Accompanying vehicle fast charging system and its control method

Abstract

This invention discloses a mobile charging system and its control method for on-the-go charging. The control method includes the following steps: a mobile power supply device is connected to an electric vehicle via a wiring harness; the mobile power supply device is unlocked and powered on, and the system starts; the mobile power supply device and the electric vehicle communicate via a handshake; the mobile power supply device obtains the battery state of charge (SOC) value of the electric vehicle; when the SOC value is less than a first threshold, the mobile power supply device charges the electric vehicle; when the SOC value is greater than a second threshold, the mobile power supply device stops charging the electric vehicle, wherein the first threshold is greater than the second threshold. This invention, by setting up a mobile power supply device, can fully charge the electric vehicle's battery while it is in motion. Once fully charged, the mobile power supply device can be removed from the vehicle, reducing energy consumption and charging waiting time; it also improves conversion efficiency. The system has a simple structure, high reliability, and is easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of electric vehicles, and in particular to a fast charging system for on-the-go charging and its control method. Background Technology

[0002] With the increasing popularity and rapid growth of electric vehicles (EVs), addressing range anxiety necessitates considering mobile charging solutions. Currently, EVs primarily utilize two charging methods: fast charging and battery swapping. However, existing fast charging methods require corresponding fast charging stations and charging piles, which are limited in number. Furthermore, current battery fast charging technology is immature and cannot meet the charging demands of EVs. Battery swapping, on the other hand, faces challenges in standardizing batteries across different vehicle models. Therefore, neither of these solutions effectively resolves range anxiety.

[0003] To address the anxiety of waiting for electric vehicle (EV) charging, current fast charging systems employ a towed power supply trailer—a trailer that moves alongside the EV and connects to charge it when needed. However, existing power supply trailers are complex, impractical, unreliable, and difficult to maintain. Furthermore, these systems require a charger or power adapter to power the entire EV, resulting in low power output, inefficient conversion, and complex charging protocols. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fast charging system and its control method that is accompanied by driving, with high conversion efficiency, simple structure, high reliability and convenient maintenance.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A fast charging system for on-the-go vehicles includes: a mobile power supply device and an electric vehicle, wherein the mobile power supply device is electrically connected to the electric vehicle;

[0007] The mobile power supply device includes a trailer battery pack, a power supply battery management system, and a current converter. The trailer battery pack is electrically connected to the power supply battery management system, and the power supply battery management system is electrically connected to the current converter.

[0008] The electric vehicle includes an electric management device, a power battery pack, and a vehicle controller. The current converter supplies power to the electric management device through a power receiving interface. The electric management device is electrically connected to the power battery pack and the vehicle controller.

[0009] In one embodiment, the accompanying fast charging system further includes a low-voltage electrical connector, a high-voltage electrical connector, and a mechanical connection structure. The low-voltage electrical connector is electrically connected to the mobile power supply device and the electric vehicle. The two ends of the high-voltage electrical connector are respectively electrically connected to the current converter and the power receiving interface. The mechanical connection structure is used to attach the mobile power supply device to the electric vehicle.

[0010] In one embodiment, the mobile power supply device further includes an OBD diagnostic interface, which is communicatively connected to the power supply battery management system.

[0011] In one embodiment, the mobile power supply device further includes a remote monitoring system, which is communicatively connected to the power supply battery management system.

[0012] In one embodiment, the mobile power supply device further includes a wireless charging module electrically connected to the power supply battery management system.

[0013] The present invention also provides a control method based on the above-described accompanying fast charging system, the control method comprising the following steps:

[0014] S100: The mobile power supply unit is connected to the electric vehicle via a wiring harness. When the mobile power supply unit is unlocked and powered on, the system starts.

[0015] S200. The mobile power supply device and the electric vehicle perform handshake communication. The mobile power supply device obtains the battery state of charge (SOC) value of the electric vehicle. When the battery SOC value is less than a first threshold, the mobile power supply device charges the electric vehicle.

[0016] S300. When the battery state of charge (SOC) value is greater than the second threshold, the mobile power supply device stops charging the electric vehicle, wherein the first threshold is greater than the second threshold.

