JP6653038B1 - Valve structure for power storage device - Google Patents

Abstract

A valve structure for an electricity storage device that is easily attached to a container is provided. A valve structure attached to a container is provided. The valve structure is for an electricity storage device, and has a casing in which a passage for discharging gas generated inside the container to the outside of the container is formed. A valve mechanism for passing gas to the outside of the container via the passage when the internal pressure of the container increases. The casing includes a first plane and a second plane parallel to the first plane. [Selection diagram] FIG.

Description

  The present invention relates to a power storage device valve structure and a power storage device including the same.

  Patent Literature 1 discloses a pouch type lithium secondary battery. In this battery, a valve structure for degassing is attached to a peripheral seal formed along a peripheral edge of a bag accommodating a battery element. This valve structure can suppress the deformation of the shape of the bag by discharging the gas generated in the bag.

JP 2016-31934 A

  The attachment of the valve structure to the peripheral seal portion as in Patent Document 1 is typically performed by sandwiching the valve structure with a packaging material forming a bag and heat sealing the valve structure together with the packaging material. . Also, typically, the valve structure is transported to a processing position where heat sealing is performed while being held by a holding tool or the like included in a jig, and is fixed at the processing position during heat sealing. However, in the valve structure of Patent Literature 1, a portion protruding from the peripheral seal portion to the outside of the bag has a columnar shape. In this case, it is difficult to firmly hold the valve structure, and therefore, for example, it may be difficult to transport the valve structure to the processing position or to fix the valve structure at the processing position. Can be difficult to attach to

  An object of the present invention is to provide a power storage device valve structure that can be easily attached to a container, and a power storage device including the same.

  A power storage device valve structure according to a first aspect of the present invention is a valve structure attached to a container, wherein a casing formed with a passage for discharging gas generated inside the container to the outside of the container is provided. A valve mechanism that is held by the casing and that passes the gas to the outside of the container through the passage when the internal pressure of the container increases due to the gas generated inside the container. Prepare. The casing includes a first plane and a second plane parallel to the first plane.

  A power storage device valve structure according to a second aspect of the present invention is the valve structure according to the first aspect, wherein the casing has a first ventilation path included in the passage, and inside the container. A first portion is fixed to the container so that the generated gas flows into the first ventilation path.

  A valve structure for a power storage device according to a third aspect of the present invention is the valve structure according to the second aspect, wherein the casing is included in the passage, and is located outside of the container with respect to the first ventilation path. A second portion that holds the valve mechanism, and a third portion that is included in the passage and that is located outside the container with respect to the first passage. And a third portion including the first plane and the second plane.

  The valve structure for a power storage device according to a fourth aspect of the present invention is the valve structure according to the third aspect, wherein the third ventilation path is located closer to the inside of the container than the second ventilation path. .

  A power storage device valve structure according to a fifth aspect of the present invention is the valve structure according to any of the second to fourth aspects, wherein the first portion extends in a direction in which the first ventilation path extends. It is non-circular when viewed along.

  A power storage device valve structure according to a sixth aspect of the present invention is the valve structure according to any one of the second to fifth aspects, wherein the first portion extends in a direction in which the first ventilation path extends. When viewed along, it has a first wing-shaped portion formed thinner in the first direction from the central portion, and a second wing-shaped portion formed thinner in the second direction opposite to the first direction. .

  The valve structure for a power storage device according to a seventh aspect of the present invention is the valve structure according to the sixth aspect, wherein the first plane and the second plane are parallel to the first direction and the second direction. Or vertical.

  An electricity storage device according to an eighth aspect of the present invention is formed of a packaging material, and has a container having an internal space, a peripheral sealing portion that defines a peripheral edge of the internal space, and is housed in the internal space of the container. A battery element; and a valve structure attached to the peripheral edge seal portion. The valve structure has a casing in which a passage for discharging gas generated inside the container to the outside of the container is formed, and the valve structure is held by the casing, and the valve structure is formed due to the gas generated inside the container. A valve mechanism for passing the gas to the outside of the container via the passage when the internal pressure of the container increases. The casing includes a first plane and a second plane parallel to the first plane.

  A power storage device according to a ninth aspect of the present invention is the power storage device according to the eighth aspect, wherein the first plane and the second plane are parallel or perpendicular to a direction in which the peripheral seal portion extends.

  According to the present invention, the casing of the valve structure for a power storage device includes a pair of parallel planes (a first plane and a second plane). Such a pair of planes makes it easier to grip the valve structure, so that, for example, the valve structure can be easily transported to the processing position or fixed at the processing position. As a result, attachment of the valve structure to the container can be facilitated.

