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The experimental data shows that when the temperature of the battery cell reaches 135 ℃, the separator begins to melt and the voltage drops; The battery voltage drops rapidly at 150 ℃; When the temperature reaches 245 ℃, the diaphragm completely collapses, and the battery will experience a phenomenon of fire and explosion.

Manufacturers can address this from two aspects: battery design and bMS battery management system. From the perspective of battery design, materials can be developed to prevent thermal runaway reactions and prevent thermal runaway reactions; From the perspective of battery management, different temperature ranges can be predicted to indicate different safety levels, thus providing graded alarms.

The power lithium-ion batteries of electric vehicles on the market today all contain thermal management systems, which use air or water cooling methods to dissipate heat from the batteries. Users should start from their usage habits to eliminate heat triggers, such as guarding against direct sunlight on vehicles, avoiding flammable materials in the vehicle, and regularly preparing on-board fire extinguishers to eliminate spontaneous combustion factors. In addition, always pay attention to the battery temperature information on the dashboard or central control screen. Generally speaking, the working temperature of the battery unit is between 40 ℃ and 50 ℃, and above or below this temperature range is not conducive to battery use.

Electrochemical inducement

Impurities in battery manufacturing, metal particles, shrinkage caused by charging and discharging expansion, and lithium evolution may all cause internal short circuits. This internal short circuit occurs slowly and for a very long time, and it is unclear when it will experience thermal runaway. If conducting experiments, it is not possible to repeat the verification. At present, experts around the world have not found a process that can replicate internal short circuits caused by impurities, and are all under research.

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