[0017] In one embodiment, step S100 specifically includes:

[0018] S110. The mobile power supply device is connected to the electric vehicle via a cable, and it is determined whether there is a CC2 detection signal in the cable. If there is, the connection is successful.

[0019] S120. The mobile power supply device is connected to the electric vehicle through a mechanical connection structure, and the electric vehicle sends an interlock command to the mobile power supply device, and the mobile power supply device responds to and executes the interlock command.

[0020] S130. Scan the information tag on the mobile power supply device and send an unlock request command. The background receives and sends the unlock command, and the mobile power supply device responds to and executes the unlock command.

[0021] S140, The mobile power supply device closes the start button;

[0022] S150, the system is powered on and begins operation.

[0023] In one embodiment, the information label includes a QR code or a barcode.

[0024] In one embodiment, after step S100, a BMS self-test operation is further included, which specifically includes:

[0025] S101, The power supply battery management system of the mobile power supply device obtains a wake-up signal;

[0026] S102. The power supply battery management system is started and checks for serious fault information. If there is, step S103 is executed; otherwise, the mobile power supply device is started normally.

[0027] S103, The power supply battery management system reports a serious fault, and the mobile power supply device receives and displays the serious fault information.

[0028] In one embodiment, the handshake communication step between the mobile power supply device and the electric vehicle specifically includes:

[0029] S210. The mobile power supply device sends a rear vehicle handshake message to the electric vehicle. When the electric vehicle confirms that it has received the rear vehicle handshake message, the electric vehicle sends a BMS and vehicle handshake message.

[0030] S220. When the mobile power supply device obtains the handshake message from the BMS and the vehicle, the handshake communication is completed.

[0031] The advantages and beneficial effects of this invention compared to the prior art are as follows:

[0032] This invention relates to a mobile fast-charging system and its control method. By setting up a mobile power supply device, the battery of an electric vehicle can be fully charged while the vehicle is in motion. Once fully charged, the mobile power supply device can be disconnected from the vehicle, reducing energy consumption and charging waiting time. Furthermore, the communication and control of the electric vehicle are isolated from the mobile power supply device of the vehicle behind it, ensuring no impact on driving safety and stability. The electric vehicle only needs to add one power receiving interface; the high-voltage circuit remains unchanged to complete the system connection and assembly. Additionally, the mobile power supply device effectively improves conversion efficiency. The system has a simple structure, high reliability, and is convenient for users to maintain. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the accompanying fast charging system according to one embodiment of the present invention;

[0035] Figure 2 This is a functional principle diagram of a fast charging system for accompanying vehicles according to an embodiment of the present invention;

[0036] Figure 3 for Figure 2 The diagram shows the functional principle of an electric vehicle according to one embodiment.

[0037] Figure 4 for Figure 3 The diagram shows the functional principle of an electric vehicle according to one embodiment.

[0038] Figure 5 for Figure 3 A functional schematic diagram of an electric vehicle according to another embodiment is shown;

[0039] Figure 6 for Figure 2 The functional principle diagram of the electric vehicle according to the second embodiment is shown;

[0040] Figure 7 for Figure 2 The functional principle diagram of the electric vehicle according to the third embodiment shown;

[0041] Figure 8 for Figure 2 A functional schematic diagram of another embodiment of the accompanying fast charging system is shown.

[0042] Figure 9 This is a flowchart of a control method for a fast charging system accompanying vehicles according to an embodiment of the present invention. Detailed Implementation

[0043] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Unless otherwise defined, 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] Please see Figure 1 and Figure 2 A mobile fast-charging system for accompanying vehicles includes a mobile power supply device 10 and an electric vehicle 20, wherein the mobile power supply device 10 is electrically connected to the electric vehicle 20. It should be noted that the mobile power supply device 10 is used to supply power to the electric vehicle; the electric vehicle 20 is used to tow the mobile power supply device 10 behind it.

[0047] The mobile power supply device 10 serves as an energy supplement for electric vehicles, and its main function is to transfer energy to electric vehicles in a timely manner. At the same time, the energy flow of the mobile power supply device is unidirectional, which is beneficial to the stability and simplicity of the system.

