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 and an end cover, and the shell is provided with an opening; the electrode assembly is contained in the shell, the end cover is connected to the shell and covers the opening, the end cover is provided with a first limiting structure, the shell is provided with a second limiting structure, and the first limiting structure is matched with the second limiting structure so as to limit the rotation amplitude of the end cover relative to the shell in the circumferential direction of the opening. According to the battery monomer provided by the embodiment of the invention, the assembly precision and reliability can be improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are increasingly widely used, such as in mobile phones, laptops, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools.

[0003] The development of battery technologies needs to consider various design factors simultaneously. For example, how to improve the installation accuracy and reliability of batteries is an important research direction in the field of batteries. Summary of the Utility Model

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

[0005] In a first aspect, the present application provides a battery cell, including a housing, an electrode assembly, and an end cap. The housing has an opening; the electrode assembly is accommodated in the housing, and the end cap is connected to the housing and covers the opening. Among them, the end cap is provided with a first limiting structure, and the housing is provided with a second limiting structure. The first limiting structure cooperates with the second limiting structure to limit the rotation amplitude of the end cap relative to the housing along the circumferential direction of the opening.

[0006] In the technical solution of the embodiment of the present application, the battery cell includes a housing, an electrode assembly disposed in the housing, and an end cap for covering the opening of the housing. Among them, the housing and the end cap can cooperate with each other through the first limiting structure and the second limiting structure, so that the relative displacement amplitude between the two in the circumferential direction of the opening is reduced, or directly the relative positions of the two in the circumferential direction are fixed. Thereby, the possibility of inability to assemble due to the circumferential deflection angle between the housing and the end cap during assembly can be reduced, and at the same time, the relative position between the end cap and the housing can be made more stable after assembly, thereby improving the reliability of the battery cell.

[0007] According to some embodiments in the embodiments of the present application, the second limiting structure is disposed on one side of the housing along the axial direction of the opening, and the first limiting structure is disposed on the side of the end cap facing the housing along the axial direction; the first limiting structure and the second limiting structure are opposite to each other along the axial direction and form a concave-convex fit. Enabling the first limiting structure and the second limiting structure to cooperate with each other along the axial direction can save the space for arranging the limiting structure and reduce the possibility of interference with other components in the housing.

[0008] In some embodiments according to the embodiments of the present application, openings are provided at both ends of the housing, there are two end caps, and both end caps are provided with first limiting structures. By respectively providing limiting structures on the end caps on both sides, the deflection angle between the two end caps can be further limited within a certain range by respectively cooperating with both ends of the housing, thereby further improving the alignment accuracy.

[0009] In some embodiments according to the embodiments of the present application, the end cap is provided with a plurality of first limiting structures, and the plurality of first limiting structures are arranged at intervals along the circumference of the opening; one end of the housing facing the end cap is provided with a plurality of second limiting structures, and the plurality of second limiting structures are arranged in one-to-one correspondence with the plurality of first limiting structures. By providing multiple groups of first and second limiting structures, the relative position stability of the end cap and the housing in the circumferential direction can be further improved.

[0010] In some embodiments according to the embodiments of the present application, the sizes of at least two first limiting structures along the circumference of the opening are different; alternatively, the sizes of at least two first limiting structures along the radial direction of the opening are different. By making the multiple limiting structures on the same end cap have different sizes or shapes, the possibility that the first limiting structure cooperates with another non-corresponding second limiting structure due to a specific angular deflection of the end cap can be reduced, and the alignment accuracy between the end cap and the housing can be further improved.

[0011] In some embodiments according to the embodiments of the present application, one of the first limiting structure and the second limiting structure includes a convex part, and the other includes a concave part. Setting the two limiting structures to be in concave-convex fit can make the structure simple, easy to process and stably cooperate with each other.

[0012] In some embodiments according to the embodiments of the present application, in the circumferential direction of the opening, the size of the concave part is larger than that of the convex part. By increasing the extension size of the concave part, a certain amount of fitting allowance can be provided between the convex part and the concave part, and the processing difficulty can be reduced on the basis of making the deflection range between the end cap and the housing smaller.

[0013] In some embodiments according to the embodiments of the present application, the concave part extends along the circumference of the opening, the included angle between the connection lines of both ends of the concave part along the circumference and the central axis of the opening is α, the included angle between the connection lines of both ends of the convex part along the circumference and the central axis of the opening is β, and α - β is 1° - 20°. By adjusting the extension sizes of both the concave part and the convex part in the circumferential direction, the specific relative rotation angle between the end cap and the housing can be limited, so that the maximum rotation angle is less than or equal to 20°, and the end cap and the housing can be accurately aligned.

[0014] In some embodiments according to the embodiments of the present application, in the cross-section parallel to the axial direction of the opening, the cross-sectional shape formed by the convex part is at least one of a semicircle, a trapezoid, a triangle and a rectangle. The shape of the convex part can be selected from one of a variety of shapes that are easy to process to improve the processing efficiency of the battery cell.

[0015] In some embodiments according to the embodiments of the present application, the convex portion includes a plurality of sub-portions arranged in contact with each other, and the sub-portions protrude axially respectively; the plurality of sub-portions are arranged along the circumference of the opening, or the plurality of sub-portions are arranged along the radius of the opening, or the plurality of sub-portions are arranged in an array. In addition to the structure in which the convex portion protrudes integrally, the convex portion can also be composed of a plurality of sub-portions, thereby improving the stability and reliability after the mutual engagement between the convex portion and the concave portion.

[0016] In some embodiments according to the embodiments of the present application, the housing includes a main body portion and a reinforcing portion. The main body portion surrounds the electrode assembly. The reinforcing portion is connected to the main body portion and is located at the end of the housing close to the opening. In the radial direction of the opening, the thickness of the reinforcing portion is greater than the thickness of the main body portion; the reinforcing portion includes a second limiting structure. The position where the second limiting structure is provided in the housing can be thickened correspondingly, so that the second limiting structure has a larger installation space, thereby improving the reliability of circumferential limiting.