The top view of the electric storage device provided with the valve structure for electric storage devices concerning one embodiment of the present invention. II-II sectional drawing of FIG. The top view of a valve structure. The figure which looked at the valve structure from the back side. The figure which looked at the valve structure from the front side. VI-VI sectional drawing of FIG. VII-VII sectional drawing of FIG. The figure explaining the attachment method of the valve structure to a container. Another figure explaining the attachment method of the valve structure to a container. FIG. 9 is yet another view illustrating a method of attaching the valve structure to the container. Sectional drawing of the valve structure which concerns on a certain modification. The figure which shows the release valve contained in the valve structure which concerns on a certain modification. The figure which looked at the valve structure concerning another modification from the back side. The top view of the valve structure which concerns on another modification. The figure which looked at the valve structure concerning another modification from the back side. The figure which looked at the valve structure concerning another modification from the back side. The figure which looked at the valve structure concerning another modification from the back side. Sectional drawing of the valve structure which concerns on another modification. Sectional drawing of the valve structure which concerns on another modification.

  Hereinafter, a valve structure for a power storage device according to an embodiment of the present invention and a power storage device including the same will be described with reference to the drawings.

<1. Overall configuration of power storage device>
FIG. 1 shows a plan view of an electric storage device 1 according to the present embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. In these figures, parts that cannot be visually recognized from the outside are partially indicated by dotted lines for reference. In the following description, for convenience of description, the vertical direction in FIG. 1 is referred to as “back and forth”, the horizontal direction is referred to as “left and right”, and the vertical direction in FIG. However, the orientation when the power storage device 1 is used is not limited to this.

  The power storage device 1 includes a housing 101 and a battery element 400 housed therein. The container 101 includes a container 100, a tab 300 and a tab film 310 attached to the container 100. Battery element 400 is housed in internal space S1 of container 100.

  The container 100 is composed of packaging materials 110 and 120. In the outer peripheral portion of the container 100 in a plan view, the packaging materials 110 and 120 are heat-sealed and fused to each other, thereby forming a peripheral seal portion 130. The peripheral seal 130 forms an internal space S1 of the container 100 that is isolated from the external space. The peripheral seal portion 130 defines a peripheral edge of the internal space S1 of the container 100. The form of heat sealing here is assumed to be such as heat welding from a heat source, ultrasonic welding, or the like. In any case, the peripheral seal portion 130 means a portion where the packaging materials 110 and 120 are fused and integrated.

  The packaging materials 110 and 120 are made of, for example, a resin molded product or a film. The resin molded article here can be produced by a method such as injection molding, air pressure molding, vacuum molding, blow molding, or the like, and may be subjected to in-mold molding in order to impart designability and functionality. The type of resin can be polyolefin, polyester, nylon, ABS, or the like. The film referred to herein is, for example, a plastic film that can be manufactured by a method such as an inflation method or a T-die method, or a film obtained by laminating such a plastic film on a metal foil. The film referred to here may or may not be stretched, and may be a single-layer film or a laminated film. In addition, the laminated film referred to herein may be manufactured by a coating method, a film obtained by bonding a plurality of films with an adhesive or the like, or may be manufactured by a multilayer extrusion method.

  As described above, the packaging materials 110 and 120 can be variously configured. In the present embodiment, the packaging materials 110 and 120 are configured by a laminate film. The laminate film can be a laminate in which a substrate layer, a barrier layer, and a heat-fusible resin layer are laminated. The base material layer functions as a base material of the packaging materials 110 and 120, and typically forms an outer layer side of the container 100 and is an insulating resin layer. The barrier layer has a function of preventing the penetration of at least moisture into the power storage device 1 in addition to improving the strength of the packaging materials 110 and 120, and is typically a metal layer made of an aluminum alloy or the like. The heat-fusible resin layer is typically made of a heat-fusible resin such as polyolefin, and forms the innermost layer of the container 100.

  The shape of the container 100 is not particularly limited, and may be, for example, a bag shape (pouch shape). The bag shape here may be a three-sided seal type, a four-sided seal type, a pillow type, a gusset type, or the like. However, the container 100 of the present embodiment has a shape as shown in FIG. 2, and a packaging material 110 molded in a tray shape and a packaging material 120 similarly molded in a tray shape and superimposed on the packaging material 110. Are heat-sealed along the outer peripheral portion in plan view. The packaging material 110 includes an annular flange portion 114 corresponding to an outer peripheral portion in a plan view, and a molded portion 112 which is continuous with an inner edge of the flange portion 114 and bulges downward therefrom. Similarly, the packaging material 120 includes an annular flange portion 124 corresponding to an outer peripheral portion in a plan view, and a formed portion 122 which is continuous with an inner edge of the flange portion 124 and bulges upward therefrom. The packaging material 110 and the packaging material 120 are overlapped so that the respective molded portions 112 and 122 bulge in opposite directions. In this state, the flange portion 114 of the packaging material 110 and the flange portion 124 of the packaging material 120 are heat-sealed so as to be integrated, thereby forming the peripheral edge seal portion 130. The peripheral edge seal portion 130 extends over the entire outer periphery of the container 100 and is formed in a square ring shape. Note that one of the packaging material 110 and the packaging material 120 may be in the form of a sheet.

