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Battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement

A technology for battery health status and chemical impedance spectroscopy, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of inability to apply online measurement of electric vehicle battery management systems, and achieves low cost, strong versatility, and high efficiency. Effect

Inactive Publication Date: 2019-05-17
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the existing EIS measurement methods are all carried out by applying excitation to measure the corresponding response, which requires a special electrochemical workstation or impedance analysis equipment, so it cannot be applied to the electric vehicle battery management system for online measurement

Method used

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  • Battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement
  • Battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement
  • Battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement

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Embodiment

[0046] The battery used in this embodiment is an NCR18650 ternary lithium battery, and the Nyquist plot of the electrochemical impedance spectrum of 80% of the SOC of the battery is measured at room temperature, referring to figure 2 , where the horizontal axis is the real part of the impedance, and the vertical axis is the amplitude of the imaginary part of the impedance. From left to right, it is divided into high frequency (5Hz-5kHz), intermediate frequency (0.1Hz-3.5Hz), and low frequency (below 0.1Hz) , where the position of the low-frequency inflection point reflects the extent of the side reaction of the solid electrolyte (SEI) film inside the battery. As the number of battery cycles increases, the SEI film accumulated by side reactions inside the battery gradually thickens, resulting in a continuous decrease in the concentration of recyclable lithium ions, and at the same time, the internal resistance of the battery also continues to increase, resulting in aggravated a...

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Abstract

The invention discloses a battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement. According to the battery health state estimation method based on on-line electrochemical impedance spectroscopy measurement, a Morlet wavelet is used for signal processing of voltage and current data of a battery collected under the actual use condition of a battery, an EIS of the battery is obtained, and then an SOH of the battery is characterized by the EIS; compared with data-driven methods, a large number of experiments do not need to be conducted, and universality is high; and compared with existing methods based on electrochemical model parameters or equivalent circuit model parameters, calculation is easy, and the accuracy degree is high. According tothe method of using the Morlet wavelet to transform the collected voltage and current data of the battery under the actual use condition to obtain the EIS of the battery has the advantages of simplicity, low cost, high efficiency and on-line analysis compared with a method of measuring the EIS by applying excitation.

Description

technical field [0001] The invention belongs to the technical field of battery health state estimation, in particular to a battery health state estimation method based on online impedance spectrum measurement. Background technique [0002] As environmental problems and energy crises continue to intensify, electric vehicles are favored by various companies in various countries for their advantages of energy saving, zero waste emissions, and low noise. As one of the core technologies of electric vehicles, the battery management system is an important link connecting the vehicle power battery and electric vehicles. It must be able to monitor the battery operating condition in real time and estimate the state of charge (SOC) and state of health (SOH) of the battery in order to provide relevant information necessary for decision-making for the on-board control system and the driver or passenger . An excellent battery management system can not only give full play to the advantag...

Claims

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Application Information

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IPC IPC(8): G01R31/392
Inventor 徐俊侯文龙赵云飞梅雪松
Owner XI AN JIAOTONG UNIV
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