Battery explosion-proof valve and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery explosion-proof valve and a battery, the battery explosion-proof valve comprises a sheet body which is thinned along the thickness direction of the sheet body to form nicks, and the nicks enclose to form an opening area; the reinforcing rib is connected with the sheet body and is arranged in the opening area; wherein the ratio of the length to the width of the opening area is A, the area of the opening area is S, the area occupied by the reinforcing ribs is S1, and A is larger than 1, and A * S / S1 is larger than or equal to 1.4 and smaller than or equal to 475. According to the anti-explosion valve, the reinforcing ribs are arranged in the opening area, the structural strength of the sheet body in the opening area is improved, the anti-explosion valve is prevented from being damaged easily, accidental opening of the opening area is also avoided, and therefore the pressure relief effect of the anti-explosion valve is guaranteed. Furthermore, the relation among the ratio A of the length to the width of the opening area, the area S of the opening area and the area S1 occupied by the reinforcing ribs is limited, the structural strength and the pressure relief effect of the opening area are guaranteed, meanwhile, machining and manufacturing of the anti-explosion valve are facilitated, and the machining efficiency of the anti-explosion valve is guaranteed.

Description

Technical Field

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

[0002] As lithium batteries are increasingly used in power and energy storage, their safety has become a major concern. In lithium-ion batteries, thin-plate metal explosion-proof valves are typically connected to the edge of the explosion-proof vent. When the internal pressure of the battery exceeds or equals the valve's set burst value, the valve partially ruptures, allowing for rapid release of internal gas and quickly reducing the internal pressure to prevent explosion. However, the thin-plate structure of the explosion-proof valve results in relatively poor structural strength, affecting its installation efficiency and impacting its pressure relief effect after installation behind the battery. Utility Model Content

[0003] In view of this, the present invention provides a battery explosion-proof valve and a battery to solve the problem that the structural strength of the explosion-proof valve in the prior art is poor, which affects the installation efficiency and pressure relief effect of the explosion-proof valve.

[0004] In a first aspect, this utility model provides a battery explosion-proof valve, comprising: a sheet body, which is thinned along the thickness direction to form a groove, the groove enclosing an opening area; and a reinforcing rib, which is connected to the sheet body and disposed within the opening area; wherein the ratio of the length to the width of the opening area is A, the area of ​​the opening area is S, and the area occupied by the reinforcing rib is S1, satisfying A > 1, 1.4 ≤ A × S / S1 ≤ 475.

[0005] Beneficial effects: By forming grooves on the sheet, when the internal pressure of the battery reaches the predetermined burst pressure, the residual thickness at the grooves is broken through, thereby opening the opening area and allowing the battery's interior to communicate with the outside for pressure relief, preventing battery explosion. Furthermore, by adding reinforcing ribs to the opening area, the structural strength of the sheet in the opening area is improved, preventing damage to the explosion-proof valve during assembly due to low structural strength, thus improving the installation efficiency of the explosion-proof valve. It also prevents accidental opening due to insufficient structural strength of the opening area when the battery is subjected to compression or impact, thereby ensuring the pressure relief effect of the explosion-proof valve. Furthermore, by limiting the relationship between the length-to-width ratio A of the opening area, the area S of the opening area, and the area S1 occupied by the reinforcing ribs, the structural strength and pressure relief effect of the opening area are guaranteed while facilitating the manufacturing of the explosion-proof valve, ensuring its processing efficiency. Specifically, if A×S / S1 > 475, the reinforcing ribs will not adequately enhance the structural strength of the opening area, resulting in a weak structural strength. This leads to uneven stress distribution and severe stress concentration on the explosion-proof valve, making it prone to bursting at locations with high stress. Consequently, the burst pressure of the explosion-proof valve is unstable, affecting the battery's pressure relief performance. Therefore, issues remain regarding the assembly efficiency and pressure relief effect of the explosion-proof valve. If A×S / S1 < 1.4, the structural strength of the opening area will be too high, leading to excessive burst pressure of the explosion-proof valve. This results in severe gas impact and rapid heat spread during battery explosion, posing a significant safety risk. Furthermore, the manufacturing process of the explosion-proof valve becomes overly complex, affecting processing efficiency and increasing production costs.

