Battery cell, battery, and electrical apparatus

Abstract

A battery cell (10), a battery (100), and an electrical apparatus. The battery cell (10) comprises a housing (11), an electrode assembly (13), an electrode terminal (12) and an adapter (14). The housing (11) has a first wall (110). The electrode terminal (12) is mounted on the first wall (110). The electrode assembly (13) is disposed inside the housing (11). The adapter (14) connects the electrode terminal (12) and the electrode assembly (13). The electrode terminal (12) is provided with a positioning part (15) used to position the adapter (14). The present technical solution can improve battery reliability.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device. The technical solution provided in the present application can improve the reliability of the battery.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell comprising a housing, an electrode assembly, electrode terminals, and an adapter. The housing has a first wall. The electrode terminals are mounted on the first wall. The electrode assembly is disposed within the housing. The adapter connects the electrode terminals and the electrode assembly. The electrode terminals are provided with positioning portions for positioning the adapter.

[0008] In the above scheme, by providing a positioning portion on the electrode terminal, the adapter can be effectively positioned so that the adapter and the electrode terminal can be welded in the correct posture, thereby reducing the risk of internal short circuit of the battery cell due to failure of the electrical connection between the adapter and the electrode terminal due to cold welding (cold welding can be understood as poor welding quality, inadequate welding, etc. between the adapter and the electrode terminal), thereby making the battery have higher reliability.

[0009] According to some embodiments of the present application, the adapter is provided with a positioning fitting portion, and the positioning fitting portion cooperates with the positioning portion.

[0010] In the above solution, by providing a positioning matching portion on the adapter that can cooperate with the positioning portion, the positioning accuracy between the adapter and the electrode terminal can be effectively improved, thereby effectively reducing the risk of failure of the electrical connection between the adapter and the electrode terminal due to cold welding, so that the battery has higher reliability.

[0011] According to some embodiments of the present application, one of the positioning portion and the positioning matching portion includes a positioning groove, and the other includes a positioning protrusion.

[0012] In the above scheme, by defining one of the positioning portion and the positioning matching portion as including a positioning groove and the other as including a positioning protrusion, the adapter and the electrode terminal are positioned and matched with each other through the concave and convex structure, which can effectively improve the positioning accuracy between the adapter and the electrode terminal, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal due to cold welding, so that the battery has higher reliability.

[0013] According to some embodiments of the present application, there are multiple positioning portions and multiple positioning matching portions, the multiple positioning portions are arranged at intervals, and the multiple positioning matching portions correspond one-to-one to the multiple positioning portions.

[0014] In the above solution, by providing multiple positioning parts and multiple positioning matching parts, the positioning accuracy between the adapter and the electrode terminal can be improved, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal due to cold welding, so that the battery has higher reliability.

[0015] According to some embodiments of the present application, the electrode terminal has a first surface facing the electrode assembly along the thickness direction of the first wall. The positioning portion includes a positioning protrusion, which protrudes from the first surface. The positioning protrusion and the first surface jointly define a positioning space. The adapter includes a terminal connecting portion connected to the electrode terminal, and the terminal connecting portion is positioned in the positioning space.

[0016] In the above solution, a positioning protrusion is provided on the first surface of the electrode terminal, and the positioning protrusion and the first surface together form a positioning space, so that the terminal connection portion of the electrode terminal can be positioned in the positioning space. Constrained by the positioning protrusion and the first surface, the adapter is correctly positioned relative to the electrode terminal, allowing the adapter and electrode terminal to be welded in the correct posture, effectively reducing the risk of electrical connection failure between the adapter and electrode terminal due to cold welding, thereby improving the reliability of the battery.

[0017] According to some embodiments of the present application, the positioning protrusion is arranged around the edge of the first surface along the circumference of the first surface, and the positioning protrusion is formed with a notch, which is used to avoid the adapter.

[0018] In the above solution, on the one hand, the positioning protrusions are arranged around the edge of the first surface along the circumference of the first surface, which can constrain the adapter in different orientations, improve the positioning accuracy between the adapter and the electrode terminal, reduce the risk of poor solder joints, and improve battery reliability. On the other hand, by forming a notch, the non-terminal connection portion of the adapter can be located outside the positioning space, thereby facilitating the connection of the adapter to the electrode assembly's tab.

[0019] According to some embodiments of the present application, the positioning protrusion extends along the circumference of the first surface and surrounds the edge portion of the first surface. Along the circumference of the first surface, two ends of the positioning protrusion are spaced apart to form a notch.

[0020] In the above solution, the positioning protrusion can be a ring-shaped structure with a gap extending along the circumference of the first surface, which can constrain the adapter in different orientations, improve the positioning accuracy between the adapter and the electrode terminal, reduce the risk of cold welding, and improve the reliability of the battery.

[0021] According to some embodiments of the present application, the positioning protrusion includes a plurality of sub-positioning protrusions, and the plurality of sub-positioning protrusions are arranged at intervals along the circumference of the first surface, and a gap is formed between two of the plurality of sub-positioning protrusions.

[0022] In the above scheme, by setting a plurality of spaced-apart sub-positioning protrusions, on the one hand, the adapter can be constrained in different orientations, the positioning accuracy between the adapter and the electrode terminal can be improved, the risk of cold welding can be reduced, and the reliability of the battery can be improved; on the other hand, the material of the positioning part can be reduced, which is beneficial to the control of manufacturing costs and battery quality.

[0023] According to some embodiments of the present application, the adapter also includes a tab connection portion for connecting to the tab of the electrode assembly, the terminal connection portion and the tab connection portion are connected to each other, and the width of the tab connection portion is greater than the width of the terminal connection portion.

[0024] In the above scheme, by setting the width of the tab connection portion to be greater than the width of the terminal connection portion, on the one hand, a larger connection area can be provided between the adapter and the tab, reducing the risk of the adapter being detached from the tab, and making the battery more reliable; on the other hand, because the width of the tab connection portion is greater than that of the terminal connection portion, in some embodiments, the portion of the tab connection portion that exceeds the terminal connection portion in the width direction can be used to position the positioning protrusion, thereby improving the positioning accuracy between the adapter and the electrode terminal, reducing the risk of cold welding, and improving the reliability of the battery.

[0025] According to some embodiments of the present application, the electrode terminal has a first surface facing the electrode assembly along the thickness direction of the first wall, and the first surface is formed with a groove. The adapter is welded to the electrode terminal to form a first weld mark, and along the thickness direction of the first wall, the first weld mark does not overlap with the groove.

[0026] In some embodiments, a groove is formed on the first surface of the electrode terminal. To reduce the risk of overlapping the welding position and the groove due to inaccurate positioning of the electrode terminal and the adapter during assembly, causing at least a portion of the first weld mark to fall within the groove, resulting in a cold weld between the electrode terminal and the adapter and causing failure of the electrical connection between the electrode terminal and the adapter, the above solution provides a positioning portion on the electrode terminal to effectively position the adapter, allowing the adapter and the electrode terminal to be welded in the correct posture, thereby reducing the risk of failure of the electrical connection between the adapter and the electrode terminal due to a cold weld, thereby improving the reliability of the battery.

[0027] According to some embodiments of the present application, the first weld mark is arranged around the groove.

[0028] In the above solution, by setting the first weld mark to surround the groove, the connection area between the adapter and the electrode terminal can be increased, the connection stability between the adapter and the electrode terminal can be improved, the risk of electrical connection failure can be reduced, and the battery has higher reliability.

[0029] According to some embodiments of the present application, a flange portion is provided at one end of the electrode terminal facing the electrode assembly along the thickness direction of the first wall, the flange portion being pressed against the inner side surface of the first wall and surrounding the groove. The adapter is welded to the flange portion to form a first weld mark.

[0030] In the above solution, by providing a flange portion at one end of the electrode terminal facing the electrode assembly, the connection stability between the electrode terminal and the first wall can be improved, and the risk of the electrode terminal detaching from the first wall can be reduced, so that the battery has higher reliability.

[0031] According to some embodiments of the present application, the electrode terminal includes a first terminal portion and a second terminal portion that are separately arranged and interconnected, the flange portion and the groove are arranged on the first terminal portion, and the first terminal portion and the second terminal portion are configured to cooperate to clamp the first wall to limit the electrode terminal from detaching from the first wall along the thickness direction of the first wall.

[0032] In the above scheme, by setting the electrode terminal to include a first terminal portion and a second terminal portion that are separately set and interconnected, on the one hand, the difficulty of installing the electrode terminal on the first wall can be effectively reduced, thereby improving the manufacturing efficiency of the battery; on the other hand, compared with the scheme of riveting to the first wall, by setting the first terminal portion and the second terminal portion separately and connecting them to each other, the connection strength between the electrode terminal and the first wall can be improved, thereby reducing the risk of the electrode terminal being detached from the first wall, thereby making the battery have higher reliability.

[0033] According to some embodiments of the present application, the positioning portion includes a positioning protrusion protruding from the first surface.

