Secondary Battery Temperature Estimation via Ripple Current Impedance

The patent replaces the physical temperature sensor (mechanical/physical measurement device) with an electrical measurement system that uses voltage and current detectors to measure impedance, which is then correlated to temperature through pre-stored data. This substitution eliminates the need for direct thermal contact sensors and provides more accurate internal temperature measurement.

The patent introduces impedance as an intermediary parameter to indirectly measure temperature. Instead of directly measuring temperature with a sensor, the system measures electrical impedance (through voltage and current detection) and uses pre-stored impedance-temperature correlation data to determine the actual battery temperature, providing more accurate internal temperature information.

The patent makes existing battery management components (voltage detector and current detector) serve multiple functions: they continue to monitor battery status while also providing data for impedance-based temperature measurement. The ripple generating section uses existing power supply circuitry, and the impedance estimating section processes data already being collected by the detection system, thereby avoiding significant additional complexity.

The battery management system performs self-diagnosis by using its own existing measurement infrastructure (voltage and current detectors) to gather data for temperature estimation. The system leverages its inherent electrical measurement capabilities to derive temperature information without requiring external specialized equipment, thereby minimizing additional device complexity.