Shell assembly, battery cell, battery and electric device

Abstract

The invention discloses a shell assembly, a battery monomer, a battery and a power utilization device, the shell assembly comprises a shell, a pole and an insulation sealing structure, the shell comprises a first shell wall, a first accommodating groove is formed in the first shell wall, a groove opening of the first accommodating groove is formed in the outer surface or the inner surface of the first shell wall, a mounting through hole is formed in the bottom wall of the first accommodating groove, and the mounting through hole is formed in the bottom wall of the first accommodating groove; the first pole comprises a pole body penetrating through the mounting through hole and a first extension table extending in the direction away from the central axis of the mounting through hole relative to the pole body, the first extension table is arranged on the side, where the first containing groove is formed, of the first shell wall, and the insulation sealing structure comprises a first matching structure; the first matching structure is matched between the first shell wall and the first extending table, and at least part of the first matching structure is contained in the first containing groove. According to the shell assembly provided by the embodiment of the invention, the energy density of the battery monomers can be improved.

Description

Technical Field

[0001] 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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. Usually, batteries include multiple battery cells to provide suitable voltage and capacity for electric vehicles; however, it is difficult to improve the energy density of battery cells, which makes it difficult to improve the range of electric vehicles, and easily limits the use scenarios of battery cells and electric vehicles. Summary of the invention

[0003] The present application proposes a shell assembly, a battery cell, a battery and an electrical device, which are beneficial to improving the energy density of the battery cell.

[0004] 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 being formed with a first accommodating groove, the notch of the first accommodating groove being formed on the outer surface or the 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.

[0005] 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, thereby improving the volume energy density of the battery cell.

[0006] In some embodiments, at least a portion of the first extension platform is received in the first receiving groove.

[0007] 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 can provide 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.

[0008] 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.

[0009] 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 portion 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.

[0010] 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 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.

[0011] In the above technical scheme, 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 being greater than the sum of the thickness of at least the above-mentioned part of the first matching structure and 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 free up 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.

[0012] 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.

[0013] 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 surface of the side of the end wall facing away from the side wall protrudes from the surface of the main body, it is beneficial to appropriately increase the thickness of the end wall and improve 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.

[0014] 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.

[0015] 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 beneficial to improving the installation reliability of the first pole.

[0016] In some embodiments, the main body portion and the receiving portion are an integral structure formed by stamping or stretching.

[0017] In the above technical solution, by setting the main body and the containing 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 containing 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.

[0018] 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.

[0019] 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 subjected to a pressing operation during the forming process of the accommodating part so as to achieve a sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating part. At the same time, it is beneficial to improve the regularity of the shape of the accommodating part and prevent the main body from being deformed.

[0020] In some embodiments, the shell further includes a second shell wall adjacent to the first shell wall, and at least a portion of an outer surface of the main body portion is formed as a rounded surface, which is connected to an outer surface of the second shell wall.

[0021] 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, the minimum distance between the inner circumference and the outer circumference of the main body in the radial direction of the mounting through hole is greater than or equal to the radial width of the rounded surface, so that the portion of the main body connected to the accommodating portion and surrounding the accommodating portion reserves a 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 a sufficient pressing width, thereby improving the operational feasibility of stretching or stamping the accommodating portion.

[0022] 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.

[0023] In the above technical solution, by setting the main body to include a flat portion and a rounded portion, the flat portion is connected to the second shell wall through the rounded portion, which is conducive to appropriately increasing the minimum width of the portion of the main body located between the outer peripheral edge of the accommodating portion and the corresponding second shell wall, so that during the edge pressing operation, the main body can provide a larger edge pressing width, so as to further improve the convenience of edge pressing.

[0024] 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 flush with the surface of the main body.

[0025] In the above technical solution, the main body is arranged around the accommodating portion, which is also convenient for processing the accommodating portion by clamping and fixing the main body, thereby improving the processing convenience; and because the surface of the side of the end wall facing away from the side wall is arranged flush with the surface of the main body, the material of the first shell wall can be saved and the cost can be reduced under the premise that the first pole is reliably installed.

[0026] 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.

[0027] 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 installation 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 on the premise of achieving a sealed setting between the first pole and the first shell wall. In addition, an insulating structure is arranged 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 the outer peripheral edge of the first extension platform and the first shell wall being easily contacted due to the large deformation of the first matching structure, and improve the safety of the battery cell.

[0028] 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 that are connected, the first insulating portion is fitted between the bottom wall of the first accommodating groove and the first extension platform, and the second insulating portion is arranged around the first extension platform and covers at least a portion of the outer peripheral wall of the first extension platform.

[0029] In the above technical solution, an insulating structure including a first insulating part and a second insulating part is provided so as 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 receiving groove, and further enhance the insulation reliability between the first extension platform and the first shell wall.

[0030] In some embodiments, the shell assembly also includes: a bracket, which is disposed in 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.

[0031] In the above technical solution, by arranging a bracket inside the shell, when the shell assembly is used in a battery cell, the bracket can separate the active material coating portion from the first shell wall, so as to improve the reliability and assembly convenience of the battery cell, and the bracket and the insulation structure are flexibly arranged to better adapt to the differentiated needs of the battery cell.

[0032] 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.

[0033] 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 limitedly 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 realized through the second matching structure, thereby improving the reliability of the battery cell.

[0034] In some embodiments, the first shell wall is also formed with a second accommodating groove, the groove of the first accommodating groove is formed on the inner surface of the first shell wall, the groove 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 a portion of the second mating structure is accommodated in the second accommodating groove.

[0035] 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 for 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 for the space outside the shell, thereby facilitating further improving the volume energy density of the battery cell.

[0036] In a second aspect, an embodiment of the present application provides a battery cell, including the above-mentioned shell assembly and battery cell assembly, the battery cell assembly includes an active material coating portion and a conductive portion, the active material coating portion is arranged in the shell, and the conductive portion electrically connects the active material coating portion with the first pole.

