An explosion-proof valve, a battery pack and an electric device

Abstract

The utility model provides a kind of explosion-proof valve, battery pack and electrical equipment, it is related to explosion-proof valve technical field, the explosion-proof valve includes valve body, valve core and first sealing structure, the valve body includes main part and annular support structure, the annular support structure is coaxially fixed in the main part, the main part is used to be fixedly connected with the mounting surface of electrical equipment;The valve core is arranged in the main part;The first sealing structure is fixedly connected with the valve core, and the end face of the first sealing structure away from the valve core is sealed and attached with the annular support structure.The utility model can effectively avoid that rainwater, silt or even dust in external environment intrudes the inside of the mounting surface of electrical equipment through the gap between valve core and valve body, avoid that the insulation performance of electrical component in electrical equipment reduces, and then ensure that electrical equipment operates safely.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof valve technology, specifically to an explosion-proof valve, a battery pack, and electrical equipment. Background Technology

[0002] The safety performance of power battery packs in electrical equipment, such as energy storage systems, is receiving increasing attention. Under extreme conditions (such as thermal runaway), battery packs can generate large amounts of high-temperature, high-pressure gas, causing a rapid increase in internal pressure and posing a significant risk of pack rupture. Explosion-proof valves, as critical safety pressure relief devices on battery pack housings, can open quickly and reliably within a very short time after thermal runaway occurs, effectively releasing high-pressure gas and rapidly reducing internal pressure to prevent catastrophic explosion.

[0003] In existing technologies, common explosion-proof valve structures typically include a valve body, a valve core, and an inner sealing ring. The valve body is fixedly mounted on the battery pack casing, and an annular groove is machined on the end of the valve body facing outward from the casing. The inner sealing ring is manually embedded in this groove. The valve core is pressed against or covers the inner sealing ring, utilizing the elastic deformation of the inner sealing ring to achieve a seal between the valve body and the valve core, thereby isolating the internal and external environments of the battery pack during normal operation.

[0004] To facilitate the smooth embedding of the inner sealing ring into the groove, the annular width of the groove (i.e., the radial dimension of the groove) is usually slightly larger than the annular width of the inner sealing ring itself. Because the machining of the groove at the end of the valve body (requiring parameters such as depth and coaxiality) requires high precision, and the annular width of the groove is greater than that of the inner sealing ring, the inner sealing ring is prone to local tilting, twisting, or non-uniform deformation within the groove during manual assembly. This tilting or deformation increases the gap between the valve core and the valve body, allowing rainwater, mud, and even dust from the external environment to penetrate into the battery pack's casing. This reduces the insulation performance of the internal electrical components of the battery pack, thus affecting the safe operation of the electrical equipment. Utility Model Content

[0005] The problem solved by this invention is how to prevent rainwater, mud, sand, and even dust from the external environment from entering the inner side of the installation surface of electrical equipment through an explosion-proof valve, thereby ensuring the safe operation of the electrical equipment.

[0006] To solve the above problems, this utility model provides an explosion-proof valve, a battery pack, and electrical equipment.

[0007] In a first aspect, this utility model provides an explosion-proof valve, comprising:

[0008] The valve body includes a main body and an annular support structure. The annular support structure is coaxially fixed inside the main body. The main body is used to be fixedly connected to the mounting surface of the electrical equipment.

[0009] A valve core, wherein the valve core is disposed within the main body portion;

[0010] A first sealing structure is fixedly connected to the valve core, and the end face of the first sealing structure away from the valve core is sealed and fitted with the annular support structure.

[0011] Optionally, the valve core is snapped into the first sealing structure.

[0012] Optionally, the end face of the valve core facing the inner side of the mounting surface is fixedly connected to the first sealing structure by an adhesive material;

[0013] And / or, the end face of the valve core facing the inner side of the mounting surface is fixedly connected to the first sealing structure by a connecting structure.

[0014] Optionally, the annular support structure is an annular support plane;

[0015] Alternatively, the annular support structure includes an annular recess and an annular protrusion. The annular recess is disposed within the end of the main body, and the annular protrusion is disposed on the inner edge of the annular recess. The end face of the first sealing structure away from the valve core is sealed and fitted with the annular protrusion.

[0016] Optionally, the explosion-proof valve further includes a guide shaft and an elastic element. The valve core is provided with a connecting hole structure. The end of the guide shaft is fixedly connected to the connecting hole structure of the valve core. The elastic element is sleeved on the guide shaft. One end of the elastic element is connected to the end of the guide shaft away from the valve core, and the other end of the elastic element is connected to the valve body.

[0017] Optionally, the guide shaft includes a guide shaft body and a first threaded portion, the first threaded portion being disposed at one end of the guide shaft body, and the inner wall of the connecting hole structure being provided with a second threaded portion, the first threaded portion being threadedly connected to the second threaded portion.

[0018] Optionally, the explosion-proof valve further includes a gland and a breathable membrane, wherein the valve core is fixedly connected to the gland, the gland is located on the side of the valve core away from the guide shaft, and the breathable membrane is fixed at the connection between the gland and the valve core;

[0019] The guide shaft is provided with a first exhaust channel that extends through it along its axial direction. The first exhaust channel is opposite to and spaced apart from the breathable membrane. The pressure cap is provided with an exhaust hole, and the breathable membrane is connected to the exhaust hole.

[0020] Optionally, the breathable membrane is made of synthetic fabric or metal material.

[0021] Optionally, the end face of the valve core facing the gland includes a first step portion and a second step portion. The first step portion is disposed around the second step portion. The breathable membrane is fixed between the first step portion and the gland. The second step portion protrudes relative to the first step portion toward the guide shaft, so that a first exhaust area communicating with the first exhaust channel is formed between the second step portion and the breathable membrane.

