Housing assembly, battery cell, battery, and electrical apparatus

Abstract

A housing assembly, a battery cell, a battery, and an electrical apparatus. The housing assembly comprises a housing, a terminal post, and an insulating and sealing structure. The housing comprises a first housing wall, a first accommodation groove is formed in the first housing wall, and a mounting through hole is formed in the bottom wall of the first accommodation groove. The first terminal post comprises a terminal post body and a first extending platform, the first extending platform being arranged on the first housing wall on the side where the first accommodation groove is formed. The insulating and sealing structure comprises a first matching structure, the first matching structure is matched between the first housing wall and the first extending platform, and at least part of the first matching structure is accommodated in the first accommodation groove.

Description

Housing components, battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311532267.0 and application date of November 16, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a housing assembly, a battery cell, a battery, and an electrical device. Background Art

[0004] New energy vehicles have experienced rapid development in recent years. Within the electric vehicle sector, batteries, as the power source, play an irreplaceable and crucial role. Typically, batteries consist of multiple cells to provide the appropriate voltage and capacity for electric vehicles. However, increasing the energy density of these cells is difficult, hindering the range of electric vehicles and limiting the use cases of both the cells and the electric vehicles.

[0005] Summary of the Invention

[0006] The present application proposes a housing assembly, a battery cell, a battery, and an electrical device, which are beneficial to improving the energy density of the battery cell.

[0007] In a first aspect, an embodiment of the present application provides a shell assembly, comprising: a shell, the shell comprising a first shell wall, the first shell wall forming a first accommodating groove, the notch of the first accommodating groove being formed on the outer surface or inner surface of the first shell wall, and the bottom wall of the first accommodating groove being formed with a mounting through hole; a first pole, the first pole comprising a pole body passing through the mounting through hole, and a first extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole, the first extension platform being arranged on a side of the first shell wall where the first accommodating groove is formed; and an insulating sealing structure, the insulating sealing structure comprising a first mating structure, the first mating structure being mated between the first shell wall and the first extension platform, and at least a portion of the first mating structure being accommodated in the first accommodating groove.

[0008] In the above technical solution, by setting a first extension platform, the structural strength and installation reliability of the first pole can be increased; by accommodating at least part of the first matching structure in the first accommodating groove of the first shell wall, so that on the premise that the shell provides sufficient layout space for the battery cell assembly of the battery cell, the shell can also provide layout space for at least part of the first matching structure. The part of the first matching structure located in the first accommodating groove will not occupy the layout space provided by the shell for the battery cell assembly, or can reduce the occupied space of the shell assembly, which can improve the volume energy density of the battery cell.

[0009] In some embodiments, at least a portion of the first extension platform is received in the first receiving groove.

[0010] In the above technical solution, by arranging that at least part of the first extension platform is accommodated in the first accommodating groove, so that the shell provides sufficient layout space for the battery cell assembly, the shell can also provide layout space for at least part of the first extension platform, which is beneficial to further improve the volume energy density of the battery cell.

[0011] In some embodiments, on a plane perpendicular to the central axis of the mounting through hole, the orthographic projection of the first extension platform is located within the orthographic projection outer contour of the peripheral wall of the first receiving groove.

[0012] In the above technical solution, by being arranged on a plane perpendicular to the axial direction of the mounting through hole, the orthographic projection of the first extension platform is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove, so that at least the part of the first extension platform facing the bottom wall of the first accommodating groove can be accommodated in the first accommodating groove, and the first extension platform is not easy to interfere with the groove wall of the first accommodating groove, thereby facilitating the assembly of the first pole and the first shell wall; moreover, the above arrangement can also improve the assembly convenience of the first extension platform and the first shell wall when the first extension platform is completely accommodated in the first accommodating groove.

[0013] In some embodiments, the first extension platform is located at an axial end of the pole body, and a depth of the first receiving groove is greater than the sum of the thickness of at least part of the first matching structure and the first extension platform in the axial direction of the mounting through hole.

[0014] In the above technical solution, by arranging the first extension platform at the end of the pole body facing the inside of the shell, and the depth of the first accommodating groove is greater than the sum of the above-mentioned at least part of the first matching structure and the thickness of the first extension platform in the axial direction of the mounting through hole, it is beneficial to further increase the accommodating space of the first accommodating groove and improve the accommodating capacity of the first accommodating groove. Therefore, when the shell assembly is used for a battery cell, the first accommodating groove can also provide layout space for other components of the battery cell arranged on the side of the first extension platform away from the pole body or a part of other components arranged on the side of the first extension platform away from the pole body, so that the above-mentioned other components or a part of the above-mentioned other components can be accommodated in the first accommodating groove, so as to make more layout space for the battery cell assembly or other components outside the shell, which is beneficial to further improve the volume energy density of the battery cell or improve the volume energy density of the battery.

[0015] In some embodiments, the first shell wall includes a main body and a accommodating portion, the main body is arranged around the accommodating portion, the accommodating portion includes an end wall and a side wall, the end wall and the side wall are arranged to form a first accommodating groove, the mounting through hole is formed on the end wall, and the side surface of the end wall facing away from the side wall protrudes from the surface of the main body.

[0016] In the above technical solution, the first shell wall includes a main body and a receiving portion, the main body is arranged around the receiving portion, and the receiving portion defines a first receiving groove, so that the first receiving groove is spaced apart from the outer peripheral edge of the first shell wall, so that the receiving portion can be processed by clamping and fixing the main body, thereby improving the processing convenience; at the same time, since the side surface of the end wall facing away from the side wall is protruding from the surface of the main body, it is conducive to appropriately increasing the thickness of the end wall and improving the structural strength of the end wall, thereby improving the installation reliability of the first pole, and at the same time, it can also reduce the difference between the thickness of the end wall and the thickness of the main body, thereby improving the balance of the structural strength of the first shell wall.

[0017] In some embodiments, the thickness of the end wall and the thickness of the side wall are both greater than or equal to the thickness of the body portion.

[0018] In the above technical solution, by setting the thickness of the end wall and the thickness of the side wall to be greater than or equal to the thickness of the main body, the difference between the wall thickness of the accommodating portion and the wall thickness of the main body can be further reduced. At the same time, the distribution of the material corresponding to the first shell wall can be made more reasonable, which is conducive to improving the installation reliability of the first pole.

[0019] In some embodiments, the main body portion and the receiving portion are an integral structure formed by stamping or stretching.

[0020] In the above technical solution, by setting the main body and the accommodating part as an integrated structure formed by stamping and stretching, the processing and forming of the first shell wall is facilitated. At the same time, there is no need to set a connecting structure between the main body and the accommodating part, so as to simplify the structure of the first shell wall and reduce the occupation of the first shell wall by the internal space or external space of the shell.

[0021] In some embodiments, a minimum distance between an outer periphery of the receiving portion and an outer periphery of the main body portion is greater than 0.5 mm.

[0022] In the above technical solution, by setting the minimum distance between the outer peripheral edge of the accommodating part and the outer peripheral edge of the main body to be greater than 0.5 mm, the main body can be pressed during the forming process of the accommodating part to achieve sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating part, and at the same time helping to improve the regularity of the shape of the accommodating part, and not easily causing deformation of the main body.

[0023] In some embodiments, the housing further includes a second housing wall adjacent to the first housing wall, and at least a portion of an outer surface of the body portion is formed as a rounded surface, which is connected to an outer surface of the second housing wall.

[0024] In the above technical solution, by setting at least a portion of the outer surface of the main body to be formed as a rounded surface, it is convenient to make the minimum distance between the inner peripheral edge and the outer peripheral edge of the main body in the radial direction of the mounting through hole greater than or equal to the radial width of the rounded surface, so that the part of the main body connected to the accommodating portion and surrounding the accommodating portion reserves the radial width of the rounded surface for the accommodating portion, so that during the forming process of the accommodating portion, the main body can be pressed to achieve sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating portion.

[0025] In some embodiments, the main body portion includes a flat portion and a rounded portion, the flat portion is connected to the second shell wall via the rounded portion, and an outer surface of the rounded portion is formed as a rounded surface.

[0026] In the above technical solution, by setting the main body to include a flat part and a rounded part, the flat part is connected to the second shell wall through the rounded part, which is conducive to appropriately increasing the minimum width of the part of the main body located between the outer peripheral edge of the accommodating part and the corresponding second shell wall, so that during the pressing operation, the main body can provide a larger pressing width, so as to further improve the convenience of pressing.

[0027] In some embodiments, the first shell wall includes a main body and a accommodating portion, the main body is arranged around the accommodating portion, the accommodating portion includes an end wall and a side wall, the end wall and the side wall are arranged to form a first accommodating groove, the mounting through hole is formed on the end wall, and the side surface of the end wall facing away from the side wall is arranged flush with the surface of the main body.

[0028] In the above technical solution, the main body is arranged around the accommodating portion, which also facilitates processing of the accommodating portion by clamping and fixing the main body, thereby improving processing convenience; and since the surface of the side of the end wall facing away from the side wall is flush with the surface of the main body, the material used for the first shell wall can be saved and the cost can be reduced while the first pole is reliably installed.

[0029] In some embodiments, the notch of the first accommodating groove is formed on the inner surface of the first shell wall, and in the radial direction of the mounting through hole, the first matching structure is spaced apart from the outer peripheral edge of the first extension platform. The shell assembly also includes: an insulating structure, which is arranged at the outer peripheral edge of the first extension platform and is at least partially matched between the first extension platform and the first shell wall.

[0030] In the above technical solution, the first matching structure and the outer peripheral edge of the first extension platform are spaced apart in the radial direction of the mounting through hole. Since the first matching structure is not only used for insulation but also for sealing, it is beneficial to reduce the difficulty of installing the first matching structure under the premise of achieving a sealed setting between the first pole and the first shell wall; and an insulating structure is provided at the outer peripheral edge of the first extension platform, and at least part of the insulating structure is matched between the first extension platform and the first shell wall to improve the insulation reliability between the first extension platform and the first shell wall, reduce the risk of short circuit caused by easy contact between the outer peripheral edge of the first extension platform and the first shell wall due to large deformation of the first matching structure, and improve the safety of the battery cell.

[0031] In some embodiments, on a plane perpendicular to the central axis of the mounting through hole, the orthographic projection of the first extension platform is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove, and the insulating structure includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion being fitted between the bottom wall of the first accommodating groove and the first extension platform, and the second insulating portion being arranged around the first extension platform and covering at least a portion of the outer peripheral wall of the first extension platform.

[0032] In the above technical solution, an insulating structure including a first insulating part and a second insulating part is provided to enhance the insulating protection effect of the insulating structure on the first extension platform, reduce the risk of contact between the first extension platform and the peripheral wall and bottom wall of the first accommodating groove, and further enhance the insulation reliability between the first extension platform and the first shell wall.

[0033] In some embodiments, the shell assembly further includes: a bracket, which is disposed inside the shell and is suitable for cooperating with the battery cell assembly of the battery cell to separate the active material coating portion of the battery cell assembly from the first shell wall, wherein the bracket and the insulating structure are an integral part; or, the bracket and the insulating structure are separate parts and are connected.

[0034] In the above technical solution, a bracket is provided in the shell so that when the shell assembly is used in a battery cell, the bracket can separate the active material coating portion from the first shell wall, thereby improving the reliability and assembly convenience of the battery cell. The bracket and the insulation structure are flexibly provided to better adapt to the differentiated requirements of the battery cell.

[0035] In some embodiments, the first pole also includes a second extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole, the second extension platform and the first extension platform extend to the inner and outer sides of the first shell wall respectively, and the insulating sealing structure includes a second mating structure, and the second mating structure is mated between the first shell wall and the second extension platform.

[0036] In the above technical solution, the first pole is also provided with a second extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole. The second extension platform and the first extension platform extend to the inner and outer sides of the first shell wall respectively, so that the first pole is limited and matched at the mounting through hole through the first extension platform and the second extension platform, which is beneficial to improving the installation reliability of the first pole. At the same time, insulation and sealing between the first shell wall and the second extension platform are achieved through the second matching structure, thereby improving the reliability of the battery cell.

