Battery cell manufacturing method, battery cell, battery, and electric device

Abstract

A battery cell (20) manufacturing method, a battery cell (20), a battery (100), and an electric device. The battery cell (20) manufacturing method comprises: connecting an electrode lead-out member (221) of a bare core (22) to an electrode component (25); bending the connected electrode lead-out member (221), so that the bare core (22) enters an accommodating space (212) of a housing (21) by means of an opening (2121), wherein the opening (2121) of the housing (21) is a side surface having the largest area of the housing (21); and connecting a top cover (24) to the housing (21) so as to close the opening (2121). The bare core (22) of the battery cell (20) can still be conveniently mounted when the electrode component (25) is not arranged on the top cover (24).

Description

Method for manufacturing battery cell, battery cell, battery and power-consuming device

[0001] This application claims priority to Chinese Patent Application No. 2023111810073, filed on September 13, 2023, entitled “METHOD FOR MANUFACTURING BATTERY CELL, BATTERY CELL, BATTERY AND ELECTRIC DEVICE,” the entire contents of which are incorporated herein by reference.

Technical field

[0002] The present disclosure relates to the field of battery technology, and in particular to a method for manufacturing a battery cell, a battery cell, a battery, and an electrical device. [Background Technology]

[0003] Rechargeable batteries are widely used in electric vehicles, mobile devices, and power tools due to their high energy density, high power density, high cycle life, and long storage life. Existing battery cells typically consist of a bare cell, a housing, a top cover, and an electrode assembly. The electrode assembly is mounted on the top cover. When the cell is connected to the top cover, it forms an electrical connection with the electrode assembly and is then mounted to the housing along with the top cover. However, without the electrode assembly mounted on the top cover, the bare cell is difficult to install.

[0004] [Summary of the invention]

[0005] In the first aspect, the present application provides a battery cell, which includes a bare cell, a top cover and a shell. The shell has an opening, which is connected to the top cover. The top cover is provided with an opening and forms an accommodation space with the shell. The bare cell is arranged in the accommodation space, and the opening is located on the side of the shell with the largest area. An electrode lead-out piece is provided on one side of the bare cell, the shell includes an electrode component or the shell is connected to the electrode component, the electrode lead-out piece is connected to the electrode component, and the electrode lead-out piece is a bent structure.

[0006] Through this method, the bare cell can be installed into the casing through the opening on the side with the largest area, and effectively connect with the electrode components located on the casing, allowing for efficient assembly of the battery cell. Furthermore, the bent structure of the electrode lead-out member makes the electrode lead-out member more compact, taking up less space, thereby reducing the gap between the bare cell and the casing and improving the energy density per unit volume of the battery cell.

[0007] In some embodiments, the electrode lead-out member includes a tab, which is disposed on one side of the bare cell. The tab connects the bare cell and the electrode component, and the tab is a bent structure.

[0008] Through the above method, the bare battery cell can be conveniently connected to the electrode component through the tab to form a current loop.

[0009] In some embodiments, the electrode lead includes a tab and a connecting piece. The tab is arranged on one side of the bare battery cell. One end of the connecting piece is connected to the tab, and the other end of the connecting piece is connected to the electrode component. The tab and / or the connecting piece are bent structures.

[0010] Through the above method, the tabs provided on the bare battery cell do not need to be directly connected to the electrode components, the tab connection methods are more diverse, and the battery cell installation is more flexible.

[0011] In some embodiments, the connecting piece includes a first connecting portion connected to the tab and a second connecting portion connected to the electrode component, the first connecting portion is bent relative to the second connecting portion, and the tab extends between the first connecting portion and the second connecting portion.

[0012] Through this method, the tab can be at least partially located in the gap between the first and second connecting portions, formed by the bending of the first connecting portion. This compact structure of the tab and the connecting piece can occupy less storage space, allowing the bare cell to occupy a higher volume within the storage space, which helps improve the energy density of the battery cell.

[0013] In some embodiments, the connecting piece includes a first connecting piece and a second connecting piece, one end of the first connecting piece is connected to the electrode ear, and the other end is connected to the second connecting piece, one end of the second connecting piece is connected to the first connecting piece, and the other end is connected to the electrode component, and at least one of the electrode ear, the first connecting piece, and the second connecting piece is a bent structure.

[0014] Through the above method, the first connecting piece and the second connecting piece make the connection between the tab and the electrode component more diverse, and the battery cell installation is more flexible.

[0015] In some embodiments, the shell includes a bottom plate and a plurality of side plates. The side plates extend along the periphery of the bottom plate and together with the bottom plate form a receiving space. An electrode component is provided on at least one of the side plates.

[0016] Through the above method, the housing can well accommodate the bare battery cell. Furthermore, placing the electrode components on the side panels further facilitates connection between the electrode components and the tabs, resulting in a streamlined battery cell structure. In some embodiments, the distance between the bare battery cell and the side panel of the housing where the electrode components are not located is 0.5 mm to 2 mm.

[0017] This method allows for a smaller gap between the bare cell and the side panels without electrode components, further confining the bare cell within the storage space. This makes it less likely for the bare cell to shake, improving the stability of the battery cell. Furthermore, the bare cell occupies a larger volume within the battery cell, which helps increase the amount of energy that can be stored per unit volume.

[0018] In some embodiments, a support plate is provided between the bare battery cell and the side plate of the housing where no electrode components are provided.

[0019] Through the above method, the support plate can fill the gap between the bare battery cell and the side plate of the shell, thereby reducing the shaking of the bare battery cell in the shell and making the installation of the bare battery cell more stable.

[0020] In some embodiments, the support plate includes a bottom support plate, which is arranged between the bare battery cell and a side plate in the shell that is arranged opposite to the side plate where the electrode component is arranged.

[0021] Through the above method, the bottom support plate can fill the gap between the bare battery cell and the side plate in the shell that is opposite to the side plate with the electrode component, which is helpful to reduce the shaking of the bare battery cell in the shell and make the installation of the bare battery cell more stable.

[0022] In some embodiments, the support plate includes a side support plate, which is disposed between the bare battery cell and a side plate in the housing adjacent to the side plate on which the electrode component is disposed.

[0023] Through the above method, the side support plate can fill the gap between the bare battery cell and the side plate in the shell adjacent to the side plate with the electrode component, which is beneficial to reduce the shaking of the bare battery cell in the shell and make the installation of the bare battery cell more stable.

[0024] In some embodiments, the shell includes a bottom plate and multiple side plates. The side plates extend along the periphery of the bottom plate and form a accommodating space together with the bottom plate. A flange edge is connected to the side of the side plate away from the bottom plate. The flange edge extends from the end of the side plate away from the bottom plate to the outside of the accommodating space, and the top cover is connected to the flange edge.

[0025] In the above manner, the top cover is connected to the flange edge of the shell. By setting the connection position at the flange edge, the distance between the connection position of the top cover and the flange edge and the bare cell can be increased, thereby avoiding damage to the bare cell due to light leakage during the connection process of the top cover and the flange edge. In addition, it can also reduce the damage to the bare cell caused by particulate matter falling into the bare cell, thereby protecting the bare cell and improving the reliability and safety of the battery cell.

[0026] In some embodiments, the side panel is connected to the bottom panel via a first transition angle, and the side panel is connected to the flange edge via a second transition angle.

[0027] Through the above method, the first turning angle and the second turning angle can improve the stability of the shell, thereby improving the stability of the connection between the top cover and the flange edge, thereby being able to electrically protect the bare battery cell.

[0028] In some embodiments, the radius of the second transition angle is less than or equal to 0.2 mm. Through the above method, the connection stability between the side plate and the flange edge is increased.

[0029] In some embodiments, the side panels are arranged around the bottom panel, the flange is arranged around the side panels, and the flange is connected to the top cover.

[0030] Through the above method, each side panel is provided with a corresponding flange edge, and the top cover is connected to all the flange edges, so that the connection positions are all located on the flange edges, thereby improving the protection performance of the bare battery cell.

[0031] In some embodiments, the edge of the top cover is aligned with the edge of the flange away from the side panel.

[0032] By adopting the above-mentioned method, the top cover and / or flange edge is prevented from puncturing adjacent battery cells or the battery box, etc.; and the structure of the battery cell itself can be made more compact, which is convenient for subsequent series or parallel connection of multiple battery cells.

[0033] In some embodiments, the housing is an integrally formed structure.

[0034] By adopting the above method, the shell is more stable, thereby improving the stability of the flange edge connected to the top cover of the shell.

[0035] In some embodiments, the maximum distance between the edge of the flange away from the side panel and the outer surface of the side panel is no greater than 5 mm.

[0036] Through the above method, the distance between the actual connection position between the flange edge and the top cover and the bare battery cell is limited, thereby reducing damage to the bare battery cell caused by laser leakage and falling particulate matter.

