JP2015232957A - Jacket member with cooling fin for electrochemical device, and electrochemical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jacket member for an electrochemical device that is able to efficiently discharge heat from the electrochemical device without decreasing volume energy density even whether it is used as a jacket for a small electrochemical device or a large electrochemical device.SOLUTION: The jacket member comprises: a heat-resistant resin stretched film layer 2 as an outside layer; a thermoplastic resin unstretched film layer 3 as an inside layer; and a metal foil layer disposed between these film layers. The jacket member 1 is molded in a cubic shape having a storage case 42 that is approximately parallelepiped and is open at the bottom; and sealing peripheral edge parts 43 extended outward substantially horizontally from four edges forming the bottom opening of the storage case 42. One or more fins 5 are projected upward on the outside layer 2 side surface of the sealing peripheral edge part 43 extended from one of the four edges forming the bottom opening.

Description

  The present invention relates to batteries and capacitors used for portable devices such as smartphones and tablets, hybrid vehicles, electric vehicles, wind power generation, solar power generation, and electrochemical devices such as batteries and capacitors used for power storage for night electricity. The present invention relates to an exterior material having excellent heat dissipation performance and an electrochemical device that is exteriorized with the exterior material.

  In the present specification and claims, the term “metal” is used to include a simple metal and an alloy, and the term “aluminum” is used to include aluminum and an alloy thereof.

  In recent years, with the reduction in thickness and weight of mobile electrical devices such as smartphones and tablet terminals, the exterior materials of lithium ion batteries and lithium polymer batteries mounted thereon are replaced with conventional metal cans with a thickness of 20 to A laminate exterior material in which a plastic film is bonded to both surfaces of an aluminum foil of about 100 μm is used to reduce the weight. In addition, as an application, packaging of a power source for an electric vehicle or the like, a large-scale power source for power storage, a capacitor, or the like with the laminate exterior material having the above-described configuration has been studied.

  In general, an electrochemical device using a laminate outer material is thinner than an electrochemical device using a metal can and has a large surface area per volume, so it has excellent heat dissipation and charging and discharging. Therefore, it is said that heat generated from the inside of the electrochemical device is easily radiated to the outside.

  However, for example, when mounted on mobile devices that are frequently used, or when these electrochemical devices are stacked and used with a reduced surface area in contact with the outside, for example, in automobile applications, In such a case, means for improving heat dissipation (cooling means) is necessary in order to prevent the thermal deterioration.

  For example, in Patent Document 1, an electrode laminated battery is pressed by a pair of pressing members from both sides, and the pressing member protrudes outward from the peripheral edge of the electrode stacked battery, and a protruding portion of the pressing member extends outside. Has been proposed as a heat radiating part for radiating heat generated from the electrode laminated battery.

  Patent Document 2 discloses that heat is generated inside the electrochemical device by forming a plurality of concave and convex structures on at least one of the planar portions that are the maximum area of the exterior body that houses the power generation element. It can be dissipated.

Japanese Patent Laid-Open No. 2004-3281 JP 2003-288863 A

  However, the technique described in Patent Document 1 requires a holding member with good heat dissipation, and as a result of using such a holding member, weight and volume increase (volume energy density decreases). As a result, it is difficult to mount on a mobile device and the manufacturing cost increases.

  Moreover, in the technique of the said patent document 2, since several uneven structure is formed in the plane part of the largest area of an exterior body, the thickness as an electrochemical device increases and the problem that volume energy density falls. there were. In addition, since the formation of the concavo-convex structure is a flat portion of the outer package (upper surface portion in FIG. 1 of Patent Document 2), a sufficient heat dissipation effect cannot be obtained.

  The present invention has been made in view of such a technical background, and even when used for the exterior of a small electrochemical device (battery or the like) mounted on a mobile device or the like, the present invention is also applied to an automobile or the like. Electrochemistry that can efficiently dissipate heat from electrochemical devices without reducing volumetric energy density, even when used for the exterior of large electrochemical devices (batteries, etc.) It is an object of the present invention to provide a packaging material with cooling fins for devices and an electrochemical device coated with the packaging material.

  In order to achieve the above object, the present invention provides the following means.

[1] A packaging material for electrochemical devices, comprising a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between these two film layers In
The exterior material includes a storage case having a substantially rectangular parallelepiped shape with an open lower surface, and a sealing peripheral edge extending outward in a substantially horizontal direction from four sides forming a lower surface opening of the storage case. Formed into a three-dimensional shape having
One or a plurality of fins project upwardly from the surface on the outer layer side of the sealing peripheral edge extending from one of the four sides forming the lower surface opening. An exterior material with cooling fins for electrochemical devices.

  [2] The electrochemical device according to [1], wherein the fin protrudes from the surface on the outer layer side of the peripheral edge for sealing, which is extended from one side of the four sides where the tab is disposed. Exterior material with cooling fins.

[3] A packaging material for electrochemical devices, including a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between the two film layers. In
The outer packaging material is a substantially rectangular parallelepiped storage case whose bottom surface is open and a seal extending from the three sides of the four sides forming the lower surface opening of the storage case to the outside in a substantially horizontal direction. A peripheral edge for stopping, and an extension part for closing the lower surface opening that extends from the remaining one of the four sides,
One or more fins projecting upward on the surface on the outer layer side of the sealing peripheral edge extending from one of the three sides, for an electrochemical device Exterior material with cooling fins.

  [4] The electrochemical device according to [3], wherein the fin protrudes from the surface on the outer layer side of the peripheral edge for sealing, which is extended from one side of the three sides on which the tab is disposed. Exterior material with cooling fins.

  [5] The electrochemical device according to any one of [1] to [4], wherein a height of the fin is 0.5 mm or more and not more than a thickness of the electrochemical device to be accommodated. Exterior material with cooling fins.

[6] The fin is projectingly formed by partially folding a laminated material including the outer layer, the inner layer, and the metal foil layer,
The exterior material with a cooling fin for an electrochemical device according to any one of 1 to 5 above, wherein inner layers overlapped by the folding process inside the fin are welded and joined.

  [7] The packaging material with cooling fins for an electrochemical device according to [6], wherein the packaging material has a thickness of 0.05 mm to 0.3 mm.

[8] The length direction of the fin substantially coincides with the length direction of the sealing peripheral portion provided with the fin,
Cuts are provided from the top to the bottom of the fin on both ends in the length direction of the fin, and the positions where the cuts are provided are the two sides of the four sides that are substantially orthogonal to the length direction of the fin. 8. The packaging material with a cooling fin for an electrochemical device according to any one of 1 to 7 above, wherein the virtual extension line and the fin intersect with each other.

[9] A first exterior material comprising the exterior material with a cooling fin according to 1 or 2 above,
A second exterior material comprising a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between these two film layers;
An electrochemical device body, and
The second exterior material has no fins on the surface,
The electrochemical device main body is accommodated in the housing case of the first exterior material, and the first exterior material and the second exterior material are overlapped so as to seal the lower surface opening of the first exterior material, An electrochemical device, wherein an inner layer of a sealing peripheral portion of the first exterior material and a peripheral portion of an inner layer of the second exterior material are joined and sealed.

[10] Two exterior materials with cooling fins according to item 1 or 2,
An electrochemical device body, and
The two outer packaging materials with cooling fins are arranged so that the inner layers face each other, and the housing recesses of the respective housing cases of the two outer packaging materials with cooling fins are combined to form the housing space. The electrochemical device body is located,
An electrochemical device characterized in that the inner layers of the sealing peripheral portions of the two outer packaging materials with cooling fins are joined and sealed.

[11] One exterior material with a cooling fin according to the above item 3 or 4,
An electrochemical device body, and
The electrochemical device main body is accommodated in the housing case of the exterior material with cooling fins, and the extension portion for closing the lower surface opening of the exterior material with cooling fin is folded, and the folded extension portion for sealing The lower surface opening of the housing case is sealed, and the inner layer of the sealing peripheral portion of the exterior member with cooling fin is joined to the inner layer of the peripheral portion of the folded extension portion of the sealing member with cooling fin. An electrochemical device characterized by being sealed.

