Pressure relief valve and fluid supply system for a fuel cell equipped therewith

Abstract

The application discloses a pressure relief valve, comprising: a valve body, which defines a hollow inner cavity in the valve body, the inner cavity has two opposite ends, which are communicated with high-pressure side and low-pressure side of the pressure relief valve respectively; a partition plate arranged in the valve body and located in the hollow inner cavity; a through member arranged in the valve body and capable of linear sliding, the through member is applied with a force along from the low-pressure side to the high-pressure side by an elastic component located in the inner cavity; and a locking device fixedly arranged in the valve body and separated from the partition plate, by means of the locking device, the through member is locked in a cut-off state of the pressure relief valve, in the cut-off state, the high-pressure side and the low-pressure side are sealedly separated by the partition plate, the through member is configured to be unable to lock the through member when a specified temperature is exceeded, finally the pressure relief valve is in a conducting state, in the conducting state, the partition plate is penetrated by the through member so that the high-pressure side and the low-pressure side are conducted. The application also designs a fluid supply system adopting the pressure relief valve.

Description

TECHNICAL FIELD

[0001] The present application relates to a pressure relief valve, in particular a temperature-triggered pressure relief valve. BACKGROUND

[0002] In view of environmental protection (e.g. preventing global warming, preventing air pollution, energy saving and emission reduction, etc.), new energy vehicles are increasingly valued and developed by manufacturers. Fuel cells as power supply devices for new energy vehicles are increasingly concerned by researchers and the market.

[0003] Fuel cells need to supply gases such as high-pressure hydrogen or high-pressure air into the stack for corresponding reactions to generate electricity for driving the vehicle. Generally, these high-pressure gases are stored in high-pressure tanks of the fuel cell and supplied into the stack through a supply system as needed. Taking hydrogen as an example, it is usually stored in a high-pressure tank at a gas pressure of 350 bar or more. The supply system includes high-pressure pipelines and low-pressure pipelines, and the high-pressure tanks are connected in series in the high-pressure pipelines. In order to ensure that the vehicle will not explode due to excessive increase in gas pressure in the high-pressure tank caused by high temperature in the event of an accident, such as a vehicle fire, a pressure relief valve needs to be provided for the high-pressure tank or the high-pressure pipelines of the supply system. SUMMARY

[0004] The present application aims to provide a temperature-triggered pressure relief valve to ensure that the high-pressure tank or the high-pressure pipeline can automatically relieve pressure when the temperature exceeds a certain temperature.

[0005] According to an aspect of the present application, a pressure relief valve is provided, comprising:

[0006] a valve body defining a hollow inner cavity therein, the hollow inner cavity having opposite two ends communicating with a high-pressure side and a low-pressure side of the pressure relief valve, respectively; and

[0007] a partition plate arranged in the valve body, the partition plate being located in the hollow inner cavity;

[0008] a through member linearly slidably arranged in the valve body, the through member being subjected to a force along from the low-pressure side towards the high-pressure side by an elastic member located in the inner cavity; and

[0009] In the valve body, a locking device is fixedly arranged separately from the partition, by means of which the through member is locked in a closed state of the pressure relief valve, in which state the high-pressure side and the low-pressure side are sealingly separated by the partition, and the through member is configured so as not to be locked when a predetermined temperature is exceeded, so that the through member is moved from the low-pressure side toward the high-pressure side under the force, and finally the pressure relief valve is in an open state, in which state the partition is penetrated by the through member so that the high-pressure side and the low-pressure side are open. In this way, since the locking device is triggered based on temperature, reliable protection can be provided when an unexpectedly high temperature occurs. In addition, because the locking device is arranged separately from the partition, it can be ensured that there is no problem of accidental leakage due to failure of the locking device.

[0010] Optionally, the locking device includes a locking pin that passes through a through hole formed in the valve body and at least partially extends into the through member to lock the through member in the closed state.

[0011] Optionally, the locking pin is made of a fusible alloy, so that the predetermined temperature is in the range of 110°C ± 5°C.

[0012] Optionally, the through member is integrally formed.

[0013] Optionally, the through member includes a spring seat and a piercing member for penetrating the partition mounted on the spring seat, and the force is applied to the spring seat. Because the through member is designed in parts, the expensive material cost for manufacturing the piercing member can be saved.

