WO2022227673A1

WO2022227673A1 - Power battery thermal runaway monitoring apparatus and method, and power battery system

Info

Publication number: WO2022227673A1
Application number: PCT/CN2021/143102
Authority: WO
Inventors: 马腾翔; 荣常如; 刘轶鑫; 许立超; 孙承锐
Original assignee: 中国第一汽车股份有限公司
Priority date: 2021-04-28
Filing date: 2021-12-30
Publication date: 2022-11-03
Also published as: CN113119737A; CN113119737B

Abstract

Provided are a power battery thermal runaway monitoring apparatus and method, and a power battery system. The power battery thermal runaway monitoring apparatus comprises a monitoring parameter collection module (110), a monitoring parameter transmission module (120), a thermal runaway determination module (130) and a safety control execution module (140), wherein the monitoring parameter collection module (110) is configured to collect power battery thermal runaway monitoring parameters of a vehicle in multiple operation scenarios; the monitoring parameter transmission module (120) is configured to acquire the power battery thermal runaway monitoring parameters that are collected by the monitoring parameter collection module (110), and to transmit the power battery thermal runaway monitoring parameters to the thermal runaway determination module (130); the thermal runaway determination module (130) is configured to determine whether the thermal runaway monitoring parameters satisfy a thermal runaway condition, and to monitor whether the monitoring parameter transmission module (120) satisfies a failure condition; and the safety control execution module (140) is configured to determine, according to a result that is output by the thermal runaway determination module (130), whether to execute a safety mechanism for degradation, warning and disconnection of a high-voltage loop.

Description

Power battery thermal runaway monitoring device, method and power battery system

This application claims the priority of a Chinese patent application with application number 202110470532.1 filed with the China Patent Office on April 28, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of electric vehicles, for example, to a power battery thermal runaway monitoring device, method, and power battery system.

Background technique

The power battery safety industry has become the bottom line for the development of new energy vehicles. Domestic and foreign vehicle companies, battery companies and other parts companies have improved the safety of battery systems from multiple perspectives and throughout the life cycle through chemical safety, mechanical safety, electrical safety and functional safety design. , to avoid thermal runaway of the power battery.

The power battery thermal runaway monitoring method determines whether the power battery is thermally runaway by monitoring the battery voltage, temperature, current and pressure in real time. However, when the battery is injected and ignited, the acquisition sensor and communication transmission link will be damaged, so that the thermal runaway of the power battery cannot be detected at the first time.

SUMMARY OF THE INVENTION

The present application provides a power battery thermal runaway monitoring device, method and power battery system, which can effectively detect the power battery thermal runaway and improve the safety of the power battery system.

A power battery thermal runaway monitoring device is provided, the device includes a monitoring parameter acquisition module, a monitoring parameter transmission module, a thermal runaway judgment module and a safety control execution module; the monitoring parameter transmission module is respectively connected with the monitoring parameter acquisition module and the thermal runaway module. The judging module is connected, and the thermal runaway judging module is connected with the safety control execution module; the monitoring parameter collection module is configured to collect the power battery thermal runaway monitoring parameters of the vehicle in multiple operation scenarios; the monitoring parameter transmission module, is configured to acquire the power battery thermal runaway monitoring parameters collected by the monitoring parameter acquisition module, and transmit the power battery thermal runaway monitoring parameters to the thermal runaway judgment module; the thermal runaway judgment module is configured to judge the power battery Whether the battery thermal runaway monitoring parameter satisfies the thermal runaway condition and monitoring whether the monitoring parameter transmission module satisfies the failure condition; the safety control execution module is configured to determine whether to execute the safety mechanism according to the result output by the thermal runaway judgment module.

Also provided is a power battery thermal runaway monitoring method, including:

Obtain the thermal runaway monitoring parameters of the power battery;

Determine the judgment result according to whether the thermal runaway monitoring parameter of the power battery meets the thermal runaway condition;

Determine the monitoring result according to the monitoring communication line and whether the communication line meets the failure condition;

Based on the judgment result and the monitoring result, it is determined whether thermal runaway occurs in the power battery.

