ENERGY STORAGE DEVICE FOR A PHOTOVOLTAIC SYSTEM, AND METHOD FOR OPERATING AN ENERGY STORAGE DEVICE OF A PHOTOVOLTAIC SYSTEM

• US 20140015471A1
• Filed: 07/09/2013
• Published: 01/16/2014
• Est. Priority Date: 07/13/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: MAY, Johanna
• Granted Patent: US 10,381,863 B2
• Time in Patent Office: Days
• US Class Current: 320/101
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 16/00 Structural combinations of different types of electrochemical generators
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 50/30 using light, e.g. lasers
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0025 Sequential battery discharge in systems with a plurality of batteries
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/60 Thermal-PV hybrids
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 80/14 District level solutions, i.e. local energy networks

Abstract

An energy storage device for a photovoltaic system includes: at least one first energy store which has a first cycle stability; at least one second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability; and a control device which is designed to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode.

Claims

1. An energy storage device for a photovoltaic system, comprising:

at least one first energy store which has a first cycle stability;

at least one second energy store which has a second cycle stability, wherein the first cycle stability is higher than the second cycle stability; and

a control device configured to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode.

2. The energy storage device as recited in claim 1, wherein the first operating mode is an operating mode in which the first energy store and the second energy store are chargeable by the photovoltaic system.

3. The energy storage device as recited in claim 2, wherein the second operating mode is an operating mode in which the first energy store and the second energy store are not chargeable by the photovoltaic system.

4. The energy storage device as recited in claim 3, wherein the second operating mode is an operating mode in which the first energy store has a low state of charge.

5. The energy storage device as recited in claim 3, wherein the second operating mode is an operating mode in which there is an increased energy demand by consumers coupled to the first energy store and to the second energy store.

6. The energy storage device as recited in claim 3, wherein the first energy store and the second energy store are configured as electrical accumulators of the same type.

7. The energy storage device as recited in claim 6, wherein the first energy store and the second energy store are configured as one of lead accumulators or lithium-ion accumulators.

8. A control device for an energy storage device, wherein the energy storage device includes at least one first energy store which has a first cycle stability and at least one second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability, the control device comprising:

a first connection for connecting to the at least one first energy store which has the first cycle stability;

a second connection for connecting to the at least one second energy store which has the second cycle stability; and

a control element configured to discharge the first energy store in a first operating mode and to discharge the second energy store in a second operating mode.

9. The control device as recited in claim 8, further comprising:

a human-machine interface configured to enable a user to input user data for establishing at least one of the first and second operating modes.

10. A method for operating an energy storage device of a photovoltaic system, the energy storage device having a first energy store which has a first cycle stability and a second energy store which has a second cycle stability, the first cycle stability being higher than the second cycle stability, the method comprising:

selectively establishing one of a first operating mode or a second operating mode;

discharging the first energy store in the first operating mode; and

discharging the second energy store in the second operating mode.

11. The method as recited in claim 10, wherein the first energy store and the second energy store are configured as lead accumulators, the second energy store in the first operating mode being charged to a state of charge greater than 80% of nominal capacity of the second energy store.

12. The method as recited in claim 10, wherein the first energy store and the second energy store are configured as lithium-ion accumulators, the second energy store in the first operating mode being charged to a state of charge in the range of 50%-70% of nominal capacity of the second energy store.