Transport vehicle driving system and method and transport vehicle

Abstract

The invention relates to a transport vehicle driving system and method and a transport vehicle, the transport vehicle driving system comprises a transport vehicle and at least one energy storage device, the transport vehicle is used for transporting the energy storage device, and the transport vehicle comprises at least one power supply interface; the power supply interface is used for connecting the energy storage device to two ends of a power battery of the transport vehicle in parallel; the transport vehicle is used for receiving the voltage electric energy output by the energy storage device through the power supply interface according to the power supply requirement of the driving device so as to drive the driving device. The driving device of the transport vehicle can directly utilize the electric energy provided by the energy storage device to drive the transport vehicle, the endurance mileage of the transport vehicle can be effectively improved, and the storage of energy of the transport vehicle is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicles, and in particular, to a transport vehicle drive system, method, and transport vehicle. Background Art

[0002] Currently, when a new energy trailer is used to transport battery packs or new energy vehicles, due to the limited electric energy of the power battery of the new energy trailer itself, it is impossible to transport heavy goods over long distances and the cargo capacity is limited, which cannot meet the transportation requirements. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a transport vehicle drive system, method, and transport vehicle.

[0004] According to the first aspect of the embodiments of the present disclosure, the present disclosure provides a transport vehicle drive system, characterized in that the transport vehicle drive system includes a transport vehicle and an energy storage device, the transport vehicle is used to transport the energy storage device, the transport vehicle includes a power supply interface, and the power supply interface is used to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle;

[0005] The transport vehicle is used to receive the electric energy output by the energy storage device through the power supply interface according to the power supply demand of the drive device to drive the drive device.

[0006] Optionally, the transport vehicle further includes a communication interface corresponding to the power supply interface, and the communication interface is used for communication between a first battery management system and a second battery management system. The first battery management system is the battery management system of the power battery, and the second battery management system is the battery management system of the energy storage device;

[0007] The second battery management system is used to control the connection or disconnection of the corresponding energy storage device and the power supply interface.

[0008] Optionally, there are multiple energy storage devices;

[0009] The first battery management system is used to obtain first battery information through the communication interface, and the first battery information at least includes the voltage of each energy storage device;

[0010] The first battery management system is used to determine a target energy storage device according to the first battery information;

[0011] The transport vehicle is used to receive electric energy from the target energy storage device through the power supply interface according to the power supply demand of the drive device.

[0012] Optionally, the target energy storage device is an energy storage device whose voltage difference from the power battery is less than a first preset threshold;

[0013] The first battery management system is configured to send a power supply request to the second battery management system of the target energy storage device via the communication interface;

[0014] The second battery management system of the target energy storage device is configured to control the target energy storage device to output electric energy to the transport vehicle via the power supply interface in response to the power supply request. Optionally, the second battery management system is configured to control the target energy storage device to disconnect from the power supply interface in response to determining that the voltage difference between the corresponding energy storage device and the power battery is greater than or equal to the first preset threshold.

[0015] Optionally, the energy storage device includes a first DC / DC conversion device. The energy storage device is connected to the power supply interface via the first DC / DC conversion device, and the voltage output by the first DC / DC conversion device is different in different operating states;

[0016] The second battery management system is configured to control the operating state of the corresponding first DC / DC conversion device.

[0017] Optionally, there are multiple energy storage devices;

[0018] The first battery management system is configured to send a power supply request to the second battery management system of any energy storage device via the communication interface according to the power supply demand of the driving device;

[0019] The second battery management system of any energy storage device is configured to obtain the second battery information of the power battery via the communication interface in response to the power supply request. The second battery information includes at least the voltage of the power battery; and,

[0020] According to the power supply request and the voltage of the power battery, control the corresponding first DC / DC conversion device to convert the voltage output by any energy storage device into a target voltage, and output the target voltage to the transport vehicle via the power supply interface.

[0021] Optionally, the voltage difference between the target voltage and the voltage of the power battery is less than or equal to a second preset threshold.

[0022] Optionally, the transport vehicle further includes a second DC / DC conversion device, and the second DC / DC conversion device is configured to convert the voltage output by the power battery and / or the energy storage device to a required voltage to drive the driving device, and the required voltage is determined according to the power supply demand of the driving device.

[0023] Optionally, the energy storage device includes at least one of the following: a battery pack, a secondary battery, an electric vehicle, and an energy storage box.

[0024] Optionally, there are multiple energy storage devices, and at least two of the multiple energy storage devices have different voltages.

[0025] According to a second aspect of the embodiments of the present disclosure, the present disclosure provides a power supply method for a transport vehicle, which is applied to a transport vehicle for transporting energy storage devices. The transport vehicle includes a power supply interface for connecting the energy storage devices in parallel to both ends of the power battery of the transport vehicle.

[0026] The method includes:

[0027] According to the power supply demand of the driving device, receive the electric energy output by the energy storage device through the power supply interface to drive the driving device.

[0028] According to a third aspect of the embodiments of the present disclosure, the present disclosure provides a transport vehicle for transporting energy storage devices. The transport vehicle includes a power supply interface for connecting the energy storage devices in parallel to both ends of the power battery of the transport vehicle.

[0029] The power supply interface is used for the transport vehicle to receive the electric energy output by the energy storage device according to the power supply demand of the driving device to drive the driving device.

