Multistage shockproof explosion-proof valve

Abstract

The utility model provides a kind of multistage anti-seismic explosion-proof valve and manufacturing method.The multistage anti-seismic explosion-proof valve of the utility model includes the body of sheet shape, the body edge is explosion-proof valve ring, the middle part of the body is thinning area and the thickness size of thinning area is less than the thickness size of explosion-proof valve ring, the reinforcing rib with the strength of the place can be improved is had at thinning area, the score with annular recess is had on thinning area close to its edge, annular recess buffer groove is had between thinning area and explosion-proof valve ring and buffer groove position explosion-proof valve ring and score, the reinforcing rib includes reinforcing frame in the middle part of thinning area and reinforcing strip at the both ends of frame body.The multistage anti-seismic explosion-proof valve of the utility model can be stably welded and installed on battery cover plate.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically to a multi-stage shockproof and explosion-proof valve. Background Technology

[0002] To ensure the safety of power batteries, an explosion-proof valve is usually installed on the top cover of the power battery. When the battery is improperly charged, short-circuited, or abused, a large amount of gas will be generated inside the battery, and the temperature will rise sharply. At this time, the gas will force open the explosion-proof valve to release pressure, thereby ensuring the safety of the battery.

[0003] The simplest existing lithium-ion battery cover consists of a cover sheet, with plastic insulation between the positive and negative terminals and the cover sheet. A vent plate, appearing as a shallow indentation, is located in the center of the cover sheet. However, this vent plate is prone to damage and deformation during transportation and production. Furthermore, after welding, the vent plate shrinks due to temperature changes, further increasing the likelihood of breakage and cracking, rendering the entire cover plate a defective product.

[0004] To address the aforementioned problems, Chinese patent CN202222368276.8 discloses an explosion-proof valve and a battery. The explosion-proof valve includes a body and a heat-absorbing element, wherein the body has grooves; the heat-absorbing element is connected to the body and located between the edge of the body and the grooves, and is disposed around at least a portion of the grooves.

[0005] The explosion-proof valve in the aforementioned patent has a heat-absorbing component between the edge of the valve body and the groove. When it is welded to the top cover of the battery, the heat generated by the welding can be absorbed by the heat-absorbing component, avoiding any impact on the groove. This improves the consistency of the explosion-proof valve's burst pressure and ensures the safety performance of the battery.

[0006] It can be seen that the additional heat-absorbing fins not only lead to excessively high costs, but also make the explosion-proof valve's structure too complex due to the presence of multiple parts. Utility Model Content

[0007] The first objective of this invention is to address the aforementioned problems in existing technologies by providing a multi-stage shock-resistant explosion-proof valve that can prevent cracking of the explosion-proof valve due to shrinkage after welding without increasing costs.

[0008] To achieve the first objective mentioned above, this utility model can be implemented through the following technical solutions:

[0009] A multi-stage shock-resistant and explosion-proof valve includes a sheet-shaped body, characterized in that the edge of the body is an explosion-proof valve ring, the middle part of the body is a thinning zone with a thickness smaller than that of the explosion-proof valve ring, the thinning zone has a reinforcing rib to improve its strength, the thinning zone has an annular recessed groove near its edge, and an annular recessed buffer groove is provided between the thinning zone and the explosion-proof valve ring, with the buffer groove positioned between the explosion-proof valve ring and the groove;

[0010] The reinforcing ribs include a reinforcing frame located in the middle of the thinning zone and reinforcing strips located at both ends of the frame.

[0011] In the above-mentioned multi-stage anti-vibration and explosion-proof valve, the thickness dimension of the thinning zone is H1, and the thickness dimension of the thinning zone at the groove is H2, wherein H1 > H2.

[0012] In the aforementioned multi-stage anti-vibration and explosion-proof valve, the size range of H1 is 0.25-0.35mm.

[0013] In the aforementioned multi-stage anti-vibration and explosion-proof valve, the size range of H2 is 0.1-0.15mm.

[0014] In the aforementioned multi-stage anti-vibration and explosion-proof valve, a safety rib is provided at the groove, and the safety rib protrudes from the bottom of the groove.

[0015] In the aforementioned multi-stage anti-vibration and explosion-proof valve, there are several safety ribs, which are arranged adjacent to each other at intervals along the notch.

