Novel explosion-proof valve structure capable of releasing pressure continuously
By employing a pressure relief kit and sealing components in the explosion-proof valve structure, and utilizing the cooperation of the top holding spring and sealing gasket, continuous and instantaneous pressure relief of the internal air pressure of the battery is achieved, overcoming the shortcomings of existing explosion-proof valve structures, extending battery life, and simplifying the disassembly and assembly process.
Patent Information
- Application Number
- CN202422946193.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-30
AI Technical Summary
Existing explosion-proof valve structures rely too heavily on the quality of the explosion-proof disc and the preset pressure value, making it impossible to provide continuous pressure relief. Moreover, they can only provide pressure relief once, leading to pressure buildup inside the battery, which can cause bulging or bursting, and making disassembly and assembly difficult.
The system employs a pressure relief kit and sealing components, including a stepped sleeve, an outer cover, a sealing gasket, and a top holding spring. Through the cooperation of the sealing gasket and the top holding spring, the internal air pressure of the battery can be continuously relieved. The elastic force of the top holding spring controls the opening and closing of the air inlet. Combined with a waterproof and breathable membrane and a pressure-relieving space, the system enables the continuous discharge of gas.
It achieves continuous pressure relief inside the battery, avoiding battery bulging and bursting, extending battery life, reducing costs, and can quickly relieve pressure under instantaneous high pressure. The structure is simple and easy to disassemble and assemble.
Smart Images
Figure CN223514177U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery cover plate technical field, concretely relates to a novel sustainable pressure relief explosion -proof valve structure. BACKGROUND
[0002] In order to ensure safety, the battery cover plate is usually provided with an explosion-proof valve structure. After long-term use, the power battery inevitably accumulates a large amount of gas inside the battery, and the temperature will rise sharply and the high pressure will open the explosion-proof valve structure to release pressure, so as to prevent the internal high-pressure gas from being released directly to cause the battery to burst.
[0003] However, the existing explosion-proof valve structure mainly uses an explosion-proof sheet to control the internal pressure of the battery, that is, when the internal pressure of the battery reaches the preset pressure value of the explosion-proof sheet, the explosion-proof sheet will directly burst and separate to open the blast hole on the battery cover plate, so that the pressure is released at one time. But this explosion-proof valve structure has the following disadvantages:
[0004] First, the internal pressure threshold of the battery usually needs to reach the preset pressure of the explosion-proof sheet to open the blast hole of the battery cover plate. But in actual use, in order to reduce the cost and prevent the explosion-proof sheet from bursting too easily, the preset pressure of the explosion-proof sheet is relatively large, and the continuous accumulation of internal pressure of the battery cannot quickly reach the preset value for discharge, and the generated pressure is easy to cause the battery to appear bulging phenomenon. And if the explosion-proof sheet is damaged, the explosion-proof sheet is invalid, the internal pressure will not only cause the battery to bulge, but also the battery will directly burst after a long time. Therefore, this explosion-proof valve structure is too dependent on the explosion-proof sheet, and the explosion-proof sheet is mainly fixed by ultrasonic welding, and the heat generated will directly affect the size of the preset value of the explosion-proof sheet. Therefore, the preset pressure value and quality of the explosion-proof sheet will directly affect the safety of the battery, and the structural performance is not stable enough.
[0005] Secondly, this kind of explosion-proof valve can only be used for one-time structure in the limit case, that is, as long as the internal pressure of the battery accumulates to the preset pressure value of the explosion-proof sheet, the explosion-proof sheet will burst and separate and cannot be used again. Such structure has a great influence on the service life of the battery.
[0006] Thirdly, the explosion-proof valve structure is extremely troublesome to disassemble and assemble, and the disassembly and assembly are difficult. For example, when the electrolyte inside the battery is not enough, the secondary liquid injection operation is difficult to realize.