[0006] Secondly, this utility model also provides a battery, including the aforementioned battery explosion-proof valve. The battery further includes a housing and a cover plate. At least one end of the housing is open. The cover plate is connected to the housing and seals the opening. The housing and the cover plate enclose a receiving space. The battery explosion-proof valve is disposed on the housing and / or the cover plate. The battery further includes a battery cell, which is disposed within the receiving space. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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 from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the overall structure of a battery explosion-proof valve according to an embodiment of the present utility model;

[0009] Figure 2 for Figure 1A top view of the battery explosion-proof valve shown;

[0010] Figure 3 This is a schematic diagram of the structure of the sheet body with notches and connecting sections (reinforcing ribs not shown) according to an embodiment of the present invention;

[0011] Figure 4 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0012] Figure 5 This is a schematic diagram of the area S of the opening zone of the battery explosion-proof valve in an embodiment of the present invention;

[0013] Figure 6 This is a schematic diagram of the area S1 occupied by the reinforcing rib of the battery explosion-proof valve in an embodiment of this utility model.

[0014] Explanation of reference numerals in the attached figures:

[0015] 1. Sheet body; 11. Score; 111. Straight section; 112. Curved section; 12. Opening area; 13. Connecting section; 2. Reinforcing rib; 21. First reinforcing rib; 22. Second reinforcing rib; 23. Third reinforcing rib; 231. First rib; 232. Second rib; 3. Shell; 4. Cover plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0017] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0018] According to an embodiment of the present invention, a battery explosion-proof valve is provided, comprising: a sheet 1, which is thinned along the thickness direction to form a notch 11, the notch 11 enclosing an opening area 12; and a reinforcing rib 2, which is connected to the sheet 1 and disposed within the opening area 12; wherein the ratio of the length to the width of the opening area 12 is A, the area of ​​the opening area 12 is S, and the area occupied by the reinforcing rib 2 is S1, satisfying A > 1, 1.4 ≤ A × S / S1 ≤ 475.

[0019] The battery explosion-proof valve of this embodiment uses a notch 11 formed on the plate 1. When the internal pressure of the battery reaches a predetermined burst pressure, the residual thickness at the notch 11 is broken through, thereby opening the opening area 12 to allow the battery to communicate with the outside world for pressure relief and prevent battery explosion. Furthermore, by providing a reinforcing rib 2 in the opening area 12, the structural strength of the plate 1 in the opening area 12 is improved, preventing damage to the explosion-proof valve during assembly due to low structural strength. This improves the installation efficiency of the explosion-proof valve and also prevents accidental opening of the opening area 12 due to insufficient structural strength when the battery is subjected to compression or impact, thus ensuring the pressure relief effect of the explosion-proof valve. Further, by limiting the relationship between the length-to-width ratio A of the opening area 12, the area S of the opening area 12, and the area S1 occupied by the reinforcing rib 2, the structural strength and pressure relief effect of the opening area 12 are ensured while facilitating the manufacturing of the explosion-proof valve and ensuring its processing efficiency.

[0020] Specifically, if A×S / S1 > 475, the reinforcing effect of the reinforcing rib 2 on the structural strength of the opening area 12 is insufficient, the structural strength of the opening area 12 remains weak, the stress on the explosion-proof valve is uneven, and the stress concentration is severe, making the location of the explosion-proof valve with high stress prone to bursting, that is, the burst pressure of the explosion-proof valve is unstable, affecting the pressure relief performance of the battery. Therefore, there are still problems affecting the assembly efficiency and pressure relief effect of the explosion-proof valve. If A×S / S1 < 1.4, the structural strength of the opening area 12 will be too high, which will lead to the excessive burst pressure of the explosion-proof valve. This will result in severe gas impact and rapid heat spread during battery explosion, posing a high safety risk. Furthermore, the manufacturing process of the explosion-proof valve is too complex, affecting the processing efficiency of the explosion-proof valve and increasing production costs.

[0021] It is worth noting that if the structural strength of the opening area 12 is too low, it will not only easily cause the explosion-proof valve to be damaged at the opening area 12 during the battery manufacturing process, resulting in material waste and reduced assembly efficiency, but also make it easy for the opening area 12 to open unexpectedly during battery use, thus increasing the battery usage cost.

