JP2023041767A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality heat exchanger without liquid leakage.

SOLUTION: A heat exchanger according to the present invention includes an exterior body 1, and an inner fin 2 housed in the exterior body 1 with a part of the inner fin in contact with the inner peripheral surface of the exterior body 1. The exterior body 1 is composed of a laminate material L1 in which a resin protective layer 55 and a resin sealant layer 52 are laminated in this order on the inner surface side of a metal foil layer 51, and the inner fin 2 is composed of a laminate material L2 in which a resin coating layer 62 is laminated on both sides of the metal foil layer 61. The protective layer 55 in the exterior body 1 is configured to remain in a missing portion of the sealant layer 52 to prevent the metal foil layer 51 from being exposed.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a heat exchanger manufactured using a laminate material in which a resin layer is laminated on a metal foil layer.

As electronic devices such as smartphones and personal computers become more compact and have higher performance, measures against heat generation around the CPU of electronic devices have become important. Conventionally, many techniques have been proposed for reducing heat generation and preventing heat from remaining inside the housing to avoid the adverse effects of heat.

In addition, battery modules installed in electric vehicles and hybrid vehicles generate a large amount of heat in the battery packs due to continuous high-capacity charging or discharging. For this reason, in battery modules, as in the case of the electronic devices described above, techniques have been proposed to incorporate water-cooled coolers and heat pipes to avoid the adverse effects of heat.

Furthermore, measures such as attaching a cooling plate or a heat sink to a power module made of silicon carbide (SiC) or the like have also been proposed as countermeasures against heat generation.

By the way, electronic devices such as the above-mentioned smartphones and personal computers have thin housings, and many electronic components and coolers are incorporated in the limited space in the thin housings, so the coolers themselves are also thin. will be

Conventionally, thin coolers such as heat pipes that are incorporated in small electronic devices are generally made by brazing or diffusion bonding a plurality of metal processed parts obtained by processing metals with high heat conductivity such as aluminum. (Patent Documents 1 to 3, etc.).

However, the above-mentioned conventional cooler for small electronic devices is troublesome and restrictive because each component is manufactured by plastic processing such as casting and forging, and metal processing (machining) such as removal processing such as cutting. It is severe, and there is a limit to thinning, and it is difficult to reduce the thickness beyond the current level.

In addition, the above-mentioned conventional cooler is difficult to manufacture because it needs to be manufactured using metal processing (metal-to-metal bonding) such as brazing and diffusion bonding, which are highly difficult when bonding each component. Not only that, but the production efficiency is lowered and the cost is increased.

JP 2015-59693 A Japanese Patent Application Laid-Open No. 2015-141002 JP 2016-189415 A

Under such circumstances, the applicant of the present application has been researching a technique of using a laminate material in which a resin layer is laminated on a metal foil layer as an exterior body of a heat exchanger.

However, when the laminated material is used for the exterior body of equipment such as a heat exchanger, there is a possibility that the heat exchange medium such as the cooling liquid filled inside the exterior body may leak out. This is where the development of technology that can

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanger that can be made thin, can be manufactured simply and efficiently, can reduce costs, and can reliably prevent liquid leakage. aim.

In order to solve the above problems, the present invention has the following means.

[1] An exterior body in which a heat exchange medium flows, and an inner fin that has an uneven shape and is accommodated in the exterior body in a state that a part thereof is in contact with the inner peripheral surface of the exterior body. a heat exchanger,
The exterior body is composed of a laminate material in which a resin protective layer and a resin sealant layer are laminated in this order on the inner surface side of the metal foil layer,
The inner fin is composed of a laminate material in which resin coating layers are laminated on both sides of a metal foil layer,
A heat exchanger according to claim 1, wherein the protective layer of the exterior body is configured to remain in the lacking portion of the sealant layer to prevent exposure of the metal foil layer.

[2] The heat exchanger according to the preceding item 1, wherein the protective layer of the exterior body is made of a resin having a higher melting point than the sealant layer.

[3] The heat exchanger according to [1] or [2] above, wherein the protective layer of the exterior body is composed of a resin film or sheet laminated on the metal foil layer and the sealant layer.

[4] The heat exchanger according to any one of the preceding items 1 to 3, wherein the laminate material constituting the exterior body includes a resin heat-resistant layer laminated on the outer surface side of the metal foil layer.

[5] The heat exchanger according to any one of the preceding items 1 to 4, wherein the sealant layer of the exterior body and the coating layer of the inner fins are made of the same kind of heat-sealable resin.

[6] The heater according to any one of the preceding items 1 to 5, wherein the edge of the inner fin is provided with a resin coating portion for preventing the metal foil layer from being exposed from the edge. exchanger.

[7] An extension part is formed so that the edges of the coating layers on both sides of the inner fin extend in the edge extending direction, and the edges of the metal foil layer extend to each of the coating layers on both sides. 7. The heat exchanger according to any one of the preceding items 1 to 6, which is arranged in a state of being recessed inwardly with respect to the edge of the extension.

[8] A joint member provided with a joint member having a pipe portion penetrating through a doorway provided in the exterior body, and a mounting portion connected to the pipe portion and housed inside the exterior body. 8. The heat exchanger according to any one of items 1 to 7.

[9] The heat exchanger according to the above item 9, wherein at least the skin portion of the mounting portion of the joint member is made of the same heat-sealing resin as that of the sealant layer of the exterior body.

