CN211907477U

CN211907477U - Battery and battery module

Info

Publication number: CN211907477U
Application number: CN202020417225.8U
Authority: CN
Inventors: 何巍; 李开波; 黄利明; 舒宽金; 刘金成; 袁中直
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2020-11-10
Anticipated expiration: 2030-03-27

Abstract

The utility model relates to a battery, including battery body and explosion-proof device, the battery body includes the casing, has the first chamber that holds the core package in the casing, is provided with the opening that supplies the core package installation on the casing, and the opening passes through the apron shutoff, and the casing has the lateral wall that is the contained angle setting with the apron, and explosion-proof device sets up on the lateral wall, and explosion-proof device includes explosion-proof construction and holds the piece, holds the piece and is provided with the second and holds the chamber, and explosion-proof construction is located the second and holds the intracavity, and explosion-proof construction can block or communicate first chamber and the second of holding and hold the chamber. The utility model discloses a set up explosion-proof construction and hold the piece, make the first pressure release that can in time hold the chamber superpressure to with electrolyte discharge hold the piece, have the characteristics of safe and reliable and environmental protection.

Description

Battery and battery module

Technical Field

The utility model relates to a battery technology field especially relates to a battery and contain battery module of this battery.

Background

The safety performance of the battery directly affects the use safety of users, and in order to prevent explosion accidents caused by the expansion of the internal electrolyte in the charging and discharging processes of the battery, an explosion-proof structure is designed on a battery shell to solve the problem. In the prior art, the explosion-proof structure is arranged on the battery cover plate, and when the valve is opened, electrolyte inside the battery leaks out along the explosion-proof structure. The power battery usually uses a plurality of batteries in parallel or in series, so the electrolyte leaked from the explosion-proof structure indirectly affects the normal use of other batteries around through the connecting piece on the battery cover plate, and is easy to cause secondary accidents. In addition, the leaked electrolyte flows over along with gaps between the batteries, and pollutes surrounding parts.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery and battery module can accomodate electrolyte when the pressure release, has higher security and feature of environmental protection.

To achieve the purpose, the utility model adopts the following technical proposal:

the battery comprises a battery body and an explosion-proof device, wherein the battery body comprises a shell, a first accommodating cavity for accommodating a core bag is formed in the shell, the shell is provided with a supply for installing the core bag, the opening is blocked by an cover plate, the shell is provided with a side wall which is arranged by an included angle with the cover plate, the explosion-proof device is arranged on the side wall, the explosion-proof device comprises an explosion-proof structure and an accommodating piece, the accommodating piece is provided with a second accommodating cavity, the explosion-proof structure is located in the second accommodating cavity, the explosion-proof structure can be blocked or communicated with the first accommodating cavity and the second accommodating cavity.

Further, the second accommodating cavity is a vacuum cavity.

Furthermore, the accommodating part is made of elastic materials, and the accommodating part can be elastically deformed along with the pressure change of the second accommodating cavity.

Further, the periphery of the accommodating piece is provided with a folding part, and the folding part can be stretched and deformed along with the pressure change of the second accommodating cavity.

Furthermore, explosion-proof construction includes the body, the body is equipped with the cushion chamber, be provided with first through-hole and second through-hole on the chamber wall of cushion chamber, first through-hole is used for the intercommunication the cushion chamber with first chamber that holds, first through-hole is close to the one end of cushion chamber is provided with the shrouding, the shrouding alternative block and the intercommunication first through-hole, the cushion chamber with the second holds the chamber and passes through the second through-hole intercommunication.

Further, a sectional area S2 of the second through hole/a sectional area S1 of the first through hole is > 1.

Furthermore, the second through holes are distributed at intervals along the periphery of the body.

Furthermore, a spring is further arranged on the inner wall of the buffer cavity, and the spring is connected with one side face, far away from the first through hole, of the sealing plate.

Furthermore, a third through hole is formed in the side wall of the shell, the third through hole is respectively communicated with the first accommodating cavity and the second accommodating cavity, the explosion-proof structure comprises an explosion-proof plate arranged on one side, close to the second accommodating cavity, of the third through hole, the explosion-proof plate is connected with the shell, the explosion-proof plate blocks the third through hole, and when the pressure in the first accommodating cavity exceeds a set value, the explosion-proof plate is separated from the shell;

or the explosion-proof structure is an explosion-proof notch carved on the side wall of the shell, and when the pressure in the first accommodating cavity exceeds a set value, the explosion-proof notch is broken.

Furthermore, a concave part is arranged on the outer wall of the shell and used for accommodating the explosion-proof device.