[0022] It should be noted that the accidental opening of the opening area 12 is relative to its normal opening. Normal opening of the opening area 12 refers to a situation where, due to thermal runaway or other problems, excessive gas is generated inside the battery, increasing the internal pressure. This internal pressure exerts pressure on the explosion-proof valve. When the internal pressure reaches the predetermined burst pressure, the relatively thin residual thickness of the notch 11 is breached, causing the opening area 12 to open. This allows the gas inside the battery to escape to the outside, achieving internal pressure relief and preventing battery explosions. Conversely, accidental opening of the opening area 12 occurs when the internal pressure remains within the normal range (i.e., less than the predetermined burst pressure). In this case, the internal pressure will not breach the residual thickness of the notch 11, meaning the opening area 12 should not normally open. However, if the structural strength of the opening area 12 is too low, when the battery is subjected to other external forces (such as compression or impact), the opening area 12 is prone to cracking or deformation, leading to damage and opening.

[0023] It should be noted that the notch 11 can be continuously set along the circumferential direction (e.g., Figure 2 As shown), it can also be set for non-contiguous (such as...). Figure 3 As shown), specifically, it can be set according to different battery usage requirements. The area enclosed by the scribing marks 11 is the area formed by the circumferential lines of the scribing marks 11.

[0024] Optionally, A×S / S1 can be any value from 1.4, 1.5, 1.6, 5, 5.3, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 475, or a value between any two values.

[0025] Optionally, the value of A can be any one of the following: 1.1, 1.3, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 13, 14, 15, or a value between any two values.

[0026] In one embodiment, such as Figure 2As shown, the length of the opening area 12 is L, and the width of the opening area 12 is W, satisfying A=L / W, 20mm≤L≤90mm, and 8mm≤W≤35mm. This setting ensures the pressure relief efficiency of the explosion-proof valve, facilitates the layout of various components on the battery cover 4, and avoids affecting the welding between the explosion-proof valve and the battery cover 4.

[0027] It should be noted that if the values ​​of L and W are too small, the area of ​​the opening area 12 will be too small. When the opening area 12 is opened, the venting area available for battery venting will be too small, affecting the battery's pressure relief efficiency. This means that the internal pressure of the battery may not be able to be released in time, which may lead to increased thermal runaway and battery explosion. If the values ​​of L and W are too large, the area of ​​the opening area 12 will be too large, which will also lead to an excessively large overall area of ​​the sheet 1. This will result in the explosion-proof valve occupying too much area on the battery cover 4, affecting the layout of other components on the battery cover 4 (such as terminals, injection holes, etc.). Alternatively, if the overall area of ​​the sheet 1 remains unchanged, but the area of ​​the opening area 12 is too large, the groove 11 will be too close to the edge of the sheet 1, making it difficult to process and shape the groove 11. At the same time, the edge of the explosion-proof valve is usually welded to the battery cover 4, which will affect the welding quality between the explosion-proof valve and the battery cover 4.

[0028] Optionally, L can be any value from 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, 35mm, 38mm, 40mm, 42mm, 45mm, 48mm, 50mm, 52mm, 55mm, 58mm, 60mm, 62mm, 65mm, 68mm, 70mm, 72mm, 75mm, 78mm, 80mm, 82mm, 85mm, 88mm, 90mm, or a value between any two of these values.

[0029] Optionally, W can be any value among 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 32mm, and 35mm, or a value between any two of these values.

[0030] It is worth noting that in related technologies, such as Figures 1 to 3 As shown, the outer contour of the sheet 1 is typically an oblong shape (also commonly referred to as a racetrack shape), therefore, the contour shape formed by the enclosed area of ​​the notches 11 is also typically an oblong shape. Specifically, in this embodiment, as... Figure 2 As shown, the scribing 11 includes two straight segments 111 and two curved segments 112. The two straight segments 111 are spaced apart relative to each other along the width direction, and the two curved segments 112 connect the two ends of the two straight segments 111 on the same side, so that the scribing 11 encloses and forms an elongated oval opening area 12.

[0031] It should be further explained that the length L of the opening area 12 is the maximum dimension of the opening area 12 along the length direction, and the width W of the opening area 12 is the maximum dimension of the opening area 12 along the width direction. In this embodiment, as... Figure 2 As shown, the length of the open area 12 is the farthest distance L between the two arc segments 112 along the length direction, and the width of the open area 12 is the distance W between the two straight segments 111 along the width direction. Therefore, the ratio of the length to the width of the open area 12 (i.e., the length-to-width ratio) A = L / W, and the area of ​​the open area 12 is S = (LW) × W + π × (W / 2)2.