[0037] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0038] In a third aspect, the present application provides an electrical device, which includes the battery of the above embodiment, and the battery is used to power the electrical device.

[0039] Fourthly, the present application provides a method for manufacturing a battery cell, which includes: connecting the electrode lead-out piece of the bare battery cell to the electrode component; bending the electrode lead-out piece after connection so that the bare battery cell enters the accommodating space of the shell through the opening, and the opening of the shell is the side of the shell with the largest area; connecting the top cover to the shell to close the opening.

[0040] Through the above method, the bare cell can form a stable electrical connection with the electrode component and can be directly installed into the housing by bending the electrode lead. The bare cell can be easily installed with the electrode component set in the housing, and the battery cell can be assembled efficiently.

[0041] In some embodiments, the shell includes a bottom plate and multiple side plates. The side plates extend along the periphery of the bottom plate and form a accommodating space together with the bottom plate. The opening is arranged opposite to the bottom plate, and the electrode component is the bottom plate or the side plate of the shell.

[0042] Through the above method, the tabs are directly connected to the bottom plate or side plate, resulting in a simple connection structure and easy production. This also helps reduce the structure between the bare cell and the housing, increasing the volume of the bare cell in the storage space, thereby enhancing the energy density of the battery cell. In some embodiments, the housing includes a bottom plate and multiple side plates, which extend along the periphery of the bottom plate and together with the bottom plate form a storage space. The opening is arranged opposite the bottom plate, and the electrode component is arranged on at least one of the side plates.

[0043] By adopting the above method, the electrode components are arranged on the side plates, which is more conducive to the connection between the electrode components and the tabs, and the battery cell structure is simplified.

[0044] In some embodiments, the electrode lead-out member includes a tab, and the step of connecting the electrode lead-out member of the bare cell to the electrode component includes: welding the tab of the bare cell to the electrode component.

[0045] Through the above method, the bare battery cell can conveniently connect the tabs to the electrode components to form a current loop.

[0046] In some embodiments, the electrode lead-out member includes a tab and a connecting piece, and the step of connecting the electrode lead-out member of the bare cell to the electrode component includes: welding the tab of the bare cell to the connecting piece; and welding the connecting piece to the electrode component.

[0047] This method eliminates the need for direct connection of the tab to the electrode component, allowing for more flexible connection and easier installation of the battery cell. Furthermore, the connecting piece can distribute the tensile force between the tab and the electrode component, making the tab less susceptible to breakage.

[0048] In some embodiments, the electrode lead-out member includes a tab, a first connecting piece, and a second connecting piece. The steps of connecting the electrode lead-out member of the bare battery cell to the electrode component include: welding the tab of the bare battery cell to the first connecting piece; welding the first connecting piece to the second connecting piece; and welding the second connecting piece to the electrode component.

[0049] Through the above method, the tab and the electrode component are connected via the first and second connecting sheets. The first and second connecting sheets can better share the tensile force between the tab and the electrode component, making the tab less likely to break. Furthermore, the connection between the tab and the electrode component can be split into multiple steps, making battery cell installation more flexible.

[0050] In some embodiments, the shell includes a bottom plate, and the opening is arranged opposite to the bottom plate. Before the step of connecting the electrode lead of the bare battery cell to the electrode component, the step also includes: making a preset angle between the bare battery cell and the bottom plate.

[0051] Through the above method, the preset angle provides a good welding posture for the bare cell and the electrode component, thereby improving the welding quality of the bare cell and the electrode component. At the same time, the preset angle places the bare cell in a more convenient bending position, improving the efficiency of installing the bare cell into the storage space.

[0052] In some embodiments, the preset angle is not less than 45 degrees and not greater than 135 degrees.

[0053] Through the above method, the bare battery cell and the electrode component can be welded with a better welding posture, the welding heat input is more uniform, the base material is fused more fully, the probability of cold welding is reduced, and the weld quality is better.

[0054] In some embodiments, in the step of connecting the electrode lead-out pieces of the bare battery cell to the electrode component, the bare battery cell is perpendicular to the bottom plate.

[0055] Through the above method, the contact area between the bare battery cell and the electrode component is larger, the welding posture is good, the welding heat input is more uniform, the base material is more fully fused, and the weld quality is better.

[0056] In some embodiments, before the step of connecting the top cover to the shell to close the opening, the method further includes placing a support plate between the shell and at least one side of the bare cell where no electrode lead-out piece is provided.

[0057] Through the above method, the support plate can fill the gap between the bare battery cell and the side plate of the shell, thereby reducing the shaking of the bare battery cell in the shell and making the installation of the bare battery cell more stable.

[0058] In some embodiments, a flange edge is provided on one side of the shell facing the top cover, and the flange edge extends in a direction away from the accommodating space. The step of connecting the top cover to the shell to close the opening includes: covering the opening with the top cover and welding the top cover to the flange edge.

[0059] Through the above method, the distance between the connection position of the top cover and the flange edge and the battery cell is increased, which is beneficial to reduce the probability of battery cell damage caused by light leakage during the connection process of the top cover and the flange edge; in addition, it can also reduce the damage to the battery cell caused by particulate matter falling into the battery cell, thereby protecting the battery cell and improving the reliability and safety of the battery cell.

[0060] In some embodiments, after the steps of covering the opening with the top cover and welding the top cover to the flange edge, the steps further include: cutting the welded flange edge and the top cover, removing the edge of the flange edge away from the accommodating space, and removing the edge of the top cover.

[0061] By adopting the above method, the space occupied by the flange edge and the top cover can be reduced, thereby reducing the space occupied by the battery cell.

[0062] In some embodiments, before the step of welding the electrode lead-out piece of the bare battery cell to the electrode component, the method further includes the step of wrapping an insulating film on the outer surface of the bare battery cell.

[0063] Through the above method, the insulation performance of the outer surface of the bare battery cell is better, and at the same time the insulating film protects the outer surface of the bare battery cell, reducing the probability of the bare battery cell being bumped and scratched when it is installed in the shell.

[0064] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

Brief Description of the Drawings

[0065] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0066] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0067] FIG2 is an exploded schematic diagram of a battery according to one or more embodiments;

[0068] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0069] FIG4 is a first structural diagram of a battery cell according to one or more embodiments;

[0070] FIG5 is an enlarged schematic diagram of A in FIG4 ;

[0071] FIG6 is a schematic diagram of another embodiment of A in FIG4 ;

[0072] FIG7 is a second structural schematic diagram of a battery cell according to one or more embodiments;

[0073] FIG8 is a schematic cross-sectional view of BB in FIG7 ;

[0074] FIG9 is a schematic cross-sectional view of CC in FIG7 ;

[0075] FIG10 is a third structural schematic diagram of a battery cell according to one or more embodiments;

[0076] FIG11 is an enlarged schematic diagram of D in FIG10 ;

[0077] FIG12 is a fourth structural diagram of a battery cell according to one or more embodiments;

[0078] FIG13 is an enlarged schematic diagram of E in FIG12 ;

[0079] FIG14 is a fifth structural diagram of a battery cell according to one or more embodiments;

[0080] FIG15 is a cross-sectional view of a battery cell according to one or more embodiments;

[0081] FIG16 is a flowchart according to one or more embodiments;

[0082] FIG17 is another flowchart according to one or more embodiments;

[0083] FIG18 is a schematic diagram of another process according to one or more embodiments;

[0084] FIG19 is a schematic diagram of another flow chart according to one or more embodiments.

[0085] The accompanying drawings in the specific implementation manner are as follows:

[0086] 1000, vehicle; 200, controller; 300, motor; 100, battery; 10, housing; 11, first part; 12, second part;

[0087] 20. Battery cell; 21. Shell; 212. Accommodation space; 2121. Opening; 213. Bottom plate; 214. Side plate; 2141. Flange edge; 22. Bare cell; 221. Electrode lead-out member; 2211. Tab; 2212. Connecting piece; 2212a. First connecting portion; 2212b. Second connecting portion; 2212c. First connecting piece; 2212d. Second connecting piece; 23. Support plate; 231. Bottom support plate; 232. Side support plate; 24. Top cover; 25. Electrode component. [Specific implementation method]

[0088] The following embodiments of the technical solution of the present application are described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only used as examples and are not intended to limit the scope of protection of the present application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of the present application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise clearly and specifically defined, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two (including two), and "multiple pieces" refers to more than two (including two).

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0094] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0095] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0096] During the assembly process of a battery cell, the bare cell needs to be placed in the housing and electrically connected to the electrode assembly. In related art, the electrode assembly is mounted on the top cover. When the bare cell is connected to the top cover, it forms an electrical connection with the electrode assembly and is then installed into the housing along with the top cover. However, if the electrode assembly is not mounted on the top cover, the bare cell cannot be electrically connected to the electrode assembly when connected to the top cover, and the welding posture between the bare cell and the electrode assembly changes, making installation difficult.

