Thermal management system and control method of plug-in fuel cell hybrid electric vehicle

Abstract

The present invention relates to the technical field of hybrid electric vehicles, and specifically discloses a thermal management system for a plug-in fuel cell hybrid electric vehicle and a control method thereof. The thermal management system for the plug-in fuel cell hybrid electric vehicle is equipped with a hydrogen combustion heating device and a PTC heater. The hydrogen combustion heating device or the PTC heater can be used to warm up a fuel cell stack or a power battery. Meanwhile, during the warming-up process, if the driver has a demand for air conditioning and heating, the hydrogen combustion heating device and the PTC heater can also provide the driver with heating demand while warming up. According to the driver's demand for air conditioning and heating, on the basis of the hydrogen combustion heating device or the PTC heater, if the waste heat generated by the fuel cell stack is sufficient, the waste heat generated by the fuel cell stack can also be used to supplement the heating, thereby ensuring the performance of the fuel cell stack and the power battery in a low-temperature environment and meeting the driver's demand for air conditioning and heating.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a thermal management system for a plug-in fuel cell hybrid electric vehicle and a control method thereof. Background Art

[0002] Plug-in fuel cell hybrid vehicles have two power sources, namely fuel cell engines and power batteries. Since the conversion efficiency of fuel cell engines is very low in low temperature environments, they need to be warmed up. The discharge power of power batteries is also very low in low temperature environments, especially when the battery's state of charge is very low, the temperature has a great impact on the battery's discharge capacity. In addition, the use of many PTC hot air air conditioners in fuel cell hybrid vehicles is a very uneconomical heating method.

[0003] Therefore, in order to ensure the normal operation of plug-in fuel cell hybrid vehicles at low temperatures, especially the fuel cell stack, it is necessary to heat it at low temperatures to ensure its low temperature performance. The current low temperature performance of fuel cell stacks is mainly improved by introducing an external heat source heating system, or increasing the Joule heat inside the fuel cell to heat the fuel cell. The external heat source mainly includes PTC and hydrogen combustion heater. For the driver's warm air solution at low temperatures, fuel cell hybrids generally use the waste heat of power system components (batteries, motors, stacks, etc.) or PTC to obtain it. The above heat energy acquisition using the PTC solution is too inefficient on the one hand, and consumes the electric energy of the whole vehicle on the other hand (because the electric energy of the whole vehicle ultimately comes from the chemical energy of hydrogen, the power generation efficiency of the stack is low, and there is energy loss in the battery energy charging and discharging); citing other heat sources can improve the utilization of waste heat, but the energy level of the heat source of fuel cell vehicles is too low, and the demand for warm air at low temperatures is often not met. Summary of the invention

[0004] The purpose of the present invention is to provide a plug-in fuel cell hybrid electric vehicle thermal management system and a control method thereof, so as to improve the fuel cell stack performance and power battery low temperature performance of the whole vehicle in a low temperature environment and meet the driver's air conditioning and warm air acquisition needs.

[0005] In one aspect, the present invention provides a plug-in fuel cell hybrid electric vehicle thermal management system, the plug-in fuel cell hybrid electric vehicle thermal management system comprising:

[0006] A fuel cell stack temperature control circuit, comprising a fuel cell stack, a radiator, a cooling fan, a first electric water pump and a thermostat, wherein the radiator is connected to the fuel cell stack through a first pipeline and a second pipeline respectively, the thermostat comprises a first interface, a second interface and a third interface, the first interface and the third interface are connected in series to the first pipeline, and the coolant flowing through the fuel cell stack flows into the third interface, the first interface is used to transport the coolant to the radiator, the second interface is connected to the second pipeline, the first electric water pump is arranged in the second pipeline, and is used to drive the coolant to flow to the fuel cell stack, and the cooling fan is used to cool the radiator;

[0007] A heating circuit, comprising a PTC heater, a hydrogen combustion heater, a heater core, a first three-way valve, a heat exchanger and a second electric water pump, wherein the outlet of the medium side of the heat exchanger, the PTC heater, the hydrogen combustion heater and the heater core are sequentially connected in series, the first three-way valve comprises an A1 interface, a B1 interface and a C1 interface, the A1 interface is connected to the heater core, the B1 interface is connected to the inlet of the second electric water pump, the C1 interface is connected to the first pipeline, and the connection position of the C1 interface and the first pipeline is located between the thermostat and the fuel cell stack, the outlet of the second electric water pump is connected to the outlet of the medium side of the heat exchanger, and the heater core is also connected to the first pipeline;

[0008] A power battery temperature control circuit, comprising a power battery, a second three-way valve, a third electric water pump and a cooler, wherein the second three-way valve comprises an A2 interface, a B2 interface and a C2 interface, wherein the first interface is connected to an inlet of a heat exchange side of the heat exchanger, the second interface is respectively connected to an outlet of the heat exchange side of the heat exchanger and an outlet of the third electric water pump, the inlet of the third electric water pump is connected to the cooler, the cooler is connected to the power battery, and the power battery is connected to the C2 interface;

[0009] A temperature-controlled air conditioner, used to provide cooling to the cooler;

[0010] A first temperature sensor, the first temperature sensor is used to collect the temperature of the coolant flowing out of the fuel cell stack;

[0011] a second temperature sensor, the second temperature sensor being used to collect the temperature of the coolant flowing out from the medium side of the heat exchanger;

[0012] a third temperature sensor, the third temperature sensor being used to collect the temperature of the coolant flowing out of the third electric water pump;

[0013] A fourth temperature sensor is used to collect the temperature of the coolant flowing out of the heater core.

[0014] As a preferred technical solution of the thermal management system of a plug-in fuel cell hybrid electric vehicle, the thermal management system of the plug-in fuel cell hybrid electric vehicle further includes a hydrogen cylinder, which supplies hydrogen to the hydrogen combustion heater through a first hydrogen supply pipeline, and the hydrogen cylinder supplies hydrogen to the fuel cell stack through a second hydrogen supply pipeline;

[0015] The plug-in fuel cell hybrid electric vehicle thermal management system also includes a first solenoid valve and a second solenoid valve. The first solenoid valve is arranged on the first hydrogen supply pipeline, and the first solenoid valve is used to control the opening of the first hydrogen supply pipeline; the second solenoid valve is arranged on the second hydrogen supply pipeline, and the second solenoid valve is used to control the opening of the second hydrogen supply pipeline.

[0016] As a preferred technical solution for the thermal management system of a plug-in fuel cell hybrid electric vehicle, the first solenoid valve and the second solenoid valve are both electronically controlled proportional valves.

