Switching power supply is the main power supply of today's information equipment, making an indelible contribution to the miniaturization and portability of electronic equipment. Switching power supplies continue to be miniaturized, lightweight, and highly efficient, and are used more and more in electronic equipment, and their penetration rate is getting higher and higher. Correspondingly, electrolytic capacitors are required to be small and large-capacity, ripple current resistant, high frequency and low impedance, high temperature and long life, and more suitable for high density assembly.