Housing assembly, battery cell, battery, and electrical device

Abstract

Disclosed are a housing assembly (21), a battery cell (20), a battery (100), and an electrical device. The housing assembly (21) comprises a housing (211) and a terminal (212), wherein a hole (211a) is provided in the housing (211); and the terminal (212) comprises a main body portion (201), a connecting portion (202), and a bent portion (203), the main body portion (201) being located inside the housing (211), the connecting portion (202) passing through the hole (211a) and connecting the main body portion (201) and the bent portion (203), the bent portion (203) being located outside the housing (211), the bent portion (203) having an end portion close to the connecting portion (202), and a recess (212a) being provided on the side of the end portion close to the housing (211).

Description

Housing components, battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202420003437.X and application date of January 2, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. A battery consists of a housing and multiple battery cells housed within it. As a core component of new energy vehicles, batteries have high safety and service life requirements. However, during manufacturing, the battery cell terminals are fixed to the housing via riveted flanging. This process is difficult to form, and the reliability of the terminal after flanging is poor.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a housing assembly, a battery cell, a battery, and an electrical device, which can effectively reduce the difficulty of forming the terminal flanging and improve the reliability of the terminal after flanging.

[0007] In a first aspect, an embodiment of the present application provides a shell assembly, comprising: a shell, the shell being provided with a through hole; a pole, the pole comprising a main body, a connecting portion and a bending portion, the main body being located on the inner side of the shell, the connecting portion being passed through the through hole and connecting the main body and the bending portion, the bending portion having an end portion close to the connecting portion, and a recess being provided on the side of the end portion close to the shell.

[0008] In the above technical solution, the pole is provided to include a main body, a connecting portion and a bending portion, a recess is provided at the end of the bending portion close to the connecting portion, and the recess is located on the side of the end close to the shell. When the pole is riveted and flanged to form the bending portion and the connecting portion, the recess can reduce the influence of material extrusion on the bending of the pole to form the bending portion, and provide a guiding effect, which can reduce the difficulty of forming the bending portion of the pole. At the same time, the recess can form a relatively small bending angle between the bending portion and the connecting portion, that is, the bending portion can be close to parallel to the shell, which is beneficial to improve the clamping force of the bending portion on the seal in the through hole, thereby improving the reliability of the battery cell.

[0009] In some embodiments of the present application, the depth of the recess is T, and the thickness of the bent portion is H, where 0 < T / H ≤ 0.7. In this technical solution, by setting the ratio of the recess depth to the bent portion thickness within a range of 0.7 or less, the recess has an appropriate depth, which effectively reduces the difficulty of riveting and flanging the terminal, and ensures that the terminal has reliable strength after riveting and flanging, thereby improving the reliability of the terminal.

[0010] In some embodiments of the present application, the shell has a first wall, the through hole is provided on the first wall, the main body and the connecting portion enclose a receiving groove, which serves as a reference surface perpendicular to the first wall, and the projection of the recess on the reference surface is located within the projection of the receiving groove on the reference surface.

[0011] In the above technical solution, a reference surface perpendicular to the first wall is made, and the projection of the recess on the reference surface is located within the projection of the accommodating groove on the reference surface. This structure enables the cover plate to be installed in the accommodating groove to compensate for the strength weakened by the recess provided in the bending portion, which is beneficial to improving the strength of the position where the end of the bending portion is located, thereby improving the structural stability of the shell assembly.

[0012] In some embodiments of the present application, the housing assembly further includes a seal, which is sleeved over the connection portion and partially located between the bent portion and the housing. In this technical solution, the bent portion formed when the terminal is riveted and flanged can clamp the seal to the housing, allowing the seal to seal the gap between the via and the connection portion, reducing the risk of leakage in the housing assembly.

[0013] In some embodiments of the present application, the recess comprises one of a polygon, an arc polygon, and an arc. In this technical solution, by configuring the recess to comprise one of a polygon, an arc polygon, and an arc, the recess can have a variety of shapes, which can increase the variety of molding methods and reduce the molding difficulty.

[0014] Secondly, embodiments of the present application provide a battery cell comprising: a housing assembly as described above. In this technical solution, the use of the aforementioned housing assembly can reduce the difficulty of forming the riveted flange of the terminal, facilitate the formation of thicker bends, improve the connection reliability between the terminal and the housing, and enhance the reliability of the battery cell.

