A pressure relief explosion-proof valve for a battery pack

Abstract

The utility model discloses a kind of pressure relief explosion-proof valve for battery pack, including valve body, pressure relief valve piece, piston, pressure spring, first sealing ring, second sealing ring and protective cover, by setting threaded connecting column body structure between pressure relief valve piece and piston, ensure the close cooperation between both, effectively avoid the leakage problem due to connection loosening under high pressure. Furthermore, the inside of valve body is provided with a ribbed beam, which enhances the pressure resistance of the valve body, allowing it to maintain good structural stability during multiple uses. Through these designs, the pressure relief explosion-proof valve can maintain efficient work for a long time, reducing the risk of failure that may be caused by improper use or long-term high-pressure work. At the same time, the utility model can be flexibly selected according to the actual use scenario and installation requirements. Whether it is a device that needs to be installed conveniently or a situation that requires high connection strength, different valve body designs can effectively meet the needs.

Description

Technical Field

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

[0002] With the increase in battery energy density and the widespread application of energy storage systems, battery packs may generate excessively high internal pressure during charging and discharging, leading to equipment damage or even safety accidents such as fires. Therefore, designing an efficient and reliable pressure relief valve has become crucial to ensuring the safe operation of battery packs.

[0003] Traditional pressure relief valves mostly employ a single sealing structure, resulting in slow response and poor sealing performance, making it difficult to meet the safety requirements of modern battery packs. Furthermore, existing pressure relief valves have complex structures and high manufacturing costs, hindering large-scale production and application.

[0004] Therefore, there is an urgent need for a pressure relief valve with a simple structure, excellent sealing performance, and rapid response to improve the safety and reliability of battery packs.

[0005] A search revealed a Chinese patent document disclosing a pressure relief valve and battery pack [Application No.: 202310293063.X, Publication No.: CN116428396A], which includes a valve seat, a valve body, and a sliding assembly. The valve body is mounted on the valve seat, and a pressure relief gap is provided between the valve body and the valve seat. The valve body is connected to the valve seat through the sliding assembly. Although this invention can achieve the purpose of this utility model, this patent further optimizes the protective cover structure, enhances the sealing performance and reliability of the pressure relief valve in harsh environments, and has a wider range of application prospects. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a pressure relief explosion-proof valve for battery packs.

[0007] A pressure relief explosion-proof valve for a battery pack includes a valve body, a pressure relief valve plate, a piston, a pressure spring, a first sealing ring, a second sealing ring, and a protective cover, characterized in that: The valve body has an axial guide hole in the middle. The pressure relief valve plate is installed at the upper end of the valve body; One end of the piston passes through the guide hole in the valve body and connects to the valve plate; The pressure spring is sleeved on the outside of the piston, with one end abutting against the end face of the piston and the other end abutting against the valve body; The first sealing ring is located between the pressure relief valve plate and the valve body; The second sealing ring is located at the lower end of the valve body; The protective cover is fitted over the piston and the pressure spring.

[0008] Preferably, the lower part of the pressure relief valve plate is provided with a column structure for threaded connection with the piston.

[0009] The above technical solution effectively improves the sealing performance and reliability of the pressure relief explosion-proof valve. The lower part of the pressure relief valve plate is equipped with a cylindrical structure that is threadedly connected to the piston, ensuring a tight connection between the two and preventing seal failure due to an unstable connection. This cylindrical structure effectively distributes the pressure evenly between the valve plate and the piston, ensuring stable operation even under high pressure.

[0010] Specifically, the threaded connection cylinder structure provides a simple and robust connection method, allowing for a more precise fit between the pressure relief valve plate and the piston, effectively preventing the sealing ring from shifting or loosening during use. This optimized design ensures a smoother and safer pressure relief process when the valve body releases high pressure. Simultaneously, this design reduces wear between the valve body and the piston, extending the equipment's service life.

[0011] Preferably, the valve body is equipped with reinforcing beams.

