Germany adopts non-contact method to detect internal defects of the battery, which can promote the battery

Rechargeable batteries are the core of many new technologies and can be used to increase the use of renewable energy. More precisely, it can be used to power electric cars, mobile phones and laptops.

According to foreign media reports, scientists at the Helmholtz Institute of Johannes Gutenberg University Mainz (JGU) in Germany have proposed a non-contact method that can be used to detect the state of charge and all defects of lithium-ion batteries, and Use an atomic magnetometer to measure the magnetic field around the battery. Professor Dmitry Budker and his team usually use atomic magnetism to explore basic problems in physics, such as finding new particles. Magnetism is a term used to describe the measurement of magnetic fields. A simple application that uses this science is the compass. The earth’s magnetic field will keep the compass pointing to the north.


(Source: University of Mainz)

At present, the demand for high-capacity rechargeable batteries is growing, so a sensitive and accurate diagnostic technique is needed to determine the status of the battery. The success of many new studies will depend on the ability to produce batteries with sufficient capacity and long life. Dr. Arne Wickenbroc, a member of the working group of the JGU Department of Physics and the Helmholtz Institute, said: "Guarantee the quality of rechargeable batteries is a major challenge, and non-contact measurement methods can provide new inspiration for improving batteries." Using atomic magnetometer to measure the battery, and made breakthrough progress.

Dr. Wickenbrock said: "Our method is the same as magnetic resonance imaging, but it is simpler because we use an atomic magnetometer." The atomic magnetometer is an optical pump magnetometer that uses gaseous atoms as magnetic field probes. Such equipment is already commercially available and can be used for industrial applications and basic research. Budker's group is also independently developing advanced magnetic field sensors, using this type of atomic magnetometer for basic physics research, such as studying dark matter, and trying to solve the mystery why matter and antimatter have not eliminated each other after the Big Bang.

In the field of battery measurement, the battery is placed in the background magnetic field. The battery changes the background magnetic field, which can be measured using an atomic magnetometer. Wickenbrock added: "This change provides us with information about the battery charge status, remaining battery capacity and possible damage. The measurement process is very fast and can be easily integrated into the production process." There have been many explosions related to e-cigarettes before Reports of serious injuries, and the prohibition of carrying certain types of mobile phones while boarding the plane, have also emerged, indicating that it is necessary to detect defects in the battery. (Yu Qiuyun)

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