With the continuous high sales of new energy vehicles, the demand for power batteries is expanding, and battery management system (BMS), as an important part of new energy vehicle batteries, will also develop rapidly. This report mainly answers the recent concerns of BMS industry, mainly involving: 1) what are the key problems in the development of BMS industry; 2) What are the technical development trends of BMS industry in the future
What are the key issues in the development of BMS industry?
The first is the safety of electric vehicle batteries. Electric vehicle fires and explosions occur frequently, and there is an upward trend year by year. In 2020, there were 124 new energy vehicle fires reported by the media in China, which is significantly higher than that in 2019. The main cause of electric vehicle fire is battery failure. The factors causing battery failure mainly include external collision, line aging, overcharge and discharge and high temperature environment. BMS system is an important tool to ensure battery safety, but the existing technical level can not ensure the absolute safety of battery The level of monitoring accuracy and temperature detection still needs to be improved.
The second is to reduce the cost of new energy vehicles. The battery cost accounts for the highest proportion in the cost of new energy vehicles. In addition to improving the functional effect of BMS to improve the battery endurance and service life, so as to reduce the battery cost, BMS, as an important part of battery, also needs to reduce its own cost. The cost can be reduced by optimizing device and system design and friendly component connection methods.
Finally, the problem of improving battery life. The main factors affecting battery life are charging cycle times, average power of charge and discharge, battery ambient temperature and deep discharge BMS can improve battery life by optimizing fast charging and improving temperature monitoring accuracy
What are the technical development trends of BMS industry in the future?
In the future, BMS technology will develop in the direction of passive equalization, wireless BMS and cloud BMS. With the enhancement of battery consistency, passive equalization management has high cost performance It is still the mainstream choice of manufacturers; Wireless BMS is in the initial stage of development. It can replace the traditional wired connection with lower cost and better performance. It is the development trend in the future; With the rise of AI, cloud computing and big data, BMS will develop to the cloud. In the future, BMS will calculate the battery through the cloud, which will be more accurate and efficient
