Search

DE-102024210862-A1 - Thermal management system and motor vehicle with a thermal management system

DE102024210862A1DE 102024210862 A1DE102024210862 A1DE 102024210862A1DE-102024210862-A1

Abstract

The invention relates to a thermal management system (100) of a motor vehicle (200) comprising an electric machine (10), a traction battery (11), an inverter (12) and a coolant circuit (13), wherein the electric machine (10) has a stator (14) with a multiphase stator winding (15), the traction battery (11) is electrically connected to the inverter (12), the inverter (12) has several output phases (171, 172, 173) which are connected to the phases (161, 162, 163) of the multiphase stator winding (15) of the electric machine (10) to generate a rotating magnetic field, and the coolant circuit (13) is designed to carry a cooling medium (22). The coolant circuit (13) incorporates at least one heating element (211, 212, 213) which is electrically connected to the inverter (12) and is arranged to transfer heat to the cooling medium (22). Furthermore, the invention relates to a motor vehicle (200) comprising such a thermal management system (100).

Inventors

  • Peer-Ole Gronwald
  • Stefan Grützner

Assignees

  • VOLKSWAGEN AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20241112

Claims (10)

  1. Thermal management system (100) of a motor vehicle (200), in particular a thermal management system (100) for preconditioning the motor vehicle (200), comprising an electric machine (10), a traction battery (11), an inverter (12) and a coolant circuit (13), wherein the electric machine (10) has a stator (14) with a multiphase stator winding (15), the traction battery (11) is electrically connected to the inverter (12), the inverter (12) has several output phases (171, 172, 173) which are connected to the phases (161, 162, 163) of the multiphase stator winding (15) of the electric machine (10) to generate a rotating magnetic field, and the coolant circuit (13) is designed to carry a cooling medium (22), characterized in that the coolant circuit (13) has at least one heating resistor (211, 212, 213) which is electrically connected to the inverter (12) and is arranged to transfer heat to the cooling medium (22).
  2. Thermal management system (100) according to Claim 1 , wherein the electric machine (10) has a housing (20) which sectionally accommodates the coolant circuit (13).
  3. Thermal management system (100) according to Claim 2 , wherein the at least one heating resistor (211, 212, 213) is arranged in a section of the coolant circuit (13) which is enclosed by the housing (20) of the electric machine (10).
  4. Thermal management system (100) according to one of the preceding claims, wherein the coolant circuit (13) is connected to at least one heat sink (23) for heat dissipation.
  5. Thermal management system (100) according to Claim 4 , where the heat sink (23) is the traction battery (11).
  6. Thermal management system (100) according to one of the preceding claims, wherein the coolant circuit (13) is designed to guide cooling water (221) as the cooling medium (22).
  7. Thermal management system (100) according to one of the preceding claims, wherein the current-conducting connection between the inverter (12) and the at least one heating resistor (211, 212, 213) can be switched by means of an actuator (24) such that the phases (161, 162, 163) of the stator winding (15) are de-energized in the current-energized state of the at least one heating resistor (211, 212, 213).
  8. Thermal management system (100) according to one of the Claims 1 until 6 , wherein the current-conducting connection between the inverter (12) and the heating resistor (211, 212, 213) is switch-free, so that the at least one heating resistor (211, 212, 213) is energized in the energized state of the phases (161, 162, 163) of the stator winding (15).
  9. Thermal management system (100) according to Claim 8 , wherein the at least one heating resistor (211, 212, 213) is connected in parallel to one of the phases (161, 162, 163) of the stator winding (15).
  10. Motor vehicle (200) comprising a thermal management system (100), in particular a thermal management system (100) for preconditioning the motor vehicle (200), with an electric machine (10), a traction battery (11), an inverter (12) and a coolant circuit (13), characterized in that the thermal management system (100) is designed according to one of the Claims 1 until 9 is trained.

Description

The invention relates to a thermal management system of a motor vehicle, in particular a thermal management system for preconditioning the motor vehicle, comprising an electric machine, a traction battery, an inverter and a coolant circuit, wherein the electric machine has a stator with a multiphase stator winding, the traction battery is electrically connected to the inverter, the inverter has several output phases which are connected to the phases of the multiphase stator winding of the electric machine to generate a rotating magnetic field, and the coolant circuit is designed to guide a cooling medium. The invention also relates to a motor vehicle comprising a thermal management system, in particular a thermal management system for preconditioning the motor vehicle, with an electric machine, a traction battery, an inverter and a coolant circuit. The traction battery is typically a high-voltage battery and supplies the inverter with direct current. In electric vehicles, the inverter is usually a pulse-width modulated (PWM) inverter and has three output phases that are electrically connected to three phases of the stator winding in such a way that a rotating magnetic field is generated when the electric motor is operating. A rotor is rotatably mounted inside the stator, which rotates in response to the rotating magnetic field and transmits the rotational motion to a transmission in the vehicle, which is connected to the vehicle's drive wheels. This process converts the electrical energy stored in the traction battery into kinetic energy. In the context of electromobility, preconditioning refers specifically to preheating the traction battery and/or pre-conditioning the vehicle interior before departure. If the traction battery of an electric car is too cold, for example during the cold winter months, especially below 0°C, it can be permanently damaged if regularly charged at an excessively high charging rate. Therefore, common battery management systems reduce the charging power until the traction battery has reached a sufficiently high temperature. Depending on the battery type and cell chemistry, the optimal temperature for the traction battery should be between 25°C and 45°C. To avoid this delay and enable immediate charging of the traction battery at a high charging rate, preconditioning incorporates prior heating of the traction battery. To generate the necessary heat, devices and control systems are provided that, in combination, generate the heat and regulate its distribution within the vehicle. Maintaining the numerous heat-generating devices and suitable control systems is costly, which is why setting and maintaining the ideal temperature distribution during preconditioning represents a significant cost factor. The following is known from the state of the art: Especially in DE 10 2013 012 164 A1 A traction battery system for an electrically powered vehicle is described, comprising a high-voltage battery, a temperature control device for controlling the temperature of the high-voltage battery, a temperature measuring device for detecting the temperature of the high-voltage battery or the ambient temperature of the high-voltage battery, a battery control device, and an electric heating device for directly or indirectly heating the high-voltage battery, wherein the battery control device is configured to direct electrical current generated by recuperative braking below a predefinable threshold temperature of the high-voltage battery or the environment of the high-voltage battery to the heating device. From the DE 10 2022 004 894 B3 A temperature control device for a motor vehicle is known with a refrigerant circuit through which a refrigerant flows, in which at least one refrigerant compressor for compressing the refrigerant, at least one evaporator for evaporating the refrigerant and a cooling heat exchanger around which air flows for cooling the refrigerant are arranged, wherein: • the temperature control device has a temperature control circuit through which a temperature control medium flows, in which at least one electrical or electronic component is arranged which is to be temperature controlled by means of the temperature control medium; • the temperature control device has a third heat exchanger arranged in both the refrigerant circuit and the temperature control circuit, through which the refrigerant and the temperature control medium flow, and which is provided in addition to the evaporator and in addition to the cooling heat exchanger, via which The heat can be exchanged between the refrigerant and the temperature control agent; • in the refrigerant circuit downstream of the third heat exchanger and upstream of the refrigerant compressor, a collector is arranged in which a gas phase of the refrigerant and a liquid phase of the refrigerant can be accommodated simultaneously; • the refrigerant circuit has a first line element that is fluidically connected to the collector and fluidically to