[0017] In some embodiments according to the embodiments of the present application, the reinforcing portion is annular and defines an opening. Setting the reinforcing portion as an annular structure extending integrally along the circumference can make the setting of the second limiting structure more flexible, and at the same time can make the welding connection between the end cover and the housing more stable and reliable.

[0018] In some embodiments according to the embodiments of the present application, in the radial direction, the thickness of the reinforcing portion is L1, and the thickness of the main body portion is L2, 1.5L2 ≤ L1 ≤ 2.5L2; in the axial direction of the opening, the size of the reinforcing portion accounts for 5% - 10% of the size of the housing. By making the thickness of the reinforcing portion and its size in the axial direction within a suitable range, it is possible to reduce the space required for the reinforcing portion on the basis of facilitating the setting of the second limiting structure and reduce the possibility of interference with other components.

[0019] In some embodiments according to the embodiments of the present application, in the radial direction, the thickness of the reinforcing portion is L1, and the size of the second limiting structure is L3, 0.5L1 ≤ L3 ≤ L1. The second limiting structure can have a relatively large size in the radial direction to improve the stability of the limit and facilitate the cooperation between the first and second limiting structures.

[0020] In a second aspect, the present application provides a battery, including the battery cell in any one of the embodiments of the first aspect.

[0021] In a third aspect, the present application provides an electrical device, including the battery in any one of the embodiments of the second aspect, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 for the purpose of illustrating the preferred embodiments only and are not to be considered as limiting the present application. Also, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0023] Figure 1 A simplified schematic diagram of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 An exploded view of a battery provided in some embodiments of the present application;

[0025] Figure 3 An exploded view of a battery module provided in some embodiments of the present application;

[0026] Figure 4 Is Figure 3 A cross-sectional view taken along the line A-A' shown;

[0027] Figure 5 Is Figure 4 An enlarged view of the area P shown;

[0028] Figure 6 Is Figure 4 Another enlarged view of the area P shown;

[0029] Figure 7 Is Figure 3 A cross-sectional view taken along the line B-B' shown;

[0030] Figure 8 Is Figure 4 Another enlarged view of the area P shown.

[0031] Reference numerals:

[0032] 1000 - Vehicle;

[0033] 100 - Battery cell; 200 - Battery; 300 - Controller; 400 - Motor;

[0034] 10 - Housing; 20 - Electrode assembly; 30 - End cap; 40 - Box body; 50 - Battery module;

[0035] 11 - Opening; 12 - Second limiting structure; 13 - Recess; 14 - Main body part; 15 - Reinforcing part; 31 - First limiting structure; 32 - Convex part; 41 - First box body part; 42 - Second box body part; 43 - Accommodating part;

[0036] 321 - Sub - part. Detailed implementation manners

[0037] 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.

[0038] 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 "comprising" and "having" and any variations thereof in the description of the specification, claims and above drawings of this application are intended to cover non-exclusive inclusion.

[0039] 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.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0041] 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 three relationships can exist. 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.

[0042] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0043] 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.

[0044] In the description of the embodiments of the present application, unless otherwise clearly defined and limited, technical terms such as "installation", "connection", "connection", "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.

[0045] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can activate the active material and continue to be used by charging after discharging.

[0046] 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.

[0047] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charging and discharging 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.

[0048] In some embodiments, the electrode assembly further includes a separator, which is disposed between the positive electrode and the negative electrode, can prevent the short circuit between the positive and negative electrodes, and at the same time allows active ions to pass through.

[0049] 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.

[0050] 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.

[0051] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0057] 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.

[0058] In some embodiments, the electrode assembly is a stacked structure.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] As an example, a plurality of separators can be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0063] 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.

[0064] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, or the like.

[0065] In some embodiments, the electrode assembly is provided with tabs. The tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] 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.

[0067] 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 prism battery, etc.

[0068] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0069] 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.

[0070] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0071] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0072] 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.

[0073] The battery cell generally includes housings of various different shapes, such as: cuboid, cylindrical, etc., and the housing of the battery cell is usually formed by the mutual snap-fitting of a shell and an end cover. In a battery cell with a symmetric shape such as a cuboid for the housing, and in a battery cell with a rotational body shape such as a cylinder for the housing, there is a possibility that the end cover deviates from the preset position during assembly, for example, there is a certain angular misalignment in the circumferential direction of the opening of the shell, etc., resulting in the end cover and the shell not being able to snap-fit tightly with each other.

[0074] However, in the existing process, it is not possible to well detect and solve the problem of the angular deviation between the end cover and the preset installation position.

[0075] In view of this, an embodiment of the present application provides a technical solution, which defines the relative positions of the end cover and the housing in the circumferential direction by respectively arranging limiting structures on the end cover and the housing, so that the two are accurately aligned and can be smoothly installed.

[0076] Optionally, in the following embodiments of the present application, a cylindrical battery is taken as an example of the battery cell for illustration. However, it should be understood that the present application is not limited thereto, and it can also be applied to other battery cells in which there is a possibility of deviation from the preset installation position after the end cover and the housing are buckled, and corresponding protection is provided.

[0077] 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 spacecrafts are, for example, airplanes, rockets, space shuttles, and spaceships, 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.

[0078] The battery cells described in the embodiments of the present application are not only limited to the electrical devices described above. However, for the sake of simplicity of description, the following embodiments are all described by taking an electric vehicle as an example.

[0079] Please refer to Figure 1 , Figure 1 which is a schematic diagram of a vehicle 1000 provided for 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 electric vehicle, or an extended-range electric 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 power supply of the vehicle 1000. For example, the battery 200 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 300 and a motor 400. The controller 300 is used to control the power supply of the battery to the motor 400, for example. The battery can be used for starting, 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.

