Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device. The battery cell comprises a casing, an electrode terminal, and a sealing member. The casing comprises a first wall, and the first wall is provided with a first through hole. The electrode terminal is provided on the first wall, and the electrode terminal comprises a first portion, a second portion, and a third portion sequentially connected in the thickness direction of the first wall. At least a part of the first portion is located in the first through hole, and the second portion and the third portion are located on the side of the first wall facing away from the interior of the battery cell. In the radial direction of the electrode terminal, the second portion protrudes beyond the outer peripheral surface of the first portion and the outer peripheral surface of the third portion. In the thickness direction of the first wall, at least a part of the sealing member is located between the second portion and the first wall, and in the thickness direction of the first wall, the projection of the sealing member partially overlaps the projection of the third portion. The structure can improve the reliability of the battery cell.

Description

Battery cells, batteries and electrical equipment CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese patent application CN202420685663.0, entitled “Battery Cell, Battery and Electrical Equipment”, filed on April 3, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0004] During the manufacturing process of batteries, battery reliability is an issue that cannot be ignored. Therefore, how to improve battery reliability is a technical problem that needs to be solved urgently in battery technology. Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide a battery cell comprising a housing, an electrode terminal, and a seal. The housing comprises a first wall having a first through-hole; the electrode terminal is disposed on the first wall, and the electrode terminal comprises a first portion, a second portion, and a third portion sequentially connected along the thickness direction of the first wall. At least a portion of the first portion is located within the first through-hole, and the second portion and the third portion are located on a side of the first wall facing away from the interior of the battery cell. In a radial direction of the electrode terminal, the second portion protrudes beyond the outer circumference of the first portion and the outer circumference of the third portion. In the thickness direction of the first wall, at least a portion of the seal is located between the second portion and the first wall, and the projection of the seal partially overlaps with the projection of the third portion along the thickness direction of the first wall.

[0008] According to the battery cell of the embodiment of the present application, along the radial direction of the electrode terminal, the second part protrudes from the outer peripheral surface of the first part and the outer peripheral surface of the third part, thereby making it possible to reduce the radial dimensions of the first part and the third part while meeting the overcurrent requirement, thereby reducing the space occupied; at the same time, the seal is arranged between the second part with a larger radial dimension and the first wall, so that when the radial dimensions of the first part and the third part of the electrode terminal are reduced, the size of the seal between the electrode terminal and the first wall is sufficient, thereby ensuring that the seal has a sufficient effective sealing area and improving the sealing effect between the electrode terminal and the first wall.

[0009] In addition, along the thickness direction of the first wall, the projection of the seal in the thickness direction of the first wall partially overlaps with the projection of the third part in the thickness direction of the first wall, so that the elastic force of the seal after being compressed can be applied not only to the second part, but also to the third part. The second part and the third part can jointly resist the force of the seal acting on the electrode terminal in the thickness direction of the first wall, reduce the risk of deformation of the second part, and improve the reliability of the battery cell.

[0010] According to some embodiments of the present application, the second portion includes a lap portion protruding from an outer circumferential surface of the third portion, and a portion of the sealing member is disposed between the lap portion and the first wall.

[0011] In the above solution, the overlapping portion protrudes from the outer peripheral surface of the first portion, and at least a portion of the sealing member is disposed between the overlapping portion and the first wall, so as to form a better sealing effect between the electrode terminal and the first wall.

[0012] According to some embodiments of the present application, the outer diameter of the second portion is larger than the outer diameter of the first portion and the outer diameter of the third portion, and the outer diameter of the third portion is larger than the outer diameter of the first portion.

[0013] In the above scheme, the outer diameter of the third part and the outer diameter of the first part are both smaller than the outer diameter of the second part, and the outer diameter of the first part is smaller than the outer diameter of the third part. The smaller outer diameter of the first part, on the one hand, is convenient for adapting to first through holes of different diameters and pole ears of different specifications, thereby improving the compatibility of the electrode terminal; on the other hand, it can reduce the radial size of the seal in the electrode terminal, so that the electrode terminal can occupy a smaller space while meeting the overcurrent requirements, so as to reduce the sealing interface and reduce the risk of sealing failure.

[0014] According to some embodiments of the present application, a difference between an outer diameter of the sealing element and an outer diameter of the second portion is greater than 0 mm and less than or equal to 5 mm.

[0015] In the above scheme, on the one hand, along the thickness direction of the first wall, the projection of the seal and the projection of the second part have a larger overlapping area, so as to form a better sealing effect between the electrode terminal and the first wall. On the other hand, it occupies a smaller space in the radial direction of the electrode terminal.

[0016] According to some embodiments of the present application, the seal includes a seal body and a first extension portion. Along the thickness direction of the first wall, the seal body is arranged between the electrode terminal and the first wall. The first extension portion is connected to the seal body. In the radial direction of the electrode terminal, at least a portion of the first extension portion is located between the hole wall of the first through hole and the electrode terminal.

[0017] In the above scheme, the sealing body is arranged between the electrode terminal and the first wall, so that there is a better sealing effect between the electrode terminal and the first wall; at least a part of the first extension portion is located between the hole wall of the first through hole and the electrode terminal, which can improve the sealing effect between the electrode terminal and the hole wall of the first wall.

[0018] According to some embodiments of the present application, in a radial direction of the electrode terminal, a first gap is provided between the first extension portion and a hole wall of the first through hole.

[0019] In the above solution, a first gap is provided between the first extension portion and the hole wall of the first through hole to facilitate accommodating machining errors.

[0020] According to some embodiments of the present application, the battery cell further includes an electrode assembly, a adapter and a first insulating member, the electrode assembly is arranged in the outer shell, and the electrode assembly has a pole ear; the adapter electrically connects the first part with the pole ear; along the thickness direction of the first wall, at least a portion of the first insulating member is arranged between the first wall and the adapter.

[0021] In the above solution, the adapter is used to achieve electrical connection between the first part and the tab, and at least a portion of the first insulating member is disposed between the first wall and the adapter to insulate and isolate the first wall and the adapter.

[0022] According to some embodiments of the present application, the first insulating member includes a first insulating member body and a second extension portion. Along the thickness direction of the first wall, the first insulating member body is arranged between the first wall and the adapter, and the second extension portion is connected to the first insulating member body. In the radial direction of the electrode terminal, at least a portion of the second extension portion is located between the hole wall of the first through hole and the electrode terminal.

