What is the role of the diaphragm inside the lithium battery?

The diaphragm is of course to separate the positive and negative materials, one side of the copper foil coated with negative material, aluminum foil coated with positive material. The positive and negative electrode are separated by a diaphragm, and the positive and negative electrode materials penetrate the diaphragm to discharge. At present, basically all of them are imported. Domestic ones are said to be not too mature. It belongs to polymer material. It should be a bit of science and technology. This diaphragm is very important, once the impurities or what hard objects pierced, the battery is equivalent to a short circuit, it is likely to be bulging. It is the so-called flatulence. Big belly