Explosion-proof ventilation valve device

Abstract

An explosion-proof vent valve (100) for a battery pack, comprising: a protective cover (1); the cover seat (3) is jointed with the protective cover (1); and a water-impermeable and gas-permeable membrane (2), said membrane (2) being arranged below the protective cover (1). The explosion-proof vent valve (100) further comprises: a valve body (5) configured to be connected with a housing of the battery pack; the self-locking mechanism is arranged on the cover seat (3); the protective cover (1), the cover seat (3), the membrane (2) and the self-locking mechanism form a cover assembly (110), and the cover assembly (110) defines a ventilation channel; and a filter element (8) housed in the valve body (5), the filter element (8) and the valve body (5) defining a valve passage.

Description

Technical Field

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

[0002] Typically, during the operation of electric vehicles, significant pressure differences exist between the inside and outside of the battery pack due to variations in altitude and ambient temperature. If this pressure difference is not balanced in a timely manner, the battery pack may experience compression deformation, expansion, or even bursting under the influence of this pressure difference. In some cases, thermal runaway of the battery cells inside the battery pack will release a large amount of gas. If this gas is not promptly vented to the outside of the battery pack, the internal pressure will rise sharply within a short period, leading to battery pack bursting or even exploding, which will compromise passenger safety.

[0003] Therefore, an explosion-proof ventilation valve needs to be installed at the outer end of the battery pack to equalize pressure, reduce the impact of water condensation on the battery pack, and provide explosion-proof functionality in emergency conditions. Most existing explosion-proof ventilation valves use a single area with overall ventilation and explosion-proof functions; however, contaminants on the covering membrane (such as dirt, dust, and accumulated water) can easily clog the membrane, potentially causing it to lose its permeability.

[0004] Batteries release a large amount of heat during thermal runaway events. Chemical reactions exist between the positive and negative electrodes inside the battery, and these reactions become extremely violent when the battery is short-circuited or overcharged, causing a rapid rise in the internal temperature. Once the battery's thermal limit is exceeded, it burns, releasing a significant amount of heat. Simultaneously, the electrolyte in the battery typically contains substances such as organic solvents and fluorides, which decompose to produce toxic gases such as fluorides, cyanides, and carbon monoxide. These toxic gases are harmful to human health, and inhalation of excessive amounts can lead to poisoning or even suffocation. Materials inside the battery, including potassium salts and lithium manganese oxide, 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 battery casing is usually made of metallic materials such as aluminum, cobalt, and manganese, and when the battery explodes, the casing may rupture, releasing metal fragments. These fragments can not only cause injury but also potentially ignite secondary fires.

[0005] Therefore, it is desirable to develop an explosion-proof ventilation valve that is simple in structure, integrates filtration function, and can work reliably under different operating conditions. Summary of the Invention

[0006] 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.

[0007] In one aspect, an explosion-proof ventilation valve for a battery pack is provided. The explosion-proof ventilation valve includes: Protective cover; A cover mount that engages with the protective cover; A water-impermeable but gas-permeable membrane, the membrane being disposed below a protective cover; A valve body configured to connect to the battery pack housing; A self-locking mechanism disposed on a cover seat; a protective cover, cover seat, membrane, and self-locking mechanism forming a cover assembly, the cover assembly defining a ventilation channel; and A filter element housed in a valve body, the filter element and the valve body together defining a valve passage; The self-locking mechanism is configured to engage with a corresponding locking structure on the valve body when the internal pressure of the battery pack is equal to or less than the ambient pressure, or when the internal pressure of the battery pack is greater than the ambient pressure but the pressure difference between the internal pressure of the battery pack and the ambient pressure is less than a predetermined threshold, thereby fixing the cover assembly relative to the valve body and allowing gas exchange between the inside of the battery pack and the environment via both the valve channel and the ventilation channel. The self-locking mechanism is configured to disengage from the corresponding locking structure on the valve body when the internal pressure of the battery pack is greater than the ambient pressure and the pressure difference between the internal pressure of the battery pack and the ambient pressure rises above a predetermined threshold, thereby releasing the cover assembly from the valve body and allowing pressure release only through the valve channel and not through the ventilation channel.

[0008] The valve body may include a hollow body portion and a flange portion extending outward from the body portion. The flange portion may have a first circumferential sealing groove on its lower surface for receiving a first seal configured to seal between the valve body and the battery pack.

[0009] The main body may have threads on its outer surface to engage with corresponding threads on the battery pack.

[0010] The flange portion may be provided with multiple threaded holes so that the valve body can be fixed to the battery pack by screws.

[0011] The inner surface of the valve body or the outer surface of the cover may be provided with a second circumferential sealing groove for receiving a second seal configured to seal between the valve body and the cover.

[0012] The explosion-proof ventilation valve may also include a filter mounting plate, the filter element being disposed on the filter mounting plate, and the main body portion having a circumferential lip at its lower end, the circumferential lip extending radially inward from the inner surface of the main body portion and supporting the filter mounting plate.

