AT527873A1 - Heat transfer device - Google Patents

Abstract

The invention relates to a heat transfer device (4) comprising an element body having at least one fluid channel (9), wherein the fluid channel (9) is at least partially formed by a first heat transfer element (6), wherein the first heat transfer element (6) is formed from a first composite material having a first plastic layer (13), a first conductive layer (14) and a second plastic layer (15) one above the other in the specified order, wherein the first conductive layer (14) has an electrical conductivity at 25 °C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25 °C according to ASTM E1530 of at least 0.1 W/mK, and the first composite material has on the second plastic layer (15) and connected thereto a second conductive layer (16) which has an electrical conductivity at 25 °C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25 °C according to ASTM E1530 of at least 0.1 W/mK.

Description

Furthermore, the invention relates to an accumulator with at least one storage element for storing electrical energy and at least one heat transfer

transfer device for cooling or tempering the storage element.

The use of multilayer films in accumulator coolers is already known from the prior art. For example, WO 03/071616 A2 describes an electrochemical storage unit with multiple electrochemical cells and a cooling bellows formed from a deformable, thermally conductive material, having an inlet connection and an outlet connection, and through which a heat transfer medium flows. The material used in the manufacture of the cooling bellows can be a multilayer material. A three-layer construction is described in which a metal layer is arranged between a first polymer layer and a second polymer layer. For example, a thin metal foil, such as aluminum foil, can be used to increase the water vapor permeability across

to minimize the lifespan of the cooling bladder. A heat-sealable film, such as

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attached to the metal foil.

From AT 520 018 A1, an accumulator with at least one cell for storing electrical energy and at least one cooling device for cooling or tempering the cell is known, wherein the cooling device has at least one multilayer film for forming a coolant channel. The film consists of a laminate comprising a first plastic film, a reinforcement layer connected thereto, a metal foil connected to the reinforcement layer, or a metallized further plastic film connected to the reinforcement layer.

foil.

The present invention is based on the object of improving the safety of an

to improve the accumulator.

The object of the invention is achieved with the heat transfer device mentioned at the outset, in which the first composite material has a second conductive layer on the second plastic layer and connected thereto, which has an electrical conductivity at 25 °C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25 °C according to ASTM E1530 of at least 0.1 W/mK.

The task is then solved with the accumulator mentioned at the beginning, where

in which the heat transfer device is designed according to the invention.

The advantage here is that the second conductive layer provides an improved monitoring system for the accumulator. The electrical contact between the two conductive layers makes it possible to detect damage to the heat transfer element even before the heat transfer device has a leak. For example, this allows a leakage of heat from the outside into the heat transfer device.

foreign bodies penetrating the transmission element can be detected. On the other hand,

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can be achieved via the surface of the heat transfer element.

According to one embodiment of the invention, the composite material may have a third plastic layer on top of the second conductive layer. This provides protection for the second conductive layer, allowing it to be made thinner. This not only allows the electrical resistance of the layer to be modified, but also the rigidity or flexural flexibility of the heat transfer element, allowing the heat transfer device to adapt better to the contours of a

an accumulator can be adjusted.

It is also advantageous if, according to a design variant, the third plastic layer is liquid-tight (waterproof) and/or has a water vapor permeability according to DIN 53122-1 / DIN 53122-A of maximum 200 g/m²d. Due to this third plastic layer, cracks occurring inside the heat transfer element or heat transfer device can also be detected before a leak occurs, since fluid penetrating the inner layers from the fluid channel of the heat transfer device is prevented from escaping by the third plastic layer.

can.

According to another embodiment of the invention, the first and second conductive layers may be made of a metallic material, in particular of the same metallic material. This allows, on the one hand, an improvement in the aforementioned effects regarding electrical conductivity and thermal conductivity while simultaneously allowing a thinner design of the heat transfer element. On the other hand, by using the same metallic materials, the detector

structure can be simplified.

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to a better operating temperature.

Further embodiments of the invention can provide that the first conductive layer is arranged directly on the first plastic layer, the second plastic layer is arranged directly on the first conductive layer, and the second conductive layer is arranged directly on the second plastic layer, and that, if appropriate, the third plastic layer is arranged directly on the second conductive layer. This not only allows for a simpler layer structure, but can also improve the heat transport through the heat transfer element or improve the measurement of

electrical quantities can be achieved.