[0017] On the other hand, the present invention further provides a control method for a plug-in fuel cell hybrid electric vehicle thermal management system, which is implemented by the plug-in fuel cell hybrid electric vehicle thermal management system described in any of the above schemes, and the control method for the plug-in fuel cell hybrid electric vehicle thermal management system comprises:

[0018] Vehicle start;

[0019] Determine whether the driver has a request for air conditioning and heating;

[0020] If the driver does not request the air conditioning heating, the actual temperature T1 of the power battery is obtained and the temperature T2 collected by the first temperature sensor is obtained;

[0021] Compare T1 with the first set temperature Th1, and compare T2 with the second set temperature Th2;

[0022] If T1<Th1, or T2<Th2;

[0023] Then turn on the warm-up mode;

[0024] Turning on the warm-up mode includes: the A1 interface of the first three-way valve is disconnected, the B1 interface and the C1 interface are connected, the first interface of the thermostat is disconnected, the second interface and the third interface are connected, the first electric water pump, the second electric water pump and the third electric water pump are turned on, and the hydrogen combustion heater or the PTC heater is turned on; the B2 interface of the second three-way valve is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner is turned off.

[0025] As a preferred technical solution of the control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle, if T1≥Th1, and T2≥Th2, the normal cooling mode is turned on;

[0026] Turning on the normal cooling mode includes: the hydrogen combustion heater and the PTC heater are both turned off, the C1 interface of the first three-way valve is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump is turned off, the hydrogen combustion heater and the PTC heater are both turned off, the second interface of the thermostat is disconnected, the first interface and the third interface are connected, the first electric water pump is turned on, and the third electric water pump is turned on;

[0027] Compare T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1;

[0028] If T1>Tbat2, the A2 interface of the second three-way valve is disconnected, the B2 interface and the C2 interface are connected, and the temperature-controlled air conditioner delivers cold energy to the cooler;

[0029] If T1<Tbat1, the B2 interface of the second three-way valve is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner is turned off.

[0030] As a preferred technical solution of the control method of the thermal management system of the plug-in fuel cell hybrid vehicle, if the driver has an air conditioning heating request, the actual temperature T1 of the power battery is obtained and the temperature T2 collected by the first temperature sensor is collected;

[0031] Compare T1 with the third set temperature Th3, and compare T2 with the fourth set temperature Th4;

[0032] If T1>Th3, and T2>Th4, then turn on the normal air conditioning mode;

[0033] The normal air conditioning mode includes:

[0034] Compare T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1;

[0035] If T1>Tbat2, the third electric water pump is turned on, the A2 interface of the second three-way valve is disconnected, the B2 interface and the C2 interface are connected, and the temperature-controlled air conditioner delivers cold air to the cooler;

[0036] If T1<Tbat1, the third electric water pump is turned on, the B2 interface of the second three-way valve is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner is turned off.

[0037] As a preferred technical solution of the control method of the thermal management system of the plug-in fuel cell hybrid electric vehicle, after comparing T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, the normal air conditioning mode further includes:

[0038] Determine whether the fuel cell stack is in working state;

[0039] If the fuel cell stack is not in working state, compare T2 with the set air conditioning warm air temperature Tac;

[0040] If T2>Tac, the hydrogen combustion heater and the PTC heater are both turned off, the A1 interface of the first three-way valve is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump is turned on, the second interface of the thermostat is disconnected, the first interface and the third interface are connected, and the first electric water pump is turned on;

[0041] If T2≤Tac; the hydrogen combustion heater or the PTC heater is turned on, the C1 interface of the first three-way valve is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump is turned on, the second interface of the thermostat is disconnected, the first interface and the third interface are connected, and the first electric water pump is turned on.

[0042] As a preferred technical solution of the control method of the thermal management system of the plug-in fuel cell hybrid vehicle, if the fuel cell stack is in working state, T2 is compared with the set air conditioning warm air temperature Tac;

[0043] If T2>Tac, the hydrogen combustion heater and the PTC heater are both turned off, the A1 interface of the first three-way valve is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump is turned on, the second interface of the thermostat is disconnected, the first interface and the third interface are connected, and the first electric water pump is turned on;

[0044] If T2≤Tac, then obtaining the temperature T3 detected by the fourth temperature sensor;

[0045] Compare the sizes of T2 and T3;

[0046] If T2>T3, the A1 interface of the first three-way valve is disconnected, the C1 interface is connected to the B1 interface, the second electric water pump is turned on, the hydrogen combustion heater or the PTC heater is turned on, the first interface of the thermostat is disconnected, the second interface is connected to the third interface, and the first electric water pump is turned on;

[0047] If T2≤T3, the hydrogen combustion heater and the PTC heater are both turned off, the C1 interface of the first three-way valve is disconnected, the A1 interface and the B1 interface are connected, the two electric water pumps are turned on, the hydrogen combustion heater or the PTC heater is turned on, the second interface of the thermostat is disconnected, the first interface and the third interface are connected, and the first electric water pump is turned on.

[0048] As a preferred technical solution of the control method of the thermal management system of a plug-in fuel cell hybrid vehicle, if T1≤Th3, or T2≤Th4, the heating mode is turned on;

[0049] Turning on the heater warm-up mode includes: the A1 interface of the first three-way valve is disconnected, the B1 interface and the C1 interface are connected, the first interface of the thermostat is disconnected, the second interface and the third interface are connected, the first electric water pump, the second electric water pump and the third electric water pump are turned on, and the hydrogen combustion heater or the PTC heater is turned on; the B2 interface of the second three-way valve is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner is turned off.

[0050] As a preferred technical solution of the control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle, after turning on the heating mode or the warm-up mode, the thermal management system of the plug-in fuel cell hybrid electric vehicle further includes:

[0051] Determining a heating mode, wherein determining the heating mode comprises:

[0052] Obtain the actual power SOC of the power battery and the actual discharge power P of the power battery;

[0053] Compare the SOC with the set power SOC1, and the P with the set discharge power P1;

[0054] If SOC>SOC1, and P>P1, the hydrogen combustion heater is turned on and the PTC heater is turned off;

[0055] If SOC≤SOC1, or P≤P1, the hydrogen combustion heater is turned off and the PTC heater is turned on.

[0056] The beneficial effects of the present invention are:

[0057] The present invention provides a plug-in fuel cell hybrid electric vehicle thermal management system and a control method thereof. The plug-in fuel cell hybrid electric vehicle thermal management system is equipped with a hydrogen combustion heating device and a PTC heater. The hydrogen combustion heating device or the PTC heater can be used to warm up the fuel cell stack, or to warm up the power battery, or to warm up both components at the same time. Meanwhile, during the warming-up process, if the driver has a demand for air conditioning and heating, the hydrogen combustion heating device and the PTC heater can also provide the driver with heating demand while warming up. According to the driver's demand for air conditioning and heating, on the basis of the hydrogen combustion heating device or the PTC heater, if the waste heat generated by the fuel cell stack is sufficient, the waste heat generated by the fuel cell stack can also be used to supplement the heating, thereby making full use of the waste heat of the stack to heat the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a schematic diagram of the structure of a thermal management system of a plug-in fuel cell hybrid electric vehicle in an embodiment of the present invention;

[0059] Figure 2 It is a schematic diagram of the structure of a hydrogen cylinder, a hydrogen combustion heater and a fuel cell stack in a thermal management system of a plug-in fuel cell hybrid vehicle in an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of the structure of a control module in a thermal management system of a plug-in fuel cell hybrid electric vehicle according to an embodiment of the present invention;

[0061] Figure 4 The flow chart of the control method of the thermal management system of the plug-in fuel cell hybrid electric vehicle in the embodiment of the present invention is as follows: Figure 1 ;

[0062] Figure 5 The flow chart of the control method of the thermal management system of the plug-in fuel cell hybrid electric vehicle in the embodiment of the present invention is as follows: Figure 2 .

