The terminal connection portion 322 of the connection terminal 320 may have a rectangular parallelepiped shape including an opening in the front side thereof, but the embodiment is not limited thereto.

In addition, the connection terminal 320 may further include a first locking protrusion 326. The first locking protrusion 326 may be disposed on the bottom surface of the terminal connection portion 322 so as to be oriented toward the wire-holding portion 324. The first locking protrusion 326 may have a shape that is bent and extends downwards from the bottom surface of the terminal connection portion 322.

In addition, the connection terminal 320 may further include a connection guide portion 328. The connection guide portion 328 may prevent the connection terminal 320, connected to the separator 600 through the housing 310, from being separated from the separator 600.

The terminal position assurance (TPA) 330 may be detachably fitted into a TPA terminal insertion hole formed in the front surface of the housing 310, and may press-fit the connection terminal 320 into the housing 310. That is, the TPA 330 may increase the insertion force of the connection terminal 320, may prevent erroneous assembly by correctly positioning the connection terminal 320, and may make it possible to continuously sense the voltage value with high electrical reliability in spite of the small pitches between the separators 600. To this end, the housing 310 may include a TPA terminal insertion hole formed in a portion thereof above the connection terminal insertion hole.