Battery cover plate explosion-proof valve assembly structure based on riveting process

Abstract

The invention discloses a battery cover plate explosion-proof valve assembly structure based on a riveting process, which is mounted on a steel cover plate of a battery cover plate structure and is used for sealing a blast hole in the steel cover plate. The explosion-proof valve assembly structure is characterized by comprising an aluminum pressing ring, a sealing ring and an explosion-proof sheet, the aluminum pressing ring comprises a ring body, a turnover plate and a limiting plate, and the turnover plate and the limiting plate extend in the axial direction of the ring body. The turnover plate and the limiting plate are arranged in a spaced mode on the inner periphery and the outer periphery, the turnover plate is higher than the limiting plate, and a receding groove used for containing the sealing ring is formed between the turnover plate and the limiting plate; the explosion-proof sheet is attached and fixed to the bottom of the ring body and covers the through hole of the ring body; according to the technical scheme, the structure is simple, manufacturing is easy and convenient, implementation is easy, cost is low, and the problems that an existing steel cover piece and anti-explosion valve assembly structure is high in sealing performance and replacement cost and prone to deformation due to the fact that welding is adopted are mainly solved.

Description

Technical Field

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

[0002] The explosion-proof valves of battery covers currently on the market usually have high burst values. During high-pressure processes, the pressure inside the battery has not yet reached the preset burst value, and the explosion-proof valve has not yet started to work, so the entire battery begins to burst and explode, causing safety issues. Therefore, the existing market has stricter requirements for the burst value of battery cover explosion-proof valves.

[0003] However, in the existing lithium battery structure, the cover plate and the explosion-proof valve are welded together by steel materials. The use of steel materials makes the explosion value of the explosion-proof valve always remain high at around 2.2, and it is impossible to reduce it significantly. Therefore, in order to reduce the explosion value of the battery cover to around 0.6 to meet market demand, some manufacturers use steel cover plates and aluminum explosion-proof valves. However, since the explosion-proof valve is made of aluminum, the two cannot be directly welded together;

[0004] In this way, some manufacturers first weld the pressure ring in the explosion-proof valve to the steel cover plate, and then place the aluminum explosion-proof plate into the pressure ring, and finally separate the explosion-proof plate through multiple sealing parts to prevent the explosion-proof plate from contacting with the internal electrolyte of the battery, external air or dust to cause corrosion; but this combination and fixing method often leads to the following problems during operation: First, although the sealing of the welding method is guaranteed, welding leaks are inevitable, resulting in sealing problems between the pressure ring and the steel cover plate; second, the welding method is extremely unfavorable for the subsequent replacement of the explosion-proof plate, and the entire battery cover plate structure can only be discarded. The replacement cost is too high and it is easy to cause scrapping; third, the welding method is prone to thermal expansion, and the steel cover plate and the pressure ring are prone to tensile deformation; fourth, there are many sealing parts used, which are easy to cause too much waste, assembly is difficult, material cost and production efficiency are not high, and it is not easy to achieve automation.

[0005] In summary, the existing battery cover explosion-proof valve assembly structure still needs to be further improved to meet actual usage requirements. Summary of the invention

[0006] The present invention provides a battery cover explosion-proof valve assembly structure based on a riveting process, which has a simple structure, is easy to manufacture, easy to implement and has low cost. It mainly solves the problems of sealing, high replacement cost and easy deformation of the existing steel cover and explosion-proof valve assembly structure due to welding. The main technical solutions are as follows:

[0007] A battery cover explosion-proof valve assembly structure based on a riveting process, which is installed on a steel cover sheet of the battery cover structure to seal the explosion hole on the steel cover sheet; characterized in that: the explosion-proof valve assembly structure includes an aluminum pressure ring, a sealing ring, and an explosion-proof sheet; wherein the aluminum pressure ring includes a ring body and a folding plate and a limit plate extending along the axial direction of the ring body; the inner and outer periphery spacing between the folding plate and the limit plate is set, the height of the folding plate is higher than the height of the limit plate, and a space for placing the sealing ring is formed between the folding plate and the limit plate a giveway groove; an explosion-proof plate, which is attached and fixed to the bottom of the ring body and covered on the through hole of the ring body; a sealing ring, which is arranged in the giveway groove, and the height of the sealing ring is higher than the groove depth of the giveway groove; the aluminum pressure ring is riveted to the steel cover piece, and the folding plate is partially folded toward the direction of the outer peripheral limiting plate until the folding plate is pressed against the upper end surface of the steel cover piece, and the limiting plate is axially pressed against the lower end surface of the steel cover piece, so that the height of the sealing ring after compression and deformation is flush with the height of the limiting plate.

[0008] Preferably, when the sealing ring is arranged in the clearance groove, there is an escape space between the sealing ring and the folding plate or the limiting plate, so that the sealing ring can be expanded, compressed and deformed circumferentially in the escape space when subjected to force.

[0009] Preferably, a recessed platform for accommodating the explosion-proof plate is recessed at the bottom of the ring body, and the height of the explosion-proof plate is equal to the depth of the recessed platform; the explosion-proof plate is located in the recessed platform and welded to the ring body, and the bottom of the explosion-proof plate is flush with the bottom of the ring body.

[0010] Preferably, it also includes a protective sticker and a waterproof breathable membrane, the protective sticker is welded to the outer side of the folded part of the folding plate and is arranged parallel to the explosion-proof plate; the waterproof breathable membrane is welded to the bottom surface of the ring body and is connected to the explosion-proof plate cover, and the explosion-proof plate is located between the protective sticker and the waterproof breathable membrane.

[0011] Preferably, the waterproof breathable membrane is arranged parallel to the explosion-proof plate, and the area of ​​the waterproof breathable membrane is larger than the area of ​​the explosion-proof plate.

[0012] Preferably, the folding plate and the limiting plate are arranged in a "ring" shape.

[0013] Preferably, the explosion-proof plate includes a connecting ring for welding with the ring body, and a substrate connected to the inside of the connecting ring, a "C"-shaped tear groove is formed between the connecting ring and the substrate; a connecting portion is also formed between the connecting ring and the substrate; when the substrate is subjected to excessive pressure, it expands and ruptures relative to the connecting ring through the tear groove, and the substrate can be flipped relative to the connecting ring on the connecting portion.

[0014] Preferably, the substrate is recessed with a recessed groove for communicating with the tearing groove, and the recessed groove includes an annular groove body and a plurality of strip groove bodies; the annular groove body is located at the center of the substrate, and a plurality of strip groove bodies are located at equal intervals around the outer periphery of the annular groove body, and the annular groove body is connected with the tearing groove through each of the strip groove bodies.

[0015] Preferably, the groove depths of the annular groove body and the strip groove body are respectively smaller than the groove depth of the tearing groove.

[0016] Preferably, an annular area is constructed inside the annular groove body; a rectangular area is constructed between each of the strip-shaped groove bodies, and each of the rectangular areas is arranged around the outer periphery of the annular groove body at equal intervals.

[0017] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention provides a battery cover plate explosion-proof valve assembly structure based on a riveting process, which has a simple structure, is easy to manufacture, easy to implement and has low cost. It mainly solves the problems of the existing steel cover plate and explosion-proof valve assembly structure having poor sealing due to welding, high replacement cost and easy deformation. The technical solution of the present invention can effectively solve the disadvantages brought by the welding method by riveting, prevent the product from being deformed due to the influence of external force of thermal expansion during the manufacturing process, and if the subsequent explosion-proof plate is damaged and needs to be replaced, the riveting method is also convenient for disassembly and assembly, and the replacement cost is lower; in the present technical solution, the height of the folding plate is higher than the height of the limiting plate, and the height of the sealing ring is higher than the depth of the groove between the folding plate and the limiting plate, so that the height of the sealing ring will also be higher than the height of the limiting plate. When the limiting plate is pressed against the lower end surface of the steel cover plate, the sealing ring is compressed and deformed in the groove until the height is flush with the height of the limiting plate, thereby controlling the force compression amount of the sealing ring by the height of the limiting plate, ensuring that the sealing ring is always in a reasonable deformation state, preventing the sealing ring from being compressed and deformed too much and affecting the service life, and preventing the sealing ring from being compressed and deformed insufficiently and having insufficient sealing performance; therefore, even if the present technical solution is combined by riveting, the sealing between the steel cover plate and the pressure ring can be guaranteed, preventing the battery from leaking and improving safety.

