Battery cell, battery, power receiving device, and method of manufacturing battery cell

Abstract

To provide a battery cell, a battery, a powered device, and a manufacturing method of the battery cell, for improving a battery safety problem caused when bending a tab.SOLUTION: A battery cell includes an electrode assembly including: a main body part; and a tab 232 that extends from the main part and is formed by bending a plurality of tab sheets stacked in layer The tab includes: a first bending part 232a; and a straight part 232b which is connected to the main body part via the first bending part, and at least on which a second bending part 232c is formed projecting toward the main body part side. Arrangement of the second bending part causes a part of the tap to deform to project toward the main body part side, and this deformation causes the layers of the tab to close together, forming a local binding of the tab, and increasing resistance to separation between the layers of the tab, thereby, avoiding the tab bifurcation and improving safety of a battery.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present application relates to the field of battery technology, and more particularly to a battery cell, a battery, a power receiving device, and a method for manufacturing a battery cell. [Background technology]

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, with their energy-saving and environmentally friendly advantages, are an important component of this. Battery technology is a key element in the development of electric vehicles.

[0003] As an important unit of a battery cell, the electrode assembly needs to have its tabs folded to save space in order to improve the energy density of the battery. However, folding a tab having multiple tab sheets may affect the safety performance of the battery. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery cell, a battery, a power receiving device, and a method for manufacturing a battery cell to improve battery safety issues caused when bending a tab.

[0005] In a first aspect, the present application provides a battery cell comprising an electrode assembly including a main body portion and a tab protruding from the main body portion, the tab being formed by folding a plurality of stacked tab sheets, wherein the tab includes a first bent portion and a straight portion connected to the main body portion via the first bent portion, and at least the straight portion is formed with a second bent portion protruding toward the main body portion.

[0006] In the technical content of the embodiments of the present application, by providing a second bending portion, a part of the tab is deformed to protrude toward the main body portion, and this deformation closes the gap between the layers of the tab, forming a local constraint on the tab, increasing the separation resistance between the layers of the tab, and further preventing the tab from branching, thereby improving the safety of the battery.

[0007] In some embodiments, the straight portion and the first bent portion are formed with a second bent portion, which increases the area where the tab is constrained and further prevents the tab from branching.

[0008] In some embodiments, the first bent portion has a first bending axis, and the second bent portion has a second bending axis, which are parallel to or form an included angle with the first bending axis. The second bent portion causes the layers of the tab to converge toward the center of the second bent portion, increasing separation resistance and preventing the tab from branching.

[0009] In some embodiments, the battery cell further includes a housing, an end cap, and a depressing structure, the housing having an opening, the end cap being disposed in the opening to close the opening, the tab extending from the body toward the end cap, the depressing structure being disposed between the tab and the end cap and abutting against the tab to form a second bent portion in the tab. The depressing structure disposed between the tab and the end cap can continuously abut against the tab to maintain the shape of the second bent portion on the tab after the battery cell is mounted, effectively ensuring a continuous convergence effect between the tab sheets of each layer of the tab and preventing the tab from branching.

[0010] In some embodiments, the battery cell further includes a post provided on the end cap and an intermediate sheet for connecting the post and the straight portion of the tab, and a depressing structure is provided at the portion where the intermediate sheet and the straight portion are mated. By providing the depressing structure on the intermediate sheet and at the portion where the intermediate sheet and the straight portion are mated, the depressing structure can naturally form a depressing force on the tab after the intermediate sheet and the straight portion of the tab are connected, making it convenient to mount the battery cell.

[0011] In some embodiments, the battery cell further includes a post provided on the end cap and an intermediate sheet for connecting the post and the straight portion of the tab, and a pressing structure is provided at the portion where the intermediate sheet, the straight portion, and the first bent portion are fitted together. By providing the pressing structure at the portion where the intermediate sheet, the straight portion, and the first bent portion are fitted together, and by forming a second bent portion on both the straight portion and the first bent portion of the tab, the area where the tab is restrained is increased, further preventing the tab from branching.

[0012] In some embodiments, the push-down structure includes a protrusion provided on the relay plate, which abuts against the upper surface of the tab and causes the tab to form a second bent portion toward the main body.

[0013] In some embodiments, the height of the protrusion is 1 mm to 5 mm. By setting the height of the protrusion within this range, it is possible to ensure that the protruding depth of the second bent portion formed by the tab effectively binds the layers of the tab sheet.

[0014] In some embodiments, the height of the protrusion gradually increases from the first bent portion to the straight portion, because the free end of the straight portion is more susceptible to deformation, thereby creating a greater restraining force.

[0015] In some embodiments, the protrusions are integrally molded with the relay sheet. By integrally molding the protrusions with the relay sheet, when mounting the battery cells, the relay sheet and the tabs are directly connected, and at the same time, the protrusions can abut against the tabs to form the second bent portions, simplifying the process of mounting the battery cells.

[0016] In some embodiments, the protrusions and the relay sheet are separate structures, but the protrusions are connected to the relay sheet, which allows the position of the protrusions on the relay sheet to be changed during installation according to actual needs.

[0017] In some embodiments, the protrusion has a contact surface that contacts the tab, and the contact surface includes a curved surface. Since the contact surface directly contacts the tab, by making the contact surface curved, it is possible to avoid damaging the tab when contacting the tab.

[0018] In some embodiments, the relay sheet includes a first connection region connected to the post and a second connection region connected to the tab, and the depressing structure and the first connection region are located on both sides of the second connection region. When the depressing structure and the first connection region are located on both sides of the second connection region, respectively, the provision of the depressing structure allows the relay sheet to be connected to the post and tab in the original process during mounting without affecting the connection between the relay sheet and the post and tab, and the depressing structure provided on the relay sheet can naturally form abutment against the tab.

[0019] In some embodiments, the relay sheet includes a first connection region connected to the post, and second and third connection regions connected to the tab, and the depressing structure is located between the second and third connection regions. When the depressing structure is located between the second and third connection regions, both sides of the depressing structure receive the connection force between the relay sheet and the tab, and are restricted by the connection forces on both sides, so that the depressing structure has little freedom in the height direction and can continuously maintain contact with the tab.

[0020] In some embodiments, the battery cell further includes a post provided on the end cap and an intermediate sheet for connecting the post and the tab, and a depressing structure is provided on the side of the end cap facing the tab and at a position not covered by the intermediate sheet. When the end cap is provided with the depressing structure, the depressing structure can abut against the tab so as to form the second bent portion when the end cap is attached to the opening of the housing.

