An online aging diagnosis method for lithium batteries based on two-point impedance aging characteristics
A diagnostic method, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of reflecting the real-time aging state of lithium batteries and the long measurement time of electrochemical impedance spectroscopy, so as to reduce the burden of data storage and be safe and reliable running effect
Active Publication Date: 2022-07-08
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 aging state of lithium batteries, which has certain limitations.
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[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] like figure 1 As shown, the present invention comprises the following steps:
[0030] 1) Measure the electrochemical impedance spectrum and the total capacity of the lithium battery at a specific charge state of charge in each charge-discharge cycle of the new lithium battery; the specific charge state of charge is a certain value in the 0%-100% state of charge. 100% state of charge when implemented. The total number of charge-discharge cycles is the total number of cycles when the total capacity of the lithium battery decays to 75% of the total capacity of the initial lithium battery.
[0031] 2) Calculate the two-point impedance aging characteristics corresponding to all electrochemical impedance spectrum frequency combinations of the current lithium battery in each charge-discharge cycle;
[0032] Step 2) is specifically:
[0033]...
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The invention discloses an on-line aging diagnosis method for lithium batteries based on two-point impedance aging characteristics. The present invention includes the following steps: 1. Measure the electrochemical impedance spectrum and the total capacity of the lithium battery under a specific state of charge in each charge-discharge cycle of a brand-new lithium battery; 2. Calculate the current lithium battery corresponding to different frequency combinations in each charge-discharge cycle 3 Repeat steps 1-2 to obtain all two-point impedance aging characteristics and total capacity of each lithium battery in each charge-discharge cycle; 4. Select the best performance of all lithium batteries in each charge-discharge cycle The two-point impedance aging feature and the corresponding total capacity of the lithium battery constitute the training set; 5. Obtain the regression model of the lithium battery aging diagnosis after training; 6. During online diagnosis, measure and calculate the best two-point impedance aging feature of the lithium battery to be diagnosed. Obtain the total capacity of the lithium battery to be diagnosed, thereby judging the aging state. The present invention realizes accurate aging diagnosis of lithium battery, which is helpful for safer and more reliable operation.
Description
technical field [0001] The invention belongs to an on-line aging diagnosis method of a lithium battery, which belongs to the field of lithium battery research and development and application, and particularly relates to an on-line aging diagnosis method of a lithium battery based on two-point impedance aging characteristics. Background technique [0002] Due to its many advantages such as high energy density, low cost, fast response to power demand, and long cycle life, lithium batteries have been widely commercialized in various fields. Aging diagnosis technology plays an important role in the safe and reliable operation of lithium batteries. 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 has become a challenge to achieve simple, fast and accurate aging diagnosis of lithium batteries under complex dynamic operating conditions . In addition, for large bat...
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IPC IPC(8): G01R31/392
CPCG01R31/392Y02E60/10
Inventor 陈剑刘浩
Owner ZHEJIANG UNIV