Energy storage system and method for operating same

• US 9,160,181 B2
• Filed: 10/28/2010
• Issued: 10/13/2015
• Est. Priority Date: 12/17/2009
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Butzmann, Stefan, Fink, Holger
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): BOATENG, ALEXIS ASIEDUA
• Application Number:
  US13/516,569
• Publication Number:
  US 20120306468A1
• Time in Patent Office: 1,811 Days
• Field of Search: 323/304, 320/116, 320/118, 320/134, 320/119, 320/120, 320/122, 320/126, 320/130, 320/140, 324/433, 324/426, 324/429, 324/430, 324/434
• US Class Current: 1/1
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An energy supply system including an electrical energy storage system having multiple storage modules, in particular a battery system, an ascertaining device for ascertaining state variables of the storage modules and an energy transmission device for energy transmission between the storage modules and a downstream electrical device. It is provided that the energy transmission device has multiple d.c. chopper converters, which are connected to one another in parallel and/or in series at the output end, and each of the d.c. chopper converters is connectable to a storage module of the energy storage system, and the energy supply system has a trigger device for triggering the d.c. chopper converters as a function of the ascertained state variable of the respective connected storage module. Also described is a method for operating an energy supply system.

Claims

1. An energy supply system, comprising:

an electrical energy storage system having multiple storage modules;

an ascertaining device for ascertaining state variables of the storage modules; and

an energy transmission device for energy transmission between the storage modules and a downstream electrical device;

wherein the energy transmission device has multiple d.c. chopper converters connected to one another in series at the output end, and each of the d.c. chopper converters is connectable at its inputs to one of the storage modules of the energy storage system,

wherein the energy supply system has a trigger device for triggering the d.c. chopper converters as a function of the ascertained state variable of a respective connected storage module, and

wherein the input of each d.c. chopper converter is at the same electric potential.

2. The energy supply system of claim 1, wherein the trigger device is a trigger device for triggering the d.c. chopper converters as a function of a power demand on the energy storage system.

3. The energy supply system of claim 1, wherein a state variable of the storage modules is at least one of a state of charge and a state of health of the respective storage module.

4. The energy supply system of claim 1, wherein the ascertaining device has a computation device in which at least one evaluation arrangement is stored, the computation device determining the state variable of this storage module by comparison of at least one measured parameter of one of the storage modules with an assigned reference parameter of the evaluation arrangement.

5. The energy supply system of claim 1, wherein the parameter is a module voltage which may be picked up at the respective storage module.

12. The energy supply system of claim 1, wherein the electrical energy storage system having multiple storage modules is a battery system.

13. The energy supply system of claim 1, wherein the ascertaining device has a computation device in which at least one evaluation arrangement, which is a mathematical model of the storage modules, is stored, the computation device determining the state variable of this storage module by comparison of at least one measured parameter of one of the storage modules with an assigned reference parameter of the evaluation arrangement.

14. The energy supply system of claim 1, wherein the energy transmission device has multiple d.c. chopper converters connected to one another in parallel at the output end, and each of the d.c. chopper converters is connectable at its inputs to one of the storage modules of the energy storage system.

6. A method for operating an energy supply system, the method comprising:

triggering each one of d.c. chopper converters for operating the energy supply system at least as a function of an ascertained state variable of a storage module connected to the d.c. chopper converter;

wherein the energy supply system, includes;

an electrical energy storage system having multiple ones of the storage modules;

an ascertaining device for ascertaining state variables of the storage modules; and

an energy transmission device for energy transmission between the storage modules and a downstream electrical device, wherein the energy transmission device has multiple d.c. chopper converters connected in series at the output end and each of the d.c. chopper converters is connectable at its inputs to one of the storage modules of the energy storage system,

wherein the energy supply system has a trigger device for triggering the d.c. chopper converters as a function of the ascertained state variable of a respective connected storage module, and

wherein the input of each d.c. chopper converter is at the same electric potential.

7. The method of claim 6, wherein the triggering of the d.c. chopper converters takes place as a function of a power demand on the energy storage system.

8. The method of claim 6, wherein the state variable of the storage modules is at least one of a state of charge and a state of health of the respective storage module.

9. The method of claim 6, wherein the ascertaining device has a computation device in which at least one evaluation arrangement is stored, the computation device determining the state variable of this storage module by comparing at least one measured parameter of one of the storage modules with an assigned reference parameter of the evaluation arrangement.

10. The method of claim 6, wherein the parameter is a module voltage which may be picked up at the respective storage module.

11. The method of claim 6, wherein the ascertaining device has a computation device in which at least one evaluation arrangement, which is a mathematical model of the storage modules, is stored, the computation device determining the state variable of this storage module by comparing at least one measured parameter of one of the storage modules with an assigned reference parameter of the evaluation arrangement.

15. The method of claim 6, wherein the energy transmission device has multiple d.c. chopper converters connected in parallel at the output end and each of the d.c. chopper converters is connectable at its inputs to one of the storage modules of the energy storage system.