Manufacturing method of battery cell, battery cell, battery and electrical device

Abstract

This application discloses a method for manufacturing a battery cell, a battery cell, a battery, and an electrical device. The method for manufacturing a battery cell includes: connecting the electrode leads of a bare cell to an electrode component; bending the connected electrode leads to allow the bare cell to enter the housing space through an opening, the opening being the side with the largest area of ​​the housing; and connecting a top cover to the housing to close the opening. In this application, the bare cell of the battery cell can be easily installed even when the electrode component is not located on the top cover.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a manufacturing method of a battery monomer, a battery monomer, a battery and an electric device. BACKGROUND

[0002] Due to the advantages of high energy density, high power density, multiple cycle times and long storage time, the rechargeable battery has been widely used in electric vehicles, mobile devices or electric tools. The existing battery monomer generally includes a bare cell, a shell, a top cover and an electrode component. The electrode component is arranged on the top cover. The cell is electrically connected with the electrode component when connected with the top cover, and is installed to the shell with the top cover. However, when the electrode component is not arranged on the top cover, the bare cell is not easy to install. SUMMARY

[0003] In view of the above problems, the present application provides a manufacturing method of a battery monomer, a battery monomer, a battery and an electric device, which can solve the problem that the cell of the battery monomer is not easy to install when the electrode component is not arranged on the top cover.

[0004] In a first aspect, the present application provides a battery monomer, which includes a bare cell, a top cover and a shell. The shell has an opening. The shell is connected with the top cover. The top cover covers the opening to form a containing space with the shell. The bare cell is arranged in the containing space. The opening is located at a side of the shell with the largest area. One side of the bare cell is provided with an electrode lead-out piece. The shell includes an electrode component or is connected with the electrode component. The electrode lead-out piece is connected with the electrode component. The electrode lead-out piece is a bent structure.

[0005] Through the above method, the bare cell can be loaded into the shell through the opening located at the side of the shell with the largest area, and is well connected with the electrode component located on the shell. The battery monomer can be efficiently assembled. At the same time, the electrode lead-out piece is a bent structure, which can make the structure of the electrode lead-out piece more compact and occupy less space, which is beneficial to reduce the gap between the bare cell and the shell and improve the energy density per unit volume of the battery monomer.

[0006] In some embodiments, the electrode lead-out piece includes a tab. The tab is arranged at one side of the bare cell. The tab is connected with the bare cell and the electrode component. The tab is a bent structure.

[0007] Through the above method, the bare cell can be connected with the electrode component through the tab and form a current loop.

[0008] In some embodiments, the electrode lead-out piece includes a tab and a connecting piece. The tab is arranged at one side of the bare cell. One end of the connecting piece is connected with the tab. The other end of the connecting piece is connected with the electrode component. The tab and / or the connecting piece is a bent structure.

[0009] By the above method, the tab of the bare battery cell does not have to be directly connected to the electrode component, the connection mode of the tab is more diverse, and the battery monomer is more flexible to install.

[0010] In some embodiments, the connecting piece includes a first connecting part connected with the tab and a second connecting part connected with the electrode component, the first connecting part is bent relative to the second connecting part, and the tab extends between the first connecting part and the second connecting part.

[0011] By the above method, the tab can be at least partially located in the gap between the first connecting part and the second connecting part formed by the bending of the first connecting part. The tab is compact with the connecting piece structure, can occupy less accommodation space, and the volume ratio of the bare battery cell in the accommodation space can be higher, which is beneficial to improve the energy density of the battery monomer.

[0012] 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 with the tab, the other end is connected with the second connecting piece, one end of the second connecting piece is connected with the first connecting piece, and the other end is connected with the electrode component. At least one of the tab, the first connecting piece and the second connecting piece is a bent structure.

[0013] By the above method, the first connecting piece and the second connecting piece make the connection mode between the tab and the electrode component more diverse, and the battery monomer is more flexible to install.

[0014] 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 form an accommodation space with the bottom plate, and at least one side plate is provided with an electrode component.

[0015] By the above method, the shell can well accommodate the bare battery cell. At the same time, the electrode component arranged on the side plate is more conducive to the connection between the electrode component and the tab, and the structure of the battery monomer is simplified. In some embodiments, the distance between the bare battery cell and the side plate of the shell without the electrode component is 0.5-2mm.

[0016] By the above method, the bare battery cell and the side plate without the electrode component can have a small gap, the bare battery cell is further limited in the accommodation space, the bare battery cell is more difficult to shake, and the stability of the battery monomer is improved. At the same time, the volume ratio of the bare battery cell in the battery monomer is larger, which is beneficial to improve the energy size that can be stored in a unit volume of the battery monomer.

[0017] In some embodiments, a supporting plate is arranged between the bare battery cell and the side plate of the shell without the electrode component.

[0018] By the above method, the supporting 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.

[0019] In some embodiments, the support plate includes a bottom support plate disposed between the bare battery cell and a side plate of the housing opposite to the side plate where the electrode component is disposed.

[0020] Through the above method, the bottom support plate can fill the gap between the bare battery cell and the side plate of the housing opposite to the side plate where the electrode component is disposed, which is conducive to reducing the shaking of the bare battery cell in the housing and making the installation of the bare battery cell more stable.

[0021] In some embodiments, the support plate includes a side support plate disposed between the bare battery cell and a side plate of the housing adjacent to the side plate where the electrode component is disposed.

[0022] Through the above method, the side support plate can fill the gap between the bare battery cell and the side plate of the housing adjacent to the side plate where the electrode component is disposed, which is conducive to reducing the shaking of the bare battery cell in the housing and making the installation of the bare battery cell more stable.

[0023] In some embodiments, the housing includes a bottom plate and a plurality of side plates extending along the periphery of the bottom plate to form a containing space together with the bottom plate, and a flange connected to the side plate away from the bottom plate, the flange extending outward from the end of the side plate away from the bottom plate to the containing space, and a top cover connected to the flange.

[0024] Through the above method, the top cover is connected to the flange of the housing, and by setting the connection position at the flange, the distance between the connection position of the top cover and the flange and the bare battery cell can be increased, avoiding damage to the bare battery cell caused by light leakage during the connection of the top cover and the flange. In addition, it can also reduce the damage to the bare battery cell caused by the falling of particulate matter into the bare battery cell, thereby protecting the bare battery cell and improving the reliability and safety of the battery monomer.

[0025] In some embodiments, the side plate and the bottom plate are connected through a first adapter corner, and the side plate and the flange are connected through a second adapter corner.

[0026] Through the above method, the first adapter corner and the second adapter corner can improve the stability of the housing, thereby improving the stability of the connection of the top cover to the flange, and thereby protecting the bare battery cell.

[0027] In some embodiments, the radius of the second adapter corner is less than or equal to 0.2 millimeters. Through the above method, the connection stability of the side plate and the flange is increased.

