CN215578939U

CN215578939U - Battery pack with pressure relief structure

Info

Publication number: CN215578939U
Application number: CN202120911210.1U
Authority: CN
Inventors: 廖子木; 夏循钊
Original assignee: Chongqing Jinkang Power New Energy Co Ltd
Current assignee: Chongqing Jinkang Power New Energy Co Ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2022-01-18
Anticipated expiration: 2031-04-29

Abstract

The application belongs to the technical field of battery packs, and particularly relates to a battery pack with a pressure relief structure, which comprises a box body and a cover body for packaging a battery cell, and a fastener for connecting the cover body and the box body; the connecting part of the cover body and the box body comprises a fastening area for keeping connection and a pressure relief area for exhausting air outwards; the fastener forms a weak connection structure in the pressure relief area, and the weak connection structure enables the tightness of the pressure relief area to be lower than that of the fastening area. The battery package of this scheme not only can avoid trompil on box and/or lid with the pressure release structural design at the position of being connected of box and lid, avoids revealing the risk. And can save explosion-proof relief valve spare part, practice thrift battery system cost. In addition, the battery package of this embodiment can design great pressure release region according to the demand, very big improvement the pressure release rate, can further improve the security of battery package.

Description

Battery pack with pressure relief structure

Technical Field

The application relates to the technical field of battery packs, in particular to a battery pack with a pressure relief structure.

Background

All install explosion-proof valve on traditional battery package, when the thermal runaway appeared in the battery package, atmospheric pressure in the battery package can rise fast, utilizes explosion-proof valve can avoid the battery package to explode with the high-pressure gas release in the battery package.

However, installing the burst valve requires a hole in the battery pack, which increases the risk of leakage and weakens the structural strength of the cover and/or the case. Also, the explosion-proof valve is costly, which increases manufacturing costs.

Therefore, it is highly desirable to develop a battery pack with low leakage risk and low cost.

Disclosure of Invention

To above-mentioned problem, this application provides a battery package with pressure release structure, through with the connection position of pressure release structure design at box and lid, can effectively reduce revealing the risk of battery package, and low in production cost.

The scheme of the application is as follows:

the battery pack with the pressure relief structure comprises a box body and a cover body which are used for packaging the battery core, and a fastener for connecting the cover body and the box body;

the connecting part of the cover body and the box body comprises a fastening area for keeping connection and a pressure relief area for exhausting air outwards;

the fastener forms a weak connection structure in the pressure relief area, and the weak connection structure enables the tightness of the pressure relief area to be lower than that of the fastening area.

Preferably, the fastener comprises a first bolt arranged on the fastening area and a second bolt arranged on the pressure relief area; the distance between the first bolts is smaller than the distance between the second bolts.

Preferably, the fastening piece comprises a third bolt and a pressing strip arranged corresponding to the fastening area, and the third bolt sequentially penetrates through the pressing strip and the cover body to fix the cover body on the box body.

Preferably, the distribution distance of the third bolts in the fastening area is smaller than the distribution distance of the third bolts in the pressure relief area.

Preferably, a groove is formed in a portion of the inner side of the box body, which is opposite to the pressure relief area.

Preferably, a portion of the cover body corresponding to the relief area and a portion of the cover body corresponding to the fastening area are made of materials having different structural strengths, and the structural strength of the portion of the cover body corresponding to the fastening area is higher than the structural strength of the portion of the cover body corresponding to the fastening area.

Preferably, a sealing gasket is arranged between the cover body and the box body.

Preferably, the box body comprises a bottom plate and a side wall for forming a side wall; the edge of the cover body is provided with a flanging, and the flanging of the cover body is connected with the top of the side wall.

Preferably, the groove is arranged at the top of the side wall.

Preferably, the cuff comprises a fastening section relative to the fastening area and a weakened area relative to the pressure relief section; the structural strength of the fastening section is higher than the structural strength of the weak section.

The battery package of this scheme not only can avoid trompil on box and/or lid with the pressure release structural design at the position of being connected of box and lid, avoids revealing the risk. And can save explosion-proof relief valve spare part, practice thrift the cost of battery package. In addition, the battery pack of this scheme can design great pressure release region according to the demand, very big improvement the pressure release rate, further improved the security of battery pack.