To increase the performance of the heat transfer device, according to one embodiment of the invention, the element body can be provided with a second heat transfer element that is identical in design to the first heat transfer element. This makes it easier to connect the heat transfer device to multiple storage elements.

bar training.

According to a further embodiment of the invention, in order to protect the heat transfer device, it can also be provided that the element body has a protective element made of a material which has an E-modulus according to ISO 527

of at least 100 MPa.

For a better understanding of the invention, it will be explained with reference to the following

Figures explained in more detail.

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Fig. 1 shows a motor vehicle with an electric motor and an accumulator;

Fig. 2 shows an accumulator in oblique view with a heat transfer element;

Fig. 3 shows the accumulator according to Fig. 1 in an oblique view without heat transfer.

supply element;

Fig. 4 shows a section of the heat transfer element; Fig. 5 shows a section of the heat transfer element; Fig. 6 shows a section of a further embodiment of a heat

transmission element;

Fig. 7 A section of a variant of a heat exchanger

supply element.

By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or component designations, whereby the disclosures contained in the entire description can be applied analogously to identical parts with identical reference symbols or component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and these positional

information must be transferred to the new location in the event of a change in location.

Information on standards always refers to the latest version of these standards as of the filing date of the first application establishing the priority, so-

unless otherwise explicitly stated.

Fig. 1 shows a motor vehicle 1, for example a passenger car. The motor vehicle 1 has an electric motor 2 and a battery 3. Preferably,

the electric motor 2 is the sole drive of the motor vehicle 1.

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areas of application.

In Figs. 2 and 3, the accumulator 3, i.e. a rechargeable battery (secondary battery), is shown in an oblique view, wherein Fig. 2 shows the accumulator 3 with a heat transfer device 4 and Fig. 3 shows the accumulator 3 without

this heat transfer device 4 shows.

The accumulator 3 comprises several storage elements 5 or cells for storing electrical energy (hereinafter referred to as storage element 5). The storage elements 5 can be cuboid, cubic, cylindrical,

shaped, etc.

Since the basic structure of such accumulators 3 (especially for e-mobility) is known from the relevant state of the art, in order to avoid

referred to by repetitions.

As can be seen from the comparison of Figs. 2 and 3, the heat transfer device 4 is arranged on one side of the accumulator 3. However, it can also be provided that the heat transfer device 4 extends over at least two surfaces of the accumulator 1, for example, above and laterally and optionally below. Alternatively or additionally, the heat transfer device 4 can also be arranged between the storage elements 5 or only below the storage elements 5 or only in the region of the side walls.

the storage elements 5.

The heat transfer device 4 can extend over all storage elements 5 (as can be seen in Fig. 1), so that all storage elements 5 can be cooled or tempered with only one heat transfer device 4. However, it is also possible to provide several heat transfer devices 4 in the accumulator 3 for the storage elements 5, for example two

or three or four.

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the heat transfer device(s) 4.

It should be noted that the terms top, etc., refer to the installation

position of the accumulator 3.

It should also be noted that the storage elements 5 can be designed in a modular manner, so that they are also referred to as storage modules

can.

It should also be noted that in the present description, the accumulator 3 is described with several storage elements 5. However, the accumulator 3 can also have only one storage element 5. The statements in the description can therefore also be applied to this embodiment variant.

be applied.

In all embodiments, the heat transfer device 4 comprises a first heat transfer element 6 and preferably also a second heat transfer element 7 or consists of these, as can be seen from Figs. 4 and 5. The first and second heat transfer elements 6, 7 can also be combined into a single element by the first heat

transmission element 6 is bent (folded) at one edge.

The first heat transfer element 6 and the second heat transfer element 7 are preferably of identical design, so that in the following, reference is only made to the first heat transfer element 6. The explanations in this regard can be transferred to the further heat transfer element 7. However, it is possible for the second heat transfer element 7 to have a different structure, for example, more or fewer layers than the first heat transfer element 6. The materials for this layer structure of the second heat transfer element 7 can be selected for these embodiments from the materials used for the first heat transfer element 6.

described materials can be selected.

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as will be described in more detail in Fig. 7/7.

