阅读说明：本技术 一种热管理系统 (Thermal management system ) 是由 张爱文 王亚超 张艳芳 纪雨时 于 2021-01-21 设计创作，主要内容包括：本发明公开了一种热管理系统,涉及电动车技术领域。该热管理系统包括第一换热回路、第二换热回路及回路切换组件。所述第一换热回路包括第一管道及被所述第一管道串联设置的第一水泵、第一加热器、冷却组件及动力电池；所述第二换热回路包括第二管道及被所述第二管道串联设置的第二水泵、第二加热器及暖风芯体；所述回路切换组件能够在所述第一换热回路和所述第二换热回路分别独立运行的独立模式与所述第一换热回路和所述第二换热回路串联运行串联模式两种状态之间切换。该热管理系统能够通过切换两个换热回路的独立与串联模式,降低加热器功率,从而降低成本及重量。(The invention discloses a thermal management system, and relates to the technical field of electric vehicles. The heat management system comprises a first heat exchange loop, a second heat exchange loop and a loop switching assembly. The first heat exchange loop comprises a first pipeline, and a first water pump, a first heater, a cooling assembly and a power battery which are arranged in series by the first pipeline; the second heat exchange loop comprises a second pipeline, and a second water pump, a second heater and a warm air core body which are arranged in series by the second pipeline; the loop switching assembly can be switched between an independent mode in which the first heat exchange loop and the second heat exchange loop respectively and independently operate and a series mode in which the first heat exchange loop and the second heat exchange loop operate in series. The heat management system can reduce the power of the heater by switching the independent and series modes of the two heat exchange loops, thereby reducing the cost and the weight.)

1. A thermal management system, comprising:

the first heat exchange loop (1) comprises a first pipeline (11), and a first water pump (12), a first heater (13), a cooling assembly (14) and a power battery (15) which are arranged in series by the first pipeline (11), wherein a heat exchange medium flows in the first pipeline (11);

the second heat exchange loop (2) comprises a second pipeline (21), and a second water pump (22), a second heater (23) and a hot air core body (24) which are arranged in series by the second pipeline (21), wherein the heat exchange medium flows in the second pipeline (21);

the loop switching assembly can switch between an independent mode that the first heat exchange loop (1) and the second heat exchange loop (2) respectively operate independently and a series mode that the first heat exchange loop (1) and the second heat exchange loop (2) operate in series.

2. The thermal management system according to claim 1, characterized in that said first heat exchange circuit (1) further comprises a third conduit connected in parallel with said cooling assembly (14) and with said power cell (15).

3. The thermal management system of claim 2, wherein the circuit switching assembly comprises a five-way valve (3), the five-way valve (3) comprising:

a housing (31), the housing (31) connecting both ends of the first pipe (11), both ends of the second pipe (21), and one end of the third pipe;

the rotating piece (32) is rotatably arranged in the shell (31), the rotating piece (32) is provided with two pipelines (321), and when the first heat exchange loop (1) and the second heat exchange loop (2) are in an independent mode, the two pipelines (321) are respectively communicated with two ends of the first pipeline (11) and two ends of the second pipeline (21); when the first heat exchange loop (1) and the second heat exchange loop (2) are in a series mode, one of the pipelines (321) is communicated with one end of the first pipeline (11) and one end of the second pipeline (21), and the other pipeline (321) is communicated with the other end of the second pipeline (21) and one end of the third pipeline.

4. The thermal management system of claim 1, wherein the warm air core (24) has a plurality of spaced apart fins.

5. The thermal management system of claim 1, wherein the first heater (13) and the second heater (23) are ptc (positive Temperature coefficient) heaters.

6. The thermal management system of claim 1, wherein one of the first heater (13) and the second heater (23) is a heat pump mechanism.

7. The thermal management system according to claim 6, wherein the heat pump mechanism comprises a compressor, an evaporator, a throttle valve and a condenser, the compressor, the evaporator, the throttle valve and the condenser are connected in sequence to form a circulating heat exchange loop, and a circulating working medium flows in the circulating heat exchange loop:

the condenser is connected with the first pipeline (11) in a heat exchange manner;

the compressor is used for compressing the circulating working medium in the circulating heat exchange loop.

8. The thermal management system of claim 1, wherein the cooling assembly (14) comprises:

the heat taking end is in heat exchange connection with the first pipeline (11);

a coolant flowing through the take-off end and absorbing heat from the take-off end.

9. The thermal management system according to any of claims 1-8, further comprising a temperature sensor capable of sensing the temperature of the warm air core (24) and the power battery (15).

10. The thermal management system according to claim 9, further comprising a control component electrically connected to the temperature sensor, wherein the control component can control the opening and closing of the first heater (13) and the second heater (23) according to the temperature sensed by the temperature sensor, and can control the circuit switching component to switch the independent mode and the series mode of the first heat exchange circuit (1) and the second heat exchange circuit (2).