[0030] Through the above technical solutions, by setting the power supply interface, the energy storage devices transported by the transport vehicle can be connected in parallel to both ends of the power battery of the transport vehicle through the power supply interface. Furthermore, the driving device of the transport vehicle can directly utilize the electric energy provided by the energy storage device to drive the transport vehicle, effectively improving the cruising range of the transport vehicle and reducing the reserve of the self - contained energy of the transport vehicle.

[0031] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0032] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0033] Figure 1 is a schematic diagram of a transport vehicle drive system shown according to an exemplary embodiment.

[0034] Figure 2 is a schematic diagram of a transport vehicle drive system shown according to an exemplary embodiment.

[0035] Figure 3 is a schematic circuit diagram of an energy storage device shown according to an exemplary embodiment.

[0036] Figure 4It is a schematic circuit diagram of a transport vehicle drive system shown according to an exemplary embodiment.

[0037] Figure 5 It is another schematic circuit diagram of a transport vehicle drive system shown according to an exemplary embodiment.

[0038] Figure 6 It is a schematic diagram of a transport vehicle drive system network topology shown according to an embodiment of the present disclosure.

[0039] Figure 7 It is a flowchart of a power supply method for a transport vehicle shown according to an embodiment of the present disclosure.

[0040] Figure 8 It is a schematic diagram of a transport vehicle shown according to an embodiment of the present disclosure. Detailed Embodiments

[0041] The following will describe the detailed embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed embodiments described herein are only for explaining and illustrating the present disclosure, and are not used to limit the present disclosure.

[0042] Figure 1 It is a schematic diagram of a transport vehicle drive system shown according to an embodiment of the present disclosure. As Figure 1 shown, the transport vehicle drive system includes a transport vehicle 110 and an energy storage device 120. The transport vehicle 110 is used to transport the energy storage device 120. The transport vehicle 110 includes a power supply interface 111, and the power supply interface 111 is used to connect the energy storage device 120 in parallel to both ends of the power battery 112 of the transport vehicle 110;

[0043] The transport vehicle 110 is used to receive the electric energy output by the energy storage device 120 through the power supply interface 111 according to the power supply demand of the drive device 113 to drive the drive device 113.

[0044] Among them, the transport vehicle 110 can be used to transport one or more energy storage devices 120, and the transport vehicle 110 can be provided with a plurality of power supply interfaces 111. Furthermore, the transport vehicle 110 can be connected to a plurality of energy storage devices 120 respectively through the plurality of power supply interfaces 111. The embodiments of the present disclosure do not limit the number of the energy storage device 120 and the power supply interface 111.

[0045] In addition, the power supply interface 111 can be a DC interface. The energy storage device 120 can be connected to the power supply interface 111 through a cable and supply direct current to the transport vehicle 110 through the power supply interface 111.

[0046] Optionally, the voltages of at least two of the multiple energy storage devices 120 are different. Alternatively, the voltages of each of the multiple energy storage devices 120 are the same.

[0047] Optionally, the parts that the driving device 120 can drive are not limited to one, and can also include multiple driving and auxiliary loads such as air conditioners. For example, the driving device 130 can include three driving motors and an air conditioner motor, and these three driving motors can be respectively used to drive the front axle, the left rear wheel, and the right rear wheel.

[0048] In some alternative embodiments, the energy storage device 120 can include, for example, an electric vehicle, which can include a battery pack and a battery management system (BMS) deployed for managing the battery pack. Optionally, the energy storage device 120 can also include at least one of devices such as secondary batteries, battery packs, secondary batteries, and energy storage boxes. For example, the transport vehicle 110 can transport multiple electric vehicles and one or more battery packs.

[0049] Optionally, the transport vehicle 110 can be a tractor for transporting electric vehicles. The battery pack of the electric vehicle can be connected in parallel to the power battery 112 of the transport vehicle 110 through a cable using the power supply interface 111. Furthermore, the driving device 113 of the transport vehicle 110 can directly use the battery pack of the electric vehicle being transported to supply power to drive the transport vehicle 110, which can increase the cruising range of the transport vehicle 110.

[0050] In addition, the transport vehicle 110 can also be referred to as a tractor, a trailer, etc., and the present disclosure embodiment does not limit its name.

[0051] In the embodiments of the present disclosure, by providing a power supply interface, the energy storage device transported by the transport vehicle can be connected in parallel to both ends of the power battery of the transport vehicle through the power supply interface, so that the driving device of the transport vehicle can directly use the electric energy provided by the energy storage device to drive the transport vehicle, which can effectively increase the cruising range of the transport vehicle and reduce the reserve of the energy carried by the transport vehicle itself.

[0052] Figure 2 is a schematic diagram of a driving system of a transport vehicle shown according to an exemplary embodiment. As Figure 2 shown, E1 can be the power battery of the transport vehicle V0, and E2, E3, and E4 are respectively the battery packs of the electric vehicles V1 to V3, that is, the power batteries of the electric vehicles V1 to V3.

[0053] Among them, E2, E3, and E4 can be respectively connected in parallel to both ends of E1 through a power supply interface P1, a power supply interface P2, and a power supply interface P3 provided on the transport vehicle V0. Furthermore, the driving device M1 can use the electric energy stored in E2, E3, and E4 to drive the transport vehicle V0 to travel.

