Heat exchanger and its enclosure

Abstract

To provide a heat exchanger in which a harmful uneven deformed part is prevented from being formed on a surface.SOLUTION: A heat exchanger comprises: an outer package body 1 in which an inlet and an outlet are provided and which includes a pair of opposed walls 111 and 151; and an inner fin 2 which is disposed between the pair of opposed walls and in which a recess 25 and a projection 26 are provided. A heat exchange medium flowing in from the inlet passes an inner fin installation part inside of the outer package body and flows out of the outlet. The outer package body 1 is constituted of an outer package laminate L1 in which a resin thermal fusion layer 52 is provided at an inner surface side of a metallic heat transfer layer 51. Regarding the heat transfer layer 51 of the outer package laminate L1, Vickers hardness ranges from 40 HV to 200 HV and extension ranges from 0.1% to 20%. A bottom face of the recess and a top face of the projection in the inner fin 2 are joined to the pair of opposed walls 111 and 151.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a heat exchanger and its outer casing, which are manufactured using a laminate material such as a laminate sheet in which a resin heat-sealing layer is laminated on a metal heat-conductive layer. [Background technology]

[0002] As electronic devices such as smartphones and personal computers become smaller and more powerful, it is becoming increasingly important to take measures to prevent heat generation around the CPU of these devices. Some models incorporate water-cooled coolers or heat pipes to reduce the thermal load on electronic components such as the CPU, and to prevent heat from building up inside the housing, thereby avoiding the adverse effects of heat.

[0003] Furthermore, battery modules installed in electric vehicles and hybrid vehicles generate a lot of heat due to repeated charging and discharging. For this reason, similar to the electronic devices mentioned above, technologies have been proposed for battery modules to incorporate water-cooled coolers and heat pipes to avoid the adverse effects of heat.

[0004] Furthermore, measures such as installing cooling plates or heat sinks have been proposed to prevent heat generation in power modules made of silicon carbide (SiC) and the like.

[0005] Conventionally, thin coolers such as heat pipes incorporated into small electronic devices have mainly been made of metal, with multiple metal components joined by brazing or the like (Patent Documents 1 to 3).

[0006] However, since each component of a metal cooler is manufactured using tedious metal processing (machining) such as plastic processing, such as casting or forging, or removal processing such as cutting, it is difficult to make it thinner than the current model. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-59693 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-141002 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-189415 Summary of the Invention [Problem to be solved by the invention]

[0008] In recent years, therefore, coolers have been proposed in which the outer casing and inner fin (inner core material) are made of laminate material. The laminate material is constructed by laminating a heat-sealed resin layer on a metal foil layer, and the heat-sealed layer of the laminate material for the outer casing is heat-sealed to the heat-sealed layer of the laminate material for the inner fin to form the cooler.

[0009] Such a cooler made of laminated material does not require troublesome metal processing, and can be manufactured more easily, at a lower cost, and thinner.

[0010] However, in heat exchangers such as coolers that use laminated materials, heat sealing is generally performed at high temperatures and high pressures to ensure that the outer casing is heat-sealed to the inner fins. This can cause harmful irregularities and deformations, such as molding, on the surface of the outer casing, which is made of laminated material, due to differences in stress between the contact area and the non-contact area with the inner core material, resulting in poor appearance and, in some cases, a reduction in the contact area with the object to be cooled, such as a battery, and thus reduced heat exchange performance.

[0011] This invention has been made in consideration of the above-mentioned problems, and aims to provide a heat exchanger and its outer casing that uses a laminated material, can prevent the occurrence of harmful uneven deformations on the surface, has a good appearance, and improves heat exchange performance. [Means for solving the problem]

[0012] In order to solve the above problems, the present invention comprises the following means.

[0013] [1] A heat exchanger comprising an outer casing having an inlet and an outlet and a pair of opposing walls, and an inner fin disposed between the pair of opposing walls and having a recess and a protrusion, wherein a heat exchange medium flowing in from the inlet passes through an inner fin installation portion in the outer casing and flows out from the outlet, The outer envelope is made of an outer laminate material having a resin heat-sealing layer on the inner side of a metal heat-transfer layer, and the heat-transfer layer of the outer laminate material has a Vickers hardness of 40HV to 200HV and an elongation of 0.1% to 20%, the inner fin is made of an inner core laminate material having a heat-sealing layer on both sides of a metal heat transfer layer, a bottom surface of the recessed portion and a top surface of the protruding portion of the inner fin are joined to the pair of opposing walls;

[0014] [2] The heat exchanger according to the preceding paragraph 1, wherein the heat transfer layer of the outer laminate material is made of aluminum foil.

[0015] [3] A heat exchanger according to the preceding paragraph 2, wherein the heat transfer layer of the outer laminate material is made of work-hardened H-material.

[0016] [4] The heat exchanger according to any one of the preceding items 1 to 3, wherein the heat transfer layer of the outer laminate material has a thickness of 30 μm to 200 μm.

[0017] [5] A heat exchanger according to any one of the preceding paragraphs 1 to 4, wherein the inner fin is wavy with concave and convex portions arranged alternately and continuously, and the bottom walls of the concave portions and the top walls of the convex portions are formed in an angular waveform that is arranged parallel to the pair of opposing walls.

[0018] [6] An outer casing of a heat exchanger having an inlet and an outlet, and a pair of opposing walls, such that a heat exchange medium flowing in from the inlet passes between the pair of opposing walls and flows out from the outlet, an inner fin having a recess and a protrusion can be disposed between the pair of opposing walls with the bottom surface of the recess and the top surface of the protrusion joined to the pair of opposing walls; The outer casing of a heat exchanger is constructed from an outer laminate material having a resin heat-sealing layer on the inner side of a metal heat transfer layer, and the heat transfer layer of the outer laminate material has a Vickers hardness of 40HV to 200HV and an elongation of 0.1% to 20%. [Effects of the Invention]

[0019] According to the heat exchanger of invention [1], the heat transfer layer of the outer casing is made of a metal foil adjusted to a predetermined elongation and hardness, so even when heat sealing is performed under harsh and strict heat sealing conditions, the sealing pressure during sealing can be distributed over the entire circumferential surface of the outer casing, preventing stress from concentrating in certain areas. This prevents harmful irregularities such as dents from forming on the outer surface of the outer casing, resulting in a good appearance and improved product value. Furthermore, sufficient contact area with the heat exchange target, such as a battery, can be secured, improving heat exchange performance.

[0020] According to the heat exchanger of the inventions [2] and [3], the above effects can be obtained more reliably and at a lower cost.