[0037] In the above technical solution, the battery cell adopts the above shell assembly, which can improve the volume energy density and use reliability of the battery cell.

[0038] In some embodiments, 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, 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 at a position 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 portion of the second gathered portion is accommodated in the first accommodating groove.

[0039] In the above technical solution, a second gathered portion is formed by arranging a plurality of pole ear sheets close to the current collector, and at least a portion of the second gathered portion is accommodated in the first accommodating groove, so as to reduce the occupation of the pole ear portion by 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.

[0040] In some embodiments, 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.

[0041] In the above technical solution, the second folding portion is indirectly electrically connected to the first pole through the adapter plate, and at least a portion of the adapter plate is accommodated in the first accommodating groove to reduce the occupation of the conductive portion by 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.

[0042] In some embodiments, a portion of the first gathered portion is received in the first receiving groove.

[0043] 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.

[0044] In some embodiments, 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 transition piece, the pole ear portion includes a plurality of pole ear sheets electrically connected to the current collector, 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 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.

[0045] In the above technical solution, at least part of the adapter is accommodated in the first accommodation groove to reduce the occupation of the conductive part in the arrangement space provided for the battery cell assembly inside the shell, which is beneficial to further improve the volume energy density of the battery cell.

[0046] 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.

[0047] In the above technical solution, by setting the third receiving groove, it is helpful to reduce the weight of the first pole, so as to improve the weight energy density of the battery cell. At the same time, since the notch of the third receiving groove is formed on the outer end face of the pole, when at least part of the conductive part is accommodated in the third receiving groove, it is convenient to realize the storage and arrangement of the conductive part through the notch of the third receiving groove, or the operation of electrically connecting the conductive part with the first pole, etc., thereby reducing the difficulty of producing the battery cell. At the same time, since the third receiving groove can be connected to the inside of the shell through the perforation, the third receiving groove can also be used as a buffer and temporary storage structure of the electrolyte, so that more electrolyte can be accommodated in the shell. Since the electrolyte will be lost during the charging and discharging process of the battery cell, when there is more electrolyte, the service life of the battery cell can be extended; and because the third receiving groove can be connected to the inside of the shell through the perforation, the third receiving groove can also be used as a storage and buffer structure for the gas generated inside the battery core assembly, reducing the expansion of the battery cell.

[0048] In a third aspect, an embodiment of the present application provides a battery, comprising the above-mentioned battery cell.

[0049] In the above technical solution, the battery adopts the above battery monomer, which can improve the energy density and reliability of the battery.

[0050] 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, and the buffer portion is connected between the two connecting portions. At least a portion of the buffer portion protrudes toward the shell relative to the connecting portion and can be stretched and deformed.

[0051] 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 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 on 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.

[0052] In a fourth aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery.

[0053] 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

[0054] 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:

[0055] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0056] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0057] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0058] Figure 4 A schematic diagram of the structure of a housing assembly provided in some embodiments of the present application;

[0059] Figure 5 for Figure 4 Another schematic diagram of the housing assembly shown in ;

[0060] Figure 6 For along Figure 5 Sectional view along line AA;

[0061] Figure 7 for Figure 6 An enlarged view of the circled section B;

[0062] Figure 8 for Figure 4 A schematic diagram of the housing shown in ;

[0063] Fig. 9 for Figure 8 A partial cross-sectional view of the housing shown in ;

[0064] Fig.10 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0065] Fig.11 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0066] Fig.12 for Fig.11 The enlarged view of the C section circled in the middle;

[0067] Fig.13 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0068] Fig.14 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0069] Fig.15 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0070] Fig.16 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0071] Fig.17 A partial schematic diagram of a battery provided for some embodiments of the present application;

[0072] Fig.18 for Fig.17 Another partial schematic diagram of the battery shown in;

[0073] Fig.19 for Fig.17 Another schematic diagram of the battery shown in .

[0074] Reference numerals:

[0075] The electric device 1000, the controller 300, the motor 400, the battery 200, the battery cell 100, the housing 101, the first housing 101a, the second housing 101b, the converging member 102, the buffer part 1021, the connecting part 1022,

[0076] Shell assembly 10, shell 11, shell body 11a, cover plate 11b, first shell wall 111, first accommodating groove 111a, mounting through hole 111b, central axis L of mounting through hole, main body 1111, flat part 1111a, fillet part 1111b, fillet surface 1111c, accommodating part 1112, end wall 1112a, side wall 1112b, second shell wall 112, first pole 12, third accommodating groove 12a, through hole 12b, fourth accommodating groove 12c, pole body 121, first extension platform 122, second extension platform 123, pole cover plate 124, insulating sealing structure 13, first matching structure 131, second matching structure 132, insulating structure 14, first insulating part 141, second insulating part 142, bracket 15, explosion-proof valve 16,

[0077] The battery cell assembly 20 , the active material coating portion 21 , the current collector 211 , the active material layer 212 , the conductive portion 22 , the pole ear portion 221 , the first gathering portion 2211 , the second gathering portion 2212 , and the adapter sheet 222 . DETAILED DESCRIPTION

[0078] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0079] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0080] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0081] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0082] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0083] The term "plurality" used in the present application refers to two or more (including two).

[0084] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0085] The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. The battery generally includes a box for encapsulating multiple battery cells or multiple battery modules, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may not include a box.

[0086] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator. The material of the shell may be aluminum, but is not limited thereto.

[0087] Among them, the positive electrode sheet can generally include 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 sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0088] 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 sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0089] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, batteries, as the core components of new energy vehicles, have high requirements in terms of energy density and reliability.

[0090] 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 is difficult to improve.

[0091] Based on the above considerations, in order to suppress the thermal diffusion of the battery, a shell assembly is proposed, the shell assembly 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, 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.

[0092] 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, thereby improving the volume energy density of the battery cell.

[0093] The embodiment of the present application provides an electric device using the battery disclosed in the present application as a power source, and 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 car, 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 may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric 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.

[0094] 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.