[0097] Based on the above considerations, in order to solve the technical problems existing in battery cells in the prior art, the present application proposes a method for manufacturing battery cells, which can easily complete the installation of the bare cell of the battery cell when the electrode components are arranged on the shell and the top cover is located on the side with the largest area of ​​the bare cell.

[0098] The present application provides an electrical device, which may include but is not limited to mobile phones, tablets, computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. The electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the spacecraft may include airplanes, rockets, space shuttles, and spacecraft. The electrical device may include a battery, which may provide electrical energy to the device to achieve its corresponding function.

[0099] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0100] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle according to one or more embodiments.

[0101] The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A battery 100 is provided inside the vehicle 1000. 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 serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000.

[0102] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] In order to improve the performance of electrical devices, the present application also provides a battery 100. Please refer to Figure 2, which is an exploded view of the battery 100 provided in some embodiments of the present application. The shape of the battery 100 includes but is not limited to a square. In other embodiments, the shape of the battery 100 can also be cylindrical, square or any other shape. The energy storage device is a type of battery 100, which can be used as a power grid, or in scenarios such as home life or business, for storing and / or releasing electrical energy. The energy storage device can be an energy storage cabinet, an energy storage container, etc.

[0104] In some embodiments, the battery 100 may include a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and may have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 may also each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0105] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0106] Each battery cell 20 may be a secondary battery or a primary battery, and 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.

[0107] The battery cell 20 includes bare cells, and the manufacturing methods of bare cells include stacking and winding, that is, the battery 100 is divided into two types: stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but it has extremely high requirements for mold precision, high equipment investment, and a relatively complex process, resulting in low production efficiency. The winding battery is simple to manufacture, and the production and assembly processes have general requirements for equipment precision, high production efficiency, and low cost. In terms of performance, the wound battery has excellent high and low temperature performance, very fast charging, ultra-long life, stable high output voltage, strong structure, and strong shock resistance. Please refer to Figure 3, which is a schematic diagram of the decomposition structure of the battery cell according to one or more embodiments. The battery cell 20 refers to the smallest unit that makes up the battery. The battery cell 20 includes a top cover 24, a shell 21, a bare cell 22 and other functional components.

[0108] The top cover 24 is a component that covers the opening 2121 of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the top cover 24 can be adapted to the shape of the housing 21 to fit the housing 21. Optionally, the top cover 24 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the top cover 24 from deforming when subjected to compression or collision, giving the battery cell 20 greater structural strength and improved safety. The top cover 24 can also be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, the top cover 24 can also be provided with a vent valve assembly for venting internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member can also be provided on the inside of the top cover 24 to isolate the electrical connections within the housing 21 from the top cover 24 to reduce the risk of short circuits. Exemplary insulating members can be plastic, rubber, etc.

[0109] The shell 21 is a component used to cooperate with the top cover 24 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the bare battery cell 22, electrolyte and other components. The shell 21 and the top cover 24 can be independent components. An opening 2121 can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening 2121 with the top cover 24 at the opening 2121. Without limitation, the top cover 24 and the shell 21 can also be integrated. Specifically, the top cover 24 and the shell 21 can form a common connection surface before other components are put into the shell. When the interior of the shell 21 needs to be encapsulated, the top cover 24 is covered with the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the bare battery cell 22. The material of the shell 21 can be various, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0110] The bare cell 22 is the component where the electrochemical reaction occurs in the battery cell 20. One or more bare cells 22 may be contained in the shell 21. The bare cell 22 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the cell body of the bare cell 22, and the parts of the positive and negative electrode sheets without active materials each constitute the tabs 2211. During the charge and discharge process of the battery cell 20, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs 2211 connect the electrode components 25 to form a current loop.

[0111] Please refer to Figures 4 to 6. Figure 4 is a schematic diagram of a first structure of a battery cell according to one or more embodiments; Figure 5 is an enlarged schematic diagram of A in Figure 4; and Figure 6 is a schematic diagram of another embodiment of A in Figure 4. In conjunction with Figures 1 to 3, according to some embodiments of the present application, the present application further provides a battery cell 20. The battery cell 20 includes a bare cell 22, a top cover 24, and a housing 21. The housing 21 has an opening 2121. The housing 21 is connected to the top cover 24. The top cover 24 covers the opening 2121 to form an accommodating space 212. The bare cell 22 is disposed in the accommodating space 212. The opening 2121 is located on the side of the housing 21 with the largest surface area. An electrode lead 221 is disposed on one side of the bare cell 22. The housing 21 includes an electrode component 25 or is connected to the housing 21. The electrode lead 221 is connected to the electrode component 25 and has a bent structure.

[0112] The opening 2121 being located on the side of the housing 21 with the largest surface area means that the plane where the opening 2121 is located is the plane with the largest area on the outer surface of the housing 21. The area of ​​the plane where the opening 2121 is located on the outer surface of the housing 21 is the same as the surface area of ​​the surface of the top cover 24 away from the housing 21. The electrode lead 221 is conductive. The electrode component 25 can be integrally provided with the housing 21. The electrode component 25 can also be provided separately from the housing 21 and connected to the housing 21. The bending angle of the electrode lead 221 includes, but is not limited to, 90°, 180°, etc.

[0113] Through the above method, the bare cell 22 can be installed into the housing 21 through the opening 2121 located on the side of the housing 21 with the largest area, and effectively connects with the electrode assembly 25 located on the housing 21, allowing for efficient assembly of the battery cell 20. Furthermore, the bent structure of the electrode lead-out member 221 makes the electrode lead-out member 221 more compact, taking up less space, and facilitating the reduction of the gap between the bare cell 22 and the housing 21, thereby increasing the energy density per unit volume of the battery cell 20.

[0114] According to some embodiments of the present application, the electrode lead-out member 221 includes a tab 2211 , which is disposed on one side of the bare cell 22 . The tab 2211 connects the bare cell 22 and the electrode component 25 , and the tab 2211 is a bent structure.

[0115] Through the above method, the bare cell 22 can be conveniently connected to the electrode component 25 through the tab 2211 to form a current loop.

[0116] Please refer to Figures 7 to 9. Figure 7 is a schematic diagram of a second structure of a battery cell according to one or more embodiments; Figure 8 is a schematic cross-sectional view of section BB in Figure 7; and Figure 9 is a schematic cross-sectional view of section CC in Figure 7. According to some embodiments of the present application, the electrode lead 221 further includes a tab 2211 and a connecting piece 2212. The tab 2211 is disposed on one side of the bare cell 22. One end of the connecting piece 2212 is connected to the tab 2211, and the other end of the connecting piece 2212 is connected to the electrode component 25. The tab 2211 and / or the connecting piece 2212 are bent structures.

[0117] Specifically, the connecting piece 2212 is made of a conductive material. The shape of the connecting piece 2212 can be customized based on actual needs. For example, the connecting piece 2212 can be thin. The bending of the tab 2211 and / or the connecting piece 2212 can be customized based on actual needs. For example, in one embodiment, the tab 2211 has a bent structure. In another embodiment, the connecting piece 2212 has a bent structure. In yet another embodiment, both the tab 2211 and the connecting piece 2212 have a bent structure.

[0118] Through the above method, the tab 2211 does not need to be directly connected to the electrode component 25, the connection method of the tab 2211 is more diverse, and the installation of the battery cell 20 is more flexible.

[0119] In some embodiments, the connecting piece 2212 includes a first connecting portion 2212a connected to the electrode tab 2211 and a second connecting portion 2212b connected to the electrode component 25. The first connecting portion 2212a is bent relative to the second connecting portion 2212b, and the electrode tab 2211 extends between the first connecting portion 2212a and the second connecting portion 2212b.

[0120] Specifically, a gap is formed between the first connecting portion 2212a and the second connecting portion 2212b. The tab 2211 at least partially extends into the gap. The first connecting portion 2212a and the second connecting portion 2212b can be integrally formed or separately formed.

[0121] Through the above method, the tab 2211 can be at least partially located in the gap between the first connecting portion 2212a and the second connecting portion 2212b, formed by the bending of the first connecting portion 2212a. The tab 2211 and the connecting piece 2212 are compact in structure, occupying less of the accommodating space 212. The bare cell 22 can occupy a higher volume of the accommodating space 212, which is beneficial for improving the energy density of the battery cell 20.

[0122] According to some embodiments of the present application, the tab 2211 is connected to a side of the first connection portion 2212 a facing the bare cell 22 .

[0123] Through the above method, the connection position of the tab 2211 is flexible and the battery cell 20 is easy to assemble.

[0124] According to some embodiments of the present application, the connecting piece 2212 includes a first connecting piece 2212c and a second connecting piece 2212d, one end of the first connecting piece 2212c is connected to the pole ear 2211, and the other end is connected to the second connecting piece 2212d, one end of the second connecting piece 2212d is connected to the first connecting piece 2212c, and the other end is connected to the electrode component 25, and at least one of the pole ear 2211, the first connecting piece 2212c, and the second connecting piece 2212d is a bent structure.