According to the heat exchanger of the invention [1], since the protective layer is provided between the metal foil layer and the sealant layer in the laminate material for the exterior body, even if the sealant layer is lacking due to excessive heat adhesion etc. However, the protective layer remains at the missing portion to cover the metal foil layer, thereby preventing the metal foil layer from being exposed. Therefore, the metal foil layer is not inadvertently exposed to the heat exchange medium, and liquid leakage due to corrosion of the metal foil layer can be prevented. Furthermore, in the heat exchanger of the present invention, since the exterior body is manufactured using a laminate material, there is no need to use troublesome metal processing, and it is possible to manufacture efficiently and easily, thereby reducing costs, and at the same time, sufficient Thinning can also be achieved.

According to the heat exchangers of inventions [2] and [3], the above effects can be obtained more reliably.

According to the heat exchanger of invention [4], corrosion of the metal foil layer due to external factors such as condensation can also be prevented.

According to the heat exchanger of invention [5], the sealant layer of the exterior body and the coating layer of the inner fin can be thermally bonded with sufficient attachment strength.

According to the heat exchangers of Inventions [6] and [7], it is possible to prevent the edges of the metal foil layers of the inner fins from being exposed, and to avoid adverse effects of the metal foil layers of the inner fins on the exterior body. .

According to the heat exchangers of inventions [8] and [9], the heat exchange medium can smoothly flow into and out of the exterior body through the pipe portion, and the heat exchange performance can be improved. It can be thermally adhered to the peripheral surface in a stable state with sufficient mounting strength, and the sealing performance around the entrance can be further improved.

FIG. 1 is a perspective view showing a heat exchanger that is an embodiment of the invention. FIG. 2 is an exploded perspective view of the heat exchanger of the embodiment. FIG. 3 is a partially cutaway perspective view of the heat exchanger of the embodiment. FIG. 4 is a cross-sectional view showing an enlarged portion surrounded by a dashed line S1 in FIG. FIG. 5 is a cross-sectional view showing an enlarged portion surrounded by a dashed line S2 in FIG. FIG. 6 is a cutaway perspective view enlarging the vicinity of the contact portion between the edge portion of the inner fin and the bottom surface of the tray member in the heat exchanger of this embodiment. FIG. 7 is a cross-sectional view taken along line DD of FIG. 8A and 8B are diagrams showing an inner fin laminate material according to a first modification of the present invention, where FIG. 8A is a plan view and FIG. FIG. 9 is a cross-sectional view of the end portion of the inner fin laminate material of the second modification of the present invention. FIG. 10 is an enlarged cross-sectional view showing the contact portion between the inner fins and the bottom surface of the tray member in a heat exchanger that deviates from the gist of the present invention, and is a cross-sectional view of the portion corresponding to FIG. FIG. 11 is a perspective view for explaining a corroded portion of a tray member in a heat exchanger that deviates from the gist of the present invention.

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the invention, FIG. 2 is an exploded perspective view showing the heat exchanger according to the embodiment, and FIG. 3 is a partially cutaway heat exchanger according to the embodiment. is a perspective view showing the

As shown in these figures, the heat exchanger of this embodiment is used as a heat transfer panel, a heat transfer tube, or the like. (Internal fins) 2 and a pair of joint members 3, 3 housed in both end portions of the exterior body 1 are provided.

The exterior body 1 is composed of a tray member 10 having a rectangular shape in plan view and a cover member 15 having a rectangular shape in plan view.

The intermediate region of the tray member 10, excluding the outer peripheral edge, is recessed downward using a cold forming technique such as deep drawing molding or extrusion molding to form the recess 11, and the opening of the recess 11 is formed. A flange portion 12 is integrally formed around the edge so as to protrude outward.

The tray member 10 and the cover member 15 are made of a laminate material L1, which is a flexible laminate sheet.

As shown in FIG. 4, the laminate material L1 for the exterior body includes a metal foil layer 51 made of metal foil and a resin film or resin sheet laminated on one surface (inner surface) of the metal foil layer 51 via an adhesive. A protective layer 55, a sealant layer 52 made of a resin film or resin sheet laminated on one surface (inner surface) of the protective layer 55 with an adhesive interposed therebetween, and the other surface (outer surface) of the metal foil layer 51 with an adhesive interposed therebetween. and a heat-resistant layer 53 made of a resin film or resin sheet laminated together. In this embodiment, the term "foil" is used to include films, thin plates, and sheets.

As the metal foil layer 51 in the laminate material L1, 1000 series, 3000 series, 5000 series, 8000 series aluminum foil, copper foil, stainless steel foil, nickel foil, titanium foil, or the like can be suitably used. In the present embodiment, the terms "aluminum", "copper", "nickel", and "titanium" are used to include their alloys.

The metal foil layer 51 is also called a heat transfer layer or a heat collection layer, and preferably has a thickness of 8 μm to 300 μm, more preferably 100 μm or less.

By subjecting the metal foil layer 51 to a surface treatment such as a chemical conversion treatment, the metal foil layer 51 can be prevented from corroding, and its adhesion to resin can be improved, thereby further improving its durability.

The chemical conversion treatment is performed, for example, as follows. That is, the surface of the metal foil that has undergone the degreasing treatment is coated with an aqueous solution of any one of the following 1) to 3), and then dried to perform the chemical conversion treatment.

