521133 lipo battery.Analysis of the balanced charging principle of lithium-ion battery pack protection board

Balanced charging principle of lithium battery pack protection board The number of single-cell lithium battery protection chips is determined according to the number of cells in the lithium battery pack, and they are used in series to protect the corresponding single-cell lithium battery from the charge and discharge, overcurrent, and short-circuit conditions. The department

Balanced charging principle of lithium-ion battery pack protection board


The number of single-cell lithium-ion battery protection chips is determined according to the number of cells in the lithium-ion battery pack, and they are used in series to protect the corresponding single-cell lithium-ion battery from the charge and discharge, overcurrent, and short-circuit conditions. While charging protection, the system uses the protection chip to control the on and off of the shunt discharge branch switch device to achieve balanced charging. This method is different from the traditional method of achieving balanced charging at the charger end and reduces the cost of the lithium-ion battery pack charger. Cost of design usage.


Lithium-ion battery packs are composed of multiple single-cell lithium-ion batteries connected in series. Due to the differences in the cells, inconsistent rise in terminal voltage during series charging will cause some cells to be overcharged and some cells to be undercharged. All batteries are connected in parallel during equalizing charging and in series during normal charging and power use. During balanced charging, the parallel voltages of all batteries are equal, achieving forced balancing of each battery.