CN116198319B

CN116198319B - Vehicle and power supply method thereof

Info

Publication number: CN116198319B
Application number: CN202111449556.5A
Authority: CN
Inventors: 鲁豪; 谭志成
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2025-03-07
Anticipated expiration: 2041-11-30
Also published as: CN116198319A

Abstract

The invention discloses a vehicle and a power supply method thereof. The vehicle comprises a vehicle control unit, a vehicle through line and a plurality of carriages, each carriage comprises a power battery assembly and a plurality of load branches connected in parallel at two ends of the corresponding power battery assembly, and a battery management controller used for acquiring the SOC value of the corresponding power battery assembly, the load branches comprise DC-DC converter branches, each DC-DC converter branch comprises an extended power supply contactor and a DC-DC converter, a first DC end of each DC-DC converter is connected in parallel with the corresponding power battery assembly, a second DC end of each DC-DC converter is connected in the vehicle through line through the corresponding extended power supply contactor, the vehicle control unit is used for receiving the battery SOC values of all carriages, calculating the difference between the maximum value and the minimum value, controlling the power battery assembly of the corresponding carriage to supply power to the vehicle through line when the difference is larger than a first preset value, and controlling the power battery assembly of the corresponding carriage to supply power to the vehicle through line through the minimum value. The vehicle can realize the SOC balance of the batteries in each carriage.

Description

Vehicle and power supply method thereof

Technical Field

The invention relates to the technical field of vehicles, in particular to a vehicle and a power supply method thereof.

Background

In the related art, a vehicle adopts a self-charging battery pack to provide electric energy for vehicle traction and related high-voltage equipment. Because the electricity consumption condition generally has the difference in different carriages, this energy supply mode can produce each battery package electric quantity inconsistent condition between different carriages after the long-time operation of vehicle, and then leads to the lower carriage of battery package electric quantity can't provide sufficient electric quantity, and other carriages even the electric quantity is enough also can't continue the operation, and the vehicle needs to return to the storehouse to charge to reduce the energy utilization of vehicle, be unfavorable for improving the operating efficiency of vehicle.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a vehicle for improving capacity utilization and efficiency.

A second object of the present invention is to propose a method for supplying power to a vehicle.

In order to achieve the above objective, an embodiment of a first aspect of the present invention provides a vehicle, including a vehicle control unit, a vehicle through line and M carriages, where M is an integer greater than 1, the vehicle through line includes a first line and a second line penetrating through the vehicle, each carriage includes a battery management controller, a power battery assembly, and a plurality of load branches, the battery management controller is configured to obtain a battery SOC (State of Charge) value of the corresponding power battery assembly, each load branch is connected in parallel to two ends of the corresponding power battery assembly, the plurality of load branches includes a DC-DC converter branch, the DC-DC converter branch includes a DC-DC converter and an extended power supply contactor, a first DC end of the DC-DC converter is connected in parallel to two ends of the corresponding power battery assembly, and a second DC end of the DC-DC converter is connected to the first line and the second line through the corresponding extended power supply contactor, where the battery management controller is configured to receive a battery SOC value sent by the M battery management controllers, calculate a maximum SOC value of the battery management controller and send the SOC value to the corresponding vehicle through line to the first line and a maximum SOC value of the vehicle through SOC value to the first line and a maximum SOC value of the vehicle is the maximum SOC value of the vehicle through line is calculated and the maximum SOC value of the vehicle is the maximum SOC value of the vehicle power value is the corresponding to the vehicle SOC value.

In order to achieve the above object, a second aspect of the present invention provides a power supply method for a vehicle, where the vehicle includes a whole vehicle through line and M carriages, M is an integer greater than 1, the whole vehicle through line includes a first line and a second line penetrating through the whole vehicle, each carriage includes a battery management controller, a power battery assembly, and a plurality of load branches, the battery management controller is configured to obtain a battery SOC value of the corresponding power battery assembly, each load branch is connected in parallel to two ends of the corresponding power battery assembly, the plurality of load branches includes a DC-DC converter branch, the DC-DC converter branch includes a DC-DC converter and an expansion power supply contactor, a first DC end of the DC-DC converter is connected in parallel to two ends of the corresponding power battery assembly, and a second DC end of the DC-DC converter is connected to the first line and the second line through the corresponding expansion power supply contactor, the method includes receiving battery SOC values sent by the M battery management controllers, calculating a maximum battery SOC value and a minimum battery SOC value, and when the maximum battery SOC value and the maximum battery SOC value are connected in parallel to the first line through line, the first DC end of the DC-DC converter is connected to the first line, and the maximum SOC value of the first line is corresponding to the maximum SOC value of the whole vehicle through line.

