Active equalization system of lithium-ion power battery and equalization method thereof

Abstract

The invention relates to an active equalization system of a lithium-ion power battery. The active equalization system comprises a battery module B formed by connecting a plurality of single batteries in series, a primary coil L of a transformer T is connected with the anode and cathode of the battery module B via a master switch S, each secondary coil of the transformer T is respectively connected to the anode and cathode of each single battery via each sub switch, the master switch S is bridged between the signal input terminal of the main control chip MCU and the earth terminal, a sampling processing circuit is connected between the signal input terminal of the main control chip MCU and the master switch S. The invention also discloses an equalization method for the active equalization system of the lithium-ion power battery. In the invention, the process of mutually charging and discharging by converting electric energy to magnetic energy and then to electric energy is completed by using inductive effect, thus realizing the function of equalizing the upper limit or lower limit of the electric quantity of the single batteries, prolonging the service life of the storage batteries, needing no cooling system and having simple structure.

Description

technical field [0001] The invention relates to an automobile battery equalization technology, in particular to an active equalization system and an equalization method for a lithium-ion power battery. Background technique [0002] Most power batteries are connected in series. Since the manufacturing, initial capacity, voltage, internal resistance, and temperature of each single battery in the battery pack are not exactly the same for each single battery, during use, a single battery will be damaged. The overcharging and overdischarging of the storage battery will cause the capacity of some storage batteries to be lower than other storage batteries in severe cases. During the discharge process, its power will be discharged first. At this time, it becomes an electrical appliance, and the remaining batteries that still have capacity are connected in series to charge it, and the reverse polarity of the battery occurs, which makes the entire battery pack unable to work normally,...

AI Technical Summary

Problems solved by technology

[0002] Most power batteries are connected in series. Since the manufacturing, initial capacity, voltage, internal resistance, and temperature of each single battery in the battery pack are not exactly the same for each single battery, during use, a single battery will be damaged. The overcharging and overdischarging of the storage battery will cause the capacity of some storage batteries to be lower than other storage batteries in severe cases. During the discharge process, its power will be discharged first. At this time, it becomes an electrical appliance, and the remaining batteries that still have capacity are connected in series to charge it, and the reverse polarity of the battery occurs, which makes the entire battery pack unable to work normally, and at the same time causes a great impact on the life of the battery with reverse polarity. influences

[0003] During the charging process, the battery that is discharged first will be fully charged first, so that overcharging will occur, so that the entire battery pack cannot be fully charged normally.

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