EP4646759A1

EP4646759A1 - Explosion-proof venting valve with locking structure

Info

Publication number: EP4646759A1
Application number: EP24715430.5A
Authority: EP
Inventors: Xinli Wang; Yang Li; Xinru PAN; Wangxuan HAN
Original assignee: Mann and Hummel GmbH
Current assignee: Mann and Hummel GmbH
Priority date: 2024-03-11
Filing date: 2024-03-11
Publication date: 2025-11-12
Also published as: WO2025189306A1; CN121039882A

Abstract

An explosion-proof venting valve (100) for a battery pack includes a protective cover (1) including at least one first venting hole (11), acover seat (3) removably engaged with the protective cover (1), the cover seat (3) including a locking hole (34) extending radially relative to a longitudinal axis (30) of the explosion-proof venting valve (100), amembrane (2) that is water-impermeable and is gas-permeable, the membrane (2) being interposed between the cover seat (3) and the protective cover (1), and a valve body (5) including a hollow main body portion (52), ahollow cylindrical central portion (57), aplurality of ribs extending radially between the main body portion (52) and the central portion (57), and a plurality of relief holes (51) interposed between the plurality of ribs, the main body portion (52) and the central portion (57).

Description

Explosion-Proof Venting Valve with Locking Structure

Technical Field

Embodiments relate to an explosion-proof venting valve, and more specifically to an explosion-proof venting valve for a battery pack used for example in an electric vehicle.

Background Art

In general, due to the change of altitude and ambient temperature during driving electric vehicles, there is a significant pressure difference between interior and exterior of the battery pack. If the pressure difference between interior and exterior of the battery pack is not balanced in time, the battery pack will have a risk of compression deformation and expansion or even bursting under the action of the pressure difference. In some cases, a large amount of gases will be released in the case of thermal runaway of the battery cell inside the battery pack, and if these gases are not discharged to the exterior of the battery pack in time, internal pressure of the battery pack will rise sharply in a short period of time, resulting in bursting or even explosion of the battery pack, which will affect safety of passengers.
Therefore, it is necessary to install an explosion-proof vent valve at an outer end of the battery pack to equalize the pressure, while reducing the effect of water condensation on the battery pack and providing explosion-proof function in emergency conditions. Connection between a cover and a valve body in the existing explosion-proof venting valve is relatively complex, and it is difficult to meet the emergency pressure relief requirements required by the battery pack under different operating conditions.
To this end, it is desirable to develop an explosion-proof venting valve that is simple in structure, and can reliably work under different operating conditions.