A power battery system is also provided, the system includes a power battery and a power battery thermal runaway monitoring device, and the power battery thermal runaway monitoring device is inside the power battery;

A protection device is installed outside the monitoring parameter acquisition module and the monitoring parameter transmission module in the power battery thermal runaway monitoring device. Describe the damage of the monitoring parameter acquisition module and the monitoring parameter transmission module.

Description of drawings

1 is a schematic structural diagram of a power battery thermal runaway monitoring device provided in Embodiment 1 of the present application;

2 is a schematic structural diagram of a power battery thermal runaway monitoring device provided in Embodiment 2 of the present application;

3 is a schematic flowchart of a method for monitoring thermal runaway of a power battery provided in Embodiment 3 of the present application;

FIG. 4 is an exemplary flowchart of a method for monitoring thermal runaway of a power battery provided in Embodiment 3 of the present application;

FIG. 5 is a schematic structural diagram of a power battery system according to Embodiment 4 of the present application.

Detailed ways

Embodiments of the present application will be described below with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, the present application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. The drawings and embodiments of the present application are only used for exemplary purposes, and are not intended to limit the protection scope of the present application.

The multiple steps described in the method embodiments of the present application may be performed in different orders and/or in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of this application is not limited in this regard.

As used herein, the term "including" and variations thereof are open-ended inclusions, ie, "including but not limited to". The term "based on" is "based at least in part on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below.

Concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units relation.

Modifications of "a" and "a plurality" mentioned in this application are illustrative rather than restrictive, and should be understood as "one or more" unless the context indicates otherwise.

The names of messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes, and are not used to limit the scope of these messages or information.

Example 1

1 is a schematic structural diagram of a power battery thermal runaway monitoring device provided in Embodiment 1 of the present application. The device is suitable for judging whether thermal runaway occurs in a power battery. The device can be implemented by software and/or hardware. And integrated in the power battery.

As shown in FIG. 1 , a power battery thermal runaway monitoring device provided in Embodiment 1 of the present application includes a monitoring parameter acquisition module 110, a monitoring parameter transmission module 120, a thermal runaway judgment module 130 and a safety control execution module 140; the monitoring parameter transmission module 120 is respectively connected with the monitoring parameter collection module 110 and the thermal runaway judgment module 130, and the thermal runaway judgment module 130 is connected with the safety control execution module 140; the monitoring parameter collection module 110 is set to collect the power battery thermal runaway monitoring parameters of the vehicle in multiple operating scenarios The monitoring parameter transmission module 120 is configured to obtain the power battery thermal runaway monitoring parameters collected by the monitoring parameter acquisition module 110, and transmit the power battery thermal runaway monitoring parameters to the thermal runaway judgment module 130; the thermal runaway judgment module 130 is set to judge the The power battery thermal runaway monitoring parameter satisfies the thermal runaway condition, and monitors whether the monitoring parameter transmission module 120 satisfies the failure condition; the safety control execution module 140 is configured to determine whether to execute the safety mechanism according to the result output by the thermal runaway judgment module 130 .

The multi-operation scenarios may include multiple scenarios of vehicle stationary, vehicle running, and vehicle charging. The thermal runaway parameters of the power battery may include the cell voltage, total current, battery temperature, and internal pressure value of the power battery in the power battery.

In this embodiment, the monitoring parameter transmission module 120 is respectively connected with the monitoring parameter collection module 110 and the thermal runaway judgment module 130, and sends the power battery thermal runaway monitoring parameters collected by the monitoring parameter collection module 110 to the thermal runaway judgment module 130, So that the thermal runaway judgment module 130 judges the thermal runaway monitoring parameters of the power battery.

In this embodiment, after obtaining the thermal runaway monitoring parameters of the power battery, the thermal runaway judging module 130 can judge whether the thermal runaway monitoring parameters meet the preset trigger conditions and monitor whether the monitoring parameter transmission module 120 meets the failure conditions.

