End cap assembly, battery cell, battery, and manufacturing equipment and method for battery cell

Abstract

An end cap assembly (23), a battery cell (20), a battery (100), and a manufacturing device (2000) of a battery cell (20), and a method thereof, belong to the field of battery technology. The end cap assembly (23) comprises an end cap (231), an electrode terminal (232), and a connector (233). The end cap (231) is provided with an electrode lead-out hole (2311), and the electrode lead-out hole (2311) penetrates the end cap (231) in the thickness direction (Z) of the end cap (231). The electrode terminal (232) is used to be electrically connected to the electrode assembly (22). The connector (233) is used to connect the end cap (231) to fix the electrode terminal (232). The electrode terminal (232) is arranged opposite to the electrode lead-out hole (2311), and the projection of the electrode terminal (231) in the thickness direction does not overlap with the projection of the end cap (231) in the thickness direction. The connecting piece (233) serves to connect the electrode terminal (231) and the end cover (231), thereby fixing the electrode terminal (231) and the end cover (231). Since the electrode terminal (232) and the electrode lead-out hole (2311) are arranged opposite to each other, and the projection of the electrode terminal (232) in the thickness direction (Z) does not overlap with the projection of the end cover (231) in the thickness direction, the radial dimension of the electrode terminal (232) is smaller, the space occupied by the electrode terminal (232) is reduced, materials are saved, and the economy is better.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular, to an end cap assembly, a battery cell, a battery, and a manufacturing device and method for a battery cell. Background Art

[0002] At present, the batteries most commonly used in vehicles are generally lithium-ion batteries. As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.

[0003] A rechargeable battery generally includes a housing, an end cap assembly and an electrode assembly. The end cap assembly is covered on the housing to provide a closed space for the electrode assembly and the electrolyte. The electric energy of the electrode assembly can be led out of the housing through the electrode terminal of the end cap assembly.

[0004] For a general end cap assembly, the electrode terminal is limited by the structure of the end cap, and the electrode terminal occupies a large space. Summary of the invention

[0005] The embodiments of the present application provide an end cap assembly, a battery cell, a battery, and a manufacturing device and method for the battery cell to improve the problem of a large space occupied by electrode terminals.

[0006] In a first aspect, an embodiment of the present application provides an end cap assembly for a battery cell, wherein the battery cell includes an electrode assembly, and the end cap assembly includes an end cap, an electrode terminal and a connector; the end cap is provided with an electrode lead-out hole, and the electrode lead-out hole penetrates the end cap in the thickness direction of the end cap; the electrode terminal is used to be electrically connected to the electrode assembly; the connector is used to connect the end cap to fix the electrode terminal; wherein the electrode terminal is arranged opposite to the electrode lead-out hole, and the projection of the electrode terminal in the thickness direction does not overlap with the projection of the end cap in the thickness direction.

[0007] In the above scheme, the connector plays the role of connecting the electrode terminal and the end cap, thereby fixing the electrode terminal and the end cap. Since the electrode terminal and the electrode lead-out hole are arranged opposite to each other, and the projection of the electrode terminal in the thickness direction does not overlap with the projection of the end cap in the thickness direction, that is, the electrode terminal does not cover the electrode lead-out hole on the end cap, the radial dimension of the electrode terminal is smaller, the space occupied by the electrode terminal is reduced, materials are saved, and it has better economy.

[0008] In some embodiments, the connecting member clamps the electrode terminal so that the electrode terminal is fixed to the connecting member.

[0009] In the above solution, the connector fixes the electrode terminal by clamping the electrode terminal, which has a simple structure and the electrode terminal is not easy to separate from the connector under the clamping effect of the connector.

[0010] In some embodiments, the connecting member is circumferentially wrapped around the outer circumference of the electrode terminal so that the connecting member clamps the electrode terminal.

[0011] In the above solution, the connecting member is wrapped around the outer circumference of the electrode terminal, so that the overall structure after the connecting member fixes the electrode terminal is more compact.

[0012] In some embodiments, the connecting member includes a surrounding body, a first limiting portion and a second limiting portion;

[0013] The first limiting portion and the second limiting portion are both provided on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the first limiting portion and the second limiting portion are arranged at intervals in the thickness direction, the enclosure, the first limiting portion and the second limiting portion jointly define a accommodating space, and the electrode terminal is at least partially located in the accommodating space.

[0014] In the above scheme, the electrode terminal is at least partially located in the accommodating space defined by the surrounding body, the first limiting portion and the second limiting portion, so that the first limiting portion and the second limiting portion both play an axial limiting role on the electrode terminal, and the surrounding body can play a radial limiting role on the electrode terminal, which can effectively limit the electrode terminal from being separated from the connecting piece.

[0015] In some embodiments, the electrode terminal includes a main body portion and a protruding portion;

[0016] The main body is used to be electrically connected to the electrode assembly, and the protrusion is connected to the main body and extends into the accommodation space along a direction perpendicular to the thickness direction.

[0017] In the above scheme, the protrusion extends into the accommodating space in a direction perpendicular to the thickness direction of the end cover, so that the first limiting portion and the second limiting portion limit the protrusion of the electrode terminal to prevent the electrode terminal from detaching from the connector along the thickness direction of the end cover.

[0018] In some embodiments, the first limiting portion is closer to the electrode assembly than the second limiting portion, the inner side wall of the second limiting portion defines a through hole, and the main body passes through the through hole along the thickness direction and extends to the outside of the connecting member.

[0019] In the above solution, the main body passes through the through hole along the thickness direction of the end cover and extends to the outside of the connecting piece, so as to facilitate the connection between the electrode terminal and other components.

[0020] In some embodiments, the electrode terminal abuts against the first limiting portion and the second limiting portion to limit the movement of the electrode terminal relative to the connecting member along the thickness direction.

[0021] In the above solution, the electrode terminal abuts against the first limiting portion and the second limiting portion, which can effectively limit the movement of the electrode terminal relative to the connecting member in the thickness direction.

[0022] In some embodiments, the connector is sealingly connected to the end cap.

[0023] In the above solution, the connecting piece is sealed and connected to the end cover to ensure the sealing between the connecting piece and the end cover.

[0024] In some embodiments, the connecting member is at least partially inserted into the electrode lead-out hole.

[0025] In the above scheme, the connector is at least partially inserted into the electrode lead-out hole. On the one hand, the connector can be positioned; on the other hand, the space inside the electrode lead-out hole is reasonably utilized, which can effectively reduce the space outside the end cover occupied by the connector.

[0026] In some embodiments, the electrode terminal is at least partially inserted into the electrode lead-out hole.

[0027] In the above solution, the electrode assembly is at least partially inserted into the electrode lead-out hole, which rationally utilizes the space inside the electrode lead-out hole and can effectively reduce the space outside the end cover occupied by the electrode terminal.

[0028] In some embodiments, the end cover has a first end face and a second end face arranged relatively to each other in the thickness direction, the first end face is closer to the electrode assembly than the second end face; along the direction from the second end face to the first end face, the connecting member does not extend beyond the first end face.

[0029] In the above solution, the connector is no closer to the first end face of the electrode assembly than the end cover, and the connector does not occupy the space outside the end cover on the side of the first end face away from the second end face, freeing up more space for other components in the battery cell.

[0030] In some embodiments, the connecting member has a third end face and a fourth end face that are arranged opposite to each other in the thickness direction; the third end face is flush with the first end face, and the second end face is located between the third end face and the fourth end face in the thickness direction.

[0031] In the above scheme, the third end face is flush with the first end face, which, on the one hand, improves the flatness of the side of the connector and the end cap close to the electrode assembly, and on the other hand, allows the connector to be inserted deeper into the electrode lead-out hole, improving the stability of the connector after being inserted into the electrode lead-out hole. Since the second end face is located between the third end face and the fourth end face in the thickness direction, the connector has a portion that exceeds the second end face of the end cap, which facilitates the installation of the connector.

[0032] In some embodiments, an outer side wall of the connecting member is provided with an abutment portion, and the abutment portion is used to abut against the end cover in the thickness direction.

[0033] In the above solution, the abutting portion on the outer side wall of the connecting member abuts against the end cover in the thickness direction of the end cover, thereby limiting the position of the connecting member in the thickness direction of the end cover.

[0034] In some embodiments, the end cover is provided with a receiving groove for receiving the abutting portion.

[0035] In the above solution, the receiving groove on the end cover can accommodate the abutting portion, thereby reducing the space occupied by the abutting portion outside the end cover.

[0036] In some embodiments, the abutment portion is arranged circumferentially along the outer wall of the connector, and the accommodating groove is arranged around the electrode lead-out hole.

[0037] In the above solution, the abutment portion is arranged circumferentially along the outer wall of the connector, and the accommodating groove is arranged around the electrode lead-out hole, so that the abutment portion is also arranged around the electrode lead-out hole, thereby improving the stability of the connector after being connected to the end cover.

[0038] In some embodiments, the end cover has a first end face and a second end face arranged opposite to each other in the thickness direction, the first end face is closer to the electrode assembly than the second end face; and the accommodating groove is opened on the first end face or the second end face.