[0019] (2) In the present technical solution, the protective sticker is welded to the outer side surface of the folded portion of the folding plate and is arranged parallel to the explosion-proof plate; the waterproof and breathable membrane is welded to the bottom surface of the ring body and is connected to the explosion-proof plate cover. The explosion-proof plate is located between the protective sticker and the waterproof and breathable membrane. The protective sticker can isolate the external air or dust from contacting the explosion-proof plate, and the waterproof and breathable membrane can isolate the electrolyte inside the battery from contacting the explosion-proof plate, thereby achieving an anti-corrosion effect. This simple and direct welding method uses very few sealing parts, has low material cost, and is simple to assemble. It is very conducive to automation and has higher production efficiency.

[0020] (3) In the present technical solution, the avoidance space between the sealing ring and the folding plate or the limiting plate can provide sufficient deformation space for the sealing ring to prevent the sealing ring from being excessively squeezed and deformed and losing its original elasticity, thereby ensuring the service life of the sealing ring; and the setting of the deformation space can also increase the sealing area of ​​the sealing ring, making the sealing stronger.

[0021] (4) In the present technical solution, a recessed platform is provided at the bottom of the ring body for accommodating the explosion-proof plate. When the explosion-proof plate is located inside the recessed platform, the bottom of the explosion-proof plate and the bottom of the ring body are flush with each other, and the waterproof and breathable membrane is also covered on the explosion-proof plate. In this way, the explosion-proof plate can be hidden in the recessed platform of the ring body and is not in direct contact with the outside. The explosion-proof plate is effectively protected and its service life is increased.

[0022] (5) Compared with the tear groove arranged in a whole circle in the traditional method, when the base sheet of the explosion-proof plate is actually torn and detached, it is easy to be lost and dropped; however, in the present technical solution, the tear groove is in the shape of a "C". Through the connecting part between the connecting ring and the base sheet, the base sheet can be flipped and detached relative to the connecting ring, and is always connected to the side of the connecting ring through the connecting part and will not fall directly. In this way, the torn base sheet is more conducive to subsequent recycling and processing.

[0023] (6) The substrate is provided with an annular groove body and a plurality of strip groove bodies, and the strip groove bodies are arranged at equal intervals around the outer periphery of the annular groove body, and stress points are formed at the connection between the annular groove body and the rectangular groove body, and the distances of the stress points relative to the tear groove are equal; therefore, when the explosion-proof plate is welded, the heat generated by the welding will be evenly transferred to the annular area of ​​the annular groove body through the rectangular area formed by the rectangular groove body, the heat transfer distance is shorter, and the heat is very evenly distributed in each area, and the stress generated by the tear groove and the above stress will produce a mutual force, thereby further reducing the stress to prevent the thickness of the tear groove from being excessively thinned due to the stress when it is cooled. In this way, the thickness of the tear groove can be close to the original thickness, ensuring that the explosion-proof plate can be exploded when the preset thickness is reached, and safety is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of the explosion-proof valve assembly structure and the steel cover plate according to an embodiment of the present invention;

[0026] Figure 2It is a schematic diagram of the explosion of the explosion-proof valve assembly structure and the steel cover plate according to an embodiment of the present invention;

