Electric vehicle power supply method

Abstract

The invention provides an electric vehicle power supply method which comprises the steps that a discharge interface is inserted into a power supply interface of a discharge vehicle to complete connection confirmation, power is supplied to a controller through the discharge vehicle, and the controller is awakened; the controller sends a self-checking instruction to the BMS of the discharging vehicle; after the BMS of the discharging vehicle receives the self-checking instruction sent by the controller, a power battery of the discharging vehicle and a power supply interface of the discharging vehicle are controlled to be connected, self-checking is conducted, and a self-checking result is sent to the controller; and the controller receives a self-inspection qualified message sent by the BMS of the discharging vehicle, receives the power utilization interface connection signal, and sends a charging instruction to the BMS of the discharging vehicle and / or the converter after receiving a charging starting instruction. The device has the advantages that the discharging vehicle is used for supplying power to the controller, so that the connecting device is simple in structure, and the controller and the BMS of the charging vehicle are conveniently awakened; when DC charging is carried out on the charging vehicle, power can be supplied to the BMS of the charging vehicle, and the low-voltage power supply state of the charging vehicle does not need to be considered.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a method for supplying power to an electric vehicle. Background Art

[0002] The whole vehicle test of electric vehicles requires continuous software version upgrades. After the upgrade, more than 100 test items need to be completed, including AC charging, DC charging, and scheduled charging. Each software version test requires 5-10 charge and discharge cycles, and a development cycle repeats the charge and discharge operations at least 200 times. When an electric vehicle is doing a charging test, after the battery pack is fully charged, it is necessary to drive the electric vehicle to consume power, which consumes the vehicle's power to about 20%. Not only is the work efficiency low, but it also wastes manpower and energy.

[0003] On the other hand, there is range anxiety when driving an electric vehicle. With the development and rapid popularization of electric vehicles, consumers are increasingly anxious about the range of electric vehicles. When an electric vehicle is driven in an area with few charging facilities, such as on a highway or ordinary road, and the SOC (State of Charge) of the electric vehicle is less than 10%, the driver will have range anxiety. When the vehicle's range reaches zero, the driver can only stop on the roadside and ask for a tow truck to help. Even if a tow truck is used for rescue, there are still problems of long waiting time and high cost.

[0004] In addition, in daily life, such as when camping in the wild, there is also a need to power the electric oven. Therefore, it is necessary to design a system to draw power from the power battery of the electric vehicle to provide power to other low-power electric vehicles or daily electrical equipment. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for powering an electric vehicle, which uses a discharging vehicle to power a controller, so that the structure of the connection device is simple and it is convenient to wake up the controller and the BMS of the charging vehicle.

[0006] The present invention solves the technical problem by adopting the following technical solution:

[0007] A method for powering an electric vehicle, connecting a discharge vehicle and an electric device through a connection device, the connection device comprising a discharge interface, a power interface and a distribution box, the distribution box being provided with a converter and a controller, the converter being configured to convert the output power of a power battery of the discharge vehicle into a power supply that can be used by the electric device; the discharge interface and the power interface are respectively connected to the input end and the output end of the converter;

[0008] The method is executed by a controller and comprises the following steps:

[0009] Step 1: Insert the discharge interface into the power supply interface of the discharge vehicle to complete the connection confirmation, and power the controller through the discharge vehicle to wake up the controller;

[0010] Step 2: The controller sends a self-test command to the BMS of the discharging vehicle;

[0011] Step 3: After receiving the self-test instruction sent by the controller, the BMS of the discharge vehicle controls the connection between the power battery of the discharge vehicle and the power supply interface of the discharge vehicle, performs a self-test, and sends the self-test result to the controller; the self-test result of the discharge vehicle includes the insulation status of the discharge vehicle;

[0012] Step 4: After receiving the self-test pass message sent by the BMS of the discharging vehicle, the power interface connection signal, and the start charging instruction, the controller sends a charging instruction to the BMS of the discharging vehicle. After the BMS of the discharging vehicle receives the charging instruction sent by the controller, it controls the connection between the power battery of the discharging vehicle and the power supply interface of the discharging vehicle; and / or, the controller sends a charging instruction to the converter. After receiving the charging instruction, the converter connects the discharging interface and the power interface.

[0013] Furthermore, when the electrical equipment is a charging vehicle, the method also includes: when the controller receives a start charging instruction, it sends a charging instruction to the BMS of the charging vehicle; after the BMS of the charging vehicle receives the charging instruction sent by the controller, it controls the connection between the power battery of the charging vehicle and the power supply interface of the charging vehicle.

[0014] Furthermore, the method also includes: during the power supply of the discharge vehicle, the BMS of the discharge vehicle periodically confirms the connection status; and / or during the power supply of the discharge vehicle, the BMS of the discharge vehicle periodically performs self-inspection to prevent the risk of leakage and improve safety.

[0015] Furthermore, when the discharge interface is inserted into the power supply interface of the discharge vehicle, the CC1 contact and CC2 contact of the discharge vehicle are respectively connected to the CC1 contact and CC2 contact of the discharge interface, so that the HVIL device of the BMS of the discharge vehicle and the controller form an HVIL interlocking loop, making the connection confirmation between the discharge interface and the power supply interface of the discharge vehicle simple, reliable and highly safe.

[0016] Furthermore, when the discharge interface is a first DC charging interface and the power interface is a second DC charging interface, the method also includes: inserting the power interface into a power supply interface of a charging vehicle, supplying power to the BMS of the charging vehicle through the discharge vehicle, waking up the BMS of the charging vehicle, and completing connection confirmation. There is no need to consider the low-voltage power supply status of the charging vehicle, and DC charging is more convenient.

