Vehicle-mounted power supply system, vehicle, and control method for charging and discharging

Abstract

Embodiments of the present application provide a vehicle-mounted power supply system, a vehicle and a control method for charging and discharging. The vehicle-mounted power supply system comprises N+1 nodes, an alternating current charging port comprising a neutral line connector and N-phase alternating current connectors, the neutral line connector being electrically connected to one node, and the N-phase alternating current connectors being electrically connected to N nodes in one-to-one correspondence, a bidirectional alternating current-direct current converter comprising N+1 alternating current terminals and a direct current terminal, a battery pack electrically connected to the direct current terminal, a switch module comprising switch devices of the alternating current charging terminal and switch devices of N generator terminals, and a generator interface comprising N generator connectors. The embodiments of the present application can realize a range extending mode and a charging gun mode, have the advantages of improved power density, reduced device weight, reduced occupied space and easier arrangement of the system, and reuse the bidirectional alternating current-direct current converter to reduce the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted power supply, in particular to a vehicle-mounted power supply system, a vehicle and a control method of charging and discharging. BACKGROUND

[0002] New energy vehicles are more and more, and due to the immaturity of the charging facilities of electric vehicles, many places still cannot be charged, and pure electric vehicles cannot fully meet the demand. Therefore, range-extended electric vehicles are also increasing. The range-extended electric vehicle increases a range-extended system on the basis of the pure electric vehicle. The engine of the electric vehicle converts chemical energy into kinetic energy, and the generator converts kinetic energy into alternating current or converts alternating current into kinetic energy. The range-extended mode of the range-extended system can convert the kinetic energy of the engine into the alternating current of the generator, and then rectify the alternating current into direct current to charge the battery pack; or convert the direct current into alternating current to rotate the generator to start the engine.

[0003] However, the existing range-extended system and vehicle-mounted charging system are separated, which results in low power density, heavy device weight, large occupied space and difficult arrangement. SUMMARY

[0004] The present application aims at the shortcomings of the prior art and provides a vehicle-mounted power supply system, a vehicle and a control method of charging and discharging, so as to solve the technical problem that the separation of the range-extended system and the vehicle-mounted charging system results in low power density, heavy device weight, large occupied space and difficult arrangement.

[0005] In a first aspect, an embodiment of the present application provides a vehicle-mounted power supply system, comprising:

[0006] N+1 nodes, N being a positive integer greater than 2;

[0007] An alternating current charging port comprising a neutral line connector and N-phase alternating current connectors, the neutral line connector being electrically connected to one node, and the N-phase alternating current connectors being electrically connected to the N nodes one by one;

[0008] A bidirectional AC / DC converter comprising N+1 alternating current terminals and a direct current terminal, the N+1 alternating current terminals being electrically connected to the N+1 nodes one by one;

[0009] A battery pack, the battery pack being electrically connected to the direct current terminal of the bidirectional AC / DC converter;

[0010] A switch module comprising at least one alternating current charging terminal switch device and N generator terminal switch devices; the alternating current charging terminal switch device being electrically connected between the alternating current connector and the corresponding node;

[0011] The generator interface comprises N generator terminals, one end of each of the switch devices of the N generator terminals is electrically connected with one of the N generator terminals, and the other end is electrically connected with one of the N nodes;

[0012] The controller is configured to, when detecting that the vehicle is in the range extending mode, control the switch devices of the N generator terminals to be turned on and control the switch devices of the AC charging end to be turned off, so that the DC power output by the battery pack is converted into AC power by the bidirectional AC / DC converter and then output from the generator interface, or so that the AC power input by the generator interface is converted into DC power by the bidirectional AC / DC converter and then used to charge the battery pack; and when detecting that the vehicle is in the charging gun mode, control the switch devices of the AC charging end to be turned on and control the switch devices of the N generator terminals to be turned off, so that the AC power input by the AC charging port is converted into DC power by the bidirectional AC / DC converter and then used to charge the battery pack.

[0013] In one possible implementation, N is 3;

[0014] The N-phase AC terminal comprises a first AC terminal, a second AC terminal, and a third AC terminal;

[0015] The N+1 nodes comprise a first node, a second node, a third node, and a fourth node, which correspond to the neutral terminal, the first AC terminal, the second AC terminal, and the third AC terminal, respectively;

[0016] The switch device of the AC charging end comprises a first switch device and a second switch device;

[0017] One end of the first switch device is electrically connected with the second AC terminal, and the other end is electrically connected with the third node;

[0018] One end of the second switch device is electrically connected with the third AC terminal, and the other end is electrically connected with the fourth node.

[0019] In one possible implementation, N is 3;

[0020] The N-phase AC terminal comprises a first AC terminal, a second AC terminal, and a third AC terminal;

[0021] The N+1 nodes comprise a first node, a second node, a third node, and a fourth node, which correspond to the neutral terminal, the first AC terminal, the second AC terminal, and the third AC terminal, respectively;

[0022] The switch device of the AC charging end comprises a third switch device and a fourth switch device;

[0023] The third switch device is electrically connected with the third node and the second node at two ends, respectively;

[0024] The fourth switch device has two ends electrically connected with the fourth node and the first node respectively.

[0025] In a possible implementation, the vehicle-mounted power supply system further includes:

[0026] The first bidirectional DC-DC converter 6 includes a first DC-DC end and a second DC-DC end, and the first DC-DC end and the second DC-DC end are electrically connected with the DC terminal and the battery pack respectively.

