CN114543393A - Heat exchange assembly - Google Patents
Heat exchange assembly Download PDFInfo
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- CN114543393A CN114543393A CN202011352100.2A CN202011352100A CN114543393A CN 114543393 A CN114543393 A CN 114543393A CN 202011352100 A CN202011352100 A CN 202011352100A CN 114543393 A CN114543393 A CN 114543393A
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- 239000012530 fluid Substances 0.000 claims abstract description 97
- 238000004891 communication Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 abstract description 18
- 239000012071 phase Substances 0.000 description 20
- 238000009434 installation Methods 0.000 description 8
- 230000005514 two-phase flow Effects 0.000 description 8
- 239000013529 heat transfer fluid Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- F25B39/00—Evaporators; Condensers
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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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- 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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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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
- 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
Abstract
A heat exchange assembly comprises a first battery assembly and a first heat exchange unit, wherein the first heat exchange unit comprises a fluid inlet, a fluid outlet, a first expansion valve, at least one first heat exchange device and two second heat exchange devices, the first expansion valve is provided with a first expansion valve inlet and a first expansion valve outlet, the first expansion valve inlet is communicated with the fluid inlet, one side surface of the first heat exchange device exchanges heat with a battery unit, the second heat exchange device is positioned between adjacent battery units, the first heat exchange device is provided with a first channel inlet and a first channel outlet, at least one first channel inlet is communicated with the first expansion valve outlet, the first channel inlet of the first heat exchange device with small heat exchange requirement is communicated with the first expansion valve outlet, and a gas-liquid two-phase fluid with certain dryness coming out of the first expansion valve flows into the first heat exchange device for heat exchange, the adjustment of the heat exchange power of the heat exchange device is realized by changing the circulation paths of the heat exchange fluid in different heat exchange devices.
Description
Technical Field
The application relates to the technical field of heat exchange, in particular to a heat exchange assembly.
Background
In the field of heat exchange technology, a heat exchange device is generally provided with a heat exchange fluid channel, and when flowing through the heat exchange fluid channel, the heat exchange fluid exchanges heat with other fluids in adjacent heat exchange fluid channels, or exchanges heat with a part to be heat exchanged outside the heat exchange fluid channel, or exchanges heat with air outside the heat exchange fluid channel.
Along with the heat transfer demand is higher and higher, heat transfer system's application environment is also more and more complicated, and when setting up a plurality of heat transfer device, the distribution of the heat transfer fluid between each heat transfer device is comparatively complicated, and the system pressure drop is difficult to control when the heat transfer fluid flows through each heat transfer device moreover, not only influences whole heat transfer system's heat exchange efficiency, and each heat transfer device's heat transfer volume is difficult to control.
Disclosure of Invention
An object of this application is to provide a heat exchange assembly, when satisfying each heat transfer device's heat transfer demand, promotes whole heat exchange assembly's heat transfer homogeneity.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a heat exchange assembly comprises a first battery assembly and a first heat exchange unit which exchanges heat with the first battery assembly, wherein the first battery assembly comprises a plurality of battery units, the first heat exchange unit comprises a fluid inlet, a fluid outlet, a first expansion valve and a plurality of heat exchange devices, the first expansion valve is provided with a first expansion valve inlet and a first expansion valve outlet, the first expansion valve inlet is communicated with the fluid inlet, and the heat exchange assembly is characterized in that the heat exchange devices at least comprise a first heat exchange device and two second heat exchange devices, one side surface of the first heat exchange device exchanges heat with the battery units, the second heat exchange devices are located between the adjacent battery units, the first heat exchange device is provided with a first channel inlet and a first channel outlet, and at least one first channel inlet is communicated with the first expansion valve outlet.
According to the battery unit heat exchange system, the first channel inlet of the first heat exchange device with only one side face exchanging heat with the battery unit is communicated with the outlet of the first expansion valve, namely the heat exchange quantity between the first heat exchange device and the battery unit is low, a gas-liquid two-phase fluid from the first expansion valve flows into the first heat exchange device for heat exchange, most (mass) of the two-phase fluid participating in the fluid is in a liquid state, the flowing pressure drop is low in the process of heat exchange of the two-phase fluid under low dryness, the first heat exchange device with low heat exchange quantity is used as an upstream, and the heat exchange task of the first heat exchange device in the system is completed under the condition of no large flow channel pressure drop, so that the low heat exchange requirement of the first heat exchange device is met, the surface temperature uniformity of the battery unit is guaranteed, and the system pipeline is saved. On the other hand, after the heat exchange fluid is subjected to heat exchange through the first heat exchange device, the gas-liquid two-phase flow state is developed to a more stable homogeneous phase flow state, and fluid distribution at the downstream of the first heat exchange device is ensured. In summary, the technical requirements of refrigerant distribution difficulty and battery unit surface temperature uniformity in the system are well balanced, and the problem of gas-liquid two-phase flow distribution is a challenging technical problem especially in the technical scene of parallel connection of a plurality of heat exchange devices or pipelines.
