APPARATUS AND METHOD FOR CHECKING FOR MIS-ASSEMBLY OF BATTERY CELL ACTIVATION TRAY OR TWISTING THEREOF DURING OPERATION

A check device and method for checking for misalignment or twisting during operation of a battery cell activation tray is provided where the cell activation tray includes an external tray having a fence and an inner tray for accommodating a battery cell fixed at a predetermined distance from the fence on a bottom of the external tray. The check device includes an upper pillar portion and a lower pillar portion extending from the upper pillar portion. The upper pillar portion has a thickness greater than a predetermined separation distance and the lower pillar portion has a thickness smaller than the predetermined separation distance. A first surface of the check device is planar and a second surface of the check device opposite the first surface has a step portion corresponding to a thickness difference between the thickness of the upper pillar portion and the thickness of the lower pillar portion.