[0017] Further, the discharge interface is a first DC charging interface, the power interface is a second DC charging interface, the converter includes a DC-DC booster, the DC-DC booster includes an inductor L, a diode VD1 and a capacitor C connected in series in sequence, the capacitor C is connected in parallel with a switch K5, and the switch K5 is electrically connected to a controller, and the method further includes:

[0018] In step 2, after receiving the signal that the second DC charging interface is connected to the charging vehicle, the controller sends a self-test instruction to the BMS of the discharging vehicle, controls the switch K5 to be disconnected, and sends a self-test instruction to the BMS of the charging vehicle; after receiving the self-test instruction sent by the controller, the BMS of the charging vehicle controls the connection between the power battery of the charging vehicle and the power supply interface of the charging vehicle;

[0019] In step 4, after the controller receives the self-test qualified message sent by the BMS of the discharging vehicle, receives the power interface connection signal, and receives the start charging instruction, it sends a charging instruction to the BMS and converter of the discharging vehicle. The BMS of the discharging vehicle controls the connection between the power battery of the discharging vehicle and the power supply interface of the discharging vehicle. The controller controls the switch K5 to switch to the normal working mode, and controls the switch K5 to open and close periodically, so that the DC-DC booster outputs a charging voltage that is compatible with the charging vehicle.

[0020] Furthermore, the DC-DC booster also includes a discharge resistor R0 connected in parallel with the capacitor C via a switch K6, which is used to discharge the electric energy stored in the converter after charging is completed, thereby improving safety.

[0021] Furthermore, during the power supply of the discharge vehicle, the controller controls the switch K5 to switch to the normal operating mode for the operation time t1, and then disconnects the switch K5 for the time t2, so that the discharge vehicle performs a self-check. After the self-check is completed, the switch K5 is controlled to switch to the normal operating mode for the operation time t1, and this cycle is repeated to perform real-time insulation monitoring of the high-voltage line throughout the entire process, thereby improving safety and charging efficiency.

[0022] Furthermore, when the discharge interface is a first DC charging interface and the power interface is an AC charging interface or a socket, the converter includes a DC-AC inverter, and the distribution box is provided with a switch K7 and / or a switch K8 electrically connected to the controller for connecting the inverter to the power interface; preferably, the switch K7 and the switch K8 are physical switches provided in the distribution box to improve the safety of power use.

[0023] Furthermore, the BMS of the discharging vehicle sends the SOC of the discharging vehicle to the controller. When the initial SOC sent by the BMS of the discharging vehicle received by the controller is not less than a first threshold, the controller receives a start charging instruction and sends a charging instruction to the BMS of the discharging vehicle; preferably, the first threshold is one of 40%-60%, ensuring that the discharging vehicle has a certain amount of electrical power supply.

[0024] Furthermore, a charging stopping method is also included, and the charging stopping method comprises the following steps:

[0025] Step 51: The controller receives a stop charging instruction and sends a stop charging instruction to the BMS of the discharging vehicle; or,

[0026] The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle, and when the real-time SOC sent by the BMS of the discharging vehicle received by the controller is less than or equal to the second threshold, the controller sends a stop charging instruction to the BMS of the discharging vehicle; or,

[0027] The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle and the charging vehicle respectively. When the real-time SOC sent by the BMS of the discharging vehicle received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charging vehicle received by the controller is greater than or equal to the third threshold value, the controller sends a stop charging instruction to the BMS of the discharging vehicle and the BMS of the charging vehicle; or,

[0028] The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle and the charging vehicle respectively. When the real-time SOC sent by the BMS of the discharging vehicle received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charging vehicle received by the controller is equal to the real-time SOC sent by the BMS of the discharging vehicle, the controller sends a stop charging instruction to the BMS of the discharging vehicle and the BMS of the charging vehicle;

[0029] Step 52: After the BMS of the discharging vehicle receives the stop charging instruction sent by the controller, it controls the disconnection of the power battery of the discharging vehicle and the power supply interface of the discharging vehicle; when the BMS of the charging vehicle receives the stop charging instruction sent by the controller, it controls the disconnection of the power battery of the charging vehicle and the power supply interface of the charging vehicle.

[0030] Further, the second threshold is one of 20%-30%, or the second threshold is 1 / 2 of the first threshold; the third threshold is one of 20%-30%.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The controller is powered by the discharging vehicle, which simplifies the structure of the connection device and facilitates waking up the controller and the BMS of the charging vehicle. When the charging vehicle is DC charged, the BMS of the charging vehicle can also be powered without considering the low-voltage power supply status of the charging vehicle.

[0033] (2) By discharging the vehicle itself to perform insulation self-test, the structure of the connection device is further simplified, making the connection device compact, easy to carry and move, and reducing the cost of the connection device.

[0034] (3) During the entire charging process, the discharging vehicle periodically performs connection confirmation and insulation self-inspection to improve safety.

[0035] (4) When discharging stops, the discharging vehicle retains a certain amount of power so that the discharging vehicle can travel normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of the present invention in which a discharging vehicle performs DC charging on a charging vehicle.

[0037] Figure 2 It is a structural schematic diagram of the present invention that a discharging vehicle performs AC charging on a charging vehicle.

