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Judgment method for the reason of lithium battery performance degradation

A lithium battery, performance technology, applied in the field of judging the cause of lithium battery performance decline, to achieve the effect of simple internal reaction

Active Publication Date: 2016-05-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for judging the cause of lithium battery performance degradation, and to determine the cause of lithium battery performance degradation by comparing the charging Δv-t curve and discharging Δv-t curve corresponding to different cycle charge and discharge times of the lithium battery. , Overcoming the defect that the existing technology cannot realize the judgment of the cause of lithium battery performance degradation during the daily use of lithium batteries

Method used

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  • Judgment method for the reason of lithium battery performance degradation
  • Judgment method for the reason of lithium battery performance degradation
  • Judgment method for the reason of lithium battery performance degradation

Examples

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Embodiment 1

[0044] The method for judging the cause of lithium battery performance degradation of the present embodiment, the steps are as follows:

[0045] The first step is to obtain the charging Δv-t curve of the lithium battery:

[0046] During the lithium battery charging process, take the two-hour charging time interval from the beginning of charging the lithium battery to the moment when it reaches the highest rated voltage and stop charging. Lithium battery voltage value v i , i=0,1,2,...,8200, where the first voltage value collected is the highest rated voltage value reached immediately before the lithium battery stops charging, as the recorded voltage value at 0 time, denoted as v 0 , using the voltage value v recorded at the subsequent moment i Subtract the voltage value v 0 Get the voltage difference, automatically follow the abscissa time to connect the ordinate voltage difference point, and obtain a charging Δv-t curve. The above is divided into two periods, and the lithi...

Embodiment 2

[0059] Except that the third step is changed to "Combine any charging Δv-t curve obtained in the first step above with a discharging Δv-t curve obtained in the second step adjacent to its recording sequence, and calculate the charging Δv-t curve t curve and its subsequent discharge Δv-t curve included area s value ", other are the same as embodiment 1.

Embodiment 3

[0061] Except that the third step is changed to "Combine any charging Δv-t curve obtained in the first step above with a discharging Δv-t curve obtained in the second step adjacent to its recording sequence, and calculate each charging Δv-t curve The average of the area s value included between the t curve and its previous discharge Δv-t curve and the area s value included between each charging Δv-t curve and its subsequent discharge Δv-t curve Value ", other is with embodiment 1.

[0062] The acquisition record involved in the above-mentioned embodiment is this lithium battery voltage value v i The equipment and methods involved, and the involved drawing and calculation methods are within the grasp of those skilled in the art.

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Abstract

The invention provides a judgment method for the reason of lithium battery performance degradation, and relates to judgment of battery electrical performance. The steps are that a charge deltav-t curve of a lithium battery is acquired and a discharge deltav-t curve of the lithium battery is acquired; the value of area s included between the charge and discharge deltav-t curves is calculated; and the area s is calculated by using the form of voltage difference and time integration so that the coefficient ki acting as the degree of battery performance degradation is obtained. The reason of lithium battery performance degradation is judged through comparison of the charge deltav-t curves and the discharge deltav-t curves respectively corresponding to different cyclic number of times of charge and discharge of the lithium battery so that the defects in the prior art that the reason of lithium battery performance degradation cannot be judged in the daily use process of the lithium battery can be overcome.

Description

technical field [0001] The technical solution of the present invention relates to the judgment of the electric performance of the battery, specifically a method for judging the cause of the performance degradation of the lithium battery. Background technique [0002] In today's human life and production, batteries are increasingly used in various devices and equipment, among which lithium batteries have occupied an important share in the battery market. Faced with the problem of how to better use lithium batteries, the management technology of lithium batteries has emerged and gradually become a research hotspot, which highlights the research on the reasons for the performance degradation of lithium batteries. [0003] With the recycling of lithium batteries, the performance of lithium batteries will gradually decline, affecting the use and management of lithium batteries. The reasons for the performance decline of lithium batteries include increased internal resistance, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3648
Inventor 杨鹏刘金枝李练兵宣伯凯辛晓博张冬颖
Owner HEBEI UNIV OF TECH
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