Distribution box for vehicle discharge

Abstract

The embodiment of the invention provides a distribution box for vehicle discharge. The distribution box comprises a controller and at least two first switch units, the first end of each first switch unit is connected with a power transmission interface of the vehicle, and the second end of each first switch unit is connected with the corresponding charging interface; and the controller is connected with the at least two first switch units, the power transmission interface and each charging interface, and is used for controlling the first switch unit corresponding to the at least one charging interface to be closed when acquiring that the connection state of the power distribution box and the power transmission interface is connection and the connection state of the power distribution box and the at least one charging interface is connection. The distribution box is used for achieving the purpose that a vehicle charges a plurality of external battery blocks at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a power distribution box for discharging a vehicle. BACKGROUND

[0002] With the rapid development of low-altitude economy, unmanned aerial vehicles (UAVs) are increasingly widely used in fields such as agricultural and forestry plant protection, logistics hoisting, and emergency rescue. These application scenarios have very high requirements for the endurance and work efficiency of UAVs.

[0003] Therefore, how to provide efficient and continuous charging solutions for multiple battery blocks of a UAV through a direct current (DC) fast charging interface (Vehicle to Load, V2L) of a new energy vehicle has become a key technical requirement for improving work efficiency. SUMMARY

[0004] The power distribution box for discharging a vehicle provided by the embodiments of the present application is used to achieve the purpose of charging multiple external battery blocks simultaneously by a vehicle.

[0005] In a first aspect, the embodiments of the present application provide a power distribution box for discharging a vehicle, comprising: a controller and at least two first switch units;

[0006] The first end of each first switch unit is connected with a power transmission interface of the vehicle, and the second end of each first switch unit is connected with a corresponding charging interface.

[0007] The controller is connected with the at least two first switch units, the power transmission interface, and each charging interface, and is configured to control a first switch unit corresponding to at least one charging interface to be closed when it is obtained that the connection state of the power distribution box and the power transmission interface is connected and the connection state of the power distribution box and the at least one charging interface is connected.

[0008] In one or more embodiments, the power distribution box further comprises a power supply unit and a second switch unit.

[0009] The controller is connected with the second switch unit, and is configured to control the second switch unit and an electronic lock of the power transmission interface to be closed when it is obtained that the connection state of the power distribution box and the power transmission interface is connected and the connection state of the power distribution box and the at least one charging interface is connected.

[0010] The power supply unit is connected with a battery management system (BMS) of the vehicle and chargers corresponding to the at least two charging interfaces through the second switch unit, and is configured to supply low-voltage power to the BMS and the corresponding chargers.

[0011] In one or more embodiments, further comprising a direct current to direct current (DC / DC) unit;

[0012] The DC / DC unit is connected with the power transmission interface and the power supply unit respectively, and is configured to transmit the electric energy of the battery in the vehicle to the power supply unit through the power transmission interface.

[0013] In one or more embodiments, each first switch unit comprises a first switch, a second switch, and a first resistor;

[0014] For each first switch unit, the first switch is connected with the power transmission interface and the charging interface respectively, and the second switch and the first resistor are connected with the power transmission interface and the charging interface respectively;

[0015] The controller is configured to close the second switch to enable the power transmission interface to perform a pre-charging operation of high-voltage transmission on the corresponding charging interface;

[0016] The controller is further configured to close the first switch and open the second switch after the pre-charging operation is completed, so as to enable the power transmission interface to perform a charging operation of high-voltage transmission on the corresponding charging interface.

[0017] In one or more embodiments, each first switch unit further comprises a fuse;

[0018] The fuse is arranged between the power transmission interface and the first switch, and is configured to be fused when a current value corresponding to the charging operation is greater than a fuse current value of the fuse.

[0019] In one or more embodiments, the controller is connected with the BMS respectively;

[0020] The controller is configured to initiate a first handshake process to the BMS;

[0021] The controller is further configured to exchange discharge configuration parameter information with the BMS after the first handshake process is successful, so as to close a third switch between the battery of the vehicle and the power transmission interface when the BMS enters a discharge ready state;

[0022] In one or more embodiments, the controller is connected with the chargers corresponding to the at least two charging interfaces respectively;

[0023] The controller is configured to initiate a second handshake process to the chargers corresponding to the at least one charging interface;

[0024] The controller is further configured to exchange discharging configuration parameter information with the charger corresponding to the at least one charging interface after the second handshake procedure is successful.

[0025] The controller is further configured to send a discharging preparation ready message to the charger corresponding to the at least one charging interface when the third switch is detected to be closed, and enter a pre-charging operation after receiving a first reply message corresponding to the discharging preparation ready message.

[0026] In one or more embodiments, the controller is further configured to obtain power requirements of the charger corresponding to the at least one charging interface and send the power requirements to the BMS, so that the BMS adjusts the power transmission current of the battery based on the power requirements.

