Battery state-of-charge correction method, device and system and storage medium

Abstract

The invention discloses a battery state-of-charge correction method, device and system and a storage medium. The method comprises the following steps: determining a current open-circuit voltage measurement value of a battery, and determining whether the current open-circuit voltage measurement value is in a hysteresis voltage interval or not; when the current open-circuit voltage measurement valueis in the hysteresis voltage interval, determining a charging state-of-charge value corresponding to the current open-circuit voltage measurement value in a charging state and a discharging state-of-charge value corresponding to the current open-circuit voltage measurement value in a discharging state; and based on a state-of-charge credible interval formed by the charging state-of-charge value and the discharging state-of-charge value, determining a state-of-charge correction target value, and correcting the current state-of-charge of the battery. According to the method provided by the embodiment of the invention, the state-of-charge of the battery with hysteretic characteristics is corrected, and the accuracy of estimating the state-of-charge value of the battery is improved.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a method, device, system and storage medium for correcting the state of charge of batteries. Background technique [0002] In the battery management system of electric vehicles, the State of Charge (SOC) of the battery is used to reflect the remaining capacity of the battery, and SOC is also an important factor for battery capabilities such as balanced control technology, rapid charge and discharge management, and safe operation. parameter. Therefore, accurate SOC estimation plays an important role in realizing the battery management system's power indication, remaining mileage, overcharge and overdischarge protection, battery balancing, charging control, and battery health prediction. [0003] Currently commonly used SOC correction methods, such as the open-circuit voltage method, can use the corresponding relationship between the open-circuit voltage (Open-Circuit Vo...

AI Technical Summary

Problems solved by technology

However, for the cell system with hysteresis characteristics, the OCV curve representing the correspondence between OCV and SOC is affected by historical working conditions, and changes in the OCV curve will lead to large errors in the open circuit voltage method, reducing the accuracy of correcting SOC. sex

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