[0027] Figure 3 It is a schematic cross-sectional view of the explosion-proof valve assembly structure and the steel cover plate according to an embodiment of the present invention;

[0028] Figure 4 for Figure 3 A partial enlarged view of part A shown;

[0029] Figure 5 This is a schematic diagram of the structure of a bursting disc according to an embodiment of the present invention;

[0030] Figure 6 is a cross-sectional schematic diagram of a bursting disc according to an embodiment of the present invention;

[0031] Figure 7 for Figure 6 A partial enlarged view of portion B shown;

[0032] Figure 8 This is a schematic diagram of the structure of an aluminum pressure ring according to an embodiment of the present invention;

[0033] The following are the descriptions of the reference numerals:

[0034] 1. Steel cover; 11. Blasting hole;

[0035] 2. Aluminum pressing ring; 21. Ring body; 211. Through hole; 212. Sinking platform; 22. Folding plate; 23. Limiting plate; 24. Giving way groove; 25. Avoidance space;

[0036] 3. Sealing ring;

[0037] 4. explosion-proof disk; 41. connecting ring; 42. base plate; 421. tearing groove; 422. recessed groove; 4221. annular groove body; 4222. strip groove body; 43. connecting part; H. annular area; G. rectangular area;

[0038] 5. Protective film;

[0039] 6. Waterproof and breathable membrane. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0041] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0042] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., 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 protection scope of the present invention.

[0043] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0044] 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".

[0045] See also Figures 1 to 8 .

[0046] The present embodiment provides a battery cover plate explosion-proof valve assembly structure based on a riveting process, which has a simple structure, is easy to manufacture, easy to implement and has low cost, and mainly solves the problems of sealing, high replacement cost and easy deformation of the existing steel cover plate 1 and explosion-proof valve assembly structure due to welding; the battery cover plate explosion-proof valve assembly structure is installed on the steel cover plate 1 of the battery cover plate structure to seal the blasting hole 11 on the steel cover plate 1; in this embodiment, see Figure 1 and Figure 2 The explosion-proof valve assembly structure mainly includes an aluminum pressure ring 2, a sealing ring 3, and an explosion-proof disk 4; among them,

[0047] Aluminum pressure ring 2, see Figure 2 and Figure 3 , which includes a ring body 21 and a folding plate 22 and a limiting plate 23 extending axially along the ring body 21; the folding plate 22 and the limiting plate 23 are arranged at an inner and outer periphery spacing, the height of the folding plate 22 is higher than the height of the limiting plate 23, and a clearance groove 24 for placing the sealing ring 3 is formed between the folding plate 22 and the limiting plate 23;

[0048] In this embodiment, the aluminum pressure ring 2 is made of aluminum material, which is mainly arranged in an annular shape; the folding plate 22 and the limiting plate 23 are located above the ring body 21, and both are arranged in an annular shape. In the original state without riveting, the folding plate 22 is a vertical plate extending along the axial direction of the ring body 21 (the folding plate 22 and the limiting plate 23 have the same shape, and the internal area is relatively small), and its plate height is higher than the height of the limiting plate 23; and the limiting plate 23 is offset relative to the outer periphery of the folding plate 22; therefore, in this embodiment, the shape of the giving groove 24 is also annular, so as to accommodate the sealing ring 3;

[0049] The explosion-proof disc 4 is made of aluminum material, and is attached and fixed to the bottom of the ring body 21, and covers the through hole 211 of the ring body 21; the explosion-proof disc 4 can expand and rupture to discharge the internal gas when the pressure is too large; the shape of the explosion-proof disc 4 is the same as that of other existing explosion-proof discs 4, and is oblate;