[0022] Optionally, the explosion-proof valve further includes a magnetic sheet, and the gland is provided with a first mounting groove, the magnetic sheet being fixed in the first mounting groove of the gland; the magnetic sheet is used to magnetically connect with the magnet of the test fixture.

[0023] Optionally, the end of the guide shaft body near the first threaded portion has a stepped structure, and the outer diameter of the stepped structure is larger than the outer diameter of the first threaded portion.

[0024] Secondly, this utility model provides a battery pack, including the explosion-proof valve as described above.

[0025] Thirdly, this utility model provides an electrical device, including the explosion-proof valve as described above, or including the battery pack as described above.

[0026] The beneficial effects of this utility model of explosion-proof valve, battery pack, and electrical equipment are:

[0027] The explosion-proof valve mainly includes a valve body, a valve core, and a first sealing structure. The main body of the valve body is fixedly connected to the mounting surface of the electrical equipment to achieve the fixed installation of the explosion-proof valve on the mounting surface of the electrical equipment.

[0028] Since the valve core is fixedly connected to the first sealing structure, the first sealing structure is fixedly installed on the valve core. In other words, the first sealing structure is directly fixed to the valve core and not to the valve body. Therefore, there is no need to process grooves at the end of the valve body, and correspondingly, there is no need to manually press the first sealing structure into the groove of the valve body. Thus, the first sealing structure will not experience problems such as local tilting, twisting, or non-uniform deformation. Furthermore, the end face of the first sealing structure away from the valve core can seal and fit with the annular support structure of the valve body. By fixing the first sealing structure to the valve core, the gap between the valve core and the valve body is reduced, ensuring the sealing effect between the valve core and the valve body. This effectively prevents rainwater, mud, and even dust from the external environment from entering the inner side of the mounting surface of the electrical equipment through the gap between the valve core and the valve body, preventing the insulation performance of the electrical components inside the electrical equipment from being reduced, and thus ensuring the safe operation of the electrical equipment. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the explosion-proof valve in an embodiment of this utility model;

[0030] Figure 2 for Figure 1 One of the schematic diagrams of the cross-sectional structure along the central section line GG;

[0031] Figure 3 This is a schematic diagram of the valve core and the first sealing structure in one embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the valve core and the first sealing structure in another embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the valve core and the first sealing structure in another embodiment of the present invention;

[0034] Figure 6 This is one of the schematic diagrams of a partial explosion structure of the explosion-proof valve in the embodiments of this utility model;

[0035] Figure 7 for Figure 1 Schematic diagram of the cross-sectional structure along section line GG (Part 2);

[0036] Figure 8 This is a schematic diagram of the valve body in an embodiment of the present invention;

[0037] Figure 9 This is the second schematic diagram of the partial explosion structure of the explosion-proof valve in this embodiment of the present invention;

[0038] Figure 10 This is one of the structural schematic diagrams of the pressure cap in the embodiments of this utility model;

[0039] Figure 11 This is the second schematic diagram of the structure of the pressure cap in the embodiment of this utility model;

[0040] Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure along the central section line HH;

[0041] Figure 13 This is a schematic diagram of the valve core structure in an embodiment of this utility model;

[0042] Figure 14 This is a cross-sectional structural diagram of the valve core, guide shaft, and first sealing structure in an embodiment of the present utility model;

[0043] Figure 15 for Figure 1 The third schematic diagram of the cross-sectional structure along the central section line GG.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1-Valve body; 11-Main body; 111-Second exhaust channel; 12-Annular support structure; 121-Annular recess; 122-Annular protrusion; 13-Third threaded part; 14-Sleeve part; 15-Connecting rod; 2-Valve core; 21-First annular groove; 22-Connecting hole structure; 23-Second threaded part; 24-First step part; 25-Second step part; 3-First sealing structure; 4-Guide shaft; 41-Guide shaft body; 411-First exhaust channel; 412-Step structure; 42-First threaded part; 43-Annular groove structure; 5-Elastic element; 6-Gland; 61-Exhaust hole; 62-First mounting groove; 63-Second mounting groove; 7-Ventilating membrane; 8-Magnetic sheet; 9-Second sealing structure; 10-Gel material; 16-Connecting structure. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0047] In the attached diagram, the X-axis represents the front-back position, with the positive direction of the X-axis representing the right side and the negative direction representing the left side; the Z-axis represents the up-down position, with the positive direction of the Z-axis representing the top and the negative direction representing the bottom. It should be noted that the aforementioned representations of the X and Z axes are merely for ease of description and simplification of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0048] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0049] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0050] In related technologies, common explosion-proof valve structures typically include a valve body, a valve core, and an inner sealing ring. The valve body is fixedly mounted on the casing of, for example, a battery pack of electrical equipment, and its end (usually facing the outside of the casing) is machined with an annular groove. The inner sealing ring (usually made of an elastic material such as rubber or silicone) is manually pressed into the groove of the valve body. The elastic deformation of the inner sealing ring achieves a seal between the valve core and the valve body, thereby isolating the internal and external environments of the casing when the battery pack is operating normally.

[0051] However, this traditional explosion-proof valve structure has significant technical defects in actual manufacturing and assembly, which seriously affect its sealing reliability and ultimate safety performance:

[0052] To ensure the inner seal ring can be smoothly embedded into the groove, the annular width of the groove (i.e., the radial dimension of the groove) is typically designed to be slightly larger than the annular width (radial thickness) of the inner seal ring itself. This design clearance is necessary for manufacturing and assembly tolerances.