[0027] The first bidirectional DC-DC converter 6 is configured to convert the first voltage output by the bidirectional AC-DC converter and the second voltage output by the first bidirectional DC-DC converter 6, and the second voltage is the charging voltage of the battery pack.

[0028] In a possible implementation, the vehicle-mounted power supply system further includes:

[0029] The second bidirectional DC-DC converter includes a third DC-DC end and a fourth DC-DC end, and the third DC-DC end and the fourth DC-DC end are electrically connected with the battery pack and the DC output interface respectively.

[0030] The second bidirectional DC-DC converter is configured to convert the third voltage output by the battery pack and the fourth voltage output by the second bidirectional DC-DC converter, and the fourth voltage is lower than the third voltage.

[0031] In a possible implementation, the vehicle-mounted power supply system further includes:

[0032] The AC output interface includes a first AC output interface and a second AC output interface, and the first AC output interface is electrically connected with the node electrically connected with the neutral line connector.

[0033] The switch module further includes a fifth switch device, and the two ends of the fifth switch device are electrically connected with one of the nodes electrically connected with the second AC output interface and the N-phase AC connector.

[0034] The controller is configured to, when detecting the power supply instruction of the AC output interface, control the switch device of the AC charging end to be in an open state and control the fifth switch device to be in a conductive state.

[0035] In a possible implementation, the vehicle-mounted power supply system further includes:

[0036] The at least one load interface is configured to be electrically connected with an external device, and the external device includes at least one of a resistance heater, a compressor, an inverter and a car computer; and / or,

[0037] The controller is further configured to, when detecting that the discharge gun mode is in the discharge gun mode, control the battery pack to convert the direct current into alternating current through the bidirectional AC-DC converter and output the alternating current from the AC charging port.

[0038] In a second aspect, the embodiments of the present application also provide a vehicle comprising the vehicle power supply system according to the first aspect.

[0039] In a third aspect, the embodiments of the present application also provide a control method for charging and discharging of a vehicle power supply system, applied to the vehicle power supply system according to the first aspect, comprising:

[0040] When it is detected that the vehicle is in the range extending mode, the switching devices at the N generator ends are controlled to be turned on, and the switching devices at the AC charging end are controlled to be turned off, so that the DC power output by the battery pack is converted into AC power by the bidirectional AC / DC converter and then output from the generator interface, or the AC power input by the generator interface is converted into DC power by the bidirectional AC / DC converter and then used to charge the battery pack.

[0041] When it is detected that the vehicle is in the charging gun mode, the switching devices at the AC charging end are controlled to be turned on, and the switching devices at the N generator ends are controlled to be turned off, so that the AC power input by the AC charging port is converted into DC power by the bidirectional AC / DC converter and then used to charge the battery pack.

[0042] In a possible implementation, the control method for charging and discharging of the vehicle power supply system further comprises:

[0043] When it is detected that the vehicle is in the discharging gun mode, the switching devices at the AC charging end are controlled to be turned on, and the switching devices at the N generator ends are controlled to be turned off, so that the DC power output by the battery pack is converted into AC power by the bidirectional AC / DC converter and then output from the AC charging port.

[0044] In a possible implementation, the control method for charging and discharging of the vehicle power supply system further comprises:

[0045] When it is detected that the power supply instruction of the AC output interface is detected, the switching devices at the AC charging end are controlled to be turned off, and the fifth switching device is controlled to be turned on; the node at which the first AC output interface of the AC output interface and the neutral line connector are electrically connected is electrically connected; and the two ends of the fifth switching device are respectively electrically connected to one of the nodes at which the second AC output interface of the AC output interface and the N-phase AC connector are electrically connected.

[0046] The technical scheme provided by the embodiments of the present application has the following beneficial technical effects:

[0047] The embodiments of the present application combine the range extending mode of the range extending system and the vehicle charging system, and control the switching of the switching devices at the AC charging end and the switching devices at the N generator ends by the controller, so that the vehicle power supply system according to the embodiments of the present application can realize the range extending mode and the charging gun mode, has the advantages of improved power density, reduced device weight, reduced occupied space, and easier arrangement of the system. Meanwhile, the bidirectional AC / DC converter is reused, and the cost is reduced.

[0048] Additional aspects and advantages of the present application will be partially apparent and will be fully understood in view of the detailed description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0049] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0050] Figure 1 A framework diagram of a vehicle-mounted power supply system provided for an embodiment of the present application;

[0051] Figure 2 A circuit structure diagram of a vehicle-mounted power supply system provided for an embodiment of the present application;

[0052] Figure 3 A flowchart of a charge-discharge control method of a vehicle-mounted power supply system provided for an embodiment of the present application, mainly showing a flowchart of a range extending mode;

[0053] Figure 4 A flowchart of a charge-discharge control method of a vehicle-mounted power supply system provided for an embodiment of the present application, mainly showing flowcharts of a charging gun mode and a discharging gun mode;

[0054] Figure 5 A flowchart of a charge-discharge control method of a vehicle-mounted power supply system provided for an embodiment of the present application, mainly showing a flowchart of an AC output interface power supply.

