DEVICE FOR MEASURING ELECTRODE POTENTIAL

A device for measuring electrode potential includes a body having an insertion portion to receive a cylindrical secondary battery with a separated beaded part formed on one surface thereof, a cover covering the one surface of the body, a working electrode terminal fixed to the body; and a counter electrode terminal fixed to the body. The insertion part includes a first insertion portion, into which a cap assembly of the cylindrical secondary battery is insertable, a second insertion portion, into which a case of the cylindrical secondary battery is insertable, and a third insertion portion, into which a first electrode tab of the cylindrical secondary battery is insertable. The second insertion part includes a case insertion portion, into which the case of the cylindrical secondary battery is insertable, and an injection portion, into which an electrolyte is injectable. A reference electrode terminal is connected to the injection portion.