[0048] Please see Figure 2In this embodiment, the accompanying fast charging system further includes a low-voltage electrical connector 30, a high-voltage electrical connector 40, and a mechanical connection structure 50. In this embodiment, the mechanical connection structure includes a contact sensor. The low-voltage electrical connector is electrically connected to the mobile power supply device and the electric vehicle. The two ends of the high-voltage electrical connector 40 are respectively electrically connected to the current converter of the mobile power supply device and the power receiving interface of the electric vehicle. The mechanical connection structure 50 is used to connect the mobile power supply device 10 to the electric vehicle 20. It should be noted that the low-voltage electrical connector 30 and the high-voltage electrical connector 40 are high- and low-voltage cables. Thus, the connection between the mobile power supply device and the electric vehicle's high- and low-voltage cables is mechanically connected in series with an interlocking contact sensor. The contact sensor is connected to the battery management system (BMS) of the mobile power supply device, which can determine whether it is connected to the electric vehicle. Simultaneously, interlocking is implemented in the control logic, resulting in better safety performance.

[0049] Please see Figure 2 The mobile power supply device 10 includes a trailer battery pack 100, a power supply battery management system 200, and a current converter 300. The trailer battery pack is electrically connected to the power supply battery management system, and the power supply battery management system is electrically connected to the current converter. It should be noted that the trailer battery pack 100 is used to supply power to the mobile power supply device and the electric vehicle; the power supply battery management system 200 is used to manage the trailer battery pack. The current converter 300 is used to output different voltages, and the actual voltage can be controlled by the power supply battery management system 200.

[0050] Please see Figure 2 The electric vehicle 20 includes an electric management device 400, a power battery pack 500, and a vehicle controller 600. The current converter 300 supplies power to the electric management device 400 via a power receiving interface 700. The electric management device 400 is electrically connected to the power battery pack 500 and the vehicle controller 600. It should be noted that the electric management device 400 manages the power input, output, and charging method of the entire vehicle; the power battery pack 500 provides power to the electric vehicle; and the vehicle controller 600 controls the overall operation of the vehicle during driving.

[0051] Thus, by incorporating a battery management system and current converter into the mobile power supply device, power can be directly supplied to the electric vehicle's management system. This results in a simpler system structure, higher reliability, and easier maintenance. Furthermore, the direct power supply simplifies the overall system control strategy, and the current converter allows for the provision of different voltages to the electric vehicle. The mobile power supply device provides a simple and reliable charging circuit for the electric vehicle, similar to a UPS bypass function. The high-voltage box does not require a dual-circuit circuit, and the vehicle controller does not need to be involved in control. It also offers good compatibility with electric vehicles, requiring minimal modifications to the vehicle.

[0052] It should also be noted that the current converter is a DC-DC current converter. The DC-DC current converter adjusts the power output according to the charging voltage and current power requirements of the electric vehicle to meet the driving and charging needs of the electric vehicle. In addition, the modular design of the system can be combined to increase or decrease the power.

[0053] Please see Figure 3 In one embodiment, the electric management device 400 includes a first battery management system 411 and a first combination controller 412. The first battery management system 411 is electrically connected to the power receiving interface 700, and the first battery management system 411 is electrically connected to the first combination controller 412. It should be noted that the first battery management system 411 is used to connect to the current converter 300 of the mobile power supply device through the power receiving interface, thereby allowing the voltage of the mobile power supply device to be directly connected to the first battery management system 411, and then output to the first combination controller 412 through the first battery management system 411; the first combination controller 412 is used to control the motor.

[0054] In one embodiment of this implementation, please refer to Figure 4 The first combined controller 412 includes a first high-voltage box 412a and a first motor controller 412b. The first high-voltage box is electrically connected to the first battery management system, and the first high-voltage box is electrically connected to the first motor controller. It should be noted that the first high-voltage box 412a and the first motor controller 412b are separate structures, which ensures the convenience of maintenance.

[0055] The trailer battery pack of the mobile power supply unit is connected to the electric vehicle's motor controller via a current converter, and the electric vehicle's battery pack is also connected to the electric vehicle's motor controller. Energy is distributed by a high-voltage box or a three-in-one motor controller; instead of a complex system that frequently switches the operation of the electric vehicle's battery and the mobile power supply unit's battery, the system can be made simpler and more reliable.

