Battery cell, battery device, and electric apparatus
The shell design, which incorporates bending connections and butt welding, solves the problems of numerous welding operations and low yield rates in battery cell production, thereby improving production efficiency and energy density, as well as enhancing appearance and assembly stability.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-09-22
- Publication Date
- 2026-07-09
Smart Images
Figure CN2025123061_09072026_PF_FP_ABST
Abstract
Description
Battery cells, battery devices and electrical equipment
[0001] Cross-references to related applications
[0002] This application claims priority to Chinese Patent Application No. 202520006195.4, filed on January 2, 2025, entitled “Battery Cell, Battery Device and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application belongs to the field of battery technology, and in particular relates to a battery cell, a battery device, and an electrical device. Background Technology
[0004] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.
[0005] The development of battery technology needs to consider many factors, such as battery energy density, reliability, cycle life, as well as battery production efficiency and yield. Summary of the Invention
[0006] This application provides a battery cell, a battery device, and an electrical equipment, which helps to improve the production yield and efficiency of battery cells.
[0007] According to a first aspect of this application, a battery cell is provided, comprising an electrode assembly and a housing. The housing has an opening on one side along a first direction. The housing includes a first wall portion disposed opposite to the opening, two second walls portions disposed opposite to each other along a second direction, and two third walls portions disposed opposite to each other along a third direction. The first, second, and third directions intersect each other. The first, second, and third walls portions enclose a receiving cavity, and the electrode assembly is disposed within the receiving cavity. At least one of the first wall portion and the two second walls portions is bent and connected to the third wall portion. The first wall portion includes two first sub-wall portions arranged along the third direction, and the two first sub-wall portions are welded together. Each second wall portion includes two second sub-wall portions arranged along the third direction, and the two second sub-wall portions of the same second wall portion are welded together. At least one of the first wall portion and the two second walls portions does not need to be welded to the third wall portion, which helps to reduce the number of welding operations and improve production efficiency. Furthermore, the fillet welds between at least two mutually perpendicular wall sections can be replaced with butt welds between two first sub-wall sections and between two second sub-wall sections, which helps to reduce the number of fillet welds on the casing, improve the welding yield, and thus improve the production yield of battery cells.
[0008] In some embodiments, the first sub-wall portion has a first outer surface facing away from the receiving cavity; two first sub-wall portions are welded to form a first weld portion, which does not extend beyond the first outer surface along the direction from the opening to the first wall portion. The fact that the first weld portion does not protrude outward from the first outer surface not only improves the appearance of the housing and enhances the surface flatness of the first wall portion, but also reduces the space occupied by the first wall portion in the first direction, which is beneficial to improving energy density.
[0009] In some embodiments, the first outer surfaces of the two first sub-wall portions are flush along the first direction. On the one hand, this can further improve the surface flatness of the first wall portions, facilitating the assembly of battery cells and improving the installation stability of battery cells; on the other hand, it can also reduce the difficulty of the butt welding operation between the two first sub-wall portions, which is beneficial to improving the welding yield.
[0010] In some embodiments, along a third direction, the distance between the first weld portion and the two third wall portions is the same. The first weld portion is not too close to either third wall portion, which helps to reduce the welding difficulty between the two first sub-wall portions and reduce the impact of the welding operation on the third wall portion.
[0011] In some embodiments, the second sub-wall portion has a second outer surface facing away from the receiving cavity; two second sub-wall portions of the second wall portion are welded to form a second weld portion, and in the direction away from the receiving cavity, the second weld portion does not extend beyond the second outer surface of the two second sub-wall portions to which it is connected. The fact that the second weld portion does not protrude outward from the second outer surface not only improves the appearance of the housing and enhances the surface flatness of the second wall portion, but also reduces the space occupied by the second wall portion in the second direction, which is beneficial to improving energy density.
[0012] In some embodiments, along the second direction, the second outer surfaces of the two second sub-walls of the same second wall portion are flush. On the one hand, this can further improve the surface flatness of the second wall portion, facilitating the assembly and stacking of battery cells; on the other hand, it can also reduce the difficulty of the butt welding operation between the two second sub-wall portions, which is beneficial to improving the welding yield.
[0013] In some embodiments, the distance between the second weld portion and the two third wall portions is the same along a third direction. The second weld portion is not too close to either third wall portion, which helps to reduce the welding difficulty between the two second sub-wall portions and minimizes the impact of the welding operation on the third wall portions.
[0014] In some embodiments, two first sub-wall portions are directly connected to two third wall portions, and each third wall portion is directly connected at both ends along the second direction to one of the second sub-wall portions of the two second wall portions. One third wall portion, the first sub-wall portion directly connected to that third wall portion, and the second sub-wall portion directly connected to that third wall portion form a first housing portion, which is an integral structure. Another third wall portion, the first sub-wall portion directly connected to that other third wall portion, and the second sub-wall portion directly connected to that other third wall portion form a second housing portion, which is also an integral structure. The fact that both the first and second housing portions are integral structures helps reduce the number of welds required for both the first and second housing portions, thereby improving the production efficiency and yield of the housing.
[0015] In some embodiments, the first housing portion and the second housing portion are symmetrically arranged. The first housing portion and the second housing portion have the same structure, which helps to improve the interchangeability of housing parts, thereby improving the production efficiency of battery cells.
[0016] In some embodiments, the first housing portion is formed by bending a sheet metal; adjacent third wall portion, first sub-wall portion, and two second sub-wall portions of the first housing portion are bent and connected or welded together. The bending connection of at least two adjacent walls of the first housing portion eliminates the need for welding or other connection operations, which improves production yield. The uniform thickness among the walls of the first housing portion contributes to improved structural stability.
