Abstract: A system for detecting gas leakage within a battery pack includes a battery pack, a controller, and a detector. The battery pack comprises a plurality of cells which may be subject to a gas leakage. The detector is configured to sense a concentration value of one or more gases. The detector is further configured to generate a return signal indicative of no alarm, a first alarm level, or a second alarm level. The detector is electrically connected to the controller and is configured to transmit the return signal to the controller. The controller is configured to output a first alarm level or a second alarm level in response to the return signal. Emergency response procedures may be implemented based on the level of gas leakage within the battery pack indicated.

Abstract: A method of detecting a cell venting event in a battery pack includes determining a rate of increase of the concentration of a gas in the battery pack with respect to time, and providing an indication that the determined rate of increase of the concentration of the gas has exceeded a first preset rate of increase threshold value.