[0034] In the above solution, by providing a positioning protrusion on the first surface, the adapter can be effectively positioned so that the adapter and the electrode terminal can be welded in the correct posture, reducing the risk of the first weld mark falling into the groove to cause a cold weld, thereby reducing the risk of the electrical connection between the adapter and the electrode terminal failing due to a cold weld, resulting in a short circuit inside the battery cell, and making the battery have higher reliability.

[0035] According to some embodiments of the present application, along the thickness direction of the first wall, the positioning portion and the groove do not overlap.

[0036] In the above solution, by setting the positioning portion so as not to overlap with the groove, that is, the positioning portion is set outside the groove, the adapter can be effectively positioned so that the adapter and the electrode terminal are welded in the correct posture, reducing the risk of the first weld mark falling into the groove to cause a cold weld, thereby reducing the risk of the electrical connection between the adapter and the electrode terminal failing due to a cold weld, resulting in a short circuit inside the battery cell, and making the battery have higher reliability.

[0037] According to some embodiments of the present application, the positioning portion includes a groove, and a convex portion is formed on a side of the adapter facing the electrode terminal, and the convex portion is positioned and matched with the groove.

[0038] In the above scheme, by limiting the positioning portion to include a groove, the groove can be reasonably utilized so that the adapter and the electrode terminal are positioned and matched with each other through the concave and convex structure, which can effectively improve the positioning accuracy between the adapter and the electrode terminal and reduce the interference of the groove on the first weld mark, thereby effectively reducing the risk of electrical connection failure between the adapter and the electrode terminal due to cold welding, so that the battery has higher reliability.

[0039] According to some embodiments of the present application, a recessed portion is formed on a side of the adapter that is away from the electrode terminal, and the recessed portion is arranged corresponding to the protruding portion.

[0040] In the above solution, by forming a recessed portion on the side of the adapter away from the electrode terminal, the mass of the adapter can be effectively reduced and the mass energy density of the battery can be improved.

[0041] According to some embodiments of the present application, the electrode terminal includes a first terminal portion and a second terminal portion that are separately arranged, and the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the first wall. At least a portion of the first terminal portion is located on the side of the first wall facing the electrode assembly, and at least a portion of the second terminal portion is located on the side of the first wall away from the electrode assembly. The first terminal portion and the second terminal portion are configured to cooperate to clamp the first wall to limit the electrode terminal from detaching from the first wall along the thickness direction of the first wall.

[0042] Currently, the electrode terminal can be assembled to the first wall through a riveting process. For example, during the riveting process, the rivet head can press against the end face of the electrode terminal away from the electrode assembly from the outer side of the first wall toward the inner side, thereby forming a flange portion that is pressed against the outer side of the first wall. However, due to the limitations of the riveting process, the area of ​​this flange portion is small, resulting in a weak connection between the electrode terminal and the first wall, and the electrode terminal is easily separated from the first wall, affecting the reliability of the battery.

[0043] To this end, in the above scheme, the electrode terminal is configured to include a first terminal portion and a second terminal portion that are separately arranged and interconnected, so that the electrode terminal can be designed to have a larger area and can be pressed tightly against the first wall, so as to improve the connection strength between the electrode terminal and the first wall, reduce the risk of the electrode terminal being detached from the first wall, and make the battery have higher reliability.

[0044] According to some embodiments of the present application, along a second direction, a projection of the first terminal portion and a projection of the second terminal portion do not overlap, and the second direction is an arbitrary direction perpendicular to the thickness direction of the first wall.

[0045] In the above solution, by setting the projection of the first terminal portion and the projection of the second terminal portion not to overlap, the difficulty of assembling the first terminal portion and the second terminal portion on the first wall can be reduced, the manufacturing efficiency of the battery cell can be improved, and the manufacturing efficiency of the battery can be improved.

[0046] According to some embodiments of the present application, the first terminal portion is provided with a positioning portion.

[0047] In the above solution, by providing a positioning portion on the first terminal portion, the adapter and the electrode terminal can be welded in the correct posture, thereby reducing the risk of internal short circuit of the battery cell due to failure of electrical connection between the adapter and the electrode terminal due to cold welding, thereby making the battery more reliable.

[0048] In a second aspect, some embodiments of the present application further provide a battery, comprising the battery cell provided in the first aspect.

[0049] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery cell as provided in the first aspect, and the battery cell is used to provide electrical energy.

[0050] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0052] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0053] FIG2 is an exploded perspective view of a battery provided in some embodiments of the present application;

[0054] FIG3 is an exploded perspective view of a battery cell in some embodiments of the present application;

[0055] FIG4 is a schematic diagram of a partial structure of a battery cell in some embodiments of the present application;

[0056] FIG5 is a schematic diagram of a partial structure of a battery cell in some other embodiments of the present application;

[0057] FIG6 is a schematic diagram of a first wall, an electrode terminal, and a transition piece in some other embodiments of the present application;

[0058] FIG7 is a schematic diagram of a first wall, an electrode terminal, and a transition piece in some other embodiments of the present application;

[0059] FIG8 is a schematic diagram of the internal structure of the first wall, the electrode terminal, and the adapter in some embodiments of the present application;

[0060] FIG9 is a schematic diagram of the internal structure of the first wall, electrode terminals, and adapters in other embodiments of the present application;

[0061] FIG10 is a schematic diagram of a partial structure of a battery cell in some embodiments of the present application.

[0062] Icons: 10 - battery cell; 11 - housing; 110 - first wall; 1100 - mounting hole; 111 - housing; 12 - electrode terminal; 120 - first surface; 1200 - groove; 1201 - first side; 1202 - second side; 1203 - third side; 121 - flange portion; 122 - first terminal portion;

[0063] 123 - second terminal portion; 13 - electrode assembly; 14 - adapter; 140 - terminal connection portion; 141 - tab connection portion; 142 - intermediate connection portion; 143 - convex portion; 144 - concave portion; 15 - positioning portion; 150 - positioning protrusion; 1500 - sub-positioning protrusion; 151 - positioning space; 152 - notch; 16 - positioning mating portion; 160 - positioning groove; 17 - first weld mark; 18 - insulating member; 19 - insulating member; z - thickness direction of first wall;

[0064] 1000-Vehicle; 100-Battery; 200-Controller; 300-Motor; 20-Box; 21-First Box Body; 22-Second Box Body. DETAILED DESCRIPTION

[0065] 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.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0067] 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.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0070] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0071] The term "plurality" used in this application refers to two or more (including two).

[0072] In this application, battery cells may include lithium-ion battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A battery cell includes a housing, an electrode assembly, and an electrolyte. The electrode assembly is located within the housing. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector protrudes from the coated current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector, serving as the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator provides electronic insulation, separating the adjacent positive and negative electrodes to prevent short circuits. The separator has numerous micropores that allow the free passage of electrolyte ions and offers excellent permeability to lithium ions.

[0075] In some embodiments, the first wall of the housing is mounted with electrode terminals, which are connected to the tabs via adapters to enable external charging and discharging of the battery cells.

[0076] Improving battery reliability is a pressing technical challenge in the development of battery technology. Battery cells often experience electrical connection failure between the electrode terminals and the adapter, leading to internal short circuits in the battery cells and compromising battery reliability. During battery manufacturing, the lack of a positioning structure between the electrode terminals and the adapter can lead to inaccurate welding positions and poor soldering between the electrode terminals and the adapter, resulting in electrical connection failure between the two, impacting battery reliability.

[0077] In view of this, to improve the problem of poor solder joints between electrode terminals and adapters, which can lead to electrical connection failure between the electrode terminals and the adapter and thus affect battery reliability, some embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, and an adapter. The housing has a first wall. The electrode terminals are mounted on the first wall. The electrode assembly is disposed within the housing. The adapter connects the electrode terminals and the electrode assembly. The electrode terminals are provided with positioning portions for positioning the adapter.

[0078] In the above solution, by providing a positioning portion on the electrode terminal, the adapter can be effectively positioned so that the adapter and the electrode terminal can be welded in the correct posture, thereby reducing the risk of failure of the electrical connection between the adapter and the electrode terminal due to cold welding, resulting in internal short circuit of the battery cell, and making the battery have higher reliability.

[0079] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0080] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0081] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0082] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0083] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to FIG. 2 , which is a three-dimensional exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and a battery cell 10 . The battery cell 10 is used to be accommodated in the box body 20 .

[0085] The housing 20 is used to provide assembly space for the battery cells 10 and can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing body 21 and a second housing body 22. The first housing body 21 and the second housing body 22 cover each other, and the first housing body 21 and the second housing body 22 jointly define an assembly space for accommodating the battery cells 10. The second housing body 22 can be a hollow structure with one end open. The first housing body 21 can be a plate-like structure, and the first housing body 21 covers the open side of the second housing body 22, so that the first housing body 21 and the second housing body 22 jointly define the assembly space. The first housing body 21 and the second housing body 22 can also be hollow structures with one end open, and the open side of the first housing body 21 covers the open side of the second housing body 22.

[0086] Of course, the box body 20 formed by the first box body 21 and the second box body 22 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 20 is in the shape of a cuboid.

