Hybrid tractor thermal management system, method, equipment and medium

Abstract

The invention relates to a hybrid tractor thermal management system, method, device and medium, the system comprises a battery thermal management module and a tractor waste heat management module, the battery thermal management module comprises a battery pack cooling loop, a first battery pack heating loop and a second battery pack heating loop, the tractor waste heat management module comprises an electric drive cooling loop and an engine heat loop. When the current temperature of the battery pack is lower than the battery temperature range and higher than a preset temperature limit value, controlling the electrically-driven cooling loop to exchange heat with the first battery pack heating loop; and when the current temperature of the battery pack is lower than a temperature limit value, an engine thermal loop is controlled to be communicated with a second battery pack heating loop, so that the heated cooling liquid in the engine thermal loop enters the second battery pack heating loop, and the battery pack is heated. The battery pack heating device has the effects of saving resources and improving the battery pack heating efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of tractor thermal management, and in particular to a hybrid tractor thermal management system, method, device and medium. Background Art

[0002] Hybrid tractors are new tractor products that use both fuel and electricity as energy. As an important driver of modern agricultural mechanization, hybrid agricultural machinery has lower power requirements and low fuel costs, and its fuel consumption is 30-50% lower than that of traditional fuel engineering machinery of the same power. Secondly, hybrid tractors have a wider range of uses and more scenarios. However, in actual applications, the heating effect of the battery pack of hybrid tractors in low temperature environments has gradually emerged, becoming an important factor restricting its performance.

[0003] At present, the battery pack has an independently operated battery thermal management module. When the battery pack temperature exceeds the preset temperature range, the battery thermal management module starts to work and heats or cools the battery pack. However, the battery thermal management module needs to set up an additional heat source, which consumes a lot of resources, and the heating efficiency of the battery pack is low. There is an urgent need for a technical solution that saves resources and can improve the heating efficiency of the battery pack. Summary of the invention

[0004] In order to save resources and improve the heating efficiency of the battery pack, the present application provides a hybrid tractor thermal management method, device, equipment and medium.

[0005] In a first aspect, the present application provides a hybrid tractor thermal management method, comprising a battery thermal management module and a tractor waste heat management module, the battery thermal management module comprising a battery pack cooling circuit, a first battery pack heating circuit and a second battery pack heating circuit, the tractor waste heat management module comprising an electric drive cooling circuit and an engine heat circuit; When the current temperature of the battery pack is higher than a preset battery temperature range, turning on the battery pack cooling circuit to cool the battery pack; When the current temperature of the battery pack is lower than the battery temperature range and higher than a preset temperature limit value, controlling the electric drive cooling circuit to perform heat exchange with the first battery pack heating circuit; When the current temperature of the battery pack is lower than the temperature limit value, the engine thermal circuit is controlled to be connected to the second battery pack heating circuit so that the heated coolant in the engine thermal circuit enters the second battery pack heating circuit, and the second battery pack heating circuit heats the battery pack, and the temperature limit value is lower than the battery temperature range.

[0006] The beneficial effects of the present application are as follows: when the current temperature of the battery pack is lower than the preset temperature limit, the engine heat circuit is directly connected to the second battery pack heating circuit, so that the engine coolant in the engine heat circuit can directly enter the second battery pack heating circuit of the battery pack to heat the battery pack, thereby increasing the heating rate of the battery pack and reducing the loss of waste heat. The coolant in the first battery pack heating circuit heats the battery pack by heat exchange with the cooling medium in the electric drive cooling circuit, so that the temperature of the battery pack can be maintained within the battery temperature range, thereby increasing the service life of the battery pack and the battery pack's endurance.

[0007] Further, the battery pack cooling circuit includes a first radiator chamber, a cooler, a refrigerant circuit, a first water pump, a battery pack internal circuit and an exchanger B channel, the first radiator chamber, the refrigerant circuit and the first water pump are respectively connected to the cooler, the first water pump is connected to the battery pack internal circuit, and the battery pack internal circuit and the first radiator chamber are respectively connected to the exchanger B channel; When the current temperature of the battery pack is higher than the preset battery temperature range, the coolant transported out of the first radiator chamber is controlled to perform heat exchange with the refrigerant transported in the refrigerant circuit in the cooler, and the coolant after heat exchange is transported to the battery pack circuit through the first water pump, and the coolant after cooling the battery pack re-enters the first radiator chamber through the exchanger B channel.

[0008] The beneficial effect of adopting the above further scheme is: it is easy to cool the coolant, thereby achieving the purpose of cooling the battery pack by the coolant, so that the temperature of the battery pack can be maintained within the battery temperature range, thereby improving the service life of the battery pack and increasing the battery pack endurance.

[0009] Further, the electric drive cooling circuit includes a motor cooling circuit, and the motor cooling circuit includes a second radiator chamber, a second water pump, a motor internal circuit, a generator internal circuit, a first three-way valve and an exchanger A channel; The first battery pack heating circuit includes the first radiator chamber, the cooler, the first water pump, the battery pack internal circuit and the exchanger B channel; The second radiator chamber and the internal circuit of the motor are respectively communicated with the second water pump, the internal circuit of the motor is also communicated with the internal circuit of the generator, the first three-way valve is communicated with the internal circuit of the generator, the first three-way valve includes a first passage and a second passage, the first passage is communicated with the second radiator chamber, the second passage is communicated with the exchanger A channel, and the exchanger A channel is communicated with the second radiator chamber; When the current temperature of the battery pack is lower than the preset battery temperature range and higher than the temperature limit value, the first passage is controlled to be closed and the second passage is opened, and the coolant transported from the second radiator chamber is transported to the internal circuit of the motor and the internal circuit of the generator in sequence by the second water pump, and the coolant after cooling the motor and the generator enters the exchanger A channel through the second passage, and the coolant in the exchanger A channel performs heat exchange with the coolant in the exchanger B channel, and the coolant after heat exchange in the electric drive cooling circuit re-enters the second radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber; When the current temperature of the battery pack is not lower than a preset battery temperature range and the motor needs to be cooled, the second passage is controlled to be closed and the first passage is opened, and the coolant after cooling the motor and the generator re-enters the second radiator chamber through the first passage.

[0010] The beneficial effect of adopting the above further scheme is: the coolant in the first battery pack heating circuit is heated by the waste heat of the electric motor, thereby improving the utilization rate of heat and reducing heat loss.

