Battery pack consistency evaluation method and battery pack equalization strategy

Abstract

The invention relates to a battery pack consistency evaluation method and a battery pack equalization strategy. According to the battery pack consistency evaluation method, a relational graph of an initial rated capacity and an initial dischargeable amount of each to-be-tested battery cell can be established through obtaining the initial rated capacity and the initial dischargeable amount after ato-be-tested battery pack undergoes a charge / discharge cycle. After the to-be-tested battery pack is put into use, a relational graph of an actual rated capacity and an actual dischargeable amount canbe established at any time. Furthermore, key battery cell information in the two relational graphs is respectively obtained, so that an initial battery cell distribution area and an actual battery cell distribution area of the to-be-tested battery pack can be divided to obtain quantitative indexes of consistency evaluation, namely, the areas of the battery cell distribution areas. The battery pack consistency evaluation method provided by the invention is simple to operate, less in data acquisition and simple in calculation process, and can realize intuitive evaluation and quantitative evaluation of battery pack consistency.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a battery pack consistency evaluation method and a battery pack equalization strategy. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. Lithium-ion batteries have the advantages of low self-charging rate, wide working range (can work in the temperature range of -25°C to 50°C), no memory effect, environmental friendliness and long life, etc., and gradually become the vehicle power battery for pure electric vehicles mainstream. Limited by the capacity and voltage level of lithium-ion battery cells, lithium-ion battery cells cannot be directly used to drive electric vehicles. Hundreds of lithium-ion battery cells need to be connected in series and parallel to form a lithium-ion battery pack with a suitable capacity and...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a battery pack consistency evaluation method and a battery pack balancing strategy in view of the problem that in the traditional solution, the battery pack consistency evaluation method needs to collect battery data of all battery cells in the battery pack, resulting in a long time-consuming problem.

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