Valve assembly, battery cell, battery and electric device

Abstract

The utility model discloses a valve assembly, a battery monomer, a battery and an electric device, the valve assembly comprises: a valve body, which comprises a valve main body part and a connecting part connected with each other, and the connecting part is provided with a limiting groove; the elastic fastener comprises a sleeving part and an elastic part which are connected, the connecting part is sleeved with the sleeving part, the sleeving part is provided with a protruding part, the protruding part abuts against the circumferential side face of the connecting part, and when the sleeving part moves in the axial direction of the connecting part, the protruding part can be clamped in the limiting groove, so that the elastic part is kept elastically compressed. The valve assembly is easy to install, the number of parts is small, the number of assembling steps is reduced, the assembling efficiency is improved, the sealing reliability of the valve main body part can be improved, the valve main body part can be fixed to the shell or the box body through the elastic part in a compression mode, and the sealing reliability is improved. Therefore, the elastic part can adapt to shells or box bodies with different wall thicknesses through different compression amounts, and the applicability is high.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and service life. The battery cells in the battery will generate a lot of heat during the continuous charging and discharging process, causing changes in the internal pressure of the battery or battery cells. Therefore, the battery cells or batteries will be equipped with valve components to achieve internal and external pressure balance and improve the reliability of the battery cells or batteries. However, at present, most of the valve components are threaded fastening methods, with low assembly efficiency and poor connection reliability, which will affect the reliability of the battery cells or batteries. Utility Model Content

[0003] The embodiments of the present application provide a valve assembly, a battery cell, a battery and an electrical device, which can effectively improve the assembly efficiency and connection reliability of the valve assembly, and are beneficial to improving the reliability of the battery cell or the battery.

[0004] In the first aspect, an embodiment of the present application provides a valve assembly, which is applied to a battery cell or a battery, comprising: a valve body, comprising a connected valve body portion and a connecting portion, the connecting portion being provided with a limiting groove; an elastic fastener, comprising a connected sleeve portion and an elastic portion, the sleeve portion being sleeved on the connecting portion, the sleeve portion being provided with a protrusion, the protrusion being stopped on the peripheral side surface of the connecting portion, the sleeve portion being configured so that the protrusion can be stuck in the limiting groove when moving along the axial direction of the connecting portion, so that the elastic portion remains elastically compressed.

[0005] In the above technical solution, when the valve assembly is assembled, the sleeve portion can be sleeved on the connecting portion and move along the axial direction of the connecting portion, so that the protrusion is stuck in the limit groove, so that the elastic portion can be compressed to tightly stop the valve body against the shell of the battery cell or the box of the battery, thereby playing the role of fixing the valve body. In this way, the installation of the valve assembly is relatively simple, with fewer parts, which is conducive to cost saving, and can reduce assembly steps and improve assembly efficiency. In addition, the elastic effect of the elastic fastener is conducive to improving the sealing reliability of the valve body and the reliability of the battery cell or battery. The elastic portion can fix the valve body to the shell or box by compression, so the elastic portion can adapt to shells or boxes with different wall thicknesses through different compression amounts, and has strong applicability.

[0006] In some embodiments of the present application, the elastic part includes an elastic part body and an elastic hook connected to each other, the elastic part body is connected to the sleeve part, and the elastic hook is bent relative to the elastic part body toward a side close to the connection part.

[0007] In the above technical solution, the elastic part is configured to include an elastic part body and an elastic hook, and the elastic hook is bent relative to the elastic part body toward the side close to the connection part, so that the elastic part is more easily deformed by pressure, and can be compressed quickly to generate elastic force to clamp the valve body. Since the elastic hook is bent relative to the elastic part body toward the side close to the connection part, the elastic hook is closer to the central area of ​​the valve body, and when the elastic hook is compressed and deformed, it can press the area of ​​the valve body close to the through hole, thereby improving the sealing of the valve body on the battery cell or battery, and further improving the reliability of the battery cell or battery.

[0008] In some embodiments of the present application, the elastic portion body is inclined relative to the sleeve portion and is disposed toward a side away from the connecting portion.

[0009] In the above technical solution, by tilting the main body of the elastic part relative to the sleeve part toward the side away from the connecting part, the elastic part has a greater probability of bending toward the side away from the connecting part when it is compressed and elastically deformed, that is, the bending trend of the elastic part is more obvious, and the elastic deformation produced is more stable, which can better clamp the valve main body. At the same time, it is also beneficial for the elastic part to produce a larger elastic deformation, bring a greater elastic force, and improve the clamping reliability and sealing of the valve main body.

