Pressure regulating valve

Abstract

To provide a pressure regulating valve that is less likely to deform with the force from the outside.SOLUTION: An explosion-proof valve 1 includes: an umbrella-shaped valve element 10 formed from an elastomer; and a cloth body 20 formed from a cloth. The cloth body 20 is fitted to the valve element 10. The cloth body 20 is configured such that the valve element 10 is less likely to deform with the force that is added from the outside.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a pressure regulating valve. [Background technology]

[0002] In a battery device having a storage module such as a lithium-ion battery, gas such as hydrogen may be generated during use due to, for example, over-discharge, which may cause the pressure in the internal space of each cell of the storage module to rise, resulting in the explosion of the cell. In order to prevent such an increase in pressure in the internal space of the cell, some conventional storage modules have an explosion-proof valve, which is a pressure regulating valve that opens the internal space when the pressure in the internal space rises (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 064843 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, the explosion-proof valve as described above has an umbrella-shaped rubber valve body. In this type of umbrella-shaped valve body, the opening hole that opens the internal space formed in the casing of each cell is covered with the inside of the umbrella-shaped valve body, and the outer periphery of the valve body is in contact with the casing. In addition, the umbrella-shaped valve body is formed so that when a large force is applied to the inside of the umbrella-shaped valve body, the outer periphery deforms so as to separate from the casing. As a result, when the pressure in the internal space of the cell increases, the outer periphery of the umbrella-shaped valve body separates from the casing, the internal space of the cell is opened, and the increase in pressure in the internal space of the cell is suppressed.

[0005] On the other hand, the battery device may be attached to a vehicle so as to be exposed to the outside, and in this case, a force may be applied to the umbrella-shaped valve body from the outside. For example, high-pressure water sprayed from a high-pressure washer may hit the umbrella-shaped valve body. In this case, the high-pressure water hits the umbrella-shaped valve body, and high water pressure is applied to the outer surface of the umbrella-shaped valve body, causing the umbrella-shaped valve body to deform, and the outer periphery of the umbrella-shaped valve body to separate from the casing, releasing the internal space of the cell and allowing water to enter the cell. For this reason, some conventional battery devices are provided with a cover that covers the explosion-proof valve in order to prevent a force from being applied to the explosion-proof valve from the outside.

[0006] On the other hand, due to the demands for reducing the number of parts and saving space, there is a demand for eliminating the need for a cover that covers the explosion-proof valve. For this reason, explosion-proof valves having an umbrella-shaped valve body are required to be configured so that they will not open even if a force of a magnitude expected in the usage environment is applied from the outside.

[0007] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a pressure regulating valve that is less likely to deform when subjected to an external force. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the pressure regulating valve of the present invention comprises an umbrella-shaped valve body formed from an elastic material and a cloth body formed from cloth, the cloth body being attached to the valve body such that the valve body is less likely to deform due to forces applied from the outside.

[0009] In the pressure regulating valve according to one aspect of the present invention, the fabric body is adapted to be pulled by a force applied from the outside.

[0010] In the pressure regulating valve according to one aspect of the present invention, the fabric body is attached to a portion of the valve body where tensile stress occurs when the valve body is deformed by a force applied from the outside.

[0011] In one aspect of the pressure regulating valve of the present invention, the cloth body is attached to a portion of the valve body where maximum tensile stress occurs when the valve body is deformed by a force applied from the outside, and in the vicinity of the portion of the valve body where maximum tensile stress occurs.

[0012] In the pressure regulating valve according to one aspect of the present invention, the fabric body is shaped so as to be pulled by a force applied from the outside.

[0013] In the pressure regulating valve according to one aspect of the present invention, the fabric body is configured so that the valve body is not easily deformed by a force applied from the inside.

[0014] In the pressure regulating valve according to one aspect of the present invention, the fabric body is not attached to a portion of the valve body where tensile stress occurs when the valve body is deformed by a force applied from the inside.

[0015] In one embodiment of the pressure regulating valve of the present invention, the cloth body is not attached to the part of the valve body where the maximum tensile stress occurs when the valve body is deformed by a force applied from the inside, or in the vicinity of the part of the valve body.