[0015] In some embodiments of the present application, the main body and the connecting portion enclose a receiving groove, and the battery cell further includes a cover plate, which is arranged to cover the receiving groove, and a welding portion is formed between the end away from the other side of the shell and the cover plate.

[0016] In the above technical solution, the weight of the pole can be reduced by providing an accommodating groove, which is beneficial to improving the energy density of the battery cell. By providing a cover plate to cover the accommodating groove, the cover plate can replace the pole to be welded with external conductors or busbars and other components, reducing the probability of separation between the pole and the conductive part of the electrode assembly, which is beneficial to improving the reliability of the battery cell. In addition, a recess is provided on one side of the end of the bent portion, and a welding portion is formed between the other side and the cover plate. Since the recess can improve the riveting and flanging quality of the pole, the forming quality of the bent portion is relatively high. When the end of the bent portion is welded to the cover plate, it is beneficial to improve the welding forming quality of the welding portion.

[0017] In some embodiments of the present application, the shell has a first wall, the through hole is provided on the first wall, and a reference plane perpendicular to the first wall is formed. The projection of the recess on the reference plane is located within the projection of the cover on the reference plane.

[0018] In the above technical solution, by making a reference surface perpendicular to the first wall, the projection of the recess on the reference surface is located within the projection of the cover plate on the reference surface. The use of this structure can enable the cover plate to strengthen the position corresponding to the recess on the bent portion, further improve the strength of the position where the end of the bent portion is located, thereby further improving the structural stability of the shell assembly.

[0019] In some embodiments of the present application, the main body is provided with a through hole, which is connected to the receiving groove; the battery cell includes an electrode assembly, the electrode assembly is arranged in the shell, and has a conductive part, the conductive part is passed through the through hole, and the part of the conductive part located in the receiving groove is electrically connected to the main body or the connecting part.

[0020] In the above technical solution, the accommodating groove can accommodate part of the conductive part, and the part of the conductive part after passing through the through hole can be arranged in the accommodating groove, thereby reducing the volume occupied by the conductive part in the shell, saving space in the shell, and being conducive to the arrangement of larger-sized electrode assemblies, further improving the energy density of the battery cell.

[0021] In a third aspect, an embodiment of the present application provides a battery comprising the battery cell described above. In this technical solution, the use of the battery cell described above can improve the overall reliability of the battery, thereby improving the battery's performance and extending its service life.

[0022] Fourthly, embodiments of the present application provide an electrical device comprising a battery cell as described above, or a battery as described above. In this technical solution, since the battery cell and battery described above have high reliability, this helps improve the reliability of the electrical device, enhance the performance of the battery, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0024] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0025] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0026] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0027] FIG4 is a top view of a battery cell provided in some embodiments of the present application;

[0028] FIG5 is a schematic diagram of FIG4 taken along line AA;

[0029] FIG6 is a partial enlarged schematic diagram of point I in FIG5;

[0030] FIG7 is a partial internal schematic diagram of a battery cell provided in some embodiments of the present application;

[0031] FIG8 is a schematic diagram of the structure of a pole without riveted flanges provided in some embodiments of the present application;

[0032] FIG9 is a schematic diagram of several structures of the concave portion on the pole provided in some embodiments of the present application.

[0033] Icons: 1000, vehicle; 100, battery; 10, casing; 11, first casing body; 12, second casing body; 20, battery cell; 21, casing assembly; 211, casing; 2111, first wall; 211a, via hole; 212, pole; 201, main body; 201a, through hole; 202, connecting part; 203, bending part; 204, protruding part; 212a, recess; 212b, receiving groove; 213, sealing part; 214, cover; 215, upper plastic part; 216, welding part; 22, electrode assembly; 221, conductive part; 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction; W, fourth direction. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0036] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0039] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0040] The term "plurality" used in this application refers to two or more (including two).

[0041] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0042] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0043] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0044] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0045] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and important role. A battery consists of a housing and multiple cells housed within it. As a core component in new energy vehicles, batteries have high requirements for both safety and cycle life.

[0046] The inventors discovered that in typical power batteries, the housing assembly of a battery cell includes a housing, a terminal, an upper plastic, and a sealing ring. The terminal clamps the upper plastic and sealing ring to the housing through a riveted flange, compressing the sealing ring and ensuring a tight seal. To ensure that the riveted flange of the terminal can clamp the upper plastic and sealing ring, a thicker flange provides a better clamping effect. However, a thicker flange increases the terminal's resistance to deformation and makes molding more difficult. This also affects the reliability of the terminal flange, and thus the reliability of the battery cell.

