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

Abstract

The utility model discloses a battery cover plate explosion-proof valve assembly structure based on a riveting process, which is arranged 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 anti-explosion valve assembly structure is simple in structure, easy and convenient to manufacture, easy to implement and low in cost, and mainly solves 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.

Description

Technical Field

[0001] This utility model relates to the field of battery cover technology, specifically to a battery cover explosion-proof valve assembly structure based on riveting process. Background Technology

[0002] Currently, the burst values ​​of explosion-proof valves for battery covers on the market are usually quite high. During high-pressure processes, before the internal pressure of the battery reaches the preset burst value and the explosion-proof valve starts to work, the entire battery begins to burst, causing an explosion, which poses a safety problem. Therefore, the existing market has stricter requirements for the burst values ​​of explosion-proof valves for battery covers.

[0003] However, in existing lithium battery structures, both the cover plate and the explosion-proof valve are welded together from steel. The use of steel keeps the explosion-proof valve's burst value consistently around 2.2, preventing significant reduction. Therefore, some manufacturers, in an effort to reduce the battery cover's burst value to around 0.6 to meet market demand, have combined steel cover plates with aluminum explosion-proof valves. However, since the explosion-proof valve is made of aluminum, the two cannot be directly welded together.

[0004] Therefore, some manufacturers first weld the pressure ring and steel cover plate in the explosion-proof valve, then place the aluminum explosion-proof sheet inside the pressure ring, and finally separate the explosion-proof sheet with multiple sealing parts to prevent corrosion from contact between the explosion-proof sheet and the battery's internal electrolyte, external air, or dust. However, this combination and fixing method often has the following problems during operation: First, although the sealing of the welding method is guaranteed, incomplete welding is inevitable, leading to sealing problems between the pressure ring and the steel cover plate; Second, the welding method is extremely unfavorable for subsequent replacement of the explosion-proof sheet, and the entire battery cover plate structure can only be discarded, resulting in excessive replacement costs and easy scrapping; Third, the welding method is prone to thermal expansion, and the steel cover plate and pressure ring are prone to tensile deformation; Fourth, the use of many sealing parts can easily lead to too much waste, assembly is difficult, material costs and production efficiency are low, and automation is not easy to achieve.

[0005] In conclusion, the existing battery cover explosion-proof valve assembly structure still needs further improvement to meet actual usage requirements. Utility Model Content

[0006] This utility model provides a battery cover explosion-proof valve assembly structure based on riveting technology. It is simple in structure, easy to manufacture, readily achievable, and low in cost. It mainly solves the problems of poor sealing, high replacement costs, and easy deformation in existing steel cover and explosion-proof valve assembly structures that rely on welding. The main technical solution adopted is as follows:

[0007] An explosion-proof valve assembly structure for a battery cover plate based on riveting technology is installed on a steel cover plate of a battery cover plate structure to seal the rupture hole on the steel cover plate. The explosion-proof valve assembly structure includes an aluminum pressure ring, a sealing ring, and an explosion-proof plate. The aluminum pressure ring includes 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 spaced apart circumferentially, the height of the folding plate is higher than the height of the limiting plate, and a space is formed between the folding plate and the limiting plate for placing the sealing ring. The ring has a clearance groove; an explosion-proof sheet is attached and fixed to the bottom of the ring body and covers the through hole of the ring body; a sealing ring is disposed in the clearance groove, and the height of the sealing ring is higher than the groove depth of the clearance groove; the aluminum pressure ring is riveted to the steel cover plate; the folding plate is partially folded towards the outer periphery of the limiting plate until the folding plate presses against the upper end face of the steel cover plate, and the limiting plate is axially pressed against the lower end face of the steel cover plate, so that the height of the sealing ring after compression deformation is flush with the height of the limiting plate.

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

[0009] Preferably, the bottom of the ring body is recessed to accommodate the explosion-proof plate, the height of the explosion-proof plate is equal to the depth of the recess; the explosion-proof plate is located inside the recess 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 further includes a protective sticker and a waterproof and breathable membrane. The protective sticker is welded to the outer side of the folded portion of the folding plate and is arranged parallel to the explosion-proof sheet. The waterproof and breathable membrane is attached and welded to the bottom surface of the ring and is covered and connected to the explosion-proof sheet. The explosion-proof sheet is located between the protective sticker and the waterproof and breathable membrane.

