Shell assembly, battery cell, battery and electric device

Abstract

The utility model discloses a shell assembly, a battery monomer, a battery and an electric device, and the shell assembly comprises a shell, a battery cell and a power utilization device, the shell is provided with a through hole; the pole comprises a main body part, a connecting part and a bending part, the main body part is located on the inner side of the shell, the connecting part penetrates through the via hole and is connected with the main body part and the bending part, the bending part is located on the outer side of the shell, the bending part is provided with an end part close to the connecting part, and a concave part is arranged on the side, close to the shell, of the end part. According to the utility model, the concave part is positioned on the end part, close to the connecting part, of the bending part, and the concave part is positioned on one side, close to the shell, of the end part, so that the concave part can reduce the influence of material extrusion on bending of the pole to form the bending part, provides a guiding function, and can reduce the forming difficulty of forming the bending part by the pole.

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, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and service life. However, when manufacturing battery cells, the poles are fixed to the shell by riveting and flanging. In this process, it is difficult to form the pole flanging, and the reliability of the pole after flanging is poor. Utility Model Content

[0003] The embodiments of the present application provide a shell assembly, a battery cell, a battery and an electrical device, which can effectively reduce the difficulty of forming the pole flanging and improve the reliability of the pole after flanging.

[0004] 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 a side of the end portion close to the shell.

[0005] In the above technical solution, the pole is arranged to include a main body, a connecting portion and a bending portion, 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 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 sealing member in the through hole, and improve the reliability of the battery cell.

[0006] In some embodiments of the present application, the depth dimension of the recess is T, and the thickness dimension of the bent portion is H, wherein 0<T / H≤0.7. In this technical solution, by setting the ratio of the depth dimension of the recess to the thickness dimension of the bent portion within a range of less than or equal to 0.7, the recess has an appropriate depth, which can effectively reduce the difficulty of riveting and flanging the pole, and make the pole have reliable strength after riveting and flanging, which is conducive to improving the reliability of the pole.

[0007] In some embodiments of the present application, the shell has a first wall, the through hole is arranged on the first wall, the main body and the connecting part enclose a receiving groove to serve as a reference plane perpendicular to the first wall, and the projection of the recess on the reference plane is located within the projection of the receiving groove on the reference plane.

[0008] In the above technical solution, by making a reference plane perpendicular to the first wall, the projection of the recess on the reference plane is located within the projection of the accommodating groove on the reference plane. 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.

[0009] In some embodiments of the present application, the housing assembly further includes a seal, which is sleeved on the connection portion and partially located between the bent portion and the housing. In this technical solution, the bent portion formed when the pole is riveted and flanging can clamp the seal on the housing, so that the seal can seal the gap between the via and the connection portion, reducing the risk of leakage of the housing assembly.

[0010] In some embodiments of the present application, the recess includes one of a polygon, an arc polygon and an arc. In this technical solution, by setting the recess to include one of a polygon, an arc polygon and an arc, the recess can have a variety of shapes, which can increase a variety of molding methods and reduce the difficulty of molding.

[0011] In the second aspect, the embodiment of the present application provides a battery cell, including: a shell assembly as described above. In this technical solution, the use of the above shell assembly can reduce the difficulty of forming the riveted flange of the pole, facilitate the forming of the thicker bending part, improve the connection reliability of the pole and the shell, and improve the reliability of the battery cell.

[0012] 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 disposed on the receiving groove, and a welding portion is formed between the end away from the other side of the shell and the cover plate.

[0013] In the above technical scheme, the weight of the pole can be reduced by providing a receiving groove, which is beneficial to improving the energy density of the battery cell. By providing a cover plate to cover the receiving groove, the cover plate can replace the pole to be welded with external conductors or busbars and other components, thereby 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 bending portion, and a welding portion is formed between the other side and the cover plate. Since the recess can improve the riveting flanging quality of the pole, the forming quality of the bending portion is relatively high. When the end of the bending portion is welded to the cover plate, it is beneficial to improve the welding forming quality of the welding portion.

[0014] In some embodiments of the present application, the shell has a first wall, the through hole is arranged on the first wall, and a reference plane is perpendicular to the first wall. The projection of the recess on the reference plane is located within the projection of the cover on the reference plane.