[0021] According to the heat exchanger of invention [4], even if the heat transfer layer of the outer laminate material is hard, the outer laminate material can be reliably thermoformed, good formability can be maintained, and the outer body of the desired shape can be reliably formed.

[0022] According to the heat exchanger of the fifth aspect, the pair of opposing walls of the outer case can be welded to the bottom surfaces of the recesses and the top surfaces of the protrusions of the inner fins through surface contact, which further improves the dispersion of the sealing pressure during heat sealing, more reliably prevents the above-mentioned deformation, and more reliably improves the aesthetic appearance and heat exchange performance. Furthermore, the contact area between the pair of opposing walls of the outer case and the inner fins can be sufficiently large, which improves the attachment strength of the inner fins to the outer case and more reliably prevents contact failures.

[0023] According to the heat exchanger envelope of the invention [6], it is possible to reliably manufacture a heat exchanger that has the same effects as those described above. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the present invention. [Figure 2] FIG. 2 shows a heat exchanger according to an embodiment, where FIG. 2(a) is a plan view, FIG. 2(b) is a side cross-sectional view corresponding to the cross section along line BB in FIG. 2(a), and FIG. 2(c) is a front cross-sectional view corresponding to the cross section along line CC in FIG. 2(a). [Figure 3] FIG. 3 is an exploded perspective view of the heat exchanger according to the embodiment. [Figure 4] FIG. 4 is a front cross-sectional view illustrating an outer shell and inner fins applied to the heat exchanger of the embodiment. [Figure 5] FIG. 5 shows a heat exchanger according to a first modified example of the present invention, where FIG. 5(a) is a plan view and FIG. 5(b) is a side cross-sectional view corresponding to the cross section taken along line BB in FIG. 5(a). [Figure 6] FIG. 6 is a schematic exploded front cross-sectional view of a heat exchanger according to a second modified example of the present invention. [Figure 7] FIG. 7 is a front view showing a modified example of an inner fin that can be used in the heat exchanger of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] 1 to 3 are diagrams showing a heat exchanger according to an embodiment of the present invention. In the following description, to facilitate understanding of the invention, the left-right direction in Fig. 2(a) will be referred to as the "front-rear direction," and the up-down direction in Fig. 2(b) will be referred to as the "up-down direction (thickness direction)."

[0026] As shown in Figures 1 to 3, the heat exchanger of this embodiment is used as a heat transfer panel, heat transfer tube, etc., and comprises an outer casing 1 as a casing (container), an inner fin (inner core material) 2 housed inside the outer casing 1, and a pair (both sides) of headers (joint members) 3, 3 housed within both end portions of the outer casing 1.

[0027] The outer envelope 1 is made up of a tray member 10 that is rectangular in plan view, and a cover member 15 that is also rectangular in plan view.

[0028] The tray member 10 is composed of a molded product of outer laminate material L1, and the entire middle region except for the outer peripheral edge is recessed downward using cold forming techniques such as deep drawing or extrusion molding to form a recessed portion 11 that is rectangular in plan view, and a flange portion 12 that protrudes outward is integrally formed on the outer periphery of the opening edge of the recessed portion 11.

[0029] Furthermore, the cover member 15 is formed with a pair of openings 16, 16 corresponding to the front and rear ends of the recessed portion 11 in the tray member 10. Needless to say, in this embodiment, one of the pair of openings 16 is configured as an entrance, and the other opening 16 is configured as an exit.

[0030] The tray member 10 and the cover member 15 are made of an outer laminate material L1, which is a laminate sheet having flexibility and pliability.

[0031] 4, the outer laminate material L1 includes a heat-transfer layer 51 made of metal (metal foil), a heat-sealing layer 52 made of a heat-sealing resin film or a heat-sealing resin sheet laminated via an adhesive on one surface (inner surface) of the heat-transfer layer 51, and a protective layer 53 made of a heat-resistant resin film or a heat-resistant resin sheet laminated via an adhesive on the other surface (outer surface) of the heat-transfer layer 51. In this embodiment, the term "foil" is used to include a film, a thin plate, and a sheet.

[0032] The heat transfer layer 51 in the outer laminate material L1 can be made of aluminum foil, copper foil, stainless steel foil, nickel foil, nickel-plated copper foil, clad metal made of nickel and copper foil, etc., but aluminum foil and copper foil are preferred, and it is particularly preferred to use H material (hard material) made of work-hardened aluminum with the temper classification "H" as defined in JIS H0001. In this embodiment, the terms "copper," "aluminum," "nickel," and "titanium" are used to mean alloys thereof.

[0033] The thickness of the heat transfer layer 51 is preferably set to 30 μm to 300 μm, and more preferably 40 μm to 200 μm. In this embodiment, the symbol "to" in the range of 30 μm to 300 μm includes a lower limit such as 30 μm and an upper limit such as 300 μm.

[0034] Furthermore, in this embodiment, the heat transfer layer 51 must have a Vickers hardness of 40HV to 200HV in accordance with JIS Z 2244. If the Vickers hardness is too hard, exceeding 200HV, it is undesirable because it reduces handleability and moldability, reducing processability. Conversely, if the Vickers hardness is insufficient, less than 40HV, it may be difficult to reliably prevent the formation of harmful irregularities and deformations on the surface of the outer envelope 1, as described below, which is undesirable.

[0035] Furthermore, in this embodiment, the heat transfer layer 51 must have an elongation of 0.1% to 20% in accordance with JIS K 7127. If the elongation is less than 0.1%, the material will be too hard, which will result in poor handling and molding processability, and reduced processability, which is undesirable. Conversely, if the elongation exceeds 20%, the hardness will be insufficient, which may make it difficult to reliably prevent the formation of harmful uneven deformations on the surface of the outer envelope 1 due to stress, as described below, which is undesirable.

[0036] Furthermore, when the heat transfer layer 51 is formed by laminating a resin film as the heat fusion layer 52 or the protective layer 53 with a two-component curing adhesive as the adhesive layer, it is preferable to perform cleaning, degreasing, and chemical conversion treatment on the aluminum foil or the like as the heat transfer layer 51 in advance, as this can provide corrosion resistance and good adhesion.

[0037] A film or sheet made of a polyolefin resin such as polyethylene or polypropylene, or a modified resin thereof, a fluorine-based resin, a polyester resin, or a vinyl chloride resin can be suitably used as the heat-sealing layer 52. Among these, it is particularly preferable to use a film or sheet made of non-oriented polypropylene (CPP) or linear low-density polyethylene (LLDPE).