[0037] In some embodiments, the first shell wall is also formed with a second accommodating groove, the groove opening of the first accommodating groove is formed on the inner surface of the first shell wall, the groove opening of the second accommodating groove is formed on the outer surface of the first shell wall, the second extension platform extends to the outside of the outer surface of the first shell wall, and at least part of the second mating structure is accommodated in the second accommodating groove.

[0038] In the above technical solution, by accommodating at least part of the second matching structure in the second accommodating groove, it is beneficial to simultaneously reduce the occupation of the first matching structure and the second matching structure in the layout space provided for the battery cell assembly inside the shell, and reduce the occupation of the first matching structure and the second matching structure in the space outside the shell, thereby facilitating further improving the volume energy density of the battery cell.

[0039] In a second aspect, an embodiment of the present application provides a battery cell, comprising the above-mentioned shell assembly and cell assembly, the cell assembly comprising an active material coating portion and a conductive portion, the active material coating portion being disposed within the shell, and the conductive portion electrically connecting the active material coating portion with the first pole.

[0040] In the above technical solution, the battery cell adopts the above shell assembly, which can improve the volume energy density and usage reliability of the battery cell.

[0041] In some embodiments, the active material coating portion includes a current collector and an active material layer provided on the current collector, the conductive portion includes a pole ear portion electrically connected to the current collector, the pole ear portion includes a plurality of pole ear sheets, the plurality of pole ear sheets converge at a position close to the current collector to form a first gathered portion, the plurality of pole ear sheets converge and connect at a position away from the current collector to form a second gathered portion, the first gathered portion connects the second gathered portion and the active material coating portion, the notch of the first accommodating groove is formed on the inner surface of the first shell wall, and at least a portion of the second gathered portion is accommodated in the first accommodating groove.

[0042] In the above technical solution, a second gathered portion is formed by arranging multiple pole tabs to converge near the current collector, and at least part of the second gathered portion is accommodated in the first accommodating groove, so as to reduce the pole tab portion's occupation of the layout space provided for the battery cell assembly inside the shell, which is beneficial to further improve the volume energy density of the battery cell.

[0043] In some embodiments, the conductive portion further includes an adapter plate, which is connected to the second retracted portion. The conductive portion is electrically connected to the first pole via the adapter plate, and at least a portion of the adapter plate is accommodated in the first accommodation groove.

[0044] In the above technical solution, a second folding portion is provided to be indirectly electrically connected to the first pole through an adapter plate, and at least a portion of the adapter plate is accommodated in the first accommodating groove, so as to reduce the occupation of the conductive portion by the layout space provided for the battery cell assembly inside the shell, which is conducive to further improving the volume energy density of the battery cell.

[0045] In some embodiments, a portion of the first gathered portion is received in the first receiving groove.

[0046] In the above technical solution, by accommodating a portion of the first folded portion in the first accommodating groove, the occupation of the pole ear portion on the layout space provided for the battery cell assembly inside the shell is further reduced, which is beneficial to further improve the volume energy density of the battery cell.

[0047] In some embodiments, the active material coating portion includes a current collector and an active material layer provided on the current collector, the conductive portion includes a pole ear portion and a transition piece, the pole ear portion includes a plurality of pole ear pieces electrically connected to the current collector, the plurality of pole ear pieces converge at a position close to the current collector to form a first gathered portion, the plurality of pole ear pieces converge and connect at a position away from the current collector to form a second gathered portion, the transition piece is electrically connected to the second gathered portion, the notch of the first accommodating groove is formed on the inner surface of the first shell wall, at least a portion of the transition piece is accommodated in the first accommodating groove and is electrically connected to the first pole.

[0048] In the above technical solution, at least a portion of the adapter is accommodated in the first accommodating groove to reduce the occupation of the conductive part in the arrangement space provided for the battery cell assembly inside the shell, which is conducive to further improving the volume energy density of the battery cell.

[0049] In some embodiments, the first pole is formed with a third receiving groove, the groove opening of the third receiving groove is formed on the side surface of the first pole away from the active material coating portion, the third receiving groove is connected to the interior of the shell through a through hole, the conductive portion is passed through the through hole and is at least partially received in the third receiving groove.

[0050] In the above technical solution, the provision of a third receiving groove helps reduce the weight of the first terminal, thereby increasing the weight energy density of the battery cell. Furthermore, because the notch of the third receiving groove is formed on the outer end surface of the terminal, when at least a portion of the conductive portion is accommodated within the third receiving groove, the notch facilitates storage and arrangement of the conductive portion, as well as electrical connection between the conductive portion and the first terminal, thereby reducing the difficulty of battery cell production. Furthermore, because the third receiving groove is connected to the interior of the housing through a perforation, it can also serve as a buffer and temporary storage structure for electrolyte, allowing the housing to hold more electrolyte. Since electrolyte is lost during the charging and discharging process of the battery cell, having more electrolyte can extend the battery cell's service life. Furthermore, because the third receiving groove is connected to the interior of the housing through a perforation, it can also serve as a storage and buffer structure for gas generated within the battery cell assembly, thereby reducing expansion of the battery cell.

[0051] In a third aspect, an embodiment of the present application provides a battery comprising the above-mentioned battery cell.

[0052] In the above technical solution, the battery adopts the above battery cells, which can improve the energy density and reliability of the battery.

[0053] In some embodiments, there are multiple battery cells, and the first pole is arranged to protrude from the outer surface of the first shell wall. The battery also includes a busbar component, which includes a buffer portion and two connecting portions. The two connecting portions are electrically connected to the first poles of the two battery cells respectively. The buffer portion is connected between the two connecting portions, and at least part of the buffer portion protrudes toward the shell relative to the connecting portion and can be stretched and deformed.

[0054] In the above technical solution, by setting at least a portion of the buffer portion to be stretchable and deformable, the busbar component can relieve the stress caused by the expansion of the battery cell during the use of the battery, and at least a portion of the buffer portion can undergo a certain degree of stretching and deformation following the expansion of the battery cell, so as to reduce the pulling of the busbar component on the first pole, and also reduce the tensile force borne by the busbar component, thereby reducing the risk of the busbar component being broken by double pulling, and improving the reliability of the battery; and by setting at least a portion of the buffer portion to protrude toward the shell relative to the connecting portion, so that the first pole of each of the two battery cells protrudes from the corresponding portion of the shell, the space corresponding to the buffer portion is used to jointly accommodate at least a portion of the buffer portion, which is beneficial to reducing the space occupied by the battery and further facilitating the improvement of the volume energy density of the battery.

[0055] In a fourth aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery.

[0056] In the above technical solution, the electric device adopts the above battery, which can improve the endurance and reliability of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0059] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0060] FIG3 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0061] FIG4 is a schematic structural diagram of a housing assembly provided in some embodiments of the present application;

[0062] FIG5 is another schematic diagram of the housing assembly shown in FIG4 ;

[0063] FIG6 is a cross-sectional view along line AA in FIG5;

[0064] FIG7 is an enlarged view of the circled portion B in FIG6 ;

[0065] FIG8 is a schematic diagram of the housing shown in FIG4 ;

[0066] FIG9 is a partial cross-sectional view of the housing shown in FIG8 ;

[0067] FIG10 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0068] FIG11 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0069] FIG12 is an enlarged view of the circled portion C in FIG11 ;

[0070] FIG13 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0071] FIG14 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0072] FIG15 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0073] FIG16 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0074] FIG17 is a partial schematic diagram of a battery provided in some embodiments of the present application;

[0075] FIG18 is another partial schematic diagram of the battery shown in FIG17 ;

[0076] FIG. 19 is another schematic diagram of the battery shown in FIG. 17 .

[0077] Reference numerals:

[0078] 1000, electric device, controller, motor, motor, battery, battery cell, battery pack, housing, housing, first housing, first housing, second housing, current collector, current collector, buffer, connection, housing assembly, housing, housing, housing body, housing, cover, first housing wall, first receiving groove, first receiving groove, first mounting hole, first mounting hole, center axis L of first receiving groove, main body, flat portion, rounded portion, first corner, first rounded surface, first receiving groove, first receiving groove, first end wall, first side wall, first terminal, first receiving groove, first through hole, first through hole, first receiving groove ... The pole body 121, the first extension platform 122, the second extension platform 123, the pole cover 124, the insulating sealing structure 13, the first matching structure 131, the second matching structure 132, the insulating structure 14, the first insulating part 141, the second insulating part 142, the bracket 15, the explosion-proof valve 16, the battery cell assembly 20, the active material coating part 21, the current collector 211, the active material layer 212, the conductive part 22, the pole ear part 221, the first gathering part 2211, the second gathering part 2212, and the adapter 222. DETAILED DESCRIPTION

[0079] 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 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.

[0080] 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 for the purpose of describing specific embodiments only 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.

[0081] 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.

[0082] 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.

[0083] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0084] The term "plurality" used in this application refers to two or more (including two).

[0085] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0086] The battery referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or battery pack. A battery module generally includes multiple battery cells. A battery generally includes a casing for enclosing multiple battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, the battery may also not include a casing.

[0087] For example, a battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and a separator. The housing can be made of, but is not limited to, aluminum.

[0088] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. For example, the stacked multiple positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection. Alternatively, the battery cell assembly may further include a positive electrode adapter. The stacked multiple positive electrode tabs are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode column to form an electrical connection between the positive electrode tab and the positive electrode column.

[0089] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. For example, the multiple stacked negative electrode tabs can be directly welded to the negative electrode column to form an electrical connection; alternatively, the battery cell assembly can further include a negative electrode adapter. The multiple stacked negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode column to form an electrical connection between the negative electrode tab and the negative electrode column. The material of the separator is not limited, and can be, for example, polypropylene or polyethylene.

[0090] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As core components of new energy vehicles, batteries have high requirements in terms of both energy density and reliability.

[0091] In the related art, the pole of the battery cell is installed in the shell, and part of the pole extends into the shell, and / or part of the pole extends out of the shell, and the pole and the shell usually need to be insulated and sealed, which easily makes the height space occupied by the pole larger, and the energy density of the battery cell difficult to improve.

[0092] Based on the above considerations, in order to suppress the thermal diffusion of the battery, a shell assembly is proposed, which includes a shell, a pole and an insulating sealing structure. The shell includes a first shell wall, the first shell wall is formed with a first accommodating groove, the notch of the first accommodating groove is formed on the outer surface or the inner surface of the first shell wall, and the bottom wall of the first accommodating groove is formed with a mounting through hole. The first pole includes a pole body passing through the mounting through hole, and a first extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole. The first extension platform is arranged on a side of the first shell wall where the first accommodating groove is formed. The insulating sealing structure includes a first matching structure, the first matching structure is matched between the first shell wall and the first extension platform, and at least a portion of the first matching structure is accommodated in the first accommodating groove.

[0093] In the above technical solution, by setting a first extension platform, the structural strength and installation reliability of the first pole can be increased; by accommodating at least part of the first matching structure in the first accommodating groove of the first shell wall, so that on the premise that the shell provides sufficient layout space for the battery cell assembly of the battery cell, the shell can also provide layout space for at least part of the first matching structure. The part of the first matching structure located in the first accommodating groove will not occupy the layout space provided by the shell for the battery cell assembly, or can reduce the occupied space of the shell assembly, which can improve the volume energy density of the battery cell.

[0094] The embodiments of the present application provide an electric device using the battery disclosed herein as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. Among them, 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. The electric tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0095] For the convenience of description, the following embodiments take the electric device 1000 as a vehicle as an example, and describe in detail the structures of the electric device 1000, the battery 200 and the battery cell 100 of the present application.

