Battery management unit with a PCB integrated fluxgate current sensor

A battery management unit for a battery system with a conductor or a busbar, the battery management unit comprising:

• a printed circuit board;
• and
• a fluxgate current sensor comprising:
• a magnetic core having a through-hole;
• at least one excitation winding wound around the magnetic core;
• at least one compensation winding wound around the magnetic core;
• and
• a sensor circuit configured to measure a magnetization of the at least one excitation winding, to generate a driving signal for driving the at least one compensation winding such that a magnetic flux in the magnetic core is cancelled out by a current in the at least one compensation winding, to generate a current flowing through the at least one compensation winding according to the driving signal, and to generate an output signal corresponding to a magnitude of an electric current flowing through the through-hole of the magnetic core;
• wherein the magnetic core, the at least one excitation winding, the at least one compensation winding, and the sensor circuit are each integrated into the printed circuit board, turns of the at least one excitation winding and the at least one compensation winding being entirely parallel to the printed circuit board, and
• wherein the magnetic core is arranged on the printed circuit board such that the battery management unit is mountable into the battery system and such that the conductor or the busbar of the battery system passes through the through-hole of the magnetic core.