[0011] Further, the electric drive cooling circuit includes a hydraulic drive cooling circuit, and the hydraulic drive cooling circuit includes a fourth radiator chamber, a pump motor hydraulic pump, a hydraulic system internal circuit, a second three-way valve and an exchanger C channel; The first battery pack heating circuit includes the first radiator chamber, the cooler, the first water pump, the battery pack internal circuit and the exchanger B channel; The fourth radiator chamber and the hydraulic system internal circuit are respectively communicated with the pump motor hydraulic pump, the second three-way valve is communicated with the hydraulic system internal circuit, the second three-way valve includes a third passage and a fourth passage, the third passage is communicated with the fourth radiator chamber, the fourth passage is communicated with the exchanger C channel, and the exchanger C channel is communicated with the fourth radiator chamber; When the current temperature of the battery pack is lower than a preset battery temperature range and higher than a preset temperature limit value, the third passage is controlled to be closed and the fourth passage is opened, and the cooling oil transported from the fourth radiator chamber is transported to the internal circuit of the hydraulic system through the pump motor hydraulic pump, and the cooling oil after the hydraulic system is cooled enters the exchanger C channel through the fourth passage, and the cooling oil in the exchanger C channel performs heat exchange with the coolant in the exchanger B channel, and the cooling oil after heat exchange in the hydraulic drive cooling circuit re-enters the fourth radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber; When the current temperature of the battery pack is not lower than a preset battery temperature range and the hydraulic system needs to be cooled, the fourth passage is controlled to be closed and the third passage is opened, so that the cooling oil after cooling the hydraulic system re-enters the fourth radiator chamber through the third passage.

[0012] The beneficial effect of adopting the above further scheme is: the coolant in the first battery pack heating circuit is heated by the waste heat of the hydraulic system, thereby improving the utilization rate of heat and reducing heat loss.

[0013] Further, the second battery pack heating circuit includes a first four-way valve, a third three-way valve and a third water pump, the first four-way valve includes a fifth passage, the third three-way valve includes a sixth passage and a seventh passage, the fifth passage is respectively connected to the battery pack internal circuit and the third water pump, and the sixth passage is respectively connected to the battery pack internal circuit and the first water pump; When the current temperature of the battery pack is lower than a preset battery temperature range and higher than the temperature limit value, controlling the sixth path to be opened and closing the seventh path; The engine thermal circuit includes a second four-way valve, an engine internal circuit and a thermostat, the second four-way valve includes an eighth passage and a ninth passage, the third water pump is also connected to the eighth passage, the engine internal circuit is connected to the eighth passage and the thermostat respectively, the thermostat is connected to the ninth passage, and the ninth passage is connected to the seventh passage; When the current temperature of the battery pack is lower than the temperature limit value, the seventh passage is controlled to open and the sixth passage is closed, and the coolant heated in the internal circuit of the engine passes through the thermostat, the ninth passage and the seventh passage, and is directly transported to the internal circuit of the battery pack. The coolant heated in the internal circuit of the battery pack re-enters the internal circuit of the engine through the fifth passage, the third water pump and the eighth passage.

[0014] The beneficial effect of adopting the above further scheme is: when the current temperature of the battery pack is lower than the preset temperature limit value, the engine thermal circuit is directly connected to the second battery pack heating circuit, so that the heated coolant in the engine thermal circuit can directly enter the second battery pack heating circuit of the battery pack to heat the battery pack, thereby increasing the heating rate of the battery pack and reducing the loss of waste heat.

[0015] Further, the first four-way valve further includes a tenth passage, the thermal management system further includes an engine cooling circuit, the engine cooling circuit includes a third radiator chamber, the tenth passage is respectively connected to the third radiator chamber and the third water pump, and the thermostat is also connected to the third radiator chamber; When the current temperature of the battery pack is not lower than a preset temperature limit value and the engine needs to be cooled, the eighth passage and the tenth passage are controlled to be opened, and the fifth passage and the ninth passage are closed, the coolant transported from the third radiator chamber enters the third water pump through the tenth passage, and the coolant is transported to the internal circuit of the engine through the tenth passage by the third water pump, and the coolant after cooling the engine re-enters the third radiator chamber through the thermostat.

[0016] The beneficial effect of adopting the above further solution is that the engine is cooled, so that the engine can operate within a suitable temperature range.

[0017] Further, the second four-way valve further includes an eleventh passage, and the eleventh passage is respectively connected to the thermostat and the internal circuit of the engine; When the engine needs to be heated, the coolant transported from the third radiator chamber is controlled to enter the internal circuit of the engine through the tenth passage and the third water pump. After flowing out of the internal circuit of the engine, the coolant enters the eleventh passage through the thermostat, and the other passages of the second four-way valve are closed to allow the coolant to re-enter the internal circuit of the engine through the eleventh passage.

[0018] The beneficial effect of adopting the above further scheme is: by closing the other passages of the second four-way valve, it is ensured that the coolant can only re-enter the internal circuit of the engine along the eleventh passage, forming a closed loop circulation, so that the coolant continuously circulates inside the engine, continuously absorbing and dissipating the heat of high-temperature components, and at the same time using this heat to heat the entire engine to achieve a more uniform and ideal operating temperature.

[0019] In a second aspect, the present application provides a hybrid tractor thermal management method, comprising: Get the current temperature of the battery pack in real time; If the current temperature of the battery pack is higher than a preset battery temperature range, the battery pack cooling circuit is turned on to cool the battery pack; If the current temperature is lower than the battery temperature range and higher than a preset temperature limit, the electric drive cooling circuit and the first battery pack heating circuit are turned on to control the electric drive cooling circuit to perform heat exchange with the first battery pack heating circuit; If the current temperature of the battery pack is lower than the temperature limit value, the engine thermal circuit and the second battery pack heating circuit are turned on, and the engine thermal circuit is controlled to be connected with the second battery pack heating circuit so that the heated coolant in the engine thermal circuit enters the second battery pack heating circuit, and the second battery pack heating circuit heats the battery pack. The temperature limit value is lower than the battery temperature range.

[0020] In a third aspect, the present application provides an electronic device, including a processor and a memory, wherein the processor is coupled to the memory; The processor is used to execute the computer program stored in the memory so that the electronic device performs the method as described in the second aspect.

