Bushing which forms a terminal for a metal/ion electrochemical accumulator, formed through a hole which opens at one side and the other of a wall of the casing of the accumulator, comprising: - an electrically conductive male component, comprising at the inner side a passage which is intended to circulate a cooling fluid which has circulated along the longitudinal axis of the accumulator, the passage opening towards the outer side of the accumulator; - an electrically conductive female component adjusted so as to be tightened around a portion of the male component, at the outer side of the accumulator; - two electrically insulating washers (48, 49) which each comprise an abutment portion which is in surface abutment with pressure at the same time against one of the faces of the wall and a guiding portion which protrudes relative to the abutment portion and which is in contact with the edge of the hole; the abutment portion of a washer being in abutment with pressure against the female component; the abutment portion of the other washer being in abutment with pressure against a portion of the male component, the male component comprising: - a thread which is intended to cooperate by means of screwing with another thread for the fixing and the electrical output of the accumulator; - a first diameter enlargement which is located below the thread and which acts as a diameter for crimping to the female component, and - a second diameter enlargement in continuation of the first which acts as a surface both for abutment with the electrical insulation washer and a surface for connection to a current collector which is intended to make the electrical connection with the electrochemical cell of the accumulator. - an electrically conductive male component, comprising at the inner side a passage which is intended to circulate a cooling fluid which has circulated along the longitudinal axis of the accumulator, the passage opening towards the outer side of the accumulator; - an electrically conductive female component adjusted so as to be tightened around a portion of the male component, at the outer side of the accumulator; - two electrically insulating washers (48, 49) which each comprise an abutment portion which is in surface abutment with pressure at the same time against one of the faces of the wall and a guiding portion which protrudes relative to the abutment portion and which is in contact with the edge of the hole; the abutment portion of a washer being in abutment with pressure against the female component; the abutment portion of the other washer being in abutment with pressure against a portion of the male component, the male component comprising: - a thread which is intended to cooperate by means of screwing with another thread for the fixing and the electrical output of the accumulator; - a first diameter enlargement which is located below the thread and which acts as a diameter for crimping to the female component, and - a second diameter enlargement in continuation of the first which acts as a surface both for abutment with the electrical insulation washer and a surface for connection to a current collector which is intended to make the electrical connection with the electrochemical cell of the accumulator.