Method for designing lithium ion battery aging scheme and predicting effectiveness of scheme

A lithium-ion battery, effective technology, applied in the field of lithium-ion batteries, can solve the problems of long aging time, less research on the effectiveness of aging schemes, poor battery performance, etc., to achieve short aging cycle, long improvement time, targeted strong effect

Pending Publication Date: 2018-08-17
ZHENGZHOU BAK BATTERY CO LTD
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Problems solved by technology

[0003] Patent CN 103985911 A proposes a method of statically aging lithium-ion batteries under high and low temperature conditions, which improves the adaptability of batteries in high and low temperature environments, and overcomes the long aging time and poor performance of batteries after aging in conventional lithium-ion battery aging methods Shortcomings; Patent CN 102646852 A "A Lithium-ion Battery Aging Method", which charges the lithium-ion battery to its 0%-10% SOC state, and puts the aging battery on

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  • Method for designing lithium ion battery aging scheme and predicting effectiveness of scheme
  • Method for designing lithium ion battery aging scheme and predicting effectiveness of scheme
  • Method for designing lithium ion battery aging scheme and predicting effectiveness of scheme

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Embodiment 1

[0028] This embodiment provides a scheme for designing lithium-ion battery aging and a method for predicting its effectiveness, as follows:

[0029] (1) Choose a ternary cylindrical lithium-ion battery with a nominal voltage of 4.2V and a capacity of 2400mAh. Determine the battery pre-charge cut-off voltage before aging:

[0030] (a) Discharge the battery with a small current at the sub-capacity temperature, that is, 28°C, to the termination voltage required by the battery model, and record the discharge platform of the battery, such as figure 1 According to the 0.01C discharge curve of the ternary cylindrical lithium-ion battery, it can be determined that the discharge platform of the lithium-ion battery is about 3600mV, and the discharge platform is 50mV above the interval, and 3650-3850mV is selected as the pre-charge cut-off voltage range of the lithium-ion battery before aging;

[0031] (b) In order to shorten the aging time and form a good SEI film, at the aging temperat...

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Abstract

The invention provides a method for designing a lithium ion battery aging scheme and predicting the effectiveness of the scheme. The method includes the steps of firstly, determining the precharge cut-off voltage of a battery before aging; secondly, manufacturing a seed cell to perform aging, selecting self-discharge, and verifying the aging scheme; thirdly, performing EIS and SEM tests to predictthe advantages and disadvantages of the aging scheme. The method has the advantages that semi-electrical aging is adopted, and high safety and short aging cycle are achieved; the method for predicting and verifying the effectiveness of the aging scheme is highly targeted, simple, effective, capable of verifying the effectiveness without using a large number of cells and capable of simplifying thework flow; the defect that a method using circulating testing results to show the advantages and disadvantages of the aging scheme is high in time consumption is improved, and work efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a scheme for designing lithium-ion battery aging and a method for predicting its effectiveness. Background technique [0002] With the development of society and the improvement of people's requirements for environmental protection, lithium-ion batteries are more and more used in people's lives as a new energy source. Cycle performance and performance consistency are important indicators for evaluating lithium-ion batteries, and these indicators are affected by the aging process in the manufacturing process of lithium-ion batteries. [0003] Patent CN 103985911 A proposes a method of statically aging lithium-ion batteries under high and low temperature conditions, which improves the adaptability of batteries in high and low temperature environments, and overcomes the long aging time and poor performance of batteries after aging in conventional lithium-ion battery ag...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48H01M10/44H01M10/0525
CPCH01M10/0525H01M10/4285H01M10/44H01M10/48Y02E60/10
Inventor 孟玉珠张同富黄和
Owner ZHENGZHOU BAK BATTERY CO LTD
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