The battery management system (BMS) is mainly designed to improve the utilization of batteries, prevent overcharging and over-discharging, extend battery life, and monitor the status of batteries.
In electric vehicles, the battery management system plays a vital role in monitoring real-time power battery parameters, performing critical functions such as SOC estimation, fault diagnosis, estimated cruising range, leakage monitoring, and charge and discharge mode selection. It also interacts with the vehicle controller or charger through the CAN bus, ensuring the efficient and safe operation of electric vehicles while promoting reliability. A top-tier battery management system supplier can deliver top-of-the-line products and services, which ensure optimal battery performance, enhance the overall driving experience, and promote long-lasting battery life. Thus, with cutting-edge technology and expertise in battery management systems, electric vehicles can achieve seamless performance, high efficiency, and optimum safety levels.
Real-time collection of battery system operating status parameters
Real-time collection of end voltage and temperature, charge and discharge current, and total voltage of each battery in the electric vehicle battery pack. Because the performance and status of each battery in the battery pack are inconsistent during use, the voltage, current, and temperature data of each battery must be monitored by using a battery condition monitoring system.
Determine the SOC value of the battery
Accurately estimate the SOC value of the power battery pack, so as to predict how much energy is left in the electric vehicle energy-storage battery at any time or the SOC value of the energy-storage battery, and control the SOC value of the battery within the working range of 30% to 70%.
Fault diagnosis and alarm
When the battery pack needs to be charged due to low battery level or energy, an alarm should be generated in time to prevent the battery from over-discharging and damaging its service life. When the temperature of the battery pack is too high and abnormal operation occurs, an alarm should be generated in time to ensure normal operation of the battery pack.
Thermal balance management of the battery pack
The battery thermal management system is an organic part of the BMS, which functions to keep the battery temperature within the normal working temperature range through fan cooling systems and thermal resistance heating devices.
Consistency compensation
When there is a difference between batteries, certain measures should be taken to compensate so that the battery pack has stronger performance, and there are certain means to display the position of poorly performing batteries for repair and replacement. Generally, charging compensation function is adopted. The design has a bypass shunt circuit to ensure that each cell can be fully charged, which can slow down the aging process of the battery and extend its service life.
Communication between each detection module and central processing unit through the bus
The difficulty and key of battery management on electric vehicles lies in how to establish a relatively accurate mathematical model to determine the remaining energy of each battery based on the historical data of voltage, temperature, and charge and discharge current of each battery. That is, to accurately estimate the SOC value of the electric vehicle battery.
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