[12] The length direction of the fin substantially coincides with the length direction of the sealing peripheral portion provided with the fin,
Cuts are provided from the top to the bottom of the fin at both ends in the length direction of the fin, and the positions where the cuts are provided are two sides of the four sides that are substantially orthogonal to the length direction of the fin. It is the position where each virtual extension line and the fin intersect,
Sealing peripheral portions extending from two sides substantially orthogonal to the length direction of the fin among the four sides are overlapped and joined to corresponding side walls of the housing case, respectively. 12. The electrochemical device according to any one of 9 to 11 above.

  In the inventions of [1] and [2], the exterior material is formed in a substantially rectangular parallelepiped shape with a lower surface opened from the four sides that form the lower surface opening of the housing case, and toward the outer side in a substantially horizontal direction. 1 to a surface on the outer layer side in the sealing peripheral portion which is formed into a three-dimensional shape having an extended sealing peripheral portion and extends from one of the four sides forming the lower surface opening. A configuration in which a plurality of fins protrudes upward is employed. Heat generation during charging / discharging of the electrochemical device is concentrated in the vicinity of the tab. Therefore, when configuring the electrochemical device covered with the outer packaging material of the present invention, the sealing peripheral portion on the side where the fins are provided By disposing the tab in the heat generation, the heat generation around the tab of the electrochemical device can be efficiently radiated.

  Furthermore, when the electrochemical device main body is packaged with the exterior material of the present invention, the sealing peripheral portion (heat seal portion) on the side where the tab is disposed cannot be bent. The space on the outer layer side of the sealing peripheral portion (heat seal portion) on the side to be sealed (the space just outside the side wall on the side where the tab in the housing case is placed) 90 is conventionally a dead space (effective However, if the exterior material of the present invention is used, one or more fins 5 are arranged in the dead space 90 ( As shown in FIG. 4, it is possible to efficiently dissipate heat generated around the tab of the electrochemical device while effectively utilizing such a dead space. Since such dead space is effectively utilized (since the volume of the electrochemical device is not newly increased), the volume energy density of the electrochemical device is not reduced.

  Therefore, according to the exterior material of the present invention, even when used for the exterior of a small electrochemical device (battery or the like) mounted on a mobile device or the like, the large-scale electrochemical mounted on an automobile or the like. Even when used for the exterior of a device (battery or the like), heat from the electrochemical device can be efficiently dissipated without reducing the volume energy density.

  In the inventions of [3] and [4], the exterior material has a substantially rectangular parallelepiped shape with the upper surface opened and three sides of the four sides forming the upper surface opening of the housing case in a substantially horizontal direction. 1 side of said 3 sides provided with the peripheral part for sealing extended outward, and the extension part for upper surface opening | mouth opening sealing extended from the remaining 1 side of the said 4 sides A configuration in which one or a plurality of fins project from the surface on the outer layer side of the peripheral edge for sealing extended from is adopted. Heat generation during charging / discharging of the electrochemical device is concentrated in the vicinity of the tab. Therefore, when configuring the electrochemical device covered with the outer packaging material of the present invention, the sealing peripheral portion on the side where the fins are provided By disposing the tab in the heat generation, the heat generation around the tab of the electrochemical device can be efficiently radiated.

  Furthermore, when the electrochemical device main body is packaged with the exterior material of the present invention, the sealing peripheral portion (heat seal portion) on the side where the tab is disposed cannot be bent. The space on the outer layer side of the sealing peripheral portion (heat seal portion) on the side to be sealed (the space just outside the side wall on the side where the tab in the housing case is placed) 90 is conventionally a dead space (effective However, if the exterior material of the present invention is used, one or more fins 5 are arranged in the dead space 90 ( As shown in FIG. 4, it is possible to efficiently dissipate heat generated around the tab of the electrochemical device while effectively utilizing such a dead space. Since such dead space is effectively utilized (since the volume of the electrochemical device is not newly increased), the volume energy density of the electrochemical device is not reduced.

  Therefore, according to the exterior material of the present invention, even when used for the exterior of a small electrochemical device (battery or the like) mounted on a mobile device or the like, the large-scale electrochemical mounted on an automobile or the like. Even when used for the exterior of a device (battery or the like), heat from the electrochemical device can be efficiently dissipated without reducing the volume energy density.

  In the invention of [5], since the fin height is 0.5 mm or more, the heat generated around the tab of the electrochemical device can be radiated more efficiently. Further, since the height of the fin is set to be equal to or less than the thickness of the electrochemical device to be accommodated, the fin can be accommodated in the dead space, and the volume of the electrochemical device is not newly increased. Therefore, the volume energy density of the electrochemical device is not reduced.

  In the invention of [6], the laminated material including the outer layer, the inner layer, and the metal foil layer is formed by protruding the ribs by being partially folded so that the ribs can be easily formed. . In addition, since the inner layers overlapped by the folding process inside the ribs are welded and joined together, it is possible to form a stable rising rib and (there is no gap between the overlapped inner layers) ) The heat dissipation can be further improved.

  In the invention of [7], the thickness of the exterior material is set to 0.05 mm to 0.3 mm, and the thickness of the fin can be sufficiently secured by being 0.05 mm or more, so that the tab of the electrochemical device The surrounding heat can be sufficiently dissipated through the fins, and the thickness of 0.3 mm or less facilitates the formation of the fins by folding.

  In the invention of [8], a cut is provided from the top to the bottom of the fin on both ends in the length direction of the fin, and the position where the cut is provided is substantially orthogonal to the length direction of the fin among the four sides. Since each virtual extension line on each of the two sides intersects with the fin, a pair of sealing (a pair of right and left facing each other) intersecting with the sealing peripheral portion on the side where the fin is provided When adopting a configuration in which the peripheral portions are bent (started up) and overlapped with the side walls of the storage cases, the pair of sealing peripheral portions can be easily bent without any trouble by providing cuts. It can be superimposed on the side wall of the storage case.

  In the invention of [9], since the exterior material with cooling fins of [1] or [2] is used as one exterior material, as a small electrochemical device (battery or the like) mounted on a mobile device or the like. Whether it is used or as a large electrochemical device (battery etc.) mounted in an automobile or the like, the heat from the electrochemical device is reduced without reducing the volume energy density. Can be efficiently dissipated.

  In the invention of [10], since the two outer packaging materials with cooling fins of [1] or [2] are used as a pair of upper and lower exterior materials, a small electrochemical device (battery or the like) mounted on a mobile device or the like. ), And even when used as a large-sized electrochemical device (battery etc.) mounted on an automobile or the like, from the electrochemical device without reducing the volume energy density. Heat can be radiated more efficiently.

  In the invention of [11], since one piece of the packaging material with cooling fins of [3] or [4] above is used, the housing case can be folded by folding and extending the lower surface opening sealing extension. Since the lower surface opening can be sealed, the number of parts can be reduced and the cost can be reduced. In addition, even if this electrochemical device is used as a small electrochemical device (battery or the like) mounted on a mobile device or the like, it is also a large electrochemical device (battery or the like) mounted on an automobile or the like. Even when used as, the heat from the electrochemical device can be radiated more efficiently without reducing the volumetric energy density.

  In the invention of [12], a cut is provided from the top to the bottom of the fin at both ends in the length direction of the fin, and the position where the cut is provided is the length direction of the fin among the four sides. Since each of the virtual extension lines of two substantially perpendicular sides intersects the fin, the sealing periphery extended from two sides of the four sides substantially perpendicular to the length direction of the fin It is possible to easily realize a configuration in which the portions are bent (raised) and overlapped and joined to the corresponding side wall of the housing case without any trouble. In addition, since the sealing peripheral edge extending from two sides substantially orthogonal to the length direction of the fin is overlapped and joined to the corresponding side wall of the housing case, further space saving is achieved. This can further increase the volume energy density of the electrochemical device.

