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Construction method for lithium battery health life model

A construction method and technology for lithium batteries, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as difficult to obtain effective capacity information of lithium batteries

Active Publication Date: 2017-03-22
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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AI Technical Summary

Problems solved by technology

However, in actual engineering applications, factors such as variable test environments, limited test conditions, and limited test time determine that it is difficult to directly obtain information on the effective capacity of lithium batteries.

Method used

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  • Construction method for lithium battery health life model
  • Construction method for lithium battery health life model
  • Construction method for lithium battery health life model

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Experimental program
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Embodiment Construction

[0046] Usually, the cycle life and calendar life are mainly based on the number of cycles or storage time, and the test plan is designed considering different influencing factors. However, the lithium battery cannot obtain relevant data such as cycle times and running time in an offline state. The invention takes the health factor--dynamic internal resistance as the research object, and designs a lithium battery health life test experiment to seek the relationship between the dynamic internal resistance and the healthy state of the lithium battery. The experimental test flow chart is as follows figure 1 As shown, it mainly includes the basic performance test and accelerated aging test of the single battery.

[0047] During the basic performance test of a single battery, different discharge intervals (5s, 10s, 20s, 30s, 1min) are selected for the dynamic internal resistance test. In order to verify the performance of lithium batteries at different ambient temperatures, the range...

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Abstract

The invention discloses a construction method for a lithium battery health life model, and the method is used for the recognition of the aging degree of a lithium battery. The method comprises the steps: firstly carrying out the health lift testing of the lithium battery; secondly constructing the health factor of the lithium battery according to the testing data; thirdly building the lithium battery health life model according to the constructed health factor, thereby achieving the prediction of the health state of the lithium battery; fourthly sequentially carrying out the testing of basic performances at four temperature points (25 DEG C, 40 DEG C, 10 DEG C and 55 DEG C) during the testing of the health life; fifthly carrying out the acceleration aging testing at the degree of 55 DEG C; and finally finishing the testing when the static capacity test value decreases to 75% of a rated capacity. The method carries out the direct obtaining of the performance parameters of the lithium battery based on testing data, carries out the research how to extract the health features to achieve the recognition of the aging degree of the lithium battery, and can be used for achieving the prediction of the health state of the lithium battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a method for constructing a lithium battery healthy life model, which is applied to the identification of the aging degree of lithium batteries. Background technique [0002] Lithium-ion batteries (referred to as lithium batteries) gradually replace lead-acid, nickel-metal hydride, nickel-cadmium and other batteries with the advantages of light weight, small size, long life, high voltage, and no pollution, and become the first choice for electric vehicle power batteries. When the charging capacity of the automobile lithium battery pack is reduced to about 80% of its original capacity, it is no longer suitable for continued use in electric vehicles. If these lithium battery packs are scrapped for recycling and cannot be fully utilized, it will cause Great waste of resources. When the appearance of the lithium battery is intact, there is no damage, and the functional components ar...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/3648G01R31/389G01R31/392
Inventor 孙冬许爽岳永胜尚展垒吴青娥顾冬华韩振宇
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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