Drawings
FIG. 1 is a schematic view of a heat exchange assembly of the present application in use for cooling a battery;
FIG. 2 is a schematic view of another embodiment of a heat exchange assembly of the present application for battery cooling;
FIG. 3 is a schematic view of another embodiment of a heat exchange assembly of the present application for battery cooling;
FIG. 4 is a schematic view of a first connection of a first heat exchange unit of the heat exchange assembly of the present application;
FIG. 5 is a schematic view of a second connection of a first heat exchange unit of the heat exchange assembly of the present application;
FIG. 6 is a third schematic view of the connection of a first heat exchange unit in the heat exchange assembly of the present application;
FIG. 7 is a schematic view of a fourth connection of a first heat exchange unit of the heat exchange assembly of the present application;
FIG. 8 is a schematic view of a connection between a first heat exchange unit and a second heat exchange unit of the heat exchange assembly of the present application;
FIG. 9 is a schematic view of another connection of a first heat exchange unit and a second heat exchange unit of the heat exchange assembly of the present application;
fig. 10 is a schematic view of another connection of a first heat exchange unit and a second heat exchange unit in the heat exchange assembly of the present application.
Detailed Description
Referring to fig. 1-2, a heat exchange assembly is provided for the present application, which is applied in a battery cooling system, especially a battery cooling system of an automobile, and specifically includes a first battery assembly and a first heat exchange unit, the first battery assembly includes a plurality of battery units, the first heat exchange unit exchanges heat with the battery units to reduce the temperature of the battery units, wherein the first heat exchange unit includes a fluid inlet 1, a fluid outlet 2, a first expansion valve 3 and a plurality of heat exchange devices, the first expansion valve 3 has a first expansion valve inlet and a first expansion valve outlet, the first expansion valve inlet is communicated with the fluid inlet 1, or the first expansion valve inlet forms the fluid inlet 1 of the heat exchange assembly, the heat exchange fluid flows into the first expansion valve 3 through the fluid inlet 1, the heat exchange devices at least include a first heat exchange device 5 and two second heat exchange devices 6, one side surface of the first heat exchange device exchanges heat with the battery units, the second heat exchange device is positioned between the adjacent battery units, two side surfaces of the second heat exchange device exchange heat with the battery units, the first heat exchange device 5 is provided with a first channel inlet and a first channel outlet, at least one first channel inlet is communicated with the first expansion valve outlet, and at least part of the low-dryness heat exchange fluid flowing through the first expansion valve 3 flows into the first heat exchange device 5 for heat exchange.
This application will only one side communicate with battery unit heat transfer's first heat transfer device 5's first passageway import and first expansion valve export, will flow into first heat transfer device 5 from the gas-liquid two-phase attitude heat transfer fluid that first expansion valve 3 came out and carry out the heat transfer, the heat transfer fluid is most (quality) liquid this moment, the pressure drop of the heat transfer passageway that flows through in first heat transfer device 5 is less, under the low heat transfer demand of realizing first heat transfer device 5, the heat transfer fluid pressure drop behind first heat transfer device 5 is less, the technical requirement of battery unit surface temperature uniformity has been guaranteed, and for other high power heat transfer device's of low reaches fluid distribution and heat transfer, better technical basis is provided.
Because battery pack's installation environment space is limited, and battery unit's arrangement receives the restriction, and heat transfer device's mounted position is limited, especially when partial heat transfer device's heat transfer demand is different with other heat transfer device's heat transfer demand, through the intercommunication relation of each heat transfer device of adjustment heat transfer assembly, promotes whole heat transfer assembly's heat exchange efficiency and realizes heat transfer device's different heat transfer demands.
As shown in fig. 1, the heat exchange assembly provided in this embodiment includes a first battery assembly and a first heat exchange unit exchanging heat with the first battery assembly, the first battery assembly includes four battery units 8, the first heat exchange unit includes a first heat exchange device 5 and two second heat exchange devices 6, wherein three battery units 8 are vertically arranged and are sequentially arranged in a transverse direction, the second heat exchange device 6 is arranged between adjacent battery units 8, two side surfaces of the second heat exchange device 6 exchange heat with the adjacent battery units 8 respectively, so as to cool the battery units 8, one of the battery units 8 is horizontally arranged and is arranged above the three vertically arranged battery units 8, so as to achieve compactness of the structure of the plurality of battery units 8 and save installation space, the first heat exchange device 5 is arranged on one side of the horizontally arranged battery unit 8, because one side surface of the first heat exchange device 5 exchanges heat with the battery unit 8, two sides of the second heat exchange device 6 exchange heat with the battery units 8, so that the heat exchange requirement of the first heat exchange device 5 is half of that of the second heat exchange device 6, and each battery unit 8 basically keeps similar heat exchange amount.
