CN115352241A - Thermal management system and method for a new energy vehicle - Google Patents

Abstract

The present invention relates to the technical field of new energy vehicles, in particular to a thermal management system for new energy vehicles. The system includes: a refrigerant assembly, an outdoor cooling module, a passenger compartment cooling branch, a passenger compartment heating branch, and an electric battery branch and the drive motor branch; the refrigerant assembly is connected to the outdoor cooling module through the passenger compartment cooling branch, the passenger cabin heating branch and the electric battery branch respectively, and the outdoor cooling module is connected to the refrigerant assembly through the driving motor branch, and the outdoor cooling module is also connected to the cooling medium assembly through the driving motor branch. It is connected with the refrigerant assembly, the heating branch of the passenger compartment is connected with the electric battery branch, and the cooling branch of the passenger compartment and the electric battery branch are both connected with the drive motor branch. The system is a single refrigerant circuit, which improves the working efficiency of the thermal management system, reduces the parts and pipelines in the thermal management system, reduces the difficulty of the layout of the vehicle parts, the assembly difficulty and work intensity of the vehicle on-line, and increases the design of the thermal management system. and versatility.

Description

Thermal management system and method for a new energy vehicle

technical field

The invention relates to the technical field of new energy vehicles, in particular to a thermal management system and method for new energy vehicles.

Background technique

At present, the energy crisis and environmental protection issues are rapidly promoting the rapid transformation of the automobile industry from the traditional fuel-powered model to the new energy model, especially the rapid transformation to the pure electric drive model. Compared with traditional cars, new energy vehicles have more component assemblies, such as drive motors, power batteries, and on-board chargers. Through the thermal management system of the whole vehicle, these electric parts of the new energy vehicle can be guaranteed to work normally, thereby improving the safety and power economy of the whole vehicle. Therefore, the thermal management system is an important part of new energy vehicles.

The existing thermal management system of new energy vehicles uses the joint action of the refrigerant circuit and the coolant circuit. The cooling function of the drive motor and high-voltage components, the cooling function and heating function of the power battery are all realized through the coolant circuit. The refrigerant circuit is responsible for the cooling and heating functions of the air conditioner, as well as the heat exchange with the coolant circuit in various modes.

However, the existing thermal management system contains more components and pipelines, and the existing thermal management system requires the water-cooled condenser and the battery heater to exchange heat with the refrigerant circuit, resulting in more heat loss, causing the existing thermal management system to The problem of low work efficiency.

Contents of the invention

The embodiment of the present invention solves the technical problem of low working efficiency of the thermal management system in the prior art by providing a thermal management system and method for a new energy vehicle, and realizes the use of a single refrigerant circuit to improve the working efficiency of the thermal management system , Simplify the thermal management system, reduce the parts and pipelines in the thermal management system, reduce the difficulty of the layout of the vehicle parts, the assembly difficulty and work intensity of the vehicle on the line, and increase the design and versatility of the thermal management system and other technical effects.

In the first aspect, an embodiment of the present invention provides a thermal management system for a new energy vehicle, including: a refrigerant assembly, an outdoor cooling module, a passenger compartment cooling branch, a passenger compartment heating branch, an electric battery branch and a drive motor branch road;

The refrigerant assembly communicates with the outdoor heat dissipation module through the passenger compartment cooling branch, the passenger compartment heating branch and the electric battery branch respectively, and the outdoor heat dissipation module communicates with the drive motor branch The refrigerant assembly, the outdoor cooling module is also in communication with the refrigerant assembly, the passenger compartment heating branch is in communication with the electric battery branch, the passenger compartment cooling branch is in communication with the electric battery branch The roads are all in communication with the drive motor branch.

Preferably, the refrigerant assembly includes: an air-conditioning compressor and a gas-liquid separator, the outlet of the gas-liquid separator is connected to the inlet of the air-conditioning compressor.

Preferably, the passenger compartment refrigeration branch includes: a one-way valve, an evaporator and a first electronic expansion valve;

One end of the evaporator is connected to the first port of the first electronic expansion valve, the other end of the evaporator is connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to the first port of the first cut-off valve. The first port is connected, the second port of the first cut-off valve is connected to the outlet of the air conditioner compressor, the second port of the first electronic expansion valve is connected to the outdoor cooling module and the drive motor branch respectively connected.

Preferably, the passenger compartment heating branch includes: a condenser and an air-heated PTC heater;

One end of the condenser is connected to the first port of the first shut-off valve, the other end of the condenser is connected to the first port of the second shut-off valve, and the second port of the second shut-off valve is connected to the The outdoor cooling module is connected;

The air-heated PTC heater is arranged in the passenger compartment heating branch, and is used for air-heating the passenger compartment during the heating process of the passenger compartment of the vehicle.

Preferably, the electric battery branch circuit includes: a third cut-off valve, a fourth cut-off valve, a fifth cut-off valve, a sixth cut-off valve, an electric battery and a second electronic expansion valve;

One end of the electric battery is respectively connected to the first port of the third cut-off valve and the first port of the sixth cut-off valve, and the other end of the electric battery is connected to the first port of the fourth cut-off valve , the second port of the third shut-off valve is connected to the first port of the first shut-off valve, the second port of the sixth shut-off valve is connected to the drive motor branch and the inlet of the gas-liquid separator The pipeline connection between;

The second port of the fourth cut-off valve is respectively connected to the first port of the fifth cut-off valve and the first port of the second electronic expansion valve, and the second port of the fifth cut-off valve is connected to the first port of the first electronic expansion valve. The first ports of the two cut-off valves are connected, and the second port of the second electronic expansion valve communicates with the drive motor branch.