[0013] The explosion-proof ventilation valve may also include a filter seal disposed between the filter element and the valve body.

[0014] The filter seal can be selected from the group including sealing rings, one-piece injection molded seal structures, 2K injection molded seal structures and foamed seal structures.

[0015] The filter element may be selected from the group consisting of origami structure, corrugated structure, and honeycomb structure.

[0016] The filter element may have a circular or square cross-section, and the valve body may have an opening with a corresponding cross-section to accommodate the filter element.

[0017] The self-locking mechanism may include a biasing spring and a ball locking assembly, wherein the ball locking assembly may include: The hollow cylindrical body component of the central ventilation channel of the locking mechanism is defined, and the membrane can be set on the top surface of the body component; A support flange, extending circumferentially around the outer side of the body member, is used to support the bias spring; and A plurality of ball seat cavities are distributed circumferentially around the body component, each of the plurality of ball seat cavities being in fluid communication with the central ventilation channel of the locking mechanism and configured to accommodate the locking ball.

[0018] The cover may include a tapered portion located at its lower part and at least one through hole extending through the sidewall of the cover and in fluid communication with the plurality of ball seat cavities.

[0019] The valve body may include a protrusion extending upward from the center of the valve body, the protrusion being provided with an arcuate groove extending circumferentially around the protrusion or a plurality of partially spherical recesses circumferentially aligned with the plurality of ball seat cavities for engagement with a locking ball.

[0020] The ball locking assembly may further include a third circumferential sealing groove located below the support flange for receiving a third seal configured to seal between the ball locking assembly and the cover.

[0021] The cover may include: a horizontally extending hollow first portion on which a membrane is disposed; a cylindrical second portion extending vertically downward around the first portion and configured to engage with a valve body; and a lip portion extending vertically upward around the first portion in at least part.

[0022] The protective cover may include a top wall, a plurality of snap-fit ​​holes distributed circumferentially around the top wall, and a plurality of first positioning structures located radially inside the snap-fit ​​holes.

[0023] The cover may further include: a plurality of snap-locking lugs circumferentially aligned with the plurality of snap-lock holes and extending upward from a first portion; and a plurality of second positioning structures located radially inside the snap-locking lugs and configured to support the protective cover. After the snap-locking lugs are engaged with the plurality of snap-lock holes, the first positioning structures and the second positioning structures cooperate to hold the protective cover and the cover in place.

[0024] The first positioning structure can be a straight wall extending vertically downward from the top wall, and the second positioning structure can be a straight wall extending vertically upward from the first part. After the latching lug is engaged with the plurality of latching holes, the second positioning structure is adjacent to the first positioning structure and supports the protective cover.

[0025] The protective cover may also include multiple positioning recesses, which are circumferentially distributed around the top wall and circumferentially offset from the snap-fit ​​holes.

[0026] The cover may also include a plurality of spacers circumferentially aligned with the plurality of positioning recesses and extending upward from the first portion. The spacers have a height greater than the height of the lip portion plus the depth of the positioning recesses, so as to define a ventilation gap between the protective cover and the cover.

[0027] The explosion-proof ventilation valve of this application has a simple structure, integrated filtration function, and can work reliably under different operating conditions.

[0028] With the help of filter elements, toxic gases, particulate matter and / or metal fragments can be reliably filtered out when the battery pack explodes.

[0029] With the help of a self-locking mechanism, the cover assembly is reliably fixed relative to the valve body when the battery pack is in normal operation, thereby allowing gas exchange between the battery pack's interior and the environment via both the valve channel and the ventilation channel, ensuring the normal operation of the battery pack. When the internal pressure of the battery pack exceeds the ambient pressure and the pressure difference between the battery pack's interior and the ambient pressure rises above a predetermined threshold, the cover assembly releases from the valve body, allowing pressure release only through the valve channel and not through the ventilation channel, thereby reducing the resistance of the explosion-proof ventilation valve itself and achieving rapid pressure release of the battery pack.

[0030] The spring constant of the bias spring can be adjusted for different application scenarios and emergency release requirements of internal pressure, thus exhibiting excellent scalability.

[0031] The protective cover and cover seat can be precisely positioned with the aid of the first positioning structure and the second positioning structure.

[0032] 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

[0033] This disclosure will be more fully understood from the detailed description and accompanying drawings.

[0034] Figure 1 This is a schematic exploded view of an example explosion-proof ventilation valve according to an embodiment.

[0035] Figure 2 yes Figure 1 A schematic top view of an explosion-proof ventilation valve.

[0036] Figure 3 yes Figure 1 Explosion-proof ventilation valve along Figure 2 The schematic cross-sectional view of section line AA in the figure shows that the filter element is configured as a square cross-section origami structure, and the filter seal for the filter element is configured as a 2K (two-component) injection molded seal structure.

[0037] Figure 4 This is a schematic perspective view of an example filter element, wherein the filter element is configured as a square cross-section origami structure.

[0038] Figure 5 This is a schematic perspective view of another example filter element, in which the filter element is configured as a circular cross-section origami structure.

