CN116278721B

CN116278721B - Thermal management system, method, apparatus, and storage medium

Info

Publication number: CN116278721B
Application number: CN202310594623.5A
Authority: CN
Inventors: 及非凡; 时军
Original assignee: Zhejiang Zero Run Technology Co Ltd; Zhejiang Lingsheng Power Technology Co Ltd
Current assignee: Zhejiang Zero Run Technology Co Ltd; Zhejiang Lingsheng Power Technology Co Ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-09-01
Anticipated expiration: 2043-05-22
Also published as: CN116278721A

Abstract

The invention discloses a thermal management system, a method, a device and a storage medium, wherein the thermal management system comprises: the first cooling loop is used for cooling a motor controller in the electric drive system; the second cooling loop is used for cooling an electric drive transmission assembly in the electric drive system; wherein the first cooling circuit and the second cooling circuit are independent of each other. Through the mode, the motor controller and the electric drive assembly are cooled respectively and independently by adopting different cooling loops, the working performance requirements of the motor controller and the electric drive assembly can be considered, and the cooling effect of the thermal management system on the electric drive system is optimized.

Description

Thermal management system, method, apparatus, and storage medium

Technical Field

The present invention relates to the field of automotive management technologies, and in particular, to a thermal management system, a thermal management method, a thermal management device, and a storage medium.

Background

Hybrid electric vehicles or pure electric vehicles typically include an electric drive system that includes a motor controller and key components such as an electric drive transmission assembly (including a motor and a decelerator). During the driving process of the automobile, the thermal management system of the automobile generally cools the electric drive system under a high temperature condition so as to enable the electric drive system to work in a proper temperature range.

The electric drive system is an important power mechanism in the automobile, and directly influences the service life of the automobile and the driving safety of a driver. Therefore, how to optimize the cooling effect of the thermal management system on the electric drive system is a technical problem to be solved.

Disclosure of Invention

The application mainly solves the technical problem of providing a thermal management system, a method, equipment and a computer readable storage medium, which can meet the working performance requirements of a motor controller and an electric drive assembly and optimize the cooling effect of the thermal management system on the electric drive system.

In order to solve the technical problems, the application adopts a technical scheme that: there is provided a thermal management system for an electric drive system of an automobile, the thermal management system comprising: the first cooling loop is used for cooling a motor controller in the electric drive system; the second cooling loop is used for cooling an electric drive transmission assembly in the electric drive system; wherein the first cooling circuit and the second cooling circuit are independent of each other.

The heat management system further comprises a third cooling loop, the third cooling loop comprises a heat exchange device, a refrigerant side and a cooling liquid side of the heat exchange device are respectively located in the third cooling loop and the first cooling loop, and the refrigerant flowing through the refrigerant side is used for cooling liquid flowing through the cooling liquid side.

The first cooling loop comprises a motor controller, a first electronic water pump, a battery and a heat exchange device, wherein the motor controller, the first electronic water pump, the battery and the cooling liquid side of the heat exchange device are connected in series through pipelines.

The first cooling loop comprises a motor controller, a second electronic water pump and a heat exchange device, and the motor controller, the second electronic water pump and the cooling liquid side of the heat exchange device are connected in series through pipelines.

The first cooling loop comprises a first branch and a second branch, the first branch comprises a third electronic water pump and a heat exchange device, the third electronic water pump and the cooling liquid side of the heat exchange device are connected in series through a pipeline, the second branch comprises a motor controller and a first valve which are connected in series through a pipeline, and two ends of the second branch are respectively connected with two ends of the first branch; the thermal management system further comprises a battery cooling loop, the battery cooling loop comprises a first branch and a third branch, the third branch comprises a battery and a second valve which are connected in series through a pipeline, and two ends of the first branch are respectively connected with two ends of the third branch.

The first cooling loop comprises a fourth branch, a fifth branch and a sixth branch; the fourth branch comprises a fourth electronic water pump, a third valve and a heat exchange device, the cooling liquid sides of the fourth electronic water pump, the third valve and the heat exchange device are connected in series through pipelines, the fifth branch comprises a motor controller and a fourth valve which are connected in series through pipelines, the sixth branch comprises a fifth electronic water pump, a battery and a fifth valve which are connected in series through pipelines, two ends of the fifth branch are respectively connected with two ends of the fourth branch, and the fifth branch is connected with the sixth branch in parallel; in the case that the third valve and the fourth valve are both configured in a conducting state, the cooling liquid side of the heat exchange device, the fourth electronic water pump, the third valve, the fourth valve and the motor controller form a first sub-cooling loop; in the case where the third valve is configured in an off state, the fourth valve and the fifth valve are configured in an on state, the fifth electronic water pump, the fourth valve, the fifth valve, the motor controller and the battery form a second sub-cooling circuit.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a thermal management method comprising: detecting whether a cooling requirement exists on the electric drive system; controlling a first cooling circuit in the thermal management system to cool the motor controller in response to determining that the motor controller in the electric drive system has a cooling demand; in response to determining that a cooling demand exists for an electric drive assembly in the electric drive system, a second cooling circuit in the thermal management system is controlled to cool the electric drive assembly.

Wherein the thermal management system comprises a plurality of modes of operation, the method further comprising: determining a target working mode of the thermal management system, wherein the target working mode is one of a plurality of working modes; detecting whether a cooling requirement exists for the electric drive system includes: and judging whether the target device has a cooling requirement or not based on the target working mode and the temperature of the cooling liquid flowing through the target device, wherein the target device is a motor controller or an electric drive assembly.

Wherein, under the condition that the target device is the motor controller, judge whether the target device has the cooling demand based on target operating mode and the temperature of the coolant flowing through the target device, include: selecting a temperature threshold corresponding to a target working mode from the first corresponding relation as a first target temperature threshold, wherein the first corresponding relation comprises temperature thresholds corresponding to a plurality of working modes respectively; determining whether a cooling demand exists for the motor controller based on the first target temperature threshold and a temperature of the coolant flowing through the motor controller; and/or, in the case where the target device is an electric drive assembly, determining whether a cooling requirement exists for the target device based on the target operating mode and a temperature of the coolant flowing through the target device, including: selecting a temperature threshold corresponding to the target working mode from the second corresponding relation as a second target temperature threshold, wherein the second corresponding relation comprises temperature thresholds corresponding to a plurality of working modes respectively, and the temperature thresholds corresponding to the same working mode in the first corresponding relation and the second corresponding relation are different; based on the second target temperature threshold and the temperature of the cooling fluid flowing through the electric drive assembly, it is determined whether a cooling demand exists for the electric drive assembly.

The plurality of working modes comprise an energy-saving mode, a common mode and a motion mode, wherein the temperature threshold value corresponding to the energy-saving mode is larger than the temperature threshold value corresponding to the common mode, and the temperature threshold value corresponding to the common mode is larger than the temperature threshold value corresponding to the motion mode.

