Battery cell, manufacturing method and manufacturing system thereof, battery, and electrical device

Abstract

An embodiment of the present application provides a battery cell, a manufacturing method and a manufacturing system thereof, a battery, and an electrical device. The battery cell of the embodiment of the present application includes: an electrode assembly including a first tab; a housing for accommodating the electrode assembly, the housing including a wall portion provided with an electrode lead-out hole; an electrode terminal mounted in the electrode lead-out hole; and a current collector member located between the wall portion and the first tab and used for connecting the electrode terminal and the first tab. The electrode terminal is fixed to the wall portion by forming a first recess at one end facing the first tab and folding the side wall of the first recess outward, and the current collector member abuts against and is connected to the bottom surface of the first recess. The present application can reduce the case difficulty of the electrode terminal and improve the assembly process of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technologies, and more particularly, to a battery cell, a manufacturing method and a manufacturing system thereof, a battery, and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells may include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technologies, how to improve the assembly process of battery cells has always been a research direction in the industry. Summary of the Invention

[0004] This application provides a battery cell, a manufacturing method and a manufacturing system thereof, an assembly method and an assembly device for a housing and an electrode terminal, a battery, and an electrical device, which can improve the assembly process of the battery cell.

[0005] In a first aspect, an embodiment of this application provides a battery cell, including: an electrode assembly including a first tab; a housing for accommodating the electrode assembly, the housing including a wall portion, and the wall portion being provided with an electrode lead-out hole; an electrode terminal installed in the electrode lead-out hole; and a current collector located between the wall portion and the first tab and used for connecting the electrode terminal and the first tab. The electrode terminal is fixed to the wall portion by forming a first recess at one end facing the first tab and turning outwards the side wall of the first recess, and the current collector abuts against and is connected to the bottom surface of the first recess.

[0006] In the above solution, by forming a first recess at one end of the electrode terminal facing the first tab and turning outwards the side wall of the first recess, the electrode terminal is fixed to the wall portion of the housing. The portion of the electrode terminal under pressure is the side wall of the first recess, and the side wall of the first recess is a wall-like structure and is easy to turn over, so that the pressure on the electrode terminal during the forming process can be reduced, the stress concentration can be reduced, and the installation difficulty of the electrode terminal can be reduced. During the process of fixing the electrode terminal to the wall portion, the side wall of the first recess is extruded by an external device, so that the risk of deformation of the bottom surface of the first recess during the turning-over of the side wall of the first recess can be reduced, thereby ensuring the close fit between the current collector and the bottom surface of the first recess and improving the connection strength between the current collector and the electrode terminal.

[0007] In some embodiments, the electrode terminal includes a retaining portion located on a side of the wall portion facing away from the first electrode tab; a main body portion connected to a surface of the retaining portion facing the wall portion and extending through the electrode lead-out hole; and a first recess and a flange structure formed by folding the sidewall of the first recess outwardly on the end of the main body portion facing the first electrode tab. The retaining portion and flange structure are used to clamp a portion of the wall portion to secure the electrode terminal to the wall portion.

[0008] In this embodiment, when assembling the housing and electrode terminal, the main body can be inserted into the housing from the outside, while the retaining portion can retain the electrode terminal from the outside. After the main body is inserted into the housing, the sidewalls of the first recess are folded outward to form a flange structure. The flange structure and the retaining portion respectively clamp the wall portion from both sides to secure the electrode terminal to the wall portion.

[0009] In some embodiments, in the radial direction of the wall portion, the size of the limiting portion is larger than the size of the flange structure.

[0010] In the above solution, the stopper can have a larger radial dimension, which facilitates assembly of the stopper and the external flow-collecting component, increases the connection area between the stopper and the flow-collecting component, and improves flow capacity. The flange structure has a smaller radial dimension, which reduces the pressure required for folding and forming, thereby reducing the difficulty of folding the flange structure.

[0011] In some embodiments, in the radial direction of the wall portion, the thickness of at least a portion of the flange structure starting from the outer end surface gradually increases from the outside to the inside.

[0012] In the above scheme, during the forming process of the flange structure, the part of the flange structure close to the outer end surface is first compressed; and the thickness of the part of the flange structure close to the outer end surface is relatively small and easier to fold, which can reduce the difficulty of forming the flange structure.

[0013] In some embodiments, at least a portion of a surface of the flange structure facing the first electrode tab is an inclined surface, and the inclined surface is connected to the outer end surface and tilted toward the electrode assembly.

[0014] In the above embodiment, by providing the inclined surface, the thickness of at least a portion of the flange structure starting from the outer end surface can be gradually increased from the outside to the inside. Before the flange structure is formed, the inclined surface is a portion of the inner wall surface of the side wall of the first recess, which can serve as a guide to facilitate the insertion of external equipment into the first recess.

[0015] In some embodiments, in a thickness direction of the wall portion, a bottom surface of the first recess is closer to the first tab than an inner surface of the wall portion.

[0016] During the process of folding the side wall of the first recess, the portion of the side wall of the first recess close to the bottom surface of the first recess will be deformed; if the bottom surface of the first recess is flush with the inner surface of the wall portion, or the bottom surface of the first recess is farther from the first tab than the inner surface of the wall portion, then the side wall of the first recess may squeeze the hole wall surface of the electrode lead-out hole during folding, causing the risk of deformation of the wall portion. In the above solution, the bottom surface of the first recess is closer to the first tab than the inner surface of the wall portion, so as to reduce the pressure exerted by the side wall of the first recess on the wall portion during folding and reduce the risk of the wall portion being crushed.

[0017] In some embodiments, the battery cell further includes a sealing member disposed between the wall portion and the electrode terminal and used for sealing the electrode lead-out hole.

[0018] In the above solution, the electrode lead-out hole is sealed by providing a sealing member, which can improve the sealing performance of the battery cell, reduce the risk of electrolyte leakage, and improve the safety of the battery cell.

[0019] In some embodiments, the sealing member includes a first sealing portion surrounding the outside of the body portion and located between the wall portion and the limiting portion. The electrode terminal further includes a first protrusion protruding from the surface of the limiting portion facing the first sealing portion and surrounding the body portion, and the first protrusion is used to press against the first sealing portion to seal the electrode lead-out hole; and / or, the sealing member further includes a second protrusion protruding from the surface of the first sealing portion facing the limiting portion and surrounding the body portion, and the second protrusion is used to press against the limiting portion to seal the electrode lead-out hole.

[0020] In the above solution, the first convex portion protrudes from the limiting portion. When the limiting portion and the wall portion clamp the first sealing portion, the first convex portion can be embedded into the first sealing portion, thereby increasing the local compression amount of the first sealing portion and improving the sealing performance. The second protrusion protrudes from the first sealing portion. When the limiting portion and the wall portion clamp the first sealing portion, the limiting portion will simultaneously compress the second protrusion and the first sealing portion, thereby increasing the compression amount of the sealing member at the second protrusion and improving the sealing performance.

[0021] In some embodiments, the projection of the first protrusion along the thickness direction of the wall portion is located within the projection of the flanging structure along the thickness direction, and / or, the projection of the second protrusion along the thickness direction of the wall portion is located within the projection of the flanging structure along the thickness direction.

[0022] In the above solution, the projection of the first protrusion along the thickness direction of the wall portion is located within the projection of the flanging structure along the thickness direction, so that the first protrusion and the flanging structure can clamp the first sealing portion from both sides to increase the compression amount of the first sealing portion and improve the sealing performance. The projection of the second protrusion along the thickness direction of the wall portion is located within the projection of the flanging structure along the thickness direction, so that the limiting portion and the flanging structure can clamp the second protrusion and the first sealing portion from both sides to increase the compression amount of the sealing member at the second protrusion and improve the sealing performance.

[0023] In some embodiments, in the radial direction of the wall portion, the minimum distance between the first protrusion and the body portion is less than the minimum distance between the first protrusion and the outer edge of the limiting portion; and / or, in the radial direction of the wall portion, the minimum distance between the second protrusion and the body portion is less than the minimum distance between the second protrusion and the outer edge of the limiting portion.

[0024] In the above solution, the minimum distance between the first protrusion and the body portion is less than the minimum distance between the first protrusion and the outer edge of the limiting portion, which can reduce the torque on the limiting portion and lower the risk of warping deformation of the limiting portion. The minimum distance between the second protrusion and the body portion is less than the minimum distance between the second protrusion and the outer edge of the limiting portion, which can reduce the torque on the limiting portion and lower the risk of warping deformation of the limiting portion.

[0025] In some embodiments, the sealing member further includes a second sealing portion, which is sleeved on the body portion and connected to the first sealing portion. A part of the second sealing portion is turned outwards under the extrusion of the flanging structure and clamped between the wall portion and the flanging structure.

[0026] In the above solution, the second sealing portion can not only improve the sealing performance, but also separate the body portion and the wall portion to prevent direct contact and friction between the body portion and the wall portion, thereby reducing the risk of generating particles.

[0027] In some embodiments, the electrode assembly further includes a second tab having a polarity opposite to that of the first tab, and the second tab is electrically connected to the wall portion. The sealing member insulates and separates the wall portion and the electrode terminal.

[0028] In the above solution, the sealing member insulates and separates the wall portion and the electrode terminal, so the wall portion and the electrode terminal can have different polarities. The wall portion and the electrode terminal can serve as the two output poles of the battery cell, which can simplify the structure of the battery cell and ensure the over-current capacity of the battery cell. The wall portion and the electrode terminal are located at the same end of the battery cell. In this way, the current collecting member can be assembled on the same side of the battery cell, which can simplify the assembly process and improve the efficiency of assembling multiple battery cells into a group.

[0029] In some embodiments, the current collecting member includes a first current collecting portion and a second current collecting portion connected to the first current collecting portion. The first current collecting portion is used to connect the first tab to electrically connect the current collecting member and the first tab, and the second current collecting portion is used to connect the electrode terminal to electrically connect the current collecting member and the electrode terminal. The second current collecting portion protrudes from the surface of the first current collecting portion facing the electrode terminal to extend into the first recess and abut against the bottom surface of the first recess.

[0030] In the above solution, the first current collecting portion can be connected to the first electrode tab to ensure the connection strength and current carrying capacity between the current collecting member and the first electrode tab. The second current collecting portion is protruding from the first current collecting portion and can extend into the first recess and abut against the bottom surface of the first recess, thereby ensuring a close fit between the current collecting member and the bottom surface of the first recess, and ensuring the current carrying capacity and connection strength between the electrode terminal and the current collecting member.

[0031] In some embodiments, a second recessed portion is formed at a position of the current collecting member corresponding to the second current collecting portion, the recessed portion being recessed from a surface of the first current collecting portion facing the first electrode tab in a direction away from the first electrode tab.

[0032] In the above solution, the provision of the second recess can reduce the strength of the second current collecting section and improve its elastic deformation capability. When the second current collecting section and the bottom surface of the first recess are aligned, the second current collecting section can release stress through elastic deformation, reducing the stress transmitted to the first tab and reducing the risk of the first tab being crushed.

[0033] In some embodiments, the first current collecting portion and the second current collecting portion are integrally formed.

[0034] The above solution can omit the connection process between the first current collecting part and the second current collecting part, and reduce the resistance between the two.

