Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell, an electrode assembly, an electrode terminal and a sealing piece, the shell comprises a wall part, and the wall part is provided with an electrode lead-out hole; the electrode assembly is arranged in the shell; at least part of the electrode terminal is located on the side, away from the electrode assembly, of the wall part, and the orthographic projection of the electrode terminal covers the orthographic projection of the electrode leading-out hole in the thickness direction of the wall part. At least part of the sealing element surrounds the electrode lead-out hole and is arranged between the wall part and the electrode terminal, the outer side of the wall part is provided with a convex part protruding towards the electrode terminal, and in the thickness direction, part of the sealing element is clamped between the convex part and the electrode terminal. The battery monomer provided by the embodiment of the utility model can improve the reliability.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] The development of battery technology must take into account multiple design factors at the same time. For example, how to improve battery reliability is an important research direction in the battery field. Utility Model Content

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery cell.

[0005] In the first aspect, the present application provides a battery cell, including a shell, an electrode assembly, an electrode terminal and a seal, the shell including a wall portion, the wall portion being provided with an electrode lead-out hole; the electrode assembly being arranged in the shell; at least a portion of the electrode terminal being located on a side of the wall portion facing away from the electrode assembly, and in the thickness direction of the wall portion, an orthographic projection of the electrode terminal covers an orthographic projection of the electrode lead-out hole; at least a portion of the seal surrounds the electrode lead-out hole and is arranged between the wall portion and the electrode terminal, wherein the outer side of the wall portion has a convex portion protruding toward the electrode terminal, and in the thickness direction of the wall portion, a portion of the seal is clamped between the convex portion and the electrode terminal.

[0006] In the technical solution of the embodiment of the present application, the seal is at least partially pressed against one side surface of the wall portion, and in the area where the two are in contact, the wall portion is provided with a protruding convex portion. When the electrode terminal is displaced or the seal is heated, the wall portion is likely to be subjected to a force applied to a side away from the seal. By providing a protruding structure, the force can be dispersed to both sides and the structural strength of the compressed portion can be increased, thereby reducing the possibility of deformation of the wall portion and improving the stability and reliability of the battery cell.

[0007] According to some embodiments of the present application, the convex portion surrounds the electrode lead-out hole and extends completely along the ring shape, which can improve the sealing reliability of the sealing element and reduce the possibility of external dust or water vapor entering the interior of the housing.

[0008] According to some embodiments of the present application, at least part of the surface of the convex portion against the sealing member is an arc-shaped surface. Providing at least part of the outer surface of the convex portion as an arc-shaped surface can improve the structural strength of the convex portion, and can make the force applied to it more evenly distributed along the curved surface, thereby reducing the force applied to the adjacent areas on both sides of the convex portion.

[0009] In some embodiments according to the embodiments of the present application, the convex portion forms a first cross-sectional pattern in a cross-section perpendicular to its own extending direction, and one side edge of the first cross-sectional pattern close to the electrode terminal is arc-shaped. The surface of the convex portion in contact with the seal can be an arc surface, so that the force is more evenly distributed and it is convenient for processing.

[0010] In some embodiments according to the embodiments of the present application, a mating groove is provided on one side of the seal close to the convex portion, and the convex portion extends into the mating groove. In the thickness direction, the orthographic projection of the mating groove covers the orthographic projection of the convex portion. The seal can have a mating groove corresponding to the convex portion, and embedding the convex portion into the mating groove can further improve the tightness of the combination of the two, thereby improving the reliability of the seal.

[0011] In some embodiments according to the embodiments of the present application, a recess is provided on the inner side of the wall portion facing the electrode assembly, and the recess is recessed in a direction close to the electrode terminal; in the thickness direction, the position of the recess corresponds to the position of the convex portion. Providing a recess on the side of the wall portion facing away from the convex portion can make the overall thickness of the wall portion uniform, and it can be obtained by sheet metal processes such as stamping or bending, improving the processing efficiency and reducing the processing cost.

[0012] In some embodiments according to the embodiments of the present application, in the thickness direction, the extending dimension of the convex portion is L1, and in the radial direction of the electrode lead-out hole, the extending dimension of the convex portion is L2; 0.05 ≤ L1 / L2 ≤ 1 / 1.5. Making the width and thickness of the convex portion have a suitable dimensional ratio, so that the convex portion has good load-bearing capacity.

[0013] In some embodiments according to the embodiments of the present application, in the thickness direction, the extending dimension of the convex portion is L1, and 0.3 mm ≤ L1 ≤ 3 mm. Making the convex portion have an appropriate thickness, and effectively improving the structural strength and stability of the wall portion without interfering with other components such as the electrode terminal.

[0014] In some embodiments according to the embodiments of the present application, the wall portion includes a connection area provided with a convex portion and a main body area staggered from the convex portion. The thickness of the connection area is L3, and the thickness of the main body area is L4; 0.6 ≤ L3 / L4 ≤ 1.5. Adjusting the thickness ratio between the position of the wall portion provided with the convex portion and the position not provided with the convex portion, so that the structural strength of the wall portion is more uniform.

[0015] In some embodiments according to the embodiments of the present application, in the radial direction of the electrode lead-out hole, the width of the convex portion is L2, and the width of the area where the seal abuts against the wall portion is L5; 0.7 ≤ L2 / L5 ≤ 1.3. Making the width of the convex portion close to the width of the abutting area, so that the acting force can be concentratedly applied to the convex portion and then effectively dispersed to both sides.

