Battery unit, battery and electric device

Abstract

Disclosed in the present application are a battery unit, a battery and an electric device. The battery unit comprises a shell, an electrode terminal, an electrode assembly and an adapter assembly. The shell comprises a first side plate and a second side plate, which are arranged adjacent to each other. The electrode terminal comprises a first terminal post and a second terminal post, which are separately mounted on the first side plate. The electrode assembly is arranged inside the shell, and comprises a battery cell main body, at least one first tab and at least one second tab, wherein the first tab and the second tab protrude from the side of the battery cell main body facing the second side plate. The adapter assembly comprises a first adapter and a second adapter, wherein the first adapter and the second adapter both extend, from the side of the battery cell main body facing the first side plate, to the side of the battery cell main body facing the second side plate; the first adapter is connected to the first terminal post and the first tab; and the second adapter is connected to the second terminal post and the second tab. The battery unit provided in the present application can improve the space utilization rate, thereby improving the energy density of the battery unit.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420422769.1, filed on March 5, 2024, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a battery, and an electrical device. Background Art

[0004] With the development of new energy technologies, batteries are becoming increasingly widely used. For example, batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0005] The development of battery technology requires consideration of multiple design factors, including reliability, cycle life, and processing technology. Furthermore, the battery's energy density must be considered. Improving battery energy density is a key research topic in the battery field. Summary of the Invention

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device to improve the energy density of the battery.

[0007] According to the first aspect of the present application, the present application provides a battery cell, which includes: a shell, including a first side plate and a second side plate arranged adjacent to each other; an electrode terminal, including a first pole and a second pole, the first pole and the second pole are separately installed on the first side plate; an electrode assembly, arranged in the shell, the electrode assembly includes a battery body, at least one first pole lug and at least one second pole lug, the polarity of the first pole lug and the second pole lug are opposite, and the first pole lug and the second pole lug extend from the side of the battery body facing the second side plate; and an adapter assembly, including a first adapter and a second adapter, each of the first adapter and the second adapter extends from the side of the battery body facing the first side plate to the side of the battery body facing the second side plate, the first adapter is connected to the first pole and the at least one first pole lug, and the second adapter is connected to the second pole and the at least one second pole lug.

[0008] In the embodiment of the present application, by providing a first adapter and a second adapter, the first pole and the second pole can be arranged on the same side of the shell, and the first pole tab and the second pole tab can extend from the same side of the battery cell body. Since the first pole and the second pole are arranged on the same side of the shell, it is only necessary to reserve space on the same side of the shell exterior to accommodate the first pole and the second pole at the same time. In addition, the first pole tab and the second pole tab extend from the same side of the battery cell body, and it is only necessary to reserve a certain space between the second side plate of the shell and the battery cell body to arrange the first pole tab and the second pole tab at the same time, thereby reducing the space required for arranging the pole tabs and poles, improving the space utilization of the battery cell, and thus improving the energy density of the battery cell.

[0009] Optionally, the first adapter and the second adapter both include a first section and a second section, the first section and the second section are bent and connected, the first section is arranged on the side of the battery cell body facing the first side plate, and the second section is arranged on the side of the battery cell body facing the second side plate.

[0010] In the embodiment of the present application, the first adapter and the second adapter are arranged into two sections, and the two sections are respectively arranged on both sides of the battery cell body facing the first side plate and the second side plate. This not only facilitates the connection between the adapter and the pole, and the adapter and the pole ear, but also shortens the extension path of the adapter, reduces the volume of the adapter, and further reduces the space occupied by the adapter.

[0011] Optionally, the first adapter and the second adapter are spaced apart along the first direction, and the first side plate and the second side plate are both parallel to the first direction. Thus, the first adapter and the second adapter do not intersect, minimizing interference or overlap between the positive and negative electrodes and improving the reliability of the battery cell.

[0012] Optionally, the width of the first adapter along the first direction is consistent, and the width of the first adapter along the first direction and the thickness of the battery cell body along the first direction satisfy: 0<d1<0.5d0, wherein d1 represents the width of the first adapter along the first direction, and d0 represents the thickness of the battery cell body along the first direction.

[0013] In the embodiment of the present application, the width of the first adapter along the first direction is set to be less than half of the thickness of the battery cell body along the first direction, so that space can be reserved in the first direction for the arrangement of the second adapter. When the first adapter and the second adapter are simultaneously arranged on the side of the battery cell body facing the first side plate and the side facing the second side plate, the first adapter and the second adapter can be spaced apart along the first direction.

[0014] Optionally, the width of the second adapter along the first direction is consistent, and the width of the second adapter along the first direction and the thickness of the battery cell body along the first direction satisfy: 0<d2<0.5d0, where d2 represents the width of the second adapter along the first direction, and d0 represents the thickness of the battery cell body along the first direction.

[0015] In the embodiment of the present application, the width of the second adapter along the first direction is set to be less than half of the thickness of the battery cell body along the first direction, so that space can be reserved for the setting of the first adapter in the first direction. When the first adapter and the second adapter are simultaneously arranged on the side of the battery cell body facing the first side plate and the side facing the second side plate, the first adapter and the second adapter can be spaced apart along the first direction.

[0016] Optionally, at least one first tab and at least one second tab are spaced apart along the second direction, the second section extends along the second direction, the first tab is connected to the second section of the first adapter, and the second tab is connected to the second section of the second adapter. Thus, the second section of the first adapter and the second section of the second adapter both have a long extension length in the second direction, facilitating connection with the at least one first tab and the at least one second tab spaced apart along the second direction, resulting in a more reasonable structural design.

[0017] Optionally, there are multiple first pole tabs and multiple second pole tabs; the multiple first pole tabs and the multiple second pole tabs are alternately distributed along the second direction.