[0023] In the above solution, the first insulating member body is used to insulate and isolate the first wall and the adapter, and the second extending portion is used to insulate and isolate the hole wall of the first through hole and the electrode terminal.

[0024] According to some embodiments of the present application, in a radial direction of the electrode terminal, a second gap is provided between the second extension portion and the electrode terminal.

[0025] In the above solution, a second gap is provided between the second extension portion and the electrode terminal. On the one hand, this facilitates accommodating processing errors, and on the other hand, it can reduce the high temperature generated by welding the electrode terminal and the adapter.

[0026] According to some embodiments of the present application, in a radial direction of the electrode terminal, at least a portion of the second extension portion is located between the first extension portion and the electrode terminal.

[0027] In the above solution, at least a portion of the second extension portion is located between the first extension portion and the electrode terminal, so as to facilitate constrained positioning of the first extension portion.

[0028] According to some embodiments of the present application, the battery cell also includes a fixing member, which is ring-shaped and includes a first fixing portion and a second fixing portion connected to each other. The first fixing portion is connected to the first wall, and the first fixing portion fixes the electrode terminal to the first wall through the second fixing portion.

[0029] In the above solution, the fixing member is annular to facilitate cooperation with the electrode terminal; the first fixing portion is connected to the first wall, the second portion is connected to the electrode terminal, and the fixing member is used to fix the electrode terminal to the first wall.

[0030] According to some embodiments of the present application, the second fixing portion is provided with a first limiting portion, and the outer peripheral surface of the third portion is provided with a second limiting portion, and the second limiting portion cooperates with the first limiting portion to limit the circumferential rotation of the electrode terminal relative to the fixing member.

[0031] In the above solution, the first limiting portion cooperates with the second limiting portion to limit the circumferential rotation of the electrode terminal relative to the fixing member, thereby facilitating the assembly of the fixing member and the electrode terminal.

[0032] According to some embodiments of the present application, the first limiting portion is a first groove, the second limiting portion is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

[0033] In the above solution, at least a portion of the first protrusion is embedded in the first groove, which has a good anti-rotation effect, a simple structure, and is easy to process and manufacture.

[0034] According to some embodiments of the present application, the outer diameter of the second portion is greater than the outer diameter of the third portion, and a first step surface is formed between the second portion and the third portion; along the thickness direction of the first wall, the first protrusion extends to the first step surface.

[0035] In the above solution, the first protrusion extends to the first step surface, which can enhance the strength of the connection between the third portion and the second portion, thereby improving the strength of the electrode terminal.

[0036] According to some embodiments of the present application, along the thickness direction of the first wall, a projection of the first protrusion at least partially overlaps with a projection of the sealing member.

[0037] In the above solution, the projection of the first protrusion at least partially overlaps with the projection of the seal. The area where the first protrusion is located has high strength and can resist the force of the seal acting on the area, thereby increasing the service life of the electrode terminal.

[0038] According to some embodiments of the present application, the first wall includes a main body and a convex portion, the convex portion protrudes from the inner surface of the main body, and a concave portion is formed on the outer surface of the first wall at a position corresponding to the convex portion; the convex portion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connects the bottom wall and the main body, the bottom wall is provided with a first through hole, and a portion of the electrode terminal is provided in the concave portion.

[0039] In the above scheme, the convex portion protrudes from the inner surface of the main body, and a part of the electrode terminal is arranged in the concave portion, so that the electrode terminal is arranged toward the interior of the battery cell, reducing the height of the electrode terminal protruding from the outer surface of the first wall, reducing the overall height of the battery cell, and facilitating the improvement of the energy density of the battery cell.

[0040] According to some embodiments of the present application, the battery cell also includes an electrode assembly and an adapter, the electrode assembly is arranged in the outer shell, and the electrode assembly has a pole ear; the adapter electrically connects the electrode terminal and the pole ear; the adapter includes a first connecting portion connected to the pole ear, the first connecting portion is located on the side of the protrusion in the first direction, along the first direction, the projection of the first connecting portion at least partially overlaps with the projection of the protrusion, and the first direction is perpendicular to the thickness direction of the main body.

[0041] In the above solution, the first connecting portion is located on the side of the protrusion in the first direction. By rationally utilizing the space on the side of the protrusion in the first direction, the distance between the tab and the first wall can be shortened, thereby improving the utilization rate of the internal space of the battery cell and increasing the energy density of the battery cell.

[0042] According to some embodiments of the present application, along the first direction, a projection of the first connection portion at least partially overlaps with a projection of the electrode terminal.

[0043] In the above solution, the projection of the first connecting portion at least partially overlaps with the projection of the electrode terminal, further reducing the distance between the tab and the first wall in the thickness direction of the first wall, improving the internal space utilization of the battery cell, and improving the energy density of the battery cell.

[0044] In a second aspect, an embodiment of the present application further provides a battery, which includes a battery cell provided in any of the above embodiments.

[0045] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell or battery as provided in any of the above embodiments, and the battery cell or battery is used to provide electrical energy.

[0046] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0048] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0049] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0050] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0051] FIG4 is a schematic diagram of the assembly of the electrode terminal and the first wall provided in some embodiments of the present application;

[0052] FIG5 is a schematic diagram of the assembly of an electrode terminal, a sealing member, and a first wall according to some embodiments of the present application;

[0053] FIG6 is a partial enlarged view of point A in FIG5 ;

[0054] FIG7 is a schematic structural diagram of a connector provided in some embodiments of the present application;

[0055] FIG8 is a schematic structural diagram of a second insulating member provided in some embodiments of the present application;

[0056] FIG9 is a schematic structural diagram of electrode terminals provided in some embodiments of the present application;

[0057] FIG10 is a cross-sectional view taken along the BB direction of FIG4 ;

[0058] FIG11 is a partial enlarged view of point C in FIG10 ;

[0059] In the drawings, the drawings are not drawn to scale.