[0125] Specifically, the shapes of the first connecting piece 2212c and the second connecting piece 2212d can be configured according to actual circumstances. For example, the first connecting piece 2212c is thin-sheet-shaped, and the second connecting piece 2212d is thin-sheet-shaped. The bending of the tab 2211, the first connecting piece 2212c, and the second connecting piece 2212d can be configured according to actual circumstances. For example, in one embodiment, the tab 2211 has a bent structure. In another embodiment, the tab 2211 and the first connecting piece 2212c have a bent structure. In yet another embodiment, the first connecting piece 2212c and the second connecting piece 2212d have a bent structure.

[0126] Through the above method, the first connecting piece 2212c and the second connecting piece 2212d make the connection between the tab 2211 and the electrode component 25 more diverse, and the battery cell 20 is more flexible to install.

[0127] According to some embodiments of the present application, the housing 21 includes a bottom plate 213 and a plurality of side plates 214. The side plates 214 extend along the periphery of the bottom plate 213 and together with the bottom plate 213 form a receiving space 212. An electrode component 25 is disposed on at least one side plate 214.

[0128] The bottom plate 213 is the second largest side surface of the shell 21. The bottom plate 213 can be arranged opposite to the opening 2121. The side plate 214 can be arranged at a certain angle to the bottom plate 213, for example, it can be arranged at 90 degrees. The number of side plates 214 can be set according to actual conditions. For example, in this embodiment, the number of side plates 214 is four. The accommodating space 212 is used to accommodate the bare battery cell 22. The electrode component 25 can be arranged on one side plate 214 or on multiple side plates 214.

[0129] By the above method, the housing 21 can well accommodate the bare cell 22. At the same time, the electrode component 25 is arranged on the side plate 214, which is more conducive to the connection between the electrode component 25 and the tab 2211, and the structure of the battery cell 20 is simplified.

[0130] In one embodiment, the bending angle U of the tab 2211 is 90 degrees to 180 degrees.

[0131] For example, 90 degrees, 95 degrees, 100 degrees, 110 degrees, 120 degrees, 130 degrees, 140 degrees, 150 degrees, 160 degrees, 170 degrees, and 180 degrees.

[0132] Through the above method, the tab 2211 occupies less space and has a more compact structure, which helps reduce the gap between the bare cell 22 and the side plate 214 provided with the electrode assembly 25, making the bare cell 22 less likely to shake. At the same time, the bare cell 22 can have a larger volume, which helps increase the amount of energy that can be stored per unit volume of the battery cell 20.

[0133] According to some embodiments of the present application, the distance L1 between the bare cell 22 and the side plate 214 of the housing 21 where no electrode component 25 is provided is 0.5 mm to 2 mm, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, or 2 mm.

[0134] Through this method, a smaller gap can be created between the bare cell 22 and the side plate 214 without the electrode assembly 25. The bare cell 22 is further confined within the accommodating space 212, making it less likely for the bare cell 22 to shake, thereby improving the stability of the battery cell 20. Furthermore, the bare cell 22 occupies a larger volume within the battery cell 20, which helps increase the amount of energy that can be stored per unit volume of the battery cell 20.

[0135] Referring to Figures 10 and 11 , Figure 10 is a schematic diagram of a third structure of a battery cell according to one or more embodiments; Figure 11 is an enlarged schematic diagram of D in Figure 10 . In conjunction with Figures 1 to 9 , according to some embodiments of the present application, a support plate 23 is disposed between the bare cell 22 and the side plate 214 of the housing 21 where the electrode component 25 is not disposed.

[0136] The number and placement of the support plates 23 can be set according to actual conditions. For example, in one embodiment, one support plate 23 is placed between the bare cell 22 and the side plate 214 in the shell 21 that is opposite to the side plate 214 on which the electrode component 25 is provided. For example, in another embodiment, one support plate 23 is placed between the bare cell 22 and the side plate 214 in the shell 21 that is adjacent to the side plate 214 on which the electrode component 25 is provided. For example, in another embodiment, one support plate 23 is placed between the bare cell 22 and the side plate 214 in the shell 21 that is opposite to the side plate 214 on which the electrode component 25 is provided, and another support plate 23 is placed between the bare cell 22 and the side plate 214 in the shell 21 that is adjacent to the side plate 214 on which the electrode component 25 is provided.

[0137] The support plate 23 can be made of resin or metal. Using resin for the support plate 23 improves its cushioning properties, preventing the bare cells 22 from being damaged by collisions with the support plate 23. Using metal for the support plate 23 enhances its position-limiting capabilities, effectively limiting the movement of the bare cells 22.

[0138] Through the above method, the support plate 23 can fill the gap between the bare battery cell 22 and the side plate 214 of the shell 21, thereby reducing the shaking of the bare battery cell 22 in the shell 21 and making the installation of the bare battery cell 22 more stable.

[0139] According to some embodiments of the present application, the support plate 23 includes a bottom support plate 231. The bottom support plate 231 is disposed between the bare cell 22 and a side plate 214 of the housing 21 that is disposed opposite to the side plate 214 on which the electrode component 25 is disposed.

[0140] The thickness of the bottom support plate 231 may be less than or equal to the gap between the bare battery cell 22 and the side plate 214 opposite to the side plate 214 on which the electrode component 25 is provided.

[0141] Through the above method, the bottom support plate 231 can fill the gap between the bare battery cell 22 and the side plate 214 in the shell 21 which is arranged opposite to the side plate 214 on which the electrode component 25 is provided, which is beneficial to reduce the shaking of the bare battery cell 22 in the shell 21 and make the installation of the bare battery cell 22 more stable.

[0142] According to some embodiments of the present application, the support plate 23 includes a side support plate 232 , which is disposed between the bare cell 22 and a side plate 214 in the shell 21 adjacent to the side plate 214 on which the electrode component 25 is disposed.

[0143] The thickness of the side support plate 232 may be less than or equal to the gap between the bare cell 22 and the side plate 214 adjacent to the side plate 214 on which the electrode component 25 is disposed in the housing 21 .

[0144] Through the above method, the side support plate 232 can fill the gap between the bare battery cell 22 and the side plate 214 in the shell 21 adjacent to the side plate 214 on which the electrode component 25 is provided, which is beneficial to reduce the shaking of the bare battery cell 22 in the shell 21 and make the installation of the bare battery cell 22 more stable.

[0145] Continuing with Figures 1 to 11 , according to some embodiments of the present application, the thickness L2 of the support plate 23 is less than or equal to the distance L1 between the bare battery cell 22 and the side plate 214 of the housing 21 where the electrode component 25 is not provided. The thickness L2 of the support plate 23 can be 0.1 mm to 1.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, or 1.5 mm.

[0146] Through the above method, the support plate 23 can effectively fill the gap between the bare cell 22 and the side plate 214 of the housing 21 without the electrode component 25. At the same time, the smaller thickness of the support plate 23 facilitates the installation of the support plate 23 between the bare cell 22 and the side plate 214 of the housing 21 without the electrode component 25, thereby improving the organizational efficiency of the battery cell 20.

[0147] Please refer to Figures 12 to 15. Figure 12 is a fourth structural schematic diagram of a battery cell according to one or more embodiments; Figure 13 is an enlarged schematic diagram of E in Figure 12; Figure 14 is a fifth structural schematic diagram of a battery cell according to one or more embodiments; and Figure 15 is a cross-sectional view of a battery cell according to one or more embodiments. According to some embodiments of the present application, the housing 21 includes a bottom plate 213 and a plurality of side plates 214. The side plates 214 extend along the periphery of the bottom plate 213 and together with the bottom plate 213 form a receiving space 212. A flange edge 2141 is connected to the side of the side plate 214 away from the bottom plate 213. The flange edge 2141 extends from the end of the side plate 214 away from the bottom plate 213 to the outside of the receiving space 212. The top cover 24 is connected to the flange edge 2141.

[0148] Specifically, the housing 21 may include a bottom plate 213 and four side plates 214. A flange 2141 is connected to the side of the side plate 214 away from the bottom plate 213. The flange 2141 and the side plate 214 may be separate components. Alternatively, the flange 2141 and the side plate 214 may be integrally formed. The flange 2141 extends from one end of the side plate 214 away from the bottom plate 213 and extends outwardly toward the accommodating space 212, such that the flange 2141 is located on the outer periphery of the side plate 214.

[0149] The shape of the flange 2141 can match the shape of the top cover 24. For example, when the top cover 24 is flat, the flange 2141 can be configured as a flat plate parallel to the top cover 24. The top cover 24 can be connected to the end of the flange 2141 away from the housing 21.

