Vent valve with leak check and thermal runaway relief

Abstract

A vent valve assembly can be operated in a passive venting mode, a leak check mode, and an emergency venting mode. The vent valve assembly is automatically transitioned from the passive venting mode to the emergency venting mode during a pressure spike. The vent valve assembly is manipulatable to be transitioned from the passive venting mode to a leak check mode using an actuator. The actuator may be manipulated from an exterior of the vent valve assembly.

Description

VENT VALVE WITH LEAK CHECK AND THERMAL RUNAWAY RELIEFCROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Indian Provisional Application Nos. 202311078580, filed November 20, 2023, and 202411026973, filed April 1, 2024, the disclosures of which are incorporated by reference in their entireties.BACKGROUND

[0002] An enclosure, such as a battery case enclosing a battery, may have a need to passively vent various gasses over the lifetime of the battery. Current battery ventilation modules may use a custom over molded seal and seat within the device. Additionally, a battery case may be subject to an overpressure scenario in which the battery causes the pressure in the battery case to rise above a safe level, which may result in damage to or rupture of the battery case. Further, during an overpressure scenario, relief fluids may come into contact with a membrane or element which facilitates the ventilation; the composition of the relief fluids may be damaging to the materials of the membrane.

[0003] The enclosure may need to be checked for leaks after or during manufacture. Current enclosures have a through hole which is used to perform an end of line leak check at the end of the manufacturing process of the enclosures. After the end of line leak check is performed, a passive vent is installed into the through hole of the enclosure. The through hole where this passive vent is installed cannot be leak checked. Instead, performing another leak check on the enclosure either would require the creation of another through hole or would add an additional step (for example, removing the passive vent, performing the leak check, and then reinstalling the passive vent after the leak check).

[0004] A device which can provide a way to ventilate the battery case, provide for pressure relief, provide for leak checking, and / or protect the membrane from relief fluids during pressure relief may be beneficial.SUMMARY

[0005] Aspects of the disclosure are directed to a vent valve assembly and methods of use thereof.

[0006] In accordance with some aspects of the disclosure, the vent valve assembly can be operated in a passive venting mode, a leak check mode, and an emergency venting mode. The vent valve assembly is automatically transitioned from the passive venting mode to theemergency venting mode during a pressure spike. The vent valve assembly is manipulatable to be transitioned from the passive venting mode to a leak check mode using an actuator. The actuator may be manipulated from an exterior of the vent valve assembly.

[0007] In accordance with certain aspects of the disclosure, a vent valve assembly includes: a body defining a valve seat; an end cap closing the body; a poppet configured to move relative to the valve seat between a closed position and an open position; a biasing member biasing the poppet to the closed position; and a leak check actuator. The leak check actuator is actuatable from the exterior of the vent valve assembly to move the poppet from the closed position to the open position.

[0008] In some implementations, the leak check actuator transitions the poppet between open and closed positions by being rotated relative to the poppet. In other implementations, the leak check actuator transitions the poppet between open and closed positions by rotating the poppet.

[0009] In certain implementations, the poppet includes ramped surfaces that cam the poppet to the open position during rotation of a portion of the leak check fixture. In some examples, the poppet cams over the leak check actuators that rotate with the fixture. In other examples, the poppet cams over the vent valve body when rotated with the fixture.

[0010] In certain implementations, the actuator extends from the poppet, through the end cap, to an exterior of the vent valve assembly.

[0011] In certain implementations, the vent valve assembly further includes a membrane disposed within the body. In some examples, the membrane forms a disc. In other examples, the membrane forms a ring.

[0012] In accordance with certain aspects of the disclosure, a method of operating a vent valve assembly includes: passively venting an enclosure along a first flow path from an inlet of a vent valve assembly to an outlet of the vent valve assembly; and manipulating an actuator to move a poppet of the vent valve assembly away from the inlet to open a second flow path to perform a leak check.

[0013] In some implementations, manipulating the actuator comprises pulling the actuator. In other implementations, manipulating the actuator comprises twisting the actuator. In other implementations, manipulating the actuator comprises rotating the actuator about an axis of the vent valve assembly.

[0014] In certain implementations, the method also includes moving the poppet away from the inlet to open the second flow path during a pressure spike at the inlet.

[0015] A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and to combinations of features. It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the description, illustrate several aspects of the present disclosure. A brief description of the drawings is as follows:

[0017] FIG. 1 is a first perspective view of a first example vent valve assembly suitable for use with a battery pack or other enclosure;

[0018] FIG. 2 is a second perspective view of the vent valve assembly of FIG. 1;

[0019] FIG. 3 is an exploded view of the vent valve assembly of FIG. 1;

[0020] FIG. 4 is a cross-sectional view of the vent valve assembly of FIG. 1 shown in a passive venting mode;

[0021] FIG. 5 is a cross-sectional view of the vent valve assembly of FIG. 1 shown in a leak check mode;

[0022] FIG. 6 shows the vent valve assembly of FIG. 5 with a different example actuator;

[0023] FIG. 7 is a cross-sectional view of the vent valve assembly of FIG. 1 shown in an emergency venting mode;

[0024] FIG. 8 is a first perspective view of a second example vent valve assembly suitable for use with a battery pack or other enclosure;

[0025] FIG. 9 is a second perspective view of the vent valve assembly of FIG. 8;

[0026] FIG. 10 is an exploded view of the vent valve assembly of FIG. 8;

[0027] FIG. 11 is a perspective view of an example implementation of a body suitable for use with the vent valve assembly of FIG. 8;

[0028] FIG. 12 is a perspective view of an example implementation of a poppet suitable for use with the vent valve assembly of FIG. 8;

[0029] FIG. 13 is a cross-sectional view of the vent valve assembly of FIG. 8 shown in a passive venting mode;

[0030] FIG. 14 is a cross-sectional view of the vent valve assembly of FIG. 8 shown in a leak check mode;

[0031] FIG. 15 is a cross-sectional view of the vent valve assembly of FIG. 8 shown in an emergency venting mode;

[0032] FIG. 16 is a perspective view of another example vent valve assembly configured in accordance with the principles of the present disclosure;

[0033] FIG. 17 is an exploded view of the vent valve assembly of FIG. 16;

