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"Coin cell" batteries are available in a variety of technologies - NiCd, NiMH, Li-Ion, Ag-ClMg, etc. But they are mostly small, slippery, and difficult to handle.
I propose that such cells be made with two new features: magnetic contacts, and toroidal geometry.
The magnetic contacts would allow
effortless stacking and simple terminal connections. In addition, cell polarity could be matched to magnetic polarity to prevent reverse-polarity insertion.
The second feature, toroidal (doughnut, washer, or lifesaver shaped) geometry, would allow alternate-polarity stacking on an insulating rod for storage, to prevent discharge, and would be an asset for miniature products requiring fluid or airflow along the axis (hearing aids, fans, powered drinking straws, smoke-ring blowers...)
Care would have to be taken to prevent unintentional magnetization of credit cards, etc in close proximity.
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||Care would also have to be taken not to damage the magnets. When a magnet breaks, one piece reverses polarity. If that's the big piece...
||Battery operated smoke-ring blowers. I can't imagine a future without them.
||Its a neat idea but making disposable
batteries heavier and more expensive
hardly seems to be a winner. These
batteries are competing for smallest
and most energy dense specifications
and any feature that detracts from
those specs is going to require a killer
app. to gain popularity. You can already
stack flat batteries however you like
without danger of discharge as long as
you prevent the two ends of the stack
from forming a circuit and a doughnut
shape would add nothing to the feature
of magnetic fields preventing reverse
polarity stacking. It would improve the
quality of the contact between the cells
but for very small low amperage cells
this isn't really an issue. Not sure what
the two ideas have to do with one
||//stack flat batteries however you like ... prevent the two ends of the stack from forming a circuit //
||Sounds mutually exclusive.
||//a doughnut shape would add nothing to the feature of magnetic fields preventing reverse polarity stacking.//
||The doughnut shape _allows_ reverse polarity stacking by enabling the use of an insulating shaft on which to stack the NS SN NS SN repelling cells. Also would make them shock-absorbent for shipping.
||Perhaps these would be made using a rechargeable technology, in order to improve the cost/value ratio.
||But, c'mon, this is the HB! If I thought $$ could be made on this, I wouldn't have posted...
||//killer app. to gain popularity.//
Several examples are given: (hearing aids, fans, powered drinking straws, smoke-ring blowers...) ;)