[0010] In some embodiments of the present application, the elastic hook has a thickness direction and a length direction pointing to the connecting portion, both the thickness direction and the length direction intersect with the axial direction of the connecting portion, and the thickness of the elastic hook gradually decreases along the length direction.

[0011] In the above technical solution, since the thickness of the elastic hook gradually decreases along the length direction, when the elastic hook is under pressure, the elastic hook is likely to be the first to undergo elastic deformation. It can be seen that the elastic hook and the elastic part body have different elastic moduli, so that the elastic part can show better adaptability under different force loading. The elastic hook and the elastic part body can face different extrusion forces and provide different rebound forces to better clamp the valve body. Secondly, the elastic part usually deforms within a certain range. When the stress of the elastic part reaches the limit of its material strength, plastic deformation or fracture will occur. Since the elastic hook and the elastic part body have different elastic moduli, a more balanced stress distribution can be achieved at the stress point, reducing the possibility of stress concentration, which is conducive to improving the life and reliability of the elastic part.

[0012] In some embodiments of the present application, a circular arc transition angle is provided between the elastic part body and the elastic hook. In this technical solution, the circular arc transition angle can disperse the stress around the connection between the elastic part body and the elastic hook, reduce the probability of stress concentration between the elastic part body and the elastic hook, reduce the risk of fatigue damage or crack propagation, and help to improve the service life and reliability of the elastic part. Secondly, the circular arc transition angle can also make the appearance of the elastic part smooth and beautiful, which can improve the appearance.

[0013] In some embodiments of the present application, the elastic part includes at least two, and the at least two elastic parts are arranged at intervals along the circumference of the sleeve part. In this technical solution, by arranging the elastic part in multiple circumferences of the sleeve part, the multiple elastic parts can enhance the clamping effect on the valve body, and can also provide a balanced clamping force to multiple circumferential positions of the valve body, which is conducive to improving the clamping reliability and sealing of the elastic fastener on the valve body.

[0014] In some embodiments of the present application, the limit groove extends along the circumferential direction of the connecting part, the connecting part is provided with a guide groove, the guide groove extends along the axial direction of the connecting part and is connected to the limit groove, the guide groove is located on the side of the limit groove away from the valve body, and the protrusion can be slidably arranged in the guide groove.

[0015] In the above technical solution, a guide groove connected to the limit groove is provided on the connecting part, so that the guide groove can provide guidance for the movement of the sleeve part, and can enable the sleeve part to slide along the axial direction of the connecting part and then rotate a certain angle, so that the elastic fastener can fasten the valve body to the battery cell or the battery. With this solution, the installation of the valve assembly is relatively simple, which can improve the assembly efficiency and reduce the cost.

[0016] In some embodiments of the present application, the guide grooves include at least two, and at least two guide grooves are arranged at intervals along the circumference of the connecting portion. In this technical solution, by arranging the guide grooves in multiple numbers along the circumference of the connecting portion, the multiple guide grooves can enhance the guiding effect on the sleeve connecting portion, and can also provide a balanced guiding effect on multiple circumferential positions of the sleeve connecting portion, which is conducive to improving the movement reliability of the sleeve connecting portion on the connecting portion.

[0017] In some embodiments of the present application, the groove surface of the limiting groove away from the valve body is a rough surface. In this technical solution, by setting the groove surface of the limiting groove away from the valve body as a rough surface, the limiting groove and the protruding portion have a greater friction when they are in contact, which can reduce the probability of the protruding portion moving along the limiting groove to the guide groove due to vibration and other reasons after a long time, causing the sleeve and the connecting portion to loosen, and can improve the connection reliability between the elastic fastener and the valve body.

[0018] In the second aspect, the embodiment of the present application also provides a battery cell, including the valve assembly as described above. In this technical solution, by adopting the valve assembly, the connection between the valve assembly and the housing of the battery cell is relatively simple and convenient, which can improve the assembly efficiency and connection reliability of the valve assembly on the housing, thereby helping to improve the reliability of the battery cell.