The thermal runaway condition can be understood as a series of preset conditions, and the thermal runaway condition can be set according to the actual situation. Exemplarily, the thermal runaway condition can include that the battery temperature exceeds the normal temperature and the duration of exceeding the normal temperature exceeds the preset time. , and the duration of the cell voltage invalid value exceeds the preset time or there is a cell voltage sampling failure. The above-mentioned normal temperature and normal voltage are obtained by establishing the thermal runaway model of the power battery to obtain the thermal runaway value of the power battery under different operating scenarios of the vehicle, and the normal value can be determined through calculation.

Wherein, the failure condition may be that the circuit inside the monitoring parameter transmission module 120 is damaged or broken, and the signal cannot be transmitted and the effective thermal runaway monitoring parameter cannot be transmitted. The thermal runaway monitoring parameter has an invalid value.

In this embodiment, the safety control execution module 140 can obtain the result output by the thermal runaway judging module 130 by connecting with the thermal runaway judging module 130, and judge whether to trigger the safety mechanism according to the result. After the safety mechanism is triggered, de-escalation, warning and disconnection of the high-voltage circuit can be performed to protect the power battery.

The first embodiment of the present application provides a power battery thermal runaway monitoring device. The device collects the power battery thermal runaway monitoring parameters of the vehicle in multiple operating scenarios through a monitoring parameter collection module, and obtains the monitoring parameter collection through a monitoring parameter transmission module. The power battery thermal runaway monitoring parameters collected by the module and the power battery thermal runaway monitoring parameters are transmitted to the thermal runaway judgment module; the thermal runaway judgment module is used to judge whether the power battery thermal runaway monitoring parameters meet the thermal runaway conditions and monitor all the thermal runaway monitoring parameters. whether the monitoring parameter transmission module satisfies the failure condition; the safety control execution module determines whether to execute the safety mechanism according to the result output by the thermal runaway judgment module. The above device can effectively detect the thermal runaway of the power battery and improve the safety of the power battery system.

Embodiment 2

2 is a schematic structural diagram of a power battery thermal runaway monitoring device provided in the second embodiment of the present application. The power battery thermal runaway monitoring device provided in the second embodiment of the present application is described on the basis of the first embodiment. For the content that has not been described in detail in this embodiment, please refer to Embodiment 1.

As shown in FIG. 2 , the power battery thermal runaway monitoring device includes: a monitoring parameter acquisition module 210 , a monitoring parameter transmission module 220 , a thermal runaway judgment module 230 and a safety control execution module 240 .

In this embodiment, the monitoring parameter collection module 210 includes a sampling chip 211, a current sensor 212, a pressure sensor 213, and an input/output (I/O) interface 214; the sampling chip 211 may be set to collect data in the power battery Cell voltage and battery temperature; the current sensor 212 can be set to collect the total current of the power battery; the pressure sensor 213 is set to collect the pressure value of the power battery, and the I/O interface 214 is set to send and receive monitoring communication signals.

In this embodiment, the monitoring parameter transmission module 220 includes two intertwined communication lines 221 and monitoring communication lines 222; the communication line 221 is a ring-shaped communication line connecting the monitoring parameter acquisition module 210 and the thermal runaway judgment module 230, and is set to transmit The power battery thermal runaway monitoring parameters obtained from the monitoring parameter acquisition module 210 are sent to the thermal runaway judgment module 230; the monitoring communication line 222 is a one-way communication line connecting the monitoring parameter acquisition module 210 and the thermal runaway judgment module 230, and is set to monitor the monitoring Communication status between the parameter collection module 210 and the thermal runaway judgment module 230 .

Wherein, the communication line 221 is a ring-shaped communication line. When one side of the communication line of the communication line 221 is broken, the other side of the communication line can be used for parameter transmission. The monitoring communication line 222 is a one-way communication line, and the monitoring communication line 222 is only configured to send a monitoring communication signal to the thermal runaway judgment module 230. If the thermal runaway judgment module 230 can receive the monitoring communication signal, it is determined that the monitoring communication line 222 is not broken.