According to the vehicle and the power supply method thereof, the whole vehicle control unit can obtain the battery SOC values of the power battery assemblies in each compartment according to the battery management controller, further calculate the difference between the maximum battery SOC value and the minimum battery SOC value after obtaining the battery SOC values, control the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the whole vehicle through-line when the difference is larger than a first preset value, and control the compartment corresponding to the minimum battery SOC value to supply power through the whole vehicle through-line, so that the power battery assembly of the compartment corresponding to the maximum battery SOC value is utilized to supply power to the compartment corresponding to the lowest battery SOC value, and the situation that the operation is affected due to insufficient discharge of a single or multiple power battery assemblies is avoided.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of the structure of an exemplary vehicle of the present invention;

FIG. 3 is a schematic view of the structure of an exemplary car of the present invention;

Fig. 4 is a flowchart of a power supply method of a vehicle according to an embodiment of the present invention.

Detailed Description

A vehicle and a power supply method thereof according to an embodiment of the present invention are described below with reference to the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described with reference to the drawings are exemplary and should not be construed as limiting the invention.

Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present invention.

As shown in fig. 1, a vehicle 10 includes a vehicle control unit 300, a vehicle through line 700 and M carriages 100, M is an integer greater than 1, the vehicle through line 700 includes a first line and a second line through the vehicle, each carriage 100 includes a battery management controller 200, a power battery assembly 101 and a plurality of load branches, the battery management controller 200 is used for obtaining a battery SOC value of the corresponding power battery assembly 101, each load branch is connected in parallel with two ends of the corresponding power battery assembly 101, the plurality of load branches includes a DC-DC converter branch, the DC-DC converter branch includes a DC-DC converter 104 and an expansion power supply contactor KM7, a first DC end of the DC-DC converter 104 is connected in parallel with two ends of the corresponding power battery assembly 101, and a second DC end of the DC-DC converter 104 is connected with the first line and the second line of the vehicle through line 700 through the corresponding expansion power supply contactor KM7, wherein the vehicle control unit 300 is used for receiving a battery SOC value sent by the M battery management controllers 200 and calculating a first difference value between the maximum battery SOC value and the minimum battery SOC value, and the first difference value corresponds to the first SOC value of the vehicle 100, that is the vehicle through line 100, and the vehicle through line 700 is supplied with the maximum power value corresponding to the first difference value 100. The DC-DC converter 104 is a bi-directional converter.

Referring to fig. 1, the DC-DC converter branch may further include a start-up battery BT1, and the second DC end of the DC-DC converter 104 is connected in parallel to two ends of the corresponding start-up battery BT1, and then connected to the whole vehicle through-line 700 through the corresponding extended power supply contactor KM 7. Thus, a stable power supply can be provided for each low-voltage electric device.

In this embodiment, the plurality of load branches further includes an auxiliary load branch and a motor controller branch. The auxiliary load branch includes an auxiliary load 102. The motor controller branch includes a motor controller 105. And a motor corresponding to the motor controller 105, wherein the number of the motor controller 105 and the number of the motors are at least one.

The vehicle control unit 300 may be, for example, a CCU (Central Control Unit ), and the Battery management controller 200 may be, for example, a BMS (Battery MANAGEMENT SYSTEM). The auxiliary load 102 may include, for example, an air conditioner, a wind power system, an air compressor, a PTC (Positive Temperature Coefficient ) electric heater, and the like. The vehicle control unit 300 may communicate with the battery management controller 200, the DC-DC converter branch, and the auxiliary loads 102 in each of the vehicle compartments 100 to control them, and may be, for example, network communication, as an example, see fig. 2. The whole vehicle control unit 300 obtains the battery SOC value of the corresponding power battery assembly 101 through the battery management controller 200, and may also obtain the total voltage of the corresponding power battery assembly 101, the cell voltage of a specific battery pack in the power battery assembly 101, and the like.

The auxiliary load 102 may be started when receiving a high-voltage power-on command sent by the vehicle control unit 300 and feeds back a high-voltage power-on success signal to the vehicle control unit 300, and the auxiliary load 102 may be unloaded when receiving an extended power supply command or an extended power supply stop command sent by the vehicle control unit 300 and feeds back an unloading success signal to the vehicle control unit 300.