[0038] In the figure: 100 - discharge vehicle; 101 - power supply interface of the discharge vehicle; 102 - power battery of the discharge vehicle; 200 - distribution box; 201 - discharge interface; 202 - power interface; 203 - DC-DC booster; 300 - charging vehicle; 301 - power supply interface of the charging vehicle; 302 - power battery of the charging vehicle. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0040] In the description of the present invention, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "and / or" when used to list two or more items means that any one of the listed items can be adopted, or any combination of two or more of the listed items can be adopted.

[0041] The present invention provides a method for supplying power to an electric vehicle, referring to Figure 1 and Figure 2As shown, the discharge vehicle 100 is connected to the electrical equipment through a connection device, the connection device includes a discharge interface 201, a power interface 202 and a distribution box 200, the distribution box 200 is provided with a converter and a controller, the converter is configured to convert the output power of the power battery 102 of the discharge vehicle into a power supply that can be used by the electrical equipment; the discharge interface 201 and the power interface 202 are respectively connected to the input end and the output end of the converter;

[0042] The method is executed by a controller and comprises the following steps:

[0043] Step 1: The discharge interface 201 is inserted into the power supply interface 101 of the discharge vehicle to complete the connection confirmation, and the controller is powered by the discharge vehicle 100 to wake up the controller;

[0044] Step 2: The controller sends a self-test instruction to the BMS of the discharging vehicle 100;

[0045] Step 3: After receiving the self-test instruction sent by the controller, the BMS of the discharge vehicle 100 controls the connection between the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle, performs a self-test, and sends the self-test result to the controller; the self-test result of the discharge vehicle 100 includes the insulation state of the discharge vehicle 100;

[0046] Step 4: After receiving the self-test qualified message sent by the BMS of the discharge vehicle 100, receiving the connection signal of the power interface 202, and receiving the start charging instruction, the controller sends a charging instruction to the BMS of the discharge vehicle 100. After the BMS of the discharge vehicle 100 receives the charging instruction sent by the controller, it controls the connection between the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle; and / or, the controller sends a charging instruction to the converter. After receiving the charging instruction, the converter connects the discharge interface 201 and the power interface 202.

[0047] When the power battery 102 of the discharge vehicle outputs electric energy, it is preferred to use a DC (direct current) power supply interface for output, and the discharge interface 201 is set as a first DC charging interface, which is connected to the DC power supply interface of the discharge vehicle 100. The power interface 202 can be set as a second DC charging interface, which is connected to the DC power supply interface of the charging vehicle 300, and the converter includes a DC-DC booster 203; and / or, the power interface 202 can also be set as an AC (alternating current) charging interface or socket, the converter includes a DC-AC inverter, the AC charging interface is connected to the AC power supply interface of the charging vehicle 300, and the socket is connected to the plug of daily electrical equipment. The discharge interface 201 and the power interface 202 use interfaces that comply with relevant national standards, foreign standards or industry standards. The discharge interface 201 and the power supply interface 101 of the discharge vehicle are matching plugs or sockets. For example, the first DC charging interface and the second DC charging interface can use a DC charging plug that complies with "GB / T 20234.3-2023 Electric Vehicle Conductive Charging Connection Device Part 3: DC Charging Interface", and have the following contacts: DC power supply DC+, DC-; ground wire PE; charging communication CAN H (S+), CAN L (S-); charging connection confirmation CC1, CC2; low-voltage auxiliary power supply A+, A-. The contacts of the discharge interface 201 are connected to the contacts of the power supply interface 101 of the discharge vehicle to form a corresponding circuit. The second DC charging interface and the AC charging interface are plugs or sockets that match the power supply interface 301 of the charging vehicle. For example, the AC charging interface can use an AC charging plug that complies with "GB / T20234.2-2015 Connection device for conductive charging of electric vehicles Part 2: AC charging interface", and has the following contacts: single AC power supply L1; three-phase AC power supply L2, L3; neutral line N; ground line PE; charging connection confirmation line CC; control guide CP. The various contacts of the AC charging interface are connected to the various contacts of the power supply interface 301 of the charging vehicle to form a corresponding circuit. In the following, for the convenience of description, the first DC charging interface, the second DC charging interface and the AC charging interface are described as complying with national standards.

[0048] The BMS (Battery Management System) of the discharge vehicle 100 is in a long power supply state. When the discharge interface 201 is inserted into the power supply interface 101 of the discharge vehicle, the BMS of the discharge vehicle 100 is awakened, and the low-voltage power supply of the discharge vehicle 100 is connected to the contacts A+ and A- of the discharge interface 201, so that the controller is powered by the low-voltage power supply of the discharge vehicle 100. For example, the 12V battery of the discharge vehicle 100 provides a 12V voltage to the controller to wake up the controller. In this way, the controller is powered by the discharge vehicle 100, avoiding the need to set a power supply in the connection device to power the controller, and the structure of the connection device can be simplified. The controller and the BMS of the discharge vehicle 100 can communicate with each other through the CAN H (S+) and CAN L (S-) lines.

[0049] When the discharge vehicle 100 is powered by DC, the power supply interface 101 of the discharge vehicle provides high voltage electricity of about 380V. In order to improve the safety of use, it is necessary to perform insulation detection on the discharge vehicle 100. According to "GB18384-2020 Safety Requirements for Electric Vehicles", electric vehicles should have an insulation resistance monitoring function. Therefore, insulation self-inspection can be performed through the insulation monitoring device of the discharge vehicle 100 itself, further simplifying the structure of the connection device, making the connection device compact, easy to carry and move, and reducing the cost of the connection device. It can be understood that the carrier form of the vehicle's insulation detection device and the vehicle's BMS is not limited, and can be an independent module or integrated with other functional modules.

