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Lithium battery self-discharge detection method

A detection method and technology for lithium batteries, which are applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of increasing production costs and prolonging battery production cycle, and achieve the effect of improving accuracy, shortening test cycle and reducing cost.

Inactive Publication Date: 2021-08-10
昆山聚创新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A longer standing time can improve the self-discharge battery screening effect, but at the same time it will prolong the battery production cycle and increase production costs

Method used

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  • Lithium battery self-discharge detection method
  • Lithium battery self-discharge detection method
  • Lithium battery self-discharge detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a lithium battery self-discharge detection method, including:

[0055] S100: Take 20 pieces of lithium batteries after capacity division, charge the 20 pieces of lithium batteries after capacity division to a voltage of 3600mV by constant current charging, and then charge them at a constant voltage of 3600mV until the current reaches the preset current to 0.05C.

[0056] S200: Rest all lithium batteries for the first time to eliminate polarization, and the time for the first rest is t 1 For 12h, the voltage of the lithium battery at the end of the first standing is V 1 .

[0057] S300: carry out the second standing for all lithium batteries, the time t of the second standing 2 For 24h, the voltage of the lithium battery at the end of the second standing is V 2 ;

[0058] According to K=(V 1 -V 2 ) / t 2 Calculate the K corresponding to each lithium battery, and calculate the average K based on the K values ​​corresponding to 20 lithium batt...

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Abstract

A lithium battery self-discharge detection method belongs to the technical field of lithium batteries. The lithium battery self-discharge detection method comprises the following steps: (1) charging a plurality of lithium batteries to a preset charge state; (2) standing the plurality of lithium batteries for the first time to eliminate polarization; and (3) carrying out constant-voltage charging on each lithium battery at the voltage V3, measuring the time t3 required for reducing the current to a preset value I0, calculating an average value t3ave and a standard deviation sigma according to the t3 of the plurality of lithium batteries, and judging whether the lithium batteries are self-discharged or not according to the size relationship among the t3, the t3ave and the sigma. The test period can be shortened to reduce the cost, and the accuracy is high.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular, to a method for detecting self-discharge of lithium batteries. Background technique [0002] The self-discharge phenomenon of the battery refers to the phenomenon of spontaneous loss of capacity when the battery is placed in an open circuit, also known as the charge retention capacity. Self-discharge can generally be divided into two types: reversible self-discharge and irreversible self-discharge. The loss of capacity can be reversibly compensated for reversible self-discharge, and the self-discharge of loss of capacity that cannot be compensated is irreversible self-discharge. The reaction caused by the impurities in the liquid, and the irreversible reaction caused by the micro-short circuit caused by the impurities carried in the process. Self-discharge consistency is an important factor affecting the consistency of battery packs. Batteries with inconsisten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382
CPCG01R31/382
Inventor 朱琳李奎姜守钟
Owner 昆山聚创新能源科技有限公司