Energy storage system battery pack consistency detection method and detection device

Abstract

The invention belongs to the energy storage system detection technical field and relates to an energy storage system battery pack consistency detection method and detection device. The detection method includes the following steps that: the voltage deviation values of each battery cell in each battery pack at each operating time are obtained in real time during the charge and discharge process ofthe battery pack; the voltage deviation values of the battery cells, which are greater than a first threshold value, are put into statistics; and the result of the consistency of the battery pack withother battery packs in an energy storage system is obtained according to the statistics result of the voltage deviation values in the first step or the statistics result of the voltage deviation values in the second step, and the discharge capacity of the battery pack which has been subjected to level guide debugging. According to the energy storage system battery pack consistency detection method and detection device of the invention, the consistency of the battery pack with the other battery packs in the energy storage system is judged according to the statistics result of the voltage deviation values of each battery cell in the battery pack, or the statistics result of the voltage deviation values and the discharge capacity of the battery pack which has been subjected to level guide debugging; and when the consistency is detected, a malfunctioned battery cell can be identified, and the performance status of the battery pack can be understood directly.

Description

technical field [0001] The invention relates to the technical field of energy storage system detection, in particular to a method for detecting the consistency of a battery pack in an energy storage system and a device for detecting the consistency of a battery pack in an energy storage system. Background technique [0002] The energy storage system can regulate the peak and frequency of the conventional power grid, enhance the safe and stable operation of the power grid, and improve the economic operation level of the power system. It is also an important means to realize the smooth fluctuation of renewable energy and promote the large-scale consumption and integration of renewable energy. At the same time, it is an important part of distributed energy systems and smart grid systems, and plays a pivotal role in the energy Internet. [0003] Due to the high energy density and long cycle life of lithium batteries, the voltage of single cells can be increased through series co...

AI Technical Summary

Problems solved by technology

[0025] The disadvantages of the existing technology are: first, after calculating the standard deviation, the calculation of the relationship between dmax and σ assumes that the voltage distribution is a normal distribution, which is not actually a normal distribution; second, the values ​​of σ1, σ2, and σ3 do not give a judgment method , instead of shifting the normal consistency curve, estimating the value of λ, and guessing the evaluation curves of different intervals, which leads to inaccurate judgment of the stage of σ, and the corresponding maintenance plan cannot be accurately proposed; third, because the performance characteristics of the lithium battery have no Reasonable model, this technology uses too many assumptions and calculated values ​​to determine the range of σ, the results obtained will have large deviations, and it is impossible to accurately determine the performance status of the battery pack

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