Battery cell, battery, and electrical device

Abstract

A battery cell (20), a battery (100), and an electrical device (1000). The battery cell (20) comprises a housing (21), an electrode terminal (23), an electrode assembly (22), and an adapter (24). The housing (21) comprises a first wall (25), the first wall (25) comprising a body portion (251) and a protruding portion (252), the protruding portion (252) protruding from an inner surface of the body portion (251), and a recessed portion (253) being formed on an outer surface of the first wall (25) at a position corresponding to the protruding portion (252). The electrode terminal (23) is disposed at the first wall (25), and a part of the electrode terminal (23) is located in the recessed portion (253). The electrode assembly (22) is disposed in the housing (21), and the electrode assembly (22) is provided with a tab (221). The adapter (24) is electrically connected to the electrode terminal (23) and the tab (221). The adapter (24) comprises a first connecting portion (241) connected to the tab (221), the first connecting portion (241) being located at a side of the protruding portion (252) in a first direction (X), and a projection of the first connecting portion (241) and a projection of the protruding portion (252) along the first direction (X) at least partially overlap, the first direction (X) being perpendicular to a thickness direction (Z) of the body portion. The present solution can improve the energy density of the battery cell (20).

Description

Battery cells, batteries and electrical equipment Technical Field

[0001] 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

[0002] 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.

[0003] During the manufacturing process of batteries, the energy density of the battery is an issue that cannot be ignored. Therefore, how to improve the energy density of the battery is a technical problem that needs to be solved urgently in battery technology.

[0004] Summary of the Invention

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

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

[0007] In a first aspect, an embodiment of the present application provides a battery cell, which includes a shell, an electrode terminal, an electrode assembly and an adapter. The shell includes a first wall, 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 recess at a position corresponding to the convex portion. The electrode terminal is arranged on the first wall, and a part of the electrode terminal is located in the recess. The electrode assembly is arranged in the shell, and the electrode assembly has a tab. The adapter electrically connects 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 convex portion in a first direction, and along the first direction, the projection of the first connecting portion at least partially overlaps with the projection of the convex portion, and the first direction is perpendicular to the thickness direction of the main body.

[0008] According to the battery cell of the embodiment of the present application, the convex portion protrudes from the main body toward the interior of the battery cell, so that the electrode terminal can be arranged toward the interior of the battery cell, and the overall height of the battery cell can be smaller. At the same time, along the first direction, the projection of the first connecting portion and the projection of the convex portion at least partially overlap, reducing the distance between the electrode ear and the first wall in the thickness direction of the first wall, improving the space utilization inside the battery cell, and making the battery cell have a higher energy density.

[0009] 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.

[0010] In the above solution, the projection of the first connecting portion at least partially overlaps with the projection of the electrode terminal. The electrode terminal can be further arranged toward the interior of the battery cell to reduce the overall height of the battery cell, thereby improving the energy density of the battery cell.

[0011] According to some embodiments of the present application, the protrusion 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 first through hole.

[0012] In the above solution, a portion of the electrode terminal is disposed in the first through hole, which facilitates assembly and positioning of the electrode terminal and connection between the electrode terminal and the adapter.

[0013] According to some embodiments of the present application, the battery cell further includes a first insulating member, and along a thickness direction of the main body, at least a portion of the first insulating member is disposed between the first wall and the adapter.

[0014] In the above solution, at least a portion of the first insulating member is disposed between the first wall and the adapter, so as to insulate and isolate the first wall from the adapter.

[0015] According to some embodiments of the present application, the first insulating member includes: a first insulating member body, which is arranged between the first wall and the adapter along the thickness direction of the main body; a first extension portion, which is connected to the first insulating member body, and 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.

[0016] In the above solution, the first extension portion extends into the first through hole, which can reduce the risk of short circuit caused by contact between the electrode terminal and the hole wall of the first through hole.

[0017] 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 the electrode terminal.

[0018] In the above solution, a first gap is provided between the first extension portion and the electrode terminal to accommodate machining errors and facilitate assembly.

[0019] According to some embodiments of the present application, the battery cell further includes a first sealing member, and at least a portion of the first sealing member is disposed between the electrode terminal and the bottom wall along a thickness direction of the body portion.

[0020] In the above solution, the provision of the first sealing member can achieve sealing between the electrode terminals and the bottom wall, thereby reducing the risk of electrolyte leakage.

[0021] According to some embodiments of the present application, the first seal includes: a first seal body, which is arranged between the electrode terminal and the bottom wall along the thickness direction of the main body; a second extension portion, which is connected to the first seal body, and 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.

[0022] In the above solution, the second extension portion extends into the first through hole and is located between the hole wall of the first through hole and the electrode terminal, so as to reduce the risk of short circuit caused by contact between the electrode terminal and the hole wall of the first through hole.

[0023] 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 a hole wall of the first through hole.

[0024] In the above solution, a second gap is provided between the second extension portion and the wall of the first through hole, so as to accommodate machining errors and facilitate assembly.

[0025] According to some embodiments of the present application, in a radial direction of the electrode terminal, at least a portion of the first extension portion is located between the second extension portion and the electrode terminal.

[0026] In the above solution, at least a portion of the first extension portion is located between the second extension portion and the electrode terminal. On the one hand, it can realize the constraint of the first seal. On the other hand, the first extension portion and the second extension portion cooperate to reduce the risk of short circuit between the electrode terminal and the hole wall of the first through hole.

[0027] According to some embodiments of the present application, the first insulating member has a first insulating portion, and along the thickness direction of the main body, the projection of the first insulating portion overlaps with the projection of the bottom wall. The first insulating portion has a first surface facing away from the bottom wall, and the electrode terminal has a second surface closest to the inside of the battery cell, and the second surface is flush with the first surface.

[0028] In the above solution, the second surface is flush with the first surface, which facilitates the connection between the adapter and the electrode terminal.

[0029] According to some embodiments of the present application, the first insulating member has a first insulating portion, and along the thickness direction of the main body, the projection of the first insulating portion overlaps with the projection of the bottom wall. The first insulating portion has a first surface facing away from the bottom wall, and the electrode terminal extends beyond the first surface along the direction of the bottom wall pointing to the first insulating portion; a recess is formed on the side of the adapter facing the electrode terminal, and a portion of the electrode terminal is located in the recess and connected to the recess.

[0030] In the above solution, the electrode terminals protrude from the first surface and are positioned close to the interior of the battery cell. This reduces the height of the electrode terminals protruding from the outer surface of the first wall on the outside of the battery cell, thereby reducing the overall height of the battery cell and improving the energy density of the battery cell. The recessed portion facilitates connection between the electrode terminals and the adapter.

[0031] According to some embodiments of the present application, the first insulating member has a first insulating portion, and along the thickness direction of the main body, the projection of the first insulating portion overlaps with the projection of the bottom wall. The first insulating portion has a first surface facing away from the bottom wall, and the electrode terminal has a second surface closest to the inside of the battery cell, and the second surface is closer to the bottom surface of the recess than the first surface; a protrusion is formed on the side of the adapter facing the electrode terminal, and a portion of the protrusion is located in the first through hole and connected to the second surface.

[0032] In the above solution, the second surface is closer to the bottom surface of the recess than the first surface, and the size of the electrode terminal in the thickness direction of the body portion can be smaller, thereby reducing material costs.

[0033] According to some embodiments of the present application, the battery cell further includes a connector in a ring shape, which is welded and fixed to the first wall to form a first welding portion, and is used to fix the electrode terminal to the first wall.

[0034] In the above solution, the connecting member is ring-shaped to facilitate assembly with the electrode terminal, and the connecting member is used to fix the electrode terminal to the first wall to achieve fixation of the electrode terminal.

[0035] According to some embodiments of the present application, the protrusion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connecting the bottom wall and the main body; along the thickness direction of the main body, the projection of the first welding portion at least partially overlaps with the projection of the peripheral wall.

[0036] In the above solution, the projection of the first weld at least partially overlaps with the projection of the peripheral wall, providing increased strength at the connection between the main body and the connector. When the battery cell includes a first seal, the distance between the first seal and the first weld can be relatively small in the first direction. This can reduce the torsional force exerted by the first seal on the first weld, lowering the risk of cracking the first weld.

[0037] According to some embodiments of the present application, the battery cell further includes a second insulating member connected to the connecting member and the electrode terminal, and the second insulating member is used to separate the connecting member and the electrode terminal.