[0087] In the battery 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, the multiple battery cells 10 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 10 being connected both in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 20.

[0088] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10 .

[0089] Each battery cell 10 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 may be cylindrical, prismatic, or in other shapes.

[0090] Some embodiments of the present application provide a battery cell 10 , please refer to FIG3 and FIG4 , FIG3 is a three-dimensional exploded view of the battery cell 10 in some embodiments of the present application, and FIG4 is a schematic diagram of the partial structure of the battery cell 10 in some embodiments of the present application.

[0091] The battery cell 10 includes a housing 11, an electrode assembly 13, an electrode terminal 12, and an adapter 14. The housing 11 has a first wall 110. The electrode terminal 12 is mounted on the first wall 110. The electrode assembly 13 is disposed within the housing 11. The adapter 14 connects the electrode terminal 12 and the electrode assembly 13. The electrode terminal 12 is provided with a positioning portion 15 for positioning the adapter 14.

[0092] The housing 11 is a component for accommodating the electrode assembly 13. The housing 11 can also be used to accommodate an electrolyte, such as an electrolyte. Referring to Figure 3, in some embodiments, the housing 11 includes a shell 111 and an end cap. A accommodating cavity is formed inside the shell 111, and the accommodating cavity is used to accommodate the electrode assembly 13. The shell 111 has an opening connected to the accommodating cavity. The end cap is covered at the opening of the shell 111 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 13 and the electrolyte. Optionally, the housing 11 may also include a bottom plate, and openings are respectively formed at both ends of the shell 111, one of the openings is closed by the end cap, and the other opening is closed by the bottom plate.

[0093] In some embodiments, the material of the shell 11 can be metal or a combination of metal and non-metal. For example, the shell 11 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy; for example, part of the shell 11 can be made of metal, and the rest can be made of non-metal, such as the end cover of the shell 11 can be made of metal, and the shell 111 or other parts of the shell 11 can be made of non-metallic materials.

[0094] In some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and the housing 111 may be filled with electrolyte, and then the end cap may be attached to the opening of the housing 111 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 13 may be placed in the housing 111 first, and then the end cap may be attached to the opening of the housing 111, and then the housing 111 may be filled with electrolyte through the injection hole on the end cap or other part of the housing 11, and then the injection hole may be closed to complete the assembly of the battery cell 10.

[0095] The housing 11 can have various shapes, such as a cylindrical or prismatic structure. The shape of the housing 11 can be determined based on the specific shape of the electrode assembly 13. For example, if the electrode assembly 13 is cylindrical, a cylindrical housing 11 can be used; if the electrode assembly 13 is square, a square housing 11 can be used.

[0096] The first wall 110 is a portion of the outer shell 11. The electrode terminal 12 can be mounted on the first wall 110. The electrode terminal 12 can be connected to the tab of the electrode assembly 13 via the adapter 14. In some embodiments, the first wall 110 can be mounted to the electrode terminal 12 in an insulated manner. For example, an insulating member 18 is disposed between the electrode terminal 12 and the first wall 110. The insulating member 18 insulates and isolates the electrode terminal 12 from the first wall 110. In some embodiments, the first wall 110 can be mounted to the electrode terminal 12, for example, the first wall 110 is directly mounted to the electrode terminal 12. In this case, the first wall 110 can be made of a conductive material or an insulating material.

[0097] In some embodiments, the first wall 110 can be made of a conductive material, such as a metal material, for example, the first wall 110 is made of aluminum, copper, iron, aluminum, steel, or an aluminum alloy. In other embodiments, the first wall 110 can be made of a non-metallic material, such as plastic.

[0098] In some embodiments, the first wall 110 may be an end cap of the housing 11. The housing 111 of the housing 11 is disposed around the edge of the first wall 110. The first wall 110 may be connected to the housing 111 of the housing 11 by welding, bonding, snapping, or other connection methods. Alternatively, the first wall 110 and the housing 111 may be integrally formed.

[0099] The electrode terminal 12 is a component mounted on the first wall 110. The electrode terminal 12 can be connected to the tab of the electrode assembly 13 via an adapter 14, allowing current to flow into or out of the tab through the electrode terminal 12. In some embodiments, the electrode terminal 12 can have a cylindrical structure or a polygonal prismatic structure. In some embodiments, the electrode terminal 12 is made of a metal material, such as aluminum, copper, iron, steel, an alloy, or a composite metal.

[0100] The electrode assembly 13 is the component within the battery cell 10 where the electrochemical reaction occurs. The electrode assembly 13 can have various structures. For example, the electrode assembly 13 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, with the main body of the electrode assembly 13 being cylindrical. The separator can be made of at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The tabs of the electrode assembly 13 can include a first tab and a second tab of opposite polarity. In some embodiments, the electrode terminal 12 of the battery cell 10 can be configured to correspond to the first tab, such as by connecting the electrode terminal 12 to the first tab via an adapter 14. In some embodiments, the electrode terminal 12 of the battery cell 10 can be configured to correspond to the second tab, such as by connecting the electrode terminal 12 to the second tab via an adapter 14. In some embodiments, the battery cell 10 can have two electrode terminals 12, one of which can correspond to the first tab and the other can correspond to the second tab. In some embodiments of the present application, the battery cell 10 includes two electrode terminals 12, which are spaced apart and arranged on the first wall 110. The following description will take one of the electrode terminals 12 as an example.

[0101] The adapter 14 is a component that connects the electrode assembly 13 and the electrode terminal 12. For example, the adapter 14 connects the tab of the electrode assembly 13 and the electrode terminal 12. The adapter 14 can be located on the inner side of the first wall 110. This can be understood as the entire adapter 14 being located on the inner side of the first wall 110. In the thickness direction of the first wall 110, the adapter 14 does not interfere with the first wall 110, thereby reducing the risk of overlapping between the adapter and the first wall 110 and causing an internal short circuit in the battery. At the same time, the location of the adapter 14 on the inner side of the first wall 110 also facilitates the positioning and assembly of the adapter 14 and the electrode terminal 12, thereby improving the assembly efficiency of the battery cell.

[0102] In some embodiments, see 4, the adapter 14 may include a terminal connection portion 140 and a tab connection portion 141 connected to each other, wherein the terminal connection portion 140 is connected to the electrode terminal 12, and the tab connection portion 141 is connected to the tab of the electrode assembly 13. The terminal connection portion 140 can be welded to the electrode terminal 12, for example, the terminal connection portion 140 and the electrode terminal 12 can be connected by laser welding. In some embodiments, the electrode terminal 12 is made of a metal material, such as aluminum, copper, iron, steel, an alloy, or a composite metal.

[0103] In some embodiments, an insulating member 19 may be further provided on the first wall 110 , and the insulating member 19 may be used to insulate and isolate the adapter 14 from the first wall 110 .

[0104] The positioning portion 15 is a component provided on the electrode terminal 12. The positioning portion 15 is used to position the adapter 14. Positioning the adapter 14 includes positioning the adapter 14 so that the relative positional relationship between the adapter 14 and the electrode terminal 12 is at a preset position, so that when welding the adapter 14 and the electrode terminal 12, the weld mark is in the correct position, so that the welding quality and connection stability of the adapter 14 and the electrode terminal 12 are high. Here, "the relative positional relationship between the adapter 14 and the electrode terminal 12 is at a preset position" can be understood as not being at a preset position. For example, in some embodiments, a groove 1200 is formed on the surface of the electrode terminal 12 facing the adapter 14. When the adapter 14 and the electrode terminal 12 are not positioned in place, there is a possibility that the laser action position falls within the groove 1200 during welding, causing part of the weld mark to fall within the groove 1200. This situation can cause the adapter 14 and the electrode terminal 12 to be poorly welded, resulting in low welding quality and failure of the connection between the adapter 14 and the electrode terminal 12. For another example, in some embodiments, when the adapter 14 and the electrode terminal 12 are not positioned in place, there is a situation where the laser action position during welding falls outside the adapter 14 and / or the electrode terminal 12, causing part of the weld mark to fall outside the adapter 14 and / or the electrode terminal 12. This situation may cause a poor weld between the adapter 14 and the electrode terminal 12, resulting in low welding quality and failure of the connection between the adapter 14 and the electrode terminal 12.

[0105] In some embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 12, which is used to constrain the adapter 14 to position the adapter 14. For example, the wall surface of the protrusion can constrain the wall surface of the adapter 14 to achieve the positioning of the adapter 14. In other embodiments, the positioning portion 15 may include a protrusion and / or a recessed groove, and the adapter 14 is correspondingly provided with a recessed groove and / or a protrusion, and the positioning portion 15 and the adapter 14 are positioned by cooperating with a concave-convex structure. In other embodiments, the positioning portion 15 may include a protrusion provided on the electrode terminal 12, which is used to constrain the adapter 14 to position the adapter 14; and the positioning portion 15 may include a protrusion and / or a recessed groove, and the adapter 14 is correspondingly provided with a recessed groove and / or a protrusion, and the positioning portion 15 and the adapter 14 are positioned by cooperating with a concave-convex structure.

