Vent valve and manufacturing method therefor, battery cell, battery, and electric device

Abstract

The present application discloses a vent valve, a battery cell, a battery pack, and an electric device. The vent valve comprises: a metal sheet, the metal sheet at least comprising a first through hole; a connecting member, the connecting member at least comprising a second through hole, the connecting member being arranged on the metal sheet, and the first through hole being communicated with the second through hole; and a vent membrane, the vent membrane being arranged on the connecting member and covering the second through hole. By means of the provision of the connecting member, the deformation of the vent membrane during processing can be reduced, further preventing the deterioration of the vent performance caused by the deformation, thereby improving the structural stability of the vent valve, prolonging the service life of the vent valve, improving the sealing performance of the vent valve, and widening the material selection range of the vent membrane.

Description

Breathable valve and preparation method thereof, battery cell, battery and electrical equipment

Technical field

[0001] The present application relates to the field of new energy technology, and in particular to a breathable valve and a preparation method thereof, a battery cell, a battery, and an electrical device. [Background Technology]

[0002] Batteries generate gases during use, such as hydrogen from lead-acid batteries. This gas increases internal pressure, affecting battery function. Some gases can even cause combustion and explosion, posing a potential risk. Therefore, improving battery reliability is a pressing issue.

[0003] [Summary of the invention]

[0004] In view of the technical problems existing in the background technology, the present application provides a breathable valve and a preparation method thereof, a battery cell, a battery and an electrical device, aiming to improve the reliability of the battery and the electrical device.

[0005] To this end, in a first aspect, the present application provides a breathable valve comprising: a metal sheet including at least one first through-hole; a connector including at least one second through-hole, disposed on the metal sheet, the first through-hole communicating with the second through-hole; and a breathable membrane disposed on the connector and covering the second through-hole. The provision of the connector reduces deformation caused by the breathable membrane being directly bonded to the metal sheet, including physical deformation caused by stretching and deformation caused by material denaturation due to high temperatures. This mitigates the deterioration in breathability caused by deformation, improves the structural stability and service life of the breathable valve, and thereby enhances the reliability of batteries and electrical devices.

[0006] In the technical solution of the embodiment of the present application, the breathable valve further includes a backing member made of a breathable material. The connecting member surrounds the backing member, and the backing member is at least partially located within the second through hole. The backing member supports the breathable membrane, preventing deformation of the breathable membrane, thereby improving the structural stability and service life of the breathable valve.

[0007] In some embodiments, the metal sheet includes a recessed platform, the first through-hole is located in the first recessed platform, and the backing member is at least partially disposed on the first recessed platform and covers the first through-hole. The provision of the first recessed platform reduces the height difference between the surfaces of the backing member and the connector facing the breathable membrane at different heights, improving the adaptability of the assembly process to backing members and connectors of varying thicknesses. Furthermore, the first recessed platform can accommodate the backing member and connector, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0008] In some embodiments, the connector is at least partially located on the first sink, and the surface of the backing member facing the breathable membrane is flush with the surface of the connector facing the breathable membrane. When the surface of the backing member facing the breathable membrane is flush with the surface of the connector facing the breathable membrane, the problem of localized stretching and thinning of the breathable membrane due to internal stress generated by stretching, which can reduce the mechanical strength of the breathable membrane and alter its water and air permeability, is reduced during thermal bonding of the breathable membrane and the connector. This improves the structural stability and service life of the breathable valve, thereby enhancing the reliability of the battery and electrical equipment.

[0009] In some embodiments, the connector protrudes from the first recessed portion. The depth of the first recessed portion is less than the thickness of the backing member. The surface of the backing member facing the breathable membrane and the surface of the connector facing the breathable membrane are located between the surface of the metal sheet facing the breathable membrane and the breathable membrane. In this case, the first recessed portion can accommodate a portion of the connector, thereby reducing the thickness of the breathable valve and the space occupied by the breathable valve in the battery.

[0010] In some embodiments, all connectors are located within the first recess, and the depth of the first recess is greater than or equal to the thickness of the backing member. In this case, the surface of the connector facing the breathable membrane is lower than the surface of the metal sheet facing the breathable membrane, or the surface of the connector facing the breathable membrane is flush with the surface of the metal sheet facing the breathable membrane. The first recess can accommodate all connectors, further reducing the thickness of the breathable valve and the space occupied by the breathable valve in the battery.

[0011] In some embodiments, the entire vent membrane is located within the first recess, and the depth of the first recess is greater than or equal to the combined thickness of the backing member and the vent membrane. In this case, the surface of the vent membrane facing away from the backing member is located within the space of the first recess, or is flush with the surface of the metal sheet facing away from the first through-hole. The first recess can accommodate all connectors and the entire vent membrane, further reducing the thickness of the vent valve and the space occupied by the vent valve within the battery.

[0012] In some embodiments, the metal sheet further includes a second sunken platform, the second sunken platform having a greater depth than the first sunken platform, the second sunken platform being located on the bottom wall of the first sunken platform, the first sunken platform surrounding the second sunken platform, and the backing member being at least partially disposed on the second sunken platform and covering the first through-hole. By providing the first and second sunken platforms, and disposing the backing member on the second sunken platform, the thickness of the vent valve can be further reduced, thereby reducing the space occupied by the vent valve in the battery.

[0013] In some embodiments, the connector is at least partially located on the first sink, the backing member is located in the second through hole, and the surface of the backing member facing the breathable membrane is flush with the surface of the connector facing the breathable membrane. By arranging the backing member and the connector on the second sink and the first sink, respectively, the height difference between the surfaces of the backing member and the connector facing the breathable membrane at different heights is reduced, and the adaptability to backing members and connectors of different thicknesses during the assembly process is improved; when the surface of the backing member facing the breathable membrane is flush with the surface of the connector facing the breathable membrane, it is possible to reduce the problem of local stretching and thinning of the breathable membrane caused by internal stress generated by stretching, the mechanical strength of the breathable membrane, and the change in water permeability and air permeability when the breathable membrane and the connector are thermally laminated, thereby improving the structural stability and service life of the breathable valve, and thereby improving the reliability of batteries and electrical equipment.

[0014] In some embodiments, the connector protrudes from the first sink, the depth of the first sink is less than the thickness of the connector, the depth of the second sink is less than the thickness of the backing member, and the surface of the backing member facing the breathable membrane and the surface of the connector facing the breathable membrane are located between the surface of the metal sheet facing the breathable membrane and the breathable membrane. For backing members and connectors that are thick and have a large thickness difference, the arrangement of the first sink and the second sink can improve the height difference between the surfaces of the two facing the breathable membrane, thereby improving the adaptability to backing members and connectors of different thicknesses during the assembly process. At the same time, when the breathable membrane and the connector are thermally composited, the problem of local stretching and thinning of the breathable membrane due to internal stress generated by stretching is reduced, the mechanical strength of the breathable membrane is reduced, and the water permeability and air permeability are changed. This improves the structural stability and service life of the breathable valve, thereby improving the reliability of the battery and electrical equipment. At the same time, the thickness of the breathable valve is reduced, and the space occupied by the breathable valve in the battery is reduced.

[0015] In some embodiments, all the connectors are located in the first sink, and the depth of the first sink is greater than or equal to the thickness of the connector. In this case, the surface of the metal sheet facing the breathable membrane is higher than the surface of the connector facing the breathable membrane, or the surface of the metal sheet facing the breathable membrane and the surface of the connector facing the breathable membrane are flush. By placing all the connectors in the first sink, the thickness of the breathable valve is reduced, and the space occupied by the breathable valve in the battery is reduced; at the same time, the flushing of the two can reduce the problem of local stretching and thinning of the breathable membrane due to the internal stress generated by stretching, the reduction of the mechanical strength of the breathable membrane, and the change of water permeability and air permeability, thereby improving the structural stability and service life of the breathable valve, and thus improving the reliability of the battery and electrical equipment.

[0016] In some embodiments, the breathable membrane is entirely within the first recess, and the depth of the first recess is greater than or equal to the sum of the thickness of the connector and the breathable membrane. By placing the breathable membrane entirely within the first recess, the thickness of the breathable valve can be further reduced, thereby reducing the space occupied by the breathable valve in the battery.

[0017] In some embodiments, the backing member and the connecting member are both disposed on the surface of the metal sheet, and the backing member covers the first through hole. Disposing the two directly on the surface of the metal sheet reduces secondary processing of the metal sheet and saves operating steps.

[0018] In some embodiments, the connector is located on the surface of the metal sheet, and the breathable membrane is located on the surface of the connector away from the metal sheet. The provision of the connector can reduce deformation caused by the breathable membrane being directly bonded to the metal sheet, improving the deterioration in breathability caused by deformation, increasing the structural stability and service life of the breathable valve, and thereby improving the reliability of the battery and electrical equipment.