[0039] In the above solution, the receiving groove can be opened on the first end surface of the end cover, or can be opened on the second end surface of the end cover. If the receiving groove is opened on the first end surface of the end cover, the abutting portion abuts against the end cover along the direction from the first end surface to the second end surface; if the receiving groove is opened on the second end surface of the end cover, the abutting portion abuts against the end cover along the direction from the second end surface to the first end surface.

[0040] In some embodiments, the abutment portion has a welding surface for welding with the end cover; the accommodating groove is opened on the first end surface, and the welding surface is flush with the first end surface; or, the accommodating groove is opened on the second end surface, and the welding surface is flush with the second end surface.

[0041] In the above scheme, when the accommodating groove is opened on the first end face, the welding surface of the abutment part is flush with the first end face, and welding can be performed at the junction of the welding surface and the first end face, so as to facilitate welding and fixing the abutment part to the end cover; when the accommodating groove is opened on the second end face, the welding surface of the abutment part is flush with the second end face, and welding can be performed at the junction of the welding surface and the second end face, so as to facilitate welding and fixing the abutment part to the end cover.

[0042] In some embodiments, the end cap assembly further includes a barrier; an accommodation gap is formed between the inner contour of the connector and the outer contour of the electrode terminal, and the barrier is at least partially disposed within the accommodation gap to prevent the electrode terminal from contacting the connector.

[0043] In the above solution, the barrier located in the accommodating gap has a barrier effect on the connecting member and the electrode terminal, thereby preventing the electrode terminal from directly contacting the connecting frame.

[0044] In some embodiments, the barrier member includes a sealing portion; the sealing portion is at least partially located in the accommodating gap to achieve a sealed connection between the electrode terminal and the connector.

[0045] In the above solution, the sealing portion in the barrier member can realize the sealed connection between the electrode terminal and the connector, and the electrolyte (such as electrolyte) in the battery cell is not easy to leak out from between the connector and the end cover.

[0046] In some embodiments, the barrier member includes an insulating portion; the insulating portion is at least partially located in the accommodating gap to achieve insulation isolation between the electrode terminal and the connecting member.

[0047] In the above solution, the insulating portion in the barrier member can be used to achieve insulation isolation between the electrode terminal and the connector.

[0048] In some embodiments, the barrier member includes a conductive portion; the conductive portion is at least partially located in the accommodating gap to achieve electrical connection between the electrode terminal and the connecting member.

[0049] In the above solution, the electrical connection between the electrode terminal and the connecting member can be achieved through the conductive portion in the barrier member.

[0050] In some embodiments, a portion of the connector is inserted into the electrode lead-out hole, and a portion of the connector is located outside the electrode lead-out hole; a portion of the barrier covers the portion of the connector located outside the electrode lead-out hole.

[0051] In the above solution, a portion of the barrier member covers the portion of the connector outside the electrode lead-out hole, and the barrier member plays a good protective role on the portion of the connector exposed outside the end cover.

[0052] In some embodiments, the connecting member includes a surrounding body and a first limiting portion;

[0053] The first limiting portion is provided on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the electrode terminal is at least partially located within the enclosure, the first limiting portion and the electrode terminal form a first gap, the enclosure and the electrode terminal form a second gap connected to the first gap, the first gap and the second gap both form part of the accommodating gap, a portion of the barrier is located within the first gap, and a portion of the barrier is located within the second gap.

[0054] In the above solution, a part of the blocking member is located in the first gap formed by the first limiting part and the electrode terminal, and a part of the blocking member is located in the second gap formed by the surrounding body and the electrode terminal, so as to block the electrode terminal from the connecting member. The electrode terminal can abut against the first limiting part through the part of the blocking member located in the first gap, so that the first limiting part plays an axial limiting role on the electrode terminal; the electrode terminal can abut against the surrounding body through the part of the blocking member located in the second gap, so that the surrounding body plays a radial limiting role on the electrode terminal.

[0055] In some embodiments, the connector also includes a second limiting portion spaced apart from the first limiting portion in the thickness direction of the end cover; the second limiting portion is disposed on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the second limiting portion and the electrode terminal form a third gap connected to the second gap, the third gap forms a part of the accommodating gap, and a part of the barrier is located in the third gap.

[0056] In the above solution, a portion of the barrier is located in the third gap, and the electrode terminal can be pressed against the second limiting portion through the portion of the barrier located in the third gap. Under the limiting action of the first limiting portion and the second limiting portion, the axial movement of the electrode terminal can be limited.

[0057] In a second aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and an end cap assembly provided by any embodiment of the first aspect; the shell has an opening; the electrode assembly is accommodated in the shell; the end cap is configured to cover the opening, and the electrode terminal is configured to be electrically connected to the electrode assembly.

[0058] In a third aspect, an embodiment of the present application provides a battery, comprising a housing and a battery cell provided by any one embodiment of the second aspect, wherein the battery cell is accommodated in the housing.

[0059] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any one embodiment of the second aspect.

[0060] In a fifth aspect, an embodiment of the present application provides a method for manufacturing a battery cell, comprising: providing a shell having an opening; providing an electrode assembly; providing an end cap assembly, the end cap assembly comprising an end cap, an electrode terminal and a connector, the end cap being provided with an electrode lead-out hole, the electrode lead-out hole penetrating the end cap in the thickness direction of the end cap, the electrode terminal being used to be electrically connected to the electrode assembly, the connector being used to connect the end cap to fix the electrode terminal, wherein the electrode terminal is arranged opposite to the electrode lead-out hole, and a projection of the electrode terminal in the thickness direction does not overlap with a projection of the end cap in the thickness direction; accommodating the electrode assembly in the shell; sealing the end cap on the opening, and electrically connecting the electrode terminal to the electrode assembly.

[0061] In the sixth aspect, an embodiment of the present application also provides a manufacturing device for a battery cell, comprising a first providing device, a second providing device, a third providing device and an assembling device; the first providing device is used to provide a shell having an opening; the second providing device is used to provide an electrode assembly; the third providing device is used to provide an end cap assembly, the end cap assembly comprising an end cap, an electrode terminal and a connecting member, the end cap being provided with an electrode lead-out hole, the electrode lead-out hole penetrating the end cap in the thickness direction of the end cap, the electrode terminal being used to be electrically connected to the electrode assembly, the connecting member being used to connect the end cap to fix the electrode terminal, wherein the electrode terminal is arranged opposite to the electrode lead-out hole, and the projection of the electrode terminal in the thickness direction does not overlap with the projection of the end cap in the thickness direction; the assembling device is used to accommodate the electrode assembly in the shell and seal the end cap on the opening; wherein the electrode terminal is electrically connected to the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0063] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0064] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0065] Figure 3 for Figure 2 A schematic diagram of the structure of the battery module shown;

[0066] Figure 4An exploded view of a battery cell provided for some embodiments of the present application;

[0067] Figure 5 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0068] Figure 6 A schematic diagram of the structure of an end cap assembly provided in some embodiments of the present application;

[0069] Figure 7 for Figure 6 A top view of the end cap assembly is shown;

[0070] Figure 8 A schematic diagram of the structure of an end cap assembly provided in some other embodiments of the present application;

[0071] Fig. 9 A schematic diagram of the structure of an end cap assembly provided in some further embodiments of the present application;

[0072] Fig.10 A schematic diagram of the structure of an electrode assembly provided in other embodiments of the present application;

[0073] Fig.11 A schematic diagram of connection (direct connection) between an electrode terminal and a connector provided in some embodiments of the present application;

[0074] Fig.12 A schematic diagram of connection (direct connection) between electrode terminals and connectors provided for some embodiments of the present application;

[0075] Fig.13 A schematic diagram of connection (indirect connection) between an electrode terminal and a connector provided in some embodiments of the present application;

[0076] Fig.14 A schematic diagram of connection (indirect connection) between electrode terminals and connectors provided in some other embodiments of the present application;

[0077] Fig.15 A schematic diagram of connection (indirect connection) between electrode terminals and connectors provided in some other embodiments of the present application;

[0078] Fig.16 A schematic diagram of connection (indirect connection) between electrode terminals and connectors provided in other embodiments of the present application;

[0079] Fig.17 A schematic diagram of connection (indirect connection) between electrode terminals and connectors provided in yet other embodiments of the present application;

[0080] Fig.18 A schematic diagram of connection (indirect connection) between electrode terminals and connectors provided in yet other embodiments of the present application;

[0081] Fig.19 A schematic diagram of the connection of electrode terminals, connectors and end caps provided in some embodiments of the present application;

[0082] Fig. 20 A flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application;

[0083] Fig.21 A schematic block diagram of a battery cell manufacturing device provided in some embodiments of the present application;

[0084] In the drawings, the drawings are not drawn to scale.