[0038] The thermal adhesive layer 52 preferably has a thickness of 20 μm to 5000 μm, more preferably 30 μm to 80 μm.

[0039] The protective layer 53 can be preferably a film or sheet made of a heat-resistant resin such as polyester resin (PET) or polyamide resin (ONY).

[0040] Furthermore, it is preferable that the protective layer 53 has a thickness of 6 μm to 100 μm.

[0041] In addition, as an adhesive for bonding the heat transfer layer 51, the heat fusion layer 52 and the protective layer 53 that constitute the outer laminate material L1, a urethane-based adhesive, an epoxy-based adhesive, an olefin-based adhesive, etc. with a thickness of 1 μm to 5 μm can be suitably used.

[0042] In this embodiment, a three-layer sheet is used as the laminate material L1 constituting the outer envelope 1, but this is not limited thereto, and a sheet having a four or more layer structure may also be used in the present invention. For example, a sheet having a four or more layer structure may be employed by interposing another layer between the protective layer and the heat transfer layer, or by interposing another layer between the heat transfer layer and the heat-sealing layer.

[0043] In the present invention, the laminate material L1 constituting the tray member 10 and the laminate material L1 constituting the cover member 15 do not necessarily have to have the same properties, and materials with different properties may be used.

[0044] The outer envelope laminate material L1 having the above-described configuration constitutes the tray member 10 and cover member 15 of the outer envelope 1. Then, as will be described in detail later, the cover member 15 is attached to the tray member 10 so as to close the opening of the recessed portion 11, thereby forming the outer envelope 1.

[0045] In this embodiment, a pair of opposing walls is formed by the bottom wall (lower wall) 111 of the recessed portion 11 in the tray member 10 and the top wall (upper wall) 151 of the portion corresponding to the recessed portion 11 in the cover member 15 attached to the tray member 10.

[0046] As shown in FIGS. 1 to 4, the inner fin 2 housed in the hollow portion (recessed portion) 11 of the outer envelope 1 is made of an inner core laminate material L2, which is a laminate sheet having flexibility or pliability.

[0047] As shown in FIG. 4, the inner core laminate material L2 includes a heat transfer layer 61 made of metal foil, and heat-sealing layers 62, 62 made of resin film or resin sheet laminated on both sides of the heat transfer layer 61 via an adhesive.

[0048] The heat transfer layer 61 in the inner core laminate material L2 can be made of aluminum foil, copper foil, stainless steel foil, nickel foil, nickel-plated copper foil, clad metal made of nickel and copper foil, etc., but it is particularly preferable to use softened aluminum O material (soft material) with a temper classification of ``O''.

[0049] The thickness of the heat transfer layer 61 is preferably set to 30 μm to 300 μm, and more preferably set to 40 μm to 200 μm.

[0050] The heat-sealing layer 62 may preferably have the same structure as the heat-sealing layer 52 of the outer laminate material L1.

[0051] Furthermore, as the adhesive for bonding the heat transfer layer 61 and the heat fusion layer 62 that constitute the inner core laminate L2, an adhesive having the same structure as the adhesive for the outer cover laminate L1 can be suitably used.

[0052] In this embodiment, a three-layered sheet is used as the laminate material L2 constituting the inner fin 2, but this is not limited thereto, and a four-layered or more sheet may be used in the present invention, similar to the outer laminate material L1. For example, a four-layered or more sheet may be used by interposing another layer between the thermal fusion layer and the heat transfer layer.

[0053] The inner fins 2 can be processed by cutting, injection molding, sheet forming (vacuum forming, pressure forming, etc.), corrugating, embossing, etc. Needless to say, the processing method for the inner fins 2 is not limited.

[0054] 2 to 4, the inner fin 2 is formed in a rectangular wave shape (a digital signal waveform) in which the recesses 25 and protrusions 26 are alternately and continuously formed. That is, the bottom surfaces (bottom walls) of the recesses and the top surfaces (top walls) of the protrusions in the inner fin 2 of this embodiment are formed flat and are arranged parallel to the bottom wall (lower wall) 111 of the tray member 10 and the top wall (upper wall) 151 of the cover member 15 when assembled into the heat exchanger. Furthermore, the inner fin 2 has rising walls connecting adjacent recess bottom walls and protrusion top walls arranged perpendicular to the recess bottom walls and protrusion top walls, or to the top and bottom walls 111, 151 of the outer casing 1 when assembled into the heat exchanger.

[0055] The inner fins 2 are housed in the recessed portions 11 of the tray member 10. In this case, the inner fins 2 are housed in the middle portion of the recessed portion 11 of the tray member 10, excluding both the front and rear ends. Furthermore, the inner fins 2 are arranged so that the direction of their peaks and valleys coincides with the front-rear direction of the tray member 10 (the left-right direction in FIG. 1). As a result, the tunnels and grooves formed by the peaks and valleys of the inner fins 2 form heat exchange flow paths. These heat exchange flow paths are arranged along the front-rear direction (length direction) of the tray member 10, and multiple paths are arranged in parallel in the width direction (left-right direction). The heat exchange medium (heat medium) is configured to flow smoothly from one front-rear end to the other end of the outer envelope 1 while being evenly dispersed through each heat exchange flow path.

[0056] On the other hand, as shown in FIGS. 2 and 3, a pair of headers 3, 3 disposed at both ends of the outer envelope 1 are made of molded synthetic resin.

[0057] The resin constituting the header 3 is preferably the same type of resin as the resin constituting the heat-sealing layers 52, 62 of the outer shell 1 and the inner fin 2. Specifically, polyolefin resins such as polyethylene and polypropylene, or modified resins thereof, fluorine-based resins, polyester-based resins, vinyl chloride resins, etc. can be suitably used.

[0058] The header 3 includes a box-shaped mounting box portion 31 having an opening 32 on one side, and a pipe portion 33 provided on the upper wall of the mounting box portion 31. The pipe portion 33 is in communication with the interior of the mounting box portion 31, and is configured to allow a heat exchange medium to pass between the interior of the pipe portion 33 and the interior of the mounting box portion 31.

[0059] The mounting box portions 31 of the header 3 are disposed on both sides of the inner fins 2 in the recessed portion 11 of the tray member 10. Furthermore, the pipe portions 33 of the header 3 are disposed facing upward, and the openings 32 of the mounting box portions 31 are disposed facing inward, i.e., facing the inner fins 2.

