Hermetically sealed electrochemical storage cell

• US 4,186,246 A
• Filed: 08/11/1978
• Issued: 01/29/1980
• Est. Priority Date: 08/11/1978
• Status: Expired due to Term

• Current Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Original Assignee: General Electric Company
• Inventors: Sugalski, Raymond K.
• Primary Examiner(s): Walton, Donald L.
• Application Number:
  US05/932,922
• Time in Patent Office: 536 Days
• Field of Search: 429/57, 429/58, 429/59, 429/60, 429/94, 429/174, 429/178, 429/181, 429/185, 429/163, 429/164
• US Class Current: 429/60
• CPC Class Codes: H01M 10/34 Gastight accumulators
• CPC Class Codes: H01M 50/117 Inorganic material
• CPC Class Codes: H01M 50/179 for cells having curved cross-section, e.g. round or elliptic H01M50/176, H01M50/181 take precedence
• CPC Class Codes: H01M 50/548 on opposite sides of the cell
• CPC Class Codes: H01M 50/55 on the same side 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 50/566 by welding, soldering or brazing
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

A sealed, rechargeable electrochemical cell in which a hermetically sealed glass casing completely surrounds an electrode assembly comprised of anode and cathode electrodes containing electrochemically active material, and a porous electrolyte absorbent separator between and in contact with each of the electrodes, the electrolyte absorbed in the separator being present in an amount not exceeding the separator capacity, the seal being effected at terminal conductors extending through the casing wall from the electrodes at the interior of the cell.

Claims

1. In a sealed electrochemical storage cell, having at least one anode electrode containing electrochemically active material, at least one cathode electrode containing electrochemically active material, and a porous electrolyte absorbent separator disposed between and in contact with each of said electrodes having an electrolyte absorbed therein, the improvement comprising:

a glass enclosure surrounding said electrodes and separator and hermetically sealing the cell;

a battery terminal conductor connected to each said anode and cathode and extending through said glass casing from the interior to the exterior thereof, said terminal conductor being bonded directly to said casing in sealing relationship therewith;

the amount of said electrolyte not exceeding the capacity of said separator thereby substantially to preclude the presence of free liquid electrolyte in the cell.

2. The electrochemical cell of claim 1, wherein:

said cathode presents an electrochemically active surface area which is greater than the electrochemically active surface area of said anode.

3. The electrochemical cell of claim 1, wherein:

at least one of said anode and cathode electrodes is cylindrical in shape.

4. The electrochemical cell of claim 3, wherein:

said cylindrical electrode comprises a rigid foraminous coating carried by the terminal conductor associated therewith, said coating being impregnated with electrochemically active material.

5. The electrochemical cell of claim 4, wherein:

said separator is wrapped about said cylindrical electrode.

6. The electrochemical cell of claim 1, wherein:

said anode and cathode comprises an interleaved structure of alternating anode and cathode electrode plates each being in contact with said separator.

7. The electrochemical cell of claim 6, wherein:

the respective electrode plates of said anode and said cathode are mechanically joined to each other and to the terminal conductor at one end of said plates.

8. The electrochemical cell of claim 7, wherein:

said terminal conductors extend through opposite ends of said glass casing.

9. The electrochemical cell of claim 1, wherein:

at least one of said anode and cathode electrodes comprises a flattened portion of said terminal conductor, said flattened portion having a rigid foraminous coating impregnated with said electrochemically active material.

10. The electrochemical cell of claim 9 wherein:

the separator comprises a sleeve surrounding at least one of said electrodes.

11. In combination with the cell defined in claim 1:

a socket having positive and negative contact points; and

terminal means carried by said glass casing and adapted to be received by said socket, said terminal means being electrically connected to said terminal conductors at one end of said casing so as to provide positive and negative terminal points mating with the positive and negative contact points of the socket.

12. In combination with the cell defined in claim 1:

a conductive sheath disposed about said glass casing at one end thereof, said sheath being electrically connected to at least one of said terminal conductors and adapted to be received by socket means.

13. The electrochemical cell of claim 1, further comprising:

an electrolyte impervious wrapper disposed between the glass envelope and the exposed portions of the separator so as to preclude direct contact of the electrolyte-laden separator with the glass envelope.

14. The electrochemical cell of claim 1, further comprising:

means binding the anode, cathode and separator so as to maintain them in intimate physical contact inside the glass enclosure.

15. The electrochemical cell of claim 1, wherein:

the glass casing is cylindrical in form, said casing being sealed to said terminal conductors at at least one end of said casing.