One-way pressure release valve

Abstract

The one-way pressure release valve comprises a valve body and a valve cover, a pressure release hole penetrating through the valve body is formed in the valve body, and the valve body is sequentially divided into a threaded section, a torsion section and a sealing section in the gas circulation direction in the pressure release hole; the sealing section is sleeved with a sealing ring; the valve cover covers the sealing ring and is fixedly connected with the end face, deviating from the threaded section, of the torsion section, and a plurality of exhaust holes communicating with the pressure relief hole are evenly distributed in the peripheral side of the bottom of the valve cover at intervals. A sealing piece is connected into the valve deck through a reset spring, and the sealing piece abuts against the sealing ring under the elastic effect of the reset spring to form sealing fit. Compared with the prior art, the one-way pressure release valve has the technical effects that the structure is simpler, the manufacturing process requirement is lower, the cost is lower, and the use is safer and more reliable, and is very suitable for being applied to new energy automobiles and energy storage equipment sensitive to cost on a large scale.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief valves, in particular to a one-way pressure relief valve. Background Art

[0002] In the prior art, in new energy electric vehicles and energy storage equipment, the battery or battery pack may react abnormally during long-term operation, resulting in an increase in the internal air pressure of the battery or battery pack, forming an excessively high internal pressure. The guided pressure relief valve in the prior art has the following problems when applied to new energy electric vehicles and energy storage equipment: First, the existing pressure relief valve has a sophisticated and complex structure, contains many small parts, and has extremely high processing technology requirements, which leads to high production costs of the existing pressure relief valve, and is not suitable for large-scale application in cost-sensitive new energy electric vehicles and energy storage equipment. Secondly, the existing pressure relief valves are mostly made of metal materials such as stainless steel. These metal materials are prone to corrosion in the strong acid and strong alkaline electrolyte environment of new energy batteries, thereby shortening the service life of the pressure relief valve, and once the pressure relief function fails, it will directly threaten the safety of the battery and battery pack. Furthermore, the existing metal pressure relief valve is large in size and weight, which is not conducive to the miniaturization and lightweight design requirements of the battery pack. The large-volume pressure relief valve also limits the effective energy storage space in the battery pack. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a one-way pressure relief valve which improves the corrosion resistance and the use safety under strong acid and strong alkali conditions and reduces the complexity of the structure and the manufacturing process.

[0004] In order to achieve the above-mentioned purpose, the one-way pressure relief valve designed by the utility model includes a valve body and a valve cover, the valve body and the valve cover are made of flame-retardant plastic material, the valve body is provided with a pressure relief hole penetrating the valve body, and the valve body is divided into a threaded section, a torsion section and a sealing section in sequence along the gas flow direction in the pressure relief hole; the sealing section is an annular structure protruding from the end face of the torsion section away from the threaded section, and a sealing ring is sleeved on the sealing section; the valve cover covers the sealing ring and is fixedly connected to the end face of the torsion section away from the threaded section, and a plurality of exhaust holes connected to the pressure relief hole are evenly spaced around the bottom side of the valve cover; a sealing sheet is connected to the inside of the valve cover through a reset spring, and the sealing sheet contacts the sealing ring under the elastic action of the reset spring to form a sealing fit.

[0005] In order to enhance the tightness of the fit, the end face of the torsion section away from the threaded section protrudes to form an annular boss, which is concentrically arranged with the sealing section, and a sealing groove is formed between the annular boss and the sealing section, and the sealing ring is assembled in the sealing groove.

[0006] For better sealing performance, the radial cross-section of the sealing ring is elliptical.

[0007] In order to avoid deviation, a guide rod is fixedly connected to the side of the sealing sheet facing away from the sealing ring, and a guide groove that slidably cooperates with the guide rod is arranged inside the valve cover.

[0008] In order to prevent the sealing sheet from twisting when in motion, the radial cross section of the guide rod is cross-shaped.

[0009] In order to simplify the manufacturing process, the valve cover and the torsion section are fixedly connected by ultrasonic welding.

