CN219416695U

CN219416695U - Detection device for detecting opening of battery safety valve through air pressure change and battery

Info

Publication number: CN219416695U
Application number: CN202320218371.1U
Authority: CN
Inventors: 王浩; 郑益; 朱利安; 夏晨强
Original assignee: Hangzhou Gold Electronic Equipment Co Ltd
Current assignee: Hangzhou Gold Electronic Equipment Co Ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-07-25
Anticipated expiration: 2033-01-13

Abstract

The utility model relates to the field of battery information detection, in particular to a detection device for detecting the opening of a battery safety valve through air pressure change and a battery. According to the utility model, the sealed detection space is formed at the outer side of the first safety valve, and the pressure sensor is used for detecting the pressure of the detection space to judge whether the first safety valve is opened, so that the information of the safety valve is accurately and timely obtained, and the monitoring of whether the safety valve is opened is realized.

Description

Detection device for detecting opening of battery safety valve through air pressure change and battery

Technical Field

The utility model relates to the field of battery information detection, in particular to a detection device for detecting the opening of a battery safety valve through air pressure change and a battery.

Background

The rapid development of new energy industry makes electrochemical cells such as lithium ion batteries, sodium ion batteries, lead-acid batteries and the like widely applied. And a large number of batteries are required to be connected in parallel and/or in series to form a high-voltage battery pack in the environments of electric automobiles, energy storage power stations and the like. Safety problems caused by various reasons such as design process and abuse of the battery, and the huge number of batteries, make the safety problems of the battery increasingly prominent. During the use of the battery, the battery is improperly operated or has other reasons, so that safety problems, such as serious overcharge, are caused, the internal temperature and pressure of the battery are continuously increased, and the battery can explode when the internal temperature and pressure exceeds the safety threshold of the battery; other problems such as battery short-circuiting, severe overtemperature, thermal runaway, impact or crush deformation, and puncture may also cause explosion of the battery.

The battery safety valve is the last explosion-proof barrier of the battery, and when the internal pressure of the battery reaches the valve opening threshold value of the safety valve (for example, the valve opening threshold value of certain lithium ion battery safety valves is 600-800 KPa), the battery safety valve is flushed for air leakage and pressure reduction to avoid explosion. At this time, the gas inside the battery is discharged to the outside in a large amount, and the electrolyte inside the battery is also sprayed out along with the release of the pressure. Although the safety valve is opened to avoid explosion, the chemical substances in the battery, which leak along with the gas, are likely to fire after chemical reaction with oxygen in the air under high temperature conditions. Meanwhile, the safety of the peripheral batteries is affected by the problem battery, the problem battery needs to be timely warned for intervention, subsequent replacement and the like, and otherwise, the overall safe operation of the system is seriously affected.

In the prior art, in order to ensure safe and effective operation of the battery, the state of the battery is mainly detected and managed through a battery management module. The current battery management module mainly detects the voltage, temperature, charge and discharge current of the battery, performs insulation monitoring on the system and the like, and the current battery management module does not monitor the battery safety valve because the safety valve does not have a physical quantity capable of being monitored, and a small amount of data are disclosed to be monitored by means of valve opening sound signals, air pressure signals and the like.

Disclosure of Invention

To solve the above problems, a first object of the present utility model is to provide a detecting device for detecting the opening of a battery safety valve by air pressure change, which accurately and timely detects whether the safety valve is opened.

For the first purpose of the utility model, the following technical scheme is adopted for implementation:

the utility model provides a detect detection device that battery relief valve opened through atmospheric pressure change, includes the fixed relief valve apron that sets up in the first relief valve outside, forms sealed detection space between relief valve apron and the first relief valve, and pressure sensor's detection end stretches into in the detection space, detects the pressure of detection space.

Preferably, the safety valve cover plate is provided with a second safety valve, and when the pressure in the detection space is greater than the valve opening threshold of the second safety valve, the second safety valve is opened to break the tightness of the detection space.