[0060] In this way, the headers 3, 3 are housed in the tray member 10, and the cover member 15 is placed on the tray member 10 so as to close the opening. In this case, the upward pipe portions 33, 33 of the headers 3, 3 are inserted and placed inside the entrance / exit 16 of the cover member 15.

[0061] The heat exchanger assembly thus temporarily assembled is heated to heat-seal the contacting components together to form an integrated unit. In this embodiment, the heat-sealing process is carried out in two sealing steps: an outer envelope sealing step and a fin sealing step, as described below.

[0062] First, the overlapping portion of the flange 12 of the tray member 10 and the outer peripheral edge of the cover member 15 in the outer envelope 1 is heated while sandwiched between a pair of upper and lower heat seal dies (outer envelope fusion process). This heat-seals (thermally bonds) the heat-sealing layers 52 between the flange 12 of the tray member 10 and the outer peripheral edge of the cover member 15, sealing the hollow portion of the outer envelope 1 in an airtight or liquid-tight state.

[0063] Next, the middle region (lower wall 111 and upper wall 151) of the outer casing 1, whose outer periphery has been heat-sealed, is sandwiched between a pair of upper and lower heating plates and heated. As a result, the heat-sealed layers 62 on the peaks and valleys of the inner fins 2 and the heat-sealed layers 52 on the bottom wall 111 of the tray member 10 and the middle region (upper wall) 151 of the cover member 15 are bonded together by heat adhesion (thermal fusion) to form a liquid-tight or airtight seal (fin fusion process). Furthermore, in this fin fusion process, the outer peripheries of the mounting box portions 31, 31 of the headers 3, 3 are bonded together by heat adhesion (thermal bonding) to form a liquid-tight or airtight seal with the heat-sealed layers 52 on the corresponding tray member 10 and cover member 15.

[0064] The heat exchanger thus assembled is arranged so that the pipe sections 33, 33 of the headers 3, 3 protrude upward from the upper walls (cover members 15) at both ends of the envelope 1.

[0065] Here, if the heat-sealed portions between the inner fin 2 and the headers 3, 3 and the outer envelope 1 are made of the same type of resin, they can be reliably fixed together with sufficient attachment strength.

[0066] In this embodiment, by performing the heat fusion treatment (heat treatment) under reduced pressure, strong heat bonding can be achieved with high 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 headers 3, 3 that are in contact with them, and the bonding area can be widened. Therefore, it is preferable to perform the heat fusion treatment under reduced pressure.

[0067] In this embodiment, the heating temperature (welding temperature) during the heat fusion treatment is preferably set to 140°C to 250°C, and more preferably 160°C to 200°C. Furthermore, the pressure during heat fusion (welding pressure) is preferably set to 0.1MPa to 0.5MPa, and more preferably 0.15MPa to 0.4MPa. Furthermore, the fusion time (welding time) is preferably set to 2 seconds to 10 seconds, and more preferably 3 seconds to 7 seconds.

[0068] In addition, in this embodiment, the outer envelope fusion process, which heat-seals the flange portion 12 of the tray member 10 to the outer peripheral edge portion of the cover member 15, and the fin fusion process, which heat-seals the inner fin 2 and headers 3, 3 to the outer envelope 1, are performed by separate heat treatments (two-stage sealing), but this is not limited to this, and in the present invention, the outer envelope fusion process and the fin fusion process may be performed simultaneously by the same heat treatment.

[0069] In addition, in this embodiment, during the fusion process, particularly the fin fusion process, a heat-conductive rubber layer is placed on the contact surface between the outer envelope 1 and a pair of heating plates that sandwich the lower wall 111 and upper wall 151 of the outer envelope 1, thereby ensuring contact between the lower wall 111 and upper wall 151 of the outer envelope 1 and the bottom surface of the recess and the top surface of the protrusion of the inner fin 2, and enabling the heat fusion process to be performed with high precision.

[0070] The heat exchanger configured as described above is used as a cooler (cooling device) for cooling a battery or other object to be cooled (a heat exchange object). An inlet pipe for introducing a coolant (cooling water, antifreeze, etc.) as a heat exchange medium (refrigerant) is connected to one pipe section 33 of the heat exchanger, and an outlet pipe for discharging the coolant is connected to the other pipe section 33. Furthermore, a battery as an object to be cooled is placed in contact with the lower wall 111 and / or the upper wall 151 of the outer casing 1 of the heat exchanger. Then, the coolant flows from one pipe section 33 into the outer casing 1 through one header 3, flows through the inner fin 2, and then flows out of the other pipe section 33 through the other header 3. By circulating the coolant through the outer casing 1 in this way, heat is exchanged between the coolant and the battery via the inner fin 2 and the upper and lower walls of the outer casing 1, thereby cooling the battery.

[0071] The heat exchanger of this embodiment is not particularly limited in its usage form, and can be used alone or in combination of two or more. When using one, as described above, the heat exchange target member is brought into contact with the upper and lower surfaces of the heat exchanger. When using two, for example, the two heat exchangers can be arranged to sandwich the heat exchange target member. Furthermore, when using two or more, the heat exchangers and the heat exchange target member can be arranged so that they are alternately stacked.

[0072] As described above, in the heat exchanger of this embodiment, aluminum foil adjusted to a predetermined elongation and hardness is used as the heat transfer layer 51 of the outer case 1. Therefore, even if heat sealing is performed under harsh and strict heat sealing conditions in the outer case fusing step and the fin fusing step, the sealing pressure during the process can be distributed over the entire circumferential surface of the outer case 1, preventing localized concentration of stress. This prevents harmful uneven deformations such as molding on the outer surface of the outer case 1, resulting in a good appearance and improved product value. Furthermore, a sufficient contact area with the object to be cooled, such as a battery, can be ensured, improving heat exchange performance.

[0073] For reference, in order to reliably achieve heat sealing between the outer casing 1 and the inner fin 2, it is preferable to perform the heat sealing process for several seconds at a sealing temperature that is 20 to 40°C higher than the melting point of the resin that makes up the heat sealing layers 52, 62, and at a pressure that is 2 to 5 times atmospheric pressure.However, even when heat sealing is performed under such harsh heat sealing conditions, as mentioned above, it is possible to reliably prevent molding, and to reliably achieve improved aesthetics and improved heat exchange performance.

[0074] In addition, in this embodiment, if lightweight, highly thermally conductive aluminum foil is used as the heat transfer layers 51, 61 of the outer casing 1 and the inner fin 2, the laminate materials L1, L2 can be made thinner, and therefore the heat exchanger itself can be made thinner, smaller, and lighter, which is also advantageous in terms of cost.