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

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

[0013] Preferably, the explosion-proof sheet includes a connecting ring for welding to the ring body and a substrate connected inside 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. If the substrate is subjected to excessive pressure, it expands and ruptures relative to the connecting ring through the tear groove. The substrate can be flipped relative to the connecting ring at the connecting portion.

[0014] Preferably, the substrate is recessed with a groove for communicating with the tear groove. The recessed groove includes an annular groove and a plurality of strip grooves. The annular groove is located at the center of the substrate, and the plurality of strip grooves are arranged at equal intervals around the outer periphery of the annular groove. The annular groove communicates with the tear groove through each of the strip grooves.

[0015] Preferably, the depths of the annular groove and the strip groove are both less than the depth of the tear groove.

[0016] Preferably, an annular region is constructed inside the annular groove; a rectangular region is constructed between each of the strip grooves, and each of the rectangular regions is arranged at equal intervals around the outer periphery of the annular groove.

[0017] 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:

[0018] (1) This utility model provides a battery cover explosion-proof valve assembly structure based on riveting process. It has a simple structure, is easy to manufacture, easy to implement and has low cost. It mainly solves the problems of poor sealing, high replacement cost and easy deformation caused by welding in the existing steel cover and explosion-proof valve assembly structure. The technical solution of this utility model effectively solves the drawbacks of welding by using riveting, preventing product deformation due to thermal expansion during manufacturing. Furthermore, if the explosion-proof sheet needs replacement later, riveting facilitates disassembly and assembly, resulting in lower replacement costs. In this 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 clearance groove between the folding plate and the limiting plate. Thus, the height of the sealing ring is also higher than the height of the limiting plate. When the limiting plate is pressed against the lower end face of the steel cover, the sealing ring is compressed and deformed within the clearance groove until its height is flush with the height of the limiting plate. This controls the amount of compression on the sealing ring by the height of the limiting plate, ensuring that the sealing ring is always under reasonable deformation. This prevents excessive compression deformation from affecting service life, and also prevents insufficient compression deformation from resulting in inadequate sealing performance. Therefore, even when using riveting for assembly, this solution ensures the seal between the steel cover and the pressure ring, preventing battery leakage and improving safety.

[0019] (2) In this technical solution, 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 sheet; the waterproof and breathable membrane is welded to the bottom surface of the ring and is connected to the explosion-proof sheet cover. The explosion-proof sheet 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 sheet, and the waterproof and breathable membrane can isolate the electrolyte inside the battery from contacting the explosion-proof sheet. This achieves the anti-corrosion effect. This simple and direct welding method uses very few sealing parts, has low material cost, and is easy to assemble. It is very conducive to automation and has higher production efficiency.

[0020] (3) In this technical solution, the clearance space between the sealing ring and the folding plate or the limiting plate can provide sufficient deformation space for the deformation of the sealing ring, prevent the sealing ring from being excessively squeezed and deformed and losing its original elasticity, and ensure the service life of the sealing ring; in addition, the setting of the deformation space can also increase the sealing area of ​​the sealing ring and make the sealing performance stronger.

[0021] (4) In this technical solution, a recessed platform is provided at the bottom of the ring body to accommodate the explosion-proof sheet. When the explosion-proof sheet is located inside the recessed platform, the bottom of the explosion-proof sheet is flush with the bottom of the ring body, and the waterproof and breathable membrane is also covered on the explosion-proof sheet. In this way, the explosion-proof sheet can be hidden inside the recessed platform of the ring body and not directly contact the outside. The explosion-proof sheet is effectively protected and its service life is improved.

[0022] (5) Compared with the traditional tear groove set around the whole circle, the substrate of the explosion-proof sheet is easy to be lost and fall off when it is actually torn apart; however, in this technical solution, the tear groove is "C" shaped, and the substrate can be flipped and detached relative to the connecting ring through the connection part between the connecting ring and the substrate. Moreover, the substrate is always connected to the side of the connecting ring through the connection part and will not fall off directly. The torn substrate is more conducive to subsequent recycling and processing.