Preferably, the valve opening threshold of the second relief valve is greater than the valve opening threshold of the first relief valve.

Preferably, the valve opening threshold of the second safety valve is 0.5-10 KPa greater than the valve opening threshold of the first safety valve.

Preferably, the valve opening threshold of the second relief valve is smaller than the valve opening threshold of the first relief valve.

Preferably, the valve opening threshold of the second safety valve is 10kpa to 200kpa smaller than the valve opening threshold of the first safety valve.

Preferably, the pressure in the detection space is normally higher or lower than the outside atmospheric pressure.

Preferably, the safety valve cover plate is provided with a connecting port penetrating through the inner side and the outer side, and the second safety valve is arranged on the outer side of the connecting port to seal the connecting port.

The second object of the utility model is to provide a battery, which comprises a shell and a battery cover plate arranged on the shell, wherein the battery cover plate is provided with a mounting opening, a first safety valve is arranged on the inner side close to the mounting opening, and the detection device is arranged on the outer side close to the mounting opening.

In summary, the beneficial effects of the utility model are as follows: the sealed detection space is formed at the outer side of the first safety valve, and the pressure sensor is used for detecting the pressure of the detection space to judge whether the first safety valve is opened, so that the information of the safety valve is accurately and timely obtained, and the monitoring of whether the safety valve is opened is realized.

Drawings

Fig. 1 is a top view of a battery.

Fig. 2 is a cross-sectional view at A-A in fig. 1.

Fig. 3 is a partial enlarged view at B in fig. 2.

Detailed Description

As shown in fig. 2, the battery includes a case 1 and a battery cover 2 provided at an upper opening of the case 1, the battery cover 2 having a mounting port 21 penetrating through upper and lower surfaces and communicating the inside of the case 1 with the outside atmosphere, a first safety valve 3 being provided on the mounting port 21, and the first safety valve 3 completely covering the mounting port 21 such that the mounting port 21 can be completely closed when the first safety valve 3 is closed, thereby isolating the inside of the battery from the outside. The shell 1 is internally provided with necessary substances of batteries such as an electric core, electrolyte and the like.

When the battery is in a normal state, the air pressure in the shell 1 only changes in a small range and is not higher than the valve opening threshold value of the first safety valve 3, so that the first safety valve 3 is always in a closed state; when the battery is in an abnormal state, the air pressure in the shell 1 is continuously increased, and when the air pressure in the shell 1 is higher than the valve opening threshold value of the first safety valve 3 (for example, the valve opening threshold value of some lithium batteries is 600-800 KPa), the first safety valve 3 is opened, so that the air in the shell can be discharged outwards, the pressure in the shell 1 is released, and the shell 1 is prevented from deforming or even exploding.

During the use of the battery, the operation is improper or some other reasons, so that safety problems occur, such as continuous rise of the internal temperature and pressure of the battery in the case of severe overcharge; other problems such as battery shorting, severe overtemperature, thermal runaway, impact or compression deformation, and puncture may also cause internal pressure problems; when the safety valve threshold is exceeded, the safety valve opens. Once the battery safety valve is opened, an alarm should be given in time and related processing should be performed, such as maintenance personnel replacing the failed battery in time.

The application provides a whether open the detection device who detects to the relief valve, the device mainly sets up a inclosed detection space 5 in the outside of first relief valve 3 to set up pressure sensor 6 in detection space 5, the change of the pressure numerical value that detects through pressure sensor 6 judges whether first relief valve 3 opens.

As shown in fig. 2 and 3, the first safety valve 3 is provided near the inside of the mounting port 21, specifically, in the present embodiment, the edge of the outer periphery of the first safety valve 3 is attached to the inner surface of the battery cover plate 2 such that the first safety valve 3 is inside the mounting port 21. The safety valve cover plate 4 is fixedly arranged on the outer side close to the mounting opening 21, namely, the safety valve cover plate 4 is positioned on the outer side of the first safety valve 3, and the appearance of the safety valve cover plate 4 is slightly larger than that of the mounting opening 21, so that the safety valve cover plate 4 can completely cover the mounting opening 21, and a closed detection space 5 is formed between the safety valve cover plate 4 and the first safety valve 3. The detection end 61 of the pressure sensor 6 extends into the detection space 5 to obtain corresponding pressure information.