[0007] In summary, the existing explosion-proof valve structure still needs to be further improved to meet the actual use requirements. UTILITY MODEL CONTENTS
[0008] This utility model provides a novel explosion-proof valve structure for sustainable pressure relief. Its structure is simple, easy to implement, and low in cost. It primarily addresses the problem that existing explosion-proof valve structures rely too heavily on the quality of the explosion-proof disc and preset pressure values, and can only provide one-time pressure relief, failing to achieve sustainable pressure relief. The main technical solutions employed are as follows:
[0009] A novel explosion-proof valve structure with sustainable pressure relief is installed on a cover plate body welded to a battery box to seal a rupture hole on the cover plate body. The structure is characterized by: a pressure relief kit and a sealing assembly; wherein the pressure relief kit includes a stepped sleeve inserted and fixed to the rupture hole, and an outer cover covering an exposed opening at one end of the stepped sleeve, the stepped sleeve being partially exposed and in contact with the outside; the stepped sleeve has an internal venting chamber for housing the sealing assembly; the venting chamber communicates with the inside of the battery box through an air inlet at the other end of the stepped sleeve. The air inlet is connected to the outside through the vent hole on the side wall of the stepped sleeve; the sealing assembly includes a sealing gasket and a holding spring disposed in the air passage cavity; the holding spring is axially disposed on the outer cover through a limiting structure, and its axis is parallel to the axis of the stepped sleeve; the holding spring axially presses against the end face of the sealing gasket, causing the sealing gasket to move axially and form a seal with the inner wall surface of the stepped sleeve to close the air inlet; the air pressure inside the battery box acts on the sealing gasket, causing the holding spring to be axially compressed or reset, thereby linking the sealing gasket to open and close the air inlet.
[0010] Preferably, a limiting ring is formed on the inner peripheral wall of the stepped sleeve, and the limiting ring is located at the air inlet position; a waterproof and breathable membrane is welded on the limiting ring, and a pressure-relieving space is formed between the waterproof and breathable membrane and the air passage cavity, so that the air pressure inside the battery box can enter the air passage cavity in sequence through the waterproof and breathable membrane and the pressure-relieving space.
[0011] Preferably, the limiting structure is a limiting hole located at the center of the inner end face of the outer cover; the top holding spring is axially inserted into the limiting hole, such that the outer peripheral wall of the top holding spring part is in contact with the wall of the limiting hole, thereby constraining the displacement of the top holding spring in the radial direction, so as to limit the axis of the top holding spring to be parallel to the axis of the stepped sleeve.
[0012] Preferably, the diameter of the limiting hole is less than or equal to the diameter of the top holding spring.
[0013] Preferably, the sealing gasket is configured as a soft sealing gasket, and the top holding spring is configured as a V-shaped top holding spring; the top of the top holding spring is inserted into the limiting hole, and its bottom acts on the end face of the sealing gasket; when the air pressure inside the battery box acts on the sealing gasket, the sealing gasket is softly deformed against the bottom of the top holding spring and can be tilted to open the air inlet.
[0014] Preferably, the sealing gasket further includes an integrally formed disc portion and an annular portion; the outer periphery of the disc portion is inclined and chamfered, and the inner wall surface of the stepped sleeve is formed with an inclined platform; the top holding spring can pass through the inner cavity of the annular portion along the axial direction and hold the end face of the disc portion, driving the outer periphery of the disc portion to be tightly attached to the wall surface of the inclined platform to form an inclined surface fit seal.
[0015] Preferably, when the top holding spring is axially compressed, the outer wall surface of the annular portion can be aligned and tightly attached to the vent hole of the stepped sleeve side wall to seal the vent hole; when the top holding spring is axially reset, the outer wall surface of the annular portion can be misaligned with the vent hole of the stepped sleeve side wall to open the vent hole.
[0016] Preferably, the cover plate body has an installation groove, and a sealing ring is provided in the installation groove; the thickness of the sealing ring is higher than the groove depth of the installation groove; when the stepped sleeve is inserted into the rupture hole, the stepped sleeve acts on the sealing ring and presses the thickness of the sealing ring to be equal to the groove depth of the installation groove.
[0017] Preferably, the stepped sleeve is detachably screwed into the blast hole.
[0018] Preferably, the stepped sleeve sidewall has a plurality of vent holes, and each of the vent holes is arranged at equal intervals around the outer peripheral wall of the stepped sleeve.
