Secondary battery and method of manufacturing the same

• US 4,889,777 A
• Filed: 08/02/1988
• Issued: 12/26/1989
• Est. Priority Date: 08/07/1987
• Status: Expired due to Term

• Current Assignee: Nippon Telegraph and Telephone Corporation
• Original Assignee: Nippon Telegraph and Telephone Corporation
• Inventors: Akuto, Keiji
• Primary Examiner(s): Kalafut, Stephen J.
• Application Number:
  US07/227,370
• Time in Patent Office: 511 Days
• Field of Search: 429/162, 429/94, 429/209, 429/210, 29/623.4
• US Class Current: 429/162
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/126 Small-sized flat cells or batteries for portable equipment H01M10/123 and H01M10/125 take precedence
• 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
• CPC Class Codes: Y10T 29/49114 including adhesively bonding

Abstract

A secondary battery has positive and negative electrode members juxtaposed on a substantially identical plane. End faces of the positive and negative electrode members oppose each other at a distance. A substrate fixes and supports the positive and negative electrode members. A cover member defines, with the substrate, a sealed chamber includng the positive and negative electrode members. An electrolyte is sealed in the sealed chamber. The battery can be manufactured a through deposition of electrode materials.

Claims

1. A secondary battery comprising:

positive and negative electrode members arranged on a substantially identical plane, the positive and negative electrode members each having main surfaces and end faces, end faces of the positive and negative electrode members being spaced apart and opposing each other at distance;

a substrate fixedly contacting a main surface of the positive and negative electrode members and fixedly supporting the positive and negative electrode members;

a cover member defining, with the substrate, a sealed chamber enclosing and covering the positive and negative electrode members; and

an electrolyte sealed in the sealed chamber, and the cover member being arranged relative to the electrode members such that the electrolyte is substantially present between the opposite end faces of the positive and negative electrode members, the electrolyte being associated with a battery reaction with the positive and negative electrode members, and wherein the electrolyte is present between the end faces of the positive and negative electrode members in an amount sufficient that the battery reaction substantially takes place at battery reaction sites defined between the opposite end faces of the positive and negative electrode members, said battery reaction sites extending substantially perpendicular to the direction of thickness of the positive and negative electrode members.

2. A battery according to claim 1, wherein each of the positive and negative electrode members has a comb-like shape having a plurality of teeth.

4. A battery according to claim 1, wherein each of the positive and negative electrode members has a wave-like shape.

5. A battery according to claim 1, wherein each of the positive and negative electrode members has a helical shape.

6. A battery according to claim 1, wherein the positive electrode member comprises lead dioxide, the negative electrode member comprises lead, and the electrolyte comprises diluted sulfuric acid.

7. A battery according to claim 1, wherein each of the positive and negative electrode members has a thickness of not more than 1 mm.

8. A battery according to claim 1, wherein substantially all of said electrolyte is present between the opposite end faces of the positive and negative electrode members.

9. A battery according to claim 1, wherein said cover member contacts main surfaces of said positive and negative electrode members which are opposite to those main surfaces which contact said substrate, whereby all of the electrolyte is between the opposite end faces of the electrode members, the electrolyte not contacting main surfaces of the positive and negative electrode members.

3. A battery according to claim 3, wherein the tooth has a rectangular shape.

10. A method of manufacturing a secondary battery which is adapted to be repeatedly subjected to cycles of charging and discharging, comprising the steps of:

applying a positive electrode material containing positive electrode active material and a negative electrode material containing a negative electrode active material to a substrate to form positive and negative electrode members having end faces which oppose each other at a distance, said positive and negative electrode members having main surfaces which are fixed on and juxtaposed on the substrate so as to be supported by the substrate;

bonding a cover member to the substrate such that the cover member defines, with the substrate, a sealed chamber enclosing and covering the positive and negative electrode members; and

filling an electrolyte associated with a battery reaction with the positive and negative electrode members into said sealed chamber and the cover member being arranged relative to the electrode member such that the electrolyte is substantially present between the opposite end faces of the positive and negative electrode members, the electrolyte being present between the end faces of the positive and negative electrode members in an amount sufficient to produce with the electrode members a battery reaction which substantially takes place at battery reaction sites defined between the opposite end faces of the positive and negative electrode members and said battery reaction sites extending substantially perpendicular to the direction of thickness of the positive and negative electrode members.

11. A method according to claim 10, wherein the positive and negative electrode members are formed on the substrate by screen printing flame spraying, plating, deposition, sputtering, ion plating, or plasma chemical vapor deposition.

12. A method according to claim 10, wherein each of the positive and negative electrode members has a thickness of not more than 1 mm.

13. A method according to claim 10, further comprising subjecting said positive and negative electrode material applied to said substrate to a formation treatment.

14. A method according to claim 10, wherein said step of filling said electrolyte comprises filling substantially all of said electrolyte in spaces between the opposite end faces of the positive and negative electrode members.

15. A method according to claim 10, wherein the step of bonding the cover member to the substrate comprises contacting the cover member with main surfaces of the positive and negative electrode members are opposite from those main surfaces contacting the substrate, such that the electrolyte is filled in said chamber, all of the electrolyte is present in the spaces between end faces of the positive and negative electrode members, and no electrolyte contacts the main surfaces which are contacted by the cover member.

16. A secondary device, comprising:

a plurality of unit cells juxtaposed adjacent each other on an identical plane, each unit cell comprising pair of positive and negative electrode members arranged on said plane, said positive and negative electrode members each having end faces opposing each other at a distance, the positive electrode member of one unit cell and the negative electrode member of another unit cell in each adjacent two unit cells contacting with each other at respective faces;

a substrate fixedly contacting a main surface of said positive and negative electrode members and fixedly supporting said electrode members o said plurality of unit cells;

a cover member defining, with said substrate, a sealed chamber enclosing and covering said plurality of unit cells; and

an electrolyte sealed in said sealed chamber, and the cover member being arranged relative to the electrode members such that the electrolyte is substantially present between the opposite end faces of the positive and negative electrode members of each unit cell, the electrolyte being present between the end faces of the positive and negative electrode members in an amount sufficient to produce a battery reaction with the positive and negative electrode members of each unit cell, which battery reaction substantially takes place at battery reaction sites defined between opposite end faces of the positive and negative electrode members and said battery reaction sites extending substantially perpendicular to the direction of thickness of the positive and negative electrode members.

17. A device according to claim 16, wherein each of the positive and negative electrode members has a comb-like shape having a plurality of teeth.

18. A device according to claim 17, wherein said teeth of said comb-like shaped electrode members has a substantially rectangular shape.

19. A device according to claim 16, wherein each of the positive and negative electrode members has a wave-like shape.

20. A device according to claim 16, wherein each of the positive and negative electrode members has a helical shape.

21. A device according to claim 16, wherein the positive electrode member comprises lead dioxide, the negative electrode member comprises lead, and the electrolyte comprises diluted sulfuric acid.

22. A device according to claim 16, wherein each of the positive and negative electrode members has a thickness of not more than 1 mm.

23. A device according to claim 16, wherein substantially all of said electrolyte is present between the opposite end faces of the positive and negative electrode members.

24. A device according to claim 16, wherein said cover member contacts main surfaces of said positive and negative electrode members which are opposite to those main surfaces which contact said substrate, whereby all of the electrolyte is between the opposite end faces of the electrode members, the electrolyte not contacting main surfaces of the positive and negative electrode members.