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1. A module unit, comprising:
a main body attached to a plurality of battery cells having a first side facing the plurality of battery cells and second side opposite from first side; a bus bar provided on the main body to electrically connect the battery cells; and a temperature sensor engaged with the main body to measure a temperature of at least one of the battery cells, wherein the main body has a removed cut-out portion forming a through hole from the first side of the main body to the second side of the main body; wherein the temperature sensor includes:
a retaining portion diagonally extending away from the temperature sensor and which is retained to an edge part of the first side of the main body at the through hole after the retaining portion passes through the through hole from the second side of the main body; andan attaching portion which has an operation part at an end part thereof and is formed so as not to pass through the through hole and to be retained on the second side of the main body; wherein when the operation part is pushed downward, the retaining portion is elastically deformed due to a sliding contact with the edge part of the first side of the main body so that the temperature sensor passes through the through hole; and wherein when the main body is attached to the battery cells, the temperature sensor comes into contact with the at least one battery cell, wherein the retaining portion is inside the main body.
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