[0075] Furthermore, when H-type aluminum foil (hard foil) is used as the heat transfer layer 51 of the outer cover 1, the dispersion of sealing pressure during heat sealing can be more reliably improved, the above-mentioned anti-shape effect can be more reliably obtained, and the aesthetics and heat exchange performance can be further improved.

[0076] In addition, in this embodiment, although the heat transfer layer 51 of the outer laminate material L1 is hard, if the thickness of the heat transfer layer 51 is adjusted to 30 μm to 200 μm, the outer laminate material L1 can be reliably thermoformed, good formability can be maintained, and the outer envelope body 1 of the desired shape can be reliably formed.

[0077] Furthermore, in this embodiment, the inner fins 2 have a corrugated shape, so that the bottom wall 111 and top wall 151 of the outer envelope 1 can be welded by surface contact with the valley bottoms and crests of the inner fins 2. This further improves the dispersion of sealing pressure during heat sealing, and more reliably prevents the above-mentioned deformation, further improving aesthetics and heat exchange performance.

[0078] Furthermore, by adopting an inner fin 2 with a rectangular wave shape, a sufficiently large contact area between the outer case 1 and the inner fin 2 can be ensured, improving the attachment strength of the inner fin 2 to the outer case 1 and more reliably preventing poor contact and the like.

[0079] Furthermore, because the inner fins 2 are formed in an angular waveform, multiple rising walls connecting the bottom wall of the recessed portion and the top wall of the protruding portion are arranged perpendicular to the opposing upper and lower walls 111, 151 of the outer envelope 1. This allows the inner fins 2 to fully function as reinforcing members, acting as tension against compressive stress due to external pressure and as tension against expansive stress due to internal pressure. This ensures high strength against both internal and external pressure, prevents deformation, reliably maintains a stable shape, and further improves operational reliability. Particularly when multiple heat exchangers are stacked, sufficient pressure resistance is ensured, ensuring a stable configuration (shape), and ensuring high heat exchange performance. Furthermore, sufficient pressure resistance eliminates the need for additional reinforcing members, thereby reducing the number of parts required and simplifying the structure and reducing costs.

[0080] In addition, in the heat exchanger of this embodiment, the position of the inner fins 2 can be regulated by the headers 3, 3, so the inner fins 2 do not sway or flap due to the flow of the heat exchange medium, and this movement can prevent the heat exchange medium from stagnating, which improves the fluidity of the heat exchange medium and further improves the heat exchange performance.

[0081] Furthermore, the heat exchanger of this embodiment, whose constituent members, the tray member 10, cover member 15, inner fin 2, and header 3, are made of synthetic resin, can be easily manufactured by simply heat fusing the constituent members together as appropriate. Therefore, the heat exchanger of this embodiment can reduce costs and improve productivity compared to conventional metal heat exchangers that are manufactured using difficult and tedious joining processes such as brazing.

[0082] Furthermore, the heat exchanger of this embodiment can further improve production efficiency and reduce costs, unlike when using metal processing such as metal plastic processing or cutting, which is troublesome and has restrictions.

[0083] Furthermore, since the heat exchanger of this embodiment is formed by bonding together the tray member 10 and the cover member 15, which are made of a thin laminate sheet (laminate material) L1, it is possible to reliably achieve a sufficiently thin and lightweight structure.

[0084] Furthermore, since the heat exchanger of this embodiment has an outer casing 1 made of laminate material L1, the shape and size of the heat exchanger itself can be easily changed, and as mentioned above, the thickness, strength, heat exchange performance, etc. can also be easily changed, so the heat exchanger can be easily finished into an appropriate configuration to suit the installation position, etc., thereby increasing design freedom and improving versatility.

[0085] FIG. 5 shows a heat exchanger according to a first modified example of the present invention, in which FIG. 5(a) is a plan view and FIG. 5(b) is a side cross-sectional view.

[0086] As shown in Figure 5, the heat exchanger of this first modified example comprises a bag-shaped outer cover 1 and inner fins 2 placed inside the outer cover 1, and has inlets and outlets 16, 16 at the front and rear ends of the outer cover 1.

[0087] The outer envelope 1 is composed of a pair (two) rectangular sheet-like outer envelope base materials, called outer envelope laminate materials L1. These two outer envelope laminate materials L1 are stacked one on top of the other with an inner fin 2 interposed between them, and the heat-sealing layers 52 at the outer peripheries of the outer envelope laminate materials L1 are joined together by heat sealing to form the heat exchanger of this first modified example.

[0088] In this first variant, joint pipes 33 are provided at the openings 16, 16 of the outer case 1. These joint pipes 33 are arranged so as to be sandwiched between the front and rear ends of the two outer case laminate materials 1a that make up the outer case 1, and the outer surfaces (thermal seal layers) of the joint pipes 33, 33 are integrally joined by thermal fusion to the thermal seal layer 52 of the corresponding outer case laminate material L1. In this way, the joint pipes 33, 33 are fixed to the outer case 1 at the openings 16, 16 of the outer case 1, passing through the front and rear ends of the outer case 1.

[0089] In the heat exchanger of this first modified example, the laminate material L1 constituting the outer shell 1 and the inner core laminate material L2 constituting the inner fin 2 are made of substantially the same material as the laminate materials L1 and L2 in the embodiment shown in Figures 1 to 4, and the inner fin 2 of the first modified example is formed in a square wave shape as in the above embodiment. Furthermore, the joint pipe 33 of the first modified example is made of the same material as the header 3 of the above embodiment.

[0090] In the heat exchanger of the first modified example, a pair of opposing middle regions of a pair of outer laminate materials L1, in other words, the regions where the inner fins 2 are provided, form a pair of opposing walls 1a, 1a.

[0091] In this heat exchanger, a heat exchange medium such as a coolant flows into the outer casing 1 through one joint pipe 33 and flows out through the other joint pipe 33, thereby circulating the coolant within the outer casing 1 and performing heat exchange between the circulating coolant and the heat exchange target material in contact with the outer surface of the outer casing 1, thereby cooling the heat exchange target material.

[0092] The heat exchanger of this modified example can also achieve the same effects as the heat exchanger of the above embodiment. Fig. 6 is an exploded front cross-sectional view showing a heat exchanger according to a second modified example of the present invention. As shown in Fig. 6, in the heat exchanger according to the second embodiment, the cover member 15 has an entire middle region corresponding to the recessed portion 11 of the tray member 10 bulged upward to form a bulged portion 18 that is rectangular in plan view, and a flange portion 17 that protrudes outward is formed around the opening edge of the bulged portion 18. In this second modified example, the cover member 15 has an inverted shape of the tray member 10, and the tray member 10 and the cover member 15 have substantially the same shape. Furthermore, the depth of the recessed portion 11 of the tray member 10 and the height (internal height) of the bulged portion 18 of the cover member 15 are set to half the height Hf of the inner fins 2.

