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DE-102024003960-B3 - High-voltage electrical system

DE102024003960B3DE 102024003960 B3DE102024003960 B3DE 102024003960B3DE-102024003960-B3

Abstract

The invention relates to an electrical high-voltage system (1) with at least one high-voltage battery (2) comprising a first and a second partial battery (2.1, 2.2) which can be electrically connected in series by means of a switching element (3) and each has a positive terminal (P1, P2) and a negative terminal (N1, N2), wherein the switching element (3) is arranged between the negative terminal (N1) of the first partial battery (2.1) and the positive terminal (P2) of the second partial battery (2.2), wherein at least one high-voltage load (6, 7) is connected with a first connection side to both terminals (P1, N1, P2, N2) of one of the partial batteries (2.1, 2.2), characterized by at least one further high-voltage load (4, 5) with a short-circuit switching capability on a first connection side, which is connected to one of the terminals (P1, P2, N1, N2) of one of the partial batteries (2.1, 2.2) and to the terminal of the same polarity. (P1, P2, N1, N2) is connected to the other sub-battery (2.1, 2.2).

Inventors

  • Urs Boehme
  • Markus Orner
  • Andreas Eichinger

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20241128

Claims (10)

  1. Electrical high-voltage system (1), comprising at least one high-voltage battery (2) having a first and a second sub-battery (2.1, 2.2) electrically connectable in series by means of a switching element (3), each with a positive pole (P1, P2) and a negative pole (N1, N2), wherein the switching element (3) is arranged between the negative pole (N1) of the first sub-battery (2.1) and the positive pole (P2) of the second sub-battery (2.2), wherein at least one high-voltage load (6, 7) is connected with a first connection side to both poles (P1, N1, P2, N2) of one of the sub-batteries (2.1, 2.2), characterized by at least one further high-voltage load (4, 5) with a short-circuit switching capability on a first connection side, which is connected to one of the poles (P1, P2, N1, N2) of one of the sub-batteries (2.1, 2.2) and to the pole of the same pole (P1, P2, N1, N2) is connected to the other sub-battery (2.1, 2.2).
  2. High-voltage electrical system (1) according to Claim 1 , characterized in that at least one first high-voltage consumer (4) with a short-circuit switching option is connected to the positive terminal (P1) of the first partial battery (2.1) and to the positive terminal (P2) of the second partial battery (2.2), and that at least one second high-voltage consumer (5) with a short-circuit switching option is connected to the negative terminal (N1) of the first partial battery (2.1) and to the negative terminal (N2) of the second partial battery (2.2).
  3. High-voltage electrical system (1) according to Claim 1 , characterized in that at least one third high-voltage consumer (6) is connected to the positive terminal (P1) of the first partial battery (2.1) and to the negative terminal (N1) of the first partial battery (2.1), and that at least one fourth high-voltage consumer (7) is connected to the positive terminal (P2) of the second partial battery (2.2) and to the negative terminal (N2) of the second partial battery (2.2).
  4. Electrical high-voltage system (1) according to one of the preceding claims, characterized in that at least one further consumer component (8) is separably connected via main contactors (S_Main_P, S_Main_N) to the positive pole (P1) of the first partial battery (2.1) and to the negative pole (N2) of the second partial battery (2.2).
  5. High-voltage electrical system (1) according to Claim 1 or 2 , characterized in that connections for contacting the poles (P1, N1, P2, N2) of both partial batteries (2.1, 2.2) are brought out of the high-voltage battery (2).
  6. Electrical high-voltage system (1) according to one of the preceding claims, characterized in that the further consumer component (8) is designed as an inverter for a drive motor and/or as another component that is only required for the operation of the vehicle, wherein the high-voltage consumer (4, 5, 6, 7) is designed as an inverter, DC/DC converter, high-voltage heater, electric refrigerant compressor or voltage converter.
  7. Electrical high-voltage system (1) according to one of the preceding claims, characterized in that the high-voltage consumer (4, 5) with short-circuit switching capability on the side of the high-voltage battery (2) has at least one semiconductor switch (S1, S1') or an H-bridge (12) or at least one half-bridge consisting of two semiconductor switches connected electrically in series.
  8. Electrical high-voltage system (1) according to one of the preceding claims, characterized in that the first and second high-voltage consumers (4, 5) and/or the third and fourth high-voltage consumers (6, 7) each have a second connection side on which they are connected to each other.
  9. Electrical high-voltage system (1) according to one of the preceding claims, characterized in that the first and second high-voltage consumers (4, 5) are each designed as an isolated DC/DC converter as part of an AC on-board charger (10) or each as a low-voltage DC/DC converter for a low-voltage on-board power supply (9'), and that the third and fourth high-voltage consumers (6, 7) are each designed as a low-voltage DC/DC converter and are each directly connected to the poles (P1, N1, P2, N2) of each of the partial batteries (2.1, 2.2), wherein both low-voltage DC/DC converters are connected at their output to a respective low-voltage on-board power supply (9) or are connected in parallel to each other and to a common low-voltage on-board power supply (9).
  10. High-voltage electrical system (1) according to Claim 9 , characterized in that at least one low-voltage battery and/or at least one solar panel is connected to the low-voltage electrical system (9').