[0012] The above technical solutions improve the overall strength and stability of the pressure relief explosion-proof valve. The internal reinforcing beam design enhances the valve body's pressure resistance, preventing deformation or cracking under high-pressure operating conditions. This reinforcing beam structure, through its rational distribution and design, effectively strengthens the valve body's structure while maintaining its lightweight and stability.

[0013] Specifically, the evenly distributed ribs inside the valve body ensure its rigidity under pressure, preventing damage due to uneven pressure during pressure relief. This optimized design significantly extends the service life of the pressure relief explosion-proof valve and maintains stable sealing performance over multiple uses. The ribs also prevent excessive expansion of the valve body under high pressure, effectively preventing deformation that may occur during operation.

[0014] Preferably, the pressure spring is sleeved on the outside of the piston and abuts against the end face of the piston and the rib beam of the valve body in the axial direction.

[0015] The above technical solution ensures the efficient operation of the pressure relief explosion-proof valve under high-pressure environments. The design of the pressure spring sleeved on the outside of the piston and axially abutting against the piston end face and the valve body's reinforcing beam enhances piston stability and ensures the valve can open rapidly under the set pressure, thereby effectively releasing internal pressure.

[0016] Specifically, this spring structure, through contact with the piston end face and valve body ribs, provides more uniform pressure transmission, enabling the valve to activate promptly when the pressure reaches the set value, thus preventing equipment damage due to excessive pressure. This structural design not only improves the response speed of the pressure relief valve but also optimizes its operational stability, ensuring reliable release under high-pressure environments.

[0017] Preferably, the outer diameter of the piston is matched with the inner diameter of the valve body guide hole.

[0018] The above technical solution ensures the precise guidance of the pressure relief explosion-proof valve. The design that matches the outer diameter of the piston with the inner diameter of the valve body guide hole ensures smooth movement of the piston within the valve body, reducing friction and jamming caused by improper fit between the piston and the valve body.

[0019] Specifically, the outer diameter of the piston is precisely matched with the inner diameter of the valve body guide hole, allowing the piston to slide smoothly during operation and avoiding instability caused by excessive or insufficient clearance. By optimizing the matching relationship between the outer and inner diameters, this invention not only improves the sealing performance of the pressure relief valve but also reduces piston wear during operation, extending the valve's service life.

[0020] Preferably, the upper part of the valve body is provided with a first sealing groove that matches the first sealing ring, and the lower part of the valve body is provided with a second sealing groove that matches the second sealing ring. The first sealing groove is located in the mating area between the valve body and the pressure relief valve plate, and the second sealing groove is located at the lower end of the valve body.

[0021] The above technical solution ensures the high-efficiency sealing performance of the pressure relief explosion-proof valve. The upper part of the valve body is equipped with a sealing groove one that matches the first sealing ring, and the lower part of the valve body is equipped with a sealing groove two that matches the second sealing ring. This design ensures that the valve maintains good sealing performance under different pressures, preventing leakage.

[0022] Specifically, the design of sealing groove one and sealing groove two, through their reasonable distribution and coordination, ensures that sealing ring one and sealing ring two form a double sealing barrier at the contact point between the valve body and the pressure relief valve plate, effectively preventing external media from entering the valve body or internal media from leaking. This double sealing structure greatly improves the valve's sealing performance, enabling it to maintain a stable sealing effect even in high-pressure operating environments.

[0023] Preferably, the valve body has one of the following structural forms: a) a cylindrical structure with external threads at the bottom; b) a flange-shaped structure; c) a structure with internal thread mounting holes at the bottom.

[0024] The above technical solutions provide a wider range of valve body structure options. The various structural forms of the valve body give the pressure relief explosion-proof valve greater adaptability and flexibility, allowing it to be selected according to different usage requirements.

[0025] Specifically, the three different valve body structures are designed to suit various installation requirements and operating environments. For applications requiring easy installation and disassembly, a cylindrical structure with external threads can be selected; while in applications demanding enhanced connection strength, a flange-type structure offers greater stability; and for equipment requiring internal thread installation, a structure with internal thread mounting holes at the bottom is more suitable. These different structural designs allow for flexible selection based on actual needs, expanding the product's application range.