[0054] It should be noted that output interfaces can also be provided on the electric vehicles V1 to V3 and connected to the positive and negative electrodes of their battery packs respectively. Furthermore, the power supply interface of the transport vehicle V0 can be connected to the output interfaces of the electric vehicles through cables, so that the battery packs of the electric vehicles V1 to V3 can be connected in parallel to both ends of the power battery of the transport vehicle V0.

[0055] In addition, in Figure 2 the loads in the electric vehicles V1 to V3 can be the driving devices of the electric vehicles or any other devices, and the embodiments of the present disclosure do not limit this.

[0056] It can be understood that Figure 2 the shown circuit schematic diagram can be the circuit schematic diagram when the corresponding switches or contactors are in the closed state. The electric vehicles V1 to V2 and the transport vehicle V0 can control the states of the corresponding switches or contactors to disconnect some circuit connections, or to connect unconnected circuits.

[0057] In some possible embodiments, the transport vehicle can preferentially use the electric energy of the energy storage devices it transports to supply power to the driving device. For example, the transport vehicle can disconnect the connection with the energy storage device when it determines that the power of each energy storage device is lower than a preset threshold, and use its own power battery to supply power to the driving device.

[0058] In a possible scenario, the transport vehicle needs to transport electric vehicles from the factory to the 4S store and return to the factory empty after the transportation is completed. In this scenario, the transport vehicle can use the electric energy of the electric vehicles during the process of transporting the electric vehicles to the 4S store, and use the electric energy of its own power battery during the process of returning to the factory empty after the transportation is completed. During the whole process, if the electric energy of the electric vehicles transported by the transport vehicle can bear the transportation of the electric vehicles to the 4S store, then the transport vehicle does not need to be charged before returning to the factory, effectively improving the transportation efficiency.

[0059] In some alternative embodiments, the transport vehicle further includes a communication interface corresponding to the power supply interface. The communication interface is used for communication between the first battery management system and the second battery management system. The first battery management system is the battery management system of the power battery, and the second battery management system is the battery management system of the energy storage device; the second battery management system is used to control the connection or disconnection of the corresponding energy storage device and the power supply interface.

[0060] That is to say, the first battery management system and the second battery management system can form a communication link through a communication interface. Moreover, the communication link can be implemented by borrowing DC charging CAN communication or other forms. For example, the power supply interface and the communication interface provided on the transport vehicle can be the same interface. The communication link can be implemented by borrowing DC charging CAN communication or other forms. The energy storage device can be connected to this interface through a cable, so that the energy storage device can transmit electrical energy and communication data with the transport vehicle through this interface.

[0061] Among them, one or more communication interfaces can be provided on the transport vehicle. The communication interfaces and the power supply interfaces can correspond one by one. The transport vehicle can interact with multiple energy storage devices through multiple communication interfaces respectively. The number of communication interfaces is not limited in the embodiments of the present disclosure.

[0062] In one example, the energy storage device can include a switch, which can be called a charge and discharge contactor for example. This switch can be used to control the connection or disconnection between the energy storage device and the power supply interface. The second battery management system can control this switch to realize the control of the connection or disconnection between the energy storage device and the power supply interface. It can be understood that this switch can only be used to control the connection or disconnection between the energy storage device and the power supply interface and does not affect the communication interface.

[0063] In some other alternative embodiments, the first battery management system can also be used to control the connection or disconnection between each power supply interface and both ends of the power battery. For example, a switch can be provided between the cable of each power supply interface and both ends of the power battery. The first battery management system of the transport vehicle can determine to put one or more energy storage devices into power supply for the driving device according to the first battery information and / or the second battery information, and then can close the switch of the power supply interface of the corresponding energy storage device so that these energy storage devices can be connected in parallel to both ends of the power battery.

[0064] By adopting the above scheme, the battery management system of the transport vehicle and the battery management system of the energy storage device can realize information interaction through the communication interface, and then can control the power supply mode of the driving device according to the interaction information, effectively improving the reliability of the system.

[0065] In some embodiments, there are multiple energy storage devices;

[0066] The first battery management system is used to obtain first battery information through the communication interface, and the first battery information at least includes the voltage of each energy storage device;

[0067] The first battery management system is used to determine a target energy storage device according to the first battery information;

[0068] The transport vehicle is configured to receive electric energy from the target energy storage device through the power supply interface according to the power supply demand of the drive device.

[0069] Wherein, the target energy storage device can be an energy storage device selected by the first battery management system based on preset conditions. The preset conditions can be set based on safety performance or charging performance, and the embodiments of the present disclosure do not limit this.

[0070] Exemplarily, determining the target energy storage device based on preset conditions can be selecting any N energy storage devices from multiple energy storage devices according to the first battery information. Alternatively, it can also be N energy storage devices among multiple energy storage devices with the smallest voltage difference from the power battery. Or, it can also be an energy storage device with a voltage difference from the power battery less than a first preset threshold.

[0071] Adopting the above solution, the transport vehicle can select one or more energy storage devices that meet the preset conditions through the first battery management system, which can effectively ensure the reliability and safety of the energy storage device supplying power to the drive motor of the transport vehicle.

[0072] In some alternative embodiments, the target energy storage device is an energy storage device with a voltage difference from the power battery less than a first preset threshold;

[0073] The first battery management system is configured to send a power supply request to the second battery management system of the target energy storage device through the communication interface;

[0074] The second battery management system of the target energy storage device is configured to control the target energy storage device to output electric energy to the transport vehicle through the power supply interface in response to the power supply request.

