Riveting-based anti-explosion valve structure and battery cover plate

Abstract

The utility model discloses a riveting-based explosion-proof valve structure and a battery cover plate, and the riveting-based explosion-proof valve structure comprises an annular groove which is formed in a cover plate main body and is arranged in an outward offset manner relative to a blast hole; the sealing element is sleeved in the annular groove, and the height of the sealing element is greater than the depth of the annular groove; the sealing cover side wall is formed by extending the cover plate main body along the height direction, and is folded and covered towards the direction of the annular groove so as to press against the explosion-proof membrane; a protruding part is formed on the inner side face of the sealing cover side wall. The sealing piece is arranged in the annular groove, and the explosion-proof membrane covers the sealing piece; the sealing cover side wall is folded and pressed against the explosion-proof membrane, and the inner side surface acts on the explosion-proof membrane to indirectly press against the sealing piece to deform, so that the inner side surface of the sealing cover side wall is parallel to the outer edge of the cover plate main body; according to the anti-explosion valve structure and the battery cover plate provided by the invention, the problems that a specified explosion value cannot be reached or the explosion value is relatively low and the service life of a battery is shortened due to the fact that tiny air holes are generated in a welding seam after welding and heat conduction of an existing anti-explosion valve structure are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to an explosion-proof valve structure and a battery cover plate based on riveting. Background Art

[0002] Currently, electrochemical energy storage boasts technical advantages such as rapid response, high energy density, flexible configuration, and a short construction cycle. Electrochemical energy storage technologies primarily include lithium-ion batteries, lead-acid batteries, all-vanadium flow batteries, sodium-sulfur batteries, and nickel-hydrogen batteries. In recent years, the vigorous development of the new energy vehicle and energy storage industries has driven rapid growth in my country's demand for lithium-ion batteries. This growth has also significantly increased demand for lithium-ion battery structural components. With the rapid development of the battery structural component industry and the increasing product requirements of OEMs, various battery structural component companies are fiercely competing for a larger market share, resulting in an increasing number and variety of battery structures and increasingly improved product quality.

[0003] In the existing lithium battery structure, the cover body must be equipped with an explosion-proof valve to ensure the safety of battery use. When the pressure inside the battery exceeds the set explosion threshold of the explosion-proof valve under high pressure, the explosion-proof valve will rupture, effectively preventing explosion due to excessive pressure. This is one of the extremely important measures for safe use.

[0004] However, most of the existing explosion-proof valves on the cover body are fixed to the cover by welding. During the welding process, the threshold value set by the explosion-proof valve is seriously affected by the heat of welding. That is, the heat generated during welding will greatly affect the explosion threshold after welding, and the welding area is prone to pores, or even explosions. These tiny pores cannot be observed with the naked eye and can only be detected by professional equipment, such as helium airtightness testing and X-ray detection. More importantly, the thickness of the trace joint may be shallower than the thickness set for the explosion threshold, which causes the explosion-proof valve to rupture before reaching the set threshold, and the battery becomes unusable, resulting in the battery being scrapped before the set service life, which reduces the battery life. This significantly increases the cost for consumers.

[0005] In summary, the explosion-proof effect of existing explosion-proof valves depends entirely on welding technical experience, parameters, the accuracy of welding equipment, etc. The quality of cover plate blasting depends to a certain extent on the welding effect. Under this condition, it is not only not conducive to market competition but also increases new competitive pressure. Utility Model Content

[0006] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology, and to provide an explosion-proof valve structure and battery cover based on riveting, which have a simple structure, simple production, easy implementation and low cost, and solve the problem that the existing explosion-proof valve structure produces tiny pores or welds in the weld after welding heat conduction, resulting in the inability to reach the specified explosion value or the explosion value is too low, thereby reducing the battery life.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A riveted explosion-proof valve structure is used to install an explosion-proof diaphragm on a cover plate body and seal the explosion hole on the cover plate body; the explosion-proof valve structure includes: an annular groove formed on the cover plate body, a sealing side wall and a sealing member;

[0009] an annular groove, which is provided on the cover plate body and is offset outward relative to the blasting hole;

