CN116101099A

CN116101099A - Vehicle-to-vehicle charging method and device and vehicle charging system

Info

Publication number: CN116101099A
Application number: CN202310406462.2A
Authority: CN
Inventors: 矫红哲; 温作腾; 邱冬; 林阳辉
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-05-12
Anticipated expiration: 2043-04-17
Also published as: CN116101099B

Abstract

The application discloses a vehicle-to-vehicle charging method, device and vehicle charging system. The vehicle-to-vehicle charging method comprises the following steps: the power supply vehicle sends a closing signal to the power receiver vehicle through a low-voltage cable of the direct-current charging harness; the charge loop of the trolley bus is closed according to the closing signal, and a feedback signal indicating the closing of the charge loop of the trolley bus is fed back to the power supply vehicle through the low-voltage cable; the power supply car closes a charging loop of the power supply car to output a supply current to power the power receiver car through a high-voltage cable of the direct-current charging harness in response to receiving a feedback signal indicating that the charging loop of the power receiver car is closed from the power receiver car through the low-voltage cable. The vehicle-to-vehicle charging method improves universality and flexibility of vehicle-to-vehicle charging.

Description

Vehicle-to-vehicle charging method and device and vehicle charging system

Technical Field

The application relates to the technical field of batteries, in particular to a vehicle-to-vehicle charging method and device and a vehicle charging system.

Background

With the development of new energy technology, more and more engineering vehicles adopt new energy automobiles. Because different engineering vehicles use different working conditions, partial vehicle electricity consumption is large, but the use place is limited to cause charging difficulty, partial vehicle electricity consumption is small, the battery is easy to supplement electricity, and the battery utilization efficiency is low, so that the utilization efficiency of the battery is improved, and the power supply trolley with small consumption is utilized to charge the power receiving trolley with large consumption in a trolley-to-trolley charging mode.

In the related art, a vehicle-to-vehicle charging mode is to connect a power supply vehicle and a power receiving vehicle to a charger, and charge and discharge between vehicles are controlled by the charger. However, this charging method needs to rely on the access of the charger, and the hardware cost is high. And the charger is usually fixed, and the power supply vehicle and the electric car need to be moved to the position where the charger is positioned to charge the vehicle, so that the universality and the flexibility of charging the vehicle are poor.

Disclosure of Invention

In view of the above problems, the application provides a vehicle-to-vehicle charging method, a vehicle-to-vehicle charging device and a vehicle charging system, which can reduce hardware cost required by vehicle-to-vehicle charging and improve universality and flexibility of vehicle-to-vehicle charging.

In a first aspect, an embodiment of the present application provides a vehicle-to-vehicle charging method, applied to a power supply vehicle, including: transmitting a closing signal to a trolley bus through a low-voltage cable of a direct-current charging harness, so that the trolley bus closes a charging loop of the trolley bus according to the closing signal; in response to receiving a feedback signal from the electric power receiving vehicle via the low voltage cable indicating that the charging loop of the electric power receiving vehicle is closed, the charging loop of the electric power supplying vehicle is closed to output a supply current to supply power to the electric power receiving vehicle via the high voltage cable of the direct current charging harness.

In the technical scheme of this embodiment, come by the low-voltage cable of power supply car through direct current pencil that charges to the tram send closed signal, make the charging circuit of tram according to this closed signal closure tram to send the closed feedback signal of charging circuit that instructs the tram to the power supply car through low-voltage cable, make the charging circuit of closed power supply car of power supply car, with the high-voltage cable through direct current pencil that charges to the tram power supply by the power supply car. Therefore, the power supply vehicle and the electric vehicle automatically perform signal transmission and charge and discharge control through the direct current charging wire harness, a charger is not required to be arranged, the hardware cost required by vehicle-to-vehicle charging is reduced, and the universality and the flexibility of vehicle-to-vehicle charging are improved.

In some embodiments, the low voltage cable through the dc charging harness sends a closing signal to the trolley bus, comprising: acquiring the current state of the power supply vehicle in response to receiving an energy supplementing signal sent by the power supply vehicle through the low-voltage cable; transmitting a closing signal to a trolley bus through the low voltage cable when the current state is an energizable state; wherein the energizable state includes at least one of a stationary state and a low power consumption state. Under the condition that the energy supplementing signal sent by the electric car is received, the current state of the electric car is detected, and when the current state of the electric car is determined to be the energy supplying state, the electric car sends a closing signal to the electric car, so that the follow-up battery for supplying power to the electric car is a battery with low utilization rate, the condition of overload of the battery is reduced, and the safety and the charging efficiency of charging the electric car are improved.

In some embodiments, the energy replenishment signal comprises battery pack information of the electric vehicle; the sending of the closing signal to the trolley bus through the low voltage cable comprises: and when the battery pack information of the electric power receiving vehicle is not abnormal, sending a closing signal to the electric power receiving vehicle through the low-voltage cable. The battery pack information of the power supply vehicle is detected in the power supply vehicle to send a closing signal to the power supply vehicle through the low-voltage cable under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, so that the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

In some embodiments, the closure signal includes battery pack information for the power supply vehicle; the charging circuit of the electric power receiving vehicle is closed by the electric power receiving vehicle under the condition that the battery pack information of the electric power supplying vehicle is determined to be abnormal. The battery pack information of the power supply vehicle in the closed signal is detected through the power supply vehicle, so that the charging loop of the power supply vehicle is closed again under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

In some embodiments, the power supply current is determined according to the current battery state of the power supply vehicle, so that the power supply current output by the power supply vehicle accords with the current power supply capacity of the power supply vehicle, output protection of the power supply vehicle is realized, and the safety of the power supply process of the power supply vehicle is improved.

In some embodiments, further comprising: disconnecting a charging loop of the power supply vehicle under the condition that the current battery state of the power supply vehicle meets a preset condition; the preset condition comprises at least one of that the battery temperature of the power supply vehicle is larger than a preset temperature threshold value and the battery electric quantity of the power supply vehicle is smaller than a preset electric quantity threshold value. When the current battery state of the power supply vehicle meets the preset condition that the current battery temperature is greater than a preset temperature threshold value or the battery electric quantity of the power supply vehicle is smaller than a preset electric quantity threshold value, a charging loop of the power supply vehicle is disconnected, so that potential safety hazards of charging caused by overlarge high temperature or battery loss are avoided, and the safety of the power supply process of the power supply vehicle is improved.

In a second aspect, an embodiment of the present application provides a vehicle-to-vehicle charging method, applied to a trolley bus, including: receiving a closing signal sent by a power supply vehicle through a low-voltage cable of a direct-current charging harness; and closing the charging loop of the electric power car according to the closing signal, and feeding back a feedback signal indicating the closing of the charging loop of the electric power car to the power supply car through the low-voltage cable so as to receive the power supply current of the electric power car for charging after the power supply car closes the charging loop of the electric power car according to the feedback signal through the high-voltage cable of the direct-current charging wire harness.

In some embodiments, the low voltage cable passing through the dc charging harness receives a closing signal sent by the electric vehicle, and includes: transmitting an energy supplementing signal to the power supply vehicle through the low-voltage cable so as to receive the closing signal fed back by the power supply vehicle according to the energy supplementing signal when the power supply vehicle is in an energy-supplying state through the low-voltage cable; wherein the energizable state includes at least one of a stationary state and a low power consumption state. Under the condition that the energy supplementing signal sent by the electric car is received, the current state of the electric car is detected, and when the current state of the electric car is determined to be the energy supplying state, the electric car sends a closing signal to the electric car, so that the follow-up battery for supplying power to the electric car is a battery with low utilization rate, the condition of overload of the battery is reduced, and the safety and the charging efficiency of charging the electric car are improved.

In some embodiments, the energy replenishment signal comprises battery pack information of the electric vehicle; the closing signal is generated by the power supply vehicle when it is determined that the battery pack information of the power receiving vehicle is not abnormal. The battery pack information of the power supply vehicle is detected in the power supply vehicle to send a closing signal to the power supply vehicle through the low-voltage cable under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, so that the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

In some embodiments, the closure signal includes battery pack information for the power supply vehicle; and closing a charging loop of the trolley bus according to the closing signal, wherein the charging loop comprises: and determining that the battery pack information of the power supply vehicle is not abnormal, and closing a charging loop of the power receiving vehicle. The battery pack information of the power supply vehicle in the closed signal is detected through the power supply vehicle, so that the charging loop of the power supply vehicle is closed again under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

In some embodiments, further comprising: and under the condition that the current state of the power receiving vehicle is an operation state, controlling the load operation of the power receiving vehicle according to the power supply current, so that the utilization rate of the power supply current is improved.