[0019] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:
[0020] (1) This utility model provides a novel explosion-proof valve structure for sustainable pressure relief. Its structure is simple, easy to implement, and low in cost. It mainly solves the problem that existing explosion-proof valve structures rely too heavily on the quality of the explosion-proof disc and the preset pressure value, and can only relieve pressure once, unable to provide sustainable pressure relief. The technical solution of this utility model mainly replaces the existing explosion-proof disc with the cooperation of a top-holding spring and a sealing gasket. When the internal air pressure of the battery box increases, and the force exerted by the air pressure on the sealing gasket is greater than the holding elastic force exerted by the top-holding spring on the sealing gasket, the air pressure can drive the sealing gasket to compress in conjunction with the top-holding spring, opening the air inlet so that the air pressure enters the air passage chamber and is continuously discharged through the exhaust hole to relieve pressure. When the internal air pressure of the battery box is low, and the force exerted by the air pressure on the sealing gasket is less than the holding elastic force exerted by the top-holding spring on the sealing gasket, the top-holding spring returns to its normal state, and the air inlet is closed. Therefore, in this technical solution, as long as the air pressure generated inside the battery box is greater than the holding force of the top spring, the gas can be gradually and continuously discharged to the outside through the air inlet. There is no need to use disposable explosion-proof sheets for venting, which would increase costs. The internal pressure will not be stored, which not only extends the service life of the explosion-proof valve structure, but also effectively prevents the battery from bulging. Furthermore, the explosion-proof valve structure in this technical solution, while maintaining the continuous venting function, can also quickly burst open and release pressure instantly when faced with instantaneous high-pressure gas inside the battery. It also has the instantaneous pressure release function of existing explosion-proof sheets, combining continuous pressure release and instantaneous pressure release functions, which greatly extends the service life of the power battery.
[0021] (2) In this technical solution, a holding spring with a very small holding force can be selected. In this way, even if the air pressure reaches a small value, it can still be discharged. Thus, the internal pressure of the battery box will not accumulate to the critical value that the battery can withstand, making it easier to carry out sustainable pressure relief and effectively protect the battery.
[0022] (3) Compared with the existing explosion-proof sheet, the high temperature generated during welding during the welding process will affect the size of the preset value of the explosion-proof sheet, resulting in the unstable burst function of the product; in this technical solution, the top holding spring is not affected by temperature, and the replacement cost is low. Top holding springs of various specifications and sizes can be used. According to the burst value requirements, it can be applied to various usage scenarios, providing more choices for the market.
[0023] (4) In this technical solution, a pressure-relief space is set between the waterproof and breathable membrane and the air passage cavity. In this way, after the gas passes through the waterproof and breathable membrane, it can be depressurized and buffered in the pressure-relief space, and will not act on the sealing gasket quickly, causing the sealing gasket to bounce and shift instantly under the action of the top holding spring, thus affecting the service life of the top holding spring. In addition, the design of the pressure-relief space also makes it easy for gas to accumulate in it. If the actual holding force of the top holding spring is designed to be too high, and the pressure of the internal gas is less than the holding force and cannot open the air inlet, the gas can accumulate in the pressure-relief space after passing through the waterproof and breathable membrane. When it accumulates to a sufficient amount, it can generate enough pressure to open the air inlet. Therefore, even if the top holding spring is selected with incorrect specifications, there is no need to worry too much about the inability to continuously depressurize. The continuous depressurization function of the product is extremely stable.
[0024] (5) In this technical solution, the setting of the limiting structure effectively prevents the top holding spring from being non-parallel to the axis of the stepped sleeve, and the axial displacement of the top holding spring will tilt, resulting in the elastic holding force being blocked and reduced.
[0025] (6) In this technical solution, the sealing gasket is configured as a soft sealing gasket and the top holding spring is configured as a V-shaped top holding spring; in this way, even if the pressure inside the battery box is less than the holding elastic force of the top holding spring, the pressure acting on the soft sealing gasket can cause it to deform slightly and open part of the air inlet, further ensuring that the continuous pressure relief function of the product tends to be stable.
[0026] (7) The stepped sleeve is detachably screwed into the rupture hole, making the explosion-proof valve structure extremely easy to disassemble and assemble. If the electrolyte inside the battery is insufficient and a secondary electrolyte injection operation is required, or if repair or replacement is needed, this connection method is very easy to achieve. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the explosion-proof valve structure installed on an existing cover plate body according to an embodiment of the present utility model;
[0029] Figure 2 for Figure 1 Overall exploded view;
[0030] Figure 3 for Figure 1 Exploded cross-sectional view;
[0031] Figure 4This is a cross-sectional view of the explosion-proof valve structure installed on an existing cover plate body according to an embodiment of the present invention. Figure 1 ;
[0032] Figure 5 This is a cross-sectional view of the explosion-proof valve structure installed on an existing cover plate body according to an embodiment of the present invention. Figure 2 .
