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With the global energy transition and the rapid development of renewable energy, the application of energy storage BMS is becoming more and more widespread. Energy storage BMS is an important part of battery energy storage system design.
BMS is short for Battery Management System, which refers to the sub-system used to manage the battery energy storage system, including the monitoring of parameters such as battery charging, discharging, voltage, etc., SOC (State of Charge), SOH (State of Health) estimation, and protection measures.
Its main functions are as follows:
1、Monitoring and controlling the state of the battery
The energy storage BMS can monitor battery parameters such as voltage, current, temperature, SOC and SOH, and other information about the battery.
2、SOC (State of Charge) equalisation
During the use of battery packs, there is often an imbalance in the SOC of the batteries, which reduces the performance of the battery pack or even leads to battery failure. Energy storage BMS can solve this problem through the battery equalisation technology, that is, by controlling the discharge and charging between the batteries, so that the SOC of all the battery units to maintain the same. Equalisation depends on whether the energy of the battery is dissipated or transferred between batteries, and can be divided into two modes: passive equalisation and active equalisation.
3、To prevent overcharging or over-discharging the battery
Overcharging or overdischarging of batteries is a problem that can easily occur in battery packs, and both too much and too little charging and discharging can cause damage to the battery pack components. Over-discharging and over-charging of the battery may lead to a reduction in the capacity of the battery component, or even make it unusable. Therefore, the energy storage BMS is used to control the battery voltage during battery charging to ensure the real-time status of the battery and to stop charging when the battery reaches its maximum capacity.
4. Ensure remote monitoring and alarm of the system
The energy storage BMS can transmit data via wireless network and other means to send real-time data to the monitoring end, while fault detection and alarm messages can be sent periodically according to the system settings. The energy storage BMS also supports flexible reporting and analysis tools that can generate historical data and event records of the battery and system to support data monitoring and fault diagnosis.
5、Provide a variety of protection functions
The energy storage BMS can provide a variety of protection functions to prevent problems such as battery short-circuit and over-current, and to ensure safe communication between battery components. At the same time, it can also detect and handle accidents such as unit failure and single point failure.
6、Control the temperature of the battery
The temperature of the battery is one of the important factors affecting the performance and life of the battery. The energy storage BMS can monitor the battery temperature and take effective measures to control the battery temperature to prevent damage to the battery caused by too high or too low temperature.
In short, an energy storage BMS can provide comprehensive monitoring and control of battery storage systems to ensure their safety, stability, and performance, thereby achieving the best possible results for the energy storage system. In addition, an energy storage BMS can improve the service life and reliability of an energy storage system, reduce maintenance costs and operational risks, and provide a more flexible and reliable energy storage solution.