Explosion-proof valve, cover plate assembly and battery

Abstract

The utility model provides a kind of explosion-proof valve, cover plate assembly and battery, the explosion-proof valve includes valve body and positioning part, and the valve body is equipped with notch and partition, and partition is located between the two ends of notch;Positioning part is connected with valve body, and is set outwards to valve body protruding.When explosion-proof valve is installed on cover plate, the installation position of explosion-proof valve on cover plate is quickly positioned by positioning part, explosion-proof valve and cover plate are assembled conveniently, the position of notch and partition is relatively fixed, ensure that the opening valve value of explosion-proof valve is consistent, improve the reliability of battery.

Description

Technical Field

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

[0002] The battery explosion-proof valve is one of the core components of battery safety design. Under conditions of overcharging, over-discharging, short circuit, or high temperature, internal side reactions (such as electrolyte decomposition and electrode material thermal runaway) occur, generating large amounts of gas (CO, H2, CH4, etc.) and heat, causing a sudden increase in internal pressure. When the pressure exceeds a threshold, the explosion-proof valve opens rapidly, releasing the gas, reducing internal pressure, and preventing the probability of the battery casing exploding and causing thermal runaway.

[0003] In related technologies, explosion-proof valves are thin sheets made of metal, typically circular, square, or racetrack-shaped. These valves have notched, partially closed sections that divide the valve body into different areas. Maintaining consistency in the opening threshold of explosion-proof valves is challenging. A low opening threshold leads to unexpected pressure relief; a high threshold can cause battery thermal runaway, affecting battery reliability. Utility Model Content

[0004] The embodiments of this utility model provide an explosion-proof valve, a battery cover, and a battery, which can improve the technical problem of poor consistency in the opening value of the explosion-proof valve.

[0005] In a first aspect, embodiments of this utility model provide an explosion-proof valve, including a valve body and a positioning part. The valve body has a notch and a partition, with the partition located between the two ends of the notch. The positioning part is connected to the valve body and protrudes outward from the valve body. When the explosion-proof valve is installed on a cover plate, the positioning part quickly positions the valve on the cover plate, facilitating assembly of the valve and the cover plate. The relatively fixed positions of the notch and the partition ensure consistent valve opening values ​​and improve battery reliability.

[0006] In some embodiments, the projection of the positioning part on the side of the valve body and the projection of the partition part on the side of the valve body are staggered. The projection of the positioning part on the side of the valve body refers to its radial projection along the valve body. The projection of the partition part on the side wall of the valve body refers to its radial projection along the valve body. By designing the positioning part and the partition part to be staggered, the position of the partition part is positioned, ensuring consistent valve opening of the explosion-proof valve.

[0007] In some embodiments, the centerline of the positioning part and the centerline of the partition part are arranged perpendicular to each other. Here, the centerline of the positioning part refers to the geometric axis of symmetry of the positioning part, and the centerline of the partition part refers to the geometric axis of symmetry of the partition part. Designing them to be perpendicular simplifies the manufacturing process.

[0008] In some embodiments, the sides of the positioning portion are arc-shaped. The arc-shaped contour of the positioning portion reduces the possibility of material tearing or wrinkling caused by straight and angular contours, and facilitates processing.

[0009] In some embodiments, the side diameter of the positioning part is d, where 2mm ≤ d ≤ 6mm. The side diameter of the positioning part is reasonably designed; if it is less than 2mm, it cannot be effectively positioned; if it is greater than 6mm, the positioning part occupies too much space, affecting the structural strength of the explosion-proof valve.

[0010] In some embodiments, the side diameter of the positioning part is d, and the inner diameter of the groove is D, wherein 0.5D≤d≤1.5D. The side diameter of the positioning part and the inner diameter of the groove are coordinated, and the design is reasonable according to the different sizes of the groove, which not only ensures the positioning function, but also reduces the possibility of the positioning part occupying too much space and affecting the structural strength of the explosion-proof valve.

[0011] Secondly, embodiments of the present invention provide a cover plate assembly, comprising:

[0012] The explosion-proof valve described in any of the above items;

[0013] The cover plate has a mounting groove adapted to the explosion-proof valve. The bottom of the mounting groove has a pressure relief hole. The explosion-proof valve is installed in the mounting groove and the pressure relief hole is closed. The area defined by the groove is at least partially opposite to the pressure relief hole.