  The battery element 400 is, for example, a power storage member such as a lithium ion battery (secondary battery) or a capacitor, and includes an electrolytic solution. If an abnormality occurs in the battery element 400, gas may be generated in the internal space S1 of the container 100. When the battery element 400 is a capacitor, a gas may be generated in the internal space S1 of the container 100 due to a chemical reaction in the capacitor. Further, power storage device 1 may be an all-solid-state battery, and in this case, battery element 400 may include a solid electrolyte capable of generating gas. For example, when the solid electrolyte is of a sulfide type, hydrogen sulfide gas may be generated.

  The tab 300 is a metal terminal used for input / output of power in the battery element 400. The tab 300 is disposed separately at the left and right ends of the peripheral seal portion 130 of the container 100, one of which constitutes a positive terminal and the other constitutes a negative terminal. One end of each tab 300 in the left-right direction is electrically connected to the electrode (positive electrode or negative electrode) of the battery element 400 in the internal space S1 of the container 100, and the other end is connected to the peripheral seal portion 130. It protrudes outward. The above-described embodiment of the power storage device 1 is particularly preferable, for example, for use in an electric vehicle such as an electric vehicle or a hybrid vehicle that uses a plurality of power storage devices 1 connected in series and uses a high voltage. In addition, the mounting position of the two tabs 300 constituting the terminals of the positive electrode and the negative electrode is not particularly limited. For example, the two tabs 300 may be arranged on the same one side of the peripheral seal portion 130.

  The metal material forming the tab 300 is, for example, aluminum, nickel, copper, or the like. When the battery element 400 is a lithium ion battery, the tab 300 connected to the positive electrode is typically made of aluminum or the like, and the tab 300 connected to the negative electrode is typically made of copper, nickel, or the like. Be composed.

  The left tab 300 is sandwiched between the packaging materials 110 and 120 via the tab film 310 at the left end of the peripheral edge seal portion 130. The right tab 300 is also sandwiched between the packaging materials 110 and 120 via the tab film 310 at the right end of the peripheral edge seal portion 130.

  The tab film 310 is a so-called adhesive film, and is configured to adhere to both the packaging materials 110 and 120 and the tab 300 (metal). By interposing the tab film 310, even if the tab 300 and the innermost layer (heat-fusible resin layer) of the packaging materials 110 and 120 are made of different materials, both can be fixed.

  When gas is generated in the internal space S1 of the container 100 with the operation of the power storage device 1, the pressure in the internal space S1 gradually increases. If the pressure in the internal space S1 rises excessively, the container 100 may burst, and the power storage device 1 may be destroyed. The container 101 includes a valve structure 200 as a mechanism for preventing such a situation. The valve structure 200 is a gas vent valve for adjusting the pressure in the internal space S <b> 1, and is attached to the peripheral seal 130 of the container 100. Hereinafter, the configuration of the valve structure 200 will be described in detail.

<2. Configuration of Valve Structure>
FIG. 3 is a plan view of the valve structure 200. FIG. As shown in the figure, the valve structure 200 has a casing 201, and the casing 201 includes a first portion 10, a second portion 20, and a third portion 30. In this embodiment, these portions 10 to 30 are continuous in the direction from the inside of the container 100 to the outside (the direction from the rear side to the front side) in the order of the first portion 10, the third portion 30, and the second portion 20. Placed. FIG. 4 is a view of the valve structure 200 viewed from the first portion 10 side (from the rear side), and FIG. 5 is a view of the valve structure 200 viewed from the second portion 20 side (from the front side). .

  FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, and FIG. 7 is a sectional view taken along line VII-VII of FIG. As shown in FIGS. 6 and 7, the valve structure 200 of the present embodiment is a check valve capable of repeatedly venting gas, and is particularly a ball spring type check valve. The valve structure 200 is a relief valve that switches between an open state and a closed state according to the pressure in the internal space S1. A passage L1 is formed inside the casing 201. The passage L1 has an inlet O1 facing the inner space S1 of the container 100 and an outlet O2 facing the outer space. The passage L1 allows the internal space S1 of the container 100 to communicate with the external space when the valve structure 200 is in the open state, and discharges gas generated in the internal space S1 to the outside of the container 100. The valve structure 200 is opened when the pressure in the internal space S1 increases due to the gas generated in the internal space S1. On the other hand, in the closed state, the valve structure 200 seals the internal space S1 from the external space.

