CN109489283B - Battery pack cooling system and battery pack structure - Google Patents
Battery pack cooling system and battery pack structure Download PDFInfo
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- CN109489283B CN109489283B CN201811384943.3A CN201811384943A CN109489283B CN 109489283 B CN109489283 B CN 109489283B CN 201811384943 A CN201811384943 A CN 201811384943A CN 109489283 B CN109489283 B CN 109489283B
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- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims abstract description 191
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- 238000009834 vaporization Methods 0.000 claims description 2
- 230000008016 vaporization Effects 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims 2
- 230000009471 action Effects 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The application provides a battery pack cooling system and a battery pack structure, wherein the system comprises a refrigerant pipeline, an electronic expansion valve, a compressor and a condenser; the refrigerant pipeline comprises a plurality of pipe groups, the pipe groups are arranged on the surface of the battery pack, and the refrigerant pipeline comprises an input port, an output port and a pipeline positioned between the input port and the output port; the input port is connected with the electronic expansion valve through an interface; the output port is connected with the compressor through an interface; the compressor is connected with the electronic expansion valve through a condenser. The refrigerant pipeline, the electronic expansion valve, the compressor and the condenser form a circulation loop for circulating a refrigerant, and the refrigerant is in a gas-liquid mixing state when entering the refrigerant pipeline and being output from the refrigerant pipeline under the action of the electronic expansion valve, so that the temperature of the whole refrigerant pipeline is consistent, no temperature difference exists, the whole battery pack is at the same temperature, and the service life of the battery pack is prevented from being reduced due to overlarge temperature difference.
Description
Technical Field
The application relates to the field of power batteries, in particular to a battery pack cooling system and a battery pack structure.
Background
In recent years, as the problems of energy cost and environmental pollution are more and more prominent, the pure electric vehicles and hybrid electric vehicles receive attention from governments and various automobile enterprises due to the advantage that the pure electric vehicles and hybrid electric vehicles can greatly eliminate even zero discharge of automobile exhaust. However, pure electric vehicles and hybrid electric vehicles still have many technical problems to be broken through, and the service life and capacity attenuation of batteries are one of the important problems.
The service life and capacity decay of the battery are closely related to the temperature difference and temperature rise amplitude of the battery system. The power battery can produce a large amount of heats at the during operation, if this heat can not in time be discharged, will make the temperature in the power battery constantly rise, cause its inside temperature difference to increase gradually, and finally the power battery will be in the operational environment of big difference in temperature, influences power battery's life. Particularly, in hot summer, the temperature of the natural environment is very high, and if the power battery cannot be effectively cooled in time, the final working temperature of the power battery is far higher than the reasonable working temperature of the power battery, so that the service life and the battery capacity of the power battery are seriously influenced, and meanwhile, the discharge performance of the power battery is greatly interfered.
Disclosure of Invention
In order to solve the above problems, embodiments of the present application provide a battery pack cooling system and a battery pack structure.
In a first aspect, an embodiment of the present application provides a battery pack cooling system, where the system includes a refrigerant pipeline, an electronic expansion valve, a compressor, and a condenser;
the refrigerant pipeline comprises a plurality of pipe groups, the pipe groups are arranged on the surface of the battery pack, and the refrigerant pipeline comprises an input port, an output port and a pipeline positioned between the input port and the output port;
the input port is connected with the electronic expansion valve through an interface; the output port is connected with the compressor through an interface; the compressor is connected with the electronic expansion valve through a condenser;
the refrigerant arranged in the refrigerant pipeline is partially evaporated into a gaseous refrigerant after passing through the refrigerant pipeline, the gaseous refrigerant is mixed with the liquid refrigerant which is not evaporated and then enters the compressor, and the compressor heats and pressurizes the gaseous refrigerant in the compressor;
the refrigerant in a gas-liquid mixed state output from the compressor is liquefied into a liquid refrigerant after passing through the condenser, and the liquid refrigerant is partially gasified after passing through the electronic expansion valve and becomes in a gas-liquid mixed state;
the refrigerant pipeline evaporates part of liquid refrigerant of the refrigerant in a gas-liquid mixed state, so that the refrigerant is in a gas-liquid mixed state after being output from an output port of the refrigerant pipeline, and the circulation of the refrigerant is completed.