[0085] Marking description: 10-box; 11-first part; 12-second part; 13-sealed space; 20-battery cell; 21-housing; 211-opening; 22-electrode assembly; 221-positive electrode sheet; 222-negative electrode sheet; 223-separator; 23-end cover assembly; 231-end cover; 2311-electrode lead hole; 2312-first end face; 2313-second end face; 2314-accommodation groove; 232-electrode terminal; 2321-main body; 2322-protrusion; 2323-annular recess; 233-connector; 2331-third end face; 2332-fourth end face; 2333-abutment portion; 2333a-welding surface; 2334-surrounding body; 2334a-annular protrusion; 2335-first limiting portion; 2335a-penetration hole ;2336-second limiting portion;2336a-through hole;2337-accommodating space;235-adapter;2351-piece body;2352-protrusion;236-insulating member;237-blocking member;2371-sealing portion;2372-insulating portion;2373-conductive portion;238-accommodating gap;2381-first gap;2382-second gap;2382a-transition gap;2383-third gap;24-pressure relief mechanism;30-battery module;31-collector component;100-battery;200-controller;300-motor;1000-vehicle;2000-manufacturing equipment;2100-first providing device;2200-second providing device;2300-third providing device;2400-assembling device;Z-thickness direction. DETAILED DESCRIPTION

[0086] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0087] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0088] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0089] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0091] The term "plurality" used in the present application refers to two or more (including two).

[0092] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0093] 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.

[0094] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0095] The battery cell may also include a shell and an end cap assembly, wherein the end cap assembly is covered on the shell to provide an enclosed space for the electrode assembly and the electrolyte, the electrode assembly is electrically connected to the electrode terminal of the end cap assembly, and the electric energy of the electrode assembly can be led out of the shell through the electrode terminal of the end cap assembly.

[0096] The inventors found that for a general end cap assembly, the electrode terminal is limited by the structure of the end cap, and the electrode terminal occupies a large space. After research, it was found that in the end cap assembly, the electrode terminal needs to cover the electrode lead-out hole on the end cap, resulting in a large space occupied by the electrode terminal.

[0097] In view of this, the embodiment of the present application provides a technical solution, which fixes the electrode terminal to the end cap by a connector, sets the electrode terminal and the electrode lead-out hole opposite to each other, and makes the projection of the electrode terminal in the thickness direction and the projection of the end cap in the thickness direction not overlap. This makes the radial dimension of the electrode terminal smaller, reduces the space occupied by the electrode terminal, saves materials, and has better economy.

[0098] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries.

[0099] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0100] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0101] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed 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.

[0102] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0103] In some embodiments, the battery 100 can not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0104] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application, the battery 100 includes a box 10 and a battery cell 20 ( Figure 2 The battery cell 20 is housed in the box body 10 .

[0105] The box body 10 is used to provide a closed space for the battery cells 20 . The box body 10 can be in various shapes, such as a cylinder, a cuboid, etc. Figure 2 In the embodiment, the box body 10 is illustratively a rectangular parallelepiped.

[0106] In some embodiments, Figure 2 As shown, the box body 10 may include a first portion 11 and a second portion 12, and the first portion 11 and the second portion 12 cover each other to define a sealed space 13 for accommodating the battery cell 20. The first portion 11 may be a hollow structure with one side open, and the second portion 12 may also be a hollow structure with one side open, and the open side of the second portion 12 covers the open side of the first portion 11, thereby forming the box body 10 with the sealed space 13.

[0107] exist Figure 2 In the embodiment, the second part 12 is located on the upper side of the first part 11, the second part 12 can also be called an upper box body, and the first part 11 can also be called a lower box body.

[0108] In the battery 100, there can be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 can be connected in series, in parallel or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. The battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the battery cells 20 can be accommodated in the box 10; of course, the battery cells 20 can also be connected in series, in parallel or in a mixed connection to form a battery module 30, and then the battery modules 30 can be connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10. The battery cell 20 can be cylindrical, flat, rectangular or in other shapes.

[0109] In some embodiments, please refer to Figure 3 , Figure 3 for Figure 2 The battery module 30 is shown as a schematic diagram of the structure of the battery module 30. There are multiple battery cells 20, and the multiple battery cells 20 are first connected in series or in parallel or in mixed series to form a battery module 30, and the multiple battery modules 30 are then connected in series or in parallel or in mixed series to form a whole and accommodated in the box 10.

[0110] In some embodiments, the battery 100 may further include a busbar 31, and multiple battery cells 20 may be electrically connected through the busbar 31 to achieve series connection, parallel connection, or mixed connection of multiple battery cells 20. Taking two battery cells 20 connected in series as an example, the positive electrode terminal of one battery cell 20 is connected to the negative electrode terminal of another battery cell 20 through the busbar 31 to achieve the series connection of the two battery cells 20.

[0111] Please refer to Figure 4 , Figure 4 An exploded view of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 may include a housing 21, an electrode assembly 22, and an end cap assembly 23, wherein the housing 21 has an opening 211, the electrode assembly 22 is accommodated in the housing 21, and the end cap assembly 23 includes an end cap 231 and an electrode terminal 232, wherein the end cap 231 is used to seal the opening 211, and the electrode terminal 232 is used to be electrically connected to the electrode assembly 22.

[0112] The shell 21 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0113] The outer shell 21 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the outer shell 21 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the outer shell 21 can be a cuboid structure. Figure 4 In the figure, illustratively, the housing 21 and the electrode assembly 22 are both rectangular parallelepiped structures.

[0114] The electrode assembly 22 may include a positive electrode sheet 221, a negative electrode sheet 222, and a separator 223. Figure 5 , Figure 5 The schematic diagram of the structure of the electrode assembly 22 provided in some embodiments of the present application, the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet 221, the separator 223 and the negative electrode sheet 222. In some other embodiments, the electrode assembly 22 may also be a stacked structure formed by stacking the positive electrode sheet 221, the separator 223 and the negative electrode sheet 222.

[0115] In some embodiments, the electrode assembly 22 may also include a positive electrode tab (not shown) and a negative electrode tab (not shown). The positive electrode tab may be a positive electrode collector in the positive electrode sheet 221 that is not coated with a positive electrode active material layer, and the negative electrode tab may be a negative electrode collector in the negative electrode sheet 222 that is not coated with a negative electrode active material layer.

[0116] In the embodiment of the present application, the end cap 231 of the end cap assembly 23 is used to cover the opening 211 of the housing 21 to form a closed space (not shown) for accommodating the battery cell 20. The closed space is also used to accommodate electrolytes, such as electrolytes. The electrode terminal 232 of the end cap assembly 23 is used as a component for outputting the electrical energy of the electrode assembly 22. The electrode terminal 232 is used to be electrically connected to the electrode assembly 22, that is, the electrode terminal 232 is electrically connected to the electrode tab of the electrode assembly 22. For example, the electrode terminal 232 and the electrode tab are connected via a transfer sheet 235 (see Figure 6 ) is connected to achieve electrical connection between the electrode terminal 232 and the electrode tab.

[0117] It should be noted that the number of openings 211 of the housing 21 can be one or two.

[0118] In some embodiments, Figure 4 As shown, the housing 21 has one opening 211, and the end cap assembly 23 may also be one. Two electrode terminals 232 may be provided in the end cap assembly 23. The two electrode terminals 232 are respectively a positive electrode terminal and a negative electrode terminal. The positive electrode terminal and the negative electrode terminal are respectively used to electrically connect to the positive electrode tab and the negative electrode tab of the electrode assembly 22. The battery cell 20 having such a structure may be a square battery cell 20.

[0119] In some other embodiments, the housing 21 has two openings 211, for example, the two openings 211 are arranged on opposite sides of the housing 21, and the end cap assemblies 23 may also be two, and the two end cap assemblies 23 are respectively covered at the two openings 211 of the housing 21. In this case, the electrode terminal 232 in one end cap assembly 23 may be a positive electrode terminal, which is used to be electrically connected to the positive electrode tab of the electrode assembly 22; and the electrode terminal 232 in the other end cap assembly 23 may be a negative electrode terminal, which is used to be electrically connected to the negative electrode sheet 222 of the electrode assembly 22. The battery cell 20 having such a structure may be a cylindrical battery cell 20.

[0120] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 24 mounted on the end cover 231 , and the pressure relief mechanism 24 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0121] Exemplarily, the pressure relief mechanism 24 may be an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve, etc.

[0122] The specific structure of the end cover assembly 23 is described in detail below with reference to the accompanying drawings.

[0123] Please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the end cover assembly 23 provided in some embodiments of the present application. Figure 7 for Figure 6 The end cap assembly 23 includes an end cap 231, an electrode terminal 232, and a connector 233. The end cap 231 is provided with an electrode lead-out hole 2311, which penetrates the end cap 231 in the thickness direction Z of the end cap 231. The electrode terminal 232 is used to connect to the electrode assembly 22 (see Figure 4) is electrically connected. The connector 233 is used to connect the end cap 231 to fix the electrode terminal 232. The electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, and the projection of the electrode terminal 232 in the thickness direction Z of the end cap 231 does not overlap with the projection of the end cap 231 in the thickness direction Z.