[0017] In some embodiments, the dimension of the housing along the second direction is larger than the dimension of the housing along the third direction; the two ends of the first sub-wall portion of the first housing portion along the second direction are respectively welded to the two second sub-wall portions of the first housing portion. The relatively short dimension of the housing along the third direction can shorten the length of the fillet weld required between the first and second sub-wall portions of the first housing portion, which is beneficial to further improve the welding yield and welding efficiency.
[0018] In some embodiments, the second housing portion is formed by bending a sheet metal; the third wall portion, the first sub-wall portion, and two adjacent second sub-wall portions of the second housing portion are bent and connected or welded together. The bending connection of at least two adjacent walls of the second housing portion eliminates the need for welding or other connection operations, which improves production yield. The uniform thickness among the walls of the second housing portion improves structural stability. When the first and second housing portions are symmetrical, they can be formed by bending sheet metal of the same shape. The sheet metal required to form the first and second housing portions can be cut in a single cutting process without changing the cutting path, improving sheet metal interchangeability and cutting efficiency, thereby increasing the production efficiency of the battery cell.
[0019] In some embodiments, the dimension of the housing along the second direction is larger than the dimension of the housing along the third direction; the two ends of the first sub-wall portion of the second housing portion along the second direction are respectively welded to the two second sub-wall portions of the second housing portion. The relatively short dimension of the housing along the third direction can shorten the length of the fillet weld required between the first and second sub-wall portions of the second housing portion, which is beneficial to further improve the welding yield and welding efficiency.
[0020] In some embodiments, the base metals of the first wall portion, the second wall portion, and the third wall portion are all steel. Steel has good mechanical strength, which can improve the overall structural strength of the casing. At the same time, it can also appropriately reduce the thickness of the casing, which is beneficial to improving the energy density of the battery cell. Steel has good corrosion resistance, which helps to reduce the risk of the casing being corroded by the electrolyte and improves the reliability of the battery cell.
[0021] In some embodiments, the battery cell includes an end cap that is attached to the housing and covers the opening.
[0022] According to a second aspect of this application, embodiments of this application also provide a battery device comprising a plurality of battery cells provided according to any embodiment of the first aspect of this application.
[0023] According to a third aspect of this application, embodiments of this application also provide an electrical device that includes a battery device provided according to any embodiment of a second aspect of this application, the battery device being used to provide electrical energy. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application.
[0026] Figure 2 is an exploded structural diagram of a battery device provided in some embodiments of this application.
[0027] Figure 3 is an exploded structural diagram of a battery cell provided in some embodiments of this application.
[0028] Figures 4 and 5 are schematic diagrams of the battery cell housing in different orientations according to some embodiments of this application.
[0029] Figure 6 is a cross-sectional schematic diagram of the first wall portion of a battery cell provided in some embodiments of this application.
[0030] Figure 7 is a cross-sectional schematic diagram of the second wall portion of a battery cell provided in some embodiments of this application.
[0031] Figure 8 is an exploded structural diagram of the shell shown in Figures 4 and 5.
[0032] Figure 9 is a structural schematic diagram of the first or second shell portion of the shell shown in Figure 8 in its unfolded state.
[0033] Figures 10 and 11 are schematic diagrams of the battery cell housing in different orientations according to other embodiments of this application.
[0034] Figure 12 is a schematic diagram of the exploded structure of the shell shown in Figures 10 and 11.
[0035] Figure 13 is a schematic diagram of the structure in which the first or second shell portion of the shell shown in Figures 10 to 12 is connected in the first manner.
[0036] Figure 14 is a schematic diagram of the first or second shell section shown in Figure 13 in its unfolded state.
[0037] Figure 15 is a structural schematic diagram of the first or second shell portion of the shell shown in Figures 10 to 12 connected in a second manner.
[0038] Figure 16 is a schematic diagram of the first or second shell section shown in Figure 15 in its unfolded state.
[0039] Figure 17 is a structural schematic diagram of the first or second shell portion of the shell shown in Figures 10 to 12 connected by a third method.
[0040] Figure 18 is a structural schematic diagram of the first or second shell section shown in Figure 17 in its unfolded state.
[0041] In the attached diagram: Vehicle 1, Battery device 2, Controller 3, Motor 4, Housing 5, Battery cell 6; Electrode assembly 10, Housing 20, Housing 21, First wall 211, First sub-wall 2111, First outer surface 2111a, Second wall 212, Second sub-wall 2121, Second outer surface 2121a, Third wall 213, Opening 21a, Receiving cavity 21b, First housing portion 21c, Second housing portion 21d, End cap 22, Electrode terminal 30, First housing portion 5a, Second housing portion 5b, Receiving space 5c, First welded portion W1, Second welded portion W2, First direction X, Second direction Y, Third direction Z. Detailed Implementation
[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0044] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0047] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0048] In this application, "multiple" means two or more (including two).
[0049] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.
[0050] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.
[0051] A battery cell typically includes an electrode assembly and a casing. The electrode assembly, located within the casing, includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. Exemplarily, the electrode assembly also includes a separator, which prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.
[0052] The housing is used to encapsulate electrode components and electrolytes. The housing can be made of steel, aluminum, composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.
[0053] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.
[0054] As an example, the battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.
[0055] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.
[0056] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. A battery device generally includes a housing for encapsulating one or more battery cell assemblies. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.
[0057] As an example, a battery cell assembly can be a battery module, which consists of multiple battery cells arranged and fixed together to form a single module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by securing the battery module within a casing.
[0058] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.
[0059] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.
[0060] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.
