Abstract: A battery pack includes a battery core; a cover plate, the battery core connected with the cover plate; a side frame, the cover plate connected with the side frame; and a cooling plate connected with the side frame, where the battery core is disposed in an accommodating space formed among the cover plate, the cooling plate, and the side frame. A vehicle body includes a vehicle body frame having a notch, and the battery pack. The side frame of the battery pack is connected with the vehicle body frame, and the cover plate of the battery pack seals the notch as a vehicle body floor.

Abstract: A magnetic device (100) for lifting and/or holding ferromagnetic work-pieces comprises a ferromagnetic housing block (10) and a switchable magnet arrangement accommodated within a cavity of the housing block (10). The housing (10) is formed to define two longitudinal sides that are substantially decoupled magnetically from one another. The switchable magnet arrangement comprises a series of interleaved dipolar magnet units (40, 42) arranged along a longitudinal axis of the housing block (10) between the two sides. The magnet units (40, 42) comprise a series of fixed permanent magnets (40) and rotatable permanent magnets (42) that are cylindrical, or more particularly annular in shape, and traversed by an actuation shaft (24) that rotates the rotatable magnets (42) with respect to the fixed magnets (40) about the longitudinal axis of the housing block (10).