[0032] Of course, in other alternative embodiments, the outline shape formed by the enclosed area of ​​the notch 11 can also be other regular or irregular shapes, such as circles, ellipses, polygons, etc. In this case, the length, width and area of ​​the opening area 12 can be calculated according to the actual shape of the opening area 12.

[0033] It is worth noting that the reinforcing rib 2 is usually a strip structure (straight or curved), which can be a continuous single strip or multiple strips spaced apart. Therefore, the area S1 occupied by the reinforcing rib 2 is calculated as the product of the total length of the strip-shaped reinforcing rib 2 and the width of the strip-shaped reinforcing rib 2.

[0034] In one embodiment, the area S of the opening region 12 and the area S1 occupied by the reinforcing rib 2 satisfy 1.05≤S / S1≤60. This configuration ensures the structural strength of the opening region 12 and the assembly effect between the explosion-proof valve and the battery cover 4, while also guaranteeing the pressure relief effect of the explosion-proof valve and facilitating its manufacturing process, thus ensuring efficient processing.

[0035] It is worth noting that if S / S1 > 60, when the value of S is constant, the value of S1 is too small, that is, the reinforcing rib 2 is set too few times, resulting in insufficient reinforcement effect of the reinforcing rib 2 on the structural strength of the opening area 12. The structural strength of the opening area 12 is still relatively weak. Therefore, there is still a problem affecting the assembly efficiency and pressure relief effect of the explosion-proof valve. When the value of S1 is constant, the value of S is too large, that is, the area of ​​the opening area 12 is too large. This will also cause the overall area of ​​the plate 1 to be too large, resulting in the explosion-proof valve occupying too much area on the battery cover plate 4, affecting the layout of other components on the battery cover plate 4 (such as terminals, injection holes, etc.). Alternatively, if the overall area of ​​the plate 1 remains unchanged, but the area of ​​the opening area 12 is too large, the groove 11 will be too close to the edge of the plate 1, making it difficult to process and form the groove 11. At the same time, the edge of the explosion-proof valve is usually welded to the battery cover plate 4, which will affect the welding quality between the explosion-proof valve and the battery cover plate 4. If S / S1 < 1.05, when the value of S is constant, the value of S1 is too large, meaning there are too many reinforcing ribs 2, resulting in excessive structural strength of the opening area 12. This leads to excessive burst pressure of the explosion-proof valve, causing severe gas impact and rapid heat spread during battery explosion, resulting in a high safety risk. Furthermore, the manufacturing process of the explosion-proof valve becomes too complex, affecting processing efficiency and increasing production costs. When the value of S1 is constant, the value of S is too small, resulting in an insufficient area for battery venting after the opening area 12 is opened. This affects the battery's pressure relief efficiency, meaning the internal pressure of the battery may not be released in time, leading to increased thermal runaway and potential battery explosion.

[0036] Optionally, S / S1 can be any value from 1.05, 2, 5, 8, 10, 12, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, or a value between any two values.

[0037] In one embodiment, such as Figure 5 As shown, the area S of the open region 12 satisfies 80mm. 2 ≤S≤1400mm 2 This design ensures the pressure relief efficiency of the explosion-proof valve, facilitates the layout of various components on the battery cover 4, and avoids affecting the welding between the explosion-proof valve and the battery cover 4.

[0038] It should be noted that if the value of S is too small, that is, if the area of ​​the opening area 12 is too small, the venting area available for battery venting after the opening area 12 is opened will be too small, affecting the battery's pressure relief efficiency. This means that the internal pressure of the battery may not be released in time, which may lead to increased thermal runaway and battery explosion. If the value of S is too large, that is, if the area of ​​the opening area 12 is too large, it will also cause the overall area of ​​the sheet 1 to be too large, resulting in the explosion-proof valve occupying too large an area on the battery cover 4. This will affect the layout of other components on the battery cover 4 (such as terminals, injection holes, etc.). Alternatively, if the overall area of ​​the sheet 1 remains unchanged, but the area of ​​the opening area 12 is too large, the groove 11 will be too close to the edge of the sheet 1, making it difficult to process and shape the groove 11. At the same time, the edge of the explosion-proof valve is usually welded to the battery cover 4, which will affect the welding quality between the explosion-proof valve and the battery cover 4.

