Introduction to Lithium Battery Maintenance Board and Operating Principle

The lithium battery maintenance board is the maintenance of the charging and discharging of the lithium battery pack in series; it can ensure that the voltage difference between the individual cells is less than the set value (generally ±20mV) during the overflow, and complete the equal charge of the individual cells of the battery pack , Effectively improve the charging application under the series charging method; at the same time, test the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single battery in the battery pack to maintain and extend the battery life; undervoltage maintenance makes every A single-cell battery is used when the battery is discharged, and the battery is damaged due to over-discharge. The operating principle of the lithium battery maintenance board 1. Overcharge maintenance and overcharge maintenance recovery When the battery is charged and the voltage exceeds the set value VC (4.25-4.35V, the specific overcharge maintenance voltage depends on the IC), VD1 flips to change Cout At low level, T1 is cut off and charging stops. When the battery voltage drops to VCR (3.8-4.1V, the specific overcharge maintenance and recovery voltage depends on the IC), Cout becomes high, T1 is turned on and charging continues, VCR must be lower than VC by a fixed value to prevent frequent jumps change. 2. Over-discharge maintenance and over-discharge maintenance recovery When the battery voltage drops to the set value VD (2.3-2.5V, the specific over-charge maintenance voltage depends on the IC) due to discharge, VD2 reverses, and after a short time delay, Dout becomes low level, T2 ends, and the discharge stops. When the battery is charged, the internal OR gate is flipped and T2 is turned on again to prepare for the next discharge. 3. Over-current and short-circuit maintenance. When the charging and discharging loop current of the circuit exceeds the set value or is short-circuited, the short-circuit test circuit will act to turn off the MOS tube and the current is cut off. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.