Valve, valve component, and battery unit

Abstract

A valve (100) is provided with: a valve component (10) formed from an elastic body and having a lip part (11) in an umbrella form; and a mounting pin (20) for mounting the valve component (10) on a mounting object (for example, a top plate (212) of a battery case (210)) while passing through the center portion of the valve component (10).

Description

Valves, valve parts and battery units

[0001] The present invention relates to a valve, a valve component, and a battery unit.

[0002] 2. Description of the Related Art A valve (check valve) is known for releasing and regulating pressure when the internal pressure of a closed space increases.

[0003] Such valves are described, for example, in Patent Documents 1 and 2. The valves in Patent Documents 1 and 2 (referred to as "umbrella valves" in Patent Document 2) are made of an elastic body integrally having a shaft portion (referred to as "mounting handle" in Patent Document 2) that is inserted into and fixed to an object to which it is attached, and an umbrella-shaped lip portion (referred to as "valve" in Patent Document 1 and "umbrella-shaped portion" in Patent Document 2) that extends radially from the shaft portion.

[0004] JP-A-61-181169 JP-A-59-15864

[0005] According to the investigations of the present inventors, the techniques of Patent Documents 1 and 2 have room for improvement in terms of achieving both a stable attachment state to the attachment object and pressure release at a desired release pressure.

[0006] The present invention has been made in consideration of the above-mentioned problems, and provides a valve, valve components, and battery unit with a structure that can easily achieve a stable attachment state of the valve to the attachment object and pressure release at the desired release pressure.

[0007] According to the present invention, there is provided a valve comprising: a valve component formed from an elastic body and having an umbrella-shaped lip; and a mounting pin that passes through the center of the valve component and mounts the valve component to an object to which it is to be mounted.

[0008] The present invention also provides a valve component formed of an elastic body and having an umbrella-shaped lip portion, the valve component having a fixing hole for fixing the valve component, the fixing hole penetrating the center of the valve component.

[0009] The present invention also provides a battery unit comprising: a valve according to the present invention; a case having an air vent; and a battery having a cell unit disposed within the case, wherein the valve is attached to the case and blocks the air vent.

[0010] According to the present invention, it is possible to achieve both a stable attachment state of the valve to the attachment object and pressure release at a desired release pressure.

[0011] FIG. 4( a), FIG. 4(b), and FIG. 4(c) are views showing valve components constituting the valve according to the embodiment, where FIG. 4(a) is a perspective view, FIG. 4(b) is a cross-sectional view along the central axis, and FIG. 4(c) is a plan view. FIG. 5(a) and FIG. 5(b) are views showing mounting pins constituting the valve according to the embodiment, where FIG. 5(a) is a perspective view and FIG. 5(b) is a plan view. FIG. 5(b) is a view showing an example of behavior of the valve according to the embodiment when pressure is released (cross-sectional view along the central axis). FIG. 5(c) is a schematic cross-sectional view showing a battery unit according to the embodiment.

[0012] An embodiment of the present invention will be described below with reference to the drawings. Note that, in all drawings, similar components are designated by the same reference numerals, and their description will be omitted where appropriate. FIG. 1 is a perspective cross-sectional view taken along line A-A in FIG. 3. FIG. 2 is a cross-sectional view taken along line B-B in FIG. 3. FIG. 4 is a cross-sectional view of the valve component 10 of the valve 100 taken at a position corresponding to line B-B in FIG. 3. FIGS. 4(a), 4(b), and 4(c) show the shape of the valve component 10 in its natural state before the valve 100 is attached to an attachment object. The shape of the valve component 10 in its natural state is also indicated by a two-dot chain line in FIG. 2. FIG. 6 is a cross-sectional view taken along line B-B in FIG. 3, similar to FIG. 2. The shape of the valve component 10 indicated by a solid line in FIG. 6 is an example of the shape of the valve component 10 when pressure is released. The shape of the valve component 10 indicated by a two-dot chain line in FIG. 6 is the shape of the valve component 10 when pressure is released. FIGS. 1 to 3 and 6 show the valve 10 attached to the top plate 212 (attachment object) of the case 210. 7 is a cross-sectional view of the battery unit 300 taken along line B-B in FIG. 3. In the following description, the direction along the central axis AX of the bulb 100 is referred to as the axial direction, the radial direction about the central axis AX is referred to as the radial direction, and the circumferential direction about the central axis AX is referred to as the circumferential direction. For convenience, the upper direction in FIG. 2 along the central axis AX of the bulb 100 may be referred to as the "upper" direction, and the lower direction may be referred to as the "lower" direction. However, these upper and lower directions do not necessarily coincide with the directions when the bulb 100 is attached to an attachment object.