[0018] In the embodiment of the present application, the number of both the first and second tabs is set to multiple, which can significantly reduce current resistance, improve the uniformity of current density distribution, and enhance the fast charging performance of the battery. The multiple first tabs and the multiple second tabs are alternately distributed along the second direction, which can make the distribution of the first tabs along the second direction more uniform, and the distribution of the second tabs along the second direction more uniform, thereby further improving the uniformity of current density distribution.

[0019] Optionally, at least one first pole lug and at least one second pole lug are arranged at intervals along the second direction, and the second direction is perpendicular to the first side plate; the first adapter and the second adapter both include a main body and a connecting portion, the connecting portion protrudes and extends from the main body along the first direction, the first direction intersects with the second direction, the first pole lug is connected to the connecting portion of the first adapter, and the second pole lug is connected to the connecting portion of the second adapter.

[0020] In the embodiment of the present application, by respectively providing connecting portions protruding from the main body along the first direction on the first adapter and the second adapter, the size of only the connecting portion can be set to be larger, and the size of the main body can be set to be smaller. On the premise that the first adapter and the second adapter do not come into contact, the area of ​​the connecting portions of the first adapter and the second adapter for connecting to the pole tab is increased, which is equivalent to increasing the connectable area between the adapter and the pole tab, reducing the difficulty of connection between the adapter and the pole tab, improving the manufacturability of the battery cell, and making the battery cell have a stronger current-carrying capacity.

[0021] Optionally, the protruding directions of the connecting portion of the first adapter and the connecting portion of the second adapter are arranged in opposite directions, and the connecting portions of the first adapter and the second adapter are spaced apart along the second direction. This allows the first and second bodies to be adjacent to opposite sides of the battery cell body along the first direction, thereby increasing the spacing between the first and second bodies. Furthermore, contact between the connecting portions of the first and second adapters can be avoided, and the connecting portions of the first and second adapters can be as large as possible in the first direction, further increasing the connectable area between the adapter and the tab.

[0022] Optionally, the first adapter and the second adapter further include a connecting portion that protrudes and extends from the main body in the first direction, the first pole being connected to the connecting portion of the first adapter, and the second pole being connected to the connecting portion of the second adapter. Thus, the size of the connecting portion can be appropriately increased, and while the first and second adapters do not come into contact, the connectable area between the first and second adapters and the poles is increased, reducing the difficulty of connecting the adapters and the poles, improving the manufacturability of the battery cell, and providing the battery cell with a stronger current carrying capacity.

[0023] Optionally, a first insulating layer is provided on a side of the first adapter facing the battery cell body and a side facing the second adapter, and a second insulating layer is provided on a side of the second adapter facing the battery cell body and a side facing the first adapter.

[0024] By providing the first insulating layer and the second insulating layer, the embodiment of the present application can avoid interference or overlap between the positive and negative electrodes during the connection between the lead tab and the adapter, thereby avoiding short circuits and improving the reliability of the battery cell.

[0025] Optionally, the adapter assembly includes an insulating plate, which is disposed on the side of the first adapter and the second adapter facing the battery cell body and extends from the side of the first adapter facing away from the second adapter to the side of the second adapter facing away from the first adapter. The insulating plate not only provides insulation isolation between the first adapter and the second tab, and between the second adapter and the first tab, thereby resolving the problem of interference or overlap between the positive and negative electrodes, but also pre-fixes the relative positions of the first adapter and the second adapter, thereby improving the structural stability of the first and second adapters.

[0026] Optionally, the first and second side plates are both parallel to the first direction; the dimension of the second side plate along the second direction is greater than the dimension of the first side plate along the third direction, and the first, second, and third directions are perpendicular to each other. Thus, the first and second tabs both extend from the long sides of the battery cell body, facilitating the enlargement of the first and second tabs, thereby optimizing the uniformity of current sealing distribution within the battery cell.

[0027] According to a second aspect of the present application, the present application further provides a battery, which includes the battery cell provided by any embodiment.

[0028] According to the second aspect of the present application, the present application further provides an electrical device, which includes the battery provided in any embodiment, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0031] FIG2 is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application.

[0032] FIG3 is a schematic structural diagram of the assembled electrode assembly and adapter assembly of the battery cell shown in FIG2 .

[0033] FIG4 is a schematic cross-sectional view of FIG3 taken along one direction.

[0034] FIG5 is a schematic cross-sectional view of FIG3 taken along another direction.

[0035] FIG6 is a schematic structural diagram of an assembled electrode assembly and a switching assembly of a battery cell provided in another embodiment of the present application.

[0036] FIG7 is a schematic cross-sectional view of a first adapter and a second adapter of a battery cell provided in one embodiment of the present application.

[0037] FIG8 is a schematic cross-sectional view of a first adapter and a second adapter of a battery cell provided in another embodiment of the present application.

[0038] FIG9 is a schematic structural diagram of a battery provided in one embodiment of the present application. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0042] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, m and / or n can represent: m exists alone, m and n exist simultaneously, and n exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0044] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0045] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.

[0046] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0047] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-90°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

[0048] For electrode assemblies with a large length-to-width ratio, the use of long-side lead-out tabs can appropriately increase the number of tabs, so that the current in the bare electrode assembly flows out through multiple tabs separately, with less resistance, and the distribution of multiple tabs can make the current density distribution in the collector more uniform, so as to enhance the fast charging performance of the battery. Existing long-side lead-out tabs include two situations: leading out the positive and negative pole tabs separately from the long sides on both sides, and leading out the positive and negative pole tabs at the same time from the long sides on the same side. If the positive and negative pole tabs are led out separately from the long sides on both sides, the poles of the battery cell can be arranged on the same side or on different sides. If the pole tabs are led out simultaneously from the long sides on the same side, the poles of the battery cell are arranged on different sides.

