Method of making a flat battery

• US 4,152,825 A
• Filed: 06/10/1974
• Issued: 05/08/1979
• Est. Priority Date: 06/10/1974
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Bruneau, Louis O.
• Primary Examiner(s): LeFevour, Charles F.
• Application Number:
  US05/478,106
• Time in Patent Office: 1,793 Days
• Field of Search: 136/175, 136/176, 136/111, 29/623.1-623.5, 429/152-162
• US Class Current: 29/623.2
• CPC Class Codes: H01M 6/48 with bipolar electrodes
• CPC Class Codes: Y10T 29/4911 including sealing

Abstract

A flat battery structure and method of fabricating it which is characterized in the utilization of an electrically insulative carrier web base in combination with discretely positioned electrically conductive components of the battery pile structure. Through the select dimensioning of the discrete components of the battery, in conjunction with the utilization of insulative web carriers, improved reliability of battery operation is realized.

Claims

1. A method for constructing flat battery units comprising the steps of:

providing first current collectors, each having a lengthwise and widthwise dimension;

providing a continuous carrier sheet of electrically insulative material having a widthwise dimension at least as great as the widthwise dimension of said first current collectors;

intermittently depositing in predetermined spaced sequential alignment upon one side of said continuous carrier sheet said first current collectors;

thereon depositing in a predetermined sequence superposed on each first current collector electrolyte, anode materials, cathode materials, separators and intercell connectors; and

thereon depositing a second current collector to form discrete electrically coupled flat cell assemblies; and

cutting said continuous carrier sheet between said discrete cell assemblies to provide discrete battery units comprising a sheet of electrically insulative material at least coextensive in size with a first current collector.

2. The method for constructing flat battery units of claim 1 in which said continuous carrier sheet is provided having a widthwise dimension substantially corresponding with the width of an ultimate flat battery unit.

3. The method for constructing flat battery units of claim 1 including the step of providing access openings within said continuous carrier sheet to expose the surface of each said first current collector thereby defining a first terminal surface for each said constructed discrete flat battery units.

4. The method for constructing flat battery units of claim 3 wherein said access openings are provided at a predetermined repetitive spacing along said carrier sheet.

5. The method for constructing flat battery units of claim 4 wherein the second current collector has a widthwise dimension greater than the width of said carrier sheet and extending beyond a width defining edge thereof.

6. The method for constructing flat battery units of claim 5 which includes the step of folding the portion of said second current collector extending beyond said carrier sheet over and in juxtaposition against said carrier sheet to define a second terminal surface of said flat battery unit on the same side of said battery as said first terminal.

7. The method for constructing flat battery units of claim 6 including the step of packaging said battery units in a manner exposing portions of said first and second terminals.

8. A method for constructing flat multicell batteries comprising the steps of:

providing a continuous carrier sheet of electrically insulative material having intermittently spaced access openings;

intermittently fixedly positioning discrete first current collectors in predetermined spaced sequential relationship directly upon one side of said continuous carrier sheet, each of said first current collectors being spaced coincidentally with one of said intermittent access openings in said insulative carrier sheet thereby forming a first battery terminal;

forming a predetermined number of cells upon each said collector, said cells including intercell connectors, and cathode and anode electrodes between which is disposed electrolyte and separator means;

positioning discrete second collector assemblies over and in electrochemical association with the uppermost of said cells to form a multicell unit, said second collector assemblies having a width selectively extending beyond the edge of said continuous carrier sheet;

folding said width of said second collector assembly extending beyond said carrier sheet about the edge thereof to a position juxtaposed against a surface thereof, thereby forming a second battery terminal on the same side of said battery as said first terminal; and

sealing the periphery of each said multicell unit.

9. The method for constructing flat multicell batteries of claim 8 in which said continuous carrier sheet is provided having a widthwise dimension substantially corresponding with the width of a said flat battery unit.

10. The method of constructing flat multicell batteries of claim 8 including the step of:

cutting said continuous carrier sheet between said multicell units.

11. The method for constructing flat multicell batteries of claim 10 including the step of:

packaging said multicell units in a manner exposing selectively spaced and dimensioned portions of said current collector.

12. The method for constructing flat multicell batteries of claim 8 wherein said continuous carrier sheet is provided having a widthwise dimension corresponding with the width of one said battery.

13. A method for making flat multicell primary batteries comprising the steps of:

providing a discrete laminar first current collector assembly having a lengthwise and widthwise dimension;

providing a continuous carrier sheet of electrically insulative material having a widthwise dimension at least as great as the widthwise dimension of said discrete laminar first current collector;

intermittently positioning a discrete laminar first current collector assembly upon said carrier sheet, said assembly having a metallic surface positional against said carrier sheet and an oppositely disposed electrically conductive material supporting a first electrode;

positioning electrolyte, discrete separator and discrete intercell connectors carrying complementing electrode materials over said first current collector assembly to provide a multicell subassembly;

selectively intersealing said carrier sheet, said first current collector assembly, said discrete separator and said intercell connector;

positioning a discrete laminar second current assembly upon each said multicell subassembly, said second collector assembly having an electrode supporting electrically conducting material positioned in operative relationship with said multicell assembly and an outwardly facing metallic surface; and

sealing the periphery of said multicell subassembly and said second collector assembly.

14. The method for making flat multicell primary batteries of claim 13 wherein said multicell subassemblies are built up upon said continuous carrier sheet in predetermined spaced relationship and,

including the step of cutting said continuous carrier sheet between said discrete multicell subassemblies following the said sealing of the periphery of said multicell subassembly and said second collector assembly.

15. The method for making flat multicell primary batteries of claim 14 including the step of providing access openings within said continuous carrier sheet to expose said metallic surface of said discrete laminar first current collector assembly thereby defining a terminal surface.

16. The method for making flat multicell primary batteries of claim 13 in which said second current collector assembly is provided having a width extending beyond an edge of said carrier sheet and including the step of folding the portion of said second current collector extending beyond said carrier sheet over and in juxtaposition against said carrier sheet to define a terminal surface of said batteries.

17. The method for making flat multicell primary batteries of claim 16 including the step of packaging each said assembled primary battery in a manner exposing selectively spaced and dimensioned metallic surface portions of said first and second current collector assemblies.