Breathable valve, battery monomer, battery and electric equipment

Abstract

The utility model discloses a ventilation valve, a battery monomer, a battery pack and electric equipment. The ventilation valve comprises a metal sheet, a first through hole, a second through hole and a valve body, the connecting piece at least comprises a second through hole, the connecting piece is arranged on the metal sheet, and the first through hole is communicated with the second through hole; and the breathable film is arranged on the connecting piece and covers the second through hole. Through the arrangement of the connecting piece, deformation generated in the machining process of the breathable film can be reduced, and poor breathability caused by deformation is further prevented, so that the structural stability of the breathable valve is improved, the service life of the breathable valve is prolonged, meanwhile, the sealing performance of the breathable valve is improved, and the selection range of breathable film materials can be widened.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a vent valve, a battery cell, a battery and an electrical device. Background Art

[0002] Batteries will generate gas during use, such as hydrogen from lead-acid batteries. Gas will increase the internal pressure of the battery, affecting the normal operation of the battery, and some gases may even burn and explode, posing hidden dangers. Therefore, how to improve the reliability of batteries is an urgent problem to be solved. Utility Model Content

[0003] In view of the technical problems existing in the background technology, the present application provides a vent valve, a battery cell, a battery and an electrical device, aiming to improve the reliability of the battery and the electrical device.

[0004] In the first aspect, the present application provides a breathable valve, comprising: a metal sheet, the metal sheet comprising at least one first through hole; a connector, the connector comprising at least one second through hole, the connector being arranged on the metal sheet, the first through hole being connected to the second through hole; and a breathable membrane, the breathable membrane being arranged on the connector and covering the second through hole. By providing the connector, the deformation generated during the direct compounding of the breathable membrane and the metal sheet can be reduced, including physical deformation caused by stretching and deformation caused by material degeneration caused by high temperature, the problem of deterioration of the breathability performance caused by deformation can be improved, the structural stability and service life of the breathable valve can be improved, and the reliability of the battery and electrical equipment can be improved.

[0005] In the technical solution of the embodiment of the present application, the breathable valve further includes a backing member, the backing member is a breathable material, the connecting member surrounds the backing member, and the backing member is at least partially located in the second through hole. The backing member can support the breathable membrane, so that the breathable membrane is not easily deformed, which is conducive to improving the structural stability and service life of the breathable valve.

[0006] In some embodiments, the metal sheet includes a 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. By providing the first sink, 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 the backing members and the connecting member of different thicknesses during the assembly process is improved; and the first sink can accommodate the backing member and the connecting member, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0007] 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, 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.

[0008] In some embodiments, the connector protrudes from the first depression, the depth of the first depression 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. In this case, 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.

[0009] 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 backing member. At this time, 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 sink can accommodate all the connectors, further reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0010] In some embodiments, the air permeable membrane is completely 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 air permeable membrane. At this time, the surface of the air permeable membrane away from the backing member is located in the space of the first sink, or is flush with the surface of the metal sheet away from the first through hole. The first sink can accommodate all the connectors and all the air permeable membranes, which can further reduce the thickness of the air valve and reduce the space occupied by the air valve in the battery.

[0011] In some embodiments, the metal sheet further 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. By providing the first sinker and the second sinker, and providing the backing member on the second sinker, the thickness of the air valve can be further reduced, and the space occupied by the air valve in the battery can be reduced.

[0012] 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, when the breathable membrane and the connector are thermally compounded, 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 the water permeability and air permeability can be reduced, thereby improving the structural stability and service life of the breathable valve, and thus improving the reliability of batteries and electrical equipment.

[0013] In some embodiments, the connector protrudes from the first depression, the depth of the first depression is less than the thickness of the connector, the depth of the second depression 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 height difference between the surfaces of the two facing the breathable membrane can be improved by setting the first depression and the second depression, 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 compounded, the problem of local stretching and thinning of the breathable membrane due to the 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, thereby improving the structural stability and service life of the breathable valve, thereby improving the reliability of the battery and electrical equipment, and at the same time, reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0014] 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. At this time, 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 air valve is reduced, and the space occupied by the air valve in the battery is reduced; at the same time, the flushing of the two can reduce the local stretching and thinning of the breathable membrane caused by the internal stress generated by stretching, the reduction of the mechanical strength of the breathable membrane, and the change of the water permeability and air permeability, thereby improving the structural stability and service life of the air valve, and thus improving the reliability of the battery and electrical equipment.

[0015] In some embodiments, 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 connector and the thickness of the breathable membrane. By placing the breathable membrane entirely in the first sink, the thickness of the breathable valve can be further reduced, thereby reducing the space occupied by the breathable valve in the battery.

[0016] In some embodiments, 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. The two are directly arranged on the surface of the metal sheet, which reduces the secondary processing of the metal sheet and saves the operation process.

[0017] 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. By providing the connector, the deformation caused by 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 the battery and the electrical equipment can be improved.

