End cover assembly, battery monomer, battery and electric device

Abstract

The utility model provides an end cover assembly, a battery monomer, a battery and a power utilization device. The end cover assembly comprises an end cover, the electrode terminal is arranged on the end cover; the adapter comprises a first adapter part and a second adapter part, the first adapter part is used for being connected with the electrode terminal, and the second adapter part is used for being connected with the tab; and the insulating part comprises an insulating body and a limiting part, the insulating body is used for insulating the end cover and the switching part, and the limiting part is used for limiting the movement of the second switching part relative to the insulating part. The adapter is not prone to breakage and high in safety performance.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] The battery includes a battery cell. In the existing battery cell, there is a risk of breakage of the adapter used for connecting the end cover assembly with the pole ear, which affects the safety of the battery cell. Summary of the invention

[0004] In view of the above problems, the present application provides an end cover assembly, a battery cell, a battery and an electrical device, wherein the adapter of the end cover assembly is not easy to break and has high safety performance.

[0005] In the first aspect, the present application provides an end cap assembly, comprising: an end cap; an electrode terminal, arranged on the end cap; a transition piece, comprising a first transition part and a second transition part, the first transition part is used to connect to the electrode terminal, and the second transition part is used to connect to the pole ear; an insulating piece, comprising an insulating body and a limiting part, the insulating body is used to insulate the end cap from the transition piece, and the limiting part is used to limit the movement of the second transition part relative to the insulating piece.

[0006] In the technical solution of the embodiment of the present application, the end cap assembly includes an end cap, an electrode terminal, an adapter and an insulating member. The electrode terminal is arranged on the end cap, and the first adapter portion of the adapter is used to connect with the electrode terminal and the second adapter portion is used to connect with the pole lug, thereby electrically connecting the pole lug and the electrode terminal. The setting of the insulating member can insulate the end cap and the adapter from each other through its insulating body, and limit the movement of the second adapter portion relative to the insulating member through its limiting portion, thereby preventing the second adapter portion from being bent, pulled, etc. under the action of external force, thereby preventing the adapter from being fatigued and fractured, thereby improving the safety performance of the end cap assembly and the battery cell to which it is applied.

[0007] In some embodiments, the limiting portion includes a snap-fit ​​protrusion, and in the thickness direction of the end cover, the snap-fit ​​protrusion is used to limit the movement of the second transition portion in a direction away from the electrode terminal.

[0008] The end cap assembly provided in the embodiment of the present application can provide the second adapter with a limit in the thickness direction by making the limit portion include a clamping protrusion, so as to prevent the second adapter from moving away from the electrode terminal along the thickness direction under the action of external force, so as to effectively resist the pulling force of external components such as the tab and prevent the adapter from being pulled and fatigued and fractured.

[0009] In some embodiments, the surface where the clamping protrusion contacts the second transition portion is a plane.

[0010] The end cover assembly provided in the embodiment of the present application can increase the contact area between the clamping protrusion and the second adapter part by making the surface where the clamping protrusion contacts the second adapter part a plane, thereby enhancing the limiting effect of the clamping protrusion on the second adapter part and preventing the second adapter part from moving relative to the insulating part under the action of external force.

[0011] In some embodiments, a surface of the clamping protrusion facing away from the insulating body is an inclined surface, and the inclined surface is arranged obliquely toward the second transition portion.

[0012] The end cap assembly provided in the embodiment of the present application has an inclined surface on which the snap-fit ​​protrusion faces away from the insulating body, so that when the adapter is pressed between the snap-fit ​​protrusion and the electrode terminal, it can provide guidance to the adapter, thereby facilitating the assembly of the adapter.

[0013] In some embodiments, the limiting portion further includes a connector, which is used to connect the clamping protrusion and the insulating body and limit the second transition portion from moving along a first direction, where the first direction intersects with the thickness direction.

[0014] The end cap assembly provided in the embodiment of the present application can connect the clamping protrusion to the insulating body through the connector by making the limiting part further include a connector, thereby ensuring the relative position between the clamping protrusion and the second adapter. At the same time, the connector can also limit the movement of the second adapter along the first direction, so that the relative position of the second adapter and the insulating member is fixed, which can further improve the position limitation of the second adapter and reduce the probability of fatigue damage of the adapter.

[0015] In some embodiments, the insulating member further includes a supporting portion, which protrudes from a surface of the insulating body facing the second transition portion and is used to limit the second transition portion from moving toward the side where the electrode terminal is located.

[0016] In some embodiments, the limiting portion is disposed on the supporting portion, and the limiting portion is disposed protruding from the supporting portion on a side of the supporting portion away from the electrode terminal.

[0017] The end cap assembly provided in the embodiment of the present application is configured so that the insulating member also includes a support portion. The support portion protruding from the insulating body can limit the second adapter portion from moving toward the side where the electrode terminal is located, thereby preventing the second adapter portion from moving toward the electrode terminal side under the influence of the internal pressure of the battery, etc., limiting the relative position of the second adapter portion to the insulating member, and avoiding fatigue damage to the adapter.

[0018] In some embodiments, the number of the limiting portions is more than two, and the more than two limiting portions are spaced apart and distributed around the second transition portion.