[0095] Please refer to Figure 1 , Figure 1 The power consumption device 1000 provided for some embodiments of the present application is a structural schematic diagram of 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 be used not only 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.

[0096] Please refer to Figure 2 , Figure 2 The battery cell 100 provided in some embodiments of the present application is used for the structural explosion diagram of the battery 200. The battery 200 includes a box 101 and a plurality of battery cells 100, and the battery cells 100 are accommodated in the box 101. Among them, the box 101 is used to provide an assembly space for the battery cells 100, and the box 101 can adopt a variety of structures. In some embodiments, the box 101 may include a first box 101a and a second box 101b, the first box 101a and the second box 101b cover each other, and the first box 101a and the second box 101b jointly define a storage space for accommodating battery cells. The second box 101b may be a hollow structure with one end open, and the first box 101a may be a plate-like structure, and the first box 101a covers the open side of the second box 101b, so that the first box 101a and the second box 101b together define a storage space; or the first box 101a and the second box 101b may both be hollow structures with one end open (for example, Figure 2 As shown in FIG. 1 , the open side of the first box body 101a covers the open side of the second box body 101b. Of course, the box body 101 formed by the first box body 101a and the second box body 101b can be in various shapes, such as a cylinder or a cuboid.

[0097] In the battery 200, multiple battery cells 100 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 100 are connected in series and in parallel. Multiple battery cells 100 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 100 is accommodated in the box 101; or, the battery 200 can also be a battery module formed by multiple battery cells 100 connected in series, in parallel or in a mixed connection, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 101. The battery 200 may also include other structures. For example, the battery 200 may also include a converging component 102 for realizing electrical connection between multiple battery cells 100.

[0098] Please refer to Figure 3 and Figure 4 , the battery cell is a rectangular parallelepiped, and the height direction of the battery cell is the third direction Z, the length direction of the battery cell is the first direction X, and the thickness direction of the battery cell is the second direction Y. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. However, it is not limited to this. In other embodiments of the present application, the battery cell can also be a cylinder, a polygonal prism, a flat body, or other shapes.

[0099] Please refer to Figure 4-Figure 7 and Fig.10 In the embodiment of the present application, the housing assembly 10 includes a housing 11 and a first pole 12 disposed on the housing 11 .

[0100] The shell 11 is provided with a pole, which is used to electrically connect with the battery cell assembly 20 of the battery cell 100 to realize 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 are different from the first pole 12 in structure. For the convenience of description, in the following description of the present application, it is taken as an example that all poles on the shell 11 are first poles 12.

[0101] The housing 11 includes a first housing wall 111, and the first housing wall 111 is formed with a first receiving groove 111a. The notch of the first receiving groove 111a is formed on the outer surface of the first housing wall 111 (eg, Fig.10 As shown), or, the notch of the first receiving groove 111a is formed on the inner surface of the first shell wall 111 (as shown Figure 7 and Fig. 9As shown in the figure, a mounting through hole 111b is formed on the bottom wall of the first accommodating groove 111a. 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 groove opening. 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.

[0102] 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 the notch open upward and the groove wall concave downward; or, 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 the notch open downward and the groove wall concave upward. Of course, the first shell wall 111 can also be the side wall or bottom wall of the shell 11.

[0103] Please refer to Figure 6 and Figure 7 The first pole 12 includes a pole body 121 and a first extension platform 122. The pole body 121 is inserted into the mounting through hole 111b, that is, at least part of the pole body 121 is located in the mounting through hole 111b, and the axial direction of the mounting through hole 111b is used as the projection direction, and the plane perpendicular to the axial direction of the mounting through hole 111b is used 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 through hole 111b on the projection plane, so that the pole body 121 can be inserted into the mounting through 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 through hole 111b. For example, the first extension platform 122 can extend along the radial direction of the mounting through hole 111b and in a direction away from the central axis L of the mounting through hole 111b. The first extension platform 122 is arranged on a side of the first shell 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 outer side 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 inner side of the inner surface of the first shell wall 111.

[0104] It can be seen that the provision of the first extension platform 122 can increase the overall structural strength of the first pole 12 to a certain extent, improve the reliability of the first pole 12, and at the same time help 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, thereby improving the installation reliability of the first pole 12.

[0105] The two side surfaces of the first shell wall 111 in the wall thickness direction are respectively the outer surface and the inner surface, a receiving cavity is formed inside the shell 11, and the active material coating part 21 of the battery cell can be received in the receiving cavity, the inner surface is the side surface of the first shell wall 111 facing the receiving cavity, the outer surface is the side surface of the first shell wall 111 facing away from the receiving cavity, the side of the outer surface 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 platform 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 part of the first extension platform 122 is directly opposite to the first shell wall 111, the axial direction of the mounting through hole 111b is the projection direction, the plane perpendicular to the axial direction of the mounting through hole 111b is the projection plane, the projection of the first extension platform 122 on the projection plane and the projection of the first shell wall 111 on the projection plane have an intersection area, and the part of the first extension platform 122 corresponding to the intersection area is directly opposite to the first shell wall 111.

[0106] For example, in combination 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. 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.

[0107] 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.

[0108] Please refer to Figure 6 and Figure 7 In the embodiment of the present application, the housing assembly 10 further includes an insulating sealing structure 13, and the insulating sealing structure 13 includes a first matching structure 131, and the first matching structure 131 is matched between the first housing wall 111 and the first extension platform 122. It can be seen that the first matching 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 matched through the first matching structure 131 to achieve insulation and sealing between the first housing wall 111 and the first extension platform 122.

[0109] Among them, at least a part 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 part of the first matching structure 131 is accommodated in the first accommodating groove 111a.

[0110] 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 portion of the first matching structure 131 is accommodated in the first accommodating groove 111a.

