JP4890795B2 - Film exterior battery and assembled battery in which it is assembled - Google Patents

Description

  The present invention relates to a film-clad battery in which battery elements are housed together with an electrolyte in a sealed space formed by a laminate film or the like, and an assembled battery in which the battery elements are assembled.

  In recent years, for example, a lightweight and small battery has been developed as a power source for driving a motor of an electric vehicle. As this type of battery, for example, an assembled battery in which a plurality of battery cells 420A (also referred to as film-clad batteries) as shown in FIG. 11 are assembled is known. The battery cell 420A has a battery element 422 arranged in a sealed space formed by the exterior film 424, and the battery element 422 itself is formed by alternately laminating positive and negative electrode metal foils via separators. It has been configured. The battery element 422 is accommodated in the exterior film 424 together with the electrolytic solution, whereby a predetermined electromotive force is output through each electrode tab 425. This type of battery cell 420A may be used in a cell case made of, for example, a resin molded product.

  By the way, in the battery cell having such a configuration, in order to increase the capacity of the battery, for example, as shown in FIG. 12, two battery elements 422a and 422b may be stacked in two stages. That is, the battery cell 420B in FIG. 12 has two battery elements 422a and 422b, thereby obtaining an output twice that of the battery cell 420A in FIG.

  However, the battery element 422 has a property of generating heat during use, and it is necessary to dissipate the generated heat from the viewpoint of preventing the battery from being shortened and not deteriorating the battery performance. Therefore, especially in the configuration as shown in FIG. 12, heat is trapped inside the battery elements 422a and 422b, which is considered to be problematic for practical use.

  FIG. 13 schematically shows a configuration of a conventional assembled battery disclosed in Patent Document 1. As shown in FIG. 13, the assembled battery 550 has a plurality of battery cells BC assembled in a stacked state, and each battery cell BC is electrically connected in a parallel connection state. In order to prevent the temperature rise of the battery cell BC, the heat radiating means (anode plate 530) as shown in FIG. 14 is accommodated in the center battery cell BC in the figure.

Specifically, the anode plate 530 has a circulation channel 523 formed between two plates 521 and 522, and the circulation channel is filled with, for example, pure water as a working fluid, Thereby, it functions as a heat pipe. The heat pipe type anode plate 530 receives the heat from the battery element in the battery cell BC so that the temperature of the working fluid rises. As a result, the working fluid circulates gently. It will be. This circulation radiates the battery cells.
JP-A-9-50821

  As described above, when battery cells or assembled batteries are used, it is desirable to efficiently dissipate the battery cells. On the other hand, although it is considered that the heat dissipation means as shown in FIG. 14 can surely provide efficient heat dissipation, the cooling means having a complicated structure as shown in FIG. 14 is incorporated in the battery cell or the assembled battery. This is not preferable, for example, due to manufacturing costs. In addition, the working fluid in the circulation channel may leak into the battery cell BC, and the battery cell BC may break down due to leakage of the working fluid.

  Further, in order to increase the capacity of the battery cell, in addition to the configuration shown in FIG. 12, for example, as shown in FIG. 15, the area of the battery cell 420C is increased to obtain an output twice that of the battery cell 420A. It is also possible to do so. However, actually, in many cases, the area of the battery cell cannot be increased due to the outer size required for the assembled battery. In addition, the battery cell itself is generally configured to be thin, and thus there is a problem that the surface rigidity of the battery cell 420C is reduced when the area is increased as shown in FIG.

  The present invention has been made in view of the above-described problems, and the object thereof is to satisfactorily dissipate the internal battery elements even when the capacity of the film-clad battery is increased. Another object of the present invention is to provide a film-clad battery capable of sufficiently ensuring the rigidity of the battery as a whole, and an assembled battery in which the film is assembled.

  In order to achieve the above object, a film-clad battery according to the present invention includes a tubular member having a flat cylindrical shape, and a passage forming member provided with side edge members provided at both ends in the axial direction of the cylindrical member, and the cylindrical shape. Two battery elements respectively disposed on both surfaces of the member, and two exterior films surrounding and sealing the two battery elements, and formed on the side edge member inside the cylindrical member The cooling air is supplied through the passage, and two sides of the outer peripheral portion of the exterior film are attached to a part of each side edge member, and the other two At the side, the exterior films are heat-sealed with each other, whereby the exterior films are two-dimensionally folded.

