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Lithium battery cycle life quick testing method

A cycle life and test method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of long time consumption and inability to evaluate battery cycle life, and achieve the effect of shortening design and avoiding long test time

Active Publication Date: 2013-10-09
BEIJING JIAOTONG UNIV +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] Aiming at the shortcomings of the existing battery cycle life test method, which takes a long time and cannot quickly evaluate the battery cycle life, the present invention proposes a battery cycle life rapid test method

Method used

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  • Lithium battery cycle life quick testing method
  • Lithium battery cycle life quick testing method
  • Lithium battery cycle life quick testing method

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0045] The invention provides a method for quickly estimating battery capacity. Taking lithium iron phosphate battery as an example to illustrate,

[0046] first follow figure 1 The equivalent circuit model of the lithium battery is shown, and the polarization voltage-state of charge (V P -SOC) curve.

[0047] The equivalent circuit model of a lithium battery is an important tool for linking the internal chemical reactions of the battery with the external output characteristics. Such as figure 1 As shown, V o Indicates the battery terminal voltage, I indicates the charging current, V OCV Indicates the electromotive force of the battery, R Ω Represents the connection impedance of each part inside the battery, R p1 Indicates the charge transfer resistance composed of various films (oxidation film, passivation film, deposition film and adsorption film) f...

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Abstract

The invention relates to the technical field of lithium battery parameter determination methods, in particular to a lithium battery cycle life quick testing method. The method includes the steps of step 1, determining charge state interval for cycle life quick testing according to polarization voltage characteristics of a battery sample, step 2, carrying out a battery cycle life quick test to obtain cycle life test experimental data, step 3, carrying out cycle life mathematic model deduction in partial charge interval, step 4, establishing cycle life deduction mathematic models in 0-100% charge interval, step 5, obtaining a cycle life formula of a battery in the 0-100% charge interval, and step 6, estimating the cycle life of the tested battery. The lithium battery cycle life quick testing method overcomes the defects that time for conventional testing is long, and difference between an accelerated cycle life testing method and the reality is large, and shortens design, development and testing periods of batteries.

Description

technical field [0001] The invention relates to the technical field of lithium battery parameter determination methods, in particular to a lithium battery cycle life rapid test method. Background technique [0002] According to the relevant national standards for the use of electric vehicle batteries, the effective capacity of power batteries for electric vehicles shall not be less than 80% of the rated capacity. The cycle life of the battery is the number of cycles when the battery capacity declines to 80% of the rated capacity. Battery cycle life is an important indicator of battery performance. However, the existing cycle life tests of lithium batteries mainly perform accelerated life tests on batteries by setting extreme test conditions (such as high current excitation, high temperature, and low temperature environments), and there is no clear quantitative correspondence between the accelerated life test results and the conventional life test results . If the accelera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 姜久春张维戈张彩萍时玮刘秋降张言茹李雪王玉坤白恺陈豪
Owner BEIJING JIAOTONG UNIV
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