[0050] The sealing ring 3 is elastic and is arranged in the clearance groove 24, and the height of the sealing ring 3 is higher than the groove depth of the clearance groove 24; the initial height of the sealing ring 3 mainly plays the role of the preset height, that is, the sealing ring 3 can be compressed and deformed by the external force until the overall height is higher or lower than the groove depth of the clearance groove 24. In this embodiment, the role of the sealing ring 3 is crucial, and not only the sealing performance but also the sustainable service life must be guaranteed; if the sealing ring 3 is subjected to too much pressure and the amount of compression deformation is too large, it will cause excessive deformation of the sealing ring 3, which will affect the service life of the sealing ring 3 in the long run, and if the pressure is too small and the amount of compression deformation is insufficient, the sealing effect cannot be guaranteed either. Therefore, the limiting plate 23 in this embodiment can effectively solve this problem, see Figure 5 When the aluminum pressure ring 2 is riveted to the steel cover sheet 1, the folding plate 22 is partially folded toward the direction of the outer limiting plate 23 until the folding plate 22 is pressed against the upper end surface of the steel cover sheet 1, and the aluminum pressure ring 2 will move toward the lower end surface of the steel cover sheet 1 until the limiting plate 23 is axially pressed against the lower end surface of the steel cover sheet 1, so that the sealing ring 3 in the positioning groove 24 is compressed and deformed by the force, and due to the pressing effect of the limiting plate 23, the height of the sealing ring 3 is flush with the height of the limiting plate 23;

[0051] In this embodiment, during the riveting process, the entire aluminum pressure ring 2 moves toward the lower end of the steel cover sheet 1, and the clearance groove 24 drives the sealing ring 3 to move until it first abuts against the lower end of the steel cover sheet 1. As it continues to move until the limiting plate 23 abuts against the lower end of the steel cover sheet 1, the displacement stops, and the sealing ring 3 is correspondingly restricted and cannot continue to deform, and the height of the sealing ring 3 will be flush with the height of the limiting plate 23. Therefore, in this embodiment, as long as the overall height of the limiting plate 23 is adjusted and its height is preset to a suitable value, the sealing performance and service life of the sealing ring 3 can be guaranteed, which is convenient for subsequent automated production and ensures the yield rate of each product.

[0052] In this embodiment, when the sealing ring 3 is arranged in the clearance groove 24, there is an escape space 25 between the sealing ring 3 and the folding plate 22 or the limiting plate 23, so that the sealing ring 3 can be expanded and compressed in the circumferential direction in the escape space 25 when subjected to force. The escape space 25 can provide sufficient deformation space for the deformation of the sealing ring 3, preventing the sealing ring 3 from being excessively squeezed and deformed and losing its original elasticity, and the setting of the deformation space can also increase the sealing effect area of ​​the sealing ring 3.

[0053] In this embodiment, see Figure 5 A sink 212 for accommodating the explosion-proof disc 4 is recessed at the bottom of the ring body 21, and the height of the explosion-proof disc 4 is equal to the depth of the sink 212; the explosion-proof disc 4 is located in the sink 212 and welded to the ring body 21, and the bottom of the explosion-proof disc 4 is flush with the bottom of the ring body 21.

[0054] In this embodiment, see Figure 2 and Figure 5 , also includes a protective sticker 5 and a waterproof breathable membrane 6, the protective sticker 5 is welded to the outer side of the folded part of the folding plate 22, and is arranged parallel to the corresponding explosion-proof piece 4; the waterproof breathable membrane 6 is attached and welded to the bottom surface of the ring body 21, and is covered and connected with the explosion-proof piece 4, and the explosion-proof piece 4 is located between the protective sticker 5 and the waterproof breathable membrane 6; and the waterproof breathable membrane 6 is arranged parallel to the explosion-proof piece 4, and the area of ​​the waterproof breathable membrane 6 is larger than the area of ​​the explosion-proof piece 4, so that the waterproof breathable membrane 6 can directly cover the entire explosion-proof piece 4.