[0010] In order to increase the connection stability, the end surface of the torsion section away from the threaded section is concave to form a positioning groove, the bottom of the valve cover is placed in the positioning groove and is fixedly connected to the torsion section by ultrasonic welding.

[0011] In order to improve the convenience of installation and the sealing effect, the torsion section is in the shape of a hexagonal nut, and an installation groove is opened on the end surface of the torsion section facing the threaded section, and a sealing gasket is arranged in the installation groove.

[0012] In order to improve product reliability, the flame retardant grade of the valve cover and valve body is UL94 V0.

[0013] The one-way pressure relief valve designed by the utility model adopts flame-retardant plastic material, modular design to simplify the structure, air-tight cooperation between the sealing ring and the sealing plate, setting a reset spring to realize automatic reset, exhaust hole to discharge overpressure gas, boss and sealing groove to enhance air tightness, setting a guide mechanism to avoid deviation and using ultrasonic welding connection and other technical means. Compared with the prior art, the one-way pressure relief valve has a simpler structure, lower production process requirements, lower cost, and safer and more reliable use. It is very suitable for large-scale application in cost-sensitive new energy vehicles and energy storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a front perspective view of Example 1;

[0015] Figure 2 is a stereogram from another viewing angle of Example 1;

[0016] Figure 3 yes Figure 1 3D exploded view of

[0017] Figure 4 It is a schematic diagram of the half-section plan structure of Example 1.

[0018] Among them: valve body 1, threaded section 11, torsion section 12, sealing section 13, valve cover 2, exhaust hole 21, guide groove 22, pressure relief hole 3, sealing ring 4, return spring 5, sealing sheet 6, guide rod 61, annular boss 7, sealing groove 71, positioning groove 8, sealing gasket 9. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Example 1.

[0021] like Figure 1-4 As shown, the one-way pressure relief valve described in this embodiment includes a valve body 1 and a valve cover 2, the valve body 1 and the valve cover 2 are made of flame-retardant plastic material, a pressure relief hole 3 penetrating the valve body 1 is provided inside the valve body 1, and the valve body 1 is divided into a threaded section 11, a torsion section 12 and a sealing section 13 in sequence along the gas flow direction in the pressure relief hole 3; the sealing section 13 is an annular structure in which the torsion section 12 protrudes from the end face of the threaded section 11, and a sealing ring 4 is sleeved on the sealing section 13; the valve cover 2 covers the sealing ring 4 and is fixedly connected to the end face of the torsion section 12 away from the threaded section 11, and a plurality of exhaust holes 21 connected to the pressure relief hole 3 are evenly spaced around the bottom side of the valve cover 2; a sealing sheet 6 is connected to the valve cover 2 through a reset spring 5, and the sealing sheet 6 contacts the sealing ring 4 under the elastic action of the reset spring 5 to form a sealing fit. In this embodiment, the valve body 1 and the valve cover 2 are made of flame-retardant plastic material by injection molding, and the flame retardancy level reaches UL94 V0, which means that the material will not spontaneously combust and will not produce open flames after the fire source is evacuated. Such a design greatly improves the fire safety of the valve body and the valve cover, which is especially important for applications in high-risk environments such as new energy electric vehicles and energy storage equipment.

[0022] In specific implementation, the valve body 1 is installed to the required position through the threaded section 11, and the pressure relief hole 3 inside it is connected to the inside of the energy storage device such as the battery pack. In the initial state, the sealing sheet 6 inside the valve cover 2 contacts the sealing ring 4 under the elastic action of the reset spring 5 to form a sealed fit. When the pressure inside the energy storage device such as the battery pack increases abnormally, the pressure will overcome the reset spring 5 and push the sealing sheet 6 to move, thereby driving the valve cover 2 to lift, and the gas is released from the pressure relief hole 3 through the exhaust hole 21 to achieve the pressure relief function. After the pressure is released, the reset spring 5 resets and re-forms the seal to achieve one-way pressure relief. In general, this structural design is compact in size, light in weight, and has a small number of components. It not only takes into account the requirements of fire prevention, sealing, and rapid pressure relief, but is also easy to mass produce and install. It has outstanding comprehensive performance and is very suitable for use in places such as battery packs with limited space. In addition, with this structural design, there is no need to set auxiliary components such as positioning claws between the sealing piece 6 and the valve body 1 (torsion section 12), which avoids the wear of auxiliary components such as positioning claws that affect the opening and closing accuracy. At the same time, the service life of opening and closing is also improved. Moreover, after the positioning auxiliary components (positioning claws) are eliminated between the sealing piece 6 and the valve body 1 (torsion section 12), the overall flatness of the sealing piece 6 and the valve body 1 itself is improved, and the sealing effect is better after the sealing piece 6 is reset.