[0063] In the figure:

[0064] 11. fuel cell stack; 12. radiator; 13. cooling fan; 14. first electric water pump; 15. thermostat; 16. first pipeline; 17. second pipeline;

[0065] 21. PTC heater; 22. Hydrogen combustion heater; 23. Warm air core; 24. First three-way valve; 25. Heat exchanger; 26. Second electric water pump;

[0066] 31. Power battery; 32. Second three-way valve; 33. Third electric water pump; 34. Cooler;

[0067] 4. Temperature control air conditioning;

[0068] 51. A first temperature sensor; 52. A second temperature sensor; 53. A third temperature sensor; 54. A fourth temperature sensor;

[0069] 61. VCU; 62. BMS; 63. AC; 64. FCCU;

[0070] 71. Hydrogen cylinder; 72. First solenoid valve; 73. Second solenoid valve. DETAILED DESCRIPTION

[0071] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0075] like Figure 1 As shown, this embodiment provides a plug-in fuel cell hybrid electric vehicle thermal management system, which includes a fuel cell stack temperature control circuit, a heating circuit, a power battery temperature control circuit, a temperature control air conditioner 4, a first temperature sensor 51, a second temperature sensor 52, a third temperature sensor 53 and a fourth temperature sensor 54.

[0076] The fuel cell stack temperature control circuit includes a fuel cell stack 11, a power battery 31, a radiator 12, a cooling fan 13, a first electric water pump 14 and a thermostat 15, wherein the radiator 12 is connected to the fuel cell stack 11 through a first pipeline 16 and a second pipeline 17 respectively, and the thermostat 15 includes a first interface, a second interface and a third interface, the first interface and the third interface are connected in series to the first pipeline 16, and the coolant flowing through the fuel cell stack 11 flows into the third interface, the first interface is used to transport the coolant to the radiator 12, the second interface is connected to the second pipeline 17, the first electric water pump 14 is arranged in the second pipeline 17, and is used to drive the coolant to flow to the fuel cell stack 11, and the cooling fan 13 is used to cool the radiator 12.

[0077] The third interface of the thermostat 15 can be selectively connected to the first interface and the second interface. When the third interface is connected to the first interface and the second interface is disconnected, after the first electric water pump 14 is started, the coolant can circulate along the path of the fuel cell stack 11-thermostat 15-radiator 12-first electric water pump 14-fuel cell stack 11. At this time, under the action of the cooling fan 13, the radiator 12 can cool the coolant, and then cool the fuel cell stack 11, which can adapt to the working condition that the fuel cell stack 11 needs to dissipate heat. When the third interface is connected to the second interface and the first interface is disconnected, the coolant can circulate along the flow mode of the fuel cell stack 11-thermostat 15-first electric water pump 14-fuel cell stack 11. At this time, the coolant does not flow through the radiator 12, which can adapt to the working condition of the fuel cell stack 11 starting at low temperature.

[0078] Optionally, the thermostat 15 may be an electronic thermostat 15 , or a wax type thermostat 15 .

[0079] The heating circuit includes a PTC heater 21, a hydrogen combustion heater 22, a heater core 23, a first three-way valve 24, a heat exchanger 25 and a second electric water pump 26. The heat exchanger 25 includes a medium side and a heat exchange side. The outlet of the medium side of the heat exchanger, the PTC heater 21, the hydrogen combustion heater 22 and the heater core 23 are connected in series in sequence. The first three-way valve 24 includes an A1 interface, a B1 interface and a C1 interface, wherein the C1 interface can selectively connect the A1 interface and the B1 interface, the A1 interface is connected to the heater core 23, the B1 interface is connected to the inlet of the second electric water pump 26, the C interface is connected to the first pipeline 16, and the connection position of the C1 interface and the first pipeline 16 is located between the thermostat 15 and the fuel cell stack 11, the outlet of the second electric water pump 26 is connected to the outlet of the medium side of the heat exchanger, and the heater core 23 is also connected to the first pipeline 16. When the PTC heater 21 and / or the hydrogen combustion heater 22 are started, the coolant flowing through can be heated, and the heater core 23 is used to provide heating to the cab.

[0080] When the fuel cell stack 11 is started at low temperature, the C1 interface and the B1 interface of the first three-way valve 24 are connected, and the A1 interface is disconnected. When the coolant flowing out of the fuel cell stack 11 in the fuel cell stack temperature control circuit flows through the connection position of the C1 interface and the first pipeline 16, it flows to the medium side of the heat exchanger-PTC heater 21-hydrogen combustion heater 22-warm air core 23-first pipeline 16 in sequence under the drive of the second electric water pump 26. When the PTC heater 21 and / or the hydrogen combustion heater 22 are started, the coolant can be heated and then used for the low temperature start of the fuel cell stack 11. When the temperature of the fuel cell stack 11 can meet the working requirements, the C1 interface and the A1 interface of the first three-way valve 24 can be connected, and the B1 interface can be disconnected. At this time, under the drive of the second electric water pump 26, the coolant circulates along the medium side of the heat exchanger-PTC heater 21-hydrogen combustion heater 22-warm air core 23-second electric water pump 26-medium side of the heat exchanger.

[0081] The power battery temperature control circuit includes a power battery 31, a second three-way valve 32, a third electric water pump 33 and a cooler 34. The second three-way valve 32 includes an A2 interface, a B2 interface and a C2 interface, wherein the C2 interface can be selectively connected to the A2 interface and the B2 interface. The first interface is connected to the inlet of the heat exchange side of the heat exchanger, and the second interface is respectively connected to the outlet of the heat exchange side of the heat exchanger and the outlet of the third electric water pump 33. The inlet of the third electric water pump 33 is connected to the cooler 34, the cooler 34 is connected to the power battery 31, and the power battery 31 is connected to the C2 interface.