[0016] According to some embodiments of the embodiments of the present application, a positioning portion is further protrudingly provided on one side surface of the wall portion facing the electrode terminal. The seal is provided with a positioning groove, and the positioning portion extends into the positioning groove. The positioning portion is provided between the electrode lead-out hole and the convex portion. The provision of the mutually matching positioning portion and positioning groove can improve the alignment accuracy between the seal and the wall portion, and further improve the alignment accuracy between the area to be abutted of the seal and the convex portion, making the sealing more reliable.

[0017] According to some embodiments of the embodiments of the present application, in the thickness direction, the extension dimension of the positioning portion is greater than the extension dimension of the convex portion. The positioning portion can have a certain extension dimension in the thickness direction and be embedded in the positioning groove, further stabilizing the relative position of the seal and the wall portion in the radial direction of the electrode lead-out hole.

[0018] According to some embodiments of the embodiments of the present application, the electrode terminal is located on the side of the wall portion facing away from the electrode assembly. The electrode terminal is protrudingly provided to facilitate electrical connection between the battery cell and external components.

[0019] According to some embodiments of the embodiments of the present application, the battery cell further includes an insulating member and a fixing member. The insulating member at least partially surrounds the electrode terminal and is connected to the electrode terminal. The fixing member is connected between the wall portion and the insulating member. The electrode terminal is supported and fixed by the insulating member and the fixing member, thereby stabilizing the position of the electrode terminal and making the structure of the battery cell stable and reliable.

[0020] According to some embodiments of the embodiments of the present application, the insulating member is disposed around the electrode terminal. The insulating member is provided with a connection groove, and the connection groove at least partially extends in the radial direction of the electrode lead-out hole. The fixing member extends into the connection groove. By providing the connection groove and the annular insulating member, the connection between the insulating member, the electrode terminal, and the fixing member can be made stable and reliable.

[0021] According to some embodiments of the embodiments of the present application, the housing includes a housing body and an end cover. The housing body has an opening, and the end cover covers the opening; the wall portion is provided on the end cover. Disposing the electrode terminal and the electrode lead-out hole on the end cover can facilitate its processing and replacement, and can be more conveniently connected to the electrode assembly.

[0022] In a second aspect, the present application provides a battery, including the battery cell according to any one of the embodiments of the first aspect.

[0023] In a third aspect, the present application provides an electrical device, including the battery according to any one of the embodiments of the second aspect. The battery is used to provide electrical energy. Description of the Drawings

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Also, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 Schematic diagram of a vehicle provided by some embodiments of the present application;

[0026] Figure 2 Explosion diagram of a battery provided by some embodiments of the present application;

[0027] Figure 3 Structural diagram of a battery cell provided by some embodiments of the present application;

[0028] Figure 4 Explosion diagram of a battery cell provided by some embodiments of the present application;

[0029] Figure 5 Is Figure 3 The cross-sectional view at the indicated A - A';

[0030] Figure 6 Is Figure 5 The enlarged view of the indicated area P;

[0031] Figure 7 Is Figure 6 The enlarged view of the indicated area Q.

[0032] Reference numerals:

[0033] 1000 - Vehicle;

[0034] 100 - Battery cell; 200 - Battery; 300 - Controller; 400 - Motor;

[0035] 10 - Housing; 20 - Electrode assembly; 30 - Electrode terminal; 40 - Seal; 50 - Insulator; 60 - Fixing member; 70 - Box body;

[0036] 11 - Wall portion; 12 - Shell; 13 - End cover; 41 - Fitting groove; 42 - Positioning groove; 71 - First box body portion; 72 - Second box body portion; 73 - Accommodating portion;

[0037] 111 - Electrode lead-out hole; 112 - Convex portion; 113 - Concave portion; 114 - Connection area; 115 - Main body area; 116 - Positioning portion; 121 - Opening;

[0038] X - Thickness direction. Detailed implementation manners

[0039] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0042] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" 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 simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0044] In the description of the embodiments of this application, the term "a plurality" 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).

[0045] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0047] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging so that the active material can be reused.

[0048] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application do not limit this.

[0049] Generally, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode.

[0050] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode, and can play a role in preventing short circuit between the positive and negative electrodes, and at the same time allows active ions to pass through.

[0051] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector.

[0052] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector.

[0053] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0054] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0055] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0056] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode sheet and the negative electrode sheet, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0057] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like or solid.

[0058] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0059] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0060] In some embodiments, the electrode assembly is a stacked structure.

[0061] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be respectively provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0062] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0063] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in a stacked manner.

[0064] As an example, a plurality of separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0065] As an example, the separators can be continuously provided and are disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0066] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, or the like.

[0067] In some embodiments, the electrode assembly is provided with tabs. The tabs can conduct the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0068] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0069] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc.

[0070] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity.

[0071] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0072] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells. The battery cells or battery modules are accommodated in the box body.

[0073] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0074] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0075] In the battery cell, the electrode assembly is usually disposed in the housing, and an electrode lead-out hole and an electrode terminal are provided on the housing to achieve electrical connection between the electrode assembly and external components. To prevent external dust and other impurities from entering the housing and contaminating the electrolyte, a seal is usually provided at the electrode lead-out hole, and the seal is at least partially clamped between the housing and the electrode terminal to achieve a good sealing effect.

