Power lithium batteries used in groups, all sections of the lithium batteries are required to charge over-voltage, under-voltage discharge, over-current, short circuit protection, the charging process to achieve the entire group of battery charge balanced, introduced a single lithium battery Protection chip for any series number of lithium batteries to protect the balanced charging function of the battery pack protection board design.The simulation results and industrial production applications show that the protection board protection features perfect, stable, cost-effective, balanced charging The error is less than 50mV.
Commonly used balanced charging techniques include constant shunt resistor balanced charging, on-off shunt resistor balanced charging, average battery voltage equalizing charge, balanced switching capacitor, step-down converter balanced charging, balanced inductor charging, etc. A series of lithium batteries are charged in series , Should ensure that each cell balanced charge, otherwise the process will affect the performance and life of the entire battery while the existing single-cell lithium battery protection chip does not contain balanced charge control, multi-cell lithium battery protection chip balanced charging The control function requires an external CPU. By implementing serial communication with the protection chip (such as I2C bus), the complexity and design difficulty of the protection circuit are increased, the efficiency and reliability of the system are reduced, and the power consumption is increased.
Power lithium batteries used in groups, all sections of the lithium batteries are required to charge over-voltage, under-voltage discharge, over-current, short circuit protection, the charging process to achieve the entire group of battery charge balanced, introduced a single lithium battery Protection chip for any series number of lithium batteries to protect the balanced charging function of the battery pack protection board design.The simulation results and industrial production applications show that the protection board protection features perfect, stable, cost-effective, balanced charging The error is less than 50mV.
Lithium battery protection board balanced charging principle structure
The number of single-cell lithium battery protection chips is determined according to the number of lithium battery packs and used in series, respectively, to protect the single-cell lithium battery from charging, discharging, overcurrent and short circuit conditions. The system protects the battery while protecting the chip The tributary discharge tributary switching device turns on and off to achieve balanced charging. This solution is different from the traditional method of achieving balanced charging on the charger side, which reduces the cost of lithium-ion battery charger design and application.
