A battery pack 100 includes multiple series-connected battery modules 200 and a battery pack controller 140. Each group of battery modules 200 includes a switch or relay 133 which switches between connecting the battery module group 200 into the series circuit or bypassing the battery module group 200 thus isolating it from the series circuit. The isolated battery module group 200 has a voltage below the safe extra low voltage (SELV) level. The battery pack controller 140 may operate the switch 133 when the vehicle is switched off, in the event of a crash, or when a battery module 200 is determined to have failed. Battery module failure is determined by monitoring the state of health, impedance, thermal properties, and other factors relating to the battery module 200. The battery modules 200 may be submerged in a dielectric liquid which prevent fire and thermal runaway. Pressure sensors and level sensors are used to monitor the dielectric liquid and to determine whether gas must be released.
Battery pack controller - safety and reliability of battery pack
2020-12-02
Patent
Electronic Resource
English
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