[0080] Figure 2 which is an exploded view of a battery 200 provided for some embodiments of the present application. As Figure 2 shown, the battery 200 includes a box body and a battery cell 100, and the battery cell 100 is accommodated in the box body.

[0081] The box body 40 is used to accommodate the battery cells 100, and the box body 40 can have various structures. In some embodiments, the box body 40 may include a first box body part 41 and a second box body part 42. The first box body part 41 and the second box body part 42 cover each other, and the first box body part 41 and the second box body part 42 jointly define a receiving part 43 for accommodating the battery cells 100. The second box body part 42 can be a hollow structure with an opening 11 at one end, and the first box body part 41 is a plate-like structure. The first box body part 41 covers the opening 11 side of the second box body part 42 to form the box body 40 with the receiving part 43; both the first box body part 41 and the second box body part 42 can also be hollow structures with an opening 11 on one side, and the opening 11 side of the first box body part 41 covers the opening 11 side of the second box body part 42 to form the box body 40 with the receiving part 43. Of course, the first box body part 41 and the second box body part 42 can have various shapes, such as a cylinder, a cuboid, etc.

[0082] Figure 3 The following is an exploded view of the battery module 50 provided in some embodiments of the present application, as Figure 3 shown. In the battery 200, the battery cells 100 can be one or multiple. 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 40; 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 50, and then the multiple battery modules 50 are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 40.

[0083] In some embodiments, there are multiple battery cells 100. The multiple battery cells 100 are first connected in series, in parallel, or in a mixed connection to form battery modules 50. The multiple battery modules 50 are then connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 40.

[0084] Next, the structure of the battery cell 100 will be described in conjunction with the attached Figure 4 to the attached Figure 8 drawings.

[0085] Please also refer to Figures 4 to 6 , Figure 4 which is Figure 3 a cross-sectional view taken at A - A' shown in Figure 5 and Figure 4 is an enlarged view of the area P shown in Figure 6 and Figure 4 is another enlarged view of the area P shown in

[0086] In a first aspect, the present application provides a battery cell 100, which includes a housing 10, an electrode assembly 20, and an end cap 30. The housing 10 has an opening 11; the electrode assembly 20 is accommodated in the housing 10, and the end cap 30 is connected to the housing 10 and covers the opening 11. Among them, the end cap 30 is provided with a first limiting structure 31, and the housing 10 is provided with a second limiting structure 12. The first limiting structure 31 cooperates with the second limiting structure 12 to limit the rotation amplitude of the end cap 30 relative to the housing 10 along the circumferential direction of the opening 11.

[0087] The battery cell 100 includes a housing 10 and an end cap 30 for forming an accommodation cavity and providing external protection, and also includes an electrode assembly 20 disposed in the accommodation cavity formed by enclosing the housing 10 and the end cap 30. Optionally, electrode terminals, a pressure relief mechanism, and other structures for assisting in realizing the functions of the battery cell 100 may also be provided on the housing 10 and the end cap 30.

[0088] Optionally, the housing 10 and the end cap 30 in the battery cell 100 may be made of a metal material or a plastic material, such as copper, iron, steel, aluminum, and their alloys.

[0089] Optionally, the housing 10 has an opening 11, and the end cap 30 is used to cover the opening 11. The housing 10 cooperates with the end cap 30 to jointly form an accommodation cavity, which can be used to accommodate the electrode assembly 20, electrolyte, and other components. The end cap 30 can be connected to the housing 10 by welding, bonding, clamping, or other means. The housing 10 may be optionally provided with a single-sided opening 11 and connected to one end cap 30, or the housing 10 may be optionally provided with double-sided openings 11 and the two end caps 30 are respectively connected to the openings 11.

[0090] The electrode assembly 20 includes a positive electrode plate and a negative electrode plate. Optionally, the electrode assembly 20 generates electric energy through oxidation and reduction reactions when ions are inserted / extracted in the positive electrode plate and the negative electrode plate. Optionally, the electrode assembly 20 further includes a separator, and the separator is used to insulate and isolate the positive electrode plate and the negative electrode plate. The electrode assembly 20 may be one or multiple. When there are multiple electrode assemblies 20, the multiple electrode assemblies 20 may be stacked.

[0091] Optionally, the battery cell 100 may further include electrode terminals, which can be used to electrically connect to the electrode assembly 20 for outputting the electric energy of the battery cell 100 or inputting electric energy into the battery cell 100. The electrode terminals may be disposed on the end cap 30. Exemplarily, the battery cell 100 may include two electrode terminals, and the two electrode terminals are respectively electrically connected to the tabs on the positive electrode plate and the tabs on the negative electrode plate. Optionally, the electrode terminals may also be indirectly electrically connected to the corresponding electrode plates through current collecting components.

[0092] Optionally, the battery cell 100 may further include a pressure relief mechanism. The pressure relief mechanism and the housing may be optionally independent molded components, and the two may be connected by welding, bonding or other means. For example, a pressure relief hole is provided on the housing, the pressure relief hole penetrates the housing, the pressure relief mechanism is installed on the housing and covers the pressure relief hole to separate the spaces on both sides of the housing inside and outside. Alternatively, the pressure relief mechanism and the housing may also be an integrally molded structure.

[0093] A weak part may be provided in the pressure relief mechanism. The strength of the weak part is less than the strength of other areas of the housing, making the weak part an easily breakable, crushable, tearable or openable part in the pressure relief mechanism.

[0094] The end cap 30 is provided with a first limiting structure 31, and the housing 10 is provided with a second limiting structure 12. The two limiting structures cooperate with each other to form a circumferential relative position limit of the opening 11. Optionally, the first limiting structure 31 and the second limiting structure 12 may be respectively provided on the surfaces of the end cap 30 and the housing 10 facing each other, and interfere with each other axially or radially of the opening 11 to form a circumferential relative position lock.