Preferably, the drive motor branch circuit includes: a drive motor assembly and a third electronic expansion valve;

The first port of the third electronic expansion valve is respectively connected to the second port of the first electronic expansion valve, the outdoor cooling module and the second port of the second electronic expansion valve, and the third electronic expansion valve The second port of the valve is connected to one end of the driving motor assembly, and the other end of the driving motor assembly is respectively connected to the second port of the sixth shut-off valve and the inlet of the gas-liquid separator.

Preferably, the outdoor cooling module includes: a heat exchanger and a fan;

One end of the heat exchanger is respectively connected to the first port of the seventh shut-off valve and the second port of the second shut-off valve, and the other end of the heat exchanger is connected to the first port of the third electronic expansion valve connected, the second port of the seventh cut-off valve is connected with the second port of the first cut-off valve;

The position of the fan corresponds to the heat exchanger, and is used to dissipate heat from the heat exchanger.

Based on the same inventive concept, in the second aspect, the present invention also provides a thermal management method for a new energy vehicle, which is applied to the above thermal management system for a new energy vehicle, and the method includes:

Obtain an activation command for the thermal management system of the vehicle;

If it is detected that the start command is the start command of the first mode, enter the first mode, wherein the first mode includes: at least one of passenger compartment cooling mode, electric battery cooling mode and driving motor cooling mode kind;

In the first mode, the heating branch of the passenger compartment is controlled to be in the disconnected state, and the refrigerant is discharged through the refrigerant assembly, and the refrigerant is passed through the outdoor heat dissipation module to form a cooled first refrigerant, and then the second refrigerant is discharged A refrigerant is respectively transmitted to the cooling branch circuit of the passenger compartment, the electric battery branch circuit and the drive motor branch circuit.

Preferably, after obtaining the activation instruction of the thermal management system of the vehicle, it also includes:

If it is detected that the start command is the start command of the second mode, enter the second mode, wherein the second mode includes: passenger compartment heating mode, electric battery heating mode and the drive motor cooling mode at least one of

In the second mode, control the passenger compartment cooling branch, the pipeline between the refrigerant assembly and the outdoor heat dissipation module, and the pipeline between the electric battery branch and the driving motor branch The pipelines are all disconnected, and the refrigerant is discharged through the refrigerant assembly, and the refrigerant is respectively passed through the passenger compartment heating branch and the electric battery branch to obtain mixed refrigerant, and The mixed refrigerant passes through the outdoor cooling module to form a cooled second refrigerant, and then transmits the second refrigerant to the drive motor branch circuit.

Preferably, after obtaining the activation instruction of the thermal management system of the vehicle, it also includes:

If it is detected that the start command is the start command of the third mode, enter the third mode, wherein the third mode includes: the passenger compartment heating mode, the electric battery cooling mode and the driving at least one of the motor cooling modes;

In the third mode, control the passenger compartment cooling branch, the pipeline between the refrigerant assembly and the outdoor heat dissipation module, and the passenger compartment heating branch and the electric battery branch The pipelines between them are all disconnected, and the refrigerant is discharged through the refrigerant assembly, and the refrigerant is transmitted to the outdoor heat dissipation module through the passenger compartment heating branch to obtain the cooled first Three refrigerants, and then transmit the third refrigerant to the electric battery branch and the driving motor branch respectively.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

An embodiment of the present invention provides a thermal management system for a new energy vehicle, including: a refrigerant assembly, an outdoor cooling module, a passenger compartment cooling branch, a passenger compartment heating branch, an electric battery branch and a drive motor branch. The refrigerant assembly is connected to the outdoor heat dissipation module through the passenger compartment cooling branch, the passenger compartment heating branch and the electric battery branch, the outdoor heat dissipation module is connected to the refrigerant assembly through the drive motor branch, and the outdoor heat dissipation module is also connected to the refrigerant assembly. The passenger compartment heating branch is connected with the electric battery branch, and the passenger compartment cooling branch and the electric battery branch are both connected with the driving motor branch.

Therefore, the thermal management system of the embodiment of the present invention is a single refrigerant circuit, canceling the cooling liquid circuit, reducing the parts and pipelines that need to be arranged, increasing the integration of the thermal management system, and breaking the limitation of the layout height of the cooling liquid circuit. The applicability of the thermal management system is enhanced, and it can be widely applied to various platform models and skateboard floors. While streamlining the layout of parts and pipelines, the thermal management system also reduces the layout space, reduces the difficulty of assembly on the production line, and speeds up the production cycle. Moreover, the thermal management system cancels the heat exchange between the cooling liquid and the refrigerant, shortens the pipeline length of the thermal management system, thereby reducing heat loss and improving the working efficiency of the thermal management system.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same components are represented by the same reference figures. In the attached picture:

FIG. 1 shows a schematic structural view of a thermal management system of a new energy vehicle in an embodiment of the present invention;

Fig. 2 shows another schematic structural view of the thermal management system of the new energy vehicle in the embodiment of the present invention;

