Heat exchange device and battery pack

Abstract

To provide a heat exchange device that can suppress blockage of a heat exchange flow path through which a heat exchange medium flows, and improve cooling performance.SOLUTION: A heat exchange device according to an embodiment of the present invention includes a bag body having a heat exchange flow path therein through which a heat exchange medium flows, and a base body having therein a supply flow path connected to one end of the heat exchange flow path and supplying the heat exchange medium to the heat exchange flow path, and a recovery flow path connected to the other end of the heat exchange flow path and recovering the heat exchange medium, and the bag body has a top sheet, a back sheet opposite the top sheet, an inlet through which the heat exchange medium flows in, an outlet through which the heat exchange medium flows out, and an anti-clogging member provided on the surface of the top sheet.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heat exchange device and a battery pack. [Background technology]

[0002] 2. Description of the Related Art Conventionally, heat exchange devices are known that cool the heat generated during use of a battery mounted on an electric vehicle or the like.

[0003] For example, Patent Document 1 discloses a battery cooling device that includes a cooler arranged between the underside of a battery module and the upper surface of a bottom plate of a battery case, a partition formed inside the cooler and connecting the upper and lower wall portions of the cooler, and a plurality of straightening paths formed inside the cooler in parallel in the horizontal direction by being partitioned by the partition, for allowing the flow of coolant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-163741 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in such conventional heat exchange devices, the cooling area is the underside of the battery, so heat generation from the side of the battery cannot be suppressed, and sufficient cooling performance cannot be obtained.

[0006] In view of the above, one aspect of the present invention aims to provide a heat exchange device that can suppress blockage of a heat exchange flow path through which a heat exchange medium flows and improve cooling performance. [Means for solving the problem]

[0007] A heat exchange device according to one aspect of the present invention comprises a bag body having a heat exchange flow path therein through which a heat exchange medium flows, and a base body having therein a supply flow path connected to one end of the heat exchange flow path and supplying the heat exchange medium to the heat exchange flow path, and a recovery flow path connected to the other end of the heat exchange flow path and recovering the heat exchange medium, and the bag body has a top sheet, a back sheet opposite the top sheet, an inlet through which the heat exchange medium flows in, an outlet through which the heat exchange medium flows out, and an anti-clogging member provided on the surface of the top sheet. [Effects of the Invention]

[0008] According to a heat exchange device according to one aspect of the present invention, it is possible to suppress blockage of a heat exchange flow path through which a heat exchange medium flows, thereby improving cooling performance. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a heat exchange device according to an embodiment, viewed from one direction. [Figure 2] 1 is an exploded perspective view of a heat exchange device according to an embodiment, viewed from one direction. [Figure 3] FIG. 2 is a perspective view of the heat exchange device according to the embodiment, seen from another direction. [Figure 4] FIG. 1 is a perspective view of a pouch according to one embodiment. [Figure 5] FIG. 5 is a view showing a cross section II of FIG. 4. [Figure 6] 3 is a schematic diagram of a cross section of a top sheet of a bag according to one embodiment. FIG. [Figure 7] FIG. 5 is a cross-sectional view taken along line II-II of FIG. 4. [Figure 8] 5 is a cross-sectional view taken along line II-II in FIG. 4 in another example of the bag body. [Figure 9] FIG. 2 is a diagram illustrating the flow of a heat exchange medium in a heat exchange device according to an embodiment. [Figure 10] 5A to 5C are schematic cross-sectional views illustrating a method for manufacturing a heat exchanger according to an embodiment. [Figure 11] 1 is a perspective view of a battery pack according to an embodiment, viewed from one direction; DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. To facilitate understanding of the description, the same components are denoted by the same reference numerals in the drawings, and redundant description may be omitted. In this specification, a three-dimensional Cartesian coordinate system with three axial directions (X, Y, and Z) is used, and one of two mutually orthogonal directions in a plane parallel to the surface F1 of the base 3 is defined as the X direction, the other as the Y direction, and the direction perpendicular to the surface F1 of the base 3 is defined as the Z direction. The orientation of the heat exchanger 1 during use is not limited to the example shown in FIGS. 1 and 2.

