Lithium-ion batteries need to use protection circuits during use, including overcharge protection, overcurrent/short-circuit protection and overdischarge protection. During the use of the battery, overcharge, overdischarge and overcurrent will affect the battery life and performance, and in serious cases will lead to lithium-ion battery combustion and explosion, so each lithium-ion battery should be installed with a safety protection board, which consists of a special IC and several external components. Through the protection circuit to effectively monitor and prevent damage to the battery, to prevent overcharge, overdischarge and short circuit caused by the risk of combustion, explosion and so on. The market for lithium-ion battery protection circuit and its management system is billions of dollars per year, and the market potential is huge.
Battery management system is an important component necessary for new energy vehicles, and together with the power battery pack, it constitutes a battery system to provide power for new energy vehicles. The specific tasks of the battery management system mainly include collecting the data of the single battery in the battery pack, communicating with other car parts for data, estimating the working status of the battery pack (including the charge status and health status of the battery), implementing thermal management of the battery, balancing the power of the single battery between the battery pack, diagnosing and alarming the battery system failure, etc. Some of them also have the ability of charging management.