[0082] Specifically, when the C1 interface and the A1 interface of the second three-way valve 32 are connected and the B1 interface is disconnected, under the drive of the third electric water pump 33, the coolant flows sequentially along the path of the third electric water pump 33-heat exchange side of the heat exchanger-power battery 31-cooler 34-third electric water pump 33. At this time, if the power battery 31 needs to be started at low temperature, the PTC heater 21 or the hydrogen combustion heater 22 can be turned on, and the coolant in the power battery temperature control circuit can be heat exchanged through the heat exchanger 25, so that the coolant flowing through the power battery 31 can heat up the power battery 31. If the temperature of the power battery 31 is high, the PTC heater 21 or the hydrogen combustion heater 22 can be turned off, and the coolant in the power battery temperature control circuit can be cooled down through the heat exchanger 25, so that the power battery 31 can be cooled down. At this time, the heat exchanged to the heating circuit can be supplied to the heater core 23. When the power battery 31 is overheated, it is necessary to quickly dissipate the heat of the power battery 31. At this time, the C1 interface and the B1 interface of the second three-way valve 32 can be connected, and the A1 interface can be disconnected. The coolant flows along the path of the third electric water pump 33--power battery 31-cooler 34-third electric water pump 33 in sequence, and the temperature-controlled air conditioner 4 is turned on to provide cooling capacity to the cooler 34, and the coolant flowing through the cooler 34 is quickly cooled down, thereby quickly cooling down the power battery 31.

[0083] The first temperature sensor 51 is used to collect the temperature of the coolant flowing out of the fuel cell stack 11; the second temperature sensor 52 is used to collect the temperature of the coolant flowing out of the medium side of the heat exchanger; the third temperature sensor 53 is used to collect the temperature of the coolant flowing out of the third electric water pump 33; the fourth temperature sensor 54 is used to collect the temperature of the coolant flowing out of the heater core 23.

[0084] The thermal management system of the plug-in fuel cell hybrid vehicle is equipped with a hydrogen combustion heating device and a PTC heater 21. The hydrogen combustion heating device or the PTC heater 21 can be used to warm up the fuel cell stack 11, or to warm up the power battery 31, or to warm up both components at the same time; at the same time, during the warm-up process, if the driver has a demand for air conditioning and heating, the hydrogen combustion heating device and the PTC heater 21 can also provide heating needs for the driver while warming up; based on the driver's demand for air conditioning and heating, on the basis of the hydrogen combustion heating device or the PTC heater 21, if the waste heat generated by the fuel cell stack 11 is sufficient, the waste heat generated by the fuel cell stack 11 can also be used to supplement the heating, so as to make full use of the waste heat of the stack to heat the driver.

[0085] Alternatively, if Figure 2As shown, the thermal management system of the plug-in fuel cell hybrid vehicle also includes a hydrogen bottle 71, which supplies hydrogen to the hydrogen combustion heater 22 through a first hydrogen supply pipeline, and the hydrogen bottle 71 supplies hydrogen to the fuel cell stack 11 through a second hydrogen supply pipeline; the thermal management system of the plug-in fuel cell hybrid vehicle also includes a first solenoid valve 72 and a second solenoid valve 73, the first solenoid valve 72 is arranged in the first hydrogen supply pipeline, and the first solenoid valve 72 is used to control the opening of the first hydrogen supply pipeline; the second solenoid valve 73 is arranged in the second hydrogen supply pipeline, and the second solenoid valve 73 is used to control the opening of the second hydrogen supply pipeline. Preferably, the first solenoid valve 72 and the second solenoid valve 73 are both electrically controlled proportional valves.

[0086] Alternatively, if Figure 3 As shown, the thermal management system of the plug-in fuel cell hybrid electric vehicle also includes a control module, which includes a VCU (vehicle control unit) 61, a BMS (battery management system) 62, an AC (air conditioning controller) 63 and a FCCU (fuel cell stack control unit) 64.

[0087] Among them, VCU61 is responsible for the on / off control of the cooling fan 13, the first electric water pump 14, the thermostat 15, the first three-way valve 24, the second electric water pump 26, the hydrogen combustion heater 22, and the PTC heater 21.

[0088] BMS62 is responsible for collecting the coolant temperature of the power battery temperature control circuit by setting the third temperature sensor 53, and is used to send a cooling request to AC63. BMS62 is also used to control the second three-way valve 32 and the third electric water pump 33. BMS62 can also collect the temperature of the power battery 31 through the battery temperature sensor set on the power battery 31.

[0089] AC63 is responsible for controlling the wind speed of the heater core 23 and the cooling capacity of the temperature control air conditioner 4 to the cooler 34, and is mainly used for controlling the cooling of the power battery 31 when it is overheated. At the same time, AC63 also collects the temperature of the front and rear ends of the heating circuit through the second temperature sensor 52 and the fourth temperature sensor 54 and sends it to VCU61. At the same time, AC63 also sends the target heating temperature of the heater core 23 to VCU61.

[0090] FCCU64 is responsible for controlling the hydrogen supply of the fuel cell stack 11 and controlling the hydrogen supply of the hydrogen combustion heater 22. FCCU64 collects the pressure signal of the hydrogen bottle 71 through the pressure sensor and sends it to VCU61; FCCU64 obtains the temperature collected by the first temperature sensor 51 and sends it to VCU61; FCCU64 accepts and executes the control instructions issued by VCU61 on the opening of the first solenoid valve 72 and the second solenoid valve 73.

[0091] In this embodiment, the thermal management system of the plug-in fuel cell hybrid electric vehicle has a non-operating mode, a warm-up mode, a warm-air warm-up mode, a normal air conditioning mode and a normal cooling mode.

[0092] Among them, in the non-working mode, the coolant is in a non-flowing state in the pipeline, the electric water pumps do not work, the solenoid valves are in their original positions, the radiator 12 and the cooling fan 13 do not work, the hydrogen combustion heater 22 and the PTC heater 21 do not work, and the temperature control air conditioner 4 does not work.

[0093] The warm-up mode refers to a mode in which, when the vehicle is in normal startup state, if VCU61 detects that the temperature reported by the power battery 31 is lower than a certain threshold, or the temperature of the fuel cell stack temperature control circuit is lower than a certain threshold, and the driver has no demand for air conditioning and heating, VCU61 controls the PTC heater 21 or the combustion heater to be in working state, so as to heat the fuel cell stack 11 or the power battery 31 to their respective normal operating temperature range.

[0094] The heating warm-up mode means that when the vehicle is in normal starting state, if VCU61 detects that the temperature reported by the power battery 31 is lower than a certain threshold, or the temperature of the fuel cell stack temperature control circuit is lower than a certain threshold, and the driver has air conditioning and heating requirements, VCU61 controls the PTC heater 21 or the hydrogen combustion heater 22 to be in working state, heats the fuel cell stack 11 or the power battery 31 to their respective normal operating temperature range and provides heat for the heater core 23.

[0095] Normal air conditioning mode refers to a mode in which, when the vehicle is in normal startup state, if VCU61 detects that the temperature reported by the power battery 31 is higher than a certain threshold and the temperature of the fuel cell stack temperature control circuit is higher than a certain threshold, and the driver has a demand for air conditioning and heating, VCU61 controls the PTC heater 21 to be in working state, or the hydrogen combustion heater 22 to be in working state, or circulates the waste heat generated by the reaction of the fuel cell stack 11 to heat the heating core 23, and makes the temperature of the fuel cell stack 11 and the power battery 31 within a suitable operating temperature range. It should be noted that in this mode, both the fuel cell stack 11 and the power battery 31 are warmed up.