[0150] In the above manner, the top cover 24 is connected to the flange edge 2141 of the shell 21. By setting the connection position at the flange edge 2141, the distance between the connection position of the top cover 24 and the flange edge 2141 and the bare cell 22 can be increased, thereby avoiding damage to the bare cell 22 due to light leakage during the connection process of the top cover 24 and the flange edge 2141; in addition, it can also reduce the damage to the bare cell 22 caused by particulate matter falling into the bare cell 22, thereby protecting the bare cell 22 and improving the reliability and safety of the battery cell 20.

[0151] According to some embodiments of the present application, the side panel 214 is connected to the bottom panel 213 via a first transition angle α, and the side panel 214 is connected to the flange edge 2141 via a second transition angle β.

[0152] Specifically, the side panel 214 and the bottom panel 213 are connected by a first transition angle α, so that the side panel 214 and the bottom panel 213 are arranged at a certain angle, thereby improving the stability and reliability of the shell 21. The size and shape of the accommodating space 212 will be different depending on the angle of the first transition angle α. The angle of the first transition angle α can be greater than 0 degrees and less than 180 degrees, such as the angle of the first transition angle α can be 30 degrees, 60 degrees, 90 degrees, 120 degrees, 138 degrees, etc. When the angle of the first transition angle α is 90 degrees, the side panel 214 is arranged perpendicular to the bottom panel 213. Among them, the size and shape of the accommodating space 212 and the angle of the first transition angle α are determined according to actual needs and are not limited here.

[0153] The side panel 214 is connected to the flange 2141 via a second transition angle β, so that the side panel 214 and the flange 2141 are arranged at a certain angle, improving the stability and reliability of the flange 2141, thereby improving the stability and reliability of the housing 21. The second transition angle β can also be greater than 0 degrees and less than 180 degrees, for example, the second transition angle β can be 30 degrees, 60 degrees, 90 degrees, 120 degrees, 138 degrees, etc. When the second transition angle β is 90 degrees, the side panel 214 is arranged perpendicular to the flange 2141. When the flange 2141 is arranged parallel to the bottom plate 213, the second transition angle β is the same as the first transition angle α.

[0154] Through the above method, the first transition angle α and the second transition angle β can improve the stability of the shell 21, thereby improving the stability of the top cover 24 connected to the flange edge 2141, and thus can electrically protect the bare battery cell 22.

[0155] According to some embodiments of the present application, the radius R of the second transition angle β is less than or equal to 0.2 mm. The radius R of the second transition angle β can be, but is not limited to, 0.091 mm, 0.1 mm, 0.15 mm, 0.17 mm, and 0.2 mm. This method can increase the stability of the connection between the side panel 214 and the flange edge 2141.

[0156] According to some embodiments of the present application, the side panels 214 are arranged around the bottom panel 213 , the flange edge 2141 is arranged around the side panels 214 , and the flange edge 2141 is connected to the top cover 24 .

[0157] Specifically, the side panels 214 surround the bottom panel 213 to form the accommodating space 212. When the housing 21 is rectangular, there are four side panels 214. When the housing 21 is cylindrical, there can be one side panel 214 arranged in a ring shape. When the housing 21 is hexagonal, there are six side panels 214. The number of side panels 214 can be determined based on the shape of the housing 21 and is not limited here.

[0158] Each side panel 214 is provided with a corresponding flange 2141. The flange 2141 varies with the number and shape of the side panels 214. When the shell 21 is a rectangular parallelepiped, the number of side panels 214 is four, and the number of flanges 2141 can be four. When the shell 21 is a cylindrical shape, the side panel 214 can be one and arranged in a ring shape, and the number of flanges 2141 can also be one and arranged in a ring shape. In some other embodiments, the shell 21 is not limited to the above-mentioned rectangular parallelepiped, cylindrical shape, etc., that is, the flange 2141 is not limited to the above-mentioned number and shape, etc. Of course, the number of flanges 2141 can also be different from the number of side panels 214, which is not limited here. The flange 2141 is parallel to the top cover 24, so that the top cover 24 and the flange 2141 are more tightly connected.

[0159] Through the above method, each side panel 214 is provided with a corresponding flange edge 2141, and the top cover 24 is connected to all the flange edges 2141, so that the connection positions are all located on the flange edges 2141, thereby improving the protection performance of the bare battery cell 22.

[0160] According to some embodiments of the present application, the edge of the top cover 24 is aligned with the edge of the flange edge 2141 away from the side panel 214 .

[0161] Specifically, after the top cover 24 is connected to the flange 2141 , the edge of the top cover 24 and the edge of the flange 2141 away from the side panel 214 need to be cut to prevent the edge of the top cover 24 and / or the flange 2141 from protruding away from the edge of the side panel 214 .

[0162] By adopting the above-mentioned method, the top cover 24 and / or the flange edge 2141 is prevented from puncturing adjacent battery cells 20 or the box body 10 in the battery 100, etc.; and the structure of the battery cell 20 itself can be made more compact, which is convenient for subsequent series or parallel connection of multiple battery cells 20.

[0163] According to some embodiments of the present application, the housing 21 is an integrally formed structure.

[0164] Specifically, the bottom plate 213 and the side plates 214 are integrally formed. When the number of side plates 214 is, but not limited to, four, the four side plates 214 are integrally formed with the bottom plate 213 and enclose the housing space 212. This arrangement further stabilizes the housing 21, thereby enhancing the stability of the flange 2141 connecting the top cover 24 to the housing 21.

[0165] Through the above-mentioned manner, the shell 21 is more stable, thereby improving the stability of the flange edge 2141 on the shell 21 connected to the top cover 24.

[0166] According to some embodiments of the present application, the maximum distance between the edge of the flange 2141 away from the side panel 214 and the outer surface of the side panel 214 is no more than 5 mm.

[0167] Specifically, to facilitate the connection of the top cover 24 to the flange 2141, the distance that the flange 2141 extends outward from the end of the side panel 214 away from the bottom panel 213 toward the accommodating space 212 is increased. This also increases the size of the top cover 24, thereby cooperating with the flange 2141. At the same time, the maximum distance that the flange 2141 extends outward is limited, thereby reducing material costs. Specifically, the distance that the flange 2141 extends outward from the end of the side panel 214 away from the bottom panel 213 toward the accommodating space 212 can be greater than 0 mm. The distance that the flange 2141 extends outward from the end of the side panel 214 away from the bottom panel 213 toward the accommodating space 212 can be less than or equal to 10 mm. The distance that the flange 2141 extends outward from the end of the side panel 214 away from the bottom panel 213 toward the accommodating space 212 is defined as L3, as shown in FIG13 . L3 can be but is not limited to 10 mm, 9 mm, 7 mm, 5.5 mm, 5 mm, 4 mm, 3.4 mm, 2 mm, 1 mm, etc.

[0168] After the top cover 24 is connected to the flange 2141, it is necessary to cut the edge of the top cover 24 and the edge of the flange 2141 away from the side panel 214, wherein the actual connection position W between the top cover 24 and the flange 2141 is avoided during the cutting process. Among them, the distance between the edge of the flange 2141 away from the side panel 214 and the outer surface of the side panel 214 is not greater than a predetermined threshold (not shown in the figure). That is, the cutting position is greater than or equal to the predetermined threshold position. The predetermined threshold can increase the distance between the connection position W and the bare cell 22, reducing the damage to the bare cell 22 caused by laser leakage; in addition, it can also reduce the damage to the bare cell 22 caused by particulate matter falling into the bare cell 22, thereby protecting the bare cell 22.

[0169] The predetermined threshold may be 5 mm. The distance between the edge of the flange 2141 away from the side plate 214 and the outer surface of the side plate 214 may be, but is not limited to, 1 mm, 2.1 mm, 3 mm, 3.7 mm, 4 mm, 5 mm, etc.

[0170] Through the above method, the distance between the actual connection position of the flange edge 2141 and the top cover 24 and the bare battery cell 22 is limited, thereby reducing damage to the bare battery cell 22 caused by laser leakage and falling particles.

[0171] According to some embodiments of the present application, an alignment groove is provided on one of the side of the flange edge 2141 facing the top cover 24 and the side of the top cover 24 facing the flange edge 2141, and an alignment portion is provided on the other, which is inserted into the alignment groove.

[0172] Specifically, an alignment groove is provided on the side of the flange 2141 facing the top cover 24. An alignment portion is provided on the side of the top cover 24 facing the flange 2141. When the top cover 24 is connected to the flange 2141, the alignment portion engages with the alignment groove, ensuring a tight fit between the top cover 24 and the flange 2141.

[0173] Alternatively, the side of the flange 2141 facing the top cover 24 is provided with an alignment portion. The side of the top cover 24 facing the flange 2141 is provided with an alignment groove. When the top cover 24 is connected to the flange 2141, the alignment portion engages with the alignment groove. At this point, the top cover 24 and the flange 2141 fit tightly together.