  According to the film-clad battery configured as described above, since the battery element is provided, the capacity of the battery is increased. Further, since the cooling air can be supplied to the inside of the cylindrical member sandwiched between the battery elements, it is possible to dissipate the heat of each battery element, and therefore, between the battery elements. There is no heat. Further, since the cylindrical member also functions as a reinforcing member, the rigidity of the entire battery is sufficiently ensured. Furthermore, since the exterior film is two-dimensionally bent along a part of the side edge member, it is not necessary to provide a three-dimensional structure portion (for example, a cup portion) or the like on the film. This will be described in detail in [Best Mode for Carrying Out the Invention].

  In the present invention, the side edge member has a film sticking portion whose outer peripheral surface is the part to which the exterior film is stuck, and the height dimension of the film sticking portion is the thickness of the two battery elements. It is preferable that the thickness is set to be equal to or larger than the thickness of the passage forming member. Moreover, the outline shape of this film sticking part is made into the hexagon, and the said exterior films may be mutually heat-sealed in the acute angle corner part in this hexagon.

  More specifically, the side edge member has a side wall that extends along one side of the battery element on the outer side of the film sticking portion, and both ends of the side wall are respectively the outer peripheral film. It extends to the outside from both ends. It is preferable that each battery element is arranged in a state where one surface thereof is in close contact with one surface of the cylindrical member so that heat from the battery element is transmitted to the cylindrical member satisfactorily. The inside of the cylindrical member may be a plurality of cooling air passages partitioned by ribs.

  In order to cope with the problem of gas generation in the film-clad battery, it is preferable that the cylindrical member has a safety valve on at least one of the both surfaces. The safety valve is a thin wall portion that is torn when the pressure of the gas generated in the exterior film exceeds a predetermined set value. The film-clad battery of the present invention further includes a sheet-like electrode tab that is electrically connected to each of the battery elements and drawn out from a portion where the exterior films are heat-sealed. In this case, it is preferable that one end side of the electrode tab is supported by the passage forming member.

  The passage forming member may be a resin molded product in which the cylindrical member and the side edge member are integrally formed. Alternatively, the cylindrical member is made of a metal material, and the cylindrical member You may be insulated by the film affixed on the outer peripheral surface.

  As described above, according to the present invention, even when the capacity of the battery is increased by providing two battery elements, a cooling air passage formed by the cylindrical member is formed between the battery elements. Therefore, heat dissipation of the battery element can be performed satisfactorily. In addition, since the cylindrical member also functions as a reinforcing member, the rigidity of the entire battery is sufficiently ensured. Furthermore, since the exterior film is in a two-dimensional folded form, there is no need to provide a three-dimensional structure on the film, which means, for example, simplification of the manufacturing process.

Hereinafter, embodiments of the film-clad battery of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is an external perspective view showing the configuration of the battery cell of this embodiment, and FIG. 2 is a top view of the battery cell of FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a perspective view showing the passage forming member used in the battery cell of this embodiment in a single state.

  As shown in FIGS. 1 to 3, the battery cell 50 of this embodiment includes two battery elements 22 </ b> A and 22 </ b> B each configured to output a predetermined electromotive force (e.g., 3.6 V), and a battery element. A passage forming member 30 that forms a cooling air passage for cooling, and two exterior films 24A and 24B (also simply referred to as exterior films 24) that surround and seal the two battery elements 22A and 22B. ing.

  Both battery elements 22A and 22B are obtained by alternately laminating positive and negative electrode metal foils via separators, and have a rectangular parallelepiped outer shape. The thickness of the battery elements 22A and 22B is, for example, about several mm to several tens of mm. As schematically shown in FIG. 3, each metal foil for the positive electrode of each battery element is connected to the electrode tab 25a, and each metal foil for the negative electrode of each battery element is connected to the electrode tab 25b. It has come to be.

  In the battery cell 50 of the present embodiment configured as described above, the two battery elements 22A and 22B are provided, so that one battery cell is equivalent to two battery elements (3.6V × 2 = 7.2V). ) Output.

  The passage forming member 30 is a resin molded product, and as shown in FIG. 4, a cylindrical portion 35 having a flat cylindrical shape and two side edges provided at both ends in the axial direction (Y direction in the drawing) of the cylindrical portion. It is divided roughly into the part 38. The passage forming member 30 may be a single member formed as a whole, or the tubular portion 35 and the passage forming member 30 that are configured separately are integrally assembled. There may be.