[0053] During the assembly process of manually pressing the inner sealing ring into the groove, the inner sealing ring is prone to local tilting, twisting, or non-uniform deformation because the groove ring width is larger than the inner sealing ring width, and manual operation is difficult to control precisely. This abnormal state prevents the inner sealing ring from maintaining an ideal, uniformly compressed flat state within the groove. The tilting or deformation of the inner sealing ring directly leads to uneven contact pressure between it and the groove sidewalls of the valve core and valve body, and may even form unexpected micro-gaps or leakage channels in some areas. This significantly reduces the static sealing performance of the explosion-proof valve under normal operating conditions (non-pressure relief state), allowing rainwater, mud, and even dust from the external environment to penetrate into the battery pack housing through the gap between the valve core and valve body. The internal environment of the battery pack has extremely high insulation requirements, and the intrusion of moisture and mud will significantly reduce the insulation resistance of electrical components, leading to serious faults such as insulation failure, short circuits, and increased leakage current, thereby affecting the safe operation of electrical equipment.

[0054] To address the problems existing in the aforementioned related technologies, this utility model provides an explosion-proof valve, a battery pack, and electrical equipment.

[0055] like Figure 1 and Figure 2 As shown in the figure, an explosion-proof valve provided in this embodiment of the present invention includes:

[0056] Valve body 1, the valve body 1 includes a main body 11 and an annular support structure 12, the annular support structure 12 is coaxially disposed in the main body 11, the main body 11 is used to be fixedly connected to the mounting surface of the electrical equipment;

[0057] Valve core 2, the valve core 2 being disposed within the main body 11;

[0058] The first sealing structure 3 is fixedly connected to the valve core 2, and the end face of the first sealing structure 3 away from the valve core 2 is sealed and fitted with the annular support structure 12.

[0059] Specifically, the main body 11 of the valve body 1 can serve as the connection point between the entire explosion-proof valve and the mounting surface of the electrical equipment. The annular support structure 12 can be an annular protrusion structure, an annular rib structure, etc.

[0060] The annular support structure 12 and the main body 11 can be constructed as an integral structure to ensure the strength of the valve body 1. The annular support structure 12 and the main body 11 are coaxially arranged, and the first sealing structure 3 fixed on the valve core 2 is sealed and fitted with the annular support structure 12, which can effectively ensure the sealing effect between the valve core 2 and the valve body 1.

[0061] The valve core 2 is coaxially arranged with the main body 11 and is movably connected to the main body 11 so that when the explosion-proof valve is opened, the valve core 2 can move relative to the valve body 1 toward the outside of the mounting surface to quickly discharge the gas of the electrical equipment and realize the depressurization operation of the electrical equipment.

[0062] The valve body 1 and valve core 2 can be made of metal such as aluminum alloy. The surface of the valve body 1 is anodized, which has the advantages of high temperature resistance, non-combustibility, and high impact resistance.

[0063] The first sealing structure 3 can be made of soft materials such as rubber or silicone. The outer side of the mounting surface can be... Figure 2 In the coordinate system, the positive Z-axis is aligned with the inner side of the mounting surface, which can be aligned with... Figure 2 In the coordinate system, the Z-axis is in the same direction in opposite directions.

[0064] The end face of the first sealing structure 3 away from the valve core 2 is sealed and fitted with the annular support structure 12. This can be understood as the end face of the first sealing structure 3 away from the valve core 2 (or the inner side of the first sealing structure 3) and the annular support structure 12 being in contact or abutting (with mutual squeezing force) relationship, and there is no gap between them, which can achieve a tight fit and ensure the sealing effect.

[0065] In this embodiment, the explosion-proof valve mainly includes a valve body 1, a valve core 2, and a first sealing structure 3. The main body 11 of the valve body 1 is fixedly connected to the mounting surface of the electrical equipment to realize the fixed installation of the explosion-proof valve on the mounting surface of the electrical equipment.

[0066] Since the valve core 2 is fixedly connected to the first sealing structure 3, the first sealing structure 3 is fixedly installed on the valve core 2. In other words, the first sealing structure 3 is directly fixedly installed on the valve core 2 and not fixed to the valve body 1. Therefore, it is not necessary to process grooves at the end of the valve body 1, and correspondingly, it is not necessary to manually press the first sealing structure 3 into the groove of the valve body 1. Thus, the first sealing structure 3 will not produce problems such as local tilting, twisting or non-uniform deformation. Moreover, the end face of the first sealing structure 3 away from the valve core 2 can be sealed and fitted with the annular support structure 12 of the valve body 1. By fixing the first sealing structure 3 on the valve core 2, the gap between the valve core 2 and the valve body 1 is reduced, ensuring the sealing effect between the valve core 2 and the valve body 1. This effectively prevents rainwater, mud, and even dust in the external environment from entering the inner side of the mounting surface of the electrical equipment through the gap between the valve core 2 and the valve body 1, avoiding the reduction of the insulation performance of the electrical components inside the electrical equipment, and thus ensuring the safe operation of the electrical equipment.

[0067] Optionally, the valve core 2 is engaged with the first sealing structure 3.

[0068] Specifically, the first sealing structure 3 can be an annular sealing ring.

[0069] The valve core 2 can be engaged with the first sealing structure 3 in a variety of ways;

[0070] In the first type, the circumferential sidewall of the valve core 2 is connected to the first sealing structure 3 by an internal snap-fit ​​method, combined with Figure 3 As shown, the circumferential sidewall of the valve core 2 is provided with a first annular groove 21, and the first sealing structure 3 is embedded and snapped into the first annular groove 21 to achieve the snapping and fixing of the first sealing structure 3 onto the valve core 2.

[0071] The second method involves connecting the inner end face of the valve core 2 to the first sealing structure 3 via an external snap-fit ​​connection. For example, a first annular groove 21 can be provided on the inner end face of the valve core 2, and the first sealing structure 3 is embedded and snapped into the first annular groove 21 to secure the first sealing structure 3 to the valve core 2. The valve core 2 is located along... Figure 2 In the coordinate system, the positive direction of the Z-axis is the outer side of valve core 2, and valve core 2 is along... Figure 2 In the coordinate system, the opposite direction of the Z-axis is the inside of valve core 2.

