Battery health evaluation model construction method, evaluation method and devices

Abstract

The invention relates to a battery health evaluation model construction method, an evaluation method and devices. The method comprises the steps of: obtaining the effective travel in the working cycleof a battery to be detected; determining a segment health estimation value of each working segment; determining a standard correction coefficient corresponding to the cycle type; on the basis of thestandard correction coefficient, correcting the segment health estimation value corresponding to the cycle type, so that the corrected segment health estimation value is obtained; obtaining the firstaverage value of all segment health standard values in each working cycle as the cycle health estimation value of each working cycle; fitting the cycle health estimation value with the cycle time corresponding to each cycle health estimation value, so that a battery health standard model corresponding to the cycle type is obtained; and, on the basis of a pre-set environment correction function, correcting the battery health standard model. Real-time online health state evaluation of a power battery is realized; an evaluation result is provided for a user at any time; a use place is not limited; and the practicability is relatively high.

Description

technical field [0001] The invention relates to the technical field of battery performance evaluation and prediction, in particular to a construction method, evaluation method and device for a battery health degree evaluation model. Background technique [0002] In recent years, the new energy automobile industry has developed rapidly and experienced explosive growth. As the power system of a car, the health of the power battery is an important factor affecting the service life of a new energy electric vehicle. Therefore, the health status of the power battery has become the most concerned issue for car owners. [0003] In the prior art, battery health status is evaluated by parameters such as internal resistance, capacity, charge-discharge rate, and cycle times. The commonly used evaluation method is physical offline test method. The physical off-line test method is mainly to place the power battery in a set test program under a stable condition, conduct physical experime...

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a method for constructing a battery health evaluation model, an evaluation method and a device, so as to overcome the current inability to obtain the health status of the battery online in real time, the place of use is relatively limited, and the practicability is not high. The problem

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