1) An aqueous solution of a mixture containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.

2) phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium (III) salts; , an aqueous solution of a mixture containing

3) phosphoric acid, at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium (III) salts; , and at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.

The chromium deposition amount (per side) of the chemical conversion film is preferably set to 0.1 mg/m ² to 50 mg/m ² , and more preferably set to 2 mg/m ² to 20 mg/m ² .

This surface treatment is the same for the metal foil layer 61 of the laminate material L2 for fins, which will be described later.

As will be described later, when the sealant layer 52 is partially broken or melted and the sealant layer 52 is missing, the protective layer 55 remains in the missing portion and is resistant to the metal foil layer 51. By maintaining the covered state, the metal foil layer 51 is prevented from being exposed, thereby preventing corrosion of the metal foil layer 51 . Therefore, it is preferable that the protective layer 55 is made of a resin having a higher strength and a higher melting point than the sealant layer 52 .

As the protective layer 55, for example, a polyethylene terephthalate resin film, a polyamide resin film, a polyethylene naphthalate resin film, a polypropylene resin film, or the like can be suitably used.

Further, as the protective layer 55, it is preferable to use a resin having a melting point higher than that of the sealant layer 52, more preferably a resin having a melting point higher than that of the sealant layer 52 by 20.degree. That is, when a resin having a high melting point is used as the protective layer 55, it is possible to prevent the protective layer 55 from melting when the heat-sealing layer 62 of the inner fin 2 is heat-sealed to the sealant layer 52 of the exterior body 1. , the metal foil layer 51 can be reliably protected.

Also, the protective layer 55 can be formed by dry lamination in which the film is formed in a dry state.

A stretched film is preferably used as the protective layer 55 . Furthermore, as the protective layer 55, it is preferable to use a material having a water vapor permeability of 50 g/(m ² ·24 h) or less according to JIS K7129.

As the protective layer 55, it is preferable to use one having a thickness of 12 μm to 50 μm.

As the sealant layer 52, a film or sheet made of polyolefin (unstretched polypropylene (CPP), polyethylene (LDPE, LLDPE)) or modified resin thereof, fluororesin, polyester resin, vinyl chloride resin, or the like is preferably used. be able to.

The sealant layer 52 preferably has a thickness of 12 μm to 50 μm.

As the heat-resistant layer 53, a film or sheet made of polyethylene terephthalate resin, polyamide resin, polyethylene naphthalate resin, polypropylene resin, or the like can be suitably used.

In this embodiment, the film or sheet as the heat-resistant layer 53 is basically adhered to the metal foil layer 51 via an adhesive. The heat-resistant layer 53 may be laminated (film-formed) by coating the metal foil layer 51 with a resin.

The heat-resistant layer 53 is for avoiding adverse effects from dew condensation on the metal foil layer 51 and corrosive components in the atmosphere. can also

Furthermore, since the heat-resistant layer 53 is in direct contact with a member to be cooled (a member to be heat-exchanged) such as a battery, the thinner one is preferable in order to improve the heat-exchange performance. Specifically, the heat-resistant layer 53 preferably has a thickness of 20 μm to 5000 μm.

As the adhesive layer for bonding between the layers of the metal foil layer 51, the protective layer 55, the sealant layer 52, and the heat-resistant layer 53 that constitute the laminate material L1 for the exterior body, a urethane-based adhesive having a thickness of 1 μm to 5 μm, Epoxy-based adhesives, olefin-based adhesives, and the like can be preferably used.

The tray member 10 and the cover member 15 of the exterior body 1 are configured by the laminate material L1 configured as described above. As will be described later, the cover member 15 is disposed so as to close the opening of the recess of the tray member 10, and the outer peripheral edge of the cover member 15 is joined and integrated with the flange portion 12 of the tray member 10, thereby forming an exterior body. 1 is formed.

In this embodiment, entrances 16, 16 are formed at both ends of the cover member 15, respectively.

As shown in FIGS. 1 to 3, the inner fins 2 accommodated in the hollow portions (recesses 11) of the exterior body 1 are made of a laminate material L2, which is a flexible laminate sheet. As shown in FIG. 4, the laminate material L2 includes a metal foil layer 61 made of a metal foil and coating layers 62, 62 made of a resin film or a resin sheet laminated on both sides of the metal foil layer 61 via an adhesive. and

The metal foil layer 61 of the laminated material L2 for the inner fin includes copper foil, aluminum foil, stainless steel foil, nickel foil, plated copper foil, and nickel/copper clad metal in which nickel foil and copper foil are clad. Those selected from among them can be preferably used.

The metal foil layer 61 preferably has a thickness of 8 μm to 300 μm, more preferably 100 μm or less.

Also, as described above, the performance of the metal foil layer 61 can be further improved by applying the same surface treatment as the metal foil layer 51 of the exterior body 1 .

As the coating layer 62, a heat-sealable film or sheet made of polyolefin (unstretched polypropylene (CPP), polyethylene (LDPE, LLDPE)), fluorine-based resin, polyester resin, vinyl chloride resin, or the like is preferably used. be able to.

As the adhesive layer for bonding between the metal foil layer 61 and the coating layers 62, which constitute the inner fin laminate material L2, a urethane-based adhesive or an epoxy-based adhesive having a thickness of 1 μm to 5 μm may be used as described above. Adhesives, olefin-based adhesives, and the like can be preferably used.