[0111] For example, in combination Figure 6 and Figure 7 , the first shell wall 111 is the top wall of the shell 11, the notch of the first receiving groove 111a is formed on the lower surface of the first shell wall 111, at this time, the bottom wall of the first receiving groove 111a is located above the notch of the first receiving groove 111a, and the distance between the notch of the first receiving groove 111a and the bottom wall of the first receiving groove 111a in the up-down direction is the depth H of the first receiving groove 111a, and the thickness of the first matching structure 131 in the up-down direction is less than the depth H of the first receiving groove 111a (such as Fig.13 ), or the thickness of the first matching structure 131 in the vertical direction is greater than the depth H of the first receiving groove 111a (as shown in Fig.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.

[0112] In the above technical solution, by accommodating at least a portion of the first matching structure 131 in the first accommodating groove 111a, so that on the premise that the shell 11 provides sufficient arrangement space for the battery cell assembly 20 of the battery cell 100, the shell 11 can also provide an arrangement space for at least a portion of the first matching structure 131. The portion of the first matching structure 131 located in the first accommodating groove 111a will not occupy the arrangement 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.

[0113] For example, by setting a first accommodating groove 111a on the inner side of the first shell wall 111 to accommodate at least a portion of the first matching structure 131, the occupation of the first matching structure 131 on the arrangement space provided by the shell 11 for the battery cell assembly 20 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 a portion of the first matching structure 131 is obviously beneficial to improving the energy density.

[0114] For another example, when the size of the arrangement space provided for the battery cell assembly 20 inside the shell 11 is fixed, by providing a first accommodating groove 111a on the outside of the first shell wall 11 to accommodate at least a portion 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 is arranged to protrude 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, thereby reducing 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 also improving the volume energy density of the battery 100.

[0115] Please refer to Fig.13 In some embodiments, at least a portion of the first extension platform 122 is accommodated in the first receiving groove 111a, that is, the first extension platform 122 can be fully accommodated in the first receiving groove 111a, or a portion of the first extension platform 122 can be accommodated in the first receiving groove 111a. In this solution, the notch of the first receiving groove 111a can be 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, such as Fig.13Alternatively, 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 at least a portion of the first extension platform 122 is accommodated in the first accommodating groove 111a.

[0116] Taking the bottom wall of the first receiving 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 receiving groove 111a) 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, 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 receiving groove 111a and the bottom wall of the first receiving groove 111a is less than or equal to the depth H of the first receiving 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 receiving 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.

[0117] 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 can provide 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 beneficial to further improve the volume energy density of the battery cell 100.

[0118] For example, by setting a first accommodating groove 111a on the inner side of the first shell wall 111 to accommodate at least a portion of the first matching structure 131 and at least a portion 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 a larger size of battery cell assembly 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.

[0119] For another example, when the size of the layout space provided for the battery cell assembly 20 inside the shell 11 is fixed, by providing a first accommodating groove 111a on the outside of the first shell wall 11 to accommodate at least a portion of the first matching structure 131 and at least a portion 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.

[0120] For example, in the wall thickness direction of the first shell wall 111, the thickness of at least a portion of the first matching structure 131 is less than the depth H of the first receiving groove 111a, so that at least a portion of the first extension platform 122 is received in the first receiving groove 111a. Of course, the manner in which at least a portion of the first extension platform 122 is received in the first receiving groove 111a is not limited thereto; for example, the first extension platform 122 needs to form a protrusion on the side of the first extension platform 122 facing the first shell wall 111 due to design requirements, and the protrusion and the first matching structure 131 are sequentially arranged along the radial direction of the mounting through hole 111b, and in order to improve the energy density of the battery cell, the distance between a side surface 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 received in the first receiving groove 111a, and at this time, the thickness of at least a portion of the first matching structure 131 can be less than, equal to, or greater than the depth H of the first receiving groove 111a.

[0121] In other embodiments of the present application, when the first matching structure 131 is at least partially accommodated in the first accommodating groove 111a, the first extension platform 122 may also be configured to be not accommodated in the first accommodating groove 111a (e.g. Figure 7 and Fig.10 For example, in the wall thickness direction of the first shell wall 111, the thickness of the at least part of the first matching 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.

[0122] 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.

[0123] 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 receiving groove 111a, so that at least the portion of the first extension platform 122 facing the bottom wall of the first receiving groove 111a is accommodated in the first receiving groove 111a, and the first extension platform 122 is not easy to interfere with the groove wall of the first receiving 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 receiving groove 111a.

[0124] In addition, in the above technical solution, there are no excessive restrictions on the structure of the first extension platform 122, so the above arrangement can be applied to first extension platforms 122 of various structural shapes, so as to realize flexible arrangement of the first pole 12. For example, Figure 3 and Figure 7 As shown, 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 a 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 a 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, and 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.

[0125] Of course, when the first extension platform 122 is configured to be not accommodated in the first accommodation groove 111a, please refer to Figure 7 and Fig.10 On a plane perpendicular to the central axis L of the mounting through hole 111 b , the orthographic projection of the first extension platform 122 is located within the orthographic projection outer contour of the peripheral wall of the first receiving groove 111 a .

[0126] In some embodiments, the first extension platform 122 is located at the axial end of the pole body 121, and the first extension platform 122 is located at the end of the pole body 121 facing the inside of the shell 11; the depth H of the first receiving groove 111a is greater than the sum of the thickness of the at least part of the first matching structure 131 and the first extension platform 122 in the axial direction of the installation through hole 111b, that is, H>T1+T2, T1 is the thickness of the at least part of the first matching structure 131 in the axial direction of the installation through hole 111b, and T2 is the thickness of the first extension platform 122 in the axial direction of the installation through hole 111b. In this solution, the notch of the first receiving groove 111a can be formed on the inner surface of the first shell wall 111, or on the outer surface of the first shell wall 111.

[0127] In the above technical solution, by arranging the first extension platform 122 at one end of the pole body 121 facing the inside 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 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 a 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 other components or a part of the above 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, so as to further improve the volume energy density of the battery cell 100 or improve the volume energy density of the battery 200.

[0128] 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, and 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.