[0011] <Heat exchange equipment> Fig. 1 is a perspective view of a heat exchange device according to an embodiment as viewed from one direction, Fig. 2 is an exploded perspective view of a heat exchange device according to an embodiment as viewed from one direction, Fig. 3 is a perspective view of a heat exchange device according to an embodiment as viewed from another direction, Fig. 4 is a perspective view of a bag according to an embodiment, and Fig. 5 is a cross-sectional view taken along line II in Fig. 4. In Fig. 4, solid and dashed arrows indicate the flow of the heat exchange medium. Fig. 5 shows a cross-section of Fig. 4 with an anti-clogging member attached to the top sheet.

[0012] As shown in FIGS. 1 to 4 , the heat exchange device 1 includes a pouch 2 having a heat exchange flow path 23 therein through which a heat exchange medium L flows, and a base 3. The base 3 includes a supply flow path 31 communicating with one end of the heat exchange flow path 23 and supplying the heat exchange medium L to the heat exchange flow path 23, and a recovery flow path 32 communicating with the other end of the heat exchange flow path 23 and recovering the heat exchange medium L. In the example shown in FIGS. 1 to 3 , a plurality of pouches 2 are attached to the base 3 in parallel and spaced apart from each other. In this case, the object to be cooled, such as a battery, can be cooled by placing it between adjacent pouches 2. In this embodiment, an example in which the heat exchange device 1 includes a plurality of pouches 2 will be described, but the present invention is not limited thereto, and the heat exchange device 1 may include a single pouch 2.

[0013] The pouch 2 has an inlet 241 through which the heat exchange medium L flows in and an outlet 251 through which the heat exchange medium L flows out. The pouch 2 may have a rectangular shape in plan view, for example.

[0014] As shown in Fig. 5, the bag body 2 may include a top sheet 21 and a back sheet 22 facing the top sheet 21. The bag body 2 may be formed by folding a single sheet, or may be formed by bonding together multiple sheets. In other words, the top sheet 21 and the top sheet 22 may be formed from a single sheet, or may each be formed from a separate sheet.

[0015] The top sheet 21 may be made of a laminated film having a first sealant layer 211 on the innermost side, and the back sheet 22 may be made of a laminated film having a second sealant layer 221 on the innermost side.

[0016] Specifically, the top sheet 21 can be formed from a laminated film in which a first sealant layer 211 and a base material layer 212 are laminated together. From the viewpoint of thermal adhesion, the material forming the first sealant layer 211 is preferably the same type of material as the material forming the first mouth member 24 and the second mouth member 25 described below.

[0017] Examples of materials that can be used to form the first sealant layer 211 include polyethylene and polypropylene. The material that can be used to form the first sealant layer 211 is preferably polypropylene. By using polypropylene as the material that can be used to form the first sealant layer 211, the sealed portion (heat-sealed portion) of the bag body 2 can obtain high adhesive strength in a high-temperature environment, and the bag body 2 can also have appropriate rigidity. As the polypropylene, unstretched polypropylene (CPP) can be suitably used.

[0018] It is more preferable that the material constituting the first sealant layer 211 contains block polypropylene, which can prevent the heat exchange medium L from permeating from the first sealant layer 211 into the base material layer 212.

[0019] The first sealant layer 211 may be composed of one layer or multiple layers. When the first sealant layer 211 is composed of multiple layers, it is preferably a three-layer structure in which a layer made of block polypropylene is sandwiched between two layers made of random polypropylene. The layer made of block polypropylene has the function of suppressing the heat exchange medium L from penetrating into the adjacent layers, and the layer made of random polypropylene has the function of firmly adhering to the other layers. Therefore, by adopting the above-mentioned three-layer structure, the durability of the bag body 2 can be improved.

[0020] The base material layer 212 may be composed of one layer or multiple layers. Fig. 6 is a schematic diagram of a cross section of a top sheet of a bag according to one embodiment. For example, as shown in Fig. 6, the base material layer 212 may be composed of multiple layers in which a metal layer 212a, resin layers 212b, and 212c are laminated in this order on a first sealant layer 211.

[0021] The metal layer 212a can be, for example, a metal foil, a metal vapor deposition film, or the like. Examples of materials that form the metal layer 212a include aluminum, copper, stainless steel, and titanium. Among these, it is preferable that the material that forms the metal layer 212a contains aluminum. This can further improve the cooling efficiency of the heat exchanger 1 and reduce its weight.

