CN111532153A - Device and method capable of realizing bidirectional rapid charging capability between electric vehicles - Google Patents
Device and method capable of realizing bidirectional rapid charging capability between electric vehicles Download PDFInfo
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- CN111532153A CN111532153A CN202010301708.6A CN202010301708A CN111532153A CN 111532153 A CN111532153 A CN 111532153A CN 202010301708 A CN202010301708 A CN 202010301708A CN 111532153 A CN111532153 A CN 111532153A
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 16
- 238000001514 detection method Methods 0.000 claims abstract description 47
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000012790 confirmation Methods 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention discloses a device capable of performing bidirectional rapid charging between electric automobiles, which comprises a power battery pack, a BMS, a DCDC conversion module, a vehicle socket and a special cable joint, wherein one end of the special cable joint, which is used for connecting the vehicle socket to be charged, is a vehicle plug provided with a detection resistor, one end of the special cable joint, which is used for connecting a discharge end of a discharge device, is a rapid charging port connector, a first relay is arranged between a total voltage positive end of the power battery pack and the DCDC conversion module, a second relay is arranged between the total voltage positive end of the power battery pack and a positive end of the vehicle socket, a third relay is arranged on a low-voltage auxiliary power supply positive end of the electric automobile, a fifth relay is arranged between the total voltage negative end of the power battery pack and a negative end of the vehicle socket, and a fourth relay is arranged between the BMS and a second charging connection confirmation end of the vehicle socket, a sixth relay is provided between the BMS and the first charging connection confirmation terminal of the vehicle outlet.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a device and a method capable of realizing bidirectional quick charging capacity between electric automobiles.
Background
Electric automobile goes on the road in-process, does not have to come to charge the nest of lying prone on the road, and the solution that needs when this has: 1) the rescue telephone is called, the trailer is contacted, and the vehicle is towed to a nearby charging pile for charging; 2) the method comprises the following steps that a mobile charging vehicle is used, and direct-current quick charging is used for quickly charging the electric vehicle; 3) some electric vehicles/hybrid electric vehicles provide a bidirectional alternating current inversion discharge technology, 220V alternating current can be output, for a fed electric vehicle, an alternating current slow charging gun can be used for accessing the 220V alternating current, and a vehicle-mounted charger charges a power battery, as shown in fig. 1.
The three schemes have the following problems respectively:
for the scheme 1, the cost of the trailer is high and the response speed is low in a mode of dragging the vehicle to the charging pile for charging;
for scheme 2, the number of the mobile charging cars is small, the price is high, and the response speed is low;
for the scheme 3, in the process, the voltage of the power battery needs to be inverted, and the electric vehicle needing to be charged performs the process of converting the PFC (power factor correction) into the required charging voltage, so that the energy loss is large and is limited by the output power of the bidirectional inverter and the power of the vehicle-mounted charger, the charging power is usually not large, and a large amount of time is required for the charging process.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages and drawbacks of the prior art, and providing an apparatus and method for providing bidirectional fast charging capability between electric vehicles.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the device capable of performing bidirectional rapid charging between electric automobiles is arranged on an electric automobile and comprises a power battery pack, a BMS, a DCDC conversion module, a vehicle socket and a special cable joint, wherein one end of the special cable joint, which is used for connecting the vehicle socket to be charged, is a vehicle plug provided with a detection resistor, one end of the special cable joint, which is used for connecting a discharge end of a discharge device, is a rapid charging port connector, a first relay is arranged between a total voltage positive end of the power battery pack and the DCDC conversion module, a second relay is arranged between the total voltage positive end of the power battery pack and a positive end of the vehicle socket, a third relay is arranged on a low-voltage auxiliary power supply positive end of the electric automobile, a fifth relay is arranged between the total voltage negative end of the power battery pack and a negative end of the vehicle socket, and a fourth relay is arranged between a second charging connection confirmation end of the BMS and the vehicle socket, be provided with the sixth relay between BMS and the first charging of vehicle socket connection affirmation end, BMS with first relay, second relay, third relay, fourth relay, fifth relay, sixth relay control are connected.