[0021] In some embodiments, the depressing structure contacts a portion of the tab near the tab center along the first bending axis, so that the second bent portion formed by the depressing structure is positioned at the tab center in the first direction, thereby providing a more balanced binding force on both sides of the second bent portion of the tab, and ensuring that each portion of the tab receives a balanced binding force.

[0022] In some embodiments, the battery cell includes two or more electrode assemblies arranged side by side, and the hold-down structure abuts against at least two tabs of the two or more electrode assemblies. When the hold-down structure abuts against at least two tabs of the two or more electrode assemblies, there is no need to provide a dedicated hold-down structure for each tab, which further simplifies the battery cell mounting process and the battery cell structure.

[0023] In some embodiments, the electrode assembly includes a positive electrode tab and a negative electrode tab, and the straight portions of the positive electrode tab and the negative electrode tab each have a second bent portion formed thereon. The second bent portions formed in the straight portions of the positive electrode tab and the negative electrode tab each effectively prevent the positive electrode tab and the negative electrode tab from branching, further improving the safety of the battery cell.

[0024] According to a second aspect, the present application provides a battery including a battery cell according to the above embodiment.

[0025] According to a third aspect, the present application provides a power receiving device including a battery according to any of the above embodiments for supplying power.

[0026] According to a fourth aspect, the present application provides a method for manufacturing a battery cell, comprising the steps of:

[0027] A step of providing an electrode assembly, the electrode assembly including a main body portion and a tab, the tab including a first bent portion and a straight portion connected to the main body portion via the first bent portion, and at least the straight portion having a second bent portion formed thereon that protrudes toward the main body portion.

[0028] In some embodiments, the manufacturing method further includes providing a housing having an opening, an end cap, and a hold-down structure disposed between the tab and the end cap; placing the electrode assembly in the housing such that the tab of the electrode assembly is positioned on the opening side of the housing; and abutting the hold-down structure against the tab to cause the tab to form a second bend when the end cap is attached to the opening of the housing to close the opening.

[0029] In some embodiments, the manufacturing method further includes providing a post and an intermediate sheet, connecting a first end of the intermediate sheet to the post, providing a hold-down structure on a second end of the intermediate sheet, and abutting the hold-down structure against the tab.

[0030] According to some embodiments, the manufacturing method further includes providing a hold-down structure on the end cap and attaching the end cap to the opening in the housing such that the hold-down structure abuts the tab.

[0031] The above description is merely a summary of the technical content of the present application, and in order to make the technical means of the present application more clearly understandable, it is possible to implement the present application according to the contents of the specification, and further to make the above and other objects, features and advantages of the present application more clearly understandable, the following provides a form for implementing the present application. [Brief explanation of the drawings]

[0032] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly introduces the accompanying drawings that need to be used in the embodiments of the present application. It is obvious that the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without making any inventive efforts.

[0033] [Figure 1] 1 is a schematic diagram of a vehicle according to some embodiments of the present application; [Figure 2] 1 is an exploded schematic diagram of a battery according to some embodiments of the present application. [Figure 3] 1 is a perspective schematic diagram of a battery cell according to some embodiments of the present application; [Figure 4] 1 is a schematic plan view of a battery cell according to some embodiments of the present application; [Figure 5] 1 is a schematic cross-sectional view taken along the AA direction of a battery cell according to some embodiments of the present application. [Figure 6] FIG. 6 is a partially enlarged schematic diagram of the N portion in FIG. 5. [Figure 7] 1 is a schematic front view of a battery cell according to some embodiments of the present application; [Figure 8] 1 is a schematic cross-sectional view taken along the CC direction of a battery cell according to some embodiments of the present application. FIG. [Figure 9]FIG. 9 is a partially enlarged schematic diagram of the N portion in FIG. 8. [Figure 10] 1 is a perspective schematic diagram of a tab according to some embodiments of the present application; [Figure 11] FIG. 2 is a schematic cross-sectional view taken along the AA direction of a battery cell according to another embodiment of the present invention. [Figure 12] FIG. 12 is a partially enlarged schematic diagram of a portion Q in FIG. 11. [Figure 13] FIG. 10 is a schematic cross-sectional view taken along the CC direction of a battery cell according to another embodiment of the present invention. [Figure 14] FIG. 14 is a partially enlarged schematic diagram of a portion P in FIG. 13. [Figure 15] 1 is a flowchart of a method for manufacturing a battery cell according to some embodiments of the present application.

[0034] In the drawings, the drawings are not drawn to scale.

[0035] The reference numerals in the drawings in the detailed description of the invention are as follows:

[0036] Vehicles 1000;

[0037] Battery 100, controller 200, motor 300;

[0038] Case 10, first part 11, second part 12;

[0039] Battery cell 20, housing 21, end cap 22, protrusion 221, electrode assembly 23, main body 231, tab 232, first bent portion 232a, straight portion 232b, second bent portion 232c, post 24, relay sheet 26, protrusion 261. DETAILED DESCRIPTION OF THE INVENTION

[0040] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are merely for the purpose of more clearly explaining the technical solution of the present application, and are for illustrative purposes only and do not limit the scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are used only for the purpose of describing specific examples and are not intended to limit the present application. The terms "comprises," "having," and any variations thereof in the present specification, claims, and the above description of the drawings are intended to cover a non-exclusive inclusion.

[0042] In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used only to distinguish between different objects, and are not to be understood as indicating or implying their relative importance, or as implying the number of constituent elements, a particular order, or a hierarchical relationship. In the description of the embodiments of the present application, unless otherwise clearly and specifically limited, "plurality" means two or more.

[0043] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it an independent or alternative embodiment that mutually excludes other embodiments. It should be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is merely a relational relationship for describing related objects, and indicates that three types of relationships can exist. For example, A and / or B can indicate three cases: only A exists, A and B exist simultaneously, and only B exists. In addition, the character " / " in this specification generally indicates that the related objects before and after it are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple sheets" refers to two or more sheets (including two sheets).