[0018] In some embodiments, the connector is located on the surface of the metal sheet, the connector has a third sink, the second through hole is located on the third sink, and the breathable membrane is disposed on the third sink, between the connector and the metal sheet. By providing the 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 the battery and electrical equipment can be improved.

[0019] In some embodiments, the metal sheet includes a first sink, the first through hole is located on the first sink, the connector is at least partially located on the first sink, and the breathable membrane is located on a surface of the connector away from the first through hole. By providing the first sink, at least part of the connector can be accommodated, thereby reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0020] In some embodiments, the connector protrudes from the first depression, and the depth of the first depression is less than the thickness of the connector. In this case, the first depression 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.

[0021] 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. By arranging all the connectors in the first sink, the first sink can accommodate all the connectors, further reducing the thickness of the vent valve and reducing the space occupied by the vent valve in the battery.

[0022] In some embodiments, 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. By arranging the breathable membrane entirely in the first sink, the first sink can accommodate all the connectors and all the breathable membranes, further reducing the thickness of the breathable valve and reducing the space occupied by the breathable valve in the battery.

[0023] In some embodiments, the thickness of the connector is 50-1000 μm. The above configuration is conducive to improving the bonding strength between the connector and the metal sheet, and between the connector and the breathable membrane, and can also reduce the thickness of the breathable valve, thereby reducing the space occupied by the breathable valve in the battery.

[0024] In some embodiments, the material of the connector includes a polypropylene polymer material and / or a modified polypropylene polymer material, wherein the modified polypropylene polymer material is a polypropylene polymer material having a polar functional group on the surface, wherein the polar functional group includes -OH, -COOH and / or -NH2, and optionally, the material of the breathable membrane and the connector is the same or different. Through the above arrangement, since the density of the polypropylene polymer material is low, it is beneficial to reduce the weight of the breathable valve; in addition, through the arrangement of the polar functional group, a chemical bond can be formed between the connector and the metal sheet, which is beneficial to improve the interface bonding strength between the two, improve the structural stability and service life of the breathable valve, and thus improve the reliability of the battery and electrical equipment.

[0025] In the second aspect, the present application provides a method for preparing a breathable valve, including: 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 setting 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, the deformation generated during the direct compounding of the breathable membrane and the metal sheet can be reduced, the problem of deterioration of the breathable performance caused by the deformation can be further improved, the structural stability and service life of the breathable valve can be improved, and the reliability of the battery and electrical equipment can be improved.

[0026] In a third aspect, the present application provides a battery cell, comprising: a housing assembly; a vent valve or a vent valve prepared by the vent valve preparation method described in any one of the above items, arranged on the housing assembly. The above arrangement improves the structural stability and service life of the vent valve, thereby improving the reliability of the battery.

[0027] 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 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. By arranging the vent hole and the mounting sink around the vent hole on the top cover or shell, the vent valve can be arranged at different parts of the battery cell according to the specific application scenario, which enhances the flexibility of the vent valve arrangement and can meet different application needs.

[0028] In a fourth aspect, the present application provides a battery, comprising any of the above-mentioned vent valves or the vent valve prepared by the vent valve preparation method or the above-mentioned battery cell. The above-mentioned configuration improves the structural stability and service life of the vent valve, thereby improving the reliability of the battery.

[0029] 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 air-permeable valve are improved, thereby improving the reliability of the battery.

[0030] 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

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0032] Figure 1 is a schematic diagram of the structure of a breathable valve according to one or more embodiments of the present application;

[0033] Figure 2 yes Figure 1 A cross-sectional view of the vent valve shown;

[0034] Figure 3 It is a schematic diagram of the structure of a metal sheet of a breathable valve in one or more embodiments of the present application;

[0035] Figure 4 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0036] Figure 5 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0037] Figure 6 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0038] Figure 7 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0039] Figure 8 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0040] Fig. 9 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0041] Fig.10 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0042] Fig.11 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0043] Fig.12 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0044] Fig.13 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0045] Fig.14 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0046] Fig.15 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0047] Fig.16 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0048] Fig.17 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0049] Fig.18 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0050] Fig.19 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0051] Fig. 20 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0052] Fig.21is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0053] Fig. 22 is a schematic cross-sectional structure diagram of a breathable valve according to one or more embodiments of the present application;

[0054] Fig.23 is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0055] Fig.24 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0056] Fig.25 It is a structural schematic diagram of an electrical equipment according to an embodiment of the present application.

[0057] In the attached figure:

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

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

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, 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), and similarly, "multiple groups" refers to more than two (including two groups), and "multiple pieces" refers to more than two (including two pieces), unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood 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 the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after 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 a range format is for convenience and brevity and should be flexibly interpreted 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 there is no special explanation, all steps of the present application can 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 be steps (a) and (b) performed simultaneously in parallel. For example, the method may also 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 one of the key devices of new energy technologies and are widely used in the fields of power supply for electronic equipment, power source for electric vehicles, and energy storage and regulation of renewable energy. In the use of batteries, reliability is a very important consideration. Batteries with high reliability can reduce losses caused by accidents. In addition, the reliability of batteries directly affects the breadth of their application areas. Batteries with good reliability can be promoted and used in more important application scenarios with higher reliability requirements. Therefore, the research and development of high-reliability batteries is the key to the further development of the battery industry.

