Method and device for establishing regression model of electrochemical characteristic impedance of lithium battery
The invention relates to a method and device for establishing a regression model of electrochemical characteristic impedance of a lithium battery. The method comprises the steps: obtaining an electrochemical impedance spectrum of a solid-liquid mixed electrolyte lithium battery based on different te...
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Main Authors | , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
04.01.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The invention relates to a method and device for establishing a regression model of electrochemical characteristic impedance of a lithium battery. The method comprises the steps: obtaining an electrochemical impedance spectrum of a solid-liquid mixed electrolyte lithium battery based on different temperatures and SOC conditions; describing the characteristic impedance of the solid-liquid mixed electrolyte lithium battery electrode process dynamics, and selecting characteristic points from a Nyquist graph obtained after a electrochemical impedance spectroscopy test for analysis, wherein the positions and meanings of the characteristic points are partially changed along with the change of the battery system; and determining a nonlinear relationship between the temperature of the characteristic impedance of the solid-liquid mixed electrolyte lithium battery and the SOC according to the characteristic points to obtain a nonlinear regression model. According to the invention, comprehensive tests are designed, a se |
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Bibliography: | Application Number: CN202111241573 |