solve present lithium cell and make and annotate liquid valve and relief valve and all be detached technical defect problem, provide a lithium cell two-way safety valve, can annotate the liquid in battery production process after installing this two-way safety valve, annotate liquid and accomplish back self-sealing, carry out the pressure release automatically when battery internal pressure is too big and exhaust, resume encapsulated situation again after battery internal pressure resumes normally.

Description

Lithium battery bidirectional safety valve device

Technical Field

The utility model relates to a battery field, in particular to lithium cell two-way safety valve device.

Background

At present, the lithium battery is mature in production process, simple to assemble in the using process and widely applied to the fields of electric automobiles, low-speed vehicles, energy storage, ships, communication base stations and the like. However, when a lithium battery is used, when the lithium battery is affected by abnormal factors such as short circuit, over-discharge, overcharge, high temperature and collision, a chemical reaction is easily generated inside the battery to generate high-pressure gas, which may cause the expansion deformation of the battery and even the danger of explosion and fire, and in order to prevent the potential safety hazard caused by the rise of the internal pressure of the battery during the use of the battery, an exhaust and pressure relief device must be installed on the battery, and currently, two main ways are adopted for a safety explosion-proof device commonly used for a lithium battery: 1. the metal casing to the battery is processed one deep impression, and when the internal pressure of the battery becomes great, the impression can automatically break and release air to reduce the pressure, so that the explosion of the battery is prevented. The processing depth of the marking device is difficult to control and the force is not uniform. 2. One deck rupture membrane is added in sealed mouthful play of battery top apron, and when battery internal pressure grow, the impression can automatic rupture lose heart step-down and has prevented the battery explosion, and this kind of rupture membrane device requires highly to processing equipment, and processing technology is complicated, still can not guarantee rupture pressure, has certain potential safety hazard.

However, the two lithium battery explosion-proof devices cannot be recovered after being started, the battery can be disabled and scrapped as long as the explosion-proof device is broken carelessly, electrolyte needs to be injected into the battery in the production process of the lithium battery, the top of a battery cover plate is generally provided with a hole, and the battery is plugged after electrolyte injection is completed, so that two holes in the battery are used for injecting electrolyte, and one hole is used for installing the explosion-proof device.

Therefore, it is necessary to provide a safety valve that can satisfy both the filling and the discharging.

SUMMERY OF THE UTILITY MODEL

The utility model provides a two-way relief valve device of lithium cell, its purpose can't resume again after starting in order to solve traditional explosion-proof equipment, leads to the problem that the battery scrapped the inefficacy.

In order to achieve the above object, an embodiment of the present invention provides a two-way safety valve device for a lithium battery, including a lithium ion battery main body, a cover plate safety valve hole and a two-way safety valve;

the outer side of the two-way safety valve is provided with a valve cover, the upper side of the valve cover is provided with a circular groove, and the bottom of the groove is provided with a first lower liquid port; an inner connecting layer is sleeved in the valve cover, and external threads are arranged on the outer wall of the lower side of the inner connecting layer; a valve core is attached to the inner portion of the inner connecting layer, a groove is formed in the valve core, a thimble is arranged in the groove, a protrusion is arranged at the upper end of the thimble and arranged in the first lower liquid port, and a spring is arranged at the lower end of the thimble.

Further, a gap is formed between the protrusion and the first lower liquid port.

Further, the external thread end on the lower side of the inner connecting layer is arranged on the outer side of the valve cover.

Furthermore, a second liquid outlet is arranged between the thimble and the valve core as well as between the thimble and the valve cover.

Furthermore, a first sealing ring is arranged at the junction of the first lower liquid port and the second lower liquid port, and the first sealing ring is tightly attached to the ejector pin.

Furthermore, the bottom of the groove of the valve core is also provided with a third lower liquid opening.

Furthermore, a pressure relief opening is formed in the side wall of the valve cover, a main channel opening is formed in the inner portion of the inner connecting layer, and the main channel opening is communicated with the pressure relief opening.

Further, a second sealing ring is arranged inside the pressure relief opening.

Furthermore, a third sealing ring is arranged at the joint of the bottom of the valve cover and the external thread.

The above technical scheme of the utility model has following beneficial effect: the utility model discloses can solve present lithium cell and make and annotate liquid valve and relief valve and all be detached technical defect problem, provide a lithium cell two-way safety valve, can annotate the liquid in battery production process after installing this two-way safety valve, annotate liquid and accomplish back self-sealing, carry out the pressure release automatically when battery internal pressure is too big and exhaust, resume encapsulated situation again after battery internal pressure resumes normally.

Drawings

FIG. 1 is a view of the safety valve structure of the present invention;

FIG. 2 is a view of the structure of the safety valve hole of the cover plate of the present invention;

fig. 3 is a diagram of the structure of the device of the present invention.