[0067] The gases generated by batteries during use mainly come from the following sources: First, the redox decomposition of the electrolyte. With the change of the voltage of the positive and negative electrodes, the electrolyte tends to be oxidized / reduced on the surface of the positive / negative electrodes, resulting in gas generation; second, the residual impurities in the positive electrode material will decompose and produce gas during the battery cycle; third, the residual water caused by insufficient drying and the water generated by the side reaction will be electrolyzed when encountering electric current to generate hydrogen and oxygen; fourth, when the battery is overcharged or over-discharged, the decomposition of chemical materials will produce acetylene, carbon monoxide and other gases. The accumulation of these gases will cause the internal pressure of the battery to increase, which will not only cause the battery to swell and the electrolyte to overflow, but may also cause an explosion accident in severe cases.

[0068] In summary, the development of a highly reliable battery exhaust device is of great significance to ensuring the normal service life of the battery, improving the battery's charge and discharge performance, and reducing the occurrence of 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 necessary to set a vent valve for the battery, which can timely discharge various gases generated inside the battery to ensure the normal operation of the battery. The vent valve currently used in the battery will deform with the increase of usage time, affecting the exhaust function. The reason for this phenomenon is that in the vent valve currently used in the battery, the vent membrane that performs the exhaust function also performs the function of sealing with the metal sheet. When the vent membrane and the metal sheet are directly compounded, the temperature during the processing may reach the glass transition temperature of the vent membrane, causing the material structure of the vent membrane to change, resulting in deformation of the vent membrane and deterioration of the venting performance.

[0070] In order to solve the above problems, the present application provides a breathable valve. Figure 1 and Figure 2 The breathable valve 30 includes a metal sheet 31, a breathable membrane 32 and a connecting member 33. The metal sheet 31 includes at least one first through hole 310. The connecting member 33 includes at least one second through hole 330. The connecting member 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 connecting member 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 that are arranged opposite to each other. The breathable membrane 32 has a third surface 32a and a fourth surface 32b that are arranged opposite to each other. The connecting member 33 has a fifth surface 33a and a sixth surface 33b that are arranged opposite to each other. The fifth surface 33a of the connecting member 33 is fixedly connected to the first surface 31a of the metal sheet 31. The sixth surface 33b of the connecting member 33 is fixedly connected to the third surface 32a of the breathable membrane 32.

[0072] The breathable valve 30 is a protective component that can be assembled and disassembled, and is formed by combining a breathable film with a valve body by injection molding, welding, bonding, hot melting, etc., and is used to control the internal gas of the battery, such as carbon dioxide, hydrogen, methane, etc. During the life cycle, when the internal pressure of the battery increases to a certain value, the breathable valve 30 allows the internal gas of the battery to be discharged from the inside, which is conducive to reducing the internal pressure of the battery and effectively improving the long-term reliability of the battery. When the internal pressure of the battery is reduced, the breathable valve 30 can prevent external air, moisture and dust from entering the battery.

[0073] Among the various components of the vent valve 30, the metal sheet 31 is the medium for connecting the vent valve 30 with the top cover of the battery cell, and the connection method includes laser welding, etc. At the same time, the metal sheet 31 plays a supporting role for the vent membrane. Figure 3The metal sheet 31 is provided with at least one first through hole 310 as a release channel for the gas inside the battery. The shape of the first through hole 310 includes a circular, square, elliptical and other geometric shapes. The metal sheet 31 can also be provided with multiple through holes, and 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 compressed and elastically expanded 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 dust impurity macromolecules cannot pass. 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 certain mechanical strength and elasticity.

[0075] In the present application, in addition to the metal sheet 31 and the breathable membrane 32, a connecting member 33 is added. The connecting member 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 geometric shape such as a circle, a square, an ellipse, etc. The outer contour of the connecting member 33 is a geometric shape such as a circle, a square, an ellipse, etc. The connecting member 33 connects the breathable membrane 32 and the metal sheet 31, and has both sealing and connecting functions.