  A plurality of cooling air passages 32 partitioned by ribs are formed inside the cylindrical portion 35 (see FIG. 4B). The height of the cooling air passage 32 is not particularly limited, but may be about 1 to 2 mm, for example. In addition, although it is also possible to set it as one cooling air path without providing a rib, the rigidity of the cylindrical part 35 is ensured by providing a rib like this embodiment.

  Both the upper surface 35a and the lower surface 35b of the cylindrical part 35 are planes, and are formed in parallel to each other. Thus, by making the upper surface 35a and the lower surface 35b flat, each surface 35a, 35b and one surface of battery element 22A, 22B will be in surface contact, and, thereby, the heat from a battery element is a cylindrical part. It is designed to communicate well.

  A plurality of passages 32 ′ extending from the cooling air passages 32 of the cylindrical portion are formed in the side edge portion 38, and the cooling air can be sent into the cooling air passage 32 through the passages 32 ′. ing. When the side edge portion 38 is divided more finely, the side edge portion 38 is composed of a film sticking portion 38A located on the cylindrical portion 35 side and a side wall 38B located on the outside thereof.

38 A of film sticking parts have a hexagonal outline shape seeing from the Y direction shown in figure, and an exterior film is stuck on the outer peripheral surface (it shows by hatching). The height dimension H ₃₈ of the film pasting portion 38A is set to be equal to or larger than the dimension H ₂₂ (see FIG. 3) obtained by adding the thickness of the cylindrical portion 35 to the thickness of two battery elements. In addition, in FIG. 4, although the height dimension of 38 A of film sticking parts and the height dimension of a side wall are drawn, it is not limited to this. For example, if the height dimension of the side wall 38B is slightly increased (that is, if the upper surface of the film pasting portion 38A is made one step lower), the upper surface of the pasted film is made the same as the upper surface of the side wall 38B, Alternatively, it can be lowered.

  The side wall 38B extends in the X direction in the figure, and one through hole 41 is provided at each end thereof. A plurality of battery cells 50 can be fixed by inserting a bolt through the through hole 41. Since the side wall 38B is configured as shown in FIG. 4, the side wall 38B can be used as a cell case. Therefore, according to the battery cell of this embodiment, it is not necessary to prepare a special cell case. That is, in view of the fact that the side wall 38B also functions as a cell case, it is preferable that both ends (the X direction in the drawing) of the side wall surface 38B extend outward from both ends of the outer peripheral film 24 as shown in FIG. .

  In the completed state of the battery cell 50, as shown in FIG. 2, the four sides of the outer peripheral portion of the exterior film 24 become sealing portions. This sealing part 23 is comprised by sealing part 23a, 23b, and the inner surface of the exterior film 24 is adhere | attached on 38 A of film sticking parts in the sealing part 23a. In the sealing part 23b, the inner surfaces of the facing exterior films are heat-sealed with each other, and the electrode tabs 25a and 25b are drawn out therefrom. In the present embodiment, the two films are heat-sealed at an acute angle portion on the outer peripheral surface of the film pasting portion 38A, and the films are not bent at a steep angle. The seal part is well formed.

  The adhesion of the exterior films 24A and 24B may be performed while evacuating, whereby the sealed space in the exterior film is depressurized and the exterior film adheres to the outer peripheral surface (surface) of the battery element. Will be. Further, the adhesion between the exterior film 24 and the film pasting portion 38A may be made by, for example, heat-sealing the inner side surface of the exterior film with respect to the outer peripheral surface of the film pasting portion 38A, Alternatively, both members may be bonded using an adhesive.

  By the way, in this type of conventional film-clad battery, as shown in FIG. 5, the cup part 60 is often formed on the exterior film, and the corner film 65 is processed in a three-dimensional manner. It has become. The corner 65 is formed at a position corresponding to the corner of the battery element (not shown), and the corner of the battery element and the corner 65 of the film interfere with each other, so that the inner surface of the corner may be damaged in some cases. There was also a possibility to do. In addition, in order to obtain such a three-dimensional corner 65, it is necessary to form a cup using, for example, a press die.