In a preferred embodiment of the present invention, the detection resistor includes a first detection resistor R2 and a second detection resistor R3, both ends of the first detection resistor R2 are respectively connected in parallel to the vehicle body ground terminal and the first charging connection confirmation terminal of the vehicle socket, and both ends of the second detection resistor R3 are respectively connected in parallel to the vehicle body ground terminal and the second charging connection confirmation terminal of the vehicle socket.
In a preferred embodiment of the present invention, the sixth relay includes a first contact connected to the BMS and one end of a judgment resistor R6, the other end of the judgment resistor R6 being connected to 12V, and a second contact connected to one end of a third detection resistor R4, the other end of the third detection resistor R4 being connected to a body ground of the vehicle outlet.
The method for performing bidirectional quick charging capability between electric vehicles comprises the device for performing bidirectional quick charging capability between electric vehicles according to any one of the technical schemes, and comprises a quick charging mode and a quick discharging mode:
in the fast charging mode, the first relay is disconnected when the electric automobile works normally, and a high-voltage power supply of the DCDC conversion module is disconnected; disconnecting the third relay, and providing a quick charging connection signal for the BMS by the off-board charger; a voltage division circuit consisting of the fourth relay, the second detection resistor R3 and the third detection resistor R4 is closed, and is used for acquiring whether a vehicle plug is inserted into a quick charging socket of the electric vehicle; switching the sixth relay to the second contact, and judging whether the off-board charger is correctly connected with the electric automobile or not through a detection circuit consisting of a resistor R1, a first detection resistor R2 and a third detection resistor R4 of the off-board charger; when a charging gun of the off-board charger is connected to a quick charging port of the electric automobile, a positive terminal signal of the low-voltage auxiliary power supply has a level of 12V, and the BMS judges that the quick charging gun is inserted at the moment and enters a quick charging mode; when the electric automobile is in a power-off state, signals of the positive end of the low-voltage auxiliary power supply and the negative end of the low-voltage auxiliary power supply are also used as wake-up signals of the BMS, and the BMS is started to perform quick charging;
the method comprises the steps that a quick discharge mode is adopted, other electric vehicles are quickly charged, a user needs to set the quick discharge mode through a vehicle machine, the lowest discharge electric quantity is set at the same time, over discharge is prevented, when other electric vehicles are quickly charged, the user needs to use a special cable connector, one end of the special cable connector is inserted into a quick charge plug of the discharging vehicle, the other end of the special cable connector is inserted into a quick charge plug of the charging vehicle, and the electric vehicle capable of outputting quick charge capacity discharges the electric vehicles; after the discharging mode is started, the BMS disconnects the second relay, and the power battery pack is discharged to the outside through the DCDC conversion module; the fourth relay is switched off, and the BMS of the electric automobile to be charged judges whether the quick charging gun is inserted or not through a circuit formed by the self resistor R1 and the second detection resistor R3 of the charging automobile; closing the first relay and providing the first relay for the high-voltage power supply of the DCDC conversion module; the sixth relay is connected with the first contact, and the electric automobile which carries out discharging judges whether the charging gun is correctly inserted into the electric automobile to be charged or not through a circuit consisting of the first detection resistor R2, the third detection resistor R4 and the judgment resistor R6; and closing the third relay to awaken the quick charging function of the charged electric automobile, controlling the output voltage, the output current and the working mode of the DCDC conversion module by the BMS through an internal CAN network after the quick charging communication is established, and outputting the quick charging capacity to the electric automobile by the electric automobile which runs through the off-board charger in the same behavior as the electric automobile.
In a preferred embodiment of the present invention, the fast discharging mode is exited when the electric vehicle capable of outputting the fast charging capability is low in power, the charged vehicle is fully charged, or the two vehicles have serious faults.
Due to the adoption of the technical scheme, the electric automobiles usually consume electric quantity because of different power battery capacities and different electric quantity consumption, and the other automobile still has more electric quantity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of charging an electric vehicle using a bidirectional ac inverter discharge technique.
