Disconnection device for a high-voltage electrical system of a motor vehicle, high-voltage electrical system, and motor vehicle

A disconnection device for a high-voltage on-board power system of a motor vehicle for disconnecting a high-voltage line of the high-voltage on-board power system, comprising:

• an overcurrent protection apparatus for interrupting an overcurrent flowing through the high-voltage line;
• a first disconnection unit formed by a first actuatable switch-off unit, wherein the first switch-off unit is designed to interrupt a flow of current through the first disconnection unit in the activated state,
• a second disconnection unit formed by a second actuatable switch-off unit and the overcurrent protection apparatus, wherein the second switch-off unit is designed to channel the overcurrent to the overcurrent protection apparatus interrupting the flow of current through the second disconnection unit in the activated state;
• and
• a control unit that, in order to disconnect the high-voltage line, is designed to activate at least the second switch-off unit in the case of an overcurrent flowing through the high-voltage line and to activate at least the first switch-off unit in the case of an event independent of an overcurrent, wherein
• the first switch-off unit is designed as a pyrotechnic switch-off unit that channels a flow of current through the first disconnection unit in the deactivated state and interrupts a flow of current through the first disconnection unit in an activated state and that is able to be ignited by the control unit in order to be activated.

A disconnection device for a high-voltage on-board power system of a motor vehicle for disconnecting a high-voltage line of the high-voltage on-board power system, comprising:

• an overcurrent protection apparatus for interrupting an overcurrent flowing through the high-voltage line;
• a first disconnection unit formed by a first actuatable switch-off unit, wherein the first switch-off unit is designed to interrupt a flow of current through the first disconnection unit in the activated state,
• a second disconnection unit formed by a second actuatable switch-off unit and the overcurrent protection apparatus, wherein the second switch-off unit is designed to channel the overcurrent to the overcurrent protection apparatus interrupting the flow of current through the second disconnection unit in the activated state;
• and
• a control unit that, in order to disconnect the high-voltage line, is designed to activate at least the second switch-off unit in the case of an overcurrent flowing through the high-voltage line and to activate at least the first switch-off unit in the case of an event independent of an overcurrent, wherein
• the second switch-off unit is designed as a pyrotechnic switch-off unit that channels a flow of current through the second disconnection unit in the deactivated state and channels a flow of current to the overcurrent protection apparatus in an activated state.

A disconnection device for a high-voltage on-board power system of a motor vehicle for disconnecting a high-voltage line of the high-voltage on-board power system, comprising:

• an overcurrent protection apparatus for interrupting an overcurrent flowing through the high-voltage line;
• a first disconnection unit formed by a first actuatable switch-off unit, wherein the first switch-off unit is designed to interrupt a flow of current through the first disconnection unit in the activated state,
• a second disconnection unit formed by a second actuatable switch-off unit and the overcurrent protection apparatus, wherein the second switch-off unit is designed to channel the overcurrent to the overcurrent protection apparatus interrupting the flow of current through the second disconnection unit in the activated state;
• and
• a control unit that, in order to disconnect the high-voltage line, is designed to activate at least the second switch-off unit in the case of an overcurrent flowing through the high-voltage line and to activate at least the first switch-off unit in the case of an event independent of an overcurrent, wherein
• the second disconnection unit has a series circuit consisting of the overcurrent protection apparatus and the second switch-off unit,
• the second switch-off unit is designed as a switch that is open in a deactivated state and closed in the activated state,
• the first disconnection unit is connected in parallel with the second disconnection unit, and
• the control unit is designed to activate only the first switch-off unit in the case of the event independent of an overcurrent and to activate the second and the first switch-off unit in the case of the overcurrent flowing through the high-voltage line.

A disconnection device for a high-voltage on-board power system of a motor vehicle for disconnecting a high-voltage line of the high-voltage on-board power system, comprising:

• an overcurrent protection apparatus for interrupting an overcurrent flowing through the high-voltage line;
• a first disconnection unit formed by a first actuatable switch-off unit, wherein the first switch-off unit is designed to interrupt a flow of current through the first disconnection unit in the activated state,
• a second disconnection unit formed by a second actuatable switch-off unit and the overcurrent protection apparatus, wherein the second switch-off unit is designed to channel the overcurrent to the overcurrent protection apparatus interrupting the flow of current through the second disconnection unit in the activated state;
• a control unit that, in order to disconnect the high-voltage line, is designed to activate at least the second switch-off unit in the case of an overcurrent flowing through the high-voltage line and to activate at least the first switch-off unit in the case of an event independent of an overcurrent, and
• a discharge unit for discharging a high-voltage intermediate circuit of the high-voltage on-board power system, which discharge unit is electrically connected to the overcurrent protection apparatus and is able to be electrically connected to the high-voltage intermediate circuit via the overcurrent protection apparatus, wherein
• the disconnection device, in the activated state of the discharge unit, is designed to form a discharge path through the overcurrent protection apparatus and the discharge unit.