High-Accuracy Electric Vehicle Battery Monitoring with Diamond Quantum Sensors for Driving Range Extension Towards carbon neutrality
, the team has reported a diamond quantum sensor-based detection technique that can estimate the battery charge within 1% accuracy while measuring high currents typical of EVs.
measured currents in a wide range as well as detected milliampere-level currents in a noisy environment,” explains Prof. Hatano. Next, the team used a mixed analog-digital control of the frequencies generated by two microwave generators to trace the magnetic resonance frequencies of the quantum sensor over a bandwidth of 1 gigahertz. This allowed for a large dynamic range of ±1000 A. Moreover, a wide operating temperature range of −40 to +85 °C was confirmed to cover general vehicular applications.
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