New energy vehicles commonly known as the three parts for batteries, motors, electronic control. Among them, electronic control mainly refers to battery management system, also known as BMS.
BMS is mainly used for real-time monitoring, fault diagnosis, SOC estimation, mileage estimation, short circuit protection, leakage monitoring, display alarm, charge and discharge mode selection of the power battery parameters of electric vehicles, and information interaction with the vehicle integrated controller or charger by means of CAN bus to ensure the efficient, reliable and safe operation of electric vehicles.
Real-time tracking of battery running state and parameter detection: real-time acquisition of battery charge and discharge state, data acquisition of battery total voltage, battery total current, battery temperature in each battery box and single module battery voltage. Because the power battery is used in series, the real-time, fast and accurate measurement of these parameters is the basis of the normal operation of the battery management system.
Residual power estimate: battery residual energy is equivalent to the amount of oil in a traditional car. Charge status (SOC) is estimated to enable drivers to understand the system in a timely manner. real-time acquisition of charge and discharge current, voltage and other parameters, and the corresponding algorithm to estimate the remaining electricity.
Charge and discharge control: according to the charged state of the battery to control the charge and discharge of the battery, when a parameter exceeds the standard such as the single cell voltage is too high or too low, in order to ensure the normal use of the battery pack and performance, the system will cut off the relay. Stop battery energy supply and release.
Heat management: real-time collection of battery temperature in each battery box, through the control of the cooling fan to prevent the battery temperature is too high.
Equalization control: due to the difference of battery individual and the different use state, the inconsistency of battery in the process of use will become more and more serious, and the system should be able to judge and deal with the equalization automatically.
Fault diagnosis: the working voltage of electric vehicle battery is generally high (90 V-700V), the system should monitor the power supply short circuit, leakage and other possible harm to the person and equipment.
Battery condition prediction and alarm: through the collection of battery parameters, the system has the functions of predicting the performance of single cell, fault diagnosis and early alarm in the battery pack, so as to maintain and replace the battery to ensure safety.
Information monitoring: the main information of the battery is displayed in real time at the vehicle display terminal.
parameter calibration: because the battery type and quantity used in different models, the capacity and quantity of each battery box are different, so the system should have the function of calibrating the information such as model, vehicle number, battery type and battery mode.