[0055] In this embodiment, see Figure 6 The explosion-proof disk 4 includes a connecting ring 41 for welding with the ring body 21, and a base plate 42 connected to the inside of the connecting ring 41, a "C"-shaped tear groove 421 is formed between the connecting ring 41 and the base plate 42; a connecting portion 43 is also formed between the connecting ring 41 and the base plate 42; see Figure 8 , the base sheet 42 is subjected to excessive pressure and ruptures relative to the connecting ring 41 through the tearing groove 421, and the base sheet 42 can be turned over relative to the connecting ring 41 on the connecting portion 43. In this embodiment, the connecting portion 43 is misaligned with the tearing groove 421, that is, the connecting portion 43 is located at the opening of the "C"-shaped tearing groove 421.

[0056] In this embodiment, see Figure 6The substrate 42 is provided with a recessed groove 422 for communicating with the tearing groove 421, and the recessed groove 422 includes an annular groove body 4221 and a plurality of strip groove bodies 4222; the annular groove body 4221 is located at the center of the substrate 42, and a plurality of strip groove bodies 4222 are arranged around the outer periphery of the annular groove body 4221 at equal intervals, and the annular groove body 4221 is connected with the tearing groove 421 through each strip groove body 4222. An annular area H is constructed inside the annular groove body 4221; a rectangular area G is constructed between each strip groove body 4222, and each rectangular area G is arranged around the outer periphery of the annular groove body 4221 at equal intervals.

[0057] In this embodiment, see Figure 7 and Figure 8 , the thickness of the connecting portion 43 is equivalent to the thickness of the entire substrate 42; the thickness of the tear groove 421 is less than the thickness of the recessed groove 422, that is, the groove depths of the annular groove body 4221 and the strip groove body 4222 are respectively less than the groove depth of the tear groove 421, and the tear groove 421 is relatively thinner; therefore, when the substrate 42 is subjected to force, the "C"-shaped tear groove 421 breaks, and since there is a connecting portion 43 between the substrate 42 and the connecting ring 41, the substrate 42 will flip over on the connecting portion 43 instead of falling directly.

[0058] In this embodiment, the explosion-proof disc 4 is mainly formed by high-precision die stamping; in this embodiment, the explosion-proof disc 4 needs to be welded to the sink 212 at the bottom of the aluminum pressure ring 2; therefore, heat will be generated during the welding process for heat transfer. If the heat transfer is not interfered with, after the welding cooling is completed, the substrate 42 will shrink and the tear groove 421 will be thinned. In the later stage, the explosion-proof disc 4 will explode directly if it does not reach the preset threshold. Figure 6 In order to interfere with heat transfer, during the welding process, the heat generated can be transferred in the rectangular area G and the annular area H formed by the annular groove body 4221 and the strip groove body 4222, that is, the heat is transferred from each rectangular area G to the middle annular area H, reducing the distance of heat transfer, and it is not necessary to transfer it in the entire substrate 42, so that the stress cannot be released; because the rectangular areas G are annularly distributed around the annular area H and are arranged at equal intervals, each part is heated evenly, and stress points are formed at the connection between the annular groove body 4221 and the rectangular groove body, and mutual forces are generated between the stress points, thereby further alleviating and releasing the stress effect; and during the welding cooling process, the annular groove body 4221 and each strip groove body 4222 will generate mutual forces, and the annular groove body 4221 and the strip groove body 4222 will be slightly thinned, so that the force of the edge position of the substrate 42 contracting inward due to stress can be limited, preventing the tear groove 421 from being excessively thinned, and ensuring the thickness of the tear groove 421.