[0013] As shown in Figures 1 to 3, the valve 100 according to this embodiment comprises a valve part 10 formed of an elastic material and having an umbrella-shaped lip portion 11, and a mounting pin 20 that passes through the center of the valve part 10 and mounts the valve part 10 to an object to be mounted (for example, the top plate 212 of the case 210 of the battery 200).

[0014] According to this embodiment, the valve component 10 and the mounting pin 20 are separate, and therefore the characteristics (such as rigidity) of the mounting pin 20 and the valve component 10 can be individually set as desired, making it easy to achieve a stable mounting state of the valve 100 and pressure release at a desired release pressure. The release pressure of the valve 100 is preferably low and within a certain range. According to this embodiment, the desired characteristics of the valve component 10 can be set, making it easy to control the release pressure of the valve 100 with high precision (setting it to the desired release pressure). Furthermore, the desired characteristics of the mounting pin 20 can also be set, making it easy to achieve a stable mounting state of the valve 100. In contrast, in the technologies of Patent Documents 1 and 2, the stem and lip of the valve are integrally molded from the same material, making it difficult to individually set the characteristics of the stem and lip, making it difficult to achieve a stable mounting state of the valve and pressure release at a desired release pressure.

[0015] Furthermore, according to this embodiment, the number of parts that make up the valve 100 is, for example, only two, which prevents excessive production costs and reduces the amount of labor required to attach the valve 100 to the object to which it is to be attached.

[0016] The present embodiment will be described in more detail below.

[0017] The elastic body constituting the valve component 10 is made of a highly elastic material (rubber-like elastic body) such as rubber (synthetic rubber or natural rubber) or thermoplastic elastomer (thermoplastic resin rubber elastic body), and has flexibility. As an example, the valve component 10 is made of EPDM (ethylene propylene diene rubber).

[0018] The mounting pin 20 is preferably made of a material with higher rigidity (higher Young's modulus) than the valve component 10, and the mounting pin 20 is made of, for example, resin or metal. By making the mounting pin 20 from a resin or other material with higher rigidity than the valve component 10, a stable mounting state of the valve 100 can be easily achieved, and the valve 100 can remain stably mounted even in the event of, for example, a sudden increase in pressure in the closed space. Furthermore, because the mounting pin 20 has higher rigidity than the valve component 10 (the valve component 10 has lower rigidity than the mounting pin 20), the valve component 10 is more easily deformed than the mounting pin 20. This allows the opening pressure of the valve 100 to be set at a lower pressure.

[0019] As shown in Figures 1 to 4(b), in this embodiment, the lip portion 11 is curved in a dome shape that is convex in a direction away from the object to which it is attached (convex upward in Figures 2 and 4(b)). The dome shape of the lip portion 11 improves the mechanical strength (deformation resistance) of the lip portion 11, making it easier to set the opening pressure of the valve 100 to a certain level or higher. This is because the shape of the lip portion 11 can be maintained at a substantially constant shape even if sufficient interference is ensured when attaching the valve component 10 to the object to which it is attached.

[0020] The interference is the difference in height (the distance along the central axis AX) between the peripheral edge 11c of the lip portion 11 (the lower edge of the lip portion 11) shown by the solid line in Fig. 2 and the peripheral edge 11c of the lip portion 11 shown by the two-dot chain line in Fig. 2. When the valve component 10 is attached to an object to which it is to be attached and the peripheral edge 11c is pressed against the object, the valve component 10 deforms in the direction in which the peripheral edge 11c is raised (mainly the lip portion 11 is deformed), and assumes the shape shown by the solid line in Fig. 2.

