Explosion-proof vent valve

Abstract

The explosion-proof ventilation valve (200) includes: a valve cover (10); a valve body (9) mounted to the valve cover (10); a membrane (98) that is impermeable to water but permeable to gas, the membrane (98) being disposed on the valve body (9); a valve assembly mounted in the valve body (9); and a filter assembly (100) mounted to the valve body (9). The filter assembly (100) includes: an upper housing (6); a lower housing (7) mounted to the upper housing (6) and extending cylindrically along a longitudinal axis (101); an inner support frame (1) extending cylindrically along the longitudinal axis (101); an outer support frame (2) extending cylindrically along the longitudinal axis (101) and disposed radially outside the inner support frame (1); a filter element (3); and a lower end cap (8) for the filter.

Description

Technical Field

[0001] The embodiments relate to explosion-proof ventilation valves, and more specifically to explosion-proof ventilation valves for battery packs used, for example, in electric vehicles. Background Technology

[0002] For battery packs such as lithium iron phosphate or ternary lithium batteries, if the battery pack is overcharged, over-discharged, short-circuited, mechanically damaged, or exposed to high external temperatures, the internal chemical reactions can become uncontrollable, leading to a rapid increase in temperature and triggering a series of adverse reactions. The electrolyte and other flammable materials may burn, and the battery temperature will rapidly rise to 300°C–1000°C, releasing large amounts of white or gray smoke, including: gases such as flammable and toxic carbon monoxide (CO) and highly corrosive and toxic hydrogen fluoride (HF); particles including heavy metals and toxic substances harmful to the respiratory system; and / or other volatile organic compounds (VOCs). If these gases are not promptly vented to the outside of the battery pack, the internal pressure will rise sharply within a short period, causing the battery pack to rupture or even explode, which will compromise passenger safety.

[0003] These gases are harmful to human health, and excessive inhalation can lead to poisoning or even suffocation. The materials inside the battery include potassium salts and lithium manganese oxides, which produce large amounts of smoke when burned. This smoke contains a large amount of fine particulate matter and organic matter, which pollutes air quality and increases the risk of fire spread. The lower casing of the battery pack is typically made of metals such as aluminum, cobalt, and manganese, and this casing may shatter when the battery explodes, releasing metal fragments. These fragments can not only cause injury but also potentially ignite secondary fires. Existing explosion-proof valves cannot adsorb harmful gases or filter other harmful substances during emergency abnormal ventilation of the battery, and they cannot make the smoke invisible.

[0004] Therefore, it is desirable to develop an explosion-proof ventilation valve that is simple in structure, integrates filtration function, and can operate reliably under different operating conditions. Summary of the Invention

[0005] The purpose of this disclosure is to provide an explosion-proof ventilation valve that has a simple structure, integrated filtration function, and can operate reliably under different operating conditions.

[0006] In one aspect, an explosion-proof ventilation valve is provided. The explosion-proof ventilation valve includes: a valve cover; a valve body mounted to the valve cover; a membrane that is impermeable to water but permeable to gas, the membrane being disposed on the valve body; a valve assembly mounted in the valve body; and a filter assembly mounted to the valve body.

[0007] The filter assembly includes: an upper housing; a lower housing mounted to the upper housing and extending cylindrically along a longitudinal axis; an inner support frame extending cylindrically along a longitudinal axis; an outer support frame extending cylindrically along a longitudinal axis and disposed radially outside the inner support frame to define an annular filter space between the outer support frame and the inner support frame, and defining an annular filtered space between the outer support frame and the upper and lower housings; a filter element disposed within the annular filter space, the filter element including an inner filter screen, an outer filter screen, and at least one filter media layer disposed between the inner and outer filter screens, the filter element being zigzaggedly folded between the outer and inner support frames to form an annulus; and a lower filter end cap holding the lower ends of the inner and outer support frames and supporting the inner support frame, the filter element, and the outer support frame on the lower housing.

