JP2019207858A - Cell - Google Patents

Abstract

To provide a cell in which possibility of failure of a valve mechanism is low when attaching a valve gear.SOLUTION: A cell 10 comprises a cell element 400, a housing body 100, and a valve gear 200. The housing body is constituted of a laminate having at least a base material layer, a barrier layer and a heat-fusible resin layer in this order, and receives the cell element inside. The valve gear communicates with the inside of the housing body. On the circumference of the housing body, a circumferential juncture 130 where facing heat-fusible resin layers are fused is formed. The valve gear includes a first portion and a second portion. The first portion has a valve mechanism, for decreasing pressure when the internal pressure of the housing body increases due to gas generated in the housing body, formed internally. The second portion has a ventilation path for introducing the gas, generated in the housing body, to the valve mechanism, formed internally. The first portion is located on the farther outside than the edge of the circumferential juncture, and at least a part of the second portion is sandwiched by the heat-fusible resin layers at the circumferential juncture.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery.

  Japanese Patent Laying-Open No. 2006-152231 (Patent Document 1) discloses a lithium ion battery including a battery element and an enclosing bag for accommodating the battery element therein. In this lithium ion battery, a one-way exhaust valve is attached to the enclosing bag. When gas is generated in the enclosed bag as the lithium ion battery is charged and discharged, excess gas is discharged from the one-way exhaust valve (see Patent Document 1).

JP 2006-152231 A

  In Patent Document 1, a method for attaching a one-way exhaust valve to a sealing bag is not disclosed. If the one-way exhaust valve is attached to the encapsulating bag by heat sealing, the valve mechanism in the one-way exhaust valve may fail due to heat and pressure applied during heat sealing.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a battery in which the valve mechanism is unlikely to fail when the valve device is attached.

  The battery according to the present invention includes a battery element, a container, and a valve device. The container is composed of a laminate having at least a base material layer, a barrier layer, and a heat-fusible resin layer in this order, and houses the battery element therein. The valve device communicates with the inside of the container. The heat-fusible resin layer is opposed to the periphery of the container. At the periphery of the container, a peripheral joint is formed by bonding the opposing heat-fusible resin layers to each other. The valve device includes a first portion and a second portion. The first part is a part in which a valve mechanism for reducing the pressure when the pressure inside the container rises due to the gas generated inside the container is formed inside. The second part is a part in which an air passage that guides the gas generated in the container to the valve mechanism is formed. The first portion is located outside the edge of the peripheral joint. At least a part of the second portion is sandwiched between the heat-fusible resin layers at the peripheral joint portion.

  In this battery, the second portion of the valve device is sandwiched between the heat-fusible resin layers at the peripheral joint portion, and the first portion of the valve device is not sandwiched between the heat-fusible resin layers. Therefore, in this battery, large pressure and heat are not applied to the first portion as compared with the second portion when the opposing heat-fusible resin layers are fused. As a result, according to this battery, the failure of the valve mechanism in the first portion due to the pressure and heat applied when the opposing heat-fusible resin layers are fused can be suppressed.

  Preferably, in the thickness direction of the battery, the length of the first portion is longer than the length of the second portion, and a step may be formed at the boundary between the first portion and the second portion.

  In this battery, at least the first part is longer than the second part in the thickness direction of the battery, and a step is formed at the boundary between the first part and the second part. Therefore, in this battery, when the second part is sandwiched between the heat-fusible resin layers in the battery manufacturing process, even if the valve device is pushed too far into the container, the stepped part is caught on the end of the laminate. Therefore, according to this battery, it is possible to suppress a situation in which the first portion is erroneously sandwiched between the heat-fusible resin layers in the battery manufacturing process. Further, in this battery, as compared to the case where no step is provided at the boundary between the first part and the second part, the thickness direction of the battery in the part where the second part is sandwiched among the peripheral joints. The difference between the length and the length in the thickness direction of the battery at the portion where the second portion is not sandwiched among the peripheral joints is small. Accordingly, in the portion where the second portion is sandwiched among the peripheral joint portions, the heat-fusible resin layers are fused together without applying an excessive amount of heat or pressure to the heat-fusible resin layer. As a result, according to this battery, it is possible to suppress a decrease in seal strength and a decrease in insulation due to the thinning of the heat-fusible resin layer. Here, the decrease in insulation is a phenomenon in which energization occurs between the barrier (metal) layer and the electrolyte due to partial thinning or cracking of the heat-fusible resin.

  Preferably, the length of the second portion in the width direction of the battery may be longer than the length of the second portion in the thickness direction of the battery.

  In this battery, the length of the second part in the thickness direction of the battery is shorter than the case where the cross-sectional shape of the second part is a perfect circle (the area is the same). That is, in this battery, the length in the thickness direction of the battery at the portion where the second portion is sandwiched among the peripheral joints, and the thickness direction of the battery at the portion where the second portion is not sandwiched among the peripheral joints. The difference with the length is small. Accordingly, in the portion where the second portion is sandwiched among the peripheral joint portions, the heat-fusible resin layers are fused together without applying an excessive amount of heat or pressure to the heat-fusible resin layer. As a result, according to this battery, it is possible to suppress a decrease in seal strength and a decrease in insulation due to the thinning of the heat-fusible resin layer.

  In addition, preferably, the second portion may have a wing-like extended end portion formed so as to become thinner toward an end portion in the width direction of the battery.

  In this battery, as compared with the case where the second portion is not provided with the wing-like extended end portion, the second portion of the peripheral joint portion is sandwiched from the portion of the peripheral joint portion where the second portion is not sandwiched. The change in the thickness direction of the battery at the position where it shifts to the smooth portion is smooth. Therefore, an unreasonable force is not applied to the laminate at the boundary between the position where the second portion is sandwiched between the heat-fusible resin layers and the position where the second portion is not sandwiched between the heat-fusible resin layers. As a result, according to this battery, since it can be appropriately fused without applying an excessive amount of heat or pressure to the heat-fusible resin layer, a reduction in seal strength due to thinning of the heat-fusible resin, A decrease in insulation can be suppressed.

  Also preferably, the cross-sectional shape of the air passage may be circular.

  Preferably, the length of the cross section of the air passage in the width direction of the battery may be longer than the length of the cross section of the air passage in the thickness direction of the battery.

  Preferably, the second portion may have a pillar formed in the air passage.

  In this battery, since the pillar is formed in the air passage of the second portion, even if pressure and heat are applied to the second portion sandwiched between the opposed heat-fusible resin layers, the air passage is not provided. Maintained. Therefore, according to this battery, it is possible to suppress breakage of the air passage in the second portion when the opposing heat-fusible resin layers are fused.

  Preferably, the outer surface of the second portion may be a pear ground.

  In this battery, since the outer surface of the second part is pear, the heat-fusible resin is easily melted at the position in contact with the second part. Therefore, according to this battery, compared with the case where the outer surface of the second part is smooth, the second part of the valve device can be firmly fixed to the container.

  Preferably, at least one ridge extending in the circumferential direction may be formed on the outer surface of the second portion.

  Since the ridge portion is surely in contact with the heat-fusible resin layer, it is easy to be fused to the laminate. In this battery, the protruding portion extends in the circumferential direction of the outer surface of the second portion. Therefore, according to this battery, the heat-fusible resin layer and the second portion can be fused in the circumferential direction of the second portion. Further, in this battery, the contact area between the outer surface of the second part and the heat-fusible resin is large as compared with the case where the protruding portion is not formed in the second part. Therefore, according to this battery, the second portion of the valve device can be relatively firmly fixed to the container. In addition, by providing a plurality of ridges, it is possible to further strengthen the fixation of the second part to the container.

  In addition, preferably, in the second portion, the corner in a plan view of the end portion opposite to the first portion side may be rounded.

  According to this battery, for example, when the end portion opposite to the first portion side is located inside the container, the possibility that the end portion damages the battery element in the container can be reduced. . Further, according to this battery, the possibility that the end portion damages the heat-fusible resin layer inside the container and reduces the insulating property of the heat-fusible resin layer can be reduced.

  Preferably, the outer shape of the cross section of the second portion with the center line of the air passage as a normal line is a polygon, and the corners of the polygon may be rounded.