As shown in fig. 2, the heat exchange assembly provided in this embodiment includes a first battery assembly and a first heat exchange unit exchanging heat with the first battery assembly, the first battery assembly includes four battery units 8, the first heat exchange unit includes a first heat exchange device 5 and two second heat exchange devices 6, wherein the four battery units 8 are horizontally disposed, one battery unit 8 is vertically disposed, the horizontally disposed battery units 8 are stacked two by two and then horizontally arranged, the vertically disposed battery unit 8 is disposed at one side, wherein one horizontally disposed second heat exchange device 6 is respectively disposed between the upper and lower horizontally disposed battery units 8, the vertically disposed first heat exchange device 5 is disposed at the outer side of the vertically disposed battery unit 8, so that one side of the first heat exchange device 5 exchanges heat with the vertically disposed battery unit 8, and two sides of the horizontally disposed second heat exchange unit 6 exchange heat with the adjacent horizontally disposed battery units 8, therefore, the heat exchange requirement of the first heat exchange device 5 is half of the heat exchange requirement of the second heat exchange device 6, so that each battery unit 8 basically keeps similar heat exchange amount, the heat exchange assembly in the embodiment can adopt the connection mode as shown in fig. 1-5, thereby realizing different heat exchange requirements of the heat exchange devices through the connection mode of the heat exchange devices, specifically enabling the heat exchange power of the first heat exchange device 5 to be approximately half of the heat exchange power of the second heat exchange device 6, and ensuring the temperature uniformity requirement on the surface of each battery unit 8 through the adjustment of the connection mode of each heat exchange device, thereby prolonging the service life of the battery units 8.
It is understood that the number of the battery cells 8 may be adjusted, and the placement position of each battery cell 8 may be adjusted according to the installation space, not limited to the above-described specific embodiment.
In addition, in the embodiment shown in fig. 1 and 2, the connection mode of the first heat exchange unit can adopt any one of fig. 4 to 7, so that different heat exchange requirements of the heat exchange device are realized through the connection mode of the heat exchange device, specifically, the heat exchange power of the first heat exchange device 5 is approximately half of the heat exchange power of the second heat exchange device 6, the temperature uniformity requirement of the surface of each battery unit 8 is ensured through the adjustment of the connection mode of each heat exchange device, and the service life of the battery unit 8 is prolonged.
As shown in fig. 4, in some embodiments, the first heat exchange unit includes a first expansion valve 3, a first heat exchange device 5 and two second heat exchange devices 6, wherein one side of the first heat exchange device exchanges heat with the heat exchange unit, two sides of the second heat exchange device exchange heat with the heat exchange unit, the fluid inlet 1 is communicated with the inlet of the first expansion valve, the outlet of the first expansion valve is communicated with the inlet of the first channel of the first heat exchange device 5, the two second heat exchange devices 6 are arranged in parallel, and the inlets of the second channels of the two second heat exchange devices 6 are communicated with the outlet of the first channel of the first heat exchange device 5.
It should be noted that the serial arrangement in the present application means that the heat exchange fluid flows through more than two heat exchange devices in sequence, may flow through in sequence, or may flow through other components between the two, and the parallel arrangement means that the heat exchange fluid is divided into different branches and flows through corresponding heat exchange devices, and each branch may be provided with other components in addition to the corresponding heat exchange device.
In the embodiment, the inlet of the first channel of the first heat exchange device 5 with small heat exchange requirement is communicated with the outlet of the first expansion valve, the gas-liquid two-phase fluid from the first expansion valve 3 flows into the first heat exchange device 5 for heat exchange, most (mass) of the two-phase fluid participating in the fluid is liquid, and the flow pressure drop is low in the heat exchange process of the two-phase fluid under low dryness, meanwhile, because the heat exchange requirement of the first heat exchange device 5 is small, namely the heat exchange quantity between the first heat exchange device 5 and the battery unit is small, after the two-phase fluid flows through the first heat exchange device 5, although the dryness of the heat exchange fluid is increased, the total dryness of the fluid is not large, the average flow state is high in liquid phase specific gravity, the pressure drop of the heat exchange fluid after the heat exchange fluid flows through the first heat exchange device 5 is small, a large temperature difference is not formed on the first heat exchange device, and the fluid temperature and the wall temperature in the whole first heat exchange device 5 are uniform, the temperature equalizing effect of the battery unit exchanging heat with the battery unit can be effectively ensured.
In addition, the dryness of the heat exchange fluid after heat exchange by the first heat exchange device 5 is increased, that is, the gas-liquid two-phase heat exchange fluid at the outlet of the first channel of the first heat exchange device 5 is increased in gas-phase specific gravity relative to the heat exchange fluid at the inlet of the first channel of the first heat exchange device 5, the mixing effect between the fluids is enhanced, the flow state is closer to a homogeneous and homogeneous flow state, and the distribution uniformity of the heat exchange fluid at the downstream of the first heat exchange device 5 in the two second heat exchange devices 6 is ensured.
On one hand, the first heat exchange device 5 with low heat exchange capacity is used as the upstream, and the low heat exchange task of the first heat exchange device 5 in the system is completed under the condition of no large flow passage pressure drop, so that the surface temperature uniformity of the battery unit is ensured, and the system pipeline is saved; on the other hand, after the first heat exchange device 5 exchanges heat with the battery unit, after certain heat is supplied, a gas-liquid two-phase flow state is developed to a more stable homogeneous phase flow state, which is an important technical basis for ensuring the fluid distribution problem at the downstream of the first heat exchange device 5, at the moment, the two second heat exchange devices 6 are arranged in parallel, the distribution uniformity of the heat exchange fluid between the two second heat exchange devices 6 is improved, the high heat exchange power requirements of the two second heat exchange devices 6 and the distribution uniformity of the heat exchange fluid in each second heat exchange device 6 are realized, in addition, the parallel arrangement reduces the pressure drop of the heat exchange assembly, the heat exchange efficiency is improved, the refrigerant distribution difficulty in the system and the temperature uniformity technical requirements on the surfaces of the battery units are well balanced, and the requirements of different heat exchange powers of the plurality of heat exchange devices are realized.