Still provide a battery module, include the battery, the battery is a plurality of, a plurality of the battery electricity is connected.

The utility model discloses compare in prior art's beneficial effect:

the utility model discloses a battery through setting up explosion-proof construction and holding, makes the first pressure release that can in time hold when holding the inside superpressure of chamber to with the inside electrolyte of casing arrange into and hold the piece, avoid electrolyte to cause the influence to other parts of being connected on with this casing, and avoid causing the pollution to the environment on every side, have higher security and feature of environmental protection.

The utility model discloses a battery module, including this battery, have higher security and feature of environmental protection.

Drawings

Fig. 1 is a sectional view of a battery of an embodiment.

Fig. 2 is a sectional view of a battery of another embodiment.

Fig. 3 is a sectional view of a battery according to still another embodiment.

Fig. 4 is a sectional view of the explosion-proof structure of the embodiment.

In the figure:

1. an explosion-proof structure; 10. a body; 11. a buffer chamber; 12. a first through hole; 13. a second through hole; 14. closing the plate; 15. an explosion-proof plate; 16. a spring; 2. a receiving member; 20. a folding part; 21. a second accommodating chamber; 3. a housing; 30. a recessed portion; 31. a third through hole; 4. and (7) a cover plate.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

As shown in fig. 1 to 4, the utility model provides a pair of battery, including battery body and explosion-proof device, battery body includes casing 3, the first chamber that holds the core package has in the casing 3, be provided with the opening that supplies the core package installation on the casing 3, the opening passes through the shutoff of apron 4, casing 3 has the lateral wall that is the contained angle setting with apron 4, explosion-proof device sets up on the lateral wall, explosion-proof device includes explosion-proof structure 1 and holds 2, it is provided with the second and holds chamber 21 to hold 2, explosion-proof structure 1 is located the second and holds chamber 21, explosion-proof structure 1 can block or communicate first chamber and the second of holding and hold chamber 21. It can be understood that the first accommodating cavity is internally provided with a core bag, and the core bag is electrically connected with a pole arranged on the cover plate 4. The cover plate 4 is also provided with a connecting sheet and an insulating sealing element. The first containing cavity is filled with electrolyte. When the battery is in use and subjected to a large electrical load or thermal load, the electrolyte decomposes to generate gas, so that the internal pressure of the first accommodation chamber rises. In order to avoid explosion of the housing 3 caused by continuous rise of the internal pressure, a pressure relief treatment is required. During the pressure release, the mixed material such as gas, electrolyte in the first chamber of holding will discharge to holding 2 through explosion-proof structure 1. In this embodiment, referring to fig. 1, a core package is disposed in a casing 3, and a cover plate 4 is disposed on the top of the casing 3. The lateral wall of casing 3 is provided with explosion-proof structure 1, and the apron 4 is kept away from to the aim at of explosion-proof structure 1 setting on the lateral wall, causes the influence to other connecting pieces on the apron 4 when avoiding the pressure release. Explosion-proof structure 1 holds chamber 21 intercommunication with first chamber and the second of holding respectively, and explosion-proof structure 1 is in the normally closed state, and when the first internal pressure who holds the chamber exceeded the setting value, explosion-proof structure 1 opened the valve to make the first electrolyte that holds the intracavity get into and hold piece 2, reach the purpose of pressure release. Meanwhile, the electrolyte is collected by the accommodating part 2, and is prevented from being discharged into the surrounding space to pollute other electrical elements and the surrounding environment. This embodiment is through setting up explosion-proof construction 1 and holding piece 2, but in time the pressure release when making the superpressure in the first holding chamber to discharge into holding piece 2 with the electrolyte in the first holding chamber, have safe and reliable and the characteristics of environmental protection.

Specifically, the second accommodation chamber 21 is a vacuum chamber. It can be understood that, the second accommodating cavity 21 is set as a vacuum cavity, so that the inner walls of the second accommodating cavity 21 can be attached together, and the volume of the accommodating part 2 is reduced, thereby improving the space utilization rate of the battery. In this embodiment, the open end of the accommodating member 2 is connected to the side wall of the housing 3, and the explosion-proof structure 1 is located in the open end, so that the second accommodating chamber 21 communicates with the explosion-proof structure 1. After the receiving member 2 is mounted, the receiving member 2 is vacuumized so that the receiving member 2 is attached to the outer wall of the housing 3. Of course, a low-viscosity glue layer can be further arranged, and the inner wall of the accommodating piece 2 is attached to the outer wall of the shell 3 through the glue layer, so that the attachment is smooth, and the outer surface of the battery is neat and attractive.