Fig. 2 is a schematic structural diagram of bidirectional quick charging between electric vehicles.
Fig. 3 is a schematic block diagram of a non-vehicle-mounted charger for fast charging an electric vehicle capable of outputting fast charging capability.
Fig. 4 is a schematic block diagram of an electric vehicle capable of outputting a fast charging capability to charge the electric vehicle.
Fig. 5 is a schematic diagram of a basic scheme of an off-board charger for charging an electric vehicle.
Fig. 6 is a flow chart of fast charging an electric vehicle using an off-board charger.
Fig. 7 is a schematic diagram of a basic scheme of discharging an electric vehicle by an electric vehicle capable of outputting a quick charging capability.
Fig. 8 is a flow chart of the electric vehicle capable of outputting the fast charging capability for fast charging the electric vehicle.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
Referring to fig. 2 to 8, the apparatus capable of performing bidirectional rapid charging between electric vehicles is provided on an electric vehicle, and includes a power battery pack, a BMS (battery management system), a DCDC conversion module, a vehicle outlet, and a dedicated cable connector 100. One end of the special cable connector 100 for connecting to a vehicle socket to be charged is a vehicle plug 110 provided with a detection resistor, and one end of the special cable connector 100 for connecting to a discharge end of a discharge device is a quick charge port connector 120. Generally, an electric vehicle has two charging interfaces, one is a charging interface for ac slow charging, and the other is a charging interface for dc fast charging. The dc fast charging port may allow the dc fast charging pile to charge the electric vehicle, as shown in fig. 3, or may allow the dedicated cable connector 100 to be connected to the fast charging port, and then the other end of the dedicated cable connector is connected to the fast charging port of the electric vehicle to be charged, as shown in fig. 4.
Referring to fig. 5, a first relay K1 is disposed between the positive terminal of the total voltage of the power battery pack and the DCDC conversion module, a second relay K2 is disposed between the positive terminal of the total voltage of the power battery pack and the positive terminal DC + of the vehicle socket, a third relay K3 is disposed on the positive terminal a + of the low-voltage auxiliary power supply of the electric vehicle, a fifth relay K5 is disposed between the negative terminal of the total voltage of the power battery pack and the negative terminal DC + of the vehicle socket, a fourth relay K4 is disposed between the BMS and the second charging connection confirmation terminal CC2 of the vehicle socket, a sixth relay K6 is disposed between the BMS and the first charging connection confirmation terminal CC1 of the vehicle socket, and the BMS is in control connection with the first relay K1, the second relay K2, the third relay K3, the fourth relay K4, the fifth relay K5, and the sixth relay K6.
The detection resistor in the embodiment includes a first detection resistor R2 and a second detection resistor R3, two ends of the first detection resistor R2 are respectively connected in parallel to the body ground PE and the first charging connection confirmation terminal CC1 of the vehicle socket, and two ends of the second detection resistor R3 are respectively connected in parallel to the body ground PE and the second charging connection confirmation terminal CC2 of the vehicle socket. The two charging communication terminals S + and S-are respectively connected with the BMS. The second relay K2 and the fifth relay K5 serve as charging circuit contactors, the seventh relay K7 and the eighth relay K8 serve as direct-current supply circuit contactors, and resistors R2 and R3 are mounted on the vehicle plug.
The sixth relay K6 includes a first contact 1 and a second contact 2, the first contact 1 is connected to the BMS and one end of a judgment resistor R6, the other end of the judgment resistor R6 is connected to 12V, the second contact 2 is connected to one end of a third detection resistor R4, and the other end of the third detection resistor R4 is connected to the body ground PE of the vehicle outlet. One end of the resistor R5 is connected to the fourth relay K4, and the other end is connected to 12V.