The first heat transfer element 6 is a first multi-layer foil material.

properly trained.

The multilayer foil material of the first heat transfer element 6 of the heat transfer device 4 rests against the storage elements 5, particularly directly. Since the multilayer foil material is flexible, i.e., not rigid, it can adapt to unevenness in the storage elements 5 or between the storage elements 5. A leveling compound between the heat transfer device 4 and the storage elements 5 is not required.

The heat transfer device 4 further comprises at least one fluid channel 9, which extends from at least one connection element 10 for supplying a working fluid to at least one connection element 11 for discharging the working fluid. The at least one fluid channel 9 is formed between the first and second heat transfer elements 6, 7, or between two layers of the first heat transfer element 6, or between the first heat transfer element 6 and the protective element 8, by only partially connecting the first heat transfer element 6 to the second heat transfer element 7 or the protective element 8, or the two layers of the first heat transfer element 6. For example, the at least one fluid channel 9 can be produced by gluing or welding the film materials or elements to form connecting regions 12, such as webs (see Fig. 5). The at least one fluid channel 9 is created in the unconnected regions next to the connecting regions 12. The at least one fluid channel 9 is therefore not formed by a separate component. In general, the connection techniques are preferably chosen in such a way that no additional measures have to be taken to ensure a liquid-tight design of the

to get connected.

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10, 11.

The working fluid flowing through the heat transfer device 4 is in particular a liquid, for example a water-glycol mixture, but can

also be a gas.

The first heat transfer element 6 is a composite material. In a first embodiment, it comprises, in the specified order from the inside to the outside, a first plastic layer 13, a first conductive layer

14, a second plastic layer 15 and a second conductive layer 16.

The first conductive layer 14 has an electrical conductivity at 25°C according to DIN EN 50994:2017-11 of at least 1 S/m, in particular between 1 x 10? S/m (1 x 10 exponent 2 S/m) and 1 x 10% S/m (1 x 10 exponent 8 S/m), and/or a thermal conductivity at 25°C according to ASTM E1530 of at least 0.1 W/mK, in particular between 20 W/mK and 450 W/mK. Although metallic first conductive layers 14 with correspondingly higher values for electrical conductivity or thermal conductivity are preferred, materials with low values of down to at least 1 S/m or 0.1 W/mK can also be used for thin first conductive layers 14 (see information on layer thickness below).

be set.

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However, it should be noted that the coating thickness specifications do not apply to materials with low electrical conductivity or low thermal conductivity.

ity is limited.

The second conductive layer 16 has an electrical conductivity at 25°C according to DIN EN 50994:2017-11 of at least 1 S/m, in particular between 1 x 10? S/m (1 x 10 exponent 2 S/m) and 1 x 10% S/m (1 x 10 exponent 8 S/m), and/or a thermal conductivity at 25°C according to ASTM E1530 of at least 0.1 W/mK, in particular between 20 W/mK and 450 W/mK. The same applies to the second conductive layer 16: metallic second conductive layers 14 with correspondingly higher values for electrical conductivity or thermal conductivity are preferred, but for thin first conductive layers 14 (see information on layer thickness below), materials with low values of up to

to at least 1 S/m or 0.1 W/mK.

The first plastic layer 13 is arranged directly adjacent to the at least one fluid channel 9 and delimits it, so that the working fluid that flows through the fluid channel 9 during operation of the heat transfer device 4 is in direct contact with the first plastic layer 13. The second conductive layer 16 forms the outermost layer in this embodiment, which is the furthest

test layer of the composite material removed from fluid channel 9.

According to one embodiment variant, it can be provided that the first conductive layer 14 is directly on the first plastic layer 13, the second plastic layer 15 is directly on the first conductive layer 14 and the second conductive

layer 16 is arranged directly on the second plastic layer 15.

The first conductive layer 14 can be formed by a foil or by vapor deposition of the first plastic layer 13, e.g., a PVD layer. The second conductive layer 16 can be formed by a foil or by vapor deposition of the second plastic layer 15, e.g., a PVD layer.