In the present embodiment, the resin layers 62, 62 on both sides of the laminate material L2 forming the inner fin 2 are formed of the same heat-sealing resin (the same heat-sealing resin) as the sealant layer 53 of the laminate material L1 forming the exterior body 1. The same applies hereinafter).

The inner fins 2 are formed by applying unevenness processing to the sheet material made of the laminate material L2 to form unevenness.

As the unevenness processing, any processing that can impart unevenness to the laminate material L2 three-dimensionally may be used. A processing method capable of imparting unevenness can be suitably used.

Corrugating is a work such as laminating material L2 that is passed between a pair of rolls on which axial grooves are formed at equal intervals in the circumferential direction, thereby forming a corrugated three-dimensional shape in one direction. It is a processing method that

Pleating is a processing method for forming folds (pleats) by alternately folding a work such as the laminate material L2 front and back.

Embossing is a processing method or the like that uses an embossing roll having an uneven pattern formed on the outer peripheral surface to impart unevenness to a work such as the laminate material L2. In the present embodiment, the uneven pattern formed on the embossing roll is not particularly limited. can be adopted.

In this embodiment, the inner fin 2 is manufactured by corrugating a sheet material made of the laminate material L2 to form a corrugated uneven shape.

The inner fins 2 are accommodated in the intermediate portion of the concave portion 11 of the tray member 10 excluding both end portions. The inner fins 2 accommodated are arranged so that the direction of the crests and valleys (horizontal direction as viewed in FIG. 2) coincides with the lengthwise direction of the tray member 10 (horizontal direction as viewed in FIG. 2). are placed in As a result, the tunnels and grooves formed along the ridges and valleys of the inner fin 2 are arranged along the length direction of the tray member 10, and heat is exchanged through the tunnels and grooves. It is configured so that the medium can flow smoothly from one longitudinal end side of the exterior body 1 to the other longitudinal end side.

As shown in FIG. 2, a pair of joint members 3, 3 arranged in both end portions of the exterior body 1 are formed by molded articles of hard synthetic resin.

The joint member 3 includes a box-shaped mounting box portion 31 having an opening 32 on one side thereof, and a pipe portion 33 provided on the upper walls of the mounting box portions 31 , 31 . The pipe portion 33 communicates with the inside of the mounting box portion 31 so that a heat exchange medium can flow between the inside of the pipe portion 33 and the inside of the mounting box portion 31 . In this embodiment, the attachment box portion 31 of the joint member 3 constitutes the attachment portion.

In this embodiment, as the material of the joint member 3, for example, polyolefin resins such as polyethylene and polypropylene, modified resins thereof, and heat-sealing resins such as fluororesins, polyester resins, and vinyl chloride resins can be suitably used. In particular, it is preferable to use a heat-sealing resin such as high-density polyethylene (HDPE). In this embodiment, at least the outer surface (skin portion) of the joint member 3 is made of the same or the same heat-sealable resin as the sealant layer 52 of the laminate material L1 forming the exterior body.

The mounting box portions 31 of the joint member 3 are arranged on both sides of the inner fins 2 in the concave portion 11 of the tray member 10 . In this case, the pipe portion 33 of the joint member 3 is arranged facing upward, and the opening portion 32 of the mounting box portion 31 is arranged facing inward, that is, facing the inner fin 2 side.

In this way, the inner fin 2 and the joint members 3, 3 are accommodated in the tray member 10, and the cover member 15 is arranged on the tray member 10 so as to close the opening thereof. In this case, the upward pipe portions 33 , 33 of the joint members 3 , 3 are inserted into the inlet 16 of the cover member 15 .

By heating the heat transfer panel P temporarily assembled in this manner under reduced pressure, the members in contact with each other are heat-sealed and integrated.

That is, the sealant layer 52 of the flange portion 12 of the tray member 10 and the sealant layer 52 of the outer peripheral portion of the cover member 15 are joined and integrated by heat bonding (heat fusion) to seal in a liquid-tight or air-tight state. Since the sealant layer 52 of the tray member 10 and the sealant layer 52 of the cover member 15 are made of the same kind of heat-sealable resin, they can be reliably fixed with sufficient mounting strength.

Further, the coating layers 62, 62 on the top and bottom portions of the inner fin 2, the bottom wall of the tray member 10, and the sealant layer 52 of the cover member 15 are joined and integrated by heat bonding (heat fusion). Here, since the coating layers 62, 62 of the inner fin 21 and the sealant layer 52 of the tray member 10 and the cover member 15 are made of the same kind of heat-sealable resin, they are securely fixed with sufficient mounting strength. be able to.

Further, the outer peripheral surfaces of the mounting box portions 31, 31 of the joint members 3, 3 and the sealant layers 52, 52 of the tray member 10 and the cover member 15 are joined and integrated by heat bonding (heat fusion). Since the joint members 3, 3 and the sealant layer 52 of the tray member 10 and the cover member 15 are made of the same kind of resin, they can be reliably fixed with sufficient mounting strength. Therefore, the peripheral portions of the pipe portions 33, 33 of the joint members 3, 3 are adhered to the peripheral portions of the inlets 16, 16 of the cover member 15 in a liquid-tight or air-tight manner, preventing liquid leakage from the inlets 16, 16. problems can be reliably prevented.