As shown in fig. 5, in some embodiments, the first heat exchange unit includes one first expansion valve 3, two first heat exchange means 5 and two second heat exchange means 6, wherein, one side of the first heat exchange device exchanges heat with the heat exchange unit, two sides of the second heat exchange device exchange heat with the heat exchange unit, the heat exchange requirement of the first heat exchange device 5 is less than that of the second heat exchange device 6, the fluid inlet 1 is communicated with the inlet of the first expansion valve, the outlet of the first expansion valve is communicated with the inlet of the first channel of one of the first heat exchange devices 5, the two second heat exchange devices 6 are arranged in parallel, the outlet of the first channel of the first heat exchange device 5 is communicated with the inlets of the second channels of the two second heat exchange devices 6, and the second channel outlets of the two second heat exchange devices 6 are communicated with the first channel inlet of the other first heat exchange device 5, and the first channel outlet of the other first heat exchange device 5 is communicated with the fluid outlet 2. The difference between this embodiment and fig. 4 is that another first heat exchanger 5 is further disposed downstream of two second heat exchangers 6 disposed in parallel, so that the heat exchange fluid with a reduced heat exchange coefficient after flowing through the second heat exchangers 6 is further subjected to heat exchange with another first heat exchanger 5 with low power requirement, thereby increasing the heat exchange amount of the whole heat exchange assembly and further reducing the temperature of the battery assembly.
As shown in fig. 6, the first heat exchange unit comprises a first expansion valve 3, a first heat exchange device 5 and two second heat exchange devices 6, wherein one side surface of the first heat exchange device exchanges heat with the heat exchange unit, two side surfaces of the second heat exchange device exchange heat with the heat exchange unit, the heat exchange requirement of the first heat exchange device 5 is smaller than that of the second heat exchange device 6, a fluid inlet 1 is communicated with an inlet of the first expansion valve, the two second heat exchange devices 6 are arranged in parallel, a second channel inlet of each second heat exchange device 6 and a first channel inlet of the first heat exchange device 5 are communicated with an outlet of the first expansion valve, at least part of the low-dryness heat exchange fluid flowing through the first expansion valve is led to the first heat exchange device 5, so as to realize the low heat exchange requirement of the first heat exchange device 5 and ensure that the surface of the battery unit with the first heat exchange stability of the first heat exchange device 5 is uniform, and the flow of the heat exchange fluid in different heat exchange devices is controlled by arranging a restrictor or controlling the pipe diameters of pipelines leading to the first heat exchange device 5 and the second heat exchange device 6, so that the distribution uniformity of the heat exchange fluid of each second heat exchange device 6 is ensured while the high heat exchange power requirement of the second heat exchange device 6 is realized, and the uniformity of the surface temperature of the battery unit exchanging heat with the second heat exchange device is improved.
As shown in fig. 7, the first heat exchange unit comprises a first expansion valve 3, a first heat exchange device 5 and two second heat exchange devices 6, wherein one side surface of the first heat exchange device exchanges heat with the heat exchange unit, both side surfaces of the second heat exchange device exchange heat with the heat exchange unit, the heat exchange requirement of the first heat exchange device 5 is smaller than that of the second heat exchange device 6, the fluid inlet 1 is communicated with the first expansion valve inlet, the first expansion valve outlet is communicated with the first channel inlet of the first heat exchange device 5, the two second heat exchange devices 6 are arranged in series, the second channel inlet of one second heat exchange device 6 is communicated with the first channel outlet of the first heat exchange device 5, the second channel outlet is communicated with the second channel inlet of the other second heat exchange device 6, and the low-quality gas-liquid two-phase fluid flowing through the first expansion valve 3 flows into the first heat exchange device 5 for heat exchange, the heat exchange flow pressure drop is lower, meanwhile, the requirement on the heat exchange power of the first heat exchange device 5 is low, the dryness of the heat exchange fluid after heat exchange through the first heat exchange device 5 is slightly increased, the gas phase specific gravity of the heat exchange fluid is increased, the mixing effect between the fluids is enhanced, the flow state is more close to the flow state of a homogeneous phase, the distribution uniformity of the heat exchange fluid in the second heat exchange devices 6 at the downstream of the first heat exchange device 5 is improved, the temperature uniformity of the battery units exchanging heat with the second heat exchange devices 6 is improved, the two second heat exchange devices 6 are connected in series, the heat exchange fluid is ensured to flow through the two second heat exchange devices 6 in sequence, the heat exchange fluid does not need to be distributed in the two second heat exchange devices 6, the distribution difficulty of the heat exchange fluid is reduced, and the requirements on different heat exchange powers of the plurality of heat exchange devices are met.
