Gas detection tool and battery unit

Abstract

To detect occurrence of a gas in a housing before disassembly of the housing without using an electric technique.SOLUTION: A gas detection tool 100 integrally includes: an outer arrangement part 10 disposed outside a housing defining a closed space; an inner arrangement part 20 which is disposed ranging from the inside of a through hole penetrating through the inside and outside of the housing to the inside of the closed space. The inner arrangement part 20 has: a detection part 21 which gives a color when contacting with a gas to be detected; and a seal part 22 which seals a portion inserted into the through hole in the inner arrangement part 20 and the through hole in an air-tight manner in a state that at least a part of the detection part 21 is disposed in the closed space. The gas detection tool 100 is configured to be drawable until the detection part 21 is exposed to the outside of the housing through the through hole.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a gas detector and a battery unit. [Background technology]

[0002] Secondary batteries used in electric vehicles and the like are capable of discharging by converting chemical energy from chemical reactions into electrical energy, and charging by the reverse reaction. In particular, lithium secondary batteries have a high energy density and are used in a wide range of fields. Such secondary batteries have a configuration in which a cell unit is sealed within a housing that defines an enclosed space. Some secondary batteries generate hydrogen sulfide due to sulfide-based electrolyte materials, etc. Since the generation of hydrogen sulfide leads to deterioration of the battery, technologies for electrically detecting hydrogen sulfide have been proposed (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 074097 Brochure [Patent Document 2] JP 2018-73801 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the techniques of Patent Documents 1 and 2 require electrical detection of hydrogen sulfide, which results in a complex device configuration. In addition, since secondary batteries use rare metals, it is preferable to reuse the battery itself or part of it. Therefore, it is expected that the battery will be disassembled and repaired by dealers or other people, but from a safety standpoint, it is desirable to check for hydrogen sulfide generation before disassembling the battery case.

[0005] The present invention has been made in consideration of the above-mentioned problems, and provides a gas detector and a battery unit that can detect the generation of gas (hydrogen sulfide, etc.) within a housing without using electrical methods and before the housing is disassembled. [Means for solving the problem]

[0006] According to the present invention, there is provided an outer arrangement part that is arranged outside a housing that defines a closed space; An inner arrangement portion that is arranged from an inside of a through hole that penetrates the inside and outside of the housing to an inside of the closed space; A gas detection device integrally comprising: The inner arrangement portion is A detection unit that changes color when it comes into contact with a gas to be detected; a seal portion that air-tightly seals a portion of the inner portion that is inserted into the through hole and the through hole when at least a portion of the detection portion is disposed inside the closed space; having The gas detector is configured so that the detection portion can be pulled out until it is exposed to the outside of the housing through the through hole.

[0007] According to the present invention, there is provided a gas detector according to the present invention, The housing; A cell unit disposed in the housing; Equipped with A battery unit is provided in which the gas detection device is attached to the housing, the outer arrangement portion is arranged outside the housing, and the inner arrangement portion is arranged from the inside of the through hole to the inside of the closed space. Effect of the Invention

[0008] According to the present invention, it is possible to detect the generation of gas inside a housing without using electrical methods and before the housing is disassembled. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing the external appearance of a gas detecting device according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] 3(a) and 3(b) are diagrams showing the battery unit according to the first embodiment, with FIG. 3(a) being a perspective view and FIG. 3(b) being a plan view. [Figure 4] FIG. 3(b) is a cross-sectional view taken along line AA in FIG. [Diagram 5] 1 is a cross-sectional view showing a state in which the gas detector has been pulled out from the housing. FIG. [Figure 6] FIG. 11 is a diagram showing the external appearance of a gas detecting device according to a second embodiment. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

[0011] [First embodiment] First, the first embodiment will be described with reference to FIGS. The shape of the gas detector 100 is not particularly limited, but in this embodiment, the gas detector 100 is formed in a rod shape that is long in one direction (the left-right direction in Figs. 1 and 2). FIG. 1 is an external view of a gas detector 100 according to this embodiment, viewed in a direction perpendicular to its longitudinal direction, and FIG. 2 is a cross-sectional view of the gas detector 100 taken along its central axis (the position of line AA shown in FIG. 1). Each of Figures 3(a) to 5 is a diagram showing a battery unit 300 formed by attaching the gas detector 100 to a housing 210 of a battery 200. Of these, Figures 3(a) and 3(b) omit illustration of the cell unit 220 inside the housing 210. Fig. 4 is a cross-sectional view taken along line AA in Fig. 3(b), but shows the external appearance (shape viewed from the side) of gas detector 100. Fig. 5 is also a cross-sectional view taken along line AA in Fig. 3(b), but Fig. 5 is a partially enlarged view and shows the state in which gas detector 100 has been pulled out to its limit position. Fig. 5 also shows the external appearance (shape viewed from the side) of gas detector 100.

[0012] The gas detector 100 according to this embodiment will be described below mainly with reference to Figs. As shown in Figures 1 and 2, the gas detection device 100 of this embodiment is a gas detection device 100 that integrally comprises an outer arrangement section 10 that is arranged outside a housing 210 (Figure 4, etc.) that defines a closed space 210a (Figure 4, etc.), and an inner arrangement section 20 that is arranged from the inside of a through hole 217 that penetrates from the inside to the outside of the housing 210 to the inside of the closed space 210a. The inner-positioned portion 20 has a detection portion 21 that changes color when it comes into contact with the gas to be detected, and a sealing portion 22 that air-tightly seals the portion of the inner-positioned portion 20 that is inserted into the through hole 217 and the through hole 217 when at least a portion of the detection portion 21 is disposed inside the closed space 210a. Here, the portion of the inner arrangement portion 20 that is inserted into the through hole 217 refers to the portion of the inner arrangement portion 20 that is located inside the through hole 217. Gas detector 100 is configured so that it can be pulled out until detection section 21 is exposed to the outside of housing 210 through through-hole 217.

[0013] According to the present embodiment, gas detector 100 has detection section 21 that changes color when it comes into contact with a gas to be detected, and seal section 22 that air-tightly seals inner arrangement section 20 and through-hole 217 from each other, and gas detector 100 can be pulled out of housing 210 until detection section 21 is exposed to the outside of housing 210 through through-hole 217. Therefore, by pulling gas detector 100 out of housing 210 and checking the color of detection section 21, it is possible to detect the presence or absence of gas generation in housing 210. In other words, it is possible to detect gas generation in housing 210 without relying on an electrical method and before housing 210 is dismantled. Therefore, no power source is required for gas detection.