[0010] A sealing member is sleeved in the annular groove, and the height of the sealing member is greater than the depth of the annular groove;

[0011] The sealing side wall is formed by extending the cover plate body in the height direction and folded toward the annular groove to press against the explosion-proof membrane; the inner side surface of the sealing side wall forms a convex portion;

[0012] The sealing member is placed in an annular groove and is covered with an explosion-proof diaphragm; the sealing side wall is folded and pressed against the explosion-proof diaphragm, and the inner side surface acts on the explosion-proof diaphragm to indirectly press the sealing member to deform, and make the inner side surface of the sealing side wall parallel to the outer edge of the cover body.

[0013] Furthermore, a hook portion is formed on the outer edge of the explosion-proof membrane; an embedding groove is provided on the cover plate body and located between the annular groove and the sealing side wall, and the embedding groove is for the hook portion to be embedded in, so as to limit the explosion-proof membrane from escaping from the sealing range of the sealing member when the sealing side wall is pressed against the explosion-proof membrane.

[0014] Furthermore, the groove depth of the annular groove is greater than the groove depth of the engaging groove, and the thickness of the sealing member is greater than the height of the hook portion.

[0015] Furthermore, the explosion-proof diaphragm is provided with a buffering bend portion in the form of an annular shape, which separates the explosion-proof diaphragm into an assembly portion and a diaphragm main body portion. The diaphragm main body portion and the buffering bend portion are located in the blasting hole of the cover plate body, and the connecting position of the buffering bend portion and the assembly portion is against the edge of the blasting hole; the assembly portion is clamped between the cover side wall and the sealing member.

[0016] Furthermore, a tearing portion is formed at the junction of the buffering curved portion and the diaphragm main body, and the tearing portion is arranged in a stepped groove.

[0017] Furthermore, the groove depth of the tearing portion is 0.069-0.07 mm.

[0018] Furthermore, a recessed portion is formed on the outer surface of the cover side wall, and the recessed portion corresponds to the raised portion on the inner surface; wherein the recessed portion is used to withstand thrust so that the cover side wall bends toward the seal, and the raised portion corresponds to the seal.

[0019] Furthermore, a plurality of gap grooves are provided on the cover side wall, so that the cover side wall is divided into a plurality of straight side walls and a plurality of curved side walls.

[0020] A battery cover plate, whose sealing cover is arranged on the battery shell; the battery cover plate comprises a cover plate body, a pole and a plastic sealing part; and also comprises the explosion-proof valve structure, which is used to rivet the explosion-proof diaphragm to the explosion hole arranged at the center of the cover plate body.

[0021] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides an explosion-proof valve structure and a battery cover plate based on riveting, which has a simple structure, is easy to manufacture, easy to implement and has low cost, and solves the problem that the existing explosion-proof valve structure generates tiny pores or welds in the welds after welding heat conduction, resulting in the failure to reach the specified explosion value or the explosion value is too low, thereby reducing the service life of the battery; the present invention changes the traditional welding method of the explosion-proof plate and adopts the cold pressure riveting method for assembly, thereby removing the heat effect generated during welding and no longer considering the impact of temperature on the explosion value, that is, the original explosion value of the explosion-proof plate is realized, and the explosion value after being installed on the cover plate body does not change; there is no need to worry about pores, explosion holes, etc. generated after welding, and the airtightness of the entire explosion-proof valve structure is good; more importantly, it is possible to measure whether the sealing ring is in a good condition by measuring the external dimensions. In the sealed state, the present invention forms a raised portion on the inner side surface of the sealing side wall. It is only necessary to ensure that the sealing side wall is folded and pressed and the raised portion acts on the explosion-proof diaphragm and the seal, and the outer surface of the sealing side wall is parallel to the horizontal plane, so as to ensure that the raised portion presses against the seal. By limiting the height of the raised portion, the compression of the seal can be controlled between 25% and 35%, avoiding the reduction of the sealing effect due to excessive compression, and at the same time avoiding the reduction of the service life of the seal due to excessive compression; the entire explosion-proof valve structure is simple to assemble, the manufacturing process is simple and easy to implement, and the reliability is high, and the cost of subsequent testing is low. Compared with the existing method of airtightness testing through inert gas, the difficulty of subsequent testing after riveting is greatly reduced, the reliability is good, and there is no need to consider the problem of changes in the burst value;