[0008] The upper housing may include: a mounting portion configured to be mounted to a battery housing and including an upper opening; and an annular flange extending downward from the outer periphery of the upper opening to define an upper filter annular space, the upper filter annular space holding the upper ends of the inner support frame and the upper ends of the outer support frame.

[0009] The lower end cap of the filter may include an annular plate body, an internal protrusion extending upward from the annular plate body around the inner periphery of the annular plate body, and an external flange extending upward around the outer periphery of the annular plate body. The annular plate body closes the lower end of the outer support frame and the lower end of the inner support frame. The internal protrusion abuts against the inner side of the inner support frame, and the external flange abuts against the outer side of the outer support frame.

[0010] The lower housing may further include multiple support portions, which are circumferentially distributed around the lower portion of the lower housing and form flow channels between adjacent support portions. The multiple support portions extend inward from the inner wall of the lower housing, support the lower end cap of the filter, and abut against the outer flange.

[0011] The lower housing may further include an annular shoulder with a shoulder diameter, and the lower end cap of the filter may further include a plurality of reinforcing ribs extending diagonally downward from the annular plate body, each of the plurality of reinforcing ribs having a length L corresponding to the shoulder diameter, to be received in the annular shoulder to position the lower end cap of the filter.

[0012] The plurality of reinforcing ribs may be two reinforcing ribs forming a cross shape.

[0013] The outer support frame and the inner support frame may be hollow cylinders and may include a plurality of openings that extend radially through the sidewalls of the outer support frame and the inner support frame.

[0014] The upper housing may include an annular groove on its upper surface, the annular groove being configured to receive a battery seal.

[0015] The valve cover may include a plurality of elastic tabs extending downward from the valve cover, and the valve body may include a plurality of corresponding protrusions. Each of the plurality of elastic tabs includes a through hole and is configured to slide over a corresponding protrusion among the plurality of protrusions on the valve body, such that the corresponding protrusion among the plurality of protrusions engages in the through hole and holds the valve cover and valve body in place.

[0016] The valve body may include a first mounting portion and a second mounting portion, and the valve assembly may include a first intake valve assembly mounted in the first mounting portion along a first mounting direction, and a second ventilation valve assembly mounted in the second mounting portion along a second mounting direction opposite to the first mounting direction.

[0017] The second ventilation valve assembly is larger than the first intake valve assembly.

[0018] The lower housing may include an annular lower housing groove on its bottom surface. Correspondingly, the valve body may include an annular upper body groove on its top surface. The annular lower housing groove and the annular upper body groove are radially aligned for receiving the body seal.

[0019] In another aspect, a battery pack is provided. The battery pack includes: a battery housing; at least one battery cell disposed within the battery housing; and an explosion-proof ventilation valve, which is described above and installed in the battery housing.

[0020] With the help of filter components, toxic gases, particulate matter and / or metal fragments can be reliably filtered out in the event of a thermal runaway event in the battery pack.

[0021] The filter assembly is pre-assembled as a module and can be easily installed onto the explosion-proof ventilation valve, thus facilitating the assembly and replacement of the filter assembly.

[0022] By utilizing the multi-stage filtration of the filter assembly, particles, liquids, and / or harmful gases of different sizes can be reliably filtered out or absorbed. Larger particles can be intercepted in the internal support frame and internal filter screen of the filter assembly to prevent clogging of at least one filter media layer, thereby ensuring unobstructed gas flow during thermal runaway events and thus preventing the battery pack from exploding.

[0023] With the help of the lower end cap of the filter, the filter element can be reliably positioned in the external support frame and the internal support frame with a simple structure.

[0024] With the help of reinforcing ribs, the lower end cap of the filter can be reliably supported and positioned on the lower housing.

[0025] The second ventilation valve assembly, used as a ventilation valve, is larger than the first intake valve assembly, used as an intake valve, thus saving the total cost of the explosion-proof ventilation valve while ensuring its proper operation.

