A warning method after thermal runaway of battery pack

Abstract

The invention discloses a warning method after a battery pack is thermally out of control, including a BMS; monitoring the temperature of each module of the battery pack and transmitting the real-time temperature of each module to a temperature sensor of the vehicle controller; Vehicle controller: The vehicle controller judges the thermal runaway state of the battery pack according to the temperature sensor signal. If the temperature of the temperature sensor is greater than the preset value and the temperature continues to rise, the vehicle controller calculates the predicted explosion time based on the neural network. Send a warning signal to the outside world. This invention solves the problem that after the thermal runaway alarm occurs in the vehicle, even if the temperature sensor of the battery pack is damaged and the BMS cannot work, it can still give the information of whether to alarm according to the state of the vehicle battery pack, so as to ensure that no one approaches at the moment of explosion. At the same time, the countdown to the explosion in the thermal runaway state can be realized, and the countdown time and alarm status can be updated in real time.

Description

technical field [0001] The invention relates to the technical field of battery pack control, in particular to a warning method after a battery pack is thermally out of control. Background technique [0002] The sales of new energy vehicles at home and abroad are increasing year by year. However, the frequent spontaneous combustion of electric vehicles hinders the promotion of electric vehicles. How to improve the safety of electric vehicles is an urgent problem to be solved in the promotion of electric vehicles. [0003] Due to the tightening of national regulations and the frequent spontaneous combustion of new energy vehicles and other serious problems, the industry has gradually begun to conduct research on thermal runaway of power batteries, but the focus at this stage is on how to extract and detect thermal runaway and issue thermal runaway alarms in advance , to remind the occupants to evacuate, ensure the safety of the occupants, and improve the safety of the power ba...

AI Technical Summary

Problems solved by technology

However, due to the temperature sensor of the battery pack, the circuit board will be damaged at about 100°C, and once the thermal runaway of the electric vehicle occurs, the temperature rise rate is very large, which causes the BMS (battery management system) to issue a thermal runaway alarm signal several times. Within minutes, the BMS cannot function normally due to overheating, so that it cannot continue to alarm

[0005] However, it usually takes about half an hour from when the BMS issues a thermal runaway alarm to when the battery explodes (the time is different for different battery packs), which causes the driver or rescue team to be unable to see the thermal runaway alarm after the BMS is damaged, and mistakenly think that The electric car has safely approached the vehicle, making it impossible to evacuate at the moment of the vehicle explosion

[0006] The Chinese patents with publication numbers CN110161414A, CN109669129A, and CN112297848A all exist: after thermal runaway occurs, if the temperature rises too fast and the BMS cannot work, the system will fail and cannot remind the driver or rescuers

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