  The first part 10 is a part for attaching the valve structure 200 to the container 100. The first part 10 is heat-sealed with the packaging materials 110 and 120 when the container 100 is formed. By this heat sealing, the outer peripheral surface of the first portion 10 and the packaging materials 110 and 120 are fused and joined, and the first portion 10 is attached to the peripheral edge seal portion 130 in a manner sandwiched between the packaging materials 110 and 120. It is fixed (see FIG. 2).

  The third portion 30 is disposed outside the peripheral seal portion 130 and is not sandwiched between the packaging materials 110 and 120 (see FIGS. 1 and 2). Further, the second portion 20 disposed further outside than the third portion 30 is also disposed outside the peripheral seal portion 130 and is not sandwiched between the packaging materials 110 and 120. As a result, the risk that various parts constituting the valve mechanism, which will be described later, and which are held by the second part 20, are broken by deformation or the like due to heat when the first part 10 is attached to the container 100 by heat sealing is reduced. You.

  The first portion 10, the second portion 20, and the third portion 30 extend coaxially and parallel to each other in a front-rear direction (including a case where they are substantially parallel; the same applies hereinafter). Here, the central axis common to these portions 10 to 30 is represented by reference numeral C1. The first part 10 has a first ventilation path A1, the second part 20 has a second ventilation path A2, and the third part 30 has a third ventilation path A3. These air passages A1 to A3 also extend coaxially and parallel to the front-rear direction with the central axis C1 as the central axis. In the present embodiment, the inlet O1 and the outlet O2 are arranged not on the outer peripheral surface of the casing 201 but on the end face in the front-rear direction. Pass through the center. Although not limited to this, the cross section orthogonal to the central axis C1 of the ventilation paths A1 to A3 is circular. The air passages A1 to A3 communicate with each other and constitute a passage L1 as a whole. The third ventilation path A3 is disposed outside the container 100 with respect to the first ventilation path A1, and the second ventilation path A2 is disposed further outside the container 100 than the third ventilation path A3. In other words, the third ventilation path A3 is disposed on the inner side of the container 100 with respect to the second ventilation path A2, and the first ventilation path A1 is disposed on the inner side of the container 100 with respect to the third ventilation path A3. .

  As shown in FIGS. 4 and 5, the outer shape of the second portion 20 is substantially a column shape having the central axis C <b> 1 as the central axis. On the other hand, as shown in FIG. 4, the outer shape of the third portion 30 has a shape in which a part of a cylinder having the central axis C1 as a central axis is cut away. More specifically, the outer shape of the third portion 30 is generally formed by cutting out a cylinder having the central axis C1 as a central axis at a plane spaced at a fixed distance from the central axis C1. It has a shape that is further notched in a plane symmetrical to the position. Therefore, the third portion 30 has a pair of planes D1 and D2. Hereinafter, the plane indicated by D1 may be referred to as a first plane, and the plane indicated by D2 may be referred to as a second plane. The first plane D1 and the second plane D2 are parallel to each other (including a case where they are substantially parallel. The same applies to the following.). The first plane D1 and the second plane D2 are parallel to the direction in which the central axis C1 extends (including the case where they are substantially parallel. The same applies hereinafter). In the present embodiment, the first plane D1 and the second plane D2 are parallel to the direction in which the peripheral edge seal portion 130 extends (including the case where they are substantially parallel; the same applies to the following). The outer peripheral surface of the third portion 30 includes a first plane D1 and a second plane D2, and curved planes D3 and D4 connecting the planes D1 and D2. Each of the curved surfaces D3 and D4 has an arc shape centered on the central axis C1 when viewed along the direction in which the central axis C1 extends, and overlaps the outer shape of the second portion 20. The second portion 20 as described above can be formed by cutting the outer peripheral surface of the cylindrical member so that a pair of planes D1 and D2 are formed.

  As shown in FIG. 4, the first portion 10 has a non-circular outer shape when viewed along the direction in which the central axis C1 extends. More specifically, when viewed along the direction in which the central axis C1 extends, the first portion 10 includes a first wing-shaped portion 41 that is formed thinner from the center in the left-right direction to the left, and The second wing portion 42 is formed so as to become thinner toward it. Therefore, in the present embodiment, the first portion 10 becomes thicker as approaching the central portion in the width direction (lateral direction) of the power storage device 1 and becomes thinner as approaching the end portion in the width direction (lateral direction) of the power storage device 1. .

