Radio frequency energy management system

• US 6,184,656 B1
• Filed: 07/15/1999
• Issued: 02/06/2001
• Est. Priority Date: 06/28/1995
• Status: Expired due to Term

• Current Assignee: Reva Electric Car Company (Pvt) Limited
• Original Assignee: Aevt Incorporated
• Inventors: Bell, David A., Maini, Chetan Kumar, Ryan, Bruce M., Karunasiri, Tissa R.
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): TOATLEY, GREGORY J
• Application Number:
  US09/353,946
• Time in Patent Office: 572 Days
• Field of Search: 320/116, 320/119, 320/122, 320/134, 320/136, 180/65.8, 310/51, 340/510.01, 342/442
• US Class Current: 320/119
• CPC Class Codes: B60L 2200/18 Buses
• CPC Class Codes: B60L 2200/22 Microcars, e.g. golf cars
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2200/42 Fork lift trucks
• CPC Class Codes: B60L 2250/10 by alarm
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: B60L 58/27 by heating
• CPC Class Codes: B60L 8/003 Converting light into electric energy, e.g. by using photo-voltaic systems
• 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: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

A radio frequency energy management system includes a number of battery control modules and/or a control unit that are configured to exchange battery operating parameter/performance information and control signals by radio frequency. Each battery control module includes one or more sensing elements to measure one or more operating parameter of a respective battery, and at least one device selected from the group including a radio frequency receiver, a radio frequency transmitter, a memory device, a controller, control devices, a signal blocking device, and combinations thereof. The control unit is configured to monitor and control the operating parameters of the batteries and includes a radio frequency receiver and a radio frequency transmitter. The control unit evaluates data transmitted from battery control modules according to a predetermined control system program, and transmits a predetermined control command to one or more battery control modules to achieve battery equalization and battery thermal management. The energy management system can also include one or more device for identifying the relative location of a battery control module in the system, and an interface to permit communication with battery control modules by another device independent of the control unit. Radio frequency signals are transmitted between the control unit and each battery control module, and between battery control modules, without additional wiring, thereby eliminating the disadvantages of wired-type systems.

Claims

1. An energy management system for use with an electrically powered apparatus, the system comprising:

a number of battery control modules on the apparatus, wherein each battery control module includes;

means for monitoring at least one operating parameter of an electric power source for the apparatus selected from the group consisting of a battery pack, at least one battery in a battery pack, at least one cell in a battery, and combinations thereof; and

at least one device selected from the group consisting of a radio frequency signal receiving means, a radio frequency transmitting means, a location indicating device, a memory device, a control device, a controller, and combinations thereof; and

a control unit on the apparatus configured to communicate with the battery control modules by radio frequency signal, wherein the control unit includes at least one device selected from the group consisting of a radio frequency signal receiving device, a radio frequency signal transmitting device, a controller, and combinations thereof;

wherein the battery control modules and the control unit are connected to a common conductive transmission medium used to connect an electric power source to a power handling device in the electrically powered apparatus to facilitate radio frequency communication.

2. An energy management system as recited in claim 1 further comprising an interface device connected to the main conductor to facilitating accessing the battery control modules independently of the control unit by other energy management system device.

3. An energy management system as recited in claim 1 wherein each battery control module comprises a radio frequency receiver and a radio frequency transmitter to provide two-way radio frequency communication with at least one of other battery control modules or with the control unit.

4. An energy management system as recited in claim 1 wherein the battery control module control device is selected from the group consisting of an audible indicating device, a visual indicating device, a power source shunt device, a signal blocking device, and combinations thereof.

5. An energy management system as recited in claim 4 wherein the power source shunt device comprises at least one element selected from the group consisting of resistors, thermoelectric devices, and combinations thereof.

6. An energy management system as recited in claim 5 wherein the power source shunt device includes a thermal connection to a heat sink formed from a conductive element of a respective battery.