  According to this battery, for example, when the end of the second part opposite to the first part is located inside the container, the part of the second part located in the container is in the container. The possibility of damaging the battery element can be reduced, and the portion of the second portion sandwiched between the heat-fusible resin layers damages the heat-fusible resin layer, thereby insulating the heat-fusible resin layer. The possibility of lowering the performance can be reduced. Further, according to this battery, for example, when the end of the second portion opposite to the first portion is sandwiched by the heat-fusible resin layer, the second portion is the heat-fusible resin. The possibility of damaging the layer and lowering the insulating property of the heat-fusible resin layer can be reduced.

  Preferably, each of the first part and the second part is made of a different material, and the melting point of the material of the first part may be higher than the melting point of the material of the second part.

  In this battery, even if pressure and heat are applied to the second part when the opposing heat-fusible resin layers are fused, the melting point of the material of the first part is higher than the melting point of the material of the second part. The first part is unlikely to be deformed by heat. Therefore, according to this battery, it is possible to suppress a failure of the valve mechanism in the first portion when the opposing heat-fusible resin layers are fused.

  Preferably, a flat surface may be formed on at least a part of the outer surface of at least one of the first and second portions.

  In this battery, since the flat surface is formed on the outer surface of the valve device, the valve device is prevented from rolling. Therefore, according to this battery, since the valve device does not roll when the valve device is attached to the housing, the valve device can be easily positioned.

  ADVANTAGE OF THE INVENTION According to this invention, the battery with a low possibility that a valve mechanism will fail at the time of attachment of a valve apparatus can be provided.

3 is a plan view of the battery according to the first embodiment. FIG. It is II-II sectional drawing of FIG. It is a figure which shows a container. It is a figure which shows an example of the cross-section of a packaging material. FIG. 3 is a plan view of the valve device in the first embodiment. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a VIII-VIII sectional view of Drawing 1, and is a figure for explaining the attachment state of a valve device. It is a flowchart which shows the manufacture procedure of a battery. It is a figure which shows the operation | movement which mounts a valve apparatus between a flange part and a packaging material. 6 is a plan view of a valve device according to Embodiment 2. FIG. It is XII-XII sectional drawing of FIG. FIG. 9 is a plan view of a valve device in a third embodiment. It is XIV-XIV sectional drawing of FIG. It is a top view of the valve apparatus in Embodiment 4. It is XVI-XVI sectional drawing of FIG. FIG. 10 is a plan view of a valve device in a fifth embodiment. FIG. 10 is a plan view of a valve device in a sixth embodiment. It is XIX-XIX sectional drawing of FIG. FIG. 10 is a plan view of a valve device in a seventh embodiment. It is XXI-XXI sectional drawing of FIG. It is a figure which shows the mode at the time of the attachment to the container of a valve apparatus. It is a figure which shows the cross section of the valve apparatus in the modification 1. FIG. It is a figure which shows the cross section of the valve apparatus in the modification 2. It is a figure which shows the cross section of the valve apparatus in the modification 3. It is a top view of the valve apparatus in the modification 4. It is XXVII-XXVII sectional drawing of FIG. It is a top view of the packaging material in the modification 5. It is XXIX-XXIX sectional drawing of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals and description thereof will not be repeated.

[1. Embodiment 1]
<1-1. Outline of the battery>
FIG. 1 is a plan view of battery 10 according to the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. The battery 10 has the positive electrode and the negative electrode of the tab 300 arranged on the opposite side, and is in a form that is considered for an electric vehicle such as an electric vehicle or a hybrid vehicle in which a number of batteries are connected in series and used at a high voltage.

  As shown in FIGS. 1 and 2, the battery 10 includes a container 100, a battery element 400, a tab 300, a tab film 310, and a valve device 200.

  The container 100 includes packaging materials 110 and 120. At the periphery of the container 100, the packaging materials 110 and 120 are heat-sealed, and the peripheral joint 130 is formed. That is, at the peripheral joint 130, the packaging materials 110 and 120 are fused to each other. The packaging materials 110 and 120 will be described in detail later.

  Battery element 400 is a power storage member such as a lithium ion battery or a capacitor. The battery element 400 is housed inside the housing body 100. When an abnormality occurs in the battery element 400, gas can be generated in the container 100. For example, when battery element 400 is a capacitor, gas may be generated in container 100 due to a chemical reaction in the capacitor.

  The tab 300 is a metal terminal used for power input / output in the battery element 400. One end of the tab 300 is electrically connected to the electrode (positive electrode or negative electrode) of the battery element 400, and the other end protrudes outward from the end edge of the container 100.

  The metal material constituting the tab 300 is, for example, aluminum, nickel, copper, or the like. For example, when the battery element 400 is a lithium ion battery, the tab 300 connected to the positive electrode is usually made of aluminum or the like, and the tab 300 connected to the negative electrode is usually made of copper, nickel or the like.

  The battery 10 includes two tabs 300. One tab 300 is sandwiched between the packaging materials 110 and 120 via the tab film 310 at the end of the container 100 in the arrow L direction. The other tab 300 is sandwiched between the packaging materials 110 and 120 via the tab film 310 at the end of the container 100 in the arrow R direction.

  The tab film 310 is an adhesive protective film, and is configured to adhere to both the packaging materials 110 and 120 and the tab 300 (metal). By using the tab film 310, the metal tab 300 can be fixed with the packaging materials 110 and 120. The tab film 310 preferably includes a heat-resistant layer or a heat-resistant component and has a short-circuit preventing function, particularly when used at a high voltage.

  The valve device 200 communicates with the inside of the container 100, and when the pressure in the container 100 becomes a predetermined value or more due to the gas generated in the container 100, the gas in the container 100 Is released to the outside. The casing of the valve device 200 is preferably a material that directly adheres to the innermost layers of the packaging materials 110 and 120, and a resin having the same heat-fusibility as the innermost layers of the packaging materials 110 and 120, such as polypropylene (PP). It is preferable that it is comprised with resin, such as. If a different material other than PP is used for reasons such as heat resistance, a method of sealing with an adhesive film on both the different material and PP is effective, as is the case with the tab film used for the tab. . The end side in the arrow B direction of the valve device 200 is sandwiched between the packaging materials 110 and 120 on the end side in the arrow F direction of the container 100. The valve device 200 will be described in detail later.

  In battery 10 according to the first embodiment, various structural devices are employed when attaching valve device 200 to housing 100. Hereinafter, the configuration of the container 100, the configuration of the valve device 200, the attached state of the valve device 200 to the container 100, and the method for manufacturing the battery 10 will be described in order.

  The direction indicated by each arrow LRUDFB is common to the drawings. Hereinafter, the arrow LR direction is also referred to as “battery 10 width direction”, and the arrow UD direction is also referred to as “battery 10 thickness direction”.

<1-2. Structure of container>
FIG. 3 is a view showing the container 100. As shown in FIG. 3, the container 100 includes packaging materials 110 and 120. Each of the packaging materials 110 and 120 is formed of a so-called laminate film, and the shape in plan view is substantially the same rectangular shape.

  The packaging material 110 includes a molded part 112 that is molded so that the space S1 is formed, and a flange part 114 that extends from the molded part 112 in the arrow FB direction and the arrow LR direction. In the molding part 112, the surface in the arrow U direction is open. The battery element 400 (FIG. 1) is disposed in the space S1 through the open surface.

  FIG. 4 is a diagram illustrating an example of a cross-sectional structure of the packaging materials 110 and 120. As shown in FIG. 4, each of the packaging materials 110 and 120 is a laminate in which a base layer 31, an adhesive layer 32, a barrier layer 33, an adhesive layer 34, and a heat-fusible resin layer 35 are laminated in this order. It is. Note that each of the packaging materials 110 and 120 does not necessarily include the layers shown in FIG. 4, and may include at least the base material layer 31, the barrier layer 33, and the heat-fusible resin layer 35 in this order. Good.

  In the container 100, the base material layer 31 is the outermost layer, and the heat-fusible resin layer 35 is the innermost layer. When the battery 10 is assembled, the heat-fusible resin layers 35 located on the peripheral edges of the packaging materials 110 and 120 are heated with the battery element 400 (FIG. 2) disposed in the space S1 (FIG. 3). By fusing, the peripheral joint 130 is formed, the battery element 400 is sealed in the container 100, the valve device 200 is fused and fixed to the peripheral joint 130, and the tab 300 is also a tab film 310. It is fused and fixed to the peripheral joint portion 130 via. Hereinafter, each layer included in the packaging materials 110 and 120 will be described. In addition, as thickness of the packaging materials 110 and 120, about 50-200 micrometers, for example, Preferably about 90-150 micrometers is mentioned.