[0014] In this specification, "pulling out the gas detector 100 from the housing 210" means pulling out the gas detector 100 from the housing 210 until the detection section 21 is exposed to the outside of the housing 210 through the through-hole 217, and is not limited to completely removing the external arrangement section 10 from the housing 210. Typically, as will be described later in this embodiment, the gas detector 100 is configured so that it cannot be completely removed from the housing 210.

[0015] This will be explained in more detail below.

[0016] The detection unit 21 may be of any type as long as it changes color when it comes into contact with the gas to be detected, but it is preferable that the detection unit 21 is made of a material containing a metallic material. In the present invention, the type of gas to be detected is not particularly limited, but in this embodiment, the case where the gas to be detected is hydrogen sulfide will be described. In this case, the metal material used for the detection unit 21 may be of any type as long as it changes color when reacting with hydrogen sulfide, but in this embodiment, silver is used because it changes color to black when reacting with hydrogen sulfide, making it easy to visually distinguish.

[0017] The detection portion 21 is formed on at least the surface layer of the inner portion 20 . In the case of the present embodiment, the detection portion 21 is formed only on the surface layer of the inner arrangement portion 20. This makes it possible to reduce the amount of metal material used in the detection portion 21. More specifically, the detection portion 21 is formed on the surface layer of the rod-shaped inner placement portion 20 in a circumferential shape (for example, 360 degrees circumferential shape) around the longitudinal axis of the inner placement portion 20.

[0018] As shown in FIGS. 1 and 2, in this embodiment, a gas detector 100 is provided with a main body 30 made of an elastic body, and the main body 30 has a seal portion 22 and a detection portion 21. Therefore, the sealing property (sealing ability) of the seal portion 22 can be easily achieved, and the seal portion 22 and the detection portion 21 can be integrated into one structure.

[0019] The elastic body constituting the main body 30 is made of a material (rubber-like elastic body) with high elasticity such as rubber (synthetic rubber or natural rubber) or thermoplastic elastomer (thermoplastic resin rubber elastic body), and has flexibility. Examples of materials for the main body 30 include rubber materials such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), fluororubber (FKM), and ethylene propylene diene rubber (EPDM).

[0020] In this embodiment, the gas to be detected is hydrogen sulfide. In this case, the material of the main body 30 is preferably EPDM, which has good sealing properties against hydrogen sulfide and water-based materials. The detection unit 21 is preferably configured to contain a silver filler. For example, rubber (EPDM) containing a silver filler is initially (before contact with hydrogen sulfide) yellowish-white in color, but turns black upon reaction with hydrogen sulfide.

[0021] The main body 30 is formed, for example, by two-color molding of the detection unit 21 and the portion of the main body 30 other than the detection unit 21. In this case, the portion of the main body 30 other than the detection unit 21 is formed, for example, from an elastic body. On the other hand, the detection unit 21 is formed, for example, from an elastic body containing a coloring agent that changes color when it comes into contact with the gas to be detected. However, the present invention is not limited to this example, and the main body 30 may be constructed by molding the parts (elastic body) other than the detection section 21 in the main body 30, and then coating and forming the detection section 21 (elastic body containing a coloring agent that changes color when it comes into contact with the gas to be detected). Furthermore, the detection unit 21 may be adhesively fixed to a portion of the main body 30 other than the detection unit 21.

[0022] In this embodiment, the gas detector 100 includes a core member 40 made of a material having higher rigidity than the main body 30. The core member 40 is disposed (inserted) from the inside of the outer portion 10 to the inside of the inner portion 20. This makes it possible to reinforce the main body 30 with the core member 40. In particular, since the core member 40 is arranged from the inside of the outer arrangement portion 10 to the inside of the inner arrangement portion 20, when the outer arrangement portion 10 is gripped to pull the gas detector 100 out of the housing 210, deformation of the outer arrangement portion 10, the inner arrangement portion 20, and the boundary portion therebetween can be suppressed, making it easy to pull out the gas detector 100. The Young's modulus of the material that constitutes the core member 40 is higher than the Young's modulus of the material that constitutes the main body portion 30 . The core member 40 is preferably made of a metal, and in this embodiment, the core member 40 is made of a metal.

[0023] In this embodiment, even when the detection unit 21 is exposed to the outside of the housing 210 (for example, the state shown in Figure 5), the sealing portion 22 airtightly seals the portion of the inner-positioning portion 20 that is inserted into the through hole 217 and the through hole 217 from each other. This makes it possible to check whether or not the gas to be detected is being generated in housing 210 while maintaining the inside of housing 210 in a sealed state (sealed state).

[0024] In this embodiment, the inner disposed portion 20 is formed in a rod shape that is long in one direction, the seal portion 22 and the detection portion are disposed at different positions in the longitudinal direction of the inner disposed portion 20, and the seal portion 22 is formed to have a larger diameter than the detection portion 21. In other words, the seal portion 22 is formed to be convex radially outwardly more than the detection portion 21. This makes it possible to reduce friction between detection section 21 and the inner circumferential surface of through-hole 217 when, for example, gas detection device 100 is pulled out of housing 210, and therefore damage to detection section 21 can be suppressed.

[0025] In this embodiment, the outer placement portion 10 has a gripping portion 11 that is gripped by the user, and the gas detection device 100 is configured so that when the gripping portion 11 is pulled in a direction away from the housing 210, the detection portion 21 is exposed to the outside of the housing 210 through the through hole 217. Since the outer placement portion 10 has the grip portion 11, the gas detection device 100 can be easily pulled out manually.

[0026] In this embodiment, the outer positioning portion 10 is formed in a rod shape that is long in one direction, and the outer positioning portion 10 and the inner positioning portion 20 are arranged on the same straight line (the outer positioning portion 10 and the inner positioning portion 20 are arranged on an extension of each other).

[0027] An end portion of the outer arrangement portion 10 on the inner arrangement portion 20 side (the right end portion of the outer arrangement portion 10 in FIGS. 1 and 2) has an outer flange portion 12 formed to a dimension that does not allow it to pass through the through hole 217 and capable of abutting against the outer surface of the housing 210. In other words, the outer diameter of the outer flange portion 12 is larger than the inner diameter of the through hole 217. This can prevent the outer arrangement portion 10 from being pushed into the housing 210 by mistake. The end face of the outer flange 12 on the side of the inner arrangement portion 20 is an annular flat surface perpendicular to the longitudinal direction of the gas detector 100. This allows the outer flange 12 to be in stable contact with the outer surface of the housing 210 when the inner arrangement portion 20 is inserted to the deepest point into the housing 210 (see FIG. 4). The outer flange 12 is formed, for example, in a flange shape perpendicular to the longitudinal direction of the outer placement part 10, and protrudes outward (in all directions 360 degrees) from the end part of the outer placement part 10 on the inner placement part 20 side. The outer flange 12 is, for example, in a disk shape.

