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Lithium battery aging detection method based on time series analysis

A time series analysis and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as difficult to accurately measure internal resistance and small internal resistance

Active Publication Date: 2019-04-12
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For SOH, the battery aging degree is generally estimated by detecting the internal resistance, but the internal resistance is very small, and is affected by the current temperature and power, so it is difficult to accurately measure the internal resistance

Method used

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  • Lithium battery aging detection method based on time series analysis
  • Lithium battery aging detection method based on time series analysis
  • Lithium battery aging detection method based on time series analysis

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Embodiment Construction

[0039] The embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0040] Such as figure 1 Shown, the present invention is specifically implemented as follows:

[0041] For the 14500 lithium battery, the equipment used includes a computer and a battery charge and discharge tester.

[0042] S1: Test the brand new battery to obtain the benchmark time series data, and test the aging battery to obtain the aging time series data;

[0043] S1A. Perform the following test process on a new battery to obtain benchmark time series data:

[0044] Carry out a charge and discharge test on a new battery, and charge the battery at 1C 5 AConstant current charging to the limited voltage and then constant voltage charging until the charging current is less than 0.05C 5 A; After charging, place it in an environment of 15-25°C for no less than 1 hour; then charge the battery ...

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Abstract

The invention discloses a lithium battery aging detection method based on time series analysis. A brand-new battery is tested to obtain reference time series data, and an aging battery is tested to obtain aging time series data. According to the comparison between the reference time series data and the aging time series data, similarity between the aging battery and the brand-new battery is calculated to obtain the aging degree of the aging battery. The lithium battery aging detection method based on time series analysis bypasses the complex reason of internal aging of a lithium battery and can achieve the effect of accurately describing the aging degree result of the lithium battery.

Description

technical field [0001] This paper involves a battery detection method in the field of battery detection, specifically a lithium battery aging detection method based on time series analysis. Background technique [0002] Due to the advantages of high working voltage, high energy density, long cycle life and high safety, low pollution, low self-discharge rate, and no memory effect, lithium-ion batteries have gradually become indispensable. During the use of lithium-ion batteries , the life of the battery will gradually decrease due to various complex reasons, and the aging of the battery affects the capacity and output power of the battery, so it is necessary to detect and judge the aging characteristics of the battery. [0003] The battery performance state includes SOC and SOH. SOC represents the amount of remaining battery power or the length of remaining running time in the current charging cycle. SOC commonly used methods include current integration method, open circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/396
CPCG01R31/3648
Inventor 刘铁军郑世杰
Owner CHINA JILIANG UNIV