Method for calculating state of charge of battery based on equivalent circuit model of energy storage lithium battery
A battery state of charge, equivalent circuit model technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of insufficient accuracy of the state of charge of the energy storage lithium battery, which cannot be well adapted to the actual work of the energy storage lithium battery conditions and other issues, to achieve the effect of accurate state of charge
Pending Publication Date: 2022-07-22
HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
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[0004] In order to solve the problem that the existing fixed off-line circuit model does not fit the actual working conditions of the energy storage lithium battery well, resulting in insufficient accuracy in estimating the state of charge of the energy storage lithium battery
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[0033] For a clearer understanding of the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below with reference to the accompanying drawings and embodiments. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without these details. It will be apparent to those skilled in the art that various changes can be made in the embodiments disclosed herein, and the general principles defined in this application may be applied to other Examples and application scenarios. Therefore, this application is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the scope of what is claimed herein.
[0034] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
[0035] State of charge (SOC) is a relative measure of the energy stored in a battery, ...
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The invention provides a method for calculating the state of charge of a battery based on an equivalent circuit model of an energy storage lithium battery, and the method comprises the steps: obtaining a nonlinear relation between the open-circuit voltage of the equivalent circuit model of the energy storage lithium battery and the state of charge of the battery, and obtaining a to-be-identified parameter based on the equivalent circuit model of the energy storage lithium battery, the parameters to be identified comprise battery ohmic resistance, battery polarization internal resistance and battery polarization capacitance; based on the data of the terminal voltage, the current and the open-circuit voltage of the battery at the historical moment and the nonlinear relationship between the open-circuit voltage and the state of charge, identifying and optimizing the to-be-identified parameter by adopting a cuckoo search algorithm to obtain the optimal value of the to-be-identified parameter, and obtaining the optimal model of the equivalent circuit of the energy storage lithium battery according to the optimal value of the parameter; and on-line calculation of the state of charge of the battery is realized based on the equivalent circuit optimal model of the energy storage lithium battery. According to the invention, the problem that the precision of estimating the state of charge of the energy storage lithium battery is insufficient due to the fact that a fixed off-line circuit model cannot well accord with the actual working condition of the lithium battery is solved.
Description
technical field [0001] The present application relates to the technical field of state-of-charge estimation of energy storage lithium batteries, and particularly designs a method for calculating battery state of charge based on an equivalent circuit model of energy storage lithium batteries. Background technique [0002] The estimation of the state of charge of the energy storage lithium battery is the focus and difficulty of the energy management system of the energy storage power station. The battery state of charge value cannot be directly obtained by measurement like voltage and current, and can only be estimated by other means. Since the energy storage lithium battery is equivalent to a black box system during operation, it will be affected by various unknown factors such as the environment and component aging. Therefore, accurately and effectively estimating the battery state of charge is of great significance for prompting the performance of the energy storage battery...
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IPC IPC(8): G01R31/367
CPCG01R31/367
Inventor 杨皓杰赵彤孙丰诚李倩倪军
Owner HANGZHOU ANMAISHENG INTELLIGENT TECH CO LTD
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