[0023] (2) The present invention forms a hook portion on the outer edge of the explosion-proof diaphragm, and cooperates with the embedding groove of the cover body, so that when the cover side wall presses against the explosion-proof diaphragm, the movement of the explosion-proof diaphragm can be restricted, which not only prevents the explosion-proof diaphragm from leaving the sealing range of the seal, but also restricts the explosion-proof diaphragm to remain straight and not easily deformed during the riveting process; in addition, the groove depth of the annular groove is greater than the groove depth of the embedding groove, and the thickness of the seal is greater than the height of the hook portion, so as to avoid the situation where the hook portion cannot be placed in the embedding groove, or the hook portion first hits the bottom of the embedding groove, resulting in the explosion-proof diaphragm and the seal not being in contact, thereby ensuring the stability of the entire structure;

[0024] (3) The explosion-proof diaphragm of the present invention is also provided with an annular buffer bend portion, and the explosion-proof diaphragm is divided into an assembly portion and a diaphragm main body. During the riveting process, when the cover side wall applies pressure to the explosion-proof diaphragm, the explosion-proof diaphragm is easily pulled, which will cause the tear portion on the explosion-proof diaphragm to be easily subjected to horizontal and outward pulling force, resulting in the risk of thinning of the tear portion (the thinning of the tear portion directly affects the explosion value). The buffer bend portion isolates the pulling force generated when the assembly portion and the cover side wall cooperate, and does not affect the tear portion opened on the diaphragm main body, thereby reducing the risk of deformation of the tear portion;

[0025] (4) The present invention sets the tearing portion at the junction of the buffer bend portion and the diaphragm body, which is less susceptible to pulling during riveting and more likely to break when the preset burst value is reached; in addition, the tearing portion is arranged in a stepped manner, which has a faster response speed when the preset pressure value (burst value) is reached;

[0026] (5) The present invention also forms a recessed portion on the outer surface of the side wall of the cover, which not only facilitates the application of force during riveting, but also allows further pressure to be applied thereafter to ensure that the corresponding raised portion can be pressed against the seal, thereby improving the sealing reliability.

[0027] (6) The present invention provides a plurality of gap grooves on the side wall of the cover, which are divided into a plurality of straight side walls and curved side walls. In this way, during the riveting process, it is not easy for the curved side wall to generate an internal gap due to excessive curvature when it is bent, and the riveting effect is better. In addition, during the riveting process, each side wall expands in all directions to supplement part of the gap groove, thereby ensuring that the bursting membrane and the sealing component are stably pressed together. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic diagram of the exploded structure of the battery cover with the explosion-proof valve structure of the present invention;

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the battery cover with explosion-proof valve structure according to the present invention Figure 1 ;

[0031] Figure 3 Schematic diagram of the three-dimensional structure of the battery cover with explosion-proof valve structure according to the present invention Figure 2 ;

[0032] Figure 4 A three-dimensional cross-sectional view of the cover plate body of the present invention;

[0033] Figure 5 A three-dimensional cross-sectional view of a battery cover with an explosion-proof valve structure according to the present invention;

[0034] Figure 6 The present invention Figure 5 Enlarged view of part C in the middle. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In the claims, description and drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" is for distinguishing different objects rather than for describing a specific order.

[0037] In the claims, specification and above-mentioned drawings of the present invention, unless otherwise expressly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific scope of protection of the present invention.

[0038] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" should be understood in a broad sense, that is, any connection method without any displacement relationship or relative rotation relationship between the two parties, that is, including non-detachable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or elements.

[0039] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0040] See also Figure 1-6 This embodiment uses a riveted explosion-proof valve structure, which is used to install the explosion-proof diaphragm 2 on the cover body 1 and seal the explosion hole 11 on the cover body 1. It should be noted that the explosion hole 11 is required to be opened on the existing battery cover to prevent the battery from exploding due to excessive internal pressure after long-term use and aging. Therefore, when the internal pressure reaches a certain level, the pressure is released through the tearing part of the explosion-proof diaphragm 2.

