Sensing assembly and manufacturing method of battery cell stack

A sensing assembly comprising:

• a plurality of busbars;
• and a plurality of sensing frames arranged along a first direction and configured to support the plurality of busbars,
• wherein the sensing frames include a middle sensing frame and an outer sensing frame disposed on a first side of the middle sensing frame along the first direction, and wherein the middle sensing frame includes:
• a first peripheral surface configured to face toward one side in the first direction;
• a second peripheral surface disposed on an opposite side to the first peripheral surface and configured to face toward an opposite side in the first direction;
• a support surface connected with the second peripheral surface and configured to face toward one side in a second direction crossing the first direction;
• a guide protrusion configured to protrude from the first peripheral surface toward the one side in the first direction;
• and
• a guide groove disposed on an area where the support surface and the second peripheral surface are connected, the guide groove being open toward the opposite side in the first direction and the one side in the second direction.