Summary

An object of the present disclosure is to provide an explosion-proof venting valve that is simple in structure, and can reliably work under different operating conditions.
In one aspect, an explosion-proof venting valve for a battery pack is provided. The explosion-proof venting valve includes: a protective cover provided with at least one first venting hole; a cover seat removably engaged with the protective cover, the cover seat is provided with a locking hole extending radially relative to a longitudinal axis of the explosion-proof venting valve; a membrane which is water-impermeable and is gas-permeable, the membrane is disposed on the cover seat between the cover seat and the protective cover; a valve body including a hollow main body portion, a hollow cylindrical central portion and a plurality of ribs extending radially between the main body portion and the central portion, a plurality of relief holes are formed between the plurality of ribs, the main body portion and the central portion, the main body portion includes a cylindrical locking housing extending from side wall of the main body portion in a radially inward direction perpendicular to the longitudinal axis of the explosion-proof venting valve and defining a cylindrical locking cavity aligned with the locking hole; and a self-locking mechanism including a locking pin and a biasing spring disposed in the cylindrical locking cavity, the locking pin includes a first end portion slidably housed in the cylindrical locking cavity and a second end portion which can be received in the locking hole, the biasing spring is disposed between the side wall of the main body portion and the first end portion of the locking pin and is configured to bias the second end portion of the locking pin into the locking hole.
The cover seat may include a hollow cylindrical base portion, a first horizontal portion extending radially outwards from the base portion, a cylindrical first vertical portion extending upwards around the first horizontal portion, a second horizontal portion extending radially outwards from the first vertical portion, and a cylindrical second vertical portion extending upwards around the second horizontal portion, the base portion may define a seat venting passage, and the locking hole may extend radially through side wall of the base portion.
The protective cover may include a top wall on which the at least one first venting hole is provided and a plurality of first locking members disposed circumferentially around the top wall, the cover seat may further include a plurality of second locking members circumferentially aligned with the plurality of first locking members.
The first locking members may be snap lugs extending downwards from the top wall, each snap lug may define a second venting hole, the second locking members are protrusions, each protrusion may be provided with a third venting holes, which extends through the protrusion and the second vertical portion and is in communication with respective second venting hole, and the snap lug can be snapped over corresponding protrusion, so as to fix the protective cover and the cover seat in place.
The membrane may be disposed on the second horizontal portion, so as to define a venting chamber between the membrane, the first vertical portion and the first horizontal portion which communicates with the at least one first venting hole.
The main body portion may be provided with threads on an outer surface thereof, so as to engage with corresponding threads on the battery pack.
The valve body may further include a flange portion which extends upwards and outwards from the main body portion and has an inner diameter larger than an inner diameter of the main body portion, so as to receive the cover seat on the main body portion, the flange portion may be provided with a first circumferential sealing groove on lower surface thereof, for receiving a first seal configured to seal between the valve body and the battery pack.
Interior surface of the flange portion or outer surface of the first vertical portion may be provided with a second circumferential sealing groove for receiving a second seal configured to seal between the valve body and the first vertical portion.
The first end portion may include a plug, the second end portion may have a smaller diameter than the first end portion and can be received in the locking hole.
Interior surface of the cylindrical locking housing or outer surface of the first end portion may be provided with a circumferential plug sealing groove on outer surface thereof, the circumferential plug sealing groove is configured to house a plug seal configured to seal between the first end portion and the cylindrical locking housing.
Top surface of the main body portion may flush with top surface of the central portion, the main body portion extends a first length downward along the longitudinal axis of the explosion-proof venting valve, the central portion extends a second length downward along the longitudinal axis of the explosion-proof venting valve, the first length is larger than the second length.
The central portion may include a cylindrical receiving hole for receiving the base portion;
wherein when the battery pack is under normal operation conditions, the biasing spring may bias the second end portion of the locking pin into the locking hole and the cover seat seats against the central portion and the main body portion and thus blocks the plurality of relief holes;
when a pressure of the interior of the battery pack is less than environment pressure, the explosion-proof venting valve is in a normal suction state, surrounding gas will flow into the battery pack via the at least one first venting hole, the second venting hole, the third venting holes, the membrane, the venting chamber and the seat venting passage;
when the pressure of the interior of the battery pack is greater than the environment pressure but a pressure difference between interior and exterior of the battery pack is lower than a predetermined threshold, the explosion-proof venting valve is in a normal expiration state, gas within the battery pack will flow out of the battery pack via the at least one first venting hole, the second venting hole, the third venting holes, the membrane, the venting chamber and the seat venting passage; and
when the pressure of the interior of the battery pack is greater than the environment pressure and the pressure difference between interior and exterior of the battery pack increases above the predetermined threshold, the explosion-proof venting valve is in a blasting state, the pressure difference overcomes the biasing force of the biasing spring, so as to urge the locking pin away from the locking hole and disengage from the locking hole, the cover seat and the protective cover bounce off from the valve body, and gas within the battery pack can be relieved to surrounding environment via the plurality of relief holes.
The main body portion may be provided with at least one equilibrium hole extending through the side wall of the main body portion and communicating between the cylindrical locking cavity and exterior of the main body portion, so as to facilitate sliding movement of the locking pin inside the cylindrical locking cavity.
At least one web may be disposed within at least one equilibrium hole and integrated with the main body portion.
By means of the self-locking mechanism, the locking pin is reliably positioned in the locking hole, thus ensuring the normal operation of the battery pack.
By means of the equilibrium hole, the locking pin can be reliably pushed away from the locking hole and disengage from the locking hole when the explosion-proof venting valve is in the blasting state, thus protecting the battery pack and safety of passengers for emergencies.
In addition, since the locking pin extends perpendicular to the longitudinal axis of the explosion-proof venting valve and thus has little contact area with the gas flow in the battery pack, the gas flow has little influence on the locking pin, thus, the cost of the locking pin is low and the reliability of the locking pin is high. In addition, the biasing spring can be small in size, thus saving the space of the explosion-proof venting valve.
The spring constant of the biasing spring can be adjusted for different application scenarios and internal pressure emergency relief demands, thus exhibiting excellent scalability.
In addition, the explosion-proof venting valve is provided with two groups of venting holes, thus exhibiting excellent performance under the normal operation of the battery pack.
Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims and the drawings. The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