[0056] In another embodiment of this implementation, please refer to Figure 5 The first high-voltage box 412c and the first motor controller 412d are integrated. Furthermore, the first combined controller 412 can be a three-in-one controller, a four-in-one controller, or a multi-in-one controller, or it can be a separate structure of the high-voltage box and the motor controller, which can be selected according to the actual system design requirements.

[0057] Please see Figure 6 In the second embodiment, the electric management device 400 includes a second combined controller 421 and a second battery management system 422. The second combined controller 421 is electrically connected to the power receiving interface 700, and the second combined controller 421 is electrically connected to the second battery management system 422. Both the second battery management system 422 and the second combined controller 421 are electrically connected to the vehicle controller. In this embodiment, the second combined controller 421 is connected to the current converter 300 of the mobile power supply device. That is, the high voltage of the current converter 300 first passes through the second combined controller 421 and then enters the second battery management system 422, and finally enters the power battery pack 500 through the second battery management system 422. The second combined controller 421 can be a combined or separate controller, as in the two embodiments of the first embodiment, which will not be described in detail here.

[0058] Please see Figure 7 In the third embodiment, the electric vehicle management device 400 includes a second high-voltage box 431, a second motor controller 432, and a third battery management system 433. The second high-voltage box 431 is electrically connected to the power receiving interface 700, the third battery management system 433, and the second motor controller 432. Both the third battery management system 433 and the second motor controller 432 are electrically connected to the vehicle controller. In this embodiment, the second high-voltage box 431 is directly connected to the power receiving interface, allowing direct access to the high voltage of the current converter 300. The high voltage is then distributed to the second motor controller 432 and the third battery management system 433. Power is automatically allocated by the high-voltage box, with a portion driving the electric vehicle motor and a portion charging the electric vehicle battery. Therefore, by setting the high-voltage box to distribute voltage and power, the system's operating control strategy is simplified, further improving system reliability.

[0059] Furthermore, in terms of control logic, a portion of the power from the mobile power supply device is supplied to the electric motor of the electric vehicle, and a portion is supplied to the battery pack of the electric vehicle; the power from the mobile power supply device is transferred simultaneously through both channels, maximizing the release of the mobile power supply device's energy in the shortest possible time.

[0060] Please see Figure 8 The power supply battery management system 200 also includes a temperature sensor, a current sensor, a cell temperature detection module, and a voltage detection circuit, used to monitor the individual cells in the battery pack. The power supply battery management system 200 also includes a battery monitoring system, which is used to detect the insulation resistance, high-voltage interlock detection results, individual cell voltage, current, and temperature of the trailer power battery pack, as well as the total voltage, total current, and individual cell temperature of the power battery pack.

[0061] Please see Figure 2 and Figure 8 The mobile power supply device also includes an OBD diagnostic interface, which is communicatively connected to the power supply battery management system. This OBD diagnostic interface ensures convenient subsequent program upgrades and fault detection. Furthermore, the OBD diagnostic interface is used to connect to an on-board diagnostic system. This system continuously monitors the engine's operating status and the exhaust aftertreatment system's working status, and will immediately issue a warning if a fault is detected.

[0062] Please see Figure 2 and Figure 8 The mobile power supply device also includes a remote monitoring system, which is communicatively connected to the power supply battery management system. The remote monitoring system includes functions such as unlocking / wake-up, battery parameter monitoring, DC-DC parameter monitoring, location information, and OTA remote software upgrades.

[0063] Please see Figure 2 and Figure 8 The mobile power supply device also includes a wireless charging module, which is electrically connected to the power supply battery management system. It should be noted that the mobile power supply device supports not only conventional fast and slow charging, but also wireless charging. For DC fast charging, an external DC charging station directly charges the battery pack through a reserved DC charging interface. For slow charging, an external AC 220V mains power supply is connected to the AC / DC module circuit through a reserved AC charging interface to charge the battery pack. Wireless charging requires the use of a ground-based wireless charging induction coil for inductive charging.

[0064] The charging and discharging circuits of the mobile power supply device are isolated, thus ensuring charging safety. Specifically, the self-charging of the battery pack in the mobile power supply device is separate from the output of the current converter (the DC-DC current converter only outputs in one direction). Therefore, the charging and discharging systems of the mobile power supply device are completely isolated, ensuring its stability and safety.