[0095] Exemplarily, the first limiting structure 31 and the second limiting structure 12 may be set as concave-convex structures protruding / depressed axially of the opening 11, and the concave-convex structures cooperate with each other to prevent relative rotation between the end cap 30 and the housing 10. Alternatively, at least a part of the first limiting structure 31 provided on the end cap 30 may be inserted into the opening 11, and the inserted part of the structure cooperates with the second limiting structure 12 provided on the inner wall of the housing 10, that is, cooperates with the structure provided on the inner wall and concave-convex radially along the opening 11.

[0096] Optionally, the first limiting structure 31 and the second limiting structure 12 may have matching shapes and sizes so that the end cap 30 and the housing 10 can be locked with each other circumferentially of the opening 11; or, one of the first limiting structure 31 and the second limiting structure 12 can be limitedly moved relative to the other circumferentially to provide a certain assembly allowance on the basis of reducing the deflection angle between the end cap 30 and the housing 10.

[0097] Optionally, after positioning and assembling the end cap 30 and the housing 10 through the first limiting structure 31 and the second limiting structure 12, the connection between the two can be welded, optionally by laser welding or other means, and a welding layer is formed between the end cap 30 and the housing 10.

[0098] In the technical solution of the embodiment of the present application, the battery cell 100 includes a housing 10, an electrode assembly 20 disposed in the housing 10, and an end cap 30 for covering the opening 11 of the housing 10. The housing 10 and the end cap 30 can cooperate with each other through the first limiting structure 31 and the second limiting structure 12, so that the relative displacement amplitude between the two in the circumferential direction of the opening 11 is reduced, or the relative positions of the two in the circumferential direction are directly fixed. Thereby, the possibility of unable to assemble due to the circumferential deflection angle between the housing 10 and the end cap 30 during assembly can be reduced, and the possibility of the connecting piece being pressed and bent due to the inability to align with each other during assembly can be reduced. At the same time, the relative position between the end cap 30 and the housing 10 can be made more stable after assembly, thereby improving the reliability of the battery cell 100.

[0099] In some alternative embodiments, the second limiting structure 12 is disposed on one side of the housing 10 along the axial direction of the opening 11, and the first limiting structure 31 is disposed on the side of the end cap 30 facing the housing 10 along the axial direction; the first limiting structure 31 and the second limiting structure 12 are opposite to each other along the axial direction and form a concave-convex fit.

[0100] Optionally, the abutting surface between the end cap 30 and the housing 10 can be selected to be perpendicular to the axial direction. At the same time, the first limiting structure 31 and the second limiting structure 12 can be set to protrude or recess along the axial direction of the opening 11, that is, the two can be respectively disposed on the sides of the end cap 30 and the housing 10 facing each other in the axial direction, and are joined to each other at the interface where the end cap 30 and the housing 10 are in contact with each other.

[0101] Optionally, the first limiting structure 31 and the second limiting structure 12 can be selected to have a concave-convex mating structure form in the axial direction. Thereby, the first limiting structure 31 and the second limiting structure 12 can be set through the original parts of the end cap 30 and the housing 10 that extend in the axial direction, thereby reducing the possibility of interfering with the installation of other components, and at the same time reducing the space required for setting the limiting structure, and further reducing the overall space required for the battery cell 100.

[0102] In some alternative embodiments, openings 11 are provided at both ends of the housing 10, and there are two end caps 30, and the first limiting structure 31 is provided on both end caps 30.

[0103] Optionally, two end caps 30 can be provided in the battery cell 100 at the same time. Correspondingly, the housing 10 can be provided with two openings 11 at the opposite ends respectively, and the central axes of the two openings 11 can coincide, so that the housing 10 has a cylindrical structure as a whole, making it easy to process and having a large volume inside, and at the same time enabling the battery cell 100 to have good heat dissipation performance.

[0104] In an embodiment where the housing 10 has two oppositely arranged openings 11 at the same time, two end caps 30 can be respectively closed at the two openings 11. Optionally, electrode terminals can be respectively arranged on the two end caps 30 to lead out the positive electrode and the negative electrode of the battery cell 100 from both sides respectively, which is convenient for electrically connecting with external electrical components or charging components.

[0105] Optionally, in an embodiment where the battery cell 100 includes two end caps 30, the two end caps 30 can be provided with first limiting structures 31, and each end cap 30 can be provided with one or more first limiting structures 31. At the same time, the housing 10 can be provided with a plurality of second limiting structures 12 corresponding to the respective first limiting structures 31.

[0106] Optionally, through the plurality of first limiting structures 31 respectively arranged on the two end caps 30, the two end caps 30 can be circumferentially limited with respect to the housing 10 respectively, and thus indirectly the deflection angle between the two end caps 30 is also within a suitable range to improve the alignment accuracy.

[0107] In some alternative embodiments, the end cap 30 is provided with a plurality of first limiting structures 31, and the plurality of first limiting structures 31 are arranged at intervals along the circumference of the opening 11; one end of the housing 10 facing the end cap 30 is provided with a plurality of second limiting structures 12, and the plurality of second limiting structures 12 are arranged in one-to-one correspondence with the plurality of first limiting structures 31.

[0108] One or more end caps 30 can be provided in the battery cell 100, and a plurality of first limiting structures 31 can be provided on each end cap 30. These first limiting structures 31 can be optionally arranged at intervals along the circumference of the opening 11, and further optionally arranged at equal intervals in the circumferential direction.

[0109] Optionally, a plurality of first limiting structures 31 can be simultaneously provided on the same end cap 30, and the housing 10 can be optionally provided with a plurality of second limiting structures 12 correspondingly. The plurality of first limiting structures 31 located on the same end cap 30 can be optionally arranged at intervals along the circumference, and further optionally arranged at equal intervals.