In some specific embodiments, the heat exchange assembly may further include more than two battery assemblies and more than two heat exchange units for exchanging heat with the battery assemblies, as shown in fig. 3, the heat exchange assembly includes a first battery assembly, a first heat exchange unit for exchanging heat with the first battery assembly, a second battery assembly, and a second heat exchange unit for exchanging heat with the second battery assembly, where the first battery assembly includes four battery units 8, the battery units 8 in the first battery assembly may adopt any arrangement manner as shown in fig. 1, fig. 2, or other arrangements, fig. 3 is one specific arrangement manner of the first battery assembly, and the first heat exchange unit includes one first heat exchange device 5 and two second heat exchange devices 6, where the heat exchange device in the first heat exchange unit may specifically adopt any connection manner shown in fig. 4 to fig. 7, and details are not described here. The second battery pack comprises three battery units 8, the three battery units 8 are vertically arranged and are arranged along the horizontal direction, a third heat exchange device 7 is arranged between every two adjacent battery units 8 for heat exchange, one side surface of the first heat exchange device 5 exchanges heat with the battery units 8, and two side surfaces of the second heat exchange device 6 and the third heat exchange device 7 exchange heat with the battery units 8, so that, in order to keep the heat exchange amount of each battery unit 8 basically similar, the heat exchange requirement of the first heat exchange device 5 is half of that of the second heat exchange device 6, the heat exchange requirement of the second heat exchange device 6 is similar to that of the third heat exchange device 7, two third heat exchange devices 7 are arranged in the second heat exchange unit, the third heat exchange devices 7 can be arranged in series or in parallel, so that the heat exchange power of a large number of heat exchange devices can be controlled conveniently. Specifically, the number of the heat exchange devices is 7 in this embodiment, and in other embodiments, other numbers of heat exchange devices may be provided, for example, 6 or 8 or even more, and of course, when the number of the battery units is too large, more than 2 heat exchange units, for example, 3 or 4 heat exchange units may also be provided.
As shown in fig. 9 and 10, the heat exchange assembly includes a first heat exchange unit for exchanging heat with the first battery assembly and a second heat exchange unit for exchanging heat with the second battery assembly, the first heat exchange unit includes a first expansion valve 3, a first heat exchange device 5 and two second heat exchange devices 6, one side of the first heat exchange device 5 exchanges heat with the battery unit 8, two sides of the second heat exchange device 6 exchanges heat with the battery unit 8, the heat exchange requirement of the first heat exchange device 5 is smaller than that of the second heat exchange device 6, the fluid inlet 1 is communicated with the inlet of the first expansion valve, the outlet of the first expansion valve is communicated with the inlet of the first channel of the first heat exchange device 5, the two second heat exchange devices 6 are arranged in parallel, the inlets of the second channels of the two second heat exchange devices 6 are both communicated with the outlet of the first channel of the first heat exchange device 5, the second heat exchange unit includes a second expansion valve 4 and two third heat exchange devices 7, as shown in fig. 9, the two third heat exchangers 7 are arranged in series, the inlet of the second expansion valve 4 is communicated with the fluid inlet 1, the inlet of the third channel of one third heat exchanger 7 is communicated with the outlet of the second expansion valve, and the outlet of the third channel is communicated with the inlet of the third channel of the other third heat exchanger 7, as shown in fig. 10, the two third heat exchangers 7 are arranged in parallel, and the inlet of the third channel of each third heat exchanger 7 is communicated with the outlet of the second expansion valve.
The embodiment shown in fig. 9 and 10 is different from the embodiment shown in fig. 4 in that the heat exchange assembly has a second heat exchange unit, when the heat exchange assembly has a plurality of heat exchange devices with different power requirements and the number of the heat exchange devices with high power requirements is too large, in order to reduce the difference of the heat exchange power of each high-power heat exchange device and ensure the heat exchange power requirement of the high-power heat exchange device, the heat exchange assembly is set into two heat exchange units, and part of the high-power heat exchange device is set in the second heat exchange unit to ensure the consistency of the heat exchange power of each high-power heat exchange device, specifically, two side surfaces of the second heat exchange device 6 and the third heat exchange device 7 exchange heat with the battery unit, namely, both heat exchange devices are high-power heat exchange devices, one side surface of the first heat exchange device 5 exchanges heat with the heat exchange unit, namely, a low-power heat exchange device, in the first heat exchange unit, the heat exchange fluid passing through the first heat exchange device 5 is divided into two paths to flow into the two second heat exchange devices 6, at the moment, the gas phase proportion of the heat exchange fluid in a gas-liquid two-phase flow state is increased, a more stable homogeneous flow state is developed, the mixing effect between the fluids is enhanced, the flow state is more close to the homogeneous flow state, the heat exchange fluid in the gas-liquid two-phase flow state is conveniently and uniformly distributed in the two second heat exchange devices 6, the two third heat exchange devices 7 in the second heat exchange unit are arranged in series, the distribution performance of the heat exchange fluid between the two third heat exchange devices 7 is good, and different states of the heat exchange fluid between different branches and different communication relations between the second heat exchange devices 6 and the third heat exchange devices 7 are controlled, so that the high power requirements of the second heat exchange devices 6 and the third heat exchange devices 7 are realized, and the difference of the heat exchange power of the second heat exchange devices 6 and the third heat exchange devices 7 is reduced, therefore, the low heat exchange requirement of the first heat exchange device 5 and the high power requirement of the second heat exchange device 6 and the third heat exchange device 7 are realized, the uniformity of the surface temperature of the battery unit exchanging heat with the first heat exchange device 5 is ensured by controlling the pressure drop of the heat exchange fluid in the first heat exchange device 5, and the more stable homogeneous phase flow state is achieved by controlling the gas-liquid two-phase flow state of the heat exchange fluid in the second heat exchange device 6 and the third heat exchange device 7, so that the distribution uniformity of the heat exchange fluid in the second heat exchange device 6 and the third heat exchange device 7 and the distribution uniformity of the gas-liquid two-phase flow are improved, and the uniformity of the surface temperature of the battery unit exchanging heat with the second heat exchange device 6 and the third heat exchange device 7 is ensured.