Technical Field

The invention relates to the technical field of electric vehicles, in particular to a thermal management system.

Background

In order to accelerate the world to sustainable energy conversion and reduce the dependence on fossil fuels, new energy automobiles, especially pure electric automobiles, develop at a high speed in recent years, and various traditional automobile enterprises and novel automobile enterprises join in competition ranks. However, for the development of the heat management system of a pure electric vehicle, most vehicle types only start from meeting requirements, the waste heat utilization and energy management of the whole vehicle are not good enough, the heat management system is not designed according to different requirements of heating components of the whole vehicle, and the waste heat of the system cannot be utilized to the maximum extent. The energy density of the conventional power battery is low, and the waste of the system waste heat causes that the electric energy of the power battery is needed to provide heat supply for the automobile, so that the endurance mileage of the pure electric automobile is seriously influenced.

In the existing pure electric vehicle, when a power battery is charged at a low temperature, a heater is required to be used for heating the power battery, so that the power battery is charged at a proper temperature, and the service life and the charging speed of the power battery can be ensured. And the pure electric vehicle warm air system also needs the heater to provide heat, and then can blow out warm air to achieve the heating purpose. In order to provide enough heat for the warm air system, the heater of the warm air system needs high power, which results in increased cost, and the high-power heater also increases weight, further reducing the endurance mileage of the pure electric vehicle.

In view of the above problems, it is desirable to develop a thermal management system to solve the problems of increased cost and weight caused by separately providing a high power heater for a heating system.

Disclosure of Invention

The invention aims to provide a thermal management system which can reduce the power of a heater by switching the independent and series modes of two heat exchange loops, thereby reducing the cost and the weight.

In order to achieve the purpose, the invention adopts the following technical scheme:

a thermal management system, comprising:

the first heat exchange loop comprises a first pipeline, and a first water pump, a first heater, a cooling assembly and a power battery which are arranged in series by the first pipeline, wherein a heat exchange medium flows in the first pipeline;

the second heat exchange loop comprises a second pipeline, and a second water pump, a second heater and a warm air core which are arranged in series by the second pipeline, wherein the heat exchange medium flows in the second pipeline;

the loop switching assembly can be switched between an independent mode in which the first heat exchange loop and the second heat exchange loop respectively and independently operate and a series mode in which the first heat exchange loop and the second heat exchange loop are connected in series and operate.

Preferably, the first heat exchange loop further comprises a third pipeline, and the third pipeline is connected with the cooling assembly and the power battery in parallel.

Preferably, the circuit switching assembly includes a five-way valve, the five-way valve including:

a housing connected to both ends of the first pipe, both ends of the second pipe, and one end of the third pipe;

the rotating piece is rotatably arranged in the shell and provided with two pipelines, and when the first heat exchange loop and the second heat exchange loop are in an independent mode, the two pipelines are respectively communicated with two ends of the first pipeline and two ends of the second pipeline; when the first heat exchange loop and the second heat exchange loop are in a series mode, one pipeline is communicated with one end of the first pipeline and one end of the second pipeline, and the other pipeline is communicated with the other end of the second pipeline and one end of the third pipeline.

Preferably, a plurality of radiating fins are arranged on the warm air core body at intervals.

Preferably, the first heater and the second heater are ptc (positive Temperature coefficient) heaters.

Preferably, one of the first heater and the second heater is a heat pump mechanism.

Preferably, the heat pump mechanism includes a compressor, an evaporator, a throttle valve and a condenser, the compressor, the evaporator, the throttle valve and the condenser are connected in sequence to form a circulation heat exchange loop, and a circulation working medium flows in the circulation heat exchange loop:

the condenser is in heat exchange connection with the first pipeline;

the compressor is used for compressing the circulating working medium in the circulating heat exchange loop.

Preferably, the cooling assembly comprises:

the heat taking end is in heat exchange connection with the first pipeline;

a coolant flowing through the take-off end and absorbing heat from the take-off end.

Preferably, the temperature sensor is further included, and the temperature sensor can sense the temperatures of the warm air core body and the power battery.

Preferably, the heat exchanger further comprises a control assembly, the control assembly is electrically connected with the temperature sensor, the control assembly can control the opening and closing of the first heater and the second heater according to the temperature sensed by the temperature sensor, and can control the loop switching assembly to switch the independent mode and the series mode of the first heat exchange loop and the second heat exchange loop.