[0055] REFERENCE NUMERALS:

[0056] A-first node, B-second node, C-third node, D-fourth node;

[0057] 1-AC charging port, N-neutral line connector, L1-first AC power connector, L2-second AC power connector, L3-third AC power connector;

[0058] 2-bidirectional AC-DC converter;

[0059] 3-battery pack;

[0060] K1-first switching device, K2-second switching device, K3-third switching device, K4-fourth switching device, K5-fifth switching device, K6-sixth switching device, K7-seventh switching device, K8-eighth switching device;

[0061] 4-switching module, 41-switching device of AC charging end, 42-switching device of generator end;

[0062] 5 - generator interface, U - first generator terminal, V - second generator terminal, W - third generator terminal;

[0063] 6 - controller;

[0064] 7 - first bidirectional DC / DC converter;

[0065] 8 - second bidirectional DC / DC converter;

[0066] 9 - AC output interface;

[0067] 10 - load interface;

[0068] 11 - DC output interface;

[0069] 12 - fuse. DETAILED DESCRIPTION

[0070] The present application will be described in detail below, examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar components or components having the same or similar functions throughout. In addition, if a detailed description of known technology is unnecessary for the features of the present application shown, it is omitted. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only and cannot be interpreted as a limitation on the present application.

[0071] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as that generally understood by those skilled in the art to which the present application belongs.

[0072] Those skilled in the art can understand that, unless otherwise stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the use of the phrase "comprising" in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there can be intermediate elements. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0073] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples.

[0074] The present application provides a vehicle-mounted power supply system, as shown inFigure 1 As shown in the figure, the vehicle-mounted power supply system comprises N+1 nodes, an alternating current charging port 1, a bidirectional alternating current-direct current converter 2, a battery pack 3, a switch module 4, a generator interface 4 and a controller 6; N is a positive integer greater than 2.

[0075] The alternating current charging port 1 comprises a neutral line connector N and N-phase alternating current connectors, the neutral line connector N is electrically connected to one node, and the N-phase alternating current connectors are electrically connected to the N nodes one by one.

[0076] The bidirectional alternating current-direct current converter 2 comprises N+1 alternating current terminals and a direct current terminal, and the N+1 alternating current terminals are electrically connected to the N+1 nodes one by one.

[0077] The battery pack 3 is electrically connected to the direct current terminal of the bidirectional alternating current-direct current converter.

[0078] The switch module 4 comprises at least one alternating current charging end switch device 41 and N generator end switch devices 42; the alternating current charging end switch device 41 is electrically connected between the alternating current connector and the corresponding node.

[0079] The generator interface 4 comprises N generator connectors, one end of each generator end switch device 42 is electrically connected to one generator connector, and the other end is electrically connected to one node of the N nodes.

[0080] The controller 6 is electrically connected to all the switch devices, and is used for controlling the N generator end switch devices 42 to be turned on and controlling the alternating current charging end switch device 41 to be in an off state when it is detected that the range extending mode is in, so that the direct current output by the battery pack 3 is converted into alternating current by the bidirectional alternating current-direct current converter 2 and then output from the generator interface 4, or so that the alternating current input by the generator interface 4 is converted into direct current by the bidirectional alternating current-direct current converter 2 to charge the battery pack 3; when it is detected that the charging gun mode is in, the alternating current charging end switch device 41 is controlled to be turned on, and the N generator end switch devices 42 are controlled to be in an off state, so that the alternating current input by the alternating current charging port 1 is converted into direct current by the bidirectional alternating current-direct current converter 2 to charge the battery pack 3.

[0081] Optionally, the bidirectional alternating current-direct current converter 2 is a bidirectional ACDC converter, AC (Alternang Current, alternating current) and DC (Direct Current, direct current) are devices for converting alternating current into direct current.

[0082] Optionally, all the switch devices in the embodiment of the application can be contactors.

[0083] The embodiment of the application combines the range extending mode of the range extending system and the on-board charging system, and controls the switching of the switching device 41 of the alternating current charging end and the switching device 42 of the N generators by the controller 6, so that the on-board power supply system of the embodiment of the application can realize the range extending mode and the charging gun mode, has the advantages of improving the power density, reducing the weight of the device, reducing the occupied space, and the arrangement of the system is easier. At the same time, the bidirectional AC / DC converter 2 is reused, and the cost is reduced.

[0084] As an example, referring to Figure 2 As shown, N is 3, the N-phase alternating current joint is a three-phase alternating current joint, and the three-phase alternating current joint includes a first alternating current joint L1, a second alternating current joint L2 and a third alternating current joint L3; the N+1 nodes include a first node A, a second node B, a third node C and a fourth node D, which correspond to the neutral line joint N, the first alternating current joint L1, the second alternating current joint L2 and the third alternating current joint L3 respectively. The N+1 alternating current terminals of the bidirectional AC / DC converter 2 are electrically connected with the first node A, the second node B, the third node C and the fourth node D respectively. The switching device 42 of the generator end includes a sixth switching device K6, a seventh switching device K7 and an eighth switching device K8. The two ends of the sixth switching device K6 are electrically connected with the first generator joint U and the second node B respectively, the two ends of the seventh switching device K7 are electrically connected with the second generator joint V and the third node C respectively, and the two ends of the eighth switching device K8 are electrically connected with the third generator joint W and the fourth node D respectively.

[0085] Optionally, the first switching device K1 and the second switching device K2 are controlled to be conductive, and the sixth switching device K6, the seventh switching device K7 and the eighth switching device K8 are controlled to be in the off state, and the bidirectional AC / DC converter 2 converts the three-phase alternating current output by the alternating current charging port 1 into direct current, or converts the direct current into three-phase alternating current.

[0086] In some embodiments, referring to Figure 2 As shown, the switching device 41 of the alternating current charging end includes a first switching device K1 and a second switching device K2; one end of the first switching device K1 is electrically connected with the second alternating current joint L2, and the other end is electrically connected with the third node C; one end of the second switching device K2 is electrically connected with the third alternating current joint L3, and the other end is electrically connected with the fourth node D.