[0061] In the production process of battery casings, sheet metal is typically first cut into multiple plates of the required size using processes such as shearing and stamping. These plates are then cleaned and welded together. This method requires numerous welding operations, and the welding between adjacent plates is mostly fillet welding, resulting in a low weld quality rate.
[0062] In view of this, the present application provides a technical solution that connects the first wall portion and at least one of the two second walls portion of the housing to the third wall portion by bending. This eliminates the need for welding the first wall portion and at least one of the two second walls portion to the third wall portion, thereby reducing the number of welding operations and improving production efficiency. Furthermore, welding the two first sub-wall portions of the first wall portion and the two second sub-wall portions of the second wall portion can replace the fillet weld between at least two mutually perpendicular walls with a butt weld between the two first sub-wall portions and a butt weld between the two flat second sub-wall portions. This reduces the number of fillet welds between two mutually perpendicular walls of the housing, improves the welding yield, and thus improves the production yield of the battery cell.
[0063] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.
[0064] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0065] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.
[0066] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. Referring to Figure 1, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.
[0067] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
[0068] Figure 2 is an exploded structural diagram of a battery device provided in some embodiments of this application. Referring to Figure 2, the battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a housing space 5c for the battery cell 6, and the housing 5 can adopt various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, jointly defining the housing space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b jointly define the housing space; alternatively, the first housing portion 5a and the second housing portion 5b may both be hollow structures with one open side, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.
[0069] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.
[0070] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.
[0071] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.
[0072] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.
[0073] Figure 3 is an exploded structural diagram of a battery cell provided in some embodiments of this application. Referring to Figure 3, the battery cell 6 includes an electrode assembly 10 and a housing 20, with the electrode assembly 10 housed within the housing 20.
[0074] The outer casing 20 is used to encapsulate the electrode assembly 10 and electrolyte components. The outer casing 20 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.
[0075] In some embodiments, the housing 20 is a hollow structure, with an internal space for accommodating the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a cuboid structure, a cuboid housing can be selected.
[0076] The outer casing 20 can be made of various materials, such as metal. Optionally, the outer casing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the outer casing 20 can be a steel casing, an aluminum casing, a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc.
[0077] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening and the end cap 22 for closing the opening.
[0078] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.
[0079] The housing 21 and the end cap 22 can be separate components. For example, an opening can be provided on the housing 21, and the end cap 22 can be used to close the opening to form an internal cavity for the battery cell 6.
[0080] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.
[0081] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.
[0082] In some embodiments, the battery cell 6 further includes an electrode terminal 30, which can be electrically connected to the electrode assembly 10 for outputting or inputting electrical energy into the battery cell 6.
[0083] In some embodiments, the electrode terminals 30 are disposed on one of the walls of the housing 20. This wall may be one of the walls of the housing 21 or an end cap 22. Exemplarily, the housing 21 may be an open structure at one end, and the battery cell 6 includes an end cap 22 and two electrode terminals 30. Both electrode terminals 30 are mounted on the end cap 22, and the two electrode terminals 30 are electrically connected to the positive electrode and the negative electrode, respectively.
[0084] In the battery cell 6, the electrode assembly 10 housed in the housing 21 can be one or more.
[0085] Figures 4 and 5 are schematic diagrams of the battery cell housing in different orientations according to some embodiments of this application. Referring to Figures 3 to 5, the battery cell 6 provided in this embodiment includes an electrode assembly 10 and a housing 21. The housing 21 has an opening 21a on one side along a first direction X. The housing 21 includes a first wall portion 211 disposed opposite to the opening 21a, two second wall portions 212 disposed opposite to each other along a second direction Y, and two third wall portions 213 disposed opposite to each other along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. The first wall portion 211, the second wall portion 212, and the third wall portion 213 enclose a receiving cavity 21b, and the electrode assembly 10 is disposed in the receiving cavity 21b. At least one of the first wall portion 211 and the two second wall portions 212 is bent and connected to the third wall portion 213. The first wall portion 211 includes two first sub-wall portions 2111 arranged along the third direction Z, and the two first sub-wall portions 2111 are welded together. Each second wall portion 212 includes two second sub-wall portions 2121 arranged along the third direction Z, and the two second sub-wall portions 2121 of the same second wall portion 212 are welded together.
[0086] The first wall portion 211 is disposed opposite to the opening 21a along the first direction X, and there is one first wall portion 211.
[0087] The first wall portion 211, the second wall portion 212, and the third wall portion 213 enclose and form a cylindrical receiving cavity 21b, which is open to the outside through an opening 21a.
[0088] The first wall portion 211 is connected to two second wall portions 212 at its two opposite edges along the second direction Y, and to two third wall portions 213 at its two opposite edges along the third direction Z.
[0089] Optionally, the shell 21 may be rectangular. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first wall portion 211, the second wall portion 212, and the third wall portion 213 are perpendicular to each other.
[0090] In the embodiments of this application, a bending connection refers to a connection formed by bending a single integral piece. For example, a bending connection between the first wall portion 211 and at least one of the two second wall portions 212 and the third wall portion 213 means that the first wall portion 211 and at least one of the two second wall portions 212 and the third wall portion 213 are formed by bending a single sheet material, without the need for welding or other connection operations.
[0091] In some examples, the first wall portion 211 is bent to the third wall portion 213, and the two second wall portions 212 may be connected to the third wall portion 213 by welding or other suitable means.
[0092] In other examples, a second wall portion 212 is bent to the third wall portion 213, and another second wall portion 212 and the first wall portion 211 are both connected to the third wall portion 213 by welding or other suitable means.
[0093] In some other examples, both second wall portions 212 are bent to the third wall portion 213, and the first wall portion 211 is connected to the third wall portion 213 by welding or other suitable means.