[0026] Other areas of application of this disclosure will become apparent from the detailed description, claims, and drawings. The detailed description and specific examples are intended for illustrative purposes only and are not intended to limit the scope of this disclosure. Attached Figure Description

[0027] This disclosure will be more fully understood from the detailed description and accompanying drawings.

[0028] Figure 1 This is a schematic perspective view of an example explosion-proof ventilation valve according to an embodiment.

[0029] Figure 2 yes Figure 1 A schematic top view of an explosion-proof ventilation valve.

[0030] Figure 3 yes Figure 1 Explosion-proof ventilation valve along Figure 2 A schematic cross-sectional view of section line AA.

[0031] Figure 4 yes Figure 1 Explosion-proof ventilation valve along Figure 2 A schematic cross-sectional view of section line BB, wherein, for clarity, the first intake valve assembly and the second ventilation valve assembly are omitted.

[0032] Figure 5 yes Figure 1 A schematic front view of an explosion-proof ventilation valve.

[0033] Figure 6 yes Figure 1 A schematic front view of the internal support frame of the filter assembly of an explosion-proof ventilation valve.

[0034] Figure 7 yes Figure 1 A schematic cross-sectional view of a portion of the filter assembly of an explosion-proof ventilation valve, showing the filter element, the external support frame, and the internal support frame.

[0035] Figure 8 yes Figure 7 A schematic enlarged cross-sectional view of the filter element.

[0036] Figure 9 This is a schematic perspective view of another example explosion-proof ventilation valve according to an embodiment.

[0037] Figure 10 yes Figure 9 A schematic top view of an explosion-proof ventilation valve.

[0038] Figure 11 yes Figure 9 Explosion-proof ventilation valve along Figure 10 A schematic cross-sectional view of the cross-section line CC.

[0039] Figure 12 yes Figure 9 Explosion-proof ventilation valve along Figure 10 A schematic cross-sectional view of the cross-section line DD.

[0040] Figure 13 yes Figure 9 A schematic front view of an explosion-proof ventilation valve. Detailed Implementation

[0041] The following description is merely exemplary in nature and is not intended to limit this disclosure, its application, or its use. It should be understood that throughout the drawings, corresponding reference numerals denote similar or corresponding parts and features. Furthermore, the drawings are generally schematic and not necessarily drawn to scale. Some features may be exaggerated or minimized to show detail of particular parts. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but are merely representative bases for teaching those skilled in the art to use this disclosure in various ways.

[0042] Certain terms may be used for reference only in the following description and are therefore not intended to be limiting. For example, terms such as “above” and “below” refer to orientations in the referenced figures. Terms such as “front,” “rear,” “front,” “rear,” “left,” “right,” “rear,” “side,” “up,” “down,” “horizontal,” “vertical,” “top,” and “bottom” describe the orientation and / or position of parts of a component or element within a consistent but arbitrary frame of reference, as will become clear from the text describing the component or element in question and the associated figures.

[0043] Furthermore, terms such as "first," "second," and "third" may be used to describe individual components. These terms are used to describe the accompanying drawings and do not constitute a limitation on the scope of this disclosure as defined by the appended claims.

[0044] Referring now to the accompanying drawings, in which the same reference numerals refer to the same features throughout multiple views. Figure 1This is a schematic perspective view of an example explosion-proof ventilation valve 200 according to an embodiment. Figure 2 yes Figure 1 A schematic top view of the explosion-proof ventilation valve 200. Figure 3 yes Figure 1 Explosion-proof ventilation valve 200 Figure 2 A schematic cross-sectional view of section line AA. Figure 4 yes Figure 1 Explosion-proof ventilation valve 200 Figure 2 A schematic cross-sectional view of the cross-section line BB, wherein, for clarity, the first intake valve assembly 110 and the second ventilation valve assembly 120 are omitted. Figure 5 yes Figure 1 A schematic front view of the explosion-proof ventilation valve 200.