[0026] Compared with the prior art, the present invention has the following advantages: 1. This utility model ensures a tight fit between the pressure relief valve plate and the piston by incorporating a threaded connection column structure, effectively preventing leakage caused by loose connections under high pressure. Furthermore, internal ribs within the valve body enhance its pressure resistance, enabling it to maintain good structural stability during repeated use. These designs allow the pressure relief explosion-proof valve to maintain efficient operation for extended periods, reducing the risk of valve failure due to improper use or prolonged high-pressure operation.

[0027] 2. The valve body structure of this utility model can be flexibly selected according to actual usage scenarios and installation requirements. Whether it is equipment requiring convenient installation or occasions with high requirements for connection strength, different valve body designs can effectively meet the needs. This versatility enhances the applicability of the valve in different equipment, and is especially suitable for fields with high requirements for reliability and stability, such as battery packs and energy storage systems. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the flange-shaped valve body structure of this utility model; Figure 2 This is a three-dimensional schematic diagram of the cylindrical valve body structure with an internal thread mounting hole at the bottom of this utility model. Figure 3 This is a three-dimensional schematic diagram of the cylindrical valve body structure with external threads at the bottom of this utility model; In the diagram: 1. Pressure relief valve plate; 2. Valve body; 3. Piston; 4. Pressure spring; 5. First sealing ring; 6. Second sealing ring; 7. Protective cover. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1 to 3 This utility model provides a technical solution: A pressure relief explosion-proof valve for a battery pack includes a valve body 2, a pressure relief valve plate 1, a piston 3, a pressure spring 4, a first sealing ring 5, a second sealing ring 6, and a protective cover 7, characterized in that: Valve body 2 has an axial guide hole in the middle; The pressure relief valve plate 1 is installed at the upper end of the valve body 2; One end of the piston 3 passes through the guide hole of the valve body 2 and is connected to the valve plate 1; The pressure spring 4 is sleeved on the outside of the piston 3, with one end abutting against the end face of the piston 3 and the other end abutting against the valve body 2; The first sealing ring 5 is located between the pressure relief valve plate 1 and the valve body 2; The second sealing ring 6 is located at the lower end of the valve body 2; The protective cover 7 is fitted over the piston 3 and the pressure spring 4.

[0031] Specifically, the lower part of the pressure relief valve plate 1 is provided with a column structure for threaded connection with the piston 3, which can effectively improve the sealing performance and reliability of the pressure relief explosion-proof valve. The column structure at the lower part of the pressure relief valve plate 1, which is threaded to the piston 3, ensures a tight connection between the two, preventing sealing failure due to an unstable connection. This column structure can effectively distribute the pressure evenly between the valve plate 1 and the piston 3, ensuring stable operation even under high pressure.

[0032] Specifically, the threaded connection cylinder structure provides a simple and robust connection method, making the fit between the pressure relief valve plate 1 and the piston 3 more precise and effectively preventing the sealing ring 5 from shifting or loosening during use. This optimized design ensures a smoother and safer pressure relief process for the valve body 2 during high-pressure release. Simultaneously, this design reduces wear between the valve body 2 and the piston 3, extending the equipment's service life.

[0033] In practical applications, this cylindrical structure not only improves the sealing performance of the pressure relief valve but also enhances its reliability under extreme conditions, making it particularly suitable for equipment requiring frequent opening and closing or high-pressure operation, such as energy storage systems and battery packs. This design is of great significance for improving valve efficiency and safety, and ensuring stable equipment operation.

[0034] Specifically, the valve body 2 incorporates internal reinforcing beams, which enhance the overall strength and stability of the pressure relief explosion-proof valve. This internal reinforcing beam design strengthens the valve body 2's pressure resistance, preventing deformation or cracking under high-pressure operating conditions. Through its rational distribution and design, this reinforcing beam structure effectively enhances the structural strength of the valve body 2 while maintaining its lightweight and stability.