[0019] In a third aspect, the embodiment of the present application further provides a battery, including the valve assembly as described above, or including the battery cell as described above. In this technical solution, by adopting the valve assembly, the connection between the valve assembly and the battery box is relatively simple and convenient, which can improve the assembly efficiency and connection reliability of the valve assembly on the box, and is conducive to improving the reliability of the battery.

[0020] In a fourth aspect, the present application also provides an electric device, including a battery cell as described above, or a battery as described above. In this technical solution, by using the battery cell or battery, the reliability of the battery cell or battery is relatively strong, which is conducive to improving the reliability of the electric device, and extending the service life and working stability of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0023] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0024] Figure 3 A schematic diagram of a three-dimensional structure of a valve assembly provided in some embodiments of the present application;

[0025] Figure 4 A front view of a valve assembly provided in some embodiments of the present application;

[0026] Figure 5 A side view of a valve assembly provided for some embodiments of the present application;

[0027] Figure 6 A schematic diagram of the internal structure of a valve assembly provided in some embodiments of the present application;

[0028] Figure 7 Schematic diagram of the valve assembly provided in some embodiments of the present application cooperating with the box wall of the box body Figure 1 ;

[0029] Figure 8 Schematic diagram of the valve assembly provided in some embodiments of the present application cooperating with the box wall of the box body Figure 2 ;

[0030] Fig. 9 A schematic diagram of the three-dimensional structure of a battery provided in some embodiments of the present application.

[0031] Icons: 1000, vehicle; 100, battery; 10, box body; 11, first box body; 12, second box body; 101, box wall; 20, battery cell; 30, valve assembly; 31, valve body; 311, valve main body; 311a, groove; 312, connecting part; 312a, limiting groove; 312b, guide groove; 313, sealing member; 32, elastic fastener; 321, sleeve part; 3211, raised part; 322, elastic part; 3221, elastic part main body; 3222, elastic hook; 322a, arc transition angle; 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0034] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0038] The term "plurality" used in the present application refers to two or more (including two).

[0039] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0040] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0041] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0042] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0043] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0044] The inventors discovered that the battery cells in the battery will generate a lot of heat during the continuous charging and discharging process, causing changes in the internal pressure of the battery or battery cells. Therefore, valve components are set on the battery cells or batteries to achieve internal and external pressure balance and improve the reliability of the battery cells or batteries. However, most of the valve components are currently threaded fastening methods. There is a high probability of threaded locking and twisting when using this threaded fastening method, which will affect the air tightness. In addition, threaded fastening requires special tools and operators, and the installation efficiency is relatively low. It also requires matching threaded sleeves, which is relatively costly. Secondly, when tightening valve components, if the torque error occurs, it is easy to cause the valve components to break, increase the reliability risk, and affect the reliability of the battery cells or batteries.

[0045] Based on the above considerations, in order to solve the problems of low assembly efficiency and poor connection reliability when valve components are installed on battery cells or batteries, the inventors designed a valve assembly, including a valve body and an elastic fastener, the valve body including a connected valve main body portion and a connecting portion, the connecting portion being provided with a limiting groove; the elastic fastener including a connected sleeve portion and an elastic portion, the sleeve portion being sleeved on the connecting portion, the sleeve portion being provided with a protrusion, the protrusion being stopped at the peripheral side surface of the connecting portion, and the sleeve portion being configured so that the protrusion can be stuck in the limiting groove when moving along the axial direction of the connecting portion, so that the elastic portion remains elastically compressed.

[0046] In a valve assembly of this structure, the valve assembly can be used to be installed on the shell of a battery cell or a box of a battery. The valve body can be located on the outside of the shell or the box, the connecting part is inserted into the through hole of the shell or the box, the elastic fastener is located on the inside of the shell or the box, and the sleeve part of the elastic fastener is sleeved on the connecting part, and a force directed to the valve body is applied to the sleeve part. The elastic fastener can move along the axial direction of the connecting part and gradually approach the inner wall of the shell or the box. When the elastic part contacts the inner wall of the shell or the box, the elastic part is compressed as the sleeve part continues to move. When the protrusion reaches the limiting groove, the protrusion can be stuck in the limiting groove. At this time, the limiting groove can limit the displacement of the sleeve part along the axial direction of the connecting part, so that the elastic force of the elastic part tightly stops the valve body against the shell or the box, which can improve the sealing between the valve body and the shell or the box, and at the same time, the valve assembly has a higher connection reliability on the shell or the box. The use of this valve assembly can improve assembly efficiency and have a higher connection reliability, which is conducive to improving the reliability of the battery cell or the battery.