Fig. 3 shows a schematic structural diagram of the first mode of the thermal management system of the new energy vehicle in the embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of the second mode of the thermal management system of the new energy vehicle in the embodiment of the present invention;

Fig. 5 shows a schematic structural diagram of the third mode of the thermal management system of the new energy vehicle in the embodiment of the present invention;

Fig. 6 shows a schematic flow chart of steps of a thermal management method for a new energy vehicle in an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

Embodiment one

The first embodiment of the present invention provides a thermal management system for a new energy vehicle, as shown in FIG. 1 , including: a refrigerant assembly 110 , an outdoor cooling module 120 , a passenger compartment cooling branch 130 , and a passenger compartment heating branch 140 , the electric battery branch 150 and the driving motor branch 160 . The refrigerant assembly 110 is connected to the outdoor heat dissipation module 120 through the passenger compartment cooling branch 130, the passenger compartment heating branch 140 and the electric battery branch 150 respectively, and the outdoor heat dissipation module 120 is connected to the refrigerant assembly 110 through the drive motor branch 160, and the outdoor heat dissipation The module 120 is also in communication with the refrigerant assembly 110 , the passenger compartment heating branch 140 is in communication with the electric battery branch 150 , and the passenger compartment cooling branch 130 and the electric battery branch 150 are both in communication with the drive motor branch 160 .

Specifically, in FIG. 1, the first port of the passenger compartment cooling branch 130, the first port of the passenger compartment heating branch 140, the first port of the electric battery branch 150, and the first port of the outdoor heat dissipation module 120 are all It is connected to the first port of the refrigerant assembly 110; the second port of the passenger compartment heating branch 140 and the second port of the electric battery branch 150 are both connected to the first port of the outdoor cooling module 120; the passenger compartment cooling branch 130 Both the second port of the outdoor cooling module 120 and the second port of the outdoor cooling module 120 are connected to the first port of the drive motor branch circuit 160 .

The first port of the electric battery branch circuit 150 is also connected with the second port of the drive motor branch circuit 160, and the second port of the electric battery branch circuit 150 is also connected with the first port of the drive motor branch circuit 160, and the drive motor branch circuit 160 The second port is connected to the second port of the refrigerant assembly 110 .

The refrigerant assembly 110 is related equipment for discharging high-temperature refrigerant, and the high-temperature refrigerant is a refrigerant with a temperature range of 70-100°C. The outdoor cooling module 120 is related equipment for cooling the high-temperature refrigerant to form a low-temperature refrigerant, wherein the temperature range of the low-temperature refrigerant is 2-3°C. The passenger compartment cooling branch 130 is used for cooling the passenger compartment of the vehicle, the passenger compartment heating branch 140 is used for heating the passenger compartment of the vehicle, and the electric battery branch 150 is used for heating or cooling the electric battery of the vehicle, driving The motor branch 160 is used for cooling the drive motor of the vehicle.

The heat management system of the new energy vehicle in this embodiment includes: a refrigerant assembly 110 , an outdoor cooling module 120 , a passenger compartment cooling branch 130 , a passenger compartment heating branch 140 , an electric battery branch 150 and a drive motor branch 160 . By controlling the refrigerant circuit formed between the refrigerant assembly 110, the outdoor heat dissipation module 120, the passenger compartment cooling branch 130, the passenger compartment heating branch 140, the electric battery branch 150 and the driving motor branch 160, the vehicle occupant The heating and cooling functions of the cabin, the heating and cooling functions of the electric battery, and the cooling functions of the driving motor.

The thermal management system is a single refrigerant circuit, canceling the coolant circuit, reducing the parts and pipelines that need to be arranged, increasing the integration of the thermal management system, and breaking the limitation of the layout height of the cooling liquid circuit, making the thermal management system applicable Enhanced performance, can be widely applied to various platform models and skateboard floors. While streamlining the layout of parts and pipelines, the thermal management system also reduces the layout space, reduces the difficulty of assembly on the production line, and speeds up the production cycle. Moreover, the thermal management system cancels the heat exchange between the cooling liquid and the refrigerant, shortens the pipeline length of the thermal management system, thereby reducing heat loss and improving the working efficiency of the thermal management system.

It should be noted that FIG. 2 is another schematic structural diagram of the thermal management system of this embodiment.

Below, the specific implementation steps of the thermal management system of the new energy vehicle provided by this embodiment will be introduced in detail in conjunction with FIG. 1 and FIG. 2:

The refrigerant assembly 110 includes: an air conditioner compressor 111 and a gas-liquid separator 112 . The air conditioner compressor 111 is used to discharge the high-temperature refrigerant, and the gas-liquid separator 112 is used to separate the gaseous refrigerant and the liquid refrigerant, so that the gaseous refrigerant is transmitted to the air conditioner compressor 111 . The outlet of the gas-liquid separator 112 is connected to the inlet of the air-conditioning compressor 111 , the outlet of the air-conditioning compressor 111 is the first port of the refrigerant assembly 110 , and the inlet of the gas-liquid separator 112 is the second port of the refrigerant assembly 110 .

