CN114336886A

CN114336886A - Extended range charging system and method

Info

Publication number: CN114336886A
Application number: CN202210020779.8A
Authority: CN
Inventors: 冯伟
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Geely New Energy Commercial Vehicle Group Co Ltd; Geely Sichuan Commercial Vehicle Co Ltd; Zhejiang Geely New Energy Commercial Vehicle Development Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Geely Sichuan Commercial Vehicle Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-04-12

Abstract

The invention discloses a range-extending charging system and method, and belongs to the technical field of charging. The invention relates to a range extending charging system, which comprises a vehicle control unit, a charging control circuit and a range extender, wherein the vehicle control unit acquires the connection state of a fault vehicle, generates a charging control signal according to the connection state, the charging control circuit disconnects a self-charging switch according to the charging control signal and closes a rescue charging switch, the vehicle control unit acquires the real-time battery capacity of the fault vehicle when the rescue charging switch is closed, generates a constant-current charging signal according to the real-time battery capacity, the range extender generates a corresponding charging current according to the constant-current charging signal and outputs the charging current to the fault vehicle to realize the range extending charging of the fault vehicle, the vehicle control unit controls the switch in the charging control circuit to be closed to conduct a charging circuit from the range extender to the fault vehicle, the range extender generates a constant-current charging signal according to the real-time battery capacity to charge the fault vehicle without configuring a large-capacity battery, the charging safety is improved.

Description

Extended range charging system and method

Technical Field

The invention relates to the technical field of charging, in particular to a range-extending charging system and method.

Background

With the development of the electric automobile industry, more and more electric automobiles provide convenience for people to go out. Electric automobile need fill and trade electric infrastructure and charge, fills electric infrastructure and usually for filling electric pile, fills the unable removal of stake position, stake number less of electric pile, and electric automobile half way easily leads to can't traveling to filling electric pile electricity supplement recently because of the electric quantity is not enough or the trouble, still needs the storage battery car to charge to the breakdown vehicle rescue this moment.

At present, the existing rescue scheme of the charging vehicle in the market generally arranges a large number of large-capacity batteries in a container, and the large-capacity batteries are used for charging the fault vehicle. During charging or moving, the large-capacity battery is difficult to avoid the situations of collision, heating or short circuit caused by friction and the like, so that the charging equipment where the large-capacity battery is located is easy to break down, and even accidents are caused.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a range-extending charging system and method, and aims to solve the technical problem that the safety of power supplement of a fault vehicle by adopting a high-capacity battery in the prior art is poor.

In order to achieve the purpose, the invention provides a range extending type charging system, which comprises a vehicle control unit, a charging control circuit and a range extending device, wherein a control end of the vehicle control unit is respectively connected with a control end of the charging control circuit and a control end of the range extending device, a current output end of the range extending device is connected with a current input end of the charging control circuit, and a current output end of the charging control circuit is connected with a current input end of a fault vehicle;

the vehicle control unit is used for acquiring the connection state of the fault vehicle, generating a charging control signal according to the connection state and sending the charging control signal to the charging control circuit;

the charging control circuit is used for disconnecting the self-charging switch according to the charging control signal and closing the rescue charging switch;

the vehicle control unit is used for acquiring the real-time battery capacity of the fault vehicle when the rescue charging switch is closed, generating a constant current charging signal according to the real-time battery capacity, and sending the constant current charging signal to the range extender;

the range extender is used for generating corresponding charging current according to the constant current charging signal and outputting the charging current to the charging control circuit, so that the charging control circuit outputs the charging current to a charging interface of the fault vehicle, and the range-extending charging of the fault vehicle is realized.

Optionally, the charging control circuit comprises a range extender fuse, a quick-charging contactor, a quick-charging fuse and a quick-charging interface, wherein a constant-current output end of the range extender is connected with a first end of the quick-charging contactor, a second end of the quick-charging contactor is connected with a current input end of the quick-charging interface, and a current output end of the quick-charging interface is connected with the quick-charging interface of the fault vehicle;

the quick charging contactor is used for closing a rescue charging switch according to the charging control signal;

the quick charging contactor is also used for outputting the charging current generated by the range extender to the quick charging interface when the rescue charging switch is closed;

and the quick charging interface is used for outputting the charging current to the charging interface of the fault vehicle.

Optionally, the charging control circuit further includes a range extender fuse and a quick charging fuse;

the constant current output end of the range extender is connected with the first end of the range extender fuse, the second end of the range extender fuse is connected with the first end of the quick-charging contactor, the second end of the quick-charging contactor is connected with the first end of the quick-charging fuse, and the second end of the quick-charging fuse is connected with the current input end of the quick-charging interface.

Optionally, the extended-range charging system further includes a storage battery and a dc converter, an anode of the storage battery is connected to an anode of the dc converter, a cathode of the dc converter is connected to a cathode of the storage battery, and a current output end of the dc converter is connected to a current input end of the charging control circuit;

the storage battery is used for outputting storage battery current to the direct current converter when the rescue charging switch is closed and the range extender is not started;

the direct current converter is used for converting the current of the storage battery into direct current charging current and outputting the direct current charging current to the charging control circuit, so that the charging control circuit outputs the direct current charging current to a charging interface of the fault vehicle.