[0110] Optionally, the plurality of first limiting structures 31 located on the same end cap 30 can have the same shape and size, and at the same time, the correspondingly arranged second limiting structures 12 on the housing 10 can also have the same shape and size.

[0111] By providing multiple groups of first and second limiting structures 12, the acting force of circumferential limiting can be further increased, and thus the relative position stability between the end cap 30 and the housing 10 in the circumferential direction can be improved.

[0112] Please refer to Figure 7 , Figure 7 For Figure 3The cross-sectional view taken along B-B'. In some alternative embodiments, the circumferential dimensions of at least two first limiting structures 31 are different along the opening 11; or, the radial dimensions of at least two first limiting structures 31 are different.

[0113] In embodiments where multiple first limiting structures 31 are provided on the same end cover 30, these first limiting structures 31 can be selected to have different sizes or different shapes, that is, the shape and size of the first limiting structures 31 can be adjusted so that each first limiting structure 31 can cooperate with its corresponding second limiting structure 12, and cannot cooperate with other second limiting structures 12.

[0114] Specifically, taking the example where two first limiting structures 31 are provided on the same end cover 30 and two second limiting structures 12 are correspondingly provided on the housing 10, the correspondingly provided first and second limiting structures 12 are divided into a first group and a second group. On this basis, parameters such as size and shape should be adjusted so that the first limiting structure 31 in the first group cannot be concavo-convexly mated with the second limiting structure 12 in the second group, that is, the protruding one of the two cannot be pressed into the recessed one of the other. Similarly, the first limiting structure 31 in the second group cannot be mated with the first limiting structure 31 in the first group either.

[0115] By making the multiple limiting structures on the same end cover 30 have different sizes or shapes, the possibility that the first limiting structure 31 cooperates with another non-corresponding second limiting structure 12 due to a specific angular deflection of the end cover 30 can be reduced. For example, the possibility that the end cover 30 undergoes a 180° flip can be reduced, thereby further improving the alignment accuracy between the end cover 30 and the housing 10.

[0116] In some alternative embodiments, one of the first limiting structure 31 and the second limiting structure 12 includes a convex portion 32, and the other includes a concave portion 13.

[0117] The first limiting structure 31 and the second limiting structure 12 can be selected to achieve circumferential limiting in the form of concavo-convex mating. Specifically, one of the first limiting structure 31 and the second limiting structure 12 is a convex portion 32, and the other is a concave portion 13, where the convex portion 32 protrudes from one of the end cover 30 and the housing 10 towards the other, and the shape and size of the concave portion 13 correspond to those of the convex portion 32, so that the convex portion 32 can extend into the concave portion 13 and achieve concavo-convex mating positioning.

[0118] Optionally, the first limiting structure 31 located on the end cover 30 can be set as a convex part 32, and the second limiting structure 12 located on the housing 10 can be arranged in the concave part 13. The structure extending along the axial direction of the opening 11 in the end cover 30 is usually small in size, and the housing 10 has a larger dimension along the axial direction. Arranging the concave part 13 on the housing 10 can increase the optional depth range of the concave part 13.

[0119] Setting the two limiting structures to be in concave-convex fit can make the structure simple, easy to process, and stably cooperate with each other.

[0120] In some alternative embodiments, in the circumferential direction of the opening 11, the size of the concave part 13 is larger than that of the convex part 32.

[0121] Optionally, the size of the concave part 13 in the circumferential direction can be selected to be larger than that of the convex part 32. In the embodiment where multiple first limiting structures 31 are provided on the same end cover 30, the assembly allowances provided by these first limiting structures 31 can be made the same. In the embodiment where the battery cell 100 includes multiple end covers 30, the concave parts 13 corresponding to the two end covers 30 can provide the same assembly allowance, and the assembly allowance can cover the corresponding preset installation position when the deflection angle is 0°, and can be optionally extended equally along both sides in the circumferential direction of the preset installation position to set the assembly allowance.

[0122] Optionally, making the dimension of the concave part 13 extending in the circumferential direction of the opening 11 larger than the dimension of the convex part 32 extending in this direction can enable the end cover 30 and the housing 10 to have a certain assembly allowance when they are assembled with each other, so that they can still be unassembled under the condition of having a small deflection angle, reducing the possibility that the end cover 30 and the housing 10 cannot be smoothly assembled due to small relative deflections caused by machine assembly errors and other reasons, and thus reducing the processing difficulty on the basis of making the deflection range between the end cover 30 and the housing 10 small.

[0123] In some alternative embodiments, the concave part 13 extends along the circumferential direction of the opening 11. The included angle between the connecting lines of the two circumferential ends of the concave part and the central axis of the opening is α, and the included angle between the connecting lines of the two circumferential ends of the convex part and the central axis of the opening is β, and α - β is 1° - 20°.

[0124] In the embodiment where the first and second limiting structures 12 are the convex part 32 and the concave part 13, the concave part 13 can have a certain extension dimension in the circumferential direction of the opening 11, and make the convex part 32 have a certain movement margin in it before the end cover 30 and the housing 10 are fixedly connected. When the convex part 32 moves circumferentially in the concave part 13, the end cover 30 and the housing 10 rotate relative to each other.

[0125] Exemplarily, before the end cap 30 is assembled to the housing 10 and the two are not fixedly connected, by adjusting the circumferential extension dimensions of both the convex portion 32 and the concave portion 13, the convex portion 32 can be reciprocated between the first position and the second position. Thus, the assembly error tolerance can be improved through this movement margin, and the possibility of incomplete assembly caused by the deflection angle can be reduced.

