Method for evaluating battery performance based on Delphi method and grey relation theory

A gray correlation theory and battery performance technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of expanding influencing factors, lack of persuasiveness, and inability to give multiple battery evaluation results completely and accurately, to achieve The effect of a solid theoretical basis

Active Publication Date: 2014-05-14
BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of method has the disadvantage of artificially expanding certain influencing factors,

Method used

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  • Method for evaluating battery performance based on Delphi method and grey relation theory
  • Method for evaluating battery performance based on Delphi method and grey relation theory
  • Method for evaluating battery performance based on Delphi method and grey relation theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Taking a large-capacity lithium iron phosphate battery with a rated capacity of 200Ah as an example, the Delphi method and the gray correlation method model are used in the comprehensive performance evaluation of the battery to evaluate the selected batteries, compare the performance of the four batteries, and rank them.

[0026] 1 Determine the evaluation index and establish the analysis sequence

[0027] For the battery to be evaluated, assuming that there are n influencing factors, there are k batteries participating in the evaluation, and each evaluated battery constitutes a comparison sequence Select the optimal index in each evaluated battery to form a reference sequence

[0028]

[0029] During the use of the power battery, its performance is affected by many factors such as temperature, capacity, and power. The capacity of the battery refers to the amount of electricity the battery can provide under certain discharge conditions. The power performance direct...

Embodiment 2

[0101] Three lithium manganese oxide batteries of the same model and the same batch were used to verify the evaluation method. These three batteries are denoted as B1, B2 and B3 respectively, and the initial capacity is 90Ah. The performance test mentioned in this article is carried out on the battery, and the test results obtained are considered to be the ideal values ​​of the performance parameters of this batch of batteries, as shown in Table 3.

[0102] Table 3 The ideal value of the performance parameters of the test battery

[0103]

[0104] Since this verification is an instant horizontal comparison, it does not consider the self-discharge degree of the battery after standing for many days, so the performance evaluation index of self-discharge rate is artificially ignored. Therefore, the weight of the evaluation index needs to be redistributed, and the Delphi method is still used. The obtained index weight vector (power performance, internal resistance, capacity, po...

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Abstract

The invention relates to a method for evaluating battery performance based on a Delphi method and the grey relation theory. The method comprises the steps of determining evaluation indexes of the battery performance, setting up an analytical sequence, utilizing the Delphi method for determining the weight of factors affecting the battery performance, conducting dimension removal processing on actual values and ideal values of indexes of a battery to be evaluated, determining a reference matrix, setting up a grey relation model of battery comprehensive performance evaluation, obtaining the relation coefficient Xi0i(k) between the kth evaluation index of the ith evaluation object and the reference value according to grey correlation analysis, calculating the relation coefficient, and obtaining the relation degree of the battery according to the grey relation model of the battery comprehensive performance and the weight determined by the Delphi method. According to the technical scheme, a multi-index comprehensive evaluation method is provided for the performance evaluation of the battery, the one-sidedness of serving the single index as the evaluation criterion is overcome, and the reliable evaluation method is provided for the performance evaluation, screening and matching of the battery.

Description

technical field [0001] The invention relates to a comprehensive performance evaluation method of a lithium-ion power battery, in particular to a battery performance evaluation method based on Delphi method and gray relational theory. Background technique [0002] With the vigorous development of electric vehicles and electric energy storage, power batteries are also widely valued as the main power source. However, single cells are limited by their performance and parameters such as voltage, capacity, and power, and often cannot be used alone in electric vehicles, but need to be connected in series and parallel into groups. The grouping of batteries has high requirements on the consistency of the batteries. If single batteries with large differences in performance and parameters are used in groups without reliable screening, the reliability of the batteries will be greatly reduced, the life of the battery pack will be affected, and even the power consumption will be affected....

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 郑方丹孙丙香肖勇孙卫明姜久春张维戈韩志强
Owner BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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