(1-2-1. Base material layer)
The base material layer 31 is a layer that functions as a base material for the packaging materials 110 and 120 and is a layer that forms the outermost layer side of the container 100.

  The material for forming the base material layer 31 is not particularly limited as long as it has insulating properties. Examples of the material for forming the base material layer 31 include polyester, polyamide, epoxy, acrylic, fluororesin, polyurethane, silicon resin, phenol, polyetherimide, polyimide, polycarbonate, and a mixture or copolymer thereof. . The base material layer 31 may be, for example, a resin film formed of the above resin, or may be formed by applying the above resin. The resin film may be an unstretched film or a stretched film. Examples of the stretched film include a uniaxially stretched film and a biaxially stretched film, and a biaxially stretched film is preferable. Examples of the stretching method for forming the biaxially stretched film include a sequential biaxial stretching method, an inflation method, and a simultaneous biaxial stretching method. Furthermore, the base material layer 31 may be a single layer or may be composed of two or more layers. When the base material layer 31 is composed of two or more layers, the base material layer 31 may be a laminate in which a resin film is laminated with an adhesive or the like, or two or more layers may be formed by co-extrusion of a resin. It may be a laminated body of resin films. Moreover, the resin film laminate obtained by coextrusion of the resin to form two or more layers may be used as the base material layer 31 without being stretched, or may be used as the base material layer 31 by uniaxial stretching or biaxial stretching. As a specific example of the laminate of the resin film in which the base material layer 31 is two or more layers, a laminate of a polyester film and a nylon film, a laminate of two or more nylon films, a laminate of two or more polyester films Preferably, a laminate of a stretched nylon film and a stretched polyester film, a laminate of two or more stretched nylon films, and a laminate of two or more stretched polyester films are preferable. For example, when the base material layer 31 is a laminate of two resin films, a laminate of a polyester resin film and a polyester resin film, a laminate of a polyamide resin film and a polyamide resin film, or a polyester resin film and a polyamide resin film. A laminate is preferable, and a laminate of a polyethylene terephthalate film and a polyethylene terephthalate film, a laminate of a nylon film and a nylon film, or a laminate of a polyethylene terephthalate film and a nylon film is more preferable. The polyester resin is preferably located in the outermost layer of the base material layer 31.

  As thickness of the base material layer 31, about 3-50 micrometers is mentioned, for example, Preferably about 10-35 micrometers is mentioned.

(1-2-2. Adhesive layer)
The adhesive layer 32 is a layer that is disposed on the base material layer 31 as necessary in order to impart adhesion to the base material layer 31. That is, the adhesive layer 32 is provided between the base material layer 31 and the barrier layer 33 as necessary.

  The adhesive layer 32 is formed of an adhesive capable of bonding the base material layer 31 and the barrier layer 33. The adhesive used for forming the adhesive layer 32 may be a two-component curable adhesive or a one-component curable adhesive. Further, the adhesive mechanism of the adhesive used for forming the adhesive layer 32 is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a thermal melting type, a thermocompression bonding type, and the like.

  Examples of the thickness of the adhesive layer 32 include about 1 to 10 μm, preferably about 2 to 5 μm.

(1-2-3. Barrier layer)
The barrier layer 33 is a layer having a function of preventing moisture, oxygen, light and the like from entering the battery 10 in addition to improving the strength of the packaging materials 110 and 120. As a metal which comprises the barrier layer 33, aluminum, stainless steel, titanium etc. are mentioned, for example, Preferably aluminum is mentioned. The barrier layer 33 can be formed by, for example, a metal foil, a metal vapor-deposited film, an inorganic oxide vapor-deposited film, a carbon-containing inorganic oxide vapor-deposited film, a film provided with these vapor-deposited films, or the like. It is preferable to use aluminum foil. From the viewpoint of preventing the generation of wrinkles and pinholes in the barrier layer 33 during the production of each packaging material, the barrier layer may be, for example, annealed aluminum (JIS H4160: 1994 A8021H-O, JIS H4160: 1994). A8079H-O, JIS H4000: 2014 A8021P-O, and JIS H4000: 2014 A8079P-O) are more preferable.

  Although the thickness of the barrier layer 33 will not be restrict | limited especially if it functions as a barrier layer, such as water vapor | steam, For example, about 10-100 micrometers, Preferably it can be set as about 20-80 micrometers.

(1-2-4. Adhesive layer)
The adhesive layer 34 is a layer provided as necessary between the barrier layer 33 and the heat-fusible resin layer 35 in order to firmly bond the heat-fusible resin layer 35.

  The adhesive layer 34 is formed of an adhesive capable of bonding the barrier layer 33 and the heat-fusible resin layer 35. The composition of the adhesive used for forming the adhesive layer 34 is not particularly limited, and is, for example, a resin composition containing acid-modified polyolefin. The acid-modified polyolefin is not particularly limited as long as it is an acid-modified polyolefin, and preferably includes a polyolefin graft-modified with an unsaturated carboxylic acid or an anhydride thereof.

  Examples of the thickness of the adhesive layer 34 include about 1 to 50 μm, preferably about 2 to 40 μm.

(1-2-5. Heat-fusible resin layer)
The heat-fusible resin layer 35 forms the innermost layer of the container 100. The heat-fusible resin layer 35 seals the battery element 400 in the container 100 by heat-sealing with the opposing heat-fusible resin layer at the periphery of the container 100. In addition, the insulating property between the electrolytic solution and the barrier layer metal can be maintained by covering the barrier layer with the heat-fusible resin having a certain thickness or more.

  The resin component used for the heat-fusible resin layer 35 is not particularly limited as long as the heat-fusible resin layer 35 can be heat-sealed, and examples thereof include polyolefin and acid-modified polyolefin.

  Examples of the polyolefin include polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, and linear low density polyethylene; homopolypropylene, polypropylene block copolymer (for example, block copolymer of propylene and ethylene), random copolymer of polypropylene ( Examples thereof include crystalline or amorphous polypropylene such as a random copolymer of propylene and ethylene; and a terpolymer of ethylene-butene-propylene. Among these polyolefins, polyethylene and polypropylene are preferable. In addition, the acid-modified polyolefin is not particularly limited as long as it is an acid-modified polyolefin, but preferably includes a polyolefin graft-modified with an unsaturated carboxylic acid or an anhydride thereof.

  Further, the thickness of the heat-fusible resin layer 35 is not particularly limited, but is preferably 100 μm or less, more preferably about 15 to 90 μm, and further preferably about 30 to 80 μm.

<1-3. Configuration of valve device>
FIG. 5 is a plan view of the valve device 200. As shown in FIG. 5, the valve device 200 includes a valve function part 210 and a seal attachment part 220. Although details will be described later, at least a part of the seal mounting portion 220 is a portion that is sandwiched and fixed between the packaging materials 110 and 120 (FIG. 2), and is heat-sealed, so that the seal mounting portion 220 The outer peripheral surface of 220 and the heat-fusible resin layer 35 which is the innermost layer of the packaging materials 110 and 120 are fused and joined.

  In the seal attachment portion 220, R is formed at the corner of the end in the arrow B direction. That is, R (for example, R = 0.2 mm to 2.0 mm) is formed at a corner in a plan view of the end of the seal attachment portion 220 opposite to the valve function portion 210 side. In the present specification, rounded corners are expressed as “R is formed”. Here, “R is formed” is structurally the same as chamfered, meaning that the corners are rounded, and further, “R” alone, Used to mean corner radius. It is possible to chamfer the corners generated in the manufacturing process of the valve device 200 to round the corners (to form R), but the casing of the valve device 200 is a resin molded product. In this case, it is also possible to form R without chamfering such as cutting by forming so as to have rounded corners from the beginning.

  6 is a cross-sectional view taken along the line VI-VI in FIG. As shown in FIG. 6, in the valve device 200, the cross section of each of the valve function part 210 and the seal attachment part 220 is a circular shape, and an air passage A <b> 1 is formed inside the seal attachment part 220. The cross section of the air passage A1 is a perfect circle.