[0046] In describing the embodiments of the present application, directions or positional relationships indicated by technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" are based on the directions or positional relationships shown in the drawings and are intended merely to facilitate and simplify the description of the embodiments of the present application, and do not indicate or imply that the devices or elements shown necessarily have a specific orientation or must be configured or operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0047] In describing the embodiments of the present application, unless otherwise clearly specified and limited, terms such as "attached," "coupled," "connected," and "fixed" should be understood broadly, and may refer to, for example, a fixed connection, a detachable connection, or being integrated; a mechanical connection, an electrical connection; a direct connection, an indirect connection via an intermediate medium, or a communication relationship between two members or an interaction relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0048] Current battery cells typically include a housing and an electrode assembly housed within the housing, with the housing filled with an electrolyte. The electrode assembly is the component that generates the electrochemical reaction within the battery cell. The housing can contain one or more electrode assemblies. An electrode assembly is typically formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator typically disposed between the positive and negative electrode sheets. The active material-containing portions of the positive and negative electrode sheets form the main body of the electrode assembly, while the non-active material portions of the positive and negative electrode sheets form tabs, respectively. To improve overcurrent capability, the tabs include multiple tab sheets stacked together. During charging and discharging of the battery cell, the positive and negative electrode active materials react with the electrolyte, and the tabs connect to posts to form a current circuit.

[0049] During battery cell processing, it is generally necessary to fold a tab having multiple tab sheets to save space and improve energy density. After being folded, the tab includes a first bent portion connected to the main body and a straight portion. During research, the inventors of the present application discovered that because the tab includes multiple tab sheets, the layers of the tab are prone to branching after being folded. This branching may cause the tab to be inserted backwards into the main body, resulting in a short circuit with the tab piece underneath, potentially causing a safety issue.

[0050] In order to alleviate the problem of the tabs being prone to branching, the inventors conducted research and discovered that by causing a protruding deformation in a portion of the tab, which forms a constraint on the tab and increases the separation resistance between the layers of the tab, branching of the tab can be prevented. After further research, the inventors discovered that by causing a protruding deformation in a portion of the tab toward the main body, branching of the tab can be prevented and an increase in the volume occupied by the electrode assembly can be avoided.

[0051] Based on this idea, the inventors conducted extensive research to solve the problem of tabs easily branching, and designed a battery cell in which at least the straight section has a second bent section formed that protrudes toward the main body. The provision of the second bent section causes a portion of the tab to protrude toward the main body, which closes the gap between the tab layers, forming a local constraint on the tab, increasing the separation resistance between the tab layers and further preventing the tab from branching.

[0052] The battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, power receiving devices for vehicles, ships, aircraft, etc. The power supply system of the power receiving device can be configured using a device equipped with the battery cells, batteries, etc. disclosed in the present application.

[0053] An embodiment of the present application provides a battery-powered power receiving device, which may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a steamship, a spacecraft, etc. Here, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric steamship toy, and an electric airplane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spaceship, etc.

[0054] For convenience of explanation, the following embodiment will be described using an example in which the power receiving device according to an embodiment of the present application is a vehicle 1000.

[0055] Referring to FIG. 1, FIG. 1 is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to cause the motor 300 to supply power, for example, for starting, navigation, or operating power needs during driving of the vehicle 1000.

[0056] In some embodiments of the present application, the battery 100 is not only used as an operating power source for the vehicle 1000, but can also supply driving power to the vehicle 1000 as a driving power source for the vehicle 1000 in place of fuel oil or natural gas or in place of a portion of the fuel oil or natural gas.

[0057] Referring to FIG. 2, FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a case 10 and battery cells 20. The battery cells 20 are housed within the case 10. Here, the case 10 provides a storage space for the battery cells 20 and can have various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12 that are covered with a cover and together define a storage space for housing the battery cells 20. The second portion 12 may have a hollow structure with one end open, and the first portion 11 may have a plate-like structure, with the first portion 11 covered on the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the storage space. The first part 11 and the second part 12 each have a hollow structure with one side open, and the open side of the first part 11 may be covered by the open side of the second part 12. Of course, the case 10 formed by the first part 11 and the second part 12 may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0058] The battery 100 may include a plurality of battery cells 20, and the plurality of battery cells 20 may be connected in series, parallel, or series-parallel, where series-parallel means that some of the plurality of battery cells 20 are connected in series and some in parallel. The plurality of battery cells 20 may be connected in direct series, parallel, or series-parallel, and then the entire battery cell set may be housed within the case 10. Of course, the battery 100 may also be configured such that the plurality of battery cells 20 are first connected in series, parallel, or series-parallel to form a battery module, and the plurality of battery modules may then be further connected in series, parallel, or series-parallel to be integrated and housed within the case 10. The battery 100 may further include other structures, for example, the battery 100 may further include bus bar members for achieving electrical connection between the plurality of battery cells 20.

[0059] Here, each battery cell 20 may be a secondary battery or a primary battery, and may further be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 20 may have a cylindrical, flat, rectangular, or other shape.

[0060] 3, which is a perspective schematic diagram of a battery cell 20 provided in some embodiments of the present application. Referring to FIG. 5 in conjunction with FIG. 3, the battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, posts 24, and other functional components.

[0061] The housing 21 is an assembly that forms an internal environment for the battery cell 20, and the formed internal environment can be used to house the electrode assembly 23, the electrolyte, and other components. The housing 21 may have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 21 can be determined depending on the specific shape and size of the electrode assembly 23. The housing 21 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the embodiments of the present application are not particularly limited thereto.

[0062] The end cap 22 is a component that covers the opening of the housing 21 and isolates the internal environment of the battery cell 20 from the external environment. The shape of the end cap 22 may be adapted to the shape of the housing 21, without limitation. Optionally, the end cap 22 may be made of a material with a certain degree of hardness and strength (e.g., aluminum alloy) to prevent deformation when subjected to a pressure collision, thereby providing the battery cell 20 with increased structural strength and improved safety. The end cap 22 may also be provided with a functional component such as a post 24. The post 24 is used to electrically connect with the electrode assembly 23 to output or input power to the battery cell 20. In some embodiments, the end cap 22 may further be provided with a pressure relief mechanism that releases internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 22 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, but the embodiments of the present application are not particularly limited thereto. In some embodiments, an insulating member may be further provided inside the end cap 22, and the insulating member may be used to isolate the end cap 22 from the electrical connections in the housing 21 so as to reduce the risk of short circuits. Illustratively, the insulating member may be plastic, rubber, or the like.

[0063] The housing 21 and the end cap 22 may be separate components. However, the housing 21 and the end cap 22 may be integrated, and specifically, before other components are placed in the housing 21, a common connecting surface may first be formed between the housing 21 and the end cap 22, and then, when it is necessary to seal the interior of the housing 21, the end cap 22 may be closed onto the housing 21.