The DC-DC converter 104 may start the buck mode when receiving the high-voltage power-on command sent by the vehicle control unit 300, and after entering the buck mode, feed back a high-voltage power-on success signal to the vehicle control unit 300. The DC-DC converter 104 may also offload when receiving the extended power supply command or the extended power supply stop command sent by the vehicle control unit 300, and feedback an offload success signal to the vehicle control unit 300. The DC-DC converter 104 may further boost to a preset rated voltage according to a preset slope when receiving a boost command sent by the vehicle control unit 300.

The battery management controller 200 may receive the extended power supply command sent by the vehicle control unit 300, and after receiving the extended power supply command, control the auxiliary negative contactor KM5 and the auxiliary positive contactor KM6 to be disconnected, so as to disconnect the corresponding DC-DC converter branch and auxiliary load branch, and after the auxiliary negative contactor KM5 and the auxiliary positive contactor KM6 are disconnected, feed back an extended power supply success command to the vehicle control unit 300. The battery management controller 200 may further receive an extended power supply stop command sent by the vehicle control unit 300, and after receiving the extended power supply stop command, control the auxiliary negative contactor KM5 and the auxiliary positive contactor KM6 to be closed, so that the corresponding DC-DC converter branch and the auxiliary load branch are connected, and after the auxiliary negative contactor KM5 and the auxiliary positive contactor KM6 are closed, feed back an auxiliary power-on success signal to the vehicle control unit 300.

Specifically, in actual application, the battery management controller 200 may acquire a battery SOC value corresponding to the power battery assembly 101 in the cabin 100 during operation of the vehicle 10, and send the battery SOC value to the overall vehicle control unit 300. The whole vehicle control unit 300 receives the battery SOC values of the corresponding M cars 100, and accordingly adjusts according to the power supply method of the vehicle 10.

The power supply method of the vehicle 10 includes the following steps:

A1, receiving the battery SOC values sent by the M battery management controllers 200, and calculating a first difference between the maximum battery SOC value and the minimum battery SOC value.

A2, when the first difference value is larger than a first preset value, controlling the power battery assembly 101 of the carriage 100 corresponding to the maximum battery SOC value to supply power to the whole vehicle through line 700, and controlling the carriage 100 corresponding to the minimum battery SOC value to supply power in an expanding mode.

As an example, the first preset value may be 3% -7%, for example, 5%, that is, it is determined whether the first difference is greater than 5% of the SOC value of the power battery assembly 101 in the full-power state. And if the first difference is greater than the first preset value, controlling the carriage 100 corresponding to the maximum battery SOC value and the carriage 100 corresponding to the minimum battery SOC value.

Specifically, the vehicle control unit 300 controls the extended power supply contactor KM7 of the vehicle 100 corresponding to the maximum battery SOC to be closed, and sends a high-voltage power-on command to the DC-DC converter 104 of the vehicle 100 corresponding to the maximum battery SOC to enable the DC-DC converter 104 to start the buck mode, and determines that the power battery assembly 101 of the vehicle 100 corresponding to the maximum battery SOC is powered on to the vehicle through line 700 when receiving a high-voltage power-on success signal fed back by the DC-DC converter 104 of the vehicle 100 corresponding to the maximum battery SOC. Thus, the vehicle control unit 300 can control the power battery assembly 101 of the carriage 100 corresponding to the maximum battery SOC value to supply power to the vehicle through-line 700, that is, the power battery assembly 101 of the carriage 100 corresponding to the maximum battery SOC value supplies power to the vehicle through-line 700 through the DC-DC converter 104. The whole vehicle control unit 300 can control the carriage 100 corresponding to the minimum battery SOC value to perform extended power supply, so that the power battery assembly 101 of the carriage 100 corresponding to the maximum battery SOC value supplies power to the carriage 100 corresponding to the minimum battery SOC value.

Specifically, the whole vehicle control unit 300 controls the minimum battery SOC value to perform extended power supply to the cabin 100, including the following steps:

b1, the whole vehicle control unit 300 controls the expanded power supply contactor KM7 of the carriage 100 corresponding to the minimum battery SOC value to be closed, and controls the corresponding DC-DC converter branch and auxiliary load branch to be opened through the battery management controller 200 of the carriage 100 corresponding to the minimum battery SOC value.

Specifically, the vehicle control unit 300 controls the extended power supply contactor KM7 of the carriage 100 corresponding to the minimum battery SOC value to be closed, and sends an extended power supply command to the DC-DC converter 104 of the carriage 100 corresponding to the minimum battery SOC value and the auxiliary load 102 in the auxiliary load branch so as to unload the DC-DC converter 104 and the auxiliary load 102, and when receiving an unloading success signal fed back by the DC-DC converter 104 and the auxiliary load 102, sends an extended power supply command to the battery management controller 200 of the carriage 100 corresponding to the minimum battery SOC value so that the battery management controller 200 controls the corresponding DC-DC converter branch and auxiliary load branch to be disconnected.

