Battery cells, seals, battery devices and electrical devices

Abstract

The present application is applicable to the field of battery technology, and proposes a battery cell, a seal, a battery device and an electrical device, the battery cell comprising: a shell and an electrode assembly; the shell has a first wall, and a first through-hole structure is provided on the first wall; a seal is arranged in the first through-hole structure, and a first groove is recessed in the radial direction of the seal on the peripheral side surface of the seal; a connecting structure, one side of the connecting structure is connected to the inner wall of the first through-hole structure, and the other side of the connecting structure is connected to the inner wall surface of the first groove and the peripheral side surface of the seal, and the connecting structure separates the first groove along the radial direction of the seal; in the battery cell provided in the embodiment of the present application, a first groove is provided on the peripheral side of the seal, and in the process of the seal being connected to the end cover through the connecting structure, the gas generated during the processing can be discharged to the outside of the shell through the first groove to reduce the air pressure difference between the inside and outside of the shell, thereby reducing the air pressure that the connecting structure may be subjected to, and reducing the risk of damage and deformation of the connecting structure.

Description

Technical Field

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

[0002] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0003] In current battery devices, the liquid injection hole of the battery cell is usually sealed by a sealant welded on the end cover. During the welding process of the sealant, the air pressure on the side of the sealant facing the battery cell is likely to increase, causing the sealant to easily have explosion points during the welding process, which can easily lead to poor sealing. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a seal, a battery device and an electrical device, which can reduce the risk of explosion points and welding liquid splashing during the welding process of the seal.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0006] A shell, wherein a housing cavity is provided in the shell, the shell has a first wall, and a first through-hole structure is provided on the first wall; an electrode assembly is accommodated in the housing cavity; a sealing member is arranged in the first through-hole structure, and a first groove is recessed along the radial direction of the seal on the circumferential side surface of the seal, and the first groove penetrates the seal along the axial direction of the seal; a connecting structure, wherein one side of the connecting structure is connected to the inner wall of the first through-hole structure, and the other side of the connecting structure is connected to the inner wall surface of the first groove and the circumferential side surface of the seal, and the connecting structure separates the first groove along the radial direction of the seal.

[0007] In the technical solution of this embodiment, a first groove is provided on the peripheral side of the seal. When the seal is connected to the first wall through the connecting structure, the gas generated by the processing can be discharged to the outside of the outer shell through the first groove to reduce the air pressure difference between the inside and outside of the outer shell, thereby reducing the air pressure that the connecting structure may be subjected to, and reducing the risk of damage and deformation of the connecting structure; in the case where the connecting structure is a weld mark formed by welding, this setting can also reduce the risk of explosion points and spattering due to the air pressure difference during welding.

[0008] In some embodiments, a ratio of an opening area of ​​the first groove to an area of ​​a peripheral side surface of the seal is greater than or equal to 0.5.

[0009] The technical solution of this embodiment provides some ratios of the opening area of ​​the first groove to the area of ​​the surrounding side surface, so that the first groove can better discharge the gas in the shell to the outside of the shell, so as to better reduce the air pressure difference inside and outside the shell, thereby better reducing the risk of damage and deformation of the connection structure.

[0010] In some embodiments, the number of the first slots is at least two.

[0011] In the technical solution of this embodiment, the number of first grooves is set to two, so that the gas in the shell can be discharged from different first grooves at different positions; in the process of connecting the seal to the first wall through the connecting structure, the connecting structure separates the first grooves one by one, so that the gas in the shell can be better discharged to the outside of the shell in the process, so as to better reduce the air pressure difference inside and outside the shell.

[0012] In some embodiments, in the radial direction of the seal, a size of the first groove ranges from 0.1 mm to 0.2 mm.

[0013] The technical solution of this embodiment provides a range of sizes of some first grooves in the radial direction of the seal, so that the radial size of a single first groove is smaller, thereby reducing the difficulty of the connecting structure to separate the single first groove, so that the connecting structure can better separate the first groove and improve the sealing performance of the seal to the first through hole structure.

[0014] In some embodiments, a support plate connected to the inner wall of the first through hole structure is provided in the first through hole structure, a through second through hole structure is provided on the support plate, and the first groove is connected to the second through hole structure; a sealing member is provided on the side of the support plate away from the accommodating cavity.

[0015] In the technical solution of this embodiment, a support plate is arranged in the first through hole structure to support the seal through the support plate and limit the displacement of the seal, thereby facilitating the installation and fixation of the seal.

[0016] In some embodiments, a second groove is provided on a side of the sealing member facing the support plate, one end of the second groove is connected to the first groove, and the other end of the second groove is connected to the second through hole structure.

[0017] In the technical solution of this embodiment, a second groove is arranged on the seal so that the gas in the shell can enter the first groove through the second groove and can be discharged to the outside of the shell through the first groove; the setting of the second groove can reduce the interference of the support plate on the discharge of the gas in the shell to the outside of the shell.

[0018] In some embodiments, the second groove extends in the radial direction of the sealing member, and an end of the second groove facing away from the first groove extends to a side of the second through hole structure facing away from the accommodating cavity.

[0019] The technical solution of this embodiment provides some specific structures of the second groove, so that the second groove can be connected with the second through hole structure and the first groove, so that the gas in the shell can be discharged to the outside through the second through hole structure, the second groove and the first groove.

[0020] In some embodiments, in the axial direction of the seal, a size of the second groove ranges from 0.1 mm to 0.5 mm.

[0021] The technical solution of this embodiment provides some size ranges of the second grooves, so that the gas can flow through the second grooves and the negative impact of the second grooves on the strength of the seal can be reduced.

[0022] In some embodiments, the number of the second slots is at least two.

[0023] In the technical solution of this embodiment, the number of the second grooves is at least two, so that the gas in the shell can enter the first groove through different second grooves at different positions, so that the gas can be better discharged outside the shell.

[0024] In some embodiments, the connecting structure is a weld.

[0025] In the technical solution of this embodiment, the connection structure is a weld mark, that is, the sealing member and the inner wall of the first through hole structure are connected by welding to improve the connection stability and sealing performance of the sealing member.

[0026] In a second aspect, an embodiment of the present application further provides a seal, wherein a first groove is recessed on a peripheral side surface of the seal along a radial direction of the seal, and the first groove penetrates the seal along an axial direction of the seal.

[0027] In the technical solution of this embodiment, a first groove is provided on the peripheral side of the seal. When the seal is connected to the first wall through a connecting structure, the gas generated during processing can be discharged to the outside of the outer shell through the first groove to reduce the air pressure difference between the inside and outside of the outer shell, thereby reducing the air pressure that the connecting structure may be subjected to and reducing the risk of damage or deformation of the connecting structure.

