Method of manufacturing solid electrolytic capacitor including exterior body that covers capacitor element
View Patent ↗A capacitor element that has an anode body, a dielectric oxide film layer covering the anode body, and a cathode body formed on the dielectric oxide film layer; an exterior body that covers the capacitor element; a contact layer that is on an anode terminal, which is an end portion of the anode body, and has a surface with a predetermined surface roughness; and an anode-side electrode layer that covers the surface are provided.
1 . A method of manufacturing a solid electrolytic capacitor, the method comprising:
a step of forming a capacitor element having an anode body;
a step of covering the capacitor element with an exterior body;
a step of exposing an anode terminal portion from the exterior body, the anode terminal portion being an end portion of the anode body;
a step of forming a contact layer on the anode terminal portion;
a step of forming a predetermined roughness on a surface of the contact layer; and
a step of coating the surface of the contact layer with an anode-side electrode layer, wherein:
the step of forming the contact layer includes a step of accumulating metal particles on the anode terminal portion to form a metal film on the anode terminal portion, and
each of the metal particles has a spherical shape or a substantially spherical shape.
2 . The method according to claim 1 , wherein
the step of forming the contact layer and the step of forming the predetermined roughness on the surface of the contact layer are performed at the same time.
3 . The method according to claim 2 , wherein
the surface of the contact layer has a surface roughness.
4 . The method according to claim 1 , wherein
the surface of the contact layer has a surface roughness.
5 . The method according to claim 1 , wherein
the surface of the contact layer in a cross-section in a thickness direction of the anode body has a projection shape projecting at a central portion or a substantially linear shape.
6 . The method according to claim 1 , wherein
the contact layer and the anode terminal portion are metal-bonded to each other.
7 . The method according to claim 1 , wherein
the contact layer includes a metal having an ionization tendency lower than an ionization tendency of the anode body.
8 . A method of manufacturing a solid electrolytic capacitor, the method comprising:
a step of forming a capacitor element having an anode body;
a step of covering the capacitor element with an exterior body;
a step of exposing an anode terminal portion from the exterior body, the anode terminal portion being an end portion of the anode body;
a step of forming a contact layer on the anode terminal portion;
a step of forming a predetermined roughness on a surface of the contact layer; and
a step of coating the surface of the contact layer with an anode-side electrode layer, wherein:
the step of forming the contact layer includes a step of accumulating metal particles on the anode terminal portion to form a metal film on the anode terminal portion, and
the contact layer and the anode terminal portion are metal-bonded to each other.
9 . The method according to claim 8 , wherein
the step of forming the contact layer and the step of forming the predetermined roughness on the surface of the contact layer are performed at the same time.
10 . The method according to claim 9 , wherein
the surface of the contact layer has a surface roughness.
11 . The method according to claim 8 , wherein
the surface of the contact layer has a surface roughness.
12 . The method according to claim 8 , wherein
the surface of the contact layer in a cross-section in a thickness direction of the anode body has a projection shape projecting at a central portion or a substantially linear shape.
13 . The method according to claim 8 , wherein
the contact layer includes a metal having an ionization tendency lower than an ionization tendency of the anode body.