Thus, it is possible to control the DC-DC converter 104 and the auxiliary load 102 of the vehicle 100 corresponding to the minimum battery SOC to be unloaded first, and to control the auxiliary negative contactor KM5 and the auxiliary positive contactor KM6 to be disconnected after the unloading is completed, so that the DC-DC converter 104 and the auxiliary load 102 of the vehicle 100 corresponding to the minimum battery SOC are disconnected from the power supply branch of the vehicle 100 corresponding to the minimum battery SOC.

And B2, when an extended power supply success instruction fed back by the battery management controller 200 of the carriage 100 corresponding to the minimum battery SOC value is received, the whole vehicle control unit 300 controls the corresponding DC-DC converter 104 to boost to a preset rated voltage and controls the corresponding auxiliary load 102 to be electrified at high voltage.

Specifically, after receiving an extended power supply success command fed back by the battery management controller 200 of the vehicle 10 corresponding to the minimum battery SOC value, the vehicle control unit 300 sends a boost command to the DC-DC converter 104 of the vehicle 100 corresponding to the minimum battery SOC value, so that the DC-DC converter 104 is boosted to a preset rated voltage according to a preset slope, and sends a high-voltage power-on command to the auxiliary load 102 of the vehicle 100 corresponding to the minimum battery SOC value, so that the auxiliary load 102 is started, and when receiving a power-on success signal fed back by the auxiliary load 102 of the vehicle 100 corresponding to the minimum battery SOC value, determines that the extended power supply of the vehicle 100 corresponding to the minimum battery SOC value is successful.

Therefore, after the DC-DC converter 104 and the auxiliary load 102 of the carriage 100 corresponding to the minimum battery SOC value are disconnected from the power supply branch of the carriage 100 corresponding to the minimum battery SOC value, the DC-DC converter 104 is controlled to boost to a preset rated voltage according to a preset slope to complete the preparation of supplying power to the auxiliary load 102, and the auxiliary load 102 is further controlled to be powered up, so that the auxiliary load 102 in the carriage 100 corresponding to the minimum battery SOC is not supplied with power by the power battery assembly 101 in the carriage 100 any more, but is supplied with power by the whole vehicle through line 700.

In one embodiment of the present invention, the vehicle control unit 300 is further configured to control the minimum battery SOC value to stop the extended power supply for the vehicle cabin 100 after the extended power supply of the vehicle cabin 100 is successful, and control the minimum battery SOC value to disconnect the extended power supply contactor KM7 of the vehicle cabin 100 and control the maximum battery SOC value to disconnect the extended power supply contactor KM7 of the vehicle cabin 100 after the extended power supply of the vehicle cabin 100 is stopped.

Specifically, during actual use of the vehicle 10, the entire vehicle control unit 300 receives the battery SOC values of the corresponding M cars 100, and calculates a first difference between the maximum battery SOC value and the minimum battery SOC value. If the first difference is smaller than the first preset value, it is determined whether there is a car 100 with successful extended power supply currently.

Further, if it is determined that there is a car 100 with successful extended power supply currently, the car 100 corresponding to the minimum battery SOC value is controlled to stop extended power supply. Specifically, the vehicle control unit 300 transmits an extended power supply stop command to the DC-DC converter 104 and the auxiliary load 102 of the vehicle cabin 100 corresponding to the minimum battery SOC value to unload the DC-DC converter 104 and the auxiliary load 102, transmits an extended power supply stop command to the battery management controller 200 of the vehicle cabin 100 corresponding to the minimum battery SOC value to cause the battery management controller 200 to control the corresponding DC-DC converter branch and the auxiliary load branch to communicate when receiving an unloading success signal fed back from the battery management controller 200 of the vehicle cabin 100 corresponding to the minimum battery SOC value, and transmits a high-voltage power up command to the DC-DC converter 104 and the auxiliary load 102 of the vehicle cabin 100 corresponding to the minimum battery SOC value to cause the DC-DC converter 104 to start the step-down mode and the auxiliary load 102 to start when receiving an auxiliary power-up success signal fed back from the battery management controller 200 of the vehicle cabin 100 corresponding to the minimum battery SOC value.

Further, after the DC-DC converter 104 turns on the buck mode, the extended power supply contactor KM7 of the cabin 100 that is successful in the extended power supply is turned off, and then the extended power supply contactor KM7 of the cabin 100 that supplies power to the whole vehicle through line 700 is turned off, so that the extended power supply corresponding to the cabin 100 with the minimum battery SOC value is controlled to stop.

