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The differences between lithium cylindrical and prismatic cells

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.

prismatic cellscylindrical cells


Energy density


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/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.


Cycle life


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.

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