[0124] Since the electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, and the projection of the electrode terminal 232 in the thickness direction Z of the end cover 231 does not overlap with the projection of the end cover 231 in the thickness direction Z, that is, the electrode terminal 232 does not cover the electrode lead-out hole 2311 on the end cover 231, the radial size (perpendicular to the thickness direction Z of the end cover 231) of the electrode terminal 232 is smaller, which reduces the space occupied by the electrode terminal 232, saves materials, and has better economy.

[0125] It should be noted that the radial direction of the electrode terminal 232 does not limit the electrode terminal 232 to be cylindrical, and the electrode terminal 232 may also be in other shapes, for example, the electrode terminal 232 is in the shape of a polygonal column. The electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, that is, the electrode terminal 232 and the electrode lead-out hole 2311 are basically aligned in the thickness direction Z of the end cover 231, and the electrode terminal 232 and the electrode lead-out hole 2311 may be arranged coaxially, or the axis of the electrode terminal 232 may be arranged parallel to the axis of the electrode lead-out hole 2311. Since the electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, and the projection of the electrode terminal 232 in the thickness direction Z of the end cover 231 does not overlap with the projection of the end cover 231 in the thickness direction Z, if the electrode terminal 232 is moved along the thickness direction Z of the end cover 231, the electrode terminal 232 will pass through the electrode lead-out hole 2311 without interfering with the end cover 231.

[0126] In the end cap assembly 23, there can be one or two electrode terminals 232. If there is one electrode terminal 232 in the end cap assembly 23, the electrode lead-out hole 2311 on the end cap 231 can also be set to one. In the battery cell 20, the end cap assembly 23 can be set to two, the electrode terminal 232 of one end cap assembly 23 is a positive electrode terminal, and the electrode terminal 232 of the other end cap assembly 23 is a negative electrode terminal. If there are two end cap assemblies 23, there can also be two electrode lead-out holes 2311 on the end cap 231. In the battery cell 20, the end cap assembly 23 can be set to one, one electrode terminal 232 in the end cap assembly 23 is a positive electrode terminal, and the other electrode terminal 232 in the end cap assembly 23 is a negative electrode terminal. Figure 7 In the figure, the case where there are two electrode terminals 232 in the end cap assembly 23 is exemplarily shown.

[0127] In some embodiments, please refer to Figure 6 The end cap assembly 23 may also include a transfer sheet 235, an electrode terminal 232 and an electrode assembly 22 (see Figure 4 ) are electrically connected through the adapter 235.

[0128] The adapter 235 may be a metal conductor, such as copper, iron, aluminum, etc.

[0129] Exemplarily, the adapter sheet 235 includes a sheet body 2351 and a protrusion 2352, the sheet body 2351 is located on the side of the end cap 231 close to the electrode assembly 22, the sheet body 2351 is used to connect to the pole ear of the electrode assembly 22, the protrusion 2352 is connected to the sheet body 2351, and protrudes from the sheet body 2351 to the side close to the end cap 231, the protrusion 2352 can extend into the electrode lead-out hole 2311 and connect with the electrode terminal 232 to realize the electrical connection between the electrode terminal 232 and the electrode assembly 22.

[0130] In some embodiments, the end cap assembly 23 may further include an insulating member 236 , and the insulating member 236 is used to achieve insulation isolation between the end cap 231 and the adapter plate 235 .

[0131] Illustratively, in the thickness direction Z of the end cover 231 , the insulating member 236 is at least partially located between the sheet body 2351 of the adapter sheet 235 and the end cover 231 to achieve insulation isolation between the end cover 231 and the adapter sheet 235 .

[0132] The insulating member 236 serves as an insulator between the end cap 231 and the adapter plate 235. The insulating member 236 is made of insulating material, which may be made of rubber, plastic, or the like. The plastic may be PBT (Polybutylene terephthalate), PET (Polyethylene terephthalate), PA (Polyamide), or the like.

[0133] In the end cover assembly 23, the end cover 231 is used to cover the housing 21 (see Figure 4 ) opening 211. The end cap 231 may be a plate-like structure, which may be circular, rectangular, etc. The shape of the end cap 231 may be determined according to the shape of the housing 21. For example, if the housing 21 is a rectangular parallelepiped, the end cap 231 may be a rectangular end cap; for another example, if the housing 21 is a cylinder, the end cap 231 may be a circular end cap.

[0134] The end cap 231 has a first end surface 2312 and a second end surface 2313 opposite to each other in the thickness direction Z. The first end surface 2312 is closer to the electrode assembly 22 than the second end surface 2313 (see Figure 4 ), the electrode lead-out hole 2311 passes through the first end surface 2312 and the second end surface 2313.

[0135] The electrode lead-out hole 2311 on the end cap 231 may be a hole of equal diameter, that is, the radius of the electrode lead-out hole 2311 does not change in the thickness direction Z of the end cap 231. The electrode lead-out hole 2311 on the end cap 231 may also be a variable diameter hole, such as a stepped hole. Of course, the electrode terminal 232 may be a cylindrical structure of equal diameter, or a variable diameter structure, such as a stepped shaft. The maximum diameter of the electrode lead-out hole 2311 is not less than the maximum diameter of the electrode terminal 232, so that the projection of the electrode terminal 232 in the thickness direction Z of the end cap 231 does not overlap with the projection of the end cap 231 in the thickness direction Z.

[0136] In the embodiment of the present application, the connector 233 serves to connect the electrode terminal 232 and the end cap 231, thereby fixing the electrode terminal 232 to the end cap 231. The connector 233 and the end cap 231 can be connected in a variety of connection methods, and the electrode terminal 232 and the connector 233 can also be connected in a variety of connection methods. The specific structure of the connection between the connector 233 and the end cap 231, and the specific structure of the connection between the electrode terminal 232 and the connector 233 are described in detail below.

[0137] First, the specific structure of the connection between the connecting member 233 and the end cover 231 is described in detail.

[0138] In some embodiments, the connector 233 is sealed to the end cap 231 to ensure the sealing between the connector 233 and the end cap 231 , and the electrolyte (such as electrolyte) in the battery cell 20 is not easy to leak from the connection position between the connector 233 and the end cap 231 .

[0139] The sealed connection between the connector 233 and the end cover 231 can be achieved in a variety of ways. For example, the sealed connection between the connector 233 and the end cover 231 can be achieved by a tight fit between the connector 233 and the end cover 231, or by providing a seal between the connector 233 and the end cover 231, or by welding the connector 233 and the end cover 231 together to achieve a sealed connection between the two.

[0140] In some embodiments, the connector 233 is at least partially inserted into the electrode lead-out hole 2311. This structure can realize the positioning of the connector 233 on the one hand, and reasonably utilize the space inside the electrode lead-out hole 2311 on the other hand, which can effectively reduce the space occupied by the connector 233 outside the end cap 231.

[0141] In this embodiment, the sealed connection between the connector 233 and the end cap 231 can be achieved in a variety of ways. For example, the outer wall of the connector 233 forms a tight fit with the hole wall of the electrode lead-out hole 2311 to achieve a sealed connection between the connector 233 and the end cap 231; for another example, a sealing ring is provided between the hole wall of the electrode lead-out hole 2311 and the outer wall of the connector 233 to achieve a sealed connection between the connector 233 and the end cap 231; for another example, the connector 233 and the end cap 231 are connected together by welding, so that the solder blocks the gap between the outer wall of the connector 233 and the hole wall of the electrode lead-out hole 2311 to achieve a sealed connection between the connector 233 and the end cap 231.

[0142] In some embodiments, along the direction from the second end face 2313 of the end cap 231 to the first end face 2312, the connector 233 does not extend beyond the first end face 2312 of the end cap 231. This structure allows the connector 233 to not occupy the space outside the end cap 231 on the side of the first end face 2312 away from the second end face 2313, freeing up more space for other components in the battery cell 20 (such as the insulating member 236), providing more space for the electrode assembly 22, and improving the energy density of the battery cell 20.

[0143] Optionally, the connecting member 233 has a third end face 2331 and a fourth end face 2332 arranged opposite to each other in the thickness direction Z of the end cover 231, and the third end face 2331 is closer to the electrode assembly 22 than the fourth end face 2332. The third end face 2331 is flush with the first end face 2312, and the second end face 2313 is located between the third end face 2331 and the fourth end face 2332 in the thickness direction Z of the end cover 231.

[0144] Since the third end face 2331 is flush with the first end face 2312, on the one hand, the flatness of the connector 233 and the end cap 231 close to the electrode assembly 22 is improved, and on the other hand, the connector 233 is inserted deeper into the electrode lead-out hole 2311, which improves the stability of the connector 233 after being inserted into the electrode lead-out hole 2311. Since the second end face 2313 is located between the third end face 2331 and the fourth end face 2332 in the thickness direction Z of the end cap 231, the connector 233 has a portion that exceeds the second end face 2313 of the end cap 231, which facilitates the installation of the connector 233.

[0145] It should be noted that the third end face 2331 is flush with the first end face 2312 , which does not limit the first end face 2312 to be absolutely flush with the second end face 2313 , and a small distance between the third end face 2331 and the first end face 2312 is allowed within an error range.