[0096] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 200, and the battery 200 can be arranged at the bottom, head or tail of the vehicle. The battery 200 can be used to power the vehicle, for example, the battery 200 can be used as an operating power source for the vehicle. The vehicle may also include a controller 300 and a motor 400, and the controller 300 is used to control the battery 200 to power the motor 400, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 200 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0097] Please refer to Figure 2, which is an exploded view of the structure of the battery cell 100 used in the battery 200 provided in some embodiments of the present application. The battery 200 includes a housing 101 and a plurality of battery cells 100, and the battery cells 100 are accommodated in the housing 101. The housing 101 is used to provide an assembly space for the battery cells 100, and the housing 101 can adopt a variety of structures. In some embodiments, the housing 101 can include a first housing 101a and a second housing 101b, and the first housing 101a and the second housing 101b cover each other, and the first housing 101a and the second housing 101b jointly define a storage space for accommodating the battery cells. The second box 101b can be a hollow structure with one end open, and the first box 101a can be a plate-like structure. The first box 101a covers the open side of the second box 101b, so that the first box 101a and the second box 101b jointly define a storage space; alternatively, the first box 101a and the second box 101b can both be hollow structures with one end open (for example, as shown in FIG. 2 ), with the open side of the first box 101a covering the open side of the second box 101b. Of course, the box 101 formed by the first box 101a and the second box 101b can be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0098] In the battery 200, multiple battery cells 100 can 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 100. Multiple battery cells 100 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 100 can be housed within the housing 101. Alternatively, the battery 200 can be constructed by first connecting multiple battery cells 100 in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within the housing 101. The battery 200 may also include other structures. For example, the battery 200 may also include a busbar 102 for electrically connecting the multiple battery cells 100.

[0099] Referring to Figures 3 and 4 , the battery cell is a rectangular parallelepiped, with the height direction of the battery cell being the third direction Z, the length direction of the battery cell being the first direction X, and the thickness direction of the battery cell being the second direction Y. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. However, this is not limiting. In other embodiments of the present application, the battery cell may also be cylindrical, polygonal, flat, or in other shapes.

[0100] 4 to 7 and 10 , in the embodiment of the present application, the housing assembly 10 includes a housing 11 and a first pole 12 provided on the housing 11 .

[0101] The shell 11 is provided with a pole, which is used to electrically connect to the battery cell assembly 20 of the battery cell 100 to achieve normal charging and discharging of the battery cell 100; generally, the number of poles is at least two, including at least one positive pole and at least one negative pole. In the embodiment of the present application, at least one pole among the multiple poles on the shell 11 is a first pole 12, and the first pole 12 can be used as a positive pole or a negative pole. The first pole 12 is a pole configured to include a pole body 121 and a first extension platform 122; that is, all poles on the shell 11 are formed as first poles 12, or a part of the poles on the shell 11 are formed as first poles 12, and the remaining poles on the shell 11 are formed as second poles, and the second poles have a different structure from the first pole 12. For ease of description, the following description of the present application takes the example of all poles on the shell 11 being first poles 12.

[0102] The shell 11 includes a first shell wall 111, which is formed with a first accommodating groove 111a. The notch of the first accommodating groove 111a is formed on the outer surface of the first shell wall 111 (as shown in Figure 10), or the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111 (as shown in Figures 7 and 9). The bottom wall of the first accommodating groove 111a is formed with a mounting through hole 111b. The bottom wall of the first accommodating groove 111a can be understood as the groove wall on one side of the first accommodating groove 111a opposite to its notch. The mounting through hole 111b passes through the bottom wall of the first accommodating groove 111a to connect the inside and outside of the shell 11.

[0103] It can be seen that the first receiving groove 111a can be located on the outside of the first shell wall 111, or the first receiving groove 111a can be located on the inside of the first shell wall 111. For example, when the first shell wall 111 is the top wall of the shell 11, the outer surface of the first shell wall 111 is the upper surface of the first shell wall 111, and the inner surface of the first shell wall 111 is the lower surface of the first shell wall 111. When the notch of the first receiving groove 111a is formed on the outer surface of the first shell wall 111, the first receiving groove 111a is located on the outside of the first shell wall 111, and the first receiving groove 111a can be a groove with an upward opening and a downward recessed groove wall. Alternatively, when the notch of the first receiving groove 111a is formed on the inner surface of the first shell wall 111, the first receiving groove 111a is located on the inside of the first shell wall 111, and the first receiving groove 111a can be a groove with an downward opening and a downward recessed groove wall. Of course, the first shell wall 111 can also be a side wall or bottom wall of the shell 11.

[0104] 6 and 7 , the first pole 12 includes a pole body 121 and a first extension platform 122. The pole body 121 is disposed in the mounting hole 111b, that is, at least a portion of the pole body 121 is located in the mounting hole 111b. With the axial direction of the mounting hole 111b as the projection direction and the plane perpendicular to the axial direction of the mounting hole 111b as the projection plane, the projection of the pole body 121 on the projection plane falls within the projection range of the hole wall of the mounting hole 111b on the projection plane, thereby enabling the pole body 121 to be disposed in the mounting hole 111b. The first extension platform 122 is connected to the pole body 121 and extends relative to the pole body 121 in a direction away from the central axis L of the mounting hole 111b. For example, the first extension platform 122 may extend in the radial direction of the mounting hole 111b and in a direction away from the central axis L of the mounting hole 111b. The first extension platform 122 is disposed on a side of the first housing wall 111 where the first accommodating groove 111a is formed. Exemplarily, the notch of the first accommodating groove 111a is formed on the outer surface of the first shell wall 111, and the first extension platform 122 is arranged on the outer side of the first shell wall 111 and can extend to the outside of the outer surface of the first shell wall 111; or, the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, and the first extension platform 122 is arranged on the inner side of the first shell wall 111 and can extend to the inside of the inner surface of the first shell wall 111.

[0105] It can be seen that the provision of the first extension platform 122 can, to a certain extent, increase the overall structural strength of the first pole 12 and improve the reliability of the first pole 12. At the same time, it is beneficial to increase the matching area between the first pole 12 and the first shell wall 111, improve the matching reliability of the first pole 12 and the first shell wall 111, and thus improve the installation reliability of the first pole 12.

[0106] The two side surfaces of the first shell wall 111 in the wall thickness direction are the outer surface and the inner surface, respectively. A receiving cavity is formed within the housing 11, and the active material coating portion 21 of the battery cell can be received in the receiving cavity. The inner surface is the surface of the first shell wall 111 facing the receiving cavity, and the outer surface is the surface of the first shell wall 111 facing away from the receiving cavity. The side of the outer surface facing away from the receiving cavity is the outer side of the outer surface, and the side of the inner surface facing the receiving cavity is the inner side of the inner surface. "The first extension 122 extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall 111" means that at least a portion of the first extension 122 directly faces the first shell wall 111, with the axial direction of the mounting hole 111b as the projection direction and the plane perpendicular to the axial direction of the mounting hole 111b as the projection plane. The projection of the first extension 122 on the projection plane and the projection of the first shell wall 111 on the projection plane have an intersection area, and the portion of the first extension 122 corresponding to the intersection area directly faces the first shell wall 111.

[0107] Exemplarily, in combination with Figure 7, the first shell wall 111 is the top wall of the shell body 11. If the notch of the first accommodating groove 111a is formed on the upper surface of the first shell wall 111, the first extension platform 122 extends to the upper side of the upper surface of the first shell wall 111, and if the notch of the first accommodating groove 111a is formed on the lower surface of the first shell wall 111, the first extension platform 122 extends to the lower side of the lower surface of the first shell wall 111.

[0108] It can be understood that in the embodiment of the present application, there can be one first pole 12 on the first shell wall 111, in which case the first shell wall 111 can be multiple; or, there can be multiple first poles 12 on a single first shell wall 111, in which case the first shell wall 111 can be one or more.

[0109] 6 and 7 , in the embodiment of the present application, the housing assembly 10 further includes an insulating sealing structure 13, which includes a first mating structure 131. The first mating structure 131 is mated between the first housing wall 111 and the first extension platform 122. It can be seen that the first mating structure 131 is sandwiched between the first housing wall 111 and the first extension platform 122, so that the first housing wall 111 and the first extension platform 122 can be indirectly mated via the first mating structure 131 to achieve insulation and sealing between the first housing wall 111 and the first extension platform 122.

[0110] In which, at least a portion of the first matching structure 131 is accommodated in the first accommodating groove 111a; that is, the first matching structure 131 can be fully accommodated in the first accommodating groove 111a, or a portion of the first matching structure 131 is accommodated in the first accommodating groove 111a.

[0111] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the side surface of the above-mentioned at least part of the first matching structure 131 (i.e., the part of the first matching structure 131 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the side surface of the above-mentioned at least part of the first matching structure 131 facing away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than or equal to the depth H of the first accommodating groove 111a; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the first matching structure 131 is less than or equal to the depth H of the first accommodating groove 111a. For example, when the thickness of the entire first matching structure 131 is less than or equal to the depth H of the first accommodating groove 111a, the entire first matching structure 131 can be accommodated in the first accommodating groove 111a; when the thickness of the entire first matching structure 131 is greater than the depth H of the first accommodating groove 111a, a part of the first matching structure 131 is accommodated in the first accommodating groove 111a.

[0112] Exemplarily, in combination with Figures 6 and 7, the first shell wall 111 is the top wall of the shell body 11, and the notch of the first accommodating groove 111a is formed on the lower surface of the first shell wall 111. At this time, the bottom wall of the first accommodating groove 111a is located above the notch of the first accommodating groove 111a. The distance between the notch of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a in the up and down directions is the depth H of the first accommodating groove 111a. The thickness of the first matching structure 131 in the up and down directions is less than the depth H of the first accommodating groove 111a (as shown in Figure 13), or the thickness of the first matching structure 131 in the up and down directions is greater than the depth H of the first accommodating groove 111a (as shown in Figure 12); of course, the notch of the first accommodating groove 111a can also be formed on the upper surface of the first shell wall 111, and the above-mentioned at least part of the first matching structure 131 and the first extension platform 122 are both arranged on the upper side of the first shell wall 111.

[0113] In the above technical solution, by accommodating at least part of the first matching structure 131 in the first accommodating groove 111a, so that on the premise that the shell 11 provides sufficient layout space for the battery cell assembly 20 of the battery cell 100, the shell 11 can also provide layout space for at least part of the first matching structure 131. The part of the first matching structure 131 located in the first accommodating groove 111a will not occupy the layout space provided by the shell 11 for the battery cell assembly 20, or can reduce the occupied space of the shell assembly 10 without excessively increasing it.

[0114] For example, by setting a first accommodating groove 111a on the inner side of the first shell wall 111 for accommodating at least part of the first matching structure 131, the occupation of the layout space provided by the shell 11 for the battery cell assembly 20 by the first matching structure 131 can be reduced, so that a larger battery cell assembly 20 can be accommodated in the shell 11, which is beneficial to improving the volume energy density of the battery cell 100; especially when the first pole 12 protrudes from the main structural part of the first shell wall 111 (for example, including the main body 1111 described below) and the height of the first pole 12 protruding from the main structural part of the first shell wall 111 is fixed, setting the first accommodating groove 111a on the inner side of the first shell wall 111 to accommodate at least part of the first matching structure 131 is obviously beneficial to improving the energy density.

[0115] For another example, when the size of the arrangement space provided for the battery cell assembly 20 inside the shell 11 is fixed, by setting a first accommodating groove 111a on the outside of the first shell wall 11 to accommodate at least part of the first matching structure 131, the occupation of the external space of the shell 11 by the first matching structure 131 can be reduced. For example, when the first pole 12 protrudes from the outer surface of the first shell wall 11, it is beneficial to reduce the height of the first pole 12 protruding from the first shell wall 11, and then reduce the occupied space of the shell assembly 10 and the occupied space of the battery cell 100, which is also beneficial to improve the volume energy density of the battery cell 10. Then, the battery 100 of the same volume can accommodate a larger number of battery cells 10, thereby improving the volume energy density of the battery 100.

[0116] Referring to Figure 13 , in some embodiments, at least a portion of the first extension platform 122 is accommodated within the first receiving groove 111a. That is, the first extension platform 122 may be entirely accommodated within the first receiving groove 111a, or a portion of the first extension platform 122 may be accommodated within the first receiving groove 111a. In this embodiment, the notch of the first receiving groove 111a may be formed on the inner surface of the first shell wall 111, with the first extension platform 122 disposed on the inner side of the first shell wall 111, as shown in Figure 13 . Alternatively, the notch of the first receiving groove 111a may be formed on the outer surface of the first shell wall 111, in which case the first extension platform 122 is disposed on the outer side of the first shell wall 111, with at least a portion of the first extension platform 122 accommodated within the first receiving groove 111a.

