Many people are concerned about cable damage from a vehicle crash, as the battery’s current could leak into the metal body of a hybrid or pure electric vehicle. After all, these batteries can provide up to 400 to 800 volts.In this regard, recently, auto parts manufacturer Bosch has recently launched a new semiconductor technology, which can use microchips to cut off power after an electric vehicle accident to prevent electric shocks and prevent vehicle explosions.
At present, there have been many incidents of electric vehicle accidents, fires and explosions. Such accidents have occurred from Tesla to domestically produced Weilai and Weimar. While electric vehicles are becoming more and more popular, their safety also raises concerns. Of course, it does not mean that the accident rate of electric vehicles is necessarily higher than that of traditional fuel vehicles, but as new things, they tend to receive more attention.
In this context, Bosch introduced this new semiconductor technology, whose tiny chips can de-energize battery circuits in less than a second, ensuring the safety of first responders and occupants in vehicles. At present, the microchip developed is small in size and light in weight, but the microchip integrates millions of crystals to activate the safety function within 1 second.
In technical principle, when the vehicle’s airbag sensor detects the impact force, the microchip will trigger the fuse system, and the connection between the vehicle battery and the high-voltage cable of the Electronic parts will be disconnected, thereby eliminating the risk of electric shock or fire of the electric vehicle.
It is understood that the semiconductor device is an integral part of a pyrotechnic safety switch system or high-temperature fuse, which is “exploded” by micro-explosives to quickly and effectively cut the connection between the cable and the high-voltage battery. Bosch semiconductor chips play a decisive role here.
For example, these tiny devices, measuring no more than ten by ten millimeters and weighing just a few grams, trigger a pyrotechnic safety switch system once an airbag sensor detects a crash. The small explosion it causes can sever high-voltage cables between the battery pack and power electronics. In this way, the current is cut off, preventing the risk of electric shock or fire.
The integrated circuit CG912 in the pyrotechnic safety switch system is an application specific integrated circuit (ASIC). Automotive safety is one application of this in specific situations. It is understood that the Bosch application-specific integrated circuit is no larger than the size of a fingernail, but it has assembled millions of transistors, and after a customized design, it can reliably activate the safety function in less than a second.
It is reported that the integrated circuit CG912 was originally developed by Bosch for the triggering of airbags and has been reliably completed millions of tests. Modern vehicles tend to contain dozens of integrated circuits that control not only safety functions such as airbags and seat belt pretensioners, but also cruise control, distance sensors, high beam assist, lane keep support, rain sensors and driver drowsiness detection, etc.