[0038] In the above solution, the second insulating member can insulate and isolate the connecting member from the electrode terminal.

[0039] According to some embodiments of the present application, the connecting member is provided with a first limiting portion, and the second insulating member is provided with a second limiting portion. The first limiting portion cooperates with the second limiting portion to limit the circumferential rotation of the second insulating member relative to the connecting member.

[0040] In the above solution, the first limiting portion and the second limiting portion cooperate to limit the circumferential rotation of the second insulating member relative to the connecting member, so as to facilitate the assembly of the connecting member and the electrode terminal.

[0041] According to some embodiments of the present application, along the thickness direction of the main body, the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal.

[0042] In the above solution, the projection of the first limiting portion and / or the second limiting portion at least partially overlaps with the projection of the electrode terminal, so that the connector and the electrode terminal have a larger overlapping area, so that the connector has a better fixing effect on the electrode terminal.

[0043] According to some embodiments of the present application, the first limiting portion is provided on the inner circumferential surface of the connecting member.

[0044] In the above solution, the first limiting portion is provided on the inner circumferential surface of the connecting member to facilitate assembly of the connecting member and the second insulating member.

[0045] According to some embodiments of the present application, the connecting member includes: a first connecting section, which is welded to the first wall and forms a first welding portion; a second connecting section, which is located on the inner circumference of the first connecting section, and along the thickness direction of the main body, the second connecting section is farther away from the interior of the shell than the first connecting section; a third connecting section, which connects the first connecting section and the second connecting section; wherein the first limiting portion is arranged on the inner circumference of the second connecting section.

[0046] In the above solution, the first limiting portion is arranged on the inner circumferential surface of the second connecting section, which has a simple structure and is easy to process and manufacture.

[0047] 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.

[0048] In the above solution, the first limiting portion is the first groove, and the second limiting portion is the first protrusion, which has a simple structure and is easy to process and manufacture.

[0049] According to some embodiments of the present application, the second insulating member is provided with a third limiting portion, and the electrode terminal is provided with a fourth limiting portion. The third limiting portion cooperates with the fourth limiting portion to limit the circumferential rotation of the electrode terminal relative to the second insulating member.

[0050] In the above solution, the third limiting portion and the fourth limiting portion cooperate to limit the circumferential rotation of the electrode terminal relative to the second insulating member, thereby facilitating the assembly of the second insulating member and the electrode terminal.

[0051] According to some embodiments of the present application, along the radial direction of the electrode terminal, the projection of the third limiting portion at least partially overlaps with the projection of the second limiting portion.

[0052] In the above solution, the projection of the third limiting portion and the projection of the second limiting portion at least partially overlap in the radial direction of the electrode terminal, so that the second insulating member has a better anti-rotation effect on the connecting member and the electrode terminal.

[0053] According to some embodiments of the present application, the electrode terminal includes a first part and a second part, the first part is located in the recess, along the thickness direction of the main body, the second part is located on the side of the first part away from the interior of the battery cell, the diameter of the second part is smaller than the diameter of the first part, and the fourth limiting portion is arranged on the outer peripheral surface of the second part.

[0054] In the above solution, the fourth limiting portion is provided on the outer peripheral surface of the second portion, and the distance between the electrode terminal and the first welding portion in the radial direction of the electrode assembly is small, thereby reducing the occupied assembly space.

[0055] According to some embodiments of the present application, a first step surface is formed between the second portion and the first portion, and the fourth limiting portion extends to the first step surface.

[0056] In the above solution, the fourth limiting portion extends to the first step surface, so as to provide a better anti-rotation effect between the second insulating member and the electrode terminal.

[0057] According to some embodiments of the present application, the fourth limiting portion is a second protrusion, and along the radial direction of the electrode terminal, the first part protrudes from the second protrusion, and the third limiting portion is a second groove, and at least a part of the second protrusion is embedded in the second groove.

[0058] In the above solution, the fourth limiting portion is the second protrusion, and the third limiting portion is the second groove, which has a simple structure and is easy to process and manufacture.

[0059] According to some embodiments of the present application, the electrode terminal also includes a third part, which is located on the side of the first part facing the interior of the battery cell along the thickness direction of the main body; the protrusion 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 part of the third part is provided in the first through hole.

[0060] In the above solution, a portion of the third portion is arranged in the first through hole so that the electrode terminal can be arranged close to the interior of the battery cell, reducing the space occupied by the electrode terminal outside the battery cell in the thickness direction of the main body and reducing the overall height of the battery cell.

[0061] According to some embodiments of the present application, the battery cell also includes a second seal, which is arranged in the recess, and the outer peripheral surface of the electrode terminal has a first pressing surface. Along the radial direction of the electrode terminal, the second seal is configured to be clamped between the first pressing surface and the inner peripheral surface of the recess.

[0062] In the above solution, a sealed connection between the electrode terminal and the first wall is achieved in the radial direction of the electrode terminal, thereby improving the sealing effect between the electrode terminal and the first wall.

[0063] According to some embodiments of the present application, the angle between the inner circumferential surface of the recess and the bottom surface of the recess is a first obtuse angle; the electrode terminal has a second pressing surface, and along the thickness direction of the main body, the second pressing surface and the bottom surface of the recess are arranged opposite to each other, the first pressing surface is connected to the second pressing surface, and the angle between the first pressing surface and the second pressing surface is a second obtuse angle.

[0064] In the above solution, the first pressing surface is arranged at an angle, so that a larger sealing area is provided between the electrode terminal and the inner peripheral surface of the recess.

[0065] According to some embodiments of the present application, the housing includes a shell and an end cover, the shell has an opening, the end cover closes the opening, and the first wall is the end cover.

[0066] In the above solution, the first wall is an end cover, which facilitates the assembly of the electrode terminal.

[0067] In a second aspect, an embodiment of the present application provides a battery, which includes a battery cell provided in any of the above embodiments.

[0068] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell as provided in any of the above embodiments or a battery as provided in any of the embodiments, and the battery cell or battery is used to provide electrical energy.

[0069] 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

[0070] 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.

[0071] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0072] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0073] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0074] FIG4 is a schematic structural diagram of a first wall provided in some embodiments of the present application;

[0075] FIG5 is a cross-sectional view taken along the AA direction of FIG4 ;

[0076] FIG6 is a partial enlarged view of point B in FIG5 ;

[0077] FIG7 is a schematic diagram of the assembly of the electrode terminal and the first wall provided in some embodiments of the present application;

[0078] FIG8 is a partial enlarged view of point C in FIG7;

[0079] FIG9 is a schematic diagram of the assembly of electrode terminals and adapters provided in some embodiments of the present application;

[0080] FIG10 is a schematic diagram of assembly of electrode terminals and adapters provided in other embodiments of the present application;

[0081] FIG11 is a schematic structural diagram of a connector provided in some embodiments of the present application;

[0082] FIG12 is a schematic structural diagram of a second insulating member provided in some embodiments of the present application;

[0083] FIG13 is a schematic structural diagram of electrode terminals provided in some embodiments of the present application;

[0084] FIG14 is a schematic diagram of the assembly of the electrode terminal and the first wall provided in some other embodiments of the present application;

[0085] FIG15 is a partial enlarged view of point D in FIG14 .

[0086] In the drawings, the drawings are not drawn to scale.

[0087] Marking instructions: 100-battery; 10-box; 11-first sub-box; 12-second sub-box; 20-battery cell; 21-housing; 211-housing; 212-end cover; 22-electrode assembly; 221-ear; 23-electrode terminal; 231-second surface; 232-fourth limiting portion; 233-first part; 234-second part; 235-first step surface; 236-third part; 237-first pressing surface; 238-second pressing surface; 24-adapter; 241-first connecting portion; 242-recessed portion; 243-protruding portion; 25-first wall; 251-body; 252-protruding portion; 253-recessed portion; 254-bottom wall; 255-peripheral wall; 256-first through hole; 257-inner circumference of the recessed portion; 2 58-bottom surface of the recess; 26-first insulating member; 261-first insulating member body; 262-first extension portion; 263-second through hole; 264-first insulating portion; 265-first surface; 27-first sealing member; 271-first sealing member body; 272-second extension portion; 28-connecting member; 280-first welding portion; 281-first limiting portion; 282-first connecting section; 283-second connecting section; 284-third connecting section; 29-second insulating member; 291-second limiting portion; 292-third limiting portion; 30-second sealing member; 200-controller; 300-motor; 1000-vehicle; J-radial direction of the electrode terminal; Q1-first gap; Q2-second gap; X-first direction; Z-thickness direction of the main body. DETAILED DESCRIPTION

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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).