[0106] In the above solution, by providing a positioning portion 15 on the electrode terminal 12, the adapter 14 can be effectively positioned so that the adapter 14 and the electrode terminal 12 are welded in a correct posture, thereby reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, resulting in internal short circuit of the battery cell 10, so that the battery has higher reliability.

[0107] According to some embodiments of the present application, referring to FIG. 4 , the adapter 14 is provided with a positioning fitting portion 16 , and the positioning fitting portion 16 cooperates with the positioning portion 15 .

[0108] The positioning matching portion 16 is a component provided on the adapter 14 , and is used to cooperate with the positioning portion 15 to position the adapter 14 .

[0109] In some embodiments, the positioning portion 15 and the positioning and matching portion 16 may include mutually cooperating concave and convex structures, such as a recessed groove and a protrusion, a latch and a latch hole, etc. For example, referring to FIG4 , the positioning portion 15 may include a protrusion provided on the end surface of the electrode terminal 12 facing the adapter 14 , and the positioning and matching portion 16 may include a recessed groove or a through hole provided on the adapter 14 .

[0110] In the above solution, by providing a positioning matching portion 16 on the adapter 14 that can cooperate with the positioning portion 15, the positioning accuracy between the adapter 14 and the electrode terminal 12 can be effectively improved, thereby effectively reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, so that the battery has higher reliability.

[0111] According to some embodiments of the present application, one of the positioning portion 15 and the positioning matching portion 16 includes a positioning groove 160 , and the other includes a positioning protrusion 150 .

[0112] The positioning mating portion 16 and the positioning portion 15 comprise mating concave and convex structures. The positioning protrusion 150 may be a block-shaped structure protruding from the electrode terminal 12. The positioning protrusion 150 may be cylindrical, prismatic, or have other shapes. The positioning groove 160 is a groove-like structure that mates with the positioning protrusion 150. The positioning groove 160 may be a blind hole formed on the surface of the adapter 14 facing the electrode terminal 12, or it may be a through hole formed in the adapter 14.

[0113] In some embodiments, the positioning portion 15 includes a positioning protrusion 150, and the positioning mating portion 16 includes a positioning groove 160. In some embodiments, the positioning portion 15 may include a positioning groove 160, and the positioning mating portion 16 may include a positioning protrusion 150. In other embodiments, the positioning portion 15 may include a positioning groove 160 and a positioning protrusion 150, and the positioning mating portion 16 may include a positioning protrusion 150 and a positioning groove 160, wherein the positioning groove 160 of the positioning portion 15 cooperates with the positioning protrusion 150 of the positioning mating portion 16, and the positioning protrusion 150 of the positioning portion 15 cooperates with the positioning groove 160 of the positioning mating portion 16.

[0114] In some embodiments, when the positioning portion 15 includes a positioning protrusion 150, the material of the positioning protrusion 150 can be the same as or different from the material of the electrode terminal 12. For example, the positioning protrusion 150 is made of a metal material, such as aluminum, copper, iron, steel, alloy, or composite metal. For another example, the positioning protrusion 150 is made of a non-metallic material, such as plastic. In some embodiments, the positioning protrusion 150 can be connected to the electrode terminal 12 by bonding, welding, screw connection, etc. In other embodiments, the positioning protrusion 150 can also be manufactured integrally with the electrode terminal 12. In some embodiments, when the positioning portion 15 includes a positioning groove 160, the positioning groove 160 can be formed in the electrode terminal 12 by a stamping process, a hollowing process, or other processes, or the positioning groove 160 can be formed based on the formation of the electrode terminal 12, for example, when the electrode terminal 12 is formed by casting, the positioning groove 160 is formed at the same time. Alternatively, the electrode terminal 12 is formed on the electrode terminal 12 during assembly on the first wall 110 . For example, the electrode terminal 12 is fixed to the first wall 110 by riveting, and the positioning groove 160 is a groove 1200 formed by the riveting process.

[0115] In some embodiments, when the positioning mating portion 16 includes a positioning protrusion 150, the material of the positioning protrusion 150 can be the same as or different from the material of the adapter 14. For example, the positioning protrusion 150 is made of a metal material, such as aluminum, copper, iron, steel, alloy, or composite metal. For another example, the positioning protrusion 150 is made of a non-metallic material, such as plastic. In some embodiments, the positioning protrusion 150 can be connected to the adapter 14 by bonding, welding, screw connection, etc. In other embodiments, the positioning protrusion 150 can also be manufactured integrally with the adapter 14. In some embodiments, when the positioning portion 15 includes a positioning groove 160, the positioning groove 160 can be formed in the adapter 14 by stamping, digging, or other processes, or the positioning groove 160 can be formed based on the formation of the adapter 14. For example, if the adapter 14 is formed by casting, the positioning groove 160 is formed when the adapter 14 is cast.

[0116] In the above scheme, by limiting one of the positioning portion 15 and the positioning matching portion 16 to include a positioning groove 160 and the other to include a positioning protrusion 150, the adapter 14 and the electrode terminal 12 are positioned and matched with each other through the concave and convex structure, which can effectively improve the positioning accuracy between the adapter 14 and the electrode terminal 12, thereby effectively reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, so that the battery has higher reliability.

[0117] According to some embodiments of the present application, referring to FIG. 4 , there are multiple positioning portions 15 and multiple positioning matching portions 16 , the multiple positioning portions 15 are arranged at intervals, and the multiple positioning matching portions 16 correspond one-to-one to the multiple positioning portions 15 .

[0118] In some embodiments, the number of the positioning portions 15 can be two, three, or more. Correspondingly, the number of the positioning and matching portions 16 can also be two, three, or more. The corresponding number of positioning portions 15 and positioning and matching portions 16 cooperate with each other.

[0119] “A plurality of positioning portions 15 are arranged at intervals” can be understood as that the positioning portions 15 are spaced apart from each other and are independent of each other, so as to achieve different positioning points between the adapter 14 and the electrode terminal 12 .

[0120] For example, referring to FIG4 , a groove 1200 is formed on the end surface of the electrode terminal 12 facing the adapter 14 , and the positioning portion 15 includes two positioning protrusions 150 , which are spaced apart on the periphery of the groove 1200 , for example, the two positioning protrusions 150 are symmetrically arranged based on the groove 1200 .

[0121] In the above solution, by providing multiple positioning portions 15 and multiple positioning matching portions 16, the positioning accuracy between the adapter 14 and the electrode terminal 12 can be improved, thereby effectively reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, so that the battery has higher reliability.

[0122] According to other embodiments of the present application, please refer to Figures 5 and 6. Figure 5 is a schematic diagram of the partial structure of the battery cell 10 in other embodiments of the present application, and Figure 6 is a schematic diagram of the first wall 110, the electrode terminal 12 and the adapter 14 in other embodiments of the present application.

[0123] Along the thickness direction z of the first wall, the electrode terminal 12 has a first surface 120 facing the electrode assembly 13. The positioning portion 15 includes a positioning protrusion 150, which protrudes from the first surface 120. The positioning protrusion 150 and the first surface 120 together define a positioning space 151. The adapter 14 includes a terminal connecting portion 140 connected to the electrode terminal 12, and the terminal connecting portion 140 is positioned in the positioning space 151.

[0124] The first surface 120 is the surface of the electrode terminal 12 that faces the electrode assembly 13 in the thickness direction z of the first wall. The first surface 120 can be used to connect to the adapter 14. For example, the first surface 120 can be welded to the adapter 14. In some embodiments, the first surface 120 can be the bottom surface of the electrode terminal 12.

[0125] The terminal connection portion 140 is a portion where the adapter 14 is connected to the electrode terminal 12 . The terminal connection portion 140 can be welded to the first surface 120 .

[0126] The phrase "positioning portion 15 includes positioning protrusion 150" can be understood as meaning that positioning portion 15 includes at least positioning protrusion 150, for example, positioning portion 15 includes a positioning protrusion, and may also include other structures for positioning adapter 14. Positioning protrusion 150 is a component that protrudes from first surface 120. Positioning protrusion 150 and first surface 120 can together form a positioning space 151. When assembling adapter 14 and electrode terminal 12, terminal connection portion 140 of adapter 14 can be positioned in positioning space 151, first surface 120 can contact the surface of terminal connection portion 140, and positioning protrusion 150 can connect to the side surface of the terminal connection.

[0127] In the above solution, a positioning protrusion 150 is provided on the first surface 120 of the electrode terminal 12, and the positioning protrusion 150 and the first surface 120 together form a positioning space 151, so that the terminal connection portion 140 of the electrode terminal 12 can be positioned in the positioning space 151. Constrained by the positioning protrusion 150 and the first surface 120, the adapter 14 can be positioned correctly relative to the electrode terminal 12, allowing the adapter 14 and the electrode terminal 12 to be welded in the correct posture, thereby effectively reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, thereby ensuring higher reliability of the battery.

