Shulou(Shulou.com)11/24 Report--

It is reported that in recent years, electric vehicle (EVs), as an environment-friendly vehicle to replace the traditional gasoline internal combustion engine vehicle, is welcomed by more and more users. At the same time, researchers also strengthen the research and development of high-efficiency electric vehicle battery.

However, due to the inaccurate estimation of the battery power, the efficiency of the electric vehicle is low. The battery charging status of the electric vehicle is usually evaluated by the battery output current, which will be used to calculate the remaining mileage of the vehicle.

Generally speaking, the battery current of electric vehicles can reach hundreds of amperes. however, commercial sensors that can detect this current cannot measure small changes in milliampere current, resulting in an uncertainty of about 10% in battery estimation. This means that the mileage of electric vehicles can be extended by 10%. On the contrary, if you improve the accuracy of battery evaluation of electric vehicles, battery utilization will be enhanced.

Fortunately, a team of Japanese scientists have found a solution. They have found a detection technology based on diamond quantum sensors that can estimate battery power with 1% accuracy when measuring the typical high current of an electric vehicle. The study was published in the Sept. 6 issue of the journal Science report.

The research was led by Professor Mutsuko Hatano of the Tokyo Institute of Technology, who explained that the diamond sensor we developed is very sensitive to milliampere current and is compact enough to be used in cars. In addition, we can detect more accurate milliampere current status in the noisy environment of electric vehicles.

In this study, the researchers developed a prototype sensor that uses two diamond quantum sensors placed on both sides of the car bus (electrical contacts for input and output currents). They use a technique called "differential detection" to eliminate common noise detected by the two sensors, retaining only the actual signal, and vice versa Using this diamond quantum sensor, a small current of 10 Ma can be detected in the background noise.

Next, the team of scientists used the analog-digital hybrid control of the frequency generated by two microwave generators to track and analyze the magnetic resonance frequency of the quantum sensor within 1 gigahertz bandwidth. it is found that the magnetic resonance frequency can achieve a large dynamic range of ±1000 A (the ratio of the maximum current to the minimum current). In addition, the sensor has a wide operating temperature range from minus 40 degrees Celsius to 85 degrees Celsius. Suitable for the temperature range of ordinary vehicles.

Finally, the research team conducted a globally coordinated Light vehicle Test cycle (WLTC) driving test on the prototype, which is a standard test for the energy consumption of electric vehicles. The sensor can accurately track the charge and discharge current of-50 A to 130 A, and the accuracy of battery charge estimation is less than 1%.

Professor Mutsuko Hatano says what do these findings mean? For every 10% increase in battery utilization, the battery weight will be reduced by 10%, which will reduce the operating energy consumption of 20 million new electric vehicles by 3.5% and production energy by 5% in 2030, which is equivalent to a 0.2% reduction in global transportation carbon dioxide emissions in 2030.

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