[0019] The end cap assembly provided in the embodiment of the present application has more than two limiting parts, and the more than two limiting parts are spaced apart around the second transition part. The second transition part can be limited by the more than two limiting parts, thereby effectively reducing the movement of the second transition part toward the electrode terminal side under external influences such as the internal pressure of the battery cell.

[0020] In some embodiments, the insulating member further includes a separation ring, which is disposed on the periphery of the limiting portion, and an avoidance gap is formed between the separation ring and the limiting portion.

[0021] The end cover assembly provided in the embodiment of the present application can limit the lateral displacement of structures such as the adapter by setting a separator ring. At the same time, the existence of the avoidance gap facilitates the deformation of the limit portion of the adapter during installation, thereby ensuring the installation requirements of the adapter.

[0022] In some embodiments, the limiting portion includes one of the plug-in portion and the slot, the second transfer portion includes the other of the plug-in portion and the slot, and the plug-in portion can extend into the slot and be snapped into the slot.

[0023] In some embodiments, the limiting portion includes a plurality of slots, and the side of the second transition portion facing the insulating body includes a plurality of plug-in portions, and each plug-in portion can extend into one of the slots and be snapped into the slot.

[0024] The end cap assembly provided in the embodiment of the present application is configured such that the limiting portion includes one of the plug-in portion and the slot, and the second adapter portion includes the other of the plug-in portion and the slot. The plug-in portion can be inserted into the slot and snapped into the slot. The limiting portion and the second adapter portion can be connected through the plug-in portion and the slot that are plug-matched, thereby limiting the second adapter portion, avoiding movement of the second adapter portion relative to the insulating member, and reducing the risk of fatigue fracture of the adapter.

[0025] In some embodiments, the limiting portion includes an adhesive, and the adhesive is adhesively connected to the insulating body and the second transition portion.

[0026] The end cap assembly provided in the embodiment of the present application enables the limiting portion to include an adhesive, so that the relative position between the second adapter portion and the insulating body can be fixed by the adhesive, thereby limiting the movement of the second adapter portion relative to the insulating member. The connection strength is high, and there is no need to make too many improvements to the insulating member and the second adapter portion, and the modification cost is low.

[0027] In a second aspect, the present application provides a battery cell, comprising: a shell having an opening; an electrode assembly disposed in the shell, the electrode assembly comprising a pole ear; the above-mentioned end cover assembly, the end cover is configured to cover the opening and connected to the shell, and the second adapter is electrically connected to the pole ear.

[0028] In a third aspect, the present application provides a battery, including a box and a plurality of the above-mentioned battery cells, wherein the battery cells are accommodated in the box.

[0029] In a fourth aspect, the present application provides an electrical device, comprising the above-mentioned battery cell, and the battery cell is used to provide electrical energy.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0033] Figure 2 is a schematic diagram of the structure of a battery provided in one embodiment of the present application;

[0034] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application;

[0035] Figure 4 is a top view of an end cap assembly provided in one embodiment of the present application;

[0036] Figure 5 yes Figure 4 The cross-sectional view along the AA direction;

[0037] Figure 6 is a schematic structural diagram of an insulating member according to an embodiment of the present application;

[0038] Figure 7 yes Figure 6 A partial enlarged schematic diagram of point B in the middle;

[0039] Figure 8 is a structural schematic diagram of an end cover assembly provided in another embodiment of the present application;

[0040] Fig. 9 is a schematic structural diagram of an adapter provided in another embodiment of the present application;

[0041] Fig.10 is a schematic structural diagram of an insulating member provided in another embodiment of the present application;

[0042] Fig.11 It is a cross-sectional view of an end cover assembly provided in yet another embodiment of the present application.

[0043] The reference numerals in the specific implementation manner are as follows:

[0044] 1000-Vehicles;

[0045] 100-battery; 200-controller; 300-motor;

[0046] 10-box; 11-first part; 12-second part; 13-accommodating space;

[0047] 20-battery cell;

[0048] 21-housing;

[0049] 22-electrode assembly; 221-electrode ear;

[0050] 23-end cover assembly;

[0051] 231-end cover; 2331-electrode lead hole;

[0052] 232-electrode terminal;

[0053] 233-adapter; 2331-first adaptor; 2332-second adaptor; 2332a-insertion part; 2332b-groove;

[0054] 234-insulating member; 2341-insulating body; 2342-limiting portion; 2342a-clamping protrusion; 2342b-connecting body; 2342c-slot; 2342d-adhesive; 2343-supporting portion; 2344-separating ring; 2345-avoidance gap;

[0055] 235-connection block;

[0056] X-thickness direction; Y-first direction. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0066] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0067] The battery cell comprises a shell, an electrode assembly, an electrolyte and an end cap assembly. The electrode terminal of the end cap assembly is electrically connected to the electrode tab of the electrode assembly through its adapter.

[0068] The applicant has noticed that in order to facilitate assembly, the adapter is generally bent. During the use of the battery cell, fatigue is likely to occur at the bend of the adapter, which may lead to the risk of fracture, thus affecting the safety performance of the end cap assembly and the battery cell to which it is applied.

