A method for estimating power battery soh based on arima
A power battery and genetic algorithm technology, applied in the field of power battery health state estimation, can solve problems such as complex correlation research, difficulty in accurately predicting power battery SOH value, and large number of cycles
Active Publication Date: 2019-04-12
四川普力科技有限公司
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The current main test methods include definition method, partial discharge method, etc. Among them, the output impedance test method is one of the important methods for power battery SOH prediction, but due to the nonlinear relationship between power battery output impedance and SOH, the correlation between them The research on the relationship between power battery output impedance and SOH is also relatively complicated. Now the research error on the correlation between power battery output impedance and SOH is often large, and it is difficult to accurately predict the power battery SOH value.
At the same time, the existing methods for calculating the power battery output impedance and the power battery SOH fitting equation require a large number of cycles and take a long time
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[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0019] see figure 1 , an ARIMA-based method for estimating the SOH of a power battery can be divided into the following steps.
[0020] The output impedance test method is one of the important estimation methods of the SOH of the power battery. Since the charge and discharge times of the power battery are limited, each charge and discharge will affect the SOH value of the power battery. At the same time, the output impedance of the power battery and the SOH value have the same The change trend of the power battery, the test obtains multiple sets of power battery output impedance d...
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The invention relates to a method for estimating a power battery SOH based on ARIMA. The method comprises following steps: S1, testing and collecting output impedance data of the power battery and corresponding SOH data; step S2, creating an ARIMA model of the output impedance of the power battery and utilizing the ARIMA model of the output impedance of the power battery to fit the output impedance function of the power battery; establishing the ARIMA model of the power battery SOH and utilizing the ARIMA model of the power battery SOH to fit a function of the power battery SOH; step 3, linking the step S2 to obtain the output impedance function of the power battery and the function of the power battery SOH, creating the output impedance of the power battery and the SOH function. The method has following beneficial effects: by the ARIMA model, the SOH value of the power battery is pre-estimated so that experiment number of cycles of SOH data is reduced; and SOH value of the power battery is accurately pre-estimated.
Description
【Technical field】 [0001] The invention relates to the field of estimating the state of health of a power battery, in particular to a method for estimating the SOH of a power battery based on ARIMA. 【Background technique】 [0002] With the rapid development of the power battery industry, the research and commercial application of power batteries have reached a new peak, especially in the field of electric vehicles, power battery technology has attracted the attention and attention of the world. The power battery is a new generation of green high-energy rechargeable power battery, which has the advantages of high voltage, high energy density, and good cycle performance. Among them, regarding the SOH (Section Of Health) percentage of the full charge capacity of the power battery relative to the rated capacity of the power battery, the SOH of a new power battery is 100%, and the SOH of a completely scrapped power battery is 0%. In practical applications, the SOH value of a power...
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IPC IPC(8): G06F17/50G06N3/12
CPCG06N3/126G16Z99/00
Inventor 冯雪松向勇刘家琛
Owner 四川普力科技有限公司