[0039] Figure 6 This is a schematic perspective view of another example filter element, in which the filter element is configured as a square cross-section honeycomb structure.

[0040] Figure 7 This is a schematic perspective view of another example filter element, in which the filter element is configured as a square cross-section corrugated structure.

[0041] Figure 8 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 5 The circular cross-section origami structure shown is used, and the filter seal for the filter element is configured as a sealing ring.

[0042] Figure 9 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 4 The square cross-section origami structure shown is used, and the filter seal for the filter element is configured as a foam seal structure.

[0043] Figure 10 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 4The square cross-section origami structure shown is used, and the filter seal for the filter element is configured as an integral injection seal structure.

[0044] Figure 11 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 7 The square cross-section corrugated structure shown is used, and the filter seal for the filter element is configured as a 2K injection-molded seal structure.

[0045] Figure 12 This is a schematic exploded view of another example explosion-proof ventilation valve according to an embodiment.

[0046] Figure 13 yes Figure 12 A schematic top view of an explosion-proof ventilation valve.

[0047] Figure 14 yes Figure 12 Explosion-proof ventilation valve along Figure 13 A schematic cross-sectional view of section line BB in the figure, wherein the filter element is configured as a circular cross-section origami structure, and the filter seal for the filter element is configured as a sealing ring.

[0048] Figure 15 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 5 The square cross-section origami structure shown is used, and the filter seal for the filter element is configured as a sealing ring.

[0049] Figure 16 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the filter element is configured as such Figure 4 The square cross-section origami structure shown is used, and the filter seal for the filter element is configured as a foam seal structure.

[0050] Figure 17 This is a schematic perspective view of another example filter element, in which the filter element is configured as a circular cross-section honeycomb structure.

[0051] Figure 18 This is a schematic perspective view of another example filter element, in which the filter element is configured as a square cross-section origami structure.

[0052] Figure 19 This is a schematic exploded view of another example explosion-proof ventilation valve according to an embodiment.

[0053] Figure 20 yes Figure 19 A schematic top view of an explosion-proof ventilation valve.

[0054] Figure 21 This is a schematic perspective view of an example self-locking mechanism according to an embodiment.

[0055] Figure 22 yes Figure 21 A schematic cross-sectional view of the self-locking mechanism.

[0056] Figure 23 yes Figure 19 Explosion-proof ventilation valve along Figure 20 A schematic cross-sectional view of the section line CC in the figure, wherein the filter element is configured as a circular cross-section origami structure, and the filter seal for the filter element is configured as a sealing ring, wherein the explosion-proof ventilation valve is in the normal intake state.

[0057] Figure 24 yes Figure 19 Explosion-proof ventilation valve along Figure 20 A schematic cross-sectional view of the cross-section line CC in the diagram, wherein the filter element is configured as a circular cross-section origami structure, and the filter seal for the filter element is configured as a sealing ring, wherein the explosion-proof ventilation valve is in the normal exhalation state.

[0058] Figure 25 This is a schematic cross-sectional view of an example explosion-proof ventilation valve according to an embodiment, wherein the explosion-proof ventilation valve is in a burst state. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] Furthermore, terms such as "first," "second," and "third" may be used to describe individual components. Such terms are used descriptively in the accompanying drawings and do not constitute a limitation on the scope of this disclosure as defined by the appended claims.

[0062] Referring now to the accompanying drawings, in which the same reference numerals refer to the same features throughout the various views. Figure 1 This is a schematic exploded view of an example explosion-proof ventilation valve 100 according to an embodiment. Figure 2 yes Figure 1 A schematic top view of the explosion-proof ventilation valve 100. Figure 3 yes Figure 1 Explosion-proof ventilation valve 100 Figure 2 The schematic cross-sectional view of section line AA in the figure shows that the filter element 8 is configured as a square cross-section origami structure, and the filter seal 10 for the filter element is configured as a 2K injection seal structure.

[0063] According to one example, the explosion-proof ventilation valve 100 may include: a protective cover 1; a cover seat 3 engaging with the protective cover 1; and a water-impermeable but gas-permeable membrane 2 disposed below the protective cover 1. The membrane 2 may be formed of a microporous material. The micropores in the material allow gas to pass through the membrane but prevent moisture from passing through. In particular, the membrane 2 may be formed of, for example, perfluorosulfonic acid; however, as those skilled in the art will understand, the membrane 2 may be formed of any other suitable material as needed without departing from the scope of this disclosure.

[0064] According to one example, a self-locking mechanism is provided on the cover seat 3. The protective cover 1, cover seat 3, membrane 2, and self-locking mechanism form a cover assembly 110. The cover assembly 110 defines a ventilation channel, such as... Figure 23 and Figure 24 As indicated by the arrow in the upper part. According to one example, the self-locking mechanism can take the form of a snap ring 7. However, as those skilled in the art will understand, the self-locking mechanism can take any other suitable form, such as... Figure 12 As shown, without departing from the scope of this disclosure.