[0069] In order to alleviate the problem that the adapter is prone to fatigue and the risk of breakage, the applicant conducted further in-depth research and found that the pole ear is a flexible part. When the battery cell is subjected to vibration impact, the pole ear will be compressed or elongated in the height direction of the battery cell, thereby pulling the adapter to move in the height direction, causing fatigue at the bend of the adapter, which in turn causes the adapter to break, posing a safety hazard to the end cover assembly and the battery cell used therein.

[0070] In order to alleviate the problem of adapter breakage, the applicant has discovered that the adapter can be restricted in design to prevent it from moving under the influence of external forces such as the tabs, thereby reducing its risk of breakage.

[0071] Based on the above considerations, in order to solve the problem of fatigue fracture of the adapter, the inventor has designed an end cap assembly after in-depth research, which includes an end cap, an electrode terminal, an adapter and an insulating member. The electrode terminal is arranged on the end cap, and the adapter includes a first adapter part and a second adapter part, the first adapter part is used to connect with the electrode terminal, and the second adapter part is used to connect with the pole ear. The insulating member includes an insulating body and a limiting part, the insulating body is used to insulate the end cap from the adapter, and the limiting part is used to limit the movement of the second adapter part relative to the insulating member.

[0072] In such an end cap assembly, the first adapter portion of the adapter is used to connect to the electrode terminal and the second adapter portion is used to connect to the tab, thereby electrically connecting the tab to the electrode terminal. The setting of the insulating member can insulate the end cap and the adapter from each other through its insulating body, and by making the insulating member include a limiting portion, the limiting portion can be used to limit the movement of the second adapter portion relative to the insulating member, thereby preventing the second adapter portion from moving under the action of external force, thereby preventing the adapter from being fatigued and fractured under the external force such as the tab, thereby improving the safety performance of the end cap assembly and the battery cell to which it is applied.

[0073] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries and electrical devices.

[0074] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0075] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery cells, batteries and electrical devices described above, but can also be applied to all batteries including end cover assemblies and electrical equipment using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as examples.

[0076] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0077] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Please refer to Figure 2 as well as Figure 3 , Figure 2 A schematic diagram of the structure of a battery provided in one embodiment of the present application; Figure 3 A schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space 13 for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the storage space 13. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 can be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0079] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells.

[0080] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0081] Please refer to Figure 3 The battery cell 20 refers to the smallest unit of the battery. The battery cell 20 includes a housing 21, an electrode assembly 22 and an end cap assembly 23.

[0082] The shell 21 is a component used to cooperate with the end cap assembly 23 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 21 and the end cap assembly 23 can be independent components, and an opening can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap assembly 23 at the opening. Without limitation, the end cap assembly 23 and the shell 21 can also be integrated. Specifically, the end cap assembly 23 and the shell 21 can form a common connection surface before other components are put into the shell, and when the interior of the shell 21 needs to be encapsulated, the end cap assembly 23 covers the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0083] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 21. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 22, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 221. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 221 connects the electrode terminal 232 to form a current loop.

[0084] The end cap assembly 23 refers to a component that covers the opening of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 23 can be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap assembly 23 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap assembly 23 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved.

[0085] The number of openings of the shell 21 can be one, or two. When there are two openings, the two openings are arranged opposite to each other, and each opening can be covered with an end cover assembly 23, and each end cover assembly 23 is electrically connected to one of the pole ears 221.

[0086] Please refer to Figures 4 to 7 As shown, Figure 4 A top view of an end cap assembly provided in one embodiment of the present application, Figure 5 for Figure 4 The cross-sectional view along the AA direction; Figure 6 This is a schematic structural diagram of an insulating member according to an embodiment of the present application; Figure 7 for Figure 6 A local enlarged schematic diagram of point B in the middle.

[0087] The end cap assembly 23 provided in the embodiment of the present application includes an end cap 231, an electrode terminal 232, a transition piece 233 and an insulating piece 234, wherein the electrode terminal 232 is disposed on the end cap 231. The transition piece 233 includes a first transition part 2331 and a second transition part 2332, wherein the first transition part 2331 is used to connect with the electrode terminal 232, and the second transition part 2332 is used to connect with the tab 221. The insulating piece 234 includes an insulating body 2341 and a limiting part 2342, wherein the insulating body 2341 is used to insulate the end cap 231 from the transition piece 233, and the limiting part 2342 is used to limit the movement of the second transition part 2332 relative to the insulating piece 234.

[0088] Optionally, the end cover 231 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0089] Optionally, the end cover 231 may be a circular or square plate-shaped structure.

[0090] Optionally, the end cap 231 is provided with an electrode lead-out hole 2331, and the electrode lead-out hole 2331 can be set through the end cap 231 along the thickness direction X of the end cap 231. The electrode terminal 232 extends into the electrode lead-out hole 2331 to achieve connection with the end cap 231. A sealing ring can also be provided in the electrode lead-out hole 2331 to achieve sealing between the electrode terminal 232 and the end cap 231.

[0091] Optionally, the adapter 233 may be disposed on a side of the end cap 231 close to the electrode assembly 22, for electrically connecting the electrode assembly 22 to the electrode terminal 232. In the case where the battery cell 20 is a cylindrical battery, the adapter 233 may be configured to be foldable, in other words, the adapter 233 has an unfolded state and a folded state, wherein the adapter 233 is in an unfolded state when not assembled into a finished battery cell 20, and is in a folded state after being assembled into a finished battery cell 20.

