Multistage equilibrium control system and method of liquid metal battery packs

Abstract

The invention discloses a multistage equilibrium control system of liquid metal battery packs. The multistage equilibrium control system comprises N first stage passive equilibrium control systems and a second stage active equilibrium control system; the N first stage passive equilibrium control systems are connected in series, and the N first stage passive equilibrium control systems and the second stage active equilibrium control system are simultaneously used for state monitoring and equilibrium control of battery packs; each of the first stage passive equilibrium control systems comprises a battery pack composed of X liquid metal battery monomers in series connection, a data acquisition module, a passive equalization circuit module, and a passive equilibrium controlling center; the second stage active equilibrium control system comprises N liquid metal battery units in series connection, an active equalization circuit module, and an active equilibrium controlling center. Passive equilibrium controlling and active equilibrium controlling are adopted in the multistage equilibrium control system and a multistage equilibrium control method so as to solve technical problems in conventional liquid metal battery pack equilibrium control systems that speed is low, efficiency is low, active equilibrium controlling is difficult to realize and equilibrium controlling devices are complex because of low voltage platform.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a multi-level balance control system and method for a liquid metal battery. Background technique [0002] Liquid metal battery is a new type of energy storage battery, which has broad application prospects in the field of large-scale energy storage due to its advantages of large capacity, long life, and low cost. In order to build a large-scale energy storage system, liquid metal batteries must be connected in series and parallel to meet the requirements of voltage and capacity levels. During use, due to differences in the manufacturing process, aging speed, and use environment of single batteries, the consistency between batteries will gradually decrease, which will seriously shorten the service life and capacity utilization of the battery pack. A corresponding balance control is essential. [0003] At present, domestic research on the equilibrium ...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-level balance control system and method for liquid metal batteries, the purpose of which is to simultaneously adopt the multi-level balance control system and method of passive balance control and active balance control, And by using a battery pack composed of several liquid metal batteries with high consistency in series as the battery unit for active equalization control, the voltage of the active equalization unit is increased, thereby solving the problem of slow speed and low efficiency of the existing liquid metal battery pack equalization control system. Low and due to its low voltage platform, it is difficult to implement active equalization and the technical problems of complex equalization control devices

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