阅读说明：本技术 一种节能增程式phev热管理系统 (Energy-saving extended-range PHEV thermal management system ) 是由 吴举茂 卜江华 邓湘 于 2021-08-31 设计创作，主要内容包括：本申请涉及一种节能增程式PHEV热管理系统,涉及电动汽车技术领域,其包括电池循环管路、增程器循环管路、切换装置、电机循环管路和控制器,电池循环管路包括电池包；增程器循环管路包括增程器,并通过电池冷却器与电池循环管路连接；切换装置设于增程器循环管路上,并用于连通和断开增程器循环管路和电池冷却器；电机循环管路包括电机,并通过第一控制阀与电池循环管路连接；控制器与切换装置和第一控制阀连接,并用于根据环境温度,控制切换装置连通或断开增程器循环管路和电池冷却器,以及控制第一控制阀的通断,以利用增程器或电机的余热对电池包加热。本申请可根据环境温度充分利用增程器的热量和电机的热量给电池包加热,同时减少PTC介入。(The application relates to an energy-saving range-extending PHEV thermal management system, which relates to the technical field of electric automobiles and comprises a battery circulation pipeline, a range extender circulation pipeline, a switching device, a motor circulation pipeline and a controller, wherein the battery circulation pipeline comprises a battery pack; the range extender circulating pipeline comprises a range extender and is connected with the battery circulating pipeline through a battery cooler; the switching device is arranged on the range extender circulating pipeline and is used for communicating and disconnecting the range extender circulating pipeline and the battery cooler; the motor circulating pipeline comprises a motor and is connected with the battery circulating pipeline through a first control valve; the controller is connected with the switching device and the first control valve and used for controlling the switching device to connect or disconnect the range extender circulation pipeline and the battery cooler according to the ambient temperature and controlling the on-off of the first control valve so as to heat the battery pack by using the waste heat of the range extender or the motor. This application can be according to ambient temperature make full use of the heat of increasing the journey ware and the heat of motor for the battery package heating, reduces PTC simultaneously and intervenes.)

1. An energy-saving extended-range PHEV thermal management system, characterized by comprising:

a battery circulation line (1) including a battery pack (10);

a range extender circulation line (2) which comprises a range extender (20) and which is connected to the battery circulation line (1) via a battery cooler (3);

a switching device (4) provided on the range extender circulation line (2) and configured to connect and disconnect the range extender circulation line (2) and the battery cooler (3);

a motor circulation line (5) which comprises a motor (50) and which is connected to the battery circulation line (1) via a first control valve (6);

and the controller is connected with the switching device (4) and the first control valve (6) and is used for controlling the switching device (4) to connect or disconnect the range extender circulating pipeline (2) and the battery cooler (3) according to the ambient temperature and controlling the first control valve (6) to be connected or disconnected so as to heat the battery pack (10) by using the waste heat of the range extender (20) or the motor (50).

2. The energy-saving, extended-range PHEV thermal management system of claim 1, wherein:

when the ambient temperature is lower than a first threshold value, the controller controls the switching device (4) to communicate the range extender circulation pipeline (2) and the battery cooler (3) and controls the first control valve (6) to be switched off so as to heat the battery pack (10) by using the waste heat of the range extender (20).

3. The energy-saving, extended-range PHEV thermal management system of claim 2, wherein:

the heat management system further comprises a heater (7), wherein the heater (7) is arranged on the range extender circulating pipeline (2) and is positioned between the range extender (20) and the switching device (4);

when the ambient temperature is lower than a second threshold value which is smaller than the first threshold value, the controller controls the heater (7) to be started and the range extender (20) to be closed, and also controls a switching device (4) to communicate the range extender circulation pipeline (2) and the battery cooler (3) and controls the first control valve (6) to be disconnected so as to heat the battery pack (10) through the heater (7).

4. The energy-saving, extended-range PHEV thermal management system of claim 2, wherein:

when the ambient temperature is lower than a third threshold and is greater than the first threshold, the controller controls the switching device (4) to disconnect the range extender circulation pipeline (2) and the battery cooler (3) and controls the first control valve (6) to be communicated so as to heat the battery pack (10) by using the waste heat of the motor (50).

5. The energy-saving, extended-range PHEV thermal management system of claim 4, wherein:

the motor circulating pipeline (5) also comprises a radiator (51) connected with the motor (50) in series;

when the ambient temperature is lower than a fourth threshold and higher than the third threshold, the controller controls the switching device (4) to disconnect the range extender circulation pipeline (2) and the battery cooler (3), controls the first control valve (6) to be communicated, and controls the radiator (51) to be opened to cool the battery pack (10).

