WO2022053267A1 - Agencement de refroidissement et agencement de batterie ayant un élément élastique pour appliquer une force à un milieu de conduction thermique - Google Patents

Agencement de refroidissement et agencement de batterie ayant un élément élastique pour appliquer une force à un milieu de conduction thermique Download PDF

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Publication number
WO2022053267A1
WO2022053267A1 PCT/EP2021/072822 EP2021072822W WO2022053267A1 WO 2022053267 A1 WO2022053267 A1 WO 2022053267A1 EP 2021072822 W EP2021072822 W EP 2021072822W WO 2022053267 A1 WO2022053267 A1 WO 2022053267A1
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WO
WIPO (PCT)
Prior art keywords
heat
thermally conductive
coupling surface
designed
medium
Prior art date
Application number
PCT/EP2021/072822
Other languages
German (de)
English (en)
Inventor
Dirk Schroeter
Original Assignee
Daimler Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2022053267A1 publication Critical patent/WO2022053267A1/fr

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the invention relates to a cooling arrangement for dissipating heat from a heat source to a heat sink with a heat-conducting medium which has a first coupling surface designed for thermal coupling with the heat source and a second coupling surface for thermal coupling with the heat sink, the heat-conducting medium being designed as a foil, and a fastening unit, which is designed to fasten the thermally conductive medium to the heat source via the first coupling surface and/or to the heat sink via the second coupling surface.
  • the component to be cooled or the heat source can in particular be a traction battery of an electrically operated motor vehicle or at least one battery cell of such a traction battery.
  • a disadvantage of thermal coupling via thermally conductive paste or thermally conductive filling material is that cavities that occur between the heat source and heat sink must be largely or completely filled with it.
  • thermally conductive mats are known as a further development, which in particular have a small thickness, ie are designed as a film.
  • a thermally conductive mat can be designed, for example, as a so-called "tube mat", which is essentially formed by a large number of adjacent tubes. Deformation of the tubes ensures a certain tolerance compensation between the thermally conductive mat and a surface of the heat sink and/or a surface of the heat source. In other words, by deforming the tubes, at least a certain "snug fit" can be achieved.
  • Essentially incompressible thermally conductive foils which can be made of carbon in particular, are also known.
  • thermally conductive film is marketed, for example, under the brand name eGRAF® SPREADERSHIELDTM. Due to the extremely small thickness of such a thermally conductive foil and its largely non-existent compressibility, heat transfer from the heat source to the thermally conductive foil and/or from the thermally conductive foil to the heat sink is not optimal. This is reinforced in particular by the fact that such thermally conductive foils can only ensure optimum heat dissipation within an area spanned by the thermally conductive foil.
  • the heat dissipation or the thermal conductivity perpendicular to the surface or parallel to a normal vector is many times worse, for example by a factor of 300, compared with a thermal conductivity parallel to the surface.
  • the invention is based on a cooling arrangement for dissipating heat from a heat source to a heat sink with a heat-conducting medium which has a first coupling surface designed for thermal coupling to the heat source and a second coupling surface designed for thermal coupling to the heat sink, the heat-conducting medium being a film is executed, and a fastening unit, which is designed to arrange the heat-conducting medium via the first coupling surface on the heat source and/or via the second coupling surface on the heat sink.
  • the fastening unit has at least one elastic element, wherein the at least one elastic element is designed to exert a force on the heat-conducting medium.
  • the at least one elastic element is designed to exert the force on the first coupling surface or the second coupling surface.
  • the fastening unit or the elastic element can be designed to to apply the force. This force can enable improved thermal coupling of the heat-conducting medium to the heat source and/or the heat sink.
  • a contact pressure resulting from the force of the fastening unit or the at least one elastic element can enable thermal coupling between the heat-conducting medium and the heat source and/or between the heat-conducting medium and the heat sink in an improved manner.
  • the thermally conductive medium is designed as a foil.
  • the thermally conductive medium can therefore also be referred to as a thermally conductive foil.