[0034] FIG. 18 is a perspective cross-sectional view of the vent valve assembly of FIG.16;

[0035] FIG. 19 is a perspective view of an example leak check fixture suitable for use in implementing a leak check of an enclosure using the vent valve assembly of FIG. 16;

[0036] FIG. 20 is an exploded view of the leak check fixture of FIG. 19;

[0037] FIG. 21 is a bottom perspective view of the leak check fixture of FIG. 19 with an interface body disposed in a de-actuated configuration;

[0038] FIG. 22 is a bottom plan view of the leak check fixture of FIG. 19 with the interface body disposed in the de-actuated configuration;

[0039] FIG. 23 is a perspective cross-sectional view of the leak check fixture of FIG. 19 mounted over the vent valve assembly of FIG. 16 and disposed in the de-actuated configuration so that the poppet of the vent valve assembly is closed;

[0040] FIG. 24 is a bottom perspective view of the leak check fixture of FIG. 19 with an interface body disposed in an actuated configuration;

[0041] FIG. 25 is a bottom plan view of the leak check fixture of FIG. 19 with an interface body disposed in the actuated configuration;

[0042] FIG. 26 is a perspective cross-sectional view of the leak check fixture of FIG. 19 mounted over the vent valve assembly of FIG. 16 and disposed in the actuated configuration so that the poppet of the vent valve assembly is open;

[0043] FIG. 27 is a perspective cross-sectional view of FIG. 20;

[0044] FIG. 28 shows another cross-sectional view of the leak check fixture of FIG. 19;

[0045] FIG. 29 is a perspective view of another example vent valve assembly configured in accordance with the principles of the present disclosure;

[0046] FIG. 30 is an exploded view of the vent valve assembly of FIG. 29;

[0047] FIG. 31 is a perspective cross-sectional view of a body of the vent valve assembly of FIG. 29;

[0048] FIG. 32 is a perspective cross-sectional view of the vent valve assembly of FIG. 29 with the poppet shown in the closed position;

[0049] FIG. 33 is a perspective view of the vent valve assembly of FIG. 29 along with a leak check actuator when the poppet is disposed in the closed position;

[0050] FIG. 34 is a perspective view of the vent valve assembly of FIG. 29 along with the leak check actuator when the poppet is disposed in the open position;

[0051] FIG. 35 is a perspective view of an example leak check fixture suitable for use in implementing a leak check of an enclosure using the vent valve assembly of FIG. 29;

[0052] FIG. 36 is a perspective view of a cross-section taken through the leak check fixture of FIG. 35 and vent valve assembly of FIG. 29 so that the leak check actuator is visible;

[0053] FIG. 37 is a perspective cross-sectional view of the leak check fixture of FIG. 35 mounted over the vent valve assembly of FIG. 29 and disposed in the actuated configuration so that the poppet of the vent valve assembly is open;

[0054] FIG. 38 is a cross-sectional view of the leak check fixture of FIG. 35 mounted over the vent valve assembly of FIG. 29 and disposed in the actuated configuration so that the poppet of the vent valve assembly is open;

[0055] FIG. 39 is a flow chart illustrating an example leak check process for an enclosure with at least one vent valve assembly; and

[0056] FIG. 40 is a graph showing a comparison of the pressure decay between a charged vent valve assembly with a properly seated poppet and one with an improperly (and hence unsealed) poppet.DETAILED DESCRIPTION

[0057] Reference will now be made in detail to exemplary aspects of the present disclosure that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0058] Referring to the figures in general, a vent valve assembly 100, 200, 300, 400 is suitable for use to vent an interior of an enclosure E (see FIG. 4), such as a battery for an electric vehicle. The vent valve assembly 100, 200, 300, 400 is configured to be installed at the enclosure E so that at least a portion of the vent valve assembly 100, 200, 300, 400 extends into the enclosure E. In certain implementations, the vent valve assembly 100, 200, 300, 400 is configured to provide passive venting of the enclosure E through a membrane 120, 220, 320, 420 (e.g., a hydrophobic membrane). In certain implementations, the vent valve assembly 100, 200, 300, 400 is configured to provide emergency pressure venting (e.g., thermal runaway relief). In certain implementations, the vent valve assembly 100, 200, 300, 400 is configured to provide leak check functionality for the enclosure after being mounted to the enclosure E.In certain implementations, the vent valve assembly 100, 200, 300, 400 is configured to provide a combination of two or more of passive venting, emergency venting, and / or leak check functionality.

[0059] The vent valve assembly 100, 200, 300, 400 includes a body 102, 202, 302, 402 and a cap 104, 204, 304, 404. The body 102, 202, 302 is configured to attach to the enclosure E. For example, the body 102, 202, 302, 402 may include a bayonet retainer 116, 216, 416, a thread, a latch, a fastener flange 316, or another such retainer to secure to the enclosure E. The body 102, 202, 302, 402 also carries a seal 118, 218, 318, 418 to press against the enclosure E to further seal the vent valve assembly 100, 200, 300, 400 to the enclosure E (e.g., see FIGS. 4, 18, and 32).

[0060] The body 102, 202, 302, 402 defines an input port 106, 206, 306, 406 at which fluid (e.g., gas) from the enclosure E enters the vent valve assembly 100, 200, 300, 400. In certain examples, the input port 106, 206, 306, 406 is disposed within the enclosure E. In certain examples, a flame arrestor 309, 409 extends across the input port 306, 406 (e.g., see FIGS. 18 and 36). In some implementations, the membrane 120, 220 is disposed at the input port 106, 206 to cover or extend across at least a portion of the input port 106, 206. In other implementations, the membrane 320, 420 is offset into the body 302, 402 from the input port 306, 406. In certain examples, the membrane 120, 220, 320, 420 is hydrophobic. In some examples, the membrane 120, 220, 320, 420 is ring-shaped (e.g., see FIG. 3). In other examples, the membrane 120, 220, 320, 420 is disc-shaped (e.g., see FIG. 10). In still other examples, the membrane 120, 220, 320, 420 can have any desired shape (e.g., oval, rectangular, triangular, tubular, etc.).