  In the valve device 200, the length L2 of the valve function part 210 in the thickness direction (arrow UD direction) of the battery 10 is longer than the length L1 of the seal attachment part 220 in the thickness direction of the battery 10. The length L2 of the valve function part 210 in the width direction (arrow LR direction) of the battery 10 is longer than the length L1 of the seal attachment part 220 in the width direction of the battery 10. That is, the diameter of the cross section of the valve function part 210 is longer than the diameter of the cross section of the seal attachment part 220. As a result, a step is formed at the boundary between the valve function part 210 and the seal attachment part 220 (FIG. 5).

  7 is a cross-sectional view taken along the line VII-VII in FIG. As shown in FIG. 7, R (for example, R = 0.2 mm to 2.0 mm) is formed at the end in the arrow B direction of the seal attachment portion 220. An air passage A1 is formed in the seal attachment portion 220. The ventilation path A1 guides the gas generated in the container 100 to the valve function unit 210, for example.

  A valve mechanism configured to discharge gas generated in the container 100 (FIG. 1) is provided inside the valve function unit 210. Specifically, the valve function unit 210 includes an O-ring 212, a ball 214, a spring 216, and a membrane 218. That is, the valve function unit 210 is provided with a ball spring type valve mechanism. The valve mechanism provided in the valve function unit 210 is not particularly limited as long as the pressure in the container 100 raised due to the gas can be reduced. For example, a poppet type, a duck bill type, an umbrella type, a diaphragm, etc. A valve mechanism such as a mold may be used.

The O-ring 212 is a hollow circular ring and is made of, for example, fluororubber. Each of the ball 214 and the spring 216 is made of stainless steel, for example. The ball 214 may be made of resin. Membrane 218, for example, ^10-2 have to 10 ⁰ [mu] m approximately pore diameter (pore For diameter), without leaking the electrolyte is composed of a PTFE membrane as the only gas permeable (permselective). PTFE means polytetrafluoroethylene. In addition, since the PTFE membrane is a soft material, if it is insufficient in strength, it can be integrally reinforced with a mesh or nonwoven fabric such as polypropylene or polyester.

  When the pressure in the container 100 reaches a predetermined pressure with the valve device 200 attached to the container 100, the gas guided from the ventilation path A1 presses the ball 214 in the direction of arrow F. When the ball 214 is pressed and the spring 216 contracts, the gas in the container 100 passes through the gap formed between the ball 214 and the O-ring 212, passes through the membrane 218, and is discharged from the exhaust port O1. Is discharged outside.

<1-4. Installation state of valve device>
FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 1, and is a view for explaining an attachment state of the valve device 200. As shown in FIG. 8, the valve function part 210 of the valve device 200 is located outside the end edge of the peripheral joint part 130. On the other hand, a part of the seal attachment portion 220 of the valve device 200 is sandwiched between the heat-fusible resin layer 35 of the packaging material 110 and the heat-fusible resin layer 35 of the packaging material 120 at the peripheral joint portion 130. The outer peripheral surface of the seal mounting portion 220 and the heat-fusible resin layer 35 which is the innermost layer of the packaging material 110, 120 are fused and joined. 8 illustrates that the valve device 200 is in a state of being fused and bonded to the heat-fusible resin layer 35 that is the innermost layer of the packaging materials 110 and 120. Although the adhesive resin layer 35 is partially illustrated only in the vicinity of the peripheral joint portion 130, the heat-fusible resin layer 35 is provided on the entire surface of the packaging materials 110 and 120.

  In battery 10 according to the first embodiment, seal attachment portion 220 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130 and valve function portion 210 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130. The reason why this is not the case will be described next.

  Suppose that the valve function part 210 is sandwiched between the heat-fusible resin layers 35 at the peripheral joint part 130. In this case, when the heat-fusible resin layer 35 is fused to each other at the periphery of the packaging materials 110 and 120 (when heat-sealing), the valve mechanism in the valve function unit 210 breaks down due to the applied heat and pressure. there's a possibility that.

  In the battery 10 according to the first embodiment, it is the seal attachment portion 220 that is sandwiched between the heat-fusible resin layers 35 at the peripheral joint portion 130, and the valve function portion 210 is sandwiched between the heat-fusible resin layers 35. Not. Therefore, in the battery 10, large pressure and heat are not applied to the valve function unit 210 during heat sealing. That is, in the battery 10, the valve function unit 210 is not sandwiched between the heat-fusible resin layers 35, so that the failure of the valve mechanism due to the pressure and heat applied during heat sealing is suppressed.

  Moreover, in the battery 10 according to the first embodiment, as described above, the diameter of the cross section of the seal attachment portion 220 is shorter than the diameter of the cross section of the valve function portion 210. Therefore, compared with the case where the diameter of the cross section of the seal attachment portion 220 is equal to or larger than the diameter of the cross section of the valve function portion 210, the battery thickness direction of the peripheral joint portion 130 where the seal attachment portion 220 is sandwiched. The difference between the length L4 and the length L3 in the thickness direction of the battery in the portion of the peripheral joint 130 where the seal attachment portion 220 is not sandwiched is small. As the difference is larger, the outer peripheral surface of the seal mounting portion 220 is fused with the heat-fusible resin layer, which is the innermost layer of the packaging material 110, 120, so that the heat-sealed state is obtained. It is necessary to increase the pressure. As a result, the pressure applied to the periphery of the container 100 for heat sealing increases. When the pressure increases, there is a possibility that the heat-fusible resin layer 35 becomes thin particularly at a position where the seal attachment portion 220 is sandwiched, and further at a position where the tab film 310 and the tab 300 are sandwiched. When the heat-fusible resin layer 35 becomes thin, there is a possibility that dielectric breakdown occurs in the battery 10.

  In battery 10 according to the first embodiment, as described above, the difference between length L4 and length L3 is small. Therefore, when the periphery of the container 100 is sandwiched by the heat sealer, pressure and heat are appropriately applied to the heat-fusible resin layer over the entire periphery of the container 100. As a result, according to the battery 10, while the possibility of dielectric breakdown occurring in the battery 10 is reduced, the opposing heat-fusible resin layer 35 is appropriately fused, and the seal attachment portion 220 is firmly attached to the container 100. Can be fixed.

  Further, in battery 10 according to the first embodiment, the end portion in the direction of arrow B of seal attachment portion 220 protrudes into space S <b> 1 from flange portion 114. Therefore, depending on how the battery 10 is used, there is a possibility that the end of the seal mounting portion 220 in the direction of arrow B contacts the battery element 400. In battery 10 according to the first embodiment, as described above, R is formed at the end in the arrow B direction of seal attaching portion 220 (FIG. 5). Therefore, even if the end of the seal attachment portion 220 comes into contact with the battery element 400, it is unlikely that the end will damage the battery element 400. Further, depending on the usage state of the battery 10, the end in the arrow B direction of the seal attachment portion 220 may come into contact with the heat-fusible resin layer 35 of the packaging material 120. In battery 10 according to the first embodiment, as described above, R is formed at the end in the direction of arrow B of seal attachment portion 220, so that the end of seal attachment portion 220 is assumed to be the heat of packaging material 120. Even if it comes into contact with the fusible resin layer 35, the end portion is unlikely to damage the heat fusible resin layer 35.

<1-5. Manufacturing method>
FIG. 9 is a flowchart showing the manufacturing procedure of the battery 10. For example, the battery 10 is manufactured by a manufacturing apparatus.

  Referring to FIG. 9, the manufacturing apparatus places each component in container 100 (step S100). For example, the manufacturing apparatus places the tab on the flange portion 114 of the packaging material 110 by placing the battery element 400 in which the tab 300 with the tab film 310 is electrically connected by welding in the space S1 in the packaging material 110. The tab with the film 310 is placed, and then the valve device 200 is placed on the flange portion 114 of the packaging material 110. The battery element 400 is placed in the space S1 in the packaging material 110, and then the tab 300 with the tab film 310 is welded and electrically connected to the battery element 400, and the flange portion 114 of the packaging material 110 is electrically connected. It is also possible to place the tab with the tab film 310 on the top, and then place the valve device 200 on the flange portion 114 of the packaging material 110. Then, the manufacturing apparatus places the packaging material 120 on the packaging material 110.