The cooling branch circuit 130 for the passenger compartment includes: a check valve 131 , an evaporator 132 and a first electronic expansion valve 133 . One end of the evaporator 132 is connected to the first port of the first electronic expansion valve 133, the other end of the evaporator 132 is connected to the inlet of the one-way valve 131, and the outlet of the one-way valve 131 is connected to the first port of the first stop valve 171 , the second port of the first cut-off valve 171 is connected to the outlet of the air conditioner compressor 111, and the second port of the first electronic expansion valve 133 is respectively connected to the second port of the outdoor cooling module 120 and the first port of the drive motor branch circuit 160 .

The outlet of the one-way valve 131 is the first port of the passenger compartment cooling branch circuit 130, the second port of the first electronic expansion valve 133 is the second port of the passenger compartment cooling branch circuit 130, and the first port of the passenger compartment cooling branch circuit 130 is It is connected to the first port of the refrigerant assembly 110 through the first stop valve 171 .

The passenger compartment heating branch 140 includes: a condenser 141 and an air-heated PTC heater 142, wherein the condenser 141 is an indoor condenser, that is, the air conditioner HVAC (Heating Ventilation and Air Conditioning, for heat ventilation and air conditioning) system. One end of the condenser 141 is connected to the first port of the first shut-off valve 171, the other end of the condenser 141 is connected to the first port of the second shut-off valve 172, and the second port of the second shut-off valve 172 is connected to the outdoor cooling module 120. The first port is connected. The air-heating PTC heater 142 is arranged in the passenger compartment heating branch 140 , and is used for air-heating the passenger compartment during the heating process of the vehicle's passenger compartment.

One end of the condenser 141 is the first port of the passenger compartment heating branch 140, the other end of the condenser 141 is the second port of the passenger compartment heating branch 140, and one end of the condenser 141 is connected with the refrigerant through the first cut-off valve 171. The first port of the assembly 110 is connected, and the other end of the condenser 141 is connected to the first port of the outdoor cooling module 120 through the second stop valve 172 .

The electric battery branch circuit 150 includes: a third cut-off valve 173 , a fourth cut-off valve 174 , a fifth cut-off valve 175 , a sixth cut-off valve 176 , an electric battery 151 and a second electronic expansion valve 152 . One end of the electric battery 151 is connected with the first port of the third shut-off valve 173 and the first port of the sixth shut-off valve 176 respectively, and the other end of the electric battery 151 is connected with the first port of the fourth shut-off valve 174, and the third shut-off valve The second port of 173 is connected to the first port of the first shut-off valve 171 , and the second port of the sixth shut-off valve 176 is connected to the second port of the drive motor branch circuit 160 .

The second port of the fourth cut-off valve 174 is respectively connected to the first port of the fifth cut-off valve 175 and the first port of the second electronic expansion valve 152 , and the second port of the fifth cut-off valve 175 is connected to the first port of the second cut-off valve 172 . One port is connected, the second port of the second electronic expansion valve 152 is connected with the first port of the drive motor branch circuit 160 .

One end of the electric battery 151 is the first port of the electric battery branch circuit 150 , and one end of the electric battery 151 is connected to the first port of the refrigerant assembly 110 through the third stop valve 173 and the first stop valve 171 in sequence. The other end of the electric battery 151 is the second port of the electric battery branch circuit 150, and the other end of the electric battery 151 passes through the fourth shut-off valve 174, the fifth shut-off valve 175 and the second shut-off valve 172 and the first port of the outdoor cooling module 120 in sequence. The other end of the electric battery 151 is connected to the second port of the drive motor branch circuit 160 through the fourth cut-off valve 174 and the second electronic expansion valve 152 in sequence.

The drive motor branch circuit 160 includes: a drive motor assembly 161 and a third electronic expansion valve 162 , wherein the drive motor assembly 161 includes a drive motor and related high-voltage components. The first port of the third electronic expansion valve 162 is respectively connected to the second port of the first electronic expansion valve 133 , the second port of the outdoor cooling module 120 and the second port of the second electronic expansion valve 152 , and the third electronic expansion valve 162 The second port of the drive motor assembly 161 is connected to one end, and the other end of the drive motor assembly 161 is connected to the second port of the sixth stop valve 176 and the inlet of the gas-liquid separator 112 respectively.

The first port of the third electronic expansion valve 162 is the first port of the drive motor branch 160 , and the other end of the drive motor assembly 161 is the second port of the drive motor branch 160 .

The outdoor cooling module 120 includes: a heat exchanger 121 and a fan 122 , wherein the heat exchanger 121 is an outdoor heat exchanger, that is, a radiator arranged at the front end of the cabin of the vehicle. One end of the heat exchanger 121 is connected with the first port of the seventh shut-off valve 177 and the second port of the second shut-off valve 172 respectively, the other end of the heat exchanger 121 is connected with the first port of the drive motor branch 160, and the seventh The second port of the shutoff valve 177 is connected to the second port of the first shutoff valve 171 . The position of the fan 122 corresponds to the heat exchanger 121 and is used for dissipating heat from the heat exchanger 121 .

One end of the heat exchanger 121 is the first port of the outdoor cooling module 120 , and the other end of the heat exchanger 121 is the second port of the outdoor cooling module 120 .