[0047] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the valve assembly disclosed in the present application, battery cells, etc., can be used to form the electrical device, which is beneficial to improve the application scope of the valve assembly and reduce the difficulty of assembling the valve assembly.

[0048] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0049] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0050] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. 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, etc. 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 driving the vehicle 1000.

[0051] 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.

[0052] Please refer to Figure 2 , Figure 2 The structural exploded diagram of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0053] In the battery 100, multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid 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 multiple battery cells 20.

[0054] Please refer to Figure 2 , Figure 2 A partial structural diagram of a battery 100 provided in some embodiments of the present application. The battery 100 includes multiple rows of battery cells 20, which are arranged along the length direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the width direction of the box 10; or, multiple rows of battery cells 20 are arranged along the width direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the length direction of the box 10.

[0055] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. Figure 2 In the embodiment, the battery cell 20 is in the shape of a cylinder.

[0056] According to some embodiments of the present application, referring to Figures 3 to 5 An embodiment of the present application provides a valve assembly 30 . The valve assembly 30 is applied to a battery cell 20 or a battery 100 . The valve assembly 30 includes a valve body 31 and an elastic fastener 32 .

[0057] The valve body 31 includes a valve body part 311 and a connecting part 312 connected to each other, and the connecting part 312 is provided with a limiting groove 312a. The elastic fastener 32 includes a sleeve part 321 and an elastic part 322 connected to each other, and the sleeve part 321 is sleeved on the connecting part 312, and the sleeve part 321 is provided with a protrusion 3211, and the protrusion 3211 stops at the peripheral side of the connecting part 312, and the sleeve part 321 is configured so that when the connecting part 312 moves along the axial direction, the protrusion 3211 can be stuck in the limiting groove 312a, so that the elastic part 322 remains elastically compressed.

[0058] The valve body 31 may refer to a main body component that acts as a valve to achieve the opening, closing and regulation of gas or fluid. The valve body 31 may be, but is not limited to, the main body structure of an explosion-proof valve, a breathable valve, and a balancing valve, etc. Its construction and operation are known to those skilled in the art and will not be repeated here. The valve body 311 may refer to the main component of the valve body 31, which plays a role in regulating the internal pressure of the shell of the battery cell 20 or the box 10 of the battery 100. The connecting portion 312 may refer to a portion of the valve body 311 used to connect the shell of the battery cell 20 or the box 10 of the battery 100. For example, the shell or the box 10 may be provided with a through hole, and the connecting portion 312 may be penetrated through the through hole.

[0059] refer to Figure 3 and Figure 4 The connecting portion 312 may be, but is not limited to, cylindrical or prismatic. The axial direction of the connecting portion 312 may be Figure 3 and Figure 4 The first direction X in .

[0060] The sleeve portion 321 may refer to a tubular component, which may be sleeved on the connection portion 312 and may move along the axial direction of the connection portion 312. The sleeve portion 321 may be, but is not limited to, a circular sleeve and a rectangular sleeve, etc. The elastic portion 322 may refer to an elastic component that may be elastically deformed when subjected to pressure.

[0061] refer to Figure 7 , Figure 8 and Fig. 9 Taking the application of the valve assembly 30 to the battery 100 as an example, the box wall 101 of the box body 10 of the battery 100 is provided with a through hole, the valve body 31 is located on the outside of the box body 10, and the connecting portion 312 is passed through the through hole and is partially located on the inside of the box body 10. The elastic fastener 32 is arranged on the inside of the box body 10, and the sleeve portion 321 is sleeved on the connecting portion 312. The user can apply a force on the sleeve portion 321 to drive the sleeve portion 321 to move toward the valve body 31 along the axial direction of the connecting portion 312. When the sleeve portion 321 moves, the elastic portion 322 can contact the box wall 101 of the box body 10. As the sleeve portion 321 continues to be pushed, when the protrusion 3211 reaches the limiting groove 312a, the protrusion 3211 can be stuck in the limiting groove 312a. At this time, under the limiting action of the protrusion 3211 and the limiting groove 312a, the sleeve portion 321 can remain fixed relative to the connecting portion 312, and the elastic force accumulated in the elastic portion 322 can act on the box wall 101, driving the connecting portion 312 to move away from the valve body portion 311, so that the valve body portion 311 is tightly stopped on the box wall 101, fixing the valve body 31 on the box body 10, and ensuring good sealing between the valve body portion 311 and the box wall 101, and also ensuring high connection reliability between the valve assembly 30 and the box wall 101.