Wherein, including target electronic water pump in the first cooling circuit, under the condition that there is the cooling demand in the motor controller, the method still includes: detecting a torque output demand of the vehicle; controlling an operating gear of the target electronic water pump based on the torque output demand; the torque output requirement is positively correlated with the rotation speed of the water pump under the running gear of the target electronic water pump.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a thermal management method comprising: detecting whether a battery and a motor controller have cooling requirements; controlling the first electronic water pump and the heat exchange device to operate in response to the simultaneous cooling requirement of the battery and the motor controller; and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the first electronic water pump to operate and the heat exchange device to be closed.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a thermal management method comprising: detecting whether a motor controller has a cooling requirement; and controlling the second electronic water pump and the heat exchange device to operate in response to the cooling requirement of the motor controller.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a thermal management method comprising: detecting whether a battery and a motor controller have cooling requirements; responding to the simultaneous cooling requirement of the battery and the motor controller, controlling the first valve and the second valve to be in a conducting state, and controlling the third electronic water pump and the heat exchange device to operate; and in response to the fact that the battery does not have a cooling requirement and the motor controller has a cooling requirement, controlling the first valve to be in a conducting state, the second valve to be in a cut-off state and controlling the third electronic water pump and the heat exchange device to operate.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a thermal management method comprising: detecting whether a battery and a motor controller have cooling requirements; responding to the simultaneous cooling requirement of the battery and the motor controller, controlling the third valve, the fourth valve and the fifth valve to be in a conducting state simultaneously, and controlling the fourth electronic water pump, the fifth electronic water pump and the heat exchange device to operate; and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the third valve to be in a cut-off state, controlling the fourth valve and the fifth valve to be in a conduction state, and controlling the fourth electronic water pump and the heat exchange device to be closed and controlling the fifth electronic water pump to operate.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided an electronic device comprising a memory and a processor coupled to each other, the memory storing program instructions; the processor is configured to execute the program instructions stored in the memory to implement the thermal management method described above.

In order to solve the technical problems, the application adopts another technical scheme that: there is provided a computer readable storage medium for storing program instructions executable by a processor to implement the above-described thermal management method.

According to the scheme, the thermal management system comprises a first cooling loop and a second cooling loop which are independent from each other, wherein the first cooling loop is used for cooling a motor controller in the electric drive system, and the second cooling loop is used for cooling an electric drive transmission assembly in the electric drive system. Because the electric drive transmission assembly has higher working efficiency in a high-temperature cooling environment, and the motor controller has higher working efficiency and higher current output capacity in a low-temperature cooling environment, compared with the method that the motor controller and the electric drive transmission assembly are cooled simultaneously by adopting the same cooling loop, the motor controller and the electric drive transmission assembly are cooled respectively and independently by adopting different cooling loops, the working performance requirements of the motor controller and the electric drive transmission assembly can be considered, and the cooling effect of the thermal management system on the electric drive system is optimized.

Drawings

FIG. 1 is a schematic diagram of a thermal management system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of another embodiment of a thermal management system provided by the present application;

FIG. 3 is a schematic diagram of another embodiment of a thermal management system provided by the present application;

FIG. 4 is a schematic diagram of a third embodiment of a cooling circuit according to the present application;

FIG. 5 is a schematic diagram of a first embodiment of a cooling circuit according to the present application;

FIG. 6 is a schematic diagram of another embodiment of a first cooling circuit provided by the present application;

FIG. 7 is a schematic view of another embodiment of a first cooling circuit provided by the present application;

FIG. 8 is a schematic view of another embodiment of a first cooling circuit provided by the present application;

FIG. 9 is a schematic diagram of a second cooling circuit according to an embodiment of the present application;

FIG. 10 is a flow chart of an embodiment of a thermal management method according to the present application;

FIG. 11 is a flow chart of another embodiment of a thermal management method provided by the present application;

FIG. 12 is a flow chart of another embodiment of a thermal management method provided by the present application;

FIG. 13 is a flow chart of another embodiment of a thermal management method provided by the present application;

FIG. 14 is a flow chart of another embodiment of a thermal management method provided by the present application;

FIG. 15 is a flow chart of another embodiment of a thermal management method provided by the present application;

FIG. 16 is a flow chart of an embodiment of a thermal management device according to the present application;

FIG. 17 is a schematic diagram of a frame of an embodiment of an electronic device provided by the present application;

FIG. 18 is a schematic diagram of a computer-readable storage medium according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and effects of the present application clearer and more specific, the present application will be described in further detail below with reference to the accompanying drawings and examples.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present application.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, "a plurality" herein means two or more than two. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C. "several" means at least one. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a thermal management system according to an embodiment of the application. As shown in fig. 1, the thermal management system includes a first cooling circuit 10 and a second cooling circuit 20. The first cooling circuit 10 is used for cooling the motor controller 11 in the electric drive system, and the second cooling circuit 20 is used for cooling the electric drive assembly 21 in the electric drive system. The electric drive assembly 21 includes a motor and a decelerator (not shown in fig. 1). The first cooling circuit 10 and the second cooling circuit 20 are independent of each other.

Illustratively, the first cooling circuit 10 and the second cooling circuit 20 include a cooling fluid therein. When it is detected that the motor controller 11 has a cooling requirement, the first cooling circuit 10 can be controlled to operate, so that the cooled cooling liquid in the first cooling circuit 10 flows to the motor controller 11, and cooling of the motor controller 11 is achieved. Or, when it is detected that the electric drive assembly 21 has a cooling requirement, the second cooling circuit 20 may be controlled to operate, so that the cooled cooling liquid in the second cooling circuit 20 flows to the electric drive assembly 21, thereby cooling the electric drive assembly 21.

In this embodiment, the thermal management system includes a first cooling circuit and a second cooling circuit that are independent of each other, where the first cooling circuit is used for cooling a motor controller in the electric drive system, and the second cooling circuit is used for cooling an electric drive transmission assembly in the electric drive system. Because the electric drive transmission assembly has higher working efficiency in a high-temperature cooling environment, and the motor controller has higher working efficiency and higher current output capacity in a low-temperature cooling environment, compared with the method that the motor controller and the electric drive transmission assembly are cooled simultaneously by adopting the same cooling loop, the motor controller and the electric drive transmission assembly are cooled respectively and independently by adopting different cooling loops, the working performance requirements of the motor controller and the electric drive transmission assembly can be met, and the cooling effect of the thermal management system on the electric drive system is optimized.

Alternatively, the present embodiment may provide a heat radiating member in the first cooling circuit 10 to achieve cooling of the motor controller 11.

Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a thermal management system according to the present application. In the thermal management system shown in fig. 2, a heat dissipation component 12 is connected in series to the first cooling circuit 10, and the heat dissipation component 12 can cool the cooling liquid in the first cooling circuit 10. Illustratively, the heat dissipating component 12 may be a heat sink.

Specifically, the first cooling circuit 10 may include an electronic water pump (not shown in fig. 2), a heat radiating member 12, and a motor controller 11 connected in series through pipes. The electronic water pump is used for driving the cooling liquid in the first cooling circuit 10 to flow. Illustratively, the water outlet of the electronic water pump is connected with the water inlet of the heat dissipation part 12, the water outlet of the heat dissipation part 12 is connected with the water inlet of the motor controller 11, and the water outlet of the motor controller 11 is connected with the water inlet of the electronic water pump. When it is detected that the motor controller 11 has a cooling demand, the heat radiating member 12 cools the coolant in the first cooling circuit 10, and the cooled coolant flows through to the motor controller 11, thereby realizing cooling of the motor controller 11. It should be noted that the connection sequence among the electronic water pump, the heat dissipation part 12 and the motor controller 11 in the first cooling circuit 10 described herein is merely an exemplary illustration, and the present embodiment is not limited thereto.