Thereby, it is possible to control the vehicle cabin 100 in the extended power supply state to stop the extended power supply when the first difference value is smaller than the first preset value.

In one embodiment of the present invention, the positive electrode of the first DC end of the DC-DC converter branch and the positive electrode of the corresponding auxiliary load branch are connected to the positive electrode of the power battery assembly 101 through the auxiliary positive electrode contactor KM6, and the negative electrode of the first DC end of the DC-DC converter branch and the negative electrode of the corresponding auxiliary load branch are connected to the negative electrode of the power battery assembly 101 through the auxiliary negative electrode contactor KM5, and the auxiliary positive electrode contactor KM6 is connected in parallel with a pre-charge resistor and an auxiliary pre-charge contactor that are connected in series.

The battery management controller 200 is specifically configured to control the auxiliary positive contactor KM6, the auxiliary negative contactor KM5, and the auxiliary pre-charge contactor to be closed when controlling the corresponding DC-DC converter branch and the auxiliary load branch to be connected, delay a first preset time, and control the auxiliary pre-charge contactor to be opened. That is, the battery management controller 200 may receive the extended power supply stop command sent by the vehicle control unit 300, control the auxiliary positive contactor KM6, the auxiliary negative contactor KM5, and the auxiliary pre-charging contactor to be closed after receiving the extended power supply stop command, delay a first preset time, control the auxiliary pre-charging contactor to be opened so as to connect the corresponding DC-DC converter branch and the auxiliary load branch, and feed back an auxiliary power-on success signal to the vehicle control unit 300 after the auxiliary negative contactor KM5 is closed. The first preset time is 1 to 5s, for example, may be 3s.

As an example, referring to fig. 3, the DC charger assembly 400, the maintenance switch assembly 500 including the total positive contactor KM8 and the isolation switch QS, the high-voltage distribution box assembly 600, and the first current sensor LH, the second current sensor LH1, the fuse FU1, the positive switch KM1, the negative switch KM4, the first switch KM3, the traction contactor K1, the traction pre-charge contactor K2, the auxiliary pre-charge contactor K4, the charging contactor K5, the charging negative contactor K6, the pre-charge resistor R1, the charging fuse S1, the main fuse S2, the DC-DC fuse S3, the air conditioner fuse S5, the air compressor fuse S6, the leakage sensor 103, the starting battery BT1 is a 24V battery, the whole vehicle through line 700 is a set of through lines, and the DC charger assembly 400 is connected to the high-voltage distribution box assembly 600 through the charging connection device. In this specific example, when the battery management controller 200 controls the corresponding DC-DC converter branch and auxiliary load branch to be connected, the battery management controller is specifically configured to control the auxiliary positive contactor KM6, the auxiliary negative contactor KM5 and the auxiliary pre-charging contactor K4 to be closed, and delay a first preset time to control the auxiliary pre-charging contactor K4 to be opened.

In summary, the vehicle of the embodiment of the invention can realize that the whole vehicle control unit obtains the battery SOC values of the power battery assemblies in each compartment according to the battery management controller, further calculates the difference between the maximum battery SOC value and the minimum battery SOC value after obtaining the battery SOC values, controls the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the whole vehicle through line when the difference is larger than a first preset value, and controls the compartment corresponding to the minimum battery SOC value to supply power in an expanding manner, thereby realizing that the power battery assembly of the compartment corresponding to the maximum battery SOC value supplies power to the compartment corresponding to the lowest battery SOC value, and ensuring that the vehicle cannot be affected by insufficient electric quantity due to the discharge of a single or multiple power battery assemblies, thereby improving the energy utilization rate and efficiency of the vehicle.

In the embodiment of the invention, the vehicle comprises a whole vehicle through line and M carriages, M is an integer larger than 1, the whole vehicle through line comprises a first line and a second line which are communicated with the whole vehicle, each carriage comprises a battery management controller, a power battery assembly and a plurality of load branches, the battery management controller is used for acquiring a battery SOC value of the corresponding power battery assembly, each load branch is connected in parallel with two ends of the corresponding power battery assembly, the plurality of load branches comprise DC-DC converter branches, each DC-DC converter branch comprises a DC-DC converter, a starting battery and an expansion power supply contactor, a first DC end of each DC-DC converter is connected in parallel with two ends of the corresponding power battery assembly, and a second DC end of each DC-DC converter is connected with the first line and the second line through the corresponding expansion power supply contactor.

