1. A method for early warning and processing after thermal runaway of a battery pack is characterized by comprising the following steps:

s1, monitoring state signals of a battery pack in a charging and discharging process in real time, judging whether the battery pack is out of control due to heat according to the monitored state signals, and if so, executing a step S2; if not, continue to step S1;

s2, displaying a thermal runaway alarm picture through a display screen by alarm information corresponding to the thermal runaway, sending out a voice alarm through an intelligent voice assistant, judging whether a user in the vehicle has vital signs, and if so, executing a step S3;

s3, enhancing a prompt tone of voice alarm, continuously monitoring whether a state signal related to thermal runaway is improved or not, if so, sending out a fire alarm, judging whether vital signs exist in a user in the vehicle or not again, and if so, executing a step S4;

and S4, predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to thermal runaway, and forcing the personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

2. The method as claimed in claim 1, wherein in steps S2 and S3, if there is no vital sign in the user inside the vehicle, the door is closed and locked, the seat is flipped over, and an alarm is given to the outside of the vehicle.

3. The method as claimed in claim 1, wherein the status signal of the battery pack in step S1 includes battery voltage, battery temperature, and gas content in the battery pack.

4. The method as claimed in claim 1, wherein the means for forcing the vehicle occupant to leave the vehicle interior in step S4 includes a means for ejecting the vehicle occupant.

5. The utility model provides an early warning and processing system after battery package thermal runaway takes place which characterized in that includes:

the monitoring module is used for monitoring the state signal of the battery pack in the charging and discharging process in real time and judging whether the battery pack is out of control due to heat according to the monitored state signal;

the early warning module is used for displaying the alarm information corresponding to the thermal runaway by a display screen, sending out a voice alarm by an intelligent voice assistant and judging whether the user in the vehicle has vital signs;

the judging module is used for enhancing prompt tone of voice alarm, continuously monitoring whether a state signal related to thermal runaway is improved or not, if so, sending out fire alarm and judging whether vital signs exist in a user in the vehicle or not again;

and the execution module is used for predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to the thermal runaway, and forcing personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

6. The system of claim 5, wherein the early warning and processing module and the determining module close a door of the vehicle and lift a seat of the vehicle and send an alarm to the outside of the vehicle if the user in the vehicle does not have vital signs.

7. The system as claimed in claim 5, wherein the status signals of the battery pack in the monitoring module include battery voltage, battery temperature, and gas composition in the battery pack.

8. The system as claimed in claim 5, wherein the execution module is configured to force the vehicle occupant to leave the vehicle interior by means of ejection.

Background

The development of electric vehicles is rapid, and lithium ion power batteries become the preferred power source of electric vehicles due to the advantages of high energy density, high specific power, long service life, low self-discharge rate, long storage time and the like. However, during the use of the power battery, the battery thermal runaway, even fire or explosion, caused by overcharge, short circuit, mechanical collision, abuse and the like, endangers the life safety of passengers and also has certain influence on the development of the electric automobile.

At present, a thermal runaway processing method for a battery pack mainly deals with the thermal runaway through modes such as early warning processing, protection design and fire extinguishing design, but the general modes are simpler during early warning processing, such as a mode of lighting a light on a vehicle display screen for prompting and a mode of text prompting.

For example, patent publication No. CN110370984A discloses a thermal runaway warning method for power battery, which calculates the abnormal deviation of the lowest cell voltage to the average voltage and the abnormal deviation of the highest cell temperature to the average temperature according to the real-time detection data of the cell voltage and the cell temperature. And detecting the battery value of the battery module, and calculating the abnormal deviation of the state of charge according to the various detection parameters. Meanwhile, the concentration of the combustible gas and the gas pressure are detected in real time, whether the concentration of the combustible gas reaches a threshold value or not is judged, and whether the gas pressure reaches the threshold value or not is judged. Although the above patent can greatly reduce the harm caused by thermal runaway and reduce the occurrence of lithium ion power battery safety accidents, it is directed to the early stage of thermal runaway, because in practical situations, it is difficult for copiers and rear seat personnel to identify, especially when the people in the vehicle have insufficient knowledge of thermal runaway, some simple prompts are not easy to be perceived. In addition, when the thermal runaway of the battery pack occurs, the thermal runaway explosion of the battery pack once occurs when the owner prepares to get on the vehicle or other people around the vehicle cannot detect the thermal runaway. Therefore, after the thermal runaway happens, a reasonable and effective early warning and processing mode inside and outside the vehicle is provided, and the method is of great importance for reducing the personnel injury caused by the thermal runaway of the battery pack.