The invention has the beneficial effects that:

the invention provides a thermal management system. In the heat management system, a first heat exchange loop is a power battery heating system, and a second heat exchange loop is a hot air conditioning system. The first heater can not work during driving because the power battery heating usually starts to work when the power battery is stopped for charging and the first heater is used for providing a proper charging temperature for the power battery. And in the running process, the second heater of the second heat exchange loop provides heat for the warm air core body, and then the hot air is blown into the passenger cabin. Because the heat management system is provided with the loop switching assembly, the two heat exchange loops can be switched between the independent mode and the series mode, and the second heater can be selected to have lower power. When the power of the second heater cannot meet the heating requirement of the air conditioner, the second heater can be switched to a series mode, and the first heater is started to provide heat for the air conditioner at the same time. Compared with the traditional heater for heating the air conditioner, the power of the second heater of the heat management system is greatly reduced, the cost is reduced, and meanwhile, the weight of the pure electric vehicle is reduced due to the small size of the low-power second heater.

Drawings

FIG. 1 is a schematic diagram of a thermal management system according to the present invention operating in a standalone mode;

FIG. 2 is a schematic diagram of a thermal management system according to the present invention operating in a series mode.

In the figure:

1. a first heat exchange loop; 2. a second heat exchange loop; 3. a five-way valve;

11. a first conduit; 12. a first water pump; 13. a first heater; 14. a cooling assembly; 15. a power battery; 21. a second conduit; 22. a second water pump; 23. a second heater; 24. a warm air core body; 31. a housing; 32. a rotating member;

321. a pipeline.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The present embodiments provide a thermal management system. As shown in fig. 1 and 2, the thermal management system includes a first heat exchange loop 1, a second heat exchange loop 2 and a loop switching assembly. The first heat exchange loop 1 comprises a first pipeline 11, a first water pump 12, a first heater 13, a cooling assembly 14 and a power battery 15, wherein the first water pump, the first heater, the cooling assembly 14 and the power battery are connected in series through the first pipeline 11, and a heat exchange medium flows in the first pipeline 11. The second heat exchange loop 2 comprises a second pipeline 21, and a second water pump 22, a second heater 23 and a warm air core 24 which are arranged in series by the second pipeline 21, wherein a heat exchange medium flows in the second pipeline 21. The loop switching assembly can be switched between an independent mode in which the first heat exchange loop 1 and the second heat exchange loop 2 operate independently respectively and a series mode in which the first heat exchange loop 1 and the second heat exchange loop 2 operate in series.

The first heat exchange loop 1 can heat the power battery 15, so that the power battery 15 maintains a proper charging temperature during charging. The second heat exchange loop 2 can heat the warm air core body 24 to provide warm air for the passenger compartment. And the loop switching component can enable the first heat exchange loop 1 and the second heat exchange loop 2 to be switched between an independent mode and a series mode, when the loop switching component is switched to the independent mode, the second heater 23 can singly heat the warm air core 24, and when the loop switching component is switched to the series mode, the first heater 13 and the second heater 23 can jointly heat the warm air core 24. This allows the use of the standalone mode to conserve energy when the passenger compartment is not in high demand for heat, and the tandem mode to provide more heat to the passenger compartment when the passenger compartment is in high demand for heat. Due to the existence of the loop switching assembly, the second heater 23 can be a heater with lower power, so that the material cost is greatly reduced, and meanwhile, the low-power heater is light in weight, so that the weight of a pure electric vehicle can be reduced, and the energy consumption is further reduced.

Preferably, the first heat exchange loop 1 further comprises a third pipeline, and the third pipeline is connected in parallel with the cooling assembly 14 and the power battery 15.

The optimal working temperature range of the power battery 15 is 25-45 ℃, a warm air system of an air conditioner can provide enough heat when water is heated to more than 90 ℃, if the first heat exchange loop 1 and the second heat exchange loop 2 are directly connected in series, the power battery 15 can be overheated, and therefore a third pipeline is arranged to cut off the water flow passing through the power battery 15. Because the automobile does not need to supply heat for the power battery 15 in the running process, in order to prevent hot water from passing through the power battery 15, one ends of the power battery 15 and the cooling assembly 14 are provided with switch valves, and when the loop switching assembly controls the first heat exchange loop 1 and the second heat exchange loop 2 to be in a series mode, the switch valves can close a branch of the power battery 15 and the cooling assembly 14.

Preferably, the circuit switching assembly includes a five-way valve 3, the five-way valve 3 includes a housing 31 and a rotating member 32, and the housing 31 connects two ends of the first pipe 11, two ends of the second pipe 21, and one end of the third pipe. The rotating member 32 is rotatably disposed in the housing 31, the rotating member 32 is provided with two pipelines 321, and when the first heat exchange circuit 1 and the second heat exchange circuit 2 are in an independent mode, the two pipelines 321 are respectively communicated with two ends of the first pipeline 11 and two ends of the second pipeline 21; when the first heat exchange circuit 1 and the second heat exchange circuit 2 are in series mode, one pipe 321 communicates one end of the first pipe 11 with one end of the second pipe 21, and the other pipe 321 communicates the other end of the second pipe 21 with one end of the third pipe.