[0117] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the side surface of the above-mentioned at least part of the first extension platform 122 (i.e., the part of the first extension platform 122 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the side surface of the above-mentioned at least part of the first extension platform 122 facing away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than or equal to the depth H of the first accommodating groove 111a; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the first extension platform 122 is less than or equal to the depth H of the first accommodating groove 111a. For example, when the thickness of the entire first extension platform 122 is less than or equal to the depth H of the first accommodating groove 111a, the entire first extension platform 122 can be accommodated in the first accommodating groove 111a; when the thickness of the entire first extension platform 122 is greater than the depth H of the first accommodating groove 111a, a portion of the first extension platform 122 is accommodated in the first accommodating groove 111a.

[0118] In the above technical solution, by arranging at least a portion of the first extension platform 122 to be accommodated in the first accommodating groove 111a, so that the shell 11 provides sufficient layout space for the battery cell assembly 20, the shell 11 can also provide layout space for at least a portion of the first extension platform 122, so as to free up more layout space for the battery cell assembly 20, or further reduce the occupied space of the shell assembly 10, which is conducive to further improving the volume energy density of the battery cell 100.

[0119] For example, by setting a first accommodating groove 111a on the inner side of the first shell wall 111 for accommodating at least part of the first matching structure 131 and at least part of the first extension platform 122, the occupation of the layout space provided by the shell 11 for the battery cell assembly 20 by the first matching structure 131 and the first pole 12 can be reduced, so as to further enable the shell 11 to accommodate larger-sized battery cell assemblies 20, which is beneficial to further improve the volume energy density of the battery cell 10; especially when the first pole 12 protrudes from the main structure part of the first shell wall 111 and the height of the first pole 12 protruding from the main structure part of the first shell wall 111 is fixed, it is obviously beneficial to further improve the energy density.

[0120] For another example, when the size of the arrangement space provided for the battery cell assembly 20 inside the shell 11 is fixed, by setting a first accommodating groove 111a on the outside of the first shell wall 11 to accommodate at least part of the first matching structure 131 and at least part of the first extension platform 122, the occupation of the external space of the shell 11 by the first matching structure 131 and the first pole 12 can be reduced. For example, when the first pole 12 protrudes from the outer surface of the first shell wall 111, it is beneficial to further reduce the height of the first pole 12 protruding from the first shell wall 11, and then further reduce the occupied space of the battery cell 100, which is also beneficial to improve the volume energy density of the battery cell 10.

[0121] For example, in the thickness direction of the first housing wall 111, the thickness of at least a portion of the first mating structure 131 is less than the depth H of the first receiving groove 111a, so that at least a portion of the first extension 122 is accommodated within the first receiving groove 111a. Of course, the method for accommodating at least a portion of the first extension 122 within the first receiving groove 111a is not limited to this. For example, due to design requirements, the first extension 122 may form a protrusion on the side of the first extension 122 facing the first housing wall 111. The protrusion and the first mating structure 131 are sequentially arranged along the radial direction of the mounting hole 111b. To improve the energy density of the battery cell, the distance between the side of the protrusion facing the bottom wall of the first receiving groove 111a and the bottom wall of the first receiving groove 111a is less than the depth H of the first receiving groove 111a, so that at least a portion of the protrusion is accommodated within the first receiving groove 111a. In this case, the thickness of at least a portion of the first mating structure 131 may be less than, equal to, or greater than the depth H of the first receiving groove 111a.

[0122] In other embodiments of the present application, when the at least portion of the first mating structure 131 is accommodated within the first receiving groove 111a, the first extension platform 122 may also be configured to not be accommodated within the first receiving groove 111a (as shown in Figures 7 and 10). For example, in the thickness direction of the first shell wall 111, the thickness of the at least portion of the first mating structure 131 is greater than the depth H of the first receiving groove 111a, so that the entire first extension platform 122 is located outside the first receiving groove 111a.

[0123] In some embodiments, on a plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the first extension platform 122 is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove 111a, that is, on a plane perpendicular to the central axis L of the mounting through hole 111b, the space occupied by the first extension platform 122 is smaller than the accommodating space of the first accommodating groove 111a.

[0124] In the above technical solution, by being arranged on a plane perpendicular to the axial direction of the mounting through hole 111b, the orthographic projection of the first extension platform 122 is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove 111a, so that at least the portion of the first extension platform 122 facing the bottom wall of the first accommodating groove 111a is accommodated in the first accommodating groove 111a, and the first extension platform 122 is not likely to interfere with the groove wall of the first accommodating groove 111a, thereby facilitating the assembly of the first pole 12 and the first shell wall 111; moreover, the above arrangement can also improve the assembly convenience of the first extension platform 122 and the first shell wall 111 when the first extension platform 122 is completely accommodated in the first accommodating groove 111a.

[0125] In addition, in the above technical solution, there are not too many restrictions on the structure of the first extension platform 122 , and the above arrangement can be applied to first extension platforms 122 of various structural shapes, so as to achieve flexible arrangement of the first pole 12 . Exemplarily, as shown in Figures 3 and 7, the first extension platform 122 is formed as an annular flat plate structure; of course, the first extension platform 122 can also be constructed into a first plate portion and a second plate portion, and the side surface of the first plate portion facing the bottom wall of the first accommodating groove 111a protrudes from the second plate portion toward the first accommodating groove 111a so that the side surface of the first extension platform 122 facing the bottom wall of the first accommodating groove 111a has a step structure, and at least a portion of the first matching structure 131 is matched between the first shell wall 111 and the first plate portion. At this time, at least a portion of the first plate portion can be accommodated in the first accommodating groove 111a. On the plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the first plate portion is located within the orthographic projection outer contour range of the peripheral wall of the first accommodating groove 111a, the orthographic projection of the second plate portion is located within the orthographic projection outer contour range of the peripheral wall of the first accommodating groove 111a, or at least a portion of the orthographic projection of the second plate portion is located outside the orthographic projection outer contour range of the peripheral wall of the first accommodating groove 111a.

[0126] Of course, when the first extension platform 122 is configured not to be accommodated in the first accommodating groove 111a, please refer to Figures 7 and 10. On the plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the first extension platform 122 is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove 111a.

[0127] In some embodiments, the first extension platform 122 is located at an axial end of the pole body 121. In other words, the first extension platform 122 is located at the end of the pole body 121 facing the interior of the housing 11. The depth H of the first accommodating groove 111a is greater than the sum of the thickness of the at least portion of the first mating structure 131 and the first extension platform 122 in the axial direction of the mounting hole 111b, i.e., H>T1+T2, where T1 is the thickness of the at least portion of the first mating structure 131 in the axial direction of the mounting hole 111b, and T2 is the thickness of the first extension platform 122 in the axial direction of the mounting hole 111b. In this embodiment, the notch of the first accommodating groove 111a can be formed on the inner surface of the first housing wall 111 or on the outer surface of the first housing wall 111.

[0128] In the above technical solution, by arranging the first extension platform 122 at the end of the pole body 121 facing the interior of the shell 11, and the depth H of the first accommodating groove 111a is greater than the sum of the thickness of the above-mentioned at least part of the first matching structure 131 and the first extension platform 122 in the axial direction of the mounting through hole 111b, it is beneficial to further increase the accommodating space of the first accommodating groove 111a and improve the accommodating capacity of the first accommodating groove 111a. Therefore, when the shell assembly 10 is used for the battery cell 100, the first accommodating groove 111a can also provide layout space for other components of the battery cell 100 arranged on the side of the first extension platform 122 away from the pole body 121 or a part of other components arranged on the side of the first extension platform 122 away from the pole body 121, so that the above-mentioned other components or a part of the above-mentioned other components are accommodated in the first accommodating groove 111a, so as to free up more layout space for other components outside the battery cell assembly 20 or the shell 11, which is beneficial to further improve the volume energy density of the battery cell 100 or improve the volume energy density of the battery 200.

[0129] Exemplarily, the battery cell assembly 20 of the battery cell 100 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is arranged in the shell 11 and is located on the side of the first extension platform 122 away from the pole body 121. The conductive portion 22 electrically connects the active material coating portion 21 with the first pole 12; the notch of the first accommodating groove 111a can be formed on the inner surface of the first shell wall 111, and a part of the structure of the conductive portion 22 arranged on the side of the first extension platform 122 away from the pole body 121 is accommodated in the first accommodating groove 111a. At this time, part or all of the conductive portion 22 can be arranged on the side of the first extension platform 122 away from the pole body 121.

[0130] Please refer to Figures 7 to 9. In some embodiments, the first shell wall 111 includes a main body 1111 and a receiving portion 1112. The main body 1111 is arranged around the receiving portion 1112, and the main body 1111 is roughly formed into an annular structure. The receiving portion 1112 includes an end wall 1112a and a side wall 1112b. The end wall 1112a and the side wall 1112b are arranged to form a first receiving groove 111a. For example, the end wall 1112a can be configured as the bottom wall of the first receiving groove 111a, and the side wall 1112b can be configured as the surrounding wall of the first receiving groove 111a. The mounting through hole 111b is formed on the end wall 1112a; wherein, the side surface of the end wall 1112a facing away from the side wall 1112b protrudes from the surface of the main body 1111.

[0131] Exemplarily, the first shell wall 111 is the top wall of the shell body 11. If the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, the end wall 1112a is connected to the upper end of the side wall 1112b, and the upper surface of the end wall 1112a protrudes upward from the upper surface of the main body 1111; if the notch of the first accommodating groove 111a is formed on the outer surface of the first shell wall 111, the end wall 1112a is connected to the lower end of the side wall 1112b, and the lower surface of the end wall 1112a protrudes downward from the lower surface of the main body 1111.

[0132] In the above technical solution, the first shell wall 111 includes a main body 1111 and a receiving portion 1112. The main body 1111 is arranged around the receiving portion 1112, and the receiving portion 1112 defines a first receiving groove 111a, so that the first receiving groove 111a is spaced apart from the outer periphery of the first shell wall 111, so that the receiving portion 1112 can be processed by clamping and fixing the main body 1111, thereby improving processing convenience; at the same time, since the side surface of the end wall 1112a facing away from the side wall 1112b is protruding from the surface of the main body 1111, it is conducive to appropriately increasing the thickness of the end wall 1112a and improving the structural strength of the end wall 1112d, thereby improving the installation reliability of the first pole 12, and at the same time, it can also reduce the difference between the thickness of the end wall 1112a and the thickness of the main body 1111, thereby improving the balance of the structural strength of the first shell wall 111.

[0133] Of course, the embodiments of the present application are not limited to this; in some other embodiments, the first shell wall 111 includes a main body 1111 and a accommodating portion 1112, the main body 1111 is arranged around the accommodating portion 1112, the accommodating portion 1112 includes an end wall 1112a and a side wall 1112b, the end wall 1112a and the side wall 1112b are arranged to form a first accommodating groove 111a, the mounting through hole 111b is formed on the end wall 1112a, and the side surface of the end wall 1112a facing away from the side wall 1112b is flush with the surface of the main body 1111.

[0134] In the above technical solution, the main body 1111 is arranged around the accommodating portion 1112, which also facilitates processing of the accommodating portion 1112 by clamping and fixing the main body 1111, thereby improving processing convenience; and since the side surface of the end wall 1112a facing away from the side wall 1112b is flush with the surface of the main body 1111, the material amount of the first shell wall 111 is saved, thereby reducing costs, while ensuring that the first pole 12 is reliably installed.

[0135] Referring to FIG. 9 , in some embodiments, the thickness T3 of the end wall 1112 a and the thickness T4 of the side wall 1112 b are both greater than or equal to the thickness T5 of the main body 1111 , ie, T3 ≥ T5 and T4 ≥ T5.

[0136] In the above technical solution, by setting the thickness of the end wall 1112a and the thickness of the side wall 1112b to be greater than or equal to the thickness of the main body 1111, the difference between the wall thickness of the accommodating portion 1112 and the wall thickness of the main body 1111 can be further reduced. At the same time, the distribution of the material corresponding to the first shell wall 111 can be made more reasonable, which is conducive to improving the installation reliability of the first pole 12.

