I’m working on a computer monitor’s power board (to replace a capacitor or two, which I assume is the problem), and found these:
Replacements are easy to find, so no issues there, but I’m curious why the SMD aluminum electrolytic capacitors are on little platforms (or spacers). To buffer swelling maybe?
Those capacitors are really made similarly to the cylindrical radial lead through-hole capacitors. Two connections come out through a rubber bung (in an aluminum case that is crimped at the bottom to form a seal) and those leads are bend to form SMT leads.
From this Nichicon website (a conductive polymer type is shown, and conventional electrolytics are similar):
The plastic base is just there to provide physical support for the capacitor can so it doesn't flop around too much on the leads.
The base is for support plus when soldering it is a large object which would insulate heat. Same if you ever had to solder a ball grid array chip. Also these bigger capacitor are normally connected to a power connection again soaking heat away.
