Abstract: As one of the energy storage carriers, lithium-ion batteries provide important support for new energy grid connection, power grid peak shaving and frequency modulation. With the development of lithium-ion battery energy storage technology, the safety problem cannot be ignored. By analyzing the causes of the explosion accident of the lithium-ion battery energy storage container, it can be seen that the combustible smoke released by the thermal runaway of the lithium-ion battery is the main cause of the explosion. According to the principle of three elements of combustion, a comparative test of thermal runaway flame retardancy of lithium iron phosphate battery with CO2 gas protection was designed. According to the test results, the CO2 inerting type lithium-ion battery energy storage container is preliminarily planned and designed to provide technical support for the safety design of lithium-ion battery energy storage power station.

Key words: lithium-ion battery；energy storage, thermal runaway, lnerting