  FIG. 10 is a diagram illustrating an operation of placing the valve device 200 between the flange portion 114 of the packaging material 110 and the packaging material 120. As shown in FIG. 10, a step is formed between the valve function part 210 and the seal attachment part 220. Therefore, when the seal attachment portion 220 is sandwiched between the packaging materials 110 and 120, even if the valve device 200 is pushed too far into the container 100, the stepped portion is caught on the end portions of the packaging materials 110 and 120. Therefore, according to the battery 10, it is possible to suppress a situation in which the valve function unit 210 is erroneously sandwiched between the packaging materials 110 and 120 (the heat-fusible resin layer 35) in the manufacturing process of the battery 10.

  When the placement of each component is completed, the manufacturing apparatus heat seals the periphery of the container 100 (step S200). That is, the manufacturing apparatus sandwiches the periphery of the container 100 and applies pressure and heat to the periphery of the container 100. Thereby, the opposing heat-fusible resin layers 35 are fused to each other at the peripheral edge of the container 100, and the peripheral joint portion 130 is formed. Then, the battery element 400 is sealed in the container 100, the valve device 200 is fused and fixed to the peripheral joint 130, and the tab 300 is also fused to the peripheral joint 130 via the tab film 310. The battery 10 is fixed. In the heat sealing step, the inside of the container 100 is degassed so that unnecessary gas is not contained in the container 100. Specifically, without joining the entire circumference, leaving a peripheral edge in an unjoined state in part, degassing from the peripheral edge in the unjoined state, and finally applying pressure and heat to the peripheral edge in the unjoined state. In addition, the peripheral joint 130 on the entire circumference is completed. Furthermore, in the case of a battery that requires an electrolyte, the entire circumference is not joined, leaving a part of the unjoined circumference. In some cases, the electrolyte solution is injected from the peripheral edge of the unbonded state, deaerated, and finally, the peripheral edge joint portion 130 is completed by applying pressure and heat to the peripheral edge of the unbonded state.

  It is also effective to make the shape of the surface of the seal bar of the manufacturing apparatus sandwiching the periphery of the container 100 along the outer shape of the seal mounting portion 220. In this case, the adhesion between the heat-fusible resin layers 35 at the position where the seal attachment portion 220 is sandwiched becomes stronger. Even in this case, in order to reduce the deformation and load of the packaging materials 110 and 120, it is effective to make the shape of the seal attachment portion 220 flat as in the second embodiment described later.

<1-6. Features>
As described above, in the battery 10 according to the first embodiment, at least a part of the seal attachment portion 220 of the valve device 200 is sandwiched between the heat-fusible resin layers 35 at the peripheral joint portion 130, so The valve function part 210 is not sandwiched between the heat-fusible resin layers 35 at the peripheral joint part 130. Therefore, in the battery 10, large pressure and heat are not applied to the valve function part 210 compared to the seal attachment part 220 when the opposing heat-fusible resin layer 35 is fused. As a result, according to the battery 10, it is possible to suppress a failure of the valve mechanism in the valve function unit 210 due to the pressure and heat applied when the opposed heat-fusible resin layer 35 is fused.

  The battery element 400 is an example of the “battery element” of the present invention, the container 100 is an example of the “container” of the present invention, and the valve device 200 is an example of the “valve apparatus” of the present invention. It is. The base material layer 31 is an example of the “base material layer” of the present invention, the barrier layer 33 is an example of the “barrier layer” of the present invention, and the heat-fusible resin layer 35 is the “heat base” of the present invention. It is an example of a “fusible resin layer”. The peripheral joint part 130 is an example of the “peripheral joint part” in the present invention. The valve function part 210 is an example of the “first part” in the present invention, and the seal attachment part 220 is an example of the “second part” in the present invention. The air passage A1 is an example of the “air passage” in the present invention.

  In addition, in order to easily understand that the battery element 400 is accommodated in the space S1 in the container 100, the battery element 400 is illustrated in a small size with respect to the space S1 of the container 100 for convenience. However, since the battery element 400 is placed in the space S1 in the manufacturing process, the space S1 is slightly larger than the battery element 400, but is deaerated as described above in the manufacturing process. The space S1 is slightly reduced with deaeration to be approximately the same size as the battery element 400, and the battery element 400 is accommodated in the space S1 with almost no gap.

[2. Second Embodiment]
In this Embodiment 2, compared with the said Embodiment 1, the structure of a valve apparatus differs. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 11 is a plan view of valve device 200A mounted on the battery according to the second embodiment. As shown in FIG. 11, the valve device 200A includes a valve function part 210A and a seal attachment part 220A. The seal attachment part 220A is a part that is at least partially sandwiched between the packaging materials 110 and 120 and heat-sealed. The seal attachment portion 220A has a different cross-sectional shape as compared with the first embodiment. The valve function unit 210A is basically the same as that of the first embodiment, but the housing and the valve mechanism depend on the difference in the shape of the air passage A6 (FIG. 12) formed in the seal attachment unit 220A. Part of the shape has been changed.

  12 is a cross-sectional view taken along the line XII-XII in FIG. As shown in FIG. 12, in the cross section of the seal attachment portion 220A, the length L5 in the battery width direction (arrow LR direction) is longer than the length L6 in the battery thickness direction (arrow UD direction). More specifically, the cross-sectional shape of the seal attachment portion 220A is an elliptical shape.

  An air passage A6 is formed in the seal attachment portion 220A. Also in the air passage A6, the length in the width direction of the battery is longer than the length in the thickness direction of the battery. More specifically, the cross-sectional shape of the air passage A6 is an elliptical shape.

  As described above, in the second embodiment, in the cross section of the seal attachment portion 220A, the length L5 in the width direction of the battery is longer than the length L6 in the thickness direction of the battery. That is, the length of the seal attachment portion 220A in the thickness direction of the battery is shorter than when the cross-sectional shape of the seal attachment portion is a perfect circle (the area is the same). In this battery, the length in the thickness direction of the battery in the portion where the seal attachment portion 220A is sandwiched in the peripheral joint portion 130, and the thickness of the battery in the portion where the seal attachment portion 220A is not sandwiched in the peripheral joint portion 130. The difference from the direction length is smaller. Therefore, according to this battery, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire periphery of the container 100, and the opposite heat-fusible resin layer 35 can be appropriately fused. Therefore, the seal attachment portion 220A of the valve device 200A can be firmly fixed to the container 100.

  The valve device 200A is an example of the “valve device” of the present invention, the valve function part 210A is an example of the “first part” of the present invention, and the seal attachment part 220A is the “second part” of the present invention. It is an example of “part”. The air passage A6 is an example of the “air passage” in the present invention.

[3. Embodiment 3]
In the third embodiment, the configuration of the valve device is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 13 is a plan view of valve device 200B mounted on the battery according to the third embodiment. As shown in FIG. 13, the valve device 200B includes a valve function part 210B and a seal attachment part 220B. The seal attachment part 220B is a part that is at least partially sandwiched between the packaging materials 110 and 120 and heat-sealed. The seal attachment portion 220B has a different cross-sectional shape as compared with the first embodiment. The valve function part 210B is basically the same as that of the first embodiment, but the housing and the valve mechanism are changed according to the difference in the shape of the air passage A7 (FIG. 14) formed in the seal attachment part 220B. Some of the shapes have been changed.

  14 is a cross-sectional view taken along the line XIV-XIV in FIG. As shown in FIG. 14, in the seal attachment portion 220 </ b> B, wing-like extended end portions 40 and 41 are formed at both ends in the battery width direction (arrow LR direction). Each of the wing-like extended end portions 40 and 41 has a shape that becomes thinner as it approaches the end portion in the width direction of the battery. From another point of view, each of the wing-like extended end portions 40, 41 has a change in length in the thickness direction of the battery in the arrow LR direction as compared with the other portion (circular portion) of the seal attachment portion 22. Can be said to be a gradual part.

  In the battery according to the third embodiment, as compared with the first embodiment (when the wing-like extended end portions 40 and 41 are not provided in the seal attachment portion 220B), the seal attachment portion 220B is included in the peripheral joint portion 130. The change in the thickness direction of the battery is smooth at the position where the seal attachment portion 220B is shifted to the portion where the seal attachment portion 220B is sandwiched from the portion not sandwiched. Therefore, according to this battery, packaging is performed at the boundary between the position where the seal attachment portion 220B is sandwiched between the heat-fusible resin layers 35 and the position where the seal attachment portion 220B is not sandwiched between the heat-fusible resin layers 35. Since an excessive force is not applied to the materials 110 and 120, the seal mounting portion 220B of the valve device 200B can be firmly fixed to the container 100.