[0060] Marking instructions: 100 - battery; 10 - housing; 11 - first sub-housing; 12 - second sub-housing; 20 - battery cell; 21 - housing; 211 - housing; 212 - end cap; 213 - first wall; 2131 - first through hole; 2132 - body; 2133 - convex portion; 2134 - concave portion; 2135 - bottom wall; 2136 - peripheral wall; 22 - electrode assembly; 221 - tab; 221a - positive tab; 221b - negative tab; 23 - electrode terminal; 23a - positive electrode terminal; 23b - negative electrode terminal; 231 - first portion; 232 - second portion; 233 - third portion; 234 - overlapping portion; 235 - second limiting portion; 236 - first step surface; 24 - seal; 241 - seal body; 242 -first extension portion; 243-second through hole; 25-adapter; 25a-positive electrode adapter; 25b-negative electrode adapter; 251-first connecting portion; 26-first insulating member; 261-first insulating member body; 262-second extension portion; 263-third through hole; 27-fixing member; 27a-first fixing portion; 27b-second fixing portion; 271-connecting member; 272-second insulating member; 273-first limiting portion; 274-third limiting portion; 275-fourth limiting portion; 276-first welding portion; F1-first dividing line; F2-second dividing line; P1-first gap; P2-second gap; J-radial direction of electrode terminal; X-first direction; Z-thickness direction of first wall; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0061] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. 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" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0063] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0065] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0066] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0067] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0068] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0069] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0070] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0071] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0072] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0073] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium can be used.

[0080] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0081] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0083] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0086] In some embodiments, the electrode assembly is a laminate structure.

[0087] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, or a composite metal housing (e.g., a copper-aluminum composite housing).

[0088] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0089] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0090] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0091] As an example, the battery cell may be a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery.

[0092] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0093] In some embodiments, a battery cell includes a housing and an electrode terminal. The housing includes a first wall, and the electrode terminal is disposed on the first wall. The electrode terminal includes a first segment and a second segment connected along the thickness direction of the first wall. The first segment and the second segment are both located on the side of the first wall facing away from the interior of the battery cell. The outer diameter of the second segment is smaller than the outer diameter of the first segment. In the radial direction of the electrode terminal, the first segment protrudes from the outer circumference of the second segment. When the electrode terminal is assembled with the first wall, a first seal is disposed between the first segment and the first wall along the thickness direction of the first wall. To ensure a sufficient sealing area for the first seal, the radial dimension of the first segment needs to be increased so that the portion of the first segment protruding from the second segment is sufficient to press the larger first seal against the first wall. However, this results in a larger overall size of the electrode terminal, thereby occupying a larger assembly space. If the radial dimension of the electrode terminal is reduced, the portion of the first segment protruding from the second segment can only press the smaller first seal against the first wall, resulting in a weaker sealing effect between the electrode terminal and the first wall, which can easily lead to failure of the sealing interface between the electrode terminal and the first wall, resulting in lower reliability of the battery cell.

[0094] In view of this, and to address the problem of poor sealing between the electrode terminal and the first wall, which leads to low reliability of the battery cell, the present application provides a technical solution. The battery cell includes a housing, an electrode terminal, and a sealing member. The housing includes a first wall, which is provided with a first through-hole; the electrode terminal is disposed on the first wall, and the electrode terminal includes a first portion, a second portion, and a third portion connected sequentially along the thickness direction of the first wall. At least a portion of the first portion is located within the first through-hole, and the second portion and the third portion are located on the side of the first wall facing away from the interior of the battery cell. In the radial direction of the electrode terminal, the second portion protrudes from the outer circumference of the first portion and the outer circumference of the third portion. In the thickness direction of the first wall, at least a portion of the sealing member is located between the second portion and the first wall, and the projection of the sealing member partially overlaps with the projection of the third portion along the thickness direction of the first wall. This battery cell has high reliability.

[0095] In such a battery cell, the second portion protrudes radially from the outer circumference of the first portion and the outer circumference of the third portion along the radial direction of the electrode terminal. This allows the radial dimensions of the first and third portions to be reduced while meeting overflow requirements, thereby reducing space usage. Furthermore, the seal is disposed between the second portion (which has a larger radial dimension) and the first wall. This ensures that the seal between the electrode terminal and the first wall is sufficiently sized even when the radial dimensions of the first and third portions are reduced, ensuring a sufficient effective sealing area for the seal and improving the sealing effect between the electrode terminal and the first wall. Furthermore, along the thickness direction of the first wall, the third portion and the second portion have a large overlapping area. At least a portion of the seal is located between the second portion and the first wall, and the projection of the seal partially overlaps with the projection of the third portion. Consequently, the elastic force of the seal under pressure is applied not only to the second portion but also to the third portion. The second and third portions can jointly resist the force exerted by the seal on the electrode terminal in the thickness direction of the first wall, reducing the risk of deformation of the second portion and thereby improving the reliability of the battery cell.

[0096] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical equipment.

[0097] The embodiments of the present application provide an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0098] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0099] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0100] The vehicle 1000 may further include a controller 200 and a motor 300 . 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 the vehicle 1000 during startup, navigation, and driving.

[0101] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to Figure 2, which is an exploded schematic diagram of a battery provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 being housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first sub-housing 11 and a second sub-housing 12, the first sub-housing 11 and the second sub-housing 12 covering each other, and the first sub-housing 11 and the second sub-housing 12 jointly defining a storage space for accommodating the battery cell 20. The second sub-housing 12 can be a hollow structure with one end open, and the first sub-housing 11 can be a plate-shaped structure, with the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define a storage space; the first sub-housing 11 and the second sub-housing 12 can also be hollow structures with one end open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0103] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0104] The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0105] Please refer to Figure 3, which is an exploded schematic diagram of a battery cell provided in some embodiments of the present application. As shown in Figure 3, a battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23. Housing 21 includes a shell 211 and an end cap 212. Shell 211 has an opening, and end cap 212 closes the opening, isolating the internal environment of battery cell 20 from the external environment.

[0106] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can be of various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The housing 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0107] The end cap 212 is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211 to fit the housing 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 212 from deforming when subjected to compression or collision, thereby providing the battery cell 20 with greater structural strength and improved reliability. Functional components such as electrode terminals 23 can be provided on the end cap 212. The electrode terminals can be used to electrically connect to the electrode assembly 22 to output or input electrical energy to the battery cell 20. The end cap 212 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in the present embodiment. In some embodiments, an insulating structure can be provided on the inner side of the end cap 212 to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be plastic, rubber, or the like.

[0108] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 211. The electrode assembly 22 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body.