Optionally, this embodiment may further provide a cooling circuit, through which the first cooling circuit 10 is cooled, so as to indirectly cool the motor controller 11.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of a thermal management system according to the present application. As shown in fig. 3, the thermal management system further includes a third cooling circuit 30, the third cooling circuit 30 includes a heat exchange device 31, the refrigerant side and the coolant side of the heat exchange device 31 are respectively located in the third cooling circuit 30 and the first cooling circuit 10, and the refrigerant flowing through the refrigerant side of the heat exchange device 31 is used for cooling the coolant flowing through the coolant side of the heat exchange device 31. Illustratively, the heat exchange device 31 is a cooler (Chiller), and the refrigerant side of the cooler evaporates the refrigerant, so that the heat of the cooling liquid flowing through the cooling liquid side of the cooler can be absorbed, thereby cooling the motor controller 11 in the first cooling circuit 10. In other examples, the heat exchanging device 31 may be other devices having a heat exchanging function, for example, a heat exchanger, which is not particularly limited in this embodiment.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a third cooling circuit according to an embodiment of the application. As shown by a thick solid line in fig. 4, the third cooling circuit 30 includes a heat exchange device 31, a compressor 32, a condenser 33, and a first regulating valve 34. The refrigerant side of the heat exchanging device 31, the compressor 32, the condenser 33 and the first regulating valve 34 are connected in series through pipes in this order.

Specifically, the refrigerant outlet of the heat exchange device 31 on the refrigerant side is connected to the inlet of the compressor 32, the outlet of the compressor 32 is connected to the inlet of the condenser 33, the outlet of the condenser 33 is connected to one end of the first regulating valve 34, and the other end of the first regulating valve 34 is connected to the refrigerant inlet of the heat exchange device 31 on the refrigerant side. The compressor 32 is used for sucking low-temperature low-pressure gaseous refrigerant output at the refrigerant outlet of the heat exchange device 31 and compressing the gaseous refrigerant into high-temperature high-pressure gaseous refrigerant; the condenser 33 is used for condensing the gaseous refrigerant output from the outlet of the compressor into a liquid refrigerant; the heat exchange device 31 is used for evaporating the liquid refrigerant flowing into the refrigerant side into a low-temperature low-pressure gaseous refrigerant; the first regulating valve 34 is used for regulating the flow rate of the refrigerant flowing into the refrigerant side of the heat exchange device 31. Illustratively, the first regulator valve 34 is a one-way valve.

It should be noted that at least one of the heat exchange device 31, the compressor 32, the condenser 33, and the first regulating valve 34 in the third cooling circuit 30 may be a device in an original passenger cabin cooling circuit in the thermal management system, that is, the third cooling circuit may share a part of devices with the passenger cabin cooling circuit; alternatively, the heat exchanging device 31, the compressor 32, the condenser 33 and the first regulating valve 34 in the third cooling circuit 30 are separately provided devices.

When the heat exchange device 31, the compressor 32, the condenser 33 and the first regulating valve 34 in the third cooling circuit 30 are all devices in the passenger compartment cooling circuit, the thermal management system further includes an evaporator 35, a second regulating valve 36 and a blower 37. Specifically, one end of the second regulating valve 36 is connected to the outlet of the condenser 33, the other end of the second regulating valve 36 is connected to the inlet of the evaporator 35, and the outlet of the evaporator 35 is connected to the inlet of the compressor 32. The second regulating valve 36 is used for regulating the flow of the refrigerant flowing into the evaporator 35, and the second regulating valve 36 is illustratively a one-way regulating valve; the evaporator 35 is used for evaporating the liquid refrigerant flowing out from the outlet of the condenser 33 into a gaseous refrigerant, and can absorb heat of surrounding air in the evaporation process; the blower 37 is used to blow the air having absorbed heat into the passenger compartment, thereby achieving cooling of the passenger compartment.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a first cooling circuit according to an embodiment of the application. As shown by a thick solid line in fig. 5, the first cooling circuit 10 includes a motor controller 11, a first electronic water pump 13, a battery 14, and a heat exchanging device 31. The motor controller 11, the first electronic water pump 13, the battery 14, and the coolant side of the heat exchanging device 31 are connected in series by pipes.

Illustratively, the water outlet of the first electronic water pump 13 is connected with the water inlet of the motor controller 11, the water outlet of the motor controller 11 is connected with the water inlet of the battery 14, the water outlet of the battery 14 is connected with the cooling liquid inlet of the cooling liquid side of the heat exchange device 31, and the cooling liquid outlet of the cooling liquid side of the heat exchange device 31 is connected with the water inlet of the first electronic water pump 13. It should be noted that the connection sequence between the devices in the first cooling circuit 10 shown in fig. 5 is merely an exemplary illustration, and the present embodiment is not limited thereto.

In an example, when there is a cooling requirement for the battery 14 and the motor controller 11 at the same time, the first cooling circuit 10 and the third cooling circuit 30 may be controlled to operate simultaneously (the heat exchange device 31 and the first electronic water pump 13 operate), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 through the heat exchange device 31, and the first electronic water pump 13 in the first cooling circuit 10 drives the cooled cooling liquid to flow through the motor controller 11 and the battery 14, so as to realize the simultaneous cooling of the motor controller 11 and the battery 14.

In another example, when there is no cooling requirement for the battery 14 and there is a cooling requirement for the motor controller 11, the first cooling circuit 10 may be controlled to operate, the third cooling circuit 30 may be controlled to stop operating (the heat exchange device 31 is turned off, the first electronic water pump 13 is operated), the first electronic water pump 13 drives the cooling liquid in the first cooling circuit 10 to flow through to the battery 14, and since the battery 14 is made of a metal material, the heat capacity of the battery 14 is higher, the heat in the cooling liquid may be absorbed, and the cooling liquid after absorbing the heat flows through to the motor controller 11, so that the motor controller 11 may be cooled.

In the present embodiment, the motor controller 11 and the battery 14 in the first cooling circuit 10 are connected in series. On the one hand, in the case that the motor controller 11 and the battery 14 have cooling requirements at the same time, the third cooling circuit 30 is shared to realize simultaneous cooling of the motor controller 11 and the battery 14, so that the design cost of the thermal management system can be reduced. On the other hand, in the case where the motor controller 11 has a cooling demand but the battery 14 does not have a cooling demand, the cooling of the motor controller 11 can be achieved by absorbing the heat of the coolant by the battery 14. Thus, the operation of the compressor 32 and other devices can be stopped, and the operation energy consumption of the thermal management system can be reduced.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another embodiment of the first cooling circuit provided by the present application. As shown by a thick solid line in fig. 6, the first cooling circuit 10 includes a motor controller 11, a second electronic water pump 15, and a heat exchanging device 31, and the cooling liquid sides of the motor controller 11, the second electronic water pump 15, and the heat exchanging device 31 are connected in series by pipes.

Illustratively, the water outlet of the second electronic water pump 15 is connected to the water inlet of the motor controller 11, the water outlet of the motor controller 11 is connected to the cooling liquid inlet of the cooling liquid side of the heat exchange device 31, and the cooling liquid outlet of the cooling liquid side of the heat exchange device 31 is connected to the water inlet of the second electronic water pump 15. It should be noted that the connection sequence between the devices in the first cooling circuit 10 shown in fig. 6 is merely an exemplary illustration, and the present embodiment is not limited thereto.

When the motor controller 11 has a cooling requirement, the first cooling circuit 10 and the third cooling circuit 30 can be controlled to operate simultaneously (the heat exchange device 31 and the second electronic water pump 15 operate), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 through the heat exchange device 31, and the second electronic water pump 15 in the first cooling circuit 10 drives the cooled cooling liquid to flow through the motor controller 11, so that the motor controller 11 is cooled.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of a first cooling circuit according to the present application. As shown by a thick solid line in fig. 7, the first cooling circuit 10 includes a first branch including the third electronic water pump 16 and the heat exchanging device 31, the coolant sides of the third electronic water pump 16 and the heat exchanging device 31 being connected in series by a pipe, and a second branch including the motor controller 11 and the first valve 41 being connected in series by a pipe, both ends of the second branch being connected to both ends of the first branch, respectively.