Optionally, the extended range charging system further includes a V2V dc cable, a current output end of the charging control circuit is connected to a first charging end of the V2V dc discharging cable, a second charging end of the V2V dc cable is connected to a fast charging interface of the faulty vehicle, and a signal output end of the V2V dc cable is wirelessly connected to a signal input end of the vehicle controller;

the V2V direct-current discharging cable is used for detecting the connection state of the fault vehicle and sending the connection state to the vehicle control unit so that the vehicle control unit generates a charging control signal according to the connection state;

the V2V direct-current discharging cable is further used for acquiring the real-time battery capacity of the fault vehicle through a charging communication protocol and sending the real-time battery capacity to the vehicle control unit, so that the vehicle control unit generates a constant-current charging signal according to the real-time battery capacity;

the V2V direct current discharging cable is further used for outputting the charging current generated by the range extender to a charging interface of the fault vehicle.

Optionally, the V2V dc cable includes a first charging gun, a second charging gun, and an on-cable control box, a current input end of the first charging gun is connected to a current output end of the charging control circuit, a current output end of the first charging gun is connected to a current input end of the on-cable control box, a current output end of the on-cable control box is connected to a current input end of the second charging gun, a current output end of the second charging gun is connected to a current input end of the second charging gun, and a signal output end of the on-cable control box is wirelessly connected to a signal input end of the vehicle controller;

the on-cable control box is used for detecting the connection state of the fault vehicle and sending the connection state to the vehicle control unit so that the vehicle control unit generates a charging control signal according to the connection state;

the on-cable control box is further used for acquiring the real-time battery capacity of the fault vehicle through a charging communication protocol and sending the real-time battery capacity to the vehicle control unit so that the vehicle control unit generates a constant-current charging signal according to the real-time battery capacity;

the first charging gun is used for outputting the charging current generated by the range extender to the on-cable control box so that the on-cable control box outputs the charging current to the second charging gun;

and the second charging gun is used for outputting the charging current to a charging interface of the fault vehicle.

Optionally, the first charging gun includes a high-voltage positive input interface, a high-voltage negative input interface, a direct-current positive input interface, a direct-current negative input interface, a first input end connection confirmation interface, a second input end connection confirmation interface, a CAN bus high-voltage input interface, a CAN bus low-voltage input interface, an input end ground wire interface, an input end locking module, a first resistor, and a first switch;

the current input end of the high-voltage positive input interface, the current input end of the high-voltage negative input interface, the current input end of the direct-current positive input interface, the current input end of the direct-current negative input interface, the current input end of the first input end connected with the confirmation interface, the current input end of the second input end connected with the confirmation interface, the current input end of the CAN bus high-voltage input interface and the current input end of the CAN bus low-voltage input interface are respectively connected with the current output end of the charging control circuit;

the current output end of the high-voltage positive input interface, the current output end of the high-voltage negative input interface, the current output end of the direct-current positive input interface, the current output end of the direct-current negative input interface, the current output end of the first input end connected with the confirmation interface, the current output end of the second input end connected with the confirmation interface, the current output end of the CAN bus high-voltage input interface and the current output end of the CAN bus low-voltage input interface are respectively connected with the current input end of the input end ground wire interface and the current input end of the on-cable control box, and the current output end of the input end ground wire interface is connected with the grounding end of the charging control circuit;

the signal input part of the input end locking module is wirelessly connected with the signal output part of the on-cable control box, the first end of the first switch is connected with the current output part of the first input end connection confirmation interface, the second end of the first switch is connected with the first end of the first resistor, and the second end of the first resistor is connected with the current input part of the input end ground wire interface.

Optionally, the second charging gun includes a high-voltage positive output interface, a high-voltage negative output interface, a direct-current positive output interface, a direct-current negative output interface, a first output end connection confirmation interface, a second output end connection confirmation interface, a CAN bus high-voltage output interface, a CAN bus low-voltage output interface, an output end ground wire interface, an output end locking module, a second resistor, a third resistor, and a second switch;

the current input end of the high-voltage positive output interface, the current input end of the high-voltage negative output interface, the current input end of the direct-current positive output interface, the current input end of the direct-current negative output interface, the current input end of the CAN bus high-voltage output interface, the current input end of the CAN bus low-voltage output interface and the current input end of the output end ground wire interface are respectively connected with the current output end of the on-cable control box;

the current output end of the high-voltage positive output interface, the current output end of the high-voltage negative output interface, the current output end of the direct-current positive output interface, the current output end of the direct-current negative output interface, the current output end of the CAN bus high-voltage output interface, the current output end of the CAN bus low-voltage output interface and the current output end of the output end ground wire interface are respectively connected with the quick charging interface of the fault vehicle;

the first output end is connected with a current input end of a confirmation interface, the second output end is connected with a current input end of the confirmation interface, and the current input end of the confirmation interface is respectively connected with the quick charging interface of the fault car;

the signal input part of output locking module with the signal output part wireless connection of control box on the cable, the first end of second switch with the current output part of interface is confirmed in first output connection is connected, the second end of second switch with the first end of second resistance is connected, the second end of second resistance with the current input part of output ground wire interface is connected, the first end of third resistance with the current output part of interface is confirmed in second output connection is connected, the second end of third resistance with the current input part of output ground wire interface is connected.

In addition, in order to achieve the above object, the present invention further provides a range-extended charging method, wherein the range-extended charging system includes a vehicle controller, a charging control circuit and a range extender;

the extended range charging method comprises the following steps:

the vehicle control unit acquires the connection state of a fault vehicle and generates a charging control signal according to the connection state;

the charging control circuit disconnects the self-charging switch according to the charging control signal and closes the rescue charging switch;

when the rescue charging switch is closed, the vehicle control unit acquires the real-time battery capacity of the fault vehicle and generates a constant-current charging signal according to the real-time battery capacity;

and the range extender generates corresponding charging current according to the constant current charging signal so that a charging interface of the fault vehicle receives the charging current to realize range-extending charging of the fault vehicle.