[0028] In some embodiments, the side plate is disposed around the bottom plate, and the flange is disposed around the side plate, and the flange is connected to the top cover.

[0029] Through the above method, each side plate is provided with a corresponding flange, and the top cover is connected to all the flanges, so that the connection position is located on the flange, improving the protection performance of the bare battery cell.

[0030] In some embodiments, the edge of the top cover is aligned with the edge of the flange away from the side plate.

[0031] The above methods prevent the top cover and / or flange edge from puncturing adjacent battery cells or the battery housing; they also make the battery cell structure more compact, facilitating the subsequent series or parallel connection of multiple battery cells.

[0032] In some embodiments, the housing is a one-piece molded structure.

[0033] The above method makes the shell more stable, thereby improving the stability of the top cover connected to the flange edge of the shell.

[0034] In some embodiments, 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.

[0035] The above method limits the distance between the actual connection point of the flange edge and the top cover and the bare battery cell, reducing damage to the bare battery cell caused by laser leakage and falling particulate matter.

[0036] Secondly, this application provides a battery, which includes the battery cells described in the above embodiments.

[0037] Thirdly, this application provides an electrical device that includes the battery described in the above embodiments, the battery being used to supply power to the electrical device.

[0038] Fourthly, this application provides a method for manufacturing a battery cell, the method comprising: connecting an electrode lead of a bare cell to an electrode component; bending the connected electrode lead to allow the bare cell to enter the housing space through an opening, the opening of the housing being the side with the largest area of ​​the housing; and connecting a top cover to the housing to close the opening.

[0039] Using the above method, bare cells can form a stable electrical connection with electrode components, and can be directly installed into the housing space by bending the electrode leads. Bare cells can be easily installed with the electrode components located in the housing, allowing for efficient assembly of individual battery cells.

[0040] In some embodiments, the housing includes a bottom plate and a plurality of side plates, the side plates extending along the periphery of the bottom plate and forming an accommodating space together with the bottom plate, the openings being disposed opposite to the bottom plate, and the electrode components being the bottom plate or the side plates of the housing.

[0041] Using the above method, the electrode tabs are directly connected to the base plate or side plate, resulting in a simple connection structure and convenient manufacturing. Simultaneously, it helps reduce the structural gap between the bare cell and the casing, increasing the volume ratio of the bare cell within the accommodating space and thus enhancing the energy density of the battery cell. In some embodiments, the casing includes a base plate and multiple side plates, with the side plates extending along the periphery of the base plate to form an accommodating space together. The openings are positioned opposite to the base plate, and the electrode components are disposed on at least one side plate.

[0042] Using the above method, placing the electrode components on the side plate makes it easier for the electrode components to connect with the tabs, and the structure of the battery cell is simplified.

[0043] In some embodiments, the electrode lead includes a tab, and the step of connecting the electrode lead of the bare cell to the electrode component includes: soldering the tab of the bare cell to the electrode component.

[0044] Using the above method, the bare battery cell can be easily connected to the tabs and electrode components to form a current loop.

[0045] In some embodiments, the electrode lead includes a tab and a connecting piece, and the step of connecting the electrode lead of the bare cell to the electrode component includes: soldering the tab of the bare cell to the connecting piece; and soldering the connecting piece to the electrode component.

[0046] Using the above method, the tabs do not need to be directly connected to the electrode components, allowing for more flexible connection and more flexible installation of the battery cells. Simultaneously, the connecting tabs can share the tensile force between the tabs and the electrode components, reducing the likelihood of the tabs breaking.

[0047] In some embodiments, the electrode lead includes a tab, a first connecting piece, and a second connecting piece. The step of connecting the electrode lead 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; and welding the second connecting piece to the electrode component.

[0048] Using the above method, the tab and the electrode component are connected by a first connecting piece and a second connecting piece. The first and second connecting pieces can better distribute the tensile force between the tab and the electrode component, making the tab less prone to breakage. Furthermore, the connection between the tab and the electrode component can be broken down into multiple steps, making the installation of individual battery cells more flexible.

[0049] In some embodiments, the housing includes a base plate, and the opening is disposed opposite to the base plate. Before the step of connecting the electrode lead of the bare cell to the electrode component, the housing further includes the step of making the bare cell and the base plate form a preset angle.

[0050] By using the above method, the preset angle ensures a better welding posture between the bare battery cell and the electrode components, resulting in higher welding quality. Simultaneously, the preset angle allows the bare battery cell to be positioned more easily for bending, improving the efficiency of installing the bare battery cell into the mounting space.

[0051] In some embodiments, the preset angle is not less than 45 degrees and not more than 135 degrees.

[0052] Using the above method, the bare battery cell can achieve a better welding posture when welding with the electrode components, the welding heat input is more uniform, the base material is fused more fully, the probability of incomplete welding is reduced, and the weld quality is better.

[0053] In some embodiments, during the step of connecting the electrode leads of the bare cell to the electrode components, the bare cell is perpendicular to the base plate.

[0054] Using the above methods, the contact area between the bare cell and the electrode components is larger, the welding posture is better, the welding heat input is more uniform, the base material is more fully fused, and the weld quality is better.

[0055] In some embodiments, prior to the step of connecting the top cover to the housing to close the opening, the method further includes the step of placing a tray between at least one side of the bare cell that is not provided with an electrode lead and the housing.

[0056] Using the above method, the tray can fill the gap between the bare cell and the side plate of the casing, thereby reducing the shaking of the bare cell inside the casing and making the installation of the bare cell more stable.

[0057] In some embodiments, a flange edge is provided on the side of the housing 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 housing to close the opening includes: covering the opening with the top cover and welding the top cover to the flange edge.

[0058] By using the above method, the distance between the top cover and flange connection point and the battery cell is increased, which helps to reduce the probability of battery cell damage caused by light leakage during the connection process of the top cover and flange. In addition, it can also reduce the amount of particulate matter falling into the battery cell and causing damage, thereby protecting the battery cell and improving the reliability and safety of the battery cell.

[0059] In some embodiments, after the steps of closing the opening with the top cover and welding the top cover to the flange edge, the method further includes the steps of 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.

[0060] By using the above methods, the space occupied by the flange edge and top cover can be reduced, thereby reducing the space occupied by the battery cells.

[0061] In some embodiments, before the step of welding the electrode leads of the bare cell to the electrode components, the step of wrapping an insulating film on the outer surface of the bare cell is further included.

[0062] The above methods improve the insulation performance of the bare cell's outer surface, while the insulating film protects the outer surface of the bare cell, reducing the probability of the bare cell being bumped or scratched when it is installed in the casing.