7. An energy management system as recited in claim 1 further comprising a power source charger located on-board the electrically-powered apparatus, wherein the power source charger is connected to the main conductor, wherein the power source charger is connected to the control unit to perform at least one function selected from the group consisting of receiving control signals from the control unit, retrieving power source operating parameter information from the control unit, retrieving power source operating parameter information from the battery control module, and combinations thereof.

8. An energy management system as recited in claim 1 further comprising a user interface connected to one of the main conductor or control unit for performing at least one function selected from the group consisting of receiving control signals from the control unit, retrieving power source operating parameter information from the control unit, retrieving power source operating parameter information from the battery control module, providing programming information to the control unit, providing programming information to at least one battery control module, and combinations thereof.

9. An energy management system as recited in claim 1 further comprising a battery control module locating device connected to the main conductor for determining the location of at least one battery control module in the energy management system by radio frequency signal.

10. An energy management system as recited in claim 1 wherein the battery control modules are configured to take simultaneous power source voltage readings for subsequent retrieval.

11. An energy management system for use with an electrically powered apparatus, the system comprising:

a number of battery control modules on the apparatus, wherein each battery control module includes;

means for monitoring at least one operating parameter of an electric power source for the apparatus selected from the group consisting of a battery pack, at least one battery in a battery pack, at least one cell in a battery, and combinations thereof; and

at least one device selected from the group consisting of a radio frequency signal receiving device, a radio frequency transmitting device, a memory device, a control device, a controller, and combinations thereof; and

wherein radio frequency receiving and transmitting means for said battery control modules are connected to a common conductive transmission medium, used to connect an electric power source to a power handling device in the electrically powered apparatus, to facilitate radio frequency communication between the battery control modules.

12. An energy management system as recited in claim 11 wherein each battery control module comprises a radio frequency receiver and a radio frequency transmitter to provide two-way radio frequency communication with other battery control modules.

13. An energy management system as recited in claim 11 wherein each battery control module comprises a memory device to store power source operating parameter information therein for subsequent retrieval.

14. An energy management system as recited in claim 13 wherein each battery control module is configured to effect simultaneous voltage monitoring of respective power sources for subsequent retrieval.

15. An energy management system as recited in claim 11 wherein the battery control module control device is selected from the group consisting of an audible indicating device, a visual indicating device, a power source shunt device, a radio frequency signal blocking device, and combinations thereof.

16. An energy management system as recited in claim 15 wherein the power source shunt device is used to shunt current from an electric power source selected from the group consisting of a battery, a battery cell, and combinations thereon, wherein the power source shunt device comprises at least one element selected from the group consisting of resistors, thermoelectric devices, and combinations thereof.

17. An energy management system as recited in claim 16 wherein the power source shunt device includes a thermal connection to a heat sink formed from a conductive element of a respective battery.

18. An energy management system as recited in claim 11 further comprising a control unit comprising at least one of a radio frequency transmitter and a radio frequency receiver that are connected to the main conductor to facilitate radio frequency communication with said battery control modules.

19. An energy management system as recited in claim 18 further comprising an interface device connected to the main conductor to facilitate accessing the battery control modules by radio frequency signal independent of the control unit.

20. An energy management system as recited in claim 18 further comprising a battery control locating device connected to the main conductor to identify relative battery control module location in the energy management system by radio frequency signal.

21. An energy management system for use with an electric vehicle having a battery source of motive power, the system comprising:

a number of battery control modules, wherein each battery control module includes;

at least one monitoring element located on the vehicle and configured to measure an operating parameter of an electric power source selected from the group consisting of a battery pack, at least one battery in a battery pack, at least one cell in a battery, and combinations thereof;

at least one other device selected from the group consisting of a radio frequency receiver, a radio frequency transmitter, a memory device, control devices, a controller, and combinations thereof; and

a control unit located on the vehicle and configured to communicate with the battery control modules by radio frequency signal, wherein the control unit includes a radio frequency receiver and a radio frequency transmitter;

wherein the control unit and battery control modules are connected to a common conductive path attached between the electric power source and a power handling device in the vehicle to facilitate radio frequency communication therebetween.