[0021] In a fourth aspect, the present application provides a computer-readable storage medium, comprising a computer program or instructions, which, when executed on a computer, causes the computer to execute the method described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a hybrid tractor thermal management system according to an embodiment of the present application; Figure 2 A schematic diagram showing the structure of the electric drive cooling circuit according to an embodiment of the present application; Figure 3 A schematic diagram showing the structure of a three-way valve according to an embodiment of the present application; Figure 4 A schematic diagram showing the heat circuit structure of an engine according to an embodiment of the present application; Figure 5 This is a schematic flow chart of a hybrid tractor thermal management method according to an embodiment of the present application; Figure 6 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Compressor; 2. Condenser; 3. First water pump; 4. Third three-way valve; 5. Battery pack; 6. Cooler; 7. First four-way valve; 8. Second water pump; 9. Third water pump; 10. Second four-way valve; 11. Engine; 12. Thermostat; 13. Generator; 14. Electric motor; 15. Radiator; 16. Pump motor hydraulic pump; 17. Hydraulic system; 18. First three-way valve; 19. Second three-way valve; 20. Heat exchanger; 21. Expansion kettle. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1As shown, an embodiment of the present application provides a hybrid tractor thermal management system, including a battery thermal management module and a tractor waste heat management module, the battery thermal management module includes a battery pack cooling circuit, a first battery pack heating circuit and a second battery pack heating circuit, the tractor waste heat management module includes an electric drive cooling circuit and an engine thermal circuit.

[0026] The hybrid tractor includes a battery pack 5, an electric drive device and an engine 11. When the hybrid tractor is started, the electric drive device and the engine 11 will generate heat. The battery thermal management module corresponds to the battery pack 5 and is used to adjust the current temperature of the battery pack 5. The electric drive cooling circuit corresponds to the electric drive device and is used to adjust the temperature of the electric drive device. The engine thermal circuit corresponds to the engine 11 and is used to adjust the temperature of the engine 11.

[0027] When the current temperature of the battery pack 5 is higher than the preset battery temperature range, the battery pack cooling circuit is turned on to cool the battery pack 5. When the current temperature of the battery pack 5 is lower than the battery temperature range and higher than the preset temperature limit, the electric drive cooling circuit is controlled to perform heat exchange with the first battery pack heating circuit.

[0028] When the current temperature of the battery pack 5 is lower than the temperature limit value, the engine thermal circuit is controlled to be connected to the second battery pack heating circuit so that the heated coolant in the engine thermal circuit heats the battery pack 5, and the temperature limit value is lower than the battery temperature range.

[0029] The battery pack 5 needs to work at a suitable temperature, and the battery temperature range can be preset to T1~T2, where T2 is greater than T1. When the current temperature of the battery pack 5 is higher than T2, that is, the current temperature is higher than the preset battery temperature range, the battery pack 5 needs to be cooled; when the current temperature of the battery pack 5 is lower than T1, that is, the current temperature is lower than the preset battery temperature range, the battery pack 5 needs to be heated.

[0030] The hybrid tractor thermal management system may include a heat exchanger 20, the heat exchanger 20 includes a plurality of exchanger channels, and the coolant between two adjacent exchanger channels can perform heat exchange. When the current temperature of the battery pack 5 is higher than T2, the battery pack cooling circuit may be turned on to cool the battery pack 5.

[0031] When the current temperature of the battery pack 5 is lower than T1 and higher than the temperature limit, the electric drive cooling circuit and the first battery pack heating circuit can be turned on. The electric drive cooling circuit and the first battery pack heating circuit respectively include different exchanger channels in the heat exchanger 20. The exchanger channel corresponding to the electric drive cooling circuit is adjacent to the exchanger channel corresponding to the first battery pack heating circuit, so that the cooling medium in the electric drive cooling circuit can exchange heat with the coolant in the first battery pack heating circuit in the heat exchanger 20. Since the cooling medium in the electric drive cooling circuit can absorb the heat generated during the operation of the electric drive device, the temperature of the cooling medium in the electric drive cooling circuit is higher than the temperature of the coolant in the first battery pack heating circuit. Therefore, after the coolant in the first battery pack heating circuit passes through the heat exchanger 20, the temperature of the coolant can be increased, so as to heat the battery pack 5, so that the temperature of the battery pack 5 can be kept within the battery temperature range, thereby improving the service life of the battery pack 5 and increasing the battery life of the battery pack 5.

[0032] The temperature limit value can be set according to the characteristics of the battery pack 5. In the present embodiment, since the battery pack 5 cannot be charged naturally when the temperature is below 0°C, when the vehicle is to be charged after being stopped for a period of time under low temperature conditions, the battery temperature must first be heated to above 0°C. Therefore, the temperature limit value can be 0°C.

[0033] When the current temperature of the battery pack 5 is lower than the preset temperature limit, the engine thermal circuit is directly connected to the second battery pack heating circuit, so that the coolant of the engine 11 in the engine thermal circuit can directly enter the second battery pack heating circuit of the battery pack 5 to heat the battery pack 5.

[0034] When the hybrid tractor is started, the heat generated by the engine 11 is higher than the heat generated by the electric drive device. Therefore, when the current temperature of the battery pack 5 is lower than the preset temperature limit, the heated coolant in the engine thermal circuit is directly introduced into the battery pack 5 for heating, thereby increasing the heating rate of the battery pack 5 and reducing the loss of waste heat.

[0035] In this embodiment, the heat exchanger 20 may include an exchanger A channel, an exchanger B channel, and an exchanger C channel. The exchanger A channel is adjacent to the exchanger B channel, and the exchanger B channel is adjacent to the exchanger C channel. Figure 1 In the figure, A at the heat exchanger 20 is the exchanger A channel, B is the exchanger B channel, and C is the exchanger C channel.

[0036] In this embodiment, the hybrid tractor thermal management system may include a radiator 15, and a cooling fan is provided at the radiator 15. When a certain circuit needs to be cooled or lowered, the cooling fan can be turned on, and the cooling fan can lower the temperature of the cooling medium passing through the radiator 15. The radiator 15 may include a plurality of radiator chambers, such as Figure 1 As shown, the heat sink 15 may include a first heat sink chamber, a second heat sink chamber, a third heat sink chamber, and a fourth heat sink chamber.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the battery pack cooling circuit includes a first radiator chamber, a cooler 6, a refrigerant circuit, a first water pump 3, a battery pack internal circuit and an exchanger B channel, the first radiator chamber, the refrigerant circuit and the first water pump 3 are respectively connected to the cooler 6, the first water pump 3 is connected to the battery pack internal circuit, and the battery pack internal circuit and the first radiator chamber are respectively connected to the exchanger B channel.