In a third aspect, the present application provides a vehicle-to-vehicle charging device, applied to a power supply vehicle, comprising: the signal sending module is used for sending a closing signal to the electric vehicle through a low-voltage cable of the direct-current charging harness so that the electric vehicle closes a charging loop of the electric vehicle according to the closing signal; and the current output module is used for closing the charging loop of the power supply car to output a supply current through the high-voltage cable of the direct-current charging wire harness to supply power for the power supply car in response to receiving a feedback signal indicating that the charging loop of the power supply car is closed from the power supply car through the low-voltage cable.

In a fourth aspect, the present application provides a vehicle-to-vehicle charging device, applied to a tram, comprising: the signal receiving module is used for receiving a closing signal sent by the power supply vehicle through a low-voltage cable of the direct-current charging wire harness; and the current input module is used for closing the charging loop of the electric power car according to the closing signal, feeding back a feedback signal indicating the closing of the charging loop of the electric power car to the power supply car through the low-voltage cable, and receiving the power supply current of the electric power car for charging after the power supply car closes the charging loop of the electric power car according to the feedback signal through the high-voltage cable of the direct-current charging wire harness.

In a fifth aspect, the present application provides an electronic device comprising a memory storing a computer program and a processor executing the method in an implementation of the first or second aspect when the computer program is executed.

In a sixth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the method in an implementation of the first or second aspect.

In a seventh aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the method in an implementation of the first or second aspect.

In an eighth aspect, the present application provides a vehicle charging system comprising a power supply vehicle and a power receiving vehicle; the power receiving car is connected with the power supply car through a direct-current charging wire harness; the powered vehicle includes the vehicle-to-vehicle charging device of the third aspect, and the electric power receiving vehicle includes the vehicle-to-vehicle charging device of the fourth aspect.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 2 is a topology diagram of a vehicle-to-vehicle charging system according to some embodiments of the present application;

fig. 3 is a topological structure diagram of a dc charging harness male in accordance with some embodiments of the present application;

fig. 4 is a topology diagram of a dc charging receptacle according to some embodiments of the present application;

FIG. 5 is a first flow chart of a vehicle-to-vehicle charging method according to some embodiments of the present application;

FIG. 6 is a second flowchart of a vehicle-to-vehicle charging method according to some embodiments of the present application;

FIG. 7 is a first schematic structural view of a vehicle-to-vehicle charging apparatus according to some embodiments of the present application;

FIG. 8 is a second schematic structural view of a vehicle-to-vehicle charging apparatus according to some embodiments of the present application;

FIG. 9 is a first schematic structural view of an electronic device according to some embodiments of the present application;

fig. 10 is a second schematic structural diagram of an electronic device according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

10-vehicle; 100-battery pack; 200-a controller; 300-motor; 400-a male end of the direct current charging harness; 401-dc charging receptacle; 20-a power supply vehicle; 21-a trolley bus; 22-a direct current charging harness; 501-a signal transmission module; 502-a current output module; 601-a signal receiving module; 602-a current input module; 70-a first electronic device; 701-a first processor; 702-a first memory; 703-a first communication bus; 80-a second electronic device; 801-a second processor; 802-a second memory; 803-second communication bus.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

The current mode of realizing the car to car charges is that the charging machine is connected between the power supply car and the electric car, the charging machine is utilized to control the power supply car and the electric car to charge and discharge, so that the direct current received from the power supply car is converted into alternating current, and then the alternating current is converted into direct current which can be used for charging the electric car to charge the electric car. However, this approach requires access to the charger, which is costly in terms of hardware. And the charging machine is usually fixed, and after the charging machine is connected to the position where the power supply car and the electric vehicle are moved to, the charging machine can be used for charging the car, and meanwhile, the power supply car, the charging machine and the electric vehicle are required to be subjected to three-party adaptation, so that the universality and the flexibility of charging the car are poor.

To above-mentioned technical problem, this embodiment of the application is passed through the low-voltage cable of direct current pencil that charges by the power supply vehicle and is sent the closure signal to the tram, makes the charging circuit of tram according to this closure signal closure tram to send the feedback signal that instructs the charging circuit closure of tram to the power supply vehicle through low-voltage cable, makes the charging circuit of power supply vehicle closure power supply vehicle, in order to pass through the high-voltage cable of direct current pencil to the tram power supply by the power supply vehicle. Therefore, the power supply vehicle and the electric vehicle automatically perform signal transmission and charge and discharge control through the direct current charging wire harness, a charger is not required to be arranged, the hardware cost required by vehicle-to-vehicle charging is reduced, and the universality and the flexibility of vehicle-to-vehicle charging are improved.

The vehicle-to-vehicle charging method and device and the vehicle charging system disclosed by the embodiment of the application can be applied to a vehicle adopting a battery as a power source. Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 10 according to some embodiments of the present application. The vehicle 10 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The interior of the vehicle 10 is provided with a battery pack 100, and the battery pack 100 may be provided at the bottom or at the head or at the tail of the vehicle 10. The battery pack 100 may be used for power supply of the vehicle 10, for example, the battery pack 100 may serve as an operating power source of the vehicle 10. The vehicle 10 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery pack 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 10.

In some embodiments of the present application, the battery pack 100 may be used not only as an operating power source for the vehicle 10, but also as a driving power source for the vehicle 10, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 10.

Here, the battery pack 100 is used as a driving power source of the vehicle 10 as a driving power source provided by the vehicle 10 in the present application.

A vehicle charging system provided according to some embodiments of the present application, as shown in fig. 2, includes a power supply vehicle 20 and a power receiving vehicle 21, the power receiving vehicle 21 and the power supply vehicle 20 being connected by a direct current charging harness 22. The power supply vehicle 20 and the power receiving vehicle 21 may be the vehicle 10 shown in fig. 1. The direct current charging harness 22 is a double-plug cable, and specifically can be a national standard direct current charging high-low voltage harness, two ends of the direct current charging harness 22 are provided with direct current charging harness male heads 400 as shown in fig. 3, and the direct current charging harness male heads 400 at two ends of the direct current charging harness 22 are respectively connected to original national standard direct current charging sockets 401 on the bodies of the electric power supply vehicle 20 and the electric power receiving vehicle 21 so as to realize the plug-in gun connection with the electric power supply vehicle 20 and the electric power receiving vehicle 21 without adding or occupying other vehicle interfaces. The dc charging receptacle 401 may be as shown in fig. 4. The power supply vehicle 20 can be a vehicle with low battery utilization efficiency, such as cement mixer truck, and can transport cement back and forth between a mixing station and a pump truck during construction, the working condition is single, and the power supply vehicle can be the cement mixer truck because the power supply vehicle can easily supplement power after transporting to the mixing station. The electric vehicle 21 can be a vehicle with large electric consumption, for example, a cement pump truck has to use a pump for construction and pouring cement at a site, has large load and is not easy to supplement electric quantity due to environmental limitation, and frequent shutdown and power supplement can influence the construction progress, so the electric vehicle 21 can be a cement pump truck. In this system, the direct current charging harness includes a low voltage cable for transmitting a message signal between the power supply vehicle 20 and the power receiving vehicle 21, and a high voltage cable for transmitting a power supply current output from the power supply vehicle 20.

The controllers 200 of the power supply vehicle 20 and the power receiving vehicle 21 each include at least one of a battery management system (Battery Management System, abbreviated as BMS) and a whole vehicle controller (Vehicle Control Unit, abbreviated as VCU). The controller 200 of the electric power supply vehicle 20 is configured to send a closing signal to the controller 200 of the electric power receiving vehicle 21 via the low-voltage cable of the direct-current charging harness. The controller 200 of the electric vehicle 21 is configured to close a charging loop of the electric vehicle 21 when receiving the closing signal, and to feed back a feedback signal indicating that the charging loop of the electric vehicle is closed to the controller 200 of the electric vehicle 20, so that the electric vehicle 21 is in a state to be charged that can receive electric energy. The controller 200 of the power supply vehicle 20 is configured to close a charging circuit of the power supply vehicle 20 after receiving a feedback signal fed back from the power receiver vehicle 21, and cause the power supply vehicle 20 to output a power supply current to power the power receiver vehicle 21 via a high-voltage cable of the dc charging harness 22.

