Abstract: A current sensor including a measurement circuit and an electrical conductor having at least one first measurement path defined by a first pickup contact and a second pick-up contact at which a first voltage can be detected across the first measurement path, a first connection contact for electrically contacting a connection element, a second connection contact for electrically contacting a battery pole terminal, and a current feed contact for electrically contacting a device for providing a calibration current. The first measurement path is in series between the first connection contact and the second connection contact. A calibration current supplied at the current feed contact induces a current density distribution in the first measurement path, which converges with a current density distribution in the first measurement path, induced by a load current of equal current intensity supplied at the first connection contact.

Abstract: A current sensor for detecting a current from or into a vehicle battery, comprising: * a measurement circuit; and * an electric conductor, having:—at least one first measurement path, defined by a first potential pick-up contacting means (1) and a second potential pick-up contacting means (2), at which a first voltage (U1) over the first measurement path can be detected;—a first connection contact (21) for electrically contacting a connection element;—a second connection contact (22) for electrically contacting a battery pole terminal; and—a current feed contacting means (5) for electrically contacting a device for providing a calibration current; wherein the first measurement path is formed in series between the first connection contact (21) and the second connection contact (22), wherein the electrical conductor, on account of its geometrical parameters (11,12,13,14,15) and contacting means (1,2,3,4,5,6,21,22), is formed in such a way that a calibration current (Iref) that can be fed at the current feed con