[0065] According to one example, the retaining ring 7 may include a plurality of threaded holes 72 for securing the retaining ring 7 to the cover 3 via screws. Figure 1 Four threaded holes 72 are shown. However, as those skilled in the art will understand, the snap ring 7 may include any other suitable number of threaded holes, such as 3, 5, etc., without departing from the scope of this disclosure. Furthermore, as those skilled in the art will understand, the snap ring 7 may employ any other suitable connection type, such as welding, without departing from the scope of this disclosure.

[0066] According to one example, the retaining ring 7 may include at least one retaining ring vent 71, thereby allowing gas exchange between the interior of the battery pack and the environment. The retaining ring vent 71 can be located at any suitable position.

[0067] According to one example, the retaining ring 7 may include a plurality of resilient clips 74 to secure the retaining ring 7 to the valve body 5. The resilient clips 74 are slidable across corresponding protrusions 54 on the valve body 5 and engage with corresponding circumferential grooves on the protrusions 54. Although Figure 1 Two opposing resilient clips 74 are shown, but as those skilled in the art will understand, the snap ring 7 may include any other suitable number of resilient clips 74, such as 3, 4, etc., without departing from the scope of this disclosure.

[0068] According to one example, the explosion-proof ventilation valve 100 may include a valve body 5 configured to connect to the housing of the battery pack. Figure 3 As shown, the valve body 5 may include a hollow body portion 51 and a flange portion 52 extending outward from the body portion 51. The flange portion 52 has a first circumferential sealing groove 53 on its lower surface for receiving a first seal 6 configured to seal between the valve body 5 and the battery pack.

[0069] According to one example, the main body portion 51 may be threaded on its outer surface to engage with corresponding threads on the battery pack to secure the valve body 5 to the battery pack. However, as those skilled in the art will understand, the valve body 5 may employ any other suitable connection type without departing from the scope of this disclosure. As an example, such as Figure 12 As shown, the flange portion 52 is provided with a plurality of threaded holes 59 for securing the valve body 5 to the battery pack via screws.

[0070] According to one example, the inner surface of the valve body 5 or the outer surface of the cover 3 may be provided with a second circumferential sealing groove 39 for receiving a second seal 4 configured to seal between the valve body 5 and the cover 3.

[0071] According to one example, the cover 3 may include: a horizontally extending hollow first portion 33 on which the membrane 2 is disposed; a cylindrical second portion 35 extending vertically downward around the first portion 33 and configured to engage with the valve body 5; and a lip portion 36 extending at least partially vertically upward around the first portion 33. The membrane 2 may be welded to or bonded to the first portion 33. As will be understood by those skilled in the art, the membrane 2 may be disposed on the first portion 33 in any other suitable manner without departing from the scope of this disclosure.

[0072] The protective cover 1 may include a top wall, a plurality of snap holes 11 distributed circumferentially around the top wall, and a plurality of first positioning structures 14 located radially inside the snap holes 11;

[0073] The cover 3 may also include a plurality of snap-locking lugs 31 circumferentially aligned with the plurality of snap-locking holes 11 and extending upward from the first portion 33; and a plurality of second positioning structures 34 located radially inside the snap-locking lugs 31 and configured to support the protective cover 1. After the snap-locking lugs 31 engage with the plurality of snap-locking holes 11, the first positioning structure 14 and the second positioning structure 34 cooperate to hold the protective cover 1 and the cover 3 in place. Figure 1 Two opposing snap-locking lugs 31 and two opposing snap-locking holes 11 are shown. However, as those skilled in the art will understand, any other suitable number of snap-locking lugs 31 and snap-locking holes 11 may be present without departing from the scope of this disclosure.

[0074] The first positioning structure 14 is a straight wall extending vertically downward from the top wall, and the second positioning structure 34 is a straight wall extending vertically upward from the first part 33. After the latching lug 31 is engaged with the multiple latching holes 11, the second positioning structure 34 abuts against the first positioning structure 14 and supports the protective cover 1.

[0075] The protective cover 1 may further include a plurality of positioning recesses 12 circumferentially distributed around the top wall and circumferentially offset from the snap-fit ​​holes 11. The cover seat 3 may further include a plurality of spacers 32 circumferentially aligned with the plurality of positioning recesses 12 and extending upward from the first portion 33. The spacers 32 have a height greater than the height of the lip portion 36 plus the depth of the positioning recesses 12, thereby defining a ventilation gap 18 between the protective cover 1 and the cover seat 3. However, as those skilled in the art will understand, the ventilation gap 18 may be omitted, and the protective cover 1 may include at least one ventilation hole in the top wall without departing from the scope of this disclosure.

[0076] like Figure 1 As shown, except where the multiple spacers 32 and the second positioning structure 34 are provided, the lip portion 36 extends circumferentially around the first portion 33. However, as those skilled in the art will understand, the lip portion 36 may extend circumferentially less than... Figure 1 The scope of the disclosure is such that, for example, a gap is left between the lip portion 36 and the plurality of spacers 32 or the second positioning structure 34, without departing from the scope of the disclosure.