[0019] In some embodiments, the connector is located on the surface of the metal sheet and has a third recessed portion. The second through hole is located on the third recessed portion, and the breathable membrane is disposed on the third recessed portion between the connector and the metal sheet. The provision of the connector can reduce deformation caused by the breathable membrane being directly laminated to the metal sheet, thereby improving the deterioration in breathability caused by deformation, enhancing the structural stability and service life of the breathable valve, and thereby improving the reliability of the battery and electrical equipment.

[0020] In some embodiments, the metal sheet includes a first recessed portion, the first through hole is located on the first recessed portion, the connector is at least partially located on the first recessed portion, and the breathable membrane is located on a surface of the connector distal from the first through hole. The provision of the first recessed portion can accommodate at least a portion of the connector, thereby reducing the thickness of the breathable valve and the space occupied by the breathable valve in the battery.

[0021] In some embodiments, the connector protrudes from the first recess, and the depth of the first recess is less than the thickness of the connector. In this case, the first recess can accommodate part of the connector, thereby reducing the thickness of the vent valve and reducing the space occupied by the vent valve in the battery.

[0022] In some embodiments, all connectors are located within the first sink, and the depth of the first sink is greater than or equal to the thickness of the connectors. By placing all connectors within the first sink, the first sink can accommodate all connectors, further reducing the thickness of the vent valve and the space occupied by the vent valve in the battery.

[0023] In some embodiments, the breathable membrane is entirely located within the first sink, and the depth of the first sink is greater than or equal to the combined thickness of the backing member and the breathable membrane. By placing the breathable membrane entirely within the first sink, the first sink can accommodate all connectors and the breathable membrane, further reducing the thickness of the breathable valve and the space occupied by the breathable valve within the battery.

[0024] In some embodiments, the thickness of the connector is 50-1000 μm. This configuration not only helps to improve the bonding strength between the connector and the metal sheet, and between the connector and the breathable membrane, but also reduces the thickness of the breathable valve, thereby reducing the space occupied by the breathable valve in the battery.

[0025] In some embodiments, the connector comprises a polypropylene polymer and / or a modified polypropylene polymer. The modified polypropylene polymer is a polypropylene polymer having surface polar functional groups, such as -OH, -COOH, and / or -NH2. Optionally, the breathable membrane and the connector may be made of the same or different materials. This configuration reduces the weight of the breathable valve due to the low density of the polypropylene polymer. Furthermore, the polar functional groups allow for chemical bonding between the connector and the metal sheet, improving interfacial bonding strength, enhancing the structural stability and service life of the breathable valve, and thereby increasing the reliability of the battery and electrical equipment.

[0026] In a second aspect, the present application provides a method for preparing a breathable valve, comprising: providing a metal sheet, the metal sheet including at least one first through-hole; providing a connector, setting the connector on the metal sheet, the connector including at least one second through-hole, the first through-hole communicating with the second through-hole; providing a breathable membrane, setting the breathable membrane on the connector and covering the second through-hole, the heat treatment temperature of the connector and the metal sheet being greater than or equal to the glass transition temperature of the breathable membrane, and the heat treatment temperature of the breathable membrane and the connector being less than the glass transition temperature of the breathable membrane. By providing the connector, the heat treatment temperature of the connector and the metal sheet being greater than or equal to the glass transition temperature of the breathable membrane, and the heat treatment temperature of the breathable membrane and the connector being less than the glass transition temperature of the breathable membrane, deformation generated during the direct compounding of the breathable membrane and the metal sheet can be reduced, further improving the problem of deterioration in breathability performance caused by deformation, improving the structural stability and service life of the breathable valve, and thereby improving the reliability of batteries and electrical equipment.

[0027] In a third aspect, the present application provides a battery cell comprising: a housing assembly; and a vent valve described in any one of the above or a vent valve prepared by a vent valve preparation method, disposed within the housing assembly. This arrangement improves the structural stability and service life of the vent valve, thereby enhancing battery reliability.

[0028] In the technical solution of the embodiment of the present application, the housing assembly includes a top cover and a shell. The top cover or shell has a vent hole and a mounting sink disposed around the vent hole. The mounting sink is located on the side of the top cover or shell facing or away from the battery cell structure. The vent valve is disposed on the mounting sink. By providing the vent hole and the mounting sink surrounding the vent hole in the top cover or shell, the vent valve can be positioned in different locations on the battery cell according to the specific application scenario, thereby enhancing the flexibility of the vent valve placement and meeting different application needs.

[0029] In a fourth aspect, the present application provides a battery comprising any of the above-described vent valves or vent valves prepared by the vent valve preparation method, or the aforementioned battery cell. The above-described configuration improves the structural stability and service life of the vent valve, thereby improving the reliability of the battery.

[0030] In a fifth aspect, the present application provides an electrical device comprising the aforementioned battery. Through the above arrangement, the structural stability and service life of the vent valve are improved, thereby improving the reliability of the battery.

[0031] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solution of this application, the following briefly introduces the drawings required for use in the embodiments of this application. 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 inventive work. In the drawings:

[0033] FIG1 is a schematic structural diagram of a breathable valve according to one or more embodiments of the present application;

[0034] FIG2 is a cross-sectional view of the vent valve shown in FIG1 ;

[0035] FIG3 is a schematic structural diagram of a metal sheet of a breathable valve according to one or more embodiments of the present application;

[0036] FIG4 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0037] FIG5 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0038] FIG6 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0039] FIG7 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0040] FIG8 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0041] FIG9 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0042] FIG10 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0043] FIG11 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0044] FIG12 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0045] FIG13 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0046] FIG14 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0047] FIG15 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0048] FIG16 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0049] FIG17 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0050] FIG18 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0051] FIG19 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0052] FIG20 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0053] FIG21 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0054] FIG22 is a schematic cross-sectional view of a breathable valve according to one or more embodiments of the present application;

[0055] FIG23 is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0056] FIG24 is a schematic diagram of an exploded structure of a battery according to an embodiment of the present application;

[0057] FIG25 is a schematic structural diagram of an electrical device according to an embodiment of the present application.

[0058] In the accompanying drawings: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - housing; 20 - battery cell; 30 - vent valve; 11 - first part; 12 - second part; 21 - top cover assembly; 22 - housing; 23 - battery cell structure; 21a - electrode terminal; 21b - explosion-proof valve; 21c - shielding member; 211 - vent hole; 212 - mounting platform; 31 - metal sheet; 32 - breathable membrane; 33 - connector; 34 - backing member; 31a - first surface; 31b - second surface; 32a - third surface; 32b - fourth surface; 33a - fifth surface; 33b - sixth surface; 34 a-seventh surface; 34b-eighth surface; 310-first through hole; 311-first sink; 312-second sink; 330-second through hole; 331-third sink; 311a-first sink surface; 312a-second sink surface; 331a-third sink surface; D1-depth of the first sink; D2-depth of the second sink; D3-thickness of the third sink; H-thickness of the backing member; h-thickness of the connecting member; A-thickness of the breathable membrane. [Specific implementation method]

[0059] In order to make the purpose, technical solution and effect of this application clearer and more specific, the following embodiments of the technical solution of this application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two (including two), and "multiple pieces" refers to more than two (including two), unless otherwise clearly and specifically defined.

[0062] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0064] Amounts, ratios, and other numerical values ​​are presented herein in a range format. It should be understood that such range format is used for convenience and brevity and should be interpreted flexibly to include not only the values ​​explicitly specified as range limits, but also all individual values ​​or sub-ranges encompassed within the range, as if each value and sub-range were explicitly specified.

[0065] If not otherwise specified, all steps of the present application may be performed sequentially, randomly, or in parallel, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially, or may include steps (a) and (b) performed simultaneously in parallel. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0066] Batteries are a key component of new energy technologies and are widely used in areas such as powering electronic devices, powering electric vehicles, and storing and regulating renewable energy. Reliability is a crucial consideration during battery use; highly reliable batteries can reduce losses caused by accidents. Furthermore, battery reliability directly impacts the breadth of its applications. Highly reliable batteries can be widely used in more critical applications with higher reliability requirements. Therefore, developing highly reliable batteries is key to the further development of the battery industry.

[0067] The gases generated by batteries during use primarily come from the following sources: First, the redox decomposition of the electrolyte. As the voltage of the positive and negative electrodes changes, the electrolyte tends to be oxidized / reduced on the positive / negative electrode surfaces, leading to gas generation. Second, residual impurities in the positive electrode material decompose and generate gas during battery cycling. Third, residual water from insufficient drying and water generated by side reactions undergo electrolysis when exposed to current, generating hydrogen and oxygen. Fourth, when the battery is overcharged or over-discharged, the decomposition of chemical materials produces gases such as acetylene and carbon monoxide. The accumulation of these gases can increase internal battery pressure, leading to not only voltage swells and electrolyte overflow, but also, in severe cases, explosions.

[0068] In summary, developing a highly reliable battery exhaust device is crucial for ensuring the proper lifespan of batteries, improving their charge and discharge performance, and reducing accidents. This is also a necessary condition for the battery industry to achieve large-scale application and truly enter the lives of the general public.