It is a perspective view which shows one Embodiment of the exterior material with the cooling fin for electrochemical devices which concerns on this invention. It is sectional drawing of VV in FIG. It is a perspective view which shows the manufacturing method of the cladding | exterior_material with the cooling fin for electrochemical devices in order of a process, (A) is the state in which the storage case was formed by shaping | molding, (B) is a cooling fin protrudingly provided by folding processing The formed state, (C) shows the state in which the surplus portion was removed by trimming to obtain a cooling fin-equipped exterior material. It is sectional drawing which shows 1st Embodiment of the electrochemical device which concerns on this invention (sectional drawing of the electrochemical device in the position corresponding to the XX line in FIG. 5). The perspective view shown in the separated state before heat-sealing the 1st exterior material (exterior material with a cooling fin), the electrochemical device main-body part, and the 2nd exterior material (exterior material without a fin) which comprise the electrochemical device of FIG. It is. Sectional drawing which shows the seal | sticker joining state in the heat seal part of the peripheral part of the electrochemical device of FIG. 4 (The electrochemical which expands and shows one fin and its vicinity part in the position corresponding to the YY line in FIG. It is sectional drawing of a device. It is sectional drawing which shows a 2nd exterior material. It is sectional drawing which shows 2nd Embodiment of the electrochemical device which concerns on this invention (sectional drawing of the electrochemical device in the position corresponding to the ZZ line | wire in FIG. 9). It is a perspective view shown in the separated state before heat-sealing one exterior material with a cooling fin which comprises the electrochemical device of FIG. 8, an electrochemical device main-body part, and the other exterior material with a cooling fin. It is sectional drawing which shows other embodiment of the exterior material with the cooling fin for electrochemical devices which concerns on this invention. It is a perspective view which shows the manufacturing method at the time of manufacturing an electrochemical device using the cladding | exterior_material with a cooling fin of FIG. 10 according to a process sequence, (A) is a folding | returning plan part (extension part for lower surface opening opening sealing) below The state which is going to accommodate the electrochemical device main-body part in the space between the folding | turning part folded back | folded and the housing | casing case of an exterior material is shown, (B) is exterior material after accommodating an electrochemical device main-body part. The state which obtained the electrochemical device by heat-sealing the peripheral part of is shown. It is sectional drawing which shows the electrochemical device comprised using the exterior material with a cooling fin of FIG. 10 (it is sectional drawing of WW in FIG. 11 (B)). It is a perspective view which shows other embodiment of the exterior material with the cooling fin for electrochemical devices which concerns on this invention. It is a perspective view which shows the manufacturing method at the time of manufacturing an electrochemical device using the cladding | exterior_material with a cooling fin of FIG. 13 in order of a process, (A) is the folding | turning plan part (lower surface opening | mouth sealing of a cladding | exterior_material with a cooling fin) The state in which the electrochemical device main body is to be stored in the space between the folded portion formed by folding back the extended portion) and the housing case of the exterior member with the cooling fin, (B) is the electrochemical device main body. After sealing, the sealing peripheral edges of the exterior material are heat-sealed. (C) shows the sealing peripheral edges on both the left and right sides bent to raise from a horizontal state to an upright state and superimposed on the side wall of the storage case. The state where the electrochemical device is obtained by bonding is shown. It is sectional drawing of EE in FIG.14 (C). It is sectional drawing of the battery (simulated product) which shows each temperature measurement position in the heat dissipation evaluation method.

  One embodiment of an exterior material with cooling fins for an electrochemical device according to the present invention is shown in FIG. The packaging material 1 with cooling fins for an electrochemical device is disposed between a heat-resistant resin stretched film layer 2 as an outer layer, a thermoplastic resin unstretched film layer 3 as an inner layer, and the two film layers 2 and 3. It consists of a laminated body containing the metal foil layer 4 made (refer FIG. 2).

  The exterior material 1 has a substantially rectangular parallelepiped shape, and forms a housing case 42 in which only one surface (the lower surface in FIGS. 1 and 2) is opened, and the lower surface opening 49 of the housing case 4. It is formed into a three-dimensional shape having a sealing peripheral edge 43 extending outward from the side in a substantially horizontal direction (see FIGS. 1 and 2).

  The storage case 42 is formed so as to protrude (expand) toward the outer layer 2 side of the laminate, and the exposed surface in the storage recess 42 a of the storage case 42 becomes the inner layer 3. (See FIG. 2).

  A plurality of fins 5 project upward from the surface on the outer layer 2 side of the sealing peripheral edge 43 extending from one of the four sides forming the lower surface opening 49 (see FIG. (See FIGS. 1 and 2). The plurality of fins 5 are spaced apart from each other (see FIGS. 1 and 2). The number of the fins (projections) 5 may be one.

  In the present embodiment, the plurality of fins 5 are arranged in parallel to each other. Further, the length direction (axial direction) of the fin 5 is substantially coincident (including coincidence) with the length direction of the sealing peripheral portion 43 provided with the fin 5 (see FIG. 1). The length direction (axial direction) of the fin 5 is the side on which the fin 5 is provided (one side on the side where the fin 5 is provided among the four sides forming the lower surface opening 49). And parallel.

  Moreover, in this embodiment, the fin is not formed in the surface of the said storage case 42 (refer FIG. 1).

  In the present embodiment, the fin 5 is formed in a projecting manner by partially folding a planar laminate including the outer layer 2, the inner layer 3 and the metal foil layer 4. (See the partially enlarged view of FIG. 2). Then, the inner layers 3, 3 overlapped by the folding process inside the fin 5 are fused and integrated by heating to form a welded joint 6, and such welded joints (inner layers) The welding state of the fins 5 does not eliminate the protruding state of the fins 5 (the fins 5 are not lost). Since the fins 5 are formed by partially folding such a planar laminate, the productivity is excellent. In the partial folding process, for example, in a state in which a folded part is partially formed by a human hand, the folded part is subjected to an apparatus (product number: TP-701-B) manufactured by Tester Sangyo Co., Ltd. This can be done by sequentially proceeding with the work of heat sealing and welding and integration using a slab, but this is only an example and is particularly limited to such methods and devices is not.

  In the present invention, the method of forming the fins 5 is not limited to the above partial folding process, and other methods may be adopted.

  In the packaging material 1 with cooling fins for electrochemical devices, one or more strips are formed on the surface on the outer layer 2 side in the sealing peripheral edge 43 extending from one of the four sides forming the lower surface opening 49. However, by providing the fin 5 on the sealing peripheral portion 43 on the side where the tabs 31 and 33 are arranged, the structure of the electrochemical device 20 can be improved. Heat generated around the tabs 31 and 33 can be efficiently radiated.

  Next, the manufacturing method of the said exterior member 1 with the cooling fin for electrochemical devices is demonstrated. First, a laminate including a heat-resistant resin stretched film layer 2 as an outer layer, a thermoplastic resin unstretched film layer 3 as an inner layer, and a metal foil layer 4 disposed between the film layers 2 and 3. The housing case 42 is formed by performing molding such as deep drawing and stretch molding on the laminate (see FIG. 3A). The housing case 42 has a substantially rectangular parallelepiped shape and is configured such that only one surface (the lower surface in FIG. 3) of the six surfaces is opened. That is, the lower case opening 49 is provided in the housing case 42 having a substantially rectangular parallelepiped shape.

  Next, by partially folding the planar portion 60 in FIG. 3A, one or a plurality of fins 5 project upward from the surface on the outer layer 2 side (FIG. 3B). )reference).

  Thereafter, the surplus portion 61 in FIG. 3B is cut and removed to obtain the exterior member 1 with cooling fins for an electrochemical device of the present invention (see FIG. 3C). The inner surface of the housing case 42 is the inner layer 3 of the exterior material 1, and the outer surface of the housing case 42 is the outer layer 2 of the exterior material 1 (see FIG. 2).

