CN219017849U

CN219017849U - Explosion-proof valve, end cover assembly, energy storage device and electric equipment

Info

Publication number: CN219017849U
Application number: CN202223253026.6U
Authority: CN
Inventors: 胡岳霖
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-05-12
Anticipated expiration: 2032-12-05

Abstract

The application discloses explosion-proof valve, end cover subassembly, energy memory and consumer, explosion-proof valve includes the shell, the valve gap, valve body and elastic component, the explosion-proof hole of shell includes first hole section and radial dimension is greater than the second hole section of first hole section, the valve gap covers in the second hole section, the valve body sets up in the second hole section, the one end of valve body is located first hole section in order to seal in first hole section, the valve body can be followed the relative second hole section activity of the axis direction of explosion-proof hole and to seal in first hole section or open first hole section, have the clearance between the pore wall face of outer peripheral face of valve body and second hole section, in order to when the valve body activity to communicate first hole section, first hole section is directly or indirectly through the clearance intercommunication, the elastic component is connected between valve body and valve gap, in order to provide the driving force to the valve body along the direction towards the valve body. By adopting the scheme, the microcrack risk caused by the breathing effect of charge-discharge expansion of the explosion-proof valve in the use process can be weakened or eliminated, and the safety of the energy storage device is improved.

Description

Explosion-proof valve, end cover assembly, energy storage device and electric equipment

Technical Field

The utility model relates to the technical field of energy storage, in particular to an explosion-proof valve, an end cover assembly, an energy storage device and electric equipment.

Background

In the related art, in order to ensure the safety of a battery, an explosion-proof valve is generally provided at an end cap of the battery, and when the battery is thermally out of control, for example, when the battery is improperly charged, shorted or abused, a large amount of gas is generated from the battery and the temperature is also sharply increased, and the gas in the battery may blow up the explosion-proof valve to release the pressure, so that the safety of the battery is ensured.

At present, most explosion-proof valves generally adopt a metal sheet as a valve body, and a weak structure (explosion-proof scratch) is manufactured on the valve body in a stamping mode and the like, so that when the air pressure in the battery reaches the pressure relief threshold of the explosion-proof valve, the gas in the battery can conveniently rush to open the explosion-proof valve for pressure relief. However, when the air pressure in the battery is high, the expansion caused by charge and discharge brings about a respiratory effect of the internal air pressure, namely, the circulation increase and decrease of the air pressure in the battery occur. The breathing effect can lead to micro-bulge and shrinkage of the explosion-proof valve, and continuously accumulated stress is caused to the explosion-proof notch, so that the explosion-proof valve is cracked when the air pressure in the battery does not reach the pressure release threshold value, the airtight function of the explosion-proof valve is damaged, and the battery is further caused to have the risks of cell performance reduction and safety failure.

Disclosure of Invention

The embodiment of the utility model discloses an explosion-proof valve, an end cover assembly, an energy storage device and electric equipment, which can weaken or eliminate the risk of microcracks caused by the breathing effect of charge and discharge expansion of the explosion-proof valve in the use process, and improve the safety of the energy storage device.

To achieve the above object, in a first aspect, the present utility model discloses an explosion-proof valve comprising:

the shell is provided with a through explosion-proof hole, the explosion-proof hole comprises a first hole section and a second hole section which are communicated with each other, and the radial size of the first hole section is smaller than that of the second hole section;

the valve cover covers the opening of the second hole section and is provided with a first ventilation hole communicated with the second hole section; and

the valve body is arranged in the second hole section, one end of the valve body, which is opposite to the valve cover, is positioned in the first hole section so as to be sealed in the first hole section, the valve body can move relative to the second hole section along the axis direction of the explosion-proof hole to be sealed in the first hole section or open the first hole section, a gap which is directly or indirectly communicated with the first air vent is formed between the outer peripheral surface of the valve body and the hole wall surface of the second hole section, and when the valve body moves relative to the second hole section along the axis direction of the explosion-proof hole to open the first hole section, the first hole section is directly or indirectly communicated with the first air vent through the gap; and

And an elastic member connected between the valve body and the valve cover, the elastic member being for providing an urging force to the valve body in a first direction configured as a direction toward the valve body among axial directions of the explosion proof holes.

In the explosion-proof valve that this application provided, through utilizing the opening of this valve gap cover second hole section, and be provided with the first bleeder vent that communicates in the second hole section at the valve gap, make the valve body can move to sealing in first hole section or open first hole section along the relative second hole section of explosion-proof hole's axis direction simultaneously, like this when this explosion-proof valve is applied to energy storage device, and when the atmospheric pressure in the energy storage device is less than preset pressure release threshold value, the valve body butt seals on first hole section, and when the atmospheric pressure in the energy storage device is higher than preset pressure release threshold value, the gas in the energy storage device promotes the valve body activity, open first hole section and compress the elastic component, with make first hole section through the clearance between the outer peripheral surface of valve body and the pore wall of second hole section direct or indirect and first bleeder vent intercommunication, let the gas in the energy storage device can be through first hole section, clearance and first hole section release to the energy storage device outward, thereby reach the purpose that prevents the pressure release, and after the pressure release is accomplished, the valve body can be in the promotion effect of elastic component resumes deformation and is carried out on first hole section again, explosion-proof cost is realized, the safety is reduced. Therefore, the explosion-proof valve does not need to be provided with explosion-proof scratches, so that the explosion-proof valve can weaken or eliminate the risk of microcracks caused by the breathing effect of charge and discharge expansion in the use process of the explosion-proof valve, and the safety of the energy storage device is improved; and meanwhile, the explosion-proof valve can be prevented from being completely flushed away when being opened, and a plurality of fragments separated from the top cover of the energy storage device are formed, so that other parts can be protected from being damaged by the explosion of the explosion-proof valve, and the safety of the energy storage device is improved.

In addition, when the valve body is pushed by gas in the energy storage device to move towards the valve cover, the valve cover covers the opening of the second hole section, so that the valve body can be prevented from splashing out of the second hole section to damage other parts, and the use safety of the energy storage device is further improved.