[0062] In the above technical solution, when the valve assembly 30 is assembled, the sleeve portion 321 can be sleeved on the connecting portion 312 and move along the axial direction of the connecting portion 312, so that the protrusion 3211 is stuck in the limiting groove 312a, so that the elastic portion 322 can be compressed to tightly stop the valve body 311 on the shell of the battery cell 20 or the box 10 of the battery 100, thereby playing the role of fixing the valve body 31. In this way, the installation of the valve assembly 30 is relatively simple, with relatively few parts, which is conducive to saving costs, and can reduce assembly steps and improve assembly efficiency. In addition, through the elastic effect of the elastic fastener 32, it is conducive to improving the sealing reliability of the valve body 311 and improving the reliability of the battery cell 20 or the battery 100. The elastic portion 322 can fix the valve body 311 on the shell or box 10 by compression, so the elastic portion 322 can adapt to the shell or box 10 with different wall thicknesses through different compression amounts, and has strong applicability.

[0063] In some embodiments of the present application, reference Figure 4 The elastic portion 322 includes an elastic portion body 3221 and an elastic hook 3222 connected to each other. The elastic portion body 3221 is connected to the sleeve portion 321 , and the elastic hook 3222 is bent relative to the elastic portion body 3221 toward a side close to the connecting portion 312 .

[0064] The elastic part body 3221 and the elastic hook 3222 may be elastic parts, and may be, but not limited to, plastic parts and iron parts. The elastic hook 3222 may be a hook-shaped part that is bent relative to the elastic part body 3221. The elastic part body 3221 and the elastic hook 3222 may be, but not limited to, rectangular strips and cylindrical shapes.

[0065] Since the elastic hook 3222 is bent toward the side close to the connecting portion 312 relative to the elastic portion main body 3221, the elastic portion 322 is constructed to have a tendency to bend in a fixed direction (the direction close to the connecting portion 312), so that the elastic portion 322 can undergo stable and predictable deformation, so that the elastic portion 322 can generate a stable and reliable elastic force, and the elastic hook 3222 can bend when subjected to a smaller force, thereby generating elastic deformation, which is beneficial to improving the reliability of the valve main body 311 being clamped on the shell or box body 10.

[0066] Secondly, since the elastic hook 3222 is bent toward the side close to the connecting portion 312 relative to the elastic portion main body 3221, the elastic hook 3222 can clamp the central area of ​​the valve main body 311 when it is elastically deformed, and multiple elastic portions 322 can be arranged along the circumference of the sleeve portion 321 (around the first direction X). Therefore, the area required to be clamped by the multiple elastic portions 322 is relatively small, which makes it easier to achieve a high sealing performance between the valve main body 311 and the shell or box 10, and reduce the entry of liquids and dust in the external environment into the through holes on the shell or box 10. In addition, the area required to be clamped by the multiple elastic portions 322 is relatively small, so the number of elastic portions 322 can be set relatively small, which can reduce the number of components and reduce the manufacturing difficulty and cost.

[0067] In the above technical solution, the elastic part 322 is configured to include an elastic part body 3221 and an elastic hook 3222, and the elastic hook 3222 is bent relative to the elastic part body 3221 toward the side close to the connecting part 312, so that the elastic part 322 is more easily deformed under pressure, and can deform quickly and generate elastic force to clamp the valve body 311. Since the elastic hook 3222 is bent relative to the elastic part body 3221 toward the side close to the connecting part 312, the elastic hook 3222 is closer to the central area of ​​the valve body 311, and when the elastic hook 3222 is compressed and deformed, it can press the area of ​​the valve body 311 close to the through hole, thereby improving the sealing of the valve body 311 on the battery cell 20 or the battery 100, and further improving the reliability of the battery cell 20 or the battery 100.

[0068] In some embodiments of the present application, reference Figure 6 The elastic portion body 3221 is inclined relative to the sleeve portion 321 and is disposed toward a side away from the connecting portion 312 .

