Domestic power stations of LiFePO

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battery energy storage have been built and put into operation on a large scale

however

the thermal runaway risk of lithium iron phosphate batteries is relatively prominent

and the fire hazard of energy storage power stations always exists. Aiming at the LiFePO

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battery

we designed the adiabatic thermal runaway fixed-point cooling experiments. The electrical and material characteristics of LiFePO

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batteries in different stages of thermal runaway were studied. Then

the starting temperature point of self heating

the starting temperature point of self production heat

the opening temperature point of pressure relief valve and the highest temperature point of thermal runaway were gained. Finally

change rules of composition and structure changes of solid components such as positive pole

negative pole and

diaphragm were analyzed. The results show that the initial reaction of thermal runaway of LiFePO

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battery is mainly concentrated in the negative pole and electrolyte

and the safe treatment temperature range is 60～100 ℃ under the risk of thermal runaway. The study can provide important data support for the safety protection and thermal runaway warning of LiFePO

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battery energy storage power stations.