Optimization method for consistency of battery modules

Abstract

The invention discloses a method for optimizing the consistency of a battery module. Based on the limited voltage information of the preset battery module, the battery module is charged and discharged to obtain charging and discharging operation data; according to the charging and discharging operation data and the preset charging and discharging Determine the standard pressure difference; select the corresponding adjustment operation strategy in the preset first optimization strategy according to the operation judgment result, and adjust and optimize the SOC of the single cell of the battery module; adjust the type of the battery module according to the charging and discharging operation data A determination is made, and a corresponding equalization operation strategy in the preset second optimization strategy is selected according to the determined module category information to perform charge and discharge balance optimization on the battery module. The present invention utilizes SOC adjustment optimization and charge-discharge balance optimization without destroying the consistency of the battery, thus effectively solving the restriction of battery module life by single cells of outdated batteries; and does not require multiple cycles of charge-discharge balance optimization, thereby Improve optimization efficiency.

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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