[0041] The explosion-proof valve structure includes:

[0042] The annular groove 12, the sealing side wall 13 and the sealing member 3 are formed on the cover body 1;

[0043] The annular groove 12 is provided on the cover body 1 and is offset outward relative to the blasting hole 11. The annular groove 12 is used to install the sealing member 3. The depth of the annular groove 12 is less than the height of the sealing member 3.

[0044] The sealing member 3 is sleeved in the annular groove 12, and the height of the sealing member 3 is greater than the depth of the annular groove 12;

[0045] The cover side wall 13 is formed by extending the cover plate body 1 in the height direction and folded toward the annular groove 12 to press against the explosion-proof membrane 2; the inner side surface of the cover side wall 13 forms a protrusion 131;

[0046] It should be noted that the cover side wall 13 is the portion that is folded under the riveting pressure, and a recessed portion 132 is formed on the outer surface of the cover side wall 13, and the recessed portion 132 corresponds to the raised portion 131 on the inner surface; wherein the recessed portion 132 is used to withstand the thrust, so that the cover side wall 13 is bent toward the sealing member 3 and the raised portion 131 is pressed against the sealing member 3;

[0047] A hook portion 21 is formed on the outer edge of the explosion-proof diaphragm 2; and an engaging groove 14 is formed on the cover plate body 1 at a position between the annular groove 12 and the sealing side wall 13. The engaging groove 14 is for the hook portion 21 to engage with, so as to prevent the explosion-proof diaphragm 2 from moving along the center of the blasting hole 11 and leaving the sealing range of the seal 3 when the sealing side wall 13 is pressed against the explosion-proof diaphragm 2. This ensures that it is not easily deflected during the riveting process, and the displacement movement will not affect the sealing performance and subsequent testing and calculation of the sealing deformation value.

[0048] Among them, the sealing member 3 is placed in the annular groove 12, and the explosion-proof membrane 2 is covered on the sealing member 3; the sealing side wall 13 is folded and pressed against the explosion-proof membrane 2, and the inner side surface acts on the explosion-proof membrane 2 to indirectly press the sealing member 3 to deform, and make the inner side surface of the sealing side wall 13 parallel to the outer edge of the cover plate body 1.

[0049] More specifically, the depth of the annular groove 12 is greater than the depth of the engaging groove 14, and the thickness of the sealing member 3 is greater than the height of the hook portion 21. This prevents the hook portion 21 from being unable to be placed in the engaging groove 14, or the hook portion 21 from first contacting the bottom of the engaging groove 14, resulting in no contact between the explosion-proof diaphragm 2 and the sealing member 3, thereby ensuring the stability of the entire structure.

[0050] More specifically, the explosion-proof membrane 2 is provided with a buffering bent portion 22 in an annular shape, which divides the explosion-proof membrane 2 into an assembly portion 23 and a membrane main body 24. The membrane main body 24 and the buffering bent portion 22 are located in the blasting hole 11 of the cover body 1, and the connecting position of the buffering bent portion 22 and the assembly portion 23 is against the edge of the blasting hole 11. The assembly portion 23 is sandwiched between the cover side wall 13 and the seal 3; during the riveting process, the cover side wall When the wall 13 applies pressure to the explosion-proof diaphragm 2, it is easy to pull the explosion-proof diaphragm 2, which will cause the tear portion 25 on the explosion-proof diaphragm 2 to be easily subjected to horizontal and outward pulling force, resulting in the risk of thinning of the tear portion 25 (the thinning of the tear portion 25 directly affects the explosion value). The buffering bent portion 22 isolates the pulling force generated when the assembly portion 23 cooperates with the sealing side wall 13, and does not affect the tear portion 25 opened on the diaphragm main body 24, thereby reducing the risk of deformation of the tear portion 25.

[0051] More specifically, a tearing portion 25 is formed at the junction of the buffering curved portion 22 and the diaphragm main body 24, and the tearing portion 25 is arranged in a stepped groove. In this embodiment, the groove depth of the tearing portion 25 is 0.069-0.07 mm.