  • the thermally conductive medium is distinguished in particular by the fact that it has a small thickness, for example less than 10 millimeters, less than 5 millimeters, less than 1 millimeter or less than 0.5 millimeters.
  • An even thinner design of the thermally conductive foil or the thermally conductive medium with a thickness of less than 100 micrometers, less than 50 micrometers or less than 20 micrometers is also possible.
  • the thickness is in particular that expansion of the thermally conductive medium or the thermally conductive foil parallel to a surface normal or a normal vector of a surface of the thermally conductive foil or the thermally conductive medium.
  • the thickness can be that dimension which runs perpendicularly to the surface of the thermally conductive medium or the thermally conductive foil.
  • An expansion of the surface of the thermally conductive medium or the thermally conductive foil is in particular at least by a factor of 10, at least by a factor of 100, at least by a factor of 1000 or at least by a factor of 10,000 greater than the thickness.
  • the thermally conductive medium or the thermally conductive foil can have an anisotropic thermal conductivity.
  • a thermal conductivity parallel to the surface is in particular greater than a thermal conductivity perpendicular to the surface.
  • the thermal conductivity parallel to the surface can be greater by at least a factor of 10, at least by a factor of 50 or at least by a factor of 100 than the thermal conductivity perpendicular to the surface.
  • the ratio of the stated thermal conductivities can be 1:300.
  • the first and/or the second coupling surface can each be flat or curved. In other words, it can be provided that the first coupling surface is flat or curved. It can also be provided that the second coupling surface is flat or curved.
  • the fastening unit has a multiplicity of elastic elements corresponding to the at least one elastic element. All features that are disclosed in the present application in relation to the at least one elastic element also apply analogously to the multiplicity of elastic elements.
  • a first subset of elastic elements of the plurality can be designed to exert the force on the first coupling surface or on the heat-conducting medium in the area of the first coupling surface.
  • a second subset of the plurality of elastic elements can be designed to exert the force on the second coupling surface or on the heat-conducting medium in the area of the second coupling surface.
  • the first subset of elastic elements can be designed to apply a force or pressure to the first coupling surface or to the heat-conducting medium in the region of the first coupling surface.
  • the second subset of elastic elements can be designed to apply a force or pressure to the second coupling surface or to the heat-conducting medium in the region of the second coupling surface.
  • the elastic elements of the first subset can thus be designed to press the heat-conducting medium against the heat source.
  • the elastic elements of the second subset can be designed to press the heat-conducting medium against the heat sink. It can be provided that the first subset and the second subset partially overlap or that both subsets do not overlap. In other words, it can be provided that a respective elastic element of the plurality is only part of one of the two subsets.
  • the first subset can have one or more elastic elements.
  • the second subset may include one or more elastic members.
  • the at least one elastic element or a plurality of elastic elements are designed to exert the force both on the first coupling surface and on the second coupling surface.
  • a respective elastic element for applying force or pressure to the heat-conducting medium is formed both in the area of the first coupling surface and in the area of the second coupling surface.
  • a respective elastic element can thus be designed to press the heat-conducting medium both against the heat source and against the heat sink.
  • the heat sink can in particular be a heat exchanger or a heat exchanger of a cooling system.
  • the heat sink can be air-cooled or water-cooled for this purpose.
  • the heat sink can be designed as a cooling block with cooling fins.
  • the heat sink can have one or more fluid channels for a cooling fluid to flow through.
  • the thermally conductive medium is at least essentially incompressible parallel to a normal vector of the thermally conductive medium designed as a film.
  • the thickness of the thermally conductive medium or the thermally conductive foil is at least essentially constant, regardless of the pressurization of the thermally conductive medium or the thermally conductive foil.
  • the thermally conductive medium or the thermally conductive foil is incompressible or at least essentially incompressible perpendicular to the surface.
  • the thermally conductive medium can be completely or substantially incompressible parallel to the normal vector. Such an embodiment of the thermally conductive medium can ensure that no deformation results from the application of pressure or the force of the at least one elastic element.
