A method and system for correcting SOC based on ocv curve

Abstract

The present invention relates to a method and system for correcting SOC based on an OCV curve, the method comprising: obtaining the residual SOC value SOC of the battery measured for the nth time n , and according to the SOC n Calculate the current SOC value SOC of the battery for the n+1th time n+1 ; Obtain the current actual voltage value U and the current actual temperature value T of the battery, query in the standard OCV curve database to obtain the standard SOC value SOC corresponding to the battery 标 ; if SOC n+1 with SOC 标 When the difference between them is greater than 5%, the corrected SOC value of the battery is SOC 修 =(SOC n+1 ‑SOC n )*0.1+SOC n . In practical applications, the present invention can effectively correct the SOC value of the battery in real time, so that the SOC value of the battery is closer to the corresponding standard SOC value in the standard OCV curve, improves the overall accuracy of the estimated SOC value, and meets the actual application requirements .

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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