[0033] The annotations in the attached figures are explained as follows:
[0034] 1. Cover plate body; 11. Bursting hole; 12. Mounting groove;
[0035] 2. Explosion-proof valve structure; 21. Pressure relief kit; 211. Stepped sleeve; 211A. Air inlet; 211B. Exhaust port; 211C. Limiting ring; 211D. Inclined platform; 212. Outer cover; 213. Air passage chamber; 22. Sealing assembly; 221. Sealing gasket; 221A. Disc part; 221B. Circular part; 222. Top holding spring;
[0036] 3. Limiting structure;
[0037] 4. Waterproof and breathable membrane; 5. Pressure relief space; 6. Sealing ring. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0039] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.
[0040] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.
[0041] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.
[0042] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".
[0043] Please see Figures 1 to 5 .
[0044] This embodiment provides a novel explosion-proof valve structure 2 with sustainable pressure relief. Its structure is simple, easy to implement, and low in cost. It mainly solves the problem that existing explosion-proof valve structures 2 rely too heavily on the quality of the explosion-proof disc and a preset pressure value, and can only relieve pressure once, unable to provide sustainable pressure relief. This embodiment's structure mainly includes a pressure relief kit 21 and a sealing assembly 22; see [link to documentation]. Figures 2 to 4 The explosion-proof valve structure 2 is installed on the cover plate body 1, which is welded to the battery box body (not shown), to seal the blast hole 11 on the cover plate body 1; wherein,
[0045] The pressure relief kit 21 includes a stepped sleeve 211 inserted and fixed on the rupture hole 11, and an outer cover 212 covering the exposed opening at one end of the stepped sleeve 211. The stepped sleeve 211 is partially exposed and in contact with the outside. The stepped sleeve 211 has an air passage chamber 213 for placing the sealing assembly 22. The air passage chamber 213 is connected to the inside of the battery box through the air inlet 211A at the other end of the stepped sleeve 211, and is connected to the outside through the exhaust hole 211B on the side wall of the stepped sleeve 211. There are several exhaust holes 211B, and each exhaust hole 211B is equally spaced around the outer peripheral wall of the stepped sleeve 211 to improve the pressure relief and exhaust efficiency and prevent a large amount of gas from accumulating inside the air passage chamber 213.
[0046] In this embodiment, the stepped sleeve 211 is a stepped sleeve; the venting cavity 213 connects the inside and outside of the battery box. The venting cavity 213 is used to receive the gas flowing into the battery box and then allow the gas to be discharged to the outside after passing through it. That is, because high pressure is generated inside the battery box, when the battery box is connected to the outside through the venting cavity 213, the gas flows rapidly from the high pressure direction to the low pressure direction and is automatically discharged to the outside.
[0047] In this embodiment, the exposed opening at one end of the stepped sleeve 211 faces outward, and the air inlet 211A at the other end faces inward into the battery box; the opening cover is provided with an outer cover 212. In actual installation, the sealing components 22 can be placed in the air passage chamber 213 by opening the outer cover 212, which facilitates production and installation.
[0048] In this embodiment, the outer periphery of the stepped sleeve 211 and the inner wall of the rupture hole 11 are provided with matching threads (not shown in the figure). The stepped sleeve 211 is detachably screwed into the rupture hole 11, making the assembly and disassembly of the explosion-proof valve structure 2 extremely convenient. If the electrolyte inside the battery is insufficient and a secondary electrolyte injection operation is required, or if repair or replacement is needed, this connection method is very easy to achieve. In other embodiments, the stepped sleeve 211 and the rupture hole 11 can also be connected by welding or riveting.
[0049] Since the stepped sleeve 211 and the cover plate body 1 are connected by screws, a certain degree of sealing is required. In this embodiment, an installation groove 12 is formed on the cover plate body 1, and a sealing ring 6 (the sealing ring 6 is made of rubber) is provided in the installation groove 12; the thickness of the sealing ring 6 is greater than the groove depth of the installation groove 12; when the stepped sleeve 211 is inserted into the rupture hole 11, the stepped sleeve 211 acts on the sealing ring 6 and compresses the thickness of the sealing ring 6 to be equal to the groove depth of the installation groove 12. In this way, the installation groove 12 can not only be used to place the sealing ring 6, but its groove depth design can also control the compression of the sealing ring 6, avoiding over-pressure and insufficient compression of the sealing ring 6 during production and subsequent replacement, thus ensuring the sealing performance. Other embodiments, such as welding or riveting, can also adopt this design to prevent air leakage in the explosion-proof valve.
