Method for providing a supply voltage and electrical drive system

• US 9,698,720 B2
• Filed: 11/26/2013
• Issued: 07/04/2017
• Est. Priority Date: 12/05/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Feuerstack, Peter, Hawliczek, Sebastian
• Primary Examiner(s): Ip, Paul
• Application Number:
  US14/649,283
• Publication Number:
  US 20160218656A1
• Time in Patent Office: 1,316 Days
• Field of Search: 318139, 31840002, 31840012, 320116, 180 658
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: H01M 16/003 of fuel cells with other electrochemical devices, e.g. capacitors, electrolysers
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]

Abstract

The invention relates to an electrical drive system having: an energy storage device for generating a supply voltage and having at least one energy supply line, with one or more energy storage modules connected in series in the energy supply line, each module comprising an energy storage cell module with at least one energy storage cell and a coupling device with a plurality of coupling elements which is designed to selectively connect the energy storage cell module into the respective energy supply line or to bypass the same in the respective energy supply line; a fuel cell system which is coupled to the output terminals of the energy storage device and connected in parallel to the energy storage device; and a control device which is coupled to the energy storage device and is designed to control the coupling devices of the energy storage modules in order to adjust a supply voltage at the output terminals of the energy storage device which corresponds to an output voltage of the fuel cell system.

Claims

1. An electrical drive system, comprising:

an energy storage device for generating a supply voltage, the energy storage device having at least one energy supply line, each energy supply line including one or more energy storage modules connected in series in the energy supply line, each energy supply line including an energy storage cell module with at least one energy storage cell and a coupling device with a plurality of coupling elements configured to connect the energy storage cell module selectively into the respective energy supply line or to bypass the energy storage cell module in the respective energy supply line;

a fuel cell system coupled to the output terminals of the energy storage device or connected in parallel with the energy storage device; and

a control device coupled to the energy storage device, the control device configured to

determine a current output voltage of the fuel cell system, and

actuate the coupling devices of the energy storage modules in order to set at the output terminals of the energy storage device a supply voltage which corresponds to the current output voltage of the fuel cell system.

2. The electrical drive system as claimed in claim 1, further comprising:

at least one storage inductor coupled between one of the output terminals of the energy storage device and the fuel cell system.

3. The electrical drive system as claimed in claim 1, further comprising:

a direct voltage intermediate circuit coupled to the output terminals of the energy storage device and connected in parallel with the energy storage device and the fuel cell system.

4. The electrical drive system as claimed in claim 1, further comprising:

at least one high-voltage load coupled to the output terminals of the energy storage device and connected in parallel with the energy storage device and the fuel cell system.

5. The electrical drive system as claimed in claim 4, wherein the at least one high-voltage load includes a direct voltage transformer which couples the energy storage device and the fuel cell system to a low-voltage power system.

6. The electrical drive system as claimed in claim 1, wherein the control device is configured to detect the current power demand of the electrical drive system and to actuate the coupling devices of the energy storage modules as a function of the determined power demand in order to adapt the output voltage of the energy storage device to the fuel cell system.

7. The electrical drive system as claimed in claim 4, wherein the control device is configured to detect the current power demand of the electrical drive system and to regulate the power consumption of at least one of the high-voltage loads as a function of the determined power demand.

8. The electrical drive system as claimed in claim 1, further comprising:

an inverter coupled to the energy storage device and the fuel cell system and fed thereby with the supply voltage; and

an electric machine is coupled to the power inverter.

9. A method for providing a supply voltage in an electrical drive system, the electrical drive system including

an energy storage device for generating a supply voltage, the energy storage device having at least one energy supply line, each energy supply line including one or more energy storage modules connected in series in the energy supply line, each energy supply line including an energy storage cell module with at least one energy storage cell and a coupling device with a plurality of coupling elements configured to connect the energy storage cell module selectively into the respective energy supply line or to bypass the energy storage cell module in the respective energy supply line,

a fuel cell system coupled to the output terminals of the energy storage device or connected in parallel with the energy storage device, and

a control device coupled to the energy storage device,

the method comprising the steps:

determining, with the control device, the current output voltage of the fuel cell system;

actuating, with the control device, the coupling devices of a first number of energy storage modules of the energy storage device in order to connect the respective energy storage cell modules into the energy supply line;

actuating, with the control device, the coupling devices of a second number of energy storage modules of the energy storage device in order to bypass the respective energy storage cell modules in the energy supply line; and

determining, with the control device, the first and second number of energy storage modules of the energy storage device in such a way that the supply voltage at the output terminals of the energy storage device is adapted to the determined output voltage of the fuel cell system.