Power management for multi-module energy storage systems in electric, hybrid electric, and fuel cell vehicles

• US 7,859,202 B2
• Filed: 10/23/2007
• Issued: 12/28/2010
• Est. Priority Date: 03/09/2007
• Status: Active Grant

• Current Assignee: Turntide Technologies, Inc.
• Original Assignee: Illinois Institute of Technology
• Inventors: Lukic, Srdjan, Emadi, Ali
• Primary Examiner(s): Duda; Rina I
• Application Number:
  US11/977,118
• Publication Number:
  US 20080218104A1
• Time in Patent Office: 1,162 Days
• Field of Search: 318/139, 363/71, 363/123, 180/65.2, 180/65.3
• US Class Current: 318/139
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: H02J 7/1423 with multiple batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An electric energy storage system (EESS) for providing a power management solution for a multi-subsystem energy storage in electric, hybrid electric, and fuel cell vehicles. The EESS has a controller that determines when to draw power from each subsystem as needed by the vehicle.

Claims

1. A method for implementing an energy storage apparatus coupled with an electric motor/generator in a vehicle, the method comprising:

electrically connecting a controller between at least one converter and the electric motor/generator, the at least one converter including a first converter input electrically connected to a battery and a second converter input electrically connected to an ultracapacitor;

continually monitoring with the controller a state of charge of each of the battery and the ultracapacitor;

storing as parameters the current state of charge of each of the battery and the ultracapacitor with the controller and updating the stored parameters as a function of the continual monitoring;

monitoring with the controller a power demand of the electric motor/generator;

comparing the power demand to the stored parameters and selecting a percentage of the power demand to be supplied by the battery as a function of the stored parameters;

powering the electric motor/generator with the controller using electrical power from at least one of the battery or the ultracapacitor;

determining with the controller a power absorption parameter of each of the battery and the ultracapacitor to determine a recharge requirement of each of the battery and the ultracapacitor;

selecting with the controller at least one of the battery and the ultracapacitor for recharge; and

recharging the at least one of the battery or the ultracapacitor with the controller using electrical power generated by the electric motor/generator.

2. The method according to claim 1, wherein the converter comprises a multi-input bi-directional DC/DC converter.

3. The method according to claim 1, wherein the power demand is determined according to at least one of the parameter, a driving cycle of the vehicle, and the operating state of charge of each of the battery and the ultracapacitor.

4. The method according to claim 1, wherein monitoring with the controller the operating state of charge of each of the battery and the ultracapacitor comprises determining if the operating state of charge of the battery or the ultracapacitor is below a predetermined maximum state of charge.

5. The method according to claim 1, wherein monitoring with the controller the operating state of charge of each of the battery and the ultracapacitor comprises determining if the operating state of charge of the battery or the ultracapacitor is above a predetermined minimum state of charge.

6. The method according to claim 1, wherein the vehicle comprises an internal combustion engine and a driveshaft, wherein the electric motor/generator and the internal combustion engine are coupled with the driveshaft to jointly or alternatively provide rotational motion to the driveshaft.

7. The method according to claim 1, wherein the power absorption parameters of each of the battery and the ultracapacitor are a function of the stored parameters of the current state of charge of each of the battery and the ultracapacitor.

8. The method according to claim 1, wherein as the vehicle brakes to a stop the controller adjusts the power absorption parameter of each of the battery and the ultracapacitor to ensure that the ultracapacitor is fully charged.

9. A method for implementing an energy storage apparatus coupled with an electric motor/generator in a vehicle, the method comprising:

electrically connecting a controller between at least one converter and the electric motor/generator, the at least one converter including a first converter input electrically connected to a first battery and a second converter input electrically connected to a second battery;

monitoring with the controller a power demand of the electric motor/generator;

monitoring with the controller an operating state of charge of each of the first battery and second battery;

powering the electric motor/generator with the controller using electrical power from at least one of the first battery and the second battery;

determining if the first battery needs conditioning; and

conditioning the first battery by sending all charging current from the electric motor/generator to the first battery and drawing power from the second battery to power the electric motor/generator, wherein conditioning the first battery includes charging to an over-charge to break-up sulfate crystals in the first battery.

10. The method according to claim 9, further comprising:

establishing a threshold state of charge for each of the first battery and the second battery;

monitoring with the controller an operating state of charge for each of the first battery and the second battery;

determining the operating state of charge of one of the first battery and the second battery is at or below the threshold state of charge; and

powering the electric motor/generator with an other of the one of the first battery and the second battery when the one of the first battery and the second battery is at or below the threshold state of charge.

11. The method according to claim 10, further comprising directing electrical power with the controller from the electric motor/generator to the one of the first battery and the second battery when the operating state of charge is at or below the threshold state of charge.

12. The method according to claim 9, further comprising directing electrical power with the controller from the electric motor/generator to one of the first battery and the second battery on a predetermined schedule and powering the electric motor/generator with an other of the first battery and the second battery.