[0014] Optionally, the elastic member includes a coil spring that is sleeved on at least part of the outer surface of the spring seat, and one end of the coil spring abuts against a portion of the valve body and the opposite end of the coil spring abuts against a portion of the spring seat.

[0015] Optionally, the partition is designed such that a portion thereof in the hollow inner cavity is convex toward the high-pressure side, and the portion is shaped in the form of a portion of a spherical surface. In this way, under the premise that the thickness of the partition is constant, the partition can be made to withstand greater fluid pressure.

[0016] Optionally, the spring seat is formed with a first hollow inner cavity axially penetrating therethrough, the piercing member is formed with a second hollow inner cavity axially penetrating therethrough, and the inner cavity of the valve body communicates with the first inner cavity and the second inner cavity.

[0017] Optionally, the puncture member has a tip formed by a bevel, so that in the punctured state of the pressure relief valve, the tip penetrates the septum and brings the second inner cavity into communication with the high pressure side, so that pressure relief can be achieved rapidly when the septum is punctured.

[0018] Optionally, the septum is sealingly separated from the high pressure side and the low pressure side by means of a sealing ring provided in the inner cavity of the valve body, the sealing ring being separated from the puncture member and the locking device at least in the axial direction.

[0019] According to another aspect of the present application, there is also provided a fluid supply system for use in a fuel cell vehicle, comprising:

[0020] a high pressure fluid tank; and

[0021] a high pressure line in fluid communication with the high pressure fluid tank, wherein a pressure relief valve according to the foregoing is provided in the high pressure fluid tank and / or the high pressure line, so that the high pressure side of the pressure relief valve is in communication with the high pressure fluid in the high pressure fluid tank and / or the high pressure line, and the low pressure side of the pressure relief valve is in communication with the atmosphere.

[0022] With the above technical means of the present application, it can be ensured that in the case of abnormally high temperature, the high pressure tank or high pressure line can be rapidly and reliably pressure relieved, and the pressure bearing capacity of the pressure relief valve in normal conditions is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] The principles and various aspects of the present application can be better understood with the following detailed description when considered in connection with the accompanying drawings, in which:

[0024] Figure 1 a simplified diagram of a fluid supply system equipped with a pressure relief valve according to the present application is schematically shown;

[0025] Figure 2 a pressure relief valve structure according to one embodiment of the present application is schematically shown, wherein the pressure relief valve is in a cut-off state; and

[0026] Figure 3 a pressure relief valve structure according to an embodiment of the present application is schematically shown, wherein the pressure relief valve is in a pressure relief state. DETAILED DESCRIPTION

[0027] In the drawings of the present application, features with the same structure or function are denoted by the same reference numerals. Furthermore, in the drawings of the present application, the section lines of the same components can be presented in different ways in different views, but this should not be considered to have any impact on the understanding of the technical solution of the present application. For example, in the drawings of the present application, the section lines of the same components can be presented in different ways in different views, but this should not be considered to have any impact on the understanding of the technical solution of the present application. For example, in the drawings of the present application, the section lines of the same components can be presented in different ways in different views, but this should not be considered to have any impact on the understanding of the technical solution of the present application.Figure 2 and 3 In the drawings, the cross-hatching lines of the same parts can have different densities and directions for drawing reasons, but this does not affect the understanding of the technical solutions of the present application.

[0028] Figure 1 A part of a fluid supply system 1 that can be used in a fuel cell vehicle is schematically shown. For example, the fluid supply system 1 can supply a gas such as high-pressure hydrogen or high-pressure air to an electric stack of a fuel cell of the vehicle, or can supply a liquid such as water for normal operation of the fuel cell. In the present application, the gas and the liquid are collectively referred to as a fluid. The fluid supply system 1 includes a high-pressure fluid tank 20 in which a high-pressure fluid is stored.

[0029] Hereinafter, the fluid supply system 1 will be described by way of example using hydrogen. However, it will be apparent to those skilled in the art that any other suitable high-pressure fluid for ensuring normal operation of a fuel cell can also be applied to the technical content described below in relation to the description of hydrogen.