[0094] In some other examples, the first wall portion 211 and the two second wall portions 212 are bent and connected to the third wall portion 213.
[0095] The two first sub-wall portions 2111 have the same dimensions along the second direction Y, and the two first sub-wall portions 2111 can have the same or different dimensions along the third direction Z.
[0096] The two second sub-wall portions 2121 of the second wall portion 212 have the same dimensions along the first direction X, and the two second sub-wall portions 2121 of the second wall portion 212 can have the same or different dimensions along the third direction Z.
[0097] The first sub-wall portion 2111 has a uniform size along the third direction Z, and the second sub-wall portions 2121 of the two second wall portions 212 are arranged opposite each other along the second direction Y.
[0098] The first sub-wall portion 2111 can be perpendicular to the first direction X, and the second sub-wall portion 2121 can be perpendicular to the second direction Y.
[0099] Two first sub-wall portions 2111 can be arranged along the third direction Z, and the welding between the two first sub-wall portions 2111 is a butt weld. Two second sub-wall portions 2121 of the same second wall portion 212 are arranged along the third direction Z, and the welding between the two second sub-wall portions 2121 of the same second wall portion 212 is a butt weld.
[0100] Any two of the first wall portion 211, the second wall portion 212, and the third wall portion 213 form a certain angle. Any two of the first wall portion 211, the second wall portion 212, and the third wall portion 213 need to be welded by fillet welding. Compared with butt welding, fillet welding is more difficult to control and is prone to defects such as cracks and weak welding. The welding efficiency of fillet welding is relatively low.
[0101] In this embodiment, at least one of the first wall portion 211 and the two second wall portions 212 of the housing 21 is bent and connected to the third wall portion 213. Since at least one of the first wall portion 211 and the two second wall portions 212 does not need to be welded to the third wall portion 213, this reduces the number of welding operations and improves production efficiency. Furthermore, the two first sub-wall portions 2111 of the first wall portion 211 are butt-welded, and the two second sub-wall portions 2121 of the same second wall portion 212 are butt-welded. This replaces the fillet welds between at least two mutually perpendicular walls with butt-welding between the two first sub-wall portions 2111 and the two second sub-wall portions, which reduces the number of fillet welds on the housing, improves the welding yield, and thus improves the production yield of the battery cell 6.
[0102] Figure 6 is a cross-sectional schematic diagram of the first wall portion of a battery cell provided in some embodiments of this application. In some embodiments, referring to Figures 4 to 6, the first sub-wall portion 2111 has a first outer surface 2111a facing away from the receiving cavity 21b. Two first sub-wall portions 2111 are welded to form a first weld portion W1, which does not extend beyond the first outer surface 2111a in the direction from the opening 21a toward the first wall portion 211.
[0103] The two first sub-wall portions 2111 are connected by a first weld portion W1. The first weld portion W1 is a strip-shaped weld portion extending along the second direction Y.
[0104] The thicknesses of the two first sub-wall portions 2111 can be the same or different.
[0105] Along the direction from the opening 21a toward the first wall portion 211, the first welded portion W1 does not extend beyond the first outer surface 2111a of either of the first sub-wall portions 2111. Along the first direction X, the first outer surfaces 2111a of the two first sub-wall portions 2111 can be flush or staggered.
[0106] The surface of the first welded portion W1 facing away from the receiving cavity 21b can be either flat or curved. Along the direction from the opening 21a toward the first wall portion 211, the first outer surface 2111a can extend beyond the farthest position of the surface of the first welded portion W1 facing away from the receiving cavity 21b, or be flush with the farthest position of the surface of the first welded portion W1 facing away from the receiving cavity 21b.
[0107] Before the two first sub-wall portions 2111 are welded, a first welding recess may be formed between the two first sub-wall portions 2111, which is recessed into the first outer surface 2111a of the two first sub-wall portions 2111. At least a portion of the first weld portion W1 may be formed in the first welding recess. The first welding recess may be, for example, V-shaped, inverted trapezoidal, etc.
[0108] The first welded part W1 does not protrude outward from the first outer surface 2111a, which not only improves the appearance of the shell 21 and enhances the surface flatness of the first wall part 211, but also reduces the space occupied by the first wall part 211 in the first direction X, which is beneficial to improving energy density.
[0109] In some embodiments, along the first direction X, the first outer surfaces 2111a of the two first sub-wall portions 2111 are flush. In other words, the first outer surfaces 2111a of the two first sub-wall portions 2111 are both planar, and the first outer surfaces 2111a of the two first sub-wall portions 2111 are in the same plane. On the one hand, this can further improve the surface flatness of the first wall portion 211, which facilitates the assembly of the battery cell 6 and helps to improve the installation stability of the battery cell 6; on the other hand, it can also reduce the difficulty of the butt welding operation between the two first sub-wall portions 2111, which helps to improve the welding yield.
[0110] In some embodiments, along the third direction Z, the distance between the first welded portion W1 and the two third wall portions 213 is the same.
[0111] Optionally, the dimensions of the two first sub-wall portions 2111 along the third direction Z can be the same.
[0112] The first welded part W1 is located in the middle of the first wall part 211 along the third direction Z. The first welded part W1 will not be too close to any third wall part 213, which helps to reduce the welding difficulty between the two first sub-wall parts 2111 and reduce the impact of welding operations on the third wall part 213.
[0113] Figure 7 is a cross-sectional schematic diagram of the second wall portion of a battery cell provided in some embodiments of this application. In some embodiments, referring to Figures 4, 5, and 7, the second sub-wall portion 2121 has a second outer surface 2121a facing away from the receiving cavity 21b. Two second sub-wall portions 2121 of the second wall portion 212 are welded to form a second weld portion W2, and along the direction away from the receiving cavity 21b, the second weld portion W2 does not extend beyond the second outer surface 2121a of the two second sub-wall portions 2121 connected to it.