[0075] It can be understood that the first battery information can also include the remaining power information, temperature information, etc. of each energy storage device, and the embodiments of the present disclosure do not limit this. In addition, the embodiments of the present disclosure do not limit the value of the first preset threshold either, which can be, for example, 10V or 50V, etc.

[0076] Wherein, the battery management system of the transport vehicle can interact with the battery management systems of each transported energy storage device. The battery management system of the transport vehicle can receive the voltage information sent by the battery management systems of each energy storage device. The battery management system of the transport vehicle compares the voltage difference between the voltage of each energy storage device and the power battery of the transport vehicle, and sends an input command to the battery management system of the energy storage device with a voltage difference less than the first preset threshold. After receiving the input command, the battery management system of the energy storage device can control the vehicle charging and discharging contactor to output the electric energy of the energy storage device to the transport vehicle bus, that is, to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle to supply power to the drive device.

[0077] Optionally, the first battery management system may continuously obtain the first battery information during the discharge process of the energy storage device, and determine whether to connect a new energy storage device to supply power to the driving device or disconnect the connection between the energy storage device currently supplying power to the driving device and the power supply interface according to the first preset threshold.

[0078] Optionally, the second battery management system is configured to control the target energy storage device to disconnect from the power supply interface in response to determining that the voltage difference between the corresponding energy storage device and the power battery is greater than or equal to the first preset threshold. In this way, the problem that an energy storage device with too large a voltage difference from the power battery of the transport vehicle is put into use, which may cause the transport vehicle to be unable to be reliably driven, can be effectively avoided.

[0079] With the above solution, the battery management system of the transport vehicle can obtain the battery information of each energy storage device through the communication interface, and then select an energy storage device with a voltage difference meeting the corresponding conditions to supply power to the driving device based on the voltage difference between the energy storage device and the power battery. It can realize the parallel use of an energy storage device with a smaller voltage difference and the power battery of the transport vehicle, and can also realize the parallel use of only energy storage devices with similar voltages, greatly improving the available power and endurance of the transport vehicle. It can be applied to scenarios where the voltage of the energy storage device is the same as or close to that of the battery pack of the transport vehicle, and also to scenarios where the voltage specifications of the energy storage devices are relatively consistent, which can make full use of the energy of the entire system and effectively improve the practicability of the system.

[0080] In some alternative embodiments, the energy storage device includes a first DC / DC conversion device. The energy storage device is connected to the power supply interface through the first DC / DC conversion device, and the voltage output by the first DC / DC conversion device is different in different working states; the second battery management system is configured to control the working state of the corresponding first DC / DC conversion device.

[0081] Figure 3 is a circuit schematic diagram of an energy storage device shown according to an exemplary embodiment, as Figure 3As shown, the energy storage device may include a battery pack En, a capacitor C1, a capacitor C2, a first switch K1, a second switch K2, and a third switch K3. The first DC / DC device D1 may include a first arm, a second arm, a first inductor L1, and a second inductor L2. The first arm includes a first switching tube G1 and a second switching tube G2, and the second arm includes a third switching tube G3 and a fourth switching tube G4. The first end of the first switching tube G1 is connected in series with the first end of the second switching tube G2, and the first end of the third switching tube G3 is connected in series with the first end of the fourth switching tube G4. The first end of the first switch K1 is connected to the positive electrode of the battery pack En, the second end of the first switch K1 is connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the series connection point of the first switching tube G1 and the second switching tube G2. The second end of the first switch K1 is also connected to the first end of the second inductor L2, and the second end of the second inductor L2 is connected to the series connection point of the third switching tube G3 and the fourth switching tube G4.

[0082] Among them, the second battery management system of the energy storage device can be used to control the working states of the first switching tube G1, the second switching tube G2, the second switching tube G3, and the fourth switching tube G4, and then adjust the output voltage of the energy storage device.

[0083] In addition, the second switch K2 and the third switch K3 can be used to disconnect or close in response to the control signal of the second battery management system of the energy storage device, so as to realize the control of disconnecting or connecting the energy storage device and the power supply interface.

[0084] In some examples, Figure 3 The energy storage device shown can be a part of an electric vehicle, and the electric vehicle can also include a driving device, a vehicle frame, a battery management system, etc. It can be understood that Figure 3 Only some devices in the energy storage device are shown, and the energy storage device can also include other components to achieve other necessary functions, which are not limited in the embodiments of the present disclosure.

[0085] By adopting the above solution, a first DC / DC conversion device can be set in the energy storage device, and then the voltage value output by the energy storage device can be adjusted, which can further improve the compatibility and reliability of the system.

[0086] In some optional embodiments, the first battery management system is configured to send a power supply request to the second battery management system of any energy storage device through the communication interface according to the power supply demand of the driving device;

[0087] The second battery management system of any energy storage device is configured to obtain the second battery information of the power battery through the communication interface in response to the power supply request, and the second battery information at least includes the voltage of the power battery; and,

[0088] According to the power supply request and the voltage of the power battery, control the corresponding first DC / DC conversion device to convert the voltage output by any of the energy storage devices into a target voltage, and output the target voltage to the transport vehicle through the power supply interface.

[0089] Among them, the first battery management system can randomly send a power supply request to one or more energy storage devices, that is, the number of any of the above energy storage devices can be one or more. Optionally, the first battery management system can send a power supply request to any N energy storage devices according to the power supply demand, and N can be determined according to the power supply demand.

