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We all
know lithium batteries have three ways of package: lithium cylindrical, pouch, and prismatic cells. The lithium cylindrical and prismatic cells are usually made
of steel and aluminum cases, and the lithium pouch cell of Al-plastic films.
And today we are going to talk about the differences between lithium
cylindrical and prismatic battery cells.
Energy
density refers to the capacity of a battery per unit weight. The energy density
of the mainstream 18650 lithium cylindrical cells in China reachable 215wh/kg;
and of the 50ah lithium prismatic cells reachable 205Wh/kg. But the prismatic cells
will have significant advantage in the future because of the smaller gaps between
each one when be battery pack.
Charging/discharging
rate=Charging and discharging current/nominal capacity, higher charging rate
means faster charging speed. The lithium cylindrical cell usually has the
charging rate of 1C, and the prismatic cell has a charging rate of 1.5~2C.
The best of lithium prismatic cell has a remaining capacity of more than 80% when cycles 2000times, but the cylindrical cells has only 70%.; this shows the lithium prismatic cells have a longer cycle life than cylindrical cells.