The failure condition of the monitoring parameter transmission module 220 is that the communication line 221 and the monitoring communication line 222 fail at the same time; wherein, the failure of the communication line 221 is that the thermal runaway monitoring parameter of the power battery received by the thermal runaway judgment module 230 contains invalid values, and the monitoring communication line 222 fails. This is because the thermal runaway judgment module 230 does not receive the monitoring communication signal sent by the monitoring communication line 222 .

In this embodiment, if the thermal runaway monitoring parameter transmitted by the communication line 221 to the thermal runaway judging module 230 contains an invalid value, the communication line 221 is determined to be invalid, and if the monitoring communication line 222 cannot send a monitoring communication signal, it is determined that the monitoring communication line 222 invalid.

Optionally, whether to perform a fault alarm may also be determined according to whether the communication line 221 and the monitoring communication line 222 are disconnected.

If the thermal runaway judging module 230 cannot receive the monitoring communication signal, it can be determined that the monitoring communication line 222 is in a disconnected state, and it can be determined that there is no disconnection in the communication line 221, it can be determined that only the monitoring communication line 222 is faulty, and then A fault alarm message that monitors the communication line 222 may be generated. If at least one disconnection of the communication line 221 is detected, it can be monitored whether the thermal runaway judgment module 230 receives the monitoring communication signal; if the thermal runaway judgment module 230 receives the monitoring communication signal sent by the monitoring communication line 222, it can be determined that the monitoring If the communication line 222 is in the connected state, it can be determined that only the communication line 221 is faulty, and then the fault alarm information of the communication line 221 can be generated.

In the method for monitoring thermal runaway of a power battery provided by the second embodiment of the present application, it is possible to determine whether thermal runaway occurs in a power battery through a communication line and a monitoring communication line. In addition, it can also effectively judge whether the communication line and the monitoring communication line are faulty and generate fault alarm information, so that the staff can monitor the power battery in an all-round way.

Embodiment 3

3 is a schematic flowchart of a method for monitoring thermal runaway of a power battery provided in Embodiment 3 of the present application. The method can be applied to determine whether thermal runaway occurs in a power battery. The method can be executed by a power battery thermal runaway monitoring device. Wherein the device can be realized by software and/or hardware and integrated in the power battery.

As shown in FIG. 3 , a method for monitoring thermal runaway of a power battery provided in Embodiment 3 of the present application includes the following steps.

S310 , obtaining the thermal runaway monitoring parameters of the power battery.

In this embodiment, the thermal runaway monitoring parameters of the power battery can be acquired from the monitoring parameter collection module. The thermal runaway parameters of the power battery may include the temperature of the power battery, the voltage of the power battery cell, the total current of the power battery, and the pressure value inside the power battery.

Among them, the temperature of the power battery and the voltage of the power battery cell can be collected by the sampling chip in the monitoring parameter collection module, the total current of the power battery can be collected by the current sensor in the monitoring parameter collection module, and the pressure value inside the power battery can be collected by the pressure sensor. .

S320. Determine a judgment result according to whether the power battery thermal runaway monitoring parameter satisfies the thermal runaway condition.

Among them, if the thermal runaway monitoring parameters meet the thermal runaway conditions, the judgment result is that the power battery has thermal runaway; if the thermal runaway monitoring parameters do not meet the thermal runaway conditions, the judgment result is that the power battery does not have thermal runaway.

Exemplarily, when the battery temperature exceeds the normal temperature and the duration of exceeding the normal temperature exceeds the preset time, and the duration of the cell voltage invalid value exceeds the preset time or there is a cell voltage sampling fault, it is determined that the thermal runaway monitoring parameters satisfy the thermal runaway. condition. When all the parameters in the thermal runaway monitoring parameters reach normal values, it is determined that the thermal runaway monitoring parameters do not satisfy the thermal runaway condition.

S330. Determine the monitoring result according to the monitoring communication line and whether the communication line meets the failure condition.