Brief Description of Drawings

The present disclosure will become more fully understood from the detailed description and the accompanying drawings.
Fig. 1 is a schematic explosive view of an example explosion-proof venting valve according to embodiments.
Fig. 2 is a schematic cross-sectional view of an example explosion-proof venting valve according to embodiments wherein the explosion-proof venting valve is in a normal suction state.
Fig. 3 is a schematic cross-sectional view of an example explosion-proof venting valve according to embodiments wherein the explosion-proof venting valve is in a normal expiration state.
Fig. 4 is a schematic cross-sectional view of an example explosion-proof venting valve according to embodiments wherein the explosion-proof venting valve is to be in a blasting state.
Fig. 5 is a schematic cross-sectional view of an example explosion-proof venting valve according to embodiments wherein the explosion-proof venting valve is in a blasting state.
Fig. 6 is a schematic close-up view of an example configuration of the equilibrium hole of the main body portion of the explosion-proof venting valve according to embodiments.

Description of Embodiments

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features. Additionally, the drawings are generally schematic and not necessarily to scale. Some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present disclosure.
Certain terminology may be used in the following description for the purpose of reference only, and thus are not intended to be limiting. For example, terms such as “above” and “below” refer to directions in the drawings to which reference is made. Terms such as “front” , “back” , “fore” , “aft” , “left” , “right” , “rear” , “side” , “upward” , “downward” , “horizontal” , “vertical” , “top” , and “bottom” , etc., describe the orientation and/or location of portions of the components or elements within a consistent but arbitrary frame of reference, which is made clear by reference to the text and the associated drawings describing the components or elements under discussion.
Furthermore, terms such as “first” , “second” , “third” , and so on may be used to describe separate components. Such terminology are used descriptively for the figures, and do not represent limitations on the scope of the disclosure, as defined by the appended claims.
Referring now to the drawings, wherein like reference numbers refer to like features throughout the several views, Fig. 1 is a schematic explosive view of an example explosion-proof venting valve 100 according to embodiments.
According to one example, the explosion-proof venting valve 100 may include a protective cover 1, a cover seat 3 removably engaged with the protective cover 1; a membrane 2; a valve body 5; and a self-locking mechanism including a locking pin 8 and a biasing spring 7. The explosion-proof venting valve 100 may include other components as needed, such as a seal, etc., without departing the scope of the disclosure. The protective cover 1, the cover seat 3 and the membrane 2 form a cover assembly 110.
According to one example, the protective cover 1 may include a top wall on which at least one first venting hole 11 is provided and a plurality of first locking members 12 disposed circumferentially around the top wall. The protective cover 1 is used to protect the membrane 2 from damage. According to one example, the first locking members 12 are snap lugs extending downwards from the top wall, each snap lug defines a second venting hole 13. By means of providing two groups of venting holes, i.e., the first venting hole 11 and the second venting hole 13, the explosion-proof venting valv e100 may exhibit excellent performance under the normal operation of the battery pack. Although Fig. 1 shows twelve first venting holes 11 and six first locking members 12, as shall be understood for those skilled in the art, the number of the first venting holes 11 and the first locking members 12 can be any other suitable values, without departing the scope of the disclosure.
Now referring to Fig. 2 to Fig. 5, Fig. 2 is a schematic cross-sectional view of an example explosion-proof venting valve 100 according to embodiments wherein the explosion-proof venting valve 100 is in a normal suction state. Fig. 3 is a schematic cross-sectional view of an example explosion-proof venting valve 100 according to embodiments wherein the explosion-proof venting valve 100 is in a normal expiration state. Fig. 4 is a schematic cross-sectional view of an example explosion-proof venting valve 100 according to embodiments wherein the explosion-proof venting valve 100 is to be in a blasting state. Fig. 5 is a schematic cross-sectional view of an example explosion-proof venting valve 100 according to embodiments wherein the explosion-proof venting valve 100 is in a blasting state.
According to one example, the cover seat 3 may include a hollow cylindrical base portion 33, a first horizontal portion 37 extending radially outwards from the base portion 33, a cylindrical first vertical portion 35 extending upwards around the first horizontal portion 37, a second horizontal portion 36 extending radially outwards from the first vertical portion 35, and a cylindrical second vertical portion 38 extending upwards around the second horizontal portion 36, the base portion 33 defines a seat venting passage 17. The base portion 33 is provided with a locking hole 34 extends radially relative to a longitudinal axis 30 of the explosion-proof venting valve 100 through side wall of the base portion 33. However, as shall be understood for those skilled in the art, the cover seat 3 can utilize other structure and may include other components as needed, such as a seal, etc., as long as the locking hole 34 is provided to extend radially relative to the longitudinal axis 30 of the explosion-proof venting valve 100, without departing the scope of the disclosure.