Optionally, in this embodiment, the system further comprises a back pressure valve,
the output port is connected with the back pressure valve through an interface, the back pressure valve is connected with the compressor, and the back pressure valve is used for controlling the pressure value of the refrigerant pipeline to enable the refrigerant pipeline to be in a high-pressure state, so that the evaporation temperature of the refrigerant is increased, and the generation of condensed water is reduced.
Optionally, in this embodiment, the system further includes a gas-liquid separator:
the inlet of the gas-liquid separator is connected with the back pressure valve, the outlet of the gas-liquid separator is respectively connected with the compressor and the inlet of the refrigerant pipeline, wherein the gas-liquid separator is used for performing gas-liquid separation on the refrigerant in a gas-liquid mixed state, the gaseous refrigerant is conveyed to the compressor for heating and pressurizing operation, and the liquid refrigerant is directly conveyed to the inlet of the refrigerant pipeline.
Optionally, in this embodiment, the system further includes an electronic pump: the electronic pump is arranged between the gas-liquid separator and the refrigerant pipeline and is used for pumping the liquid refrigerant after gas-liquid separation into an inlet of the refrigerant pipeline.
Optionally, in this embodiment, the electronic expansion valve controls a portion of refrigerant in the electronic expansion valve to be vaporized, so that the refrigerant is not completely vaporized in the refrigerant pipeline.
Optionally, in this embodiment, the refrigerant pipeline is made of a heat conductive metal.
Optionally, in this embodiment, the heat conducting metal is copper.
Optionally, in this embodiment, the heat conducting metal is aluminum.
In a third aspect, an embodiment of the present application further provides a battery pack structure, where the battery pack structure includes a plurality of battery cells and the battery pack cooling system mentioned in the first aspect, the battery cells are arranged side by side to form a battery pack, and the battery pack cooling system is configured to perform thermal management on the battery pack.
Optionally, in this embodiment, the refrigerant pipeline is disposed below the battery cell of the battery pack and is in contact with the battery cell.
Compared with the prior art, the embodiment of the application has the following beneficial effects:
the application provides a battery pack cooling system and a battery pack structure, wherein the system comprises a refrigerant pipeline, an electronic expansion valve, a compressor and a condenser; the refrigerant pipeline comprises a plurality of pipe groups, the pipe groups are arranged on the surface of the battery pack, and the refrigerant pipeline comprises an input port, an output port and a pipeline positioned between the input port and the output port; the input port is connected with the electronic expansion valve through an interface; the output port is connected with the compressor through an interface; the compressor is connected with the electronic expansion valve through a condenser. The refrigerant pipeline, the electronic expansion valve, the compressor and the condenser form a circulation loop for circulating a refrigerant, and the refrigerant is in a gas-liquid mixing state when entering the refrigerant pipeline and being output from the refrigerant pipeline under the action of the electronic expansion valve, so that the temperature of the whole refrigerant pipeline is consistent, no temperature difference exists, the whole battery pack is at the same temperature, and the service life of the battery pack is prevented from being reduced due to overlarge temperature difference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is one of system block diagrams of a battery pack cooling system provided in an embodiment of the present application;
fig. 2 is a schematic structural view of the refrigerant pipeline;
fig. 3 is a second system block diagram of a battery pack cooling system according to an embodiment of the present application;
fig. 4 is a third system block diagram of a battery pack cooling system according to an embodiment of the present application.
Icon: 1-a battery pack cooling system; 10-refrigerant pipeline; 20-an electronic expansion valve; 30-a compressor; 40-a condenser; 50-back pressure valve; 60-a gas-liquid separator; 70-an electronic pump; 101-a tube set; 102-an input port; 103-an output port; 104-pipeline.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
The terms "upper", "lower", "left", "right", "inner", "outer", and the like, refer to an orientation or positional relationship based on that shown in the drawings, or that is conventionally placed during use of the product of this application, and are used only for convenience in describing and simplifying the application, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the application.
Furthermore, the terms "vertical" and the like do not require absolute perpendicularity between the components, but may be slightly inclined. Such as "vertical" merely means that the direction is relatively more vertical and does not mean that the structure must be perfectly vertical, but may be slightly inclined.
In the description of the present application, it is also noted that the terms "disposed," "mounted," "connected," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, the connection can be fixed, detachable or integrated; 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 in a specific case by those of ordinary skill in the art.
