Low profile battery and method of making same
First Claim
1. A thin film primary battery comprising a non-conductive film substrate, thin film electrodes printed upon the substrate, aqueous electrolyte, and a sealing thin film layer sealing the battery, wherein the thin film electrodes are prepared comprising the steps of printing electrically conductive ink onto said substrate, embedding active electrode material into the wet surface of the printed conductive ink and drying the conductive ink, wherein a common cathodic electrode is employed with two or more chemically different anodic electrodes to allow for multiple voltage outputs from the same battery.
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Abstract
An ultra thin primary battery construction is disclosed along with a method for making same. The battery itself is a laminate construction consisting of a polymer film casing, printed thin film electrodes, and an aqueous electrolyte which is in intimate contact with the active surfaces of both electrodes. In this system, the electrodes themselves consist of a non-reactive conductive ink base having active electrode materials embedded into its surface. The anode to cathode electrode geometry may take one of many forms, however for ease of manufacturing, the anode and cathode electrodes face each other in an offset configuration that eliminates the need for a porous separator. The method of manufacture involves first forming the electrodes onto a polymer film followed by adding the appropriate aqueous electrolyte, and finally sealing the battery. The process for forming the electrodes themselves involves printing a polymer film with a layer of conductive ink, sprinkling an excess of active electrode material in powder form onto the wet surface of the freshly printed ink, drying or curing the ink, and finally removing any loose particles from the surface.
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Citations
19 Claims
- 1. A thin film primary battery comprising a non-conductive film substrate, thin film electrodes printed upon the substrate, aqueous electrolyte, and a sealing thin film layer sealing the battery, wherein the thin film electrodes are prepared comprising the steps of printing electrically conductive ink onto said substrate, embedding active electrode material into the wet surface of the printed conductive ink and drying the conductive ink, wherein a common cathodic electrode is employed with two or more chemically different anodic electrodes to allow for multiple voltage outputs from the same battery.
- 12. A thin film primary battery comprising a non-conductive film substrate, thin film electrodes printed upon the substrate, aqueous electrolyte, and a sealing thin film layer sealing the battery, wherein the thin film electrodes are prepared comprising the steps of printing electrically conductive ink onto said substrate, embedding active electrode material into the wet surface of the printed conductive ink and drying the conductive ink, wherein a common anodic electrode is employed with two or more chemically different cathodic electrodes to allow for multiple voltage outputs from the same battery.
- 14. A thin film battery comprising a pair of confronting non-conductive film substrates, a cathodic thin film electrode printed upon one of the substrates and an anodic thin film electrode printed on the other substrate, the orientation of the anodic and cathodic electrodes on the respective substrates being staggered so that they lie substantially in the same plane and are separated by a gap substantially filled with an aqueous electrolyte disposed between the substrates, wherein a common cathodic electrode is employed with two or more chemically different anodic electrodes to allow for multiple voltage outputs from the same battery.
- 17. A thin film battery comprising a pair of confronting non-conductive film substrates, a cathodic thin film electrode printed upon one of the substrates and an anodic thin film electrode printed on the other substrate, the orientation of the anodic and cathodic electrodes on the respective substrates being staggered so that they lie substantially in the same plane and are separated by a gap substantially filled with an aqueous electrolyte disposed between the substrates, wherein a common anodic electrode is employed with two or more chemically different cathodic electrodes to allow for multiple voltage outputs from the same battery.
Specification