[0021] In this embodiment, the inclination angle α ( FIG. 2 ) of the peripheral edge 11b of the lip portion 11 is 45 degrees or greater, e.g., 60 degrees or greater. This allows the peripheral edge 11b of the lip portion 11 to be pressed against the mounting object at an angle closer to vertical, making it easier to set the release pressure above a certain level. The inclination angle α is an angle with respect to a plane perpendicular to the central axis AX of the valve 100. Here, the inclination angle α is the inclination angle α of the outer surface of the lip portion 11, between the inner surface (the lower surface in FIG. 2 ) and the outer surface (the upper surface in FIG. 2 ). That is, the inclination angle α is the angle between a tangent L ( FIG. 2 ) to the lower end of the peripheral edge 11b of the lip portion 11 and a line perpendicular to the central axis AX in a cross section taken along the central axis AX. Here, even when the valve 100 is mounted to the mounting object as shown in FIG. 2 , the inclination angle α is 45 degrees or greater, e.g., 60 degrees or greater. However, even if the inclination angle α is 45 degrees or more (e.g., 60 degrees or more) when the valve component 10 is in its natural state before the valve 100 is attached to the attachment object, the inclination angle α may be less than 45 degrees when the valve 100 is attached to the attachment object. In this embodiment, the attachment object is the top plate 212 of the case 210, which is a flat plate perpendicular to the central axis AX. Therefore, the inclination angle α coincides with the angle of the peripheral edge portion 11b relative to the surface direction of the top plate 212.

[0022] In this embodiment, the circumferential edge 11c of the lip portion 11 is continuous and continuous around a 360-degree periphery. This allows the circumferential edge 11c of the lip portion 11 to be pressed against the mounting object in a 360-degree periphery without interruption, making it easy to set the opening pressure of the valve 100 above a certain level. Furthermore, when the mounting object is flat, the circumferential edge 11c of the lip portion 11 can be pressed against the mounting object in a 360-degree periphery without interruption by setting (ensuring) an interference around the circumferential edge 11c of the lip portion 11. As shown in FIG. 4(b), in the natural state before mounting the valve component 10 to the mounting object, the circumferential edge 11c is positioned lower than the underside of the fastening portion 13 around the entire 360-degree periphery.

[0023] In this embodiment, the thickness of the lip portion 11 at the peripheral edge 11b of the lip portion 11 is smaller than the thickness of the lip portion 11 at the central portion 11a of the lip portion 11. Here, the peripheral edge 11b of the lip portion 11 includes a portion that is spaced apart from the attachment object (the top plate 212 of the case 210) as shown in FIG. 2 (a portion located above the upper surface of the top plate 212 in FIG. 2). The central portion 11a of the lip portion 11 is connected to the upper end of the annular wall portion 14 described below. The smaller thickness of the peripheral edge 11b of the lip portion 11 facilitates deformation of the peripheral edge 11b, such as rolling up, when pressure is released, allowing the release pressure of the valve 100 to be set lower. For example, the thickness of the peripheral edge 11b decreases toward the peripheral edge 11c. This structure facilitates deformation of the peripheral edge 11b near the peripheral edge 11c.