[0146] The second end surface 2313 is located between the third end surface 2331 and the fourth end surface 2332 in the thickness direction Z of the end cover 231, that is, a part of the connecting member 233 is inserted into the electrode lead-out hole 2311. In other embodiments, the fourth end surface 2332 may be located between the first end surface 2312 and the second end surface 2313, so that the connecting member 233 is completely inserted into the electrode lead-out hole 2311.

[0147] In some embodiments, please refer to Figure 8 and Fig. 9 , Figure 8 This is a schematic diagram of the structure of the end cover assembly 23 provided in some other embodiments of the present application. Fig. 9 This is a schematic structural diagram of the end cover assembly 23 provided in some further embodiments of the present application, in which the outer wall of the connecting member 233 is provided with abutment portion 2333 , and the abutment portion 2333 is used to abut against the end cover 231 in the thickness direction Z of the end cover 231 .

[0148] During the process of inserting the connecting piece 233 into the electrode lead-out hole 2311, when the abutting portion 2333 abuts against the end cover 231 in the thickness direction Z of the end cover 231, the connecting piece 233 cannot be further inserted into the electrode lead-out hole 2311, thereby limiting the connecting piece 233 in the thickness direction Z of the end cover 231.

[0149] There are various abutment forms between the abutment portion 2333 and the end cover 231 . For example, the abutment portion 2333 directly abuts against the first end surface 2312 of the end cover 231 ; or the abutment portion 2333 directly abuts against the second end surface 2313 of the end cover 231 .

[0150] Of course, the abutting portion 2333 and the end cap 231 may also have other abutting forms. In some embodiments, the end cap 231 is provided with a receiving groove 2314 for receiving the abutting portion 2333. That is, the end cap 231 abuts against the bottom wall of the receiving groove 2314. The provision of the receiving groove 2314 on the end cap 231 can reduce the space outside the end cap 231 occupied by the abutting portion 2333.

[0151] The abutting portion 2333 may be arranged along the circumference of the outer wall of the connecting member 233, and the containing groove 2314 may be arranged around the electrode lead-out hole 2311. Exemplarily, the abutting portion 2333 and the containing groove 2314 are both annular structures.

[0152] In some embodiments, Figure 8 As shown, the receiving groove 2314 can be opened on the first end surface 2312 of the end cover 231. In other embodiments, such as Fig. 9As shown, it can also be opened on the second end surface 2313. If the receiving groove 2314 is opened on the first end surface 2312 of the end cover 231, the abutting portion 2333 abuts against the end cover 231 along the direction from the first end surface 2312 to the second end surface 2313; if the receiving groove 2314 is opened on the second end surface 2313 of the end cover 231, the abutting portion 2333 abuts against the end cover 231 along the direction from the second end surface 2313 to the first end surface 2312.

[0153] In some embodiments, the abutting portion 2333 and the end cover 231 are welded to achieve fixation of the connecting member 233 and the end cover 231 .

[0154] Exemplarily, the abutment portion 2333 has a welding surface 2333a for welding with the end cover 231. Figure 8 As shown, if the receiving groove 2314 is opened on the first end surface 2312, the welding surface 2333a of the abutting portion 2333 can be flush with the first end surface 2312. In this case, welding can be performed at the intersection of the welding surface 2333a and the first end surface 2312 to facilitate welding and fixing the abutting portion 2333 and the end cover 231; Fig. 9 As shown, if the accommodating groove 2314 is opened on the second end surface 2313, the welding surface 2333a can be flush with the second end surface 2313. In this case, welding can be performed at the junction of the welding surface 2333a and the second end surface 2313 to facilitate welding and fixing the abutting portion 2333 and the end cover 231.

[0155] It should be noted that the welding surface 2333a is flush with the first end surface 2312, which is not limited to being absolutely flush (coplanar) with the first end surface 2312, and a small distance between the welding surface 2333a and the first end surface 2312 is allowed within the error range. Similarly, the welding surface 2333a is flush with the second end surface 2313, which is not limited to being absolutely flush (coplanar) with the second end surface 2313, and a small distance between the welding surface 2333a and the second end surface 2313 is allowed within the error range.

[0156] When the abutment portion 2333 is arranged circumferentially along the outer wall of the connector 233 and the accommodating groove 2314 is arranged around the electrode lead-out hole 2311 , welding can be performed along the entire circumference of the edge of the welding surface 2333 a to achieve a sealed connection between the connector 233 and the end cover 231 .

[0157] It can be seen from the above embodiments that the connection member 233 and the end cap 231 can be connected by at least partially inserting the connection member 233 into the electrode lead-out hole 2311. Fig.10 , Fig.10In the structural schematic diagram of the electrode assembly 22 provided in other embodiments of the present application, the connector 233 may not be inserted into the electrode lead-out hole 2311. For example, the connector 233 is located on the side of the end cover 231 away from the electrode assembly 22, and the third end face 2331 of the connector 233 contacts the second end face 2313 of the end cover 231 and is welded together.

[0158] In some embodiments, Figure 6 , 8 and Fig. 9 As shown, after the electrode terminal 232 and the end cap 231 are connected together by the connector 233, the electrode terminal 232 can be at least partially inserted into the electrode lead-out hole 2311, which reasonably utilizes the space inside the electrode lead-out hole 2311 and can effectively reduce the space outside the end cap 231 occupied by the electrode terminal 232. Fig.10 As shown, the electrode terminal 232 may also be located completely outside the electrode lead-out hole 2311 .

[0159] Next, the specific structure of the connection between the electrode terminal 232 and the connecting member 233 is described in detail.

[0160] In some embodiments, the connection member 233 is clamped on the electrode terminal 232 so that the electrode terminal 232 is fixed to the connection member 233 .

[0161] The connecting member 233 fixes the electrode terminal 232 by clamping the electrode terminal 232 , and has a simple structure. The electrode terminal 232 is not easily separated from the connecting member 233 under the clamping effect of the connecting member 233 .

[0162] The connector 233 may have a variety of structures to achieve clamping and fixing of the electrode terminal 232. The connector 233 may clamp the electrode terminal 232 in the radial direction (direction perpendicular to the thickness direction Z of the end cap 231) or in the axial direction (thickness direction Z of the end cap 231).

[0163] In some embodiments, please refer to Fig.11 and Fig.12 , Fig.11 Schematic diagram of connection (direct connection) between electrode terminal 232 and connector 233 provided in some embodiments of the present application, Fig.12A schematic diagram of the connection (direct connection) between the electrode terminal 232 and the connector 233 provided for some embodiments of the present application, the connector 233 is circumferentially coated on the outer circumference of the electrode terminal 232 so that the connector 233 is clamped on the electrode terminal 232. This structure makes the overall structure more compact after the connector 233 fixes the electrode terminal 232. It should be noted that the connector 233 is circumferentially coated on the outer circumference of the electrode terminal 232, and the circumferential direction referred to here is the clockwise or counterclockwise direction in the plane, and the plane is perpendicular to the thickness direction Z of the end cover 231. The coating referred to here can be full-circumferential coating or non-full-circumferential coating. If the connector 233 is circumferentially coated on the outer circumference of the electrode terminal 232, the connector 233 can be a full-ring structure; if the connector 233 is non-circumferentially coated on the outer circumference of the electrode terminal 232, the connector 233 can be a "C"-shaped structure with a central angle greater than 180 degrees. For example, in Fig.11 and Fig.12 In the embodiment, the connecting member 233 is entirely circumferentially wrapped around the outer periphery of the electrode terminal 232 .

[0164] When the connecting piece 233 is at least partially inserted into the electrode lead-out hole 2311, the connecting piece 233 circumferentially covers the outer circumference of the electrode terminal 232, so that the outer side wall of the electrode terminal 232 is separated from the hole wall of the electrode lead-out hole 2311, thereby making the radial dimension of the electrode terminal 232 smaller than the radial dimension of the electrode lead-out hole 2311, so that the projection of the electrode terminal 232 in the thickness direction Z of the end cover 231 does not overlap with the projection of the end cover 231 in the thickness direction Z.

[0165] When the connector 233 is inserted into the electrode lead-out hole 2311 , the connector 233 is inserted into the electrode lead-out hole 2311 to a certain depth so that the electrode terminal 232 can be at least partially inserted into the electrode lead-out hole 2311 .

[0166] In some embodiments, please refer to Fig.11 , Fig.11 for Figure 6 The connection diagram of the electrode terminal 232 and the connecting member 233 is shown. The connecting member 233 includes a surrounding body 2334 and a first limiting portion 2335. The first limiting portion 2335 is provided on the inner side wall of the surrounding body 2334 and arranged along the circumference of the surrounding body 2334. The electrode terminal 232 is at least partially located in the surrounding body 2334. The first limiting portion 2335 is used to limit the electrode terminal 232 from being separated from the connecting member 233 in the direction close to the electrode assembly 22.