[0030] The high-pressure fluid tank 20 can be a hydrogen tank. The high-pressure fluid tank 20 is sealingly connected to a high-pressure line 10a of the fluid supply system 1, wherein the high-pressure line 10a is fluidly connected to a low-pressure line 10b of the fluid supply system 1 via a pressure regulating valve 40. The fluid supply system 1 further includes a supply nozzle 30 provided in the low-pressure line 10b. In this way, high-pressure hydrogen is stored in the high-pressure fluid tank 20 in advance, and the high-pressure hydrogen is output from the high-pressure fluid tank 20 via the high-pressure line 10a as required, and is depressurized via the pressure regulating valve 40 to enter the low-pressure line 10b, and is further supplied to the electric stack of the fuel cell via the supply nozzle 30 in order to achieve an electrochemical reaction and generate electric power.

[0031] In the event of an accident such as a collision of the vehicle, the fluid supply system 1 can be damaged, and the high-pressure fluid tank 20 can be subjected to an abnormally high temperature, resulting in an abnormally high pressure of the fluid in the high-pressure fluid tank 20 and further causing an explosion. In order to avoid the possibility of an explosion of the high-pressure fluid tank 20 due to such an accident, a pressure relief valve according to the present application can be provided in the high-pressure fluid tank 20 and / or in the high-pressure line 10a. For example, as indicated by an arrow 100, such a pressure relief valve can be provided at an outlet of the high-pressure fluid tank 20, for example, in parallel with an output valve (not shown) at the outlet; and / or, such a pressure relief valve can be provided in a wall of the high-pressure fluid tank 20.

[0032] Next, with reference to the drawings, a pressure relief valve according to the present application will be described. Figure 2 and 3An example of a pressure relief valve 100 is illustrated. As shown, the pressure relief valve 100 includes a generally cylindrical valve body member 101. A hollow interior cavity 200 is defined by the interior wall of the valve body member 101. The interior cavity 200 has two openings opposite to each other, one on the left side of the figure and the other on the right side of the figure, which are in communication with the high pressure side and the low pressure side of the pressure relief valve 100, respectively. In Figure 1 and 2 the left side is considered as the high pressure side of the pressure relief valve 100, which is in communication with the outlet of the high pressure fluid tank 20 or the high pressure line 10a, for example; and the right side is considered as the low pressure side of the pressure relief valve 100, which is in communication with the ambient atmosphere or other low pressure fluid lines, for example.

[0033] From the high pressure side of the valve body member 101, a base member 102 is mounted to the valve body member 101 and partially exposed. For example, the outer peripheral surface of the base member 102 is formed with threads, and the corresponding inner peripheral surface of the valve body member 101 is also formed with threads, so that the two are screwed together. The base member 102 is also formed with a hollow interior cavity 203. When the base member 102 is mounted in place in the valve body member 101, the interior cavity 203 can be in communication with the interior cavity 200. In this case, the opening of the interior cavity 203 (e.g. the left opening in Figure 2 ) in communication with the interior cavity 200 is in communication with the high pressure side of the pressure relief valve 100.

[0034] The outer wall of the base member 102 is formed with a large diameter section 102a and a small diameter section 102b, wherein the outer diameter of the large diameter section 102a can be substantially the same as the outer diameter of the valve body member 101, and the small diameter section 102b is formed with external threads to engage with the internal threads formed on the inner wall of the valve body member 101. The base member 102 and the valve body member 101 constitute the valve body of the pressure relief valve 100 when assembled in place.

[0035] In the interior cavity 203 of the base member 102, a step surface 102c is formed by the inner wall of the base member 102, which is an annular surface perpendicular to the longitudinal axis of the valve body. The step surface 102c is located substantially in the region of the large diameter section 102a of the base member 102 along the longitudinal axis direction. An annular groove 102d is also formed around the step surface 102c for mounting a sealing ring 108 therein. An inner sleeve 106 is mounted in the base member 102. The outer wall of the inner sleeve 106 is formed with external threads to engage with the internal threads formed on the inner wall of the base member 102. The inner sleeve 106 is also generally cylindrical, having two end faces opposite to each other. The inner sleeve 106 has a hollow interior cavity 204 defined by its inner wall.