  • the thermally conductive medium is designed relative to the elastic element in such a way that the force on the thermally conductive medium is aligned at least essentially parallel to the direction of the normal vector of the thermally conductive medium designed as a film. At least essentially means in particular that the force runs completely or essentially parallel to the direction of the normal vector.
  • the at least one elastic element for introducing the force onto the heat-conducting medium is configured at least essentially parallel to the direction of the normal vector of the heat-conducting medium designed as a film. At least one elastic element is thus formed perpendicular to the force application or at least substantially perpendicular to the surface of the heat conducting medium or the heat conducting foil.
  • the force can be particularly defined and advantageously aligned to improve the thermal coupling with the heat source and/or the heat sink.
  • the at least one elastic element for introducing the force is designed perpendicularly or at least essentially perpendicularly to the surface of the first and/or second coupling surface.
  • the elastic elements of the first subset for introducing the force are formed perpendicularly to the surface of the first coupling surface and/or the elastic elements of the second subset for introducing the force are formed perpendicularly to the surface of the second coupling surface.
  • the heat-conducting medium is formed at least by a graphite-containing foil.
  • the thermally conductive medium or the thermally conductive foil can be formed at least partially from carbon or graphite.
  • the thermally conductive medium or the thermally conductive foil can consist entirely of graphite or carbon or contain one or more other materials in addition to graphite or plastic.
  • a particularly high thermal conductivity, in particular parallel to the surface can result from such a carbon-containing or graphite-containing design of the heat-conducting medium.
  • the thermal conductivity parallel to the surface can be greater than the thermal conductivity of copper, for example by a factor of 2 or 4 greater than the thermal conductivity of copper. For this reason, such a heat-conducting medium is particularly suitable for enabling the cooling arrangement to be designed in a material-saving and therefore light-weight manner.
  • the heat-conducting medium has an electrically insulating coating.
  • the electrically insulating coating can be applied to one side or two sides of the thermally conductive medium. In other words, it can be provided that the electrically insulating coating is inseparably connected to the heat-conducting medium.
  • the electrically insulating coating can be provided by an additional electrically insulating film.
  • the electrically insulating film can be arranged, for example, on one side or on both sides of the heat-conducting medium. In this case, the electrically insulating film can be arranged parallel to the surface of the heat-conducting medium or the heat-conducting film. To this way, security can be increased and the possibility of undesired short circuits reduced.
  • the at least one elastic element is formed at least from foam.
  • the at least one elastic element can be formed entirely from foam or from foam and one or more materials.
  • the foam is in particular particularly light, particularly inexpensive and able to reliably exert the force on the thermally conductive medium.
  • the fastening unit can thus have foam to provide the at least one elastic element.
  • a second aspect of the present invention relates to a battery arrangement for providing electrical energy for a motor vehicle.
  • the battery arrangement according to the invention has the cooling arrangement according to the invention.
  • the battery arrangement has at least one battery cell as the heat source and the heat sink.
  • the thermally conductive medium is thermally coupled to the at least one battery cell via the first coupling surface and to the heat sink via the second coupling surface.
  • the fastening unit or the at least one elastic element is designed to exert the force on the heat-conducting medium and in particular to press the heat-conducting medium against the at least one battery cell in the region of the first coupling surface and/or against the heat sink in the region of the second coupling surface.
  • the at least one elastic element can be designed to press the heat-conducting medium against the at least one battery cell and/or against the heat sink.
  • the at least one elastic element can thus indirectly exert a force on the at least one battery cell and/or the heat sink.
  • the at least one elastic element applies a contact pressure to the first coupling surface on the at least one battery cell and/or applies a contact pressure to the heat sink on the second coupling surface.
  • the at least one elastic element is designed to press the first coupling surface with the contact pressure against the at least one battery cell and/or the second coupling surface with the To press contact pressure against the heat sink.
