CN111370807A - Flexible heat exchange piece and battery pack heat dissipation device adopting same - Google Patents
Flexible heat exchange piece and battery pack heat dissipation device adopting same Download PDFInfo
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- CN111370807A CN111370807A CN202010156108.5A CN202010156108A CN111370807A CN 111370807 A CN111370807 A CN 111370807A CN 202010156108 A CN202010156108 A CN 202010156108A CN 111370807 A CN111370807 A CN 111370807A
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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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
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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
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
The invention discloses a flexible heat exchange piece, comprising: a media inlet flow conduit; a media outlet flow conduit; one or more flexible heat exchange tubes arranged in parallel between the media inlet flow conduit and the media outlet flow conduit, the flexible heat exchange tubes having one or more heat exchange segments arranged to wrap around an outer surface of a device to be heat exchanged. The invention also discloses a battery pack heat dissipation device adopting the flexible heat exchange piece. The micro-channel heat exchanger can be flexibly deformed and is tightly attached to the battery monomer, so that the heat dissipation effect is improved; and reduce coolant's use amount, reduce the heat abstractor volume, increased heat transfer area simultaneously, simple structure, energy utilization is high, does not have special requirement, can make it possess very big expansibility through increase and decrease pipeline and arranging. The micro-channel is changed into pressure processing integrated molding, so that the fluid channel can be formed without mechanical processing and welding. The microchannel tube wraps around the cell and can play a role of flexible support.
Description
Technical Field
The invention belongs to the field of electric vehicle battery thermal management, and particularly relates to a flexible heat exchange piece and an electric vehicle battery cooling device adopting the same.
Background
The power battery is used as the only energy source of the pure electric vehicle, the performance of the power battery directly influences the performance of the whole vehicle, the temperature is one of the main factors influencing the performance of the battery, and the performance of the battery is attenuated when the temperature is too high or too low. When the power battery is used, a large number of monomers need to be connected in series and parallel to meet the energy and power requirements of the whole vehicle. Meanwhile, the battery can generate a large amount of heat in the charging and discharging process, if the structural arrangement of the battery in the battery pack is poor and the heat dissipation performance is poor, the heat in the battery pack can be continuously accumulated during charging and discharging, so that the temperature of the battery can be continuously increased, and even thermal runaway can be caused; meanwhile, if the automobile scrapes or collides with the outside, the battery can be extruded or punctured, short circuit occurs inside the battery, a large amount of heat is generated in a short time, and the battery burns or explodes, so that the safety of the whole automobile is threatened.
The increase of the heat exchange area and the heat exchange coefficient is an effective means for increasing the heat exchange quantity of the water cooling plate. The heat exchange amount is a key factor for determining the performance of the water cooling plate, and experiments and theories prove that the heat exchange amount can be effectively increased by increasing the heat exchange area, the flow of the secondary refrigerant in the water cooling plate is reduced, the operating power of the system is further reduced, and the cost is reduced. The expression of the differential equation for thermal conductivity is:
the heat transfer and heat exchange quantity by convection is as follows:
Φ＝hAΔt(2)
simplified thermal conductivity resistance:
simplified heat resistance for convective heat transfer:
thus, the overall amount of heat exchange can be expressed as:
as can be seen from the formula (5), the heat exchange amount of the water-cooling plate is closely related to the heat exchange area and the heat transfer temperature difference. However, the conventional water-cooling plate adopts a secondary refrigerant flow channel formed by punch forming, so that the heat exchange area is small, the distance of the flow channel is long, the heat transfer temperature difference of the rear half part of the flow channel is small, and the heat dissipation result is not ideal.
The Reynolds number is calculated by the formula:
the heat transfer coefficient calculation formula can be expressed as:
the existing heat dissipation structure is low in heat exchange performance, independent installation space is needed, and installation requirements are high. According to the needs of the industry, more reliable, small, light in weight fills little heat exchanger, along with the development of electric automobile trade, has bigger development space.
Disclosure of Invention
The invention aims to provide a flexible heat exchange piece which is efficient, small in size and flexible in deformation, the shape of a heat exchange section of the flexible heat exchange piece can be adjusted according to the external shape of a device to be heated, the flexible heat exchange piece can be attached to the outer wall of the device to be heated in use, and the heat exchange efficiency is further improved.