[0064] The electrode assembly 23 is a component that generates an electrochemical reaction within the battery cell 20. One or more electrode assemblies 23 may be included within the housing 21. The electrode assembly 23 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and typically has a separator between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body 231 of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material constitute the tab 232, respectively. To improve overcurrent capability, the tab 232 includes multiple tab sheets stacked together. During battery charging and discharging, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 232 connects to the post 24 to form a current circuit.

[0065] Referring to FIGS. 3 and 4, and further to FIGS. 5 to 10, FIG. 3 shows a schematic perspective view of a battery cell 20 according to some embodiments of the present application. FIG. 4 shows a schematic plan view of the battery cell 20 shown in FIG. 3, and FIG. 5 shows a schematic cross-sectional view of the battery cell according to some embodiments of the present application along the AA direction. FIG. 6 shows a partially enlarged schematic view of the N portion in FIG. 5. FIG. 7 shows a schematic front view of the battery cell 20 shown in FIG. 3. FIG. 8 shows a schematic cross-sectional view of the battery cell according to some embodiments of the present application along the CC direction. FIG. 9 shows a partially enlarged schematic view of the M portion in FIG. 8. FIG. 10 shows a schematic perspective view of a tab of an electrode assembly according to some embodiments of the present application.

[0066] The present application provides a battery cell 20. The battery cell 20 includes an electrode assembly 23. The electrode assembly 23 includes a main body 231 and a tab 232 that protrudes from the main body 231 toward the end cap 22. The tab 232 is formed by folding a plurality of stacked tab sheets. The tab 232 includes a first bent portion 232a and a straight portion 232b. The straight portion 232b is connected to the main body 231 via the first bent portion 232a. At least the straight portion 232b is formed with a second bent portion 232c that protrudes toward the main body 231.

[0067] As shown in FIG. 3, the first direction X in the drawing is the longitudinal direction of the battery cell 20, the second direction Y is the thickness direction of the battery cell 20, and the third direction Z is the height direction of the battery cell 20.

[0068] Referring to FIGS. 4 and 5 , the electrode assembly 23 includes two tabs 232 of opposite polarities extending from one side of the body portion 231, respectively designated as a positive electrode tab and a negative electrode tab. In other embodiments, the two tabs 232 may extend from both ends of the body portion 231. In the embodiments shown in FIGS. 5 and 6 , the two tabs 232 have the same structure, and therefore, for ease of explanation, the reference numerals for the two tabs are not distinguished. However, it should be noted that in other embodiments, the structure of the negative electrode tab may differ from the structure of the positive electrode tab. For example, the positive electrode tab may have a second bent portion but the negative electrode tab does not, or the negative electrode tab may have a second bent portion but the positive electrode tab does not. That is, in some embodiments, a second bent portion is formed on the straight portion of at least one of the positive electrode tab and the negative electrode tab.

[0069] By providing the second bent portion 232c, a part of the tab 232 is deformed to protrude toward the main body portion 231, and this deformation closes the gap between the layers of the tab 232, locally restraining the tab 232 and increasing the separation resistance between the layers of the tab 232, further preventing the tab from branching, thereby improving the safety of the battery.

[0070] 10, the second bent portion 232c is formed on the straight portion 232b and extends through the straight portion 232b, that is, from the free end of the straight portion 232b to the connection point between the straight portion 232b and the first bent portion 232a.

[0071] According to some embodiments of the present application, the second bent portion 232c is formed in the straight portion 232b and the first bent portion 232a, that is, the second bent portion 232c extends from the straight portion 232b to the first bent portion 232a.

[0072] The second bent portion 232c is formed on both the straight portion 232b and the first bent portion 232a, so that the area where the tab is constrained is increased, further preventing the tab from branching.

[0073] 10, according to some embodiments of the present application, the first bent portion 232a has a first bending axis, the second bent portion 232a has a second bending axis, and the second bending axis and the first bending axis are parallel or form an included angle therebetween.

[0074] 10 , the first bending axis of the first bending portion 232a extends along the first direction X. By bending the tab 232 along the first bending axis, the space occupied by the tab 232 in the height direction of the electrode assembly 23 can be reduced. In some embodiments, the second bending axis and the first bending axis are parallel to each other, i.e., the second bending axis also extends along the first direction X. In this case, the second bending portion 232c on the tab protrudes downward, forming a constraint on the tab, increasing the separation resistance between the layers of the tab and preventing the tab from bifurcation. In other embodiments, the second bending axis and the first bending axis form an included angle. For example, the second bending axis is disposed obliquely or perpendicular to the first bending axis. The second bent portion 232c thus formed allows the gaps between the layers of the tab to converge at the center of the second bent portion 232c, increasing the separation resistance and preventing the tab from branching.

[0075] 10 , in some embodiments, the second bent portion 232c may be formed by processing the tab using a preforming device before mounting the battery cell, such as by pressing a portion of the tab toward the main body using a press or by clamping both sides of the tab together using a specially shaped jig. In this case, because the second bent portion 232c on the tab 232 is formed through preforming, the direction in which the tab 232 protrudes is not limited; for example, the tab may protrude from the main body toward the end cap or at both ends.

[0076] In another embodiment, the second bend 232c is formed during the mounting of the battery cell, that is, the battery cell includes a depressing structure for causing the tab to form the second bend.

[0077] 5 and 6, according to some embodiments of the present application, the battery cell 20 further includes a housing 21, an end cap 22, and a push-down structure. The housing 21 has an opening, and the end cap 22 is provided in the opening to close the opening. The tab 232 protrudes from the main body 231 toward the end cap 22. The push-down structure is provided between the tab 232 and the end cap 22. The push-down structure abuts against the tab 232 to cause the tab 232 to form the second bent portion 232c.

[0078] The pressing structure is provided between the tab 232 and the end cap 22. That is, by providing the pressing structure above the tab 232, the pressing structure can be kept in contact with the tab after the battery cell 20 has been mounted, so that the shape of the second bent portion 232c on the tab 232 is maintained. This further effectively ensures a continuous convergence effect between the tab sheets of each layer of the tab 232, and prevents the tab from branching.

