What are the equalizing charging methods for lithium battery packs?

Lithium battery pack equalization charging method. When the lithium battery pack has been processed and stored for a long time, due to the different static power consumption of each circuit of the protection board and the different self-discharge rate of each cell, the voltage of each string of the entire battery pack is inconsistent . Equalization has the function of equalizing the voltage of the lithium battery pack, so as to achieve the effect of full charge and full discharge of the battery pack capacity, so that the battery pack can exert the maximum effect. Commonly used lithium battery pack equalization charging technologies include constant shunt resistance equalization charging, on-off shunt resistance equalization charging, average battery voltage equalization charging, switched capacitor equalization charging, step-down converter equalization charging, inductance equalization charging, etc. When charging a group of lithium batteries in series, ensure that each battery is charged in a balanced manner, otherwise the performance and life of the entire group of batteries will be affected during use. 1. Attach a parallel equalization circuit to each single cell of the lithium battery pack to achieve the purpose of shunting. In this mode, when a battery reaches full charge first, the equalization device can prevent it from overcharging and convert the excess energy into heat energy, and continue to charge the undercharged battery. This method is simple, but it will cause energy loss and is not suitable for fast charging systems. 2. Before charging, each monomer is discharged to the same level through the same load one by one, and then constant current charging is performed to ensure a more accurate equilibrium state between the individual monomers. However, for battery packs, due to physical differences between individuals, it is difficult to achieve a completely consistent ideal effect after deep discharge of each cell. Even if the same effect is achieved after discharging, a new imbalance will appear during the charging process. 3. The single cells in the lithium battery pack are tested and charged uniformly on time, in sequence, and individually. When charging the lithium battery pack, it can be ensured that each lithium battery in the battery pack will not be overcharged or overdischarged, thus ensuring that each battery in the lithium battery pack is in a normal working state. 4. Using the time-sharing principle, through the control and switching of the switch components, the extra current flows into the battery with a relatively low voltage to achieve the purpose of balanced charging. This method is more efficient, but the control is more complicated. 5. Take the voltage parameters of each battery as the object of balance to restore the same voltage of each battery. During equalizing charging, the capacitor is alternately connected to two adjacent batteries through the control switch, accepts the charging of the high-voltage battery, and then discharges to the low-voltage battery until the voltages of the two batteries tend to be the same. This kind of equalization method better solves the problem of battery pack voltage imbalance, but this method is mainly used in occasions with a small number of batteries. Disclaimer: Some pictures and contents of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to distinguish the consistency of the lithium battery pack?