In this embodiment, the thermal management system is a single refrigerant circuit, canceling the cooling liquid circuit, reducing the parts and pipelines that need to be arranged, increasing the integration of the thermal management system, and breaking the limitation of the layout height of the cooling liquid circuit, so that The applicability of the thermal management system is enhanced, and it can be widely applied to various platform models and skateboard floors. While streamlining the layout of parts and pipelines, the thermal management system also reduces the layout space, reduces the difficulty of assembly on the production line, and speeds up the production cycle. Moreover, the thermal management system cancels the heat exchange between the cooling liquid and the refrigerant, shortens the pipeline length of the thermal management system, thereby reducing heat loss and improving the working efficiency of the thermal management system.

Next, the application method applied to the thermal management system of the new energy vehicle of this embodiment will be introduced in detail.

Under the condition that the thermal management system is in the first mode, the passenger compartment heating branch 140 is controlled to be in the disconnected state, and the refrigerant is discharged through the refrigerant assembly 110, and the refrigerant passes through the outdoor heat dissipation module 120 to form the cooled first refrigerant. Then, the cooled first refrigerant is transmitted to the passenger compartment refrigeration branch circuit 130 , the electric battery branch circuit 150 and the driving motor branch circuit 160 respectively. Wherein, the first mode includes: at least one of a passenger compartment cooling mode, an electric battery cooling mode, and a drive motor cooling mode.

Specifically, as shown in FIG. 3 , in the first mode, the first cut-off valve 171 , the second cut-off valve 172 and the fifth cut-off valve 175 are controlled to be in the disconnected state, and the passenger compartment heating branch 140 in FIG. 3 They are connected by dotted lines to realize the step of controlling the passenger compartment heating branch 140 to be in the disconnected state. The high-temperature refrigerant is discharged through the air conditioner compressor 111 . The high-temperature refrigerant is transferred to the heat exchanger 121 through the seventh stop valve 177 to form a low-temperature and low-pressure liquid refrigerant, that is, the cooled refrigerant, which is denoted as the first refrigerant. Wherein, the heat exchanger 121 is used to cool the high-temperature refrigerant to a low-temperature and low-pressure liquid refrigerant.

Then, divide the first refrigerant into three paths. The first refrigerant sequentially passes through the first electronic expansion valve 133, the evaporator 132, the one-way valve 131, the third stop valve 173, the sixth stop valve 176, the gas-liquid separator 112 and the air conditioner compressor 111 to form a passenger compartment refrigeration circuit. In order to realize the cooling mode of the passenger compartment, that is, to cool the passenger compartment.

The first refrigerant passes through the second electronic expansion valve 152, the fourth stop valve 174, the electric battery 151, the sixth stop valve 176, the gas-liquid separator 112, and the air conditioner compressor 111 in order to form a cooling circuit for the electric battery, so as to realize the cooling of the electric battery 151. The cooling mode is to cool down the electric battery 151 .

The first refrigerant passes through the third electronic expansion valve 162, the drive motor assembly 161, the gas-liquid separator 112, and the air conditioner compressor 111 in order to form a drive motor cooling circuit to realize the drive motor cooling mode, that is, to cool down the drive motor.

It should also be noted that after the first refrigerant is divided into three circuits, the passenger compartment refrigeration circuit, the electric battery cooling circuit and the drive motor cooling circuit are respectively formed. Control of the one-way loop is performed by controlling the shut-off valve and/or the electronic expansion valve in the three loops. For example, if the fourth cut-off valve 174 is controlled to be in the disconnected state, the electric battery cooling circuit is in the disconnected state, and the passenger compartment cooling circuit and the driving motor cooling circuit are executed.

Under the condition that the thermal management system is in the second mode, control the cooling branch circuit 130 of the passenger compartment, the pipeline between the refrigerant assembly 110 and the outdoor cooling module 120 and the pipeline between the electric battery branch circuit 150 and the drive motor branch circuit 160 All circuits are disconnected, and the refrigerant is discharged through the refrigerant assembly 110, and the refrigerant is respectively passed through the passenger compartment heating branch 140 and the electric battery branch 150 to obtain mixed refrigerant, and the mixed refrigerant is passed through the outdoor heat dissipation module 120 , forming a cooled second refrigerant, and then transporting the cooled second refrigerant to the drive motor branch circuit 160 . Wherein, the second mode includes at least one of a passenger compartment heating mode, an electric battery heating mode, and a drive motor cooling mode.

Specifically, as shown in FIG. 4, in the second mode, the sixth cut-off valve 176, the seventh cut-off valve 177, the first electronic expansion valve 133, and the second electronic expansion valve 152 are controlled to be in the disconnected state. The passenger compartment cooling branch 130, the pipeline between the refrigerant assembly 110 and the outdoor cooling module 120, and the pipeline between the electric battery branch 150 and the driving motor branch 160 are connected in a dotted line to realize the passenger compartment cooling branch. The pipeline 130, the pipeline between the refrigerant assembly 110 and the outdoor cooling module 120, and the pipeline between the electric battery branch 150 and the drive motor branch 160 are all disconnected. The high-temperature refrigerant is discharged through the air conditioner compressor 111 . The high-temperature refrigerant is transmitted to the passenger compartment heating branch 140 and the electric battery branch 150 through the first cut-off valve 171 .