[0076] However, when connecting the electrode terminal to an external component, welding is usually required, which easily heats the sealing ring during this process. At the same time, heat is generated during the use of the battery cell, and there is also a possibility of heating the sealing ring. The sealing ring is usually made of a material with a certain elasticity such as rubber, and usually expands when heated, and exerts a force pointing to the electrode assembly on a partial area of the outer shell around the electrode lead-out hole, resulting in local sinking or tilting of the outer shell, reducing the compression amount of the seal, and further reducing the sealing reliability of the seal.

[0077] In view of this, the embodiments of the present application provide a technical solution, which disperses the acting force by setting a convex structure in the area where the outer shell abuts against the seal, reducing the possibility of the outer shell being deformed under pressure, thereby improving the reliability of the battery.

[0078] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries. The electrical devices are, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. Among them, the spacecraft is, for example, an airplane, a rocket, a space shuttle, and a spaceship, etc. The electric toys include, for example, fixed or mobile electric toys. Specifically, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. Specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0079] The battery cells described in the embodiments of the present application are not limited to the above-described electrical devices. However, for the sake of simplicity of description, the following embodiments will be described by taking an electric vehicle as an example.

[0080] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 200 can be arranged inside the vehicle 1000. Specifically, for example, the battery 200 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery 200 can be used for the power supply of the vehicle 1000. For example, the battery 200 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 300 and a motor 400. The controller 300 is used to control, for example, the power supply of the battery to the motor 400. The battery can be used for the start-up, navigation, etc. of the vehicle 1000. Of course, the battery 200 can also be used to drive the vehicle 1000 to travel, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0081] Figure 2 An explosion schematic diagram of the battery 200 provided by some embodiments of the present application. As Figure 2 shown, the battery 200 includes a box body 70 and battery cells 100, and the battery cells 100 are accommodated in the box body 70.

[0082] The box body 70 is used to accommodate the battery cells 100, and the box body 70 can have various structures. In some embodiments, the box body 70 may include a first box body part 71 and a second box body part 72. The first box body part 71 and the second box body part 72 cover each other, and the first box body part 71 and the second box body part 72 jointly define a receiving part 73 for accommodating the battery cells. The second box body part 72 can be a hollow structure with one end open, and the first box body part 71 is a plate-like structure. The first box body part 71 covers the open side of the second box body part 72 to form a box body with the receiving part 73; both the first box body part 71 and the second box body part 72 can also be hollow structures with one side open, and the open side of the first box body part 71 covers the open side of the second box body part 72 to form a box body 70 with the receiving part 73. Of course, the first box body part 71 and the second box body part 72 can have various shapes, such as a cylinder, a cuboid, etc.

[0083] In the battery 200, the number of battery cells 100 can be one or more. If there are multiple battery cells 100, the multiple battery cells 100 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 100. The multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 100 is accommodated in the box body 70; of course, it can also be that multiple battery cells 100 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 70.

[0084] In some embodiments, there are multiple battery cells 100, and the multiple battery cells 100 are first connected in series, in parallel, or in a mixed connection to form battery modules. Then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 70.

[0085] Next, in combination with the attached Figure 3 to the attached Figure 7 the structure of the battery cell 100 will be described.

[0086] Please refer to Figures 3 to 6 , Figure 3 a schematic diagram of the structure of the battery cell provided by some embodiments of the present application, Figure 4 an explosion schematic diagram of the battery cell provided by some embodiments of the present application, Figure 5 is Figure 3 a cross-sectional view taken at A-A' shown in Figure 6 isFigure 5 An enlarged view of the area P shown

[0087] In a first aspect, the present application provides a battery cell 100, which includes a housing 10, an electrode assembly 20, an electrode terminal 30, and a seal 40. The housing 10 includes a wall portion 11, and the wall portion 11 is provided with an electrode lead-out hole 111; the electrode assembly 20 is disposed inside the housing 10; at least a part of the electrode terminal 30 is located on the side of the wall portion 11 facing away from the electrode assembly 20. In the thickness direction X of the wall portion 11, the orthographic projection of the electrode terminal 30 covers the orthographic projection of the electrode lead-out hole 111; at least a part of the seal 40 surrounds the electrode lead-out hole 111 and is disposed between the wall portion 11 and the electrode terminal 30. Among them, the outer side of the wall portion 11 has a convex portion 112 protruding towards the electrode terminal 30. In the thickness direction X, a part of the seal 40 is clamped between the convex portion 112 and the electrode terminal 30.

[0088] The present application provides a battery cell 100, which includes a housing 10 for providing accommodation and support, an electrode assembly 20 for realizing electrical functions, an electrode terminal 30 for leading out the electrode assembly 20 to facilitate electrical connection with external components, and a seal 40 for providing a sealing function at the position where the electrode is led out.

[0089] Optionally, the housing 10 can be in the shape of a cylinder, a cuboid, a prism, etc., and an accommodation cavity is provided inside itself, and the electrode assembly 20 is disposed in the accommodation cavity. The electrode assembly 20 can be formed by winding or stacking multiple layers of electrode sheets, and is electrically connected to the electrode terminal 30 through structures such as electrode tabs and adapter sheets.

[0090] Optionally, the housing 10 includes a wall portion 11, and the wall portion 11 can be optionally one side surface of the housing 10 or a partial area of one side surface. The wall portion 11 is provided with an electrode lead-out hole 111, and the electrode lead-out hole 111 penetrates along the thickness direction of the wall portion 11, and its shape and size can match the shape and size of the electrode terminal 30.