As an alternative implementation manner, in an embodiment of the first aspect of the present utility model, the second hole section includes a first sub-hole section and a second sub-hole section that are mutually communicated, a radial dimension of the first sub-hole section is greater than a radial dimension of the second sub-hole section and is greater than a radial dimension of the first hole section, the valve cover covers an opening of the second sub-hole section, the valve body is disposed in the first sub-hole section, and the gap is formed between an outer peripheral surface of the valve body and a hole wall surface of the first sub-hole section, and the other end of the valve body facing the valve cover extends into the second sub-hole section to be attached to the hole wall surface of the second sub-hole section; when the valve body moves along the axis direction of the explosion-proof hole, the peripheral side surface of the valve body can move along the hole wall surface of the second sub-hole section, so that the second sub-hole section can be utilized to guide the movement of the valve body, the valve body can move more smoothly, and the valve body can quickly and timely open the first hole section to perform explosion-proof pressure relief when the air pressure in the energy storage device reaches a preset pressure relief threshold value.

The surface of the valve body facing one side of the valve cover is recessed in the valve body to form a groove, the groove is communicated with the first air hole, the valve body is provided with a second air hole, the second air hole penetrates through the side wall of the groove, so that the groove is communicated with the gap, the gap is communicated with the first air hole through the second air hole and the groove, when the valve body moves to open the first hole section along the axis direction of the explosion-proof hole relative to the second hole section, the first hole section sequentially passes through the gap, the second air hole and the groove to be communicated with the first air hole, and therefore gas in the energy storage device can be released to the outside of the energy storage device through the first hole section, the gap, the second air hole, the groove and the first air hole, and the purpose of pressure release and explosion prevention can be achieved.

As an alternative embodiment, in an embodiment of the first aspect of the present utility model, the valve cover is movable relative to the second hole section in the axial direction of the explosion proof hole and compresses the elastic member to provide a pressing force against the valve body in the first direction. The valve cover can move along the axis direction of the explosion-proof hole relative to the second hole section, so that the position of the valve cover at the second hole section can be regulated and controlled, the compression amount of the elastic piece can be regulated and controlled, the compression force acting on the valve body can be regulated and controlled, and the compression amount of one end of the valve body, which is opposite to the valve cover, to the first hole section can be regulated and controlled, so that the effective sealing of the first hole section can be realized, and the sealing effect of the valve body can be effectively improved.

In an embodiment of the first aspect of the present utility model, the end surface of the housing is recessed in the housing to form a sink, the sink is connected to the second hole section, the valve cover is disposed in the sink to cover the opening of the second hole section, an external thread is disposed on the outer peripheral surface of the valve cover, an internal thread is disposed on a position of the wall surface of the sink corresponding to the external thread, the external thread is cooperatively connected with the internal thread, so that when the valve cover is rotated, the valve cover can move relative to the second hole section along an axial direction of the explosion-proof hole, and when the valve cover stops rotating, the valve cover can be kept at a current position.

Or, the pore wall surface of the second pore section is provided with a plurality of annular grooves, the annular grooves are arranged at intervals along the axial direction of the explosion-proof pore, the explosion-proof valve further comprises a piston ring, the piston ring is abutted to the valve cover, and the piston ring is detachably connected to any annular groove so as to change the position of the valve cover in the second pore section, so that the compression amount of the elastic piece can be regulated and controlled, and the compression amount of the valve body can be controlled, so that the valve body is not limited to be jacked for explosion-proof pressure relief only when the air pressure of the energy storage device reaches a specific preset pressure relief threshold, and the explosion-proof valve can be suitable for the energy storage devices with different preset pressure relief thresholds and has higher applicability.

As an alternative implementation manner, in an embodiment of the first aspect of the present utility model, a surface of the valve cover facing to one side of the valve body is provided with a first limiting portion, the first limiting portion is connected to the elastic member, and the first limiting portion is used for limiting the coaxial arrangement of a center line of the elastic member and a center line of the valve cover so as to prevent the elastic member from running, so that on one hand, the elastic member is easy to deform along an axis direction of the explosion-proof hole when the elastic member is subjected to the acting force of the valve body, and on the other hand, when the valve body moves towards the valve cover, the valve body can be subjected to smaller resistance from the elastic member so as to open the first hole section; on the other hand, the elastic piece is easy to deform along the axial direction of the explosion-proof hole when the elastic piece receives the acting force of the valve cover, so that the elastic piece can provide uniform pushing force along the first direction, the valve body is uniformly abutted against the first hole section, and the sealing performance is improved; simultaneously, when the valve cover is screwed into the sinking groove, the valve cover is enabled to be less in resistance from the elastic piece, and then the valve cover is conveniently screwed into the sinking groove.

In addition, this first spacing portion also can be used for guiding to a certain extent the elastic component takes place deformation or resumes deformation along the axis direction of explosion-proof hole to the elastic component can utilize this first spacing portion to play the effect of direction when compressed or resume deformation, so that the elastic component can take place deformation smoothly when compressed, and can resume deformation smoothly when the effort that receives reduces or disappears, and first spacing portion also can play better location.

In an embodiment of the first aspect of the present utility model, the elastic member is a spring, the first ventilation hole penetrates through the first limiting portion, and the first ventilation hole is disposed corresponding to a hollow portion of the spring, so that the compressed spring is used to form a mesh structure while ventilation performance of the first ventilation hole is not affected, and foreign matters in the energy storage device are prevented from entering the first ventilation hole, so that the first ventilation hole is prevented from being blocked.

As an alternative implementation manner, in an embodiment of the first aspect of the present utility model, a surface of the valve body facing the valve cover is provided with a second limiting portion, the second limiting portion is connected to the elastic member, and the second limiting portion is used for limiting a central line of the elastic member and a central line of the valve body to be coaxially arranged so as to prevent the elastic member from running, so that, on one hand, the elastic member is easy to deform along an axial direction of the explosion-proof hole when the elastic member is acted by the valve body, and when the valve body moves towards the valve cover, the valve body can be subjected to smaller resistance from the elastic member so as to open the first hole section, and on the other hand, when the elastic member is acted by the valve cover, the elastic member can not only provide a uniform pushing force along the first direction, so that the valve body is uniformly abutted against the first hole section, and sealing performance is improved; simultaneously, when the valve cover is screwed into the sinking groove, the valve cover can be enabled to bear smaller resistance from the elastic piece, and then the valve cover is conveniently screwed into the sinking groove.