[0167] Among them, the enclosure 2334 is coated on the outer circumference of the connecting piece 233, and the enclosure 2334 can play a radial limiting role on the electrode terminal 232. For example, the outer wall of the electrode terminal 232 is abutted against the inner wall of the enclosure 2334, so that the connecting piece 233 can clamp the electrode terminal 232 in the radial direction (in the direction perpendicular to the thickness direction Z of the end cover 231), that is, the clamping force applied by the enclosure 2334 of the connecting piece 233 to the electrode terminal 232 is in the radial direction (in the direction perpendicular to the thickness direction Z of the end cover 231) of the electrode terminal 232. The abutment referred to here can be direct abutment or indirect abutment. For example, in Fig.11 In the embodiment, the outer wall of the electrode terminal 232 directly abuts against the inner wall of the enclosure 2334 .

[0168] When the outer wall of the electrode terminal 232 directly contacts the inner wall of the enclosure 2334, the connector 233 may be an insulating component, such as rubber, plastic, etc., or a conductive component, such as copper, iron, aluminum, a plastic component with conductive function, etc. If the electrode terminal 232 is to be insulated from the end cap 231, the connector 233 may be an insulating component; if the electrode terminal 232 is to be electrically connected to the end cap 231, the connector 233 may be a conductive metal. Taking the end cap assembly 23 including two electrode terminals 232 (a positive electrode terminal and a negative electrode terminal) as an example, the connector 233 connected to one electrode terminal 232 may be an insulating component, and the connector 233 connected to the other electrode terminal 232 may be a conductive component. Of course, the two connectors 233 respectively connected to the two electrode terminals 232 may also be insulating components.

[0169] Exemplarily, the surrounding body 2334 is a cylindrical structure with two ends open, and the first limiting portion 2335 is an annular structure arranged on the inner wall of the surrounding body 2334 .

[0170] The inner side wall of the first limiting portion 2335 defines a penetration hole 2335a. The adapter plate 235 (see Figure 6 ) can enter the connector 233 through the penetration hole 2335a to be connected to the electrode terminal 232.

[0171] It should be noted that if Figure 6 As shown, when the connector 233 is at least partially inserted into the electrode lead-out hole 2311, the outer diameter of the enclosure 2334 can match the hole diameter of the electrode lead-out hole 2311, so that the enclosure 2334 can be inserted into the electrode lead-out hole 2311. Fig.10 As shown, when the connector 233 is not inserted into the electrode lead-out hole 2311, the outer diameter of the enclosure 2334 is greater than the inner diameter of the electrode lead-out hole 2311. Fig.12As shown, the connector 233 may further include a second limiting portion 2336, which is disposed on the inner side wall of the enclosure 2334 and arranged along the circumference of the enclosure 2334. The second limiting portion 2336 and the first limiting portion 2335 are arranged at intervals in the thickness direction Z of the end cover 231. The first limiting portion 2335 is closer to the electrode assembly 22 than the second limiting portion 2336. The enclosure 2334, the first limiting portion 2335, and the second limiting portion 2336 jointly define a receiving space 2337, and the electrode terminal 232 is at least partially located in the receiving space 2337. Both the first limiting portion 2335 and the second limiting portion 2336 can limit the electrode terminal 232 in the axial direction (the thickness direction Z of the end cover 231). The second limiting portion 2336 is used to limit the electrode terminal 232 from detaching from the connector 233 in a direction away from the electrode assembly 22.

[0172] Exemplarily, the electrode terminal 232 abuts against the first limiting portion 2335, and the electrode terminal 232 abuts against the second limiting portion 2336, so that the connector 233 clamps the electrode terminal 232 in the axial direction (the thickness direction Z of the end cap 231), that is, the clamping force applied by the first limiting portion 2335 and the second limiting portion 2336 of the connector 233 to the electrode terminal 232 is in the axial direction (the thickness direction Z of the end cap 231) of the electrode terminal 232, so as to limit the movement of the electrode terminal 232 relative to the connector 233 along the thickness direction Z of the end cap 231. The abutment referred to here can be direct abutment or indirect abutment. Fig.12 In the embodiment, illustratively, the electrode terminal 232 directly abuts against the first limiting portion 2335 , and the electrode terminal 232 also directly abuts against the second limiting portion 2336 .

[0173] It should be noted that when the electrode terminal 232 abuts against the first limiting portion 2335 and the electrode terminal 232 abuts against the second limiting portion 2336, that is, when the first limiting portion 2335 and the second limiting portion 2336 clamp the electrode terminal 232, the inner side wall of the enclosure 2334 of the connecting member 233 and the outer side wall of the electrode terminal 232 may not abut against each other, that is, the enclosure 2334 does not radially clamp the electrode terminal 232 (in the direction perpendicular to the thickness direction Z of the end cover 231).

[0174] Exemplarily, the second limiting portion 2336 may be an annular structure disposed on the inner wall of the enclosure 2334 , and the accommodating space 2337 is an annular space.

[0175] In some embodiments, please refer to Fig.12 The electrode terminal 232 includes a main body 2321 and a protruding portion 2322 . The protruding portion 2322 is connected to the main body 2321 and extends into the accommodation space 2337 along a direction perpendicular to the thickness direction Z of the end cover 231 .

[0176] The main body 2321 is used for electrical connection of the electrode assembly 22. Figure 6 )'s sheet body 2351 is connected to the electrode assembly 22, and the protrusion 2352 of the adapter sheet 235 is connected to the main body 2321, then the electrical connection between the main body 2321 and the electrode assembly 22 can be achieved.

[0177] Exemplarily, the main body 2321 is a cylindrical structure, and the protrusion 2322 is an annular structure disposed on the outer side wall of the main body 2321 .

[0178] In some embodiments, the inner side wall of the second limiting portion 2336 defines a through hole 2336a, and the main body 2321 passes through the through hole 2336a along the thickness direction Z of the end cover 231 and extends to the outside of the connector 233 to facilitate the connection of the electrode terminal 232 with other components (such as a collector component).

[0179] In other embodiments, when the connector 233 is circumferentially wrapped around the outer periphery of the electrode terminal 232, the connector 233 may also be other structures. For example, the connector 233 only includes a casing 2334, and the outer wall of the electrode terminal 232 abuts against the inner wall of the casing 2334, so that the connector 233 can clamp the electrode terminal 232 radially (in the direction perpendicular to the thickness direction Z of the end cover 231).

[0180] In some embodiments, please refer to Fig.13 and Fig.14 , Fig.13 Schematic diagram of connection (indirect connection) between electrode terminal 232 and connector 233 provided in some embodiments of the present application, Fig.14 The schematic diagram of the connection (indirect connection) between the electrode terminal 232 and the connector 233 provided in some other embodiments of the present application, the end cap assembly 23 further includes a barrier 237, and an accommodation gap 238 is formed between the inner contour of the connector 233 and the outer contour of the electrode terminal 232, and the barrier 237 is at least partially disposed in the accommodation gap 238 to prevent the electrode terminal 232 from contacting the connector 233. In other words, the connector 233 is indirectly connected to the electrode terminal 232 through the barrier 237.

[0181] In some embodiments, the barrier 237 includes a sealing portion 2371, which is at least partially located in the accommodating gap 238 to achieve a sealed connection between the electrode terminal 232 and the connector 233, so that the electrolyte (electrolyte) in the battery cell 20 is not easily leaked from between the connector 233 and the end cover 231.

[0182] Exemplarily, the material of the sealing portion 2371 may be rubber, such as polyurethane rubber, acrylic rubber, silicone rubber, etc.

[0183] The barrier member 237 may be partially or entirely a sealing portion 2371 .

[0184] In some embodiments, the barrier 237 includes an insulating portion 2372 , and the insulating portion 2372 is at least partially located in the accommodating gap 238 to achieve insulation isolation between the electrode terminal 232 and the connector 233 .

[0185] For example, the insulating portion 2372 may be made of plastic, rubber, etc. The connecting member 233 may be a conductive member, such as copper, iron, aluminum, a plastic member having a conductive function, etc.

[0186] The barrier member 237 may be partially the insulating portion 2372 or entirely the insulating portion 2372 .

[0187] In a non-limiting example, Fig.13 As shown, the sealing portion 2371 and the insulating portion 2372 are both part of the barrier 237. In this case, the hardness of the sealing portion 2371 can be less than that of the insulating portion 2372, so that the sealing portion 2371 is more easily deformed under the extrusion of the electrode terminal 232 and the connecting member 233 than the insulating portion 2372, and the sealing portion 2371 has a better sealing effect between the electrode terminal 232 and the connecting member 233.

[0188] The sealing portion 2371 and the insulating portion 2372 may be independent of each other or may be attached together.

[0189] In some embodiments, the barrier 237 further includes a conductive portion 2373 , and the conductive portion 2373 is at least partially located in the accommodating gap 238 to achieve electrical connection between the electrode terminal 232 and the connector 233 .

[0190] Exemplarily, the conductive part 2373 may be a conductive component, such as copper, iron, aluminum, a plastic part with conductive function, etc.

[0191] The barrier member 237 may be partially or entirely the conductive portion 2373 .