[0109] Please refer to Figure 3 and further to Figures 4 to 6. Figure 4 is a schematic diagram of the assembly of an electrode terminal and a first wall according to some embodiments of the present application. Figure 5 is a schematic diagram of the assembly of an electrode terminal, a seal, and the first wall according to some embodiments of the present application. Figure 6 is a partial enlarged view of point A in Figure 5. Embodiments of the present application provide a battery cell 20 comprising a housing 21, an electrode terminal 23, and a seal 24. The housing 21 includes a first wall 213, which is provided with a first through-hole 2131. The electrode terminal 23 is disposed on the first wall 213 and comprises a first portion 231, a second portion 232, and a third portion 233, which are sequentially connected along the thickness direction Z of the first wall. At least a portion of the first portion 231 is located within the first through-hole 2131. The second portion 232 and the third portion 233 are located on a side of the first wall 213 facing away from the interior of the battery cell 20. Along the radial direction J of the electrode terminal, the second portion 232 protrudes from the outer circumference of the first portion 231 and the outer circumference of the third portion 233. At least a portion of the seal 24 is located between the second portion 232 and the first wall 213 along the thickness direction Z of the first wall. A projection of the seal 24 partially overlaps with a projection of the third portion 233 along the thickness direction Z of the first wall.

[0110] The first wall 213 may be the end cover 212 , or the first wall 213 may be a wall portion of the housing 211 .

[0111] The first portion 231 , the second portion 232 and the third portion 233 are sequentially distributed along the thickness direction Z of the first wall. The first portion 231 is closer to the interior of the battery cell 20 than the third portion 233 .

[0112] To facilitate the distinction between the first portion 231 and the second portion 232 and the second portion 232 and the third portion 233 , the first dividing line F1 in FIG. 6 is the dividing line between the first portion 231 and the second portion 232 , and the second dividing line F2 is the dividing line between the second portion 232 and the third portion 233 .

[0113] At least a portion of the first portion 231 is located within the first through hole 2131 to facilitate electrical connection between the first portion 231 and the tab. For example, when the battery cell 20 further includes a transition piece, the transition piece electrically connects the first portion 231 and the tab of the electrode assembly.

[0114] The electrode terminal 23 may include a positive electrode terminal 23 a and a negative electrode terminal 23 b . The first wall 213 is provided with two first through holes 2131 , which correspond to the positive electrode terminal 23 a and the negative electrode terminal 23 b , respectively.

[0115] “At least part of the seal 24 is located between the second part 232 and the first wall 213 along the thickness direction Z of the first wall” can mean that, along the thickness direction Z of the first wall, the projection of a part of the seal 24 overlaps with the projection of the overlapping area of ​​the second part 232 and the third part 233, and the projection of a part of the seal 24 overlaps with the projection of the part of the second part 232 protruding from the outer peripheral surface of the third part 233.

[0116] The radial direction J of the electrode terminal is perpendicular to the thickness direction Z of the first wall. In some embodiments, the electrode terminal 23 can be cylindrical. In other embodiments, the electrode terminal 23 can be non-cylindrical, and the radial direction of the circumscribed circle of the electrode terminal 23 is the radial direction J of the electrode terminal.

[0117] In some embodiments, along the thickness direction Z of the first wall, the projection of the third portion 233 partially overlaps with the first wall 213, and the sealant 24 is located between the third portion 233 and the first wall 213, thereby forming a seal between the third portion 233 and the first wall 213. Because the second portion 232 protrudes from the outer circumference of the third portion 233, the third portion 233 and the second portion 232 have an overlapping area, which has high strength. The sealant 24 is located in this overlapping area, and the third portion 233 can resist the force applied by the sealant 24 to the overlapping area, thereby achieving a good sealing effect between the electrode terminal 23 and the first wall 213.

[0118] In some embodiments, the seal 24 is annular and is disposed outside the first portion 231 , and at least a portion of the seal 24 is disposed outside the first through hole 2131 to form a sealed fit between the electrode terminal 23 and the first wall 213 .

[0119] According to the battery cell 20 of the embodiment of the present application, along the radial direction J of the electrode terminal, the second part 232 protrudes from the outer peripheral surface of the first part 231 and the outer peripheral surface of the third part 233, thereby making it possible to reduce the radial dimensions of the first part 231 and the third part 233 while meeting the overcurrent requirement, thereby reducing the space occupied; at the same time, the seal 24 is arranged between the second part 232 with a larger radial dimension and the first wall 213, so that when the radial dimensions of the first part 231 and the third part 233 of the electrode terminal 23 are reduced, the size of the seal 24 between the electrode terminal 23 and the first wall 213 is sufficient, thereby ensuring that the seal 24 has a sufficient effective sealing area, thereby improving the sealing effect between the electrode terminal 23 and the first wall 213.

[0120] In addition, along the thickness direction Z of the first wall, the projection of the seal 24 in the thickness direction Z of the first wall partially overlaps with the projection of the third part 233 in the thickness direction Z of the first wall, so that the elastic force of the seal 24 after being compressed can be applied not only to the second part 232, but also to the third part 233. The second part 232 and the third part 233 can jointly resist the force of the seal 24 acting on the electrode terminal 23 in the thickness direction Z of the first wall, reduce the risk of deformation of the second part 232, and improve the reliability of the battery cell 20.

[0121] 5 and 6 , according to some embodiments of the present application, the second portion 232 includes a lap portion 234 protruding from the outer circumference of the third portion 233 , and a portion of the seal 24 is disposed between the lap portion 234 and the first wall 213 .

[0122] The overlapping portion 234 is the portion of the second portion 232 that protrudes from the outer circumferential surface of the third portion 233 in the radial direction J of the electrode terminal. Along the thickness direction Z of the first wall, a portion of the projection of the sealing member 24 overlaps with the projection of the overlapping portion 234 and the projection of the first wall 213. In other words, a portion of the sealing member 24 is clamped between the overlapping portion 234 and the first wall 213, thereby forming a sealed fit between the overlapping portion 234 and the first wall 213.

[0123] In the above solution, the overlapping portion 234 protrudes from the outer circumference of the third portion 233 , and at least a portion of the seal 24 is disposed between the overlapping portion 234 and the first wall 213 , so as to form a better sealing effect between the electrode terminal 23 and the first wall 213 .

[0124] 5 , according to some embodiments of the present application, the outer diameter of the second portion 232 is larger than the outer diameters of the first portion 231 and the third portion 233 , and the outer diameter of the third portion 233 is larger than the outer diameter of the first portion 231 .

[0125] The outer diameter of the first part 231 is smaller than the outer diameter of the third part 233, so that the outer diameter of the second part 232 can be smaller, so as to reduce the radial size of the seal 24 in the electrode terminal 23, thereby reducing the sealing interface between the electrode terminal 23 and the first wall 213, thereby reducing the risk of sealing failure.