[0028] In the outer positioning portion 10, the portion adjacent to the outer flange portion 12 on the opposite side to the inner positioning portion 20 (hereinafter referred to as the gripping portion main body 11a) is formed in a rod shape with a smaller diameter than the outer flange portion 12, making it easier for the user to grip. In the outer placement part 10, the end part (hereinafter, the grip part end part 11b) on the side farther from the inner placement part 20 is formed to have a larger diameter than the grip part main body 11a. This improves the gripping property (grip property) of the grip part 11. The above-mentioned grip portion 11 is composed of a grip portion main body 11a and a grip portion end portion 11b.

[0029] A portion of the inner arrangement portion 20 located farther from the outer arrangement portion 10 than the detection portion 21 (a portion of the inner arrangement portion 20 located to the right of a third detection portion 21c described later in Figs. 1 and 2) has an inner flange portion 23 formed to a dimension that does not allow it to pass through the through hole 217 and capable of abutting against the inner surface of the housing 210. In other words, the outer diameter of the inner flange portion 23 is larger than the inner diameter of the through hole 217. This can prevent the entire inner arrangement section 20 from being accidentally pulled out to the outside of the housing 210. In the present embodiment, the inner flange portion 23 is disposed at the end portion of the inner portion 20 (the end portion farther from the outer portion 10). The inner flange 23 is formed, for example, in a flange shape perpendicular to the longitudinal direction of the inner placement part 20, and protrudes outward (in all directions 360 degrees) from the end part of the inner placement part 20. The inner flange 23 is, for example, in a disk shape.

[0030] Here, in the present invention, the cross-sectional shape of the inner cavity of through-hole 217 is not particularly limited, but in this embodiment, the cross-sectional shape of the inner cavity of through-hole 217 is circular. That is, the inner cavity of through-hole 217 has a cylindrical shape. However, when the cross-sectional shape of the inner cavity of the through hole 217 is other than circular, the inner diameter of the through hole 217 is the maximum value of the dimension of the inner cavity of the through hole 217 perpendicular to the axial direction of the through hole 217 (the direction passing through the through hole 217 from the outside to the inside of the housing 210, or from the inside to the outside). In this case, the outer diameter of the outer flange portion 12 is the maximum value of the dimension of the outer flange portion 12 along a direction perpendicular to the longitudinal direction of the outer arrangement portion 10. Moreover, the outer diameter of the inner flange portion 23 is the maximum value of the dimension of the inner flange portion 23 along a direction perpendicular to the longitudinal direction of the inner arrangement portion 20.

[0031] In the inner disposed portion 20, a portion between the outer flange portion 12 and the inner flange portion 23 is an inner main body portion 20a formed in a rod shape that is long in one direction. The inner main body portion 20a has a smaller diameter than the inner flange portion 23 and also has a smaller diameter than the outer flange portion 12. The inner body portion 20 a has a detection portion 21 and a sealing portion 22 . The inner main body portion 20a is formed to a size that allows it to pass through the through hole 217. However, the seal portion 22 is in airtight contact with the inner peripheral surface of the through hole 217 in a circumferential manner to provide a seal.

[0032] In this embodiment, the multiple seal portions 22 and the multiple detection portions 21 are arranged alternately in the longitudinal direction of the inner main body portion 20a. More specifically, for example, the inner main body portion 20a has four seal portions 22 and a total of three detection portions 21 each located between adjacent seal portions 22.

[0033] The cross-sectional shape of the inner main body portion 20a (cross-sectional shape perpendicular to the longitudinal direction of the inner main body portion 20a) is not particularly limited, but at least the cross-sectional shape of the seal portion 22 is formed to correspond to the inner cavity cross-sectional shape of the through hole 217. In this embodiment, the cross-sectional shape of the inner cavity of the through hole 217 is circular, and the cross-sectional shape of the seal portion 22 is also circular. The detection portion 21 has a smaller diameter than the seal portion 22, but also has a circular cross-sectional shape. The outer diameter of the seal portion 22 in its natural state is equal to the inner diameter of the through hole 217, or slightly larger than the inner diameter of the through hole 217. This allows the outer peripheral surface of the seal portion 22 to be in close contact (pressed) with the inner peripheral surface of the through hole 217 in a 360-degree circumferential manner, and good sealing properties are obtained by the seal portion 22. On the other hand, it is preferable that the outer diameter of detection unit 21 is smaller than the inner diameter of through hole 217. It is particularly preferable that the outer peripheral surface of detection unit 21 is kept out of contact with the inner peripheral surface of through hole 217 even when detection unit 21 passes through through hole 217.

[0034] The seal portion 22 is formed, for example, in a shape in which the outer diameter is greatest at the center of the seal portion 22 in the longitudinal direction of the inner main body portion 20a. More specifically, the outline of the seal portion 22 in a cross section taken along the center line of the inner main body portion 20a forms a convex arc in a direction away from the central axis of the inner main body portion 20a (radially outward). The outer diameter of the detection portion 21 is, for example, equal to the smallest diameter portion of the seal portion 22, that is, the outer diameter of both ends of the seal portion 22 in the longitudinal direction of the inner main body portion 20a. The center line of the detection portion 21 coincides with the center line of the seal portion 22 (they are arranged coaxially with each other). Furthermore, for example, the center line of the inner main body portion 20a coincides with the center line of the inner flange portion 23, the center line of the inner placement portion 20, the center line of the outer flange portion 12, the center line of the grip portion main body 11a, the center line of the grip portion end portion 11b, the center line of the outer placement portion 10, and ultimately the center line of the entire gas detection device 100 (for example, they are all arranged coaxially).

[0035] As described above, the gas detector 100 comprises the main body 30 made of an elastic body, and the core member 40 having higher rigidity than the main body 30 (made of, for example, metal). In this embodiment, the gas detector 100 has a simple structure composed of three members: a main body 30, a core member 40, and a fastening member 50 that fastens the main body 30 to the core member 40.

[0036] The core member 40 has, for example, a rod-shaped portion 41 that is long in one direction, and a flange portion 42 that is formed at one end of the rod-shaped portion 41 and has a flange shape with a larger diameter than the rod-shaped portion 41. The rod-shaped portion 41 is inserted through the main body portion 30 from the inside of the outer portion 10 to the inside of the inner portion 20 . The flange portion 42 is disposed outside the main body portion 30 and constitutes the inner flange portion 23 . The rod-shaped portion 41 has a fixing hole 43 for fastening the main body portion 30 with the fastening member 50. The axial direction of the fixing hole 43 extends in a direction perpendicular to the longitudinal direction of the rod-shaped portion 41.