[0087] Optionally, the first switching device K1 and the second switching device K2 are controlled to be conductive, and the sixth switching device K6, the seventh switching device K7 and the eighth switching device K8 are controlled to be in the off state, and the bidirectional AC / DC converter 2 converts the three-phase alternating current output by the alternating current charging port 1 into direct current, or converts the direct current into three-phase alternating current.

[0088] In some embodiments, referring toFigure 2 As shown, the switching device 41 of the alternating current charging end includes a third switching device K3 and a fourth switching device K4; the two ends of the third switching device K3 are electrically connected with the third node C and the second node B respectively; the two ends of the fourth switching device K4 are electrically connected with the fourth node D and the first node A respectively.

[0089] In some embodiments, referring to Figure 2 As shown, the vehicle-mounted power supply system further includes a first bidirectional DC-DC converter 76; the first bidirectional DC-DC converter 76 includes a first DC-DC end and a second DC-DC end, and the first DC-DC end and the second DC-DC end are electrically connected with the DC terminal and the battery pack 3 respectively. The first bidirectional DC-DC converter 76 is used for converting the first voltage output by the bidirectional AC-DC converter 2 and the second voltage output by the first bidirectional DC-DC converter 76, and the second voltage is the charging voltage of the battery pack 3.

[0090] In some embodiments, referring to Figure 2 As shown, the vehicle-mounted power supply system further includes a second bidirectional DC-DC converter 8. The second bidirectional DC-DC converter 8 includes a third DC-DC end and a fourth DC-DC end, and the third DC-DC end and the fourth DC-DC end are electrically connected with the battery pack 3 and the DC output interface respectively. The second bidirectional DC-DC converter 8 is used for converting the third voltage output by the battery pack 3 and the fourth voltage output by the second bidirectional DC-DC converter 8; the fourth voltage is lower than the third voltage. The DC output interface 11 is used for charging the battery.

[0091] In some embodiments, referring to Figure 2 As shown, the vehicle-mounted power supply system further includes an alternating current output interface 9. The alternating current output interface 9 includes a first alternating current output interface 9 and a second alternating current output interface 9, and the first alternating current output interface 9 is electrically connected with the node electrically connected with the neutral line joint N, that is, electrically connected with the first node A. The switching module 4 further includes a fifth switching device K5; the two ends of the fifth switching device K5 are electrically connected with one of the nodes electrically connected with the second alternating current output interface 9 and the N-phase alternating current joint, that is, electrically connected with one of the second node B, the third node C and the fourth node D. In Figure 2 As shown in the embodiment, the two ends of the fifth switching device K5 are electrically connected with the second alternating current output interface 9 and the third node C respectively.

[0092] In some embodiments, the controller 6 is configured to control the switch device 41 at the AC charging end to be in an off state, control the fifth switch device K5 to be in a conductive state, and control the AC power to be output from the third node C after the DC power of the battery pack 3 is converted by the first bidirectional DC-DC converter 7 and the bidirectional AC-DC converter 2 when the power supply instruction of the AC output interface 9 is detected. Specifically, when the AC output interface 9 is powered, all the switch devices are in an off state except the fifth switch device K5.

[0093] In some embodiments, referring to Figure 2 the vehicle-mounted power supply system, the vehicle-mounted power supply system further comprises at least one load interface 10. The at least one load interface 10 is configured to be electrically connected with an external device. The external device comprises at least one of a resistance heater, a compressor, an inverter, and a vehicle computer. Specifically, the interface connected with the vehicle computer is a low-voltage control interface, and the controller 6 is electrically connected with the low-voltage control interface. The battery pack 3 is electrically connected with all the load interfaces 10.

[0094] Optionally, referring to Figure 2 the vehicle-mounted power supply system further comprises a plurality of fuses 12. The first bidirectional DC-DC converter and the second bidirectional DC-DC converter 8 are electrically connected with the battery pack 3 through a fifth node, and one of the fuses 12 is arranged on a branch electrically connected with the battery pack 3 at the fifth node. The load interface connected with the resistance heater, the compressor, and the inverter can also be electrically connected with the fifth node, and at least one of the fuses 12 is arranged between the load interface connected with the resistance heater, the compressor, and the inverter and the fifth node. The load interface connected with the resistance heater, the compressor, and the inverter can also be directly electrically connected with another terminal of the battery pack 3, and the low-voltage control interface can be directly electrically connected with the battery pack 3.

[0095] In some embodiments, the controller 6 is further configured to control the battery pack 3 to output the AC power from the AC charging port 1 by converting the DC power into the AC power through the bidirectional AC-DC converter 2 when it is detected that the battery pack 3 is in the discharging gun mode.

[0096] As an example, based on Figure 2 the circuit structure shown in the figure, all the switch devices are in an off state by default. When it is detected that the AC charging port 1 is inserted with a gun, the controller 6 controls all the switch devices to be in an off state, and judges whether the inserted gun is an AC charging gun or an AC discharging gun.

[0097] When the AC charging gun is inserted, the type of AC power output by the charging gun is determined, and when the type of AC power output by the charging gun is the first type of AC power, the first type is single-phase, for example, 220V (volts) single-phase, after the vehicle and the charging pile system complete the handshake, the third switch device K3 and the fourth switch device K4 are controlled to be turned on, and the remaining switch devices are all turned off, so that the neutral line connector N and the third AC power connector L3 are connected in parallel, and the first AC power connector L1 and the second AC power connector L2 are connected in parallel, the bidirectional AC / DC converter 2 is started, and 220V AC power is converted into 750V DC power. Then the first bidirectional DC / DC converter 7 is started, and the 750V DC power is converted into the charging voltage of the battery pack 3, and the battery pack 3 is charged.