[0128] According to some embodiments of the present application, in combination with FIG. 5 and FIG. 6 , along the circumference of the first surface 120 , a positioning protrusion 150 is disposed around the edge of the first surface 120 , and a notch 152 is formed in the positioning protrusion 150 , and the notch 152 is used to avoid the adapter 14 .

[0129] The first surface 120 may be the portion where the electrode terminal 12 is connected to the adapter 14. The positioning protrusion 150 is disposed around the edge of the first surface 120, which can be understood as the positioning protrusion 150 being disposed around a portion of the wall surface where the adapter 14 is connected to the electrode terminal 12, so as to contact the wall surface of the adapter 14 to position the adapter 14.

[0130] The positioning protrusion 150 is formed in the notch 152. It can be understood that the positioning protrusion 150 does not completely surround the first surface 120, and the notch 152 can be left to avoid the portion of the adapter 14 that is not connected to the electrode terminal 12. Exemplarily, the adapter 14 can include a terminal connecting portion 140 and a tab connecting portion 141. The terminal connecting portion 140 is located in the positioning space 151, and the tab connecting portion 141 avoids the notch 152 and is located outside the positioning space 151 to connect with the tab of the electrode assembly 13.

[0131] In some embodiments, referring to FIG6 , the first surface 120 may be square, and the positioning protrusions 150 extend along the edge of the first surface 120 and are disposed on three sides of the first surface 120. The other side of the first surface 120 is not provided with the positioning protrusions 150 to form a notch 152. In other embodiments, the first surface 120 may be square, and the positioning protrusion 150 includes a plurality of sub-protrusions, which are arranged at intervals along the edge of the first surface 120. For example, the positioning protrusion 150 includes three sub-protrusions, which are respectively disposed on three sides of the first surface 120. The other side of the first surface 120 is not provided with a sub-protrusion to form a notch 152.

[0132] In the above solution, on the one hand, the positioning protrusion 150 is disposed along the circumference of the first surface 120 around the edge of the first surface 120, which can constrain the adapter 14 in different orientations, improve the positioning accuracy between the adapter 14 and the electrode terminal 12, reduce the risk of false soldering, and improve the reliability of the battery. On the other hand, by forming the notch 152, it is convenient for the part of the non-terminal connection portion 140 of the adapter 14 to be located outside the positioning space 151, so that the adapter 14 can be connected to the tab of the electrode assembly 13.

[0133] According to some embodiments of the present application, referring to FIG. 6, the positioning protrusion 150 extends along the circumference of the first surface 120 and surrounds the edge portion of the first surface 120. Along the circumference of the first surface 120, the two ends of the positioning protrusion 150 are spaced apart and form a notch 152.

[0134] In some embodiments, the first surface 120 may be square. The positioning protrusion 150 extends along the circumference of the first surface 120, which can be understood that the extension trajectory of the positioning protrusion 150 can be part of a square trajectory. For example, in FIG. 6, the positioning protrusion 150 extends along three interconnected edges of the first surface 120, and the positioning protrusion 150 has a "匚" - shaped structure. In other embodiments, the first surface 120 may be circular. The positioning protrusion 150 extends along the circumference of the first surface 120, which can be understood that the extension trajectory of the positioning protrusion 150 can be part of a circular trajectory, and the positioning protrusion 150 is arc - shaped.

[0135] Referring to FIG. 6, the positioning protrusion 150 is an integral structure, which may include a first segment, a second segment, and a third segment connected to each other. The two opposite ends of the first segment are respectively connected to the second segment and the third segment, and the first segment, the second segment, and the third segment respectively contact different wall surfaces of the terminal connection portion 140. [[ID=,10]] <00,00276>In the above solution, the positioning protrusion 150 may be an annular structure with a notch 152 extending along the circumference of the first surface 120, which can constrain the adapter 14 in different orientations, improve the positioning accuracy between the adapter 14 and the electrode terminal 12, reduce the risk of false soldering, and improve the reliability of the battery.

[0137] According to some embodiments of the present application, referring to FIG. 7, FIG. 7 is a schematic diagram of the first wall 110, the electrode terminal 12, and the adapter 14 in some other embodiments of the present application.

[0138] The positioning protrusion 150 includes a plurality of sub - positioning protrusions 1500. The plurality of sub - positioning protrusions 1500 are spaced along the circumference of the first surface 120, and a notch 152 is formed between two of the plurality of sub - positioning protrusions 1500.

[0139] The sub-positioning protrusions 1500 can be independent protrusions. Multiple independent sub-positioning protrusions 1500 are arranged at intervals along the circumference of the first surface 120 and can contact different wall surfaces of the terminal connecting portion 140 to position the adapter 14. For example, referring to Figure 7, the first surface 120 is square and can include a first side 1201, a second side 1202, and a third side 1203. The first side 1201 is the edge of the first surface 120 along the length direction of the first wall 110, and the first side 1201 is away from the middle of the first wall 110. The second side 1202 and the third side 1203 are two edges in the width direction of the first wall 110. There are three sub-positioning protrusions 1500, and the three sub-positioning protrusions 1500 are respectively arranged on the first side 1201, the second side 1202, and the third side 1203.

[0140] In the above scheme, by setting a plurality of spaced-apart sub-positioning protrusions 1500, on the one hand, the adapter 14 can be constrained in different orientations, thereby improving the positioning accuracy between the adapter 14 and the electrode terminal 12, reducing the risk of cold welding, and improving the reliability of the battery; on the other hand, the material of the positioning portion 15 can be reduced, which is beneficial to the control of manufacturing costs and battery quality.

[0141] According to some embodiments of the present application, see Figure 6 . The adapter 14 further includes a tab connection portion 141 for connecting to the tab of the electrode assembly 13 . The terminal connection portion 140 and the tab connection portion 141 are interconnected, and the width of the tab connection portion 141 is greater than that of the terminal connection portion 140 .

[0142] The adapter 14 includes a terminal connection portion 140 and a tab connection portion 141. The terminal connection portion 140 is connected to the electrode terminal 12, for example, by welding the terminal connection portion 140 to the first surface 120 of the electrode terminal 12. The tab connection portion 141 is connected to the tab of the electrode assembly 13, for example, by welding the tab connection portion 141 to the tab.

[0143] The terminal connection portion 140 and the tab connection portion 141 may be disposed along the length direction of the adapter 14. The width direction of the adapter 14 may be perpendicular to the length direction of the adapter 14.

[0144] “The width of the tab connection portion 141 is greater than the width of the terminal connection portion 140 ” can be understood as that, in the width direction of the adapter 14 , the size of the tab connection portion 141 is greater than the size of the terminal connection portion 140 .

[0145] In some embodiments, referring to FIG6 , the adapter 14 may further include an intermediate connecting portion 142 , which connects the terminal connecting portion 140 and the tab connecting portion 141 . The width of the intermediate connecting portion 142 may be greater than the width of the terminal connecting portion 140 . The intermediate connecting portion 142 has an abutting surface facing the positioning protrusion 150 , which may be used to abut against the positioning protrusion 150 , thereby improving the positioning accuracy of the adapter 14 compared to the electrode terminal 12 .

[0146] In the above scheme, by setting the width of the tab connection portion 141 to be greater than the width of the terminal connection portion 140, on the one hand, a larger connection area can be provided between the adapter 14 and the tab, reducing the risk of the adapter 14 being separated from the tab, so that the battery has higher reliability; on the other hand, because the width of the tab connection portion 141 is greater than that of the terminal connection portion 140, in some embodiments, the portion of the tab connection portion 141 that exceeds the terminal connection portion 140 in the width direction can be used to position the positioning protrusion 150, thereby improving the positioning accuracy between the adapter 14 and the electrode terminal 12, reducing the risk of cold welding, and improving the reliability of the battery.

[0147] In some other embodiments, the width of the tab connection portion 141 may be less than or equal to the width of the terminal connection portion 140 .

[0148] According to some embodiments of the present application, referring to Figures 4 and 5 , along the thickness direction z of the first wall, the electrode terminal 12 has a first surface 120 facing the electrode assembly 13, and a groove 1200 is formed on the first surface 120. The adapter 14 is welded to the electrode terminal 12 to form a first weld mark 17. Along the thickness direction z of the first wall, the first weld mark 17 does not overlap with the groove 1200.

[0149] The first surface 120 may be a surface of the electrode terminal 12 facing the electrode assembly 13 . The first surface 120 may be welded to the adapter 14 to form a first weld mark 17 .

[0150] The groove 1200 is a groove-like structure formed on the first surface 120. In some embodiments, to improve the mass energy density of the battery cell 10, a groove may be cut on the surface to reduce the mass of the electrode terminal 12. In some embodiments, the surface of the electrode terminal 12 is formed with the groove 1200 due to assembly process factors. For example, the electrode terminal 12 may be riveted to the first wall 110. During the riveting process, the rivet head presses against the first surface 120 from the inner side of the first wall 110 toward the outer side, thereby forming a flange portion 121 that is pressed against the inner side of the first wall 110. The rivet groove formed by the riveting process is the groove 1200 formed on the first surface 120.