[0063] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0064] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0065] In the picture:

[0066] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments;

[0067] Figure 2 This is an exploded schematic diagram of a battery according to one or more embodiments;

[0068] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments;

[0069] Figure 4 This is a first structural schematic diagram of a battery cell according to one or more embodiments;

[0070] Figure 5 yes Figure 4 Enlarged diagram of A in the middle;

[0071] Figure 6 yes Figure 4 Another implementation diagram of A;

[0072] Figure 7 This is a schematic diagram of the second structure of a battery cell according to one or more embodiments;

[0073] Figure 8 yes Figure 7 Cross-sectional schematic diagram of BB;

[0074] Figure 9 yes Figure 7 A cross-sectional view of CC.

[0075] Figure 10 This is a third structural schematic diagram of a battery cell according to one or more embodiments;

[0076] Figure 11 yes Figure 10 Enlarged diagram of D in the middle;

[0077] Figure 12 This is a fourth structural schematic diagram of a battery cell according to one or more embodiments;

[0078] Figure 13 yes Figure 12 Enlarged diagram of E in the middle;

[0079] Figure 14 This is a fifth structural schematic diagram of a battery cell according to one or more embodiments;

[0080] Figure 15 It is a cross-sectional view of a battery cell according to one or more embodiments;

[0081] Figure 16 This is a flowchart based on one or more embodiments;

[0082] Figure 17 This is another flowchart according to one or more embodiments;

[0083] Figure 18 This is another flowchart according to one or more embodiments;

[0084] Figure 19 This is another schematic diagram of a process according to one or more embodiments.

[0085] The reference numerals in the detailed embodiments 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. Casing; 212. Accommodation space; 2121. Opening; 213. Base plate; 214. Side plate; 2141. Flange edge; 22. Bare cell; 221. Electrode lead-out component; 2211. Tab; 2212. Connecting piece; 2212a. First connecting part; 2212b. Second connecting part; 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. Detailed Implementation

[0088] The embodiments of the technical solution of this application will be described in detail below. The following embodiments are only used to illustrate the technical solution of this application more clearly, and are therefore only examples, and should not be used to limit the scope of protection of this application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0090] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise explicitly specified, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

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

[0092] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0093] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0094] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0095] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0096] During battery assembly, bare cells need to be installed into the casing, and an electrical connection needs to be established between the bare cells and the electrode components. In related technologies, the electrode components are located on the top cover, and the bare cells form an electrical connection with the electrode components when connected to the top cover, and are then installed into the casing along with the top cover. However, when the electrode components are not located on the top cover, the bare cells cannot achieve an electrical connection with the electrode components when connected to the top cover, and the welding posture between the bare cells and the electrode components changes, making installation difficult.

[0097] Based on the above considerations, in order to solve the technical problems existing in the battery cell in the prior art, this application proposes a method for manufacturing a battery cell. This method enables the bare cell of the battery cell to be easily installed even when the electrode components are set on the housing and the top cover is located on the side with the largest area of ​​the bare cell.

[0098] This application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, computers, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. The electrical device may include a battery, which can provide electrical power to achieve the corresponding functions of the device.

[0099] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

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

[0101] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery 100 can be used to power vehicle 1000; for example, battery 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. Controller 200 controls the battery 100 to supply power to motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

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

[0103] To improve the performance of electrical devices, this application also provides a battery 100. Please refer to... Figure 2 , Figure 2 The image shows an exploded view of a battery 100 provided in some embodiments of this application. The shape of the battery 100 includes, but is not limited to, a square shape. In other embodiments, the battery 100 may also be cylindrical, square, or any other arbitrary shape. An energy storage device is a type of battery 100 and can be used as part of a power grid or in residential or commercial settings for storing and / or releasing electrical energy. The energy storage device may 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 provides a space for housing 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, together defining a space for housing the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering 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 cuboid, etc.

[0105] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0106] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0107] The battery cell 20 includes bare cells, which are manufactured using two methods: lamination and winding. Therefore, battery 100 is divided into two types: lamination batteries and winding batteries. Lamination batteries have uniform current collection, low internal resistance, and high specific power, but require extremely high mold precision, have high equipment investment, and a more complex process, resulting in low production efficiency. Winded batteries are simpler to manufacture, with less stringent equipment precision requirements during the sheet fabrication and assembly processes, resulting in high production efficiency and lower cost. In terms of performance, winding batteries possess excellent high and low temperature performance, very rapid charging, ultra-long lifespan, stable high output voltage, and a robust structure with strong shock resistance. Please refer to [link / reference]. Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments. A battery cell 20 refers to the smallest unit that makes up a battery. A battery cell 20 includes a top cover 24, a casing 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 aluminum alloy), so that the top cover 24 is not easily deformed when subjected to compression and impact, so that the battery cell 20 can have higher structural strength and improved safety performance. The material of the top cover 24 can also be various, 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 releasing 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 inner side of the top cover 24. The insulating member can be used to isolate the electrical connection components in the housing 21 from the top cover 24 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0109] The housing 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 accommodate the bare cell 22, electrolyte, and other components. The housing 21 and the top cover 24 can be independent components. An opening 2121 can be provided on the housing 21, and the top cover 24 can close the opening 2121 to form the internal environment of the battery cell 20. Alternatively, the top cover 24 and the housing 21 can be integrated. Specifically, the top cover 24 and the housing 21 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 21, the top cover 24 closes the housing 21. The housing 21 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the bare cell 22. The material of the housing 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 in the battery cell 20 where the electrochemical reaction occurs. The casing 21 may contain one or more bare cells 22. The bare cell 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the cell body of the bare cell 22, while the portions of the positive and negative electrode sheets without active material each constitute a tab 2211. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte, and the tabs 2211 connect to the electrode components 25 to form a current loop.

[0111] Please see Figure 4 to Figure 6 , Figure 4 This is a first structural schematic diagram of a battery cell according to one or more embodiments;Figure 5 yes Figure 4 Enlarged diagram of A in the middle; Figure 6 yes Figure 4 A schematic diagram of another implementation of A. (Combined with...) Figure 1 to Figure 3 According to some embodiments of this application, this application also 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, and 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-out member 221 is disposed on one side of the bare cell 22. The housing 21 includes an electrode component 25 or the housing 21 is connected to an electrode component 25. The electrode lead-out member 221 is connected to the electrode component 25, and the electrode lead-out member 221 has a bent structure.

[0112] The opening 2121 being located on the side with the largest surface area of ​​the housing 21 means that the plane containing the opening 2121 has the largest area on the outer surface of the housing 21. The area of ​​the plane containing the opening 2121 on the outer surface of the housing 21 is the same as the surface area of ​​the top cover 24 away from the housing 21. The electrode lead 221 is conductive. The electrode component 25 can be integrally formed with the housing 21. The electrode component 25 can also be separately formed 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] Using the above method, the bare cell 22 can be inserted into the housing 21 through the opening 2121 on the side with the largest area of ​​the housing 21, and can be well connected to the electrode component 25 located on the housing 21, allowing for efficient assembly of the battery cell 20. Meanwhile, the bent structure of the electrode lead 221 makes the electrode lead 221 more compact, occupies less space, and helps to reduce the gap between the bare cell 22 and the housing 21, thereby increasing the energy density of the battery cell 20 per unit volume.