[0028] In some embodiments, a ratio of an opening area of ​​the first groove to an area of ​​a peripheral side surface of the seal is greater than or equal to 0.5.

[0029] The technical solution of this embodiment provides some ratios of the opening area of ​​the first groove to the area of ​​the surrounding side surface, so that the first groove can better discharge the gas in the shell to the outside of the shell, so as to better reduce the air pressure difference inside and outside the shell, thereby better reducing the risk of damage and deformation of the connection structure.

[0030] In a third aspect, embodiments of the present application further provide a battery device, comprising the battery cell provided by some embodiments of the first aspect, or the seal provided by some embodiments of the second aspect.

[0031] In a fourth aspect, embodiments of the present application further provide an electrical device, including the battery device provided by some embodiments of the third aspect.

[0032] 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

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0034] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0035] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0036] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0037] Figure 4 A three-dimensional schematic diagram of a seal provided in some embodiments of the present application;

[0038] Figure 5 A schematic top view of a seal provided in some embodiments of the present application;

[0039] Figure 6 A partial cross-sectional schematic diagram of a seal and an end cover provided in some embodiments of the present application;

[0040] Figure 7 A schematic cross-sectional view of a first through-hole structure and a second through-hole structure provided in some embodiments of the present application;

[0041] Figure 8 for Figure 4 A local enlarged schematic diagram of the middle A;

[0042] Fig. 9 A three-dimensional schematic diagram of a seal provided in some other embodiments of the present application.

[0043] The meanings of the marks in the figure are:

[0044] 1000. Vehicles;

[0045] 100. Battery device;

[0046] 10. Box body; 11. First box body; 12. Second box body;

[0047] 20. Battery cell; 21. Shell; 211. First wall; 2111. First through hole structure; 2112. Support plate; 2113. Second through hole structure; 212. Accommodation cavity; 213. Shell; 214. End cover; 22. Electrode assembly; 23. Electrode terminal; 24. Sealing member; 241. First groove; 242. Second groove;

[0048] 30. Connection structure;

[0049] 200, motor;

[0050] 300. Controller. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application are described in detail in conjunction with 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.

[0052] 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.

[0053] 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 meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0054] 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.

[0055] 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.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0060] In current battery cells, an injection hole is usually provided on the battery cell to facilitate the injection of electrolyte into the shell; after the electrolyte is injected, the injection hole usually needs to be sealed by a seal to prevent external impurities from entering the shell through the injection hole.

[0061] During the fixing process of the seal, the seal is usually fixed to the battery cell by welding to close the injection hole. During the electrolyte injection process, residual electrolyte is likely to exist near the injection hole. During the welding process of the seal, the high temperature generated by welding is likely to vaporize the electrolyte and cause the air pressure inside the shell near the seal to increase. As the seal is welded, the gap between the seal and the battery cell is gradually closed, and the gas inside the shell is increasingly difficult to discharge. When the welding of the seal is about to be completed, the air pressure inside the shell is likely to break open the solution in the welding pool, thereby forming an explosion point and solution splashing, and causing welding failure, and the seal cannot completely close the injection hole.

[0062] Based on the above considerations, in order to reduce the risk of explosion points and welding liquid splashing during the welding process of the seal, and also to improve the sealing performance of the seal, an embodiment of the present application provides a battery cell, wherein a first groove is arranged on the peripheral side of the seal; a connecting structure is arranged so that the connecting structure connects the peripheral side of the seal to the inner wall of the first through hole, and at the same time, the connecting structure also isolates the first groove.

[0063] In such a battery cell, the gas generated during the process of connecting the seal to the end cover can be discharged to the outside of the shell through the first groove to reduce the pressure difference between the inside and outside of the shell, thereby reducing the air pressure that the connection structure may be subjected to, and reducing the risk of damage and deformation of the connection structure; in the case where the connection structure is a weld mark formed by welding, this arrangement can also reduce the risk of explosion points and splashing due to pressure difference during welding; at the same time, the first groove is separated by the connection structure, and the seal is fixed to the inside of the first channel structure. The connection structure can separate the first groove to improve the sealing effect of the seal, and at the same time make it difficult for impurities outside the shell to enter the inside of the shell.

[0064] The battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source or in various energy storage systems that use the battery as an energy storage element. The electrical device can 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, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0065] 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.

[0066] 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 is provided inside the vehicle 1000, and the battery may be provided at the bottom, head or tail of the vehicle 1000. The battery may be used to power the vehicle 1000, for example, the battery may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200, and the controller 300 is used to control the battery to power the motor 200, for example, for starting, navigating and driving the vehicle 1000.

[0067] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0068] refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of a battery device 100 provided in some embodiments of the present application.

[0069] The battery apparatus 100 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, in parallel or in mixed connection through a busbar component.

[0070] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0071] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 by a cable tie.

[0072] In some embodiments, the battery device 100 may be a battery pack, which includes a case 10 and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case 10 .

[0073] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0074] As an example, the battery cell assembly may also be accommodated in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0075] As an example, the box 10 may include a first box 11 and a second box 12. The first box 11 and the second box 12 are buckled together to form a closed space inside the box 10 to accommodate the battery cell assembly. The closed space here means to cover or close, which can be sealed or unsealed. The first box 11 can be a top cover or a bottom plate.

[0076] As an example, the box body 10 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 10 to accommodate the battery cell assembly.

[0077] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0078] refer to Figure 3 , Figure 3 A schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. A battery cell 20 may be a secondary battery, which refers to a battery cell 20 that can be used continuously by activating the active material by charging after the battery cell 20 is discharged.

[0079] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0080] As shown in the figure, the battery cell 20 includes a shell 21 , an electrode assembly 22 and other functional components. The shell 21 includes a shell 213 and an end cover 214 .

[0081] The end cap 214 refers to a component that covers the opening of the shell 213 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 214 can be adapted to the shape of the shell 213 to match the shell 213. Optionally, the end cap 214 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 214 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 23 can be provided on the end cap 214. The electrode terminal 23 can be used to electrically connect with the electrode assembly 22 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 214 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 214 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 214 to isolate the electrical connection components in the housing 213 from the end cap 214 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0082] The shell 213 is a component used to cooperate with the end cap 214 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 213 and the end cap 214 can be independent components, and an opening can be set on the shell 213, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 214 at the opening. Without limitation, the end cap 214 and the shell 213 can also be integrated. Specifically, the end cap 214 and the shell 213 can form a common connection surface before other components are put into the shell, and when the interior of the shell 213 needs to be encapsulated, the end cap 214 covers the shell 213. The shell 213 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 213 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 213 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0083] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 213. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body, respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 23 to form a current loop.