[0126] In the above scheme, the outer diameter of the third part 233 and the outer diameter of the first part 231 are both smaller than the outer diameter of the second part 232, and the outer diameter of the first part 231 is smaller than the outer diameter of the third part 233. The smaller outer diameter of the first part 231, on the one hand, is convenient for adapting to first through holes 2131 of different diameters and pole ears of different specifications, thereby improving the compatibility of the electrode terminal 23; on the other hand, it can reduce the size of the seal 24 in the radial direction J of the electrode terminal, so that the electrode terminal 23 can occupy a smaller space while meeting the overcurrent requirements, so as to reduce the sealing interface and reduce the risk of sealing failure.

[0127] According to some embodiments of the present application, a difference between an outer diameter of the sealing element 24 and an outer diameter of the second portion 232 is greater than 0 mm and less than or equal to 5 mm.

[0128] In some embodiments, the difference between the outer diameter of the seal 24 and the outer diameter of the second portion 232 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or any value between any two points.

[0129] In the above scheme, the difference between the outer diameter of the seal 24 and the outer diameter of the second part 232 satisfies the above relationship. On the one hand, along the thickness direction Z of the first wall, the projection of the seal 24 and the projection of the second part 232 have a larger overlapping area, so as to form a better sealing effect between the electrode terminal 23 and the first wall 213. On the other hand, a smaller space is occupied in the radial direction J of the electrode terminal.

[0130] Please refer to Figures 5 and 6. According to some embodiments of the present application, the seal 24 includes a seal body 241 and a first extension portion 242. Along the thickness direction Z of the first wall, the seal body 241 is arranged between the electrode terminal 23 and the first wall 213. The first extension portion 242 is connected to the seal body 241. In the radial direction J of the electrode terminal, at least a portion of the first extension portion 242 is located between the hole wall of the first through hole 2131 and the electrode terminal 23.

[0131] The sealing member body 241 is provided with a second through hole 243 corresponding to the first through hole 2131 . The first extension portion 242 is provided around the second through hole 243 and extends into the first through hole 2131 .

[0132] The first extension portion 242 is connected to the sealing body 241 . The first extension portion 242 and the sealing body 241 may be integrally formed, or the first extension portion 242 and the sealing body 241 may be connected by thermal melting.

[0133] In the above scheme, the sealing body 241 is arranged between the electrode terminal 23 and the first wall 213, so that there is a better sealing effect between the electrode terminal 23 and the first wall 213; at least a part of the first extension portion 242 is located between the hole wall of the first through hole 2131 and the electrode terminal 23, which can improve the sealing effect between the electrode terminal 23 and the hole wall of the first wall 213.

[0134] 5 and 6 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, a first gap P1 is defined between the first extension portion 242 and the wall of the first through hole 2131 .

[0135] In the radial direction J of the electrode terminal, the outer peripheral surface of the first extension portion 242 does not contact the hole wall of the first through hole 2131 .

[0136] In the above solution, a first gap P1 is provided between the first extension portion 242 and the wall of the first through hole 2131 to accommodate machining errors.

[0137] Please refer to Figures 5 and 6. According to some embodiments of the present application, the battery cell 20 also includes an electrode assembly 22, an adapter 25 and a first insulating member 26. The electrode assembly 22 is arranged in the outer shell 21, and the electrode assembly 22 has a pole ear 221; the adapter 25 electrically connects the first part 231 and the pole ear 221; along the thickness direction Z of the first wall, at least a portion of the first insulating member 26 is arranged between the first wall 213 and the adapter 25.

[0138] The adapter 25 is used to achieve electrical connection between the first portion 231 and the tab 221 . The adapter 25 may be a conductive metal member. The material of the adapter 25 may be copper, iron, aluminum, or alloys thereof.

[0139] In some embodiments, the first part 231 and the tab 221 are respectively welded to the adapter 25, which on the one hand makes the current flow capacity between the first part 231 and the tab 221 stronger, and on the other hand makes the connection between the first part 231 and the adapter 25, and the tab 221 and the adapter 25 firm.

[0140] Please refer to Figure 3, the tab 221 includes a positive tab 221a and a negative tab 221b, the adapter 25 may include a positive adapter 25a and a negative adapter 25b, the electrode terminal 23 includes a positive electrode terminal 23a and a negative electrode terminal 23b, the positive tab 221a and the positive electrode terminal 23a are electrically connected through the positive adapter 25a, and the negative tab 221b and the negative electrode terminal 23b are electrically connected through the negative adapter 25b.

[0141] The first insulating member 26 is an insulating structure for insulating and isolating the first wall 213 and the adapter 25 . The first insulating member 26 can be bonded to the side of the first wall 213 facing the electrode assembly 22 to facilitate assembly and positioning of the first insulating member 26 .

[0142] In the above solution, the adapter 25 is used to achieve electrical connection between the first portion 231 and the tab 221 , and at least a portion of the first insulating member 26 is disposed between the first wall 213 and the adapter 25 to insulate and isolate the first wall 213 and the adapter 25 .

[0143] Please refer to Figures 5 and 6. According to some embodiments of the present application, the first insulating member 26 includes a first insulating member body 261 and a second extension portion 262. Along the thickness direction Z of the first wall, the first insulating member body 261 is arranged between the first wall 213 and the adapter 25, and the second extension portion 262 is connected to the first insulating member body 261. In the radial direction J of the electrode terminal, at least a portion of the second extension portion 262 is located between the hole wall of the first through hole 2131 and the electrode terminal 23.

[0144] The first insulating body 261 defines a third through hole 263 corresponding to the first through hole 2131 . The second extending portion 262 surrounds the third through hole 263 and extends into the first through hole 2131 .

[0145] In the above solution, the first insulating member body 261 is used to insulate and isolate the first wall 213 and the adapter 25 , and the second extending portion 262 is used to insulate and isolate the hole wall of the first through hole 2131 and the electrode terminal 23 .

[0146] 5 and 6 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, a second gap P2 is defined between the second extension portion 262 and the electrode terminal 23 .

[0147] In the radial direction J of the electrode terminal, the inner circumferential surface of the second extension portion 262 does not contact the outer circumferential surface of the first portion 231 .

[0148] In the above solution, a second gap P2 is provided between the second extension portion 262 and the electrode terminal 23 , which, on the one hand, facilitates accommodating processing errors, and on the other hand, can reduce the high temperature generated by welding the electrode terminal 23 and the adapter 25 .

