A modeling method for liquid metal batteries

Abstract

The invention discloses a method for acquiring characteristic parameters of a liquid metal battery, and a liquid metal battery modelling method. The method comprises the steps of: respectively performing a pulse test in a charging direction, a pulse test in a discharging direction and a hybrid pulse power performance test of the liquid metal battery, so that battery current, voltage and charging and discharging time test data can be obtained; fitting by utilizing the test data, so that a function relational expression of open-circuit voltage Uoc and SOC is obtained; and obtaining the function relational expression of various characteristic parameters related to SOC in the charging and discharging directions respectively by taking the pulse process test data and the charging and discharging process test data as input data of a characteristic parameter identification and simulation model of the liquid metal battery at the same time. According to the method disclosed by the invention, the fact that the characteristic parameters of the liquid metal battery are relatively changed drastically at high SOC and low SOC is sufficiently considered; the liquid metal battery characteristic parameters and output characteristics can be accurately obtained by adjusting a pulse test step and a parameter identification process; and thus, the relatively accurate battery model can be obtained.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a modeling method of a liquid metal battery. Background technique [0002] Electrochemical energy storage technology plays a pivotal role in enhancing the grid's ability to accept large-scale renewable energy, promoting the upgrade and transformation of traditional grids, improving power supply reliability, and improving power quality. However, the existing electrochemical energy storage technologies cannot meet the requirements of large-scale energy storage systems due to poor safety characteristics and high energy storage costs. Liquid metal batteries are a new type of electrochemical energy storage developed to meet this challenge. technology. The working temperature of the liquid metal battery is between 300°C and 700°C, the positive and negative electrode materials are made of cheap liquid metal, and the electrolyte is molten inorganic salt. Si...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a liquid metal battery modeling method, the purpose of which is to accurately obtain the liquid metal battery characteristic parameters and Output characteristics, obtain an improved liquid metal battery characteristic parameter acquisition method, and then obtain an improved liquid metal battery modeling method, thereby solving the liquid metal battery modeling method in the prior art, because the liquid metal battery is not considered The characteristic parameters change drastically between high SOC and low SOC, and the characteristic parameters of the actual charging and discharging direction are not exactly the same, and the technical problem of the accuracy of the liquid metal battery model in the prior art is not high

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