Coupling device for coupling two or more tab electric terminals , comprising: - a pair of jaws spaced apart from each other in a first direction (X-X), each jaw having a base with two end portions, the bases of the jaws delimiting in the first direction (X-X) a seat therebetween, the seat being adapted to receive therein two or more tab electric terminals , so that respective electrical contact surfaces of the terminals face each other in a second direction (Y-Y), transverse to the first direction (X-X), - at least one clamping element configured to clamp the jaws towards each other in the first direction (X-X), - side elements spaced apart from each other in the second direction (Y-Y) to delimit the seat in the second direction (Y-Y), each side element being an arm of a respective jaw , connected to an end portion of the base of the respective jaw , or each side element being distinct from the jaws and connected at least indirectly to a respective jaw so as to translate in the first direction (X-X) together with said jaw during the clamping of the jaws , - at least one electrically conductive spacing block , arranged in the seat so as to be placed between the terminals , when they are present in the seat, the spacing block having two opposite abutment surfaces , each arranged so as to face a respective contact surface of a respective terminal , when it is present in the seat, wherein at least one of the side elements has a wedge surface , that is inclined with respect to the first and the second direction (X-X, Y-Y), characterized in that said wedge surface is arranged and inclined so as to act on at least one terminal at a face of the terminal opposite the contact surface , and to convert a pressure in the first direction (X-X), exerted by clamping the pair of jaws , into a pressure for mutual approach of the terminals in the second direction (Y-Y), when they are present in the seat, so as to press in the second direction (Y-Y) the contact surfaces of the terminals against the respective abutment surfaces of the spacing block . - a pair of jaws spaced apart from each other in a first direction (X-X), each jaw having a base with two end portions, the bases of the jaws delimiting in the first direction (X-X) a seat therebetween, the seat being adapted to receive therein two or more tab electric terminals , so that respective electrical contact surfaces of the terminals face each other in a second direction (Y-Y), transverse to the first direction (X-X), - at least one clamping element configured to clamp the jaws towards each other in the first direction (X-X), - side elements spaced apart from each other in the second direction (Y-Y) to delimit the seat in the second direction (Y-Y), each side element being an arm of a respective jaw , connected to an end portion of the base of the respective jaw , or each side element being distinct from the jaws and connected at least indirectly to a respective jaw so as to translate in the first direction (X-X) together with said jaw during the clamping of the jaws , - at least one electrically conductive spacing block , arranged in the seat so as to be placed between the terminals , when they are present in the seat, the spacing block having two opposite abutment surfaces , each arranged so as to face a respective contact surface of a respective terminal , when it is present in the seat, wherein at least one of the side elements has a wedge surface , that is inclined with respect to the first and the second direction (X-X, Y-Y), <EOS>