Abstract: A battery cell includes an electrode assembly and a housing accommodating the electrode assembly. The electrode assembly includes a first electrode plate and a second electrode plate. The first electrode plate includes a current collector, a connecting piece, and a tab. The current collector includes a plurality of stacked flat portions. A fixed end of the connecting piece is connected to one of the flat portions. A free end of the connecting piece is disposed toward the flat portion. The free end is flexibly bendable against the current collector. A first end of the tab is fixed to the connecting piece, and a second end of the tab is disposed beyond the flat portion.

Abstract: A method for generating a road map for vehicle navigation comprises: receiving an original road map having a crossroad junction, an inward lane entering the crossroad junction, and an outward lane leaving the crossroad junction; generating a reference path capable of guiding a vehicle driving from the inward lane to the outward lane through the crossroad junction; generating a polygonal hub that encompasses the crossroad junction, wherein the reference path enters and leaves the hub by crossing a first binder and a second binder, respectively; and generating automatically a type of the reference path based on the geometrical relationship between the first binder and the second binder.