[0016] In the pressure regulating valve according to one aspect of the present invention, the fabric body is attached to a portion of the valve body where compressive stress occurs when the valve body is deformed by a force applied from the inside.

[0017] In a pressure regulating valve according to one aspect of the present invention, the fabric body is attached to an outwardly facing surface of the valve body.

[0018] In the pressure regulating valve according to one aspect of the present invention, the fabric body is attached to a surface of the valve body facing inward, from a radially middle portion of the valve body to an outer circumferential portion.

[0019] In the pressure regulating valve according to one aspect of the present invention, the cloth is formed from fibers.

[0020] In the pressure regulating valve according to one aspect of the present invention, the fabric is a base fabric, a woven fabric, or a nonwoven fabric.

[0021] In a pressure regulating valve according to one aspect of the present invention, the valve body has a shape that expands in diameter from the outside to the inside along an axis, and a cross-section of the valve body taken along a plane including the axis follows the outwardly convex arc. Effect of the Invention

[0022] According to the present invention, it is possible to provide a pressure regulating valve that is less likely to be deformed by an external force. [Brief description of the drawings]

[0023] [Figure 1] 1 is a perspective view showing an explosion-proof valve as a pressure regulating valve according to an embodiment of the present invention; [Diagram 2] FIG. 2 is another perspective view showing a schematic diagram of an explosion-proof valve as a pressure regulating valve according to an embodiment of the present invention. [Diagram 3] 2 is a cross-sectional view showing a cross section along a plane including an axis of the explosion-proof valve shown in FIG. 1. [Figure 4] 2 is a cross-sectional view showing a state in which the explosion-proof valve shown in FIG. 1 is used, the cross-sectional view being attached to a casing of a cell of an electricity storage module to which the explosion-proof valve shown in FIG. 1 is applied. [Diagram 5] 5 is a diagram showing an example of a through hole provided in the casing shown in FIG. 4. FIG. [Figure 6] 2 is a diagram for explaining the action of the explosion-proof valve shown in FIG. 1 in opening the internal space of the cell. FIG. [Figure 7] 13 is a diagram for explaining the state of a membrane portion of a valve body to which no fabric body is attached when a pressing force is applied from the outside. FIG. [Figure 8] A partial cross-sectional view of a valve body showing the tensile stress that is thought to occur within a membrane portion when an upward force is applied from the inside to a membrane portion to which no cloth body is attached while the release hole is closed. [Figure 9]FIG. 1 is a partial cross-sectional view of a valve body showing the tensile stress thought to occur within a membrane portion when a pushing force applied from the inside to a membrane portion to which no cloth body is attached causes the membrane portion to deform so that the sealing surface moves away from the casing. [Figure 10] A partial cross-sectional view of a valve body showing the tensile stress that is thought to occur within a membrane portion when a pressing force is applied from the outside to a membrane portion to which no cloth body is attached when the open hole is closed. [Figure 11] A partial cross-sectional view of a valve body showing the tensile stress that is thought to occur within a membrane portion when a pressing force is applied from the outside to a membrane portion to which no cloth body is attached when the open hole is closed. [Figure 12] A partial cross-sectional view of a valve body showing the tensile stress that is thought to occur within a membrane portion when a pressing force is applied from the outside to a membrane portion to which no cloth body is attached when the open hole is closed. [Figure 13] FIG. 13 is a diagram for explaining the attachment position of the fabric body which is considered to affect the lifting force and the pressing force. [Figure 14] FIG. 2 is a cross-sectional view of a modified example of the explosion-proof valve shown in FIG. [Figure 15] FIG. 13 is a top view of an explosion-proof valve according to a modified example. [Figure 16] FIG. 13 is a top view of an explosion-proof valve according to a modified example. [Figure 17] FIG. 13 is a top view of an explosion-proof valve according to a modified example. [Figure 18] FIG. 13 is a top view of an explosion-proof valve according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] The pressure regulating valve according to the present invention is, for example, an explosion-proof valve. The explosion-proof valve is, for example, a pressure regulating valve that opens an internal space when the pressure in the internal space of each cell of an electricity storage module increases in a battery device having an electricity storage module such as a lithium ion battery, in order to prevent an increase in pressure in the internal space of the battery module. Hereinafter, the pressure regulating valve according to the present invention will be described by specifically describing an explosion-proof valve, which is one embodiment of the pressure regulating valve according to the present invention, but the pressure regulating valve according to the present invention is not limited to the explosion-proof valve and includes other valves.

