Method for optimizing consistency of battery module

Abstract

The invention discloses a method for optimizing consistency of a battery module. The method comprises the steps of: performing charge and discharge operation on a battery module based on the limited voltage information of a preset battery module to obtain charge and discharge operation data; performing determination according to the charge discharge operation data and a preset charge-discharge standard dropout voltage; selecting a corresponding adjustment operation strategy in a preset first optimization strategy according to the operation determination result, and performing SOC (State Of Charge) adjustment optimization on the single battery cell of the battery module; and determining the type of the battery module according to the charge and discharge operation data, selecting a corresponding balance operation strategy in a preset second optimization strategy according to the obtained module type information through determination, and performing charging and discharging balance optimization on the battery module. According to the invention, SOC adjustment optimization and charge-discharge balance optimization are utilized without damaging of the battery consistency so as to effectively solve the limitation of the single battery cell of the laggard battery on the service life of the battery module; and repeated circulating charge and discharge balance optimization is not needed so that the optimization efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for optimizing the consistency of battery modules. Background technique [0002] In the production process of lithium-ion batteries, due to the inconsistency of raw materials, processes and other factors, there are inevitably differences in the individual cells of the produced lithium-ion batteries. In addition, during the use of lithium-ion battery modules, each lithium-ion There are also differences in the heat dissipation, charging and discharging of the single cells of the battery, which leads to the consistency problem between the single cells of the lithium-ion battery. In lithium-ion battery modules, the cycle life of battery modules with poor consistency is far lower than the cycle life of single cells. Charging or over-discharging behavior, and this behavior has a fatal impact on the cycle life and safety performance of the battery module. The life of a singl...

AI Technical Summary

Problems solved by technology

Therefore, for the battery modules equipped with the single cells of the same batch of batteries, a set of equalization strategies cannot well solve the restriction on the life of the battery modules by the single cells of the backward batteries.

Moreover, it is necessary to perform multiple cycles of charging and discharging equalization optimization on the battery module to achieve the desired effect, resulting in low optimization efficiency

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