Disclosure of Invention

The invention aims to provide a method and a system for early warning and processing after thermal runaway of a battery pack, aiming at overcoming the defects of the prior art and solving the problem of unnecessary personal injury caused by the fact that personnel inside and outside a vehicle cannot perceive the thermal runaway of the battery pack.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for early warning and processing after thermal runaway of a battery pack comprises the following steps:

s1, monitoring state signals of a battery pack in a charging and discharging process in real time, judging whether the battery pack is out of control due to heat according to the monitored state signals, and if so, executing a step S2; if not, continue to step S1;

s2, displaying a thermal runaway alarm picture through a display screen by alarm information corresponding to the thermal runaway, sending out a voice alarm through an intelligent voice assistant, judging whether a user in the vehicle has vital signs, and if so, executing a step S3;

s3, enhancing a prompt tone of voice alarm, continuously monitoring whether a state signal related to thermal runaway is improved or not, if so, sending out a fire alarm, judging whether vital signs exist in a user in the vehicle or not again, and if so, executing a step S4;

and S4, predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to thermal runaway, and forcing the personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

Further, in the steps S2 and S3, if there is no vital sign in the user inside the vehicle, the door is closed and the seat is flipped over, and an alarm is issued to the outside of the vehicle.

Further, the status signal of the battery pack in the step S1 includes a battery voltage, a battery temperature, and a gas composition in the battery pack.

Further, the manner of forcing the vehicle occupant to leave the vehicle interior in step S4 includes a manner of ejection.

Correspondingly, still provide early warning and processing system after battery package thermal runaway takes place, include:

the monitoring module is used for monitoring the state signal of the battery pack in the charging and discharging process in real time and judging whether the battery pack is out of control due to heat according to the monitored state signal;

the early warning module is used for displaying the alarm information corresponding to the thermal runaway by a display screen, sending out a voice alarm by an intelligent voice assistant and judging whether the user in the vehicle has vital signs;

the judging module is used for enhancing prompt tone of voice alarm, continuously monitoring whether a state signal related to thermal runaway is improved or not, if so, sending out fire alarm and judging whether vital signs exist in a user in the vehicle or not again;

and the execution module is used for predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to the thermal runaway, and forcing personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

Furthermore, if the user in the vehicle does not have vital signs in the early warning module and the judgment module, the vehicle door is closed and the lock is closed, the seat is turned over, and an alarm is given to the outside of the vehicle.

Further, the state signal of the battery pack in the monitoring module comprises battery voltage, battery temperature and gas composition in the battery pack.

Furthermore, the mode of forcing the people in the vehicle to leave the vehicle comprises an ejection mode.

Compared with the prior art, the invention has the following beneficial effects:

1. through the picture and voice prompt, passengers at any position in the vehicle can receive the thermal runaway signal in any state, and can quickly escape;

2. through voice and alarm prompt outside the vehicle, people around the vehicle can receive a thermal runaway signal of the vehicle and quickly get away from the thermal runaway vehicle when the thermal runaway happens;

3. through the forced modes such as ejection, personnel in the vehicle are far away from the vehicle with the fault, and the injury of the personnel is reduced.

Drawings

Fig. 1 is a flowchart of an early warning and processing method after thermal runaway of a battery pack occurs according to an embodiment;

fig. 2 is a structural diagram of an early warning and processing system after thermal runaway of a battery pack occurs according to the second embodiment.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The invention aims to provide a method and a system for early warning and processing after thermal runaway of a battery pack, aiming at the defects of the prior art.

Example one

The embodiment provides a method for early warning and processing after thermal runaway of a battery pack, as shown in fig. 1, the method includes the following steps:

s1, monitoring state signals of a battery pack in a charging and discharging process in real time, judging whether the battery pack is out of control due to heat according to the monitored state signals, and if so, executing a step S2; if not, continue to step S1;

s2, displaying a thermal runaway alarm picture through a display screen by alarm information corresponding to the thermal runaway, sending out a voice alarm through an intelligent voice assistant, judging whether a user in the vehicle has vital signs, and if so, executing a step S3;

s3, enhancing a prompt tone of voice alarm, continuously monitoring whether a state signal related to thermal runaway is improved or not, if so, sending out a fire alarm, judging whether vital signs exist in a user in the vehicle or not again, and if so, executing a step S4;

and S4, predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to thermal runaway, and forcing the personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

In step S1, monitoring a state signal of the battery pack in real time during charging and discharging, and determining whether thermal runaway of the battery pack occurs according to the monitored state signal, if so, executing step S2; if not, the process continues to step S1.

In the charging and discharging process of the battery pack, signals such as the voltage, the temperature and the gas components in the battery pack are monitored by an active monitoring method to judge whether the thermal runaway of the battery pack occurs. Wherein the signal accessible sensor of monitoring in the battery package obtains, specifically is: a plurality of sensors such as a temperature sensor, a voltage detection module, an air pressure sensor, a component detection module and the like can be connected in the battery management system, and whether thermal runaway of the battery pack occurs or not can be judged through signals acquired by the sensors.

In step S2, the alarm information corresponding to the thermal runaway is displayed on a display screen, a warning map of the thermal runaway is displayed, a voice warning is sent by an intelligent voice assistant, whether a vital sign exists in a user in the vehicle is determined, and if yes, step S3 is executed.