Optionally, when the rescue charging switch is closed, the vehicle control unit obtains a real-time battery capacity of the faulty vehicle, and generates a constant-current charging signal according to the real-time battery capacity, including:

when the rescue charging switch is closed, the vehicle control unit acquires the real-time battery capacity of the fault vehicle;

and judging a charging stage corresponding to the real-time battery capacity, and generating a constant-current charging signal according to the charging stage, wherein the charging stage comprises a pre-charging stage, a constant-current quick-charging stage and a step-by-step current reduction stage.

The invention relates to a range extending charging system, which comprises a vehicle control unit, a charging control circuit and a range extender, wherein the control end of the vehicle control unit is respectively connected with the control end of the charging control circuit and the control end of the range extender, the current output end of the range extender is connected with the current input end of the charging control circuit, the current output end of the charging control circuit is connected with the current input end of a fault vehicle, the vehicle control unit acquires the connection state of the fault vehicle and generates a charging control signal according to the connection state, the charging control circuit disconnects an automatic charging switch according to the charging control signal and closes a rescue charging switch, the vehicle control unit acquires the real-time battery capacity of the fault vehicle when the rescue charging switch is closed, generates a constant-current charging signal according to the real-time battery capacity, the range extender generates corresponding charging current according to the constant-current charging signal and outputs the charging current to the charging interface of the fault vehicle, the invention realizes the extended-range charging of the fault vehicle, the switch in the charging control circuit is controlled to be closed by the vehicle control unit to enable the charging circuit from the range extender to the fault vehicle to be conducted, the range extender generates a constant-current charging signal according to the real-time battery capacity to charge the fault vehicle, a large-capacity battery is not required to be configured, and the charging safety is improved.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of an extended range charging system according to the present invention;

fig. 2 is a schematic structural diagram of a whole vehicle external power supply according to a second embodiment of the extended range charging system of the present invention;

fig. 3 is a schematic structural diagram of a V2V dc cable according to a second embodiment of the extended range charging system of the present invention;

FIG. 4 is a schematic flow chart illustrating a first embodiment of a range-extended charging method according to the present invention;

FIG. 5 is a graph of an optimal current charging curve according to an embodiment of the extended-range charging method of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				A	Rescue vehicle	B	Breakdown vehicle
1	Vehicle control unit	11	V2V DC cable
				2	Charging control circuit	12	Main positive relay of rescue vehicle
3	Range extender	13	Main and negative relay of rescue vehicle
				4	Quick-charging contactor	14	Pre-charging controller
5	Quick charging interface for rescue vehicle	15	Power battery of rescue vehicle
				6	Quick charging interface for fault vehicle	16	Humidity sensitive sensor
7	Fuse of range extender	17	Pre-charging resistor
				8	Fast-charging fuse	18	Power battery for fault vehicle
9	Storage battery	19	Main positive relay for fault vehicle
				10	DC converter	20	Fault vehicle main and negative relay
S1～S2	First to second switches	R1～R3	First to third resistors
				a	First charging gun	b	Second charging gun
c	Control box on cable

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of an extended range charging system according to the present invention.

As shown in fig. 1, the extended-range charging system includes a vehicle control unit 1, a charging control circuit 2 and a range extender 3, a control end of the vehicle control unit 1 is connected to a control end of the charging control circuit 2 and a control end of the range extender 3, a current output end of the range extender 3 is connected to a current input end of the charging control circuit 2, and a current output end of the charging control circuit 2 is connected to a current input end of a faulty vehicle.

The vehicle control unit 1 is configured to acquire a connection state of the faulty vehicle, generate a charging control signal according to the connection state, and send the charging control signal to the charging control circuit 2.

It should be noted that the range extender 3 may be provided for the self-vehicle, and the range extender 3 may be used to perform staged charging on the power battery of the self-vehicle or the power battery of the faulty vehicle B (faulty vehicle), wherein when the range extender 3 of the self-vehicle charges the faulty vehicle B, the self-vehicle may be used as the rescue vehicle a, and the range-extending charging system may be adapted to the rescue vehicle a on-vehicle, so that the rescue vehicle a is similar to a movable charging pile, and is charged on-vehicle when stopped, without a position limitation condition, and the charging may be more convenient.

It is easy to understand that when the vehicle is connected with the faulty vehicle B, the vehicle control unit 1 can obtain the connection state of the faulty vehicle, the connection state can include state information such as whether the charging gun is correctly connected, whether information interaction can be performed with the faulty vehicle B according to a charging protocol, whether line connection is locked, whether the faulty vehicle B sends a fault indication, and the like, when the vehicle control unit 1 judges that the connection state is normal, it can be known that the faulty vehicle B is charged in a safe state, the vehicle control unit 1 can generate a charging control signal according to the connection state, and the charging control signal includes a control signal for disconnecting the self-charging switch and a control signal for closing the rescue charging switch.

And the charging control circuit 2 is used for disconnecting the self-charging switch according to the charging control signal and closing the rescue charging switch.

It can be understood that the charging control circuit 2 can include a rescue charging switch arranged on a rescue charging line of the range extender 3 connected with the faulty vehicle, and a self-charging switch arranged on a self-charging line of the range extender 3 connected with the power battery of the self-vehicle, wherein the rescue charging switch can be used for controlling the connection and disconnection of the rescue charging line, and the self-charging switch can be used for controlling the connection and disconnection of the self-charging line. The charging control circuit 2 can respectively control the self-charging switch to be switched off and the rescue charging switch to be switched on according to the charging control signal, so that the range extender 3 can not charge the power battery of the vehicle per se and can charge the failed vehicle B.