The first plastic layer 13 and/or the second plastic layer 15

preferably consists of at least 80% to 100% by weight of a

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thermoplastic plastic or an elastomer, i.e., a polymer. The thermoplastic plastic can be selected from a group comprising or consisting of polyethylene (PE), polyoxymethylene (POM), polyamide (PA), in particular PA 6, PA 66, PA 11, PA 12, PA 610, PA 612, polyphenylene sulfide (PPS), polyethylene terephthalate (PET), cross-linked polyolefins, preferably polypropylene (PP), and polytetrafluoroethylene (PTFE). The elastomer can be selected from a group comprising or consisting of thermoplastic elastomers such as thermoplastic vulcanizates, olefin-, amine-, or ester-based thermoplastic polyurethanes, in particular ether/ester-based thermoplastic elastomers.

Base, styrene block copolymers, silicone elastomers.

It should be mentioned at this point that a polymer in the sense of the invention is understood to be a synthetic or natural polymer which is made from corresponding

the monomers.

Preferably, the first plastic layer 13 consists of a so-called sealing film. This has the advantage that, for example, the first heat transfer element 5 can be directly bonded to the second heat transfer element 6 or the protective element 8.

can be connected to each other.

The second plastic layer 15 can in particular consist of PA or PET. It is also possible for the second plastic layer 15 to consist of several sub-layers, for example a combination of PA and PET, in which case the PET sub-layer is preferably further away from the fluid.

channel 9 is arranged as the PA sublayer.

However, it is also possible to use other plastics, such as thermosetting plastics or thermosetting materials, which are then bonded together using an adhesive. Two-component adhesive systems based on polyurethane or silicone are particularly suitable for this purpose, or

Hot melt systems.

In general, between two layers of the first heat transfer element

6 an adhesive layer may be arranged, in particular over the entire surface. For example

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the first plastic layer 13 can be connected to the first conductive layer 14 and/or the first conductive layer 14 can be connected to the second plastic layer 15 and/or the second plastic layer 15 can be connected to the second conductive layer 16

be connected via an adhesive layer (not shown).

The first conductive layer 14 and/or the second conductive layer 16 is/are preferably a metal layer(s). In particular, the first conductive layer 14 and/or the second conductive layer 15 is/are an aluminum layer or consists of the same metallic material. However, other metals can also be used, such as copper or silver or metallic alloys. The first conductive layer 14 and/or the second conductive layer 16 can also be formed from a different material, such as a conductive polymer, e.g., polymers containing graphite or carbon black, or metal particles or metal fibers, such as PE, PP, PA, PET, or polypyrrole or polyethene.

The first conductive layer 14 and/or the second conductive layer 16 can, for example, have a layer thickness between 5 μm and 100 μm. According to one embodiment, it can be provided that the second conductive layer 16 has a second layer thickness that is equal to or greater than a first layer thickness of the first conductive layer 14. Conversely, however, the first conductive layer 14 can also have a greater layer thickness than the second conductive layer 16. However, embodiments with a layer thickness of less than 5 μm are also possible, for example by vapor-depositing a metal, in particular aluminum, onto one of the plastic layers 13, 14 or depositing it using a PVD process. In this case, the first conductive layer 14 and/or the second conductive layer 16 can also have a layer thickness of only a few atomic layers (for example, between 2 and 10

atomic layers).

The second conductive layer 16 can also consist of a conductive print on the plastic layer 15. For example, the second conductive layer

16 made of a carbon paste, a varnish or a printable material

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made with conductive particles, such as metal or graphite, carbon black

be.

The first plastic layer 13 and/or the second plastic layer 15 can

can have a layer thickness between 10 µm and 200 µm.

In addition to bonding the individual layers of the first film material with adhesives, coextrusion and extrusion coating can also be used as joining options. Of course, a combination is also possible, whereby several polymers are coextruded and adhesively laminated with an extrusion-coated metal layer. In general, all known processes for producing composite films or film laminates can be used.

be applied.

The second plastic layer 16 can consist of or comprise the same polymer as the first plastic layer 13. However, the second plastic layer 16 can also consist of or comprise a different polymer. For example, the first plastic layer 13 can consist of PP and the further plastic layer 15 can consist of PA, PET, or PTFE, or these polymers can be

grasp.