[0091] Optionally, at least a part of the electrode terminal 30 is disposed outside the wall portion 11, that is, protruding from the housing 10, so as to facilitate electrical connection with external components. The electrode terminal 30 can be made of a conductive material such as metal, and can be in a structural form such as a cylinder or a cuboid. The electrode terminal 30 is electrically connected to the electrode assembly 20 through the aforementioned electrode lead-out hole 111. The electrode terminal 30 can be optionally partially inserted into the electrode lead-out hole 111, or the electrode terminal 30 can be optionally entirely disposed outside the housing 10.

[0092] In the battery cell 100, in the thickness direction X of the wall portion 11, the orthographic projection of the electrode terminal 30 covers the orthographic projection of the electrode lead-out hole 111. Specifically, the diameter of at least a partial section of the electrode terminal 30 is greater than the diameter of the electrode lead-out hole 111, and this section can be arranged adjacent to the wall portion 11, so that the electrode terminal 30 can press the seal 40 against the wall portion 11 through the side surface of this section intersecting with the thickness direction X. Optionally, this side surface can be the bottom surface of the electrode terminal 30.

[0093] The seal 40 is arranged to extend along the circumferential direction of the electrode lead-out hole 111 for sealing the electrode lead-out hole 111 and reducing the possibility of external dust and other impurities entering the interior of the housing 10 from the electrode lead-out hole 111. The seal 40 can optionally be a sealing washer made of a material with certain elasticity, such as rubber, etc.

[0094] Optionally, the seal 40 is at least partially clamped between the wall portion 11 and the electrode terminal 30. The wall portion 11 is provided with a convex portion 112 protruding towards the direction where the electrode terminal 30 is located, and the seal 40 is pressed against the convex portion 112, that is, in the thickness direction X, the acting force transmitted by the seal 40 to the wall portion 11 is applied to the convex portion 112.

[0095] Optionally, the convex portion 112 can be an annular structure extending completely along the circumferential direction of the electrode lead-out hole 111, or the convex portion 112 can include multiple sub-structures spaced apart in this circumferential direction. The width of the convex portion 112 can be the same as or close to the width of the area where the seal 40 abuts against the wall portion 11.

[0096] Optionally, the cross-section of the convex portion 112 can be selected as structural forms such as a trapezoid, a semi-ellipse, a semi-circle, etc. By applying the acting force to the protruding convex portion 112, the acting force in the thickness direction X can be dispersed through the protruding arched structure, reducing the possibility of the seal 40 expanding and the wall portion 11 moving away from the electrode terminal 30 after being pressed, and at the same time improving the structural strength at the position where the convex portion 112 is provided.

[0097] Optionally, in an embodiment where multiple electrode terminals 30 need to be provided in the battery cell 100, multiple wall portions 11 and multiple seals 40 can be correspondingly provided on the housing 10. The sealing structures at the positions where the multiple electrode terminals 30 are located can all be the same, and convex portions 112 are provided on each wall portion 11.

[0098] In some optional embodiments, the convex portion 112 surrounds the electrode lead-out hole 111.

[0099] Optionally, the convex portion 112 can be an annular structure extending completely along the circumferential direction of the electrode lead-out hole 111. According to the structural form of the seal 40, this annular structure can be optionally arranged at an interval or adjacent to the electrode lead-out hole 111.

[0100] Optionally, the extension dimensions of each convex portion 112 in the radial direction of the electrode lead hole 111 are the same.

[0101] Setting the convex portion 112 to extend completely along the ring shape can further improve the sealing reliability of the seal 40, reduce the possibility of external dust or moisture entering the interior of the housing 10, and thus improve the overall reliability of the battery cell 100.

[0102] In some alternative embodiments, at least a part of the surface of the convex portion 112 in contact with the seal 40 is an arc surface.

[0103] The surface of the convex portion 112 can be at least partially set as an arc surface. Exemplarily, the surface of the convex portion 112 facing the seal 40 can be optionally set as an arc; or, the top surface near the center can be set as a plane in its own width direction, while the two sides are set as arc surfaces; or, the middle region can be set as an arc surface in its own width direction, while the two sides are set as inclined planes.

[0104] Optionally, the arc surface here refers to a curved surface whose cross-sectional pattern formed in the cross-section perpendicular to the extending direction of the convex portion 112 extends along an arc or an elliptical arc.

[0105] Optionally, the cross-sectional pattern formed by the convex portion 112 in the cross-section perpendicular to its own extending direction can be an axisymmetric figure, and its axis of symmetry can be optionally extended along the axial direction of the electrode lead hole 111, that is, the thickness direction X.

[0106] Setting at least a part of the outer surface of the convex portion 112 facing the seal 40 as an arc surface can improve the structural strength of the convex portion 112, and can make the acting force be distributed more evenly along the curved surface, thereby reducing the acting force on the adjacent regions on both sides of the convex portion 112, and further reducing the possibility of deformation of the wall portion 11 under pressure.

[0107] In some alternative embodiments, the convex portion 112 forms a first cross-sectional pattern in the cross-section perpendicular to its own extending direction, and the edge on the side of the first cross-sectional pattern close to the electrode terminal 30 is arc-shaped.

[0108] Optionally, the surface of the convex portion 112 on the side close to the electrode terminal 30, that is, the surface in contact with the seal 40, can be integrally set as an arc surface, and the first cross-sectional pattern formed by it in the cross-section perpendicular to its own extending direction can be optionally a bow shape, wherein the surface of the convex portion 112 in contact with the seal 40 forms an arc-shaped edge line in this cross-section. Optionally, the central angle corresponding to the arc-shaped edge line can be 180°.