[0049] When tabs are led out along different long sides, or when poles are arranged on different sides, more space is required to arrange the corresponding mechanical components, or more space is reserved, which reduces the battery's energy density to a certain extent. In other words, in existing battery cells, while the use of tabs led out along the long side of the electrode assembly can optimize the battery's density distribution, it cannot effectively balance the battery's space utilization, resulting in a loss of battery energy density.

[0050] Based on the above considerations, in order to solve the problem of battery energy density loss caused by extending the tabs from the long side of the electrode assembly, the inventors have designed a battery cell after in-depth research. By arranging the first adapter and the second adapter in the shell of the battery cell, and extending the first adapter and the second adapter from the side of the battery cell body facing the first side plate of the shell to the side of the battery cell body facing the second side plate of the shell, the first pole and the second pole can be allowed to be arranged on the same side of the shell, and at the same time, the first tab and the second tab can be extended from the same side of the battery cell body.

[0051] In such a battery cell, since the first and second terminals are located on the same side of the housing, only space needs to be reserved on the same side of the housing exterior to accommodate both terminals. Furthermore, since the first and second tabs extend from the same side of the battery cell body, only a certain amount of space needs to be reserved between the second side plate of the housing and the battery cell body to accommodate both the first and second tabs. This reduces the space required for arranging the tabs and terminals, improves the space utilization of the battery cell, and thus increases the energy density of the battery cell.

[0052] Against the background of increasing demand for battery energy density, the battery cells of the present application can achieve the arrangement of the battery cell tabs on the same long side of the electrode assembly and the arrangement of the battery cell poles on the same side of the shell by setting a special adapter, while taking into account the uniformity of the battery density distribution and the energy density of the battery.

[0053] The present application also provides a battery comprising a battery cell. The battery cell and battery provided by the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery disclosed herein can be used to enhance battery reliability.

[0054] 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. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0056] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0057] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0058] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0059] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0060] The present application also provides an electrical device using a battery as a power source. The electrical 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.

[0061] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0062] Figure 1 is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. Referring to Figure 1, the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0063] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Figure 2 is a schematic diagram of the exploded structure of a battery cell provided by an embodiment of the present application. Referring to Figure 2, the battery cell 1 provided by the embodiment of the present application includes a shell 10, an electrode terminal 20, an electrode assembly 30 and a adapter assembly 40. The shell 10 includes a first side plate 11 and a second side plate 12 arranged adjacent to each other. The electrode terminal 20 includes a first pole 21 and a second pole 22, and the first pole 21 and the second pole 22 are separately installed on the first side plate 11. The electrode assembly 30 is arranged in the shell 10, and the electrode assembly 30 includes a battery body 31, at least one first pole lug 32 and at least one second pole lug 33. The polarities of the first pole lug 32 and the second pole lug 33 are opposite, and the first pole lug 32 and the second pole lug 33 extend from the side of the battery body 31 facing the second side plate 12. Figure 3 is a schematic diagram of the structure of the electrode assembly 30 and the adapter assembly 40 of the battery cell shown in Figure 2 after assembly. 2 and 3 , the adapter assembly 40 includes a first adapter 41 and a second adapter 42 , both of which extend from the side of the cell body 31 facing the first side plate 11 to the side of the cell body 31 facing the second side plate 12 . The first adapter 41 is connected to the first pole 21 and at least one first pole lug 32 , and the second adapter 42 is connected to the second pole 22 and at least one second pole lug 33 .

[0065] The housing 10 may define a cavity for accommodating the electrode assembly 30, electrolyte, and other components. The housing 10 may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film.

[0066] The housing 10 may be in various shapes, for example, the housing 10 may be in a rectangular parallelepiped, a polygonal prism, a cylindrical shape, etc. The structural shape of the electrode assembly 30 may be adapted to the shape of the housing 10 .

[0067] The first side plate 11 and the second side plate 12 of the housing 10 are adjacently disposed, which means that the first side plate 11 and the second side plate 12 are adjacent to and connected to each other. The first side plate 11 and the second side plate 12 may be intersectingly connected.

[0068] Exemplarily, the first side panel 11 and the second side panel 12 are both substantially plate-shaped members. The first side panel 11 and the second side panel 12 are vertically connected. The housing 10 further includes four other side panels, one of which is a third side panel 13 that is vertically connected to the first side panel 11 and the second side panel 12. The other three side panels are respectively arranged parallel to the first side panel 11, the second side panel 12, and the third side panel 13.

[0069] The first pole 21 and the second pole 22 can be arranged at intervals along the direction of the larger dimension of the first side plate 11 to increase the distance between the first pole 21 and the second pole 22 as much as possible to avoid interference or overlap of the positive and negative poles.

[0070] The first pole 21 and the second pole 22 may pass through the first side plate 11 and be riveted to the first side plate 11. The first pole 21 and the second pole 22 are insulated from the first side plate 11.

[0071] The electrode assembly 30 is a component where an electrochemical reaction occurs in the battery cell 1. The battery cell 1 may include one or more electrode assemblies 30.

[0072] The battery cell 1 further includes an insulating member 50 wrapped around the electrode assembly 30 to separate the electrode assembly 30 from the housing 10. The insulating member 50 may be an insulating film.

[0073] The battery cell 1 also includes a blue film 60 wrapped around the outside of the shell 10 to achieve isolation and insulation between the battery cell 1 and external circuits, while also protecting the shell 10 and reducing the risk of the shell 10 being scratched.

[0074] The electrode assembly 30 may be a wound electrode assembly, a laminated electrode assembly, or another type of electrode assembly.