[0035] In some embodiments, the second header is a solid structure.

[0036] In the above solution, the second current collecting section is configured as a solid structure, which can improve the current carrying capacity of the second current collecting section. The second current collecting section can be welded to the electrode terminal by resistance welding. During the resistance welding process, the solid structure of the second current collecting section generates more heat, which facilitates the welding of the second current collecting section to the electrode terminal and reduces the difficulty of welding the second current collecting section to the electrode terminal.

[0037] In some embodiments, the first current collecting portion and the second current collecting portion are separate structures and are connected by welding.

[0038] In the above solution, the process of welding the first collecting part and the second collecting part is simple, which helps to save materials and reduce costs.

[0039] In some embodiments, the first current collecting portion is spaced apart from the electrode terminal in a thickness direction of the wall portion.

[0040] When assembling the electrode terminal and the current collector member, the second current collecting portion needs to be pressed against the bottom surface of the first recess; if the first current collecting portion also contacts the electrode terminal, there will be over-positioning between the electrode terminal and the current collector member, making it difficult to ensure that the second current collecting portion is in close contact with the bottom surface of the first recess. The above solution spaces the first current collecting portion from the electrode terminal to avoid the first current collecting portion interfering with the abutment of the second current collecting portion against the bottom surface of the first recess and ensure the connection strength between the current collector member and the electrode terminal.

[0041] In some embodiments, the first current collecting portion abuts against and is welded to the first tab, and the second current collecting portion abuts against and is welded to the bottom surface of the first recess.

[0042] In the above solution, welding can reduce the contact resistance between the first current collecting portion and the first tab and the contact resistance between the second current collecting portion and the electrode terminal, improving the over-current capacity.

[0043] In some embodiments, the electrode assembly has a winding center hole configured to correspond to the position of the second current collecting portion and for an external welding component to pass through to weld the second current collecting portion to the bottom surface of the first recess.

[0044] In the above solution, the winding center hole can provide a clearance space for the external welding component so that the external welding component can pass through the electrode assembly and weld the second current collecting portion to the bottom surface of the first recess.

[0045] In some embodiments, a conductive adhesive is provided in the first recess, and the conductive adhesive connects the second current collecting portion and the electrode terminal to achieve electrical connection between the current collector member and the electrode terminal.

[0046] In the above solution, by connecting the second current collecting portion and the electrode terminal with a conductive adhesive to replace the way of welding the second current collecting portion and the electrode terminal, the connection difficulty between the second current collecting portion and the electrode terminal can be reduced.

[0047] In some embodiments, the battery cell further includes an insulating sheet, and the insulating sheet surrounds the outside of the second current collecting portion and is at least partially clamped between the first current collecting portion and the electrode terminal.

[0048] In the above solution, by providing an insulating sheet clamped between the first current collecting portion and the electrode terminal, the sealing of the first recess can be achieved and the risk of leakage of substances in the first recess can be reduced.

[0049] In some embodiments, the insulating sheet is elastic and configured to elastically deform when squeezed by the first current collecting portion and the electrode terminal.

[0050] During the process of pressing the second current collecting part against the bottom surface of the first concave part, the electrode terminal will squeeze the insulating sheet. In the above solution, the insulating sheet can be elastically deformed to avoid interference of the insulating sheet with the abutment between the second current collecting part and the bottom surface of the first concave part, and ensure the connection strength between the current collecting member and the electrode terminal.

[0051] In some embodiments, the surface of the electrode terminal facing away from the first tab is a flat surface.

[0052] In the above solution, the surface of the electrode terminal facing away from the first tab can be used to connect with an external bus bar component, and the flat surface can ensure close contact between the electrode terminal and the bus bar component, simplify the assembly process of the electrode terminal and the bus bar component, and improve the connection strength and current-carrying capacity between the electrode terminal and the bus bar component.

[0053] In some embodiments, the bottom surface of the first concave part is a flat surface.

[0054] In the above solution, the current collecting member is used to abut against the bottom surface of the first concave part, and setting the bottom surface of the first concave part as a flat surface can make the current collecting member in close contact with the bottom surface of the first concave part, and improve the connection strength and current-carrying capacity between the two.

[0055] In some embodiments, the housing includes a cover plate and a housing body. The housing body includes a housing side wall and a housing bottom wall formed integrally. The housing side wall surrounds the housing bottom wall. One end of the housing side wall is connected to the housing bottom wall, and the other end of the housing side wall encloses an opening opposite to the housing bottom wall. The cover plate covers the opening. The wall part is the housing bottom wall or the cover plate.

[0056] In a second aspect, an embodiment of the present application provides a battery, including a plurality of battery cells according to any one of the embodiments of the first aspect.

[0057] In a third aspect, an embodiment of the present application provides an electrical device, including the battery of the second aspect, and the battery is used to provide electrical energy.

[0058] In a fourth aspect, an embodiment of the present application provides an assembly method of a housing and an electrode terminal, including:

[0059] Providing a housing, the housing includes a housing side wall and a housing bottom wall formed integrally. The housing side wall surrounds the housing bottom wall. One end of the housing side wall is connected to the housing bottom wall, and the other end of the housing side wall encloses an opening opposite to the housing bottom wall. The housing bottom wall is provided with an electrode lead-out hole;

[0060] Providing an electrode terminal, one end of the electrode terminal is provided with a first concave part;

[0061] Installing the electrode terminal in the electrode lead-out hole, and making the end of the electrode terminal provided with the first concave part extend into the housing, and then folding the side wall of the first concave part outwards to fix the electrode terminal to the housing bottom wall.

[0062] In some embodiments, the step of folding the side wall of the first recess outwards includes: inserting a first pressing block into the first recess and expanding the side wall of the first recess to make the side wall of the first recess incline outwards; using a second pressing block to squeeze the side wall of the first recess to make the side wall of the first recess fold towards the bottom wall of the housing.

[0063] In the above solution, after the first pressing block is inserted into the first recess, the side wall of the first recess is gradually expanded to make the side wall of the first recess incline outwards. After the side wall of the first recess inclines outwards, the second pressing block can more easily press against the inner wall surface of the side wall of the first recess, so that the side wall of the first recess can be bent along a preset direction.

[0064] In a fifth aspect, an assembly device for a housing and an electrode terminal provided by an embodiment of the present application includes:

[0065] A first providing device for providing a housing, the housing includes a housing side wall and a housing bottom wall formed integrally, the housing side wall surrounds the housing bottom wall, one end of the housing side wall is connected to the housing bottom wall, the other end of the housing side wall encloses an opening opposite to the housing bottom wall, and the housing bottom wall is provided with an electrode lead-out hole;

[0066] A second providing device for providing an electrode terminal, one end of the electrode terminal is provided with a first recess;

[0067] A first assembling component for installing the electrode terminal in the electrode lead-out hole, and making the end of the electrode terminal provided with the first recess extend into the housing, and then folding the side wall of the first recess of the housing outwards to fix the electrode terminal to the housing bottom wall.

[0068] In some embodiments, the first assembling component includes a first pressing block and a second pressing block, the first pressing block is used for inserting into the first recess and expanding the side wall of the first recess to make the side wall of the first recess incline outwards, and the second pressing block is used for squeezing the side wall of the first recess to make the side wall of the first recess fold towards the housing bottom wall.

[0069] In the above solution, after the first pressing block is inserted into the first recess, the side wall of the first recess is gradually expanded to make the side wall of the first recess incline outwards. After the side wall of the first recess inclines outwards, the second pressing block can more easily press against the inner wall surface of the side wall of the first recess, so that the side wall of the first recess can be bent along a preset direction.

[0070] In a sixth aspect, a manufacturing method of a battery cell provided by an embodiment of the present application includes:

[0071] A housing and an electrode terminal are provided. The housing includes an integrally formed housing side wall and a housing bottom wall. The housing side wall is disposed around the housing bottom wall. One end of the housing side wall is connected to the housing bottom wall. The other end of the housing side wall forms an opening opposite to the housing bottom wall. The housing bottom wall is provided with an electrode lead-out hole. The electrode terminal is mounted in the electrode lead-out hole. The electrode terminal is fixed to the housing bottom wall by forming a first recess at one end extending into the housing and folding the side wall of the first recess outward.

[0072] Providing an electrode assembly, the electrode assembly including a first electrode tab;

[0073] Providing a current collecting component and connecting the current collecting component to the first electrode tab;

[0074] The electrode assembly and the current collecting member are installed in the shell, and the current collecting member is abutted against and connected to the bottom surface of the first recess, and the current collecting member is located between the bottom wall of the shell and the first electrode tab.

[0075] In some embodiments, the electrode assembly has a winding center hole. The step of abutting and connecting the current collecting member against the bottom surface of the first recess includes: inserting a welding member from the opening into the case and passing through the winding center hole to weld the current collecting member to the bottom surface of the first recess.

[0076] In the above solution, the winding center hole can provide an escape space for external welding components, so that the external welding components can pass through the electrode assembly and weld the current collecting member to the bottom surface of the first recess.

[0077] In a seventh aspect, an embodiment of the present application provides a battery cell manufacturing system, comprising:

[0078] A third device is provided, providing a housing and an electrode terminal, the housing including an integrally formed housing side wall and a housing bottom wall, the housing side wall being arranged around the housing bottom wall, one end of the housing side wall being connected to the housing bottom wall, and the other end of the housing side wall forming an opening opposite to the housing bottom wall, the housing bottom wall being provided with an electrode lead-out hole, the electrode terminal being mounted in the electrode lead-out hole, and the electrode terminal being fixed to the housing bottom wall by forming a first recess at one end extending into the housing and folding the side wall of the first recess outward;

[0079] A fourth providing device is used to provide an electrode assembly, the electrode assembly including a first electrode tab;

[0080] A fifth providing device is used to provide a current collecting component and connect the current collecting component to the first electrode tab;

[0081] The second assembly component is used to install the electrode assembly and the current collecting component in the shell, and to abut and connect the current collecting component with the bottom surface of the first recess, and the current collecting component is located between the bottom wall of the shell and the first electrode tab.

[0082] In some embodiments, the electrode assembly has a winding center hole; the second assembling component includes a welding component for entering the housing through the opening and passing through the winding center hole to weld the current collecting member and the bottom surface of the first recess.

[0083] In the above solution, the winding center hole can provide an avoidance space for the external welding component, so that the external welding component can pass through the electrode assembly and weld the current collecting member to the bottom surface of the first recess. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the drawings without creative efforts.

[0085] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0086] Figure 2 Explosion schematic diagram of a battery provided by some embodiments of the present application;

[0087] Figure 3 For Figure 2 Explosion schematic diagram of the battery module shown;

[0088] Figure 4 Cross-sectional schematic diagram of a battery cell provided by some embodiments of the present application;

[0089] Figure 5 For Figure 4 Enlarged schematic diagram of the battery cell shown at the circular frame A;

[0090] Figure 6 For Figure 5 Enlarged schematic diagram at the square frame B;

[0091] Figure 7 For Figure 4 Structural schematic diagram of the housing and the electrode terminal before assembly shown;

[0092] Figure 8 For Figure 7 Enlarged schematic diagram at the circular frame C;

[0093] Figure 9 Partial cross-sectional schematic diagram of a battery cell provided by other embodiments of the present application;

[0094] Figure 10 Partial cross-sectional schematic diagram of a battery cell provided by still other embodiments of the present application;

[0095] Figure 11 A schematic diagram of a process for assembling a housing and an electrode terminal according to some embodiments of the present application;

[0096] Figure 12 A schematic block diagram of an assembly device for a housing and an electrode terminal provided in some embodiments of the present application;

[0097] Figure 13 A schematic flow chart of a method for manufacturing a battery cell according to some embodiments of the present application;

[0098] Figure 14 A schematic block diagram of a battery cell manufacturing system provided in some embodiments of the present application.