[0065] Please see Figure 2The mobile power supply device 10 also includes a taillight, which is electrically connected to the taillight of the electric vehicle via a low-voltage cable and controlled by the vehicle controller of the electric vehicle to ensure the consistency between the taillight of the electric vehicle and the taillight of the mobile power supply device 10.

[0066] In addition, the power receiving interface of the electric vehicle has a 9-pin functional definition, which are defined as follows: 1. DC+, 2. C-, 3. PE, 4. A+, 5. A-, 6. S+, 7. S-, 8. CC1, and 9. CC2. The plug has a connection locking aviation connector, and the plug has CC1 to detect the PE resistance to ensure that the plug is plugged in properly. The DC / DC converter detects the plug position and interlocks the signal to control the high voltage power supply, thereby realizing the connection between the mobile power supply device 10 and the electric vehicle 20.

[0067] Please see Figure 9 The present invention also provides a control method based on the above-described accompanying fast charging system, the control method comprising the following steps:

[0068] Step S100: The mobile power supply device is connected to the electric vehicle via a wiring harness. The mobile power supply device is unlocked and powered on, and the system starts. It should be noted that the mobile power supply device is the rear-mounted device that follows the electric vehicle. The electric vehicle acts as the lead vehicle, towing the rear-mounted device for travel and movement, and the rear-mounted device can provide power to the electric vehicle during travel. Connecting the lead vehicle and the rear-mounted device via the wiring harness allows for a stable power supply to the electric vehicle. Furthermore, after connecting the wiring harness, the mobile power supply device needs to be scanned and unlocked, and / or switched on and off, thereby improving control over the mobile power supply and enhancing system reliability.

[0069] Step S200: The mobile power supply device and the electric vehicle establish a handshake communication. The mobile power supply device obtains the battery state of charge (SOC) value of the electric vehicle. When the SOC value is less than a first threshold, the mobile power supply device charges the electric vehicle. It should be noted that before the mobile power supply device charges the electric vehicle, the wiring harness must first be connected, and then the mobile power supply device and the electric vehicle must establish a handshake communication connection before power can be supplied to the electric vehicle in front.

[0070] Step S300: When the battery's State of Charge (SOC) value is greater than a second threshold, the mobile power supply device stops charging the electric vehicle, wherein the first threshold is greater than the second threshold. Further, after the preceding connection is completed, the power supply phase can begin. During this process, the mobile power supply device first needs to detect the SOC value in the electric vehicle's battery pack. When it is less than the first threshold, the electric vehicle needs to be charged; otherwise, charging is unnecessary. During charging, the battery pack's SOC value is also monitored in real time. When the battery pack's SOC value reaches the second threshold, power supply can be stopped. In this embodiment, the first threshold can be 75% to 85% of the overall battery pack's SOC, for example, 77%, 80%, or 83% of the overall SOC. The second threshold can be 90% to 98% of the battery pack's SOC, for example, 92%, 95%, or 97% of the overall SOC. Therefore, as long as the above conditions are met, charging or stopping charging can be performed, thus completing the power supply operation for the electric vehicle.

[0071] Thus, by setting up a mobile power supply device, the electric vehicle's battery can be fully charged while the vehicle is in motion. Once fully charged, the mobile power supply device can be removed from the vehicle behind the server, reducing energy consumption and charging time. Furthermore, the communication and control of the electric vehicle in this invention are isolated from the mobile power supply device of the vehicle behind the server, ensuring that driving safety and stability are not affected. Moreover, the electric vehicle only needs to add one power receiving interface, and the high-voltage circuit does not need to be changed to complete the system connection and assembly.

[0072] In one embodiment, step S100 specifically includes:

[0073] Step S110: The mobile power supply device is connected to the electric vehicle via a cable, and it is determined whether there is a CC2 detection signal in the cable. If there is, the connection is successful.

[0074] Step S120: The mobile power supply device is connected to the electric vehicle through a mechanical connection structure, and the electric vehicle sends an interlock command to the mobile power supply device, and the mobile power supply device responds to and executes the interlock command;

[0075] Step S130: Scan the information tag on the mobile power supply device and send an unlock request command. The background receives and sends the unlock command, and the mobile power supply device responds to and executes the unlock command.