  • the at least one elastic element can be designed to indirectly apply the respective contact pressure to the at least one battery cell and/or the heat sink. In this way, optimal heat dissipation via the respective coupling surface is made possible.
  • the fastening unit has a plurality of elastic elements, with the first subset of the elastic elements being designed to apply the contact pressure to the first coupling surface on the at least one battery cell, and the second subset of the elastic elements being designed to to apply the contact pressure to the heat sink on the second coupling surface.
  • one or more elastic elements of the first subset can be designed to press the first coupling surface against the at least one battery cell with the contact pressure.
  • one or more elastic elements of the second subset can be designed to press the second coupling surface against the heat sink with the contact pressure. In this way, a contact pressure that is optimized in each case is ensured both in the area of the first coupling surface and in the area of the second coupling surface.
  • the at least one elastic element borders the first coupling surface of the heat-conducting medium with a first side and borders the second coupling surface of the heat-conducting medium with a second side facing away from the first side.
  • the at least one elastic element can be surrounded by the thermally conductive medium both on the first side and on the second side.
  • the at least one elastic element can be designed to exert the force on the first coupling surface on the first side and/or to exert the force on the second coupling surface on the second side. In particular, the forces exerted on the two sides are opposed to one another. This results in a particularly simple structure with a small number of elastic elements.
  • the thermally conductive medium can be routed around the at least one elastic element and, in the case of a plurality of elastic elements, around all the elastic elements.
  • the heat-conducting medium thus encloses the elastic element from at least two sides.
  • the thermally conductive medium can be folded over or form two surfaces that run at least substantially parallel to one another.
  • the first and the second coupling surface can in this case be parallel and/or overlap one another.
  • a further aspect of the present invention relates to a motor vehicle, in particular a motor vehicle that can be operated electrically, which has the battery arrangement according to the invention.
  • the at least one battery cell of the battery arrangement is part of a traction battery.
  • the at least one battery cell or the traction battery is designed to provide electrical energy for a drive of the motor vehicle, for example an electric motor.
  • the motor vehicle can be designed, for example, as a hybrid vehicle, as a battery electric vehicle or as a hydrogen vehicle or fuel cell vehicle.
  • the at least one battery cell or the traction battery can be designed as a buffer store for temporarily storing electrical energy that is generated by a fuel cell.
  • cooling arrangement according to the invention in the battery arrangement according to the invention or in the motor vehicle according to the invention is to be understood purely as an example.
  • An application of the cooling arrangement for cooling other components in the entire field of electrics and mechanical engineering is also possible and is disclosed by the present application.
  • any electrical or mechanical component to be cooled can act as a heat source in the cooling assembly.
  • the cooling arrangement can thus be designed to cool any component to be cooled or to dissipate heat from it.
  • a further aspect of the invention relates to a method for producing a cooling arrangement for dissipating heat from a heat source to a heat sink, with the following steps:
  • thermally conductive medium between the heat source and the heat sink, wherein the thermally conductive medium is designed as a foil
  • the thermal coupling is established by at least one elastic element, with a force being exerted on the heat-conducting medium by the at least one elastic element.
  • FIG. 1 shows a first exemplary embodiment of a cooling arrangement for dissipating heat from a heat source in an extremely schematic sectional view
  • FIG. 2 shows a second exemplary embodiment of the cooling arrangement in an extremely schematic sectional view
  • FIG 3 shows a third exemplary embodiment of the cooling arrangement in an extremely schematic sectional view.
  • the cooling arrangement 1 is part of a battery arrangement 2 for providing electrical energy for a motor vehicle.
  • the heat source is a cell block which has one or more battery cells.
  • the heat source 4 can be a component to be cooled, in particular an electrical or mechanical component.
  • the task of the cooling arrangement 1 is to dissipate heat from the heat source 4 to the heat sink 5 .
  • the cooling arrangement 1 enables the heat source 4 to be cooled for example, be a heat exchanger or a heat exchanger.