22. An energy management system as recited in claim 21 further comprising an interface device connected to the main conductor to facilitating accessing the battery control modules by radio frequency signal independently of the control unit by other device.

23. An energy management system as recited in claim 21 wherein each battery control module comprises at least one power source control device, a radio frequency receiver, and a radio frequency transmitter to provide two-way radio frequency communication with at least one of other battery control modules or with the control unit.

24. An energy management system as recited in claim 23 wherein the battery control module power source control device is selected from the group consisting of audible indicating devices, visual indicating devices, power source shunt devices, radio frequency signal blocking devices, and combinations thereof.

25. An energy management system as recited in claim 24 wherein the power source shunt device comprises at least one element selected from the group consisting of resistors, thermoelectric devices, and combinations thereof.

26. An energy management system as recited in claim 21 further comprising a power source charger located on-board the electrically-powered apparatus, wherein the power source charger is connected to the main conductor, wherein the power source charger is connected to the control unit to perform at least one function selected from the group consisting of receiving control signals from the control unit, retrieving power source operating parameter information from the control unit, retrieving power source operating parameter information from the battery control module, and combinations thereof.

27. An energy management system as recited in claim 21 further comprising a battery control module locating device connected to the main conductor for determining the relative location of a battery control module in the energy management system by radio frequency signal.

28. An energy management system as recited in claim 21 further comprising a user interface connected to one of the main conductor or control unit for performing at least one function selected from the group consisting of receiving control signals from the control unit, retrieving power source operating parameter information from the control unit, retrieving power source operating parameter information from the battery control module, providing programming information to the control unit, providing programming information to at least one battery control module, and combinations thereof.

29. An energy management system for use with an electric vehicle having a battery source of motive power, the energy management system comprising:

a number of battery control modules located on the vehicle, wherein each battery control module includes at least one monitoring element for measuring an operating parameter of a respective battery or a battery cell, a radio frequency transmitting device, a radio frequency receiving device and at least one or more device selected from the group consisting of a memory device, a control device, and a controller; and

a control unit located on the electric powered apparatus for communicating with the battery control modules by radio frequency signal, wherein the control unit includes a radio frequency receiver, a controller for evaluating radio frequency signals transmitted from said battery control module and providing a control signal, a radio frequency transmitter for transmitting radio frequency control signal to said battery control module;

wherein the control unit and each battery control module is connected to a common main conductive path, in an electrical system of the vehicle running between batteries in a battery pack and connecting the battery pack to a power handling device in the vehicle, to facilitate radio frequency communication therebetween.

30. An energy management system as recited in claim 29 further comprising an interface device separate from the control unit that is connected to the main conductive path to facilitate accessing the battery control modules by radio frequency signal independent of the control unit.

31. An energy management system as recited in claim 30 further comprising a battery control module locating device connected to the main conductive path for determining the location of one or more battery control module within the energy management system by radio frequency.

32. An energy management system as recited in claim 29 wherein the control device is at least one device selected from the group consisting of audible indicating devices, visual indicating devices, power source shunt devices, radio frequency signal blocking devices, and combinations thereof.

33. An energy management system as recited in claim 32 wherein the power source shunt device is attached across a power source and includes at least one element selected from the group consisting of resistors, thermoelectric devices, and combinations thereof.

34. An energy management system as recited in claim 29 further comprising a power source charger located on-board the electrically-powered apparatus, wherein the power source charger is connected to the main conductive path, wherein the power source charger is connected to the control unit to perform at least one function selected from the group consisting of receiving control signals from the control unit, retrieving power source operating parameter information from the control unit, retrieving power source operating parameter information from the battery control module, and combinations thereof.