[0037] The main body 30 has a tubular portion 31 with one end open, a flange portion 32 formed in the middle of the longitudinal direction of the tubular portion 31, and a large diameter portion 33 formed on the other end side of the tubular portion 31. The flange portion 32 and the large diameter portion 33 are formed to have a larger diameter than the portion of the cylindrical portion 31 other than the portion where the flange portion 32 is formed.

[0038] The main body 30 has an insertion hole 30a extending from one end of the tubular portion 31 to the inside of the large diameter portion 33. A part (most part) of the insertion hole 30a is the inner cavity of the tubular portion 31, and the remaining part of the insertion hole 30a is an extension of the inner cavity of the tubular portion 31 toward the inside of the large diameter portion 33 with the same diameter. The rod-shaped portion 41 of the core member 40 is inserted into the insertion hole 30a. That is, the rod-shaped portion 41 is inserted from an end portion on the opening side of the insertion hole 30a (one end portion of the insertion hole 30a) to an end portion of the insertion hole 30a located inside the large diameter portion 33 (the other end portion of the insertion hole 30a). The flange portion 42 abuts against the end face of the tubular portion 31 (the peripheral edge portion of the opening of the insertion hole 30a).

[0039] In the cylindrical portion 31, an insertion hole 34 for passing the fastening member 50 from the outside (the radially outward side of the cylindrical portion 31) through the rod-shaped portion 41 is formed in a portion located between the flange portion 32 and the large diameter portion 33. The axial direction of the insertion hole 34 extends in a direction perpendicular to the longitudinal direction of the cylindrical portion 31. The fastening member 50 is passed (eg, screwed) through the fixing hole 43 from the outside of the tubular portion 31 via the insertion hole 34, and the main body portion 30 is fastened to the core member 40 by the fastening member 50. The fastening member 50 is, for example, a male screw having a shaft and a head having a diameter larger than that of the shaft, and the shaft is screwed into the fixing hole 43 of the rod-shaped portion 41. Since the outer diameter of the head of the fastening member 50 is larger than the inner diameter of the insertion hole 34, the main body portion 30 is stably fixed to the core member 40. The outer surface of the head of the fastening member 50 (the end surface opposite the shaft portion) is positioned almost flush with the outer peripheral surface of the portion between the flange portion 32 and the large diameter portion 33 of the tubular portion 31, providing a soft feel against the hand holding the gripping portion 11.

[0040] The flange 32 constitutes the outer portion of the outer flange 12 (excluding the rod-shaped portion 41), and the large diameter portion 33 constitutes the outer portion of the grip end 11b (excluding the rod-shaped portion 41). In the tubular portion 31, the portion between the open end (one end of the insertion hole 30a) and the flange portion 32 constitutes the outer portion (portion excluding the rod-shaped portion 41) of the inner main body portion 20a. In the tubular portion 31, the portion between the outer flange portion 12 and the large diameter portion 33 constitutes the outer portion of the gripping portion main body 11a (excluding the rod-shaped portion 41 and the portion of the fastening member 50 that is inserted inside the rod-shaped portion 41), together with the portion of the fastening member 50 that is located outside the rod-shaped portion 41.

[0041] In the present embodiment, the multiple detection sections 21 included in the inner arrangement section 20 of the gas detection device 100 are identical to one another. That is, the gases to be detected by the detection sections 21 are the same, and the gas detection sensitivities of the detection sections 21 are also equivalent to one another.

[0042] However, the present invention is not limited to this example, and the inner portion 20 may have a plurality of detection portions 21 having different detection sensitivities. Furthermore, the present invention is not limited to this example, and the inner portion 20 may have a plurality of detection portions 21 each detecting a different type of gas as a detection target. In this embodiment, the inner arrangement portion 20 has, for example, three detection portions 21, i.e., a first detection portion 21a, a second detection portion 21b, and a third detection portion 21c, and these detection portions 21 may include detection portions 21 having different detection sensitivities, or may include detection portions 21 that detect different types of gas. As an example, the detection sensitivities of all the detection portions 21 of the multiple detection portions 21 may be different from each other, or the types of gases that the detection portions 21 of the multiple detection portions 21 detect may be different. Of the first detection portion 21a, the second detection portion 21b, and the third detection portion 21c, the first detection portion 21a is located closest to the outer flange portion 12, and the third detection portion 21c is located closest to the inner flange portion 23. One example of a method for making the detection sensitivities of the multiple detection units 21 different from one another is to make the content ratio of metal filler (silver filler, etc.) different in each detection unit 21. In this case, for example, a detection unit 21 with a higher content ratio of metal filler has a higher gas detection sensitivity, and a detection unit 21 with a lower content ratio of metal filler has a lower gas detection sensitivity. Moreover, an example of a method for causing the multiple detection units 21 to detect different types of gases is to cause each detection unit 21 to contain a different type of metal filler. For example, when the gas detected by the first detection unit 21a is hydrogen sulfide and the gas detected by the second detection unit 21b is water vapor, the first detection unit 21a may contain silver filler and the second detection unit 21b may contain cobalt chloride.

[0043] The detection unit 21 preferably contains a polymer material, a coloring agent that changes color when it comes into contact with hydrogen sulfide, and a color reaction accelerator. When the gas detection device 100 has a main body 30 which is an elastic body, and the main body 30 has a detection section 21 and a sealing section 22, the polymeric material referred to here is a material which constitutes the elastic body (such as rubber or a thermoplastic elastomer, which is highly elastic in a cross-linked state). In addition, in cases where the gas detection device 100 does not have a main body 30 which is an elastic body having the detection section 21 and the sealing section 22, the polymer material referred to here may be a hard material which has poor elasticity in a cross-linked state. When the gas to be detected is hydrogen sulfide, the color developer is preferably at least one selected from the group consisting of silver, silver compounds, copper, copper compounds, nickel, nickel compounds, cobalt, cobalt compounds, lead, lead compounds, iron, and iron compounds. The color reaction accelerator is preferably a polar oil. The color reaction accelerator is preferably silicone oil and / or ester oil. It is preferable that the color developer is contained in an amount of 10 parts by weight or more and 500 parts by weight or less, and the color reaction accelerator is contained in an amount of 0.1 parts by weight or more and 30 parts by weight or less, relative to 100 parts by weight of the polymer material. In this way, a gas with a low concentration of hydrogen sulfide can be detected by the color change of the detection part 21 without increasing the content of the color developer.

