US Patent 11833443 Connection unit

A connection unit includes: a body having peripheral edges; magnets, at least one of which being disposed on each side of the peripheral edges of the body; and electrode terminals, at least three of which being disposed on the each side of the peripheral edges of the body. An outer surface of the body has a curved surface. The electrode terminals are disposed along the curved surface or the surface having the polygonal cross section of the outer surface. The electrode terminals disposed on the peripheral edges of the body have either: one positive electrode terminal and two negative electrode terminals, or one negative electrode terminal and two positive electrode terminals.