CN211182403U

CN211182403U - Exhaust valve of lithium ion battery

Info

Publication number: CN211182403U
Application number: CN201921980333.XU
Authority: CN
Inventors: 赖信华; 白宗亮; 高峰
Original assignee: Chengdu Yinlong New Energy Industry Technology Research Co ltd; Yinlong New Energy Co Ltd
Current assignee: Chengdu Yinlong New Energy Industry Technology Research Co ltd; Yinlong New Energy Co Ltd
Priority date: 2019-11-16
Filing date: 2019-11-16
Publication date: 2020-08-04
Anticipated expiration: 2029-11-16

Abstract

A lithium ion battery vent valve comprises a battery cover plate arranged on a battery and an exhaust cavity penetrating through the battery cover plate, wherein a sealing ring is tightly pressed in the exhaust cavity and used for sealing the exhaust cavity; the movable pressing plate is tightly pressed with a protection plate to seal the battery. The utility model discloses install discharge valve additional on battery cell, discharge valve self-bleeding decompression when the inside atmospheric pressure of battery reaches the atmospheric pressure value that sets for and be less than explosion-proof piece explosion-proof atmospheric pressure, automatic sealing after inside atmospheric pressure reduces, used repeatedly can prevent that the battery from using the inside production of battery after the certain time gaseous, makes battery swell or explosion-proof piece break and causes condemned phenomenon, further increase of service life, reduction battery change working strength save the cost.

Description

Exhaust valve of lithium ion battery

Technical Field

The utility model belongs to battery discharge valve field especially relates to a lithium ion battery discharge valve.

Background

Present lithium ion battery is being towards the high power, high rate, low cost, high energy, high safe direction development, mainly be applied to the passenger train, the bus, the passenger train, etc. in the aspect of special type working vehicle and the energy storage, battery cell generally is leading to for installing the explosion-proof valve additional in the aspect of safety, use inside gaseous messenger's battery swell or the explosion-proof piece of producing of battery after the certain time to break, lead to the battery to miss life and directly scrap, if be in the more bus of battery quantity, when passenger train and energy storage station, because of the aforesaid scrap battery investigation that causes is comparatively difficult, the repacking work load is big.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion battery discharge valve to solve the battery and use the inside gaseous battery bulge or explosion-proof piece rupture to cause condemned technical problem of making after the certain time.

In order to achieve the above object, the utility model discloses a lithium ion battery discharge valve's concrete technical scheme as follows:

a lithium ion battery vent valve comprises a battery cover plate arranged on a battery and an exhaust cavity penetrating through the battery cover plate, wherein a sealing ring is tightly pressed in the exhaust cavity and used for sealing the exhaust cavity;

the movable pressing plate is provided with a protection plate in a pressing mode, and the battery is sealed.

The utility model discloses in, it is preferred, it is provided with the briquetting to compress tightly on the activity clamp plate, the last closing cap that compresses tightly of briquetting, it is provided with the screening glass to compress tightly on the closing cap to go up.

The utility model discloses in, it is preferred, the upper cover welding is on the battery apron, the screening glass paste in on battery apron and the upper cover.

In the present invention, preferably, at least one upper cover vent is provided on the upper cover.

In the present invention, preferably, a pair of upper cover vents is symmetrically disposed on the upper cover.

The utility model discloses in, it is preferred, upper cover laser welding is fixed on the battery apron.

The utility model discloses in, preferred, movable pressing plate includes first circle and second circle, first circle and second circle integrated into one piece, the second circle survey the lower surface with the battery apron has 0.5-0.2mm clearance.

The utility model discloses in, preferred, the edge of second circle body is provided with three evenly distributed's clamp plate gas vent, and the centre is provided with circular recess, and diameter ratio elastic pressing block diameter is 0.1-0.2mm bigger.

The utility model discloses in, preferably, the elastic pressing block material adopts fluororubber or EPT rubber, sealing washer material to adopt fluororubber.

The utility model discloses in, it is preferred, the battery apron be square battery or big cylinder battery apron.