[0039] Optionally, the value of S is 80mm. 2 100mm 2 150mm 2 200mm 2 250mm 2 300mm 2 350mm 2 400mm 2 450mm 2 500mm 2 550mm 2 600mm 2 650mm 2 700mm 2 750mm 2 800mm 2 850mm 2 900mm 2 950mm 2 1000mm 2 1050mm 2 1100mm 2 1150mm 2 1200mm 2 1250mm 2 1300mm 2 1350mm 2 1400mm 2 It can be any value in the range or the value between any two values.

[0040] In one embodiment, such as Figure 6 As shown, the area S1 occupied by the reinforcing rib 2 satisfies 20mm. 2 ≤S1≤700mm 2This design ensures the structural strength of the opening area 12 and the assembly effect between the explosion-proof valve and the battery cover 4, while also guaranteeing the pressure relief effect of the explosion-proof valve and facilitating its manufacturing process, thus ensuring efficient processing.

[0041] It is worth noting that if the value of S1 is too small, that is, if there are too few reinforcing ribs 2, the reinforcing effect of the reinforcing ribs 2 on the structural strength of the opening area 12 will be insufficient, and the structural strength of the opening area 12 will still be relatively weak. Therefore, there will still be problems affecting the assembly efficiency and pressure relief effect of the explosion-proof valve. If the value of S1 is too large, that is, if there are too many reinforcing ribs 2, the structural strength of the opening area 12 will be too high, resulting in excessive burst pressure of the explosion-proof valve. This will lead to severe gas impact and rapid heat spread during battery explosion, resulting in a high safety risk. Furthermore, the manufacturing process of the explosion-proof valve will be too complex, affecting the processing efficiency of the explosion-proof valve and increasing production costs.

[0042] Optionally, S1 can be set to 20mm. 2 50mm 2 100mm 2 150mm 2 200mm 2 250mm 2 300mm 2 350mm 2 400mm 2 450mm 2 500mm 2 550mm 2 600mm 2 650mm 2 700mm 2 It can be any value in the range or the value between any two values.

[0043] In one embodiment, the ratio A of the length to the width of the opening area 12 satisfies 1.3 ≤ A ≤ 8. This setting ensures both the pressure relief effect of the explosion-proof valve and the uniformity of force distribution on the valve, thereby improving the pressure relief performance of the battery.

[0044] It is worth noting that if A > 8, meaning the aspect ratio of the opening area 12 is too large, it will lead to uneven stress distribution and severe stress concentration in the opening area 12. This will make the explosion-proof valve prone to bursting at the location with higher stress, resulting in unstable burst pressure and affecting the battery's pressure relief performance. If A < 1.3, meaning the aspect ratio of the opening area 12 is too small, the area of ​​the opening area 12 will be too small due to the limited area of ​​the explosion-proof valve mounting surface (on the housing 3 or cover plate 4). This will result in too low burst pressure of the explosion-proof valve, causing it to burst when the battery is generating gas normally, affecting the battery's pressure relief effect and leading to battery failure.

[0045] Optionally, A can take any value from 1.3, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.8, 6, 6.2, 6.5, 6.8, 7, 7.2, 7.5, 7.8, 8, or a value between any two values.

[0046] In one embodiment, the length-to-width ratio A of the opening area 12, the area S of the opening area 12, and the area S1 occupied by the reinforcing rib 2 satisfy 5≤A≤8 and 5.3≤A×S / S1≤475. It should be noted that a larger length-to-width ratio of the opening area 12 makes it more prone to deformation, thus increasing the structural strength requirements. Furthermore, a larger length-to-width ratio results in a long and slender structure, leading to a long and slender vent formed when the opening area 12 is open. Since long and slender vents have relatively poor venting performance, the vent area needs to be further increased. Therefore, in this embodiment, by further limiting the range of A×S / S1, the structural strength of the opening area 12 and the pressure relief effect of the explosion-proof valve can be further guaranteed.

[0047] In one embodiment, such as Figure 2 As shown, at least two reinforcing ribs 2 are provided along the length of the opening area 12. This arrangement can improve the reinforcing effect of the reinforcing ribs 2 on the strength of the opening area 12.