Illustratively, the water outlet of the third electronic water pump 16 is connected to one end of the first valve 41, the other end of the first valve 41 is connected to the water inlet of the motor controller 11, the water outlet of the motor controller 11 is connected to the cooling liquid inlet of the cooling liquid side of the heat exchange device 31, and the cooling liquid outlet of the cooling liquid side of the heat exchange device 31 is connected to the water inlet of the third electronic water pump 16. It should be noted that, the connection sequence between the devices in the first branch and the second branch in fig. 7 is only exemplary, and the embodiment is not limited in particular.

The thermal management system further includes a battery cooling circuit including a first branch and a third branch, the third branch including the battery 14 and the second valve 42 connected in series through a pipe, both ends of the first branch being further connected with both ends of the third branch, respectively. Illustratively, one end of the second valve 42 is connected to the water outlet of the third electronic water pump 16, the other end of the second valve 42 is connected to the water inlet of the battery 14, and the water outlet of the battery 14 is connected to the coolant inlet of the coolant side of the heat exchanging device 31. It should be noted that, the connection sequence between the devices in the third branch in fig. 7 is merely an exemplary illustration, and the present embodiment is not limited thereto.

In an example, when there is no cooling requirement for the battery 14 and there is a cooling requirement for the motor controller 11, the first cooling circuit 10 and the third cooling circuit 30 may be controlled to operate simultaneously (the first valve 41 is configured to be in an on state, the second valve 42 is configured to be in an off state, the heat exchange device 31 and the third electronic water pump 16 are both operated), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 through the heat exchange device 31, and the third electronic water pump 16 in the first cooling circuit 10 drives the cooled cooling liquid to flow through the motor controller 11, so as to realize cooling of the motor controller 11.

In another example, when there is a cooling requirement for the battery 14 and no cooling requirement for the motor controller 11, the battery cooling circuit and the third cooling circuit 30 may be controlled to operate simultaneously (the first valve 41 is configured in an off state, the second valve 42 is configured in an on state, the heat exchange device 31 and the third electronic water pump 16 are both operated), the third cooling circuit 30 cools the cooling liquid in the battery cooling circuit through the heat exchange device 31, and the third electronic water pump 16 in the battery cooling circuit drives the cooled cooling liquid to flow through the battery 14, so as to realize cooling of the battery 14.

In yet another example, when there is a cooling requirement for the battery 14 and the motor controller 11 at the same time, the first cooling circuit 10, the battery cooling circuit and the third cooling circuit 30 may be controlled to operate simultaneously (the first valve 41 and the second valve 42 are both configured to be in a conducting state, the heat exchange device 31 and the third electronic water pump 16 are both operated), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 and the battery cooling circuit through the heat exchange device 31, and the third electronic water pump 16 drives the cooled cooling liquid to flow through the motor controller 11 and the battery 14, so as to realize cooling of the motor controller 11 and the battery 14.

In the present embodiment, the motor controller 11 in the first cooling circuit 10 and the battery 14 in the battery cooling circuit are arranged in parallel. In one aspect, the first cooling circuit 10 and the battery cooling circuit may share the third electronic water pump 16, a portion of the piping, and components in the third cooling circuit 30, reducing the thermal management system design cost. On the other hand, the operation of the first cooling circuit 10 and the battery cooling circuit can be controlled according to the actual cooling requirements of the motor controller 11 and the battery 14, so that the cooling of the motor controller 11 and the cooling of the battery 14 are not interfered with each other, and the flexibility of the thermal management system is improved.

Referring to fig. 8, fig. 8 is a schematic structural diagram of another embodiment of a first cooling circuit according to the present application. As shown by the thick solid line in fig. 8, the first cooling circuit 10 includes a fourth branch, a fifth branch, and a sixth branch. The fourth branch comprises a fourth electronic water pump 17, a third valve 43 and a heat exchange device 31, and the cooling liquid sides of the fourth electronic water pump 17, the third valve 43 and the heat exchange device 31 are connected in series through pipelines; the fifth branch comprises a motor controller 11 and a fourth valve 44 connected in series by a pipe; the sixth branch comprises a fifth electronic water pump 18, a battery and a fifth valve 45 which are connected in series through pipelines, two ends of the fifth branch are respectively connected with two ends of the fourth branch, and the fifth branch is connected with the sixth branch in parallel. Alternatively, the fifth electronic water pump 18 may be disposed in the fifth branch, which is not particularly limited in this embodiment. The third valve 43, the fourth valve 44 and the fifth valve 45 may be one-way valves or two-way valves.

Illustratively, the cooling fluid outlet of the cooling fluid side of the heat exchange device 31 is connected to the water inlet of the fourth electronic water pump 17, the water outlet of the fourth electronic water pump 17 is connected to one end of the third valve 43, the other end of the third valve 43 is connected to one end of the fourth valve 44, the other end of the fourth valve 44 is connected to the water inlet of the motor controller 11, the water outlet of the motor controller 11 is connected to the cooling fluid inlet of the cooling fluid side of the heat exchange device 31, the other end of the third valve 43 is also connected to one end of the fifth valve 45, the other end of the fifth valve 45 is connected to the water inlet of the battery 14, and the water outlet of the battery 14 is connected to the cooling fluid inlet of the cooling fluid side of the heat exchange device 31. It should be noted that, the connection sequence between the devices in the fourth branch, the fifth branch and the sixth branch in fig. 8 is merely an exemplary illustration, and the present embodiment is not limited thereto.

In the present embodiment, in the case where both the third valve 43 and the fourth valve 44 are configured in the on state, the coolant side of the heat exchange device 31, the fourth electronic water pump 17, the third valve 43, the fourth valve 44, and the motor controller 11 form a first sub-cooling circuit. In the case where the third valve 43 is configured in the off state, and the fourth valve 44 and the fifth valve 45 are each configured in the on state, the fifth electronic water pump 18, the fourth valve 44, the fifth valve 45, the motor controller 11, and the battery 14 form a second sub-cooling circuit. Both the first sub-cooling circuit and the second sub-cooling circuit may be implemented to cool the motor controller 11.

In an example, when there is no cooling requirement for the battery 14 and there is a cooling requirement for the motor controller 11, the first sub-cooling circuit and the third cooling circuit 30 may be controlled to operate simultaneously (the third valve 43 and the fourth valve 44 are configured to be in an on state, the fifth valve 45 is configured to be in an off state, the heat exchange device 31 and the fourth electronic water pump 17 are both operated, and the fifth electronic water pump 18 is turned off), the third cooling circuit 30 cools the cooling liquid in the first sub-cooling circuit through the heat exchange device 31, and the fourth electronic water pump 17 in the first sub-cooling circuit drives the cooled cooling liquid to flow through the motor controller 11, so as to realize cooling of the motor controller 11. This example may cool the motor controller 11 alone when there is a large cooling demand for the motor controller 11.

In another example, when there is no cooling requirement for the battery 14 and there is a cooling requirement for the motor controller 11, the second sub-cooling circuit may be controlled to operate (the third valve 43 is configured to be in an off state, the fourth valve 44 and the fifth valve 45 are configured to be in an on state, the heat exchange device 31 and the fourth electronic water pump 17 are turned off, and the fifth electronic water pump 18 is operated), the fifth electronic water pump 18 drives the cooling liquid in the second sub-cooling circuit to flow to the battery 14, the battery 14 may absorb heat of the cooling liquid, and the cooling liquid after absorbing heat flows through the motor controller 11, so as to realize cooling of the motor controller 11. This example may cool the motor controller 11 alone when there is a small cooling demand for the motor controller 11.