[0059] See also Figures 1 to 8

[0060] The working principle and use process of the present invention:

[0061] This embodiment includes a steel cover sheet 1, an aluminum pressure ring 2, a sealing ring 3, an explosion-proof sheet 4, a protective sticker 5 and a waterproof breathable membrane 6; during assembly, refer to Figure 2 and Figure 5 ,

[0062] First, the sealing ring 3 is placed in the clearance groove 24 between the folding plate 22 and the limiting plate 23;

[0063] Next, the steel cover sheet 1 and the aluminum pressure ring 2 are riveted and pressed. When the folding plate 22 is pressed, it begins to partially fold in the direction of the limiting plate 23 at the periphery until the folding plate 22 presses against the upper end surface of the steel cover sheet 1, and the aluminum pressure ring 2 also moves toward the lower end surface of the steel cover sheet 1 at the same time. The clearance groove 24 drives the sealing ring 3 to move until it first presses against the lower end of the steel cover sheet 1, and continues to move until the limiting plate 23 presses against the lower end of the steel cover sheet 1 and then stops moving. In this process, the sealing ring 3 in the clearance groove 24 is compressed and deformed by the force, and due to the pressing effect of the limiting plate 23, the height of the sealing ring 3 and the height of the limiting plate 23 will finally remain flush;

[0064] Afterwards, the explosion-proof plate 4 is placed in the sinking platform 212 at the lower end of the aluminum pressure ring 2 until the lower bottom surface of the explosion-proof plate 4 is flush with the lower bottom surface of the aluminum pressure ring 2, and then the aluminum pressure ring 2 is welded to the sinking platform 212; finally, the protective sticker 5 is welded to the outer side surface of the folded part of the folding plate 22, and is arranged parallel to the corresponding explosion-proof plate 4, and the waterproof and breathable membrane 6 is also covered on the explosion-proof plate 4 in the sinking platform 212 for welding; the entire operation process is riveting first and then welding, which is simple to process and convenient for automated production.

[0065] When the actual power battery is in use, refer to Figure 6 and Figure 8, if the internal pressure of the battery reaches the preset value, the "C"-shaped tear groove 421 will first begin to rupture, and then the explosion-proof plate 4 will detach toward the end away from the battery under the action of the internal pressure of the battery, that is, the substrate 42 in the explosion-proof plate 4 will flip relative to the connecting ring 41 through the connecting portion 43, and the pressure inside the battery will be quickly released. In the process of releasing, the substrate 42 will not splash around, but will always be located beside the connecting ring 41 through the connecting portion 43, which is convenient for recycling. If the product needs to be replaced with a new explosion-proof plate 4 later, the steel-aluminum riveting of the steel cover plate 1 and the aluminum pressure ring 2 can be easily disassembled and assembled. It only needs to use a milling cutter to directly cut the folding plate 22 of the aluminum pressure ring 2, and the entire explosion-proof valve structure will fall off directly. Therefore, the present invention has a simple structure, is easy to make, easy to implement and low cost, and mainly solves the problems of sealing, high replacement cost and easy deformation of the existing steel cover plate 1 and explosion-proof valve assembly structure due to welding. The technical solution of the present invention adopts the riveting method to effectively solve the disadvantages brought by the welding method, prevent the product from being deformed due to the influence of external force of thermal expansion during the manufacturing process, and if the explosion-proof plate 4 is damaged and needs to be replaced later, the riveting method is also convenient for disassembly and assembly, and the replacement cost is lower; in this technical solution, the height of the folding plate 22 is higher than the height of the limiting plate 23, and the height of the sealing ring 3 is higher than the depth of the groove 24 between the folding plate 22 and the limiting plate 23, so that the height of the sealing ring 3 will also be higher than the height of the limiting plate 23, when the limiting plate 23 is pressed against the steel cover plate 1 When the sealing ring 3 is at the lower end face, it is compressed and deformed in the make way groove 24 until its height is flush with the height of the limit plate 23. The compression amount of the sealing ring 3 is controlled by the height of the limit plate 23 to ensure that the sealing ring 3 is always in a reasonable deformation state, to prevent the sealing ring 3 from being compressed and deformed too much and affecting its service life, and to prevent the sealing ring 3 from being compressed and deformed insufficiently and having insufficient sealing performance. Therefore, even if the technical solution is combined by riveting, the sealing between the steel cover plate 1 and the pressure ring can be guaranteed to prevent leakage of the battery and improve safety.