[0024] In this embodiment, the valve component 10 includes a fixed portion 13 having a fixing hole 12 through which a mounting pin 20 is inserted, and fixed to an object to be mounted by the mounting pin 20 and disposed along the object to be mounted, and an annular wall portion 14 rising from the periphery of the fixed portion 13 in a direction away from the object to be mounted. The lip portion 11 protrudes outward (spreads radially outward) from the end of the annular wall portion 14 in the rising direction (the upper end of the annular wall portion 14 in FIG. 2 ). Therefore, the valve component 10 has a shape including a recess 15 (counterbore) defined by the upper surface of the fixed portion 13 and the inner circumferential surface of the annular wall portion 14. This structure reduces the bending rigidity of the fixed portion 13 compared to a structure in which the dimensions of the fixed portion 13 are equal to those of the lip portion 11 in the direction of the central axis AX, and therefore facilitates deformation of the fixed portion 13 when pressure is released. This makes it easier for the periphery 11c of the lip portion 11 to move away from the mounting object when pressure is released, allowing the release pressure of the valve 100 to be set at a low pressure. Furthermore, because the annular wall portion 14 can also deform when pressure is released, this also makes it easier for the periphery 11c of the lip portion 11 to move away from the mounting object when pressure is released, which also allows the release pressure of the valve 100 to be set at a low pressure. Furthermore, because the head 22 of the mounting pin 20 is surrounded by the annular wall portion 14, the annular wall portion 14 can protect the mounting pin 20. This reduces the impact of the outside of the annular wall portion 14 on the mounting pin 20. Furthermore, because the mounting pin 20 is inserted inside the annular wall portion 14 when the valve 100 is mounted to the mounting object, damage to the lip portion by the mounting pin 20 during insertion can be reduced. In addition, after the annular wall portion 14 rises from the fixing portion 13, the lip portion 11 protrudes outward from the annular wall portion 14, making it easy to realize a structure in which the inclination angle α of the peripheral portion 11b of the lip portion 11 is a steeper angle.

[0025] The fixing portion 13 is formed, for example, in a flat plate shape, and a fixing hole 12 is formed in the center of the fixing portion 13. The fixing hole 12 penetrates the fixing portion 13 from top to bottom. The central axis of the fixing hole 12 coincides with the central axis AX. The fixing hole 12 is, for example, a circular hole. The planar shape of the fixing portion 13 is a donut shape centered on the central axis AX. The radius of the fixing portion 13 is, for example, larger than the thickness dimension of the fixing portion 13 (the dimension in the direction along the central axis AX), and is at least twice the thickness dimension. By doing so, the flexibility of the fixing portion 13 can be sufficiently ensured.

[0026] The annular wall portion 14 is formed, for example, in a cylindrical shape centered on the central axis AX. There are no particular limitations on the relationship between the thickness (radial thickness) of the annular wall portion 14 and the thickness of the fixed portion 13, but in this embodiment, the thickness of the annular wall portion 14 is smaller than the thickness of the fixed portion 13. This structure allows the annular wall portion 14 to deform more easily when pressure is released.

[0027] The relationship between the thickness of the lip portion 11 and the thickness of the fixed portion 13 is not particularly limited, but in this embodiment, the thickness of the lip portion 11 is smaller than the thickness of the fixed portion 13. This results in a structure that allows the lip portion 11 to deform more easily when pressure is released. Furthermore, the relationship between the thickness of the lip portion 11 and the thickness of the annular wall portion 14 is not particularly limited, but in this embodiment, the thickness of the lip portion 11 is equal to or smaller than the thickness of the annular wall portion 14. This results in a structure that allows the lip portion 11 to deform more easily when pressure is released. More specifically, the thickness of the central portion 11a of the lip portion 11 is, for example, equal to or slightly smaller than the thickness of the annular wall portion 14.

[0028] The relationship between the radius of the fixing portion 13 and the dimension of the annular wall portion 14 in the direction of the central axis AX, i.e., the vertical dimension of the annular wall portion 14 (the distance from the lower surface of the fixing portion 13 to the upper end of the annular wall portion 14), is not particularly limited, but in this embodiment, the radius of the fixing portion 13 is larger than the vertical dimension of the annular wall portion 14. This makes it easy to deform the fixing portion 13. In this embodiment, the fixing portion 13 is formed thicker than the annular wall portion 14, but even in this case, the fixing portion 13 can deform when pressure is released.

