ELECTRIC AUTOMOBILE AND DISCHARGING DEVICE THEREOF

• US 20150008866A1
• Filed: 12/31/2012
• Published: 01/08/2015
• Est. Priority Date: 12/31/2011
• Status: Active Grant

• Current Assignee: BYD Company Limited
• Original Assignee: BYD Company Limited, Shenzhen BYD Auto R&D Company Limited (BYD Company Limited)
• Inventors: Wang, Wei, Wang, Hongjun, Li, Zhen, Liu, Ming
• Granted Patent: US 9,796,287 B2
• Time in Patent Office: Days
• US Class Current: 320/104
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/006 to power outlets
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2210/42 Voltage source inverters
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: B60L 2240/529 Current
• 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 2250/12 by confirmation, e.g. of the input
• CPC Class Codes: B60L 2260/22 Standstill, e.g. zero speed
• CPC Class Codes: B60L 2260/26 Transition between different drive modes
• CPC Class Codes: B60L 2270/147 electro magnetic [EMI]
• CPC Class Codes: B60L 2270/20 Inrush current reduction, i.e. avoiding high currents when connecting the battery
• CPC Class Codes: B60L 3/003 relating to inverters
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 50/51 : characterised by AC-motors
• CPC Class Codes: B60L 50/52 : characterised by DC-motors
• CPC Class Codes: B60L 50/60 : using power supplied by batteries in combination with fuel cells B60L50/75
• CPC Class Codes: B60L 53/11 : DC charging controlled by the charging station, e.g. mode 4
• CPC Class Codes: B60L 53/14 : Conductive energy transfer
• CPC Class Codes: B60L 53/16 : Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/18 : Cables specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/20 : characterised by converters located in the vehicle
• CPC Class Codes: B60L 53/22 : Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/24 : Using the vehicle's propulsion converter for charging
• CPC Class Codes: B60L 53/60 : Monitoring or controlling charging stations
• CPC Class Codes: B60L 55/00 : Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: B60L 58/10 : for monitoring or controlling batteries
• CPC Class Codes: B60L 58/12 : responding to state of charge [SoC]
• CPC Class Codes: B60L 58/25 : by controlling the electric load
• CPC Class Codes: H02J 2207/20 : Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2207/40 : adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 2310/48 : for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 3/322 : the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
• CPC Class Codes: H02J 5/00 : Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/0036 : using connection detecting circuits H02J7/0034 takes precedence
• CPC Class Codes: H02J 7/0063 : with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/0068 : Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007182 : in response to battery voltage
• CPC Class Codes: H02J 7/007194 : of the battery
• CPC Class Codes: H02J 7/02 : for charging batteries from ac mains by converters
• CPC Class Codes: H02J 7/342 : The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: H02J 7/345 : using capacitors as storage or buffering devices
• CPC Class Codes: H04B 3/542 : the information being in digital form
• CPC Class Codes: Y02E 60/00 : Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• 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 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 10/92 : Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• 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
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 10/126 : the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/12 : Remote or cooperative charging
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A discharging apparatus for an electric vehicle and an electric vehicle are provided. The discharging apparatus comprises: an AC charging interface; a charging connection device, configured to transmit an AC output from the AC charging interface to another electric vehicle; an instrument, configured to send a discharging preparation instruction; a controller, configured to detect whether the charging connection device is connected with the AC charging interface, and if yes, to emit a PWM wave and to switch to an external discharging mode; a battery manager, configured to control an external discharging circuit in a high-voltage distribution box of the electric vehicle to be connected after the controller switches to the external discharging mode; a power battery, configured to provide a DC via the external discharging circuit.

Claims

1. A discharging apparatus for an electric vehicle, comprising:

an AC charging interface;

a charging connection device, having a first terminal connected with the AC charging interface of the electric vehicle and a second terminal connected with another electric vehicle, and configured to transmit an AC output from the AC charging interface to the another electric vehicle;

an instrument, configured to send a discharging preparation instruction after receiving a trigger signal;

a controller, configured to communicate with the instrument and to detect whether the charging connection device is connected with the AC charging interface after receiving the discharging preparation instruction, and if yes, to emit a PWM wave and to switch to an external discharging mode;

a battery manager, configured to communicate with the controller and to control an external discharging circuit in a high-voltage distribution box of the electric vehicle after the controller switches to the external discharging mode;

a power battery, connected with the high-voltage distribution box and configured to provide a DC via the external discharging circuit in the high-voltage distribution box;

wherein the controller is configured to detect whether the another electric vehicle is fully charged, and if no, the controller converts the DC provided by the external discharging circuit into the AC and to output the AC to the AC charging interface so as to discharge to the another electric vehicle.

