Breathable valve cover, explosion-proof valve, battery pack and vehicle

Abstract

The utility model discloses a ventilation valve cover, explosion-proof valve, battery pack and vehicle, ventilation valve cover includes flexible cover, support cylinder and movable piece, the inner edge of flexible cover is connected with support cylinder, the outer edge of flexible cover can generate elastic deformation along the first direction, the support cylinder has ventilation channel, and the movable piece is connected with the flexible cover. One part of the movable piece is connected to the inner wall of the supporting cylinder, the other part of the movable piece is used for at least partially shielding the ventilation channel, the movable piece opens the ventilation channel under the action of the pressure difference of the two sides, the air pressure balance function of the ventilation valve deck is guaranteed, meanwhile, water vapor entering the channel in the air pressure balance state is reduced, and the ventilation effect is improved. And the sealing performance of the ventilation valve cover is improved.

Description

Technical Field

[0001] The utility model relates to the field of air-permeable valves, in particular to a air-permeable valve cover, an explosion-proof valve, a battery pack and a vehicle. Background Art

[0002] In the prior art, a battery pack is usually provided with a vent valve so that the air pressure inside and outside the battery pack can be balanced through the vent valve. When the internal air pressure is too high, the opening can be increased to release the pressure inside the battery pack. In order to ensure the air pressure balance function while reducing the possibility of external impurities entering the battery pack, a vent valve cover is usually provided inside the vent valve.

[0003] However, since air pressure balance is a two-way process, the existing valve cover can only open or seal the exhaust hole, allowing the airway to flow in one direction, which affects the performance of the battery pack. Therefore, a valve structure that can be opened and closed by elastic deformation and can ventilate in both directions is needed. At present, this type of valve structure is still vacant. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a breathable valve cover with improved sealing performance, an explosion-proof valve including the breathable valve cover, a battery pack including the explosion-proof valve, and a vehicle including the battery pack. Specifically, the present application includes the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a breathable valve cover, comprising:

[0006] A flexible cover, a support tube and a movable sheet, the inner edge of the flexible cover is connected to the support tube, the outer edge of the flexible cover can be elastically deformed along a first direction, the support tube has a breathable channel, a part of the movable sheet is connected to the inner wall of the support tube, and the other part is used to at least partially cover the breathable channel, and the movable sheet opens the breathable channel based on the pressure difference on both sides.

[0007] The air-permeable valve cover of the present application is provided with a flexible cover so that the outer edge of the flexible cover can be elastically deformed along a first direction when there is a pressure difference on both sides; the inner edge of the flexible cover is connected to the support tube, and the support tube has an air-permeable channel, and the support tube has a movable sheet, a part of the movable sheet is connected to the inner wall of the support tube, and the other part is used to at least partially cover the air-permeable channel, and the movable sheet opens the air-permeable channel based on the pressure difference on both sides, thereby ensuring the air pressure balancing function of the air-permeable valve cover of the present application while reducing the water vapor entering the channel in a natural state, thereby improving the sealing performance of the air-permeable valve cover of the present application.

[0008] In one embodiment, the flexible cover is disposed on the outer edge of the support tube and surrounds the support tube.

[0009] In one embodiment, along a direction perpendicular to the axis of the supporting cylinder, a cross section of the flexible cover is circular.

[0010] In one embodiment, along a direction perpendicular to the axis of the supporting cylinder, the cross section of the flexible cover is a quadrilateral.

[0011] In one embodiment, the thickness of the outer edge of the flexible cover is less than the thickness of the inner edge.

[0012] In one embodiment, a boss protruding toward the second direction is provided on the first side of the flexible cover.

[0013] In one embodiment, there are multiple movable sheets, and along the circumference of the support tube, a portion of each movable sheet is respectively connected to the inner wall of the support tube, and another portion of each movable sheet surrounds to at least partially shield the air permeable channel.

[0014] In one embodiment, the movable sheet extends inwardly from the inner wall of the support tube in a direction away from the flexible cover until it abuts against the inner wall of the support tube, so as to at least partially cover the air permeable channel.