According to some embodiments of the present application, a vehicle-to-vehicle charging method is provided, and the method can be applied to the electric power supply vehicle and the electric power receiving vehicle, so as to realize vehicle-to-vehicle charging. As shown in fig. 5, the vehicle-to-vehicle charging method includes:

S101, a power supply vehicle sends a closing signal to a trolley bus through a low-voltage cable of a direct-current charging harness;

s102, closing a charging loop of the trolley bus according to a closing signal;

s103, the electric power receiving vehicle feeds back a feedback signal indicating that a charging loop of the electric power receiving vehicle is closed to the power supply vehicle through a low-voltage cable;

and S104, the power supply vehicle is used for closing the charging loop of the power supply vehicle to output a power supply current through the high-voltage cable of the direct-current charging wire harness to supply power to the power supply vehicle in response to receiving a feedback signal indicating that the charging loop of the power supply vehicle is closed from the power supply vehicle through the low-voltage cable.

In some embodiments, the low voltage cable of the dc charging harness uses a CAN bus protocol, such as the CH CAN (Chassis CAN) bus protocol, for signal transmission between the supply and the receive vehicles. After the power supply vehicle and the power receiving vehicle are connected with the direct current charging wire harness, the CC2 (gun inserting connection) signal can be detected first, and whether the CC2 signal of the power supply vehicle and the power receiving vehicle is effective or not can be judged. If the power supply vehicle judges that the CC2 signal is valid, the controller of the power supply vehicle initiates a handshake request for handshake with the controller of the power supply vehicle. Similarly, if the trolley bus determines that the CC2 signal is valid, the controller of the trolley bus initiates a handshake request for handshake with the controller of the power supply bus.

As a possible implementation manner, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS and the VCU, the BMS/VCU of the electric power supply vehicle initiates a handshake request for handshake with the BMS/VCU of the electric power receiving vehicle. Similarly, if the current collector determines that the CC2 signal is valid, the BMS/VCU of the current collector initiates a handshake request with the BMS/VCU of the current collector when the controller of the current collector and the controller of the current collector are both one of the BMS and VCU.

As a further possible embodiment, if the controller of the electric power supply vehicle includes a BMS and the controller of the electric power receiving vehicle is one of the BMS and the VCU, a handshake request for handshake with the BMS/VCU of the electric power supply vehicle is initiated by the BMS of the electric power supply vehicle. Similarly, if the train determines that the CC2 signal is valid, the BMS/VCU of the train initiates a handshake request for handshake with the BMS of the power supply train.

Alternatively, if the controller of the electric power supply vehicle is one of the BMS and the VCU and the controller of the electric power receiving vehicle includes the BMS, a handshake request for handshake with the BMS of the electric power receiving vehicle is issued by the BMS/VCU of the electric power supply vehicle. Similarly, if the train determines that the CC2 signal is valid, the BMS of the train initiates a handshake request for handshake with the BMS/VCU of the power supply train.

After the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle succeed in handshake, the controller of the electric power supply vehicle generates a closing signal indicating that the charging circuit of the electric power receiving vehicle is closed and forwards the closing signal to the controller of the electric power receiving vehicle. And after receiving the closing signal, the controller of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the electric car to be in a state to be charged capable of receiving electric energy. The charging circuit is an electric circuit for charging and discharging the battery.

As a possible implementation manner, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS and the VCU, after the successful handshake between the BMS/VCU of the electric power supply vehicle and the BMS/VCU of the electric power receiving vehicle, the BMS/VCU of the electric power supply vehicle generates a closing signal indicating that the charging circuit of the electric power receiving vehicle is closed, and transmits the closing signal to the BMS/VCU of the electric power receiving vehicle through the BMS/VCU of the electric power supply vehicle. After receiving the closing signal, the BMS/VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the electric car to be in a state to be charged capable of receiving electric energy.

As yet another possible embodiment, if the controller of the electric power supply vehicle includes a VCU and a BMS, and the controller of the electric power supply vehicle is one of the BMS and the VCU, after the successful handshake between the BMS of the electric power supply vehicle and the BMS/VCU of the electric power supply vehicle, the VCU of the electric power supply vehicle generates a closing signal indicating that the charging circuit of the electric power supply vehicle is closed, and forwards the closing signal to the BMS/VCU of the electric power supply vehicle through the BMS of the electric power supply vehicle. After receiving the closing signal, the BMS/VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the electric car to be in a state to be charged capable of receiving electric energy. Or if the controller of the electric power supply vehicle is one of the BMS and the VCU, and the controller of the electric power receiving vehicle comprises the VCU and the BMS, after the BMS/VCU of the electric power supply vehicle and the BMS of the electric power receiving vehicle are successfully handshaking, the BMS/VCU of the electric power supply vehicle generates a closing signal for indicating that a charging loop of the electric power receiving vehicle is closed and forwards the closing signal to the BMS of the electric power receiving vehicle. After receiving the closing signal, the BMS of the electric car controls the relay of the charging loop of the electric car to be closed through the VCU of the electric car, so that the electric car is in a state to be charged capable of receiving electric energy.

As another possible embodiment, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle each include a BMS and a VCU, after the successful handshake between the BMS of the electric power supply vehicle and the BMS of the electric power receiving vehicle, the VCU of the electric power supply vehicle generates a closing signal indicating that the charging circuit of the electric power receiving vehicle is closed and forwards the closing signal to the BMS of the electric power receiving vehicle through the BMS of the electric power supply vehicle. After receiving the closing signal, the BMS of the electric car controls the relay of the charging loop of the electric car to be closed through the VCU of the electric car, so that the electric car is in a state to be charged capable of receiving electric energy.

After the charging circuit for controlling the electric car is closed, the controller of the electric car can detect whether the charging circuit of the electric car has an open circuit fault. If the controller of the electric vehicle comprises the BMS and does not comprise the VCU, the BMS can be used for detecting whether an open circuit fault exists in a charging loop of the electric vehicle; if the controller of the electric vehicle includes a VCU, it is possible to detect whether an open circuit fault exists in the charging circuit of the electric vehicle through the VCU. For example, whether the charging circuit of the electric car has an open circuit fault can be judged by a voltage/current diagnosis method.

And generating alarm information until the open circuit fault of the charging circuit of the electric car is removed under the condition that the open circuit fault of the charging circuit of the electric car is determined. In the case where it is determined that the charging circuit of the electric power receiver does not have an open circuit fault, the controller of the electric power receiver may generate a feedback signal indicating that the charging circuit of the electric power receiver is closed, and transmit the feedback signal to the controller of the electric power supply via the low voltage cable by the controller of the electric power receiver. After receiving the feedback signal sent by the electric power receiver, the controller of the electric power supply vehicle controls the relay of the charging loop of the electric power supply vehicle to be closed so as to enable the charging loop of the electric power supply vehicle to be in an energy supply state, and accordingly, the high-voltage cable of the direct-current charging wire harness outputs a power supply current to supply power for the electric power receiver vehicle.

As a possible implementation manner, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS and the VCU, if it is determined that the charging circuit of the electric power receiving vehicle has no open fault, the BMS/VCU of the electric power receiving vehicle may generate a feedback signal indicating that the charging circuit of the electric power receiving vehicle is closed, and transmit the feedback signal to the BMS/VCU of the electric power supply vehicle through the low voltage cable by the BMS/VCU of the electric power receiving vehicle. After receiving the feedback signal sent by the electric car, the BMS/VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state, and accordingly, the electric car is powered by outputting a power supply current through the high-voltage cable of the direct-current charging wire harness.