[0084] First, reference Figures 4 to 6 The embodiment of the present application provides a battery cell 20, including a shell 21, an electrode assembly 22, a seal 24 and a connection structure 30. The shell 21 is provided with a housing cavity 212, the shell 21 has a first wall 211, and the first wall 211 is provided with a through first through hole structure 2111; the electrode assembly 22 is accommodated in the housing cavity 212; the seal 24 is arranged in the first through hole structure 2111, and a first groove 241 is recessed on the peripheral side surface of the seal 24 along the radial direction of the seal 24, and the first groove 241 penetrates the seal 24 along the axial direction of the seal 24; one side of the connection structure 30 is connected to the inner wall of the first through hole structure 2111, and the other side of the connection structure 30 is connected to the inner wall surface of the first groove 241 and the peripheral side surface of the seal 24, and the connection structure 30 separates the first groove 241 along the radial direction of the seal 24.

[0085] The outer shell 21 refers to a structure for forming an internal environment of the battery cell 20 , and the internal environment formed by the outer shell 21 can be used to accommodate the electrode assembly 22 , electrolyte and other structures. For example, the outer shell 21 may include a housing 213 and an end cap 214 .

[0086] The accommodating chamber 212 refers to a spatial structure formed inside the outer shell 21. The accommodating chamber 212 may be a spatial structure with an opening on one side, that is, the accommodating chamber 212 can be connected to the space outside the outer shell 21 from the opening side. The shape of the opening side of the accommodating chamber 212 may be circular, square or other shapes, and may also be set according to the shape of the outer shell 21. The accommodating chamber 212 is used to accommodate the electrode assembly 22, electrolyte or other structures; the accommodating chamber 212 may be a prismatic spatial structure, a cylindrical spatial structure or a spatial structure of other shapes, and the shape of the accommodating chamber 212 may also be set according to the shape of the outer shell 21.

[0087] The first wall 211 refers to a structure in the outer shell 21 for forming an internal environment. The first wall 211 may be an end cover 214, or a side wall or a bottom wall of the shell 213. The first wall 211 covers the opening side of the accommodating cavity 212 to form an internal environment of the battery cell 20. The shape of the first wall 211 may be square, circular or other shapes, and the shape of the first wall 211 may also be set according to the shape of the outer shell 21. The material of the first wall 211 may include metal, plastic or other materials.

[0088] The electrode assembly 22 is a structure where electrochemical reactions occur in the battery cell 20 , and the housing 213 may contain one or more electrode assemblies 22 .

[0089] The first through hole structure 2111 refers to a hole structure that passes through the first wall 211. When the first wall 211 covers the accommodating cavity 212, the accommodating cavity 212 can be connected with the space outside the shell 21 through the first through hole structure 2111; the first through hole structure 2111 can be a straight hole, a conical hole, a stepped hole or a hole structure of other shapes; the first through hole structure 2111 can be a circular hole, a square hole or a hole structure of other shapes.

[0090] The first through hole structure 2111 is used as a liquid injection hole of the battery cell 20 , and the electrolyte can be injected into the accommodating cavity 212 of the shell 21 through the first through hole structure 2111 .

[0091] The seal 24 refers to a structure in the battery cell 20 for closing the first through hole structure 2111. The seal 24 is arranged in the first through hole structure 2111 to close the first through hole structure 2111, thereby preventing the electrolyte from flowing from the accommodating cavity 212 through the first through hole structure 2111 to the outside of the shell 21, and can also prevent impurities outside the shell 21 from entering the accommodating cavity 212 through the first through hole structure 2111; the seal 24 can be only partially located in the first through hole structure 2111, or it can be completely located in the first through hole structure 2111.

[0092] The seal 24 may be a cylindrical structure, a prismatic structure or a structure of other shapes. The shape of the seal 24 may also be set according to the shape of the first through hole structure 2111 . The seal 24 may be made of metal, plastic or other materials.

[0093] The first groove 241 refers to a groove structure arranged on the circumferential side of the seal 24, and the circumferential side of the seal 24 refers to one side of the seal 24 located in the radial direction of the first through hole structure 2111; the first groove 241 penetrates the seal 24 along the axial direction of the seal 24, so that the accommodating cavity 212 can be connected with the space outside the shell 21 through the first groove 241; the number of the first grooves 241 can be one, or it can be two or more; the first groove 241 can be a square groove, a trapezoidal groove or a groove structure of other shapes, the first groove 241 can be a straight groove and extend along the axial direction of the seal 24, and the first groove 241 can also be a curved groove structure extending in the axial direction of the seal 24 as a reference.

[0094] The connection structure 30 refers to a structure in the battery cell 20 used to connect the seal 24 to the first wall 211. The connection structure 30 can be a glue structure, in which case the seal 24 and the first wall 211 are connected by gluing; the connection structure 30 can also be a welded structure, in which case the seal 24 and the first wall 211 are connected by welding. The connection structure 30 can also be other structures.

[0095] One side of the connection structure 30 is connected to the inner wall of the first through hole structure 2111 , that is, when at least part of the seal 24 is located in the first through hole structure 2111 , the inner wall of the first through hole structure 2111 , that is, the surface of the first through hole structure 2111 facing the seal 24 .

[0096] The other side of the connecting structure 30 is connected to the circumferential side surface of the seal 24 and the inner wall surface of the first groove 241; at a position where the first groove 241 is not provided on the circumferential side surface of the seal 24, the connecting structure 30 is connected to the circumferential side surface of the seal 24 to fix the seal 24 in the first through-hole structure 2111, at which time the connecting structure 30 plays a role of fixing the seal 24 at this position, and at the same time, the connecting structure 30 can also seal the gap between the inner wall surface of the first through-hole structure 2111 and the circumferential side surface of the seal 24; at a position where the first groove 241 is provided on the circumferential side surface of the seal 24, the connecting structure 30 is connected to the inner wall surface of the first groove 241, at which time, in addition to playing a role of fixing the seal 24, the connecting structure 30 can also isolate the first groove 241 to prevent the accommodating chamber 212 from being connected to the space outside the housing 21, that is, the position where the first groove 241 is provided on the circumferential side surface of the seal 24 can also play a role of closing the first groove 241.