[0109] Optionally, the regions of the wall portion 11 on both sides of the convex portion 112 may be partially extended along a plane, and the aforementioned arc-shaped surface may be directly connected to the aforementioned plane. Alternatively, a connecting surface with a relatively short extension dimension may be provided between the arc-shaped curved surface where the convex portion 112 abuts against the seal 40 and the plane of the wall portion 11, and the connecting surface may be extended parallel to the thickness direction X.

[0110] Optionally, corresponding to the convex portion 112, the surface of the seal 40 facing the convex portion 112 may be a plane, and a local groove recessed in a direction away from the convex portion 112 may be correspondingly formed after being pressed when pressed against the convex portion 112. Depending on the hardness of the seal 40 and the magnitude of the pressing force between it and the convex portion 112, the seal 40 may have different degrees of deformation, such that the sealing interface formed between it and the convex portion 112 is a ring with different widths.

[0111] Setting the surface of the convex portion 112 in contact with the seal 40 as an arc surface can make the force more uniform and facilitate processing.

[0112] Please refer to Figure 7 , Figure 7 is Figure 6 an enlarged view of the region Q shown in the figure. In some alternative embodiments, a mating groove 41 is provided on the side of the seal 40 close to the convex portion 112, and the convex portion 112 extends into the mating groove 41. In the thickness direction X, the orthographic projection of the mating groove 41 covers the orthographic projection of the convex portion 112.

[0113] Optionally, the seal 40 may be provided with a mating groove 41 corresponding to the convex portion 112, and the mating groove 41 is used to accommodate the convex portion 112, so that the sealing interface where the two abut against each other is wider when the acting force in the thickness direction X is small, further improving the sealing performance.

[0114] Optionally, the opening of the mating groove 41 is provided on the surface of the seal 40 facing the convex portion 112 and is recessed along the thickness direction X. Its shape may match the convex portion of the convex portion 112, that is, the cross-sections of the two may have the same contour shape, so that the two can be mutually engaged and form a tightly abutted and relatively large sealing interface, thereby further improving the reliability of the seal.

[0115] Optionally, the extension dimension of the mating groove 41 in the circumferential direction of the electrode lead-out hole 111 may match the convex portion 112. Exemplarily, in an embodiment where the convex portion 112 extends completely in the circumferential direction and is arranged in a ring shape, the mating groove 41 also extends in a ring shape; in an embodiment where the convex portion 112 includes a plurality of sub-portions or bumps arranged at intervals in the circumferential direction, the mating groove 41 may also include a plurality of corresponding sub-grooves, and the surfaces between adjacent sub-grooves can be in contact with the surfaces between adjacent sub-portions on the wall portion 11, that is, the shapes of the regions where the seal 40 is in contact with the wall portion 11 match each other.

[0116] In some alternative embodiments, a recess 113 is provided on the inner side of the wall portion 11 facing the electrode assembly 20, and the recess 113 is recessed in a direction close to the electrode terminal 30; in the thickness direction X, the position of the recess 113 corresponds to the position of the convex portion 112.

[0117] Optionally, a recess 113 may be correspondingly provided on the back side of the convex portion 112 in the wall portion 11, so that the convex portion 112 and the recess 113 are correspondingly arranged in the thickness direction X, and it is optional that the positive projection of the convex portion 112 in this direction covers the positive projection of the recess 113 in this direction.

[0118] Optionally, the recess 113 may have the same or similar cross-sectional shape as the convex portion 112.

[0119] Correspondingly arranging a recess 113 on the side of the wall portion 11 facing away from the convex portion 112 can make the overall thickness of the wall portion 11 more uniform, and it can be conveniently processed by sheet metal processes such as stamping or bending, thereby improving the processing efficiency and reducing the processing cost.

[0120] In some alternative embodiments, in the thickness direction X, the extension dimension of the convex portion 112 is L1, and in the radial direction of the electrode lead-out hole 111, the extension dimension of the convex portion 112 is L2; 0.05 ≤ L1 / L2 ≤ 1 / 1.5.

[0121] Optionally, the convex portion 112 is an arched structure protruding in the direction of the electrode terminal 30. Denote the extension dimension of the convex portion 112 in the thickness direction X, that is, the arch height, as L1, and denote the extension dimension of the convex portion 112 in the radial direction of the electrode lead-out hole 111, that is, the arch width, as L2. Then the ratio of L1 to L2 can be between 0.05 and 1 / 1.5. For example, it can be any one of 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 1 / 1.5 or any value between any two of them.

[0122] Making the width and thickness of the convex portion 112 have a suitable dimensional ratio can enable the convex portion 112 to have good load-bearing capacity while occupying a small installation space.

[0123] In some optional embodiments, in the thickness direction X, the extension dimension of the protrusion 112 is L1, and 0.3 mm≤L1≤3 mm.

[0124] Optionally, in the thickness direction X, the protrusion 112 may have a certain extension dimension, and the extension dimension L1 of the protruding structure in the aforementioned direction may be 0.3mm-3mm, for example, it may be any one of 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm and 3mm or between any two of them.

[0125] By limiting the thickness of the protrusion 112 , the protrusion 112 can have an appropriate thickness, thereby effectively improving the structural strength and stability of the wall portion 11 without interfering with other components such as the electrode terminal 30 .

[0126] In some optional embodiments, the wall portion 11 includes a connection area 114 provided with a protrusion 112 and a main body area 115 staggered from the protrusion 112, the thickness of the connection area 114 is L3, and the thickness of the main body area 115 is L4; 0.6≤L3 / L4≤1.5.

