Flexible thin film cell including packaging material

• US 5,217,828 A
• Filed: 02/13/1991
• Issued: 06/08/1993
• Est. Priority Date: 05/01/1989
• Status: Expired due to Term

• Current Assignee: Brother Kogyo Kabushiki Kaisha
• Original Assignee: Brother Kogyo Kabushiki Kaisha
• Inventors: Miyabayashi, Takeshi, Mano, Morimasa, Sangyoji, Kazuo
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): CLARK, SHEILA V
• Application Number:
  US07/654,548
• Time in Patent Office: 846 Days
• Field of Search: 429/192, 429/213, 429/185, 429/162, 429/178, 429/127, 439/192, 439/213, 439/185, 439/162, 439/178, 439/127
• US Class Current: 429/127
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 50/209 adapted for prismatic or rectangular cells H01M50/216 takes precedence
• CPC Class Codes: H01M 6/188 Processes of manufacture
• CPC Class Codes: H01M 6/40 Printed batteries , e.g. thin film batteries
• CPC Class Codes: H05K 1/16 incorporating printed electric components, e.g. printed resistor, capacitor, inductor
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Disclosed herein is a thin film cell in which a cell unit is sealed by a polyimide film. Such a cell unit can be obtained by forming an ion-conductive polymer electrolytic layer formed by mixing polyethylene oxide derivatives with lithium salt on a negative-polarity material composed of lithium or a lithium-aluminum metal foil and then forming a layer of a positive-polarity material from composite materials formed by mixing Vanadium oxide and polyethylene oxide derivatives together, on the electrolytic layer, by using a screen printing process. Also disclosed is a printed circuit board with a thin film cell incorporated therein, in which said cell unit is to be mounted on a flexible film substrate, by using a screen printing process. By this invention, the thin film cell and the printed circuit board can be fabricated in a continuous manner by making use of a screen printing process.

Claims

1. A thin film cell comprising:

at least one cell unit which includes;

a flexible electrically-conductive negative-polarity material layer;

a flexible electrically-conductive positive-polarity material layer;

an electrolyte material layer tightly packed between said negative-polarity material layer and said positive-polarity material layer; and

an electrically-conductive collector formed on said positive-polarity material layer; and

packaging means for sealingly enclosing said at least one cell unit, said packaging means including two films, each of said two films having an electrically conductive lead connected to the respective film along an entire surface of said conductive lead, the conductive lead of a first one of said two films being connected to the negative-polarity material layer of said at least one cell unit, and the conductive lead of a second one of said two films being connected to said collector, each of said films being bonded to each other around peripheral edges of said at least one cell unit so as to sealingly enclose said at least one cell unit.

2. The thin film cell according to claim 1, wherein at least one of said negative-polarity material layer, said positive-polarity material layer and said electrolyte material layer are formed by a screen printing process.