wiki says VéloSoleX is a moped, or motorised bicycle, which was originally produced by the French manufacturer Solex, based in Paris, France. From memory it is a bicycle with a small engine mounted above the front wheel. The company name is solex. I only knew petrol ones, many years ago. I would guess from your questions that there are now electric/battery velosolexes. Wiki says the electric one is called Solexity or e-solex. "Nominal voltage" you need more context. Usually it will mean the rated voltage, but this term can be used differently. For example "nominal" can mean the normal operating value. This can be quite different from "rated" which can sometimes mean the normal maximum voltage. A kick stand is symmetrical, usually lifting the bicycle wheel off the ground by swinging down lower than the wheel when you kick/move/push it down. It is spring-loaded to stay up or down. A side stand usually means a strut, a support on one side only, so you put it down & lean the bicycle over until it rests at an angle on the side stand & both wheels. That is three points are on the ground. The side stand is easier but less stable, usually.

KICK STAND A short metal bar attached to and pivoting on the bottom of the frame of a motorcycle or bicycle, which when kicked into a vertical position holds the stationary vehicle upright. SIDE STAND A short metal bar attached to a cycle at the left side of back wheel