The vehicle control unit 1 is configured to acquire a real-time battery capacity of the faulty vehicle when the rescue charging switch is closed, generate a constant current charging signal according to the real-time battery capacity, and send the constant current charging signal to the range extender 3.

It is easy to understand that the vehicle control unit 1 can obtain the real-time battery capacity of the faulty vehicle when the rescue charging circuit is turned on, that is, the rescue charging switch is turned off, the vehicle control unit 1 searches in the stored constant current charging table according to the real-time battery capacity to obtain the charging current value corresponding to the real-time battery capacity, so that the range extender 3 charges according to the searched charging current value, that is, the constant current charging signal, and the constant current charging table can be a table of data sets such as the optimal charging current, the control torque and the like obtained according to the analysis of the historical battery capacity.

The range extender 3 is configured to generate a corresponding charging current according to the constant current charging signal, and output the charging current to the charging control circuit 2, so that the charging control circuit 2 outputs the charging current to a charging interface of the faulty vehicle, thereby implementing range-extended charging of the faulty vehicle.

It should be understood that the range extender 3 can maintain the charging current value to perform constant current charging according to the charging current value obtained from the vehicle control unit 1, and the range extender 3 is used for charging the fault vehicle, so that the range extender is used for realizing range-extended charging, a large-capacity battery is not required to be configured, and the charging safety is improved.

The extended range charging system of the embodiment comprises a vehicle control unit 1, a charging control circuit 2 and a range extender 3, wherein a control end of the vehicle control unit 1 is respectively connected with a control end of the charging control circuit 2 and a control end of the range extender 3, a current output end of the range extender 3 is connected with a current input end of the charging control circuit 2, a current output end of the charging control circuit 2 is connected with a current input end of a fault vehicle, the vehicle control unit 1 acquires a connection state of the fault vehicle and generates a charging control signal according to the connection state, the charging control circuit 2 disconnects a self-charging switch according to the charging control signal and closes a rescue charging switch, the vehicle control unit 1 acquires a real-time battery capacity of the fault vehicle when the rescue charging switch is closed, generates a constant-current charging signal according to the real-time battery capacity, the range extender 3 generates a corresponding charging current according to the constant-current charging signal and outputs the charging current to a charging interface of the fault vehicle, the range extending charging of the fault vehicle is realized, the vehicle control unit 1 controls the switch in the charging control circuit 2 to be closed to enable the charging circuit from the range extending device 3 to the fault vehicle to be conducted, the range extending device 3 generates a constant-current charging signal according to the real-time battery capacity to charge the fault vehicle, a large-capacity battery is not required to be configured, and the charging safety is improved.

Referring to fig. 2, fig. 2 is a schematic structural diagram of the whole vehicle external power supply according to the second embodiment of the extended range type charging system of the present invention, in this embodiment, the charging control circuit 2 includes a range extender fuse 7, a fast charging contactor 4, a fast charging fuse 8, and a fast charging interface 5, a constant current output end of the range extender 3 is connected to a first end of the fast charging contactor 4, a second end of the fast charging contactor 4 is connected to a current input end of the fast charging interface 5, and a current output end of the fast charging interface 5 is connected to a fast charging interface 6 of the faulty vehicle.

The quick charging contactor 4 is used for closing a rescue charging switch according to the charging control signal;

the quick charging contactor 4 is further used for outputting the charging current generated by the range extender 3 to the quick charging interface when the rescue charging switch is closed;

It should be understood that the rescue charging switch may be a switch of the quick charging contactor 4, and the quick charging contactor 4 is used for controlling the closing of the contactor switch according to a control signal for closing the rescue charging switch so as to conduct the rescue charging line of the range extender 3 connected with the fault vehicle.

The charging control circuit 2 further comprises a range extender fuse 7 and a quick charging fuse 8;

the constant current output end of the range extender 3 is connected with the first end of the range extender fuse 7, the second end of the range extender fuse 7 is connected with the first end of the quick-charging contactor 4, the second end of the quick-charging contactor 4 is connected with the first end of the quick-charging fuse 8, and the second end of the quick-charging fuse 8 is connected with the current input end of the quick-charging interface.

It should be understood that the range extender fuse 7 is used for fusing when the charging current output by the range extender 3 exceeds a safe range, so as to protect the use safety of subsequent equipment and improve the safety of the range extender charging system. The quick-charging fuse 8 is used for fusing when the charging current of the second end of the quick-charging contactor 4 exceeds a safety range, so that the use safety of subsequent equipment is protected, and the safety of the extended-range charging system is further improved.

In this embodiment, the extended-range charging system further includes a storage battery 9 and a dc converter 10, wherein an anode of the storage battery 9 is connected to an anode of the dc converter 10, a cathode of the dc converter 10 is connected to a cathode of the storage battery 9, and a current output end of the dc converter 10 is connected to a current input end of the charging control circuit 2;

the storage battery 9 is used for outputting the current of the storage battery 9 to the direct current converter 10 when the rescue charging switch is closed and the range extender 3 is not started;

the direct current converter 10 is configured to convert the current of the storage battery 9 into a direct current charging current, and output the direct current charging current to the charging control circuit 2, so that the charging control circuit 2 outputs the direct current charging current to a charging interface of the fault vehicle.