  In the present embodiment, the outer peripheral surface of the first portion 10 has a smooth curved surface both in the lower half covered with the packaging material 110 and in the upper half covered with the packaging material 120 by the wings 41 and 42. I'm drawing. Further, due to the wing portions 41 and 42, for example, as compared with a case where the first portion 10 is formed in a cylindrical shape, a portion of the peripheral seal portion 130 where the first portion 10 is not sandwiched is a portion of the peripheral seal portion 130. At the position where the transition to the portion where the one portion 10 is sandwiched, the change in the thickness of the power storage device 1 in the vertical direction becomes smooth. As a result, in the peripheral portion of the peripheral seal portion 130 at the position where the first portion 10 is attached, no excessive force is applied to the packaging materials 110 and 120, so that the first portion 10 is firmly fixed to the peripheral seal portion 130. can do.

  As described above, in the present embodiment, the outer shapes of the first portion 10, the second portion 20, and the third portion 30 are assigned to the respective portions when viewed along the direction in which the central axis C1 extends. Each have a different shape.

  The second part 20 holds the valve mechanism. When the pressure in the internal space S1 increases due to the gas generated in the internal space S1 of the container 100, the valve mechanism allows the gas that has passed through the first ventilation path A1 and the third ventilation path A3 to pass through the second ventilation path. The liquid is passed to the outside of the container 100 via the path A2. That is, the second portion 20 holds a portion having a main structure for exhibiting the function of the valve structure 200 as a gas release valve. In the present embodiment, a spring 212, a ball 213, and a valve seat 214 as a valve mechanism are housed in the second ventilation path A2 inside the second portion 20. An insertion portion 215 that is continuous with the third portion 30 is also accommodated in the second ventilation path A2. These parts 212 to 215 are arranged in this order from the outlet O2 to the inlet O1 in the second ventilation path A2. In the present embodiment, the second portion 20, the valve seat 214, and the insertion portion 215 are configured as separate components, but at least a portion thereof may be integrally configured. Further, in the present embodiment, as shown in FIGS. 6 and 7, the insertion portion 215 is integrally formed with the third portion 30 and the first portion 10, but at least a part thereof is formed as a separate component. May be done.

  The valve seat 214 receives the ball 213 as a valve body biased from the outside by the spring 212, and at this time, the closed state of the valve structure 200 is formed. The spring 212 is a coil spring in the examples of FIGS. 6 and 7, but is not limited thereto, and may be, for example, a leaf spring.

  The first portion 10 is fixed to the peripheral seal portion 130 so that gas generated in the internal space S1 of the container 100 flows into the first ventilation path A1. That is, the first ventilation path A1 inside the first portion 10 communicates with the internal space S1 of the container 100. Therefore, when the pressure in the internal space S1, that is, the pressure in the first ventilation path A1 and the third ventilation path A3 communicating therewith reaches a predetermined pressure, it flows out of the internal space S1, and the first ventilation path A1 and the third The gas that has passed through the three ventilation paths A3 presses the ball 213 toward the outlet O2. When the ball 213 is pressed and separated from the valve seat 214, the spring 212 is deformed, the ball 213 moves to the outlet O2 side, and the open state of the valve structure 200 is formed. In this open state, the gas generated in the internal space S1 flows toward the outlet O2 through a gap formed between the ball 213 and the valve seat 214, and is discharged to the external space via the outlet O2. . Thus, when the gas in the internal space S1 is exhausted through the passage L1, the force pressing the ball 213 toward the outlet O2 is weakened, and the spring 212 urges the ball 213 toward the inlet O1. The force to do it increases. As a result, the shape of the spring 212 is restored, and the closed state of the valve structure 200 is formed again.

  In the closed state, the valve structure 200 can prevent air from entering the internal space S1 of the container 100. On the other hand, even in the open state, the entry of the atmosphere into the internal space S1 hardly occurs. This is because, in the open state, the pressure in the internal space S1 is higher than or equal to the pressure in the external space. Therefore, the valve structure 200 can effectively prevent air from entering the container 100 and prevent the battery element 400 from deteriorating due to moisture or the like contained therein.

  The material forming each part of the valve structure 200 is not particularly limited. As a preferred example, the ball 213 can be made of a fluororesin and the valve seat 214 can be made of a fluororubber. Further, the spring 212 may be made of metal such as stainless steel, and the first portion 10, the second portion 20, the third portion 30, and the insertion portion 215 may be made of metal such as aluminum alloy, stainless steel, steel plate, and titanium. Also, the first part 10 may be made of a material that directly adheres to the innermost layers of the packaging materials 110 and 120. For example, the first portion 10 can be made of a material having the same heat sealability as the innermost layers of the packaging materials 110 and 120, for example, a resin such as polyolefin. If the first portion 10 cannot be made of the above material due to heat resistance or the like, for example, if the first portion 10 is made of metal, the first portion 10 and the These can be bonded via a film that can be bonded to both the inner layer.