[0090] Among them, the first battery management system can perform network interaction with the second battery management system of each energy storage device, and the second battery management system of each energy storage device can control the corresponding first DC / DC conversion device. The second battery management system can use the first DC / DC conversion device to control the battery of the corresponding energy storage device to be stepped down to the target voltage and output it to the transport vehicle.

[0091] In some other possible embodiments, the power supply request may include the second battery information of the power battery of the transport vehicle. The energy storage device may not need to obtain the second battery information through the communication interface, and directly determine the target voltage according to the information in the power supply request.

[0092] Optionally, the power supply request may further include the target voltage. The energy storage device may determine the target voltage according to the power supply request, control the first DC / DC conversion device, so that the energy storage device outputs the corresponding target voltage to drive the transport vehicle.

[0093] In some optional embodiments, the voltage difference between the target voltage and the voltage of the power battery is less than or equal to a second preset threshold. Optionally, the target voltage may be equal to the voltage of the power battery of the transport vehicle, that is, the second preset threshold may be zero. Among them, the second preset threshold may also be a preset value, for example, it may be 0 or 10V, etc. The embodiments of the present disclosure do not limit this.

[0094] Adopting the above solution, the transport vehicle can send a power supply request to the energy storage device through the first battery management system, so that the energy storage device adjusts the working state of the first DC / DC conversion device according to the power supply request and / or the voltage of the power battery of the transport vehicle, so that the energy storage device can output the corresponding target voltage, which can effectively schedule the system and effectively ensure the reliability of the drive of the transport vehicle.

[0095] The above solution can achieve the simultaneous output of multiple energy storage devices to the transport vehicle, greatly improving the power and endurance of the transport vehicle. This solution can be applied to scenarios with a relatively high voltage platform of the energy storage device, enabling the mixed installation and simultaneous use of multiple high-voltage platform energy storage devices, and greatly improving the practicality of the system.

[0096] In the above embodiment, the transport vehicle further includes a second DC / DC conversion device, which is used to convert the voltage output by the power battery and / or the energy storage device to the required voltage to drive the driving device, and the required voltage is determined according to the power supply requirement of the driving device.

[0097] By adopting the above solution, by setting a second DC / DC conversion device in the transport vehicle, the transport vehicle can further convert the voltage output by the power battery and / or the energy storage device to the voltage required by the driving device, which can further ensure the stability and reliability of the system in driving the transport vehicle.

[0098] To enable those skilled in the art to better understand the technical solutions provided by the embodiments of the present disclosure, the present disclosure also provides Figure 4 and Figure 5 the circuit schematic diagrams of the transport vehicle drive systems in two different scenarios as shown.

[0099] Figure 4 FIG. is a circuit schematic diagram of a transport vehicle drive system shown according to an exemplary embodiment. In the embodiments of the present disclosure, the energy storage devices transported by the transport vehicle can be electric vehicles, and the voltage platforms of the battery packs of each electric vehicle can be different or the same. As Figure 4 shown, the system includes a transport vehicle V10 and electric vehicles V11 to V13. E12, E13, and E14 are the battery packs of electric vehicles V11 to V13 respectively, that is, the power batteries of electric vehicles V11 to V13. First DC / DC conversion devices D1 are respectively provided in electric vehicles V11 to V13 and are respectively connected in parallel to both ends of the power battery E11 of the transport vehicle V10.

[0100] Optionally, the transport vehicle V10 can be provided with multiple power supply interfaces, and each of the electric vehicles V11 to V13 can be provided with a corresponding output interface. When a cable is connected to the output interface of the electric vehicle and the other end of the cable is connected to any one of the power supply interfaces of the transport vehicle V10, the battery pack of the electric vehicle can be connected in parallel to the power battery E11 of the transport vehicle V10.

[0101] Further, referring to Figure 4, the transport vehicle V10 includes the above-mentioned power battery E11, as well as a second DC / DC conversion device D2, an inverter module M101 and a drive motor M102. Among them, the inverter module M101 and the drive motor M102 can be combined into a drive device of the transport vehicle V10. The inverter module M101 can convert the direct current output by at least one of the power battery E1, battery pack E2, battery pack E3, and battery pack E4 into alternating current for the drive motor M102 to drive the transport vehicle V10.

[0102] It can be understood that the drive motor M102 of the transport vehicle V10 can be a multi-phase motor, such as a three-phase motor, a five-phase motor, etc. Correspondingly, the inverter module M101 can be set as the corresponding inverter module of the drive motor M102. The present disclosure does not limit this. As Figure 4 shown, in this embodiment, taking the drive motor M102 as a three-phase motor as an example, for the corresponding inverter module M101 of the three-phase motor, reference can be made to the related art, and the present disclosure will not elaborate on this.

[0103] It can be understood that Figure 4 the optional implementation manners of the first DC / DC conversion device D1 in each electric vehicle can be referred to Figure 3 the corresponding descriptions therein, and the present disclosure will not elaborate on this. It should be noted that the components of the first DC / DC conversion device D1 provided in each electric vehicle or each energy storage device can have the same parameters or different parameters. The present disclosure does not limit this.