[0114] According to some embodiments of this 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. The tab 2211 has a bent structure.

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

[0116] Please see Figure 7 to Figure 9 , Figure 7 This is a schematic diagram of the second structure of a battery cell according to one or more embodiments; Figure 8 yes Figure 7 Cross-sectional schematic diagram of BB;Figure 9 yes Figure 7 A cross-sectional schematic diagram of the middle CC. According to some embodiments of this application, the electrode lead-out member 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 according to specific circumstances; for example, the connecting piece 2212 can be in the form of a thin sheet. The bending configuration of the tab 2211 and / or the connecting piece 2212 can be customized according to specific circumstances. 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 bent structures.

[0118] Using 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 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 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 extends at least partially into the gap. The first connecting portion 2212a and the second connecting portion 2212b can be integrally formed or separate.

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

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

[0123] Using the above method, the tab 2211 can be connected in a flexible position, and the battery cell 20 can be assembled easily.

[0124] According to some embodiments of this 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 tab 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. At least one of the tab 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 set according to actual conditions. For example, the first connecting piece 2212c and the second connecting piece 2212d can be sheet-like. The bending of the tab 2211, the first connecting piece 2212c, and the second connecting piece 2212d can be set according to actual conditions. For example, in one specific embodiment, the tab 2211 is a bent structure. In another specific embodiment, the tab 2211 and the first connecting piece 2212c are bent structures. In yet another specific embodiment, the first connecting piece 2212c and the second connecting piece 2212d are bent structures.

[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 installation of the battery cell 20 more flexible.

[0127] According to some embodiments of this application, the housing 21 includes a base plate 213 and a plurality of side plates 214. The side plates 214 extend along the periphery of the base plate 213 and together with the base plate 213 form an accommodating space 212, and at least one side plate 214 is provided with an electrode component 25.

[0128] The base plate 213 is the second largest side surface of the housing 21. The base plate 213 can be positioned opposite the opening 2121. The side plates 214 can be positioned at an angle to the base plate 213, for example, at 90 degrees. The number of side plates 214 can be adjusted according to actual needs; in this embodiment, four side plates 214 are used. The accommodating space 212 is used to accommodate the bare battery cell 22. The electrode component 25 can be disposed on one side plate 214 or on multiple side plates 214.

[0129] Using the above method, the casing 21 can effectively accommodate the bare battery cell 22. Meanwhile, the electrode component 25 is positioned on the side plate 214, which facilitates the connection between the electrode component 25 and the tab 2211, simplifying the structure of the battery cell 20.

[0130] In one specific 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] Using the above method, the tab 2211 occupies less space and has a more compact structure, which helps to reduce the gap between the bare cell 22 and the side plate 214 where the electrode components 25 are located, making the bare cell 22 less prone to shaking. At the same time, the bare cell 22 can have a larger volume, which helps to increase the amount of energy that the battery cell 20 can store per unit volume.

[0133] According to some embodiments of this application, the distance L1 between the bare cell 22 and the side plate 214 of the housing 21 where the electrode component 25 is not provided is 0.5mm-2mm. For example, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm.

[0134] Using the above method, a smaller gap can be formed between the bare cell 22 and the side plate 214 without electrode components 25, further confining the bare cell 22 within the accommodating space 212. This makes the bare cell 22 less prone to shaking, improving the stability of the battery cell 20. Simultaneously, the bare cell 22 occupies a larger volume proportion within the battery cell 20, which is beneficial for increasing the amount of energy that the battery cell 20 can store per unit volume.

[0135] Please see Figure 10 to Figure 11 , Figure 10 This is a third structural schematic diagram of a battery cell according to one or more embodiments; Figure 11 yes Figure 10 An enlarged diagram of D in the diagram. (Combined with...) Figure 1 to Figure 9 According to some embodiments of this application, a support plate 23 is provided between the bare cell 22 and the side plate 214 of the housing 21 where the electrode component 25 is not provided.

[0136] The number and placement of the trays 23 can be set according to actual conditions. In one embodiment, one tray 23 is placed between the bare cell 22 and the side plate 214 of the housing 21 opposite to the side plate 214 where the electrode component 25 is provided. In another embodiment, one tray 23 is placed between the bare cell 22 and the side plate 214 adjacent to the side plate 214 where the electrode component 25 is provided. In yet another embodiment, one tray 23 is placed between the bare cell 22 and the side plate 214 of the housing 21 opposite to the side plate 214 where the electrode component 25 is provided, and another tray 23 is placed between the bare cell 22 and the side plate 214 adjacent to the side plate 214 where the electrode component 25 is provided.

[0137] The material of the tray 23 can include resin and metal. Using resin for the tray 23 helps improve its buffering performance, making the bare battery cell 22 less likely to be damaged by collisions with the tray 23. Using metal for the tray 23 can enhance its limiting ability, better restricting the movement of the bare battery cell 22.

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

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

[0140] The thickness of the base plate 231 can be less than or equal to the gap between the bare cell 22 and the side plate 214 on which the electrode component 25 is disposed.

[0141] By using the above method, the bottom plate 231 can fill the gap between the bare cell 22 and the side plate 214 in the housing 21 that is opposite to the side plate 214 on which the electrode component 25 is provided, which helps to reduce the shaking of the bare cell 22 in the housing 21 and makes the installation of the bare cell 22 more stable.

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

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

[0144] Using the above method, the side support plate 232 can fill the gap between the bare cell 22 and the side plate 214 adjacent to the side plate 214 where the electrode component 25 is provided in the housing 21, which helps to reduce the shaking of the bare cell 22 in the housing 21 and makes the installation of the bare cell 22 more stable.

[0145] Please continue reading. Figure 1 to Figure 11 According to some embodiments of this application, the thickness L2 of the tray 23 is less than or equal to the distance L1 between the bare cell 22 and the side plate 214 of the housing 21 where the electrode component 25 is not provided. The thickness L2 of the tray 23 can be 0.1mm-1.5mm. For example, 0.1mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm.

[0146] Using the above method, the tray 23 can effectively fill the gap between the bare cell 22 and the side plate 214 of the casing 21 where no electrode components 25 are provided. At the same time, the smaller thickness of the tray 23 facilitates its installation between the bare cell 22 and the side plate 214 of the casing 21 where no electrode components 25 are provided, thereby improving the organization efficiency of the battery cell 20.

