Vehicle power battery SOC value reporting method and device and battery management system

Abstract

The invention provides a vehicle power battery SOC value reporting method and device and a battery management system. The method comprises the steps that firstly, an SOC value B of a power battery at the current moment is estimated; secondly, the difference value n% between the SOC value B estimated at the current moment and an SOC value A reported to a vehicle controller at the previous moment is calculated; thirdly, whether the absolute value of the difference value n% is larger than a preset jumping limiting value x% or not is judged, wherein the preset jumping limiting value x% is larger than zero, the SOC value B at the current moment is directly reported to the vehicle controller if the absolute value of the difference value n% is smaller than or equal to the preset jumping limiting value x%, and the next step is executed if the absolute value of the difference value n% is larger than the preset jumping limiting value x%; fourthly, whether the difference value n% is larger than zero or not is judged, if the difference value n% is larger than zero, the SOC value at the current moment is reported to the vehicle controller with B+x%, and if the difference value n% is smaller than or equal to zero, the SOC value at the current moment is reported to the vehicle controller with B-x%.

Description

technical field [0001] The invention relates to the technical field of vehicle power battery management, in particular to a method, device and battery management system for reporting the SOC value of a vehicle power battery. Background technique [0002] SOC (State of charge), that is, the state of charge, is used to reflect the remaining capacity of the battery, and its value (SOC value) is defined as the ratio of the remaining capacity of the battery to the rated capacity of the battery. [0003] In a pure electric vehicle or a hybrid vehicle, the vehicle controller distributes the torque based on the reported SOC value and the driver's driving demand, and sends corresponding instructions to the motor controller. Drivers and passengers can know the cruising range of pure electric vehicles through the SOC value. [0004] The existing SOC value reporting method is that after the battery management system estimates the SOC value of the power battery, it directly reports the ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for reporting the SOC value of a vehicle power battery in view of the defect that the existing vehicle power battery SOC value reporting method is likely to cause a large jump in the reported SOC value compared with the previous time

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