[0038] When the current temperature of the battery pack 5 is higher than the preset battery temperature range, the coolant transported out of the first radiator chamber is controlled to perform heat exchange with the refrigerant transported by the refrigerant circuit in the cooler 6, and the first water pump 3 is used to transport the coolant after heat exchange to the battery pack circuit, and the coolant after cooling the battery pack 5 re-enters the first radiator chamber through the exchanger B channel.

[0039] The refrigerant circuit includes a compressor 1 and a condenser 2. The compressor 1 is connected to the condenser 2, and the condenser 2 is connected to the chiller 6 (Chiller). The condenser 2 is used to transport the refrigerant to the chiller 6, and the refrigerant after heat exchange re-enters the compressor 1. The flow direction of the refrigerant in the chiller 6 is opposite to the flow direction of the coolant transported out of the first radiator chamber, thereby further cooling the coolant to achieve the purpose of cooling the battery pack 5 by the coolant.

[0040] When the current temperature of the battery pack 5 is higher than the preset battery temperature range, the cooling fan is turned on, and the coolant after cooling the battery pack 5 can re-enter the first radiator chamber through the exchanger B channel. The cooling fan can cool the coolant after absorbing the heat of the battery pack and control the battery pack cooling circuit to remain in the open state until the new current temperature of the battery pack 5 is no higher than the preset battery temperature range.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the electric drive device includes a motor 14 and a generator 13, the electric drive cooling circuit includes a motor cooling circuit, and the motor cooling circuit includes a second radiator chamber, a second water pump 8, a motor internal circuit, a generator internal circuit, a first three-way valve 18, and a channel of the exchanger A. The first battery pack heating circuit includes the first radiator chamber, the cooler 6, the first water pump 3, the battery pack internal circuit, and the exchanger B channel.

[0042] The second radiator chamber and the motor internal circuit are respectively connected to the second water pump 8, the motor internal circuit is also connected to the generator internal circuit, the first three-way valve 18 is connected to the generator internal circuit, the first three-way valve 18 includes a first passage and a second passage, the first passage is connected to the second radiator chamber, the second passage is connected to the exchanger A channel, and the exchanger A channel is connected to the second radiator chamber. Figure 2 and Figure 3 As shown, the first passage is the CB passage of the first three-way valve 18 , and the second passage is the CA passage of the first three-way valve 18 .

[0043] When the current temperature of the battery pack 5 is lower than the preset battery temperature range and higher than the temperature limit value, the first passage is controlled to be closed and the second passage is opened, and the second water pump 8 is used to transport the coolant transported from the second radiator chamber to the internal circuit of the motor and the internal circuit of the generator in sequence, and the coolant after cooling the motor 14 and the generator 13 enters the exchanger A channel through the second passage, and the coolant in the exchanger A channel performs heat exchange with the coolant in the exchanger B channel, and the coolant after heat exchange in the electric drive cooling circuit re-enters the second radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber.

[0044] Since the electric drive device generates heat when working, the temperature of the coolant in the exchanger A channel is higher than the temperature of the coolant in the exchanger B channel. The coolant in the exchanger A channel performs heat exchange with the coolant in the exchanger B channel to increase the temperature of the coolant in the exchanger B channel, so as to heat the battery pack 5 through the first battery pack heating circuit and increase the current working temperature of the battery pack 5. It is easy to understand that when the battery pack 5 needs to be heated, the cooling fan can be in a closed state.

[0045] When the current temperature of the battery pack 5 is not lower than a preset battery temperature range and the motor 14 needs to be cooled, the second passage is controlled to be closed and the first passage is opened, and the coolant after cooling the motor 14 and the generator 13 re-enters the second radiator chamber through the first passage.

[0046] In this embodiment, the motor 14 also needs to operate within a suitable temperature range. When the temperature of the motor 14 is higher than the preset temperature range, cooling treatment is required. At this time, the cooling fan can be turned on, and the coolant cooled by the second radiator chamber can be used to cool the motor 14, so that the motor 14 can operate within a suitable temperature range.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the electric drive device also includes a hydraulic system 17, the electric drive cooling circuit includes a hydraulic drive cooling circuit, and the hydraulic drive cooling circuit includes a fourth radiator chamber, a pump motor hydraulic pump 16, an internal circuit of the hydraulic system, a second three-way valve 19 and an exchanger C channel.

[0048] The fourth radiator chamber and the hydraulic system internal circuit are respectively connected to the pump motor hydraulic pump 16, the second three-way valve 19 is connected to the hydraulic system internal circuit, the second three-way valve 19 includes a third passage and a fourth passage, the third passage is connected to the fourth radiator chamber, the fourth passage is connected to the exchanger C channel, and the exchanger C channel is connected to the fourth radiator chamber. Figure 2 and Figure 3 As shown, the third passage is the CA passage of the second three-way valve 19 , and the fourth passage is the CB passage of the second three-way valve 19 .

[0049] When the current temperature of the battery pack 5 is lower than the preset battery temperature range and higher than the temperature limit value, the third passage is controlled to close and the fourth passage is opened, and the pump motor hydraulic pump 16 is used to transport the cooling oil transported from the fourth radiator chamber to the internal circuit of the hydraulic system, and the cooling oil after cooling the hydraulic system 17 enters the exchanger C channel through the fourth passage, and the cooling oil in the exchanger C channel performs heat exchange with the coolant in the exchanger B channel. The cooling oil after heat exchange in the hydraulic drive cooling circuit re-enters the fourth radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber.

[0050] Since the hydraulic system 17 generates heat when working, the temperature of the cooling oil in the exchanger C channel is higher than the temperature of the coolant in the exchanger B channel. The cooling oil in the exchanger C channel performs heat exchange with the coolant in the exchanger B channel to increase the temperature of the coolant in the exchanger B channel, so as to heat the battery pack 5 through the first battery pack heating circuit and increase the current working temperature of the battery pack 5. It is easy to understand that the cooling oil can be cooling hydraulic oil.

[0051] When the current temperature of the battery pack 5 is not lower than the preset battery temperature range and the hydraulic system 17 needs to be cooled, the fourth passage is controlled to be closed and the third passage is opened, and the cooling oil after cooling the hydraulic system 17 re-enters the fourth radiator chamber through the third passage.