[0147] Please see Figure 12 to Figure 15 , Figure 12 This is a fourth structural schematic diagram of a battery cell according to one or more embodiments; Figure 13 yes Figure 12 Enlarged diagram of E in the middle; Figure 14 This is a fifth structural schematic diagram of a battery cell according to one or more embodiments; Figure 15 This is a cross-sectional view of a battery cell according to one or more embodiments. According to some embodiments of this 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 an accommodating 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 outward from the end of the side plate 214 away from the bottom plate 213 into the accommodating space 212. The top cover 24 is connected to the flange edge 2141.

[0148] Specifically, the housing 21 may have a base plate 213 and four side plates 214. A flange edge 2141 is connected to the side of the side plate 214 away from the base plate 213. The flange edge 2141 and the side plate 214 can be separate components. Alternatively, the flange edge 2141 and the side plate 214 can be integrally formed. The flange edge 2141 extends from the end of the side plate 214 away from the base plate 213, and also extends outward into the accommodating space 212, so that the flange edge 2141 is located on the outer periphery of the side plate 214.

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

[0150] In the above manner, the top cover 24 is connected to the flange edge 2141 of the housing 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, 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 amount of particulate matter falling into the bare cell 22 and causing damage to 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 this application, the side plate 214 is connected to the bottom plate 213 by a first transition angle α, and the side plate 214 is connected to the flange edge 2141 by a second transition angle β.

[0152] Specifically, the side plate 214 and the bottom plate 213 are connected by a first transition angle α, so that the side plate 214 and the bottom plate 213 are set at a certain angle, which improves the stability and reliability of the housing 21. The size and shape of the accommodating space 212 will vary 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 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 plate 214 and the bottom plate 213 are set perpendicularly. 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 plate 214 and the flange edge 2141 are connected by a second transition angle β, so that the side plate 214 and the flange edge 2141 are set at a certain angle, which improves the stability and reliability of the flange edge 2141, thereby improving the stability and reliability of the shell 21. The angle of the second transition angle β can also be greater than 0 degrees and less than 180 degrees, such as 30 degrees, 60 degrees, 90 degrees, 120 degrees, 138 degrees, etc. When the angle of the second transition angle β is 90 degrees, the side plate 214 and the flange edge 2141 are set perpendicularly. When the flange edge 2141 is set parallel to the base plate 213, the angle of the second transition angle β is the same as the angle of the first transition angle α.

[0154] In the above manner, the first transition angle α and the second transition angle β can improve the stability of the housing 21, thereby improving the stability of the top cover 24 connected to the flange edge 2141, and thus providing electrical protection for the bare battery cell 22.

[0155] According to some embodiments of this 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 increases the connection stability between the side plate 214 and the flange edge 2141.

[0156] According to some embodiments of this application, a side plate 214 is disposed around a base plate 213, a flange edge 2141 is disposed around a side plate 214, and the flange edge 2141 is connected to a top cover 24.

[0157] Specifically, the side plates 214 surround the base plate 213 to form an accommodating space 212. When the shell 21 is cuboid, there are four side plates 214. When the shell 21 is cylindrical, there can be one side plate 214 arranged in a ring. When the shell 21 is hexagonal prism, there are six side plates 214. The number of side plates 214 can be determined according to the shape of the shell 21, and is not limited here.

[0158] Each side plate 214 is provided with a corresponding flange edge 2141. The number and shape of the flange edges 2141 vary depending on the number of side plates 214. When the shell 21 is cuboid, there are four side plates 214 and four flange edges 2141. When the shell 21 is cylindrical, there can be one side plate 214 arranged in a ring, and there can also be one flange edge 2141 arranged in a ring. In other embodiments, the shell 21 is not limited to the above-mentioned cuboid or cylindrical shapes, meaning the number and shape of the flange edges 2141 are not limited to the above-mentioned quantities and shapes. Of course, the number of flange edges 2141 can also differ from the number of side plates 214, which is not limited here. The flange edges 2141 are parallel to the top cover 24, facilitating a closer fit between the top cover 24 and the flange edges 2141.

[0159] In the above manner, each side plate 214 is provided with a corresponding flange edge 2141, and the top cover 24 is connected to all flange edges 2141, so that the connection position is located on the flange edge 2141, thereby improving the protection performance of the bare cell 22.

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

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

[0162] The above method avoids the top cover 24 and / or flange edge 2141 from puncturing adjacent battery cells 20 or the casing 10 in the battery 100; it also makes the battery cell 20 itself more compact, which is convenient for multiple battery cells 20 to be connected in series or in parallel.

[0163] According to some embodiments of this application, the housing 21 is a one-piece molded structure.

[0164] Specifically, the base plate 213 and the side plates 214 are integrally formed. When the number of side plates 214 is four, the four side plates 214 are integrally formed with the base plate 213 and surround to form an accommodating space 212. In this way, the shell 21 is more stable, thereby improving the stability of the connection between the top cover 24 and the flange edge 2141 on the shell 21.

[0165] In this way, the housing 21 becomes more stable, thereby improving the stability of the connection between the top cover 24 and the flange edge 2141 on the housing 21.

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

[0167] Specifically, to facilitate the connection of the top cover 24 to the flange edge 2141, the distance by which the flange edge 2141 extends outward from the end of the side plate 214 away from the bottom plate 213 and into the accommodating space 212 is increased. This also allows for an increase in the size of the top cover 24, thus facilitating its fit with the flange edge 2141. Simultaneously, the maximum outward extension distance of the flange edge 2141 is limited to reduce material costs. Specifically, the outward extension distance of the flange edge 2141 along the side plate 214 away from the bottom plate 213 and into the accommodating space 212 can be greater than 0 mm. The outward extension distance of the flange edge 2141 along the side plate 214 away from the bottom plate 213 and into the accommodating space 212 can be less than or equal to 10 mm. The outward extension distance of the flange edge 2141 along the side plate 214 away from the bottom plate 213 and into the accommodating space 212 is defined as L3, as... Figure 13 As shown. 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 edge 2141, the edges of the top cover 24 and the edges of the flange edge 2141 away from the side plate 214 need to be trimmed. During the trimming process, the actual connection point W between the top cover 24 and the flange edge 2141 should be avoided. The distance between the edge of the flange edge 2141 away from the side plate 214 and the outer surface of the side plate 214 should not exceed a predetermined threshold (not shown in the figure). That is, the trimming position is greater than or equal to the predetermined threshold position. This predetermined threshold increases the distance between the connection point W and the bare cell 22, reducing damage to the bare cell 22 caused by laser leakage; additionally, it also reduces the risk of particulate matter falling into the bare cell 22 and causing damage, thus protecting the bare cell 22.

[0169] The aforementioned predetermined threshold can 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 can be, but is not limited to, 1 mm, 2.1 mm, 3 mm, 3.7 mm, 4 mm, 5 mm, etc.

