Capacitors are used in AC circuits and pulse circuits. In DC circuits, capacitors generally play the role of blocking DC.

The endless incidents of electric vehicles burning cars and everyone's concerns about the battery of the energy storage system point directly to the two most important application scenarios to be solved, that is, electric vehicles and energy storage systems. And this is also the application scenario where solid-state batteries have the most chance to win.

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With the rapid development of science and technology, the imminent depletion of fossil fuels and the increasingly serious environmental pollution caused by the improvement of living standards, all countries attach great importance to the development of renewable and sustainable clean energy from the sun and wind. However, for these intermittent renewable clean energy sources, good energy storage systems and devices are very important. Based on mass production and environmental protection and green concepts, the new generation of energy storage devices must meet the requirements of low-cost manufacturing process, low-polluting and recyclable materials, safe device operation, and long service life.

The AC voltage is stepped down to the proper AC voltage through a transformer.