[0072] Of course, the snap-fit ​​method between valve core 2 and first sealing structure 3 includes, but is not limited to, the two methods mentioned above. Any snap-fit ​​method that can achieve quick assembly of the two is applicable to this technical solution, and no specific limitation is made here.

[0073] In this optional embodiment, since the valve core 2 is snapped into the first sealing structure 3, the ease of disassembling and assembling the valve core 2 and the first sealing structure 3 can be improved.

[0074] Optionally, combined Figure 4 and Figure 5 As shown, the end face of the valve core 2 facing the inner side of the mounting surface is fixedly connected to the first sealing structure 3 by an adhesive material 10.

[0075] And / or, the end face of the valve core 2 facing the inner side of the mounting surface is fixedly connected to the first sealing structure 3 by a connecting structure 16.

[0076] Specifically, the adhesive material 10 includes, but is not limited to, glue, adhesive backing structure, and encapsulation structure formed by encapsulation process. Among them, the encapsulation process can be molding encapsulation process, injection molding encapsulation process, dip encapsulation process, spraying encapsulation process, etc. This encapsulation process can be understood as covering the surface of the valve core 2 with a fluid material (rubber, silicone), and after the fluid material cures, it can form a combination structure of the first sealing structure 3 and the adhesive material 10.

[0077] The end face of the valve core 2 facing the inner side of the mounting surface refers to the inner end face of the valve core 2; combined with Figure 4 As shown, an adhesive material 10, which can be provided as a backing structure or glue between the inner end face of the first sealing structure 3 and the valve core 2, can improve the connection stability between the first sealing structure 3 and the valve core 2.

[0078] The inner end face of the valve core 2 can be fixedly connected to the first sealing structure 3 using various connection structures 16, for example, combined with... Figure 5 As shown, the connection structure 16 may include a first connector and a second connector. Multiple first connectors are spaced apart on the inner end face of the valve core 2, and multiple second connectors are spaced apart on the outer end face of the first sealing structure 3. Each first connector is inserted into a second connector. This increases the number and area of ​​connection points between the first sealing structure 3 and the valve core 2, thereby improving the connection stability. The first and second connectors are adapted to each other; for example, the first and second connectors may resemble a male-female plug structure.

[0079] For example, the connecting structure 16 may include a first threaded structure and a second threaded structure. The valve core may be a multi-segment cylindrical structure with different diameters. The first threaded structure may be provided on the outer circumferential wall of the smaller diameter cylinder of the valve core 2, and the second threaded structure may be provided at the inner hole of the first sealing structure 3, so that the first threaded structure and the second threaded structure can be adapted to each other for connection (threaded connection). That is, the first sealing structure 3 is rotated and sleeved on part of the valve core 2, which can also realize the quick fixation of the first sealing structure 3 on the valve core 2. Wherein, if the first threaded structure is an internal thread, the second threaded structure is an external thread; when the first threaded structure is an external thread, the second threaded structure is an internal thread.

[0080] The annular support structure 12 can adopt at least two of the following structural methods, therefore, Figure 2 The middle ring support structure 12 and Figure 7 and Figure 15 The structure of the ring support structure 12 in the middle is different.

[0081] Alternatively, the first method, combining Figure 2 As shown, the annular support structure 12 is an annular support plane.

[0082] Specifically, the annular support structure 12 is an annular support plane. In other words, the annular support structure 12 adopts a relatively flat annular support surface. When the end face of the first sealing structure 3 away from the valve core 2 is sealed and fitted with the annular support plane, the sealing effect of the first sealing structure 3 and the annular support structure 12 can be improved by increasing the contact area between the first sealing structure 3 and the annular support structure 12.

[0083] Alternatively, unlike the above embodiments, the second method combines... Figure 7 and Figure 15 As shown, the annular support structure 12 includes an annular recess 121 and an annular protrusion 122. The annular recess 121 is disposed inside the end of the main body 11, and the annular protrusion 122 is disposed on the inner edge of the annular recess 121. The end face of the first sealing structure 3 away from the valve core 2 is sealed and fitted with the annular protrusion 122.

[0084] Specifically, the annular protrusion 122 may protrude outward relative to the annular recess 121 toward the outside of the mounting surface.

[0085] The outer diameter of the first sealing structure 3 may be greater than the outer diameter of the annular protrusion 122 and less than the outer diameter of the annular recess 121, and the outer diameter of the annular protrusion 122 may be greater than the inner diameter of the first sealing structure 3.

[0086] The first sealing structure 3 can be a flat gasket structure made of flexible material; in other words, the first sealing structure 3 along... Figure 2 The shape of the plane after sectioning the central axis of the explosion-proof valve is rectangular. Of course, the first sealing structure 3 is along... Figure 2 The shape of the plane after the central axis of the explosion-proof valve is cut is still a polygon.

[0087] In this optional embodiment, the first sealing structure 3 is an annular sealing ring, and the annular protrusion 122 is an annular protrusion structure fixed to the annular recess 121 inside the main body 11. Since the outer diameter of the first sealing structure 3 is larger than the outer diameter of the annular protrusion 122, when the first sealing structure 3 and the annular protrusion 122 are sealed together, the annular width of the first sealing structure 3 is larger than the annular width of the annular protrusion 122, so that the outer end face of the annular protrusion 122 can completely contact the first sealing structure 3, thereby increasing the connection area between the two and ensuring the sealing effect between the first sealing structure 3 and the annular support structure 12. The outer end face of the annular protrusion 122 refers to the area along which the annular protrusion 122 extends. Figure 2 The end face in the positive Z-axis direction of the coordinate system.