[0104] In addition, the structures of the first DC / DC conversion device D1 and the second DC / DC conversion device D2 can be the same, and only the parameters of the components therein can be different. Therefore, the optional implementation manners of the second DC / DC conversion device D2 can be referred to Figure 3 the corresponding descriptions of the first DC / DC conversion device D1 therein, and the present disclosure will not elaborate on this.

[0105] Those skilled in the art should understand that Figure 4 also shows some components such as switches, resistors, and capacitors required to implement the corresponding functions in the transport vehicle V10 and the electric vehicles V11 to V13. These components can be replaced or removed, and the present disclosure will not describe this in detail. And, in some optional embodiments, during the operation of the drive motor, the second DC / DC conversion device D2 in the transport vehicle V10 can be omitted or replaced.

[0106] Refer to Figure 4The shown transport vehicle drive system is such that the battery of the electric vehicle transported by the transport vehicle V10 can output direct current with adjustable voltage through the first DC / DC conversion device. The transport vehicle can include multiple inputs and can be connected to the electric vehicle being transported to input electrical energy. The transport vehicle includes a power battery that can be switched on and off through a contactor. That is to say, the battery management system of the transport vehicle can control the corresponding switch, thereby enabling the power battery to supply electrical energy to the drive motor, or enabling the power battery not to supply electrical energy to the drive motor.

[0107] In this embodiment, the BMS of the transport vehicle can perform network interaction with the BMS of each transported vehicle (i.e., electric vehicles V1 to V3), and each transported vehicle BMS can perform network interaction with the first DC / DC conversion device installed on it.

[0108] Optionally, the BMS of the transport vehicle can send the target voltage (for example, the voltage of the power battery of the transport vehicle) to the BMS of each transported vehicle. The transported vehicle sends the target voltage to the corresponding first DC / DC converter, and the first DC / DC converter controls to step down the battery of the transported vehicle to the target voltage and output it to the transport vehicle.

[0109] In this embodiment, the electrical energy of the power battery of the transported vehicle can be output to the transport vehicle by using the first DC / DC converter of the transported vehicle; and through the network interaction between the BMS of the transport vehicle and the BMS of the transported vehicle, after receiving the target voltage sent by the BMS of the transport vehicle, the BMS of the transported vehicle sends this requirement to the first DC / DC conversion device installed in the transported vehicle to output direct current with the target voltage to the transport vehicle; this solution can achieve multiple transported vehicles outputting electrical energy to the transport vehicle simultaneously, greatly improving the power and endurance of the transport vehicle. This embodiment can be applicable to the situation where the battery voltage platform of the transported vehicle is relatively high, and it can realize the mixed loading and simultaneous use of multiple transported vehicles with high voltage platforms, greatly improving the practicality of the system.

[0110] Figure 5 It is another circuit schematic diagram of a transport vehicle drive system shown according to an exemplary embodiment. In the embodiments of the present disclosure, the energy storage devices transported by the transport vehicle can include multiple of electric vehicles, battery packs, energy storage boxes, etc. The voltage of each energy storage device can be relatively similar. For example, it can be multiple electric vehicles with the same signal, or battery packs with the same voltage, such as Figure 5As shown, the system includes a transport vehicle V20 and energy storage devices 1201 to 1203. Each energy storage device includes a DC power source, namely DC power sources E5 to E7. Each energy storage device may also include a load, such as loads F1 to F3. Among them, the types of each load may be the same or different. For example, if the energy storage device 1204 is an electric vehicle, the corresponding load F3 may be the drive device of the electric vehicle. Or, if the energy storage device 1201 is a battery pack, the load F1 may be a resistor for avoiding short circuit. The embodiments of the present disclosure do not limit the type of the load in the energy storage device.

[0111] Optionally, the transport vehicle V20 may be provided with a plurality of power supply interfaces, and an output interface may be respectively provided on each of the energy storage devices 1201 to 1203. When a cable is connected to the output interface of the energy storage device and the other end of the cable is connected to any one of the power supply interfaces of the transport vehicle V20, the battery pack of the electric vehicle can be connected in parallel to the power battery E21 of the transport vehicle V20.

[0112] Furthermore, the transport vehicle V20 may include a power battery E1, an inverter module M101, and a drive motor M102. The optional implementation manners of the inverter module M101 and the drive motor M102 can be referred to Figure 3 the corresponding descriptions, which will not be elaborated here.

[0113] Those skilled in the art should understand that Figure 5 also shows some components such as switches, resistors, capacitors, etc. required to implement corresponding functions in the transport vehicle V20 and the energy storage devices 1201 to 1203. These components can be replaced or removed, and the embodiments of the present disclosure do not describe them in detail. And, in some optional embodiments, a second DC / DC conversion device may also be provided in the transport vehicle V20.

[0114] Referring to Figure 5 the shown transport vehicle drive system, the energy storage device in this solution can output direct current to the transport vehicle. The transport vehicle may include multiple inputs and can be connected to the energy storage device to input electrical energy.

[0115] In this embodiment, the transport vehicle BMS can perform network interaction with the BMS of each energy storage device. The transport vehicle BMS can receive the battery voltage sent by the BMS of each energy storage device. The transport vehicle BMS can send an input command to the BMS of the energy storage device with a pressure difference less than U0 by comparing the pressure differences between the battery voltages of each energy storage device and the battery voltage of the transport vehicle. After receiving the input command, the BMS of the energy storage device controls the corresponding charge and discharge contactor to output the electrical energy of the battery pack to the transport vehicle busbar, that is, to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle. And continuously judge the pressure difference during the discharge process, and input the battery pack when the conditions are met to ensure that enough energy storage device battery packs can be put into use.