It is easy to understand that the storage battery 9 and the dc converter 10 can charge the faulty vehicle B when the rescue charging switch is closed and the range extender 3 is not started, and since the power battery 18 of the faulty vehicle may be low in power and cannot maintain the vehicle controller 1 (not shown in the figure) of the faulty vehicle to control the switch of the main positive relay 19 of the faulty vehicle and the switch of the main negative relay 20 of the faulty vehicle to be closed, the charging voltage cannot be output from the fast charging interface 6 of the faulty vehicle to the power battery 18 of the faulty vehicle, so that the storage battery 9 and the dc converter 10 can charge the vehicle controller of the faulty vehicle B first to control the switch of the main positive relay 19 of the faulty vehicle and the switch of the main negative relay 20 of the faulty vehicle to be closed.

In this embodiment, the extended range charging system further includes a V2V dc cable 11, a current output end of the charging control circuit 2 is connected to a first charging end of the V2V dc discharging cable, a second charging end of the V2V dc cable 11 is connected to a fast charging interface of the faulty vehicle, and a signal output end of the V2V dc cable 11 is wirelessly connected to a signal input end of the vehicle control unit 1;

the V2V direct-current discharging cable is used for detecting the connection state of the fault vehicle and sending the connection state to the vehicle control unit 1, so that the vehicle control unit 1 generates a charging control signal according to the connection state;

the V2V direct-current discharging cable is further used for acquiring the real-time battery capacity of the fault vehicle through a charging communication protocol, and sending the real-time battery capacity to the vehicle control unit 1, so that the vehicle control unit 1 generates a constant-current charging signal according to the real-time battery capacity;

the V2V direct current discharging cable is further used for outputting the charging current generated by the range extender 3 to a charging interface of the fault vehicle.

It is easy to understand that the V2V dc cable 11 may be a connection cable between the dedicated and extended-range charging system and the faulty vehicle B, and the V2V dc cable 11 may have functions of information interaction, transmission of charging capacity and charging voltage, connection locking, connection status detection, and fault indication. The connection locking function can be a locking function for preventing the connection cable from slipping when the rescue vehicle quick charging interface 5 and the fault vehicle quick charging interface 6 are normally connected, and the fault indication function can be an alarm function when the rescue vehicle quick charging interface 5 and the fault vehicle quick charging interface 6 are abnormally connected.

It is easy to understand that the charge control circuit 2 can include a rescue vehicle main positive relay 12, a rescue vehicle main negative relay 13, a pre-charge controller 14, and accordingly, the self-charge switches can be a switch of the rescue vehicle main positive relay 12, a switch of the rescue vehicle main negative relay 13, a switch of the pre-charge controller 14. The range-extending charging system can further comprise a humidity-sensitive sensor 16 and a pre-charging resistor 17, the positive electrode of a power battery 15 of the rescue vehicle is connected with the first end of the humidity-sensitive sensor 16, the second end of the humidity-sensitive sensor 16 is respectively connected with the first end of a main positive relay 12 of the rescue vehicle and the first end of the pre-charging resistor 17, the second end of the pre-charging resistor 17 is connected with the first end of a pre-charging controller 14, the second end of the main positive relay 12 of the rescue vehicle and the second end of the pre-charging controller 14 are respectively connected with the constant-current output end of the range extender 3, the negative electrode of the power battery 15 of the rescue vehicle is connected with the first end of a main negative relay 13 of the rescue vehicle, and the second end of the main negative relay 13 of the rescue vehicle is connected with the constant-current output end of the range extender 3. The humidity-sensitive sensor 16 is used for detecting the humidity of the power battery 15 of the rescue vehicle, and the pre-charging resistor 17 is used for carrying out load protection on pre-charging flow, so that the safety of the extended-range charging system is improved.

Further, referring to fig. 3, the V2V dc cable 11 includes a first charging gun a, a second charging gun b, and an on-cable control box c, a current input end of the first charging gun a is connected to a current output end of the charging control circuit 2, a current output end of the first charging gun a is connected to a current input end of the on-cable control box c, a current output end of the on-cable control box c is connected to a current input end of the second charging gun b, a current output end of the second charging gun b is connected to a current input end of the second charging gun b, and a signal output end of the on-cable control box c is wirelessly connected to a signal input end of the vehicle controller 1;

the on-cable control box c is used for detecting the connection state of the fault vehicle and sending the connection state to the vehicle control unit 1, so that the vehicle control unit 1 generates a charging control signal according to the connection state;

the on-cable control box c is further configured to acquire a real-time battery capacity of the faulty vehicle through a charging communication protocol, and send the real-time battery capacity to the vehicle control unit 1, so that the vehicle control unit 1 generates a constant-current charging signal according to the real-time battery capacity;

the first charging gun a is used for outputting the charging current generated by the range extender 3 to the on-cable control box c, so that the on-cable control box c outputs the charging current to the second charging gun b; and the second charging gun b is used for outputting the charging current to a charging interface of the fault vehicle.

It is easy to understand that the first charging gun a can only be connected to the rescue vehicle quick charging interface 5, and the interface of the first charging gun a corresponds to the rescue vehicle quick charging interface 5 one to one. The second charging gun b can only be connected to the failed vehicle quick charging interface 6, and the interface of the second charging gun b corresponds to the failed vehicle quick charging interface 6 one to one. The on-cable control box c can have the functions of information interaction, charging electric quantity and charging voltage transmission, connection locking, connection state detection, fault indication and the like, is in wireless connection with the vehicle control unit 1 of the vehicle, and is used for sending fault vehicle B information of the vehicle control unit 1 of the fault vehicle B to the vehicle control unit 1 of the vehicle in real time through a charging communication protocol, wherein the fault vehicle B information can comprise information such as current, voltage, required power and battery capacity of a power battery 18 of the fault vehicle.