Description of the reference numerals

1-a lithium ion battery body; 2-cover plate safety valve hole; 3-a two-way safety valve; 31-a first sealing ring; 32-a second seal ring; 33-a third sealing ring; 34-a valve cover; 35-external threads; 36-a valve core; 37-a thimble; 38-a spring; 41-a first lower liquid port; 42-a second lower liquid port; 43-a third lower liquid outlet; 44-main channel port; 45-pressure relief port.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The utility model provides a lithium battery two-way safety valve device, as shown in fig. 1-3, aiming at the existing problems, the lithium battery two-way safety valve device comprises a lithium ion battery main body 1, a cover plate safety valve hole 2 and a two-way safety valve 3; a valve cover 34 is arranged outside the two-way safety valve 3, a circular groove is formed in the upper side of the valve cover 34, and a first lower liquid port 41 is formed in the bottom of the groove; an inner connecting layer is sleeved in the valve cover 34, and external threads 35 are arranged on the outer wall of the lower side of the inner connecting layer; a valve core 36 is attached to the inner portion of the inner connecting layer, a groove is formed in the valve core 36, a thimble 37 is arranged in the groove, a protrusion is arranged at the upper end of the thimble 37, the protrusion is arranged in the first lower liquid port 41, and a spring 38 is arranged at the lower end of the thimble 37.

Wherein a gap is formed between the protrusion and the first lower liquid port 41; the end of the external thread 35 at the lower side of the inner connecting layer is arranged outside the valve cover 34; a second lower liquid port 42 is arranged between the thimble 37 and the valve core 36 as well as between the valve cover 34; a first sealing ring 31 is arranged at the junction of the first lower liquid port 41 and the second lower liquid port 42, and the first sealing ring 31 is tightly attached to the thimble 37.

Wherein, the bottom of the groove of the valve core 36 is also provided with a third lower liquid port 43; the side wall of the valve cover 34 is also provided with a pressure relief opening 45, a main channel opening 44 is arranged in the inner connecting layer, and the main channel opening 44 is communicated with the pressure relief opening 45; a second sealing ring 32 is arranged in the pressure relief opening 45; a third sealing ring 33 is further arranged at the joint of the bottom of the valve cover 34 and the external thread 35.

The utility model also provides a lithium cell two-way safety valve device's embodiment, concrete operation is as follows: installing the two-way safety valve 2 in a cover plate safety valve hole 2 on a lithium ion battery main body 1, and compressing a third sealing ring 33 by matching an external thread 35 with a battery cover plate to form sealing;

during liquid injection, the liquid injection equipment jacks up the thimble 37 in the two-way safety valve 3, the spring 38 compresses to open the first sealing ring 31, electrolyte flows from the first lower liquid port 41 to the second lower liquid port 41 and then to the third lower liquid port 43, then flows into the battery through the main channel port 44, and after the liquid injection is finished, the spring 38 pops open and compresses the first sealing ring 31 to form sealing;

when the battery is affected by abnormal factors such as short circuit, overdischarge, overcharge, high temperature and collision in the using process, when high-pressure gas is generated in the battery, the gas is transmitted from the inside of the battery cell to the main channel port 44 to squeeze the second sealing ring 32 open, then is discharged to a gap between the two-way safety valve 3 and the cover plate safety valve hole 2 through the pressure relief port 45 to be discharged, and when the internal pressure is normal, the second sealing ring 32 is closed to restore the sealed state of the battery;

in the embodiment, the first sealing ring, the second sealing ring and the third sealing ring are all made of ethylene propylene diene monomer peroxide rubber which is resistant to electrolyte corrosion; the two-way safety valve, the valve cover, the external threads, the valve core, the thimble and the spring are all made of 304 stainless steel which is resistant to electrolyte corrosion.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A lithium battery two-way safety valve device is characterized by comprising a lithium battery main body, a cover plate safety valve hole and a two-way safety valve;

2. The two-way safety valve assembly of claim 1, wherein there is a gap between the protrusion and the first lower port.

3. The two-way safety valve device according to claim 1, wherein an externally threaded end of the underside of the inner tie layer is provided outside the bonnet.

4. The two-way safety valve device according to claim 1, wherein a second lower liquid port is provided between the needle and the valve element and the valve cover.

5. The device of claim 4, wherein a first sealing ring is disposed at a junction of the first lower liquid port and the second lower liquid port, and the first sealing ring is tightly attached to the thimble.

6. The two-way safety valve device according to claim 1, wherein the groove bottom of the valve core is further provided with a third lower liquid port.

7. The two-way safety valve assembly according to claim 1, wherein the bonnet side wall further defines a relief port, and the internal layer defines a main passage port therein, the main passage port communicating with the relief port.

8. The two-way safety valve arrangement of claim 7, wherein a second sealing ring is provided inside the pressure relief port.

9. The two-way safety valve device according to claim 1, wherein a third sealing ring is further arranged at the joint of the bottom of the valve cover and the external thread.