[0069] Therefore, it is essential to equip batteries with vent valves to promptly discharge various gases generated within the battery and ensure proper operation. The inventors have discovered that the vent valves currently used in batteries can deform over time, affecting their venting function. This phenomenon occurs because the vent membrane in current battery vent valves, which performs the venting function, also serves as a seal with the metal sheet. When the vent membrane and metal sheet are directly bonded, the temperature during processing can reach the membrane's glass transition temperature, causing changes in the membrane's material structure, leading to deformation and poor venting performance.

[0070] To address the above-mentioned issues, the present application provides a breathable valve. Referring to Figures 1 and 2 , the breathable valve 30 includes a metal sheet 31, a breathable membrane 32, and a connector 33. The metal sheet 31 includes at least one first through-hole 310. The connector 33 includes at least one second through-hole 330. The connector 33 is disposed on the metal sheet 31. The first through-hole 310 corresponds to the second through-hole 330. The breathable membrane 32 is disposed on the connector 33 and covers the second through-hole 330.

[0071] In some embodiments, the metal sheet 31 has a first surface 31a and a second surface 31b disposed opposite each other. The breathable membrane 32 has a third surface 32a and a fourth surface 32b disposed opposite each other. The connector 33 has a fifth surface 33a and a sixth surface 33b disposed opposite each other. The fifth surface 33a of the connector 33 is fixedly connected to the first surface 31a of the metal sheet 31. The sixth surface 33b of the connector 33 is fixedly connected to the third surface 32a of the breathable membrane 32.

[0072] The vent valve 30 is a removable protective component installed on the battery. It is formed by combining a breathable membrane with a valve body through processes such as injection molding, welding, bonding, and hot-melt. It is used to control internal battery gases such as carbon dioxide, hydrogen, and methane. During the battery's lifecycle, when the internal pressure reaches a certain level, the vent valve 30 allows internal gas to escape, reducing the internal pressure and effectively improving the battery's long-term reliability. Once the internal pressure decreases, the vent valve 30 prevents external air, moisture, and dust from entering the battery.

[0073] Among the various components of the vent valve 30, the metal sheet 31 connects the vent valve 30 to the top cover of the battery cell, using methods such as laser welding. The metal sheet 31 also supports the vent membrane. Referring to Figure 3 , the metal sheet 31 is provided with at least one first through-hole 310, which serves as a channel for the release of internal battery gas. The shapes of the first through-hole 310 include circular, square, and elliptical shapes. The metal sheet 31 can also be provided with multiple through-holes. The aperture, shape, and arrangement of the through-holes are not specifically limited here.

[0074] The breathable membrane 32 is the core component of the breathable valve 30. When the battery produces gas and the internal pressure of the battery increases, the breathable membrane 32 is elastically expanded under pressure to produce a gap, forming a pressure relief channel. Taking into account the application environment of the battery, the breathable membrane 32 first needs to have good air permeability. Therefore, the material of the breathable membrane is a porous structure with a pore size between 0.1-10μm. At this time, air molecules can pass freely while water molecules and large molecules of dust impurities cannot pass through. At the same time, it needs to have good weather resistance, chemical corrosion resistance, and structural stability. If it is an automotive power battery, it also needs to have oleophobicity. Therefore, the material of the breathable membrane 32 is usually a polymer material, such as polytetrafluoroethylene, polypropylene, etc. In addition, since the generation of gas inside the battery will cause the internal pressure to rise rapidly, the breathable membrane 32 needs to have a certain mechanical strength and elasticity.

[0075] In this application, in addition to the metal sheet 31 and the breathable membrane 32, a connector 33 is added. The connector 33 includes at least one second through-hole 330, corresponding to the first through-hole 310 of the metal sheet 31. The shape of the second through-hole 330 can be a circular, square, elliptical, or other geometric shape. The outer contour of the connector 33 can be a circular, square, elliptical, or other geometric shape. The connector 33 connects the breathable membrane 32 and the metal sheet 31, providing both sealing and connection functions.

[0076] During the manufacturing process of the vent valve 30, the connector 33 is first thermally bonded to the metal sheet 31, followed by the thermal fusion of the breathable membrane 32 and the connector 33. The bonding conditions for the membrane 32 and connector 33 are milder than those for the metal sheet 31 and connector 33. Without the connector 33, the membrane 32 and metal sheet 31 are directly fixed together. During this process, the stretching during the bonding process causes the membrane to physically deform. Furthermore, when the temperature exceeds the glass transition temperature of the membrane 32, the molecular chains within the polymer material begin to move, causing the deformation to gradually increase and become irreversible, thus causing the membrane 32 to deform. For example, when the temperature exceeds 327°C, the structural and performance stability of polytetrafluoroethylene begins to decline, ultimately leading to a decrease in the sealing performance of the vent valve and a change in the membrane's venting function. Therefore, the present application can reduce the deformation of the breathable membrane under high temperature and high pressure environment, further improve the deterioration of the breathable performance caused by deformation, thereby improving the structural stability and service life of the breathable valve, and further improving the reliability of batteries and electrical equipment.

[0077] According to some embodiments of the present application, the breathable valve 30 further includes a backing member 34 . The backing member 34 is made of breathable material, the connecting member 33 surrounds the backing member 34 , and the backing member 34 is at least partially located in the second through hole 330 .

[0078] The backing member is the component in the vent valve that supports the membrane and prevents deformation. The backing member has better air permeability than the membrane and therefore does not affect the membrane's ventilation process. It is chemically stable, resistant to acid and alkali corrosion, and weather-resistant, making it adaptable to harsh operating environments. Its melting point is greater than 140°C, making it less susceptible to deformation at high battery temperatures, supporting and securing the membrane. Its thickness ranges from 0.2 to 2 mm, ensuring a balanced support function and a reasonable thickness for the vent valve. A wide range of materials are available, including porous polymers such as polypropylene, polyamide, polytetrafluoroethylene, and polyperfluoroethylene propylene (FEP), as well as porous metal-organic frameworks (MOFs), carbon membranes, and ceramics.

[0079] The shape and size of the backing member match the inner contour of the connector, and the outer edge of the backing member abuts the inner edge of the connector without any gap. This arrangement reduces the risk of the breathable membrane collapsing or deforming at the edge of the gap between the connector and the backing member due to the gap between the backing member and the connector during thermal bonding. This improves the performance stability of the breathable membrane, the structural stability and service life of the breathable valve, and ultimately the reliability of the battery and electrical equipment.

[0080] According to some embodiments of the present application, the metal sheet 31 includes a depression 311. Referring to Figures 4 to 9 , the metal sheet 31 includes at least one first through-hole 310. The first through-hole 310 is located on the first depression 311. The backing member 34 is at least partially disposed on the first depression 311 and covers the first through-hole 310. The first depression 311 has a first depression surface 311a. The first depression surface 311a faces the first surface 31a. The first through-hole 310 extends through the first depression surface 311a and the second surface 31b.

[0081] In one embodiment, the connector 33 is at least partially located on the first sink 311, and the surface of the backing member 34 facing the breathable membrane 32 is flush with the surface of the connector 33 facing the breathable membrane 32. In some embodiments, the backing member 34 has a seventh surface 34a and an eighth surface 34b disposed opposite each other. The eighth surface 34b is flush with the sixth surface 33b.

[0082] The presence of the backing member provides additional support for the breathable membrane, making it less susceptible to deformation during operation and improving the structural stability and service life of the valve. Furthermore, the step between the backing member and the connector is reduced or eliminated. This reduces the problem of localized thinning of the membrane due to internal stress caused by stretching during thermal lamination of the membrane and connector, which can reduce the membrane's mechanical strength and alter its water and air permeability. This improves the valve's structural stability and service life, thereby enhancing the reliability of batteries and electrical equipment.

[0083] By providing a first sink, the surface of the backing member facing the breathable membrane is flush with the surface of the connector facing the breathable membrane, reducing the height difference between the surfaces of the backing member and the connector facing the breathable membrane at different heights, improving the adaptability of the assembly process to backing members and connectors of different thicknesses. At the same time, when the breathable membrane and the connector are thermally laminated, the problem of local stretching and thinning of the breathable membrane due to internal stress generated by stretching, reduced mechanical strength of the breathable membrane, and changes in water permeability and air permeability is reduced, thereby improving the structural stability and service life of the breathable valve, thereby improving the reliability of the battery and electrical equipment. In addition, the first sink provided in the metal sheet can accommodate the backing member and the connector, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0084] In one embodiment, the connecting member 33 can also be directly provided on the surface of the metal sheet 31, refer to FIG4 , the depth D1 of the first depression 311 is less than the thickness H of the backing member 34. The connecting member 33 is located between the surface of the metal sheet 31 facing the breathable membrane 32 and the breathable membrane 32. The backing member 34 is located on the first depression 311. At this time, the fifth surface 33a of the connecting member 33 and the first surface 31a of the metal sheet 31 are fixedly connected. The backing member 34 is accommodated in the first depression 311 and the second through hole 330. The third surface 32a of the breathable membrane 32 and the sixth surface 33b of the connecting member 33 are fixedly connected and covered on the backing member 34.