As shown in fig. 4, the power supply method of the vehicle includes:

s11, receiving the battery SOC values sent by the M battery management controllers, and calculating a first difference value between the maximum battery SOC value and the minimum battery SOC value.

And S12, when the first difference value is larger than a first preset value, controlling a power battery assembly of a carriage corresponding to the maximum battery SOC value to supply power to a whole vehicle through line, and supplying power to a carriage corresponding to the minimum battery SOC value through the whole vehicle through line.

In one embodiment of the invention, controlling the power battery assembly of the carriage corresponding to the maximum battery SOC value to supply power to the whole vehicle through line comprises controlling an extended power supply contactor of the carriage corresponding to the maximum battery SOC value to be closed, sending a high-voltage power-on instruction to a DC-DC converter of the carriage corresponding to the maximum battery SOC value so as to enable the DC-DC converter to start a voltage reduction mode, and determining to realize that the power battery assembly of the carriage corresponding to the maximum battery SOC value supplies power to the whole vehicle through line when receiving a high-voltage power-on success signal fed back by the DC-DC converter of the carriage corresponding to the maximum battery SOC value.

In one embodiment of the invention, the plurality of load branches further comprises auxiliary load branches, and the control of the minimum battery SOC value to perform extended power supply for the carriage comprises the steps of controlling the extended power supply contactor of the carriage corresponding to the minimum battery SOC value to be closed, controlling the corresponding DC-DC converter branch and the auxiliary load branch to be opened through the battery management controller of the carriage corresponding to the minimum battery SOC value, and controlling the corresponding DC-DC converter to boost to a preset rated voltage and controlling the corresponding auxiliary load to be powered on when receiving an extended power supply success instruction fed back by the battery management controller of the carriage corresponding to the minimum battery SOC value.

In one embodiment of the invention, the battery management controller of the carriage corresponding to the minimum battery SOC value is used for controlling the disconnection of the corresponding DC-DC converter branch and auxiliary load branch, and the method comprises the steps of sending an extended power supply instruction to the DC-DC converter of the carriage corresponding to the minimum battery SOC value and auxiliary loads in the auxiliary load branch so as to unload the DC-DC converter and the auxiliary loads, and sending the extended power supply instruction to the battery management controller of the carriage corresponding to the minimum battery SOC value when receiving unloading success signals fed back by the DC-DC converter and the auxiliary loads so as to enable the battery management controller to control the disconnection of the corresponding DC-DC converter branch and the auxiliary load branch.

In one embodiment of the invention, the control of the corresponding DC-DC converter to boost to the preset rated voltage and the control of the corresponding auxiliary load to high-voltage power-on comprise the steps of sending a boost command to the DC-DC converter of the carriage corresponding to the minimum battery SOC value to boost to the preset rated voltage according to the preset slope, sending a high-voltage power-on command to the auxiliary load of the carriage corresponding to the minimum battery SOC value to start the auxiliary load, and determining that the carriage corresponding to the minimum battery SOC value is successful in expanding power supply when receiving a power-on success signal fed back by the auxiliary load of the carriage corresponding to the minimum battery SOC value.

In one embodiment of the invention, the power supply method of the vehicle further comprises the steps of controlling the minimum battery SOC value to stop expanding power supply for the carriage after the minimum battery SOC value corresponds to the carriage and expanding power supply is successful, and controlling the expansion power supply contactor of the carriage corresponding to the minimum battery SOC value to be disconnected and controlling the expansion power supply contactor of the carriage corresponding to the maximum battery SOC value to be disconnected after the minimum battery SOC value corresponds to the carriage and stops expanding power supply.

In one embodiment of the invention, controlling the carriage corresponding to the minimum battery SOC value to stop the extended power supply comprises the steps of sending an extended power supply stop command to a DC-DC converter and an auxiliary load of the carriage corresponding to the minimum battery SOC value to enable the DC-DC converter and the auxiliary load to be unloaded, sending an extended power supply stop command to a battery management controller of the carriage corresponding to the minimum battery SOC value when an unloading success signal fed back by the DC-DC converter and the auxiliary load is received to enable the battery management controller to control the corresponding DC-DC converter branch and the auxiliary load branch to be communicated, and sending a high-voltage power-on command to the DC-DC converter and the auxiliary load of the carriage corresponding to the minimum battery SOC value when an auxiliary power-on success signal fed back by the battery management controller of the carriage corresponding to the minimum battery SOC value is received to enable the DC-DC converter to start a step-down mode and the auxiliary load to be started.

It should be noted that, for other specific implementation manners of the power supply method for a vehicle according to the embodiment of the present invention, reference may be made to the vehicle according to the foregoing embodiment.

