Lithium battery online life prediction method based on two-point impedance life characteristics
A life prediction and lithium battery technology, which is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables, can solve the problems of reflecting the real-time state of lithium batteries and the long measurement time of electrochemical impedance spectroscopy, so as to reduce the burden of data storage and improve research and development. Effect
Active Publication Date: 2021-10-01
ZHEJIANG UNIV
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Problems solved by technology
However, the measurement time of electrochemical impedance spectroscopy is long, and it is difficult to implement it online to reflect the real-time status of lithium batteries, which has certain limitations.
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[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] like figure 1 As shown, the present invention comprises the following steps:
[0029] 1) Collect the electrochemical impedance spectrum of the new lithium battery under a specific charge and charge state in a specific charge-discharge cycle and the life of the lithium battery; a specific charge-discharge cycle is specifically one of the 1-100th charge-discharge cycles, The specific charge state of charge is specifically a certain value from 0% to 100% of the state of charge. The specific implementation is the second charge-discharge cycle and 100% state of charge. The life of the lithium battery is obtained from the experiment, and the lithium battery is continuously charged and discharged. When the actual total capacity of the lithium battery decays to 80% of the initial total capacity of the lithium battery, the current number of cha...
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The invention discloses a lithium battery online life prediction method based on two-point impedance life characteristics. The method comprises the following steps: 1, collecting an electrochemical impedance spectrum of a brand-new lithium battery in a specific charge state in a specific charge-discharge cycle and the service life of the lithium battery; 2, calculating two-point impedance life characteristics corresponding to all electrochemical impedance spectrum frequency combinations of the current lithium battery; 3, repeating the steps 1-2 to obtain the service life of each lithium battery and two-point impedance service life characteristics corresponding to all electrochemical impedance spectrum frequency combinations of each lithium battery; 4, selecting the optimal two-point impedance life characteristics of all the lithium batteries and the lives of the corresponding lithium batteries to form a training set; 5, obtaining a trained lithium battery life prediction regression model; and 6, during online diagnosis, obtaining the optimal two-point impedance life characteristics of the lithium battery to be predicted, and predicting and outputting to obtain the life of the current lithium battery to be predicted. Accurate prediction of the service life of the lithium battery is realized, and the reliability, the safety and the durability of the lithium battery are improved.
Description
technical field [0001] The invention belongs to a lithium battery online life prediction method in the field of lithium battery research and development and application, and particularly relates to a lithium battery online life prediction method based on two-point impedance life characteristics. Background technique [0002] Lithium batteries have the advantages of low cost, high energy density, and long cycle life, and are widely used in stationary, portable, and transportation fields. Life prediction technology plays an important role in accelerating the research and development of new materials, new structures and new management systems for lithium batteries, as well as the safe operation, predictive maintenance and secondary use of lithium batteries in practical applications. However, due to the complex aging mechanism of lithium batteries, and the aging path is affected by many factors in the design, production and application process, it is difficult to achieve simple,...
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IPC IPC(8): G01R31/36
CPCG01R31/382Y02E60/10
Inventor 陈剑刘浩
Owner ZHEJIANG UNIV