Electric double layer capacitor

• US 7,719,821 B2
• Filed: 02/28/2007
• Issued: 05/18/2010
• Est. Priority Date: 03/31/2006
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Kato, Kikuko, Niki, Sachi, Nonoue, Hiroshi
• Primary Examiner(s): Ha; Nguyen T
• Application Number:
  US11/712,297
• Publication Number:
  US 20070253141A1
• Time in Patent Office: 1,175 Days
• Field of Search: 361/502, 361503-504, 361508-512, 361516-519, 361/523, 361/525, 361528-541, 29/250.1, 29/250.3
• US Class Current: 361/502
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01G 11/80 Gaskets; Sealings
• CPC Class Codes: H01G 11/82 Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
• CPC Class Codes: H01G 9/06 Mounting in containers
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

The present invention provides an electric double layer capacitor. An electric double layer capacitor element sandwiches a separator between a cathode and an anode, arranged inside a container comprising a concave shaped containing portion and lid. A first conductive layer on the inner bottom face of a containing portion is covered by an insulating layer, and opening portions formed on the insulating layer penetrate to the first conductive layer. A second conductive layer is formed on the insulating layer and inside the opening portions, and is connected to a cathode through a conductive adhesive. The first conductive layer penetrates through the side wall of the containing portion, and is connected to a connecting terminal. An anode is connected to a third conductive layer through a conductive adhesive, and a collector is connected to a connecting terminal by extending between the containing portion and the lid.

Claims

1. An electric double layer capacitor comprising;

a container having a lid and a containing portion comprised of an insulating material,

an electric double layer capacitor element having a first electrode and a second electrode arranged to face each other inside of said container through a separator; and

an electrolytic solution located in said containing portion;

wherein said containing portion comprises;

a first conductive layer formed on an inner face of said containing portion;

an insulating layer formed to cover said first conductive layer;

a first opening portion and a second opening portion that reach from a surface of said insulating layer to said first conductive layer; and

a second conductive layer formed on said first conductive layer within said first opening portion and the second opening portion;

wherein said first electrode and said second conductive layer are electrically connected.

2. The electric double layer capacitor according claim 1, wherein a minimum value of opening widths for said first opening portion and said second opening portion is larger than 50 μ

m.

3. The electric double layer capacitor according claim 1 or 2, wherein (Δ

β

×

L2), a product of a difference of each linear coefficient of expansion for said first conducive layer and said second conductive layer, Δ

β

, and a maximum value of opening widths for said first opening portion and said second opening portion, L2, is 0.0039 μ

m/°

C. or below.

4. An electric double layer capacitor comprising;

a container having a lid and a containing portion comprised of an insulating material,

an electric double layer capacitor element having a first electrode and a second electrode arranged to face each other inside of said container through a separator;

an electrolytic solution located in said containing portion;

a first conductive layer formed on an inner face of said containing portion;

an insulating layer formed to cover said first conductive layer;

a plurality of opening portions that reach from a surface of said insulating layer to said first conductive layer; and

a second conductive layer formed on said first conductive layer within said plurality of opening portions;

wherein said first electrode and said second conductive layer are electrically connected.

5. The electric double layer capacitor according claim 4, wherein a minimum value of opening widths for said plurality of opening portions is larger than 50 μ

m.

6. The electric double layer capacitor according claim 4 or 5, wherein (Δ

β

×

L2), a product of a difference of each linear coefficient of expansion for said first conducive layer and said second conductive layer, Δ

β

, and a maximum value of opening widths for said plurality of opening portions, L2, is 0.0039 μ

m/°

C. or below.

7. An electric double layer capacitor comprising;

a container having a lid and a containing portion comprised of an insulating material,

an electric double layer capacitor element having a first electrode and a second electrode arranged to face each other inside of said container through a separator;

an electrolytic solution located in said containing portion;

a first conductive layer formed on an inner face of said containing portion;

an insulating layer formed to cover said first conductive layer;

a group comprising four opening portions that each reach from a surface of said insulating layer to said first conductive layer; and

second conductive layers formed on said first conductive layer within said group of four opening portions;

wherein said first electrode and said second conductive layer are electrically connected.

8. The electric double layer capacitor according claim 7, wherein a minimum value of opening widths for each of said group of four opening portions is larger than 50 μ

m.

9. The electric double layer capacitor according claim 7 or 8, wherein (Δ

β

×

L2), a product of a difference of each linear coefficient of expansion for said first conducive layer and said second conductive layer, Δ

β

, and a maximum value of opening widths for each of said group of four opening portions, L2, is 0.0039 μ

m/°

C. or below.