[0127] The wall portion 11 includes a connecting area 114 where the protrusion 112 is set and a main body area 115 staggered from the protrusion 112. Specifically, in the thickness direction X, the orthographic projection of the protrusion 112 is located within the orthographic projection of the connecting area 114, and the orthographic projection contours of the two can be selected to overlap with each other, and the orthographic projection of the protrusion 112 and the orthographic projection of the main body area 115 are staggered from each other, and the main body area 115 and the connecting area 114 can be selected to be connected.

[0128] Optionally, the extension dimension of the connection area 114 in the thickness direction X includes the sum of the thicknesses of the main part of the wall 11 and the protrusion 112. In the embodiment arranged in the recess 113, the aforementioned extension dimension refers to the distance between the side wall of the recess 113 close to the electrode terminal 30 and the top of the protrusion 112.

[0129] Optionally, the thickness of the connecting area 114 is recorded as L3, and the thickness of the main area 115 is recorded as L4, and the ratio of L3 to L4 is between 0.6-1.5, for example, it can be any one of 0.6, 0.8, 1, 1.2, 1.4, 1.5 or between any two.

[0130] By adjusting the thickness ratio between the position where the convex portion 112 is provided and the position where the convex portion 112 is not provided in the wall portion 11 , the thickness of the wall portion 11 can be made more uniform, thereby making the wall portion 11 as a whole have good structural strength.

[0131] In some alternative embodiments, in the radial direction of the electrode lead-out hole 111, the width of the convex portion 112 is L2, and the width of the region where the seal 40 abuts against the wall portion 11 is L5; 0.7 ≤ L2 / L5 ≤ 1.3.

[0132] Optionally, in the radial direction of the electrode lead-out hole 111, the extension dimension of the convex portion 112 is denoted as L2. At the same time, the seal 40 abuts against the wall portion 11 at the position where the convex portion 112 is located, forming an annular abutting region, and the width of this abutting region is denoted as L5. Then the ratio of L2 to L5 can be 0.7 - 1.3, for example, it can be any one of 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3 or between any two of them.

[0133] By making the width of the convex portion 112 close to the width of the abutting region, the force exerted by the seal 40 on the wall portion 11 can be concentrated on the convex portion 112, and then effectively dispersed to both sides, thereby reducing the possibility of the wall portion 11 tilting or deforming.

[0134] In some alternative embodiments, a positioning portion 116 is further protrudingly provided on the surface of the wall portion 11 facing the electrode terminal 30. The seal 40 is provided with a positioning groove 42, and the positioning portion 116 extends into the positioning groove 42. The positioning portion 116 is provided between the electrode lead-out hole 111 and the convex portion 112.

[0135] Optionally, a positioning portion 116 can also be protrudingly provided on the wall portion 11 between the electrode lead-out hole 111 and the convex portion 112. The positioning portion 116 can be protrudingly provided by the main structure of the wall portion 11 in the same direction as the convex portion 112. The seal 40 is correspondingly provided with a positioning groove 42, and the positioning portion 116 extends into the positioning groove 42, which can make the relative position between the wall portion 11 and the seal 40 stable in the radial direction of the electrode lead-out hole 111.

[0136] Optionally, both the positioning portion 116 and the positioning groove 42 can extend completely along the circumferential direction of the electrode lead-out hole 111 and are arranged in an annular shape to further make the relative position between the wall portion 11 and the seal 40 stable.

[0137] Optionally, in the radial direction of the electrode lead-out hole 111, the extension dimension of the positioning groove 42 can be slightly larger than the extension dimension of the positioning portion 116 to facilitate the alignment and installation of the two.

[0138] Optionally, the positioning portion 116 can be arranged at one side end of the wall portion 11 close to the electrode lead-out hole 111, that is, the positioning portion 116 can extend along the aforementioned circumferential direction and enclose the electrode lead-out hole 111. Exemplarily, the positioning portion 116 can be made by bending a portion of the end area of ​​the wall portion 11 located on the circumferential side of the electrode lead-out hole 111 toward a direction close to the electrode terminal 30; or, a portion of the wall portion 11 may also exist between the positioning portion 116 and the edge of the electrode lead-out hole 111, and the positioning portion 116 can be optionally integrally arranged with or welded to the portion of the wall portion 11 extending along the plane.

[0139] Optionally, in the radial direction of the electrode lead-out hole 111 , the positioning portion 116 and the protrusion 112 may be spaced apart, and the sealing member 40 may be partially filled in the space, so as to further enable the sealing member 40 to have good sealing performance.

[0140] In some optional embodiments, in the thickness direction X, the extension dimension of the positioning portion 116 is greater than the extension dimension of the protrusion 112 .

[0141] Optionally, the positioning portion 116 may have a certain extension dimension in the thickness direction X, so as to bear the radial force, thereby making the relative position between the wall portion 11 and the seal 40 more stable. At the same time, the extension dimension of the convex portion 112 in this direction may be smaller than the extension dimension of the positioning portion 116, so that the convex portion 112 has a smaller protruding dimension, so as to disperse the force and reduce the possibility of tilting the wall portion 11 due to the concentration of compressive stress.

[0142] Optionally, in the embodiment where the matching groove 41 is provided, the depth of the matching groove 41 may be less than the depth of the positioning groove 42. Moreover, in the thickness direction X, there may be a certain gap between the end of the positioning portion 116 extending into the positioning groove 42 and the bottom of the positioning groove 42, or the sizes of the two may be adjusted so that the two fit and abut against each other but do not transmit the corresponding force in the thickness direction X. In this way, the position where the seal 40 and the wall portion 11 are pressed and sealed can be located at the position where the convex portion 112 is located, so as to disperse the force.

