Introduction to lithium ion battery pack protective plate equalization charging method

　　Author ：Iflowpower – Portable Power Station Supplier

Commonly used lithium-ion battery pack equalization charging technology includes constant shunt resistance equalization, power-off shunt resistance equalization, uniform battery voltage equalization charging, switch capacitance equalization charging, step-down converter equalization charging, inductance equalization charging, etc. When the lithium-ion battery in groups can rent a series charge, it should ensure that each battery is balanced, otherwise it will affect the performance and life of the whole set of batteries during use. 1.

Add a parallel unbalanced circuit on each unit cell of the lithium ion battery pack to achieve the purpose of delivering. In this mode, when a battery is fully charged, the equalization device prevents its over charge and converts excess energy into thermal energy, and continues to charge the unfilired battery. This method is simple, but it will bring energy loss, not suitable for fast charge system.

2, in front of charging, each single is discharged from the same level one by one, and then constant flow charging, so as to ensure a relatively accurate equalization state between each monomer. However, the battery pack is difficult to achieve exactly consistent ideal effects after the depth discharge of individual monomers due to physical differences between individuals. Even if the same effect is reached after discharge, there will be a new imbalance in the charging process.

3, on time, order, test and an average charging of the monomer battery in the lithium ion battery pack separately. When charging the lithium ion battery pack, it is possible to ensure that each of the lithium ion batteries in the battery pack does not overcharge or over-discharge, and thus each of the cells in the lithium ion battery pack is in normal operation. condition.

4, use the time-time principle, through the control and switching of the switching assembly, make the additional current flow into the battery to achieve a balanced charging. This method is relatively efficient, but the control is more complicated. 5.

The voltage parameters of each battery are equalized to make the voltage recovery of each battery. When equilibrium charging, the capacitor is connected to the adjacent two battery through the control switch, and the charging of the high voltage battery is received, and the low voltage battery is discharged until the voltage of the two batteries tends to be consistent. This kind of balanced approach handles the problem of battery pack voltage imbalance, but this method is tightly used in the case where the number of batteries is small.

6, the entire system is controlled by the single-chip microcomputer, the monomer battery has a separate set of modules. The module is based on the setup program, and the unit cells are charged separately, and the charging is automatically disconnected. This method is relatively simple, but the cost will increase the cost in the monomer battery, which is not conducive to the decrease in system volume.