[0027] In one or more embodiments, the controller is further configured to obtain a first charging state of the charger corresponding to the at least one charging interface.

[0028] And when the first charging state indicates to stop charging, the controller is further configured to disconnect the first switch unit corresponding to the charger corresponding to the at least one charging interface after information interaction of a discharging end phase with the charger corresponding to the at least one charging interface.

[0029] In one or more embodiments, the controller is further configured to send a second charging state to the BMS when the connection state of the power transmission interface is detected to be disconnected and the connection state of the at least one charging interface is detected to be disconnected.

[0030] And when the second charging state indicates to end charging, the controller is further configured to disconnect the second switch unit and unlock the electronic lock after information interaction of a discharging end phase with the BMS.

[0031] The power distribution box for vehicle discharging provided by the embodiment of the application comprises a controller and at least two first switch units; the first end of each first switch unit is connected with a power transmission interface of a vehicle, and the second end of each first switch unit is connected with a corresponding charging interface; the controller is connected with the at least two first switch units, the power transmission interface and each charging interface, and is used to control the first switch unit corresponding to at least one charging interface to be closed when the connection state of the power distribution box and the power transmission interface is connection and the connection state of the power distribution box and at least one charging interface is connection. The scheme realizes intelligent control management of the multi-path charging and discharging circuit by monitoring the connection state of the power distribution box and the power transmission interface and each charging interface of the vehicle in real time, and controlling the first switch unit of the corresponding charging circuit to be closed when the power transmission interface is connected and at least one charging interface is connected, thereby avoiding energy waste and equipment safety hazards caused by no-load of the power transmission interface or virtual connection of the charging interface, allowing multiple external battery blocks to be independently connected and disconnected as needed, and significantly improving the flexibility and use efficiency of vehicle power distribution under the premise of ensuring system safety. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0033] Figure 1 The application scenario diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure.

[0034] Figure 2 The structure diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure One ;

[0035] Figure 3 The structure diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure Two ;

[0036] Figure 4 The structure diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure Three ;

[0037] Figure 5 The structure diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure Four ;

[0038] Figure 6 The structure diagram of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure Five ;

[0039] Figure 7 The use flow of the power distribution box for vehicle discharging provided by the embodiment of the application is shown in the following figure. Figure One;

[0040] Figure 8 The use flow of the power distribution box for discharging the vehicle provided by the embodiment of the present application Figure Two .

[0041] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the accompanying drawings. In the following description, the same numbers refer to the same elements throughout. The embodiments described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] With the rapid development of low-altitude economy, unmanned aerial vehicles (UAVs) are increasingly used in fields such as agricultural and forestry plant protection, logistics hoisting, and emergency rescue. These application scenarios have high requirements for the endurance and efficiency of UAVs.

[0044] For example, in agricultural and forestry plant protection, UAVs need to frequently replace batteries to complete large-area operations; in logistics hoisting, multiple UAVs need to work simultaneously to improve transportation efficiency.

[0045] Therefore, how to provide an efficient and continuous charging solution for UAV batteries through the DC fast charging interface of a new energy vehicle has become a key technical requirement for improving operational efficiency.

[0046] As a high-energy-density mobile power source, the discharging capability of the DC fast charging interface of a new energy vehicle provides a hardware foundation for the rapid energy replenishment of UAV batteries. However, the charging efficiency of the existing technology is limited to charging one battery at a time, which restricts the full potential of this technology.

[0047] In view of the technical problems existing in the prior art, the inventor's idea is as follows: a single discharge interface of a vehicle can be expanded into a power distribution hub, a plurality of independent switch units are arranged to control respective charging branches, and a controller is introduced to detect the connection state of the power transmission interface and the charging interface in real time; when it is confirmed that the vehicle power supply is stably connected and at least one external battery is reliably connected, the switch of the corresponding branch is automatically turned on. That is, the vehicle electric energy can be distributed as needed, which not only avoids the management confusion and safety risks caused by the current parallel charging, but also realizes orderly charging of multiple devices through the independent control mechanism of the branch, and finally realizes the demand of safe and efficient service of the vehicle discharge system for multiple loads.

[0048] On the basis of the above technical idea, Figure 1 The application scenario of the power distribution box for vehicle discharge provided by the embodiment of the application is shown in Figure 1 The application scenario includes a charger 1, a charger 2, a power distribution box 13, and a vehicle 14.

[0049] The vehicle 14 and the power distribution box 13 are connected through a vehicle plug and a vehicle socket; the power distribution box 13 and the charger 11 and the charger 12 are connected through a power distribution box plug and a power distribution box socket, respectively.

