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The thermal runaway of lithium iron phosphate batteries is mainly due to the fact that the internal heat generation is much higher than the heat dissipation rate, accumulating a large amount of heat inside the lithium-ion battery, causing a chain reaction and causing the battery to catch fire and explode.

(1) Overheating, overheating, and loss of control

The reasons for overheating of power lithium iron phosphate batteries come from unreasonable battery selection and thermal design, or external short circuits causing temperature rise of the battery, loose cable joints, etc., which should be addressed from two aspects: battery design and battery management. From the perspective of battery material design, materials can be developed to prevent thermal runaway and block thermal runaway reactions; From the perspective of battery management, different temperature ranges can be predicted to indicate different safety levels, thus providing graded alarms.

(2) Overcharging causes overheating and loss of control

The thermal runaway triggered by overcharging refers to the lack of safety function of the overcharging circuit in the lithium iron phosphate battery management system, resulting in the BMS of the battery being out of control but still charging. The solution to this type of overcharging is to first identify the fault of the charger, which can be solved through complete redundancy of the charger; Secondly, it depends on whether battery management is reasonable, such as not monitoring the voltage of each battery.

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