[0137] Exemplarily, when the thickness of the end wall 1112a is consistent with the thickness of the main body 1111, the height of the surface of the end wall 1112a facing away from the side wall 1112b protruding from the surface of the main body 1111 can be basically consistent with the depth H of the first accommodating groove 111a; when the thickness of the end wall 1112a is greater than the thickness of the main body 1111, the height of the surface of the end wall 1112a facing away from the side wall 1112b protruding from the surface of the main body 1111 can be greater than the depth H of the first accommodating groove 111a.

[0138] Referring to FIG. 9 , in some embodiments, the main body portion 1111 and the receiving portion 1112 are an integral structure formed by stamping and stretching.

[0139] In the above technical solution, by setting the main body 1111 and the accommodating portion 1112 as an integrated structure formed by stamping and stretching, the processing and forming of the first shell wall 111 is facilitated. At the same time, there is no need to set a connecting structure between the main body 1111 and the accommodating portion 1112, so as to simplify the structure of the first shell wall 111 and reduce the occupation of the first shell wall 111 on the internal space or external space of the shell 11.

[0140] For example, the thickness T3 of the end wall 1112a and the thickness T4 of the side wall 1112b are both greater than or equal to the thickness T5 of the main body 1111, and the main body 1111 and the accommodating portion 1112 are an integral structure formed by stamping and stretching. Then, the relationship between the thickness of the end wall 1112a, the thickness of the side wall 1112b and the thickness of the main body 1111 can just match the above-mentioned forming method of the first shell wall 111. There is no need to extrude part of the material of the first shell wall 111 into the accommodating portion 1112 through a special process during the forming process of the accommodating portion 1112, which reduces the difficulty of forming and does not affect the size of other parts of the first shell wall 111.

[0141] Please refer to Figure 9. In some embodiments, the minimum distance x between the outer periphery of the accommodating portion 1112 and the outer periphery of the main body portion 1111 is greater than 0.5 mm, and the minimum distance between the inner periphery and the outer periphery of the main body portion 1111 in the radial direction of the mounting through hole 111b is greater than 0.5 mm.

[0142] In the above technical solution, by setting the minimum distance between the outer periphery of the accommodating portion 1112 and the outer periphery of the main body 1111 to be greater than 0.5 mm, the main body 1111 can be pressed during the forming process of the accommodating portion 1112 to achieve sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating portion 1112, and at the same time helping to improve the regularity of the shape of the accommodating portion 1112, and preventing the main body 1111 from deformation.

[0143] For example, the minimum distance between the outer periphery of the accommodating portion 1112 and the outer periphery of the main body portion 1111 may be 0.52 mm, 0.55 mm, 0.57 mm, 0.6 mm, 0.7 mm, or 1 mm, etc.

[0144] For example, when there is one first pole 12 on the first shell wall 111, there can be one accommodating portion 1112, and the minimum distance between the outer periphery of the accommodating portion 1112 and the outer periphery of the main body 1111 is greater than 0.5 mm; when there are multiple first poles 12 on the first shell wall 111, there can be multiple accommodating portions 1112, and for each accommodating portion 1112, the minimum width of the portion of the main body 1111 connected to and surrounding the accommodating portion 1112 is greater than 0.5 mm, and the minimum width of the portion of the main body 1111 located between two adjacent accommodating portions 1112 is greater than 0.5 mm.

[0145] Therefore, when other components, such as the explosion-proof valve 16, are installed on the first shell wall 111, the minimum width of the portion of the main body 1111 located between the accommodating portion 1112 and these other components is also greater than 0.5 mm. In short, with respect to the accommodating portion 1112, the portion of the main body 1111 that is connected to and surrounds the accommodating portion 1112 leaves at least 0.5 mm of width for the accommodating portion 1112.

[0146] Please refer to Figures 4 and 9. In some embodiments, the shell 11 also includes a second shell wall 112 adjacent to the first shell wall 111. At least a portion of the outer surface of the main body 1111 is formed as a rounded surface 1111c, and the rounded surface 1111c is connected to the outer surface of the second shell wall 112.

[0147] It can be seen that in the radial direction of the mounting through hole 111b, the minimum width of the portion of the main body 1111 located between the outer circumference of the accommodating portion 1112 and the corresponding second shell wall 112 is greater than or equal to the radial width of the rounded surface 1111c.

[0148] In the above technical solution, by setting at least a portion of the outer surface of the main body 1111 to be formed as a rounded surface 1111c, it is convenient to make the minimum distance between the inner circumference and the outer circumference of the main body 1111 in the radial direction of the mounting through hole 111b greater than or equal to the radial width of the rounded surface 1111c, so that the part of the main body 1111 connected to the accommodating portion 1112 and surrounding the accommodating portion 1112 reserves the radial width of the rounded surface 1111c for the accommodating portion 1112, so that during the forming process of the accommodating portion 1112, the main body 1111 can be subjected to a pressing operation to achieve a sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating portion 1112.

[0149] Exemplarily, an accommodating portion 1112 is formed on the first shell wall 111, and the outer surface of the main body 1111 is formed as a rounded surface 1111c. The outer peripheral edge of the accommodating portion 1112 is transitionally connected to the outer surface of the second shell wall 112 through the rounded surface 1111c. During the molding process of the accommodating portion 1112, the portion corresponding to the rounded surface 1111c can be pressed. A portion of the outer surface of the main body 1111 is formed as the rounded surface 1111c, which is conducive to appropriately increasing the radial distance between the outer peripheral edge of the accommodating portion 1112 and the second shell wall 112 in the mounting through hole 111b, thereby further improving the convenience of pressing.

[0150] It is understandable that the second shell wall 112 and the first shell wall 111 can be an integrally formed part or separate structural parts.

[0151] In some embodiments, the first shell wall 111 is an integrally formed cover plate, and the first shell wall 111 is connected to the second shell wall 112 by fixing means; or, as shown in Figures 4 and 6, there are one or more second shell walls 112, and the first shell wall 111 is integrally formed with at least one second shell wall 112, and the second shell wall 112 extends toward one side in the thickness direction of the first shell wall 111.

[0152] Exemplarily, when the first shell wall 111 is rectangular, each of the four edges of the first shell wall 111 is provided with a second shell wall 112, and the four second shell walls 112 are respectively connected to the first shell wall 111 by fixing means, or at least one of the four second shell walls 112 is an integrally formed part with the first shell wall 111; when the first shell wall 111 is circular, the second shell wall 112 can be cylindrical, and in this case the second shell wall 112 can be integrally provided with the first shell wall 111 or separately provided.

[0153] For example, in conjunction with Figure 3, the shell 11 may include a shell body 11a and a cover plate 11b, the shell body 11a is an integral piece and defines a space open on one side, and the cover plate 11b is arranged on the open side of the shell body to form a accommodating cavity between the shell body 11a and the cover plate 11b. At this time, the side surface of the shell body 11a opposite to the cover plate 11b is the first shell wall 111, and the wall surface of the shell body 11a connected between the first shell wall 111 and the cover plate 11b is the second shell wall 112, or, the side surface of the shell body 11a opposite to the cover plate 11b is the second shell wall 112, and the wall surface of the shell body 11a connected between the second shell wall 112 and the cover plate 11b is the first shell wall 111, or, the cover plate 11b is the first shell wall 111, either way. For another example, the shell 11 may include a shell body, a first cover plate and a second cover plate. The shell body is an integral piece and defines a space open on two opposite sides. The first cover plate and the second cover plate are respectively arranged on the two opposite open sides of the shell body. The first shell wall 111 can be the wall surface of the shell body, the wall surface of the shell body connected to the first shell wall 111 is the second shell wall, and the first cover plate and the second cover plate are also both second shell walls 112.

[0154] Referring to Figures 7-9 , in some embodiments, the main body 1111 includes a flat portion 1111a and a rounded portion 1111b. The flat portion 1111a is connected to the second shell wall 112 via the rounded portion 1111b. The outer surface of the rounded portion 1111b is formed as a rounded surface 1111c. As can be seen, in the radial direction of the mounting hole 111b, the flat portion 1111a is located radially inward of the rounded portion 1111b and surrounds the receiving portion 1112.

[0155] In the above technical solution, by setting the main body 1111 to include a flat portion 1111a and a rounded portion 1111b, the flat portion 1111b is connected to the second shell wall 112 through the rounded portion 1111b, which is conducive to appropriately increasing the minimum width of the portion of the main body 1111 located between the outer peripheral edge of the accommodating portion 1112 and the corresponding second shell wall 112, so that during the pressing operation, the main body 1111 can provide a larger pressing width, thereby further improving the convenience of pressing.

[0156] Exemplarily, the first shell wall 111 is a rectangular plate-shaped structure, each of the four edges of the flat portion 1111a is provided with a rounded corner portion 1111b, and the flat portion 1111a is connected to the four second shell walls 112 through the four rounded corner portions 1111b.

[0157] Please refer to Figures 6 and 7. In some embodiments, the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, and in the radial direction of the mounting through hole 111b, the first matching structure 131 is spaced apart from the outer periphery of the first extension platform 122; the shell assembly 10 also includes: an insulating structure 14, which is arranged at the outer periphery of the first extension platform 122 and is at least partially matched between the first extension platform 122 and the first shell wall 111.

[0158] It can be seen that the insulating structure 14 can separate the outer periphery of the first extending platform 122 from the first shell wall 111 to achieve an insulating setting between the outer periphery of the first extending platform 122 and the first shell wall 111 .

[0159] In the above technical solution, the first matching structure 131 and the outer periphery of the first extension platform 122 are spaced apart in the radial direction of the mounting through hole 111b. Since the first matching structure 131 is not only used for insulation but also for sealing, it is beneficial to reduce the difficulty of installing the first matching structure 131 while achieving a sealed setting between the first pole 12 and the first shell wall 11. In addition, the insulating structure 14 is provided at the outer periphery of the first extension platform 122, and at least a portion of the insulating structure 14 is matched between the first extension platform 122 and the first shell wall 111, so as to improve the insulation reliability between the first extension platform 122 and the first shell wall 111, reduce the risk of short circuit caused by easy contact between the outer periphery of the first extension platform 122 and the first shell wall 111 due to large deformation of the first matching structure 131, and improve the safety of the battery cell 100.

[0160] Of course, the embodiments of the present application are not limited thereto; in some other embodiments, in the radial direction of the mounting through hole 111b, the first matching portion 131 extends to the outer periphery of the first extension platform 122, and in this case, the insulating structure 14 may not be required.

[0161] Please refer to Figure 7. In some embodiments, on a plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the first extension platform 122 is located within the outer contour of the orthographic projection of the peripheral wall of the first accommodating groove 111a. This is conducive to appropriately reducing the extension width of the first extension platform 122 and reducing costs while ensuring reliable installation of the first pole 12. At the same time, if at least a portion of the first extension platform 122 needs to be accommodated in the first accommodating groove 111a, the above arrangement facilitates the assembly of the first extension platform 122 with the first shell wall 111. Of course, the above arrangement can also be used without accommodating at least a portion of the first extension platform 122 in the first accommodating groove 111a.

[0162] 7 , the insulating structure 14 includes a first insulating portion 141 and a second insulating portion 142 connected to each other. The first insulating portion 141 is engaged between the bottom wall of the first accommodating groove 111 a and the first extension platform 122 . The second insulating portion 142 is arranged around the first extension platform 122 , and the second insulating portion 142 covers at least a portion of the outer peripheral wall of the first extension platform 122 .

[0163] In the above technical solution, an insulating structure 14 is provided including a first insulating portion 141 and a second insulating portion 142 so as to enhance the insulating protection effect of the insulating structure 14 on the first extension platform 122, reduce the risk of the first extension platform 122 contacting the peripheral wall and bottom wall of the first accommodating groove 111a, and further enhance the insulation reliability between the first extension platform 122 and the first shell wall 111.

[0164] Please refer to Figures 7 and 12. In some embodiments, the shell assembly 10 further includes a bracket 15, which is disposed in the shell 11 and is suitable for cooperating with the battery cell assembly 20 of the battery cell 100 to separate the active material coating portion 21 of the battery cell assembly 20 from the first shell wall 111.

[0165] The bracket 15 and the insulating structure 14 are an integrated part; or, the bracket 15 and the insulating structure 14 are separate parts and are connected to each other.