[0050] In a possible implementation, when the vehicle 14 is connected to the power distribution box 13, and the power distribution box 13 is connected to the charger 11 and / or the charger 12, the battery in the vehicle supplies power to the battery block corresponding to the charger 11 and / or the charger 12.

[0051] The power transmission interface 23 described below can include a vehicle plug and a vehicle socket; the charging interface 24 can include a power distribution box socket and a power distribution box plug.

[0052] It should be understood that the embodiment of the application is exemplified by two chargers (corresponding to the external battery block), and actual implementation can include two or even more; the external battery block can be a power supply battery of an electric device such as a drone.

[0053] The technical solutions of the application and how the technical solutions of the application solve the above technical problems will be described in detail in the specific embodiments based on the application scenario. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described in detail in some embodiments. The embodiments of the application will be described below with reference to the drawings.

[0054] Figure 2 The structure of the power distribution box for vehicle discharge provided by the embodiment of the application is shown in Figure One As shown in Figure 2 The power distribution box 13 includes a controller 21 and at least two first switch units 22.

[0055] The first end of each first switch unit is connected with the power transmission interface 23 of the vehicle, and the second end of each first switch unit 22 is connected with the corresponding charging interface 24 respectively;

[0056] In this implementation, the connection mode of the first end of each first switch unit with the power transmission interface 23 of the vehicle and the second end of the first switch unit 22 with the corresponding charging interface 24 can be connected through a physical line;

[0057] Wherein, the controller 21 can be a microcontroller unit (MCU); the power transmission interface 23 can be the vehicle plug and the vehicle socket as described above or below; the charging interface 24 can be the distribution box socket and the distribution box plug as described above or below.

[0058] Further, the controller 21 is connected with at least two first switch units 22, the power transmission interface 23, and each charging interface 24 respectively, for obtaining that the connection state of the distribution box 13 with the power transmission interface 23 is connected, and the connection state of the distribution box 13 with at least one charging interface 24 is connected, and then controlling the corresponding first switch unit 22 of the at least one charging interface 24 to be closed.

[0059] In this implementation, the connection mode of the controller 21 with at least two first switch units 22, the power transmission interface 23, and each charging interface 24 can be communication connection.

[0060] Wherein, the connection state of the distribution box 13 with the power transmission interface 23 is connected, that is, the vehicle side CC1 signal is detected to be 4V; when the connection state of the distribution box 13 with at least one charging interface 24 is connected, taking the charger 1 as an example, it indicates that the charger 1 side CC2 signal, that is, CC2' is detected to be 1000Ω.

[0061] The power distribution box for vehicle discharging provided by the embodiments of the present application comprises a controller and at least two first switch units; the first end of each first switch unit is connected with a power transmission interface of a vehicle, and the second end of each first switch unit is connected with a corresponding charging interface; the controller is connected with the at least two first switch units, the power transmission interface, and each charging interface, and is used to control the first switch unit corresponding to at least one charging interface to be closed when the connection state of the power distribution box and the power transmission interface is connected and the connection state of the power distribution box and at least one charging interface is connected. This scheme realizes intelligent control management of a multi-path charging and discharging circuit by using the controller to monitor the connection state of the power distribution box and the power transmission interface and each charging interface of the vehicle in real time, and controlling the first switch unit of the corresponding charging circuit to be closed when the power transmission interface is connected and at least one charging interface is connected, thereby avoiding energy waste and equipment safety hazards caused by no-load of the power transmission interface or virtual connection of the charging interface, allowing multiple external battery blocks to be independently turned on and off as needed, and significantly improving the flexibility and use efficiency of vehicle power distribution under the premise of ensuring system safety.

[0062] On the basis of the above embodiments, Figure 3 The structure of the power distribution box for vehicle discharging provided by the embodiments of the present application is shown in Figure Two As shown in Figure 3 The power distribution box 13 further comprises a power supply unit 31 and a second switch unit 32.

[0063] The controller 21 is connected with the second switch unit 32, and is used to control the second switch unit 32 and the electronic lock of the power transmission interface 23 to be closed when the connection state of the power distribution box 13 and the power transmission interface 23 is connected and the connection state of the power distribution box 13 and at least one charging interface 24 is connected.

[0064] In this implementation, when the connection state with the power transmission interface 23 is connected and the connection state with at least one charging interface 24 is connected, a closing instruction is sent to the second switch unit 32 and the electronic lock to make the second switch unit 32 and the electronic lock closed.

[0065] The second switch unit 32 can be a contactor K3 / K4.

[0066] Optionally, in order to ensure the safety of the charging process, the electronic lock can be closed first, and then the contactor K3 / K4 is closed.

[0067] Further, the power supply unit 31 is connected with the BMS of the vehicle and the chargers corresponding to the at least two charging interfaces 24 through the second switch unit 32, and is used to supply low-voltage power to the BMS and the corresponding chargers.

