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Commonly used equalization charging techniques include constant shunt resistance equalization charging, on-off shunt resistance equalization charging, average battery voltage equalizing charging, switched capacitor equalizing charging, buck converter equalizing charging, and inductor balanced charging. When a group of lithium batteries are charged in series, it is necessary to ensure that each battery is evenly charged, otherwise the performance and life of the entire battery will be affected during use. The existing single-cell lithium battery protection chips do not include the equalization charge control function, multi-cell lithium battery protection chip balance charge control function requires an external CPU; through the serial communication with the protection chip (such as I2C bus) to achieve, increase The complexity and design difficulty of the protection circuit reduce the efficiency and reliability of the system and increase the power consumption.
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