[0036] Further, a spacer 107 is sandwiched between the base member 102 and the inner sleeve 106. The spacer 107 is configured to sealably separate the high pressure side and the low pressure side of the pressure relief valve 100 under the tightening force between the base member 102 and the inner sleeve 106. For example, during assembly, a seal ring 108 can be first placed into the annular groove 102d of the base member 102, and the thickness of the seal ring 108 can be configured to be slightly larger than the axial depth of the annular groove 102d, so that when the spacer 107 is installed towards the step surface 102c of the base member 102, it will first contact the seal ring 108. Then, the inner sleeve 106 is screwed into the base member 102 from the side of the end surface 102e of the base member 102, and finally one end surface of the inner sleeve 106 is pressed against the spacer 107 and further presses the seal ring 108. When the inner sleeve 106 is finally screwed into place in the base member 102, the end surface 106a of the inner sleeve 106 opposite to the end surface of the inner sleeve 106 in contact with the spacer 107 can be flush with the end surface 102e of the base member 102. The cooperation of the seal ring 108 and the spacer 107 ensures the air-tight separation between the inner cavities on the opposite sides of the spacer 107, i.e. the inner cavity 203 portion on the side of the spacer 107 adjacent to the high pressure side of the pressure relief valve 100 (left side in Figure 1 and 2 ) and the inner cavity 204 of the inner sleeve 106 on the side of the spacer 107 adjacent to the low pressure side of the pressure relief valve 100 (right side in Figure 1 and 2 ).

[0037] The inner cavity 200 of the valve body member 101 includes a large diameter inner cavity section 200a and a small diameter inner cavity section 200b defined by the inner wall of the valve body member 101, wherein the large diameter inner cavity section 200a and the small diameter inner cavity section 200b are in communication with the inner cavity 204 of the inner sleeve 106 after the valve body member 101 is assembled in place. The large diameter inner cavity section 200a is connected to the small diameter inner cavity section 200b at the step surface 101a formed by the inner wall of the valve body member 101. Further, the spring seat 103 is slidably located in the inner cavity 200 of the valve body member 101. The spring seat 103 is also a hollow structure, and the inner wall thereof defines a hollow inner cavity 201 of the spring seat 103. From the outside, the spring seat 103 also includes a large diameter section 103a and a small diameter section 103b, wherein the large diameter section 103a further includes an annular flange 103c.

[0038] The large-diameter section 103a of the spring seat 103 can be slidably supported by the inner wall of the valve body part 101 in the large-diameter inner cavity section 200a of the valve body part 101 with the aid of the annular flange 103c, and the small-diameter section 103b of the spring seat 103 can be slidably supported by the inner wall of the valve body part 101 in the small-diameter inner cavity section 200b of the valve body part 101. The outer diameter of the large-diameter section 103a of the spring seat 103 is smaller than the diameter of the large-diameter inner cavity section 200a of the valve body part 101, so that a coil spring 104 can be arranged between the outer diameter of the spring seat 103, in particular of its large-diameter section 103a, and the inner wall of the valve body part 101. One end of the coil spring 104 can abut against the step face 101a of the valve body part 101, and the opposite other end can abut against the annular flange 103c of the spring seat 103.

[0039] Further, a piercing part 105 is fixed on the end face of the annular flange 103c opposite the coil spring 104. The piercing part 105 comprises a base 105a and a sharp part 105b which is formed integrally with the base 105a and extends axially from the base 105a. The piercing part 105 is also of hollow construction and defines a hollow inner cavity 202 which extends axially through the base 105a and the sharp part 105b. A through hole can be formed in the base 105a in order to fix the base 105a to the annular flange 103c via a screw, as shown in Figure 2 and 3 The sharp part 105b has a tip formed by a bevel for piercing the septum 107.

[0040] Figure 2 The pressure relief valve 100 is shown schematically in cross-sectional view in a closed state in which the septum 107 remains intact, so that the high-pressure side and the low-pressure side of the pressure relief valve 100 are isolated from one another. Figure 3 The pressure relief valve 100 is shown schematically in cross-sectional view in a pressure relief state in which the septum 107 is pierced by the sharp part 105b, so that the high-pressure side and the low-pressure side of the pressure relief valve 100 are connected.