It should be noted again that the first and second heat transfer elements 6, 7 can be of identical design. Thus, Fig. 5 also shows the four-layer structure of the first heat transfer element 6 for the second heat transfer element 7, with the first plastic layer 13 being arranged to delimit the fluid channel 9, in particular directly surrounding it.

and the second conductive layer 16 forms the outer layer.

The first conductive layer 14 and the second conductive layer 16 can be arranged in the first heat transfer element 6 so as to be electrically insulated from the fluid channel 9. This can be achieved most easily with the first plastic layer 13. However, other/additional layers can also be provided for this purpose in the first heat transfer element 6, so that the

first conductive layer 14 and the second conductive layer 16 in normal operation

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the heat transfer device 4 is therefore not in contact with the fluid channel 9

stand.

All layers of the first and/or second heat transfer element 6, 7 preferably have the same surface area, i.e., they are preferably the same size. Furthermore, all layers preferably extend continuously over at least 80%, in particular 90%, particularly preferably 100%, of the total area of the layer with the largest area. In other words, in particular, the two conductive layers 14, 16

no layers of individual conductor tracks.

In addition, all layers are preferably continuous over at least 80%, in particular 90%, particularly preferably 100%, of their respective

The surface facing the layer is connected to this surface with the immediately adjacent layer. Particularly preferably, the layers are fully

closely connected to each other.

The first heat transfer element 6 can, for example, have a layer structure comprising a first plastic layer 13 (e.g., made of PP) / first adhesive layer / first conductive layer 14 (e.g., made of Al) / second adhesive layer / second plastic layer 15 (e.g., made of PTFE) / third adhesive layer / second conductive layer 16 (e.g., made of Al). However, the first heat transfer element 6 can also have a layer structure comprising a first plastic layer 13 (e.g., made of PP) / first conductive layer 14 (e.g., made of Al) / second plastic layer 15 (e.g., made of PET) / second conductive layer 16 (e.g.,

made of Al). Mixed variants of these

The first conductive layer 14 and/or the second conductive layer 16 can be used for a variety of purposes. For example, they can improve the liquid-tightness of the heat transfer device 4 or increase vapor permeability. On the other hand, they can also be used for measurement methods, such as detecting a leak in the heat transfer device 4, for which the electrical resistance between the conductive layers

ten 14, 16. However, the electrical conductivity can also be used for other

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purposes, for example, to heat the working fluid. On the other hand, the thermal conductivity of the conductive layers 14, 16 can be used for heat distribution or heat transport. It is also possible to use the electrical conductivity in one of the two conductive layers 14, 16 and the thermal conductivity in the other of the two conductive layers 14, 16.

zen.

Regardless of the number of plastic layers 13, 15 in the layer structure of the first heat transfer element 6, all plastic layers 13, 15 are preferably formed from a polymer selected from the polymers mentioned above. Several or all plastic layers 13, 15

be made of the same polymer, or several or all plastic layers

13, 15 may be formed from different polymers.

This also applies to another embodiment of the heat transfer element 6, shown in detail in Fig. 6. Reference should also be made to the

refer to the above statements.

In the embodiment shown in Fig. 6, the composite material of the first heat transfer element 6 has a third plastic layer 17 arranged on the second conductive layer 16. According to one embodiment, the first heat transfer element 6 can have the layer structure of first plastic layer 13 (e.g., made of PP) / first adhesive layer / first conductive layer 14 (e.g., made of Al) / second adhesive layer / second plastic layer 15 (e.g., made of PTFE) / third adhesive layer / second conductive layer 16 (e.g., made of Al), fourth adhesive layer / third plastic layer 17 (e.g., made of PA or PET). The first heat transfer element 6 can also have a layered structure comprising a first plastic layer 13 (e.g., made of PP) / first conductive layer 14 (e.g., made of Al) / second plastic layer 15 (e.g., made of PET and/or PA) / second conductive layer 16 (e.g., made of Al) / third plastic layer 17 (e.g., made of PET), so that the layers are arranged directly on top of one another. Mixed variants of these design variants are also possible here. Likewise, the third plastic layer 17, as well as the second plastic layer 15, can consist of several sub-layers, such as

this was explained above for the second plastic layer 15.

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In this embodiment, it is also possible for the second conductive layer 16 to be printed or vapor-deposited onto the third plastic layer 17. Reference is made to the above explanations regarding the printing or vapor-depositing of the second conductive layer 16 onto the second plastic layer 17.

layer 15.