[0126] Exemplarily, in the battery cell 100, after the end cap 30 is assembled to the housing 10, it can be optionally welded to the housing 10. At this time, perpendicular lines are drawn from both ends of the concave portion 13 in the circumferential direction to the central axis of the opening 11, and the included angle between the two perpendicular lines is denoted as α. Similarly, perpendicular lines are drawn from the opposite two ends of the convex portion 32 in the circumferential direction to the central axis, and the included angle between the two perpendicular lines is denoted as β. Then, the difference between α and β can be optionally 1° - 20°, and further optionally 1° - 5°.

[0127] Optionally, the specific numerical value of the difference between α and β can be adjusted by the circumferential extension dimensions of the convex portion 32 and the concave portion 13. By defining the sizes of the aforementioned two included angles, on the basis of making the deflection angle between the end cap 30 and the housing 10 relatively small, there can be a certain installation margin between the two, further improving the installation efficiency of the battery cell 100.

[0128] In some alternative embodiments, in the cross-section parallel to the axial direction of the opening 11, the cross-sectional shape formed by the convex portion 32 is at least one of a semicircle, a trapezoid, a triangle, and a rectangle.

[0129] Optionally, in the cross-section parallel to the axial direction of the opening 11, the convex portion 32 can form a cross-sectional shape of a semicircle, a trapezoid, a triangle, or a rectangle, and this cross-section can be extended along the radial direction of the opening 11 and perpendicular to the circumferential direction of the opening 11.

[0130] Specifically, on the basis of forming the aforementioned cross-sectional shape, each convex portion 32 can be integrally and convexly arranged as a whole. Exemplarily, in the embodiment where the convex portion 32 is a dot-like protrusion, this part of the protruding structure can be in the form of a hemispherical shape, a pyramid shape, a conical shape, a frustum shape, etc.; or, in the embodiment where the convex portion 32 extends a certain dimension in the circumferential direction, this part of the protruding structure can be in the form of a prism shape, a semi-cylindrical shape, etc.

[0131] Setting the cross-sectional shape of the convex portion 32 as one of a variety of shapes that are easy to process can improve the processing efficiency of the convex portion 32, and thus improve the overall processing efficiency of the battery cell 100.

[0132] Please refer to Figure 8 , Figure 8 For Figure 4 another enlarged view of the area P shown.

[0133] In some alternative embodiments, the convex portion 32 includes a plurality of sub-portions 321 arranged in contact with each other, and the sub-portions 321 protrude axially respectively; the plurality of sub-portions 321 are arranged circumferentially around the opening 11, or, the plurality of sub-portions 321 are arranged radially with respect to the opening 11, or, the plurality of sub-portions 321 are arranged in an array.

[0134] In addition to the embodiments in which the convex portion 32 as a whole protrudes integrally as described above, each convex portion 32 may alternatively include a plurality of sub-portions 321 that protrude respectively. These sub-portions 321 may be of the same size and shape and are arranged in sequence in contact with each other, that is, each sub-portion 321 can be in direct contact with an adjacent sub-portion 321 without an intervening area therebetween.

[0135] Optionally, in embodiments where the width of the sub-portion 321 is small, these sub-portions 321 may at least partially extend radially with respect to the opening 11. At this time, each sub-portion 321 may be a dot-like structure, or, each sub-portion 321 may extend parallel to each other circumferentially for a certain distance.

[0136] Or, these sub-portions 321 may at least partially be arranged circumferentially around the opening 11 and are connected to each other to form a convex portion 32 that extends circumferentially for a certain distance. Or, these sub-portions 321 may be dot-like structures and arranged in an array, that is, partially arranged circumferentially and at the same time partially arranged radially.

[0137] Optionally, in embodiments where the convex portion 32 includes a plurality of sub-portions 321, the concave portion 13 may alternatively correspondingly include a plurality of sub-grooves, and the shape of the sub-grooves may be selected to match the sub-portions 321 and the two are arranged in one-to-one correspondence.

[0138] In addition to the structure in which the convex portion 32 protrudes integrally as a whole, the convex portion 32 may also be composed of a plurality of sub-portions 321. By providing a plurality of sub-portions 321, the area of the region where the convex portion 32 and the concave portion 13 interfere with each other circumferentially can be increased. Thereby, the stable reliability after the convex portion 32 and the concave portion 13 are engaged with each other can be improved, and at the same time, the sealing performance at the position where the convex portion 32 and the concave portion 13 are provided can be improved.

[0139] In some alternative embodiments, the housing 10 includes a main body portion 14 and a reinforcing portion 15. The main body portion 14 surrounds the electrode assembly 20. The reinforcing portion 15 is connected to the main body portion 14 and is located at the end of the housing 10 close to the opening 11. In the radial direction of the opening 11, the thickness of the reinforcing portion 15 is greater than the thickness of the main body portion 14; the reinforcing portion 15 includes a second limiting structure 12.

[0140] Optionally, the housing 10 in the battery cell 100 may include a main body portion 14 and a reinforcing portion 15. The main body portion 14 may surround the electrode assembly 20 and be arranged in a cylindrical shape. The reinforcing portion 15 is provided on one side of the main body portion 14 close to the opening 11 and has a thickness greater than that of the main body portion 14, that is, the housing 10 can be locally thickened to provide sufficient space for the arrangement of the second limiting structure 12.

[0141] Exemplarily, the housing 10 may be selected to increase the thickness by means of protruding its inner surface inward and / or protruding its outer surface outward. Exemplarily, the housing 10 may be selected to make the reinforcing portion 15 protrude inward and have an outer surface flush with the main body portion 14, so that the housing 10 can be thickened without increasing the outer volume of the battery cell 100, thereby improving the overall energy density of the battery cell 100. Alternatively, the housing 10 may be selected to protrude outward and have an inner surface flush with the main body portion 14, so that the housing 10 can have a larger opening 11, facilitating the insertion of the electrode assembly 20 and having a larger accommodation space inside.