The high-temperature refrigerant is divided into two paths, passing through the passenger compartment heating branch 140 and the electric battery branch 150 respectively. The high-temperature refrigerant passes through the first cut-off valve 171 and sequentially passes through the condenser 141 and the second cut-off valve 172 to form a passenger compartment heating circuit, so as to realize the passenger compartment heating mode, that is, to heat the passenger compartment. The high-temperature refrigerant passes through the first cut-off valve 171 and passes through the third cut-off valve 173, the electric battery 151, the fourth cut-off valve 174, the fifth cut-off valve 175 and the second cut-off valve 172 to form an electric battery heating circuit to realize the electric battery heating mode , that is, the electric battery 151 is heated.

After the high-temperature refrigerant passes through the passenger compartment heating branch 140 and the electric battery branch 150 respectively, the high-temperature refrigerant joins in the second cut-off valve 172 to form a mixed refrigerant. The mixed refrigerant is delivered to the heat exchanger 121 through the second stop valve 172 . The mixed refrigerant passes through the heat exchanger 121 to form a cooled refrigerant, which is referred to as the second refrigerant. Then the second refrigerant is delivered to the drive motor branch circuit 160 . The second refrigerant passes through the third electronic expansion valve 162, the drive motor assembly 161, the gas-liquid separator 112, and the air conditioner compressor 111 in order to form a drive motor cooling circuit to realize the drive motor cooling mode, that is, to cool down the drive motor.

It should also be noted that the high-temperature refrigerant is divided into two paths, which pass through the passenger compartment heating branch 140 and the electric battery branch 150 respectively. The control of the one-way circuit is performed by controlling the shut-off valve and/or the electronic expansion valve in the gauge circuit. For example, if the third cut-off valve 173 is controlled to be in the disconnected state, the electric battery heating circuit is in the disconnected state, and the passenger compartment heating circuit is executed.

Under the condition that the thermal management system is in the third mode, control the passenger compartment cooling branch 130 , the pipeline between the refrigerant assembly 110 and the outdoor heat dissipation module 120 , and the connection between the passenger compartment heating branch 140 and the electric battery branch 150 The pipelines between are all disconnected, and the refrigerant is discharged through the refrigerant assembly 110, and the refrigerant is transmitted to the outdoor heat dissipation module 120 through the passenger compartment heating branch 140 to obtain the cooled third refrigerant, and then the cooled The third refrigerant is transmitted to the electric battery branch circuit 150 and the drive motor branch circuit 160 respectively. Wherein, the third mode includes: at least one of a passenger compartment heating mode, an electric battery cooling mode, and a driving motor cooling mode.

Specifically, as shown in FIG. 5 , in the third mode, the third cut-off valve 173 , the fifth cut-off valve 175 , the seventh cut-off valve 177 and the first electronic expansion valve 133 are controlled to be in the disconnected state. The passenger compartment cooling branch 130, the pipeline between the refrigerant assembly 110 and the outdoor heat dissipation module 120, and the pipeline between the passenger compartment heating branch 140 and the electric battery branch 150 are connected by dotted lines to realize the passenger compartment The cooling branch circuit 130, the pipeline between the refrigerant assembly 110 and the outdoor heat dissipation module 120, and the pipeline between the passenger compartment heating branch circuit 140 and the electric battery branch circuit 150 are all disconnected.

The high-temperature refrigerant is discharged through the air conditioner compressor 111 . The high-temperature refrigerant is transmitted to the passenger compartment heating branch 140 through the first cut-off valve 171 . That is, the high-temperature refrigerant passes through the first shut-off valve 171 and sequentially passes through the condenser 141 and the second shut-off valve 172 to form a passenger compartment heating circuit to realize the passenger compartment heating mode, that is, to heat the passenger compartment.

The high-temperature refrigerant is transmitted to the heat exchanger 121 after passing through the passenger compartment heating branch 140 . The high-temperature refrigerant passes through the heat exchanger 121 to form a cooled refrigerant, which is denoted as the third refrigerant. Then the third refrigerant is divided into two paths, passing through the electric battery branch circuit 150 and the driving motor branch circuit 160 respectively.

Here, the third refrigerant passes through the second electronic expansion valve 152, the fourth stop valve 174, the electric battery 151, the sixth stop valve 176, the gas-liquid separator 112, and the air conditioner compressor 111 in order to form a cooling circuit for the electric battery to realize The cooling mode of the electric battery 151 is to cool down the electric battery 151 .

The third refrigerant passes through the third electronic expansion valve 162, the drive motor assembly 161, the gas-liquid separator 112, and the air conditioner compressor 111 in order to form a drive motor cooling circuit to realize the drive motor cooling mode, that is, to cool down the drive motor.

It should also be noted that after the third refrigerant is divided into two circuits, the electric battery cooling circuit and the driving motor cooling circuit are respectively formed. Control of the one-way circuit is performed by controlling the shut-off valve and/or the electronic expansion valve in the two circuits. For example, if the third electronic expansion valve 162 is controlled to be in an off state, the driving motor cooling circuit is in an off state, and the electric battery cooling circuit is executed.