[0061] The cap 104, 204, 304, 404 mounts to the body 102, 202, 302, 402 at an exterior of the enclosure E. In some examples, the cap 104 mounts to an exterior of the body 102 (e.g., see FIG. 1). In other examples, the cap 204, 304, 404 mounts within the body 202, 302, 402 (e.g., see FIGS. 8, 18, and 32). In certain examples, the cap 104, 204, 304, 404 is latched to the body 102, 202, 302, 402. For example, the body 102, 202, 302, 402 may define hooks or teeth 112, 212 and the cap 104, 204, 304, 404 may define windows or other catch surfaces. In another example, the body 102, 202, 302, 402 may define the catch surface and the cap 104, 204, 304, 404 may define the latch 312, 412. The cap 104, 204, 304, 404 and the body 102, 202, 302, 402 cooperate to define one or more outlet ports 108, 208, 308, 408 through which fluid from the enclosure E may leave the vent valve assembly 100, 200, 300, 400 to the atmosphere. In some examples, the cap 104, 204, 304, 404 defines multiple windows arounda circumference of the cap 104, 204, 304, 404 to define the outlet ports 108, 208. In other examples, the body 102, 202, 302, 402 defines the windows forming the outlet ports 308, 408.

[0062] In certain implementations, the vent valve assembly 100, 200, 300, 400 includes a poppet 122, 222, 322, 422 disposed within an interior defined between the body 102, 202, 302, 402 and the cap 104, 204, 304, 404. The poppet 122, 222, 322, 422 is movable along an axis A between a closed position and an open position relative to a valve seat 125, 225, 325, 425 defined within the body 102, 202, 302, 402. When the poppet 122, 222, 322, 422 is disposed in the closed position, the poppet 122, 222, 322, 422 seals to the valve seat 125, 225, 325, 425 using a seal 124, 224, 324, 424. In some examples, the poppet 122, 222, 322 carries the seal 124, 224, 324 (e.g., see FIGS. 5, 14, and 28). In other examples, the seal 124, 224, 324, 424 is fixedly mounted to the valve seat 125, 225, 325, 425 (e.g., see FIG. 32). When the poppet 122, 222, 322, 422 is disposed in the open position, the poppet is spaced from the valve seat 125, 225, 325, 425, thereby opening a second flow path FP2 (e.g., see FIGS. 6, 14, 28, and 37).

[0063] In some implementations, the valve seat 125, 325, 425 includes a surface surrounding a passage 107, 307, 407 through the body 102, 302, 402 leading to the inlet port 106, 306, 406 (e.g., see FIG. 4). In such examples, the seal 124, 324, 424 includes a ringshaped seal that either seats on or opposes the surface. In other implementations, the valve seat 225 includes a first surface 225a at an outer boundary of an annular passage 207 and a second surface 225b at an inner boundary of the annular passage 207 (e.g., see FIG. 11). During a leak check operation, test fluid flows past the poppet 122, 222, 322, 422 and along the passage 107, 207, 307, 407 to the inlet 106, 206, 306, 406 and into the enclosure E as will be described in more detail herein (e.g., see FIG. 14, 28, and 37). During a pressure spike in the enclosure E, escaping fluid flows into the inlet 106, 206, 306, 406 and along the passage 107, 207, 307, 407 to the poppet 122, 222, 322, 422 as will be described in more detail herein (e.g., see FIG. 15).

[0064] In certain implementations, the poppet 122, 222, 322, 422 is biased to the closed position by a biasing member 130, 230, 330, 430 (e.g., a coil spring). In certain examples, the poppet 122, 222, 322, 422 defines a first abutment surface 126, 226, 326, 426 configured to receive one end of the biasing member 130, 230, 330, 430. In an example, the first abutment surface 126, 226, 326, 426 is recessed downwardly into the poppet, 122, 222, 322, 422. In certain examples, the end cap 104, 204, 304, 404 defines a second abutment surface 132, 232, 332, 432 configured to receive the opposite end of the biasing member 130, 230, 330, 430. In an example, the second abutment surface 132, 232, 332, 432 is recessed upwardly into an interior of the end cap 104, 204, 304, 404.

[0065] In certain implementations, the poppet 122, 222, 322, 422 defines one or more openings 123, 223, 323, 423 (e.g., grooves, notches, or holes) that align with the membrane 120, 220, 320, 420 when the poppet 122, 222, 322, 422 is disposed at the body 102, 202, 302, 402. In some implementations, the openings 123 include grooves or notches disposed at a circumferential exterior of the poppet 122 (e.g., see FIG. 3). In such implementations, the openings 123 can align with a ring-shaped membrane 120 held by the body 102 (e.g., see FIG. 4). In other implementations, the openings 223, 323, 423 include apertures through a bottom of the poppet 222, 322, 422 (e.g., see FIGS. 12, 18, and 32). In such implementations, the openings 223, 323, 423 can align with a disc-shaped membrane 220, 320, 420 held by the body 202, 302, 402 (e.g., see FIG. 17) or by the poppet 222, 322, 422 (e.g., see FIG. 13). Accordingly, fluid from the enclosure E can exit the enclosure E along a vent flow path FP1 through the membrane 120, 220, 320, 420, into the vent valve assembly 100, 200, 300, 400, past the poppet 122, 222, 322, 422, and out of the windows 108, 208, 308, 408 (e.g., see FIGS. 4, 13, 18, and 32).

[0066] In accordance with certain aspects of the disclosure, the vent valve assembly 100, 200, 300, 400 is configured to facilitate conducting a leak check of the enclosure E through the vent valve assembly 100, 200, 300, 400. In certain implementations, a fixture F is sealingly mounted over the vent valve assembly 100, 200, 300, 400 to supply fluid (e.g., air) to or draw a vacuum from the enclosure E through the vent valve assembly 100, 200, 300, 400. In certain examples, the poppet 122, 222, 322, 422 is moved away from the inlet port 106, 206, 306, 406 and towards the cap 104, 204, 304, 404 to open the second fluid pathway FP2. The fluid from the fixture passes along the second fluid pathway FP2 as the poppet 122, 222, 322, 422 is maintained in the open position during the leak check.