[0092] Optionally, the adapter 233 includes a first adapter portion 2331 and a second adapter portion 2332. In the unfolded state, the first adapter portion 2331 and the second adapter portion 2332 are arranged along the first direction Y. The first adapter portion 2331 can be bent relative to the second adapter portion 2332. After the two are bent, a crease is formed, that is, the first adapter portion 2331 and the second adapter portion 2332 are bent relative to each other at the crease. After the first adapter portion 2331 is bent relative to the second adapter portion 2332 along the crease, the first adapter portion 2331 and the second adapter portion 2332 are in a folded state. In the folded state, the second adapter portion 2332 covers the end surface of the electrode assembly 22, and the first adapter portion 2331 is superimposed on the side of the second adapter portion 2332 away from the electrode assembly 22.

[0093] Optionally, the first transition portion 2331 and the electrode terminal 232 may be connected to each other by welding, riveting or the like, and the second transition portion 2332 and the electrode tab 221 may be connected to each other by welding or the like.

[0094] Optionally, the insulating body 2341 of the insulating member 234 may be at least partially disposed between the end cover 231 and the adapter 233 , so that the end cover 231 and the adapter 233 are insulated from each other.

[0095] Optionally, the limiting portion 2342 is used to limit the movement of the second adapter portion 2332 relative to the insulating member 234. Optionally, the second adapter portion 2332 can be limited in the thickness direction X of the end cover 231 or the axial movement of the electrode lead-out hole 2331 relative to the insulating member 234. Of course, the second adapter portion 2332 can also be limited in the direction intersecting the thickness direction X, for example, in the direction perpendicular to the thickness direction X, that is, the radial movement of the electrode lead-out hole 2331.

[0096] Optionally, the limiting portion 2342 and the insulating body 2341 may be an integrated structure, or alternatively, a split structure.

[0097] Optionally, the limiting portion 2342 may contact the second transition portion 2332 and limit the movement of the second transition portion 2332 relative to the insulating member 234 .

[0098] Optionally, the limiting portion 2342 may provide a limit for the second transition portion 2332 in the thickness direction X, so as to limit the movement of the limiting portion 2342 relative to the insulating member 234 .

[0099] Optionally, the limiting portion 2342 can contact the surface of the second transition portion 2332 facing the electrode terminal 232 in the thickness direction X and provide limiting. Of course, the limiting portion 2342 can also contact the surface of the second transition portion 2332 facing away from the electrode terminal 232 in the thickness direction X and provide limiting.

[0100] Optionally, the limiting portion 2342 may include a protruding structure protruding from the insulating body 2341, may include a plug-in portion or a slot, and of course may also include an adhesive, as long as it can provide a limit for the second adapter portion 2332, resist the force from the structure such as the pole ear 221, and prevent the second adapter portion 2332 from moving relative to the insulating member 234.

[0101] In the end cap assembly 23 provided in the embodiment of the present application, the electrode terminal 232 is arranged on the end cap 231, and the first adapter portion 2331 of the adapter 233 is used to connect with the electrode terminal 232 and the second adapter portion 2332 is used to connect with the pole lug 221, thereby making the pole lug 221 electrically connected to the electrode terminal 232. The setting of the insulating member 234 can insulate the end cap 231 and the adapter 233 from each other through its insulating body 2341, and limit the movement of the second adapter portion 2332 relative to the insulating member 234 through its limiting portion 2342, thereby preventing the second adapter portion 2332 from moving under the action of external force, thereby preventing the adapter 233 from being fatigued and fractured, thereby improving the safety performance of the end cap assembly 23 and the battery cell used therein.

[0102] According to some embodiments of the present application, optionally, the limiting portion 2342 includes a snap-fit ​​protrusion 2342 a, and in the thickness direction X of the end cover 231 , the snap-fit ​​protrusion 2342 a is used to limit the second transition portion 2332 from moving in a direction away from the electrode terminal 232 .

[0103] Optionally, the number of the snap-fit ​​protrusions 2342 a may be one, or may be more than two. When there are more than two, the more than two snap-fit ​​protrusions 2342 a may be spaced apart or distributed successively around the second transition portion 2332 .

[0104] Optionally, the engaging protrusion 2342 a may include a protrusion protruding from the insulating body 2341 in the thickness direction X of the end cover 231 .

[0105] Optionally, in the thickness direction X of the end cover 231 , the clamping protrusion 2342a is used to limit the second adapter part 2332 from moving in a direction away from the electrode terminal 232 , that is, the clamping protrusion 2342a is used to limit the second adapter part 2332 from moving in a direction away from the electrode terminal 232 in the axial direction of the electrode lead-out hole 2331 .

[0106] The end cap assembly 23 provided in the embodiment of the present application is provided with a stopper 2342a, by making the stopper 2342 include a clamping protrusion 2342a, so that the second adapter 2332 can be provided with a stopper in the thickness direction X by using the clamping protrusion 2342a, so as to prevent the second adapter 2332 from moving away from the electrode terminal 232 along the thickness direction X under the action of an external force. This effectively resists the pulling force of external components such as the tab 221, and prevents the adapter 233 from being pulled and fatigued to cause fracture.