[0015] In the above technical solution, by making a reference plane perpendicular to the first wall, the projection of the recess on the reference plane is located within the projection of the cover on the reference plane. The use of this structure can enable the cover to strengthen the position corresponding to the recess on the bending portion, further improve the strength of the position where the end of the bending portion is located, thereby further improving the structural stability of the shell assembly.

[0016] 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.

[0017] 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 electrode assemblies, further improving the energy density of the battery cell.

[0018] In a third aspect, an embodiment of the present application provides a battery, including the battery cell as described above. In this technical solution, the battery cell as described above can improve the reliability of the battery as a whole, which is beneficial to improving the performance of the battery and extending its service life.

[0019] In a fourth aspect, the present application provides an electrical device, including 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, it is beneficial to improve the reliability of the electrical device, improve the performance of the battery, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0022] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0023] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0024] Figure 4 A top view of a battery cell provided for some embodiments of the present application;

[0025] Figure 5 for Figure 4 Schematic diagram of the section along line AA;

[0026] Figure 6 for Figure 5 A local enlarged schematic diagram of location I;

[0027] Figure 7 A partial internal schematic diagram of a battery cell provided in some embodiments of the present application;

[0028] Figure 8 A schematic diagram of a structure of a pole without riveted flange provided in some embodiments of the present application;

[0029] Fig. 9 Several structural schematic diagrams of the recessed portion on the pole provided in some embodiments of the present application.

[0030] 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 portion; 203, bending portion; 204, extending portion; 212a, recess; 212b, receiving groove; 213, sealing member; 214, cover plate; 215, upper plastic member; 216, welding portion; 22, electrode assembly; 221, conductive portion; 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction; W, fourth direction. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] 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.

[0036] 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.

[0037] The term "plurality" used in the present application refers to two or more (including two).

[0038] 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.

[0039] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0040] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed 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 a positive electrode ear. 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 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of 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. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0041] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0042] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0043] The inventor of the utility model has found that in a general power battery, the shell assembly of the battery cell includes a shell, a pole, an upper plastic and a sealing ring. The pole clamps the upper plastic and the sealing ring on the shell by riveting the flange, so that the sealing ring is compressed to ensure the sealing. In order to ensure that the riveted flange of the pole can clamp the upper plastic and the sealing ring, the thicker the flange of the pole is, the better the clamping effect can be. However, the thicker the flange is, the stronger the deformation resistance of the pole is, and the more difficult it is to form. At the same time, it will also affect the reliability of the pole flange, and then affect the reliability of the battery cell.

[0044] 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 has designed a shell assembly, including a shell and a pole, 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, 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.

[0045] 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 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, 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 enhance the clamping effect of the bending portion on the seal, and is beneficial to improving the reliability of the battery cell.

[0046] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electric devices such as vehicles, ships or aircraft. A power supply system having the battery monomers and batteries disclosed in the present application to form the electric device can be used, which is conducive to improving the application scope of the electric device composed of the battery monomers and batteries.

[0047] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0048] 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.

[0049] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0050] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0051] Please refer to Figure 2 , Figure 2The structural exploded diagram of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box 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.

[0052] In the battery 100, multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0053] Please refer to Figure 2 , Figure 2 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 direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the width direction of the box 10; or multiple rows of battery cells 20 are arranged along the width direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the length direction of the box 10.

[0054] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. Figure 2 In the figure, the battery cell 20 is in the shape of a rectangular parallelepiped.

[0055] According to some embodiments of the present application, referring to Figures 3 to 6 The embodiment of the present application provides 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.

[0056] It can be understood that the main body 201 is located inside the housing 211, and the bent portion 203 is located outside the housing 211. The main body 201 and the bent portion 203 cooperate with each other to fix the pole 212 on the housing 211, thereby reducing the probability of the pole 212 being separated from the housing 211. Figure 5 The main body 201 and the bending portion 203 may be located at two ends of the shell wall 2111 of the shell 211 in the third direction Z.

[0057] The recess 212a may be a "notch" structure that is recessed inward (see Figure 6 ), for example, the concave portion 212a may be a concave rib. Figure 8 and Fig. 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 arranged on the main body 201, and a recess 212a can be pressed out of the outer side of the extension 204 by a rolling member (such as a rolling cutter). 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 it can play a guiding role when the pole 212 is riveted and flanging, reducing the difficulty of riveting and flanging the pole 212, so that the extension 204 is easier to bend under the stamping action of the punch to form the bending portion 203 and the connecting portion 202, reducing the difficulty of forming and improving work efficiency. Furthermore, since the difficulty of riveting and flanging the pole 212 is reduced, the pole 212 can be used to form the thicker bending portion 203 , and the thicker bending portion 203 can provide a greater clamping force, thereby improving the connection reliability between the pole 212 and the housing 211 .