According to the power supply method of the vehicle, the whole vehicle control unit can obtain the battery SOC values of the power battery assemblies in each compartment according to the battery management controller, further calculate the difference between the maximum battery SOC value and the minimum battery SOC value after obtaining the battery SOC values, control the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the whole vehicle through line when the difference is larger than the first preset value, and control the compartment corresponding to the minimum battery SOC value to supply power in an expanding mode, so that the power battery assembly of the compartment corresponding to the maximum battery SOC value is used for supplying power to the compartment corresponding to the lowest battery SOC value, and the situation that the vehicle cannot be affected by insufficient electric quantity due to the fact that the single or multiple power battery assemblies are discharged is avoided.

It should be noted that the logic and/or steps represented in the flow diagrams or otherwise described herein may be considered a ordered listing of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include an electrical connection (an electronic device) having one or more wires, a portable computer diskette (a magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of techniques known in the art, discrete logic circuits with logic gates for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present specification, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to an orientation or positional relationship based on that shown in the drawings, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the description of the present specification, unless otherwise indicated, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise specifically defined. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A vehicle, characterized in that it comprises a vehicle control unit, a vehicle through-line and M carriages, M is an integer greater than 1, the vehicle through-line comprises a first line and a second line that penetrate the vehicle, each carriage comprises a battery management controller, a power battery assembly and a plurality of load branches, the battery management controller is used to obtain a battery SOC value of a corresponding power battery assembly, each of the load branches is connected in parallel at both ends of a corresponding power battery assembly, the plurality of load branches included in each carriage comprises a DC-DC converter branch, the DC-DC converter branch comprises a DC-DC converter and an extended power supply contactor, a first DC end of the DC-DC converter is connected in parallel at both ends of a corresponding power battery assembly, and a second DC end of the DC-DC converter is connected to the first line and the second line through a corresponding extended power supply contactor;

The positive electrode of the first DC end of the DC-DC converter branch and the positive electrode of the corresponding auxiliary load branch are both connected to the positive electrode of the power battery assembly through an auxiliary positive electrode contactor, and the negative electrode of the first DC end of the DC-DC converter branch and the negative electrode of the corresponding auxiliary load branch are both connected to the negative electrode of the power battery assembly through an auxiliary negative electrode contactor;

Wherein, the vehicle control unit is used for:

Receiving the battery SOC values sent by the M battery management controllers, and calculating a first difference between a maximum battery SOC value and a minimum battery SOC value;

When the first difference is greater than a first preset value, controlling the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the whole vehicle through-line, and supplying power to the compartment corresponding to the minimum battery SOC value through the whole vehicle through-line;

The multiple load branches also include an auxiliary load branch, and the vehicle control unit supplies power to the carriage corresponding to the minimum battery SOC value through the vehicle through-line, specifically including:

The vehicle control unit controls the extended power supply contactor of the compartment corresponding to the minimum battery SOC value to close, and controls the auxiliary negative contactor and the auxiliary positive contactor to disconnect through the battery management controller of the compartment corresponding to the minimum battery SOC value, so that the corresponding DC-DC converter branch and the auxiliary load branch are disconnected from the power supply branch of the compartment corresponding to the minimum battery SOC value;

Upon receiving the extended power supply entry success instruction fed back by the battery management controller of the car corresponding to the minimum battery SOC value, the corresponding DC-DC converter is controlled to boost the voltage to the preset rated voltage to complete the preparation for powering the corresponding auxiliary load, and the corresponding auxiliary load is controlled to be powered on at high voltage.

2. The vehicle according to claim 1, characterized in that the vehicle control unit controls the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the vehicle through-line, specifically comprising:

The vehicle control unit controls the extended power supply contactor of the compartment corresponding to the maximum battery SOC value to close, and sends a high-voltage power-on instruction to the DC-DC converter of the compartment corresponding to the maximum battery SOC value, so that the DC-DC converter starts the step-down mode;

When a high-voltage power-on success signal fed back by the DC-DC converter of the car corresponding to the maximum battery SOC value is received, it is determined that the power battery assembly of the car corresponding to the maximum battery SOC value supplies power to the vehicle through-line.