In yet another example, when there is a cooling demand on the battery 14 and there is no cooling demand on the motor controller 11, the first cooling circuit 10 and the third cooling circuit 30 may be controlled to operate simultaneously (the third valve 43 and the fifth valve 45 are configured to be in an on state, the fourth valve 44 is configured to be in an off state, the heat exchange device 31, the fourth electronic water pump 17 and the fifth electronic water pump 18 are all operated), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 through the heat exchange device 31, and the fourth electronic water pump 17 and the fifth electronic water pump 18 drive the cooled cooling liquid to flow through the battery 14, so as to realize cooling of the battery 14.

In yet another example, when there is a cooling requirement for the battery 14 and the motor controller 11 at the same time, the first cooling circuit 10 and the third cooling circuit 30 may be controlled to operate simultaneously (the third valve 43, the fourth valve 44 and the fifth valve 45 are all configured to be in the conducting state, the heat exchange device 31, the fourth electronic water pump 17 and the fifth electronic water pump 18 are all operated), the third cooling circuit 30 cools the cooling liquid in the first cooling circuit 10 through the heat exchange device 31, and the fourth electronic water pump 17 and the fifth electronic water pump 18 drive the cooled cooling liquid to flow through the motor controller 11 and the battery 14, so as to realize cooling of the motor controller 11 and the battery 14.

In the present embodiment, the motor controller 11 and the battery 14 in the first cooling circuit 10 are arranged in parallel. In one aspect, the motor controller 11 and the battery 14 may share the fourth electronic water pump 17, a portion of the plumbing, and components in the third cooling circuit 30, reducing the cost of the thermal management system design. On the other hand, the operation of the first sub-cooling circuit and the second sub-cooling circuit can be controlled according to the actual cooling requirements of the motor controller 11 and the battery 14, and the cooling of the motor controller 11 and the cooling of the battery 14 are not mutually interfered, so that the flexibility of the thermal management system is improved.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a second cooling circuit according to an embodiment of the application. As shown by the thick solid line in fig. 9, the second cooling circuit 20 includes an electric drive assembly 21, a sixth electric water pump 22, a radiator 23, and a three-way valve 24. The first port and the second port of the electric drive assembly 21, the sixth electronic water pump 22, the radiator 23, and the three-way valve 24 are connected in series by pipes.

Illustratively, the water outlet of the electric drive assembly 21 is connected to a first port of the three-way valve 24, a second port of the three-way valve 24 is connected to an inlet of the radiator 23, an outlet of the radiator 23 is connected to a water inlet of the sixth electric water pump 22, and a water outlet of the sixth electric water pump 22 is connected to a water inlet of the electric drive assembly 21. The third port of the three-way valve 24 is connected with the water inlet of the sixth electronic water pump 22. The three-way valve 24 has a first state and a second state, the first port of the three-way valve 24 and the second port of the three-way valve 24 being in communication when the three-way valve 24 is configured in the first state, and the first port of the three-way valve 24 and the third port of the three-way valve 24 being in communication when the three-way valve 24 is configured in the second state.

When there is a cooling requirement for the electric drive assembly 21, the three-way valve 24 is configured to a first state, and the electric drive assembly 21, the first port of the three-way valve 24, the second port of the three-way valve 24, the radiator 23, and the sixth electronic water pump 22 form the second cooling circuit 20. The sixth electronic water pump 22 drives the cooling liquid to flow through the radiator 23, the radiator 23 cools the cooling liquid, and the cooled cooling liquid flows through the electric drive assembly 21 to cool the electric drive assembly 21. When there is no cooling demand on the electric drive assembly 21, the three-way valve 24 is configured to the second state. Since the coolant does not pass through the radiator 23, the temperature of the electric drive assembly 21 in operation can be raised quickly.

Alternatively, the radiator 23 may share the fan 51 with the condenser 33 in the third cooling circuit 30. When the radiator 23 is insufficient to meet the cooling requirement of the electric drive assembly, the fan 51 may be turned on to better meet the cooling requirement of the electric drive assembly.

In the embodiment, in consideration of the fact that the working efficiency of the electric drive transmission assembly is greatly influenced by the temperature of the lubricating oil of the speed reducer, the higher the temperature of the lubricating oil of the speed reducer is, the lower the stirring loss is, the higher the working efficiency of the electric drive transmission assembly is, namely, the electric drive transmission assembly is suitable for a high-temperature cooling environment; the current output capability of the motor controller is limited by the junction temperature of the IGBT (Insulated Gate Bipolar Transistor ), and the higher the temperature of the cooling liquid is, the lower the current output capability of the motor controller is, the peak power and peak torque design value of the electric drive are limited, namely, the motor controller is more suitable for a low-temperature cooling environment. Compared with the method that the same cooling loop is adopted to cool the motor controller and the electric drive assembly simultaneously, the independent first cooling loop and the independent second cooling loop are adopted to cool the motor controller and the electric drive assembly in the electric drive system respectively, so that the working performance requirements of the motor controller and the electric drive assembly can be met, and the cooling effect of the thermal management system on the electric drive system is optimized.

Referring to fig. 10, fig. 10 is a flow chart illustrating an embodiment of a thermal management method according to the present application, which is applied to the thermal management system shown in any of the foregoing fig. 1 to 10. The method may be performed by a vehicle controller or other controller, for example. It should be noted that, if there are substantially the same results, the method of the present application is not limited to the flow sequence shown in fig. 10. As shown in fig. 10, the method includes the steps of:

s101: detecting whether a cooling requirement exists in motor control.

In an embodiment, the water inlet of the motor controller and the water inlet of the electric drive assembly are respectively provided with a temperature sensor, so that whether the motor controller has a cooling requirement or not can be judged according to the temperature of the cooling liquid flowing through the motor controller, and whether the electric drive assembly has a cooling requirement or not can be judged according to the temperature of the cooling liquid flowing through the electric drive assembly. For example, when the temperature of the coolant flowing through the motor controller is greater than or equal to a certain temperature threshold, determining that the motor controller has a cooling demand; when the temperature of the cooling fluid flowing through the motor controller is less than a certain temperature threshold, it is determined that the motor controller has no cooling demand. When the temperature of the cooling liquid flowing through the electric drive transmission assembly is greater than or equal to a certain temperature threshold value, determining that the electric drive transmission assembly has a cooling requirement; and when the temperature of the cooling liquid flowing through the electric drive transmission assembly is smaller than a certain temperature threshold value, determining that the electric drive transmission assembly has no cooling requirement.

S102: in response to determining that a cooling demand exists for a motor controller in an electric drive system, a first cooling circuit in a thermal management system is controlled to cool the motor controller.

S103: in response to determining that a cooling demand exists for an electric drive assembly in the electric drive system, a second cooling circuit in the thermal management system is controlled to cool the electric drive assembly.

The relevant contents in step S102 and step S103 may refer to the embodiments shown in fig. 1 to 10, and a detailed description thereof is omitted herein.

In this embodiment, the thermal management system includes a first cooling circuit and a second cooling circuit that are independent of each other, when there is a cooling requirement for the motor controller, the first cooling circuit is controlled to cool the motor controller in the electric drive system, and when there is a cooling requirement for the electric drive assembly, the second cooling circuit is controlled to cool the electric drive assembly in the electric drive system. Because the electric drive transmission assembly has higher working efficiency in a high-temperature cooling environment, and the motor controller has higher working efficiency and higher current output capacity in a low-temperature cooling environment, compared with the method that the motor controller and the electric drive transmission assembly are cooled simultaneously by adopting the same cooling loop, the motor controller and the electric drive transmission assembly are cooled respectively and independently by adopting different cooling loops, the working performance requirements of the motor controller and the electric drive transmission assembly can be met, and the cooling effect of the thermal management system on the electric drive system is optimized.

