Thermal management system, agricultural machinery, control method and storage medium

Abstract

The present invention relates to a thermal management system, agricultural machinery, a control method and a storage medium, wherein a thermal management system comprises a motor circuit assembly, a four-way valve whose third port is connected to the outlet of the motor circuit assembly, a PTC heater whose inlet is connected to the second port of the four-way valve of the four-way valve, a power battery whose inlet is connected to the outlet of the PTC heater, and a three-way valve whose second port is connected to the outlet of the power battery, wherein the first port of the three-way valve of the three-way valve is connected to the first port of the four-way valve of the four-way valve, and the fourth port of the four-way valve of the four-way valve is also connected to the inlet of the motor circuit assembly, and the outlet of the power battery is also connected to a battery radiator, and the outlet of the battery radiator is connected to the third port of the three-way valve of the three-way valve. The present invention can improve the technical problems that the motor waste heat of the existing electric agricultural machinery is wasted, and the battery pack is heated only by the PTC heater, resulting in high energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tractors, and in particular to a thermal management system, agricultural machinery, a control method and a storage medium. Background Art

[0002] Electric tractors are becoming more and more popular in the agricultural sector due to their low carbon emissions, low noise, and fuel savings. As an indispensable component, battery life and lifespan are issues that users focus on. At present, the motors, battery systems, and air conditioning systems of most electric tractors work independently of each other, resulting in waste of motor heat, and the battery pack is only heated by a PTC heater, which consumes a lot of energy, resulting in a certain loss in the work efficiency of the entire machine. Summary of the invention

[0003] The present invention aims to solve the technical problems that the waste heat of the motor of the existing electric agricultural machinery is wasted and the battery pack is heated only by a PTC heater, resulting in high energy consumption, and provides a thermal management system, agricultural machinery, a control method and a storage medium.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] In a first aspect, the present invention provides a thermal management system, comprising a motor circuit assembly, a four-way valve whose third port is connected to the outlet of the motor circuit assembly, a PTC heater whose inlet is connected to the second port of the four-way valve of the four-way valve, a power battery whose inlet is connected to the outlet of the PTC heater, and a three-way valve whose second port is connected to the outlet of the power battery, wherein the first port of the three-way valve is connected to the first port of the four-way valve of the four-way valve, and the fourth port of the four-way valve is also connected to the inlet of the motor circuit assembly, the outlet of the power battery is also connected to a battery radiator, and the outlet of the battery radiator is connected to the third port of the three-way valve of the three-way valve;

[0006] Wherein, when the real-time temperature value of the power battery is greater than the preset temperature value b, the three-way valve is switched to connect the third port of the three-way valve with the first port of the three-way valve, and the four-way valve is switched to connect the first port of the four-way valve with the second port of the four-way valve, and the PTC heater remains closed;

[0007] When the real-time temperature value of the power battery is between -30°C and the preset temperature value c, the four-way valve maintains the connection between the third port of the four-way valve and the second port of the four-way valve, the three-way valve is switched to the connection between the second port of the three-way valve and the first port of the three-way valve, and then the four-way valve is switched to the connection between the first port of the four-way valve and the fourth port of the four-way valve, and the PTC heater remains on;

[0008] The preset temperature value b is greater than the preset temperature value c.

[0009] The beneficial effects of the present invention are as follows: on the one hand, when the real-time temperature value of the power battery is between -30°C and the preset temperature value c, the PTC heater can be used for heating, and at the same time, the corresponding ports of the four-way valve and the three-way valve are opened, so that the coolant coming out of the motor in the motor circuit assembly passes through the four-way valve and the PTC heater in sequence and heats the power battery at the same time, and then the coolant returns to the motor circuit assembly through the three-way valve and the four-way valve. Such a cycle of heating the battery can effectively reduce the energy consumption of the PTC heater, improve the efficiency of the whole vehicle, and extend the service life of the battery; on the other hand, when the real-time temperature value of the power battery is greater than the preset temperature value b, the coolant coming out of the power battery passes through the battery radiator, the three-way valve, the four-way valve and the PTC heater in the closed state in sequence and returns to the power battery for circulation cooling, so that when the temperature of the power battery is relatively low, circulation cooling can be achieved through the battery radiator.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Further, a cooler is provided on the line between the first port of the three-way valve of the three-way valve and the first port of the four-way valve of the four-way valve, the outlet of the cooler is connected to a compressor, the outlet of the compressor is connected to a condenser, and the outlet of the condenser is connected to the inlet of the cooler;

[0012] Wherein, when the real-time temperature value of the power battery is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the three-way valve maintains the third port of the three-way valve and the first port of the three-way valve in communication, and the four-way valve maintains the first port of the four-way valve and the second port of the four-way valve in communication, and the PTC heater remains in a closed state;

[0013] When the real-time temperature value of the power battery is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve maintains the third port of the three-way valve in communication with the first port of the three-way valve, and the four-way valve maintains the first port of the four-way valve in communication with the second port of the four-way valve, and the PTC heater remains closed;

[0014] The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b, and the ambient temperature value is 20±5°C.

[0015] The beneficial effect of adopting the above further scheme is: when the real-time temperature value of the power battery is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the battery radiator cannot meet the heat dissipation demand of the power battery, and the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor to become a high-temperature and high-pressure gaseous refrigerant, which passes through the condenser to become a medium-pressure refrigerant, and then reaches the cooler to absorb the heat of the power battery and become a gaseous refrigerant and returns to the compressor, so as to realize the exchange-type circulating cooling operation through the battery radiator, thereby completing further cooling of the power battery.

[0016] Further, when the real-time temperature value of the power battery is greater than the preset temperature value c and less than the preset temperature value b, the four-way valve maintains the connection between the third port of the four-way valve and the second port of the four-way valve, and the three-way valve maintains the connection between the second port of the three-way valve and the first port of the three-way valve, and then controls the four-way valve to switch to the connection between the first port of the four-way valve and the fourth port of the four-way valve, and controls the PTC heater to be turned off.

[0017] The beneficial effect of adopting the above further scheme is that when the power battery is between the preset temperature value c and the preset temperature value b, the PTC heater is turned off, and only the residual heat of the motor in the motor circuit assembly is needed to heat the battery pack, thereby reducing energy consumption.

[0018] Further, when the real-time temperature value of the power battery is equal to the preset temperature value a, the three-way valve maintains the third port of the three-way valve in communication with the first port of the three-way valve, and the four-way valve maintains the first port of the four-way valve in communication with the second port of the four-way valve, and the PTC heater remains closed;

[0019] When the real-time temperature value of the power battery is equal to the preset temperature value b, the four-way valve maintains the third port of the four-way valve in communication with the second port of the four-way valve, the three-way valve maintains the second port of the three-way valve in communication with the first port of the three-way valve, and then the four-way valve switches to the first port of the four-way valve in communication with the fourth port of the four-way valve, and controls the PTC heater to be turned off;

[0020] When the real-time temperature value of the power battery is equal to the preset temperature value c, the four-way valve maintains the connection between the third port of the four-way valve and the second port of the four-way valve, the three-way valve is switched to the connection between the second port of the three-way valve and the first port of the three-way valve, and then the four-way valve is switched to the connection between the first port of the four-way valve and the fourth port of the four-way valve, and the PTC heater remains on.

[0021] The beneficial effect of adopting the above further scheme is: when the real-time temperature value of the power battery is equal to the preset temperature value a, the preset temperature value b or the preset temperature value c, the steps corresponding to the previous stage value of the preset temperature value are executed to heat or cool the power battery.

[0022] Furthermore, a first expansion valve is provided on the line connecting the condenser to the cold exchanger.

[0023] The beneficial effect of adopting the above further solution is that the medium-pressure refrigerant output through the condenser is converted into a low-temperature and low-pressure refrigerant through the first expansion valve.

[0024] Furthermore, the outlet of the condenser is connected to a second expansion valve, the outlet of the second expansion valve is connected to an evaporator installed in the cockpit, and the outlet of the evaporator is connected to the compressor.

[0025] The beneficial effect of adopting the above further scheme is that the low-temperature and low-pressure gaseous refrigerant becomes a low-temperature and low-pressure liquid refrigerant after passing through the compressor, the condenser and the second expansion valve, enters the evaporator to absorb the heat in the cockpit and becomes a gaseous refrigerant and returns to the compressor to achieve cooling of the cockpit. The refrigeration circuit and the power battery share a compressor, which increases the economy of the vehicle layout.

[0026] Furthermore, the thermal management system also includes a heater core installed in the cockpit, and the heater core is externally connected to a power source.

[0027] The beneficial effect of adopting the above further solution is: heating the cockpit through the heater core.

[0028] Furthermore, a battery water pump is provided on the pipeline connecting the cooler and the four-way valve.

[0029] The beneficial effect of adopting the above further solution is that the coolant discharged from the cooler is pumped to the four-way valve.

[0030] Furthermore, the motor circuit assembly includes a plurality of motors and a plurality of water pumps respectively configured for the plurality of motors, each of the motors is simultaneously connected to a second water collector, the outlet of the second water collector is connected to the third port of the four-way valve of the four-way valve, and the inlet of each of the water pumps is simultaneously connected to a first water collector, the inlet of the first water collector is connected to the fourth port of the four-way valve of the four-way valve.

[0031] The beneficial effect of adopting the above further solution is that the coolant configured for each motor is simultaneously directed to the four-way valve through the second water collector for unified processing.

[0032] Furthermore, the outlet of the second water collector is connected to a motor radiator, and the outlet of the motor radiator is connected to the inlet of the first water collector.

[0033] The beneficial effect of adopting the above further solution is: the heat dissipation operation of the motor in the motor circuit assembly is achieved through the motor heat sink.

[0034] Furthermore, the outlet of the second water collector is provided with a solenoid valve.

[0035] The beneficial effect of adopting the above further solution is: the opening and closing control of the pipeline is achieved through the solenoid valve.

[0036] In a second aspect, the present invention provides an agricultural machine, comprising the above-mentioned thermal management system.

[0037] In a third aspect, the present invention provides a control method for a thermal management system, which is applied to the thermal management system, and the control method comprises:

[0038] Detect the real-time temperature value of the power battery;

[0039] Determine the relationship between the real-time temperature value and the preset temperature value b, and determine the relationship between the real-time temperature value and the temperature value -30°C and the preset temperature value c, the preset temperature value b is greater than the preset temperature value c;

[0040] When the real-time temperature value of the power battery is greater than the preset temperature value b, the three-way valve is controlled to switch to a state where the third port of the three-way valve is connected to the first port of the three-way valve, and the four-way valve is controlled to switch to a state where the first port of the four-way valve is connected to the second port of the four-way valve, and the PTC heater remains in an off state;

[0041] When the real-time temperature value of the power battery is between -30°C and the preset temperature value c, the four-way valve is controlled to maintain the connection between the third port of the four-way valve and the second port of the four-way valve, the three-way valve is controlled to switch to the connection between the second port of the three-way valve and the first port of the three-way valve, and then the four-way valve is controlled to switch to the connection between the first port of the four-way valve and the fourth port of the four-way valve, and the PTC heater is controlled to remain in the on state.

[0042] The beneficial effects of the present invention are as follows: by arranging a four-way valve in the thermal management system, the battery can be quickly heated up by utilizing the residual heat of the motor at low temperatures or the battery can be operated within a suitable temperature range, thereby reducing the energy consumption of the PTC heater, improving the efficiency of the entire vehicle, and extending the service life of the battery; on the other hand, in order to reduce the energy consumption of battery heat dissipation, convection heat dissipation can be performed through the battery radiator when the battery temperature is not high.

[0043] Furthermore, the control method further includes:

[0044] Detect the real-time ambient temperature value, which is 20±5℃;

[0045] Determine the relationship between the real-time temperature value of the power battery, the preset temperature value a and the ambient temperature value, and the preset temperature value a is greater than the preset temperature value b;

[0046] When the real-time temperature value of the power battery is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the three-way valve is controlled to maintain the third port of the three-way valve and the first port of the three-way valve in communication, and the four-way valve is controlled to maintain the first port of the four-way valve and the second port of the four-way valve in communication, and the PTC heater is controlled to remain in a closed state;

[0047] When the real-time temperature value of the power battery is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve is controlled to maintain the third port of the three-way valve and the first port of the three-way valve in communication, the four-way valve is controlled to maintain the first port of the four-way valve and the second port of the four-way valve in communication, and the PTC heater is controlled to remain closed;

[0048] The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b.

[0049] The beneficial effect of adopting the above further solution is: when the battery operating temperature is high, a cooling method of heat exchange between the compressor compressing the refrigerant and the battery coolant is selected to reduce energy consumption.

[0050] Furthermore, the control method further includes:

[0051] Determine the relationship between the real-time temperature value of the power battery and the preset temperature value b and the preset temperature value c;

[0052] When the real-time temperature value of the power battery is greater than the preset temperature value c and less than the preset temperature value b, the four-way valve is controlled to maintain the third port of the four-way valve and the second port of the four-way valve connected, the three-way valve is controlled to maintain the second port of the three-way valve and the first port of the three-way valve connected, and then the four-way valve is controlled to switch to the first port of the four-way valve and the fourth port of the four-way valve connected, and the PTC heater is controlled to remain in a closed state.

[0053] The beneficial effect of adopting the above further scheme is that when the real-time temperature value of the power battery is between the preset temperature value b and the preset temperature value c, the power battery only needs to be heated by the waste heat of the motor, and the PTC heater is turned off, which can reduce energy consumption.

[0054] Further, the second expansion valve is controlled to open and communicate with the condenser, and the evaporator is controlled to open.

[0055] The beneficial effect of adopting the above further scheme is that the low-temperature and low-pressure gaseous refrigerant is converted into a low-temperature and low-pressure liquid refrigerant, which can absorb the heat of the cockpit after entering the evaporator. That is, the cockpit air conditioning and the power battery cooling circuit share a compressor, which increases the economy of the vehicle layout.

[0056] In a fourth aspect, the present invention provides a non-volatile readable storage medium having a computer program stored thereon, wherein the computer program implements the control method of the thermal management system when executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 is a structural diagram of the thermal management system of the present invention;

[0058] Figure 2 for Figure 1 A magnified view of the left local structure;

[0059] Figure 3 for Figure 1 An enlarged view of the local structure on the right.

[0060] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0061] 1. Battery radiator; 2. Evaporator; 3. Second expansion valve; 4. Warm air core; 5. First expansion valve; 6. Three-way valve; 61. First port of three-way valve; 62. Second port of three-way valve; 63. Third port of three-way valve; 7. Power battery; 8. Solenoid valve; 9. Second water collector; 10. Motor; 11. Water pump; 12. First water collector; 13. PTC heater; 14. Four-way valve; 141. First port of four-way valve; 142. Second port of four-way valve; 143. Third port of four-way valve; 144. Fourth port of four-way valve; 15. Battery water pump; 16. Cooling device; 17. Compressor; 18. Condenser; 19. Motor radiator. DETAILED DESCRIPTION

[0062] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0063] In a first aspect, the present invention provides a thermal management system, as described in detail below.

[0064] Example 1

[0065] like Figures 1 to 3 , a thermal management system, comprising a motor circuit assembly, a four-way valve 14 whose third port 143 of a four-way valve is connected to the outlet of the motor circuit assembly, a PTC heater 13 whose inlet is connected to the second port 142 of the four-way valve of the four-way valve 14, a power battery 7 whose inlet is connected to the outlet of the PTC heater 13, and a three-way valve 6 whose second port 62 of a three-way valve is connected to the outlet of the power battery 7, a three-way valve first port 61 of the three-way valve 6 is connected to the four-way valve first port 141 of the four-way valve 14, and a four-way valve fourth port 144 of the four-way valve 14 is also connected to the inlet of the motor circuit assembly, a battery radiator 1 is also connected to the outlet of the power battery 7, and the outlet of the battery radiator 1 is connected to the three-way valve third port 63 of the three-way valve 6;

[0066] When the real-time temperature value of the power battery 7 is greater than the preset temperature value b, the three-way valve 6 is switched to the third port 63 of the three-way valve being connected to the first port 61 of the three-way valve, and the four-way valve 14 is switched to the first port 141 of the four-way valve being connected to the second port 142 of the four-way valve, and the PTC heater 13 remains closed;

[0067] When the real-time temperature value of the power battery 7 is between -30°C and the preset temperature value c, the four-way valve 14 maintains the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, the three-way valve 6 is switched to the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve, and then the four-way valve 14 is switched to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and the PTC heater 13 remains on;

[0068] The preset temperature value b is greater than the preset temperature value c.

[0069] The beneficial effects of this embodiment are as follows: on the one hand, when the real-time temperature value of the power battery 7 is between -30°C and the preset temperature value c, the PTC heater 13 can be used for heating while opening the corresponding ports of the four-way valve 14 and the three-way valve 6, so that the coolant coming out of the motor in the motor circuit assembly passes through the four-way valve 14 and the PTC heater 13 in sequence and heats the power battery 7 at the same time, and then the coolant passes through the three-way valve 6 and the four-way valve 14 and returns to the motor circuit assembly. Such a cycle of heating the battery can effectively reduce the energy consumption of the PTC heater 13, improve the efficiency of the whole vehicle, and extend the service life of the battery; on the other hand, when the real-time temperature value of the power battery 7 is greater than the preset temperature value b, the coolant coming out of the power battery 7 passes through the battery radiator 1, the three-way valve 6, the four-way valve 14 and the PTC heater 13 in the closed state in sequence and returns to the power battery 7 for circulation cooling, so that when the temperature of the power battery is relatively low (lower than the preset temperature value a), circulation cooling is achieved through the battery radiator 1.

[0070] Based on the above embodiment, temperature sensors are provided at the inlet end of the third port 143 of the four-way valve, and at the inlet end and the outlet end of the power battery 7 to detect the temperature of the coolant transported by the pipeline at the corresponding position.

[0071] The battery radiator 1 is equipped with a fan to improve the heat dissipation efficiency of the battery radiator 1 through the fan.

[0072] The preset temperature value b can be set to 10-15° C., excluding any value within 15° C., and the preset temperature value c can be set to any value within 0-5° C. When the temperature of the power battery 7 is lower than −30° C., the power battery 7 does not work.

[0073] The power battery 7 is equipped with a temperature sensor to collect the temperature of the power battery 7 in real time, and the collected temperature is reported to the VCU (vehicle control unit) through the CAN network by the BMS (battery management system), and then sent to the TMS (thermal management controller), and then the TMS performs temperature comparison. As a parallel solution, the temperature information can be sent directly from the BMS to the TMS.

[0074] Example 2

[0075] like Figures 1 to 3 On the basis of Example 1, a cooler 16 is provided on the line between the three-way valve first port 61 of the three-way valve 6 and the four-way valve first port 141 of the four-way valve 14, the outlet of the cooler 16 is connected to a compressor 17, the outlet of the compressor 17 is connected to a condenser 18, and the outlet of the condenser 18 is connected to the inlet of the cooler 16;

[0076] When the real-time temperature value of the power battery 7 is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the three-way valve 6 maintains the connection between the third port 63 of the three-way valve and the first port 61 of the three-way valve, and the four-way valve 14 maintains the connection between the first port 141 of the four-way valve and the second port 142 of the four-way valve, and the PTC heater 13 remains in the closed state;

[0077] When the real-time temperature value of the power battery 7 is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve 6 maintains the communication between the third port 63 of the three-way valve and the first port 61 of the three-way valve, and the four-way valve 14 maintains the communication between the first port 141 of the four-way valve and the second port 142 of the four-way valve, and the PTC heater 13 remains closed;

[0078] The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b, and the ambient temperature value is 20±5° C. The preset temperature value a can be set to 25-30° C., and does not include any value within 25° C.

[0079] The beneficial effect of adopting the preferred scheme in the above embodiment is that when the real-time temperature value of the power battery 7 is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the battery radiator 1 cannot meet the heat dissipation demand of the power battery 7, and the low-temperature and low-pressure gaseous refrigerant is compressed by the compressor 17 to become a high-temperature and high-pressure gaseous refrigerant, which passes through the condenser 18 to become a medium-pressure refrigerant, and then reaches the cold exchanger 16 to absorb the heat of the power battery 7 and become a gaseous refrigerant and returns to the compressor 17, so as to realize the exchange-type circulating cooling operation through the battery radiator 1, thereby completing further cooling of the power battery 7.

[0080] In the present application, for the heat dissipation of the power battery 7, when the temperature of the power battery 7 is relatively low, that is, when the real-time temperature value is greater than the preset temperature value b, and less than the preset temperature value a, the heat dissipation can be performed only through the battery radiator 1; when the real-time temperature value of the power battery 7 is greater than the preset temperature value a, and when the real-time temperature value is greater than the ambient temperature value, the battery radiator 1 performs convection heat dissipation and the compressor 17 compresses the refrigerant and exchanges heat with the coolant of the power battery 7 to achieve circulating heat dissipation. Compared with the prior art method of only compressing the refrigerant for heat dissipation when the real-time temperature value of the power battery 7 is greater than the preset temperature value b or the preset temperature value a, the present application can select the battery radiator 1 for convection heat dissipation when the temperature of the power battery 7 is relatively low (greater than the preset temperature value b, and less than the preset temperature value a) and needs to be cooled, so as to reduce the energy consumption of the whole machine.

[0081] It should be noted that when the real-time temperature value of the power battery 7 is less than the preset temperature value a, the solution in which the real-time temperature value of the power battery 7 is greater than the preset temperature value b is implemented, that is, the coolant coming out of the power battery 7 passes through the battery radiator 1, the three-way valve 6, the four-way valve 14 and the PTC heater 13 in the closed state in sequence and then returns to the power battery 7 for circulation cooling, so that circulation cooling can be achieved through the battery radiator 1 when the temperature of the power battery is relatively low.

[0082] Example 3

[0083] like Figures 1 to 3 On the basis of Embodiments 1 and 2, when the real-time temperature value of the power battery 7 is greater than the preset temperature value c and less than the preset temperature value b, the four-way valve 14 maintains the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, and the three-way valve 6 maintains the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve, and then controls the four-way valve 14 to switch to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and controls the PTC heater 13 to be turned off.

[0084] The beneficial effect of adopting the preferred solution in the above embodiment is that when the power battery 7 is between the preset temperature value c and the preset temperature value b, the PTC heater 13 is turned off, and only the residual heat of the motor in the motor circuit assembly is needed to heat the battery pack, thereby reducing energy consumption.

[0085] Example 4

[0086] like Figures 1 to 3 , on the basis of Embodiment 1-3, when the real-time temperature value of the power battery 7 is equal to the preset temperature value a, the three-way valve 6 maintains the connection between the third port 63 of the three-way valve and the first port 61 of the three-way valve, and the four-way valve 14 maintains the connection between the first port 141 of the four-way valve and the second port 142 of the four-way valve, and the PTC heater 13 remains closed;

[0087] When the real-time temperature value of the power battery 7 is equal to the preset temperature value b, the four-way valve 14 maintains the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, and the three-way valve 6 maintains the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve, and then the four-way valve 14 switches to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and controls the PTC heater 13 to be turned off;

[0088] When the real-time temperature value of the power battery 7 is equal to the preset temperature value c, the four-way valve 14 maintains the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, the three-way valve 6 switches to the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve, and then the four-way valve 14 switches to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and the PTC heater 13 remains on.

[0089] That is, when the real-time temperature value of the power battery 7 is equal to the preset temperature value a, such as 28° C., it is only necessary to implement circulation cooling through the battery radiator 1 .

[0090] When the real-time temperature value of the power battery 7 is equal to the preset temperature value b, such as 13°C, when the power battery is between the preset temperature value c and the preset temperature value b, the PTC heater is turned off, and only the residual heat of the motor in the motor circuit assembly is needed to heat the battery pack, thereby reducing energy consumption.

[0091] When the real-time temperature value of the power battery 7 is equal to the preset temperature value c, such as 4°C, the PTC heater 13 can be used for heating, and at the same time, the corresponding ports of the four-way valve 14 and the three-way valve 6 are opened, so that the coolant coming out of the motor in the motor circuit assembly passes through the four-way valve 14 and the PTC heater 13 in sequence and heats the power battery 7 at the same time.

[0092] Example 5

[0093] like Figures 1 to 3 On the basis of Embodiment 1-4, a first expansion valve 5 is provided on the line connecting the condenser 18 to the cold exchanger 16 .

[0094] The beneficial effect of adopting the preferred solution in the above embodiment is that the medium-pressure refrigerant output through the condenser 18 is converted into a low-temperature and low-pressure refrigerant through the first expansion valve 5.

[0095] Example 6

[0096] like Figures 1 to 3 On the basis of Embodiment 1-5, the outlet of the condenser 18 is connected to the second expansion valve 3 , the outlet of the second expansion valve 3 is connected to the evaporator 2 installed in the cockpit, and the outlet of the evaporator 2 is connected to the compressor 17 .

[0097] The beneficial effect of adopting the preferred scheme in the above embodiment is that the low-temperature and low-pressure gaseous refrigerant is transformed into a low-temperature and low-pressure liquid refrigerant after passing through the compressor 17, the condenser 18 and the second expansion valve 3, enters the evaporator 2 to absorb the heat in the cockpit and is transformed into a gaseous refrigerant and returns to the compressor 17, thereby realizing cooling of the cockpit. The refrigeration circuit and the power battery 7 share a compressor 17, thereby increasing the economy of the overall vehicle layout.

[0098] As a parallel solution of the above embodiment, the condenser 18 is equipped with a fan to accelerate the air flow speed on the surface of the condenser 18, thereby improving the heat transfer efficiency and allowing the condenser 18 to dissipate heat faster.

[0099] Example 7

[0100] like Figures 1 to 3 On the basis of embodiments 1-6, the thermal management system further includes a heater core 4 installed in the cockpit, and the heater core 4 is connected to an external power source.

[0101] The beneficial effect of adopting the preferred solution in the above embodiment is that the cockpit is heated by the heater core 4 .

[0102] Example 8

[0103] like Figures 1 to 3 On the basis of Embodiment 1-7, a battery water pump 15 is provided on the pipeline connecting the cooler 16 and the four-way valve 14 .

[0104] The beneficial effect of adopting the preferred solution in the above embodiment is that the coolant discharged from the cooler 16 is pumped to the four-way valve 14 .

[0105] Example 9

[0106] like Figures 1 to 3 On the basis of Examples 1-8, the motor circuit assembly includes a plurality of motors 10 and a plurality of water pumps 11 respectively arranged on the plurality of motors 10, each motor 10 is also connected to a second water collector 9, the outlet of the second water collector 9 is connected to a third port 143 of a four-way valve 14, and the inlet of each water pump 11 is also connected to a first water collector 12, the inlet of the first water collector 12 is connected to a fourth port 144 of a four-way valve 14.

[0107] The beneficial effect of adopting the preferred solution in the above embodiment is that the coolant configured for each motor 10 is simultaneously directed to the four-way valve 14 through the second water collector 9 for unified processing.

[0108] As a specific solution of this embodiment, the first water collector 12 has inlet A and inlet B, and the second water collector 9 has outlet A and outlet B. Outlet B of the second water collector 9 is connected to the four-way valve 14 , and inlet B of the first water collector 12 is connected to the four-way valve 14 .

[0109] Example 10

[0110] like Figures 1 to 3 On the basis of Embodiment 1-9, the outlet of the second water collector 9 is connected to the motor radiator 19 , and the outlet of the motor radiator 19 is connected to the inlet of the first water collector 12 .

[0111] The beneficial effect of adopting the preferred solution in the above embodiment is that the heat dissipation operation of the motor in the motor circuit assembly is achieved through the motor heat sink 19.

[0112] The motor radiator 19 is equipped with a fan to accelerate the heat dissipation efficiency of the motor radiator 19 .

[0113] As a specific solution of this embodiment, the outlet A of the second water collector 9 is communicated with the motor radiator 19 , and the inlet A of the first water collector 12 is communicated with the motor radiator 19 .

[0114] Embodiment 11

[0115] like Figures 1 to 3 On the basis of Embodiment 1-10, the outlet of the second water collector 9 is provided with a solenoid valve 8 .

[0116] The beneficial effect of adopting the preferred solution in the above embodiment is that the opening and closing control of the pipeline is achieved through the solenoid valve 8.

[0117] The solenoid valve 8 is provided with a valve port A and a valve port B, and the valve port A and the valve port B are respectively arranged corresponding to the outlet A and the outlet B of the second water collector 9 .

[0118] By adopting the above scheme, the present invention has the following advantages:

[0119] 1. By setting the four-way valve 14, the motor circuit assembly is connected with the circuit where the power battery 7 is located, so that the power battery 7 can make full use of the motor waste heat of the motor circuit assembly. On the one hand, the energy consumption of the PTC heater 13 is reduced, so that the power battery 7 is heated up quickly. On the other hand, the motor waste heat is used to keep the power battery 7 at a suitable working temperature, improve the battery working efficiency, and at the same time help to extend the service life of the power battery 7.

[0120] 2: A battery radiator 1 is added, and the battery radiator 1 can be flexibly selected for convection heat dissipation and heat exchange between the compressor 17 and the battery coolant. When the temperature of the power battery 7 is relatively low and needs to be cooled, the battery radiator 1 can be selected for convection heat dissipation to reduce the energy consumption of the whole machine.

[0121] 3: The cockpit air conditioning system compressor and the battery cooling circuit share one compressor 17, which facilitates component layout and increases economy.

[0122] The specific implementation of the thermal management system of the present invention is described in detail through the following examples.

[0123] As preset conditions: the preset temperature value a of the power battery 7 is set to any value in the range of 25-30°C, such as 27°C; the preset temperature value b is set to any value in the range of 10-15°C, such as 12°C; the preset temperature value c is set to any value in the range of 0-5°C, such as 2°C. The ambient temperature value is 20±5°C.

[0124] Example 1: The real-time temperature value of the power battery 7 is measured to be 0° C. At this time, while the PTC heater 13 is heating, the coolant coming out of the motor in the motor circuit assembly heats the power battery 7 at the same time.

[0125] Example 2: The real-time temperature value of the power battery 7 is measured to be 4° C. At this time, the PTC heater 13 is turned off, and only the residual heat of the motor in the motor circuit assembly heats the battery pack.

[0126] Example 3: The real-time temperature value of the power battery 7 is measured to be 11° C. At this time, the PTC heater 13 is turned off, and only the residual heat of the motor in the motor circuit assembly heats the battery pack.

[0127] Example 4: The real-time temperature value of the power battery 7 is measured to be 14°C. At this time, the real-time temperature value of 14°C is less than the minimum ambient temperature value of 15°C. At this time, the real-time temperature value of the power battery 7 is relatively low, and the heat can be dissipated only by the battery radiator 1. The coolant coming out of the power battery 7 is circulated and cooled through the battery radiator 1 in turn.

[0128] Example 5: The real-time temperature value of the power battery 7 is measured to be 20°C. At this time, although the real-time temperature value of 20°C is within the range of the ambient temperature value of 20±5°C, the real-time temperature value of 20°C is lower than the preset temperature value a 27°C. Therefore, the real-time temperature value of the power battery 7 is relatively low, and the heat can be dissipated only by the battery radiator 1. The coolant coming out of the power battery 7 is circulated and cooled through the battery radiator 1 in turn.

[0129] Example 6: The real-time temperature value of the power battery 7 is measured to be 25°C. At this time, although the real-time temperature value of 20°C is within the range of the ambient temperature value of 20±5°C, the real-time temperature value of 20°C is less than the preset temperature value a 27°C. Therefore, the real-time temperature value of the power battery 7 is relatively low, and the heat can be dissipated only by the battery radiator 1. The coolant from the power battery 7 is circulated and cooled through the battery radiator 1 in turn.

[0130] Example 7: The real-time temperature value of the power battery 7 is measured to be 30°C. At this time, the real-time temperature value of 30°C is greater than the preset temperature value a 27°C, and greater than the maximum ambient temperature value 25°C. Therefore, the real-time temperature value of the power battery 7 is relatively high, and the power battery 7 is subjected to exchange circulation cooling operation by compressing the refrigerant through the battery radiator 1 and the compressor 17.

[0131] In a second aspect, the present invention provides an agricultural machine, as described in detail below.

[0132] Example 12

[0133] An agricultural machine includes a thermal management system as described in Examples 1-11.

[0134] In some embodiments, the agricultural machinery may be various types of tractors, harvesters, and combine harvesters, etc.

[0135] In a third aspect, the present invention provides a control method for a thermal management system, which is described in detail below.

[0136] Example 13

[0137] A control method for a thermal management system is applied to the thermal management system as described in Embodiments 1-11, and the control method comprises:

[0138] Detecting the real-time temperature value of the power battery 7;

[0139] Determine the relationship between the real-time temperature value and the preset temperature value b, and determine the relationship between the real-time temperature value and the temperature value -30°C and the preset temperature value c, the preset temperature value b is greater than the preset temperature value c;

[0140] When the real-time temperature value of the power battery 7 is greater than the preset temperature value b, the three-way valve 6 is controlled to switch to the third port 63 of the three-way valve and the first port 61 of the three-way valve are connected, and the four-way valve 14 is controlled to switch to the first port 141 of the four-way valve and the second port 142 of the four-way valve are connected, and the PTC heater 13 remains in the closed state;

[0141] When the real-time temperature value of the power battery 7 is between -30°C and the preset temperature value c, the four-way valve 14 is controlled to maintain the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, the three-way valve 6 is controlled to switch to the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve, and then the four-way valve 14 is controlled to switch to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and the PTC heater 13 is controlled to remain in the open state.

[0142] The beneficial effect of adopting the preferred scheme in the above embodiment is that by setting the four-way valve 14 in the thermal management system, the battery can use the residual heat of the motor to quickly heat up at low temperatures or make the battery work in a suitable temperature range, thereby reducing the energy consumption of the PTC heater, improving the efficiency of the whole vehicle, and extending the service life of the battery; on the other hand, in order to reduce the energy consumption of battery heat dissipation, convection heat can be dissipated through the battery radiator when the battery temperature is not high.

[0143] Embodiment 14

[0144] Based on Example 12, the control method further includes:

[0145] Detect the real-time ambient temperature value, which is 20±5℃;

[0146] Determine the relationship between the real-time temperature value of the power battery 7, the preset temperature value a and the ambient temperature value, the preset temperature value a is greater than the preset temperature value b;

[0147] When the real-time temperature value of the power battery 7 is greater than the preset temperature value a, and the real-time temperature value is greater than the ambient temperature value, the three-way valve 6 is controlled to maintain the connection between the third port 63 of the three-way valve and the first port 61 of the three-way valve, and the four-way valve 14 is controlled to maintain the connection between the first port 141 of the four-way valve and the second port 142 of the four-way valve, and the PTC heater 13 is controlled to remain in a closed state;

[0148] When the real-time temperature value of the power battery 7 is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve 6 is controlled to maintain the communication between the third port 63 of the three-way valve and the first port 61 of the three-way valve, and the four-way valve 14 is controlled to maintain the communication between the first port 141 of the four-way valve and the second port 142 of the four-way valve, and the PTC heater 13 is controlled to remain closed;

[0149] The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b.

[0150] The beneficial effect of adopting the preferred solution in the above embodiment is that when the battery operating temperature is high, a cooling method of heat exchange between the compressor compressing the refrigerant and the battery coolant is selected to reduce energy consumption.

[0151] Embodiment 15

[0152] Based on Example 14, the control method further includes:

[0153] Determine the relationship between the real-time temperature value of the power battery 7 and the preset temperature value b and the preset temperature value c;

[0154] When the real-time temperature value of the power battery 7 is greater than the preset temperature value c and less than the preset temperature value b, the four-way valve 14 is controlled to maintain the connection between the third port 143 of the four-way valve and the second port 142 of the four-way valve, and the three-way valve 6 is controlled to maintain the connection between the second port 62 of the three-way valve and the first port 61 of the three-way valve. Then, the four-way valve 14 is controlled to switch to the connection between the first port 141 of the four-way valve and the fourth port 144 of the four-way valve, and the PTC heater 13 is controlled to remain in a closed state.

[0155] The beneficial effect of adopting the preferred solution in the above embodiment is that when the real-time temperature value of the power battery 7 is between the preset temperature value b and the preset temperature value c, the power battery 7 only needs to be heated by the residual heat of the motor, and the PTC heater 13 is turned off, which can reduce energy consumption.

[0156] Example 16

[0157] On the basis of Example 15, the second expansion valve 3 is controlled to be opened and connected to the condenser 18, and the evaporator 2 is controlled to be opened.

[0158] The beneficial effect of adopting the preferred scheme in the above embodiment is that the low-temperature and low-pressure gaseous refrigerant is converted into a low-temperature and low-pressure liquid refrigerant, which can absorb the heat of the cockpit after entering the evaporator 2, that is, the cockpit air conditioning and the power battery 7 cooling circuit share a compressor 17, thereby increasing the economy of the vehicle layout.

[0159] In a fourth aspect, the present invention further provides a non-volatile readable storage medium, as described in detail below.

[0160] Embodiment 17

[0161] A non-volatile readable storage medium having a computer program stored thereon, which, when executed, implements the control method of the thermal management system described in any one of Examples 13-16.

[0162] In some embodiments, the non-volatile readable storage medium may be a storage device in various forms, such as a chip, a hard disk, a flash memory, etc. The computer program on the storage medium includes all codes and logics of the power battery thermal management method and can be executed on the controller.

[0163] According to the non-volatile readable storage medium of the embodiment of the present invention, by executing a computer program that implements the control method of the thermal management system described in the above embodiment, the motor circuit assembly and the circuit where the power battery 7 is located can be combined, so that the power battery 7 can make full use of the motor waste heat in the motor circuit assembly, reduce the energy consumption of the PTC heater 13, and quickly heat up the power battery 7. The motor waste heat can be used to keep the power battery 7 at a suitable operating temperature, thereby improving the battery working efficiency and helping to extend the battery life.

[0164] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0165] 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 the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0166] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0167] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0168] 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 invention. 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.

[0169] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A thermal management system, characterized in that: The invention comprises a motor circuit assembly, a four-way valve (14) whose third port (143) of the four-way valve is connected to the outlet of the motor circuit assembly, a PTC heater (13) whose inlet is connected to the second port (142) of the four-way valve of the four-way valve (14), a power battery (7) whose inlet is connected to the outlet of the PTC heater (13), and a three-way valve (6) whose second port (62) of the three-way valve is connected to the outlet of the power battery (7), wherein the first port (61) of the three-way valve (6) is connected to the first port (141) of the four-way valve (14), and the fourth port (144) of the four-way valve (14) is also connected to the inlet of the motor circuit assembly, the outlet of the power battery (7) is also connected to a battery radiator (1), and the outlet of the battery radiator (1) is connected to the third port (63) of the three-way valve (6); Wherein, when the real-time temperature value of the power battery (7) is greater than a preset temperature value b, the three-way valve (6) is switched to connect the third port (63) of the three-way valve with the first port (61) of the three-way valve, and the four-way valve (14) is switched to connect the first port (141) of the four-way valve with the second port (142) of the four-way valve, and the PTC heater (13) remains closed; When the real-time temperature value of the power battery (7) is between -30°C and a preset temperature value c, the four-way valve (14) maintains the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, the three-way valve (6) switches to the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) switches to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and the PTC heater (13) remains turned on; The preset temperature value b is greater than the preset temperature value c; A cooler (16) is provided on the line between the three-way valve first port (61) of the three-way valve (6) and the four-way valve first port (141) of the four-way valve (14); the outlet of the cooler (16) is connected to a compressor (17); the outlet of the compressor (17) is connected to a condenser (18); the outlet of the condenser (18) is connected to the inlet of the cooler (16); When the real-time temperature value of the power battery (7) is greater than a preset temperature value a, and the real-time temperature value is greater than an ambient temperature value, the three-way valve (6) maintains the communication between the third port (63) of the three-way valve and the first port (61) of the three-way valve, and the four-way valve (14) maintains the communication between the first port (141) of the four-way valve and the second port (142) of the four-way valve, and the PTC heater (13) remains in a closed state; When the real-time temperature value of the power battery (7) is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve (6) maintains the communication between the third port (63) of the three-way valve and the first port (61) of the three-way valve, and the four-way valve (14) maintains the communication between the first port (141) of the four-way valve and the second port (142) of the four-way valve, and the PTC heater (13) remains closed; The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b, and the ambient temperature value is 20±5°C; When the real-time temperature value of the power battery (7) is greater than a preset temperature value c and less than a preset temperature value b, the four-way valve (14) maintains the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, and the three-way valve (6) maintains the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) switches to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and controls the PTC heater (13) to be turned off.