[0097] The connection structure 30 is used to close the gap between the seal 24 and the first through-hole structure 2111 , so that the electrolyte in the accommodating cavity 212 is difficult to leak out of the shell 21 , and it is also difficult for debris outside the shell 21 to enter the accommodating cavity 212 through the first through-hole structure 2111 .

[0098] Since the connection structure 30 is used to close the gap between the seal 24 and the first through hole structure 2111, the size of the connection structure 30 in the radial direction of the seal 24 should be equal to the distance between the corresponding circumferential side surface of the seal 24 and the inner wall of the first through hole structure 2111, or equal to the distance between the corresponding inner wall of the first groove 241 and the first through hole structure 2111. In the axial direction of the seal 24, the size of the connection structure 30 can be equal to the size of the seal 24, or smaller or larger than the size of the seal 24.

[0099] In the process of the sealing member 24 being connected to the first wall 211, the connection structures 30 are sequentially arranged along the circumference of the sealing member 24 according to the type of the connection structure 30, and are connected to the circumference of the sealing member 24 and the inner wall of the corresponding first through-hole structure 2111; as the area of ​​the circumferential side surface of the sealing member 24 connected to the connection structure 30 increases, the gap between the sealing member 24 and the inner wall of the first through-hole structure 2111 becomes smaller and smaller, and the resistance of the gas inside the accommodating cavity 212 to be discharged outside the housing 21 becomes larger and larger, and the inner wall of the accommodating cavity 212 becomes smaller and smaller. The greater the pressure difference between the internal air pressure and the space outside the shell 21, the more difficult it is for the connecting structure 30 to connect to the seal 24 and the inner wall of the first through-hole structure 2111; when the connecting structure 30 connects the seal 24 and the last part of the first through-hole structure 2111, that is, when the gap between the seal 24 and the inner wall of the first through-hole structure 2111 is completely closed by the connecting structure 30, the pressure difference between the accommodating cavity 212 and the space outside the shell 21 reaches the maximum, and the connecting structure 30 is prone to detachment, breakage, etc. at this point.

[0100] In the case where the connection structure 30 is a weld mark, that is, when the seal 24 is connected to the inner wall of the first through-hole structure 2111 by welding, when the connection structure 30 connects the seal 24 and the last part of the first through-hole structure 2111, the internal air pressure of the accommodating cavity 212 will cause the molten pool formed by the welding to be unstable, and cause the welding liquid to splash, thereby causing explosion points, etc., and making it difficult to completely seal the seal 24 and the first through-hole structure 2111 at this location.

[0101] In the case where the connecting structure 30 is a glue structure, that is, when the seal 24 is connected to the inner wall of the first through-hole structure 2111 by bonding, when the connecting structure 30 connects the seal 24 and the last part of the first through-hole structure 2111, the internal air pressure of the accommodating cavity 212 will make it difficult for the glue to adhere to the peripheral side walls of the seal 24 and the inner wall of the first through-hole structure 2111, and cause the glue to splash, thereby making it difficult to completely seal the seal 24 and the first through-hole structure 2111 at that location.

[0102] Accordingly, the present embodiment provides a first groove 241. During the process of the connecting structure 30 connecting the seal 24 and the inner wall of the first through hole structure 2111, the gas in the accommodating chamber 212 can flow better to the outside of the outer shell 21 through the first groove 241, so as to reduce the air pressure difference between the inside and outside of the outer shell 21, thereby reducing the air pressure that the connecting structure 30 may be subjected to, and reducing the risk of damage or deformation of the connecting structure 30. In the case where the connecting structure 30 is a weld mark formed by welding, this arrangement can also reduce the risk of explosion points and splashing due to the air pressure difference during welding.

[0103] In the case where there is only one first groove 241, in the process of the connecting structure 30 connecting the seal 24 and the inner wall of the first through-hole structure 2111, the connecting structure 30 can finally close the first groove 241 to reduce the air pressure difference between the accommodating cavity 212 and the space outside the outer shell 21, thereby improving the stability of the connection; in the case where there are multiple first grooves 241, in the process of the connecting structure 30 connecting the seal 24 and the inner wall of the first through-hole structure 2111, the connecting structure 30 can still finally close the first groove 241 to reduce the air pressure difference between the accommodating cavity 212 and the space outside the outer shell 21.

[0104] refer to Figure 4 , Figure 5 In some embodiments, the ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the sealing member 24 is greater than or equal to 0.5.

[0105] The area of ​​the peripheral side surface of the seal 24 refers to the area of ​​the entire peripheral side surface of the seal 24, and the opening area of ​​the first groove 241 refers to the opening area of ​​the first groove 241 on the side facing the peripheral side surface. When the number of the first grooves 241 is two or more, the opening area of ​​the first groove 241 refers to the sum of the opening areas of the first grooves 241; Figure 5 The circumferential side area of ​​the seal 24 is the area formed by the product of the circumference corresponding to the radius R of the seal 24 in the figure and the height of the seal 24, and the opening area of ​​the first groove 241 is the area formed by the product of the arc corresponding to W in the figure and the height of the seal 24.

[0106] The ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the sealing member 24 is greater than or equal to 0.5, that is, the ratio may be 0.5, or 0.6, 0.7, 0.8, 0.9 or other values.

[0107] The opening area of ​​the first groove 241 reflects the ability of the first groove 241 to provide gas circulation. The larger the opening area of ​​the first groove 241 is, the easier it is for the gas to flow from the accommodating cavity 212 through the first groove 241 to the outside of the shell 213 during the process of connecting the sealing member 24 with the connecting structure 30.

[0108] For example, the ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the seal 24 is equal to 0.5. At this time, the gas can easily flow from the accommodating cavity 212 through the first groove 241 to the outside of the outer shell 21, and it is also convenient for the peripheral side surface of the seal 24 to be connected to the inner wall of the first through hole structure 2111.

[0109] For example, the ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the sealing member 24 is equal to 0.9, and at this time, the gas can flow better from the accommodating cavity 212 to the outside of the housing 21 through the first groove 241 .

[0110] This embodiment provides some ratios of the opening area of ​​the first groove 241 to the area of ​​the surrounding side surface, so that the first groove 241 can better discharge the gas in the shell 21 to the outside of the shell 21, so as to better reduce the air pressure difference inside and outside the shell 21, thereby better reducing the risk of damage and deformation of the connecting structure 30.

[0111] refer to Figure 4 , Figure 5 In some embodiments, the number of the first grooves 241 is at least two.