[0050] A sealing assembly 22 is used to open and close the air inlet 211A that communicates with the inside of the battery box in the venting chamber 213. The sealing assembly 22 includes a sealing gasket 221 and a holding spring 222 disposed in the venting chamber 213. The holding spring 222 is axially disposed on the outer cover 212 through the limiting structure 3, and its axis is parallel to the axis of the stepped sleeve 211. The holding spring 222 axially presses against the end face of the sealing gasket 221, causing the sealing gasket 221 to move axially and form a seal with the inner wall surface of the stepped sleeve 211 to close the air inlet 211A.
[0051] When high pressure is generated due to gas accumulation inside the battery box, the high-pressure gas acts on the sealing gasket 221, causing the top holding spring 222 to be axially compressed. This causes the sealing gasket 221 to open the air inlet 211A, allowing for continuous pressure relief and exhaust. When the gas pressure inside the battery box is low, the gas also acts on the sealing gasket 221, but the gas pressure is less than the holding elastic force of the top holding spring 222. Therefore, the top holding spring 222 will return to its axial position, causing the sealing gasket 221 to close the air inlet 211A.
[0052] The specific principle of the sealing gasket 221 opening and closing the air inlet 211A is as follows: When the air pressure inside the battery box increases, the force of the air pressure acting on the sealing gasket 221 is greater than the holding elastic force of the top spring 222 acting on the sealing gasket 221. The air pressure can drive the sealing gasket 221 to compress in conjunction with the top spring 222, opening the air inlet 211A so that the air pressure enters the air passage chamber 213 and is continuously discharged and relieved through the exhaust hole 211B. When the air pressure inside the battery box is small, the force of the air pressure acting on the sealing gasket 221 is less than the holding elastic force of the top spring 222 acting on the sealing gasket 221. The top spring 222 returns to its normal state, and the air inlet 211A is closed.
[0053] In this embodiment, the holding spring 222 is a cylindrical ordinary spring with an axis formed at its center. The limiting structure 3 is a limiting hole located at the center of the inner end face of the outer cover 212. When the holding spring 222 is axially inserted into the limiting hole through the axis, the holding spring 222 will be vertically positioned at the center of the outer cover 212. In this way, part of the outer peripheral wall of the holding spring 222 will come into contact with the wall of the limiting hole, constraining the radial displacement of the holding spring 222. This limits the parallelism between the axis of the holding spring 222 and the axis of the stepped sleeve 211, effectively preventing the axis of the holding spring 222 from being non-parallel to the axis of the stepped sleeve 211, thus preventing the axial displacement of the holding spring 222 from tilting and reducing the elastic holding force. Of course, in other embodiments, the limiting structure 3 can also be a columnar body, that is, a columnar body extending upward from the center of the outer cover 212, with the holding spring 222 fitting inside the columnar body, which can also achieve radial constraint of the holding spring 222.
[0054] In this embodiment, the diameter of the limiting hole is less than or equal to the diameter of the cylindrical support spring 222. When the diameter of the limiting hole is equal to the diameter of the cylindrical support spring 222, the two walls can just contact each other, thus achieving a radial constraint effect. When the diameter of the limiting hole is less than the diameter of the cylindrical support spring 222, due to the elasticity of the spring itself, the bottom of the support spring 222 deforms and contracts in the radial direction to cooperate with the limiting hole. In this way, the two walls can not only contact each other, but also generate an interaction force to fasten them, preventing the support spring 222 from shifting position, and further ensuring that the axis of the support spring 222 is parallel to the axis of the stepped sleeve 211.
[0055] In this embodiment, the sealing gasket 221 is configured as either a soft or a hard sealing gasket 221; this embodiment first takes a hard sealing gasket 221 as an example. Since the supporting spring 222 is a common spring, it has elasticity but also a certain degree of hardness. When the sealing gasket 221 also has a certain degree of hardness, (see...) Figure 4Unrestricted by the shape and structure of the holding spring 222, the sealing gasket 221 is subjected to the gas inside the battery box, and the axial compression or reset of the holding spring 222 will result in a straight up-and-down displacement; similarly, if the sealing gasket 221 is also made of soft material, although it can also move straight up and down, the displacement may change if the shape and structure of the holding spring 222 changes.
