Equivalent circuit model of supercapacitor battery and parameter identification method thereof

Abstract

The invention discloses an equivalent circuit model of a supercapacitor battery and a parameter identification method thereof. According to the equivalent circuit model of the supercapacitor battery, a negative electrode of the supercapacitor battery is equivalent to a resistance-capacitance parallel branch, a positive electrode of the supercapacitor battery is equivalent to a capacitor, a current collector, a diaphragm, electrolyte and other constituent elements are included, the resistance of the positive electrode and the negative electrode is equivalent to a series resistance, and an ohmic leakage path is approximately equivalent to an open circuit. The parameter identification method comprises the following steps: based on an equivalent circuit model, obtaining model parameters of SOC in every 10% change stage through a circuit analysis method, and solving an average value as an initial value of a recursive least square algorithm to realize parameter identification of the equivalent circuit. The parameter identification precision is high, and the real-time performance is good.

Description

technical field [0001] The invention relates to the technical field of supercapacitor batteries, in particular to an equivalent circuit model of a supercapacitor battery and a parameter identification method thereof. Background technique [0002] With the continuous improvement of new energy development and application technology, the technical problems of energy storage have become increasingly prominent. This problem not only depends on the optimization and control technology of energy distribution, but also is closely related to the performance of the energy storage system itself. Aiming at the performance problems of the energy storage system itself, scholars and experts at home and abroad have developed a variety of new energy storage devices for different occasions, such as lithium-ion batteries, flywheel batteries, fuel cells, superconducting magnets, supercapacitors, etc. Especially for some occasions that require both high specific energy and high specific power, s...

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Problems solved by technology

[0004] The invention provides an equivalent circuit model of a supercapacitor battery and a parameter identification method thereof, which are used to solve the problem of poor real-time identification and poor accuracy of the circuit analysis method in the existing parameter identification method after the equivalent circuit model of the supercapacitor battery is established. Low; and the technical problem that the initial value selection of the recursive least square method is difficult

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