[0068] In this implementation, the power supply unit 31 can be a 12V auxiliary power supply; the 12V auxiliary power supply needs to supply power to the charger and the BMS, in order to wake up and maintain the normal operation of the entire discharge system.

[0069] 1) In the BMS, the BMS and the core components such as the control high-voltage contactor (K5, K6) are powered by the 12V low-voltage battery; when the vehicle is in the off state, in order to save power, the BMS and most controllers will enter a sleep or low-power state; when the power distribution box 13 is plugged into the vehicle's fast charging port, the vehicle needs to be woken up to indicate that there is an external device (i.e. the external device corresponding to the charger) requesting discharge.

[0070] In combination with the following Figure 6 Examples, the power distribution box 13 connects its internal 12V auxiliary power supply to the vehicle's fast charging port communication terminals (i.e. the A+ and A- terminals for providing auxiliary power) by closing the contactors K3 / K4. Provides working power for the vehicle's BMS, wakes it up from sleep, and starts CAN communication with the power distribution box (through S+, S-).

[0071] 2) In the charger, the 12V auxiliary power supply of the power distribution box 13 will also be provided to the connected charger through the communication terminals of its output socket (socket 1 and socket 2).

[0072] That is, as soon as the charger is plugged into the power distribution box 13, it obtains the working voltage required for startup, and the internal controller and CAN communication module start working and can perform handshake and configuration communication with the power distribution box 13 (through S+, / S+ and S-, S-; and (through S+, S- and S+, S-)).

[0073] Further, the power distribution box 13 further comprises a DC / DC unit 33;

[0074] The DC / DC unit 33 is connected with the power transmission interface 23 and the power supply unit 31 respectively, for transmitting the electric energy of the battery in the vehicle to the power supply unit 31 through the power transmission interface 23.

[0075] In this implementation, the DC / DC unit 33 can be a DCDC module for charging the auxiliary 12V auxiliary power supply, for converting the battery power and charging the 12V auxiliary power supply.

[0076] The power distribution box for vehicle discharging provided in the embodiments of the present application further comprises a power supply unit and a second switch unit; the controller is connected with the second switch unit, and is configured to control the second switch unit and the electronic lock of the power transmission interface to be closed when the connection state of the power distribution box and the power transmission interface is connected and the connection state of the power distribution box and the at least one charging interface is connected; the power supply unit is connected with the battery management unit BMS of the vehicle and the chargers corresponding to the at least two charging interfaces respectively through the second switch unit, and is configured to supply low-voltage power to the BMS and the corresponding chargers. The scheme adds the power supply unit and the second switch unit, and automatically closes the second switch unit and the electronic lock by using the controller when the power transmission interface and the charging interface are simultaneously connected, so that the power supply unit can supply low-voltage power to the BMS and the chargers simultaneously, thereby realizing the autonomous power-on and cooperative start of the BMS and the chargers in the vehicle discharging process without the intervention of an external low-voltage power supply, simplifying the operation process, and improving the system integration and the reliability of the discharging control.

[0077] On the basis of the above embodiments, Figure 4 The structure diagram of the power distribution box for vehicle discharging provided in the embodiments of the present application is shown in Figure Three As shown in Figure 4 Each first switch unit 22 comprises a first switch 221, a second switch 222, and a first resistor 223.

[0078] For each first switch unit 22, the first switch 221 is connected with the power transmission interface 23 and the charging interface 24 respectively, and the second switch 222 and the first resistor 223 are connected with the power transmission interface 23 and the charging interface 24 respectively.

[0079] The controller 21 is configured to close the second switch 222 to enable the power transmission interface 23 to perform the pre-charging operation of high-voltage transmission on the corresponding charging interface 24; and the controller 21 is further configured to close the first switch 221 and open the second switch 222 after the pre-charging operation is completed, so as to enable the power transmission interface 23 to perform the charging operation of high-voltage transmission on the corresponding charging interface 24.

[0080] For example, the first switch 221 can be a contactor K5' and a contactor K5''; the second switch 222 can be a pre-charge contactor Kprecharge' and a pre-charge contactor Kprecharge''; and the first resistor 223 can be a pre-charge resistor Rprecharge' and a pre-charge resistor Rprecharge'', and the embodiments are described as follows:

[0081] The controller 21 closes Kprecharge" or Kprecharge' to precharge, and after the precharge operation is completed within 1s, K5' or K5" is closed and Kprecharge" or Kprecharge' is disconnected, and then the normal charging process is entered.

[0082] Optionally, each first switch unit 22 further comprises a fuse 224.

[0083] The fuse 224 is arranged between the power transmission interface 23 and the first switch 221, and is used to be fused when the current value corresponding to the charging operation is greater than the fusing current value of the fuse 224.