[0015] In one embodiment, there are two movable pieces, and the two movable pieces abut against each other to form an angle, and the angle range is 90°-120°.

[0016] In one embodiment, the movable sheet is fan-shaped, and each fan-shaped sheet is surrounded around the same vertex to at least partially cover the ventilation channel.

[0017] In one embodiment, the number of the movable sheets is four, and the four movable sheets together form a cross-shaped gap to at least partially cover the through hole.

[0018] In one embodiment, a limiting boss for engaging with the outside is provided at the lower end of the outer side of the support tube.

[0019] In one embodiment, the thickness of the movable sheet is in the range of 0.2 to 0.5 mm.

[0020] In one embodiment, the air-permeable valve cover is made of silicone material in one piece.

[0021] In a second aspect, an embodiment of the present application provides an explosion-proof valve, including a breathable valve cover.

[0022] In a third aspect, an embodiment of the present application provides a battery pack, including a battery tray and an explosion-proof valve. The battery tray is provided with a vent hole, and the valve body of the vent valve is embedded in the vent hole.

[0023] In a fourth aspect, an embodiment of the present application provides a vehicle, including a vehicle body and a battery pack, wherein the battery pack is housed in the vehicle body.

[0024] It can be understood that since the vehicle provided in the fourth aspect of the present application, the battery pack provided in the third aspect, and the explosion-proof valve provided in the second aspect all adopt the breathable valve cover provided in the first aspect of the present application, it also has the beneficial effect of improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a cross-sectional view of a vent valve cover provided in one embodiment of the present application;

[0027] Figure 2 This is a side view of the appearance of a ventilated valve cover provided in one embodiment of the present application;

[0028] Figure 3 is a schematic diagram of the appearance of a ventilated valve cover provided in one embodiment of the present application;

[0029] Figure 4 is a schematic diagram of the appearance of a ventilated valve cover provided in one embodiment of the present application;

[0030] Figure 5 It is a structural schematic diagram of an explosion-proof valve provided in one embodiment of the present application;

[0031] Figure 6 is a schematic diagram of the appearance of a ventilating valve cover provided in another embodiment of the present application;

[0032] Figure 7 is a cross-sectional view of a vent valve cover provided in another embodiment of the present application;

[0033] Figure 8 This is a schematic diagram of the deformation of the movable sheet provided in one embodiment of the present application;

[0034] Fig. 9 is a bottom view of a deformed movable sheet provided in one embodiment of the present application;

[0035] Fig.10 is a schematic diagram of the appearance of a ventilating valve cover provided in another embodiment of the present application;

[0036] Fig.11 is a side view of the appearance of a ventilating valve cover provided in another embodiment of the present application;

[0037] Fig.12 is a cross-sectional view of a vent valve cover provided in yet another embodiment of the present application;

[0038] Reference numerals:

[0039] 00, breathable valve cover, 1, flexible cover, 11, boss, 2, support cylinder, 21, limit boss, 3, movable sheet, 4, breathable channel, 5, valve core, 6, valve core plane, 61, exhaust hole, 7, air inlet channel DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0041] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "including" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] The present application provides a vehicle, including a vehicle body and a battery pack. The battery pack is housed in the vehicle body to provide electrical energy to the vehicle. It is understandable that the battery pack can also be used in other places where electrical energy is required, and the present application does not specifically limit this.

[0045] The present application provides a battery pack, including a battery tray, a battery module, an explosion-proof valve and a vent cover. The battery module is accommodated in the battery tray, and a vent hole is provided on the battery tray. The vent hole penetrates the battery tray to achieve communication between the internal environment of the battery tray and the external environment. The valve body of the explosion-proof valve is embedded in the vent hole to reduce the possibility of external impurities entering the battery tray through the vent hole.