[0076] During the manufacturing process of the breathable valve 30, the connector 33 is firstly thermally compounded with the metal sheet 31, and then the breathable membrane 32 is thermally fused with the connector 33. Compared with the connection conditions of the metal sheet 31 and the connector 33, the connection conditions of the breathable membrane 32 and the connector 33 are milder. In the absence of the connector 33, the breathable membrane 32 and the metal sheet 31 are directly fixedly connected. In this process, on the one hand, the stretching during the compounding process causes the breathable membrane to undergo physical deformation; on the other hand, when the temperature exceeds the glass transition temperature of the breathable membrane 32, the molecular chain segments inside the polymer material begin to move, the deformation gradually increases and cannot be restored, and thus the breathable membrane 32 will deform. Taking polytetrafluoroethylene as an example, when the temperature exceeds 327°C, the stability of the structure and performance of polytetrafluoroethylene begins to decline, which will eventually lead to the deterioration of the sealing of the breathable valve and the change of the breathability function of the breathable membrane. 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 the 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 a 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 part refers to the part in the breathable valve that supports the breathable membrane, making it less likely for the breathable membrane to deform. The backing part has better air permeability than the breathable membrane, so it will not affect the breathability of the breathable membrane; it has stable chemical properties, is resistant to acid and alkali corrosion, and is resistant to weather, and can adapt to harsh operating environments; the melting point is greater than 140°C, and it is not easy to deform when the battery temperature is high, and it supports and fixes the breathable membrane; the thickness is between 0.2-2mm, taking into account the support role and the rationality of the thickness of the breathable valve; the material selection is rich, including porous polymers such as polypropylene, polyamide, polytetrafluoroethylene, and polyperfluoroethylene propylene, and can also be porous materials of metal organic frameworks, as well as porous materials of carbon membranes and ceramics.

[0079] The shape and size of the backing piece are consistent with the inner contour of the connector, and the outer edge of the backing piece is close to the inner edge of the connector without any gap. Through this arrangement, when the breathable membrane and the connector are thermally laminated, the problem of the breathable membrane collapsing or deforming at the edge gap between the connector and the backing piece due to the gap between the breathable membrane and the backing piece is reduced, thereby improving the performance stability of the breathable membrane, improving the structural stability and service life of the breathable valve, and further improving the reliability of the battery and electrical equipment.

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

[0081] In one embodiment, the connecting member 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 connecting member 33 facing the breathable membrane 32. In some embodiments, the backing member 34 has a seventh surface 34a and an eighth surface 34b that are arranged opposite to 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 likely to deform during operation, which is beneficial to improving the structural stability and service life of the breathable valve. In addition, the step between the backing member and the connector is improved or eliminated. When the breathable membrane and the connector are thermally laminated, the problem of local stretching and thinning of the breathable membrane due to the 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. The structural stability and service life of the breathable valve are improved, thereby improving the reliability of batteries and electrical equipment.

[0083] By setting the 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 to backing members and connectors of different thicknesses during the assembly process, and at the same time, when the breathable membrane and the connector are thermally compounded, 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 is reduced, thereby improving the structural stability and service life of the breathable valve, and thus improving the reliability of the battery and electrical equipment. In addition, the first sink set 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 may also be directly disposed on the surface of the metal sheet 31. Figure 4 , 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 large thickness differences, the height difference between the two surfaces facing the breathable membrane is improved by setting the backing member on the first sinker, 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 compounded, 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 sinker set in the metal sheet can accommodate the backing member or 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.

[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, and 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 at 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 and cover the backing member 34.

[0087] For thicker backing members and connectors, by arranging the connector and the backing member on the first sinker, the first sinker arranged 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, please continue to refer to Figures 6 to 9 The connecting member 33 is entirely located in the first sink 311 , and the depth D1 of the first sink 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 depression 311 is equal to the thickness H of the backing member 34. Figure 6 , the connecting member 33 and the backing member 34 are both located on the first sinking platform 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 sinking platform 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 connecting member 33, covering the backing member 34. By locating the connecting member and the backing member 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 among the three. When the breathable membrane and the connecting member are thermally compounded, the problems of local stretching and thinning of the breathable membrane due to 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 situation is that the depth D1 of the first depression 311 is greater than the thickness H of the backing member 34. Figures 7 to 9 The connecting member 33 and the backing member 34 are both located on the first sinking platform 311. At least part of the breathable membrane 32 is located in the space of the first sinking platform 311. Figure 7 In some embodiments, the surface of the breathable membrane 32 away from the backing member 34 protrudes beyond the surface of the metal sheet 31 away from the first through hole 310 .

[0091] In one embodiment, the air permeable membrane 32 is entirely located in the first sink 311, and the depth D1 of the first sink 311 is greater than or equal to the sum of the thicknesses of the backing member 34 and the air permeable membrane 32 (H+A). 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; Fig. 9 In some embodiments, the surface of the air permeable membrane 32 away from the backing member 34 is located in the space of the first sink 311 .

[0092] exist Figures 7 to 9 The fifth surface 33a of the connecting member 33 is fixedly connected to the first sinking platform 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 connecting member 33, covering the backing member 34.

[0093] like Figure 7 , the fourth surface 32 b of the breathable membrane 32 protrudes from the first surface 31 a of the metal sheet 31 .

[0094] like Figure 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] like Fig. 9 , the fourth surface 32 b of the air permeable membrane 32 is located in the space of the first sink 311 .

