A group balance control device and control method for energy storage liquid metal batteries

Abstract

The invention belongs to the field of electrochemical energy storage and particularly relates to a group balanced control device and method for an energy-storage liquid metal battery. The group balanced control device for the energy-storage liquid metal battery comprises N serially connected liquid metal battery units, a voltage detection module, a balanced control module and a balanced circuit module; multiple liquid metal battery monomers with higher consistency are screened and are firstly connected in series and later connected in parallel to form one battery unit, and the battery units are placed in the same high-temperature incubator. The invention further discloses a group charge and discharge balanced control method of the energy-storage liquid metal battery. By means of the control device and the control method, the defect that initiative balanced control is difficult to implement due to the fact that a voltage platform of the liquid metal battery is low and wide can be overcome, the control method and the control device can meet the requirement for the high-temperature environment during group use of the liquid metal battery, and the complexity of the balanced control device and control method is reduced, so that the energy storage use demands of the liquid metal battery are met.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and specifically relates to a group equalization control device and control method for energy storage liquid metal batteries, which can solve the defect that the voltage platform of liquid metal batteries is low and wide and difficult to implement active equalization control, and deal with The high-temperature environment in which liquid metal batteries are used in groups reduces the complexity of the balance control device and control method. Background technique [0002] Energy storage technology plays a pivotal role in improving the stability of renewable energy generation systems such as wind energy and solar energy, smoothing user-side loads, and improving the safety and stability of power systems. Electrochemical energy storage has become an important direction for the development of energy storage technology due to its flexibility, convenience, high efficiency, and low mainten...

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies on the equalization control of liquid metal batteries in China. The Chinese invention patent specification CN104682511A proposes a method for equalizing the energy consumption of a large current for a full-filled liquid metal battery. This method equalizes the energy consumption and causes energy waste and mass production. Heat problem, and wait for all the batteries to be fully charged in turn, and the equalization speed is slow

Chinese Invention Patent Specification CN105141004A proposes a method of using a high-temperature nonlinear battery to balance the energy consumption of batteries that reach the balance threshold. Although this method has a fast balance speed and simple control, due to the rapid change in the voltage of the liquid metal battery at the end of charge and discharge, The current flowing through the non-linear resistor is also extremely large, causing a lot of loss and heat generation

And these two passive equalization methods are not considered. When liquid metal batteries are used in groups, they need to be placed in a high-temperature incubator, and the external leads of the high-temperature incubator should be reduced as much as possible.

[0005] Due to the above-mentioned defects and deficiencies, further improvement and improvement are urgently needed in this field, and a balance control device and control method for liquid metal batteries are designed so that it can solve the problem that the voltage platform of liquid metal batteries is low and wide and it is difficult to implement active control. The defects of balance control, and the high temperature environment in which liquid metal batteries are used in groups, reduce the complexity of balance control devices and control methods, so as to meet the demand for liquid energy storage metal batteries

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