[0166] In the above technical solution, by arranging a bracket 15 in the shell 11, when the shell assembly 10 is used in the battery cell 100, the bracket 15 can separate the active material coating portion 21 from the first shell wall 111, so as to improve the reliability and assembly convenience of the battery cell 100, and the bracket 15 and the insulating structure 14 are flexibly arranged to better adapt to the differentiated requirements of the battery cell 100.

[0167] For example, the bracket 15 is a plastic part. For example, when the bracket 15 and the insulating structure 14 are separate parts, the bracket 15 and the insulating structure 14 can be snap-connected, plug-connected, etc.

[0168] For example, on a plane perpendicular to the central axis of the mounting through hole 111b, the orthographic projection of the active material coating portion 21 is located within the outer contour of the orthographic projection of the bracket 15. In the assembly process of the battery cell 100, the bracket 15 and the battery cell assembly 20 can be pre-installed first, and the pre-installed structure composed of the bracket 15 and the battery cell assembly 20 is loaded into the shell 11 together. When entering the shell, the bracket 15 can be located in front of the active material coating portion 21, so that the bracket 15 enters the shell before the active material coating portion 21. The bracket 15 can protect the active material coating portion 21 and reduce the chance of the active material coating portion 21 being scratched and damaged by the shell 11.

[0169] Furthermore, the battery cell 100 may include an insulating film, which is arranged inside the shell 11 and wrapped around the active material coating part 21. The insulating film is connected to the bracket 15 so that the insulating film and the bracket 15 can provide all-round protection for the active material coating part 21, improve the insulation reliability between the active material coating part 21 and the shell 11, and further reduce the risk of the active material coating part 21 being scratched by the shell 11 during the shell insertion process.

[0170] Referring to Figure 7, in some embodiments, the first pole 12 further includes a second extension platform 123, which is connected to the pole body 121 and extends relative to the pole body 121 in a direction away from the central axis L of the mounting through hole 111b. The second extension platform 123 and the first extension platform 122 extend to the inner and outer sides of the first shell wall 111 respectively; it can be seen that when the first extension platform 122 extends to the outer side of the outer surface of the first shell wall 111, the second extension platform 123 extends to the inner side of the inner surface of the first shell wall 111, and when the first extension platform 122 extends to the inner side of the inner surface of the first shell wall 111, the second extension platform 123 extends to the outer side of the outer surface of the first shell wall 111.

[0171] Exemplarily, the first shell wall 111 is the top wall of the shell body 11. If the notch of the first accommodating groove 111a is formed on the upper surface of the first shell wall 111, the first extension platform 122 extends to the upper side of the upper surface of the first shell wall 111, and the second extension platform 123 extends to the lower side of the lower surface of the first shell wall 111; and if the notch of the first accommodating groove 111a is formed on the lower surface of the first shell wall 111, the first extension platform 122 extends to the lower side of the lower surface of the first shell wall 111, and the second extension platform 123 extends to the upper side of the upper surface of the first shell wall 111.

[0172] 7 , the insulating sealing structure 13 includes a second matching structure 132, which is matched between the first shell wall 111 and the second extension platform 123. The second matching structure 132 is clamped between the first shell wall 111 and the first extension platform 122, so that the first shell wall 111 and the second extension platform 123 can be indirectly matched through the second matching structure 132 to achieve insulation and sealing between the first shell wall 111 and the second extension platform 123.

[0173] In the above technical solution, the first pole 12 is further provided with a second extension platform 123 connected to the pole body 121 and extending relative to the pole body 121 in a direction away from the central axis L of the mounting through hole 111b. The second extension platform 123 and the first extension platform 122 extend to the inner and outer sides of the first shell wall 111 respectively, so as to further improve the structural strength of the first pole 12 and facilitate the first pole 12 to be limited and matched at the mounting through hole 111b through the first extension platform 122 and the second extension platform 123, which is beneficial to improving the installation reliability of the first pole 12. At the same time, the insulation and sealing between the first shell wall 111 and the second extension platform 123 are achieved through the second matching structure 132, thereby improving the reliability of the battery cell 100.

[0174] In some embodiments, as shown in FIG7 , the first extension platform 122 extends to the inside of the inner surface of the first housing wall 111, and the second extension platform 123 extends to the outside of the outer surface of the first housing wall 111. The first pole 12 is riveted to form the second extension platform 123. Specifically, after the first pole 12 is assembled to the mounting hole 111b through the pole body 121, the second extension platform 123 is formed using a riveting process to achieve riveting and fixation of the first pole 12 to the first housing wall 111, making assembly convenient and reliable.

[0175] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the first pole 12 includes a pole body 121, a first extension platform 122 and a second extension platform 123. The first pole 12 can also be formed by welding two parts together. For example, the two parts are respectively assembled to the mounting through hole 111b, and then the two parts are welded together. One part can include a part of the pole body 121 and the first extension platform 122, and the other part can include another part of the pole body 121 and the second extension platform 123.

[0176] In some embodiments, the first shell wall 111 is also formed with a second accommodating groove (not shown in the figure), the groove of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, and the groove of the second accommodating groove is formed on the outer surface of the first shell wall 111. The second extension platform 123 extends to the outside of the outer surface of the first shell wall 111, and at least part of the second matching structure 132 is accommodated in the second accommodating groove; that is, the second matching structure 132 can be completely accommodated in the second accommodating groove, or, the second matching structure 132 can be partially accommodated in the second accommodating groove.

[0177] Taking the bottom wall of the second accommodating groove as a reference, the distance between the side surface of the above-mentioned at least part of the second matching structure 132 (i.e., the part of the second matching structure 132 accommodated in the second accommodating groove) facing the bottom wall of the second accommodating groove and the bottom wall of the second accommodating groove is less than the depth of the second accommodating groove, and the distance between the side surface of the above-mentioned at least part of the second matching structure 132 facing away from the bottom wall of the second accommodating groove and the bottom wall of the second accommodating groove is less than or equal to the depth of the second accommodating groove; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the second matching structure 132 is less than or equal to the depth of the second accommodating groove.

[0178] For example, when the first shell wall 111 is formed with a first accommodating groove 111a and a second accommodating groove, the first accommodating groove and the second accommodating groove can be arranged back to back along the wall thickness direction of the first shell wall 111, and the bottom wall of the first accommodating groove 111a is at least a part of the bottom wall of the second accommodating groove, or the bottom wall of the second accommodating groove is at least a part of the bottom wall of the first accommodating groove 111a, that is, on a plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the peripheral wall of the first accommodating groove 111a and the orthographic projection of the peripheral wall of the second accommodating groove can be radially spaced apart, or at least partially overlapped.

[0179] In the above technical solution, by accommodating at least part of the second matching structure 132 in the second accommodating groove, it is beneficial to simultaneously reduce the occupation of the first matching structure 131 and the second matching structure 132 on the layout space provided for the battery cell assembly 20 inside the shell 11, and reduce the occupation of the first matching structure 131 and the second matching structure 132 on the external space of the shell 11, thereby facilitating further improving the volume energy density of the battery cell 100.

[0180] Secondly, an embodiment of the present application provides a battery cell 100, including a cell assembly 20 and the above-mentioned shell assembly 10, the cell assembly 20 including an active material coating portion 21 and a conductive portion 22, the active material coating portion 21 is arranged in the shell 11, the active material coating portion 21 is the portion of the cell assembly 20 coated with active material, and can assist in the deintercalation of metal ions during the charging and discharging process of the battery cell 100, the conductive portion 22 electrically connects the active material coating portion 21 and the first pole 12, and the conductive portion 22 is not coated with active material.

[0181] It is understandable that both the first electrode 12 and the second electrode can be electrically connected to the active material coating portion 21 through the corresponding conductive portion 22 to achieve normal charging and discharging of the battery cell 100.

[0182] It should be noted that in the embodiment of the present application, the active material coating portion 21 can be divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with the positive electrode active material layer 212, and the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with the negative electrode active material layer 212. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion electrically connects the positive electrode active material coating portion and the positive electrode post, and the negative electrode conductive portion electrically connects the negative electrode active material coating portion and the negative electrode post.

[0183] Obviously, the position of the first receiving groove 111a can be located on the side of the first shell wall 111 away from the active material coating portion 21, that is, the groove of the first receiving groove 111a is formed on the side surface of the first shell wall 111 away from the active material coating portion 21 (that is, the outer surface of the first shell wall 111); or, the position of the first receiving groove 111a is located on the side of the first shell wall 111 facing the active material coating portion 21, that is, the groove of the first receiving groove 111a is formed on the side surface of the first shell wall 111 facing the active material coating portion 21 (that is, the inner surface of the first shell wall 111).

[0184] In the above technical solution, since the battery cell 100 adopts the above-mentioned shell assembly 10 , the volume energy density of the battery cell 100 can be improved.

[0185] It is understandable that in the embodiment of the present application, the shape of the shell 11 is adjusted according to the type of battery cell 100; for example, when the battery cell 100 is a square battery, the shell 11 is square; when the battery cell 100 is a cylindrical battery, the shell 11 is cylindrical.

[0186] Please refer to Figures 11 and 12. In the first embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211. The conductive portion 22 includes a pole ear portion 221 electrically connected to the current collector 211. The pole ear portion 221 includes a plurality of pole ear sheets. The plurality of pole ear sheets converge at a position close to the current collector 211 (i.e., gather in a direction close to each other) to form a first gathered portion 2211. The plurality of pole ear sheets converge at a position away from the current collector 211 and are connected to form a second gathered portion 2212. The first gathered portion 2211 connects the second gathered portion 2212 and the active material coating portion 21.

[0187] It can be seen that the multiple tabs are only brought together but not connected when forming the first gathered portion, while the multiple tabs are not only brought together but also connected into an integrated structure when forming the second gathered portion 2212. For example, the multiple tabs are connected into an integrated plate structure by welding, conductive adhesive bonding, etc. to form the second gathered portion 2212.

[0188] The phrase "a plurality of electrode tabs converge near the current collector 211 to form a first gathered portion 2211, and a plurality of electrode tabs converge and connect to form a second gathered portion 2212 at positions away from the current collector 211" can be understood as meaning that, along the extension direction of the electrode tabs, the first gathered portion 2211 and the second gathered portion 2212 are sequentially arranged in a direction away from the current collector 211. The electrode tabs and the current collector 211 may be integral or separate components.

[0189] It should be noted that in the embodiments of the present application, the electrode tabs are respectively positive electrode tabs and negative electrode tabs. The positive electrode tabs that need to be folded together are stacked and pre-welded to form a second folded portion of the positive electrode to reduce the interlayer gap, so that the fluffy multiple positive electrode tabs form a plate structure with a certain rigidity; similarly, the negative electrode tabs are also processed as described above.

[0190] 14 , the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, and at least a portion of the second retracted portion 2212 is accommodated in the first accommodating groove 111a, that is, part or all of the second retracted portion 2212 can be accommodated in the first accommodating groove 111a.

[0191] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the end of the above-mentioned at least part of the second gathering portion 2212 (i.e., the part of the second gathering portion 2212 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the end of the above-mentioned at least part of the second gathering portion 2212 away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than or equal to the depth of the first accommodating groove 111a; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the second gathering portion 2212 is less than or equal to the depth of the first accommodating groove 111a.

[0192] In the above technical solution, a second gathered portion 2212 is formed by arranging multiple pole tabs close to the current collector 211, and at least a portion of the second gathered portion 2212 is accommodated in the first accommodating groove 111a, so as to reduce the occupation of the pole tab portion 221 by the layout space provided for the battery cell assembly 20 inside the shell 11, which is beneficial to further improve the volume energy density of the battery cell 100.

[0193] It can be understood that in the first embodiment, when at least part of the second gathering portion 2212 is accommodated in the first accommodating groove 111a, the embodiments of the present application may include the following schemes: 1. At least part of the first matching structure 131 is accommodated in the first accommodating groove 111a, and the first extension platform 122 is not accommodated in the first accommodating groove 111a; 2. At least part of the first matching structure 131 and at least part of the first extension platform 122 are both accommodated in the first accommodating groove 111a.

[0194] Of course, in other embodiments, in the first embodiment, the second gathering portion 2212 can also be provided outside the first accommodating groove 111a. At this time, the embodiments of the present application may include the following schemes: 1. At least part of the first matching structure 131 is accommodated in the first accommodating groove 111a, and the first extension platform 122 is not accommodated in the first accommodating groove 111a; 2. At least part of the first matching structure 131 and at least part of the first extension platform 122 are both accommodated in the first accommodating groove 111a.