[0069] It can be understood that the above scheme makes the elastic part 322 present a "V-shaped" structure with its opening facing the connecting part 312. When the elastic hook 3222 is pressurized, the elastic part 322 can bend as a whole towards the connecting part 312. On the one hand, this can provide the elastic part 322 with a larger space and allow it to bend to a greater extent, thereby bringing about a greater elastic force and improving the clamping reliability of the valve body 311. On the other hand, when the elastic body 3221 is compressed and bent towards the side away from the connecting part 312, a force along the radial direction of the connecting part 312 can be applied to the elastic hook 3222, so that the elastic hook 3222 tends to approach the central area of ​​the valve body 311, thereby improving the sealing between the valve body 311 and the shell or box 10.

[0070] In the above technical solution, by tilting the elastic part main body 3221 relative to the sleeve part 321 toward the side away from the connecting part 312, the elastic part 322 has a greater probability of bending toward the side away from the connecting part 312 when it is compressed and elastically deformed, that is, the bending trend of the elastic part 322 is more obvious, and the elastic deformation produced is more stable, which can better clamp the valve main body 311. At the same time, it is also beneficial for the elastic part 322 to produce a larger elastic deformation, bringing a larger elastic force, which can improve the clamping reliability and sealing of the valve main body 311.

[0071] In some embodiments of the present application, the elastic hook 3222 has a thickness direction and a length direction pointing to the connecting portion 312, both of which intersect with the axial direction of the connecting portion 312, and the thickness of the elastic hook 3222 gradually decreases along the length direction. Figure 6 The thickness direction of the elastic hook 3222 may refer to Figure 6 The length direction may refer to direction a, and the length direction may refer to direction b.

[0072] In this technical solution, since the thickness of the elastic hook 3222 gradually decreases along the length direction, when the elastic hook 3222 is under pressure (contacting the inner wall of the shell or box body 10), the elastic hook 3222 is likely to produce elastic deformation first. It can be seen that the elastic hook 3222 and the elastic part main body 3221 have different elastic moduli, so that the elastic part 322 can show better adaptability under different force loadings. The elastic hook 3222 and the elastic part main body 3221 can face different extrusion forces and provide different rebound forces to better clamp the valve body 311.

[0073] Secondly, the elastic part 322 usually deforms within a certain range. When the stress of the elastic part 322 reaches the limit of its material strength, plastic deformation or fracture will occur. Since the elastic hook 3222 and the elastic part body 3221 have different elastic moduli, a more balanced stress distribution can be achieved at the stress-bearing point, reducing the possibility of stress concentration, which is beneficial to improving the life and reliability of the elastic part 322.

[0074] In some embodiments of the present application, reference Figure 4 A circular arc transition angle 322a is provided between the elastic part body 3221 and the elastic hook 3222 .

[0075] In the above technical solution, the arc transition angle 322a can disperse the stress around the connection between the elastic part body 3221 and the elastic hook 3222, reduce the probability of stress concentration between the elastic part body 3221 and the elastic hook 3222, reduce the risk of fatigue damage or crack propagation, and help to improve the service life and reliability of the elastic part 322. Secondly, the arc transition angle 322a can also make the shape of the elastic part 322 smooth and beautiful, which can improve the appearance.

[0076] In some embodiments of the present application, reference Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 The elastic portion 322 includes at least two elastic portions 322 , and the at least two elastic portions 322 are arranged at intervals along the circumference of the sleeve portion 321 .

[0077] The elastic parts 322 may include but are not limited to two, three, four, five, etc. For example, refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 The number of elastic portions 322 may be six along the circumferential direction of the sleeve portion 321 , that is, the elastic portions 322 are provided on both sides of the second direction Y and both sides of the third direction Z of the sleeve portion 321 .

[0078] In the above technical solution, by arranging the elastic portion 322 into multiple ones along the circumference of the sleeve portion 321, the multiple elastic portions 322 can enhance the clamping effect on the valve body portion 311, and also provide a balanced clamping force to multiple circumferential positions of the valve body portion 311, which is beneficial to improving the clamping reliability and sealing of the elastic fastener 32 on the valve body portion 311.

[0079] In some embodiments of the present application, reference Figure 3 , Figure 4 , Figure 6 and Figure 7 The limiting groove 312a extends along the circumferential direction of the connecting portion 312, and the connecting portion 312 is provided with a guide groove 312b, which extends along the axial direction of the connecting portion 312 and is connected to the limiting groove 312a. The guide groove 312b is located on the side of the limiting groove 312a away from the valve body portion 311, and the protrusion 3211 is slidably arranged in the guide groove 312b.