[0045] The explosion-proof ventilation valve 200 is used, for example, in battery packs used in electric vehicles. However, as those skilled in the art will understand, the explosion-proof ventilation valve 200 can also be used as needed for any other suitable application without departing from the scope of this disclosure.

[0046] According to one example, the explosion-proof ventilation valve 200 may include: a valve cover 10; a valve body 9 mounted to the valve cover 10; a membrane 98; a valve assembly mounted in the valve body 9; and a filter assembly 100 mounted to the valve body 9. As those skilled in the art will understand, the explosion-proof ventilation valve 200 may include other components, such as seals, as needed, without departing from the scope of this disclosure.

[0047] Membrane 98 is impermeable to water but permeable to gas. Membrane 98 is installed on valve body 9. For example... Figure 3 As shown, membrane 98 is disposed below valve body 9 and above valve cover 10. According to one example, membrane 98 may be disposed on the bottom surface of valve body 9; however, as those skilled in the art will understand, membrane 98 may be disposed in any other suitable location without departing from the scope of this disclosure. Membrane 98 may be attached to valve body 9 by any suitable means, such as by adhesive. Membrane 98 may be formed of a microporous material. The micropores in the material allow gas transport through membrane 98 but prevent moisture transport through membrane 98. In particular, membrane 98 may be formed of, for example, perfluorosulfonic acid; however, as those skilled in the art will understand, membrane 98 may be formed of any other suitable material as needed without departing from the scope of this disclosure. Membrane 98 may include a hydrophobic coating thereon. By means of said hydrophobic coating, moisture in ambient air can be prevented from entering the filter assembly, thereby extending the service life of the filter assembly.

[0048] The valve body 9 is mounted to the valve cover 10. According to one example, the valve cover 10 may include a plurality of resilient tabs 102 extending downward from the valve cover 10, and the valve body 9 may include a corresponding plurality of protrusions 92. Each resilient tab 102 may include a through-hole 14. Each resilient tab 102 may slide over a corresponding protrusion 92 on the valve body 9 such that the corresponding protrusion 92 engages in the through-hole 14, holding the valve cover 10 and the valve body 9 in place. As those skilled in the art will understand, the valve body 9 may be mounted to the valve cover 10 in any other suitable manner without departing from the scope of this disclosure. Figure 4 As shown, when the valve body 9 is installed onto the valve cover 10, radial gaps 97 exist at some circumferential locations between the outer surface of the valve body 9 and the inner surface of the valve cover 10. These radial gaps 97 are used for gas discharge. By means of the radial gaps 97 hidden between the outer surface of the valve body 9 and the inner surface of the valve cover 10, the membrane 98 can be protected, and foreign substances can be prevented from entering the explosion-proof ventilation valve 200.

[0049] According to one example, the valve body 9 may include a first mounting portion 36 and a second mounting portion 136. The valve assembly may include a first intake valve assembly 110 mounted in the first mounting portion 36 along a first mounting direction 210, and a second ventilation valve assembly 120 mounted in the second mounting portion 136 along a second mounting direction 220 opposite to the first mounting direction 210.

[0050] According to one example, the second ventilation valve assembly 120 may be larger than the first intake valve assembly 110. The second ventilation valve assembly 120 can be used as a ventilation valve, the first intake valve assembly 110 can be used as an intake valve, and the second ventilation valve assembly 120 can be larger than the first intake valve assembly 110, thereby saving the total cost of the explosion-proof ventilation valve 200 while ensuring the proper operation of the explosion-proof ventilation valve 200.

[0051] According to one example, the filter assembly 100 may include: an upper housing 6; a lower housing 7 mounted to the upper housing 6 and extending cylindrically along a longitudinal axis 101; an inner support frame 1 extending cylindrically along the longitudinal axis 101; an outer support frame 2 extending cylindrically along the longitudinal axis 101; a filter element 3; and a lower end cap 8. As those skilled in the art will understand, the filter assembly 100 may include other components, such as seals, as needed, without departing from the scope of this disclosure.

