Active equalizer circuit of cell pack

Abstract

The invention relates to an active equalizer circuit of a cell pack. The active equalizer circuit comprises an input / output reversible DC / DC (Direct-Current / Direct-Current) converter and a switch array, wherein the switch array is composed of a group of positive switches and a group of negative switches, wherein one ends of the positive switches are used for being connected with the positive electrodes of the monomer cells respectively; one ends of the negative switches are used for being connected with the negative electrodes of the monomer cells respectively; the other end of each positive switch is connected with the positive electrode (V2+) of the first direct current junction terminal of the DC / DC converter; the other end of each negative switch is connected with the negative electrode (V2-) of the first direct current junction terminal of the DC / DC converter; the DC / DC converter further comprises second direct current junction terminals (V1+ and V1-); and a control switch (S13) is serially arranged in a loop formed by connecting the second direct current junction terminals (V1+ and V1-) with the positive electrodes and the negative electrodes of the cell pack. The active equalizer circuit has the main function that both the charge equalization of the cell pack is realized, and the discharge equalization of the cell pack is realized.

Description

technical field [0001] The invention relates to an active equalization circuit for a battery pack, in particular to an active equalization circuit for a power lithium battery pack with multiple cells connected in series. Background technique [0002] Lithium-ion batteries, especially lithium-ion power batteries, are becoming more and more widely used and have become an important direction for the development of new energy technologies. The larger the capacity of the single battery, the greater the difference in capacity of the single battery. There are two types of inconsistencies in the use of large-capacity lithium-ion batteries in groups. The first type of inconsistency is caused by differences in actual capacity, and the second type of inconsistency is caused by differences in initial power. Due to the inconsistency, one cell will be full first during charging, and another cell will be empty first during discharging. These defects limit the charge and discharge capacity...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a battery pack active equalization circuit with a simple circuit to solve the problems of complex structure and high control requirements of the existing active equalization circuit

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