[0022] The thickness of the metal layer 212a is preferably 7 μm or more, and more preferably 30 μm or more. When the thickness of the metal layer 212a is 7 μm or more, the heat exchanger 1 can further improve the cooling efficiency and also obtain good handleability. The thickness of the metal layer 212a is preferably 60 μm or less, and more preferably 50 μm or less. When the thickness of the metal layer 212a is 60 μm or less, the bag body 2 can have sufficient flexibility to adhere closely to the heat exchange object.

[0023] In the example shown in FIG. 6, the resin layer is composed of two layers, but it may be composed of one layer or three or more layers. When the resin layers 212b and 212c are composed of two layers, for example, the inner resin layer 212b may be composed of nylon and the outer resin layer 212c may be composed of polyethylene terephthalate. When the resin layer 212b is composed of nylon, the bag 2 can improve its pressure resistance when the heat exchange medium L flows through the heat exchange flow path 23, and can suppress the occurrence of pinholes. When the resin layer 212c is composed of polyethylene terephthalate, the bag 2 can improve its scratch resistance. Examples of materials that can be used to compose the resin layers 212b and 212c include nylon, polyethylene terephthalate, and polyester.

[0024] The layers constituting the top sheet 21 may be bonded via an adhesive layer or an anchor layer, or may be bonded directly. The top sheet 21 may have layers other than the metal layer 212a and the resin layers 212b and 212c on the outside of the first sealant layer 211.

[0025] The configuration of the back sheet 22 is the same as that of the above-mentioned top sheet 21, and therefore a description thereof will be omitted. The configuration of the second sealant layer 221 is the same as that of the above-mentioned first sealant layer 211, and therefore a description thereof will be omitted.

[0026] The thickness of each of the top sheet 21 and the back sheet 22 is preferably 150 μm or more and 350 μm or less, and more preferably 200 μm or more and 300 μm or less.

[0027] 4 and 5, the bag 2 may have a peripheral seal portion S1 at its periphery, where the first sealant layer 211 and the second sealant layer 221 are joined, and an inner seal portion S2, where the first sealant layer 211 and the second sealant layer 221 are joined, on the inside of the peripheral seal portion S1. The peripheral seal portion S1 and the inner seal portion S2 are, for example, seal portions where the first sealant layer 211 and the second sealant layer 221 are heat-sealed. The bag 2 may be a pouch container.

[0028] The heat exchange flow path 23 is composed of a peripheral seal portion S1, an inner seal portion S2, and the inner surface of the bag body 2. In the example shown in FIG. 4, the heat exchange flow path 23 has a wave shape with three folded portions 23a, 23b, and 23c in a plan view. The shape of the heat exchange flow path 23 in a plan view may be, for example, a rectangular wave shape, a sine wave shape, a triangular wave shape, or the like. That is, the shape of the heat exchange flow path 23 in a plan view may be a shape with repeated U-shapes or a shape with repeated V-shapes. When the heat exchange flow path 23 has a wave shape in a plan view, the number of folded portions may be an odd number.

[0029] The pouch 2 has a clogging prevention member 26 provided on the surface of the top sheet 21. When the heat exchange object is a battery, the clogging prevention member 26 has the function of preventing the heat exchange flow path 23 from becoming thinner than the clogging prevention member 26 even if the battery expands and presses against the pouch 2, thereby preventing the heat exchange flow path 23 from being blocked. The clogging prevention member 26 can be, for example, a plate-like member or a protrusion. In the example shown in FIGS. 1 to 4, the clogging prevention member 26 is a long, thin plate-like member.

[0030] The height of the clogging prevention member 26 relative to the surface of the top sheet 21 at the inner seal portion S2 is lower than the height of the surface of the top sheet 21 that constitutes the heat exchange flow path 23. Here, "height" means the maximum height.