Among them, if both the monitoring communication line and the communication line meet the failure condition, the monitoring result is determined to be the thermal runaway of the power battery; if only one of the monitoring communication line and the communication line meets the failure condition, the monitoring result is determined that the power battery does not have thermal runaway. .

S340. Determine whether the power battery has thermal runaway according to the judgment result and the monitoring result.

The determining whether the power battery has thermal runaway according to the judgment result and the monitoring result includes: if the judgment result is that the thermal runaway monitoring parameter of the power battery reaches a preset trigger condition, determining that the power battery has thermal runaway; If the monitoring result is that the communication line and the monitoring communication line meet the failure condition, it is determined that the power battery has thermal runaway.

In this embodiment, if any one of the judgment result and the monitoring result is that the power battery is thermally out of control, it is determined that the power battery is thermally out of control.

It is also possible to determine whether to perform a fault alarm according to whether the communication line and the monitoring communication line are disconnected; wherein, determining whether to perform a failure alarm according to whether the communication line and the monitoring communication line are disconnected includes: determining the monitoring communication line. After being in the disconnected state, if the communication line is in a normal state, a fault alarm message for monitoring the communication line is generated; the normal state is that there is no disconnection in the communication line; it is determined that there is at least one disconnection in the communication line Then, according to the monitoring communication signal of the monitoring communication line, it is determined that the monitoring communication line is in a connected state, and then the fault alarm information of the communication line is generated.

If the thermal runaway judging module cannot receive the monitoring communication signal, it can be determined that the monitoring communication line is in a disconnected state. Communication line failure alarm information. If at least one disconnection of the communication line is detected, it can be monitored whether the thermal runaway judgment module receives the monitoring communication signal. If the thermal runaway judgment module receives the monitoring communication signal sent by the monitoring communication line, it can be determined that the monitoring communication line is connected. status, it can be determined that only the communication line is faulty, and then the fault alarm information of the communication line can be generated.

After determining whether thermal runaway occurs in the power battery according to the judgment result and the monitoring result, the method further includes: judging the hazard probability and risk factor according to the thermal runaway monitoring result and determining whether to execute safety control; the safety mechanism may include degrading , limit power, disconnect the high-voltage contactor, perform instrument prompts and buzzer alarms.

Among them, if the thermal runaway monitoring result is that the power battery has thermal runaway, the safety mechanism can be implemented.

Exemplarily, if the thermal runaway monitoring parameter is close to the pre-set thermal runaway threshold but does not reach the threshold, de-escalation and power limiting operations can be performed; if the thermal runaway monitoring parameter reaches the pre-set thermal runaway threshold, disconnection can be performed. High voltage contactor, instrument prompt and buzzer alarm operation.

The third embodiment of the present application provides a method for monitoring thermal runaway of a power battery, which obtains monitoring parameters for thermal runaway of a power battery; determines a judgment result according to whether the monitoring parameters for thermal runaway of the power battery meet the thermal runaway condition; monitors communication lines and whether the communication lines The monitoring result is determined when the failure condition is satisfied; whether thermal runaway occurs in the power battery is determined based on the judgment result and the monitoring result.

Based on the above embodiments, embodiments of the above embodiments are provided, and FIG. 4 is an exemplary flowchart of a method for monitoring thermal runaway of a power battery provided in Embodiment 3 of the present application. In this embodiment, the hard wire is the monitoring communication wire, and the daisy chain is the communication wire. As shown in FIG. 4 , the method includes:

Receive thermal runaway monitoring parameters and hard-wired signals, determine whether the thermal runaway monitoring parameters reach the set threshold, that is, determine whether the thermal runaway monitoring parameters meet the thermal runaway conditions, and if so, determine that the power battery has thermal runaway and trigger a safety mechanism;

If the thermal runaway monitoring parameters do not reach the set threshold, the daisy chain is disconnected, the hard wire is disconnected, and the thermal runaway monitoring parameters that can be transmitted by the daisy chain are valid, the daisy chain disconnection fault and the hard wire disconnection fault will be reported;