[0195] In other words, the setting position of the second gathering portion 2212 has no direct connection with the setting position of the first extension platform 122. In the axial direction of the mounting through hole 111b, the second gathering portion 2212 can be set on the side of the first extension platform 122 away from the active material coating portion 21, or the second gathering portion 2212 can be set on the side of the first extension platform 122 facing the active material coating portion 21, or the second gathering portion 2212 is basically aligned with the first extension platform 122.

[0196] Please refer to Figure 15. In some embodiments, the conductive part 22 also includes an adapter plate 222, which is connected to the second retracted portion 2212. The conductive part 22 is electrically connected to the first pole 12 through the adapter plate 222. At least a portion of the adapter plate 222 is accommodated in the first accommodating groove 111a, and then all or part of the adapter plate 222 can be accommodated in the first accommodating groove 111a.

[0197] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the end of the above-mentioned at least part of the adapter plate 222 (i.e., the part of the adapter plate 222 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the end of the above-mentioned at least part of the adapter plate 222 facing away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than or equal to the depth of the first accommodating groove 111a; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the adapter plate 222 is less than or equal to the depth of the first accommodating groove 111a.

[0198] In the above technical solution, the second retracted portion 2212 is provided to be indirectly electrically connected to the first pole 12 through the adapter plate 222, and at least a portion of the adapter plate 222 is accommodated in the first accommodating groove 111a, so as to reduce the occupation of the conductive portion 22 by the layout space provided for the battery cell assembly 20 inside the shell 11, which is conducive to further improving the volume energy density of the battery cell 100.

[0199] It can be seen that in the first embodiment, the second retracted portion 2212 can be directly electrically connected to the first pole 12 , or the second retracted portion 2212 can be indirectly electrically connected to the first pole 12 via the adapter piece 222 .

[0200] It can be understood that when at least a portion of the adapter plate 222 is accommodated in the first accommodating groove 111a, the embodiments of the present application may include the following solutions: 1. At least a portion of the first matching structure 131 is accommodated in the first accommodating groove 111a, and the first extension platform 122 is not accommodated in the first accommodating groove 111a; 2. At least a portion of the first matching structure 131 and at least a portion of the first extension platform 122 are both accommodated in the first accommodating groove 111a.

[0201] Of course, in other embodiments, the adapter plate 222 can also be arranged outside the first accommodating groove 111a. In this case, the embodiments of the present application may include the following schemes: 1. At least part of the first matching structure 131 is accommodated in the first accommodating groove 111a, and the first extension platform 122 is not accommodated in the first accommodating groove 111a; 2. At least part of the first matching structure 131 and at least part of the first extension platform 122 are both accommodated in the first accommodating groove 111a.

[0202] In other words, the setting position of the adapter plate 222 has no direct connection with the setting position of the first extension platform 122. In the axial direction of the mounting through hole 111b, the adapter plate 222 can be set on the side of the first extension platform 122 away from the active material coating portion 21, or the adapter plate 222 can be set on the side of the first extension platform 122 facing the active material coating portion 21, or the adapter plate 222 is basically aligned with the first extension platform 122.

[0203] Referring to FIG. 16 , in some embodiments, a portion of the first folded portion 2211 is received in the first receiving groove 111 a , while another portion of the first folded portion 2211 is located outside the first receiving groove 111 a .

[0204] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the end of the above-mentioned part of the first gathering portion 2211 (i.e., the part of the first gathering portion 2211 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the end of the above-mentioned part of the first gathering portion 2211 facing away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is equal to the depth of the first accommodating groove 111a.

[0205] In the above technical solution, by accommodating a portion of the first retracted portion 2211 in the first accommodating groove 111a, the pole ear portion 221 can further reduce the space occupied by the arrangement space provided for the battery cell assembly 20 inside the shell 11, which is beneficial to further improve the volume energy density of the battery cell 100.

[0206] In other embodiments of the present application, the first retracted portion 2211 may also be disposed outside the first receiving groove 111 a.

[0207] In some embodiments, in the first embodiment, at least a portion of the adapter plate 222 and a portion of the first retracted portion 2211 are both accommodated in the first accommodating groove 111 a .

[0208] Referring to FIG15 , in a second embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 and a transition piece 222. The tab portion 221 includes a plurality of tabs electrically connected to the current collector 211. The plurality of tabs converge near the current collector 211 to form a first gathered portion 2211. The plurality of tabs converge and connect to form a second gathered portion 2212 away from the current collector 211. The transition piece 222 is electrically connected to the second gathered portion 2212.

[0209] 15 , the notch of the first receiving groove 111 a is formed on the inner surface of the first shell wall 111 , at least a portion of the adapter plate 222 is received in the first receiving groove 111 a , and the adapter plate 222 is electrically connected to the first pole 12 .

[0210] Taking the bottom wall of the first accommodating groove 111a as a reference, the distance between the end of the above-mentioned at least part of the adapter plate 222 (i.e., the part of the adapter plate 222 accommodated in the first accommodating groove 111a) facing the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than the depth H of the first accommodating groove 111a, and the distance between the end of the above-mentioned at least part of the adapter plate 222 facing away from the bottom wall of the first accommodating groove 111a and the bottom wall of the first accommodating groove 111a is less than or equal to the depth of the first accommodating groove 111a; then, in the wall thickness direction of the first shell wall 111, the thickness of the above-mentioned at least part of the adapter plate 222 is less than or equal to the depth of the first accommodating groove 111a.

[0211] In the above technical solution, by accommodating at least part of the adapter plate 222 in the first accommodating groove 111a, the conductive part 22 reduces the space occupied by the inner shell 11 for the battery cell assembly 20, which is beneficial to further improve the volume energy density of the battery cell 100.

[0212] It is worth noting that in the second embodiment, the location of the adapter plate 222 is not directly related to the location of the first extension platform 122. Therefore, when at least a portion of the adapter plate 222 is accommodated in the first receiving groove 111a, the first extension platform 122 can be located outside the first receiving groove 111a, or at least a portion of the first extension platform 122 can be accommodated within the first receiving groove 111a. Of course, in the second embodiment, the adapter plate 222 can also be located outside the first receiving groove 111a, in which case the first extension platform 122 can be located outside the first receiving groove 111a, or at least a portion of the first extension platform 122 can be accommodated within the first receiving groove 111a.

[0213] It is understood that in the second embodiment, at least a portion of the second gathering portion 2212 can be accommodated within the first receiving groove 111a, or the second gathering portion 2212 can be disposed outside the first receiving groove 111a. Similarly, in the second embodiment, a portion of the first gathering portion 2211 can be accommodated within the first receiving groove 111a, or the first gathering portion 2211 can be disposed outside the first receiving groove 111a. For example, in the second embodiment: 1. At least a portion of the second gathering portion 2212 is accommodated within the first receiving groove 111a, and the first gathering portion 2211 is disposed outside the first receiving groove 111a; 2. At least a portion of the second gathering portion 2212 and a portion of the first gathering portion 2211 are both accommodated within the first receiving groove 111a; 3. Both the first gathering portion 2211 and the second gathering portion 2212 are disposed outside the first receiving groove 111a.

[0214] Please refer to Figures 12 to 16. In some embodiments, the first pole 12 is formed with a third receiving groove 12a. The notch of the third receiving groove 12a is formed on the side surface of the first pole 12 away from the active material coating portion 21. The third receiving groove 12a is connected to the interior of the shell 11 through the through hole 12b. The conductive portion 22 is passed through the through hole 12b and at least a portion of the conductive portion 22 is received in the third receiving groove 12a.

[0215] In the above technical solution, by providing the third accommodating groove 12a, it is beneficial to reduce the weight of the first pole 12, so as to improve the weight energy density of the battery cell 100. At the same time, since the notch of the third accommodating groove 12a is formed on the outer end face of the pole, when at least part of the conductive part 22 is accommodated in the third accommodating groove 12a, it is convenient to realize the storage and arrangement of the conductive part 22 through the notch of the third accommodating groove 12a, or the electrical connection of the conductive part 22 with the first pole 12, etc., thereby reducing the production difficulty of the battery cell 100. At the same time, since the third receiving groove 12a can be connected to the interior of the shell 11 through the perforation 12b, the third receiving groove 12a can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 100 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 100 can be extended; and because the third receiving groove 12a can be connected to the interior of the shell 11 through the perforation 12b, the third receiving groove 12a can also serve as a storage and buffer structure for gas generated inside the battery cell assembly 20, thereby reducing the expansion of the battery cell 100.

[0216] It can be understood that the above technical solution is applicable to both the first embodiment and the second embodiment mentioned above.

[0217] For example, the first pole 12 may further include a pole cover 124 . The pole cover 124 is disposed on the notch of the third receiving groove 12 a to close the third receiving groove 12 a .

[0218] Of course, the connection arrangement between the conductive portion 22 and the first electrode 12 is not limited to this. For example, the conductive portion 22 can also be directly electrically connected to the end of the first electrode 12 facing the active material coating portion 21. In this case, the conductive portion 22 does not need to be provided through the through-hole 12b. Alternatively, as shown in FIG10 , a fourth receiving groove 12c is formed on the side of the first electrode 12 facing the active material coating portion 21. The notch of the fourth receiving groove 12c is formed on the surface of the side of the first electrode 12 facing the active material coating portion 21. At least a portion of the second converging portion 2212 is received in the fourth receiving groove 12c. The conductive portion 22 is electrically connected to the bottom wall of the fourth receiving groove 12c on the side away from the active material coating portion 21.

[0219] For example, if the depth H of the first receiving groove 111a is less than (the thickness of the first mating structure 131 in the axial direction of the mounting hole 111b + the thickness of the first extension platform 122 in the axial direction of the mounting hole 111b + Δ), the first receiving groove 111a can accommodate at least a portion of the first mating structure 131. For example, the first receiving groove 111a accommodates at least a portion of the first mating structure 131 and does not accommodate the first extension platform 122, or the first receiving groove 111a accommodates the first mating structure 131 and at least a portion of the first extension platform 122 and does not accommodate the conductive portion 22, or the first receiving groove 111a accommodates the first mating structure 131, at least a portion of the first extension platform 122, and at least a portion of the conductive portion 22. It can be seen that the value of Δ can be related to the maximum required height of the conductive portion 22. For example, Δ can be 5.5 mm, but is not limited thereto.

[0220] In a third aspect, an embodiment of the present application provides a battery 200 including the above-mentioned battery cell 100 .

[0221] In the above technical solution, since the battery 200 adopts the above-mentioned battery cell 100 , the energy density and reliability of the battery 200 can be improved.

[0222] Please refer to Figures 16 and 17. In some embodiments, there are multiple battery cells 100, and the first pole 12 is arranged to protrude from the outer surface of the first shell wall 111; the battery 200 also includes a confluence component 102, and the reflux component 102 includes a buffer portion 1021 and two connecting portions 1022. The two connecting portions 1022 are electrically connected to the first poles 12 of the two battery cells 100 respectively, and the buffer portion 1021 is connected between the two connecting portions 1022, and at least a portion of the buffer portion 1021 protrudes toward the shell 11 relative to the connecting portion 102 and can be stretched and deformed. Therefore, at least a portion of the buffer portion 1021 has a certain stretching and deformation ability under the action of external force.

[0223] In the above technical solution, by setting at least a portion of the buffer portion 1021 to be stretchable and deformable, the busbar component 102 can relieve the stress caused by the expansion of the battery cell 100 during the use of the battery 200. At least a portion of the buffer portion 1021 can undergo a certain degree of stretching deformation following the expansion of the battery cell 100, so as to reduce the pulling of the busbar component 102 on the first pole 12, and also reduce the tensile force borne by the busbar component 102, thereby reducing the risk of the busbar component 102 being pulled and broken, thereby improving the reliability of the battery 200; and by setting at least a portion of the buffer portion 1021 to protrude toward the shell 11 relative to the connecting portion 102, so that the first pole 12 of each of the two battery cells 100 protrudes from the space corresponding to the corresponding portion of the shell 11 is used to jointly accommodate at least a portion of the buffer portion 1021, which is beneficial to reducing the occupied space of the battery 200 and facilitating further improving the volume energy density of the battery 200.