In addition, this second spacing portion also can be used for guiding to a certain extent the elastic component takes place deformation or resumes deformation along the axis direction of explosion-proof hole to the elastic component can utilize this second spacing portion to play the effect of direction when compressed or resume deformation, so that the elastic component can take place deformation smoothly when compressed, and can resume deformation smoothly when the effort that receives reduces or disappears, and second spacing portion also can play better location.

In an embodiment of the first aspect of the present utility model, a first conical inclined surface is disposed at an end of the valve body facing away from the valve cover, a second conical inclined surface is disposed at a joint between the hole wall surface of the first hole section and the hole wall surface of the second hole section, the first conical inclined surface abuts against the second conical inclined surface, and the first conical inclined surface and the second conical inclined surface are used for guiding an end of the valve body facing away from the valve cover to be disposed in the first hole section, so that the end of the valve body facing away from the valve cover is conveniently guided to be extruded into the first hole section to seal the first hole section, thereby further improving the sealing effect of the valve body.

In a second aspect, the utility model discloses an end cover assembly, which comprises a top cover and the explosion-proof valve in the first aspect, wherein the top cover is provided with a through mounting hole, and the shell of the explosion-proof valve is arranged in the mounting hole. It will be appreciated that the end cap assembly having the explosion proof valve according to the first aspect also has all the advantages of the explosion proof valve according to the first aspect, i.e. the end cap assembly having the explosion proof valve according to the first aspect also reduces or eliminates the risk of micro-cracks caused by the breathing effect of charge-discharge expansion of the explosion proof valve during use, improving the safety of the energy storage device.

In a third aspect, the present utility model discloses an energy storage device having an end cap assembly as described in the second aspect above. It will be appreciated that, since the end cap assembly according to the second aspect has all the advantages of the explosion-proof valve according to the first aspect, the energy storage device having the end cap assembly according to the second aspect also has all the technical effects of the explosion-proof valve according to the first aspect, i.e. the energy storage device having the end cap assembly according to the second aspect also reduces or eliminates the risk of micro-cracks caused by the breathing effect of charge-discharge expansion of the explosion-proof valve during use, and improves the safety of the energy storage device.

In a fourth aspect, the utility model discloses a powered device having an energy storage device as described in the third aspect above. It can be understood that, since the energy storage device of the third aspect has all the beneficial effects of the explosion-proof valve of the first aspect, the electric equipment with the energy storage device of the third aspect also has all the technical effects of the explosion-proof valve of the first aspect, and the risk of microcracks caused by the respiratory effect of charge-discharge expansion of the explosion-proof valve in the use process can be reduced or eliminated, so that the safety of the energy storage device is improved.

Compared with the prior art, the utility model has the beneficial effects that:

the explosion-proof valve comprises a shell, a valve cover, a valve body and an elastic piece, wherein the valve cover is used for covering the opening of a second hole section of the shell, a first ventilation hole communicated with the second hole section is formed in the valve cover, and meanwhile, the valve body can move to be sealed outside the first hole section or open the first hole section along the axis direction of an explosion-proof hole relative to the second hole section, so that when the explosion-proof valve is applied to the energy storage device, and the air pressure in the energy storage device is lower than a preset pressure relief threshold value, the valve body abuts against the first hole section to seal, and when the air pressure in the energy storage device is higher than the preset pressure relief threshold value, the air in the energy storage device pushes the valve body to move, opens the first hole section and compresses the elastic piece, so that the first hole section is communicated with the first ventilation hole through a gap between the outer peripheral surface of the valve body and the hole wall surface of the second hole section, and the air in the energy storage device can be released outside the energy storage device through the first hole section, the gap and the first ventilation hole, after the pressure release is completed, the air in the energy storage device can be repeatedly deformed under the action of the elastic piece, the pressure release can be restored under the action of the pressure release, and the explosion-proof cost can be reduced again, and the sealing performance can be realized. Therefore, the explosion-proof valve does not need to be provided with explosion-proof scratches, so that the explosion-proof valve can weaken or eliminate the risk of microcracks caused by the breathing effect of charge and discharge expansion in the use process of the explosion-proof valve, and the safety of the energy storage device is improved; and meanwhile, the explosion-proof valve can be prevented from being completely flushed away when being opened, and a plurality of fragments separated from the top cover of the energy storage device are formed, so that other parts can be protected from being damaged by the explosion of the explosion-proof valve, and the safety of the energy storage device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an explosion-proof valve according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an exploded construction of an explosion-proof valve according to an embodiment of the present utility model;

FIG. 3 is a first top view of an explosion protection valve disclosed in an embodiment of the present utility model;

FIG. 4 is a first cross-sectional view of the explosion valve of FIG. 3 taken along the direction A-A;

FIG. 5 is a second cross-sectional view of the explosion valve of FIG. 3 taken along the direction A-A;

FIG. 6 is an exploded view of FIG. 5;

FIG. 7 is a second top view of the explosion protection valve disclosed in the embodiments of the present utility model;

FIG. 8 is a cross-sectional view of the explosion valve of FIG. 7 taken along the direction B-B;

FIG. 9 is a schematic illustration of the structure of an end cap assembly disclosed in an embodiment of the present utility model;

FIG. 10 is a schematic illustration of an exploded construction of an end cap assembly according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of an energy storage device according to an embodiment of the present utility model;

fig. 12 is an exploded view of an energy storage device according to an embodiment of the present utility model.

Description of the main reference numerals

1-an explosion-proof valve; 11-a housing; 11 a-explosion-proof hole; 111-a first bore section; 111 a-a second conical ramp; 112-a second bore section; 112 a-gap; 1121-a first sub-aperture segment; 1122-a second sub-aperture segment; 113-a sink; 1131-internal threads; 1132-annular groove; 12-a valve cover; 121-a first ventilation hole; 122-external threads; 123-clamping grooves; 124-a first limit; 13-a valve body; 131-grooves; 132-second ventilation holes; 133-a second limit part; 134-a first conical ramp; 14-an elastic member; 15-piston ring.

A 2-end cap assembly; 21-a top cover; 211-mounting holes.

