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Method for predicting cycle life of lithium battery

A technology of cycle life and prediction method, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as property loss, casualties, collapse, etc., and achieve the effect of reducing waste of time and resources

Active Publication Date: 2019-06-07
WUHAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

As a key part of the system's energy supply, damage to the lithium battery will cause the entire system to fail, collapse, and even cause property damage and casualties

Method used

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  • Method for predicting cycle life of lithium battery
  • Method for predicting cycle life of lithium battery
  • Method for predicting cycle life of lithium battery

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with specific examples.

[0034] A method for predicting the cycle life of a lithium battery, comprising the following steps:

[0035] S1. The lithium battery is subjected to charge and discharge performance tests and HPPC performance tests of different cycle times (0-1000 times, and the battery is in a discharge state after the cycle test is stopped), and the voltage and capacity during charge and discharge of different cycle times are recorded.

[0036] In the charging and discharging performance test, the charging current is 1 / 3C, the charging cut-off voltage is 4.2V, the charging cut-off current is set to 0.13A, the discharging cut-off voltage is set to 2.5V, and the constant current discharge current is 0.5C, 1C, 2C or 3C One of them, C is the ratio of the charge and discharge current of the battery. Charge-discharge rate = charge-discharge current / rated capacity; for example, when a battery with...

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Abstract

The invention provides a method for predicting the cycle life of a lithium battery. The lithium battery is subjected to different cycle numbers of charge and discharge performance tests and HPPC performance tests, and the voltage and capacity in the different cycle numbers of charge and discharge processes are recorded; according to change of the voltage of the lithium battery in HPPC test data, internal resistance in the charge and discharge directions under different SOC is calculated, and the average value, namely mean value internal resistance, fit under the different SOC and each cycle number is calculated; under the different cycle numbers, the mean value internal resistance is fitted with the SOC, and the corresponding law is found to obtain mean value internal resistance under thedifferent cycle numbers; and fit calculation is conducted according to test data of the mean value internal resistance and the cycle numbers, and the cycle life of the battery is predicted. The cyclelife of the battery can be quickly predicted through short-term cycle tests, and the time and resource waste generated by conventional tests are greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of lithium battery testing, and in particular relates to a method for predicting the cycle life of a lithium battery. Background technique [0002] During the long-term use of lithium batteries, a series of electrochemical reactions and physical changes will occur inside, which will cause the battery performance and capacity to decline until the end of life. As a key part of the system's energy supply, damage to the lithium battery will cause the entire system to fail, collapse, and even cause property damage and casualties. Predicting the life of lithium batteries can effectively judge its future working ability, find problems in time, and avoid unnecessary troubles and losses. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for predicting the cycle life of a lithium battery, which can predict the remaining cycle life of the battery in...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/387G01R31/382
Inventor 甘小燕窦雅盛武鸿辉余俊锋
Owner WUHAN UNIV OF TECH
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