[0114] Two second sub-wall portions 2121 of the same second wall portion 212 are connected by a second weld portion W2. The second weld portion W2 is a strip-shaped weld portion extending along the first direction X.
[0115] The thicknesses of the two second sub-wall portions 2121 can be the same or different.
[0116] Along the direction away from the receiving cavity 21b, the second welded portion W2 does not extend beyond the second outer surface 2121a of either of the second sub-wall portions 2121. Along the second direction Y, the second outer surfaces 2121a of the two second sub-wall portions 2121 can be flush or staggered.
[0117] The surface of the second welded part W2 facing away from the receiving cavity 21b can be either flat or curved. Along the direction away from the receiving cavity 21b, the second outer surface 2121a can extend beyond the farthest position of the surface of the second welded part W2 facing away from the receiving cavity 21b, or be flush with the farthest position of the surface of the second welded part W2 facing away from the receiving cavity 21b.
[0118] Before the two second sub-wall portions 2121 are welded, a second welding recess may be formed between the two second sub-wall portions 2121, which is recessed into the second outer surface 2121a of the two second sub-wall portions 2121. At least a portion of the second weld portion W2 may be formed in the second welding recess. The second welding recess may be, for example, V-shaped, inverted trapezoidal, etc.
[0119] The second welded part W2 does not protrude outward from the second outer surface 2121a, which not only improves the appearance of the shell 21 and enhances the surface flatness of the second wall part 212, but also reduces the space occupied by the second wall part 212 in the second direction Y, which is beneficial to improving energy density.
[0120] In some embodiments, along the second direction Y, the second outer surfaces 2121a of the two second sub-wall portions 2121 of the same second wall portion 212 are flush. In other words, the second outer surfaces 2121a of the two second sub-wall portions 2121 are both planar, and the second outer surfaces 2121a of the two second sub-wall portions 2121 of the same second wall portion 212 are in the same plane. On the one hand, this can further improve the surface flatness of the second wall portion 212, facilitating the assembly and stacking of the battery cell 6; on the other hand, it can also reduce the difficulty of the butt welding operation between the two second sub-wall portions 2121, which is beneficial to improving the welding yield.
[0121] In some embodiments, along the third direction Z, the distance between the second welded portion W2 and the two third wall portions 213 is the same.
[0122] Optionally, the dimensions of the two second sub-walls 2121 of the same second wall portion 212 along the third direction Z can be the same.
[0123] The second welded part W2 is located in the middle of the second wall part 212 along the third direction Z. The second welded part W2 will not be too close to any third wall part 213, which helps to reduce the welding difficulty between the two second sub-wall parts 2121 and reduce the impact of welding operations on the third wall part 213.
[0124] Figure 8 is an exploded structural diagram of the housing shown in Figures 4 and 5. Figure 9 is a structural diagram of the first or second housing portion of the housing shown in Figure 8 in an unfolded state. Figures 10 and 11 are structural diagrams of the housing of a battery cell provided in other embodiments of this application in different orientations. Figure 12 is an exploded structural diagram of the housing shown in Figures 10 and 11.
[0125] In some embodiments, referring to Figures 4 to 12, two first sub-wall portions 2111 are directly connected to two third wall portions 213, and each third wall portion 213 is directly connected at both ends along the second direction Y to one of the second sub-wall portions 2121 of the two second wall portions 212. One third wall portion 213, the first sub-wall portion 2111 directly connected to it, and the second sub-wall portion 2121 directly connected to it form a first housing portion 21c, which is an integral structure. Another third wall portion 213, the first sub-wall portion 2111 directly connected to it, and the second sub-wall portion 2121 directly connected to it form a second housing portion 21d, which is also an integral structure.
[0126] In some examples, the first sub-wall portion 2111 and the third wall portion 213 can be an integral structure, which are bent together; in other examples, the first sub-wall portion 2111 and the third wall portion 213 can be separate structures, which are connected by welding or other suitable means.
[0127] In some examples, the third wall portion 213 and the second sub-wall portion 2121 can be an integral structure, which are bent together; in other examples, the first sub-wall portion 2111 and the third wall portion 213 can be separate structures, which are connected by welding or other suitable means.
[0128] The first housing portion 21c and the second housing portion 21d both include two second sub-wall portions 2121. The two second sub-wall portions 2121 of the first housing portion 21c are arranged opposite each other along the second direction Y, and the two second sub-wall portions 2121 of the second housing portion 21d are arranged opposite each other along the second direction Y.
[0129] The first housing portion 21c and the second housing portion 21d are opposite to each other along the third direction Z and connected to each other. The first sub-wall portion 2111 of the first housing portion 21c and the first sub-wall portion 2111 of the second housing portion 21d are welded together, and the second sub-wall portion 2121 of the first housing portion 21c and the second sub-wall portion 2121 of the second housing portion 21d are welded together.
[0130] The third wall portion 213 of the first housing portion 21c and the first sub-wall portion 2111 of the first housing portion 21c can be directly connected by bending, welding or other means. The third wall portion 213 of the first housing portion 21c and the second sub-wall portion 2121 of the first housing portion 21c can be directly connected by bending, welding or other means.
[0131] The third wall portion 213 of the second housing portion 21d and the first sub-wall portion 2111 of the second housing portion 21d can be directly connected by bending, welding or other means. The third wall portion 213 of the second housing portion 21d and the second sub-wall portion 2121 of the second housing portion 21d can be directly connected by bending, welding or other means.