[0014] In this embodiment, a positioning part is provided on the valve body and a matching mounting groove is designed on the cover plate to achieve positioning and fit, simplifying the installation process of the explosion-proof valve on the cover plate. This design ensures the consistency of the opening value of the explosion-proof valve, thereby improving the reliability of the battery.

[0015] In some embodiments, the partition is located between the center of the explosion-proof valve and the center of the cover plate. Positioning the partition closer to the center of the cover plate is advantageous compared to positioning the partition closer to the center of the cover plate. Compared to other locations, the deformation of the score line is smaller when the explosion-proof valve deforms. This reduces the likelihood of premature opening of the explosion-proof valve due to excessive local deformation of the score line, thus improving the reliability of the explosion-proof valve.

[0016] In some embodiments, the shortest distance between the side of the limiting part and the side of the cover plate is S1, and the shortest distance between the side of the valve body and the side of the cover plate is S2, wherein S2 < S1. The explosion-proof valve is positioned near the side of the cover plate, while the limiting part is positioned away from the cover plate, avoiding spatial conflict between the two in the same area and allowing for more efficient use of the limited space on the cover plate.

[0017] In some embodiments, a gap L is formed between the edge of the explosion-proof valve and the wall of the mounting groove, wherein 0.05mm ≤ L ≤ 0.15mm. This satisfies the assembly and welding requirements of the explosion-proof valve and the cover plate.

[0018] Secondly, embodiments of the present invention provide a battery including a cover assembly as described in any of the preceding claims.

[0019] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0020] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional schematic diagram of the explosion-proof valve provided in an embodiment of this utility model;

[0022] Figure 2 This is a top view of the explosion-proof valve provided in an embodiment of this utility model;

[0023] Figure 3 This is a three-dimensional schematic diagram of the cover plate provided in an embodiment of this utility model;

[0024] Figure 4 This is a top view of the cover plate assembly provided in an embodiment of this utility model.

[0025] The labels in the attached diagram are:

[0026] 100. Explosion-proof valve; 110. Valve body; 120. Score; 130. Partition; 140. Positioning part;

[0027] 200, cover plate assembly; 210, cover plate; 211, mounting groove; 220, pressure relief hole. Detailed Implementation

[0028] 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 only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0029] The explosion-proof valve 100 on the battery is a crucial component for ensuring battery safety. Its core function is to rapidly release pressure when abnormal internal pressure or temperature occurs, preventing accidents such as explosions and fires. The explosion-proof valve 100 consists of a valve body 110, which not only secures the valve 100 but also connects the battery cover 210 to the internal space, providing a pressure relief channel for safety. Typically, the explosion-proof valve 100 is made of metal to ensure its robustness and durability. The rupture disc or diaphragm of the explosion-proof valve 100 has pre-designed weak points, such as notches 120. These notches 120 are designed to be non-closed, meaning they do not form a complete closed loop. These pre-designed non-closed weak areas effectively control the rupture direction and path of the rupture disc under pressure, thus avoiding fragmentation or secondary damage that could result from irregular rupture. Studies show that the valve body 110 of the explosion-proof valve 100 typically adopts a regular shape, such as circular or ball-shaped, to improve its stability. However, when the explosion-proof valve 100 is installed on the cover plate 210, the random installation process results in a random distribution of the grooves 120, which affects the opening consistency of the explosion-proof valve 100.

[0030] To solve the above problems, see [link to relevant documentation]. Figure 1 and Figure 2 This application provides an explosion-proof valve 100, which includes a valve body 110 and a positioning part 140. The valve body 110 has a notch 120 and a partition part 130, with the partition part 130 located between the two ends of the notch 120. The notch 120 is not completely closed, and the portion of the valve body 110 between the two ends of the notch 120 constitutes the partition part 130. The positioning part 140 is connected to the valve body 110 and protrudes outward from the valve body 110. The thickness of the valve body 110 at the notch 120 position is greater than the thickness of the valve body 110 at the partition part 130 position.