Description

The invention relates to a high-voltage electrical system according to the preamble of claim 1. In the prior art, switchable batteries for electrically powered vehicles are known, in which two partial batteries with half the battery voltage can be connected either in series at the full battery voltage or in parallel at half the battery voltage. The battery contains all the necessary switching elements to internally implement the series and parallel connections. In this way, the battery can be charged at a charging station that has a lower voltage level than the battery in series. DE 10 2016 008 263 A1 describes a battery arrangement for a motor vehicle, including: - a first electrical energy storage device and at least one second electrical energy storage device; - a charging port and a power supply port; - a first switch by means of which a positive pole of the first electrical energy storage device can be connected to a positive pole of the supply connection; - a third switch by means of which a positive pole of the second electrical energy storage device can be connected to the positive pole of the supply connection; - a fourth switch by means of which a negative pole of the second electrical energy storage device can be connected to a negative pole of the supply connection; and - a fifth switch by means of which the positive pole of the first electrical energy storage device can be connected to the negative pole of the second electrical energy storage device; wherein - the battery arrangement has a second switch by means of which a negative pole of the first electrical energy storage device can be connected to the negative pole of the supply connection; - the battery arrangement has a sixth switch by means of which the negative terminal of the first electrical energy storage device can be connected to the negative terminal of the charging port; and - the battery arrangement has a seventh switch by means of which the positive pole of the second electrical energy storage device can be connected to the positive pole of the charging port. The genre-defining printed publication US 2023 / 0 275 518 A1 This concerns a vehicle electrical system with an AC charging interface for charging a rechargeable energy storage system. A conversion device for bidirectional power conversion is known from this, which has several converter circuits and connects them via a common transformer. The invention is based on the objective of providing a novel high-voltage electrical system. The problem is solved according to the invention by an electrical high-voltage system with the features of claim 1. Advantageous embodiments of the invention are the subject of the dependent claims. An electrical high-voltage system is proposed, comprising at least one high-voltage battery with a first and a second sub-battery, each with a positive and a negative pole, electrically connectable in series by means of a switching element. The switching element is arranged between the negative pole of the first sub-battery and the positive pole of the second sub-battery. At least one high-voltage load is connected to both poles of one of the sub-batteries via a first connection side. According to the invention, at least one further high-voltage load is provided with a short-circuit switching capability on a first connection side, which is connected to one pole of one of the sub-batteries and to the pole of the other sub-battery with the same polarity, in order to short-circuit them. The high-voltage battery, in particular, does not have its own switching elements for this short-circuit switching capability. The at least one further high-voltage load is, in particular, not part of the high-voltage battery. In one embodiment, at least one first high-voltage load with a short-circuit switching capability is connected to the positive terminal of the first partial battery and to the positive terminal of the second partial battery. Furthermore, at least one second high-voltage load with a short-circuit switching capability is connected to the positive terminal of the first partial battery. The negative terminal of the first battery section is connected to the negative terminal of the second battery section. In this way, the batteries sections can be electrically connected in parallel. In one embodiment, at least one third high-voltage load is connected to the positive terminal and the negative terminal of the first battery section. Furthermore, at least one fourth high-voltage load is connected to the positive terminal and the negative terminal of the second battery section. In one embodiment, at least one further consumer component is separably connected via main contactors to the positive pole of the first partial battery and to the negative pole of the second partial battery. In one embodiment, connections for contacting the poles of both sub-batteries are brought out from the high-voltage battery. The sub-batteries can be integrated with the switching e