[0075] Figure 4 is a schematic cross-sectional view of Figure 3 taken along one direction, and Figure 5 is a schematic cross-sectional view of Figure 3 taken along another direction. Referring to Figures 4 and 5 , the electrode assembly 30 is primarily formed by winding or stacking a positive electrode 34 and a negative electrode 35 , with a separator 36 typically provided between the positive electrode 34 and the negative electrode 35 to insulate and isolate the positive electrode 34 and the negative electrode 35 to prevent short circuits between the positive and negative electrodes while also allowing active ions to pass through.

[0076] The positive electrode 34 may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector. The positive electrode current collector may be a metal foil or a composite current collector. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material may include at least one of the following materials: a lithium-containing phosphate, a lithium transition metal oxide, and modified compounds thereof. However, this application is not limited to these materials; other conventional materials that can be used as battery positive electrode active materials may also be used.

[0077] The negative electrode 35 may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. The negative electrode current collector may be a metal foil, metal foam, carbon foam, or a composite current collector. The negative electrode active material may be a negative electrode active material commonly known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys.

[0078] The separator may be an isolation membrane, and the main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0079] Illustratively, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0080] The portions of the positive electrode 34 and negative electrode 35 containing active material constitute the battery cell body 31, while the portions of the positive electrode 34 and negative electrode 35 without active material each constitute a tab. One of the first tab 32 and the second tab 33 is the positive tab, and the other is the negative tab. Accordingly, the pole connected to the positive tab via an adapter is the positive pole pole, forming the positive output pole of the battery cell 1; the pole connected to the negative tab via an adapter is the negative pole pole, forming the negative output pole of the battery cell 1. During the battery's charge and discharge processes, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit.

[0081] There may be one or more first tabs 32 , and the first adapter 41 is connected to each first tab 32 . There may be one or more second tabs 33 , and the second adapter 42 is connected to each second tab 33 .

[0082] The projection of the first electrode tab 32 in a plane parallel to the second side plate 12 does not overlap with the projection of the second electrode tab 33 in the same plane, so as to reduce the risk of interference between the positive and negative poles of the first electrode tab 32 and the second electrode tab 33 .

[0083] The first adapter 41 and the second adapter 42 both extend along the outer surface of the battery cell body 31. In addition, the first adapter 41 and the second adapter 42 are separately provided to reduce the interference problem between the positive and negative electrodes.

[0084] The first adapter 41 and the first pole 21 , the first adapter 41 and the first tab 32 , the second adapter 42 and the second pole 22 , and the second adapter 42 and the second tab 33 may be connected by welding or other appropriate means.

[0085] In the embodiment of the present application, by providing a first adapter 41 and a second adapter 42, the first pole 21 and the second pole 22 can be located on the same side of the housing 10, and the first pole tab 32 and the second pole tab 33 can extend from the same side of the battery cell body 31. Since the first pole 21 and the second pole 22 are located on the same side of the housing 10, only space needs to be reserved on the same side of the exterior of the housing 10 to accommodate the first pole 21 and the second pole 22, as well as related mechanical components. Furthermore, since the first pole tab 32 and the second pole tab 33 extend from the same side of the battery cell body 31, only a certain space needs to be reserved between the second side plate 12 of the housing 10 and the battery cell body 31 to simultaneously arrange the first pole tab 32 and the second pole tab 33. This reduces the space required for arranging the pole tabs and poles, improves the space utilization of the battery cell 1, and thereby increases the energy density of the battery cell 1.

[0086] In some embodiments, referring to Figures 2 and 3, the first adapter 41 and the second adapter 42 both include a first section and a second section, the first section and the second section are bent and connected, the first section is arranged on the side of the battery cell body 31 facing the first side plate 11, and the second section is arranged on the side of the battery cell body 31 facing the second side plate 12.

[0087] Specifically, the first adapter 41 and the second adapter 42 both have an L-shaped bending structure. The first adapter 41 includes a first section 411 and a second section 412, and the first section 411 and the second section 412 of the first adapter 41 are bent and connected. The second adapter 42 includes a first section 421 and a second section 422, and the first section 421 and the second section 422 of the second adapter 42 are bent and connected. The first section 411 of the first adapter 41 and the first section 421 of the second adapter 42 are both located on the side of the battery cell body 31 facing the first side plate 11, and the second section 412 of the first adapter 41 and the second section 422 of the second adapter 42 are both located on the side of the battery cell body 31 facing the second side plate 12.

[0088] The first pole 21 can be connected to the first section 411 of the first adapter 41, and the second pole 22 can be connected to the first section 421 of the second adapter 42. The first tab 32 can be connected to the second section 412 of the first adapter 41, and the second tab 33 can be connected to the second section 422 of the second adapter 42.

[0089] The first adapter 41 and the second adapter 42 may both be sheet-shaped components to minimize occupied space and improve the energy density of the battery cell 1 .

[0090] The first adapter 41 and the second adapter 42 are both attached to or extend adjacent to the outer surface of the battery cell body 31 to reduce the gap between them and the battery cell body 31 , thereby further improving the energy density of the battery cell 1 .

[0091] The first adapter 41 and the second adapter 42 are both used to connect the pole located on the first side plate 11 and the pole ear facing the second side plate 12. In the embodiment of the present application, the first adapter 41 and the second adapter 42 are both arranged into two sections, and the two sections are respectively arranged on both sides of the battery cell body 31 facing the first side plate 11 and the second side plate 12. This not only facilitates the connection between the adapter and the pole, and the adapter and the pole ear, but also shortens the extension path of the adapter, reduces the volume of the adapter, and further reduces the space occupied by the adapter.

[0092] In some embodiments, the first adapter 41 and the second adapter 42 are spaced apart along the first direction X, and the first side plate 11 and the second side plate 12 are parallel to the first direction X. Thus, the first adapter 41 and the second adapter 42 do not cross each other, thus minimizing interference or overlap between the positive and negative electrodes and improving the reliability of the battery cell 1.

