Recently , electric vehicles have become a hot spot due to the lock-up of electricity, which has led to the emergence of this phenomenon. Perhaps electric vehicle companies are really afraid of the spontaneous combustion of electric vehicles.
A consumer complained that his electric car was upgraded online by the car company through the background OTA battery management system BMS, which limited the available power of the car’s power battery (estimated to be locked by 10%), resulting in a significant reduction in battery life ; the maximum output power of the battery was limited, and it was locked to 60 %. % or so, resulting in a significant drop in acceleration performance, so why do car companies quietly upgrade battery management systems to limit battery performance?
This starts from the characteristics of the battery itself. Overcharging or overdischarging the battery will lead to damage to the battery life. Avoiding this situation by locking the battery will help prolong the battery life; whether the battery is charged or discharged, it will generate heat, and the electric The power battery pack of the car is a collection of thousands of batteries, so the heat generated during charging and discharging is particularly considerable, and the maximum output power of the lock is limited to help reduce the heat generated during discharge.
In addition, car companies may increase the charge and discharge threshold of the battery when leaving the factory to give consumers a feeling of strong endurance, and increase the output power of the battery to enhance its acceleration performance in order to give stronger performance. The Limits of Batteries gets some leading parameters to challenge EV leaders for marketing.
However, this kind of excessively increasing the performance of the power battery is very dangerous. In addition to damaging the life of the battery, it may also lead to self-ignition and fire accidents. Now many consumers have paid attention to this problem, so auto companies upgrade the power lock through OTA to ensure that The safety of the power battery reduces the chance of a fire accident.
In recent years, the sales of electric vehicles in the Chinese market have skyrocketed, and it has become the world's largest new energy vehicle market for several consecutive years.
According to data from the China Passenger Car Association, at the beginning of 2021, new energy vehicles accounted for only about 10% of China's overall car sales, and by the end of 2021, the proportion had exceeded 20%. Hot sales to the point of being out of stock, a benchmark brand of domestic new energy vehicles now takes 2-3 months to place an order before picking up the car, which shows how popular new energy vehicles are today.
However, with the rapid increase in the sales of electric vehicles, the number of self-ignition accidents of electric vehicles is also increasing. Compared with fuel vehicles, which are easy to put out after fire, electric vehicles are difficult to put out after self-ignition. A report in the United States pointed out that a leading brand of electric vehicles caught fire. After several fire trucks arrived, it took 4 hours to put out the fire, but it still failed to stop the fire of the car, and finally the car was burned to scrap metal.
Consumers are afraid of the consequences of self-ignition and fire of electric vehicles. This situation has occurred a lot. Electric vehicle companies have finally paid attention to the safety of electric vehicles. This should be the reason why electric vehicle companies choose to lock the electricity to reduce the probability of self-ignition of electric vehicles. reason.