[0080] In the above solution, the circumferential direction of the connecting portion 312 may refer to a circumferential direction arranged around the first direction X, and the limiting groove 312a may be an annular groove or an arc groove, etc.

[0081] The guide groove 312 b can provide a guiding function for the sleeve portion 321 to move axially along the connecting portion 312 , thereby improving the movement reliability of the sleeve portion 321 . Secondly, if the guide groove 312b is not provided, the protrusion 3211 needs to be tightly stopped on the peripheral side surface of the connecting portion 312, and the protrusion 3211 is stuck in the limiting groove 312a when it reaches the limiting groove 312a. By providing the guide groove 312b, the protrusion 3211 can be fitted in the guide groove 312b when the sleeve 321 is sleeved on the connecting portion 312. When the sleeve 321 is pressurized, the protrusion 3211 slides along the guide groove 312b. When the protrusion 3211 reaches the limiting groove 312a, it only needs to rotate the sleeve 321 a certain angle to make the protrusion 3211 stuck in the limiting groove 312a, thereby limiting the axial movement of the sleeve 321 relative to the connecting portion 312, so that the elastic fastener 32 can clamp the valve body 31 on the shell or box body 10.

[0082] That is to say, in the above technical solution, by providing a guide groove 312b connected to the limit groove 312a on the connecting portion 312, the guide groove 312b can provide guidance for the movement of the sleeve portion 321, and can enable the sleeve portion 321 to slide along the axial direction of the connecting portion 312 and then rotate a certain angle, so that the elastic fastener 32 can fasten the valve body 31 to the battery cell 20 or the battery 100. With this solution, the installation of the valve assembly 30 is relatively simple, which can improve assembly efficiency and reduce costs.

[0083] In some embodiments of the present application, reference Figure 3 , Figure 4 , Figure 6 and Figure 7 The guide grooves 312 b include at least two guide grooves 312 b , and at least two guide grooves 312 b are arranged at intervals along the circumference of the connecting portion 312 .

[0084] The guide slots 312b may include but are not limited to two, three, four, five, etc. For example, refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 The guide grooves 312 b can be set to six along the circumference of the connecting portion 312 , that is, the connecting portion 312 is provided with guide grooves 312 b on both sides of the second direction Y and both sides of the third direction Z.

[0085] In the above technical solution, by arranging the guide grooves 312b into multiple ones along the circumference of the connecting portion 312, the multiple guide grooves 312b can enhance the guiding effect on the sleeve portion 321, and can also provide balanced guiding effect on multiple circumferential positions of the sleeve portion 321, which is beneficial to improving the movement reliability of the sleeve portion 321 on the connecting portion 312.

[0086] In some embodiments of the present application, the groove surface of the limiting groove 312a away from the valve body 311 is a rough surface. In this technical solution, by setting the groove surface of the limiting groove 312a away from the valve body 311 as a rough surface, the limiting groove 312a and the protrusion 3211 can have a large friction when they are in contact, which can reduce the probability of the protrusion 3211 moving along the limiting groove 312a to the guide groove 312b due to vibration and other reasons after a long time, so that the sleeve part 321 and the connecting part 312 are loosened, and the connection reliability between the elastic fastener 32 and the valve body 31 can be improved.

[0087] In some embodiments of the present application, reference Figure 6 A groove 311a is provided on the surface of the valve body 311 near the connection part 312, and a sealing member 313 is provided in the groove 311a. The groove 311a can provide the required installation position of the sealing member 313, thereby improving the connection reliability between the sealing member 313 and the valve body 311. The sealing member 313 can improve the sealing reliability between the valve body 311 and the box wall 101.

[0088] The valve assembly 30 provided according to the embodiment of the present application includes a valve body 31 and an elastic fastener 32 .

[0089] The valve body 31 includes a valve main body portion 311 and a connecting portion 312 connected to each other. The connecting portion 312 is provided with a limiting groove 312a and a guide groove 312b. The limiting groove 312a is an annular groove extending in the circumferential direction of the connecting portion 312. The guide groove 312b extends along the axial direction of the connecting portion 312 and communicates with the limiting groove 312a. The guide groove 312b is located on a side of the limiting groove 312a away from the valve main body portion 311.

