After watching some tear-down videos on YouTube with various lithium battery products (portable chargers, laptop battery, power tools) they all (apart from mobile phones / tablet battery) seem to feature cylindrical battery cells.
Is there a technical reason for this, other than it's a uniform size that tiles relatively well to give manufacturers flexibility in incorporating the cells?
Best Answer
1) The cylindrical shape is very easy to manufacture - You basically fold the layers around a round object.
2) For the same reason as drinks cans - this shape is something between the Sphere (high strength and damage resistant) and Cuboid (Easy to stack and low space is wasted). It is the best trade-off between strength and volume.
3) This way You can easily stack the batteries - (Parallel and Series connections).