[0079] In some embodiments of the present application, referring to FIG. 5, the battery cell 20 further includes a post 24 provided on the end cap 22 and an intermediary sheet 26 for connecting the post 24 and the straight portion 232b of the tab 232, and a pressing structure is provided at the portion where the intermediary sheet 26 and the straight portion 232b are fitted together.

[0080] Specifically, as shown in Fig. 5, this battery cell 20 includes two posts 24 attached to the end cap 22. The two posts 24 are connected to two tabs 232 via two relay sheets 26, respectively. As shown in Figs. 5 and 6, a push-down structure is provided at the end of each of the two relay sheets 26. As shown in Figs. 6 to 10, the push-down structure forms a second bent portion 232c in the straight portion 232b of the tab 232.

[0081] The relay sheet 26 is a component for connecting the post 24 and the tab 232. If a push-down structure is provided on the relay sheet 26 and at the location where the relay sheet 26 and the straight portion 232b are fitted together, then after the relay sheet 26 and the straight portion 232b of the tab 232 are connected, the push-down structure can naturally form a push-down on the tab 232, and such an installation makes it easy to mount the battery cell 20.

[0082] According to some embodiments of the present application, referring to FIG. 6, the hold-down structure includes a protrusion 261 provided on the relay plate.

[0083] 6, the protrusion 261 is provided on the lower surface of the relay sheet 26 and protrudes toward the main body portion side. This protrusion 261 abuts against the upper surface of the tab 232, and further causes the tab 232 to form a second bent portion 232c toward the main body portion 231 side.

[0084] According to some embodiments of the present application, the height of the protrusion 261 is between 1 mm and 5 mm.

[0085] The height of the protrusion 262 refers to the distance between the bottom end of the protrusion 261 and the underside of the relay sheet 26. By setting the height of the protrusion 261 within the above range, the protrusion depth of the second bent portion formed by the tab can ensure effective binding between the layers of the tab sheet. If the height of the protrusion 261 is less than 1 mm, the protrusion depth of the second bent portion 232c formed by the abutment of the protrusion 261 will be small, and the binding force will also be small, making it difficult to effectively prevent the tab from branching. If the height of the protrusion 261 exceeds 5 mm, the protrusion depth of the second bent portion 232c formed by the protrusion 261 will be large, and the second bent portion 232c will protrude to a position where it contacts the main body portion 231, which may actually cause a short circuit with the main body portion 231.

[0086] According to some embodiments of the present application, the height of the protrusion 261 gradually increases in the direction from the first bent portion 232a to the straight portion 232b.

[0087] Since the free end of the straight portion 232b is more likely to disperse, the height of the protrusion 261 is gradually increased in the direction from the first bent portion 232a to the straight portion 232b in order to increase the deformation of the free end side of the straight portion 232b and create a greater restraining force.

[0088] According to some embodiments of the present application, the protrusions 261 are integrally formed with the relay sheet 26 .

[0089] 6, the protrusion 261 is formed by bending the end of the relay sheet 26. In another embodiment, when the relay sheet is manufactured, one protrusion may be integrally formed directly on the lower surface of the relay sheet.

[0090] By integrally molding the protrusion 261 and the relay sheet 26, when mounting the battery cell 20, the relay sheet 26 and the tab 232 can be directly connected, and at the same time, the protrusion 261 can be brought into contact with the tab 232 so as to form the second bent portion 232c, thereby simplifying the process of mounting the battery cell.

[0091] According to some embodiments of the present application, the protrusions 261 and the relay sheet 26 are separate structures, but the protrusions 261 are connected to the relay sheet 26. Specifically, the protrusions 261 can be connected to the relay sheet 26 by adhesion or other connection methods.

[0092] When the protrusion 261 and the relay sheet 26 are separate, the position of the protrusion 261 on the relay sheet 26 can be changed during implementation according to actual needs. For example, if the relay sheet 26 includes a first connection region connected to the post 24 and a second connection region connected to the tab 232, the protrusion 261 can be provided on the second connection region side according to needs. In other words, in this case, the protrusion 261 and the first connection region are located on both sides of the second connection region, respectively. Furthermore, for example, if the relay sheet 26 may further include a second connection region and a third connection region connected to the tab 232 and spaced apart, the protrusion 261 can be provided between the second connection region and the third connection region according to needs.

[0093] According to some embodiments of the present application, the protrusion 261 has a contact surface that abuts the tab 232, and the contact surface includes a curved surface.

[0094] The protrusion 261 here has a contact surface that contacts the tab, and the contact surface includes a curved surface, meaning that the portion that contacts the tab is curved. The entire protrusion may be curved, or a portion may be curved and the remaining portion may be flat. For example, in the embodiment shown in FIG. 6, the protrusion 261 is formed by bending the end of the relay sheet 26 into a U-shape, and in this case, the lower end of the outer surface of the protrusion is curved and the upper end is flat. In other embodiments, the outer surface of the protrusion 261 may also be spherical.

[0095] This contact surface comes into direct contact with the tab 232, so by making this contact surface a curved surface, it is possible to avoid damaging the tab 232 when it comes into contact with the tab 232.

[0096] According to some embodiments of the present application, the relay sheet 26 includes a first connection area connected to the post 24 and a second connection area connected to the tab 232, with the push-down structure and the first connection area located on either side of the second connection area.

[0097] Referring to Figure 5, the relay sheet 26 extends along a first direction, a first connection area near a first end of the relay sheet 26 is connected to a post 24, a push-down structure is provided at a second end of the relay sheet 26, and a second connection area near the second end of the relay sheet 26 is connected to a tab 232, that is, the push-down structure and the first connection area are located on both sides of the second connection area.

[0098] When the push-down structure and the first connection area are located on either side of the second connection area, the provision of the push-down structure allows the relay sheet 26, post 24 and tab 232 to be connected in the original process during implementation without affecting the connection between the relay sheet 26 and the post 24 and tab 232, and the push-down structure provided on the relay sheet 26 can naturally form abutment against the tab 232.

[0099] According to some embodiments of the present application, the relay sheet 26 includes a first connection region connected to the post 24, a second connection region connected to the tab 232, and a third connection region, and a push-down structure is located between the second connection region and the third connection region.

[0100] The relay sheet 26 has two connection areas that are both connected to the tab 232 and are spaced apart, the two connection areas being the second connection area and the third connection area, respectively. When the push-down structure is provided between the second connection area and the third connection area, both sides of the push-down structure are subjected to the connection force between the relay sheet 26 and the tab 232, and are restricted by the connection forces on both sides, so that the degree of freedom of the push-down structure in the height direction is small, and therefore it can maintain contact with the tab continuously.