[0046] During the operation of the battery pack of the present application, the heat generated by the battery module will cause the pressure of the internal environment of the battery tray to increase. At the same time, when the battery module fails, it may also release high-pressure gas into the internal environment of the battery tray. When the internal environment pressure of the battery tray is greater than the external environment pressure, the internal air of the battery tray can be released to the external environment through the through hole in the explosion-proof valve, thereby balancing the pressure of the internal and external environments of the battery tray. The phenomenon of explosion of the battery pack of the present application caused by excessive internal pressure of the battery tray is avoided, thereby ensuring the safety of the battery pack of the present application.

[0047] On the other hand, when the temperature of the external environment of the battery tray is too high, or the temperature of the internal environment of the battery tray is too low, the pressure of the internal environment of the battery tray may be lower than the pressure of the external environment. The gas in the external environment can flow into the internal environment through the through hole in the explosion-proof valve, thereby balancing the pressure of the internal and external environments of the battery tray.

[0048] It can be understood that the explosion-proof valve is set to reduce the entry of external impurities into the battery tray through the vent hole. At the same time, when there is an air pressure difference between the internal and external environments of the battery tray, the gas from the internal environment or the external environment can be introduced into the external environment or the internal environment through the through hole in the explosion-proof valve, thereby achieving air pressure balance between the internal and external environments.

[0049] For ease of description, please refer to Figure 5 In this application, the vent valve cover 00 is embedded in the vent hole of the explosion-proof valve. It should be noted that in other embodiments, the vent valve cover 00 can also be applied to other valve bodies and scenarios that need to adjust the internal and external environmental air pressure. This application does not make any special restrictions on this.

[0050] See also Figure 1 The appearance diagram of the air-permeable valve cover 00 provided in one embodiment of the present application is shown in FIG. Figure 2 The cross-sectional view of the air-permeable valve cover 00 provided in one embodiment of the present application is shown. For ease of description, Figure 2 In the subsequent figures, the axial direction of the air permeable channel 4 is set as the first direction x1, and the second direction is set as the opposite direction x2.

[0051] like Figure 1-Figure 4 As shown, the vent valve 100 of the present application comprises a flexible cover 1, a support tube 2, a movable sheet 3 and a vent channel 4. The flexible cover 1 is provided with a protruding semicircular boss 11, and the lower end of the outer side of the support tube 2 is provided with a limiting boss 21 for clamping with the outside.

[0052] Please refer to Figure 5 When the breathable valve cover 00 of the present application is installed in the explosion-proof valve air inlet channel 7, the explosion-proof valve is installed in the battery pack, and when the air pressure of the internal environment of the battery pack is greater than the air pressure of the external environment, the high-pressure gas in the internal environment will act on the breathable valve cover 00. When the air pressure of the internal environment is relatively large, and the force exerted by the high-pressure gas on the flexible cover 1 is greater than the elastic force of the flexible cover 1 itself, the flexible cover 1 is deformed relative to the support tube 2 in a direction away from the core cover plane, and the internal high-pressure gas diffuses outward, thereby reducing the air pressure of the internal environment; when the force exerted by the high-pressure gas on the movable sheet 3 is greater than the elastic force of the movable sheet 3 itself, the movable sheet 3 can be deformed in a direction away from the flexible cover 1, and the air permeable channel 4 is opened, and the external high-pressure gas can enter the internal environment through the air permeable channel 4 to increase the air pressure of the internal environment.

[0053] It can be understood that the breathable valve cover 00 of the present application controls the opening and closing of the gas channel by the deformation of the two structures of the flexible cover 1 and the movable sheet 3 under the action of pressure, thereby achieving the balance of air pressure inside and outside the explosion-proof valve.

[0054] Specifically, an embodiment of the present application provides a breathable valve cover 00, comprising: a flexible cover 1, a support tube 2 and a movable sheet 3, the inner edge of the flexible cover 1 is connected to the support tube 2, the outer edge of the flexible cover 1 can be elastically deformed along a first direction, the support tube 2 has a breathable channel 4, a part of the movable sheet 3 is connected to the inner wall of the support tube 2, and the other part is used to at least partially cover the breathable channel 4, and the movable sheet 3 opens the breathable channel 4 based on the pressure difference on both sides.