The cover seat 3 may further include a plurality of second locking members 32 circumferentially aligned with the plurality of first locking members 12. According to one example, the second locking members 32 are protrusions, each protrusion is provided with a third venting holes 31, which extends through the protrusion and the second vertical portion 38 and is in communication with respective second venting hole 13. The snap lug can be snapped over corresponding protrusion, so as to fix the protective cover 1 and the cover seat 3 in place. However, as shall be understood for those skilled in the art, the first locking members 12 and the second locking members 32 may be other types of self-locking mechanism as needed, such as a screw connection, etc., without departing the scope of the disclosure.
According to one example, the membrane 2 is water-impermeable and is gas-permeable. The membrane 2 can be formed of a microporous material. The micropores in the material enable a gas transport through the membrane but prevent moisture transport through the membrane. In particular, the membrane 2 can be formed of for example porous polytetrafluoroethylene, however, as shall be understood for those skilled in the art, the membrane 2 may be formed of any other suitable materials as needed, without departing the scope of the disclosure. The membrane 2 is disposed on the cover seat 3 between the cover seat 3 and the protective cover 1. In particular, the membrane 2 is disposed on the second horizontal portion 36, so as to define a venting chamber 16 between the membrane 2, the first vertical portion 35 and the first horizontal portion 37 which communicates with the at least one first venting hole 11. The membrane 2 can be welded onto the second horizontal portion 36 or glued onto the second horizontal portion 36. As shall be understood for those skilled in the art, the membrane 2 can be disposed on the second horizontal portion 36 in any other suitable means, without departing the scope of the disclosure.
According to one example, the valve body 5 may include a hollow main body portion 52, a hollow cylindrical central portion 57 and a plurality of ribs extending radially between the main body portion 52 and the central portion 57. A plurality of relief holes 51 are formed between the plurality of ribs, the main body portion 52 and the central portion 57. The central portion 57 includes a cylindrical receiving hole 56 for receiving the base portion 33. According to one example, the main body portion 52 may include a cylindrical locking housing 58 extending from side wall of the main body portion 52 in a radially inward direction perpendicular to the longitudinal axis 30 of the explosion-proof venting valve 100 and defining a cylindrical locking cavity 53 aligned with the locking hole 34.
According to one example, the main body portion 52 is provided with threads on an outer surface thereof, so as to engage with corresponding threads on the battery pack. However, as shall be understood for those skilled in the art, the valve body 5 may utilize any other suitable types of connections, such as screw and screw hole, without departing the scope of the disclosure.
According to one example, top surface of the main body portion 52 flushes with top surface of the central portion 57. The main body portion 52 extends a first length downward along the longitudinal axis 30 of the explosion-proof venting valve 100, the central portion 57 extends a second length downward along the longitudinal axis 30 of the explosion-proof venting valve 100, the first length is larger than the second length, so as to leave space for the self-locking mechanism.
The valve body5may further include a flange portion 59 which extends upwards and outwards from the main body portion 52 and has an inner diameter larger than an inner diameter of the main body portion 52, so as to receive the cover seat3 on the main body portion 52. The flange portion 59 may be provided with a first circumferential sealing groove 55 on lower surface thereof, for receiving a first seal 19 configured to seal between the valve body 5 and the battery pack. The first seal 19 may be made of a flexible material like an ethylene propylene diene rubber (EPDM) , in particular a silicone rubber (VMQ) . The material of the first seal 19 can be injection-molded. An interior surface of the flange portion 59 or outer surface of the first vertical portion 35 is provided with a second circumferential sealing groove 20 for receiving a second seal 4 configured to seal between the valve body 5 and the first vertical portion 35. The second seal 4 may be made of a flexible material like an EPDM, in particular a VMQ. The material of the second seal 4 can be injection-molded.
The locking pin 8 and the biasing spring 7 are disposed in the cylindrical locking cavity 53. According to one example, the locking pin 8 may include a first end portion 81 slidably housed in the cylindrical locking cavity 53 and a second end portion 82 which can be received in the locking hole 34. The biasing spring 7 is disposed between the side wall of the main body portion 52 and the first end portion 81 of the locking pin 8 and is configured to bias the second end portion 82 of the locking pin 8 into the locking hole 34. According to one example, the first end portion 81 is a plug, the second end portion 82 has a smaller diameter than the first end portion 81 and can be received in the locking hole 34. However, the second end portion 82 can have the same diameter as the first end portion 81, without departing the scope of the disclosure. An interior surface of the cylindrical locking housing 58 or outer surface of the first end portion 81 is provided with a circumferential plug sealing groove 18 on outer surface thereof, the circumferential plug sealing groove 18 is configured to house a plug seal 9 configured to seal between the first end portion 81 and the cylindrical locking housing 58. The plug seal 9 may be made of a flexible material like an EPDM, in particular a VMQ. The material of the plug seal 9 can be injection-molded.