3-an energy storage device; 31-a housing; 311-accommodating chambers; 312-mounting port; 32-cell.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The explosion-proof valve in the related art generally adopts a metal sheet as a valve body, and a weak structure (explosion-proof scratch) is manufactured on the valve body in a stamping mode and the like, so that when the air pressure in the battery reaches the pressure relief threshold of the explosion-proof valve, the gas in the battery can conveniently rush open the explosion-proof valve for pressure relief. However, when the air pressure in the battery is high, the expansion caused by charge and discharge brings about a respiratory effect of the internal air pressure, namely, the circulation increase and decrease of the air pressure in the battery occur. The breathing effect can lead to micro-bulge and shrinkage of the explosion-proof valve, and continuously accumulated stress is caused to the explosion-proof notch, so that the explosion-proof valve is cracked when the air pressure in the battery does not reach the pressure release threshold value, the airtight function of the explosion-proof valve is damaged, and the battery is further caused to have the risks of cell performance reduction and safety failure. Also when the air pressure within the battery reaches the pressure relief threshold, the entire explosion proof valve is easily completely flushed and multiple fragments are formed that separate from the top cover, which fragments are prone to damage to other components.

Based on the method, the explosion-proof valve is provided, and an explosion-proof notch is not required to be arranged, so that the risk of microcrack caused by the breathing effect of charge-discharge expansion in the use process of the explosion-proof valve can be reduced or eliminated, and the safety of the energy storage device is improved; and meanwhile, the explosion-proof valve can be prevented from being completely flushed away when being opened, and a plurality of fragments separated from the top cover of the energy storage device are formed, so that other parts can be protected from being damaged by the explosion of the explosion-proof valve, and the safety of the energy storage device is improved.

The technical scheme of the utility model will be further described with reference to the accompanying drawings.

Referring to fig. 1 to 4, the embodiment of the utility model discloses an explosion-proof valve, the explosion-proof valve 1 comprises a housing 11, a valve cover 12, a valve body 13 and an elastic member 14, the housing 11 is provided with a through explosion-proof hole 11a, the explosion-proof hole 11a comprises a first hole section 111 and a second hole section 112 which are communicated with each other, the radial dimension of the first hole section 111 is smaller than that of the second hole section 112, the valve cover 12 covers the opening of the second hole section 112, the valve cover 12 is provided with a first ventilation hole 121 communicated with the second hole section 112, the valve body 13 is arranged in the second hole section 112, one end of the valve body 13, which is opposite to the valve cover 12, is positioned in the first hole section 111 so as to be sealed in the first hole section 111, the valve body 13 can move to be sealed in the first hole section 111 or open the first hole section 111 along the axial direction of the explosion-proof hole 11a, a gap 112a is formed between the outer peripheral surface of the valve body 13 and the hole wall surface of the second hole section 112, and the first ventilation hole 121 is directly or indirectly communicated with the first ventilation hole 121, and the first ventilation hole 121 can be released from the first ventilation hole 121 through the first ventilation hole 112 when the valve body 13 moves to the first ventilation hole section 112 along the axial direction opposite to the first hole section 112. The elastic member 14 is connected between the valve body 13 and the valve cover 12, and is used for providing an pushing force to the valve body along a first direction, namely, when the gas in the energy storage device pushes the valve body 13 to move relative to the second hole section 112 along a direction opposite to the first direction to open the first hole section 111, the valve body 13 compresses the elastic member 14, and after the internal pressure of the energy storage device is released, the elastic member 14 recovers deformation to provide the pushing force to the valve body 13 along the first direction so as to push the valve body 13 to move to abut against the first hole section 111 along the first direction to seal.

The axial direction of the explosion vent 11a includes a direction in which the elastic member 14 faces the valve body 13 (e.g., downward direction in fig. 5) and a direction in which the elastic member 14 faces the valve cover 12 (e.g., upward direction in fig. 5), and the first direction is configured such that the elastic member 14 in the axial direction of the explosion vent faces the valve body 13, i.e., downward direction in fig. 5.

That is, when the explosion-proof valve 1 of the present application is applied to an energy storage device, and when the air pressure in the energy storage device is lower than the preset pressure release threshold, the air in the energy storage device cannot push the valve body 13 to move towards the valve cover 12 along the axial direction of the explosion-proof hole 11a to compress the elastic element 14, the valve body 13 at this time is abutted against the first hole section 111 to seal, and when the air pressure in the energy storage device is higher than the preset pressure release threshold, the air in the energy storage device pushes the valve body 13 to move towards the valve cover 12 along the axial direction of the explosion-proof hole 11a, the first hole section 111 is opened and the elastic element 14 is compressed, and at this time, the first hole section 111 is communicated with the gap 112a between the outer peripheral surface of the valve body 13 and the hole wall surface of the second hole section 112, so that the first hole section 111 can be communicated with the first air vent 121, and the air in the energy storage device can be released out of the energy storage device through the first hole section 111, thereby achieving the purpose of pressure release prevention, and after the pressure release is completed, the 13 can be abutted against the first hole section 111 again under the pushing action of restoring the elastic element 14 to restore the deformation, thereby realizing the safety and the cost of explosion-proof. Therefore, the explosion-proof valve 1 does not need to be provided with explosion-proof scratches, so that the explosion-proof valve 1 can weaken or eliminate the risk of microcracks caused by the breathing effect of charge and discharge expansion of the explosion-proof valve 1 in the use process, and the safety of the energy storage device is improved; meanwhile, the explosion-proof valve 1 can be prevented from being completely flushed away when being opened, and a plurality of fragments separated from the top cover of the energy storage device are formed, so that other parts can be protected from being damaged by the explosion of the explosion-proof valve 1, and the safety of the energy storage device is improved.

In addition, when the valve body 13 is pushed by the gas in the energy storage device to move towards the valve cover 12 along the axial direction of the explosion-proof hole 11a, the valve cover 12 covers the opening of the second hole section 112, so that the situation that the valve body 13 splashes out of the second hole section 112 to damage other parts can be avoided, and the use safety of the energy storage device is further improved.

In this embodiment, the valve body 13 may be, but is not limited to, a rubber member, a plastic member, a silica gel member, a foam member, etc., and the elastic member 14 may be, but is not limited to, a spring, a silica gel column, a rubber column, a plastic column, a foam column, etc.

It should be noted that, when the end of the valve body 13 facing away from the valve body 13 is sealed to the first hole section 111, the elastic member 14 may be in a natural state, that is, the elastic member 14 is only abutted between the valve cover 12 and the valve body 13, and does not receive the force from the valve cover 12 and the valve body 13, and the elastic member 14 does not apply the force to the valve body 13 at this time; or, the elastic member 14 may be in a compressed state, so that the elastic member 14 will have a tendency to recover deformation, and the elastic member 14 at this time will apply a pressing force to the valve body 13, so that an end of the valve body 13 opposite to the valve body 13 may provide a better sealing effect on the first hole section 111, thereby achieving a better sealing of the interior of the energy storage device.