[0023] (6) The substrate has an annular groove and several strip grooves, and the strip grooves are arranged at equal intervals around the outer periphery of the annular groove. The connection between the annular groove and the rectangular groove forms a stress point, and the distance between each stress point and the tear groove is equal. Therefore, when the explosion-proof sheet is welded, the heat generated by welding will be evenly transferred to the annular area of ​​the annular groove through the rectangular area formed by the rectangular groove. The heat transfer distance is shorter and the heat distribution in each area is very uniform. The stress generated by the tear groove will interact with the above stress, thereby further reducing the stress and preventing the thickness of the tear groove from being excessively thinned due to stress when it cools. In this way, the thickness of the tear groove can approach the original thickness, ensuring that the explosion-proof sheet can explode when the preset time is reached, and the safety is guaranteed. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of the explosion-proof valve assembly structure and the steel cover plate in an embodiment of this utility model;

[0026] Figure 2 This is an exploded view of the explosion-proof valve assembly structure and steel cover plate according to an embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the aluminum pressure ring in an embodiment of the present invention;

[0028] Figure 4 This is a schematic cross-sectional view of the explosion-proof valve assembly structure and steel cover plate according to an embodiment of this utility model;

[0029] Figure 5 for Figure 4 A magnified view of part A shown;

[0030] Figure 6 This is a schematic diagram of the structure of the rupture disc in an embodiment of the present invention;

[0031] Figure 7 This is a cross-sectional schematic diagram of the rupture disc according to an embodiment of the present invention;

[0032] Figure 8 for Figure 7 A magnified view of part B shown;

[0033] The annotations in the attached figures are explained as follows:

[0034] 1. Steel cover plate; 11. Bursting hole;

[0035] 2. Aluminum pressure ring; 21. Ring body; 211. Through hole; 212. Countersunk platform; 22. Folding plate; 23. Limiting plate; 24. Clearance groove; 25. Clearance space;

[0036] 3. Sealing ring;

[0037] 4. Explosion-proof sheet; 41. Connecting ring; 42. Substrate; 421. Tear groove; 422. Recessed groove; 4221. Annular groove; 4222. Strip groove; 43. Connecting part; H. Annular area; G. Rectangular area;

[0038] 5. Screen protector;

[0039] 6. Waterproof and breathable membrane. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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".

[0045] Please see Figures 1 to 8 .

[0046] This embodiment provides a battery cover explosion-proof valve assembly structure based on riveting technology. Its structure is simple, easy to manufacture, readily achievable, and low in cost. It primarily solves the problems of poor sealing, high replacement costs, and easy deformation inherent in existing steel cover plate 1 and explosion-proof valve assembly structures that rely on welding. This battery cover explosion-proof valve assembly structure is installed on the steel cover plate 1 of the battery cover structure to seal the rupture hole 11 on the steel cover plate 1. In this embodiment, see [link to relevant documentation]. Figure 1 and Figure 2The explosion-proof valve assembly structure mainly includes an aluminum pressure ring 2, a sealing ring 3, and an explosion-proof plate 4; among which,

[0047] Aluminum pressure ring 2, see Figure 2 and Figure 3 It includes a ring body 21 and a folding plate 22 and a limiting plate 23 extending along the axial direction of the ring body 21; the folding plate 22 and the limiting plate 23 are spaced apart on their inner and outer circumferences, the height of the folding plate 22 is higher than the height of the limiting plate 23, and a relief 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 and is mainly arranged in a ring shape; the folding plate 22 and the limiting plate 23 are located above the ring body 21, and both are arranged in a ring shape. When it is not riveted and is in its original state, the folding plate 22 is an upright plate extending along the axial direction of the ring body 21 (the folding plate 22 and the limiting plate 23 have the same shape, but the internal area is relatively small), and its plate height is higher than the height of the limiting plate 23; while the limiting plate 23 is offset relative to the outer periphery of the folding plate 22; therefore, in this embodiment, the relief groove 24 is also ring-shaped to accommodate the sealing ring 3.