6. The energy-saving, extended-range PHEV thermal management system of claim 5, wherein:

the thermal management system further comprises a first cooling line (8);

when the ambient temperature is lower than the fourth threshold and higher than the third threshold, the controller is also used for controlling the first cooling pipeline (8) to cool the passenger compartment.

7. The energy-saving, extended-range PHEV thermal management system of claim 6, wherein the first cooling line (8) comprises an evaporator (80), a compressor (81) and a condenser (82) in series.

8. The energy-saving, extended-range PHEV thermal management system of claim 6, wherein:

the thermal management system further comprises a second cooling circuit (9); the second cooling pipeline (9) is connected with the first cooling pipeline (8) in parallel, a second control valve (90) is arranged on the second cooling pipeline (9), and the second cooling pipeline (9) is connected with the battery circulating pipeline (1) through the battery cooler (3);

when the ambient temperature is lower than a fifth threshold value, which is greater than the fourth threshold value, the controller controls the switching device (4) to disconnect the range extender circulation line (2) and the battery cooler (3), and controls the first control valve (6) to be disconnected, and controls the second control valve (90) to be opened, so as to cool the battery pack (10) through the first cooling line (8).

9. The energy-saving, extended-range PHEV thermal management system according to claim 1, wherein the switching device (4) is a three-way valve, an inlet and an outlet of which are connected to both ends of the range extender (20), respectively, and another outlet of which is connected to the battery cooler (3).

10. The energy-saving, extended-range PHEV thermal management system of claim 1, wherein:

the motor circulation pipeline (5) further comprises a low-temperature expansion kettle (52), and the battery circulation pipeline further comprises a liquid-gas separator (11);

the first control valve (6) is arranged between the low-temperature expansion kettle (52) and the liquid-gas separator (11) and is used for controlling the connection and disconnection between the low-temperature expansion kettle (52) and the liquid-gas separator (11).

Technical Field

The application relates to the technical field of electric vehicles, in particular to an energy-saving range-extending PHEV thermal management system.

Background

At present, along with the continuous tightening of national oil consumption and emission regulations, more and more host plants are invested in the development of electric vehicles, and for a plug-in hybrid electric vehicle PHEV, the problems that the charge and discharge efficiency of a battery is low in a low-temperature environment, the endurance mileage and the service life of the battery are greatly influenced and the like exist, so that the heat insulation problem of the battery is required to be solved through heat management in the low-temperature environment, and the battery is enabled to work at the normal working temperature of 10-25 ℃.

In the related art, the battery is generally heated by the PTC, but the scheme firstly consumes the electric quantity of the battery, when the vehicle is cold started in a low-temperature environment, the battery cannot provide enough electric quantity for the PTC to heat, so that the sale of the plug-in hybrid electric vehicle PHEV is limited regionally, the PTC also consumes the electric quantity for heating the battery to a great extent, the endurance mileage of the battery is reduced, and the PTC heating in an environment of-30 ℃ is expected to influence over 50% of the total endurance mileage, so that the energy consumption of the vehicle is greatly increased.

Disclosure of Invention

The embodiment of the application provides an energy-saving range-extending PHEV thermal management system, which aims to solve the problem that in the related technology, PTC is adopted to heat a battery, so that the energy consumption of an automobile is greatly increased.

In a first aspect, an energy-saving extended-range PHEV thermal management system is provided, which includes:

a battery circulation line including a battery pack;

the range extender circulating pipeline comprises a range extender and is connected with the battery circulating pipeline through a battery cooler;

the switching device is arranged on the range extender circulating pipeline and is used for communicating and disconnecting the range extender circulating pipeline and the battery cooler;

the motor circulating pipeline comprises a motor and is connected with the battery circulating pipeline through a first control valve;

and the controller is connected with the switching device and the first control valve, and is used for controlling the switching device to connect or disconnect the range extender circulation pipeline and the battery cooler according to the ambient temperature and controlling the on-off of the first control valve so as to heat the battery pack by using the waste heat of the range extender or the motor.

In some embodiments:

when the ambient temperature is lower than a first threshold value, the controller controls the switching device to communicate the range extender circulation pipeline and the battery cooler and controls the first control valve to be disconnected so as to heat the battery pack by using the waste heat of the range extender.