In power battery's system, mostly adopt the liquid cooling system to carry out the heat management to the battery package among the prior art, and in this application, adopt the refrigerant to cool off the battery package, cooling efficiency is higher than the liquid cooling system far away. If need charge to power battery fast, the heat also can corresponding quick production, adopts the refrigerant directly to cool off the battery package and can take away the heat of battery package fast, satisfies power battery's the demand of filling soon.
Referring to fig. 1, fig. 1 is a system block diagram of a battery pack cooling system according to an embodiment of the present disclosure, where the system 1 includes a refrigerant pipeline 10, an electronic expansion valve 20, a compressor 30, and a condenser 40.
Referring to fig. 2 and fig. 2 are schematic structural views of the refrigerant pipeline 10, the refrigerant pipeline 10 includes a plurality of pipe groups 101, the pipe groups 101 are disposed on the surface of the battery pack, and the refrigerant pipeline 10 includes an input port 102, an output port 103, and a pipeline 104 located between the input port and the output port. During the whole refrigerant cycle, after entering the refrigerant pipeline 10 from the input port 102, the refrigerant flows through the whole refrigerant pipeline 10 through the pipeline 104 between the input port 102 and the output port 103, is evaporated into a gaseous refrigerant by the refrigerant pipeline 10, and is delivered to the compressor 30.
With continued reference to fig. 1 and fig. 2, the input port 102 is connected to the electronic expansion valve 20 through an interface; the output port 103 is connected with the compressor 30 through an interface; the compressor 30 is connected to the electronic expansion valve 20 through a condenser 40.
The refrigerant in the refrigerant pipeline 10 is partially evaporated into a gaseous refrigerant after passing through the refrigerant pipeline 10, and the gaseous refrigerant is mixed with the liquid refrigerant which is not evaporated and then enters the compressor 30, and the compressor 30 heats and pressurizes the gaseous refrigerant therein to obtain the refrigerant in a gas-liquid mixed state.
The gas-liquid mixed refrigerant outputted from the compressor is liquefied into a liquid refrigerant after passing through the condenser 40, and the liquid refrigerant is partially gasified after passing through the electronic expansion valve 20, and the refrigerant is again changed into a gas-liquid mixed state.
The refrigerant pipeline 10 evaporates a part of liquid refrigerant of the refrigerant in a gas-liquid mixed state, so that the refrigerant is in a gas-liquid mixed state after being output from the output port 103 of the refrigerant pipeline 10, thereby completing the circulation of the refrigerant.
Because the refrigerant is in a gas-liquid mixed state when being input into the refrigerant pipeline 10 and output from the refrigerant pipeline 10, the temperature difference of the whole refrigerant pipeline 10 is not large, so that the temperature difference of the battery pack contacted with the refrigerant pipeline 10 is relatively small, and the service life of the battery pack can be prolonged. The content ratio of the gaseous refrigerant in the output refrigerant pipeline 10 is higher than that of the gaseous refrigerant when the gaseous refrigerant is input into the refrigerant pipeline 10.
Referring to fig. 3, fig. 3 is a second system block diagram of the battery pack cooling system according to the embodiment of the present disclosure, in this embodiment, the system 1 further includes a back pressure valve 50, wherein the output port is connected to the back pressure valve 50 through an interface, the back pressure valve 50 is connected to the compressor 30, and the back pressure valve 50 is configured to control a pressure value of the refrigerant pipeline 10, so that the refrigerant pipeline 10 is in a high-pressure state, so as to increase an evaporation temperature of the refrigerant and reduce generation of condensed water.
In the present embodiment, the evaporation temperature of the refrigerant depends on the pressure of the air in the refrigerant line 10, and the higher the pressure of the air, the higher the evaporation temperature of the refrigerant. The back pressure valve 50 is disposed between the refrigerant pipeline 10 and the compressor 30, the back pressure valve 50 controls the air pressure value in the refrigerant pipeline 10, and the evaporation temperature of the refrigerant can be increased by about 20 ℃ under the action of the back pressure valve 50, so that the generation of condensed water is reduced.
Referring to fig. 4, fig. 4 is a third system block diagram of a battery pack cooling system according to an embodiment of the present application, in this embodiment, the system 1 further includes: a gas-liquid separator 60.
An input port of the gas-liquid separator 60 is connected to the back pressure valve 50, and an output port of the gas-liquid separator is connected to the compressor 30 and an input port 102 of the refrigerant pipeline 10, respectively. The gas-liquid separator 60 is configured to separate gas and liquid of the refrigerant in a gas-liquid mixed state output from the back pressure valve 50, deliver the gaseous refrigerant to the compressor 30, perform a heating and pressurizing operation, and directly deliver the liquid refrigerant to the input port of the refrigerant pipeline 10.