[0055] The air-permeable valve cover 00 of the present application is provided with a flexible cover 1, so that the outer edge of the flexible cover 1 can be elastically deformed along a first direction when there is a pressure difference on both sides; the inner edge of the flexible cover 1 is connected to the support tube 2, and the support tube 2 has an air-permeable channel 4, and the support tube 2 has a movable sheet 3, a part of the movable sheet 3 is connected to the inner wall of the support tube 2, and the other part is used to at least partially cover the air-permeable channel 4, and the movable sheet 3 opens the air-permeable channel 4 based on the pressure difference on both sides, thereby ensuring the air pressure balancing function of the explosion-proof valve of the present application while reducing the water vapor entering the through hole in a natural state, thereby improving the sealing performance of the explosion-proof valve of the present application.

[0056] In one embodiment, the flexible cover 1 is disposed on the outer edge of the support tube 2 and surrounds the support tube 2. Specifically, the flexible cover 1 surrounds the upper end of the support tube 2 in an umbrella shape, and the flexible cover 1 can fit with the valve core plane 6 to cover the exhaust through hole 61 opened in the valve core plane 6 in a natural state.

[0057] It can be understood that when the air pressure of the internal environment is much greater than the air pressure of the external environment and the pressure reaches a predetermined value, the flexible cover 1 of the breathable valve cover 00 produces elastic deformation, and the outer edge of the flexible cover 1 deforms toward the first direction to open the corresponding exhaust hole 61, so that the high-pressure gas in the internal environment is output to the external environment through the exhaust hole 61, thereby achieving air pressure balance between the internal environment and the external environment.

[0058] It is understandable that as the gas release process proceeds, the air pressure of the internal environment gradually decreases, so that the increase in the deformation amount of the flexible cover 1 in the direction away from the core cover plane gradually decreases. When the force exerted by the internal high-pressure gas on the flexible cover 1 is less than the elastic force of the flexible cover 1 itself, the flexible cover 1 will deform relative to the support tube 2 in the direction close to the core cover plane under the action of its own elastic force until the flexible cover 1 covers the continuous air passage 4.

[0059] At this time, the flexible cover 1 is in a natural state, and the air pressure difference between the internal environment and the external environment of the explosion-proof valve is relatively small, or the air pressure is balanced, thereby achieving the air pressure balance function of the explosion-proof valve of the present application.

[0060] When the explosion-proof valve of the present application is in a natural state, the flexible cover 1 shields the exhaust hole 61 to prevent water vapor in the external environment from diffusing into the internal environment through the exhaust hole 61, further reducing the water vapor content in the internal environment and the possibility of water vapor liquefying in the internal environment. This further improves the sealing performance of the explosion-proof valve and improves the performance and safety of the battery pack.

[0061] In one embodiment, if Figure 1-Figure 4As shown, in the direction perpendicular to the axis of the support tube 2, the cross section of the flexible cover 1 is circular, that is, it surrounds the upper end of the support tube 2 in the shape of an umbrella surface, and the support tube 2 constitutes the handle part of the umbrella, and the entire air-permeable valve cover 00 is in the shape of an umbrella. The flexible cover 1 can fully cover the 360° area of ​​the upper end of the support tube 2 to shield the exhaust through hole 61. This embodiment can be adapted to a valve body with a large number of exhaust through holes 61 and the exhaust through holes 61 are irregularly arranged on the valve core plane 6.

[0062] In another embodiment, the cross-section of the flexible cover 1 along the direction perpendicular to the axis of the support tube 2 is a quadrilateral. The quadrilateral can be an irregular shape so as to be able to cover the exhaust hole 61. The present application does not limit the specific shape of the quadrilateral.

[0063] For details, please refer to Figure 6 and Figure 7 In one embodiment, the cross section of the flexible cover 1 is an irregular trapezoid with a pair of symmetrical sides being arcs and another pair of symmetrical sides being parallel straight lines, which can shield the exhaust through hole 61 opened in the valve core plane 6 that fits therewith.