As a further possible embodiment, if the controller of the electric power supply vehicle includes a VCU and a BMS, and the controller of the electric power receiving vehicle is one of the BMS and the VCU, in case it is determined that the charging circuit of the electric power receiving vehicle does not have an open fault, the BMS/VCU of the electric power receiving vehicle may generate a feedback signal indicating that the charging circuit of the electric power receiving vehicle is closed, and transmit the feedback signal to the BMS of the electric power supply vehicle through the low voltage cable by the BMS/VCU of the electric power receiving vehicle. After receiving the feedback signal sent by the electric car, the BMS of the electric car forwards the feedback signal to the VCU of the electric car, and the VCU of the electric car controls the relay of the charging loop of the electric car to be closed so that the charging loop of the electric car is in an energy supply state, thereby outputting the supply current through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car. Alternatively, if the controller of the electric power supply car is one of the BMS or the VCU, and the controller of the electric power supply car includes the VCU and the BMS, the VCU of the electric power supply car may generate a feedback signal indicating that the charging circuit of the electric power supply car is closed and transmit the feedback signal to the BMS/VCU of the electric power supply car through the low voltage cable by the BMS of the electric power supply car in case it is determined that the charging circuit of the electric power supply car has no open fault. After receiving the feedback signal sent by the electric car, the BMS/VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state, and accordingly, the electric car is powered by outputting a power supply current through the high-voltage cable of the direct-current charging wire harness.

As another possible embodiment, if the controller of the electric power receiving car and the controller of the electric power supplying car each include the BMS and the VCU, in case it is determined that the charging circuit of the electric power receiving car does not have an open fault, the VCU of the electric power receiving car may generate a feedback signal indicating that the charging circuit of the electric power receiving car is closed, and transmit the feedback signal to the BMS of the electric power supplying car through the low voltage cable by the BMS of the electric power receiving car. After receiving the feedback signal sent by the electric car, the BMS of the electric car forwards the feedback signal to the VCU of the electric car, and the VCU of the electric car controls the relay of the charging loop of the electric car to be closed so that the charging loop of the electric car is in an energy supply state, thereby outputting the supply current through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car.

In consideration of the fact that the battery voltages between the power receiving car and the power supplying car are not necessarily the same, when the charging circuit of the power supplying car is in a power supplying state, the high-voltage output power of the charging circuit of the power supplying car can be adjusted through the DC-DC module in the power supplying car, so that the output power supplying current can supply power for the power receiving car.

According to the vehicle-to-vehicle charging method, the power supply vehicle sends a closing signal to the electric vehicle through the low-voltage cable of the direct-current charging wire harness, so that the electric vehicle closes a charging loop of the electric vehicle according to the closing signal, and sends a feedback signal indicating that the charging loop of the electric vehicle is closed to the power supply vehicle through the low-voltage cable, so that the power supply vehicle closes the charging loop of the electric vehicle, and the electric vehicle is powered by the power supply vehicle through the high-voltage cable of the direct-current charging wire harness. Therefore, the power supply vehicle and the electric vehicle automatically perform signal transmission and charge and discharge control through the direct current charging wire harness, a charger is not required to be arranged, the hardware cost required by vehicle-to-vehicle charging is reduced, and the universality and the flexibility of vehicle-to-vehicle charging are improved.

In some embodiments, to improve the safety and charging efficiency of vehicle-to-vehicle charging, as shown in fig. 6, a power supply vehicle sends a closing signal to a power receiver vehicle through a low voltage cable of a direct current charging harness, including:

s201, the power supply vehicle sends an energy supplementing signal to the power supply vehicle through a low-voltage cable;

s202, the power supply vehicle responds to the received energy supplementing signal to acquire the current state of the power supply vehicle;

s203, when the current state of the power supply vehicle is an energy-available state, a closing signal is sent to the power supply vehicle through a low-voltage cable;

wherein the energizable state includes at least one of a stationary state and a low power consumption state.

In some embodiments, the energy replenishment signal may be generated by the controller of the electric power receiving vehicle when detecting that the battery of the electric power receiving vehicle has a charging demand, for example, when detecting that the current battery power of the electric power receiving vehicle is lower than a preset power, so as to indicate that the battery of the electric power receiving vehicle has a charging demand through the energy replenishment signal. After the controller of the electric power receiving vehicle generates the energy supplementing signal, the controller of the electric power receiving vehicle sends the energy supplementing signal to the controller of the electric power supplying vehicle. After receiving the energy supplementing signal through the low-voltage cable, the controller of the electric power supply vehicle detects the current state of the electric power supply vehicle and judges whether the current state of the electric power supply vehicle is in an energy-available state such as a static state or a low-power consumption state. The stationary state is a parking state in which the vehicle body is not powered, the engine or the motor is not operated, and the electric appliances are not operated. The low power consumption state refers to a state in which the current power consumption of the vehicle is lower than the preset power consumption or the current power consumption of the vehicle is lower than the preset power consumption. If the power supply vehicle is in a stationary state or a low power consumption state, the current state of the power supply vehicle can be determined to be an energy-available state capable of supplying energy to the power supply vehicle. When the current state of the power supply vehicle is detected to be in an energy-supplying state such as a stationary state or a low power consumption state, the power supply vehicle is enabled to supply power, a closing signal is generated by a controller of the power supply vehicle, and the closing signal is transmitted to a controller of the power receiving vehicle by the controller of the power supply vehicle through a low voltage cable. If the current state of the power supply vehicle is detected to be not in the energy supply state, a prompt message for prompting that the energy supplementing signal is invalid is sent to the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle.

As a possible implementation manner, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS or the VCU, the energy supplementing signal may be generated by the BMS/VCU of the electric power receiving vehicle when detecting that the battery of the electric power receiving vehicle has a charging requirement, so as to indicate that the battery of the electric power receiving vehicle has a charging requirement through the energy supplementing signal. After generating the energy compensation signal, the BMS/VCU of the electric power receiving vehicle transmits the energy compensation signal to the BMS/VCU of the electric power supplying vehicle. After receiving the energy supplementing signal through the low-voltage cable, the BMS/VCU of the electric power supply vehicle detects the current state of the electric power supply vehicle and judges whether the current state of the electric power supply vehicle is in an energy-available state such as a static state or a low-power consumption state. If the current state of the power supply vehicle is detected to be in an energy-supplying state such as a static state or a low power consumption state, the power supply vehicle is indicated to be capable of supplying power, so that a closing signal is generated by the BMS/VCU of the power supply vehicle, and the closing signal is sent to the BMS/VCU of the power receiving vehicle by the BMS/VCU of the power supply vehicle through a low-voltage cable. If the current state of the power supply vehicle is detected not to be the energy-available state, the BMS/VCU of the power supply vehicle sends prompt information for prompting that the energy supplementing signal is invalid to the BMS/VCU of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle.

As yet another possible embodiment, if the controller of the electric power supply vehicle includes a VCU and a BMS, and the controller of the electric power receiving vehicle is one of the BMS or the VCU, the energy supplement signal may be generated by the BMS/VCU of the electric power receiving vehicle upon detecting that the battery of the electric power receiving vehicle has a charging demand, to indicate that the battery of the electric power receiving vehicle has a charging demand through the energy supplement signal. After generating the energy supplement signal, the BMS/VCU of the electric power receiving vehicle transmits the energy supplement signal to the BMS of the electric power supplying vehicle. After the BMS of the power supply vehicle receives the energy supplementing signal through the low-voltage cable, the VCU of the power supply vehicle detects the current state of the power supply vehicle and judges whether the current state of the power supply vehicle is in an energy-available state such as a static state or a low-power consumption state. If the current state of the power supply vehicle is detected to be in an energy-supplying state such as a static state or a low power consumption state, the power supply vehicle is indicated to be capable of supplying power, a closing signal is generated by the VCU of the power supply vehicle, and the closing signal is transmitted to the BMS/VCU of the power receiving vehicle by the BMS of the power supply vehicle through a low voltage cable. If the current state of the power supply vehicle is detected not to be the energy-available state, the BMS of the power supply vehicle sends a prompt message for prompting that the energy supplementing signal is invalid to the BMS/VCU of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. Alternatively, if the controller of the electric power supply vehicle is one of the BMS and the VCU, and the controller of the electric power receiving vehicle includes the VCU and the BMS, the energy compensating signal may be generated by the VCU of the electric power receiving vehicle when detecting that the battery of the electric power receiving vehicle has a charging demand, so as to indicate that the battery of the electric power receiving vehicle has a charging demand through the energy compensating signal. After the VCU of the electric power receiving vehicle generates the energy compensation signal, the BMS of the electric power receiving vehicle transmits the energy compensation signal to the BMS/VCU of the electric power feeding vehicle. After the BMS/VCU of the power supply vehicle receives the energy supplementing signal through the low-voltage cable, the BMS/VCU of the power supply vehicle detects the current state of the power supply vehicle and judges whether the current state of the power supply vehicle is in an energy-available state such as a static state or a low-power consumption state. When the current state of the power supply vehicle is detected to be in an energy-supplying state such as a stationary state or a low power consumption state, the power supply vehicle is indicated to be capable of supplying power, a closing signal is generated by the BMS/VCU of the power supply vehicle, and the closing signal is transmitted to the BMS of the power receiving vehicle through the low voltage cable. If the current state of the power supply vehicle is detected not to be the energy-available state, the BMS/VCU of the power supply vehicle sends a prompt message for prompting that the energy supplementing signal is invalid to the BMS of the power receiving vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle.