The method for carrying out bidirectional quick charging capability between electric vehicles comprises the device for carrying out bidirectional quick charging capability between electric vehicles, and comprises a quick charging mode and a quick discharging mode:
in the fast charging mode, as shown in fig. 5 and fig. 6, when the electric vehicle normally operates, the first relay K1 is turned off, and the high-voltage power supply of the DCDC conversion module is turned off; the third relay K3 is disconnected, and the non-vehicle-mounted charger provides a BMS quick charging connection signal; closing a voltage division circuit consisting of the fourth relay K4, the second detection resistor R3 and the third detection resistor R4 and acquiring whether a vehicle plug is inserted into a quick charging socket of the electric vehicle or not; switching a sixth relay K6 to a second contact 2, and judging whether the off-board charger is correctly connected to the electric automobile or not through a detection circuit consisting of a resistor R1, a first detection resistor R2 and a third detection resistor R4 of the off-board charger; when a charging gun of the off-board charger is connected to a quick charging port of the electric automobile, a positive terminal A + signal of the low-voltage auxiliary power supply has a level of 12V, and the BMS judges that the quick charging gun is inserted at the moment and enters a quick charging mode; when the electric automobile is in a power-off state, the signals of the positive end A + and the negative end A-of the low-voltage auxiliary power supply are also used as wake-up signals of the BMS, and the BMS is started to perform quick charging.
Referring to fig. 7 and 8, in the fast discharging mode, other electric vehicles are fast charged, a user needs to set the electric vehicle on the vehicle, and set the lowest discharging electric quantity to prevent over-discharging, when the other electric vehicles are fast charged, the user needs to use the special cable connector 100, one end of the special cable connector 100 is inserted into a fast charging plug of the discharging vehicle, the other end of the special cable connector 100 is inserted into a fast charging plug of the charging vehicle, and the electric vehicle capable of outputting fast charging capability discharges the electric vehicle; after the discharging mode is started, the BMS disconnects the second relay K2, and the power battery pack is discharged outside through the DCDC conversion module; the fourth relay K4 is switched off, and the BMS of the electric automobile to be charged judges whether the quick charging gun is inserted or not through a circuit formed by the self resistor R1 and the second detection resistor R3 of the charging automobile; closing the first relay K1 and providing the first relay K1 for the high-voltage power supply of the DCDC conversion module; the sixth relay K6 is connected with the first contact 1, and the electric vehicle which carries out discharging judges whether the charging gun is correctly inserted into the electric vehicle to be charged or not through a circuit consisting of the first detection resistor R2, the third detection resistor R4 and the judgment resistor R6; and closing the third relay K3 to awaken the quick charging function of the charged electric automobile, controlling the output voltage, the output current and the working mode of the DCDC conversion module by the BMS through an internal CAN network after the quick charging communication is established, wherein the running behavior is equal to that of an off-board charger at the moment, and the electric automobile capable of outputting the quick charging capacity CAN carry out quick charging on the electric automobile.
If the electric automobile capable of outputting the quick charging capacity is insufficient in electric quantity, the charged vehicle is fully charged or the two vehicles have serious faults, the quick discharging mode is exited.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The device capable of performing bidirectional rapid charging between electric automobiles is arranged on an electric automobile and comprises a power battery pack, a BMS, a DCDC conversion module and a vehicle socket and is characterized by also comprising a special cable joint, wherein one end of the special cable joint, which is used for connecting the vehicle socket to be charged, is a vehicle plug provided with a detection resistor, one end of the special cable joint, which is used for connecting a discharge end of a discharge device, is a rapid charging port connector, a first relay is arranged between a total voltage positive end of the power battery pack and the DCDC conversion module, a second relay is arranged between the total voltage positive end of the power battery pack and a positive end of the vehicle socket, a third relay is arranged on a low-voltage auxiliary power supply positive end of the electric automobile, and a fifth relay is arranged between the total voltage negative end of the power battery pack and a negative end of the vehicle socket, be provided with the fourth relay between BMS and the second charging of vehicle socket is connected and is confirmed the end, be provided with the sixth relay between BMS and the first charging of vehicle socket is connected and is confirmed the end, BMS with first relay, second relay, third relay, fourth relay, fifth relay, sixth relay control are connected.