[0112] The number of the first grooves 241 may be one, or may be two or more; when the sum of the cross-sectional area and the opening area of ​​the first grooves 241 is constant, increasing the number of the first grooves 241 can reduce the cross-sectional area and the opening area of ​​a single first groove 241, so as to reduce the amount required for the connecting structure 30 to close a single first groove 241, and can also reduce the gap between the inner wall of the first groove 241 and the inner wall of the first through hole structure 2111, so that the connecting structure 30 can connect more stably and close the gap.

[0113] For example, when there are multiple first grooves 241, the multiple first grooves 241 can be evenly spaced along the circumference of the seal 24; for example, when there are multiple first grooves 241, the multiple first grooves 241 are concentrated on one side of the seal 24. In the process of the connecting structure 30 connecting the seal 24 and the inner wall of the first through hole structure 2111, the connecting structure 30 can finally connect the side of the seal 24 where the first grooves 241 are concentrated, so that each first groove 241 can better allow the gas in the accommodating cavity 212 to flow to the outside of the outer shell 21.

[0114] In this embodiment, the number of the first grooves 241 is two, so that the gas in the outer shell 21 can be discharged from different first grooves 241 at different positions; in the process of connecting the seal 24 to the first wall 211 through the connecting structure 30, the connecting structure 30 separates the first grooves 241 one by one, so that the gas in the outer shell 21 can be better discharged to the outside of the outer shell 21 during the process, so as to better reduce the air pressure difference inside and outside the outer shell 21.

[0115] refer to Figure 4 , Figure 5 In some embodiments, in the radial direction of the seal 24 , the size of the first groove 241 ranges from 0.1 mm to 0.2 mm.

[0116] The radial dimension of the first groove 241 in the seal 24 is also known as the depth of the first groove 241 recessed into the seal 24. Figure 5 The radial dimension of the first groove 241 in the seal 24 is the dimension shown by L in the figure; the radial dimension of the first groove 241 in the seal 24 can be 0.10mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, 0.20mm or other values.

[0117] The radial dimension of the first groove 241 in the seal 24 reflects the ability of the first groove 241 to provide gas circulation. The larger the radial dimension of the first groove 241 in the seal 24, the easier it is for the gas to flow from the accommodating cavity 212 to the outside of the housing 21 through the first groove 241 during the process of the connection structure 30 connecting the seal 24. At the same time, the larger the radial dimension of the first groove 241 in the seal 24, the larger the gap between the inner wall of the first groove 241 and the inner wall of the first through-hole structure 2111, the greater the difficulty of the connection structure 30 connecting the inner wall of the first groove 241 and the first through-hole structure 2111, and the worse the stability of the connection structure 30 in closing the gap between the two.

[0118] Accordingly, the radial dimension range of the first groove 241 in the seal 24 is 0.1 mm to 0.2 mm, which enables the gas to flow more easily from the accommodating cavity 212 to the outside of the outer shell 21 through the first groove 241, and also enables the connecting structure 30 to be more stably connected to the inner wall of the first groove 241 and the first through-hole structure 2111, and to more stably close the gap between the inner wall of the first groove 241 and the first through-hole structure 2111.

[0119] For example, the radial dimension of the first groove 241 in the seal 24 is 0.1 mm. At this time, the connection structure 30 is connected to the inner wall of the first groove 241 and the first through-hole structure 2111 with high stability, and the connection structure 30 can stably close the gap between the inner wall of the first groove 241 and the first through-hole structure 2111; at the same time, in the process of the connection structure 30 connecting the seal 24, the gas in the accommodating chamber 212 can also flow from the accommodating chamber 212 through the first groove 241 to the outside of the outer shell 21.

[0120] For example, the radial dimension of the first groove 241 in the seal 24 is 0.15 mm. At this time, during the process of connecting the connecting structure 30 to the seal 24, the gas in the accommodating cavity 212 can also flow more easily from the accommodating cavity 212 to the outside of the outer shell 21 through the first groove 241; at the same time, the connecting structure 30 can be more stably connected to the inner wall of the first groove 241 and the first through hole structure 2111.

[0121] For example, the radial dimension of the first groove 241 in the seal 24 is 0.2 mm. At this time, during the process of connecting the seal 24 with the connecting structure 30, the gas in the accommodating cavity 212 can more easily flow from the accommodating cavity 212 to the outside of the housing 21 through the first groove 241.

[0122] This embodiment provides some size ranges of the first grooves 241 in the radial direction of the seal 24, so that the radial size of a single first groove 241 is smaller, so as to reduce the difficulty of the connecting structure 30 to isolate the single first groove 241, so that the connecting structure 30 can better isolate the first groove 241 and can improve the sealing performance of the seal 24 to the first through hole structure 2111; at the same time, in the process of the connecting structure 30 connecting the seal 24, this setting also enables the gas in the accommodating cavity 212 to flow from the accommodating cavity 212 through the first groove 241 to the outside of the outer shell 21.

[0123] refer to Figure 6 , Figure 7 In some embodiments, a support plate 2112 connected to the inner wall of the first through hole structure 2111 is provided in the first through hole structure 2111, a through second through hole structure 2113 is provided on the support plate 2112, and the first groove 241 is connected to the second through hole structure 2113; the sealing member 24 is provided on the side of the support plate 2112 away from the accommodating cavity 212.

[0124] The support plate 2112 refers to a structural member on the first wall 211 and is arranged in the first through hole structure 2111. The support plate 2112 is connected to the inner wall of the first through hole structure 2111, that is, the support plate 2112 is connected to the first wall 211. The support plate 2112 can be connected to the inner wall of the first through hole structure 2111 by welding, bonding or other means. The support plate 2112 can also be integrally formed with the first wall 211 and located in the first through hole structure 2111; the shape of the support plate 2112 can be circular, square or other shapes, and the shape of the support plate 2112 can also be set according to the shape of the first through hole structure 2111; the material of the support plate 2112 can include metal, plastic or other materials.

[0125] The second through hole structure 2113 refers to a hole structure that passes through the support plate 2112, that is, one end of the second through hole structure 2113 can be connected to the first through hole structure 2111, and the other end of the second through hole structure 2113 can be connected to the accommodating cavity 212. In the process of injecting electrolyte into the accommodating cavity 212, the electrolyte can enter the accommodating cavity 212 through the first through hole structure 2111 and the second through hole structure 2113. In the process of discharging the gas in the accommodating cavity 212 to the outside of the outer shell 21, the gas can be discharged to the outside of the outer shell 21 through the second through hole structure 2113 and the first groove 241.