  • the heat sink 5 is designed to emit or transfer the heat transferred from the heat source 4 to a cooling medium.
  • the cooling medium can be, for example, ambient air, an air flow, a cooling liquid or a coolant or the like.
  • the heat sink 5 can thus be designed, for example, as an air heat exchanger or as a fluid heat exchanger.
  • the heat sink 5 has coolant connections 9 .
  • the coolant connections 9 allow a coolant to circulate in the heat sink 5.
  • the heat sink is thus designed to transfer or release the heat transmitted from the heat source 4 to the coolant.
  • the cooling arrangement 1 has a heat-conducting medium 3 .
  • the thermally conductive medium 3 has a first coupling surface 16 for thermal coupling to the heat source 4 and a second coupling surface 17 for thermal coupling to the heat sink 5 .
  • the thermally conductive medium 3 can also have a plurality of first coupling surfaces 16 and/or a plurality of second coupling surfaces 17 (see FIG. 1).
  • the heat-conducting medium 3 is thermally coupled to the heat source 4, in particular the at least one battery cell, in the region of the first coupling surface 16 or via the first coupling surface 16.
  • the heat-conducting medium 3 is thermally coupled to the heat sink 5 via the second coupling surface 17 or in the region of the second coupling surface 17 .
  • the heat-conducting medium 3 is thus designed to dissipate or receive heat from the heat source 4 via the first coupling surface 16 or via the first coupling surfaces 16 .
  • the heat-conducting medium 3 is designed to transfer or emit heat to the heat sink 5 via the second coupling surface 17 or the second coupling surfaces 17 .
  • the heat-conducting medium 3 thus enables the flow of heat or the transfer of heat from the heat source 4 to the heat sink 5.
  • the heat from the heat source 4 can be dissipated through the heat sink 5 via the heat-conducting medium 3 as intended.
  • the thermally conductive medium 3 is designed as a thermally conductive foil.
  • the thermally conductive medium 3 is thus characterized in particular by the fact that it has a small thickness, for example less than 10 millimeters, less than 5 millimeters, less than 1 millimeter or less than 0.5 millimeters. Also an even thinner version of the Thermally conductive foil 3 or the thermally conductive medium with a thickness of less than 100 micrometers, less than 50 micrometers or less than 20 micrometers is possible. The thickness is in particular that extent of the thermally conductive medium 3 or the thermally conductive foil that runs perpendicular to the surface of the thermally conductive medium 3 or the thermally conductive foil.
  • An expansion of the surface of the thermally conductive medium or the thermally conductive foil is in particular at least by a factor of 10, at least by a factor of 100, at least by a factor of 1000 or at least by a factor of 10,000 greater than the thickness. 10,000 times larger than the thickness.
  • the thermally conductive medium 3 or the thermally conductive foil is designed as a graphite-containing foil, for example.
  • the thermally conductive medium or the thermally conductive foil is formed at least partially from carbon or graphite.
  • the thermally conductive medium or the thermally conductive foil can consist entirely of graphite or carbon or contain one or more other materials in addition to graphite or plastic.
  • Such a carbon-containing or graphite-containing design of the heat-conducting medium results in a particularly high thermal conductivity, in particular parallel to the surface.
  • the thermal conductivity parallel to the surface is greater than the thermal conductivity of copper, for example greater than the thermal conductivity of copper by a factor of 2 or 4.
  • thermally conductive film is marketed, for example, under the brand name “eGRAF® SPREADERSHIELDTM”.
  • the thermally conductive medium 3 can have the “eGRAF® SPREADERSHIELDTM” film or be formed from it.
  • the thermally conductive medium 3 or the thermally conductive foil has an anisotropic thermal conductivity.
  • a thermal conductivity parallel to the surface of the thermally conductive medium 3 is in particular greater than a thermal conductivity perpendicular to the surface of the thermally conductive medium 3.
  • the thermal conductivity parallel to the surface can be at least 10 times greater, at least 50 times greater, or at least 100 times greater than the thermal conductivity perpendicular to the surface.