[0084] The fuse 224 can be the fuse 1 and the fuse 2 described below.

[0085] The power distribution box for vehicle discharging provided by the embodiments of the present application comprises: a plurality of first switch units, a plurality of charging interfaces, a plurality of power transmission interfaces, and a controller; each first switch unit comprises a first switch, a second switch, and a first resistor; for each first switch unit, the first switch is connected with the power transmission interface and the charging interface respectively, and the second switch and the first resistor are connected with the power transmission interface and the charging interface respectively; the controller is configured to close the second switch to enable the power transmission interface to perform a precharge operation of high-voltage transmission on the corresponding charging interface; and the controller is further configured to, after the precharge operation is completed, close the first switch and disconnect the second switch to enable the power transmission interface to perform a charging operation of high-voltage transmission on the corresponding charging interface. By arranging the first switch, the second switch, and the first resistor in each first switch unit and adopting a phased control strategy, that is, first closing the second switch to perform current-limited precharge by using the first resistor, and then switching to close the first switch to realize full-power charging, the scheme can effectively suppress the instantaneous impact current when the high-voltage circuit is initially turned on, avoid surge damage to the electrical equipment, improve the reliability and safety of the high-voltage transmission process, and prolong the service life of the electrical elements through soft start.

[0086] On the basis of the above-mentioned embodiments, Figure 5 The structure of the power distribution box for vehicle discharging provided by the embodiments of the present application is shown in Figure Four As Figure 5 shown, in order to simplify the drawings and facilitate understanding of the scheme, the specific implementation structure of the first switch unit 22 in Figure 5 is not given Figure 4 here.

[0087] The controller 21 is connected with the BMS respectively; the controller 21 is configured to initiate a first handshake process to the BMS; and the controller 21 is further configured to, after the first handshake process is successful, exchange discharging configuration parameter information with the BMS, so that the BMS enters a discharging ready state and closes the third switch 51 between the battery of the vehicle and the power transmission interface 23.

[0088] For example, taking the third switch 51 as contactor K5 / K6 as an example, the controller 21 is used to initiate the first handshake process to the BMS (see...). Figure 7 (In the handshake phase); after the first handshake process is successful, the distribution box 13 and the BMS exchange discharge configuration parameter information. After the BMS is ready to discharge, it closes K5 and K6, and then performs insulation detection.

[0089] Optionally, the controller 21 is connected to the chargers corresponding to at least two charging ports 24 respectively; the controller 21 is used to initiate a second handshake process to the charger corresponding to at least one charging port 24; the controller 21 is also used to send discharge configuration parameter information to the chargers corresponding to at least one charging port 24 after the second handshake process is successful.

[0090] For example, the controller 21 is connected to a charger corresponding to at least two charging ports 24 respectively; the controller 21 is used to initiate a second handshake process to the charger corresponding to at least one charging port 24 (see...). Figure 8 During the handshake phase, after the second handshake process is successful, the power distribution box 13 and the charger exchange discharge configuration parameter information.

[0091] Optionally, the controller 21 is also configured to send a discharge ready message to at least one charger corresponding to the charging interface 24 when the third switch 51 is detected to be closed, and to enter the pre-charging operation after receiving the first reply message corresponding to the discharge ready message.

[0092] For example, after the power distribution box detects that K5 / K6 is closed, it sends a discharge ready message BRO SPN2829=0×AA to the charger. After receiving the first reply message from the charger, namely the message CRO SPN2830=0×AA, it closes Kprecharge' or Kprecharge" to perform pre-charging.

[0093] Then, after precharging is completed within 1 second, close K5' or K5", and disconnect Kprecharge or Kprecharge'.

[0094] Optionally, the controller 21 is also configured to acquire the power demand of the charger corresponding to at least one charging interface 24 and send it to the BMS so that the BMS can adjust the battery's transmission current based on the power demand.

[0095] For example, controller 21 adjusts the discharge current according to the power requirements of the charger.

[0096] Optionally, the controller 21 is also used to acquire the first charging state of the charger corresponding to at least one charging port 24;

[0097] And when the first charging state indicates to stop charging, the charger corresponding to the at least one charging interface 24 performs information interaction of the discharge end phase, and then the first switch unit 22 corresponding to the charger corresponding to the at least one charging interface 24 is disconnected.

[0098] In this implementation, the controller 21 judges whether the discharge is stopped (the battery is full or manually ended), that is, whether the first charging state of the charger corresponding to the at least one charging interface 24 is full or the connection is disconnected. That is, the power distribution box 13 and the charger perform information interaction based on GB / T 27930, the power distribution box 13 and the BMS perform information interaction based on GB / T 27930, and the effectiveness of CC2' and CC2" is detected to make a judgment.