[0026] 1 and 2 are perspective views that show a schematic cross section of an explosion-proof valve 1 as a pressure regulating valve according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a cross section of the explosion-proof valve 1 along a plane including the axis x. FIG. 1 shows the explosion-proof valve 1 from the outside, and FIG. 2 shows the explosion-proof valve 1 from the inside. The outside is a side in one direction in the axis x direction of the explosion-proof valve 1, and the inside is a side in the other direction in the axis x direction. The axis x is a virtual line, and is the central axis of the explosion-proof valve 1. As shown in FIGS. 1 to 3, the explosion-proof valve 1 includes an umbrella-shaped valve body 10 formed from an elastic material and a cloth body 20 formed from cloth. The cloth body 20 is attached to the valve body 10. The cloth body 20 is designed so that the valve body 10 is less likely to be deformed by a force applied from the outside. The configuration of the explosion-proof valve 1 will be specifically described below.

[0027] The fabric body 20 is adapted to be pulled by a force applied to the explosion-proof valve 1 from the outside, for example. Specifically, for example, the fabric body 20 is attached to a portion of the valve body 10 where tensile stress occurs when the valve body 10 is deformed by a force applied from the outside, or to a portion of the valve body 10 where tensile stress is estimated to occur. In addition, the fabric body 20 is adapted to prevent the valve body 10 from being easily deformed by a force applied from the inside, for example. Specifically, for example, the fabric body 20 is not attached to a portion of the valve body 10 where tensile stress occurs when the valve body 10 is deformed by a force applied from the inside, or to a portion of the valve body 10 where tensile stress is estimated to occur. In addition, the fabric body 20 is not attached to a portion of the valve body 10 where tensile stress mainly occurs when the valve body 10 is deformed by a force applied from the inside, or to a portion of the valve body 10 where tensile stress mainly occurs when the valve body 10 is deformed by a force applied from the inside. Specifically, for example, the fabric body 20 is not attached to the part of the valve body 10 where the maximum tensile stress occurs or where the maximum tensile stress is expected to occur when the valve body 10 is deformed by a force applied from the inside, or in the vicinity of that part of the valve body 10.

[0028] In addition, "attached to a portion of the valve disc 10 where tensile stress occurs or a portion of the valve disc 10 where tensile stress is estimated to occur" includes "attached to all of the portions of the valve disc 10 where tensile stress occurs or all of the portions of the valve disc 10 where tensile stress is estimated to occur" and "attached to a portion of the portion of the valve disc 10 where tensile stress occurs or a portion of the portion of the valve disc 10 where tensile stress is estimated to occur". Similarly, "not attached to a portion of the valve disc 10 where tensile stress occurs or a portion of the valve disc 10 where tensile stress is estimated to occur" includes "not attached to all of the portions of the valve disc 10 where tensile stress occurs or all of the portions of the valve disc 10 where tensile stress is estimated to occur" and "not attached to a portion of the portion of the valve disc 10 where tensile stress occurs or a portion of the valve disc 10 where tensile stress is estimated to occur".

[0029] 1 to 3, the valve body 10 is an umbrella-shaped member made of an elastic material, and is formed to close or open an opening that opens the internal space of the cell of the electricity storage module, which is the space to be sealed, when the explosion-proof valve 1 is in use, which will be described later. The valve body 10 has, for example, a membrane portion 11 and a base portion 15.

[0030] The membrane part 11 is a membrane-like part formed to cover the open hole of the cell in the use state. As shown in Figs. 1 to 3, the membrane part 11 spreads in an annular shape around the axis x and has an umbrella-like shape. For example, the membrane part 11 has a shape that expands in diameter from the outside to the inside along the axis x, and a cross section taken along a plane including the axis x follows an arc that is convex outward. As shown in Figs. 2 and 3, the membrane part 11 has a sealing surface 12, which is an annular surface facing inward, at the inner end. The sealing surface 12 forms an opening that opens the space defined inside by the valve body 10. In addition, the sealing surface 12 is adapted to contact the cell on the outer periphery side of the open hole in the use state. The membrane part 11 is connected to the base part 15 at the outer annular end 11a.

