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Lithium-ion battery capacity estimation and residual cycling life prediction method

A lithium-ion battery, cycle life technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems that lithium battery capacity estimation and remaining life prediction cannot be realized, and achieve the effect of capacity and remaining life prediction

Active Publication Date: 2013-11-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the capacity estimation and remaining life prediction of the lithium battery cannot be realized, the present invention proposes a lithium ion battery capacity estimation and remaining cycle life prediction method

Method used

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  • Lithium-ion battery capacity estimation and residual cycling life prediction method
  • Lithium-ion battery capacity estimation and residual cycling life prediction method
  • Lithium-ion battery capacity estimation and residual cycling life prediction method

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specific Embodiment approach 1

[0020] Specific Embodiments 1. A lithium-ion battery capacity estimation and remaining cycle life prediction method described in this embodiment, the specific steps of the method are:

[0021] Step 1, collect the number of charge and discharge cycles x of the battery to be tested, the discharge voltage and battery capacity of each charge and discharge cycle, and the remaining capacity data z of the battery after each charge and discharge;

[0022] Step 2. The number of charge and discharge cycles x of the collected battery, the discharge voltage and battery capacity of each charge and discharge cycle, and the a / n of the remaining capacity data z of the battery after each charge and discharge are used as training data, and the remaining The (n-a) / n data is used as test data, where n is a positive integer and a is a positive integer smaller than n;

[0023] Step 3, using the segmented cubic Hermite interpolation method to expand the training data, and obtain training data at dif...

specific Embodiment approach 2

[0032] Embodiment 2. This embodiment is a further description of the method for estimating the capacity of a lithium-ion battery and predicting the remaining cycle life described in Embodiment 1. The failure threshold of the battery capacity described in step 8 is 1% of the initial capacity of the battery. 70% or 80%.

specific Embodiment approach 3

[0033] Specific Embodiment 3. This embodiment is a further description of the lithium-ion battery capacity estimation and remaining cycle life prediction method described in Embodiment 1. The area covered by the variance described in step 7 is 95% confidence interval.

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Abstract

The invention relates to a lithium-ion battery capacity estimation and residual cycling life prediction method, and relates to a method for estimating the capacity of a battery and predicting the service life of the battery, which solves the problem that the capacity of a lithium battery cannot be estimated, and the residual service life of the lithium battery cannot be predicted. a / n of the collected charging-discharging cycle times x, the discharging voltage of each charging-discharging cycle, the battery capacity, and the residual capacity data z of the battery after each time of charging and discharging cycle is used as the training data, and the residual data of the (n-a) / n is used as the test data, the training data is expanded by utilizing a segmented tertiary Hermite interpolation method, the training data of different interpolation points obtained after the expansion is used for modeling, a GPR (general purpose register) model with different parameters is used for carrying out the forecasting so as to predict the residual capacity of the battery after N times of charging and discharging cycles of the lithium battery, and the residual capacity of the battery after N times of charging and discharging cycles can be obtained; and the method is suitable for estimating the capacity of the battery and predicting the service life of the battery.

Description

technical field [0001] The invention relates to a method for estimating battery capacity and predicting service life. Background technique [0002] Although a lithium-ion battery is an energy storage and conversion device, it is not infinitely usable, that is, its cycle life is limited, because the performance of the battery will gradually decline as the battery is used. [0003] Lithium-ion battery is a rechargeable battery that mainly relies on the movement of lithium ions between the positive and negative electrodes. The chemical power of the entire battery comes from the difference in the chemical potential of its two electrodes. When the battery is charging, it converts electrical energy into chemical energy and stores it in the battery, and when discharging, it converts chemical energy into electrical energy for the load to use. Due to the reversibility of the two kinds of energy conversion, it seems that the cycle process of charge and discharge is infinite, but it i...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 刘大同周建宝王红庞景月彭宇彭喜元
Owner HARBIN INST OF TECH
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