[0116] In this embodiment, communication can be carried out between the transport vehicle BMS and the energy storage device BMS to compare the pressure differences of the battery packs. By controlling the corresponding circuit to close through the BMS, it is possible to put the energy storage device with a smaller pressure difference into parallel use with the battery pack of the transport vehicle, and it is also possible to put only the energy storage devices with similar voltages into parallel use, greatly improving the available power and endurance of the transport vehicle. This embodiment can be applied to scenarios where the voltage of the energy storage device is the same as or close to that of the battery pack of the transport vehicle, and also to scenarios where the voltage specifications of the energy storage devices are relatively consistent. This solution makes full use of the energy of the entire system and effectively improves the practicality of the system.

[0117] On the other hand, Figure 6 FIG. is a schematic diagram of a network topology of a transport vehicle drive system according to an embodiment of the present disclosure. As Figure 6 shown, the first battery management system may be the battery management system of the transport vehicle. The first battery management system of the transport vehicle may be connected to the second battery management systems of one or more energy storage devices through one or more communication interfaces provided on the transport vehicle, so that the first battery management system can respectively interact with multiple second battery management systems. The second battery management system can control the corresponding first DC / DC conversion device according to the information obtained through the interaction or the information collected by itself, so that the corresponding energy storage device outputs the voltage required by the drive device of the transport vehicle.

[0118] According to another aspect of the embodiments of the present disclosure, the embodiments of the present disclosure also provide a method for supplying power to a transport vehicle. Figure 7 FIG. is a flowchart of a method for supplying power to a transport vehicle according to an embodiment of the present disclosure. This method can be applied to the transport vehicle in the transport vehicle power supply system, such as the transport vehicle 110, transport vehicle V0, transport vehicle V10, and transport vehicle V20 in the above embodiments. As Figure 7 shown, this method includes:

[0119] Step S701, according to the power supply demand of the drive device, receive the electric energy output by the energy storage device through the power supply interface to drive the drive device.

[0120] In some embodiments, the transport vehicle is used to transport the energy storage device. The transport vehicle includes a power supply interface, and the power supply interface is used to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle.

[0121] In some embodiments, the transport vehicle further includes a communication interface corresponding to the power supply interface. The communication interface is used for communication between the first battery management system and the second battery management system. The first battery management system is the battery management system of the power battery, and the second battery management system is the battery management system of the energy storage device. The second battery management system is used to control the connection or disconnection of the corresponding energy storage device to the power supply interface.

[0122] Optionally, there are multiple energy storage devices. The method includes: using the first battery management system to obtain first battery information through the communication interface, where the first battery information at least includes the voltage of each energy storage device; using the first battery management system to determine a target energy storage device based on the first battery information; and receiving electric energy from the target energy storage device through the power supply interface according to the power supply demand of the driving device.

[0123] Optionally, the target energy storage device is an energy storage device with a voltage difference from the power battery less than a first preset threshold. The method includes: using the first battery management system to send a power supply request to the second battery management system of the target energy storage device through the communication interface.

[0124] The second battery management system of the target energy storage device is used to control the target energy storage device to output electric energy to the transport vehicle through the power supply interface in response to the power supply request.

[0125] Optionally, the second battery management system is used to control the target energy storage device to disconnect from the power supply interface in response to determining that the voltage difference between the corresponding energy storage device and the power battery is greater than or equal to the first preset threshold.

[0126] Optionally, the energy storage device includes a first DC / DC conversion device. The energy storage device is connected to the power supply interface through the first DC / DC conversion device, and the voltage output by the first DC / DC conversion device is different in different working states. The second battery management system is used to control the working state of the corresponding first DC / DC conversion device.

[0127] Optionally, there are multiple energy storage devices. The method includes: using the first battery management system to send a power supply request to the second battery management system of any energy storage device through the communication interface according to the power supply demand of the driving device.

[0128] The second battery management system of any of the energy storage devices is configured to obtain second battery information of the power battery through the communication interface in response to the power supply request, where the second battery information at least includes the voltage of the power battery; and, based on the power supply request and the voltage of the power battery, control the corresponding first DC / DC conversion device to convert the voltage output by any of the energy storage devices into a target voltage, and output the target voltage to the transport vehicle through the power supply interface.

[0129] Optionally, the voltage difference between the target voltage and the voltage of the power battery is less than or equal to a second preset threshold.

[0130] Optionally, the transport vehicle further includes a second DC / DC conversion device configured to convert the voltage output by the power battery and / or the energy storage device to a required voltage to drive the driving device, where the required voltage is determined according to the power supply requirement of the driving device.

[0131] Optionally, the energy storage device includes at least one of the following: a battery pack, a secondary battery, an electric vehicle, and an energy storage box.

[0132] Optionally, there are multiple energy storage devices, and at least two of the multiple energy storage devices have different voltages.

[0133] According to another aspect of the embodiments of the present disclosure, there is also provided a transport vehicle. Figure 8 It is a schematic diagram of a transport vehicle shown according to the embodiments of the present disclosure. As Figure 8 shown, the transport vehicle 80 includes a power supply interface 81 configured to connect the energy storage device in parallel to both ends of the power battery 72 of the transport vehicle.

