Lithium battery and zinc-bromine flow battery hybrid energy storage management system

Abstract

The invention discloses a lithium battery and zinc-bromine flow battery hybrid energy storage management system. The management system is characterized in that five electric piles of a zinc-bromine flow battery are connected in series and then connected to a low-voltage terminal of a DC / DC converter, and the DC / DC converter is subjected to isolating voltage boosting and then divided into 16 paths to be output to a direct-current bus (DC Bus) in parallel; a lithium battery is divided into four paths of converters and then connected to the low-voltage terminal of the DC / DC converter to be converged with the zinc-bromine flow battery on the DC Bus, unified output is achieved, and a direct-current output port is formed and directly connected with a direct-current terminal of a PCS. The lithium battery and zinc-bromine flow battery hybrid energy storage management system has the advantages that the defect of single battery application in a traditional micro-grid system is overcome, the technical problem that the lithium battery cannot achieve long-time deep discharge is solved, the problem that the flow battery cannot achieve rapid rate discharge is solved, the application scale and application prospect of stored energy in future micro-grids and smart power grids are greatly extended, and a higher popularization value is achieved.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of lithium batteries and zinc-bromine flow batteries, in particular to a hybrid energy storage management system of lithium batteries and zinc-bromine flow batteries. Background technique [0002] Lithium battery is an excellent power battery with high charge and discharge efficiency and high rate discharge, etc. However, in the application of large-capacity electric energy storage, since a large-capacity lithium battery is composed of multiple single cells, when the capacity is large enough to a certain extent , when the number of single cells reaches a certain number, the problem of consistency between cells becomes prominent. At the same time, lithium batteries have strict requirements on charging and discharging. Overcharging or overdischarging will cause the battery to catch fire and explode. Especially in large-capacity applications, when a large number of batteries are connected in ...

AI Technical Summary

Problems solved by technology

However, the energy efficiency of the zinc-bromine flow energy storage battery is only 70%, which is lower than that of the sodium-sulfur battery and lithium battery; the zinc-bromine battery system needs fifteen minutes of start-up time for the electrolyte circulation system to be activated for the first time. pre-run

The zinc-bromine battery system is an energy type battery with a maximum discharge rate of 0.5C, which does not have the advantage of power battery energy rate discharge

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