[0096] Normal cooling mode refers to a mode in which, when the vehicle is in normal startup state and the driver has no request for air conditioning and heating, and the temperature of the power battery 31 and the temperature of the fuel cell stack 11 are not within the warm-up range, VCU61 controls the various electric water pumps of the thermal management system, and the solenoid valves work to keep the power battery 31 and the fuel cell stack 11 within a reasonable operating temperature range.

[0097] The thermal management system of the plug-in fuel cell hybrid vehicle switches among the above-mentioned non-operating mode, warm-up mode, warm air warm-up mode, normal air conditioning mode and normal cooling mode to adapt to different needs of the hybrid vehicle.

[0098] like Figure 4 As shown, this embodiment also provides a control method for a plug-in fuel cell hybrid electric vehicle thermal management system, which can be implemented by the above-mentioned plug-in fuel cell hybrid electric vehicle thermal management system. Specifically, the control method for the plug-in fuel cell hybrid electric vehicle thermal management system includes the following steps:

[0099] S10: The vehicle starts.

[0100] After starting the vehicle, confirm that the vehicle is in a ready state. If the vehicle is not in a ready state, the thermal management system of the plug-in fuel cell hybrid vehicle is in an inoperative mode. If the vehicle is not in a ready state, execute S20.

[0101] S20: Determine whether the driver has an air conditioning heating request. If the driver has no air conditioning heating request, execute S30.

[0102] When the driver has an air conditioning heating request, the driver operates the air conditioning control button, and AC63 determines the position of the air conditioning control button and generates request information. Specifically, the air conditioning control button has a position for turning off the air conditioning and a position for turning on the air conditioning heating, and when the air conditioning control button is in the heating turning-on position, there is a certain temperature adjustment space.

[0103] S30 : Acquire the actual temperature T1 of the power battery 31 and acquire the temperature T2 collected by the first temperature sensor 51 .

[0104] Specifically, the BMS 62 collects the actual temperature of the power battery 31 through the battery temperature sensor provided on the power battery 31 and sends it to the VCU 61, and the FCCU 64 obtains the temperature collected by the first temperature sensor 51 and sends it to the VCU 61. Among them, since the temperature collected by the first temperature sensor 51 is the temperature of the coolant flowing out of the fuel cell stack 11, T2 can represent the actual temperature of the fuel cell stack 11 at this time.

[0105] S40: Compare T1 with the first set temperature Th1, and T2 with the second set temperature Th2; if T1<Th1, or T2<Th2; then execute S50. Among them, Th1 is the temperature threshold of the power battery 31 in the warm-up mode; Th2 is the temperature threshold of the fuel cell stack 11 in the warm-up mode. When T1<Th1, it indicates that the power battery 31 needs to be heated to ensure its normal activation. When T2<Th2, it indicates that the fuel cell stack 11 needs to be heated to ensure its normal activation. Therefore, when T1<Th1, or T2<Th2, at least one of the power battery 31 and the fuel cell stack 11 needs to be heated.

[0106] S50: Start the warm-up mode.

[0107] The warm-up mode is turned on when: the A1 interface of the first three-way valve 24 is disconnected, the B1 interface is connected to the C1 interface, the first interface of the thermostat 15 is disconnected, the second interface is connected to the third interface, the first electric water pump 14, the second electric water pump 26 and the third electric water pump 33 are turned on, the hydrogen combustion heater 22 or the PTC heater 21 is turned on; the B2 interface of the second three-way valve 32 is disconnected, the A2 interface is connected to the C2 interface, and the temperature control air conditioner 4 is turned off. At this time, the circulation flow path of the coolant in the heating circuit and the fuel cell stack temperature control circuit is fuel cell stack 11-first three-way valve 24-second electric water pump 26-heater-PTC heater 21-hydrogen combustion heater 22-warm air core 23-thermostat 15-first electric water pump 14-fuel cell stack 11. The fuel cell stack 11 is heated by the PTC heater 21 or the hydrogen combustion heater 22. The circulation flow path of the coolant in the power battery temperature control circuit is power battery 31-cooler 34-third electric water pump 33-heat exchanger 25-second three-way valve 32-power battery 31. When the PTC heater 21 or the hydrogen combustion heater 22 is heated, the coolant in the power battery temperature control circuit absorbs heat from the heat exchanger 25 and heats the power battery 31.

[0108] It should be noted that, as for the warm-up mode, whether heating is performed by the hydrogen combustion heater 22 or by the PTC heater 21, see the definition below for details. Among them, when the hydrogen combustion heater 22 is in the working state, VCU61 calculates the amount of hydrogen entering the hydrogen combustion heater 22 according to the actual temperature T1 of the power battery 31 reported by BMS62 and the actual temperature T2 representing the fuel cell stack 11 reported by FCCU64, and the collected pressure of the hydrogen bottle 71, and converts it into a duty cycle signal of the first solenoid valve 72 in response, and sends it to FCCU64, which controls the first solenoid valve 72 to control the input amount of hydrogen with the duty cycle. Specifically, VCU61 pre-stores a map1 of the actual temperature of the power battery 31, the actual temperature of the fuel cell stack 11, the pressure of the hydrogen bottle 71, and the hydrogen input amount. By querying the map1 with the collected actual temperature T1 of the power battery 31, the actual temperature T2 of the fuel cell stack 11, and the pressure of the hydrogen bottle 71, the corresponding hydrogen input amount can be obtained.

[0109] In S40, if T1≥Th1 and T2≥Th2, S60 is executed.

[0110] S60: Turn on normal cooling mode.

[0111] Starting the normal cooling mode includes: the hydrogen combustion heater 22 and the PTC heater 21 are both turned off, the C1 interface of the first three-way valve 24 is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump 26 is turned off, the hydrogen combustion heater 22 and the PTC heater 21 are both turned off, the second interface of the thermostat 15 is disconnected, the first interface and the third interface are connected, the first electric water pump 14 is turned on, and the third electric water pump 33 is turned on.

[0112] When T1≥Th1, and T2≥Th2, it indicates that the temperature of the power battery 31 and the fuel cell stack 11 has met the minimum threshold for starting, and the power battery 31 and the fuel cell stack 11 need to be cooled. At this time, the heating circuit and the fuel cell stack temperature control circuit are isolated by the first three-way valve 24, and the heating circuit stops heating. The circulation flow path of the coolant in the fuel cell stack temperature control circuit is fuel cell stack 11-first three-way valve 24-thermostat 15-radiator 12-first electric water pump 14-fuel cell stack 11. Whether the cooling fan 13 is turned on can be controlled according to whether the fuel cell stack 11 is working. Specifically, when the fuel cell stack 11 is working, the cooling fan 13 is turned on, and according to the linear correlation between the speed of the cooling fan 13 and the temperature of the fuel cell stack 11, the speed of the cooling fan 13 increases with the increase of the temperature of the fuel cell stack 11.