[0101] In another embodiment in which the tab is processed using a pre-forming device to form the second bend, the second bend can be provided between two areas corresponding to the second and third connection areas of the tab, which reduces the degree of freedom of displacement of the second bend in the height direction of the tab, thereby more effectively maintaining the bent shape.

[0102] In some embodiments of the present application, the battery cell 20 further includes a post provided on the end cap 22 and an intermediary sheet 26 for connecting the post and the straight portion of the tab, and a push-down structure is provided at the portion where the intermediary sheet 26 is fitted with the straight portion and the first bent portion 232c.

[0103] A push-down structure is provided at the portion where the relay sheet 26 is fitted to the straight portion 232b and the first bent portion 232a, and the second bent portion 232c is formed on both the straight portion 232b and the first bent portion 232a of the tab, so that the area where the tab is constrained is wider, further preventing the tab from branching.

[0104] 11 to 14, in some embodiments of the present application, the battery cell 20 further includes a post 24 provided on the end cap 22 and an intermediate sheet 26 for connecting the post 24 and the tab 232, and a push-down structure is provided on the side of the end cap 22 facing the tab 232 at a position that is not shielded by the intermediate sheet 26.

[0105] As shown in FIGS. 11 and 12 , the battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, and two posts 24 provided on the end cap 22. The electrode assembly 23 includes a main body 231 and two tabs 232. The two tabs 232 have opposite polarities and both protrude from one side of the main body 231. The two tabs 232 are each connected to a corresponding post 24 via an intermediate sheet 26. A depressing structure is provided on the side (underside) of the end cap 22 facing the tabs. As shown in FIG. 11 , the depressing structure is provided in a position that is not shielded by the intermediate sheet 26. In other words, the depressing structure and the intermediate sheet 26 are provided at a distance from each other. Specifically, the depressing structure is provided on one side of the intermediate sheet 26. Two depressing structures are provided on the underside of the end cap 22 corresponding to the two tabs 232.

[0106] If the end cap 22 is provided with a push-down structure, when the end cap 22 is attached to the opening of the housing 21, the push-down structure can abut against the tab so as to form a second bent portion in the tab.

[0107] In some embodiments, the hold-down structure is separate from the end cap. In other embodiments, the hold-down structure is integral with the end cap.

[0108] In some embodiments, the hold-down structure is a ridge on the end cap.

[0109] According to some embodiments of the present application, referring to FIG. 10, the depressing structure abuts against a portion of the tab near the center of the tab along the direction of the first bending axis.

[0110] In the first direction X, when the push-down structure abuts against a portion of the tab close to the center of the tab so that the second bent portion 232c formed by the push-down structure is positioned at the center of the tab, the restraining forces received by both sides of the second bent portion 232c of the tab are more balanced, and further, each part of the tab can receive the restraining forces in a balanced manner.

[0111] According to some embodiments of the present application, the battery cell 20 includes two or more side-by-side electrode assemblies 23. The hold-down structure abuts against at least two tabs of the two or more electrode assemblies.

[0112] 8 and 9, the battery cell 20 includes two electrode assemblies 23. The tabs 232 of the two electrode assemblies 23 both protrude toward the end cap 22. As shown in FIG. 9, the tabs 232 of the two electrode assemblies 23 are arranged opposite each other so that, when folded along the first folding axis, the free ends of the straight portions of the two tabs 232 both face the center of the battery cell 20. The relay sheet 26 is connected to both of the two tabs 232 of the two electrode assemblies 23, and the pressing structures on the relay sheet 26 abut against both of the two tabs 232 of the two electrode assemblies 23. As shown in FIG. 10, both of the two tabs 232 abut against the relay sheet 26, thereby forming a second folding portion.

[0113] When the push-down structure abuts against at least two tabs of two or more electrode assemblies, there is no need to provide a dedicated push-down structure for each tab, which further simplifies the battery cell mounting process and the battery cell structure.

[0114] According to some embodiments of the present application, the electrode assembly 23 includes a positive electrode tab and a negative electrode tab, and the straight portions of the positive electrode tab and the negative electrode tab each have a second bent portion formed thereon.

[0115] 5, the polarities of the two tabs 232 are opposite, being a positive electrode tab and a negative electrode tab, respectively. In addition, the relay sheets 26 connected to the two tabs 232 are both provided with a pressing structure, which further causes the two tabs 232 to each form a second bent portion.

[0116] When the straight portions of the positive electrode tab and the negative electrode tab are each provided with a second bent portion, the positive electrode tab and the negative electrode tab are effectively prevented from branching, further improving the safety of the battery cell.

[0117] According to some embodiments, the present application further provides a battery including a battery cell according to any of the above aspects.

[0118] According to some embodiments of the present application, the present application further provides a power receiving device including a battery according to any of the above aspects, and the battery is used to supply power to the power receiving device.

[0119] The power receiving device may be any of the above-mentioned battery-based devices or systems.

[0120] According to some embodiments of the present application, the present application further provides a method for manufacturing a battery cell, including the step of providing an electrode assembly 23 including a main body portion 231 and a tab 232 including a first bent portion 232a and a straight portion 232b. The straight portion 232b is connected to the main body portion 231 via the first bent portion 232a, and at least the straight portion 232b is formed with a second bent portion 232c that protrudes toward the main body portion 231.

[0121] By providing a second bend in the straight portion of the tab, a protruding deformation is caused in part of the tab toward the main body portion. This deformation closes the gap between the layers of the tab, forming a local constraint on the tab, increasing the separation resistance between the layers of the tab, and further preventing the tab from branching, improving the safety of the battery.

[0122] According to some embodiments of the present application, referring to FIG. 15, a method for manufacturing a battery cell includes the following steps.

[0123] S101 providing a housing 21 having an opening and an end cap 22;

[0124] providing an electrode assembly (23) (S102) including a main body (231) and a tab (232) including a first bent portion (232a) and a straight portion (232b), wherein the straight portion (232b) is connected to the main body (231) via the first bent portion (232a), and a second bent portion (232c) protruding toward the main body (231) is formed on at least the straight portion (232b);

[0125] S103: placing the electrode assembly 23 in the housing 21 so that the tab of the electrode assembly 23 is positioned on the opening side of the housing 21;

[0126] and S104 attaching the end cap 22 to the opening of the housing 21 so as to close the opening.