[0093] In this heat exchanger, the flange portions 12, 17 of the tray member 10 and the cover member 15 are heat-sealed to be joined together, and further the bottom wall 111 of the tray member 10 and the bottom wall of the recess of the inner fin 2 are heat-sealed to be joined together, and the upper wall 151 of the bulge portion of the cover member 15 and the top wall of the convex portion of the inner fin 2 are heat-sealed to be joined together.

[0094] In the heat exchanger of the second modified example, the bottom wall 111 of the tray member 10 and the upper wall 151 of the bulging portion of the cover member 15 constitute a pair of opposing walls.

[0095] Other configurations of this second modified example are substantially the same as those of the first embodiment. For example, although not shown, a header is housed between the recessed portion 11 of the tray member 10 and the bulged portion 18 of the cover member 15, and the pipe portion of the header is arranged outside through an opening in the cover member 10.

[0096] The heat exchanger of this second modified example can also obtain the same effects as those of the first embodiment.

[0097] Furthermore, in this second modified example of the heat exchanger, the tray member 10 and the cover member 15 have substantially the same configuration, so that the number of components can be reduced by standardizing the components, thereby making it easier to manufacture the components and reducing costs, etc.

[0098] In this second modified example, the depth of the recessed portion 11 of the tray member 10 and the height of the bulged portion 18 of the cover member 15 are set to the same dimension, but this is not limited to this, and in the present invention, the depth of the recessed portion of the tray member 10 and the height of the bulged portion of the cover member 15 may be set to different dimensions.

[0099] In the above embodiments, an example has been described in which an inner fin 2 having a square waveform is used, but as shown in Fig. 7, an inner fin 2 having a general waveform (sine wave) in which arc-shaped recesses 25 and protrusions 26 are alternately and continuously formed, i.e., an analog signal waveform, may also be used. However, in the present invention, any inner fin can be used as long as it has recesses and protrusions that are bonded to the inner circumferential surface of the outer envelope. [Example]

[0100] [Table 1]

[0101] Example 1 (1) Preparation of components In Example 1, a heat exchanger having a similar configuration to the heat exchanger (cooler) of the second modified example shown in FIG. 6 is manufactured.

[0102] As shown in Table 1, a 100 μm thick aluminum foil was prepared as the metal foil for the heat transfer layer 51 in the outer laminate material L1 of the tray member 10. The aluminum foil was made of aluminum alloy alloy number A3004 of JIS H4000 and was an H material (hard foil) with a temper classification of "H38." This aluminum foil had an elongation of 5% according to JIS K 7127 and a Vickers hardness of 77 HV according to JIS Z 2244. The "elongation" and "Vickers hardness" columns in Table 1 list the required ranges for "elongation" and "Vickers hardness" in the present invention.

[0103] A 40 μm thick linear low-density polyethylene (LLDPE) film was bonded to one side (inner side) of this aluminum foil heat transfer layer 51 via a urethane-based adhesive, and a 12 μm thick polyethylene terephthalate (PET) film was bonded to the other side (outer side) of the heat transfer layer (aluminum foil) via a urethane-based adhesive to produce an outer laminate material (laminate sheet) L1 for the tray member 10.

[0104] By deep-drawing and cutting this outer laminate material L1, a molded product (tray member 10) was produced having a recess 11 with a depth of 2 mm, a width of 65 mm, and a length of 120 mm, and a flange portion (outer peripheral edge portion) 12 with a width of 10 mm on the outer periphery of the opening edge of the recess 11.

[0105] Furthermore, an outer laminate material L1 was produced in the same manner as above, except that aluminum foil with an elongation of 6% and a Vickers hardness of 75 HV was used as the heat transfer layer 51. This outer laminate material L1 was processed in the same manner as the tray member and then inverted to produce the cover member 15. Circular inlets with a diameter of 12 mm were formed at both ends of the upper wall 151 of the bulging portion of this cover member 15.

[0106] As shown in Table 1, a 100 μm thick aluminum foil made of aluminum alloy with alloy number A8021 of JIS H4160 and of O material (soft foil) with quality classification "O" was prepared as the metal foil for the heat transfer layer 61 in the inner core laminate material L2.

[0107] An inner core laminate L2 was prepared by laminating a 40 μm thick linear low density polyethylene (LLDPE) film to both sides of this aluminum foil heat transfer layer 61 via a urethane adhesive.

[0108] This inner core laminate material L2 was corrugated and cut to produce a corrugated fin (inner fin 2) with a width of 65 mm and a length of 60 mm, having a fin height Hf (see Figure 6) of 4 mm, a gap S between recesses or a gap S between protrusions (see Figure 6) of 3 mm, and a square wave shape.

[0109] On the other hand, a header 3 (see Figures 2 and 3) was produced by injection molding a resin material made of LLDPE, in which a mounting box portion 31 measuring 4 mm in height, 65 mm in length, and 30 mm in width was integrally formed with a pipe portion 33 having an inner diameter of φ10 mm, an outer diameter of φ12 mm, and a length of 3 mm.

[0110] (2) Assembly of the heat exchanger The headers 3, 3 are housed at both ends of the recessed portion 11 of the tray member 10 with the pipe portions 33 facing upward. Furthermore, the inner fin 2 is housed between the headers 3, 3 within the recessed portion 11. In this housed state, the lower halves of the inner fin 2 and the headers 3, 3 are housed in the recessed portion 11, and the upper halves protrude upward.

[0111] Next, the cover member 15 was placed on top of the tray member 10. At this time, the inner fin 2 and the upper half of the headers 3, 3 were housed in the bulging portion 18 of the cover member 15, and the pipe portions 33, 33 of the headers 3, 3 were inserted into the above-mentioned opening and closing port of the cover member 15 so as to protrude above the upper wall 151 of the cover member 15. Furthermore, the tray member 10 and the cover member 15 were placed so that the flange portions 12, 17 of the two members overlapped each other.

[0112] In this way, a heat exchanger temporary assembly in an unbonded state was produced, and this temporary assembly was heat-sealed using the two-stage sealing method in the same manner as in the above embodiment.