In this embodiment, through the cold medium in the thermal management system, as well as the outdoor cooling module 120, the passenger compartment cooling branch 130, the passenger compartment heating branch 140, the electric battery branch 150 and the drive motor branch in the thermal management system Road 160 realizes the cooling mode of the passenger compartment, the heating mode of the passenger compartment, the cooling mode of the electric battery, the heating mode of the electric battery and the cooling mode of the driving motor. Therefore, by simplifying the principle of the thermal management system, adopting a single refrigerant circuit, reducing the layout of parts and pipelines, increasing the versatility of the heat pump system on different models, and improving the working efficiency of the thermal management system.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

This embodiment provides a thermal management system for a new energy vehicle, including: a refrigerant assembly, an outdoor cooling module, a passenger compartment cooling branch, a passenger compartment heating branch, an electric battery branch and a drive motor branch. The refrigerant assembly is connected to the outdoor heat dissipation module through the passenger compartment cooling branch, the passenger cabin heating branch and the electric battery branch, the outdoor heat dissipation module is connected to the refrigerant assembly through the drive motor branch, and the outdoor heat dissipation module is also connected to the refrigerant assembly. The passenger compartment heating branch is connected with the electric battery branch, and the passenger compartment cooling branch and the electric battery branch are both connected with the driving motor branch.

Therefore, the thermal management system of this embodiment is a single refrigerant circuit, canceling the cooling liquid circuit, reducing the parts and pipelines that need to be arranged, increasing the integration of the thermal management system, and breaking the limitation of the layout height of the cooling liquid circuit, so that The applicability of the thermal management system is enhanced, and it can be widely applied to various platform models and skateboard floors. While streamlining the layout of parts and pipelines, the thermal management system also reduces the layout space, reduces the difficulty of assembly on the production line, and speeds up the production cycle. Moreover, the thermal management system cancels the heat exchange between the cooling liquid and the refrigerant, shortens the pipeline length of the thermal management system, thereby reducing heat loss and improving the working efficiency of the thermal management system.

Embodiment two

Based on the same inventive concept, the second embodiment of the present invention also provides a thermal management method for a new energy vehicle, as shown in FIG. 6 , including:

S201, acquiring an activation instruction of the thermal management system of the vehicle;

S202. Enter the first mode if it is detected that the activation command is the activation command of the first mode, wherein the first mode includes: passenger compartment cooling mode, electric battery cooling mode and drive motor cooling mode at least one;

S203. In the first mode, control the heating branch of the passenger compartment to be in the disconnected state, discharge the refrigerant through the refrigerant assembly, pass the refrigerant through the outdoor heat dissipation module to form the cooled first refrigerant, and then discharge the refrigerant The above-mentioned first refrigerant is transmitted to the passenger compartment cooling branch, the electric battery branch and the driving motor branch respectively.

As an optional embodiment, after acquiring the activation instruction of the thermal management system of the vehicle, the method further includes:

If it is detected that the start command is the start command of the second mode, enter the second mode, wherein the second mode includes: passenger compartment heating mode, electric battery heating mode and the drive motor cooling mode at least one of

In the second mode, control the passenger compartment cooling branch, the pipeline between the refrigerant assembly and the outdoor heat dissipation module, and the pipeline between the electric battery branch and the driving motor branch The pipelines are all disconnected, and the refrigerant is discharged through the refrigerant assembly, and the refrigerant is respectively passed through the passenger compartment heating branch and the electric battery branch to obtain mixed refrigerant, and The mixed refrigerant passes through the outdoor cooling module to form a cooled second refrigerant, and then transmits the second refrigerant to the drive motor branch circuit.

As an optional embodiment, after acquiring the activation instruction of the thermal management system of the vehicle, the method further includes:

If it is detected that the start command is the start command of the third mode, enter the third mode, wherein the third mode includes: the passenger compartment heating mode, the electric battery cooling mode and the driving at least one of the motor cooling modes;

In the third mode, control the passenger compartment cooling branch, the pipeline between the refrigerant assembly and the outdoor heat dissipation module, and the passenger compartment heating branch and the electric battery branch The pipelines between them are all disconnected, and the refrigerant is discharged through the refrigerant assembly, and the refrigerant is transmitted to the outdoor heat dissipation module through the passenger compartment heating branch to obtain the cooled first Three refrigerants, and then transmit the third refrigerant to the electric battery branch and the driving motor branch respectively.

Since the thermal management method of the new energy vehicle introduced in this embodiment is the method adopted in implementing the thermal management system of the new energy vehicle in the first embodiment of the present invention, based on the thermal management method of the new energy vehicle introduced in the first embodiment of the present invention Management system, those skilled in the art can understand the specific implementation of the thermal management method of the new energy vehicle in this embodiment and its various variations, so how to implement the embodiment of the present invention for the thermal management method of the new energy vehicle The system in No. 1 will not be introduced in detail. As long as those skilled in the art implement the method adopted by the thermal management system of the new energy vehicle in Embodiment 1 of the present invention, it all falls within the protection scope of the present invention.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a Means for realizing the functions specified in one or more steps of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1. A thermal management system of a new energy automobile is characterized by comprising: the system comprises a refrigerant assembly, an outdoor heat dissipation module, a passenger compartment refrigerating branch, a passenger compartment heating branch, an electric battery branch and a driving motor branch;

the refrigerant assembly is communicated with the outdoor heat dissipation module through the passenger compartment refrigeration branch, the passenger compartment heating branch and the electric battery branch respectively, the outdoor heat dissipation module is communicated with the refrigerant assembly through the driving motor branch, the outdoor heat dissipation module is communicated with the refrigerant assembly, the passenger compartment heating branch is communicated with the electric battery branch, and the passenger compartment refrigeration branch and the electric battery branch are communicated with the driving motor branch.