In the present embodiment, in order to make the refrigerant input and output from the refrigerant pipeline 10 in a gas-liquid mixed state, more liquid refrigerant entering the refrigerant pipeline 10 needs to be made not to be completely evaporated, so that the gaseous refrigerant and the liquid refrigerant are separated, the liquid refrigerant is directly delivered to the input port 102 of the refrigerant pipeline 10, and the gaseous refrigerant is delivered to the compressor 30 for heating and pressurizing operations.
Referring to fig. 4, in the present embodiment, the system 1 further includes an electronic pump 70: the electronic pump 70 is disposed between the gas-liquid separator 60 and the refrigerant pipeline 10, and is configured to pump the liquid refrigerant after gas-liquid separation into an input port of the refrigerant pipeline 10.
The electronic pump 70 is connected to the gas-liquid separator 60, and delivers the liquid refrigerant acted by the gas-liquid separator 60 to the input port 102 of the refrigerant pipeline 10.
In the present embodiment, the electronic expansion valve 20 can control the degree of vaporization of the refrigerant flowing into the electronic expansion valve 20 to ensure that a sufficient amount of liquid refrigerant flows into the refrigerant pipeline 10. The refrigerant vaporized by the electronic expansion valve 20 and the refrigerant that is not vaporized are mixed and flow into the inlet 102 of the refrigerant line 10. Because more liquid refrigerants are mixed in the refrigerant in the gas-liquid mixed state flowing into the refrigerant pipeline 10, the refrigerant pipeline 10 cannot completely evaporate the liquid refrigerants, and therefore when the refrigerant pipeline 10 is output, the refrigerant still keeps the gas-liquid mixed state, the problem that the temperature difference is large due to the fact that the refrigerant pipeline 10 is too large is solved, the temperature of the whole refrigerant pipeline 10 is kept consistent, the temperature of the battery pack in contact with the refrigerant pipeline 10 is kept consistent, and the service life of the battery pack is greatly prolonged.
In this embodiment, the refrigerant pipeline 10 is made of a heat conductive metal. The battery pack cooling system utilizes the principle of latent heat of evaporation of the refrigerant, namely, the refrigerant absorbs heat in the process of converting liquid state into gas state, so that heat between the battery pack and the refrigerant pipeline 10 can be smoothly transferred if the battery pack is subjected to heat management, and the refrigerant pipeline 10 is made of heat-conducting metal which can transfer heat and has the capacity of resisting deformation and fracture of the metal.
In one embodiment of this embodiment, the thermally conductive metal is copper.
In another embodiment of this embodiment, the thermally conductive metal is aluminum.
It should be noted that the above-mentioned copper and aluminum are only two embodiments in this embodiment, and in other embodiments of this embodiment, the heat conductive metal may also be a metal having a heat conductive property, and the kind of the heat conductive metal is not limited herein.
The embodiment of the application further provides a battery package structure, battery package structure includes a plurality of electric cores and battery package cooling system 1, a plurality of electric cores set up side by side and constitute the battery package, battery package cooling system is used for carrying out the heat management to the battery package, prevents that the battery package from also promoting new energy automobile's performance simultaneously because the heat is too high to life's influence in the use.
In this embodiment, the refrigerant pipeline 10 is disposed below the battery cell of the battery pack and contacts with the battery cell. The battery core is in contact with the refrigerant pipeline 10 and can transfer heat, so that the refrigerant in the refrigerant pipeline 10 can absorb heat generated in the use process of the battery pack when being evaporated, the battery pack is subjected to heat management, and the service life of the battery pack is prolonged.