[0067] In certain implementations, the poppet 122, 222, 322 includes an actuator interface 128, 228, 328, 428 that engages a leak check actuator 110, 210, 310, 410. In some implementations, the leak check actuator 110, 210, 410 is configured to extend from the poppet 122, 222, 422, through an aperture 105, 205, 405 defined in the end cap 104, 204, 404, to an exterior of the vent valve assembly 100, 200, 400 (e.g., see FIGS. 7, 10, 36). In other implementations, the leak check actuator 310 selectively extends through a sidewall of the body 302 to reach the poppet 322 (e.g., see FIG. 28). Accordingly, a user can manipulate the actuator 110, 210, 310, 410 at an exterior of the vent valve assembly 100, 200, 300, 400 to change the position of the poppet 122, 222, 322, 422. For example, the actuator 110, 210, 310, 410 can be used to selectively move the poppet 122, 222, 322, 422 to the open and closed positions. In some examples, the leak check actuator 110, 210, 410 is configured to be manipulated by theleak check fixture F. In other examples, the leak check actuator 310 forms part of the leak check fixture F, 500, 600 (e.g., see FIGS. 19-28).

[0068] When the actuator 110, 210, 310, 410 moves the poppet 122, 222, 322, 422 to the open position, a test fluid (e.g., gas) can be introduced into the vent valve assembly 100, 200, 300, 400 along the second flow path FP2 (e.g., see FIGS. 5, 14, 28, and 37). For example, a leak check fixture F can be sealingly mounted over the vent valve assembly 100, 200, 300, 400 to introduce the test fluid into the vent valve assembly 100, 200, 300, 400 through the windows 108, 208, 308, 408, along the second flow path FP2 between the poppet 122, 222, 322, 422 and the valve seat 125, 225, 325, 425, and out of the body port 106, 206, 306, 406 and into the enclosure E. In certain examples, some test fluid also can flow along the first flow path FP1 through the membrane 120, 220, 320, 420 during the leak check.

[0069] In some implementations, the actuator 110, 210, 310, 410 is actuated by twisting movement. For example, in certain cases, the actuator 110, 210 includes a threaded rod and the actuator interface 128, 228 includes a threaded socket so that twisting the actuator 110, 210 causes the poppet 122, 222 to ride along a length of the rod. In certain examples, the poppet 122, 222 defines a cavity 129, 229 configured to accommodate a portion of the actuator 110, 210 when the poppet 122, 222 is disposed in at least the open position (e.g., see FIGS. 5 and 14). In another example, the poppet 122, 222 may define the threaded rod and the actuator 110, 210 may define a threaded socket. In other examples, a twisting movement of a portion of the fixture F may raise the poppet 322, 422 via the actuator 310, 410 as will be discussed in more detail herein.

[0070] In other implementations, the actuator 110, 210 is actuated by a pulling movement. For example, the actuator 110, 210 includes a spring-biased ball plunger and the actuator interface 128, 228 includes one or more catch surfaces. In the example shown in FIG. 6, the actuator 110 includes a rod defining a first diameter surface at one location along the length of the rod and a second diameter surface at another location spaced along the length of the rod. The second diameter surface is smaller than the first diameter surface. One or more balls or other structures are disposed adjacent the rod. When the rod is biased to a first position, the balls oppose the first diameter surface and are pressed against the catch surfaces 128. When the rod is pulled or otherwise moved to a second position, the balls oppose the second diameter surface, which allows the balls to move radially inwardly away from the catch surfaces 128.

[0071] Referring now to FIGS. 16-38, the poppet 322, 422 of the vent valve assembly 300, 400 are configured with ramped surfaces 340, 440 to assist in moving the poppet 322, 422 between the open and closed positions. In certain implementations, the poppet 322, 422 isrotated to open the poppet 322, 422 using the ramps 340, 440 as will be discussed in more detail herein. In the example shown in FIGS. 16-28, the ramped surfaces 340 form the actuator interface 328 of the poppet 322 with which the leak check actuator 310 interacts. In the example shown in FIGS. 29-38, the ramped surfaces 440 interact with the body 402 to open the poppet 422 when the actuator 410 moves the poppet 422 via the actuator interface 428.

[0072] Referring to FIGS. 16-28, the body 302 of the vent valve assembly 300 defines windows 308 leading to an interior. A membrane 320 is disposed at a raised platform within the body 302. The platform is supported by legs 311. The poppet 322 fits over the platform so that a perforated or otherwise broken surface extends over the membrane 320. The poppet 322 rests on the valve seat 325 in a sealing configuration when disposed in the closed position. The poppet 322 is biased to the closed position by the biasing member 330. Ramped surfaces 340 extend radially outwardly from a sidewall of the poppet 322. The ramped surfaces 340 are accessible through the windows 308 in the body 302 (e.g., see FIG. 16). In certain examples, the ramped surfaces 340 circumferentially spaced along an exterior of the poppet 322 either in parallel with each other or curving in a common orientation.

[0073] In certain implementations, the fixture F is configured to operate the leak check actuator 310 to cam under the ramped surfaces 340 to move (e.g., raise) the poppet 322 to the open position against the bias of the biasing member 330. An example implementation 500 of a suitable fixture F is shown in FIGS. 19-28. The fixture 500 includes a main body 502 having a conduit interface 504 at which the fixture 500 is connected to either a fluid source or a vacuum source. The fixture 500 also includes an interface body 506 by which a user manipulates the leak check actuator 310 during a leak check. The interface body 506 can be arranged either in a de-actuated configuration, in which the poppet 322 is allowed to be biased to the closed position, or in an actuated configuration, in which the poppet 322 is held against the bias in an open position.

[0074] In certain implementations, the interface body 506 carries one or more mounting stations 508 for the leak check actuator 310. The leak check actuator 310 is carried by the interface body 506 between the de-actuated configuration and the actuated configuration. When the interface body 506 is disposed in the de-actuated configuration, the leak check actuator 310 is spaced from the ramped surface 340 and the poppet 322 is disposed in the closed position. When the interface body 506 is disposed in the actuated configuration, the leak check actuator 310 contacts and supports the ramped surface 340, thereby holding the poppet 322 in the open position.