Further, the first charging gun a includes a high-voltage positive input interface, a high-voltage negative input interface, a direct-current positive input interface, a direct-current negative input interface, a first input end connection confirmation interface, a second input end connection confirmation interface, a CAN bus high-voltage input interface, a CAN bus low-voltage input interface, an input end ground wire interface, an input end locking module, a first resistor R1, and a first switch S1.

It is easy to understand that, as shown in fig. 3, HV + _ QC1 represents a high-voltage positive input interface, HV- _ QC1 represents a high-voltage negative input interface, a1+ represents a direct-current positive input interface, a 1-represents a direct-current negative input interface, CC1 represents a first input terminal connection confirmation interface, CC2 represents a second input terminal connection confirmation interface, CAN _ H1 represents a CAN bus high-voltage input interface, CAN _ L1 represents a CAN bus low-voltage input interface, PE1 represents an input terminal ground interface, and SZ1 represents an input terminal locking module.

The current input end of the high-voltage positive input interface, the current input end of the high-voltage negative input interface, the current input end of the direct-current positive input interface, the current input end of the direct-current negative input interface, the current input end of the first input end connected with the confirmation interface, the current input end of the second input end connected with the confirmation interface, the current input end of the CAN bus high-voltage input interface and the current input end of the CAN bus low-voltage input interface are respectively connected with the current output end of the charging control circuit 2;

the current output end of the high-voltage positive input interface, the current output end of the high-voltage negative input interface, the current output end of the direct-current positive input interface, the current output end of the direct-current negative input interface, the current output end of the first input end connected with the confirmation interface, the current output end of the second input end connected with the confirmation interface, the current output end of the CAN bus high-voltage input interface and the current output end of the CAN bus low-voltage input interface are respectively connected with the current input end of the input end ground wire interface and the current input end of the on-cable control box c, and the current output end of the input end ground wire interface is connected with the grounding end of the charging control circuit 2;

the signal input end of the input end locking module is wirelessly connected with the signal output end of the on-cable control box c, the first end of the first switch S1 is connected with the current output end of the first input end connection confirmation interface, the second end of the first switch S1 is connected with the first end of the first resistor R1, and the second end of the first resistor R1 is connected with the current input end of the input end ground wire interface.

It is easy to understand that when the first charging gun a is connected with a certain quick charging interface, the cable-mounted control box c can control the first switch S1 to be closed, whether the first charging gun a is connected with the quick charging interface of the rescue vehicle a (self) is judged by detecting the load current of the first resistor R1, and if the connection is detected to be abnormal, an alarm is triggered, so that the connection errors at two ends of the V2V direct current cable 11 are prevented, and the charging of the faulty vehicle B is failed.

Further, the second charging gun b comprises a high-voltage positive output interface, a high-voltage negative output interface, a direct-current positive output interface, a direct-current negative output interface, a first output end connection confirmation interface, a second output end connection confirmation interface, a CAN bus high-voltage output interface, a CAN bus low-voltage output interface, an output end ground wire interface, an output end locking module, a second resistor R2, a third resistor R3 and a second switch S2.

It is easy to understand that, as shown in fig. 3, HV + _ QC2 represents a high-voltage positive output interface, HV- _ QC2 represents a high-voltage negative output interface, a2+ represents a direct-current positive output interface, a 2-represents a direct-current negative output interface, CC3 represents a first output terminal connection confirmation interface, CC4 represents a second output terminal connection confirmation interface, CAN _ H2 represents a CAN bus high-voltage output interface, CAN _ L2 represents a CAN bus low-voltage output interface, PE2 represents an output terminal ground interface, and SZ2 represents an output terminal locking module.

The current input end of the high-voltage positive output interface, the current input end of the high-voltage negative output interface, the current input end of the direct-current positive output interface, the current input end of the direct-current negative output interface, the current input end of the CAN bus high-voltage output interface, the current input end of the CAN bus low-voltage output interface and the current input end of the output end ground wire interface are respectively connected with the current output end of the on-cable control box c; the current output end of the high-voltage positive output interface, the current output end of the high-voltage negative output interface, the current output end of the direct-current positive output interface, the current output end of the direct-current negative output interface, the current output end of the CAN bus high-voltage output interface, the current output end of the CAN bus low-voltage output interface and the current output end of the output end ground wire interface are respectively connected with the quick charging interface of the fault vehicle;

the signal input part of output locking module with on-cable control box c' S signal output part wireless connection, the first end of second switch S2 with the current output part that the interface was confirmed in first output connection is connected, the second end of second switch S2 with the first end of second resistance R2 is connected, the second end of second resistance R2 with the current input part of output ground wire interface is connected, the first end of third resistance R3 with the current output part that the interface was confirmed in second output connection is connected, the second end of third resistance R3 with the current input part of output ground wire interface is connected.

It is easy to understand that when the second charging gun B is connected with a certain quick charging interface, the on-cable control box c can control the second switch S2 to be closed, and determine whether the second charging gun B is connected with the quick charging interface 6 of the faulty vehicle by detecting the load current of the second resistor R2 and the third resistor R3, and trigger an alarm if the connection is detected to be abnormal, so as to prevent the connection error at the two ends of the V2V dc cable 11, and make the charging of the faulty vehicle B fail.

