The lithium-ion battery protection board is the charge and discharge protection for the series-connected lithium-ion battery pack; when fully charged, it can ensure that the voltage difference between the individual cells is less than the set value, and realize the equal charge of the individual cells of the lithium-ion battery pack. Effectively improve the charging effect in the series charging mode; at the same time, detect the overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of each single cell in the battery pack to protect and extend the battery life; undervoltage protection makes each The single-cell battery prevents the battery from being damaged due to over-discharge when it is discharged.
Balanced charging technologies commonly used in the balance principle of lithium-ion battery protection boards include constant shunt resistance balance charging, on-off shunt resistance balance charging, average battery voltage balance charging, switched capacitor balance charging, step-down converter balance charging, inductance balance charging, etc.
When a group of lithium-ion batteries are charged in series, it should be ensured that each battery is charged equally, otherwise the performance and life of the entire group of lithium iron phosphate batteries will be affected during use. However, the existing single-cell lithium-ion battery protection chips do not contain the balanced charging control function, and the balanced charging control function of the multi-cell lithium-ion battery protection chip requires an external CPU; it is realized through serial communication with the protection chip, and the protection circuit is increased. The complexity and design difficulty of the system reduce the efficiency and reliability of the system, and increase the power consumption.
The balance principle of lithium-ion battery protection board According to the needs of the application, after changing the type of protection chip and the number of series connections, the power level of switching devices and energy-consuming components in the circuit, it can protect and protect power lithium-ion battery packs of any structure and voltage level. Equal charge.