[0151] “Along the thickness direction z of the first wall, the first weld mark 17 does not overlap with the groove 1200 ” can be understood as that when welding the adapter 14 and the electrode terminal 12 , the portion where the laser acts on the adapter 14 and the electrode terminal 12 does not overlap with the groove 1200 .

[0152] In order to ensure that "the first weld mark 17 does not overlap with the groove 1200 along the thickness direction z of the first wall", the battery cell 10 is provided with a positioning portion 15 to improve the positioning accuracy of the adapter 14 and the electrode terminal 12, and reduce the risk of the laser acting on the adapter 14 and the electrode terminal 12 overlapping with the groove 1200, resulting in a cold weld.

[0153] In some embodiments, a groove 1200 is formed on the first surface 120 of the electrode terminal 12. To reduce the risk of overlapping the welding position and the groove 1200 due to inaccurate positioning of the electrode terminal 12 and the adapter 14 during assembly, so that at least a portion of the first weld mark 17 falls into the groove 1200, resulting in a cold weld between the electrode terminal 12 and the adapter 14 and causing failure of the electrical connection between the electrode terminal 12 and the adapter 14, in the above solution, by providing a positioning portion 15 on the electrode terminal 12, the adapter 14 can be effectively positioned, so that the adapter 14 and the electrode terminal 12 are welded in a correct posture, thereby reducing the risk of failure of the electrical connection between the adapter 14 and the electrode terminal 12 due to a cold weld, and thus making the battery have higher reliability.

[0154] According to some embodiments of the present application, referring to FIG. 5 , the first weld mark 17 is disposed around the groove 1200 .

[0155] For example, FIG5 illustrates the shape of the first weld mark 17 in a ring-shaped pattern. The first weld mark 17 can be ring-shaped and disposed around the groove 1200. In some embodiments, the first weld mark 17 can completely surround the groove 1200, or partially surround the groove 1200. In some embodiments, the first weld mark 17 can be at least partially circular or square.

[0156] In the above solution, by setting the first weld mark 17 to surround the groove 1200, the connection area between the adapter 14 and the electrode terminal 12 can be increased, the connection stability between the adapter 14 and the electrode terminal 12 can be improved, the risk of electrical connection failure can be reduced, and the battery has higher reliability.

[0157] In some other embodiments, the first weld mark 17 may include a plurality of sub-weld marks, and the plurality of sub-weld marks are spaced apart and arranged around the groove 1200 .

[0158] According to some embodiments of the present application, please refer to FIG8 , which is a schematic diagram of the internal structure of the first wall 110 , the electrode terminal 12 , and the adapter 14 in some embodiments of the present application.

[0159] Along the thickness direction z of the first wall, the electrode terminal 12 is provided with a flange portion 121 at one end thereof facing the electrode assembly 13. The flange portion 121 is pressed against the inner side surface of the first wall 110 and is disposed around the groove 1200. The adapter 14 is welded to the flange portion 121 to form a first weld mark 17.

[0160] The flange portion 121 is located on the end of the electrode terminal 12 facing the electrode terminal 12. In some embodiments, the first wall 110 may include a mounting hole 1100. The electrode terminal 12 may include the flange portion 121 and a main body. The flange portion 121 may be connected to the main body and pressed against the inner side of the first wall 110. The flange portion 121 may function to limit displacement of the electrode terminal 12 along the thickness direction z of the first wall. In some embodiments, the adapter 14 and the flange portion 121 are welded to form a first weld mark 17.

[0161] Part of the body portion may be located in the mounting hole 1100, and another part of the body portion may be located on a side of the first wall 110 away from the electrode assembly 13 and connected to the current collecting member. In the battery, the battery cells 10 may be electrically connected via the current collecting member.

[0162] “The flange portion 121 is disposed around the groove 1200” can be understood as the groove 1200 being located in the middle of the flange portion 121. In some embodiments, the groove 1200 can be coaxially disposed with the mounting hole 1100 of the first wall 110.

[0163] In some embodiments, the electrode terminal 12 can be riveted to the first wall 110. The electrode terminal 12 can include a first portion, a second portion, and a third portion. The first portion, the second portion, and the third portion are sequentially connected along the thickness direction z of the first wall. The first portion is located on the outside of the first wall 110 and pressed against the outer side surface of the first wall 110. The second portion is located within the mounting hole 1100. The third portion is located on the inner side of the first wall 110. During the riveting process, the rivet head can move from the inner side surface of the first wall 110 toward the outer side surface, pressing against the end surface of the third portion facing the electrode assembly 13, thereby forming a flange portion 121 that is pressed against the inner side surface of the first wall 110 and simultaneously forming a groove 1200. In this case, the groove 1200 is located on the inner surface of the electrode terminal 12.

[0164] In some other embodiments, the electrode terminal 12 can be riveted to the first wall 110, but during the riveting process, the rivet head can press against the end face of the first part from the outer side face of the first wall 110 toward the inner side face to form a groove 1200 on the end face of the first part. At this time, the groove 1200 is on the outer surface of the electrode terminal 12.

[0165] Compared with the above two embodiments, that is, compared with the case where the groove 1200 is on the outer surface of the electrode terminal 12, since the groove 1200 is on the inner surface of the electrode terminal 12, the outer surface of the electrode terminal 12 has a larger area to connect with the busbar component, so that the connection relationship between the battery cell 10 and the busbar component is relatively stable, and the battery has higher reliability.

[0166] In the above solution, by providing a flange portion 121 at one end of the electrode terminal 12 facing the electrode assembly 13, the connection stability between the electrode terminal 12 and the first wall 110 can be improved, and the risk of the electrode terminal 12 detaching from the first wall 110 can be reduced, so that the battery has higher reliability.

[0167] According to other embodiments of the present application, please refer to Figure 9, which is a schematic diagram of the internal structure of the first wall 110, the electrode terminal 12, and the adapter 14 in other embodiments of the present application. The electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 that are separately provided and interconnected. The flange portion 121 and the groove 1200 are provided on the first terminal portion 122. The first terminal portion 122 and the second terminal portion 123 are configured to cooperate and clamp the first wall 110 to prevent the electrode terminal 12 from detaching from the first wall 110 along the thickness direction z of the first wall.

[0168] The phrase "the electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 that are separately disposed and interconnected" can be understood as meaning that the electrode terminal 12 includes two independent parts, one of which is the first terminal portion 122 and the other is the second terminal portion 123. Before the electrode terminal 12 is mounted on the first wall 110, the first terminal portion 122 and the second terminal portion 123 can be independent of each other and not connected to each other. When the electrode terminal 12 is mounted on the first wall 110, the first terminal portion 122 and the second terminal portion 123 are disposed corresponding to the mounting hole 1100 of the first wall 110. For example, at least one of the first terminal portion 122 and the second terminal portion 123 extends into the mounting hole 1100 to enable the first terminal portion 122 and the second terminal portion 123 to be connected to each other, and the first terminal portion 122 and the second terminal portion 123 are respectively pressed against the outer side and the inner side of the first wall 110.

[0169] For example, referring to FIG9 , a portion of the first terminal portion 122 is located on the inner side of the first wall 110. The portion of the first terminal portion 122 located on the inner side of the first wall 110 can be pressed against the inner side surface of the first wall 110. The other portion of the first terminal portion 122 is located within the mounting hole 1100. A portion of the second terminal portion 123 is located on the outer side of the first wall 110. The portion located on the outer side of the first wall 110 can be pressed against the outer side surface of the first wall 110. The other end of the second terminal portion 123 is located within the mounting hole 1100. The portion of the first terminal portion 122 located within the mounting hole 1100 can be connected to the portion of the second terminal portion 123 located within the mounting hole 1100. In some embodiments, "another portion of the first terminal portion 122 is located in the mounting hole 1100" can be interpreted as, for the purpose of lightweight, the first terminal portion 122 has a portion protruding into the mounting hole 1100 (the functions of the portion protruding into the mounting hole 1100 include positioning in the mounting hole 1100 and connecting with the second terminal portion 123). For this purpose, corresponding to the portion protruding into the mounting hole 1100, the first terminal portion 122 is formed with a recessed portion 144, which can be a groove 1200.

[0170] The connection between the first terminal portion 122 and the second terminal portion 123 includes, but is not limited to, bonding, welding, clamping, riveting, or screw connection, etc. The first terminal portion 122 is pressed tightly against the inner side surface of the first wall 110 including the flange portion 121 .

[0171] In the above scheme, by setting the electrode terminal 12 to include a first terminal portion 122 and a second terminal portion 123 that are separately set and interconnected, on the one hand, the difficulty of installing the electrode terminal 12 on the first wall 110 can be effectively reduced, thereby improving the manufacturing efficiency of the battery; on the other hand, compared with the scheme of riveting to the first wall 110, by setting the first terminal portion 122 and the second terminal portion 123 separately and connecting them to each other, the connection strength between the electrode terminal 12 and the first wall 110 can be improved, thereby reducing the risk of the electrode terminal 12 being detached from the first wall 110, thereby making the battery have higher reliability.