In summary, the present application provides a battery pack cooling system and a battery pack structure, the system includes a refrigerant pipeline, an electronic expansion valve, a compressor and a condenser; the refrigerant pipeline comprises a plurality of pipe groups, the pipe groups are arranged on the surface of the battery pack, and the refrigerant pipeline comprises an input port, an output port and a pipeline positioned between the input port and the output port; the input port is connected with the electronic expansion valve through an interface; the output port is connected with the compressor through an interface; the compressor is connected with the electronic expansion valve through a condenser. The refrigerant pipeline, the electronic expansion valve, the compressor and the condenser form a circulation loop for circulating a refrigerant, the refrigerant is in a gas-liquid mixing state when entering the refrigerant pipeline and being output from the refrigerant pipeline under the action of the electronic expansion valve, so that the temperature of the whole refrigerant pipeline is consistent, the temperature difference is small, the whole battery pack is at the same temperature, the service life of the battery pack is prevented from being shortened due to overlarge temperature difference, meanwhile, the evaporation temperature of the refrigerant is increased due to the back pressure valve, the generation of condensed water is reduced, and the service life of the battery pack can be prolonged.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A battery pack cooling system is characterized by comprising a refrigerant pipeline, an electronic expansion valve, a compressor and a condenser;
the refrigerant pipeline comprises a plurality of pipe groups, the pipe groups are arranged on the surface of the battery pack, and the refrigerant pipeline comprises an input port, an output port and a pipeline positioned between the input port and the output port;
the input port is connected with the electronic expansion valve through an interface;
the output port is connected with the compressor through an interface;
the compressor is connected with the electronic expansion valve through a condenser;
the refrigerant arranged in the refrigerant pipeline is partially evaporated into a gaseous refrigerant after passing through the refrigerant pipeline, the gaseous refrigerant is mixed with the liquid refrigerant which is not evaporated and then enters the compressor, and the compressor heats and pressurizes the gaseous refrigerant in the compressor;
the refrigerant in a gas-liquid mixed state output from the compressor is liquefied into a liquid refrigerant after passing through the condenser, and the liquid refrigerant is partially gasified after passing through the electronic expansion valve and is changed into a gas-liquid mixed state;
the refrigerant pipeline evaporates part of liquid refrigerant of the refrigerant in a gas-liquid mixed state, so that the refrigerant is in a gas-liquid mixed state after being output from an output port of the refrigerant pipeline, and the circulation of the refrigerant is completed;
the electronic expansion valve controls the partial vaporization of the refrigerant in the electronic expansion valve so that the refrigerant is not completely vaporized in a refrigerant pipeline.
2. The battery pack cooling system of claim 1, further comprising a back pressure valve, wherein the output port is connected to the back pressure valve via an interface, the back pressure valve is connected to the compressor, and the back pressure valve is configured to control a pressure value of the refrigerant pipeline to keep the refrigerant pipeline in a high pressure state, so as to increase an evaporation temperature of the refrigerant and reduce generation of condensed water.
3. The battery pack cooling system of claim 2, further comprising a gas-liquid separator:
the input port of the gas-liquid separator is connected with the back pressure valve, the output port of the gas-liquid separator is respectively connected with the compressor and the input port of the refrigerant pipeline, wherein the gas-liquid separator is used for performing gas-liquid separation on the refrigerant in a gas-liquid mixed state, the gaseous refrigerant is conveyed to the compressor for heating and pressurizing operation, and the liquid refrigerant is directly conveyed to the input port of the refrigerant pipeline.
4. The battery pack cooling system of claim 3, further comprising an electronic pump: the electronic pump is arranged between the gas-liquid separator and the refrigerant pipeline and is used for pumping the liquid refrigerant after gas-liquid separation into an inlet of the refrigerant pipeline.
5. The battery pack cooling system of claim 4, wherein the coolant line is made of a thermally conductive metal.
6. The battery pack cooling system of claim 5, wherein the thermally conductive metal is copper.
7. The battery pack cooling system of claim 5, wherein the thermally conductive metal is aluminum.
8. A battery pack structure, comprising a plurality of battery cells and the battery pack cooling system of any one of claims 1 to 7, wherein the plurality of battery cells are arranged side by side to form a battery pack, and the battery pack cooling system is configured to thermally manage the battery pack.
9. The battery pack structure of claim 8, wherein the coolant line is disposed under the battery cells of the battery pack and contacts the battery cells.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811384943.3A CN109489283B (en) | 2018-11-20 | 2018-11-20 | Battery pack cooling system and battery pack structure |
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| CN201811384943.3A CN109489283B (en) | 2018-11-20 | 2018-11-20 | Battery pack cooling system and battery pack structure |
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| CN109489283B true CN109489283B (en) | 2021-07-06 |
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| CN110030755A (en) * | 2019-05-23 | 2019-07-19 | 苏州奥德机械有限公司 | A kind of battery pack carbon dioxide refrigerating system |
| CN113108507A (en) * | 2021-03-26 | 2021-07-13 | 苏州必信空调有限公司 | Battery cooling and unit integrated refrigerating system |
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