[0093] The first direction X may be an extending direction of an edge formed by the intersection of the first side plate 11 and the second side plate 12 .

[0094] The side of the battery cell body 31 facing the first side plate 11 and the side facing the second side plate 12 are both parallel to the first direction X.

[0095] The housing 10 and the battery body 31 can both be rectangular parallelepiped structures. The housing 10 further includes a third side plate 13. The first side plate 11, the second side plate 12 and the third side plate 13 are vertically connected in pairs, and the third side plate 13 is perpendicular to the first direction X.

[0096] The first adapter 41 and the second adapter 42 can be respectively located adjacent to opposite sides of the cell body 31 along the first direction X, thereby increasing the spacing between the first adapter 41 and the second adapter 42. Accordingly, the first tab 32 can be located on a side of the cell body 31 adjacent to the first adapter 41 along the first direction X, thereby facilitating connection with the first adapter 41; and the second tab 33 can be located on a side of the cell body 31 adjacent to the second adapter 42 along the first direction X, thereby facilitating connection with the second adapter 42.

[0097] In some embodiments, the width of the first adapter 41 along the first direction X is consistent, and the width of the first adapter 41 along the first direction X and the thickness of the battery cell body 31 along the first direction X satisfy: 0<d1<0.5d0, where d1 represents the width of the first adapter 41 along the first direction X, d0 represents the thickness of the battery cell body 31 along the first direction X, and d2 represents the width of the second adapter 42 along the first direction X.

[0098] The first adapter 41 may be a bent long strip-shaped member. The first adapter 41 has a uniform width at all locations along its length.

[0099] The width of the first adapter 41 can be selected to enable reliable electrical connection with the pole and the tab. The width of the first adapter 41 can be flexibly adjusted according to the requirement of the flow capacity.

[0100] In the embodiment of the present application, the width of the first adapter 41 along the first direction X is set to be less than half of the thickness of the battery cell body 31 along the first direction X, so that space can be reserved for the arrangement of the second adapter 42 in the first direction X. When the first adapter 41 and the second adapter 42 are simultaneously arranged on the side of the battery cell body 31 facing the first side plate 11 and the side facing the second side plate 12, the first adapter 41 and the second adapter 42 can be separated along the first direction X.

[0101] In some embodiments, the width of the second adapter 42 along the first direction X is consistent, and the width of the second adapter 42 along the first direction X and the thickness of the battery cell body 31 along the first direction X satisfy: 0<d2<0.5d0, where d2 represents the width of the second adapter 42 along the first direction X, and d0 represents the thickness of the battery cell body 31 along the first direction X.

[0102] The second adapter 42 may be a bent long strip-shaped member, and the width of the second adapter 42 is uniform at all locations along its length.

[0103] The width of the second adapter 42 can be selected to enable reliable electrical connection with the pole and the tab. The width of the first adapter 41 can be flexibly adjusted according to the requirement of the current carrying capacity.

[0104] In the embodiment of the present application, the width of the second adapter 42 along the first direction X is set to be less than half of the thickness of the battery cell body 31 along the first direction X, so that space can be reserved for the arrangement of the first adapter 41 in the first direction X. When the first adapter 41 and the second adapter 42 are simultaneously arranged on the side of the battery cell body 31 facing the first side plate 11 and the side facing the second side plate 12, the first adapter 41 and the second adapter 42 can be separated along the first direction X.

[0105] In some embodiments, at least one first pole tab 32 and at least one second pole tab 33 are arranged at intervals along the second direction Y, the second section 412 of the first adapter 41 and the second section 422 of the second adapter 42 both extend along the second direction Y, the first pole tab 32 is connected to the second section 412 of the first adapter 41, and the second pole tab 33 is connected to the second section 422 of the second adapter 42.

[0106] At least one first electrode tab 32 and at least one second electrode tab 33 are arranged at intervals along the second direction Y, which reduces the possibility of interference or overlap between the first electrode tab 32 and the second electrode tab 33 .

[0107] The second section 412 of the first adapter 41 and the second section 422 of the second adapter 42 both have a longer extension length in the second direction Y, which is convenient for connecting with at least one first pole tab 32 and at least one second pole tab 33 arranged at intervals along the second direction Y, and the structural design is more reasonable.

[0108] In some embodiments, there are multiple first electrode tabs 32 and multiple second electrode tabs 33 , and the multiple first electrode tabs 32 and the multiple second electrode tabs 33 are alternately distributed along the second direction Y.

[0109] The number of the first electrode tabs 32 and the second electrode tabs 33 can be flexibly set according to the size of the battery cell body 31 along the second direction Y, so as to ensure that the distance between any two adjacent electrode tabs is kept within a suitable range.

[0110] The number of the first electrode tabs 32 and the number of the second electrode tabs 33 may be the same or different.

[0111] In the embodiment of the present application, the number of first and second pole tabs 32 and 33 is set to multiple, which can greatly reduce the current resistance, improve the uniformity of current density distribution, and enhance the fast charging performance of the battery. The multiple first pole tabs 32 and the multiple second pole tabs 33 are alternately distributed along the second direction Y, which can make the distribution of the first pole tabs 32 and the distribution of the second pole tabs 33 along the second direction Y more uniform, thereby further improving the uniformity of current density distribution.

[0112] In some embodiments, the first side plate 11 and the second side plate 12 are parallel to the first direction X. The dimension of the second side plate 12 along the second direction Y is greater than the dimension of the first side plate 11 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0113] The first side plate 11 is parallel to a plane defined by the first direction X and the third direction Z. The second side plate 12 is parallel to a plane defined by the first direction X and the second direction Y. The first side plate 11 and the second side plate 12 have the same size along the first direction X.