[0129] Please refer to Figure 7-Figure 9In some embodiments, the first shell wall 111 includes a main body portion 1111 and a receiving portion 1112, and the main body portion 1111 is arranged around the receiving portion 1112, then the main body portion 1111 is roughly formed into an annular structure, and the receiving portion 1112 includes an end wall 1112a and a side wall 1112b, and 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, and the mounting through hole 111b is formed on the end wall 1112a; wherein, a side surface of the end wall 1112a facing away from the side wall 1112b is protruding from the surface of the main body 1111.

[0130] 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.

[0131] 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 peripheral edge 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 the processing convenience; at the same time, since the surface of the side of the end wall 1112a away from the side wall 1112b is protruding from the surface of the main body 1111, it is conducive to appropriately increase the thickness of the end wall 1112a, improve 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, and improve the balance of the structural strength of the first shell wall 111.

[0132] 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 arranged flush with the surface of the main body 1111.

[0133] In the above technical solution, the main body 1111 is arranged around the accommodating portion 1112, which is also convenient for processing the accommodating portion 1112 by clamping and fixing the main body 1111, thereby improving the processing convenience; and since the side surface of the end wall 1112a that is away from the side wall 1112b is arranged flush with the surface of the main body 1111, the material amount of the first shell wall 111 is saved and the cost is reduced under the premise that the first pole 12 is reliably installed.

[0134] Please refer to Fig. 9 In some embodiments, 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, that is, T3≥T5, T4≥T5.

[0135] 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 beneficial to improving the installation reliability of the first pole 12.

[0136] 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 that is 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 that is 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.

[0137] Please refer 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.

[0138] 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 by the internal space or external space of the shell 11.

[0139] 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.

[0140] Please refer to Fig. 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.

[0141] 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, during the forming process of the accommodating portion 1112, the main body 1111 can be subjected to a crimping operation so as to achieve a sufficient crimping 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, making it less likely for the main body 1111 to be deformed.

[0142] Exemplarily, the minimum distance between the outer circumference of the accommodating portion 1112 and the outer circumference 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.

[0143] 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 the accommodating portion 1112 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.

[0144] Then, when other components such as explosion-proof valve 16 are provided on first shell wall 111, the minimum width of the portion of main body 1111 between receiving portion 1112 and the other components is also greater than 0.5 mm. In short, for receiving portion 1112, the portion of main body 1111 connected to receiving portion 1112 and surrounding receiving portion 1112 reserves at least 0.5 mm of width for receiving portion 1112.

[0145] Please refer to Figure 4 and Fig. 9 In some embodiments, the shell 11 further includes a second shell wall 112 adjacent to the first shell wall 111 , and at least a portion of the outer surface of the main body 1111 is formed as a rounded surface 1111 c , which is connected to the outer surface of the second shell wall 112 .

[0146] It can be seen that in the radial direction of the mounting through hole 111 b , the minimum width of the portion of the body portion 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 fillet surface 1111 c .

[0147] 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 portion 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 molding process of the accommodating portion 1112, the main body 1111 can be subjected to a crimping operation to achieve a sufficient crimping width, thereby improving the operational feasibility of stretching or stamping the accommodating portion 1112.

[0148] 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 subjected to a crimping operation; and 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, so as to further improve the convenience of crimping.

[0149] It can be understood that the second shell wall 112 and the first shell wall 111 can be an integrally formed part or a separate structural part.

[0150] 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 a fixing means; or Figure 4 and Figure 6 As shown, there are one or more second shell walls 112 , the first shell wall 111 and at least one second shell wall 112 are integrally formed, and the second shell wall 112 extends toward one side of the first shell wall 111 in the thickness direction.

[0151] Exemplarily, when the first shell wall 111 is rectangular, each of the four edges of the first shell wall 111 is respectively 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 or separately arranged with the first shell wall 111.

[0152] For example, combined 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, 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 may 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 the second shell wall 112.

[0153] Please refer to Figure 7-Figure 9 In some embodiments, the body 1111 includes a flat portion 1111a and a rounded portion 1111b, the flat portion 1111a is connected to the second shell wall 112 through the rounded portion 1111b, and the outer surface of the rounded portion 1111b is formed as a rounded surface 1111c. It can be seen that in the radial direction of the mounting through hole 111b, the flat portion 1111a is arranged on the radial inner side of the rounded portion 1111b, and the flat portion 1111a is arranged around the accommodating portion 1112.

[0154] 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 edge pressing operation, the main body 1111 can provide a larger edge pressing width, so as to further improve the convenience of edge pressing.

[0155] 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.

[0156] Please refer to Figure 6 and Figure 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 peripheral edge of the first extension platform 122; the shell assembly 10 also includes: an insulating structure 14, which is arranged at the outer peripheral edge of the first extension platform 122 and is at least partially matched between the first extension platform 122 and the first shell wall 111.

[0157] 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 .

[0158] In the above technical solution, the first matching structure 131 and the outer periphery of the first extension platform 122 are arranged at intervals in the radial direction of the installation 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 on the premise of achieving a sealed setting between the first pole 12 and the first shell wall 11; and the insulating structure 14 is arranged at the outer periphery of the first extension platform 122, and at least part 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 the outer periphery of the first extension platform 122 and the first shell wall 111 being easily contacted due to the large deformation of the first matching structure 131, and improve the safety of the battery cell 100.

[0159] 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 111 b , the first matching portion 131 extends to the outer peripheral edge of the first extension platform 122 , and in this case, the insulating structure 14 may not be required.

[0160] 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, so as to appropriately reduce the extension width of the first extension platform 122 and reduce costs while achieving 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 also does not require at least a portion of the first extension platform 122 to be accommodated in the first accommodating groove 111a.

[0161] Combination Figure 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 fitted between the bottom wall of the first accommodating groove 111a 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.

[0162] In the above technical solution, an insulating structure 14 is provided including a first insulating part 141 and a second insulating part 142 so as to enhance the insulating protection effect of the insulating structure 14 on the first extension platform 122, reduce the risk of contact between the first extension platform 122 and 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.