[0143] In some optional embodiments, the electrode terminal 30 is located on a side of the wall portion 11 facing away from the electrode assembly 20 .

[0144] Alternatively, the electrode terminal 30 may be located entirely outside the wall portion 11 and connected to the wall portion 11 through other connectors. Protruding the electrode terminal 30 can reduce the possibility of short-circuiting the electrode terminal 30 with other components inside the housing 10, and at the same time, facilitate electrical connection of the electrode terminal 30 with other components outside the battery cell 100.

[0145] Optionally, the electrode terminal 30 may be in the form of a circular, rectangular, or polygonal thin sheet or plate structure, and is connected to the wall portion 11 through an insulating structure such as plastic. At the same time, on one surface close to the electrode assembly 20, it is electrically connected to the adapter piece, and through the adapter piece, it is electrically connected to the tab in the electrode assembly 20.

[0146] In some alternative embodiments, the battery cell 100 further includes an insulating member 50 and a fixing member 60. The insulating member 50 at least partially surrounds the electrode terminal 30 and is connected to the electrode terminal 30, and the fixing member 60 is connected between the wall portion 11 and the insulating member 50.

[0147] Optionally, the insulating member 50 is a plastic part, and the insulating member 50 can be integrally injection-molded onto the outer peripheral surface of the electrode terminal 30. The insulating member 50 can be a rigid plastic part. Exemplarily, the insulating member 50 can be made of a high-temperature resistant insulating plastic material by an integrally injection-molded method, for example, it can be made of one or more of polyphenylene sulfide, perfluoroalkoxy resin, or polypropylene.

[0148] Optionally, the insulating member 50 has a rotary body structure. The insulating member 50 has a receiving space adapted to the shape of the electrode terminal 30, so that the electrode terminal 30 can be received in the receiving space and fixed in contact with the electrode terminal 30. At this time, a part of the insulating member 50 may be sandwiched between the electrode terminal 30 and the housing 10.

[0149] Optionally, in order to make the connection between the electrode terminal 30 and the insulating member 50 more stable, a protruding portion and a recessed portion are correspondingly provided between the electrode terminal 30 and the insulating member 50, and the electrode terminal 30 and the insulating member 50 are fixed through the snap-fit of the convex portion and the concave portion. Exemplarily, the electrode terminal 30 may be provided with an annular protruding portion, and the insulating member 50 is provided with a recessed portion corresponding to the protruding portion.

[0150] Optionally, the fixing member 60 surrounds the outer periphery of the electrode terminal 30 and engages with the insulating member 50, thereby fixing the electrode terminal 30 and the insulating member 50 to the housing 10. To improve the connection stability, the fixing member 60 can be made of a metal material.

[0151] Optionally, the fixing member 60 is a rotary body, and its two end portions in the radial direction of the electrode terminal 30 are respectively connected to the insulating member 50 and the housing 10.

[0152] By supporting and fixing the electrode terminal 30 through the insulating member 50 and the fixing member 60, the position of the electrode terminal 30 can be stabilized, and the overall structure of the battery cell 100 can be made stable and reliable.

[0153] In some optional embodiments, the insulating member 50 is disposed around the electrode terminal 30 , and the insulating member 50 is provided with a connecting groove, which at least partially extends along the radial direction of the electrode lead-out hole 111 , and the fixing member 60 extends into the connecting groove.

[0154] In an embodiment in which an insulating member 50 and a connecting member are provided, the insulating member 50 may be ring-shaped and arranged around the electrode terminal 30. The insulating member 50 may be made of a material with a certain elasticity such as plastic and wrap the electrode terminal 30 therein to make the connection between the two more stable.

[0155] Similarly, the fixing member 60 can also be arranged in a ring shape, and the insulating member 50 can be provided with a connecting groove, which can be optionally arranged on the outer peripheral surface of the insulating member 50 and at least partially extend along the radial direction of the electrode terminal 30, so that the fixing member 60 extending therein can better provide supporting force in the thickness direction X, thereby further improving the reliability of the battery cell 100.

[0156] In some optional embodiments, the housing 10 includes a shell 12 and an end cover 13 , the shell 12 has an opening 121 , and the end cover 13 covers the opening 121 ; the wall portion 11 is disposed on the end cover 13 .

[0157] Optionally, the housing 10 may include a shell 12 and an end cover 13 that are detachably connected to each other, wherein the shell 12 can enclose a receiving cavity and provide the cavity with a certain depth. At the same time, the shell 12 has an opening 121 that is connected to the receiving cavity, and the opening 121 can be optionally arranged to cover a side surface of the shell 12, and the end cover 13 covers the opening 121 and can close the opening 121.

[0158] Optionally, the wall portion 11 is arranged on the end cover 13, that is, the electrode terminal 30 and related components are all arranged on the end cover 13. After the electrode assembly 20 is arranged in the aforementioned accommodating cavity, it can be electrically connected to the electrode terminal 30 through a structure such as a transition piece, and the electrode terminal 30 can be detachably arranged on the end cover 13.

[0159] Optionally, the battery cell 100 further includes a pressure relief mechanism, which may be disposed on the end cover 13 and staggered with the electrode terminal 30 and the wall portion 11 .

