Connection device for the electrical connection of a flat electrical module, which is used to generate electricity and which preferably comprises a carrier film with a photovoltaic layer, to a connection cable, - with a first half-shell with a first holding part and at least one first locking element, - with a second half-shell with a second holding part and at least one second locking element which can be coupled to the at least one first locking element in order to close the first and second half-shells (11; 12) together connect, and - with at least one sealing device by means of which the connection point between the mutually facing holding parts (115, 125) can be tightly sealed, characterized in that, that the sealing device comprises a first seal, which rests on the first holding part, and a second seal, which rests on the second holding part, that the first half-shell and the second half-shell can be connected to one another by means of the first and second locking elements (111, 121) in such a way that a part of the carrier film held therebetween lies against the first seal with one side and against the second seal with the other side. can be tightly enclosed and that within the space delimited by the two interconnected half-shells (11, 12) a conductor connection unit is held, which is connected on the one hand to the connection cable and on the other hand to a connection line of the electrical module is connected or connectable. - with a first half-shell with a first holding part and at least one first locking element, - with a second half-shell with a second holding part and at least one second locking element which can be coupled to the at least one first locking element in order to close the first and second half-shells (11; 12) together connect, and - with at least one sealing device by means of which the connection point between the mutually facing holding parts (115, 125) can be tightly sealed, characterized in that, that the sealing device comprises a first seal, which rests on the first holding part, and a second seal, which rests on the second holding part, that the first half-shell and the second half-shell can be connected to one another by means of the first and second locking elements (111, 121) in such a way that a part of the carrier film held therebetween lies against the first seal with one side and against the second seal with the other side. can be tightly enclosed and that within the space delimited by the two interconnected half-shells (11, 12) a conductor connection unit is held, which is connected on the one hand to the connection cable and on the other hand to a connection line of the electrical module is connected or connectable. that the sealing device comprises a first seal, which rests on the first holding part, and a second seal, which rests on the second holding part, that the first half-shell and the second half-shell can be connected to one another by means of the first and second locking elements (111, 121) in such a way that a part of the carrier film held therebetween lies against the first seal with one side and against the second seal with the other side. can be tightly enclosed and that within the space delimited by the two interconnected half-shells (11, 12) a conductor connection unit is held, which is connected on the one hand to the connection cable and on the other hand to a connection line of the electrical module is connected or connectable.