[0174] By the above method, the alignment portion and the alignment groove are plugged and aligned, and the top cover 24 can be quickly positioned on the flange edge 2141, thereby improving the efficiency of installing the top cover 24 to the shell 21, and further improving the installation efficiency of the battery cell 20.

[0175] According to some embodiments of the present application, the edge of the flange 2141 away from the side plate 214 is connected to the edge of the top cover 24 by welding.

[0176] Specifically, a welding position is formed between the edge of the flange 2141 away from the side panel 214 and the edge of the top cover 24, where the welding position is the aforementioned connection position W. The welding position is spaced a certain distance from the bare cell 22 to prevent damage to the bare cell 22 caused by the welding laser and particulate matter. This method is simple and easy to implement to achieve the welding fixation between the flange 2141 and the top cover 24.

[0177] By the above method, the flange edge 2141 and the top cover 24 are welded and fixed, which is simple and easy to implement.

[0178] According to some embodiments of the present application, a battery 100 is provided, comprising the battery cell 20 described in any of the above solutions. The battery 100 may be an energy storage device, for example. An energy storage device is a type of battery 100 that can be used as a power grid, or in household or commercial settings, to store and / or release electrical energy. The energy storage device may be an energy storage cabinet, an energy storage container, or the like.

[0179] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 described in any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0180] The power-consuming device may be a mobile phone, a computer, a car, or any of the aforementioned devices or systems using the battery 100 .

[0181] Please refer to Figures 16 to 18. Figure 16 is a schematic diagram of a process according to one or more embodiments; Figure 17 is another schematic diagram of a process according to one or more embodiments; and Figure 18 is another schematic diagram of a process according to one or more embodiments. According to some embodiments of the present application, an embodiment of the present application provides a method for manufacturing a battery cell 20. The method for manufacturing a battery cell 20 includes:

[0182] S110 : Connecting the electrode lead-out piece 221 of the bare cell 22 to the electrode component 25 .

[0183] S120 : bending the connected electrode lead-out piece 221 so that the bare cell 22 enters the accommodating space 212 of the shell 21 through the opening 2121 of the shell 21 . The opening 2121 of the shell 21 is the side surface of the shell 21 with the largest area.

[0184] S130 : Connect the top cover 24 to the housing 21 to close the opening 2121 .

[0185] Specifically, the electrode component 25 is provided in the shell 21 and may be at least partially located in the accommodating space 212 of the shell 21. The electrode component 25 may be used to electrically connect to the bare cell 22 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the electrode component 25 may include a positive electrode component 25 and a negative electrode component 25 for outputting current and connecting to an external circuit. The method of connecting the electrode lead 221 to the electrode component 25 may include laser welding, friction welding, ultrasonic welding, etc. The electrode component 25 may include a pole, etc. The electrode lead 221 may include a tab 2211, a transition piece, etc.

[0186] The electrode lead-out piece 221 of the bare cell 22 can be located on one side of the shell 21 and outside the accommodating space 212 before connection. After the electrode lead-out piece 221 is connected to the electrode component 25, the electrode lead-out piece 221 can be bent around the position between the bare cell 22 and the electrode component 25. The bending direction of the tab 2211 and / or the electrode component 25 is along the direction close to the accommodating space 212. The end of the tab 2211 connected to the bare cell 22 drives the bare cell 22 to move around the bending position. After the tab 2211 and / or the electrode component 25 are bent, the bare cell 22 enters the accommodating space 212 of the shell 21.

[0187] Opening 2121 can be located on the side of housing 21 with the largest area. Top cover 24 can be closed to seal opening 2121. Connection methods for top cover 24 and housing 21 may include laser welding, tungsten inert gas welding, etc. When top cover 24 seals opening 2121, accommodating space 212 is isolated from the external environment.

[0188] Through the above method, the bare cell 22 can form a stable electrical connection with the electrode assembly 25, and can be directly installed into the accommodating space 212 of the housing 21 by bending the electrode lead 221. The bare cell 22 can be easily installed with the electrode assembly 25 provided in the housing 21, and the battery cell 20 can be efficiently assembled.

[0189] According to some embodiments of the present application, the shell 21 includes a bottom plate 213 and multiple side plates 214. The side plates 214 extend along the periphery of the bottom plate 213 and together with the bottom plate 213 form a accommodating space 212. The opening 2121 is arranged opposite to the bottom plate 213. The electrode component 25 is the bottom plate 213 or the side plate 214 of the shell 21.

[0190] Specifically, when the electrode component 25 is the bottom plate 213 or the side plate 214 of the housing 21, the tab 2211 is connected to the bottom plate 213 or the side plate 214. The side plate 214 can be arranged at a certain angle to the bottom plate 213, for example, at a 90-degree angle. The number of side plates 214 can be set according to actual conditions. For example, in this embodiment, the number of side plates 214 is four. The accommodation space 212 is used to accommodate the bare battery cell 22.

[0191] Through this method, the tabs 2211 are directly connected to the bottom plate 213 or the side plate 214, resulting in a simple connection structure and easy production. This also helps reduce the structure between the bare cell 22 and the housing 21, increasing the volume of the bare cell 22 within the housing space 212 and thereby enhancing the energy density of the battery cell 20.

[0192] According to some embodiments of the present application, the housing 21 includes a bottom plate 213 and a plurality of side plates 214. The side plates 214 extend along the periphery of the bottom plate 213 and together with the bottom plate 213 form a receiving space 212. The opening 2121 is disposed opposite the bottom plate 213, and the electrode component 25 is disposed on at least one of the side plates 214.

[0193] Specifically, the bottom plate 213 is the side surface of the housing 21 with the largest area. The side plates 214 can be arranged at a certain angle to the bottom plate 213, for example, at a 90-degree angle. The number of side plates 214 can be set according to actual conditions. For example, in this embodiment, there are four side plates 214. The accommodation space 212 is used to accommodate the bare battery cells 22.

[0194] By adopting the above method, the electrode component 25 is arranged on the side plate 214 , which is more conducive to the connection between the electrode component 25 and the tab 2211 , and the structure of the battery cell 20 is simplified.

[0195] According to some embodiments of the present application, the electrode lead-out member 221 includes a tab 2211 , and the step of connecting the electrode lead-out member 221 of the bare cell 22 to the electrode component 25 includes:

[0196] S210 : welding the tab 2211 of the bare cell 22 to the electrode component 25 .

[0197] Through the above method, the bare cell 22 can conveniently connect the tab 2211 to the electrode component 25 to form a current loop.

[0198] According to some embodiments of the present application, the electrode lead-out member 221 includes a tab 2211 and a connecting piece 2212 . The steps of connecting the electrode lead-out member 221 of the bare cell 22 to the electrode component 25 include:

[0199] S311: Welding the tab 2211 of the bare cell 22 to the connecting piece 2212;

[0200] S312 : Welding the connecting piece 2212 to the electrode component 25 .

[0201] Specifically, the connecting piece 2212 is made of a conductive material. One end of the connecting piece 2212 can be welded to the tab 2211 first, and then the other end can be welded to the electrode component 25. Alternatively, one end of the connecting piece 2212 can be welded to the electrode component 25 first, and then the other end can be welded to the tab 2211. In other words, the order of S311 and S312 can be reversed. The shape of the connecting piece 2212 can be set according to actual conditions. For example, the connecting piece 2212 can be thin and easy to bend.

[0202] By using the above method, the tab 2211 does not need to be directly connected to the electrode component 25. The tab 2211 can be more flexibly connected to the electrode component 25, and the battery cell 20 can be installed flexibly. At the same time, the connecting piece 2212 can share the tension between the tab 2211 and the electrode component 25, making the tab 2211 less likely to break.

[0203] Please refer to Figure 19, which is another schematic diagram of another process according to one or more embodiments. In conjunction with Figures 1 to 18, according to some embodiments of the present application, the electrode lead 221 includes a tab 2211, a first connecting piece 2212c, and a second connecting piece 2212d. The steps of connecting the electrode lead 221 of the bare cell 22 to the electrode component 25 include:

[0204] S411: Welding the tab 2211 of the bare cell 22 to the first connecting piece 2212c;

[0205] S412: Welding the first connecting piece 2212c and the second connecting piece 2212d;

[0206] S413 : Welding the second connecting piece 2212 d to the electrode component 25 .