[0031] The clogging prevention member 26 may be provided on at least a portion of the surface of the top sheet 21 at the peripheral seal portion S1 and the inner seal portion S2. That is, the clogging prevention member 26 may or may not overlap the heat exchange channel 23 when viewed from a direction perpendicular to the top sheet 21 (the X direction). If the clogging prevention member 26 is provided at a position overlapping the heat exchange channel 23 when viewed from the X direction, when the clogging prevention member 26 comes into contact with and is pressed by a battery to be replaced, the clogging prevention member 26 presses against the heat exchange channel 23, blocking a portion of the heat exchange channel 23, but the heat exchange medium L may flow through the remaining portions. By providing the clogging prevention member 26 on at least a portion of the surface of the top sheet 21 at the peripheral seal portion S1 and the inner seal portion S2, the clogging prevention member 26 does not press against the heat exchange channel 23, preventing the heat exchange channel 23 from being narrowed in the Y-axis direction (narrowing the width of the heat exchange channel 23).

[0032] The clogging prevention member 26 may be provided at a position overlapping with a portion of the width direction of the heat exchange flow path 23 in a plan view. That is, the clogging prevention member 26 need not be provided across the entire width direction (from one end to the other end) of the heat exchange flow path 23 in a plan view. By providing the clogging prevention member 26 at a position overlapping with a portion of the width direction of the heat exchange flow path 23 in a plan view, even if the clogging prevention member 26 comes into contact with and presses against the battery to be replaced and presses against the heat exchange flow path 23, it is possible to prevent the heat exchange flow path 23 from being completely blocked in the width direction and the flow of the heat exchange medium L from being blocked.

[0033] Fig. 7 is a view showing a cross section taken along line II-II in Fig. 4. Fig. 7 shows a cross section of Fig. 4 in a state where the anti-clogging member 26 is attached to the top sheet 21. The top sheet 21 in the inner seal portion S2 may have a through hole 213, as shown in Figs. 4 and 7. The second sealant layer 221 has an exposed portion E exposed from the through hole 213, and the anti-clogging member 26 is heat-sealed to the exposed portion E.

[0034] The through holes 213 may be formed in the top sheet 21 in either the peripheral seal portion S1 or the inner seal portion S2, or may be formed in the top sheet 21 in both the peripheral seal portion S1 and the inner seal portion S2. In the example shown in Fig. 4, a plurality of through holes 213 are formed in the top sheet 21 in the inner seal portion S2, spaced apart from one another, along the extension direction of the inner seal portion S2.

[0035] Examples of materials that can be used to form the anti-clogging member 26 include polyethylene and polypropylene. The anti-clogging member 26 and the second sealant layer 221 preferably contain the same type of resin. For example, the material that can be used to form the anti-clogging member 26 includes polypropylene, and the material that can be used to form the second sealant layer 221 includes unstretched polypropylene.

[0036] Fig. 8 is a cross-sectional view of another example of the bag taken along line II-II of Fig. 4. As shown in Fig. 8, the clogging prevention member 26 may be fixed to the surface of the topsheet 21 via an adhesive layer 27. In this case, the topsheet 21 in the peripheral seal portion S1 and the inner seal portion S2 does not need to have through holes 213. Also, double-sided tape or the like can be used instead of the adhesive layer 27.

[0037] 8, when the clogging prevention member 26 and the top sheet 21 are fixed with an adhesive, double-sided tape, or the like, the clogging prevention member 26 does not need to be heat-sealed to the second sealant layer 221, and therefore, a material that cannot be heat-sealed to the second sealant layer 221, such as a metal or a resin with a relatively high melting point, can be used as the material for the clogging prevention member 26. This can also suppress thermal deformation of the clogging prevention member 26 when the battery is running.

[0038] The bag body 2 may include a first mouth member 24 having an inlet 241 and a second mouth member 25 having an outlet 251. The first mouth member 24 and the second mouth member 25 are provided between the top sheet 21 and the back sheet 22, and are heat-sealed to the first sealant layer 221 and the second sealant layer 221, respectively.

[0039] The material constituting the first mouth member 24 and the second mouth member 25 can be suitably used as long as it can bond with the first sealant layer 211 and the second sealant layer 221 to ensure hermetic sealing, and is preferably a material that can be heat-sealed with the first sealant layer 211 and the second sealant layer 221. From the viewpoint of heat-sealing properties, the material constituting the first mouth member 24 and the second mouth member 25 is more preferably the same type of material as the material constituting the first sealant layer 211 and the second sealant layer 221.

[0040] The first and second mouth members 24 and 25 may be cylindrical members and may have a flange extending outward from one end. The first and second mouth members 24 and 25 may be spouts. When the first and second mouth members 24 and 25 are spouts having a flange, the contact areas between the first and second mouth members 24 and 25 and the first sealant layer 211 and the second sealant layer 221, respectively, are increased, thereby increasing the adhesive strength therebetween.