This embodiment is through setting up the break-make condition of charging the circuit fast by charging contactor 4 and charging interface 5 control soon, increase journey ware fuse 7 and fill fuse 8 soon and be used for realizing overvoltage overcurrent protection, battery 9 and direct current converter 10 charge to trouble vehicle B before increasing journey ware 3 starts, guarantee that the interior charging line of trouble vehicle B switches on, set up special V2V direct current cable 11, it realizes stable power transmission and information interaction to charge rifle and on the cable through both ends, power grid voltage is unstable and influence the battery life-span has been avoided, further improve the charging security.

An embodiment of the invention provides a range-extended charging method, and referring to fig. 4, fig. 4 is a schematic flow chart of a first embodiment of the range-extended charging method of the invention.

In this embodiment, the extended-range charging system includes a vehicle controller, a charging control circuit, and an extended-range device, and the extended-range charging method includes the following steps:

step S10: the vehicle control unit acquires the connection state of the fault vehicle and generates a charging control signal according to the connection state.

It should be noted that, the range extender may be provided on the vehicle itself, and the range extender may be used to perform staged charging on the power battery of the vehicle itself or the power battery of a faulty vehicle (faulty vehicle), wherein, when the range extender of the vehicle itself charges the faulty vehicle, the vehicle itself may be used as a rescue vehicle, and the range extender charging system may be adapted to the rescue vehicle on the vehicle, so that the rescue vehicle is similar to a movable charging pile, and is charged on the stop without position limitation, and the charging is more convenient.

It is easy to understand that when the vehicle is connected with the fault vehicle, the vehicle control unit can acquire the connection state of the fault vehicle, the connection state can include state information such as whether the charging gun is correctly connected, whether information interaction can be performed with the fault vehicle according to a charging protocol, whether line connection is locked, whether the fault vehicle sends a fault indication, and the like, when the vehicle control unit judges that the connection state is normal, the vehicle control unit can know that the fault vehicle is charged in a safe state, the vehicle control unit can generate a charging control signal according to the connection state, and the charging control signal comprises a control signal for disconnecting the self-charging switch and a control signal for closing the rescue charging switch.

Step S20: and the charging control circuit disconnects the self-charging switch according to the charging control signal and closes the rescue charging switch.

It can be understood that the charging control circuit can comprise a rescue charging switch arranged on a rescue charging line of the range extender connected with the fault car and a self-charging switch arranged on a self-charging line of the range extender connected with the power battery of the self-vehicle, wherein the rescue charging switch can be used for controlling the connection and disconnection of the rescue charging line, and the self-charging switch can be used for controlling the connection and disconnection of the self-charging line. The charging control circuit can respectively control the self-charging switch to be switched off and the rescue charging switch to be switched on according to the charging control signal, so that the range extender does not charge the power battery of the vehicle per se and charges the fault vehicle.

Step S30: and when the rescue charging switch is closed, the vehicle control unit acquires the real-time battery capacity of the fault vehicle and generates a constant-current charging signal according to the real-time battery capacity.

It is easy to understand that the vehicle control unit can obtain the real-time battery capacity of the fault vehicle when the rescue charging circuit is switched on, that is, when the rescue charging switch is switched off, the vehicle control unit searches in a stored constant current charging table according to the real-time battery capacity to obtain a charging current value corresponding to the real-time battery capacity, so that the range extender charges according to the searched charging current value, that is, a constant current charging signal, and the constant current charging table can be a table of data sets such as an optimal charging current, an optimal charging current and a control torque obtained according to historical battery capacity analysis.

Step S40: and the range extender generates corresponding charging current according to the constant current charging signal so that a charging interface of the fault vehicle receives the charging current to realize range-extending charging of the fault vehicle.

It should be understood that the range extender can maintain the charging current value to perform constant current charging according to the charging current value obtained from the vehicle controller, and the range extender is adopted to charge the fault vehicle, so that the range extender is used for realizing range extension charging, a large-capacity battery is not required to be configured, and the charging safety is improved.

Further, step S30 in this embodiment further includes: when the rescue charging switch is closed, the vehicle control unit acquires the real-time battery capacity of the fault vehicle; and judging a charging stage corresponding to the real-time battery capacity, and generating a constant-current charging signal according to the charging stage, wherein the charging stage comprises a pre-charging stage, a constant-current quick-charging stage and a step-by-step current reduction stage.

It is easy to understand that, as shown in fig. 5, the abscissa is the battery capacitance, the ordinate is the current, the vehicle controller obtains the real-time battery capacity, when the real-time battery capacity is smaller than the first battery capacity C1, the vehicle controller determines as the pre-charging phase, the pre-charging phase is usually the low-power constant power generation of the range extender, so as to output the stable low current for charging the faulty vehicle, and enhance the protection of the battery, and generally, the faulty vehicle needs to be rescued and charged usually in a state with low battery capacity, so the constant charging according to the charging phase also starts charging from the pre-charging phase. After a first time period passes in the pre-charging stage, the vehicle control unit can obtain the battery capacity of the fault vehicle again, and the duration of the first time period can be set according to the optimal pre-charging time in the historical test. If the battery capacity is pre-charged to be larger than or equal to the second battery capacity C2 and smaller than the third battery capacity C3, the whole vehicle controller determines that the vehicle controller can be in a constant-current quick-charging stage, the constant-current quick-charging stage is usually high-power constant power generation of a range extender, the constant current is used for quickly providing current for the battery in a short time, and damage of unstable current to the battery is reduced.