  The valve seat 214 and the insertion portion 215 can be bonded with an adhesive. Although the material of the adhesive is not particularly limited, a preferable example in the case where the valve seat 214 is made of fluororubber and the insertion portion 215 is made of metal such as aluminum can be made of an acid-modified polyolefin and an epoxy resin. . Such an adhesive is superior to, for example, a case where an adhesive made of a modified silicone resin is used, in that it can suppress deterioration of the adhesive performance due to the electrolytic solution. In addition, from the viewpoint of preventing the valve structure 200 from being opened, an adhesive can be appropriately applied to other various places. For example, an adhesive can be applied between the rear end surface of the second portion 20 and the front end surface of the third portion 30.

  In addition, it is preferable that the surface of the first portion 10 is coated with a corrosion inhibitor to form a corrosion prevention coating layer, particularly from the viewpoint of resistance to electrolyte. Note that this applies particularly when the first portion 10 is made of a metal such as aluminum, but may also apply when the first portion 10 is made of another material. Such a coating can be applied by immersing the first part 10 in a liquid of a corrosion inhibitor. As a result, a corrosion prevention coating layer can be formed on the outer surface of the first portion 10 and the inner surface facing the first air passage A1, and the corrosion of the outer surface by the released gas and the first air passage A1 can be formed. Can prevent corrosion of the inner surface by gas passing through. In addition, from the viewpoint of resistance to electrolytic solution, not only the first portion 10 but also the surfaces of the third portion 30, the second portion 20, and the insertion portion 215 are coated in the same manner to form a corrosion prevention coating layer. You may. However, from the viewpoint of suppressing the deterioration of the adhesion performance between the first portion 10 and the packaging materials 110 and 120 due to the electrolytic solution, it is particularly significant to apply such a coating to the first portion 10. The material of the corrosion inhibitor is not particularly limited, but is preferably an acid-resistant material. The corrosion prevention coating layer can be formed by a phosphoric acid chromate treatment or the like.

<3. Mounting method of valve structure>
Next, a method of attaching the valve structure 200 to the container 100 will be described. First, the packaging materials 110 and 120 are fixed in a state where they face each other by a fixing tool (not shown). Further, the valve structure 200 is gripped by the gripper 501 of the jig 500 (see FIG. 8A). At this time, the valve structure 200 is moved in such a manner that the gripper 501 firmly contacts the first plane D1 and the second plane D2 of the third part 30 and the third part 30 is firmly sandwiched by the gripper 501. Is grasped. 8A to 8C, in order to focus on the description of the mounting of the valve structure 200, the molding portions 112 and 122 of the packaging materials 110 and 120 are not particularly illustrated. It is formed appropriately before, during or after the valve structure 200 is mounted.

  In the above state, the jig 500 is driven, the valve structure 200 gripped by the gripper 501 moves, and the first portion 10 enters the gap between the packaging materials 110 and 120 facing each other (see FIG. 8B). ). At this time, the valve structure 200 is moved so that the third portion 30 does not enter the gap. Therefore, the first portion 10 is sandwiched between the outer peripheral portions of the packaging materials 110 and 120. Also, at this time, the valve structure 200 is moved so that the portions to be the peripheral seal portions 130 in the packaging materials 110 and 120 are parallel to the first plane D1 and the second plane D2 of the third portion 30. .

  In the above state, the pair of heated seal bars 600 sandwich the outer peripheral portions of the packaging materials 110 and 120 from outside (see FIG. 8C). As a result, the outer peripheral portions of the packaging materials 110 and 120 receive the heat from the seal bar 600 and are fused to form the peripheral seal portion 130. As described above, the valve structure 200 is fixed to the peripheral seal portion 130 such that only the first portion 10 of the valve structure 200 is sandwiched between the packaging materials 110 and 120. At this time, the wing-shaped portions 41 and 42 included in the first portion 10 are fixed without the lines connecting the sharp ends being inclined with respect to the extending direction (left-right direction) of the peripheral seal portion 130. Thereafter, the pair of seal bars 600 retreat to a predetermined position, and the gripper 501 releases the valve structure 200 and retreats to the predetermined position.

  In the above steps, the gripper 501 can firmly grip the valve structure 200 using the pair of parallel first and second planes D1 and D2. Therefore, the valve structure 200 can be accurately conveyed to the desired position with respect to the packaging materials 110 and 120. Further, during the heat sealing, the valve structure 200 can be firmly fixed to a desired position with respect to the packaging materials 110 and 120. That is, the valve structure 200 can be accurately positioned with respect to the container 100. Note that the positioning here includes adjusting the phase around the central axis C1 of the valve structure 200. That is, the angle of the first portion 10 around the central axis C1 with respect to the peripheral seal portion 130 of the container 100 can be accurately adjusted. According to the above configuration, attachment of the valve structure 200 to the container 100 can be facilitated.

