Evaluation method and evaluation system for evaluating performance of high-capacity battery energy storage system

Abstract

The invention provides an evaluation method and an evaluation system for evaluating the performance of a high-capacity battery energy storage system. The method for evaluating the performance of the high-capacity battery energy storage system comprises the steps of sequentially evaluating the performance of each battery pack in the energy storage system, and then performing corresponding debugging on the battery pack according to the evaluation result, wherein the performance evaluation of the battery pack is determined with a fuzzy relation matrix established according to grade and evaluation indexes and the weight of each evaluation index as a maximum membership degree. The evaluation system comprises a data acquisition module, a performance index calculation module, a fuzzy relation matrix calculation module and an evaluation matrix calculation module which are connected in sequence. Compared with the prior art, based on the evaluation method and the evaluation system, the consistency performance of the high-capacity battery energy storage system is comprehensively evaluated. Evaluation data are derived from the historical operating data of a battery during operation. The normal operation of the battery energy storage system is not influenced at all. Meanwhile, the implementation is convenient, and the flexibility is high.

Description

technical field [0001] The invention relates to the field of energy storage systems, in particular to a method and system for evaluating the performance of a large-capacity battery energy storage system. Background technique [0002] With the development of battery technology, battery systems are increasingly used in electric vehicles, energy storage and other fields. Large-capacity battery energy storage systems need to group single batteries in series and parallel to meet the required capacity requirements. During the long-term charging and discharging process, due to the differences in the self-discharge rate and capacity decay rate of each single battery, it is easy to cause the dispersion between the battery cells in the battery energy storage system to increase, which will affect the battery energy storage system. normal use. Therefore, for a battery pack, the performance of the battery is critical to the use of the battery energy storage system. [0003] At present...

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Problems solved by technology

[0003] At present, there are many researches on battery performance evaluation in terms of battery charge and discharge performance, cycle performance, high and low temperature discharge performance, battery capacity, internal resistance, consistency, etc. Generally, it is necessary to do a special test on the battery to obtain the data used for evaluation. Suitable for large-capacity battery energy storage systems running in groups

Moreover, there are relatively few studies on the performance evaluation of battery energy storage systems.

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