Meanwhile, the invention also provides an electric vehicle battery radiator adopting the flexible heat exchange piece, the water-cooled micro-channel pipeline directly radiates the heat of the battery in a water-cooling mode, the space in the vehicle is reasonably utilized, and the micro-channel pipeline is tightly attached to the battery, so that the radiating plate has a higher radiating area and a better radiating effect.
In order to achieve the above purpose, the invention provides the following technical scheme:
a flexible heat exchange element comprising:
a media inlet flow conduit;
a media outlet flow conduit;
one or more flexible heat exchange tubes arranged in parallel between the media inlet flow conduit and the media outlet flow conduit, the flexible heat exchange tubes having one or more heat exchange segments arranged to wrap around an outer surface of a device to be heat exchanged.
When the flexible heat exchange tube is provided with the plurality of heat exchange sections, the plurality of heat exchange sections are connected sequentially through the connecting section, actually, the whole flexible heat exchange tube is of an integrated structure, and the heat exchange sections can be formed by bending according to the shape of the outer wall of a device to be heated.
The heat exchange medium enters the plurality of flexible heat exchange tubes with the heat exchange micro-channels through the medium inlet circulation pipeline respectively, finally flows back to the heat exchange medium driving and conveying assembly after being gathered through the medium outlet circulation pipeline, and enters the medium inlet circulation pipeline again under the driving of the heat exchange medium driving and conveying assembly, so that the heat exchange circulation of the next round is realized. And the plurality of flexible heat exchange tubes are connected in parallel between the medium inlet circulation pipeline and the medium outlet circulation pipeline, so that heat exchange (cooling or preheating) of the to-be-heated device is realized.
As an implementation scheme, a plurality of flexible heat exchange tubes are sequentially arranged in parallel or approximately arranged in parallel along the axial direction of a device to be heated. By adopting the scheme, uniform heat exchange of the to-be-heated device can be realized, so that the heat exchange efficiency is ensured, and the heat exchange quality can be ensured.
As an implementation scheme, when the number of the devices to be heated is multiple, each flexible heat exchange tube is sequentially provided with a heat exchange section corresponding to the device to be heated. The plurality of heat exchange devices may be arranged in parallel or approximately in parallel; the heat exchange of the corresponding part of each device to be heated can be realized through each flexible heat exchange tube.
As an implementation scheme, two adjacent heat exchange sections on each flexible heat exchange tube respectively correspond to half sides of two devices to be heated, and when the flexible heat exchange tube is used, each flexible tube is sequentially wound on the half sides of the devices to be heated. By adopting the scheme, the heat exchange section of the flexible heat exchange tube is convenient to machine and install.
As an implementation scheme, two adjacent heat exchange sections on each flexible heat exchange tube respectively correspond to the opposite half sides of two devices to be heated, and when the flexible heat exchange tube is used, each flexible tube sequentially winds the devices to be heated in a snake-shaped staggered mode. By adopting the scheme, on one hand, the heat exchange uniformity is further enhanced, and meanwhile, the installation stability of the flexible heat exchange tubes is also increased, and each flexible heat exchange tube is alternately positioned on two sides of the adjacent to-be-heated device during installation, so that a certain enhancement and stabilization effect is achieved.
The invention adopts the flexible heat exchange tube, when in application, the flexible heat exchange tube is coiled around the side surface of the device to be heated, and the inlet and the outlet of the flexible heat exchange tube are respectively connected with the medium inlet circulation pipeline and the medium outlet circulation pipeline to cool the side surface of the battery monomer.
The flexible heat exchange piece adopts the microchannel heat exchange tube, can be flexibly deformed, and can be placed on the upper end surface and the lower end surface of the battery and also can be attached to the outer surface of the battery column. Different from the traditional battery wrapped water cooling plate, only the lower end face of the battery is cooled.
As an implementation scheme, on each device to be heated, the heat exchange sections of the flexible heat exchange tubes are alternately arranged on two sides of the device to be heated. By adopting the technical scheme, the heat exchange uniformity is further improved. Therefore, the plurality of flexible heat exchange tubes form a grid structure, so that the heat exchange quality and efficiency are ensured, and the integral installation strength is also enhanced.
Preferably, the inner diameter of the flexible heat exchange tube is less than or equal to 1 mm. The flexibility of the heat exchange tube is ensured, the heat exchange area is greatly increased, and the heat exchange efficiency is enhanced.