Referring to fig. 11, fig. 11 is a flow chart illustrating a thermal management method according to another embodiment of the present application, which is applied to the thermal management system shown in any of the foregoing fig. 1 to 10. The method may be performed by a vehicle controller or other controller, for example. As shown in fig. 11, the method includes the steps of:

s111: a target operating mode of the thermal management system is determined.

The thermal management system includes a number of modes of operation, the target mode of operation being one of the number of modes of operation.

In one embodiment, the target operating mode of the thermal management system is determined by a user selection. For example, a target operating mode is received that is entered by a user. For another example, identification information representing the target working mode input by the user is received, and the identification information is analyzed to obtain the target working mode. Illustratively, the identification information may be letters, numbers, etc. For another example, an operation mode selection instruction input by the user is received, and the selected operation mode is used as the target operation mode. For example, the user may input the target operation mode, identification information of the target operation mode, or an operation mode selection instruction at a display interface of the mobile terminal device or a display interface of the vehicle-mounted terminal.

S112: and judging whether the target device has a cooling requirement or not based on the target working mode and the temperature of the cooling liquid flowing through the target device, wherein the target device is a motor controller or an electric drive assembly.

In an embodiment, in the case where the target device is a motor controller, step S112 includes: and selecting a temperature threshold corresponding to the target working mode from the first corresponding relation as a first target temperature threshold, and judging whether the motor controller has a cooling requirement or not based on the first target temperature threshold and the temperature of the cooling liquid flowing through the motor controller. The first corresponding relation comprises temperature thresholds corresponding to the working modes respectively. In the first corresponding relation, the temperature thresholds corresponding to different working modes are different. The temperature threshold value corresponding to each working mode in the first corresponding relation can be set according to actual working efficiency and energy consumption conditions of the motor controller at different temperatures.

For example, determining that a cooling demand exists for the motor controller when a temperature of the coolant flowing through the motor controller is greater than or equal to a first target temperature threshold; when the temperature of the cooling fluid flowing through the motor controller is less than the first target temperature threshold, it is determined that the motor controller is not in need of cooling.

In one embodiment, in the case where the target device is an electric drive assembly, step S112 includes: selecting a temperature threshold corresponding to the target working mode from the second corresponding relation as a second target temperature threshold; based on the second target temperature threshold and the temperature of the cooling fluid flowing through the electric drive assembly, it is determined whether a cooling demand exists for the electric drive assembly. The second corresponding relation comprises temperature thresholds corresponding to the working modes respectively. In the second corresponding relation, the temperature thresholds corresponding to different working modes are different. And the temperature threshold values corresponding to the same working mode in the first corresponding relation and the second corresponding relation are different. The temperature threshold value corresponding to each working mode in the second corresponding relation can be set according to actual working efficiency and energy consumption conditions of the electric drive assembly at different temperatures.

The method may further include determining that the cooling demand is present for the electric drive assembly when the temperature of the coolant flowing through the electric drive assembly is greater than or equal to a second target temperature threshold, or when the temperature of the coolant flowing through the electric drive assembly is less than the second target temperature threshold and a difference between the temperature of the coolant flowing through the electric drive assembly and the second target temperature threshold is less than or equal to a preset difference threshold. And when the temperature of the cooling liquid flowing through the electric drive transmission assembly is smaller than a second target temperature threshold value and the difference value between the temperature of the cooling liquid flowing through the electric drive transmission assembly and the second target temperature threshold value is larger than a preset difference value threshold value, determining that the electric drive transmission assembly has no cooling requirement.

In a specific application, the plurality of working modes may include an energy-saving mode, a normal mode and a motion mode, wherein a temperature threshold corresponding to the energy-saving mode is greater than a temperature threshold corresponding to the normal mode, and a temperature threshold corresponding to the normal mode is greater than a temperature threshold corresponding to the motion mode. For example, for the motor controller, the temperature thresholds corresponding to the energy saving mode, the normal mode, and the motion mode may be set to X1, X2, and X3, respectively, X1 being greater than X2, and X2 being greater than X3; for the electric drive assembly, the temperature thresholds corresponding to the energy saving mode, the normal mode and the motion mode may be set to Y1, Y2 and Y3, respectively, with Y1 being greater than Y2 and Y1 being greater than Y3.

In the three working modes, the economy of the energy-saving mode is higher than that of the common mode, and the economy of the common mode is higher than that of the sport mode; the power performance of the energy-saving mode is smaller than that of the normal mode, and the power performance of the normal mode is smaller than that of the motion mode.

S113: in response to determining that a cooling demand exists for the motor controller, a first cooling circuit in the thermal management system is controlled to cool the motor controller.

S114: in response to determining that the electric drive assembly has a cooling demand, a second cooling circuit in the thermal management system is controlled to cool the electric drive assembly.

The relevant contents in step S113 and step S114 may refer to the embodiments shown in fig. 1 to 10, and a detailed description thereof will be omitted herein.

In this embodiment, the target device (motor controller or electric drive assembly) is cooled based on different target temperature thresholds in different target operating modes. Because the target working mode is set by a user, different requirements of the user on the dynamic property and the economical efficiency of the vehicle can be met, and the cooling effect of the thermal management system on the electric drive system is further improved.

Referring to fig. 12, fig. 12 is a flow chart illustrating a thermal management method according to another embodiment of the application, which is applied to the thermal management system shown in fig. 5. As shown in fig. 12, the method includes the steps of:

s121: it is detected whether a cooling demand exists for the battery and the motor controller.

In one embodiment, the cooling demand of the battery is determined when the temperature of the coolant flowing through the battery is greater than or equal to a third target temperature threshold; when the temperature of the coolant flowing through the battery is less than the third target temperature threshold, it is determined that there is no cooling demand for the battery. Illustratively, the third target temperature threshold is greater than the aforementioned first target temperature threshold. That is, the cooling requirement of the motor controller is preferably satisfied in the present embodiment.

The related content of detecting whether the motor controller has a cooling requirement can refer to the aforementioned step S101 or the aforementioned step S112, and will not be described herein.

S122: and controlling the first electronic water pump and the heat exchange device to operate in response to the simultaneous cooling requirements of the battery and the motor controller.

S123: and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the first electronic water pump to operate and the heat exchange device to be closed.

The relevant contents of step S122 and step S123 may refer to the embodiment shown in fig. 5, and will not be described herein.

Referring to fig. 13, fig. 13 is a flow chart illustrating a thermal management method according to another embodiment of the application, which is applied to the thermal management system shown in fig. 6. As shown in fig. 13, the method includes the steps of:

s131: detecting whether a cooling requirement exists in the motor controller.

The related content may refer to the aforementioned step S101 or the aforementioned step S112, and will not be described herein.

S132: and controlling the second electronic water pump and the heat exchange device to operate in response to the cooling requirement of the motor controller.

The related content may refer to the embodiment shown in fig. 6, and will not be described herein.

Referring to fig. 14, fig. 14 is a flow chart illustrating a thermal management method according to another embodiment of the application, which is applied to the thermal management system shown in fig. 7. As shown in fig. 14, the method includes the steps of:

S141: it is detected whether a cooling demand exists for the battery and the motor controller.

The related content of detecting whether the battery has a cooling requirement may refer to the aforementioned step S121, and the related content of detecting whether the motor controller has a cooling requirement may refer to the aforementioned step S101 or the aforementioned step S112, which are not described herein.