[0170] The above method limits the distance between the actual connection position of the flange edge 2141 and the top cover 24 and the bare cell 22, reducing damage to the bare cell 22 caused by laser leakage and falling particulate matter.

[0171] According to some embodiments of this application, one of the two sides of the flange edge 2141 facing the top cover 24 and the top cover 24 facing the flange edge 2141 is provided with an alignment groove, and the other is provided with an alignment part, which is inserted into the alignment groove.

[0172] Specifically, the flange edge 2141 has an alignment groove on the side facing the top cover 24. The top cover 24 has an alignment part on the side facing the flange edge 2141. When the top cover 24 is connected to the flange edge 2141, the alignment part is inserted into the alignment groove. At this time, the top cover 24 and the flange edge 2141 fit tightly together.

[0173] Alternatively, the side of the flange edge 2141 facing the top cover 24 may have an alignment portion. The side of the top cover 24 facing the flange edge 2141 may have an alignment groove. When the top cover 24 is connected to the flange edge 2141, the alignment portion is inserted into the alignment groove. At this time, the top cover 24 and the flange edge 2141 fit tightly together.

[0174] Through the above method, the alignment part and the alignment groove are inserted and aligned, and the top cover 24 can be quickly positioned on the flange edge 2141, improving the efficiency of installing the top cover 24 onto the housing 21, thereby improving the installation efficiency of the battery cell 20.

[0175] According to some embodiments of this 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 plate 214 and the edge of the top cover 24, wherein the welding position is the aforementioned connection position W. The welding position is spaced apart from the bare battery cell 22 to prevent damage to the bare battery cell 22 from welding lasers or particulate matter. This method achieves welding and fixing of the flange 2141 and the top cover 24, which is simple and easy to implement.

[0177] The above method achieves welding and fixing of flange edge 2141 and top cover 24, which is simple and easy to implement.

[0178] According to some embodiments of this application, this application also provides a battery 100, including the battery cell 20 described in any of the above embodiments. The battery 100 can be an energy storage device, etc. An energy storage device is a type of battery 100, which can be used as part of the power grid, or in residential or commercial settings, for storing and / or releasing electrical energy. The energy storage device can be an energy storage cabinet, an energy storage container, etc.

[0179] According to some embodiments of this application, this application also provides an electrical device including the battery 100 described in any of the above embodiments, and the battery 100 is used to provide electrical energy to the electrical device.

[0180] The electrical device can be a mobile phone, computer, car, or any of the aforementioned devices or systems that use battery 100.

[0181] Please see Figure 16 to Figure 18 , Figure 16 This is a flowchart based on one or more embodiments; Figure 17 This is another flowchart according to one or more embodiments; Figure 18 This is a schematic diagram of another process according to one or more embodiments. According to some embodiments of this application, this application provides a method for manufacturing a battery cell 20. The method for manufacturing a battery cell 20 includes:

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

[0183] S120: The electrode lead-out piece 221 after connection is completed is bent so that the bare cell 22 enters the housing space 212 of the housing 21 through the opening 2121 of the housing 21. The opening 2121 of the housing 21 is the side with the largest area of ​​the housing 21.

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

[0185] Specifically, electrode component 25 is disposed in housing 21 and may be at least partially located within receiving space 212 of housing 21. Electrode component 25 can be used for electrical connection with bare cell 22 for outputting or inputting electrical energy of battery cell 20. In some embodiments, electrode component 25 may include positive electrode component 25 and negative electrode component 25 for current output and connection to external circuitry. The method of connecting electrode lead 221 to electrode component 25 may include laser welding, friction welding, ultrasonic welding, etc. Electrode component 25 may include electrode post, etc. Electrode lead 221 may include tab 2211, adapter plate, etc.

[0186] Before connection, the electrode lead 221 of the bare cell 22 can be located on one side of the housing 21 and outside the receiving space 212. After the electrode lead 221 is connected to the electrode component 25, the electrode lead 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 receiving 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 is completely inserted into the receiving space 212 of the housing 21.

[0187] The opening 2121 can be located on the side of the housing 21 with the largest area. The top cover 24 can close the opening 2121 by closing it. The connection method between the top cover 24 and the housing 21 can include laser welding, tungsten inert gas welding, etc. When the top cover 24 closes the opening 2121, the accommodating space 212 is isolated from the external environment.

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

[0189] According to some embodiments of this 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 an accommodating space 212. The opening 2121 is disposed opposite to the bottom plate 213. The electrode component 25 is either the bottom plate 213 or the side plate 214 of the housing 21.

[0190] Specifically, when the electrode component 25 is the base plate 213 or side plate 214 of the housing 21, the electrode tab 2211 is connected to the base plate 213 or side plate 214. The side plate 214 can be set at a certain angle to the base plate 213, for example, at 90 degrees. The number of side plates 214 can be set according to the actual situation. In this embodiment, the number of side plates 214 is four. The accommodating space 212 is used to accommodate the bare battery cell 22.

[0191] Using the above method, the tab 2211 is directly connected to the base plate 213 or the side plate 214, resulting in a simple connection structure and convenient production. Simultaneously, it helps reduce the structural gap between the bare cell 22 and the casing 21, increasing the volume ratio of the bare cell 22 within the accommodating space 212, thereby enhancing the energy density of the battery cell 20.

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

[0193] Specifically, the base plate 213 is the side with the largest area of ​​the housing 21. The side plates 214 can be set at a certain angle to the base plate 213, for example, at 90 degrees. The number of side plates 214 can be set according to the actual situation; in this embodiment, the number of side plates 214 is four. The accommodating space 212 is used to accommodate the bare battery cell 22.

[0194] Using the above method, it is more convenient to connect the electrode component 25 to the tab 2211 by setting the electrode component 25 on the side plate 214, and the structure of the battery cell 20 is simplified.

[0195] According to some embodiments of this 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: Weld the tabs 2211 of the bare cell 22 to the electrode component 25.

[0197] Using the above method, the bare cell 22 can be easily connected to the tab 2211 and the electrode component 25 to form a current loop.

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

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

[0200] S312: Weld 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 the other end to the electrode component 25. Alternatively, one end of the connecting piece 2212 can be welded to the electrode component 25 first, and the other end to the tab 2211. In other words, the order of S311 and S312 can be interchanged. The shape of the connecting piece 2212 can be set according to actual conditions; for example, the connecting piece 2212 can be in the form of a thin sheet for easier bending.

[0202] Using the above method, the tab 2211 does not need to be directly connected to the electrode component 25. The tab 2211 can be connected to the electrode component 25 more flexibly, and the battery cell 20 can be installed flexibly. At the same time, the connecting piece 2212 can share the tensile force between the tab 2211 and the electrode component 25, making the tab 2211 less prone to breakage.