[0031] Specifically, for example, as shown in FIG. 3, the membrane portion 11 has a shape in which the cross-sectional contour follows a circular arc or an approximately circular arc. Specifically, for example, as shown in FIG. 3, the membrane portion 11 has a constant or approximately constant thickness. The thickness of the membrane portion 11 is the width between the outer surface 13, which is the surface facing the outside of the membrane portion 11, and the inner surface 14, which is the surface facing the inside of the membrane portion 11. Specifically, for example, as shown in FIG. 2 and FIG. 3, the seal surface 12 extends on a plane parallel or approximately parallel to a plane perpendicular to the axis x. Specifically, for example, the seal surface 12 extends along a circle or an approximately circle centered or approximately centered on the axis x.

[0032] The base 15 is a part that supports the membrane part 11, and the outer end 11a of the membrane part 11 is connected to the upper end of the base 15. The base 15 has a columnar shape extending along the axis x, and has an upper surface 16 that faces upward, a lower surface 17 that faces downward, and a side surface 18 that is a cylindrical surface extending between the upper surface 16 and the lower surface 17. The base 15 also has a recess 16a that is recessed from the upper surface 16 to the lower surface side. In a usage state, the membrane part 11 is connected to a position of the base 15 such that the sealing surface 12 of the membrane part 11 is pressed downward against the cell with the lower surface 17 of the base 15 in contact with the cell. For example, as shown in FIG. 3, the membrane part 11 is connected to the base 15 so that the upper surface 16 of the base 15 and the outer surface 13 of the membrane part 11 are flush or approximately flush with each other.

[0033] As described above, the valve body 10 is made of an elastic material. The elastic material is, for example, rubber or elastomer. The valve body 10 is integrally formed from the same material, and the membrane portion 11 and the base portion 15 are each parts of the valve body 10 that are integrally formed and are connected together.

[0034] The explosion-proof valve 1 also has a fixing member 30 that is a member for fixing the valve body 10 to the cell. The fixing member 30 is, for example, a pin 30 as shown in Figs. 1 to 3. The pin 30 penetrates the base 15, and is capable of fixing the base 15 to the cell. The base 15 may have a through hole through which the pin 30 passes.

[0035] The fabric body 20 is formed from a cloth made from fibers. Specifically, the fibers are woven to make the cloth. The fabric has a specific shape to form the fabric body 20. The fibers are, for example, synthetic fibers, specifically, for example, polyester fibers. The fibers of the fabric forming the fabric body 20 are not limited to synthetic fibers, and may be other fibers such as natural fibers such as vegetable fibers, or fibers that combine synthetic and natural fibers. The fabric forming the fabric body 20 is, for example, a base fabric, a woven fabric, or a nonwoven fabric.

[0036] The fabric body 20 is formed, for example, by copying a shape of the fabric corresponding to the outer surface 13 of the membrane part 11 of the valve body 10, and is attached to the outer surface 13 of the membrane part 11 of the valve body 10 as shown in Figures 1 and 3. Specifically, for example, the fabric body 20 is attached to the entire or substantially the entire outer surface 13 of the membrane part 11. The fabric body 20 may extend to the upper surface 16 of the base part 15 of the valve body 10 and be attached to the upper surface 16.

[0037] The fabric body 20 is fixed to the valve body 10, for example, by the elastic material of the valve body 10 entering into the weave of the fabric body 20. The fabric body 20 is, for example, placed in a mold for molding the valve body 10, and attached to the surface of the membrane portion 11 of the valve body 10 when the valve body 10 is formed in the mold. Note that the method of attaching the fabric body 20 to the valve body 10 is not limited to this.

[0038] FIG. 4 is a cross-sectional view showing a state in which the explosion-proof valve 1 is attached to a casing 101 of a cell 100 of a power storage module to which the explosion-proof valve 1 is applied, in use. FIG. 5 is a schematic diagram showing an example of an opening hole 102 provided in the casing 101. As shown in FIGS. 4 and 5, the casing 101 of the cell 100 is provided with an opening hole 102 that opens the internal space of the cell 100, and the explosion-proof valve 1 is attached to the casing 101 so as to cover the opening hole 102. The explosion-proof valve 1 is fixed to the casing 101 by having a pin 30 engaged with an engaging portion 103 provided in the casing 101.