[0113] That is, using upper and lower metal sealing molds (without heat-conductive rubber) that fit the shape of the temporary assembly, heat sealing (welding) was performed at 180°C x 0.3 MPa x 7 seconds in the first sealing step to heat-seal the flanges (outer peripheral edges) 12, 17 of the tray member 10 and the cover member 15. Further, heat sealing (welding) was performed at 190°C x 0.3 MPa x 7 seconds in the second sealing step to heat-seal the contact portions of the inner fins 2 and headers 3, 3 with the tray member 10 and cover 15. In this way, the heat exchanger of Example 1 was produced.

[0114] <Example 2> In Example 2, a heat exchanger having a similar configuration to the heat exchanger of the embodiment shown in FIGS. 1 to 3 was produced.

[0115] As shown in Table 1, a 120 μm thick aluminum foil made of aluminum alloy alloy number A1100 of JIS H4160 and H material (hard foil) with a temper classification of "H18" was prepared as the metal foil for the heat transfer layer 51 in the outer laminate material L1 of the tray member 10. This aluminum foil has an elongation of 15% and a Vickers hardness of 44 HV.

[0116] Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the tray member 10 was produced in the same manner as in Example 1.

[0117] This outer laminate material L1 was deep-drawn and cut to produce a tray member 10 similar to that of Example 1 except for having a recessed portion 11 with a depth of 4 mm.

[0118] Additionally, an outer laminate material L1 was produced in the same manner as above, except that an aluminum foil made of aluminum alloy H4160JIS alloy number A3003, having an elongation of 10% and a Vickers hardness of 55 HV, was used as the heat transfer layer 51. The outer laminate material L1 was cut to produce a sheet-like cover member 15 having a rectangular shape in a plan view and large enough to cover the entire upper surface of the tray member 10. Circular openings 16, 16 with a diameter of 12 mm were formed in predetermined positions of the cover member 15 (see Figure 3, etc.).

[0119] An inner core laminate material L2 was produced in the same manner as in Example 1, except that the thickness of the heat transfer layer 62 was 120 μm. Using this inner core laminate material L2, an inner fin 2 was produced in the same manner as in Example 1.

[0120] Further, a header 3 similar to that of Example 1 was prepared.

[0121] An unbonded temporary assembly was produced by accommodating the headers 3, 3 and inner fins 2 in the recessed portion 11 of the tray member 10 and arranging a cover member 15 so as to cover the entire area of ​​the tray member 10 from above. The temporary assembly was then heat-sealed using the two-stage sealing method in the same manner as in Example 1 to produce the heat exchanger of Example 2.

[0122] Example 3 As shown in Table 1, an outer laminate material L1 for the tray member 10 was prepared in the same manner as in Example 2, except that an aluminum foil with a thickness of 100 μm was used, and a tray member 10 was prepared in the same manner as in Example 2 using the outer laminate material L1.

[0123] An 80 μm thick aluminum foil made of aluminum alloy A5052 according to JIS H4000 and tempered "H38" (H material, hard foil) was prepared as the metal foil for the heat transfer layer 51 in the outer laminate material L1 of the cover member 15. This aluminum foil had an elongation of 7% and a Vickers hardness of 105 HV. Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the cover member was produced in the same manner as in Example 2, and the laminate material L1 was used to produce the cover member 15 in the same manner as in Example 2.

[0124] An inner core laminate material L2 was produced in the same manner as in Example 1, except that the thickness of the heat transfer layer 62 was 80 μm. Using this inner core laminate material L2, an inner fin 2 was produced in the same manner as in Example 1.

[0125] The heat exchanger of Example 3 was fabricated by temporarily assembling and heat-sealing these tray members 10, cover members 15, and inner fins 2 with the same header 3 as in Example 1 in the same manner as in Example 2.

[0126] Example 4 As shown in Table 1, an 80 μm thick aluminum foil of H material (hard foil) with a quality classification of "H18" was prepared as the metal foil for the heat transfer layer 51 of the outer laminate material L1 of the tray member 10. This aluminum foil has an elongation of 2% and a Vickers hardness of 94 HV.

[0127] Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the tray member 10 was produced in the same manner as in Example 1, and the tray member 10 was produced in the same manner as in Example 1 using the laminate material L1.

[0128] An 80 μm thick aluminum foil, which is an H material (hard foil) with a quality classification of "H18," was prepared as the metal foil for the heat transfer layer 51 of the outer laminate material L1 of the cover member 15. This aluminum foil has an elongation of 1% and a Vickers hardness of 95 HV.

[0129] Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the cover member 15 was produced in the same manner as in Example 1, and the cover member 15 was produced in the same manner as in Example 1 using the laminate material L1.

[0130] The heat exchanger of Example 4 was produced by provisionally assembling and heat-sealing in the same manner as in Example 1, except that the tray member 10, cover member 15, and inner fins 2 similar to those in Example 3 were used.

[0131] <Example 5> As shown in Table 1, a 60 μm thick aluminum foil made of aluminum alloy A3003 of JIS H4160 and H material (hard foil) with a temper classification of "H18" was prepared as the metal foil for the heat transfer layer 51 in the outer laminate material L1 of the tray member 10. This aluminum foil has an elongation of 10% and a Vickers hardness of 55 HV.

[0132] Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the tray member 10 was produced in the same manner as in Example 2, and the tray member 10 was produced in the same manner as in Example 2 using the laminate material L1.

[0133] An aluminum foil having a thickness of 60 μm and made of an aluminum alloy of alloy number A3004 of JIS H4160 and of H material (hard foil) with a temper classification of "H18" was prepared as the metal foil for the heat transfer layer 51 in the outer laminate material L1 of the cover member 15. This aluminum foil has an elongation of 2% and a Vickers hardness of 94 HV.

[0134] Using this aluminum foil as the heat transfer layer 51, an outer laminate material L1 for the cover member 15 was produced in the same manner as in Example 2, and the cover member 15 was produced in the same manner as in Example 2 using the laminate material L1.

[0135] An inner core laminate material L2 was produced in the same manner as in Example 2, except that the thickness of the heat transfer layer 62 was 60 μm, and the inner core laminate material L2 was used to produce an inner fin 2 in the same manner as in Example 2. A heat exchanger of Example 5 was produced by provisionally assembling and heat-sealing in the same manner as in Example 2, except that these tray member 10, cover member 15 and inner fin 2 were used.

[0136] <Comparative Example> As shown in Table 1, a 120 μm thick aluminum foil made of aluminum alloy with alloy number A8021 of JIS H4160 and of O material (soft foil) with a temper classification of "O" was prepared as the metal foil for the heat transfer layers 51 and 61 in the laminate materials L1 and L2. This aluminum foil has an elongation of 25% and a Vickers hardness of 27 HV.