[0064] In one embodiment, if Figure 1 and Figure 7 As shown, the thickness of the outer edge of the flexible cover 1 is less than the thickness of the inner edge. It can be understood that the thickness of the flexible cover 1 is positively correlated with the force required for its elastic deformation. The inner edge of the flexible cover 1 is connected to the support tube 2 and requires a certain strength to maintain the stability of the air-permeable valve cover 00 and the overall structure, so it is thicker. The part of the flexible cover 1 close to the outer edge shields the exhaust through hole 61 and controls the opening and closing of the exhaust through hole 61, so it is set to a smaller thickness. Specifically, when the air pressure of the internal environment of the battery pack is greater than the air pressure of the external environment, the high-pressure gas in the internal environment will act on the part of the air-permeable valve cover 00 close to the outer edge. When the air pressure of the internal environment is large and the force exerted by the high-pressure gas on the flexible cover 1 is greater than the elastic force of the flexible cover 1 itself, the flexible cover 1 is deformed relative to the support tube 2 in a direction away from the core cover plane, and the internal high-pressure gas diffuses outward.

[0065] Specifically, Figure 1 As shown, the thickness of the flexible cover 1 can decrease from the inner edge to the outer edge; in another embodiment, please refer to Figure 7 A slope is cut toward the outer edge of the bottom surface of the flexible cover 1 near the outer edge, so that the thickness of the outer edge is reduced.

[0066] In a specific embodiment, the outer edge thickness h1 of the flexible cover 1 is 0.5 mm, and the inner edge thickness h2 is 2 mm.

[0067] In one embodiment, a boss 11 protruding toward the second direction is provided on the first side of the flexible cover 1. The boss 11 causes a certain degree of elastic deformation of the middle section of the flexible cover 1 toward the second direction, thereby more closely fitting the valve core plane 6 and achieving a sealing effect.

[0068] Specifically, the boss 11 is a ring-shaped protrusion along the lower edge of the flexible cover 1, and its cross section can be semicircular, square, etc., and this application does not specifically limit this.

[0069] In some embodiments, there are multiple movable sheets 3, and along the circumference of the support tube 2, a portion of each movable sheet 3 is respectively connected to the inner wall of the support tube 2, and another portion of each movable sheet 3 is enclosed to cover the air permeable channel 4 in a natural state.

[0070] The natural state in the present application refers to two states: the air pressure on the two opposite sides of the air valve cover 00 is balanced, and the air pressure difference on the two opposite sides of the air valve cover 00 is relatively small.

[0071] Specifically, the movable sheet 3 can be understood as a closed elastic soft membrane arranged in the support tube 2. In order to achieve the ventilation function, an incision is made in the center of the closed soft membrane to divide it into a number of fan-shaped elastic sheets. The fan-shaped elastic sheets are closed in a natural state. When there is an air pressure difference between the internal and external environments, the pointed corners of the fan-shaped elastic sheets are deformed when the pressure difference on both sides reaches a specific value, thereby opening the ventilation channel 4.

[0072] Furthermore, when the vent cover 00 of the present application is installed on the explosion-proof valve, and the explosion-proof valve is installed on the battery pack, and when the air pressure of the internal environment of the battery pack is greater than the air pressure of the external environment, the high-pressure gas in the internal environment will enter the vent channel 4 and act on the multiple movable sheets 3, and cause each movable sheet 3 to deform in the direction close to the flexible cover 1, thereby expanding the incisions between each movable sheet 3 to open the vent channel 4. The specific deformation of the movable sheet 1 can be referred to Figure 8 and Fig. 9 .

[0073] At this time, the high-pressure gas in the internal environment can diffuse into the external environment through the opened air permeable channel 4, thereby reducing the air pressure difference between the internal environment and the external environment, and realizing the air pressure balance function of the air permeable valve cover 00 of the present application.