[0098] When the AC charging gun is inserted, the type of AC power output by the charging gun is determined, and when the type of AC power output by the charging gun is the second type of AC power, the second type is three-phase, for example, three-phase 380V AC, after the vehicle and the charging pile system complete the handshake, the first switch device K1 and the second switch device K2 are controlled to be turned on, and the remaining switch devices are all turned off. The bidirectional AC / DC converter 2 is started, and the three-phase 380V AC power is converted into 750V DC power. Then the first bidirectional DC / DC converter 7 is started, and the 750V DC power is converted into the charging voltage of the battery pack 3, and the battery pack 3 is charged.

[0099] When the AC charging gun is inserted, the type of AC power output by the charging gun is determined, and when the type of AC power output by the charging gun is the second type of AC power, the second type is three-phase, for example, three-phase 380V AC, after the vehicle and the charging pile system complete the handshake, the first switch device K1 and the second switch device K2 are controlled to be turned on, and the remaining switch devices are all turned off. The bidirectional AC / DC converter 2 is started, and the three-phase 380V AC power is converted into 750V DC power. Then the first bidirectional DC / DC converter 7 is started, and the 750V DC power is converted into the charging voltage of the battery pack 3, and the battery pack 3 is charged.

[0100] When it is detected that it is in the range extending mode, all the switch devices are controlled to be in the off state, the sixth switch device K6, the seventh switch device K7 and the eighth switch device K8 are controlled to be turned on, and the remaining switch devices are kept in the off state. When it is detected that the instruction to start the engine is detected, the DC power output by the battery pack 3 is converted into three-phase AC power by the bidirectional AC / DC converter 2 and then output from the generator interface 4, and the generator receives the three-phase AC power and converts the electrical energy into kinetic energy to start the engine. When the engine is started, it works in the constant speed state, the range extending mode enters the power generation state, the generator converts the kinetic energy of the engine into three-phase AC power and outputs it from the generator interface 4, and the three-phase AC power output from the generator interface 4 is converted into 750V DC power by the bidirectional AC / DC converter 2. Then the first bidirectional DC / DC converter 7 is started, and the 750V DC power is converted into the charging voltage of the battery pack 3, and the battery pack 3 is charged.

[0101] When the power supply instruction of the AC output interface 9 is detected, all the switching devices are controlled to be in an off state, and it is first judged whether the whole vehicle judges whether the power supply of the AC output interface 9 is allowed. The current vehicle power and whether the AC charging port 1 is closed can be used as a judgment condition. When the power supply of the AC output interface 9 is allowed, the fifth switching device K5 is controlled to be turned on, and the remaining switching devices are maintained in an off state. The first bidirectional DC-DC converter 7 is started to convert the voltage of the battery pack 3 into 750V DC. Then, the bidirectional AC-DC converter 2 is started to convert the 750V DC into 220V AC, and the AC output interface 9 outputs the 220V AC to supply power to external equipment. Alternatively, the power switch of the AC output interface 9 can be a physical button or a soft switch on a touch screen. When the power switch of the AC output interface 9 is turned on, the controller 6 can detect the power supply instruction of the AC output interface 9.

[0102] The controller 6 controls the conduction and disconnection of the first switching device K1 and the second switching device K2 or the conduction and disconnection of the third switching device K3 and the fourth switching device K4 between the AC charging port 1 and the bidirectional AC-DC converter 2 in the embodiment of the application, so that the 220V single-phase and 380V three-phase charging of the charging gun can be adapted, and the practicality is high. Meanwhile, the controller 6 controls the conduction of the third switching device K3 and the fourth switching device K4, so that the voltage of the battery pack 3 can be discharged from the discharge gun of the AC charging port 1 through the first bidirectional DC-DC converter 7 and the bidirectional AC-DC converter 2. The AC charging port 1 can realize charging and discharging.

[0103] The function of the embodiment of the application is various. The controller 6 controls the conduction and disconnection of the switching devices to multiplex the bidirectional AC-DC converter 2 and the first bidirectional DC-DC converter 7, so that the 220V single-phase and 380V three-phase charging of the AC charging port 1, the charging and discharging of the generator interface 5, the 220V power supply of the AC output interface 9, the power supply of the DC output interface 11 and the power distribution of the load interfaces 10 can be realized.

[0104] Based on the same inventive concept, the embodiment of the application further provides a vehicle comprising the vehicle-mounted power supply system.

[0105] Based on the same inventive concept, the embodiment of the application further provides a control method for charging and discharging of a vehicle-mounted power supply system, which is applied to the vehicle-mounted power supply system, and the control method comprises the following steps.

[0106] When it is detected that the vehicle is in the range extending mode, the switching devices 42 of the N generator ends are controlled to be turned on, and the switching device 41 of the AC charging end is controlled to be in an off state. The DC power output by the battery pack 3 is converted into AC power by the bidirectional AC-DC converter 2 and then output from the generator interface 4, or the AC power input by the generator interface 4 is converted into DC power by the bidirectional AC-DC converter 2 to charge the battery pack 3.

[0107] Optionally, as an example, refer to Figure 3 The flow chart of the extended range mode is shown, combined with Figure 2 The vehicle power supply system shown, the control method of the charge and discharge of the vehicle power supply system includes the following steps:

[0108] S301, start the extended range mode, control all switch devices to be in the off state.