[0044] <Color reaction accelerator> The color reaction accelerator will now be described in more detail. The present inventors presume that at least a portion of the hydrogen sulfide that comes into contact with the detection unit 21 dissolves in the color reaction accelerator contained in the detection unit 21, and the dissolved hydrogen sulfide (H2S) ionizes and then reacts with the color developer. In this case, the present inventors believe that since most of the hydrogen sulfide quickly dissolves in the color reaction accelerator, the detection unit 21 is likely to develop color or develops color more quickly even if it contains a small amount of color developer.

[0045] The color reaction promoter is not particularly limited, but is preferably an oil having polarity, i.e., a polar oil, because the color developer is easily dissolved in the polar oil.

[0046] The color reaction accelerator may be silicone oil or ester oil, and among these, the color reaction accelerator is preferably silicone oil and / or ester oil. The present inventors have found that the detection unit 21 using silicone oil and / or ester oil as the color reaction accelerator develops color more easily or more quickly even with a small amount of coloring agent.

[0047] The content of the color reaction accelerator in the detection unit 21 is preferably 0.1 parts by weight or more and 30 parts by weight or less with respect to 100 parts by weight of the polymer material. If the amount of the color reaction accelerator relative to the polymeric material is too large, kneading becomes difficult during the manufacturing process, whereas if the amount of the color reaction accelerator relative to the polymeric material is too small, the color developer becomes difficult to color.

[0048] <Color developer> The color developer contained in the detection unit 21 will be described in more detail. The color developer may be any element or compound that changes color when in contact with hydrogen sulfide.

[0049] The color developer may be a chalcophilic or siderophilic element or a compound thereof. Examples of the copper-containing elements include copper, zinc, gallium, germanium, arsenic, selenium, silver, cadmium, lanthanum, tin, antimony, tellurium, mercury, thallium, lead, bismuth, and polonium. Examples of siderophilic elements include manganese, iron, cobalt, nickel, molybdenum, ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum, and gold.

[0050] Among these, the color developer is preferably at least one selected from the group consisting of silver, silver compounds, copper, copper compounds, nickel, nickel compounds, cobalt, cobalt compounds, lead, lead compounds, iron, and iron compounds, and more preferably at least one selected from the group consisting of lead, lead compounds, iron, and iron compounds. The present inventors have found that the detection unit 21 using such a coloring agent develops color more easily or more quickly even if the amount of the coloring agent is small.

[0051] The color developer is preferably in powder form.

[0052] The content of the coloring material in the detection unit 21 is preferably 10 parts by weight or more and 500 parts by weight or less with respect to 100 parts by weight of the polymer material. If the amount of the color reaction accelerator relative to the polymeric material is too large, kneading becomes difficult during the manufacturing process, whereas if the amount of the color reaction accelerator relative to the polymeric material is too small, the color developer becomes difficult to color.

[0053] <Polymer materials> The polymer material contained in the detection unit 21 will be described in more detail. The polymer material is not particularly limited, and examples thereof include conventionally known polymer materials such as diene rubbers and hydrogenated products thereof, olefin rubbers, halogen-containing rubbers, silicone rubbers, sulfur-containing rubbers, and fluororubbers. Examples of diene rubbers and their hydrogenated products include natural rubber (NR), isoprene rubber (IR), epoxidized natural rubber, styrene butadiene rubber (SBR), butadiene rubber (BR) (high cis BR and low cis BR), acrylonitrile butadiene rubber (NBR), hydrogenated NBR, and hydrogenated SBR. Examples of olefin-based rubbers include ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM), maleic acid modified ethylene propylene rubber (M-EPM), maleic anhydride modified ethylene-α-olefin copolymer, ethylene-glycidyl methacrylate copolymer, maleic anhydride modified ethylene-ethyl acrylate copolymer (modified EEA), butyl rubber (IIR), copolymer of isobutylene and aromatic vinyl or diene monomer, acrylic rubber (ACM), ionomer, etc. Examples of halogen-containing rubbers include halogenated butyl rubbers such as brominated butyl rubber (Br-IIR) and chlorinated butyl rubber (Cl-IIR), halogenated isomonoolefin-p-alkylstyrene copolymers (e.g., brominated isobutylene-p-methylstyrene copolymer (BIMS)), halogenated isobutylene-isoprene copolymer rubber, chloroprene rubber (CR), hydrin rubber (CHR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), and maleic acid-modified chlorinated polyethylene (M-CM). Examples of silicone rubbers include methylvinylsilicone rubber, dimethylsilicone rubber, and methylphenylvinylsilicone rubber. Examples of sulfur-containing rubbers include polysulfide rubber. Examples of fluorine-containing rubbers include vinylidene fluoride-based rubbers, fluorine-containing vinyl ether-based rubbers, tetrafluoroethylene-propylene-based rubbers, fluorine-containing silicone rubbers, and fluorine-containing phosphazene-based rubbers.

[0054] The polymer material is preferably at least one selected from the group consisting of ethylene propylene diene rubber (EPDM), silicone rubber, acrylic rubber, and fluororubber.

[0055] The detection unit 21 includes the above-mentioned polymer material, coloring agent, and color reaction promoter, but may also include other components. However, the content of other components is preferably 30% by mass or less, more preferably 15% by mass or less, even more preferably 5% by mass or less, and even more preferably 1% by mass or less.

[0056] When the gas to be detected is, for example, water vapor other than hydrogen sulfide, the detection unit 21 contains, for example, cobalt chloride. In this case, the detection unit 21 is initially blue (before contact with water vapor) and changes color to red by reacting with water vapor.

[0057] Next, the battery unit 300 according to this embodiment will be described mainly with reference to FIG. 3(a) to FIG. The battery unit 300 according to this embodiment includes the gas detector 100 according to this embodiment, a housing 210, and a cell unit 220 disposed within the housing 210. The gas detection device 100 is attached to the housing 210, with the outer portion 10 being arranged outside the housing 210 and the inner portion 20 being arranged from the inside of the through-hole 217 to the inside of the closed space 210a.

[0058] In the battery unit 300, the portion excluding the gas detector 100 is, for example, a battery 200 for an electric vehicle, a hybrid vehicle, or the like. The battery 200 includes a housing 210 and a cell unit 220. The cell unit 220 is a unit formed of a plurality of battery cells. The battery cells are, for example, lithium secondary batteries. The shape of the housing 210 is not particularly limited, but for example, the housing 210 is formed in a rectangular parallelepiped shape with a rectangular planar shape. In this case, the housing 210 has a bottom plate 211, a top plate 212 disposed facing the bottom plate 211 at a distance from the bottom plate 211, and side walls connecting the periphery of the bottom plate 211 and the periphery of the top plate 212. The side walls have, for example, a first side wall 213 and a second side wall 214 disposed facing each other in parallel, and a third side wall 215 and a fourth side wall 216 perpendicular to the first side wall 213 and the second side wall 214, respectively, and disposed facing each other in parallel.

