Explosion-proof valve, battery pack and energy storage cabinet

Abstract

The invention provides an anti-explosion valve, a battery pack and an energy storage cabinet, and relates to the technical field of safety protection. The anti-explosion valve comprises a front cover, a gland and an elastic piece, the gland and the front cover are arranged at an interval, and the gland is provided with a sealing face used for sealing the through-flow hole; the elastic piece is arranged on the face, away from the sealing face, of the gland and connected between the front cover and the gland. When the anti-explosion valve is in a normal state, the elastic piece is compressed in the interval direction of the gland and the front cover; when the anti-explosion valve is in a valve opening state, the elastic piece is further compressed compared with a normal state, and the spacing distance between the gland and the front cover is smaller than that in the normal state. The elastic piece is connected between the gland and the front cover, so that when the anti-explosion valve is in an open state, smoke and the like in the battery box body are discharged from the through-flow hole and cannot directly scour the elastic piece, the possibility of reset failure of the elastic piece caused by the fact that viscous substances and the like in the smoke are adsorbed on the surface of the elastic piece is reduced, and the reliability of the anti-explosion valve is improved.

Description

Technical Field

[0001] This application relates to the field of safety protection technology, and in particular to an explosion-proof valve, a battery pack, and an energy storage cabinet. Background Technology

[0002] In related technologies, explosion-proof valves are core pressure protection components in equipment such as new energy vehicle battery packs and chemical reactors. Their core functions are rapid pressure relief to prevent explosions in case of overpressure, and sealing of the channel to prevent impurities and media leakage after pressure recovery. With the development of related industries, the demands for their safety, economy, and reusability continue to increase. Current mainstream explosion-proof valves are based on a "multi-component collaborative" design, including multiple parts such as the valve body, valve core, elastic reset element, sealing components, and limiting structure. These multiple components work together to achieve sealing, pressure relief, and reset functions. However, the numerous components result in a complex structure, high precision requirements for component fit, and cumbersome assembly processes, leading to high production costs. Furthermore, batteries generate gas under conditions such as thermal runaway, abnormal charging and discharging, and high-temperature environments. In particular, a large amount of gas will be generated in a short period of time during thermal runaway, causing the internal pressure of the battery to rise sharply. These gases can be discharged in time through the explosion-proof valve. However, the gases discharged from the battery box usually include sticky organic residues and solid particles. After cooling, the sticky organic residues will form a viscous film or solidified layer on the surface of the attached parts. The solid particles will be embedded in the sticky residues, forming a "particle-sticky layer" composite adhesion structure, which affects the normal function of the attached parts. Summary of the Invention

[0003] The purpose of this application is to provide an explosion-proof valve, a battery pack, and an energy storage cabinet to improve the reliability of the explosion-proof valve and reduce its cost.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] In a first aspect, this application provides an explosion-proof valve, which includes a front cover, a pressure cover, and an elastic element. The pressure cover and the front cover are spaced apart, and the pressure cover has a sealing surface for sealing a flow passage. The elastic element is disposed on the side of the pressure cover away from the sealing surface and is connected between the front cover and the pressure cover. When the explosion-proof valve is in a normal state, the elastic element is compressed in the spaced direction between the pressure cover and the front cover. When the explosion-proof valve is in an open state, the elastic element is further compressed compared to the normal state, and the spaced distance between the pressure cover and the front cover is smaller than the spaced distance in the normal state.

[0006] The elastic element is located on the side of the gland facing away from the sealing surface. The gland is visible between the elastic element and the flow orifice. When the explosion-proof valve is in the open state, flue gas and other gases inside the casing will be discharged through the flow orifice. The gland is located in the flow path of the flue gas, but the elastic element is located on the surface of the gland facing away from the sealing surface. Therefore, the flue gas will not directly scour the elastic element, reducing the possibility of viscous substances in the flue gas adsorbing onto the surface of the elastic element, thus reducing the possibility of the elastic element failing to reset and improving the reliability of the explosion-proof valve. When the explosion-proof valve is in the open state, the elastic element is further compressed compared to the normal state, and the distance between the gland and the front cover is smaller than the distance in the normal state. That is, the elastic element is in a pre-compressed state in the normal state, and its restoring force continues to act on the gland, making the sealing surface of the gland in close contact with the flow orifice. Even if the battery pack on which the explosion-proof valve is installed vibrates, the elastic element can still absorb vibration energy through deformation, avoiding instantaneous gaps between the gland and the flow orifice, which helps to improve the reliability of the explosion-proof valve. Furthermore, when the air pressure inside the battery pack with the explosion-proof valve installed drops to a certain value, the restoring force of the elastic element can be used to move the pressure cap, achieving cap reset without the need for an additional power device (such as an electric mechanism). This simplifies the structure of the explosion-proof valve and helps reduce its failure rate and production costs. Simultaneously, the explosion-proof valve provided in this application has a simple structure and fewer parts, significantly reducing component production and assembly costs, thus contributing to lowering the overall production cost of the explosion-proof valve provided in this application.

[0007] In conjunction with the first aspect, in some feasible embodiments, the explosion-proof valve also includes a guide post, the guide post and the elastic element being disposed on the same side of the gland, one end of the guide post passing through the front cover and slidably connected to the front cover, the other end of the guide post being fixedly connected to the gland, the elastic element being sleeved on the guide post and the direction in which the elastic element is compressed is the same as the sliding direction of the guide post relative to the front cover.

[0008] The guide post is slidably connected to the front cover and fixedly connected to the pressure cap, allowing the pressure cap to move axially along the guide post. This prevents the pressure cap from shifting, tilting, or jamming during movement, ensuring precise alignment with the mounting holes on the battery box when the pressure cap moves from the open position to the sealed position. This avoids sealing failure or reset jamming due to displacement deviation, thus improving the reliability of the explosion-proof valve. Simultaneously, when the pressure cap is in the sealed position, the distance between the pressure cap and the front cover is greater than the free length of the elastic element. This means the elastic element is in a pre-compressed state under normal conditions, and its restoring force continuously acts on the pressure cap, allowing it to remain stably in the sealed position. Even if the equipment with the explosion-proof valve installed vibrates, the elastic element can still absorb vibration energy through deformation, preventing momentary gaps between the pressure cap and the mounting holes, further enhancing the reliability of the explosion-proof valve. Furthermore, when the gland is in the sealed position, the elastic element is in a pre-compressed state. Therefore, when the gland is in the open position, the elastic element will be in a compressed state. This allows the gland to move using the restoring force of the elastic element when the air pressure inside the equipment with the explosion-proof valve drops to a certain value, eliminating the need for an additional power unit. This simplifies the structure of the explosion-proof valve and helps reduce its failure rate and production costs. In addition, as the internal pressure of the equipment with the explosion-proof valve decreases, the pressure acting on the elastic element gradually decreases. The restoring force of the elastic element will gradually move the gland along the guide post away from the front cover until it reaches the sealed position. During this process, the restoring force of the elastic element gradually decreases with the decrease in compression, making the gland reset process smooth and shock-free. This reduces collision and wear between the gland and the mounting hole, helping to extend the service life of the explosion-proof valve.

[0009] In conjunction with the first aspect, in some feasible ways, the front cover is provided with a flow port.

[0010] This creates a complete airflow path for the explosion-proof valve: "the flow port of the battery pack - the chamber between the pressure cap and the front cover - the flow port of the front cover." In the event of thermal runaway of the battery pack, the internal gas pushes the pressure cap closer to the front cover and can then be quickly and directly discharged through the flow port. This significantly reduces airflow resistance and improves the pressure relief response speed, rapidly reducing the internal pressure of the battery pack and helping to avoid the risk of battery pack casing deformation or explosion due to continuous pressure buildup. Furthermore, the flow port guides the airflow in a directional manner, reducing the residence time of high-temperature flue gas in the chamber between the pressure cap and the front cover, and lowering the probability of contact between viscous substances and solid particles in the flue gas and core components such as elastic elements and guide pillars. Directional airflow also avoids the scouring and wear of components caused by disordered swirling, further reducing the formation of a "particle-viscous layer" on the surface of elastic elements, ensuring the flexibility of the elastic elements, and thus reducing the risk of reset failure.