  The valve device 200B is an example of the “valve device” of the present invention, the valve function part 210B is an example of the “first part” of the present invention, and the seal attachment part 220B is the “second part” of the present invention. It is an example of “part”. The wing-like extended end portions 40 and 41 are examples of the “wing-like extended end portion” of the present invention. The air passage A7 is an example of the “air passage” in the present invention.

[4. Embodiment 4]
In the fourth embodiment, the configuration of the valve device is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 15 is a plan view of valve device 200C mounted on the battery according to the fourth embodiment. As shown in FIG. 15, the valve device 200C includes a valve function part 210C and a seal attachment part 220C. The seal attachment portion 220C is a portion that is at least partially sandwiched between the packaging materials 110 and 120 and heat-sealed. The seal attachment portion 220C has a different cross-sectional shape as compared with the first embodiment. The valve function unit 210C is basically the same as that of the first embodiment, but the housing and the valve mechanism are changed according to the difference in the shape of the air passage A2 (FIG. 16) formed in the seal attachment unit 220C. Part of the shape has been changed.

  16 is a cross-sectional view taken along the line XVI-XVI of FIG. As shown in FIG. 16, pillars 50 and 51 are formed in the seal attachment portion 220C (in the air passage A2). Each of the pillars 50 and 51 extends in the battery thickness direction (arrow UD direction), and both ends in the battery thickness direction are connected to the inner periphery of the seal attachment portion 220C. Each of the pillars 50 and 51 extends in the direction of the arrow FB in the ventilation path A2 (FIG. 15). Note that the number of pillars is not necessarily two, but may be at least one.

  In the battery according to the fourth embodiment, since the pillars 50 and 51 are formed in the air passage A2, pressure and heat are applied to the seal attachment portion 220C sandwiched between the opposed heat-fusible resin layers 35. Even so, the air passage A2 is maintained. Therefore, according to this battery, breakage of the air passage A2 in the seal attachment portion 220C at the time of fusion of the opposing heat-fusible resin layer 35 can be suppressed.

  The valve device 200C is an example of the “valve device” of the present invention, the valve function unit 210C is an example of the “first part” of the present invention, and the seal mounting portion 220C is the “second device” of the present invention. It is an example of “part”. The pillars 50 and 51 are examples of the “pillar” of the present invention. The air passage A2 is an example of the “air passage” in the present invention.

[5. Embodiment 5]
In the fifth embodiment, the configuration of the valve device is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 17 is a plan view of valve device 200D mounted on the battery according to the fifth embodiment. As shown in FIG. 17, the valve device 200D includes a valve function part 210 and a seal attachment part 220D. The configuration of the valve function unit 210 is the same as that of the first embodiment.

  The seal attachment portion 220D is a portion at least a part of which is sandwiched between the packaging materials 110 and 120 and heat sealed. The outer surface of seal attachment portion 220D is different from that of the first embodiment. Specifically, the outer surface of the seal attachment portion 220D is a pear. The pear surface has a surface roughness Ra of, for example, 1 μm to 20 μm.

  In the battery according to the fifth embodiment, since the outer surface of seal attachment portion 220D is pear, the heat-fusible resin is likely to melt at the position where it abuts on seal attachment portion 220D. Therefore, according to this battery, the seal mounting portion 220D of the valve device 200D can be firmly fixed to the housing body 100 as compared with the first embodiment (when the outer surface of the seal mounting portion 220D is smooth). .

  The valve device 200D is an example of the “valve device” in the present invention, and the seal attachment portion 220D is an example of the “second portion” in the present invention.

[6. Embodiment 6]
In the sixth embodiment, the configuration of the valve device is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 18 is a plan view of valve device 200E mounted on the battery according to the sixth embodiment. As shown in FIG. 18, the valve device 200E includes a valve function part 210 and a seal attachment part 220E. The configuration of the valve function unit 210 is the same as that of the first embodiment.

  At least a part of the seal attachment portion 220E is sandwiched between the packaging materials 110 and 120 and is heat sealed. The outer surface of the seal attachment portion 220E is different from that of the first embodiment. Specifically, on the outer surface of the seal attachment portion 220E, a ridge 60 that continuously extends in the circumferential direction is formed. Three protrusions 60 are formed in the arrow FB direction in the seal attachment portion 220E. In addition, the number of the protruding item | line parts 60 does not necessarily need to be three, and at least one should just be formed.

  19 is a cross-sectional view taken along line XIX-XIX in FIG. As FIG. 19 shows, the cross section of the protruding item | line part 60 is semicircle shape. The semicircular R is, for example, 0.05 mm to 1.0 mm. Of the seal attachment portion 220E, the diameter L12 (the length in the thickness direction of the battery, the length in the width direction of the battery) in the portion where the ridge portion 60 is formed is the portion in which the ridge portion 60 is not formed. It is longer than the diameter L11.

  At the time of heat sealing, the ridges 60 are in contact with the heat-fusible resin layer 35 with certainty, and thus are easily fused to the packaging materials 110 and 120. In the battery according to the sixth embodiment, the ridge 60 extends continuously in the circumferential direction of the outer surface of the seal mounting portion 220E. Therefore, according to this battery, the heat-fusible resin layer 35 and the seal attachment portion 220E can be fused together in the circumferential direction of the seal attachment portion 220E. Further, in this battery, as compared with the first embodiment (when the convex portion 60 is not formed on the seal attachment portion 220E), the contact area between the outer surface of the seal attachment portion 220E and the heat-fusible resin. Therefore, the seal attachment portion 220E of the valve device 200E can be firmly fixed to the packaging material 110.

  The valve device 200E is an example of the “valve device” in the present invention, and the seal attachment portion 220E is an example of the “second portion” in the present invention. The ridge 60 is an example of the “projection” in the present invention. The air passage A3 is an example of the “air passage” in the present invention.

  In the sixth embodiment, the ridge 60 extends continuously in the circumferential direction, but the formation position of the ridge 60 may not be present in the entire circumference as long as it extends in the circumferential direction. It does not have to be continuous. For example, when the wing-like extended end portions 40 and 41 as in the above-described third embodiment are provided, it is not necessary to provide the projecting ridge portion 60 that makes one turn including the wing-like extended end portions 40 and 41. It is possible that the tip portions of the end portions 40 and 41 are not provided with the protruding strip portion 60, or the wing-like extended end portions 40 and 41 may not be provided with the protruding strip portion 60. It is also possible to form them intermittently.

[7. Embodiment 7]
In the seventh embodiment, the configuration of the valve device is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Here, a different part from Embodiment 1 is demonstrated.

  FIG. 20 is a plan view of valve device 200F mounted on the battery according to the seventh embodiment. As shown in FIG. 20, the valve device 200F includes a valve function part 210F and a seal attachment part 220F. The seal attachment portion 220F is a portion that is at least partially sandwiched between the packaging materials 110 and 120 and heat sealed. The valve function part 210F and the seal attachment part 220F are different in cross-sectional shape compared to the first embodiment.

  21 is a cross-sectional view taken along XXI-XXI in FIG. As shown in FIG. 21, the cross section of the valve function part 210F is semicircular. That is, the surface of the valve function part 210F in the arrow U direction is a flat surface. Further, the cross section of the seal attachment portion 220F has wing-like extended end portions 40F and 41F at both ends in the direction of the arrow LR. The surface of the seal attachment portion 220F in the arrow U direction is a flat surface. The surface of the valve function part 210F in the direction of the arrow U and the surface of the seal attachment part 220F in the direction of the arrow U are flush with each other.

  Therefore, when the valve device 200F is disposed with the surface in the arrow U direction down, the valve device 200F does not roll. Therefore, according to the battery according to the seventh embodiment, the valve device 200F does not roll when the valve device 200F is attached to the housing 100, so that the valve device 200F can be easily positioned.

