Electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-2025069819-A1
Application number	US-202318726790-A
Country	US
Kind code	A1
Filing date	Jan 5, 2023
Priority date	Jan 19, 2022
Publication date	Feb 27, 2025
Grant date	—

Abstract

An electrolytic capacitor includes a winding portion, an anode lead member, and a cathode lead member. The winding portion includes an anode foil and a cathode foil that are wound. The anode lead member is connected to the anode foil and extends in a first direction. The cathode lead member is connected to the cathode foil and extends in the first direction. The winding portion has a shape viewed in the first direction, the shape including a first peripheral region and a second peripheral region that are opposed to each other in a second direction intersecting the first direction, and a third peripheral region and a fourth peripheral region that are opposed to each other in a third direction intersecting the first direction and the second direction. The length of the winding portion in the third direction is larger than the length of the winding portion in the second direction. The anode lead member and the cathode lead member are arranged point-symmetrically with respect to a center of the winding portion when viewed in the first direction.

First claim

1 . An electrolytic capacitor comprising:
a winding portion including an anode foil and cathode foil that are wound; an anode lead member connected to the anode foil and extending in a first direction; and a cathode lead member connected to the cathode foil and extending in the first direction, wherein: the winding portion has a shape viewed in the first direction, the shape including a first peripheral region and a second peripheral region that are opposed to each other in a second direction intersecting the first direction, and a third peripheral region and a fourth peripheral region that are opposed to each other in a third direction intersecting the first direction and the second direction, a length of the winding portion in the third direction is larger than a length of the winding portion in the second direction, and the anode lead member and the cathode lead member are arranged point-symmetrically with respect to a center of the winding portion when viewed in the first direction.

2 . The electrolytic capacitor according to claim 1 comprising:
a first anode lead member that is the anode lead member; and
a second anode lead member connected to the anode foil and extending in the first direction, wherein the second anode lead member is arranged to face the first anode lead member in the second direction.

3 . The electrolytic capacitor according to claim 1 comprising:
a first cathode lead member that is the cathode lead member; and
a second cathode lead member connected to the cathode foil and extending in the first direction, wherein the second cathode lead member is arranged to face the first cathode lead member in the second direction.

4 . An electrolytic capacitor comprising:
a winding portion including an anode foil and cathode foil that are wound; a first anode lead member and a second anode lead member that are connected to the anode foil and each extend in a first direction; and a first cathode lead member and a second cathode lead member that are connected to the cathode foil and each extend in the first direction, wherein: the winding portion has a shape viewed in the first direction, the shape including a first peripheral region and a second peripheral region that are opposed to each other in a second direction intersecting the first direction, and a third peripheral region and a fourth peripheral region that are opposed to each other in a third direction intersecting the first direction and the second direction, a length of the winding portion in the third direction is larger than a length of the winding portion in the second direction, the first peripheral region includes a first end and a second end that are opposed to each other in the third direction, the second peripheral region includes a third end and a fourth end that are opposed to each other in the third direction, the first end of the first peripheral region and the third end of the second peripheral region are opposed to each other in the second direction, the second end of the first peripheral region and the fourth end of the second peripheral region are opposed to each other in the second direction, the first anode lead member is located at the first end of the first peripheral region when viewed in the first direction, the first cathode lead member is located at the second end of the first peripheral region when viewed in the first direction, the second anode lead member is located at the third end of the second peripheral region when viewed in the first direction, and the second cathode lead member is located at the fourth end of the second peripheral region when viewed in the first direction.

5 . The electrolytic capacitor according to claim 1 further comprising:
a container that houses the winding portion; and
a heat dissipation member that dissipates heat generated inside the container, wherein:
the heat dissipation member includes a plate portion having a plate shape and a column portion extending from one surface of the plate portion,
the column portion is inserted into the winding portion, and
the plate portion is in contact with the container.

6 . The electrolytic capacitor according to claim 5 , wherein the column portion has a plate shape.

7 . The electrolytic capacitor according to claim 5 , wherein the heat dissipation member is formed of a material having a thermal conductivity of greater than or equal to 155 W/m·K.

8 . The electrolytic capacitor according to claim 5 , wherein:
the container has an opening, and the plate portion covers at least a part of the opening.

9 . The electrolytic capacitor according to claim 8 , wherein the plate portion is in contact with the container by subjecting a drawing to a part of the container.

10 . The electrolytic capacitor according to claim 8 further comprising a sealer that seals the opening, wherein:
the sealer has an exposed surface exposed from the opening, and
the heat dissipation member is disposed in contact with the exposed surface.

11 . The electrolytic capacitor according to claim 10 , wherein the heat dissipation member is formed of a material having a Young's modulus higher than a Young's modulus of the sealer.

12 . The electrolytic capacitor according to claim 11 , wherein the heat dissipation member is formed of a material having the Young's modulus of greater than or equal to 1 GPa and less than or equal to 500 GPa.

13 . The electrolytic capacitor according to claim 5 further comprising a dummy terminal fixed to a substrate mounted with the container, wherein the dummy terminal is in direct or indirect contact with at least one of the container or the heat dissipation member.

14 . The electrolytic capacitor according to claim 13 further comprising an auxiliary heat dissipation member in contact with at least one of the container or the heat dissipation member and in contact with the dummy terminal, wherein the dummy terminal is in contact with at least one of the container or the heat dissipation member via the auxiliary heat dissipation member.

15 . An electrolytic capacitor comprising:
a capacitor element including a winding portion in which an anode foil and a cathode foil are wound; a container that houses the capacitor element; and a heat dissipation member that dissipates heat generated inside the container, wherein: the heat dissipation member includes a plate portion having a plate shape and a column portion extending from one surface of the plate portion, the column portion is inserted into the winding portion, and the plate portion is in contact with the container.

16 . The electrolytic capacitor according to claim 15 , wherein the column portion has a cylindrical shape.

17 . The electrolytic capacitor according to claim 15 , wherein the heat dissipation member is formed of a material having a thermal conductivity of greater than or equal to 155 W/m·K.

18 . The electrolytic capacitor according to claim 15 , wherein:
the container includes an opening, and the plate portion covers at least a part of the opening.

19 . The electrolytic capacitor according to claim 18 , wherein the plate portion is in contact with the container by a drawing.

20 . The electrolytic capacitor according to claim 18 further comprising a sealer that seals the opening, wherein:
the sealer has an exposed surface exposed from the opening, and
the heat dissipation member is disposed in contact with the exposed surface.

21 . The electrolytic capacitor according to claim 20 , wh

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• MATSUKI Yuta
• Ashimori Youhei
• Aoyama Tatsuji
• WAKIYAMA Shintaro

Classifications

• H01G9/145

  Liquid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G9/06

  Mounting in containers · CPC title

• H01G9/151

  with wound foil electrodes · CPC title

• H01G9/0003

  Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films (H01G9/12 takes precedence) · CPC title

• H01G9/012

  specially adapted for solid capacitors · CPC title