[0052] In this embodiment, the hydraulic system 17 also needs to work within a suitable temperature range. When the temperature of the hydraulic system 17 is higher than the preset temperature range, cooling treatment is required. At this time, the cooling fan can be turned on, and the cooling oil cooled by the fourth radiator chamber can be used to cool the motor 14, so that the hydraulic system 17 can work within a suitable temperature range.

[0053] When the current temperature of the battery pack 5 is lower than the preset battery temperature range and higher than the temperature limit value, one of the motor cooling circuit and the hydraulic drive cooling circuit can be selected as the electric drive cooling circuit, or the circuit with the highest cooling medium temperature between the motor cooling circuit and the hydraulic drive cooling circuit can be selected as the electric drive cooling circuit.

[0054] It is easy to understand that when the current temperature of the battery pack 5 is higher than the preset battery temperature range, the coolant in the battery pack cooling circuit does not need to exchange heat with the cooling medium in the electric drive cooling circuit at the heat exchanger 20 .

[0055] like Figure 1 and Figure 4 As shown, in this embodiment, the second battery pack heating circuit includes a first four-way valve 7, a third three-way valve 4 and a third water pump 9, the first four-way valve 7 includes a fifth passage, the third three-way valve 4 includes a sixth passage and a seventh passage, the fifth passage is respectively connected to the internal circuit of the battery pack and the third water pump 9, the sixth passage is respectively connected to the internal circuit of the battery pack and the first water pump 3, when the current temperature of the battery pack 5 is lower than the preset battery temperature range and higher than the temperature limit value, the sixth passage is controlled to open and the seventh passage is closed. Figure 1 and Figure 4 As shown, the fifth passage is the BC passage of the first four-way valve 7 , the sixth passage is the AC passage of the third three-way valve 4 , and the seventh passage is the AB passage of the third three-way valve 4 .

[0056] The engine thermal circuit includes a second four-way valve 10, an engine internal circuit and a thermostat 12. The second four-way valve 10 includes an eighth passage and a ninth passage. The third water pump 9 is also connected to the eighth passage. The engine internal circuit is connected to the eighth passage and the thermostat 12 respectively. The thermostat 12 is connected to the ninth passage. The ninth passage is connected to the seventh passage. The eighth passage is the BD passage of the second four-way valve 10, and the ninth passage is the CA passage of the second four-way valve 10.

[0057] like Figure 1 and Figure 4As shown, when the current temperature of the battery pack 5 is lower than the temperature limit value, the seventh passage is controlled to open and the sixth passage is closed, and the coolant heated in the internal circuit of the engine passes through the thermostat 12, the ninth passage and the seventh passage, and is directly transported to the internal circuit of the battery pack. The coolant heated in the internal circuit of the battery pack re-enters the internal circuit of the engine through the fifth passage, the third water pump 9 and the eighth passage.

[0058] The first four-way valve 7 further includes a tenth passage, which is respectively connected to the third radiator chamber and the third water pump 9. The second four-way valve 10 further includes an eleventh passage, which is respectively connected to the thermostat 12 and the internal circuit of the engine. It is easy to understand that the thermostat 12 also includes a plurality of channels, and different channels are connected to different devices. The tenth passage is the AC passage of the first four-way valve 7, and the eleventh passage is the CD passage of the second four-way valve 10.

[0059] like Figure 1 and Figure 4 As shown, when the current temperature of the battery pack 5 is lower than the temperature limit value, the coolant in the engine thermal circuit needs to be heated first. During the heating process, the coolant in the third radiator chamber needs to be transported to the engine thermal circuit through the tenth passage through the third water pump 9. When the coolant is transported to the engine thermal circuit, the eighth passage of the second four-way valve 10 is opened, and the other passages of the second four-way valve 10 are closed, so that the coolant enters the internal circuit of the engine through the eighth passage, and the coolant absorbs the heat emitted by the engine 11, and then the coolant is transported to the thermostat 12. The thermostat 12 opens the passage connected to the second four-way valve 10, the eleventh passage of the second four-way valve 10 is opened, and the other passages of the second four-way valve 10 are closed, so that the coolant re-enters the internal circuit of the engine through the eleventh passage, so that the coolant circulates to absorb the heat emitted by the engine 11, and the temperature rise of the coolant is completed.

[0060] When the temperature of the coolant in the engine thermal circuit is higher than the current temperature of the battery pack 5 or the temperature of the coolant is higher than the preset temperature threshold, the temperature rising process of the coolant is completed, the eighth passage and the ninth passage of the second four-way valve 10 are opened, and the eleventh passage of the second four-way valve 10 is closed, so that the coolant after the temperature rising in the internal circuit of the engine passes through the ninth passage and the seventh passage and is directly transported to the internal circuit of the battery pack. The coolant after the temperature rising in the internal circuit of the battery pack re-enters the internal circuit of the engine through the fifth passage, the third water pump 9 and the eighth passage in sequence.

[0061] By integrating the circuits corresponding to the engine 11, the motor 14, and the hydraulic system 17 with the battery thermal management module, the waste heat of each branch is fully utilized, thereby improving the working efficiency of the entire vehicle.

[0062] When the hybrid tractor is started after being stopped for a period of time under low temperature conditions, the temperature of the engine 11 will be lower than the preset temperature range. In order to keep the engine 11 running within the appropriate temperature range, the engine 11 needs to be heated.

[0063] When the engine 11 needs to be heated, the coolant transported from the third radiator chamber enters the internal circuit of the engine through the tenth passage and the third water pump 9. After flowing out of the internal circuit of the engine, the coolant enters the eleventh passage through the thermostat 12, and the other passages of the second four-way valve 10 are closed to allow the coolant to re-enter the internal circuit of the engine through the eleventh passage.

[0064] When the engine 11 needs to be heated, the coolant in the third radiator chamber is pumped into the internal circuit of the engine by the third water pump 9 through the tenth passage. In the internal circuit of the engine, the coolant flows through various components that need to be cooled, and absorbs heat from components with higher temperatures such as the shaft sleeve, thereby increasing the temperature of the coolant itself. Subsequently, the coolant that has absorbed heat can heat other components of the engine 11 with lower temperatures.

[0065] By closing the other passages of the second four-way valve 10, it is ensured that the coolant can only re-enter the internal circuit of the engine along the eleventh passage, forming a closed-loop circulation, so that the coolant circulates continuously inside the engine 11, continuously absorbing and dispersing the heat of high-temperature components, and at the same time using this heat to heat up the engine 11 as a whole, reaching a more uniform and ideal operating temperature. When the engine 11 completes the overall heating, the thermostat 12 opens the passage connected to the third radiator chamber.

