A low-temperature frequency-domain electro-thermal model construction method for lithium-ion batteries
A technology of lithium-ion battery and construction method, which is applied in the field of low-temperature frequency domain electro-thermal model construction, can solve the problems of temperature influence, unknown frequency domain performance, complex model, etc., and achieves the effects of high precision, convenient calculation, and simple model.
Active Publication Date: 2018-04-27
BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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[0007] The invention provides a method for constructing a low-temperature frequency-domain electro-thermal model of a lithium-ion battery, which can improve problems in the prior art such as complex models, unknown frequency-domain performance, and the influence of temperature on electrical parameters.
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[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0049] A method for constructing a low-temperature frequency-domain electro-thermal model of a lithium-ion battery, the method comprising the following steps:
[0050] S1. Construct an equivalent circuit model based on EIS (electrochemical impedance spectroscopy) data, determine the structure of the equivalent circuit model, and identify the model parameters of lithium-ion batteries in the high frequency and low frequency ranges, including ohmic resistance, inductance, Polarization resistance and polarization capacitance;
[0051]S2, according to the polarization resistance and polarization capacitance determined in step S1, based on the electrochemical reaction mechanism inside the lithium ion battery, construct the functional relationship between polarization resistance, polarization capacitance and frequency, and obtain the unknown coefficient of the...
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The invention discloses a method for constructing establishing a low-temperature frequency domain electric-thermal model of a lithium-ion battery. The method comprises the following steps: determining a model structure, and identifying model parameters according to the structure; after the model parameters are determined, constructing establishing a functional relationship among a polarization resistance, a polarization capacitance and a frequency according to a relationship between battery polarization impedance and the frequency; acquiring function unknown coefficients at different temperatures, and constructing establishing functional relationships between the function unknown coefficients and the temperatures to obtain the low-temperature frequency domain electric-thermal model of the lithium-ion battery finally. The model can be applied to a vehicle-mounted battery management system. For example, an optimal low-temperature self-heating method is resolved on the basis of the model. The model has the advantages of easiness, practicability, high accuracy and the like. The technical scheme of the invention is simple, is easy to operate, and is practical.
Description
technical field [0001] The invention relates to a method for constructing a low-temperature model of a battery, in particular to a method for constructing a low-temperature frequency-domain electro-thermal model of a lithium-ion battery. Background technique [0002] The dual pressure of energy shortage and environmental pollution has boosted the rapid development of electric vehicles. Lithium-ion batteries have become the preferred battery for electric vehicles due to their advantages of high single voltage, high energy density, long life, no memory effect and no pollution. . [0003] However, due to the obvious decrease in the conductivity of the electrolyte and conductive materials at low temperatures, the chemical reaction kinetics and diffusion kinetics of lithium-ion batteries are significantly slow, and the internal resistance increases tenfold compared to room temperature. Therefore, in a cold environment, lithium The energy conversion efficiency of ion batteries is...
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IPC IPC(8): G01R31/36
CPCG01R31/367
Inventor 阮海军张维戈吴健孟学东韩耸
Owner BEIJING BEIJIAO NEW ENERGY TECH CO LTD