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

[0097] In some embodiments, see Figures 10 to 14The metal sheet 31 further includes a second sink 312, the depth D2 of the second sink 312 is greater than the depth D1 of the first sink 311, the second sink 312 is located on the bottom wall of the first sink 311, the first sink 311 surrounds the second sink 312, and the backing member 34 is at least partially disposed on the second sink 312 and covers 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 passes 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 air valve can be further reduced, and the space occupied by the air valve in the battery can be reduced.

[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 sinker and the first sinker respectively, the height difference between the surfaces of the backing members and the connecting member facing the breathable membrane at different heights is reduced, thereby improving the adaptability to backing members and connecting members of different thicknesses during the assembly process; 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 permeability 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.

[0101] In one embodiment, please continue to refer to Fig.10 , 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 connecting member 33, the depth D2 of the second depression 312 is less than the thickness H of the backing member 34, and 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 fifth surface 33a of the connecting member 33 is fixedly connected to the first depression surface 311a of the first depression 311, and the sixth surface 33b of the connecting member 33 protrudes from the first surface 31a of the metal sheet 31. The backing member 34 is accommodated in the second depression 312 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.

[0102] For backing members and connectors that are thick and have a large thickness difference, the first sinker and the second sinker can improve the height difference between the two surfaces 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 compounded, 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 is reduced, thereby improving the structural stability and service life of the breathable valve, and thus improving the reliability of the battery and electrical equipment. In addition, for backing members and connectors with larger thickness, the first sinker and the second sinker set in the metal sheet can accommodate the connector and the 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, please refer to Figures 11 to 14 , the connecting member 33 is entirely located in the first sink 311 , and the depth D1 of the first sink 311 is greater than or equal to the thickness h of the connecting member 33 .

[0104] In the first case, the depth D1 of the first depression 311 is equal to the thickness h of the connecting member 33, and the depth D2 of the second depression 312 is equal to the thickness H of the backing member 34. Fig.11 , the surface of the metal sheet 31 facing the breathable membrane 32, the surface of the connecting member 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 connecting member 33 and the first sinking table surface 311a of the first sinking table 311 are fixedly connected, and the first surface 31a of the metal sheet 31, the sixth surface 33b of the connecting member 33, and the eighth surface 34b of the backing member 34 are all flush. The backing member 34 is accommodated in the second sinking table 312 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.

[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 among the three is improved. When the breathable membrane and the connecting piece are thermally compounded, the local stretching and thinning of the breathable membrane caused by the internal stress generated by stretching, the mechanical strength of the breathable membrane is reduced, and the water permeability and air permeability are changed. The structural stability and service life of the breathable valve are improved, thereby improving the reliability of batteries and electrical equipment.

[0106] The second case is that the depth D1 of the first depression 311 is greater than the thickness h of the connecting member 33, and the depth D2 of the second depression 312 is greater than the thickness H of the backing member 34. Fig.12At this time, part of the breathable membrane 32 is located in the space of the first sink 311 , and the surface of the breathable membrane 32 away from the backing member 34 protrudes from the surface of the metal sheet 31 away from the first through hole 310 .

[0107] In one embodiment, see Fig.13 and Fig.14 , the air-permeable membrane 32 is completely located in the first sink 311, and the depth D1 of the first sink 311 is greater than or equal to the sum of the thickness of the connecting member 33 and the thickness of the air-permeable membrane 32 (h+A). Fig.13 , 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; in some embodiments, such as Fig.14 The surface of the air permeable membrane 32 away from the backing member 34 is located in the space of the first sinking platform 311.

[0108] In the above embodiment, the fifth surface 33a of the connecting member 33 is fixedly connected to the first sinking platform surface 311a of the first sinking platform 311, and the sixth surface 33b of the connecting member 33 is located in the space of the first sinking platform 311. The backing member 34 is accommodated in 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 connecting member 33, and covers the backing member 34.

[0109] like 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] like 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] like Fig.14 , the fourth surface 32 b of the air permeable 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. Fig.15 The breathable valve 30 includes a backing member 34. The backing member 34 is a breathable material. The backing member 34 and the connecting member 33 are both disposed on the first surface 31a of the metal sheet 31. The connecting member 33 surrounds the backing member 34. The backing member 34 is located in 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, so that it is not easy to deform during the working process of the battery producing gas to expand the breathable membrane and the gas releasing to shrink the breathable membrane; by making the surface of the backing member facing the breathable membrane flush with the surface of the connecting member facing the breathable membrane, when the breathable membrane and the connecting member are thermally compounded, 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 is reduced, thereby improving the structural stability and service life of the breathable valve, and thus improving the reliability of the battery and electrical equipment. In addition, by directly providing the two on the surface of the metal sheet, the secondary processing of the metal sheet is reduced, saving the operation process.