<4. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to said Embodiment, A various change is possible unless it deviates from the meaning. For example, the following changes are possible. Further, the gist of the following modified examples can be appropriately combined.

<4-1>
The valve structure 200 of the above embodiment is a ball spring type, but is not limited to this. For example, a poppet type, a duck bill type, an umbrella type, a diaphragm type, or the like can be used. Further, the valve structure 200 of the above-described embodiment is a check valve capable of repeatedly degassing, but may be a release valve capable of degassing only once. Further, both the check valve and the release valve may be included.

  The release valve referred to in the present modified example can be variously configured. For example, as shown in FIG. 9A, a release valve can be configured by a thin plate or a film 250 as a valve mechanism held by the casing 201 so as to close the passage L1 in the valve structure 200. The release valve (hereinafter, the release valve is denoted by reference numeral 250) can be configured by, for example, attaching a laminate film to the casing 201 by heat sealing so as to cover the outlet O2. In this example, when the pressure in the internal space S1 of the container 100 rises, the release film 250, which is the release film, is peeled off to open the valve. As another example, the release valve 250 may be a thin plate made of metal such as aluminum, and a cutout portion 251 extending radially from the vicinity of the center thereof may be formed in the thin plate as shown in FIG. 9B. The notch 251 does not penetrate the release valve 250 in the thickness direction, and is formed thinner than other parts. In this case, when the pressure in the internal space S1 of the container 100 increases, the release valve 250 does not drop off from the casing 201 when the pressure in the internal space S1 of the container 100 rises, but can be opened by breaking the release valve 250.

<4-2>
The first plane D1 and the second plane D2 of the third portion 30 need not be parallel to the direction in which the peripheral seal 130 extends, and can face various directions. However, from the viewpoint of workability at the time of attaching the valve structure 200 to the container 100, it is parallel to the direction (left-right direction) in which the peripheral edge seal portion 130 extends, or is vertical (substantially vertical) The same applies to the following.).

<4-3>
In the above embodiment, the third portion 30 is disposed on the inner side of the container 100 rather than the second portion 20. However, as shown in FIG. 11, the third portion 30 is disposed on the outer side of the container 100 than the second portion 20. Is also good.

<4-4>
The shape of the first portion 10 is not limited to the above. For example, the outer shape of the first portion 10 may be non-circular as shown in FIGS. 12A and 12B when viewed along the direction in which the first ventilation path A1 extends. Further, the outer shape of the first portion 10 may be circular as shown in FIG. 12C or may be elliptical when viewed along the direction in which the first ventilation path A1 extends. In the case of an elliptical shape, it is preferable that its major axis extends in the left-right direction in parallel (including the case where it is substantially parallel). That is, the first portion 10 may have a cylindrical shape or an elliptical cylindrical shape extending along the central axis C1.

<4-5>
The shape of the second portion 20 is not limited to the above, and the outer shape of the second portion 20 may be non-circular when viewed along the direction in which the central axis C1 extends, for example, an elliptical shape. It may be a triangle, a quadrangle, a pentagon or more polygons.

<4-6>
The shape of the third portion 30 is not limited to the above. For example, as long as the third portion 30 has a pair of parallel planes D1 and D2, the shape of the other portions is not particularly limited. For example, the curved surfaces D3 and D4 may also be planar, and the outer shape of the third portion 30 may be rectangular when viewed along the direction in which the central axis C1 extends. Alternatively, the outer shape of the third portion 30 may be a regular hexagonal shape or a regular octagonal shape when viewed along the direction in which the central axis C1 extends.

<4-7>
In the above embodiment, the first portion 10 fixed to the peripheral seal portion 130, the second portion 20 holding the valve mechanism, and the third portion 30 including the pair of planes D1 and D2 extend in the direction in which the passage L1 extends. Was formed as a separate and independent site. However, the present invention is not limited to this mode. For example, as shown in FIG. 13A, the second portion 20 may be omitted, and the valve mechanism may be moved to the first portion 10. Alternatively, as shown in FIG. 13B, a pair of planes D1 and D2 may be formed on the outer surface of the second portion 20 holding the valve mechanism, and the third portion 30 may be omitted.