By means of the self-locking mechanism, the locking pin 8 is reliably positioned in the locking hole 34, thus ensuring the normal operation of the battery pack.
In addition, since the locking pin 8 extends perpendicular to the longitudinal axis 30 of the explosion-proof venting valve 100 and thus has little contact area with the gas flow in the battery pack, the gas flow has little influence on the locking pin, thus, the cost of the locking pin 8 is low and the reliability of the locking pin 8 is high. In addition, the biasing spring 7 can be small in size, thus saving the space of the explosion-proof venting valve 100.
The spring constant of the biasing spring 7 can be adjusted for different application scenarios and internal pressure emergency relief demands, thus exhibiting excellent scalability.
Fig. 6 is a schematic close-up view of an example configuration of the equilibrium hole 54 of the main body portion of the explosion-proof venting valve 100 according to embodiments. The main body portion 52 is provided with at least one equilibrium hole 54 extending through the side wall of the main body portion 52 and communicating between the cylindrical locking cavity 53 and exterior of the main body portion 52, so as to facilitate sliding movement of the locking pin 8 inside the cylindrical locking cavity 53.
By means of the equilibrium hole, the locking pin 8 can be reliably pushed away from the locking hole 34 and disengage from the locking hole 34 when the explosion-proof venting valve 100 is in the blasting state, thus protecting the battery pack and safety of passengers for emergencies. As shown in Fig. 6, at least one web 541 is disposed within at least one equilibrium hole 54 and integrated with the main body portion 52. There are two webs 541 arranged in cruciform, however, as shall be understood for those skilled in the art, the webs 541 may be formed in any other suitable form, such as pozidriv, without departing the scope of the disclosure. In addition, the number of the web 541c an also be selected as needed.
Now, the operation of the explosion-proof venting valve 100 is described. When the battery pack is under normal operation conditions, the biasing spring 7 biases the second end portion of the locking pin 8 into the locking hole 34 and the cover seat 3 seats against the central portion 57 and the main body portion 52 and thus blocks the plurality of relief holes 51.
When a pressure of the interior of the battery pack is less than environment pressure, the explosion-proof venting valve 100 is in a normal suction state, surrounding gas flows into the battery pack via the at least one first venting hole 11, the second venting hole 13, the third venting holes 31, the membrane 2, the venting chamber 16 and the seat venting passage 17. In particular, the gas flows through the at least one first venting hole 11, or through the second venting hole 13 and the third venting holes 31, then through the membrane 2, the venting chamber 16 and the seat venting passage 17, and thus flows into the battery pack, as shown in Fig. 2.
When the pressure of the interior of the battery pack is greater than the environment pressure but a pressure difference between interior and exterior of the battery pack is lower than a predetermined threshold that can overcome the biasing spring force of the biasing spring 7, the explosion-proof venting valve 100 is in a normal expiration state, gas within the battery pack will flow out of the battery pack via the at least one first venting hole 11, the second venting hole 13, the third venting holes 31, the membrane 2, the venting chamber 16 and the seat venting passage 17. In particular, the gas flows through the seat venting passage 17, the venting chamber 16 and the membrane 2, then exits the battery pack via the at least one first venting hole 11, or via the second venting hole 13 and the third venting holes 31, as shown in Fig. 3.
When the pressure of the interior of the battery pack is greater than the environment pressure and the pressure difference between interior and exterior of the battery pack increases above the predetermined threshold, the explosion-proof venting valve 100 is in a blasting state, the pressure difference overcomes the biasing force of the biasing spring 7, so as to urge the locking pin 8 away from the locking hole 34. The locking pin 8 slides away from the locking hole 34 along the cylindrical locking cavity 53 and disengages from the locking hole 34 (as shown in Fig. 4) , then the cover assembly 110 including the protective cover 1, the cover seat 3 and the membrane 2 bounces off from the valve body 5, and gas within the battery pack can be relieved to surrounding environment via the plurality of relief holes 51, as shown in Fig. 5.
By means of the self-locking mechanism, the locking pin 8 is reliably positioned in the locking hole 34, thus ensuring the normal operation of the battery pack.
Aspects of the present disclosure have been described in detail with reference to the illustrated embodiments; those skilled in the art will recognize, however, that many modifications may be made thereto without departing from the scope of the present disclosure. The present disclosure is not limited to the precise construction and compositions disclosed herein; any and all modifications, changes, and variations apparent from the foregoing descriptions are within the scope of the disclosure as defined by the appended claims. Moreover, the present concepts expressly include any and all combinations and subcombinations of the preceding elements and features.