[0050] In order to improve the safety of use and prevent the power loss of the discharge vehicle 100, the controller receives the self-test qualified message sent by the BMS of the discharge vehicle 100, receives the start charging instruction, and receives the connection signal of the power interface 202, and then the controller issues a charging instruction. When the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle are controlled by controlling the connection and disconnection of the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle, the controller sends a charging instruction to the BMS of the discharge vehicle 100. After the BMS of the discharge vehicle 100 receives the charging instruction sent by the controller, it controls the connection between the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle. For example, by turning on and off the switch K1 and the switch K2 of the discharge vehicle 100, the connection and disconnection of the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle can be controlled. When the on / off connection between the power battery 102 of the discharge vehicle and the power interface 202 can be controlled by the converter, the controller sends a charging instruction to the converter. After receiving the charging instruction, the converter connects the discharge interface 201 and the power interface 202, thereby connecting the power battery 102 of the discharge vehicle and the power interface 202. Of course, the on / off connection between the power battery 102 of the discharge vehicle and the power interface 202 can also be controlled by the converter and by controlling the on / off connection between the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle.

[0051] Preferably, after the self-test is completed, for safety reasons, the BMS of the discharge vehicle 100 controls the disconnection of the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle. When the BMS of the discharge vehicle 100 receives the charging instruction sent by the controller, it controls the connection of the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle.

[0052] The power interface 202 can be set as a second DC charging interface, and the converter includes a DC-DC booster 203. After the DC power output by the discharge vehicle 100 is boosted, the charging vehicle 300 is charged in a DC charging mode. For example, the DC-DC booster 203 boosts the 380V DC power provided by the power supply interface of the discharge vehicle 100 to about 400V for DC fast charging of the charging vehicle 300. The SOC of the charging vehicle 300 can reach about 20% within 15-20 minutes (when using a charging pile to charge an electric vehicle, it can be fully charged in about 1 hour). The charging efficiency is high, and the electric energy can be quickly transferred to achieve rapid emergency rescue.

[0053] The power interface 202 can also be set as an AC charging interface or socket, and the converter includes a DC-AC inverter. The DC-AC inverter converts the direct current output by the discharge vehicle 100 into the alternating current required by the charging vehicle 300, for example, converts the high voltage electricity of about 380V provided by the power supply interface 101 of the discharge vehicle into 220V, 16A alternating current, and then charges the charging vehicle 300 in the AC charging mode, so as to solve the problem that the electric vehicle or hybrid vehicle cannot be started due to low power, or provide power for daily electrical equipment, and can provide sufficient power for daily electrical equipment to meet the power requirements of daily electrical equipment.

[0054] The connection device is provided with at least one power interface 202, and multiple power interfaces 202 may also be provided at the same time. For example, when the second DC charging interface and the AC charging interface are provided at the same time, the DC-DC booster 203 and the DC-AC inverter are connected in parallel in the distribution box 200, the second DC charging interface is connected to the output end of the DC-DC booster 203, and the AC charging interface is connected to the output end of the DC-AC inverter. When the AC charging interface and the socket are provided at the same time, the AC charging interface and the socket are connected in parallel to the output end of the DC-AC inverter. The settings of the power interface 202 can be combined as needed, and will not be described one by one here. The discharge interface 201 and the power interface 202 can be designed as an integral part of the distribution box 200, or they can be designed as detachable. When the power interface 202 is a socket, preferably, the socket can be fixedly provided on the distribution box 200, so that the socket is fixed stably and reliably. When in use, preferably, one can be selected as needed to avoid charging current shunting, reduce charging efficiency, and improve safety.

[0055] When the power-consuming device is a charging vehicle 300, the method further includes: when the controller receives the start charging instruction, it sends a charging instruction to the BMS of the charging vehicle 300; after the BMS of the charging vehicle 300 receives the charging instruction sent by the controller, it controls the connection between the power battery 302 of the charging vehicle and the power supply interface 301 of the charging vehicle. When the charging vehicle 300 is DC charged, the discharging vehicle 100 charges the power battery 302 of the charging vehicle. For example, the connection and disconnection of the power battery 302 of the charging vehicle and the power supply interface 301 of the charging vehicle can be controlled by turning on and off the switch K3 and the switch K4 of the charging vehicle 300. When the charging vehicle 300 is AC charged, the on-board charger of the discharging vehicle 100 and the charging vehicle 300 is connected to charge the power battery 302 of the charging vehicle.

[0056] In order to improve safety, during the power supply of the discharge vehicle 100, the BMS of the discharge vehicle 100 periodically confirms the connection status; and / or, during the power supply of the discharge vehicle 100, the BMS of the discharge vehicle 100 periodically performs self-inspection to keep the power supply interface 101 of the discharge vehicle and the discharge interface 201 firmly and reliably connected, and performs real-time insulation monitoring of the discharge vehicle 100 to prevent the risk of leakage.

[0057] Specifically, when the discharge interface 201 is inserted into the power supply interface 101 of the discharge vehicle, the CC1 contact and CC2 contact of the discharge vehicle 100 are respectively connected to the CC1 contact and CC2 contact of the discharge interface 201, so that the HVIL (High Voltage Inter-lock) device of the BMS of the discharge vehicle 100 and the controller form an HVIL interlocking loop, and the connection status is confirmed through the HVIL interlocking. Specifically, when the CC1 contact and CC2 contact of the discharge vehicle 100 are respectively connected to the CC1 contact and CC2 contact of the discharge interface 201, the CC1 line and the CC2 line are connected, and the signal of the HVIL device of the BMS of the discharge vehicle 100 is returned to the signal detection terminal B of the HVIL device of the BMS of the discharge vehicle 100 from the signal source A through the CC1 line, the controller and the CC2 line in sequence. When the discharge interface 201 is inserted into the power supply interface 101 of the discharge vehicle, the CC1 line is finally connected, and the connection can be confirmed by the signal detected by the signal detection terminal B. When the discharge interface 201 is not fully connected to the power supply interface 101 of the discharge vehicle, the signal detected by the signal detection terminal B is displayed as 0. When the discharge interface 201 is fully connected to the power supply interface 101 of the discharge vehicle, the signal detected by the signal detection terminal B is displayed as 1.