When the thermal runaway of the battery pack occurs, the display screen in the vehicle and the intelligent voice assistant send out a thermal runaway alarm picture and a voice alarm to prompt the personnel in the vehicle to escape and detect whether the personnel in the vehicle have vital signs or not.

The vital signs can be detected by a heart rate sensor, a blood pressure sensor and the like in the vehicle.

If no vital sign exists, the door is locked, the seat is turned over, people are prevented from getting on the vehicle in the period, the vehicle thermal runaway fault of the vehicle owner is reminded through a remote signal, and the vehicle is timely rescued; meanwhile, an alarm is given out outside the vehicle to remind people around the vehicle to keep away from the vehicle, and the battery pack is prevented from being injured by the people caused by explosion due to thermal runaway.

If there is a vital sign, step S3 is executed.

In step S3, the warning tone of the voice alarm is enhanced, and whether the status signal related to the thermal runaway is increased is continuously monitored, if yes, a fire alarm is issued, whether vital signs exist in the user in the vehicle is determined again, and if yes, step S4 is executed.

When still having vital sign in detecting the car, initiatively open the door, the warning prompt tone of thermal runaway strengthens, when the thermal runaway signal that detects is more obvious, sends the fire control warning, whether personnel exist vital sign in the car once more simultaneously.

If no vital sign exists, the door is locked, the seat is turned over, people are prevented from getting on the vehicle in the period, the vehicle thermal runaway fault of the vehicle owner is reminded through remote signals, meanwhile, the alarm is sent out from the outside of the vehicle, people around the vehicle are reminded to keep away from the vehicle, and the damage to people caused by the explosion of the battery pack due to the thermal runaway is prevented.

If there is a vital sign, step S4 is executed.

In step S4, the time when the battery pack relief valve is opened is predicted based on the detected state signal relating to thermal runaway, and the vehicle interior person is forced to leave the vehicle interior when the predicted time is a predetermined time left after the relief valve is opened.

When vital signs still exist in the vehicle, opening time of the battery pack pressure release valve is predicted according to battery detection signals (such as voltage, temperature and battery pack components of a battery), and when the distance between the opening time and the remaining 3min of the battery pack pressure release valve is left, people in the vehicle are forced to leave an accident vehicle through modes such as ejection.

The method specifically comprises the following steps: after thermal runaway occurs, the thermal runaway alarm signal is strengthened under the condition that vital signs still exist in the vehicle, and finally, people in the vehicle are far away from the vehicle in the mode of forced ejection and the like in the vicinity of 1 minute before thermal runaway diffusion (which can also be set to be 2, 3, 4 and the like).

Compared with the prior art, the embodiment has the following beneficial effects:

1. through the picture and voice prompt, passengers at any position in the vehicle can receive the thermal runaway signal in any state, and can quickly escape;

2. through voice and alarm prompt outside the vehicle, people around the vehicle can receive a thermal runaway signal of the vehicle and quickly get away from the thermal runaway vehicle when the thermal runaway happens;

3. through the forced modes such as ejection, personnel in the vehicle are far away from the vehicle with the fault, and the injury of the personnel is reduced.

Example two

This embodiment provides an early warning and processing system after battery package thermal runaway takes place, as shown in fig. 2, includes:

the monitoring module 11 is used for monitoring a state signal of the battery pack in a charging and discharging process in real time and judging whether the battery pack is out of control due to heat according to the monitored state signal;

the early warning module 12 is used for displaying the alarm information corresponding to the thermal runaway by a display screen, sending out a voice alarm by an intelligent voice assistant and judging whether the user in the vehicle has vital signs;

the judging module 13 is used for enhancing the prompt tone of the voice alarm, continuously monitoring whether the state signal related to the thermal runaway is improved or not, if so, sending out a fire alarm, and judging whether the user in the vehicle has vital signs or not again;

and the execution module 14 is used for predicting the opening time of the pressure release valve of the battery pack according to the detected state signal related to the thermal runaway, and forcing the personnel in the vehicle to leave the vehicle according to the predicted time when the preset time is left after the pressure release valve is opened.

Furthermore, if the user in the vehicle does not have vital signs in the early warning module and the judgment module, the vehicle door is closed and the lock is closed, the seat is turned over, and an alarm is given to the outside of the vehicle.

Further, the state signal of the battery pack in the monitoring module comprises battery voltage, battery temperature and gas composition in the battery pack.

Furthermore, the mode of forcing the people in the vehicle to leave the vehicle comprises an ejection mode.

It should be noted that the early warning and processing system for a battery pack after thermal runaway is similar to the embodiment, and will not be described herein again.

Compared with the prior art, the embodiment has the following beneficial effects:

1. through the picture and voice prompt, passengers at any position in the vehicle can receive the thermal runaway signal in any state, and can quickly escape;

2. through voice and alarm prompt outside the vehicle, people around the vehicle can receive a thermal runaway signal of the vehicle and quickly get away from the thermal runaway vehicle when the thermal runaway happens;

3. through the forced modes such as ejection, personnel in the vehicle are far away from the vehicle with the fault, and the injury of the personnel is reduced.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.