The heat exchanger thus assembled is arranged such that the pipe portions 33, 33 of the joint members 3, 3 protrude upward from the upper walls (cover members 15) at both ends of the exterior body 1. As shown in FIG.

The heat exchanger configured as described above is used as a cooler (cooling device) for cooling a battery or the like as a member to be cooled (member to be heat exchanged). That is, one pipe portion 33 of the heat exchanger is connected to an inflow pipe for inflowing a cooling liquid (cooling water, antifreeze liquid, etc.) as a heat exchange medium (refrigerant), and the other pipe portion 33 is connected to a cooling An outflow tube is connected for the outflow of liquid. Further, a battery as a member to be cooled is arranged in contact with the upper wall and the lower wall of the exterior body 1 of the heat exchanger. In this state, the cooling liquid flows into the exterior body 1 from the one pipe portion 33 through the one joint member 3, the cooling liquid flows through the inner fins 2, and the other joint member 3 is circulated. It is made to flow out from the other pipe part 33 through. By circulating the coolant through the exterior body 1 in this manner, heat is exchanged between the coolant and the battery through the inner fins 2 and the upper and lower walls of the exterior body 1, thereby cooling the battery. .

The heat exchanger of the present embodiment is characterized in that a protective layer 55 is provided between the metal foil layer 51 and the sealant layer 52 in the laminate material L1 constituting the exterior body 1. It has excellent corrosion resistance due to its characteristic configuration. The mechanism will be described in detail below.

According to research conducted by the present applicant, it has been found that the portion where the metal foil layer 51 of the exterior body 1 is likely to corrode is the portion in contact with the edge portion of the inner fin 2 . For example, the portion surrounded by the dashed-dotted line S2 in FIG. Corrosion is likely to occur in the contact portion with the edge portion of the inner fin 2, but the portion other than the edge portion of the inner fin 2 is difficult to corrode.

That is, as shown in FIG. 10, when the exterior body 1 is composed of a laminate material L3 having no protective layer, that is, a laminate material L3 in which the sealant layer 52 is adhered to the inner surface of the metal foil layer 51, the thermal fusion is performed. Even if an excessive amount of heat or pressure is applied at the time of fitting, the melted resin forming the sealant layer 52 and the coating layer 62 is extruded so as to cover the metal foil layer 51 in the portions other than the edge portion of the inner fin 2. The metal foil layer 51 is never exposed. Therefore, the metal foil layer 51 is not exposed to the cooling liquid, and corrosion in the metal foil layer 51 is prevented. Therefore, no pinholes are generated in the metal foil layer 51, and liquid leakage does not occur.

Especially in the heat exchanger of this embodiment, as shown in FIG. Since the protective layer 55 remains without being melted, the metal foil layers 51 and 61 can be more reliably prevented from being exposed, and the occurrence of corrosion and liquid leakage can be more reliably prevented.

However, it has been found that the edge portions of the inner fins 2 are likely to be corroded at the contact portions with the exterior body 1, as described above. For example, FIG. 6 is an enlarged cutaway perspective view showing the contact portion between the edge portion 21 of the inner fin 2 and the bottom surface of the concave portion of the exterior body 1 (tray member 10), and is the portion indicated by the dashed-dotted line S3 in FIG. FIG. 7 is a cross-sectional view taken along line DD of FIG. As shown in these figures, when the exterior body 1 and the inner fins 2 are thermally bonded under reduced pressure, the exterior body 1 shrinks. Since it is suppressed by the portion 21, the lower wall of the exterior body 1 is bent so that the outer side (right side in FIG. 7) of the contact point with the edge portion 21 is lifted upward as indicated by the imaginary line in FIG. transform. During this deformation, stress is concentrated at the contact point with the edge portion 21 on the lower wall of the exterior body 1, and the edge of the metal foil layer 61 of the inner fin 2 causes the melted resin (sealant layer 52) of the exterior body 1 to move. A portion (missing portion) where the sealant layer 52 is cut off is generated by being extruded. Here, if the exterior body 1 is composed of a laminate material (see laminate material L3 in FIG. 10) in which a protective layer is not provided between the sealant layer 52 and the metal foil layer 51, the sealant layer The metal foil layer 51 is exposed at the lacking portion 52, and the exposed portion is exposed to the cooling liquid in the exterior body 1, causing the metal foil layer 51 to corrode. As a result, pinholes are formed in the metal foil layer 51 due to the corrosion, resulting in liquid leakage.

For reference, when the exterior body 1 and the inner fins 2 formed of the laminate material L3 having no protective layer are heat-bonded under reduced pressure, the inner fins 2 on the bottom wall of the concave portion of the exterior body 1 are formed as shown in FIG. A corroded portion 4 was confirmed in the metal foil layer 51 of the outer package 1 at the contact portion with the edge portion 21 of the outer package 1 .

On the other hand, in the heat exchanger of the present embodiment, since the protective layer 55 with high strength and high melting point is provided between the metal foil layer 51 and the sealant layer 52 of the exterior body 1, Even if the melted sealant layer 52 of the exterior body 1 is pushed out by the edges of the metal foil layers 61 of the inner fins 2 that are thermally bonded, and a lacking portion is generated in the sealant layer 52, the lacking portion: The protective layer 55 keeps the metal foil layer 51 covered. Therefore, the corrosion of the metal foil layer 51 can be prevented, and the occurrence of pinholes and liquid leakage can be reliably prevented.