[0088] Optionally, combined Figure 6 As shown, the explosion-proof valve also includes a guide shaft 4 and an elastic element 5. The valve core 2 is provided with a connection hole structure 22. The end of the guide shaft 4 is fixedly connected to the connection hole structure 22 of the valve core 2. The elastic element 5 is sleeved on the guide shaft 4. One end of the elastic element 5 is connected to the end of the guide shaft 4 away from the valve core 2, and the other end of the elastic element 5 is connected to the valve body 1.

[0089] Specifically, a connecting hole structure 22 can be opened at the center of the valve core 2, and the connecting hole structure 22 is coaxial with the valve core 2.

[0090] One end of the guide shaft 4 can be inserted into the connecting hole structure 22 of the valve core 2, so as to realize the fixed connection between the guide shaft 4 and the valve core 2.

[0091] The elastic element 5 can be sleeved on the outside of the guide shaft 4. The elastic element 5 can be a flexible structure with axial expansion and contraction deformation. Therefore, the elastic element 5 can be a compression spring or a flexible tube.

[0092] Since one end of the elastic element 5 is connected to the end of the guide shaft 4 away from the valve core 2, and the other end of the elastic element 5 is connected to the valve body 1, when the explosion-proof valve is opened, the guide shaft 4 and the valve core 2 move synchronously relative to the valve body 1 towards the outside of the mounting surface to discharge the air pressure inside the electrical equipment, causing the elastic element 5 to be compressed and shortened; when the air pressure inside the electrical equipment is less than the external air pressure, the elastic element 5 returns to its original length due to the elastic restoring force, so that the guide shaft 4 and the valve core 2 move synchronously relative to the valve body 1 towards the inside of the mounting surface, causing the explosion-proof valve to close.

[0093] Optionally, the guide shaft 4 can be fixedly connected to the connecting hole of the valve core 2 in the following manner, for example, by combining... Figure 6As shown, the guide shaft 4 includes a guide shaft body 41 and a first threaded portion 42. The first threaded portion 42 is disposed at one end of the guide shaft body 41, and the inner wall of the connecting hole structure 22 is provided with a second threaded portion 23. The first threaded portion 42 and the second threaded portion 23 are threadedly connected.

[0094] Specifically, the guide shaft body 41 and the first threaded portion 42 can be an integral structure.

[0095] If the first threaded portion 42 is an external thread, then the second threaded portion 23 is an internal thread (see...). Figure 6 (as shown); or, if the first threaded portion 42 is an internal thread, then the second threaded portion 23 is an external thread.

[0096] In this optional embodiment, the first threaded portion 42 provided at the end of the guide shaft 4 can be inserted into the second threaded portion 23 in the connecting hole structure 22 of the valve core 2 by rotation, which can realize the quick assembly and disassembly of the guide shaft 4 and the connecting hole structure 22 of the valve core 2.

[0097] Optionally, combined Figure 2 , Figure 7 and Figure 8 As shown, the valve body 1 also includes a sleeve portion 14 and a plurality of connecting rods 15. The sleeve portion 14 is coaxially arranged with the main body portion 11. The plurality of connecting rods 15 are fixed to the outside of the sleeve portion 14 at an annular interval, and the sleeve portion 14 is connected to the inner wall of the main body portion 11 through the connecting rods 15. The end of the guide shaft 4 passes through the sleeve portion 14 and is engaged with the connecting hole structure 22.

[0098] The other end of the elastic element 5 abuts against the sleeve portion 14.

[0099] Specifically, in combination Figure 7 As shown, the inner diameter of the sleeve portion 14 can be greater than or equal to that of the guide shaft 4, so that the end of the guide shaft 4 can be smoothly inserted into the sleeve portion 14 and engaged with the connecting hole structure 22 of the valve core 2. The sleeve portion 14 can be used to guide the linear movement of the guide shaft 4 and the valve core 2 within the valve body 1.

[0100] Combination Figure 7 and Figure 8 As shown, multiple connecting rods 15 are arranged in a ring at intervals between the outer wall of the sleeve portion 14 and the inner wall of the main body portion 11, which can serve as a connection between the sleeve portion 14 and the main body portion 11; the sleeve portion 14 can be fixedly connected to the inside of the main body portion 11 through the connecting rods 15.

[0101] Both ends of the elastic element 5 can be connected to the end of the guide shaft 4 away from the valve core 2 and the valve body 1 in the following manner: for example, the first threaded portion 42 of the guide shaft 4 passes through the sleeve portion 14 and is engaged with the connecting hole structure 22 of the valve core 2, and the end of the guide shaft 4 away from the valve core 2 can be in a free state; Figure 9 As shown, the guide shaft 4 also includes an annular groove structure 43, which is disposed at the end of the guide shaft body 41 away from the valve core 2; one end of the elastic member 5 is embedded in and engaged in the annular groove structure 43 of the guide shaft 4, and the other end of the elastic member 5 abuts against the sleeve portion 14 of the valve body 1.

[0102] When the explosion-proof valve is in normal working condition, the guide shaft 4 and valve core 2 do not move axially, and the elastic element 5 does not undergo compression deformation. When the explosion-proof valve is in the open state, the valve core 2 drives the guide shaft 4 to move axially relative to the valve body 1 towards the outside of the mounting surface to release pressure. At this time, the elastic element 5 between the annular groove structure 43 of the guide shaft 4 and the sleeve portion 14 of the valve core 2 is compressed and deformed. After the pressure is released, the elastic element 5 returns to its original position and elongates under its own elastic restoring force. The valve core 2 drives the guide shaft 4 to move axially relative to the valve body 1 towards the inside of the mounting surface to complete the closing action of the explosion-proof valve.

[0103] The valve body 1 can be fixedly connected to the mounting surface in the following ways: for example, a third threaded part 13 is provided on the outer circumferential side of the main body 11 of the valve body 1, and a mounting hole is opened on the mounting surface. The third threaded part 13 of the valve body 1 is threadedly connected to the mounting hole of the mounting surface, so that the valve body 1 can be fixedly installed in the mounting hole.