  • the ratio of the stated thermal conductivities can be 1:300. For this reason, it is particularly important to optimize heat transfer at the first coupling surface and/or at the second coupling surface.
  • the thermally conductive medium 3 can also have an electrically insulating coating.
  • the thermally conductive medium 3 can be surrounded or framed by an electrically insulating film on one or both sides.
  • the coating can be applied directly to the thermally conductive medium 3 .
  • the cooling arrangement 1 or the battery arrangement 2 has a fastening unit 6 which is designed to arrange the heat-conducting medium 3 on the heat source 4 via the first coupling surface 16 or to align it relative to the heat source 4 .
  • the fastening unit 6 is also designed to arrange the heat-conducting medium 3 on the heat sink 5 via the second coupling surface 17 or to align it relative to the heat sink 5 .
  • the fastening unit has at least one elastic element 7, in this case a multiplicity of elastic elements 7 in each case.
  • the elastic elements 7 are designed to exert a respective force on the thermally conductive medium 3 .
  • a respective elastic element 7 is designed to exert the respective force on the first coupling surface 16 and/or the second coupling surface 17 .
  • the elastic elements are each designed to press the thermally conductive medium 3 in the area of the first coupling surface 16 with the force or a contact force on or against the heat source 4 and/or to press the thermally conductive medium 3 in the area of the second coupling surface 17 with the force or contact force to press the heat sink 5 or against the heat sink 5.
  • the respective elastic elements 7 are designed either to thermally couple the heat-conducting medium 3 to the heat source 4 or to the heat sink 5 .
  • the plurality of elastic elements 7 is thus divided into a first subset 10 and a second subset 11 .
  • the elastic elements 7 of the first subset 10 are designed to apply the contact pressure on the heat source 4 to the thermally conductive medium 3 in the region of the first coupling surface 16 or the first coupling surface 16 .
  • the elastic elements 7 of the second subset 11 are designed to apply the contact pressure on the heat sink 5 to the thermally conductive medium 3 in the region of the second coupling surface 17 or the second coupling surface 17 .
  • the cooling arrangement 1 has a plurality of second coupling surfaces 17 and a plurality of first coupling surfaces 16 .
  • Each of the first and second coupling surfaces 16, 17 is assigned a respective elastic element 7.
  • the multiple first coupling surfaces 16 and second coupling surfaces 17 alternate in each case.
  • a first coupling surface 16 and a second coupling surface 17 are arranged alternately along a spatial course of the heat-conducting medium 3 .
  • the first and second coupling surfaces 16, 17 can each have different sizes.
  • the first coupling surfaces 16 are each larger than the second coupling surfaces 17.
  • the alternating arrangement of the first and second coupling surfaces 16, 17 results in a course in which the thermally conductive medium 3 or the thermally conductive foil is guided back and forth between the heat source 4 and the heat sink 5.
  • the thermally conductive medium 3 runs back and forth multiple times between the heat source 4 and the heat sink 5 .
  • the surface of the thermally conductive medium 3 or the thermally conductive foil runs in particular parallel or at least essentially parallel to a surface of the heat source 4 and/or a surface of the heat sink 5.
  • the thermally conductive medium 3 is folded over in a region 14. It surrounds at least some of the elastic elements 7 from at least two sides. In other words, in some of the elastic elements 7 the thermally conductive medium borders both on a first side 12 and on a second side 13. The first side 12 and the second side 13 face away from one another.
  • the thermally conductive medium 3 is arranged, in particular, in a U-shape.
  • This U-shape relates in particular to a sectional illustration as in FIG.
  • This U-shaped design enables the elastic elements 7 to be framed.
  • the respective elastic element 7 is designed to exert the respective force on the thermally conductive medium 3 both via the first side 12 and via the second side 13 .
  • the respective elastic element 7 is designed to press the thermally conductive medium 3 against the heat source 4 via the force on the first side 12 and against the heat sink 5 via the second side 13 .