In one embodiment, the accommodating element 2 is made of an elastic material, and the accommodating element 2 can deform along with the pressure change of the second accommodating cavity 21. It can be understood that, the containing part 2 is made of elastic material, the volume of the containing part 2 before the valve is opened is small, and the containing part 2 is expanded after the valve is opened, so that the volume of the containing part 2 in a normal state can be further reduced, and the space is saved.

In another embodiment, referring to fig. 1 and 2, the peripheral portion of the accommodating member 2 is provided with a folded portion 20, and the folded portion 20 can be stretched and deformed with the pressure change of the second accommodating chamber 21. It can be understood that the volume of the container 2 at normal state can be reduced by folding the peripheral portion of the container 2, and the folded portion 20 is expanded under pressure to contain the electrolyte discharged from the case 3 when the pressure is released. By providing the folding portion 20, the space can be saved, and the overall space utilization of the battery can be improved.

Specifically, explosion-proof construction 1 includes body 10, and body 10 is equipped with cushion chamber 11, is provided with first through-hole 12 and second through-hole 13 on the chamber wall of cushion chamber 11, and first through-hole 12 is used for communicateing cushion chamber 11 and the first chamber that holds, and first through-hole 12 is close to the one end of cushion chamber 11 and is provided with shrouding 14, and shrouding 14 optional blocks and communicates first through-hole 12, and cushion chamber 11 holds the chamber 21 with the second and passes through second through-hole 13 intercommunication. Preferably, the sectional area S2 of the second through hole 13/the sectional area S1 of the first through hole 12 is more than 1. It can be understood that, in a normal state, the sealing plate 14 blocks the first through hole 12, and when the pressure in the first accommodating chamber exceeds a set value, the internal pressure pushes the sealing plate 14 away to communicate the first through hole 12, and the electrolyte enters the second accommodating chamber 21 through the first through hole 12, the buffer chamber 11 and the second through hole 13 in sequence. In this embodiment, the sectional area S2 of the second through hole 13/the sectional area S1 of the first through hole 12 is greater than 1, so as to reduce the speed of the electrolyte entering the accommodating member 2, preferably, S2/S1 is 4 to 10, and the buffer chamber 11 is arranged to release partial pressure after the electrolyte enters the buffer chamber 11, so as to reduce the impact force on the accommodating member 2.

Specifically, the second through holes 13 are plural, and the plural second through holes 13 are distributed at intervals along the peripheral portion of the body 10. The plurality of second through holes 13 are arranged, so that the total cross-sectional size of the channel is increased, the pressure of the electrolyte is released, the impact force on the accommodating piece 2 is reduced, and the accommodating piece 2 is prevented from being broken due to too large impact force when being expanded.

Specifically, a spring 16 is further disposed on the inner wall of the buffer cavity 11, and the spring 16 is connected to a side surface of the closing plate 14 away from the first through hole 12. The spring 16 is used to provide pressure to the closing plate 14 towards the first through hole 12, so that the first through hole 12 is in a normally closed state.

Preferably, the spring 16 is a coil spring. The compression ratio of the spring 16 is 40-50%, the pre-pressing amount is 10-20%, and the pre-pressing pressure F1/set pressure F2 is 0.9-1. Wherein, the pre-pressing pressure F1 is a pre-pressing force generated when the spring 16 is compressed, and is used for pressing the closing plate 14; the set pressure F2 is the minimum pressure against the sealing plate 14, and the set pressure F2 is the maximum cell design internal pressure P × the area S of the first through hole 12. The pre-pressing pressure F1 is not more than the set pressure F2 in the embodiment, so that the safety of the battery is ensured.

In another embodiment, referring to fig. 3, a third through hole 31 is formed in a side wall of the housing 3, the third through hole 31 is respectively communicated with the first accommodating chamber and the second accommodating chamber 21, the explosion-proof structure 1 includes an explosion-proof plate 15 disposed on a side of the third through hole 31 close to the second accommodating chamber 21, the explosion-proof plate 15 is connected with the housing 3, the explosion-proof plate 15 blocks the third through hole 31, and when the pressure in the first accommodating chamber exceeds a set value, the explosion-proof plate 15 is separated from the housing 3; or, the explosion-proof structure 1 is an explosion-proof notch engraved on the side wall of the housing 3, and when the pressure in the first accommodating cavity exceeds a set value, the explosion-proof notch is broken. In this embodiment, the third through hole 31 is directly formed in the housing 3 to form a pressure relief channel, so that the manufacturing process is simpler. The connection form of the explosion-proof plate 15 and the housing 3 includes, but is not limited to, bonding or welding. When the pressure applied to the explosion-proof plate 15 exceeds a set value, the bonding part or the welding part is broken, the third through hole 31 is communicated, and pressure relief is realized. Or, set up explosion-proof nick in the lateral wall of casing 3 is close to one side of first holding the chamber, and explosion-proof nick is confined geometry, and when first holding intracavity pressure exceeded the setting value, the compressive strength of explosion-proof nick department was less than other positions and tears from explosion-proof nick department, forms pressure release channel. Of course, in other embodiments, the vent score may have a non-sealing geometry that ruptures when the pressure in the first receiving chamber exceeds a predetermined value.

