MLCC (multilayer ceramic capacitors) acts as a "dam" for quantitative transmission of electricity after power storage, regulating the quantitative transmission of current in the circuit and preventing electromagnetic wave interference between components. The thickness is 0.3mm, which is only 1 / 250 of a grain of rice. In such a thin thickness, only by realizing thin multi-layer stacking as far as possible, can more electricity be stored. Therefore, this is a very important part of technical capacity.