It can be understood that the vehicle controller can obtain the battery capacity of the faulty vehicle again after the constant-current quick-charging stage passes through the second time period, and the duration of the second time period can be set according to the optimal high-power quick-charging time in the historical test. If the battery capacity is increased to be larger than or equal to the third battery capacity C3 and smaller than the fourth battery capacity C4 through pre-charging, the vehicle control unit determines that the vehicle control unit can be a step-by-step current reduction stage, the step-by-step current reduction stage is usually carried out in a state that the battery is to be fully charged, and in the process of fully charging the battery, the battery is continuously charged by adopting a method of reducing the current step by using the constant battery monomer voltage, so that the battery damage caused by over-charging of the battery is avoided. Because the stage of descending the class step by step is for making the battery hold the full stage, consequently, when trouble vehicle user in the quick charging stage charging process of constant current or after, all can initiatively withdraw from and charge, can select to move near when the electric quantity enough reaches near charging pile and fill electric pile for increase form charging system selectivity is stronger, improves user experience.

It should be understood that the range extender realizes constant current power generation, and torque and rotating speed need to be ensured to change along with voltage, so that the power generation control of the range extender adopts a current closed-loop control method, and a table of data sets such as optimal charging current, control torque and the like is searched by acquiring data such as voltage and current of a fault vehicle battery in real time, so that the torque of the range extender is controlled, and the rotating speed of the range extender is output along with the voltage, so that stable constant current output is realized.

According to the embodiment, the connection state of a fault vehicle is acquired through the vehicle control unit, a charging control signal is generated according to the connection state, the charging control circuit is disconnected from the self-charging switch according to the charging control signal, the rescue charging switch is closed, the vehicle control unit acquires the real-time battery capacity of the fault vehicle when the rescue charging switch is closed, a constant-current charging signal is generated according to the real-time battery capacity, the range extender generates corresponding charging current according to the constant-current charging signal, the charging current is output to a charging interface of the fault vehicle, the range extension charging of the fault vehicle is achieved, the vehicle control unit controls the switch in the charging control circuit to be closed to enable a charging circuit from the range extender to the fault vehicle to be conducted, the range extender generates the constant-current charging signal according to the real-time battery capacity to charge the fault vehicle, a large-capacity battery does not need to be configured, and the charging safety is improved.

It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.

It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.

In addition, the technical details not described in detail in this embodiment can be referred to the extended range charging system and method provided in any embodiment of the present invention, and are not described herein again.

Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The extended-range charging system is characterized by comprising a vehicle control unit, a charging control circuit and an extended-range device, wherein the control end of the vehicle control unit is respectively connected with the control end of the charging control circuit and the control end of the extended-range device, the current output end of the extended-range device is connected with the current input end of the charging control circuit, and the current output end of the charging control circuit is connected with the current input end of a fault vehicle;

2. The extended range charging system according to claim 1, wherein the charging control circuit comprises a fast charging contactor and a fast charging interface, a constant current output end of the extended range device is connected with a first end of the fast charging contactor, a second end of the fast charging contactor is connected with a current input end of the fast charging interface, and a current output end of the fast charging interface is connected with the fast charging interface of the fault vehicle;

3. The extended range charging system of claim 2, wherein the charging control circuit further comprises a range extender fuse and a quick charge fuse;

4. The extended-range charging system according to claim 1, further comprising a battery and a dc converter, wherein an anode of the battery is connected to an anode of the dc converter, a cathode of the dc converter is connected to a cathode of the battery, and a current output terminal of the dc converter is connected to a current input terminal of the charge control circuit;

5. The extended-range charging system according to any one of claims 1 to 4, further comprising a V2V DC cable, wherein a current output end of the charging control circuit is connected to a first charging end of the V2V DC discharging cable, a second charging end of the V2V DC cable is connected to a fast charging interface of the fault vehicle, and a signal output end of the V2V DC cable is wirelessly connected to a signal input end of the vehicle control unit;

6. The extended-range charging system according to claim 5, wherein the V2V DC cable comprises a first charging gun, a second charging gun and an on-cable control box, the current input terminal of the first charging gun is connected with the current output terminal of the charging control circuit, the current output terminal of the first charging gun is connected with the current input terminal of the on-cable control box, the current output terminal of the on-cable control box is connected with the current input terminal of the second charging gun, the current output terminal of the second charging gun is connected with the current input terminal of the second charging gun, and the signal output terminal of the on-cable control box is wirelessly connected with the signal input terminal of the vehicle controller;

7. The extended-range charging system according to claim 6, wherein the first charging gun comprises a high-voltage positive input interface, a high-voltage negative input interface, a direct-current positive input interface, a direct-current negative input interface, a first input end connection confirmation interface, a second input end connection confirmation interface, a CAN bus high-voltage input interface, a CAN bus low-voltage input interface, an input end ground wire interface, an input end locking module, a first resistor and a first switch;

8. The extended-range charging system according to claim 6, wherein the second charging gun comprises a high-voltage positive output interface, a high-voltage negative output interface, a direct-current positive output interface, a direct-current negative output interface, a first output terminal connection confirmation interface, a second output terminal connection confirmation interface, a CAN bus high-voltage output interface, a CAN bus low-voltage output interface, an output terminal ground wire interface, an output terminal locking module, a second resistor, a third resistor and a second switch;

9. The extended-range charging method is characterized in that the extended-range charging system comprises a vehicle control unit, a charging control circuit and an extended-range device;

the extended range charging method comprises the following steps:

10. The extended-range charging method according to claim 9, wherein the vehicle control unit obtains a real-time battery capacity of the faulty vehicle when the rescue charging switch is closed, and generates a constant-current charging signal according to the real-time battery capacity, and the method includes: