Thermal management system and control method thereof, vehicle, storage medium and storage device

Abstract

The invention discloses a thermal management system and a control method thereof, a vehicle, a storage medium and a storage device.The thermal management system comprises a battery subsystem, the battery subsystem comprises at least one heat exchange branch, the heat exchange branch is used for exchanging heat with a battery, and the control method comprises the steps that a battery heating signal is obtained; and the heat management system enters a preheating mode, and in the preheating mode, the temperature of the heat exchange medium at the outlet end of at least one heat exchange branch is larger than or equal to a first threshold value T1. The temperature of the heat exchange medium at the outlet end of at least one heat exchange branch is set to be larger than or equal to the first threshold value T1, the heat exchange medium at the outlet end is controlled to be kept in a certain state, and the damage probability of the compressor is reduced.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 2023108106003 and application date of July 3, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present invention relates to the field of vehicle technology, and in particular to a thermal management system and a control method thereof, a vehicle, a storage medium and a storage device. Background Art

[0004] Battery heating on vehicles usually uses the gaseous refrigerant discharged from the compressor to exchange heat with the battery. The gaseous refrigerant exchanges heat with the battery, and when heating the battery, the gaseous refrigerant cools down and depressurizes to be liquefied. Related technology When the battery temperature is low or the heat exchange area of ​​the battery is large or the flow resistance of the battery heat exchange module is large, the heat exchange medium will excessively exchange heat in the battery heat exchange module, resulting in low intake pressure and low exhaust pressure (high pressure and low pressure) of the compressor, which exceeds the operating range of the compressor and may cause damage to the compressor. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a control method for a thermal management system to reduce the probability of compressor damage.

[0006] The present invention also proposes a thermal management system that applies the above control method to reduce the probability of compressor damage.

[0007] The present invention also proposes a vehicle using the above control method to reduce the probability of compressor damage.

[0008] The present invention also proposes a storage medium for executing the above control method, thereby reducing the probability of compressor damage.

[0009] The present invention also proposes a storage device including the above storage medium to reduce the probability of compressor damage.

[0010] According to a control method of a thermal management system of an embodiment of the present invention, the thermal management system includes a battery subsystem, the battery subsystem includes at least one heat exchange branch, and the heat exchange branch is used for heat exchange with the battery. The control method includes: obtaining a battery heating signal; the thermal management system enters a preheating mode, and in the preheating mode, the temperature of the heat exchange medium at the outlet end of at least one of the heat exchange branches is greater than or equal to a first threshold value T1.

[0011] According to the control method of the thermal management system of an embodiment of the present invention, by setting the temperature of the heat exchange medium at the outlet end of at least one heat exchange branch to be greater than or equal to the first threshold value T1, the heat exchange medium at the outlet end is controlled to remain within a certain temperature state to avoid excessive liquefaction of the heat exchange medium in the heat exchanger, thereby increasing the compressor outlet pressure and avoiding the compressor from exceeding the operating range and causing damage to the compressor.

[0012] In some embodiments, the temperature difference between the heat exchange medium at the inlet end and the outlet end of at least one of the heat exchange branches is ΔT≦T2, where T2 is the second threshold value.

[0013] In some embodiments, when the temperature of the battery reaches a first temperature, the thermal management system enters a normal heating mode. In the normal heating mode, at least one of the heat exchange branches is controlled to be turned on according to the real-time temperature of the battery to heat the battery.

[0014] In some embodiments, the battery subsystem includes a plurality of heat exchange branches connected in parallel, and the plurality of heat exchange branches are used for heat exchange with the battery. The plurality of heat exchange branches include a pressure regulating sub-branch. In the preheating mode, the temperature of the heat exchange medium at the outlet end of the pressure regulating sub-branch is controlled to be greater than or equal to a first threshold value T1.

[0015] In some embodiments, in the preheating mode, the temperature difference between the inlet and outlet ends of the pressure regulating sub-branch is controlled to be ΔT≦T2.

[0016] In some embodiments, at least one heat exchange branch is used to exchange heat with a first side of the battery, and at least one heat exchange branch is used to exchange heat with a second side of the battery.

[0017] In some embodiments, the plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch. In the preheating mode, a total flow Q1 in the pressure regulating sub-branch is greater than a total flow Q2 in the heat exchange sub-branch.

[0018] In some embodiments, in the preheating mode, a ratio Q1 / Q2 of a total flow rate Q1 of the heat exchange medium in the pressure regulating sub-branch to a total flow rate Q2 of the remaining heat exchange branches is greater than a third threshold.

[0019] In some embodiments, the plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch, and at least a portion of the heat exchange branches include a flow regulating valve, which controls the valve opening in the pressure regulating sub-branch to be greater than the valve opening in the heat exchange sub-branch.

[0020] In some embodiments, the plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch, and in the preheating mode, the heat exchange sub-branch is controlled to be in a non-working state.

[0021] In some embodiments, when a minimum value among temperature values ​​at a plurality of locations of the battery reaches the first set temperature, the temperature of the battery reaches the first temperature.

[0022] In some embodiments, the thermal management system also includes a normal heating mode, the heat exchange branch includes a pressure regulating sub-branch, and the flow rate of the pressure regulating sub-branch in the preheating mode is greater than the flow rate of the pressure regulating sub-branch in the normal heating mode.

[0023] In some embodiments, the heat exchange branch includes a battery heat exchange module and a throttling element connected in series, and the opening of the throttling element is adjusted according to the superheat of the heat exchange medium in the heat exchange branch.

[0024] In some embodiments, in the preheating mode, adjusting the opening of the throttling element according to the superheat of the heat exchange medium in the heat exchange branch includes: the superheat △T4 is less than the first set value △Ta, reducing the opening of the throttling element; the superheat △T4 is greater than the second set value △Tb, increasing the opening of the throttling element; the superheat △Ta≤△T4≤△Tb, maintaining the opening of the throttling element.

[0025] In some embodiments, the plurality of heat exchange branches include a bottom heat exchange branch and a top heat exchange branch, the top heat exchange branch is located at the top of the battery and the bottom heat exchange branch is located at the bottom of the battery; in the preheating mode, the temperature difference ΔT between the inlet and outlet ends of the bottom heat exchange branch is controlled to be less than a second threshold.

[0026] In some embodiments, the thermal management system further includes a coolant subsystem; the control method further includes: when a waste heat recovery instruction is obtained, the coolant subsystem exchanges heat with the battery subsystem.

[0027] In some embodiments, the thermal management system has a normal heating mode. In the normal heating mode, each of the heat exchange branches is controlled to heat the battery. When the water temperature of the coolant subsystem reaches a third set temperature, the thermal management system enters the normal heating mode.

[0028] According to an embodiment of the present invention, the thermal management system includes: a compressor having an air inlet and an exhaust port; at least one heat exchange branch, the heat exchange branch performs heat exchange with a battery, the thermal management system has a battery heating mode, in which the first end of the heat exchange branch is connected to the exhaust port; a first heat exchanger, the first end of the first heat exchanger is connected to the second end of the heat exchange branch via a throttling element, and the second end of the first heat exchanger is connected to the air inlet; and a control module, the control module being configured to execute the control method of the thermal management system described above.

[0029] According to the thermal management system of the embodiment of the present invention, by applying the above control method, the heat exchange medium at the outlet end is controlled to remain within a certain temperature state, thereby increasing the compressor outlet pressure and avoiding the compressor from exceeding the operating range and causing damage to the compressor.

[0030] A vehicle according to an embodiment of the present invention includes a thermal management system and a control module, wherein the control module is configured to execute the control method of the thermal management system.

[0031] According to the vehicle of the embodiment of the present invention, a control module is set to execute the control method of the thermal management system, so that the heat exchange medium at the outlet end is controlled to remain within a certain temperature state, thereby increasing the compressor outlet pressure and avoiding the compressor from exceeding the operating range and causing damage to the compressor.

[0032] According to the storage medium of the embodiment of the present invention, the storage medium is configured to execute the control method of the thermal management system described above.

[0033] According to the storage medium of the embodiment of the present invention, by executing the control method of the thermal management system mentioned above, the heat exchange medium at the outlet is controlled to remain within a certain temperature state, thereby increasing the compressor outlet pressure and avoiding the compressor from exceeding the operating range and causing damage to the compressor.

[0034] A storage device according to an embodiment of the present invention includes the above-mentioned storage medium.

[0035] The storage device according to the embodiment of the present invention controls the heat exchange medium at the outlet to maintain a certain temperature state by applying the above storage medium, thereby increasing the compressor outlet pressure and preventing the compressor from exceeding the operating range and causing damage to the compressor.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 A flow chart of a control method of a thermal management system according to some embodiments of the present invention;

[0039] Figure 2 A structural diagram of a thermal management system according to an embodiment of the present invention;

[0040] Figure 3 A structural diagram of a thermal management system in a battery heating mode according to an embodiment of the present invention, wherein arrows in the figure indicate the flow direction of the refrigerant;

[0041] Figure 4 Flow charts of control methods of thermal management systems according to other embodiments of the present invention;

[0042] Figure 5 A structural diagram of a battery heat exchange module according to some embodiments of the present invention;

[0043] Figure 6 The following are structural diagrams of battery heat exchange modules according to other embodiments of the present invention.

[0044] Reference numerals:

[0045] 100. Thermal management system;

[0046] 80. Battery subsystem; 15. Throttling element; 16. Flow control valve; 20. Heat exchange branch; 21. Pressure regulating sub-branch; 30. Outlet end; 40. Inlet end; 56. Battery heat exchange module; 60. Coolant subsystem;

[0047] 1. Compressor; 2. In-vehicle condenser; 3. Out-vehicle condenser; 4. First heat exchanger; 5. Battery upper cold plate; 6. Battery lower cold plate; 7. In-vehicle evaporator; 8. Gas-liquid separator; 10. Radiator; 11. Liquid storage tank; 12. Four-way water valve; 13. Powertrain; 14. Water pump; 151. First electronic expansion valve; 152. Second electronic expansion valve; 153. Third electronic expansion valve; 154. Fourth electronic expansion valve; 161. First large-caliber electronic expansion valve; 162. Second large-caliber electronic expansion valve Expansion valve; 171, first solenoid valve; 172, second solenoid valve; 173, third solenoid valve; 174, fourth solenoid valve; 181, first one-way valve; 182, second one-way valve; 184, fourth one-way valve; PT1, first temperature-pressure integrated sensor; PT2, second temperature-pressure integrated sensor; PT3, third temperature-pressure integrated sensor; PT4, fourth temperature-pressure integrated sensor; T2, second temperature sensor; T3, third temperature sensor; T4, fourth temperature sensor. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] The following describes the control method of the thermal management system according to the embodiment of the present invention in conjunction with the accompanying drawings. Figure 3As shown, the thermal management system 100 includes a battery subsystem 80, and the battery subsystem 80 includes at least one heat exchange branch 20, and the heat exchange branch 20 is used for heat exchange with the battery. Specifically, the battery subsystem 80 may include one heat exchange branch 20, or may include two heat exchange branches 20, or may include more than three heat exchange branches 20.

[0050] It should also be explained that the thermal management system 100 includes a compressor 1, the exhaust port of the compressor 1 can be connected to the heat exchange branch 20 to discharge the high-temperature gaseous heat exchange medium to the heat exchange branch 20, and the heat exchange medium that has exchanged heat with the battery in the heat exchange branch 20 can be discharged from the outlet port 30 to the air inlet of the compressor 1.

[0051] In some embodiments, the heat exchange medium of the heat exchange branch 20 can directly exchange heat with the battery. In other embodiments, the thermal management system 100 also includes a coolant circulation loop that performs heat exchange with the heat exchange branch 20, and the coolant circulation loop exchanges heat with the battery.

[0052] It should be noted that the battery includes a battery cell arranged in a shell, and the heat exchange branch can be directly in contact with the battery cell for heat exchange. The heat exchange branch 20 can also be in contact with the shell for heat exchange, thereby indirectly exchanging heat with the battery cell.

[0053] According to the control method of the thermal management system of the embodiment of the present invention, Figure 1 As shown, the control method includes:

[0054] S20: A battery heating signal is obtained.

[0055] S30: The thermal management system 100 enters the preheating mode. In the preheating mode, the temperature of the heat exchange medium at the outlet end 30 of at least one heat exchange branch 20 is greater than or equal to the first threshold value T1. It should be noted that when the battery subsystem includes two or more heat exchange branches 20, in the preheating mode, the temperature of the heat exchange medium at the outlet end of at least one heat exchange branch 20 among the multiple heat exchange branches 20 is controlled to be greater than or equal to the first threshold value T1.

[0056] When receiving an electrical signal, the thermal management system 100 enters the preheating mode, and the electrical signals that meet the above conditions (ie, control the thermal management system to enter the preheating mode) are all battery heating signals.

[0057] It should be noted that in the preheating mode, the heat exchange medium at the outlet 30 of at least one heat exchange branch 20 may be in gas phase, or may coexist with gas phase and liquid phase, as long as the temperature of the heat exchange medium at the outlet 30 is greater than or equal to the first threshold value T1.

[0058] Specifically, the present application defines that the temperature of the heat exchange medium is greater than or equal to the first threshold value T1, and the ratio of the gaseous heat exchange medium to the liquid heat exchange medium can be controlled to adjust the pressure of the compressor intake or exhaust to avoid damage to the compressor. For example, a higher first threshold value results in a higher ratio of the gaseous heat exchange medium, and a lower first threshold value results in a lower ratio of the gaseous heat exchange medium.

[0059] For example: when a battery heating instruction, a vehicle start instruction, a charging heating instruction, a discharging heating instruction, and a battery cell temperature lower than a preset value are received, the thermal management system 100 enters the preheating mode. When the controller receives these instructions or information, the signal that triggers the thermal management system 100 to enter the preheating mode is a battery heating signal. The controller can be in the thermal management system 100, or it can be a domain controller, or it can be a body controller, which is not limited here. The battery heating instruction, the vehicle start instruction, the charging heating instruction, and the discharging heating instruction can be triggered by the user on the mobile terminal. The transceiver of the vehicle receives these instructions. When the battery cell temperature is lower than the preset value, the thermal management system 100 enters the preheating mode. The battery heating instruction, the vehicle start instruction, the charging heating instruction, and the discharging heating instruction can also be triggered by the user on the vehicle side. When the controller receives these instructions, the battery cell temperature is lower than the preset value, the thermal management system 100 enters the preheating mode. Among them, the first threshold is a preset temperature value. It can be understood that the first threshold reflects the state of the heat exchange medium, and the state of the heat exchange medium at the outlet end 30 is controlled by controlling the first threshold. For example, the state of the heat exchange medium can include temperature and phase (gas phase or gas-liquid two-phase).

[0060] Specifically, different first thresholds are set corresponding to different heat exchange media to meet different requirements.

[0061] In the related technology, when the battery temperature is low or the heat exchange area of ​​the battery heat exchange is large or the flow resistance of the battery heat exchange module is large, the exhaust pressure of the compressor is low (high pressure and low) due to the large amount of heat exchange between the heat exchange medium in the heat exchange branch and the battery. On the one hand, the inlet temperature of the battery heat exchange module that exchanges heat with the battery is low, and the temperature difference between the battery and the battery is small, resulting in a low heating temperature rise rate and a slow heating rate. On the other hand, it will cause the compressor's air inlet pressure to be low (low pressure and low), which exceeds the compressor's operating range and may cause damage to the compressor.

[0062] The present application can control the state of the heat exchange medium at the outlet end 30 by setting the temperature of the heat exchange medium at the outlet end 30, so that the temperature of the heat exchange medium at the outlet end 30 is within the target state, thereby avoiding excessive pressure difference between the inlet end and the outlet end of the heat exchange branch 20, and further reducing the pressure difference between the air inlet and the air outlet of the compressor 1, which can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect of the battery being affected by the low temperature of the heat exchange medium.

[0063] According to the control method of the thermal management system of an embodiment of the present invention, by setting the temperature of the heat exchange medium at the outlet end 30 of at least one heat exchange branch 20 to be greater than or equal to the first threshold value T1, the heat exchange medium at the outlet end 30 is controlled to remain within a certain temperature state, thereby increasing the outlet pressure of the compressor 1 and preventing the compressor 1 from exceeding the operating range and causing damage to the compressor 1.

[0064] In some examples of the present invention, the first threshold value can be set to the saturation temperature of the heat exchange medium at the corresponding pressure of the outlet end 30 minus 5°C, that is, the subcooling degree of the heat exchange medium at the outlet end 30 of at least one heat exchange branch 20 is less than 5°C to avoid excessive liquefaction. Wherein, the subcooling degree is defined as the difference between the temperature of the condensed water at a certain pressure and the saturation temperature at the corresponding pressure.

[0065] In some examples of the present invention, the first threshold value can be set to 20°C, so that the temperature of the heat exchange medium passing through the outlet end 30 of at least one heat exchange branch 20 is ≥20°C, and the ratio of the gaseous heat exchange medium to the liquid heat exchange medium can be ensured to adjust the pressure of the compressor intake or exhaust to avoid damage to the compressor.

[0066] In some embodiments, the temperature difference ΔT≦T2 between the heat exchange medium at the inlet end 40 and the outlet end 30 in at least one heat exchange branch 20, where T2 is the second threshold. By setting the temperature difference between the heat exchange medium at the inlet end 40 and the outlet end 30 to be less than or equal to T2, the heat exchange of the heat exchange medium is controlled to avoid excessive liquefaction of the heat exchange medium.

[0067] It should be noted that the second threshold is a preset value, which can be calibrated according to actual conditions, and is a reference value, a calibration value, an experimental value, etc. It can be understood that the second threshold reflects the state change of the heat exchange medium at the inlet end 40 and the outlet end 30. By controlling the second threshold to control the state change of the heat exchange medium, excessive pressure difference at both ends of the heat exchange branch is further avoided.

[0068] Specifically, different second thresholds are set for different heat exchange media to meet different requirements. Alternatively, the second threshold can be set according to the temperature of the battery, the heat exchange area of ​​the battery heat exchange module, and the flow resistance of the battery heat exchange module.

[0069] In some embodiments of the present invention, the second threshold is 30° C., thereby further avoiding excessive pressure difference across the heat exchange branch.

[0070] In some embodiments, when the temperature of the battery reaches a first temperature, the thermal management system 100 enters a normal heating mode. In the normal heating mode, at least one heat exchange branch 20 is controlled to be turned on to heat the battery according to the temperature of the battery. The battery temperature may be a real-time temperature. By controlling the thermal management system 100 to enter the normal heating mode after the temperature of the battery reaches the first temperature, each heat exchange branch 20 is controlled to be turned on to heat the battery, and the battery is fully heated, so that the capacity of the thermal management system 100 is fully utilized.

[0071] Among them, the thermal management system 100 entering the normal heating mode means that the temperature of the battery reaches the first temperature. After the preheating mode, the battery will heat up, and the battery's demand for heating will be reduced, which will not cause the problem of low exhaust pressure and low intake pressure of the compressor 1.

[0072] Among them, at least one heat exchange branch 20 is controlled to be turned on according to the real-time temperature of the battery, and the control method is more adapted to the actual needs of the battery. For example, if the battery temperature is low, multiple heat exchange branches 20 can be turned on to heat the battery at the same time, or if the battery temperature is high, fewer heat exchange branches 20 can be controlled to heat the battery, thereby saving heat.

[0073] Specifically, the first temperature may be a preset temperature value. The first temperature may also be a value set in real time according to the ambient temperature or the temperature of the battery.

[0074] More specifically, different heat exchange media are set to different first temperatures to meet the requirements, or different battery types are set to different first temperatures to meet the requirements. For example, batteries made of different materials: lithium batteries and lithium iron phosphate batteries have different first temperatures; batteries of different shapes: blade batteries, square batteries, cylindrical batteries have different first temperatures; batteries of different capacities: batteries with a range of 80 kilometers and batteries with a range of 200 kilometers have different first temperatures. The first temperature can be set according to the heat exchange medium, battery material, battery shape, and battery capacity.

[0075] In some embodiments, the battery subsystem 80 includes a plurality of heat exchange branches 20 connected in parallel, and the plurality of heat exchange branches 20 are used for heat exchange with the battery. The plurality of heat exchange branches 20 include a pressure regulating sub-branch 21. In the preheating mode, the temperature of the heat exchange medium at the outlet end 30 of the pressure regulating sub-branch 21 is controlled to be greater than or equal to the first threshold value T1. The remaining branches except the pressure regulating sub-branch can be opened or closed according to the heat exchange requirements of the battery. When the remaining branches are opened, by setting the value of the first threshold value T1, the heating requirements of the battery can be met and the damage to the compressor can be avoided. By setting a plurality of heat exchange branches 20 in parallel, it is possible to select and control one or more heat exchange branches 20 to heat the battery according to the actual heating requirements of the battery, and the battery can be heated flexibly to achieve the purpose of energy saving.

[0076] In some embodiments, in the preheating mode, the temperature difference △T≦T2 between the inlet end 40 and the outlet end 30 in the pressure regulating sub-branch 21 is controlled. By setting the temperature difference △T≦T2 between the inlet end 40 and the outlet end 30 of the pressure regulating sub-branch 21, the state change of the heat exchange medium at the inlet end 40 and the outlet end 30 of the pressure regulating sub-branch 21 is controlled to maintain the pressure at the inlet end 40 and avoid excessive pressure difference at both ends of the heat exchange branch. According to the heat exchange requirements of the battery, the remaining branches except the pressure regulating sub-branch can be opened or closed. When the remaining branches are opened, by setting the value of T2, both the battery heating requirements and the compressor damage can be avoided.

[0077] It should be noted that the compressor 1 usually discharges high-pressure refrigerant and inhales low-pressure refrigerant. The compressor 1 usually works under the condition of high exhaust pressure and low inlet pressure. However, the battery heat exchange demand in the related technology is relatively large, resulting in low pressure at the compressor exhaust port, and the compressor cannot work normally, and there is a possibility of compressor damage. In this application, multiple heat exchange branches 20 include a pressure regulating sub-branch 21, and the temperature difference △T≦T2 between the inlet end 40 and the outlet end 30 in the pressure regulating sub-branch 21 is set to control the pressure of the pressure regulating sub-branch 21, and adjust the pressure at the exhaust port of the compressor 1, thereby reducing the probability of damage to the compressor 1.

[0078] In some embodiments, at least one heat exchange branch 20 is used to exchange heat with the first side of the battery, and at least one heat exchange branch 20 is used to exchange heat with the second side of the battery. In other words, multiple heat exchange branches 20 are used to heat different sides of the battery, so that the battery is fully heated and the temperature uniformity is improved.

[0079] For example, one of the heat exchange branches 20 is used to heat the upper side of the battery, and the other heat exchange branch 20 is used to heat the lower side of the battery; or, one of the heat exchange branches 20 is used to heat the left side of the battery, and the other heat exchange branch 20 is used to heat the right side of the battery; or, one of the heat exchange branches 20 is used to heat the front side of the battery, and the other heat exchange branch 20 is used to heat the rear side of the battery; of course, the first side and the second side are not limited to opposite sides, but can also be adjacent sides, for example, the first side is the upper side, the second side is the front side, etc., which will not be elaborated here.

[0080] In some embodiments, in the normal heating mode, multiple heat exchange branches 20 are controlled to heat the battery, thereby increasing the heating speed.

[0081] In some embodiments, in the preheating mode, the total flow Q1 in the pressure regulating sub-branch 21 is greater than the total flow Q2 of the remaining heat exchange branches. Specifically, the multiple heat exchange branches 20 include a pressure regulating sub-branch 24 and a heat exchange sub-branch. In the preheating mode, the total flow of the pressure regulating sub-branch 21 is controlled to be greater than the total flow of the heat exchange sub-branch, so that the flow of the heat exchange medium in the pressure regulating sub-branch 21 is larger, thereby avoiding the low exhaust pressure of the compressor due to the large heat exchange between the pressure regulating sub-branch 21 and the battery, avoiding the compressor 1 from exceeding the operating range and causing damage to the compressor 1, and avoiding the large heat exchange causing the temperature of the heat exchange medium to be low and affecting the heating effect on the battery.

[0082] In some embodiments, in the preheating mode, the ratio Q1 / Q2 of the total flow rate Q1 of the heat exchange medium of the pressure regulating sub-branch 21 to the total flow rate Q2 of the remaining heat exchange branches 20 (heat exchange sub-branches) is greater than the third threshold. By setting the ratio Q1 / Q2 of the total flow rate Q1 of the heat exchange medium of the pressure regulating sub-branch 21 to the total flow rate Q2 of the remaining heat exchange branches 20 to be greater than the third threshold, the heat exchange medium flowing out of the pressure regulating sub-branch and the heat exchange medium flowing out of the remaining branches will eventually enter the air inlet of the compressor. By setting the value of the third threshold, the intake pressure entering the air inlet of the compressor can be adjusted, thereby reducing the probability of damage to the compressor 1. When the battery temperature is low, the ratio Q1 / Q2 is greater than the third threshold value, and the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, since the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch 21 still meets the requirements for normal operation of the compressor 1, thereby avoiding the situation where the pressure at the exhaust port and the air inlet of the compressor 1 are lower than the normal operating values.

[0083] Specifically, Q1 is the total flow rate of the heat exchange medium in the pressure regulating sub-branch 21, wherein there can be only one pressure regulating sub-branch 21, and Q1 is the flow rate of the heat exchange medium in one pressure regulating sub-branch 21; there can also be multiple pressure regulating sub-branch 21, and Q1 is the total flow rate of the heat exchange medium in multiple pressure regulating sub-branch 21.

[0084] Specifically, Q2 is the total flow rate of the heat exchange medium of the remaining heat exchange branches 20, wherein there may be one remaining heat exchange branch 20, and Q1 is the flow rate of the heat exchange medium of one remaining heat exchange branch 20; there may also be multiple remaining heat exchange branches 20, and Q1 is the total flow rate of the heat exchange medium of multiple remaining heat exchange branches 20.

[0085] For example, there are two heat exchange branches 20, which are connected in parallel. One of the heat exchange branches 20 is constructed as a pressure regulating sub-branch 21. In the preheating mode, the flow rate of the heat exchange medium in the pressure regulating sub-branch 21 is Q1, and the flow rate of the other heat exchange branch 20 is Q2, and Q1 / Q2 is greater than the third threshold.

[0086] Alternatively, there are three heat exchange branches 20, which are connected in parallel. One of the heat exchange branches 20 is constructed as a pressure regulating sub-branch 21. In the preheating mode, the flow rate of the heat exchange medium in the pressure regulating sub-branch 21 is Q1, and the total flow rate of the other two heat exchange branches 20 is Q2, and Q1 / Q2 is greater than the third threshold.

[0087] Alternatively, there are three heat exchange branches 20, which are connected in parallel, and two of the heat exchange branches 20 are constructed as pressure regulating sub-branches 21. In the preheating mode, the flow rate of the heat exchange medium in the two pressure regulating sub-branches 21 is Q1, and the flow rate of the other heat exchange branch 20 is Q2, and Q1 / Q2 is greater than the third threshold value.

[0088] Specifically, the third threshold is a pre-set value. It can be understood that the third threshold reflects the concentration degree of the heat exchange medium. The concentration degree of the heat exchange medium is controlled by changing the third threshold, and the amount of heat exchange medium discharged by the compressor 1 entering the pressure regulating sub-branch 21 is adjusted, so that the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient. When the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch 21 still meets the requirements of the normal operation of the compressor 1, thereby avoiding the situation where the exhaust and inlet pressures of the compressor 1 are lower than the normal operating values.

[0089] For example, the third threshold is 2, that is, the flow on the pressure regulating sub-branch 21 accounts for more than two-thirds of the total flow, further improving the concentration of the heat exchange medium, and concentrating most of the heat exchange medium discharged from the compressor 1 on the pressure regulating sub-branch 21, so that the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient. When the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch 21 still meets the requirements of the normal operation of the compressor 1, thereby avoiding the situation where the pressure at the exhaust port and the air inlet of the compressor 1 are lower than the normal operating values.

[0090] The above can be simply understood as follows: in the related art, the upper limit of the total flow rate of the refrigerant supplied by the compressor is a fixed value, and more heat exchange branches have a greater demand for refrigerant. Each heat exchange branch is allocated less refrigerant, resulting in sufficient heat exchange between the refrigerant in each heat exchange branch and the battery. When the battery temperature is low, the degree of liquefaction of the refrigerant in the battery heat exchange module 56 in each heat exchange branch is relatively large, thereby affecting the pressure at the air inlet and exhaust port of the compressor, and further affecting the normal operation of the compressor. In this application, by setting Q1 / Q2 to be greater than the third threshold, the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, due to the sufficient amount of heat exchange medium in the pressure regulating sub-branch 21, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements for the normal operation of the compressor, thereby avoiding the situation where the pressure at the exhaust port and air inlet of the compressor 1 is lower than the normal operating value.

[0091] In some embodiments, at least one heat exchange branch 20 includes a flow regulating valve 16, and the ratio of the flow Q1 passing through the flow regulating valve 16 in the pressure regulating sub-branch 21 to the flow Q2 passing through the flow regulating valve 16 in the remaining heat exchange branches 20 satisfies that Q1 / Q2 is greater than a third threshold. By setting the flow regulating valve 16 to control the flow, rapid adjustment of the flow is facilitated.

[0092] It should be noted that the pressure regulating sub-branch 21 includes a flow regulating valve 16, and the other heat exchange branches 20 include flow regulating valves 16. By controlling the flow regulating valves 16, the pressure regulating sub-branch 21 and the other heat exchange branches 20 can be quickly switched. In other words, each heat exchange branch 20 can be a pressure regulating sub-branch 21.

[0093] In some embodiments, at least a portion of the heat exchange branches 20 include a flow regulating valve 16, which controls the valve 1 opening in the pressure regulating sub-branch 21 to be greater than the valve 2 opening in the remaining heat exchange branches 20. In other words, the flow regulating valve 16 on the pressure regulating sub-branch 21 is greater than the flow regulating valve 16 on the remaining heat exchange branches 20, and the heat exchange medium is concentrated on the pressure regulating sub-branch 21.

[0094] In some embodiments, in the preheating mode, the pressure regulating sub-branch 21 is in working state, and the remaining heat exchange branches 20 are controlled to be in non-working state. By controlling the pressure regulating sub-branch 21 to be in working state and the remaining heat exchange branches 20 to be in non-working state, the heat exchange medium is further concentrated on the pressure regulating sub-branch 21, thereby improving the concentration.

[0095] Specifically, the pressure regulating sub-branch 21 is in a working state, which means that heat exchange medium flows through the pressure regulating sub-branch 21 .

[0096] Specifically, the remaining heat exchange branches 20 are in a non-working state, which means that there is no heat exchange medium on the remaining heat exchange branches 20, so that the heat exchange medium discharged by the compressor 1 is collected in sufficient quantity and supplied to the pressure regulating sub-branch 21. This solution can reduce the selection requirements of the compressor 1, as long as the amount of heat exchange medium discharged by the compressor 1 can meet the needs of the pressure regulating sub-branch 21. When the heat exchange area of ​​the battery heat exchange module 56 in the pressure regulating sub-branch 21 is large, the heat exchange medium discharged by the compressor 1 is concentrated on the pressure regulating sub-branch 21, which can still meet the needs of the pressure regulating sub-branch 21.

[0097] In some specific embodiments, each heat exchange branch 20 includes a flow regulating valve 16, and the remaining heat exchange branches 20 are in a non-operating state, and the opening of the flow regulating valves 16 on the remaining heat exchange branches 20 is zero, thereby further concentrating the heat exchange medium. The heat exchange branch 20 being in a non-operating state means that there is no heat exchange medium on the remaining heat exchange branches 20.

[0098] In some embodiments, when the minimum value of the temperature values ​​at multiple locations of the battery reaches the first set temperature, the temperature of the battery reaches the first temperature. That is, when the temperature of the lowest temperature part of the battery is greater than the first set temperature, the thermal management system 100 enters the normal heating mode, and the temperature of the lowest temperature part of the battery is used as the standard to further avoid the occurrence of uneven heating of the battery. The first set temperature can be set according to the heat exchange capacity of the battery. For example, when the first temperature is reached, the target temperature of the battery is 30°C. At this time, according to the normal heating mode, according to the target temperature of the battery, multiple heat exchange branches are controlled to heat the battery without causing the pressure of the compressor inlet and exhaust port to be lower than its normal operating value.

[0099] In some embodiments, the thermal management system 100 further includes a normal heating mode, the heat exchange branch 20 includes a pressure regulating sub-branch 21, and the flow rate of the pressure regulating sub-branch 21 in the preheating mode is greater than the flow rate of the pressure regulating sub-branch 21 in the normal heating mode. By setting the flow rate of the pressure regulating sub-branch 21 in the preheating mode to be greater than the flow rate of the pressure regulating sub-branch 21 in the normal heating mode, the heat exchange medium is concentrated so that the amount of the heat exchange medium discharged by the compressor can meet the demand of the pressure regulating sub-branch 21.

[0100] For example, the first set temperature is 5° C., and the temperature of the lowest temperature part of the battery is greater than 5° C., and the thermal management system 100 enters the normal heating mode.

[0101] In some embodiments, the heat exchange branch 20 includes a battery heat exchange module 56 and a throttling element 15 connected in series, and the opening of the throttling element 15 is adjusted according to the superheat of the heat exchange medium in the heat exchange branch 20. The throttling element 15 adjusts the opening according to the superheat, adjusts the heat exchange medium in the battery heat exchange module 56, and improves the adaptability of the thermal management system 100.

[0102] In some embodiments, Figure 5 As shown, the battery heat exchange module 56 is provided with a curved flow channel, and the heat exchange medium flows in the curved flow channel.

[0103] In other embodiments, Figure 6 As shown, a straight pipe flow channel is provided on the battery heat exchange module 56, for example, the battery heat exchange module 56 is a harmonica tube heat exchanger.

[0104] In some specific embodiments, the battery heat exchange module 56 is a cold plate, which is attached to the battery to heat the battery.

[0105] The superheat is the difference between the actual temperature of a substance at a certain pressure and the saturation temperature. Only when the actual temperature is higher than the saturation temperature will liquid refrigerant not be sucked into the compressor 1 , thereby damaging the compressor 1 .

[0106] Specifically, the opening degree of the throttling element 15 needs to be adjusted according to PID (feedback-regulation strategy).

[0107] In some embodiments, in the preheating mode, adjusting the opening of the throttling element 15 according to the superheat of the heat exchange medium in the heat exchange branch 20 includes: superheat △T4<first set value △Ta, reducing the opening of the throttling element 15 and increasing the superheat; superheat △T4>second set value △Tb, increasing the opening of the throttling element 15 and reducing the superheat; superheat △Ta≤△T4≤△Tb, maintaining the opening of the throttling element 15, reducing the probability of liquid heat exchange medium entering the compressor 1.

[0108] For example, when ΔTa is 0°C, ΔTb is 5°C, and the superheat ΔT4 is between 0 and 5°C, the opening of the throttling element 15 is maintained.

[0109] Specifically, the thermal management system 100 further includes: a temperature and pressure sensor, which is disposed at the air inlet of the compressor 1 to obtain ΔT4, thereby further reducing the probability of liquid heat exchange medium entering the compressor 1.

[0110] In some embodiments, the throttling element 15 has an initial opening, which is a dynamically changing value and is related to the coolant temperature in the coolant subsystem 60 described below. The coolant temperature of the coolant subsystem 60 is judged before opening the valve. The higher the coolant temperature, the larger the initial opening, and the lower the coolant temperature, the smaller the initial opening.

[0111] More specifically, before using ΔT4, the throttling element 15 operates at the initial opening for τ1 min, where τ1 is the set time.

[0112] In some embodiments, the plurality of heat exchange branches 20 include a bottom heat exchange branch 20 and a top heat exchange branch 20, the top heat exchange branch 20 is located at the top of the battery and the bottom heat exchange branch 20 is located at the bottom of the battery; in the preheating mode, the temperature difference ΔT between the inlet end 40 and the outlet end 30 of the bottom heat exchange branch 20 is controlled to be less than a second threshold. By setting the temperature difference ΔT between the inlet end 40 and the outlet end 30 of the bottom heat exchange branch 20 to be less than the second threshold, the battery's own gravity is used to amplify the heating effect of the preheating mode.

[0113] Specifically, the bottom heat exchange branch 20 is located at the bottom of the battery. The battery's own gravity makes the bottom heat exchange branch 20 fit closely to the battery. The preheating mode uses the bottom heat exchange branch 20 to heat the battery to improve the heating effect.

[0114] In some embodiments, the thermal management system 100 further includes a coolant subsystem 60, and the control method further includes:

[0115] S40: When the waste heat recovery instruction is obtained, the coolant subsystem 60 performs heat exchange with the battery subsystem 80 to recover the waste heat of the coolant subsystem 60 and improve energy utilization.

[0116] Specifically, the battery subsystem 80 includes: an in-vehicle evaporator 7 , which is arranged between the commutation branch and the compressor 1 .

[0117] Specifically, the coolant subsystem 60 includes: a water pump 14, a power assembly 13, and a radiator 10. The water pump 14 drives the coolant to flow through the power assembly 13 and dissipate heat from the power assembly 13. When the heat of the power assembly 13 needs to be dissipated to the external environment, the coolant is controlled to flow through the power assembly 13 and the radiator 10, and the heat is dissipated by the radiator 10 that exchanges heat with the external environment.

[0118] More specifically, the thermal management system 100 includes: a first heat exchanger 4, the first heat exchanger 4 includes a first refrigerant flow channel and a first coolant flow channel that exchange heat with each other, the first refrigerant flow channel is a part of the battery subsystem 80, and the first coolant flow channel is a part of the coolant subsystem 60, so that the waste heat recovery of the coolant subsystem 60 can be achieved through the first refrigerant flow channel and the first coolant flow channel that exchange heat with each other.

[0119] In some embodiments, the thermal management system 100 has a normal heating mode. In the normal heating mode, each heat exchange branch 20 is controlled to heat the battery. When the water temperature of the coolant subsystem 60 reaches a third set temperature, the thermal management system 100 enters the normal heating mode.

[0120] Specifically, the third set temperature is greater than 0° C. to fully recover the waste heat.

[0121] In some embodiments, when the battery is charging and the temperature of the battery cells is less than TA, the battery management system (BMS) sends a battery heating signal.

[0122] Specifically, TA is a preset value.

[0123] In some embodiments, when the battery is discharging and the battery temperature is less than TB, the BMS sends a battery heating command, where TB is a dynamically changing value related to the remaining power (SOC). The larger the SOC, the smaller the TB value, and the smaller the SOC, the larger the TB value.

[0124] like Figure 2 As shown, the thermal management system 100 according to the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0125] The thermal management system 100 includes: a compressor 1, an in-vehicle condenser 2, an out-vehicle condenser 3, a first heat exchanger 4, a battery upper cold plate 5, a battery lower cold plate 6, an in-vehicle evaporator 7, a gas-liquid separator 8, a radiator 10, a liquid storage tank 11, a four-way water valve 12, a power assembly 13, a water pump 14, a first electronic expansion valve 151, a second electronic expansion valve 152, a third electronic expansion valve 153, a fourth electronic expansion valve 154, a first large-caliber electronic expansion valve 161, a second large-caliber electronic expansion valve 162, a first solenoid valve 171, a second solenoid valve 172, a third solenoid valve 173, a fourth solenoid valve 174, a first check valve 181, a second check valve 182, a fourth check valve 184, a first temperature and pressure integrated sensor PT1, a second temperature and pressure integrated sensor PT2, a third temperature and pressure integrated sensor PT3, a fourth temperature and pressure integrated sensor PT4, a second temperature sensor T2, a third temperature sensor T3, and a fourth temperature sensor T4.

[0126] Among them, the battery upper cold plate 5 and the battery lower cold plate 6 are the aforementioned battery heat exchange module 56, the first electronic expansion valve 151 and the second electronic expansion valve 152 are the aforementioned throttling element 15, the first large-diameter electronic expansion valve 161 and the second large-diameter electronic expansion valve 162 are the aforementioned flow regulating valve 16, and the fourth temperature and pressure integrated sensor PT4 is the aforementioned temperature and pressure sensor.

[0127] When the thermal management system enters the preheating mode, the second solenoid valve 172, the third solenoid valve 173, the first electronic expansion valve 151, the first large-diameter electronic expansion valve 161, the second electronic expansion valve 152, and the fourth electronic expansion valve 154 are closed, and the first solenoid valve 171, the fourth solenoid valve 174, the second large-diameter electronic expansion valve 162, and the third electronic expansion valve 153 are opened.

[0128] The heat exchange medium flow path in the preheating mode is: compressor 1 → first solenoid valve 171 → second large-diameter electronic expansion valve 162 → battery lower cold plate 6 → third electronic expansion valve 153 → first check valve 181 → first heat exchanger 4 → fourth solenoid valve 174 → gas-liquid separator 8 → compressor 1.

[0129] When the thermal management system enters the normal heating mode, the second solenoid valve 172, the third solenoid valve 173, the first electronic expansion valve 151, and the fourth electronic expansion valve 154 are closed, and the first solenoid valve 171, the fourth solenoid valve 174, the second large-diameter electronic expansion valve 162, the third electronic expansion valve 153, the first large-diameter electronic expansion valve 161, and the second electronic expansion valve 152 are opened.

[0130] The heat exchange medium flow path in the normal heating mode is: compressor 1→first solenoid valve 171→[(second large-diameter electronic expansion valve 162→battery lower cold plate 6→third electronic expansion valve 153) or (first large-diameter electronic expansion valve 161→battery upper cold plate 5→second electronic expansion valve 152)]→first check valve 181→first heat exchanger 4→fourth solenoid valve 174→gas-liquid separator 8→compressor 1.

[0131] The control method in the present invention ① closes the second electronic expansion valve 152 during the battery heating stage to increase the outlet pressure of the compressor 11, increase the temperature and pressure of the cold plate 6 under the battery, and avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1; the control method can increase the outlet pressure of the compressor 1, increase the power consumption of the compressor 1, increase the outlet temperature of the compressor 1, increase the heating inlet temperature of the cold plate 6 under the battery, increase the heat exchange temperature difference between the cold plate and the battery cell, and increase the heating rate of the battery cell. ② The normal heating mode at the end of battery heating opens the second electronic expansion valve 152 and the first large-caliber electronic expansion valve 161, and opens the upper and lower cold plates on the battery plate to heat the battery, which can maintain the consistency of the temperature inside the battery cell, keep the battery cell in a good state, extend the service life of the battery cell, and reduce battery failures.

[0132] The thermal management system according to the embodiment of the present invention includes: a compressor 1, a heat exchange branch 21, a first heat exchanger 4 and a control module.

[0133] The compressor 1 has an air inlet and an air outlet.

[0134] There is at least one heat exchange branch 21, and the heat exchange branch 21 performs heat exchange with the battery. The thermal management system 100 has a battery heating mode. In the battery heating mode, the first end of the heat exchange branch 21 is connected to the exhaust port.

[0135] The first end of the first heat exchanger 4 is connected to the second end of the heat exchange branch through the throttling element 15, and the second end of the first heat exchanger is connected to the air inlet.

[0136] The control module is configured to execute the above-mentioned control method of the thermal management system.

[0137] Among them, the thermal management system has a battery heating mode, and the battery heating mode includes a preheating heating mode and a normal heating mode.

[0138] According to the thermal management system of the embodiment of the present invention, the above-mentioned control method is executed, so as to avoid excessive pressure difference between the inlet and outlet ends of the heat exchange branch, and then the pressure difference between the air inlet and the air outlet of the compressor can be made smaller, which can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect of the battery being affected by the low temperature of the heat exchange medium, thereby reducing the probability of compressor damage.

[0139] The vehicle according to the embodiment of the present invention includes a thermal management system 100 and a control module, and the control module is configured to execute the control method of the thermal management system.

[0140] According to the vehicle of the embodiment of the present invention, a control module is set to execute the control method of the thermal management system, so that the temperature of the heat exchange medium at the outlet end 30 in at least one heat exchange branch 20 is greater than or equal to the first threshold value T1, and the heat exchange medium at the outlet end 30 is controlled to remain in a certain state, thereby reducing the probability of excessive liquefaction of the heat exchange medium and reducing the probability of damage to the compressor.

[0141] According to the storage medium of the embodiment of the present invention, the storage medium is configured to execute the control method of the thermal management system described above.

[0142] According to the storage medium of an embodiment of the present invention, by executing the control method of the above-mentioned thermal management system, the temperature of the heat exchange medium at the outlet end 30 in at least one heat exchange branch 20 is greater than or equal to the first threshold value T1, and the heat exchange medium at the outlet end 30 is controlled to remain in a certain state, thereby reducing the probability of excessive liquefaction of the heat exchange medium and reducing the probability of damage to the compressor.

[0143] A storage device according to an embodiment of the present invention includes the above-mentioned storage medium.

[0144] According to the storage device of the embodiment of the present invention, by applying the above-mentioned storage medium, the temperature of the heat exchange medium at the outlet end 30 in at least one heat exchange branch 20 is greater than or equal to the first threshold value T1, and the heat exchange medium at the outlet end is controlled to remain in a certain state, thereby reducing the probability of excessive liquefaction of the heat exchange medium and reducing the probability of damage to the compressor.

[0145] According to the control method of the thermal management system of the embodiment of the present invention, the thermal management system 100 includes a battery subsystem 80, the battery subsystem 80 includes a plurality of heat exchange branches 20 arranged in parallel, the heat exchange branches 20 are used for heat exchange with the battery, and the plurality of heat exchange branches 20 arranged in parallel include a pressure regulating sub-branch 21, such as Figure 4 As shown, the control method includes:

[0146] S50: A battery heating signal is obtained.

[0147] S60 : The thermal management system 100 enters a preheating mode. In the preheating mode, the total flow rate Q1 of the pressure regulating sub-branch 21 is greater than the total flow rate Q2 of the remaining heat exchange branches 20 .

[0148] By setting the total flow rate Q1 of the heat exchange medium of the pressure regulating sub-branch 21 to be greater than the total flow rate Q2 of the other heat exchange branches 20, the heat exchange medium discharged from the compressor 1 is concentrated on the pressure regulating sub-branch 21, so that the heat exchange medium discharged from the compressor can enter the pressure regulating sub-branch 21 in sufficient quantity, thereby adjusting the pressure of the pressure regulating sub-branch 21 and reducing the probability of damage to the compressor 1.

[0149] When the battery temperature is low, the total flow rate Q1 of the pressure regulating sub-branch 21 is greater than the total flow rate Q2 of the remaining heat exchange branches 20, and the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, since the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient, when the battery heat exchange module and the battery are fully exchanged with heat, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meet the requirements of normal operation of the compressor, thereby avoiding the situation where the pressures at the exhaust and inlet of the compressor are lower than the normal operating values.

[0150] According to the control method of the thermal management system of an embodiment of the present invention, by setting the total flow rate Q1 of the pressure regulating sub-branch 21 to be greater than the total flow rate Q2 of the remaining heat exchange branches 20, the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, since the amount of heat exchange medium in the pressure regulating sub-branch is sufficient, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements for normal operation of the compressor, thereby avoiding the situation where the pressures at the exhaust and inlet of the compressor are lower than the normal operating values, thereby reducing the probability of damage to the compressor.

[0151] In some embodiments, a ratio Q1 / Q2 of a total flow rate Q1 of the pressure regulating sub-branch 21 to a total flow rate Q2 of the remaining heat exchange branches 20 is greater than a third threshold value.

[0152] Specifically, Q1 is the total flow rate of the heat exchange medium in the pressure regulating sub-branch 21, wherein there can be only one pressure regulating sub-branch 21, and Q1 is the flow rate of the heat exchange medium in one pressure regulating sub-branch 21; there can also be multiple pressure regulating sub-branch 21, and Q1 is the total flow rate of the heat exchange medium in multiple pressure regulating sub-branch 21.

[0153] Specifically, Q2 is the total flow rate of the heat exchange medium of the remaining heat exchange branches 20, wherein there may be one remaining heat exchange branch 20, and Q1 is the flow rate of the heat exchange medium of one remaining heat exchange branch 20; there may also be multiple remaining heat exchange branches 20, and Q1 is the total flow rate of the heat exchange medium of multiple remaining heat exchange branches 20.

[0154] Specifically, the third threshold is a pre-set value. It can be understood that the third threshold reflects the concentration degree of the heat exchange medium. The concentration degree of the heat exchange medium is controlled by changing the third threshold, and most of the heat exchange medium discharged from the compressor 1 is concentrated on the pressure regulating sub-branch 21, so that the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient. When the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements of the normal operation of the compressor, thereby avoiding the situation where the pressures at the exhaust and inlet of the compressor are lower than the normal operating values.

[0155] For example, the third threshold is 2, that is, the flow on the pressure regulating sub-branch 21 accounts for more than two-thirds of the total flow, further improving the concentration of the heat exchange medium, and concentrating most of the heat exchange medium discharged from the compressor 1 on the pressure regulating sub-branch 21, so that the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient. When the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements of the normal operation of the compressor, thereby avoiding the situation where the pressures at the exhaust and inlet of the compressor are lower than the normal operating values.

[0156] The above can be simply understood as follows: in the related art, the upper limit of the total flow rate of the refrigerant supplied by the compressor is a fixed value, and more heat exchange branches have a greater demand for refrigerant. Each heat exchange branch is allocated less refrigerant, resulting in sufficient heat exchange between the refrigerant in each heat exchange branch and the battery. When the battery temperature is low, the degree of liquefaction of the refrigerant in the battery heat exchange module 56 in each heat exchange branch is relatively large, thereby affecting the pressure at the air inlet and exhaust port of the compressor, and thus the normal operation of the compressor. In this application, by setting Q1 / Q2 to be greater than the third threshold value, the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, due to the sufficient amount of heat exchange medium in the pressure regulating sub-branch 21, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements for the normal operation of the compressor, thereby avoiding the situation where the pressure at the exhaust port and air inlet of the compressor is lower than the normal operating value.

[0157] In some embodiments, at least one heat exchange branch 20 includes a flow regulating valve 16, which controls the valve 1 opening of at least one heat exchange branch 20 to be greater than the valve 2 opening of the other heat exchange branches 20. In other words, the flow regulating valve 16 on at least one heat exchange branch 20 is greater than the flow regulating valve 16 on the other heat exchange branches 20, so that the heat exchange medium is concentrated on at least one heat exchange branch 20.

[0158] In some embodiments, in the preheating mode, the pressure regulating sub-branch 21 is in working state, and the remaining heat exchange branches 20 are controlled to be in non-working state. By controlling the remaining heat exchange branches 20 to be in non-working state, the heat exchange medium is further concentrated on the pressure regulating sub-branch 21, and the concentration is improved, so that the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, due to the sufficient amount of heat exchange medium in the pressure regulating sub-branch 21, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements of the normal operation of the compressor, thereby avoiding the situation where the pressure of the compressor exhaust port and the air inlet is lower than the normal operating value.

[0159] Specifically, the remaining heat exchange branches 20 are in a non-working state, and no heat exchange medium enters the remaining heat exchange branches 20, thereby concentrating the heat exchange medium discharged from the compressor 1 on the pressure regulating sub-branch 21, so that the heat exchange medium discharged from the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, since the amount of heat exchange medium in the pressure regulating sub-branch 21 is sufficient, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meets the requirements for the normal operation of the compressor, thereby avoiding the situation where the pressures at the exhaust and inlet of the compressor are lower than the normal operating values.

[0160] In some embodiments, when the temperature of the battery reaches the first temperature, the thermal management system 100 enters the normal heating mode. In the normal heating mode, at least one heat exchange branch 20 is controlled to be turned on according to the real-time temperature of the battery to heat the battery. In some embodiments, the flow rate of the pressure regulating sub-branch 21 in the preheating mode is greater than the flow rate of the pressure regulating sub-branch 21 in the normal heating mode. In other words, there is more heat exchange medium on the pressure regulating sub-branch 21 in the preheating mode, and the heat exchange medium is concentrated, so that the heat exchange medium discharged by the compressor 1 can enter the pressure regulating sub-branch 21 in sufficient quantity. In this way, even if the battery temperature is low, due to the sufficient amount of heat exchange medium in the pressure regulating sub-branch 21, when the battery heat exchange module 56 fully exchanges heat with the battery, the temperature and / or pressure of the heat exchange medium at the outlet of the pressure regulating sub-branch still meet the requirements of the normal operation of the compressor, thereby avoiding the situation where the pressure of the compressor exhaust port and the air inlet port are lower than the normal operating value.

[0161] In some embodiments, when the minimum value of the temperature values ​​at multiple locations of the battery reaches the first set temperature, the temperature of the battery reaches the first temperature. That is, when the temperature of the lowest temperature part of the battery is greater than the first set temperature, the thermal management system 100 enters the normal heating mode. Taking the temperature of the lowest temperature part of the battery as the standard, the occurrence of uneven heating of the battery is further avoided. The first set temperature can be set according to the heat exchange capacity of the battery. For example, when the first temperature is reached, the target temperature of the battery is 30°C. At this time, according to the normal heating mode, according to the target temperature of the battery, multiple heat exchange branches are controlled to heat the battery without causing the pressure of the compressor inlet and exhaust port to be lower than its normal operating value.

[0162] For example, the first set temperature is 5° C., and the temperature of the lowest temperature part of the battery is greater than 5° C., and the thermal management system 100 enters the normal heating mode.

[0163] In some embodiments, the heat exchange branch 20 includes a battery heat exchange module 56 and a throttling element 15 connected in series, and the opening of the throttling element 15 is adjusted according to the superheat of the heat exchange medium in the heat exchange branch 20. The throttling element 15 adjusts the opening according to the superheat, adjusts the heat exchange medium in the battery heat exchange module 56, and improves the adaptability of the thermal management system 100.

[0164] Specifically, the battery heat exchange module 56 is a cold plate, which is attached to the battery to heat the battery.

[0165] The superheat is the difference between the actual temperature of a substance at a certain pressure and the saturation temperature. Only when the actual temperature is higher than the saturation temperature will liquid refrigerant not be sucked into the compressor 1 , thereby damaging the compressor 1 .

[0166] In some embodiments, in the preheating mode, adjusting the opening of the throttling element 15 according to the superheat of the heat exchange medium in the heat exchange branch 20 includes:

[0167] When the superheat △T4 is less than the first set value △Ta, the opening of the throttling element 15 is reduced to increase the superheat; when the superheat △T4 is greater than the second set value △Tb, the opening of the throttling element 15 is increased to reduce the superheat; when the superheat △Ta≤△T4≤△Tb, the opening of the throttling element 15 is maintained to reduce the probability of the liquid heat exchange medium entering the compressor 1.

[0168] For example, when ΔTa is 0°C, ΔTb is 5°C, and the superheat ΔT4 is between 0 and 5°C, the opening of the throttling element 15 is maintained.

[0169] Specifically, the thermal management system 100 further includes: a temperature and pressure sensor, which is disposed at the air inlet of the compressor 1 to obtain ΔT4, thereby further reducing the probability of liquid heat exchange medium entering the compressor 1.

[0170] In some embodiments, the throttling element 15 has an initial opening, which is a dynamically changing value and is related to the coolant temperature in the coolant subsystem 60 described below. The coolant temperature of the coolant subsystem 60 is judged before opening the valve. The higher the coolant temperature, the larger the initial opening, and the lower the coolant temperature, the smaller the initial opening.

[0171] More specifically, before using ΔT4, the throttling element 15 operates at the initial opening for τ1 min, where τ1 is the set time.

[0172] In some embodiments, the plurality of heat exchange branches 20 include a bottom heat exchange branch 20 and a top heat exchange branch 20, the top heat exchange branch 20 is located at the top of the battery and the bottom heat exchange branch 20 is located at the bottom of the battery; in the preheating mode, the total flow Q1 of the bottom heat exchange branch 20 is controlled to be greater than the total flow Q2 of the top heat exchange branch 20. The total flow Q1 of the bottom heat exchange branch 20 is greater than the total flow Q2 of the top heat exchange branch 20, and the heating effect of the preheating mode is amplified by the gravity of the battery itself.

[0173] Specifically, the bottom heat exchange branch 20 is located at the bottom of the battery. The battery's own gravity makes the bottom heat exchange branch 20 fit closely to the battery. The preheating mode uses the bottom heat exchange branch 20 to heat the battery to improve the heating effect.

[0174] In some embodiments, the thermal management system 100 further includes a coolant subsystem 60; and the control method further includes:

[0175] S70: When the waste heat recovery instruction is obtained, the coolant subsystem 60 performs heat exchange with the battery subsystem 80 to recover the waste heat of the coolant subsystem 60 and improve energy utilization.

[0176] Specifically, the battery subsystem 80 includes: an in-vehicle evaporator 7 , which is arranged between the commutation branch and the compressor 1 .

[0177] Specifically, the coolant subsystem 60 includes: a water pump 14 , a powertrain 13 , and a radiator 10 . The water pump 14 drives the coolant to flow through the powertrain 13 and the radiator 10 .

[0178] More specifically, the thermal management system 100 includes a first heat exchanger 4 , which is disposed between the battery subsystem 80 and the coolant subsystem 60 to perform heat exchange.

[0179] The first heat exchanger may be a plate heat exchanger or a tube heat exchanger.

[0180] In some embodiments, when the water temperature of the coolant subsystem 60 reaches the third set temperature, the thermal management system 100 enters the normal heating mode.

[0181] Specifically, the third set temperature is greater than 0° C. to fully recover the waste heat.

[0182] In some embodiments, when the battery is charging and the temperature of the battery cells is less than TA, the battery management system (BMS) sends a battery heating signal.

[0183] Specifically, TA is a preset value.

[0184] In some embodiments, when the battery is discharging and the battery temperature is less than TB, the BMS sends a battery heating command, where TB is a dynamically changing value related to the remaining power (SOC). The larger the SOC, the smaller the TB value, and the smaller the SOC, the larger the TB value.

[0185] The thermal management system 100 according to the embodiment of the present invention includes: a compressor 1, a heat exchange branch 20, a first heat exchanger 56 and a control module.

[0186] The compressor 1 has an air inlet and an air outlet.

[0187] Multiple heat exchange branches 20 are arranged in parallel, and the heat exchange branches 20 perform heat exchange with the battery. The thermal management system has a battery heating mode. In the battery heating mode, the first end of each heat exchange branch is connected to the air inlet. The multiple heat exchange branches 20 arranged in parallel include a pressure regulating sub-branch 21.

[0188] The first end of the first heat exchanger 4 is connected to the second end of each heat exchange branch through a throttling element 15, and the second end of the first heat exchanger is connected to the air inlet.

[0189] The control module is configured to execute the above-mentioned control method of the thermal management system.

[0190] The thermal management system 100 has a battery heating mode, and the battery heating mode includes a preheating heating mode and a normal heating mode.

[0191] According to the thermal management system of an embodiment of the present invention, by applying the control method of the above-mentioned thermal management system, it is possible to avoid excessive pressure difference between the inlet and outlet ends of the heat exchange branch, thereby making the pressure difference between the air inlet and the air outlet of the compressor smaller, which can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect of the battery being affected by the low temperature of the heat exchange medium, thereby reducing the probability of damage to the compressor.

[0192] According to the control method of the thermal management system of the embodiment of the present invention, the thermal management system includes a battery subsystem 80, the battery subsystem 80 includes at least one heat exchange branch 20, and the heat exchange branch 20 is used for heat exchange with the battery. The control method includes:

[0193] S21: A battery heating signal is obtained.

[0194] S22: The thermal management system enters a preheating mode. In the preheating mode, the flow rate of at least one heat exchange branch is greater than its flow rate in the normal heating mode. The thermal management mode includes a preheating mode and a normal heating mode.

[0195] According to the control method of the thermal management system of an embodiment of the present invention, by increasing the flow rate of at least one heat exchange branch, it is possible to avoid an excessively large pressure difference between the inlet and outlet ends of the heat exchange branch, thereby making the pressure difference between the air inlet and the air outlet of the compressor smaller. This can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect on the battery due to the low temperature of the heat exchange medium, thereby reducing the probability of damage to the compressor.

[0196] In some embodiments, the thermal management system includes a battery subsystem 80, which includes a plurality of heat exchange branches 20 arranged in parallel. By arranging a plurality of heat exchange branches in parallel, the flow rate of at least one of the heat exchange branches is increased, thereby reducing the probability of compressor damage.

[0197] According to the thermal management system of an embodiment of the present invention, the thermal management system 100 includes a battery subsystem 80, the battery subsystem 80 includes a plurality of heat exchange branches 20, the heat exchange branches 20 are used for heat exchange with the battery, each heat exchange branch 20 includes a battery heat exchange module 56, and the plurality of heat exchange branches 20 include a pressure regulating sub-branch 21, and the flow resistance of the battery heat exchange module 56 in the pressure regulating sub-branch 21 is smaller than the flow resistance of the battery heat exchange modules 56 in the remaining branches.

[0198] It should also be explained that the thermal management system 100 includes a compressor 1, the exhaust port of the compressor 1 can be connected to the heat exchange branch 20 to discharge the high-temperature gaseous heat exchange medium to the heat exchange branch 20, and the heat exchange medium that has exchanged heat with the battery in the heat exchange branch 20 can be discharged from the outlet port 30 to the air inlet of the compressor 1.

[0199] According to the thermal management system of an embodiment of the present invention, by setting the flow resistance of the battery heat exchange module 56 in the pressure regulating sub-branch 21 to be smaller than the flow resistance of the battery heat exchange module 56 in the other branches, the flow rate of the pressure regulating sub-branch 21 is increased, thereby avoiding excessive pressure difference between the inlet and outlet ends of the heat exchange branch, and further reducing the pressure difference between the air inlet and outlet of the compressor. This can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect of the battery being affected by the low temperature of the heat exchange medium, thereby reducing the probability of compressor damage.

[0200] In some embodiments, a plurality of heat exchange branches are arranged in parallel.

[0201] In some embodiments, the pressure regulating sub-branch 21 is arranged on one side of the battery, and the remaining heat exchange branches are arranged on the other side of the battery, thereby improving the temperature uniformity of the battery.

[0202] According to the control method of the thermal management system of an embodiment of the present invention, the thermal management system includes a battery subsystem 80, the battery subsystem 80 includes a plurality of heat exchange branches 20, the heat exchange branches 20 are used for heat exchange with the battery, each heat exchange branch 20 includes a battery heat exchange module 56, and the plurality of heat exchange branches 20 include a pressure regulating sub-branch 21, and the flow resistance of the battery heat exchange module 56 in the pressure regulating sub-branch 21 is smaller than the flow resistance of the battery heat exchange modules 56 in the remaining branches.

[0203] It should also be explained that the thermal management system 100 includes a compressor 1, the exhaust port of the compressor 1 can be connected to the heat exchange branch 20 to discharge the high-temperature gaseous heat exchange medium to the heat exchange branch 20, and the heat exchange medium that has exchanged heat with the battery in the heat exchange branch 20 can be discharged from the outlet port 30 to the air inlet of the compressor 1.

[0204] Control methods include:

[0205] S31: A battery heating signal is obtained.

[0206] S32: The thermal management system enters a preheating mode. In the preheating mode, the pressure regulating sub-branch 21 exchanges heat with the battery.

[0207] According to the control method of the thermal management system of an embodiment of the present invention, by setting the flow resistance of the battery heat exchange module 56 in the pressure regulating sub-branch 21 to be smaller than the flow resistance of the battery heat exchange module 56 in the other branches, the flow rate of the pressure regulating sub-branch 21 is increased, and the above-mentioned control method is executed, so as to avoid excessive pressure difference between the inlet and outlet ends of the heat exchange branch, and thus make the pressure difference between the air inlet and the air outlet of the compressor smaller, which can not only avoid the compressor 1 from exceeding the operating range and causing damage to the compressor 1, but also avoid the heating effect of the battery being affected by the low temperature of the heat exchange medium, thereby reducing the probability of compressor damage.

[0208] The vehicle according to the embodiment of the present invention includes a thermal management system 100 and a control module, and the control module is configured to execute the control method of the thermal management system.

[0209] According to the vehicle of the embodiment of the present invention, by setting a control module to execute the control method of the thermal management system, the probability of excessive liquefaction of the heat exchange medium is reduced, and the probability of damage to the compressor is reduced.

[0210] According to the storage medium of the embodiment of the present invention, the storage medium is configured to execute the control method of the thermal management system described above.

[0211] The storage medium according to the embodiment of the present invention reduces the probability of excessive liquefaction of the heat exchange medium and reduces the probability of damage to the compressor by executing the control method of the thermal management system described above.

[0212] A storage device according to an embodiment of the present invention includes the above-mentioned storage medium.

[0213] The storage device according to the embodiment of the present invention reduces the probability of excessive liquefaction of the heat exchange medium and reduces the probability of damage to the compressor by applying the above storage medium.

[0214] Other operations of the control method of the thermal management system according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0215] In the description of the present invention, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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.

[0216] In addition, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0217] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0218] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0219] In the description of this specification, the description with reference to the terms "embodiment", "example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0220] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for a thermal management system, characterized in that: The thermal management system comprises a battery subsystem (80), the battery subsystem (80) comprises at least one heat exchange branch (20), the heat exchange branch (20) is used for heat exchange with the battery, and the control method comprises: The battery heating signal is obtained; The thermal management system enters a preheating mode, in which the temperature of the heat exchange medium at the outlet end (30) of at least one of the heat exchange branches (20) is greater than or equal to a first threshold value T1.

2. The control method of the thermal management system according to claim 1, characterized in that: The temperature difference between the heat exchange medium at the inlet end (40) and the outlet end (30) in at least one of the heat exchange branches (20) is ΔT≦T2, where T2 is a second threshold value.

3. The control method of the thermal management system according to claim 1, characterized in that: When the temperature of the battery reaches a first temperature, the thermal management system enters a normal heating mode. In the normal heating mode, at least one of the heat exchange branches (20) is controlled to be turned on according to the real-time temperature of the battery to heat the battery.

4. The control method of the thermal management system according to claim 3, characterized in that: The battery subsystem (80) comprises a plurality of heat exchange branches (20) connected in parallel, the plurality of heat exchange branches (20) being used for heat exchange with the battery, the plurality of heat exchange branches (20) comprising a pressure regulating sub-branch (21), In the preheating mode, the temperature of the heat exchange medium at the outlet end (30) of the pressure regulating sub-branch (21) is controlled to be greater than or equal to a first threshold value T1.

5. The control method of the thermal management system according to claim 4, characterized in that: In the preheating mode, the temperature difference between the inlet end (40) and the outlet end (30) in the pressure regulating sub-branch (21) is controlled to be ΔT≦T2.

6. The control method of the thermal management system according to claim 4, characterized in that: At least one heat exchange branch (20) is used for exchanging heat with a first side of the battery, and at least one heat exchange branch (20) is used for exchanging heat with a second side of the battery.

7. The control method of the thermal management system according to claim 4, characterized in that: The plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch. In the preheating mode, the total flow Q1 in the pressure regulating sub-branch (21) is greater than the total flow Q2 in the heat exchange sub-branch (20).

8. The control method of the thermal management system according to claim 7, characterized in that: In the preheating mode, a ratio Q1 / Q2 of a total flow rate Q1 of the heat exchange medium in the pressure regulating sub-branch (21) to a total flow rate Q2 of the heat exchange sub-branch (20) is greater than a third threshold value.

9. The control method of the thermal management system according to claim 4, characterized in that: The plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch, and at least a portion of the heat exchange branches (20) include a flow regulating valve (16) that controls the valve opening in the pressure regulating sub-branch (21) to be greater than the valve opening of the heat exchange sub-branch.

10. The control method of the thermal management system according to claim 4, characterized in that: The plurality of heat exchange branches include a pressure regulating sub-branch and a heat exchange sub-branch. In the preheating mode, the heat exchange sub-branch (20) is controlled to be in a non-working state.

11. The control method of the thermal management system according to claim 3, characterized in that: When the minimum value among the temperature values ​​at the plurality of positions of the battery reaches the first set temperature, the temperature of the battery reaches the first temperature.

12. The control method of a thermal management system according to claim 1, characterized in that: The thermal management system (100) further includes a normal heating mode, the heat exchange branch (20) includes a pressure regulating sub-branch (21), and the flow rate of the pressure regulating sub-branch (21) in the pre-heating mode is greater than the flow rate of the pressure regulating sub-branch (21) in the normal heating mode.

13. The control method of a thermal management system according to claim 1, characterized in that: The heat exchange branch (20) comprises a battery heat exchange module (56) and a throttling element (15) connected in series, and the opening of the throttling element (15) is adjusted according to the superheat of the heat exchange medium in the heat exchange branch (20).

14. The control method of the thermal management system according to claim 13, characterized in that: In the preheating mode, adjusting the opening of the throttling element (15) according to the superheat of the heat exchange medium in the heat exchange branch (20) comprises: The superheat ΔT4 is less than the first set value ΔTa, and the opening of the throttling element (15) is reduced; The superheat ΔT4> the second set value ΔTb, increasing the opening of the throttling element (15); The superheat ΔTa≤ΔT4≤ΔTb maintains the opening of the throttling element (15).

15. The control method of a thermal management system according to claim 2, characterized in that: The plurality of heat exchange branches (20) include a bottom heat exchange branch and a top heat exchange branch, wherein the top heat exchange branch is located at the top of the battery and the bottom heat exchange branch is located at the bottom of the battery; In the preheating mode, the temperature difference ΔT between the inlet and outlet ends of the bottom heat exchange branch is controlled to be smaller than a second threshold.

16. The control method of a thermal management system according to any one of claims 1 to 15, characterized in that: The thermal management system (100) further includes a cooling liquid subsystem (60); The control method further comprises: When a waste heat recovery instruction is obtained, the coolant subsystem (60) performs heat exchange with the battery subsystem (80).

17. The control method of the thermal management system according to claim 16, characterized in that: The thermal management system (100) has a normal heating mode, in which each of the heat exchange branches (20) is controlled to heat the battery; When the water temperature of the coolant subsystem (60) reaches a third set temperature, the thermal management system (100) enters the normal heating mode.

18. A thermal management system, characterized in that: include: A compressor (1), the compressor (1) having an air inlet and an air outlet; at least one heat exchange branch (20), the heat exchange branch (20) performing heat exchange with a battery, the thermal management system (100) having a battery heating mode, in which a first end of the heat exchange branch (20) is in communication with the exhaust port; A first heat exchanger (4), wherein a first end of the first heat exchanger (4) is connected to a second end of the heat exchange branch (20) via a throttling element (15), and a second end of the first heat exchanger (4) is connected to the air inlet; A control module, wherein the control module is configured to execute the control method of the thermal management system according to any one of claims 1 to 17.

19. A vehicle, characterized in that: The invention comprises a thermal management system (100) and a control module, wherein the control module is configured to execute the control method of the thermal management system according to any one of claims 1 to 17.

20. A storage medium, characterized in that: The storage medium is configured to execute the control method of the thermal management system according to any one of claims 1 to 17.

21. A storage device, characterized in that: Comprising the storage medium of claim 20.

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