[0085] For backing members and connectors with significantly different thicknesses, the backing member is placed on the first sink to improve the height difference between the two surfaces facing the breathable membrane. This improves the adaptability of the assembly process to backing members and connectors of different thicknesses. At the same time, when the breathable membrane and connector are thermally laminated, the problem of localized thinning of the breathable membrane due to internal stress generated by stretching is reduced, which reduces the mechanical strength of the breathable membrane and changes in its water and air permeability. This improves the structural stability and service life of the breathable valve, thereby improving the reliability of the battery and electrical equipment. In addition, the first sink provided in the metal sheet can accommodate the backing member or the backing member and connector, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0086] In one embodiment, please continue to refer to Figure 5. The connecting member 33 protrudes from the first depression 311. The depth D1 of the first depression 311 is less than the thickness H of the backing member 34. The surface of the backing member 34 facing the breathable membrane 32 and the surface of the connecting member 33 facing the breathable membrane 32 are located between the surface of the metal sheet 31 facing the breathable membrane 32 and the breathable membrane 32. At this time, the connecting member 33 and the backing member 34 are both located on the first depression 311. The fifth surface 33a of the connecting member 33 is fixedly connected to the first depression surface 311a of the first depression 311. The backing member 34 is accommodated in the second through hole 330. The third surface 32a of the breathable membrane and the sixth surface 33b of the connecting member 33 are fixedly connected, covering the backing member 34.

[0087] For backing members and connectors with larger thickness, by arranging the connector and backing member on the first sink, the first sink set in the metal sheet can accommodate the backing member and the connector, thereby reducing the thickness of the air valve and reducing the space occupied by the air valve in the battery.

[0088] In one embodiment, referring to FIG. 6 to FIG. 9 , the connecting member 33 is entirely located in the first recessed portion 311 , and the depth D1 of the first recessed portion 311 is greater than or equal to the thickness H of the backing member 34 .

[0089] The first case is that the depth D1 of the first sink 311 is equal to the thickness H of the backing member 34. Referring to Figure 6, the connecting member 33 and the backing member 34 are both located on the first sink 311. The surface of the connecting member 33 facing the breathable membrane 32, the surface of the backing member 34 facing the breathable membrane 32, and the surface of the metal sheet 31 facing the breathable membrane 32 are flush. At this time, the fifth surface 33a of the connecting member 33 is fixedly connected to the first sink surface 311a of the first sink 311. The backing member 34 is accommodated in the second through hole 330. The third surface 32a of the breathable membrane 32 and the sixth surface 33b of the connecting member 33 are fixedly connected, covering the backing member 34. Because the connecting member and the backing member are both located on the first sink, the surface of the connecting member facing the breathable membrane, the surface of the backing member facing the breathable membrane, and the surface of the metal sheet facing the breathable membrane are flush, thereby improving the height difference between the three. When the breathable membrane and the connecting member are thermally composited, the problems of local stretching and thinning of the breathable membrane caused by internal stress generated by stretching, reduced mechanical strength of the breathable membrane, and changed water and air permeability are reduced, thereby improving the structural stability and service life of the breathable valve, and thereby improving the reliability of batteries and electrical equipment.

[0090] The second scenario is when the depth D1 of the first depression 311 is greater than the thickness H of the backing member 34. Referring to Figures 7 through 9 , both the connector 33 and the backing member 34 are located within the first depression 311. At least a portion of the breathable membrane 32 is located within the space of the first depression 311. As shown in Figure 7 , in some embodiments, the surface of the breathable membrane 32 facing away from the backing member 34 protrudes beyond the surface of the metal sheet 31 facing away from the first through-hole 310.

[0091] In one embodiment, the breathable membrane 32 is entirely located within the first depression 311, and the depth D1 of the first depression 311 is greater than or equal to the sum of the thicknesses (H + A) of the backing member 34 and the breathable membrane 32. As shown in Figure 8, in some embodiments, the surface of the breathable membrane 32 away from the backing member 34 is flush with the surface of the metal sheet 31 away from the first through-hole 310. As shown in Figure 9, in some embodiments, the surface of the breathable membrane 32 away from the backing member 34 is located within the space of the first depression 311.

[0092] In Figures 7 to 9 , the fifth surface 33a of the connector 33 is fixedly connected to the first sinking surface 311a of the first sinking platform 311. The backing member 34 is accommodated in the second through hole 330. The third surface 32a of the breathable membrane 32 is fixedly connected to the sixth surface 33b of the connector 33, covering the backing member 34.

[0093] As shown in FIG. 7 , the fourth surface 32 b of the breathable membrane 32 protrudes from the first surface 31 a of the metal sheet 31 .

[0094] As shown in FIG. 8 , the fourth surface 32 b of the breathable membrane 32 is flush with the first surface 31 a of the metal sheet 31 .

[0095] As shown in FIG. 9 , the fourth surface 32 b of the breathable membrane 32 is located in the space of the first sink 311 .

[0096] By setting up a first sink and making the connecting member and the backing member both located on the first sink, at least part of the breathable membrane is located in the space of the first sink, which can reduce the thickness of the breathable valve and reduce the space occupied by the breathable valve in the battery; when the entire breathable membrane is located in the space of the first sink, the thickness of the breathable valve can be further reduced and the space occupied by the breathable valve in the battery can be reduced.

[0097] In some embodiments, referring to Figures 10 to 14, the metal sheet 31 further includes a second sink 312, the depth D2 of the second sink 312 being greater than the depth D1 of the first sink 311, the second sink 312 being located on the bottom wall of the first sink 311, the first sink 311 surrounding the second sink 312, and the backing member 34 being at least partially disposed on the second sink 312 and covering the first through hole 310. The first sink 311 has a first sink surface 311a. The second sink 312 has a second sink surface 312a. The second sink surface 312a faces the first surface 31a of the metal sheet 31. The first through hole 310 extends through the second sink surface 312a and the second surface 31b of the metal sheet 31.

[0098] By providing the first sunken platform and the second sunken platform, the thickness of the vent valve can be further reduced, thereby reducing the space occupied by the vent valve in the battery.

[0099] In one embodiment, the connecting member 33 is at least partially located on the first sink 311 , the backing member 34 is located in the second through hole 330 , and the surface of the backing member 34 facing the breathable membrane 32 is flush with the surface of the connecting member 33 facing the breathable membrane 32 .

[0100] By arranging the backing member and the connecting member on the second sinking platform and the first sinking platform respectively, the height difference between the surfaces of the backing members and the connecting member facing the breathable membrane at different heights is reduced, and the adaptability to backing members and connecting members of different thicknesses during the assembly process is improved; by arranging the surface of the backing member facing the breathable membrane to be flush with the surface of the connecting member facing the breathable membrane, when the breathable membrane and the connecting member are thermally composited, the problems of local stretching and thinning of the breathable membrane caused by internal stress generated by stretching, reduced mechanical strength of the breathable membrane, and changed water and air permeability are reduced, thereby improving the structural stability and service life of the breathable valve, and thereby improving the reliability of batteries and electrical equipment.

[0101] In one embodiment, referring to FIG. 10 , the connector 33 protrudes from the first recessed platform 311. The depth D1 of the first recessed platform 311 is less than the thickness h of the connector 33. The depth D2 of the second recessed platform 312 is less than the thickness H of the backing member 34. The surface of the backing member 34 facing the breathable membrane 32 and the surface of the connector 33 facing the breathable membrane 32 are located between the surface of the metal sheet 31 facing the breathable membrane 32 and the breathable membrane 32. At this time, the fifth surface 33a of the connector 33 is fixedly connected to the first recessed platform surface 311a of the first recessed platform 311, and the sixth surface 33b of the connector 33 protrudes from the first surface 31a of the metal sheet 31. The backing member 34 is accommodated in the second recessed platform 312 and the second through hole 330. The third surface 32a of the breathable membrane 32 and the sixth surface 33b of the connector 33 are fixedly connected, covering the backing member 34.

[0102] For backing members and connectors that are thick and have a large thickness difference, the first and second sinks can improve the height difference between the two surfaces facing the breathable membrane, thereby improving the adaptability of the assembly process to backing members and connectors of different thicknesses. At the same time, when the breathable membrane and the connector are thermally laminated, the problem of local stretching and thinning of the breathable membrane due to internal stress generated by stretching, reduced mechanical strength of the breathable membrane, and changes in water permeability and air permeability is reduced, thereby improving the structural stability and service life of the breathable valve, thereby improving the reliability of batteries and electrical equipment. In addition, for backing members and connectors with larger thicknesses, the first and second sinks set in the metal sheet can accommodate the connector and backing member, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0103] In some embodiments, referring to FIG. 11 to FIG. 14 , the entire connecting member 33 is located within the first recessed portion 311 , and the depth D1 of the first recessed portion 311 is greater than or equal to the thickness h of the connecting member 33 .

