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

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...

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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 hold for a long time under the condition of 20-70°C, which improves the aging of the battery. The safety of the process; the patent ZL200510036994.3 "A Lithium-ion Battery Cell Aging Method", which enables the battery to be fully charged and at room temperature for a long time, and the voltage drop is obvious and it is easy to pick out the self-discharging cell

Earlier patents described different lithium-ion aging schemes, but there were few studies on predicting and evaluating the effectiveness of aging schemes

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