Electrochemical cell

• US 4,507,857 A
• Filed: 06/22/1983
• Issued: 04/02/1985
• Est. Priority Date: 06/22/1983
• Status: Expired due to Term

• Current Assignee: Battery Engineering, Inc.
• Original Assignee: Battery Engineering, Inc.
• Inventors: Marincic, Nikola, Epstein, James
• Primary Examiner(s): Goldberg, Howard N.
• Assistant Examiner(s): ECHOLS, PERCY W
• Application Number:
  US06/506,786
• Time in Patent Office: 650 Days
• Field of Search: 29/623.1-623.5, 429/127, 429/162, 429/181, 228/180 R, 228/116, 228/901
• US Class Current: 29/623.2
• CPC Class Codes: H01M 50/178 for pouch or flexible bag cells
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10S 228/901 Process of bonding batteries
• CPC Class Codes: Y10T 29/49108 Electric battery cell making
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

In accordance with the invention, a novel electrochemical cell and a method for making same is provided which is particularly suitable for use in a battery of the type employing one or more cells. One feature of the cell includes a sealed non-metallic pouch of thin flexible material which forms a cell adaptable to varying battery configurations as well as cell shapes. A second feature of the cell includes a novel feedthrough arrangement wherein a pair of electrically conductive members are located on respective sides of an interjacent through-hole formed in the housing material. The pair of electrically conductive members are coupled through the through-hole to form the feedthrough. An electrode of anode material is electrically coupled to the internally located member of one feedthrough pair. An electrode of cathode material is electrically coupled to the internally located member of the other feedthrough. The cell further includes electrically insulative porous material for separating the electrodes, as well as a volume of electrolyte electrochemically coupling the electrodes.

Claims

1. A method for assemblying an electrochemical cell comprising the steps of

(a) forming a pair of through-holes in a sheet of thin resilient non-metallic material;

(b) placing each through-hole between a respective pair of overlying electrically conductive members;

(c) sealing the members of each pair of conductive members to the non-metallic material surrounding the through-hole;

(d) electrically coupling the members of each pair through the interjacent through-hole;

(e) electrically coupling an anode and a cathode respectively to the electrically conductive member of a different member pair on one side of the non-metallic sheet;

(f) forming the non-metallic material into a pouch;

(g) providing for minimal separation of the anode and cathode;

(h) adding electrolyte in electrochemical contact with the anode and cathode; and

(i) sealing the pouch.

2. The method of claim 1 including the step of sealingly compressing the interjacent non-metallic material surrounding the through-hole between the electrically conductive members;

and

bonding the electrically conductive members together through the through-hole so that the interjacent non-metallic material is held in sealing compression therebetween.

3. The method of claim 2 including the step of attaching the anode and cathode onto the interior member of a respective member pair.

4. The method of claim 3 including the step of locating the anode and cathode on opposing interior faces of the pouch.

5. The method of claim 4 including the step of modifying the shape of the pouch to permit increased pressure within the pouch during cell operation to separate the electrodes from each other.

6. The method of claim 5 including the step of biasing the electrodes for minimal separation during predetermined operating pressures.

7. The method of claim 1 wherein the non-metallic material is a thermoplastic polymer and the pouch is sealed by applying heat to the plastic to form a heat-sealed seam.