[0203] Please see Figure 19 , Figure 19 This is another schematic diagram based on one or more embodiments. (In conjunction with...) Figure 1 to Figure 18 According to some embodiments of this application, the electrode lead-out member 221 includes a tab 2211, a first connecting piece 2212c, and a second connecting piece 2212d. The step of connecting the electrode lead-out member 221 of the bare cell 22 to the electrode component 25 includes:

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

[0205] S412: Weld the first connecting piece 2212c to the second connecting piece 2212d;

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

[0207] Specifically, the first connecting piece 2212c is made of a conductive material. The second connecting piece 2212d is also 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. In one 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 second connecting piece 2212d is welded to the other end of the first connecting piece 2212c, the second connecting piece 2212d is then welded to the electrode component 25. In other words, the execution order of S411, S412, and S413 can be interchanged. They can be executed in the order of S411, S412, S413, S412, S411, S413, or S413, S411, S412. Other execution orders include: S411, S413, S412; S412, S413, S411; S413, S412, 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 one end of 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] 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 tab 2211. After the welding of the other end of the first connecting piece 2212c to the 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 the actual situation. For example, the first connecting piece 2212c can be in the form of a thin sheet to facilitate bending. The second connecting piece 2212d can also be in the form of a thin sheet to facilitate bending.

[0211] Using the above method, the tab 2211 and the electrode component 25 are connected by a first connecting piece 2212c and a second connecting piece 2212d. The first connecting piece 2212c and the second connecting piece 2212d can better distribute the tensile force between the tab 2211 and the electrode component 25, making the tab 2211 less prone to breakage. At the same time, the connection between the tab 2211 and the electrode component 25 can be broken down into multiple steps, making the installation of the battery cell 20 more flexible.

[0212] According to some embodiments of this application, the housing 21 includes a base plate 213, and an opening 2121 is disposed opposite to the base plate 213. Before the step of connecting the electrode lead-out member 221 of the bare cell 22 to the electrode component 25, the following step is also included:

[0213] S402: Make the bare cell 22 and the base plate 213 form a preset angle P.

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

[0215] By using the above method, the preset angle P allows the bare battery cell 22 and the electrode component 25 to have a better welding posture, resulting in better welding quality between the bare battery cell 22 and the electrode component 25. At the same time, the preset angle P allows the bare battery cell 22 to be in a position that is easier to bend, improving the efficiency of installing the bare battery cell 22 into the accommodating space 212.

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

[0217] The above method makes it easier to connect the tab 2211 to the electrode component 25, which helps to improve the connection quality.

[0218] According to some embodiments of this 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, and 135 degrees.

[0219] Using the above method, the bare cell 22 can have a better welding posture when welding with the electrode component 25, the welding heat input is more uniform, the base material is more fully fused, the probability of incomplete welding is reduced, and the weld quality is better.

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

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

[0222] Using the above method, the contact area between the bare cell 22 and the electrode component 25 is larger, the welding posture is better, 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 this application, before the step of welding the top cover 24 to the housing 21 to close the opening 2121, the following step is also included:

[0224] S330: A tray 23 is placed between the bare cell 22 and the housing 21 on at least one side of the bare cell 22 that is not provided with an electrode lead 221.

[0225] The number and placement of the trays 23 can be set according to actual conditions. In one embodiment, one tray 23 is placed between the housing 21 and the bare cell 22 on the side opposite to the side where the tab 2211 is provided. In another embodiment, one tray 23 is placed between the housing 21 and the bare cell 22 on the side adjacent to the side where the tab 2211 is provided. In yet another embodiment, one tray 23 is placed between the housing 21 and the bare cell 22 on the side opposite to the side where the tab 2211 is provided, and another tray 23 is placed between the housing 21 and the bare cell 22 on the side adjacent to the side where the tab 2211 is provided.

[0226] The material of the tray 23 can include plastic, resin, and metal. Plastic can be polypropylene, polyethylene, etc. Using resin plastic for the tray 23 helps improve its cushioning performance, making the bare battery cell 22 less prone to damage from collisions with the tray 23. Using metal for the tray 23 enhances its limiting ability, better restricting the movement of the bare battery cell 22.

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

[0228] According to some embodiments of this application, a flange edge 2141 is provided on the side of the housing 21 facing the top cover 24. The flange edge 2141 extends in a direction 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 edge 2141.

[0230] Specifically, the housing 21 may have a base plate 213 and four side plates 214. A flange edge 2141 is connected to the side of the side plate 214 away from the base plate 213. The flange edge 2141 and the side plate 214 can be separate components. Alternatively, the flange edge 2141 and the side plate 214 can be integrally formed. The flange edge 2141 extends from the end of the side plate 214 away from the base plate 213, and also extends outward into the accommodating space 212, so that the flange edge 2141 is located on the outer periphery of the side plate 214.

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

[0232] By using 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 helps 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 this application, after the steps of covering the opening 2121 with the top cover 24 and welding the top cover 24 to the flange edge 2141, the method further includes the following steps:

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

[0235] Specifically, the edge of flange 2141 away from the accommodating space 212 refers to the portion between the welded position of flange 2141 and top cover 24 and the edge of flange 2141 away from the accommodating space 212. When removing the edge of flange 2141 away from the accommodating space 212, the entire portion can be removed, or only a portion can be removed.

[0236] The edge of the top cover 24 refers to the portion from the welded position of the top cover 24 to the edge of the top cover 24 away from the receiving space 212. When removing the edge of the top cover 24, the entire portion can be removed, or only a portion of the portion can be removed.

[0237] By using the above 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 this application, before the step of welding the tab 2211 of the bare cell 22 to the electrode component 25, the following step is further included:

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

[0240] Specifically, the insulating film is made of insulating material. The insulating film is similar to plastic sheeting. The insulating film can completely cover the outer surface of the bare battery cell 22. The insulating film can also partially cover the outer surface of the bare battery cell 22. For example, the insulating film covers the side of the bare battery cell 22 other than the side where the tab 2211 is located.

[0241] The above method improves the insulation performance of the outer surface of the bare cell 22, while the insulating film protects the outer surface of the bare cell 22, reducing the probability of the bare cell 22 being bumped or scratched when it is installed in the housing 21.

[0242] Finally, according to some embodiments of this application, the manufacturing method of the battery cell 20 includes: connecting the electrode lead 221 of the bare cell 22 to the electrode component 25. The electrode lead 221, after connection, is bent so that the bare cell 22 enters the receiving space 212 of the housing 21 through the opening 2121, where the opening 2121 is the side of the housing 21 with the largest area. The top cover 24 is welded to the housing 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 into the receiving space 212 of the housing 21 by bending the electrode lead 221. The bare cell 22 can be easily installed with the electrode component 25 disposed on the housing 21, and the battery cell 20 can be assembled efficiently.