In some embodiments:

the heat management system also comprises a heater, wherein the heater is arranged on the circulation pipeline of the range extender and is positioned between the range extender and the switching device;

when the ambient temperature is lower than a second threshold value, the second threshold value is smaller than the first threshold value, the controller controls the heater to be started and the range extender to be closed, and controls the switching device to be communicated with the range extender circulation pipeline and the battery cooler and controls the first control valve to be disconnected so as to heat the battery pack through the heater.

In some embodiments:

when the ambient temperature is lower than a third threshold and is higher than the first threshold, the controller controls the switching device to disconnect the range extender circulation pipeline and the battery cooler and controls the first control valve to be communicated so as to heat the battery pack by using the waste heat of the motor.

In some embodiments:

the motor circulating pipeline also comprises a radiator connected with the motor in series;

when the ambient temperature is lower than a fourth threshold and higher than a third threshold, the controller controls the switching device to disconnect the range extender circulation pipeline and the battery cooler, controls the first control valve to be communicated, and controls the radiator to be opened to cool the battery pack.

In some embodiments:

the thermal management system also includes a first cooling line;

when the ambient temperature is lower than the fourth threshold and higher than the third threshold, the controller is further configured to control the first cooling pipeline to cool the passenger compartment.

In some embodiments, the first cooling circuit comprises an evaporator, a compressor, and a condenser connected in series.

In some embodiments:

the thermal management system also includes a second cooling circuit; the second cooling pipeline is connected with the first cooling pipeline in parallel, a second control valve is arranged on the second cooling pipeline, and the second cooling pipeline is connected with the battery circulation pipeline through the battery cooler;

when the ambient temperature is lower than a fifth threshold value, which is greater than the fourth threshold value, the controller controls the switching device to disconnect the range extender circulation line and the battery cooler, and controls the first control valve to disconnect, and controls the second control valve to open to cool the battery pack through the first cooling line.

In some embodiments, the switching device is a three-way valve, an inlet and an outlet of the three-way valve are respectively connected to two ends of the range extender, and another outlet of the three-way valve is connected to the battery cooler.

In some embodiments:

the motor circulation pipeline also comprises a low-temperature expansion kettle, and the battery circulation pipeline also comprises a liquid-gas separator;

the first control valve is arranged between the low-temperature expansion kettle and the liquid-gas separator and used for controlling the connection and disconnection between the low-temperature expansion kettle and the liquid-gas separator.

The beneficial effect that technical scheme that this application provided brought includes: under the low-temperature working condition, the energy-saving range-extending PHEV thermal management system can fully utilize the heat of the range extender and the heat of the motor to heat the battery pack according to the ambient temperature, keep the temperature of the battery pack in the optimal working temperature range, prevent the battery capacity from being sharply reduced, reduce the number of PTC (positive temperature coefficient) intervention thermal management systems and greatly reduce the energy consumption of the system.

The embodiment of the application provides an energy-saving extended-range PHEV thermal management system, and aiming at the ambient temperature, the energy-saving extended-range PHEV thermal management system of the embodiment of the application has two heating modes, namely a first heating mode: the thermal management system heats the battery pack by using hot water of the range extender in the range extender circulating pipeline through the battery cooler, so that the temperature of the battery pack in the battery circulating pipeline is at a proper working temperature; a second heating mode: the heat management system heats the battery pack by using hot water of the motor in the motor circulating pipeline, so that the temperature of the battery pack in the battery circulating pipeline is at a proper working temperature, and under a low-temperature working condition, the energy-saving range-extending PHEV heat management system can fully utilize the heat of the range extender and the heat of the motor to heat the battery pack according to the environmental temperature, keep the temperature of the battery pack in an optimal working temperature range, prevent the battery capacity from being sharply reduced, reduce the PTC intervention heat management system and greatly reduce the energy consumption of the system.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an energy-saving extended-range PHEV thermal management system according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a range extender heating battery pack provided in an embodiment of the present application;

fig. 3 is a schematic view of a motor-heated battery pack provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a heat sink cooling battery pack according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a first cooling circuit cooling a passenger compartment according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of a first cooling circuit cooling a passenger compartment and a battery pack according to an embodiment of the present application.

