Lithium ion rechargeable batteries
have a three-layer structure consisting of an insulative porous separator
sandwiched between sheet-like cathode and anode materials, which,
in the case of a prismatic cell, are wrapped around in an elliptical
form. These materials are impregnated in an electrolyte and sealed
in a metal case. This metal case forms the anode pin (or cathode pin
in the case of an aluminum case). The top of the battery includes
the cathode pin (or anode pin in the case of an aluminum case) as
well as a safety vent to protect the battery by releasing gas externally
if the pressure inside the cell builds up to extreme levels.
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