[0031] In this embodiment, when the explosion-proof valve 100 is installed on the cover plate 210, the positioning part 140 quickly positions the explosion-proof valve 100 on the cover plate 210, facilitating the assembly of the explosion-proof valve 100 and the cover plate 210. The positions of the notch 120 and the partition part 130 are relatively fixed, ensuring that the opening value of the explosion-proof valve 100 is consistent and improving the reliability of the battery. The positioning technology used ensures the correct positioning of the notch 120, thereby improving the performance and reliability of the explosion-proof valve 100.

[0032] In some embodiments, see Figure 2 The projection of the positioning part 140 on the side of the valve body 110 is offset from the projection of the partition part 130 on the side of the valve body 110. Specifically, the projection of the positioning part 140 on the side of the valve body 110 refers to the projection of the positioning part 140 on the side of the valve body 110 along the radial direction. The projection of the partition part 130 on the side wall of the valve body 110 refers to the projection of the partition plate on the side wall of the valve body 110 along the radial direction.

[0033] In the structural design of the explosion-proof valve 100, the spatial arrangement of the positioning part 140 and the isolation part 130 plays a crucial role in its performance. In this embodiment, by designing the positioning part 140 and the isolation part 130 to be staggered, the position of the isolation part 130 is positioned to ensure the consistency of the explosion-proof valve 100's opening. During the actual operation of the explosion-proof valve 100, when the internal pressure reaches a critical value, the explosion-proof valve 100 needs to open promptly and stably to release the pressure and ensure equipment safety. If the positioning part 140 and the isolation part 130 are not staggered, the position of the isolation part 130 may shift due to installation errors or vibrations during operation, leading to inconsistent responses when the explosion-proof valve 100 opens. The structural strength of the isolation part 130 is identical to that without the positioning part 140. This ensures that the explosion-proof valve 100 can complete the opening action with highly consistent performance standards under different working conditions and operating environments. The misaligned positioning part 140 and the partition part 130 can work together to ensure that the key parameters such as the pressure threshold and opening speed of the explosion-proof valve 100 remain stable each time it is opened, which greatly improves the reliability of the explosion-proof valve 100.

[0034] In some embodiments, see Figure 2 The center line of the positioning part 140 and the center line of the partition part 130 are arranged perpendicular to each other. The center line of the positioning part 140 refers to the geometric axis of symmetry of the positioning part 140, and the center line of the partition part 130 refers to the geometric axis of symmetry of the partition part 130.

[0035] In the embodiments of this application, the center line of the positioning part 140 and the center line of the partition part 130 are designed to be perpendicular to each other. This design not only simplifies the manufacturing process but also improves the stability and accuracy of the structure. This configuration ensures that each component is easier to position and adjust during assembly, thereby reducing production time and costs and improving the overall quality of the product.

[0036] In some embodiments, see Figure 2 The side of the positioning part 140 is arc-shaped.

[0037] In this embodiment, the positioning part 140 is designed with an arc-shaped profile to reduce material tearing or wrinkling problems caused by traditional straight and angular profiles. This design optimizes the uniformity of material stress, reduces the risk of damage during processing, and improves product durability and quality. By adopting an arc-shaped design, the positioning part 140 can better adapt to the characteristics of various materials, ensuring smooth processing and thus improving production efficiency and finished product quality.

[0038] In other embodiments, the side of the positioning part 140 can be a linear polygon, a composite curve, or an irregular shape. A linear polygon can be a triangle, a regular hexagon, a trapezoid, or other shapes. A composite curve can be formed by splicing together elliptical arc segments of different curvatures or a wavy curve. An irregular shape can be a leaf shape, etc.

[0039] In some embodiments, see Figure 2 The side diameter of the positioning part 140 is d, where 2mm ≤ d ≤ 6mm. The value of d is 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm or other unlisted values.

[0040] In this embodiment, the design of the side diameter of the positioning part 140 is crucial, as its rationality directly affects the performance and structural strength of the explosion-proof valve 100. If the diameter is less than 2mm, the positioning part 140 cannot function effectively, resulting in inaccurate positioning. Furthermore, its small size makes it difficult to manufacture. If the diameter is greater than 6mm, the positioning part 140 will occupy excessive structural space when mounted on the cover plate 210, weakening the overall strength of the cover plate 210 and potentially adversely affecting the battery's voltage resistance. Therefore, a diameter between 2mm and 6mm is the ideal range to ensure that the positioning part 140 functions effectively without compromising the battery's structural strength.

