Laminar electrical cells and batteries

• US 4,400,452 A
• Filed: 12/24/1981
• Issued: 08/23/1983
• Est. Priority Date: 12/24/1981
• Status: Expired due to Fees

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Bruder, Alan H.
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US06/334,375
• Time in Patent Office: 607 Days
• Field of Search: 429/152, 429/162, 429/199, 429/201, 429/206, 429/207, 429/229-231, 429/224
• US Class Current: 429/152
• CPC Class Codes: H01M 6/06 Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

Laminar electrical cells and batteries of the Leclanche type, in which the electrolyte comprises an aqueous solution containing from about 18 to about 22 percent of NH₄ Cl and from about 25 to about 40 percent of ZnCl₂ by weight, based on the weight of solution. The electrolyte may contain a gelling agent, and may initially contain a minor amount of mercuric chloride.

Claims

1. A battery of laminar series connected electrical cells, said cells each comprising a zinc anode, a manganese dioxide cathode, and an electrolyte comprising an aqueous solution of NH₄ Cl and ZnCl₂ containing from 18 to 22 percent NH₄ Cl and from 25 to 40 percent ZnCl₂ by weight based on the weight of solution.

2. The battery of claim 1, in which said electrolyte contains about 20 percent NH₄ Cl and about 30 percent ZnCl₂.

3. A laminar electrical cell especially adapted for high current drains with variable duty cycles, comprising an anodic dispersion of zinc powder containing zinc oxide and adhered to a conductive plastic substrate with a binder, a cathodic dispersion of manganese dioxide and carbon particles in an aqueous electrolyte solution, and a separator between said anodic and cathodic dispersions, in which said electrolyte consists essentially of an aqueous solution of NH₄ Cl and ZnCl₂ containing from 18 to 22 percent of NH₄ Cl and from 25 to 40 percent of ZnCl₂ based on the weight of solution.

4. The cell of claim 3, in which said solution contains about 20 percent of NH₄ Cl and about 30 percent of ZnCl₂.