The housing 31 is provided with five openings, A, B, C, D and E respectively, wherein a and B communicate with both ends of the first duct 11, C and D communicate with both ends of the second duct 21, and E communicates with one end of the third duct. As shown in fig. 1, one pipe 321 of the rotating member 32 is connected to a and B, and the other pipe 321 is connected to C and D, and the first heat exchange circuit 1 and the second heat exchange circuit 2 are in independent mode. When the heat of the warm air needs to be increased, the rotating member 32 can be rotated, as shown in fig. 2, so that one pipeline 321 is communicated with B and C, the other pipeline 321 is communicated with D and E, the first heat exchange circuit 1 and the second heat exchange circuit 2 are switched to be in a series mode, and the first heater 13 and the second heater 23 are used for providing heat for the warm air core 24 together.

Preferably, a plurality of heat dissipation fins are arranged on the warm air core 24 at intervals. The heat exchange area is enlarged by utilizing the plurality of radiating fins, so that the temperature of the gas blown over the hot air core body 24 is rapidly increased, and the efficiency is improved.

Preferably, the first heater 13 and the second heater 23 are PTC heaters. Because the power source of the pure electric vehicle is the power battery 15, in order to simplify the design structure, the PTC heater can directly convert the electric energy into the heat energy to supply heat for the power battery 15 and the warm air core body 24, and no additional energy source is required to be designed.

The battery pack is limited by the weight requirement and size of the pure electric vehicle, the energy of the power battery 15 is precious, the PTC heater is directly used for heating, the electric energy of the power battery 15 is consumed, the endurance mileage of the pure electric vehicle is seriously shortened, and the user experience is reduced. To solve this problem, one of the first heater 13 and the second heater 23 is a heat pump mechanism.

The heat pump mechanism comprises a compressor, an evaporator, a throttle valve and a condenser, wherein the compressor, the evaporator, the throttle valve and the condenser are sequentially connected to form a circulating heat exchange loop, and circulating working media flow in the circulating heat exchange loop. The condenser is connected with the first pipeline 11 in a heat exchange manner. The compressor is used for compressing the circulating working medium in the circulating heat exchange loop.

The circulating working medium absorbs heat in the evaporator to evaporate, is compressed into high-temperature gas when flowing through the compressor and flows to the condenser, the heat is released in the condenser to heat the warm air core body 24 or the power battery 15, the high-temperature gas is liquefied and cooled to release a large amount of heat in the process, and the warm air core body 24 or the power battery 15 is guaranteed to be heated. When the liquefied circulating working medium flows through the throttle valve, the pressure is reduced, so that the circulating working medium is easier to gasify, and preparation is provided for the circulating working medium to flow into the evaporator to absorb heat.

Preferably, the cooling assembly 14 includes a heat extraction end and a cooling fluid. The heat extraction end is connected with the first pipeline 11 in a heat exchange mode, and the cooling liquid flows through the heat extraction end and absorbs heat of the heat extraction end. The cooling assembly 14 cools the first pipeline 11 through the cooling liquid, and then the cooling liquid flows to the heat dissipation assembly to discharge heat, so that the temperature of the power battery 15 is not too high, and the power battery 15 is in a proper temperature range.

The cooling liquid can also be used by matching with a compressor, which is equivalent to reverse installation of a heat pump mechanism, the heat taking end is an evaporator, the heat radiating component is a condenser, and the cooling liquid is a circulating working medium, so that heat in the first pipeline 11 is transferred to the circulating working medium through the evaporator and is transferred to the outside from the condenser.

In order to adjust the heating power of the first heater 13 and the second heater 23, the thermal management system further includes a temperature sensor capable of sensing the temperature of the warm air core 24 and the temperature of the power battery 15.

Preferably, the thermal management system further comprises a control component, the control component is electrically connected with the temperature sensor, the first heater 13 and the second heater 23 can be controlled to be opened and closed according to the temperature sensed by the temperature sensor, and the loop switching component can be controlled to switch the independent mode and the series mode of the first heat exchange loop 1 and the second heat exchange loop 2.

When the temperature sensor senses that the temperature of the power battery 15 reaches the proper temperature range, the control component can control the first heater 13 to be turned off to save energy. When the temperature in the passenger cabin reaches the preset temperature of the warm air conditioner, the control assembly can control the second heater 23 to be turned off so as to save energy and guarantee the endurance of the pure electric vehicle. And if the preset temperature of the passenger compartment is higher, the warm air core body 24 is heated only by the second heater 23, the temperature rises slowly, at the moment, the control component can control the loop switching component to switch the first heat exchange loop 1 and the second heat exchange loop 2 into a series mode, and simultaneously the first heater 13 and the second heater 23 are switched on to heat the warm air core body 24 together, so that the heating efficiency is improved.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.