[0047] Based on the above considerations, in order to solve the problem that it is difficult to form thick flanging of the pole and the reliability of the pole after flanging, the utility model author designed a shell assembly, including a shell and a pole, and the shell is provided with a through hole; the pole includes a main body, a connecting part and a bending part, the main body is located on the inner side of the shell, the connecting part is passed through the through hole and connects the main body and the bending part, the bending part is located on the outer side of the shell, and the bending part has an end close to the connecting part, and a recess is provided on the side of the end close to the shell.

[0048] In a shell assembly of this structure, the pole is arranged to include a main body, a connecting portion and a bending portion, and a recess is arranged at the end of the bending portion close to the connecting portion, and the recess is located on the side of the end close to the shell. When the pole is riveted and flanged to form a bending portion and a connecting portion, the recess can reduce the influence of material extrusion on the bending of the pole to form the bending portion, thereby reducing the difficulty of forming the bending portion of the pole. At the same time, the recess can form a relatively small bending angle between the bending portion and the connecting portion, that is, the bending portion can be close to parallel to the shell, which can improve the clamping effect of the bending portion on the seal, and is beneficial to improving the reliability of the battery cell.

[0049] The batteries disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to form such electrical devices, thereby increasing the scope of application of the battery cells and batteries.

[0050] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0051] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0052] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0053] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0054] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a plurality of battery cells 20, which are intended to be accommodated within the housing 10. The housing 10 is used to provide an assembly space for the battery cells 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0055] In the battery 100, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting the multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure and housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0056] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes multiple rows of battery cells 20, which are arranged along the length of the housing 10, with each row of battery cells 20 including multiple battery cells 20 arranged along the width of the housing 10; or multiple rows of battery cells 20 are arranged along the width of the housing 10, with each row of battery cells 20 including multiple battery cells 20 arranged along the length of the housing 10.

[0057] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG2 , the battery cell 20 is in the shape of a rectangular parallelepiped.

[0058] According to some embodiments of the present application, referring to Figures 3 to 6, embodiments of the present application provide a shell assembly 21, including a shell 211 and a pole 212, the shell 211 is provided with a through hole 211a; the pole 212 includes a main body 201, a connecting portion 202 and a bending portion 203, the main body 201 is located on the inner side of the shell 211, the connecting portion 202 is passed through the through hole 211a, and connects the main body 201 and the bending portion 203, the bending portion 203 is located on the outer side of the shell 211, the bending portion 203 has an end close to the connecting portion 202, and a recess 212a is provided on the side of the end close to the shell.

[0059] It can be understood that the main body 201 is located on the inner side of the housing 211, and the bent portion 203 is located on the outer side of the housing 211. The main body 201 and the bent portion 203 cooperate with each other to fix the terminal 212 on the housing 211, thereby reducing the probability of the terminal 212 being separated from the housing 211. For example, referring to Figure 5, the main body 201 and the bent portion 203 can be located at both ends of the shell wall 2111 of the housing 211 in the third direction Z.

[0060] The concave portion 212a may be a “notch”-like structure that is recessed inward (refer to FIG. 6 ). For example, the concave portion 212a may be a concave rib. 8 and 9 , when the pole 212 is not riveted and flanging formed, the pole 212 may include a main body 201 and an extension 204. The extension 204 is provided on the main body 201, and a recess 212a may be pressed out of the outer side of the extension 204 by a rolling member (e.g., a roller). When the portion of the pole 212 passing through the through-hole 211a is riveted and flanging, the extension 204 is passed through the through-hole 211a. Since the recess 212a can remove part of the material of the pole 212, the resistance formed by the extrusion of the material is reduced when the pole 212 is riveted and flanging, and can play a guiding role when the pole 212 is riveted and flanging, reducing the difficulty of riveting and flanging the pole 212, making it easier for the extension 204 to bend under the stamping action of the punch to form the bent portion 203 and the connecting portion 202, thereby reducing the difficulty of forming and improving work efficiency. Moreover, since the difficulty of riveting and flanging the pole 212 is reduced, the pole 212 can be used to form the thicker bent portion 203 , and the thicker bent portion 203 can provide a greater clamping force, thereby improving the connection reliability between the pole 212 and the housing 211 .