[0048] Specifically, in one embodiment, such as Figure 2 As shown, multiple reinforcing ribs 2 are provided, including a first reinforcing rib 21, a second reinforcing rib 22, and a third reinforcing rib 23. Along the length of the opening area 12, the first reinforcing rib 21 is positioned at the first end of the opening area 12, the second reinforcing rib 22 is positioned at the second end of the opening area 12, and the third reinforcing rib 23 is positioned between the first reinforcing rib 21 and the second reinforcing rib 22. Therefore, by providing the first reinforcing rib 21, the second reinforcing rib 22, and the third reinforcing rib 23, and arranging them along the length of the opening area 12, the strengthening effect of the reinforcing ribs 2 on the opening area 12 is improved, and the strength of the opening area 12 is made more uniform, avoiding stress concentration and further ensuring the overall structural strength of the opening area 12.

[0049] Furthermore, the ratio A of the length to the width of the opening area 12, the area S of the opening area 12, and the area S1 occupied by the reinforcing rib 2 satisfy 1.5 ≤ A × S / S1 ≤ 475. The arrangement of the first reinforcing rib 21, the second reinforcing rib 22, and the third reinforcing rib 23 further ensures the overall structural strength of the opening area 12. Therefore, the value of A × S / S1 can be further limited, ensuring that the opening area 12 has sufficient structural strength to prevent damage to the explosion-proof valve during assembly due to low structural strength, thereby improving the installation efficiency of the explosion-proof valve. It also prevents accidental opening of the battery due to insufficient structural strength of the opening area 12 when subjected to compression or collision, thus ensuring the pressure relief effect of the explosion-proof valve. It also simplifies the manufacturing process of the explosion-proof valve and ensures its processing efficiency.

[0050] It is worth noting that, please refer to Figure 2 The first end and the second end of the opening area 12 are the two opposite ends of the opening area 12 along its length. Therefore, the first reinforcing rib 21 and the second reinforcing rib 22 are respectively disposed at the two opposite ends of the opening area 12 along its length, and the third reinforcing rib 23 is disposed in the area between the two opposite ends of the opening area 12 along its length. Furthermore, there may be one third reinforcing rib 23, or several may be disposed at intervals along its length.

[0051] In one embodiment, such as Figure 2 As shown, both the first reinforcing rib 21 and the second reinforcing rib 22 are arc-shaped structures, with the arc-shaped openings of the first reinforcing rib 21 and the second reinforcing rib 22 positioned opposite each other. As can be seen from the above, the notch 11 encloses and forms an elongated oval opening area 12, meaning that the two ends of the opening area 12 along its length are arc-shaped. Therefore, in this embodiment, the first reinforcing rib 21 and the second reinforcing rib 22, positioned at the two ends of the opening area 12 along its length, are both arc-shaped structures to match the contour of the opening area 12. This allows for the placement of reinforcing ribs 2 at the edges of the opening area 12 along its length, thereby improving the structural strength of the edges of the opening area 12.

[0052] It is worth noting that, please refer to Figure 2 The arc-shaped structure has two ends that are spaced apart from each other, with an arc-shaped opening between the two ends. Therefore, the arc-shaped opening of the first reinforcing rib 21 is positioned towards the second end of the opening area 12, and the arc-shaped opening of the second reinforcing rib 22 is positioned towards the first end of the opening area 12.

[0053] In one embodiment, such as Figure 2As shown, the third reinforcing rib 23 includes a first rib 231 and a second rib 232. The first rib 231 extends along the length direction of the opening area 12, and the second rib 232 extends along the width direction of the opening area 12. There is at least one of the first rib 231 and the second rib 232, and the first rib 231 and the second rib 232 are connected. With this setting, ribs are provided along both the length direction and the width direction of the opening area 12. Therefore, the structural strength of the opening area 12 can be enhanced in different directions of the opening area 12, and the setting length of the reinforcing rib 2 can be increased within a certain area range, thereby further ensuring the structural strength of the opening area 12.

[0054] It should be noted that the third reinforcing rib 23 can be arranged in an "I" shape or a "king" shape; optionally, the third reinforcing rib 23 can also be arranged in a "T" shape, or a "cross" shape, or a "dry" shape, or a "square" shape, or a "field" shape.

[0055] In one embodiment, as Figure 2 shown, along the length direction of the opening area 12, the minimum distance between two adjacent reinforcing ribs 2 is a, and 4 mm ≤ a ≤ 30 mm. With this setting, while ensuring the uniformity of the structural strength of the opening area 12, it is convenient for the processing and forming of the explosion-proof valve and avoids affecting the improvement effect of the structural strength of the opening area 12.