As an embodiment, the medium inlet flow conduit, the medium outlet flow conduit or the flexible heat exchange tube is a metal tube, preferably a copper or aluminum tube. Preferably, the medium inlet circulation pipeline, the medium outlet circulation pipeline or the flexible heat exchange pipe are copper pipes, the flexible heat exchange pipe is a copper micro-channel circular pipe, the geometric shape of the flexible heat exchange pipe can be changed, the contact area of the heat exchanger and the battery is increased, and the heat exchange efficiency is improved. It is therefore a flexible water cooled plate heat exchanger.
As an implementation scheme, the outer wall of the flexible heat exchange tube is wrapped with insulating glue. Preventing electric leakage.
The invention also provides a battery pack heat dissipation device which comprises a heat dissipation medium driving and conveying assembly and a water cooling plate forming a circulating heat exchange loop with the heat dissipation medium driving and conveying assembly, wherein the water cooling plate is the flexible heat exchange piece in any one of the technical schemes. The heat dissipation medium driving and conveying assembly mainly comprises a driving pump, a pipeline, a relevant valve and the like, and can also comprise an automatic controller (which can be a computer, a control chip, an integrated circuit and the like), and the existing driving piece and control piece can be adopted.
The battery pack can be a battery pack or a battery pack of various electric parts, and specific applications include battery packs of electric automobiles and the like. The shape of the battery pack may be various shapes, and examples thereof include a cylindrical battery, a rectangular parallelepiped battery, a square battery, a sheet battery, an oval cylindrical battery, and a triangular cylindrical battery. The shape of the heat exchange section is mainly determined by the shape of the device to be heated, when a battery pack with a symmetrical structure is selected, each heat exchange section can be processed into the shape of the outer wall of the cross section of a half device to be heated, for example, for a cylindrical device to be heated, the heat exchange section can be processed into a semicircular structure and corresponds to the arc shape of the corresponding cylindrical outer wall. The shape and the quantity of the heat exchange tubes can be adjusted according to the shape and the quantity of the batteries, and the effective fit of the surfaces of the batteries is realized. For example, for a cylindrical heat exchange element, the heat exchange section is generally in the shape of a circular arc.
The heat exchange piece provided by the invention has the advantages of small volume, light weight and high heat exchange efficiency, and the flexible heat exchange piece (as a flexible water cooling plate) is used as a heat dissipation water cooling plate of the battery pack of the electric automobile, so that the flexible heat exchange piece does not occupy space, has good compactness and large heat exchange area. The flexible heat exchange part realizes heat exchange through a cooling medium and comprises a micro-channel flexible heat exchange tube, a medium inlet circulation pipeline and a medium outlet circulation pipeline, wherein the micro-channel flexible heat exchange tube is attached to the side face of the single battery in a snake shape, the flexible micro-channel water cooling pipeline is arranged in parallel, the snake shape is wound on the side face of the single battery, an inlet and an outlet are respectively connected to one medium circulation pipeline, and the side face of the single battery is cooled. The diameter of the pipeline of the flexible heat exchange tube of the micro-channel is less than or equal to 1mm, and the length and the diameter of the specific pipeline are determined according to the specific size of the battery pack. The microchannel flexible heat exchange tube adopts a metal round tube and adopts a form that a plurality of pipelines are arranged in parallel. The cooling medium flows into each micro-channel flexible heat exchange tube through a medium inlet circulation pipeline on one side, takes away heat generated by the battery, flows to a medium outlet circulation pipeline on the other side, and then flows into the automotive air conditioning evaporation heat exchanger for cooling.
A medium inlet circulation pipeline in the flexible heat exchange piece is provided with a cooling medium inlet, and a medium outlet circulation pipeline at the other end is provided with a cooling medium outlet. The heat exchange piece enters a cooling medium from a cooling medium inlet on one side, then circulates in the whole heat exchange piece, and finally flows out through a cooling medium outlet.
According to the invention, as the optimization of the scheme, the flexible heat exchange piece adopts the copper micro-channel circular tube, the geometric shape of the flexible heat exchange tube can be changed, the contact area between the heat exchange piece and the battery is increased, the heat exchange efficiency is improved, the volume of the radiator is further reduced, and the heat radiation effect is enhanced.