Specifically, a recess 30 is provided on the outer wall of the case 3 of the battery, and the recess 30 is used to accommodate an explosion-proof device. Referring to fig. 1 to 3, the accommodating part 2 is subjected to vacuum treatment in a normal state, the accommodating part 2 is attached to the outer wall of the housing 3, and the parts of the accommodating part 2 and the explosion-proof structure 1 protruding out of the outer wall of the housing 3 are accommodated in the recessed part 30, so that the outer wall of the housing 3 is flat and attractive, and meanwhile, the accommodating part 2 is prevented from being damaged due to friction with an external object. Preferably, the depth H1 of the recess 30 and the wall thickness H2 of the housing 3 are 1/5 to 1/10.

Specifically, the explosion-proof device further comprises an alarm which is electrically connected with the explosion-proof structure 1. The alarm is provided with the pilot lamp, when explosion-proof structure 1 opened the valve pressure release, starts the alarm and indicates through instructing etc. to overhaul the processing.

The remarkable effects of the embodiment are as follows: through setting up explosion-proof construction 1 and holding piece 2, but in time the pressure release when making the superpressure in the first holding chamber to discharge into holding piece 2 with electrolyte, have safe and reliable and the characteristics of environmental protection.

The utility model also provides a pair of battery module, including foretell battery, the battery is a plurality of, and a plurality of battery electricity are connected. The number of the batteries and the connection mode are correspondingly set according to indexes such as capability output, voltage, current and the like of the product.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a battery, its characterized in that, includes battery body and explosion-proof device, battery body includes the casing, the first chamber that holds core package has in the casing, be provided with the confession on the casing the opening of core package installation, the opening passes through the apron shutoff, the casing have with the apron is the lateral wall that the contained angle set up, explosion-proof device sets up on the lateral wall, explosion-proof device includes explosion-proof construction and holds the piece, it is provided with the second and holds the chamber to hold the piece, explosion-proof construction is located the second holds the intracavity, explosion-proof construction can block or communicate first hold the chamber with the second holds the chamber.

2. The battery of claim 1, wherein the second receiving cavity is a vacuum cavity.

3. The battery of claim 2, wherein the receiving member is made of an elastic material, and the receiving member is elastically deformable according to a pressure change of the second receiving chamber.

4. The battery according to claim 2, wherein the peripheral portion of the receiving member is provided with a folded portion that is elastically deformable in accordance with a change in pressure of the second receiving chamber.

5. The battery according to claim 1, wherein the explosion-proof structure comprises a body, the body is provided with a buffer cavity, a first through hole and a second through hole are arranged on the cavity wall of the buffer cavity, the first through hole is used for communicating the buffer cavity with the first accommodating cavity, a sealing plate is arranged at one end, close to the buffer cavity, of the first through hole, the sealing plate can selectively block and communicate with the first through hole, and the buffer cavity is communicated with the second accommodating cavity through the second through hole.

6. The battery according to claim 5, wherein a sectional area S2 of the second through hole/a sectional area S1 of the first through hole is > 1.

7. The battery of claim 5, wherein the second through holes are a plurality of, and the plurality of second through holes are spaced along a periphery of the body.

8. The battery of claim 5, wherein the buffer cavity further comprises a spring disposed on an inner wall thereof, and the spring is connected to a side of the sealing plate away from the first through hole.

9. The battery according to claim 1, wherein a third through hole is formed in a side wall of the case, the third through hole is respectively communicated with the first accommodating cavity and the second accommodating cavity, the explosion-proof structure comprises an explosion-proof plate arranged on one side of the third through hole close to the second accommodating cavity, the explosion-proof plate is connected with the case, the explosion-proof plate blocks the third through hole, and when the pressure in the first accommodating cavity exceeds a set value, the explosion-proof plate is separated from the case;

10. The battery of claim 1, wherein a recess is provided in an outer wall of the housing for receiving the explosion-proof device.

11. A battery module comprising the battery according to any one of claims 1 to 10, wherein the battery is a plurality of batteries, and the plurality of batteries are electrically connected.