Abstract: An electrical circuit for a vehicle high-voltage network, the network including two electrical stores. The circuit includes first and second connection points for electrical connection to a load and/or charging device, a first switch between a first pole connector, for electrical contacting a first pole of a first electrical store, and the first connection point, a second switch between a second pole connector, for electrical contacting a second pole of a second electrical store, and the second connection point, a third switch between the first pole connector and a third pole connector, for electrical contacting a first pole of the second electrical store, and a fourth switch between the second pole connector and a fourth pole connector, for electrical contacting a second pole of the first electrical store. The switches are switchable between connecting and separating states. The first and/or second switches galvanically separate in the separating state.

Abstract: An electric circuit for a high-voltage network of a vehicle. the high-voltage network includes at least two electrical energy stores. The electric circuit includes a first and second connection points, which are configured for electrical connection to a consumer (19) and/or a charger (21). A first switching unit is arranged between a first pole connector and the first connection point. A second switching unit is arranged between a second pole connector and the second connection point. A third switching unit is arranged between the first connection point and a third pole connector, and a fourth switching unit is arranged between the second connection point and a fourth pole connector. The first switching unit and/or the second switching unit are designed to be galvanically isolating in an electrically disconnecting state, and the third and fourth switching units are embodied as semiconductor components.

Abstract: A diagnostic circuit (60) for diagnosing a battery disconnect unit (100) for disconnecting a battery system (200) from an electrical system (300). The battery disconnect unit (100) includes a first switching element (S1) and a second switching element (S2). A first connection of the first switching element (S1) is connected to a first node point (8), and a second connection of the first switching element (S1) is connected to the first terminal (2). A first connection of the second switching element (S2) is connected to the first node point (8), and a second connection of the second switching element (S2) is connected to the second terminal (4). The diagnostic circuit (60) includes a first voltage divider (61) and a second voltage divider (62).

Abstract: A battery disconnect unit (100) for disconnecting a battery system (200) comprising at least one battery cell (5), from an electrical system (300). The battery disconnect unit (100) comprises a first terminal (2), a second terminal (4), a first switching element (S1), a second switching element (S2) and a current sensing resistor (6). A first connection of the first switching element (S1) is connected to a first connection of the current sensing resistor (6), and a second connection of the first switching element (S1) is connected to the first terminal (2). A first connection of the second switching element (S2) is connected to a second connection of the current sensing resistor (6), and a second connection of the second switching element (S2) is connected to the second terminal (4).

Abstract: The invention relates to a battery system (10) for an electric vehicle, comprising a battery pack (5) having a positive pole (22), a negative pole (21), at least one battery cell (2) and a pack voltage divider (25), and comprising at least one coupling network having a negative terminal (11) and a positive terminal (12), wherein the pack voltage divider (25) comprises a positive pack resistor (RP2) and a positive sub-pack-resistor (RSP2) which are connected to one another in series between the positive pole (22) and a reference point (50), and a negative pack resistor (RP1) and a negative sub-pack-resistor (RSP1) which are connected to one another in series between the negative pole (21) and the reference point (50).

Abstract: A battery system having a battery pack with a negative pole, a positive pole and a battery cell, a coupling network having a first negative terminal and a first positive terminal, a pack voltage divider, and a coupling voltage divider. The first positive terminal is connectable to the positive pole via a switch. Optionally, the first negative terminal is connectable to the negative pole via a switch. The pack voltage divider includes a two resistors connected between the positive pole and a first reference point. A negative pack measurement resistor and a negative sub-pack measurement resistor are dis-connectable from the negative pole or the first reference point via a switch. A positive coupling measurement resistor and a positive sub-coupling measurement resistor are connected between the first positive terminal and the first reference point. Two resistors are connected between the first negative terminal and the first reference point.

Abstract: A method for detecting an internal short circuit in a first electrical energy storage unit of an electrical energy storage device is described, wherein the electrical energy storage device comprises at least two electrical energy storage units including a first electrical energy storage unit and a second electrical energy storage unit electrically connected in parallel in the electrical energy storage device, the method including recording an electric current flowing into or out of the first electrical energy storage unit, recording an electric current flowing into or out of the second electrical energy storage unit, determining a short-circuit current in the first electrical energy storage unit based on the at least two recorded electric currents, and detecting an internal short circuit when the magnitude of the short-circuit current exceeding a predefined short-circuit current threshold.

Abstract: A method for detecting an internal short circuit in a first electrical energy storage unit of an electrical energy storage device is described, wherein the electrical energy storage device comprises at least two electrical energy storage units including a first electrical energy storage unit and a second electrical energy storage unit electrically connected in parallel in the electrical energy storage device, the method including recording an electric current flowing into or out of the first electrical energy storage unit, recording an electric current flowing into or out of the second electrical energy storage unit, determining a short-circuit current in the first electrical energy storage unit based on the at least two recorded electric currents, and detecting an internal short circuit when the magnitude of the short-circuit current exceeding a predefined short-circuit current threshold.