[0058] During charging, the signal source A of the BMS of the discharge vehicle 100 periodically sends a signal to the signal detection terminal B. For example, the signal source A sends a signal to the signal detection terminal B every 15 seconds or 30 seconds, and the connection status during charging can be continuously monitored. When the signal detection terminal B cannot detect signal 1, the BMS of the discharge vehicle 100 controls the disconnection of switches K1 and K2 to interrupt the output of high voltage electricity. In this way, the connection confirmation between the discharge interface 201 and the power supply interface 101 of the discharge vehicle is carried out through the HVIL interlocking circuit formed by the HVIL device of the BMS of the discharge vehicle 100 and the controller, which is simple, reliable and highly safe.

[0059] When the power interface 202 is set to the second DC charging interface, the connection confirmation method between the second DC charging interface and the DC power supply interface of the charging vehicle 300 is the same as the connection confirmation method of the discharge interface 201, and the connection confirmation is performed by forming an HVIL interlock with the controller through the signal source A and signal detection terminal B of the BMS of the charging vehicle 300.

[0060] When the power interface 202 is set as an AC charging interface, the connection confirmation between the AC charging interface and the AC power supply interface of the charging vehicle 300 can be carried out according to "GB / T 18487.1-2023 Electric Vehicle Conductive Charging System Part 1: General Requirements", for example, refer to Figure 2 As shown, the control guidance circuit includes a selection switch S1, resistors R1, R2, R3, R4, R5, a diode VD2, switches K9, and K10. Switch K10 is a normally closed switch set in the AC charging interface. When the AC charging interface is connected to the AC power supply interface of the charging vehicle 300, the selection switch S1 is connected to the 12V contact, and the voltage of the detection point P2 is 9V. When the switch K9 is closed, the voltage of the detection point P2 is 6V, indicating that the AC charging interface is fully connected to the AC power supply interface of the charging vehicle 300 and can be charged. Alternatively, the resistance value between the detection point P3 and PE is measured to determine whether the AC charging interface is fully connected to the AC power supply interface of the charging vehicle 300.

[0061] When the discharge interface 201 is a first DC charging interface and the power interface 202 is a second DC charging interface, the method further includes: inserting the power interface 202 into the power supply interface 301 of the charging vehicle, supplying power to the BMS of the charging vehicle 300 through the discharge vehicle 100, waking up the BMS of the charging vehicle 300, and completing the connection confirmation. Figure 1 As shown, when the charging vehicle 300 is DC charged, the BMS of the charging vehicle 300 is awakened through the A+ line and the A- line, and the BMS of the charging vehicle 300 can also be powered by the discharging vehicle 100. There is no need to consider the low-voltage power supply state of the charging vehicle 300. Even if the battery of the charging vehicle 300 is exhausted, DC charging can be performed through the discharging vehicle 100, which makes charging more convenient.

[0062] The discharge interface 201 is a first DC charging interface, the power interface 202 is a second DC charging interface, the converter includes a DC-DC booster 203, the DC-DC booster 203 includes an inductor L, a diode VD1 and a capacitor C connected in series, the capacitor C is connected in parallel with a switch K5, and the switch K5 is electrically connected to the controller, and the method further includes:

[0063] In step 2, after receiving the signal that the second DC charging interface is connected to the charging vehicle 300, the controller sends a self-test instruction to the BMS of the discharging vehicle 100, controls the switch K5 to be disconnected, and sends a self-test instruction to the BMS of the charging vehicle 300; after receiving the self-test instruction sent by the controller, the BMS of the charging vehicle 300 controls the connection between the power battery 302 of the charging vehicle and the power supply interface 301 of the charging vehicle;

[0064] In step 4, after receiving the self-test qualified message sent by the BMS of the discharge vehicle 100, receiving the connection signal of the power interface 202, and receiving the start charging instruction, the controller sends a charging instruction to the BMS and converter of the discharge vehicle 100, and the BMS of the discharge vehicle 100 controls the connection between the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle. The controller controls the switch K5 to switch to the normal working mode, and controls the switch K5 to open and close periodically, so that the DC-DC booster 203 outputs a charging voltage adapted to the charging vehicle 300.

[0065] When the charging vehicle 300 is DC charged and the discharging vehicle 100 performs a self-test, the switch K5 is kept disconnected, and the switch K5 can use a normally open switch. When the switch K5 is disconnected, and the power battery 102 of the discharging vehicle is connected to its power supply interface, and the power battery 302 of the charging vehicle is connected to its power supply interface, the power battery 102 of the discharging vehicle is connected to the power battery 302 of the charging vehicle, and the discharging vehicle 100 performs an insulation self-test through the insulation monitoring device set in the vehicle, and the converter and the charging vehicle 300 are simultaneously tested for insulation, so as to realize the insulation test of the high-voltage line between the power battery 102 of the discharging vehicle-the power supply interface 101 of the discharging vehicle-the discharging interface 201-the booster-the second DC charging interface-the power supply interface 301 of the charging vehicle-the power battery 302 of the charging vehicle, thereby improving the insulation safety during DC charging.