[0041] In the region of the small-diameter inner cavity section 200b of the inner cavity 200 of the valve body part 101, a radial through hole is formed in the wall of the valve body part 101, into which a plug 109 can be inserted. The plug 109 is formed with a blind hole 119 into which, for example, a locking pin 120 can be inserted in a form-fit or friction-fit manner, so that it is partially exposed from the blind hole 119. As shown in Figure 2In the shown closed state, the plug 109 is inserted into the through hole in the side wall of the valve body part 101 and the exposed part of the locking pin 120 is inserted into the radial through hole 113 in the small diameter section 103b of the spring seat 103, thereby axially locking the spring seat 103 and in turn the piercing part 105 in place.

[0042] The sharp part 105b of the piercing part 105 has an outer diameter which is smaller than the diameter of the hollow inner cavity 204 of the inner sleeve 106, so that the sharp part 105b can extend into the inner cavity 204. However, in the shown closed state, the tip of the sharp part 105b is spaced apart from the spacer 107, while the base 105a is also spaced apart from the end face 102e of the base part 102 and / or the end face 106a of the inner sleeve 106. Figure 2

[0043] For example, when assembling the pressure relief valve 100, the coil spring 104 can first be placed into the large diameter inner cavity section 200a of the valve body part 101 so that one end thereof is in contact with the step face 101a, and then the spring seat 103, which has the piercing part 105 fixed thereto, is placed into the large diameter inner cavity section 200a so that the annular flange 103c of the spring seat 103 is in contact with the opposite other end of the coil spring 104. Subsequently, the spring seat 103 is pressed using a special tool so that the small diameter section 103b thereof axially slides in the small diameter inner cavity section 200b of the valve body part 101 and finally the step face between the large diameter section 103a and the small diameter section 103b of the spring seat 103 is in contact with the step face 101a of the valve body part 101, at which time the radial through hole 113 of the spring seat 103 is coaxial with the through hole in the valve body part 101 for inserting the plug 109. Thereafter, the plug 109 can be inserted into the through hole in the valve body part 101 to axially lock the spring seat 103 and the piercing part 105 in place in the valve body part 101. Subsequently, the base part 102, which has the spacer 107 and the inner sleeve 106 assembled thereto, is screwed from the high pressure side into the valve body part 101 so that the sharp part 105b of the piercing part 105 enters the hollow inner cavity 204 of the inner sleeve 106 and the tip of the sharp part 105b is spaced apart from the spacer 107, while the base 105a is also spaced apart from the end face 106a of the inner sleeve 106 and / or the end face 102e of the base part 102.

[0044] The axial length of the piercing part 105 can be set so that, when the pressure relief valve 100 is assembled in place, the tip of the sharp part 105b is spaced apart from the spacer 107 by a distance of about 0.1 mm to about 0.5 mm, preferably about 0.2 mm to about 0.3 mm. Figure 2 ​In the cut-off state shown, the tip of the sharp part 105b just does not contact the diaphragm 107, thereby ensuring that as long as the piercing member 105 is moved toward the diaphragm 107, the tip of the sharp part 105b will be able to reach the diaphragm 107. In addition, the coil spring 104 is configured to always apply a force to the spring seat 103 that tends to move it from the low-pressure side to the high-pressure side of the pressure relief valve 100.

[0045] In embodiments of this application, the locking pin 120 can be made of a fusible material, such as a fusible alloy. For example, this fusible alloy can be selected from any suitable fusible alloy currently available on the market, as long as its strength can suddenly decrease within a specific temperature range, so that the locking pin 120 cannot support the force of the coil spring 104 to maintain the pressure relief valve 100 in the closed state. Taking hydrogen as an example, the fusible alloy used to manufacture the locking pin 120 can be selected with a melting point in the range of 110°C ± 5°C. The dimensions of the locking pin 120 are designed such that below this range, the locking pin 120 can support the force of the coil spring 104 to maintain the pressure relief valve 100 in the closed state. Figure 2 The cutoff state is shown.