2. The system of claim 1, wherein the coolant assembly comprises: the air conditioner comprises an air conditioner compressor and a gas-liquid separator, wherein the outlet of the gas-liquid separator is connected with the inlet of the air conditioner compressor.

3. The system of claim 2, wherein the passenger compartment refrigeration branch comprises: the system comprises a one-way valve, an evaporator and a first electronic expansion valve;

one end of the evaporator is connected with a first port of the first electronic expansion valve, the other end of the evaporator is connected with an inlet of the one-way valve, an outlet of the one-way valve is connected with a first port of a first stop valve, a second port of the first stop valve is connected with an outlet of the air-conditioning compressor, and a second port of the first electronic expansion valve is respectively communicated with the outdoor heat dissipation module and the driving motor branch.

4. The system of claim 3, wherein the passenger compartment heating branch comprises: a condenser and a wind-heating PTC heater;

one end of the condenser is connected with a first port of the first stop valve, the other end of the condenser is connected with a first port of a second stop valve, and a second port of the second stop valve is communicated with the outdoor heat dissipation module;

the air heating PTC heater is arranged in the heating branch of the passenger compartment and used for heating the passenger compartment in an air heating process of the passenger compartment of the vehicle.

5. The system of claim 4, wherein the electric battery branch comprises: the third stop valve, the fourth stop valve, the fifth stop valve, the sixth stop valve, the electric battery and the second electronic expansion valve;

one end of the electric battery is connected with a first port of the third stop valve and a first port of the sixth stop valve respectively, the other end of the electric battery is connected with a first port of the fourth stop valve, a second port of the third stop valve is connected with a first port of the first stop valve, and a second port of the sixth stop valve is communicated with a pipeline between the driving motor branch and an inlet of the gas-liquid separator;

and a second port of the fourth stop valve is respectively connected with a first port of the fifth stop valve and a first port of the second electronic expansion valve, a second port of the fifth stop valve is connected with a first port of the second stop valve, and a second port of the second electronic expansion valve is communicated with the driving motor branch.

6. The system of claim 5, wherein the drive motor branch comprises: the driving motor assembly and the third electronic expansion valve;

the first port of the third electronic expansion valve is connected with the second port of the first electronic expansion valve, the outdoor heat dissipation module and the second port of the second electronic expansion valve respectively, the second port of the third electronic expansion valve is connected with one end of the driving motor assembly, and the other end of the driving motor assembly is connected with the second port of the sixth stop valve and the inlet of the gas-liquid separator respectively.

7. The system of claim 6, wherein the outdoor heat sink module comprises: a heat exchanger and a fan;

one end of the heat exchanger is respectively connected with a first port of a seventh stop valve and a second port of the second stop valve, the other end of the heat exchanger is connected with a first port of the third electronic expansion valve, and a second port of the seventh stop valve is connected with a second port of the first stop valve;

the position of the fan corresponds to the heat exchanger and is used for dissipating heat of the heat exchanger.

8. The method for heat management of the new energy automobile is applied to the heat management system of the new energy automobile according to any one of claims 1 to 7, and the method comprises the following steps:

obtaining a starting instruction of a thermal management system of a vehicle;

if the starting instruction is detected to be a starting instruction of a first mode, entering the first mode, wherein the first mode comprises the following steps; at least one of a passenger compartment cooling mode, an electric battery cooling mode, and a drive motor cooling mode;

in the first mode, the heating branch of the passenger cabin is controlled to be in a disconnected state, the refrigerant is discharged through the refrigerant assembly, the refrigerant passes through the outdoor heat dissipation module to form a first cooled refrigerant, and then the first cooled refrigerant is respectively transmitted to the refrigerating branch of the passenger cabin, the electric battery branch and the driving motor branch.

9. The method of claim 8, after obtaining the start instruction for the thermal management system of the vehicle, further comprising:

if the starting instruction is detected to be a starting instruction of a second mode, entering the second mode, wherein the second mode comprises: at least one of a passenger compartment heating mode, an electric battery heating mode, and the drive motor cooling mode;

in the second mode, the passenger compartment refrigeration branch, a pipeline between the refrigerant assembly and the outdoor heat dissipation module and a pipeline between the electric battery branch and the driving motor branch are controlled to be in a disconnected state, the refrigerant is discharged through the refrigerant assembly, the refrigerant respectively passes through the passenger compartment heating branch and the electric battery branch to obtain a mixed refrigerant, the mixed refrigerant passes through the outdoor heat dissipation module to form a cooled second refrigerant, and the second refrigerant is transmitted to the driving motor branch.

10. The method of claim 8, after obtaining the start instruction for the thermal management system of the vehicle, further comprising:

if the starting instruction is detected to be a starting instruction of a third mode, entering the third mode, wherein the third mode comprises: at least one of the passenger compartment heating mode, the electric battery cooling mode, and the drive motor cooling mode;

in the third mode, the passenger compartment refrigeration branch, the pipeline between the refrigerant assembly and the outdoor heat dissipation module and the pipeline between the passenger compartment heating branch and the electric battery branch are controlled to be in a disconnected state, the refrigerant is discharged through the refrigerant assembly, the refrigerant is transmitted into the outdoor heat dissipation module through the passenger compartment heating branch to obtain a cooled third refrigerant, and then the third refrigerant is transmitted into the electric battery branch and the driving motor branch respectively.

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