In the figure: 1. a battery circulation line; 10. a battery pack; 11. a liquid-gas separator; 2. a range extender circulation pipeline; 20. a range extender; 3. a battery cooler; 4. a switching device; 5. a motor circulation pipeline; 50. a motor; 51. a heat sink; 52. a low-temperature expansion kettle; 6. a first control valve; 7. a heater; 8. a first cooling line; 80. an evaporator; 81. a compressor; 82. a condenser; 9. a second cooling circuit; 90. a second control valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, an embodiment of the present application provides an energy-saving range-extending PHEV thermal management system, which includes a battery circulation pipeline 1, a range extender circulation pipeline 2, a switching device 4, a motor circulation pipeline 5, and a controller, where the battery circulation pipeline 1 includes a battery pack 10; the range extender circulation pipeline 2 comprises a range extender 20 and is connected with the battery circulation pipeline 1 through the battery cooler 3; the switching device 4 is arranged on the range extender circulating pipeline 2 and is used for communicating and disconnecting the range extender circulating pipeline 2 and the battery cooler 3; the motor circulation pipeline 5 comprises a motor 50 and is connected with the battery circulation pipeline 1 through a first control valve 6; the controller is connected with the switching device 4 and the first control valve 6, and is used for controlling the switching device 4 to connect or disconnect the range extender circulation pipeline 2 and the battery cooler 3 according to the ambient temperature, and controlling the on-off of the first control valve 6 so as to heat the battery pack 10 by using the waste heat of the range extender 20 or the motor 50.

The working principle of the energy-saving range-extending PHEV thermal management system in the embodiment of the application is as follows:

aiming at the ambient temperature, the energy-saving extended-range PHEV thermal management system has two heating modes, namely a first heating mode: the thermal management system heats the battery pack 10 by using hot water of the range extender 20 in the range extender circulating pipeline 2 through the battery cooler, so that the temperature of the battery pack 10 in the battery circulating pipeline 1 is at a proper working temperature; a second heating mode: the thermal management system heats the battery pack 10 by using the hot water of the motor 50 in the motor circulation pipeline 5, so that the temperature of the battery pack 10 in the battery circulation pipeline 1 is at a proper working temperature.

Therefore, under a low-temperature working condition, the energy-saving range-extending PHEV thermal management system according to the embodiment of the application can fully utilize the heat of the range extender 20 and the heat of the motor 50 to heat the battery pack 10 according to the ambient temperature, keep the temperature of the battery pack 10 in the optimal working temperature range, prevent the battery capacity from being sharply reduced, reduce the PTC intervention thermal management system, and greatly reduce the energy consumption of the system.

The heat exchange plate arranged on the battery cooler 3 in the embodiment of the present application forms a flow channel for circulating a refrigerant, and is used for performing heat exchange; the range extender 20 is an integrated assembly of a small engine and a generator, and corresponds to a small generator.

Alternatively, referring to fig. 2, when the ambient temperature is lower than the first threshold, the controller controls the switching device 4 to connect the range extender circulation line 2 and the battery cooler 3, and controls the first control valve 6 to be disconnected, so as to heat the battery pack 10 by using the waste heat of the range extender 20.

The first threshold of the embodiment of the present application is set to-20 ℃, and in the cold winter in the north, under the condition that the ambient temperature is very low, when the user starts the vehicle, the temperature of the range extender 20 rises faster than the temperature of the motor 50, so that, under such a working condition, the hot water of the range extender 20 is used to heat the battery pack 10 through the battery cooler 3, so that the temperature of the battery pack 10 is at the appropriate working temperature. The embodiment of the application fully utilizes the residual heat of the range extender 20 to heat the battery pack 10, keeps the temperature of the battery pack 10 in the optimal working temperature range, and prevents the battery capacity from being rapidly reduced.

Preferably, referring to fig. 2, the thermal management system further includes a heater 7, and the heater 7 is disposed on the range extender circulation pipeline 2 and located between the range extender 20 and the switching device 4; when the ambient temperature is lower than a second threshold value which is smaller than the first threshold value, the controller controls the heater 7 to be started, the range extender 20 to be closed, the switching device 4 to be communicated with the range extender circulation pipeline 2 and the battery cooler 3, and the first control valve 6 to be disconnected so as to heat the battery pack 10 through the heater 7.

The second threshold value of the embodiment of the application is less than-20 ℃, the heater 7 is the PTC, the temperature of the range extender 20 rises slowly at the ambient temperature, and no waste heat is used for heating the battery pack 10, so that the heater 7 can be used for heating the battery pack 10, the PTC is closed after the battery pack 10 rises, the range extender 20 heats the battery pack 10, and the PTC is not required to be used for heating the battery pack 10 simply all the time, so that the energy is saved.