[0104] The first case is that the depth D1 of the first sink 311 is equal to the thickness h of the connector 33, and at this time, the depth D2 of the second sink 312 is equal to the thickness H of the backing member 34. Please refer to Figure 11. The surface of the metal sheet 31 facing the breathable membrane 32, the surface of the connector 33 facing the breathable membrane 32, and the surface of the backing member 34 facing the breathable membrane 32 are all flush. At this time, the fifth surface 33a of the connector 33 and the first sink surface 311a of the first sink 311 are fixedly connected, and the first surface 31a of the metal sheet 31, the sixth surface 33b of the connector 33, and the eighth surface 34b of the backing member 34 are all flush. The backing member 34 is accommodated in the second sink 312 and the second through hole 330. The third surface 32a of the breathable membrane 32 and the sixth surface 33b of the connector 33 are fixedly connected and cover the backing member 34.

[0105] By making the surface of the metal sheet facing the breathable membrane, the surface of the connecting piece facing the breathable membrane, and the surface of the backing piece facing the breathable membrane flush, the height difference between the three is improved. When the breathable membrane and the connecting piece are thermally composited, the problems of local stretching and thinning of the breathable membrane caused by internal stress generated by stretching, reduced mechanical strength of the breathable membrane, and changed water and air permeability are reduced, thereby improving the structural stability and service life of the breathable valve, thereby improving the reliability of batteries and electrical equipment.

[0106] In the second case, the depth D1 of the first depression 311 is greater than the thickness h of the connector 33. In this case, the depth D2 of the second depression 312 is greater than the thickness H of the backing member 34. Referring to Figure 12 , in this case, a portion of the breathable membrane 32 is located within the space of the first depression 311, and the surface of the breathable membrane 32 facing away from the backing member 34 protrudes beyond the surface of the metal sheet 31 facing away from the first through-hole 310.

[0107] In one embodiment, referring to Figures 13 and 14 , the breathable membrane 32 is entirely located within the first recessed platform 311 , and the depth D1 of the first recessed platform 311 is greater than or equal to the sum of the thicknesses of the connector 33 and the breathable membrane 32 (h + A). In some embodiments, as shown in Figure 13 , the surface of the breathable membrane 32 facing away from the backing member 34 is flush with the surface of the metal sheet 31 facing away from the first through-hole 310 ; in some embodiments, as shown in Figure 14 , the surface of the breathable membrane 32 facing away from the backing member 34 is located within the space of the first recessed platform 311 .

[0108] In the above embodiment, the fifth surface 33a of the connector 33 is fixedly connected to the first sinking surface 311a of the first sinking platform 311, and the sixth surface 33b of the connector 33 is located within the space of the first sinking platform 311. The backing member 34 is accommodated between the second sinking platform 312 and the second through hole 330. The third surface 32a of the breathable membrane 32 is fixedly connected to the sixth surface 33b of the connector 33, covering the backing member 34.

[0109] As shown in FIG. 12 , the fourth surface 32 b of the breathable membrane 32 protrudes from the first surface 31 a of the metal sheet 31 .

[0110] As shown in FIG. 13 , the fourth surface 32 b of the breathable membrane 32 is flush with the first surface 31 a of the metal sheet 31 .

[0111] As shown in FIG. 14 , the fourth surface 32 b of the breathable membrane 32 is located in the space of the first sink 311 .

[0112] By arranging the connecting member and the backing member on the first sinker and the second sinker, and arranging at least part of the breathable membrane in the space of the first sinker, the thickness of the breathable valve is reduced, and the space occupied by the breathable valve in the battery is reduced; when the breathable membrane is entirely located in the space of the first sinker, the thickness of the breathable valve can be further reduced, and the space occupied by the breathable valve in the battery can be reduced.

[0113] According to some embodiments of the present application, the metal sheet may not have a sink. Referring to FIG. 15 , the air valve 30 includes a backing member 34 . The backing member 34 is made of a breathable material. Both the backing member 34 and the connector 33 are disposed on the first surface 31a of the metal sheet 31 . The connector 33 surrounds the backing member 34 . The backing member 34 is positioned within the second through-hole 330 and covers the first through-hole 310 .

[0114] In one embodiment, the surface of the backing member 34 facing the breathable membrane 32 is flush with the surface of the connecting member 33 facing the breathable membrane 32 , that is, the eighth surface 34 b of the backing member 34 is flush with the sixth surface 33 b of the connecting member 33 .

[0115] By providing a backing member, the support force on the breathable membrane is increased, making it less likely to deform during the process of battery gas production, which causes the breathable membrane to expand, and gas release, which causes the breathable membrane to contract. By making the surface of the backing member facing the breathable membrane flush with the surface of the connecting member facing the breathable membrane, the problem of localized stretching and thinning of the breathable membrane due to internal stress caused by stretching, which reduces the mechanical strength of the breathable membrane and changes in water and air permeability during thermal bonding of the breathable membrane and the connecting member is reduced. This improves the structural stability and service life of the breathable valve, thereby improving the reliability of the battery and electrical equipment. In addition, by directly providing the two components on the surface of the metal sheet, secondary processing of the metal sheet is reduced, saving operating steps.

[0116] According to some embodiments of the present application, the metal sheet may not have a sink, and the breathable valve may not include a backing member, as shown in Figure 16. The first through-hole 310 of the metal sheet 31 passes through the metal sheet 31 along the thickness direction of the metal sheet 31. The second through-hole 330 of the connector 33 passes through the connector 33 along the thickness direction of the connector 33. The fifth surface 33a of the connector 33 is fixedly connected to the first surface 31a of the metal sheet 31. The first through-hole 310 corresponds to the second through-hole 330. The breathable membrane 32 is disposed on the connector 33, covering the second through-hole 330. The third surface 32a of the breathable membrane is fixedly connected to the sixth surface 33b of the connector.

[0117] Because there's no backing member, to provide sufficient support for the breathable membrane, the metal sheet is typically configured with two or more through-holes, and the corresponding connector is also configured with two or more through-holes corresponding to the metal sheet. This arrangement provides greater support for the breathable membrane, making it less susceptible to deformation during the battery's gas production, which causes the breathable membrane to expand, and gas release, which causes it to contract. This improves the structural stability and service life of the breathable valve, thereby enhancing the reliability of the battery and electrical equipment.

[0118] In one embodiment, the connector has a third depression, please refer to Figure 17. The first through hole 310 of the metal sheet 31 passes through the metal sheet 31 along the thickness direction of the metal sheet 31. The second through hole 330 of the connector 33 passes through the connector 33 along the thickness direction of the connector 33, and the connector also has a third depression 331. The fifth surface 33a of the connector is fixedly connected to the first surface 31a of the metal sheet 31. The first through hole 310 corresponds to the second through hole 330. The breathable membrane 32 is arranged on the connector 33, between the connector and the metal sheet. The third depression surface 331a of the connector is fixedly connected to the third surface 32a of the breathable membrane, and the depth D3 of the third depression 331 is equal to the thickness A of the breathable membrane 32. Similarly, since there is no backing member, in order to provide sufficient support for the breathable membrane, the through holes of the metal sheet are usually set to two or more.

[0119] By providing a connector, the deformation generated during the direct compounding of the breathable membrane and the metal sheet can be reduced, the problem of poor breathability caused by deformation can be improved, the structural stability and service life of the breathable valve can be improved, and the reliability of batteries and electrical equipment can be improved.

[0120] According to some embodiments of the present application, the metal sheet includes a first sink, but the breathable valve does not include a backing member. Referring to Figures 18 to 22, the metal sheet 31 includes a first sink 311, the first through hole 310 is located on the first sink 311, the connector 33 is at least partially located on the first sink 311, and the breathable membrane 32 is located on the surface of the connector 33 away from the first through hole 310. The first sink 311 has a first sink surface 311a. The first sink surface 311a faces the first surface 31a of the metal sheet 31. The first through hole 310 passes through the first sink surface 311a and the second surface 31b. The fifth surface 33a of the connector 33 is fixedly connected to the first sink surface 311a of the first sink 311 of the metal sheet 31. The breathable membrane 32 is located on the surface of the connector 33 away from the first through hole 310, that is, the third surface 32a of the breathable membrane 32 is fixedly connected to the sixth surface 33b of the connector 33.

[0121] By setting up the first sink, at least part of the connector can be accommodated, thereby reducing the thickness of the air valve and reducing the space occupied by the air valve in the battery cell; the first sink can also provide support for the connector, and at the same time, the connector is connected to the side of the sink, which can enhance the interface bonding between the connector and the metal sheet, thereby improving the structural stability of the air valve.

[0122] In some embodiments, referring to FIG. 18 , the connector 33 protrudes from the first depression 311, and the depth D1 of the first depression 311 is less than the thickness h of the connector 33. The breathable membrane 32 is located on the surface of the connector 33 away from the first through hole 310, that is, the breathable membrane 32 is located on the sixth surface 33b of the connector 33. At this time, the first depression can accommodate part of the connector, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery; at the same time, the first depression can provide support for the connector, and the connector can be connected to the side of the first depression, which can enhance the interface between the connector and the metal sheet, thereby improving the structural stability of the breathable valve.