[0016] In the above-mentioned multi-stage anti-vibration and explosion-proof valve, the buffer groove includes a deformable bottom surface and supporting surfaces located on both sides of the deformable bottom surface. The thickness of the deformable bottom surface is H3, and the opposite side of the notch of the deformable bottom surface protrudes from the body, with the protrusion of the deformable bottom surface from the body being H4, wherein H4 > H3.

[0017] In the above-mentioned multi-stage anti-vibration and explosion-proof valve, the size range of H3 is 0.06-0.1mm, and the value range of H4 is 0.16-0.2mm.

[0018] In the above-mentioned multi-stage anti-vibration and explosion-proof valve, the interval between the groove and the buffer groove is L1, and the size range of L1 is 0.5-0.7mm.

[0019] In the aforementioned multi-stage anti-seismic explosion-proof valve, the included angle between the support surface and the deformable bottom surface is 90°-170°.

[0020] To achieve the second objective mentioned above, this utility model can be implemented through the following technical solutions:

[0021] A method for manufacturing a multi-stage shock-resistant and explosion-proof valve, characterized in that the method includes the following steps:

[0022] S1. Initial blank preparation: The metal raw materials are stamped to obtain a sheet-shaped explosion-proof valve initial blank;

[0023] The initial blank is cleaned with hydrocarbons to remove surface oil and dirt;

[0024] S2. Heat treatment: Anneal the cleaned blank at a temperature of 360℃-460℃ for 1 hour to relieve stress. After annealing, cool it by air cooling to obtain a semi-finished product.

[0025] S3, One-time stamping: The semi-finished product is placed into the corresponding stamping die, and a thinning zone and reinforcing ribs are processed in the middle of the semi-finished product;

[0026] S4. Secondary stamping: The semi-finished product after the first stamping is stamped again to form a buffer groove on the body;

[0027] S5. Third stamping: The semi-finished product after the second stamping is stamped again to form engravings and safety ribs on the body, resulting in the finished explosion-proof valve.

[0028] S6. Continuous pressure test: The finished explosion-proof valves are subjected to continuous pressure test with a burst pressure range of 1.7-2.1MPa. Explosion-proof valves that fail to meet the pressure value during the test are rejected.

[0029] In the above-mentioned method for manufacturing a multi-stage anti-vibration and explosion-proof valve, the continuous pressure test in step S6 is a segmented test, which is divided into three segments in this test;

[0030] S601, the first stage is set with an upward pressure of 0.3MPa and an upward time of 8 seconds;

[0031] S602, the second stage is set with an upward pressure of 0.8 MPa and an upward time of 15 seconds;

[0032] S603, the third stage is set with an upward pressure of 1.7999 MPa and an upward time of 23 seconds.

[0033] Compared to existing technologies, when this multi-stage anti-vibration and explosion-proof valve is welded onto the cover plate, the force generated by the weld's cooling and contraction will act on the explosion-proof valve. However, after the multi-stage anti-vibration and explosion-proof valve is welded to the cover plate, the distance between the buffer groove and the weld is the closest. Simultaneously, the buffer groove experiences the greatest deformation after processing, and its deformed bottom surface is not on the same plane as the thinned area. Therefore, when the weld cools and contracts, it will stretch the edge of the explosion-proof valve, causing the buffer groove to undergo tensile deformation under stress. After being welded to the cover plate, if subjected to vibration, the deformation of the buffer groove can absorb the vibration energy, preventing stress from acting on the weld and scoring, thus avoiding cracking.

[0034] As can be seen, this multi-stage anti-vibration and explosion-proof valve only requires the above-mentioned structure to be installed in the main body, thus avoiding the need for additional parts and effectively reducing its cost. Moreover, it effectively solves the drawbacks of welding during connection and use, resulting in high stability.

[0035] In this manufacturing method, the thinning zone, scoring, and buffer groove are formed as independent processes. Therefore, this process can form corresponding complex structures on the main body. Furthermore, during testing, because the explosion-proof valve is subjected to a set pressure environment within a set time, the stress conditions of the explosion-proof valve are realistically simulated, allowing for accurate detection of its opening behavior at various pressure stages. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the front of this multi-stage shock-resistant and explosion-proof valve.

