New energy vehicles predominantly use lithium batteries, which have advantages such as high energy density but also come with certain drawbacks. For instance, the battery pack is prone to combustion and explosion when deformed by external forces. Additionally, the high-voltage circuit must be able to withstand stress, as damage or short circuits in the circuit itself can also cause significant loss.

However, these issues mainly arise during vehicle collisions. If the high-voltage circuit output can be immediately cut off during a severe collision, the risk of such incidents can be minimized. Many car brands have implemented relevant protective measures in practical vehicle applications. For example, brands like Volkswagen use Pyrofuse, which employ a pyrotechnic method to break the circuit instantaneously upon collision, controlled by the airbag control unit, similar in principle to airbags.

When a vehicle collision occurs, the control unit receives the impact signal from the collision sensor. The airbag control unit then decides whether to deploy the airbags and trigger the Pyrofuse based on the actual situation. If needed, the control unit immediately sends a signal to activate the Pyrofuse. Upon receiving the trigger signal, the Pyrofuse ignites explosives to cut the fuse, usually within a few milliseconds, resulting in an extremely fast response time.

Of course, this type of fuse is single-use; once triggered, the battery pack must be opened and the fuse replaced before the battery can be used again.