BATTERY MANAGEMENT SYSTEM, METHOD OF CONTROLLING THE SAME, AND ENERGY STORAGE SYSTEM INCLUDING THE BATTERY MANAGEMENT SYSTEM

• US 20110296218A1
• Filed: 03/04/2011
• Published: 12/01/2011
• Est. Priority Date: 05/31/2010
• Status: Active Grant

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Song, Joon-Woo, Kim, Seong-Joong
• Granted Patent: US 8,806,240 B2
• Time in Patent Office: Days
• US Class Current: 713/323
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: H02J 2300/26 involving maximum power point tracking control for photovoltaic sources maximum power point systems in particular G05F1/67
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin
• CPC Class Codes: Y02P 90/50 Energy storage in industry with an added climate change mitigation effect

Abstract

A battery management system (BMS), a method of controlling the same, and an energy storage system including the battery management system. The BMS may reduce costs by stably supplying power to an insulating unit in a power-saving mode even when an isolator has no built-in direct current (DC)-DC converter.

Claims

1. A battery management system comprising:

a battery cell;

an analog front end coupled to a first ground;

a computer coupled to a second ground;

an insulating unit for insulating the analog front end from the computer; and

a first power switching unit for receiving a control signal from the computer through the insulating unit, distributing power of the battery cell according to the control signal, and supplying the distributed power to the insulating unit.

2. The battery management system of claim 1, wherein the analog front end is configured to receive the control signal corresponding to a power-saving mode from the computer through the insulating unit, and turn off a first power supply unit of the analog front end.

3. The battery management system of claim 1, wherein the first power switching unit further comprises:

a transistor configured to be turned on or off according to the control signal; and

a first resistor and a second resistor coupled to a first terminal of the transistor for distributing a voltage of the battery cell.

4. The battery management system of claim 2, further comprising a diode coupled between the first power supply unit and the insulating unit.

5. The battery management system of claim 3, further comprising a third resistor coupled between a second terminal of the transistor and an output terminal of the insulating unit through which the control signal is output.

6. The battery management system of claim 3, wherein:

in response to receiving the control signal corresponding to a power-saving mode from the computer, the insulating unit is configured to output the control signal to the analog front end and the first power switching unit,

in response to receiving the control signal, the analog front end is configured to turn off the first power supply unit in the analog front end, and

in response to receiving the control signal, the first power switching unit is configured to turn on to supply power of the battery cell distributed through the first resistor and the second resistor to the insulating unit.

7. The battery management system of claim 6, wherein the power-saving mode comprises a power-down mode or a shut-down mode.

8. The battery management system of claim 7, wherein:

in response to receiving the control signal corresponding to a normal mode from the computer, the insulating unit is configured to output the control signal to the analog front end and the first power switching unit,

in response to receiving the control signal, the analog front end is configured to turn on the first power supply unit in the analog front end, and supply first power to the insulating unit through the first power supply unit, and

in response to receiving the control signal, the first power switching unit is configured to turn off to stop supply of power of the battery cell to the insulating unit.

9. The battery management system of claim 6, wherein the analog front end is configured to change to the power-saving mode according to the control signal.

10. The battery management system of claim 1, wherein the insulating unit is configured to receive first power from the analog front end, and receive second power from the computer.

11. An energy storage system for converting power generated by a photovoltaic power generation system and supplying the converted power to a grid or a load, or storing the converted power in a battery, supplying power supplied from the grid to the load or converting the supplied power and storing the converted power in the battery, and converting power stored in the battery and supplying the converted power to the grid or the load, the energy storage system comprising a battery management system for controlling charging and discharging of the battery,

wherein the battery management system comprises:

an analog front end for sensing battery information comprising a voltage, a current, and/or a temperature of the battery;

a computer for controlling charging and discharging of the battery based on the battery information;

an insulating unit for insulating the analog front end coupled to a first ground from the computer coupled to a second ground, and respectively receiving first power from the analog front end and second power from the computer; and

a first power switching unit for switching power of the battery according to a control signal output from the computer through the insulating unit and supplying the power of the battery to the insulating unit.

12. The energy storage system of claim 11, wherein the analog front end is configured to receive the control signal corresponding to a power-saving mode from the computer through the insulating unit, and turn off a first power supply unit of the analog front end.

13. The energy storage system of claim 12, wherein the first power switching unit comprises:

a transistor configured to turn on or off according to the control signal; and

a first resistor and a second resistor coupled to a first terminal of the transistor for distributing a voltage of the battery.

14. A method of controlling a battery management system comprising at least one battery cell, an analog front end, a computer, and an insulating unit for insulating the analog front end coupled to a first ground from the computer coupled to a second ground, the method comprising:

receiving a control signal from the computer through the insulating unit;

determining an operation mode of the analog front end according to the control signal; and

supplying a first power and/or a second power to the insulating unit according to the determined operation mode.

15. The method of claim 14, wherein, if the operation mode is a power-saving mode, the supplying of the first power and/or the second power comprises:

supplying a power of the battery cell through a switch; and

supplying the first power obtained by distributing the power of the battery cell to the insulating unit and supplying the second power from the computer to the insulating unit.

16. The method of claim 15, wherein the power-saving mode comprises a power-down mode or a shut-down mode.

17. The method of claim 15, wherein, when the operation mode is a power-saving mode, the method further comprises changing the analog front end to the power-saving mode.

18. The method of claim 14, wherein, when the operation mode is a normal mode,

the supplying of the first power and/or the second power comprises supplying the first power to the insulating unit from a power supply unit included in the analog front end, and supplying the second power to the insulating unit from the computer.