Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Plural cells
Patent
1995-04-20
1996-03-12
Skapars, Anthony
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Plural cells
429192, H01M 618
Patent
active
054984904
ABSTRACT:
Charge rates of individual battery cells are equalized and battery safety increased by limiting the amount of current that will flow through the battery in the event of a short circuit either external to or internal to the battery. A solid-polymer battery having a cathodic layer, an anodic layer, an ionically conductive polymeric electrolyte situated intermediate the cathodic layer and the anodic layer, a first electrode electrically connected to the cathodic layer, and a second electrode electrically connected to the anodic layer, has additionally an electronically conductive polymeric layer situated intermediate the first and second electrodes and having a resistivity within a range so as to limit current flow through the battery in case of the occurrence of a short circuit between the cathodic layer and the anodic layer, and to reduce a terminal voltage of the battery no more than few percent as compared to what the terminal voltage of the battery would be without the electronically conductive polymeric layer. The electronically conductive polymeric layer limits the amount of current that will flow through the battery in the event of a short circuit either external to or internal to the battery. Alternatively, a battery is made up of a plurality of electrochemical hi-fold cells each having a relatively thin layer of anode material and a relatively thin strip of cathode material separated from said anode layer by an interposing solid electrolyte layer, thereby forming a cell laminate with the electrolyte layer and the anode layer, the cell laminate being folded at a fold so as to form a bi-fold cell; a cathode current collector strip; and a resistive adhesive polymer applied to a contact area of the cathode current collector strip so as to attach the cathode current collector strip to each of the bi-fold cells at the fold, the adhesive having a resistivity within a range so as to limit current flow through the battery but reducing a terminal voltage of the battery no more than few percent as compared to what the terminal voltage of the battery would be without the resistive adhesive. The resistive adhesive polymer equalizes charge rates of individual battery cells.
REFERENCES:
patent: 4518665 (1985-05-01), Fujita et al.
patent: 4621035 (1986-11-01), Bruder
patent: 4997732 (1991-03-01), Austin et al.
patent: 5227264 (1993-07-01), Duval et al.
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