[0049] The explosion-proof disc 4 is made of aluminum material and is fixed to the bottom of the ring 21 and covers the through hole 211 of the ring 21. The explosion-proof disc 4 can expand and rupture to release the internal gas when it is subjected to excessive pressure. The shape of the explosion-proof disc 4 is the same as that of other existing explosion-proof discs 4, which are all flat and round.

[0050] The sealing ring 3, being elastic, is disposed within the relief groove 24, and its height is greater than the depth of the relief groove 24. The initial height of the sealing ring 3 primarily serves as a preset height, meaning that the sealing ring 3 can be compressed and deformed under external force until its overall height is higher or lower than the depth of the relief groove 24. In this embodiment, the sealing ring 3 plays a crucial role; not only must the sealing performance be guaranteed, but its sustainable service life must also be ensured. If the sealing ring 3 is subjected to excessive pressure or excessive compression deformation, it will lead to excessive deformation, which will affect its service life in the long run. Conversely, if the pressure is too low or the compression deformation is insufficient, the sealing performance will also be compromised. Therefore, the limiting plate 23 in this embodiment effectively solves this problem. (See [reference]). Figure 5 When the aluminum pressure ring 2 is riveted to the steel cover plate 1, the folding plate 22 folds towards the outer periphery of the limiting plate 23 until the folding plate 22 presses against the upper end face of the steel cover plate 1, and the aluminum pressure ring 2 moves towards the lower end face of the steel cover plate 1 until the limiting plate 23 axially presses against the lower end face of the steel cover plate 1, so that the sealing ring 3 in the positioning groove 24 is compressed and deformed by the force, and due to the pressing action 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 towards the lower end of the steel cover plate 1. The clearance groove 24 drives the sealing ring 3 to move until it first presses against the lower end of the steel cover plate 1. As it continues to move until it presses against the lower end of the steel cover plate 1 with the limiting plate 23, the displacement stops. Consequently, the sealing ring 3 is restricted and cannot continue to deform, and the height of the sealing ring 3 becomes 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, facilitating subsequent automated production and ensuring the yield rate of each product.

[0052] In this embodiment, when the sealing ring 3 is disposed within the clearance groove 24, there is a clearance space 25 between the sealing ring 3 and the folding plate 22 or the limiting plate 23, allowing the sealing ring 3 to expand and compress circumferentially within the clearance space 25 under stress. This clearance space 25 provides sufficient deformation space for the deformation of the sealing ring 3, preventing the sealing ring 3 from being excessively compressed and deformed and losing its original elasticity. Furthermore, the deformation space also increases the sealing area of ​​the sealing ring 3.

[0053] In this embodiment, see Figure 5 The bottom of the ring body 21 is recessed with a recessed platform 212 for accommodating the explosion-proof plate 4. The height of the explosion-proof plate 4 is equal to the depth of the recessed platform 212. The explosion-proof plate 4 is located inside the recessed platform 212 and welded to the ring body 21. The bottom of the explosion-proof plate 4 is flush with the bottom of the ring body 21.

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

[0055] In this embodiment, see Figure 6 The explosion-proof sheet 4 includes a connecting ring 41 for welding to the ring body 21, and a substrate 42 connected inside the connecting ring 41. A C-shaped tear groove 421 is formed between the connecting ring 41 and the substrate 42; a connecting portion 43 is also formed between the connecting ring 41 and the substrate 42; see also Figure 8 If the substrate 42 is subjected to excessive pressure, it will expand and rupture relative to the connecting ring 41 through the tear groove 421. The substrate 42 can be flipped relative to the connecting ring 41 on the connecting part 43. In this embodiment, the connecting part 43 is misaligned with the tear groove 421, that is, the connecting part 43 is located at the opening of the "C"-shaped tear groove 421.

[0056] In this embodiment, see Figure 6 The substrate 42 is recessed with a groove 422 for communicating with the tear groove 421. The groove 422 includes an annular groove 4221 and several strip grooves 4222. The annular groove 4221 is located at the center of the substrate 42, and the several strip grooves 4222 are arranged at equal intervals around the outer periphery of the annular groove 4221. The annular groove 4221 communicates with the tear groove 421 through the strip grooves 4222. An annular region H is constructed inside the annular groove 4221. A rectangular region G is constructed between the strip grooves 4222, and the rectangular regions G are arranged at equal intervals around the outer periphery of the annular groove 4221.