[0077] In one example, filter element 8 is housed within valve body 5. Filter element 8 and valve body 5 together define a valve passage, as shown below. Figure 23 and Figure 24 As indicated by the arrow in the lower part. With the help of filter element 8, toxic gases, particulate matter, and / or metal fragments can be reliably filtered out in the event of a battery pack explosion.

[0078] The filter element 8 can be selected from the group including origami structure, corrugated structure and honeycomb structure. In addition, the filter element 8 can have a circular cross section or a square cross section, and the valve body 5 is provided with an opening of the corresponding cross section to accommodate the filter element 8. Figure 4 This is a schematic perspective view of an example filter element 8, wherein the filter element 8 is configured as a square cross-section origami structure. Figure 5 This is a schematic perspective view of another example filter element 8, wherein the filter element 8 is configured as a circular cross-section origami structure. Figure 6 This is a schematic perspective view of another example filter element 8, wherein the filter element 8 is configured as a square cross-section honeycomb structure. Figure 7 This is a schematic perspective view of another example filter element 8, wherein the filter element 8 is configured as a square cross-section corrugated structure. However, as those skilled in the art will understand, the filter element 8 may take any other suitable type and may have any other suitable cross-section shape without departing from the scope of this disclosure.

[0079] The explosion-proof ventilation valve 100 may further include a filter mounting plate 9, which has at least one hole as part of a valve passage. A filter element 8 is disposed on the filter mounting plate 9. A circumferential lip 55 is provided at its lower end of the body portion 51. The circumferential lip 55 extends radially inward from the inner surface of the body portion 51 and supports the filter mounting plate 9. Alternatively, the filter mounting plate 9 may be omitted or integrated into the filter element 8 without departing from the scope of this disclosure.

[0080] The explosion-proof ventilation valve 100 may further include a filter seal 10 disposed between the filter element 8 and the valve body 5. The filter seal 10 may be selected from the group consisting of sealing rings, integral injection-molded seals, 2K injection-molded seals, and foam seals. However, as those skilled in the art will understand, the filter seal 10 may take any other suitable form without departing from the scope of this disclosure.

[0081] The self-locking mechanism is configured to engage with a corresponding locking structure on the valve body 5 when the internal pressure of the battery pack is equal to or less than the ambient pressure, or when the internal pressure of the battery pack is greater than the ambient pressure but the pressure difference between the internal pressure of the battery pack and the ambient pressure is less than a predetermined threshold. This engages with the corresponding locking structure on the valve body 5 to fix the cover assembly 110 relative to the valve body 5 and allows gas exchange between the inside of the battery pack and the environment via both the valve passage and the ventilation passage, such as, for example... Figure 23 and Figure 24As shown in the diagram, the self-locking mechanism is configured to disengage from the corresponding locking structure on the valve body 5 when the internal pressure of the battery pack is greater than the ambient pressure and the pressure difference between the internal pressure of the battery pack and the ambient pressure rises above a predetermined threshold. This releases the cover assembly 110 from the valve body 5 and allows pressure release only through the valve passage and not through the ventilation passage, such as, for example... Figure 25 As shown in the image.

[0082] Figure 8 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 5 The circular cross-section origami structure shown is used, and the filter seal 10 for the filter element 8 is configured as a sealing ring.

[0083] Figure 9 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 4 The square cross-section origami structure shown is used, and the filter seal 10 for the filter element 8 is configured as a foam seal structure.

[0084] Figure 10 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 4 The square cross-section origami structure shown is used, and the filter seal 10 for the filter element 8 is configured as an integral injection-molded seal structure.

[0085] Figure 11 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 7 The square cross-section corrugated structure shown is used, and the filter seal 10 for the filter element 8 is configured as a 2K injection molded seal structure.

[0086] Figure 12 This is a schematic exploded view of another example of an explosion-proof ventilation valve 100 according to an embodiment. Figure 13 yes Figure 12 A schematic top view of the explosion-proof ventilation valve 100. Figure 14 yes Figure 12 Explosion-proof ventilation valve 100 Figure 13 The schematic cross-sectional view of section line BB in the figure shows that the filter element 8 is configured as a circular cross-section origami structure, and the filter seal 10 for the filter element 8 is configured as a sealing ring.

[0087] In addition to the self-locking mechanism Figure 12 The explosion-proof ventilation valve 100 can be used with Figure 1 The explosion-proof ventilation valve 100 is the same. For the sake of brevity, details about... Figure 12 Description of other components.

[0088] As an example, such as Figure 12 As shown, the flange portion 52 is provided with a plurality of threaded holes 59 for securing the valve body 5 to the battery pack via screws. However, as those skilled in the art will understand, the valve body 5 may employ any other suitable connection type without departing from the scope of this disclosure.

[0089] according to Figure 12 In some embodiments, the self-locking mechanism may include a bias spring 111 and a ball locking assembly 101. Figure 21 yes Figure 12 A schematic perspective view of an example self-locking mechanism. Figure 22 yes Figure 12 A schematic cross-sectional view of the self-locking mechanism.