The utility model discloses a lithium ion battery discharge valve has following advantage: the single battery is additionally provided with an exhaust valve, when the internal air pressure of the battery reaches a set air pressure value which is less than the explosion-proof air pressure of the explosion-proof sheet, the exhaust valve automatically exhausts air and reduces pressure, and the battery is automatically sealed after the internal air pressure is reduced and can be repeatedly used; the battery can be prevented from generating gas inside after the battery is used for a certain time, so that the battery bulges or the explosion-proof piece is broken to cause scrapping, the service life is prolonged, the working strength of battery replacement is reduced, and the cost is saved.

Drawings

Fig. 1 is a cross-sectional view of a vent valve structure of a lithium ion battery according to the present invention;

fig. 2 is a schematic structural view of an exhaust valve of a lithium ion battery according to the present invention;

the notation in the figure is: 1. a battery cover plate; 2. a protective sheet; 3. an upper sealing cover; 31. covering the exhaust port with an upper cover; 4. elastic pressing blocks; 5. a seal ring; 6. a movable pressing plate; 61. a first round body; 62. a second round body; 63. and (4) exhausting the air outlet of the pressure plate.

Detailed Description

In order to better understand the purpose, structure and function of the present invention, the following description is made in detail with reference to the accompanying drawings.

As shown in fig. 1-2, the utility model can prevent the battery from generating gas inside the battery after the battery is used for a certain time, so that the battery bulge or the explosion-proof sheet is broken to cause scrapping, further prolong the service life, reduce the battery replacement and the after-sale working strength, and save the cost; when the explosion-proof sheet fails and cannot be normally opened, the gas can be exhausted in time, and the safety performance of the battery is improved.

A lithium ion battery vent valve comprises a battery cover plate 1 arranged on a battery and an exhaust cavity penetrating through the battery cover plate 1, wherein a sealing ring 5 is tightly pressed in the exhaust cavity and used for sealing the exhaust cavity, a movable pressing plate 6 is tightly pressed on the sealing ring 5, and a pressing plate exhaust port 63 is arranged on the movable pressing plate 6 and used for exhausting redundant gas in the battery;

the movable pressing plate 6 is provided with a protection plate 2 in a pressing mode, and the battery is sealed.

In the present embodiment, the movable pressing plate 6 is provided with an elastic pressing block 4, the elastic pressing block 4 is provided with an upper sealing cover 3, and the upper sealing cover 3 is provided with a protection sheet 2.

In the embodiment, the upper cover 3 is welded on the battery cover plate 1, the protective sheet 2 is stuck on the battery cover plate 1 and the upper cover 3, and before the battery is assembled into a PACK or a module, electrolyte or other substances are prevented from entering the exhaust valve through the exhaust port 31 of the upper cover to form crystals and then being ineffective in the battery manufacturing process; the protective sheet 2 is removed when the battery is assembled into a PACK or module so as to be vented through the upper cover vent 31.

In the present embodiment, the upper cover 3 is provided with at least one upper cover vent 31.

In this embodiment, the upper cover 3 is symmetrically provided with a pair of upper cover vents 31, and the opposite sides are provided with the upper cover vents 31, which are channels for releasing air and pressure from the inside of the battery.

In the present embodiment, the upper lid 3 is fixed to the battery lid plate 1 by laser welding.

In this embodiment, the movable platen 6 includes a first circular body 61 and a second circular body 62, the first circular body 61 and the second circular body 62 are integrally formed, and a gap of 0.5-0.2mm is formed between the lower surface of the second circular body 62 and the battery cover plate 1.

In the present embodiment, three uniformly distributed pressure plate air outlets 63 are provided at the edge of the second round body 62 for faster air discharge; the middle of the elastic pressing block 4 is provided with a circular groove, the diameter of the elastic pressing block 4 is 0.1-0.2mm larger than the diameter of the circular groove, and the elastic pressing block 4 can be positioned at the center, so that the elastic pressing block 4 is uniformly compressed, the battery sealing is facilitated, and the exhaust degree pressure accuracy is improved.