S142: and responding to the simultaneous cooling requirement of the battery and the motor controller, controlling the first valve and the second valve to be in a conducting state, and controlling the third electronic water pump and the heat exchange device to operate.

S143: and in response to the fact that the battery does not have a cooling requirement and the motor controller has a cooling requirement, controlling the first valve to be in a conducting state, the second valve to be in a cut-off state and controlling the third electronic water pump and the heat exchange device to operate.

The relevant contents of step S142 and step S143 can refer to the embodiment shown in fig. 7, and will not be described herein.

Referring to fig. 15, fig. 15 is a flow chart illustrating a thermal management method according to another embodiment of the application, which is applied to the thermal management system shown in fig. 8. As shown in fig. 15, the method includes the steps of:

s151: it is detected whether a cooling demand exists for the battery and the motor controller.

S152: and in response to the simultaneous cooling requirement of the battery and the motor controller, controlling the third valve, the fourth valve and the fifth valve to be in a conducting state at the same time, and controlling the fourth electronic water pump, the fifth electronic water pump and the heat exchange device to operate.

S153: and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the third valve to be in a cut-off state, controlling the fourth valve and the fifth valve to be in a conduction state, and controlling the fourth electronic water pump and the heat exchange device to be closed and controlling the fifth electronic water pump to operate.

Optionally, step S153 may also be replaced with: and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the third valve and the fourth valve to be in a conducting state, controlling the fifth valve to be in a cut-off state, controlling the heat exchange device and the fourth electronic water pump to operate, and controlling the fifth electronic water pump to be closed.

The relevant contents of step S152 and step S153 may refer to the embodiment shown in fig. 8, and will not be described herein.

Optionally, in this embodiment, in a case where there is a cooling requirement of the motor controller, the thermal management method further includes: detecting a torque output demand of the vehicle; and controlling the running gear of the target electronic water pump based on the torque output requirement.

The target electronic water pump may be the first electronic water pump, the second electronic water pump, the third electronic water pump or the fourth electronic water pump. The magnitude of the torque output requirement of the vehicle is positively correlated with the water pump rotation speed under the running gear of the target electronic water pump, namely, when the torque output requirement of the vehicle is larger, the running gear of the target electronic water pump is higher, and the corresponding water pump rotation speed of the target electronic water pump is higher; when the torque output requirement of the vehicle is smaller, the lower the running gear of the target electronic water pump is, the lower the water pump rotating speed of the corresponding target electronic water pump is.

For example, the operation gear of the target electronic water pump corresponding to the detected current torque output requirement may be determined according to a preset corresponding relationship. The preset corresponding relation comprises a plurality of torque output demands and preset water pump running gears corresponding to the torque output demands. The preset correspondence may be set according to a test.

In this embodiment, the gear of the target electronic water pump can be controlled according to the actual torque output requirement of the vehicle. When the vehicle is greater to the torque output demand, through the water pump rotational speed that improves target electronic water pump to increase the coolant flow in the first cooling circuit, on the one hand, can improve cooling rate, on the other hand, can in time cool off motor controller's IGBT device, further improve motor controller's current output ability. When the vehicle has smaller torque output requirement, the water pump rotating speed of the target electronic water pump is reduced to reduce the flow of the cooling liquid in the first cooling loop, so that the energy saving can be further realized while the cooling requirement is met.

Referring to fig. 16, fig. 16 is a schematic diagram illustrating a frame of a thermal management device according to an embodiment of the application. In this embodiment, the thermal management device 160 includes: a detection module 161 and a control module 162. The detection module 161 is used for detecting whether the electric drive system has a cooling requirement. The control module 162 is configured to control a first cooling circuit in the thermal management system to cool the motor controller in the electric drive system in response to determining that the motor controller has a cooling demand; in response to determining that a cooling demand exists for an electric drive assembly in the electric drive system, a second cooling circuit in the thermal management system is controlled to cool the electric drive assembly.

Optionally, the thermal management system includes several modes of operation. The thermal management system further comprises a determination module 163, the determination module 163 being configured to determine a target operating mode of the thermal management system, the target operating mode being one of a number of operating modes. The detection module 161 is configured to determine whether a cooling requirement exists for a target device based on a target operating mode and a temperature of a coolant flowing through the target device, wherein the target device is a motor controller or an electric drive assembly.

Optionally, in the case that the target device is a motor controller, the detection module 161 is configured to select, as the first target temperature threshold, a temperature threshold corresponding to the target operation mode from a first correspondence, where the first correspondence includes temperature thresholds corresponding to the plurality of operation modes, respectively, and determine whether the motor controller has a cooling requirement based on the first target temperature threshold and a temperature of the cooling liquid flowing through the motor controller. And/or, in the case that the target device is an electric drive assembly, the detection module 161 is configured to select, from a second corresponding relationship, a temperature threshold corresponding to the target working mode as the second target temperature threshold, where the second corresponding relationship includes temperature thresholds corresponding to the plurality of working modes respectively, and the temperature thresholds corresponding to the same working mode in the first corresponding relationship and the second corresponding relationship are different, and determine whether the electric drive assembly has a cooling requirement based on the second target temperature threshold and a temperature of the coolant flowing through the electric drive assembly.

Optionally, the plurality of working modes include an energy-saving mode, a normal mode and a motion mode, the temperature threshold corresponding to the energy-saving mode is greater than the temperature threshold corresponding to the normal mode, and the temperature threshold corresponding to the normal mode is greater than the temperature threshold corresponding to the motion mode.

Optionally, a target electronic water pump is included in the first cooling circuit, and the detection module 161 is further configured to detect a torque output demand of the vehicle in the event that a cooling demand exists in the motor controller. The control module 162 is used for controlling the running gear of the target electronic water pump based on the torque output requirement; the torque output requirement is positively correlated with the rotation speed of the water pump under the running gear of the target electronic water pump.

Optionally, the detection module 161 is used to detect whether there is a cooling demand on the battery and motor controller. The control module 162 is configured to control the operation of the first electronic water pump and the heat exchange device in response to the simultaneous cooling requirements of the battery and the motor controller; and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the first electronic water pump to operate and the heat exchange device to be closed.

Optionally, the detection module 161 is configured to detect whether a cooling demand exists for the motor controller. The control module 162 is configured to control operation of the second electronic water pump and the heat exchange device in response to a cooling demand from the motor controller.

Optionally, the detection module 161 is used to detect whether there is a cooling demand on the battery and motor controller. The control module 162 is configured to control the first valve and the second valve to be in a conducting state and control the third electronic water pump and the heat exchange device to operate in response to the simultaneous cooling requirements of the battery and the motor controller; and in response to the fact that the battery does not have a cooling requirement and the motor controller has a cooling requirement, controlling the first valve to be in a conducting state, the second valve to be in a cut-off state and controlling the third electronic water pump and the heat exchange device to operate.

Optionally, the detection module 161 is used to detect whether there is a cooling demand on the battery and motor controller. The control module 162 is configured to control the third valve, the fourth valve, and the fifth valve to be in a conducting state at the same time, and control the fourth electronic water pump, the fifth electronic water pump, and the heat exchange device to operate in response to the simultaneous cooling requirements of the battery and the motor controller; and responding to the condition that the battery does not have cooling requirement and the motor controller has cooling requirement, controlling the third valve to be in a cut-off state, controlling the fourth valve and the fifth valve to be in a conduction state, and controlling the fourth electronic water pump and the heat exchange device to be closed and controlling the fifth electronic water pump to operate.

It should be noted that, the apparatus of this embodiment may perform the steps in the above method, and details of the related content refer to the above method section, which is not described herein again.