[0126] The second through hole structure 2113 may be a straight hole, a tapered hole, a stepped hole, or a hole structure of other shapes. The second through hole structure 2113 may be a round hole, a square hole, or a hole structure of other shapes.

[0127] Since the support plate 2112 is disposed in the first through hole structure 2111 and the second through hole structure 2113 is disposed on the support plate 2112 , the inner diameter of the second through hole structure 2113 is smaller than the inner diameter of the first through hole structure 2111 .

[0128] The seal 24 is arranged on the side of the support plate 2112 away from the accommodating chamber 212. The seal 24 can be connected to the support plate 2112. The seal 24 can be connected to the support plate 2112 by bonding, welding or other means. The seal 24 can also be against the support plate 2112 or only contact with the support plate 2112. At this time, the support plate 2112 can play the role of supporting the seal 24 to cooperate with the connecting structure 30 to fix the seal 24 in the first through hole structure 2111; the seal 24 can also be spaced apart from the support plate 2112, that is, the seal 24 can be suspended relative to the support member. At this time, the seal 24 is fixed by the connecting structure 30, and the support plate 2112 mainly serves as a redundant structure to support the seal 24 when the connecting structure 30 fails.

[0129] In the process of connecting the sealing member 24 to the inner wall of the first through hole structure 2111 through the connecting structure 30 , the sealing member 24 may be placed on the supporting plate 2112 first to facilitate subsequent operations by the staff.

[0130] In this embodiment, a support plate 2112 is disposed in the first through hole structure 2111 to support the seal 24 through the support plate 2112 and limit the displacement of the seal 24 , thereby facilitating the installation and fixation of the seal 24 .

[0131] refer to Figures 6 to 8 In some embodiments, a second groove 242 is provided on the side of the seal 24 facing the support plate 2112 , one end of the second groove 242 is connected to the first groove 241 , and the other end of the second groove 242 is connected to the second through hole structure 2113 .

[0132] The second groove 242 refers to a groove structure provided on the seal 24. The second groove 242 can be a square groove, a trapezoidal groove or a groove structure of other shapes. The second groove 242 can be a straight groove, a curved groove structure or a groove structure of other shapes. The number of the second grooves 242 can be one, or two or more.

[0133] The second groove 242 is arranged on the side of the seal 24 facing the support plate 2112, that is, the second groove 242 is arranged on the side of the seal 24 facing the second through hole structure 2113; one end of the second groove 242 is connected to the first groove 241, and the other end of the second groove 242 is connected to the second through hole structure 2113. When the seal 24 is connected to the inner wall of the first through hole structure 2111, this arrangement enables the gas in the accommodating cavity 212 to be discharged from the second through hole structure 2113 through the second groove 242 and the first groove 241 to the outside of the outer shell 21.

[0134] The number of the second grooves 242 can be the same as the number of the first grooves 241, so that the second grooves 242 and the first grooves 241 correspond one to one; the number of the second grooves 242 can also be less than the number of the first grooves 241, in which case one second groove 242 can be connected to one or more first grooves 241; the number of the second grooves 242 can also be greater than the number of the first grooves 241, in which case one first groove 241 can be connected to one or more second grooves 242.

[0135] Due to the existence of the support plate 2112, when the seal 24 is connected to the inner wall of the first through hole structure 2111, when the seal 24 abuts against or touches the support plate 2112, the second through hole structure 2113 will be closed by the seal 24, and it is difficult for the gas in the accommodating cavity 212 to enter the first through hole structure 2111 through the second through hole structure 2113; when the seal 24 and the support plate 2112 are spaced apart, the gap between the seal 24 and the support plate 2112 is usually smaller, and the resistance to gas flow is larger.

[0136] Accordingly, in this embodiment, a second groove 242 is provided on the sealing member 24 so that the gas in the outer shell 21 can enter the first groove 241 through the second groove 242 and can be discharged to the outside of the outer shell 21 through the first groove 241; the provision of the second groove 242 can reduce the interference of the support plate 2112 on the discharge of the gas in the outer shell 21 to the outside of the outer shell 21.

[0137] refer to Figures 6 to 8 In some embodiments, the second groove 242 extends in the radial direction of the seal 24 , and an end of the second groove 242 away from the first groove 241 extends to a side of the second through hole structure 2113 away from the accommodating cavity 212 .

[0138] The second groove 242 extends radially of the seal 24. Since the first groove 241 is arranged on the circumferential side of the seal 24, and one end of the second groove 242 is connected to the first groove 241, the second groove 242 extends radially of the seal 24, that is, the second groove 242 extends in the direction of the axis of the seal 24.

[0139] One end of the second groove 242 away from the first groove 241 extends to the side of the second through hole structure 2113 away from the accommodating cavity 212, that is, the end of the second groove 242 away from the first groove 241 can correspond to the second through hole structure 2113; when the sealing member 24 is located above the supporting member, this arrangement can make the end of the second groove 242 away from the first groove 241 be located above the second through hole structure 2113, so that the second groove 242 can be connected to the second through hole structure 2113.

[0140] For example, the first through hole structure 2111 is a circular straight hole structure, the support plate 2112 closes the first through hole structure 2111, the second through hole structure 2113 is a circular hole structure and is coaxial with the first through hole structure 2111, and the length direction of the second groove 242 is parallel to the radial direction of the seal 24; at this time, the end of the second groove 242 away from the first groove 241 extends to the side of the second through hole structure 2113 away from the accommodating cavity 212, that is, the length of the second groove 242 is greater than the distance between the inner wall of the second through hole structure 2113 and the inner wall of the first through hole structure 2111, so that the end of the second groove 242 away from the first groove 241 can not be blocked by the support plate 2112 and is connected to the second through hole structure 2113, so that the gas can be discharged from the accommodating cavity 212 through the second through hole structure 2113, the second groove 242 and the first groove 241 to the outside of the shell 21.

[0141] This embodiment provides some specific structures of the second groove 242 so that the second groove 242 can be connected to the second through hole structure 2113 and the first groove 241, so that the gas in the shell 21 can be discharged to the outside through the second through hole structure 2113, the second groove 242 and the first groove 241.

[0142] refer to Figure 6 In some embodiments, in the axial direction of the seal 24 , the size of the second groove 242 ranges from 0.1 mm to 0.5 mm.

[0143] The second groove 242 is disposed on the side of the seal 24 facing the second through hole structure 2113. The dimension of the second groove 242 in the axial direction of the seal 24 is also the depth of the second groove 242. Figure 6The dimension shown in H in the figure is the dimension of the second groove 242 in the axial direction of the seal 24; the dimension range of the second groove 242 in the axial direction of the seal 24 is 0.1mm~0.5mm, and the dimension can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm or other values.