[0090] The elastic fastener 32 includes a sleeve portion 321 and an elastic portion 322 connected to each other. The sleeve portion 321 is sleeved on the connecting portion 312. The sleeve portion 321 is provided with a protrusion 3211. The protrusion 3211 is slidably disposed in the guide groove 312b.

[0091] When the valve assembly 30 is in use, a force is applied to the elastic fastener 32, and the sleeve portion 321 is pushed along the guide groove 312b to the position of the limit groove 312a, and then a rotational force is applied to make the protrusion 3211 on the sleeve portion 321 stuck in the limit groove 312a to prevent withdrawal, so that it can be quickly fixed.

[0092] In a second aspect, the embodiment of the present application further provides a battery cell 20, including a valve assembly 30. In the above technical solution, by adopting the valve assembly 30, the connection between the valve assembly 30 and the housing of the battery cell 20 is relatively simple and convenient, which can improve the assembly efficiency and connection reliability of the valve assembly 30 on the housing, and is conducive to improving the reliability of the battery cell 20.

[0093] In a third aspect, the embodiment of the present application further provides a battery 100, including a valve assembly 30, or including a battery cell 20. In the above technical solution, by adopting the valve assembly 30, the connection between the valve assembly 30 and the box body 10 of the battery 100 is relatively simple and convenient, which can improve the assembly efficiency and connection reliability of the valve assembly 30 on the box body 10, and is conducive to improving the reliability of the battery 100.

[0094] In a fourth aspect, the embodiment of the present application further provides an electric device, including a battery cell 20 or a battery 100. In the above technical solution, by adopting the battery cell 20 or the battery 100, the reliability of the battery cell 20 or the battery 100 is relatively strong, which is conducive to improving the reliability of the electric device and extending the service life and working stability of the electric device.

[0095] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The above are only preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A valve assembly, characterized in that: The valve assembly is applied to a battery cell or a battery, and comprises: The valve body comprises a valve main body part and a connecting part connected to each other, wherein the connecting part is provided with a limiting groove; An elastic fastener comprises a connected sleeve portion and an elastic portion, wherein the sleeve portion is sleeved on the connecting portion, the sleeve portion is provided with a protrusion, and the protrusion stops at the peripheral side surface of the connecting portion. The sleeve portion is configured so that when the protrusion moves along the axial direction of the connecting portion, the protrusion can be stuck in the limiting groove, so that the elastic portion remains elastically compressed.

2. The valve assembly according to claim 1, characterized in that The elastic part comprises an elastic part body and an elastic hook connected to each other. The elastic part body is connected to the sleeve part, and the elastic hook is bent relative to the elastic part body toward a side close to the connection part.

3. The valve assembly according to claim 2, characterized in that The elastic portion body is arranged obliquely relative to the sleeve portion toward a side away from the connecting portion.

4. The valve assembly according to claim 2 or 3, characterized in that: The elastic hook has a thickness direction and a length direction pointing to the connecting portion, the thickness direction and the length direction both intersect with the axial direction of the connecting portion, and the thickness of the elastic hook gradually decreases along the length direction.

5. The valve assembly according to claim 2 or 3, characterized in that: An arc transition angle is provided between the elastic part body and the elastic hook.

6. The valve assembly according to any one of claims 1 to 3, characterized in that: The elastic parts include at least two, and the at least two elastic parts are arranged at intervals along the circumference of the sleeve part.

7. The valve assembly according to claim 1, characterized in that The limiting groove extends along the circumferential direction of the connecting part, and the connecting part is provided with a guide groove, which extends along the axial direction of the connecting part and is connected to the limiting groove. The guide groove is located on the side of the limiting groove away from the valve body, and the protrusion is slidably arranged in the guide groove.

8. The valve assembly according to claim 7, characterized in that The guide grooves include at least two, and at least two of the guide grooves are arranged at intervals along the circumference of the connecting portion.

9. The valve assembly according to claim 7 or 8, characterized in that: The groove surface of the limiting groove away from the valve main body is a rough surface.

10. A battery cell, characterized in that: Comprising a valve assembly as claimed in any one of claims 1 to 9.

11. A battery, characterized in that: The invention comprises the valve assembly according to any one of claims 1 to 9, or comprises the battery cell according to claim 10.

12. An electrical device, characterized in that: Comprising the battery cell as claimed in claim 10, or the battery as claimed in claim 11.

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