[0116] According to some embodiments of the present application, the metal sheet may not have a sink, and the air-permeable valve may not include a backing member. Fig.16 The first through hole 310 of the metal sheet 31 penetrates the metal sheet 31 along the thickness direction of the metal sheet 31. The second through hole 330 of the connector 33 penetrates 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 and covers 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] Since there is no backing member, in order to provide sufficient support for the breathable membrane, the metal sheet is usually provided with two or more through holes, and the corresponding connector is also provided with two or more through holes corresponding to the metal sheet. Through this arrangement, the metal sheet and the connector can provide greater support for the breathable membrane, so that it is not easy to deform during the working process of the battery producing gas to expand the breathable membrane and the gas release to shrink the breathable membrane, thereby improving the structural stability and service life of the breathable valve, and further improving the reliability of the battery and electrical equipment.

[0118] In one embodiment, the connecting member has a third sink, see Fig.17. The first through hole 310 of the metal sheet 31 penetrates the metal sheet 31 along the thickness direction of the metal sheet 31. The second through hole 330 of the connector 33 penetrates the connector 33 along the thickness direction of the connector 33, and the connector also has a third sink 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 sink surface 331a of the connector is fixedly connected to the third surface 32a of the breathable membrane, and the depth D3 of the third sink 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 force 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 produced during the direct compounding of the breathable membrane and the metal sheet can be reduced, the problem of deterioration of the breathable performance caused by the deformation can be improved, the structural stability and service life of the breathable valve can be improved, and the reliability of the battery and electrical equipment can be improved.

[0120] According to some embodiments of the present application, the metal sheet includes a first sink, but the air-permeable valve does not include a backing member. Figures 18 to 22 , the metal sheet 31 includes a first sinker 311, a first through hole 310 is located at the first sinker 311, a connector 33 is at least partially located at the first sinker 311, and a breathable membrane 32 is located on the surface of the connector 33 away from the first through hole 310. The first sinker 311 has a first sinker surface 311a. The first sinker surface 311a faces the first surface 31a of the metal sheet 31. The first through hole 310 passes through the first sinker surface 311a and the second surface 31b. The fifth surface 33a of the connector 33 is fixedly connected to the first sinker surface 311a of the first sinker 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 sinker, at least part of the connecting piece 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 sinker can also provide support for the connecting piece, and at the same time, the connecting piece is connected to the side of the sinker, which can enhance the interface bonding between the connecting piece and the metal sheet, thereby improving the structural stability of the air valve.

[0122] In some embodiments, see 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 occupancy of 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 bonding between the connector and the metal sheet, thereby improving the structural stability of the breathable valve.

[0123] In some embodiments, see Figures 19 to 22 , the connector 33 is entirely located in 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 arranging all the connectors in the first sink, the first sink can accommodate all the connectors, further 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 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 bonding between the connector and the metal sheet, thereby improving the structural stability of the breathable valve.

[0124] In one embodiment, see Fig.19 The first case is that the depth D1 of the first sink 311 is equal to the thickness h of the connecting member 33. In this case, the first sink can accommodate all the connecting members, further reducing the thickness of the air-permeable valve.

[0125] In one embodiment, see Fig. 20 , the second case is that the depth D1 of the first sink 311 is greater than the thickness h of the connecting member 33. Fig. 20 , the surface of the breathable membrane 32 away from the first through hole 310 protrudes from 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 protrudes from the first surface 31a of the metal sheet 31. At this time, the first sink can accommodate all the 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 the connectors and all the breathable membranes, see Fig.21 and Fig. 22 , the air-permeable membrane 32 is completely located in the first sink 311, and the depth D1 of the first sink 311 is greater than or equal to the sum of the thickness of the connecting member 33 and the air-permeable membrane 32 (h+A). Fig.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; Fig. 22 , the surface of the air permeable membrane 32 away from the first through hole 310 is located in the space of the first sinking platform 311 , that is, the fourth surface 32 b of the air permeable membrane 32 is located in the space of the first sinking platform 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 reduced, 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, wherein the modified polypropylene-based polymer material is a polypropylene-based polymer material having polar functional groups on its surface, wherein the polar functional groups include -OH, -COOH and / or -NH2. Optionally, the material of the breathable membrane and the connecting piece are the same or different.

[0130] The material of the connector can be a modified polypropylene polymer material, for example, a polypropylene polymer material modified by maleic anhydride can be used, and the modified polypropylene polymer material is a polypropylene polymer material containing polar functional groups on the surface, and the polar functional groups include -OH, -COOH and / or -NH2, etc. The surface of the metal sheet is modified by nano-treatment, and preferably, the metal sheet is an aluminum sheet. The two can form a chemical bond, which can effectively improve the interface bonding strength. In addition, the polypropylene polymer material has the characteristics of low density, good processing performance, and good chemical resistance, which can reduce the weight of the air-permeable valve, is easy to shape, and can adapt to the internal environment of the battery. At the same time, the polypropylene material has good fatigue resistance and is not easy to deform and break.