[0099] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0100] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0101] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0102] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0103] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined" and "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0104] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0105] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed descriptions of the same components are omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only for illustrative purposes and should not constitute any limitation to the present application.

[0106] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0107] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc., and the embodiments of the present application do not limit this either.

[0108] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0109] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collecting portion and a positive electrode tab connected to the positive current collecting portion. The positive current collecting portion is coated with the positive active material layer, and the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, etc. The negative electrode plate includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collecting portion and a negative electrode tab connected to the negative current collecting portion. The negative current collecting portion is coated with the negative active material layer, and the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0110] The battery cell further includes a housing for accommodating the electrode assembly, an electrode terminal installed on the housing, and a current collecting member for electrically connecting the electrode terminal and the electrode plate of the electrode assembly.

[0111] In the related art, when assembling the housing and the electrode terminal, usually the electrode terminal is first inserted into the electrode lead-out hole of the housing from the inside of the housing so that the outer end of the electrode terminal extends to the outside of the housing, and then a limiting structure is formed by squeezing the outer end of the electrode terminal to fix the electrode terminal to the housing. However, the inventor found that when squeezing the electrode terminal, the outer surface of the electrode terminal will be uneven. When multiple battery cells are assembled into a group through a bus bar component, it is easy to cause poor contact between the electrode terminal and the bus bar component, affecting the over-current capacity. In addition, the outer end of the electrode terminal needs to pass through the electrode lead-out hole, which limits the size of the outer end of the electrode terminal, resulting in a small connection area between the electrode terminal and the bus bar component and affecting the over-current capacity.

[0112] The inventor tried to insert the electrode terminal into the electrode lead-out hole from the outside of the housing and squeeze the inner end of the electrode terminal to form a limiting structure to fix the electrode terminal to the housing. In this way, the outer end of the electrode terminal does not need to be extruded and formed, and its flatness can be guaranteed, thereby ensuring the connection strength and over-current capacity between the electrode terminal and the bus bar component. The outer end of the electrode terminal does not need to pass through the electrode lead-out hole, and it can have a larger size, so that the connection area between the electrode terminal and the bus bar component can be increased to ensure the over-current capacity.

[0113] However, further research by the inventors revealed that the inner end of the electrode terminal needs to be connected to the current collecting member. Extrusion of the inner end of the electrode terminal would affect the connection between the two components. Furthermore, directly extruding the inner end of the electrode terminal to form the retaining structure would require excessive pressure, which could easily cause damage to the outer casing or other components within it.

[0114] In view of this, the present invention provides a technical solution that secures the electrode terminal to the housing by defining a recess at the inner end of the electrode terminal and folding the sidewalls of the recess. This reduces the difficulty of installing the electrode terminal and reduces the pressure on the electrode terminal during the molding process. The electrode terminal is compressed by the sidewalls of the recess, thus preventing the bottom surface of the recess from being subjected to force. In this technical solution, by abutting and connecting the current collecting member with the bottom surface of the first recess, a close fit between the current collecting member and the electrode terminal is ensured, thereby improving the connection strength between the current collecting member and the electrode terminal.

[0115] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0116] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0117] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0118] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0119] like Figure 1 As shown, a battery 2 is provided inside the vehicle 1, and the battery 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery 2 can be used to power the vehicle 1, for example, the battery 2 can be used as an operating power source for the vehicle 1.

[0120] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0121] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0122] Figure 2 Schematic diagram of the explosion of the battery provided in some embodiments of the present application. Figure 2 As shown, the battery 2 includes a box 5 and a battery cell ( Figure 2 The battery cells are housed in the box body 5 .

[0123] The housing 5 is used to house battery cells and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other, and the first housing portion 5a and the second housing portion 5b together define a storage space 5c for accommodating the battery cells. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. The first housing portion 5a and the second housing portion 5b can also be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0124] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0125] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0126] In battery 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery module can be housed within housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 6, and then multiple battery modules 6 can be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within housing 5.

[0127] Figure 3 for Figure 2 An exploded diagram of the battery module is shown.

[0128] In some embodiments, as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, in parallel, or in mixed series to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed series to form a whole, which is accommodated in a box.

[0129] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0130] Figure 4 A schematic cross-sectional view of a battery cell provided in some embodiments of the present application; Figure 5 for Figure 4 An enlarged schematic diagram of a battery cell at circle A is shown; Figure 6 for Figure 5 An enlarged schematic diagram at box B; Figure 7 for Figure 4 The schematic diagram of the structure of the housing and electrode terminals before assembly is shown; Figure 8 for Figure 7 Enlarged schematic diagram at circle C.

[0131] like Figures 4 to 8 As shown, the battery cell 7 of the present embodiment includes: an electrode assembly 10 including a first electrode tab 11; a housing 20 for accommodating the electrode assembly 10, the housing 20 including a wall portion with an electrode lead-out hole 21; an electrode terminal 30 mounted in the electrode lead-out hole 21; and a current collecting member 40 located between the wall portion and the first electrode tab 11 and used to connect the electrode terminal 30 and the first electrode tab 11. The electrode terminal 30 is secured to the wall portion by defining a first recess 31 at one end facing the first electrode tab 11 and folding the sidewall 311 of the first recess outward. The current collecting member 40 abuts against and connects to the bottom surface 312 of the first recess.

[0132] The electrode assembly 10 includes a first electrode plate, a second electrode plate, and a separator, wherein the separator is used to separate the first electrode plate and the second electrode plate. The polarity of the first electrode plate and the second electrode plate are opposite. In other words, one of the first electrode plate and the second electrode plate is a positive electrode plate, and the other of the first electrode plate and the second electrode plate is a negative electrode plate.

[0133] Optionally, the first pole piece, the second pole piece and the separator are all strip-shaped structures, and the first pole piece, the second pole piece and the separator are wound together to form a wound structure. The wound structure can be a cylindrical structure, a flat structure or a structure of other shapes.

[0134] Viewed from the outer shape of the electrode assembly 10, the electrode assembly 10 includes a main body portion 12, a first tab 11 and a second tab 13, and the first tab 11 and the second tab 13 protrude from the main body portion 12. The first tab 11 is the portion of the first electrode plate where the active material layer is not coated, and the second tab 13 is the portion of the second electrode plate where the active material layer is not coated. Correspondingly, one of the first tab 11 and the second tab 13 is a tab with a positive polarity, and the other is a tab with a negative polarity.

[0135] The first tab 11 and the second tab 13 can extend from the same side of the main body portion 12, or can extend from opposite sides respectively. Exemplarily, the first tab 11 and the second tab 13 are respectively disposed on both sides of the main body portion 12. In other words, the first tab 11 and the second tab 13 are respectively disposed at both ends of the electrode assembly 10.

[0136] The outer shell 20 has a hollow structure, and an accommodation cavity for accommodating the electrode assembly 10 and the electrolyte is formed inside it. The outer shell 20 can be of various shapes, such as a cylinder, a cuboid, etc. The shape of the outer shell 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cylindrical structure, a cylindrical outer shell can be selected; if the electrode assembly 10 is a cuboid structure, a cuboid outer shell can be selected.

[0137] The outer shell 20 can be positively charged, negatively charged, or uncharged. When the outer shell 20 needs to be charged, the outer shell 20 can be directly connected to the tab of the electrode assembly 10, or can be electrically connected to the tab through other conductive members.

[0138] The outer shell 20 includes a housing 22 and a cover plate 23. The housing 22 has an opening, and the cover plate 23 covers the opening of the housing 22 and forms a sealed connection to form an accommodation cavity for accommodating the electrode assembly 10 and the electrolyte.

[0139] The housing 22 can be a structure with an opening on one side, and the cover plate 23 is provided as one and covers the opening of the housing 22. Alternatively, the housing 22 can also be a structure with openings on both sides, and the cover plates 23 are provided as two, and the two cover plates 23 respectively cover the two openings of the housing 22.

[0140] In the embodiment of the present application, the wall portion is a part of the outer shell 20. For example, the wall portion can be the cover plate 23, or can be a part of the housing 22.

[0141] The electrode lead hole 21 penetrates through the wall portion along the thickness direction Z of the wall portion, so as to facilitate the electrode terminal 30 to extend into the interior of the outer shell 20 and lead the electric energy in the electrode assembly 10 to the outside of the outer shell 20.

[0142] Exemplarily, the wall portion can be a plate-like structure; for example, the wall portion can be a flat plate structure.

[0143] The electrode terminal 30 can be insulated and disposed on the wall, or can be electrically connected to the wall. This embodiment of the present application does not limit this, as long as the first electrode tab 11 and the second electrode tab 13 are prevented from being electrically connected.

[0144] When a plurality of battery cells 7 are assembled into a group, the electrode terminals 30 may be used to connect to a busbar component to achieve electrical connection between the battery cells 7 .

[0145] The current collecting member 40 can be connected to the first electrode tab 11 by welding, abutting, or bonding, and connected to the electrode terminal 30 by welding, abutting, bonding, riveting, etc., thereby achieving electrical connection between the first electrode tab 11 and the electrode terminal 30. The current collecting member 40 is made of a conductive material, for example, the current collecting member 40 is made of a conductive metal.

[0146] When preparing the electrode terminal 30, a first recess 31 may be formed at one end of the electrode terminal 30 for extending into the housing 20. The first recess 31 may be formed by stamping, milling, or other processes.

[0147] When assembling the outer shell 20 and the electrode terminal 30, the electrode terminal 30 can be extended from the outside of the outer shell 20 into the outer shell 22. The end of the electrode terminal 30 extending into the outer shell 20 is used to face the first electrode tab 11. After the electrode terminal 30 is inserted into the outer shell 22, an external device can be inserted into the outer shell 20 and squeeze the side wall 311 of the first recess, thereby folding the side wall 311 of the first recess outward. After being folded, the side wall 311 of the first recess snaps onto the wall, securing the electrode terminal 30 to the wall. For example, after the side wall 311 of the first recess is folded and formed, the electrode terminal 30 is riveted to the wall.

[0148] In this embodiment, the entire side wall 311 of the first recess may be folded outward, or only a portion of the side wall 311 of the first recess may be folded outward.

[0149] During the process of fixing the electrode terminal 30 to the wall, the sidewall 311 of the first recess is squeezed by external equipment, which can reduce the risk of deformation of the bottom surface 312 of the first recess during the folding of the sidewall 311 of the first recess.

[0150] The current collecting member 40 abuts against the bottom surface 312 of the first recess. The bottom surface 312 of the first recess is not easily deformed during the molding process of the electrode terminal 30. This ensures that the current collecting member 40 and the bottom surface 312 of the first recess are tightly fitted, thereby improving the connection strength between the current collecting member 40 and the electrode terminal 30.