[0207] Specifically, the first connecting piece 2212c is made of a conductive material. The second connecting piece 2212d is made of a conductive material. The connection order between the tab 2211, the first connecting piece 2212c, the second connecting piece 2212d, and the electrode component 25 can be adjusted according to actual conditions. For example, in a specific embodiment, the tab 2211 is first welded to one end of the first connecting piece 2212c. After the tab 2211 is welded to one end of the first connecting piece 2212c, the other end of the first connecting piece 2212c is welded to one end of the second connecting piece 2212d. After the one end of the second connecting piece 2212d is welded to the other end of the first connecting piece 2212c, the second connecting piece 2212d is welded to the electrode component 25. In other words, the execution order of S411, S412, and S413 can be swapped. They can be executed in the order of S411, S412, and S413, or in the order of S412, S411, and S413, or in the order of S413, S411, and S412. Other execution orders include: S411, S413, and S412; S412, S413, and S411; S413, S412, and S411. Alternatively, S411 and S413 can be executed simultaneously, followed by S412.

[0208] In another specific embodiment, the electrode component 25 is first welded to one end of the second connecting piece 2212d. After the second connecting piece 2212d is welded to the electrode component 25, the other end of the second connecting piece 2212d is welded to one end of the first connecting piece 2212c. After the other end of the second connecting piece 2212d is welded to one end of the first connecting piece 2212c, the other end of the first connecting piece 2212c is welded to the tab 2211.

[0209] As in another embodiment, one end of the first connecting piece 2212c is first welded to one end of the second connecting piece 2212d. After the welding of one end of the first connecting piece 2212c to one end of the second connecting piece 2212d is completed, the other end of the first connecting piece 2212c is welded to the electrode tab 2211. After the welding of the other end of the first connecting piece 2212c to the electrode tab 2211, the other end of the second connecting piece 2212d is welded to the electrode component 25.

[0210] The shapes of the first connecting piece 2212c and the second connecting piece 2212d can be set according to actual conditions. For example, the first connecting piece 2212c can be in the shape of a thin sheet to facilitate bending. The second connecting piece 2212d can be in the shape of a thin sheet to facilitate bending.

[0211] Through the above method, the tab 2211 is connected to the electrode component 25 via the first connecting piece 2212c and the second connecting piece 2212d. The first connecting piece 2212c and the second connecting piece 2212d can better share the tensile force between the tab 2211 and the electrode component 25, making the tab 2211 less likely to break. Furthermore, the connection between the tab 2211 and the electrode component 25 can be split into multiple steps, making the installation of the battery cell 20 more flexible.

[0212] According to some embodiments of the present application, the housing 21 includes a bottom plate 213, and the opening 2121 is arranged opposite to the bottom plate 213. Before the step of connecting the electrode lead 221 of the bare cell 22 to the electrode component 25, the following steps are further included:

[0213] S402 : A preset angle P is formed between the bare cell 22 and the bottom plate 213 .

[0214] Specifically, the preset angle P refers to the angle between the side surface of the bare cell 22 with the largest area and the bottom plate 213 .

[0215] Through the above method, the preset angle P provides a good welding posture for the bare cell 22 and the electrode component 25, thereby improving the welding quality between the bare cell 22 and the electrode component 25. Furthermore, the preset angle P places the bare cell 22 in a more convenient bending position, thereby improving the efficiency of installing the bare cell 22 into the accommodating space 212.

[0216] According to some embodiments of the present application, before the step of connecting the tab 2211 of the bare battery cell 22 to the electrode component 25, the tab 2211 of the bare battery cell 22 can also be aligned with the electrode component 25 so that the tab 2211 of the bare battery cell 22 is in a position where it can be connected to the electrode component 25.

[0217] Through the above method, the connection between the tab 2211 and the electrode component 25 is more convenient, which is conducive to improving the connection quality.

[0218] According to some embodiments of the present application, the preset angle P is not less than 45 degrees and not greater than 135 degrees, for example, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 70 degrees, 75 degrees, 85 degrees, 90 degrees, 100 degrees, 120 degrees, 130 degrees, or 135 degrees.

[0219] Through the above method, the bare battery cell 22 and the electrode component 25 can be welded with a better welding posture, the welding heat input is more uniform, the base material is fused more fully, the probability of cold welding is reduced, and the weld quality is better.

[0220] According to some embodiments of the present application, in the step of connecting the electrode lead-out piece 221 of the bare cell 22 to the electrode component 25 , the bare cell 22 is perpendicular to the bottom plate 213 .

[0221] The bare cell 22 being perpendicular to the bottom plate 213 means that the angle between the side surface of the bare cell 22 with the largest area and the bottom plate 213 is 90 degrees.

[0222] Through the above method, the contact area between the bare battery cell 22 and the electrode component 25 is larger, the welding posture is good, the welding heat input is more uniform, the base material is more fully fused, and the weld quality is better.

[0223] According to some embodiments of the present application, before the step of welding the top cover 24 to the housing 21 to close the opening 2121, the following steps are further included:

[0224] S330 : placing a support plate 23 between the housing 21 and at least one side of the bare cell 22 where the electrode lead-out member 221 is not provided.

[0225] The number and placement of the support plates 23 can be set according to actual conditions. For example, in one embodiment, one support plate 23 is placed between the shell 21 and the side of the bare cell 22 opposite to the side where the tab 2211 is provided. For example, in another embodiment, one support plate 23 is placed between the shell 21 and the side of the bare cell 22 adjacent to the side where the tab 2211 is provided. For example, in another embodiment, one support plate 23 is placed between the shell 21 and the side of the bare cell 22 opposite to the side where the tab 2211 is provided, and another support plate 23 is placed between the shell 21 and the side of the bare cell 22 adjacent to the side where the tab 2211 is provided.

[0226] The support plate 23 can be made of materials such as plastic, resin, and metal. Plastic materials such as polypropylene and polyethylene can be used. Using a resin plastic material for the support plate 23 improves its cushioning properties, preventing the bare cells 22 from being damaged by collisions with the support plate 23. Using a metal material for the support plate 23 enhances its position-limiting capability, effectively limiting the movement of the bare cells 22.

[0227] Through the above method, the support plate 23 can fill the gap between the bare battery cell 22 and the side plate 214 of the shell 21, thereby reducing the shaking of the bare battery cell 22 in the shell 21 and making the installation of the bare battery cell 22 more stable.

[0228] According to some embodiments of the present application, a flange 2141 is provided on a side of the housing 21 facing the top cover 24. The flange 2141 extends away from the accommodating space 212. The step of connecting the top cover 24 to the housing 21 to close the opening 2121 includes:

[0229] S340 : Cover the opening 2121 with the top cover 24 , and weld the top cover 24 to the flange 2141 .

[0230] Specifically, the housing 21 may include a bottom plate 213 and four side plates 214. A flange 2141 is connected to the side of the side plate 214 away from the bottom plate 213. The flange 2141 and the side plate 214 may be separate components. Alternatively, the flange 2141 and the side plate 214 may be integrally formed. The flange 2141 extends from one end of the side plate 214 away from the bottom plate 213 and extends outwardly toward the accommodating space 212, such that the flange 2141 is located on the outer periphery of the side plate 214.

[0231] The shape of the flange 2141 can match the shape of the top cover 24. For example, when the top cover 24 is flat, the flange 2141 can be configured as a flat plate parallel to the top cover 24. The top cover 24 can be connected to the end of the flange 2141 away from the housing 21.

[0232] Through the above method, the distance between the connection position of the top cover 24 and the flange edge 2141 and the battery cell is increased, which is beneficial to reduce the probability of battery cell damage caused by light leakage during the connection process of the top cover 24 and the flange edge 2141; in addition, it can also reduce the damage to the battery cell caused by particulate matter falling into the battery cell, thereby protecting the battery cell and improving the reliability and safety of the battery cell 20.

[0233] According to some embodiments of the present application, after the steps of covering the opening 2121 with the top cover 24 and welding the top cover 24 to the flange 2141 , the following steps are further included:

[0234] S350 : cutting the welded flange 2141 and the top cover 24 , removing the edge of the flange 2141 away from the accommodating space 212 , and removing the edge of the top cover 24 .

[0235] Specifically, the edge of the flange 2141 away from the accommodating space 212 refers to the portion between the position where the flange 2141 is welded to the top cover 24 and the edge of the end of the flange 2141 away from the accommodating space 212. When removing the edge of the flange 2141 away from the accommodating space 212, the above portion can be removed in its entirety or in part.

[0236] The edge of the top cover 24 refers to the portion between the position where the top cover 24 is welded to the flange 2141 and the edge of one end of the top cover 24 away from the accommodating space 212. When removing the edge of the top cover 24, the above portion can be removed entirely or partially.

[0237] By adopting the above-mentioned method, the space occupied by the flange edge 2141 and the top cover 24 can be reduced, thereby reducing the space occupied by the battery cell 20 .

[0238] According to some embodiments of the present application, before the step of welding the tab 2211 of the bare battery cell 22 to the electrode component 25, the following steps are further included:

[0239] S401: Wrapping the outer surface of the bare cell 22 with an insulating film (not shown in the figure).