[0192] In a non-limiting example, Fig.14 As shown, the sealing portion 2371 and the conductive portion 2373 are both part of the barrier 237. The sealing portion 2371 and the conductive portion 2373 can be independent of each other or attached together.

[0193] In some embodiments, Fig.13 and Fig.14As shown, the connecting member 233 includes a surrounding body 2334 and a first limiting portion 2335. The first limiting portion 2335 is provided on the inner side wall of the surrounding body 2334 and is arranged along the circumference of the surrounding body 2334. The electrode terminal 232 is at least partially located in the surrounding body 2334. The first limiting portion 2335 and the electrode terminal 232 form a first gap 2381. The surrounding body 2334 and the electrode terminal 232 form a second gap 2382 connected to the first gap 2381. The first gap 2381 and the second gap 2382 both form a part of the accommodating gap 238. A part of the blocking member 237 is located in the first gap 2381, and a part of the blocking member 237 is located in the second gap 2382.

[0194] A portion of the blocking member 237 is located in a first gap 2381 formed by the first limiting portion 2335 and the electrode terminal 232, so that the electrode terminal 232 and the first limiting portion 2335 are indirectly abutted against each other. The electrode terminal 232 can abut against the first limiting portion 2335 through the portion of the blocking member 237 located in the first gap 2381, so that the first limiting portion 2335 plays an axial (thickness direction Z of the end cover 231) limiting role on the electrode terminal 232; a portion of the blocking member 237 is located in a second gap 2382 formed by the enclosure 2334 and the electrode terminal 232, so that the outer wall of the electrode terminal 232 and the inner wall of the enclosure 2334 are indirectly abutted against each other. The electrode terminal 232 can abut against the enclosure 2334 through the portion of the blocking member 237 located in the second gap 2382, so that the enclosure 2334 plays a radial (direction perpendicular to the thickness direction Z of the end cover 231) limiting role on the electrode terminal 232.

[0195] In some embodiments, Fig.13 As shown, taking the example that the sealing portion 2371 and the insulating portion 2372 are both part of the barrier 237 , the sealing portion 2371 may be at least partially located in the first gap 2381 , and the insulating portion 2372 may be at least partially located in the second gap 2382 .

[0196] Illustratively, a portion of the insulating portion 2372 may also be located in the first gap 2381, and a portion of the sealing portion 2371 may also be located in the penetration hole 2335a defined by the inner wall of the second limiting portion 2336, and the portion of the sealing portion 2371 located in the penetration hole 2335a forms a positioning fit with the penetration hole 2335a.

[0197] In some embodiments, please refer to Fig.15 , Fig.15A schematic diagram of the connection (indirect connection) between the electrode terminal 232 and the connecting member 233 provided in some further embodiments of the present application, wherein one of the inner wall of the enclosure 2334 and the outer wall of the electrode terminal 232 is provided with an annular protrusion 2334a, and the other is provided with an annular recess 2323, the annular protrusion 2334a is partially located in the annular recess 2323, a transition gap 2382a is formed between the outer contour of the annular protrusion 2334a and the inner contour of the annular recess 2323, the transition gap 2382a forms a part of the second gap 2382, and a part of the barrier 237 is located in the transition gap 2382a.

[0198] The annular protrusion 2334 a is partially located in the annular recess 2323 , and the annular recess 2323 has a restraining effect on the annular protrusion 2334 a , limiting the electrode terminal 232 from moving in a direction away from the first limiting portion 2335 .

[0199] For example, Fig.15 As shown, the annular protrusion 2334 a is distributed around the inner wall of the enclosure 2334 , and the annular recess 2323 is distributed around the outer wall of the electrode terminal 232 .

[0200] In some embodiments, please refer to Figure 16-18 As shown, Fig.16 Schematic diagram of connection (indirect connection) between electrode terminal 232 and connector 233 provided in other embodiments of the present application, Fig.17 Schematic diagram of connection (indirect connection) between electrode terminal 232 and connector 233 provided in yet other embodiments of the present application, Fig.18 Schematic diagram of the connection (indirect connection) between the electrode terminal 232 and the connector 233 provided in some other embodiments of the present application, the connector 233 also includes a second limiting portion 2336 arranged in a spaced relationship from the first limiting portion 2335 in the thickness direction Z of the end cap 231. The second limiting portion 2336 is provided on the inner side wall of the enclosure 2334 and arranged along the circumference of the enclosure 2334. The second limiting portion 2336 and the electrode terminal 232 form a third gap 2383 connected to the second gap 2382. The third gap 2383 forms a part of the accommodating gap 238, and a part of the blocking member 237 is located in the third gap 2383.

[0201] A portion of the blocking member 237 is located in the third gap 2383, so that the electrode terminal 232 and the second limiting portion 2336 are indirectly abutted against each other. The second limiting portion 2336 and the first limiting portion 2335 can both limit the electrode terminal 232 to limit the axial movement of the electrode terminal 232 (the thickness direction Z of the end cover 231).

[0202] For example, the sealing portion 2371 and the insulating portion 2372 are both part of the barrier 237. Fig.16As shown, at least a portion of the sealing portion 2371 may be located in the first gap 2381, and a portion of the insulating portion 2372 may be located in the second gap 2382 and the third gap 2383; Fig.17 As shown, at least a portion of the sealing portion 2371 may be located in the third gap 2383, and a portion of the insulating portion 2372 may be located in the first gap 2381 and the second gap 2382. Fig.18 As shown, at least a portion of the sealing portion 2371 may be located in the second gap 2382, and a portion of the insulating portion 2372 may be located in the first gap 2381 and the third gap 2383. For example, the insulating portion 2372 may include two independent sections, one section may be located in the first gap 2381, and the other end may be located in the third gap 2383.

[0203] In some embodiments, please refer to Fig.19 , Fig.19 A connection diagram of the electrode terminal 232, the connector 233 and the end cap 231 provided for some embodiments of the present application; a portion of the connector 233 is inserted into the electrode lead-out hole 2311, a portion of the connector 233 is located outside the electrode lead-out hole 2311, and a portion of the barrier 237 is covered on the portion of the connector 233 located outside the electrode lead-out hole 2311, so as to provide good protection for the portion of the connector 233 exposed outside the end cap 231.

[0204] Exemplarily, the insulating portion 2372 in the barrier 237 covers a portion of the connector 233 extending beyond the second end face 2313 of the end cover 231 in a direction from the first end face 2312 of the end cover 231 to the second end face 2313 , so as to increase the creepage distance between the electrode terminal 232 and the end cover 231 .

[0205] like Fig.19 As shown, taking the example that the sealing portion 2371 and the insulating portion 2372 are both part of the barrier 237 , at least a portion of the sealing portion 2371 is located in the first gap 2381 , and a portion of the insulating portion 2372 is located in the second gap 2382 and the third gap 2383 .

[0206] It should be noted that the portion of the insulating portion 2372 located in the third gap 2383 and the second gap 2382 and the portion of the insulating portion 2372 covering the outside of the electrode lead-out hole 2311 may be an integral structure or may be separate structures independent of each other.

[0207] It can be seen from the above embodiments that the connector 233 can clamp the electrode terminal 232 by circumferentially covering the outer circumference of the electrode terminal 232. In other embodiments, the connector 233 can also clamp the electrode terminal 232 in other ways, for example, the connector 233 includes two clamping parts arranged opposite to each other, and the two clamping parts are respectively clamped on both sides of the electrode terminal 232 in the radial direction (the direction perpendicular to the thickness direction Z of the end cover 231), so as to clamp and fix the electrode terminal 232 by the connector 233. Of course, the connector 233 can also be fixed to the electrode terminal 232 in a non-clamping manner, for example, the connector 233 and the electrode terminal 232 are connected and fixed by screws, bolts, pins, etc.

[0208] Please refer to Fig. 20 , Fig. 20 A flowchart of a method for manufacturing a battery cell 20 provided in some embodiments of the present application, the method comprising:

[0209] S100: providing a housing 21, wherein the housing 21 has an opening 211;

[0210] S200: Providing an electrode assembly 22;

[0211] S300: providing an end cap assembly 23, the end cap assembly 23 comprising an end cap 231, an electrode terminal 232 and a connector 233, the end cap 231 being provided with an electrode lead-out hole 2311, the electrode lead-out hole 2311 penetrating the end cap 231 in a thickness direction Z of the end cap 231, the electrode terminal 232 being used for being electrically connected to the electrode assembly 22, the connector 233 being used for connecting the end cap 231 to fix the electrode terminal 232, wherein the electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, and a projection of the electrode terminal 232 in the thickness direction Z of the end cap 231 does not overlap with a projection of the end cap 231 in the thickness direction Z;

[0212] S400: accommodating the electrode assembly 22 in the housing 21;

[0213] S500 : sealing the end cap 231 to the opening 211 of the housing 21 , and electrically connecting the electrode terminal 232 to the electrode assembly 22 .

[0214] In the above method, the order of step S100, step S200 and step S300 is not limited. For example, step S300 may be performed first, then step S200, and then step S100.