[0151] The current collecting member 40 may be connected to the bottom surface 312 of the first recess by pressing, bonding, welding or other methods.

[0152] In this embodiment, a first recess 31 is formed at one end of the electrode terminal 30 facing the first tab 11, and the side wall 311 of the first recess is folded outward to fix the electrode terminal 30 to the wall portion of the housing 20. The portion of the electrode terminal 30 that is pressed is the side wall 311 of the first recess, and the side wall 311 of the first recess is a wall-like structure and is easy to fold. In this way, the pressure on the electrode terminal 30 during the forming process can be reduced, stress concentration can be decreased, and the installation difficulty of the electrode terminal 30 can be reduced. During the process of fixing the electrode terminal 30 to the wall portion, the side wall 311 of the first recess is squeezed by an external device. In this way, the risk of deformation of the bottom surface 312 of the first recess during the folding of the side wall 311 of the first recess can be reduced, so as to ensure the close fit between the current collector member 40 and the bottom surface 312 of the first recess, and improve the connection strength between the current collector member 40 and the electrode terminal 30.

[0153] In some embodiments, the housing 20 includes a cover plate 23 and a housing body 22. The housing body 22 includes a housing side wall 221 and a housing bottom wall 222 formed integrally. The housing side wall 221 surrounds the housing bottom wall 222. One end of the housing side wall 221 is connected to the housing bottom wall 222, and the other end of the housing side wall 221 encloses an opening 223 opposite to the housing bottom wall 222. The cover plate 23 covers the opening 223. The wall portion is the housing bottom wall 222 or the cover plate 23.

[0154] The housing body 22 is a hollow structure with an opening on one side. The cover plate 23 is covered at the opening of the housing body 22 and forms a sealed connection to form a receiving cavity for receiving the electrode assembly 10 and the electrolyte. The housing body 22 can be of various shapes, such as a cylinder, a cuboid, etc. The shape of the housing body 22 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cylindrical structure, a cylindrical housing can be selected; if the electrode assembly 10 is a cuboid structure, a cuboid housing can be selected.

[0155] The housing side wall 221 is a cylindrical structure and surrounds the outside of the electrode assembly 10. According to the specific shape of the electrode assembly 10, the housing side wall 221 can be a cylindrical tube, a square tube or other shapes. The housing bottom wall 222 is a plate-like structure, and its shape corresponds to the shape of the housing side wall 221.

[0156] The housing side wall 221 and the housing bottom wall 222 are integrally formed structures, which can eliminate the connection process between the housing bottom wall 222 and the housing side wall 221 and reduce the resistance between the two. For example, the housing 22 can be formed by a stretching process.

[0157] The wall portion can be the housing bottom wall 222 or the cover plate 23, and this embodiment does not limit this.

[0158] In some embodiments, the cover plate 23 may be connected to the housing sidewall 221 by welding. Optionally, the cover plate 23 and the housing 22 may be made of the same material to ensure the welding strength between the cover plate 23 and the housing sidewall 221.

[0159] In some embodiments, the surface of the electrode terminal 30 facing away from the first electrode tab 11 is a plane.

[0160] The surface of the electrode terminal 30 facing away from the first electrode tab 11 is the end surface of the electrode terminal 30 facing away from the first electrode tab 11 , and this end surface is exposed to the outside of the housing 20 .

[0161] In this embodiment, the surface of the electrode terminal 30 facing away from the first electrode ear 11 can be used to connect to the external busbar component, and the plane can ensure close contact between the electrode terminal 30 and the busbar component, simplify the assembly process of the electrode terminal 30 and the busbar component, and improve the connection strength and current carrying capacity between the electrode terminal 30 and the busbar component.

[0162] In some embodiments, the bottom surface 312 of the first recess is flat.

[0163] In this embodiment, the current collecting component 40 is used to abut against the bottom surface 312 of the first recess, and setting the bottom surface 312 of the first recess as a plane can make the current collecting component 40 and the bottom surface 312 of the first recess in close contact, thereby improving the connection strength and flow capacity between the two.

[0164] In some embodiments, the first electrode tab 11 is wound multiple times around the central axis of the electrode assembly 10. In other words, the first electrode tab 11 includes multiple turns of electrode tab layers. After winding, the first electrode tab 11 is generally cylindrical, with a gap between two adjacent turns of electrode tab layers. In embodiments of the present application, the first electrode tab 11 can be processed to reduce the gap between the electrode tab layers, thereby facilitating the connection of the first electrode tab 11 to the current collecting member 40. For example, in embodiments of the present application, the first electrode tab 11 can be flattened to gather and bring together the end regions of the first electrode tab 11 away from the main body 12; the flattening process forms a dense end surface at the end of the first electrode tab 11 away from the main body 12, thereby reducing the gap between the electrode tab layers and facilitating the connection of the first electrode tab 11 to the current collecting member 40. Alternatively, in embodiments of the present application, conductive material can be filled between two adjacent turns of electrode tab layers to reduce the gap between the electrode tab layers.

[0165] Optionally, the second electrode tab 13 is wound multiple times around the central axis of the electrode assembly 10, and the second electrode tab 13 includes multiple electrode tab layers. Exemplarily, the second electrode tab 13 is also flattened to reduce gaps between the electrode tab layers of the second electrode tab 13.

[0166] In some embodiments, the battery cell 7 is a cylindrical battery cell. Correspondingly, the electrode assembly 10 is a cylindrical structure, and the housing sidewall 221 is a cylindrical structure.

[0167] To facilitate description of the embodiments of the present application, the drawings and the following description of the present application take the shell bottom wall 222 as the wall portion of the outer shell 20 .

[0168] In some embodiments, the electrode terminal 30 includes a retaining portion 32 located on the side of the wall facing away from the first electrode tab 11; a body portion 33 connected to the surface of the retaining portion 32 facing the wall and extending through the electrode lead-out hole 21. The end of the body portion 33 facing the first electrode tab 11 is provided with a first recess 31 and a flange structure 34. The flange structure 34 is formed by folding the sidewall 311 of the first recess outward. The retaining portion 32 and flange structure 34 are used to clamp a portion of the wall to secure the electrode terminal 30 to the wall.

[0169] In the thickness direction Z of the wall, at least a portion of the stopper 32 overlaps the wall, and at least a portion of the flange structure 34 overlaps the wall. The stopper 32 and the flange structure 34 may directly clamp the wall or indirectly clamp the wall through other components.

[0170] The limiting portion 32 may be a plate-like structure. For example, the limiting portion 32 may be a flat plate structure, and its surface facing away from the main body 33 may be a plane. Before forming the flange structure 34, the main body 33 may be a columnar structure having the first recess 31. For example, the main body 33 may be a cylindrical structure.

[0171] When assembling the housing 20 and electrode terminal 30, the body 33 can be inserted into the housing 20 from the outside, while the retaining portion 32 can retain the electrode terminal 30 from the outside. After the body 33 is inserted into the housing 20, the sidewall 311 of the first recess is folded outward to form a flange structure 34. The flange structure 34 and the retaining portion 32 respectively clamp the wall portion from both sides to secure the electrode terminal 30 to the wall portion.

[0172] In some embodiments, the side wall 311 of the first recess can be folded outward according to the following steps: a first pressing block is extended into the first recess 31 and the side wall 311 of the first recess is stretched open so that the side wall 311 of the first recess is tilted outward; and a second pressing block is used to squeeze the side wall 311 of the first recess so that the side wall 311 of the first recess is folded toward the wall.

[0173] Exemplarily, the first pressing block may be a conical pressing block. After it extends into the first recess 31, it gradually expands the side wall 311 of the first recess, causing the side wall 311 of the first recess to incline outward. After the side wall 311 of the first recess inclines outward, the second pressing block can more easily press against the inner wall surface of the side wall 311 of the first recess, enabling the side wall 311 of the first recess to bend along a preset direction.

[0174] In some embodiments, the first recess 31 is a conical recess, and its cross-sectional area gradually increases in a direction away from the limiting portion 32. The conical recess can make it easier for the first pressing block to be inserted.

[0175] In some embodiments, in the radial direction of the wall portion, the size of the limiting portion 32 is larger than the size of the flanging structure 34.

[0176] The wall portion is a plate-like structure and has a central axis. In the description of the embodiments of the present application, the radial direction of the wall portion is a direction perpendicular to the thickness direction Z of the wall portion and passing through the central axis.

[0177] The radial direction described in the present application is applicable to a circular wall portion. For a circular wall portion, the radial direction of the wall portion may be the radius direction of the wall portion. Of course, the radial direction described in the present application may also be applicable to a square wall portion or other shaped wall portions.

[0178] In this embodiment, the limiting portion 32 may have a relatively large size in the radial direction, which can facilitate the assembly of the limiting portion 32 and an external current collecting component, increase the connection area between the limiting portion 32 and the current collecting component, and improve the current-carrying capacity. The flanging structure 34 has a relatively small size in the radial direction, which can reduce the pressure required for flanging and lower the difficulty of forming the flanging structure 34.

[0179] In some embodiments, in the radial direction of the wall portion, at least a part of the thickness of the flanging structure 34 starting from the outer end surface 341 gradually increases from the outside to the inside.

[0180] After the flanging structure 34 is formed, the outer end surface 341 is an outer peripheral surface arranged along the boundary of the flanging structure 34. The flanging structure 34 includes a variable-thickness region, and the thickness of the variable-thickness region gradually increases from the outside to the inside. In other words, in the radial direction of the wall portion, the thickness of the variable-thickness region gradually decreases from the inside to the outside. The outer end surface 341 is the end surface of the variable-thickness region in the radial direction.

[0181] The flanging structure 34 may be entirely a variable-thickness region, that is, the thickness of the flanging structure 34 as a whole shows a trend of gradually increasing from the outside to the inside. Of course, the flanging structure 34 may also be only partially a variable-thickness region, but the variable-thickness region surrounds the outside of other regions of the flanging structure 34.

[0182] Before folding the side wall 311 of the first recess, the end of the side wall 311 of the first recess has an end face surrounding the opening of the first recess 31; after folding the side wall 311 of the first recess and forming the flanging structure 34, the end face of the side wall 311 of the first recess surrounding the opening of the first recess 31 moves outward and forms the outer end face 341 of the flanging structure 34.

[0183] In this embodiment, during the forming process of the flanging structure 34, the portion of the flanging structure 34 close to the outer end face 341 is first pressed; and the thickness of the portion of the flanging structure 34 close to the outer end face 341 is relatively small and is more easily folded, which can reduce the difficulty of forming the flanging structure 34.

[0184] In some embodiments, at least a part of the surface of the flanging structure 34 facing the first tab 11 is an inclined surface 342, and the inclined surface 342 is connected to the outer end face 341 and is inclined towards the electrode assembly 10.

[0185] In this embodiment, by providing the inclined surface 342, at least a part of the thickness of the flanging structure 34 starting from the outer end face 341 can gradually increase from the outside to the inside. Before the flanging structure 34 is formed, the inclined surface 342 is a part of the inner wall surface of the side wall 311 of the first recess, and it can play a guiding role to facilitate an external device (such as the first pressing block) to extend into the first recess 31.