[0041] In some embodiments, see Figure 2 The side diameter of the positioning part 140 is d, and the inner diameter of the notch 120 is D, where 0.5D ≤ d ≤ 1.5D. The value of d can be 0.5D, 0.7D, 0.9D, 1.1D, 1.4D, 1.5D, or other unlisted values. The value of D can be 4mm.

[0042] In a specific embodiment of this application, this design not only ensures the reliability of the positioning function, but also designs the size of the positioning part 140 according to the size of the notch 120, achieving perfect coordination between the positioning part 140 and the notch 120. This effectively reduces the space occupation that might result from an excessively large positioning part 140, while avoiding any impact on the structural strength of the explosion-proof valve 100. It provides an effective method to optimize space utilization while maintaining structural strength, ensuring the safety and stability of the product in actual use.

[0043] Secondly, see Figure 3 and Figure 4 An embodiment of this utility model provides a cover plate assembly 200, including the explosion-proof valve 100 and the cover plate 210 described above. The cover plate 210 is provided with a mounting groove 211 adapted to the explosion-proof valve 100. The bottom of the mounting groove 211 is provided with a pressure relief hole 220. The explosion-proof valve 100 is installed in the mounting groove 211 and the pressure relief hole 220 is closed. The area defined by the groove 120 is at least partially opposite to the pressure relief hole 220.

[0044] In this embodiment, the cover plate 210 is designed with a mounting groove 211 that matches the explosion-proof valve 100, ensuring stable installation of the explosion-proof valve 100. The bottom of the mounting groove 211 is specially designed with a pressure relief hole 220 for releasing pressure under specific conditions, ensuring system safety. The explosion-proof valve 100 is installed within the mounting groove 211, and the pressure relief hole 220 is tightly sealed to maintain pressure under normal operating conditions. A notch 120 on the cover plate 210 defines an area that is at least partially opposite the pressure relief hole 220, ensuring that the explosion-proof valve 100 can quickly release pressure through the pressure relief hole 220 when the pressure is too high, thereby avoiding potential damage or malfunction. This design aims to improve the overall safety and reliability of the cover plate assembly 200, enabling it to provide effective explosion protection in various application scenarios.

[0045] In some embodiments, the partition portion 130 is located between the center of the explosion-proof valve 100 and the center of the cover plate 210. The radial direction of the cover plate 210, the radial direction of the valve body 110, and the center line of the partition portion 130 are on the same straight line. The partition portion 130 is located between the center of the cover plate 210 and the center of the valve body 110, and the partition portion 130 is closer to the center of the cover plate 210 than the notch 120.

[0046] In this embodiment, the partition 130 is closer to the center of the cover plate 210 than the notch 120. When the explosion-proof valve 100 deforms, the deformation of the notch 120 is smaller. This reduces the probability of the explosion-proof valve 100 opening prematurely due to large local deformation of the notch 120, thus improving the reliability of the explosion-proof valve 100.

[0047] Furthermore, the partition 130 is positioned closer to the center of the cover plate 210 than the center of the explosion-proof valve 100. This design significantly optimizes space utilization efficiency by placing the partition 130 near the center of the cover plate 210. When the explosion-proof valve 100 is opened, it opens along the preset notch 120. The opened valve body 110 is connected to another part of the valve body 110 through the partition 130, allowing the valve body 110 to flip towards the center of the cover plate 210. This flipping method requires less space, greatly promoting battery miniaturization. In addition, this design significantly improves battery safety performance, reduces space occupation during an explosion, and ensures more efficient pressure release and energy management even in a limited space, thereby enhancing the overall performance and safety of the battery.

[0048] In some embodiments, see Figure 4 The shortest distance between the side of the limiting part and the side of the cover plate 210 is S1, and the shortest distance between the side of the valve body 110 and the side of the cover plate 210 is S2, where S2 < S1.

