The reason why the lithium battery of electric bicycle has a charge equalization function is mainly because the lithium ion battery has the advantages of small size, high energy density, no memory effect, high cycle life, and low self-discharge rate.

　　The reason why the lithium battery of electric bicycle has a charge equalization function is mainly because the lithium ion battery has the advantages of small size, high energy density, no memory effect, high cycle life, and low self-discharge rate.

　　1. The matching of the battery or the influence of the external environment, resulting in a difference in the battery voltage of each battery in the battery pack,

　　2. When the battery voltage difference between each group in series exceeds the set value, the equalization circuit is allowed to work, the equalization starts during the charging process, and the equalization resistor discharges the battery group with the highest relative capacity;

　　3. The equalization current is the equalization absorption current value to reduce the voltage rise speed of the battery pack. When the voltage difference of the series batteries is less than the set value, the equalization circuit is prohibited from working without any equalization.

　　When charging and discharging a group of lithium batteries for electric bicycles, taking into account the inconsistency of each single battery, balancing measures can be taken to ensure safety and stability. This article mainly analyzes the importance of equalization processing, its implementation method, and its relationship with protection processing.