An online life prediction method for lithium batteries based on two-point life characteristics
A life prediction, lithium battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as little attention to development, achieve the effect of reducing the burden of data storage and good research and development
Active Publication Date: 2022-04-08
ZHEJIANG UNIV
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However, a large amount of current related research focuses on developing better algorithms, and little attention is paid to developing better features
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as figure 1 Shown, the present invention comprises the following steps:
[0033] 1) Collect the charging voltage and charging capacity of the new lithium battery in two different charge-discharge cycles and the life of the current lithium battery, and obtain the voltage-capacity curve corresponding to the two charge-discharge cycles; figure 2 As shown, the two different charge-discharge cycles are specifically: the low order is one of the 1st to 20th charge-discharge cycles, and the high order is one of the 60th and above charge-discharge cycles. During specific implementation, the low order is the 10th charge-discharge cycle, and the high order is the 100th charge-discharge cycle. The life of the lithium battery is obtained through experiments. The lithium battery is continuously charged and discharged. When the actual total c...
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The invention discloses a lithium battery online life prediction method based on two-point life characteristics. The present invention comprises the following steps: 1. Collect the charging voltage, charging capacity and service life of a brand-new lithium battery in different charging and discharging cycles, and obtain two corresponding voltage-capacity curves; 2. Calculate and obtain the capacity difference curve of the current lithium battery; 3. Calculate all charging The two-point life characteristics corresponding to the voltage combination; 4 Repeat steps 1-3 to obtain the life of each lithium battery and the two-point life characteristics corresponding to all charging voltage combinations of each lithium battery; 5 Select the best charging voltage combination and the best two points Life characteristics constitute the training set; 6 Obtain the lithium battery life prediction regression model after training; 7 During online diagnosis, collect and obtain the best two-point life characteristics of the lithium battery to be predicted, and the prediction output obtains the current life of the lithium battery to be predicted life. The invention realizes the accurate prediction of the service life of the lithium battery, and improves the reliability, safety and durability of the lithium battery.
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 specifically relates to a lithium battery online life prediction method based on two-point 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 processes, it is easy to achieve simple, Fast and a...
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IPC IPC(8): G01R31/36
CPCG01R31/36
Inventor 陈剑刘浩
Owner ZHEJIANG UNIV