[0094] 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.

[0095] 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.

[0096] 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.

[0097] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver-plated surface 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.).

[0104] 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.

[0105] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0106] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] In some embodiments, the electrode assembly is a laminate structure.

[0114] 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).

[0115] 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.

[0116] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be provided on the end cap or on the housing.

[0117] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0118] As an example, the battery cell can be a cylindrical battery cell, 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, etc. There is no special limitation in the embodiments of the present application.

[0119] The development of battery technology must take into account multiple design factors at the same time, such as reliability, discharge capacity, charge and discharge rate and other performance parameters. In addition, the energy density of the battery must also be considered.

[0120] A battery cell includes a housing, an electrode assembly, and electrode terminals. The housing includes a first wall, on which the electrode terminals are mounted, and the electrode assembly is disposed within the housing. The electrode terminals typically protrude from the outer surface of the first wall. The thickness of the first wall generally corresponds to the height of the battery cell, and the extent to which the electrode terminals protrude from the outer surface of the first wall determines the height of the battery cell. In some embodiments, one end of the electrode terminal protrudes from the outer surface of the first wall, and the other end is used to electrically connect to the tab of the electrode assembly. Because the tab occupies a certain amount of assembly space, the energy density of the battery cell is relatively low.

[0121] In view of this, in order to solve the problem of low energy density of battery cells caused by space occupied by the tabs, the present application provides a technical solution, wherein the battery cell includes a shell, an electrode terminal, an electrode assembly and an adapter. The shell includes a first wall, 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 recessed portion at a position corresponding to the convex portion. The electrode assembly is arranged on the first wall, and a part of the electrode terminal is located in the recessed portion. The electrode assembly is arranged in the shell, and the electrode assembly has a tab. The adapter electrically connects 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 convex portion in a first direction, and along the first direction, the projection of the first connecting portion at least partially overlaps with the projection of the convex portion, and the first direction is perpendicular to the thickness direction of the main body. The battery cell can improve the internal space utilization of the battery cell, thereby improving the energy density of the battery cell.

[0122] In such a battery cell, the convex portion protrudes from the main body toward the interior of the battery cell, and a concave portion is formed on the outer surface of the first wall at a position corresponding to the convex portion. A portion of the electrode terminal is located in the concave portion, so that the electrode terminal can be set toward the interior of the battery cell, and the overall height of the battery cell can be smaller. At the same time, along the first direction, the projection of the first connecting portion and the projection of the convex portion at least partially overlap, and the space on the side of the convex portion is reasonably utilized, reducing the distance between the electrode ear and the first wall in the thickness direction of the first wall, thereby improving the space utilization inside the battery cell and making the battery cell have a higher energy density.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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, etc.

[0134] 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 match 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 makes the end cap 212 less likely to deform when subjected to compression or collision, giving the battery cell 20 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, or aluminum alloy, and this is not particularly limited in the present embodiment. In some embodiments, an insulating structure can also 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.

[0135] 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 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body.

[0136] Referring to FIG3 , and further to FIG4 through FIG6 , FIG4 is a schematic diagram of the structure of a first wall according to some embodiments of the present application. FIG5 is a cross-sectional view taken along the AA direction of FIG4 , and FIG6 is a partially enlarged view of a portion B of FIG5 . Embodiments of the present application provide a battery cell 20 comprising a housing 21 , an electrode terminal 23 , an electrode assembly 22 , and an adapter 24 . The housing 21 includes a first wall 25 , which comprises a body 251 and a protrusion 252 . The protrusion 252 protrudes from the inner surface of the body 251 . A recess 253 is formed on the outer surface of the first wall 25 at a position corresponding to the protrusion 252 . The electrode terminal 23 is disposed on the first wall 25 , with a portion of the electrode terminal 23 positioned within the recess 253 . The electrode assembly 22 is disposed within the housing 21 and has a tab 221 . The adapter 24 electrically connects the electrode terminal 23 and the tab 221 . The adapter 24 includes a first connecting portion 241 connected to the tab 221. The first connecting portion 241 is located on the side of the protrusion 252 in the first direction X. Along the first direction X, the projection of the first connecting portion 241 at least partially overlaps with the projection of the protrusion 252. The first direction X is perpendicular to the thickness direction Z of the main body.

[0137] In the figure, the direction indicated by the letter X is the first direction, and the direction indicated by the letter Z is the thickness direction of the main body.

[0138] The first wall 25 is a wall portion of the outer shell 21. The first wall 25 may be an end cover or a wall portion of the housing.

[0139] The inner surface of the body portion 251 refers to a surface of the body portion 251 facing the electrode assembly 22 .

[0140] The outer surface of the first wall 25 refers to the surface of the first wall 25 facing away from the electrode assembly 22 .

[0141] “The convex portion 252 protrudes from the inner surface of the main body portion 251 , and the outer surface of the first wall 25 has a concave portion 253 formed at a position corresponding to the convex portion 252 ” may be that the first wall 25 is formed with the convex portion 252 and the concave portion 253 by stamping, and the concave portion 253 may be a pit or a groove.

[0142] A portion of the electrode terminal 23 is located in the recess 253 , so that the electrode terminal 23 is disposed toward the interior of the battery cell 20 , reducing the size of the electrode terminal 23 protruding from the outer surface of the first wall 25 .

[0143] The adapter 24 electrically connects the electrode terminal 23 and the tab 221. The electrode terminal 23 and the tab 221 can be welded to the adapter 24. The adapter 24 can also include a second connection portion connected to the electrode terminal 23. The second connection portion and the first connection portion 241 can be spaced apart in the first direction X.

[0144] The first connection portion 241 is located on the side of the protrusion 252 in the first direction X, which means that the protrusion 252 and the first connection portion 241 are spaced apart along the first direction X, that is, along the thickness direction Z of the main body, the projection of the first connection portion 241 does not overlap with the projection of the protrusion 252.

[0145] In some embodiments, the first direction X may be parallel to a width direction of the battery cell 20 .

[0146] The electrode terminals 23 include a positive electrode terminal and a negative electrode terminal, the adapter 24 includes a positive adapter and a negative adapter, and the tabs 221 include a positive tab and a negative tab. The positive electrode terminal and the positive tab are electrically connected via the positive adapter 24, and the negative electrode terminal and the negative tab are electrically connected via the negative adapter 24. Correspondingly, there are two protrusions 252, with the positive electrode terminal corresponding to one protrusion 252 and the negative electrode terminal corresponding to the other protrusion 252.

[0147] In some embodiments, along the first direction X, the projection of the first connection portion 241 partially overlaps with the projection of the convex portion 252 , or, along the first direction X, the projection of the first connection portion 241 completely overlaps with the projection of the convex portion 252 .

[0148] Along the first direction X, the projection of the first connecting portion 241 at least partially overlaps with the projection of the protrusion 252. Since the first connecting portion 241 is connected to the pole ear 221, the pole ear 221 can be located on the side of the protrusion 252 in the first direction X, and the pole ear 221 can be arranged close to the first wall 25 to reasonably utilize the space on the side of the protrusion 252 in the first direction X.

[0149] According to the battery cell 20 of the embodiment of the present application, the protrusion 252 protrudes from the main body 251 toward the inside of the battery cell 20, and a recess 253 is formed on the outer surface of the first wall 25 at a position corresponding to the protrusion 252. A portion of the electrode terminal 23 is arranged in the recess 253, so that the electrode terminal 23 can be arranged toward the inside of the battery cell 20, and the overall height of the battery cell 20 can be smaller. At the same time, along the first direction X, the first connecting portion 241 is located on the side of the protrusion 252, and the projection of the first connecting portion 241 at least partially overlaps with the projection of the protrusion 252. The space on the side of the protrusion 252 is reasonably utilized, and the distance between the pole ear 221 and the first wall 25 in the thickness direction of the first wall 25 is reduced, thereby improving the space utilization inside the battery cell 20, so that the battery cell 20 has a higher energy density.