[0052] More specifically, a plurality of gap grooves 130 are provided on the sealing side wall 13, so that the sealing side wall 13 is divided into a plurality of straight side walls 133 and a plurality of curved side walls 134; in this way, during the riveting process, the curved side wall 134 is not likely to generate an internal gap due to excessive curvature when bending, and the riveting effect is better. In addition, during the riveting process, each sealing side wall 13 expands in all directions to partially supplement the gap groove 130, thereby ensuring that the bursting membrane and the sealing member 3 are stably pressed together.

[0053] For specific implementation, see Figure 1-6 The present invention is illustrated by taking a battery cover equipped with an explosion-proof structure as an example. The battery cover mainly includes the following parts: a cover body 1, a blasting hole 11, an upper annular groove 12, a sealing side wall 13, a protruding portion 131, a recessed portion 132, an engaging groove 14, an explosion-proof diaphragm 2, a hook portion 21, a buffering bent portion 22, an assembly portion 23, a diaphragm body 24, a tearing portion 25, a sealing member 3, a terminal (not shown in the figure), and a plastic sealing member (not shown in the figure);

[0054] During actual assembly and testing:

[0055] (1) The cover body 1 is made of an aluminum sheet, with a blasting hole 11 in the middle, and an annular groove 12, an engaging groove 14 and a sealing side wall 13 formed concentrically and sequentially outwardly from the edge of the blasting hole 11;

[0056] It should be noted that the depth of the annular groove 12 is greater than the depth of the engaging groove 14, and the thickness of the sealing member 3 is greater than the height of the hook portion 21 on the explosion-proof diaphragm 2;

[0057] (2) Install the annular seal 3 into the corresponding annular groove 12. At this time, the seal 3 is partially exposed outside the annular groove 12 and will be covered with the explosion-proof diaphragm 2 later;

[0058] (3) The explosion-proof diaphragm 2 is made of a special metal material (existing technology) and has an annular hook portion 21 formed on its outer periphery for subsequent insertion into the engaging groove 14. The explosion-proof diaphragm 2 is then pressed twice. The first pressing forms a buffering bent portion 22, and the buffering bent portion 22 is used to separate the assembly portion 23 and the diaphragm main body 24. The second pressing forms a tearing portion 25 on the diaphragm main body 24. It should be noted that the tearing portion 25 is a stepped groove with a groove depth of 0.069-0.07 mm.

[0059] (4) The explosion-proof diaphragm 2 is placed on the corresponding explosion-proof hole, and the hook portion 21 on the assembly portion 23 is placed in the engaging groove 14. At this time, the explosion-proof diaphragm 2 is placed on the sealing member 3, and the buffering bent portion 22 is located in the explosion hole 11; at the same time, the buffering bent portion 22 and the diaphragm main body 24 are located in the explosion hole 11;

[0060] (5) The sealing side wall 13 is pressed toward the explosion-proof membrane 2 by a riveting device. It should be noted that the sealing side wall 13 is divided into several parts, especially the arc-shaped curved part, so as to reduce the wall thickness accumulation caused by the distortion during bending and prevent the sealing side wall 13 from not pressing against the explosion-proof membrane 2. In addition, each sealing side wall 13 is provided with a raised portion 131 and a recessed portion 132. The recessed portion 132 is acted upon by the riveting device to form a force point to push the sealing side wall 13 toward the explosion-proof membrane 2, while the raised portion 131 acts on the explosion-proof membrane 2, so that the position of the explosion-proof membrane 2 corresponding to the raised portion 131 is subjected to greater force, thereby being able to more tightly press the explosion-proof membrane 2 and the sealing member 3, so that the sealing member 3 is deformed.

[0061] (6) Finally, the poles and the plastic seal are installed on the cover body 1 to complete the cover body 1, and then the cover body 1 is sent for inspection; after passing the inspection, it is packaged with the battery box containing battery fluid.