DESCRIPTION OF SYMBOLS 1 Electric storage device 100 Container 110 Packaging material 120 Packaging material 130 Peripheral seal part 101 Container 200 Valve structure 201 Casing 10 First part 20 Second part 30 Third part 400 Battery element 41 First wing part 42 Second wing part L1 Passage A1 First ventilation path A2 Second ventilation path A3 Third ventilation path D1 First plane D2 Second plane O1 Inlet O2 Exit S1 Internal space

Claims (10)

A valve structure attached to the container,
A casing formed with a passage for discharging gas generated inside the container to the outside of the container,
A valve mechanism that is held by the casing and that passes the gas to the outside of the container via the passage when the internal pressure of the container increases due to the gas generated inside the container. ,
The casing is
A first portion having a first ventilation path included in the passage, and being fixed to the container so that the gas generated inside the container flows into the first ventilation path;
A second portion that is included in the passage, that has a second air passage that is located outside the container with respect to the first air passage, and that holds the valve mechanism;
A third air passage included in the passage and located on the outer side of the container with respect to the first air passage , including a first plane and a second plane parallel to the first plane; Part and
Including
The second portion does not have a pair of planes parallel to each other when viewed along a direction in which the second ventilation path extends,
Valve structure for power storage device. The first portion, when viewed along the direction in which the first ventilation path extends, has a first wing-shaped portion formed thinner from a central portion toward a first direction, and a second wing-shaped portion opposite to the first direction. A second wing-shaped portion formed thinner toward the direction,
A valve structure for an electricity storage device according to claim 1 .   A valve structure attached to the container,
  A casing formed with a passage for discharging gas generated inside the container to the outside of the container,
  A valve mechanism that is held by the casing and that passes the gas to the outside of the container through the passage when the internal pressure of the container increases due to the gas generated inside the container.
With
  The casing is
  A first portion having a first ventilation passage included in the passage, the first portion being fixed to the container so that the gas generated inside the container flows into the first ventilation passage;
Including
  A portion located on the outside of the container with respect to the first portion includes a first plane and a second plane parallel to the first plane,
  The first portion, when viewed along the direction in which the first ventilation path extends, has a first wing-shaped portion formed thinner from a central portion toward a first direction, and a second wing-shaped portion opposite to the first direction. A second wing-shaped portion formed thinner toward the direction,
Valve structure for power storage device. The casing is
A second portion that is included in the passage, that has a second air passage that is located outside the container with respect to the first air passage, and that holds the valve mechanism;
A third air passage included in the passage and located on the outer side of the container relative to the first air passage, further including a third portion including the first plane and the second plane;
A valve structure for an electricity storage device according to claim 3 . The third ventilation path is located closer to the inside of the container than the second ventilation path,
The valve structure for an electricity storage device according to claim 1, 2, or 4 . The first portion is non-circular when viewed along the direction in which the first ventilation path extends,
For an electricity storage device valve structure according to any one of claims 1 to 5. The first plane and the second plane are parallel or perpendicular to the first direction and the second direction,
A valve structure for a power storage device according to claim 2 . A container made of a packaging material, having an internal space and a peripheral seal portion that defines a peripheral edge of the internal space,
A battery element housed in the internal space of the container,
And a valve structure attached to the peripheral seal portion, a power storage device,
The valve structure,
A casing formed with a passage for discharging gas generated inside the container to the outside of the container,
A valve mechanism that is held by the casing and that passes the gas to the outside of the container through the passage when the internal pressure of the container increases due to the gas generated inside the container. ,
The casing is
A first portion having a first ventilation path included in the passage, and fixed to the container so that the gas generated inside the container flows into the first ventilation path;
A second portion that is included in the passage, that has a second ventilation passage that is located on the outer side of the container relative to the first ventilation passage, and that holds the valve mechanism;
A third air passage included in the passage and located on the outer side of the container with respect to the first air passage , including a first plane and a second plane parallel to the first plane; Part and
Including
The second portion does not have a pair of planes parallel to each other when viewed along a direction in which the second ventilation path extends,
Power storage device.   A container made of a packaging material, having an internal space and a peripheral seal portion that defines a peripheral edge of the internal space,
  A battery element housed in the internal space of the container,
  A valve structure attached to the peripheral seal portion;
A power storage device comprising:
  The valve structure,
  A casing formed with a passage for discharging gas generated inside the container to the outside of the container,
  A valve mechanism that is held by the casing and that passes the gas to the outside of the container through the passage when the internal pressure of the container increases due to the gas generated inside the container.
Including
  The casing is
  A first portion having a first ventilation passage included in the passage, the first portion being fixed to the container so that the gas generated inside the container flows into the first ventilation passage;
Including
  A portion located on the outside of the container with respect to the first portion includes a first plane and a second plane parallel to the first plane,
  The first portion, when viewed along the direction in which the first ventilation path extends, has a first wing-shaped portion formed thinner from a central portion toward a first direction, and a second wing-shaped portion opposite to the first direction. A second wing-shaped portion formed thinner toward the direction,
Power storage device. The first plane and the second plane are parallel or perpendicular to a direction in which the peripheral edge seal portion extends,
Storage device according to claim 8 or 9.