[0123] In some embodiments, referring to Figures 19 to 22, the connector 33 is entirely located within the first sink 311, and the depth D1 of the first sink 311 is greater than or equal to the thickness h of the connector 33. The breathable membrane 32 is located on the surface of the connector 33 away from the first through hole 310, that is, the breathable membrane 32 is located on the sixth surface 33b of the connector 33. By placing all the connectors within the first sink, the first sink can accommodate all the connectors, further reducing the thickness of the air valve and reducing the space occupied by the air valve in the battery. At the same time, the first sink can also provide support for the connector, and the connector can be connected to the side of the first sink, which can enhance the interface between the connector and the metal sheet, thereby improving the structural stability of the air valve.

[0124] In one embodiment, referring to Figure 19, the first case is that the depth D1 of the first sink 311 is equal to the thickness h of the connector 33. In this case, the first sink can accommodate all the connectors, further reducing the thickness of the air valve.

[0125] In one embodiment, referring to Figure 20 , the second scenario is that the depth D1 of the first recessed platform 311 is greater than the thickness h of the connector 33. As shown in Figure 20 , the surface of the breathable membrane 32 distal from the first through-hole 310 protrudes beyond the surface of the metal sheet 31 distal from the first through-hole 310. In other words, the fourth surface 32b of the breathable membrane 32 protrudes beyond the first surface 31a of the metal sheet 31. In this case, the first recessed platform can accommodate all connectors and part of the breathable membrane, further reducing the thickness of the breathable valve.

[0126] In some embodiments, the first sink can accommodate all connectors and all breathable membranes. Please refer to Figures 21 and 22. The breathable membrane 32 is entirely located within the first sink 311. The depth D1 of the first sink 311 is greater than or equal to the sum of the thicknesses (h+A) of the connector 33 and the breathable membrane 32. As shown in Figure 21, the surface of the breathable membrane 32 away from the first through hole 310 is flush with the surface of the metal sheet 31 away from the first through hole 310, that is, the fourth surface 32b of the breathable membrane 32 is flush with the first surface 31a of the metal sheet 31; as shown in Figure 22, the surface of the breathable membrane 32 away from the first through hole 310 is located within the space of the first sink 311, that is, the fourth surface 32b of the breathable membrane 32 is located within the space of the first sink 311.

[0127] By setting the depth of the first sink to be greater than or equal to the sum of the thickness of the connector and the breathable membrane, the first sink can accommodate the connector and the breathable membrane, thereby further reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0128] According to some embodiments of the present application, the thickness of the connector is within the range of 50-1000 μm. Within this thickness range, the bonding strength between the connector and the metal sheet, and between the connector and the breathable membrane can be improved, and the thickness of the breathable valve can be made smaller, thereby reducing the space occupied by the breathable valve in the battery cell.

[0129] According to some embodiments of the present application, the material of the connecting piece includes a polypropylene-based polymer material and / or a modified polypropylene-based polymer material. The modified polypropylene-based polymer material is a polypropylene-based polymer material containing polar functional groups on the surface. The polar functional groups include -OH, -COOH and / or -NH2. Optionally, the materials of the breathable membrane and the connecting piece are the same or different.

[0130] The material of the connector can be a modified polypropylene-based polymer material, for example, a polypropylene-based polymer material modified with maleic anhydride can be used. The modified polypropylene-based polymer material is a polypropylene-based polymer material containing polar functional groups on the surface, and the polar functional groups include -OH, -COOH and / or -NH2, etc. The metal sheet surface is modified by nano-processing, and preferably, the metal sheet is an aluminum sheet. This allows the two to form a chemical bond, which can effectively improve the interfacial bonding strength. In addition, the polypropylene-based polymer material has the characteristics of low density, good processing properties, and good chemical resistance, which can reduce the weight of the vent valve, is convenient to molding, and can adapt to the internal environment of the battery. The polypropylene material has good fatigue resistance and is not easily deformed or fractured.

[0131] In some embodiments, the connector and the breathable membrane are made of the same primary material. Because they share similar melting points or compatibilities, they can be bonded via thermal fusion. This facilitates the connection of the connector and the breathable membrane, while ensuring proper breathability. When selecting the breathable membrane material, the interface with the metal need not be considered. This broadens the range of breathable membrane materials available to meet the venting requirements of different batteries.

[0132] In some embodiments, the main materials of the connecting member and the breathable membrane may also be different.

[0133] In some embodiments of the present application, a method for preparing a breathable valve is further provided, specifically comprising:

[0134] Providing a metal sheet, the metal sheet comprising at least one first through hole;

[0135] Providing a connecting piece, and setting the connecting piece on the metal sheet, wherein the connecting piece includes at least one second through hole, and the first through hole is connected to the second through hole;

[0136] A breathable membrane is provided and arranged on the connector to cover the second through hole. The heat treatment temperature of the connector and the metal sheet is greater than or equal to the glass transition temperature of the breathable membrane, and the heat treatment temperature of the breathable membrane and the connector is lower than the glass transition temperature of the breathable membrane.

[0137] Among them, the through-hole forming method of the metal sheet can be punching forming. Punching forming is a metal forming method, which refers to arranging the required shape of the workpiece on the metal plate, and then using a steel mold to punch through the metal plate to cut out the required shape and cut off the excess part.

[0138] In some embodiments of the present application, the metal sheet also has a sink, and the forming method of the sink can be stamping. Stamping refers to the process of placing the metal plate into a stamping device and deforming the metal plate by heating or pressurizing to achieve the desired shape.

[0139] In some embodiments of the present application, the surface of the metal sheet may be subjected to nano-modification treatment to increase the interfacial bonding force between the metal sheet and the connector.

[0140] In some embodiments of the present application, the metal sheet and the connector are bonded via thermal lamination, and the breathable membrane and the connector are bonded via thermal fusion. The heat treatment temperature of the connector and the metal sheet is greater than or equal to the glass transition temperature of the breathable membrane, while the heat treatment temperature of the breathable membrane and the connector is less than the glass transition temperature of the breathable membrane. By providing the connector, and ensuring that the heat treatment temperature of the connector and the metal sheet is greater than or equal to the glass transition temperature of the breathable membrane, while the heat treatment temperature of the breathable membrane and the connector is less than the glass transition temperature of the breathable membrane, deformation caused by the direct lamination of the breathable membrane and the metal sheet can be reduced, further improving the deterioration of breathability caused by deformation, enhancing the structural stability and service life of the breathable valve, and thereby improving the reliability of the battery and electrical equipment.

[0141] In some embodiments of the present application, the breathable valve further includes a backing member, which is only assembled in the breathable valve and does not need to be fixedly connected to other structures of the breathable valve, such as forming a chemical bond.

[0142] According to some embodiments of the present application, a battery cell is provided, comprising a housing assembly, wherein a vent valve or a vent valve prepared by a vent valve preparation method described in any of the above embodiments is disposed within the housing assembly. This arrangement improves the structural stability and service life of the vent valve, thereby enhancing battery reliability.

[0143] In some embodiments, please refer to Figure 23, which is a schematic diagram of the exploded structure of the battery cell 20 of one or more embodiments. The battery cell 20 is the basic unit for realizing the mutual conversion of chemical energy and electrical energy in the battery. The battery cell 20 includes a top cover 21, a shell 22, a battery cell structure 23 and other functional components. The outer shell assembly includes a top cover 21 and a shell 22. The top cover 21 or the shell 22 has a vent 211 and a mounting sink 212 is arranged around the vent 211. The mounting sink 212 is located on the side of the top cover 21 or the shell 22 facing or away from the battery cell structure 23 of the battery cell 20. The vent valve 30 is arranged on the mounting sink 212.

[0144] The top cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the top cover 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 21 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved reliability. Functional components such as electrode terminals 21a and explosion-proof valves 21b can be provided on the top cover 21. The electrode terminals 21a can be used to electrically connect to the battery cell structure 23 for outputting or inputting electrical energy of the battery cell 20. The explosion-proof valve 21b can be provided on the top cover 21 or on the shell 22. For example, in Figure 23, the explosion-proof valve 21b is provided on the top cover 21. The explosion-proof valve 21b is configured to brake and release the internal pressure of the battery cell 20 in the event of thermal runaway. Specifically, when thermal runaway occurs within the battery cell 20, the explosion-proof valve 21b can brake and open to release gases and other gases generated within the battery cell 20 due to thermal runaway. The top cover 21 is also provided with a vent valve 30, a pressure relief mechanism, for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The top cover 21 or housing 22 has a vent hole 211 and a mounting recess 212 surrounding the vent hole 211. For example, in FIG23 , the vent hole 211 and the mounting recess 212 surrounding the vent hole 211 are provided on the top cover 21. The mounting recess 212 is located on the side of the top cover 21 or housing 22 facing or away from the battery cell structure 23 of the battery cell 20. Specifically, the welded surface between the vent valve 30 and the top cover 21 or housing 22 is located on the side facing or away from the battery cell structure 23 of the battery cell 20. The vent valve 30 is mounted on the mounting platform 212. The top cover 21 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating member can be disposed inside the top cover 21 to isolate the electrical components within the housing 22 from the top cover 21, thereby reducing the risk of short circuits. Exemplary materials include plastic and rubber.