Claims

An explosion-proof venting valve (100) for a battery pack, the explosion-proof venting valve (100) comprising:

a protective cover (1) comprising at least one first venting hole (11) ;

a cover seat (3) removably engaged with the protective cover (1) , the cover seat (3) comprising a locking hole (34) extending radially relative to a longitudinal axis (30) of the explosion-proof venting valve (100) ;

a membrane (2) that is water-impermeable and is gas-permeable, the membrane (2) being interposed between the cover seat (3) and the protective cover (1) ;

a valve body (5) comprising a hollow main body portion (52) , a hollow cylindrical central portion (57) , a plurality of ribs extending radially between the main body portion (52) and the central portion (57) , and a plurality of relief holes (51) interposed between the plurality of ribs, the main body portion (52) and the central portion (57) , the main body portion (52) comprising a cylindrical locking housing (58) extending from a side wall of the main body portion (52) in a radially inward direction perpendicular to the longitudinal axis (30) of the explosion-proof venting valve (100) , and the locking housing (58) defining a cylindrical locking cavity (53) aligned with the locking hole (34) ; and

a self-locking mechanism comprising a locking pin (8) and a biasing spring (7) , the locking pin (8) comprising a first end portion (81) slidably housed in the cylindrical locking cavity (53) and a second end portion (82) removably received in the locking hole (34) , and the biasing spring (7) being interposed between the side wall of the main body portion (52) and the first end portion (81) of the locking pin (8) and being configured to bias the second end portion (82) of the locking pin (8) into the locking hole (34) .
The explosion-proof venting valve (100) according to claim 1, wherein the cover seat (3) further comprises a hollow cylindrical base portion (33) , a first horizontal portion (37) extending radially outwards from the base portion (33) , a cylindrical first vertical portion (35) extending upwards around the first horizontal portion (37) , a second horizontal portion (36) extending radially outwards from the first vertical portion (35) , and a cylindrical second vertical portion (38) extending upwards around the second horizontal portion (36) , the base portion (33) defining a seat venting passage (17) , and

the locking hole (34) extends radially through a side wall of the base portion (33) .
The explosion-proof venting valve (100) according to claim 2, wherein the protective cover (1) further comprises a top wall through which the at least one first venting hole (11) is comprised, and a plurality of first locking members (12) disposed circumferentially around the top wall, and