[0076] Step S140: The mobile power supply device closes the start button;

[0077] Step S150: Power on the system and start working.

[0078] It should be noted that the system will only be powered on if steps S110 to S140 are met simultaneously. Furthermore, the order of steps S130 and S140 can be set according to actual needs; the order of the two steps is not limited here, only ensuring that the system can normally supply power to the electric vehicle while maintaining safety and reliability. In this embodiment, the information tag includes a QR code or barcode. This facilitates user connection and remote control.

[0079] In another embodiment, after step S100, a BMS self-test operation is further included, the BMS self-test operation specifically including:

[0080] Step S101: The power supply battery management system of the mobile power supply device obtains a wake-up signal;

[0081] Step S102: The power supply battery management system is started and checks for serious fault information. If there is, step S103 is executed; otherwise, the mobile power supply device is started normally.

[0082] Step S103: The power supply battery management system reports a serious fault, and the mobile power supply device receives and displays the serious fault information.

[0083] It should be noted that in step S102, minor, moderate, or severe faults in the system can also be detected. For minor faults, the fault is simply reported and displayed in the electric vehicle and system cloud service backend. For moderate faults, the fault is reported and displayed while simultaneously limiting the discharge power in real time until the fault is resolved. For severe faults, the fault is reported and displayed, and the BMS system is prohibited from high-voltage output until the fault is resolved. Thus, by setting up a BMS self-test step, the efficiency of self-testing can be effectively improved, enhancing the reliability and safety of the system.

[0084] In another embodiment, the handshake communication step between the mobile power supply device and the electric vehicle specifically includes:

[0085] S210. The mobile power supply device sends a rear vehicle handshake message to the electric vehicle. When the electric vehicle confirms that it has received the rear vehicle handshake message, the electric vehicle sends a BMS and vehicle handshake message.

[0086] S220. When the mobile power supply device obtains the handshake message from the BMS and the vehicle, the handshake communication is completed.

[0087] It should be further explained that the high-voltage box in the front vehicle has a built-in high-voltage circuit connected in parallel. It receives the power provided by the distribution device to meet the power requirements of the front vehicle's driving and other electrical appliances, and the remaining power is used to replenish the front vehicle's power battery.

[0088] The advantages and beneficial effects of this invention compared to the prior art are as follows:

[0089] This invention relates to a mobile fast-charging system and its control method. By setting up a mobile power supply device, the battery of an electric vehicle can be fully charged while the vehicle is in motion. Once fully charged, the mobile power supply device can be disconnected from the vehicle, reducing energy consumption and charging waiting time. Furthermore, the communication and control of the electric vehicle are isolated from the mobile power supply device of the vehicle behind it, ensuring no impact on driving safety and stability. The electric vehicle only needs to add one power receiving interface; the high-voltage circuit remains unchanged to complete the system connection and assembly. Additionally, the mobile power supply device effectively improves conversion efficiency. The system has a simple structure, high reliability, and is convenient for users to maintain.