[0109] Optionally, when the engine start instruction is detected, the extended range mode is started, and when it is detected that it is in the extended range mode, all switch devices are controlled to be in the off state, that is, the first switch device K1, the second switch device K2, the third switch device K3, the fourth switch device K4, the fifth switch device K5, the sixth switch device K6, the seventh switch device K7 and the eighth switch device K8.

[0110] S302, judge whether to allow starting, if allowed to start, execute step S303.

[0111] Optionally, judging whether to allow starting includes whether all switch devices are in the off state, or whether the engine can start normally. If all switch devices are in the off state, or the engine can start normally, the starting is allowed.

[0112] S303, control the sixth switch device K6, the seventh switch device K7 and the eighth switch device K8 to be conductive.

[0113] S304, the voltage output by the battery pack 3 is converted into direct current of the first voltage through the first bidirectional DC-DC converter 7.

[0114] Optionally, the first voltage is 750v, and the battery pack 3 and the first bidirectional DC-DC converter 7 both output direct current.

[0115] S305, convert the first voltage into three-phase alternating current through the bidirectional AC-DC converter 2.

[0116] Optionally, the bidirectional AC-DC converter 2 can convert direct current into three-phase alternating current.

[0117] S306, the generator interface 4 discharges, and the engine starts.

[0118] S307, the generator converts the kinetic energy of the engine into three-phase alternating current and outputs from the generator interface 4.

[0119] S308, convert the three-phase alternating current into direct current of the first voltage through the bidirectional AC-DC converter 2.

[0120] S309, convert the direct current of the first voltage into charging voltage to charge the battery pack 3 through the first bidirectional DC-DC converter 7.

[0121] In some embodiments, the control method of the charging and discharging of the vehicle-mounted power supply system comprises: when it is detected that the charging gun mode is in the charging gun mode, controlling the switch device 41 of the alternating current charging end to be turned on and controlling the switch devices 42 of the N generator ends to be in the off state, so that the alternating current input by the alternating current charging port 1 is converted into direct current by the bidirectional AC / DC converter 2 to charge the battery pack 3.

[0122] In some embodiments, the control method of the charging and discharging of the vehicle-mounted power supply system further comprises:

[0123] When it is detected that the discharging gun mode is in the discharging gun mode, the switch device 41 of the alternating current charging end is controlled to be turned on and the switch devices 42 of the N generator ends are controlled to be in the off state, so that the battery pack 3 converts the direct current into alternating current by the bidirectional AC / DC converter 2 and outputs the alternating current from the alternating current charging port 1.

[0124] As an example, refer to Figure 4 As shown, in combination with Figure 2 The control method of the charging and discharging of the vehicle-mounted power supply system comprises the following steps:

[0125] S401, when it is detected that the alternating current charging port 1 is plugged in, all the switch devices are controlled to be in the off state.

[0126] Optionally, the off state of all the switch devices is the default state.

[0127] S402, it is judged whether it is a charging gun or a discharging gun, if it is a charging gun, step S403 is executed; if it is a discharging gun, step S412 is executed.

[0128] S403, it is judged whether the output is three-phase or single-phase, if it is single-phase, step S404 is executed; if it is three-phase, step S408 is executed.

[0129] Optionally, the output alternating current can be single-phase 220V or three-phase 380V.

[0130] S404, it is judged whether charging is allowed, if charging is allowed, step S405 is executed.

[0131] S405, the third switch device K3 and the fourth switch device K4 are controlled to be turned on, and the remaining switch devices are in the off state.

[0132] Optionally, the third switch device K3 and the fourth switch device K4 are controlled to be turned on, so that the neutral line connector N and the third alternating current connector L3 are in parallel connection, and the first alternating current connector L1 and the second alternating current connector L2 are in parallel connection.

[0133] S406, the single-phase alternating current is converted into direct current of the first voltage by the bidirectional AC / DC converter 2.

[0134] Optionally, converting the single-phase alternating current into the first-voltage direct current is converting 220-volt alternating current into 750-volt direct current.

[0135] S407, converting the first-voltage direct current into the charging voltage of the battery pack 3 through the first bidirectional direct-current converter 7 to charge the battery pack 3.

[0136] S408, determining whether to allow charging, and if so, executing step S409.

[0137] S409, controlling the first switch K1 and the second switch K2 to be conductive, and the remaining switches to be in an off state.

[0138] S410, converting the three-phase alternating current into the first-voltage direct current through the bidirectional AC-DC converter 2.

[0139] Optionally, converting the three-phase alternating current into the first-voltage direct current is converting 380-volt three-phase alternating current into 750-volt direct current.

[0140] S411, converting the first-voltage direct current into the charging voltage of the battery pack 3 through the first bidirectional direct-current converter 7 to charge the battery pack 3.

[0141] S412, determining whether to allow discharging, and if so, executing step S413.

[0142] S413, controlling the third switch K3 and the fourth switch K4 to be conductive, and the remaining switches to be in an off state.

[0143] S414, converting the voltage of the battery pack 3 into the first-voltage direct current through the first bidirectional direct-current converter 7.

[0144] Optionally, the first-voltage direct current is 750-volt direct current.

[0145] S415, converting the first-voltage direct current into alternating current through the bidirectional AC-DC converter 2 to output from the AC charging port 1.