[0150] 6 , according to some embodiments of the present application, along the first direction X, the projection of the first connection portion 241 at least partially overlaps with the projection of the electrode terminal 23 .

[0151] In some embodiments, along the first direction X, the projection of the first connection portion 241 partially overlaps with the projection of the electrode terminal 23 , or, along the first direction X, the projection of the first connection portion entirely overlaps with the projection of the electrode terminal 23 .

[0152] In the above solution, the projection of the first connecting portion 241 at least partially overlaps with the projection of the electrode terminal 23 , and the electrode terminal 23 can be further arranged toward the interior of the battery cell 20 to reduce the overall height of the battery cell 20 so as to improve the energy density of the battery cell 20 .

[0153] Please refer to Figure 5 and further to Figure 7, which is a schematic diagram of the assembly of the electrode terminal and the first wall according to some embodiments of the present application. According to some embodiments of the present application, the protrusion 252 includes a bottom wall 254 and a peripheral wall 255 surrounding the bottom wall 254. The peripheral wall 255 connects the bottom wall 254 and the main body 251. The bottom wall 254 is provided with a first through hole 256, and a portion of the electrode terminal 23 is disposed in the first through hole 256.

[0154] The inner surface of the bottom wall 254 and the inner surface of the peripheral wall 255 define a recess 253 .

[0155] The thickness direction of the bottom wall 254 may be parallel to the thickness direction Z of the body portion. The first through hole 256 penetrates the bottom wall 254 along the thickness direction Z of the body portion, so that the recess 253 communicates with the interior of the battery cell 20 through the first through hole 256 .

[0156] A portion of the electrode terminal 23 is disposed in the first through hole 256 , so as to facilitate connection between the electrode terminal 23 and the adapter 24 .

[0157] In the above solution, a portion of the electrode terminal 23 is disposed in the first through hole 256 , which facilitates the assembly and positioning of the electrode terminal 23 and the connection between the electrode terminal 23 and the adapter 24 .

[0158] 7 , according to some embodiments of the present application, the battery cell 20 further includes a first insulating member 26 . Along the thickness direction Z of the body, at least a portion of the first insulating member 26 is disposed between the first wall 25 and the adapter 24 .

[0159] Along the thickness direction Z of the main body, the entire first insulating member 26 is located between the first wall 25 and the adapter 24 , or a portion of the first insulating member 26 is disposed between the first wall 25 and the adapter 24 , and another portion of the first insulating member 26 is disposed in the first through hole 256 .

[0160] In the above solution, at least a portion of the first insulating member 26 is disposed between the first wall 25 and the adapter 24 , so as to insulate and isolate the first wall 25 from the adapter 24 .

[0161] Please refer to Figure 7 and further to Figure 8, which is a partial enlarged view of point C in Figure 7. According to some embodiments of the present application, the first insulating member 26 includes a first insulating member body 261 and a first extension portion 262. Along the thickness direction Z of the body, the first insulating member body 261 is disposed between the first wall 25 and the adapter 24; the first 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 first extension portion 262 is located between the hole wall of the first through hole 256 and the electrode terminal 23.

[0162] In some embodiments, the first insulating member body 261 defines a second through hole 263 corresponding to the first through hole 256 , and the first extending portion 262 is disposed around the second through hole 263 and extends into the first through hole 256 .

[0163] The first extension portion 262 is connected to the first insulation body 261 . The first extension portion 262 and the first insulation body 261 may be integrally formed, or the first extension portion 262 and the first insulation body 261 may be connected by thermal melting.

[0164] The radial direction J of the electrode terminal is perpendicular to the thickness direction Z of the body. 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.

[0165] In the above solution, the first extension portion 262 extends into the first through hole 256 , which can reduce the risk of the electrode terminal 23 contacting the hole wall of the first through hole 256 and causing a short circuit.

[0166] 7 and 8 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, a first gap Q1 is defined between the first extension portion 262 and the electrode terminal 23 .

[0167] The first gap Q1 prevents the first extension portion 262 from contacting the electrode terminal 23, maintaining a certain distance between the first extension portion 262 and the electrode terminal 23 in the electrode terminal's radial direction J. This reduces the effects of high temperatures on the first extension portion 262 during welding of the electrode terminal 23 to the adapter 24.

[0168] In the above solution, a first gap Q1 is provided between the first extension portion 262 and the electrode terminal 23 to accommodate machining errors and facilitate assembly.

[0169] 7 and 8 , according to some embodiments of the present application, the battery cell 20 further includes a first seal 27 . At least a portion of the first seal 27 is disposed between the electrode terminal 23 and the bottom wall 254 along the thickness direction Z of the body.

[0170] In some embodiments, along the thickness direction Z of the main body, the first seal 27 is entirely disposed between the electrode terminal 23 and the bottom wall 254 , or a portion of the first seal 27 is disposed between the electrode terminal 23 and the bottom wall 254 , and another portion of the first seal 27 is disposed in the first through hole 256 .

[0171] When at least a portion of the first sealing member 27 is disposed between the electrode terminal 23 and the bottom wall 254 , a seal can be formed between the electrode terminal 23 and the bottom wall 254 to prevent the electrolyte from flowing out through the gap between the electrode terminal 23 and the bottom wall 254 .

[0172] It should be pointed out that, here, at least a portion of the first seal 27 is arranged between the electrode terminal 23 and the bottom wall 254, which means that at least a portion of the first seal 27 is arranged between the electrode terminal 23 and the inner surface of the bottom wall 254, that is, at least a portion of the first seal 27 is arranged between the electrode terminal 23 and the bottom surface 258 of the recess.

[0173] In the above solution, the provision of the first sealing member 27 can achieve sealing between the electrode terminal 23 and the bottom wall 254, thereby reducing the risk of electrolyte leakage.

[0174] Please refer to Figures 7 and 8. According to some embodiments of the present application, the first seal 27 includes a first seal body 271 and a second extension portion 272. Along the thickness direction Z of the body, the first seal body 271 is arranged between the electrode terminal 23 and the bottom wall 254; the second extension portion 272 is connected to the first seal body 271. In the radial direction J of the electrode terminal, at least a portion of the second extension portion 272 is located between the hole wall of the first through hole 256 and the electrode terminal 23.

[0175] The first sealant body 271 is disposed between the electrode terminal 23 and the bottom wall 254 along the thickness direction Z of the body portion to form a seal between the electrode terminal 23 and the bottom wall 254 .

[0176] The second extension portion 272 is connected to the first sealing body 271 . The second extension portion 272 and the first sealing body 271 may be integrally formed, or the second extension portion 272 and the first sealing body 271 may be connected by thermal melting.

[0177] In some embodiments, the first sealing member body 271 is provided with a third through hole corresponding to the first through hole 256 , and the second extension portion 272 is provided around the third through hole and extends into the first through hole 256 .

[0178] In the above solution, the second extension portion 272 extends into the first through hole 256 and is located between the hole wall of the first through hole 256 and the electrode terminal 23 to reduce the risk of short circuit caused by contact between the electrode terminal 23 and the hole wall of the first through hole 256 .

[0179] 7 and 8 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, a second gap Q2 is defined between the second extension portion 272 and the wall of the first through hole 256 .

[0180] The second gap Q2 is set so that the second extension portion 272 does not contact the hole wall of the first through hole 256 . In the radial direction J of the electrode terminal, there is a certain distance between the second extension portion 272 and the hole wall of the first through hole 256 .

[0181] In the above solution, a second gap Q2 is defined between the second extension portion 272 and the wall of the first through hole 256 to accommodate machining errors and facilitate assembly.

[0182] 7 and 8 , according to some embodiments of the present application, in the radial direction J of the electrode terminal, at least a portion of the first extension portion 262 is located between the second extension portion 272 and the electrode terminal 23 .

[0183] In some embodiments, in the radial direction J of the electrode terminal, the portion of the first extension portion 262 located between the second extension portion 272 and the second electrode terminal 23 contacts the second extension portion 272, and the first extension portion 262 can constrain the second extension portion 272 in the radial direction J of the electrode terminal to facilitate the positioning of the first seal 27.

[0184] In the above scheme, at least a portion of the first extension portion 262 is located between the second extension portion 272 and the electrode terminal 23. On the one hand, it can realize the constraint of the first seal 27. On the other hand, the first extension portion 262 and the second extension portion 272 cooperate to reduce the risk of short circuit between the electrode terminal 23 and the hole wall of the first through hole 256.