[0163] Please refer to Figure 7 and Fig.12 In some embodiments, the shell assembly 10 further includes a bracket 15 , which is disposed in the shell 11 , and the bracket 15 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 .

[0164] 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 the two are connected.

[0165] 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.

[0166] Optionally, the bracket 15 is a plastic part. Exemplarily, 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.

[0167] Optionally, 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 this case, during the assembly process of the battery cell 100, the bracket 15 and the battery cell assembly 20 can be pre-installed first, and then the pre-installed structure consisting 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 probability of the active material coating portion 21 being scratched and damaged by the shell 11.

[0168] Furthermore, the battery cell 100 may include an insulating film, which is arranged in 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.

[0169] Please refer 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, and 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.

[0170] 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.

[0171] Combination Figure 7The insulating sealing structure 13 includes a second matching structure 132, and the second matching structure 132 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.

[0172] In the above technical solution, the first pole 12 is also 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 realized through the second matching structure 132, thereby improving the reliability of the battery cell 100.

[0173] In some embodiments, Figure 7 As shown, 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, and the first pole 12 is formed by flanging and riveting to form the second extension platform 123. Specifically, after the first pole 12 is assembled to the mounting through hole 111b through the pole body 121, the second extension platform 123 is manufactured by the flanging and riveting process, so as to realize the riveting fixation of the first pole 12 and the first shell wall 111, and the assembly is convenient and reliable.

[0174] 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 may include a part of the pole body 121 and the first extension platform 122, and the other part may include another part of the pole body 121 and the second extension platform 123.

[0175] In some embodiments, the first shell wall 111 is also formed with a second accommodating groove (not shown in the figure), the notch of the first accommodating groove 111a is formed on the inner surface of the first shell wall 111, and the notch of the second accommodating groove is formed on the outer surface of the first shell wall 111, and the second extension platform 123 extends to the outside of the outer surface of the first shell wall 111, and at least a portion 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.

[0176] 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.

[0177] Optionally, 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 portion of the bottom wall of the second accommodating groove, or the bottom wall of the second accommodating groove is at least a portion 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.

[0178] In the above technical solution, by accommodating at least a portion 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 for 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 for the external space of the shell 11, thereby facilitating further improving the volume energy density of the battery cell 100.

[0179] On the second aspect, the embodiment of the present application provides a battery cell 100, including a battery cell assembly 20 and the above-mentioned shell assembly 10, the battery cell assembly 20 includes 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 battery 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.

[0180] It can be understood that both the first pole 12 and the second pole 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.

[0181] It should be noted that in the embodiment of the present application, the active material coating part 21 can be divided into a positive electrode active material coating part and a negative electrode active material coating part, the positive electrode active material coating part includes a portion of the positive electrode current collector coated with a positive electrode active material layer 212, and the negative electrode active material coating part includes a portion of the negative electrode current collector coated with a negative electrode active material layer 212. The conductive part 22 is divided into a positive electrode conductive part and a negative electrode conductive part, the positive electrode conductive part electrically connects the positive electrode active material coating part and the positive electrode pole, and the negative electrode conductive part electrically connects the negative electrode active material coating part and the negative electrode pole.

[0182] Obviously, 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 notch 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 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 notch 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).

[0183] In the above technical solution, since the battery cell 100 adopts the above shell assembly 10 , the volume energy density of the battery cell 100 can be improved.

[0184] It is understandable that in the embodiment of the present application, the shape of the shell 11 is adjusted according to the type of the battery cell 100; for example, when the battery cell 100 is a square battery, the shell 11 is square, and when the battery cell 100 is a cylindrical battery, the shell 11 is cylindrical.

[0185] Please refer to Fig.11 and Fig.12 In the first 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 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 positions 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 positions away from the current collector 211 and are connected to form a second gathered portion 2212, and the first gathered portion 2211 connects the second gathered portion 2212 and the active material coating portion 21.

[0186] It can be seen that the plurality of tabs are only brought together but not connected when forming the first gathered portion, while the plurality of tabs are not only brought together but also connected into an integrated structure when forming the second gathered portion 2212. For example, the plurality of tabs are connected into an integrated plate structure by welding, conductive adhesive bonding, etc. to form the second gathered portion 2212.

[0187] Among them, “a plurality of pole tabs converge at positions close to the current collector 211 to form a first gathered portion 2211, and a plurality of pole tabs converge at positions away from the current collector 211 and connect to form a second gathered portion 2212” can be understood as, along the extension direction of the pole tab, the first gathered portion 2211 and the second gathered portion 2212 are sequentially arranged in a direction away from the current collector 211. The pole tab and the current collector 211 can be an integral part or a separate part.

[0188] It should be noted that in the embodiments of the present application, the pole tab sheets are respectively positive pole tab sheets and negative pole tab sheets. The positive pole tab sheets that need to be gathered together are stacked and pre-welded to form a second gathered portion of the positive electrode to reduce the interlayer gap so that the fluffy multiple positive pole tab sheets form a plate structure with a certain rigidity; similarly, the negative pole tab sheets are also processed as described above.

[0189] Among them, combined Fig.14 The notch of the first receiving groove 111a is formed on the inner surface of the first shell wall 111, and at least part of the second gathering portion 2212 is received in the first receiving groove 111a, that is, part or all of the second gathering portion 2212 can be received in the first receiving groove 111a.

[0190] Taking the bottom wall of the first receiving groove 111a as a reference, the distance between the end of the second gathering portion 2212 (i.e., the portion of the second gathering portion 2212 accommodated in the first receiving groove 111a) 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, and the distance between the end of the second gathering portion 2212 facing away from the bottom wall of the first receiving groove 111a and the bottom wall of the first receiving groove 111a is less than or equal to the depth of the first receiving 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 receiving groove 111a.

[0191] In the above technical solution, a plurality of pole ear sheets are arranged to converge near the current collector 211 to form a second gathered portion 2212, 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 ear 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.