[0023] In some embodiments, Figure 3 and Figure 4 As shown, the end surface of the torsion section 12 away from the threaded section 11 is protruded to form an annular boss 7, the annular boss 7 is concentrically arranged with the sealing section 13, and a sealing groove 71 is formed between the annular boss 7 and the sealing section 13, and the sealing ring 4 is assembled in the sealing groove 71. In this way, the sealing ring 4 is assembled in the sealing groove 71, which can play a good positioning and limiting role on the sealing ring 4, so as to enhance the tightness of the fitting between the sealing ring 4 and the valve body 1 (torsion section 12), prevent the possibility of the sealing ring 4 loosening or falling off, and improve the reliability of the seal.

[0024] In the embodiment, the radial cross section of the sealing ring 4 is elliptical. The aspect ratio of the elliptical cross section makes it easier for the sealing ring 4 to produce elastic deformation when pressed by the sealing sheet 6, that is, the extrusion deformation of the sealing ring 4 after compression sealing is effectively released in the sealing groove 71, thereby improving the sealing effect.

[0025] In some embodiments, Figure 3 and Figure 4 As shown, the side of the sealing sheet 6 facing away from the sealing ring 4 is fixedly connected with a guide rod 61, and the valve cover 2 is provided with a guide groove 22 that slides with the guide rod 61. In this embodiment, the sliding cooperation of the guide rod 61 and the guide groove 22 together constitutes a stable guide system, which helps to ensure that the sealing sheet 6 can accurately and stably cooperate with the sealing ring 4 when the pressure changes, avoids the problem of uncontrolled deviation of the sealing sheet 6, and thus improves the performance of the pressure relief valve. In this embodiment, as shown in FIG. Figure 3 As shown, the radial cross-section of the guide rod 61 is cross-shaped to prevent the sealing sheet 6 from twisting when it moves axially along the guide rod 61. It can be understood that in another possible implementation method, the cross-section of the guide rod 61 can be selected according to specific needs. Different shapes other than circular, such as triangular, square, etc., can limit the rotation of the guide rod 61.

[0026] In some embodiments, in order to simplify the manufacturing process, the valve cover 2 and the torsion section 12 are fixedly connected by ultrasonic welding. Traditional mechanical connection may require additional parts such as bolts and nuts, while the use of ultrasonic welding to fix the valve cover 2 and the torsion section 12 can reduce the number of parts, and ultrasonic welding can complete welding in a short time while ensuring the connection strength, avoiding the need for additional welding materials or supplementary processes in traditional welding, reducing the steps and materials required for assembly, and reducing manufacturing costs.

[0027] In some embodiments, Figure 3 and Figure 4As shown, in order to increase the connection stability, the end surface of the torsion section 12 facing away from the threaded section 11 is concavely formed with a positioning groove 8, and the bottom of the valve cover 2 is placed in the positioning groove 8 and is fixedly connected to the torsion section 12 by ultrasonic welding. The presence of the positioning groove 8 effectively prevents the misalignment or offset between the torsion section 12 and the valve cover 2, and can effectively avoid the problem of loose connection due to relative displacement.