the cover seat (3) further comprises a plurality of second locking members (32) aligned circumferentially with the plurality of first locking members (12) .
The explosion-proof venting valve (100) according to claim 3, wherein the plurality of first locking members (12) are snap lugs extending downwards from the top wall, each of the snap lugs defining a second venting hole (13) ,

the plurality of second locking members (32) are protrusions, each of the protrusions comprising a third venting hole (31) extending through a respective one of the protrusions and the second vertical portion (38) and being in communication with the second venting hole (13) of a respective one of the snap lugs, and

the snap lugs are removably snapped over the protrusions, to fix the protective cover (1) to the cover seat (3) .
The explosion-proof venting valve (100) according to claim 4, wherein the membrane (2) is disposed on the second horizontal portion (36) , to define a venting chamber (16) between the membrane (2) , the first vertical portion (35) and the first horizontal portion (37) the venting chamber (16) communicating with the at least one first venting hole (11) .
The explosion-proof venting valve (100) according to claim 1, wherein the main body portion (52) comprises threads on an outer surface thereof, the threads being configured to engage with corresponding threads on the battery pack.
The explosion-proof venting valve (100) according to claim 2, wherein the valve body (5) further comprises a flange portion (59) extending upwards and outwards from the main body portion (52) and having an inner diameter larger than an inner diameter of the main body portion (52) so that the flange portion (59) is configured to receive the cover seat (3) on the main body portion (52) , a lower surface of the flange portion (59) comprising a first circumferential sealing groove configured to receive a first seal (19) configured to seal between the valve body (5) and the battery pack.
The explosion-proof venting valve (100) according to claim 7, wherein an interior surface of the flange portion (59) or an outer surface of the first vertical portion (35) comprises a second circumferential sealing groove (20) configured to receive a second seal (4) configured to seal between the valve body (5) and the first vertical portion (35) .
The explosion-proof venting valve (100) according to claim 1, wherein the first end portion (81) is a plug, and

the second end portion (82) has a diameter smaller than a diameter of the first end portion (81) .
The explosion-proof venting valve (100) according to claim 1, wherein an interior surface of the locking housing (58) or an outer surface of the first end portion (81) comprises a circumferential plug sealing groove (18) configured to receive a plug seal (9) configured to seal between the first end portion (81) and the locking housing (58) .
The explosion-proof venting valve (100) according to claim 1, wherein a top surface of the main body portion (52) flushes with a top surface of the central portion (57) ,

the main body portion (52) extends a first length downward along the longitudinal axis (30) of the explosion-proof venting valve (100) ,

the central portion (57) extends a second length downward along the longitudinal axis (30) of the explosion-proof venting valve (100) , and

the first length is larger than the second length.
The explosion-proof venting valve (100) according to claim 1, wherein the central portion (57) comprises a cylindrical receiving hole (56) configured to receive the base portion (33) ,

wherein the biasing spring (7) is configured to bias the second end portion (82) into the locking hole (34) and the cover seat (3) is configured to sit against the central portion (57) and the main body portion (52) and thus block the plurality of relief holes (51) , when the battery pack is under normal operation conditions, and

the biasing spring (7) is configured to move so that the second end portion (82) disengages away from the locking hole (34) , the cover seat (3) and the protective cover (1) bounce off from the valve body (5) , and gas within the battery pack is relieved to an environment via the plurality of relief holes (51) , when a pressure of an interior of the battery pack is greater than a pressure of the environment and a pressure difference between the interior and an exterior of the battery pack increases above a predetermined threshold.
The explosion-proof venting valve (100) according to claim 1, wherein the main body portion (52) comprises at least one equilibrium hole (54) extending through the side wall of the main body portion (52) and communicating between the cylindrical locking cavity (53) and an exterior of the main body portion (52) , the at least one equilibrium hole (54) facilitating a sliding movement of the locking pin (8) inside the cylindrical locking cavity (53) .
The explosion-proof venting valve (100) according to claim 13, wherein the at least one equilibrium hole (54) comprises at least one web (541) disposed within the at least one equilibrium hole (54) and integrated with the main body portion (52) .