[0035] Specifically, the evenly distributed ribs inside valve body 2 ensure its rigidity under pressure, preventing damage due to uneven pressure during pressure relief. This optimized design significantly extends the service life of the pressure relief explosion-proof valve and maintains stable sealing performance over multiple uses. The ribs also prevent excessive expansion of valve body 2 under high pressure, effectively preventing deformation that may occur during operation.

[0036] In practical applications, this ribbed beam structure design gives the valve body 2 higher stability and pressure resistance, making it particularly suitable for equipment such as battery packs and energy storage systems that need to withstand high pressure. It can ensure that the valve can still operate stably for a long time under harsh conditions, significantly improving the safety and reliability of the equipment.

[0037] Specifically, the pressure spring 4 is sleeved on the outside of the piston 3 and abuts axially against the end face of the piston 3 and the rib of the valve body 2, respectively. This design ensures the efficient operation of the pressure relief explosion-proof valve under high-pressure environments. The design of the pressure spring 4 being sleeved on the outside of the piston 3 and abutting axially against the end face of the piston 3 and the rib of the valve body 2 enhances the stability of the piston 3 and ensures that the valve can open rapidly under the set pressure, thereby effectively releasing internal pressure.

[0038] Specifically, this spring structure, through contact with the end face of piston 3 and the rib beam of valve body 2, provides a more uniform pressure transmission, enabling the valve to activate promptly when the pressure reaches the set value, thus preventing equipment damage due to excessive pressure. Through this structural design, the pressure spring 4 not only improves the response speed of the pressure relief valve but also optimizes its operational stability, ensuring reliable release under high-pressure environments.

[0039] In practical applications, the design of this pressure spring 4 can significantly improve the working efficiency of the pressure relief explosion-proof valve. Especially in battery packs and energy storage systems, it can ensure that the system can quickly release pressure under overload conditions, thereby avoiding safety accidents caused by excessive pressure and improving the safety and stability of the system.

[0040] Specifically, the outer diameter of piston 3 is matched with the inner diameter of the guide hole of valve body 2, which ensures the precise guidance of the pressure relief explosion-proof valve. The design of matching the outer diameter of piston 3 with the inner diameter of the guide hole of valve body 2 ensures the smooth movement of piston 3 within valve body 2, reducing friction and jamming caused by improper fit between piston 3 and valve body 2.

[0041] Specifically, the outer diameter of piston 3 is precisely matched with the inner diameter of the guide hole of valve body 2, enabling piston 3 to slide smoothly during movement and avoiding operational instability caused by excessive or insufficient clearance. By optimizing the matching relationship between the outer and inner diameters, this invention not only improves the sealing performance of the pressure relief valve but also reduces wear on piston 3 during operation, extending the service life of the valve.

[0042] In practical applications, this precise design is crucial for the stable operation of the pressure relief explosion-proof valve in high-pressure environments. It is particularly suitable for systems that require precise control of pressure release, such as battery packs and energy storage devices. It ensures that the valve can accurately and reliably release pressure in any working environment, significantly improving the safety and durability of the equipment.

[0043] Specifically, the upper part of the valve body 2 is provided with a first sealing groove adapted to the first sealing ring 5, and the lower part of the valve body 2 is provided with a second sealing groove adapted to the second sealing ring 6. The first sealing groove is located in the mating area between the valve body 2 and the pressure relief valve plate 1, and the second sealing groove is located at the lower end of the valve body 2, which can ensure the high-efficiency sealing performance of the pressure relief explosion-proof valve. The design of the upper part of the valve body 2 having a first sealing groove adapted to the first sealing ring 5 and the lower part of the valve body 2 having a second sealing groove adapted to the second sealing ring 6 ensures that the valve always maintains good sealing performance under different pressures, avoiding leakage.