[0028] In some embodiments, Figure 2 As shown, in order to improve the convenience of installation and the sealing effect, the torsion section 12 is in the shape of a hexagonal nut, and a mounting groove is provided on the end surface of the torsion section 12 facing the threaded section 11, and a sealing gasket 9 is provided in the mounting groove. In this embodiment, the design of the torsion section 12 in the shape of a hexagonal nut makes installation and tightening more convenient, that is, the hexagonal shape provides better grip, which helps to use a hexagonal wrench or other tools for tightening, making the installation operation easier and faster, and the sealing gasket 9 in the mounting groove can fill the gap of the connecting part of the torsion section 12 to prevent leakage of liquid or gas and ensure the sealing of the connection point.

[0029] The one-way pressure relief valve provided in this embodiment adopts flame-retardant plastic material, modular design to simplify the structure, air-tight cooperation between the sealing ring and the sealing plate, setting a reset spring to achieve automatic reset, exhaust holes to discharge overpressure gas, bosses and sealing grooves to enhance air tightness, setting a guide mechanism to avoid deviation, and using ultrasonic welding connection and other technical means. Compared with the prior art, the one-way pressure relief valve achieves a technical effect of simpler structure, lower manufacturing process requirements, lower cost, and safer and more reliable use. The valve is very suitable for large-scale application in cost-sensitive new energy vehicles and energy storage equipment.

[0030] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A one-way pressure relief valve, comprising a valve body (1) and a valve cover (2), characterized in that: The valve body (1) and the valve cover (2) are made of flame-retardant plastic material; a pressure relief hole (3) penetrating the valve body (1) is provided inside the valve body (1); and the valve body (1) is divided into a threaded section (11), a torsion section (12) and a sealing section (13) in sequence along the gas flow direction in the pressure relief hole (3); the sealing section (13) is an annular structure protruding from the end face of the torsion section (12) away from the threaded section (11), and a sealing ring (4) is sleeved on the sealing section (13); the valve cover (2) covers the sealing ring (4) and is fixedly connected to the end face of the torsion section (12) away from the threaded section (11), and a plurality of sealing rings (4) are evenly spaced around the bottom circumference of the valve cover (2). The valve cover (2) is provided with a sealing sheet (6) connected to the pressure relief hole (3); the sealing sheet (6) is connected to the valve cover (2) via a return spring (5); the sealing sheet (6) contacts the sealing ring (4) under the elastic action of the return spring (5) to form a sealing fit; the end surface of the torsion section (12) facing away from the threaded section (11) protrudes to form an annular boss (7); the annular boss (7) and the sealing section (13) are arranged concentrically, and a sealing groove (71) is formed between the annular boss (7) and the sealing section (13); the sealing ring (4) is assembled in the sealing groove (71); no positioning auxiliary component is provided between the sealing sheet (6) and the valve body (1).

2. The one-way pressure relief valve according to claim 1, characterized in that: The radial cross section of the sealing ring (4) is elliptical.

3. The one-way pressure relief valve according to claim 1, characterized in that: A guide rod (61) is fixedly connected to the side of the sealing sheet (6) facing away from the sealing ring (4), and a guide groove (22) that slidably cooperates with the guide rod (61) is provided inside the valve cover (2).

4. The one-way pressure relief valve according to claim 3, characterized in that: The radial cross section of the guide rod (61) is cross-shaped.

5. The one-way pressure relief valve according to claim 1, characterized in that: The valve cover (2) and the torsion section (12) are fixedly connected by ultrasonic welding.

6. The one-way pressure relief valve according to claim 1 or 5, characterized in that: The end surface of the torsion section (12) facing away from the threaded section (11) is concavely formed with a positioning groove (8), and the bottom of the valve cover (2) is placed in the positioning groove (8) and is fixedly connected to the torsion section (12) by ultrasonic welding.

7. The one-way pressure relief valve according to claim 1, characterized in that: The torsion section (12) is in the shape of a hexagonal nut, and a mounting groove is provided on the end surface of the torsion section (12) facing the threaded section (11), wherein a sealing gasket (9) is provided in the mounting groove.

8. The one-way pressure relief valve according to claim 1 or 2 or 4 or 5 or 7, characterized in that: The flame retardant grade of the valve cover (2) and the valve body (1) is UL94 V0.

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