As another possible embodiment, if the controller of the electric power receiving vehicle and the controller of the electric power supplying vehicle each include a BMS and a VCU, the power supplementing signal may be generated by the VCU of the electric power receiving vehicle upon detecting that the battery of the electric power receiving vehicle has a charging demand, so as to indicate that the battery of the electric power receiving vehicle has a charging demand through the power supplementing signal. After generating the energy supplement signal, the VCU of the electric power receiving vehicle transmits the energy supplement signal to the BMS of the power feeding vehicle. After the BMS of the power supply vehicle receives the energy supplementing signal through the low-voltage cable, the VCU of the power supply vehicle detects the current state of the power supply vehicle and judges whether the current state of the power supply vehicle is in an energy-available state such as a static state or a low-power consumption state. When the current state of the power supply vehicle is detected to be in an energy-supplying state such as a stationary state or a low power consumption state, the power supply vehicle is indicated to be capable of supplying power, a closing signal is generated by the VCU of the power supply vehicle, and the closing signal is transmitted to the BMS of the power receiving vehicle by the BMS of the power supply vehicle through a low voltage cable. If the current state of the power supply vehicle is detected not to be the energy-available state, the BMS of the power supply vehicle sends prompt information for prompting that the energy supplementing signal is invalid to the BMS of the power receiving vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle.

Under the condition that the energy supplementing signal sent by the electric car is received, the current state of the electric car is detected, and when the current state of the electric car is determined to be the energy supplying state, the electric car sends a closing signal to the electric car, so that the follow-up battery for supplying power to the electric car is a battery with low utilization rate, the condition of overload of the battery is reduced, and the safety and the charging efficiency of charging the electric car are improved.

In some embodiments, to improve the safety of vehicle-to-vehicle charging, the energy replenishment signal includes battery pack information of the electric vehicle; the power supply car sends the closure signal to the tram through low voltage cable, includes:

when the battery pack information of the power supply vehicle is not abnormal, the power supply vehicle transmits a closing signal to the power supply vehicle via the low-voltage cable.

The battery pack information of the trolley bus comprises information such as the current battery capacity, fault codes, the current battery temperature and the like of the battery pack of the trolley bus. As one possible implementation manner, the battery pack information of the electric car may include a current battery power, a fault code and a current battery temperature, and after the electric car receives the energy supplementing signal, the electric car extracts the battery pack information of the electric car from the energy supplementing signal, and detects whether the current battery power of the battery pack of the electric car is smaller than a preset power, whether the fault code exists in the battery pack of the electric car, and whether the current battery temperature of the battery pack of the electric car is greater than the preset temperature. If the current battery electric quantity of the battery pack of the electric car is smaller than the preset electric quantity, the fault code does not exist, and meanwhile, the current battery temperature is smaller than the preset temperature, the battery pack information of the electric car is not abnormal, and otherwise, the battery pack information of the electric car is abnormal. The preset electric quantity and the preset temperature can be set according to actual conditions.

If the battery pack information of the electric car is abnormal, sending prompt information for prompting that the battery pack of the electric car does not meet the specified charging requirement of the power supply car to the electric car through the low-voltage cable so as to stop charging the electric car. If it is determined that the battery pack information of the electric power receiving vehicle is not abnormal, it indicates that the electric power receiving vehicle can be charged, and at this time, a closing signal can be transmitted from the power feeding vehicle to the electric power receiving vehicle through the low voltage cable.

As a possible embodiment, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are one of the BMS and the VCU, the BMS/VCU of the electric power supply vehicle extracts the battery pack information of the electric power receiving vehicle from the energy supplementing signal after receiving the energy supplementing signal, and detects whether the battery pack information of the electric power receiving vehicle is abnormal. If the battery pack information of the electric power receiving vehicle is abnormal, the BMS/VCU of the electric power supplying vehicle sends prompt information for prompting that the battery pack of the electric power receiving vehicle does not meet the specified charging requirement of the electric power supplying vehicle to the BMS/VCU of the electric power receiving vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that the battery pack information of the electric power receiving car is not abnormal, a closing signal may be transmitted from the BMS/VCU of the electric power supplying car to the BMS/VCU of the electric power receiving car through the low voltage cable.

As still another possible embodiment, if the controller of the electric power supply vehicle includes a VCU and a BMS, and the controller of the electric power supply vehicle is one of the BMS and the VCU, the BMS of the electric power supply vehicle receives the energy supplement signal, extracts battery pack information of the electric power supply vehicle from the energy supplement signal by the BMS or the VCU of the electric power supply vehicle, and detects whether the battery pack information of the electric power supply vehicle is abnormal by the VCU of the electric power supply vehicle. If the VCU of the power supply vehicle determines that the battery pack information of the power supply vehicle is abnormal, the BMS of the power supply vehicle sends prompt information for prompting that the battery pack of the power supply vehicle does not meet the specified charging requirement of the power supply vehicle to the BMS/VCU of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that the battery pack information of the electric power receiving car is not abnormal, a closing signal may be transmitted from the BMS of the electric power supplying car to the BMS/VCU of the electric power receiving car through the low voltage cable. Alternatively, if the controller of the electric power supply vehicle is one of the BMS and the VCU and the controller of the electric power receiving vehicle includes the VCU and the BMS, the BMS/VCU of the electric power supply vehicle extracts the battery pack information of the electric power receiving vehicle from the energy supplementing signal after receiving the energy supplementing signal and detects whether the battery pack information of the electric power receiving vehicle is abnormal. If the BMS/VCU of the power supply vehicle determines that the battery pack information of the power supply vehicle is abnormal, the BMS of the power supply vehicle sends prompt information for prompting that the battery pack of the power supply vehicle does not meet the specified charging requirement of the power supply vehicle to the BMS of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that the battery pack information of the electric power receiving car is not abnormal, a closing signal may be transmitted from the BMS/VCU of the electric power supplying car to the BMS of the electric power receiving car through the low voltage cable.

As another possible embodiment, if the controller of the electric power car and the controller of the electric power car each include a BMS and a VCU, the BMS of the electric power car extracts battery pack information of the electric power car from the energy supplementing signal by the BMS or the VCU of the electric power car after receiving the energy supplementing signal, and the VCU of the electric power car detects whether the battery pack information of the electric power car is abnormal. If the VCU of the power supply vehicle determines that the battery pack information of the power supply vehicle is abnormal, the BMS of the power supply vehicle sends prompt information for prompting that the battery pack of the power supply vehicle does not meet the specified charging requirement of the power supply vehicle to the BMS of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that the battery pack information of the electric power receiving car is not abnormal, a closing signal may be transmitted from the BMS of the electric power supplying car to the BMS of the electric power receiving car through the low voltage cable.

The battery pack information of the power supply vehicle is detected in the power supply vehicle to send a closing signal to the power supply vehicle through the low-voltage cable under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, so that the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

In some embodiments, to further improve the safety of the vehicle-to-vehicle charging, the closure signal includes battery pack information for the power supply vehicle; the charge circuit of the closed tram of tram according to closure signal includes:

When the battery pack information of the power supply vehicle is not abnormal, the charging circuit of the power receiving vehicle is closed.

The battery pack information of the power supply vehicle comprises information such as the current battery capacity, fault codes, the current battery temperature and the like of the battery pack of the power supply vehicle. As one possible implementation manner, the battery pack information of the electric power supply vehicle may include a current battery power, a fault code and a current battery temperature, and after the electric power supply vehicle receives a closing signal, the electric power supply vehicle extracts the battery pack information of the electric power supply vehicle from the closing signal, and detects whether the current battery power of the battery pack of the electric power supply vehicle is less than a preset power, whether the fault code exists in the battery pack of the electric power supply vehicle, and whether the current battery temperature of the battery pack of the electric power supply vehicle is greater than the preset temperature. If the current battery electric quantity of the battery pack of the power supply vehicle is smaller than the preset electric quantity, the fault code does not exist, and meanwhile, the current battery temperature is smaller than the preset temperature, the battery pack information of the power supply vehicle is not abnormal, and otherwise, the battery pack information of the power supply vehicle is abnormal.