If the thermal runaway monitoring parameters do not reach the set threshold, the daisy chain is disconnected, the hard wire is disconnected, and the thermal runaway monitoring parameters transmitted by the daisy chain contain invalid values, it is determined that the power battery is thermally runaway and the safety mechanism is triggered;

If the thermal runaway monitoring parameter does not reach the set threshold, the daisy chain is disconnected and the hard wire is not disconnected, the daisy chain disconnection fault will be reported;

If the thermal runaway monitoring parameter does not reach the set threshold, the daisy chain is not disconnected and the hard wire is disconnected, the hard wire disconnection fault will be reported;

If the thermal runaway monitoring parameters do not reach the set threshold, the daisy chain is not disconnected, and the hard wire is not disconnected, the power battery is determined to be safe.

Embodiment 4

FIG. 5 is a schematic structural diagram of a power battery system according to Embodiment 4 of the present application. The system can be applied to determine whether thermal runaway occurs in the power battery. The system can be implemented by software and/or hardware and integrated in on the vehicle. In this embodiment, the vehicle includes: an electric vehicle.

As shown in FIG. 5 , the power battery system includes a power battery 520 and a power battery thermal runaway monitoring device 510 ; a monitoring parameter transmission module 511 and a monitoring parameter acquisition module 513 in the power battery thermal runaway monitoring device 510 are equipped with protective devices 512 outside. , the protection device 512 is configured to delay and protect the monitoring parameter transmission module 511 and the monitoring parameter acquisition module 513 to reduce damage to the monitoring parameter transmission module 511 and the monitoring parameter acquisition module 513 .

The protection device 512 may include a protective cover and a jet valve. The jet valve may be set to protect the communication line, the monitoring communication line and the acquisition module. The jet valve may prevent gas from being injected into the acquisition module and the communication line when the power battery is thermally out of control. , to ensure the reliability of the acquisition module, communication line and monitoring communication line. The additional protective cover can also be used to delay the damage of the acquisition module and the disconnection of the communication line and the monitoring communication line.

Optionally, the communication line and the monitoring communication line are intertwined in the monitoring parameter transmission module 511 to ensure that the communication line and the monitoring communication line can be simultaneously blown out when the power battery suffers thermal runaway.

Embodiment 5

The fifth embodiment of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, is used to execute a method for monitoring thermal runaway of a power battery, and the method includes:

Obtain the thermal runaway monitoring parameters of the power battery;

Optionally, when the program is executed by the processor, it can also be used to execute the method for monitoring thermal runaway of a power battery provided by any embodiment of the present application.

The computer storage medium of the embodiments of the present application may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or a combination of any of the above. Computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable Erasable Programmable Read Only Memory (EPROM), flash memory, optical fiber, portable (Compact Disc Read Only Memory, CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above. A computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device. The storage medium may be a non-transitory storage medium.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave, with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms, including electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device .

Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out the operations of the present application may be written in one or more programming languages, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional A procedural programming language, such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server. In situations involving a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or Wide Area Network (WAN), or may be connected to an external computer (eg, use an internet service provider to connect via the internet).

Claims

A power battery thermal runaway monitoring device, wherein the device comprises a monitoring parameter acquisition module, a monitoring parameter transmission module, a thermal runaway judgment module and a safety control execution module; the monitoring parameter transmission module is respectively connected with the monitoring parameter acquisition module and the monitoring parameter acquisition module and the safety control execution module. the thermal runaway judgment module is connected, and the thermal runaway judgment module is connected with the safety control execution module;

The monitoring parameter acquisition module is configured to collect thermal runaway monitoring parameters of the power battery under multiple operating scenarios of the vehicle;

The monitoring parameter transmission module is configured to acquire the power battery thermal runaway monitoring parameters collected by the monitoring parameter acquisition module, and transmit the power battery thermal runaway monitoring parameters to the thermal runaway judgment module;