[0066] like Figure 1 and Figure 4 As shown, in this embodiment, the thermal management system also includes an engine cooling circuit, the engine cooling circuit includes a third radiator chamber, the tenth passage is connected to the third radiator chamber and the third water pump 9 respectively, and the thermostat 12 is also connected to the third radiator chamber.

[0067] When the current temperature of the battery pack 5 is not lower than the preset temperature limit value and the engine 11 needs to be cooled, the eighth passage and the tenth passage are controlled to be opened, and the fifth passage and the ninth passage are closed, and the coolant transported from the third radiator chamber enters the third water pump 9 through the tenth passage, and the third water pump 9 transports the coolant to the internal circuit of the engine through the tenth passage, and the coolant after cooling the engine 11 re-enters the third radiator chamber through the thermostat 12.

[0068] In this embodiment, the engine 11 also needs to operate within a suitable temperature range. When the temperature of the engine 11 is higher than the preset temperature range, cooling treatment is required. At this time, the cooling fan can be turned on, and the coolant cooled by the third radiator chamber can be used to cool the engine 11, so that the engine 11 can operate within a suitable temperature range.

[0069] like Figure 1 and Figure 4 As shown, in this embodiment, the first four-way valve 7 also includes a twelfth passage, which is arranged between the internal circuit of the battery pack and the channel of the converter B, and the twelfth passage is respectively connected to the internal circuit of the battery pack and the channel of the converter B. The twelfth passage is the BD passage of the first four-way valve 7.

[0070] When the current temperature of the battery pack 5 is higher than the preset battery temperature range, the twelfth passage is opened, so that the coolant after cooling the battery pack 5 enters the exchanger B channel through the twelfth passage, and then re-enters the first radiator chamber through the exchanger B channel.

[0071] like Figure 1 As shown, in this embodiment, an expansion kettle 21 is provided on the pipeline between the cooler 6 and the first radiator chamber. The expansion kettle 21 can be provided at the highest point of the battery pack cooling circuit, which helps to balance the pressure of the battery pack cooling circuit. When the pressure in the battery pack cooling circuit is too high, the excess gas or coolant can be discharged through the exhaust port or a specific channel of the expansion kettle 21, so as to prevent the battery pack cooling circuit from being damaged due to excessive pressure, thereby ensuring that the battery pack cooling circuit can operate stably under various working conditions. During the process of filling the coolant, the expansion kettle 21 also serves to discharge the residual air in the battery pack cooling circuit. Through appropriate exhaust design, such as setting an exhaust port or using a specific exhaust strategy, it can be ensured that the coolant smoothly fills the entire battery pack cooling circuit during the filling process and discharges the air therein, thereby improving the efficiency and reliability of the battery pack cooling circuit.

[0072] Based on the same technical concept, the embodiment of the present application provides a hybrid tractor thermal management method, which can be executed by a device, which can be a server or a terminal device, wherein the server can be an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services. The terminal device can be a smart phone, a tablet computer, a desktop computer, etc., but is not limited thereto.

[0073] like Figure 5 As shown, a hybrid tractor thermal management method is implemented by an electronic device, and the main process of the method is described as follows (steps S101 to S104): Step S101: obtaining the current temperature of the battery pack in real time; Step S102: if the current temperature of the battery pack is higher than a preset battery temperature range, the battery pack cooling circuit is turned on to cool the battery pack; Step S103: if the current temperature is lower than the battery temperature range and higher than a preset temperature limit, the electric drive cooling circuit and the first battery pack heating circuit are turned on to control the electric drive cooling circuit to perform heat exchange with the first battery pack heating circuit; Step S104: If the current temperature of the battery pack is lower than the temperature limit value, the engine thermal circuit and the second battery pack heating circuit are turned on, and the engine thermal circuit is controlled to be connected with the second battery pack heating circuit so that the heated coolant in the engine thermal circuit enters the second battery pack heating circuit, and the second battery pack heating circuit heats the battery pack. The temperature limit value is lower than the battery temperature range.

[0074] Optionally, step S102 includes: The first radiator chamber, the cooler, the refrigerant circuit, the first water pump, the internal circuit of the battery pack and the exchanger B channel are opened to control the coolant transported from the first radiator chamber to exchange heat with the refrigerant transported by the refrigerant circuit in the cooler, and the coolant after the heat exchange is transported to the battery pack circuit by the first water pump, and the coolant after cooling the battery pack re-enters the first radiator chamber through the exchanger B channel.

[0075] Optionally, step S103 includes: The first radiator chamber, the cooler, the first water pump, the internal circuit of the battery pack and the exchanger B channel are opened, so that the coolant transported from the first radiator chamber is controlled to exchange heat with the refrigerant transported by the refrigerant circuit in the cooler, and the coolant after the heat exchange is transported to the battery pack circuit through the first water pump, and the coolant after cooling the battery pack re-enters the first radiator chamber through the exchanger B channel; The second radiator chamber, the second passage, the second water pump, the internal circuit of the motor, the internal circuit of the generator and the exchanger A channel are opened, and the first passage is closed. The second water pump transports the coolant transported from the second radiator chamber to the internal circuit of the motor and the internal circuit of the generator in sequence. The coolant after cooling the motor and the generator enters the exchanger A channel through the second passage. The coolant in the exchanger A channel exchanges heat with the coolant in the exchanger B channel. The coolant after heat exchange in the electric drive cooling circuit re-enters the second radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber.

[0076] Optionally, after step S101, the method further includes: Obtain the temperature of the motor; if the current temperature of the battery pack is not lower than a preset battery temperature range, and the temperature of the motor exceeds the corresponding temperature range, close the second passage and open the first passage so that the coolant after cooling the motor and the generator re-enters the second radiator chamber through the first passage.

[0077] Optionally, step S103 includes: The first radiator chamber, the cooler, the first water pump, the internal circuit of the battery pack and the exchanger B channel are opened, so that the coolant transported from the first radiator chamber is controlled to exchange heat with the refrigerant transported by the refrigerant circuit in the cooler, and the coolant after the heat exchange is transported to the battery pack circuit through the first water pump, and the coolant after cooling the battery pack re-enters the first radiator chamber through the exchanger B channel; The fourth radiator chamber, the fourth passage, the pump motor hydraulic pump, the internal circuit of the hydraulic system and the exchanger C channel are opened, and the third passage is closed. The pump motor hydraulic pump transports the cooling oil transported from the fourth radiator chamber to the internal circuit of the hydraulic system. The cooling oil after cooling the hydraulic system enters the exchanger C channel through the fourth passage. The cooling oil in the exchanger C channel exchanges heat with the coolant in the exchanger B channel. The cooling oil after heat exchange in the hydraulic drive cooling circuit re-enters the fourth radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber.