[0039] As shown in FIG. 4, in the use state, the base 15 of the valve body 10 of the explosion-proof valve 1 is fixed to the casing 101 by the pin 30 with the lower surface 17 in contact with the locking portion 103 of the casing 101. The outer end of the pin 30 is locked in the recess 16a of the base 15. The pin 30 is locked to the locking portion 103 of the casing 101 and fixed to the casing 101. In addition, in the use state, the membrane portion 11 of the valve body 10 covers the release hole 102 from the outside, and the seal surface 12 of the membrane portion 11 is in contact with the casing 101 on the outer circumferential side of the release hole 102. In this way, in the use state, the explosion-proof valve 1 closes the release hole 102.

[0040] In a use state, when the pressure in the internal space of the casing 101 rises, the pressure applied to the inner surface 14 of the membrane part 11 of the valve body 10 rises, and the push-up force F1, which is a force applied from the inside to the membrane part 11 of the valve body 10, rises. As shown in FIG. 6, the push-up force F1 is a force that presses the membrane part 11 from the inside. When the push-up force F1 rises to a magnitude that deforms the membrane part 11 so that the seal surface 12 moves away from the casing 101, the membrane part 11 deforms and the seal surface 12 moves away from the casing 101. This opens the release hole 102, opens the internal space of the cell 100, and the gas in the internal space of the cell 100 is released to the outside through the release hole 102. In this way, the explosion-proof valve 1 suppresses the internal pressure of the cell 100 from continuing to rise, and prevents the cell 100 from bursting.

[0041] On the other hand, in the explosion-proof valve 1 with the release hole 102 closed (see FIG. 4), a pressing force F2 may be applied to the membrane part 11 of the valve body 10, for example, when high-pressure water ejected from a high-pressure cleaner hits the outer surface 13 of the membrane part 11 of the valve body 10 (see FIG. 7). The pressing force F2 is a force applied from the outside to the membrane part 11 of the valve body 10. FIG. 7 is a diagram for explaining the state of the membrane part 11 when a pressing force F2 from the outside is applied to the membrane part 11 of the valve body 10 to which the fabric body 20 is not attached. As shown in FIG. 7, when a pressing force F2 of a magnitude that deforms the membrane part 11 so that the seal surface 12 moves away from the casing 101 is applied to the outer surface 13 of the membrane part 11, the membrane part 11 is deformed and the seal surface 12 moves away from the casing 101. As a result, the open hole 102 is opened, the internal space of the cell 100 is opened, and foreign matter such as water can flow into the internal space of the cell 100.

[0042] Here, Fig. 8 is a partial cross-sectional view of the valve body 10 showing the state of tensile stress estimated to occur in the membrane part 11 when a push-up force F1 is applied from the inside to the membrane part 11 to which the fabric body 20 is not attached with the open hole 102 closed. Also, Fig. 9 is a partial cross-sectional view of the valve body 10 showing the state of tensile stress estimated to occur in the membrane part 11 when the membrane part 11 to which the fabric body 20 is not attached is deformed so that the seal surface 12 moves away from the casing 101 due to the push-up force F1 applied from the inside to the membrane part 11 to which the fabric body 20 is not attached (hereinafter, this state is also referred to as the "depressurized open valve state").

[0043] As shown in Fig. 8, when the open hole 102 is closed, it is estimated that high tensile stress is generated near the inner surface 14 and the inner surface 14 near the end 11a and the end 11a, which are the portions where the membrane portion 11 is connected to the base portion 15. Also, as shown in Fig. 8, when the open hole 102 is closed, it is estimated that the maximum tensile stress is generated near the inner surface 14 and the inner surface 14 near the end 11a and the end 11a of the membrane portion 11.

[0044] 9, in the depressurized open valve state, it is estimated that high tensile stress occurs at the inner surface 14 and the vicinity of the inner surface 14 in the vicinity of the end 11a and the end 11a of the membrane portion 11. It is estimated that the maximum tensile stress occurs at the inner surface 14 and the vicinity of the inner surface 14 in the vicinity of the end 11a and the end 11a of the membrane portion 11.