[0041] When the shape of the bag body 2 is quadrangular in a plan view, the first port member 24 and the second port member 25 are provided on one side of the bag body 2. With this configuration, the supply flow path 31 and the recovery flow path 32 can be arranged together on that one side of the bag body 2, making it possible to reduce the size of the heat exchanger 1. In the example shown in FIGS. 1 to 4, the shape of the bag body 2 is rectangular in a plan view, and the first port member 24 and the second port member 25 are provided on the short sides of the bag body 2.

[0042] The base 3 may be a plate-like body. As shown in Fig. 3 , the base 3 has a first boss portion 33 having an outlet hole 331 that communicates with the supply flow path 31 and through which the heat exchange medium L flows out, and a second boss portion 34 that communicates with the recovery flow path 32 and has an inlet hole 341 through which the heat exchange medium L flows in. The first boss portion 33 is fitted into the inlet 241, and the second boss portion 34 is fitted into the outlet 251. By fitting the first boss portion 33 into the inlet 241 and the second boss portion 34 into the outlet 251, the outlet hole 331 of the first boss portion 33 and the inlet 241 of the bag body 2 are communicated with each other, and the inlet hole 341 of the second boss portion 34 and the outlet 251 of the bag body 2 are communicated with each other. The outlet hole 331 and the inlet 241 are arranged coaxially, and the inlet 341 and the outlet 251 are arranged coaxially.

[0043] The base body 3 may have a plurality of first boss portions 33 and a plurality of second boss portions 34. When the base body 3 has a plurality of first boss portions 33 and a plurality of second boss portions 34, a plurality of pairs of the first boss portions 33 and the second boss portions 34 are provided spaced apart from each other on the back surface of the base body 3 (the surface on the side where the bag body 2 is arranged).

[0044] The first boss 33 and the inlet 241, and the second boss 34 and the outlet 251 are respectively fitted together in a liquid-tight manner. The first boss 33 and the inlet 241, and the second boss 34 and the outlet 251 may be fitted together via an O-ring, by heat fusion, or by an adhesive. An example of the adhesive is an adhesive containing modified silicone.

[0045] 9 is a diagram illustrating the flow of a heat exchange medium in a heat exchanger according to one embodiment. In FIG. 9, the supply flow path 31, the recovery flow path 32, and the heat exchange flow path 23 are indicated by dashed lines, and other components are omitted. Also, in FIG. 9, arrows indicate the flow of the heat exchange medium L. As shown in FIG. 9, the heat exchange medium L flowing through the supply flow path 31 inside the base 3 flows from the inlet 241 of the bag 2 through the outlet hole 331 into one end (the upstream end) of the heat exchange flow path 23 inside the bag 2. Upon reaching the other end of the heat exchange flow path 23, the heat exchange medium L flows from the inlet 341 through the outlet 251 of the bag 2 into the recovery flow path 32 inside the base 3.

[0046] The heat exchange medium L exchanges heat with the heat exchange object while flowing through the heat exchange flow path 23 and circulates as shown in FIG. 9, allowing the heat exchange device 1 to maintain its cooling performance. When the heat exchange device 1 includes multiple bags 2, the heat exchange medium L flowing through the supply flow path 31 inside the base 3 is diverted to the inlets 241 of the multiple bags 2, and the heat exchange medium L flowing out from the outlets 251 of the multiple bags 2 merges into the recovery flow path 32 inside the base 3. The heat exchange medium L that merges into the recovery flow path 32 is sent to, for example, a radiator or the like, where it is cooled, and then returns to the supply flow path 31. In the example shown in FIG. 9, the heat exchange medium L flowing through the supply flow path 31 is diverted in a direction perpendicular to the supply flow path 31, and the heat exchange medium L flowing out from the outlets 251 of the multiple bags 2 merges into the recovery flow path 32 in a direction perpendicular to the supply flow path 31.

