Lithium battery group used, the lithium-ion battery required charging voltage, discharge under voltage, over current and short circuit protection to achieve the balance of the entire set of batteries during charging charging problems, introduced a single lithium-ion battery protection circuit to protect the group any number of series lithium-ion battery balancing charger battery pack protection board design. Simulation results and industrial production showed that the Protection Board protection function, stable, cost-effective, equalization error less than 50mV.

Equalization techniques commonly used include constant shunt resistor equalization charging, switching shunt resistor equalizing charge, average battery voltage equalization, switched-capacitor balance charging and equalizing charge a buck converter, inductance equalization charging. Group when charging the lithium-ion batteries in series, each battery charge equalization should be guaranteed, otherwise the process will affect battery performance and life of the whole group. Existing single lithium-ion battery protection circuit do not include equalization control, lithium-ion battery protection circuit equalization control function require external CPU through and protect chip serial communication (I2C bus) to achieve, increases the complexity of the protection circuit and design difficulties, reducing the efficiency and reliability of the system, increase the power consumption.

Lithium battery group used, the lithium-ion battery required charging voltage, discharge under voltage, over current and short circuit protection to achieve the balance of the entire set of batteries during charging charging problems, introduced a single lithium-ion battery protection circuit to protect the group any number of series lithium-ion battery balancing charger battery pack protection board design. Simulation results and industrial production showed that the Protection Board protection function, stable, cost-effective, equalization error less than 50mV.

Lithium battery protection board balanced charging structure

Single lithium-ion battery protection circuit number according to the number of lithium-ion battery determines, in series respectively corresponds to a single lithium battery charging and discharging, overcurrent and short circuit protection. While in charge of the system protection by protecting the chip control shunt-discharge branch and off balance charging, which is different from traditional balanced charging on the charger side approach, lowering the cost of lithium-ion battery pack charger design.