[0045] On the other hand, Figures 10 to 12 are partial cross-sectional views of the valve body 10 showing the tensile stress estimated to occur within the membrane portion 11 when a pressing force F2 is applied from the outside to the membrane portion 11 to which the cloth body 20 is not attached when the open hole 102 is closed.

[0046] As shown in Figure 10, when the open hole 102 is closed and the angle at which the pressing force F2 is applied is 0°, that is, when the pressing force F2 is applied from the outside in a direction perpendicular to the axis x, it is estimated that tensile stress is generated near the outer surface 13 and the outer surface 13 in the radial center of the membrane portion 11.

[0047] 11, when the pressing force F2 is applied from the outside to the membrane portion 11 at an angle of 45° with the open hole 102 closed, that is, when the pressing force F2 is applied at an angle of 45° with respect to the axis x, it is estimated that high tensile stress occurs near the inner surface 14 and the inner surface 14 in the portion closer to the seal surface 12 than the vicinity of the center in the radial direction of the membrane portion 11. It is also estimated that the maximum tensile stress occurs near the inner surface 14 and the inner surface 14 in the portion between the vicinity of the center in the radial direction of the membrane portion 11 and the seal surface 12.

[0048] 12, when the angle at which the pressing force F2 is applied is 90° in a state in which the open hole 102 is closed, that is, when the pressing force F2 is applied from the outside in a direction parallel to the axis x to the membrane portion 11, it is estimated that tensile stress is generated on the inner surface 14 and the vicinity of the inner surface 14 in almost the entire membrane portion 11. It is also estimated that high tensile stress is generated on the inner surface 14 and the vicinity of the inner surface 14 in the radial center of the membrane portion 11, and that the maximum tensile stress is generated.

[0049] 8 to 12, the shade of the color (shade) of the film portion 11 represents the level of stress, and the lighter the color (shade) of the film portion 11, the higher the stress generated. The stress distribution generated in the film portion 11 as shown in Figs. 8 to 12 can be obtained by simulation.

[0050] Fig. 13 is a diagram for explaining the attachment position of the fabric body 20 which is considered to affect the push-up force F1 and the pressing force F2. From the state of the tensile stresses estimated to occur in the membrane portion 11 shown in Figs. 8 to 12 described above, as shown in Fig. 13, the end 11a of the membrane portion 11 and the region (region R1) near the inner surface 14 and the inner surface 14 at the vicinity of the end 11a are considered to be positions where the rigidity of the membrane portion 11 against the push-up force F1 increases when the fabric body 20 is attached. Also, as shown in Fig. 13, the region (region R2) from the vicinity of the center in the radial direction of the membrane portion 11 to the seal surface 12 is considered to be a position where the rigidity of the membrane portion 11 against the pressing force F2 increases when the fabric body 20 is attached.

[0051] This is because the fabric body 20 resists deformation that generates tensile stress, but does not resist deformation that generates compressive stress. Therefore, when it is desired to increase the rigidity of the membrane part 11 against a certain external force, the fabric body 20 can be attached to a portion of the membrane part 11 that generates tensile stress and deforms due to a certain external force, or to the vicinity of that portion, to increase the rigidity of the membrane part 11 against the certain external force. On the other hand, when the fabric body 20 is not attached to a portion of the membrane part 11 that generates tensile stress and deforms due to a certain external force, or when the fabric body 20 is attached to a portion of the membrane part 11 that generates compressive stress and deforms due to a certain external force, or to the vicinity of that portion, the effect on the rigidity of the membrane part 11 against the certain external force can be eliminated or reduced. Therefore, the portion of the membrane part 11 where tensile stress is generated by the push-up force F1 and its vicinity are considered to be positions where the rigidity of the membrane part 11 against the push-up force F1 is increased when the fabric body 20 is attached. On the other hand, the portion of the membrane 11 where tensile stress is generated by the pressing force F2 and its vicinity are considered to be positions where the rigidity of the membrane 11 against the pressing force F2 is increased when the fabric body 20 is attached. For this reason, the regions R1 and R2 shown in Fig. 13 can be set.