As shown in fig. 8, in some embodiments, the heat exchange assembly includes a first heat exchange unit and a second heat exchange unit, the first heat exchange unit is provided with a first expansion valve 3 and a first heat exchange device 5, one side of the first heat exchange device 5 exchanges heat with the battery unit 8, the fluid inlet 1 is communicated with the inlet of the first expansion valve, the first channel inlet of the first heat exchange device 5 is communicated with the outlet of the first expansion valve, the first channel outlet of the first heat exchange device is communicated with the fluid outlet, the second heat exchange unit is provided with a second expansion valve 4 and four second heat exchange devices 6, both sides of the second heat exchange devices 6 exchange heat with the battery unit, each second heat exchange device 6 is arranged in parallel, the second channel inlet of each second heat exchange device 6 is communicated with the outlet of the second expansion valve, the first heat exchange device 5 with low heat exchange demand is separately arranged in the first heat exchange unit, the plurality of second heat exchange devices 6 with high heat exchange demand are arranged in the second heat exchange unit, thereby realize heat transfer device's different heat transfer power demand through different heat transfer unit to set up a plurality of second heat transfer device 6 parallelly connected, reduce whole heat exchange assembly's pressure drop, promote heat transfer performance, thereby through the different circulation route of control heat transfer fluid with the adjustment of realization heat transfer power and the heat exchange efficiency who promotes heat exchange assembly.
In some embodiments, a distribution joint 9 may be disposed between the second expansion valve 4 and the plurality of second heat exchangers 6, the distribution joint 9 has a joint inlet and two or more joint outlets, the second expansion valve outlet is communicated with the joint inlet, the number of the second heat exchangers 6 is two or more, specifically, as shown in fig. 8, the number of the second heat exchangers is 4, the second channel inlet of each second heat exchanger 6 is respectively communicated with the corresponding joint outlet, and when the number of the second heat exchangers 6 is too large, the distribution uniformity of the heat exchange fluid of each second heat exchanger 6 is ensured by disposing the distribution joint 9, so that the uniformity of the heat exchange power of each second heat exchanger 6 is ensured, and the difference of the heat exchange power of each second heat exchanger 6 is reduced.
It can be understood that the number of the second heat exchanging devices 6 may be other numbers, for example, 3, 5, etc., and the consistency of the heat exchanging power of each second heat exchanging device 6 is realized through the distribution joint 9, of course, the distribution joint 9 may not be provided, and the distribution uniformity of the heat exchanging fluid of each second heat exchanging device 6 is improved by controlling the number of the second heat exchanging devices 6.
In some embodiments, such as the embodiment shown in fig. 3, when the heat exchange devices having the same structure are used as the second heat exchange device 6 and the third heat exchange device 7, the connection relationship shown in fig. 8 can also be used, namely, the first heat exchange device 5 in the first heat exchange unit is arranged at one side of the uppermost battery unit 8 of the first battery assembly, one side of the first heat exchange device 5 exchanges heat with the heat exchange unit 8, 2 second heat exchange devices 6 in the second heat exchange units are arranged between two adjacent battery units 8 of the first battery assembly, two side surfaces of each second heat exchange device 6 exchange heat with the battery units, the other 2 second heat exchange devices in the second heat exchange units are arranged between the adjacent battery units of the second battery assembly, so that two sides of each second heat exchange device exchange heat with the battery units, therefore, the heat exchange units and the battery assemblies do not need to be in one-to-one correspondence, and the communication relation of the heat exchange units is more flexible.
In some specific embodiments, as shown in fig. 4 to 8, the first heat exchanging device 5 and the second heat exchanging device 6 may be heat exchanging devices having the same structure, so as to simplify the structure of the whole heat exchanging assembly, and when the heat exchanging assembly is installed, it is avoided that the heat exchanging devices having different structures cannot be identified to cause installation errors, and installation reliability and installation efficiency are improved.
