Method and system for correcting SOC based on OCV curve

Abstract

The invention relates to a method and system for correcting an SOC based on an OCV curve. The method comprises a step of obtaining the residual SOC value SOCn of a battery obtained in an nth time, and calculating the current SOC value SOC(n+1) of the battery of an (n+1) time according to the SOCn value, a step of obtaining the current actual voltage value U and the current actual temperature value T of the battery, and inquiring in a standard OCV curve database to obtain a standard SOC value SOC standard corresponding to the battery, wherein if the difference between the SOC(n+1) and the SOC standard is larger than 5%, the corrected SOC value of the battery is SOC correction=(SOC(n+1)-SOCn)*0.1+SOCn. According to the method and the system, the SOC value of the battery can be effectively corrected in real time in actual application such that the SOC value of the battery is more close to the corresponding standard SOC value in the standard OCV curve, the overall precision of an SOC estimation value is improved, and the needs of practical application is satisfied.

Description

technical field [0001] The invention relates to the technical field of battery SOC, in particular to a method and system for correcting SOC based on an OCV curve. Background technique [0002] In the field of electric vehicles, batteries are an extremely important source of power. For automotive batteries, the state of charge (SOC) is an important indicator to measure its performance. Specifically, the state of charge SOC refers to the ratio of the remaining capacity of the battery after it has been used for a period of time or left unused for a long time to its rated capacity when it is fully charged. Wherein, SOC=100% means that the battery is in a fully charged state, and SOC=0% means that the battery is in an empty state. [0003] In practical applications, whether the SOC value of the battery can be accurately estimated has always been an important and difficult issue for researchers in the field of battery management system research. Generally, during the use of the...

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Problems solved by technology

Generally, during the use of the battery, the battery's on or off state, temperature, current value, aging degree, and self-discharge rate will directly affect the estimation of the battery SOC value, so that the estimated value of the battery's SOC is consistent with the standard value when leaving the factory. The SOC values ​​corresponding to the OCV curves are very different. If the SOC estimation value of the above-mentioned car battery is not corrected effectively in time, it will directly affect or even mislead the user's judgment on the current state of the car battery, and reduce the user's actual use experience.

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