[0052] As described above, in the explosion-proof valve 1, the fabric body 20 is attached to the entire or almost entire outer surface 13 of the membrane portion 11 of the valve body 10, and the fabric body 20 is not attached to the inner surface 14 of the membrane portion 11. Therefore, the fabric body 20 increases the rigidity of the membrane portion 11 against the pressing force F2 without increasing the rigidity of the membrane portion 11 against the pushing force F1, or while suppressing an increase in the rigidity of the membrane portion 11 against the pushing force F1. As a result, the membrane portion 11 is less likely to be deformed by the pressing force F2 without affecting the depressurization opening function as the explosion-proof valve 1 for depressurizing the cell 100, or while suppressing an effect on the depressurization opening function. Therefore, the pressing force F2 required to deform the membrane portion 11 so that the seal surface 12 is separated from the casing 101 can be increased, and the membrane portion 11 can be made less likely to be deformed by the pressing force F2. As a result, when the membrane portion 11 receives the pressing force F2 from the outside, it is possible to suppress the intrusion of foreign matter into the inside of the cell 100.

[0053] In this way, the explosion-proof valve 1 according to the embodiment of the present invention can be made less susceptible to deformation due to external forces.

[0054] Fig. 14 is a cross-sectional view of the explosion-proof valve 1 according to the modified example. As shown in Fig. 14, in the explosion-proof valve 1 according to the modified example, the fabric body 21 is also attached to the inner surface 14 of the portion (region R2) from the vicinity of the center of the membrane part 11 to the seal surface 12. The fabric body 21 is formed from the same fabric as the above-mentioned fabric body 20, and the fabric is modeled after a shape corresponding to the inner surface 14 of the portion from the vicinity of the center of the membrane part 11 to the seal surface 12. In addition, the fabric body 21 is attached to the entire or substantially the entire inner surface 14 of the portion (region R2) from the vicinity of the center of the membrane part 11 to the seal surface 12.

[0055] As described above, when the angle at which the pressing force F2 is applied is 45°, a higher tensile stress is generated in the portion of the membrane part 11 closer to the seal surface 12 than in the vicinity of the center, and a higher tensile stress is generated in the vicinity of the inner surface 14 and the inner surface 14, and it is estimated that the maximum tensile stress is generated (see FIG. 11). Also, when the angle at which the pressing force F2 is applied is 90°, a higher tensile stress is generated in the vicinity of the inner surface 14 and the inner surface 14 of the membrane part 11, and it is estimated that the maximum tensile stress is generated in the vicinity of the inner surface 14 and the inner surface 14 near the center in the radial direction of the membrane part 11 (see FIG. 12). Therefore, by attaching the fabric body 21 to the entire or substantially entire inner surface 14 (region R2, see FIG. 13) from the vicinity of the center of the membrane part 11 to the seal surface 12, the pressing force F2 required to deform the membrane part 11 so that the seal surface 12 is separated from the casing 101 can be made larger, and the membrane part 11 can be made less likely to be deformed by the pressing force F2. On the other hand, the fabric body 21 attached to the entire or almost the entire inner surface 14 from near the center of the membrane portion 11 to the sealing surface 12 (region R2, see Figure 13) does not increase the rigidity of the membrane portion 11 against the upward force F1, or reduces the increase in rigidity of the membrane portion 11 against the upward force F1.

[0056] Also, the explosion-proof valve 1 may not have the fabric body 20 and may have only the fabric body 21. Also, the explosion-proof valve 1 may have a fabric body attached to a position that affects the rigidity of the membrane part 11 against the push-up force F1, for example, to increase the rigidity of the membrane part 11 against the push-up force F1 or to adjust the rigidity of the membrane part 11 against the push-up force F1. For example, the fabric body may be attached to the end part 11a of the membrane part 11 and the inner surface 14 in the vicinity of the end part 11a.

