Parallel battery pack two-way lossless equalization circuit based on inductance energy storage

Abstract

The invention discloses a parallel battery pack two-way lossless equalization circuit based on inductance energy storage. Parallel battery packs comprise a left battery pack and a right battery pack. The beginning and the end of the parallel battery packs are between VCC and GND. Left and right battery packs are connected through an intermediate equalization circuit. The equalization circuit is connected with a control circuit. If the power of a number of batteries in left and right battery packs is not balanced, by controlling on-off of a TRIAC in the equalization circuit and the energy storage function of an energy storage inductor, power can be transferred to batteries in the other battery pack, and energy can be acquired from the other battery pack. According to the circuit, dynamic balance in charging and discharging processes of the battery packs can be realized; the unbalanced phenomenon of the battery packs is improved; the available capacity of the battery packs is improved; repair and replacement cycles of the battery packs are reduced; the service lives of the battery packs are extended; and the circuit is suitable for the battery management system of an energy storage device in a hybrid vehicle, a pure electric vehicle or an energy storage power station.

Description

technical field [0001] The invention relates to the technical field of equalization of battery packs, in particular to a bidirectional non-destructive equalization circuit of parallel battery packs based on inductive energy storage. Background technique [0002] After the battery pack has gone through multiple charge and discharge cycles, there are roughly three situations in the distribution of the remaining capacity of each battery cell: the remaining capacity of some battery cells is high; the remaining capacity of some battery cells is low; The remaining capacity of some battery cells is high and the remaining capacity of some battery cells is low. In view of the above three situations, domestic and foreign scholars have put forward their own solutions. For example, in response to the high remaining capacity of individual battery cells, some researchers have proposed a parallel resistor shunt method, which consumes the energy of the battery module with a high remaining ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned defects in the prior art, and to provide a bidirectional non-destructive equalization circuit for parallel battery packs based on inductive energy storage. The monomers in the battery do not appear overcharge and overdischarge during the charging and discharging process, improve the unbalanced phenomenon of the battery pack, increase the available capacity of the battery pack, reduce the maintenance and replacement cycle of the battery pack, and prolong the service life of the battery pack. Reduce operating costs for hybrid electric vehicles, electric vehicles and energy storage plants

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