Patent attributes
A safety switch device connects a heating unit for at least one battery cell of a high-voltage battery of a motor vehicle to a power supply connection that provides a heating current for the heating unit. The device includes: a first controllable switching element arranged in a heating current transmission path, which is designed to receive a control signal supplied by a unit external to the high-voltage battery via a signal transmission path of the safety switch device and to generate heating current transmission between the heating unit and the power supply connection according to the received control signal; a separating unit arranged in the heating current transmission path, for interrupting the heating current transmission in the event of failure of the first switching element; and a transmission unit arranged in the signal transmission path, which is designed to transmit the control signal potential-free to the first switching element, for the galvanic separation of the high-voltage battery and the unit.