The development trend of power lithium battery performance can be divided into several aspects, such as high specific energy, high safety, long cycle, and low cost, and each performance is mutually restrictive. At present, as the energy density of the battery system increases from 100Wh/kg to about 200Wh/kg, the battery pack capacity is upgraded from 30kWh to about 100kWh, and the vehicle voltage platform is increased from 400V to 800V, the number of new energy vehicles has increased from millions to tens of millions, and the importance of power battery safety has become increasingly prominent, and has become the focus of a new round of competition in the new energy vehicle industry.
