A pyrotechnic battery disconnect, which I suppose cuts the connection to the battery instantly in case of accident to avoid shorting it. There are already pyrot

A pyrotechnic battery disconnect, which I suppose cuts the connection to the battery instantly in case of accident to avoid shorting it. There are already pyrotechnic devices in cars: airbags are pyrotechnic, as well as safety belt detents. It's the fastest type of actuator.