A method for evaluating the storage life of a lithium-ion battery with a full charge

Abstract

The invention discloses a lithium-ion battery full-charge storage life evaluation method, the steps include: storing a battery sample for evaluating the full-charge state of the lithium-ion battery at a plurality of storage temperature values ​​T for a specified sampling time t to obtain a capacity loss rate Q and Generate experimental data; establish a capacity decay aging model, determine the value of model parameter ρ and model parameter a; judge the rationality of the selection of storage temperature range based on whether the model parameter a satisfies the Arrhenius formula at each storage temperature value T; Statistically obtain the mean and standard deviation of the model parameters A and B; substitute the value of the model parameter ρ and the mean of the model parameters A and B into the model to judge the goodness of fit; after the goodness of fit is satisfied, the lithium-ion battery to be evaluated is The lifetime at normal temperature is predicted to obtain the lifetime distribution map. The invention has the advantages of sufficient life evaluation principle, high data reliability and high precision, simple operation, easy realization, short evaluation time and wide application range.

Description

technical field [0001] The invention relates to the storage life evaluation technology of lithium-ion batteries, in particular to a method for evaluating the full-charge storage life of lithium-ion batteries using high-temperature acceleration. Background technique [0002] With the development of society and the advancement of science and technology, lithium-ion batteries have been widely used as a new generation of energy systems. As a power source, lithium-ion batteries have the advantages of high safety and no pollution compared with traditional oil-based power sources, making lithium batteries have great application prospects in vehicle power supplies. At present, pure electric vehicles based on lithium batteries have been successfully produced at home and abroad and have widely sold. [0003] However, the lifespan of lithium-ion batteries is one of the biggest constraints limiting their widespread application. Typically, the end of life of a battery is defined as 80%...

AI Technical Summary

Problems solved by technology

The rule of thumb is based on experience, and it is proposed that on the basis of meeting certain conditions, the storage temperature of the battery increases by 10°C, and the capacity decay rate of the battery increases by about one time. This method can simply estimate the full charge storage of lithium-ion batteries. However, the reliability of the data is not high, and there are shortcomings such as low accuracy and long evaluation time

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