[0142] Optionally, the reinforcing portion 15 may be selected to extend completely along the circumference of the opening 11 and be arranged in a ring shape. Or, the reinforcing portion 15 may be selected to extend less than one circle so that it corresponds to the second limiting structure 12. In an embodiment where a plurality of second limiting structures 12 are provided on the housing 10, the housing 10 may be selected to include a plurality of sub - portions 321 spaced apart in the circumferential direction. The sub - portions 321 may be correspondingly arranged with the second limiting structures 12 one by one and each sub - portion 321 may have a size slightly larger than the corresponding second limiting structure 12 in the circumferential direction to reduce the overall volume of the housing 10.

[0143] Optionally, a step structure may be formed at the transition position between the reinforcing portion 15 and the main body portion 14 by a plane perpendicular to the axial direction of the opening 11 to reduce the overall volume of the housing 10. Or, at the transition position between the reinforcing portion 15 and the main body portion 14, a bevel may be provided to gradually reduce the thickness of the housing 10 to improve the structural strength of the transition position.

[0144] Exemplarily, the position of the housing 10 where the second limiting structure 12 is provided may be thickened accordingly, so that the second limiting structure 12 has a larger installation space, and at the same time, the structural strength of the position where the second limiting structure 12 is provided is improved, thereby improving the reliability of circumferential limiting.

[0145] In some alternative embodiments, the reinforcing portion 15 is annular and defines the opening 11.

[0146] The reinforcing portion 15 in the housing 10 may optionally extend completely along the circumference of the opening 11 and be arranged in a ring shape. Optionally, the inner surface of this ring structure may be a ring parallel to the inner surface of the main body portion 14, that is, it may be selected to make the thickness of each part of the reinforcing portion 15 equal, so that the force on the main body portion 14 is more uniform. Or, it may be selected to make the reinforcing portion 15 have the largest thickness on the side facing the end cover 30 and have a decreasing thickness in the direction from the reinforcing portion 15 to the main body portion 14, so as to reduce the space required for the reinforcing portion 15.

[0147] In an embodiment where the reinforcing portion 15 is arranged in a ring shape, the opening 11 may optionally be defined by the reinforcing portion 15, that is, the reinforcing portion 15 extends to the end face of the housing 10 where it abuts against the end cover 30, and the opening 11 is formed by enclosing with its inner surface.

[0148] Setting the reinforcing portion 15 as a ring structure that extends completely along the circumference can make the setting position of the second limiting structure 12 more flexible. At the same time, it can also expand the welding area between the end cover 30 and the housing 10, making the welding connection between the end cover 30 and the housing 10 more stable and reliable, thereby improving the reliability of the battery cell 100.

[0149] In some optional embodiments, in the radial direction of the opening 11, the thickness of the reinforcing portion 15 is L1, and the thickness of the main body portion 14 is L2, where 1.5L2 ≤ L1 ≤ 2.5L2; in the axial direction of the opening 11, the dimension of the reinforcing portion 15 accounts for 5% - 10% of the dimension of the housing 10.

[0150] In the radial direction of the opening 11, if the dimension of the reinforcing portion 15 is denoted as L1 and the dimension of the main body portion 14 is denoted as L2, then L1 should be greater than L2, and it may be selected to be between 1.5L2 and 2.5L2. For example, it may be selected as any one of 1.5L2, 1.7L2, 1.9L2, 2.1L2, 2.3L2, 2.5L2 or between any two of them. At the same time, the extension dimension of the reinforcing portion 15 in the axial direction of the opening 11 may be selected to be 5% - 10% of the overall extension dimension of the housing 10, for example, it may be selected as any one of 5%, 6%, 7%, 8%, 9%, 10% or between any two of them.

[0151] Optionally, in an embodiment where the reinforcing portions 15 are arranged at both opposite ends of the housing 10, the thicknesses and axial dimensions of the two reinforcing portions 15 may be selected to be the same, and the second limiting structures 12 arranged on the reinforcing portions 15 may be selected to have the same dimensions and shapes, so that the overall force on the housing 10 is uniform and it is convenient for processing.

[0152] By making the thickness and the dimension in the axial direction of the reinforcing portion 15 within an appropriate range, it is possible to reduce the space required for the reinforcing portion 15 on the basis of facilitating the setting of the second limiting structure 12, and reduce the possibility of interference between the reinforcing portion 15 and other components.

[0153] In some alternative embodiments, in the radial direction, the thickness of the reinforcing portion 15 is L1, and the dimension of the second limiting structure 12 is L3, where 0.5L1 ≤ L3 ≤ L1.

[0154] In the embodiments having the reinforcing portion 15, the second limiting structure 12 on the housing 10 is provided on the reinforcing portion 15. Denote the radial extension dimension of the reinforcing portion 15 as L1, and at the same time denote the extension dimension of the second limiting structure 12 in this direction as L3. Then L3 can be selected to be between 0.5L1 - L1, and can be optionally any one of 0.5L1, 0.6L1, 0.7L1, 0.8L1, 0.9L1, L1 or between any two of them, that is, the size ratio of the second limiting structure 12 in the reinforcing portion 15 is 50% - 100%.

[0155] Taking the second limiting structure 12 as the concave portion 13 as an example, exemplarily, in the embodiments where the radial dimension ratio of the second limiting structure 12 is 50% or close to 50%, the second limiting structure 12 can be located in the middle region of the reinforcing portion 15 in the radial direction, that is, it is not connected to the inner surface and the outer surface of the reinforcing portion 15, so that the second limiting structure 12 has a concave hole structure with at least two opposite side walls in both the circumferential and radial directions.

[0156] Alternatively, in the embodiments where the radial dimension ratio of the second limiting structure 12 is 100% or close to 100%, the second limiting structure 12 can be connected to at least one of the inner and outer surfaces of the reinforcing portion 15, and optionally the second limiting structure 12 is arranged to penetrate the reinforcing portion 15 in the radial direction. In this type of embodiment, the second limiting structure 12 can be optionally a through groove structure having opposite two side surfaces in the circumferential direction.