[0185] Please refer to Figure 7. According to some embodiments of the present application, the first insulating member 26 has a first insulating portion 264. Along the thickness direction Z of the main body, the projection of the first insulating portion 264 overlaps with the projection of the bottom wall 254. The first insulating portion 264 has a first surface 265 facing away from the bottom wall 254. The electrode terminal 23 has a second surface 231 closest to the interior of the battery cell 20, and the second surface 231 is flush with the first surface 265.

[0186] The projection of the first insulating portion 264 overlaps with the projection of the bottom wall 254 . The first insulating portion 264 may be disposed on the side of the bottom wall 254 facing the electrode assembly 22 . The first insulating portion 264 may be connected to the surface of the bottom wall 254 facing the electrode assembly 22 .

[0187] The first surface 265 is a surface of the first insulating portion 264 facing away from the bottom wall 254 . That is, the first surface 265 is a surface of the first insulating portion 264 facing the electrode assembly 22 .

[0188] The second surface 231 may be an end surface of the electrode terminal 23 that is closest to the electrode assembly 22 .

[0189] The second surface 231 is flush with the first surface 265 , which means that the second surface 231 is substantially flush with the first surface 265 , and a processing error may exist (for example, the processing error is within 0.05 mm).

[0190] In the above solution, the second surface 231 is flush with the first surface 265 , which facilitates the connection between the adapter 24 and the electrode terminal 23 .

[0191] Please refer to Figure 9, which is a schematic diagram of the assembly of the electrode terminal and the adapter provided in some embodiments of the present application. According to some embodiments of the present application, the first insulating member 26 has a first insulating portion 264. Along the thickness direction Z of the main body, the projection of the first insulating portion 264 overlaps with the projection of the bottom wall 254. The first insulating portion 264 has a first surface 265 facing away from the bottom wall 254. The electrode terminal 23 extends beyond the first surface 265 along the direction from the bottom wall 254 to the first insulating portion 264. A recessed portion 242 is formed on the side of the adapter 24 facing the electrode terminal 23. A portion of the electrode terminal 23 is located within and connected to the recessed portion 242.

[0192] “The electrode terminal 23 extends beyond the first surface 265 along the direction of the bottom wall 254 toward the first insulating portion 264 ” means that the end surface of the electrode terminal 23 close to the electrode assembly 22 is closer to the electrode assembly 22 than the first surface 265 .

[0193] The recessed portion 242 may be a groove, and a portion of the electrode terminal 23 may be connected to the bottom wall 254 of the groove.

[0194] In the above embodiment, the electrode terminal 23 protrudes from the first surface 265 and is positioned close to the interior of the battery cell 20. This reduces the height of the electrode terminal 23 protruding from the outer surface of the first wall 25 outside the battery cell 20, thereby reducing the overall height of the battery cell 20 and improving the energy density of the battery cell 20. The recessed portion 242 is provided to facilitate connection between the electrode terminal 23 and the adapter 24.

[0195] Please refer to Figure 10, which is a schematic diagram of the assembly of the electrode terminal and the adapter according to some other embodiments of the present application. According to some embodiments of the present application, the first insulating member 26 has a first insulating portion 264. Along the thickness direction Z of the body, the projection of the first insulating portion 264 overlaps with the projection of the bottom wall 254. The first insulating portion 264 has a first surface 265 facing away from the bottom wall 254. The electrode terminal 23 has a second surface 231 closest to the interior of the battery cell 20. The second surface 231 is closer to the bottom surface 258 of the recess than the first surface 265. The adapter 24 has a protrusion 243 formed on the side facing the electrode terminal 23. A portion of the protrusion 243 is located within the first through hole 256 and connected to the second surface 231.

[0196] The opening of the recess 253 and the bottom surface 258 of the recess are arranged opposite each other along the thickness direction Z of the body portion. The bottom surface 258 of the recess is closer to the electrode assembly 22 than the opening of the recess 253. The bottom surface 258 of the recess can be the inner surface of the bottom wall 254, that is, the surface of the bottom wall 254 facing away from the interior of the battery cell 20.

[0197] In some embodiments, the bottom surface 258 of the recess is perpendicular to the thickness direction Z of the main body.

[0198] The second surface 231 is the end surface of the electrode terminal 23 closest to the electrode assembly 22 . The second surface 231 is closer to the bottom surface 258 of the recess than the first surface 265 . The second surface 231 may be located in the first through hole 256 .

[0199] The portion of the adapter 24 corresponding to the first through hole 256 protrudes toward the inside of the first through hole 256 to form a protruding portion 243 .

[0200] In the above solution, the second surface 231 is closer to the bottom surface 258 of the recess than the first surface 265 , so the size of the electrode terminal 23 in the thickness direction Z of the body portion can be smaller, thereby reducing material costs.

[0201] Please refer to Figure 7 and further to Figure 11, which is a schematic diagram of the structure of a connector provided in some embodiments of the present application. According to some embodiments of the present application, the battery cell 20 also includes a connector 28. The connector 28 is annular and is welded to the first wall 25 to form a first weld portion 280. The connector 28 is used to secure the electrode terminal 23 to the first wall 25.

[0202] The connecting member 28 is ring-shaped and can be sleeved on the outside of the electrode terminal 23 so that the connecting member 28 can fix the electrode terminal 23 to the first wall 25 .

[0203] The first welding portion 280 is formed by welding the connector 28 to the first wall 25. After the connector 28 is welded to the first wall 25, a portion of the connector 28 engages with the electrode terminal 23 to secure the electrode terminal 23 to the first wall 25, limiting movement of the electrode terminal 23 relative to the first wall 25.

[0204] In the above solution, the connecting member 28 is annular to facilitate assembly with the electrode terminal 23 . The connecting member 28 is used to fix the electrode terminal 23 to the first wall 25 to achieve fixation of the electrode terminal 23 .

[0205] Please refer to Figure 7. According to some embodiments of the present application, the protrusion 252 includes a bottom wall 254 and a peripheral wall 255 surrounding the bottom wall 254, and the peripheral wall 255 connects the bottom wall 254 and the main body 251; along the thickness direction Z of the main body, the projection of the first welding portion 280 at least partially overlaps with the projection of the peripheral wall 255.

[0206] After the protrusion 252 is formed on the first wall 25 by punching, the peripheral wall 255 has a larger dimension in the thickness direction Z of the main body portion, and the peripheral wall 255 has a higher strength.

[0207] In the above embodiment, the projection of the first weld portion 280 at least partially overlaps with the projection of the peripheral wall 255, thereby enhancing the strength of the connection between the main body 251 and the connector 28. When the battery cell 20 includes the first seal 27, the distance between the first seal 27 and the first weld portion 280 in the first direction X can be reduced. This can reduce the torsional force exerted by the first seal 27 on the first weld portion 280 and lower the risk of cracking the first weld portion 280.

[0208] Please refer to Figure 7 and further to Figure 12, which is a schematic diagram of the structure of a second insulating member provided in some embodiments of the present application. According to some embodiments of the present application, the battery cell 20 also includes a second insulating member 29, which is connected to the connector 28 and the electrode terminal 23 and is used to separate the connector 28 and the electrode terminal 23.

[0209] The second insulating member 29 is an insulating structure provided between the connecting member 28 and the electrode terminal 23 .

[0210] In some embodiments, the second insulating member 29 is annular, the second insulating member 29 is sleeved on the outside of the electrode terminal 23 , and the connecting member 28 is sleeved on the second insulating member 29 .

[0211] In the above solution, the second insulating member 29 can insulate and isolate the connecting member 28 from the electrode terminal 23 .

[0212] 11 and 12 , according to some embodiments of the present application, the connecting member 28 is provided with a first limiting portion 281 , and the second insulating member 29 is provided with a second limiting portion 291 . The first limiting portion 281 cooperates with the second limiting portion 291 to limit the circumferential rotation of the second insulating member 29 relative to the connecting member 28 .

[0213] The first limiting portion 281 and the second limiting portion 291 are mutually cooperating structures, for example, a cooperating structure of a protrusion and a groove, or a cooperating structure of a protrusion and a hole, so as to limit the rotation of the second insulating member 29 relative to the connecting member 28 in the circumferential direction of the connecting member 28.