[0037] Figure 2 This is a three-dimensional structural diagram of the back of this multi-stage shockproof and explosion-proof valve.

[0038] Figure 3 This is a cross-sectional structural diagram of the multi-stage anti-vibration and explosion-proof valve.

[0039] Figure 4 yes Figure 3 A schematic diagram of the partial structure at part A in the middle.

[0040] Figure 5 This is a three-dimensional structural diagram of a multi-stage shock-resistant and explosion-proof valve with another type of structure.

[0041] In the picture:

[0042] 1. Body; 2. Explosion-proof valve ring; 3. Thinning zone; 4. Score; 5. Reinforcing rib; 51. Reinforcing frame; 52. Reinforcing strip; 6. Safety rib; 7. Buffer groove; 71. Deformable bottom surface; 72. Support surface; 73. Transition section. Detailed Implementation

[0043] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0044] like Figure 1-5 As shown, this multi-stage anti-vibration and explosion-proof valve includes a sheet-shaped body 1, an explosion-proof valve ring 2 at the edge of the body 1, a thinning zone 3 in the middle of the body 1, and the thickness of the thinning zone 3 is smaller than the thickness of the explosion-proof valve ring 2. The thinning zone 3 has a reinforcing rib 5 that can improve the strength of the area. The thinning zone 3 has an annular recessed groove 4 near its edge. There is an annular recessed buffer groove 7 between the thinning zone 3 and the explosion-proof valve ring 2, and the buffer groove 7 is located between the explosion-proof valve ring 2 and the groove 4.

[0045] The reinforcing rib 5 includes a reinforcing frame 51 located in the middle of the thinning zone and reinforcing strips 52 located at both ends of the frame.

[0046] The reinforcing rib 5 can distribute the force in the thinning zone 3, preventing the central area of ​​the thinning zone 3 from bulging excessively after being stressed and touching the end face of the battery cover, thus affecting the normal valve opening.

[0047] The reinforcing rib 5 can also change the thickness of the body 1, change the resonance frequency of the body 1, reduce resonance, and prevent the explosion-proof valve from degrading or failing due to high-frequency resonance during use.

[0048] Of course, the buffer groove 7 can deform appropriately during the welding process between the body 1 and the end cover, thereby ensuring that the explosion-proof valve is stably connected to the battery end cover.

[0049] The reinforcing frame 51 and the reinforcing strip 52 are arranged laterally along the length of the thinning zone 3. This structure can effectively and appropriately improve the strength of the thinning zone 3.

[0050] In this embodiment, the reinforcing frame is circular. However, depending on the actual situation, a rectangular reinforcing frame is also feasible.

[0051] The thickness dimension of the thinning region 3 is H1, and the thickness dimension of the thinning region at the notch 4 is H2, wherein H1 > H2.

[0052] The size range of H1 is 0.25mm.

[0053] The size range of H2 is 0.1 mm.

[0054] Based on the actual situation, it is also feasible for H1 to be 0.35mm and H2 to be 0.15mm.

[0055] The settings of H1 and H2 ensure that the thinning zone breaks off from the score mark after reaching the preset pressure value. Since the thickness of the body 1 at score mark 4 is smaller than the thickness of other parts of the body 1, and score mark 4 is located at the thinning zone 3.

[0056] Therefore, when the thinning zone 3 is impacted by airflow and the pressure reaches the preset value, the thinning zone 3 will break off from the notch 4 and release the pressure.

[0057] A safety rib 6 is provided at the notch 4, and the safety rib 6 protrudes from the bottom of the notch 4.

[0058] The number of safety ribs 6 is several, and the safety ribs 6 are arranged adjacent to each other at intervals at the notch 4.

[0059] The safety rib 6 prevents the entire scratch from falling off the body 1 when it breaks. Since the safety rib 6 protrudes from the bottom of the scratch 4, it also effectively increases the thickness of the area, so that the scratch 4 will bend at the safety rib 6 after it breaks, thus achieving the purpose of directional valve opening.

[0060] The number of safety ribs 6 can be set according to the actual size of the explosion-proof valve. For example, if the explosion-proof valve is large and the safety rib 6 is designed as a single unit, it will increase the valve opening pressure, reduce the valve opening angle, and affect normal pressure relief.