[0137] Using this metal foil as heat transfer layers 51, 61, an outer laminate material L1 and an inner core laminate material L2 were prepared in the same manner as in Example 2, and the outer laminate material L1 was used to prepare a tray member 10 and a cover member 15 in the same manner as in Example 2, and the inner core laminate material L2 was used to prepare an inner fin 2 in the same manner as in Example 2.

[0138] A comparative heat exchanger was produced by provisionally assembling and heat-sealing in the same manner as in Example 2, except that the tray member 10, cover member 15 and inner fin 2 were used.

[0139] <Pressure test> In each of the heat exchangers of Examples 1 to 5 and Comparative Example 1, cooling water was introduced through one pipe section 33, circulated through the outer case 1, and discharged from the other pipe section 33. Cooling water was circulated for 5 minutes at an internal pressure of 1 MPa. Each heat exchanger was then visually inspected for peeling (locations of adhesive failure) between the outer case and the inner fin. For reference, a test was also conducted in which the internal pressure was excessively increased to 1.5 MPa.

[0140] Those that did not experience adhesive failure such as peeling or swelling up to an internal pressure of 1.5 MPa were evaluated as "Excellent (◎)", those that did not experience adhesive failure such as peeling or swelling up to an internal pressure of 1 MPa but did experience adhesive failure such as peeling or swelling at an internal pressure of less than 1.5 MPa were evaluated as "Good (○)", and those that experienced adhesive failure such as peeling or swelling at an internal pressure of less than 1 MPa were evaluated as "Poor (×)". The results are also shown in Table 1.

[0141] <Appearance test after sealing> After heat sealing, the appearance of the outer packet 1 was visually inspected, and the surface condition of the outer packet 1 was evaluated.

[0142] The outer packet 1 whose surface was flat and free of harmful irregularities or dents was rated as "○ (good)," while the outer packet 1 whose surface showed irregularities or dents over almost the entire surface was rated as "× (bad)." The results are also shown in Table 1.

[0143] <Evaluation results> As is clear from Table 1, the heat exchangers of the examples and comparative examples all performed well in terms of pressure resistance and were comparable.

[0144] On the other hand, in the appearance test after sealing, the heat exchanger of the example had no harmful uneven deformations such as molding, and the surface flatness was well maintained. Therefore, a good appearance can be obtained, and the product value can be improved. Furthermore, because the surface is flat, a sufficient contact area with the object to be cooled, such as a battery, can be secured, and it can be determined that the heat exchange performance can be reliably improved.

[0145] In contrast, the heat exchanger of the comparative example has harmful irregularities such as molding, which makes it difficult to obtain a good appearance and may reduce the product value. Furthermore, because of the harmful irregularities on the surface, there is a risk that the contact area with the object to be cooled will be reduced, which may reduce the heat exchange performance. [Industrial Applicability]

[0146] The heat exchanger of this invention can be used as a cooler (cooling device) to counter heat generation around the CPU and battery of smartphones and personal computers, around the display of LCD televisions, OLED televisions, and plasma televisions, around the power module and battery of automobiles, and as a heater (heating device) for floor heating and snow removal. [Explanation of symbols]

[0147] 1: Outer envelope 1a: A pair of opposing walls 10: Tray material 111: Bottom wall (opposite wall) 15: Cover material 151: Upper wall (opposite wall) 16: Entrance / exit 2: Inner fin 25: Recess 26: Convex 51: Heat transfer layer 52: Heat-sealing layer 61: Heat transfer layer 62: Heat-sealing layer L1: outer laminate material L2: Inner core laminate material

Claims

1. A heat exchanger comprising: an outer casing having an inlet and an outlet and a pair of opposing walls; and an inner fin disposed between the pair of opposing walls and having a recess and a protrusion, wherein a heat exchange medium flowing in from the inlet passes through an inner fin installation portion in the outer casing and flows out from the outlet, the outer envelope is formed of an outer envelope laminate material having a resin heat-sealing layer provided on the inner surface side of a metal heat-transfer layer, and the heat-transfer layer of the outer envelope laminate material has a Vickers hardness of 40 HV to 200 HV and an elongation of 0.1% to 20%, The heat transfer layer of the outer laminate material is made of aluminum H-shaped material, A protective layer made of a polyester resin or polyamide resin film or sheet is provided on the outer surface side of the heat transfer layer of the outer laminate material, the inner fin is made of an inner core laminate material having a heat-sealing layer on both sides of a metal heat transfer layer, a bottom surface of the recessed portion and a top surface of the protruding portion of the inner fin are joined to the pair of opposing walls, A heat exchanger characterized in that heat is exchanged between a heat exchange target member arranged in contact with the outer surface of the opposing wall and a heat exchange medium within the outer casing.

2. 2. The heat exchanger according to claim 1, wherein the heat transfer layer of the inner core laminate material is made of aluminum O material.

3. 3. The heat exchanger according to claim 1, wherein the heat transfer layer of the outer laminate material is made of aluminum foil.

4. 4. The heat exchanger according to claim 1, wherein the heat transfer layer of the outer laminate material has a thickness of 30 μm to 200 μm.

5. The heat exchanger according to any one of claims 1 to 4, wherein the inner fin is wavy with concave and convex portions alternately arranged in succession, and the bottom walls of the concave portions and the top walls of the convex portions are formed in an angular waveform that is arranged parallel to the pair of opposing walls.

6. An outer casing for a heat exchanger having an inlet and an outlet, and a pair of opposing walls, such that a heat exchange medium flowing in from the inlet passes between the pair of opposing walls and flows out from the outlet, an inner fin having a recess and a protrusion can be disposed between the pair of opposing walls with the bottom surface of the recess and the top surface of the protrusion joined to the pair of opposing walls; The heat transfer layer of the outer laminate material has a Vickers hardness of 40HV to 200HV and an elongation of 0.1% to 20%, and the outer laminate material has a resin heat-sealing layer on the inner surface of the metal heat transfer layer. The heat transfer layer of the outer laminate material is made of aluminum H-shaped material, A protective layer made of a polyester resin or polyamide resin film or sheet is provided on the outer surface side of the heat transfer layer of the outer laminate material, An outer casing for a heat exchanger, characterized in that heat is exchanged between a heat exchange target member arranged in contact with the outer surface of the opposing wall and a heat exchange medium inside the outer casing.

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