[0061] In the above technical solution, the pole 212 is configured to include a main body 201, a connecting portion 202 and a bent portion 203, and a recess 212a is provided at the end of the bent portion 203 close to the connecting portion 202, and the recess 212a is located on the side of the end close to the shell 211. When the pole 212 is riveted and flanged to form the bent portion 203 and the connecting portion 202, the recess 212a can reduce the effect of material extrusion on the bending of the pole 212 to form the bent portion 203, and provide a guiding effect, which can reduce the difficulty of forming the bent portion 203 of the pole 212. At the same time, the recess 212a can form a relatively small bending angle between the bent portion 203 and the connecting portion 202, that is, the bent portion 203 can be close to parallel to the shell 211, which is beneficial to improve the clamping force of the bent portion 203 on the sealing component 213 in the through hole 211a, thereby improving the reliability of the battery cell 20.

[0062] In some embodiments of the present application, referring to FIG. 6 , the depth dimension of the recess 212 a is T, and the thickness dimension of the bent portion 203 is H, wherein 0<T / H≤0.7.

[0063] The depth dimension T of the concave portion 212a may refer to the dimension in the fourth direction W in FIG6 , and the thickness dimension H of the bent portion 203 may refer to the dimension in the third direction Z in FIG6 . T / H may be, but is not limited to, 0.1, 0.15, 0.18, 0.2, 0.23, 0.27, 0.3, 0.33, 0.36, 0.4, 0.44, 0.47, 0.5, 0.55, 0.58, 0.6, 0.62, 0.66, 0.68, 0.7, etc.

[0064] If the ratio of T / H is greater than 0.7, the depth of the recess 212a is relatively large, and more material is removed from the end of the bent portion 203, which can easily weaken the strength of the bent portion 203. After the pole 212 is riveted and flanged, it is easy to cause insufficient strength between the bent portion 203 and the connecting portion 202, and the probability of breakage is relatively high, thereby affecting the reliability of the pole 212.

[0065] In the above technical solution, by setting the ratio of the depth dimension of the recess 212a to the thickness dimension of the bent portion 203 within a range of less than or equal to 0.7, the recess 212a has an appropriate depth, which can effectively reduce the difficulty of riveting and flanging the pole 212, and ensure that the pole 212 has reliable strength after riveting and flanging, which is conducive to improving the reliability of the pole 212.

[0066] In some embodiments of the present application, referring to Figure 6, the shell 211 has a first wall 2111, the through hole 211a is provided on the first wall 2111, the main body 201 and the connecting portion 202 are surrounded to form a receiving groove 212b, which serves as a reference surface perpendicular to the first wall 2111, and the projection of the recess 212a on the reference surface is located within the projection of the receiving groove 212b on the reference surface.

[0067] Since the recess 212a is provided at the end of the bending portion 203 close to the connecting portion 202, the recess 212a will affect the strength of the position where the end of the bending portion 203 is located. Since the receiving groove 212b can be used to install the cover plate 214, by positioning the projection of the recess 212a on the reference surface within the projection of the receiving groove 212b on the reference surface, that is, in the first direction X, the recess 212a can face the side wall of the receiving groove 212b. After the cover plate 214 is fitted into the receiving groove 212b, it can play a role in enhancing the strength, thereby compensating for the strength weakened by the provision of the recess 212a on the bending portion 203, and improving the structural stability of the shell assembly 21.

[0068] In the above technical solution, by making a reference plane perpendicular to the first wall 2111, the projection of the recess 212a on the reference plane is located within the projection of the accommodating groove 212b on the reference plane. This structure enables the cover plate 214 to be installed in the accommodating groove 212b to compensate for the strength weakened by the setting of the recess 212a on the bending portion 203, which is beneficial to improving the strength of the position where the end of the bending portion 203 is located, thereby improving the structural stability of the shell assembly 21.

[0069] In some embodiments of the present application, referring to FIG. 5 , the housing assembly 21 further includes a seal 213 . The seal 213 is sleeved on the connecting portion 202 and partially located between the bending portion 203 and the housing 211 .

[0070] In the above technical solution, the bent portion 203 formed when the pole 212 is riveted and flanged can clamp the seal 213 on the shell 211, so that the seal 213 can seal the gap between the through hole 211a and the connecting portion 202, reducing the risk of leakage of the shell assembly 21.