[0113] The circulation flow path of the coolant in the power battery temperature control circuit can be divided into different paths according to the temperature of the power battery 31. Specifically, starting the normal cooling mode also includes:

[0114] Comparing T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1>Th1, and when the temperature of the power battery 31 reaches Tbat2, the power battery 31 generates a large amount of waste heat, which needs to be quickly dissipated.

[0115] If T1>Tbat2, the A2 interface of the second three-way valve 32 is disconnected, the B2 interface and the C2 interface are connected, and the temperature control air conditioner 4 delivers cold air to the cooler 34. At this time, the temperature of the power battery 31 is too high, and the circulation flow path of the coolant in the power battery temperature control circuit is power battery 31-cooler 34-third electric water pump 33-heat exchanger 25-second three-way valve 32-power battery 31. The power battery 31 is quickly cooled down through the cooler 34, and the speed of the third electric water pump 33 reaches the maximum.

[0116] If T1<Tbat1, the B2 interface of the second three-way valve 32 is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner 4 is turned off. At this time, the BMS 62 controls the rotation speed of the third electric water pump 33 to change linearly within a certain value.

[0117] In S20 , if the driver has requested air conditioning and heating, S70 is executed.

[0118] S70 : Acquire the actual temperature T1 of the power battery 31 and collect the temperature T2 collected by the first temperature sensor 51 .

[0119] S80: Compare T1 with the third set temperature Th3, and compare T2 with the fourth set temperature Th4.

[0120] If T1>Th3, and T2>Th4, then S90 is executed. Th3 is the temperature threshold of the power battery 31 in the warm air warm-up mode; Th4 is the temperature threshold of the fuel cell stack 11 in the warm air warm-up mode.

[0121] S90: Turn on normal air conditioning mode.

[0122] When T1>Th3, it indicates that the power battery 31 has completed warming up and can be used normally, otherwise the power battery 31 needs to be heated to ensure its normal start. When T2>Th4, it indicates that the fuel cell stack 11 has completed warming up and can be used normally, otherwise the fuel cell stack 11 needs to be heated to ensure its normal start. It should be noted that Th3 and Th1 can be equal or different, and Th4 and Th2 can be equal or different.

[0123] The normal air conditioning mode includes: comparing T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1; if T1>Tbat2, the third electric water pump 33 is turned on, the A2 interface of the second three-way valve 32 is disconnected, the B2 interface and the C2 interface are connected, and the temperature control air conditioner 4 delivers cold to the cooler 34; if T1<Tbat1, the third electric water pump 33 is turned on, the B2 interface of the second three-way valve 32 is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner 4 is turned off. In this way, the cooling operation of the power battery 31 can be achieved.

[0124] The normal air conditioning mode also includes: determining whether the fuel cell stack 11 is in working condition; if the fuel cell stack 11 is not in working condition, then comparing T2 and the set air conditioning warm air temperature TAC63, TAC63>Th2. The set air conditioning warm air temperature TAC63 is the target temperature set by the driver to adjust the cab through the warm air core 23. If T2>TAC63, it means that the waste heat of the fuel cell stack 11 can be used to supply heat to the warm air core 23. At this time, the A1 interface of the first three-way valve 24 is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump 26 is turned on, the hydrogen combustion heater 22 and the PTC heater 21 are both turned off, the second interface of the thermostat 15 is disconnected, the first interface and the third interface are connected, and the first electric water pump 14 is turned on. At this time, the circulation flow path of the coolant in the heating circuit and the fuel cell stack temperature control circuit is fuel cell stack 11-first three-way valve 24-second electric water pump 26-heater-PTC heater 21-hydrogen combustion heater 22-warm air core 23-thermostat 15-first electric water pump 14-fuel cell stack 11, and heat is supplied to the warm air core 23 only by the waste heat of the fuel cell stack 11.

[0125] If T2≤TAC63, it means that the waste heat of the fuel cell stack 11 cannot be used to supply heat to the heater core 23. The C1 interface of the first three-way valve 24 is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump 26 is turned on, the hydrogen combustion heater 22 or the PTC heater 21 is turned on, and the first electric water pump 14 is turned off. At this time, the heating circuit and the fuel cell stack temperature control circuit are separated by the first three-way valve 24, and the coolant in the heating circuit circulates in a closed loop, and the hydrogen combustion heater 22 or the PTC heater 21 supplies heat to the heater core 23.

[0126] If the fuel cell stack 11 is in working condition, T2 and the set air conditioning warm air temperature TAC63 are compared; if T2>TAC63, the hydrogen combustion heater 22 and the PTC heater 21 are both closed, the A1 interface of the first three-way valve 24 is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump 26 is turned on, the second interface of the thermostat 15 is disconnected, the first interface and the third interface are connected, and the first electric water pump 14 is turned on, which is equivalent to the effect when the above-mentioned fuel cell stack 11 is not in working condition and T2>TAC63.

[0127] If T2≤TAC63, obtain the temperature T3 detected by the fourth temperature sensor 54 and compare T2 and T3. If T2>T3, it indicates that the temperature of the coolant flowing out of the fuel cell stack 11 is between the current cooling temperature entering the heater core 23 and the temperature flowing out of the heater core 23, and the fuel cell stack 11 still has some residual heat that can be supplied to the heater core 23. Therefore, the hydrogen combustion heater 22 or the PTC heater 21 is turned on, the A1 interface of the first three-way valve 24 is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump 26 is turned on, the first interface of the thermostat 15 is disconnected, the second interface and the third interface are connected, and the first electric water pump 14 is turned on; at this time, the circulation flow path of the coolant in the heating circuit and the fuel cell stack temperature control circuit is fuel cell stack 11-first three-way valve 24-second electric water pump 26-heater-PTC heater 21-hydrogen combustion heater 22-warm air core 23-thermostat 15-first electric water pump 14-fuel cell stack 11. While utilizing the waste heat of the fuel cell stack 11, heat is also supplied to the warm air core 23 through the hydrogen combustion heater 22 or the PTC heater 21.

[0128] If T2≤T3, it indicates that the coolant flowing out of the fuel cell stack 11 is completely insufficient to supply heat to the heater core 23. In order to avoid energy loss in the heating circuit, the C1 interface of the first three-way valve 24 is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump 26 is turned on, the hydrogen combustion heater 22 or the PTC heater 21 is turned on, the second interface of the thermostat 15 is disconnected, the first interface and the third interface are connected, and the first electric water pump 14 is turned on. At this time, the heating circuit and the fuel cell stack temperature control circuit are separated by the first three-way valve 24, and the coolant in the heating circuit circulates in a closed loop to supply heat to the heater core 23 through the hydrogen combustion heater 22 or the PTC heater 21.

[0129] In step S80, if T1≤Th3, or T2≤Th4, then S100 is executed.

[0130] When T1≤Th3, or T2≤Th4, it indicates that at least one of the power battery 31 and the fuel cell stack 11 needs to be heated to ensure normal activation, while also taking into account the air conditioning heating demand.

[0131] S100: Turn on the heating mode.