[0061] If the size of the safety rib is reduced, the proportion of the safety rib 6 in the notch 4 will be too small, causing the safety rib 6 to break along with the notch 4. In this case, the number of safety ribs 6 can be set to multiple, and when the number of safety ribs 6 is more than one, the adjacent safety ribs 6 are spaced apart to ensure that the explosion-proof valve can open normally while avoiding splashing after the thinned zone 3 opens.

[0062] The buffer groove 7 includes a deformable bottom surface 71 and support surfaces 72 located on both sides of the deformable bottom surface 71. The thickness of the deformable bottom surface 71 is H3. The body 1 protrudes from the opposite side of the notch of the deformable bottom surface 71, and the protrusion of the deformable bottom surface 71 from the body is H4, where H4 > H3.

[0063] In this embodiment, the size of H3 is 0.06 mm, and the value of H4 ranges from 0.16 mm. However, depending on the actual situation, a size of 0.1 mm for H3 and 0.2 mm for H4 is also feasible.

[0064] The shape of the buffer groove 7 is the same as the outer contour of the explosion-proof valve ring 2. The buffer groove 7 is set to protrude from one end face of the body 1, so that when the explosion-proof valve ring 2 is subjected to tension or compression in any direction, it can be absorbed by the buffer groove 7, protecting the structure of the body 1 and the notch 4 from being affected.

[0065] The transition section 73 between the deformable bottom surface 71 and the supporting surface 72 is a smooth transition using a circular arc surface.

[0066] The deformable bottom surface 71 is a horizontal surface, and the thickness of the transition part 73 is smaller than the thickness of the support surface 72. This reduces stress concentration and guides deformation to occur at the transition part 73.

[0067] When the main body 1 is compressed, the transition portions 73 on both sides deform, causing the angle between the support surface 72 and the deformed bottom surface 71 to decrease, and the support surfaces 72 on both sides move closer together to absorb the compressive force. When stretched, the transition portions 73 on both sides deform, causing the angle between the support surface 72 and the deformed bottom surface 71 to increase, and the support surfaces 72 on both sides move further apart to absorb the tensile force.

[0068] Therefore, whether it is compression or stretching, it occurs at the transition portions 73 on both sides, without affecting the notch 4, thus ensuring the reliability of the notch 4. Furthermore, distributing the deformation to the transition portions 73 on both sides also avoids deformation concentrated in one area.

[0069] For example, during extrusion, if the deformation is concentrated in one area, the deformed area may become too high and press against the cover plate, resulting in incomplete stress release. This stress will then be transferred to the scoring area, affecting the performance of the scoring.

[0070] The distance between the notch 4 and the buffer groove 7 is L1, and the size of L1 is within the range of 0.5mm. Depending on the actual situation, a size of 0.6 or 0.7mm for L1 is also feasible.

[0071] The angle between the supporting surface 72 and the deformable bottom surface 71 is 90°. However, depending on the actual situation, an angle of 170° is also feasible.

[0072] This ensures that the groove 4 does not affect the buffer groove 7 when it breaks, and the breakage only occurs at the groove 4.

[0073] The manufacturing method of this multi-stage shock-resistant and explosion-proof valve includes the following steps:

[0074] S1. Initial blank preparation: The metal raw materials are stamped to obtain a sheet-shaped explosion-proof valve initial blank;

[0075] The initial blank is cleaned with hydrocarbons to remove surface oil and dirt;

[0076] S2. Heat treatment: Anneal the cleaned blank at a temperature of 360℃-460℃ for 1 hour to relieve stress. After annealing, cool it by air cooling to obtain a semi-finished product.

[0077] S3, One-time stamping: The semi-finished product is placed into the corresponding stamping die, and a thinning zone and reinforcing ribs are processed in the middle of the semi-finished product;

[0078] S4. Secondary stamping: The semi-finished product after the first stamping is stamped again to form a buffer groove on the body;

[0079] S5. Third stamping: The semi-finished product after the second stamping is stamped again to form engravings and safety ribs on the body, resulting in the finished explosion-proof valve.