  FIG. 22 is a diagram illustrating a state when the valve device 200F is attached to the container 100. FIG. As shown in FIG. 22, when the valve device 200 </ b> F is attached to the container 100, the flat surface of the valve device 200 </ b> F is placed on the innermost layer surface of the packaging material 120. In this state, the valve device 200F does not roll. Therefore, according to the battery according to the seventh embodiment, the valve device 200F can be easily positioned when the valve device 200F is attached to the container 100. Further, in the battery state, the bulge of the peripheral joint portion 130 by the valve device 200F can be directed in the direction in which the container 100 swells, that is, the upward direction in which the molding portion 112 protrudes in FIG.

  The valve device 200F is an example of the “valve device” of the present invention, the valve function portion 210F is an example of the “first portion” of the present invention, and the seal attachment portion 220F is the “second device” of the present invention. It is an example of “part”. The air passage A4 is an example of the “air passage” in the present invention.

[8. Modified example]
As mentioned above, although Embodiment 1-7 was demonstrated, this invention is not limited to the said Embodiment 1-7, A various change is possible unless it deviates from the meaning. Hereinafter, modified examples will be described. However, the following modifications can be combined as appropriate.

<8-1>
In the first to seventh embodiments, the cross section of the seal attachment portion (the seal attachment portion 220 or the like) has a circular base shape. However, the cross-sectional shape of the seal attachment portion is not limited to this. For example, the cross-sectional shape of the seal attachment portion may have a shape based on a polygon.

  FIG. 23 is a view showing a cross section of the valve device 200G in the first modification. As shown in FIG. 23, in the valve device 200G, the cross section of the seal attachment portion 220G has a rhombus shape. In the seal attachment part 220G, the length L7 in the width direction of the battery is longer than the length L8 in the thickness direction of the battery. In this battery, the length in the thickness direction of the battery in the portion where the seal attachment portion 220G is sandwiched in the peripheral joint portion 130, and the thickness of the battery in the portion where the seal attachment portion 220G is not sandwiched in the peripheral joint portion 130. The difference from the direction length is smaller. Therefore, according to this battery, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire periphery of the container 100, and the opposite heat-fusible resin layer 35 can be appropriately fused. Therefore, the seal attachment portion 220G of the valve device 200G can be firmly fixed to the container 100.

  FIG. 24 is a view showing a cross section of the valve device 200H in the second modification. As shown in FIG. 24, in the valve device 200H, the cross section of the seal attachment portion 220H has a rhombus shape or a hexagonal shape chamfered at both ends in the thickness direction of the battery. In the seal attachment portion 220H, the length L9 in the width direction of the battery is longer than the length L10 in the thickness direction of the battery. In this battery, the length in the thickness direction of the battery at the portion where the seal attachment portion 220H is sandwiched in the peripheral joint portion 130, and the thickness of the battery at the portion where the seal attachment portion 220H is not sandwiched among the peripheral joint portion 130. The difference from the direction length is smaller. Therefore, according to this battery, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire periphery of the container 100, and the opposite heat-fusible resin layer 35 can be appropriately fused. Therefore, the seal attachment portion 220H of the valve device 200H can be firmly fixed to the container 100.

  FIG. 25 is a view showing a cross section of the valve device 200I in the third modification. As shown in FIG. 25, in the valve device 200I, the cross section of the seal attachment portion 220I has a shape in which wing-like extended ends 40I and 41I are provided at both ends of the rhombus (in the width direction of the battery). . In this battery, for example, as compared with the first embodiment (when the wing-like extended end portions 40I and 41I are not provided in the seal attachment portion 220I), the seal attachment portion 220I is not sandwiched between the peripheral joints 130. The change in the thickness direction of the battery at the transition from the portion to the portion where the seal attachment portion 220I is sandwiched in the peripheral joint 130 is smooth. Therefore, according to this battery, packaging is performed at the boundary between the position where the seal attachment portion 220I is sandwiched between the heat-fusible resin layers 35 and the position where the seal attachment portion 220I is not sandwiched between the heat-fusible resin layers 35. Since an excessive force is not applied to the materials 110 and 120, the seal mounting portion 220I of the valve device 200I can be firmly fixed to the container 100.

  FIG. 26 is a plan view of the valve device 200J according to the fourth modification. As shown in FIG. 26, the valve device 200J includes a valve function part 210J and a seal attachment part 220J. An air passage A5 is formed in the seal attachment portion 220J.

  27 is a sectional view taken along line XXVII-XXVII in FIG. This cross section can also be said to be a plane whose normal is the center line C1 of the air passage A5. As shown in FIG. 27, in the valve device 200J, the cross section of the seal attachment portion 220J has a hexagonal (polygonal) shape. R (for example, R = 0.2 mm to 2.0 mm) is formed at each corner of the hexagon. According to this battery, for example, it is possible to reduce the possibility that a portion of the seal attachment portion 220J located in the housing body 100 will damage the battery element 400 in the housing body 100, and of the seal attachment portion 220J. The portion sandwiched between the heat-fusible resin layers 35 can damage the heat-fusible resin layer 35 and reduce the possibility of reducing the insulating properties of the heat-fusible resin layer 35.

<8-2>
In the said Embodiment 1-7, the flange part 114 of the packaging material 110 was a flat state. However, the shape of the flange part 114 is not limited to this. For example, a valve device arrangement portion for arranging the seal attachment portion 220 of the valve device 200 may be formed in the flange portion 114 in advance.

  FIG. 28 is a plan view of the packaging material 110K in the fifth modification. As shown in FIG. 28, a valve device arrangement portion 116K is formed in the flange portion 114K.

  FIG. 29 is a sectional view taken along line XXIX-XXIX in FIG. As shown in FIG. 29, the valve device arrangement portion 116K formed on the flange portion 114K has a semicircular shape. The diameter of this semicircle is slightly longer than the diameter of the seal attachment portion 220, for example. For example, heat sealing at the periphery of the container is performed in a state in which the seal attachment portion 220 is disposed at the valve device placement portion 116K. Thereby, the deformation | transformation of the packaging material at the time of heat sealing is suppressed, and possibility that a pinhole and a tear will arise in the seal attachment part 220 vicinity can be reduced. The valve device arrangement portion 116K is not necessarily provided on the packaging material 110K, and may be provided on the packaging material 120. Even in this case, it is possible to obtain the same effect as when the valve device arrangement portion 116K is provided in the packaging material 110K.

<8-3>
In the first to seventh embodiments, only a part of the seal attachment portion (for example, the seal attachment portion 220) is sandwiched between the heat-fusible resin layers 35 at the peripheral joint portion 130. However, the mounting state of the seal mounting portion is not limited to this. For example, the entire seal attachment portion may be sandwiched between the heat-fusible resin layers 35 at the peripheral joint portion 130. Even in such a case, R is formed at the corner in a plan view of the end of the seal mounting portion (for example, the seal mounting portion 220) opposite to the valve function portion (for example, the valve function portion 210). Therefore, there is a low possibility that the end portion damages the heat-fusible resin layer 35 and lowers the insulating property of the heat-fusible resin layer 35.

<8-4>
In the first to seventh embodiments, in the valve device (for example, the valve device 200), there is a step at the boundary between the valve function unit (for example, the valve function unit 210) and the seal mounting unit (for example, the seal mounting unit 220). Was formed. However, a step is not necessarily formed at the boundary between the valve function part and the seal attachment part. For example, the diameter of the cross section of the valve function portion and the diameter of the cross section of the seal attachment portion may be the same, and the valve function portion and the seal attachment portion may be connected flat.

<8-5>
In the first to seventh embodiments, the cross section of the air passage (for example, the air passage A1) formed in the seal attachment portion (the seal attachment portion 220 or the like) has a circular base shape. However, the cross-sectional shape of the air passage is not limited to this. For example, the cross-sectional shape of the air passage may be a shape based on a polygon.

<8-6>
In the said Embodiment 1-7, R was formed in the corner | angular part of the edge part on the opposite side to the valve function part (for example, valve function part 210) of a seal attachment part (for example, seal attachment part 220). However, R is not necessarily formed at the corner.

<8-7>
In the first to seventh embodiments, the valve device (for example, the valve device 200) is a so-called return valve. However, the valve device does not necessarily have to be a return valve. The valve device may be, for example, a so-called destruction valve or a selective permeation valve.

