Method for predicting cycle life and residual life of lithium ion battery

A lithium-ion battery and cycle life technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of lengthening the evaluation test cycle and affecting the development progress, etc., and achieve the effect of shortening the test cycle and high accuracy

Pending Publication Date: 2021-11-05
TIANJIN LISHEN BATTERY +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous upgrading of the market, the cycle life of lithium-ion batteries has also increased accordingly. In the process of battery research and development, the evaluation and testing cycle of lithium-ion battery life has also been lengthened, which seriously affects the progress of research and development.

Method used

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  • Method for predicting cycle life and residual life of lithium ion battery
  • Method for predicting cycle life and residual life of lithium ion battery
  • Method for predicting cycle life and residual life of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1. Establishment of electrolyte content detection method:

[0031] Step 1: Make a reference battery Ref Cell according to the battery model to be tested. The difference between the reference battery and the normal battery is that the reference battery is injected with absolute ethanol or other organic solvents whose solidification temperature is lower than the solidification temperature range of the electrolyte, while the normal battery is injected with the electrolyte, and then press Normal process package.

[0032] Step 2: Fabrication of series batteries with different electrolyte contents. In order to carry out the quantitative calculation of the electrolyte content in the battery, referring to the test principle of the external standard method, a series of batteries with different electrolyte content were produced. 4.9g.

[0033] Step 3: The reference battery and the battery with different electrolyte content are tested and analyzed with the established in-situ d...

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Abstract

The invention belongs to the field of lithium battery testing, and particularly relates to a method for predicting cycle life and residual life of a lithium ion battery. The method comprises the steps of 1, taking a to-be-tested battery, carrying out cycle type charging and discharging test on the to-be-tested battery by using set current and voltage in a set working environment, and collecting cycle times and battery capacity data after each cycle; 2, establishing a relation curve between the electrolyte content and the battery capacity retention ratio; 3, determining the electrolyte consumption rate of the battery to be tested after short-term circulation; and 4, calculating the residual life and the life of the battery. The method is an in-situ nondestructive test, the test does not influence normal circulation of the battery and is not influenced by volatilization of electrolyte when the battery is disassembled, the accuracy of a test result is relatively high, and the service life test period of the battery is shortened.

Description

technical field [0001] The invention belongs to the field of lithium battery testing, in particular to a method for predicting the cycle life and remaining life of a lithium ion battery. Background technique [0002] As a new generation of green, high-energy and environment-friendly batteries, lithium-ion batteries are widely used in daily life and production, and have become an important development target of secondary batteries. With the continuous upgrading of the market, the cycle life of lithium-ion batteries has also increased accordingly. In the process of battery research and development, the evaluation and testing cycle of lithium-ion battery life has also been lengthened, seriously affecting the progress of research and development. [0003] Therefore, the development of lithium-ion battery life and remaining life prediction methods, whether in the battery life evaluation test in the battery research and development process, or in the battery performance evaluation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/36G01R31/387G01R31/378G01R31/367
CPCG01R31/392G01R31/3648G01R31/387G01R31/378G01R31/367
Inventor 赵培李慧芳李飞伍绍中
Owner TIANJIN LISHEN BATTERY
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