In the present embodiment, if the edge of the metal foil layer 61 is not exposed to the outside at the edge portion 21 of the inner fin 2, it may adversely affect the exterior body 1 or damage the metal foil layer 61 itself of the inner fin 2. Corrosion can be prevented. For example, as shown in FIG. 8A, as the laminate material L2 constituting the inner fin 2, the resin film for the coating layers 62, 62 on both sides is one size larger than the metal foil for the metal foil layer 61. adopt something. As a result, as shown in FIG. 8(b), the coating layers 62, 62 on both sides are extended at the edge of the laminate material L2 for the inner fin 2, and the metal foil layer extends beyond the edge of the extended portion 66. The end edge of 61 is placed inwardly. If the inner fins 2 are manufactured by processing the laminate material L2 to have unevenness, the edges of the metal foil layers 61 of the inner fins 2 are not exposed, so that adverse effects on the exterior body 1 can be avoided. .

Further, as shown in FIG. 9, as the laminate material L2 for the inner fin 2, the edge is coated with resin to form a coating portion 65, and the edge of the metal foil layer 61 is covered with the coating portion 65. Keep Even in the inner fins 2 made of the laminate material L2, since the edge of the metal foil layer 61 is not exposed, adverse effects on the exterior body 1 can be avoided.

Further, as shown in FIGS. 8A and 8B, the coating layers 62, 62 are formed at the edges of the inner fin 2 to form extensions 66, or the edges of the coating layers 62, 62 are formed as shown in FIG. When the coating portion 65 is formed in between, the coating layer extension portion 66 and the coating portion 65 function as a cushioning material for the inner surface of the exterior body 1, and when the sealant layer 52 of the exterior body 1 melts excessively In this respect, the metal foil layer 51 of the outer package 1 can be prevented from being exposed, and corrosion and pinholes can be more reliably prevented, thereby further improving durability. can be done.

As described above, according to the heat exchanger of the present embodiment, since the protective layer 55 is provided between the metal foil layer 51 and the sealant layer 52 in the laminate material L1 constituting the exterior body 1, the sealant layer 52 is missing due to excessive heat bonding or the like, the protective layer 55 remains in the missing portion to cover the metal foil layer 51, thereby preventing the metal foil layer 55 from being exposed. Therefore, the metal foil layer 55 is not inadvertently exposed to the cooling liquid, the corrosion of the metal foil layer 55 and the occurrence of pinholes can be prevented, and a high-quality heat exchanger free from defects such as liquid leakage is provided. can do.

Further, according to the heat exchanger of the present embodiment, since the exterior body 1 is manufactured using the laminate materials L1 and L2, there is no need to use troublesome metal processing, and the heat exchanger can be manufactured efficiently and easily at a low cost. In addition, since the exterior body 1 and the inner fins 2, which are the laminated materials L1 and L2, are joined together, the thickness can be sufficiently reduced.

Further, in the heat exchanger of the present embodiment, the sealant layer 52 of the exterior body 1 and the coating layer 62 of the inner fin 2 thermally bonded to the sealant layer 52 are made of the same kind of heat-sealable resin. , the layers 52 and 62 can be heat-bonded with a sufficient mounting strength, peeling can be prevented, and sufficient durability can be obtained. Furthermore, since the same material is thermally bonded, the adhesiveness is good, and excessive thermal bonding can be effectively prevented. Corrosion of 51 and 61 can be prevented.

Furthermore, in the heat exchanger of the present embodiment, since the heat-resistant layer 53 is laminated on the outer surface side of the exterior body 1, corrosion of the metal foil layer 51 due to external factors such as condensation can be more reliably prevented. Durability can be further improved.

Further, in the heat exchanger of the present embodiment, since the pipe portions 33 of the joint members 3 provided at both ends of the exterior body 1 are arranged so as to pass through the entrance/exit 16, The cooling liquid can be smoothly and stably flowed into and out of, and the cooling performance (heat exchange performance) can be improved.

Furthermore, since the attachment box portion 31 of the joint member 3 accommodated inside the exterior body 1 is made of the same kind of heat-sealing resin as the sealant layer 52 of the exterior body 1, the attachment box portion 31 can be attached to the exterior body 1. It can be heat-bonded to the inner peripheral surface with sufficient mounting strength, the sealing performance around the entrance can be further improved, and liquid leakage from the vicinity of the entrance can be reliably prevented.

In the above embodiment, the heat exchanger is used as a cooler (cooling device) by circulating a heat medium (refrigerant) for cooling inside the heat exchanger, but the present invention is not limited to this. In , the heat exchanger can be used as a heater (heating device) or a heat generator (heat generating device) by circulating a heat medium for heating (heat medium) therein.

In the above-described embodiment, the three-dimensionally molded tray member 10 and the sheet-like cover member 15 are adhered together in manufacturing the exterior body 1. However, in the present invention, the three-dimensionally molded member (Laminate material) You can stick them together. Furthermore, it is not always necessary to three-dimensionally form the constituent members of the exterior body 1 . For example, when three-dimensional molding is not performed, a bag-like exterior body made of laminated material may be manufactured by bonding two sheet-like laminated materials at their outer peripheral edges by heat-sealing or the like. .