In the invention, as the optimization of the scheme, the microchannel flexible heat exchange tube in the flexible heat exchange piece is connected with the medium inlet circulation pipeline and the medium outlet circulation pipeline in a welding mode, so that liquid leakage is prevented.
According to the invention, as the optimization of the scheme, the micro-through flexible heat exchange tubes in the flexible heat exchange piece are reinforced by the reinforcing ribs.
In the invention, preferably, the diameter of the microchannel flexible heat exchange tube is less than 1mm, and the specific length and diameter of the microchannel flexible heat exchange tube are determined according to the specific size of the battery pack.
In the preferable mode of the scheme, the microchannel tube is a metal round tube, and a plurality of pipelines are arranged in parallel.
The density of the heat exchange tubes in the microchannel heat exchange piece can be adjusted by changing the space between the tubes, and the density can be adjusted according to the required heat exchange amount and the operation pressure.
The advantages and the beneficial effects of the invention are as follows:
the micro-channel heat exchange piece adopted by the invention can be flexibly deformed, can be tightly attached to a battery monomer, is different from a traditional battery wrapped water cooling plate, and can only cool the lower surface of the battery. The invention reduces the using amount of cooling medium, reduces the volume of the heat radiating device, increases the heat exchange area, improves the heat radiating effect, has simple structure, convenient realization and high energy utilization rate, has no special requirements on other parts of the cooling device, and can ensure that the cooling device has great expansibility by increasing or decreasing pipelines and arranging. The micro-channel is changed into pressure processing integrated molding, so that the fluid channel can be formed without mechanical processing and welding. The microchannel tube wraps around the cell and can play a role of flexible support.
The micro-channel heat exchange piece is used as the flexible water cooling plate of the electric automobile, the structure is simple, the realization is convenient, the energy utilization rate is high, no special requirements are required for other parts of the cooling device, the heat dissipation effect is uniform, the laminating area of the battery is large, the structure is compact, and the heat exchange effect is strong. By adopting the micro-channel heat exchange part structure, the problem that the heat exchange quantity of the traditional water cooling plate is insufficient can be effectively solved, the cooling capacity of the battery heat dissipation device is improved, and the micro-channel heat exchange part structure can have great expansibility by increasing and decreasing pipelines and arranging. In addition, the invention is formed by splicing a plurality of flexible water-cooling plates, so a plurality of parts of the radiator can be disassembled to facilitate maintenance and replacement, and the invention has the advantages of longer service life and low cost. The battery box body of the electric automobile has small inner space, the micro-channel heat exchanger is adopted as a water cooling plate, the size of the battery pack can be effectively reduced, the space utilization rate of the battery box body is increased, the weight of the whole automobile is reduced, and the power consumption of the whole automobile during operation is reduced. Therefore, the invention has the characteristics of good heat dissipation effect, low cost and small volume, and has wide application prospect in the electric automobile market.
Drawings
FIG. 1 is a schematic view of a flexible water cooling plate in contact with a battery according to the present invention;
FIG. 2 is a top view of the present invention shown in FIG. 1;
FIG. 3 is a schematic diagram of a flexible water-cooling plate structure according to the present invention;
fig. 4 is a schematic structural diagram of a conventional battery water-cooling plate.
Wherein, 1, medium inlet circulation pipeline; 2. a flexible heat exchange tube on the side of the battery; 21-2 n, n micro-channel flexible heat exchange tubes; 3. a battery cell; 31-3 m, m battery monomers; 4. the medium outlet is communicated with a pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present invention.
As shown in fig. 2 and 3, a flexible heat exchange member includes: a medium inlet flow conduit 1; a medium outlet flow conduit 4; and one or more flexible heat exchange tubes 2 arranged in parallel between the medium inlet flow conduit and the medium outlet flow conduit, the flexible heat exchange tubes having one or more heat exchange segments arranged to be capable of being wrapped around the outer surface of the device to be heat exchanged.
Wherein the plurality of flexible heat exchange tubes are sequentially arranged in parallel or approximately arranged in parallel along the axial direction of the device to be heated. When the number of the devices to be heated is multiple, each flexible heat exchange tube is sequentially provided with a heat exchange section corresponding to the device to be heated. In the figure, the heat exchange section is in a circular arc structure and can be used for heat dissipation cooling or preheating of a cylindrical heat exchange element and the like. Of course, according to the different shapes of the heat exchange elements, the shapes of the heat exchange sections can be adjusted, so that the heat exchange sections are more attached to the outer walls of the heat exchange elements, and efficient heat exchange is realized.
