Hard state Electrolytic copper foil It is an important material for manufacturing copper clad plate (CCL), printed circuit board (PCB) and lithium-ion battery. In today's rapid development of electronic information industry, electrolytic copper foil is called the "neural network" of electronic product signal and power transmission and communication. Since 2002, the production value of printed circuit boards in China has become the third largest in the world. As the substrate material of PCB, copper clad laminate has also become the third largest producer in the world. As a result, China's electrolytic copper foil industry has developed by leaps and bounds in recent years.