[0172] According to some embodiments of the present application, referring to FIG. 4 to FIG. 7 , the positioning portion 15 includes a positioning protrusion 150 protruding from the first surface 120 .

[0173] In some embodiments, the positioning portion 15 may include a positioning protrusion 150 disposed on the first surface 120, which is used to constrain the adapter 14 to position the adapter 14. For example, the wall surface of the positioning protrusion 150 can constrain the wall surface of the adapter 14 to achieve positioning of the adapter 14. In other embodiments, the positioning portion 15 may include a positioning protrusion 150 disposed on the first surface 120, and the adapter 14 may be correspondingly provided with a recessed groove, so that the positioning portion 15 and the adapter 14 are positioned together through the concave-convex structure.

[0174] In the above solution, by providing a positioning protrusion 150 on the first surface 120, the adapter 14 can be effectively positioned so that the adapter 14 and the electrode terminal 12 can be welded in the correct posture, reducing the risk of the first weld mark 17 falling into the groove 1200 to cause a cold weld, thereby reducing the risk of the electrical connection between the adapter 14 and the electrode terminal 12 failing due to a cold weld, resulting in an internal short circuit in the battery cell 10, and making the battery have higher reliability.

[0175] According to some embodiments of the present application, referring to FIG. 4 to FIG. 7 , along the thickness direction z of the first wall, the positioning portion 15 does not overlap with the groove 1200 .

[0176] 4 to 7 , the positioning portion 15 may be disposed around the groove 1200 . For example, the positioning portion 15 may be disposed on the flange portion 121 and surround the first surface 120 .

[0177] In the above solution, by setting the positioning portion 15 so as not to overlap with the groove 1200, that is, the positioning portion 15 is set outside the groove 1200, the adapter 14 can be effectively positioned so that the adapter 14 and the electrode terminal 12 are welded in the correct posture, reducing the risk of the first weld mark 17 falling into the groove 1200 to cause a cold weld, thereby reducing the risk of the electrical connection between the adapter 14 and the electrode terminal 12 failing due to a cold weld, resulting in an internal circuit break in the battery cell 10, and making the battery have higher reliability.

[0178] According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the positioning portion 15 includes a groove 1200 , and a protrusion 143 is formed on the side of the adapter 14 facing the electrode terminal 12 , and the protrusion 143 is positioned and matched with the groove 1200 .

[0179] “Positioning portion 15 includes groove 1200 ” can be understood as groove 1200 being used to position adapter 14 . When groove 1200 is used to position adapter 14 , a convex portion 143 is correspondingly formed on the side of adapter 14 facing electrode terminal 12 , and convex portion 143 can be positioned in groove 1200 .

[0180] In some embodiments, the protrusion 143 may be a bump provided on the surface of the adapter 14. In other embodiments, the protrusion 143 may be a component that is stamped from the side of the adapter 14 facing away from the electrode terminal 12 so as to protrude from the side of the adapter 14 facing the electrode terminal 12.

[0181] In the above scheme, by limiting the positioning portion 15 to include the groove 1200, the groove 1200 can be reasonably utilized, so that the adapter 14 and the electrode terminal 12 are positioned and matched with each other through the concave-convex structure, which can effectively improve the positioning accuracy between the adapter 14 and the electrode terminal 12, and reduce the interference of the groove 1200 on the first weld mark 17, thereby effectively reducing the risk of electrical connection failure between the adapter 14 and the electrode terminal 12 due to cold welding, so that the battery has higher reliability.

[0182] According to some embodiments of the present application, please refer to Figures 8 to 10. Figure 10 is a schematic diagram of the local structure of the battery cell 10 in some embodiments of the present application.

[0183] A recessed portion 144 is formed on a side of the adapter 14 facing away from the electrode terminal 12 . The recessed portion 144 is disposed corresponding to the raised portion 143 .

[0184] The recessed portion 144 is a recessed structure formed on a surface of the adapter 14 away from the electrode terminal 12 .

[0185] In the above solution, by forming the recessed portion 144 on the side of the adapter 14 away from the electrode terminal 12 , the mass of the adapter 14 can be effectively reduced, thereby improving the mass energy density of the battery.

[0186] According to some embodiments of the present application, referring to FIG9 , the electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 which are separately arranged, and the first terminal portion 122 and the second terminal portion 123 are arranged and connected along the thickness direction z of the first wall, and at least a portion of the first terminal portion 122 is located on a side of the first wall 110 facing the electrode assembly 13, and at least a portion of the second terminal portion 123 is located on a side of the first wall 110 away from the electrode assembly 13, and the first terminal portion 122 and the second terminal portion 123 are configured to cooperate with each other to clamp the first wall 110 so as to limit the electrode terminal 12 from detaching from the first wall 110 along the thickness direction z of the first wall.

[0187] "The electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 that are separately provided" can be understood as meaning that the electrode terminal 12 includes two independent parts, one of which is the first terminal portion 122 and the other is the second terminal portion 123. Before the electrode terminal 12 is assembled to the first wall 110, the first terminal portion 122 and the second terminal portion 123 can be independent of each other and not connected to each other. When the electrode terminal 12 is assembled to the first wall 110, the first terminal portion 122 and the second terminal portion 123 are arranged corresponding to the mounting hole 1100 of the first wall 110 and are stacked along the thickness direction z of the first wall. For example, at least one of the first terminal portion 122 and the second terminal portion 123 extends into the mounting hole 1100 so that the first terminal portion 122 and the second terminal portion 123 can be connected to each other, and the first terminal portion 122 and the second terminal portion 123 are respectively pressed against the outer side surface and the inner side surface of the first wall 110.

[0188] For example, referring to FIG9 , a portion of the first terminal portion 122 is located on the inner side of the first wall 110, and the portion of the first terminal portion 122 located on the inner side of the first wall 110 can be pressed against the inner side surface of the first wall 110, while the other portion of the first terminal portion 122 is located within the mounting hole 1100. A portion of the second terminal portion 123 is located on the outer side of the first wall 110, and the portion located on the outer side of the first wall 110 can be pressed against the outer side surface of the first wall 110, while the other end of the second terminal portion 123 is located within the mounting hole 1100.

[0189] In other embodiments, the first terminal portion 122 may be plate-shaped, with two opposing surfaces thereof in the thickness direction z of the first wall being flat. A portion of the second terminal portion 123 may be pressed against the outer side surface of the first wall 110, while another portion of the second terminal portion 123 is located within the mounting hole 1100 and is connectable to the first terminal portion 122.

[0190] The connection between the first terminal portion 122 and the second terminal portion 123 includes, but is not limited to, welding, bonding, clamping, riveting, or screw connection. In some embodiments, the first terminal portion 122 and the second terminal portion 123 can be welded to each other to form a second weld mark. In some embodiments, the second weld mark and the first weld mark 17 do not overlap. For example, the portion of the first terminal portion 122 located within the mounting hole 1100 can be welded to the portion of the second terminal portion 123 located within the mounting hole 1100 to form the second weld mark.

[0191] Currently, the electrode terminal 12 can be assembled to the first wall 110 through a riveting process. For example, during the riveting process, the rivet head can press against the end surface of the electrode terminal 12 away from the electrode assembly 13 from the outer side surface of the first wall 110 toward the inner side surface, thereby forming a flange portion 121 that is pressed tightly against the outer side surface of the first wall 110. However, due to the limitations of the riveting process, the area of ​​the flange portion 121 is small, resulting in a weak connection between the electrode terminal 12 and the first wall 110. The electrode terminal 12 is easily separated from the first wall 110, affecting the reliability of the battery.

[0192] To this end, in the above scheme, the electrode terminal 12 is configured to include a first terminal portion 122 and a second terminal portion 123 that are separately arranged and interconnected, so that the electrode terminal 12 can be designed with a larger area and can be pressed tightly against the first wall 110, so as to improve the connection strength between the electrode terminal 12 and the first wall 110, reduce the risk of the electrode terminal 12 being detached from the first wall 110, and make the battery have higher reliability.

[0193] According to some embodiments of the present application, along the second direction y, the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap, and the second direction y is any direction perpendicular to the thickness direction z of the first wall.

[0194] “Along the second direction y, the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap” can be understood as that the first terminal portion 122 and the second terminal portion 123 are stacked in the thickness direction z of the first wall, and the contact surface between the two can be a flat surface, so that in any direction perpendicular to the thickness direction z of the first wall, the projection of the first terminal portion 122 and the projection of the second terminal portion 123 do not overlap.

[0195] In the above solution, by setting the projection of the first terminal portion 122 and the projection of the second terminal portion 123 to be non-overlapping, the difficulty of assembling the first terminal portion 122 and the second terminal portion 123 on the first wall 110 can be reduced, thereby improving the manufacturing efficiency of the battery cell and thus improving the manufacturing efficiency of the battery.

[0196] According to some embodiments of the present application, the first terminal portion 122 is provided with a positioning portion 15 .