[0127] By providing a second bend in the straight portion of the tab, a protruding deformation is caused in part of the tab toward the main body portion. This deformation closes the gap between the layers of the tab, forming a local constraint on the tab, increasing the separation resistance between the layers of the tab, and further preventing the tab from branching, improving the safety of the battery.

[0128] The second bent portion 232c may be formed by processing the tab using a pre-forming device before the battery cell is mounted, for example, by pressing a portion of the tab down toward the main body using a press device, or by clamping both sides of the tab together using a specially shaped jig.

[0129] In another embodiment, the second bent portion 232c is formed during packaging of the battery cell. The manufacturing method further includes providing a hold-down structure, the hold-down structure being disposed between the tab 232 and the end cap 22, and abutting the tab 232 against the hold-down structure to cause the tab 232 to form the second bent portion 232c when the end cap 22 is attached to the opening of the housing 21 to close the opening.

[0130] According to some embodiments of the present application, the manufacturing method further includes providing a post 24 and an intermediate sheet 26, connecting a first end of the intermediate sheet 26 to the post 24, providing a pressing structure on a second end of the intermediate sheet 26, and abutting the pressing structure against the tab 232.

[0131] According to some embodiments of the present application, the manufacturing method further includes providing a hold-down structure on the end cap 22 and attaching the end cap 22 to the opening of the housing 21 such that the hold-down structure abuts against the tab 232 .

[0132] The structure of a battery cell according to a specific embodiment of the present invention will be described in detail below with reference to FIGS.

[0133] 3 to 10 show the structure of a battery cell according to one specific embodiment of the present application.

[0134] As shown in FIGS. 3 to 5 , in this embodiment, the battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, a post 24, and an intermediate sheet 26. The housing 21 is a rectangular housing with an opening, and the end cap 22 is provided in the opening of the housing 21 so as to close the housing 21. Two posts 24 are provided on the end cap 22. The electrode assembly 23 is housed inside the housing 21. The electrode assembly 23 includes a main body 231 and a tab 232 that protrudes from the main body 231 toward the end cap 22. The intermediate sheet 26 connects the post 24 and the tab 232.

[0135] 5 and 6, a protrusion 261 that forms a pressing structure is provided at the end of the relay sheet 26. The protrusion 261 is formed by bending the end of the relay sheet 26, that is, the protrusion 261 and the relay sheet 26 are integrally formed.

[0136] 7 to 9, the battery cell 20 includes two electrode assemblies 23 arranged side by side within the housing 21. The relay sheet 26 is simultaneously connected to the tabs 232 of the two electrode assemblies 23. Furthermore, as shown in FIG. 10, the protrusions 261 on the relay sheet 26 simultaneously abut against the straight portions 232b of the two tabs 232 of the two electrode assemblies 23, thereby forming second bent portions 232c in the straight portions 232b of the two tabs 232.

[0137] When the relay sheet 26 is a component for connecting the post 24 and the tab 232, after connecting the relay sheet 26 and the straight portion 232b of the tab 232, the protrusion 261 naturally presses down on the tab 232, forming a second bent portion 232c in the tab. By providing the second bent portion 232c, a portion of the tab 232 is deformed to protrude toward the main body 231. This deformation closes the gap between the layers of the tab 232, forming a local constraint on the tab 232, increasing the separation resistance between the layers of the tab 232 and preventing the tab from branching, improving battery safety. Furthermore, providing a press-down structure in the relay sheet simplifies mounting of the battery cell 20.

[0138] The method for manufacturing a battery cell according to this embodiment includes the following steps.

[0139] providing a housing 21 having an opening, an end cap 22, a post 24, and an intermediate sheet 26;

[0140] providing an electrode assembly 23 including a main body portion 231 and a tab 232, placing the electrode assembly 23 in a housing 21, connecting the relay sheet 26 and the tab 232, and bending the tab 232 along a first bending axis after the connection, so that the tab 232 after bending has a first bent portion 232a and a straight portion 232b connected to the main body portion 231 via the first bent portion 232a;

[0141] a step of abutting the straight portion 232b with a protrusion provided on the relay sheet 26 so as to form a second bent portion 232c that protrudes toward the main body portion 231 side in the straight portion 232b after bending;

[0142] and attaching the end cap 22 to the opening of the housing 21 so as to close the opening.

[0143] 11 to 14 show the structure of a battery cell according to another embodiment of the present invention.

[0144] The external structure of the battery cell according to this embodiment is the same as that of the above-described embodiment, and therefore will not be repeatedly illustrated. Therefore, reference can be made to Figures 3, 4, and 7, in which Figure 11 shows a cross-sectional view taken along the AA direction in Figure 4, and Figure 13 shows a cross-sectional view taken along the CC direction in Figure 7.

[0145] As shown in Fig. 11, this embodiment differs from the above-described embodiments in that the push-down structure according to this embodiment is provided in end cap 22. Specifically, as shown in Fig. 12, protrusion 221 is provided on the side of end cap 22 facing tab 232. If protrusion 221 is provided in a position that is not shielded by relay sheet 26, protrusion 221 can directly abut against the straight portion of tab 232 so as to form second bent portion 232c in the straight portion of tab 232 when end cap 22 is attached.

[0146] 13 and 14, this battery cell includes two electrode assemblies 23 arranged side by side within a housing 21. The protrusion 221 can simultaneously abut against the tabs 232 of the two electrode assemblies 23 so as to simultaneously form second bent portions 232c in the two tabs 232.

[0147] Specifically, the protrusion 221 is a ridge provided on the lower surface of the end cap 22, and the cross section of the protrusion 221 is semicircular.

[0148] The method for manufacturing a battery cell according to this embodiment includes the following steps.

[0149] providing a housing 21 having an opening, an end cap 22, a post 24, and an intermediate sheet 26;

[0150] providing an electrode assembly 23 including a main body portion 231 and a tab 232, placing the electrode assembly 23 in a housing 21, connecting the relay sheet 26 and the tab 232, and bending the tab 232 along a first bending axis after the connection, so that the tab 232 after bending has a first bent portion 232a and a straight portion 232b connected to the main body portion 231 via the first bent portion 232a;

[0151] The method includes a step of attaching the end cap 22 to the opening of the housing 21 so as to close the opening, and abutting the straight portion 232b against the protrusion 221 on the end cap 22 so as to form a second bent portion 232c in the straight portion 232b that protrudes toward the main body portion 231 side.