[0044] Specifically, the design of sealing groove one and sealing groove two, through reasonable distribution and coordination, ensures that sealing ring one 5 and sealing ring two 6 form a double sealing barrier at the contact point between the valve body 2 and the pressure relief valve plate 1, effectively preventing external media from entering the valve body 2 or internal media from leaking. This double sealing structure greatly improves the valve's sealing performance, enabling it to maintain a stable sealing effect even in high-pressure working environments.

[0045] In practical applications, this sealing groove design is particularly suitable for equipment requiring high-precision sealing, such as battery packs and energy storage systems. Through optimized sealing design, the safety and stability of the pressure relief explosion-proof valve can be significantly improved, ensuring long-term sealing performance during operation and preventing safety hazards caused by leakage.

[0046] Specifically, the valve body 2 can be selected from the following structural forms: a) a cylindrical structure with external threads at the bottom; b) a flange-shaped structure; c) a structure with internal thread mounting holes at the bottom. This provides a more diverse range of valve body structure options. The multiple structural forms of the valve body 2 give the pressure relief explosion-proof valve stronger adaptability and flexibility, and can be selected according to different usage requirements.

[0047] Specifically, the three different valve body structures are designed to suit various installation requirements and operating environments. For applications requiring easy installation and disassembly, a cylindrical structure with external threads can be selected; while in applications demanding enhanced connection strength, a flange-type structure offers greater stability; and for equipment requiring internal thread installation, a structure with internal thread mounting holes at the bottom is more suitable. These different structural designs allow for flexible selection based on actual needs, expanding the product's application range.

[0048] In practical applications, this diverse structural design can meet the installation requirements of different types of equipment. In particular, in battery packs and energy storage systems, it can provide more stable and safer valve solutions according to the installation requirements of the equipment, ensuring the long-term stable operation of the equipment.

[0049] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0050] Furthermore, 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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure relief explosion-proof valve for a battery pack, comprising a valve body (2), a pressure relief valve plate (1), a piston (3), a pressure spring (4), a first sealing ring (5), a second sealing ring (6), and a protective cover (7), characterized in that: The valve body (2) has an axial guide hole in the middle. The pressure relief valve plate (1) is installed at the upper end of the valve body (2); One end of the piston (3) passes through the guide hole of the valve body (2) and is connected to the valve plate (1); The pressure spring (4) is sleeved on the outside of the piston (3), with one end abutting against the end face of the piston (3) and the other end abutting against the valve body (2); The first sealing ring (5) is located between the pressure relief valve plate (1) and the valve body (2); The second sealing ring (6) is located at the lower end of the valve body (2); The protective cover (7) is fitted over the piston (3) and the pressure spring (4).

2. The pressure relief explosion-proof valve according to claim 1, characterized in that: The lower part of the pressure relief valve plate (1) is provided with a column structure for threaded connection with the piston (3).

3. The pressure relief explosion-proof valve according to claim 1, characterized in that: The valve body (2) is provided with internal reinforcing beams.

4. The pressure relief explosion-proof valve according to claim 3, characterized in that: The pressure spring (4) is sleeved on the outside of the piston (3) and abuts against the end face of the piston (3) and the rib beam of the valve body (2) in the axial direction.

5. The pressure relief explosion-proof valve according to claim 1, characterized in that: The outer diameter of the piston (3) is matched with the inner diameter of the guide hole of the valve body (2).

6. The pressure relief explosion-proof valve according to claim 1, characterized in that: The upper part of the valve body (2) is provided with a first sealing groove that is adapted to the first sealing ring (5), and the lower part of the valve body (2) is provided with a second sealing groove that is adapted to the second sealing ring (6). The first sealing groove is located in the mating area between the valve body (2) and the pressure relief valve plate (1), and the second sealing groove is located at the lower end of the valve body (2).

7. The pressure relief explosion-proof valve according to claim 1, characterized in that: The valve body (2) can be any one of the following structural forms: a) a cylindrical structure with external threads at the bottom; b) a flange-shaped structure; c) a structure with internal thread mounting holes at the bottom.

Images