If the battery pack information of the electric power supply vehicle is abnormal, sending a prompt message for prompting that the battery pack of the electric power supply vehicle does not meet the charging requirement appointed by the electric power receiver vehicle to the electric power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the electric power receiver vehicle. If it is determined that the battery pack information of the power supply vehicle is not abnormal, it means that the power supply vehicle can supply power, and at this time, the charging circuit of the power receiving vehicle can be closed.

As a possible embodiment, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS and the VCU, the BMS/VCU of the electric power receiving vehicle extracts the battery pack information of the electric power supply vehicle from the closing signal after receiving the closing signal, and detects whether the battery pack information of the electric power supply vehicle is abnormal. If the battery pack information of the electric power supply vehicle is abnormal, the BMS/VCU of the electric power supply vehicle sends prompt information for prompting that the battery pack of the electric power supply vehicle does not meet the charging requirement appointed by the electric power supply vehicle to the BMS/VCU of the electric power supply vehicle through a low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that there is no abnormality in the battery pack information of the power supply vehicle, the charging circuit of the power supply vehicle may be closed by the BMS/VCU of the power supply vehicle.

As still another possible embodiment, if the controller of the electric power supply vehicle includes a VCU and a BMS, and the controller of the electric power receiving vehicle includes one of the BMS and the VCU, the BMS/VCU of the electric power receiving vehicle extracts battery pack information of the electric power supply vehicle from the closing signal after receiving the closing signal, and detects whether the battery pack information of the electric power supply vehicle is abnormal. If the battery pack information of the electric power supply vehicle is abnormal, the BMS/VCU of the electric power supply vehicle sends prompt information for prompting that the battery pack of the electric power supply vehicle does not meet the specified charging requirement of the electric power supply vehicle to the BMS of the electric power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that there is no abnormality in the battery pack information of the power supply vehicle, the charging circuit of the power supply vehicle may be closed by the BMS/VCU of the power supply vehicle. Alternatively, if the controller of the electric power supply vehicle is one of the BMS and the VCU, and the controller of the electric power supply vehicle includes the VCU and the BMS, the BMS of the electric power supply vehicle receives the closing signal, and then the BMS or the VCU of the electric power supply vehicle extracts the battery pack information of the electric power supply vehicle from the closing signal, and the VCU of the electric power supply vehicle detects whether the battery pack information of the electric power supply vehicle is abnormal. If the battery pack information of the electric power supply vehicle is determined to be abnormal, the BMS of the electric power supply vehicle sends prompt information for prompting that the battery pack of the electric power supply vehicle does not meet the specified charging requirement of the electric power supply vehicle to the BMS/VCU of the electric power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the electric power supply vehicle. If it is determined that there is no abnormality in the battery pack information of the power supply vehicle, the charging circuit of the power receiving vehicle may be closed by the VCU of the power receiving vehicle.

As another possible embodiment, if the controller of the electric power receiving vehicle and the controller of the electric power supplying vehicle each include a BMS and a VCU, the BMS of the electric power receiving vehicle extracts battery pack information of the electric power supplying vehicle from the closed signal by the BMS or the VCU of the electric power receiving vehicle after receiving the closed signal, and detects whether the battery pack information of the electric power supplying vehicle is abnormal by the VCU of the electric power receiving vehicle. If the battery pack information of the power supply vehicle is determined to be abnormal, the BMS of the power supply vehicle sends prompt information for prompting that the battery pack of the power supply vehicle does not meet the specified charging requirement of the power supply vehicle to the BMS of the power supply vehicle through the low-voltage cable so as to stop the vehicle to charge the vehicle. If it is determined that there is no abnormality in the battery pack information of the power supply vehicle, the charging circuit of the power receiving vehicle may be closed by the VCU of the power receiving vehicle.

The battery pack information of the power supply vehicle in the closed signal is detected through the power supply vehicle, so that the charging loop of the power supply vehicle is closed again under the condition that the battery pack information of the power supply vehicle is determined to be not abnormal, the potential safety hazard of charging caused by the abnormal battery of the power supply vehicle is avoided, and the safety of charging the vehicle to the vehicle is improved.

After the charge circuit of the electric power receiving vehicle is closed, the controller of the electric power receiving vehicle may generate a feedback signal indicating that the charge circuit of the electric power receiving vehicle is closed, and the controller of the electric power receiving vehicle may transmit the feedback signal to the controller of the electric power supplying vehicle through the low voltage cable. After receiving the feedback signal sent by the electric car, the controller of the electric car forwards the feedback signal to the controller of the electric car, and the controller of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state and send message information to the DC-DC module, so that the DC-DC module adjusts the output power of the charging loop of the electric car, thereby achieving the purpose of controlling the supply current and outputting the supply current through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car.

As a possible implementation manner, if the controller of the electric power supply vehicle and the controller of the electric power receiving vehicle are both one of the BMS and the VCU, after the charging circuit of the electric power receiving vehicle is closed, the BMS/VCU of the electric power receiving vehicle may generate a feedback signal indicating that the charging circuit of the electric power receiving vehicle is closed, and the feedback signal may be transmitted from the BMS/VCU of the electric power receiving vehicle to the BMS/VCU of the electric power supply vehicle through the low voltage cable. After receiving the feedback signal sent by the electric power receiver, the BMS/VCU of the electric power supply vehicle forwards the feedback signal to the BMS/VCU of the electric power supply vehicle, and the BMS/VCU of the electric power supply vehicle controls the relay of the charging loop of the electric power supply vehicle to be closed so as to enable the charging loop of the electric power supply vehicle to be in an energy supply state and send message information to the DC-DC module, so that the DC-DC module adjusts the output power of the charging loop of the electric power supply vehicle, thereby achieving the purpose of controlling the supply current and outputting the supply current through the high-voltage cable of the direct-current charging harness to supply power for the electric power receiver.

As a further possible embodiment, if the controller of the electric power supply car includes a VCU and a BMS, and the controller of the electric power receiving car includes one of the BMS and the VCU, the BMS/VCU of the electric power receiving car may generate a feedback signal indicating that the charging loop of the electric power receiving car is closed after the charging loop of the electric power receiving car is closed, and transmit the feedback signal to the BMS of the electric power supply car through a low voltage cable by the BMS/VCU of the electric power receiving car. After receiving the feedback signal sent by the electric car, the BMS of the electric car forwards the feedback signal to the VCU of the electric car, and the VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state and send message information to the DC-DC module, so that the DC-DC module adjusts the output power of the charging loop of the electric car, and the purpose of controlling the supply current is achieved, and the supply current is output through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car. Alternatively, if the controller of the electric power supply vehicle is one of the BMS and the VCU, and the controller of the electric power receiving vehicle includes the VCU and the BMS, the VCU of the electric power receiving vehicle may generate a feedback signal indicating that the charging circuit of the electric power receiving vehicle is closed after the charging circuit of the electric power receiving vehicle is closed, and the feedback signal may be transmitted from the BMS of the electric power receiving vehicle to the BMS/VCU of the electric power supply vehicle through the low voltage cable. After receiving the feedback signal sent by the electric car, the BMS/VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state and send message information to the DC-DC module, so that the DC-DC module adjusts the output power of the charging loop of the electric car, the purpose of controlling the power supply current is achieved, and the power supply current is output through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car.

As another possible embodiment, if the controller of the electric power receiving car and the controller of the electric power supplying car each include a BMS and a VCU, after the charging loop of the electric power receiving car is closed, the VCU of the electric power receiving car may generate a feedback signal indicating that the charging loop of the electric power receiving car is closed, and transmit the feedback signal to the BMS of the electric power supplying car through the low voltage cable by the BMS of the electric power receiving car. After receiving the feedback signal sent by the electric car, the BMS of the electric car forwards the feedback signal to the VCU of the electric car, and the VCU of the electric car controls the relay of the charging loop of the electric car to be closed so as to enable the charging loop of the electric car to be in an energy supply state and send message information to the DC-DC module, so that the DC-DC module adjusts the output power of the charging loop of the electric car, and the purpose of controlling the supply current is achieved, and the supply current is output through the high-voltage cable of the direct-current charging wire harness to supply power for the electric car.