[0146] In some embodiments, the control method of the charging and discharging of the vehicle-mounted power supply system further comprises:

[0147] When the power supply instruction of the AC output interface 9 is detected, the switch 41 of the AC charging end is controlled to be in an off state, the fifth switch K5 is controlled to be conductive, the first AC output interface of the AC output interface 9 is electrically connected to the node electrically connected to the neutral line joint N, and the two ends of the fifth switch K5 are respectively electrically connected to one of the nodes electrically connected to the second AC output interface of the AC output interface 9 and the N-phase AC joint.

[0148] As an example, refer to Figure 5 As shown in the vehicle power supply system, Figure 2 The control method of the vehicle power supply system shown, the control method of the charge and discharge of the vehicle power supply system includes the following steps:

[0149] S501, when detecting the power supply instruction of the AC output interface 9, control all switch devices to be in an off state.

[0150] Optionally, the power switch of the AC output interface 9 can be a physical button or a soft switch on the touch screen. When the power switch of the AC output interface 9 is turned on, the controller 6 can detect the power supply instruction of the AC output interface 9. Controlling all switch devices to be in an off state is the default state.

[0151] S502, judge whether to allow the power supply of the AC output interface 9, if the power supply of the AC output interface 9 is allowed, execute step S503.

[0152] Optionally, the current vehicle power and / or whether the AC charging port 1 is closed are used as judgment conditions. When the current vehicle power meets the predetermined condition and / or the AC charging port 1 is closed, it is judged that the power supply of the AC output interface 9 is allowed.

[0153] S503, control the fifth switch device K5 to be conductive, and the remaining switch devices to be in an off state.

[0154] S504, convert the voltage of the battery pack 3 into a direct current of the first voltage through the first bidirectional DC-DC converter 7.

[0155] Optionally, converting the voltage of the battery pack 3 into a direct current of the first voltage is converting the voltage of the battery pack 3 into a 750v direct current.

[0156] S505, convert the direct current of the first voltage into an alternating current through the bidirectional AC-DC converter 2, and output from the AC output interface 9.

[0157] Optionally, converting the direct current of the first voltage into an alternating current is converting the 750v direct current into a 220v alternating current.

[0158] Optionally, the two ends of the fifth switch device K5 are respectively connected with the second AC output interface of the AC output interface 9 and the third node C, the third node C outputs a 220v alternating current, so that the AC output interface 9 outputs a 220v alternating current.

[0159] By applying the embodiment of the application, the following beneficial effects can be achieved:

[0160] (1) The embodiment of the present application combines the range extending mode of the range extending system and the on-board charging system, and controls the switching of the switching device 41 of the alternating current charging end and the switching device 42 of the N number of generator ends by the controller 6, so that the on-board power supply system of the embodiment of the present application can realize the range extending mode and the charging gun mode, has the advantages of improving the power density, reducing the weight of the device, reducing the occupied space, and the arrangement of the system is easier. At the same time, the reuse of the bidirectional AC / DC converter 2 reduces the cost.

[0161] (2) The embodiment of the present application controls the conduction, disconnection of the first switching device K1 and the second switching device K2, or the conduction, disconnection of the third switching device K3 and the fourth switching device K4 between the alternating current charging port 1 and the bidirectional AC / DC converter 2 by the controller 6, which can adapt to the 220v single-phase and 380v three-phase charging of the charging gun, and has strong practicability. At the same time, the controller 6 controls the conduction of the third switching device K3 and the fourth switching device K4, so that the voltage of the battery pack 3 can be discharged from the discharge gun of the alternating current charging port 1 through the first bidirectional DC / DC converter 7 and the bidirectional AC / DC converter 2. The alternating current charging port 1 can realize charging and discharging.

[0162] (3) The embodiment of the present application has various functions. The controller 6 controls the conduction and disconnection of each switching device, and reuses the bidirectional AC / DC converter 2 and the first bidirectional DC / DC converter 7, so that the 220v single-phase and 380v three-phase charging of the alternating current charging port 1, the charging and discharging of the generator interface 5, the 220v power supply provided by the alternating current output interface 9, the power supply of the direct current output interface 11, and the power distribution of each load interface 10 can be realized.

[0163] Those skilled in the art can understand that the steps, measures and schemes in the various operations, methods and processes discussed in the present application can be alternated, changed, combined or deleted. Further, other steps, measures and schemes in the various operations, methods and processes discussed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted. Further, the steps, measures and schemes in the various operations, methods and processes in the prior art can also be alternated, changed, rearranged, decomposed, combined or deleted.

[0164] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0165] The terms "first", "second", etc. are used only to describe purposes and can not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0166] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0167] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0168] It should be understood that although each step in the flowchart of the accompanying drawings is shown in sequence according to the direction of the arrow, these steps are not necessarily executed in sequence according to the direction of the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and they can be executed in other orders. Moreover, at least part of the steps in the flowchart of the accompanying drawings can include a plurality of sub-steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or sub-steps or stages of other steps.