2. The discharging apparatus for an electric vehicle according to claim 1, wherein the instrument and the controller communicate via a CAN bus of a local area network of the controller, and the controller and the battery manager communicate via the CAN bus.

3. The discharging apparatus for an electric vehicle according to claim 1, wherein the charging connection device comprises:

a first charging gun, located at the first terminal of the charging connection device and connected with the AC charging interface of the electric vehicle;

a second charging gun, located at the second terminal of the charging connection device and connected with an AC charging interface of the another electric vehicle.

4. The discharging apparatus for an electric vehicle according to claim 1, wherein after it is determined that the charging connection device is connected with the AC charging interface, the controller emits the PWM wave via a CP pin.

5. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is configured to determine whether an electric vehicle is fully charged by detecting a voltage of a CP pin, and if the voltage of the CP pin reaches a predetermined voltage, it is determined that the another electric vehicle has been fully charged.

6. The discharging apparatus for an electric vehicle according to claim 5, wherein the predetermined voltage is 6V.

7. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to detect whether the electric vehicle is currently in P gear after it is determined that the charging connection device is connected with the AC charging interface, and if yes, the controller switches to the external discharging mode.

8. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to detect in real-time whether an internal circuit of the controller has a fault and to detect in real-time whether the another electric vehicle has a fault during discharging.

9. The discharging apparatus for an electric vehicle according to claim 8, wherein the controller is further configured to stop outputting the AC if it is determined that the internal circuit has a fault and/or the another electric vehicle has a fault.

10. The discharging apparatus for an electric vehicle according to claim 1, wherein the battery manager is further configured to detect in real-time a current electric quantity of the power battery and to detect in real-time whether the power battery has a fault, if it is determined the power battery has a fault, the battery manager sends a battery fault instruction to the controller, and the controller stops outputting the AC after receiving the battery fault instruction.

11. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to stop outputting the AC after receiving a discharging finish instruction from the instrument.

12. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to detect a current discharging current in real-time.

13. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to stop outputting the AC, if it is determined that the charging connection device is disconnected with the AC charging interface or the another electric vehicle is fully charged.

14. The discharging apparatus for an electric vehicle according to claim 1, wherein the controller is further configured to detect whether an electric quantity of the electric vehicle is greater than a predetermined value, and if yes, it is determined to allow the electric vehicle to externally discharge.

15. An electric vehicle, comprising a discharging apparatus for an electric vehicle, the discharging apparatus for an electric vehicle comprising:

an AC charging interface;

a charging connection device, having a first terminal connected with the AC charging interface of the electric vehicle and a second terminal connected with another electric vehicle, and configured to transmit an AC output from the AC charging interface to the another electric vehicle;

an instrument, configured to send a discharging preparation instruction after receiving a trigger signal;

a controller, configured to communicate with the instrument and to detect whether the charging connection device is connected with the AC charging interface after receiving the discharging preparation instruction, and if yes, to emit a PWM wave and to switch to an external discharging mode;

a battery manager, configured to communicate with the controller and to control an external discharging circuit in a high-voltage distribution box of the electric vehicle to be connected after the controller switches to the external discharging mode;

a power battery, connected with the high-voltage distribution box and configured to provide a DC via the external discharging circuit in the high-voltage distribution box;

wherein the controller is configured to detect whether the another electric vehicle is fully charged, and if no, the controller converts the DC provided by the external discharging circuit into the AC and to output the AC to the AC charging interface so as to discharge to the another electric vehicle.

16. The electric vehicle according to claim 15, wherein after it is determined that the charging connection device is connected with the AC charging interface, the controller emits the PWM wave via a CP pin.

17. The electric vehicle according to claim 15, wherein the controller is configured to determine whether the another electric vehicle is fully charged by detecting a voltage of a CP pin, and if the voltage of the CP pin reaches a predetermined voltage, it is determined that the another electric vehicle has been fully charged.

18. The electric vehicle according to claim 15, wherein the controller is further configured to detect whether the electric vehicle is currently in P gear after it is determined that the charging connection device is connected with the AC charging interface, and if yes, the controller switches to the external discharging mode.

19. The electric vehicle according to claim 15, wherein the controller is further configured to detect in real-time whether an internal circuit of the controller has a fault and to detect in real-time whether the another electric vehicle has a fault during discharging.

20. The electric vehicle according to claim 19, wherein the controller is further configured to stop outputting the AC if it is determined that the internal circuit has a fault and/or the another electric vehicle has a fault.