[0056] Further, see Figure 4 and Figure 5 The top holding spring 222 is configured as a V-shaped top holding spring 222, while the sealing gasket 221 is a soft sealing gasket 221; during assembly, the top (larger diameter) of the top holding spring 222 is inserted into the limiting hole, and its bottom (smaller diameter) acts on the end face of the sealing gasket 221; when the air pressure inside the battery box acts on the sealing gasket 221, see Figure 5 The sealing gasket 221 is softly deformed against the bottom of the holding spring 222 (as a fulcrum) and can be tilted to open the air inlet 211A. In this way, even if the pressure inside the battery box is less than the holding elastic force of the holding spring 222, the pressure acting on the soft sealing gasket 221 can cause it to deform slightly and open part of the air inlet 211A, further ensuring that the continuous pressure relief function of the product tends to be stable.
[0057] In this embodiment, see Figure 3 and Figure 4 The sealing gasket 221 also includes an integrally formed disc portion 221A and an annular portion 221B; the outer periphery of the disc portion 221A is inclined and chamfered, and the inner wall surface of the stepped sleeve 211 forms an inclined platform 211D; the top holding spring 222 can pass through the inner cavity of the annular portion 221B along the axial direction and abut against the end face of the disc portion 221A, driving the outer periphery of the disc portion 221A to tightly adhere to the wall surface of the inclined platform 211D to form an inclined surface fit seal. This reasonable structural design is more conducive to saving the internal space of the air passage 213.
[0058] In this embodiment, the outer periphery of the disc portion 221A is tightly attached to the wall surface of the inclined platform 211D to form a sloped fit seal, which is the first seal; the outer diameter of the annular portion 221B is equal to the inner diameter of the air passage 213. When the holding spring 222 is axially compressed, the outer wall surface of the annular portion 221B can be aligned and tightly attached to the exhaust hole 211B on the side wall of the stepped sleeve 211 to seal the exhaust hole 211B, which is the second seal; when the holding spring 222 is axially reset, the outer wall surface of the annular portion 221B can be misaligned with the exhaust hole 211B on the side wall of the stepped sleeve 211 to open the exhaust hole 211B. Therefore, when the top spring 222 is axially compressed, the air inlet 211A and the exhaust port 211B open simultaneously; when the top spring 222 is axially reset, the air inlet 211A and the exhaust port 211B close simultaneously. In this way, when the battery box does not vent, the air passage 213 closes its connection with the outside, which can effectively prevent external dust and liquid from entering.
[0059] In this embodiment, see Figure 3 and Figure 4 A limiting ring 211C is formed on the inner peripheral wall of the stepped sleeve 211, and the limiting ring 211C is located at the air inlet 211A. A waterproof and breathable membrane 4 is welded on the limiting ring 211C, and a pressure-relieving space 5 is formed between the waterproof and breathable membrane 4 and the air passage 213. The air pressure inside the battery box can enter the air passage 213 in sequence through the waterproof and breathable membrane 4 and the pressure-relieving space 5.
[0060] In this embodiment, the waterproof and breathable membrane 4 is a one-way waterproof and breathable membrane 4. This one-way waterproof and breathable membrane 4 is an existing design product, and this embodiment mainly uses it directly, without further details on its specific structure. Therefore, in this embodiment, external gases, liquids, and other substances cannot enter the battery through the exhaust port 211B, the air passage chamber 213, and the air inlet 211A to cause any impact. Furthermore, considering that in extreme cases the entire explosion-proof valve body may not be able to keep up with the battery's gas production rate during normal exhaust, the waterproof and breathable membrane 4 is designed to rupture under a certain air pressure to aid in exhaust.
[0061] In this embodiment, a pressure-relief space 5 is provided between the waterproof and breathable membrane 4 and the air passage 213. This allows the gas to be partially depressurized and buffered within the pressure-relief space 5 after passing through the waterproof and breathable membrane 4, preventing it from rapidly acting on the sealing gasket 221 and causing it to bounce instantly under the action of the holding spring 222, thus affecting the lifespan of the holding spring 222. Furthermore, the design of the pressure-relief space 5 facilitates gas accumulation. If the holding force of the actual holding spring 222 is designed to be too high, and the internal gas pressure is less than the holding force, preventing the air inlet 211A from opening, the gas can accumulate in the pressure-relief space 5 after passing through the waterproof and breathable membrane 4. When sufficient gas accumulates, it can generate enough pressure to open the air inlet 211A. Therefore, even if the specifications of the holding spring 222 are incorrect, there is no need to worry too much about the inability to continuously relieve pressure, as the product's continuous pressure relief function is extremely stable.