The third plastic layer 17 can consist of a polymer (= 100 wt.%) or at least 80 wt.% of this polymer, which was selected from the above-mentioned polymers for the first and second plastic layers 13, 15.

the.

The third plastic layer 17 can have a layer thickness between 10 µm and 200

to have.

All plastic layers 13, 15, 17 can have the same or different thicknesses. For example, the first plastic layer 13 can have a thickness between 40 µm and 150 µm. The second and third plastic layers 15, 17 can each have a thickness between 10 µm and 50 µm. The first plastic layer 13 can have the greatest thickness compared to the second and third plastic layers 15, 17.

sen.

According to a variant, the third plastic layer 17 can be a liquid-tight (waterproof) layer and/or have a water vapor permeability according to DIN 53122-1 / DIN 53122-A of maximum 200 g/m²d, in particular

especially between 100 g/m?d and 180 g/m*d.

As already explained above, according to a variant embodiment, which is partially shown in Fig. 7, it can be provided that the element body of the heat transfer device 4 has the protective element 8 made of a material that has an E-modulus according to ISO 527 of at least 100 MPa, in particular between 3000 MPa and 15000 MPa. The material can, for example, be a fiber-reinforced plastic, such as a glass fiber or generally (mineral-

ral)fiber-reinforced polymer, such as PP, PAG.

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The connection of the first heat transfer element 6 to the protective element 8 can, for example, be made directly with the first plastic layer 13 or via a

adhesive (for example one of those mentioned above).

The protective element 8 can have a layer thickness between 1 mm and 10 mm.

sen.

In the embodiment shown in Fig. 7, the protective element 8 forms part of the at least one fluid channel 9. However, the protective element 8 can also be arranged to cover the first or second heat transfer element 6, 7.

be.

In the event that one or more of the conductive layer(s) 14, 16 is or are applied directly to one of the plastic layers 12, 15, 17,

This can also be achieved, for example, with a printing process (e.g. screen printing, roll printing, inkjet printing, gravure printing, gravure printing, planographic printing, stamp printing), by spraying, vapor deposition, plasma coating, sputtering, powder coating, etc.

consequences.

The embodiments show or describe possible variants, whereby it should be noted that combinations of the individual

Different versions are possible.

For the sake of order, it should finally be pointed out that for a better understanding of the structure of the heat transfer device 4, this does not necessarily

gender-wise scaled.

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18

List of reference symbols

motor vehicle

electric motor

Accumulator heat transfer device

Storage elements Heat transfer element Heat transfer element Protection element

Fluid channel connection element connection element connection area plastic layer

layer

plastic layer

layer

plastic layer

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Patent claims

1. Heat transfer device (4) comprising an element body having at least one fluid channel (9), wherein the fluid channel (9) is at least partially formed by a first heat transfer element (6), wherein the first heat transfer element (6) is formed from a first composite material having, one above the other in the specified order, a first plastic layer (13), a first conductive layer (14) and a second plastic layer (15), wherein the first conductive layer (14) has an electrical conductivity at 25°C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25°C according to ASTM E1530 of at least 0.1 W/mK, characterized in that the first composite material has a second conductive layer (16) on the second plastic layer (15) and connected thereto, which second conductive layer has an electrical conductivity at 25°C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25 °C according to ASTM E1530 of

at least 0.1 W/mK.

2. Heat transfer device (4) according to claim 1, characterized in that the composite material on the second conductive layer (16)

a third plastic layer (17).

3. Heat transfer device (4) according to claim 2, characterized in that the third plastic layer (17) is liquid-tight and/or has a water vapor permeability according to DIN 53122-1 / DIN 53122-A of maximum 200

g/m?d.

4. Heat transfer device (4) according to one of claims 1 to 3, characterized in that the first and the second conductive layer (14, 16) consist of a metallic material, in particular of the same metallic material.

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5. Heat transfer device (4) according to one of claims 1 to 4, characterized in that the second conductive layer (16) has a second layer thickness which is equal to or greater than a first layer thickness of the first conductive layer (14).