[0104] The valve body 1 can be provided with a second annular groove on the outer wall of the main body 11. The explosion-proof valve also includes a second sealing structure 9, which is embedded in the second annular groove. When the valve body 1 is installed in the mounting hole of the mounting surface, the second sealing structure 9 can seal the valve body 1 of the explosion-proof valve with the mounting surface.

[0105] Optionally, combined Figure 7 and Figure 10 As shown, the explosion-proof valve also includes a pressure cap 6 and a breathable membrane 7. The valve core 2 is fixedly connected to the pressure cap 6, and the pressure cap 6 is located on the side of the valve core 2 away from the guide shaft 4. The breathable membrane 7 is fixed at the connection between the pressure cap 6 and the valve core 2.

[0106] The guide shaft 4 is provided with a first exhaust channel 411 that extends through it along its axial direction. The first exhaust channel 411 is opposite to and spaced apart from the breathable membrane 7. The pressure cover 6 is provided with an exhaust hole 61, and the breathable membrane 7 is connected to the exhaust hole 61.

[0107] Specifically, the gland 6 can be fixedly connected to the valve core 2 in the following ways: for example, the gland 6 and the valve core 2 can be fixedly connected by an interference fit and / or by riveting. Further, combined with... Figure 11 and Figure 12 As shown, a second mounting groove 63 can be opened on the inner end face of the pressure cap 6, and the valve core 2 is embedded and snapped into the second mounting groove 63.

[0108] The breathable membrane 7 can be fixed to the connection between the gland 6 and the valve core 2 in the following ways: for example, the breathable membrane 7 can be fixed between the valve core 2 and the gland 6 by means of bonding, riveting, etc.

[0109] The breathable membrane 7 can be fixedly connected to the pressure cap 6, or to the valve core 2, or simultaneously to both the pressure cap 6 and the valve core 2.

[0110] The guide shaft 4 is provided with a first exhaust channel 411 that runs through and extends along its axial direction. One end of the first exhaust channel 411 is connected to the inner side of the mounting surface of the electrical equipment, and the other end of the first exhaust channel 411 is connected to the exhaust hole 61 of the pressure cover 6 through the breathable membrane 7.

[0111] The circumferential sidewall of the pressure cap 6 is provided with a plurality of vent holes 61 arranged in a ring at intervals.

[0112] Combination Figure 7 As shown, a second exhaust channel 111 is formed between the outer wall of the guide shaft 4 and the main body 11, and a second exhaust region is formed between the circumferential outer wall of the annular support structure 12 and the pressure cap 6 and the inner wall of the main body 11. The second exhaust channel 111 is connected to the second exhaust region.

[0113] In this optional embodiment, during normal operation of the battery pack of the electrical equipment, the explosion-proof valve can be in a normal working state. Gas inside the valve body 1 (or inside the battery pack housing) or external gas flows freely through the breathable membrane 7. Gas flows from the side with higher pressure to the side with lower pressure. That is, when the internal pressure of the valve body 1 is greater than the external pressure, the gas inside the battery pack housing is discharged sequentially through the first exhaust channel 411 of the guide shaft 4, the breathable membrane 7, and the exhaust port 61 (this process is also called positive pressure exhaust state), thereby reducing the internal air pressure of the electrical equipment's mounting surface and achieving pressure balance between the inside and outside of the electrical equipment. Conversely, when the internal pressure of the valve body 1 is less than the external pressure, external gas from the explosion-proof valve enters the electrical equipment sequentially through the exhaust port 61 of the pressure cap 6, the breathable membrane 7, and the first exhaust channel 411 of the guide shaft 4 (this process is also called negative pressure intake state), to achieve pressure balance between the inside and outside of the valve body 1.

[0114] When the battery pack of an electrical device malfunctions, the internal air pressure of the battery pack increases, making the internal gas pressure greater than the external pressure. When the pressure difference between the inside and outside of the battery pack exceeds the set opening pressure of the explosion-proof valve core, the explosion-proof valve is in the explosion-proof open state. At this time, the gas inside the battery pack flows sequentially through the first exhaust channel 411 of the guide shaft 4 to the ventilated membrane 7. Due to the high air pressure and flow rate inside the valve body 1, some of the gas exerts a pushing force (or thrust) on the ventilated membrane 7, causing the ventilated membrane 7 to drive the valve core 2 and the guide shaft 4 to move linearly towards the outside of the valve body 1 relative to the valve core 2. This increases the gap between the valve core 2 (or pressure cap 6) and the circumferential inner wall of the main body 11. At this point, the gas inside the electrical equipment has two exhaust paths: one is the first exhaust channel 411 of the guide shaft 4, the vent membrane 7, and the exhaust hole 61; the other is the second exhaust channel 111 formed between the guide shaft 4 and the main body 11, the second exhaust area, and the gap between the pressure cap 6 and the end of the main body 11 (i.e., the second exhaust channel is directly connected to the outside). This allows for rapid gas discharge from the battery pack, quickly reducing the internal pressure and preventing the battery pack casing from bursting. After the battery pack is depressurized, the elastic restoring force of the elastic element 5 pulls the valve core 2 and the guide shaft 4 in a linear direction toward the inner side of the mounting surface, achieving automatic reset and sealing of the explosion-proof valve.

[0115] Optionally, the breathable membrane 7 is made of synthetic fabric or metal material.

[0116] Specifically, synthetic fabrics refer to fabrics made from chemically synthesized fibers, such as polyester, nylon, and polypropylene. Therefore, synthetic fabrics have a multi-mesh structure.

