Alkaline dry cell
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Jul 23, 1998
filing date -
Jul 24, 1997
priority date (Note) -
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Abstract
An alkaline dry cell includes an anode inside a cathode. The anode includes a metal anode current collector inside an gel anode, which has zinc alloy powder as an active material. The cathode includes a cathode depolarizing mixture, which has electrolytic manganese dioxide as an active material, in a closed-end metal cathode can. Small amounts of the active materials can be used economically. A theoretical capacity ratio (N.sub.E /P.sub.E) between the anode and the cathode is in a range of 1.0 to 1.20. A contact area ratio (P.sub.A /N.sub.A) between an anode-opposed area of the cathode depolarizing mixture and a contact area of the anode current collector against the gel anode is in a range of 1.82 to 8.24. A short charge-up time makes the alkaline dry cell suitable to power the flash of a camera.
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