[0160] Providing the electrode terminal 30 and the wall portion 11 on the end cover 13 can facilitate processing and replacement, and can be more conveniently connected to the electrode assembly 20 .

[0161] In a second aspect, the present application provides a battery 200 , comprising the battery cell 100 in any embodiment of the first aspect.

[0162] In a third aspect, the present application provides an electrical device, including the battery 200 in any of the embodiments of the second aspect, and the battery 200 is used to provide electrical energy.

[0163] The battery 200 and the electrical device in the embodiments of the present application have all the beneficial effects of the battery cell 100 in the first aspect. For specific descriptions of the battery cell 100, reference may be made to the above embodiments, and details thereof will not be repeated herein.

[0164] An embodiment of the present application provides a battery cell 100, including a housing 10, an electrode assembly 20, an electrode terminal 30, and a seal 40. The housing 10 includes a wall portion 11, and the wall portion 11 is provided with an electrode lead-out hole 111; the electrode assembly 20 is disposed inside the housing 10; at least a part of the electrode terminal 30 is located outside the wall portion 11 and covers the electrode lead-out hole 111; at least a part of the seal 40 surrounds the electrode lead-out hole 111 and is disposed between the wall portion 11 and the electrode terminal 30. Wherein, the outside of the wall portion 11 has a convex portion 112 protruding towards the electrode terminal 30, and in the thickness direction X of the wall portion 11, a part of the seal 40 is clamped between the convex portion 112 and the electrode terminal 30. The convex portion 112 surrounds the electrode lead-out hole 111, and the surface of the convex portion 112 in contact with the seal 40 is an arc surface. A mating groove 41 is provided on a side of the seal 40 close to the convex portion 112, and the convex portion 112 extends into the mating groove 41.

[0165] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; An electrode assembly is disposed in the housing; an electrode terminal, at least a portion of which is located on a side of the wall portion away from the electrode assembly, and an orthographic projection of the electrode terminal covers an orthographic projection of the electrode lead-out hole in a thickness direction of the wall portion; a sealing member, at least a portion of which surrounds the electrode lead-out hole and is disposed between the wall portion and the electrode terminal, The outer side of the wall portion has a convex portion protruding toward the electrode terminal, and a portion of the sealing member is sandwiched between the convex portion and the electrode terminal in the thickness direction.

2. The battery cell according to claim 1, wherein The protrusion surrounds the electrode lead-out hole.

3. The battery cell according to claim 1, wherein, At least a portion of the surface of the convex portion abutting against the sealing member is an arc-shaped surface.

4. The battery cell according to claim 3, characterized in that, The convex portion forms a first cross-sectional shape in a cross section perpendicular to the extension direction of the convex portion, and the first cross-sectional shape is in an arc shape at an edge of one side close to the electrode terminal.

5. The battery cell according to claim 1, wherein A matching groove is provided on one side of the sealing member close to the convex portion, the convex portion extends into the matching groove, and in the thickness direction, the orthographic projection of the matching groove covers the orthographic projection of the convex portion.

6. The battery cell according to claim 1, characterized in that, The wall portion is provided with a recessed portion on the inner side facing the electrode assembly, and the recessed portion is recessed in a direction close to the electrode terminal; In the thickness direction, the position of the concave portion corresponds to the position of the convex portion.

7. The battery cell according to claim 1, characterized in that, In the thickness direction, the extension dimension of the convex portion is L1, and in the radial direction of the electrode lead-out hole, the extension dimension of the convex portion is L2; 0.05≤L1 / L2≤1 / 1.

5.

8. The battery cell according to claim 1, characterized in that In the thickness direction, the extension dimension of the protrusion is L1, 0.3 mm≤L1≤3 mm.

9. The battery cell according to claim 1, characterized in that, The wall portion includes a connection area provided with the convex portion and a main body area staggered with the convex portion, the thickness of the connection area is L3, and the thickness of the main body area is L4; 0.6≤L3 / L4≤1.

5.

10. The battery cell according to claim 1, wherein, In the radial direction of the electrode lead-out hole, the width of the convex portion is L2, and the width of the area where the sealing member abuts against the wall portion is L5; 0.7≤L2 / L5≤1.

3.

11. The battery cell according to claim 1, characterized in that, A positioning portion is also protruded from a surface of one side of the wall portion facing the electrode terminal, and a positioning groove is provided on the sealing member. The positioning portion extends into the positioning groove, and the positioning portion is arranged between the electrode lead-out hole and the protrusion.

12. The battery cell according to claim 11, wherein In the thickness direction, an extension dimension of the positioning portion is greater than an extension dimension of the convex portion.

13. The battery cell according to claim 1, characterized in that, The electrode terminal is located at a side of the wall portion away from the electrode assembly.

14. The battery cell according to claim 1, wherein, The battery cell further includes an insulating member and a fixing member, the insulating member at least partially surrounding the electrode terminal and connected to the electrode terminal, and the fixing member connected between the wall portion and the insulating member.

15. The battery cell according to claim 14, wherein The insulating member is disposed around the electrode terminal, and is provided with a connecting groove, the connecting groove at least partially extending along the radial direction of the electrode lead-out hole, and the fixing member extends into the connecting groove.

16. The battery cell according to claim 1, wherein, The housing comprises a shell and an end cover, the shell has an opening, and the end cover covers the opening; The wall portion is arranged on the end cover.

17. A battery, characterized in that, Comprising at least one battery cell as described in any one of claims 1-16.

18. An electrical device, characterized in that, Comprising a battery as described in claim 17, the battery being used for providing electrical energy.

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