[0186] In some embodiments, in the thickness direction Z of the wall portion, the bottom surface 312 of the first recess is closer to the first tab 11 than the inner surface of the wall portion.

[0187] The inner surface and the outer surface of the wall portion are oppositely arranged in the thickness direction Z, and the inner surface of the wall portion faces the first tab 11. The electrode lead-out hole 21 penetrates the wall portion, and the hole wall surface of the electrode lead-out hole 21 connects the inner surface and the outer surface of the wall portion. In the thickness direction Z, the bottom surface 312 of the first recess is closer to the first tab 11 than the inner surface of the wall portion, that is to say, the bottom surface 312 of the first recess is located outside the electrode lead-out hole 21.

[0188] During the process of folding the side wall 311 of the first recess, the portion of the side wall 311 of the first recess close to the bottom surface 312 of the first recess will be deformed; if the bottom surface 312 of the first recess is flush with the inner surface of the wall portion, or the bottom surface 312 of the first recess is farther from the first tab 11 than the inner surface of the wall portion (that is, the bottom surface 312 of the first recess is located inside the electrode lead-out hole 21), then the side wall 311 of the first recess may squeeze the hole wall surface of the electrode lead-out hole 21 during folding, causing the risk of wall portion deformation.

[0189] In this embodiment, the bottom surface 312 of the first recess is closer to the first tab 11 than the inner surface of the wall, so as to reduce the pressure exerted by the side wall 311 of the first recess on the wall during the folding process and reduce the risk of the wall being crushed.

[0190] In some embodiments, the battery cell 7 further includes a sealing member 50 disposed between the wall portion and the electrode terminal 30 and configured to seal the electrode lead-out hole 21 .

[0191] In this embodiment, a sealing member 50 is provided to seal the electrode lead-out hole 21 , which can improve the sealing performance of the battery cell 7 , reduce the risk of electrolyte leakage, and improve the safety of the battery cell 7 .

[0192] Illustratively, the sealing member 50 is made of an elastic material, for example, the sealing member 50 may be made of rubber, polyvinyl chloride (PVC) or other materials.

[0193] In some embodiments, the sealing member 50 includes a first sealing portion 51 that surrounds the outer side of the body portion 33 and is located between the wall portion and the stopper portion 32. The electrode terminal 30 also includes a first protrusion 35 that is protruding from the surface of the stopper portion 32 facing the first sealing portion 51 and is disposed around the body portion 33. The first protrusion 35 is used to press against the first sealing portion 51 to seal the electrode lead-out hole 21; and / or the sealing member 50 also includes a second protrusion (not shown) that is protruding from the surface of the first sealing portion 51 facing the stopper portion 32 and is disposed around the body portion 33. The second protrusion is used to press against the stopper portion 32 to seal the electrode lead-out hole 21.

[0194] In this embodiment, only the first protrusion 35 may be provided, only the second protrusion may be provided, or both the first protrusion 35 and the second protrusion may be provided.

[0195] In some examples, the first protrusion 35 may be a 360° annular protrusion. In other examples, the first protrusion 35 may not be a 360° annular protrusion; for example, the first protrusion 35 may be a 270° annular protrusion. In still other examples, the first protrusion 35 may include a plurality of dot-shaped protrusions or linear protrusions spaced around the body portion 33.

[0196] In some examples, the second protrusion may be a 360° annular protrusion. In other examples, the second protrusion may not be a 360° annular protrusion; for example, the second protrusion may be a 270° annular protrusion. In still other examples, the second protrusion may include a plurality of dot-shaped protrusions or linear protrusions spaced around the body portion 33.

[0197] In this embodiment, a first protrusion is provided protruding from the stopper 32. When the stopper 32 and the wall clamp the first sealing portion 51, the first protrusion can be embedded in the first sealing portion 51, thereby increasing the local compression of the first sealing portion 51 and improving the sealing performance. A second protrusion is provided protruding from the first sealing portion 51. When the stopper 32 and the wall clamp the first sealing portion 51, the stopper 32 compresses the second protrusion and the first sealing portion 51 simultaneously, thereby increasing the compression of the sealing member 50 at the second protrusion and improving the sealing performance.

[0198] In some embodiments, the projection of the first protrusion 35 along the thickness direction Z of the wall is located within the projection of the flange structure 34 along the thickness direction Z; and / or, the projection of the second protrusion along the thickness direction Z of the wall is located within the projection of the flange structure 34 along the thickness direction Z.

[0199] The above projections are projections on a plane. For example, the projection of the first protrusion 35 along the thickness direction Z of the wall portion refers to the orthographic projection of the first protrusion 35 in the first plane perpendicular to the thickness direction Z, and the projection of the flange structure 34 along the thickness direction Z refers to the orthographic projection of the flange structure 34 in the first plane.

[0200] After the limiting portion 32 compresses the first sealing portion 51, the flange structure 34 is used to limit the electrode terminal 30 from the inside to prevent the limiting portion 32 from being stretched open by the elastic force of the first sealing portion 51. The portion of the first sealing portion 51 corresponding to the flange structure 34 in the thickness direction Z is subjected to greater pressure.

[0201] In this embodiment, the projection of the first protrusion 35 along the thickness direction Z of the wall is located within the projection of the flange structure 34 along the thickness direction Z, so that the first protrusion 35 and the flange structure 34 can clamp the first sealing portion 51 from both sides to increase the compression amount of the first sealing portion 51 and improve the sealing performance.

[0202] In this embodiment, the projection of the second protrusion along the thickness direction Z of the wall portion is located within the projection of the flange structure 34 along the thickness direction Z. In this way, the limiting portion 32 and the flange structure 34 can clamp the second protrusion and the first sealing portion 51 from both sides to increase the compression amount of the sealing component 50 at the second protrusion and improve the sealing performance.

[0203] In some embodiments, in the radial direction of the wall portion, the minimum spacing between the first protrusion 35 and the main body portion 33 is smaller than the minimum spacing between the first protrusion 35 and the outer edge of the limiting portion 32; and / or, in the radial direction of the wall portion, the minimum spacing between the second protrusion and the main body portion 33 is smaller than the minimum spacing between the second protrusion and the outer edge of the limiting portion 32.

[0204] At the connection of the first protrusion 35 and the limiting portion 32, there are a first inner boundary line and a first outer boundary line. The first inner boundary line is located at one end of the first protrusion 35 facing the body portion 33. At the connection of the body portion 33 and the limiting portion 32, there is a second outer boundary line. The minimum radial distance between the first protrusion 35 and the body portion 33 is: the minimum radial distance between the second outer boundary line and the first inner boundary line; Exemplarily, the minimum radial distance between the first protrusion 35 and the body portion 33 is: the difference between the inner radius of the first protrusion 35 and the outer radius of the end of the body portion 33 connected to the limiting portion 32. The minimum radial distance between the outer edge of the first protrusion 35 and the limiting portion 32 is: the minimum radial distance between the outer edge of the limiting portion 32 and the first outer boundary line; Exemplarily, the minimum radial distance between the outer edge of the first protrusion 35 and the limiting portion 32 is: the difference between the outer radius of the limiting portion 32 and the outer radius of the first protrusion 35.

[0205] At the connection of the second protrusion and the first sealing portion 51, there are a second inner boundary line and a third outer boundary line. The second inner boundary line is located at one end of the second protrusion facing the body portion 33. At the connection of the body portion 33 and the limiting portion 32, there is a second outer boundary line. The minimum radial distance between the second protrusion and the body portion 33 is: the minimum radial distance between the second outer boundary line and the second inner boundary line; Exemplarily, the minimum radial distance between the second protrusion and the body portion 33 is: the difference between the inner radius of the second protrusion and the outer radius of the end of the body portion 33 connected to the limiting portion 32. The minimum radial distance between the outer edge of the second protrusion and the limiting portion 32 is: the minimum radial distance between the outer edge of the limiting portion 32 and the third outer boundary line; Exemplarily, the minimum radial distance between the outer edge of the second protrusion and the limiting portion 32 is: the difference between the outer radius of the limiting portion 32 and the outer radius of the second protrusion.

[0206] The first protrusion 35 presses against the first sealing portion 51, and it will exert a supporting force on the limiting portion 32. In the radial direction of the wall portion, the smaller the distance between the first protrusion 35 and the body portion 33, the smaller the torque received by the limiting portion 32, and the less likely the outer edge of the limiting portion 32 is to warp and deform; on the contrary, the larger the distance between the first protrusion 35 and the body portion 33, the greater the torque received by the limiting portion 32, and the more likely the outer edge of the limiting portion 32 is to warp and deform.

[0207] If the outer edge of the limiting portion 32 warps and deforms, then when the limiting portion 32 is connected to the confluence component, it is likely to cause poor contact between the limiting portion 32 and the confluence component, resulting in insufficient connection strength between the limiting portion 32 and the confluence component.

[0208] In this embodiment, the minimum distance between the first protrusion 35 and the body portion 33 is less than the minimum distance between the first protrusion 35 and the outer edge of the limiting portion 32, which can reduce the torque received by the limiting portion 32 and reduce the risk of the limiting portion 32 warping and deforming.

[0209] When the stopper 32 and the flange structure 34 clamp the first sealing portion 51 and the second protrusion, the second protrusion exerts a supporting force on the stopper 32. In the radial direction of the wall, the smaller the distance between the second protrusion and the main body 33, the smaller the torque applied to the stopper 32, and the less likely the outer edge of the stopper 32 is to warp or deform. Conversely, the larger the distance between the second protrusion and the main body 33, the greater the torque applied to the stopper 32, and the more likely the outer edge of the stopper 32 is to warp or deform.

[0210] In this embodiment, the minimum distance between the second protrusion and the main body 33 is smaller than the minimum distance between the second protrusion and the outer edge of the limiting portion 32. This can reduce the torque applied to the limiting portion 32 and reduce the risk of the limiting portion 32 tilting and deforming.

[0211] In some embodiments, the sealing member 50 further includes a second sealing portion 52, which is sleeved on the body portion 33 and connected to the first sealing portion 51. A portion of the second sealing portion 52 is folded outward under the pressure of the flange structure 34 and is clamped between the wall portion and the flange structure 34.

[0212] Before the flange structure 34 is formed, the second sealing portion 52 is a cylindrical structure that is sleeved onto the main body 33 and can be inserted into the electrode lead-out hole 21 along with the main body 33. During the process of folding the sidewall 311 of the first recess to form the flange structure 34, a portion of the second sealing portion 52 is folded outward under the pressure of the flange structure 34 and is clamped between the wall and the flange structure 34.

[0213] In this embodiment, the second sealing portion 52 not only improves sealing performance but also separates the main body 33 from the wall, preventing direct contact and friction between the main body 33 and the wall, thereby reducing the risk of particle generation. Furthermore, the second sealing portion 52 can extend directly into the electrode lead-out hole 21 and fold over as the flange structure 34 is formed, eliminating the need to pre-integrate the sealing member 50 with the wall, thereby simplifying the assembly process.

[0214] In some embodiments, the electrode assembly 10 further includes a second electrode tab 13 having a polarity opposite to that of the first electrode tab 11 , and the second electrode tab 13 is electrically connected to the wall portion. The sealing member 50 insulates the wall portion from the electrode terminal 30 .