[0066] When the converter is a DC-DC booster 203, when charging is finished, some electric energy is still stored in the converter (inductor L and capacitor C). Figure 1 As shown, the capacitor C can be connected in parallel with the discharge resistor R0 through the switch K6, so that part of the electric energy is converted into heat energy through the discharge resistor R0 for consumption, thereby improving safety.

[0067] When the power interface 202 is the second DC charging interface and the charging vehicle 300 is DC charged, the controller controls the switch K5 to switch to the normal working mode for the operation time t1 during the power supply of the discharge vehicle 100, and then disconnects the switch K5 for the time t2, so that the discharge vehicle 100 performs a self-test. After the self-test is completed, the switch K5 is controlled to switch to the normal working mode for the operation time t1, and this cycle is repeated. When the switch K5 of the DC-DC booster 203 is switched to the normal working mode, the switch K5 is periodically opened and closed to charge the charging vehicle 300. After the switch K5 is periodically opened and closed for the time t1, it is switched to the self-test mode and the switch K5 is disconnected for the time t2. When the switch K5 is in the normal working mode, the disconnection time t2′ of an opening and closing cycle is less than the disconnection time t2 during the self-test. When the discharge vehicle 100 self-tests, the disconnection time of the switch K5 can be extended, and the time of disconnecting the switch K5 is extended to t2. After the self-test is completed, the switch K5 is periodically opened and closed to charge the charging vehicle 300. In this way, by controlling the opening and closing of the switch K5 of the DC-DC booster 203, the insulation monitoring device in the discharge vehicle 100 can be used to perform real-time insulation monitoring of the high-voltage line between the power battery 102 of the discharge vehicle and the power battery 302 of the charging vehicle, and it does not affect the normal charging process, thereby improving safety and charging efficiency. For example, after the switch K5 is periodically opened and closed for 10-30s, it is disconnected for 0.1-1s for insulation detection, and then periodically opened and closed for 10-30s, and then disconnected for 0.1-1s for insulation detection, and this cycle is repeated until charging stops. It can be understood that time t1 and t2 can be adjusted according to actual needs. For example, time t1 can be set to 10s, 15s, 20s, 25s, 30s, etc., and time t2 can be set to 0.1s, 0.2s, 0.3s, 0.4s, 0.5s, 0.6s, 0.7s, 0.8s, 0.9s, 1s, etc.

[0068] refer to Figure 2 As shown, when the discharge interface 201 is a first DC charging interface and the power interface 202 is an AC charging interface or a socket, the converter includes a DC-AC inverter, and the distribution box 200 is provided with a switch K7 and / or a switch K8 electrically connected to the controller, for connecting the inverter and the power interface 202; preferably, the switch K7 and the switch K8 are physical switches arranged in the distribution box 200.

[0069] The switch K7 and the switch K8 are electrically connected to the controller. When the power interface 202 is an AC charging interface, when the AC charging interface is inserted into the power supply interface 301 of the charging vehicle, the charging connection confirmation line CC establishes communication with the controller, so that the controller receives the connection signal of the power interface 202. When the controller receives the charging instruction, the switch K7 and the switch K8 are controlled to be closed, and the inverter and the power interface 202 are connected. When the power interface 202 is a socket, the switch K7 and / or the switch K8 are set as physical switches set in the distribution box 200. The switch K7 and the switch K8 are manually closed, and the controller receives the signal that the switch K7 and the switch K8 are closed, indicating that the power interface 202 is connected to the power device. The controller sends a charging instruction to the BMS of the discharge vehicle 100 to supply power to the power device, thereby improving the safety of power consumption. Of course, when the power interface 202 is an AC charging interface, the switch K7 and the switch K8 can also be manually closed to indicate that the power interface 202 is connected to the power device.

[0070] In order to improve safety, an emergency stop button can also be set on the distribution box 200. When an abnormality occurs, the emergency stop button can be pressed to directly disconnect the connection between the discharge interface 201 and the converter. The emergency stop button is electrically connected to the controller. When the emergency stop button is pressed, the controller simultaneously issues a stop charging instruction to execute the stop charging operation.

[0071] When the power interface 202 is an AC charging interface, the discharge vehicle 100 can periodically perform insulation testing when AC charging is performed for the charging vehicle 300. By connecting the power battery 102 of the discharge vehicle and the power supply interface 101 of the discharge vehicle, the power battery 102 of the discharge vehicle and the DC part of the DC-AC inverter can be connected. When the discharge vehicle 100 performs insulation self-test through the insulation monitoring device arranged in the vehicle, the discharge interface 201 and the DC part of the converter are simultaneously tested for insulation, so as to realize the insulation test of the high-voltage line between the power battery 102 of the discharge vehicle-the power supply interface 101 of the discharge vehicle-the discharge interface 201-the DC part of the inverter, thereby improving the insulation safety.

[0072] In order to enable the discharge vehicle 100 to still be able to drive normally after supplying power to the electrical equipment, it is necessary to enable the discharge vehicle 100 to have at least a certain amount of power to charge the charging vehicle 300 or for daily electrical equipment, and to retain some power after supplying power, so that the discharge vehicle 100 can drive normally, and prevent the discharge vehicle 100 from consuming too much power, and causing mileage anxiety before finding charging facilities. The BMS of the discharge vehicle 100 sends the SOC of the discharge vehicle 100 to the controller. When the initial SOC sent by the BMS of the discharge vehicle 100 received by the controller is not less than the first threshold, the controller receives the start charging instruction and sends a charging instruction to the BMS of the discharge vehicle 100; preferably, the first threshold is one of 40%-60%, for example, the first threshold is 40%, 45%, 50%, 55%, 60%, etc. During charging, the initial SOC of the discharge vehicle 100 is not less than the first threshold. For example, when the first threshold is 40%, the initial SOC of the discharge vehicle 100 needs to reach 40% or more.