[0058] In the above technical solution, the pole 212 is configured to include a main body 201, a connecting portion 202 and a bending portion 203, and a recess 212a is provided at the end of the bending 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 bending portion 203 and the connecting portion 202, the recess 212a can reduce the influence of material extrusion on the bending of the pole 212 to form the bending portion 203, and provide a guiding effect, which can reduce the difficulty of forming the bending portion 203 of the pole 212. At the same time, the recess 212a can form a relatively small bending angle between the bending portion 203 and the connecting portion 202, that is, the bending portion 203 can be close to parallel to the shell 211, which is beneficial to improve the clamping force of the bending portion 203 on the sealing member 213 in the through hole 211a, thereby improving the reliability of the battery cell 20.

[0059] In some embodiments of the present application, reference Figure 6 The depth dimension of the concave portion 212a is T, and the thickness dimension of the bent portion 203 is H, wherein 0<T / H≤0.7.

[0060] The depth dimension T of the recess 212a may be Figure 6 The dimension in the fourth direction W, the thickness dimension H of the bending portion 203 may refer to Figure 6 The dimension in the third direction Z. T / H can 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.

[0061] 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 is easy to weaken the strength of the bent portion 203. After the pole 212 is riveted and flanging, 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.

[0062] In the above technical solution, by setting the ratio of the depth dimension of the recess 212a and the thickness dimension of the bending portion 203 within a range 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 make the pole 212 have reliable strength after riveting and flanging, which is beneficial to improving the reliability of the pole 212.

[0063] In some embodiments of the present application, reference Figure 6The shell 211 has a first wall 2111, the through hole 211a is arranged on the first wall 2111, the main body 201 and the connecting part 202 are surrounded to form a receiving groove 212b, which serves as a reference plane perpendicular to the first wall 2111, and the projection of the recessed part 212a on the reference plane is located within the projection of the receiving groove 212b on the reference plane.

[0064] 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 locating the projection of the recess 212a on the reference plane within the projection of the receiving groove 212b on the reference plane, that is, in the first direction X, the recess 212a can be directly opposite to the side wall of the receiving groove 212b. After the cover plate 214 is fitted in the receiving groove 212b, it can play a role in enhancing the strength, compensating for the strength weakened by the setting of the recess 212a on the bending portion 203, and can improve the structural stability of the shell assembly 21.

[0065] 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 in 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.

[0066] In some embodiments of the present application, reference Figure 5 The shell assembly 21 further includes a sealing member 213 , which is sleeved on the connecting portion 202 and partially located between the bending portion 203 and the shell 211 .

[0067] 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.

[0068] In some embodiments of the present application, the seal 213 may be, but is not limited to, a rubber seal ring, a polyurethane seal ring, and the like.

[0069] In some embodiments of the present application, reference Fig. 9 The concave portion 212a includes one of a polygon, an arc polygon and an arc. The polygon may include but is not limited to a triangle, a quadrilateral, a pentagon, etc. The concave portion 212a may be an arc. The arc polygon may include but is not limited to an arc triangle, an arc quadrilateral, an arc pentagon, etc.

[0070] 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.

[0071] Second, reference Figure 5 , an embodiment of the present application provides a battery cell 20 including a shell assembly 21 .

[0072] In the battery cell 20, the pole 212 can be sleeved with a seal 213 and an upper plastic part 215. The stamping part acts on the protruding portion 204 of the pole 212, so that the protruding portion 204 is bent toward the side close to the edge of the via 211a at the recess 212a. The bent portion 203 formed by the protruding portion 204 can clamp the seal 213 and the upper plastic part 215 on the shell 211, thereby completing the assembly of the pole 212, the seal 213 and the upper plastic part 215 on the shell 211.

[0073] 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, which 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.

[0074] In some embodiments of the present application, reference Figure 5 and Figure 7 The main body 201 and the connecting portion 202 enclose a receiving groove 212 b. The battery cell 20 further includes a cover plate 214 , which covers the receiving groove 212 b , and a welding portion 216 is formed between the cover plate 214 and the other side of the end away from the shell 211 .

[0075] 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 .