  Next, FIG. 4 shows a first embodiment of an electrochemical device 20 configured using the packaging material 1 with a cooling fin for electrochemical devices according to the present invention.

  The electrochemical device 20 in FIG. 4 includes a first exterior material made of the exterior material 1 with cooling fins, a second exterior material 51, and an electrochemical device body 10. The first exterior material 1 is configured to have fins 5 on the surface on the outer layer 2 side, whereas the second exterior material 51 is configured not to include fins on the surface. As shown in FIG. 5, a positive electrode tab 31, a positive electrode tab film 32, a negative electrode tab 33, and a negative electrode tab film 34 are attached to the electrochemical device main body 10.

  The second exterior material 51 includes a heat-resistant resin stretched film layer 2 as an outer layer, a thermoplastic resin unstretched film layer 3 as an inner layer, and a metal foil layer 4 disposed between these two film layers. It is the structure which includes (refer FIG. 7).

  Thus, as shown in FIG. 5, the electrochemical device 20 includes a first exterior material (exterior material with cooling fins) 1 and a second exterior material (exterior material without fins) 51 whose inner layers 3 face each other. The first exterior material 1 and the second exterior so that the electrochemical device body 10 is accommodated in the accommodation case 42 of the first exterior material 1 and the lower surface opening 49 of the first exterior material 1 is sealed. The material 51 is overlaid, and the inner layer 3 of the sealing peripheral portion 43 of the first exterior material 1 and the peripheral portion of the inner layer 3 of the second exterior material 51 are joined and sealed by heat sealing. . In FIG. 4, reference numeral 13 denotes a heat seal portion in which the inner layer 3 of the sealing peripheral portion 43 of the first exterior material 1 and the peripheral portion of the inner layer 3 of the second exterior material 51 are welded. FIG. 6 is a cross-sectional view showing a seal joining state at the heat seal portion 13. As shown in FIG. 6, no gap remains between the first exterior material 1 and the second exterior material 51 in the heat seal portion 13 at the periphery of both the exterior materials 1, 51, that is, the heat seal portion 13. In this case, there is no gap in the welded joint portion 14 between the inner layers 3, so that leakage of contents such as the electrolyte can be sufficiently prevented.

  In the electrochemical device 20 of FIG. 4, since the exterior material 1 with the cooling fin of the present invention is used as one exterior material, that is, the outer layer of the sealing peripheral portion 43 on the side where the tabs 31 and 33 are disposed. Since the fins 5 project from the surface on the second side, the heat generated around the tabs 31 and 33 of the electrochemical device 20 can be efficiently radiated.

  Further, in the electrochemical device 20, the sealing peripheral portion 43 (heat seal portion 13) on the side where the tabs 31 and 33 are arranged can be bent due to the presence of the tabs 31 and 33. Since this is not possible (see FIG. 4), the space on the outer layer 2 side of the sealing peripheral portion 43 (heat seal portion) on the side where the tabs 31 and 33 are arranged (one side on the side where the tabs in the housing case 42 are arranged). Conventionally, the space 90 just outside the side wall has been left as it is as a dead space (a wasteful space that is not effectively used) as it is, but the above-described structure configured using the exterior material 1 of the present invention. The electrochemical device 20 has a configuration in which one or a plurality of fins 5 are arranged in the dead space 90 (see FIG. 4). It is possible to radiate heat generated in the tab near 20 efficiently. Because dead space is effectively used in this way (because the volume of the electrochemical device is not newly increased), the heat from the electrochemical device is efficiently reduced without reducing the volumetric energy density of the electrochemical device. Heat can be released.

  Therefore, according to the electrochemical device 20 configured using the exterior material 1 of the present invention, even when used as a small electrochemical device (battery or the like) mounted on a mobile device or the like, Even when used as a large electrochemical device (battery or the like) mounted on an automobile or the like, the heat from the electrochemical device can be efficiently dissipated without reducing the volume energy density.

  Next, 2nd Embodiment of the electrochemical device 20 comprised using the exterior | packing material 1 with the cooling fin for electrochemical devices which concerns on this invention is shown in FIG.

  The electrochemical device 20 shown in FIG. 8 includes two exterior members 1 with cooling fins and an electrochemical device body 10. In the second embodiment, each of the pair of exterior materials 1 to be used has a configuration including fins 5. As shown in FIG. 9, a positive electrode tab 31, a positive electrode tab film 32, a negative electrode tab 33, and a negative electrode tab film 34 are attached to the electrochemical device main body 10.

  As shown in FIGS. 8 and 9, the electrochemical device 20 is arranged so that the two outer packaging materials 1 with cooling fins face each other so that the inner layers 3 face each other. The electrochemical device body 10 is disposed in a housing space formed by combining the housing recesses 42a and 42a of the housing cases 42 and 42, respectively, and sealing the two outer packaging materials 1 with cooling fins. The inner layers 3 of the peripheral edge portion 43 are sealed and sealed by heat sealing. In FIG. 8, reference numeral 13 denotes an inner layer 3 of the sealing peripheral portion 43 of the exterior member 1 with cooling fin disposed on the upper side, and a sealing peripheral portion 43 of the exterior member 1 with cooling fin disposed on the lower side. It is the heat seal part by which the inner layer 3 of this was welded.

  In the electrochemical device 20 of FIG. 8, since the exterior material 1 with the cooling fin of the present invention is used for both the upper and lower pair of exterior materials, the heat generation around the tabs 31 and 33 of the electrochemical device 20 is more efficient. Can dissipate heat.

  Further, in the electrochemical device 20, the sealing peripheral portion 43 (heat seal portion 13) on the side where the tabs 31 and 33 are arranged can be bent due to the presence of the tabs 31 and 33. Since this is not possible (see FIG. 8), the space on the outer layer 2 side of the sealing peripheral portion 43 (heat seal portion) on the side where the tabs 31 and 33 are disposed (one side on the side where the tabs in the housing case 42 are disposed). Conventionally, the space 90 just outside the side wall has been left as it is as a dead space (a wasteful space that is not effectively used) as it is, but the above-described structure configured using the exterior material 1 of the present invention. The electrochemical device 20 has a configuration in which one or a plurality of fins 5 are arranged in the dead space 90 (see FIG. 8). It is possible to radiate heat generated in the tab near 20 efficiently. Because dead space is effectively used in this way (because the volume of the electrochemical device is not newly increased), the heat from the electrochemical device is efficiently reduced without reducing the volumetric energy density of the electrochemical device. Heat can be released.

  Therefore, according to the electrochemical device 20 using the exterior material 1 of the present invention for both the upper and lower exterior materials, it is used as a small electrochemical device (battery or the like) mounted on a mobile device or the like. Even if it is used as a large-sized electrochemical device (battery etc.) mounted on an automobile, etc., the heat from the electrochemical device is efficiently dissipated without reducing the volume energy density. Can be made.

  Next, other embodiment of the exterior material 1 with the cooling fin for electrochemical devices which concerns on this invention is described. As shown in FIG. 10, the outer packaging material 1 with cooling fins for an electrochemical device includes a heat resistant resin stretched film layer 2 as an outer layer, a thermoplastic resin unstretched film layer 3 as an inner layer, and both of these films. It consists of a laminated body containing the metal foil layer 4 arrange | positioned between the layers 2 and 3. FIG. The exterior material 1 has a substantially rectangular parallelepiped shape, and includes a housing case 42 in which only one surface (the lower surface in FIG. 10) of the six surfaces is opened, and four sides forming a lower surface opening port 49 of the housing case 42. A sealing peripheral edge 43 extending outwardly in the substantially horizontal direction from three sides, and a lower surface opening opening sealing extension 44 extending from the remaining one of the four sides; (See FIG. 10). The inner surface of the housing case 42 is the inner layer 3 of the exterior material 1, and the outer surface of the housing case 42 is the outer layer 2 of the exterior material 1 (see FIG. 2).