[0071] In some embodiments of the present application, the sealing member 213 may be, but is not limited to, a rubber sealing ring, a polyurethane sealing ring, and the like.

[0072] In some embodiments of the present application, referring to FIG9 , the recess 212 a includes one of a polygon, an arc polygon, and an arc shape. The polygon may include, but is not limited to, a triangle, a quadrilateral, a pentagon, and the like. The recess 212 a may be an arc shape. The arc polygon may include, but is not limited to, an arc triangle, an arc quadrilateral, an arc pentagon, and the like.

[0073] In the above technical solution, by setting the recess 212a to include one of a polygon, an arc polygon and an arc, the recess 212a can have a variety of shapes, which can increase a variety of molding methods and reduce the difficulty of molding.

[0074] In a second aspect, referring to FIG. 5 , an embodiment of the present application provides a battery cell 20 including a housing assembly 21 .

[0075] In the battery cell 20, the terminal 212 can be provided with a seal 213 and an upper plastic part 215. The stamping part acts on the extension 204 of the terminal 212, so that the extension 204 is bent toward the side close to the edge of the through hole 211a at the recess 212a. The bent portion 203 formed by the extension 204 can clamp the seal 213 and the upper plastic part 215 on the shell 211, completing the assembly of the terminal 212, the seal 213 and the upper plastic part 215 on the shell 211.

[0076] In the above technical solution, the use of the above-mentioned shell assembly 21 can reduce the difficulty of forming the riveted flange of the pole 212, is conducive to the forming of the thicker bending portion 203, improves the connection reliability between the pole 212 and the shell 211, and improves the reliability of the battery cell 20.

[0077] In some embodiments of the present application, referring to Figures 5 and 7, the main body 201 and the connecting portion 202 enclose a receiving groove 212b, and the battery cell 20 also includes a cover plate 214, which is covered on the receiving groove 212b, and a welding portion 216 is formed between the other side of the end away from the shell 211 and the cover plate 214.

[0078] The receiving groove 212 b can reduce the weight of the pole 212 , thereby reducing the overall weight of the housing assembly 21 and improving the energy density of the battery cell 20 .

[0079] When the battery cell 20 needs to be connected to an external conductor or bus bar and other components, the cover plate 214 is set and the cover plate 214 is covered in the accommodating groove 212b, so that the cover plate 214 can be welded to the external conductor or bus bar and other components, so that the pole 212 can be electrically connected to the external conductor or bus bar. Since the pole 212 needs to be welded to the conductive part 221 of the electrode assembly 22, the cover plate 214 can separate the pole 212 and the conductive part 221. When the cover plate 214 is welded to the external conductor or bus bar and other components, the probability of a large temperature rise in the pole 212 can be reduced, thereby reducing the probability of the pole ear 212 and the conductive part 221 melting, and improving the connection reliability of the pole 212 and the conductive part 221.

[0080] In the above technical solution, the provision of the receiving groove 212b reduces the weight of the terminal 212, thereby improving the energy density of the battery cell 20. The provision of the cover plate 214 covering the receiving groove 212b allows the cover plate 214 to replace the terminal 212 in welding to external conductors, busbars, and other components, thereby reducing the probability of separation between the terminal 212 and the conductive portion 221 of the electrode assembly 22 and improving the reliability of the battery cell 20. Furthermore, the provision of the recess 212a on one side of the end of the bent portion 203 forms a welded portion 216 between the other side and the cover plate 214. Because the recess 212a improves the riveted flange quality of the terminal 212, the bent portion 203 is formed with relatively high quality. This improves the welded portion 216 when the end of the bent portion 203 is welded to the cover plate 214.

[0081] In some embodiments of the present application, referring to Figure 6, the shell 211 has a first wall 2111, the through hole 211a is provided on the first wall 2111, and serves as a reference plane perpendicular to the first wall 2111. The projection of the recess 212a on the reference plane is located within the projection of the cover plate 214 on the reference plane.

[0082] Referring to Figure 6, that is, in the first direction X, the recess 212a can face the cover plate 214, and the cover plate 214 can abut against the groove wall of the accommodating groove 212b corresponding to the recess 212a, thereby playing a better role in strengthening the strength, and better compensating for the strength weakened by the setting of the recess 212a on the bending portion 203, thereby further improving the structural stability of the shell assembly 21.