As can be seen from the foregoing, the gap 112a directly or indirectly communicating with the first ventilation hole 121 is provided between the outer peripheral surface of the valve body 13 and the hole wall surface of the second hole section 112, that is, as shown in fig. 4, the gap 112a may directly communicate with the first ventilation hole 121, or as shown in fig. 5, the gap 112a may indirectly communicate with the first ventilation hole 121, specifically, the second hole section 112 includes a first sub-hole section 1121 and a second sub-hole section 1122 which are mutually communicated, the radial dimension of the first sub-hole section 1121 is larger than the radial dimension of the second sub-hole section 1122 and larger than the radial dimension of the first hole section 111, the valve cover 12 covers the opening of the second sub-hole section 1122, the valve body 13 is disposed on the first sub-hole section 1121, and the other end of the valve body 13 facing the valve cover 12 extends into the second sub-hole section 1122 to be in contact with the hole wall surface of the second sub-hole section 1122. So designed, when the valve body 13 moves along the axial direction of the explosion-proof hole 11a, the circumferential side surface of the valve body 13 can move along the hole wall surface of the second sub-hole section 1122, so that the second sub-hole section 1122 can be utilized to guide the movement of the valve body 13, and the valve body 13 can move more smoothly, so that when the air pressure in the energy storage device reaches the preset pressure release threshold value, the valve body 13 can quickly and timely open the first hole section 111 for explosion-proof pressure release. And the surface of the valve body 13 facing the valve cover 12 side is recessed in the valve body 13 to form a groove 131, the groove 131 is communicated with the first ventilation hole 121, the valve body 13 is further provided with a second ventilation hole 132, the second ventilation hole 132 penetrates through the side wall of the groove 131 to enable the groove 131 to be communicated with the second hole section 112, so that the gap 112a can be communicated with the first ventilation hole 121 through the second ventilation hole 132 and the groove 131, when the valve body 13 moves to open the first hole section 111, the first hole section 111 can be communicated with the first ventilation hole 121 through the gap 112a, the second ventilation hole 132 and the groove 131 in sequence, and therefore gas in the energy storage device can be released to the outside of the energy storage device through the first hole section 111, the second hole section 112, the second ventilation hole 132, the groove 131 and the first ventilation hole 121, and the purpose of pressure relief and explosion prevention can be achieved.

Illustratively, the second ventilation holes 132 may be a plurality, for example, two, three, four, five, six or more, the plurality of second ventilation holes 132 are arranged at intervals around the axis of the explosion-proof hole 11a, and the plurality of second ventilation holes 132 are respectively communicated with the grooves 131. The provision of the plurality of second ventilation holes 132 can increase the path of the gas in the second hole section 112 into the groove 131, thereby enabling the gas to be rapidly discharged to the first ventilation holes 121 so as to be rapidly discharged to the outside.

Further, when the surface of the valve body 13 facing the valve cover 12 is recessed in the valve body 13 to form the recess 131, the elastic member 14 may be at least partially disposed in the recess 131, that is, only a portion of the elastic member 14 may be disposed in the recess 131, or the entire elastic member 14 may be disposed in the recess 131, so that the space occupied by the elastic member 14 is mainly the inner space of the valve body 13, which is beneficial to making the overall structure of the explosion-proof valve 1 compact, reducing the overall volume of the explosion-proof valve 1, and further being beneficial to implementing the miniaturized design of the explosion-proof valve 1.

In some embodiments, the valve cover 12 can move along the axial direction of the explosion proof hole 11a relative to the second hole section 112 and compress the elastic member 14 to provide a pressing force to the valve body 13 along the first direction, that is, when the valve cover 12 moves along the axial direction of the explosion proof hole 11a relative to the second hole section 112 toward the valve body 13, the valve cover 12 compresses the elastic member 14, and at the same time, the valve body 13 is compressed by the pressing force, so that the radial dimension of the valve body 13 is enlarged, so that the end of the valve body 13 facing away from the valve cover 12 can be disposed in the first hole section 111 in an interference manner, thereby achieving the effect of sealing the first hole section 111. The valve cover 12 can move relative to the second hole section 112 along the axial direction of the explosion-proof hole 11a, so that the position of the valve cover 12 in the second hole section 112 can be regulated, the compression amount of the elastic piece 14 can be regulated, the compression force acting on the valve body 13 can be regulated, and the compression amount of the valve body 13 can be regulated, so that one end, back to the valve cover 12, of the valve body 13 can effectively seal the first hole section 111, and the sealing effect of the valve body 13 can be effectively improved.

It should be noted that, the magnitude of the compression amount of the valve body 13 may affect the sealing effect of the end of the valve body 13 facing away from the valve cover 12 on the first hole section 111, the greater the compression amount of the valve body 13, the better the sealing effect of the end of the valve body 13 facing away from the valve cover 12 on the first hole section 111, but a great pushing force is required to push the valve body 13 to move along the axis direction of the explosion-proof hole 11a toward the valve cover 12, which requires that the air pressure in the energy storage device reaches a high level to push the valve body 13 to move along the axis direction of the explosion-proof hole 11a toward the valve cover 12, so that when the air pressure of the energy storage device reaches a preset pressure release threshold, the air of the energy storage device cannot push the valve body 13, so that the air in the energy storage device cannot be discharged in time, and the probability of explosion of the energy storage device is easily increased, and based on this, the compression amount of the valve body 13 may be 25% -50%, for example 25%, 27%, 29%, 30%, 32%, 35%, 37%, 38%, 39%, 40%, 42%, 45%, 48% or 50%. Through controlling the compression of the valve body 13 in the range of 25% -50%, the sealing performance of the valve body 13 for sealing the first hole section 111 is optimal, when the air pressure of the energy storage device reaches a preset pressure release threshold value, the air of the energy storage device can push the valve body 13, so that the air in the energy storage device can be discharged in time, the purpose of pressure release and explosion prevention is achieved, and the risk of explosion of the energy storage device is reduced.