[0075] In certain implementations, the main body 502 defines an opening 510 leading to interior. The interface body 506 is rotatably mounted at the opening 510 so that the interface body 506 extends into the interior. For example, one or more actuating walls 512 of the interface body 506 extend into the interior and define the mounting stations 508. In certain examples, each mounting station 508 includes an aperture defined through one of the actuating walls 512. In certain implementations, the leak check actuator 310 includes a pin or peg aligned with and partially extending through a respective one of the mounting stations 508. A biasing member 516 (e.g., a coil spring) biases the leak check actuator 310 outwardly from the interface body 506.

[0076] An end of the leak check actuator 310 rides along a contoured surface 514 within the main body 502 of the fixture 500. As the interface body 506 is rotated relative to the main body 502 between the actuated and de-actuated configurations, the leak check actuator 310 is moved through the mounting aperture 508 to vary the amount of the pin or peg extending inwardly from the interface body 506 (e.g., compare FIGS. 22 and 25). In certain examples, the contoured surface 514 extends between a first stop 514A and a second stop 514B. The contoured surface 514 is structured so that the leak check actuator 310 is spaced from the poppet 322 when disposed at the first stop 514A (e.g., see FIGS. 22 and 23). The pin or peg 310 cams under the ramped surfaces 340 as the pin or peg 310 rides over the contoured surface 514 towards the second stop 514B. The pin or peg 310 raises the poppet 322 as it cams under the ramped surface 340 (e.g., see FIGS. 25 and 26).

[0077] In certain examples, the interface body 506 is transitioned between the de-actuated and actuated configurations by turning or otherwise moving the interface body 506 relative to the main body 502. In certain implementations, the interface body 506 is mounted to the main body 502 so as to limit rotational travel of the interface body 506. In certain examples, the interface body 506 and main body 502 include a tab and slot arrangement that limits rotational movement of the interface body 506. In the example shown, the main body 502 includes tabs 518 that extend inwardly into the opening 510 (e.g., see FIGS. 20 and 27) and the interface body 506 defines slots 520 each extending partially around a circumference of the interface body 506 (e.g., see FIG. 28). Each tab 518 is configured to fit into one of the slots 520 and move therein. The slots 520 are sized to enable the interface body 506 to move between the actuated and de-actuated positions.

[0078] Referring to FIGS. 29-38, the body 402 of the vent valve assembly 400 defines windows 408 leading to an interior. A membrane 420 is disposed at a raised platform 415 within the body 402. The platform 415 is supported by legs 411, 413 (e.g., see FIG. 31). Thepoppet 422 fits over the platform 415 so that a perforated or otherwise broken surface extends over the membrane 420 (e.g., see FIG. 32). The poppet 422 rests on the valve seat 425 in a sealing configuration when disposed in the closed position. The poppet 422 is biased to the closed position by the biasing member 430. In certain implementations, the actuator interface 428 is disposed at an exterior of the poppet 422 (e.g., see FIG. 30). For example, the actuator interface 428 may be disposed at an outer periphery of the poppet 422.

[0079] In certain implementations, the poppet 422 is configured to cam over the body 402 (e.g., the platform 415) when transitioning between open and closed positions. In some implementations, as shown in FIG. 30, one or more ramped surfaces 440 extend outwardly (e.g., downwardly) from the poppet 422. Each ramped surface 440 extends from a base end 440 A to a tip 440B. In certain examples, the ramped surfaces 440 are spaced in a ring along a bottom of the poppet 422. The ramped surfaces 440 extend towards the legs 411, 413 of the platform 415. As the poppet 422 rotates relative to the valve body 402, the ramped surfaces 440 cam over support surfaces of the legs 411, 413, thereby raising and lowering the poppet 422.

[0080] In some implementations, some of the legs 411 of the platform 415 have support surfaces located closer to the membrane 420 than others of the legs 413. When the poppet 422 is disposed in a first rotational position, the legs 411 having support surfaces farther from the membrane 420 support the ramped surfaces 440, thereby allowing the poppet 422 to rest on the valve seat 425 in the closed position (e.g., see FIG. 32). When the poppet 422 is disposed in a second rotational position, the legs 413 having support surfaces closer to the membrane 420 support the ramped surfaces 440, thereby holding the poppet 422 in the open position (e.g., see FIG. 37). In other implementations, however, the platform 415 or other portion of the body 402 can define the ramped surfaces while the poppet 422 defines cam followers that cam over the ramped surfaces when the poppet 422 is rotated.

[0081] In certain implementations, the fixture F, 600 is configured to operate the leak check actuator 410 rotate the poppet 422, thereby camming the poppet 422 to the open position against the bias of the biasing member 430. An example implementation 600 of a suitable fixture F is shown in FIGS. 35-38. The fixture 600 includes a main body 602 having a conduit interface 604 at which the fixture 500 is connected to either a fluid source or a vacuum source. The fixture 600 also includes an interface body 606 by which a user manipulates the leak check actuator 410 during a leak check. The interface body 606 can be arranged either in a deactuated configuration, in which the poppet 422 is allowed to be biased to the closed position,or in an actuated configuration, in which the poppet 422 is held against the bias in an open position.

[0082] In certain implementations, the leak check actuator 410 includes a pin or peg that extends from the interface body 606, through an aperture 405 defined in the end cap 404 of the valve assembly 400, to the actuator interface 428 of the poppet 422 (e.g., see FIG. 36). In an example, the actuator interface 428 attaches to the interface body 606 so as to move in unison with the interface body 606 as the interface body 606 rotates relative to the main fixture body 602. The actuator interface 428 couples to the poppet 422 so as to transfer rotational movement of the fixture interface body 606 to the poppet 422. In an example, the actuator interface 428 includes a groove either recessed into a periphery of the poppet 422 or defined between radial protrusions at the periphery of the poppet 422 (e.g., see FIG. 36).

[0083] In certain implementations, the valve assembly 400 is configured to limit the rotational movement of the poppet 422 relative to the main body 402. For example, the cap 404 of the valve assembly 400 may define a curved slot 405 through which the actuator interface 428 can extend. As the fixture interface body 606 is rotated, the interface body 606 moves the actuator interface 428 along the slot 405 between opposite ends of the slot 405 (e.g., compare FIGS. 33 and 34). The length of the slot 405 limits the travel of the actuator interface 428, thereby limiting the rotation of the poppet 422.