  On the other hand, in the battery cell 50 of the present embodiment, as shown in FIG. 1, the exterior film 24 is simply two-dimensionally bent along the outer peripheral surface of the film attaching portion 38 </ b> A. The corner | angular part 65 like is not produced. Therefore, the problem that the film is damaged at the corner 65 does not occur. Moreover, when it becomes the structure of two-dimensional bending in this way, it is also possible to adhere | attach an exterior film by the following processes, for example. That is, a flat exterior film in which no cup portion is formed is placed at a predetermined position of the passage forming member 30, and then a portion to be the sealing portion 23 is pressed by a heat sealing jig. Thereby, the sealing part 23 is formed and the exterior film is bent at the same time. Of course, heat sealing can be performed after the outer film has been creased in advance, but according to the above method, there is an advantage that the process is simplified.

  As described above, according to the battery 50 of the present embodiment, since the two battery elements 22A and 22B are provided in one film package, a large battery cell as described with reference to FIG. It is possible to increase the capacity of the battery without increasing the area. And even if it is the structure which laminates | stacks a battery element in this way, since the cylindrical part 35 is arrange | positioned between battery element 22A, 22B, the following advantages are acquired.

  That is, the heat generated in the battery elements 22A and 22B when the battery cell 50 is used (during charging / discharging) propagates to the upper surface 35a or the lower surface 35b of the cylindrical portion. Thereby, the temperature of the cylindrical part 35 rises. The heat transmitted to the cylindrical portion 35 is transferred to the air in the cooling air passage 32 and released to the outside. Thus, in the battery cell 50 of this embodiment, since the heat generated in each battery element can be released through the cooling air passage 32, the heat dissipation of each battery element is performed satisfactorily. Further, the battery cell 50 of this embodiment does not use the heat dissipation means having a complicated structure as described with reference to FIG. 14, but performs heat dissipation using the passage forming member 30 having a relatively simple structure. Therefore, it is advantageous from the viewpoint of manufacturing cost and reliability, for example.

  Further, the cylindrical portion 35 also has a function as a reinforcing member in the battery cell 50. Usually, the battery elements 22A and 22B themselves have a flat structure of, for example, about several mm to several tens of mm as described above, and may be deformed when an external force is applied. The deformation of the battery elements 22A and 22B itself may cause a short circuit between the positive electrode metal foil and the negative electrode metal foil, for example. On the other hand, if the cylindrical part 35 is arrange | positioned between battery elements like this embodiment, the surface rigidity of the battery cell 50 will improve and generation | occurrence | production of deformation | transformation of battery element 22A, 22B will occur. Is prevented.

  FIG. 6 shows an assembled battery 80 in which a plurality of battery cells 50 according to this embodiment are assembled and electrically connected in series. As shown in the drawing, since a part of the passage forming member 30 of each battery cell 50 also functions as a cell case, the assembled battery 80 can be configured only by stacking the battery cells 50 together. Each battery cell is fixed by a through bolt (not shown) passed through each through hole 41. In each battery cell 50, the member of the passage forming member 30 does not exist in the portion where the electrode tabs 25a and 25b are drawn. Therefore, the support of the electrode tabs 25a and 25b is stabilized by arranging the tab support member 81 made of, for example, urethane foam at this portion.

  Although not particularly described in the above description, the refrigerant flowing through the cooling air passage 32 is not limited to air, and various refrigerants including liquid can be used. Further, the exterior films 24A and 24B are, for example, laminate films, and those capable of satisfactorily hermetically sealing battery elements are used as the laminate films. As a specific example, a resin layer that is heat-meltable and that is an inner surface, a non-venting layer that is made of a metal thin film, and a protective layer that is made of nylon and that is an outer surface are laminated in this order. It may be.

(Second Embodiment)
The passage forming member may be, for example, as shown in FIG. 7 other than those shown in the above embodiment. FIG. 7 is a perspective view of the passage forming member 130 used in the battery cell of the second embodiment, and shows only the cylindrical portion 135 that is the central portion. 8 is a partial cross-sectional view taken along the line BB in FIG. In addition, although the whole structure is not illustrated, the battery cell of this embodiment is provided with the channel | path formation member 130 instead of the channel | path formation member 30 in the battery cell 50 of 1st Embodiment. Since the components other than the passage forming member are the same as those in the first embodiment, the description thereof is omitted.

  By the way, in a film-clad battery, for example, when a voltage outside the standard range is applied to the battery when the battery is used, the electrolyzed solvent encapsulated with the battery element is electrolyzed, and as a result, gas is generated in the exterior film. There are things to do. In addition, even when the battery is used under high temperature conditions outside the standard range, gas may be generated due to decomposition of the electrolyte salt or the like. When a large amount of gas is generated and the internal pressure in the exterior film reaches a certain pressure, the sealing portion of the exterior film may be peeled off. In this case, it is difficult to predict where the separation occurs, and if the gas is ejected from an unexpected location, there is a possibility that other adjacent battery cells may be damaged.