[0052] With the help of the filter assembly 100, toxic gases, particulate matter and / or metal fragments can be reliably filtered out in the event of a thermal runaway event in the battery pack.

[0053] The filter assembly 100 is pre-assembled as a module and can be easily installed onto the explosion-proof ventilation valve, thereby facilitating the assembly and replacement of the filter assembly 100.

[0054] According to one example, the upper housing 6 may include: a mounting portion 63 configured to be mounted to a battery housing and including an upper opening 62; an annular flange 65 extending downward from the outer periphery of the upper opening 62 to define an annular space 69 for an upper filter; and an annular cover groove 64 disposed on the top surface of the upper housing 6 for receiving a battery seal. The mounting portion 63 may include a plurality of mounting holes 61 for receiving fasteners, such as bolts, screws, etc. Figure 1 As shown, there are four mounting holes 61, one at each corner of the mounting portion 63. As those skilled in the art will understand, the mounting portion 63 may include any other suitable number of mounting holes 61, such as two, three, etc., without departing from the scope of this disclosure. The upper filter annular space 69 holds the upper end of the inner support frame 1 and the upper end of the outer support frame 2.

[0055] According to one example, the lower housing 7 may include a generally cylindrical lower housing body and an outlet 72 at its lower end. The lower housing 7 may include an annular lower housing groove 73 on its bottom surface. Correspondingly, the valve body 9 may include an annular upper body groove 93 on its top surface. The annular lower housing groove 73 is radially aligned with the annular upper body groove 93 for receiving the body seal 201.

[0056] According to one example, the outer support frame 2 extends cylindrically along the longitudinal axis 101 and is disposed radially outside the inner support frame 1 to define an annular filter space 21 between the outer support frame 2 and the inner support frame 1, and to define an annular filtered space 11 between the outer support frame 2 and the upper housing 6 and the lower housing 7.

[0057] Furthermore, the upper housing 6 may include an annular mounting flange 68 extending downward from the outer periphery of the upper housing 6. The annular mounting flange 68 may be configured to be mounted to the lower housing 7, for example, by welding or any other suitable method.

[0058] According to one example, the lower end cap 8 of the filter may include an annular plate body 84, an internal protrusion 81 extending upward from the annular plate body 84 around its inner periphery, and an external flange 83 extending upward around its outer periphery. The annular plate body 84 closes the lower end of the outer support frame 2 and the lower end of the inner support frame 1. The internal protrusion 81 abuts against the inner side of the inner support frame 1, and the external flange 83 abuts against the outer side of the outer support frame 2.

[0059] According to one example, the lower housing 7 may further include a plurality of support portions 71 circumferentially distributed around the lower portion of the lower housing 7, forming flow channels 75 between adjacent support portions 71. The plurality of support portions 71 extend inwardly from the inner sidewall of the lower housing 7, supporting the lower end cap 8 of the filter and abutting against the outer flange 83. According to one example, the housing 7 may include three support portions 71 evenly distributed around the lower portion of the housing 7. As will be understood by those skilled in the art, the housing 7 may include any other suitable number of support portions 71, such as four, five, etc., without departing from the scope of this disclosure.

[0060] With the help of the lower end cap 8, the filter element 3 can be reliably positioned in the outer support frame 2 and the inner support frame 1 with a simple structure.

[0061] The lower end cap 8 of the filter may also include a plurality of reinforcing ribs 82 extending diagonally downward from the annular plate body 84. In this respect, the lower housing 7 may also include an annular shoulder 74 having a shoulder diameter. Each reinforcing rib 82 has a length L corresponding to the shoulder diameter, to be received within the annular shoulder 74 to position the lower end cap 8 of the filter. According to one example, the plurality of reinforcing ribs 82 are two reinforcing ribs 82 forming a cross shape. As those skilled in the art will understand, the lower end cap 8 of the filter may include any other suitable number of reinforcing ribs 82, such as three, four, etc., without departing from the scope of this disclosure.