To improve the safety of the power supply process of the power supply vehicle, in some embodiments, the power supply current output by the power supply vehicle may be determined according to the current battery state of the power supply vehicle.

As a possible implementation manner, after the charging loop of the power supply vehicle is closed, the current battery state of the power supply vehicle can be obtained in real time through the controller of the power supply vehicle, then the current battery state is matched with a mapping table in which each battery state and each target power are recorded in advance, so that after the target power corresponding to the current battery state is obtained from the mapping table, the message information of the target power is forwarded to the DC-DC module of the power supply vehicle, so that the DC-DC module adjusts the output power to the target power, and the power supply current output by the power supply vehicle is adjusted. The target power corresponding to the battery state can be determined according to actual conditions, so that the power supply current output by the power supply vehicle accords with the current power supply capacity of the power supply vehicle, the output protection of the power supply vehicle is realized, and the safety of the power supply process of the power supply vehicle is improved. Wherein, if the controller of the electric power supply vehicle includes the VCU and does not include the BMS, the above steps may be performed by the VCU of the electric power supply vehicle; if the controller of the power supply vehicle includes a BMS, the above steps may be performed by the BMS of the power supply vehicle.

As a possible implementation manner, if the current battery state of the electric power supply vehicle meets a preset condition, such as the current battery temperature is greater than a preset temperature threshold, or the battery power of the electric power supply vehicle is less than a preset power threshold, it indicates that the battery of the electric power supply vehicle does not meet the power supply requirement. In this case, the controller of the electric power supply vehicle can disconnect the charging circuit of the electric power supply vehicle and stop charging the vehicle. The preset temperature threshold and the preset electric quantity threshold can be set according to actual conditions. Wherein, if the controller of the electric power supply vehicle includes the BMS instead of the VCU, the charging circuit of the electric power supply vehicle is disconnected through the BMS of the electric power supply vehicle; if the controller of the electric power supply vehicle includes a VCU, the charging circuit of the electric power supply vehicle is disconnected by the VCU of the electric power supply vehicle.

When the current battery state of the power supply vehicle meets the preset condition that the current battery temperature is greater than a preset temperature threshold value or the battery electric quantity of the power supply vehicle is smaller than a preset electric quantity threshold value, a charging loop of the power supply vehicle is disconnected, so that potential safety hazards of charging caused by overlarge high temperature or battery loss are avoided, and the safety of the power supply process of the power supply vehicle is improved.

In some embodiments, further comprising: when the current state of the electric vehicle is an operation state, the load operation of the electric vehicle is controlled according to the power supply current.

In some embodiments, the controller of the electric power receiving vehicle receives a supply current through the high voltage cable, and charges the battery of the electric power receiving vehicle with the supply current. Meanwhile, in the charging process, the controller of the trolley bus can monitor the current state of the trolley bus in real time. If the current state of the electric car is a static state, continuously charging a battery of the electric car by using a power supply current; if the current state of the electric car is an operation state, such as that of a certain load in the electric car, the power supply current is controlled by the controller of the electric car to supply power to the load in the operation state in the electric car while the battery of the electric car is charged by the power supply current, so that the load is controlled to operate, and the utilization rate of the power supply current is improved.

As a possible embodiment, if the controller of the electric power receiving vehicle is one of the BMS and the VCU, the BMS/VCU of the electric power receiving vehicle receives a power supply current through the high voltage cable and charges the battery of the electric power receiving vehicle with the power supply current. Meanwhile, in the charging process, the BMS/VCU of the electric car can monitor the current state of the electric car in real time. If the current state of the electric car is a static state, continuously charging a battery of the electric car by using a power supply current; if the current state of the electric car is an operation state, such as a certain load in the electric car is operated, the battery of the electric car is charged by the power supply current, and the power supply current is controlled by the BMS/VCU of the electric car to supply power to the load in the operation state in the electric car so as to control the load to operate.

As another possible embodiment, if the controller of the electric power receiving vehicle includes the BMS and the VCU, the BMS of the electric power receiving vehicle receives a power supply current through the high voltage cable and charges a battery of the electric power receiving vehicle with the power supply current. Meanwhile, in the charging process, the VCU of the trolley bus can monitor the current state of the trolley bus in real time. If the current state of the electric car is a static state, continuously charging a battery of the electric car by using a power supply current; if the current state of the electric car is an operation state, such as a certain load in the electric car is operated, the power supply current is controlled by the VCU of the electric car to supply power to the load in the operation state in the electric car while charging the battery of the electric car with the power supply current, so as to control the load to operate.

Fig. 7 shows a schematic block diagram of a vehicle-to-vehicle charging device according to an embodiment of the present application, and it should be understood that the device corresponds to the method embodiment executed in fig. 5 to 6, and is capable of executing the steps involved in the foregoing method, and specific functions of the device may be referred to in the foregoing description, and detailed descriptions thereof are omitted herein as appropriate to avoid redundancy. The device includes at least one software functional module that can be stored in memory in the form of software or firmware (firmware) or cured in the Operating System (OS) of the device. Specifically, the device is applied to the power supply car, includes: a signal transmitting module 501, configured to transmit a closing signal to the electric vehicle through a low voltage cable of the dc charging harness, so that the electric vehicle closes a charging loop of the electric vehicle according to the closing signal; the current output module 502 is configured to close a charging loop of the power supply vehicle to output a supply current to the power supply vehicle through a high-voltage cable of the direct-current charging harness in response to receiving a feedback signal indicating that the charging loop of the power supply vehicle is closed from the power supply vehicle through the low-voltage cable.

According to some embodiments of the present application, the signaling module 501 is specifically configured to: acquiring the current state of the electric power supply vehicle in response to receiving the energy supplementing signal sent by the electric power supply vehicle through the low-voltage cable; under the condition that the current state is an energizable state, a closing signal is sent to the trolley bus through a low-voltage cable; wherein the energizable state includes at least one of a stationary state and a low power consumption state.

According to some embodiments of the present application, the energy replenishment signal includes battery pack information of the electric vehicle; the signal sending module 501 is specifically configured to: when there is no abnormality in the battery pack information of the electric vehicle, a closing signal is transmitted to the electric vehicle via a low-voltage cable.

According to some embodiments of the present application, the closure signal includes battery pack information for the power supply vehicle; the charging circuit of the electric power receiving vehicle is closed by the electric power receiving vehicle when it is determined that the battery pack information of the electric power supply vehicle is not abnormal.

According to some embodiments of the present application, the supply current is determined from a current battery state of the power supply vehicle.

According to some embodiments of the present application, the current output module 502 is further configured to: under the condition that the current battery state of the power supply vehicle meets the preset condition, the charging loop of the power supply vehicle is disconnected; the preset condition comprises at least one of the battery temperature of the electric power supply vehicle being greater than a preset temperature threshold and the battery electric power of the electric power supply vehicle being less than a preset electric power threshold.

Fig. 8 shows a schematic block diagram of a vehicle-to-vehicle charging device according to an embodiment of the present application, and it should be understood that the device corresponds to the method embodiment executed in fig. 5 to 6, and is capable of executing the steps involved in the foregoing method, and specific functions of the device may be referred to in the foregoing description, and detailed descriptions thereof are omitted herein as appropriate to avoid redundancy. The device includes at least one software functional module that can be stored in memory in the form of software or firmware (firmware) or cured in the Operating System (OS) of the device. Specifically, the device is applied to the tram, includes: the signal receiving module 601 is configured to receive a closing signal sent by the power supply vehicle through a low-voltage cable of the direct-current charging harness; the current input module 602 is configured to close a charging loop of the electric car according to the closing signal, and feed back a feedback signal indicating that the charging loop of the electric car is closed to the electric car through the low voltage cable, so that after the electric car closes the charging loop of the electric car according to the feedback signal, the electric car receives the power supply current of the electric car to charge through the high voltage cable of the direct current charging harness.

According to some embodiments of the present application, the signal receiving module 601 is specifically configured to: the method comprises the steps that an energy supplementing signal is sent to a power supply vehicle through a low-voltage cable, so that a closing signal fed back by the power supply vehicle according to the energy supplementing signal when the power supply vehicle is in an energy-supplying state is received through the low-voltage cable; wherein the energizable state includes at least one of a stationary state and a low power consumption state.

