Button cell battery
Thin-profile batteries comprise batteries that have thickness dimensions which are less than a maximum linear dimension of its anode or cathode. One type of thin-profile battery is a button cell battery. Electrochemical cells of the button type are incorporated in many devices for producing electrical power. Button cell batteries are typically used in hearing aids and electronic watches, and, are thus small in size having a diameter which cam be less than half the width of a finger. Such batteries, because of their compact size, permit electronic devices to be built which themselves are very small or compact. When a higher voltage is needed in such devices, the batteries can be stacked or cascaded with one another to achieve a series electrical connection. The button cell comprises a case cup and a case cover, between which an electrically insulating plastic seal is arranged. Button cells generally have a flat-cylindrical or oval gastight case in which normally a plurality of positive and a plurality of negative electrodes with interposed separators as well as an electrolyte are arranged one above the other. The connections of the battery terminals to the electronic circuit are achieved by means of metal clamps, permanently fixed to the printed circuit or to the frame, and resiliently contacting one or other of the faces of the button cell or the edge of its case. Metal air cells are electrochemical cells where the oxygen in the air is the cathode material and a metal material is the anode material. In many instances the preferred anode material is zinc. Zinc-air cells are constructed of a zinc electrode and a catalyst or air electrode, with a separator positioned between the zinc electrode and the catalyst electrode, the cell containing electrolyte such as aqueous potassium hydroxide, which permits electrolyte ions to pass or be conducted through such separator but prevents electrode ions from migrating through such separator or membrane.
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