US 12,283,437 B2
Electrolytic capacitor
Takashi Takezawa, Shijonawate (JP); Masakazu Hosogi, Shijonawate (JP); and Hirokazu Nishikori, Shijonawate (JP)
Assigned to SUN Electronic Industries Corp., Shijonawate (JP)
Filed by SUN Electronic Industries Corp., Shijonawate (JP)
Filed on Jan. 12, 2024, as Appl. No. 18/411,285.
Application 18/411,285 is a continuation of application No. 17/642,164, granted, now 11,915,887, previously published as PCT/JP2020/028979, filed on Jul. 29, 2020.
Claims priority of application No. PCT/JP2019/036149 (WO), filed on Sep. 13, 2019.
Prior Publication US 2024/0194415 A1, Jun. 13, 2024
Int. Cl. H01G 9/145 (2006.01); H01G 9/02 (2006.01); H01G 9/035 (2006.01); H01G 9/048 (2006.01); H01G 9/10 (2006.01)
CPC H01G 9/145 (2013.01) [H01G 9/02 (2013.01); H01G 9/035 (2013.01); H01G 9/048 (2013.01); H01G 9/10 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of preventing oxidation-induced deterioration of a sealing member in a capacitor including:
a capacitor element holding a predetermined solution between an anode foil and a cathode foil that are wound up with a separator in between;
a body case for housing the capacitor element; and
the sealing member for sealing the body case,
wherein
the solution contains, dissolved in a lipophilic solvent, a sealing member deterioration preventing agent that solidifies by oxidation, the solution being supplied through the separator to the sealing member, and
the sealing member deterioration preventing agent permeates the sealing member and reaches an outer face of the sealing member to form on the outer face of the sealing member a coating resulting from the sealing member deterioration preventing agent solidifying, thereby preventing oxidation-induced deterioration of the sealing member, and
the SP value of the sealing member deterioration preventing agent falls between the SP value of the lipophilic solvent and the SP value of the sealing member.