[0215] The wall and the electrode terminal 30 may have different polarities, that is, the electrode terminal 30 and the wall may serve as two output poles of the battery cell 7. The housing 20 itself may serve as the output pole of the battery cell 7, thereby eliminating a traditional electrode terminal 30 and simplifying the structure of the battery cell 7.

[0216] When the first tab 11 is a positive tab and the second tab 13 is a negative tab, the wall portion is the negative output terminal of the battery cell 7, and the electrode terminal 30 is the positive output terminal of the battery cell 7. When the first tab 11 is a negative tab and the second tab 13 is a positive tab, the wall portion is the positive output terminal of the battery cell 7, and the electrode terminal 30 is the negative output terminal of the battery cell 7.

[0217] In this embodiment, the sealing member 50 insulates and separates the wall portion from the electrode terminal 30. Therefore, the wall portion and the electrode terminal 30 can have different polarities. The wall portion and the electrode terminal 30 can serve as two output poles of the battery cell 7. This simplifies the structure of the battery cell 7 and ensures the current carrying capacity of the battery cell 7. The wall portion and the electrode terminal 30 are located at the same end of the battery cell 7. In this way, the busbar can be assembled to the same side of the battery cell 7, which simplifies the assembly process and improves the efficiency of assembling multiple battery cells 7 into groups.

[0218] In some embodiments, the wall portion is the housing bottom wall 222 .

[0219] The first electrode tab 11 is located at one end of the electrode assembly 10 facing the bottom wall 222 of the housing, and the second electrode tab 13 is located at one end of the electrode assembly 10 facing the cover plate 23 .

[0220] Optionally, the cover plate 23 is connected to the second electrode tab 13 and the housing side wall 221 , respectively, so as to electrically connect the second electrode tab 13 and the housing bottom wall 222 .

[0221] In some embodiments, the second tab 13 is a negative tab, and the base material of the cover plate 23 and the base material of the housing 22 are both steel. The housing 22 is electrically connected to the negative tab, so the housing 22 is in a low potential state. The steel housing 22 is not easily corroded by the electrolyte in this low potential state, thereby reducing safety risks.

[0222] In some embodiments, the current collecting member 40 includes a first current collecting portion 41 and a second current collecting portion 42 connected to the first current collecting portion 41. The first current collecting portion 41 is used to connect to the first electrode tab 11 to electrically connect the current collecting member 40 and the first electrode tab 11, and the second current collecting portion 42 is used to connect to the electrode terminal 30 to electrically connect the current collecting member 40 and the electrode terminal 30. The second current collecting portion 42 is protruded from the surface of the first current collecting portion 41 facing the electrode terminal 30, extending into the first recess 31 and abutting against the bottom surface 312 of the first recess.

[0223] The first collecting portion 41 and the second collecting portion 42 may be an integral structure. Of course, the first collecting portion 41 and the second collecting portion 42 may also be a split structure, that is, the first collecting portion 41 and the second collecting portion 42 are two separately provided components and are connected into one by bonding, welding, clamping or other means.

[0224] The first current collecting portion 41 can be connected to the first electrode tab 11 by welding, bonding, or other methods. The first current collecting portion 41 is located between the wall portion and the first electrode tab 11. The first current collecting portion 41 can have a large size to ensure the connection area between the first electrode tab 11 and the current collecting member 40 and improve the current flow capacity.

[0225] The second collecting portion 42 may be connected to the bottom surface 312 of the first recess by welding, bonding or other methods.

[0226] The second header 42 may be a solid structure or a hollow structure.

[0227] In this embodiment, the first current collecting portion 41 can be connected to the first electrode tab 11 to ensure the connection strength and current flow capacity between the current collecting member 40 and the first electrode tab 11. The second current collecting portion 42 is protruded from the first current collecting portion 41 and can extend into the first recess 31 and abut against the bottom surface 312 of the first recess, thereby ensuring that the current collecting member 40 is tightly fitted with the bottom surface 312 of the first recess, thereby ensuring the current flow capacity and connection strength between the electrode terminal 30 and the current collecting member 40.

[0228] In some embodiments, the first collecting portion 41 surrounds the outer side of the second collecting portion 42 .

[0229] In some embodiments, a second recess 43 is formed at a position of the current collecting member 40 corresponding to the second current collecting portion 42 , the second recess 43 being recessed from the surface of the first current collecting portion 41 facing the first electrode tab 11 in a direction away from the first electrode tab 11 .

[0230] In this embodiment, the second recess 43 can reduce the strength of the second current collecting portion 42 and improve the elastic deformation capability of the second current collecting portion 42. When the second current collecting portion 42 and the bottom surface 312 of the first recess are abutted against each other, the second current collecting portion 42 can release stress through elastic deformation, thereby reducing the stress transmitted to the first electrode tab 11 and reducing the risk of the first electrode tab 11 being crushed.

[0231] When the battery cell 7 vibrates, the second current collecting portion 42 can also play a buffering role through elastic deformation, thereby reducing the risk of the first electrode tab 11 being crushed.

[0232] In this embodiment, by providing the second recess 43 , the weight of the current collecting member 40 can be reduced, thereby increasing the energy density of the battery cell 7 .

[0233] In some embodiments, the first current collecting portion 41 and the second current collecting portion 42 are formed as an integral structure, which can omit the connection process between the first current collecting portion 41 and the second current collecting portion 42 and reduce the resistance therebetween.

[0234] In some embodiments, the current collector member 40 is made by stamping a metal plate. The metal plate forms a second recess 43 and a second current collecting portion 42 at the pressed positions.

[0235] In some embodiments, in the thickness direction Z of the wall portion, the first current collecting portion 41 is spaced apart from the electrode terminal 30.

[0236] When assembling the electrode terminal 30 and the current collector member 40, the second current collecting portion 42 needs to be pressed against the bottom surface 312 of the first recess; if the first current collecting portion 41 also contacts the electrode terminal 30, there will be over-positioning between the electrode terminal 30 and the current collector member 40, making it difficult to ensure that the second current collecting portion 42 is in close contact with the bottom surface 312 of the first recess. In this embodiment, the first current collecting portion 41 is spaced apart from the electrode terminal 30 to avoid the first current collecting portion 41 interfering with the abutment of the second current collecting portion 42 against the bottom surface 312 of the first recess and ensure the connection strength between the current collector member 40 and the electrode terminal 30.

[0237] In some embodiments, the first current collecting portion 41 abuts against and is welded to the first tab 11, and the second current collecting portion 42 abuts against and is welded to the bottom surface 312 of the first recess.

[0238] In this embodiment, welding can reduce the contact resistance between the first current collecting portion 41 and the first tab 11 and the contact resistance between the second current collecting portion 42 and the electrode terminal 30, and improve the overcurrent capacity.

[0239] In some embodiments, the first current collecting portion 41 and the first tab 11 can be connected by laser welding, and the second current collecting portion 42 and the bottom surface 312 of the first recess can be connected by resistance welding.

[0240] In some embodiments, the electrode assembly 10 has a winding center hole 14, which is configured to correspond to the position of the second current collecting portion 42 and is for an external welding component to pass through to weld the second current collecting portion 42 to the bottom surface 312 of the first recess.

[0241] The electrode assembly 10 is made by winding a first electrode sheet, a second electrode sheet and a separator around a winding tool. After winding and forming, the winding tool is then withdrawn from the electrode assembly 10. After withdrawing the winding tool, a winding center hole 14 is formed in the middle of the electrode assembly 10.

[0242] The winding center hole 14 axially penetrates through the first tab 11, the main body portion 12 and the second tab 13 of the electrode assembly 10.

[0243] In this embodiment, the winding center hole 14 can provide a clearance space for an external welding component, so that the external welding component can pass through the electrode assembly 10 and weld the second current collecting portion 42 to the bottom surface 312 of the first recess.

[0244] In some embodiments, a conductive adhesive is disposed in the first recess 31. The conductive adhesive connects the second current collecting portion 42 and the electrode terminal 30 to achieve electrical connection between the current collecting member 40 and the electrode terminal 30.

[0245] When assembling the electrode terminal 30 and the current collecting member 40, the first recess 31 may be pre-filled with the conductive adhesive. After the second current collecting portion 42 extends into the first recess 31, the second current collecting portion 42 presses the conductive adhesive, and the conductive adhesive connects the second current collecting portion 42 and the electrode terminal 30.

[0246] In this embodiment, the second current collecting portion 42 and the electrode terminal 30 are connected by the conductive adhesive to replace the way of welding the second current collecting portion 42 and the electrode terminal 30, which can reduce the connection difficulty between the second current collecting portion 42 and the electrode terminal 30.

[0247] In some embodiments, the battery cell 7 further includes an insulating sheet 60. The insulating sheet 60 surrounds the outside of the second current collecting portion 42 and is at least partially clamped between the first current collecting portion 41 and the electrode terminal 30.

[0248] In this embodiment, by providing the insulating sheet 60 clamped between the first current collecting portion 41 and the electrode terminal 30, the sealing of the first recess 31 can be achieved, and the risk of leakage of substances in the first recess 31 can be reduced. For example, when the second current collecting portion 42 is welded to the electrode terminal 30, the insulating sheet 60 can seal at least part of the particles generated by the welding in the first recess 31 to reduce the risk of the particles falling into the electrode assembly 10 and reduce potential safety hazards. When the second current collecting portion 42 is connected to the electrode terminal 30 by the conductive adhesive, the insulating sheet 60 can seal the conductive adhesive in the first recess 31 to reduce the risk of the conductive adhesive leaking into the electrode assembly 10 and reduce potential safety hazards.

[0249] In some embodiments, the insulating sheet 60 has elasticity and is configured to elastically deform when being pressed by the first current collecting portion 41 and the electrode terminal 30.

[0250] During the process of pressing the second current collecting portion 42 against the bottom surface 312 of the first recess, the electrode terminal 30 presses the insulating sheet 60, and the insulating sheet 60 can elastically deform to avoid the insulating sheet 60 interfering with the abutment of the second current collecting portion 42 and the bottom surface 312 of the first recess, and ensure the connection strength between the current collecting member 40 and the electrode terminal 30.

[0251] Figure 9 A partial cross-sectional view of the battery cell provided for some other embodiments of the present application.

[0252] As Figure 9 shown, in some embodiments, the second current collecting portion 42 is a solid structure.

[0253] In this embodiment, the second current collector 42 is provided as a solid structure, which can improve the current-carrying capacity of the second current collector 42. The second current collector 42 can be welded to the electrode terminal 30 by resistance welding. During the resistance welding process, the solid-structured second current collector 42 generates more heat, which helps to achieve the welding of the second current collector 42 and the electrode terminal 30 and reduces the welding difficulty between the second current collector 42 and the electrode terminal 30.

[0254] The first current collector 41 and the second current collector 42 can be integrally formed. For example, the solid second current collector 42 can be milled out on a metal plate.

[0255] In some embodiments, the first current collector 41 and the second current collector 42 are separate structures and are connected by welding.

[0256] In this embodiment, the process of welding the first current collector 41 and the second current collector 42 is simple, which helps to save materials and reduce costs. For example, the milling forming method requires milling some materials of the metal plate, which will cause waste of materials; the welding forming method does not need to remove materials, and a larger metal plate and a smaller metal block can be directly welded, which can save materials and reduce costs.