[0132] In the embodiments of this application, direct connection means that no other wall is provided between the two directly connected wall portions.
[0133] The first housing portion 21c being a one-piece structure means that all wall portions of the first housing portion 21c are integral. In some examples, the first housing portion 21c can be a one-piece molded structure, and the first housing portion 21c can be formed into the desired shape in a single processing or casting process. For example, the first housing portion 21c can be formed by stamping. In other examples, the first housing portion 21c can also be formed after multiple processing or casting processes. For example, the first housing portion 21c can be formed into a predetermined shape by a bending process, and then two adjacent wall portions can be connected by welding or other means.
[0134] The second housing portion 21d being a one-piece structure means that all walls of the second housing portion 21d are integral. In some examples, the second housing portion 21d can be a one-piece molded structure, and the second housing portion 21d can be formed into the desired shape in a single processing or casting process. For example, the second housing portion 21d can be formed by stamping. In other examples, the second housing portion 21d can also be formed after multiple processing or casting processes. For example, the second housing portion 21d can be formed into a predetermined shape by bending, and then the adjacent two walls can be connected by welding or other means.
[0135] The housing 21 in this embodiment includes a first housing portion 21c and a second housing portion 21d. The first housing portion 21c and the second housing portion 21d are both integral structures, which helps to reduce the number of welding operations of the first housing portion 21c and the second housing portion 21d, thereby improving the production efficiency and yield of the housing 21.
[0136] In some embodiments, the first housing portion 21c and the second housing portion 21d are symmetrically arranged.
[0137] The two first sub-wall portions 2111 have the same dimension along the third direction Z, and the two second sub-wall portions 2121 of the same second wall portion 212 have the same dimension along the third direction Z.
[0138] The first housing portion 21c and the second housing portion 21d are connected by butt welding. For example, the first sub-wall portion 2111 of the first housing portion 21c and the first sub-wall portion 2111 of the second housing portion 21d are butt welded together, and the second sub-wall portion 2121 of the first housing portion 21c and the second sub-wall portion 2121 of the second housing portion 21d are butt welded together.
[0139] The first housing portion 21c and the second housing portion 21d are symmetrically arranged. The first housing portion 21c and the second housing portion 21d have the same structure, which is beneficial to improving the interchangeability of the parts of the housing 21, thereby improving the production efficiency of the battery cell 6.
[0140] In some embodiments, the first housing portion 21c is formed by bending a sheet metal. The third wall portion 213, the first sub-wall portion 2111, and the two adjacent second sub-wall portions 2121 of the first housing portion 21c are bent and connected or welded together.
[0141] A sheet material with a specific shape can be bent to form a third wall portion 213, a first sub-wall portion 2111, and two second sub-wall portions 2121 of the first housing portion 21c. The shape of the sheet material can be flexibly designed as needed. Different shapes of the sheet material result in different crease positions after bending, and the two wall portions that need to be welded to the first housing portion 21c will also be different.
[0142] In some examples, referring to Figures 8 and 9, in the first housing portion 21c, a crease (i.e. a bending connection) can be formed between the third wall portion 213 and the first sub-wall portion 2111, and a crease can be formed between the third wall portion 213 and the second sub-wall portion 2121. The two ends of the first sub-wall portion 2111 along the second direction Y are respectively welded to the two second sub-wall portions 2121.
[0143] Figure 13 is a structural schematic diagram of the first or second housing portion of the housing shown in Figures 10 to 12 connected in a first manner. Figure 14 is a structural schematic diagram of the first or second housing portion shown in Figure 13 in an unfolded state. The dotted lines in Figure 13 indicate fillet weld positions. In some other examples, referring to Figures 13 and 14, in the first housing portion 21c, a crease may be formed between the third wall portion 213 and the second sub-wall portion 2121, and a crease may be formed between the first sub-wall portion 2111 and one of the second sub-wall portions 2121. The first sub-wall portion 2111 is welded to the third wall portion 213 and the other second sub-wall portion 2121.
[0144] Figure 15 is a structural schematic diagram of the first or second housing portion of the housing shown in Figures 10 to 12 connected in a second manner. Figure 16 is a structural schematic diagram of the first or second housing portion shown in Figure 15 in an unfolded state. The dotted lines in Figure 15 indicate fillet weld positions. In some other examples, referring to Figures 15 and 16, in the first housing portion 21c, creases are formed between the first sub-wall portion 2111 and both second sub-wall portions 2121, and a crease is formed between one of the second sub-wall portions 2121 and the third wall portion 213. The third wall portion 213 is welded to the first sub-wall portion 2111 and the other second sub-wall portion 2121.
[0145] Figure 17 is a structural schematic diagram of the first or second housing portion of the housing shown in Figures 10 to 12 connected by a third method. Figure 18 is a structural schematic diagram of the first or second housing portion shown in Figure 17 in an unfolded state. The dotted lines in Figure 17 indicate fillet weld positions. In some further examples, referring to Figures 17 and 18, in the first housing portion 21c, a crease may be formed between the first sub-wall portion 2111 and the third wall portion 213, and creases are formed between the first sub-wall portion 2111 and both second sub-wall portions 2121. The third wall portion 213 is welded to the two second sub-wall portions 2121.
[0146] The first housing portion 21c is formed by bending a single piece of sheet metal. At least two adjacent walls of the first housing portion 21c are bent and connected without welding or other connection operations, which helps to improve production yield. The uniform thickness between the walls of the first housing portion 21c helps to improve structural stability.
[0147] In some embodiments, referring to Figures 4 and 5, the dimension of the housing 21 along the second direction Y is greater than the dimension of the housing 21 along the third direction Z. The first sub-wall portion 2111 of the first housing portion 21c is welded to the two second sub-wall portions 2121 of the first housing portion 21c at both ends along the second direction Y.