[0157] By limiting the radial dimension ratio of the second limiting structure 12 in the reinforcing portion 15, the second limiting structure 12 can have a larger setting space in this direction, so as to improve the stability of the limit between the end cover 30 and the housing 10 and facilitate the cooperation between the first and second limiting structures 12.

[0158] In a second aspect, the present application provides a battery 200, including the battery cell 100 in any one of the embodiments of the first aspect.

[0159] In a third aspect, the present application provides an electrical device, including the battery 200 in any one of the embodiments of the second aspect, and this battery 200 is used to provide electrical energy.

[0160] 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 the specific description of the battery cell 100, reference can be made to the above embodiments, and details will not be repeated herein.

[0161] An embodiment of the present application provides a battery cell 100, which includes a housing 10, an electrode assembly 20, and an end cap 30. The housing 10 has an opening 11; the electrode assembly 20 is accommodated in the housing 10, and the end cap 30 is connected to the housing 10 and covers the opening 11. Among them, the end cap 30 is provided with a first limiting structure 31, and the housing 10 is provided with a second limiting structure 12. The first limiting structure 31 cooperates with the second limiting structure 12 to limit the rotation amplitude of the end cap 30 relative to the housing 10 along the circumferential direction of the opening 11. One of the first limiting structure 31 and the second limiting structure 12 includes a convex portion 32, and the other includes a concave portion 13. The two are arranged axially opposite to each other and form a convex-concave fit. The housing 10 includes a main body portion 14 and a reinforcing portion 15. The main body portion 14 is arranged around the electrode assembly 20. The reinforcing portion 15 is connected to the main body portion 14 and is located at the end of the housing 10 close to the opening 11. In the radial direction of the opening 11, the thickness of the reinforcing portion 15 is greater than the thickness of the main body portion 14. The reinforcing portion 15 is annular and defines the opening 11; the reinforcing portion 15 includes the second limiting structure 12.

[0162] 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 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 covered by 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 in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having an opening; An electrode assembly accommodated within the housing, An end cap connected to the housing and covering the opening, Wherein, the end cap is provided with a first limiting structure, the housing is provided with a second limiting structure, and the first limiting structure cooperates with the second limiting structure to limit the rotation amplitude of the end cap relative to the housing along the circumferential direction of the opening.

2. The battery cell according to claim 1, characterized in that, The second limiting structure is disposed on one side of the housing along the axial direction of the opening, and the first limiting structure is disposed on the side of the end cap facing the housing along the axial direction; The first limiting structure and the second limiting structure are opposite to each other along the axial direction and form a concave-convex fit.

3. The battery cell according to claim 1, wherein Both ends of the housing are provided with the opening, and there are two end caps, and both of the two end caps are provided with the first limiting structure.

4. The battery cell according to claim 1, characterized in that, The end cap is provided with a plurality of the first limiting structures, and the plurality of first limiting structures are spaced apart along the circumferential direction of the opening; One end of the housing facing the end cap is provided with a plurality of second limiting structures, and the plurality of second limiting structures are arranged in one-to-one correspondence with the plurality of first limiting structures.

5. The battery cell according to claim 4, characterized in that, The circumferential dimensions of at least two of the first limiting structures are different; or, The radial dimensions of at least two of the first limiting structures are different.

6. The battery cell according to claim 1, wherein One of the first limiting structure and the second limiting structure includes a convex portion, and the other includes a concave portion.

7. The battery cell according to claim 6, wherein, In the circumferential direction of the opening, the size of the concave portion is larger than that of the convex portion.

8. The battery cell according to claim 7, wherein, The concave portion extends along the circumferential direction of the opening, and the included angle between the connecting lines of the two ends of the concave portion along the circumferential direction and the central axis of the opening is α, and the included angle between the connecting lines of the two ends of the convex portion along the circumferential direction and the central axis of the opening is β, and α - β is 1° - 20°.

9. The battery cell according to claim 6, wherein In a cross-section parallel to the axial direction of the opening, the cross-sectional graph formed by the convex portion is at least one of a semi-circle, a trapezoid, a triangle, and a rectangle.

10. The battery cell according to claim 6, characterized in that, The convex portion includes a plurality of connected sub-portions, and the sub-portions protrude along the axial direction of the opening respectively; The plurality of sub-portions are arranged along the circumferential direction of the opening, or the plurality of sub-portions are arranged along the radial direction of the opening, or the plurality of sub-portions are arranged in an array.

11. The battery cell according to claim 1, wherein, The housing includes a main body portion and a reinforcing portion. The main body portion surrounds the electrode assembly. The reinforcing portion is connected to the main body portion and is located at the end of the housing close to the opening. In the radial direction of the opening, the thickness of the reinforcing portion is greater than the thickness of the main body portion; The reinforcing portion includes the second limiting structure.

12. The battery cell according to claim 11, wherein, The reinforcing portion is annular and defines the opening.

13. The battery cell according to claim 11, characterized in that, In the radial direction, the thickness of the reinforcing portion is L1, and the thickness of the main body portion is L2, 1.5L2 ≤ L1 ≤ 2.5L2; In the axial direction of the opening, the size of the reinforcing portion accounts for 5% - 10% of the size of the housing.

14. The battery cell according to claim 11, wherein In the radial direction, the thickness of the reinforcing portion is L1, and the size of the second limiting structure is L3, 0.5L1 ≤ L3 ≤ L1.

15. A battery, characterized in that, Comprising at least one battery cell as described in any one of claims 1 - 14.

16. An electrical device, characterized in that, Comprising a battery as described in claim 15, and the battery is used to provide electrical energy.

Images