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: collecting cell state data satisfying preset static conditions; if the length of voltage data in the cell state data is greater than the first preset length and smaller than the second preset length, and the voltage data in the cell state data The change value is greater than the preset change threshold, then determine the first set of undetermined parameters of the preset steady-state battery model according to the battery state data; predict the second set of undetermined parameters of the preset steady-state battery model according to the first set of undetermined parameters Parameters: According to the second set of undetermined parameters, calculate the estimated steady-state OCV value, and use the preset corresponding relationship between steady-state OCV and SOC to determine the SOC correction value corresponding to the steady-state OCV estimated value to correct the current SOC . By adopting the embodiment of the present invention, the steady-state OCV can be quickly estimated through the characteristics of the external circuit when the battery is left standing for a short time, and the applicability of the open-circuit voltage method can be 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 to estimate the SOC, specifically, the battery SOC in a steady state (ie...

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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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