  Therefore, in the present embodiment, in order to solve such a problem of gas ejection, a safety valve 140 is provided approximately at the center of the upper surface 135a of the cylindrical portion 135 as shown in FIG. As shown in FIG. 8, the safety valve 140 is a structural part in which the thickness of the upper surface 135a is partially reduced. The thin portion is torn when the internal pressure in the exterior film exceeds a predetermined set pressure (for example, 0.05 to 1 MPa as an increase from the atmospheric pressure). Thereby, the sealed space in the exterior film and the cooling air passage 132 (gas discharge passage) communicate with each other, and the gas is discharged to the outside through the cooling air passage 132.

  According to the battery cell of the present embodiment configured as described above, in addition to the same advantages as those of the first embodiment, since the safety valve 140 is provided, problems caused by gas are less likely to occur. Further, as in the present embodiment, it is preferable that the passage forming member 130 has the function of the safety valve 140 because a special member for configuring the safety valve is not required.

  The cooling air passage 132 in FIG. 7 functions as a gas discharge path when the safety valve is broken, but it can also function as a normal cooling air passage until the safety valve is broken. In order to detect that the gas has been released, for example, a pressure sensor or the like may be disposed in the cooling air passage. Further, when a battery pack is configured by assembling a plurality of battery cells, the pressure sensor may be provided for each battery cell, or a common gas discharge path (communication to the passage 132 of each battery cell ( Only one may be provided in (not shown). 7 and 8, only one safety valve 140 is formed on the upper surface 135a. However, the present invention is not limited to this. For example, a safety valve may be provided on each of the upper and lower surfaces of the passage forming member 130.

(Third embodiment)
FIG. 9 is a perspective view of the passage forming member 230 used in the battery cell of the third embodiment, and shows only the cylindrical portion 235 that is the central portion. As described in the first embodiment, since the passage forming member 30 is housed in the exterior film together with the battery elements 22A and 22B, in principle, the passage forming member 30 needs to be made of an insulating material such as a resin. is there. On the other hand, since the passage forming member has a function of releasing heat from the battery element into the cooling air passage, the passage forming member is preferably made of a material having high thermal conductivity.

  In view of this point, the passage forming member 230 in the present embodiment is a cylindrical portion 235 made of a material with high thermal conductivity (also referred to as “thermal good conductor”) such as a metal material, and 2 attached to both surfaces thereof. Sheet of insulating films 245a and 245b. The cylindrical part 235 is in an insulated state by being sandwiched by two insulating films 245a and 245b from both sides. The two insulating films 245a and 245b may be heat-sealed with each other at the tip of the tapered portion 233B. According to the battery cell of this embodiment, since the cylindrical part 235 of the channel | path formation member 230 is comprised with heat good conductors, such as a metal material, the heat dissipation of a battery cell becomes a more favorable thing.

(Fourth embodiment)
The passage forming member may further be as shown in FIG. The passage forming member 330 in FIG. 10 has a connecting portion 337 formed so as to extend further outward from both ends in the X direction of the cylindrical portion 335 in the drawing. A projection 337 a is formed on the connection portion 337. According to such a configuration, the electrode tab 325 and the passage forming member 337 are connected to each other by engaging the hole 325a of the electrode tab 325 with the protrusion 337a of the connection portion 337. In addition, in order to connect an electrode tab and a channel | path formation member, naturally various connection forms other than the form shown in FIG. 9 can be utilized.

  When the electrode tab 325 is connected to the passage forming member 337, in other words, when one end side of the electrode tab 325 is supported by the passage forming member 337, the reliability of the final battery cell is as follows. Improves. That is, in the configuration of FIG. 10, the electrode tab 325 is more difficult to be displaced when a tensile load or the like is applied to the electrode tab 325. Since the electrode tab is not easily displaced in this manner, the electrical connection between the electrode tab 325 and the battery element is broken, or there is a gap between the electrode tab 325 and the film sealing portion. Occurrence is prevented, and as a result, the reliability of the battery cell is increased.