[0090] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A fast charging system for on-the-go driving, characterized in that, include: A mobile power supply device and an electric vehicle, wherein the mobile power supply device is electrically connected to the electric vehicle; The mobile power supply device includes a trailer battery pack, a power supply battery management system, and a current converter. The trailer battery pack is electrically connected to the power supply battery management system, and the power supply battery management system is electrically connected to the current converter. The electric vehicle includes an electric management device, a power battery pack, and a vehicle controller. The current converter supplies power to the electric management device through a power receiving interface. The electric management device is electrically connected to the power battery pack and the vehicle controller. The accompanying fast charging system also includes a low-voltage electrical connector, a high-voltage electrical connector, and a mechanical connection structure. The low-voltage electrical connector is electrically connected to the mobile power supply device and the electric vehicle. The two ends of the high-voltage electrical connector are electrically connected to the current converter and the power receiving interface, respectively. The mechanical connection structure is used to attach the mobile power supply device to the electric vehicle. The mechanical connection structure includes a contact sensor; The mobile power supply device also includes an OBD diagnostic interface, which is communicatively connected to the power supply battery management system. The power supply battery management system also includes a battery monitoring system, which is used to detect the insulation resistance of the trailer power battery pack, the high voltage interlock test results, the voltage, current and temperature of individual cells, the total voltage and current of the power battery pack and the temperature of individual cells in the battery pack. The electric management device includes: a first combination controller and a first battery management system; Alternatively, a second combined controller and a second battery management system, wherein the second combined controller is an integrated three-in-one controller, four-in-one controller or multi-in-one controller; Alternatively, a second high-voltage box, a second motor controller, and a third battery management system; The first battery management system is electrically connected to the power receiving interface and is also electrically connected to the first combined controller. The first combined controller includes a first high-voltage box and a first motor controller. The first high-voltage box is electrically connected to the first battery management system and the first high-voltage box is also electrically connected to the first motor controller. The second combined controller is electrically connected to the power receiving interface, the second combined controller is electrically connected to the second battery management system, and both the second battery management system and the second combined controller are electrically connected to the vehicle controller. The second high-voltage box is electrically connected to the power receiving interface, the second high-voltage box is electrically connected to the third battery management system, the second high-voltage box is electrically connected to the second motor controller, and both the third battery management system and the second motor controller are electrically connected to the vehicle controller. A portion of the power from the mobile power supply device is supplied to the motor of the electric vehicle through the power supply battery management system, and a portion of the power is supplied to the battery pack of the electric vehicle through the power supply battery management system. The charging circuit and discharging circuit of the mobile power supply device are isolated; The battery pack of the mobile power supply device is self-charged, which is separate from the output of the current transformer of the mobile power supply device; The mobile power supply device is communicatively connected to the electric vehicle.

2. The accompanying fast charging system according to claim 1, characterized in that, The mobile power supply device also includes a remote monitoring system, which is communicatively connected to the power supply battery management system.

3. The accompanying fast charging system according to claim 2, characterized in that, The mobile power supply device also includes a wireless charging module, which is electrically connected to the power supply battery management system.

4. The control method for the accompanying fast charging system according to any one of claims 1 to 3, characterized in that, The control method includes the following steps: S100: The mobile power supply unit is connected to the electric vehicle via a wiring harness. When the mobile power supply unit is unlocked and powered on, the system starts. S200. The mobile power supply device and the electric vehicle perform handshake communication. The mobile power supply device obtains the battery state of charge (SOC) value of the electric vehicle. When the battery SOC value is less than a first threshold, the mobile power supply device charges the electric vehicle. S300. When the battery's state of charge (SOC) value is greater than a second threshold, the mobile power supply device stops charging the electric vehicle, wherein the first threshold is greater than the second threshold; the first threshold is 75% to 85% of the overall battery pack's SOC value, and the second threshold can be 90% to 98% of the vehicle's battery pack. Step S100 specifically includes: S110. The mobile power supply device is connected to the electric vehicle via a cable, and it is determined whether there is a CC2 detection signal in the cable. If there is, the connection is successful. S120. The mobile power supply device is connected to the electric vehicle through a mechanical connection structure, and the electric vehicle sends an interlock command to the mobile power supply device, and the mobile power supply device responds to and executes the interlock command. S130. Scan the information tag on the mobile power supply device and send an unlock request command. The background receives and sends the unlock command, and the mobile power supply device responds to and executes the unlock command. S140, The mobile power supply device closes the start button; S150, The system is powered on and begins operation; The handshake communication steps between the mobile power supply device and the electric vehicle specifically include: S210. The mobile power supply device sends a rear vehicle handshake message to the electric vehicle. When the electric vehicle confirms that it has received the rear vehicle handshake message, the electric vehicle sends a BMS and vehicle handshake message. S220. When the mobile power supply device obtains the handshake message from the BMS and the vehicle, the handshake communication is completed.

5. The control method for the accompanying fast charging system according to claim 4, characterized in that, The information label includes a QR code or a barcode.

6. The control method for the accompanying fast charging system according to claim 4, characterized in that, Following step S100, a BMS self-test operation is also included, which specifically includes: S101, The power supply battery management system of the mobile power supply device obtains a wake-up signal; S102. The power supply battery management system is started and checks for serious fault information. If there is, step S103 is executed; otherwise, the mobile power supply device is started normally. S103, The power supply battery management system reports a serious fault, and the mobile power supply device receives and displays the serious fault information.

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