2. A thermal management system according to claim 1, characterized in that: When the real-time temperature value of the power battery (7) is equal to the preset temperature value a, the three-way valve (6) maintains the communication between the third port (63) of the three-way valve and the first port (61) of the three-way valve, and the four-way valve (14) maintains the communication between the first port (141) of the four-way valve and the second port (142) of the four-way valve, and the PTC heater (13) remains closed; When the real-time temperature value of the power battery (7) is equal to the preset temperature value b, the four-way valve (14) maintains the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, and the three-way valve (6) maintains the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) switches to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and controls the PTC heater (13) to be turned off; When the real-time temperature value of the power battery (7) is equal to the preset temperature value c, the four-way valve (14) maintains the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, the three-way valve (6) switches to the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) switches to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and the PTC heater (13) remains turned on.

3. A thermal management system according to claim 1, characterized in that: A first expansion valve (5) is provided on the line connecting the condenser (18) to the cold exchanger (16).

4. A thermal management system according to claim 1, characterized in that: The outlet of the condenser (18) is connected to a second expansion valve (3), the outlet of the second expansion valve (3) is connected to an evaporator (2) installed in the cockpit, and the outlet of the evaporator (2) is connected to the compressor (17).

5. A thermal management system according to claim 4, characterized in that: The thermal management system further comprises a heater core (4) installed in the cockpit, and the heater core (4) is externally connected to a power source.

6. A thermal management system according to claim 1, characterized in that: A battery water pump (15) is provided on the pipeline connecting the cooler (16) and the four-way valve (14).

7. A thermal management system according to any one of claims 1 to 6, characterized in that: The motor circuit assembly comprises a plurality of motors (10) and a plurality of water pumps (11) respectively arranged on the plurality of motors (10); each of the motors (10) is simultaneously connected to a second water collector (9); an outlet of the second water collector (9) is connected to a third port (143) of the four-way valve (14); and an inlet of each of the water pumps (11) is simultaneously connected to a first water collector (12); an inlet of the first water collector (12) is connected to a fourth port (144) of the four-way valve (14).

8. A thermal management system according to claim 7, characterized in that: The outlet of the second water collector (9) is connected to a motor radiator (19), and the outlet of the motor radiator (19) is connected to the inlet of the first water collector (12).

9. A thermal management system according to claim 7, characterized in that: The outlet of the second water collector (9) is provided with a solenoid valve (8).

10. An agricultural machine, characterized in that: Comprising a thermal management system as described in any one of claims 1-9.

11. A control method for a thermal management system, applied to the thermal management system according to any one of claims 1 to 9, characterized in that: The control method comprises: Detecting the real-time temperature value of the power battery (7); Determine the relationship between the real-time temperature value and the preset temperature value b, and determine the relationship between the real-time temperature value and the temperature value -30°C and the preset temperature value c, the preset temperature value b is greater than the preset temperature value c; When the real-time temperature value of the power battery (7) is greater than a preset temperature value b, the three-way valve (6) is controlled to switch to a state where the third port (63) of the three-way valve is connected to the first port (61) of the three-way valve, and the four-way valve (14) is controlled to switch to a state where the first port (141) of the four-way valve is connected to the second port (142) of the four-way valve, and the PTC heater (13) remains in a closed state; When the real-time temperature value of the power battery (7) is between -30°C and a preset temperature value c, the four-way valve (14) is controlled to maintain the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, the three-way valve (6) is controlled to switch to the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) is controlled to switch to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and the PTC heater (13) is controlled to remain in an open state.

12. A control method for a thermal management system according to claim 11, characterized in that: The control method further comprises: Detect the real-time ambient temperature value, which is 20±5℃; Determining the relationship between the real-time temperature value of the power battery (7), the preset temperature value a, and the ambient temperature value; When the real-time temperature value of the power battery (7) is greater than a preset temperature value a, and the real-time temperature value is greater than an ambient temperature value, the three-way valve (6) is controlled to maintain the third port (63) of the three-way valve in communication with the first port (61) of the three-way valve, the four-way valve (14) is controlled to maintain the first port (141) of the four-way valve in communication with the second port (142) of the four-way valve, and the PTC heater (13) is controlled to remain in a closed state; When the real-time temperature value of the power battery (7) is greater than the preset temperature value b and less than the preset temperature value a, the three-way valve (6) is controlled to maintain the third port (63) of the three-way valve and the first port (61) of the three-way valve in communication, the four-way valve (14) is controlled to maintain the first port (141) of the four-way valve and the second port (142) of the four-way valve in communication, and the PTC heater (13) is controlled to remain closed; The preset temperature value a is greater than the ambient temperature value, and the ambient temperature value is greater than the preset temperature value b.

13. The control method of a thermal management system according to claim 11, characterized in that: The control method further comprises: Determining the relationship between the real-time temperature value of the power battery (7) and the preset temperature value b and the preset temperature value c; When the real-time temperature value of the power battery (7) is greater than a preset temperature value c and less than a preset temperature value b, the four-way valve (14) is controlled to maintain the connection between the third port (143) of the four-way valve and the second port (142) of the four-way valve, the three-way valve (6) is controlled to maintain the connection between the second port (62) of the three-way valve and the first port (61) of the three-way valve, and then the four-way valve (14) is controlled to switch to the connection between the first port (141) of the four-way valve and the fourth port (144) of the four-way valve, and the PTC heater (13) is controlled to remain in a closed state.

14. The control method of a thermal management system according to claim 12, characterized in that: The second expansion valve (3) is controlled to open and communicate with the condenser (18), and the evaporator (2) is controlled to open.

15. A non-volatile readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the control method of the thermal management system according to any one of claims 11 to 14 is implemented.

Images