[0257] Figure 10 It is a partial cross-sectional schematic diagram of a battery cell provided in some other embodiments of the present application.

[0258] As Figure 10 shown, in some embodiments, the sealing member 50 further includes a second protrusion 53, which protrudes from the surface of the first sealing portion 51 facing the limiting portion 32 and is disposed around the body portion 33. The second protrusion 53 is used to press against the limiting portion 32 to seal the electrode lead-out hole 21.

[0259] In this embodiment, the second protrusion 53 protrudes from the first sealing portion 51. When the limiting portion 32 and the wall portion clamp the first sealing portion 51, the limiting portion 32 will simultaneously compress the second protrusion 53 and the first sealing portion 51, thereby increasing the compression amount of the sealing member 50 at the second protrusion 53 and improving the sealing performance.

[0260] In some embodiments, the projection of the second protrusion 53 along the thickness direction Z of the wall portion is located within the projection of the flanging structure 34 along the thickness direction Z.

[0261] In this embodiment, the projection of the second protrusion 53 along the thickness direction Z of the wall portion is located within the projection of the flanging structure along the thickness direction Z, so that the limiting portion 32 and the flanging structure can clamp the second protrusion 53 and the first sealing portion 51 from both sides, thereby increasing the compression amount of the sealing member 50 at the second protrusion 53 and improving the sealing performance.

[0262] In some embodiments, in the radial direction of the wall portion, the minimum distance between the second protrusion 53 and the main body portion 33 is smaller than the minimum distance between the second protrusion 53 and the outer edge of the limiting portion 32 .

[0263] In this embodiment, the minimum distance between the second protrusion 53 and the main body 33 is smaller than the minimum distance between the second protrusion 53 and the outer edge of the limiting portion 32. This can reduce the torque applied to the limiting portion 32 and reduce the risk of the limiting portion 32 tilting and deforming.

[0264] Figure 11 A schematic flow chart of a method for assembling a housing and electrode terminals according to some embodiments of the present application.

[0265] like Figure 11 As shown, the assembly method of the housing and the electrode terminal of the embodiment of the present application includes:

[0266] S110. Providing a housing, the housing comprising an integrally formed housing side wall and a housing bottom wall, the housing side wall being disposed around the housing bottom wall, one end of the housing side wall being connected to the housing bottom wall, the other end of the housing side wall forming an opening opposite to the housing bottom wall, and the housing bottom wall being provided with an electrode lead-out hole;

[0267] S120, providing an electrode terminal, wherein one end of the electrode terminal is provided with a first recess;

[0268] S130, installing the electrode terminal in the electrode lead-out hole, and extending one end of the electrode terminal provided with the first recess into the shell, and then folding the side wall of the first recess outward to fix the electrode terminal to the bottom wall of the shell.

[0269] In the assembly method of this embodiment, a first recess is formed at one end of the electrode terminal and the sidewalls of the first recess are folded outward to secure the electrode terminal to the bottom wall of the housing. The portion of the electrode terminal subjected to pressure is the sidewall of the first recess, which is a wall-like structure that is easily folded. This reduces the pressure on the electrode terminal during the molding process, reduces stress concentration, and eases installation. During the process of securing the electrode terminal to the bottom wall of the housing, the sidewalls of the first recess are compressed by external equipment, which reduces the risk of deformation of the bottom surface of the first recess during the folding process.

[0270] In some embodiments, "folding the side wall of the first recess outward" in step S130 includes: extending the first pressure block into the first recess and stretching the side wall of the first recess so that the side wall of the first recess tilts outward; using the second pressure block to squeeze the side wall of the first recess so that the side wall of the first recess is folded toward the bottom wall of the shell.

[0271] If the second pressing block is directly used to press the side wall of the first concave portion, the bending direction of the side wall of the first concave portion is uncertain, and there is a possibility that the side wall of the first concave portion bends into the first concave portion.

[0272] In this embodiment, after the first pressing block extends into the first recess, it gradually expands the side wall of the first recess, so that the side wall of the first recess inclines outward. After the side wall of the first recess inclines outward, the second pressing block can more easily press against the inner wall surface of the side wall of the first recess, so that the side wall of the first recess can be bent along a preset direction.

[0273] It should be noted that for the related structures assembled by the above assembly method, reference can be made to the housing and electrode terminals of the battery cells provided in the above embodiments.

[0274] When assembling the housing and the electrode terminal based on the above assembly method, it is not necessary to perform the steps in sequence as described above. That is to say, the steps can be executed in the order mentioned in the embodiment, or in an order different from that mentioned in the embodiment, or several steps can be executed simultaneously. For example, the execution of steps S110 and S120 is not in sequence and can also be carried out simultaneously.

[0275] Figure 12 It is a schematic block diagram of an assembly device for a housing and an electrode terminal provided in some embodiments of the present application.

[0276] As Figure 12 shown, the assembly device 80 for the housing and the electrode terminal according to the embodiment of the present application includes:

[0277] A first providing device 81 for providing a housing, the housing includes a housing side wall and a housing bottom wall formed integrally, the housing side wall surrounds the housing bottom wall, one end of the housing side wall is connected to the housing bottom wall, the other end of the housing side wall encloses an opening opposite to the housing bottom wall, and the housing bottom wall is provided with an electrode lead-out hole;

[0278] A second providing device 82 for providing an electrode terminal, one end of the electrode terminal is provided with a first recess;

[0279] A first assembling component 83 for installing the electrode terminal in the electrode lead-out hole, and enabling the end of the electrode terminal provided with the first recess to extend into the housing, and then turning outwards the housing side wall of the first recess to fix the electrode terminal to the housing bottom wall.

[0280] In some embodiments, the first assembling component 83 includes a first pressing block 831 and a second pressing block 832. The first pressing block 831 is used to extend into the first recess and expand the side wall of the first recess, so that the side wall of the first recess inclines outward, and the second pressing block 832 is used to squeeze the side wall of the first recess, so that the side wall of the first recess turns towards the housing bottom wall.

[0281] In this embodiment, after the first pressing block 831 extends into the first recess, it gradually expands the side wall of the first recess, causing the side wall of the first recess to incline outward. After the side wall of the first recess inclines outward, the second pressing block 832 can more easily press against the inner wall surface of the side wall of the first recess, enabling the side wall of the first recess to bend along a preset direction.

[0282] For the related structure assembled by the above assembly device, reference can be made to the housing and electrode terminals of the battery cell provided in the above embodiments.

[0283] Figure 13 It is a schematic flowchart of the manufacturing method of the battery cell provided in some embodiments of the present application.

[0284] As Figure 13 shown, the manufacturing method of the battery cell in the embodiment of the present application includes:

[0285] S210. Provide a housing and an electrode terminal. The housing includes a housing side wall and a housing bottom wall formed integrally. The housing side wall surrounds the housing bottom wall. One end of the housing side wall is connected to the housing bottom wall, and the other end of the housing side wall encloses an opening opposite to the housing bottom wall. The housing bottom wall is provided with an electrode lead-out hole, and the electrode terminal is installed in the electrode lead-out hole. The electrode terminal is fixed to the housing bottom wall by forming a first recess at one end extending into the housing and turning over the side wall of the first recess.

[0286] S220. Provide an electrode assembly, and the electrode assembly includes a first tab.

[0287] S230. Provide a current collector member and connect the current collector member to the first tab.

[0288] S240. Install the electrode assembly and the current collector member in the housing, and make the current collector member abut against and connect to the bottom surface of the first recess, and the current collector member is located between the housing bottom wall and the first tab.

[0289] In some embodiments, the electrode assembly has a winding center hole. "Making the current collector member abut against and connect to the bottom surface of the first recess" in step S240 includes: passing a welding component into the housing through the opening and passing through the winding center hole to weld the current collector member and the bottom surface of the first recess.

[0290] In this embodiment, the winding center hole can provide a clearance space for the external welding component, enabling the external welding component to pass through the electrode assembly and weld the current collector member to the bottom surface of the first recess.

[0291] It should be noted that for the related structure of the battery cell manufactured by the above manufacturing method of the battery cell, reference can be made to the battery cells provided in the above embodiments.

[0292] When manufacturing a battery cell based on the above-mentioned battery cell manufacturing method, it is not necessary to follow the above-mentioned steps in sequence. In other words, the steps can be performed in the order mentioned in the embodiment, or in a different order than the order mentioned in the embodiment, or several steps can be performed simultaneously. For example, steps S210 and S220 can be performed in any order and can be performed simultaneously.

[0293] Figure 14 A schematic block diagram of a battery cell manufacturing system provided in some embodiments of the present application.

[0294] like Figure 14 As shown, the battery cell manufacturing system 90 of the embodiment of the present application includes:

[0295] A third providing device 91 is provided, which provides a housing and an electrode terminal. The housing includes an integrally formed housing side wall and a housing bottom wall. The housing side wall is disposed around the housing bottom wall. One end of the housing side wall is connected to the housing bottom wall, and the other end of the housing side wall forms an opening opposite to the housing bottom wall. The housing bottom wall is provided with an electrode lead-out hole. The electrode terminal is mounted in the electrode lead-out hole. The electrode terminal is fixed to the housing bottom wall by forming a first recess at one end extending into the housing and folding the side wall of the first recess outward.

[0296] A fourth providing device 92 is used to provide an electrode assembly, wherein the electrode assembly includes a first electrode tab;

[0297] A fifth providing device 93 is used to provide a current collecting component and connect the current collecting component to the first electrode tab;

[0298] The second assembly component 94 is used to install the electrode assembly and the current collecting member in the shell, and to make the current collecting member abut against and connect with the bottom surface of the first recess, and the current collecting member is located between the bottom wall of the shell and the first electrode tab.

[0299] In some embodiments, the electrode assembly has a winding center hole. The second assembly component 94 includes a welding component 941, which is used to enter the housing from the opening and pass through the winding center hole to weld the current collecting member to the bottom surface of the first recess.

[0300] In this embodiment, the winding center hole can provide an escape space for the welding component 941 , so that the welding component 941 can pass through the electrode assembly and weld the current collecting member to the bottom surface of the first recess.

[0301] The relevant structures of the battery cells manufactured by the above manufacturing system can refer to the battery cells provided in the above embodiments.

[0302] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0303] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, include: An electrode assembly, comprising a first electrode tab, wherein the electrode assembly is a wound structure; A housing for accommodating the electrode assembly, the housing comprising a wall portion, the wall portion being provided with an electrode lead-out hole; an electrode terminal, mounted in the electrode lead-out hole; as well as a current collecting member, located between the wall portion and the first electrode tab and used to connect the electrode terminal and the first electrode tab; The electrode terminal includes a limiting portion and a main body, wherein the limiting portion is located on a side of the wall portion facing away from the first electrode tab, the main body is connected to a surface of the limiting portion facing the wall portion and passes through the electrode lead-out hole, and the main body is provided with a flange structure, which is located on a side of the wall portion facing the electrode assembly, and the limiting portion and the flange structure are used to clamp a portion of the wall portion to fix the electrode terminal to the wall portion; The flange structure is formed by forming a first recess at one end of the main body facing the first tab and folding the sidewall of the first recess outward; The current collecting member abuts against and is connected to the bottom surface of the first recess.