[0049] In this embodiment, by placing the explosion-proof valve 100 near the side of the cover plate 210 and placing the limiting part away from the side of the explosion-proof valve 100 away from the cover plate 210, the potential spatial conflict between the two in the same area is effectively avoided. This layout optimization allows for more efficient use of the limited space of the cover plate 210, ensuring optimal spatial configuration between components and improving the rationality and efficiency of the overall structure.

[0050] In some embodiments, a gap L is formed between the edge of the explosion-proof valve 100 and the wall of the mounting groove 211, wherein 0.05mm ≤ L ≤ 0.15mm. The value of L can be 0.05mm, 0.07mm, 0.08mm, 0.11mm, 0.13mm, 0.15mm or other unlisted values.

[0051] In some embodiments, a certain gap L is formed between the edge of the explosion-proof valve 100 and the wall of the mounting groove 211, the size of which ranges from 0.05 mm to 0.15 mm. This gap design not only meets the assembly and welding requirements of the explosion-proof valve 100 and the cover plate 210, but also provides the necessary buffer space to accommodate thermal expansion and other potential physical changes, thereby ensuring the stability and reliability of the assembly process. Through this precise gap control, a tight fit between the cover plate 210 and the explosion-proof valve 100 is achieved, further ensuring that the battery maintains excellent performance and safety during use.

[0052] Secondly, embodiments of this utility model provide a battery, including a cover assembly 200 as described above. An explosion-proof valve 100 is typically located at the top cover of the battery. When thermal runaway occurs inside the battery due to overcharging, short circuits, overheating, or other reasons, generating a large amount of gas and heat, causing a sharp increase in internal pressure, the explosion-proof valve 100 will open to release the gas, preventing the battery from exploding due to excessive pressure. This is an important guarantee for battery safety. For example, square lithium-ion batteries generally have an explosion-proof valve 100 designed on the top of the battery compartment, which can be opened with a single button to prevent the battery from exploding when internal pressure increases.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0055] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An explosion-proof valve (100), characterized in that, include: The valve body (110) is provided with a notch (120) and a partition (130), the partition (130) being located between the two ends of the notch (120); The positioning part (140) is connected to the valve body (110) and protrudes outward from the valve body (110).

2. The explosion-proof valve (100) according to claim 1, characterized in that, The projection of the positioning part (140) on the side of the valve body (110) is offset from the projection of the partition part (130) on the side of the valve body (110).

3. The explosion-proof valve (100) according to claim 2, characterized in that, The center line of the positioning part (140) is perpendicular to the center line of the partition part (130).

4. The explosion-proof valve (100) according to claim 1, characterized in that, The side of the positioning part (140) is arc-shaped.

5. The explosion-proof valve (100) according to claim 4, characterized in that, The side diameter of the positioning part (140) is d, where 2mm≤d≤6mm.

6. The explosion-proof valve (100) according to claim 4, characterized in that, The side diameter of the positioning part (140) is d, and the inner diameter of the ring where the notch (120) is located is D, wherein 0.5D≤d≤1.5D.

7. A cover plate assembly (200), characterized in that, include: The explosion-proof valve (100) as described in any one of claims 1 to 6; The cover plate (210) is provided with a mounting groove (211) adapted to the explosion-proof valve (100). The bottom of the mounting groove (211) is provided with a pressure relief hole (220). The explosion-proof valve (100) is installed in the mounting groove (211) and the pressure relief hole (220) is closed. The area defined by the groove (120) is at least partially opposite to the pressure relief hole (220).

8. The cover plate assembly (200) according to claim 7, characterized in that, The partition (130) is located between the center of the explosion-proof valve (100) and the center of the cover plate (210).

9. The cover plate assembly (200) according to claim 7, characterized in that, The shortest distance between the side of the limiting part and the side of the cover plate (210) is S1, and the shortest distance between the side of the valve body (110) and the side of the cover plate (210) is S2, wherein S2 < S1.

10. The cover plate assembly (200) according to claim 8, characterized in that, A gap L is formed between the edge of the explosion-proof valve (100) and the wall of the mounting groove (211), wherein 0.05mm≤L≤0.15mm.

11. A battery, characterized in that, include: The cover plate assembly (200) as described in any one of claims 7 to 10.

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