[0117] Preferably, the breathable membrane 7 made of synthetic fabric can be a polytetrafluoroethylene (e-PTFE) microporous membrane material. The pore size of this membrane material is between 0.1-10μm, which is more than 1,000 times larger than the diameter of a gas, and one-thousandth the size of a water droplet. It is larger than air molecules and water vapor (the average diameter of an air molecule is only 0.00036μm, and the average diameter of water vapor is 0.00047μm). Therefore, while preventing liquid water, gas can pass through smoothly, achieving good waterproof and breathable performance.

[0118] Preferably, the breathable membrane 7 can be made of a metal material with a certain strength, such as stainless steel, so the breathable membrane 7 can be a stainless steel laser-drilled membrane.

[0119] Optionally, combined Figure 13As shown, the end face of the valve core 2 facing the pressure cap 6 includes a first step portion 24 and a second step portion 25. The first step portion 24 is arranged around the second step portion 25. The breathable membrane 7 is fixed between the first step portion 24 and the pressure cap 6. The second step portion 25 protrudes relative to the first step portion 24 toward the guide shaft 4, so that a first exhaust area communicating with the first exhaust channel 411 is formed between the second step portion 25 and the breathable membrane 7.

[0120] Specifically, the end face of the valve core 2 facing the pressure cap 6 can be the outer end face of the valve core 2. The outer end face of the valve core 2 can include a first step portion 24 and a second step portion 25. The first step portion 24 and the second step portion 25 can both be annular step surfaces, wherein the first step portion 24 surrounds the second step portion 25 and the two are coaxially arranged.

[0121] A gap is reserved between the first step 24 and the pressure cap 6 so that a breathable membrane 7 can be installed in the gap.

[0122] The first step portion 24 protrudes towards the pressure cover 6 relative to the first step portion 24, thereby reducing the gap between the first step portion 24 and the pressure cover 6 and helping to fix the breathable membrane 7 between the two.

[0123] The second step portion 25 protrudes towards the guide shaft 4 relative to the first step portion 24 to increase the volume of the area between the second step portion 25 and the breathable membrane 7, thereby improving the pressure relief effect of the battery pack. The area between the second step portion 25 and the breathable membrane 7 can be defined as the first exhaust area. The first exhaust channel 411 of the guide shaft 4 is connected to the exhaust hole 61 through the first exhaust area, the breathable membrane 7, and the exhaust hole 61.

[0124] Optionally, combined Figure 7 , Figure 11 and Figure 12 As shown, the explosion-proof valve also includes a magnetic sheet 8. The pressure cover 6 is provided with a first mounting groove 62, and the magnetic sheet 8 is fixed in the first mounting groove 62 of the pressure cover 6. The magnetic sheet 8 is used to magnetically connect with the magnet of the test fixture.

[0125] Specifically, the pressure cap 6 is provided with a first mounting groove 62, and the magnetic sheet 8 can be embedded and snapped into the first mounting groove 62 of the pressure cap 6.

[0126] Magnetic sheet 8 can be an iron sheet.

[0127] The first mounting groove 62 is closer to the outside of the cover 6 than the second mounting groove 63. In other words, the first mounting groove 62 and the second mounting groove 63 are spaced apart along the axial direction of the cover 6 to ensure that the magnetic sheet 8 installed in the first mounting groove 62 and the valve core 2 installed in the second mounting groove 63 will not interfere with each other.

[0128] In this optional embodiment, after the explosion-proof valve is manufactured, it can be loaded onto a test fixture to perform an airtightness test. For example, the test fixture is an airtightness test fixture with a locking position. The locking position of the test fixture is pushed in along the first annular groove 21 of the valve core 2 in the explosion-proof valve until it is locked. Since the locking position of the airtightness test fixture has a magnet, it can be attracted and connected with the magnetic sheet 8 in the pressure cap 6, which can enhance the stability of the locking connection between the explosion-proof valve and the airtightness test fixture and prevent movement during the airtightness test.

[0129] Among them, the airtightness testing fixture is used to test the airtightness of the explosion-proof valve, which is existing technology and will not be described in detail here.

[0130] Optionally, combined Figure 14 As shown, the guide shaft body 41 has a stepped structure 412 at the end near the first threaded portion 42, and the outer diameter of the stepped structure 412 is larger than the outer diameter of the first threaded portion 42.

[0131] Specifically, the part of the guide shaft body 41 near the first threaded part 42 has a stepped structure 412. In other words, the outer diameter of the stepped structure 412 is larger than the outer diameter of the first threaded part 42. When the first threaded part 42 of the guide shaft 4 is rotatably connected to the second threaded part 23 of the connecting hole structure 22 of the valve core 2, the stepped structure 412 not only serves as a stop (or limit) for the threaded connection between the guide shaft 4 and the valve core 2, but also, in the working state and explosion-proof opening state of the explosion-proof valve, the end of the second threaded part 23 of the valve core 2 contacts or fits with the stepped structure 412 of the guide shaft 4, which can play a balancing role for the valve core 2 and prevent the valve core 2 from swinging left and right relative to the guide shaft 4, causing the first sealing structure 3 between the valve core 2 and the annular support structure 12 of the valve body 1 to fail.

[0132] This utility model provides a battery pack including the explosion-proof valve as described above.

[0133] The battery pack in this embodiment also includes a housing, which may have a mounting surface for electrical equipment. The valve body 1 of the explosion-proof valve can be fixedly installed in the mounting hole of the mounting surface in the housing. A battery module can be installed inside the housing, and the battery module includes multiple battery cells connected in series and parallel.

[0134] The battery pack in this embodiment has the same beneficial effects over the prior art as the explosion-proof valve described above, and will not be repeated here.

[0135] This utility model provides an electrical device, which includes the explosion-proof valve as described in the above embodiment, or the battery pack as described in the above embodiment.