[0107] According to some embodiments of the present application, optionally, the surface aa where the clamping protrusion 2342a contacts the second transition portion 2332 is a plane.

[0108] Optionally, the surface aa of the locking protrusion 2342a facing the second transition portion 2332 in the thickness direction X may be a plane.

[0109] Optionally, the locking protrusion 2342a may be extended in a direction perpendicular to the thickness direction X toward the surface aa of the second transition portion 2332 in the thickness direction X.

[0110] The end cover assembly 23 provided in the embodiment of the present application can increase the contact area between the clamping protrusion 2342a and the second adapter part 2332 by making the surface aa where the clamping protrusion 2342a contacts the second adapter part 2332 a plane, thereby enhancing the limiting effect of the clamping protrusion 2342a on the second adapter part 2332 and preventing the second adapter part 2332 from moving relative to the insulating member 234 under the action of external force.

[0111] According to some embodiments of the present application, optionally, a surface bb of the locking protrusion 2342a that faces away from the insulating body 2341 is an inclined surface, and the inclined surface is inclined toward the second transition portion 2332 .

[0112] Optionally, the surface bb of the locking protrusion 2342a that is away from the insulating body 2341 in the thickness direction X of the end cover 231 can be made to be an inclined surface.

[0113] Optionally, in a direction perpendicular to the thickness direction X, which can also be understood as the radial direction of the electrode lead-out hole 2331 , the size of the clamping protrusion 2342a in the thickness direction X gradually increases from the side away from the second adapter portion 2332 toward the side of the second adapter portion 2332 .

[0114] Optionally, a surface of the clamping protrusion 2342 a in contact with the second transition portion 2332 and a surface of the clamping protrusion 2342 a facing away from the insulating body 2341 are intersected.

[0115] The end cap assembly 23 provided in the embodiment of the present application has an inclined surface where the snap-fit ​​protrusion 2342a faces away from the insulating body 2341, so that when the adapter 233 is pressed between the snap-fit ​​protrusion 2342a and the electrode terminal 232, it can provide guidance for the adapter 233, thereby facilitating the assembly of the adapter 233.

[0116] According to some embodiments of the present application, optionally, the limiting portion 2342 also includes a connector 2342b, which is used to connect the snap-fit ​​protrusion 2342a and the insulating body 2341 and limit the second transition portion 2332 from moving along the first direction Y, where the first direction Y intersects with the thickness direction X.

[0117] Optionally, the connecting body 2342b, the insulating body 2341 and the snap-in protrusion 2342a may be an integral structure, or they may be formed as separate bodies and then connected to each other.

[0118] Optionally, the number of the connecting bodies 2342b can be the same as the number of the snap-fitting protrusions 2342a and can be arranged one to one. Of course, one connecting body 2342b can also be connected to two or more snap-fitting protrusions 2342a.

[0119] Optionally, the first direction Y may intersect with the thickness direction X of the end cover 231 , and may be perpendicular to each other. Optionally, the first direction Y may also be understood as the radial direction of the electrode lead-out hole 2331 .

[0120] Optionally, the connector 2342 b may be used to limit the radial movement of the second transition portion 2332 along the electrode lead-out hole 2331 .

[0121] Optionally, the connector 2342 b may be disposed so as to protrude from the insulating body 2341 in the thickness direction X of the end cover 231 .

[0122] The end cap assembly 23 provided in the embodiment of the present application, by making the limiting portion 2342 further include a connecting body 2342b, can connect the clamping protrusion 2342a with the insulating body 2341 through the connecting body 2342b, thereby ensuring the relative position between the clamping protrusion 2342a and the second adapter 2332. At the same time, the connecting body 2342b can also limit the movement of the second adapter 2332 along the first direction Y, so that the relative position of the second adapter 2332 and the insulating member 234 is fixed, which can further improve the position limitation of the second adapter 2332 and reduce the probability of fatigue damage of the adapter 233.

[0123] In some optional embodiments, in the end cap assembly 23 provided in the embodiment of the present application, the insulating member 234 further includes a support portion 2343, which protrudes from the surface of the insulating body 2341 toward the second transition portion 2332 and is used to limit the movement of the second transition portion 2332 toward the side where the electrode terminal 232 is located.

[0124] Optionally, the support portion 2343 may protrude from a surface of the insulating body 2341 facing the second transition portion 2332 in the thickness direction X of the end cover 231 .

[0125] Optionally, the support portion 2343 may be a solid or hollow block structure. The support portion 2343 may abut against the adapter 233 to limit the second adapter portion 2332 of the adapter 233 from running along the thickness direction X.

[0126] Optionally, the support portion 2343 may be an arc-shaped structure. The number of the support portion 2343 may be one, or more than two. When there are more than two, the two or more support portions 2343 may be spaced and distributed around a portion of the adapter 233 .

[0127] The end cap assembly 23 provided in the embodiment of the present application makes the insulating part 234 also include a support portion 2343. The support portion 2343 protruding from the insulating body 2341 can limit the second adapter portion 2332 from moving toward the side where the electrode terminal 232 is located, thereby preventing the second adapter portion 2332 from moving toward the electrode terminal 232 under the action of the internal pressure of the battery cell, etc., limiting the relative position of the second adapter portion 2332 to the insulating part 234, and avoiding fatigue damage to the adapter 233.