When the battery is in a normal state, the pressure of the detection space 5 is hardly changed, and thus the pressure value detected by the pressure sensor 6 is also hardly changed. When the battery is in an abnormal state, the internal pressure of the casing 1 is continuously increased and finally the first safety valve 3 is opened, so that the gas in the casing 1 enters the detection space 5, and the pressure of the detection space 5 is instantaneously increased, so that the value of the pressure sensor 6 is increased, and it can be judged that the first safety valve 3 is opened.

As shown in fig. 3, note that after the first safety valve 3 is opened, gas will gather in the detection space 5, so that the pressure in the detection space 5 increases instantaneously, in order to avoid the damage of the battery structure caused by high pressure, the safety valve cover 4 is further provided with a connection port, and a pressure release component is provided on the connection port, where the pressure release component is a structure that is at least partially broken and/or torn by the high pressure, in this embodiment, the pressure release component is the second safety valve 7, and the valve opening threshold of the second safety valve 7 is slightly greater than or less than the valve opening threshold of the first safety valve 3, for example, the valve opening threshold of the second safety valve 7 is about 1KPa or less than the valve opening threshold of the first safety valve 3 by about 100KPa, and the reason of this numerical range is to ensure that the pressure in the detection space 5 can be discharged out quickly after being stored for a relatively short time, that is released as soon as possible.

After the second relief valve 7 is provided, only when the pressure in the detection space 5 is higher than the valve opening threshold of the second relief valve 7, the second relief valve 7 is opened, thereby deteriorating the tightness of the detection space 5, the gas in the detection space 5 is discharged to the outside, eventually causing the pressure inside the detection space 5 and the housing 1 to be the local atmospheric pressure, and the value of the pressure sensor 6 eventually becomes the value of the local atmospheric pressure.

By providing the inner and outer safety valves, the air pressure change of the detection space 5 becomes relatively more obvious after the first safety valve 3 is opened. This is because the air pressure in the detection space 5 rises to the valve opening threshold value of the second safety valve 7, and then drops rapidly, and finally reaches the atmospheric pressure. The pressure sensor 6 has a relatively long time to feel the pressure change from an observational point of view, avoiding that the pressure sensor 6 cannot accurately obtain the pressure value of the change process due to the momentary change of pressure.

As a further improvement, in the normal state of the battery, the pressure of the detection space 5 is preferably not consistent with the local atmospheric pressure, so that on one hand, whether the first safety valve 3 is opened or not can be detected, and on the other hand, whether the detection space 5 is opened from the outside or not can be detected, for example, if the safety valve cover plate 4 or the second safety valve 7 is damaged by the outside, and the sealing performance is lost, the atmospheric pressure of the detection space 5 will be equal to the local atmospheric pressure, and the value of the pressure sensor 6 will be slowly changed into the local atmospheric pressure, so that the leakage of the detection space 5 is indicated.

In this embodiment, the pressure of the detection space 5 is smaller than the local atmospheric pressure, for example, 200pa to 2000pa smaller than the local atmospheric pressure, when the first safety valve 3 is opened, the pressure of the detection space 5 is instantaneously increased, so that the detection space 5 is changed from a relatively negative pressure (meaning that the local atmospheric pressure is negative) to a relatively positive pressure (meaning that the local atmospheric pressure is positive), and the pressure continues to be increased until the valve opening threshold of the second safety valve 7 is reached, and the second safety valve 7 is also opened accordingly. In the whole process, the pressure change of the pressure sensor 6 is changed from the original relative negative pressure to the relative positive pressure, and when the pressure reaches a peak value, the pressure is quickly reduced until the external environment pressure is reached, and the pressure is stabilized at a relative positive pressure value. By such a procedure, it can be more accurately judged that the first safety valve 3 of the battery is opened.

