A battery SOC calibration method, device and storage medium

Abstract

The present invention proposes a battery SOC calibration method, which includes the following steps: S1, power on the system, read the storage time and the stored SOC value in the readable memory, and judge whether the resting time meets the threshold value, and if so, judge whether there is a platform area , if it exists, start the OCV-SOC look-up table calibration, and then proceed to step S2, otherwise directly proceed to step S2; S2, determine whether it is the charging mode, if so, the maximum cell temperature, the minimum cell temperature, the charging method, and read the current SOC value, charging current, charging time and the highest charging cell voltage, then go to step S3, if not, go to S2; S3, judge and calibrate the Dq / Dv relationship; S4, calibrate the static voltage slope; S5, go to the charging terminal voltage calibration. The present invention performs SOC calibration through three methods of Dq / Dv relationship during charging, charging terminal voltage, and static voltage slope judgment, avoiding calibration errors caused by the platform area of ​​the battery, and is suitable for SOC calibration of different types of batteries.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a battery SOC calibration method, device and storage medium. Background technique [0002] As the market has higher and higher requirements for new energy vehicles, energy storage, and 3C electronic products, batteries, as one of the key components, have attracted much attention. SOC (State of Charge, state of charge) estimation is one of the key technologies of battery management. It is used to determine the remaining state of charge of the battery. Inaccurate estimation of its value may easily cause battery overcharge, overdischarge, and reduce battery life. [0003] The SOC estimation accuracy is mainly affected by two aspects, one is the SOC process calculation accuracy, and the other is the SOC calibration accuracy. The calculation accuracy of SOC process can be improved by increasing the acquisition accuracy and calculation algorithm of voltage, current and tempe...

AI Technical Summary

Problems solved by technology

This method is not suitable for batteries with a platform voltage range, such as lithium iron phosphate batteries, which may easily cause large calibration errors due to factors such as the accuracy of the OCV-SOC relationship table and the acquisition voltage and temperature.

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