Alkaline cell with improved separator
First Claim
1. In an alkaline electrochemical cell, said cell having an open ended cylindrical casing, said cell having a positive and a negative terminal, an anode comprising zinc and a cathode comprising manganese dioxide, said cathode having an outside surface contacting said casing and an inside surface of said cathode facing said anode, a separator contacting said inside surface of the cathode, an electrically insulating sealing disk having a rupturable membrane therein, said insulating sealing disk having an electrically conductive current collector passing therethrough, said insulating sealing disk sealing the open end of said casing and providing electrical insulation between said current collector and said casing, the improvement comprising:
- the separator adhering to the inside surface of the cathode;
an electrically insulating protector disk in contact with a surface of said cathode, said protector disk being located between the said cathode and said insulating sealing disk.
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Accused Products
Abstract
An electrochemical separator is formed insitu on an electrode surface within an electrochemical cell, preferably an alkaline cell cathode surface. The alkaline cell comprises a zinc anode, a and potassium hydroxide electrolyte. The cathode may comprise a cathode comprising manganese dioxide. The separator may be formed by coating an electrode surface preferably with a low molecular weight copolymer of polyvinyalcohol and polyvinylacetate. The film can be coagulated to form a permeable separator uniformly conforming to and covering the electrode surface irrespective of the shape and contour of the electrode. A separate protector disk can be inserted onto the top surface of the cathode to protect the cathode from shorting in the event that imperfections in the separator surface develop. The protector disk can have a protruding lip which surrounds and protects the inside corner edge of the cathode.
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Citations
26 Claims
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1. In an alkaline electrochemical cell, said cell having an open ended cylindrical casing, said cell having a positive and a negative terminal, an anode comprising zinc and a cathode comprising manganese dioxide, said cathode having an outside surface contacting said casing and an inside surface of said cathode facing said anode, a separator contacting said inside surface of the cathode, an electrically insulating sealing disk having a rupturable membrane therein, said insulating sealing disk having an electrically conductive current collector passing therethrough, said insulating sealing disk sealing the open end of said casing and providing electrical insulation between said current collector and said casing, the improvement comprising:
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the separator adhering to the inside surface of the cathode;
an electrically insulating protector disk in contact with a surface of said cathode, said protector disk being located between the said cathode and said insulating sealing disk. - View Dependent Claims (2, 3, 4)
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5. In an alkaline electrochemical cell, said cell having an open ended cylindrical cell casing and an end cap assembly inserted therein closing said casing, said cell having a positive and a negative terminal, an anode comprising zinc, and a cathode comprising manganese dioxide, said cathode having an outside surface contacting said casing and an inside surface of said cathode facing said anode, a separator contacting said inside surface of the cathode, said end cap assembly comprising an end cap and an electrically insulating sealing disk having a rupturable membrane therein, said insulating sealing disk having an elongated electrically conductive current collector passing therethrough, the current collector being in electrical contact with the end cap, said insulating sealing disk sealing the open end of said casing and providing electrical insulation between said current collector and said casing, the improvement comprising:
an electrically insulating protector member in contact with a surface of said cathode, said protector member being located between said cathode and said insulating sealing disk. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. In an alkaline electrochemical cell, said cell having an open ended cylindrical casing, said cell having a positive and a negative terminal, an anode comprising zinc anode material and a cathode comprisng manganese dioxide, said cathode having an outside surface contacting said casing and an inside surface of said cathode facing said anode, a separator contacting said inside surface of the cathode, an electrically insulating sealing disk having a rupturable membrane therein, said insulating sealing disk having an electrically conductive current collector passing therethrough, said insulating sealing disk sealing the open end of said casing and providing electrical insulation between said current collector and said casing, the improvement comprising:
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the separator adhering to the inside surface of the cathode;
said insulating sealing disk has a circuferential skirt protruding into the cell interior, wherein a portion of said skirt extends over and contacts a portion of the cathode inside surface thereby providing an impenetrable barrier between said anode material and said casing. - View Dependent Claims (26)
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Specification