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 includes: obtaining battery cell state data when the battery cell meets preset static conditions; The steady-state battery model of the open-circuit voltage OCV changing with time in the steady state, and the steady-state time threshold used to characterize whether the resting time is sufficient; the steady-state battery model is used to process the steady-state time threshold to obtain the steady-state OCV estimated value; Using the preset corresponding relationship between the steady-state OCV and the SOC, the SOC corresponding to the steady-state OCV estimated value is determined; the current SOC is corrected by using the SOC corresponding to the steady-state OCV estimated value. By adopting the embodiments of the present invention, the steady-state OCV can be quickly estimated by the external circuit characteristics when the battery is left standing for a short time, and the applicability of the 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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