[0078] Optionally, after step S101, the method further includes: Obtain the temperature of the hydraulic system; if the current temperature of the battery pack is not lower than a preset battery temperature range, and the temperature of the hydraulic system exceeds the corresponding temperature range, open the third passage and close the fourth passage, so that the cooling oil after cooling the hydraulic system re-enters the fourth radiator chamber through the third passage.

[0079] Optionally, step S104 includes: The third water pump, the fifth passage, the seventh passage, the internal circuit of the engine, the thermostat, the eighth passage, the ninth passage and the internal circuit of the battery pack are opened, and the sixth passage is closed, so that the coolant heated in the internal circuit of the engine passes through the thermostat, the ninth passage and the seventh passage, and is directly transported to the internal circuit of the battery pack, and the coolant heated in the internal circuit of the battery pack re-enters the internal circuit of the engine through the fifth passage, the third water pump and the eighth passage.

[0080] Optionally, after step S101, the method further includes: Obtain the temperature of the engine; if the current temperature of the battery pack is not lower than a preset battery temperature range, and the temperature of the engine exceeds the corresponding temperature range, open the third radiator chamber, the eighth passage, the tenth passage, the third water pump, the internal circuit of the engine and the thermostat, and close the fifth passage and the ninth passage. The coolant transported from the third radiator chamber enters the third water pump through the tenth passage, and the coolant is transported to the internal circuit of the engine through the tenth passage by the third water pump. The coolant after cooling the engine re-enters the third radiator chamber through the thermostat.

[0081] Optionally, after obtaining the engine temperature, the following is further included: If the temperature of the engine is lower than the corresponding temperature range, the third radiator chamber, the tenth passage, the third water pump, the internal circuit of the engine, the thermostat, and the eleventh passage are opened to allow the transported coolant to enter the internal circuit of the engine through the tenth passage and the third water pump, and after the coolant flows out of the internal circuit of the engine, it enters the eleventh passage through the thermostat, and the other passages of the second four-way valve are closed to allow the coolant to re-enter the internal circuit of the engine through the eleventh passage.

[0082] Based on the same technical concept, the present application also provides an electronic device, such as Figure 6 As shown, the electronic device 300 includes a processor 301 and a memory 302 , and may further include an information input / information output (I / O) interface 303 , one or more of a communication component 304 , and a communication bus 305 .

[0083] The processor 301 is used to control the overall operation of the electronic device 300 to complete all or part of the steps in the above hybrid tractor thermal management method; the memory 302 is used to store various types of data to support the operation of the electronic device 300, and these data may include, for example, instructions for any application or method operated on the electronic device 300, and data related to the application. The memory 302 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0084] The I / O interface 303 provides an interface between the processor 301 and other interface modules, and the above-mentioned other interface modules can be keyboards, mice, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 304 is used to test the wired or wireless communication between the electronic device 300 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 304 can include: Wi-Fi components, Bluetooth components, NFC components.

[0085] The communication bus 305 may include a path to transmit information between the above components. The communication bus 305 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The communication bus 305 may be divided into an address bus, a data bus, a control bus, etc.

[0086] The electronic device 300 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the hybrid tractor thermal management method given in the above embodiment.

[0087] The electronic device 300 may include, but is not limited to, a mobile terminal such as a digital broadcast receiver, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), etc., and a fixed terminal such as a digital TV, a desktop computer, etc., and may also be a server, etc.

[0088] Based on the same technical concept, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned hybrid tractor thermal management method are implemented.

[0089] The computer-readable storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0090] The terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hybrid tractor thermal management system, characterized in that: It includes a battery thermal management module and a tractor waste heat management module, wherein the battery thermal management module includes a battery pack cooling circuit, a first battery pack heating circuit and a second battery pack heating circuit, and the tractor waste heat management module includes an electric drive cooling circuit and an engine heat circuit; When the current temperature of the battery pack is higher than a preset battery temperature range, turning on the battery pack cooling circuit to cool the battery pack; When the current temperature of the battery pack is lower than the battery temperature range and higher than a preset temperature limit value, controlling the electric drive cooling circuit to perform heat exchange with the first battery pack heating circuit; When the current temperature of the battery pack is lower than the temperature limit value, the engine thermal circuit is controlled to be connected to the second battery pack heating circuit so that the heated coolant in the engine thermal circuit enters the second battery pack heating circuit, and the second battery pack heating circuit heats the battery pack, and the temperature limit value is lower than the battery temperature range.

2. A hybrid tractor thermal management system according to claim 1, characterized in that: The battery pack cooling circuit includes a first radiator chamber, a cooler, a refrigerant circuit, a first water pump, a battery pack internal circuit and an exchanger B channel, wherein the first radiator chamber, the refrigerant circuit and the first water pump are respectively connected to the cooler, the first water pump is connected to the battery pack internal circuit, and the battery pack internal circuit and the first radiator chamber are respectively connected to the exchanger B channel; When the current temperature of the battery pack is higher than the preset battery temperature range, the coolant transported out of the first radiator chamber is controlled to perform heat exchange with the refrigerant transported in the refrigerant circuit in the cooler, and the coolant after heat exchange is transported to the battery pack circuit through the first water pump, and the coolant after cooling the battery pack re-enters the first radiator chamber through the exchanger B channel.