In the present embodiment, the elastic pressing block 4 is made of fluororubber or epdm rubber, and the seal ring 5 is made of fluororubber, and sealing and degassing are realized by utilizing the compression amount of the two elastomers to change with the change of the internal pressure of the battery.

In the present embodiment, the battery cover 1 is a prismatic battery or a large cylindrical battery cover 1.

The invention relates to an exhaust valve of a lithium ion battery, which has the following specific implementation mode and exhaust process:

1. and after the sealing ring 5, the movable pressing plate 6, the elastic pressing block 4, the upper sealing cover 3 and the protection sheet 2 are sequentially arranged on the battery cover plate 1 and are tightly pressed, the sealing ring 5 and the battery cover plate 1 are fixed by laser welding.

2. When the air pressure in the battery is smaller than a set value, the compression amount of the elastic pressing block 4 and the sealing ring 5 is unchanged, the position of the movable pressing plate 6 is unchanged, and the battery is in a sealing state.

3. When the internal air pressure of the battery is greater than a set value, the internal air pressure pushes the movable pressing plate 6 to move upwards to further compress the elastic pressing block 4, meanwhile, the compression amount of the sealing ring 5 is reduced or a gap is formed between the sealing ring 5 and the movable pressing plate 6, so that the battery is not enough to be sealed, and the internal gas of the battery passes through the sealing ring 5 and the movable pressing plate 6 and is discharged from the pressing plate air outlet 63 and the upper sealing cover air outlet 31 to be decompressed.

4. When the gas in the battery is discharged and the pressure is reduced to be less than a set value, the elastic pressing block 4 rebounds, the movable pressing plate 6 is pushed downwards, and the sealing ring 5 is compressed to seal the battery again.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. A lithium ion battery vent valve comprises a battery cover plate (1) arranged on a battery and an exhaust cavity penetrating through the battery cover plate (1), and is characterized in that a sealing ring (5) is arranged in the exhaust cavity in a pressing mode and used for sealing the exhaust cavity, a movable pressing plate (6) is arranged on the sealing ring (5) in a pressing mode, and a pressing plate exhaust port (63) is formed in the movable pressing plate (6) and used for exhausting redundant gas in the battery;

the movable pressing plate (6) is provided with a protection plate (2) in a pressing mode, and the battery is sealed.

2. The exhaust valve for the lithium ion battery according to claim 1, wherein an elastic pressing block (4) is arranged on the movable pressing plate (6) in a pressing manner, an upper cover (3) is arranged on the elastic pressing block (4) in a pressing manner, and a protective plate (2) is arranged on the upper cover (3) in a pressing manner.

3. The exhaust valve for the lithium ion battery according to claim 2, wherein the upper cover (3) is welded on the battery cover plate (1), and the protective sheet (2) is adhered on the battery cover plate (1) and the upper cover (3).

4. A li-ion battery vent valve in accordance with claim 2, wherein the upper cover (3) is provided with at least one upper cover vent (31).

5. The exhaust valve for the lithium ion battery according to claim 4, wherein a pair of upper cover exhaust ports (31) are symmetrically arranged on the upper cover (3).

6. The lithium ion battery vent valve according to claim 5, characterized in that the upper cover (3) is fixed on the battery cover plate (1) by laser welding.

7. The exhaust valve for the lithium ion battery according to claim 1, wherein the movable pressure plate (6) comprises a first round body (61) and a second round body (62), the first round body (61) and the second round body (62) are integrally formed, and a gap of 0.5-0.2mm is formed between the lower surface of the second round body (62) and the cover plate (1).

8. The exhaust valve for the lithium ion battery according to claim 7, wherein the second round body (62) is provided with three uniformly distributed pressure plate exhaust ports (63) at the edge and a round groove in the middle, and the diameter of the round groove is 0.1-0.2mm larger than that of the elastic pressure block (4).

9. The exhaust valve of the lithium ion battery according to claim 1, wherein the elastic pressing block (4) is made of fluororubber or ethylene propylene diene monomer rubber, and the sealing ring (5) is made of fluororubber.

10. The exhaust valve for the lithium ion battery according to claim 1, wherein the battery cover plate (1) is a square battery or a large cylindrical battery cover plate (1).