Referring to fig. 17, fig. 17 is a schematic diagram of a frame of an embodiment of an electronic device according to the present application. In this embodiment, the electronic device 170 includes a memory 171 and a processor 172.

The processor 172 may also be referred to as a CPU (Central Processing Unit ). The processor 172 may be an integrated circuit chip having signal processing capabilities. The processor 172 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The general purpose processor may be a microprocessor or the processor 172 may be any conventional processor 172 or the like.

The memory 171 in the electronic device 170 is used for storing program instructions required for the execution of the processor 172.

The processor 172 is configured to execute program instructions to implement the thermal management method of the present application.

Referring to fig. 18, fig. 18 is a schematic diagram of a frame of an embodiment of a computer readable storage medium according to the present application. The computer readable storage medium 180 of the embodiment of the present application stores program instructions 181, which when executed, implement the thermal management method provided by the present application. Wherein the program instructions 181 may be stored in the form of a software product in the computer-readable storage medium 180 described above to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the various embodiments of the application. And the aforementioned computer-readable storage medium 180 includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes, or a terminal device such as a computer, a server, a mobile phone, a tablet, or the like.

According to the scheme, the thermal management system comprises the first cooling loop and the second cooling loop which are independent of each other, when the motor controller has a cooling requirement, the first cooling loop is controlled to cool the motor controller in the electric drive system, and when the electric drive transmission assembly has a cooling requirement, the second cooling loop is controlled to cool the electric drive transmission assembly in the electric drive system. Because the electric drive transmission assembly has higher working efficiency in a high-temperature cooling environment, and the motor controller has higher working efficiency and higher current output capacity in a low-temperature cooling environment, compared with the method that the motor controller and the electric drive transmission assembly are cooled simultaneously by adopting the same cooling loop, the motor controller and the electric drive transmission assembly are cooled respectively and independently by adopting different cooling loops, the working performance requirements of the motor controller and the electric drive transmission assembly can be met, and the cooling effect of the thermal management system on the electric drive system is optimized.

In some embodiments, functions or modules included in an apparatus provided by the embodiments of the present disclosure may be used to perform a method described in the foregoing method embodiments, and specific implementations thereof may refer to descriptions of the foregoing method embodiments, which are not repeated herein for brevity.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

In the several embodiments provided in the present application, it should be understood that the disclosed method, method and system may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical, or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. A thermal management system for an electric drive system of an automobile, the thermal management system comprising:

the first cooling loop is used for cooling a motor controller in the electric drive system;

the second cooling loop is used for cooling an electric drive transmission assembly in the electric drive system, and the electric drive transmission assembly comprises a motor and a speed reducer;

wherein the first cooling circuit and the second cooling circuit are independent from each other, and the first cooling circuit and the second cooling circuit are respectively cooled by different cooling components;

the heat management system further comprises a third cooling loop, the third cooling loop comprises a heat exchange device, a refrigerant side and a cooling liquid side of the heat exchange device are respectively positioned in the third cooling loop and the first cooling loop, and the refrigerant flowing through the refrigerant side is used for cooling the cooling liquid flowing through the cooling liquid side;

The first cooling loop comprises a fourth branch, a fifth branch and a sixth branch; the fourth branch comprises a fourth electronic water pump, a third valve and the heat exchange device, the fourth electronic water pump, the third valve and the cooling liquid side of the heat exchange device are connected in series through a pipeline, the fifth branch comprises a motor controller and a fourth valve which are connected in series through a pipeline, the sixth branch comprises a fifth electronic water pump, a battery and a fifth valve which are connected in series through a pipeline, two ends of the fifth branch are respectively connected with two ends of the fourth branch, and the fifth branch is connected in parallel with the sixth branch;

in the case where the third valve and the fourth valve are both configured in a conductive state, the cooling liquid side of the heat exchange device, the fourth electronic water pump, the third valve, the fourth valve, and the motor controller form a first sub-cooling circuit; in the case where the third valve is configured in an off state, the fourth valve and the fifth valve are each configured in an on state, the fifth electronic water pump, the fourth valve, the fifth valve, the motor controller and the battery form a second sub-cooling circuit.

2. A method of thermal management as applied to the thermal management system of claim 1, the method comprising:

detecting whether a cooling requirement exists on the electric drive system;

controlling a first cooling circuit in the thermal management system to cool a motor controller in the electric drive system in response to determining that the motor controller has a cooling demand;

in response to determining that a cooling demand exists for an electric drive assembly in the electric drive system, a second cooling circuit in the thermal management system is controlled to cool the electric drive assembly.

3. The method of claim 2, wherein the thermal management system includes a number of modes of operation, the method further comprising:

determining a target operating mode of the thermal management system, the target operating mode being one of the plurality of operating modes;

the detecting whether a cooling requirement exists for the electric drive system includes:

and judging whether the target device has a cooling requirement or not based on the target working mode and the temperature of the cooling liquid flowing through the target device, wherein the target device is the motor controller or the electric drive assembly.

4. The method of claim 3, wherein, in the case where the target device is the motor controller, the determining whether the target device has a cooling requirement based on the target operation mode and a temperature of the coolant flowing through the target device comprises:

Selecting a temperature threshold corresponding to the target working mode from a first corresponding relation as a first target temperature threshold, wherein the first corresponding relation comprises temperature thresholds respectively corresponding to the working modes;

determining whether a cooling demand exists for the motor controller based on the first target temperature threshold and a temperature of the coolant flowing through the motor controller;

and/or, in the case that the target device is the electric drive assembly, the determining whether the target device has a cooling requirement based on the target operation mode and a temperature of the cooling liquid flowing through the target device includes:

selecting a temperature threshold corresponding to the target working mode from a second corresponding relation as a second target temperature threshold, wherein the second corresponding relation comprises temperature thresholds respectively corresponding to the working modes, and the temperature thresholds corresponding to the same working mode in the first corresponding relation and the second corresponding relation are different;

and determining whether a cooling requirement exists for the electric drive assembly based on the second target temperature threshold and the temperature of the cooling fluid flowing through the electric drive assembly.

5. The method of claim 4, wherein the plurality of operating modes include an energy saving mode, a normal mode, and a motion mode, wherein the temperature threshold corresponding to the energy saving mode is greater than the temperature threshold corresponding to the normal mode, and wherein the temperature threshold corresponding to the normal mode is greater than the temperature threshold corresponding to the motion mode.

6. The method of claim 2, wherein the first cooling circuit includes a target electronic water pump therein, the method further comprising, in the event that a cooling demand exists for the motor controller:

detecting a torque output demand of the vehicle;

controlling an operating gear of the target electronic water pump based on the torque output demand;

the torque output requirement is positively correlated with the rotation speed of the water pump in the running gear of the target electronic water pump.

7. A method of thermal management as applied to the thermal management system of claim 1, the method comprising:

detecting whether cooling requirements exist for the battery and the motor controller;

responding to the simultaneous cooling requirement of the battery and the motor controller, controlling the third valve, the fourth valve and the fifth valve to be in a conducting state at the same time, and controlling the fourth electronic water pump, the fifth electronic water pump and the heat exchange device to operate;

And responding to the condition that the battery does not have a cooling requirement and the motor controller has a cooling requirement, controlling the third valve to be in a cut-off state, controlling the fourth valve and the fifth valve to be in a conduction state, and controlling the fourth electronic water pump and the heat exchange device to be closed and controlling the fifth electronic water pump to operate.

8. An electronic device comprising a memory and a processor coupled to each other,

the memory stores program instructions;

the processor is configured to execute program instructions stored in the memory to implement the method of any one of claims 2-7.

9. A computer readable storage medium for storing program instructions executable by a processor to implement the method of any one of claims 2-7.