[0131] In some embodiments, the main material of the connector is the same as that of the breathable membrane. Since the main material of the connector is the same as that of the breathable membrane, the melting points or compatibilities of the two are close, and they can be combined by thermal fusion. Therefore, under the premise of meeting the air permeability, the connection between the connector and the breathable membrane is easier, and when selecting the material of the breathable membrane, the interface bonding with the metal can be ignored, so the selection range of the breathable membrane material can be broadened to meet the exhaust 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 also provided, which specifically includes:

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

[0135] A connecting member is provided, and the connecting member is arranged on the metal sheet, wherein the connecting member comprises at least one second through hole, and the first through hole is communicated with the second through hole;

[0136] A breathable membrane is provided, and the breathable membrane is arranged on the connecting piece to cover the second through hole. The heat treatment temperature of the connecting piece 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 piece is less 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, which 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 a metal plate into a stamping device and deforming the metal plate by heating or pressurizing to achieve a desired shape.

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

[0140] In some embodiments of the present application, the metal sheet and the connector are combined by thermal compounding, the breathable membrane and the connector are connected by 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, and the heat treatment temperature of the breathable membrane and the connector is less than the glass transition temperature of the breathable membrane. By providing a connector, 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 less than the glass transition temperature of the breathable membrane, the deformation generated during the direct compounding of the breathable membrane and the metal sheet can be reduced, the problem of poor air permeability caused by deformation can be further improved, the structural stability and service life of the breathable valve can be improved, and the reliability of the battery and electrical equipment can be improved.

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

[0142] According to some embodiments of the present application, the present application further provides a battery cell, the battery cell includes a housing assembly, and the vent valve or the vent valve prepared by the vent valve preparation method described in any of the above schemes is arranged on the housing assembly. Through the above arrangement, the structural stability and service life of the vent valve are improved, thereby improving the reliability of the battery.

[0143] In some embodiments, see Fig.23 , Fig.23 It 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 shell assembly includes a top cover 21 and a shell 22. The top cover 21 or the shell 22 has a vent hole 211 and a mounting sink 212 is arranged around the vent hole 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 the reliability can also be improved. Functional components such as electrode terminals 21a and explosion-proof valves 21b can be provided on the top cover 21. The electrode terminal 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 Fig.23 In the embodiment, the explosion-proof valve 21b is disposed on the top cover 21. The explosion-proof valve 21b is configured to brake and release the internal pressure of the battery cell 20 when the battery cell 20 is in thermal runaway, that is, when thermal runaway occurs inside the battery cell 20, the explosion-proof valve 21b can brake and open to release the gas generated inside the battery cell 20 due to thermal runaway. The top cover 21 is also provided with a pressure relief mechanism vent valve 30 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The top cover 21 or the shell 22 has a vent hole 211 and a mounting sink 212 is disposed around the vent hole 211. Exemplarily, in Fig.23In the embodiment, the air hole 211 and the mounting sink 212 arranged around the air hole 211 are arranged on the top cover 21. 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, that is, the welding surface of the air valve 30 and the top cover 21 or the shell 22 is located on the side facing or away from the battery cell structure 23 of the battery cell 20. The air valve 30 is arranged on the mounting sink 212. The material of the top cover 21 can also be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the top cover 21, and the insulating member can be used to isolate the electrical connection components in the shell 22 from the top cover 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[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 away from the cell structure 23, and the shielding member 21c covers the vent valve 30. Thus, the shielding member 21c can play a certain role in protecting and shielding the vent valve 30. On the one hand, it can reduce the phenomenon of wear or damage of the vent valve 30 in the external environment, and can reduce the risk of impurities or particles in the external environment entering the vent valve 30, which is conducive to improving the service life of the vent valve 30. On the other hand, covering the vent valve 30 by the shielding member 21c can improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it is convenient to connect other components such as detection elements on the side of the shielding member 21c away from the vent valve 30, so as to reduce the interference of the area where the vent valve 30 is set on the top cover 21 or the housing 22 on the connection of other components such as detection elements.

[0146] The top cover of the battery is located at one end of the battery and is laser welded to the battery shell to wrap and fix the bare cell and achieve a sealing effect. Bare cells refer to single electrochemical cells containing positive and negative electrodes, which generally cannot be used directly.

[0147] Through the above-mentioned arrangement, a new type of ventilation component, namely, a ventilation valve, is added to the battery top cover, which can slowly discharge the internal gas of the battery cell to the outside of the battery cell during its life cycle, thereby playing the role of exhausting gas and reducing pressure, and can effectively improve the long-term reliability of the battery cell; in addition, by arranging ventilation holes on 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 shell 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 shell 22 and the top cover 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the top cover 21 at the opening. Without limitation, the top cover 21 and the shell 22 can also be integrated. Specifically, the top cover 21 and the shell 22 can form a common connection surface before other components enter the shell, and when the interior of the shell 22 needs to be encapsulated, the top cover 21 covers the shell 22. The shell 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 shell 22 can be determined according to the specific shape and size of the battery cell structure 23. The material of the shell 22 can be various, 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 portions of the cathode sheets and the anode sheets with active materials constitute the main body of the cell structure, and the portions 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 disposed 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-containing phosphates of 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-containing phosphates of 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 iron manganese phosphate, a composite material of lithium iron manganese 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 examples, other optional auxiliary agents may be thickening and dispersing agents (such as sodium carboxymethyl cellulose CMC-Na), 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 commercially. 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 can 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 examples, other optional auxiliary agents may be thickening and dispersing agents (such as sodium carboxymethyl cellulose CMC-Na), 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 electrode sheets and anode electrode sheets.

