Electrical system in a motor vehicle and method for heating a battery cell in an electrical system
A technology for electrical systems and battery cells, applied in the field of electrical systems, can solve problems such as power extraction limitations, achieve the effect of reducing driving voltage and eliminating complex modifications
Pending Publication Date: 2022-08-02
VOLKSWAGEN AG
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- Application Information
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Problems solved by technology
At low temperatures, power extraction is limited
Method used
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[0021] figure 1 The electrical system 1 in a motor vehicle is shown in a very simplified manner. The electrical system 1 has a traction grid 2 and an on-board grid 3 with an on-board grid battery 4 . The traction grid 2 has a high-voltage battery 5 with a plurality of battery cells 6 , which are associated with temperature sensors 7 . Furthermore, the traction grid 2 has a pulse inverter 8 and an electric machine 9 . The pulse inverter 8 has a plurality of transistors 10 , which are designed as MOSFETs or IGBTs, for example. Typically, a pulse inverter has six transistors 10, which are connected as a B6 bridge circuit. However, designs with twelve transistors 10 are also known. A temperature sensor 11 and a gate driver assembly 12 are associated with the transistor 10 , wherein the gate driver assembly 12 is connected in data technology to at least one microprocessor 13 . Furthermore, the electrical system 1 has at least one galvanically isolated DC / DC converter 14 , to t...
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The invention relates to an electrical system in a motor vehicle, the system having a traction network and an on-board network, the traction network having a high-voltage battery, a pulse inverter and an electric machine, the high-voltage battery being thermally coupled to a transistor of the pulse inverter, means for detecting the temperature of the battery cells of the high-voltage battery, and a gate driver arrangement being designed to detect the temperature of the battery cells of the high-voltage battery. When the temperature of the battery cell falls below a threshold value, a switch is made to a heating mode in which the gate driver signal for switching on the transistor has a lower voltage than in the normal mode, and at least one galvanically isolated DC / DC converter is provided. The DC / DC converter has an input to which an on-board electrical network voltage is applied and an output to which a drive voltage for the gate driver assembly occurs, the DC / DC converter having a control circuit on the input side, which is designed to reduce the output voltage on the DC / DC converter as a function of a signal for a heating operation. The invention also relates to a method for heating battery cells of at least one high-voltage battery in an electrical system.
Description
technical field [0001] The invention relates to an electrical system in a motor vehicle and a method for heating the cells of at least one high-voltage battery in the electrical system in a motor vehicle. Background technique [0002] Motor vehicles are known which have a traction grid with a high-voltage battery, which in turn has a plurality of battery cells. At low temperatures, power extraction can be limited. It is therefore known to preheat the battery cells. This can be achieved, for example, by means of a separate heating device. Alternatively, it is known to use the heat loss of components already present in a targeted manner, which are then thermally coupled to the battery cells in order to preheat the battery cells in a targeted manner. [0003] An electrical system in a motor vehicle is known from DE 11 2008 000 360 T5, wherein the system has a traction grid and an on-board grid. Furthermore, the traction grid has at least one high-voltage battery, a pulse in...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B60L58/27
CPCB60L58/27B60L2240/545B60K11/02H01M10/625H01M10/667H01M2220/20H01M10/615H01M10/482H01M10/486H01M10/63H01M2010/4271B60K1/04B60K2001/008B60L2210/10
Inventor T.诺克J.U.米勒
Owner VOLKSWAGEN AG