<8-8>
Referring to FIG. 1 again, in Embodiments 1 to 7 above, tabs 300 are provided at both ends of container 100 in the direction of arrow LR, and the valve device (for example, valve device 200) is an arrow of container 100. It was provided at the end in the F direction. However, the positional relationship between the valve device 200 and the tab 300 is not limited to this. For example, both tabs 300 may be disposed on the same side of the periphery of the container 100 and the valve device may be disposed between the two tabs 300, or both tabs 300 may be the same on the periphery of the container 100. The valve device may be arranged on any one of the three sides other than the side where the tab 300 is arranged.

<8-9>
In the said Embodiment 1-7, the container 100 contained the packaging material 110 shape | molded by embossing etc., and the packaging material 120 separate from the packaging material 110. FIG. However, the container 100 does not necessarily have such a configuration.

  For example, the packaging material 110 and the packaging material 120 may be integrated (connected) in advance on one side. In this case, at the end of the flange portion 114 of the packaging material 110, the packaging material 110 and the packaging material 120 are integrated (connected), and the packaging material 110 and the packaging material 120 are stacked. The battery element 400 may be sealed in the container 100 by performing four-way sealing. Further, the flange portion 114 is omitted at the side where the packaging material 110 and the packaging material 120 are integrated, and the container 100 is sealed by three-way sealing in a state where the packaging material 110 and the packaging material 120 are overlapped. The battery element 400 may be sealed inside.

  For example, the packaging material 120 may be formed in the same shape as the packaging material 110. The container 100 may be, for example, a pouch type container. The pouch-type container may be any type such as a three-side seal type, a four-side seal type, a pillow type, and a gusset type.

<8-10>
In the first to seventh embodiments, the casing of the valve function unit (for example, the valve function unit 210) and the casing of the seal mounting unit (for example, the seal mounting unit 220) are formed of the same material (resin). It was. However, the casing of the valve function portion and the casing of the seal attachment portion do not necessarily need to be formed of the same material. For example, the casing of the valve function part and the casing of the seal attachment part may be made of different materials, and the melting point of the material of the valve function part may be higher than the melting point of the material of the seal attachment part. For example, the valve function part is made of polypropylene (PP), and the seal mounting part is made of resin (for example, fluorine resin, polyester resin, polyimide resin, polycarbonate resin, acrylic resin) or metal having a melting point higher than PP. May be. As the resin used for the seal mounting portion, a fluororesin having a high barrier is preferable.

  In this battery, even if pressure and heat are applied to the seal mounting portion when the opposing heat-fusible resin layer 35 is fused, the melting point of the material of the valve function portion is higher than the melting point of the material of the seal mounting portion. Therefore, the possibility that the valve function part is deformed by heat is low. Therefore, according to this battery, it is possible to suppress a failure of the valve mechanism in the valve function portion when the opposing heat-fusible resin layer 35 is fused.

<8-11>
In the first to seventh embodiments, the casing of the valve device 200 is made of resin, and the seal attachment portion 220 is directly sandwiched between the heat-fusible resin layers 35. However, the casing of the valve device 200 is not necessarily made of resin, and may be made of metal (for example, aluminum or stainless steel), for example. In this case, an adhesive protective film may be disposed between the seal attachment portion 220 and the heat-fusible resin layer 35. The adhesive protective film is configured such that one surface adheres to at least the resin, and the other surface adheres to at least the metal. As the adhesive protective film, various known adhesive protective films can be employed. For example, the same adhesive protective film as the tab film 310 can be used.

<8-12>
In the first to seventh embodiments, the outer peripheral side of the seal attachment portion (for example, the seal attachment portion 220) (the corner of the end portion of the seal attachment portion opposite to the valve function portion (for example, the valve function portion 210) side) R was formed, but R was not formed on the inner peripheral side (the edge of the air passage (for example, air passage A1)) of the seal mounting portion. However, R may be formed on the inner peripheral side of the seal mounting portion. By forming R on the inner peripheral side of the seal mounting portion, the possibility of dust (for example, resin, metal, etc.) falling into the container 100 due to shaving of the corner on the inner peripheral side of the seal mounting portion is reduced. be able to.

<8-13>
Referring to FIG. 21 again, in the seventh embodiment, flat surfaces are formed on the outer surfaces of both valve function portion 210F and seal attachment portion 220F. However, a flat surface is not necessarily formed on the outer surfaces of both the valve function part 210F and the seal attachment part 220F. A flat surface may be formed on at least one outer surface of the valve function part 210F and the seal attachment part 220F.

<8-14>
Moreover, although the battery 10 of the said Embodiments 1-7 is a secondary battery, since it defines with the concept of what outputs electricity, for example, a capacitor, an electric double layer capacitor (EDLC), lithium It also includes power storage devices such as ion capacitors, and the types of secondary batteries are not particularly limited. For example, lithium ion batteries, lithium ion polymer batteries, lead live batteries, nickel / hydrogen live batteries, nickel Examples include cadmium livestock batteries, nickel / iron livestock batteries, nickel / zinc livestock batteries, silver oxide / zinc livestock batteries, metal-air batteries, multivalent cation batteries, and all solid state batteries.

  DESCRIPTION OF SYMBOLS 10 Battery, 31 Base material layer, 32 Adhesive layer, 33 Barrier layer, 34 Adhesive layer, 35 Heat-fusion resin layer, 40, 40I, 41, 41I Wing extension part, 50, 51 pillar, 60 Projection , 100 container, 110, 110K, 120 packaging material, 112 molding part, 114, 114K flange part, 116K valve device arrangement part, 130 peripheral joint part, 200, 200A, 200B, 200C, 200D, 200E, 200F, 200G, 200H, 200I, 200J Valve device, 210, 210A, 210B, 210C, 210E, 210F, 210G, 210H, 210I, 210J Valve functional part, 212 O-ring, 214 ball, 216 spring, 218 membrane, 220, 220A, 220B, 220C, 220D, 220E, 220F, 220G, 20H, 220I, 220 J seal mounting portion, 300 tabs 310 tabs film, 400 battery element, A1, A2, A3, A4, A5 air passage, C1 centerline, O1 outlet.

Claims (13)

A battery element;
At least a base body layer, a barrier layer, and a heat-fusible resin layer are formed in this order, and a container that houses the battery element therein;
A valve device communicating with the inside of the container,
At the periphery of the container, the heat-fusible resin layer is opposed,
The peripheral edge of the container is formed with a peripheral joint where the opposing heat-fusible resin layers are fused together,
The valve device is
A first portion having a valve mechanism formed therein for reducing the pressure when the pressure inside the container rises due to the gas generated inside the container;
A second portion having a ventilation path formed therein for guiding the gas generated in the container to the valve mechanism;
The first portion is located outside the edge of the peripheral edge joint,
The battery, wherein at least a part of the second portion is sandwiched between the heat-fusible resin layers at the peripheral joint portion. In the thickness direction of the battery, the length of the first portion is longer than the length of the second portion,
The battery according to claim 1, wherein a step is formed at a boundary between the first portion and the second portion.   The battery according to claim 1 or 2, wherein a length of the second part in the width direction of the battery is longer than a length of the second part in a thickness direction of the battery.   The battery according to any one of claims 1 to 3, wherein the second portion has a wing-shaped extended end portion formed so as to be closer to an end portion in the width direction of the battery.   The battery according to any one of claims 1 to 4, wherein a cross-sectional shape of the air passage is circular.   The battery according to any one of claims 1 to 4, wherein a length of a cross section of the air passage in a width direction of the battery is longer than a length of a cross section of the air passage in a thickness direction of the battery.   The battery according to any one of claims 1 to 6, wherein the second portion includes a pillar formed in the air passage.   The battery according to any one of claims 1 to 7, wherein an outer surface of the second portion is a pear ground.   The battery according to any one of claims 1 to 7, wherein at least one protruding strip portion extending in a circumferential direction is formed on an outer surface of the second portion.   10. The battery according to claim 1, wherein, in the second portion, a corner in a plan view of an end portion opposite to the first portion side is rounded. The outer shape of the cross section of the second part with the center line of the air passage as a normal line is a polygon,
The battery according to claim 1, wherein corners of the polygon are rounded. Each of the first and second portions is composed of a different material;
The battery according to any one of claims 1 to 11, wherein a melting point of the material of the first part is higher than a melting point of the material of the second part.   The battery according to any one of claims 1 to 12, wherein a flat surface is formed on at least a part of an outer surface of at least one of the first and second portions.