Alternatively, referring to fig. 3, when the ambient temperature is lower than the third threshold and higher than the first threshold, the controller controls the switching device 4 to disconnect the range extender circulation line 2 and the battery cooler 3 and controls the first control valve 6 to be communicated, so as to heat the battery pack 10 by using the waste heat of the motor 50.

The third threshold of the embodiment of the present application is set to 10 ℃, and when the ambient temperature is between-20 ℃ and 10 ℃, the temperature of the motor 50 rises faster than the range extender 20, so that the hot water of the motor 50 is used to heat the battery pack 10, so that the temperature of the battery pack 10 in the battery circulation pipeline 1 is at the appropriate working temperature.

Preferably, as shown in fig. 4, the motor circulation line 5 further comprises a radiator 51 connected in series with the motor 50; when the ambient temperature is lower than the fourth threshold value and higher than the third threshold value, the controller controls the switching device 4 to disconnect the range extender circulation line 2 and the battery cooler 3 and controls the first control valve 6 to be communicated and the radiator 51 to be opened to cool the battery pack 10.

The fourth threshold value of the embodiment of the present application is 25 ℃, and when the ambient temperature is between 10 ℃ and 25 ℃, the battery pack 10 and the motor 50 are cooled by using the radiator 51 of the motor circulation pipeline 5, so that the temperature of the battery pack 10 is at the appropriate working temperature. This operation mode battery cooler 3 does not participate in cooling of the battery pack 10, thereby saving power.

Further, as shown in fig. 5, the thermal management system further includes a first cooling circuit 8; when the ambient temperature is lower than the fourth threshold and higher than the third threshold, the controller is further configured to control the first cooling circuit 8 to cool the passenger compartment.

The fourth threshold value of the embodiment of the application is 25 ℃, when the ambient temperature is between 10 ℃ and 25 ℃, the first cooling pipeline 8 is used for cooling the passenger compartment, and in the working mode, the air conditioner only cools the passenger compartment, so that the electricity is saved.

Further, the first cooling circuit 8 includes an evaporator 80, a compressor 81, and a condenser 82 in series in this order.

Preferably, as shown in fig. 6, the thermal management system further comprises a second cooling circuit 9; the second cooling pipeline 9 is connected with the first cooling pipeline 8 in parallel, a second control valve 90 is arranged on the second cooling pipeline 9, and the second cooling pipeline 9 is connected with the battery circulation pipeline 1 through the battery cooler 3; when the ambient temperature is lower than the fifth threshold, which is greater than the fourth threshold, the controller controls the switching device 4 to disconnect the range extender circulation line 2 and the battery cooler 3, and controls the first control valve 6 to be disconnected, and controls the second control valve 90 to be opened to cool the battery pack 10 through the first cooling line 8.

The fifth threshold value of the embodiment of the application is set to be 30 ℃, when the ambient temperature is 25-30 ℃, the temperature of the battery pack 10 is high, the battery pack 10 and the motor 50 are cooled only by the radiator 51, and the efficiency is low, so that under the working condition, the battery pack 10 is cooled by the air conditioner firstly, and after the temperature of the battery pack 10 is reduced, the battery pack 10 and the motor 50 are cooled by the radiator 51.

Further, the switching device 4 is a three-way valve, an inlet and an outlet of the three-way valve are respectively connected to two ends of the range extender 20, and the other outlet of the three-way valve is connected to the battery cooler 3.

When the circulation pipeline 2 of the range extender needs to heat the battery pack 10 by using the battery cooler 3, opening the channels 1-3 and closing the channels 1-2 of the three-way valve; when the range extender circulating pipeline 2 is not needed to heat the battery pack 10 by using the battery cooler 3, the channels 1-2 and the channels 1-3 of the three-way valve are opened and closed.

Further, the motor circulation pipeline 5 also comprises a low-temperature expansion kettle 52, and the battery circulation pipeline also comprises a liquid-gas separator 11; the first control valve 6 is arranged between the low-temperature expansion kettle 52 and the liquid-gas separator 11 and is used for controlling the on-off between the low-temperature expansion kettle 52 and the liquid-gas separator 11.

The first control valve 6 is a two-way valve, which can make the medium in the motor circulation pipeline 5 flow into the battery circulation pipeline 1 to cool the battery pack 10, and the medium flows out of the first control valve 6 into the motor circulation pipeline 5 to complete the heat circulation.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.