[0011] In conjunction with the first aspect, in some feasible ways, the front cover has a protrusion in the direction away from the pressure cap, and the guide post passes through the protrusion.

[0012] In this way, the front cover naturally forms a reserved travel space for the pressure cap to move towards the front cover. When the explosion-proof valve is in the open state, the pressure cap can move smoothly along the guide post to the protruding side, without the need for additional slots in the battery pack casing or housing to accommodate the pressure cap's movement. This design avoids the structural strength reduction caused by slotting the housing—slotting reduces the stress area of ​​the housing, making it prone to cracking due to vibration and pressure impact over long-term use. It also eliminates the problem of dust, sticky residue, and other impurities accumulating in the grooves, reducing the risk of impurities affecting the pressure cap's movement or sealing effect, and simplifying the battery pack casing's manufacturing process. The guide post passes through the protrusion, making the protruding structure an extension support section of the guide post, extending the effective support length of the guide post. This combination further improves the installation stability of the guide post, preventing radial swaying during pressure cap movement, while precisely constraining the pressure cap's movement trajectory, ensuring that the pressure cap always moves axially along the guide post, without shifting or tilting due to increased travel, guaranteeing the alignment accuracy of the pressure cap's sealing surface with the flow hole, thereby improving sealing reliability. Furthermore, the protruding structure extends in the same direction as the guide post, ensuring it doesn't obstruct the airflow opening of the front cover or hinder airflow from exiting through it. This avoids flow channel obstruction issues caused by the travel space design, guaranteeing pressure relief efficiency. The protruding structure is also integrally molded with the front cover, resulting in stronger structural integrity. This disperses the force transmitted by the guide post and the impact force of airflow during pressure relief, preventing stress concentration at the guide post installation location and extending the front cover's lifespan. Simultaneously, it provides circumferential protection for the guide post passing through it, reducing the probability of external impurities and moisture directly contacting the guide post's sliding surface and lowering the risk of guide post jamming due to wear or the adhesion of a "particle-adhesive layer."

[0013] In conjunction with the first aspect, in some feasible ways, the area enclosed by the edge of the front cover is larger than the area enclosed by the edge of the pressure cover.

[0014] The area enclosed by the edge of the front cover is larger than that of the pressure cover, and after installation, it can completely cover the pressure cover and the flow passage area of ​​the battery pack, forming a protective structure similar to a "shield". This structure can effectively prevent dust, mud, water vapor and other impurities in the external environment from directly contacting the sealing surface of the pressure cover, avoiding contamination or wear of the sealing surface, and ensuring the sealing reliability between the pressure cover and the flow passage. At the same time, impurities cannot easily enter the cavity between the pressure cover and the front cover, reducing the risk of contamination of internal elastic components and guide pillars, and further reducing the probability of jamming failure caused by the "particle-sticky layer". Moreover, the front cover has a larger area, and its flow passage can be set in a wider area, or the exhaust airflow can be guided to diffuse in all directions through the shielding of the front cover edge. This can prevent the exhaust high-temperature and high-pressure gas from concentrating and impacting other components in the energy storage cabinet, reducing the thermal damage or mechanical impact of the airflow on the surrounding structure. At the same time, the diffused airflow can quickly mix with the ambient air and cool down, reducing the secondary risks caused by the local accumulation of high-temperature gas. In addition, it can make the connection area between the front cover and the battery pack shell wider, the installation and fixation more stable, and the impact resistance stronger, further improving the adaptability and service life of the explosion-proof valve under complex working conditions.

[0015] In conjunction with the first aspect, in some feasible embodiments, the front cover includes a first connecting portion, a second connecting portion, and a connecting arm, the connecting arm connecting the first connecting portion and the second connecting portion, the first connecting portion, the second connecting portion, and the connecting arm being located in the same plane, and the first connecting portion, the second connecting portion, and the connecting arm enclosing to form a flow port.

[0016] The first connecting part, the second connecting part, and the connecting arm are all located in the same plane, meaning the front cover has a flat planar structure without any three-dimensional protrusions. This flat planar structure has a small thickness, allowing it to be directly embedded into narrow spaces such as thin-walled cavities and interlayers in equipment. Compared to a three-dimensional front cover, it requires less space for installation and can accommodate the integration needs of various compact devices. Furthermore, the planar structure is not dependent on a specific installation posture (horizontal, vertical, and inverted are all possible), adapting to the installation layout requirements of various devices. Therefore, placing the first connecting part, the second connecting part, and the connecting arm in the same plane helps improve the universal compatibility of the explosion-proof valve. Simultaneously, the fact that the first connecting part, the second connecting part, and the connecting arm are in the same plane allows them to be integrally molded, for example, through one-time molding processes such as stamping or injection molding. Compared to the multi-part welding and assembly of a three-dimensional front cover, this results in higher production efficiency, lower costs, and better structural consistency, effectively reducing the difficulty of quality control in mass production. Furthermore, the first connecting part, the second connecting part, and the connecting arm form a flow passage. The planar enclosed frame structure distributes the force to the first connecting part, the second connecting part, and the connecting arm. Compared with a solid front cover or a front cover made of loosely pieced together, the front cover provided in this application has improved bending and torsional strength, and can withstand the fluid impact force during overpressure relief and the reaction force of the pre-compression force of the elastic element. It can avoid problems such as cover displacement and sealing failure caused by front cover deformation.

[0017] In conjunction with the first aspect, in some feasible embodiments, the front cover includes a first connecting portion, a second connecting portion, and a connecting arm. In the stacking direction of the cover and the front cover, the second connecting portion is spaced apart from the first connecting portion, and the first connecting portion, the second connecting portion, and the connecting arm enclose to form a flow port.

[0018] In the stacking direction of the gland and the front cover, the second connecting part is spaced apart from the first connecting part, meaning the front cover has a layered structure. This layered design allows for the expansion of the effective flow passage area of ​​the flow port by increasing the stacking spacing of the connecting parts without increasing the radial dimension of the front cover, thus adapting to high-flow-rate pressure relief requirements. Furthermore, the layered arrangement of the first and second connecting parts, together with the connecting arm, forms a flow port that extends along the stacking direction. This means the opening direction of the flow port is consistent with the axial movement direction of the gland, ensuring that the flow channel is not obstructed during the opening / resetting of the gland. This guarantees unobstructed pressure relief throughout the process and effectively avoids the problem of secondary pressure accumulation inside the equipment due to flow channel blockage. Meanwhile, the first and second connecting parts are layered, with connecting arms providing rigid interlayer connections, forming a three-dimensional frame-like front cover. The reaction force of the pre-compressed elastic element is transmitted to the front cover along the stacking direction. The layered design of the first and second connecting parts can offset the elastic force through double-layer support, thereby preventing fatigue deformation of a single connecting part due to long-term pre-tightening force, ensuring the long-term stability of the pre-tightening force of the elastic element, and thus guaranteeing the consistency of the sealing pressure. In addition, the force direction of the layered first and second connecting parts is consistent with the stacking direction. Therefore, regardless of whether the equipment equipped with the explosion-proof valve provided in this application is installed horizontally, vertically, or inverted, the force transmission of the elastic element is not affected by gravity, making the explosion-proof valve provided in this application adaptable to the installation posture requirements of various equipment and helping to expand the application range of the explosion-proof valve.

[0019] In conjunction with the first aspect, in some feasible ways, the explosion-proof valve has multiple elastic elements that are equally spaced along the circumference of the first connection portion.

[0020] This design ensures that the reset / driving forces of the gland exerted by multiple elastic elements are evenly distributed circumferentially, rather than concentrated in localized areas. This avoids problems such as eccentric tilting, inadequate sealing surface fit, or localized wear caused by uneven force distribution, ensuring consistent fit between the gland and the sealing reference surface. Simultaneously, the pressure relief impact and reset reaction forces are evenly transmitted to the first and second connecting parts via the equally spaced elastic elements and corresponding connecting arms. This further prevents localized stress concentration in the support structure, reduces the risk of fatigue failure such as bending and fracture, and improves structural durability. Furthermore, the circumferentially spaced multi-point guiding constraints precisely limit the axial movement trajectory of the gland, preventing torsion and jamming, and do not obstruct the axial passage of the vent, ensuring smooth pressure relief. Combined with redundancy backup features, this further enhances the sealing, pressure relief reliability, and service life of the explosion-proof system.

[0021] In conjunction with the first aspect, in some feasible ways, the explosion-proof valve has multiple elastic elements and multiple connecting arms, with each elastic element and connecting arm connected in a one-to-one correspondence.

[0022] This design ensures that each elastic element is independently connected to a connecting arm, distributing the reset / driving force acting on the gland to multiple stress points rather than concentrating it in a single location. This avoids problems such as localized deformation and sealing surface wear caused by single-point stress on the gland, ensuring consistent contact between the gland and the sealing reference surface and improving the reliability of the explosion-proof valve. Simultaneously, the reaction forces transmitted from the elastic elements to the front cover, such as the reaction force of the reset force and the impact force during pressure relief, are evenly transmitted to the first and second connecting parts through the corresponding connecting arms. This prevents fatigue failure issues such as bending and breakage of the front cover due to localized stress concentration, improving the structural durability of the gland and front cover and extending the service life of the explosion-proof valve. Furthermore, the multiple elastic elements have redundancy backup capabilities. Even if one elastic element fails, the remaining elements can still work together to complete the opening / reset action of the gland, ensuring the sealing and pressure relief functions of the explosion-proof valve and further enhancing its reliability.

[0023] In conjunction with the first aspect, in some feasible ways, the elastic element connects the second connecting portion and the pressure cap, and the elastic element is connected to the central region of the second connecting portion.

[0024] This design ensures that the force transmission path is "center of the second connection - elastic element - pressure cap." The driving / resetting force of the elastic element is directly transmitted from the center of the second connection to the pressure cap, resulting in the shortest force flow path and no additional force transmission loss. This efficiently drives the pressure cap to complete the opening / resetting action. Simultaneously, the elastic element's connection to the central area of ​​the pressure cap maximizes the release of flow openings in the peripheral area of ​​the second connection. Furthermore, the central area of ​​the second connection is typically a region with high structural rigidity. When it concentrates the reaction force of the elastic element, the stress can quickly and evenly diffuse to the periphery, avoiding structural fatigue, deformation, or fracture caused by localized stress concentration. This extends the service life of the second connection, thereby extending the service life of the explosion-proof valve.

[0025] In conjunction with the first aspect, in some feasible ways, the projection of the second connection portion is smaller than the projection of the pressure cap in the stacking direction of the pressure cap and the front cover.

[0026] The projection of the second connecting part is smaller than that of the pressure cap, ensuring that the overall outline of the second connecting part does not exceed the peripheral boundary of the pressure cap and remains completely within the pressure cap's shielding range. Therefore, the discharged gas will not directly scour the surface of the second connecting part. This avoids the continuous impact of high-speed airflow on the second connecting part, effectively preventing wear, deformation, or fatigue cracking caused by airflow scouring. Simultaneously, if the discharged gas is corrosive, corrosion of the second connecting part can be prevented. Furthermore, if the discharged gas is high-temperature gas, it can prevent problems such as reduced structural strength of the second connecting part due to high-temperature baking, extending the service life of the front cover, which in turn helps extend the service life of the explosion-proof valve. In addition, if the projection of the second connecting part is larger than that of the pressure cap, the portion of the second connecting part extending beyond the pressure cap will obstruct gas flow, causing turbulence and eddies during gas flow, increasing flow resistance, and reducing the pressure relief rate. Therefore, in this embodiment, the projection of the second connection part is smaller than the projection of the pressure cover, so that the second connection part is completely covered by the projection of the pressure cover. Gas can be smoothly discharged along the edge of the pressure cover, so that the pressure inside the equipment with the explosion-proof valve can drop rapidly, effectively solving the problem of incomplete pressure relief caused by flow channel obstruction, and ultimately improving pressure relief efficiency.

[0027] In conjunction with the first aspect, in some feasible ways, the first connecting part is a ring structure.

[0028] This design allows the force acting on the first connection to be evenly transmitted along the annular structure 360° without stress breaks. Therefore, when the explosion-proof valve is subjected to fluid pressure, installation warning force, or vibration load, the stress can be quickly diffused throughout the entire annular structure, avoiding localized stress concentration. Compared to other types of front covers (such as split front covers), the first connection of the annular structure forms a surrounding support, with the support points covering more of the area around the mounting hole, resulting in more balanced force distribution and effectively preventing cracking at the edge of the mounting hole due to excessive localized stress.

[0029] In conjunction with the first aspect, in some feasible ways, the gland has vent holes covered with a breathable membrane.

[0030] The breathable membrane allows gas to flow in both directions. Therefore, by opening vent holes on the gland and covering the vent holes with the breathable membrane, the breathable membrane can automatically adjust the slight pressure difference between the inside and outside of the equipment where the explosion-proof valve is installed. This avoids the accumulation of pressure difference caused by temperature difference and slight gas production, thereby preventing problems such as unbalanced pressure on the gland and gaps in the sealing surface, and helps to maintain and improve the reliability of the explosion-proof valve.

[0031] In a second aspect, this application provides a battery pack including a housing and an explosion-proof valve as described in the first aspect. The housing is used to accommodate one or more battery cells and has a flow passage hole. A front cover is fixedly connected to the housing and a pressure cover covers the flow passage hole.

[0032] The battery pack in this application embodiment includes the explosion-proof valve described above. Therefore, the battery can have all the technical features and beneficial effects of the explosion-proof valve described above, which will not be repeated here.

[0033] Thirdly, this application provides an energy storage cabinet, in which multiple battery packs as described in the second aspect are stacked inside the cabinet.

[0034] The energy storage cabinet in this application embodiment includes the battery pack described above. Therefore, the energy storage cabinet can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this application.

[0036] Figure 1 These are schematic diagrams of the battery pack structure provided in some embodiments of this application;

[0037] Figure 2 This is an overall assembly drawing of a battery pack provided in some embodiments of this application;

[0038] Figure 3 This is another overall assembly drawing of the battery pack provided in some embodiments of this application;

[0039] Figure 4 This is an isometric view of an explosion-proof valve provided in some embodiments of this application;

[0040] Figure 5 yes Figure 4 Exploded view of the explosion-proof valve in the image;

[0041] Figure 6 yes Figure 4 A cross-sectional view of the explosion-proof valve in the image;

[0042] Figure 7 This is an exploded view of another explosion-proof valve provided in the embodiments of this application;

[0043] Figure 8 yes Figure 7 A cross-sectional view of the explosion-proof valve in the image.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Explosion-proof valve; 200. Battery pack; 210. Housing; 211. Flow hole; 10. Front cover; 11. Flow port; 12. First connecting part; 13. Second connecting part; 14. Connecting arm; 20. Pressure cap; 21. Vent hole; 22. Vent membrane; 31. Guide post; 32. Elastic element; 40. Sealing element. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application are within the scope of protection of this application.

[0047] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. "At least one" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0048] "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, a and / or b can mean: a exists alone, a and b exist simultaneously, or b exists alone. Here, a and b can be singular or plural.

[0049] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. Meanwhile, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is being used as an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0050] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. The term "connected" should be interpreted broadly; for example, "connected" can mean directly linked or indirectly linked through an intermediate medium. For instance, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate, for example, that two or more components have direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other.

[0051] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0052] In this application embodiment, "upper," "lower," "left," and "right" are not limited to the orientation of the components schematically placed in the accompanying drawings. It should be understood that these directional terms can be relative concepts used for description and clarification, and can vary accordingly depending on the orientation of the components in the accompanying drawings. In the drawings, for clarity, the thickness of layers and regions is exaggerated, and the dimensional proportions between the parts in the illustrations do not reflect actual dimensional proportions. Therefore, variations in shape relative to the drawings are conceivable due to, for example, manufacturing techniques and / or tolerances. Therefore, exemplary embodiments should not be construed as being limited to the shapes of the areas shown in this application, but rather include shape deviations caused, for example, by manufacturing. For example, an etched area shown as rectangular would typically have a curved feature. Therefore, the areas shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0053] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0054] Furthermore, the architecture and scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of architecture and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0055] Energy storage systems, due to their advantages such as high-efficiency energy storage and flexible deployment, have been widely used in fields such as energy storage for new energy vehicles, industrial and commercial energy storage, and energy storage base stations. Their operational safety directly affects the stable operation of application scenarios, making them a key focus of the industry. In large-scale energy storage scenarios, the core energy storage unit is typically configured in a hierarchical structure of "energy storage cabinet - battery pack - battery cell": the energy storage cabinet (or energy storage container) serves as the centralized energy storage carrier, and its interior is usually divided into multiple battery compartments or battery clusters. Multiple battery packs are stacked within each battery compartment / cluster, and each battery pack serves as an independent energy storage unit, containing multiple secondary batteries (cells), forming a large-scale energy storage system. Currently, the secondary batteries used in these application scenarios can include lithium-ion batteries, lead-acid batteries, sodium batteries, magnesium batteries, aluminum batteries, and potassium batteries, etc. In this embodiment, the secondary battery is also referred to as a rechargeable battery, power battery, or storage battery, which refers to a battery that can be recharged after discharge to activate its active materials and continue to be used. The battery pack is the carrier that integrates the battery cells and realizes electrical connection and thermal management. An energy storage cabinet is a device used to centrally house battery packs, provide protection, and manage the system. In the following embodiments of this application, unless otherwise specified, the batteries mentioned refer to secondary batteries.

[0056] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery pack provided in some embodiments of this application. The battery pack 200 includes a housing 210 and an explosion-proof valve 100. The housing 210 is used to accommodate one or more battery cells, and the explosion-proof valve 100 is mounted on the housing 210.

[0057] High-energy-density battery cells are highly susceptible to thermal runaway under conditions such as impact, overheating, compression, puncture, or abnormal charging and discharging. During thermal runaway, large amounts of high-temperature flammable gases and sticky organic residues are released. Simultaneously, plastic structural components, aluminum busbars, insulation components, and internal auxiliary materials within the battery pack melt and detach at high temperatures, forming solid particles and molten residue. These substances are ejected outwards along with the high-speed smoke. To prevent explosions caused by a rapid increase in back pressure, the battery pack's outer casing (or sidewalls) are typically equipped with explosion-proof valves. One side of the valve faces inwards towards the battery, and the other side faces outwards. When a battery malfunctions, causing internal pressure to exceed the valve's opening pressure, the valve opens, releasing internal gases to lower the battery temperature and relieve pressure, preventing further explosions and other more serious safety issues.

[0058] For example, the gas emitted from the battery casing typically includes viscous organic residues and solid particles. Upon cooling, the viscous organic residues form a viscous film or solidified layer on the surface of the adhered component. The solid particles become embedded in the viscous residues, forming a "particle-viscous layer" composite adhesion structure. For instance, when adhering to the surface of a reset component, this increases the resistance to its movement, and may even cause "stickiness and jamming," preventing complete rebound. Furthermore, the "particle-viscous layer" composite adhesion structure further exacerbates wear and jamming of the reset component, leading to decreased reset elasticity and sealing failure with prolonged use.

[0059] As can be seen from the above description, the gas emitted by the battery will affect the normal operation of the explosion-proof valve. Furthermore, different application scenarios have varying requirements for the installation space of the energy storage cabinet and the stacking method of the battery pack, which places higher demands on the assembly form of the explosion-proof valve and its compatibility with the smoke exhaust channel. Therefore, this application provides an explosion-proof valve 100, as well as a battery pack and energy storage cabinet including the explosion-proof valve 100. Please refer to... Figure 2 and Figure 3 , Figure 2 This is an overall battery assembly drawing provided in some embodiments of this application. Figure 3 This is another overall battery assembly drawing provided by some embodiments of this application, aiming to ensure that the explosion-proof valve 100 can adapt to the structural design of different battery packs, meet the requirements of large-scale stacking of energy storage cabinets and the adaptability of smoke exhaust channels, and effectively solve the aforementioned problem of explosion-proof valve failure caused by residue adhesion, thereby improving the overall safety and stability of the energy storage system. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings.

[0060] This application provides an explosion-proof valve 100, please refer to... Figure 4 , Figure 4 This is an isometric view of an explosion-proof valve provided in some embodiments of this application, such as... Figure 4 As shown, the explosion-proof valve 100 includes a front cover 10, a pressure cap 20, and an elastic element 32. The pressure cap 20 is spaced apart from the front cover 10 and has a sealing surface for sealing the flow passage 211. The elastic element 32 is disposed on the side of the pressure cap 20 away from the sealing surface and is connected between the front cover 10 and the pressure cap 20. When the explosion-proof valve 100 is in the normal state, the elastic element 32 is compressed in the spaced direction between the pressure cap 20 and the front cover 10. When the explosion-proof valve 100 is in the open state, the elastic element 32 is further compressed compared to the normal state, and the spaced distance between the pressure cap 20 and the front cover 10 is smaller than the spaced distance in the normal state.

[0061] To facilitate understanding of the technical solution of this application, the explosion-proof valve 100 will be described in conjunction with its application scenario. For example, the explosion-proof valve 100 is installed on the outer casing 210 of a battery pack. The outer casing 210 has a flow hole, and the front cover 10 is connected to the outer casing 210. The normal state means that the front cover 10 is connected to the outer casing 210, and the sealing surface of the pressure cap 20 covers the flow hole on the outer casing 210. The open state means that there is a gap between the pressure cap 20 and the flow hole, and the interior of the outer casing 210 is connected to the outside.

[0062] In this embodiment, the elastic element 32 is disposed on the side of the pressure cap 20 away from the sealing surface. It can be seen that the pressure cap 20 is spaced between the elastic element 32 and the flow hole 211. When the explosion-proof valve 100 is in the open state, the flue gas inside the outer shell 210 will be discharged from the flow hole 211. The pressure cap 20 is located on the flow path of the flue gas, but the elastic element 32 is located on the surface of the pressure cap 20 away from the sealing surface. Therefore, the flue gas will not directly wash over the elastic element 32, reducing the possibility that viscous substances in the flue gas will be adsorbed on the surface of the elastic element 32, that is, reducing the possibility of the elastic element 32 failing to reset, thereby improving the reliability of the explosion-proof valve 100. When the explosion-proof valve 100 is in the open state, the elastic element 32 is further compressed compared to the normal state, and the gap between the pressure cap 20 and the front cover 10 is smaller than the gap in the normal state. That is, the elastic element 32 is in a pre-compressed state in the normal state, and its restoring force continues to act on the pressure cap 20, so that the sealing surface of the pressure cap 20 is in close contact with the flow hole 211. Even if the battery pack on which the explosion-proof valve 100 is installed vibrates, the elastic element 32 can still absorb the vibration energy through deformation, which can avoid the instantaneous gap between the pressure cap 20 and the flow hole 211, and help improve the reliability of the explosion-proof valve 100. Furthermore, when the explosion-proof valve 100 is in its normal state, the elastic element 32 of the pressure cap 20 is in a pre-compressed state. Therefore, when the explosion-proof valve 100 is in the open state, the elastic element 32 will be in a compressed state. This allows the pressure cap 20 to move using the restoring force of the elastic element 32 when the air pressure inside the battery pack containing the explosion-proof valve 100 drops to a certain value. This eliminates the need for an additional power device (such as an electric mechanism) to reset the pressure cap 20, simplifying the structure of the explosion-proof valve 100 and helping to reduce its failure rate and production costs. As the pressure inside the battery pack containing the explosion-proof valve 100 decreases, the pressure acting on the elastic element 32 gradually decreases. The restoring force of the elastic element 32 will gradually move the pressure cap 20 away from the front cover 10 until the explosion-proof valve is in its normal state. During this process, the restoring force of the elastic element 32 gradually decreases as the compression decreases, making the reset process of the pressure cap 20 smooth and shock-free. This reduces collision wear between the pressure cap 20 and the flow hole 211, helping to extend the service life of the explosion-proof valve 100. Meanwhile, the explosion-proof valve 100 provided in this application has a simple structure and a small number of parts, which greatly reduces the production cost of parts and assembly costs, and helps to reduce the production cost of the explosion-proof valve 100 provided in this application.

[0063] Furthermore, a conventional explosion-proof valve 100 typically includes a valve body and a valve cover. The valve body is connected to the equipment enclosure (such as a battery enclosure) and mates with a mounting hole. A sealing ring or gasket is provided on the contact surface of the two, forming a sealing pair between the explosion-proof valve 100 and the equipment to block the flow of the internal medium of the equipment to the external environment. The valve cover is connected to the valve body, and a sealing structure is provided on the side of the valve cover facing the valve body. Under normal conditions, the valve cover presses against the sealing surface of the valve body, forming a sealing pair between the valve cover and the valve body inside the explosion-proof valve 100, used to achieve the sealing of the explosion-proof valve 100 itself. The probability of seal failure is positively correlated with the number of sealing pairs. Common explosion-proof valves 100 require two sealing pairs to simultaneously ensure sealing surface accuracy, uniform clamping force, and seal durability; failure in any one of these aspects will lead to overall seal failure. In this embodiment, the sealing pair between the valve cover and the valve body is eliminated, and only the sealing pair between the pressure cap 20 and the flow hole 211 is retained. This fundamentally reduces the number of sealing pairs. A reduction in the number of sealing pairs lowers the probability of seal failure and helps improve sealing reliability.

[0064] In this embodiment, the pre-compression of the elastic element 32 can be designed according to the sealing pressure requirements of the equipment. For example, if the sealing pressure is 0.1-0.5 MPa, the pre-compression of the elastic element 32 is set to 10%-30% of the free length of the elastic element 32.

[0065] Please refer to Figure 5 and Figure 6 , Figure 5 yes Figure 4 Exploded view of the explosion-proof valve in the image. Figure 6 yes Figure 4 A cross-sectional view of the explosion-proof valve in the image; such as Figure 5 and Figure 6 As shown, in some embodiments of this application, the explosion-proof valve 100 further includes a sealing element 40, which is connected to the pressure cap 20 and located between the pressure cap 20 and the flow hole 211. The sealing element 40 is configured to cooperate with the pressure cap 20 to seal the battery housing. Thus, the sealing element 40 can fill the gap between the pressure cap 20 and the flow hole 211, improving sealing reliability. Furthermore, the sealing element 40 can alleviate contact stress when the pressure cap 20 is pressed, reducing wear on the sealing surfaces of the pressure cap 20 and the flow hole 211, thereby extending the service life of the explosion-proof valve 100.

[0066] Furthermore, aging and wear of the seal 40 is a key factor affecting long-term sealing performance, therefore regular maintenance of the seal 40 is necessary. This application only has a sealing pair between the gland 20 and the housing flow hole 211, which is simple to maintain and low in cost, further reducing overall costs.

[0067] In some embodiments of this application, the seal 40 may be a sealing ring.

[0068] It is understood that the specific value of the gap between the pressure cap 20 and the front cover 10 of the explosion-proof valve 100 in this application embodiment can be designed according to the sealing pressure and pressure relief requirements, and this application does not limit it.

[0069] Please refer to Figure 4 and Figure 5 In some embodiments of this application, the explosion-proof valve 100 further includes a guide post 31. The guide post 31 and the elastic element 32 are disposed on the same side of the pressure cover 20. One end of the guide post 31 passes through the front cover 10 and is slidably connected to the front cover 10. The other end of the guide post 31 is fixedly connected to the pressure cover 20. The elastic element 32 is sleeved on the guide post 31 and the direction in which the elastic element 32 is compressed is the same as the sliding direction of the guide post 31 relative to the front cover 10.

[0070] In this embodiment, the guide post 31 is slidably connected to the front cover 10 and fixedly connected to the pressure cap 20, so that the pressure cap 20 can move axially along the guide post 31. This avoids the pressure cap 20 from shifting, tilting, or getting stuck during the movement, and ensures that the pressure cap 20 can accurately align with the flow hole 211 on the outer shell 210 when it changes from the open valve state (pressure cap 20 is close to the front cover 10) to the normal state. This avoids sealing failure or reset jamming due to displacement deviation, and helps to improve the reliability of the explosion-proof valve 100.

[0071] In some embodiments of this application, the elastic element 32 can be a spring, and when the explosion-proof valve 100 is in the normal state and the open state, the distance between the pressure cap 20 and the front cover 10 is less than the free length of the spring.

[0072] In some embodiments of this application, the front cover 10 has a connection hole, and the guide post 31 is slidably connected to the connection hole.

[0073] In some embodiments, a lubricating layer is provided on the outer surface of the guide post 31. This reduces sliding friction and improves the response rate of the pressure plate 20 of the explosion-proof valve 100.

[0074] In some embodiments of this application, the elastic element 32 can be replaced by a telescopic element, one end of which is connected to the front cover 10 and the other end of which is connected to the pressure cover 20.

[0075] In some embodiments of this application, the telescopic member includes an inner rod and an outer rod that are sleeved together. One end of the outer rod is fixedly connected to the front cover 10, and the end of the inner rod away from the outer rod is fixedly connected to the pressure cover 20. An elastic structure is provided between the inner rod and the outer rod. The elastic structure is configured to drive the inner rod to extend relative to the outer rod, so as to drive the pressure cover 20 from the open position to the sealed position in a direction away from the front cover 10. When the pressure cover 20 is in the sealed position, the length of the telescopic rod is less than its free extension length.

[0076] In this embodiment, the design of the elastic element 32 driving the inner rod to extend continuously provides a stable clamping force to the gland 20, ensuring that the gland 20 fits tightly with the mounting hole when in the sealed position. When sealed, the length of the telescopic rod is less than the free extension length, meaning the elastic element 32 is in a pre-compressed state, which can quickly respond to the reset requirement after pressure relief and prevent seal failure. Furthermore, the sleeve structure between the inner and outer rods defines the movement path of the gland 20, and the telescopic stroke can precisely match the displacement requirement of the gland 20 from sealing to opening. Simultaneously, by embedding the elastic element 32 inside the telescopic rod, there is no need for additional installation space for the elastic element 32, which reduces the overall number of components in the explosion-proof valve 100, making the structure of the explosion-proof valve 100 more compact and enabling the explosion-proof valve 100 provided in this application to adapt to flattened and miniaturized design requirements.

[0077] In some embodiments of this application, the front cover 10 is provided with a flow port 11.

[0078] This creates a complete airflow path for the explosion-proof valve 100: "flow hole 211 of battery pack 200 - chamber between pressure cap 20 and front cover 10 - flow port 11 of front cover 10". In the event of thermal runaway of the battery pack 200, the internal gas pushes the pressure cap 20 towards the front cover 10, allowing it to be directly and quickly discharged through the flow port 11. This significantly reduces airflow resistance and improves the pressure relief response speed, reducing the internal pressure of the battery pack 200 in a short time and helping to avoid the risk of deformation or explosion of the battery pack 200 casing due to continuous pressure accumulation. Furthermore, the flow port 11 can guide the airflow in a directional manner, reducing the residence time of high-temperature flue gas in the chamber between the pressure cap 20 and front cover 10, and lowering the probability of contact between viscous substances and solid particles in the flue gas and core components such as the elastic element 32 and guide post 31. Directional airflow also avoids the scouring and wear of components caused by disordered swirl, further reducing the formation of "particle-adhesive layer" on the surface of elastic element 32, ensuring the flexibility of elastic element 32 in extension and contraction, thereby reducing the risk of reset failure.

[0079] In some embodiments of this application, the front cover 10 has a protrusion in the direction away from the pressure cover 20, and the guide post 31 passes through the protrusion.

[0080] Thus, the front cover 10 naturally forms a reserved travel space for the pressure cap 20 to move towards the front cover 10. When the explosion-proof valve 100 is in the open state, the pressure cap 20 can move smoothly along the guide post 31 to the protruding side without the need for additional slots in the outer shell 210 or the housing of the battery pack 200 to accommodate the movement of the pressure cap 20. This design avoids the structural strength reduction caused by slotting the housing—slotting reduces the stress area of ​​the housing, making it prone to cracking due to vibration and pressure impact after long-term use. At the same time, it eliminates the problem of dust, sticky residues and other impurities accumulating in the groove, reducing the risk of impurities affecting the movement or sealing effect of the pressure cap, and also simplifies the processing technology of the outer shell 210 of the battery pack 200. The guide post 31 passes through the protrusion, making the protruding structure an extension support section of the guide post 31, extending the effective support length of the guide post 31. This design further enhances the installation stability of the guide post 31, preventing radial wobbling during the movement of the gland 20. It also precisely constrains the movement trajectory of the gland 20, ensuring it always moves axially along the guide post 31 without shifting or tilting due to increased stroke. This guarantees the alignment accuracy between the sealing surface of the gland 20 and the flow port 211, thereby improving sealing reliability. Furthermore, the protruding structure extends in the same direction as the guide post 31, preventing it from obstructing the flow port 11 of the front cover 10 or hindering airflow from exiting through the port 11. This avoids flow channel obstruction caused by the stroke space design, ensuring efficient pressure relief. Furthermore, the protruding structure is integrally formed with the front cover 10, resulting in stronger overall structure. This can disperse the force transmitted by the guide post 31 and the impact force of airflow during depressurization, preventing stress concentration in the front cover 10 at the installation position of the guide post 31, extending the service life of the front cover 10. At the same time, it forms circumferential protection for the guide post 31 that passes through it, reducing the probability of external impurities and moisture directly contacting the sliding surface of the guide post 31, and reducing the risk of the guide post 31 getting stuck due to wear or adhesion of "particle-adhesive layer".

[0081] In some embodiments of this application, the area enclosed by the edge of the front cover 10 is larger than the area enclosed by the edge of the pressure cover 20.

[0082] In this embodiment, the area enclosed by the edge of the front cover 10 is larger than that of the pressure cover 20. After installation, it can completely cover the pressure cover 20 and the area of ​​the flow hole 211 of the battery pack 200, forming a protective structure similar to a "shield". This structure can effectively prevent dust, mud, water vapor and other impurities in the external environment from directly contacting the sealing surface of the pressure cover 20, avoiding contamination or wear of the sealing surface, and ensuring the sealing reliability between the pressure cover 20 and the flow hole 211. At the same time, impurities cannot easily enter the cavity between the pressure cover 20 and the front cover 10, reducing the risk of contamination of the internal elastic element 32 and guide post 31, and further reducing the probability of jamming failure caused by the "particle-sticky layer". Moreover, the front cover 10 has a larger area, and its flow port 11 can be set in a wider area, or the exhaust airflow can be guided to diffuse in all directions by the shielding of the edge of the front cover 10. This can prevent the exhaust high temperature and high pressure gas from concentrating and impacting other components in the energy storage cabinet, reducing the thermal damage or mechanical impact of the airflow on the surrounding structure. At the same time, the diffused airflow can quickly mix with the ambient air and cool down, reducing the secondary risks caused by the local accumulation of high temperature gas. In addition, it can make the connection area between the front cover 10 and the outer shell 210 of the battery pack 200 wider, the installation and fixation more stable, and the impact resistance stronger, further improving the adaptability and service life of the explosion-proof valve 100 under complex working conditions.

[0083] Please continue to refer to this. Figures 4 to 6 In some embodiments of this application, the front cover 10 includes a first connecting part 12, a second connecting part 13 and a connecting arm 14. The connecting arm 14 connects the first connecting part 12 and the second connecting part 13. The first connecting part 12, the second connecting part 13 and the connecting arm 14 are located in the same plane. The first connecting part 12, the second connecting part 13 and the connecting arm 14 enclose to form a flow port 11.

[0084] In this embodiment, the first connecting part 12, the second connecting part 13, and the connecting arm 14 are located in the same plane, meaning the front cover 10 has a flat planar structure without any three-dimensional protrusions. This flat planar structure has a small thickness, allowing it to be directly embedded into narrow spaces such as thin-walled cavities and interlayers of equipment. Compared to the three-dimensional front cover 10, it requires less space for installation and can accommodate the integration needs of various compact devices. Furthermore, the planar structure is not dependent on a specific installation posture (horizontal, vertical, or inverted are all acceptable), and can adapt to the installation layout requirements of various devices. Therefore, placing the first connecting part 12, the second connecting part 13, and the connecting arm 14 in the same plane helps improve the universal compatibility of the explosion-proof valve 100. Simultaneously, the first connecting part 12, the second connecting part 13, and the connecting arm 14 being in the same plane allows them to be integrally molded, for example, through one-time molding processes such as stamping or injection molding. Compared to the multi-part welding and assembly of the three-dimensional front cover 10, this results in higher production efficiency, lower cost, and better structural consistency, effectively reducing the difficulty of quality control in mass production. Furthermore, the first connecting part 12, the second connecting part 13, and the connecting arm 14 enclose and form the flow port 11. The planar enclosed frame structure will distribute the force to the first connecting part 12, the second connecting part 13, and the connecting arm 14. Compared with a solid front cover 10 or a front cover 10 that is pieced together in pieces, the front cover 10 provided in this application has improved bending and torsional strength. It can withstand the fluid impact force during overpressure relief and the reaction force of the pre-compression force of the elastic element 32. It can avoid problems such as displacement of the pressure cap 20 and sealing failure caused by deformation of the front cover 10.

[0085] Please refer to Figure 6 , Figure 6 This is an exploded view of another explosion-proof valve provided in the embodiments of this application, such as... Figure 6 As shown, in some embodiments of this application, the front cover 10 includes a first connecting portion 12, a second connecting portion 13, and a connecting arm 14. In the stacking direction of the cover 20 and the front cover 10, the second connecting portion 13 is spaced apart from the first connecting portion 12, and the first connecting portion 12, the second connecting portion 13, and the connecting arm 14 enclose to form a flow port 11.

[0086] In this embodiment, the second connecting portion 13 and the first connecting portion 12 are spaced apart in the stacking direction of the pressure cap 20 and the front cover 10. That is, the front cover 10 has a layered structure. The layered design allows the effective flow cross-sectional area of ​​the flow port 11 to be expanded by increasing the stacking spacing of the connecting portions without increasing the radial dimension of the front cover 10, thereby adapting to the large flow pressure relief requirements. Moreover, the layered arrangement of the first connecting portion 12 and the second connecting portion 13 and the connecting arm 14 forms the flow port 11, so that the flow port 11 extends along the stacking direction. That is, the opening direction of the flow port 11 is consistent with the axial movement direction of the pressure cap 20. During the opening / resetting process of the pressure cap 20, the flow channel of the flow port 11 will not be blocked, which can ensure that the pressure relief is unobstructed throughout the process and effectively avoid the problem of secondary pressure accumulation inside the equipment due to flow channel blockage. Meanwhile, the first connecting part 12 and the second connecting part 13 are arranged in layers, and the connecting arm 14 achieves a rigid connection between the layers, forming a three-dimensional frame-type front cover 10. The reaction force of the pre-compressed elastic element 32 will be transmitted to the front cover 10 along the stacking direction. The layered design of the first connecting part 12 and the second connecting part 13 can offset the elastic force through double-layer support, thereby avoiding fatigue deformation of a single connecting part due to long-term bearing of pre-tightening force, ensuring the long-term stability of the pre-tightening force of the elastic element 32, and thus ensuring the consistency of sealing pressure. In addition, the force direction of the layered first connecting part 12 and the second connecting part 13 is consistent with the stacking direction. Therefore, regardless of whether the equipment with the explosion-proof valve 100 provided in this application is installed horizontally, vertically or inverted, the force transmission of the elastic element 32 is not affected by gravity, making the explosion-proof valve 100 provided in this application adaptable to the installation posture requirements of various equipment, which helps to expand the application scope of the explosion-proof valve 100.

[0087] In some embodiments of this application, the explosion-proof valve 100 has multiple elastic elements 32, which are evenly spaced along the circumference of the first connecting portion 12. This ensures that the reset / driving force exerted by the multiple elastic elements 32 on the pressure cap 20 is evenly distributed circumferentially, rather than concentrated locally. This avoids problems such as eccentric tilting, inadequate sealing surface fit, or localized wear of the pressure cap 20 due to uneven force distribution, ensuring consistent fit between the pressure cap 20 and the flow hole 211. Simultaneously, the pressure relief impact and reset reaction force are evenly transmitted to the first connecting portion 12 and the second connecting portion 13 via the equally spaced elastic elements 32 and the corresponding connecting arms 14. This further avoids localized stress concentration in the front cover 10, reduces the risk of fatigue failure such as bending and fracture, and improves structural durability. In addition, the circumferentially spaced multi-point guiding constraint can accurately limit the axial movement trajectory of the gland 20, preventing torsion and jamming, and does not obstruct the axial channel of the flow port 11, ensuring smooth pressure relief. Combined with the redundancy backup feature, it further improves the sealing, pressure relief reliability and service life of the explosion-proof valve 100.

[0088] It is understandable that when multiple elastic elements 32 are equally spaced along the circumference of the first connecting portion 12, the multiple elastic elements 32 can be disposed on the first connecting portion 12 or on multiple connecting arms 14.

[0089] Please refer to Figures 5 to 8 , Figure 7 This is an exploded view of another explosion-proof valve provided in the embodiments of this application. Figure 8 yes Figure 7 A cross-sectional view of the explosion-proof valve in the image, as shown below. Figures 5 to 8 As shown, in some embodiments of this application, the explosion-proof valve 100 has a plurality of elastic elements 32 and a plurality of connecting arms 14, and the plurality of elastic elements 32 and the plurality of connecting arms 14 are connected in a one-to-one correspondence.

[0090] This design ensures that each elastic element 32 is independently connected to a connecting arm 14, distributing the reset / driving force acting on the gland 20 to multiple stress points instead of concentrating it at a single location. This avoids problems such as localized deformation and sealing surface wear of the gland 20 due to single-point stress, ensuring consistent fit between the gland 20 and the sealing reference surface, and improving the reliability of the explosion-proof valve 100. Simultaneously, the reaction forces transmitted from the elastic element 32 to the front cover 10, such as the reaction force of the reset force and the impact force during depressurization, are evenly transmitted to the first connecting part 12 and the second connecting part 13 through the corresponding connecting arms 14. This prevents fatigue failure problems such as bending and breakage of the front cover 10 due to localized stress concentration, improving the structural durability of the gland 20 and the front cover 10, and thus extending the service life of the explosion-proof valve 100. In addition, multiple elastic elements 32 have redundant backup capabilities. Even if one elastic element 32 fails, the remaining elastic elements 32 can still work together to drive the pressure plate 20 to complete the opening / resetting action, which can ensure the sealing and pressure relief functions of the explosion-proof valve 100 and also help improve the reliability of the explosion-proof valve 100.

[0091] It should be noted that the core purpose of the "one-to-one connection between the elastic element 32 and the connecting arm 14" in the above embodiment is to ensure that the reset force of the elastic element 32 can be evenly transmitted to the first connecting part 12 / second connecting part 13 of the front cover 10 through the cooperation of the elastic element 32 and the connecting arm 14, while ensuring that the pressure cover 20 is subjected to balanced force in the circumference, and avoiding tilting of the pressure cover 20, sealing failure or reset jamming due to local force concentration. Therefore, the "one-to-one connection between the elastic element 32 and the connecting arm 14" is only one implementation method of this application, and not the only way to achieve the above core purpose. Based on the same inventive concept, as long as the force of the elastic element 32 can be evenly distributed in the circumference of the pressure cover 20 and the force transmission is stable, any equivalent cooperation relationship is within the protection scope of this application.

[0092] For example, the number of elastic elements 32 is less than the number of connecting arms 14. For instance, three elastic elements 32 and six connecting arms 14 are provided, with one connecting arm 14 between two adjacent elastic elements 32.

[0093] In some embodiments of this application, a plurality of elastic members 32 are equally spaced along the circumference of the first connecting portion 12 or the second connecting portion 13.

[0094] With this design, the driving / resetting forces of each elastic element 32 are symmetrically distributed along the closed contour of the first connecting part 12 or the second connecting part 13. The center of the resultant force coincides with the center of the connection between the first connecting part 12 / the second connecting part 13. The pressure on the cover 20 is free from local overload, and the sealing surface of the cover 20 is evenly pressured against the flow hole 211, preventing sealing failure due to uneven force. Furthermore, the reaction force borne by the front cover 10 is also symmetrically distributed, with no local stress concentration, which helps improve the durability of the explosion-proof valve 100. Simultaneously, the symmetrical constraint ensures that the movement speed and displacement of each part of the cover 20 are completely synchronized, allowing only translational movement along a preset direction without tilting or twisting. Moreover, the symmetrical layout allows the eccentric force to be quickly offset even under instantaneous off-center load impact, maintaining movement stability and making the opening / resetting actions precise and controllable, thus improving the reliability of the explosion-proof valve 100. In addition, multiple elastic elements 32 are arranged at equal intervals around the circumference, that is, the corresponding connecting arms 14 are also arranged at equal intervals in a synchronous and symmetrical manner. This makes the flow port 11 formed by the first connecting part 12, the second connecting part 13 and the connecting arm 14 symmetrically and evenly distributed, so that the fluid in the equipment where the explosion-proof valve 100 is installed can be evenly discharged along the evenly distributed flow port 11 without problems such as local turbulence or narrow flow channels, which helps to reduce flow resistance and improve pressure relief efficiency.

[0095] Please continue to refer to this. Figures 5 to 8 In some embodiments of this application, both the second connecting portion 13 and the connecting arm 14 are connected to elastic members 32.

[0096] In some embodiments of this application, the elastic element 32 connects the second connecting portion 13 and the pressure cap 20, and the elastic element 32 is connected to the central region of the second connecting portion 13. This makes the force transmission path "center of second connecting portion 13 - elastic element 32 - pressure cap 20", with the driving force / resetting force of the elastic element 32 directly transmitted from the center of the second connecting portion 13 to the pressure cap 20. This minimizes the force flow path, eliminates additional force transmission losses, and efficiently drives the pressure cap 20 to complete the opening / resetting action. Simultaneously, the connection of the elastic element 32 to the central region of the pressure cap 20 maximizes the release of the flow ports 11 in the peripheral region of the second connecting portion 13. Furthermore, the central region of the second connecting portion 13 is typically a region with high structural rigidity. When it concentrates the reaction force of the elastic element 32, the stress can quickly and evenly diffuse to the periphery, avoiding structural fatigue, deformation, or fracture caused by localized stress concentration. This extends the service life of the second connecting portion 13, thereby extending the service life of the explosion-proof valve 100.

[0097] As mentioned above, the fluid discharge path of the explosion-proof valve 100 provided in this application is "equipment interior - flow port 11 - outside". Considering that the flow port 11 is formed by the first connecting part 12, the second connecting part 13, and the connecting arm 14, it can be seen that the effective flow area of ​​the explosion-proof valve 100 is usually located in the peripheral area of ​​the second connecting part 13. Therefore, when the fluid inside the equipment where the explosion-proof valve 100 is installed is discharged from the flow port 11, it will diffuse outward along the peripheral channel of the flow port 11, with the main flow direction being outward away from the periphery of the second connecting part 13. As mentioned above, fluid impact or contact with the elastic element 32 is the core cause of the difficulty in resetting the elastic element 32 (such as increased friction due to impurity adhesion, jamming due to fluid corrosion, and deviation of the movement trajectory due to impact deformation). Therefore, when the elastic element 32 is connected to the central area of ​​the second connection part 13, the elastic element 32 is in the blind zone of the mainstream fluid path, so that the elastic element 32 will not be directly washed by the high-speed flowing fluid, avoiding wear, deformation or impurity adhesion of the elastic element 32 caused by fluid impact, which helps to improve the reliability of the explosion-proof valve 100 and extend the service life of the explosion-proof valve 100.

[0098] In some embodiments of this application, in the stacking direction of the cover 20 and the front cover 10, the projection of the second connecting portion 13 is smaller than the projection of the cover 20.

[0099] When the explosion-proof valve 100 is opened, the gas inside the equipment where the explosion-proof valve 100 is installed flows out from the mounting hole and directly impacts the pressure cap 20. It then discharges to the outside along the gaps around the pressure cap 20, with its main flow path being outward from the edge of the pressure cap 20. In this embodiment, the projection of the second connecting part 13 is smaller than the projection of the pressure cap 20, ensuring that the overall outline of the second connecting part 13 does not exceed the peripheral boundary of the pressure cap 20 and remains completely within the shielding range of the pressure cap 20. Therefore, the discharged gas will not directly scour the surface of the second connecting part 13. This avoids the continuous impact of high-speed airflow on the second connecting part 13, effectively preventing wear, deformation, or fatigue cracking of the second connecting part 13 due to airflow scouring. Simultaneously, if the discharged gas is corrosive, it also prevents the second connecting part 13 from being corroded. Furthermore, if the discharged gas is high-temperature gas, it also avoids problems such as reduced structural strength of the second connecting part 13 due to high-temperature baking, extending the service life of the front cover 10, which in turn helps extend the service life of the explosion-proof valve 100. Furthermore, if the projection of the second connecting portion 13 is larger than that of the pressure cap 20, the portion of the second connecting portion 13 extending beyond the pressure cap 20 will obstruct the flow of gas, causing turbulence and eddies during gas flow, increasing flow resistance, and reducing the pressure relief rate. Therefore, in this embodiment, the projection of the second connecting portion 13 is smaller than the projection of the pressure cap 20, so that the second connecting portion 13 is completely covered by the projection of the pressure cap 20. Gas can then be smoothly discharged along the edge of the pressure cap 20, allowing the pressure inside the equipment with the explosion-proof valve 100 to drop rapidly. This effectively solves the problem of incomplete pressure relief caused by flow obstruction, ultimately improving pressure relief efficiency.

[0100] Please continue to refer to this. Figures 5 to 8 In some embodiments of this application, the first connecting portion 12 is a ring-shaped structure.

[0101] This design allows the force acting on the first connecting part 12 to be uniformly transmitted along the annular structure 360° without stress breaks. Therefore, when the explosion-proof valve 100 is subjected to fluid pressure, installation warning force, or vibration load, the stress can be quickly diffused throughout the entire annular structure, avoiding local stress concentration. Compared to other types of front covers 10 (such as split front covers), the first connecting part 12 of the annular structure forms a surrounding support, with the support points covering more of the area around the mounting hole, resulting in more balanced force distribution and effectively preventing cracking at the edge of the mounting hole due to excessive local stress.

[0102] For example, the ring structure can be a complete closed loop, such as a circular ring, an elliptical ring / racetrack ring, a rectangular ring, or a regular polygonal closed loop. The ring structure can also be a non-complete closed loop but circumferentially continuous type, such as a ring composed of circular arc segments or a ring structure with a notch.

[0103] Please continue to refer to this. Figure 3 and Figure 4In some embodiments of this application, the pressure cap 20 has a vent hole 21, which is covered by a breathable membrane 22. The breathable membrane 22 allows for bidirectional gas flow. Therefore, by opening a vent hole 21 on the pressure cap 20 and covering it with a breathable membrane 22, the breathable membrane 22 can automatically adjust the slight pressure difference between the inside of the equipment where the explosion-proof valve 100 is installed and the outside, thereby avoiding the accumulation of pressure difference due to temperature difference and trace gas production. This helps to prevent problems such as unbalanced force on the pressure cap 20 and gaps in the sealing surface, and helps to maintain and improve the reliability of the explosion-proof valve 100.

[0104] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An explosion-proof valve, characterized in that, include: Front cover; A pressure cap, spaced apart from the front cover, the pressure cap having a sealing surface for sealing the flow passage; An elastic element is disposed on the side of the gland facing away from the sealing surface and is connected between the front cover and the gland; When the explosion-proof valve is in the normal state, the elastic element is compressed in the spacing direction between the gland and the front cover; when the explosion-proof valve is in the open state, the elastic element is further compressed compared to the normal state and the spacing distance between the gland and the front cover is smaller than the spacing distance in the normal state.

2. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve also includes a guide post, the guide post and the elastic element are disposed on the same side of the pressure cover, one end of the guide post passes through the front cover and is slidably connected to the front cover, the other end of the guide post is fixedly connected to the pressure cover, the elastic element is sleeved on the guide post and the direction in which the elastic element is compressed is the same as the sliding direction of the guide post relative to the front cover.

3. The explosion-proof valve according to claim 2, characterized in that, The front cover is provided with a flow port.

4. The explosion-proof valve according to claim 2 or 3, characterized in that, The front cover has a protrusion in the direction opposite to the pressure cap, and the guide post passes through the protrusion.

5. The explosion-proof valve according to claim 1, characterized in that, The area enclosed by the edges of the front cover is larger than the area enclosed by the edges of the pressure cover.

6. The explosion-proof valve according to any one of claims 2 to 5, characterized in that, The front cover includes a first connecting part, a second connecting part, and a connecting arm. The connecting arm connects the first connecting part and the second connecting part. The first connecting part, the second connecting part, and the connecting arm are located in the same plane. The first connecting part, the second connecting part, and the connecting arm enclose and form the flow port.

7. The explosion-proof valve according to any one of claims 2 to 5, characterized in that, The front cover includes a first connecting portion, a second connecting portion, and a connecting arm. In the direction of the interval between the pressure cap and the front cover, the second connecting portion is spaced apart from the first connecting portion, and the first connecting portion, the second connecting portion, and the connecting arm together form the flow port.

8. The explosion-proof valve according to claim 6 or 7, characterized in that, The explosion-proof valve has a plurality of elastic elements, which are arranged at equal intervals along the circumference of the first connecting portion.

9. The explosion-proof valve according to claim 6 or 7, characterized in that, The explosion-proof valve has multiple elastic elements and multiple connecting arms, and the multiple elastic elements and multiple connecting arms are connected in a one-to-one correspondence.

10. The explosion-proof valve according to any one of claims 6 to 9, characterized in that, The elastic element connects the second connecting portion and the pressure cap, and the elastic element is connected to the central region of the second connecting portion.

11. The explosion-proof valve according to any one of claims 6 to 10, characterized in that, In the stacking direction of the pressure cap and the front cover, the projection of the second connecting portion is smaller than the projection of the pressure cap.

12. The explosion-proof valve according to any one of claims 6 to 11, characterized in that, The first connecting part is a ring-shaped structure.

13. The explosion-proof valve according to any one of claims 1 to 12, characterized in that, The pressure cap has vent holes, and the vent holes are covered with a breathable membrane.

14. A battery pack, characterized in that, The device includes a housing and an explosion-proof valve as described in any one of claims 1 to 13, the housing being used to house one or more battery cells, the housing having the flow passage, the front cover being fixedly connected to the housing, and the pressure cap covering the flow passage.

15. An energy storage cabinet, characterized in that, The energy storage cabinet has multiple battery packs stacked inside as described in claim 14.

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