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

[0166] The separator is set between the cathode and anode plates. As an insulating layer, it can effectively prevent the cathode and anode plates from contacting each other and causing internal short circuits, while allowing electrolyte ions to pass smoothly. The performance of the separator determines the interface structure and internal resistance of the battery, and directly affects the mechanical strength and reliability of the battery.

[0167] The specific type of the material of the separator is not limited, and materials known in the art that can be used for battery separators can be used, and those skilled in the art can select according to needs. As an example, the material of the separator can include one or more of polyolefins, fluoropolymers, cellulose, and glass fibers. Polyolefins can include, but are not limited to, one or more of polypropylene and polyethylene. These materials can be obtained through commercial channels.

[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 and the like. 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 material of the base membrane is not limited, and may include one or more of polyethylene, polypropylene, and glass fiber. These materials can all be obtained through commercial channels.

[0169] The electrolyte plays a role in 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 carbonate (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 (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 (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 (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 (EPC), butylene carbonate (BC), butylene carbonate (BC), butylene carbonate (BC), butylene carbonate (BC), butylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), n-propyl acetate (PA), methyl propionate (MP), ethyl propionate (EPC), butylene carbonate (BC), butylene carbonate (BC), butylene carbonate (BC), butylene carbonate (FEC), butylene carbonate (MF), butylene carbonate ( One or more of propyl propionate (EP), propyl propionate (n-PropylPropionate, PP), methyl butyrate (Methyl ButyrateMB), ethyl butyrate (Ethyl Butyrate, EB), 1,4-butyrolactone (1,4-Butyrolactone, GBL), tetramethylene sulfone (SF), dimethyl sulfone (MethylSulfone, MSM), methyl ethyl sulfone (Methyl Ethyl Sulfone, EMS) and diethyl sulfone (Diethyl Sulfone, ESE).

[0172] In some embodiments, the electrolyte further includes additives, such as an anode film-forming additive, a cathode film-forming additive, or an additive capable of improving certain battery properties, such as an additive for improving battery overcharge performance, an additive for improving battery high temperature performance, or an additive for improving battery low temperature performance.

[0173] According to some embodiments of the present application, the present application further provides a battery 100, the battery 100 includes the vent valve 30 described in any of the above solutions or the vent valve 30 prepared by the vent valve preparation method, or the battery cell 20 described in any of the above solutions. The battery 100 can be a battery pack or a battery module. Fig.24In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between 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. The battery cell 20 is contained in the housing 10. Fig.24 , Fig.24 1 is a schematic diagram of the exploded structure of a battery of an embodiment. The box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with an opening at one end, and the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side opening, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc. Among them, each battery cell 20 may be a battery, which may be 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 in other shapes.

[0175] Battery manufacturing methods include stacking and winding, that is, batteries are divided into stacking batteries and winding batteries. Stacking batteries have uniform current collection effect, small battery internal resistance, and large specific power, but they require extremely high mold precision, high equipment investment, and relatively complex processes, resulting in low production efficiency. Winding batteries are simple to make, and the production and assembly processes require general equipment precision, high production efficiency, and low cost. In terms of performance, wound batteries have excellent high and low temperature performance, very fast charging, ultra-long life, stable high output voltage, strong structure, and strong shock resistance.

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

[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 in an embodiment of the present application.

[0179] See also Fig.25 , Fig.25 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present application. The electrical device may be a vehicle 1000, a drone, an airplane, and the like. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0180] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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 system 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 vent valve, characterized in that: 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, the breathable membrane is disposed on the connecting member and covers the second through hole; 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.

2. The breathable valve according to claim 1, characterized in that: 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, characterized in that: 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 vent valve according to claim 3, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 vent valve according to claim 3, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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.

15. The breathable valve according to claim 14, characterized in that: 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.

16. The breathable valve according to claim 14, characterized in that: 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.

17. The breathable valve according to claim 16, characterized in that: 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.

18. The breathable valve according to any one of claims 1 to 17, characterized in that: The thickness of the connecting piece is 50-1000 μm.

19. A battery cell, characterized in that: include: Housing components; The breathable valve according to any one of claims 1 to 18, wherein the breathable valve is arranged on the housing assembly.

20. The battery cell according to claim 19, characterized in that 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.

21. A battery, characterized in that: It comprises the vent valve according to any one of claims 1 to 18 or the battery cell according to claim 19 or 20.

22. An electrical equipment, characterized in that: Comprising the battery of claim 21.

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