[0090] like Figure 21 and Figure 22 As shown, the ball locking assembly 101 may include: a hollow cylindrical body member 104 defining a central ventilation channel 105 of the locking mechanism; a support flange 107 extending circumferentially around the outer side of the body member 104 for supporting a bias spring 111; and a plurality of ball seat cavities 102 circumferentially distributed around the body member 104, each of the plurality of ball seat cavities 102 being in fluid communication with the central ventilation channel 105 of the locking mechanism and configured to receive a locking ball 103. The bias spring 111 is disposed between the protective cover 1 and the support flange 107 and configured to bias the ball locking assembly 101 against the valve body 5. The spring constant of the bias spring 111 can be adjusted for different application scenarios and emergency release requirements of internal pressure, thus exhibiting excellent scalability.

[0091] According to one example, the membrane 2 is disposed on the top surface of the body member 104. However, as those skilled in the art will understand, the membrane 2 can be disposed in any other suitable location, such as on a flange disposed in the cover 3, without departing from the scope of this disclosure. The membrane 2 can be welded to or bonded to the body member 104. As those skilled in the art will understand, the membrane 2 can be disposed on the body member 104 in any other suitable manner without departing from the scope of this disclosure.

[0092] The ball locking assembly 101 may also include a third circumferential sealing groove 106 located below the support flange 107 for receiving a third seal 76 configured to seal between the ball locking assembly 101 and the cover 3. However, as those skilled in the art will understand, the third seal 76 may be located in any other suitable position without departing from the scope of this disclosure.

[0093] The cover 3 may include a tapered portion 37 located in its lower portion and at least one through hole 38 extending through the sidewall of the cover 3 and in fluid communication with a plurality of ball seat cavities 102.

[0094] The valve body 5 includes a protrusion 58 extending upward from the center of the valve body 5. The protrusion 58 is provided with an arcuate groove extending circumferentially around the protrusion 58 or a plurality of partially spherical recesses circumferentially aligned with a plurality of ball seat cavities 102 for engagement with a locking ball 103.

[0095] In addition to the tapered portion 37 and at least one through hole 38, the cover 3 can be connected with Figure 1 The same as shown. For example, the cover 3 may include: a horizontally extending hollow first portion 33, on which the membrane 2 is disposed; and a cylindrical second portion 35 extending vertically downward around the first portion 33. The cover 3 may include a cylindrical third portion 131 extending vertically upward from the inside of the first portion 33.

[0096] The protective cover 1 may be a flat disc with ventilation holes. The protective cover 1 may be welded to the top surface of the third part 131; however, as those skilled in the art will understand, the protective cover 1 may be attached to the third part 131 in any other suitable manner without departing from the scope of this disclosure.

[0097] Figure 15 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 5 The square cross-section origami structure shown is used, and the filter seal 10 for the filter element 8 is configured as a sealing ring.

[0098] Figure 16 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the filter element 8 is configured as such Figure 4 The square cross-section origami structure shown is used, and the filter seal 10 for the filter element 8 is configured as a foam seal structure.

[0099] Figure 17 This is a schematic perspective view of another example filter element 8, wherein the filter element 8 is configured as a circular cross-section honeycomb structure. Figure 18 This is a schematic perspective view of another example filter element 8, wherein the filter element 8 is configured as a square cross-section origami structure.

[0100] Figure 19 This is a schematic exploded view of another example of an explosion-proof ventilation valve 100 according to an embodiment. Figure 20 yes Figure 19A schematic top view of the explosion-proof ventilation valve 100. Except that the main body 51 has threads on its outer surface and the flange portion 52 does not have threaded holes, Figure 1 The explosion-proof ventilation valve 100 can be used with Figure 12 The explosion-proof ventilation valve 100 is the same. For the sake of brevity, details about... Figure 19 Description of other components.

[0101] According to one example, the body portion 51 may be threaded on its outer surface to engage with corresponding threads on the battery pack to secure the valve body 5 to the battery pack. However, as those skilled in the art will understand, the valve body 5 may employ any other suitable connection type without departing from the scope of this disclosure.

[0102] Figure 23 yes Figure 19 Explosion-proof ventilation valve 100 Figure 20 A schematic cross-sectional view of the cross-section line CC in the diagram, wherein the filter element 8 is configured as a circular cross-section origami structure, and the filter seal 10 for the filter element 8 is configured as a sealing ring, wherein the explosion-proof ventilation valve is in the normal air intake state.

[0103] Figure 24 yes Figure 19 Explosion-proof ventilation valve 100 Figure 20 A schematic cross-sectional view of the cross-section line CC in the figure, wherein the filter element 8 is configured as a circular cross-section origami structure, and the filter seal 10 for the filter element 8 is configured as a sealing ring, wherein the explosion-proof ventilation valve is in the normal exhalation state.

[0104] Figure 25 This is a schematic cross-sectional view of an example explosion-proof ventilation valve 100 according to an embodiment, wherein the explosion-proof ventilation valve 100 is in a burst state. Figure 25 As shown, the cover assembly 110 is released from the valve assembly 112, which includes the valve body 5 and the filter element 8.