[0114] The dimension of the second side plate 12 along the second direction Y is greater than the dimension of the first side plate 11 along the third direction Z. The second direction Y may be the length direction of the electrode assembly 30 , the third direction Z may be the width direction of the electrode assembly 30 , and the first direction X may be the thickness direction of the electrode assembly 30 .

[0115] In the embodiment of the present application, the first pole tab 32 and the second pole tab 33 are arranged on the side of the battery cell body 31 facing the second side plate 12, that is, the first pole tab 32 and the second pole tab 33 both extend from the long side direction of the battery cell body 31, which is conducive to expanding the first pole tab 32 and the second pole tab 33, thereby optimizing the current sealing distribution uniformity of the battery cell 1.

[0116] In some embodiments, the ratio of the dimension of the second side plate 12 along the second direction Y to the dimension of the first side plate 11 along the third direction Z is greater than 2. In other words, the battery cell 1 provided in the embodiments of the present application can have a larger aspect ratio, thereby facilitating the arrangement of more tabs, thereby making the advantages of the battery cell 1 in optimizing the uniformity of current density distribution and improving the battery energy density more obvious.

[0117] Figure 6 is a schematic diagram of the assembled structure of an electrode assembly 30 and adapter assembly 40 of a battery cell according to another embodiment of the present application. In some embodiments, at least one first electrode tab 32 and at least one second electrode tab 33 are arranged in a spaced relationship along a second direction Y, which is perpendicular to the first side plate 11. The second side plate 12 can be parallel to the plane defined by the first direction X and the second direction Y.

[0118] Furthermore, each of the first adapter 41 and the second adapter 42 includes a main body and a connecting portion, the connecting portion extending protruding from the main body along a first direction X, where the first direction X intersects with the second direction Y. Specifically, the first adapter 41 includes a first main body 413 and a first connecting portion 414, the first connecting portion 414 extending protruding from the first main body 413 along the first direction X. The second adapter 42 includes a second main body 423 and a second connecting portion 424, the second connecting portion 424 extending protruding from the second main body 423 along the first direction X. The first tab 32 is connected to the first connecting portion 414 of the first adapter 41, and the second tab 33 is connected to the second connecting portion 424 of the second adapter 42.

[0119] The size of the first body 413 along the second direction Y may be smaller than the size of the first connection portion 414 along the second direction Y. Similarly, the size of the second body 423 along the second direction Y may be smaller than the size of the second connection portion 424 along the second direction Y.

[0120] In the embodiment of the present application, by respectively providing connecting portions protruding from the main body along the first direction X on the first adapter 41 and the second adapter 42, the size of only the connecting portion can be set to be larger, and the size of the main body can be set to be smaller. On the premise that the first adapter 41 and the second adapter 42 do not come into contact with each other, the area of ​​the connecting portion of the first adapter 41 and the second adapter 42 for connecting to the pole tab is increased, which is equivalent to increasing the connectable area between the adapter and the pole tab, reducing the difficulty of connecting between the adapter and the pole tab, improving the manufacturability of the battery cell 1, and making the battery cell 1 have a stronger current-carrying capacity.

[0121] In some embodiments, the protruding directions of the first connection portion 414 of the first adapter 41 and the second connection portion 424 of the second adapter 42 are arranged to face each other, and the first connection portion 414 and the second connection portion 424 are spaced apart along the second direction Y.

[0122] The first connecting portion 414 and the second connecting portion 424 protrude in opposite directions, allowing the first body 413 and the second body 423 to be adjacent to opposite sides of the battery cell body 31 along the first direction X, thereby increasing the distance between the first body 413 and the second body 423. In this case, the first connecting portion 414 can protrude toward the second adapter 42, and the second connecting portion 424 can protrude toward the first adapter 41.

[0123] The first connection portion 414 and the second connection portion 424 are spaced apart along the second direction Y, which can avoid contact between the connection portions of the first adapter 41 and the second adapter 42, and make the connection portions of the first adapter 41 and the second adapter 42 have as large a size as possible in the first direction X, further increasing the connectable area between the adapter and the tab.

[0124] When there are multiple first electrode tabs 32 and multiple second electrode tabs 33, there are also multiple first connecting portions 414 and multiple second connecting portions 424. The multiple first connecting portions 414 are connected to the multiple first electrode tabs 32 in a one-to-one correspondence, and the multiple second connecting portions 424 are connected to the multiple second electrode tabs 33 in a one-to-one correspondence. The first connecting portions 414 and the second connecting portions 424 protrude in the same direction.

[0125] The first connection portions 414 and the second connection portions 424 are alternately and spaced apart along the second direction Y. The second connection portions 424 can be located in the gap between two adjacent first connection portions 414 , and the first connection portions 414 can be located in the gap between two adjacent second connection portions 424 , thereby fully utilizing the space between the battery cell body 31 and the second side plate 12 and further increasing the connectable area between the adapter and the tab as much as possible.

[0126] In some embodiments, the first adapter 41 and the second adapter 42 further include an adapter portion, which protrudes from the main body along the first direction X. Specifically, the first adapter 41 includes a first adapter portion 415 protruding from its first main body 413 along the first direction X, and the second adapter 42 includes a second adapter portion 425 protruding from its second main body 423 along the first direction X.

[0127] Furthermore, the protruding directions of the first adapter portion 415 and the second adapter portion 425 are arranged to face each other. The first pole 21 is connected to the first adapter portion 415 , and the second pole 22 is connected to the second adapter portion 425 .

[0128] The first transition portion 415 may protrude toward the second transition component 42 , and the second transition portion 425 may protrude toward the first transition component 41 .

