Battery assembly

• US 5,008,161 A
• Filed: 02/01/1989
• Issued: 04/16/1991
• Est. Priority Date: 02/01/1989
• Status: Expired due to Fees

• Current Assignee: Lowell E. Johnston
• Original Assignee: Lowell E. Johnston
• Inventors: Johnston, Lowell E.
• Primary Examiner(s): HEARN, BRIAN E
• Application Number:
  US07/304,953
• Time in Patent Office: 804 Days
• Field of Search: 429/7, 429/61, 429/62, 429/94, 429/185, 429/271
• US Class Current: 429/7
• CPC Class Codes: H01M 50/154 Lid or cover comprising an axial bore for receiving a central current collector
• CPC Class Codes: H01M 50/548 on opposite sides of the cell
• CPC Class Codes: H01M 50/559 Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells H01M50/553 takes precedence
• CPC Class Codes: H01M 50/581 in response to temperature
• CPC Class Codes: H01M 6/10 with wound or folded electrodes

Abstract

A battery cell including a cylindrical container having a cap assembly positioned in the open end thereof. The cap assembly includes a terminal extending into the container, a rigid plate, a thermal disconnect assembly and a contact cap. A seal fits about the cap assembly to electrically isolate the cap from the container and provide a sealing function and vent for the battery. A sleeve is associated with the seal to tightly seal the terminal. The terminal is associated with a spiral wrapped cell by means of a tab welded thereto. The cell is assembled in a flat layered arrangement and then wrapped about the terminal prior to placement in the container.

Claims

1. A battery comprising

a container having an opening therein;

a plate positioned in said opening;

a terminal attached to said plate and extending into said container;

a sleeve concentrically positioned about said terminal;

a nonconductive seal positioned about said terminal against said plate and between said sleeve and said terminal and extending in substantially juxtaposition with said plate to about the periphery of said plate between said plate and said container in said opening, said sleeve being compressed about said terminal to seal said container at said terminal.

2. The battery of claim 1 wherein said sleeve is magnetically swaged about said terminal and is insulated from the interior of said container.

3. The battery of claim 1 wherein said seal extends from inwardly of said sleeve to around said sleeve and then outwardly to the periphery of said plate.

4. The battery of claim 1 wherein said container is cylindrical, said terminal is concentrically positioned in said container and said plate is a circular disc.

5. The battery of claim 1 wherein said seal is constructed to include a central cylindrical portion, a radially extending portion and a peripheral cylindrical portion, said central cylindrical portion including a concentric cylindrical cavity closed at a first end most distant to said plate and open at a second end most proximate to said plate, said sleeve being in said cavity.

6. The battery of claim 1 wherein said container is compressed about the periphery of said plate with said seal therebetween.

7. A battery comprising

a container having an opening therein;

a plate positioned in said opening;

a terminal attached to said plate and extending into said container;

a sleeve concentrically positioned about said terminal;

a nonconductive seal positioned about said terminal between said sleeve and said terminal and extending outwardly to about the periphery of said plate between said plate and said container in said opening, said sleeve being compressed about said terminal and being insulated from the interior of said container;

a contact cap positioned on said plate outwardly of said container and an annular compression ring about said plate and extending to interlock with said cap on one side of said plate and with said plate on the other side thereof, said ring being inwardly of said container and said seal at said opening.

8. The battery of claim 7 further comprising a thermal disconnect assembly between said cap and said plate, said cap and said plate being electrically coupled only through said thermal disconnect assembly.

9. The battery of claim 7 wherein the outside dimensions of said ring are less than the corresponding inside dimensions of said container at said opening, said nonconductive seal being in interlocking engagement with both said ring and said container at said opening.

10. A battery comprising

a container having an opening therein;

a plate positioned in said opening;

a terminal attached to said plate and extending into said container;

a nonconductive seal positioned about said terminal and extending radially coextensive with said plate to about the periphery of said plate between said plate and said container in said opening;

a tab attached to said terminal;

an anode sheet attached to said tab;

first and second separator sheets, each said sheet being on one side of said anode sheet;

a cathode sheet on a first side of said anode sheet with a said separator sheet therebetween, said anode sheet, said cathode sheet and said separator sheets being spiral wrapped about said terminal.

11. The battery of claim 10 wherein said tab is welded to said terminal.

12. The battery of claim 10 wherein said anode sheet has two parallel side edges, a first end to which said tab is affixed and a second end, said separator sheets extending beyond said anode sheet on said two side edges and said second end.

13. The battery of claim 12 wherein said cathode sheet includes a substrate screen and cathode material adhered to said substrate screen, said screen extending beyond said cathode material and said separator sheets to an interference engagement with said container.

14. A battery comprising

a container having an opening therein;

a plate positioned in said opening;

a terminal attached to said plate and extending into said container;

a sleeve concentrically positioned about said terminal at said plate;

a nonconductive seal constructed to include a central cylindrical portion positioned about said terminal, a radially extending portion coextensive and in substantial juxtaposition with said plate and a peripheral cylindrical portion extending about the periphery of said plate between said plate and said container in said opening, said sleeve being compressed about said terminal to seal said container at said terminal with a portion of said seal between said sleeve and said terminal;

a tab attached to said terminal;

an anode sheet attached to said tab;

first and second separator sheets on opposite sides of said anode sheet;

a cathode sheet on a first side of said anode sheet with a said separator sheet therebetween, said anode sheet, said cathode sheet and said separator sheets being spiral wrapped about said terminal.

15. The battery of claim 14 wherein said cathode sheet includes a substrate screen and cathode material positioned on said screen, said screen extending beyond said cathode material and beyond said separator sheets on a first side to an interference engagement with said container.

16. A battery comprising

a container having an opening therein;

a plate positioned in said opening;

a terminal attached to said plate and extending into said container;

a sleeve concentrically positioned about said terminal;

a nonconductive seal positioned about said terminal between said sleeve and said terminal and extending to about the periphery of said plate between said plate and said container in said opening, said sleeve being compressed about said terminal and said plate being noninterlocking with said container in said opening, said nonconductive seal mounting said plate in said opening of said container with said nonconductive seal being in interlocking engagement with said opening in said container.

17. A battery comprising

a container having an opening therein;

a cap assembly positioned in said opening;

a terminal attached to said cap assembly and extending into said container;

a sleeve concentrically positioned about said terminal;

a nonconductive seal positioned about said terminal extending to between said sleeve and said terminal and extending to about the periphery of said cap assembly between said cap assembly and said container in said opening, the outside dimensions of said cap assembly being less than the corresponding inside dimensions of said container at said opening, said nonconductive seal being in interlocking engagement with both said cap assembly and said container at said opening.