[0062] During detection,

[0063] During the first inspection, the riveted cover plate body 1 is sent to the inspection table and cross-sectionally projected using X-ray inspection equipment. When the outer surface 13A of the cover side wall 13 is parallel to the lower surface 1A of the cover plate body 1, the deformation of the seal 3 is between 20-35% (which can be calculated based on the height difference of the seal 3). If it is within this range, the product is considered qualified. If it is greater than 35% or less than 20%, the protrusion 131 is adjusted accordingly, and the protrusion 131 is subsequently manufactured within this size range. Subsequent inspections only require external inspection to determine whether the outer surface 13A of the cover side wall 13 is parallel to the lower surface 1B of the cover plate body 1. Of course, fluctuations within a certain range are allowed on the basis of qualification.

[0064] This speeds up the manufacturing and testing process and enables external inspection without the need for expensive and inefficient testing methods.

[0065] The present invention provides an explosion-proof valve structure and a battery cover plate based on riveting, which have a simple structure, are easy to manufacture, easy to implement and have low cost, and solve the problem that the existing explosion-proof valve structure generates tiny pores or welds in the welds after welding heat conduction, resulting in the failure to achieve the specified explosion value or the explosion value is too low, thereby reducing the service life of the battery; the present invention changes the traditional method of welding explosion-proof plates and adopts a cold pressure riveting method for assembly, thereby eliminating the heat effect generated during welding and no longer considering the impact of temperature on the explosion value, that is, the original explosion value of the explosion-proof plate is achieved, and the explosion value after installation on the cover plate body does not change; there is no need to worry about pores, explosion holes, etc. generated after welding, and the airtightness of the entire explosion-proof valve structure is good; more importantly, it can be measured by measuring the external dimensions In order to check whether the sealing ring is in a sealed state, a convex portion is formed on the inner side surface of the sealing side wall in the present invention. It is only necessary to ensure that the sealing side wall is folded and pressed and the convex portion acts on the explosion-proof diaphragm and the seal, and the outer surface of the sealing side wall is parallel to the horizontal plane, so as to ensure that the convex portion is pressed against the seal. By limiting the height of the convex portion, the compression amount of the seal can be controlled between 25% and 35%, avoiding the reduction of the sealing effect due to excessive compression, and avoiding the reduction of the service life of the seal due to excessive compression; the entire explosion-proof valve structure is simple to assemble, the manufacturing process is simple and easy to implement, and the reliability is high, the later detection cost is low, and compared with the existing method of airtightness detection by inert gas, the difficulty of later detection after riveting is greatly reduced, and the reliability is high. The invention also forms a hook portion on the outer edge of the explosion-proof membrane, which cooperates with the engaging groove of the cover body, so that when the cover side wall is pressed against the explosion-proof membrane, the movement of the explosion-proof membrane can be restricted, which not only prevents the explosion-proof membrane from leaving the sealing range of the seal, but also restricts the explosion-proof membrane from remaining straight and is not easy to deform during the riveting process; in addition, the groove depth of the annular groove is greater than the groove depth of the engaging groove, and the thickness of the sealing member is greater than the height of the hook portion, so as to avoid the situation where the hook portion cannot be placed in the engaging groove, or the hook portion first hits the bottom of the engaging groove, resulting in the explosion-proof membrane and the sealing member not contacting each other, thereby ensuring the stability of the entire structure; the explosion-proof membrane of the invention also forms an annular buffer curved portion, and The explosion-proof diaphragm is divided into an assembly portion and a diaphragm main portion. During the riveting process, when the cover side wall applies pressure to the explosion-proof diaphragm, the explosion-proof diaphragm is easily pulled, which will cause the tear portion on the explosion-proof diaphragm to be easily subjected to horizontal and outward pulling force, resulting in the risk of thinning of the tear portion (the thinning of the tear portion directly affects the bursting value). The buffering bend isolates the pulling force generated when the assembly portion and the cover side wall cooperate, and does not affect the tear portion opened on the diaphragm main portion, thereby reducing the risk of deformation of the tear portion. The present invention arranges the tear portion at the junction of the buffering bend and the diaphragm main body, which means that it is not easily pulled during riveting and is more likely to rupture when the preset bursting value is reached. In addition, the tear portion is arranged in a stepped manner, which has a faster response speed when the preset pressure value (bursting value) is reached.The present invention also forms a recessed portion on the outer surface of the cover side wall, which not only facilitates the application of force during riveting, but also allows for additional pressure to be applied thereafter, ensuring that the corresponding raised portion can press against the seal, thereby enhancing sealing reliability. The present invention also provides several clearance grooves on the cover side wall, which are divided into several straight side walls and curved side walls. This prevents the curved side walls from generating internal gaps due to excessive curvature during the riveting process, thereby enhancing the riveting effect. Furthermore, during the riveting process, the side walls expand in all directions, partially filling the clearance grooves and ensuring stable compression of the bursting disc and seal.

