Electrolytic capacitor
An electrolytic capacitor includes a capacitor element, a lead member electrically connected to the capacitor element, an outer packaging member in which the capacitor element and a part of the lead member are sealed, and a heat barrier layer that covers at least a part of the outer packaging member. The heat barrier layer has an electrical insulation property, and contains at least one of metallic oxide and metal hydroxide.
1. An electrolytic capacitor comprising:
a capacitor element;
a lead member electrically connected to the capacitor element;
an outer packaging member in which the capacitor element and a part of the lead member are sealed; and
a heat barrier layer that covers at least a part of a surface of the outer packaging member, the heat barrier layer having an electrical insulation property, wherein:
the heat barrier layer contains at least one of metallic oxide or metal hydroxide,
the metallic oxide is at least one selected from a group consisting of aluminum oxide, magnesium oxide, titanium oxide, and zirconium oxide,
the metallic oxide does not include a hydrate of metallic oxide, and
the at least one of metallic oxide or metal hydroxide is in a form of porous particle.
2. The electrolytic capacitor according to claim 1 , wherein:
the heat barrier layer contains the metal hydroxide, and
the metal hydroxide is at least one of magnesium hydroxide and aluminum hydroxide.
3. The electrolytic capacitor according to claim 1 , wherein the heat barrier layer further contains resin.
4. The electrolytic capacitor according to claim 1 , wherein:
the outer packaging member is an outer packaging resin layer that covers the capacitor element and the part of the lead member,
the outer packaging resin layer includes a filler, and
the porous particle of the at least one of metallic oxide and metal hydroxide is more porous than the filler.
5. The electrolytic capacitor according to claim 1 , wherein a thickness of the heat barrier layer ranges from 1 μm to 100 μm, inclusive.
6. The electrolytic capacitor according to claim 1 , wherein:
the capacitor element includes a solid electrolyte, and
the solid electrolyte includes a conductive polymer.
7. An electrolytic capacitor comprising:
a capacitor element;
a lead member electrically connected to the capacitor element; and
an outer packaging resin layer that covers the capacitor element and a part of the lead member, wherein:
the outer packaging resin layer includes a porous particle having an electrical insulation property,
the porous particle includes at least one of metallic oxide or metal hydroxide,
the metallic oxide is at least one selected from a group consisting of aluminum oxide, magnesium oxide, titanium oxide, and zirconium oxide, and
the metallic oxide does not include a hydrate of metallic oxide.
8. The electrolytic capacitor according to claim 7 , wherein:
the outer packaging resin layer includes filler, and
the porous particle is more porous than the filler.
9. The electrolytic capacitor according to claim 8 , wherein a content ratio of the porous particle in the outer packaging resin layer ranges from 20 parts by mass to 80 parts by mass, inclusive, with respect to a total of 100 parts by mass of the porous particle and the filler.
10. The electrolytic capacitor according to claim 7 , wherein the porous particle includes metallic oxide.
11. The electrolytic capacitor according to claim 7 , wherein:
the capacitor element includes a solid electrolyte, and
the solid electrolyte includes a conductive polymer.