Abstract: The thermal runaway characteristics of 20 Ah square lithium titanate battery under overcharge condition were studied, and the variation rules and parameters of temperature, voltage, gas composition and content of lithium titanate battery under 100% SOC condition were obtained. Experiments showed that the jet flame of lithium titanate battery is more severe after thermal runaway. In order to restrain the propagation of thermal runaway of lithium titanate battery in modules effectively, a solution of using perfluoroh exanone inhibitor to inert the use space of lithium titanate battery before thermal runaway wasproposed. Through the experiments, it is verified that the early release inhibitor can inhibit the thermal runaway expansion of the battery moduleeffectively, and the key technical parameters such as the release time and inerting concentration of the inhibitor were obtained.

Key words: lithium titanate battery, thermal runaway, module, thermal runaway propagation, inhibitor, inert