[0215] The relevant structure of the battery cell 20 manufactured by the above method can refer to the battery cell 20 provided in the above embodiments, and the electrode assembly 22 in the battery cell 20 can refer to the electrode assembly 22 provided in the above embodiments.

[0216] Please refer to Fig.21 , Fig.21 This is a schematic block diagram of a battery cell 20 manufacturing device 2000 provided in some embodiments of the present application. The embodiments of the present application also provide a battery cell 20 manufacturing device 2000, and the manufacturing device 2000 includes a first providing device 2100, a second providing device 2200, a third providing device 2300 and an assembling device 2400.

[0217] The first providing device 2100 is used to provide a housing 21, and the housing 21 has an opening 211. The second providing device 2200 is used to provide an electrode assembly 22. The third providing device 2300 is used to provide an end cap assembly 23, and the end cap assembly 23 includes an end cap 231, an electrode terminal 232 and a connector 233, the end cap 231 is provided with an electrode lead-out hole 2311, and the electrode lead-out hole 2311 penetrates the end cap 231 in the thickness direction Z of the end cap 231, the electrode terminal 232 is used to be electrically connected to the electrode assembly 22, and the connector 233 is used to connect the end cap 231 to fix the electrode terminal 232, wherein the electrode terminal 232 is arranged opposite to the electrode lead-out hole 2311, and the projection of the electrode terminal 232 in the thickness direction Z of the end cap 231 does not overlap with the projection of the end cap 231 in the thickness direction Z. The assembling device 2400 is used to accommodate the electrode assembly 22 in the housing 21, and seal the end cap 231 on the opening 211. The electrode terminal 232 is electrically connected to the electrode assembly 22 .

[0218] The relevant structure of the battery cell 20 manufactured by the above-mentioned manufacturing equipment 2000 can refer to the battery cell 20 provided in the above-mentioned embodiments, and the electrode assembly 22 in the battery cell 20 can refer to the electrode assembly 22 provided in the above-mentioned embodiments.

[0219] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0220] The above embodiments are only used to illustrate the technical solutions of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An end cap assembly for a battery cell, wherein the battery cell includes an electrode assembly, wherein: The end cap assembly comprises: An end cap, wherein the end cap is provided with an electrode lead-out hole, and the electrode lead-out hole penetrates the end cap in a thickness direction of the end cap; an electrode terminal, the electrode terminal being used to be electrically connected to the electrode assembly; A connector, the connector being used to connect the end cover to fix the electrode terminal; The electrode terminal is arranged opposite to the electrode lead-out hole, and a projection of the electrode terminal in the thickness direction does not overlap with a projection of the end cover in the thickness direction.

2. The end cap assembly according to claim 1, wherein: The connecting member clamps the electrode terminal so that the electrode terminal is fixed to the connecting member.

3. The end cap assembly according to claim 2, wherein: The connecting member is circumferentially covered on the outer periphery of the electrode terminal so that the connecting member clamps the electrode terminal.

4. The end cap assembly according to claim 1, wherein: The connecting member includes a surrounding body, a first limiting portion and a second limiting portion; The first limiting portion and the second limiting portion are both provided on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the first limiting portion and the second limiting portion are arranged at intervals in the thickness direction, the enclosure, the first limiting portion and the second limiting portion jointly define a accommodating space, and the electrode terminal is at least partially located in the accommodating space.

5. The end cap assembly according to claim 4, wherein: The electrode terminal comprises a main body and a protruding portion; The main body is used to be electrically connected to the electrode assembly, and the protrusion is connected to the main body and extends into the accommodation space along a direction perpendicular to the thickness direction.

6. The end cap assembly according to claim 5, wherein: The first limiting portion is closer to the electrode assembly than the second limiting portion. The inner side wall of the second limiting portion defines a through hole. The main body passes through the through hole along the thickness direction and extends to the outside of the connecting member.

7. The end cap assembly according to claim 4, wherein: The electrode terminal abuts against the first limiting portion and the second limiting portion to limit the movement of the electrode terminal relative to the connecting member along the thickness direction.

8. The end cap assembly according to claim 1, wherein: The connecting piece is sealed and connected to the end cover.

9. The end cap assembly according to claim 1, wherein: The connecting member is at least partially inserted into the electrode lead-out hole.

10. The end cap assembly of claim 1, wherein: The electrode terminal is at least partially inserted into the electrode lead-out hole.

11. The end cap assembly of claim 1, wherein: The end cover has a first end surface and a second end surface arranged opposite to each other in the thickness direction, and the first end surface is closer to the electrode assembly than the second end surface; Along the direction from the second end face to the first end face, the connecting member does not extend beyond the first end face.

12. The end cap assembly according to claim 11, wherein: The connecting member has a third end surface and a fourth end surface which are arranged opposite to each other in the thickness direction; The third end surface is flush with the first end surface, and the second end surface is located between the third end surface and the fourth end surface in the thickness direction.

13. The end cap assembly of claim 1, wherein: An abutting portion is provided on the outer side wall of the connecting member, and the abutting portion is used to abut against the end cover in the thickness direction.

14. The end cap assembly of claim 13, wherein: The end cover is provided with a receiving groove for receiving the abutting portion.

15. The end cap assembly of claim 14, wherein: The abutting portion is arranged along the circumferential direction of the outer side wall of the connecting member, and the accommodating groove is arranged around the electrode lead-out hole.

16. The end cap assembly of claim 14, wherein: The end cover has a first end surface and a second end surface arranged opposite to each other in the thickness direction, and the first end surface is closer to the electrode assembly than the second end surface; The accommodating groove is disposed on the first end surface or the second end surface.

17. The end cap assembly of claim 16, wherein: The abutting portion has a welding surface for welding with the end cover; The accommodating groove is formed on the first end surface, and the welding surface is flush with the first end surface; or, the accommodating groove is formed on the second end surface, and the welding surface is flush with the second end surface.

18. The end cap assembly according to any one of claims 1 to 17, wherein: The end cap assembly also includes a barrier member; An accommodation gap is formed between the inner contour of the connecting member and the outer contour of the electrode terminal, and the blocking member is at least partially disposed in the accommodation gap to prevent the electrode terminal from contacting the connecting member.

19. The end cap assembly of claim 18, wherein: The barrier member includes a sealing portion; The sealing portion is at least partially located in the accommodating gap to achieve a sealed connection between the electrode terminal and the connecting member.

20. The end cap assembly of claim 18, wherein: The barrier member includes an insulating portion; The insulating portion is at least partially located in the accommodating gap to achieve insulation isolation between the electrode terminal and the connecting member.

21. The end cap assembly of claim 18, wherein: The barrier member includes a conductive portion; The conductive portion is at least partially located in the accommodating gap to achieve electrical connection between the electrode terminal and the connecting member.

22. The end cap assembly of claim 18, wherein: A portion of the connecting member is inserted into the electrode lead-out hole, and a portion of the connecting member is located outside the electrode lead-out hole; A portion of the barrier member covers a portion of the connector that is located outside the electrode lead-out hole.

23. The end cap assembly of claim 18, wherein: The connecting member includes a surrounding body and a first limiting portion; The first limiting portion is provided on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the electrode terminal is at least partially located within the enclosure, the first limiting portion and the electrode terminal form a first gap, the enclosure and the electrode terminal form a second gap connected to the first gap, the first gap and the second gap both form part of the accommodating gap, a portion of the barrier is located within the first gap, and a portion of the barrier is located within the second gap.

24. The end cap assembly of claim 23, wherein: The connecting member further comprises a second limiting portion spaced apart from the first limiting portion in the thickness direction of the end cover; The second limiting portion is provided on the inner side wall of the enclosure and arranged along the circumference of the enclosure, the second limiting portion and the electrode terminal form a third gap connected to the second gap, the third gap forms a part of the accommodating gap, and a part of the blocking member is located in the third gap.

25. A battery cell, comprising: a housing having an opening; an electrode assembly, contained in the housing; as well as According to the end cap assembly according to any one of claims 1-24, the end cap is configured to seal the opening, and the electrode terminal is configured to be electrically connected to the electrode assembly.

26. A battery comprising: Box; as well as The battery cell according to claim 25, wherein the battery cell is accommodated in the box body.

27. An electrical device comprising the battery cell according to claim 25.

28. A method for manufacturing a battery cell, comprising: providing a housing having an opening; providing an electrode assembly; An end cap assembly is provided, the end cap assembly comprising: An end cap, wherein the end cap is provided with an electrode lead-out hole, and the electrode lead-out hole penetrates the end cap in a thickness direction of the end cap; an electrode terminal, the electrode terminal being used to be electrically connected to the electrode assembly; A connector, the connector being used to connect the end cover to fix the electrode terminal; Wherein, the electrode terminal is arranged opposite to the electrode lead-out hole, and the projection of the electrode terminal in the thickness direction does not overlap with the projection of the end cover in the thickness direction; accommodating the electrode assembly in the housing; The end cap is sealed on the opening, and the electrode terminal is electrically connected to the electrode assembly.

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