[0224] For example, at least a portion of the buffer portion 1021 is formed as a bent portion having an opening, and the opening is disposed away from the housing 11 .

[0225] In a fourth aspect, an embodiment of the present application provides an electrical device 1000 , comprising the above-mentioned battery 200 , and the battery 200 is used to provide electrical energy.

[0226] In the above technical solution, since the power-consuming device 1000 adopts the above-mentioned battery 200 , the battery life and reliability of the power-consuming device 1000 can be improved.

[0227] Please refer to FIG. 7 , FIG. 10 and FIG. 11 again to describe the battery cell 100 according to a specific embodiment of the present application.

[0228] In the embodiment of the present application, a battery cell 100 includes a housing assembly 10 and a cell assembly 20. The housing assembly 10 includes a housing 11, a first electrode 12, an insulating sealing structure 13, an insulating structure 14, and a bracket 15. The cell assembly 20 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is disposed within the housing 11, and the conductive portion 22 electrically connects the active material coating portion 21 to the first electrode 12.

[0229] The housing 11 includes a housing body 11a and a housing cover 11b. One side of the housing body 11a is open. The housing wall on the side opposite to the open side of the housing body 11a is a first housing wall 111. The four side walls connected between the first housing wall 111 and the housing cover 11b are all second housing walls 112. The first housing wall 111 includes a main body 1111 and a receiving portion 1112. The main body 1111 is arranged around the receiving portion 1112. The receiving portion 1112 includes an end wall 1112a and a side wall 1112b. The end wall 1112a and the side wall 1112b are arranged to form a first receiving groove 111a. The notch of the first receiving groove 111a is formed on the inner surface of the first housing wall 111. The mounting through hole 111b is formed on the end wall 1111. 112a, the outer surface of the end wall 1112a protrudes from the outer surface of the main body 1111; the first pole 12 protrudes from the outer surface of the first shell wall 111, and the first pole 12 includes a pole body 121, a first extension platform 122 and a second extension platform 123. The pole body 121 is inserted into the mounting hole 111b, and the first extension platform 122 and the second extension platform 123 are respectively provided at the axial ends of the pole body 121 and both extend relative to the pole body 121 in a direction away from the central axis L of the mounting hole 111b. The first extension platform 122 extends to the inner side of the inner surface of the first shell wall 111, and the second extension platform 123 extends to the outer side of the outer surface of the first shell wall 111.

[0230] The insulating sealing structure 13 includes a first mating structure 131 and a second mating structure 132. The first mating structure 131 is positioned between the first shell wall 111 and the first extension platform 122, while the second mating structure 132 is positioned between the first shell wall 111 and the second extension platform 123. On a plane perpendicular to the central axis L of the mounting hole 111b, the orthographic projections of the first extension platform 122 and the second extension platform 123 are both located within the area enclosed by the orthographic projection of the side wall 1112b. In the radial direction of the mounting hole 111b, the first mating structure 131 is spaced from the outer periphery of the first extension platform 122. The insulating structure 14 is positioned at the outer periphery of the first extension platform 122 and at least partially positioned between the first extension platform 122 and the end wall 1112a. The bracket 15 is disposed within the shell 11 and engages with the cell assembly 20 to separate the active material coating portion 21 from the first shell wall 111. The first matching structure 131 is disposed in the first receiving groove 111 a , and the first extending platform 122 and the conductive portion 22 are both disposed outside the first receiving groove 111 a .

[0231] The housing assembly 10 may include a first insulating seal, at least a portion of which is configured as a first mating structure 131. Exemplarily, the first insulating seal includes the first mating structure 131 and a third mating structure, the third mating structure being connected radially inwardly of the first mating structure 131 and mating between the wall of the mounting hole 111b and the pole body 121. The housing assembly 10 may include a second insulating seal, at least a portion of which is configured as a second mating structure 132. Exemplarily, the second insulating seal includes the second mating structure 132 and a fourth mating structure, the fourth mating structure being connected radially inwardly of the second mating structure 132 and mating with the outer circumferential wall of the second extension platform 123.

[0232] In the above technical solution, a first accommodating groove 111a is provided so that, on the premise that the shell 11 provides sufficient layout space for the battery cell assembly 20, the shell 11 also provides layout space for at least part of the first matching structure 131. The part of the first matching structure 131 located in the first accommodating groove 111a will not occupy the layout space provided by the shell 11 for the battery cell assembly 20, thereby improving the volume energy density of the battery cell 100.

[0233] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of this application may be combined with each other. The above are only preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A housing assembly, wherein: include: A housing, the housing comprising a first housing wall, the first housing wall being formed with a first receiving groove, the notch of the first receiving groove being formed on the outer surface or the inner surface of the first housing wall, and the bottom wall of the first receiving groove being formed with a mounting through hole; A first pole, the first pole comprising a pole body passing through the mounting through hole, and a first extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole, the first extension platform being arranged on a side of the first shell wall where the first accommodating groove is formed; The insulating sealing structure includes a first matching structure, the first matching structure is matched between the first shell wall and the first extension platform, and at least a part of the first matching structure is accommodated in the first accommodating groove.

2. The housing assembly according to claim 1, wherein: At least a portion of the first extension platform is accommodated in the first accommodation groove.

3. The housing assembly according to claim 2, wherein: On a plane perpendicular to the central axis of the mounting through hole, the orthographic projection of the first extension platform is located within the orthographic projection outer contour of the peripheral wall of the first accommodating groove.

4. The housing assembly according to claim 3, wherein: The first extension platform is located at an axial end of the pole body, and a depth of the first accommodating groove is greater than a sum of a thickness of at least a portion of the first matching structure and the first extension platform in an axial direction of the mounting through hole.

5. The housing assembly according to any one of claims 1 to 4, wherein: The first shell wall includes a main body and a receiving portion, the main body is arranged around the receiving portion, the receiving portion includes an end wall and a side wall, the end wall and the side wall are arranged to form the first receiving groove, the mounting through hole is formed on the end wall, and a side surface of the end wall facing away from the side wall protrudes from the surface of the main body.

6. The housing assembly according to claim 5, wherein: The thickness of the end wall and the thickness of the side wall are both greater than or equal to the thickness of the main body.

7. The housing assembly according to claim 5 or 6, wherein: The main body and the accommodating portion are an integral structure formed by stamping or stretching.

8. The housing assembly according to claim 7, wherein: The minimum distance between the outer periphery of the accommodation portion and the outer periphery of the main body portion is greater than 0.5 mm.

9. The housing assembly according to claim 7 or 8, wherein: The housing further includes a second housing wall adjacent to the first housing wall, and at least a portion of an outer surface of the main body portion is formed as a rounded surface, and the rounded surface is connected to an outer surface of the second housing wall.

10. The housing assembly according to claim 9, wherein: The main body portion includes a flat portion and a rounded portion, the flat portion is connected to the second shell wall via the rounded portion, and an outer surface of the rounded portion is formed as the rounded surface.

11. The housing assembly according to any one of claims 1 to 4, wherein: The first shell wall includes a main body and a receiving portion, the main body is arranged around the receiving portion, the receiving portion includes an end wall and a side wall, the end wall and the side wall are arranged to form the first receiving groove, the mounting through hole is formed on the end wall, and a side surface of the end wall facing away from the side wall is flush with a surface of the main body.

12. The housing assembly according to any one of claims 1 to 11, wherein: The notch of the first accommodating groove is formed on the inner surface of the first shell wall, and in the radial direction of the mounting through hole, the first matching structure is spaced apart from the outer periphery of the first extension platform. The housing assembly further comprises: An insulating structure is disposed at an outer periphery of the first extension platform and is at least partially fitted between the first extension platform and the first shell wall.

13. The housing assembly according to claim 12, wherein: On a plane perpendicular to the central axis of the mounting through hole, the orthographic projection of the first extension platform is located within the orthographic projection outer contour of the peripheral wall of the first receiving groove. The insulating structure includes a first insulating portion and a second insulating portion connected to each other, wherein the first insulating portion is fitted between the bottom wall of the first accommodating groove and the first extending platform, and the second insulating portion is arranged around the first extending platform and covers at least a portion of the outer peripheral wall of the first extending platform.

14. The housing assembly according to claim 12 or 13, wherein: The housing assembly further comprises: a bracket, the bracket being arranged in the shell and being adapted to cooperate with the battery cell assembly of the battery monomer to separate the active material coating portion of the battery cell assembly from the first shell wall, The bracket and the insulating structure are an integrated part; or the bracket and the insulating structure are separate parts and are connected.

15. The housing assembly according to any one of claims 1 to 14, wherein: The first pole further includes a second extension platform connected to the pole body and extending relative to the pole body in a direction away from the central axis of the mounting through hole, wherein the second extension platform and the first extension platform extend to the inner and outer sides of the first shell wall respectively. The insulating sealing structure includes a second matching structure, and the second matching structure is matched between the first shell wall and the second extension platform.

16. The housing assembly according to claim 15, wherein: The first shell wall also forms a second accommodating groove, the notch of the first accommodating groove is formed on the inner surface of the first shell wall, the notch of the second accommodating groove is formed on the outer surface of the first shell wall, the second extension platform extends to the outside of the outer surface of the first shell wall, and at least part of the second matching structure is accommodated in the second accommodating groove.

17. A battery cell, wherein: include: A housing assembly, wherein the housing assembly is a housing assembly according to any one of claims 1 to 16; A battery cell assembly includes an active material coating portion and a conductive portion, wherein the active material coating portion is disposed in the shell, and the conductive portion electrically connects the active material coating portion with the first pole.

18. The battery cell according to claim 17, wherein: The active material coating portion includes a current collector and an active material layer disposed on the current collector, the conductive portion includes a pole ear portion electrically connected to the current collector, the pole ear portion includes a plurality of pole ear sheets, a plurality of the pole ear sheets converge at positions close to the current collector to form a first gathered portion, a plurality of the pole ear sheets converge at positions away from the current collector and are connected to form a second gathered portion, the first gathered portion connects the second gathered portion and the active material coating portion, The notch of the first accommodating groove is formed on the inner surface of the first shell wall, and at least a part of the second gathering portion is accommodated in the first accommodating groove.

19. The battery cell according to claim 18, wherein: The conductive portion further includes an adapter plate, the adapter plate is connected to the second retracted portion, the conductive portion is electrically connected to the first pole via the adapter plate, and at least a portion of the adapter plate is accommodated in the first accommodation groove.

20. The battery cell according to claim 18 or 19, wherein: A portion of the first folded portion is accommodated in the first accommodating groove.

21. The battery cell according to claim 17, wherein: The active material coating portion includes a current collector and an active material layer disposed on the current collector, the conductive portion includes a pole ear portion and a transfer sheet, the pole ear portion includes a plurality of pole ear sheets electrically connected to the current collector, a plurality of the pole ear sheets converge at positions close to the current collector to form a first gathered portion, a plurality of the pole ear sheets converge at positions away from the current collector and are connected to form a second gathered portion, and the transfer sheet is electrically connected to the second gathered portion, The notch of the first accommodating groove is formed on the inner surface of the first shell wall, and at least a portion of the adapter is accommodated in the first accommodating groove and is electrically connected to the first pole.

22. The battery cell according to any one of claims 17 to 21, wherein: The first pole is formed with a third receiving groove, the notch of the third receiving groove is formed on the side surface of the first pole away from the active material coating part, the third receiving groove is connected with the interior of the shell through a through hole, the conductive part is passed through the through hole and is at least partially received in the third receiving groove.

23. A battery, wherein: Comprising a battery cell according to any one of claims 17-22.

24. The battery according to claim 23, wherein There are multiple battery cells, and the first pole is protruding from the outer surface of the first shell wall. The battery also includes a busbar component, which includes a buffer portion and two connecting portions. The two connecting portions are electrically connected to the first poles of two battery cells respectively, and the buffer portion is connected between the two connecting portions, and at least a portion of the buffer portion protrudes toward the shell relative to the connecting portion and can be stretched and deformed.

25. An electrical device, wherein: Comprising a battery according to claim 23 or 24.

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