In the context of accelerating the upgrading and iteration of new energy vehicles in China, and the enterprises attaching more importance to product safety, active equalization is expected to become the main technical direction of the future equalization function of BMS in China.
In the development of new energy vehicles, the power battery has long been regarded as a key component to drive the industry's development. With the acceleration of industry technology innovation and the increase of user awareness, the market demand for power batteries is getting higher and higher, but the issues of power battery safety and security, service life and energy prediction have become innovation bottlenecks.
At this time, the battery management system (BMS), as an important link in the energy management and control of electric vehicles, is gradually regarded as a core technology by OEMs, and constitutes the three major electrical and electronic core technologies of new energy vehicles together with electric control systems such as drives and vehicle control systems such as VCU.
In the past two years, driven by the rapid development of the domestic new energy vehicle market, the scale of the domestic power battery BMS market demand is also growing rapidly. 2017, China's new energy vehicle power lithium battery achieved an installed base of 811,000 sets, an increase of 56.26%, with market size of 4.55 billion yuan. GGII data show that in 2018, the installed capacity of China's new energy vehicle power lithium battery BMS products reached 1.22 million sets, with an output value of 5.55 billion yuan.
From the perspective of China's BMS market competition pattern, the current third-party market share has seen a steady increase in momentum, with the third-party represented by Kelee Technology, Yenergy Electronics, Lixinxin Energy, Shanghai Miao Yi, etc. in the market share is growing steadily, especially in the commercial vehicle field third-party even become dominant. Although the vehicle manufacturers and battery manufacturers still occupy a more important position, but due to the industry in the technology improvement and specialized division of labor brought about by the cost reduction, professional third-party advantages are expected to be more prominent in the future.
From the industry technology trend, the BMS equalization control is one of the technical high points to extend the power battery life. At present, the passive equalization is relatively mature due to the early emergence of technology, and the passive equalization has less impact on the battery life and lower cost, which fits the current market situation that China's new energy vehicles are mainly concentrated in the middle and low end, so car companies generally take passive equalization.
However, because passive equalization uses resistance to dissipate energy, it generates heat, which reduces the efficiency of the whole battery system. The active equalization, because of its principle of energy transfer and distribution, can make the power battery energy utilization high and significantly improve the driving experience.
In the context of accelerating the upgrading and iteration of new energy vehicles in China, and the enterprises' attention to product safety, active equalization is expected to become the main technical direction of the future equalization function of BMS in China.