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

Claims

1. A battery cell, characterized by, The battery cell comprises a bare cell, a top cover and a shell, the shell has an opening, the shell is connected with the top cover, the top cover covers the opening, the top cover and the shell form a containing space, the bare cell is arranged in the containing space, the opening is located at the side of the shell with the largest area, one side of the bare cell is provided with an electrode lead-out piece, the shell comprises an electrode component or is connected with the electrode component, the electrode lead-out piece is connected with the electrode component, and the electrode lead-out piece is a bending structure; The electrode lead-out piece comprises a tab and a connecting piece, the tab is arranged on one side of the bare cell, one end of the connecting piece is connected with the tab, and the other end of the connecting piece is connected with the electrode component, and the tab and the connecting piece are bending structures; The connecting piece comprises a first connecting part connected with the tab and a second connecting part connected with the electrode component, and the connecting piece is a concave structure with an opening on one side; A gap is formed between the first connecting part and the second connecting part, the gap is located in the concave structure and communicates with the opening, and the tab extends at least partially into the gap through the opening; The connecting piece is in the form of a sheet to facilitate bending.

2. The battery cell of claim 1, wherein, The shell comprises a bottom plate and a plurality of side plates, the side plates extend along the periphery of the bottom plate and form the containing space together with the bottom plate, and at least one of the side plates is provided with the electrode component.

3. The battery cell of claim 2, wherein, The distance between the bare cell and the side plate of the shell without the electrode component is 0.5-2 mm.

4. The battery cell of claim 2, wherein, A supporting plate is arranged between the bare cell and the side plate of the shell without the electrode component.

5. The battery cell of claim 4, wherein, The supporting plate comprises a bottom supporting plate arranged between the bare cell and the side plate of the shell opposite to the side plate provided with the electrode component.

6. The battery cell of claim 4, wherein, The supporting plate comprises a side supporting plate arranged between the bare cell and the side plate of the shell adjacent to the side plate provided with the electrode component.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The shell comprises a bottom plate and a plurality of side plates, the side plates extend along the periphery of the bottom plate and form the containing space together with the bottom plate, a flange is connected to the side of the side plate away from the bottom plate, the flange extends outward from the end of the side plate away from the bottom plate to the outside of the containing space, and the top cover is connected to the flange.

8. The battery cell of claim 7, wherein, The side plate and the bottom plate are connected through a first adapter corner, and the side plate and the flange are connected through a second adapter corner.

9. The battery cell of claim 7, wherein, The side plate surrounds the bottom plate, and the flange surrounds the side plate and is connected with the top cover.

10. The battery cell of claim 7, wherein, The edge of the top cover is aligned with the edge of the flange away from the side plate.

11. The battery cell of claim 7, wherein, The shell is an integral structure.

12. The battery cell of claim 7, wherein, The maximum distance between the edge of the flange away from the side plate and the outer surface of the side plate is not greater than 5 mm.

13. A battery, characterized by The battery comprises the battery cell of any one of claims 1-12.

14. An electrical device, comprising: The electric device comprises the battery of claim 13, and the battery is used for supplying power to the electric device.

15. A method of manufacturing a battery cell, characterized by, The application relates to a method for manufacturing a battery cell, wherein the battery cell comprises a bare battery core, a top cover and a shell, the shell has an opening, the shell is connected with the top cover, the top cover covers the opening, the top cover and the shell form a containing space, the bare battery core is arranged in the containing space, the opening is located at a side with the largest area of the shell, one side of the bare battery core is provided with an electrode lead-out piece, the shell comprises an electrode component or is connected with the electrode component, the electrode lead-out piece is connected with the electrode component, and the electrode lead-out piece is in a bent structure; the electrode lead-out piece comprises a tab and a connecting sheet, the tab is arranged on one side of the bare battery core, one end of the connecting sheet is connected with the tab, and the other end of the connecting sheet is connected with the electrode component; the tab and the connecting sheet are in a bent structure; the connecting sheet comprises a first connecting part connected with the tab and a second connecting part connected with the electrode component, the connecting sheet is in a concave structure with an opening on one side; a gap is formed between the first connecting part and the second connecting part, the gap is located in the concave structure and communicates with the opening, and the tab extends at least partially into the gap through the opening. The connecting sheet is in a sheet shape to facilitate bending; the method comprises the following steps: connecting the electrode lead-out piece of the bare battery core with an electrode component; bending the connected electrode lead-out piece to make the bare battery core enter the containing space of the shell through the opening of the shell, wherein the opening of the shell is located at a side with the largest area of the shell; connecting the top cover with the shell to close the opening.

16. The method of manufacturing a battery cell according to claim 15, wherein The shell comprises a bottom plate and a plurality of side plates, the side plates extend along the periphery of the bottom plate and form the containing space together with the bottom plate, the opening is arranged opposite to the bottom plate, and the electrode component is arranged on the bottom plate or the side plate of the shell.

17. The method of manufacturing a battery cell according to claim 15, wherein The shell comprises a bottom plate and a plurality of side plates, the side plates extend along the periphery of the bottom plate and form the containing space together with the bottom plate, the opening is arranged opposite to the bottom plate, and the electrode component is arranged on at least one side plate.

18. The method of manufacturing a battery cell according to claim 15, wherein The step of connecting the electrode lead-out piece of the bare battery core with an electrode component comprises the following steps: welding the tab of the bare battery core with the connecting sheet; welding the connecting sheet with the electrode component.

19. The method of manufacturing a battery cell according to claim 15, wherein The shell comprises 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 battery core with an electrode component, the method further comprises the following step: arranging the bare battery core at a preset angle with the bottom plate.

20. The method of manufacturing a battery cell according to claim 19, wherein The preset angle is not less than 45 degrees and not more than 135 degrees.

21. The method of manufacturing a battery cell according to claim 19 or 20, characterized in that, In the step of connecting the electrode lead-out piece of the bare battery core with an electrode component, the bare battery core is perpendicular to the bottom plate.

22. The method of manufacturing a battery cell according to claim 15, wherein Before the step of connecting the top cover with the shell to close the opening, the method further comprises the following step: arranging a supporting plate between at least one side of the bare battery core without the electrode lead-out piece and the shell.

23. The method of manufacturing a battery cell according to claim 15, wherein The side of the shell facing the top cover is provided with a flange, the flange extends away from the containing space, and the step of connecting the top cover with the shell to close the opening comprises the following steps: The top cover covers the opening and is welded with the flange.

24. The method of manufacturing a battery cell according to claim 23, wherein After the step of covering the opening with the top cover and welding the top cover with the flange, the method further comprises the steps of: Cutting the welded flange and the top cover to remove the edge of the flange away from the accommodation space and the edge of the top cover.

25. The method of manufacturing a battery cell according to claim 15, wherein Before the step of connecting the electrode lead-out of the bare battery cell with the electrode component, the method further comprises the step of: Wrapping the outer surface of the bare battery cell with an insulating film.

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