[0074] It can be understood that when the air pressure of the internal environment of the battery pack is lower than the air pressure of the external environment, similarly, each movable sheet 3 is deformed in a direction away from the flexible cover 1 to open the air permeable channel 4.

[0075] In another embodiment of the present application, the movable sheet 3 extends inward from the inner wall of the support tube 2 in a direction away from the flexible cover 1 until it abuts against the inner wall of the support tube 2 , so as to at least partially cover the air permeable channel 4 .

[0076] See also Figure 10-12 In one embodiment, the number of movable sheets 3 is two, and the two movable sheets 3 are against each other to form an angle, and the angle α ranges from 90° to 120°. The structure formed by the two movable sheets 3 against each other is shaped like a duckbill, which can be closed in a natural state, and open when the external environmental pressure of the explosion-proof valve is greater than the internal environmental pressure, and control the gas to flow in one direction toward the second direction.

[0077] In other embodiments, the number of movable sheets 3 can be other, and accordingly, the shape formed by the movable sheets 3 against each other also changes accordingly. When the number of movable sheets 3 is greater than two, the movable sheets 3 against each other can form a structure similar to the side of a pyramid. This application does not make any special limitation on this.

[0078] In one embodiment, each movable sheet 3 is fan-shaped, and each fan-shaped sheet is surrounded around the same vertex to at least partially shield the air permeable channel 4. Specifically, in the actual preparation process, an elastic structure that fixes and shields the air permeable channel 4 in the support tube 2 can be set on the inner wall of the support tube 2, and a cross cut is cut on the elastic structure to form each movable sheet 3. Each movable sheet 3 can be deformed under the action of external high-pressure gas, and the cuts between each movable sheet 3 are enlarged, thereby opening the air permeable channel 4. The deformation direction of each movable sheet 3 is not limited, so the movable sheet 3 in this embodiment can realize bidirectional flow of gas.

[0079] In one embodiment, if Figure 2 As shown, there are four movable sheets 3, and the four movable sheets 3 together form a cross cutout to at least partially cover the through hole.

[0080] In other embodiments, the number of movable sheets 3 can be other, and the shape of the cutouts can also change accordingly. This application does not make any special limitation on this.

[0081] Please refer to Figure 8 In one embodiment, the movable sheet 3 is arranged along the axial region of the inner wall of the support tube 2. Specifically, the movable sheet 3 can be arranged at any position in the upper end, the lower end and the area sandwiched between the inner wall of the support tube 2, that is, at any position in the air permeable channel 4. It can be understood that the movable sheet 3 can be arranged at any position in the axial region of the inner wall of the support tube 2, and can partially cover the air permeable channel 4 in a natural state, so as to at least partially cover the air permeable channel 4, and open the air permeable channel 4 when the air pressure difference on both sides of the movable sheet 3 reaches a certain value, so as to realize the air pressure balance function of the air permeable valve cover 00 of the present application.

[0082] In one embodiment, a limiting boss 21 for engaging with the outside is provided at the lower end of the outer side of the support tube 2. The limiting boss 21 is arranged around the outer periphery of the support tube and is engaged with the concave structure of the air inlet channel 7 of the explosion-proof valve, so that the air-permeable valve cover 00 can be installed and fixed in the explosion-proof valve to prevent it from axial displacement under the action of the air pressure difference on both sides, and plays a role of fixing and limiting.

[0083] In one embodiment, the thickness range h3 of the movable sheet 3 is 0.2-0.5 mm. It can be understood that within this thickness range, the pressure required for the movable sheet 3 to generate elastic deformation can meet the preset pressure value.

[0084] In this embodiment, the minimum pressure required to open the vent hole is specifically 0.3 kPA.

[0085] In one embodiment, the air valve cover 00 is made of a silicone material in one piece. It is understandable that the silicone material is elastic and can achieve elastic deformation to control the opening and closing of the gas channel. At the same time, the air valve cover 00 of the one-piece molding structure is firm in structure and simplifies the production process.

[0086] The embodiment of the present application provides an explosion-proof valve, including a breathable valve cover 00.