  Further, a plurality of fins 5 project upward from the surface on the outer layer 2 side of the sealing peripheral edge 43 extending from one of the three sides (FIGS. 10 and 11). reference). The plurality of fins 5 are spaced apart from each other (see FIGS. 1 and 2). The number of the fins (projections) 5 may be one.

  In the present embodiment, the plurality of fins 5 are arranged in parallel to each other (see FIGS. 10 and 11). Further, the length direction (axial direction) of the fin 5 is substantially coincident with (including coincidence with) the length direction of the sealing peripheral portion 43 provided with the fin 5 (FIGS. 10 and 11). reference). The length direction (axial direction) of the fin 5 is the side on which the fin 5 is provided (one side on the side where the fin 5 is provided among the four sides forming the lower surface opening 49). (See FIGS. 10 and 11).

  Moreover, in this embodiment, the fin is not formed in the surface of the said storage case 42 (refer FIG. 10, FIG. 11).

  In the present embodiment, the fin 5 is formed in a projecting manner by partially folding a planar laminate including the outer layer 2, the inner layer 3 and the metal foil layer 4. (See the partially enlarged view of FIG. 10). Then, the inner layers 3, 3 overlapped by the folding process inside the fin 5 are fused and integrated by heating to form a welded joint 6, and such welded joints (inner layers) The welding state of the fins 5 does not eliminate the protruding state of the fins 5 (the fins 5 are not lost).

  FIG. 12 shows an electrochemical device 20 configured using the packaging material 1 with cooling fins for electrochemical devices shown in FIG. Moreover, FIG. 11 is the perspective view which showed the manufacturing method at the time of manufacturing the electrochemical device 20 using the cladding | exterior_material 1 with a cooling fin of FIG. 10 according to process order.

  First, as shown in FIG. 11 (A), the electrochemical device main body 10 is accommodated in the accommodating recess 42a of the accommodating case 42 of the exterior member 1 with the cooling fin, and at the planned folding portion in the exterior member 1 with the cooling fin. A certain lower surface opening closing extension 44 is folded downward to form a folded portion 45. Next, the inner layer 3 of the sealing peripheral portion 43 of the cooling finned exterior member 1 and the inner layer 3 of the peripheral portion of the folded portion 45 formed by folding down the lower surface open-port sealing extension 44. The lower surface opening 49 of the storage case 42 is sealed by overlapping. Thereafter, the inner layer 3 of the sealing peripheral portion 43 of the cooling finned exterior member 1 and the inner layer 3 of the peripheral portion of the folded portion 45 (folded sealing extension 44) of the cooling fin exterior member 1 Are heat-sealed (see FIG. 11B).

  As shown in FIG. 12, the electrochemical device 20 thus obtained has the electrochemical device main body 10 accommodated in the housing case 42 of the exterior member 1 with cooling fins, and the lower surface opening sealing of the exterior member 1 with cooling fins. The extension portion 44 is folded back, and the lower opening 49 of the housing case 42 is sealed by the folded sealing extension portion 44, and the inner layer of the sealing peripheral portion 43 of the exterior member 1 with the cooling fin is sealed. 3 and the inner layer 3 at the peripheral edge of the folded extension portion 44 of the sealing member 1 with the cooling fin are joined and sealed by heat sealing.

  In FIG. 12, reference numeral 13 denotes an inner layer 3 of the sealing peripheral portion 43 of the exterior member 1 with a cooling fin, and an inner layer 3 of the peripheral portion of the sealing extension portion 44 that is folded back and seals the lower surface opening 49. It is the heat-sealed part welded.

  Next, still another embodiment of the packaging material 1 with cooling fins for an electrochemical device according to the present invention will be described. The packaging material 1 with cooling fins for an electrochemical device is disposed between a heat-resistant resin stretched film layer 2 as an outer layer, a thermoplastic resin unstretched film layer 3 as an inner layer, and the two film layers 2 and 3. It consists of a laminated body containing the metal foil layer 4 made. As shown in FIG. 13, the exterior material 1 has a substantially rectangular parallelepiped shape, and a housing case 42 in which only one surface (the lower surface in FIG. 13) is opened, and a lower surface opening of the housing case 42. 49, the sealing peripheral edge 43 extending outwardly in the horizontal direction from three of the four sides forming 49, and the lower surface opening opening extended from the remaining one of the four sides And a blocking extension 44 (see FIG. 13). The inner surface of the housing case 42 is the inner layer 3 of the exterior material 1, and the outer surface of the housing case 42 is the outer layer 2 of the exterior material 1 (see FIG. 15).

  Further, the surface on the outer layer 2 side in the sealing peripheral edge 43 extended from one of the three sides (the side opposite to the side 72 on the side where the lower surface opening sealing portion 44 is provided). A plurality of fins 5 are provided so as to project upward (see FIGS. 13 and 14). The plurality of fins 5 are spaced apart from each other (see FIGS. 13 and 14). The number of the fins (projections) 5 may be one.

  In the present embodiment, the plurality of fins 5 are arranged in parallel to each other (see FIGS. 13 and 14). Further, the length direction (axial direction) of the fin 5 is substantially coincident (including coincidence) with the length direction of the sealing peripheral portion 43 provided with the fin 5 (FIGS. 13 and 14). reference). The length direction (axial direction) of the fin 5 is the side on which the fin 5 is provided (one side on the side where the fin 5 is provided among the four sides forming the lower surface opening 49). (See FIGS. 13 and 14).

  Moreover, in this embodiment, the fin is not formed in the surface of the said storage case 42 (refer FIG. 13, FIG. 14).

  In the present embodiment, the fin 5 is formed in a projecting manner by partially folding a planar laminate including the outer layer 2, the inner layer 3 and the metal foil layer 4. Is. Then, the inner layers 3, 3 overlapped by the folding process inside the fin 5 are fused and integrated by heating to form a welded joint 6, and such welded joints (inner layers) The welding state of the fins 5 does not eliminate the protruding state of the fins 5 (the fins 5 are not lost).

  Up to this point, the configuration is the same as the exterior material 1 with the cooling fin in FIG. In the exterior material 1 with a cooling fin in FIG. 13, the following configuration is further adopted. That is, as shown in FIG. 13, notches 7 are provided from the top to the bottom of the fin 5 at both ends in the longitudinal direction of the fin 5, and the position where the notch 7 is provided is the lower surface opening 49. Among the four sides that form the shape 5, the virtual extension lines of the sides (two parallel sides) 71 and 71 that are substantially orthogonal to the length direction of the fin 5 intersect the fin 5.

  FIG. 15 and FIG. 14 (C) show an electrochemical device 20 configured using the packaging material 1 with cooling fins for electrochemical devices shown in FIG. FIGS. 14A to 14C show a manufacturing method for manufacturing the electrochemical device 20 using the cooling fin-equipped packaging material 1 of FIG.

  A method for manufacturing the electrochemical device 20 shown in FIG. 15 will be described. First, as shown in FIG. 14 (A), the electrochemical device main body 10 is accommodated in the accommodating recess 42a of the accommodating case 42 of the exterior member 1 with cooling fins, and the folded portion in the exterior member 1 with cooling fins is used. A certain lower surface opening closing extension 44 is folded downward to form a folded portion 45. Next, the inner layer 3 of the sealing peripheral portion 43 of the cooling finned exterior member 1 and the inner layer 3 of the peripheral portion of the folded portion 45 formed by folding down the lower surface open-port sealing extension 44. The lower surface opening 49 of the storage case 42 is sealed by overlapping. Thereafter, the inner layer 3 of the sealing peripheral portion 43 of the cooling finned exterior member 1 and the inner layer 3 of the peripheral portion of the folded portion 45 (folded sealing extension 44) of the cooling fin exterior member 1 Are heat-sealed (see FIG. 14B).