[0192] It can be understood that in the first embodiment, when at least a portion of the second gathering portion 2212 is accommodated in the first receiving groove 111a, the embodiments of the present application may include the following schemes: 1. At least a portion of the first matching structure 131 is accommodated in the first receiving groove 111a, and the first extension platform 122 is not accommodated in the first receiving 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 receiving groove 111a.

[0193] Of course, in other embodiments, in the first embodiment, the second gathering portion 2212 can also be arranged outside the first receiving 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 receiving groove 111a, and the first extension platform 122 is not accommodated in the first receiving 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 receiving groove 111a.

[0194] 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 provided 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 provided 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.

[0195] Please refer to Fig.15 In some embodiments, the conductive portion 22 further includes an adapter plate 222, which is connected to the second retracted portion 2212. The conductive portion 22 is electrically connected to the first pole 12 via the adapter plate 222. At least a portion of the adapter plate 222 is accommodated in the first accommodating groove 111a. Then, all or part of the adapter plate 222 can be accommodated in the first accommodating groove 111a.

[0196] Taking the bottom wall of the first receiving groove 111a as a reference, the distance between one 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 receiving groove 111a) 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, and the distance between one end of the above-mentioned at least part of the adapter plate 222 away from the bottom wall of the first receiving groove 111a and the bottom wall of the first receiving groove 111a is less than or equal to the depth of the first receiving 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 receiving groove 111a.

[0197] In the above technical solution, the second folding 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 in 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.

[0198] 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 sheet 222 .

[0199] It can be understood that when at least a portion of the adapter plate 222 is accommodated in the first receiving 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 receiving groove 111a, and the first extension platform 122 is not accommodated in the first receiving 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 receiving groove 111a.

[0200] Of course, in other embodiments, the adapter plate 222 can also be arranged outside the first receiving 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 receiving groove 111a, and the first extension platform 122 is not accommodated in the first receiving 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 receiving groove 111a.

[0201] 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.

[0202] Please refer to Fig.16 In some embodiments, a portion of the first gathering portion 2211 is received in the first receiving groove 111 a, and another portion of the first gathering portion 2211 is located outside the first receiving groove 111 a.

[0203] Taking the bottom wall of the first receiving groove 111a as a reference, the distance between one 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 receiving groove 111a) 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, and the distance between one end of the above-mentioned part of the first gathering portion 2211 facing away from the bottom wall of the first receiving groove 111a and the bottom wall of the first receiving groove 111a is equal to the depth of the first receiving groove 111a.

[0204] In the above technical solution, a part of the first folded portion 2211 is accommodated in the first accommodating groove 111a to further reduce the occupancy of the pole ear portion 221 on 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.

[0205] In other embodiments of the present application, the first gathering portion 2211 may also be disposed outside the first receiving groove 111 a.

[0206] In some embodiments, in the first embodiment, at least a portion of the adapter plate 222 and a portion of the first folded portion 2211 are both accommodated in the first accommodating groove 111 a.

[0207] Please refer to Fig.15 In the 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 pole ear portion 221 and a transfer sheet 222, the pole ear portion 221 includes a plurality of pole ear sheets electrically connected to the current collector 211, the plurality of pole ear sheets converge at positions close to the current collector 211 to form a first gathered portion 2211, the plurality of pole ear sheets converge at positions away from the current collector 211 and are connected to form a second gathered portion 2212, and the transfer sheet 222 is electrically connected to the second gathered portion 2212,

[0208] Among them, combined Fig.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 .

[0209] Taking the bottom wall of the first receiving groove 111a as a reference, the distance between one 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 receiving groove 111a) 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, and the distance between one end of the above-mentioned at least part of the adapter plate 222 away from the bottom wall of the first receiving groove 111a and the bottom wall of the first receiving groove 111a is less than or equal to the depth of the first receiving 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 receiving groove 111a.

[0210] In the above technical solution, by accommodating at least a portion of the adapter plate 222 in the first accommodating groove 111a, the occupation of the conductive part 22 in the arrangement space provided for the battery cell assembly 20 inside the shell 11 is reduced, which is beneficial to further improve the volume energy density of the battery cell 100.

[0211] It is worth noting that, in the second embodiment, the setting position of the adapter plate 222 is also not directly related to the setting position 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 arranged outside the first receiving groove 111a, or at least a portion of the first extension platform 122 is accommodated in the first receiving groove 111a. Of course, in the second embodiment, the adapter plate 222 can also be arranged outside the first receiving groove 111a, in which case the first extension platform 122 can be arranged outside the first receiving groove 111a, or at least a portion of the first extension platform 122 is accommodated in the first receiving groove 111a.

[0212] It can be understood that, in the second embodiment, at least part of the second gathering portion 2212 can be accommodated in the first receiving groove 111a, or the second gathering portion 2212 is disposed outside the first receiving groove 111a. Similarly, in the second embodiment, part of the first gathering portion 2211 can be accommodated in the first receiving groove 111a, or the first gathering portion 2211 is disposed outside the first receiving groove 111a. Exemplarily, in the second embodiment: 1. At least part of the second gathering portion 2212 is accommodated in the first receiving groove 111a, and the first gathering portion 2211 is disposed outside the first receiving groove 111a; 2. At least part of the second gathering portion 2212 and part of the first gathering portion 2211 are both accommodated in the first receiving groove 111a; 3. The first gathering portion 2211 and the second gathering portion 2212 are both disposed outside the first receiving groove 111a.

[0213] Please refer to Figure 12-16In 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.

[0214] In the above technical scheme, by providing the third receiving 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 receiving 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 receiving groove 12a, it is convenient to store and organize the conductive part 22 through the notch of the third receiving groove 12a, or to electrically connect the conductive part 22 to 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 with the interior of the shell 11 through the perforation 12b, the third receiving groove 12a can also be used as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the electrolyte will be consumed during the charging and discharging process of the battery cell 100, when there is more electrolyte, the service life of the battery cell 100 can be extended; and also because the third receiving groove 12a can be connected with the interior of the shell 11 through the perforation 12b, the third receiving groove 12a can also be used as a receiving and buffer structure for gas production inside the battery cell assembly 20, thereby reducing the expansion of the battery cell 100.

