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A lithium battery modeling method and system based on voltage hysteresis effect

A technology of voltage hysteresis and modeling method, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of increasing SOC estimation error, poor real-time performance, low accuracy, etc., to reduce model errors and model parameters. , high precision effect

Active Publication Date: 2021-08-06
BEIHANG UNIV
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Problems solved by technology

[0006] Aiming at problems such as the low accuracy and poor real-time performance of the existing lithium-ion battery model, which lead to an increase in the SOC estimation error, which affects the service life of the lithium battery and has potential safety hazards, the present invention provides a lithium battery modeling method based on the voltage hysteresis effect , by obtaining the functional relationship between the charge and discharge terminal voltage of the lithium battery and the SOC to determine the hysteresis voltage response of the open circuit voltage, which provides a guarantee for the accuracy and real-time performance of the lithium battery model, and can provide more accurate information for the model-based SOC estimation method, further Improved performance of BMS

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  • A lithium battery modeling method and system based on voltage hysteresis effect
  • A lithium battery modeling method and system based on voltage hysteresis effect
  • A lithium battery modeling method and system based on voltage hysteresis effect

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Embodiment Construction

[0041] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] The present invention relates to a lithium battery modeling method based on the voltage hysteresis effect, that is to say, the purpose of the present invention is to provide a modeling method of a lithium battery (such as lithium iron phosphate battery) hysteresis voltage model, which is used to determine the open circuit The hysteresis voltage response of the voltage provides guarantee for the accuracy and real-time performance of the lithium battery model. The flow chart of the method is as figure 1 shown, including the following steps:

[0043] Step A: Also known as the pulse charge and discharge test experiment step, it is to conduct constant current constant voltage charge and pulse charge and discharge test experiments on lithium batteries at different temperatures and magnifications, that is to say, to conduct constant current...

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Abstract

The present invention provides a lithium battery modeling method and system based on the voltage hysteresis effect. The method includes: step A: performing constant current and constant voltage charging at a certain temperature and pulse charge and discharge tests at different temperatures and rates for the lithium battery Experiment to obtain the functional relationship between the charging and discharging terminal voltage of the lithium battery and the state of charge of the lithium battery, and then analyze and determine the hysteresis voltage response in the open circuit voltage; step B: establish a comprehensive model of the lithium battery, which incorporates the The second-order nonlinear equivalent circuit model of the open circuit voltage of the lithium battery obtained from the state of charge of the lithium battery and the hysteresis model describing the dynamic hysteresis voltage; step C: identify the dynamic parameters in the comprehensive model of the lithium battery; step D: The obtained dynamic parameters are simulated and verified. This modeling method guarantees the accuracy and real-time performance of the lithium battery model, and can provide more accurate information for the model-based SOC estimation method, further improving the performance of the BMS.

Description

technical field [0001] The invention relates to the technical field of electric vehicle power battery management, in particular to a lithium battery modeling method and system based on voltage hysteresis effect. Background technique [0002] Over the past century, with the rapid increase in the number of cars on the road, it has brought more and more harm to the natural environment, work and life: energy crisis, frequent smog, traffic jams, etc. Cars have become obstacles to the further development of society . Under the double crisis of energy and environment, combined with national conditions and the development status of the automobile industry, my country continues to promote electric vehicles (including pure electric vehicles EV, plug-in hybrid electric vehicles PHEV) and fuel vehicles FCEV and other environmentally friendly vehicles, and is committed to realizing Zero emissions, zero pollution and energy transition. [0003] Lithium-ion batteries have been widely used...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/367G01R31/388
CPCG01R31/367G01R31/388
Inventor 杨世春何瑢华旸郭斌闫啸宇
Owner BEIHANG UNIV
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