[0144] The axial dimension of the second groove 242 of the seal 24 reflects the ability of the second groove 242 to provide gas circulation. The larger the axial dimension of the second groove 242 of the seal 24, the stronger the performance of the second groove 242 for gas circulation and the smaller the resistance to gas flow. However, along the side of the seal 24 facing the second through hole structure 2113, the larger the axial dimension of the second groove 242 of the seal 24, the lower the strength of the seal 24.

[0145] Accordingly, the size range of the second groove 242 in the axial direction of the seal 24 is 0.1mm~0.5mm; during the process of connecting the seal 24 with the connecting structure 30, this arrangement enables the gas to enter the first groove 241 from the second groove 242 more easily and flow to the outside of the outer shell 21; at the same time, this arrangement also enables the seal 24 to have a certain strength to meet the sealing requirements of the first through hole structure 2111.

[0146] For example, the axial dimension of the second groove 242 in the seal 24 is 0.1 mm, the seal 24 is relatively strong, and the seal 24 is not easily damaged by impurities outside the shell 21, resulting in failure of the seal of the first through hole structure 2111; at the same time, in the process of connecting the seal 24 by the connecting structure 30, the gas in the accommodating cavity 212 can also flow from the accommodating cavity 212 through the second groove 242 and the first groove 241 to the outside of the shell 21.

[0147] For example, the axial dimension of the second groove 242 in the seal 24 is 0.3 mm. At this time, during the process of connecting the seal 24 with the connecting structure 30, the gas in the accommodating cavity 212 can also flow more easily from the accommodating cavity 212 through the second groove 242 and the first groove 241 to the outside of the outer shell 21; at the same time, the seal 24 can also have a certain strength.

[0148] For example, the axial dimension of the second groove 242 in the seal 24 is 0.5 mm. At this time, during the process of connecting the seal 24 with the connecting structure 30, the gas in the accommodating cavity 212 can more easily flow from the accommodating cavity 212 through the second groove 242 and the first groove 241 to the outside of the housing 21.

[0149] This embodiment provides some size ranges of the second grooves 242 , so that the gas can flow through the second grooves 242 while reducing the negative impact of the second grooves 242 on the strength of the sealing member 24 .

[0150] refer to Fig. 9 In some embodiments, the number of the second grooves 242 is at least two.

[0151] The number of the second grooves 242 may be two, or three or more; since the second grooves 242 are mainly used to communicate with the first grooves 241 so that the gas in the second through-hole structure 2113 can enter the first groove 241 through the second grooves 242, the number of the second grooves 242 may correspond to the first grooves 241, or may not correspond; at the same time, since no additional connecting structure 30 is required to be arranged in the second grooves 242, the number and cross-sectional area of ​​the second grooves 242 do not need to consider the influence of connection stability, etc., that is, the number of the second grooves 242 can be small, and the cross-sectional area of ​​a single second groove 242 can be larger, so that one second groove 242 can correspond to and connect multiple first grooves 241, and the number of the second grooves 242 can also be large, and the cross-sectional area of ​​a single second groove 242 can be small, so that the second grooves 242 can correspond one-to-one with the first grooves 241.

[0152] For example, the number of the second grooves 242 may be four, and the four second grooves 242 are evenly spaced and arranged along the circumference of the sealing member 24 .

[0153] In this embodiment, the number of the second grooves 242 is at least two, so that the gas in the housing 21 can enter the first groove 241 through different second grooves 242 at different positions, so that the gas can be better discharged outside the housing 21.

[0154] In some embodiments, the connection structure 30 is a weld mark.

[0155] The weld mark refers to the structure formed during the welding process between the first wall 211 and the seal 24, that is, the first wall 211 and the seal 24 are connected by welding to form a connection structure 30; the weld mark may be a structure formed by laser welding, or a structure formed by brazing or other welding methods; according to different welding methods, the weld mark may include a structure formed after partial structures of the first wall 211 and the seal 24 are melted and solidified, or may include a structure formed after other external structures are melted (such as brazing material) and solidified; during the welding process, the flowing solder liquid can fill the gaps between the inner wall of the first through hole structure 2111 and the inner wall of the seal 24, and between the inner wall of the first through hole structure 2111 and the inner wall of the first groove 241, so as to achieve a sealing effect.

[0156] In this embodiment, the connection structure 30 is a weld mark, that is, the sealing member 24 and the inner wall of the first through hole structure 2111 are connected by welding to improve the connection stability and sealing performance of the sealing member 24 .

[0157] In some embodiments, the battery cell 20 includes a housing 21 , a first wall 211 , and an electrode assembly 22 .

[0158] The housing 21 defines a receiving cavity 212 , and the electrode assembly 22 is received in the receiving cavity 212 . The first wall 211 is connected to the housing 21 and covers the opening side of the receiving cavity 212 .

[0159] A first through hole structure 2111 is provided on the first wall 211, and the first through hole structure 2111 passes through the first wall 211, and the first through hole structure 2111 is a circular straight hole structure; a support plate 2112 connected to the inner wall of the first through hole structure 2111 is provided in the first through hole structure 2111, and the support plate 2112 closes the first through hole structure 2111; a second through hole structure 2113 is provided on the support plate 2112, and the second through hole structure 2113 is a circular hole structure and is coaxial with the first through hole structure 2111.

[0160] The first through hole structure 2111 contains a sealing member 24 . The sealing member 24 is a cylindrical structure. One end of the sealing member 24 facing the support plate 2112 contacts the support plate 2112 .

[0161] A plurality of first grooves 241 are evenly spaced on the circumferential side surface of the seal 24, and the first grooves 241 penetrate the seal 24 along the axial direction of the seal 24; a plurality of second grooves 242 are provided on the side of the seal 24 facing the accommodating cavity 212, and the plurality of second grooves 242 are evenly arranged along the circumference of the seal 24, one end of the second groove 242 is connected to the first groove 241, and the other end of the second groove 242 extends along the radial direction of the seal 24 to above the second through hole structure 2113.

[0162] The circumferential side surface of the seal 24 and the inner wall surface of the first groove 241 are connected to the inner wall of the first through-hole structure 2111 by welding to form a connecting structure 30, which seals the gap between the circumferential side surface of the seal 24 and the inner wall of the first through-hole structure 2111, and seals the gap between the inner wall surface of the first groove 241 and the inner wall of the first through-hole structure 2111.