Furthermore, in the above-described embodiment, the case where the exterior body 1 is manufactured from two sheets of laminated material has been described as an example, but the present invention is not limited to this. Alternatively, the bag-like exterior body may be manufactured by bonding the outer peripheral edge portions of the overlapping laminated materials, excluding the folded portions, by heat-sealing or the like. Further, needless to say, in the present invention, three or more laminated materials may be used to manufacture the exterior body.

In the above-described embodiment, the laminated materials L1 and L2 have a three-layer or four-layer structure. Also good. In short, it is sufficient that the protective layer 55 is provided between the metal foil layer 51 and the sealant layer 52 in the laminate material for the exterior body.

In the above-described embodiment, the case where the heat exchanger of the present invention is used as a cooler for a battery pack of an automobile or the like has been described as an example. can also be applied to For example, heat exchangers for heating battery packs for automobiles, heat for cooling power semiconductor elements (power modules) for controlling the main power of electric power driven devices such as automobile electric motors, industrial machinery, home appliances, and information terminals. Heat exchanger for cooling CPU (Central Processing Unit) of personal computer, Heat exchanger for cooling/heating storage battery for home or business use, Cooling for battery pack (battery module) of personal computer It can also be used as a heat exchanger for cooling liquid crystal televisions, organic EL televisions, plasma television displays, floor heating equipment, and snow melting equipment for roofs, passages, roads, etc. in cold regions. can.

<Example>
A heat exchanger of an example was manufactured as follows based on the heat exchanger of the above embodiment shown in FIGS.

1. Preparation of laminate material L1 (LLDPE40/adhesive/PET25/adhesive/AL120/adhesive/PET25) for exterior body 1 (1) Chromate JIS H4160 A8021 aluminum foil (thickness 120 μm) as metal foil layer It is treated and coated on both sides with a substrate (chromium coverage of 10 g/m ² per side).

(2) A PET film (thickness: 25 μm) is laminated as a heat-resistant layer 53 on one surface (outer surface) of the aluminum foil via a urethane-based adhesive (thickness: 2 μm).

(3) Laminate a biaxially stretched polyethylene terephthalate (PET) film (25 μm thick) as a protective layer 55 on the other surface (inner surface) of the aluminum foil via a urethane adhesive (2 μm thick).

(4) LLDPE (40 μm thick) as the sealant layer 52 is laminated on the other surface (inner surface) of the biaxially stretched PET film as the protective layer 55 via a urethane adhesive (2 μm thick).

2. Preparation of laminate material L2 (LLDPE40/adhesive/AL120/adhesive/LLDPE40) for fin 2 (1) Chromate treatment is performed on JIS H4160 A8021 aluminum foil (thickness 120 μm), and the base layer is coated on both sides. (The amount of chromium attached is 10 g/m ² per side).

(2) LLDPE (40 μm thick) is laminated as coating layers 62, 62 on one side and the other side of the aluminum foil via a urethane-based adhesive (2 μm thick), respectively.

3. Preparation of Joint Member 3 (HDPE) A joint member 3 made of HDPE was prepared in which a pipe portion 33 was integrally formed with a mounting box portion 31 of 100 mm long×12 mm wide×3 mm high. The pipe portion 33 has an inner diameter of φ10 mm, an outer diameter of φ12 mm, and a length of 3 mm.

4. Preparation of heat exchanger components (1) Fabrication of tray member 10 A sheet material obtained by cutting the laminate material L1 for the exterior material 1 into a length of 230 mm x a width of 160 mm is applied to Al foil (metal foil layer 51). On the other hand, the PET film (heat-resistant layer 53) side was embossed with a depth of 3 mm using a mold with a length of 169 mm and a width of 104 mm and a corner radius of 4 to form a concave portion 11 on the convex side (outside). Further, the periphery of the flange portion 12 formed on the periphery of the opening of the concave portion 11 was cut so as to have a width of 5 mm, thereby producing the tray member 10 .

(2) Fabrication of cover member 15 A sheet material obtained by cutting the laminate material L1 for the exterior body 1 into a length of 180 mm and a width of 115 mm is provided with joint members 3 and 3 at both ends in the longitudinal direction (lengthwise direction). A cover member 15 was produced by forming inlets 16, 16 for inserting the pipe portions 33, 33 of No. 3. As shown in FIG.

(3) Fabrication of the inner fin 2 A sheet material obtained by cutting the laminate material L2 for the inner fin 2 into a length of 145 mm and a width of 210 mm is folded alternately in the horizontal direction at a width of 3.5 mm (pitch) to form a corrugated sheet. By processing, a zigzag-shaped inner fin 21 with a height of each peak of 3 mm was produced.

5. Assembly and Joining of Components (1) The joint members 3, 3 are housed in both longitudinal (longitudinal) ends of the concave portion 11 of the tray member 10 with the pipe portions 33, 33 facing upward. Further, the inner fin 2 is accommodated between the two joint members 3, 3 in the concave portion 11 of the tray member 10. As shown in FIG. The openings 32, 32 of the joint members 3, 3 are directed inward so as to face the ends of the inner fins 2. As shown in FIG.