3. The vehicle according to claim 1, characterized in that the vehicle control unit controls the corresponding DC-DC converter branch and auxiliary load branch to be disconnected through the battery management controller of the compartment corresponding to the minimum battery SOC value, specifically comprising:

The vehicle control unit sends an extended power supply instruction to the DC-DC converter of the compartment corresponding to the minimum battery SOC value and the auxiliary load in the auxiliary load branch, so as to unload the DC-DC converter and the auxiliary load;

When receiving the unloading success signal fed back by the DC-DC converter and the auxiliary load, an extended power supply instruction is sent to the battery management controller of the carriage corresponding to the minimum battery SOC value, so that the battery management controller controls the corresponding DC-DC converter branch and the auxiliary load branch to disconnect.

4. The vehicle according to claim 1, characterized in that the vehicle control unit controls the corresponding DC-DC converter to boost the voltage to a preset rated voltage, and controls the corresponding auxiliary load to be powered on at high voltage, specifically comprising:

Sending a boost command to the DC-DC converter of the car corresponding to the minimum battery SOC value, so that the DC-DC converter boosts the voltage to the preset rated voltage according to a preset slope, and sending a high-voltage power-on command to the auxiliary load of the car corresponding to the minimum battery SOC value, so that the auxiliary load starts;

When a power-on success signal fed back by the auxiliary load of the compartment corresponding to the minimum battery SOC value is received, it is determined that the compartment extended power supply corresponding to the minimum battery SOC value is successful.

5. The vehicle according to claim 4, characterized in that the vehicle control unit is also used for:

After the expansion power supply of the carriage corresponding to the minimum battery SOC value is successful, controlling the carriage corresponding to the minimum battery SOC value to stop the expansion power supply;

After the extended power supply to the carriage corresponding to the minimum battery SOC value stops, the extended power supply contactor to the carriage corresponding to the minimum battery SOC value is controlled to be disconnected, and the extended power supply contactor to the carriage corresponding to the maximum battery SOC value is controlled to be disconnected.

6. The vehicle according to claim 5, characterized in that the vehicle control unit controls the minimum battery SOC value to stop the extended power supply to the compartment, specifically comprising:

Sending an extended power supply stop instruction to the DC-DC converter and the auxiliary load of the carriage corresponding to the minimum battery SOC value, so as to unload the DC-DC converter and the auxiliary load;

Upon receiving the unloading success signal fed back by the DC-DC converter and the auxiliary load, sending an extended power supply stop instruction to the battery management controller of the compartment corresponding to the minimum battery SOC value, so that the battery management controller controls the corresponding DC-DC converter branch and the auxiliary load branch to be connected;

When receiving the auxiliary power-on success signal fed back by the battery management controller of the car corresponding to the minimum battery SOC value, a high-voltage power-on instruction is sent to the DC-DC converter and auxiliary load of the car corresponding to the minimum battery SOC value, so that the DC-DC converter starts the step-down mode and the auxiliary load is started.

7. The vehicle according to claim 6, characterized in that the auxiliary positive contactor is connected in parallel with a pre-charging resistor and an auxiliary pre-charging contactor connected in series, and the battery management controller controls the corresponding DC-DC converter branch and the auxiliary load branch to be connected, specifically including:

Controlling the auxiliary positive contactor, the auxiliary negative contactor, and the auxiliary pre-charge contactor to close;

Delaying a first preset time, controlling the auxiliary pre-charging contactor to disconnect.

8. A vehicle power supply method, applied to the vehicle according to claim 1, characterized in that the vehicle includes a whole vehicle through-line and M carriages, M is an integer greater than 1, the whole vehicle through-line includes a first line and a second line that run through the whole vehicle, each carriage includes a battery management controller, a power battery assembly and a plurality of load branches, the battery management controller is used to obtain the battery SOC value of the corresponding power battery assembly, each of the load branches is connected in parallel at both ends of the corresponding power battery assembly, and the plurality of load branches include a DC-DC converter branch, the DC-DC converter branch includes a DC-DC converter and an extended power supply contactor, the first DC end of the DC-DC converter is connected in parallel at both ends of the corresponding power battery assembly, and the second DC end of the DC-DC converter is connected to the first line and the second line through the corresponding extended power supply contactor; the method includes:

When the first difference is greater than a first preset value, the power battery assembly of the compartment corresponding to the maximum battery SOC value is controlled to supply power to the vehicle through-line, and power is supplied to the compartment corresponding to the minimum battery SOC value through the vehicle through-line.

9. The vehicle power supply method according to claim 8, characterized in that the controlling the power battery assembly of the compartment corresponding to the maximum battery SOC value to supply power to the vehicle through-line comprises:

Controlling the extended power supply contactor of the carriage corresponding to the maximum battery SOC value to close, and sending a high-voltage power-on instruction to the DC-DC converter of the carriage corresponding to the maximum battery SOC value, so that the DC-DC converter starts the step-down mode;