[0129] The first transition portion 415 and the first connection portion 414 protrude in the same direction, and the second transition portion 425 and the second connection portion 424 protrude in the same direction.

[0130] In the embodiment of the present application, by respectively providing a transition portion protruding from the main body along the first direction X on the first transition member 41 and the second transition member 42, the size of the transition portion can be appropriately increased. On the premise that the first transition member 41 and the second transition member 42 do not come into contact, the connectable area between the first transition member 41 and the second transition member 42 and the pole is increased, the difficulty of connecting the transition member and the pole is reduced, the manufacturability of the battery cell 1 is improved, and the battery cell 1 has a stronger current-carrying capacity.

[0131] Optionally, the shapes of the first connecting portion 414 , the second connecting portion 424 , the first transition portion 415 and the second transition portion 425 may be square, circular, elliptical, semicircular or other suitable shapes.

[0132] The first adapter 41 having the first connection portion 414 and / or the first adapter portion 415 may be a sawtooth adapter piece structure. The second adapter 42 having the second connection portion 424 and / or the second adapter portion 425 may be a sawtooth adapter piece structure.

[0133] FIG7 is a schematic cross-sectional view of the first adapter and the second adapter of a battery cell according to one embodiment of the present application. Referring to FIG7 , the side of the first adapter 41 facing the cell body 31 and the side facing the second adapter 42 intersect at a first prism 417. The side of the second adapter 42 facing the cell body 31 and the side facing the first adapter 41 intersect at a second prism 427. When the first tab 32 extends from the cell body 31, it easily contacts the second prism 427 of the second adapter 42, resulting in a positive and negative overlap. When the second tab 33 extends from the cell body 31, it easily contacts the first prism 417 of the first adapter 41, resulting in a positive and negative overlap.

[0134] To this end, in some embodiments, referring to Figure 7, a first insulating layer 416 is provided on the side of the first adapter 41 facing the battery cell body 31 and on the side facing the second adapter 42, and a second insulating layer 426 is provided on the side of the second adapter 42 facing the battery cell body 31 and on the side facing the first adapter 41.

[0135] The first tab 32 may be connected to a side surface of the first adapter 41 facing away from the battery cell body 31 , and the second tab 33 may be connected to a side surface of the second adapter 42 facing away from the battery cell body 31 .

[0136] The first insulating layer 416 may cover the first prism 417 and at least a portion of the side of the first adapter 41 facing the cell body 31 and the side facing the second adapter 42 , thereby effectively insulating and isolating the first adapter 41 from the second tab 33 .

[0137] The second insulating layer 426 may cover the second prism 427 and at least a portion of the side surface of the second adapter 42 facing the cell body 31 and the side surface facing the first adapter 41 , thereby effectively insulating and isolating the second adapter 42 from the first tab 32 .

[0138] In the embodiment of the present application, by providing the first insulating layer 416 and the second insulating layer 426 , interference or overlap between the positive and negative electrodes can be avoided during the connection between the lead tab and the adapter, thereby avoiding a short circuit and improving the reliability of the battery cell 1 .

[0139] Figure 8 is a schematic cross-sectional view of the first and second adapters of a battery cell according to another embodiment of the present application. In other embodiments, referring to Figure 8 , the adapter assembly 40 further includes an insulating plate 43 . The insulating plate 43 is disposed on the side of the first adapter 41 and the second adapter 42 facing the battery cell body 31 , and extends from the side of the first adapter 41 facing away from the second adapter 42 to the side of the second adapter 42 facing away from the first adapter 41 .

[0140] The insulating plate 43 has a continuous plate structure, and covers at least the gap between the first adapter 41 and the second adapter 42 , the area of ​​the first adapter 41 adjacent to the gap along the first direction X, and the area of ​​the second adapter 42 adjacent to the gap along the first direction X.

[0141] Optionally, the dimension of insulating plate 43 along first direction X may be equivalent to the vertical distance from the side of first adapter 41 facing away from second adapter 42 to the side of second adapter 42 facing away from first adapter 41. In this case, insulating plate 43 covers the gap between first adapter 41 and second adapter 42, as well as the entire side surfaces of first adapter 41 and second adapter 42 facing battery cell body 31.

[0142] The first adapter 41 and the second adapter 42 can be connected to the insulating plate 43. The connection between the first adapter 41 and the insulating plate 43, and between the second adapter 42 and the insulating plate 43, can be achieved by bonding, welding, riveting or other suitable methods.

[0143] During assembly, the first adapter 41 and the second adapter 42 can be first connected to the insulating plate 43, and then the assembly formed by the first adapter 41, the second adapter 42 and the insulating plate 43 can be assembled and connected to the electrode assembly 30. The insulating plate 43 not only can achieve insulation isolation between the first adapter 41 and the second electrode tab 33, and between the second adapter 42 and the first electrode tab 32, thereby solving the problem of interference or overlap between the positive and negative electrodes, but also can pre-fix the relative positions of the first adapter 41 and the second adapter 42, thereby improving the structural stability of the first adapter 41 and the second adapter 42.

[0144] According to the second aspect of the present application, an embodiment of the present application further provides a battery 100. Figure 9 is a schematic structural diagram of a battery provided by an embodiment of the present application. The battery 100 provided by the embodiment of the present application may include the battery cell 1 provided by any of the above embodiments.

[0145] In the battery 100, there can be one or more battery cells 1. When there are multiple battery cells 1, the multiple battery cells 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the case of the battery 100. Of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 1 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the case of the battery 100. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 1.

[0146] According to a third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes the battery 100 provided in any of the above embodiments, and the battery 100 is used to provide electrical energy.

