The battery management system BMS is a new product that was born in this century. Because the electrochemical reaction is difficult to control and the material performance changes in this process are elusive, such a housekeeper is needed to constantly supervise and adjust the behavior of the battery pack. To ensure safe use, its main functions are:

1. Accurately estimate the state of charge of the power battery pack

Accurately estimate the state of charge (SOC) of the power battery pack, that is, the remaining battery capacity, to ensure that the SOC is maintained within a reasonable range, and to prevent damage to the battery due to overcharge or overdischarge, so as to predict hybrid power at any time How much energy is left in the car's energy storage battery or the state of charge of the energy storage battery.

2. Dynamically monitor the working status of the power battery pack

During the battery charging and discharging process, the terminal voltage and temperature of each battery in the power battery pack, the charging and discharging current and the total voltage of the battery pack are collected in real time to prevent the battery from overcharging or overdischarging. At the same time, the battery status can be given in time, the problematic battery can be selected, and the reliability and efficiency of the entire battery group can be maintained, making the realization of the remaining power estimation model possible. In addition, it is necessary to establish a history file of each battery to provide information for further optimization and development of new types of electricity, chargers, motors, etc., and to provide a basis for offline analysis of system failures.

3. Balance between single cells

That is, the single battery is charged in a balanced manner, so that each battery in the battery pack reaches a balanced and consistent state. Equalization technology is the key technology of a battery energy management system that is currently being researched and developed in the world.