Drawings

FIG. 1 is a schematic structural diagram of a case and a cover;

FIG. 2 is a schematic diagram of a pressure relief structure according to the first embodiment;

FIG. 3 is a schematic view of the structure at the groove;

FIG. 4 is a schematic structural view of a flange;

fig. 5 is a schematic view of a pressure relief structure in the second embodiment.

In the figure, a box body 1, a side wall 11, a groove 111, a cover body 2, a flanging 21, a fastening section 211, a weak section 212, a first bolt 31, a second bolt 32, a third bolt 33, a pressing strip 4, a sealing gasket 5 and a pressure relief area 6.

Detailed Description

The following is further detailed by the specific embodiments:

example one

As shown in fig. 1 and 2, the present embodiment provides a battery pack including a case 1 and a cover 2 for enclosing a battery cell, and a fastener for connecting the case 1 and the cover 2. The cover body 2 is fastened on the box body 1, so that the box body 1 and the cover body 2 form a closed space.

In this embodiment, the box body 1 includes a bottom plate and side walls 11 forming side walls, and the top of the box body 1 forms an opening. The edge of the cover 2 has a horizontal flange 21. The fastening piece connects the flange 21 of the cover body 2 with the top of the side wall 11 of the box body 1, and the part of the flange 21 connected with the side wall 11 is the connecting part of the box body 1 and the cover body 2. The connection site comprises a fastening area for holding the connection and a pressure relief area 6 for venting to the outside.

In the battery pack in the embodiment, the pressure relief structure is designed at the connecting part of the box body 1 and the cover body 2, so that holes can be prevented from being formed in the box body 1 and/or the cover body 2, the leakage risk is avoided, and the processing cost is reduced. And can save explosion-proof relief valve spare part, practice thrift the cost of battery package. In addition, the battery pack of this embodiment can design great pressure release area according to the demand, very big improvement the pressure release rate, further improved the security of battery pack.

In the present embodiment, the fastener includes a first bolt 31 and a second bolt 32. The first bolt 31 and the second bolt 32 pass through the flange 21 of the lid 2 and are fixed to the side wall 11 of the case 1. The first bolts 31 are distributed in the fastening area, the second bolts 32 are distributed in the pressure relief area 6, and the distance between the first bolts 31 is smaller than the distance between the second bolts 32. This embodiment makes the fastener form weak connection structure in the part of pressure release area 6 through the mode of the interval that increases second bolt 32 to reduce box 1 and lid 2 at pressure release area 6's joint strength, thereby weaken pressure release area 6's leakproofness, simple structure, the design cost is low. When the air pressure in the battery pack is large, the high-pressure air in the battery pack can be discharged from the pressure relief area 6. It should be noted that although the distance between the second bolts 32 on the pressure relief area 6 is large, the pressure relief area 6 can satisfy the sealing requirement of the battery pack in the normal operating state.

As shown in fig. 3, in the present embodiment, a groove 111 is formed in a portion of the inside of the case 1 corresponding to the pressure relief region 6. The groove 111 of the present embodiment is formed in the top of the side wall 11 of the case 1, and the groove 111 flares the pressure relief region 6 at the connection portion toward the inside of the battery pack. The design of the groove 111 can further weaken the sealing performance of the pressure relief area 6, and when the air pressure in the battery pack is too high, high-pressure air in the battery pack firstly passes through the groove 111 and then passes through the pressure relief area 6 to be released outwards.

In this embodiment, the gasket 5 is provided between the top of the side wall 11 and the flange 21, and the gasket 5 can enhance the sealing performance of the connecting portion between the box body 1 and the lid body 2.

As shown in fig. 4, in the present embodiment, the flange 21 of the lid body 2 includes a fastening section 211 corresponding to the fastening region and a weak section 212 corresponding to the pressure relief region 6, the fastening section 211 and the weak section 212 are made of materials having different structural strengths, the fastening section 211 has a high structural strength, and the weak section 212 has a low structural strength. When the internal air pressure of the battery pack is too high, the high-temperature gas in the battery pack can more easily deform the weak section 212 of the cover body 2, so that the high-pressure gas in the battery pack is ensured to be released outwards from the pressure release area 6. The weak section 212 in this embodiment is matched with the groove 111 on the side wall 11, and the groove 111 can guide high-pressure gas to act on the weak section 212 of the flange 21, which is beneficial to deformation of the weak section 212 of the flange 21.