[0029] As shown in Figures 5(a) and 5(b), the mounting pin 20 has a shaft portion 21 and a head portion 22 formed at one end (upper end) of the shaft portion 21. The head portion 22 has a larger radial dimension (larger diameter) than the one end (upper end) of the shaft portion 21. The lower surface of the head portion 22 is formed, for example, flat and contacts the upper surface of the fixing portion 13 (see Figure 2). The central axis of the shaft portion 21 coincides with the central axis AX. The shaft portion 21 has a linear portion 21a (with a constant diameter) that passes through the fixing hole 12 and the mounting hole 215, and a protruding portion 21b that protrudes from the tip (lower end) of the linear portion 21a in the extension direction of the linear portion 21a. The linear portion 21a is, for example, cylindrical in shape. In this embodiment, the length of the linear portion 21a is set to be equal to or slightly smaller than the sum of the thickness of the fixing portion 13 and the thickness of the top plate 212. At the boundary between the linear portion 21a and the protruding portion 21b, the diameter of the shaft portion 21 changes discontinuously, with the diameter of the protruding portion 21b being larger than the diameter of the linear portion 21a (see FIG. 2). Therefore, a stepped surface exists at the boundary between the linear portion 21a and the protruding portion 21b, and this stepped surface forms a barbed portion 21c that engages with the attachment target. In other words, the mounting pin 20 has a barbed portion 21c that engages with the attachment target. The protruding portion 21b is tapered from the barbed portion 21c toward the tip of the protruding portion 21b. The tip of the protruding portion 21b is, for example, rounded. The diameter of the protruding portion 21b near the tip may be smaller than the diameter of the linear portion 21a.

[0030] The functions required of the valve 100 include, for example, <1> a function to prevent foreign matter (e.g., water, muddy water, dust, etc.) from entering the interior of the equipment to which the valve 100 is attached (external sealing function), <2> a function to release pressure at low pressure (e.g., several kPa), <3> a function to release a large flow rate of gas, and <4> a function to easily install the valve 100 and maintain the valve 100 in a stable installed state even when the internal pressure increases. The valve 100 is configured to release pressure, for example, when the pressure in the closed space becomes several kPa (e.g., 5 kPa) or more higher than the pressure in the external space. That is, the valve opening pressure of the valve 100 is set to, for example, several kPa. The valve 100 is preferably capable of releasing several thousand L / min, e.g., 5,000 to 6,000 L / min, of gas when releasing pressure, but can also be capable of releasing 10,000 L / min or more. The target flow rate can also be set by adjusting the hardness of the material that constitutes the valve component 10. The target valve opening pressure can also be set by changing the interference.

[0031] The valve 100 is configured as described above.

[0032] The valve 100 can be attached to an object (e.g., the top plate 212 of the case 210) in the following manner. First, the valve component 10 is placed on the object (e.g., the top plate 212 of the case 210) so that the valve component 10 blocks the vent hole 214. That is, the valve component 10 is placed on the top surface of the top plate 212. At this time, the fixing hole 12 of the valve component 10 is aligned with the mounting hole 215. Next, the protruding portion 21b of the mounting pin 20 is passed through the recess 15, the fixing hole 12, and the mounting hole 215 in this order, penetrating the top plate 212 to the opposite side (lower side) from the side where the valve component 10 is placed (upper side). This causes the return portion 21c to engage with the underside of the top plate 212, and the mounting pin 20 stably fixes the valve component 10, and thus the entire valve 100, to the top plate 212. The valve 100 can be easily attached by hand (bare hands, for example) by a worker, and no tools are required.

[0033] Next, an example of the operation of the valve 100 will be described with reference to FIG.

[0034] When the pressure in the closed space rises above the valve-opening pressure, gas flowing into the lip portion 11 through the vent hole 214 attempts to push up the lip portion 11 and escape to the external space. At this time, as described below, the pressure is released by a combined action of, for example, deformation of the fixing portion 13, deformation of the annular wall portion 14, and deformation of the lip portion 11 (particularly significant deformation at the peripheral edge portion 11b). Regarding the deformation of the fixing portion 13, as shown by arrow C in FIG. 6 , the fixing portion 13 is bent and deformed in such a way that the portion of the fixing portion 13 farther from the central axis AX rises from the attachment object (top plate 212). Due to this deformation of the fixing portion 13, for example, the annular wall portion 14 is displaced in a direction narrowing the upper end (the direction shown by arrow D in FIG. 6 ), and as a result, the lip portion 11 rises more significantly the farther from the central axis AX (behaving as shown by arrow E in FIG. 6 ). The annular wall portion 14 itself also deforms in a direction narrowing its upper end (indicated by arrow D in FIG. 6 ). This deformation of the annular wall portion 14 also causes the lip portion 11 to rise more significantly at portions farther from the central axis AX. The recess 15 of the valve 100 enables the above-described deformation of the fixing portion 13 and the annular wall portion 14. Furthermore, the peripheral edge portion 11b of the lip portion 11 deforms such that the tip side (the peripheral edge 11c side) is curled outward, as indicated by arrow F in FIG. 6 . As a result, a gap is created between the peripheral edge 11c and the mounting object (top plate 212), allowing gas in the closed space to escape (become open) to the outside, as indicated by arrow G in FIG. 6 . For convenience, FIG. 6 illustrates the deformation of the valve component 10 symmetrically about the central axis AX. However, in reality, only a specific portion (or multiple portions) of the valve component 10 in the circumferential direction may deform.