[0132] The heating mode is turned on including: the A1 interface of the first three-way valve 24 is disconnected, the B1 interface is connected to the C1 interface, the first interface of the thermostat 15 is disconnected, the second interface is connected to the third interface, the first electric water pump 14, the second electric water pump 26 and the third electric water pump 33 are turned on, the hydrogen combustion heater 22 or the PTC heater 21 is turned on; the B2 interface of the second three-way valve 32 is disconnected, the A2 interface is connected to the C2 interface, and the temperature control air conditioner 4 is turned off. At this time, the circulation flow path of the coolant in the heating circuit and the fuel cell stack temperature control circuit is fuel cell stack 11-first three-way valve 24-second electric water pump 26-heater-PTC heater 21-hydrogen combustion heater 22-heat core 23-thermostat 15-first electric water pump 14-fuel cell stack 11. The circulation flow path of the coolant in the power battery temperature control circuit is power battery 31-cooler 34-third electric water pump 33-heat exchanger 25-second three-way valve 32-power battery 31. Heat is supplied to the heater core 23 through the hydrogen combustion heater 22 or the PTC heater 21, and the fuel cell stack 11 is heated at the same time. The medium side of the heat exchanger is also heated so that the coolant in the power battery temperature control circuit absorbs heat from the heat exchanger 25 and heats the power battery 31.

[0133] When the hydrogen combustion heater 22 is in the working state, VCU61 calculates the amount of hydrogen entering the hydrogen combustion heater 22 according to the actual temperature T1 of the power battery 31 reported by BMS62 and the actual temperature T2 of the fuel cell stack 11 reported by FCCU64, the set air conditioning warm air temperature TAC63, and the collected pressure of the hydrogen bottle 71, and converts it into a duty cycle signal of the first solenoid valve 72 in response, and sends it to FCCU64, which controls the first solenoid valve 72 to control the input amount of hydrogen with the duty cycle. Specifically, VCU61 pre-stores a map1 of the actual temperature of the power battery 31, the actual temperature of the fuel cell stack 11, the set air conditioning warm air temperature, the pressure of the hydrogen bottle 71, and the hydrogen input amount. By querying the map1 with the collected actual temperature T1 of the power battery 31, the actual temperature T2 of the fuel cell stack 11, the set air conditioning warm air temperature TAC63, and the pressure of the hydrogen bottle 71, the corresponding hydrogen input amount can be obtained.

[0134] like Figure 5 As shown, the control method of the thermal management system of the plug-in fuel cell hybrid electric vehicle further includes step S110 located after steps S50 and S100.

[0135] S110: Determine a heating mode.

[0136] Determine the heating mode including:

[0137] S111 : Acquire the actual charge SOC of the power battery 31 and the actual discharge power P of the power battery 31 .

[0138] S112: Compare the SOC with the set power SOC1, and the P with the set discharge power P1.

[0139] If SOC>SOC1 and P>P1, execute S113; if SOC≤SOC1, or P≤P1, execute S114.

[0140] S113: Turn on the hydrogen combustion heater 22 and turn off the PTC heater 21.

[0141] S114: Turn off the hydrogen combustion heater 22 and turn on the PTC heater 21.

[0142] Wherein, SOC1 is the power threshold of the power battery 31 when the PTC heater 21 is heating; P1 is the discharge power threshold of the power battery 31 when the PTC heater 21 is heating.

[0143] Optionally, after the normal air-conditioning mode is turned on, if T2>T3, regardless of whether the fuel cell stack is in a working state, step S110 is executed.

[0144] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A control method for a thermal management system of a plug-in fuel cell hybrid electric vehicle, characterized in that: The invention is implemented by a plug-in fuel cell hybrid electric vehicle thermal management system, wherein the plug-in fuel cell hybrid electric vehicle thermal management system comprises: A fuel cell stack temperature control circuit, comprising a fuel cell stack (11), a radiator (12), a cooling fan (13), a first electric water pump (14) and a thermostat (15), wherein the radiator (12) is connected to the fuel cell stack (11) via a first pipeline (16) and a second pipeline (17), respectively, and the thermostat (15) comprises a first interface, a second interface and a third interface, wherein the first interface and the third interface are connected in series to the first pipeline (16), and the coolant flowing through the fuel cell stack (11) flows into the third interface, the first interface is used to transport the coolant to the radiator (12), the second interface is connected to the second pipeline (17), the first electric water pump (14) is arranged on the second pipeline (17) and is used to drive the coolant to flow to the fuel cell stack (11), and the cooling fan (13) is used to cool the radiator (12); A heating circuit, comprising a PTC heater (21), a hydrogen combustion heater (22), a heater core (23), a first three-way valve (24), a heat exchanger (25) and a second electric water pump (26); the outlet of the medium side of the heat exchanger (25), the PTC heater (21), the hydrogen combustion heater (22) and the heater core (23) are sequentially connected in series; the first three-way valve (24) comprises an A1 interface, a B1 interface and a C1 interface; the A1 interface is connected to the heater core (23); the B1 interface is connected to the inlet of the second electric water pump (26); the C1 interface is connected to the first pipeline (16); and the connection position of the C1 interface and the first pipeline (16) is located between the thermostat (15) and the fuel cell stack (11); the outlet of the second electric water pump (26) is connected to the outlet of the medium side of the heat exchanger (25); and the heater core (23) is also connected to the first pipeline (16); A power battery temperature control circuit, comprising a power battery (31), a second three-way valve (32), a third electric water pump (33) and a cooler (34), wherein the second three-way valve (32) comprises an A2 interface, a B2 interface and a C2 interface, wherein the first interface is connected to an inlet of a heat exchange side of the heat exchanger (25), the second interface is respectively connected to an outlet of the heat exchange side of the heat exchanger (25) and an outlet of the third electric water pump (33), the inlet of the third electric water pump (33) is connected to the cooler (34), the cooler (34) is connected to the power battery (31), and the power battery (31) is connected to the C2 interface; A temperature-controlled air conditioner (4) for providing cooling to the cooler (34); A first temperature sensor (51), the first temperature sensor (51) being used to collect the temperature of the coolant flowing out of the fuel cell stack (11); a second temperature sensor (52), the second temperature sensor (52) being used to collect the temperature of the coolant flowing out from the medium side of the heat exchanger (25); a third temperature sensor (53), the third temperature sensor (53) being used to collect the temperature of the coolant flowing out of the third electric water pump (33); a fourth temperature sensor (54), the fourth temperature sensor (54) being used to collect the temperature of the coolant flowing out of the heater core (23); The control method of the plug-in fuel cell hybrid electric vehicle thermal management system comprises: Vehicle start; Determine whether the driver has a request for air conditioning and heating; If the driver does not request air conditioning heating, the actual temperature T1 of the power battery (31) is obtained and the temperature T2 collected by the first temperature sensor (51) is obtained; Compare T1 with the first set temperature Th1, and compare T2 with the second set temperature Th2; If T1<Th1, or T2<Th2; Then turn on the warm-up mode; Turning on the warm-up mode includes: disconnecting the A1 interface of the first three-way valve (24), connecting the B1 interface to the C1 interface, disconnecting the first interface of the thermostat (15), connecting the second interface to the third interface, turning on the first electric water pump (14), the second electric water pump (26) and the third electric water pump (33), turning on the hydrogen combustion heater (22) or the PTC heater (21); disconnecting the B2 interface of the second three-way valve (32), connecting the A2 interface to the C2 interface, and turning off the temperature control air conditioner (4); If the driver has a request for air conditioning heating, the actual temperature T1 of the power battery (31) is obtained and the temperature T2 collected by the first temperature sensor (51) is collected; Compare T1 with the third set temperature Th3, and compare T2 with the fourth set temperature Th4; If T1>Th3, and T2>Th4, then turn on the normal air conditioning mode; The normal air conditioning mode includes: Compare T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1; If T1>Tbat2, the third electric water pump (33) is turned on, the A2 interface of the second three-way valve (32) is disconnected, the B2 interface and the C2 interface are connected, and the temperature-controlled air conditioner (4) delivers cold air to the cooler (34); If T1<Tbat1, the third electric water pump (33) is turned on, the B2 interface of the second three-way valve (32) is disconnected, the A2 interface and the C2 interface are connected, and the temperature control air conditioner (4) is turned off; If T1≤Th3, or T2≤Th4, the heating mode is turned on; The heating mode is activated, including: the A1 interface of the first three-way valve (24) is disconnected, the B1 interface is connected to the C1 interface, the first interface of the thermostat (15) is disconnected, the second interface is connected to the third interface, the first electric water pump (14), the second electric water pump (26) and the third electric water pump (33) are activated, the hydrogen combustion heater (22) or the PTC heater (21) is activated; the B2 interface of the second three-way valve (32) is disconnected, the A2 interface is connected to the C2 interface, and the temperature control air conditioner (4) is turned off; After the heating mode is turned on or the warm-up mode is turned on, the thermal management system of the plug-in fuel cell hybrid electric vehicle further includes: Determining a heating mode, wherein determining the heating mode comprises: Obtaining the actual charge SOC of the power battery (31) and the actual discharge power P of the power battery (31); Compare the SOC with the set power SOC1, and the P with the set discharge power P1; If SOC>SOC1, and P>P1, the hydrogen combustion heater (22) is turned on and the PTC heater (21) is turned off; If SOC≤SOC1, or P≤P1, the hydrogen combustion heater (22) is turned off and the PTC heater (21) is turned on.

