Connection of a first electrical line to a second electrical line by way of a connecting sleeve, - wherein the connecting sleeve consists of an electrically conducting material, - wherein the connecting sleeve has a first insertion opening, into which the first electrical line is inserted in a first insertion direction, - wherein the first electrical line is mechanically and electrically connected to an inner wall of the first insertion opening, - wherein the connecting sleeve has a second insertion opening, in which the second electrical line is inserted in a second insertion direction, - wherein the second electrical line is mechanically and electrically connected to an inner wall of the second insertion opening, - wherein the first insertion direction and the second insertion direction intersect at a point of intersection by forming an angle (α), - wherein the second electrical line is clamped by the inner wall of the second insertion opening, - wherein the angle (α) lies between 60° and 120°, characterised in that - the first electrical line has a smaller line cross-section than the second electrical line and the first insertion opening has a smaller opening cross-section than the second insertion opening, - the connecting sleeve has a tapering region either between the point of intersection and the first insertion opening, in which the connecting sleeve tapers from the opening cross-section of the second insertion opening to the opening cross-section of the first insertion opening, or between the point of intersection and the second insertion opening has an expansion area in which the connecting sleeve expands from the opening cross-section of the first insertion opening to the opening cross-section of the second insertion opening, - that outside of the first insertion opening the first electrical line is coated with an insulating lacquer and outside of the second insertion opening the second electrical line is surrounded by a wire insulation and - the first electrical line is welded to the inner wall of the first insertion opening. - wherein the connecting sleeve consists of an electrically conducting material, - wherein the connecting sleeve has a first insertion opening, into which the first electrical line is inserted in a first insertion direction, - wherein the first electrical line is mechanically and electrically connected to an inner wall of the first insertion opening, - wherein the connecting sleeve has a second insertion opening, in which the second electrical line is inserted in a second insertion direction, - wherein the second electrical line is mechanically and electrically connected to an inner wall of the second insertion opening, - wherein the first insertion direction and the second insertion direction intersect at a point of intersection by forming an angle (α), - wherein the second electrical line is clamped by the inner wall of the second insertion opening, - wherein the angle (α) lies between 60° and 120°, characterised in that - the first electrical line has a smaller line cross-section than the second electrical line and the first insertion opening has a smaller opening cross-section than the second insertion opening, - the connecting sleeve has a tapering region either between the point of intersection and the first insertion opening, in which the connecting sleeve tapers from the opening cross-section of the second insertion opening to the opening cross-section of the first insertion opening, or between the point of intersection and the second insertion opening has an expansion area in which the connecting sleeve expands from the opening cross-section of the first insertion opening to the opening cross-section of the second insertion opening, - that outside of the first insertion opening the first electrical line is coated with an insulating lacquer and outside of the second insertion opening the second electrical line is surrounded by a wire insulation and - the first electrical line is welded to the inner wall of the first insertion opening.