Battery Current Correction Using Dual SOC Estimation

The patent combines two different SOC estimation methods: current integration method and voltage-based method. The correction device calculates a correction value based on the difference between SOC values obtained from both methods, then applies this correction to the current integration results. This merging approach allows continuous monitoring while periodically correcting accumulated errors, thus maintaining both continuous operation and high accuracy.

The patent implements a feedback mechanism where the voltage-based SOC estimation serves as a reference to correct the current integration-based SOC estimation. The correction device continuously monitors the difference between the two SOC values and applies real-time correction to the measured current values, creating a closed-loop system that maintains accuracy over time.

The patent introduces voltage-based SOC estimation as an intermediary reference to correct current measurement errors. Instead of directly measuring and correcting sensor errors, the system uses the voltage-based method as a mediator to calculate the difference, then applies this difference as a correction value to the current measurements. This allows error correction without requiring the battery to be in a no-current state.

The patent changes the approach from directly correcting current sensor parameters (gain and offset) to correcting the SOC estimation parameter using voltage-based reference. By transforming the problem from sensor-level correction to system-level SOC correction, the patent enables error compensation under normal operating conditions without requiring specific calibration states.