Scientists from the Tokyo Institute of Technology have figured out how to increase the efficiency of use
Battery currents in electric vehicles canreach hundreds of amperes, scientists explain. Commercial sensors that can detect such currents cannot measure small current changes at the milliamp level. This results in an uncertainty of about 10% in the estimated remaining battery charge. This means that the car needs to be recharged 10% earlier.
Physicists have created a sensor prototype using twodiamond quantum sensors that were placed on either side of the busbar (the electrical connection for incoming and outgoing current) in the car. With the help of "differential detection" technology, the scientists suppressed the noise and retained only the actual signal. This approach made it possible to detect a small current of 10 mA against background environmental noise.
Quantum sensor device. Image: Yuji Hatano et al., Scientific Reports
The scientists then used a mixedanalog-to-digital control of the frequencies generated by two microwave oscillators to track the magnetic resonance frequencies of the quantum sensor over a 1 GHz bandwidth. With this approach, the sensor can operate over a wide range of currents, detecting both small and large values.
An experimental study when installing the sensor in a real electric vehicle using a standard battery test showed that the sensor detects the remaining charge with an accuracy of 1%.
Researchers note that ineffectiveThe use of batteries in electric vehicles not only reduces the charge and requires more frequent recharging, but also increases the burden on the environment. The use of new measurement technology can help reduce emissions associated with energy overruns and overproduction.
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