[0169] The above is only some embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A vehicle-mounted power supply system, characterized in that, include: There are N+1 nodes, where N is a positive integer greater than 2; An AC charging port includes a neutral wire connector electrically connected to one of the nodes and an N-phase AC connector electrically connected to each of the N nodes in a one-to-one correspondence. A bidirectional AC / DC converter includes N+1 AC terminals, which are electrically connected to the N+1 nodes in a one-to-one correspondence. The battery pack is electrically connected to the DC terminal of the bidirectional AC / DC converter; A switching module, comprising at least one switching device at an AC charging terminal and N switching devices at generator terminals; The switching device of the AC charging terminal is electrically connected between the AC connector and the corresponding node; The generator interface includes N generator connectors, one end of the switching device at each generator end is electrically connected to one of the generator connectors, and the other end is electrically connected to one of the N nodes; The controller is configured to, when detecting that the device is in range-extending mode, turn on the switching devices at the N generator terminals and turn off the switching devices at the AC charging terminals, so that the DC power output from the battery pack is converted into AC power by the bidirectional AC / DC converter and output from the generator interface, or the AC power input from the generator interface is converted into DC power by the bidirectional AC / DC converter to charge the battery pack; when detecting that the device is in charging gun mode, the controller turns on the switching devices at the AC charging terminals and turns off the switching devices at the N generator terminals, so that the AC power input from the AC charging port is converted into DC power by the bidirectional AC / DC converter to charge the battery pack.

2. The vehicle power supply system according to claim 1, characterized in that, The value of N is 3; The N-phase AC power connector includes a first AC power connector, a second AC power connector, and a third AC power connector; The N+1 nodes include a first node, a second node, a third node, and a fourth node, which correspond to the neutral wire connector, the first AC connector, the second AC connector, and the third AC connector, respectively. The switching devices at the AC charging terminal include a first switching device and a second switching device. One end of the first switching device is electrically connected to the second AC connector, and the other end is electrically connected to the third node; One end of the second switching device is electrically connected to the third AC connector, and the other end is electrically connected to the fourth node.

3. The vehicle power supply system according to claim 1, characterized in that, The value of N is 3; The N-phase AC power connector includes a first AC power connector, a second AC power connector, and a third AC power connector; The N+1 nodes include a first node, a second node, a third node, and a fourth node, which correspond to the neutral wire connector, the first AC connector, the second AC connector, and the third AC connector, respectively. The switching devices at the AC charging terminal include a third switching device and a fourth switching device; The two ends of the third switching device are electrically connected to the third node and the second node, respectively; The two ends of the fourth switching device are electrically connected to the fourth node and the first node, respectively.

4. The vehicle power supply system according to claim 1, characterized in that, Also includes: The first bidirectional DC-DC converter includes a first DC-DC terminal and a second DC-DC terminal, wherein the first DC-DC terminal and the second DC-DC terminal are electrically connected to the DC terminal and the battery pack, respectively. The first bidirectional DC-DC converter is used to convert the first voltage output by the bidirectional AC-DC converter and the second voltage output by the first bidirectional DC-DC converter to each other, wherein the second voltage is the charging voltage of the battery pack.

5. The vehicle power supply system according to claim 1, characterized in that, Also includes: The second bidirectional DC-DC converter includes a third DC-DC terminal and a fourth DC-DC terminal, wherein the third DC-DC terminal and the fourth DC-DC terminal are electrically connected to the battery pack and the DC output interface, respectively. The second bidirectional DC-DC converter is used to convert between the third voltage output by the battery pack and the fourth voltage output by the second bidirectional DC-DC converter; the fourth voltage is lower than the third voltage.

6. The vehicle power supply system according to claim 1, characterized in that, Also includes: The AC output interface includes a first AC output interface and a second AC output interface, wherein the first AC output interface is electrically connected to the node electrically connected to the neutral line connector. The switching module further includes: a fifth switching device; the two ends of the fifth switching device are respectively electrically connected to one of the nodes that are electrically connected to the second AC output interface and the N-phase AC connector; The controller is configured to, when detecting a power supply command from the AC output interface, control the switching device at the AC charging terminal to be in the off state and control the fifth switching device to be on.

7. The vehicle power supply system according to claim 1, characterized in that, Also includes: At least one load interface for electrical connection to an external device; said external device includes at least one of a resistance heater, a compressor, an inverter, and a vehicle computer; and / or, The controller is also configured to, when detecting that it is in discharge gun mode, control the battery pack to convert DC power into AC power via the bidirectional AC-DC converter and output it from the AC charging port.

8. A vehicle, characterized in that, Includes the vehicle power system as described in any one of claims 1-7.

9. A method for controlling the charging and discharging of an on-board power system, applied to the on-board power system as described in any one of claims 1-7, characterized in that, include: When range-extending mode is detected, the switching devices at the N generator terminals are turned on, and the switching devices at the AC charging terminals are turned off, so that the DC power output from the battery pack is converted into AC power by the bidirectional AC-DC converter and then output from the generator interface, or the AC power input to the generator interface is converted into DC power by the bidirectional AC-DC converter to charge the battery pack. When the charging gun mode is detected, the switching device at the AC charging end is turned on, and the switching devices at the N generator ends are turned off, so that the AC power input at the AC charging port is converted into DC power by the bidirectional AC-DC converter to charge the battery pack.

10. The charging and discharging control method for the vehicle power system according to claim 9, characterized in that, Also includes: When the discharge gun mode is detected, the switching device at the AC charging end is turned on, and the switching devices at the N generator ends are turned off, so that the battery pack converts DC power into AC power through the bidirectional AC-DC converter and outputs it from the AC charging port.

11. The charging and discharging control method for the vehicle power system according to claim 9, characterized in that, Also includes: When a power supply command is detected from the AC output interface, the switching device at the AC charging terminal is in the off state, and the fifth switching device is turned on. The first AC output interface of the AC output interface is electrically connected to the node where the neutral line connector is electrically connected; the two ends of the fifth switching device are respectively electrically connected to one of the nodes where the second AC output interface of the AC output interface and the N-phase AC connector are electrically connected.

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