[0046] During the use of the pressure relief valve 100, the pressure relief valve 100 functions as follows: Figure 2 The shut-off state shown is, for example, at the outlet of a high-pressure fluid tank 20, such that the high-pressure side of the pressure relief valve 100 is in communication with the high-pressure fluid, while the low-pressure side of the pressure relief valve 100 is in communication with the atmosphere or other low-pressure pipelines. During normal use, the locking pin 120 locks the spring seat 103 in place, thus the partition 107 isolates the high-pressure side from the low-pressure side. When the ambient temperature of the pressure relief valve 100 reaches or exceeds a certain value within the range of 110°C ± 5°C, the state of the locking pin 120 changes so that its strength is insufficient to support the force of the helical spring 104. For example, if the locking pin 120 breaks or is severed, under the force of the coil spring 104, the spring seat 103 carrying the piercing member 105 is rapidly driven towards the high-pressure side, causing the sharp part 105b of the piercing member 105 to pierce the diaphragm 107. Ultimately, the piercing member 105 will stop due to the contact between the base 105a and the end plane 106a and / or the end face 102e of the base member 102, thus placing the pressure relief valve 100 in a position similar to... Figure 3The pressure relief state is shown. In the pressure relief state, the inner cavities 203, 204, 202, 203 and 202 are all communicated with each other, that is, the high pressure side and the low pressure side of the pressure relief valve 100 are communicated, so that the high pressure fluid can be quickly emptied from the high pressure fluid tank 20, avoiding accidents. In the technical solution of the present application, because the locking pin 120 constituting the locking device of the pressure relief valve is configured to fail only at a specific temperature or temperature range, and the locking pin 120 is designed to be separated from the sealing ring 108 constituting the sealing structure of the pressure relief valve, the locking device of the pressure relief valve 100 does not affect the reliability of the sealing structure. That is, the situation that the high pressure fluid in the container such as the high pressure fluid tank 20 on the high pressure side slowly leaks due to the aging of the locking device does not occur because the locking device is integrated with the sealing structure. In addition, the temperature-activated locking device ensures that the pressure relief valve 100 can be quickly opened in the case of abnormally high temperature.

[0047] As shown in Figure 2 and 3 In the embodiment of the present application, the spacer 107 is designed such that the part of the spacer 107 inside the hollow inner cavity 203 of the base member 102 is convex toward the high pressure side and is shaped in the form of a part of a spherical surface. In the present application, the term "the spacer is convex toward the high pressure side and is shaped in the form of a part of a spherical surface" means that the center of the sphere is close to the low pressure side opposite to the high pressure side. Such a design makes the pressure from the high pressure fluid opposite to the convex direction of the spacer 107, thereby ensuring that, with the same thickness of the spacer 107, the spacer 107 of the present application can withstand greater fluid pressure compared to a relatively flat spacer.

[0048] In addition, in the embodiment of the present application, the piercing member 105 and the spring seat 103 are assembled together to constitute a penetrating member capable of linear sliding in the valve body, wherein the spring seat 103 is made of common mechanical manufacturing steel or light aluminum alloy at a relatively low price without special heat treatment, but the piercing member 105 is made of a special high-hardness material at a relatively high price and is subjected to special heat treatment, so that the pressure relief valve according to the present application can be manufactured at a reasonable cost and with a lighter weight. It should be clear to those skilled in the art that the piercing member 105 and the spring seat 103 can also be integrally made of a special high-hardness material at a relatively high price and subjected to special heat treatment in an alternative embodiment of the penetrating member.

[0049] Although the penetrating member applies the force from the low pressure side toward the high pressure side via the coil spring 104 in the embodiment of the present application, the coil spring 104 can also be replaced by other elastic members having the same function in alternative embodiments. For example, in one alternative embodiment, such an elastic member can also be a hollow elastic bellows structure arranged in the inner cavity of the valve body, which is sleeved on a portion of the penetrating member, thereby applying the force acting from the low pressure side toward the high pressure side to the penetrating member relative to the valve body.

[0050] In the embodiment shown in the drawings, the locking pin 120 constitutes a locking device according to the present application, which is used to lock the piercing member 105 and / or the spring seat 103 as a part of the penetrating member in the off state of the pressure relief valve 100. However, it should be clear to those skilled in the art that the locking device is not limited to the example shown. For example, the number of the locking pin 120 can be one or more. For another example, in an alternative embodiment, the locking device can include other structures made of a fusible alloy, which acts between the valve body and the spring seat 103 to lock the spring seat 103 relative to the valve body.