[0066] The above description and embodiments are used to explain the protection scope of the present invention, but do not constitute a limitation on the protection scope of the present invention.

Claims

1. An explosion-proof valve structure based on riveting, which is used to install the explosion-proof diaphragm on the cover body and seal the explosion hole on the cover body; characterized in that: The explosion-proof valve structure comprises: an annular groove formed on the cover plate body, a sealing side wall and a sealing member; An annular groove is provided on the cover plate body and is offset outward relative to the blasting hole; A sealing member is sleeved in the annular groove, and the height of the sealing member is greater than the depth of the annular groove; The sealing side wall is formed by extending the cover plate body in the height direction and folded in the direction of the annular groove to press against the explosion-proof membrane; the inner side surface of the sealing side wall forms a convex portion; Among them, the sealing member is placed in an annular groove and is covered with an explosion-proof membrane; the side wall of the cover is folded and pressed against the explosion-proof membrane, and the inner side surface acts on the explosion-proof membrane to indirectly press against the deformation of the sealing member, and makes the inner side surface of the side wall of the cover parallel to the outer edge of the cover body.

2. The explosion-proof valve structure based on riveting according to claim 1, characterized in that: A hooking portion is formed on the outer edge of the explosion-proof membrane; an embedding groove is provided on the cover plate body and between the annular groove and the sealing side wall, and the hooking portion is embedded in the embedding groove to limit the explosion-proof membrane from leaving the sealing range of the sealing member when the sealing side wall presses against the explosion-proof membrane.

3. The explosion-proof valve structure based on riveting according to claim 2, characterized in that: The groove depth of the annular groove is greater than the groove depth of the embedding groove, and the thickness of the sealing element is greater than the height of the hooking portion.

4. The explosion-proof valve structure based on riveting according to claim 2, characterized in that: The explosion-proof membrane is provided with a buffering bent portion in the form of an annular shape, which separates the explosion-proof membrane into an assembly portion and a membrane main body portion. The membrane main body portion and the buffering bent portion are located in the blasting hole of the cover plate body, and the connecting position of the buffering bent portion and the assembly portion is against the edge of the blasting hole; the assembly portion is clamped between the side wall of the cover and the sealing member.

5. The explosion-proof valve structure based on riveting according to claim 4, characterized in that: A tearing portion is formed at the junction of the buffer bending portion and the main body of the diaphragm, and the tearing portion is arranged in a stepped groove.

6. The explosion-proof valve structure based on riveting according to claim 5, characterized in that: The groove depth of the tearing portion is 0.069-0.07 mm.

7. The explosion-proof valve structure based on riveting according to claim 1, characterized in that: A recessed portion is also formed on the outer side surface of the cover side wall, and the recessed portion corresponds to the raised portion on the inner side surface; wherein the recessed portion is used to withstand thrust so that the cover side wall bends toward the seal, and the raised portion corresponds to the seal.

8. The explosion-proof valve structure based on riveting according to claim 7, characterized in that: The sealing side wall is provided with a plurality of gap grooves, so that the sealing side wall is divided into a plurality of straight side walls and a plurality of arc-shaped side walls.

9. A battery cover, wherein the sealing cover is arranged on the battery housing; the battery cover comprises a cover body, a pole and a plastic sealing member; characterized in that: It also includes an explosion-proof valve structure as described in any one of claims 1 to 8, which is used to rivet the explosion-proof diaphragm to the explosion hole at the center of the cover plate body.

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