[0056] It should be noted that if a > 30 mm, the distance between two adjacent reinforcing ribs 2 is too large, resulting in insufficient structural strength in the area between two adjacent reinforcing ribs 2 of the opening area 12, and the uniformity of the overall structural strength of the opening area 12 is poor; if a < 4 mm, the arrangement of the reinforcing ribs 2 is too dense, which is not convenient for the processing and manufacturing of the explosion-proof valve, affects the processing efficiency of the explosion-proof valve, and is not conducive to the improvement of the structural strength of the opening area 12.

[0057] It should be noted that, as Figure 2 shown, the distance between two adjacent reinforcing ribs 2 refers to the distance between the first reinforcing rib 21 and the adjacent third reinforcing rib 23, the distance between the second reinforcing rib 22 and the adjacent third reinforcing rib 23, and the distance between two adjacent third reinforcing ribs 23.

[0058] Optionally, the value of a is any value among 4 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm or a value between any two of them.

[0059] Furthermore, the ratio A of the length to the width of the opening area 12, the area S of the opening area 12, and the area S1 occupied by the reinforcing rib 2 satisfy 1.6 ≤ A × S / S1 ≤ 475. By limiting the distance between adjacent reinforcing ribs 2, the uniformity of the structural strength of the opening area 12 can be further improved. Therefore, the value of A × S / S1 can be further limited, which can ensure that the opening area 12 has sufficient structural strength to avoid damage to the explosion-proof valve during assembly due to low structural strength, thereby improving the installation efficiency of the explosion-proof valve. It can also prevent accidental opening of the battery due to insufficient structural strength of the opening area 12 when it is squeezed or collided, thus ensuring the pressure relief effect of the explosion-proof valve. It can also simplify the manufacturing process of the explosion-proof valve and ensure the processing efficiency of the explosion-proof valve.

[0060] In one embodiment, such as Figure 2 As shown, along the length of the opening area 12, the minimum distance between the notch 11 and the reinforcing rib 2 is b, which satisfies 2mm≤b≤30mm. This design ensures the overall structural strength of the opening area 12 while facilitating the processing and forming of the explosion-proof valve, thus guaranteeing processing efficiency.

[0061] It is worth noting that if b > 30 mm, the distance between the reinforcing rib 2 and the notch 11 is too far, resulting in insufficient structural strength of the opening area 12 in the region between the reinforcing rib 2 and the notch 11. The structural strength of the edge of the opening area 12 is not easily guaranteed, affecting the uniformity of the structural strength of the opening area 12. If b < 2 mm, the distance between the reinforcing rib 2 and the notch 11 is too close, making the processing technology more difficult and affecting the processing quality and efficiency of the explosion-proof valve.

[0062] It should be noted that in this embodiment, please refer to... Figure 2 Along the length of the opening area 12, the distance between the notch 11 and the reinforcing rib 2 is the same as the distance between the notch 11 and the first reinforcing rib 21.

[0063] Optionally, the value of b can be any value among 2mm, 4mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm, and 30mm, or a value between any two of these values.

[0064] In one embodiment, such as Figure 3 As shown, the notch 11 extends circumferentially on the sheet 1. Along the extension direction of the notch 11, the notch 11 is discontinuous, and a connecting section 13 is formed at the discontinuity. That is, the notch 11 is not set around the entire circumference, but is partially discontinuous. The notch 11 is not set at the discontinuity, so as to connect the opening area 12 with the explosion-proof valve area outside the opening area 12. When the opening area 12 is opened, it can play a connecting role and prevent the opening area 12 from flying out.

[0065] According to an embodiment of the present invention, another aspect provides a battery including the aforementioned battery explosion-proof valve.

[0066] In one embodiment, such as Figure 4 As shown, the battery also includes a housing 3 and a cover plate 4. At least one end of the housing 3 is open, and the cover plate 4 is connected to the housing 3 and seals the opening. The housing 3 and the cover plate 4 together form an accommodating space. Furthermore, the battery explosion-proof valve can be disposed on the cover plate 4 or on the housing 3.

[0067] In one embodiment, the battery further includes a cell disposed within a housing space.