  Next, the sealing peripheral portions 43 on both the left and right sides are formed along two sides (two parallel sides) 71 and 71 that are substantially orthogonal to the length direction of the fin 5 among the four sides that form the lower surface opening 49. It is bent and raised from a horizontal state to an upright state and overlapped and joined to the side wall 42Y of the housing case 42 (see FIG. 14C). At this time, since the notch 7 is provided at the specific position in the fin 5, the pair of left and right sealing peripheral portions 43 can be easily bent without any trouble, and the pair of sealing peripheral portions 43. Can be overlaid on the side wall 42Y of the housing case 42. That is, when the pair of right and left sealing peripheral portions 43 are bent at two parallel sides 71 and 71, as shown in FIG. 14C and FIG. The portion 5X of the fin 5 is disposed so as to enter a lateral gap (such as a gap between adjacent fins) of the central portion 5Z sandwiched between the cuts 7 on both ends of the fin 5, so that the pair of left and right sealing peripheral portions 43 can be easily folded without any trouble and superimposed on the side wall 42Y of the housing case 42. Thus, the electrochemical device 20 of the present invention can be obtained.

  In the electrochemical device 20 shown in FIG. 15 and FIG. 14C, the sealing peripheral portions 43 and 43 extending from the two sides 71 and 71 that are substantially orthogonal to the length direction of the fin 5 Since it is the structure overlapped and joined to the corresponding side wall 42Y, further space saving can be achieved, and there is an advantage that the volume energy density of the electrochemical device 20 can be further increased.

  In the above embodiment, a configuration in which a pair of sealing peripheral portions 43 bent along the two sides (two parallel sides) 71 and 71 are overlapped and joined to the side wall 42Y of the housing case 42 is employed. However, it may be joined to the side wall 42Y or may not be joined. Among them, it is preferable to adopt a joined configuration, and in this case, there is an advantage that the exterior material (the housing case 42) is hardly deformed.

  In the present invention, the height H of the fins 5 is preferably 0.5 mm or more and set to a thickness T or less of the electrochemical device main body 10 to be accommodated. When the height of the fin 5 is 0.5 mm or more, the heat generation around the tab of the electrochemical device can be radiated more efficiently. Moreover, since the height H of the fin 5 is set to be equal to or less than the thickness T of the electrochemical device main body 10 to be accommodated, the fin 5 can be accommodated in the dead space 90, and a new electrochemical operation is performed. Since the volume of the device is not increased, the volume energy density of the electrochemical device 20 is not decreased.

  Especially, it is especially preferable that the height H of the fin 5 is 1 mm or more and is set to a thickness T or less of the electrochemical device main body 10 to be accommodated.

  It is preferable that a plurality of the fins 5 are provided in the one outer packaging material 1 with a cooling fin. In this case, in the electrochemical device 20 configured using the packaging material 1 with cooling fins of the present invention, the heat dissipation rate can be further improved.

  Among these, it is more preferable that 2 to 5 (2 to 5) of the fins 5 are provided in the single cooling fin-equipped packaging material 1. By setting the number to 5 or less, the stress generated by forming the fins can be dispersed and reduced, so that heat can be transmitted uniformly during heat seal bonding between the inner layers of the exterior material, and heating is performed sufficiently. It is possible to sufficiently prevent a gap from being formed between the inner layers, thereby effectively dissipating heat to the outside when the electrochemical device generates heat. Moreover, by making it 5 or less, the complexity of a folding process can also be suppressed and productivity can be improved.

  In the case of adopting a configuration in which a plurality of fins 5 are provided in parallel in the single outer packaging material 1 with cooling fins, the spacing M between adjacent fins 5 is preferably set to 0.5 mm to 10 mm ( (See FIGS. 2 and 10).

  The thickness of the cooling fin-equipped exterior material 1 is preferably set to 0.05 mm to 0.3 mm. When the thickness is 0.05 mm or more, the thickness of the fin 5 can be sufficiently secured, and the heat around the tab of the electrochemical device can be sufficiently dissipated through the fin. The fins 5 can be easily formed by overlapping processing.

  In the exterior material 1 with cooling fins and the exterior material without ribs (second exterior material) 51, the laminated structure is preferably as follows. That is, the heat-resistant resin stretched film layer (outer layer) 2 is laminated and integrated on the upper surface of the metal foil layer 4 via a first adhesive layer (not shown), and the second surface on the lower surface of the metal foil layer 4. It is preferable to adopt a laminated structure in which the thermoplastic resin unstretched film layer (inner layer) 3 is laminated and integrated through an adhesive layer (not shown).

  The heat-resistant resin stretched film layer (outer layer) 2 is not particularly limited, and examples thereof include stretched polyamide films such as stretched nylon films and stretched polyester films. Among them, the heat resistant resin stretched film layer 2 includes a biaxially stretched polyamide film such as a biaxially stretched nylon film, a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, or a biaxially stretched film. It is particularly preferable to use a polyethylene naphthalate (PEN) film. The nylon film is not particularly limited, and examples thereof include 6 nylon film, 6,6 nylon film, MXD nylon film, and the like. The heat-resistant resin stretched film layer 2 may be formed as a single layer or, for example, a multilayer composed of a stretched polyester film / stretched polyamide film (a multilayer composed of a stretched PET film / stretched nylon film, etc.) ).

  The heat-resistant resin stretched film layer 2 preferably has a thickness of 9 μm to 50 μm. When using a stretched polyester film, the thickness is preferably 9 μm to 50 μm, and when using a stretched nylon film, the thickness is preferably 15 μm to 50 μm. By setting it above the preferred lower limit value, it is possible to ensure sufficient strength as the exterior material 1, 51, and by setting it below the preferred upper limit value, the weight energy density of the electrochemical device (battery etc.) is improved and the cost is reduced. Reduction can be realized.

  The thermoplastic resin unstretched film layer (inner layer) 3 has excellent chemical resistance against a highly corrosive electrolytic solution used in a lithium ion secondary battery or the like, and the exterior materials 1 and 51. It plays a role of imparting heat-sealing properties. Further, inside the fin 5, the inner layers 3, 3 superposed by the folding process can be welded and integrated by heating so that the inner layers 3, 3 can be joined without a gap (part of FIG. 2). See enlarged view).

  The thermoplastic resin unstretched film layer 3 is not particularly limited, but is at least one heat selected from the group consisting of polyethylene, polypropylene, olefin copolymers, acid-modified products thereof, and ionomers. It is preferably composed of an unstretched film made of a plastic resin.

  The thickness of the thermoplastic resin unstretched film layer (inner layer) 3 is preferably set to 0.02 mm to 0.1 mm. When the thickness is 0.02 mm or more, a gap remains in the welded joint portion 14 between the inner layers 3 in the heat seal portion 13 when the peripheral portions of the inner layer 3 of the exterior material 1 are heat sealed. Can be sufficiently prevented, and the leakage of the content liquid (electrolyte etc.) can be sufficiently prevented. Moreover, it can fully prevent that welding becomes inadequate by heat shortage by the heat insulation at the time of heat sealing because thickness is 0.1 mm or less. The thermoplastic resin unstretched film layer 3 may be a single layer or a multilayer.

  The metal foil layer 4 plays a role of imparting gas barrier properties to the exterior materials 1 and 51 to prevent entry of oxygen and moisture. Further, the metal foil layer 4 also plays a role of transferring heat generated in the electrochemical device to the fins 5 by utilizing a point that the metal has a high thermal conductivity.

  Although it does not specifically limit as said metal foil layer 4, For example, aluminum foil, copper foil, etc. are mentioned, Aluminum foil is generally used. Among these, it is preferable to use a hard aluminum foil. The thickness of the metal foil layer 4 is preferably 20 μm to 100 μm. When it is 20 μm or more, it is possible to prevent the occurrence of pinholes during rolling when manufacturing a metal foil, and when it is 100 μm or less, it is possible to improve the weight energy density of an electrochemical device (battery, etc.) and reduce the cost. .