[0076] 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 fusing, and improving the connection reliability between the pole 212 and the conductive part 221.

[0077] In the above technical solution, the weight of the pole 212 can be reduced by providing the receiving groove 212b, which is beneficial to improving the energy density of the battery cell 20. By providing the cover plate 214 to cover the receiving groove 212b, the cover plate 214 can replace the pole 212 to be welded with the external conductor or busbar and other components, thereby reducing the probability of the pole 212 and the conductive part 221 of the electrode assembly 22 being separated, which is beneficial to improving the reliability of the battery cell 20. In addition, by providing a recessed portion 212a on one side of the end of the bending portion 203, a welding portion 216 is formed between the other side and the cover plate 214. Since the recessed portion 212a can improve the riveting and flanging quality of the pole 212, the forming quality of the bending portion 203 is relatively high. When the end of the bending portion 203 is welded with the cover plate 214, it is beneficial to improve the welding forming quality of the welding portion 216.

[0078] In some embodiments of the present application, reference Figure 6 The shell 211 has a first wall 2111, and the through hole 211a is arranged on the first wall 2111, which serves as a reference plane perpendicular to the first wall 2111, and the projection of the recess 212a on the reference plane is located within the projection of the cover plate 214 on the reference plane.

[0079] refer to Figure 6 That is to say, 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 enhancing strength and compensating for the strength weakened by setting the recess 212a on the bending portion 203, thereby further improving the structural stability of the shell assembly 21.

[0080] 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.

[0081] In some embodiments of the present application, reference Figure 7 The main body 201 is provided with a through hole 201a, and the through hole 201a is connected to the receiving 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 receiving groove 212b is electrically connected to the main body 201 or the connecting part 202.

[0082] The conductive part 221 may refer to a conductive component connecting the electrode assembly 22 and the pole 212. Specifically, the conductive part 221 may be understood as a pole ear. The portion of the conductive part 221 located in the receiving groove 212b may be electrically connected to the main body 201, or the portion of the conductive part 221 located in the receiving groove 212b may be electrically connected to the connecting part 202.

[0083] 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 arranging a larger-sized electrode assembly 22, thereby further improving the energy density of the battery cell 20.

[0084] In a third aspect, an embodiment of the present application provides a battery 100, comprising the battery cell 20 as described above.

[0085] In the above technical solution, the use of the aforementioned battery cell 20 can improve the overall reliability of the battery 100, which is beneficial to improving the performance of the battery 100 and extending its service life.

[0086] In a fourth aspect, an embodiment of the present application provides an electrical device, including a battery cell 20 or a battery 100 as described above.

[0087] 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.

[0088] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0089] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A housing assembly, characterized in that: include: A housing, wherein the housing is provided with a through hole; The pole comprises a main body, a connecting portion and a bending portion, wherein the main body is located on the inner side of the shell, the connecting portion is passed through the through hole and connects the main body and the bending portion, the bending portion is located on the outer side of the shell, the bending portion has an end portion close to the connecting portion, and a recess is provided on one side of the end portion close to the shell.

2. The housing assembly according to claim 1, characterized in that: 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, characterized in that: The shell has a first wall, the through hole is arranged on the first wall, the main body and the connecting part 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.

4. The housing assembly according to any one of claims 1 to 3, characterized in that: The shell assembly also includes a sealing member, which is sleeved on the connecting portion and partially located between the bending portion and the shell.

5. The housing assembly according to any one of claims 1 to 3, characterized in that: The concave portion includes one of a polygon, an arc polygon and an arc shape.

6. A battery cell, characterized in that: include: A housing assembly as claimed in any one of claims 1 to 5.

7. The battery cell according to claim 6, characterized in that: The main body and the connecting portion are combined to form a receiving groove. The battery cell further includes a cover plate, which is disposed on the receiving groove. A welding portion is formed between the other side of the end away from the shell and the cover plate.

8. The battery cell according to claim 7, characterized in that: The housing has a first wall, the through hole is arranged on the first wall, and serves as a reference plane perpendicular to the first wall. The projection of the recess 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, characterized in that: The main body is provided with a through hole, and the through hole is connected to the receiving groove. The battery cell includes an electrode assembly, and the electrode assembly is arranged in the shell and has a conductive part. The conductive part passes through the through hole, and the conductive part located in the receiving groove is electrically connected to the main body or the connecting part.

10. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 6 to 7.

11. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 6 to 7, or the battery according to claim 10.

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