[0051] Although the specific embodiments of the present application are described in detail herein, they are given for the purpose of explanation only and should not be considered as limiting the scope of the present application. In addition, it should be clear to those skilled in the art that the embodiments described in the specification can be used in combination with each other. Various alternatives, modifications and improvements can be conceived without departing from the spirit and scope of the present application.

Claims

1. A pressure relief valve (100) comprising: a valve body defining a hollow inner cavity therein, said hollow inner cavity having opposite ends communicating with a high pressure side and a low pressure side of said pressure relief valve (100), respectively; and a partition (107) provided in said valve body, said partition (107) being located in said hollow inner cavity; a through member linearly slidably provided in said valve body, said through member being subjected to a force along from said low pressure side toward said high pressure side by an elastic member located in said inner cavity; and a locking device fixedly provided in said valve body apart from said partition (107), by means of which said through member is locked in a cutoff state of said pressure relief valve, said locking device comprising a plug member provided in a through hole of said valve body, said plug member being inserted in a radial through hole formed in a wall of said valve body, said plug member being formed with a blind hole extending radially into said plug member; and said locking device further comprising a locking pin provided in said blind hole of said plug member to at least partially extend into said through member so as to lock said through member in said cutoff state, in said cutoff state, said high pressure side and said low pressure side are sealingly isolated by said partition, and said through member is configured to be unable to be locked when a prescribed temperature is exceeded, so that said through member is moved from said low pressure side toward said high pressure side under the action of said force, and finally said pressure relief valve is in a conductive state in which said partition is penetrated by said through member so that said high pressure side and said low pressure side are conductive. Said locking pin (120) is made of a fusible alloy, so that said prescribed temperature is in the range of 110°C ± 5°C.

2. The pressure relief valve (100) according to claim 1, characterized in that Said through member is integrally formed.

3. The pressure relief valve (100) according to any one of claims 1 to 2, characterized in that Said through member comprises a spring seat (103) and a piercing member (105) mounted on said spring seat (103) for penetrating said partition (107), said force being applied to said spring seat (103).

4. The pressure relief valve (100) according to any one of claims 1 to 2, characterized in that Said elastic member comprises a coil spring (104) sleeved on at least a part of an outer surface of said spring seat (103), and one end of said coil spring (104) abuts against a part of said valve body and the opposite end of said coil spring abuts against a part of said spring seat (103).

5. The pressure relief valve (100) according to claim 4, characterized in that Said partition (107) is designed such that a portion thereof in said hollow inner cavity is convex toward said high pressure side, and said portion of said partition (107) is shaped in the manner of forming a portion of a spherical surface.

6. The pressure relief valve (100) according to any one of claims 1 to 2, characterized in that Said spring seat (103) is formed with a first hollow inner cavity (201) axially penetrating therethrough, said piercing member (105) is formed with a second hollow inner cavity (202) axially penetrating therethrough, and said inner cavity of said valve body communicates with said first inner cavity (201) and said second inner cavity (202) with each other.

7. The pressure relief valve (100) of claim 5, wherein, ​ 8. The pressure relief valve (100) according to claim 7, characterized in that The puncture member (105) has a tip formed by a bevel so as to penetrate the diaphragm (107) and communicate the second inner chamber (202) with the high pressure side in the passage state of the pressure relief valve (100).

9. The pressure relief valve (100) according to claim 8, characterized in that The diaphragm (107) hermetically separates the high pressure side and the low pressure side via a seal ring (108) provided in the inner chamber of the valve body, the seal ring (108) being spaced apart from the locking device at least along the axial direction through the puncture member (105).

10. A fluid supply system (1) for use in a fuel cell vehicle, comprising: a high pressure fluid tank (20); and a high pressure line in fluid communication with the high pressure fluid tank (20), wherein a pressure relief valve (100) according to any of the preceding claims is provided in the high pressure fluid tank (20) and / or in the high pressure line so that the high pressure side of the pressure relief valve (100) is in communication with the high pressure fluid in the high pressure fluid tank (20) and / or in the high pressure line, while the low pressure side of the pressure relief valve (100) is in communication with the atmosphere.

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