[0099] Optionally, the controller 21 is further configured to send a second charging state to the BMS when it is detected that the connection state of the power transmission interface 23 is disconnected and the connection state of the at least one charging interface 24 is disconnected; and when the second charging state indicates that the charging is ended, the information interaction of the discharge end phase is completed with the BMS, the second switch unit 32 is disconnected, and the electronic lock is released.

[0100] In this implementation, when it is detected that the connection state of the power transmission interface 23 is disconnected and the connection state of the at least one charging interface 24 is disconnected, the controller 21 sends a second charging state to the BMS. If the second charging state indicates a charging termination charging message, it indicates that the charging is ended. After the information interaction of the discharge end phase is completed with the BMS, the power distribution box 13 controls K3\K4 to be disconnected, and the electronic lock is released.

[0101] The power distribution box for vehicle discharge provided by the embodiments of the present application includes a controller connected with the BMS; the controller is configured to initiate a first handshake process with the BMS; and after the first handshake process is successful, the controller is further configured to exchange discharge configuration parameter information with the BMS, so that the BMS enters a discharge ready state and closes a third switch between the battery of the vehicle and the power transmission interface. This scheme establishes communication between the controller and the BMS, performs a handshake and parameter interaction process, ensures that the BMS can accurately obtain and confirm the discharge configuration before discharging, and only instructs to close the main circuit third switch after the self-checking and protocol negotiation are completely successful, thereby realizing safe and orderly start of the battery discharge process and effectively preventing misoperation or safety risks caused by parameter mismatch or system unpreparedness.

[0102] On the basis of the above-mentioned embodiments, Figure 6 The structure of the power distribution box for vehicle discharge provided by the embodiments of the present application is shown in the figure. Figure Five As shown in the figure, an application example of the power distribution box 13 is provided to illustrate the interaction between the vehicle and the two chargers. Figure 6

[0103] ​Wherein the device in the schematic includes the following: power distribution box controller, power distribution box 12V auxiliary power supply, power distribution box auxiliary 12V power supply charging DCDC module, auxiliary 12V power supply power supply loop contactor K3\K4, power distribution box socket 1 fuse 1\contactor K5'\precharge contactor Kprecharge'\precharge resistor Rprecharge', power distribution box socket 2 fuse 2\contactor K5''\precharge contactor Kprecharge''\precharge resistor Rprecharge'', S+\S- is the fast charging CAN (based on GB\T 27930) between the power distribution box and the vehicle BMS before, S+'\S- 'is the fast charging CAN (based on GB\T 27930) between the power distribution box and the charger 1, S+''\S-''is the fast charging CAN (based on GB\T 27930) between the power distribution box and the charger 2, CC1 is the power distribution box vehicle side CC1 signal, CC2' is the CC2 signal on the power distribution box socket 1 side, CC2" is the CC2 signal on the power distribution box socket 2 side.

[0104] In one possible implementation, the application implementation of the power distribution box 13 can be:

[0105] 1), the vehicle plug is inserted into the vehicle socket:

[0106] Insert the vehicle plug into the vehicle socket, and make the vehicle in an unrideable state through interlocking or other control measures. At this time, the power distribution box detects that CC1=4V. The power distribution box waits for the insertion of socket 1 or 2 into the plug.

[0107] 2), the power distribution box plug is inserted into the power distribution box socket:

[0108] Insert the plug of charger 1 or charger 2 into the power distribution box socket, at which time the power distribution box detects that the CC2' or CC2" resistor is 1000Ω, then close the electronic lock of the vehicle plug, and after the electronic lock is closed, K3\K4 is closed.

[0109] 3), discharging handshake phase:

[0110] The power distribution box and the electric vehicle BMS initiate a handshake process based on the GB\T 27930 protocol; at the same time, the power distribution box and the charger initiate a handshake process based on the GB\T 27930.

[0111] 4), discharging configuration phase:

[0112] The distribution box and the BMS mutually send discharge configuration parameter information, the BMS is ready for discharge, K5\K6 is closed, and insulation detection is performed. At the same time, the distribution box and the charger mutually send discharge configuration parameter information, the distribution box detects that K5\K6 is closed, sends a discharge preparation ready message BRO SPN2829=0×AA to the charger, and after receiving the message CRO SPN2830=0×AA sent by the charger, Kprecharge or Kprecharge' is closed to perform pre-charging, and after pre-charging is completed within 1s, K5' or K5'' is closed and Kprecharge or Kprecharge' is disconnected.

[0113] 5), discharge phase:

[0114] The distribution box adjusts the discharge current according to the power demand of the charger, and judges whether the discharge is stopped (the battery is fully charged or artificially ended), the distribution box and the charger perform information interaction based on GB\T 27930. At the same time, the distribution box and the BMS of the electric vehicle perform information interaction based on GB\T 27930, and detect the validity of CC2' and CC2''.