The metal foil layer 4 is preferably subjected to chemical conversion treatment on at least the inner surface (the surface on the inner layer 3 side). By performing such a chemical conversion treatment, corrosion of the metal foil surface by the contents (battery electrolyte or the like) can be sufficiently prevented. For example, the metal foil is subjected to chemical conversion treatment by the following treatment. That is, for example, on the surface of the metal foil that has been degreased,
1) An aqueous solution of a mixture containing phosphoric acid, chromic acid, and at least one compound selected from the group consisting of a fluoride metal salt and a fluoride non-metal salt 2) phosphoric acid, an acrylic resin, An aqueous solution of a mixture comprising at least one resin selected from the group consisting of chitosan derivative resins and phenolic resins, and at least one compound selected from the group consisting of chromic acid and chromium (III) salts 3) phosphoric acid And at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins, at least one compound selected from the group consisting of chromic acid and chromium (III) salts, and fluoride Applying an aqueous solution of a mixture containing at least one compound selected from the group consisting of metal salts and nonmetal salts of fluorides, followed by drying. Subjected to a chemical conversion treatment by.

  Although it does not specifically limit as said 1st adhesive bond layer, For example, the adhesive bond layer etc. which were formed with the 2 liquid reaction type adhesive agent are mentioned. Examples of the two-component reactive adhesive include a first liquid composed of one or more polyols selected from the group consisting of polyurethane polyols, polyester polyols and polyether polyols, and a second liquid composed of isocyanate. And a two-component reactive adhesive composed of a liquid (curing agent). That is, when described by the type of adhesive after reaction, the first adhesive layer is not particularly limited. For example, a polyurethane adhesive layer, a polyester polyurethane adhesive layer, a polyether polyurethane adhesive layer, etc. Is mentioned. The first adhesive layer may be, for example, an adhesive such as the two-component reactive adhesive on the upper surface of the metal foil layer 4 and / or the lower surface of the stretched heat-resistant resin film layer 2 by a gravure coating method or the like. It is formed by applying by the above method.

  The second adhesive layer is not particularly limited. For example, a polyurethane adhesive, an acrylic adhesive, an epoxy adhesive, a polyolefin adhesive, an elastomer adhesive, a fluorine adhesive, and the like. The adhesive layer formed by (1) is mentioned. Among them, it is preferable to use an acrylic adhesive or a polyolefin adhesive. In this case, the electrolytic solution resistance and the water vapor barrier property of the exterior materials 1 and 51 can be improved.

  In addition, in the said embodiment, although the structure which provided the 1st adhesive bond layer and the 2nd adhesive bond layer is employ | adopted, neither of these layers is an essential structure layer, and the structure which does not provide these is employ | adopted. You can also

  The electrochemical device body 10 is not particularly limited, and examples thereof include a battery body, a capacitor body, and a capacitor body. The electrochemical device main body 10 preferably has a thickness T of 0.5 mm to 20 mm.

  The width of the heat seal portion 13 is preferably set to 0.5 mm or more. Sealing can be reliably performed by setting it as 0.5 mm or more. Especially, it is preferable to set the width | variety of the said heat seal part 13 to 1 mm or more and the thickness T or less of the electrochemical device main-body part 10 of the accommodation object.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
A stretched nylon film (outer layer) 2 having a thickness of 25 μm is bonded to one surface of a soft aluminum foil 4 defined by JIS H4160 having a thickness of 40 μm via a polyester-urethane adhesive (two-component curing type). Then, an unstretched polypropylene film (inner layer) 3 having a thickness of 40 μm is bonded to the other surface of the soft aluminum foil 4 via a polyolefin adhesive (two-component curing type), and then placed in a constant temperature bath at 40 ° C. Two laminates obtained by performing curing for 3 days were prepared.

  Next, as shown in FIG. 3 (A), a solid body having a housing case 42 having a substantially rectangular parallelepiped shape with a length of 54 mm, a width of 33 mm and a depth of 4 mm is formed by deep drawing one of the laminated bodies. After being formed into a shape, a portion (planar portion) extended long from one of the four sides forming the lower surface opening of the housing case 42 (the diagonally lower left side in FIG. 3A) ) 60 is folded from a position 1 mm away from the one side using a heat sealer manufactured by Tester Sangyo Co., Ltd., so that three strips are formed on the surface on the outer layer 2 side as shown in FIG. (Three pieces) of fins 5 (height H is 4 mm) are formed in a projecting manner in parallel with an interval M (at intervals of 1 mm). Next, the surplus portion 61 in FIG. 3 (B) is cut and removed by trimming, and the width of the sealing peripheral portion 43 is set to 4 mm over the entire circumference as shown in FIG. 3 (C). Attached exterior material (first exterior material; length 62 mm × width 41 mm) 1 was obtained. In the obtained packaging material 1 with cooling fins, the length direction of the fins 5 is substantially parallel to the length direction of the sealing peripheral edge portion 43 where the fins 5 are formed. That is, the length direction of the fin 5 is substantially orthogonal to the width direction of the sealing peripheral edge 43 where the fin 5 is formed.

  Further, the other laminate was punched into a size of 62 mm in length and 41 mm in width to obtain a finless exterior material (second exterior material) 51 (see FIG. 5).

  Next, a polypropylene film having a thickness of 30 μm, a soft aluminum foil having a thickness of 30 μm, a polypropylene film having a thickness of 30 μm, and a soft copper foil having a thickness of 30 μm are layered in this order to form a size of 52 mm in length × 31 mm in width. A dummy product of the battery main body (electrochemical device main body) 10 was prepared by stacking 30 sheets of punched ones as a unit (see FIG. 5).

  Next, a simulated product of the battery main body portion 10 is placed in the housing recess 42a of the housing case 42 of the exterior material 1 with cooling fins, and the exterior material with cooling fins (first exterior material) 1 and the fins are not present. After superposing the exterior material (second exterior material) 51 so that the inner layers 3 face each other, the other 3 sides excluding the lateral side of the 4 sides are used at a temperature of 200 ° C. using a 10 mm wide hot plate. Then, heat sealing was performed at 0.3 MPa for 2 seconds to form a heat sealing portion 13 having a width of 4 mm, and an exterior case having one side opened was created.

Next, an electrolytic solution (ethylene carbonate: dimethylene carbonate: dimethyl carbonate is mixed at a volume ratio of 1: 1: 1, using a syringe through the open lateral side inside the outer case. 5 mL of an electrolyte solution having a LiPF ₆ concentration of 1 mol / L obtained by adding LiPF ₆ to the mixed carbonate was added, and then the outer case was opened in a reduced pressure of 0.086 MPa. Sealing was performed by heat-sealing the sides with a metal hot plate heated to 200 ° C. for 2 seconds.

  Thereafter, the positions on both ends of the three (three) fins 5 (of the four sides forming the lower surface opening 49, the two virtual extension lines on two sides substantially perpendicular to the length direction of the fin 5; A cut 7 was provided using a cutter knife from the top to the bottom of the fin 5 (position where the fin 5 intersects) (reference diagram; FIG. 14B).

  Next, the sealing peripheral edge 43 extending from two sides substantially orthogonal to the length direction of the fin 5 among the four sides forming the lower surface opening 49 is bent (raised), and each of the housing cases 42 is folded. A battery (simulated product) was obtained by overlapping and joining the side walls.

<Example 2>
A battery (simulated product) was obtained in the same manner as in Example 1 except that the height H of the fin 5 was set to 0.5 mm. The number of fins 5 formed is three (three) as in the first embodiment.

<Example 3>
A battery (simulated product) was obtained in the same manner as in Example 1 except that the number of fins 5 formed was 1 (one). The height H of the fin 5 is 4 mm as in the first embodiment.

<Comparative Example 1>
A battery (simulated product) was obtained in the same manner as in Example 1 except that the finless exterior material 51 used in Example 1 was used instead of the cooling find exterior material (first exterior material) 1. That is, in this comparative example 1, the finless exterior material 51 was used as the pair of upper and lower exterior materials. Therefore, in the electrochemical device of Comparative Example 1, no fin is provided in the outer case formed of the upper and lower pair of outer packaging materials.

