Two-way nondestructive equalization circuit of parallel battery packs based on capacitive energy storage

Abstract

The invention discloses a two-way nondestructive equalization circuit of parallel battery packs based on capacitive energy storage. The parallel battery packs consist of a left battery pack and a right battery pack. The head and tail ends of the parallel battery packs are between VCC and GND, the left battery pack and the right battery pack are connected by an equalization circuit in the middle, and the equalization circuit is further connected with a control circuit. If there is power imbalance between the batteries in the left and right battery packs, by controlling on-off of a triode AC semiconductor switch TRIAC and the energy storage function of an energy storage capacitor in the equalization circuit, the power of one battery pack can be transferred to the batteries in the other battery pack, and one battery pack can get energy from the other battery pack. Through the circuit, dynamic equalization in the process of charge and discharge of battery packs is realized, the phenomenon of battery pack imbalance is improved, the available capacity of battery packs is improved, the maintenance and replacement cycle of battery packs is reduced, and the service life of battery packs is extended. Therefore, the circuit is applicable to the battery management system of an energy storage device in a hybrid vehicle, a pure electric vehicle or a pumped 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 capacitor 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. [0003] 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 r...

AI Technical Summary

Problems solved by technology

[0005] 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 capacitor 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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