[0215] It can be understood that the above technical solution is applicable to both the first embodiment and the second embodiment mentioned above.

[0216] Exemplarily, the first pole 12 may further include a pole cover 124 , and the pole cover 124 is disposed on a notch of the third receiving groove 12 a to close the third receiving groove 12 a .

[0217] Of course, the connection arrangement between the conductive part 22 and the first pole 12 is not limited thereto. For example, the conductive part 22 can also be directly electrically connected to the end of the first pole 12 facing the active material coating part 21, in which case the conductive part 22 does not need to be provided in the through hole 12b; or Fig.10 As shown, a fourth receiving groove 12c is formed on the side of the first pole 12 facing the active material coating portion 21, and the notch of the fourth receiving groove 12c is formed on the surface of the side of the first pole 12 facing the active material coating portion 21, at least a portion of the second gathering portion 2212 is received in the fourth receiving groove 12c, and the conductive portion 22 is electrically connected to the bottom wall of the side of the fourth receiving groove 12c away from the active material coating portion 21.

[0218] Optionally, the depth H of the first receiving groove 111a is less than (the thickness of the first matching structure 131 in the axial direction of the mounting through hole 111b + the thickness of the first extension platform 122 in the axial direction of the mounting through hole 111b + Δ), and the first receiving groove 111a can at least accommodate at least part of the first matching structure 131, for example, the first receiving groove 111a accommodates at least part of the first matching structure 131 and does not accommodate the first extension platform 122, or the first receiving groove 111a accommodates at least part of the first matching structure 131 and the first extension platform 122, and does not accommodate the conductive part 22, or the first receiving groove 111a accommodates the first matching structure 131, at least part of the first extension platform 122, and at least part of the conductive part 22. It can be seen that the value of Δ can be related to the maximum required height of the conductive part 22, for example, Δ can be 5.5 mm, but is not limited thereto.

[0219] In a third aspect, an embodiment of the present application provides a battery 200 including the above-mentioned battery cell 100 .

[0220] 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.

[0221] Please refer to Figure 16-Figure 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 reflux 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, 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, then at least a portion of the buffer portion 1021 has a certain stretching deformation ability under the action of external force.

[0222] 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, and 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, and 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 corresponding portion of the shell 11. The space corresponding to the portion 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.

[0223] 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 .

[0224] 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.

[0225] In the above technical solution, since the electric device 1000 adopts the above battery 200, the battery life and reliability of the electric device 1000 can be improved.

[0226] Please refer again Figure 7 , Fig.10 and Fig.11 , describing a battery cell 100 according to a specific embodiment of the present application.

[0227] In the embodiment of the present application, the battery cell 100 includes a housing assembly 10 and a cell assembly 20. The housing assembly 10 includes a housing 11, a first pole 12, an insulating sealing structure 13, an insulating structure 14 and a bracket 15, and the cell assembly 20 includes an active material coating portion 21 and a conductive portion 22, wherein the active material coating portion 21 is disposed in the housing 11, and the conductive portion 22 electrically connects the active material coating portion 21 with the first pole 12.

[0228] 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 housing body 11a opposite to the open side 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 penetrated by the mounting through 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 through 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.

[0229] The insulating sealing structure 13 includes a first matching structure 131 and a second matching structure 132. The first matching structure 131 is matched between the first shell wall 111 and the first extension platform 122, and the second matching structure 132 is matched between the first shell wall 111 and the second extension platform 123. On a plane perpendicular to the central axis L of the mounting through hole 111b, the orthographic projection of the first extension platform 122 and the orthographic projection of the second extension platform 123 are both located within the range surrounded by the orthographic projection of the side wall 1112b. In the radial direction of the mounting through hole 111b, the first matching structure 131 is spaced from the outer periphery of the first extension platform 122. The insulating structure 14 is arranged at the outer periphery of the first extension platform 122 and at least partially matched between the first extension platform 122 and the end wall 1112a. The bracket 15 is arranged in the shell 11 and matched with the battery 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 .

[0230] The housing assembly 10 may include a first insulating seal, at least part of which is configured as a first matching structure 131; illustratively, the first insulating seal includes a first matching structure 131 and a third matching structure, the third matching structure is connected to the radial inner side of the first matching structure 131, and the third matching structure is matched between the hole wall of the mounting through hole 111b and the pole body 121. The housing assembly 10 includes a second insulating seal, at least part of which is configured as a second matching structure 132; illustratively, the second insulating seal includes a second matching structure 132 and a fourth matching structure, the fourth matching structure is connected to the radial inner side of the second matching structure 132, and the fourth matching structure is matched to the outer peripheral wall of the second extension platform 123.

[0231] In the above technical solution, by setting the first accommodating groove 111a, the shell 11 also provides an arrangement space for at least part of the first matching structure 131 under the premise that the shell 11 provides sufficient arrangement space for the battery cell assembly 20. The part of the first matching structure 131 located in the first accommodating groove 111a will not occupy the arrangement space provided by the shell 11 for the battery cell assembly 20, thereby improving the volume energy density of the battery cell 100.

[0232] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can 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 changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A housing assembly, characterized in that: 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, characterized in that: At least a portion of the first extension platform is accommodated in the first accommodation groove.

3. The housing assembly according to claim 2, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, characterized in that: The main body and the accommodating portion are an integral structure formed by stamping or stretching.

8. The housing assembly according to claim 7, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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 claim 1, 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: A portion of the first folded portion is accommodated in the first accommodating groove.

21. The battery cell according to claim 17, characterized in that: 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, characterized in that: 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, characterized in that: Comprising a battery cell according to any one of claims 17-22.

24. The battery according to claim 23, characterized in that 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, characterized in that: Comprising a battery according to claim 23 or 24.

Images