Battery system with a battery, which is designed to supply a high-voltage network with electric energy, and a measuring device for measuring at least one insulation resistance of the battery

Abstract

The invention relates to a battery system () with a battery (), which is designed to supply a high voltage network () with electric energy, and a measuring device () for measuring at least one insulation resistance provided between the battery () and a housing of the battery (). The measuring device () is equipped with two measuring paths (), each of which is paired with one of two high-voltage connections () of the battery (), each of which comprises a series circuit that comprises a first resistor () and a relay (), and each of which is connected between the paired high-voltage connection () and a point () that has a housing potential. Furthermore, each series circuit has a semiconductor switch (). The measuring device () also has two functional modes in which the relays () of the measuring paths () are closed. When switched to a passive functional mode of the two functional modes, the measuring device () is designed to open each semiconductor switch () or to keep the semiconductor switch in an open state. When switched to an active functional mode of the two functional modes, the measuring device () is additionally designed to alternately open and close the semiconductor switches (), to measure a first voltage which drops over the first resistor () of each measuring path () when the semiconductor switch () of the corresponding measuring path () is closed, and to determine a corresponding insulation resistance of the battery () using each measured first voltage.