According to some embodiments of the present application, the energy replenishment signal includes battery pack information of the electric vehicle; the closing signal is generated by the power supply vehicle when it is determined that the battery pack information of the power receiving vehicle is not abnormal.

According to some embodiments of the present application, the closure signal includes battery pack information for the power supply vehicle; the current input module 602 is specifically configured to: when the battery pack information of the power supply vehicle is not abnormal, the charging circuit of the power receiving vehicle is closed.

According to some embodiments of the present application, the current input module 602 is further configured to: when the current state of the electric vehicle is an operation state, the load operation of the electric vehicle is controlled according to the power supply current.

According to some embodiments of the present application, as shown in fig. 9, embodiments of the present application provide a first electronic device 70, including: the first processor 701 and the first memory 702, the first processor 701 and the first memory 702 being interconnected and in communication with each other by a first communication bus 703 and/or other form of connection mechanism (not shown), the first memory 702 storing a computer program executable by the first processor 701, the first processor 701 executing the computer program when the computing device is running to perform the method performed by the power cart in any alternative implementation, such as: transmitting a closing signal to the electric vehicle through a low-voltage cable of the direct-current charging harness so that the electric vehicle closes a charging loop of the electric vehicle according to the closing signal; in response to receiving a feedback signal from the electric vehicle via the low voltage cable indicating closure of the charging loop of the electric vehicle, the charging loop of the electric vehicle is closed to output a supply current via the high voltage cable of the direct current charging harness to power the electric vehicle.

According to some embodiments of the present application, as shown in fig. 10, embodiments of the present application provide a second electronic device 80, including: the second processor 801 and the second memory 802, the second processor 801 and the second memory 802 being interconnected and in communication with each other by a second communication bus 803 and/or other form of connection mechanism (not shown), the second memory 802 storing a computer program executable by the second processor 801, the second processor 801 executing the computer program when the computing device is running to perform the method performed by the trolley side in any alternative implementation, such as: receiving a closing signal sent by a power supply vehicle through a low-voltage cable of a direct-current charging harness; according to the closed signal, the charging loop of the electric car is closed, and a feedback signal indicating the closing of the charging loop of the electric car is fed back to the electric car through the low-voltage cable, so that after the electric car closes the charging loop of the electric car according to the feedback signal, the electric car receives the power supply current of the electric car for charging through the high-voltage cable of the direct-current charging wire harness.

The present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs a method in any of the foregoing alternative implementations.

The storage medium may be implemented by any type of volatile or nonvolatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM), electrically erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.

The present application provides a computer program product which, when run on a computer, causes the computer to perform the method in any of the alternative implementations.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A vehicle-to-vehicle charging method, applied to a power supply vehicle, the method comprising:

transmitting a closing signal to a trolley bus through a low-voltage cable of a direct-current charging harness, so that the trolley bus closes a charging loop of the trolley bus according to the closing signal;

in response to receiving a feedback signal from the electric power receiving vehicle via the low voltage cable indicating that the charging loop of the electric power receiving vehicle is closed, the charging loop of the electric power supplying vehicle is closed to output a supply current to supply power to the electric power receiving vehicle via the high voltage cable of the direct current charging harness.

2. The vehicle-to-vehicle charging method according to claim 1, wherein the transmitting the closing signal to the electric receiver via the low-voltage cable of the direct-current charging harness comprises:

acquiring the current state of the power supply vehicle in response to receiving an energy supplementing signal sent by the power supply vehicle through the low-voltage cable;

transmitting a closing signal to a trolley bus through the low voltage cable when the current state is an energizable state;

3. The vehicle-to-vehicle charging method of claim 2, wherein the energy replenishment signal comprises battery pack information of the electric vehicle;

The sending of the closing signal to the trolley bus through the low voltage cable comprises:

and when the battery pack information of the electric power receiving vehicle is not abnormal, sending a closing signal to the electric power receiving vehicle through the low-voltage cable.

4. A vehicle-to-vehicle charging method according to any one of claims 1-3, wherein the closure signal comprises battery pack information of the power supply vehicle; the charging circuit of the electric power receiving vehicle is closed by the electric power receiving vehicle under the condition that the battery pack information of the electric power supplying vehicle is determined to be abnormal.

5. A vehicle-to-vehicle charging method according to any one of claims 1-3, wherein the supply current is determined from a present battery state of the power supply vehicle.

6. The vehicle-to-vehicle charging method of claim 5, further comprising:

disconnecting a charging loop of the power supply vehicle under the condition that the current battery state of the power supply vehicle meets a preset condition;

the preset condition comprises at least one of that the battery temperature of the power supply vehicle is larger than a preset temperature threshold value and the battery electric quantity of the power supply vehicle is smaller than a preset electric quantity threshold value.

7. A vehicle-to-vehicle charging method, characterized by being applied to a trolley bus, the method comprising:

Receiving a closing signal sent by a power supply vehicle through a low-voltage cable of a direct-current charging harness;

and closing the charging loop of the electric power car according to the closing signal, and feeding back a feedback signal indicating the closing of the charging loop of the electric power car to the power supply car through the low-voltage cable so as to receive the power supply current of the electric power car for charging after the power supply car closes the charging loop of the electric power car according to the feedback signal through the high-voltage cable of the direct-current charging wire harness.

8. The vehicle-to-vehicle charging method of claim 7, wherein the receiving the closure signal sent by the powered vehicle via the low voltage cable of the dc charging harness comprises:

transmitting an energy supplementing signal to the power supply vehicle through the low-voltage cable so as to receive the closing signal fed back by the power supply vehicle according to the energy supplementing signal when the power supply vehicle is in an energy-supplying state through the low-voltage cable;

9. The vehicle-to-vehicle charging method of claim 8, wherein the energy replenishment signal comprises battery pack information of the electric vehicle; the closing signal is generated by the power supply vehicle when it is determined that the battery pack information of the power receiving vehicle is not abnormal.

10. The vehicle-to-vehicle charging method according to any one of claims 7-9, wherein the closing signal includes battery pack information of the power supply vehicle;

and closing a charging loop of the trolley bus according to the closing signal, wherein the charging loop comprises:

and closing a charging loop of the electric power receiving vehicle when the battery pack information of the electric power supplying vehicle is not abnormal.

11. The vehicle-to-vehicle charging method according to any one of claims 7-9, characterized by further comprising:

and when the current state of the electric power receiving vehicle is an operation state, controlling the load operation of the electric power receiving vehicle according to the power supply current.

12. A vehicle-to-vehicle charging apparatus for use with a power supply vehicle, the apparatus comprising:

the signal sending module is used for sending a closing signal to the electric vehicle through a low-voltage cable of the direct-current charging harness so that the electric vehicle closes a charging loop of the electric vehicle according to the closing signal;

and the current output module is used for closing the charging loop of the power supply car to output a supply current through the high-voltage cable of the direct-current charging wire harness to supply power for the power supply car in response to receiving a feedback signal indicating that the charging loop of the power supply car is closed from the power supply car through the low-voltage cable.

13. A vehicle-to-vehicle charging apparatus for use with a power train, the apparatus comprising:

the signal receiving module is used for receiving a closing signal sent by the power supply vehicle through a low-voltage cable of the direct-current charging wire harness;

and the current input module is used for closing the charging loop of the electric power car according to the closing signal, feeding back a feedback signal indicating the closing of the charging loop of the electric power car to the power supply car through the low-voltage cable, and receiving the power supply current of the electric power car for charging after the power supply car closes the charging loop of the electric power car according to the feedback signal through the high-voltage cable of the direct-current charging wire harness.

14. An electronic device comprising a processor and a memory storing a computer program, characterized in that the processor implements any of claims 1 to 6 or implements the method of any of claims 7 to 11 when executing the computer program.

15. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the method of any one of claims 1 to 6 or any one of claims 7 to 11.

16. A vehicle charging system, characterized by comprising a power supply vehicle and a power receiving vehicle;

the power receiving car is connected with the power supply car through a direct-current charging wire harness;

the powered vehicle comprising a vehicle-to-vehicle charging device according to claim 12, and the electric power receiving vehicle comprising a vehicle-to-vehicle charging device according to claim 13.