As an alternative embodiment, as shown in fig. 3 to 6, the end surface of the housing 11 is recessed in the housing 11 to form a countersink 113, the countersink 113 is connected to the second sub-hole section 1122 of the second hole section 112, the valve cover 12 is disposed in the countersink 113 to cover the opening of the second sub-hole section 1122 of the second hole section 112, wherein the outer circumferential surface of the valve cover 12 is provided with an external thread 122, the position of the hole wall surface of the countersink 113 corresponding to the external thread 122 is provided with an internal thread 1131, and the external thread 122 is cooperatively connected with the internal thread 1131, so that the valve cover 12 can move relative to the second hole section 112 along the axial direction of the explosion proof hole 11a when the valve cover 12 is rotated, and the valve cover 12 can be kept at the current position when the rotation of the valve cover 12 is stopped. By means of the design, the depth of the valve body 13 screwed in can be controlled through controlling the angle of the rotary valve body 13, namely, the distance that the valve body 13 moves towards the valve body 13 along the axis direction of the explosion-proof hole 11a is controlled, and the compression amount of the elastic piece 14 is controlled, so that the compression amount of the valve body 13 is conveniently controlled, the valve body 13 is not limited to be jacked up for explosion-proof pressure relief only when the air pressure of the energy storage device reaches a specific preset pressure relief threshold value, and the explosion-proof valve 1 is further applicable to energy storage devices with different preset pressure relief thresholds.

In the embodiment shown in fig. 5 and 6, the radial dimension of the countersink 113 is greater than the radial dimension of the second sub-hole section 1122, so that the bottom surface of the countersink 113 can be used to abut against the valve cover 12 to limit the distance between the valve cover 12 and the valve body 13, that is, when the valve cover 12 is screwed to move the valve cover 12 relative to the countersink 113 to abut against the bottom surface of the countersink 113, the valve cover 12 cannot continue to move relative to the countersink 113 in the original direction, so as to avoid the situation that the end, facing away from the valve cover 12, of the valve body 13 in the energy storage device is difficult to be propped out of the first hole section 111 due to the excessive compression of the valve body 13 caused by the excessive compression of the elastic member 14, thereby ensuring that the valve body 13 can be propped open by the gas in the energy storage device when the air pressure of the energy storage device reaches the preset pressure release threshold, and further playing the role of explosion and pressure release.

Further, in order to facilitate rotation of the valve cover 12, a clamping groove 123, such as a straight groove, a cross groove, or a rice groove, is provided on a surface of the valve cover 12 facing away from the elastic member 14, and the clamping groove 123 is used for inserting a disassembling tool (such as a straight screwdriver, a cross screwdriver, or a rice screwdriver) to rotate the valve cover 12, so that when the valve cover 12 is rotated, the disassembling tool can be used to screw the valve cover 12 to facilitate screwing of the valve cover 12 in the sink groove 113, thereby facilitating rotation of the valve cover 12.

In this embodiment, when assembling, the valve body 13 is first mounted on the first sub-hole section 1121 of the second hole section 112 of the housing 11, and the other end of the valve body 13 facing the valve cover 12 is located in the second sub-hole section 1122 of the second hole section 112, then one end of the elastic member 14 is abutted against the valve body 13, and then the valve cover 12 is mounted in the sinking groove 113 and rotated by inserting the dismounting tool into the clamping groove 123 of the valve cover 12, so as to adjust the depth to which the valve cover 12 is screwed to control the pressing force required by the elastic member 14, and the valve body 13 can be pressed by the pressing force from the elastic member 14, so that the end of the valve body 13 facing away from the valve cover 12 can be inserted into the first hole section 111 and sealed in the first hole section 111, thereby realizing the sealing inside the energy storage device. When the pressure generated in the energy storage device is too high, for example, greater than or equal to 0.6MPa, the internal pressure of the energy storage device exceeds the pressing force exerted on the valve body 13 by the elastic element 14, the valve body 13 is pushed open along the direction towards the valve cover 12, the first hole section 111 is opened, so that the gas generated in the energy storage device can be discharged to the second hole section 112, and the gas entering the second hole section 112 can be timely discharged to the outside through the second ventilation hole 132, the groove 131 and the first ventilation hole 121 in sequence, thereby achieving the purposes of explosion prevention and pressure relief as well as explosion prevention.

As another alternative embodiment, as shown in fig. 7 and 8, the hole wall surface of the second sub-hole section 1122 of the second hole section 112 is formed with a plurality of annular grooves 1132, the plurality of annular grooves 1132 are arranged at intervals along the axis direction of the explosion-proof hole 11a, the explosion-proof valve 1 further comprises a piston ring 15, the piston ring 15 is abutted against the valve body 13, and the piston ring 15 is detachably connected to any annular groove 1132, so as to change the position of the valve cover 12 in the second hole section 112, thereby being capable of regulating the compression amount of the elastic member 14, further being capable of controlling the compression amount of the valve body 13, so that the valve body 13 is not limited to being jacked for explosion-proof pressure relief only when the air pressure of the energy storage device reaches a specific preset pressure relief threshold, and the explosion-proof valve 1 of the present application can be applied to energy storage devices with different preset pressure relief thresholds, and has higher applicability.

In some embodiments, as shown in fig. 5, 6 and 8, a surface of the valve cover 12 facing the valve body 13 is provided with a first limiting portion 124, where the first limiting portion 124 is connected to the elastic member 14, and the first limiting portion 124 is used to limit the centerline of the elastic member 14 and the centerline of the valve cover 12 to be coaxially disposed, that is, the centerline of the elastic member 14 may be disposed substantially in line with the centerline of the valve cover 12 to prevent the elastic member 14 from running, so that, on one hand, the elastic member 14 is easy to deform along the axis direction of the explosion-proof hole 11a when the valve body 13 is acted on by the valve body 13, so that when the valve body 13 moves towards the valve cover 12, the valve body 13 can receive a smaller resistance from the elastic member 14 to facilitate opening the first hole section 111; on the other hand, the elastic piece 14 is easy to deform along the axial direction of the explosion-proof hole 11a when the elastic piece receives the acting force of the valve cover 12, so that not only can uniform pushing force along the first direction be provided, but also the valve body 13 can be uniformly abutted against the first hole section 111, and the sealing performance is improved; at the same time, when the valve cover 12 is screwed into the sinking groove 113, the valve cover 12 can be subjected to small resistance from the elastic piece 14, so that the valve cover 12 can be conveniently screwed into the sinking groove 113.