2. The control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle according to claim 1, characterized in that: The plug-in fuel cell hybrid electric vehicle thermal management system further comprises a hydrogen cylinder (71), wherein the hydrogen cylinder (71) supplies hydrogen to the hydrogen combustion heater (22) through a first hydrogen supply pipeline, and the hydrogen cylinder (71) supplies hydrogen to the fuel cell stack (11) through a second hydrogen supply pipeline; The plug-in fuel cell hybrid electric vehicle thermal management system further comprises a first solenoid valve (72) and a second solenoid valve (73); the first solenoid valve (72) is arranged on the first hydrogen supply pipeline, and the first solenoid valve (72) is used to control the opening of the first hydrogen supply pipeline; the second solenoid valve (73) is arranged on the second hydrogen supply pipeline, and the second solenoid valve (73) is used to control the opening of the second hydrogen supply pipeline.

3. The control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle according to claim 2, characterized in that: The first solenoid valve (72) and the second solenoid valve (73) are both electrically controlled proportional valves.

4. The control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle according to any one of claims 1 to 3, characterized in that: If T1≥Th1, and T2≥Th2, then start the normal cooling mode; Turning on the normal cooling mode includes: the hydrogen combustion heater (22) and the PTC heater (21) are both turned off, the C1 interface of the first three-way valve (24) is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump (26) is turned off, the hydrogen combustion heater (22) and the PTC heater (21) are both turned off, the second interface of the thermostat (15) is disconnected, the first interface and the third interface are connected, the first electric water pump (14) is turned on, and the third electric water pump (33) is turned on; Compare T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, Tbat2>Tbat1; If T1>Tbat2, the A2 interface of the second three-way valve (32) is disconnected, the B2 interface and the C2 interface are connected, and the temperature-controlled air conditioner (4) delivers cold air to the cooler (34); If T1<Tbat1, the B2 interface of the second three-way valve (32) is disconnected, the A2 interface and the C2 interface are connected, and the temperature-adjusting air conditioner (4) is turned off.

5. The control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle according to any one of claims 1 to 3, characterized in that: After comparing T1 with the first threshold temperature Tbat1 and the second threshold temperature Tbat2, the normal air conditioning mode further includes: Determining whether the fuel cell stack (11) is in an operating state; If the fuel cell stack (11) is not in the working state, then compare T2 with the set air conditioning warm air temperature TAC (63); If T2>TAC (63), the hydrogen combustion heater (22) and the PTC heater (21) are both turned off, the A1 interface of the first three-way valve (24) is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump (26) is turned on, the second interface of the thermostat (15) is disconnected, the first interface and the third interface are connected, and the first electric water pump (14) is turned on; If T2≤TAC(63); the hydrogen combustion heater (22) or the PTC heater (21) is turned on, the C1 interface of the first three-way valve (24) is disconnected, the A1 interface and the B1 interface are connected, the second electric water pump (26) is turned on, the second interface of the thermostat (15) is disconnected, the first interface and the third interface are connected, and the first electric water pump (14) is turned on.

6. The control method of the thermal management system of a plug-in fuel cell hybrid electric vehicle according to claim 5, characterized in that: If the fuel cell stack (11) is in the working state, then compare T2 with the set air conditioning warm air temperature TAC (63); If T2>TAC (63), the hydrogen combustion heater (22) and the PTC heater (21) are both turned off, the A1 interface of the first three-way valve (24) is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump (26) is turned on, the second interface of the thermostat (15) is disconnected, the first interface and the third interface are connected, and the first electric water pump (14) is turned on; If T2≤TAC(63), obtaining the temperature T3 detected by the fourth temperature sensor (54); Compare the sizes of T2 and T3; If T2>T3, the A1 interface of the first three-way valve (24) is disconnected, the C1 interface and the B1 interface are connected, the second electric water pump is turned on, the hydrogen combustion heater (22) or the PTC heater (21) is turned on, the first interface of the thermostat (15) is disconnected, the second interface and the third interface are connected, and the first electric water pump (14) is turned on; If T2≤T3, the hydrogen combustion heater (22) and the PTC heater (21) are both turned off, the C1 interface of the first three-way valve (24) is disconnected, the A1 interface and the B1 interface are connected, the two electric water pumps are turned on, the hydrogen combustion heater (22) or the PTC heater (21) is turned on, the second interface of the thermostat (15) is disconnected, the first interface and the third interface are connected, and the first electric water pump (14) is turned on.

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