[0147] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0148] In some embodiments, the present application provides a battery cell 1, which includes a shell 10, an electrode terminal 20, an electrode assembly 30 and an adapter assembly 40. The electrode terminal 20 includes a first pole 21 and a second pole 22 mounted on the first side plate 11 of the shell. The electrode assembly 30 includes a battery body 31, at least one first pole tab 32 and at least one second pole tab 33, and the first pole tab 32 and the second pole tab 33 both extend from the side of the battery body 31 facing the second side plate 12 of the shell. The first adapter 41 and the second adapter 42 of the adapter assembly 40 both extend from the side of the battery body 31 facing the first side plate 11 to the side of the battery body 31 facing the second side plate 12, so as to respectively connect the first pole 21 and the first pole tab 32, and the second pole 22 and the second pole tab 33. Both the first adapter 41 and the second adapter 42 have a serrated structure. Specifically, the first adapter 41 may include a first body 413 and a first connecting portion 414 protruding from the first body 413 along the first direction X. The second adapter 42 may include a second body 423 and a second connecting portion 424 protruding from the second body 423 along the first direction X. The first connecting portion 414 and the second connecting portion 424 are relatively large, increasing the area available for connection between the first adapter 41 and the first tab 32, as well as the area available for connection between the second adapter 42 and the second tab 33. The first and second connecting portions 414 and 424 protrude in opposite directions and are alternately spaced along the second direction Y to maximize their areas within a limited space. An insulating layer is applied to both the sides of the first and second adapters 41 and 42 facing the cell body 31, as well as the sides of the first and second adapters 41 and 42 facing each other. An insulating plate 43 may also be provided on the side of the first adapter 41 and the second adapter 42 facing the battery cell body 31 .

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, comprising: The housing comprises a first side plate and a second side plate disposed adjacent to each other; An electrode terminal, comprising a first pole and a second pole, wherein the first pole and the second pole are separately mounted on the first side plate; an electrode assembly disposed in the housing, the electrode assembly comprising a battery cell body, at least one first electrode tab, and at least one second electrode tab, wherein the first electrode tab and the second electrode tab have opposite polarities and extend from a side of the battery cell body facing the second side plate; and The adapter assembly includes a first adapter and a second adapter, each of which extends from the side of the battery cell body facing the first side plate to the side of the battery cell body facing the second side plate. The first adapter is connected to the first pole and the at least one first pole lug, and the second adapter is connected to the second pole and the at least one second pole lug.

2. The battery cell according to claim 1, wherein: The first adapter and the second adapter both include a first section and a second section, the first section and the second section are bent and connected, the first section is arranged on the side of the battery cell body facing the first side plate, and the second section is arranged on the side of the battery cell body facing the second side plate.

3. The battery cell according to claim 2, wherein: The first transition member and the second transition member are spaced apart along a first direction, and the first side plate and the second side plate are both parallel to the first direction.

4. The battery cell according to claim 3, wherein: The width of the first adapter along the first direction is consistent, and the width of the first adapter along the first direction and the thickness of the battery cell body along the first direction meet the following conditions: 0<d1<0.5d0, Wherein, d1 represents the width of the first adapter along the first direction, and d0 represents the thickness of the battery cell body along the first direction.

5. The battery cell according to claim 3 or 4, wherein: The width of the second adapter along the first direction is consistent, and the width of the second adapter along the first direction and the thickness of the battery cell body along the first direction meet the following conditions: 0<d2<0.5d0, Wherein, d2 represents the width of the second adapter along the first direction, and d0 represents the thickness of the battery cell body along the first direction.

6. The battery cell according to any one of claims 2 to 5, wherein: The at least one first tab and the at least one second tab are spaced apart along the second direction, the second section extends along the second direction, the first tab is connected to the second section of the first adapter, and the second tab is connected to the second section of the second adapter.

7. The battery cell according to claim 6, wherein: The number of the first electrode tab and the number of the second electrode tab are both multiple; The plurality of first electrode tabs and the plurality of second electrode tabs are alternately distributed along the second direction.

8. The battery cell according to any one of claims 1 to 5, wherein: The at least one first electrode tab and the at least one second electrode tab are arranged at intervals along a second direction, and the second direction is perpendicular to the first side plate; The first adapter and the second adapter both include a main body and a connecting portion, the connecting portion protruding and extending from the main body along a first direction, the first direction intersecting with the second direction, the first tab connected to the connecting portion of the first adapter, and the second tab connected to the connecting portion of the second adapter.

9. The battery cell according to claim 8, wherein: The protruding directions of the connecting portion of the first adapter and the connecting portion of the second adapter are arranged to face each other, and the connecting portion of the first adapter and the connecting portion of the second adapter are spaced apart along the second direction.

10. The battery cell according to claim 8 or 9, wherein: The first adapter and the second adapter further include an adapter portion, which protrudes and extends from the main body along the first direction. The first pole is connected to the adapter portion of the first adapter, and the second pole is connected to the adapter portion of the second adapter.

11. The battery cell according to any one of claims 1 to 10, wherein: A first insulating layer is provided on a side of the first adapter facing the battery cell body and a side facing the second adapter, and a second insulating layer is provided on a side of the second adapter facing the battery cell body and a side facing the first adapter.

12. The battery cell according to any one of claims 1 to 10, wherein: The adapter assembly includes an insulating plate, which is arranged on the side of the first adapter and the second adapter facing the battery cell body and extends from the side of the first adapter facing away from the second adapter to the side of the second adapter facing away from the first adapter.

13. The battery cell according to any one of claims 1 to 12, wherein: The first side panel and the second side panel are both parallel to the first direction; A dimension of the second side plate along the second direction is greater than a dimension of the first side plate along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

14. A battery comprising the battery cell according to any one of claims 1 to 13.

15. An electrical device comprising the battery according to claim 14, wherein the battery is used to provide electrical energy.

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