[0059] The housing 210 has a through hole 217 in which the gas detection device 100 is attached. The location where the through hole 217 is formed in the housing 210 is not particularly limited, but in this embodiment, for example, the through hole 217 is formed in the first side wall 213, which is a side wall along the short side of the housing 210 (perpendicular to the long side). The through-hole 217 penetrates the first side wall 213 to allow the inside and outside of the housing 210 to communicate with each other. However, since gas detection tool 100 is disposed so as to pass through through-hole 217, through-hole 217 is sealed, and the inside of housing 210 forms closed space 210a. In the present embodiment, gas detector 100 is attached to housing 210 in a position in which its longitudinal direction is horizontal. However, in the present invention, the arrangement of gas detector 100 is not limited to this example, and gas detector 100 may be arranged so that its longitudinal direction is vertical, or may be arranged in another way.

[0060] The gas detection tool 100 can be attached to the housing 210, for example, in the following manner. First, the gas detector 100 is prepared in a state in which the main body 30 is not fixed to the core member 40, i.e., in a state in which the main body 30, the core member 40 and the fastening member 50 are separate. In addition, the first side wall 213 (the portion of the housing 210 having the through-hole 217) before being assembled into the housing 210 is prepared. Next, the tubular portion 31 of the main body 30 is inserted into the through hole 217 from the surface of the first side wall 213 that will become the outer surface of the housing 210, and one end side of the tubular portion 31 (the side closer to the opening of the insertion hole 30a than the flange portion 32) is made to protrude from the surface of the first side wall 213 that will become the inner surface of the housing 210. Next, the rod-shaped portion 41 of the core member 40 is inserted from the opening of the tubular portion 31 into the insertion hole 30a. Next, the insertion hole 34 of the main body portion 30 and the fixing hole 43 of the core member 40 are aligned with each other, and the fastening member 50 is screwed into the fixing hole 43 from the outside of the main body portion 30. As a result, the gas detector 100 is assembled and attached to the first side wall 213. Thereafter, by assembling the housing 210 so that the cell unit 220 is disposed within the housing 210, a battery unit 300 is obtained to which the gas detector 100 is attached and whose interior forms a closed space 210a. The timing for attaching the gas detection tool 100 to the housing 210 may be any time before the housing 210 is completely assembled and as long as the work of attaching the gas detection tool 100 to the through-hole 217 is possible.

[0061] As described above, in this embodiment, the inner placement portion 20 is formed in a rod shape. Also, as described above, the gas detection device 100 has the outer flange portion 12 and the inner flange portion . When the gas detector 100 is pulled out to the limit position towards the outside of the housing 210, the inner flange 23 comes into contact with the inner surface of the housing 210 (see FIG. 5). That is, the surface of the inner flange 23 on the outer flange 12 side comes into contact with the peripheral edge of the through-hole 217 on the inner surface of the first side wall 213. This restricts further pulling out of the gas detector 100. Therefore, in this embodiment, the gas detector 100 cannot be pulled out completely from the housing 210. Here, as shown in FIG. 3(b), the length L1 of the portion (inner main body portion 20a) located between the outer flange portion 12 and the inner flange portion 23 in the inner arrangement portion 20 is longer than twice the length L2 of the through hole 217. As a result, by pulling out the gas detector 100, the detection section 21, which was initially located inside the housing 210 (inside the closed space 210a), can be exposed to the outside of the housing 210.

[0062] As described above, in this embodiment, the inner placement portion 20 has a plurality of sealing portions 22. More specifically, the inner placement portion 20 has a plurality of sealing portions 22 arranged spaced apart from each other in the longitudinal direction of the inner placement portion 20. In the longitudinal direction of the inner disposed portion 20, the distance between the sealed portions formed by the adjacent seal portions 22 (distance D1 shown in FIG. 5) is equal to or smaller than the length dimension L2 of the through hole 217. This ensures that the portion of the inner portion 20 that is inserted into the through hole 217 and the through hole 217 are always airtightly sealed from each other before, during, and after the gas detection device 100 is pulled out. Preferably, the distance D1 is less than the length dimension L2. In this embodiment, the seal portion 22 has a shape in which the outer diameter is greatest at the center of the seal portion 22 in the longitudinal direction of the inner main body portion 20a. Therefore, the sealing location by the seal portion 22 is the center of the seal portion 22 in the longitudinal direction of the inner main body portion 20a. However, in the present invention, the shape of the seal portion 22 is not limited to this example, and may be, for example, a cylindrical shape with a constant outer diameter. In this case, the distance between the sealed points by adjacent seal portions 22 is the separation distance between the adjacent seal portions 22.

[0063] Next, the operation will be described.

[0064] In the initial state, for example, as shown in Figures 3(a) to 4, the outer flange portion 12 of the gas detector 100 is in contact with the outer surface of the housing 210 (the outer surface of the first side wall 213). In other words, the gas detector 100 is in a state where it is inserted most deeply into the housing 210. As a result, all of the detectors 21 are disposed in the closed space 210a. 4, in the initial state, for example, the seal portion 22 located nearest to the outermost flange portion 12 among the multiple seal portions 22 is airtightly sealed to the inner circumferential surface of the through hole 217. That is, in the initial state, the "portion of the inner arrangement portion 20 inserted into the through hole 217" is, for example, the portion including the seal portion 22 located nearest to the outermost flange portion 12. Thereafter, when detecting the presence or absence of generation of the detection target gas in closed space 210a, gas detector 100 is pulled out until at least one detection part 21 is exposed to the outside of housing 210 through through-hole 217. That is, for example, a user grips grip part 11 and manually pulls gas detector 100 out of housing 210 (FIG. 5). For example, FIG. 5 shows a state in which the gas detector 100 has been pulled out until all (three) detection sections 21 are exposed outside the casing 210. In the case of this embodiment, even when the gas detection device 100 is pulled out, the inner flange portion 23 is positioned inside the closed space 210a, and the gas detection device 100 is not pulled out completely. For example, as shown in FIG. 5, when the gas detection device 100 is pulled out until the inner flange portion 23 abuts against the inner surface of the housing 210, the seal portion 22 located closest to the inner flange portion 23 among the multiple seal portions 22 is airtightly sealed against the inner surface of the through hole 217. 4 and 5, the closed space 210a is always kept airtight by one of the seal portions 22. In the intermediate state between the state shown in FIG. In this way, while the gas detection device 100 is being pulled out, the "portion of the inner portion 20 that is inserted into the through hole 217" changes from time to time, but the closed space 210a can always be kept airtight by one of the seal portions 22. Therefore, even if a gas to be detected (for example, hydrogen sulfide) is generated in the closed space 210a, the gas detection device 100 can be pulled out while preventing leakage of the gas to the outside of the casing 210.