[0105] The operation of the explosion-proof ventilation valve 100 is now described. When the battery pack is in normal operating condition, the bias spring 111 biases the ball locking assembly 101 against the tapered portion 37, and each locking ball 103 engages with an arcuate groove or multiple partially spherical recesses, thereby securing the cover assembly 110 relative to the valve body 5 and allowing gas exchange between the interior of the battery pack and the environment via both the valve passage and the ventilation passage, such as, for example Figure 23 and Figure 24 As shown in the image.

[0106] When the internal pressure of the battery pack is lower than the ambient pressure, the explosion-proof ventilation valve 100 is in normal intake mode. Ambient gas flows into the battery pack through both the valve channel and the ventilation channel, thus entering the battery pack interior. Figure 23 As shown in the image.

[0107] When the internal pressure of the battery pack is greater than the ambient pressure, but the pressure difference between the inside and outside of the battery pack is less than a predetermined threshold that can overcome the bias spring force of the bias spring 111, the explosion-proof ventilation valve 100 is in normal exhalation mode, and the gas inside the battery pack will flow out of the battery pack through both the valve channel and the ventilation channel. Figure 24 As shown in the image.

[0108] When the internal pressure of the battery pack exceeds the ambient pressure and the pressure difference between the inside and outside of the battery pack rises above a predetermined threshold, the explosion-proof ventilation valve 100 bursts. The pressure difference overcomes the biasing force of the bias spring 111, thereby pushing the ball locking assembly 101 away from the conical portion 37, and each locking ball 103 disengages from the arcuate groove or multiple partially spherical recesses. The cover assembly 110 pops open from the valve assembly 112, which includes the valve body 5 and the filter element 8, and the gas inside the battery pack can be rapidly released to the surrounding environment only through the valve passage, without passing through the ventilation passage, such as... Figure 25 As shown in the image.

[0109] The explosion-proof ventilation valve 100 of this application has a simple structure, integrated filtration function, and can work reliably under different operating conditions.

[0110] With a self-locking mechanism, the cover assembly 110 is reliably fixed relative to the valve body 5 when the battery pack is in normal operation, thereby allowing gas exchange between the battery pack interior and the environment via both the valve channel and the ventilation channel, ensuring normal operation of the battery pack. When the internal pressure of the battery pack is greater than the ambient pressure and the pressure difference between the battery pack interior and the ambient pressure rises above a predetermined threshold, the cover assembly 110 is released from the valve body 5, allowing pressure release only through the valve channel and not through the ventilation channel, thereby reducing the resistance of the explosion-proof ventilation valve itself and achieving rapid pressure release of the battery pack.

[0111] The protective cover 1 and the cover base 3 can be precisely positioned with the aid of the first positioning structure 14 and the second positioning structure 34.

[0112] 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 (100) for a battery pack, the explosion-proof ventilation valve (100) comprising: Protective cover (1); Cover seat (3) that engages with the protective cover (1); A water-impermeable but gas-permeable membrane (2) is disposed below the protective cover (1); A valve body (5) configured to connect to the housing of the battery pack; A self-locking mechanism is provided on the cover seat (3) to protect the cover (1), cover seat (3), membrane (2) and self-locking mechanism to form a cover assembly (110), the cover assembly (110) defining a ventilation channel; as well as A filter element (8) is housed in a valve body (5), and the filter element (8) and the valve body (5) define a valve passage; The self-locking mechanism is configured as follows: When the internal pressure of the battery pack is equal to or less than the ambient pressure, or when the internal pressure of the battery pack is greater than the ambient pressure but the pressure difference between the internal pressure of the battery pack and the ambient pressure is less than a predetermined threshold, it engages with the corresponding locking structure on the valve body (5), thereby fixing the cover assembly (110) relative to the valve body (5) and allowing gas exchange between the inside of the battery pack and the environment via both the valve passage and the ventilation passage; and When the internal pressure of the battery pack is greater than the ambient pressure and the pressure difference between the internal pressure of the battery pack and the ambient pressure is greater than a predetermined threshold, the corresponding locking structure on the valve body (5) is disengaged, thereby releasing the cover assembly (110) from the valve body (5) and allowing pressure release only through the valve channel and not through the ventilation channel.

2. The explosion-proof ventilation valve (100) according to claim 1, wherein, The valve body (5) includes a hollow body portion (51) and a flange portion (52) extending outward from the hollow body portion (51). The flange portion (52) includes a first circumferential sealing groove (53) on its lower surface. The first circumferential sealing groove (53) is configured to receive a first seal (6) configured to seal between the valve body (5) and the battery pack.

3. The explosion-proof ventilation valve (100) according to claim 2, wherein, The hollow body portion (51) includes threads on its outer surface, the threads being configured to engage with corresponding threads on the battery pack.

4. The explosion-proof ventilation valve (100) according to claim 2, wherein, The flange portion (52) includes a plurality of threaded holes (59) configured to secure the valve body (5) to the battery pack via screws.