[0145] The battery cell 20 may further include a shielding member 21c, which is mounted on the top cover 21 or the housing 22. The shielding member 21c is located on the side of the vent valve 30 facing away from the cell structure 23 and covers the vent valve 30. The shielding member 21c thus provides a certain degree of protection and shielding for the vent valve 30. This, on the one hand, reduces wear and damage to the vent valve 30 from external environments, and reduces the risk of impurities or particulate matter from the external environment entering the vent valve 30, thereby improving the service life of the vent valve 30. Furthermore, covering the vent valve 30 with the shielding member 21c enhances the aesthetics of the exterior surface of the battery cell 20. Furthermore, it facilitates connecting other components, such as detection elements, to the side of the shielding member 21c facing away from the vent valve 30, thereby reducing interference with the connection of other components, such as detection elements, in the area of ​​the top cover 21 or housing 22 where the vent valve 30 is located.

[0146] The battery's top cover is located at one end of the battery and is laser-welded to the battery casing, encapsulating and sealing the bare cell. A bare cell is a single electrochemical cell containing a positive and negative electrode and is generally not intended for direct use.

[0147] Through the above-mentioned arrangement, a new type of ventilation component, namely the ventilation valve, is added to the battery top cover, which can slowly discharge the gas inside the battery cell to the outside of the battery cell during its life cycle, thereby playing the role of exhausting and reducing pressure, and can effectively improve the long-term reliability of the battery cell; in addition, by arranging ventilation holes in the top cover or shell and installing sinks around the ventilation holes, the ventilation valve can be set at different parts of the battery cell according to the specific application scenario, thereby enhancing the flexibility of the ventilation valve setting and being able to meet different application needs.

[0148] The housing 22 is a component used to cooperate with the top cover 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell structure 23, electrolyte, and other components. The housing 22 and the top cover 21 can be independent components. An opening can be provided on the housing 22, and the internal environment of the battery cell 20 is formed by covering the opening with the top cover 21. Without limitation, the top cover 21 and the housing 22 can also be integrated. Specifically, the top cover 21 and the housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be encapsulated, the top cover 21 is then closed with the housing 22. The housing 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the battery cell structure 23. The housing 22 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0149] The cell structure 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more cell structures 23 may be contained in the housing 22. The cell structure 23 is mainly formed by winding or stacking cathode sheets and anode sheets, and a separator is usually provided between the cathode sheets and the anode sheets. The parts of the cathode sheets and the anode sheets with active materials constitute the main body of the cell structure, and the parts of the cathode sheets and the anode sheets without active materials each constitute a tab. The cathode tab and the anode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the cathode active material and the anode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0150] The cathode electrode generally includes a cathode current collector and a cathode film layer arranged on the cathode current collector.

[0151] The cathode current collector generally adopts a conventional metal foil or a composite current collector (a metal material can be disposed on a polymer substrate to form a composite current collector). As an example, the cathode current collector can adopt aluminum foil.

[0152] The cathode film layer includes cathode active materials as well as a binder, a conductive agent and other optional additives.

[0153] As an example, the cathode active material may include one or more of lithium transition metal oxides, lithium phosphates with an olivine structure and their respective modified compounds, transition metal oxides, polyanionic compounds, and Prussian blue analogs. Examples of lithium transition metal oxides may include one or more of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, and their modified compounds. Examples of lithium phosphates with an olivine structure may include one or more of lithium iron phosphate, a composite material of lithium iron phosphate and carbon, lithium manganese phosphate, a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, and their modified compounds. The modified compounds of the above materials may be doping modification and / or surface coating modification of the materials. These materials can all be obtained through commercial channels.

[0154] As an example, the conductive agent may be one or more of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, Super P (SP), graphite, and carbon nanofibers.

[0155] As an example, the binder can be one or more of styrene-butadiene rubber (SBR), water-based acrylic resin, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer (EVA), polyacrylic acid (PAA), carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA) and polyvinyl butyral (PVB).

[0156] As an example, other optional auxiliary agents may be thickening and dispersing agents (such as sodium carboxymethyl cellulose CMC-Na), and PTC thermistor materials.

[0157] The anode electrode generally includes an anode current collector and an anode film layer disposed on the anode current collector.

[0158] The anode current collector may be a conventional metal foil or a composite current collector (for example, a metal material may be disposed on a polymer substrate to form a composite current collector). As an example, the anode current collector may be a copper foil.

[0159] The anode film layer includes an anode active material, a binder, a conductive agent and other optional additives.

[0160] The anode active material may include one or more of silicon-based materials, silicon-carbon materials, carbon materials, and selenium-based materials. Specifically, it includes one or more of artificial graphite, natural graphite, hard carbon, soft carbon, silicon-based materials and selenium-based materials. Silicon-based materials can be selected from one or more of elemental silicon, silicon oxide compounds (such as silicon monoxide), silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Selenium-based materials can be selected from one or more of elemental selenium, selenium oxide compounds, and selenium alloys. These materials can all be obtained through commercial channels. In some embodiments of the present application, the design concept of active density is also applicable to sodium batteries, or in other words, the type of battery is not limited. The present application does not limit the selection and matching of electrode materials. Different combinations of anode and cathode materials may have different active density control standards.

[0161] As an example, the conductive agent may be one or more of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphite, and carbon nanofibers.

[0162] As an example, the binder may be one or more of styrene-butadiene rubber (SBR), water-based acrylic resin, polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-vinyl acetate copolymer (EVA), polyvinyl alcohol (PVA) and polyvinyl butyral (PVB).

[0163] As an example, other optional auxiliary agents may be thickening and dispersing agents (such as sodium carboxymethyl cellulose CMC-Na), and PTC thermistor materials.

[0164] In one embodiment, the cathode active material, the anode active material, the binder, and the conductive agent are mixed in proportion to obtain cathode slurry and anode slurry, and then the cathode slurry and anode slurry are coated on the corresponding current collectors respectively, and dried after coating to obtain cathode and anode pole pieces.

[0165] Furthermore, the battery cell also includes a separator and an electrolyte.

[0166] The separator is placed between the cathode and anode electrodes. As an insulating layer, it effectively prevents contact between the cathode and anode electrodes, which could cause an internal short circuit, while allowing electrolyte ions to pass smoothly. The performance of the separator determines the battery's interface structure and internal resistance, directly affecting the battery's mechanical strength and reliability.

[0167] The specific type of separator material is not limited. Any material known in the art for battery separators can be used, and those skilled in the art can select the material based on their needs. For example, the separator material can include one or more of polyolefins, fluoropolymers, cellulose, and fiberglass. Polyolefins can include, but are not limited to, one or more of polypropylene and polyethylene. All of these materials are commercially available.

[0168] In some embodiments, the isolation membrane includes a base membrane and a coating located on one side / both sides of the base membrane, and the coating includes a filler. The filler may include an inorganic material, a polymer adhesive, and a dispersant. The inorganic material includes one or more of boehmite and silica, and the polymer adhesive material includes one or more of PVDF (polyvinylidene fluoride) and polystyrene-acrylate; the dispersant material includes polyvinyl alcohol, etc. By providing a coating on one side / both sides of the isolation membrane, the performance of the isolation membrane can be improved and regulated. The performance of the isolation membrane can be regulated by regulating the type of filler. For example, a filler with heat insulation and heat resistance can be added to improve the heat resistance of the isolation membrane. The specific type of the base membrane material is not limited, and can include one or more of polyethylene, polypropylene and glass fiber. These materials can be obtained through commercial channels.

[0169] The electrolyte plays the role of conducting ions between the cathode electrode and the anode electrode, and may include electrolyte salts and solvents.

[0170] As an example, the electrolyte salt can be selected from one or more of lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalatoborate (LiDFOB), lithium dioxalatoborate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorobis(oxalatophosphate) (LiDFOP) and lithium tetrafluorooxalatophosphate (LiTFOP).