[0149] 5 and 6 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, at least a portion of the second extension portion 262 is located between the first extension portion 242 and the electrode terminal 23 .

[0150] In some embodiments, along the radial direction J of the electrode terminal, a projection of the second extension portion 262 partially overlaps with a projection of the first extension portion 242 .

[0151] In some embodiments, an outer circumferential surface of the second extension portion 262 may contact an inner circumferential surface of the first extension portion 242 .

[0152] In the above solution, at least a portion of the second extension portion 262 is located between the first extension portion 242 and the electrode terminal 23 , so as to facilitate constrained positioning of the first extension portion 242 .

[0153] Please refer to Figure 5. According to some embodiments of the present application, the battery cell 20 also includes a fixing member 27. The fixing member 27 is annular and includes a first fixing portion 27a and a second fixing portion 27b connected to each other. The first fixing portion 27a is connected to the first wall 213. The first fixing portion 27a fixes the electrode terminal 23 to the first wall 213 through the second fixing portion 27b.

[0154] In some embodiments, the fixing member 27 can be disposed around the third portion 233 .

[0155] In some embodiments, the first fixing portion 27 a is spaced away from the central axis of the electrode terminal 23 relative to the second fixing portion 27 b.

[0156] In the above solution, the fixing member 27 is annular to facilitate cooperation with the electrode terminal 23 ; the first fixing portion 27 a is connected to the first wall 213 , and the second portion 232 is connected to the electrode terminal 23 . The fixing member 27 is used to fix the electrode terminal 23 to the first wall 213 .

[0157] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of the structure of a connector provided in some embodiments of the present application, and Figure 8 is a schematic diagram of the structure of a second insulating member provided in some embodiments of the present application. In some embodiments, the fixing member 27 includes a connector 271 and a second insulating member 272. The connector 271 is sleeved on the outside of the second insulating member 272, and the second insulating member 272 is sleeved on the outside of the electrode terminal 23. The first fixing portion 27a is provided on the connector 271, and the second fixing portion 27b is provided on the second insulating member 272.

[0158] The connecting member 271 may be a metal member. The first fixing portion 27 a is welded to the first wall 213 to form a first welding portion 276 , so that the fixing member 27 is firmly connected to the first wall 213 .

[0159] The second insulating member 272 is used to achieve insulation isolation between the electrode terminal 23 and the connecting member 271 , and further achieve insulation isolation between the electrode terminal 23 and the first wall 213 .

[0160] Please refer to Figures 7 and 8, and further to Figure 9, which is a schematic diagram of the structure of the electrode terminal provided in some embodiments of the present application. According to some embodiments of the present application, the second fixing portion 27b is provided with a first limiting portion 273, and the outer circumferential surface of the third portion 233 is provided with a second limiting portion 235. The second limiting portion 235 cooperates with the first limiting portion 273 to limit the circumferential rotation of the electrode terminal 23 relative to the fixing member 27.

[0161] The first limiting portion 273 and the second limiting portion 235 are mutually cooperating structures, for example, a protrusion and a groove cooperating structure, or a protrusion and a hole cooperating structure, to limit the rotation of the electrode terminal 23 relative to the fixing member 27 in the circumferential direction of the fixing member 27.

[0162] In the above solution, the first limiting portion 273 cooperates with the second limiting portion 235 to limit the circumferential rotation of the electrode terminal 23 relative to the fixing member 27 , thereby facilitating the assembly of the fixing member 27 and the electrode terminal 23 .

[0163] According to some embodiments of the present application, the first limiting portion 273 is a first groove, the second limiting portion 235 is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

[0164] The first limiting portion 273 may be a first groove provided on the inner circumference of the fixing member 27 , and the second limiting portion 235 may be a first protrusion provided on the outer circumference of the third portion 233 .

[0165] In some embodiments, the first limiting portion 273 may be a first groove disposed on the inner circumferential surface of the second insulating member 272 .

[0166] In the above solution, at least a portion of the first protrusion is embedded in the first groove, which has a good anti-rotation effect, a simple structure, and is easy to process and manufacture.

[0167] In some embodiments, the number of first protrusions corresponds to the number of first grooves, and each first protrusion is inserted into a corresponding first groove. The number of first protrusions can be one, two, or more. When there are multiple first protrusions, the multiple first protrusions are spaced apart around the central axis of the electrode terminal 23.

[0168] Please refer to Figures 6 and 9. According to some embodiments of the present application, the outer diameter of the second part 232 is greater than the outer diameter of the third part 233, and a first step surface 236 is formed between the second part 232 and the third part 233; along the thickness direction Z of the first wall, the first protrusion extends to the first step surface 236.

[0169] The first step surface 236 is formed at the connection between the second portion 232 and the third portion 233 , and the first protrusion extends to the first step surface 236 along the thickness direction Z of the first wall, so that the first protrusion is located at the connection between the second portion 232 and the third portion 233 .

[0170] In the above solution, the first protrusion extends to the first step surface 236 , which can enhance the strength of the connection between the third portion 233 and the second portion 232 , thereby improving the strength of the electrode terminal 23 .

[0171] According to some embodiments of the present application, along the thickness direction Z of the first wall, a projection of the first protrusion at least partially overlaps with a projection of the sealing member 24 .

[0172] Viewed along the thickness direction Z of the first wall, the first protrusion at least partially overlaps with the sealing member 24 .

[0173] In the above solution, the projection of the first protrusion at least partially overlaps with the projection of the seal 24 . The area where the first protrusion is located has high strength and can resist the force acting on the area by the seal 24 , thereby increasing the service life of the electrode terminal 23 .

[0174] In an embodiment in which the fixing member 27 includes a connecting member 271 and a second insulating member 272, the connecting member 271 and the second insulating member 272 are both annular, the second insulating member 272 is sleeved on the outside of the electrode terminal 23, and the connecting member 271 is sleeved on the outside of the second insulating member 272. The inner circumference of the connecting member 271 is provided with a third limiting portion 274, and the outer circumference of the second insulating member 272 is provided with a fourth limiting portion 275. The third limiting portion 274 cooperates with the fourth limiting portion 275 to limit the circumferential rotation of the connecting member 271 relative to the second insulating member 272.

[0175] The third limiting portion 274 may be a second groove provided on the inner circumference of the connecting member 271 , and the fourth limiting portion 275 may be a second protrusion provided on the outer circumference of the second insulating member 272 , with at least a portion of the second protrusion embedded in the second groove.