2. The battery cell according to claim 1, wherein: A remaining recess is provided on a side of the main body facing the electrode assembly; the first recess forms the remaining recess after the flanging structure is formed, and the bottom surface of the remaining recess is the bottom surface of the first recess.

3. The battery cell according to claim 1, wherein, In the radial direction of the wall portion, the size of the limiting portion is larger than the size of the flanging structure.

4. The battery cell according to claim 1, characterized in that, In the radial direction of the wall portion, the thickness of at least a portion of the flange structure starting from the outer end surface gradually increases from the outside to the inside.

5. The battery cell according to claim 4, wherein At least a portion of a surface of the flange structure facing the first electrode tab is an inclined surface, and the inclined surface is connected to the outer end surface and inclined toward the electrode assembly.

6. The battery cell according to claim 1, characterized in that, In the thickness direction of the wall portion, the bottom surface of the first recess is closer to the first tab than the inner surface of the wall portion.

7. The battery cell according to claim 1, characterized in that, A sealing member is further included, which is provided between the wall portion and the electrode terminal and is used to seal the electrode lead-out hole.

8. The battery cell according to claim 7, wherein The sealing member includes a first sealing portion surrounding the outer side of the body portion and located between the wall portion and the limiting portion; The electrode terminal further includes a first protrusion protruding from a surface of the limiting portion facing the first sealing portion and arranged around the main body, wherein the first protrusion is used to press against the first sealing portion to seal the electrode lead-out hole; and / or the sealing component further includes a second protrusion protruding from a surface of the first sealing portion facing the limiting portion and arranged around the main body, wherein the second protrusion is used to press against the limiting portion to seal the electrode lead-out hole.

9. The battery cell according to claim 8, characterized in that The projection of the first protrusion along the thickness direction of the wall portion is located within the projection of the flange structure along the thickness direction; and / or A projection of the second protrusion along a thickness direction of the wall portion is located within a projection of the flange structure along the thickness direction.

10. The battery cell according to claim 8, characterized in that In the radial direction of the wall portion, the minimum distance between the first protrusion and the body portion is less than the minimum distance between the first protrusion and the outer edge of the limiting portion; and / or, in the radial direction of the wall portion, the minimum distance between the second protrusion and the body portion is less than the minimum distance between the second protrusion and the outer edge of the limiting portion.

11. The battery cell according to claim 7, wherein The electrode assembly further includes a second tab having a polarity opposite to that of the first tab, and the second tab is electrically connected to the wall portion; The sealing member insulates and separates the wall portion and the electrode terminal.

12. The battery cell according to claim 1, characterized in that, The current collecting member includes a first current collecting portion and a second current collecting portion connected to the first current collecting portion. The first current collecting portion is used to connect the first tab so that the current collecting member and the first tab are electrically connected, and the second current collecting portion is used to connect the electrode terminal so that the current collecting member and the electrode terminal are electrically connected; The second current collecting portion protrudes from the surface of the first current collecting portion facing the electrode terminal to extend into the first recess and abut against the bottom surface of the first recess.

13. The battery cell according to claim 12, characterized in that, A second recess is formed at a position of the current collecting member corresponding to the second current collecting portion, and the second recess is recessed from the surface of the first current collecting portion facing the first tab in a direction away from the first tab.

14. The battery cell according to claim 12, wherein The first current collecting portion and the second current collecting portion are integrally formed structures.

15. The battery cell according to claim 12, characterized in that, The second current collecting portion is a solid structure.

16. The battery cell according to claim 15, wherein, The first current collecting portion and the second current collecting portion are separate structures and are connected by welding.

17. The battery cell according to claim 12, characterized in that, In the thickness direction of the wall portion, the first current collecting portion and the electrode terminal are spaced apart.

18. The battery cell according to claim 12, characterized in that, The first current collecting portion abuts against and is welded to the first tab, and the second current collecting portion abuts against and is welded to the bottom surface of the first recess.

19. The battery cell according to claim 18, wherein, The electrode assembly has a winding center hole, and the winding center hole is configured to correspond to the position of the second current collecting portion and is for an external welding component to pass through to weld the second current collecting portion to the bottom surface of the first recess.

20. The battery cell according to claim 12, characterized in that, A conductive adhesive is disposed in the first recess, and the conductive adhesive connects the second current collecting portion and the electrode terminal to achieve electrical connection between the current collecting member and the electrode terminal.

21. The battery cell according to any one of claims 18-20, characterized in that, An insulating sheet is further included, and the insulating sheet surrounds the outside of the second current collecting portion and is at least partially clamped between the first current collecting portion and the electrode terminal.

22. The battery cell according to claim 21, wherein The insulating sheet has elasticity and is configured to elastically deform when squeezed by the first current collecting portion and the electrode terminal.

23. The battery cell according to claim 1, characterized in that, The surface of the electrode terminal facing away from the first tab is a plane.

24. The battery cell according to claim 1, wherein, The bottom surface of the first recess is a plane.

25. The battery cell according to claim 1, wherein, The housing includes a cover plate and a housing body. The housing body includes an integrally formed housing side wall and a housing bottom wall. The housing side wall surrounds the housing bottom wall, one end of the housing side wall is connected to the housing bottom wall, and the other end of the housing side wall encloses an opening opposite to the housing bottom wall, and the cover plate covers the opening; The wall portion is the housing bottom wall or the cover plate.

26. A battery, characterized in that, It includes a plurality of battery cells according to any one of claims 1-25.

27. An electrical device, characterized in that, It includes a battery according to claim 26, and the battery is used to provide electrical energy.

28. A method for assembling a housing and an electrode terminal, characterized in that, It includes: A housing is provided, the housing comprising an integrally formed housing side wall and a housing bottom wall, the housing side wall being arranged around the housing bottom wall, one end of the housing side wall being connected to the housing bottom wall, the other end of the housing side wall forming an opening opposite to the housing bottom wall, and the housing bottom wall being provided with an electrode lead-out hole; Providing an electrode terminal, the electrode terminal comprising a limiting portion and a body portion connected to the limiting portion, wherein an end of the body portion away from the limiting portion is provided with a first recess; Extending the main body into the electrode lead-out hole, wherein the limiting portion is located on a side of the bottom wall of the housing away from the opening; The side wall of the first recess is folded outward to form a flange structure, and the flange structure is located on the side of the shell bottom wall facing the opening. The limiting portion and the flange structure are used to clamp a part of the shell bottom wall to fix the electrode terminal to the shell bottom wall.

29. The assembly method according to claim 28, characterized in that, The step of folding the side wall of the first concave portion outward to form a flange structure includes: extending the first pressing block into the first recess and propping up the sidewall of the first recess so that the sidewall of the first recess tilts outward; The second pressing block is used to press the side wall of the first recess, so that the side wall of the first recess is folded toward the bottom wall of the shell and forms a flange structure.

30. An assembly device for a housing and an electrode terminal, characterized in that, include: A first providing device is used to provide a housing, the housing comprising an integrally formed housing side wall and a housing bottom wall, the housing side wall being arranged around the housing bottom wall, one end of the housing side wall being connected to the housing bottom wall, the other end of the housing side wall forming an opening opposite to the housing bottom wall, the housing bottom wall being provided with an electrode lead-out hole; A second providing device is used to provide an electrode terminal, wherein the electrode terminal includes a limiting portion and a body portion connected to the limiting portion, and a first recess is provided at an end of the body portion away from the limiting portion; A first assembly component is used to extend the main body into the electrode lead-out hole, fold the side wall of the first recess outward and form a flange structure, wherein the limiting portion is located on the side of the shell bottom wall away from the opening, and the flange structure is located on the side of the shell bottom wall facing the opening, and the limiting portion and the flange structure are used to clamp a part of the shell bottom wall to fix the electrode terminal to the shell bottom wall.

31. The assembling device according to claim 30, wherein, The first assembly component includes a first pressing block and a second pressing block, the first pressing block is used to extend into the first recess and prop up the side wall of the first recess so that the side wall of the first recess tilts outward, and the second pressing block is used to squeeze the side wall of the first recess so that the side wall of the first recess is folded toward the bottom wall of the shell and forms a flange structure.

32. A manufacturing method of a battery cell, characterized in that, include: A housing and an electrode terminal are provided, wherein the housing includes an integrally formed housing side wall and a housing bottom wall, the housing side wall being arranged around the housing bottom wall, one end of the housing side wall being connected to the housing bottom wall, and the other end of the housing side wall forming an opening opposite to the housing bottom wall, the housing bottom wall being provided with an electrode lead-out hole, the electrode terminal including a limiting portion and a main body portion, the limiting portion being located on a side of the housing bottom wall facing away from the opening, the main body portion being connected to a surface of the limiting portion facing the housing bottom wall and passing through the electrode lead-out hole, the main body portion being provided with a flange structure, the flange structure being located on a side of the housing bottom wall facing the opening, the limiting portion and the flange structure being used to clamp a portion of the housing bottom wall to fix the electrode terminal to the housing bottom wall; The flange structure is formed by forming a first recess at one end of the main body facing the opening and folding the side wall of the first recess outward; Providing an electrode assembly, the electrode assembly comprising a first electrode tab; Providing a current collecting component, and connecting the current collecting component to the first electrode tab; The electrode assembly and the current collecting member are installed in the shell, and the current collecting member is abutted against and connected to the bottom surface of the first recess, and the current collecting member is located between the bottom wall of the shell and the first electrode tab.

33. The manufacturing method according to claim 32, characterized in that, The electrode assembly has a winding center hole; The step of abutting and connecting the current collecting member against the bottom surface of the first recess includes inserting a welding member from the opening into the housing and passing through the winding center hole to weld the current collecting member and the bottom surface of the first recess.

34. A manufacturing system for a battery cell, characterized in that, include: A third providing device provides a shell and an electrode terminal, the shell comprising an integrally formed shell side wall and a shell bottom wall, the shell side wall being arranged around the shell bottom wall, one end of the shell side wall being connected to the shell bottom wall, and the other end of the shell side wall forming an opening opposite to the shell bottom wall, the shell bottom wall being provided with an electrode lead-out hole, the electrode terminal comprising a limiting portion and a main body portion, the limiting portion being located on a side of the shell bottom wall facing away from the opening, the main body portion being connected to a surface of the limiting portion facing the shell bottom wall and passing through the electrode lead-out hole, the main body portion being provided with a flange structure, the flange structure being located on a side of the shell bottom wall facing the opening, the limiting portion and the flange structure being used to clamp a portion of the shell bottom wall to fix the electrode terminal to the shell bottom wall; The flange structure is formed by forming a first recess at one end of the main body facing the opening and folding the side wall of the first recess outward; A fourth providing device is used to provide an electrode assembly, wherein the electrode assembly includes a first electrode tab; a fifth providing device, configured to provide a current collecting component and connect the current collecting component to the first electrode tab; The second assembly component is used to install the electrode assembly and the current collecting member in the shell, and to abut and connect the current collecting member with the bottom surface of the first recess, and the current collecting member is located between the bottom wall of the shell and the first electrode tab.

35. The manufacturing system according to claim 34, characterized in that, The electrode assembly has a winding center hole; the second assembly component includes a welding component, and the welding component is used to enter the shell from the opening and pass through the winding center hole to weld the current collector member and the bottom surface of the first recess.

Images