[0152] Finally, it should be noted that the above embodiments are merely intended to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified or some or all of the components therein may be equivalently replaced. These modifications or replacements should not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application and should be included in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the components referred to in the embodiments may be combined in any manner. The present application is not limited to the specific embodiments disclosed herein and includes all technical solutions falling within the scope of the claims.

Claims

1. The electrode assembly (23) includes a main body (231) and a tab (232) protruding from the main body (231), the tab (232) being formed by folding a plurality of stacked tab sheets, The tab (232) includes a first bent portion (232a) and a straight portion (232b) connected to the main body portion (231) via the first bent portion (232a), At least the straight portion (232b) is formed with a second bent portion (232c) that protrudes toward the main body portion (231), The first bent portion (232a) has a first bending axis, the second bent portion (232c) has a second bending axis, and there is an included angle between the second bending axis and the first bending axis; The second bending axis is a line formed in the second bending portion formed by pressing a part of the tab (232) down toward the main body portion (231). A battery cell characterized by:

2. A second bent portion (232c) is formed in the straight portion (232b) and the first bent portion (232a). The battery cell according to claim 1 .

3. The device further includes a housing (21), an end cap (22), and a push-down structure, wherein the housing (21) has an opening, the end cap (22) is provided in the opening so as to close the opening, the tab (232) protrudes from the main body portion (231) toward the end cap (22), the push-down structure is provided between the tab (232) and the end cap (22), and the push-down structure abuts against the tab (232) so as to form the second bent portion (232c) in the tab (232), The battery cell (20) further includes a post (24) provided on the end cap (22) and a relay sheet (26) for connecting the post (24) and the straight portion (232b) of the tab (232), and the push-down structure is provided at a portion where the relay sheet (26) and the straight portion (232b) are fitted together.

3. The battery cell according to claim 1 or 2.

4. The device further includes a housing (21), an end cap (22), and a push-down structure, wherein the housing (21) has an opening, the end cap (22) is provided in the opening so as to close the opening, the tab (232) protrudes from the main body portion (231) toward the end cap (22), the push-down structure is provided between the tab (232) and the end cap (22), and the push-down structure abuts against the tab (232) so as to form the second bent portion (232c) in the tab (232), The battery cell (20) further includes a post (24) provided on the end cap (22) and a relay sheet (26) for connecting the post (24) and the straight portion (232b) of the tab (232), and the push-down structure is provided at a portion where the relay sheet (26) is fitted to the straight portion (232b) and the first bent portion (232a).

3. The battery cell according to claim 1 or 2.

5. The pressing structure includes a protrusion (261) provided on the relay sheet (26).

5. The battery cell according to claim 3 or 4.

6. The height of the protrusion (261) is 1 mm to 5 mm. The battery cell according to claim 5 .

7. The height of the protrusion (261) gradually increases in a direction from the first bent portion (232a) to the straight portion (232b). The battery cell according to claim 5 .

8. The protrusion (261) is integrally formed with the relay sheet (26), or the protrusion (261) and the relay sheet (26) are separate structures, but the protrusion (261) is connected to the relay sheet (26). The battery cell according to claim 5 .

9. The protrusion (261) has a contact surface that abuts against the tab (232), and the contact surface includes a curved surface. The battery cell according to claim 5 .

10. The relay sheet (26) includes a first connection region connected to the post (24) and a second connection region connected to the tab (232), and the push-down structure and the first connection region are located on both sides of the second connection region.

5. The battery cell according to claim 3 or 4.

11. The relay sheet (26) includes a first connection region connected to the post (24), a second connection region connected to the tab (232), and a third connection region, and the push-down structure is located between the second connection region and the third connection region.

5. The battery cell according to claim 3 or 4.

12. The battery cell (20) further includes a post (24) provided on the end cap (22) and a relay sheet (26) for connecting the post (24) and the tab (232), and the push-down structure is provided on the side of the end cap (22) facing the tab (232) at a position not covered by the relay sheet (26). The battery cell according to claim 3 .

13. The pushing-down structure abuts against a portion of the tab (232) near the center of the tab along the direction of the first bending axis. The battery cell according to any one of claims 3 to 12.

14. The battery cell (20) includes two or more electrode assemblies (23) arranged side by side, and the push-down structure abuts against at least two tabs (232) of the two or more electrode assemblies (23). The battery cell according to any one of claims 3 to 13.

15. The electrode assembly (23) includes a positive electrode tab and a negative electrode tab, and a second bent portion is formed on the straight portion of each of the positive electrode tab and the negative electrode tab. The battery cell according to any one of claims 1 to 13.

16. A battery cell according to any one of claims 1 to 15, A battery characterized by:

17. 17. A battery according to claim 16 for supplying electrical power. A power receiving device characterized by:

18. providing an electrode assembly (23), the electrode assembly (23) including a main body portion (231) and a tab (232), the tab (232) including a first bent portion (232a) and a straight portion (232b) connected to the main body portion (231) via the first bent portion (232a), and at least the straight portion (232b) having a second bent portion (232c) protruding toward the main body portion (231); The first bent portion (232a) has a first bending axis, the second bent portion (232c) has a second bending axis, and there is an included angle between the second bending axis and the first bending axis; The second bending axis is a line formed in the second bending portion formed by pressing a part of the tab (232) down toward the main body portion (231). A method for manufacturing a battery cell comprising the steps of:

19. The method further includes the steps of providing a housing (21) having an opening, an end cap (22), and a push-down structure provided between the tab (232) and the end cap (22); placing the electrode assembly (23) in the housing (21) so that the tab (232) of the electrode assembly (23) is located on the opening side of the housing (21); and abutting the push-down structure against the tab (232) so that the tab (232) forms the second bent portion (232c) when the end cap (22) is attached to the opening of the housing (21) to close the opening. The method for manufacturing a battery cell according to claim 18 .

20. The method further includes providing a post (24) and an intermediate sheet (26), connecting a first end of the intermediate sheet (26) to the post (24), providing a depressing structure on a second end of the intermediate sheet (26), and abutting the depressing structure against the tab (232).

20. The method for manufacturing a battery cell according to claim 19.

21. The method further includes providing a depression structure on the end cap (22) and attaching the end cap (22) to the opening of the housing (21) so that the depression structure abuts against the tab (232).

20. The method for manufacturing a battery cell according to claim 19.

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