[0197] 9 , in some embodiments, the positioning portion 15 can be disposed on a surface of the first terminal portion 122 facing away from the first wall 110. The positioning portion 15 can include a groove 1200 disposed on the first terminal portion 122. In other embodiments, the positioning portion 15 can further include a positioning protrusion 150 disposed on the first terminal portion 122.

[0198] In some embodiments, to facilitate assembly between the first terminal portion 122 and the second terminal portion 123, the second terminal portion 123 may be formed with a positioning flange that protrudes into the mounting hole 1100 of the first wall 110. Based on these embodiments, the second terminal portion 123 may be formed with a recessed area corresponding to the position of the positioning flange, and the recessed area may be used as the groove 1200 for positioning.

[0199] In the above solution, by providing the positioning portion 15 on the first terminal portion 122, the adapter 14 and the electrode terminal 12 can be welded in the correct posture, thereby reducing the risk of internal short circuit of the battery cell due to failure of the electrical connection between the adapter 14 and the electrode terminal 12 caused by cold welding, thereby making the battery have higher reliability.

[0200] Some embodiments of the present application further provide a battery, which includes the battery cell 10 provided above.

[0201] Some embodiments of the present application further provide an electrical device, which includes the battery cell 10 provided above. The battery cell 10 is used to provide electrical energy.

[0202] The present application also provides a battery cell 10, please refer to Figures 3 to 10. The battery cell 10 includes a shell 11, an electrode assembly 13, an electrode terminal 12 and an adapter 14. The shell 11 has a first wall 110. The electrode terminal 12 is installed on the first wall 110. The electrode assembly 13 is arranged inside the shell 11. The adapter 14 connects the electrode terminal 12 and the electrode assembly 13. Among them, the electrode terminal 12 is provided with a positioning portion 15 for positioning the adapter 14. The electrode terminal 12 has a first surface 120 facing the motor assembly, and the positioning portion 15 can be provided on the first surface 120, and the first surface 120 is formed with a groove 1200. The electrode terminal 12 and the adapter 14 are welded and connected to form a first weld mark 17.

[0203] In some embodiments, as shown in FIG4 , the positioning portion 15 includes a positioning protrusion 150 disposed on the first surface 120, and the adapter 14 is correspondingly provided with a positioning groove 160. The positioning protrusion 150 and the positioning groove 160 cooperate with each other to position the adapter 14, thereby reducing the risk of the first weld mark 17 overlapping with the groove 1200 during welding, thereby stabilizing the electrical connection between the electrode terminal 12 and the adapter 14 and improving the reliability of the battery cell 10.

[0204] In some embodiments, as shown in Figures 5-7 , the positioning portion 15 includes a positioning protrusion 150 disposed on the first surface 120. The positioning protrusion 150 protrudes from the first surface 120, and the positioning protrusion 150 and the first surface 120 together define a positioning space 151. The terminal connection portion 140 of the adapter 14 is positioned in the positioning space 151, which can reduce the risk of overlap between the first weld mark 17 and the groove 1200 during welding, thereby stabilizing the electrical connection between the electrode terminal 12 and the adapter 14, and thereby enhancing the reliability of the battery cell 10.

[0205] In some embodiments, referring to Figures 8-10 , the positioning portion 15 includes a groove 1200. A protrusion 143 is formed on the side of the adapter 14 facing the electrode terminal 12. The protrusion 143 is positioned and engaged with the groove 1200. The positioning and engagement of the groove 1200 and the protrusion 143 can reduce the risk of the first weld mark 17 overlapping with the groove 1200 during welding, thereby stabilizing the electrical connection between the electrode terminal 12 and the adapter 14 and improving the reliability of the battery cell 10.

[0206] In some embodiments, the electrode terminal 12 includes a first terminal portion 122 and a second terminal portion 123 that are separately arranged. The first terminal portion 122 and the second terminal portion 123 are arranged and connected along the thickness direction z of the first wall. At least a portion of the first terminal portion 122 is located on the side of the first wall 110 facing the electrode assembly 13, and at least a portion of the second terminal portion 123 is located on the side of the first wall 110 facing away from the electrode assembly 13. The first terminal portion 122 and the second terminal portion 123 are configured to cooperate and clamp the first wall 110 to limit the electrode terminal 12 from separating from the first wall 110 along the thickness direction z of the first wall. The positioning portion 15 can be provided on the first terminal portion 122.

[0207] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: a housing having a first wall; an electrode terminal mounted on the first wall; An electrode assembly is disposed inside the housing; A transition piece, connecting the electrode terminal and the electrode assembly; Wherein, the electrode terminal is provided with a positioning portion for positioning the adapter.

2. The battery cell according to claim 1, wherein: The adapter is provided with a positioning matching portion, and the positioning matching portion cooperates with the positioning portion.

3. The battery cell according to claim 2, wherein: One of the positioning portion and the positioning matching portion includes a positioning groove, and the other includes a positioning protrusion.

4. The battery cell according to claim 3, wherein: There are multiple positioning parts and multiple positioning matching parts, the multiple positioning parts are arranged at intervals, and the multiple positioning matching parts correspond to the multiple positioning parts one by one.

5. The battery cell according to claim 1, wherein: Along the thickness direction of the first wall, the electrode terminal has a first surface facing the electrode assembly; The positioning portion includes a positioning protrusion, the positioning protrusion protrudes from the first surface, and the positioning protrusion and the first surface together define a positioning space. The adapter includes a terminal connecting portion connected to the electrode terminal, and the terminal connecting portion is positioned in the positioning space.

6. The battery cell according to claim 5, wherein: Along the circumference of the first surface, the positioning protrusion is arranged around the edge of the first surface, and a notch is formed on the positioning protrusion, and the notch is used to avoid the adapter.

7. The battery cell according to claim 6, wherein: The positioning protrusion extends along the circumference of the first surface and surrounds the edge portion of the first surface; along the circumference of the first surface, two ends of the positioning protrusion are spaced apart to form the notch.

8. The battery cell according to claim 6, wherein: The positioning protrusion includes a plurality of sub-positioning protrusions, and the plurality of sub-positioning protrusions are arranged at intervals along the circumference of the first surface, and the gap is formed between two of the plurality of sub-positioning protrusions.

9. The battery cell according to any one of claims 5 to 8, wherein: The adapter also includes a tab connection portion for connecting to the tab of the electrode assembly, the terminal connection portion and the tab connection portion are connected to each other, and the width of the tab connection portion is greater than the width of the terminal connection portion.

10. The battery cell according to any one of claims 1 to 9, wherein: Along the thickness direction of the first wall, the electrode terminal has a first surface facing the electrode assembly, and the first surface is formed with a groove; The adapter and the electrode terminal are welded to form a first weld mark, and along the thickness direction of the first wall, the first weld mark does not overlap with the groove.

11. The battery cell according to claim 10, wherein: The first weld mark is arranged around the groove.

12. The battery cell according to claim 10 or 11, wherein: Along the thickness direction of the first wall, one end of the electrode terminal facing the electrode assembly is provided with a flange portion, the flange portion is pressed tightly against the inner side surface of the first wall, and the flange portion is provided around the groove; The adapter and the flange portion are welded to form the first weld mark.

13. The battery cell according to claim 12, wherein: The electrode terminal includes a first terminal portion and a second terminal portion that are separately arranged and interconnected, the flange portion and the groove are arranged on the first terminal portion, and the first terminal portion and the second terminal portion are configured to cooperate to clamp the first wall to limit the electrode terminal from detaching from the first wall along the thickness direction of the first wall.

14. The battery cell according to any one of claims 10 to 13, wherein: The positioning portion includes a positioning protrusion protruding from the first surface.

15. The battery cell according to any one of claims 10 to 14, wherein: Along a thickness direction of the first wall, the positioning portion does not overlap with the groove.

16. The battery cell according to any one of claims 10 to 14, wherein: The positioning portion includes the groove, and a convex portion is formed on a side of the adapter facing the electrode terminal, and the convex portion is positioned and matched with the groove.

17. The battery cell according to claim 16, wherein: A concave portion is formed on a side of the adapter away from the electrode terminal, and the concave portion is arranged corresponding to the convex portion.

18. The battery cell according to any one of claims 1 to 9, wherein: The electrode terminal includes a first terminal portion and a second terminal portion which are separately arranged, the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the first wall, at least a portion of the first terminal portion is located on a side of the first wall facing the electrode assembly, and at least a portion of the second terminal portion is located on a side of the first wall away from the electrode assembly, and the first terminal portion and the second terminal portion are configured to cooperate to clamp the first wall to limit the electrode terminal from detaching from the first wall along the thickness direction of the first wall.

19. The battery cell according to claim 18, wherein: Along a second direction, a projection of the first terminal portion and a projection of the second terminal portion do not overlap, and the second direction is an arbitrary direction perpendicular to the thickness direction of the first wall.

20. The battery cell according to claim 18 or 19, wherein: The first terminal portion is provided with the positioning portion.

21. A battery, wherein: A battery cell comprising the battery cell according to any one of claims 1 to 20.

22. An electrical device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 20, wherein the battery cell is used to provide electrical energy.

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