  • the battery arrangement 2 according to FIG. 2 also has a support element 8 .
  • the support element 8 is therefore necessary because the heat sink 5 does not extend over the entire area of the heat source 4 or over the entire area of the first coupling surface 16 .
  • the support element 8 thus forms an abutment for some elastic elements 7.
  • FIG. 3 shows a further exemplary embodiment of the cooling arrangement 1 or of the battery arrangement 2.
  • the heat-conducting medium is folded over in a Z-shape in an area 19.
  • the heat-conducting element 3 forms a Z-shape in the area 19 .
  • the area 19 there is a transition of the thermally conductive medium 3 from the heat source 4 to the heat sink 5 within the framework of the Z-shape.
  • no elastic elements 7 are arranged in the area of the second coupling surface 17 . In other words, all elastic elements
  • the support element 8 is arranged.
  • the support element 8 serves as an abutment for the elastic elements 7.
  • the support element 8 preferably runs parallel to a surface of the first coupling surface 16. In particular, the support element extends
  • a respective elastic element or the elastic elements 7 can be formed from foam.
  • the elastic elements 7 can be formed exclusively from foam or from foam in connection with one or more other materials.
  • the elastic element 7 receives its elasticity from the foam.
  • a suitable foam by selecting a suitable foam, a compressibility, a spring constant or a modulus of elasticity and the like can be particularly advantageously adapted to a particular application.
  • a particularly cost-effective production of the cooling arrangement is made possible by such a design of the elastic elements 7 .
  • B. the cell block by means of the heat sink 5 or temperature control plate is the use of the very good thermal conductivity properties of the graphite material of the thermally conductive foil or the thermally conductive medium 3 with an internal thermal conduction of about 300 ... 1600 W / mK (thermally conductive pastes about 1 ... 3 W/mK) and also when coupling in the heat, which despite the rel. low value of approx. 15 W/mK is also significantly better than with thermally conductive pastes (thermally conductive pastes (approx. 1 ... 3 W/mK).
  • the thermally conductive foil or the thermally conductive medium 3 is provided with the elastic elements 7 or spring elements in order to ensure thermal contact with the heat source 4 and sink 5. It is therefore not a matter of utilizing elastic properties in the thermally conductive foil or in the thermally conductive medium 3, for example by folding or compression, but by additional (external) elastic elements 7 or spring elements
  • These elastic elements 7, designed as foam strips, are in a sensible arrangement and width on the front and back of the thermally conductive foil or the thermally conductive medium 3. This arrangement ensures that when the heat source 4 and heat sink 5 are installed, the thermally conductive medium 3 can reach both elements ( Heat source 4 and heat sink 5) is pressed out. The heat flow can be absorbed, passed on and released as required by means of a suitable trimming or introduction of openings in the thermally conductive film or thermally conductive medium 3 .
  • the setting of partially different height differences (“tolerance compensation”) and good contacting of the heat source 4 and, on the other hand, the heat sink 5 can be implemented.
  • thermal contact is made over as large an area as possible at the heat transfer points (first and second coupling surfaces 16, 17) in order to be able to utilize the transfer thermal conductivity values of approximately 15 W/mK.
  • the internal heat conduction in the heat-conducting medium 3 is then not an obstacle, since it is many times greater, a factor of 20....100. This means that little material is required for the actual contacting and conduction, since the entire gap between the heat source 4 and the heat sink 5 does not have to be "massively" filled.
  • the thermally conductive medium 3 can be provided with an electrically insulating film or coating for electrical safety or be electrically insulated by a separate intermediate layer.
  • block-forming elements can optionally be used to avoid overloading/damaging the thermally conductive graphite layer of the thermally conductive medium 3;
  • a variant is the one-sided application of the elastic elements 7 or spring elements, z. B. by a bonding process, which leads to a spatially less structured component in the composite.
