From October 25th to October 26th, 2019, the China Body Assembly and the China Banking Leadership Summit of Anbank were grandly held in Macau. Autoliv, as the current chairman, was invited to attend the summit. At the meeting, Autoliv put forward a solution to the safety problem of new energy vehicles, starting from the new generation of "power-off safety protection switch".
New energy vehicle safety challenges
At present, China's new energy vehicle production and sales have ranked first in the world for four consecutive years, and gradually entered the "overtaking lane" for new energy development. But the frequent occurrence of new energy vehicle fires in the past two years has pushed its battery safety issues to the forefront.
In order to meet consumers' requirements for cruising range and charging speed, when the battery system space is limited, most companies increase the voltage and current by squeezing the battery density. Once a collision occurs, the risk of current overload is more likely to occur. Therefore, new energy vehicles Battery protection becomes critical.
Current power-off safety protection scheme
The key to automobile current overload protection is to cut off the short-circuit power supply in the shortest time to prevent the strong current from damaging the circuit components, causing the components to overheat and catch fire.
Prospective technology, Autoliv, power failure safety protection scheme
At present, most new energy vehicles in the market use high-voltage relays and high-voltage fuses (fuses) to prevent the risk of fire caused by overload of circuit circuits. When the current is within a certain range, the on / off of the loop can be controlled by the relay; only under the higher fault current, the fuse will start to work, and the loop current will be cut off by fusing the body.
When the current is higher than the working range of the relay, but the fuse fuse energy is not reached or the response time is long, it is enough to damage the circuit components such as the relay and cause high temperature fire. The market urgently needs new solutions for the gray areas that fuses and relays cannot meet.
New power-off safety protection switch promotes safety upgrade of new energy vehicles
Unlike fuses, which require a certain current value to trigger their function, the trigger signal of the power-off safety protection switch (PSS) can come from both the collision control unit and the BMS. After receiving the signal, the power output is cut off within 1 millisecond to prevent the fire from the root cause, reducing or eliminating the harm caused to the occupants and the surrounding area by the vehicle fire.
Power-off safety protection switch (PSS) series, as the exclusive technology, has a number of technical patents. It can complete power-off protection within one thousandth of a second, greatly prioritize similar products in sensitivity, and is not easy to age with time and is durable . In addition, different models of PSS can also meet different power models, such as PSS4 and PSS5 are specially built for new energy vehicles, and can also be used to protect the safety of charging stations.
Prospective technology, Autoliv, power failure safety protection scheme
Facing the rapid changes in the automotive industry, Autoliv adheres to the vision of "saving more lives". While continuously improving the level of automotive safety technology to adapt to new development trends, it will also continue to deepen its cooperation with ADB China to The public is popularizing the concept of safe travel, and looks forward to achieving a "zero casualty" road safety environment in the future.