[0073] Stop charging. The controller may stop charging according to the stop charging instruction, or may stop charging according to the real-time SOC of the discharging vehicle 100 and the charging vehicle 300. At this time, the SOC of the discharging vehicle 100 needs to be retained first. Specifically, the charging stop method includes the following steps:

[0074] Step 51: The controller receives a stop charging instruction and sends a stop charging instruction to the BMS of the discharging vehicle 100; or,

[0075] The controller periodically receives the real-time SOC sent by the BMS of the discharge vehicle 100. When the real-time SOC sent by the BMS of the discharge vehicle 100 received by the controller is less than or equal to the second threshold, the controller sends a stop charging instruction to the BMS of the discharge vehicle 100, so that the discharge vehicle 100 retains a certain amount of power, and the power supply of the discharge vehicle 100 is not limited; or,

[0076] The controller periodically receives the real-time SOC sent by the BMS of the discharge vehicle 100 and the charge vehicle 300 respectively. When the real-time SOC sent by the BMS of the discharge vehicle 100 received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charge vehicle 300 received by the controller is greater than or equal to the third threshold value, the controller sends a stop charging instruction to the BMS of the discharge vehicle 100 and the BMS of the charge vehicle 300, so that the charge vehicle 300 is charged with a certain amount of electric energy to meet the rescue requirements, and then stops charging, which can meet the mileage requirements of the discharge vehicle 100 and the charge vehicle 300 at the same time; or,

[0077] The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle 100 and the charging vehicle 300 respectively. When the real-time SOC sent by the BMS of the discharging vehicle 100 received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charging vehicle 300 received is equal to the real-time SOC sent by the BMS of the discharging vehicle 100, the controller sends a stop charging instruction to the BMS of the discharging vehicle 100 and the BMS of the charging vehicle 300;

[0078] Step 52: After the BMS of the discharging vehicle 100 receives the stop charging instruction sent by the controller, it controls the disconnection between the power battery 102 of the discharging vehicle and the power supply interface 101 of the discharging vehicle; when the BMS of the charging vehicle 300 receives the stop charging instruction sent by the controller, it controls the disconnection between the power battery 302 of the charging vehicle and the power supply interface 301 of the charging vehicle.

[0079] Specifically, the second threshold is one of 20%-30%, and the third threshold is one of 20%-30%. For example, the second threshold and the third threshold can be set to 20%, 22%, 25%, 28%, 30%, etc. Or the second threshold can be set to 1 / 2 of the first threshold. For example, when the first threshold is set to 40%, the second threshold is set to 20%; when the first threshold is set to 50%, the second threshold is set to 25%.

[0080] The start charging instruction and the stop charging instruction can be input through a physical switch set on the distribution box 200, or can be input through a touch screen switch. Specifically, a display can be set on the distribution box 200, and the display can display the self-test status and SOC of the discharge vehicle 100 and the charging vehicle 300; the display is provided with a discharge control key, and the discharge control key is electrically connected to the controller, and is used to send a start charging instruction or a stop charging instruction to the controller. For example, a "Confirm Charging\Stop Charging" control key is set, and "Confirm Charging" is clicked on the screen to send a start charging instruction to the controller, and "Stop Charging" is clicked on the screen to send a stop charging instruction to the controller, and the discharge vehicle 100 stops discharging, realizing manual discharge control and improving safety.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for powering an electric vehicle, characterized in that: Connecting the discharge vehicle and the power-consuming device through a connection device, the connection device comprising a discharge interface, a power-consuming interface and a distribution box, the distribution box being provided with a converter and a controller, the converter being configured to convert the output power of the power battery of the discharge vehicle into a power supply that can be used by the power-consuming device; The discharge interface and the power interface are connected to the input end and the output end of the converter respectively; The method is executed by a controller and comprises the following steps: Step 1: Insert the discharge interface into the power supply interface of the discharge vehicle to complete the connection confirmation, and power the controller through the discharge vehicle to wake up the controller; Step 2: The controller sends a self-test command to the BMS of the discharging vehicle; Step 3: After receiving the self-test instruction sent by the controller, the BMS of the discharge vehicle controls the connection between the power battery of the discharge vehicle and the power supply interface of the discharge vehicle, performs a self-test, and sends the self-test result to the controller; the self-test result of the discharge vehicle includes the insulation status of the discharge vehicle; Step 4: After receiving the self-test pass message sent by the BMS of the discharging vehicle, the power interface connection signal, and the start charging instruction, the controller sends a charging instruction to the BMS of the discharging vehicle. After the BMS of the discharging vehicle receives the charging instruction sent by the controller, it controls the connection between the power battery of the discharging vehicle and the power supply interface of the discharging vehicle; and / or, the controller sends a charging instruction to the converter. After receiving the charging instruction, the converter connects the discharging interface and the power interface.

2. The method for supplying power to an electric vehicle according to claim 1, characterized in that: When the electrical device is a charging vehicle, the method further includes: when the controller receives a start charging instruction, it sends a charging instruction to the BMS of the charging vehicle; after the BMS of the charging vehicle receives the charging instruction sent by the controller, it controls the connection between the power battery of the charging vehicle and the power supply interface of the charging vehicle.