In addition, the first limiting portion 124 can also be used to guide the elastic member 14 to deform or recover deformation along the axial direction of the explosion-proof hole 11a to a certain extent, so that the elastic member 14 can play a guiding role by using the first limiting portion 124 when being compressed or recovering deformation, so that the elastic member 14 can be smoothly deformed when being compressed, and can be smoothly recovered to deform when the acting force is reduced or eliminated, and the first limiting portion 124 can also play a better role in positioning and limiting.

For example, the first limiting portion 124 may be a limiting protrusion or a limiting groove, and when the first limiting portion 124 is a limiting protrusion, the elastic member 14 may be sleeved on the periphery of the limiting protrusion, so as to limit and guide the elastic member 14; when the first limiting portion 124 is a limiting groove, one end of the elastic member 14 may be disposed in the guiding groove, so that the elastic member 14 may also be limited and guided.

As can be seen from the foregoing, the elastic member 14 may be a spring, and when the elastic member 14 is a spring, the first air hole 121 penetrates through the first limiting portion 124, and the first air hole 121 is disposed corresponding to the hollow portion of the spring, so that the compressed spring is utilized to form a mesh structure while the air permeability of the first air hole 121 is not affected, so as to prevent foreign matters in the energy storage device from entering the first air hole 121, thereby avoiding blocking the first air hole 121.

In some embodiments, a surface of the valve body 13 facing the valve cover 12 may be provided with a second limiting portion 133, where the second limiting portion 133 is used to limit a center line of the elastic member 14 and a center line of the valve body 13 to be coaxially disposed so as to prevent the elastic member 14 from running, so that, on one hand, the elastic member 14 is easy to deform along an axial direction of the explosion-proof hole 11a when the elastic member 14 is acted on by the valve body 13, and thus, when the valve body 13 moves toward the valve cover 12, the valve body 13 can be subjected to a smaller resistance from the elastic member 14 so as to open the first hole section 111; on the other hand, the elastic piece 14 is easy to deform along the axial direction of the explosion-proof hole 11a when the elastic piece receives the acting force of the valve cover 12, so that not only can uniform pushing force along the first direction be provided, but also the valve body 13 can be uniformly abutted against the first hole section 111, and the sealing performance is improved; at the same time, when the valve cover 12 is screwed into the sinking groove 113, the valve cover 12 can be subjected to small resistance from the elastic piece 14, so that the valve cover 12 can be conveniently screwed into the sinking groove 113.

In addition, the second limiting portion 133 can also be used to guide the elastic member 14 to deform or recover deformation along the axial direction of the explosion-proof hole 11a to a certain extent, so that the elastic member 14 can use the second limiting portion 133 to play a guiding role when being compressed or recovering deformation, so that the elastic member 14 can be deformed smoothly when being compressed, and can recover deformation smoothly when the acting force received is reduced or eliminated, and the second limiting portion 133 can also play a better role in positioning.

It can be appreciated that the second limiting portion 133 is disposed at the bottom surface of the recess 131 when the surface of the valve body 13 facing the valve cover 12 is recessed in the valve body 13 to form the recess 131. For example, the second limiting portion 133 may be a limiting protrusion or a limiting groove, and when the second limiting portion 133 is a limiting protrusion, the elastic member 14 may be sleeved on the periphery of the limiting protrusion to prevent the elastic member 14 from running, so as to limit and guide the elastic member 14; when the second limiting portion 133 is a limiting groove, one end of the elastic member 14 can be embedded in the limiting groove, so that the elastic member 14 can be prevented from running, and the elastic member 14 can be limited and guided.

Preferably, the first limiting part 124 is arranged on the surface of the valve cover 12 facing the valve body 13, and the second limiting part 133 is arranged on the surface of the valve body 13 facing the valve cover 12, so that the elastic piece 14 can be better limited and guided.

In some embodiments, as shown in fig. 5, 6 and 8, a first tapered inclined surface 134 is disposed at an end of the valve body 13 facing away from the valve cover 12, a second tapered inclined surface 111a is disposed at a connection portion between a hole wall surface of the first hole section 111 and a hole wall surface of the second hole section 112, the first tapered inclined surface 134 is abutted against the second tapered inclined surface 111a, and one ends of the first tapered inclined surface 134 and the second tapered inclined surface 111a for guiding the valve body 13 facing away from the valve cover 12 are disposed in the first hole section 111, so that not only the end of the valve body 13 facing away from the valve cover 12 can be guided by the second tapered inclined surface 111a to be extruded into the first hole section 111 by matching with the first tapered inclined surface 134, so as to seal the first hole section 111, thereby further improving the sealing effect of the valve body 13.

It will be appreciated that in other embodiments, the end of the valve body 13 facing away from the valve cover 12 may be provided with a first guiding cambered surface, and the junction between the hole wall surface of the first hole section 111 and the hole wall surface of the second hole section 112 is provided with a second guiding cambered surface, where the first guiding cambered surface abuts against the second guiding cambered surface, so that the end of the valve body 13 facing away from the valve cover 12 is guided by the cooperation of the first guiding cambered surface and the second guiding cambered surface to be extruded into the first hole section 111 to seal the first hole section 111.

Referring to fig. 9 and 10, a second aspect of the present utility model discloses an end cap assembly, wherein the end cap assembly 2 includes a top cap 21 and the explosion-proof valve 1 as described above, the top cap 21 is provided with a through mounting hole 211, and the housing 11 of the explosion-proof valve 1 is disposed in the mounting hole 211. It will be appreciated that the end cap assembly 2 having the explosion proof valve 1 described above can provide the same or similar benefits, and reference is specifically made to the foregoing description and will not be repeated here.

Referring to fig. 11 and 12, a third aspect of the present utility model discloses an energy storage device 3 having an end cap assembly 2 as described above. It will be appreciated that the energy storage device 3 having the end cap assembly 2 described above has all the technical effects of the explosion-proof valve 1 described above, and thus the energy storage device 3 also has all the technical effects of the explosion-proof valve 1 described above, and specific reference to the foregoing description will not be repeated here.