[0083] In the above technical solution, by making a reference plane perpendicular to the first wall 2111, the projection of the recess 212a on the reference plane is located within the projection of the cover 214 on the reference plane. The use of this structure can enable the cover 214 to strengthen the position corresponding to the recess 212a on the bending portion 203, further improve the strength of the position where the end of the bending portion 203 is located, thereby further improving the structural stability of the shell assembly 21.

[0084] In some embodiments of the present application, referring to Figure 7, the main body 201 is provided with a through hole 201a, and the through hole 201a is connected to the accommodating groove 212b; the battery cell 20 includes an electrode assembly 22, the electrode assembly 22 is arranged in the shell 211, and has a conductive part 221, the conductive part 221 is passed through the through hole 201a, and the part of the conductive part 221 located in the accommodating groove 212b is electrically connected to the main body 201 or the connecting part 202.

[0085] The conductive portion 221 may refer to a conductive component that connects the electrode assembly 22 and the electrode post 212. Specifically, the conductive portion 221 may be understood as a tab. The portion of the conductive portion 221 located within the receiving groove 212b may be electrically connected to the main body 201, or the portion of the conductive portion 221 located within the receiving groove 212b may be electrically connected to the connecting portion 202.

[0086] In the above technical solution, the accommodating groove 212b can accommodate part of the conductive part 221. The part of the conductive part 221 after passing through the through hole 201a can be arranged in the accommodating groove 212b, thereby reducing the volume occupied by the conductive part 221 in the shell 211, saving space in the shell 211, and being conducive to the arrangement of a larger-sized electrode assembly 22, thereby further improving the energy density of the battery cell 20.

[0087] In a third aspect, an embodiment of the present application provides a battery 100 , comprising the battery cell 20 as described above.

[0088] In the above technical solution, the use of the aforementioned battery cell 20 can improve the overall reliability of the battery 100 , thereby improving the performance of the battery 100 and extending its service life.

[0089] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising the battery cell 20 or the battery 100 as described above.

[0090] In the above technical solution, since the battery cell 20 and the battery 100 mentioned above have high reliability, it is beneficial to improve the reliability of the electrical device, improve the performance of the battery 100, and extend the service life.

[0091] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0092] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A housing assembly, wherein, Comprising: A housing, the housing being provided with a through hole; A terminal post, the terminal post comprising a main body portion, a connecting portion and a bent portion, the main body portion being located inside the housing, the connecting portion passing through the through hole and connecting the main body portion and the bent portion, the bent portion being located outside the housing, the bent portion having an end portion close to the connecting portion, and a concave portion being provided on one side of the end portion close to the housing.

2. The housing assembly according to claim 1, wherein, The depth dimension of the concave portion is T, and the thickness dimension of the bent portion is H, wherein 0 < T / H ≤ 0.

7.

3. The housing assembly according to claim 1, wherein, The housing has a first wall, the through hole is provided on the first wall, a reference plane perpendicular to the first wall is made, and the projection of the concave portion on the reference plane is located within the projection of the accommodating groove on the reference plane.

4. The housing assembly according to any one of claims 1 to 3, wherein, The housing assembly further includes a seal, the seal being sleeved on the connecting portion and partially located between the bent portion and the housing.

5. The housing assembly according to any one of claims 1 to 4, wherein, The concave portion includes one of a polygon, an arc polygon, and an arc.

6. A battery cell, wherein, Comprising: The housing assembly according to any one of claims 1 to 5.

7. The battery cell according to claim 6, wherein, The main body portion and the connecting portion enclose an accommodating groove, the battery cell further includes a cover plate, the cover plate covers the accommodating groove, and a welding portion is formed between the other side of the end portion away from the housing and the cover plate.

8. The battery cell according to claim 7, wherein, The housing has a first wall, the through hole is provided on the first wall, a reference plane perpendicular to the first wall is made, and the projection of the concave portion on the reference plane is located within the projection of the cover plate on the reference plane.

9. The battery cell according to claim 7, wherein, The main body portion is provided with a through hole, the through hole communicates with the accommodating groove, the battery cell includes an electrode assembly, the electrode assembly is provided inside the housing and has a conductive portion, the conductive portion passes through the through hole, and the portion of the conductive portion located in the accommodating groove is electrically connected to the main body portion or the connecting portion.

10. A battery, wherein, Comprising the battery cell according to any one of claims 6 to 7.

11. An electrical device, wherein, Comprising the battery cell according to any one of claims 6 to 7, or the battery according to claim 10.

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