[0062] In this embodiment, the material selection for the pressure relief kit 21 can be based on actual needs, such as aluminum or steel; while the screw connection method of the main material in this embodiment has lower requirements for material selection and correspondingly lower cost.
[0063] Working principle and usage process of this utility model:
[0064] During assembly, see Figure 3 and Figure 4 First, place the sealing ring 6 into the mounting groove 12 of the cover plate body 1; second, open the outer cover 212 and place the sealing gasket 221 into the air passage 213, so that the outer periphery of the disc portion 221A of the sealing gasket 221 is tightly attached to the wall surface of the inclined platform 211D of the stepped sleeve 211; third, vertically set the top spring 222 in the center of the outer cover 212, so that the outer peripheral wall of the top spring 222 is in contact with the wall of the limiting hole, so that the top spring 222 will not move radially (the top spring 222 can be pre-positioned after being placed in the limiting hole in the center of the outer cover 212, and then the two are connected and fixed by ultrasonic welding); fourth, cover the outer cover 212 onto the exposed opening of the stepped sleeve 211 (the outer cover 212 and the opening can be screwed together). (Fixed by direct welding or riveting), and the top holding spring 222 at the center of the outer cover 212 is held against the end face of the sealing gasket 221, so that the outer periphery of the disc portion 221A of the sealing gasket 221 is completely pressed against the wall surface of the inclined platform 211D of the stepped sleeve 211 to form a seal; Fifth, the waterproof and breathable membrane 4 is ultrasonically welded to the limiting ring 211C on the inner peripheral wall of the stepped sleeve 211; At this time, the assembly of the entire explosion-proof valve structure 2 is completed, and the outer periphery of the stepped sleeve 211 and the inner wall surface of the rupture hole 11 are screwed and tightened, wherein the stepped sleeve 211 acts on the sealing ring 6, and the thickness of the sealing ring 6 is pressed to be equal to the groove depth of the mounting groove 12, thus completing the constraint and fixation of the explosion-proof valve structure 2 and the cover body 1; Finally, the cover body 1 is welded to the battery box.
[0065] In actual use, when high pressure is generated due to gas accumulation inside the battery box, the high-pressure gas acts on the sealing gasket 221, causing the top spring 222 to compress axially. This, in turn, opens the air inlet 211A, allowing for continuous pressure relief and venting. When the gas pressure inside the battery box is low, the gas still acts on the sealing gasket 221, but the gas pressure is less than the holding force of the top spring 222. Therefore, the top spring 222 will return to its axial position, closing the air inlet 211A in conjunction with the sealing gasket 221. Furthermore, if high pressure is generated due to rapid gas accumulation inside the battery box, the high pressure will quickly act on the sealing gasket 221 and the top spring 222, causing the outer cover 212 to burst open rapidly, providing instantaneous pressure relief. This also provides the instantaneous pressure relief function of existing explosion-proof valves. Therefore, this invention has a simple structure, is easy to implement, and is low in cost. It primarily solves the problem that existing explosion-proof valve structures rely too heavily on the quality of the explosion-proof valve and the preset pressure value, and can only provide one-time pressure relief, unable to provide continuous pressure relief. The technical solution of this utility model mainly replaces the existing explosion-proof sheet by cooperating with the top holding spring 222 and the sealing gasket 221. When the air pressure inside the battery box increases, and the force of the air pressure acting on the sealing gasket 221 is greater than the holding elastic force of the top holding spring 222 acting on the sealing gasket 221, the air pressure can drive the sealing gasket 221 to compress in conjunction with the top holding spring 222, opening the air inlet 211A so that the air pressure enters the air passage chamber 213 and is continuously discharged and relieved through the exhaust hole 211B. When the air pressure inside the battery box is small, and the force of the air pressure acting on the sealing gasket 221 is less than the holding elastic force of the top holding spring 222 acting on the sealing gasket 221, the top holding spring 222 returns to its normal state, and the air inlet 211A is closed. Therefore, in this technical solution, as long as the gas pressure generated inside the battery box is greater than the holding force of the top spring 222, the gas can be gradually and continuously discharged to the outside through the air inlet 211A. There is no need to use disposable explosion-proof sheets for venting, which would increase costs. The internal pressure will not be stored, which not only extends the service life of the explosion-proof valve structure 2, but also effectively prevents the battery from bulging. Furthermore, while maintaining the continuous venting function, the explosion-proof valve structure 2 in this technical solution can also quickly burst open and release pressure instantly when faced with instantaneous high-pressure gas inside the battery. It also has the instantaneous pressure release function of existing explosion-proof sheets, combining continuous pressure release and instantaneous pressure release functions, which greatly extends the service life of the power battery.