  It should be noted that various combinations of the configurations of the embodiments described above can be used. In addition, as described with reference to FIG. 15, increasing the battery capacity by increasing the battery element area may be applied to the battery element according to the present invention.

It is an external appearance perspective view which shows the structure of the battery cell of 1st Embodiment. It is a top view of the battery cell of FIG. It is sectional drawing in the AA cut line of FIG. It is a perspective view which shows the channel | path formation member used for the battery cell of 1st Embodiment in the single-piece | unit state. It is a perspective view which shows the form of the exterior film of the conventional film exterior battery as an example. It is a perspective view which shows the assembled battery comprised from the battery cell of 1st Embodiment. It is a perspective view of the channel | path formation member used for the battery cell of 2nd Embodiment. It is a fragmentary sectional view in the BB cut line of FIG. It is a perspective view of the channel | path formation member used for the battery cell of 3rd Embodiment. It is a perspective view of the channel | path formation member used for the battery cell of 4th Embodiment. It is sectional drawing which shows the structure of the conventional film-clad battery. It is sectional drawing which shows an example of the battery cell which aims at capacity increase by laminating | stacking a battery element. It is a top view which shows typically the structure of the conventional assembled battery. It is a perspective view which shows an example of the conventional thermal radiation means accommodated in the battery cell. It is a top view which shows the battery cell enlarged for the capacity increase of the battery.

Explanation of symbols

22A, 22B Battery element 23, 23a, 23b Sealing portion 24A, 24B, 24 Exterior film 25a, 25b, 325 Electrode tab 325a Hole 30 Passage forming member 32, 132, 232 Cooling air passage 32 'Passage 233B Tapered portion 35, 135 235, 335 Cylindrical part 35a, 135a Upper surface 35b, 135b Lower surface 337 Connection part 337a Projection 38 Side edge part 38A Film sticking part 38B Side wall 140 Safety valve 41 Through hole 245a, 245b Insulating film 50 Battery cell 60 Cup part 65 Corner part 80 assembled battery 81 tab support member

Claims (11)

A passage forming member comprising a cylindrical member having a flat cylindrical shape and side edge members provided at both ends in the axial direction of the cylindrical member; two battery elements disposed on both surfaces of the cylindrical member; Two exterior films surrounding and sealing the two battery elements, and cooling air is supplied to the inside of the cylindrical member through a passage formed in the side edge member. And
Two sides at both ends in the axial direction of the outer peripheral portion of the exterior film are attached to a part of each side edge member, and the exterior films are heat-sealed with each other on the other two sides. A film-clad battery in which the exterior film is folded two-dimensionally.   The said side edge member has a film sticking part which makes the said outer peripheral surface the said part to which an exterior film is stuck, The height dimension of this film sticking part is the thickness for the said two battery elements, The said passage formation member The film-clad battery according to claim 1, wherein the film-clad battery is set to be equal to or larger than the dimension including the thickness.   The film-clad battery according to claim 2, wherein a contour shape of the film pasting portion is a hexagon, and the exterior films are heat-sealed with each other at an acute angle portion in the hexagon.   The outer side of the film sticking portion in the side edge member is a side wall extending along one side of the battery element, and both ends of the side wall extend outward from both ends of the outer peripheral film. The film-clad battery according to claim 2 or 3.   Each said battery element is a film-clad battery of any one of Claim 1 to 4 arrange | positioned in the state which the one surface contact | adhered to the one surface of the said cylindrical member.   The film-clad battery according to any one of claims 1 to 5, wherein the inside of the cylindrical member is a plurality of cooling air passages partitioned by ribs.   The cylindrical member has a safety valve on at least one of its both surfaces, and the safety valve is a thin portion that is torn when the pressure of gas generated in the exterior film exceeds a predetermined set value. The film-clad battery according to claim 1.   It further has a sheet-like electrode tab that is electrically connected to each of the battery elements and drawn out from a portion where the exterior films are heat-sealed, and one end side of the electrode tab is supported by the passage forming member The film-clad battery according to claim 1.   The film exterior battery according to any one of claims 1 to 8, wherein the passage forming member is a resin molded product in which the cylindrical member and the side edge member are integrally formed.   The film-clad battery according to any one of claims 1 to 6, wherein the cylindrical member is made of a metal material, and is insulated by a film attached to an outer peripheral surface of the cylindrical member.   An assembled battery in which a plurality of the film-clad batteries according to claim 1 are assembled and the film-clad batteries are electrically connected in series and / or in parallel.

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