[0176] In some embodiments, along the radial direction J of the electrode terminal, a projection of the second protrusion at least partially overlaps with a projection of the first groove.

[0177] In some embodiments, the number of second protrusions corresponds to the number of second grooves, and each second protrusion is inserted into a corresponding second groove. The number of second protrusions can be one, two, or more. When there are multiple second protrusions, the multiple second protrusions are spaced apart around the central axis of the electrode terminal 23.

[0178] Please refer to Figures 5 and 6, and further to Figures 10 and 11. Figure 10 is a cross-sectional view taken along line BB of Figure 4, and Figure 11 is a partially enlarged view of point C of Figure 10. According to some embodiments of the present application, the first wall 213 includes a main body 2132 and a protrusion 2133. The protrusion 2133 protrudes from the inner surface of the main body 2132. A recess 2134 is formed on the outer surface of the first wall 213 at a position corresponding to the protrusion 2133. The protrusion 2133 includes a bottom wall 2135 and a peripheral wall 2136 surrounding the bottom wall 2135. The peripheral wall 2136 connects the bottom wall 2135 and the main body 2132. The bottom wall 2135 is provided with a first through hole 2131, and a portion of the electrode terminal 23 is disposed within the recess 2134.

[0179] “The convex portion 2133 protrudes from the inner surface of the main body portion 2132, and the outer surface of the first wall 213 has a concave portion 2134 formed at a position corresponding to the convex portion 2133” may be that the first wall 213 is formed with the convex portion 2133 and the concave portion 2134 by stamping, and the concave portion 2134 may be a pit or a groove.

[0180] The inner surface of the bottom wall 2135 and the inner surface of the peripheral wall 2136 form a recessed portion 2134 .

[0181] The thickness direction of the main body 2132 and the thickness direction of the bottom wall 2135 are both parallel to the thickness direction Z of the first wall.

[0182] The bottom wall 2135 is parallel to the thickness direction Z of the first wall.

[0183] The first through hole 2131 penetrates the bottom wall 2135 along the thickness direction Z of the first wall, so that the recess 2134 is in communication with the interior of the battery cell 20 through the first through hole 2131 .

[0184] In some embodiments, the second portion 232 is located within the recess 2134 , and a portion of the third portion 233 is located within the recess 2134 .

[0185] In the above scheme, the protrusion 2133 protrudes from the inner surface of the main body 2132, and a portion of the electrode terminal 23 is arranged in the recess 2134, so that the electrode terminal 23 is arranged toward the interior of the battery cell 20, reducing the height of the electrode terminal 23 protruding from the outer surface of the first wall 213, reducing the overall height of the battery cell 20, and facilitating the improvement of the energy density of the battery cell 20.

[0186] Please refer to Figures 5, 6, 10 and 11. According to some embodiments of the present application, the battery cell 20 also includes an electrode assembly 22 and an adapter 25. The electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 has a pole ear 221; the adapter 25 electrically connects the electrode terminal 23 and the pole ear 221; the adapter 25 includes a first connecting portion 251 connected to the pole ear 221, and the first connecting portion 251 is located on the side of the protrusion 2133 in the first direction X. Along the first direction X, the projection of the first connecting portion 251 at least partially overlaps with the projection of the protrusion 2133, and the first direction X is perpendicular to the thickness direction of the main body 2132.

[0187] The first connection portion 251 is located on the side of the protrusion 2133 in the first direction X, which means that the protrusion 2133 and the first connection portion 251 are spaced apart along the first direction X, that is, along the thickness direction Z of the first wall, the projection of the first connection portion 251 does not overlap with the projection of the protrusion 2133.

[0188] In some embodiments, the first direction X may be parallel to a width direction of the battery cell 20 .

[0189] In some embodiments, along the first direction X, the projection of the first connection portion 251 partially overlaps with the projection of the convex portion 2133 , or, along the first direction X, the projection of the first connection portion 251 completely overlaps with the projection of the convex portion 2133 .

[0190] Along the first direction X, the projection of the first connecting portion 251 at least partially overlaps with the projection of the protrusion 2133. Since the first connecting portion 251 is connected to the pole ear 221, the pole ear 221 can be located on the side of the protrusion 2133 in the first direction X, and the pole ear 221 can be arranged close to the first wall 213 to reasonably utilize the space on the side of the protrusion 2133 in the first direction X.

[0191] In the above solution, the first connecting portion 251 is located on the side of the protrusion 2133 in the first direction X. By rationally utilizing the space on the side of the protrusion 2133 in the first direction X, the distance between the tab 221 and the first wall 213 can be shortened, thereby improving the internal space utilization of the battery cell 20 and increasing the energy density of the battery cell 20.

[0192] According to some embodiments of the present application, along the first direction X, a projection of the first connection portion 251 at least partially overlaps with a projection of the electrode terminal 23 .

[0193] In the above solution, the projection of the first connecting portion 251 at least partially overlaps with the projection of the electrode terminal 23, further reducing the distance between the tab 221 and the first wall 213 in the thickness direction Z of the first wall, improving the internal space utilization of the battery cell 20, and improving the energy density of the battery cell 20.

[0194] According to some embodiments of the present application, the housing 21 includes a shell 211 and an end cover 212 . The shell 211 has an opening, the end cover 212 closes the opening, and the first wall 213 serves as the end cover 212 .

[0195] According to some embodiments of the present application, an embodiment of the present application further provides a battery 100 , which includes a battery cell 20 provided in any of the above embodiments.

[0196] According to some embodiments of the present application, an electrical device is further provided, which includes a battery cell 20 or a battery 100 as provided in any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0197] The electrical equipment may be any of the above-mentioned devices or systems using the battery cell 20 or the battery 100 .

[0198] According to some embodiments of the present application, please refer to Figures 3 to 11. The embodiments of the present application provide a battery cell 20. The battery cell 20 includes a housing 21, an electrode assembly 22, an electrode terminal 23, and a seal 24.

[0199] The housing 21 includes a shell 211 and an end cover 212 . The shell 211 has an opening, and the end cover 212 closes the opening. The first wall 213 serves as the end cover 212 . The electrode terminal 23 is disposed on the first wall 213 .

[0200] The first wall 213 includes a main body 2132 and a protrusion 2133 protruding from an inner surface of the main body 2132 . A recess 2134 is formed on an outer surface of the first wall 213 at a position corresponding to the protrusion 2133 .