[0128] In some optional embodiments, in the end cover assembly 23 provided in the embodiment of the present application, the number of the limiting portions 2342 is more than two, and the more than two limiting portions 2342 are distributed around the second adapter portion 2332 at intervals.

[0129] Optionally, the number of the limiting parts 2342 may be two, or may be three, four or even more, and may be specifically set according to the size of the limiting parts 2342 and the limiting requirements for the second adapter part 2332 .

[0130] Optionally, the limiting portions 2342 may be spaced and evenly distributed around the second transition portion 2332 .

[0131] The end cap assembly 23 provided in the embodiment of the present application can limit the second transition portion 2332 by the more than two limiting portions 2342, by ensuring that the number of the limiting portions 2342 is more than two, and the more than two limiting portions 2342 are spaced apart around the second transition portion 2332, thereby effectively reducing the movement of the second transition portion 2332 toward the electrode terminal 232 under external forces such as the internal pressure of the battery cell.

[0132] In some optional embodiments, the limiting portion 2342 may protrude from both the insulating body 2341 and the supporting portion 2343 in the thickness direction X of the end cap 231. The above arrangement can facilitate the supporting portion 2343 and the limiting portion 2342 to jointly limit the movement of the second transition portion 2332 relative to the insulating member 234.

[0133] In some optional embodiments, the insulating member 234 further includes a separation ring 2344 , which is disposed at the periphery of the limiting portion 2342 , and an avoidance gap 2345 is formed between the separation ring 2344 and the limiting portion 2342 .

[0134] Optionally, the separation ring 2344 is used to limit the lateral displacement of the adapter 233 and the like (i.e., in the thickness direction X perpendicular to the end cap 231) to reduce the risk of short circuit. The separation ring 2344 protrudes relative to the insulating body 2341 in the direction close to the electrode assembly 22 and is arranged on the periphery of the adapter 233 to prevent the adapter 233 from contacting the housing 21, so as to prevent the adapter 233 from contacting the housing 21 when the battery cell 20 shakes or the adapter 233 is bent, etc., causing a short circuit problem.

[0135] Specifically, the separation ring 2344 can extend from the insulating body 2341 toward one side of the electrode assembly 22 to the side of the second adapter 2332 close to the electrode assembly 22, so that the separation ring 2344 is arranged around the periphery of the second adapter 2332. In this way, the adapter 233 in the folded state is entirely located within the range defined by the separation ring 2344, so that the separation ring 2344 can limit the lateral displacement of the adapter 233 to a certain extent, thereby preventing the adapter 233 from contacting the housing 21 due to excessive lateral displacement.

[0136] More specifically, in some embodiments, the separator ring 2344 not only extends to the side of the second adapter portion 2332 close to the electrode assembly 22, but can also further extend to the end of the pole ear 221 close to the end cover 231. At this time, the separator ring 2344 is not only arranged around the periphery of the adapter 233, but also around the periphery of the end of the pole ear 221 close to the end cover 231, so that the separator ring 2344 can limit the lateral displacement of the adapter 233 while also playing a certain role in limiting the lateral displacement of the electrode assembly 22, thereby preventing the electrode assembly 22 from contacting the shell 21 due to excessive lateral displacement, causing a short circuit, and preventing the pole ear 221 from bending toward the shell 21 and causing a short circuit.

[0137] In some embodiments, the separator ring 2344 is constructed as a continuous circular ring, but at the same time, the separator ring 2344 is a non-closed circular ring, and a protrusion is provided between the two free ends of the separator ring 2344 for the adapter 233 in the unfolded state to extend. Based on this, the separator ring 2344 can not only reliably limit the lateral displacement of the adapter 233 and reduce the risk of short circuit, but also facilitate the adapter 233 to be assembled into the end cover assembly 23 in the unfolded state first, and then folded.

[0138] In some embodiments, an avoidance gap 2345 is formed between the separation ring 2344 and the limiting portion 2342 , which can be understood as the separation ring 2344 and the limiting portion 2342 are spaced apart from each other in a direction perpendicular to the thickness direction X of the end cover 231 and form an avoidance gap 2345 .

[0139] The end cover assembly 23 provided in the embodiment of the present application can limit the lateral displacement of the adapter 233 and other structures through the separator ring 2344. At the same time, the existence of the avoidance gap 2345 makes it easier for the limit portion 2342 to deform during the installation of the adapter 233, thereby ensuring the installation requirements of the adapter 233.

[0140] See also Figures 8 to 10 , Figure 8 This is a schematic diagram of the structure of an end cap assembly provided in another embodiment of the present application. Fig. 9 This is a schematic diagram of the structure of an adapter provided in another embodiment of the present application. Fig.10 In some optional embodiments, in the end cap assembly 23 provided in the embodiment of the present application, the limiting portion 2342 may include one of the plug-in portion 2332a and the slot 2342c, and the second adapter portion 2332 includes the other of the plug-in portion 2332a and the slot 2342c, and the plug-in portion 2332a can extend into the slot 2342c and be snapped into the slot 2342c.