[0068] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery explosion-proof valve, characterized in that, include: A sheet (1) is thinned along the thickness direction to form a groove (11), and the groove (11) encloses an opening area (12); A reinforcing rib (2) is connected to the sheet body (1) and disposed within the opening area (12); The ratio of the length to the width of the opening area (12) is A, the area of ​​the opening area (12) is S, and the area occupied by the reinforcing rib (2) is S1, satisfying A>1, 1.4≤A×S / S1≤475.

2. The battery explosion-proof valve according to claim 1, characterized in that, The area S of the opening area (12) and the area S1 occupied by the reinforcing rib (2) satisfy 1.05≤S / S1≤60.

3. The battery explosion-proof valve according to claim 1, characterized in that, The area S of the opening region (12) satisfies 80 mm. 2 ≤S≤1400mm 2 .

4. The battery explosion-proof valve according to claim 1, characterized in that, The area S1 occupied by the reinforcing rib (2) is 20mm. 2 ≤S1≤700mm 2 .

5. The battery explosion-proof valve according to claim 1, characterized in that, The ratio A of the length to the width of the open area (12) satisfies 1.3≤A≤8.

6. The battery explosion-proof valve according to claim 1, characterized in that, The length of the opening area (12) is L, and the width of the opening area (12) is W, satisfying A=L / W, 20mm≤L≤90mm, 8mm≤W≤35mm.

7. The battery explosion-proof valve according to claim 1, characterized in that, The ratio A of the length to the width of the opening area (12), the area S of the opening area (12), and the area S1 occupied by the reinforcing rib (2) satisfy 5≤A≤8 and 5.3≤A×S / S1≤475.

8. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that, Along the length of the opening area (12), at least two reinforcing ribs (2) are provided.

9. The battery explosion-proof valve according to claim 8, characterized in that, The reinforcing ribs (2) are provided in multiple ways, including a first reinforcing rib (21), a second reinforcing rib (22) and a third reinforcing rib (23); along the length direction of the opening area (12), the first reinforcing rib (21) is provided at the first end of the opening area (12), the second reinforcing rib (22) is provided at the second end of the opening area (12), and the third reinforcing rib (23) is provided between the first reinforcing rib (21) and the second reinforcing rib (22).

10. The battery explosion-proof valve according to claim 9, characterized in that, The ratio A of the length to the width of the opening area (12), the area S of the opening area (12), and the area S1 occupied by the reinforcing rib (2) satisfy 1.5≤A×S / S1≤475.

11. The battery explosion-proof valve according to claim 9, characterized in that, Both the first reinforcing rib (21) and the second reinforcing rib (22) are arc-shaped structures, with the arc opening of the first reinforcing rib (21) and the arc opening of the second reinforcing rib (22) being arranged opposite to each other.

12. The battery explosion-proof valve according to claim 9, characterized in that, The third reinforcing rib (23) includes a first rib (231) and a second rib (232). The first rib (231) extends along the length direction of the opening area (12), and the second rib (232) extends along the width direction of the opening area (12). At least one of the first rib (231) and the second rib (232) is provided, and the first rib (231) and the second rib (232) are connected.

13. The battery explosion-proof valve according to claim 8, characterized in that, Along the length direction of the opening area (12), the minimum distance between two adjacent reinforcing ribs (2) is a, which satisfies 4mm≤a≤30mm.

14. The battery explosion-proof valve according to claim 13, characterized in that, The ratio A of the length to the width of the opening area (12), the area S of the opening area (12), and the area S1 occupied by the reinforcing rib (2) satisfy 1.6≤A×S / S1≤475.

15. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that, Along the length direction of the opening area (12), the minimum distance between the notch (11) and the reinforcing rib (2) is b, which satisfies 2mm≤b≤30mm.

16. The battery explosion-proof valve according to any one of claims 1 to 7, characterized in that, The groove (11) extends circumferentially on the sheet (1), and the groove (11) is discontinuous along the extension direction of the groove (11), and a connecting section (13) is formed at the discontinuity.

17. A battery, characterized in that, The battery includes a battery explosion-proof valve according to any one of claims 1 to 16, the battery further includes a housing (3) and a cover plate (4), at least one end of the housing (3) is provided with an opening, the cover plate (4) is connected to the housing (3) and seals the opening, the housing (3) and the cover plate (4) enclose to form an accommodating space, the battery explosion-proof valve is disposed on the housing (3) and / or the cover plate (4); the battery further includes a battery cell, the battery cell is disposed in the accommodating space.

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