Charging is not afraid of fire: Stanford develops a new battery to automatically shut off the power

Stanford develops batteries that automatically shut off

Beijing time January 12 news, researchers at Stanford University recently developed a new type of lithium battery, when the battery overheats, it will automatically shut down once installed in electronic devices, such as hoverboards, notebooks and mobile phones, equipment There will be no hidden danger of fire.

Lithium batteries are widely used in various types of portable electronic devices, and they are not only portable, but also can store a large amount of electric energy and can be easily replaced. The disadvantage is that the batteries are prone to overheating when damaged. A short circuit inside the battery can also cause a fire.

Professor Stanford who develops batteries

In the new battery developed by Stanford, the researchers used a polyethylene film material with nickel magnetic powder embedded in the film, which forms nano-sized protrusions. Researchers covered graphene conductive materials on the protrusions, allowing current to pass through the surface. When the temperature rises, the film expands and when the temperature rises to 70 degrees Celsius, the protruding parts will no longer be connected to each other, the circuit will be disconnected and the battery will shut down. A power failure can prevent the battery from overheating, then the battery will become cold and the nickel bumps will connect again, continuing to let the battery pass.

One of the Stanford research team and professor of chemical engineering, Zhenan Bao, said: "We can adjust the temperature level by changing the number of embedded particles. It can be achieved by using different types of polyethylene film. ”

Also involved in the study were Yi Cui, Associate Professor of Stanford Chinese, and Zheng Chen, a postdoctoral fellow. Cui Wei said: "Compared with the previous method, our design is more reliable, faster, and more reversible, it can not only ensure that the performance of the battery does not decline, but also improve the security."

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