With the acceleration of the process of information society, various electronic devices are used more and more widely in people's work and life. All kinds of electrical equipment can not be separated from a reliable power supply, especially important equipment such as communication systems, power control systems, as the final power supply system, the battery plays a pivotal role in which, but the battery is one of the weakest links, the most prone to failure, the proportion of failures in the power supply device is relatively large. During the operation of a battery pack, some batteries may quickly fail due to drying up, heating, leakage, undercharge, overdischarge, and increased internal resistance, resulting in abnormal operation of the system or power supply equipment or major accidents. Practice has proved that the failure of the battery is often caused by the failure of one or several batteries. Therefore, on-line battery monitor of operating parameters is very important to ensure the reliability of power supply.

At present, there are many defects in traditional inspection and maintenance methods, such as: poor accuracy of manual measurement, easy to be affected by human factors, poor real-time and continuity. Therefore, the traditional detection and maintenance means not only lack the source of information, but also lack of professional comprehensive analysis means, resulting in the failure and hidden dangers can not be found in time, which brings serious threats to production and safety. The development of battery online monitoring technology makes it the best assistant for daily maintenance, which not only has the monitoring function, but also can achieve comprehensive analysis, intelligent management, automatic alarm and network monitoring and other advanced functions, it can be seen that the use of battery online monitoring system instead of manual detection has become an inevitable trend.

Why is BMS important?

BMS is not only important in showing the health of the battery, but also in protecting the battery during operation.

Each battery unit and chemical composition has voltage, temperature and current ranges within which it can operate safely. When a battery falls below or exceeds these ranges, it can be detected and controlled by the BMS. Lithium, for example, is a highly reactive substance; Therefore, the BMS should monitor each lithium cell to ensure that it is operating within predetermined limits. This keeps the battery safe and preserves it in the long term.

Another important safety feature of BMS is battery balance. The individual cells in a battery pack do not operate equally. One battery may be weaker or stronger than another, charging or discharging faster than other batteries in the battery chain. Without proper compensation, this can reduce the health of the entire battery pack. If one battery shorts out or fails, this will affect the stability of the entire battery pack. Battery balance Balances the charge between individual cells according to the capacity of each cell. The BMS helps to monitor and control the charge required for each cell in the chain, ensuring that the SoC remains evenly distributed.

The role of BMS in battery testing

BMS plays a key role in battery pack testing to monitor the status of each individual cell and its operation with the entire battery pack. It can help detect faults and weaknesses in the battery pack, as well as better monitor changes in current, voltage, temperature, and other parameters throughout the test. SoC and SoH are important metrics in testing to see how the battery performs over the entire charge/discharge cycle. Good battery testing software will be able to communicate these statistics with external interfaces, giving researchers a good idea of how the battery pack is functioning.