[0047] The base 3 has a first groove 35 and a second groove 36 that open on a surface F1 (the surface opposite to the surface on which the bag 2 is disposed) and extend in a first direction (X direction), and the first groove 35 and the second groove 36 are arranged in parallel. That is, the surface F1 of the base 3 has two openings 351 and 361. The base 3 has sealing members 37 that seal the openings 351 and 361 of the first groove 35 and the second groove 36, respectively. The base 3 may have two sealing members 37, and one opening may be sealed with one sealing member 37. The base 3 may have one sealing member 37, and the two openings 351 and 361 may be sealed with one sealing member 37.

[0048] The sealing member 37 can be a film-like member or a sheet-like member. The thickness of the sealing member 37 can be, for example, 10 μm or more and 100 μm or less. The sealing member 37 may have a heat-sealable resin layer on one surface. When the sealing member 37 has a heat-sealable resin layer on one surface, the heat-sealable resin layer and the surface F1 of the base 3 may be heat-sealed. Examples of materials that can be used to form the heat-sealable resin layer include polyethylene and polypropylene. The heat-sealable resin layer may be composed of one layer or multiple layers.

[0049] Fig. 10 is a schematic cross-sectional view illustrating a method for manufacturing a heat exchanger according to one embodiment. Fig. 10 shows a cross section (cross section II-II in Fig. 4) at the same position as the cross section shown in Fig. 7. One example of a method for manufacturing the heat exchanger of this embodiment includes the steps of: preparing a bag 2 having a heat exchange flow path 23 therein through which a heat exchange medium L flows; preparing a base 3 having a supply flow path 31 therein for supplying the heat exchange medium L to the heat exchange flow path 23 and a recovery flow path 32 for recovering the heat exchange medium L; and attaching the bag 2 to the base 3 so that one end of the heat exchange flow path 23 communicates with the supply flow path 31 and the other end of the heat exchange flow path 23 communicates with the recovery flow path 32.

[0050] The process of preparing the bag body 2 also includes the steps of forming a plurality of through holes 213 in a region where a seal portion is to be formed in a top sheet 21 having a first sealant layer 211 on one side, overlapping the top sheet 21 with the through holes 213 formed therein with a back sheet 22 having a second sealant layer 221 on one side so that the first sealant layer 211 and the second sealant layer 221 face each other, as shown in FIG. 10, and placing an anti-blocking member 26 on the region where a seal portion is to be formed in the top sheet 21, and heat-sealing the second sealant layer 221 exposed from the through holes 213 to the anti-blocking member 26 in the region where a seal portion is to be formed, as well as heat-sealing the opposing first sealant layer 211 and second sealant layer 221, as shown in FIG. 7. This allows the second sealant layer 221 and the blockage prevention member 26, as well as the opposing first sealant layer 211 and second sealant layer 221, to be heat-sealed simultaneously, simplifying the manufacturing process and making it easy to manufacture the heat exchanger device 1.

[0051] In the step of forming the plurality of through holes 213, the through holes 213 can be formed by, for example, punching.

[0052] <Battery pack> FIG. 11 is a perspective view of a battery pack according to one embodiment as viewed from one direction. As shown in FIG. 11, a battery pack 10 of this embodiment includes the heat exchange device 1 of this embodiment and a plurality of battery cells 4. Each of the plurality of battery cells 4 is disposed between each of the plurality of pouches 2. It is preferable that each of the plurality of battery cells 4 is disposed in contact with an adjacent pouch 2. In the example shown in FIG. 8, when viewed from the X direction, the outer dimensions of the battery cells 4 are smaller than the outer dimensions of the pouch 2, but may be larger than or the same as the outer dimensions of the pouch 2.

[0053] The battery pack 10 may include a support member 5 that supports the plurality of battery cells 4. The battery pack 10 may further include a cover (not shown) that covers the heat exchange device 1 and the plurality of battery cells 4.

[0054] As described above, the heat exchanger 1 of this embodiment includes the bag 2 and the base 3 having the supply flow path 31 and the recovery flow path 32. The bag 2 includes the top sheet 21, the back sheet 22, the inlet 241, the outlet 251, and the clogging prevention member 26. This configuration allows the bag 2 to be positioned facing both sides of the heat exchange object, enabling cooling from both sides of the heat exchange object. Furthermore, if the heat exchange object is a battery, the bag 2 can adapt to the battery's deformation and maintain contact with the battery even if the battery expands due to charging / discharging, aging, internal pressure increase, etc. Furthermore, even as the battery expands, the clogging prevention member 26 abuts against the battery, preventing the bag 2 and the battery from approaching each other beyond a certain distance, thereby preventing the heat exchange flow path 23 from being blocked. Therefore, the heat exchanger 1 can improve cooling performance.