[0062] With the help of reinforcing ribs 82, the lower end cap 8 of the filter can be reliably supported and positioned on the lower housing 7.

[0063] Furthermore, the lower housing 7 may include a plurality of first mounting holes 76 in its bottom surface. Correspondingly, the valve body 9 may include a plurality of second mounting holes 96 extending through the body flange. The plurality of first mounting holes 76 and the plurality of second mounting holes 96 are aligned and configured to receive threaded fasteners (not shown).

[0064] Figure 6 yes Figure 1 A schematic front view of the internal support frame 1 of the filter assembly 100 of the explosion-proof ventilation valve 200. Figure 6As shown, the inner support frame 1 is a hollow cylinder and includes a plurality of orifices 12 extending radially through the sidewalls of the inner support frame 1. The outer support frame 2 may have the same structure as the inner support frame 1, except that it has a larger diameter than the inner support frame 1. That is, the outer support frame 2 is a hollow cylinder and includes a plurality of orifices 12 extending radially through the sidewalls of the outer support frame 2. Furthermore, the orifices 12 of the outer support frame 2 may be smaller than the orifices 12 of the inner support frame 1.

[0065] Figure 7 yes Figure 1 A schematic cross-sectional view of a portion of the filter assembly 100 of the explosion-proof ventilation valve 200, showing the filter element 3, the outer support frame 2, and the inner support frame 1. Figure 8 yes Figure 7 A schematic enlarged cross-sectional view of filter element 3.

[0066] The filter element 3 is disposed within the annular filter space 21 between the outer support frame 2 and the inner support frame 1. According to one example, the filter element 3 may include an inner filter screen 33, an outer filter screen 31, and at least one filter media layer 32 disposed between the inner filter screen 33 and the outer filter screen 31. According to one example, the inner filter screen 33 and the outer filter screen 31 may be made of metal to provide support and protection for the at least one filter media layer 32. As those skilled in the art will understand, the inner filter screen 33 and the outer filter screen 31 may be made of any other suitable material, such as polyethylene, without departing from the scope of this disclosure.

[0067] With the help of the multi-stage filtration of the filter assembly 100, particles, liquids and / or harmful gases of different sizes can be reliably filtered out or absorbed. Larger particles can be intercepted in the internal support frame 1 and internal filter screen 33 of the filter assembly 100 to prevent clogging of at least one filter media layer 32, thereby resulting in unobstructed gas flow during thermal runaway events and thus avoiding battery pack explosion.

[0068] According to one example, the filter element 3 may be folded in a zigzag pattern between the outer support frame 2 and the inner support frame 1 to form an annular shape. The folded filter element 3 increases the filtration area of ​​the filter assembly 100. At least one filter media layer 32 may be fiber filter paper. As those skilled in the art will understand, at least one filter media layer 32 may be made of any other suitable material without departing from the scope of this disclosure. According to one example, at least one filter media layer 32 may include an absorbent for absorbing harmful gases. Furthermore, at least one filter media layer 32 may include multiple filter media layers.

[0069] Figure 9 This is a schematic perspective view of another example explosion-proof ventilation valve 200 according to an embodiment. Figure 10 yes Figure 9 A schematic top view of the explosion-proof ventilation valve 200. Figure 11 yes Figure 9 Explosion-proof ventilation valve 200 Figure 10 A schematic cross-sectional view of the cross-section line CC. Figure 12 yes Figure 9 Explosion-proof ventilation valve 200 Figure 10 A schematic cross-sectional view of the cross-section line DD. Figure 13 yes Figure 9 A schematic front view of the explosion-proof ventilation valve 200. Figures 9-13 The explosion-proof ventilation valve 200 shown is... Figures 1-5 The explosion-proof ventilation valve 200 shown is basically the same; for the sake of simplicity, the similarity is omitted. Figures 1-5 The description of the same parts as the explosion-proof ventilation valve 200.