[0084] In certain implementations, the interface body 506, 606 can be moved between the actuated and de-actuated configurations to transition the valve assembly 100, 200, 300, 400. In certain examples, the positions of the interface body 506, 606 are labeled on the fixture F, 500. For example, the interface body 506, 606 may include a marker M that points to or otherwise indicates a locked symbol L when disposed in the de-actuated position and points to or otherwise indicates an unlocked symbol U when disposed in the actuated position (e.g., see FIG. 19). In some examples, the interface body 506, 606 can be releasably locked at one or both of the actuated and de-actuated configurations. In other examples, the interface body 506, 606 encounters a noticeable, but surmountable resistance against further movement upon reaching one or both of the actuated and de-actuated configurations.

[0085] In some implementations, the interface body 506, 606 can be manually moved between the actuated and de-actuated configurations by a user. For example, a user may grasp and rotate the interface body 506, 606 relative to the main body 502, 602. In another example, the interface body 506, 606 may define a tool interface 522, 622 at which a tool (e.g., a driver) can be fitted to rotate the interface body 506, 606 relative to the main body 502, 602. In other implementations, the tool may be computer-controlled and may apply a torque as determinedby a control system. In certain examples, the control system applies a predetermined amount of torque sufficient to move the interface body 506, 606 between the actuated and de-actuated configurations.

[0086] In certain implementations, the vent valve assembly 100, 200, 300, 400 also is configured to provide emergency venting during a pressure spike within the enclosure E (e.g., through thermal runaway). For example, the bias of the biasing member 130, 230, 330, 430 can be set to allow the bias on the poppet 122, 222, 322, 422 to be countered by a sufficiently high pressure of fluid escaping from the enclosure E. In such cases, the escaping fluid may press the poppet 122, 222, 322, 422 against the bias of the biasing member 130, 230, 330, 430 to the open position, thereby opening the second flow path FP2 without the use of the actuator 110, 210, 310, 410. The escaping fluid then flows between the poppet 122, 222, 322, 422 and the valve seat 125, 225, 325, 425 along the second flow path FP2 to the windows 108, 208, 308, 408 and out of the vent valve assembly 100, 200, 300, 400.

[0087] In certain implementations, a position of the actuator 110, 210 relative to the actuator interface 128, 228 does not change between a venting operation and an emergency venting operation. In certain examples, the actuator 110, 210 is carried by the poppet 122, 222 to the open position during emergency venting. For example, in FIGS. 7 and 16, the actuator 110, 210 has not entered the cavity 129, 229 defined by the poppet 122, 222. Instead, a larger portion of the actuator 110, 210 has passed through the aperture 105, 205 in the end cap 104, 204 to an exterior of the vent valve assembly 100, 200.

[0088] Referring to FIGS. 39-40, an example leak check process 700 for testing an enclosure for leaks is provided. At step 702, a vent valve assembly, such as any of the vent valve assemblies 100, 200, 300, 400 disclosed herein, is mounted to an enclosure E. A leak check fixture, such as any of the leak check fixtures F, 500, 600 disclosed herein, is mounted over the vent valve assembly. In certain implementations, the leak check fixture F, 500, 600 is sealingly mounted (e.g., via a face seal and / or a radial seal) over the vent valve assembly 100, 200, 300, 400. In certain implementations, the leak check fixture F, 500, 600 secures to the enclosure E (e.g., to an outer surface of the enclosure E). For example, the leak check fixture F, 500, 600 may mechanically secure to the enclosure E.

[0089] At step 704, the poppet 122, 222, 322, 422 of the vent valve assembly 100, 200, 300, 400 is transitioned to the open position. In certain implementations, the poppet 122, 222, 322, 422 is opened using the leak check actuator 110, 210, 310, 410. In some examples, the actuator 110, 210 is pulled by a user. In other examples, the actuator 110, 210 is twisted by a user. In certain implementations, the actuator 310, 410 is moved using the leak check fixture.

[0090] At step 706, a pressure is charged through the leak check fixture F, 500, 600. In some examples, the leak check fixture F, 500, 600 supplies fluid to the interior of the enclosure through the vent valve assembly 100, 200, 300, 400 while the poppet 122, 222, 322, 422 is open. In other examples, the leak check fixture F, 500, 600 draws a vacuum within the enclosure interior through the vent valve assembly 100, 200, 300, 400.

[0091] At step 708, a pressure decay or vacuum decay within the enclosure interior is monitored to determine whether any leaks are present. In certain implementations, because the leak check is performed through the vent valve assembly 100, 200, 300, 400, the process can detect leaks at the sealing interface between the vent valve assembly 100, 200, 300, 400 and the enclosure E.

[0092] At step 710, the poppet 122, 222, 322, 422 of the vent valve assembly 100, 200, 300, 400 is transitioned to the closed position. For example, the poppet 122, 222 can be moved via the leak check actuator 110, 210. In another example, an interface 506, 606 of the leak check fixture 500, 600 can be manipulated (e.g., rotated) to lower the poppet 322, 422 until the poppet 322, 422 seals against the valve seat 325, 425.

[0093] In some implementations, the leak check process 700 then moves to step 716 at which the leak check fixture F, 500, 600 is removed from the enclosure E while the vent valve assembly 100, 200, 300, 400 remains mounted at the enclosure E. In other implementations, steps 712 and 714 are performed to confirm that the poppet 122, 222, 322, 422 properly closed and sealed against the valve seat 125, 225, 325, 125.

[0094] At step 712, pressure is charged through the leak check fixture F, 500, 600 while the poppet 122, 222, 322, 422 is closed. Accordingly, instead of supplying pressure to or drawing a vacuum from the enclosure interior, the pressure / vacuum is instead provided between the leak check fixture F, 500, 600 and the poppet 122, 222, 322, 422 (e.g., between the poppet 122, 222, 322, 422 and the windows 108, 208, 308, 408 of the valve assembly 100, 200, 300, 400).

[0095] At step 714, a pressure decay within the vent valve assembly 100, 200, 300, 400 is monitored. If the poppet 122, 222, 322, 422 is not properly closed, then the pressure will decay quickly from a charge pressure CP to atmospheric pressure AP (e.g., see pressure curve LI of FIG. 40). In such a decay is observed, the leak check process 700 may determine an error is mounted the vent valve arrangement. In contrast, if the poppet 122, 222, 322, 422 is properly closed, then a slower pressure decay is observed (e.g., see pressure curve L2 of FIG. 40). Once the poppet 122, 222, 322, 422 is confirmed closed, the process 700 proceeds to removing the fixture F, 500, 600 at step 716.