[0163] Second, reference Figure 4 , Figure 5 The embodiment of the present application further provides a seal 24 , wherein a first groove 241 is recessed on the peripheral side surface of the seal 24 along the radial direction of the seal 24 , and the first groove 241 penetrates the seal 24 along the axial direction of the seal 24 .

[0164] The seal 24 provided in this embodiment is the seal 24 provided in some embodiments of the first aspect, wherein the first groove 241 refers to a groove structure arranged on the peripheral side of the seal 24, and the first groove 241 penetrates the seal 24 along the axial direction of the seal 24; the number of the first grooves 241 can be one, or can be two or more; the first groove 241 can be a square groove, a trapezoidal groove or a groove structure of other shapes, the first groove 241 can be a straight groove and extend along the axial direction of the seal 24, and the first groove 241 can also be a curved groove structure extending in the axial direction of the seal 24 as a reference.

[0165] In this embodiment, a first groove 241 is provided on the peripheral side of the seal 24. When the seal 24 is connected to the first wall 211 through the connecting structure 30, the gas generated during processing can be discharged to the outside of the outer shell 21 through the first groove 241 to reduce the air pressure difference between the inside and outside of the outer shell 21, thereby reducing the air pressure that the connecting structure 30 may be subjected to, and reducing the risk of damage or deformation of the connecting structure 30.

[0166] refer to Figure 4 , Figure 5 In some embodiments, the ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the sealing member 24 is greater than or equal to 0.5.

[0167] The area of ​​the peripheral side surface of the seal 24 refers to the area of ​​the entire peripheral side surface of the seal 24, and the opening area of ​​the first groove 241 refers to the opening area of ​​the first groove 241 on the side facing the peripheral side surface. When the number of the first grooves 241 is two or more, the opening area of ​​the first groove 241 refers to the sum of the opening areas of the first grooves 241; Figure 5 The circumferential side area of ​​the seal 24 is the area formed by the product of the circumference corresponding to the radius R of the seal 24 in the figure and the height of the seal 24, and the opening area of ​​the first groove 241 is the area formed by the product of the arc corresponding to W in the figure and the height of the seal 24.

[0168] The ratio of the opening area of ​​the first groove 241 to the area of ​​the peripheral side surface of the sealing member 24 is greater than or equal to 0.5, that is, the ratio may be 0.5, or 0.6, 0.7, 0.8, 0.9 or other values.

[0169] The opening area of ​​the first groove 241 reflects the ability of the first groove 241 to provide gas circulation. The larger the opening area of ​​the first groove 241 is, the easier it is for the gas to flow through the first groove 241 to the outside of the housing 21 .

[0170] This embodiment provides some ratios of the opening area of ​​the first groove 241 to the area of ​​the surrounding side surface, so that the first groove 241 can better discharge the gas in the shell 21 to the outside of the shell 21, so as to better reduce the air pressure difference inside and outside the shell 21, thereby better reducing the risk of damage and deformation of the connecting structure 30.

[0171] In a third aspect, embodiments of the present application further provide a battery device 100 , including the battery cell 20 provided by some embodiments of the first aspect, or the seal 24 provided by some embodiments of the second aspect.

[0172] In the battery cell 20, the sealant 24 can better seal the first through-hole structure 2111, so that the electrolyte in the battery cell 20 is not easy to flow out of the battery cell 20, and impurities outside the battery cell 20 are not easy to enter the battery cell 20; during the connection process of the sealant 24, the battery cell 20 can reduce the risks of negative situations such as explosion points and welding spatter, and can also enable the sealant 24 to be more stably connected to the first wall 211, and enable the sealant 24 to have a better sealing effect, thereby improving the stability of the battery cell 20, thereby improving the stability of the entire battery device 100.

[0173] In a fourth aspect, embodiments of the present application further provide an electrical device, including the battery device 100 provided in some embodiments of the third aspect.

[0174] The electrical device provided in the embodiment of the present application can be applicable to various electrical devices using the battery device 100, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0175] 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 battery cell, characterized in that: include: A housing, wherein a receiving cavity is provided in the housing, the housing has a first wall, and a first through hole structure is provided on the first wall; An electrode assembly, contained in the containing cavity; A sealing member is disposed in the first through hole structure, a first groove is concavely disposed on a peripheral side surface of the sealing member along a radial direction of the sealing member, and the first groove penetrates the sealing member along an axial direction of the sealing member; A connecting structure, one side of which is connected to the inner wall of the first through hole structure, the other side of which is connected to the inner wall surface of the first groove and the peripheral side surface of the seal, and the connecting structure separates the first groove along the radial direction of the seal.

2. The battery cell according to claim 1, characterized in that: A ratio of an opening area of ​​the first groove to an area of ​​a peripheral side surface of the seal is greater than or equal to 0.

5.

3. The battery cell according to claim 1, characterized in that: The number of the first grooves is at least two.

4. The battery cell according to claim 1, characterized in that: In the radial direction of the seal, the size of the first groove ranges from 0.1 mm to 0.2 mm.

5. The battery cell according to claim 1, characterized in that: A support plate connected to the inner wall of the first through-hole structure is provided in the first through-hole structure, a second through-hole structure is provided on the support plate, and the first groove is connected to the second through-hole structure; The sealing member is arranged on a side of the support plate away from the accommodating cavity.

6. The battery cell according to claim 5, characterized in that: A second groove is provided on a side of the sealing member facing the support plate, one end of the second groove is connected to the first groove, and the other end of the second groove is connected to the second through hole structure.

7. The battery cell according to claim 6, characterized in that: The second groove extends in a radial direction of the sealing member, and an end of the second groove facing away from the first groove extends to a side of the second through hole structure facing away from the accommodating cavity.

8. The battery cell according to claim 6 or 7, characterized in that: In the axial direction of the seal, the size of the second groove ranges from 0.1 mm to 0.5 mm.

9. The battery cell according to claim 6, characterized in that: The number of the second grooves is at least two.

10. The battery cell according to claim 1, characterized in that: The connection structure is a weld print.

11. A sealing member, characterized in that: A first groove is concavely formed on the peripheral side surface of the seal along the radial direction of the seal, and the first groove penetrates the seal along the axial direction of the seal.

12. The seal according to claim 11, characterized in that A ratio of an opening area of ​​the first groove to an area of ​​a peripheral side surface of the seal is greater than or equal to 0.

5.

13. A battery device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 10, or the seal according to claim 11 or 12.

14. An electrical device, characterized in that: Comprising the battery device as claimed in claim 13.

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