[0141] Optionally, the position-limiting portion 2342 may include a slot 2342c, and the second adapter portion 2332 may include a plug-in portion 2332a. Of course, the position-limiting portion 2342 may include a plug-in portion 2332a, and the second adapter portion 2332 may include a slot 2342c. The plug-in portion 2332a may penetrate into the slot 2342c and be engaged in the slot 2342c, so that the position-limiting portion 2342 limits the movement of the second adapter portion 2332.

[0142] For example, since the thickness of the second adapter portion 2332 is relatively small, the second adapter portion 2332 may include an inserting portion 2332a, so that the limiting portion 2342 includes a slot 2342c.

[0143] Optionally, the plug-in portion 2332a can extend a predetermined length along the thickness direction X of the end cover 231, and the slot 2342c has an opening along the thickness direction X. The plug-in portion 2332a can be plugged into the inside of the slot 2342c in the thickness direction X to achieve positioning in the thickness direction X.

[0144] Optionally, along the thickness direction X of the end cover 231, the plug-in portion 2332a may be a variable cross-section body. Optionally, the cross-sectional dimension of the plug-in portion 2332a at one end facing the slot 2342c may be greater than the cross-sectional dimension at one end away from the slot 2342c.

[0145] Optionally, the second adapter portion 2332 can be protruded toward one side of the electrode terminal 232 in the thickness direction X to form an insertion portion 2332a. When the support portion 2343 is included, the support portion 2343 can be a hollow structure, and the slot 2342c is opened on the side of the support portion 2343 in the thickness direction X toward the electrode assembly 22.

[0146] Optionally, the number of the plug-in parts 2332a and the slots 2342c may be equal and arranged in one-to-one correspondence. In some optional examples, the number of the plug-in parts 2332a may be more than two, and the number of the corresponding slots 2342c may also be more than two, and each plug-in part 2332a is plug-connected with one of the slots 2342c.

[0147] Optionally, the plug-in portion 2332a can be formed by punching the second adapter portion 2332 along the thickness direction X. When the plug-in portion 2332a is formed by punching, a groove 2332b is formed on the second adapter portion 2332 at a position corresponding to each plug-in portion 2332a.

[0148] The end cover assembly 23 provided in the embodiment of the present application is such that the limiting portion 2342 includes one of the plug-in portion 2332a and the slot 2342c, and the second adapter portion 2332 includes the other of the plug-in portion 2332a and the slot 2342c. The plug-in portion 2332a can extend into the slot 2342c and be snapped into the slot 2342c. The limiting portion 2342 and the second adapter portion 2332 can be connected through the plug-in portion 2332a and the slot 2342c that are plug-fitted, thereby limiting the second adapter portion 2332, avoiding the second adapter portion 2332 from moving relative to the insulating member 234, and reducing the risk of fatigue fracture of the adapter 233.

[0149] See also Fig.11 , Fig.11 A cross-sectional view of an end cap assembly provided in another embodiment of the present application. In some optional embodiments, in the end cap assembly 23 provided in the embodiment of the present application, the limiting portion 2342 includes an adhesive 2342d, and the adhesive 2342d is adhesively connected to the insulating body 2341 and the second transition portion 2332.

[0150] Optionally, the adhesive 2342d may include an insulating colloid, which may be formed by solidifying a liquid flowable adhesive. Of course, it may also include a solid tape with adhesiveness on both sides.

[0151] Optionally, the surface of the second transition portion 2332 facing the electrode terminal 232 in the thickness direction X of the end cover 231 and the surface of the insulating body 2341 facing the electrode assembly 22 in the thickness direction X can be bonded and connected by an adhesive 2342d.

[0152] The end cover assembly 23 provided in the embodiment of the present application, by making the limiting portion 2342 include an adhesive 2342d, can fix the relative position between the second adapter portion 2332 and the insulating body 2341 through the adhesive 2342d, thereby limiting the movement of the second adapter portion 2332 relative to the insulating member 234, and has high connection strength. There is no need to make too many improvements to the insulating member 234 and the second adapter portion 2332, and the modification cost is low.

[0153] It is understandable that the end cap assembly 23 provided in the above embodiments of the present application is respectively illustrated by taking the limiting portion 2342 including the clamping protrusion 2342a, one of the plug-in portion 2332a and the slot 2342c, and the adhesive 2342d as an example. Each form of the limiting portion 2342 can exist independently, and of course can also include two or more of the above at the same time, for example, the limiting portion 2342 can include the clamping protrusion 2342a and the adhesive 2342d at the same time, can include the clamping protrusion 2342a and the plug-in portion 2332a and the slot 2342c at the same time, or can include the adhesive 2342d, the plug-in portion 2332a and the plug, or even include the clamping protrusion 2342a, the plug-in portion 2332a and the slot 2342c, and the adhesive 2342d at the same time, which can be specifically combined arbitrarily according to the limiting requirements of the second adapter 2332.