[0214] The number of the first limiting portions 281 can be one, two, or more. Correspondingly, the number of the second limiting portions 291 is the same as that of the first limiting portions 281 , and the second limiting portions 291 correspond to the first limiting portions 281 one to one.

[0215] In the above solution, the first limiting portion 281 and the second limiting portion 291 cooperate to limit the circumferential rotation of the second insulating member 29 relative to the connecting member 28 , so as to facilitate the assembly of the connecting member 28 and the electrode terminal 23 .

[0216] According to some embodiments of the present application, along the thickness direction Z of the body portion, the projection of the first limiting portion 281 and / or the second limiting portion 291 at least partially overlaps with the projection of the electrode terminal 23 .

[0217] Observed along the thickness direction Z of the main body, the first limiting portion 281 at least partially overlaps with the electrode terminal 23 , or the second limiting portion 291 at least partially overlaps with the electrode terminal 23 , or both the first limiting portion 281 and the second limiting portion 291 partially overlap with the electrode terminal 23 .

[0218] In the above scheme, the projection of the first limiting portion 281 and / or the second limiting portion 291 at least partially overlaps with the projection of the electrode terminal 23, so that the connecting member 28 and the electrode terminal 23 have a larger overlapping area, so that the connecting member 28 has a better fixing effect on the electrode terminal 23.

[0219] According to some embodiments of the present application, the first limiting portion 281 is provided on the inner circumferential surface of the connecting member 28 .

[0220] The inner peripheral surface of the connection member 28 refers to the surface of the connection member 28 that is close to the electrode terminal 23 .

[0221] In the above solution, the first limiting portion 281 is provided on the inner circumferential surface of the connecting member 28 to facilitate the assembly of the connecting member 28 and the second insulating member 29 .

[0222] Please refer to Figures 7 and 11. According to some embodiments of the present application, the connecting member 28 includes a first connecting segment 282, a second connecting segment 283 and a third connecting segment 284. The first connecting segment 282 is welded to the first wall 25 to form a first welding portion 280; the second connecting segment 283 is located on the inner circumference of the first connecting segment 282, and along the thickness direction Z of the main body, the second connecting segment 283 is farther away from the interior of the shell 21 than the first connecting segment 282; the third connecting segment 284 connects the first connecting segment 282 and the second connecting segment 283; wherein, the first limiting portion 281 is arranged on the inner circumference of the second connecting segment 283.

[0223] The first connecting section 282 is farther away from the central axis of the electrode terminal 23 than the second connecting section 283 .

[0224] The first connecting segment 282 , the third connecting segment 284 and the second connecting segment 283 may be integrally formed.

[0225] “Along the thickness direction Z of the main body, the second connecting segment 283 is farther away from the interior of the shell 21 than the first connecting segment 282” can mean that the second connecting segment 283 is located on the side of the first connecting segment 282 away from the main body 251, and the second connecting segment 283 is farther away from the main body 251 relative to the first connecting segment 282.

[0226] In the above solution, the first limiting portion 281 is provided on the inner circumferential surface of the second connecting section 283 , which has a simple structure and is easy to manufacture.

[0227] 11 and 12 , according to some embodiments of the present application, the first limiting portion 281 is a first groove, the second limiting portion 291 is a first protrusion, and at least a portion of the first protrusion is embedded in the first groove.

[0228] The first limiting portion 281 may be a first groove provided on the inner circumferential surface of the connecting member 28 , and the second limiting portion 291 may be a first protrusion provided on the circumferential surface of the second insulating member 29 .

[0229] In the above solution, the first limiting portion 281 is a first groove, and the second limiting portion 291 is a first protrusion, which has a simple structure and is easy to process and manufacture.

[0230] Please refer to Figure 12 and further to Figure 13, 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 insulating member 29 is provided with a third limiting portion 292, and the electrode terminal 23 is provided with a fourth limiting portion 232. The third limiting portion 292 cooperates with the fourth limiting portion 232 to limit the circumferential rotation of the electrode terminal 23 relative to the second insulating member 29.

[0231] The third limiting portion 292 and the fourth limiting portion 232 are mutually cooperating structures, for example, a cooperating structure of a protrusion and a groove, or a cooperating structure of a protrusion and a hole, so as to limit the rotation of the electrode terminal 23 relative to the second insulating member 29 in the axial direction of the electrode terminal 23.

[0232] The number of the third limiting portions 292 can be one, two, or more. Correspondingly, the number of the fourth limiting portions 232 is the same as the number of the third limiting portions 292 , and the fourth limiting portions 232 correspond to the third limiting portions 292 one-to-one.

[0233] In the above solution, the third limiting portion 292 cooperates with the fourth limiting portion 232 to limit the circumferential rotation of the electrode terminal 23 relative to the second insulating member 29 , thereby facilitating the assembly of the second insulating member 29 and the electrode terminal 23 .

[0234] According to some embodiments of the present application, along the radial direction J of the electrode terminal, the projection of the third limiting portion 292 at least partially overlaps with the projection of the second limiting portion 291 .

[0235] When viewed along the radial direction J of the electrode terminal, the third limiting portion 292 at least partially overlaps with the second limiting portion 291 .

[0236] In the above solution, the projection of the third limiting portion 292 and the projection of the second limiting portion 291 at least partially overlap in the radial direction J of the electrode terminal, so that the second insulating member 29 has a better anti-rotation effect on the connecting member 28 and the electrode terminal 23.

[0237] Please refer to Figures 7 and 13. According to some embodiments of the present application, the electrode terminal 23 includes a first part 233 and a second part 234. The first part 233 is located in the recess 253. Along the thickness direction Z of the main body, the second part 234 is located on the side of the first part 233 that is away from the interior of the battery cell 20. The diameter of the second part 234 is smaller than the diameter of the first part 233. The fourth limiting portion 232 is arranged on the outer peripheral surface of the second part 234.

[0238] The first portion 233 and the second portion 234 are distributed in the thickness direction Z of the main body. The second portion 234 is located on a side of the first portion 233 that is away from the interior of the battery cell 20 .

[0239] In some embodiments, the first portion 233 is located in the recess 253 , and a portion of the second portion 234 may protrude from the body portion 251 in a direction in which the protrusion 252 faces away from the electrode assembly 22 .

[0240] The diameter of the second portion 234 is smaller than that of the first portion 233 , and the second insulating member 29 can be sleeved on the second portion 234 .

[0241] The fourth limiting portion 232 is arranged on the outer circumference of the second part 234, and the third limiting portion 292 can be arranged on the inner circumference of the second insulating member 29, so that the third limiting portion 292 and the fourth limiting portion 232 can cooperate when the second insulating member 29 is sleeved on the second part 234.

[0242] In the above solution, the fourth limiting portion 232 is provided on the outer peripheral surface of the second portion 234 , and the distance between the electrode terminal 23 and the first welding portion 280 in the radial direction of the electrode assembly 22 is small, thereby reducing the occupied assembly space.

[0243] Referring to FIG. 13 , according to some embodiments of the present application, a first stepped surface 235 is formed between the second portion 234 and the first portion 233 , and the fourth limiting portion 232 extends to the first stepped surface 235 .

[0244] The diameter of the second portion 234 is smaller than the diameter of the first portion 233 , such that a first step surface 235 is formed between the second portion 234 and the first portion 233 .

[0245] Along the thickness direction Z of the main body, the fourth limiting portion 232 extends to the first step surface 235 , and the fourth limiting portion 232 connects the second portion 234 and the first portion 233 .

[0246] In the above solution, the fourth limiting portion 232 extends to the first step surface 235 , so as to achieve a better anti-rotation effect between the second insulating member 29 and the electrode terminal 23 .

[0247] Please refer to Figures 12 and 13. According to some embodiments of the present application, the fourth limiting portion 232 is a second protrusion, and along the radial direction J of the electrode terminal, the first portion 233 protrudes from the second protrusion. The third limiting portion 292 is a second groove, and at least a portion of the second protrusion is embedded in the second groove.

[0248] The third limiting portion 292 may be a second groove provided on the inner circumferential surface of the second insulating member 29 , and the fourth limiting portion 232 may be a second protrusion provided on the outer circumferential surface of the second portion 234 .

[0249] In the above solution, the fourth limiting portion 232 is a second protrusion, and the third limiting portion 292 is a second groove, which has a simple structure and is easy to process and manufacture.

