Current collector sheet and electrochemical device

• US 7,858,231 B2
• Filed: 06/27/2005
• Issued: 12/28/2010
• Est. Priority Date: 12/27/2002
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nishimura, Ken, Oshima, Toru, Ikoma, Munehisa, Daio, Fumio, Arai, Naoto, Kaiya, Hideo
• Primary Examiner(s): Yuan; Dah-Wei D
• Assistant Examiner(s): Enin-Okut; Edu E
• Application Number:
  US11/166,414
• Publication Number:
  US 20050284750A1
• Time in Patent Office: 2,010 Days
• Field of Search: None
• US Class Current: 429/210
• CPC Class Codes: H01M 10/044 with bipolar electrodes
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 2200/103 Fuse
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 4/668 Composites of electroconductive material and synthetic resins
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 50/586 inside the batteries, e.g. incorrect connections of electrodes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A current collector sheet for an electrode of an electrochemical device has a conductive area and an insulating area on the surface thereof. Examples of the current collector sheet includes: a current collector sheet including an insulating sheet, wherein the conductive area has a conductive layer formed on the surface of the insulating sheet, and the insulating area has an exposed portion of the insulating sheet; a current collector sheet including a conductive sheet, wherein the insulating area has an insulating layer formed on the surface of the conductive sheet, and the conductive area has an exposed portion of the conductive sheet; and a current collector sheet including a conductive sheet portion and an insulating sheet portion positioned flush with each other, wherein the conductive area has a surface of the conductive sheet portion, and the insulating area has a surface of the insulating sheet portion.

Claims

1. An electrochemical device having an electrode assembly comprising:

a first electrode;

a second electrode; and

a separator interposed between said first electrode and said second electrode, said first electrode, said second electrode and said separator being stacked on one another, wherein;

said first electrode comprises a first insulating sheet, a first conductive layer formed on a surface of said first insulating sheet, and a first electrode material mixture layer formed on a surface of said first conductive layer, said first insulating sheet having a peripheral area which includes outer edges of the first insulating sheet and extends from the outer edges toward a center of the first insulating sheet,

said first conductive layer is formed so that said first insulating sheet is exposed only at a first portion of the peripheral area of said first insulating sheet, and a second portion of the peripheral area of said insulating sheet which is a remaining portion other than the first portion of the peripheral area of said first insulating sheet and a center area of said first insulating sheet which is a portion other than the peripheral area of the first insulating sheet are covered,

said first conductive layer comprises a first electrode material mixture layer carrying portion carrying said first electrode material mixture layer, and a first terminal connecting portion not carrying said first electrode material mixture layer,

and

said first terminal connecting portion is arranged on the second portion of the peripheral area of said first insulating sheet, wherein;

said second electrode comprises a second insulating sheet, a second conductive layer formed on a surface of said second insulating sheet, and a second electrode material mixture layer formed on a surface of said second conductive layer, said second insulating sheet having a peripheral area which includes outer edges of the second insulating sheet and extends from the outer edged toward a center of the second insulating sheet,

said second conductive layer is formed so that said second insulating sheet is exposed only at a first portion of the peripheral area of said second insulating sheet, and a second portion of the peripheral area of the second insulating sheet which is a remaining portion other than the first portion of the peripheral area of said second insulating sheet and a center area of said second insulating sheet which is a portion other than the peripheral area of the second insulating sheet are covered,

said second conductive layer comprises a second electrode material mixture layer carrying portion carrying said second electrode material mixture layer, and a second terminal connecting portion not carrying said second electrode material mixture layer,

said second terminal connecting portion is arranged on the second portion of the peripheral area of said second insulating sheet, and wherein

said first terminal connecting portion and said second terminal connecting portion are arranged so as not to face each other.

2. The electrochemical device in accordance with claim 1, wherein a contour of said first electrode and a contour of said second electrode overlap each other in the stacking direction.