The “not so basics”
Internally, there’s a lot going on so we can look to further break this down;
The bottom of the cell can – Actually very little is here, just an insulation disc to isolate the cell windings from the cell can and the Negative/cathode connection from the cell winding to the can itself.
The top of the cell can – This is where the bulk of the internal components sit. Inside the top of the can from lowest to highest, you’ll find most if not all of these components – Anode tab (coming from the centre of the winding and attaching to the bottom of the CID) and mounting disc, PTC (if fitted, in the below image it’s the very thin black disc between vent disc and positive terminal), CID (the slightly curved piece in the below image), vent disc (directly below the positive top) and a gasket (the semi-clear plastic disc separating in the outer cell wall from the rest of the top cap components) separating the Negative and Positive cell connective crimp (the indentation on either side you can see when you’ve removed the outer wrap)