The pyrotechnical safety switch system, or pyrofuse, sets off a series of small explosions. Those drive a wedge into the high-voltage cable linking the battery and the power electronics, theoretically eliminating the flow of current and risk of electric shock or fire. The use of explosions may sound dramatic, but these pyrotechnics are so small they'd likely go unnoticed. Similar explosions are often used to trigger airbags.

Of course, if the battery itself is damaged that opens up new risks, but the Bosch system could help address the specific concerns of voltage leaking into the rest of the vehicle.