(2) The cover member 15 is placed on the flange portion 12 of the tray member 10 so as to cover the concave portion 11 of the tray member 10 from above, with the inner side (the side on which the biaxially stretched PET film as the protective layer 55 exists) facing downward. placed in At this time, the upward pipe portions 33 , 33 of the joint members 3 , 3 in the tray member 10 were inserted through the entrances 16 , 16 of the cover member 15 and arranged to protrude upward from the cover member 15 . A non-bonded temporary heat exchanger assembly was thus produced, and the flange portion 12 of the tray member 10 was set to 200° C. while the heat exchanger temporary assembly was decompressed to 200 mmHg in a chamber-type decompressor. The heat exchanger of the example was produced by sealing with a hot plate for 5 seconds and thermally adhering (heat-sealing) the respective parts. By heating under reduced pressure, heat adhesion between the tray member 10 and the cover member 15, and between the tray member 10 and the cover member 15 and the inner fins 2 and the joint members 3, 3 in contact with them is achieved. can be strongly performed.

<Comparative example>
1. Preparation of laminate material L3 (LLDPE40/adhesive/AL120/adhesive/PET25) for exterior body 1 (1) Perform chromate treatment on JIS H4160 A8021 aluminum foil (thickness 120 μm) as a metal foil layer, The formation is coated on both sides (chromium coverage of 10 g/m ² per side).

(2) A PET film (thickness: 25 μm) is laminated as a heat-resistant layer 53 on one surface (outer surface) of the aluminum foil via a urethane-based adhesive (thickness: 2 μm).

(3) Laminate LLDPE (40 μm thick) as the sealant layer 52 on the other surface (inner surface) of the aluminum foil via a urethane-based adhesive (2 μm thick).

2. A heat exchanger of a comparative example was manufactured in the same manner as in the above example, except that the laminate material L3 was used to manufacture the exterior body 1 (the tray member 10 and the cover member 15). That is, the heat exchanger of the comparative example is the same as the heat exchanger of the above-described example except that the protective layer 55 is not provided on the exterior body 1 .

<Accelerated test on corrosion resistance>
As a corrosive solution, an OY solution (corrosive solution of pH 3 containing Cl ⁻ : 195 ppm, SO ₄ ²⁻ : 60 ppm, Cu ²⁺ : 1 ppm, and Fe ³⁺ : 30 ppm) was prepared.

The above corrosive liquid was circulated in the heat exchangers of Examples and Comparative Examples so that it was introduced from one pipe portion 33 , flowed through the inside, and flowed out from the other pipe portion 33 . As the test conditions during this circulation, the temperature of the corrosive liquid was set to 60° C., the flow rate was set to 1 L/min, and the circulation time was set to 250 hours continuously.

After the test, the appearance of the heat exchangers of Examples and Comparative Examples was visually observed and evaluated. As a result, the heat exchanger of the example had no liquid leakage and no particular change in appearance. On the other hand, in the heat exchanger of the comparative example, the edge of the inner fin 2 is in contact with the bottom surface of the lower wall of the exterior body 1 (the bottom surface of the tray member 10) and the lower surface of the upper wall (the inner surface of the cover member 15). , a whitened corroded portion 4 (see FIG. 11) was confirmed.

As is clear from this test result, the heat exchangers of the examples related to the present invention are found to be excellent in corrosion resistance.

INDUSTRIAL APPLICABILITY The heat exchanger of the present invention can be suitably used as a cooler for automobile power modules and batteries, a cooler for stationary batteries, a cooler for supercomputers, and the like.

1: Exterior body 2: Inner fin 3: Joint member 33: Pipe part 51: Metal foil layer 52: Sealant layer 53: Heat resistant layer 55: Protective layer 61: Metal foil layer 62: Coating layer 63: Coating layer 65: Coating part 66: Extension L1: Laminated material for exterior body L2: Laminated material for inner fin

Claims (6)

A heat exchanger comprising: an exterior body in which a heat exchange medium flows; and inner fins having an uneven shape, the inner fins being accommodated in the exterior body in a state where a part thereof is in contact with the inner peripheral surface of the exterior body. and
The exterior body is composed of a laminate material in which a resin sealant layer is laminated on the inner surface side of the metal foil layer,
The inner fin is composed of a laminate material in which resin coating layers are laminated on both sides of a metal foil layer,
A heat exchanger, wherein edges of the inner fins are provided with a coating portion for preventing the metal foil layer from being exposed from the edges. 2. The heat exchanger according to claim 1, wherein the laminate material forming the exterior body includes a resin heat-resistant layer laminated on the outer surface side of the metal foil layer. 3. The heat exchanger according to claim 1, wherein the sealant layer of the exterior body and the coating layer of the inner fins are made of the same kind of heat-sealable resin. Extension portions are formed so that the edges of the coating layers on both sides of the inner fin extend in the edge extension direction, and the edges of the metal foil layer extend from the respective extension portions of the coating layers on both sides. 4. The heat exchanger according to any one of claims 1 to 3, wherein the heat exchanger is disposed inwardly with respect to the edge. Claims 1 to 4, further comprising a joint member having a pipe portion penetrating through a doorway provided in the exterior body, and a mounting portion connected to the pipe portion and housed inside the exterior body. The heat exchanger according to any one of . 6. The heat exchanger according to claim 5, wherein at least the skin portion of the mounting portion of the joint member is made of the same heat-sealing resin as the sealant layer of the exterior body.

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