[0070] According to one example, the valve assembly includes a single valve assembly 130 to simplify the structure of the explosion-proof ventilation valve 200. Additionally, the lower housing 7 may include an annular mounting flange 78 extending upward from the outer periphery of the lower housing 7. The annular mounting flange 78 is configured to be mounted to the upper housing 6, for example, by welding or any other suitable method.

[0071] Furthermore, the lower housing 7 may include a plurality of first mounting holes (not shown) in its bottom surface. Correspondingly, the valve body 9 may include a plurality of second mounting holes (not shown) extending through a body flange. The plurality of first mounting holes and the plurality of second mounting holes are aligned and configured to receive threaded fasteners (not shown). The lower housing 7 and the valve body 9 may be fastened by any other suitable method, such as welding, without departing from the scope of this disclosure.

[0072] When the battery pack experiences a thermal runaway event, the pressure difference between the internal pressure of the battery pack and the ambient pressure overcomes the spring force of the valve assembly, causing the valve assembly to open and thus putting the explosion-proof vent valve 200 into ventilation mode. Gas inside the battery pack flows towards the environment; specifically, the gas flows through the upper opening 62 and into the internal space of the internal support frame 1. The gas then flows radially outward, passing through the filter element 3. In this respect, toxic gases, particulate matter, and / or metal fragments can be reliably filtered out by the filter element 3 to produce filtered gas. The filtered gas then flows through the external support frame 2, the annular filtered space 11, and the flow channel 75 between adjacent support portions 71, and thus exits the explosion-proof vent valve 200 via the outlet 72.

[0073] In another aspect, a battery pack is provided. The battery pack includes: a battery housing, at least one battery cell disposed within the battery housing, and an explosion-proof ventilation valve 200 mounted to the battery housing.

[0074] Various aspects of this disclosure have been described in detail with reference to the illustrated embodiments; however, those skilled in the art will recognize that many modifications can be made thereto without departing from the scope of this disclosure. This disclosure is not limited to the precise structure and composition disclosed herein; any and all modifications, variations, and modifications apparent from the foregoing description are within the scope of this disclosure as defined by the appended claims. Furthermore, this concept expressly includes any and all combinations and sub-combinations of the foregoing elements and features.

Claims

1. An explosion-proof ventilation valve (200), comprising: Valve cover (10); Valve body (9), which is mounted to valve cover (10); A membrane (98) is impermeable to water but permeable to gas, and the membrane (98) is disposed on the valve body (9); Valve assembly installed in valve body (9); as well as A filter assembly (100) is installed on the valve body (9), the filter assembly (100) comprising: Upper shell (6); The lower housing (7) is mounted to the upper housing (6) and extends in a cylindrical shape along the longitudinal axis (101); An internal support frame (1) extends in a cylindrical shape along a longitudinal axis (101); An external support frame (2) extends cylindrically along a longitudinal axis (101) and is disposed radially outside the inner support frame (1) to define an annular filter space (21) between the external support frame (2) and the inner support frame (1), and to define an annular filtered space (11) between the external support frame (2) and the upper housing (6) and the lower housing (7). A filter element (3) is disposed within an annular filter space (21), the filter element (3) comprising an inner filter screen (33), an outer filter screen (31), and at least one filter media layer (32) disposed between the inner filter screen (33) and the outer filter screen (31), the filter element (3) being zigzaggedly folded between an outer support frame (2) and an inner support frame (1) to form an annular shape; and The filter lower end cap (8) holds the lower end of the inner support frame (1) and the lower end of the outer support frame (2), and supports the inner support frame (1), filter element (3) and outer support frame (2) on the lower housing (7).