[0035] Next, a valve component 10 according to this embodiment will be described. The valve component 10 according to this embodiment is the valve component 10 of the valve 100 according to this embodiment. That is, the valve component 10 according to this embodiment is formed of an elastic body and has an umbrella-shaped lip portion 11. The valve component 10 has a fixing hole 12 for fixing the valve component 10, and the fixing hole 12 penetrates the center of the valve component 10.

[0036] 7, the valve 100 according to this embodiment can be used by being attached to a case 210 of a battery 200 of, for example, an electric vehicle, a hybrid vehicle, etc. The case 210 has, for example, a bottom plate 211, a top plate 212 disposed opposite the bottom plate 211 and spaced apart from it, and a side wall 213 connecting the periphery of the bottom plate 211 and the periphery of the top plate 212 to each other.

[0037] The top plate 212 is formed with one or more vent holes 214 and mounting holes 215 for inserting and fixing the mounting pins 20. As an example, as shown in FIG. 3 , multiple (e.g., three) vent holes 214 of the same shape and dimensions are arranged (equally spaced) around the mounting hole 215 at equal angular intervals. Each vent hole 214 is spaced equidistant from the mounting hole 215. The shape of the vent hole 214 is not particularly limited, but may be, for example, an annular sector extending in an arc about the central axis AX. For example, at least the portion of the top plate 212 where the valve 100 is attached (the portion covered by the valve component 10) is formed flat (plate-like). In addition to the case 210, the battery 200 includes a cell unit 220 housed within the case 210. The cell unit 220 is a unit formed of multiple battery cells. Then, by attaching the valve 100 to the battery 200, a battery unit 300 including the battery 200 and the valve 100 is formed. The battery unit 300 has an internal closed space including the internal space of the case 210 and the space inside the lip portion 11.

[0038] As described above, the battery unit 300 according to this embodiment includes the valve 100 according to this embodiment and the battery 200. The battery 200 includes a case 210 having a vent hole 214, and a cell unit 220 disposed within the case 210. The valve 100 is attached to (the top plate 212 of) the case 210, and the valve 100 blocks the vent hole 214. The battery unit 300 according to this embodiment is capable of releasing a large amount of gas as described above when a battery cell constituting the cell unit 220 experiences thermal runaway.

[0039] Although the above embodiments have been described with reference to the drawings, these are merely illustrative examples of the present invention, and various other configurations may be employed. For example, the above describes an example in which the valve 100 is attached to the case 210 of the battery 200. However, the valve 100 may also be attached to a device other than the battery 200. For example, the valve 100 may be attached to the case of a module unit other than the battery 200, such as a PCU (power control unit) for controlling the power of an electric vehicle or the like. Furthermore, the above describes an example in which the lip portion 11 is dome-shaped. However, the lip portion 11 may have a shape other than a dome-shape. For example, the lip portion 11 may be frustum-shaped. Furthermore, the above describes an example in which the valve component 10 has a counterbore, i.e., the valve component 10 has a fixing portion 13, an annular wall portion 14, and a recess 15. However, the fixing portion 13 of the valve component 10 may have a thickness dimension similar to the dimension of the lip portion 11 in the direction of the central axis AX, and the valve component 10 may not have the annular wall portion 14 or the recess 15. In addition, although the above describes an example in which the thickness of the peripheral edge portion 11b of the lip portion 11 is smaller than the thickness of the central portion 11a, the central portion 11a and the peripheral edge portion 11b may have the same thickness. In addition, in the above description, the mounting pin 20 has a barbed portion 21c, but the mounting pin 20 may not have a barbed portion 21c and may be fixed to the mounting object only by friction caused by press-fitting.