As a specific implementation of the detection space 5 with respect to the negative pressure: the safety valve cover plate 4 and the second safety valve 7 are assembled on the cover plate 2 under the environment of relative negative pressure (200 pa-2000 pa relative to the local atmospheric pressure), and the detection space 5 formed after assembly can be kept to be a sealed space of the relative negative pressure 200 pa-2000 pa by a laser welding mode.

Although in the present embodiment, the pressure of the detection space 5 is a relatively negative pressure, in other embodiments, the pressure of the detection space 5 may be slightly greater than the local atmospheric pressure, so that it is also possible to accurately determine whether the first safety valve 3 is opened.

In fig. 3, the upper end of the pressure sensor 6 is fixedly provided on the relief valve cover plate 4 such that the pressure sensor 6 is suspended upside down in the detection space 5, and two terminals of the pressure sensor 6 are exposed on the top surface of the relief valve cover plate 4 so as to facilitate wiring of the pressure sensor 6. As an example of the fixing means, the pressure sensor 6 may be sealed and fixed by laser welding or sealant. It should be noted that, in other embodiments, the pressure sensor 6 may be fixedly disposed in the mounting port 21 of the battery cover 2, and even the pressure sensor 6 may be disposed in the detection space 5 without being connected to the battery cover 2 or the safety valve cover 4.

The first safety valve 3 can be welded to the bottom of the battery cover plate 2 by means of laser welding, and the second safety valve 7 can also be welded to the safety valve cover plate 4 by means of laser welding.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a detect detection device that battery relief valve opened through atmospheric pressure change, its characterized in that, including fixed relief valve apron (4) that set up in the outside of first relief valve (3), form sealed detection space (5) between relief valve apron (4) and first relief valve (3), in detection space (5) are stretched into to detection end (61) of pressure sensor (6), detect the pressure of detection space (5).

2. The detection device for detecting the opening of the battery safety valve through the air pressure change according to claim 1, wherein the safety valve cover plate (4) is provided with a second safety valve (7), and when the pressure of the detection space (5) is larger than the valve opening threshold value of the second safety valve (7), the second safety valve (7) is opened, and the tightness of the detection space (5) is broken.

3. The detection device for detecting the opening of the battery safety valve by the change of the air pressure according to claim 2, wherein the valve opening threshold of the second safety valve (7) is larger than the valve opening threshold of the first safety valve (3).

4. The detection device for detecting the opening of the battery safety valve through the air pressure change according to claim 3, wherein the valve opening threshold of the second safety valve (7) is 0.5-10 kpa larger than the valve opening threshold of the first safety valve (3).

5. The detection device for detecting the opening of the battery safety valve by the change of the air pressure according to claim 2, wherein the valve opening threshold of the second safety valve (7) is smaller than the valve opening threshold of the first safety valve (3).

6. The detection device for detecting the opening of the battery safety valve through the air pressure change according to claim 5, wherein the valve opening threshold of the second safety valve (7) is 10kpa to 200kpa smaller than the valve opening threshold of the first safety valve (3).

7. The detecting device for detecting the opening of a battery safety valve by air pressure change according to any one of claims 1 to 6, wherein the pressure of the detecting space (5) is higher or lower than the external atmospheric pressure in a normal state.

8. The device for detecting the opening of the battery safety valve through the air pressure change according to claim 2, wherein the safety valve cover plate (4) is provided with a connecting port penetrating through the inner side and the outer side, and the second safety valve (7) is arranged on the outer side of the connecting port to seal the connecting port.

9. The utility model provides a battery, its characterized in that includes casing (1) and sets up battery apron (2) on casing (1), is provided with mounting hole (21) on battery apron (2), is provided with first relief valve (3) near the inboard of mounting hole (21), is provided with the detection device of any one of claims 1~8 near the outside of mounting hole (21).