Apparatus and method for checking for mis-assembly of battery cell activation tray or twisting thereof during operation

A check device for checking for misalignment or twisting during operation of a battery cell activation tray, the cell activation tray including an external tray having a fence on an outer periphery of the external tray;

• and an inner tray for accommodating a battery cell fixed at a predetermined distance from the fence on a bottom of the external tray, in which a separation distance exists between the fence and a vertical sidewall of the inner tray facing the fence to define a separation space, the check device comprising:
• an upper pillar portion;
• and
• a lower pillar portion extending from the upper pillar portion,
• wherein the upper pillar portion has a thickness greater than a predetermined separation distance between the vertical sidewall of the inner tray and the fence of the external tray,
• wherein the lower pillar portion has a thickness smaller than the predetermined separation distance,
• wherein 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, and
• wherein, when the check device is inserted into the separation space between the fence and the vertical sidewall from the lower pillar portion in a top-down direction, in a state where the first surface is placed in contact with one side in the longitudinal direction of the inner tray, if the lower pillar portion is inserted in the separation space and the upper pillar portion is caught on the fence, the check device provides a criterion for discrimination as normal, and if the lower pillar portion is caught on the fence or the upper pillar portion is inserted into the separation space, the check device provides a criterion for discrimination as abnormal, or
• wherein, when the check device is inserted from the lower pillar portion into the separation space between the fence and the vertical sidewall from a distal edge of the inner tray to a center in the vertical wall of the inner tray, in a state where the first surface is placed in contact with the fence adjacent to the distal edge of the inner tray, if the lower pillar portion is inserted into the separation space and the upper pillar portion is caught on the vertical sidewall of the inner tray, the check device provides a criterion for discrimination as normal, and if the lower pillar portion is caught on the vertical sidewall of the inner tray or the upper pillar portion is inserted into the separation space, the check device provides a criterion for discrimination as abnormal.