[0057] In this embodiment, see Figure 7 and Figure 8 The thickness of the connecting part 43 is comparable 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 4221 and the strip groove 4222 are both 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 because there is a connecting part 43 between the substrate 42 and the connecting ring 41, the substrate 42 will flip on the connecting part 43 instead of falling directly off.

[0058] In this embodiment, the explosion-proof sheet 4 is mainly formed by high-precision die stamping. Since the explosion-proof sheet 4 needs to be welded to the recessed platform 212 at the bottom of the aluminum pressure ring 2, heat will be generated during the welding process. If this heat transfer is not interfered with, after the welding cools down, the substrate 42 will shrink, thinning the tear groove 421. Later, the explosion-proof sheet 4 will explode directly before reaching the preset threshold. (See also...) Figure 6 To interfere with heat transfer, the heat generated during welding can be transferred within the rectangular region G and the annular region H formed by the annular groove 4221 and the strip groove 4222. That is, heat is transferred from each rectangular region G to the central annular region H, reducing the distance of heat transfer and eliminating the need for heat transfer throughout the entire substrate 42, thus preventing stress from being released. Since each rectangular region G is evenly spaced around the annular region H, the heating is uniform, and stress points are formed at the connection between the annular groove 4221 and the rectangular grooves. These stress points interact with each other, further alleviating and releasing stress. Furthermore, during the welding cooling process, the annular groove 4221 and each strip groove 4222 interact with each other, slightly thinning both. This limits the inward contraction force at the edges of the substrate 42 due to stress, preventing excessive thinning of the tear groove 421 and ensuring its thickness.

[0059] See Figures 1 to 8

[0060] Working principle and usage process of this utility model:

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

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

[0063] Next, the steel cover plate 1 and the aluminum pressure ring 2 are riveted together. When the folding plate 22 is pressed, it begins to fold towards the outer periphery of the limiting plate 23 until the folding plate 22 presses against the upper end face of the steel cover plate 1. At the same time, the aluminum pressure ring 2 moves towards the lower end face of the steel cover plate 1. The clearance groove 24 will drive the sealing ring 3 to move until it first presses against the lower end of the steel cover plate 1. As it continues to move until the limiting plate 23 presses against the lower end of the steel cover plate 1, the displacement stops. During this process, the sealing ring 3 in the clearance groove 24 will be compressed and deformed by the force. Due to the pressing action of the limiting plate 23, the height of the sealing ring 3 and the height of the limiting plate 23 will eventually remain flush.

[0064] Next, the explosion-proof sheet 4 is placed inside the recessed platform 212 at the lower end of the aluminum pressure ring 2 until the bottom surface of the explosion-proof sheet 4 is flush with the bottom surface of the aluminum pressure ring 2. Then, the aluminum pressure ring 2 is welded to the recessed platform 212. Finally, the protective sticker 5 is welded to the outer side of the folded part of the folding plate 22 and is set parallel to the explosion-proof sheet 4. The waterproof and breathable membrane 6 is also placed on the explosion-proof sheet 4 inside the recessed platform 212 and welded. The entire operation process is riveting first and then welding, which is simple to process and easy to automate production.

