Method and device for analyzing gas production rate of lithium battery under thermal runaway

The invention discloses a method and device for analyzing the gas production rate of a lithium battery under thermal runaway, and the method comprises the steps: putting a single battery core with a top cover being cut into a heating device for heating, and collecting pressure information and temperature information; detecting the state change of the single battery core along with the temperatureto obtain the self-heat-release starting temperature and the thermal runaway occurrence critical point temperature of the single battery core; calculating to obtain the relationship between the electrolyte vapor pressure and the temperature in the heating device in a time period from the beginning of the single battery core to the beginning of heat release of the single battery core; in the time period from the heat release starting temperature to the thermal runaway occurrence critical point temperature of the single battery core, calculating according to the electrolyte vapor pressure to obtain the relationship betw