[0096] Example implementations of the disclosure are provided in the following aspects:

[0097] Aspect 1. A vent valve assembly configured to mount to an enclosure, the vent valve assembly comprising:

[0098] a body having a first end configured to be disposed at least partially within the enclosure and a second end configured to be disposed external of the enclosure when the body is mounted to the enclosure, the body defining a passage;

[0099] a poppet configured to move relative to the body between a closed position closing the passage and an open position opening the passage, the poppet moving towards the first end when moving towards the closed position and the poppet moving towards the second end when moving towards the open position;

[0100] a biasing member configured to bias the poppet to the closed position; and

[0101] an actuator arrangement configured to move the poppet towards the open position.

[0102] Aspect 2. The vent valve assembly of aspect 1, wherein the actuator arrangement is accessible from an exterior of the vent valve assembly.

[0103] Aspect 3. The vent valve assembly of aspect 1, wherein the actuator arrangement has a twist-to-open configuration so that twisting the actuator arrangement pulls the poppet to the open position against the bias of the biasing member.

[0104] Aspect 4. The vent valve assembly of aspect 1, wherein the actuator arrangement includes a leak check fixture mounted over the body, the leak check fixture including a pin having a first end configured to interact with a contoured surface of the leak check fixture and a second end configured to interact with the poppet.

[0105] Aspect 5. The vent valve assembly of aspect 4, wherein the leak check fixture includes a rotatable interface body that carries the pin as the interface body rotates, and wherein rotation of the interface body transitions the poppet between the open and closed positions.

[0106] Aspect 6. The vent valve assembly of aspect 4, wherein the poppet includes a ramped surface along which the pin cams to lift the poppet as the pin rides over the contoured surface of the leak check fixture.

[0107] Aspect 7. The vent valve assembly of aspect 4, wherein the pin is one of a plurality of pins carried by the interface body, wherein the contoured surface of the leak check fixture is one of a plurality of contoured surfaces, and wherein each pin is configured to interact with a respective one of the contoured surfaces.

[0108] Aspect 8. The vent valve assembly of any of aspects 1-7, further comprising a membrane disposed within the body.

[0109] Aspect 9. The vent valve assembly of aspect 8, wherein the membrane forms a disc.

[0110] Aspect 10. The vent valve assembly of aspect 8, wherein the membrane forms a ring.

[0111] Aspect 11. The vent valve assembly of aspect 8, wherein the membrane forms a rectangle.

[0112] Aspect 12. A vent valve assembly configured to mount to an enclosure, the vent valve assembly comprising:

[0113] a body having a first end configured to be disposed at least partially within the enclosure and a second end configured to be disposed external of the enclosure when the body is mounted to the enclosure, the body defining a passage;

[0114] a poppet configured to move relative to the body between a closed position closing the passage and an open position opening the passage;

[0115] a biasing member configured to bias the poppet to the closed position; and

[0116] a camming arrangement by which the poppet is moved between the closed and open positions.

[0117] Aspect 13. The vent valve assembly of aspect 12, wherein the camming arrangement includes a ramped surface extending outwardly from a periphery of the poppet.

[0118] Aspect 14. The vent valve assembly of aspect 13, further comprising a leak check fixture selectively configurable in an actuated configuration and a de-actuated configuration, the leak check fixture including a leak check actuator being spaced from the ramped surface when the leak check fixture is disposed in the de-actuated configuration, and the leak check actuator supporting the ramped surface when the leak check fixture is disposed in the actuated configuration.

[0119] Aspect 15. The vent valve assembly of aspect 14, wherein the leak check fixture defines a contoured surface along which the leak check actuator rides as the leak check fixture is transitioned between the actuated and de-actuated configurations.

[0120] Aspect 16. The vent valve assembly of aspect 12, wherein the camming arrangement includes a ramped surface extending outwardly from a bottom of the poppet.

[0121] Aspect 17. The vent valve assembly of aspect 12, wherein the camming arrangement includes a ramped surface disposed on the body and facing towards the poppet, wherein the poppet is configured to cam over the ramped surface when rotated.

[0122] Aspect 18. The vent valve assembly of aspect 16 or aspect 17, further comprising a leak check fixture selectively configurable in an actuated configuration and a de-actuatedconfiguration, the leak check fixture including a leak check actuator being coupled to the poppet to rotate the poppet in unison with a portion of the leak check fixture, wherein rotating the poppet transitions the poppet between the open and closed positions via the ramped surface.

[0123] Aspect 19. A method of operating a vent valve assembly comprising:

[0124] passively venting an enclosure along a first flow path from an inlet of a vent valve assembly to an outlet of the vent valve assembly; and

[0125] manipulating an actuator to move a poppet of the vent valve assembly away from the inlet to open a second flow path to perform a leak check.

[0126] Aspect 20. The method of aspect 19, wherein manipulating the actuator comprises pulling the actuator.

[0127] Aspect 21. The method of aspect 19, wherein manipulating the actuator comprises twisting the actuator.

[0128] Aspect 22. The method of aspect 19, wherein manipulating the actuator comprises rotating the actuator about an axis of the vent valve assembly.

[0129] Aspect 23. The method of aspect 19, further comprising moving the poppet away from the inlet to open the second flow path during a pressure spike at the inlet.

[0130] Aspect 24. The method of aspect 19, further comprising:

[0131] closing the poppet;

[0132] charging pressure via the leak check fixture; and

[0133] obtaining pressure readings confirming the poppet is closed.

[0134] Aspect 25. A method of leak checking a vent valve assembly installed at an enclosure, the method comprising:

[0135] sealingly mounting a leak check fixture over the vent valve assembly while the vent valve assembly is mounted at the enclosure;

[0136] arranging the leak check fixture in an open configuration to open a leak check path within the vent valve assembly;

[0137] performing a leak check with the leak check fixture arranged in the open configuration;

[0138] arranging the leak check fixture in a closed configuration to close the leak check path within the vent valve assembly; and

[0139] performing another leak check with the leak check fixture arranged in the closed configuration.