  Each battery (simulated product) obtained as described above was evaluated for heat dissipation based on the following test method. The results are shown in Table 1.

<Heat dissipation evaluation method>
Three samples were prepared for each example and comparative example, and one sample was placed in each of 40 ° C., 60 ° C., and 80 ° C. for 1 hour. After elapse of time, samples were taken out from each thermostat and left in an environment at room temperature of 21 ° C., and then after 15 minutes and 30 minutes, the first measurement position (position indicated by 101 in FIG. ), Temperature measurement was performed at the second measurement position (position indicated by 102 in FIG. 16) and the third measurement position (position indicated by 103 in FIG. 16). These temperature measurement results are shown in Table 1.
Cooling rate (° C./min)={(temperature after 15 minutes) − (temperature after 30 minutes)} ÷ 15
The cooling rate (° C./min) at each measurement position was determined by the above formula. In Comparative Example 1, the fin was not provided, but the temperature was measured in the same manner at the measurement positions 101, 102, and 103 shown in FIG.

  As is clear from Table 1, from the comparison results under the same temperature conditions, in the batteries of Examples 1 to 3 using the exterior material with cooling fins according to the present invention, the comparison using the exterior material having no fins was made. Compared with the battery of Example 1, the cooling rate (heat dissipation rate) was large, and the cooling effect by providing the fins was recognized. It can also be seen that the cooling rate is the highest at the “second measurement position” where the fins are provided.

  In particular, in Example 1 where the height of the fin is equivalent to the thickness (4 mm) of the electrochemical device main body 10 to be accommodated and the number of fins formed is plural, the height of the fin is 0.5 mm. It can be seen that the cooling rate (heat radiation rate) is larger than Example 2 and Example 3 in which the number of fins formed is one. Also, the higher the temperature of the electrochemical device, the greater the cooling rate.

  The packaging material with cooling fins for electrochemical devices of the present invention is suitably used as, for example, a packaging material for batteries and a packaging material for capacitors, but is not particularly limited to such applications.

The electrochemical device according to the present invention is, for example,
1) Lithium polymer batteries, lithium ion batteries, lithium ion capacitors, electric double layer capacitors used for mobile devices such as smartphones and tablets 2) Power sources for hybrid cars, electric cars, etc. 3) Wind power generation, solar power generation, nighttime electricity However, it is not particularly limited to such applications.

1 ... Exterior material with cooling fins for electrochemical devices (first exterior material)
2 ... Heat-resistant resin stretched film layer (outer layer)
3 ... Unstretched thermoplastic resin film layer (inner layer)
4 ... Metal foil layer 5 ... Fin (projection)
6 ... Welded joint 7 between inner layers in the fin 7 ... Cut (slit)
DESCRIPTION OF SYMBOLS 10 ... Electrochemical device main-body part 13 ... Heat seal part 14 ... Welding junction part (joining interface) of inner layers in a heat seal part
DESCRIPTION OF SYMBOLS 20 ... Electrochemical device 42 ... Accommodating case 42a ... Accommodating concave part 42Y ... Side wall 43 ... Sealing peripheral part 44 ... Underside opening opening sealing part 49 ... Underside opening 51 ... Second exterior material (finless exterior material)
90 ... dead space

Claims (12)

In an exterior device for electrochemical devices, including a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between these two film layers,
The exterior material includes a storage case having a substantially rectangular parallelepiped shape with an open lower surface, and a sealing peripheral edge extending outward in a substantially horizontal direction from four sides forming a lower surface opening of the storage case. Formed into a three-dimensional shape having
One or a plurality of fins project upwardly from the surface on the outer layer side of the sealing peripheral edge extending from one of the four sides forming the lower surface opening. An exterior material with cooling fins for electrochemical devices.   2. The cooling for an electrochemical device according to claim 1, wherein the fin is protruded on a surface on the outer layer side of the peripheral edge for sealing extended from one side on the side where the tab is arranged among the four sides. Finned exterior material. In an exterior device for electrochemical devices, including a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between these two film layers,
The outer packaging material is a substantially rectangular parallelepiped storage case whose bottom surface is open and a seal extending from the three sides of the four sides forming the lower surface opening of the storage case to the outside in a substantially horizontal direction. A peripheral edge for stopping, and an extension part for closing the lower surface opening that extends from the remaining one of the four sides,
One or more fins projecting upward on the surface on the outer layer side of the sealing peripheral edge extending from one of the three sides, for an electrochemical device Exterior material with cooling fins.   The cooling for an electrochemical device according to claim 3, wherein the fin protrudes from the surface on the outer layer side of the peripheral edge portion for sealing extended from one side on the side where the tab is arranged among the three sides. Finned exterior material.   The cooling for an electrochemical device according to any one of claims 1 to 4, wherein a height of the fin is 0.5 mm or more and not more than a thickness of an electrochemical device to be accommodated. Finned exterior material. The fin is projectingly formed by partially folding a laminated material including the outer layer, the inner layer, and the metal foil layer,
The exterior material with a cooling fin for an electrochemical device according to any one of claims 1 to 5, wherein inner layers overlapped by the folding process inside the fin are welded and joined.   The packaging material with cooling fins for electrochemical devices according to claim 6, wherein the packaging material has a thickness of 0.05 mm to 0.3 mm. The length direction of the fin substantially coincides with the length direction of the sealing peripheral portion provided with the fin,
Cuts are provided from the top to the bottom of the fin on both ends in the length direction of the fin, and the positions where the cuts are provided are the two sides of the four sides that are substantially orthogonal to the length direction of the fin. The packaging material with a cooling fin for an electrochemical device according to any one of claims 1 to 7, wherein the virtual extension line and the fin intersect with each other. A first exterior material comprising the exterior material with cooling fin according to claim 1 or 2,
A second exterior material comprising a heat-resistant resin stretched film layer as an outer layer, a thermoplastic resin unstretched film layer as an inner layer, and a metal foil layer disposed between these two film layers;
An electrochemical device body, and
The second exterior material has no fins on the surface,
The electrochemical device main body is accommodated in the housing case of the first exterior material, and the first exterior material and the second exterior material are overlapped so as to seal the lower surface opening of the first exterior material, An electrochemical device, wherein an inner layer of a sealing peripheral portion of the first exterior material and a peripheral portion of an inner layer of the second exterior material are joined and sealed. Two exterior materials with cooling fins according to claim 1 or 2,
An electrochemical device body, and
The two outer packaging materials with cooling fins are arranged so that the inner layers face each other, and the housing recesses of the respective housing cases of the two outer packaging materials with cooling fins are combined to form the housing space. The electrochemical device body is located,
An electrochemical device characterized in that the inner layers of the sealing peripheral portions of the two outer packaging materials with cooling fins are joined and sealed. One exterior material with a cooling fin according to claim 3 or 4,
An electrochemical device body, and
The electrochemical device main body is accommodated in the housing case of the exterior material with cooling fins, and the extension portion for closing the lower surface opening of the exterior material with cooling fin is folded, and the folded extension portion for sealing The lower surface opening of the housing case is sealed, and the inner layer of the sealing peripheral portion of the exterior member with cooling fin is joined to the inner layer of the peripheral portion of the folded extension portion of the sealing member with cooling fin. An electrochemical device characterized by being sealed. The length direction of the fin substantially coincides with the length direction of the sealing peripheral portion provided with the fin,
Cuts are provided from the top to the bottom of the fin at both ends in the length direction of the fin, and the positions where the cuts are provided are two sides of the four sides that are substantially orthogonal to the length direction of the fin. It is the position where each virtual extension line and the fin intersect,
Sealing peripheral portions extending from two sides substantially orthogonal to the length direction of the fin among the four sides are overlapped and joined to corresponding side walls of the housing case, respectively. The electrochemical device according to any one of claims 9 to 11.

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