3. A hybrid tractor thermal management system according to claim 2, characterized in that: The electric drive cooling circuit includes a motor cooling circuit, the motor cooling circuit includes a second radiator chamber, a second water pump, a motor internal circuit, a generator internal circuit, a first three-way valve and an exchanger A channel; The first battery pack heating circuit includes the first radiator chamber, the cooler, the first water pump, the battery pack internal circuit and the exchanger B channel; The second radiator chamber and the internal circuit of the motor are respectively communicated with the second water pump, the internal circuit of the motor is also communicated with the internal circuit of the generator, the first three-way valve is communicated with the internal circuit of the generator, the first three-way valve includes a first passage and a second passage, the first passage is communicated with the second radiator chamber, the second passage is communicated with the exchanger A channel, and the exchanger A channel is communicated with the second radiator chamber; When the current temperature of the battery pack is lower than the preset battery temperature range and higher than the temperature limit value, the first passage is controlled to be closed and the second passage is opened, and the coolant transported from the second radiator chamber is transported to the internal circuit of the motor and the internal circuit of the generator in sequence by the second water pump, and the coolant after cooling the motor and the generator enters the exchanger A channel through the second passage, and the coolant in the exchanger A channel performs heat exchange with the coolant in the exchanger B channel, and the coolant after heat exchange in the electric drive cooling circuit re-enters the second radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber; When the current temperature of the battery pack is not lower than a preset battery temperature range and the motor needs to be cooled, the second passage is controlled to be closed and the first passage is opened, and the coolant after cooling the motor and the generator re-enters the second radiator chamber through the first passage.

4. A hybrid tractor thermal management system according to claim 2, characterized in that: The electric drive cooling circuit includes a hydraulic drive cooling circuit, the hydraulic drive cooling circuit includes a fourth radiator chamber, a pump motor hydraulic pump, a hydraulic system internal circuit, a second three-way valve and an exchanger C channel; The first battery pack heating circuit includes the first radiator chamber, the cooler, the first water pump, the battery pack internal circuit and the exchanger B channel; The fourth radiator chamber and the hydraulic system internal circuit are respectively communicated with the pump motor hydraulic pump, the second three-way valve is communicated with the hydraulic system internal circuit, the second three-way valve includes a third passage and a fourth passage, the third passage is communicated with the fourth radiator chamber, the fourth passage is communicated with the exchanger C channel, and the exchanger C channel is communicated with the fourth radiator chamber; When the current temperature of the battery pack is lower than a preset battery temperature range and higher than a preset temperature limit value, the third passage is controlled to be closed and the fourth passage is opened, and the cooling oil transported from the fourth radiator chamber is transported to the internal circuit of the hydraulic system through the pump motor hydraulic pump, and the cooling oil after the hydraulic system is cooled enters the exchanger C channel through the fourth passage, and the cooling oil in the exchanger C channel performs heat exchange with the coolant in the exchanger B channel, and the cooling oil after heat exchange in the hydraulic drive cooling circuit re-enters the fourth radiator chamber, and the coolant after heat exchange in the first battery pack heating circuit re-enters the first radiator chamber; When the current temperature of the battery pack is not lower than a preset battery temperature range and the hydraulic system needs to be cooled, the fourth passage is controlled to be closed and the third passage is opened, so that the cooling oil after cooling the hydraulic system re-enters the fourth radiator chamber through the third passage.

5. A hybrid tractor thermal management system according to claim 3 or 4, characterized in that: The second battery pack heating circuit includes a first four-way valve, a third three-way valve and a third water pump, the first four-way valve includes a fifth passage, the third three-way valve includes a sixth passage and a seventh passage, the fifth passage is respectively connected to the battery pack internal circuit and the third water pump, and the sixth passage is respectively connected to the battery pack internal circuit and the first water pump; When the current temperature of the battery pack is lower than a preset battery temperature range and higher than the temperature limit value, controlling the sixth path to be opened and closing the seventh path; The engine thermal circuit includes a second four-way valve, an engine internal circuit and a thermostat, the second four-way valve includes an eighth passage and a ninth passage, the third water pump is also connected to the eighth passage, the engine internal circuit is connected to the eighth passage and the thermostat respectively, the thermostat is connected to the ninth passage, and the ninth passage is connected to the seventh passage; When the current temperature of the battery pack is lower than the temperature limit value, the seventh passage is controlled to open and the sixth passage is closed, and the coolant heated in the internal circuit of the engine passes through the thermostat, the ninth passage and the seventh passage, and is directly transported to the internal circuit of the battery pack. The coolant heated in the internal circuit of the battery pack re-enters the internal circuit of the engine through the fifth passage, the third water pump and the eighth passage.

6. A hybrid tractor thermal management system according to claim 5, characterized in that: The first four-way valve further includes a tenth passage, the thermal management system further includes an engine cooling circuit, the engine cooling circuit includes a third radiator chamber, the tenth passage is respectively connected to the third radiator chamber and the third water pump, and the thermostat is also connected to the third radiator chamber; When the current temperature of the battery pack is not lower than a preset temperature limit value and the engine needs to be cooled, the eighth passage and the tenth passage are controlled to be opened, and the fifth passage and the ninth passage are closed, the coolant transported from the third radiator chamber enters the third water pump through the tenth passage, and the coolant is transported to the internal circuit of the engine through the tenth passage by the third water pump, and the coolant after cooling the engine re-enters the third radiator chamber through the thermostat.

7. A hybrid tractor thermal management system according to claim 6, characterized in that: The second four-way valve further includes an eleventh passage, the eleventh passage being in communication with the thermostat and the internal circuit of the engine respectively; When the engine needs to be heated, the coolant transported from the third radiator chamber is controlled to enter the internal circuit of the engine through the tenth passage and the third water pump. After flowing out of the internal circuit of the engine, the coolant enters the eleventh passage through the thermostat, and the other passages of the second four-way valve are closed to allow the coolant to re-enter the internal circuit of the engine through the eleventh passage.

8. A hybrid tractor thermal management method, characterized in that: include: Get the current temperature of the battery pack in real time; If the current temperature of the battery pack is higher than a preset battery temperature range, the battery pack cooling circuit is turned on to cool the battery pack; If the current temperature is lower than the battery temperature range and higher than a preset temperature limit, the electric drive cooling circuit and the first battery pack heating circuit are turned on to control the electric drive cooling circuit to perform heat exchange with the first battery pack heating circuit; If the current temperature of the battery pack is lower than the temperature limit value, the engine thermal circuit and the second battery pack heating circuit are turned on, and the engine thermal circuit is controlled to be connected with the second battery pack heating circuit so that the heated coolant in the engine thermal circuit enters the second battery pack heating circuit, and the second battery pack heating circuit heats the battery pack. The temperature limit value is lower than the battery temperature range.

9. An electronic device, characterized in that: comprising a processor and a memory, wherein the processor is coupled to the memory; The processor is configured to execute the computer program stored in the memory, so that the electronic device performs the method according to claim 8.

10. A computer-readable storage medium, characterized in that: The method comprises a computer program or an instruction, which, when being executed on a computer, causes the computer to execute the method as claimed in claim 8.

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