US 12,406,814 B2
Solid electrolytic capacitor element, solid electrolytic capacitor and method for producing same
Tomoki Sugimoto, Kyoto (JP); and Kei Hirota, Okayama (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/001,672
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jul. 2, 2021, PCT No. PCT/JP2021/025152
§ 371(c)(1), (2) Date Dec. 13, 2022,
PCT Pub. No. WO2022/009799, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 2020-117401 (JP), filed on Jul. 7, 2020.
Prior Publication US 2023/0268136 A1, Aug. 24, 2023
Int. Cl. H01G 9/048 (2006.01); H01G 9/00 (2006.01); H01G 9/15 (2006.01)
CPC H01G 9/048 (2013.01) [H01G 9/0032 (2013.01); H01G 9/0036 (2013.01); H01G 9/15 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A solid electrolytic capacitor element comprising:
an anode foil that includes a porous part in a surface layer of the anode foil;
a dielectric layer that is disposed on at least a part of a surface of the anode foil; and
a cathode part that covers at least a part of the dielectric layer, wherein:
the cathode part includes a solid electrolyte layer and a cathode lead-out layer, the solid electrolyte layer covering the at least a part of the dielectric layer, the cathode lead-out layer covering at least a part of the solid electrolyte layer,
the anode foil includes a first part and a second part, the first part being a cathode forming part where the solid electrolyte layer is formed, the second part being a part where the solid electrolyte layer is not formed,
the surface layer of the anode foil includes a dense part in at least one of the first part or the second part, the dense part having a porosity smaller than a porosity of the porous part,
the second part includes at least an anode part including an end part of the anode foil opposite to the first part,
the dense part is located away from the end part and is adjacent to the porous part in a longitudinal direction of the anode foil,
the dense part includes at least a dense part of the anode part that is positioned in the anode part, and
a groove of the anode part is provided adjacent to the dense part of the anode part.