In general, electric vehicle battery management systems must implement the following functions:
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 power, to ensure that the SOC is maintained within a reasonable range, to prevent damage to the battery due to overcharge or overdischarge, thereby predicting the 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.
Dynamic monitoring of the working status of the power battery pack:
During the charging and discharging process of the battery, the terminal voltage and temperature, the charging and discharging current and the total battery pack voltage of each battery in the battery pack of the electric vehicle (which should be the power battery pack) are collected in real time to prevent the battery from being overcharged or overdischarged. . At the same time, the battery condition can be given in time, and the problematic battery can be selected to maintain the reliability and high efficiency of the entire battery operation, and the realization of the remaining battery estimation model becomes possible. In addition, it is necessary to establish a usage history file for each battery to provide data for further optimization and development of new types of electricity, chargers, motors, etc., and to provide a basis for offline analysis system failure.
Equilibrium between cells and battery packs:
That is, the cells are balanced between the battery cells and the battery packs, so that the batteries in the battery pack are in a balanced state. Battery balance is generally divided into active equalization and passive equalization.