[0115] 6), discharge end phase:

[0116] After the charger stops charging, the CST message is sent to the distribution box, after the information interaction of the discharge end phase based on GB\T 27930 is completed, K5' or K5'' of the distribution box is disconnected. The distribution box waits for the distribution box plug to be pulled out, after the plugs of the distribution box socket 1 and the distribution box socket 2 are pulled out (that is, the distribution box detects that CC2' is invalid and CC2'' is invalid), the CST message is sent to the BMS of the electric vehicle, and the distribution box and the BMS perform information interaction of the discharge end phase according to GB\T 27930. After the information interaction is completed, K3\K4 of the distribution box is disconnected, and the electronic lock is released.

[0117] On the basis of the above Figure 6 embodiments, Figure 7 the use flow of the distribution box for vehicle discharge provided by the embodiments of the present application is shown Figure One , which is described by taking the discharge state flow of the vehicle side as an example:

[0118] Exemplarily, the interaction between the distribution box (for example, the discharge related message refers to GB\T 27930) and the vehicle (for example, CC2=1000Ω) is described:

[0119] Distribution box: detect CC1=4V; detect whether CC2'' or CC2' =1000Ω? If not, re-detect CC1; if yes, close the electronic lock; close K3\K4;

[0120] Handshake phase: the power distribution box and the vehicle perform a handshake process (i.e., the power distribution box sends a charge management CHM to the vehicle; the vehicle replies to the power distribution box with a battery handshake message BHM; the power distribution box sends a charge ready message CRM SPN2560=0x00 to the vehicle; the vehicle replies to the power distribution box with a battery request message BRM; and the power distribution box sends a CRM SPN2560=0xAA to the vehicle);

[0121] Configuration phase: after the handshake is successful, the power distribution box and the vehicle exchange discharge configuration parameter information (i.e., the vehicle sends a charge communication protocol handshake message BCP to the power distribution box; the power distribution box sends a charge time synchronization response CTS to the vehicle; the power distribution box sends a charge maximum output level message CML to the vehicle; the vehicle sends a battery charge request message BRO SPN2829=0 00 to the power distribution box, and the vehicle closes K5 / K6 after being ready to discharge (after being ready, the vehicle sends a discharge ready message BRO SPN2829=0xAA to the power distribution box; the power distribution box sends a CRO SPN2830=0x00 to the vehicle, and a charge ready response message CRO SPN2830=0xAA), and performs insulation monitoring;

[0122] Discharge phase: the vehicle sends a charge status message BCS to the power distribution box, and a battery charge level message BCL; the power distribution box adjusts the discharge current according to the power demand of the charger, and determines whether to stop discharging (CC2' is invalid, and CC2" is invalid (i.e., based on the power distribution box sending a charge control status message CCS to the vehicle, and the vehicle sending a battery status message BSM to the power distribution box; after yes, the power distribution box sends a charge termination charge message CST to the vehicle, and the vehicle sends a battery termination charge message BST to the power distribution box));

[0123] End phase: the vehicle sends a battery side shutdown message BSD to the power distribution box; the power distribution box sends a charge side shutdown message CSD to the vehicle; the power distribution box controls K3 / K4 to be disconnected, and the electronic lock is released; and the vehicle disconnects K5 / K6.

[0124] Based on the above Figure 6 described embodiments, Figure 8 a use flow of the power distribution box for vehicle discharge provided by the embodiments of the present application is provided Figure Two , which is described by taking a charger side discharge state flow as an example:

[0125] Exemplarily, the interaction between the power distribution box (for example, CC2' or CC2"=1000Ω) and the charger (for example, GB / T 27930) is described:

[0126] Handshake phase: handshake process is performed between the power distribution box and the charger (i.e., the charger sends CHM to the power distribution box; the power distribution box replies BHM to the charger; the charger sends CRM SPN2560=0x00 to the power distribution box; the power distribution box replies BRM to the charger; the charger sends CRM SPN2560=0xAA to the power distribution box);

[0127] Configuration phase: after the handshake is successful, the power distribution box and the charger exchange discharge configuration parameter information (i.e., the power distribution box sends BCP to the charger; the charger sends CTS to the power distribution box; the charger sends CML to the power distribution box; the power distribution box sends BRO SPN2829=0 00 to the charger), the charging box detects that K5\K6 is closed (after detecting the closure, the power distribution box sends BRO SPN2829=0x AA to the charger; the charger sends CRO SPN2830=0x00 to the power distribution box, and sends CRO SPN2830=0xAA);

[0128] Discharge phase: the power distribution box receives CRO SPN2830=0xAA, and completes pre-charging within 1s and sends BCL; the power distribution box sends BCS to the charger; and sends BCL; the power distribution box performs pre-charging, and after completion, sends a battery charging level message (English abbreviation: BCL) to the charger; the charger adjusts the current, and judges whether the charging is stopped (after that, the charger sends CST to the power distribution box; and the power distribution box sends BST to the charger);

[0129] End phase: the power distribution box sends BSD to the charger; the charger sends CSD to the power distribution box; the power distribution box disconnects K5' or K5''.