[0055] In this embodiment, the bag 2 has a top sheet 21 made of a laminate film with a first sealant layer 211 on its innermost side, and a back sheet 22 made of a laminate film with a second sealant layer 221 on its innermost side. The bag 2 also has a peripheral seal portion S1 and an inner seal portion S2, and the heat exchange flow path 23 is made of the peripheral seal portion S1, the inner seal portion S2, and the inner surface of the bag 2. This configuration allows the width of the inner seal portion S2 to be relatively small, thereby increasing the ratio of the area of ​​the heat exchange flow path 23 to the area of ​​the bag 2. Therefore, the heat exchange device 1 can relatively increase the contact area between the heat exchange medium L and the heat exchange object, further improving cooling performance.

[0056] In this embodiment, the clogging prevention member 26 is provided on at least a portion of the surface of the top sheet 21 in the inner seal portion S2. With this configuration, when the heat exchange object is a battery, even if the battery expands and presses the clogging prevention member 26, the clogging prevention member 26 will not press the heat exchange flow path 23 in the bag body 2, thereby further preventing clogging of the heat exchange flow path 23. Therefore, the heat exchange device 1 can further improve cooling performance.

[0057] In this embodiment, the top sheet 21 in the peripheral seal portion S1 and the inner seal portion S2 has through holes 213, the second sealant layer 221 has exposed portions E exposed from the through holes 213, and the clogging prevention members 26 are heat-sealed to the exposed portions E. With this configuration, the clogging prevention members 26 are heat-sealed to the second sealant layer 221 via the through holes 213, and are therefore bonded to the second sealant layer 221 with sufficient adhesive strength. This prevents the clogging prevention members 26 from coming off the top sheet 21, thereby further preventing the heat exchange flow paths 23 from being clogged.

[0058] In this embodiment, the anti-clogging member 26 and the second sealant layer 221 contain the same type of resin. This improves the adhesive strength between the anti-clogging member 26 and the second sealant layer 221 by thermal fusion. This further prevents the anti-clogging member 26 from coming off the top sheet 21, and further prevents the heat exchange flow path 23 from being blocked.

[0059] In this embodiment, each of the top sheet 21 and the back sheet 22 includes a metal layer, which allows the heat exchange device 1 to improve heat exchange efficiency and further improve cooling performance.

[0060] In this embodiment, a plurality of pouches 2 are attached in parallel to and spaced apart from one another to the base 3. With this configuration, when the heat exchange object is a battery, each of the plurality of battery cells constituting the battery can be disposed between the plurality of pouches 2, and all of the battery cells can be cooled from both sides. Therefore, the heat exchange device 1 can further improve cooling performance.

[0061] The battery pack 10 of this embodiment includes a heat exchange device 1 and a plurality of battery cells 4, each of which is disposed between a plurality of pouches 2. With this configuration, the heat exchange device 1 can cool the battery cells 4 from both sides. Furthermore, even if the battery cells 4 expand due to charging / discharging, aging, an increase in internal pressure, or the like, the pouch 2 can follow the deformation of the battery cells 4 and maintain contact with the battery cells 4. Therefore, the battery pack 10 can suppress blockage of the heat exchange flow path 23 and improve cooling performance.