[0080] S6. Continuous pressure test: The finished explosion-proof valves are subjected to continuous pressure test with a burst pressure range of 1.7-2.1MPa. Explosion-proof valves that fail to meet the pressure value during the test are rejected.

[0081] The continuous pressure test in step S6 is a segmented test, which is divided into three segments in this test;

[0082] S601, the first stage is set with an upward pressure of 0.3MPa and an upward time of 8 seconds;

[0083] S602, the second stage is set with an upward pressure of 0.8 MPa and an upward time of 15 seconds;

[0084] S603, the third stage is set with an upward pressure of 1.7999 MPa and an upward time of 23 seconds.

[0085] The burst pressure value of 2-2.4 MPa is the critical value; within this range, the explosion-proof valve will be triggered to open. Therefore, its maximum safe pressure during continuous pressure testing is 1.7999 MPa.

[0086] The three-stage testing method accurately assesses battery performance under multiple pressure conditions. Furthermore, it simulates the actual bulging of a battery. This is because the explosion-proof valve only opens after being continuously subjected to a set pressure, and the three testing stages precisely reflect this process.

[0087] After this multi-stage anti-vibration and explosion-proof valve is welded onto the cover plate, the force generated by the weld's cooling and contraction will act on the valve. However, after the valve is welded to the cover plate, the distance between the buffer groove and the weld is closest. Simultaneously, the buffer groove experiences the greatest deformation after processing, and its deformed bottom surface is not on the same plane as the thinned area. Therefore, the weld's cooling and contraction will stretch the edge of the explosion-proof valve, causing the buffer groove to undergo tensile deformation under stress. After being welded to the cover plate, if subjected to vibration, the deformation of the buffer groove can absorb the vibration energy, preventing stress from acting on the weld and scoring, thus avoiding cracking.

[0088] As can be seen, this multi-stage anti-vibration and explosion-proof valve only requires the above-mentioned structure to be installed in the main body, thus avoiding the need for additional parts and effectively reducing its cost. Moreover, it effectively solves the drawbacks of welding during connection and use, resulting in high stability.

[0089] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0090] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A multi-stage shock-resistant and explosion-proof valve, comprising a sheet-like body, characterized in that, The edge of the body is an explosion-proof valve ring, the middle part of the body is a thinning area and the thickness of the thinning area is smaller than the thickness of the explosion-proof valve ring. The thinning area has a reinforcing rib that can improve the strength there. The thinning area has an annular recessed groove near its edge. There is an annular recessed buffer groove between the thinning area and the explosion-proof valve ring and the groove. The reinforcing ribs include a reinforcing frame located in the middle of the thinning zone and reinforcing strips located at both ends of the frame.

2. The multi-stage anti-vibration and explosion-proof valve according to claim 1, characterized in that, The thickness dimension of the thinning area is H1, and the thickness dimension of the thinning area at the scribe is H2, wherein H1 > H2.

3. The multi-stage anti-vibration and explosion-proof valve according to claim 2, characterized in that, The size range of H1 is 0.25-0.35mm.

4. The multi-stage anti-vibration and explosion-proof valve according to claim 2, characterized in that, The size range of H2 is 0.1-0.15mm.

5. The multi-stage anti-vibration and explosion-proof valve according to claim 1, characterized in that, The notch has a safety rib that protrudes from the bottom of the notch.

6. The multi-stage anti-vibration and explosion-proof valve according to claim 5, characterized in that, The number of safety ribs is several, and the safety ribs are arranged adjacent to each other at intervals at the notch.

7. The multi-stage anti-vibration and explosion-proof valve according to claim 1, characterized in that, The buffer groove includes a deformable bottom surface and supporting surfaces located on both sides of the deformable bottom surface. The thickness of the deformable bottom surface is H3, and the opposite side of the notch of the deformable bottom surface protrudes from the body with a dimension of H4, wherein H4 > H3.

8. The multi-stage anti-vibration and explosion-proof valve according to claim 7, characterized in that, The size range of H3 is 0.06-0.1mm, and the value range of H4 is 0.16-0.2mm.

9. The multi-stage anti-vibration and explosion-proof valve according to claim 8, characterized in that, The distance between the groove and the buffer groove is L1, and the size of L1 ranges from 0.5 to 0.7 mm.

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