[0136] Specifically, the electrical equipment can be applied to multiple fields, such as energy storage cabinets and energy storage containers used in the energy storage field. The mounting surface of the electrical equipment can be the battery pack enclosure in the energy storage cabinet or the side panel of the energy storage container.

[0137] The electrical equipment can also be an outdoor electrical cabinet or a communication base station cabinet, in which case the mounting surface of the electrical equipment can be the side panel of the outdoor electrical cabinet or the communication base station cabinet.

[0138] Electrical equipment can also be new energy vehicles, hybrid vehicles, electric motorcycles, etc., which have battery packs. In this case, the mounting surface of the electrical equipment can be a side wall of the battery pack housing in the car or motorcycle.

[0139] Electrical equipment can also be photovoltaic equipment, security equipment, lighting fixtures, etc. In this case, the mounting surface of the electrical equipment can be the side panel of the photovoltaic equipment (such as photovoltaic grid-connected cabinets and photovoltaic distribution cabinets), the mounting surface of the electrical equipment can be the side panel of the security equipment (security monitoring cabinets), and the mounting surface of the electrical equipment can be the housing of the lighting fixtures (explosion-proof lighting fixtures, safety explosion-proof lighting fixtures, and mobile explosion-proof lighting fixtures, etc.).

[0140] When the explosion-proof valve is installed on the mounting surface of the aforementioned electrical equipment, it can balance the internal and external pressure difference of the mounting surface of the electrical equipment and provide rapid explosion-proof pressure relief.

[0141] The beneficial effects of the electrical equipment in this embodiment compared to the prior art are the same as those of the explosion-proof valve or battery pack described above, and will not be repeated here.

[0142] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body (1) includes a main body (11) and an annular support structure (12). The annular support structure (12) is coaxially disposed within the main body (11). The main body (11) is used to be fixedly connected to the mounting surface of the electrical equipment. Valve core (2), the valve core (2) is disposed inside the main body (11); The first sealing structure (3) is fixedly connected to the valve core (2), and the end face of the first sealing structure (3) away from the valve core (2) is sealed and fitted with the annular support structure (12).

2. The explosion-proof valve according to claim 1, characterized in that, The valve core (2) is engaged with the first sealing structure (3).

3. The explosion-proof valve according to claim 1, characterized in that, The valve core (2) is fixedly connected to the first sealing structure (3) by an adhesive material (10) at the end face facing the inner side of the mounting surface. And / or, the end face of the valve core (2) facing the inner side of the mounting surface is fixedly connected to the first sealing structure (3) by a connecting structure (16).

4. The explosion-proof valve according to claim 1, characterized in that, The annular support structure (12) is an annular support plane; Alternatively, the annular support structure (12) includes an annular recess (121) and an annular protrusion (122). The annular recess (121) is disposed inside the end of the main body (11), and the annular protrusion (122) is disposed on the inner edge of the annular recess (121). The end face of the first sealing structure (3) away from the valve core (2) is sealed and fitted with the annular protrusion (122).

5. The explosion-proof valve according to claim 1, characterized in that, It also includes a guide shaft (4) and an elastic element (5). The valve core (2) is provided with a connection hole structure (22). The end of the guide shaft (4) is fixedly connected to the connection hole structure (22) of the valve core (2). The elastic element (5) is sleeved on the guide shaft (4). One end of the elastic element (5) is connected to the end of the guide shaft (4) away from the valve core (2), and the other end of the elastic element (5) is connected to the valve body (1).

6. The explosion-proof valve according to claim 5, characterized in that, The guide shaft (4) includes a guide shaft body (41) and a first threaded portion (42). The first threaded portion (42) is disposed at one end of the guide shaft body (41). The inner wall of the connecting hole structure (22) is provided with a second threaded portion (23). The first threaded portion (42) and the second threaded portion (23) are threadedly connected.

7. The explosion-proof valve according to claim 5, characterized in that, It also includes a pressure cap (6) and a breathable membrane (7), the valve core (2) is fixedly connected to the pressure cap (6), the pressure cap (6) is located on the side of the valve core (2) away from the guide shaft (4), and the breathable membrane (7) is fixed at the connection between the pressure cap (6) and the valve core (2); The guide shaft (4) is provided with a first exhaust channel (411) that runs through it along its axial direction. The first exhaust channel (411) is opposite to and spaced apart from the breathable membrane (7). The pressure cap (6) is provided with an exhaust hole (61). The breathable membrane (7) is connected to the exhaust hole (61).

8. The explosion-proof valve according to claim 7, characterized in that, The breathable membrane (7) is made of synthetic fabric or metal material.

9. The explosion-proof valve according to claim 7, characterized in that, The end face of the valve core (2) facing the pressure cap (6) includes a first step portion (24) and a second step portion (25). The first step portion (24) is arranged around the second step portion (25). The breathable membrane (7) is fixed between the first step portion (24) and the pressure cap (6). The second step portion (25) protrudes relative to the first step portion (24) toward the guide shaft (4) so ​​that a first exhaust area communicating with the first exhaust channel (411) is formed between the second step portion (25) and the breathable membrane (7).

10. The explosion-proof valve according to claim 7, characterized in that, It also includes a magnetic sheet (8), the pressure cover (6) is provided with a first mounting groove (62), and the magnetic sheet (8) is fixed in the first mounting groove (62) of the pressure cover (6); the magnetic sheet (8) is used to magnetically connect with the magnet of the test fixture.

11. The explosion-proof valve according to claim 6, characterized in that, The guide shaft body (41) has a stepped structure (412) at the end near the first threaded portion (42), and the outer diameter of the stepped structure (412) is larger than the outer diameter of the first threaded portion (42).

12. A battery pack, characterized in that, Includes the explosion-proof valve as described in any one of claims 1 to 11.

13. An electrical appliance, characterized in that, It includes the explosion-proof valve as described in any one of claims 1 to 11, or the battery pack as described in claim 12.

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