In the embodiments shown in fig. 4 to 8, the first heat exchange device 5 and the second heat exchange device 6 are configured as heat exchange devices with the same structure, so that the heat exchange amount of the first heat exchange device 5 is controlled to be approximately half of the heat exchange amount of the second heat exchange device 6 by the connection manner of the above embodiments, and the heat exchange device is suitable for application scenarios with halved heat exchange requirements without adopting heat exchange devices with different structures. Of course, when the heat exchange amount of the first heat exchange device 5 and the heat exchange amount of the second heat exchange device 6 are not half of the heat exchange requirement, the relationship between the first heat exchange amount and the second heat exchange amount can be correspondingly adjusted by adjusting the structure of the first heat exchange device 5 or the second heat exchange device 6 or by setting a restrictor or controlling the pipe diameters of pipelines leading to the first heat exchange device 5 and the second heat exchange device 6, and the like, in combination with the connection mode in the embodiment, on the basis that the first heat exchange requirement is smaller than the second heat exchange requirement, so that the whole heat exchange assembly is simplified.
In the embodiment shown in fig. 9 and 10, the first heat exchanging device 5, the second heat exchanging device 6, and the third heat exchanging device 7 may be all configured as heat exchanging devices with the same structure, so as to simplify the structure of the whole heat exchanging assembly, and improve the installation reliability and the installation efficiency. In addition, all the heat exchange devices are set to be in the same structure, and through the connection mode and the adjustment of the flow of the heat exchange fluid in the two heat exchange units, for example, the ratio of the flow rate of the heat exchange fluid of the first heat exchange unit to the flow rate of the heat exchange fluid of the second heat exchange unit is 1.1-1.3, the heat exchange amount of the first heat exchange device 5 is controlled to be close to half of the heat exchange amount of the second heat exchange device 6, the heat exchange amount of the third heat exchange device 7 is approximate to the heat exchange amount of the second heat exchange device 6, thereby realizing a plurality of high-power and one low-power heat exchange demands, especially when the number of the heat exchange devices in the first heat exchange unit and the second heat exchange unit is different and one branch circuit has the low-power and high-power heat exchange demands, the ingenious setting of above connected mode realizes that the heat transfer volume of second heat transfer device 6 is approximate to the heat transfer volume of third heat transfer device 7, guarantees the temperature uniformity requirement on the surface of the battery unit with each heat transfer device heat transfer moreover.
In some embodiments, when the heat exchange assembly has a plurality of heat exchange units, wherein one heat exchange unit has a plurality of heat exchange devices with different heat exchange requirements, the first heat exchange unit has a first heat exchange device 5 with a low heat exchange requirement and a plurality of second heat exchange devices 6 with a high heat exchange requirement, and the second heat exchange unit has a plurality of third heat exchange devices 7 with a high heat exchange requirement, for example, as shown in fig. 9 and 10, the number a of the first heat exchange devices 5 is 1, the number b of the second heat exchange devices 6 is 2, and the number c of the third heat exchange devices 7 is 2, wherein a + b > c, since the heat exchange fluid flowing through the first expansion valve 3 in the first heat exchange unit in the mainly liquid state at least partially flows into the first heat exchange device 5 for heat exchange, the pressure drop of the first heat exchange device 5 is controlled, the requirement of the low heat exchange power of the first heat exchange device 5 is realized, and the specific gravity of the heat exchange fluid after passing through the first heat exchange device 5 is increased, develops a more stable homogeneous phase flow state, enhances the mixing effect among the fluids, is more close to the flow state of homogeneous phase from the flow state, is convenient for the distribution of the heat exchange fluid in a gas-liquid two-phase flow state, improves the distribution uniformity and the heat exchange power of the second heat exchange device 6, in the second heat exchange unit, the low-dryness heat exchange fluid is at least distributed in part of the third heat exchange device 7, the local area in the third heat exchange device 7 is in a homogeneous phase flow state, and by controlling a + b to be more than c, thereby being beneficial to realizing that the heat exchange quantity of the second heat exchange device 6 is similar to that of the third heat exchange device 7, the heat exchange requirement of the first heat exchange device 5 is less than that of the second heat exchange device 6, especially when the first heat exchange device 5 and the second heat exchange device 6 are the same in structure, the heat exchange amount of the first heat exchange device 5 is about half of that of the second heat exchange device 6.
In some embodiments, set up the heat-conducting piece between heat transfer device and the battery unit 8, the heat-conducting piece specifically can be for heat-conducting glue or heat conduction pad etc. have heat conductivity and insulating connecting piece, a heat-transfer face of first heat transfer device 5 sets up heat-conducting piece and the heat transfer of adjacent battery unit 8, two heat-transfer faces of second heat transfer device 6 and third heat transfer device 7 set up heat-conducting piece and the heat transfer of adjacent battery unit 8, because heat transfer device is for promoting heat transfer performance, usually be the metal material, it has insulating heat-conducting piece to set up between heat transfer device and the battery unit 8, promote the security performance and guarantee to have sufficient heat transfer area to carry out the heat transfer with heat transfer device through heat-conducting piece and corresponding battery unit laminating setting, promote heat transfer performance.
The heat exchange device is particularly of a plate-shaped structure, a heat exchange channel is arranged in the heat exchange device and used for heat exchange fluid to flow through, a channel inlet and a channel outlet which are communicated with the heat exchange channel are further formed in the heat exchange device, a flow channel in the heat exchange device can be a single-flow channel flowing from one end of the heat exchange device to the other end of the heat exchange device, or the heat exchange device is divided into multiple flows which are transversely arranged, the heat exchange fluid flows in a circuitous mode between the adjacent flows, the specific structure of the heat exchange device is not limited too much, and the heat exchange devices of different structures can be adopted in different application environments of the heat exchange device.