[0171] As an example, the solvent may be selected from ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl darbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), n-propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), n-propyl propionate (NP), propylene glycol (PEG), propylene glycol (PP), propylene glycol (C1), propylene glycol (C2), propylene glycol (C3), propylene glycol (C4), propylene glycol (C5), propylene glycol (C6), propylene glycol (C7), propylene glycol (C8), propylene glycol (C9), propylene glycol (D1), propylene glycol (D2), propylene glycol (D3), propylene glycol (D4), propylene glycol (D5), propylene glycol (D6), propylene glycol (D7), propylene glycol (D8), propylene glycol (D9), propylene glycol (D10), propylene glycol (D11), propylene glycol (D12), propylene glycol (D13), propylene glycol (D14), propylene glycol (D15), propylene glycol (D16), propylene glycol (D17), propylene glycol (D18), propylene glycol (D19), propylene glycol (D20), propylene glycol (D21), propylene glycol (D22), propylene glycol (D23), propylene glycol (D24), propylene glycol (D25), propylene glycol (D26), propylene glycol (D27), propylene glycol (D28), propylene glycol (D29), propylene glycol (D31), propylene glycol (D32), propylene glycol (D33), propylene glycol (D34), propylene glycol (D35), propylene glycol (D36), propylene glycol (D37), propylene glycol (D38), propylene glycol (D39), propylene One or more of the group consisting of propionate (PP), methyl butyrate (Methyl Butyrate MB), ethyl butyrate (Ethyl Butyrate, EB), 1,4-butyrolactone (1,4-Butyrolactone, GBL), tetramethylene sulfone (SF), dimethyl sulfone (Methyl Sulfone, MSM), methyl ethyl sulfone (Methyl Ethyl Sulfone, EMS) and diethyl sulfone (Diethyl Sulfone, ESE).

[0172] In some embodiments, the electrolyte further includes additives. For example, the additives may include anode film-forming additives, cathode film-forming additives, or additives capable of improving certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high-temperature performance, and additives that improve battery low-temperature performance.

[0173] According to some embodiments of the present application, a battery 100 is provided. The battery 100 includes the vent valve 30 described in any of the above embodiments, or the vent valve 30 prepared by the vent valve preparation method, or the battery cell 20 described in any of the above embodiments. The battery 100 can be a battery pack or a battery module. Referring to Figure 24 , in the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 20 being connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single unit and housed within the housing 10. The battery 100 can also include other structures. For example, the battery 100 can include a busbar component for electrically connecting the multiple battery cells 20.

[0174] In some embodiments, the battery 100 of the present application includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. See FIG24 , which illustrates an exploded view of the battery structure according to one embodiment. The housing 10 provides a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, overlapping the open side of the second portion 12, so that the first and second portions 11 and 12 together define a storage space. Alternatively, the first and second portions 11 and 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first and second portions 11 and 12 can have various shapes, such as a cylinder or a rectangular parallelepiped. Each battery cell 20 may be a battery, such as a lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or an aluminum-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or have other shapes.

[0175] Battery manufacturing methods include laminated and wound types. Laminated batteries offer uniform current collection, low internal resistance, and high specific power, but they require extremely high mold precision, high equipment investment, and a complex process, resulting in low production efficiency. Wound batteries are simple to manufacture, with moderate equipment precision requirements during the production and assembly processes. They offer high production efficiency and low costs. In terms of performance, wound batteries offer excellent high and low temperature performance, extremely fast charging, an extremely long lifespan, stable high output voltage, a sturdy structure, and strong shock resistance.

[0176] The battery disclosed in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical devices may be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0177] The energy storage system can be a hydropower, thermal, wind power, solar power station or other energy storage power supply system.

[0178] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0179] Please refer to Figure 25, which is a schematic diagram of the structure of an electric device according to an embodiment of the present application. The electric device may be a vehicle 1000, a drone, an airplane, etc. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0180] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0181] The above-mentioned electrical equipment and energy storage systems are also within the protection scope of this application.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A breathable valve, in, include: A metal sheet, wherein the metal sheet comprises at least one first through hole; A connecting member, the connecting member comprising at least one second through hole, the connecting member being arranged on the metal sheet, the first through hole being in communication with the second through hole; A breathable membrane is disposed on the connecting member and covers the second through hole.

2. The breathable valve according to claim 1, in, The breathable valve further includes a backing member, which is made of breathable material. The connecting member surrounds the backing member, and the backing member is at least partially located in the second through hole.

3. The breathable valve according to claim 2, in, The metal sheet includes a first sink, the first through hole is located on the first sink, and the backing member is at least partially disposed on the first sink and covers the first through hole.

4. The breathable valve according to claim 3, in, The connecting member is at least partially located on the first sink, and the surface of the backing member facing the breathable membrane is flush with the surface of the connecting member facing the breathable membrane.

5. The breathable valve according to claim 4, in, The connecting member protrudes from the first sink, the depth of the first sink is less than the thickness of the backing member, and the surface of the backing member facing the breathable membrane and the surface of the connecting member facing the breathable membrane are located between the surface of the metal sheet facing the breathable membrane and the breathable membrane.

6. The breathable valve according to claim 4, in, The connecting members are all located in the first sink, and the depth of the first sink is greater than or equal to the thickness of the backing member.

7. The breathable valve according to claim 6, in, The breathable membrane is entirely located in the first sink, and the depth of the first sink is greater than or equal to the sum of the thickness of the backing member and the breathable membrane.

8. The breathable valve according to claim 3, in, The metal sheet also includes a second sinker, the depth of the second sinker is greater than the depth of the first sinker, the second sinker is located on the bottom wall of the first sinker, the first sinker surrounds the second sinker, and the backing member is at least partially disposed on the second sinker and covers the first through hole.

9. The breathable valve according to claim 8, in, The connecting member is at least partially located on the first sink, the backing member is located in the second through hole, and the surface of the backing member facing the breathable membrane is flush with the surface of the connecting member facing the breathable membrane.

10. The breathable valve according to claim 9, in, The connecting member protrudes from the first sink, the depth of the first sink is less than the thickness of the connecting member, the depth of the second sink is less than the thickness of the backing member, and the surface of the backing member facing the breathable membrane and the surface of the connecting member facing the breathable membrane are located between the surface of the metal sheet facing the breathable membrane and the breathable membrane.

11. The breathable valve according to claim 9, in, The connecting members are all located in the first sink, and the depth of the first sink is greater than or equal to the thickness of the connecting members.

12. The breathable valve according to claim 11, in, The breathable membrane is entirely located in the first sink, and the depth of the first sink is greater than or equal to the sum of the thickness of the connecting member and the thickness of the breathable membrane.

13. The breathable valve according to claim 2, in, The backing member and the connecting member are both arranged on the surface of the metal sheet, and the backing member covers the first through hole.

14. The breathable valve according to claim 1, in, The connecting piece is located on the surface of the metal sheet, and the breathable membrane is located on the surface of the connecting piece away from the metal sheet.

15. The breathable valve according to claim 1, in, The connecting member is located on the surface of the metal sheet, the connecting member has a third sinking platform, the second through hole is located on the third sinking platform, and the breathable membrane is arranged on the third sinking platform and is located between the connecting member and the metal sheet.

16. The breathable valve according to claim 1, in, The metal sheet comprises a first sink, the first through hole is located on the first sink, the connecting member is at least partially located on the first sink, and the breathable membrane is located on a surface of the connecting member away from the first through hole.

17. The breathable valve according to claim 16, in, The connecting member protrudes from the first sinking platform, and the depth of the first sinking platform is less than the thickness of the connecting member.

18. The breathable valve according to claim 16, in, The connecting members are all located in the first sink, and the depth of the first sink is greater than or equal to the thickness of the connecting members.

19. The breathable valve according to claim 18, in, The breathable membrane is entirely located in the first sink, and the depth of the first sink is greater than or equal to the sum of the thickness of the connecting member and the breathable membrane.

20. The breathable valve according to any one of claims 1 to 19, in, The thickness of the connecting piece is 50-1000 μm.

21. The breathable valve according to any one of claims 1 to 20, in, The material of the connecting piece includes polypropylene polymer material and / or modified polypropylene polymer material. The modified polypropylene polymer material is a polypropylene polymer material having polar functional groups on the surface. The polar functional groups include -OH, -COOH and / or -NH 2 Optionally, the materials of the breathable membrane and the connecting piece are the same or different.

22. A method for preparing the breathable valve according to any one of claims 1 to 21, include: Providing a metal sheet, wherein the metal sheet comprises at least one first through hole; Providing a connecting member, and setting the connecting member on the metal sheet, wherein the connecting member comprises at least one second through hole, and the first through hole is connected to the second through hole; A breathable membrane is provided, and the breathable membrane is arranged on the connecting member and covers the second through hole. The heat treatment temperature of the connecting member and the metal sheet is greater than or equal to the glass transition temperature of the breathable membrane, and the heat treatment temperature of the breathable membrane and the connecting member is less than the glass transition temperature of the breathable membrane.

23. A battery cell, in, include: Housing components; The breathable valve according to any one of claims 1 to 21 or the breathable valve prepared by the method for preparing a breathable valve according to claim 22, wherein the breathable valve is arranged in the shell component.

24. The battery cell according to claim 23, in, The shell assembly includes a top cover and a shell, the top cover or shell has a vent hole and a mounting sink is arranged around the vent hole, the mounting sink is located on the side of the top cover or shell facing or away from the battery cell structure of the battery cell, and the vent valve is arranged on the mounting sink.

25. A battery, in, It comprises the air permeable valve as described in any one of claims 1 to 21, the air permeable valve prepared by the method for preparing the air permeable valve as described in claim 22, or the battery cell as described in claim 23 or 24.

26. An electrical device, in, Comprising the battery of claim 25.

Images