Current problems and status quo of power management system for power lithium-ion battery

The power management system of the power lithium-ion battery is also called the battery protection board. At present, the important problems in the development of power lithium battery power system are: the safety and service life of power lithium ion batteries are significantly reduced after grouping, and serious accidents such as battery combustion and explosion even occur. The important reason for the above problems is the lag in the research of group technology, group application technology and equipment; to realize the system integration of electric lithium battery, and provide users with the technology and products of electric lithium battery system integration, to solve current problems and promote electric lithium battery An important task for development. At present, single-power lithium batteries have basically met the conditions for popularization and application, but the existing group technology, group application technology and equipment level are not yet mature. In other words, the single-power lithium battery basically solves the safety and life issues. The key to the development of power lithium batteries is battery pack technology and BMS technology. Necessity and importance of power management system: Overcharge and overdischarge are fatal to the battery. The difference is that a large amount of gas is generated during overcharge, which is prone to spontaneous combustion and explosion. The appearance is strong. The appearance of overcharge changes smoothly, but the speed of failure is extremely high. Quickly, it should be strictly prevented during normal use. A battery, if it is overcharged or overdischarged during the charging and discharging process, it will cause a series of problems, such as the increase of the internal resistance of the battery, the evolution of lithium anode, and the reduction of capacity, which will lead to the safety and Shorten the life time. Regarding the battery pack, the electrical performance of a single battery before grouping is basically the same, and the performance consistency of a single battery must be maintained during use, so that the battery can give full play to the purpose of 1+1>1. Power management system construction: The battery management system is the most comprehensive device that knows the performance and status of the battery. Therefore, the battery management system and the establishment of a connected charger, the charger can understand the real-time information of the battery in order to more effectively solve the battery charging problem. The current battery management system is based on the SOC status of a single battery such as voltage, current, and temperature. The battery management system manages the use process of the battery pack and adjusts the status of each battery in the battery pack, which can maintain the consistency of each single battery battery pack in the country. To a certain extent, prevent the difference in battery performance caused by accelerated decline. status. The development of power lithium batteries should improve the control level of battery processing technology, scientific battery screening and combination methods, and effective battery management systems. BSMS can not only track and collect data in real time, but also control charging and discharging in real time. Power management system functions 1. Monitoring function: The monitoring function is the most basic function of the power management system, which provides reliable data for the management function. Monitoring includes parameters such as battery terminal voltage, current, and temperature. 2. Protection function: The protection function includes overcharge protection, over discharge protection, short circuit protection, reverse connection protection, overload protection, temperature protection, etc. 3. Measurement function: The measurement function is to dynamically report the state of charge of the battery during use. In theory, there is a certain correspondence between battery voltage and capacity, and battery life can be judged by comparing battery state of charge data with theoretical state of charge data. 4. Control function: Connect the battery status to the external connection through the interface and communication protocol to realize the automatic control or remote control function. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is a high-rate polymer lithium-ion battery?