[0134] The power supply interface 81 is configured to receive electrical energy output by the energy storage device to drive the driving device 83 according to the power supply requirement of the driving device 83 for the transport vehicle.

[0135] In some embodiments, the transport vehicle 80 may be provided as the transport vehicle 110, transport vehicle V0, transport vehicle V10, or transport vehicle V20 in the above embodiments.

[0136] In the implementation of the present disclosure, the optional implementation manners of the transport vehicle 80 may refer to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6 the corresponding optional implementation manners and their associated parts therein, and the embodiments of the present disclosure will not elaborate on this.

[0137] In yet another aspect, embodiments of the present disclosure further provide an energy storage device. The energy storage device may include a DC power source and an output interface. The output interface can be connected to the functional interface of the transport vehicle through a cable, so that the DC power source of the energy storage device is connected in parallel to both ends of the power battery of the transport vehicle to supply power to the transport vehicle. The energy storage device may be provided as the Figure 1 energy storage device 120 in the above embodiments, Figure 2 electric vehicles V1 to V3 in the above embodiments, Figure 3 energy storage device in the above embodiments, Figure 4 electric vehicles V11 to electric vehicles V13 in the above embodiments, Figure 5 at least one of the energy storage devices 1201 to 1203 in the above embodiments.

[0138] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0139] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0140] Furthermore, any combination can be made between different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A transport vehicle drive system, characterized in that, the transport vehicle drive system includes a transport vehicle and an energy storage device, the transport vehicle is used to transport the energy storage device, the transport vehicle includes a power supply interface, and the power supply interface is used to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle; the transport vehicle is used to receive the electric energy output by the energy storage device through the power supply interface according to the power supply demand of the drive device to drive the drive device.

2. The system according to claim 1, characterized in that, the transport vehicle further includes a communication interface corresponding to the power supply interface, and the communication interface is used for communication between a first battery management system and a second battery management system. The first battery management system is the battery management system of the power battery, and the second battery management system is the battery management system of the energy storage device; the second battery management system is used to control the connection or disconnection of the corresponding energy storage device and the power supply interface.

3. The system according to claim 2, characterized in that, there are multiple energy storage devices; the first battery management system is used to obtain first battery information through the communication interface, and the first battery information at least includes the voltage of each energy storage device; the first battery management system is used to determine a target energy storage device according to the first battery information; the transport vehicle is used to receive electric energy from the target energy storage device through the power supply interface according to the power supply demand of the drive device.

4. The method according to claim 3, characterized in that, the target energy storage device is an energy storage device whose voltage difference from the power battery is less than a first preset threshold; the first battery management system is used to send a power supply request to the second battery management system of the target energy storage device through the communication interface; the second battery management system of the target energy storage device is used to control the target energy storage device to output electric energy to the transport vehicle through the power supply interface in response to the power supply request.

5. The system according to any one of claims 2-4, characterized in that, the second battery management system is used to control the target energy storage device to disconnect from the power supply interface in response to determining that the voltage difference between the voltage of the corresponding energy storage device and the voltage of the power battery is greater than or equal to the first preset threshold.

6. The method according to any one of claims 2-4, characterized in that, the energy storage device includes a first DC / DC conversion device, and the energy storage device is connected to the power supply interface through the first DC / DC conversion device, and the voltage output by the first DC / DC conversion device is different in different working states; the second battery management system is used to control the working state of the corresponding first DC / DC conversion device.

7. The system according to claim 6, characterized in that, there are multiple energy storage devices; the first battery management system is used to send a power supply request to the second battery management system of any energy storage device through the communication interface according to the power supply demand of the drive device. The second battery management system of any of the energy storage devices is configured to obtain second battery information of the power battery through the communication interface in response to the power supply request, where the second battery information at least includes the voltage of the power battery; And, According to the power supply request and the voltage of the power battery, control the corresponding first DC / DC conversion device to convert the voltage output by any of the energy storage devices into a target voltage, and output the target voltage to the transport vehicle through the power supply interface.

8. The system according to claim 7, wherein, The voltage difference between the target voltage and the voltage of the power battery is less than or equal to a second preset threshold.

9. The system according to any one of claims 1-4, wherein, The transport vehicle further includes a second DC / DC conversion device, which is configured to convert the voltage output by the power battery and / or the energy storage device to a required voltage to drive the driving device, and the required voltage is determined according to the power supply requirement of the driving device.

10. The system according to any one of claims 1-4, wherein, The energy storage device includes at least one of the following: a battery pack, a secondary battery, an electric vehicle, and an energy storage box.

11. The system according to any one of claims 1-4, wherein, There are multiple energy storage devices, and at least two of the multiple energy storage devices have different voltages.

12. A power supply method for a transport vehicle, wherein, Applied to a transport vehicle, the transport vehicle is used to transport an energy storage device, and the transport vehicle includes a power supply interface, and the power supply interface is used to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle; The method includes: According to the power supply requirement of the driving device, receive the electric energy output by the energy storage device through the power supply interface to drive the driving device.

13. A transport vehicle, wherein, The transport vehicle is used to transport an energy storage device, and the transport vehicle includes a power supply interface, and the power supply interface is used to connect the energy storage device in parallel to both ends of the power battery of the transport vehicle; The power supply interface is used for the transport vehicle to receive the electric energy output by the energy storage device according to the power supply requirement of the driving device to drive the driving device.

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