[0148] The third wall portion 213 of the first housing portion 21c is bent and connected to the first sub-wall portion 2111 of the first housing portion 21c, and the third wall portion 213 of the first housing portion 21c is bent and connected to both second sub-wall portions 2121 of the first housing portion 21c.
[0149] The welding position of the first housing portion 21c is formed between the adjacent edges of the first sub-wall portion 2111 and the second sub-wall portion 2121. The first sub-wall portion 2111 is perpendicular to the second sub-wall portion 2121, and the welding between the first sub-wall portion 2111 and the second sub-wall portion 2121 is a fillet weld.
[0150] The shell 21 is relatively long along the second direction Y, and the length of the butt weld between the first shell part 21c and the second shell part 21d is relatively long; the shell 21 is relatively short along the third direction Z, which can shorten the length of the fillet weld between the first sub-wall part 2111 and the second sub-wall part 2121 of the first shell part 21c, which is beneficial to further improve the welding yield and welding efficiency.
[0151] In some embodiments, the second housing portion 21d is formed by bending a sheet metal. The third wall portion 213, the first sub-wall portion 2111, and the two adjacent second sub-wall portions 2121 of the second housing portion 21d are bent together or welded.
[0152] A sheet material with a specific shape can be bent to form a third wall portion 213, a first sub-wall portion 2111, and two second sub-wall portions 2121 of the second housing portion 21d. The shape of the sheet material can be flexibly designed as needed. Different shapes of the sheet material result in different crease positions after bending, and the two wall portions that need to be welded to the second housing portion 21d will also be different.
[0153] Since the second housing portion 21d has the same or similar structure as the first housing portion 21c, the crease position of the second housing portion 21d and the embodiments of the two wall portions that need to be welded can be referred to the description of the first housing portion 21c, and will not be repeated here.
[0154] The second shell section 21d is formed by bending a single piece of sheet metal. At least two adjacent walls of the second shell section 21d are bent and connected without welding or other connection operations, which helps to improve production yield. The uniform thickness between the walls of the second shell section 21d helps to improve structural stability.
[0155] When the first housing portion 21c and the second housing portion 21d are symmetrical, the first housing portion 21c and the second housing portion 21d can be formed by bending plates of the same shape. The plates required to form the first housing portion 21c and the second housing portion 21d can be cut in one cutting process without changing the cutting path, which helps to improve the interchangeability of the plates and the cutting efficiency, thereby improving the production efficiency of the battery cell 6.
[0156] In some embodiments, referring to Figures 4 and 5, the dimension of the housing 21 along the second direction Y is greater than the dimension of the housing 21 along the third direction Z. The first sub-wall portion 2111 of the second housing portion 21d is welded to the two second sub-wall portions 2121 of the second housing portion 21d at both ends along the second direction Y.
[0157] The third wall portion 213 of the second housing portion 21d is bent and connected to the first sub-wall portion 2111 of the second housing portion 21d, and the third wall portion 213 of the second housing portion 21d is bent and connected to both second sub-wall portions 2121 of the second housing portion 21d.
[0158] The welding position of the second housing portion 21d is formed between the adjacent edges of the first sub-wall portion 2111 and the second sub-wall portion 2121. The first sub-wall portion 2111 is perpendicular to the second sub-wall portion 2121, and the welding between the first sub-wall portion 2111 and the second sub-wall portion 2121 is a fillet weld.
[0159] The shell 21 is relatively long along the second direction Y, and the length of the butt weld required between the first shell part 21c and the second shell part 21d is relatively long; the shell 21 is relatively short along the third direction Z, which can shorten the length of the fillet weld required between the first sub-wall part 2111 and the second sub-wall part 2121 of the second shell part 21d, which is beneficial to further improve the welding yield and welding efficiency.
[0160] In some embodiments, the base metal of the first wall portion 211, the second wall portion 212, and the third wall portion 213 is steel.
[0161] In the embodiments of this application, the base metal of the wall refers to the main metal component of the wall.
[0162] The primary metal component of the first wall portion 211, the second wall portion 212, and the third wall portion 213 is steel. The first wall portion 211, the second wall portion 212, and the third wall portion 213 may also include aluminum or other materials.
[0163] The materials of the first wall portion 211, the second wall portion 212, and the third wall portion 213 can be the same or different.
[0164] Optionally, the first wall portion 211, the second wall portion 212, and the third wall portion 213 can all be made of steel, steel alloy, or other composite or alloy structures with steel as the main component.
[0165] Steel has good mechanical strength, which can improve the overall structural strength of the casing 21. At the same time, it can also appropriately reduce the thickness of the casing 21, which is beneficial to improving the energy density of the battery cell 6. Steel has good corrosion resistance, which helps to reduce the risk of the casing 21 being corroded by the electrolyte and improves the reliability of the battery cell 6.
[0166] In some embodiments, the battery cell 6 includes an end cap 22, which is connected to the housing 21 and covers the opening 21a.
[0167] The end cap 22 and the housing 21 together form a relatively enclosed space for accommodating the electrode assembly 10 and electrolyte, etc.
[0168] The end cap 22 can be made of the same material as the housing 21, or they can be different materials.
[0169] According to some embodiments of this application, this application also provides a battery device 2, which includes a plurality of battery cells 6 provided in any of the above embodiments.
[0170] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 2 of any of the above embodiments, the battery device 2 being used to provide electrical energy.