Two adjacent heat exchange sections on each flexible heat exchange tube respectively correspond to the half sides of two devices to be heated, and when the heat exchanger is used, each flexible tube is sequentially wound on the half sides of the devices to be heated. For cylindrical heat exchange elements or heat exchanger pieces, the heat exchange sections are of corresponding arc semicircular structures.
Two adjacent heat exchange sections on each flexible heat exchange tube respectively correspond to the opposite half sides of two devices to be heated, and when the flexible heat exchange tube is used, each flexible tube sequentially winds the devices to be heated in a snake-shaped staggered mode. The heat exchange sections of the flexible heat exchange tubes are alternately arranged on two sides of the device to be heated.
As shown in fig. 1, the heat dissipation apparatus for an electric vehicle battery pack using a flexible water cooling plate generally includes a heat dissipation medium driving and conveying assembly, and a water cooling plate forming a circulating heat exchange loop with the heat dissipation medium driving and conveying assembly, wherein the water cooling plate uses the flexible heat exchange member; this flexible heat transfer spare is including hugging closely battery monomer 3 (in the embodiment, set up a plurality ofly, be battery monomer 31 ~ 3m in proper order) many microchannel flexible heat exchange tubes 2 (be flexible heat exchange tube 21 ~ 2n in proper order) of side surface, a plurality of flexible heat exchange tube is arranged along battery monomer 3 axial parallel in proper order to and medium entry runner pipe 1, medium export runner pipe 4, medium entry runner pipe, medium export runner pipe pass through the welding mode with microchannel flexible heat exchange tube both ends respectively and are connected. When the device runs, a cooling medium uniformly flows through the micro-channel flexible heat exchange tubes 21-2 n through the medium inlet circulation pipeline 1 and finally collects to the medium outlet circulation pipeline 4, and the micro-channel flexible heat exchange tubes 21-2 n are wound on the side surface of the battery monomer 3 in a snake shape. The number of the flexible heat exchange tubes can be adjusted according to the requirement.
In this embodiment, among the flexible heat transfer piece, the outside parcel insulating cement of microchannel flexible heat exchange tube 21 ~ 2n prevents the 3 electric leakages of battery monomer.
In the embodiment, two ends of the micro-channel flexible heat exchange tube 21-2 n are respectively connected with the medium inlet circulation pipeline 1 and the medium outlet circulation pipeline 4 in a welding mode, so that cooling medium leakage is prevented.
In this embodiment, the microchannel flexible heat exchange tubes 21 to 2n, the medium inlet circulation pipeline 1 and the medium outlet circulation pipeline 4 are made of copper or aluminum, and the cooling medium is a 50% glycol solution.
In this embodiment, the microchannel flexible heat exchange tube in the flexible heat exchange member can be reinforced by reinforcing ribs, so that the breakage in the running process of an automobile is prevented.
In the embodiment, the diameter of the pipeline of the micro-channel flexible heat exchange tube 21-2 n is smaller than 1mm, and the specific length and diameter of the pipeline are determined according to the specific size of the battery pack.
In the embodiment, the cooling medium enters the micro-channel flexible heat exchange tubes 21-2 n through the medium inlet circulation pipeline 1, cools the side faces of the batteries, returns to the medium outlet circulation pipeline 4, returns to the vehicle interior air conditioner heat exchanger through the sealing pipeline for cooling, and finally returns to the medium inlet circulation pipeline 1, and the steps are repeated in sequence, so that the heat dissipation effect is uniform, the bonding area with the battery monomer 3 is large, the structure is compact, and the heat exchange effect is strong. In addition, the micro-channel pipeline is adopted, so that the heat dissipation device has the characteristics of good heat dissipation effect, low cost and small size, all the parts can be disassembled to facilitate maintenance and replacement, the service life is longer, the cost is low, and the micro-channel pipeline has a wide application prospect in the electric automobile market.
