Lithium Battery Pack Protection Board Balanced Charging Design

- Nov 24, 2016 -

Commonly used balanced charge technology includes constant shunt resistor balanced charge, on-off shunt resistor balanced charge, the average battery voltage balanced charge, switching capacitor balanced charge, buck converter balanced charge, inductive equalization charge. Groups of lithium batteries in series charging, should ensure that each cell balanced charge, otherwise the use of the process will affect the performance of the entire group of batteries and life. And the existing single-cell lithium battery protection chip does not contain balanced charge control function, multi-cell lithium battery protection chip balance charge control function requires an external CPU; and chip protection through serial communication (such as I2C bus) to achieve, increase The complexity of the protection circuit and design difficulty, reducing the efficiency and reliability of the system, an increase of power consumption.

Power lithium battery in groups, each section of lithium batteries are required to charge over voltage, discharge under voltage, over current, short circuit protection, charging process to achieve the entire group of balanced battery charging problem, introduced a single lithium battery Protection chip on any number of groups of lithium batteries in series to protect the balance of the battery pack with the function of the protection board design. Simulation results and industrial applications show that the protection board protection function, stable, cost-effective, balanced charging error of less than 50mV.

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