Modeling method of liquid state or semi-liquid state metal battery

Abstract

The invention discloses a modeling method of a liquid state or semi-liquid state metal battery. The modeling method comprises the following steps: according to a battery impedance spectrum, carrying out fitting, constructing a battery impedance spectrum fitting circuit, and constructing the equivalent circuit model of the battery according to the battery impedance spectrum fitting circuit; adopting symmetrical impulse to carry out a hybrid impulse power performance test on the battery, and obtaining test data used for distinguishing the open-circuit voltage, the resistance and the capacitance parameters of the battery; according to the test data, fitting a function relationship between SOC (State of Charge) and the electrodynamic force, the Ohmic internal resistance, the polarization resistance, the polarization capacitance, the diffusion equivalent resistance and the diffusion equivalent capacitance of the battery, and distinguishing the parameters of the equivalent circuit model; adopting an ampere-hour method to calculate the SOC of the battery; correcting the SOC to obtain a corrected SOC; according to the corrected SOC, correcting the parameters of the equivalent circuit model; and finishing modeling. The modeling method can accurately simulate the external characteristics of the liquid state or semi-liquid state metal battery, and lays a foundation for the charging and discharging management and the subsequent application of the type of novel power grid type energy storage battery including the liquid state or semi-liquid state metal battery.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage modeling, and more particularly relates to a modeling method for a liquid or semi-liquid metal battery. Background technique [0002] As the global energy and environmental crises become more and more serious, renewable energy has become the focus of attention, but renewable energy power generation is intermittent and volatile, and connecting it directly to the grid will reduce power quality and even threaten the security and safety of the power system. reliability. With the help of large-scale energy storage technology, many problems caused by the intermittency and volatility of renewable energy can be effectively solved, the isolation of the power generation side and the grid side can be realized, and the ability of the grid to accept renewable energy can be greatly improved. Effective consumption of renewable energy can not only cut peaks and fill valleys, improve the contradict...

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Problems solved by technology

[0003] The existing battery models include the modeling model of the lead-acid battery based on the internal resistance method based on impedance spectroscopy analysis, the electrochemical model based on the electrode process and thermodynamic potential proposed for the proton exchange membrane fuel cell, and the lead-acid battery and lithium-ion battery respectively. The equivalent circuit model established by the battery, as well as the combination of the genetic algorithm and the equivalent circuit model to determine the optimal model parameters of the battery; the above models are mainly for lead-acid batteries, lithium-ion batteries and fuel cells; liquid or semi-liquid metal batteries are The new energy storage battery facing the grid, its special internal state and the characteristics of low voltage and high current make the existing battery model not suitable for it, and applying the existing modeling method will cause large errors

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