Intelligent lithium battery is in the development process of lithium battery because a single battery cell cannot meet the requirements of most portable electronic devices. It needs to be connected in series and in parallel to form a battery pack, mainly in the capacity and voltage of the battery. And discharge requirements can meet certain requirements of electronic equipment, but because there are certain numerical errors between lithium batteries in terms of capacity, voltage, internal resistance, etc., that is, the size is different, so the stability of the battery core will malfunction. Prone to failure, in order to improve the working stability between the cells, the battery management system bms came into being, and the tolerance, pressure difference, internal resistance difference and other aspects between the cells in the smart lithium battery were carried out. Coordination to maximize the working efficiency of the battery pack and extend the working life of the battery.
Smart lithium battery
In simple terms, the structure of a smart lithium battery is mainly divided into a lithium battery cell, a battery protection board (bms), a battery fixing bracket and a wire.
Smart lithium battery is a collective term, because the type of lithium battery used and the battery brand are different, the quality will be different, and the price will also vary greatly. This is the main reason why the prices of smart lithium batteries we see in the market are different. . There are many types of batteries used as smart lithium batteries. According to the type, there are mainly polymer lithium batteries, lithium iron phosphate batteries, lithium cobalt oxide batteries, high nickel lithium batteries, ternary lithium batteries, etc. According to similar batteries In terms of attributes, the same kind of batteries can be divided into low temperature batteries, high rate discharge batteries, wide temperature batteries and conventional discharge batteries.
The functions of the smart lithium battery mainly depend on the functions of the selected battery protection board (bms), so what functions does the smart lithium battery include?
Functions included in lithium batteries:
1) The energy storage lithium battery BMS has an analog measurement function: it can measure cell voltage and temperature in real time, and measure battery terminal voltage, current and other parameters. Ensure the safe, reliable and stable operation of the battery, ensure the service life of the single battery, and meet the optimization control requirements for the operation of the single battery and battery pack.
2) Energy storage lithium battery BMS has online SOC diagnosis: based on real-time data collection, an expert mathematical analysis and diagnosis model is established to measure the battery's remaining power SOC online. At the same time, it intelligently corrects the SOC prediction based on the battery's discharge current and ambient temperature, and provides a more consistent battery remaining capacity and reliable use time under changing loads.
3) Battery system operation alarm function: when the battery system is running over voltage, under voltage, over current, high temperature, low temperature, abnormal communication, abnormal BMS, etc., it can display and report alarm information.
4) Battery system protection function: through the high-voltage control unit for abnormal battery faults such as serious overvoltage, undervoltage, and overcurrent (short circuit) that may occur during operation.
5) The energy storage lithium battery BMS has a communication function: the system can communicate with PCS via CAN, the communication protocol supports the Ankerui PCS communication protocol, and the background uses RS485 for communication, and the communication protocol is the standard Modbus protocol.
6) Thermal management function: Strictly monitor the operating temperature of the battery pack. If the temperature is higher or lower than the protection value, the battery management system will automatically cut off the battery circuit to ensure system safety.
7) Energy storage lithium battery BMS has self-diagnosis and fault tolerance functions:
8) Balance function: passive balance, the maximum balance current is 200mA.
9) Operation parameter setting function;
10) Local operating status display function;
11) Energy storage lithium battery BMS has event and log data recording functions:
