Pressure relief mechanism, case, battery, and electric device

Abstract

A pressure relief mechanism (10), a box (20), a battery (100) and an electric device. The pressure relief mechanism (10) comprises: a valve body (11) provided with a pressure relief port (111); a valve cover (12) covering the pressure relief port (111), the valve cover (12) is configured to move away from the valve body (11) under pressure to switch from a closed state to a pressure relief state; an airflow blocker (13) is arranged around the pressure relief port (111) and connected to the valve body (11) and the valve cover (12); when the valve cover (12) switches to the pressure relief state, the area around the pressure relief port (111) which is not blocked by the airflow blocker (13) forms an exhaust port (14) in communication with the outside. The guiding effect of the airflow blocker (13) can reduce the risk of high-temperature gas discharged through the pressure relief structure (10) spraying to the wire harness and other vulnerable components around the pressure relief mechanism (10), and improve the safety performance of the battery (100).

Description

Technical Field

[0001] This application relates to the field of safety device technology, and more specifically, to a pressure relief mechanism, a housing, a battery, and an electrical device. Background Technology

[0002] In related technologies, many sealed containers or equipment that bear a certain pressure (such as battery boxes, reaction vessels, gas storage tanks, etc.) usually need to be equipped with pressure relief mechanisms to prevent damage or safety accidents caused by excessive internal pressure.

[0003] Improving the safety of pressure relief mechanisms is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a pressure relief mechanism, a housing, a battery, and an electrical device, which can effectively improve its safety.

[0005] In a first aspect, this application provides a pressure relief mechanism, comprising: a valve body having a pressure relief port; a valve cover covering the pressure relief port, the valve cover being configured to move away from the valve body under pressure to switch from a closed state to a pressure relief state; and an airflow blocking member disposed around the pressure relief port and connected to the valve body and the valve cover; wherein, when the valve cover switches to the pressure relief state, the area around the pressure relief port not blocked by the airflow blocking member forms an exhaust port communicating with the outside.

[0006] In this technical solution, an airflow obstruction component is installed between the valve body and the valve cover. When the valve cover switches to the pressure relief state, the airflow obstruction component blocks a portion of the area surrounding the pressure relief port. High-temperature gas is discharged through the area around the pressure relief port that is not blocked by the airflow obstruction component, thereby achieving directional discharge of high-temperature gas. This effectively reduces the risk of pressure relief emissions scattering and damaging other external structural components of the pressure relief mechanism, thus effectively improving the safety of the pressure relief mechanism. When this pressure relief mechanism is applied to a battery, when thermal runaway occurs, the high-temperature, high-pressure gas generated inside the battery can be discharged through this pressure relief mechanism. This pressure relief mechanism can effectively prevent a portion of the high-temperature gas discharged from the pressure relief mechanism from directly spraying onto the vehicle wiring harness and other vulnerable parts on the battery casing, ensuring that the vehicle's safety performance is not affected by the diffusion of high-temperature gas around the pressure relief mechanism, thus effectively protecting the battery's safety. In addition, the airflow obstruction component is integrated into and located inside the pressure relief mechanism, avoiding the airflow obstruction component occupying external space of the pressure relief mechanism, thereby reducing the space occupancy rate of the airflow obstruction component and improving the overall space utilization rate of the battery.

[0007] According to some embodiments of this application, the airflow obstruction is only provided around a portion of the pressure relief port, and the area around the pressure relief port where no airflow obstruction is provided forms an exhaust port.

[0008] In the above technical solution, the airflow obstruction component is only disposed around a portion of the pressure relief port, forming a semi-enclosed structure around the pressure relief port. The area around the pressure relief port not surrounded by the airflow obstruction component directly forms an exhaust port. The airflow obstruction component has a simple structure, which helps to minimize the area of ​​the airflow obstruction component impacted by high-temperature gas, thereby improving the connection and structural stability of the airflow obstruction component. This also improves the reliability of the airflow obstruction component in guiding high-temperature gas, effectively enhancing the safety of the battery using this pressure relief mechanism. Simultaneously, since the airflow obstruction component does not completely surround the pressure relief port, it effectively ensures the smooth flow of pressure relief while serving as a pressure relief guide, reducing the risk of safety problems caused by poor pressure relief, further improving the safety of the pressure relief mechanism, and contributing to the safety of the battery using this pressure relief mechanism.

[0009] According to some embodiments of this application, the airflow blocking member is an arc-shaped structure extending circumferentially along the pressure relief port.

[0010] In the above technical solution, the airflow blocking component is an arc-shaped mechanism extending circumferentially along the pressure relief port. When high-temperature gas rushes towards the airflow blocking component, at least part of the airflow can swirl along the inner surface of the arc-shaped airflow blocking component, and then flow along the inner surface of the arc-shaped airflow blocking component until it is discharged through the exhaust port. The arc-shaped airflow blocking component can better guide the airflow, thereby effectively reducing the risk of the airflow turbulence between the various inner surfaces of the airflow blocking component after it hits the inner surface of the airflow blocking component, so that the airflow can be discharged through the exhaust port in a timely and rapid manner, thereby effectively improving the pressure relief smoothness of the pressure relief mechanism, improving the safety of the pressure relief mechanism, and helping to ensure the safety of the battery using the pressure relief mechanism.

[0011] According to some embodiments of this application, the angle at which the airflow blocking member extends circumferentially along the pressure relief port is α, satisfying 120°≤α≤240°.

[0012] In the aforementioned technical solutions, if the angle of the airflow obstruction extending circumferentially along the pressure relief port is too small, it cannot effectively guide the airflow, and the airflow easily bypasses the obstruction and disperses out of the pressure relief port of the pressure relief mechanism. If the angle of the airflow obstruction extending circumferentially along the pressure relief port is too large, it will result in an excessively small exhaust port, thus affecting the smoothness and timeliness of the pressure relief mechanism. Furthermore, the stagnant high-pressure airflow is prone to impacting the airflow obstruction, causing deformation or damage, which can easily lead to directional pressure relief failure. At the same time, poor battery pressure relief increases the risk of battery explosion, seriously affecting battery safety. The technical solution of this application designs the angle of the airflow obstruction extending circumferentially along the pressure relief port to be between 120° and 240°, which can effectively improve the stability of its directional pressure relief function while taking into account the smoothness and timeliness of the pressure relief mechanism, thereby improving the safety of the pressure relief mechanism in multiple ways.

[0013] According to some embodiments of this application, one end of the airflow blocking member is connected to the valve cover, and the airflow blocking member is configured to expand or retract under the action of the valve cover.

[0014] In the above technical solution, one end of the airflow blocking component is connected to the valve cover. When the valve cover switches to the pressure relief state, the valve cover moves away from the valve body, and the airflow blocking component unfolds to form a shielding area between the valve cover and the valve body. The high-temperature gas discharged through the pressure relief port can only exit the pressure relief mechanism through the area not blocked by the airflow blocking component, thereby effectively limiting the high-temperature gas from scattering out through the pressure relief port. When the valve cover returns to the closed state, the airflow blocking component retracts under the action of the valve cover, without affecting the sealing between the valve cover and the valve body. The airflow blocking component undergoes structural or positional changes synchronously with the pressure relief and reset of the valve cover, improving the timeliness and reliability of guiding high-temperature gas without affecting the normal pressure relief function of the pressure relief mechanism, further improving the safety of the pressure relief mechanism, and effectively ensuring the safety of the battery using this pressure relief mechanism.

[0015] According to some embodiments of this application, the airflow blocking member is a self-expanding structure, and the other end of the airflow blocking member is fixedly connected to the valve body.

[0016] In the above technical solution, the airflow blocking component is a self-expanding structure, with one end connected to the valve cover and the other end connected to the valve body. When the valve cover moves away from the valve body, the airflow blocking component unfolds under tension between the valve body and the valve cover to guide the high-temperature gas. When the valve cover returns to its original position towards the valve body, the airflow blocking component contracts and returns to its original position under pressure, avoiding positional interference with the valve cover's return. This effectively ensures the pressure relief and sealing functions of the pressure relief mechanism, improves the safety of the pressure relief mechanism, and thus effectively improves the safety of the battery using this pressure relief mechanism.

[0017] According to some embodiments of this application, the airflow blocking component includes a first sub-component and a second sub-component, which are slidably connected along the moving direction of the valve cover. The first sub-component is connected to the valve cover, and the second sub-component is connected to the valve body.

[0018] In the above technical solution, the first and second sub-components are slidably connected along the moving direction of the valve cover, forming a self-extending structure. When the valve cover switches to pressure relief mode, the first sub-component moves and unfolds opposite to the second sub-component. When the valve cover resets, the first sub-component moves toward the second sub-component to retract the airflow blocking component. The slidably connected structure of the first and second sub-components facilitates unfolding and retraction, and they guide each other, resulting in strong reliability and controllability of movement. This effectively improves the repeated service life of the airflow blocking component, thereby enhancing the structural stability and safety of the pressure relief mechanism and ensuring the safety of the battery using this pressure relief mechanism.

[0019] According to some embodiments of this application, both the first sub-component and the second sub-component are circumferentially non-closed sleeve structures, and the first sub-component and the second sub-component are slidably sleeved together.

[0020] In the above technical solution, both the first and second sub-components are circumferentially non-closed sleeve structures. The first and second sub-components mutually limit and guide each other, thus possessing high structural stability. Simultaneously, the circumferentially non-closed sleeve structure is positioned around the pressure relief port of the valve body, and the unclosed portions of the first and second sub-components form exhaust ports, providing a stable guiding effect for the high-temperature gas.

[0021] According to some embodiments of this application, the diameters of the first sub-component and the second sub-component gradually decrease along the direction from the valve cover to the valve body. The first sub-component is sleeved on the outer circumferential surface of the second sub-component. The diameter of the end of the first sub-component away from the valve cover is R1, and the diameter of the end of the second sub-component away from the valve body is R2, satisfying that R2 > R1.

[0022] In the above technical solution, both the first and second sub-components are conical cylindrical structures. The diameter of the end of the first sub-component furthest from the valve cover is smaller than the diameter of the end of the second sub-component furthest from the valve body. When the first and second sub-components slide out relative to each other, the inner circumferential surface of the end of the first sub-component furthest from the valve cover and the outer circumferential surface of the end of the second sub-component furthest from the valve body ultimately abut against each other, forming an interference fit. This allows the first and second sub-components to form a closed connection based on their own shapes after unfolding, thereby improving the airflow obstruction component's guiding reliability. Based on this design, the first and second sub-components can be in a clearance fit when in the retracted state or in a relative moving state, effectively reducing the sliding sealing requirements between the first and second sub-components. This reduces the resistance to the movement of the first sub-component relative to the second sub-component, effectively improving the smoothness of the unfolding or retraction of the first and second sub-components. Furthermore, this effectively reduces the possibility of the airflow obstruction component affecting the normal pressure relief and reset of the pressure relief mechanism, effectively ensuring the pressure relief safety of the pressure relief mechanism and ensuring the safety of the battery using this pressure relief mechanism.

[0023] According to some embodiments of this application, the diameters of the first sub-component and the second sub-component gradually increase along the direction from the valve cover to the valve body. The second sub-component is sleeved on the outer circumferential surface of the first sub-component. The diameter of the end of the first sub-component away from the valve cover is R1, and the diameter of the end of the second sub-component away from the valve body is R2, satisfying that R1 > R2.

[0024] In the above technical solution, both the first sub-component and the second sub-component are conical cylindrical structures. When the first sub-component and the second sub-component slide out relative to each other, the outer peripheral surface of the end of the first sub-component away from the valve cover and the inner peripheral surface of the end of the second sub-component away from the valve body finally abut against each other and form an interference fit. This allows the first sub-component and the second sub-component to form a closed connection based on their own shapes after unfolding, thereby improving the airflow blocking reliability of the airflow guiding component.

[0025] According to some embodiments of this application, the other end of the airflow blocking member is slidably connected to the valve body along the moving direction of the valve cover.

[0026] In the above technical solution, one end of the airflow blocking component is connected to the valve cover, and the other end is slidably connected to the valve body. The valve body supports and guides the airflow blocking component as it expands or contracts with the valve cover, effectively improving the stability of the airflow blocking component's expansion or contraction. Simultaneously, this design allows the airflow blocking component to adopt an integrated rigid structure, effectively improving its structural integrity and rigidity, as well as its sealing performance. This further enhances the guiding effect of the airflow blocking component on high-temperature, high-pressure gases, improves the pressure relief safety of the pressure relief mechanism, and enhances the safety of the battery using this pressure relief mechanism.

[0027] According to some embodiments of this application, the valve body is provided with a groove that extends through the valve body along the moving direction of the valve cover, and the other end of the airflow blocking member is slidably disposed in the groove.

[0028] In the above technical solution, a groove is provided on the valve body, and the airflow blocking component is slidably disposed within the groove, realizing a sliding connection between the airflow blocking component and the valve body. This design is simple, easy to assemble, and has a long service life. Simultaneously, the groove limits and guides the airflow blocking component, effectively improving its movement stability. By enhancing the structural stability of the pressure relief mechanism, the safety of the battery using this mechanism is effectively improved.

[0029] According to some embodiments of this application, the airflow blocking element does not extend beyond the edge of the valve cover along its radial direction.

[0030] In the above technical solution, the airflow blocking component does not extend beyond the edge of the valve cover and is positioned within the coverage area of ​​the valve cover, effectively avoiding the occupation of external space for the pressure relief mechanism. When this pressure relief mechanism is applied to a battery, it can effectively reduce the space occupancy rate of the pressure relief mechanism on the battery, thereby helping to improve the energy density of the battery using this pressure relief mechanism.

[0031] According to some embodiments of this application, the melting point of the airflow blocking element is higher than 500°C.

[0032] In the above technical solution, the melting point of the airflow blocking component is higher than 500℃, which can effectively improve the structural stability of the airflow blocking component under the impact of high temperature and high pressure airflow, reduce the risk of deformation or even damage of the airflow blocking component when it encounters high temperature gas impact during the pressure relief mechanism, and thus effectively improve the reliability of the airflow blocking component in guiding high temperature gas.

[0033] According to some embodiments of this application, the airflow blocking element is a metal part.

[0034] In the above technical solution, the airflow blocking component is a metal component, which has strong structural rigidity, is not easily deformed, and has outstanding high temperature resistance, effectively improving the performance reliability and service life of the airflow blocking component.

[0035] According to some embodiments of this application, the valve body has a guide hole, the valve cover includes a body and a guide shaft, the body covers the pressure relief port, one end of the guide shaft is connected to the body, and the other end of the guide shaft is slidably disposed in the guide hole.

[0036] In the above technical solution, the guide shaft of the valve cover is slidably disposed in the guide hole of the valve body, so that the valve body and the valve cover are movably connected. The setting of the guide shaft and the guide hole plays a guiding and limiting role for the valve cover, effectively improving the stability of the valve cover when switching between the pressure relief state and the closed state.

[0037] Secondly, this application provides a housing that is equipped with the pressure relief mechanism described in any of the above claims.

[0038] Thirdly, this application provides a battery, including: a housing as described above; and a battery cell housed within the housing.

[0039] Fourthly, this application provides an electrical device including a battery as described above, the battery being used to provide electrical energy. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0041] Figure 1 This application provides schematic diagrams of vehicle structures for some embodiments.

[0042] Figure 2 Exploded views of the battery structure provided for some embodiments of this application;

[0043] Figure 3 This is a front view of the structure of a pressure relief mechanism provided in some embodiments of this application;

[0044] Figure 4 Exploded views of the pressure relief mechanism provided in some embodiments of this application;

[0045] Figure 5 This is a schematic diagram of the pressure relief mechanism in a pressure relief state provided in some embodiments of this application;

[0046] Figure 6 A schematic diagram of the pressure relief mechanism in a closed state provided in some embodiments of this application;

[0047] Figure 7 for Figure 3 Right view of the valve body and airflow blocking component of the pressure relief mechanism shown;

[0048] Figure 8 This is a schematic diagram of the structure of an airflow blocking component provided in some embodiments of this application;

[0049] Figure 9 This is a schematic diagram of the structure of an airflow blocking member provided in some embodiments of this application;

[0050] Figure 10 A schematic diagram of the pressure relief mechanism in a pressure relief state provided in some embodiments of this application;

[0051] Figure 11 This is a schematic diagram of the pressure relief mechanism in a closed state provided in some embodiments of this application.

[0052] The accompanying drawings are not drawn to scale.

[0053] Marking Explanation: 1000-Vehicle; 100-Battery; 10-Pressure relief mechanism; 11-Valve body; 111-Pressure relief port; 112-Slide groove; 113-Guide hole; 114-Bottom wall; 115-Open end; 12-Valve cover; 121-Body; 122-Guide shaft; 13-Airflow blocking component; 131-First sub-component; 132-Second sub-component; 14-Exhaust port; 15-Spring; 16-Protective cover; 17-Seal; 20-Box; 21-First part; 22-Second part; 30-Battery cell; 200-Controller; 300-Motor. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0056] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0058] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0059] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0061] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a signal connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0063] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0064] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. The battery may include a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0065] Improving battery safety is a critical issue in battery technology. During use, batteries generate heat, causing the air inside the casing to expand due to the increased temperature. If this expansion isn't released in time, the pressure inside the casing will continuously rise, posing a risk of explosion. Therefore, a pressure relief mechanism needs to be installed on the battery casing to release pressure and prevent battery explosions.

[0066] A pressure relief mechanism generally includes a valve body, a valve cover, a seal, and an elastic element. The valve cover is connected to the valve body by the elastic element, and the valve cover and the valve body, as well as the valve body and the battery casing, are sealed by the seal. The valve cover is sealed to the valve body by the force of the elastic element. When the pressure inside the battery casing rises to a certain value, it will push the valve cover out of the sealed connection with the valve body and switch to the pressure relief state, thereby achieving pressure relief.

[0067] However, during the pressure relief process, the valve cover leaves the valve body opening, and high-temperature gas diffuses outwards along the opening on the valve body. The battery casing not only houses the pressure relief mechanism but also low-voltage and high-voltage wiring harnesses. Low-voltage harnesses include temperature or voltage sampling signal lines used for signal sampling, as well as wiring harnesses used for transmitting communication signals. High-voltage harnesses are used for transmitting high voltage and high current. Thus, some of the high-temperature gas diffusing from the pressure relief mechanism will directly spray onto the vehicle's wiring harnesses and other vulnerable parts such as connectors. These wiring harnesses and vulnerable parts are highly susceptible to damage under the influence of the high-temperature gas, thereby affecting the vehicle's safety performance.

[0068] In order to prevent the high-temperature gas diffused from the self-relief mechanism from damaging the vehicle wiring harness and other vulnerable parts, and thus to avoid affecting the vehicle's safety performance, those skilled in the art have found that a deflector can be installed on the outside of the pressure relief mechanism. The deflector guides the pressure relief direction of the pressure relief mechanism, so that the high-temperature gas is ejected from the pressure relief mechanism in a more directional manner, avoiding the wiring harness or components outside the battery, thereby improving the safety performance of the pressure relief mechanism.

[0069] However, the inventors of this application have discovered that even with a deflector covering the pressure relief mechanism, it is still impossible to effectively reduce the impact of pressure relief on battery safety.

[0070] The inventors of this application analyzed the cause and found that the shroud is generally a cover structure with an exhaust port on one side, usually installed on the battery box and covered by the pressure relief mechanism through threaded fastening or snap-fit ​​installation methods. When the pressure relief mechanism releases pressure, the high-temperature and high-pressure gas is discharged through the pressure relief mechanism and then blocked by the shroud, rushing into the inner cavity of the shroud and finally discharged through the exhaust port. During this process, the shroud is prone to deformation and displacement under the impact of the high-temperature and high-pressure gas, especially at the connection between the shroud and the box, which is prone to detachment, resulting in failure of directional exhaust. Its reliability is poor, which seriously affects the battery's service life and safety. If the shroud is fixed by fastening, it will cause certain installation damage to the battery box, which can easily affect the airtightness of the battery box and pose a significant safety hazard to the battery.

[0071] Based on the above reasons, the inventors of this application have designed a pressure relief mechanism after research. The pressure relief mechanism includes an airflow blocking component, which is disposed around the pressure relief port of the valve body and connected to the valve body and the valve cover. When the valve cover is switched to the pressure relief state, the area around the pressure relief port that is not blocked by the airflow blocking component forms an exhaust port that communicates with the outside.

[0072] In this technical solution, an airflow obstruction component is provided between the valve body and the valve cover. When the valve cover is switched to the pressure relief state, the airflow obstruction component blocks part of the area around the pressure relief port. High-temperature gas is discharged through the area around the pressure relief port that is not blocked by the airflow obstruction component, thereby achieving directional discharge of high-temperature gas. When this pressure relief mechanism is applied to a battery, it can effectively prevent part of the high-temperature gas discharged from the pressure relief mechanism from being directly sprayed onto the vehicle wiring harness and other vulnerable parts on the battery box, so that the vehicle's safety performance will not be affected by the diffusion of high-temperature gas around the pressure relief mechanism, effectively ensuring the safety of battery use.

[0073] Meanwhile, compared to structures that install a separate air guide outside the pressure relief mechanism, the airflow shielding component of this application is directly installed in the pressure relief mechanism and connected to the valve body and valve cover. The overall structure of the pressure relief mechanism has strong integration and stability, which can effectively reduce the risk of high-temperature gas breaking through the air guide's mounting position and causing positioning failure. This effectively improves the reliability of the airflow shielding component in guiding the pressure relief of the pressure relief mechanism, further improving the safety of the pressure relief mechanism and thus effectively ensuring the safety of the battery using this pressure relief mechanism. In addition, the airflow shielding component is connected to the valve body and valve cover, which can avoid secondary installation damage to the battery box and is conducive to improving the structural integrity, stability and airtightness of the battery box using this pressure relief mechanism, thereby further improving the battery's safety performance.

[0074] At the same time, it can avoid the airflow obstruction component occupying the external space of the pressure relief mechanism, thereby reducing the space occupancy rate of the airflow obstruction component, which in turn helps to improve the overall space utilization rate of the battery.

[0075] The pressure relief mechanism disclosed in this application can be applied to various sealed containers or equipment that bear a certain pressure and have pressure relief requirements, such as air compressors, oil-water separators, gas tanks, cooling tanks, and battery casings. The following embodiments illustrate the application of the pressure relief mechanism from some embodiments of this application to batteries.

[0076] The battery with a pressure relief mechanism disclosed in this application can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and this application does not limit it.

[0077] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using batteries disclosed in this application.

[0078] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0079] The batteries described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all electrical devices that use batteries. However, for the sake of brevity, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this application.

[0080] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0081] In some other embodiments, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0082] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of this application shows that the battery 100 may include a housing 20, a battery cell 30, and a pressure relief mechanism 10. The battery cell 30 is housed within the housing 20, and the pressure relief mechanism 10 is disposed on the housing 20. The pressure relief mechanism 10 can be opened to release pressure inside the housing 20. The housing 20 provides a receiving space for the battery cell 30, and the housing 20 may adopt various structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which overlap each other, and the first portion 21 and the second portion 22 together define a receiving space for accommodating the battery cell 30. The second part 22 can be a hollow structure with a pressure relief port at one end, and the first part 21 can be a plate-like structure. The first part 21 covers the pressure relief port side of the second part 22 so that the first part 21 and the second part 22 together define the accommodating space. Alternatively, the first part 21 and the second part 22 can both be hollow structures with a pressure relief port on one side, with the pressure relief port side of the first part 21 covering the pressure relief port side of the second part 22. Of course, the box 20 formed by the first part 21 and the second part 22 can be of various shapes, such as a cuboid, a cube, etc.

[0083] Please refer to Figures 3 to 6 , Figure 3 This is a front view of the structure of a pressure relief mechanism provided in some embodiments of this application; Figure 4 Exploded views of the pressure relief mechanism provided in some embodiments of this application; Figure 5 This is a schematic diagram of the pressure relief mechanism in a pressure relief state provided in some embodiments of this application; Figure 6This is a schematic diagram of the pressure relief mechanism in a closed state according to some embodiments of this application. Some embodiments of this application provide a pressure relief mechanism 10, which includes: a valve body 11, a valve cover 12, and an airflow blocking member 13. The valve body 11 is provided with a pressure relief port 111, and the valve cover 12 is closed on the pressure relief port 111. The valve cover 12 is configured to move away from the valve body 11 under pressure to switch from a closed state to a pressure relief state. The airflow blocking member 13 is disposed around the pressure relief port 111 and connected to the valve body 11 and the valve cover 12. When the valve cover 12 switches to the pressure relief state, the area around the pressure relief port 111 that is not blocked by the airflow blocking member 13 forms an exhaust port 14 communicating with the outside.

[0084] As previously described, the pressure relief mechanism 10 can be used to release the internal pressure of the battery housing 20. The pressure relief mechanism 10 includes a pressure-relieved state and a closed state. The valve body 11 is the main body of the pressure relief mechanism 10. The valve body 11 is used to be installed on the battery housing 20 of the battery 100. The pressure relief port 111 on the valve body 11 passes through the valve body 11 and can connect the interior of the housing 20 with the external environment of the housing 20.

[0085] The valve cover 12 is closed on the pressure relief port 111 of the valve body 11. The valve cover 12 can switch from a closed state to a pressure relief state under pressure. The valve cover 12 can close the pressure relief port 111 to achieve a closed state by relying on the force of the elastic element. In the closed state, the valve cover 12 is closed on the pressure relief port 111 of the valve body 11, and the pressure relief port 111 of the valve body 11 is isolated from the external environment, which can prevent the battery cell 30 from being affected by moisture, dust and other impurities in the external environment. In the pressure relief state, the valve cover 12 moves away from the valve body 11 (the moving direction X of the valve cover 12 is along the X direction shown in the figure) to leave the pressure relief port 111. The pressure relief port 111 is connected to the external environment, and the gas inside the casing 20 of the battery 100 is released to the external environment through the pressure relief port 111 to achieve the pressure relief of the battery 100.

[0086] like Figure 3 As shown, in order to make the valve body 11 and the housing 20 sealed together, a sealing element 17 can be provided between the outer periphery of the valve body 11 and the mounting hole of the housing 20 for installing the pressure relief mechanism, so that the valve body 11 and the housing 20 are sealed by the sealing element 17.

[0087] In some embodiments, a seal (not shown) may also be provided between the valve cover 12 and the valve body 11. When the valve cover 12 is closed on the pressure relief port 111, the valve cover 12 and the valve body 11 can be sealed by the seal.

[0088] like Figure 4 and Figure 5As shown, the valve body 11 can be a hollow structure with one end open. A pressure relief port 111 is located on the bottom wall 114 of the valve body 11, opposite to the open end 115 of the valve body 11, and communicating with the open end 115. When the pressure relief mechanism 10 is in the closed state, the valve cover 12 covers the open end 115 of the valve body 11 to seal the pressure relief port 111 of the valve body 11.

[0089] The airflow obstruction member 13 being positioned around the pressure relief port 111 means that the airflow obstruction member 13 is arranged around the pressure relief port 111. The airflow obstruction member 13 can form a closed-loop structure around the pressure relief port 111, and simultaneously, the airflow obstruction member 13 has a gap connecting the pressure relief port 111 to the external environment. This gap, not blocked by the airflow obstruction member 13, forms the exhaust port 14. Alternatively, the airflow obstruction member 13 can also form a non-closed-loop structure around the pressure relief port 111, with the area around the pressure relief port 111 where the airflow obstruction member 13 is not positioned forming the exhaust port 14.

[0090] It is understandable that the airflow blocking component 13 can have various implementation structures. For example, the airflow blocking component 13 can be a rigid structure, with one end fixedly connected to the valve body 11 and the other end slidably connected to the valve cover 12 along the moving direction X of the valve cover 12 (X direction shown in the figure). When the valve cover 12 moves away from the valve body 11 to release pressure, the part of the airflow blocking component 13 located between the valve body 11 and the valve cover 12 plays a guiding role for the high-temperature gas.

[0091] An airflow obstruction element 13 is provided between the valve body 11 and the valve cover 12. When the valve cover 12 is switched to the pressure relief state, the airflow obstruction element 13 blocks a portion of the area surrounding the pressure relief port 111. High-temperature gas is discharged from the pressure relief mechanism 10 through the exhaust port 14. The airflow obstruction element 13 guides the direction of the high-temperature gas discharged through the pressure relief port 111. Compared with the traditional method of high-temperature gas being discharged from the pressure relief mechanism 10 in a scattered manner around the pressure relief port 111, this embodiment can effectively prevent the high-temperature gas discharged through the pressure relief mechanism 10 from spraying onto the wiring harness or other vulnerable parts of the battery 100 located around the pressure relief mechanism 10, thereby reducing the risk of high-temperature gas damaging the components of the battery 100 and affecting the safety of the battery 100, and effectively improving the safety performance and service life of the battery 100.

[0092] In some embodiments, the airflow obstruction 13 is provided only around a portion of the pressure relief port 111, and the area around the pressure relief port 111 where the airflow obstruction 13 is not provided forms the exhaust port 14.

[0093] In other words, the airflow blocking member 13 is arranged in a non-closed loop around the pressure relief port 111, and an exhaust port 14 is formed between the two ends of the airflow blocking member 13 along the circumference of the pressure relief port 111.

[0094] The airflow obstruction member 13 is only disposed around a portion of the pressure relief port 111, forming a semi-enclosed structure around the pressure relief port 111. The portion of the pressure relief port 111 not surrounded by the airflow obstruction member 13 directly forms the exhaust port 14. The airflow obstruction member 13 has a simple structure, which helps to minimize the area of ​​the airflow obstruction member 13 impacted by high-temperature gas, thereby improving the connection stability and structural stability of the airflow obstruction member 13, and improving the reliability of the airflow obstruction member 13 in guiding high-temperature gas. At the same time, the airflow obstruction member 13 does not completely surround the pressure relief port 111. While playing a pressure relief guiding role, the airflow obstruction member 13 effectively ensures the smooth flow of pressure relief, thereby effectively guaranteeing the normal pressure relief function of the pressure relief mechanism 10.

[0095] In some embodiments, please continue to refer to Figures 3 to 6 and further refer to Figure 7 , Figure 7 for Figure 3 The right view of the valve body and airflow blocking component of the pressure relief mechanism shown. The airflow blocking component 13 is an arc-shaped structure extending circumferentially along the pressure relief port 111.

[0096] The airflow obstruction member 13 is an arc-shaped mechanism extending circumferentially along the pressure relief port 111. When high-temperature gas rushes towards the airflow obstruction member 13, at least part of the airflow can swirl along the inner surface of the arc-shaped airflow obstruction member 13, and then flow along the inner surface of the arc-shaped airflow obstruction member 13 until it is discharged through the exhaust port 14. The arc-shaped airflow obstruction member 13 can better guide the airflow, thereby effectively reducing the risk of the airflow turbulent between the inner surfaces of the airflow obstruction member 13 after hitting the inner surface of the airflow obstruction member 13, so that the airflow can be discharged through the exhaust port 14 in a timely and rapid manner, thereby effectively improving the pressure relief smoothness of the pressure relief mechanism 10.

[0097] In some embodiments, such as Figure 7 As shown, the angle of the airflow blocking component 13 extending circumferentially along the pressure relief port 111 is α, which satisfies 120°≤α≤240°.

[0098] Specifically, the angle α of the airflow blocking member 13 extending circumferentially along the pressure relief port 111 can be any angle greater than or equal to 120° and less than or equal to 240°. For example, α can be 120°, 130°, 140°, 150°, 160°, 180°, 200°, 220°, 240°, etc.

[0099] In some embodiments, α can be any angle greater than or equal to 180° and less than or equal to 240°. For example, α can be 180°, 190°, 200°, 210°, etc.

[0100] For example, α is 180°, that is, the airflow obstruction 13 is semi-circular.

[0101] If the angle at which the airflow obstruction 13 extends circumferentially along the pressure relief port 111 is too small, it cannot effectively guide the airflow, and the airflow will easily bypass the airflow obstruction 13 and disperse out of the pressure relief port 111 of the pressure relief mechanism 10. If the angle at which the airflow obstruction 13 extends circumferentially along the pressure relief port 111 is too large, it will cause the exhaust port 14 to be too small, thereby affecting the smoothness and timeliness of the pressure relief mechanism 10. Furthermore, the stagnant high-pressure airflow is likely to impact the airflow obstruction 13, causing it to deform or be damaged, which can easily lead to directional pressure relief failure. Moreover, poor pressure relief increases the risk of battery 100 explosion, seriously affecting the safety of battery 100. The technical solution of this application designs the angle at which the airflow obstruction 13 extends circumferentially along the pressure relief port 111 to be between 120° and 240°, which can effectively improve the stability of its directional pressure relief function while taking into account the smoothness and timeliness of the pressure relief mechanism 10, thereby improving the safety of battery 100 in many ways.

[0102] In some embodiments, one end of the airflow blocking member 13 is connected to the valve cover 12, and the airflow blocking member 13 is configured to expand or retract under the action of the valve cover 12.

[0103] Specifically, one end of the airflow blocking member 13 along the moving direction X of the valve cover 12 can be fixedly connected to the valve cover 12 by means of adhesive bonding, welding, snap-fitting, etc. When the valve cover 12 moves away from the valve body 11, the valve cover 12 drives the airflow blocking member 13 to unfold. When the valve cover 12 returns to its original position, the airflow blocking member 13 retracts under the action of the valve cover 12, so that the valve cover 12 can close on the pressure relief port 111 of the valve body 11.

[0104] Based on this, there are various implementation structures for the airflow blocking component 13. For example, the airflow blocking component 13 can be a self-extending structure, or the other end of the airflow blocking component 13 can be movably set away from the valve cover 12, etc.

[0105] When the valve cover 12 switches to the pressure relief state, the valve cover 12 moves away from the valve body 11, and the airflow blocking member 13 unfolds to form a blocking area between the valve cover 12 and the valve body 11. The high-temperature gas discharged through the pressure relief port 111 can only be discharged from the pressure relief mechanism 10 through the area not blocked by the airflow blocking member 13, thereby effectively limiting the high-temperature gas from being dispersed through the pressure relief port 111. When the valve cover 12 returns to the closed state, the airflow blocking member 13 retracts under the action of the valve cover 12, without affecting the sealing between the valve cover 12 and the valve body 11. The airflow blocking member 13 changes its structure or position synchronously with the pressure relief and reset of the valve cover 12, improving the timeliness and reliability of guiding high-temperature gas without affecting the normal pressure relief function of the pressure relief mechanism 10.

[0106] In some embodiments, the airflow blocking member 13 is a self-extending structure, and the other end of the airflow blocking member 13 is fixedly connected to the valve body 11.

[0107] Specifically, the two ends of the airflow blocking component 13 along the moving direction of the valve cover 12 are fixedly connected to the valve cover 12 and the valve body 11 by means of adhesive bonding, welding, snap-fitting, etc. The airflow blocking component 13 itself can extend and retract along the moving direction X of the valve cover 12.

[0108] Based on the above, the airflow blocking component 13 can be implemented in various forms. For example, the airflow blocking component 13 can be made of a material that can undergo elastic deformation, or the airflow blocking component 13 can be a structure that can be expanded and contracted by structural design, such as a structure similar to a bellows, etc.

[0109] The airflow blocking component 13 is a self-extending structure, with one end connected to the valve cover 12 and the other end connected to the valve body 11. When the valve cover 12 moves away from the valve body 11, the airflow blocking component 13 is stretched out under tension between the valve body 11 and the valve cover 12 to guide the high-temperature gas. When the valve cover 12 returns to its original position towards the valve body 11, the airflow blocking component 13 is compressed and retracted to its original position, thus avoiding positional interference with the repositioning of the valve cover 12.

[0110] In some embodiments, please refer again Figures 4 to 6 The airflow blocking component 13 includes a first sub-component 131 and a second sub-component 132. The first sub-component 131 and the second sub-component 132 are slidably connected along the moving direction X of the valve cover 12. The first sub-component 131 is connected to the valve cover 12, and the second sub-component 132 is connected to the valve body 11.

[0111] The airflow blocking member 13 includes a first sub-component 131 and a second sub-component 132 that are slidably connected along the moving direction X of the valve cover 12. When the valve cover 12 moves away from the valve body 11, the first sub-component 131 slides relative to the second sub-component 132, and the airflow blocking member 13 unfolds along the moving direction X of the valve cover 12. When the valve cover 12 moves away from the valve body 11, the first sub-component 131 slides in the opposite direction relative to the second sub-component 132, and the airflow blocking member 13 retracts along the moving direction X of the valve cover 12.

[0112] Based on the implementation of "the valve body 11 has a hollow structure with one end open, the pressure relief port 111 is set on the bottom wall 114 of the valve body 11, and the valve cover 12 covers the open end 115 of the valve body 11", the second sub-component 132 can be connected to the bottom wall 114 of the valve body 11, and the first sub-component 131 can be connected to the side of the valve cover 12 facing the pressure relief port 111. When the pressure relief mechanism 10 is in a closed state, the airflow blocking member 13 can be accommodated in the inner cavity of the valve body 11 to prevent the second sub-component 132 from interfering with the closure of the pressure relief mechanism 10.

[0113] Of course, in some other embodiments, the sidewalls of the valve body 11 surrounding the bottom wall 114 can also be directly formed as the second sub-component 132.

[0114] It is understood that the structures of the first sub-component 131 and the second sub-component 132 can be the same or different. The first sub-component 131 and the second sub-component 132 can both extend circumferentially along the pressure relief port 111 to form a closed loop structure. The first sub-component 131 or the second sub-component 132 can be provided with an exhaust port 14, or both the first sub-component 131 and the second sub-component 132 can be provided with an exhaust port 14.

[0115] Of course, the first sub-component 131 and the second sub-component 132 can also be arranged around a portion of the pressure relief port 111.

[0116] Alternatively, one of the first sub-component 131 and the second sub-component 132 extends circumferentially along the pressure relief port 111 to form a closed-loop structure, and the other extends circumferentially along the pressure relief port 111 to form a non-closed-loop structure, with the notch of the non-closed-loop structure forming the exhaust port 14.

[0117] The first sub-component 131 and the second sub-component 132 are slidably connected along the moving direction X of the valve cover 12, forming a self-extending structure. When the valve cover 12 switches to depressurization mode, the first sub-component 131 moves and unfolds opposite to the second sub-component 132. When the valve cover 12 is reset, the first sub-component 131 moves toward the second sub-component 132 to retract the airflow blocking component 13. The slidably connected structure of the first sub-component 131 and the second sub-component 132 facilitates unfolding and retraction, and they guide each other, resulting in high reliability and controllability of movement, effectively improving the repeated service life of the airflow blocking component 13.

[0118] In some embodiments, please refer again Figure 4 Both the first sub-component 131 and the second sub-component 132 are circumferential non-closed sleeve structures, and the first sub-component 131 and the second sub-component 132 are slidably sleeved together.

[0119] Specifically, the first sub-component 131 can be fitted around the outer periphery of the second sub-component 132, or the second sub-component 132 can be fitted around the outer periphery of the first sub-component 131.

[0120] The first sub-component 131 and the second sub-component 132 can both be straight cylindrical structures or both be conical cylindrical structures. Alternatively, one of the first sub-component 131 and the second sub-component 132 can be a straight cylindrical structure and the other can be a conical cylindrical structure.

[0121] The unclosed portions of the first sub-component 131 and the second sub-component 132 can be aligned with each other along the moving direction X of the valve cover 12 to form an exhaust port 14. Alternatively, the unclosed portions of the first sub-component 131 and the second sub-component 132 can be staggered along the moving direction X of the valve cover 12. After the first sub-component 131 and the second sub-component 132 are unfolded, two exhaust ports 14 are formed to guide and exhaust the high-temperature gas in two ways.

[0122] Both the first sub-component 131 and the second sub-component 132 are circumferentially non-closed sleeve structures. The first sub-component 131 and the second sub-component 132 mutually limit and guide each other, thus possessing high structural stability. At the same time, the circumferentially non-closed sleeve structure is arranged around the pressure relief port 111 of the valve body 11, and the unclosed portions of the first sub-component 131 and the second sub-component 132 form the exhaust port 14, which plays a stable guiding role for high-temperature gas.

[0123] In some embodiments, please continue to refer to Figures 4 to 7 and further refer to Figure 8 , Figure 8 This is a schematic diagram of the airflow blocking component provided in some embodiments of this application. The diameters of the first sub-component 131 and the second sub-component 132 gradually decrease along the direction from the valve cover 12 to the valve body 11. The first sub-component 131 is sleeved on the outer peripheral surface of the second sub-component 132. The diameter of the end of the first sub-component 131 away from the valve cover 12 is R1, and the diameter of the end of the second sub-component 132 away from the valve body 11 is R2, satisfying that R2 > R1.

[0124] In other words, both the first sub-component 131 and the second sub-component 132 are conical cylindrical structures, and the diameter of the end of the first sub-component 131 and the second sub-component 132 facing the valve cover 12 is larger than the diameter of the end facing the valve body 11. At the same time, the diameter of the end of the second sub-component 132 facing the valve cover 12 is larger than the diameter of the end of the first sub-component 131 facing the valve body 11.

[0125] When the first sub-component 131 and the second sub-component 132 slide out relative to each other, the inner circumferential surface of the end of the first sub-component 131 away from the valve cover 12 and the outer circumferential surface of the end of the second sub-component 132 away from the valve body 11 finally abut against each other in an interference fit. This allows the first sub-component 131 and the second sub-component 132 to form a closed connection based on their own shapes after unfolding, thereby improving the airflow guiding reliability of the airflow blocking component 13. Based on this design, the first sub-component 131 and the second sub-component 132 can be in a clearance fit when they are in the retracted state or in a relative moving state, effectively reducing the sliding sealing requirements between the first sub-component 131 and the second sub-component 132, thereby reducing the resistance to the movement of the first sub-component 131 relative to the second sub-component 132, thereby effectively improving the smoothness of the unfolding or retraction of the first sub-component 131 and the second sub-component 132, and thus effectively reducing the possibility that the airflow blocking component 13 will affect the normal pressure relief and reset of the pressure relief mechanism 10.

[0126] In some other embodiments, please refer to Figure 9 , Figure 9This is a schematic diagram of the airflow blocking component provided in some embodiments of this application. The diameters of the first sub-component 131 and the second sub-component 132 gradually increase along the direction from the valve cover 12 to the valve body 11. The second sub-component 132 is sleeved on the outer peripheral surface of the first sub-component 131. The diameter of the end of the first sub-component 131 away from the valve cover 12 is R1, and the diameter of the end of the second sub-component 132 away from the valve body 11 is R2, satisfying that R1 > R2.

[0127] In other words, both the first sub-component 131 and the second sub-component 132 are conical cylindrical structures, and the diameter of the end of the first sub-component 131 and the second sub-component 132 facing the valve cover 12 is smaller than the diameter of the end facing the valve body 11. At the same time, the diameter of the end of the second sub-component 132 facing the valve cover 12 is smaller than the diameter of the end of the first sub-component 131 facing the valve body 11.

[0128] When the first sub-component 131 and the second sub-component 132 slide out relative to each other, the outer peripheral surface of the end of the first sub-component 131 away from the valve cover 12 finally abuts against the inner peripheral surface of the end of the second sub-component 132 away from the valve body 11, so that the first sub-component 131 and the second sub-component 132 form a closed connection based on their own shape after unfolding, thereby improving the airflow guiding reliability of the airflow blocking component 13.

[0129] In some other embodiments, please refer to Figure 10 and Figure 11 , Figure 10 A schematic diagram of the pressure relief mechanism in a pressure relief state provided in some embodiments of this application; Figure 11 This is a schematic diagram of the pressure relief mechanism in a closed state provided in some embodiments of this application. The other end of the airflow blocking member 13 is slidably connected to the valve body 11 along the moving direction X of the valve cover 12.

[0130] Specifically, along the moving direction X of the valve cover 12, the end of the airflow blocking member 13 facing the valve cover 12 is connected to the valve cover 12 by means of adhesive, welding, snap-fit, etc., and the end of the airflow blocking member 13 away from the valve cover 12 is slidably connected to the valve body 11.

[0131] One end of the airflow blocking component 13 is connected to the valve cover 12, and the other end is slidably connected to the valve body 11. The valve body 11 supports and guides the airflow blocking component 13 as it expands or contracts with the valve cover 12, effectively improving the stability of the airflow blocking component 13 during expansion or contraction. Simultaneously, this design allows the airflow blocking component 13 to adopt an integrated rigid structure, effectively ensuring its structural integrity and rigidity, and also effectively improving its sealing performance.

[0132] The valve body 11 may be provided with a slide groove 112 that runs through the valve body 11 along the moving direction X of the valve cover 12, and the other end of the airflow blocking member 13 is slidably disposed in the slide groove 112.

[0133] It is understood that the groove 112 can be matched with the shape of one end of the airflow blocking member 13 away from the valve cover 12 so that the one end of the airflow blocking member 13 away from the valve cover 12 can be slidably inserted into the groove 112.

[0134] Based on the implementation of "the valve body 11 has a hollow structure with one end open, the pressure relief port 111 is set on the bottom wall 114 of the valve body 11, and the valve cover 12 covers the open end 115 of the valve body 11", the slide groove 112 can be set on the bottom wall 114 of the valve body 11 and penetrate through the bottom wall 114 of the valve body 11.

[0135] The airflow blocking component 13 is slidably disposed within the slide groove 112 to achieve a sliding connection between the airflow blocking component 13 and the valve body 11. The structure is simple, easy to assemble, and has a long service life. At the same time, the slide groove 112 limits and guides the airflow blocking component 13, effectively improving the movement stability of the airflow blocking component 13.

[0136] It is understood that the sliding connection between the airflow blocking member 13 and the valve body 11 can be implemented in various ways. In some other embodiments, the end of the airflow blocking member 13 facing away from the valve cover 12 can be inserted into the pressure relief port 111 and directly slide with the inner circumferential surface of the pressure relief port 111.

[0137] In some embodiments, the airflow blocking element 13 does not extend beyond the edge of the valve cover 12 along the radial direction of the valve cover 12.

[0138] Specifically, the valve cover 12 has a first surface facing the pressure relief port 111 of the valve body 11, and the projection of the airflow blocking member 13 falls onto the first surface along the moving direction X of the valve cover 12.

[0139] The airflow blocking element 13 does not extend beyond the edge of the valve cover 12 and is positioned within the coverage area of ​​the valve cover 12, effectively avoiding the occupation of external space of the pressure relief mechanism 10. When this pressure relief mechanism 10 is applied to the battery 100, it can effectively reduce the space occupancy rate of the pressure relief mechanism 10 on the battery 100, thereby helping to improve the energy density of the battery 100.

[0140] In some embodiments, the melting point of the airflow blocking element 13 is higher than 500°C.

[0141] Specifically, the melting point of the airflow blocking component 13 can be any value above 500°C, such as 550°C, 600°C, 700°C, or even higher.

[0142] The melting point of the airflow blocking component 13 is higher than 500℃, which can effectively improve the structural stability of the airflow blocking component 13 under the impact of high temperature and high pressure airflow, reduce the risk of deformation or even damage of the airflow blocking component 13 when it is subjected to high temperature gas impact when the pressure relief mechanism 10 is depressurized, and thus effectively improve the reliability of the airflow blocking component 13 in guiding high temperature gas.

[0143] In some embodiments, the airflow obstruction member 13 is a metal part.

[0144] For example, the airflow blocking component 13 may be made of materials such as iron, aluminum, aluminum alloy, or stainless steel.

[0145] The airflow blocking component 13 is a metal part with strong structural rigidity, is not easily deformed, and has outstanding high temperature resistance, which effectively improves the performance reliability and service life of the airflow blocking component 13.

[0146] In some embodiments, please refer again Figures 3 to 7 The valve body 11 has a guide hole 113. The valve cover 12 includes a body 121 and a guide shaft 122. The body 121 covers the pressure relief port 111. One end of the guide shaft 122 is connected to the body 121, and the other end of the guide shaft 122 is slidably disposed in the guide hole 113.

[0147] Specifically, the valve body 11 has a pressure relief port 111 and a guide hole 113. The pressure relief port 111 is used to connect the inside of the housing 20 with the outside of the housing 20, and the guide hole 113 is used to guide the movement of the valve cover 12. One end of the guide shaft 122 is connected to the body 121, and the other end is slidably inserted into the guide hole 113.

[0148] Based on the implementation where "the valve body 11 has a hollow structure with one end open, the pressure relief port 111 is located on the bottom wall 114 of the valve body 11, and the valve cover 12 covers the open end 115 of the valve body 11," the guide hole 113 can also be located on the bottom wall 114. For example... Figure 7 As shown, multiple pressure relief ports 111 can be provided, and the multiple pressure relief ports 111 can be distributed circumferentially around the guide hole 113.

[0149] In some embodiments, please continue to refer to Figures 4 to 6 The pressure relief mechanism 10 may also include a spring 15, which is sleeved on the guide shaft 122 and elastically supported between the guide shaft 122 and the valve body 11. The spring 15 is used to provide the force to close the valve cover 12 onto the pressure relief port 111 of the valve body 11. When the air pressure inside the housing 20 increases, the air pressure inside the housing 20 overcomes the elastic force of the spring 15 and pushes the valve cover 12 open, so that the pressure relief port 111 is connected to the outside. The gas inside the housing 20 is discharged through the exhaust port 14.

[0150] In some embodiments, please continue to refer to Figures 4 to 6 The pressure relief mechanism 10 may also include a protective cover 16, which may cover the outer periphery of the spring 15 and the guide shaft 122. The end of the protective cover 16 near the valve body 11 may be connected to the valve body 11. The protective cover 16 protects the guide shaft 122 and the spring 15.

[0151] The guide shaft 122 of the valve cover 12 is slidably inserted into the guide hole 113 of the valve body 11, so that the valve body 11 and the valve cover 12 are movably connected. The guide shaft 122 and the guide hole 113 play a guiding and limiting role for the valve cover 12, effectively improving the stability of the valve cover 12 when switching between the pressure relief state and the closed state.

[0152] This application provides a housing, which is equipped with the pressure relief mechanism 10 as described in any of the above embodiments.

[0153] It is understood that the enclosure 20 can be either an enclosure for encapsulating battery cells or a cavity of any of the aforementioned containers or devices that have pressure relief requirements.

[0154] This application provides a battery 100, which includes a housing 20 and a battery cell 30 as described in the above embodiments, with the battery cell 30 housed in the housing 20.

[0155] This application provides an electrical device including a battery 100 as described above, the battery 100 being used to provide electrical energy.

[0156] It is understood that the electrical device can be any of the aforementioned electrical devices.

[0157] Please refer to Figures 3 to 8 This application provides a pressure relief mechanism 10, which includes a valve body 11, a valve cover 12, and an airflow blocking member 13. The valve body 11 is provided with a pressure relief port 111 and a guide hole 113. The valve cover 12 includes a body 121 and a guide shaft 122. The body 121 covers the pressure relief port 111. One end of the guide shaft 122 is connected to the body 121, and the other end is movably inserted into the guide hole 113. The valve cover 12 is configured to move away from the valve body 11 under pressure to switch from a closed state to a pressure relief state.

[0158] An airflow blocking member 13 is disposed around the pressure relief port 111, and the airflow blocking member 13 is an arc-shaped structure extending circumferentially along the pressure relief port 111. Along the moving direction X of the valve cover 12, one end of the airflow blocking member 13 facing the valve cover 12 is connected to the valve cover 12, and the other end of the airflow blocking member 13 facing away from the valve cover 12 is slidably connected to the valve body 11. When the valve cover 12 switches to the pressure relief state, the airflow blocking member 13 unfolds under the action of the valve cover 12, and the area around the pressure relief port 111 that is not blocked by the airflow blocking member 13 forms an exhaust port 14 that communicates with the outside.

[0159] Please refer to Figure 3 And further refer to Figure 10 and Figure 11This application provides a pressure relief mechanism 10, which includes a valve body 11, a valve cover 12, and an airflow blocking member 13. The valve body 11 is provided with a pressure relief port 111 and a guide hole 113. The valve cover 12 includes a body 121 and a guide shaft 122. The body 121 covers the pressure relief port 111. One end of the guide shaft 122 is connected to the body 121, and the other end is movably inserted into the guide hole 113. The valve cover 12 is configured to move away from the valve body 11 under pressure to switch from a closed state to a pressure relief state.

[0160] An airflow blocking component 13 is disposed around the pressure relief port 111. The airflow blocking component 13 includes a first sub-component 131 and a second sub-component 132. Both the first sub-component 131 and the second sub-component 132 are circumferentially non-closed sleeve structures. The first sub-component 131 and the second sub-component 132 are slidably sleeved together along the moving direction X of the valve cover 12. The first sub-component 131 is connected to the valve cover 12, and the second sub-component 132 is connected to the valve body 11. The diameters of both the first sub-component 131 and the second sub-component 132 gradually decrease along the direction from the valve cover 12 to the valve body 11. The first sub-component 131 is sleeved on the outer circumferential surface of the second sub-component 132. The diameter of the end of the first sub-component 131 away from the valve cover 12 is R1, and the diameter of the end of the second sub-component 132 away from the valve body 11 is R2, satisfying that R2 > R1.

[0161] When the valve cover 12 is switched to the pressure relief state, the airflow blocking member 13 is opened under the action of the valve cover 12, and the area around the pressure relief port 111 that is not blocked by the first sub-member 131 and the second sub-member 132 forms an exhaust port 14 that is connected to the outside.

[0162] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0163] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure relief mechanism characterized by, include: The valve body is equipped with a pressure relief port; A valve cover, which covers the pressure relief port, is configured to move away from the valve body under pressure to switch from a closed state to a pressure relief state; An airflow blocking component is disposed around the pressure relief port and connected to the valve body and the valve cover; When the valve cover is switched to the pressure relief state, the area around the pressure relief port that is not blocked by the airflow blocking member forms an exhaust port that communicates with the outside. The airflow blocking component is a self-extending structure. One end of the airflow blocking component is connected to the valve cover, and the other end of the airflow blocking component is fixedly connected to the valve body.

2. The pressure relief mechanism of claim 1, wherein, The airflow obstruction is only provided around a portion of the pressure relief port, and the area around the pressure relief port where the airflow obstruction is not provided forms the exhaust port.

3. The pressure relief mechanism of claim 2, wherein, The airflow blocking component is an arc-shaped structure extending circumferentially along the pressure relief port.

4. The pressure relief mechanism of claim 3, wherein, The angle at which the airflow blocking component extends circumferentially along the pressure relief port is α, satisfying 120°≤α≤240°.

5. The pressure relief mechanism of claim 1, wherein, The airflow blocking component includes a first sub-component and a second sub-component, which are slidably connected along the moving direction of the valve cover. The first sub-component is connected to the valve cover, and the second sub-component is connected to the valve body.

6. The pressure relief mechanism of claim 5, wherein, Both the first sub-component and the second sub-component are circumferentially non-closed sleeve structures, and the first sub-component and the second sub-component are slidably sleeved together.

7. The pressure relief mechanism according to claim 6, characterized in that, The diameters of the first sub-component and the second sub-component gradually decrease along the direction from the valve cover to the valve body. The first sub-component is sleeved on the outer circumferential surface of the second sub-component. The diameter of the end of the first sub-component away from the valve cover is R1, and the diameter of the end of the second sub-component away from the valve body is R2, satisfying that R2 > R1.

8. The pressure relief mechanism according to claim 6, characterized in that, The diameters of the first sub-component and the second sub-component gradually increase along the direction from the valve cover to the valve body. The second sub-component is sleeved on the outer circumferential surface of the first sub-component. The diameter of the end of the first sub-component away from the valve cover is R1, and the diameter of the end of the second sub-component away from the valve body is R2, satisfying that R1 > R2.

9. The pressure relief mechanism according to any one of claims 1-8, characterized in that, Along the radial direction of the valve cover, the airflow obstruction does not extend beyond the edge of the valve cover.

10. The pressure relief mechanism according to any one of claims 1-8, characterized in that, The melting point of the airflow blocking component is higher than 500°C.

11. The pressure relief mechanism according to any one of claims 1-8, characterized in that, The airflow blocking component is a metal part.

12. The pressure relief mechanism according to any one of claims 1-8, characterized in that, The valve body has a guide hole, and the valve cover includes a body and a guide shaft. The body covers the pressure relief port, one end of the guide shaft is connected to the body, and the other end of the guide shaft is movably disposed in the guide hole.

13. A box, characterized in that, The housing is provided with a pressure relief mechanism as described in any one of claims 1-12.

14. A battery, characterized in that, include: The housing as described in claim 13; The battery cells are housed within the casing.

15. An electrical appliance, characterized in that, Includes the battery as described in claim 14, the battery being used to provide electrical energy.

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