In this embodiment, the energy storage device 3 may be, but is not limited to, a single battery, a battery module, a battery pack, an energy storage electric cabinet, or an energy storage container system, wherein when the energy storage device 3 is a single battery, it may be a square battery, for example, as shown in fig. 11 and 12, the energy storage device 3 as a single battery may further include a housing 31 and a battery cell 32, the housing 31 has a receiving cavity 311, the receiving cavity 311 has a mounting hole 312 communicating with an external space, the battery cell 32 may be disposed in the receiving cavity 311 through the mounting hole 312, and the top cover 21 of the end cover assembly 2 is connected to the housing 31 and seals the mounting hole 312 so that the battery cell 32 may be sealed in the receiving cavity 311. When the energy storage device 3 is a battery pack, the energy storage device 3 as a battery pack may include a plurality of unit cells connected in series or in parallel.

In a fourth aspect, the utility model discloses an electrical consumer having an energy storage device as described above. The electric equipment can be, but is not limited to, an electric automobile, an electric bicycle, industrial equipment (such as a machine tool) or household equipment (such as an air conditioner, a television and the like), and the energy storage device is used as an operating power supply of the automobile, the industrial equipment or the household equipment and the like and is used for working power requirements during starting and running of the electric automobile, the electric bicycle, the industrial equipment or the household equipment and the like. It can be understood that the electric equipment with the energy storage device has all the technical effects of the explosion-proof valve, so that the electric equipment also has all the technical effects of the explosion-proof valve, and the description can be specifically referred to and is not repeated herein.

The explosion-proof valve, the end cover assembly, the energy storage device and the electric equipment disclosed by the embodiment of the utility model are described in detail, specific examples are applied to the principle and the implementation mode of the utility model, and the description of the above embodiment is only used for helping to understand the explosion-proof valve, the end cover assembly, the energy storage device and the electric equipment and the core ideas of the explosion-proof valve, the end cover assembly, the energy storage device and the electric equipment; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present utility model, the present disclosure should not be construed as limiting the present utility model in summary.

Claims

1. An explosion-proof valve, characterized in that the explosion-proof valve comprises:

the valve cover covers the opening of the second hole section and is provided with a first ventilation hole communicated with the second hole section;

the valve body is arranged in the second hole section, one end of the valve body, which is opposite to the valve cover, is positioned in the first hole section so as to be sealed in the first hole section, the valve body can move relative to the second hole section along the axis direction of the explosion-proof hole to be sealed in the first hole section or open the first hole section, a gap which is directly or indirectly communicated with the first air vent is formed between the outer peripheral surface of the valve body and the hole wall surface of the second hole section, and when the valve body moves relative to the second hole section along the axis direction of the explosion-proof hole to be communicated with the first hole section, the first hole section is communicated with the first air vent through the gap; and

2. The explosion-proof valve according to claim 1, wherein the second hole section comprises a first sub-hole section and a second sub-hole section which are communicated with each other, the radial dimension of the first sub-hole section is larger than that of the second sub-hole section and larger than that of the first hole section, the valve cover covers the opening of the second sub-hole section, the valve body is arranged on the first sub-hole section, the gap is formed between the outer peripheral surface of the valve body and the hole wall surface of the first sub-hole section, and the other end of the valve body facing the valve cover extends into the second sub-hole section to be attached to the hole wall surface of the second sub-hole section;

the surface of the valve body facing one side of the valve cover is concave in the valve body to form a groove, the groove is communicated with the first air holes, the valve body is provided with second air holes, the second air holes penetrate through the side walls of the groove, so that the groove is communicated with the gap, the gap is communicated with the first air holes through the second air holes and the groove, the valve body moves to open the first hole section along the axis direction of the explosion-proof hole relative to the second hole section, and the first hole section sequentially passes through the gap, the second air holes and the groove to be communicated with the first air holes.

3. The explosion protection valve of claim 1, wherein said valve cover is movable relative to said second bore section along an axial direction of said explosion proof bore and compresses said resilient member to provide a compressive force against said valve body along said first direction.

4. The explosion-proof valve according to claim 3, wherein an end face of the housing is recessed in the housing to form a sink groove, the sink groove is communicated with the second hole section, the valve cover is arranged in the sink groove to cover an opening of the second hole section, an external thread is arranged on the outer peripheral surface of the valve cover, an internal thread is arranged on a position, corresponding to the external thread, of the wall surface of the sink groove, and the external thread is in fit connection with the internal thread, so that the valve cover can move relative to the second hole section along the axial direction of the explosion-proof hole when the valve cover is rotated; or alternatively

The hole wall surface of the second hole section is provided with a plurality of annular grooves which are arranged at intervals along the axis direction of the explosion-proof hole, the explosion-proof valve further comprises a piston ring, the piston ring is abutted to the valve cover, and the piston ring is detachably connected with any one of the annular grooves so as to change the position of the valve cover in the second hole section.

5. The explosion-proof valve according to claim 3, wherein a first limiting portion is arranged on a surface of the valve cover facing the valve body, the first limiting portion is connected to the elastic member, and the first limiting portion is used for limiting the center line of the elastic member and the center line of the valve cover to be coaxially arranged.

6. The explosion-proof valve according to claim 5, wherein the elastic member is a spring, the first vent penetrates the first limiting portion, and the first vent is disposed corresponding to a hollow portion of the spring.

7. The explosion-proof valve according to any one of claims 1 to 6, wherein a second limiting portion is provided on a surface of the valve body facing the valve cover, the second limiting portion is connected to the elastic member, and the second limiting portion is configured to limit a center line of the elastic member and a center line of the valve body to be coaxially disposed.

8. The explosion-proof valve according to any one of claims 1-6, wherein a first conical inclined surface is arranged at one end of the valve body, which is opposite to the valve cover, and a second conical inclined surface is arranged at the joint of the hole wall surface of the first hole section and the hole wall surface of the second hole section, wherein the first conical inclined surface is abutted to the second conical inclined surface, and the first conical inclined surface and the second conical inclined surface are used for guiding one end part of the valve body, which is opposite to the valve cover, to extend into and be abutted to the first hole section.

9. An end cap assembly comprising a cap and an explosion proof valve as claimed in any one of claims 1 to 8, the cap being provided with a mounting hole therethrough, the housing of the explosion proof valve being provided in the mounting hole.

10. An energy storage device having the end cap assembly of claim 9.

11. A powered device having an energy storage device as defined in claim 10.