[0062] (Aspects of the present invention) The present invention includes the following aspects. <Aspect 1> a bag body having a heat exchange flow path therein through which a heat exchange medium flows; a base body having therein a supply flow path communicating with one end of the heat exchange flow path and supplying the heat exchange medium to the heat exchange flow path, and a recovery flow path communicating with the other end of the heat exchange flow path and recovering the heat exchange medium, The bag body is a heat exchange device having a top sheet, a back sheet opposite the top sheet, an inlet through which the heat exchange medium flows, an outlet through which the heat exchange medium flows out, and an anti-clogging member provided on the surface of the top sheet. <Aspect 2> the top sheet is composed of a laminated film having a first sealant layer on the innermost side, the backsheet is composed of a laminated film having a second sealant layer on the innermost side; the bag body has a peripheral seal portion at a peripheral edge where the first sealant layer and the second sealant layer are joined, and an inner seal portion inside the peripheral seal portion where the first sealant layer and the second sealant layer are joined, In the heat exchange device according to aspect 1, the heat exchange passage is constituted by the peripheral seal portion, the inner seal portion, and the inner surface of the pouch. <Aspect 3> In the heat exchange device according to aspect 2, the clogging prevention member is provided on at least a part of the surface of the top sheet in the inner seal portion. <Aspect 4> The surface sheets of the peripheral seal portion and the inner seal portion have through holes, the second sealant layer has an exposed portion exposed from the through hole, In the heat exchange device according to aspect 2 or 3, the clogging prevention member is heat-sealed to the exposed portion. <Aspect 5> Aspects 5. The heat exchange device according to any one of Aspects 2 to 4, wherein the anti-clogging member and the second sealant layer contain the same type of resin. <Aspect 6> Aspects 6. The heat exchange device according to any one of Aspects 1 to 5, wherein each of the top sheet and the back sheet includes a metal layer. <Aspect 7> Aspect 7 is a heat exchange device according to any one of aspects 1 to 6, wherein a plurality of the pouches are attached to the base in parallel and spaced apart from one another. <Aspect 8> A heat exchange device according to aspect 7; and a plurality of battery cells; Each of the plurality of battery cells is a battery pack disposed between each of the plurality of pouches.

[0063] The heat exchanger 1 of this embodiment includes a heat exchanger for cooling a vehicle battery. The heat exchanger 1 can also be used as a heat exchanger for cooling an electric motor mounted on a vehicle, a heat exchanger for cooling a power semiconductor element of an electrically powered device, etc. The heat exchanger 1 can also be used as a heat exchanger for heating by using a heat exchange medium L for heating.

[0064] Although the embodiments have been described above, they are presented as examples and the present invention is not limited to the above embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as set forth in the claims. [Explanation of symbols]

[0065] 1 Heat exchange device 2 bags 21 Surface sheet 211 First sealant layer 213 Through hole 22 Back sheet 221 Second sealant layer 23 Heat exchange channel 241 Inlet 251 Outlet 26 Blockage prevention member 3 Base 31 Supply channel 32 Recovery channel 4 battery cells 10 Battery Pack L Heat exchange medium S1 Peripheral seal S2 Inner seal E Exposed part

Claims

1. a bag body having a heat exchange flow path therein through which a heat exchange medium flows; a base body having therein a supply flow path communicating with one end of the heat exchange flow path and supplying the heat exchange medium to the heat exchange flow path, and a recovery flow path communicating with the other end of the heat exchange flow path and recovering the heat exchange medium, The bag body is a heat exchange device having a top sheet, a back sheet opposite the top sheet, an inlet through which the heat exchange medium flows, an outlet through which the heat exchange medium flows out, and an anti-clogging member provided on the surface of the top sheet.

2. the top sheet is composed of a laminated film having a first sealant layer on the innermost side, the backsheet is composed of a laminated film having a second sealant layer on the innermost side; the bag body has a peripheral seal portion at a peripheral edge portion where the first sealant layer and the second sealant layer are joined together, and an inner seal portion inside the peripheral seal portion where the first sealant layer and the second sealant layer are joined together, The heat exchange device according to claim 1 , wherein the heat exchange passage is formed by the peripheral seal portion, the inner seal portion, and the inner surface of the pouch.

3. The heat exchange device according to claim 2 , wherein the clogging prevention member is provided on at least a part of the surface of the top sheet in the peripheral seal portion and the inner seal portion.

4. The surface sheet of the inner seal portion has a through hole, the second sealant layer has an exposed portion exposed from the through hole, The heat exchange device according to claim 3 , wherein the clogging prevention member is heat-sealed to the exposed portion.

5. The heat exchange device according to claim 4 , wherein the anti-blocking member and the second sealant layer comprise the same type of resin.

6. The heat exchange device according to claim 5 , wherein each of the top sheet and the back sheet includes a metal layer.

7. The heat exchange device according to any one of claims 1 to 6, wherein a plurality of the pouches are attached to the base in parallel and spaced apart from one another.

8. The heat exchange device according to claim 7; a plurality of battery cells; A battery pack in which each of the plurality of battery cells is disposed between each of the plurality of pouches.

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