6. Heat transfer device (4) according to one of claims 1 to 5, characterized in that the first conductive layer (14) is directly on the first plastic layer (13), the second plastic layer (15) is directly on the first conductive layer (14) and the second conductive layer (16) is directly

are arranged on the second plastic layer (15).

7. Heat transfer device (4) according to one of claims 2 to 5, characterized in that the first conductive layer (14) is directly on the first plastic layer (13), the second plastic layer (15) is directly on the first conductive layer (14), the second conductive layer (16) is directly on

the second plastic layer (15) and the third plastic layer (17) directly

are arranged on the second conductive layer (16).

8. Heat transfer device (4) according to one of claims 1 to 7, characterized in that the element body has a second heat transfer element (7) which is designed in the same way as the first heat transfer

support element (6).

9. Heat transfer device (4) according to one of claims 1 to 8, characterized in that the element body has a protective element (8) made of a material having an E-modulus according to ISO 527 of at least 100 MPa

has.

10. Accumulator (3) with at least one storage element (5) for storing

supply for electrical energy and at least one heat transfer device

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(4) for cooling or tempering the storage element (5), characterized in that the heat transfer device (4) according to one of the claims

1 to 9 is trained.

A2023/88585-AT

Claims (10)

Patent claims 1. Heat transfer device (4) comprising an element body having at least one fluid channel (9), wherein the fluid channel (9) is at least partially formed by a first heat transfer element (6), wherein the first heat transfer element (6) is formed from a first composite material having, one above the other in the specified order, a first plastic layer (13), a first conductive layer (14), and a second plastic layer (15), wherein the first conductive layer (14) has an electrical conductivity at 25°C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25°C according to ASTM E1530 of at least 0.1 W/mK, and wherein the first conductive layer (14) is a metal layer or a metal-deposited polymer layer or a polymer layer made of a conductive polymer, characterized in that the first composite material is applied to the second plastic layer (15) and a second conductive layer is connected thereto. (16) which is a metal layer or a metal-deposited polymer layer or a polymer layer made of a conductive polymer and which has an electrical conductivity at 25 °C according to DIN EN 50994:2017-11 of at least 1 S/m and/or a thermal conductivity at 25 °C according to ASTM E1530 of at least 0.1 W/mK has. 2. Heat transfer device (4) according to claim 1, characterized in that the composite material on the second conductive layer (16) a third plastic layer (17). 3. Heat transfer device (4) according to claim 2, characterized in that the third plastic layer (17) is liquid-tight. 4. Heat transfer device (4) according to one of claims 1 to 3, characterized in that the first and second conductive layers (14, 16) 27/29 | Most recently submitted claims made of a metallic material, in particular of the same metallic material. 5. Heat transfer device (4) according to one of claims 1 to 4, characterized in that the second conductive layer (16) has a second layer thickness which is equal to or greater than a first layer thickness of the first conductive layer (14). 6. Heat transfer device (4) according to one of claims 1 to 5, characterized in that the first conductive layer (14) is directly on the first plastic layer (13), the second plastic layer (15) is directly on the first conductive layer (14) and the second conductive layer (16) is directly are arranged on the second plastic layer (15). 7. Heat transfer device (4) according to one of claims 2 to 5, characterized in that the first conductive layer (14) is arranged directly on the first plastic layer (13), the second plastic layer (15) is arranged directly on the first conductive layer (14), the second conductive layer (16) is arranged directly on the second plastic layer (15) and the third plastic layer (17) is arranged directly on the second conductive layer (16). 8. Heat transfer device (4) according to one of claims 1 to 7, characterized in that the element body has a second heat transfer element (7) which is designed in the same way as the first heat transfer support element (6). 9. Heat transfer device (4) according to one of claims 1 to 8, characterized in that the element body has a protective element (8) made of a fiber-reinforced plastic which has an elastic modulus according to ISO 527 of at least 100 MPa. AB1L012/2025 (UZ A2023/8835835-A 1) 28/29 MOST RECENT CLAIMS 10. Accumulator (3) with at least one storage element (5) for storing electrical energy and at least one heat transfer device (4) for cooling or tempering the storage element (5), characterized in that the heat transfer device (4) is designed according to one of claims 1 to 9. AB1012/2025 (UZ A2023/8835835-A 1) 29/29 MOST RECENT CLAIMS