[0250] Please refer to Figures 7 to 9. According to some embodiments of the present application, the electrode terminal 23 also includes a third portion 236. Along the thickness direction Z of the main body, the third portion 236 is located on the side of the first portion 233 facing the interior of the battery cell 20; the protrusion 252 includes a bottom wall 254 and a peripheral wall 255 surrounding the bottom wall 254, the peripheral wall 255 connects the bottom wall 254 and the main body 251, and the bottom wall 254 is provided with a first through hole 256. A portion of the third portion 236 is disposed in the first through hole 256.

[0251] Along the thickness direction Z of the main body, the second portion 234 , the first portion 233 and the third portion 236 are sequentially arranged. The third portion 236 is closer to the electrode assembly 22 than the second portion 234 .

[0252] A portion of the third portion 236 is disposed in the first through hole 256 , and the electrode terminal 23 is disposed toward the interior of the battery cell 20 , so that the third portion 236 is electrically connected to the adapter 24 .

[0253] In the above scheme, a portion of the third part 236 is arranged in the first through hole 256, so that the electrode terminal 23 can be arranged close to the interior of the battery cell 20, reducing the space occupied by the electrode terminal 23 outside the battery cell 20 in the thickness direction Z of the main body, and reducing the overall height of the battery cell 20.

[0254] In some embodiments, the diameter of the third portion 236 is smaller than that of the first portion 233, and a second step surface is formed between the third portion 236 and the first portion 233. The first sealing member body 271 is located between the second step surface and the bottom surface 258 of the recess.

[0255] In some embodiments, along the thickness direction Z of the body portion, the second step surface is closer to the electrode assembly 22 than the inner surface of the body portion 251 .

[0256] In the above solution, the second step surface is closer to the electrode assembly 22 than the inner surface of the body portion 251 , which can reduce the torsion of the first welding portion 280 caused by the force applied by the first seal 27 to the first wall 25 .

[0257] Please refer to Figures 14 and 15. Figure 14 is a schematic diagram of the assembly of the electrode terminal and the first wall according to other embodiments of the present application, and Figure 15 is a partial enlarged view of point D in Figure 14. According to some embodiments of the present application, the battery cell 20 further includes a second seal 30, which is disposed within the recess 253. The outer circumferential surface of the electrode terminal 23 has a first pressing surface 237. Along the radial direction J of the electrode terminal, the second seal 30 is configured to be sandwiched between the first pressing surface 237 and the inner circumferential surface 257 of the recess.

[0258] The second sealing member 30 is a member for forming a seal between the outer peripheral surface of the electrode terminal 23 and the inner peripheral surface 257 of the recessed portion.

[0259] The first pressing surface 237 is a portion of the outer peripheral surface of the electrode terminal 23 .

[0260] The inner peripheral surface 257 of the recess may be the inner surface of the peripheral wall 255 , that is, the surface of the peripheral wall 255 facing away from the interior of the battery cell 20 .

[0261] The second sealing member 30 is clamped by the first pressing surface 237 and the inner circumferential surface 257 of the recessed portion, respectively, so that the second sealing member 30 is in contact with the first pressing surface 237 and the inner circumferential surface 257 of the recessed portion.

[0262] In the above solution, a sealed connection is achieved between the electrode terminal 23 and the first wall 25 in the radial direction J of the electrode terminal, thereby improving the sealing effect between the electrode terminal 23 and the first wall 25 .

[0263] Please refer to Figure 15. According to some embodiments of the present application, the angle between the inner circumferential surface 257 of the recess and the bottom surface 258 of the recess is a first obtuse angle; the electrode terminal 23 has a second pressing surface 238, and along the thickness direction Z of the main body, the second pressing surface 238 is arranged opposite to the bottom surface 258 of the recess, the first pressing surface 237 is connected to the second pressing surface 238, and the angle between the first pressing surface 237 and the second pressing surface 238 is a second obtuse angle.

[0264] The inner circumferential surface 257 of the recess is inclined relative to the bottom surface 258 of the recess, so that the angle between the inner circumferential surface 257 of the recess and the bottom surface 258 of the recess is a first obtuse angle.

[0265] The second pressing surface 238 is disposed opposite to the bottom surface 258 of the recess, and the second pressing surface 238 may be perpendicular to the thickness direction Z of the main body. The first pressing surface 237 is connected to the second pressing surface 238, and the first pressing surface 237 is inclined relative to the second pressing surface 238, so that the angle between the first pressing surface 237 and the second pressing surface 238 is a second obtuse angle.

[0266] In some embodiments, a portion of the first sealing member 27 is clamped between the second pressing surface 238 and the bottom surface 258 of the recess.

[0267] In some embodiments, the first obtuse angle and the second obtuse angle may be equal or unequal.

[0268] In the above solution, the first pressing surface 237 is arranged at an angle, so that a larger sealing area is provided between the electrode terminal 23 and the inner peripheral surface 257 of the recess.

[0269] Referring to FIG. 3 , 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 25 serves as the end cover 212 .

[0270] In the above solution, the first wall 25 is the end cover 212 , which facilitates the assembly of the electrode terminal 23 .

[0271] In some embodiments, the end cap 212 , the electrode terminal 23 , the first insulating member 26 , the first sealing member 27 , the second sealing member 30 , and the connector 28 may be pre-assembled into an end cap 212 assembly to improve assembly efficiency of the battery cell 20 .

[0272] According to some embodiments of the present application, an embodiment of the present application provides a battery 100, which includes a battery cell 20 provided in any of the above embodiments.

[0273] According to some embodiments of the present application, an electrical device is further provided, which includes a battery cell 20 as provided in any of the above embodiments or a battery 100 as provided in any of the embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0274] The electrical equipment may be any of the above-mentioned devices or systems using the battery cell 20 or the battery 100 .

[0275] According to some embodiments of the present application, please refer to Figures 3 to 15. The embodiments of the present application provide a battery cell 20, which includes a shell 21, an electrode terminal 23, an electrode assembly 22, a adapter 24, a first insulating member 26, a first sealing member 27, a second insulating member 29, and a connecting member 28.

[0276] The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 seals the opening. The housing 211 includes a first wall 25, which serves as the end cap 212. The first wall 25 includes a main body 251 and a protrusion 252. The protrusion 252 protrudes from the inner surface of the main body 251. The outer surface of the first wall 25 has a recess 253 formed at a position corresponding to the protrusion 252. The protrusion 252 includes a bottom wall 254 and a peripheral wall 255 surrounding the bottom wall 254. The peripheral wall 255 connects the bottom wall 254 and the main body 251. The bottom wall 254 is provided with a first through hole 256.

[0277] The electrode assembly 22 is disposed in the housing 21 , and the electrode assembly 22 has a tab 221 .

[0278] The electrode terminal 23 includes a second portion 234, a first portion 233, and a third portion 236, which are sequentially arranged along the thickness direction Z of the body. The third portion 236 is closer to the electrode assembly 22 than the second portion 234. The first portion 233 is located within the recess 253, and a portion of the third portion 236 is disposed within the first through-hole 256. The diameter of the second portion 234 is smaller than that of the first portion 233. A first stepped surface 235 is formed between the second portion 234 and the first portion 233. A fourth stopper 232 is provided on the outer circumference of the second portion 234. The fourth stopper 232 extends to the first stepped surface 235 and is a second protrusion.

[0279] The first insulating member 26 includes a first insulating member body 261 and a first extension portion 262. Along the thickness direction Z of the body portion, the first insulating member body 261 is arranged between the first wall 25 and the adapter 24, and the first extension portion 262 is connected to the first insulating member body 261. In the radial direction J of the electrode terminal, a portion of the first extension portion 262 is located between the hole wall of the first through hole 256 and the electrode terminal 23, and a first gap Q1 is provided between the first extension portion 262 and the electrode terminal 23.

[0280] The first seal 27 includes a first seal body 271 and a second extension portion 272. Along the thickness direction Z of the main body, the first seal body 271 is arranged between the first part 233 and the bottom surface 258 of the recessed portion. The second extension portion 272 is connected to the first seal body 271 portion 251. In the radial direction J of the electrode terminal, a portion of the second extension portion 272 is located between the hole wall of the first through hole 256 and the electrode terminal 23. A second gap Q2 is present between the second extension portion 272 and the hole wall of the first through hole 256.