[0240] Specifically, the insulating film is made of a material with insulating properties. The insulating film is similar to plastic paper. The insulating film can completely wrap around the outer surface of the bare cell 22. The insulating film can also partially wrap around the outer surface of the bare cell 22. For example, the insulating film wraps around the side surface of the bare cell 22 other than the side surface where the tab 2211 is provided.

[0241] Through the above method, the outer surface of the bare battery cell 22 has better insulation performance. At the same time, the insulating film protects the outer surface of the bare battery cell 22, reducing the probability of the bare battery cell 22 being bumped and scratched when it is installed in the shell 21.

[0242] Finally, according to some embodiments of the present application, the manufacturing method of the battery cell 20 includes: connecting the electrode lead-out piece 221 of the bare cell 22 to the electrode component 25. The electrode lead-out piece 221 after the connection is completed is bent so that the bare cell 22 enters the accommodating space 212 of the shell 21 through the opening 2121. The opening 2121 of the shell 21 is the side of the shell 21 with the largest area. The top cover 24 is welded to the shell 21 to close the opening 2121. Through the above method, the bare cell 22 can form a stable electrical connection with the electrode component 25, and can be directly installed in the accommodating space 212 of the shell 21 by bending the electrode lead-out piece 221. The bare cell 22 can be simply installed with the electrode component 25 provided in the shell 21, and the battery cell 20 can be efficiently assembled.

[0243] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell includes a bare cell, a top cover and a shell, the shell has an opening, the shell is connected to the top cover, the top cover covers the opening and forms an accommodation space with the shell, the bare cell is arranged in the accommodation space, the opening is located on the side of the shell with the largest area, an electrode lead-out piece is arranged on one side of the bare cell, the shell includes an electrode component or the shell is connected to an electrode component, the electrode lead-out piece is connected to the electrode component, and the electrode lead-out piece is a bent structure.

2. The battery cell according to claim 1, characterized in that: The electrode lead-out member includes a pole ear, which is arranged on one side of the bare battery cell, the pole ear connects the bare battery cell and the electrode component, and the pole ear is a bent structure.

3. The battery cell according to claim 1, characterized in that: The electrode lead-out member includes a pole ear and a connecting sheet, wherein the pole ear is arranged on one side of the bare battery cell, one end of the connecting sheet is connected to the pole ear, and the other end of the connecting sheet is connected to the electrode component, and the pole ear and / or the connecting sheet are bent structures.

4. The battery cell according to claim 3, characterized in that: The connecting piece includes a first connecting portion connected to the electrode tab and a second connecting portion connected to the electrode component. The first connecting portion is bent relative to the second connecting portion, and the electrode tab extends between the first connecting portion and the second connecting portion.

5. The battery cell according to claim 3, characterized in that: The connecting piece includes a first connecting piece and a second connecting piece, one end of the first connecting piece is connected to the electrode ear, and the other end is connected to the second connecting piece, one end of the second connecting piece is connected to the first connecting piece, and the other end is connected to the electrode component, and at least one of the electrode ear, the first connecting piece, and the second connecting piece is a bent structure.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The shell includes a bottom plate and a plurality of side plates, wherein the side plates extend along the periphery of the bottom plate and together with the bottom plate form the accommodating space, and the electrode component is disposed on at least one of the side plates.

7. The battery cell according to claim 6, characterized in that: The distance between the bare battery cell and the side plate of the shell where the electrode component is not provided is 0.5 mm-2 mm.

8. The battery cell according to claim 6 or 7, characterized in that: A support plate is arranged between the bare battery core and the side plate of the shell where the electrode component is not arranged.

9. The battery cell according to claim 8, characterized in that: The support plate includes a bottom support plate, and the bottom support plate is arranged between the bare battery cell and the side plate in the shell that is arranged opposite to the side plate where the electrode component is arranged.

10. The battery cell according to claim 8 or 9, characterized in that: The support plate includes a side support plate, and the side support plate is arranged between the bare battery cell and the side plate in the shell adjacent to the side plate on which the electrode component is arranged.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The shell includes a bottom plate and a plurality of side plates, wherein the side plates extend along the periphery of the bottom plate and together with the bottom plate form the accommodating space, a flange edge is connected to a side of the side plate away from the bottom plate, the flange edge extends from an end of the side plate away from the bottom plate to the outside of the accommodating space, and the top cover is connected to the flange edge.

12. The battery cell according to claim 11, characterized in that: The side plate is connected to the bottom plate via a first transition angle, and the side plate is connected to the flange edge via a second transition angle.

13. The battery cell according to claim 12, characterized in that: The radius of the second transition angle is less than or equal to 0.2 mm.

14. The battery cell according to any one of claims 11 to 13, characterized in that: The side plate is arranged around the bottom plate, the flange edge is arranged around the side plate, and the flange edge is connected to the top cover.

15. The battery cell according to any one of claims 11 to 14, characterized in that: The edge of the top cover is aligned with the edge of the flange away from the side plate.

16. The battery cell according to any one of claims 11 to 15, characterized in that: The shell is an integrally formed structure.

17. The battery cell according to any one of claims 11 to 16, characterized in that: The maximum distance between the edge of the flange away from the side plate and the outer surface of the side plate is no more than 5 mm.

18. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that: The electrical device comprises the battery according to claim 18, and the battery is used to supply power to the electrical device.

20. A method for manufacturing a battery cell, characterized in that: The method comprises: Connecting the electrode lead-out piece of the bare cell to the electrode component; The electrode lead-out piece after connection is bent so that the bare cell enters the accommodation space of the shell through the opening of the shell, and the opening of the shell is the side surface of the shell with the largest area; A top cover is connected to the housing to close the opening.

21. The method for manufacturing a battery cell according to claim 20, characterized in that: The shell includes a bottom plate and a plurality of side plates, wherein the side plates extend along the periphery of the bottom plate and together with the bottom plate form the accommodating space, the opening is arranged opposite to the bottom plate, and the electrode component is the bottom plate or the side plate of the shell.

22. The method for manufacturing a battery cell according to claim 20, characterized in that: The shell includes a bottom plate and a plurality of side plates, wherein the side plates extend along the periphery of the bottom plate and together with the bottom plate form the accommodating space, the opening is arranged opposite to the bottom plate, and the electrode component is arranged on at least one of the side plates.

23. The method for manufacturing a battery cell according to any one of claims 20 to 22, characterized in that: The electrode lead-out member includes a tab, and the step of connecting the electrode lead-out member of the bare cell to the electrode component includes: The tab of the bare cell is welded to the electrode component.

24. The method for manufacturing a battery cell according to any one of claims 20 to 22, characterized in that: The electrode lead-out member includes a tab and a connecting piece, and the step of connecting the electrode lead-out member of the bare cell to the electrode component includes: Welding the tab of the bare cell to the connecting sheet; The connecting piece is welded to the electrode component.

25. The method for manufacturing a battery cell according to any one of claims 20 to 24, characterized in that: The electrode lead-out member includes a tab, a first connecting piece, and a second connecting piece. The step of connecting the electrode lead-out member of the bare cell to the electrode component includes: Welding the tab of the bare cell to the first connecting piece; Welding the first connecting piece to the second connecting piece; The second connecting piece is welded to the electrode component.

26. The method for manufacturing a battery cell according to any one of claims 20 to 25, characterized in that: The housing includes a bottom plate, the opening is arranged opposite to the bottom plate, and before the step of connecting the electrode lead-out piece of the bare cell to the electrode component, the step further includes: A preset angle is formed between the bare battery core and the bottom plate.

27. The method for manufacturing a battery cell according to claim 26, characterized in that: The preset angle is not less than 45 degrees and not more than 135 degrees.

28. The method for manufacturing a battery cell according to claim 26 or 27, characterized in that: In the step of connecting the electrode lead-out piece of the bare cell to the electrode component, the bare cell is perpendicular to the bottom plate.

29. The method for manufacturing a battery cell according to any one of claims 20 to 28, characterized in that: Before the step of connecting the top cover to the shell to close the opening, the method further includes placing a support plate between the shell and at least one side of the bare cell where the electrode lead-out piece is not provided.

30. The method for manufacturing a battery cell according to any one of claims 20 to 29, characterized in that: The shell is provided with a flange edge on one side facing the top cover, and the flange edge extends in a direction away from the accommodating space. The step of connecting the top cover to the shell to close the opening includes: The top cover is used to cover the opening, and the top cover is welded to the flange.

31. The method for manufacturing a battery cell according to claim 30, characterized in that: After the step of covering the opening with the top cover and welding the top cover to the flange, the step further includes: The flange edge and the top cover that have been welded are cut to remove the edge of the flange edge away from the accommodating space and the edge of the top cover.

32. The method for manufacturing a battery cell according to any one of claims 20 to 31, characterized in that: Before the step of connecting the electrode lead-out piece of the bare cell to the electrode component, the step further includes: An insulating film is wrapped around the outer surface of the bare battery core.

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