[0066] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.
Claims
1. A novel explosion-proof valve structure with sustainable pressure relief, which is installed on a cover plate body welded to a battery box body to seal the rupture hole on the cover plate body, characterized in that: The explosion-proof valve structure includes a pressure relief kit and a sealing assembly; wherein... The pressure relief kit includes a stepped sleeve inserted and fixed on the rupture hole, and an outer cover covering an exposed opening at one end of the stepped sleeve, the stepped sleeve being partially exposed and in contact with the outside; the stepped sleeve has an internal venting chamber for placing the sealing assembly; the venting chamber communicates with the inside of the battery box through an air inlet at the other end of the stepped sleeve, and is connected to the outside through an exhaust hole on the side wall of the stepped sleeve; A sealing assembly includes a sealing gasket and a holding spring disposed within the air passage cavity; the holding spring is axially disposed on the outer cover via a limiting structure, and its axis is parallel to the axis of the stepped sleeve; the holding spring axially presses against the end face of the sealing gasket, causing the sealing gasket to move axially and form a seal with the inner wall surface of the stepped sleeve, thereby closing the air inlet; The air pressure inside the battery box acts on the sealing gasket, causing the top holding spring to compress axially or return to its original position, thereby opening and closing the air inlet in conjunction with the sealing gasket.
2. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 1, characterized in that: The inner peripheral wall of the stepped sleeve forms a limiting ring, which is located at the air inlet. A waterproof and breathable membrane is welded onto the limiting ring, and a pressure-reducing space is formed between the waterproof and breathable membrane and the air passage cavity. The air pressure inside the battery box can sequentially enter the air passage cavity through the waterproof and breathable membrane and the pressure-reducing space.
3. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 2, characterized in that: The limiting structure is a limiting hole located at the center of the inner end face of the outer cover; the top holding spring is axially inserted into the limiting hole, so that the outer peripheral wall of the top holding spring part is in contact with the wall of the limiting hole, thereby constraining the displacement of the top holding spring in the radial direction, so as to limit the axis of the top holding spring to be parallel to the axis of the stepped sleeve.
4. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 3, characterized in that: The diameter of the limiting hole is less than or equal to the diameter of the top holding spring.
5. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 3, characterized in that: The sealing gasket is configured as a soft sealing gasket, and the top holding spring is configured as a V-shaped top holding spring; the top of the top holding spring is inserted into the limiting hole, and its bottom acts on the end face of the sealing gasket; when the air pressure inside the battery box acts on the sealing gasket, the sealing gasket is softly deformed against the bottom of the top holding spring and can be tilted to open the air inlet.
6. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 5, characterized in that: The sealing gasket also includes an integrally formed disc portion and an annular portion; the outer periphery of the disc portion is inclined and chamfered, and the inner wall surface of the stepped sleeve is formed with an inclined platform; the top holding spring can pass through the inner cavity of the annular portion along the axial direction and hold the end face of the disc portion, driving the outer periphery of the disc portion to be tightly attached to the wall surface of the inclined platform to form an inclined surface fit seal.
7. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 6, characterized in that: When the top holding spring is axially compressed, the outer wall surface of the annular portion can be aligned and tightly attached to the vent hole of the stepped sleeve side wall to seal the vent hole; when the top holding spring is axially reset, the outer wall surface of the annular portion can be misaligned with the vent hole of the stepped sleeve side wall to open the vent hole.
8. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 1, characterized in that: The cover plate body has an installation groove, and a sealing ring is provided in the installation groove; the thickness of the sealing ring is greater than the groove depth of the installation groove; when the stepped sleeve is inserted into the rupture hole, the stepped sleeve acts on the sealing ring and presses the thickness of the sealing ring to be equal to the groove depth of the installation groove.
9. A novel explosion-proof valve structure with sustainable pressure relief as described in any one of claims 1 to 8, characterized in that: The stepped sleeve is detachably screwed into the blast hole.
10. The novel explosion-proof valve structure with sustainable pressure relief as described in claim 1, characterized in that: The stepped sleeve sidewall has several vent holes, and each vent hole is arranged at equal intervals around the outer peripheral wall of the stepped sleeve.