3. The method for supplying power to an electric vehicle according to claim 1, characterized in that: The method further includes: during the period of power supply of the discharge vehicle, the BMS of the discharge vehicle periodically confirming the connection status; and / or during the period of power supply of the discharge vehicle, the BMS of the discharge vehicle periodically performing self-inspection.

4. The method for supplying power to an electric vehicle according to claim 1 or 3, characterized in that: When the discharge interface is inserted into the power supply interface of the discharge vehicle, the CC1 contact and CC2 contact of the discharge vehicle are respectively connected to the CC1 contact and CC2 contact of the discharge interface, so that the HVIL device of the BMS of the discharge vehicle and the controller form an HVIL interlocking loop.

5. The method for supplying power to an electric vehicle according to claim 1, characterized in that: When the discharge interface is a first DC charging interface and the power interface is a second DC charging interface, the method further includes: inserting the power interface into a power supply interface of a charging vehicle, powering the BMS of the charging vehicle through the discharge vehicle, waking up the BMS of the charging vehicle, and completing connection confirmation.

6. The method for supplying power to an electric vehicle according to claim 1, characterized in that: The discharge interface is a first DC charging interface, the power interface is a second DC charging interface, the converter includes a DC-DC booster, the DC-DC booster includes an inductor L, a diode VD1 and a capacitor C connected in series, the capacitor C is connected in parallel with a switch K5, and the switch K5 is electrically connected to a controller, and the method further includes: In step 2, after receiving the signal that the second DC charging interface is connected to the charging vehicle, the controller sends a self-test instruction to the BMS of the discharging vehicle, controls the switch K5 to be disconnected, and sends a self-test instruction to the BMS of the charging vehicle; after receiving the self-test instruction sent by the controller, the BMS of the charging vehicle controls the connection between the power battery of the charging vehicle and the power supply interface of the charging vehicle; In step 4, after receiving the self-test qualified message sent by the BMS of the discharging vehicle, receiving the power interface connection signal, and receiving the start charging instruction, the controller sends a charging instruction to the BMS and converter of the discharging vehicle. The BMS of the discharging vehicle controls the connection between the power battery of the discharging vehicle and the power supply interface of the discharging vehicle. The controller controls the switch K5 to switch to the normal working mode, and controls the switch K5 to open and close periodically, so that the DC-DC booster outputs a charging voltage that is compatible with the charging vehicle.

7. The method for supplying power to an electric vehicle according to claim 6, characterized in that: The DC-DC booster further includes a discharge resistor R0 connected in parallel with the capacitor C via a switch K6.

8. The method for supplying power to an electric vehicle according to claim 6 or 7, characterized in that: During the power supply period of the discharge vehicle, the controller controls the switch K5 to switch to the normal working mode and run for time t1, then disconnects the switch K5 for time t2, so that the discharge vehicle performs a self-check. After the self-check is completed, the switch K5 is controlled to switch to the normal working mode and run for time t1, and this cycle is repeated.

9. The method for supplying power to an electric vehicle according to claim 1, characterized in that: When the discharge interface is a first DC charging interface and the power interface is an AC charging interface or a socket, the converter includes a DC-AC inverter, and the distribution box is provided with a switch K7 and / or a switch K8 electrically connected to the controller for connecting the inverter to the power interface; preferably, the switch K7 and the switch K8 are physical switches arranged in the distribution box.

10. The method for supplying power to an electric vehicle according to claim 1, characterized in that: The BMS of the discharging vehicle sends the SOC of the discharging vehicle to the controller. When the initial SOC sent by the BMS of the discharging vehicle received by the controller is not less than a first threshold, the controller receives a start charging instruction and sends a charging instruction to the BMS of the discharging vehicle; preferably, the first threshold is one of 40%-60%.

11. The method for supplying power to an electric vehicle according to claim 1 or 10, characterized in that: The charging stop method further comprises the following steps: Step 51: The controller receives a stop charging instruction and sends a stop charging instruction to the BMS of the discharging vehicle; or, The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle, and when the real-time SOC sent by the BMS of the discharging vehicle received by the controller is less than or equal to the second threshold, the controller sends a stop charging instruction to the BMS of the discharging vehicle; or, The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle and the charging vehicle respectively. When the real-time SOC sent by the BMS of the discharging vehicle received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charging vehicle received by the controller is greater than or equal to the third threshold value, the controller sends a stop charging instruction to the BMS of the discharging vehicle and the BMS of the charging vehicle; or, The controller periodically receives the real-time SOC sent by the BMS of the discharging vehicle and the charging vehicle respectively. When the real-time SOC sent by the BMS of the discharging vehicle received by the controller is not less than the second threshold value, and the real-time SOC sent by the BMS of the charging vehicle received by the controller is equal to the real-time SOC sent by the BMS of the discharging vehicle, the controller sends a stop charging instruction to the BMS of the discharging vehicle and the BMS of the charging vehicle; Step 52: After the BMS of the discharging vehicle receives the stop charging instruction sent by the controller, it controls the disconnection of the power battery of the discharging vehicle and the power supply interface of the discharging vehicle; when the BMS of the charging vehicle receives the stop charging instruction sent by the controller, it controls the disconnection of the power battery of the charging vehicle and the power supply interface of the charging vehicle.

12. The method for supplying power to an electric vehicle according to claim 11, characterized in that: The second threshold is one of 20%-30%, or the second threshold is 1 / 2 of the first threshold; the third threshold is one of 20%-30%.

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