[0040] This embodiment encompasses the following technical concepts: (1) A valve comprising a valve component formed of an elastic body and having an umbrella-shaped lip portion; and a mounting pin that passes through a center of the valve component and mounts the valve component to an object to which the valve component is to be mounted. (2) The valve described in (1), wherein the lip portion is curved in a dome shape that is convex in a direction away from the object to which the valve component is to be mounted. (3) The valve described in (1) or (2), wherein the inclination angle of the peripheral edge of the lip portion is 45 degrees or more. (4) The valve described in any one of (1) to (3), wherein the peripheral edge of the lip portion is continuous around 360 degrees without interruption. (5) The valve described in any one of (1) to (4), wherein the thickness of the peripheral edge of the lip portion is smaller than the thickness of the central portion of the lip portion. (6) The valve component according to any one of (1) to (5), wherein the valve component has: a fixing portion having a fixing hole through which the mounting pin is inserted, the fixing portion being fixed to the object to be mounted by the mounting pin and arranged along the object to be mounted; and an annular wall portion standing up from the peripheral edge of the fixing portion in a direction away from the object to be mounted, and the lip portion protruding outward from the end of the annular wall portion in the standing direction. (7) The valve according to any one of (1) to (6), wherein the mounting pin has a barb portion that engages with the object to be mounted. (8) The valve according to any one of (1) to (7), wherein the mounting pin is made of resin. (9) A valve component formed of an elastic body and having an umbrella-shaped lip portion, the valve component having a fixing hole for fixing the valve component, the fixing hole penetrating a center of the valve component. (10) A battery unit comprising: a valve according to any one of (1) to (8); a case having an air vent; and a cell unit disposed in the case, wherein the valve is attached to the case and closes the air vent.

[0041] REFERENCE SIGNS LIST 10 Valve part 11 Lip portion 11a Central portion 11b Peripheral edge portion 11c Peripheral edge 12 Fixing hole 13 Fixing portion 14 Annular wall portion 15 Recessed portion 20 Mounting pin 21 Shaft portion 21a Straight portion 21b Protruding portion 21c Turned portion 21d Tip 22 Head portion 100 Valve 200 Battery 210 Case 211 Bottom plate 212 Top plate (mounting object) 213 Side wall 214 Ventilation hole 215 Mounting hole 220 Cell unit 300 Battery unit

Claims

1. a valve part formed of an elastic body and having an umbrella-shaped lip portion; an attachment pin that passes through a central portion of the valve component and attaches the valve component to an attachment object; A valve comprising:

2. The valve according to claim 1 , wherein the lip portion is curved in a dome shape that is convex in a direction away from the attachment object.

3. 3. The valve according to claim 1, wherein the peripheral edge of the lip portion has an inclination angle of 45 degrees or more.

4. 3. The valve according to claim 1, wherein the peripheral edge of the lip portion is continuous around 360 degrees without interruption.

5. 3. The valve according to claim 1, wherein the thickness of the lip portion at the peripheral edge is smaller than the thickness of the lip portion at the center.

6. The valve component comprises: a fixing portion having a fixing hole through which the mounting pin is inserted, and being fixed to the object by the mounting pin and being disposed along the object; an annular wall portion standing upright from a peripheral edge portion of the fixing portion in a direction away from the attachment object; and 3. The valve according to claim 1, wherein the lip portion projects outward from an end portion of the annular wall portion in a rising direction.

7. 3. The valve according to claim 1, wherein the mounting pin has a barb that engages with the object to be mounted.

8. 3. The valve according to claim 1, wherein the mounting pin is made of resin.

9. A valve component formed of an elastic body and having an umbrella-shaped lip portion, a fixing hole for fixing the valve part; The fixing hole passes through the center of the valve component.

10. A valve according to claim 1 or 2; a battery having a case with a vent hole and a cell unit disposed in the case; Equipped with The battery unit has the valve attached to the case, and the valve closes the air vent.