[0201] The electrode terminal 23 includes a first portion 231, a second portion 232, and a third portion 233, arranged in sequence along the thickness direction Z of the first wall. The outer diameter of the second portion 232 is larger than the outer diameters of the first portion 231 and the third portion 233, and the outer diameter of the third portion 233 is larger than the outer diameter of the first portion 231. In the radial direction J of the electrode terminal, the second portion 232 protrudes from the outer circumference of the first portion 231 and the outer circumference of the third portion 233. A portion of the first portion 231 is disposed within the first through-hole 2131, the second portion 232 is located within the recess 2134, and a portion of the third portion 233 is located within the recess 2134.

[0202] Along the thickness direction Z of the first wall, a portion of the seal 24 is disposed between the second portion 232 and the first wall 213 .

[0203] Along the thickness direction Z of the first wall, the projection of the seal 24 partially overlaps with the projection of the third portion 233 .

[0204] According to the battery cell 20 of the embodiment of the present application, a portion of the first portion 231 is located within the recess 2134, and the electrode terminal 23 can be positioned toward the interior of the battery cell 20 to reduce the protrusion of the electrode terminal 23 from the outer surface of the first wall 213, thereby improving the energy density of the battery cell 20. The outer diameter of the first portion 231 can be relatively small to improve the compatibility of the electrode terminal 23. At the same time, the dimension of the seal 24 in the radial direction J of the electrode terminal can be reduced, reducing the risk of sealing interface failure and thereby improving the reliability of the battery cell 20.

[0205] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, comprising: The housing comprises a first wall, wherein the first wall is provided with a first through hole; an electrode terminal disposed on the first wall, the electrode terminal comprising a first portion, a second portion, and a third portion sequentially connected along the thickness direction of the first wall, at least a portion of the first portion being located within the first through-hole, the second portion and the third portion being located on a side of the first wall facing away from the interior of the battery cell, and the second portion protruding from outer circumferential surfaces of the first portion and the third portion in a radial direction of the electrode terminal; A sealing member, at least a portion of which is located between the second portion and the first wall along the thickness direction of the first wall, and a projection of the sealing member partially overlaps with a projection of the third portion along the thickness direction of the first wall.

2. The battery cell according to claim 1, wherein: The second portion includes a lap portion protruding from an outer circumferential surface of the third portion, and a portion of the sealing member is disposed between the lap portion and the first wall.

3. The battery cell according to claim 1 or 2, wherein: An outer diameter of the second portion is larger than an outer diameter of the first portion and an outer diameter of the third portion, and an outer diameter of the third portion is larger than an outer diameter of the first portion.

4. The battery cell according to claim 3, wherein: A difference between an outer diameter of the seal and an outer diameter of the second portion is greater than 0 mm and less than or equal to 5 mm.

5. The battery cell according to any one of claims 1 to 4, wherein: The seal includes a seal body and a first extension portion. Along the thickness direction of the first wall, the seal body is arranged between the electrode terminal and the first wall. The first extension portion is connected to the seal body. In the radial direction of the electrode terminal, at least a portion of the first extension portion is located between the hole wall of the first through hole and the electrode terminal. The battery cell according to claim 5 , wherein: In a radial direction of the electrode terminal, a first gap is defined between the first extension portion and a hole wall of the first through hole.

7. The battery cell according to claim 5 or 6, wherein: The battery cell further includes: an electrode assembly disposed in the housing, the electrode assembly having a tab; an adapter, electrically connecting the first portion and the tab; The first insulating member is disposed along a thickness direction of the first wall, and at least a portion of the first insulating member is disposed between the first wall and the adapter.

8. The battery cell according to claim 7, wherein: The first insulating member includes a first insulating member body and a second extension portion. Along the thickness direction of the first wall, the first insulating member body is arranged between the first wall and the adapter, and the second extension portion is connected to the first insulating member body. In the radial direction of the electrode terminal, at least a portion of the second extension portion is located between the hole wall of the first through hole and the electrode terminal.

9. The battery cell according to claim 8, wherein: In a radial direction of the electrode terminal, a second gap is defined between the second extension portion and the electrode terminal.

10. The battery cell according to claim 8 or 9, wherein: In a radial direction of the electrode terminal, at least a portion of the second extension portion is located between the first extension portion and the electrode terminal.

11. The battery cell according to any one of claims 1 to 10, wherein: The battery cell further includes a fixing member in a ring shape, comprising a first fixing portion and a second fixing portion connected to each other, wherein the first fixing portion is connected to the first wall, and the first fixing portion fixes the electrode terminal to the first wall through the second fixing portion.

12. The battery cell according to claim 11, wherein: The second fixing portion is provided with a first limiting portion, and the outer circumferential surface of the third portion is provided with a second limiting portion, and the second limiting portion cooperates with the first limiting portion to limit the circumferential rotation of the electrode terminal relative to the fixing member.

13. The battery cell according to claim 12, wherein: The first limiting portion is a first groove, the second limiting portion is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

14. The battery cell according to claim 13, wherein: The outer diameter of the second portion is greater than the outer diameter of the third portion, and a first step surface is formed between the second portion and the third portion; Along the thickness direction of the first wall, the first protrusion extends to the first step surface.

15. The battery cell according to claim 13 or 14, wherein: Along the thickness direction of the first wall, a projection of the first protrusion at least partially overlaps with a projection of the sealing member.

16. The battery cell according to any one of claims 1 to 15, wherein: The first wall includes a main body and a convex portion, the convex portion protrudes from the inner surface of the main body, and the outer surface of the first wall is formed with a concave portion at a position corresponding to the convex portion; The convex portion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connects the bottom wall and the main body, the bottom wall is provided with the first through hole, and a portion of the electrode terminal is provided in the concave portion.

17. The battery cell according to claim 16, wherein: The battery cell further comprises: An electrode assembly is disposed in the housing, and the electrode assembly has a tab; A connecting piece electrically connecting the electrode terminal and the tab; The adapter includes a first connecting portion connected to the tab, the first connecting portion is located to the side of the protrusion in a first direction, along the first direction, the projection of the first connecting portion at least partially overlaps with the projection of the protrusion, and the first direction is perpendicular to the thickness direction of the main body.

18. The battery cell according to claim 17, wherein: Along the first direction, a projection of the first connection portion at least partially overlaps with a projection of the electrode terminal.

19. A battery comprising the battery cell according to any one of claims 1 to 18.

20. An electrical device comprising the battery cell according to any one of claims 1 to 18 or the battery according to claim 19, wherein the battery cell or the battery is used to provide electrical energy.

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