The thermal runaway judgment module is configured to judge whether the thermal runaway monitoring parameter of the power battery satisfies the thermal runaway condition and monitor whether the monitoring parameter transmission module satisfies the failure condition;

The safety control execution module is configured to determine whether to execute the safety mechanism according to the result output by the thermal runaway judgment module.
The device of claim 1, wherein the monitoring parameter transmission module comprises two intertwined communication wires and a monitoring communication wire;

The communication line is a ring-shaped communication line connecting the monitoring parameter acquisition module and the thermal runaway judgment module, and is configured to transmit the power battery thermal runaway monitoring parameters obtained from the monitoring parameter acquisition module to the thermal runaway judgment module;

The monitoring communication line is a one-way communication line connecting the monitoring parameter acquisition module and the thermal runaway judgment module, and is configured to monitor the communication state between the monitoring parameter acquisition module and the thermal runaway judgment module.
The device according to claim 1, wherein the monitoring parameter acquisition module comprises a sampling chip, a current sensor, a pressure sensor and an input/output I/O interface;

The sampling chip is set to collect the cell voltage and battery temperature of the power battery;

The current sensor is set to collect the total current of the power battery;

The pressure sensor is set to collect the pressure value inside the power battery;

The I/O interface is configured to send and receive monitoring communication signals.
The device according to claim 1, wherein the failure condition of the monitoring parameter transmission module is that the communication line and the monitoring communication line fail simultaneously;

The failure of the communication line is that the thermal runaway monitoring parameters of the power battery received by the thermal runaway judgment module contain invalid values, and the failure of the monitoring communication line is that the thermal runaway judgment module has not received the data sent by the monitoring communication line. Monitor communication signals.
A method for monitoring thermal runaway of a power battery, comprising:

Obtain the thermal runaway monitoring parameters of the power battery;

Determine the judgment result according to whether the thermal runaway monitoring parameter of the power battery meets the thermal runaway condition;

Determine the monitoring result according to the monitoring communication line and whether the communication line meets the failure condition;

Based on the judgment result and the monitoring result, it is determined whether thermal runaway occurs in the power battery.
The method according to claim 5, wherein the determining whether the power battery has thermal runaway based on the judgment result and the monitoring result comprises:

In the case that the judgment result is that the thermal runaway monitoring parameter of the power battery reaches a thermal runaway condition, determining that the power battery has thermal runaway;

In the case that the monitoring result is that the communication line and the monitoring communication line satisfy the failure condition, it is determined that thermal runaway of the power battery occurs.
The method according to claim 5, further comprising: determining whether to perform a fault alarm according to whether the communication line and the monitoring communication line are disconnected;

Wherein, determining whether to perform a fault alarm according to whether the communication line and the monitoring communication line are disconnected includes:

After determining that the monitoring communication line is in a disconnected state, in the case that the communication line is in a normal state, generate fault alarm information of the monitoring communication line, wherein the normal state is that the communication line does not appear at one place disconnect;

After it is determined that there is at least one disconnection of the communication line, it is determined that the monitoring communication line is in a connected state according to the monitoring communication signal of the monitoring communication line, and fault alarm information of the communication line is generated.
The method according to claim 5, wherein after determining whether the power battery has thermal runaway based on the judgment result and the monitoring result, the method further comprises:

Judging the hazard probability and risk factor and determining whether to implement a safety mechanism according to the thermal runaway monitoring results; wherein, the safety mechanism includes downgrading, limiting power, disconnecting high-voltage contactors, performing instrument prompts and buzzing alarms.
A power battery system, wherein the system includes a power battery and a power battery thermal runaway monitoring device, and the power battery thermal runaway monitoring device is inside the power battery;

A protection device is installed outside the monitoring parameter acquisition module and the monitoring parameter transmission module in the power battery thermal runaway monitoring device, and the protection device is configured to delay protection for the monitoring parameter acquisition module and the monitoring parameter transmission module, The damage of the monitoring parameter acquisition module and the monitoring parameter transmission module is reduced.
10. The system of claim 9, wherein the shield includes a battery jet valve and a shield.