2. The apparatus for enabling bidirectional fast charging between electric vehicles according to claim 1, wherein the detection resistor comprises a first detection resistor R2 and a second detection resistor R3, the two ends of the first detection resistor R2 are respectively connected in parallel to the body ground terminal of the vehicle socket and the first charging connection confirmation terminal, and the two ends of the second detection resistor R3 are respectively connected in parallel to the body ground terminal of the vehicle socket and the second charging connection confirmation terminal.
3. The apparatus for enabling bidirectional rapid charging between electric vehicles according to claim 1, wherein the sixth relay includes a first contact connected to the BMS and one end of a judging resistor R6, the other end of the judging resistor R6 being connected to 12V, and a second contact connected to one end of a third detecting resistor R4, the other end of the third detecting resistor R4 being connected to a body ground of the vehicle outlet.
4. A method for performing bidirectional fast charging capability between electric vehicles, comprising the apparatus for performing bidirectional fast charging capability between electric vehicles according to any one of claims 1 to 3, comprising a fast charging mode and a fast discharging mode:
in the fast charging mode, the first relay is disconnected when the electric automobile works normally, and a high-voltage power supply of the DCDC conversion module is disconnected; disconnecting the third relay, and providing a quick charging connection signal for the BMS by the off-board charger; a voltage division circuit consisting of the fourth relay, the second detection resistor R3 and the third detection resistor R4 is closed, and is used for acquiring whether a vehicle plug is inserted into a quick charging socket of the electric vehicle; switching the sixth relay to the second contact, and judging whether the off-board charger is correctly connected with the electric automobile or not through a detection circuit consisting of a resistor R1, a first detection resistor R2 and a third detection resistor R4 of the off-board charger; when a charging gun of the off-board charger is connected to a quick charging port of the electric automobile, a positive terminal signal of the low-voltage auxiliary power supply has a level of 12V, and the BMS judges that the quick charging gun is inserted at the moment and enters a quick charging mode; when the electric automobile is in a power-off state, signals of the positive end of the low-voltage auxiliary power supply and the negative end of the low-voltage auxiliary power supply are also used as wake-up signals of the BMS, and the BMS is started to perform quick charging;
the method comprises the steps that a quick discharge mode is adopted, other electric vehicles are quickly charged, a user needs to set the quick discharge mode through a vehicle machine, the lowest discharge electric quantity is set at the same time, over discharge is prevented, when other electric vehicles are quickly charged, the user needs to use a special cable connector, one end of the special cable connector is inserted into a quick charge plug of the discharging vehicle, the other end of the special cable connector is inserted into a quick charge plug of the charging vehicle, and the electric vehicle capable of outputting quick charge capacity discharges the electric vehicles; after the discharging mode is started, the BMS disconnects the second relay, and the power battery pack is discharged to the outside through the DCDC conversion module; the fourth relay is switched off, and the BMS of the electric automobile to be charged judges whether the quick charging gun is inserted or not through a circuit formed by the self resistor R1 and the second detection resistor R3 of the charging automobile; closing the first relay and providing the first relay for the high-voltage power supply of the DCDC conversion module; the sixth relay is connected with the first contact, and the electric automobile which carries out discharging judges whether the charging gun is correctly inserted into the electric automobile to be charged or not through a circuit consisting of the first detection resistor R2, the third detection resistor R4 and the judgment resistor R6; and closing the third relay to awaken the quick charging function of the charged electric automobile, controlling the output voltage, the output current and the working mode of the DCDC conversion module by the BMS through an internal CAN network after the quick charging communication is established, and outputting the quick charging capacity to the electric automobile by the electric automobile which runs through the off-board charger in the same behavior as the electric automobile.
5. The method of claim 4, wherein the fast discharging mode is exited when the electric vehicle outputting the fast charging capability is low, the charged vehicle is fully charged, or the two vehicles have a serious failure.
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| CN202010301708.6A CN111532153A (en) | 2020-04-16 | 2020-04-16 | Device and method capable of realizing bidirectional rapid charging capability between electric vehicles |
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| CN202010301708.6A CN111532153A (en) | 2020-04-16 | 2020-04-16 | Device and method capable of realizing bidirectional rapid charging capability between electric vehicles |
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