Example two

As shown in fig. 5, in the present embodiment, the fastening members are the third bolts 33 for connecting the case body 1 and the cover body 2 and the beads 4 for pressing the case body 1 and the cover body 2. The pressing strip 4 in this embodiment is arranged above the flanging 21 and corresponds to the fastening area. It should be noted that, because the pressing strip 4 is only arranged corresponding to the fastening region, the part of the pressing strip 4 corresponding to the fastening region is a continuous strip, and the part corresponding to the pressure relief region 6 is not provided with the pressing strip 4. In this embodiment, by omitting the pressure relief strip 4 from the pressure relief area 6, a weak connection structure is formed at the portion of the pressure relief area 6 by the fastener, and a weak connection structure is formed at the portion of the pressure relief area 6 by the fastener, so that the connection strength of the box body 1 and the cover body 2 at the pressure relief area 6 is reduced, the sealing performance of the pressure relief area 6 is lower than that of the fastening area, and the air pressure in the battery pack can be discharged from the pressure relief area 6.

In the present exemplary embodiment, the third screws 33 are distributed uniformly, i.e. the distance between the fastening region and the third screws 33 of the pressure relief region 6 is the same.

In some embodiments, the third bolt 33 may also refer to the arrangement of the first bolt 31 and the second bolt 32 in the first embodiment. Namely, the fastening area is provided with the pressing strips 4, and the distance between the third bolts 33 in the fastening area is small; the pressure relief area 6 is free of the cloth strip 4, and the space between the third bolts 33 in the pressure relief area 6 is large.

The battery pack in this embodiment further includes the gasket 5 and the groove 111 mentioned in the first embodiment. In the present embodiment, the flange 21 of the lid body 2 also includes a fastening section 211 and a weak section 212, that is, the flange 21 of the lid body 2 has high structural strength relative to the fastening region, and the flange 21 of the lid body 2 has low structural strength relative to the relief region 6.

The case 1 and the cover 2 in the present application include, but are not limited to, the upper and lower fastening structures described in the present embodiment, and the container formed by two or more separate bodies for packaging the battery cells is also included in the scope of the case 1 and the cover 2 in the present application.

The application is not limited solely to the description and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the application is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. The battery pack with the pressure relief structure comprises a box body and a cover body which are used for packaging the battery core, and a fastener for connecting the cover body and the box body;

it is characterized in that the preparation method is characterized in that,

2. The battery pack with the pressure relief structure according to claim 1, wherein: the fastener comprises a first bolt arranged on the fastening area and a second bolt arranged on the pressure relief area; the distance between the first bolts is smaller than the distance between the second bolts.

3. The battery pack with the pressure relief structure according to claim 1, wherein: the fastening piece comprises a third bolt and a pressing strip arranged corresponding to the fastening area, and the third bolt sequentially penetrates through the pressing strip and the cover body to fix the cover body on the box body.

4. The battery pack with the pressure relief structure according to claim 3, wherein: the distribution interval of the third bolts in the fastening area is smaller than that of the third bolts in the pressure relief area.

5. The battery pack with the pressure relief structure according to any one of claims 2 to 4, wherein: and a groove is arranged on the inner side of the box body relative to the part of the pressure relief area.

6. The battery pack with the pressure relief structure according to claim 5, wherein: the cover body is made of a material having a different structural strength from a portion of the cover body corresponding to the relief area and a portion of the cover body corresponding to the fastening area, and the structural strength of the portion of the cover body corresponding to the fastening area is higher than the structural strength of the portion of the cover body corresponding to the fastening area.

7. The battery pack with the pressure relief structure according to claim 6, wherein: and a sealing gasket is arranged between the cover body and the box body.

8. The battery pack with the pressure relief structure according to claim 7, wherein: the box body comprises a bottom plate and a side wall for forming a side wall; the edge of the cover body is provided with a flanging, and the flanging of the cover body is connected with the top of the side wall.

9. The battery pack with the pressure relief structure according to claim 8, wherein: the groove is arranged at the top of the side wall.

10. The battery pack having a pressure relief structure according to claim 9, wherein the flange includes a fastening section with respect to the fastening region and a weak section with respect to the pressure relief region; the structural strength of the fastening section is higher than the structural strength of the weak section.