CN211182440U

CN211182440U - Battery box thermal runaway monitoring system and battery box

Info

Publication number: CN211182440U
Application number: CN201922409218.3U
Authority: CN
Inventors: 钟海斌; 雷晶晶; 唐智; 唐涛; 王欣; 王明旺; 王华文
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2020-08-04
Anticipated expiration: 2029-12-28

Abstract

The disclosure provides a battery box thermal runaway monitoring system and a battery box. The battery box thermal runaway monitoring system comprises: the waterproof vent valve is arranged on the battery box; the monitoring switch is arranged on the waterproof vent valve and can be opened by gas sprayed out of the waterproof vent valve; the monitoring switch is electrically connected with the battery management system. The utility model provides a battery box thermal runaway monitoring system can monitor whether the battery box is inside to take place the thermal runaway phenomenon through waterproof breather valve on the battery box.

Description

Battery box thermal runaway monitoring system and battery box

Technical Field

The disclosure relates to the field of power battery manufacturing, in particular to a battery box thermal runaway monitoring system and a battery box.

Background

At present, each electric automobile enterprise continuously tries the technical conditions of high energy density and high endurance of batteries, cascades a large number of batteries, and the batteries after the cascading form a large battery box. In the conventional technology, as one of means for improving the safety of the battery box, a waterproof vent valve (also called a PUW pressure release valve) is arranged on the box, so that when the pressure in the battery box reaches the blowout value of the waterproof vent valve, the pressure can be released through the waterproof vent valve, but the waterproof vent valve only has a pressure release function and does not have a thermal runaway monitoring function.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a battery box thermal runaway monitoring system and battery box, battery box thermal runaway monitoring system can monitor whether the battery box is inside to have the thermal runaway phenomenon to take place.

In order to achieve the above object, a first aspect of the present disclosure provides a battery box thermal runaway monitoring system, including:

the waterproof vent valve is arranged on the battery box; and the number of the first and second groups,

the monitoring switch is arranged on the waterproof vent valve and can be opened by gas sprayed out of the waterproof vent valve; the monitoring switch is electrically connected with the battery management system.

Optionally, the monitoring switch includes a housing, a base, a pin, and a control button, the housing is disposed on the base, the pin and the control button pass through the housing, the control button includes an insulating portion and a conductive portion that are connected to each other, the conductive portion is disposed under the insulating portion, and the conductive portion is electrically connected to the pin.

Optionally, the housing is integrally formed with the base.

Optionally, the number of the pins is two, a pin through hole is formed in the housing, and one end of each pin penetrates through the pin through hole and is connected with the battery management system.

Optionally, the other end of the pin is provided with an elastic member, and the elastic member is electrically connected with the conductive part.

Optionally, the base is provided with an air guide hole and an air guide device, one end of the air guide device is connected with the air guide hole in a sealing manner, and the other end of the air guide device is close to the conductive part.

Optionally, an exhaust hole is arranged on the housing, and the position of the exhaust hole is higher than that of the pin.

Optionally, the control button is an elastic button disposed on a top surface of the housing at a position corresponding to the elastic member.

Optionally, the monitor switch is made of a high temperature resistant material.

The second aspect of the present disclosure provides a battery box, which includes the battery box thermal runaway monitoring system provided by the first aspect of the present disclosure.

Through above-mentioned technical scheme, this battery box thermal runaway monitoring system that this disclosure provided sets up the monitoring switch on waterproof breather valve, and this monitoring switch can take place to feed back battery management system in time when bursting at waterproof breather valve to whether the monitoring battery incasement portion takes place the thermal runaway phenomenon, has improved the security of battery box.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic diagram of an operating principle of a thermal runaway detection system of a battery box according to an embodiment.

Fig. 2 is a schematic structural diagram of a monitoring switch according to an embodiment.

Fig. 3 is a schematic diagram of the monitoring switch in fig. 2 in the X direction.

FIG. 4 is a cross-sectional view of the monitor switch of FIG. 3 taken along line L-L'.

Description of the reference numerals

1 monitor switch 2 casing

3 base 31 air guide hole

32 air guide 4 pins

41 elastic member 5 control button

51 insulating part 52 conductive part

6 waterproof ventilation valve of pin through-hole 7

8 battery box 9 battery management system

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "upper, lower, left, right" generally refers to "above," "below," "left," "right" of a particular feature in a drawing without a contrary intention. "inner and outer" refer to the "inner" and "outer" sides of the particular component illustrated in the drawings. "distal and proximal" refer to the distance from a particular element in the drawings.

A first aspect of the present disclosure provides a battery box thermal runaway monitoring system, referring to fig. 1 to 4, including: the waterproof vent valve 7 arranged on the battery box 8 can rapidly discharge the gas in the battery box 8 when the internal air pressure of the battery box 8 is suddenly increased. Monitoring switch 1, monitoring switch 1 set up 7 on waterproof breather valve, are connected with battery management system 9 electricity, can be opened by spun gas in waterproof breather valve 7, and battery management system 9 monitors and sends the warning that there is the thermal runaway phenomenon in the battery box after monitoring switch 1 opens.