  • heat dissipation to heat sinks 5 that are not located over the entire area or are not located directly in the pressing force is made possible. This is done, for example, by thermal coupling of a protruding "heat-conducting rag" or by partially hiding the heat-conducting foil or the heat-conducting medium 3, e.g. B. under the elastic elements 7 or spring elements.
  • the discharge area does not necessarily have to be as large as the coupling area at the heat source 4.
  • the user receives a flat component that is easy to assemble, namely the cooling arrangement 1, for the thermal coupling with an integrated tolerance compensation capability that also varies locally.
  • the cooling arrangement 1 for the thermal coupling with an integrated tolerance compensation capability that also varies locally.
  • thermally conductive medium 3 In contrast to "solid" heat-conducting mats, e.g. B. based on silicone, the actual heat transfer medium 3 is very thin, z. 0.017mm. In the case of small gap widths with low surface tolerances, very flat thermally conductive foils are also possible as thermally conductive medium 3, see also estimates in Table 1.
  • thermal connection of heat sources 4 to a heat sink 5 without heat-conducting pastes which results in a significant weight reduction.
  • a compensation of tolerances and provision of a block-forming element to z. B. electrical contacts too avoid, enable.
  • the thermally conductive mat or the thermally conductive medium 3 is a flat element and can be inserted, ie no application of pastes etc. is necessary.
  • a traction battery or at least one battery cell as the heat source 4, it is important to pay attention to the alignment of the at least one battery cell with respect to the folding/shaping of the thermally conductive mat or the thermally conductive medium 3, if necessary, in order to achieve optimal support, ie e.g Lay the fold at an angle or across the cell orientation.
  • T able 1 Necessary gap depending on tolerance and compression Reference List

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

L'invention concerne un système de refroidissement (1) pour dissiper la chaleur provenant d'une source de chaleur (4) à un dissipateur thermique (5), ayant un milieu de conduction thermique (3) qui comporte : une première surface de couplage (16) conçue pour être couplée thermiquement à la source de chaleur (4) ; et une seconde surface de couplage (17) conçue pour un couplage thermique avec le dissipateur thermique (5), le milieu de conduction thermique (3) se présentant sous la forme d'une feuille. L'agencement de refroidissement (1) comprend en outre une unité de fixation (6) qui est conçu pour disposer le milieu de conduction thermique (3), par l'intermédiaire de la première surface de couplage (16), sur la source de chaleur (4) et/ou, par l'intermédiaire de la seconde surface de couplage (17), sur le dissipateur thermique (5). Afin de réaliser une dissipation de chaleur plus efficace au moyen d'une telle feuille de conduction thermique, l'unité de fixation (16) présente au moins un élément élastique (7), l'au moins un élément élastique (7) étant conçu pour exercer une force sur le milieu de conduction thermique (3).
PCT/EP2021/072822 2020-09-11 2021-08-17 Agencement de refroidissement et agencement de batterie ayant un élément élastique pour appliquer une force à un milieu de conduction thermique WO2022053267A1 (fr)

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DE102020005581.8 2020-09-11
DE102020005581.8A DE102020005581A1 (de) 2020-09-11 2020-09-11 Kühlanordnung sowie Batterieanordnung mit einem elastischen Element zum Beaufschlagen eines Wärmeleitmediums mit einer Kraft

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3611779A1 (fr) * 2018-08-17 2020-02-19 Volkswagen AG Système de batterie pour véhicule automobile

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Publication number Priority date Publication date Assignee Title
DE102015113187A1 (de) 2015-08-11 2017-02-16 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Batterieeinrichtung und Verfahren
DE102019211083A1 (de) 2019-07-25 2021-01-28 Audi Ag Verbindungselement für eine Fahrzeugbatterieeinrichtung, Fahrzeugbatterieeinrichtung sowie Verfahren zur Herstellung eines Verbindungselements für eine Fahrzeugbatterieeinrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3611779A1 (fr) * 2018-08-17 2020-02-19 Volkswagen AG Système de batterie pour véhicule automobile

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