[0130] The use flow example of the power distribution box for vehicle discharge provided by the embodiments of the present application can realize charging of two battery blocks at the same time, shorten the overall charging time of the battery pack, greatly improve the work efficiency, and reduce the time and labor cost.

[0131] Finally, it should be noted that: other embodiments of the present application will be easily thought of by those skilled in the art after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptive changes of the present application, which follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed by the present application, and are not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A distribution box for discharging a vehicle, characterized by, The application relates to a power supply device for a vehicle, comprising: a controller and at least two first switch units; a first end of each first switch unit is connected with a power transmission interface of the vehicle, and a second end of each first switch unit is connected with a corresponding charging interface; the controller is connected with the at least two first switch units, the power transmission interface and each charging interface, and is used for controlling a first switch unit corresponding to at least one charging interface to be closed when the connection state of the power distribution box and the power transmission interface is connection and the connection state of the power distribution box and the at least one charging interface is connection.

2. The power distribution box of claim 1, wherein, Further comprising: a power supply unit and a second switch unit; the controller is connected with the second switch unit, and is used for controlling the second switch unit and an electronic lock of the power transmission interface to be closed when the connection state of the power distribution box and the power transmission interface is connection and the connection state of the power distribution box and the at least one charging interface is connection; the power supply unit is connected with a battery management unit (BMS) of the vehicle and chargers corresponding to the at least two charging interfaces through the second switch unit, and is used for low-voltage power supply to the BMS and the corresponding chargers.

3. The power distribution box of claim 2, wherein, Further comprising: a direct current-direct current (DC / DC) unit; the DC / DC unit is connected with the power transmission interface and the power supply unit, and is used for transmitting the electric energy of a battery in the vehicle to the power supply unit through the power transmission interface.

4. The power distribution box of any one of claims 1-3, wherein, Each first switch unit comprises a first switch, a second switch and a first resistor; for each first switch unit, the first switch is connected with the power transmission interface and the charging interface, the second switch and the first resistor are connected with the power transmission interface and the charging interface; the controller is used for closing the second switch to make the power transmission interface perform a pre-charging operation of high-voltage transmission on the corresponding charging interface; the controller is further used for closing the first switch and opening the second switch after the pre-charging operation is completed, so that the power transmission interface performs a charging operation of high-voltage transmission on the corresponding charging interface.

5. The power distribution box of claim 4, wherein, Each first switch unit further comprises a fuse; the fuse is arranged between the power transmission interface and the first switch, and is used for being fused when a current value corresponding to the charging operation is greater than a fuse current value of the fuse.

6. The power distribution box of claim 2 or 3, wherein, the controller is connected with the BMS; the controller is used for initiating a first handshake process to the BMS; the controller is further used for exchanging discharge configuration parameter information with the BMS after the first handshake process is successful, so that the BMS enters a discharge ready state and closes a third switch between a battery of the vehicle and the power transmission interface.

7. The power distribution box of claim 6, wherein, the controller is connected with chargers corresponding to the at least two charging interfaces; the controller is used for initiating a second handshake process to the charger corresponding to the at least one charging interface; the controller is further used for exchanging discharge configuration parameter information with the charger corresponding to the at least one charging interface after the second handshake process is successful. The controller is further configured to send a discharge preparation ready message to the charger corresponding to the at least one charging interface when detecting that the third switch is closed, and enter a pre-charging operation after receiving a first reply message corresponding to the discharge preparation ready message.

8. The power distribution box of claim 7, wherein, The controller is further configured to acquire power requirements of the charger corresponding to the at least one charging interface and send the power requirements to the BMS, so that the BMS adjusts the power transmission current of the battery based on the power requirements.

9. The power distribution box of claim 7, wherein, The controller is further configured to acquire a first charging state of the charger corresponding to the at least one charging interface; When the first charging state indicates to stop charging, and after information interaction with the charger corresponding to the at least one charging interface in the discharge end phase, the controller is further configured to disconnect the first switch unit corresponding to the charger corresponding to the at least one charging interface.

10. The power distribution box of any of claims 7-9, wherein, The controller is further configured to send a second charging state to the BMS when detecting that the connection state of the power transmission interface is disconnected and the connection state of the at least one charging interface is disconnected; When the second charging state indicates to end charging, and after information interaction with the BMS in the discharge end phase, the controller is further configured to disconnect the second switch unit and unlock the electronic lock.

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