[0057] 10 to 12, the fabric body 20 may be attached to the membrane part 11 at a portion where the maximum tensile stress occurs, or including the portion where the maximum tensile stress occurs, in the membrane part 11 that closes the open hole 102 even when the pressing force F2 from the outside is applied. However, in this case, the fabric body 20 is not attached to the region R1 that affects the depressurization opening valve of the membrane part 11 by the pushing force F1. Based on the simulation results and the experimental results shown in FIGS. 8 to 12, the fabric bodies 20, 21 may be attached to the membrane part 11 in various forms so as to increase the rigidity of the membrane part 11 against the pressing force F2 from the outside without affecting the depressurization opening valve of the membrane part 11 by the pushing force F1, or while reducing the effect of the pushing force F1 on the depressurization opening valve of the membrane part 11. The fabric bodies 20, 21 may be attached not only to the surface (the outer surface 13 and the inner surface 14) of the membrane part 11, but also embedded inside the membrane part 11.

[0058] Furthermore, the shape of the fabric body 20 does not have to be a shape that covers the entire outer surface 13 of the membrane portion 11 as described above. For example, it may be a shape as shown in Figs. 15 to 18. Figs. 15 to 18 are top views of explosion-proof valves 1 according to modified examples. In Figs. 15 to 18, the pin 30 is omitted, and the valve body 10 is also shown in schematic form.

[0059] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the claims that such modifications or improvements can also be included in the technical scope of the present invention.

[0060] The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. Moreover, the above-described embodiments do not limit the use of the present invention, and the present invention may include anything as its use. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those exemplified, and can be changed as appropriate. For example, the present invention includes differences that occur in the implementation of manufacturing tolerances, etc. Furthermore, the components shown in different embodiments can be partially replaced or combined with each other within a range that is not technically contradictory. Furthermore, each configuration can be appropriately and selectively combined so as to achieve at least a part of the above-described problems and effects. [Explanation of symbols]

[0061] 1 explosion-proof valve (pressure regulating valve), 10 valve body, 11 membrane portion, 11a end portion, 12 sealing surface, 13 outer surface, 14 inner surface, 15 base portion, 16 upper surface, 16a recessed portion, 17 lower surface, 18 side surface, 20, 21 fabric body, 30 pin (fixing member), 100 cell, 101 casing, 102 release hole, 103 locking portion, F1 pushing force, F2 pushing force, R1, R2 area, x-axis line

Claims

1. an umbrella-shaped valve body formed from an elastic material; A fabric body formed from a fabric, The fabric body is attached to the valve body, The fabric body is configured so that the valve body is less likely to be deformed by external forces. Pressure regulating valve.

2. The fabric body is adapted to be tensioned by an externally applied force. The pressure regulating valve according to claim 1 .

3. The fabric body is attached to a portion of the valve body where tensile stress occurs when the valve body is deformed by a force applied from the outside. The pressure regulating valve according to claim 2 .

4. The fabric body is attached to a portion of the valve body where a maximum tensile stress occurs when the valve body is deformed by a force applied from the outside and in the vicinity of the portion of the valve body. The pressure regulating valve according to claim 3.

5. The fabric body is shaped so that it can be tensioned by an external force. The pressure regulating valve according to claim 2 .

6. The fabric body is configured so that the valve body is not easily deformed by a force applied from the inside. The pressure regulating valve according to claim 1 .

7. The fabric body is not attached to a portion of the valve body where tensile stress occurs when the valve body is deformed by a force applied from the inside. The pressure regulating valve according to claim 6.

8. The fabric body is not attached to a portion of the valve body where a maximum tensile stress occurs when the valve body is deformed by a force applied from the inside, and in the vicinity of the portion of the valve body. The pressure regulating valve according to claim 7.

9. The fabric body is attached to a portion of the valve body where compressive stress occurs when the valve body is deformed by a force applied from the inside. The pressure regulating valve according to claim 6.

10. The fabric body is attached to an outwardly facing surface of the valve body. The pressure regulating valve according to claim 1 .

11. The cloth body is attached to a surface of the valve body facing the inside from a middle part of the valve body in a radial direction to an outer circumferential part of the valve body. The pressure regulating valve according to claim 1 or 10.

12. The fabric is formed from fibers. The pressure regulating valve according to claim 1 .

13. The fabric is a base fabric, a woven fabric, or a nonwoven fabric; The pressure regulating valve according to claim 1 .

14. The valve body has a shape that expands in diameter from the outside to the inside along an axis line, and a cross section of the valve body taken along a plane including the axis line follows the outwardly convex arc. The pressure regulating valve according to claim 1 .

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