5. The explosion-proof ventilation valve (100) according to claim 2, wherein, The inner surface of the valve body (5) or the outer surface of the cover (3) includes a second circumferential sealing groove (39) configured to receive a second seal (4) configured to seal between the valve body (5) and the cover (3).

6. The explosion-proof ventilation valve (100) according to claim 2 further includes a filter mounting plate (9), wherein the filter element (8) is disposed on the filter mounting plate (9), and the hollow main body portion (51) includes a circumferential lip (55) at its lower end, the circumferential lip (55) extending radially inward from the inner surface of the main body portion (51) and supporting the filter mounting plate (9).

7. The explosion-proof ventilation valve (100) according to claim 1 further includes a filter seal (10) disposed between the filter element (8) and the valve body (5).

8. The explosion-proof ventilation valve (100) according to claim 7, wherein, The filter seal (10) is selected from the group including sealing rings, integral injection molding seal structure, 2K injection molding seal structure and foam seal structure.

9. The explosion-proof ventilation valve (100) according to claim 1, wherein, The filter element (8) is selected from the group consisting of origami structure, corrugated structure and honeycomb structure.

10. The explosion-proof ventilation valve (100) according to claim 1, wherein, The filter element (8) has a circular or square cross-section, and The valve body (5) includes an opening with a corresponding cross section, the opening accommodating a filter element (8).

11. The explosion-proof ventilation valve (100) according to claim 5, wherein, The self-locking mechanism includes a bias spring (111) and a ball locking assembly (101), the ball locking assembly (101) comprising: The hollow cylindrical body component (104) of the central ventilation channel (105) of the locking mechanism is defined, and the membrane (2) is disposed on the top surface of the hollow cylindrical body component (104). A support flange (107) extends circumferentially around the outer side of the hollow cylindrical body member (104), and the support flange (107) supports the bias spring (111); and A plurality of ball seat cavities (102) are circumferentially distributed around the hollow cylindrical body component (104), each of the plurality of ball seat cavities (102) being in fluid communication with the central ventilation channel (105) of the locking mechanism and configured to accommodate a locking ball (103). The cover (3) includes a tapered portion (37) located at its lower part and at least one through hole (38), the at least one through hole (38) extending through the sidewall of the cover (3) and in fluid communication with the plurality of ball seat cavities (102), and The valve body (5) includes a protrusion (58) extending upward from the center of the valve body (5), the protrusion (58) including an arcuate groove extending circumferentially around the protrusion (58) or a plurality of partially spherical recesses circumferentially aligned with the plurality of ball seat cavities (102) for engagement with the locking ball (103).

12. The explosion-proof ventilation valve (100) according to claim 11, wherein, The ball locking assembly (101) further includes a third circumferential sealing groove (106) located below the support flange (107), the third circumferential sealing groove (106) being configured to receive a third seal (76) configured to seal between the ball locking assembly (101) and the cover (3).

13. The explosion-proof ventilation valve (100) according to claim 2, wherein, The cover (3) includes: A horizontally extending hollow first part (33), on which a membrane (2) is disposed; A cylindrical second part (35) extends vertically downward around the hollow first part (33) and is configured to engage with the valve body (5); and The lip portion (36) extends vertically upwards at least partially around the hollow first part (33). The protective cover (1) includes: Top wall; Multiple snap-fit ​​holes (11) are distributed circumferentially around the top wall; and Multiple first positioning structures (14) located radially inside the snap hole (11), and The cover (3) also includes: Multiple locking lugs (31) are circumferentially aligned with the multiple locking holes (11) and extend upward from the hollow first portion (33); and Multiple second positioning structures (34) are located radially inside the multiple snap-locking lugs (31) and configured to support the protective cover (1). After the multiple snap-locking lugs (31) are engaged with the multiple snap-locking holes (11), the multiple first positioning structures (14) and the multiple second positioning structures (34) cooperate to hold the protective cover (1) and the cover seat (3) in place.

14. The explosion-proof ventilation valve (100) according to claim 13, wherein, Each of the plurality of first positioning structures (14) is a straight wall extending vertically downward from the top wall. Each of the plurality of second positioning structures (34) is a straight wall extending vertically upward from the hollow first portion (33), and After the plurality of latching lugs (31) are engaged with the plurality of latching holes (11), each of the plurality of second positioning structures (34) abuts against the corresponding one of the plurality of first positioning structures (14) and supports the protective cover (1).

15. The explosion-proof ventilation valve (100) according to claim 14, wherein, The protective cover (1) also includes a plurality of positioning recesses (12), which are circumferentially distributed around the top wall and circumferentially offset from the plurality of snap-fit ​​holes (11). The cover (3) also includes a plurality of spacers (32) circumferentially aligned with the plurality of positioning recesses (12) and extending upward from the hollow first portion (33). Each of the plurality of spacers (32) has a height greater than the height of the lip portion (36) plus the depth of the plurality of positioning recesses (12) in order to define a ventilation gap (18) between the protective cover (1) and the cover (3).

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