Battery characteristic parameter extraction method and device, computer equipment and storage medium

Abstract

The invention discloses a battery characteristic parameter extraction method and device, computer equipment and a storage medium. The battery characteristic parameter extraction method comprises the following steps: dividing a charge-discharge curve of a positive electrode half battery and a charge-discharge curve of a negative electrode half battery respectively to obtain phase change reaction intervals of the charge-discharge curve of the positive electrode half battery and the charge-discharge curve of the negative electrode half battery in different SOC intervals; according to the phase change reaction intervals of the charge-discharge curve of the positive electrode half battery and the charge-discharge curve of the negative electrode half battery in the different SOC intervals, carrying out characteristic region division on a differential voltage curve of a total battery to obtain characteristic parameters of the differential voltage curve of the total battery; obtaining a full-battery characteristic capacity increment curve according to a conversion relation between the capacity increment curve and the differential voltage and the characteristic parameters of the full-battery differential voltage curve; and extracting recession characteristic parameters of the whole battery according to the characteristic capacity increment curve of the whole battery. A technical problemthat an existing method cannot reflect a chemical reaction of the battery is solved.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, in particular to a method, device, computer equipment and storage medium for extracting battery characteristic parameters. Background technique [0002] In recent years, with the implementation of policies to encourage the development of new energy vehicles in various countries, power lithium-ion batteries and related industries have ushered in vigorous development, power lithium-ion battery related technologies have also been continuously innovated, and its safety and reliability have also triggered widespread attention in the field. The vehicle performance of an energy vehicle largely depends on the performance of the on-board power battery system. Compared with other types of batteries, lithium-ion batteries have the advantages of high specific energy, long service life, low price, and superior high and low temperature performance. As the core energy source of electric v...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a battery characteristic parameter extraction method, device, computer equipment and storage medium, aiming to solve the technical problem that the existing characteristic parameter extraction method cannot intuitively reflect the internal chemical reaction of the battery

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