[0171] The battery cell 6 provided in this embodiment includes an electrode assembly 10 and a housing 21. The housing 21 has an opening 21a on one side along a first direction X. The housing 21 includes a first wall portion 211 opposite to the opening 21a, two second wall portions 212 opposite to each other along a second direction Y, and two third wall portions 213 opposite to each other along a third direction Z. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular. The first wall portion 211, the second wall portion 212, and the third wall portion 213 enclose a receiving cavity 21b, within which the electrode assembly 10 is disposed. The first wall portion 211 includes two first sub-wall portions 2111 arranged along the third direction Z, and the two first sub-wall portions 2111 are welded together. Each second wall portion 212 includes two second sub-wall portions 2121 arranged along the third direction Z, and the two second sub-wall portions 2121 of the same second wall portion 212 are welded together. Two first sub-wall portions 2111 are directly connected to two third wall portions 213, and each third wall portion 213 is directly connected at both ends along the second direction Y to one of the second sub-wall portions 2121 of the two second wall portions 212. One third wall portion 213, the first sub-wall portion 2111 directly connected to it, and the second sub-wall portion 2121 directly connected to it form a first housing portion 21c, which is an integral structure. Another third wall portion 213, the first sub-wall portion 2111 directly connected to it, and the second sub-wall portion 2121 directly connected to it form a second housing portion 21d, which is also an integral structure. The first housing portion 21c and the second housing portion 21d are symmetrically arranged. The first housing portion 21c is formed by bending a steel plate, and the two ends of the first sub-wall portion 2111 of the first housing portion 21c along the second direction Y are respectively welded to the two second sub-wall portions 2121 of the first housing portion 21c. The second housing portion 21d is formed by bending a steel plate, and the two ends of the first sub-wall portion 2111 of the second housing portion 21d along the second direction Y are respectively welded to the two second sub-wall portions 2121 of the second housing portion 21d.
[0172] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A single battery cell, comprising: Electrode assembly; as well as The housing has an opening on one side along a first direction. The housing includes a first wall portion opposite to the opening, two second wall portions opposite to each other along a second direction, and two third wall portions opposite to each other along a third direction. The first direction, the second direction, and the third direction intersect each other. The first wall portion, the second wall portion, and the third wall portion enclose a receiving cavity, and the electrode assembly is disposed within the receiving cavity. At least one of the first wall portion and the two second wall portions is bent and connected to the third wall portion. The first wall portion includes two first sub-wall portions arranged along the third direction, and the two first sub-wall portions are welded together. Each second wall portion includes two second sub-wall portions arranged along the third direction, and the two second sub-wall portions of the same second wall portion are welded together.
2. The battery cell according to claim 1, wherein, The first sub-wall portion has a first outer surface facing away from the receiving cavity; The two first sub-wall portions are welded together to form a first weld portion, which is located in the direction of the opening toward the first wall portion and does not extend beyond the first outer surface.
3. The battery cell according to claim 2, wherein, Along the first direction, the first outer surfaces of the two first sub-walls are flush.
4. The battery cell according to claim 2 or 3, wherein, Along the third direction, the distance between the first welded portion and the two third wall portions is the same.
5. The battery cell according to any one of claims 1-4, wherein, The second sub-wall portion has a second outer surface facing away from the receiving cavity; The two second sub-wall portions of the second wall portion are welded together to form a second weld portion, and the second weld portion does not extend beyond the second outer surface of the two second sub-wall portions connected to it in the direction away from the receiving cavity.
6. The battery cell according to claim 5, wherein, Along the second direction, the second outer surfaces of the two second sub-walls of the same second wall portion are flush.
7. The battery cell according to claim 5 or 6, wherein, Along the third direction, the distance between the second welded portion and the two third wall portions is the same.
8. The battery cell according to any one of claims 1-7, wherein, The two first sub-wall portions are directly connected to the two third wall portions respectively, and the two ends of each third wall portion along the second direction are directly connected to one of the second sub-wall portions of the two second wall portions respectively; One of the third wall portions, the first sub-wall portion directly connected to the one of the third wall portions, and the second sub-wall portion directly connected to the one of the third wall portions form a first housing portion, the first housing portion being an integral structure; The other third wall portion, the first sub-wall portion directly connected to the other third wall portion, and the second sub-wall portion directly connected to the other third wall portion form a second housing portion, the second housing portion being an integral structure.
9. The battery cell according to claim 8, wherein, The first housing portion and the second housing portion are arranged symmetrically.
10. The battery cell according to claim 8 or 9, wherein, The first housing part is formed by bending a sheet metal; The third wall portion, the first sub-wall portion, and the two adjacent second sub-wall portions of the first housing portion are bent or welded together.
11. The battery cell according to claim 10, wherein, The dimension of the housing along the second direction is greater than the dimension of the housing along the third direction; The first sub-wall portion of the first housing portion is welded to the two second sub-wall portions of the first housing portion at both ends along the second direction.
12. The battery cell according to any one of claims 8-11, wherein, The second housing is formed by bending sheet metal; The third wall portion, the first sub-wall portion, and two adjacent second sub-wall portions of the second housing portion are bent or welded together.
13. The battery cell according to claim 12, wherein, The dimension of the housing along the second direction is greater than the dimension of the housing along the third direction; The first sub-wall portion of the second housing portion is welded to the two second sub-wall portions of the second housing portion at both ends along the second direction.
14. The battery cell according to any one of claims 1-13, wherein, The base metal of the first wall portion, the second wall portion, and the third wall portion are all steel.
15. The battery cell according to any one of claims 1-14, wherein, The battery cell includes an end cap, which is connected to the housing and covers the opening.
16. A battery device comprising a plurality of battery cells according to any one of claims 1-15.
17. An electrical device comprising a battery device according to claim 16, the battery device being used to provide electrical energy.