[0066] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A battery cover plate explosion-proof valve assembly structure based on riveting technology, which is installed on a steel cover plate of a battery cover plate structure to seal the explosion hole on the steel cover plate; characterized in that: The explosion-proof valve assembly structure includes an aluminum pressure ring, a sealing ring, and an explosion-proof disk; wherein, An aluminum pressure ring, comprising a ring body and a folding plate and a limiting plate extending axially along the ring body; the folding plate and the limiting plate are arranged at an inner and outer periphery spacing, the height of the folding plate is higher than the height of the limiting plate, and a clearance groove for placing the sealing ring is formed between the folding plate and the limiting plate; An explosion-proof plate, which is attached and fixed to the bottom of the ring body and covers the through hole of the ring body; A sealing ring is arranged in the clearance groove, and the height of the sealing ring is higher than the depth of the clearance groove; The aluminum pressure ring is riveted to the steel cover plate, and the folding plate is partially folded toward the direction of the outer peripheral limiting plate until the folding plate is pressed against the upper end surface of the steel cover plate, and the limiting plate is axially pressed against the lower end surface of the steel cover plate, so that the height of the sealing ring after compression and deformation is flush with the height of the limiting plate.

2. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 1, characterized in that: When the sealing ring is arranged in the clearance groove, there is an escape space between the sealing ring and the folding plate or the limiting plate, so that the sealing ring can be expanded, compressed and deformed along the circumferential direction in the escape space when subjected to force.

3. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 1, characterized in that: The bottom of the ring body is recessed with a sink for accommodating the explosion-proof plate, and the height of the explosion-proof plate is equal to the depth of the sink; the explosion-proof plate is located in the sink and welded to the ring body, and the bottom of the explosion-proof plate is flush with the bottom of the ring body.

4. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 3, characterized in that: It also includes a protective sticker and a waterproof breathable membrane. The protective sticker is welded to the outer side of the folded part of the folding plate and is arranged parallel to the explosion-proof plate; the waterproof breathable membrane is welded to the bottom surface of the ring body and is connected to the explosion-proof plate cover. The explosion-proof plate is located between the protective sticker and the waterproof breathable membrane.

5. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 4, characterized in that: The waterproof and breathable membrane is arranged parallel to the explosion-proof plate, and the area of ​​the waterproof and breathable membrane is larger than the area of ​​the explosion-proof plate.

6. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 1, characterized in that: The folding plate and the limiting plate are arranged in a "ring" shape.

7. A battery cover explosion-proof valve assembly structure based on riveting technology as claimed in any one of claims 1 to 6, characterized in that: The explosion-proof plate includes a connecting ring for welding with the ring body, and a substrate connected to the inside of the connecting ring, a "C"-shaped tear groove is formed between the connecting ring and the substrate; a connecting portion is also formed between the connecting ring and the substrate; when the substrate is subjected to excessive pressure, it expands and ruptures relative to the connecting ring through the tear groove, and the substrate can be turned over relative to the connecting ring on the connecting portion.

8. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 7, characterized in that: The substrate is concavely provided with a recessed groove for communicating with the tearing groove, and the recessed groove includes an annular groove body and a plurality of strip groove bodies; the annular groove body is located at the center of the substrate, and the plurality of strip groove bodies are arranged at equal intervals around the outer periphery of the annular groove body, and the annular groove body is connected with the tearing groove through each of the strip groove bodies.

9. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 8, characterized in that: The groove depths of the annular groove body and the strip groove body are respectively smaller than the groove depth of the tearing groove.

10. The battery cover explosion-proof valve assembly structure based on riveting technology as claimed in claim 9, characterized in that: An annular area is constructed inside the annular groove body; a rectangular area is constructed between each of the strip-shaped groove bodies, and each of the rectangular areas is arranged around the outer periphery of the annular groove body at equal intervals.

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