[0065] If a gas to be detected (e.g., hydrogen sulfide) is generated in the closed space 210a, the color of the detection unit 21 changes (e.g., changes to black), and the user can recognize that the gas to be detected has been generated by visually checking the color of the detection unit 21. On the other hand, if the gas to be detected has not been generated in the closed space 210a, the color of the detection unit 21 does not change and remains the original color, so the user can visually check the color of the detection unit 21 and recognize that the gas to be detected has not been generated.

[0066] Second Embodiment Next, a second embodiment will be described with reference to FIGS. FIG. 6 is an external view of gas detection device 100 according to this embodiment viewed in a direction perpendicular to its longitudinal direction, and FIG. 7 is a cross-sectional view of gas detection device 100 cut along its central axis (the position of line AA shown in FIG. 6).

[0067] The gas detection device 100 of this embodiment differs from the gas detection device 100 of the first embodiment described above in the points described below, but in other points is configured in the same way as the gas detection device 100 of the first embodiment described above. In the above first embodiment, an example was described in which the detection unit 21 and the sealing unit 22 were arranged at different positions in the longitudinal direction of the inner-positioning unit 20. However, in this embodiment, the detection unit 21 also functions as the sealing unit 22, and the detection unit 21 and the sealing unit 22 are located in the same location. That is, in this embodiment, the inner-positioned portion 20 is formed in a rod shape, and the detection portion 21, which also serves as the sealing portion 22, and a small diameter portion having a smaller diameter than the detection portion 21 are arranged at different positions from each other in the longitudinal direction of the inner-positioned portion 20. In the present embodiment, for example, the detection portion 21 is formed only on the surface layer of the inner portion 20 .

[0068] In this embodiment, the number of detection sections 21 is three, while the number of sealing sections 22 is four. For example, the sealing section 22 located closest to the inner flange section 23 among the four sealing sections 22 does not function as a detection section 21. The small diameter portions are all the portions in the longitudinal direction of the inner main body portion 20a of the inner disposition portion 20 excluding the portions where the seal portions 22 are formed. In the case of this embodiment, a total of five portions are small diameter portions: portions located between adjacent seal portions 22 (three portions in total), a portion located between the seal portion 22 located closest to the outer flange portion 12 and the outer flange portion 12, and a portion located between the seal portion 22 located closest to the inner flange portion 23 and the inner flange portion 23.

[0069] Although the embodiments have been described above with reference to the drawings, these are merely examples of the present invention, and various configurations other than those described above can also be adopted.

[0070] For example, in the above description, an example has been described in which the gas detector 100 has a plurality of detector units 21, but the number of detector units 21 may be one. Further, in the above, an example has been described in which the gas detection device 100 has a plurality of sealing portions 22, but the entire portion of the inner placement portion 20 that can be placed inside the through-hole 217 may be a single sealing portion 22. The simplest structure of gas detector 100 can be exemplified by a structure in which gas detector 100 is constituted by a single rod-shaped member that serves both as detection section 21 and sealing section 22.

[0071] In the above, an example in which the detection unit 21 is configured from an elastic body (a part of the main body 30) has been described, but the detection unit 21 does not have to be an elastic body. For example, the detection unit 21 may be configured by attaching (bonding) a metal film to the outer surface of an elastic body having the seal portion 22 other than the portion that functions as the seal portion 22. In addition, the main body 30 may be constructed by insert molding in which the detection unit 21 (the metal constituting the detection unit 21, or the resin or elastomer containing a coloring agent and constituting the detection unit 21) is inserted into a material constituting the parts of the main body 30 other than the detection unit 21.

[0072] In the above, an example has been described in which the portion of the inner arrangement portion 20 inserted into the through hole 217 and the through hole 217 are airtightly sealed by the seal portion 22 even in a state in which the detection portion 21 is exposed to the outside of the housing 210, but the present invention is not limited to this example, and the sealing property by the seal portion 22 does not necessarily have to be obtained in a state other than the initial state (when the detection portion 21 is exposed to the outside of the housing 210). In this case as well, by exposing the detection portion 21 to the outside of the housing 210 and checking the color change of the detection portion 21, it is possible to detect the generation of gas in the housing 210 without using an electrical method and before the housing 210 is disassembled.

[0073] Furthermore, in the above description, an example has been described in which the gas detector 100 includes the core member 40, but the gas detector 100 does not necessarily have to include the core member 40. In this case, the inner flange portion 23 can be made detachable from, for example, the end face of the inner main body portion 20a on the side farther from the outer arrangement portion 10. In the above, an example has been described in which the core member 40 has the inner flange portion 23 (flange portion 42) integrally therewith, but the inner flange portion 23 may be configured as a separate member from the core member 40. In this case, for example, the inner flange portion 23 may be detachable from the end face of the core member 40 (rod-shaped portion 41) on the side farther from the outer arrangement portion 10.

