Electrical contact for battery package or similar device

• US 5,197,889 A
• Filed: 02/03/1992
• Issued: 03/30/1993
• Est. Priority Date: 02/03/1992
• Status: Expired due to Term

• Current Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Rizzo, Matthew, Bresin, Mark S.
• Primary Examiner(s): Abrams, Neil
• Application Number:
  US07/829,642
• Time in Patent Office: 421 Days
• Field of Search: 439/67, 439/76, 439/77, 439/500, 361/398, 429/99, 429/100, 429/178, 429/179
• US Class Current: 439/76.1
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/528 Fixed electrical connections, i.e. not intended for disconnection
• CPC Class Codes: H01R 13/2414 conductive elastomers
• CPC Class Codes: H01R 13/2428 using meander springs
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/056 Folded around rigid support or component
• CPC Class Codes: H05K 2201/0999 Circuit printed on or in housing, e.g. housing as PCB; Circuit printed on the case of a component; PCB affixed to housing
• CPC Class Codes: H05K 2201/1034 Edge terminals, i.e. separate pieces of metal attached to the edge of the PCB tab H05K2201/0397
• CPC Class Codes: H05K 2203/1311 Foil encapsulation, e.g. of mounted components
• CPC Class Codes: H05K 2203/1461 Applying or finishing the circuit pattern after another process, e.g. after filling of vias with conductive paste, after making printed resistors
• CPC Class Codes: H05K 3/32 electrically connecting electric components or wires to printed circuits
• CPC Class Codes: H05K 3/321 by conductive adhesives
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electrical contact (150) in a housing (110) is created by forming an opening (112) in a wall of the housing. A circuit assembly (130) situated inside the housing (110) has a conductive member (140) that is formed to be of substantially the same shape as the opening (112) in the housing. A portion (150) of the conductive member (140) fits into the opening (112) and a second portion is adhesive bonded to the circuit assembly (130). The electrical interconnection (145) between the conductive member (140) and a copper circuit pattern (134) on the circuit assembly (130) is made by creating a hole or via (145) through the conductive member down to the copper circuit pattern and plating copper (147) into the hole or filling the hole with conductive polymers. A battery package (100) is made by adding additional electrical components to the circuit assembly (130) and connecting a plurality of cells (120) to the circuit assembly.

Claims

1. An assembly including an electrical contact, comprising:

a housing having multiple walls and having at least one opening in at least one of said walls; and

a circuit assembly situated within said housing, the circuit assembly comprising;

a substrate material having two major opposed faces;

a conductive circuit pattern on at least one face of said substrate material; and

a conductive member having first and second portions, said first portion bonded to said substrate with a polymeric, non-conductive adhesive and electrically connected to said conductive circuit pattern by means of a plated through hole, said second portion having a shape substantially the same as said housing opening and situated within said opening to form an electrical contact in said housing wall.

2. A housing including an electrical contact, comprising:

a housing having multiple walls and having at least one opening in at least one of said walls; and

a flexible circuit situated within said housing, the flexible circuit comprising;

a flexible film material having two opposed faces;

a conductive circuit pattern on at least one face of said flexible film material;

a polymer adhesive material bonded to at least a portion of said flexible circuit;

an integral conductive member having first and second portions, said first portion bonded to said polymer adhesive material and electrically connected to said conductive circuit pattern, said second portion having a shape substantially the same as said housing opening and situated within said opening to form an electrical contact in said housing wall; and

said conductive member formed during the fabrication of the flexible circuit.

3. The electrical contact as described in claim 2, wherein said flexible film material is selected from the group consisting of polyimides, polyamides, polyamide-imides, polyetherimides, polyesters, polyvinyl chlorides, polyparabanic acids, fluoroploymers, aramids, nylons, epoxies, and combinations thereof.

4. The electrical contact as described in claim 2, wherein said first conductive circuit pattern is copper, silver filled ink, nickel, aluminum, or a conductive polymer.

5. The electrical contact as described in claim 2, wherein said housing is a battery package housing.

6. The electrical contact as described in claim 5, further comprising a plurality of battery cells electrically connected to said flexible circuit and situated within said housing.

7. The electrical contact as described in claim 2, wherein said flexible circuit further comprises at least one covercoat.

8. The electrical contact as described in claim 7, wherein said adhesive material covers at least a portion of said covercoat and is bonded to said at least a portion of said covercoat.

9. The electrical contact as described in claim 2, wherein said flexible circuit further comprises one or more electrical components selected from the group consisting of resistors, diodes, transistors, capacitors, switches, and thermistors.

10. The electrical contact as described in claim 2, wherein said second portion of said conductive member is formed into a three dimensional shape.

11. The electrical contact as described in claim 10, wherein said second portion of said conductive member is formed so as to extend beyond said housing wall when situated within said opening.

12. The electrical contact as described in claim 10, wherein said second portion of said conductive member is formed so as to be coplanar with said housing wall when situated within said opening.

13. The electrical contact as described in claim 2, wherein said second portion of said conductive member is formed so as to provide an interference fit in said opening.

14. The electrical contact as described in claim 2, wherein said first portion of said conductive member is electrically connected to said conductive circuit pattern by means of at least one plated through hole.

15. The electrical contact as described in claim 2, wherein said adhesive material is bonded to a second face of said flexible film material, and said conductive member is bonded to said adhesive material so as to be on a side of said flexible film material opposite to said conductive circuit pattern.

16. A battery package, comprising:

a housing having multiple walls and having at least one opening in at least one of said walls;

a plurality of cells situated within said housing; and

a flexible circuit electrically connected to said plurality of cells and situated within said housing, the flexible circuit comprising;

an insulating flexible film having two opposed faces;

a copper circuit pattern on at least one face of said flexible film;

a polymer adhesive material bonded to at least a portion of said copper circuit pattern or said flexible film;

a conductive member having first and second portions, said first portion bonded to said adhesive material and electrically connected to said copper circuit pattern by means of at least one plated through hole, said second portion having a shape substantially the same as said housing opening and formed so as to substantially fit within said opening to form an electrical contact in said battery housing wall;

said conductive member being an integral part of the flexible circuit and formed during fabrication of the flexible circuit; and

one or more electrical components selected from the group consisting of resistors, diodes, transistors, capacitors, switches, and thermistors, said components soldered to said copper circuit pattern.

17. The battery package as described in claim 16, wherein said flexible film base material is selected from the group consisting of polyimides, polyamides, polyamide-imides, polyetherimides, polyesters, polyvinyl chlorides, fluoropolymers, aramids, nylons, epoxies, and combinations thereof.

18. The battery package as described in claim 16, wherein said circuit assembly further comprises at least one covercoat.

19. The battery package as described in claim 18, wherein said adhesive material covers at least a portion of said covercoat and is bonded to said at least a portion of said covercoat.