[0281] The connecting member 28 is annular and is sleeved onto the outside of the electrode terminal 23. The connecting member 28 includes a first connecting segment 282, a second connecting segment 283, and a third connecting segment 284. Along the radial direction J of the electrode terminal, the second connecting segment 283 is closer to the electrode terminal 23 than the first connecting segment 282. The first connecting segment 282 is welded to the first wall 25 to form a first welded portion 280. The inner circumference of the second connecting segment 283 is provided with a first stopper 281, which is a first groove.

[0282] The second insulating member 29 is annular and is sleeved onto the electrode terminal 23. A second stopper 291 is provided on the outer circumference of the second insulating member 29. The second stopper 291 is a first protrusion that fits into the first groove. A third stopper 292 is provided on the inner circumference of the second insulating member 29. The third stopper 292 is a second groove that fits into the second groove.

[0283] According to the battery cell 20 of the embodiment of the present application, the space inside the battery cell 20 is reasonably utilized, so that the energy density of the battery cell 20 can be improved.

[0284] 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, characterized in that: include: The housing includes a first wall, the first wall including a main body and a convex portion, the convex portion protruding from the inner surface of the main body, and a concave portion formed on the outer surface of the first wall at a position corresponding to the convex portion; an electrode terminal disposed on the first wall, wherein a portion of the electrode terminal is located in the recess; 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; In which, the adapter includes a first connecting portion connected to the tab, 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.

2. The battery cell according to claim 1, wherein: Along the first direction, a projection of the first connection portion at least partially overlaps with a projection of the electrode terminal.

3. The battery cell according to claim 1 or 2, characterized in that: The convex portion includes a bottom wall and a peripheral wall surrounding the bottom wall, the peripheral wall connecting 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 first through hole.

4. The battery cell according to claim 3, characterized in that The battery cell further includes a first insulating member. Along a thickness direction of the main body, at least a portion of the first insulating member is disposed between the first wall and the adapter.

5. The battery cell according to claim 4, characterized in that The first insulating member comprises: a first insulating member body, disposed between the first wall and the adapter along a thickness direction of the main body; The first extension portion is connected to the first insulating member 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.

6. The battery cell according to claim 5, characterized in that In a radial direction of the electrode terminal, a first gap is defined between the first extension portion and the electrode terminal.

7. The battery cell according to claim 5 or 6, characterized in that: The battery cell further includes a first sealing member, at least a portion of which is disposed between the electrode terminal and the bottom wall along a thickness direction of the body portion.

8. The battery cell according to claim 7, characterized in that The first sealing member comprises: a first sealing member body, disposed between the electrode terminal and the bottom wall along a thickness direction of the main body; The second extension portion is connected to the first sealing 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, characterized in that In a radial direction of the electrode terminal, a second gap is defined between the second extension portion and a hole wall of the first through hole.

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

11. The battery cell according to any one of claims 4 to 10, characterized in that: The first insulating member has a first insulating portion, and along the thickness direction of the main body, the projection of the first insulating portion overlaps with the projection of the bottom wall. The first insulating portion has a first surface facing away from the bottom wall, and the electrode terminal has a second surface closest to the interior of the battery cell, and the second surface is flush with the first surface.

12. The battery cell according to any one of claims 4 to 10, characterized in that: The first insulating member has a first insulating portion, a projection of the first insulating portion overlapping with a projection of the bottom wall along a thickness direction of the body portion, the first insulating portion having a first surface facing away from the bottom wall, and the electrode terminal protruding from the first surface along a direction of the bottom wall toward the first insulating portion; A recessed portion is formed on one side of the adapter facing the electrode terminal, and a portion of the electrode terminal is located in and connected to the recessed portion.

13. The battery cell according to any one of claims 4 to 10, characterized in that: The first insulating member has a first insulating portion, a projection of the first insulating portion overlapping a projection of the bottom wall along the thickness direction of the main body, the first insulating portion having a first surface facing away from the bottom wall, and the electrode terminal having a second surface closest to the interior of the battery cell, the second surface being closer to the bottom surface of the recess than the first surface; A protrusion is formed on one side of the adapter facing the electrode terminal, and a portion of the protrusion is located in the first through hole and connected to the second surface.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The battery cell further includes a connecting member in a ring shape. The connecting member is welded and fixed to the first wall to form a first welding portion. The connecting member is used to fix the electrode terminal to the first wall.

15. The battery cell according to claim 14, characterized in that The convex portion includes a bottom wall and a peripheral wall surrounding the bottom wall, wherein the peripheral wall connects the bottom wall and the main body; Along the thickness direction of the main body, a projection of the first welding portion at least partially overlaps with a projection of the peripheral wall.

16. The battery cell according to claim 14 or 15, characterized in that: The battery cell further includes a second insulating member connected to the connecting member and the electrode terminal, and the second insulating member is used to separate the connecting member and the electrode terminal.

17. The battery cell according to claim 16, characterized in that The connecting member is provided with a first limiting portion, and the second insulating member is provided with a second limiting portion. The first limiting portion cooperates with the second limiting portion to limit the circumferential rotation of the second insulating member relative to the connecting member.

18. The battery cell according to claim 17, characterized in that Along the thickness direction of the main body, a projection of the first limiting portion and / or the second limiting portion at least partially overlaps with a projection of the electrode terminal.

19. The battery cell according to claim 17 or 18, characterized in that: The first limiting portion is arranged on the inner circumferential surface of the connecting member.

20. The battery cell according to claim 19, characterized in that The connecting piece includes: a first connecting section, welded to the first wall to form the first welding portion; a second connecting section, located on an inner circumference of the first connecting section and further away from the interior of the housing than the first connecting section along a thickness direction of the main body; a third connecting segment, connecting the first connecting segment and the second connecting segment; Wherein, the first limiting portion is arranged on the inner circumferential surface of the second connecting section.

21. The battery cell according to any one of claims 17 to 20, characterized in that: 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.

22. The battery cell according to any one of claims 17 to 21, characterized in that: The second insulating member is provided with a third limiting portion, and the electrode terminal is provided with a fourth limiting portion. The third limiting portion cooperates with the fourth limiting portion to limit the circumferential rotation of the electrode terminal relative to the second insulating member.

23. The battery cell according to claim 22, characterized in that Along the radial direction of the electrode terminal, a projection of the third limiting portion at least partially overlaps with a projection of the second limiting portion.

24. The battery cell according to claim 22 or 23, characterized in that: The electrode terminal includes a first part and a second part, the first part is located in the recess, along the thickness direction of the main body, the second part is located on the side of the first part away from the interior of the battery cell, the diameter of the second part is smaller than the diameter of the first part, and the fourth limiting portion is arranged on the outer peripheral surface of the second part.

25. The battery cell according to claim 24, characterized in that A first step surface is formed between the second portion and the first portion, and the fourth limiting portion extends to the first step surface.

26. The battery cell according to claim 24 or 25, characterized in that: The fourth limiting portion is a second protrusion, and along the radial direction of the electrode terminal, the first portion protrudes from the second protrusion. The third limiting portion is a second groove, and at least a portion of the second protrusion is embedded in the second groove.

27. The battery cell according to any one of claims 24 to 26, characterized in that: The electrode terminal further includes a third portion, and along the thickness direction of the body portion, the third portion is located on a side of the first portion facing the interior of the battery cell; 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 part of the third portion is provided in the first through hole.

28. The battery cell according to any one of claims 1 to 27, characterized in that: The battery cell further includes a second sealant disposed in the recess. The outer circumferential surface of the electrode terminal has a first pressing surface. Along the radial direction of the electrode terminal, the second sealant is configured to be sandwiched between the first pressing surface and the inner circumferential surface of the recess.

29. The battery cell according to claim 28, characterized in that The angle between the inner circumferential surface of the recess and the bottom surface of the recess is a first obtuse angle; The electrode terminal has a second pressing surface, which is arranged opposite to the bottom surface of the recess along the thickness direction of the main body, the first pressing surface is connected to the second pressing surface, and the angle between the first pressing surface and the second pressing surface is a second obtuse angle.

30. The battery cell according to any one of claims 1 to 29, characterized in that: The housing includes a shell and an end cover, the shell has an opening, the end cover closes the opening, and the first wall serves as the end cover.

31. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 30.

32. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 30 or the battery according to claim 31, wherein the battery cell or the battery is used to provide electrical energy.

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