In order to further embody the advantages of the technical solution of the present invention, according to the formula (5) in the background art, the heat load calculation is performed on a battery water-cooling plate of a certain company, as shown in fig. 4. The traditional water-cooling plate consists of an upper part and a lower part, a flow channel is punched on the upper plate I by adopting a punching process, then the upper plate I and the lower plate II are welded and formed, two streams of fluid respectively flow in from two inlets on one side, and flow out from two outlets on the other side, so that the lower surface of a battery pack is cooled. According to the Reynolds number obtained by calculation, the traditional water cooling plate and the battery pack heat dissipation device of the electric automobile with the flexible heat exchange tube are indicated that the secondary refrigerant is laminar flow. Working medium adopts 50% concentration ethylene glycol solution, under given working condition (25 ℃ inlet water temperature, battery constant temperature 35 ℃) and flow rate (1.36L/min), the water temperature at the outlet of the traditional water cooling plate is calculated to obtain 32.96 ℃ and the heat exchange amount is 637.74W. The flexible heat exchange tube adopting the structure of the invention is adopted to carry out heat load calculation under the same working condition, and the water temperature at the outlet of the flexible heat exchange tube is 37.47 ℃, and the heat exchange quantity is 999.07W. The heat exchange performance of the battery pack heat dissipation device of the electric automobile adopting the flexible heat exchange tubes is improved by 56.7%.
According to the formula (7), the heat exchange coefficient of the traditional water-cooling plate can be calculated to be 537.6W/m2K, the heat exchange coefficient of the battery pack heat dissipation device of the electric automobile with the flexible heat exchange tubes is 3698.53W/m2K. Compared with the traditional water cooling plate, the heat exchange coefficient of the electric vehicle battery pack heat dissipation device adopting the flexible heat exchange tubes is improved by more than 5 times.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A flexible heat exchange element, comprising:
a media inlet flow conduit;
a media outlet flow conduit;
one or more flexible heat exchange tubes arranged in parallel between the media inlet flow conduit and the media outlet flow conduit, the flexible heat exchange tubes having one or more heat exchange segments arranged to wrap around an outer surface of a device to be heat exchanged.
2. The flexible heat exchange element of claim 1, wherein the plurality of flexible heat exchange tubes are sequentially arranged in parallel or approximately arranged in parallel along the axial direction of the element to be heated.
3. The flexible heat exchange member according to claim 1, wherein when the number of the devices to be heated is plural, each flexible heat exchange tube is provided with a heat exchange segment corresponding to the device to be heated in sequence.
4. A flexible heat exchange member according to claim 3, wherein two adjacent heat exchange sections on each flexible heat exchange tube correspond to half sides of two devices to be heated respectively, and in use, each flexible tube is wound on the half sides of the devices to be heated in turn.
5. A flexible heat exchange member according to claim 3 or 4, wherein two adjacent heat exchange sections on each flexible heat exchange tube respectively correspond to opposite half sides of two devices to be heated, and when in use, each flexible tube is sequentially wound on the devices to be heated in a snake-shaped staggered manner.
6. The flexible heat exchange member as claimed in claim 3, wherein the heat exchange sections of the plurality of flexible heat exchange tubes are alternately arranged on both sides of the device to be heat exchanged on each device to be heat exchanged.
7. A flexible heat exchange element according to claim 1, wherein the flexible heat exchange tube has an internal diameter of 1mm or less.
8. The flexible heat exchange element of claim 1 wherein the media inlet flow conduit, media outlet flow conduit or flexible heat exchange tube is a metal tube.
9. The flexible heat exchange element of claim 1 wherein the outer wall of the flexible heat exchange tube is coated with an insulating adhesive.
10. A battery pack heat dissipation device comprises a heat dissipation medium driving and conveying assembly and a water cooling plate forming a circulating heat exchange loop with the heat dissipation medium driving and conveying assembly, and is characterized in that the water cooling plate is a flexible heat exchange piece according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115911653A (en) * | 2022-11-23 | 2023-04-04 | 上海弈卡新能源科技有限公司 | Flexible heat exchanger |
| DE102022100744A1 (en) | 2022-01-13 | 2023-07-13 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Battery cell assembly and cooling element |
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Inventor after: Bi Xiangyu Inventor after: Zhou Wenjie Inventor after: Fang Xinqi Inventor after: Gan Zhihua Inventor after: Pan Qingyao Inventor before: Bi Xiangyu Inventor before: Zhou Wenjie Inventor before: Fang Xinqi Inventor before: Gan Zhihua |
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Application publication date: 20200703 |