[0074] The present embodiment encompasses the following technical ideas. (1) An outer arrangement part that is arranged outside a housing that defines a closed space; An inner arrangement portion that is arranged from an inside of a through hole that penetrates the inside and outside of the housing to an inside of the closed space; A gas detection device integrally comprising: The inner arrangement portion is A detection unit that changes color when it comes into contact with a gas to be detected; a seal portion that air-tightly seals a portion of the inner portion that is inserted into the through hole and the through hole when at least a portion of the detection portion is disposed inside the closed space; having The gas detector is configured so as to be removable until the detection portion is exposed to the outside of the housing through the through hole. (2) The gas detector has a main body made of an elastic material, The gas detection device according to (1), wherein the main body portion has the sealing portion and the detection portion. (3) A gas detection device as described in (2) above, comprising a core member that is made of a material having higher rigidity than the main body portion and is arranged from the inside of the outer portion to the inside of the inner portion. (4) A gas detection device as described in any one of (1) to (3), wherein the sealing portion hermetically seals the portion of the inner portion that is inserted into the through hole and the through hole, even when the detection portion is exposed to the outside of the housing. (5) The inner portion is formed in a rod shape, the seal portion and the detection portion are disposed at different positions from each other in a longitudinal direction of the inner portion, The gas detection device according to any one of (1) to (4), wherein the sealing portion is formed with a diameter larger than that of the detection portion. (6) The inner portion is formed in a rod shape, The gas detection device according to any one of (1) to (4), wherein the detection portion, which also serves as the sealing portion, and a small diameter portion having a smaller diameter than the detection portion are arranged at different positions from each other in the longitudinal direction of the inner portion. (7) The gas detection device according to any one of (1) to (6), wherein the inner arrangement portion has a plurality of the detection portions each having a different detection sensitivity. (8) The gas detection device according to any one of (1) to (7), wherein the inner arrangement portion has a plurality of detection portions each detecting a different type of gas to be detected. (9) The outer arrangement portion has a grip portion to be gripped by a user, The gas detection device according to any one of (1) to (8), wherein the detection portion is exposed to the outside of the housing through the through hole when the grip portion is pulled in a direction away from the housing. (10) The gas detection device according to any one of (1) to (9), wherein the detection section includes a polymeric material, a coloring agent that changes color when in contact with hydrogen sulfide, and a color reaction accelerator. (11) A gas detection device according to any one of (1) to (10), The housing; A cell unit disposed in the housing; Equipped with A battery unit in which the gas detection device is attached to the housing, the outer arrangement portion is arranged outside the housing, and the inner arrangement portion is arranged extending from the inside of the through hole to the inside of the closed space. (12) A battery unit as described in (11), wherein the end portion of the outer placement portion on the inner placement portion side is formed to a dimension such that it cannot pass through the through hole and has an outer flange portion that can abut against the outer surface of the housing. (13) The inner portion is formed in a rod shape, A battery unit as described in (11) or (12), wherein a portion of the inner arrangement portion located farther from the outer arrangement portion than the detection portion is formed with dimensions such that it cannot pass through the through hole and has an inner flange portion that can abut against the inner surface of the housing. (14) The inner portion is formed in a rod shape, a portion of the inner portion that is located farther from the outer portion than the detection portion is, and the inner flange portion has a dimension such that the inner flange portion cannot pass through the through hole; the inner flange portion comes into contact with an inner surface of the housing when the gas detector is pulled out to a limit position toward the outside of the housing, The battery unit according to (12), wherein a length dimension of a portion of the inner arrangement portion located between the outer flange portion and the inner flange portion is longer than twice a length dimension of the through hole. (15) The inner disposed portion has a plurality of the seal portions spaced apart from each other in a longitudinal direction of the inner disposed portion, The battery unit according to (14), wherein the distance between the sealed points of the adjacent sealing portions in the longitudinal direction of the inner portion is equal to or less than the length of the through hole. [Explanation of symbols]

[0075] 100 Gas detector 10 Outer placement part 11 Gripping part 11a Grip body 11b Grip end 12 Outer collar 20 Inner placement part 20a Inner body part 21 Detection unit 21a First detection section 21b Second detection section 21c Third detection section 22 Seal part 23 Inner flange 30 Main body 30a Insertion hole 31 Cylindrical part 32 Flange 33 Large diameter section 34 Insertion hole 40 Core material 41 Rod-shaped part 42 Flange 43 Fixing hole 50 Fastening member 200 Battery 210 Cabinet 210a Confined Space 211 Bottom plate 212 Tabletop 213 First side wall 214 Second Side Wall 215 3rd side wall 216 4th side wall 217 Through hole 220 cell unit 300 Battery Unit

Claims

1. An outer arrangement part that is arranged outside a housing that defines a closed space; An inner arrangement portion that is arranged from an inside of a through hole that penetrates the inside and outside of the housing to an inside of the closed space; A gas detection device integrally comprising: The inner arrangement portion is A detection unit that changes color when it comes into contact with a gas to be detected; a seal portion that air-tightly seals a portion of the inner portion that is inserted into the through hole and the through hole when at least a portion of the detection portion is disposed inside the closed space; having The gas detector is configured so as to be removable until the detection portion is exposed to the outside of the housing through the through hole.

2. The gas detection device includes a main body made of an elastic body, 2. The gas detection device according to claim 1, wherein the main body portion has the seal portion and the detection portion.

3. 3. The gas detection device according to claim 2, further comprising a core member which is made of a material having higher rigidity than said main body portion and which is disposed from the inside of said outer portion to the inside of said inner portion.

4. 4. A gas detection device as claimed in claim 1, wherein the sealing portion hermetically seals the portion of the inner portion that is inserted into the through hole and the through hole, even when the detection portion is exposed to the outside of the housing.

5. The inner portion is formed in a rod shape, the seal portion and the detection portion are disposed at different positions from each other in a longitudinal direction of the inner portion, The gas detection device according to claim 1 , wherein the seal portion is formed to have a diameter larger than that of the detection portion.

6. The inner portion is formed in a rod shape, 4. The gas detection device according to claim 1, wherein the detection portion, which also serves as the sealing portion, and a small diameter portion having a smaller diameter than the detection portion are arranged at different positions from each other in the longitudinal direction of the inner portion.

7. 4. The gas detection device according to claim 1, wherein the inner portion has a plurality of the detection sections each having a different detection sensitivity.

8. 4. The gas detection device according to claim 1, wherein the inner portion has a plurality of detection sections each detecting a different type of gas to be detected.

9. The outer placement portion has a grip portion to be gripped by a user, The gas detector according to claim 1 , wherein the detection portion is exposed to the outside of the housing through the through hole by pulling the grip portion in a direction away from the housing.

10. 4. The gas detection tool according to claim 1, wherein the detection section includes a polymer material, a coloring agent that changes color when in contact with hydrogen sulfide, and a color reaction accelerator.

11. The gas detector according to any one of claims 1 to 3, The housing; A cell unit disposed in the housing; Equipped with A battery unit in which the gas detection device is attached to the housing, the outer arrangement portion is arranged outside the housing, and the inner arrangement portion is arranged extending from the inside of the through hole to the inside of the closed space.

12. The battery unit according to claim 11 , wherein the end of the outer portion on the inner portion side is formed to a dimension such that it cannot pass through the through hole and has an outer flange portion capable of abutting against an outer surface of the housing.

13. The inner portion is formed in a rod shape, The battery unit described in claim 11, wherein a portion of the inner portion located farther from the outer portion than the detection portion is formed with dimensions such that it cannot pass through the through hole and has an inner flange portion that can abut against the inner surface of the housing.

14. The inner portion is formed in a rod shape, a portion of the inner portion that is located farther from the outer portion than the detection portion is, and the inner flange portion has a dimension such that the inner flange portion cannot pass through the through hole; the inner flange portion comes into contact with an inner surface of the housing when the gas detector is pulled out to a limit position toward the outside of the housing, The battery unit according to claim 12 , wherein a length of the portion of the inner disposed portion located between the outer flange portion and the inner flange portion is longer than twice a length of the through hole.

15. The inner portion has a plurality of the seal portions arranged spaced apart from each other in a longitudinal direction of the inner portion, The battery unit according to claim 14 , wherein a distance between sealed portions formed by adjacent ones of the sealing portions in the longitudinal direction of the inner portion is equal to or less than a length dimension of the through hole.

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