It can be understood that the number of the first heat exchanging device 5, the second heat exchanging device 6 and the third heat exchanging device 7 can be flexibly adjusted according to the specific application environment and the heat exchanging requirement.
It should be noted that: although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can make modifications and substitutions on the present application, and all technical solutions and modifications thereof without departing from the spirit and scope of the present application should be covered by the claims of the present application.
Claims (10)
1. A heat exchange assembly comprises a first battery assembly and a first heat exchange unit which exchanges heat with the first battery assembly, the first battery assembly includes a plurality of battery cells, the first heat exchange unit includes a fluid inlet, a fluid outlet, a first expansion valve, and a plurality of heat exchange devices, the first expansion valve having a first expansion valve inlet and a first expansion valve outlet, the first expansion valve inlet in communication with the fluid inlet, it is characterized in that the heat exchange device at least comprises a first heat exchange device and two second heat exchange devices, one side surface of the first heat exchange device exchanges heat with the battery units, the second heat exchange device is positioned between the adjacent battery units, the first heat exchange means has a first passage inlet and a first passage outlet, at least one of the first passage inlets being in communication with the first expansion valve outlet.
2. A heat exchange assembly according to claim 1, wherein each of the second heat exchange means has a second channel inlet and a second channel outlet, respectively, at least one of the second channel inlets communicating with the first channel outlet.
3. The heat exchange assembly of claim 2, wherein there are more than two second heat exchange devices, each of the second heat exchange devices is arranged in parallel, and the second channel inlet of each of the second heat exchange devices is communicated with the first channel outlet; alternatively, the first and second electrodes may be,
the number of the second heat exchange devices is more than two, a second channel inlet of one second heat exchange device is communicated with the first channel outlet, and the second heat exchange devices are sequentially connected in series.
4. The heat exchange assembly of claim 1 wherein the first heat exchange means is two or more, the first channel inlet of at least one of the first heat exchange means is in communication with the second channel outlet of at least one of the second heat exchange means, and the first channel outlet of at least one of the first heat exchange means is in communication with the fluid outlet.
5. The heat exchange assembly of claim 1, wherein the number of the second heat exchange devices is two or more, the second heat exchange devices are arranged in parallel, and the second channel inlet of each of the second heat exchange devices is communicated with the first expansion valve outlet.
6. The heat exchange assembly of claim 1, further comprising a second expansion valve having a second expansion valve inlet and a second expansion valve outlet, and a distribution header having a header inlet and two or more header outlets, the second expansion valve inlet in communication with the fluid inlet, the second expansion valve outlet in communication with the header inlet, the second heat exchange device having two or more, the second channel inlet of each of the second heat exchange devices in communication with a corresponding header outlet.
7. A heat exchange assembly according to any one of claims 1 to 5, further comprising a second battery assembly and a second heat exchange unit for exchanging heat with the second battery assembly, the second heat exchange unit comprising a second expansion valve and at least one third heat exchange means, the second expansion valve having a second expansion valve inlet and a second expansion valve outlet, the second expansion valve inlet being in communication with the fluid inlet, the third heat exchange means having a third passage inlet and a third passage outlet, at least one of the third passage inlets being in communication with the second expansion valve outlet.
8. The heat exchange assembly of claim 7, wherein the number of the third heat exchange devices is two or more, the third channel inlet of one third heat exchange device is communicated with the outlet of the second expansion valve, and a plurality of third heat exchange devices are connected in series in sequence; or
The plurality of third heat exchange devices are arranged in parallel, and a third channel inlet of each third heat exchange device is communicated with an outlet of the second expansion valve.
9. The heat exchange assembly of claim 7, wherein the first heat exchange device, the second heat exchange device and the third heat exchange device are heat exchange devices with the same structure, the number of the first heat exchange devices is denoted by a, the number of the second heat exchange devices is denoted by b, the number of the third heat exchange devices is denoted by c, and a + b > c.
10. The heat exchange assembly of any one of claims 1 to 6, wherein the first heat exchange device and the second heat exchange device are plate-shaped structures, the second heat exchange device is vertically arranged, the first heat exchange device is horizontally arranged, two sides of the second heat exchange device are attached to the adjacent battery units through heat conducting members, and one side of the first heat exchange device is attached to the adjacent battery units through heat conducting members.
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| CN202011352100.2A CN114543393A (en) | 2020-11-27 | 2020-11-27 | Heat exchange assembly |
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| CN202011352100.2A CN114543393A (en) | 2020-11-27 | 2020-11-27 | Heat exchange assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024067855A1 (en) * | 2022-09-29 | 2024-04-04 | 比亚迪股份有限公司 | Thermal management system and vehicle having same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024067855A1 (en) * | 2022-09-29 | 2024-04-04 | 比亚迪股份有限公司 | Thermal management system and vehicle having same |
| WO2024067858A1 (en) * | 2022-09-29 | 2024-04-04 | 比亚迪股份有限公司 | Thermal management system and vehicle having same |
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