[0140] Aspect 26. The method of aspect 25, wherein arranging the leak check fixture in the open configuration and arranging the leak check fixture in the closed configuration comprises rotating a portion of the leak check fixture.

[0141] Aspect 27. The method of aspect 25 or aspect 26, wherein performing the leak check and performing the another leak check comprises supplying pressurized fluid into the vent valve assembly using the leak check fixture.

[0142] Aspect 28. The method of aspect 25 or aspect 26, wherein performing the leak check and performing the another leak check comprises drawing a vacuum using the leak check fixture.

[0143] Aspect 29. A vent valve assembly comprising:

[0144] a body;

[0145] an end cap closing the body;

[0146] a poppet configured to move relative to the body between a closed position and an open position;

[0147] a biasing member biasing the poppet to the closed position; and

[0148] an actuator arrangement operably coupled to the poppet, the actuator arrangement including an actuator extending through the end cap to an exterior of the vent valve assembly, the actuator arrangement being actuatable from the exterior of the vent valve assembly to move the poppet from the closed position to the open position.

[0149] Aspect 30. The vent valve assembly of aspect 29, wherein the actuator is a twist- to-actuate member.

[0150] Aspect 31. The vent valve assembly of aspect 29, wherein the actuator is a pull- to-actuate member.

[0151] Aspect 32. The vent valve assembly of any of aspects 29-31, further comprising a membrane disposed within the body.

[0152] Aspect 33. The vent valve assembly of aspect 32, wherein the membrane forms a disc.

[0153] Aspect 34. The vent valve assembly of aspect 32, wherein the membrane forms a ring.

[0154] Aspect 35. The vent valve assembly of aspect 32, wherein the membrane forms a rectangle.

[0155] Having described the preferred aspects and implementations of the present disclosure, modifications and equivalents of the disclosed concepts may readily occur to oneskilled in the art. However, it is intended that such modifications and equivalents be included within the scope of the claims which are appended hereto.

Claims

What is claimed is:

1. A vent valve assembly configured to mount to an enclosure, the vent valve assembly comprising: a body having a first end configured to be disposed at least partially within the enclosure and a second end configured to be disposed external of the enclosure when the body is mounted to the enclosure, the body defining a passage; a poppet configured to move relative to the body between a closed position closing the passage and an open position opening the passage, the poppet moving towards the first end when moving towards the closed position and the poppet moving towards the second end when moving towards the open position; a biasing member configured to bias the poppet to the closed position; and an actuator arrangement configured to move the poppet towards the open position.

2. The vent valve assembly of claim 1, wherein the actuator arrangement is accessible from an exterior of the vent valve assembly.

3. The vent valve assembly of claim 1, wherein the actuator arrangement has a twist-to- open configuration so that twisting the actuator arrangement pulls the poppet to the open position against the bias of the biasing member.

4. The vent valve assembly of claim 1, wherein the actuator arrangement includes a leak check fixture mounted over the body, the leak check fixture including a pin having a first end configured to interact with a contoured surface of the leak check fixture and a second end configured to interact with the poppet.

5. The vent valve assembly of claim 4, wherein the leak check fixture includes a rotatable interface body that carries the pin as the interface body rotates, and wherein rotation of the interface body transitions the poppet between the open and closed positions.

6. The vent valve assembly of claim 4, wherein the poppet includes a ramped surface along which the pin cams to lift the poppet as the pin rides over the contoured surface of the leak check fixture.

7. The vent valve assembly of claim 4, wherein the pin is one of a plurality of pins carried by the interface body, wherein the contoured surface of the leak check fixture is one of a plurality of contoured surfaces, and wherein each pin is configured to interact with a respective one of the contoured surfaces.

8. The vent valve assembly of any of claims 1-7, further comprising a membrane disposed within the body.

9. A method of operating a vent valve assembly comprising: passively venting an enclosure along a first flow path from an inlet of a vent valve assembly to an outlet of the vent valve assembly; and manipulating an actuator to move a poppet of the vent valve assembly away from the inlet to open a second flow path to perform a leak check.

10. The method of claim 9, wherein manipulating the actuator comprises pulling the actuator.

11. The method of claim 9, wherein manipulating the actuator comprises twisting the actuator.

12. The method of claim 9, wherein manipulating the actuator comprises rotating the actuator about an axis of the vent valve assembly.

13. The method of claim 9, further comprising moving the poppet away from the inlet to open the second flow path during a pressure spike at the inlet.

14. The method of claim 9, further comprising: closing the poppet; charging pressure via the leak check fixture; and obtaining pressure readings confirming the poppet is closed.

15. A vent valve assembly configured to mount to an enclosure, the vent valve assembly comprising:a body having a first end configured to be disposed at least partially within the enclosure and a second end configured to be disposed external of the enclosure when the body is mounted to the enclosure, the body defining a passage; a poppet configured to move relative to the body between a closed position closing the passage and an open position opening the passage; a biasing member configured to bias the poppet to the closed position; and a camming arrangement by which the poppet is moved between the closed and open positions.

16. The vent valve assembly of claim 15, wherein the camming arrangement includes a ramped surface extending outwardly from a periphery of the poppet.

17. The vent valve assembly of claim 16, further comprising a leak check fixture selectively configurable in an actuated configuration and a de-actuated configuration, the leak check fixture including a leak check actuator being spaced from the ramped surface when the leak check fixture is disposed in the de-actuated configuration, and the leak check actuator supporting the ramped surface when the leak check fixture is disposed in the actuated configuration.

18. The vent valve assembly of claim 15, wherein the camming arrangement includes a ramped surface extending outwardly from a bottom of the poppet.

19. The vent valve assembly of claim 15, wherein the camming arrangement includes a ramped surface disposed on the body and facing towards the poppet, wherein the poppet is configured to cam over the ramped surface when rotated.

20. The vent valve assembly of claim 18 or claim 19, further comprising a leak check fixture selectively configurable in an actuated configuration and a de-actuated configuration, the leak check fixture including a leak check actuator being coupled to the poppet to rotate the poppet in unison with a portion of the leak check fixture, wherein rotating the poppet transitions the poppet between the open and closed positions via the ramped surface.

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