[0154] According to some embodiments of the present application, the present application provides an end cap assembly 23, which includes an end cap 231, an electrode terminal 232, an adapter 233 and an insulating member 234, wherein the electrode terminal 232 is disposed on the end cap 231. The end cap 231 may be a circular plate-shaped structure, and two electrode lead-out holes 2331 are disposed on the end cap 231, and an electrode terminal 232 is disposed in each electrode lead-out hole 2331, and the two electrode terminals 232 on the same end cap 231 are connected by a connecting block 235. The adapter 233 includes a first adapter portion 2331 and a second adapter portion 2332, wherein the first adapter portion 2331 is electrically connected to the electrode terminal 232, and the second adapter portion 2332 is used to be electrically connected to the tab 221. The adapter 233 is disposed on a side of the insulating member 234 facing the electrode assembly 22. The insulating member 234 includes an insulating body 2341 , a limiting portion 2342 , a supporting portion 2343 and a separating ring 2344 . The limiting portion 2342 includes a snap-fit ​​protrusion 2342 a and a connecting body 2342 b . The insulating body 2341 is used to insulate the end cover 231 from the adapter 233 . The connecting body 2342b is used to connect the clamping protrusion 2342a and the insulating body 2341 and limit the second adapter 2332 to move along the first direction Y, the first direction Y intersects with the thickness direction X of the end cover 231, the surface of the clamping protrusion 2342a in contact with the second adapter 2332 is a plane, the surface of the clamping protrusion 2342a away from the insulating body 2341 is an inclined surface, and the inclined surface is inclined toward the second adapter 2332, the support part 2343 protrudes from the surface of the insulating body 2341 facing the second adapter 2332 and is used to limit the second adapter 2332 to move toward the side where the electrode terminal 232 is located, and the limiting part 2342 is provided on the support part 2343, and the limiting part 2342 is provided on the side of the support part 2343 away from the electrode terminal 232. The number of the limiting parts 2342 is more than two, and the more than two limiting parts 2342 are spaced around the second adapter 2332. The separation ring 2344 is arranged at the periphery of the limiting portion 2342, and an avoidance gap 2345 is formed between the separation ring 2344 and the limiting portion 2342. The clamping protrusion 2342a of the limiting portion 2342 can limit the movement of the insulating member 234 under the action of external components such as the pole ear 221, thereby reducing the risk of fatigue fracture of the adapter 233.

[0155] According to some embodiments of the present application, the present application also provides a battery, comprising the battery cell described in any of the above schemes.

[0156] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery cell as described in any of the above schemes, and the battery cell is used to provide electrical energy to the electrical device.

[0157] The electrical device may be any of the aforementioned devices or systems using battery cells.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; An electrode assembly is disposed in the housing, and the electrode assembly includes a tab; An end cap assembly comprises an end cap, an electrode terminal, a transition piece and an insulating piece, wherein the electrode terminal is arranged on the end cap; the transition piece comprises a first transition part and a second transition part, wherein the first transition part is used to connect to the electrode terminal, and the second transition part is used to connect to the pole lug; the insulating piece comprises an insulating body and a limiting part, wherein the insulating body is used to insulate the end cap from the transition piece, and the limiting part is used to limit the movement of the second transition part relative to the insulating piece, the end cap is configured to cover the opening and be connected to the shell, and the second transition part is electrically connected to the pole lug.

2. The battery cell according to claim 1, characterized in that: The limiting portion includes a clamping protrusion, and in the thickness direction of the end cover, the clamping protrusion is used to limit the second transition portion from moving in a direction away from the electrode terminal.

3. The battery cell according to claim 2, characterized in that: The surface where the clamping protrusion contacts the second transition portion is a plane.

4. The battery cell according to claim 2, characterized in that: The surface of the clamping protrusion facing away from the insulating body is an inclined surface, and the inclined surface is arranged obliquely toward the second transition portion.

5. The battery cell according to claim 2, characterized in that: The limiting portion further includes a connecting body, which is used to connect the clamping protrusion and the insulating body and limit the second transition portion from moving along a first direction, where the first direction intersects with the thickness direction.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The insulating member further includes a supporting portion, which protrudes from a surface of the insulating body facing the second transition portion and is used to limit the second transition portion from moving toward the side where the electrode terminal is located.

7. The battery cell according to claim 6, characterized in that: The limiting portion is disposed on the supporting portion, and the limiting portion is disposed protruding from the supporting portion at a side of the supporting portion away from the electrode terminal.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The number of the limiting portions is more than two, and the more than two limiting portions are distributed around the second transition portion at intervals.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The insulating member further comprises a separation ring, which is arranged at the periphery of the limiting portion, and an escape gap is formed between the separation ring and the limiting portion.

10. The battery cell according to any one of claims 1 to 5, characterized in that: The limiting portion includes one of an inserting portion and a slot, and the second transfer portion includes the other of the inserting portion and the slot. The inserting portion can extend into the slot and be snapped into the slot.

11. The battery cell according to claim 10, characterized in that: The limiting portion includes a plurality of slots, and the second transition portion includes a plurality of plug-in portions on a side facing the insulating body, and each of the plug-in portions can extend into one of the slots and be snapped into the slot.

12. The battery cell according to any one of claims 1 to 5, characterized in that: The limiting portion includes an adhesive, and the adhesive is adhesively connected to the insulating body and the second transition portion.

13. A battery, characterized in that: The invention comprises a box body and a plurality of battery cells according to any one of claims 1 to 12, wherein the battery cells are accommodated in the box body.

14. An electrical device, characterized in that: include: The battery cell according to any one of claims 1 to 12, wherein the battery cell is used to provide electrical energy.

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