SOC correction method and device, battery management system and storage medium

Abstract

The invention discloses an SOC correction method and device, a battery management system and a storage medium. The method comprises the following steps: collecting battery cell state data meeting a preset standing condition; if the length of the voltage data in the battery cell state data is greater than a first preset length and less than a second preset length, and the change value of the voltage data in the battery cell state data is greater than a preset change threshold, determining a first group of to-be-determined parameters of a preset steady-state battery model according to the battery cell state data; predicting a second group of to-be-determined parameters of a preset steady-state battery model according to the first group of to-be-determined parameters; and calculating to obtain a steady-state OCV estimated value according to the second group of undetermined parameters, and determining an SOC correction value corresponding to the steady-state OCV estimated value by utilizing a preset corresponding relationship between steady-state OCV and SOC so as to correct the current SOC. By adopting the embodiment of the invention, the steady-state OCV can be quickly estimated through the characteristics of the external circuit when the battery stands for a short time, and the applicability of an open-circuit voltage method is improved.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to an SOC correction method and device, a battery management system and a storage medium. Background technique [0002] SOC (State of Charge) represents the ratio of the remaining capacity of the battery to the capacity of the fully charged state after it has been used for a period of time or left unused for a long time. When SOC=0, it means that the battery is fully discharged. When SOC=1, it means that the battery is fully charged. . SOC estimation is one of the most important functions of the battery management system, which is used to realize the power indication, remaining mileage, overcharge and overdischarge protection, battery equalization, charging control and battery health prediction of the battery management system. [0003] In the prior art, the open-circuit voltage method is mainly used for SOC estimation, specifically, the steady-state battery SOC (ie, stea...

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Problems solved by technology

[0004] However, the acquisition of steady-state OCV usually requires standing for a long time (more than several hours), and in actual use conditions, the chance of the battery cell standing for a long time is less, so the chance of obtaining steady-state OCV is very small, reducing the The applicability of the open circuit voltage method

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