The monitoring switch 1 comprises a housing 2, a base 3, a pin 4 and a control button 5. The shell 2 is arranged on the base 3 and protects components arranged on the base 3, and the shell 2 and the base 3 are integrally formed to prevent the shell 2 from being flushed away by gas sprayed out of the waterproof ventilation valve 7. The base 3 is mutually matched with the waterproof vent valve 7 and is fixed on the waterproof vent valve 7, and can be fixed by bonding, welding or bolting, so that the monitoring switch 1 is ensured not to be flushed by gas sprayed out of the waterproof vent valve 7.

Two pin through holes 6 are arranged on the shell 2, each pin through hole 6 corresponds to one pin 4, one end of each pin 4 penetrates through the corresponding pin through hole 6 to be connected with a battery management system, and the other end of each pin 4 is provided with an elastic component 41. The pin 4 is arranged at the upper half part inside the monitoring switch 1, and provides a setting space for other components. The control button 5 includes an insulating portion 51 and a conductive portion 52, the conductive portion 52 is disposed below the insulating portion 51, and the two pins 4 are electrically connected to each other through the conductive portion 52. The conductive portion 52 is provided with a groove for engaging with the elastic member 41, so that the conductive portion 52 and the elastic member 41 are not easily disconnected after being connected.

The housing 2 is provided with an exhaust hole, and the position of the exhaust hole is higher than that of the pin 4, so that the gas in the waterproof exhaust valve is ensured to be exhausted from the exhaust hole after rushing through the conductive part 52. Be provided with control button 5 on shell 2, control button 5 is the elasticity button, and set up in and two pins 4 between the corresponding position department, specifically, control button 5 sets up the top in the position between two pins 4. The control button 5 can be pressed again to connect the conductive part 52 and the lead 4 after the conductive part 52 is disconnected from the lead 4.

The base 3 is provided with an air guide hole 31 and an air guide device 32, the air guide hole 31 is arranged in the center of the air guide device 32, air sprayed from the waterproof air-permeable valve is guided into the monitoring switch 1, the air guide device 32 is arranged above the air guide hole 31, one end of the air guide device 32 is hermetically connected with the air guide hole 31, the other end of the air guide device 32 is close to the conductive part 52, the air guide device 32 can collect the air guided in the air guide hole 31 and concentrate the air guided to the position of the conductive part 52, the impact force of the air on the conductive part 52 is enhanced, and the control button 5 can be ensured to be disconnected from the pins 4 under the action of the.

The working principle of the monitoring switch 1 will be further explained below:

when thermal runaway phenomenon occurs in the battery box, the air pressure in the box body is rapidly increased, the air is sprayed out from the waterproof exhaust valve and enters the monitoring switch 1, and the air is collected to the conducting part 52 by the air guide device 32 in the monitoring switch 1 and impacts the conducting part 52. At this time, since the internal air pressure of the battery case is high, the impact force is large, and the conductive portion 52 can be quickly opened, so that the electrical connection between the conductive portion 52 and the lead 4 can be broken. Because pin 4 is connected with battery management system, battery management system can judge that waterproof snuffle valve takes place to explode and spouts, and then judges that there is the thermal runaway phenomenon in the battery box to take place. When the conductive part 52 is disconnected from the pins 4, the conductive part 52 can be reset by the control button 5: when the control button 5 is pressed, the conductive part 52 is inserted between the two pins 4 and fixed by the elastic member 41, thereby resetting the conductive part 52.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A battery box thermal runaway monitoring system, comprising:

2. The battery box thermal runaway monitoring system of claim 1, wherein the monitoring switch comprises a housing, a base, a pin, and a control button, the housing is disposed on the base, the pin and the control button respectively pass through the housing, the control button comprises an insulating portion and a conductive portion connected, the conductive portion is disposed below the insulating portion, and the conductive portion is electrically connected with the pin.

3. The battery box thermal runaway monitoring system of claim 2, wherein the housing is integrally formed with the base.

4. The battery box thermal runaway monitoring system of claim 2, wherein the number of the pins is two, the housing is provided with a pin through hole, and one end of each pin penetrates through the pin through hole and is connected with the battery management system.

5. The battery box thermal runaway monitoring system of claim 4, wherein the other end of the pin is provided with an elastic member, and the elastic member is electrically connected with the conductive portion.

6. The battery box thermal runaway monitoring system of claim 5, wherein the control button is a resilient button disposed on the top surface of the housing at a location corresponding to the resilient member.

7. The battery box thermal runaway monitoring system of claim 2, wherein the base is provided with an air guide hole and an air guide device, one end of the air guide device is hermetically connected with the air guide hole, and the other end of the air guide device is close to the conductive part.

8. The battery box thermal runaway monitoring system of claim 2, wherein an exhaust vent is provided on the housing, the exhaust vent being located at a higher position than the pin.

9. The battery box thermal runaway monitoring system of claim 1, wherein the monitor switch is made of a high temperature resistant material.

10. A battery box characterized by comprising the battery box thermal runaway monitoring system according to any one of claims 1 to 9.