[0087] An embodiment of the present application provides a battery pack, including a battery tray and an explosion-proof valve. The battery tray is provided with a vent hole, and a valve body of the vent valve is embedded in the vent hole.

[0088] An embodiment of the present application provides a vehicle, including a vehicle body and a battery pack, wherein the battery pack is accommodated in the vehicle body.

[0089] It can be understood that since the vehicle, battery pack and explosion-proof valve provided in the present application all adopt the breathable valve cover 00 provided in the first aspect of the present application, it also has the beneficial effect of improving the sealing performance.

[0090] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in the field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in the field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this utility model still fall within the scope covered by this utility model.

Claims

1. A ventilated valve cover, characterized in that: The invention comprises a flexible cover (1), a support tube (2) and a movable sheet (3); the inner edge of the flexible cover (1) is connected to the support tube (2); the outer edge of the flexible cover (1) can be elastically deformed along a first direction; the support tube (2) has a ventilation channel (4); a part of the movable sheet (3) is connected to the inner wall of the support tube (2); the other part is used to at least partially cover the ventilation channel (4); the movable sheet (3) opens the ventilation channel (4) based on the pressure difference between the two sides.

2. The vent valve cover according to claim 1, characterized in that: The flexible cover (1) is arranged on the outer edge of the support tube (2) and surrounds the support tube (2).

3. The vent valve cover according to claim 2, characterized in that: Along a direction perpendicular to the axis of the support tube (2), the cross section of the flexible cover (1) is circular.

4. The vent valve cover according to claim 2, characterized in that: Along a direction perpendicular to the axis of the support tube (2), the cross section of the flexible cover (1) is a quadrilateral.

5. The vent valve cover according to claim 2, characterized in that: The thickness of the outer edge of the flexible cover (1) is smaller than the thickness of the inner edge.

6. The vent valve cover according to claim 2, characterized in that: The first side of the flexible cover (1) is provided with a boss (11) protruding in the second direction.

7. The vent valve cover according to claim 1, characterized in that: The movable sheets (3) are multiple in number, and along the circumference of the support tube (2), a portion of each movable sheet (3) is respectively connected to the inner wall of the support tube (2), and another portion of each movable sheet (3) is surrounded to at least partially cover the air permeable channel (4).

8. The vent valve cover according to claim 7, characterized in that: The movable sheet (3) extends inwardly from the inner wall of the support tube (2) in a direction away from the flexible cover (1) until it contacts the inner wall, so as to at least partially cover the air permeable channel (4).

9. The vent valve cover according to claim 8, characterized in that: The number of the movable pieces (3) is two, and the two movable pieces (3) abut against each other to form an angle, and the angle range of the angle is 90°-120°.

10. The ventilating valve cover according to claim 7, characterized in that: The movable sheet (3) is fan-shaped, and each fan-shaped sheet is surrounded by a same vertex to at least partially cover the ventilation channel (4).

11. The ventilating valve cover according to claim 10, characterized in that: The number of the movable sheets (3) is four, and the four movable sheets (3) are combined to form a cross-shaped gap to at least partially cover the ventilation channel (4).

12. The vent valve cover according to claim 1, characterized in that: The lower end of the outer side of the support tube (2) is provided with a limiting boss (21) for clamping with the outside.

13. The breathable valve cover according to claim 1, characterized in that: The thickness of the movable sheet (3) ranges from 0.2 to 0.5 mm.

14. The vent valve cover according to claim 1, characterized in that: The air-permeable valve cover (00) is made of a silicone material and is integrally formed.

15. An explosion-proof valve, characterized in that: It comprises the breathable valve cover (00) as described in any one of claims 1 to 14.

16. A battery pack, characterized in that: It comprises a battery tray and the explosion-proof valve as claimed in claim 15, wherein the battery tray is provided with a vent hole, and the valve body of the explosion-proof valve is embedded in the vent hole.

17. A vehicle, characterized in that: It comprises a vehicle body and a battery pack as claimed in claim 16, wherein the battery pack is accommodated in the vehicle body.

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