2. The explosion-proof ventilation valve (200) according to claim 1, wherein, The upper housing (6) includes: Mounting portion (63), said mounting portion (63) configured to be mounted to battery housing and including upper opening (62); and An annular flange (65) extends downward from the outer periphery of the upper opening (62) to define an upper filter annular space (69), which holds the upper end of the inner support frame (1) and the upper end of the outer support frame (2).

3. The explosion-proof ventilation valve (200) according to claim 1, wherein, The lower end cap (8) of the filter includes an annular plate body (84), an inner protrusion (81) extending upward from the annular plate body (84) around its inner periphery, and an outer flange (83) extending upward from the outer periphery of the annular plate body (84). The annular plate body (84) closes the lower end of the outer support frame (2) and the lower end of the inner support frame (1). The inner protrusion (81) abuts against the inner side of the inner support frame (1), and the outer flange (83) abuts against the outer side of the outer support frame (2). The lower housing (7) also includes a plurality of support portions (71) which are circumferentially distributed around the lower portion of the lower housing (7) and form flow channels (75) between adjacent support portions. The plurality of support portions (71) extend inward from the inner sidewall of the lower housing (7) to support the lower end cap (8) of the filter and abut against the outer flange (83).

4. The explosion-proof ventilation valve (200) according to claim 3, wherein, The lower housing (7) also includes an annular shoulder (74) having a shoulder diameter, and The lower end cap (8) of the filter also includes a plurality of reinforcing ribs (82) extending diagonally downward from the annular plate body (84), each of the plurality of reinforcing ribs (82) having a length L corresponding to the diameter of the shoulder, to be received in the annular shoulder (74) to position the lower end cap (8) of the filter.

5. The explosion-proof ventilation valve (200) according to claim 4, wherein, The plurality of reinforcing ribs (82) are two reinforcing ribs that form a cross shape.

6. The explosion-proof ventilation valve (200) according to claim 1, wherein the outer support frame (2) and the inner support frame (1) are hollow cylinders and include a plurality of orifices (12) extending radially through the sidewalls of the outer support frame (2) and the inner support frame (1).

7. The explosion-proof ventilation valve (200) according to claim 1, wherein, The upper housing (6) includes an annular groove (64) on its upper surface, the annular groove (64) being configured to receive a battery seal.

8. The explosion-proof ventilation valve (200) according to claim 1, wherein, The valve cover (10) includes a plurality of resilient tabs (102) extending downward from the valve cover (10), and The valve body (9) includes a plurality of corresponding protrusions (92), each of the plurality of elastic tabs (102) including a through hole (14) and configured to slide over a corresponding protrusion of the plurality of corresponding protrusions (92) on the valve body (9) such that the corresponding protrusion of the plurality of corresponding protrusions (92) engages in the through hole (14) and holds the valve cover (10) and the valve body (9) in place.

9. The explosion-proof ventilation valve (200) according to claim 1, wherein, The valve body (9) includes a first mounting portion (36) and a second mounting portion (136), and The valve assembly includes a first intake valve assembly (110) mounted in a first mounting portion (36) along a first mounting direction (210), and a second ventilation valve assembly (120) mounted in a second mounting portion (136) along a second mounting direction (220) opposite to the first mounting direction (210).

10. The explosion-proof ventilation valve (200) according to claim 9, wherein, The second ventilation valve assembly (120) is larger than the first intake valve assembly (110).

11. The explosion-proof ventilation valve (200) according to claim 1, wherein, The lower housing (7) includes an annular lower housing groove (73) on the bottom surface of the lower housing (7). The valve body (9) includes an annular upper body groove (93) on its top surface, and The annular lower housing groove (73) is radially aligned with the annular upper body groove (93) and is used to receive the body seal (201).

12. A battery pack, comprising: Battery casing; At least one battery cell disposed within the battery casing ； According to claim 1, the explosion-proof ventilation valve (200) is installed on the battery housing.

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