[0065] When using actual power batteries, please refer to... Figure 6 and Figure 8If the internal pressure of the battery reaches a preset value, the "C"-shaped tear groove 421 will first begin to rupture. Then, under the pressure of the battery's internal structure, the explosion-proof sheet 4 will detach away from the battery. That is, the base plate 42 in the explosion-proof sheet 4 will flip relative to the connecting ring 41 through the connecting part 43, and the internal pressure of the battery will be quickly released. During the release process, the base plate 42 will not scatter but will remain beside the connecting ring 41 through the connecting part 43, facilitating recovery. If the product needs to be replaced with a new explosion-proof sheet 4 later, the steel-aluminum riveting of the steel cover 1 and the aluminum pressure ring 2 can be easily disassembled. Only a single cut with a milling cutter is needed to cut the folding plate 22 of the aluminum pressure ring 2, and the entire explosion-proof valve structure will detach directly. Therefore, this utility model has a simple structure, is easy to manufacture, is easy to implement, and has low cost. It mainly solves the problems of poor sealing, high replacement costs, and easy deformation caused by welding in the existing assembly structure of the steel cover 1 and the explosion-proof valve. The technical solution of this utility model effectively solves the drawbacks of welding by using riveting, preventing product deformation due to thermal expansion during manufacturing. Furthermore, if the explosion-proof sheet 4 is damaged and needs replacement, riveting facilitates disassembly and assembly, resulting in lower replacement costs. 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 groove depth of the clearance groove 24 between the folding plate 22 and the limiting plate 23. Therefore, the height of the sealing ring 3 is also higher than the height of the limiting plate 23. When the limiting plate 23 is pressed against the steel cover... When the lower end face is reached, the sealing ring 3 is deformed under pressure within the relief groove 24 until its height is flush with the height of the limiting plate 23. Thus, the amount of compression of the sealing ring 3 is controlled by the height of the limiting plate 23, ensuring that the sealing ring 3 is always in a reasonable deformation state. This prevents the sealing ring 3 from being deformed too much under pressure, which would affect its service life, and also prevents the sealing ring 3 from being deformed too little under pressure, which would result in insufficient sealing performance. Therefore, even if the combination is done by riveting, the sealing performance between the steel cover 1 and the pressure ring can be guaranteed, preventing battery leakage and improving safety.

[0066] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model 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 utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A battery cover explosion-proof valve assembly structure based on riveting process, which is installed on a steel cover plate of the battery cover 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 disc; wherein... An aluminum pressure ring includes a ring body and a folding plate and a limiting plate extending along the axial direction of the ring body; the folding plate and the limiting plate are spaced apart on their inner and outer circumferences, 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 sheet is attached and fixed to the bottom of the ring body and covers the through hole of the ring body; A sealing ring is disposed within the relief groove, and the height of the sealing ring is greater than the depth of the relief groove. The aluminum pressure ring is riveted to the steel cover plate. The folding plate is partially folded towards the outer periphery of the limiting plate until the folding plate presses against the upper end face of the steel cover plate, and the limiting plate is axially pressed against the lower end face of the steel cover plate, so that the height of the sealing ring after compression deformation is flush with the height of the limiting plate.

2. The battery cover explosion-proof valve assembly structure based on riveting process as described in claim 1, characterized in that: When the sealing ring is placed in the clearance groove, there is a clearance space between the sealing ring and the folding plate or the limiting plate, so that the sealing ring can expand and compress and deform circumferentially within the clearance space when subjected to force.

3. The battery cover explosion-proof valve assembly structure based on riveting process as described in claim 1, characterized in that: The bottom of the ring body is recessed to accommodate the explosion-proof plate, and the height of the explosion-proof plate is equal to the depth of the recessed platform. The explosion-proof plate is located inside 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.

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

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

6. The battery cover explosion-proof valve assembly structure based on riveting process as described 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 process as described in any one of claims 1 to 6, characterized in that: The explosion-proof sheet includes a connecting ring for welding to the ring body and a substrate connected inside 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. If the substrate is subjected to excessive pressure, it will expand and rupture relative to the connecting ring through the tear groove. The substrate can be flipped relative to the connecting ring at the connecting portion.

8. The battery cover explosion-proof valve assembly structure based on riveting process as described in claim 7, characterized in that: The substrate is recessed with a groove for communicating with the tear groove. The recessed groove includes an annular groove and a plurality of strip grooves. The annular groove is located at the center of the substrate, and the plurality of strip grooves are arranged at equal intervals around the outer periphery of the annular groove. The annular groove is connected to the tear groove through each of the strip grooves.

9. The battery cover explosion-proof valve assembly structure based on riveting process as described in claim 8, characterized in that: The depths of the annular groove and the strip groove are both less than the depth of the tear groove.

10. The battery cover explosion-proof valve assembly structure based on riveting process as described in claim 9, characterized in that: The annular groove has an annular region inside; a rectangular region is formed between each of the strip grooves, and each of the rectangular regions is equally spaced around the outer periphery of the annular groove.

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