Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and a switching assembly, the shell comprises a first side plate and a second side plate which are adjacently arranged. The electrode terminal includes a first pole and a second pole separately mounted to the first side plate. The electrode assembly is arranged in the shell and comprises a battery cell main body, at least one first tab and at least one second tab, and the first tab and the second tab extend out of one side, facing the second side plate, of the battery cell main body. The switching assembly comprises a first switching piece and a second switching piece, the first switching piece and the second switching piece extend from the side, facing the first side plate, of the battery cell main body to the side, facing the second side plate, of the battery cell main body, the first switching piece is connected to the first pole and the first tab, and the second switching piece is connected to the second pole and the second tab. According to the battery monomer provided by the invention, the space utilization rate can be improved, so that the energy density of the battery monomer is improved.

Description

Technical Field

[0001] 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

[0002] With the development of new energy technology, the application of batteries is becoming more and more extensive. For example, batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0003] The development of battery technology must consider many design factors at the same time, such as battery reliability, cycle life, processing technology, etc., and the energy density of the battery must also be considered. How to improve the energy density of the battery is an important research direction in the battery field. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device to improve the energy density of the battery.

[0005] 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 cell body, at least one first pole ear and at least one second pole ear, the polarities of the first pole ear and the second pole ear are opposite, and the first pole ear and the second pole ear extend from a side of the battery cell body facing the second side plate; and an adapter assembly, including a first adapter and a second adapter separately arranged, the first adapter and the second adapter both extend from a side of the battery cell body facing the first side plate to a 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 ear, and the second adapter is connected to the second pole and the at least one second pole ear.

[0006] The embodiment of the present application arranges the first adapter and the second adapter so that the first pole and the second pole can be arranged on the same side of the shell, and the first pole lug and the second pole lug 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 outside to accommodate the first pole and the second pole at the same time. In addition, the first pole lug and the second pole lug 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 lug and the second pole lug at the same time, thereby reducing the space required for arranging the pole lugs and poles, improving the space utilization of the battery cell, and thus improving the energy density of the battery cell.

[0007] 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 a side of the battery cell body facing the first side plate, and the second section is arranged on a side of the battery cell body facing the second side plate.

[0008] 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 between 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.

[0009] Optionally, the first adapter and the second adapter are arranged at intervals along the first direction, and the first side plate and the second side plate are parallel to the first direction. Thus, the first adapter and the second adapter will not cross each other, and interference or overlap between the positive and negative electrodes is avoided as much as possible, thereby improving the reliability of the battery cell.

[0010] 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.

[0011] In the embodiment of the present application, the width of the first adapter along the first direction is set to be smaller 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.

[0012] 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, 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.

[0013] In the embodiment of the present application, the width of the second adapter along the first direction is set to be smaller 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 first 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, at least one first pole lug and at least one second pole lug are arranged at intervals along the second direction, the second section extends along the second direction, the first pole lug is connected to the second section of the first adapter, and the second pole lug 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 longer extension length in the second direction, which is convenient for connection with at least one first pole lug and at least one second pole lug arranged at intervals along the second direction, and the structural design is more reasonable.

[0015] 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.

[0016] In the embodiment of the present application, the number of the first pole lug and the second pole lug are both 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. Multiple first pole lugs and multiple second pole lugs are alternately distributed along the second direction, which can make the distribution of the first pole lug along the second direction more uniform, and make the distribution of the second pole lug along the second direction more uniform, thereby further improving the uniformity of current density distribution.

[0017] Optionally, at least one first pole ear and at least one second pole ear 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 protrudes and extends from the main body along the first direction, the first direction intersects with the second direction, the first pole ear is connected to the connecting portion of the first adapter, and the second pole ear is connected to the connecting portion of the second adapter.

[0018] In the embodiment of the present application, by respectively providing connecting parts protruding from the main body along the first direction on the first adapter and the second adapter, only the size of the connecting part 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 with each other, the area of ​​the connecting parts of the first adapter and the second adapter for connecting with the pole lug is increased, which is equivalent to increasing the connectable area between the adapter and the pole lug, reducing the difficulty of connecting between the adapter and the pole lug, improving the manufacturability of the battery cell, and making the battery cell have a stronger current carrying capacity.

[0019] Optionally, the protruding directions of the connecting portion of the first adapter and the connecting portion of the second adapter are arranged facing 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. Thus, the first body and the second body can be respectively adjacent to the two sides of the battery cell body opposite to each other along the first direction, thereby increasing the distance between the first body and the second body. Furthermore, the contact between the connecting portions of the first adapter and the second adapter can be avoided, and the connecting portions of the first adapter and the second adapter can have as large a size as possible in the first direction, thereby further increasing the connectable area between the adapter and the tab.

[0020] Optionally, the first adapter and the second adapter further include an adapter portion, the adapter portion 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. Thus, the size of the adapter portion can be appropriately increased, and the connectable area between the first adapter and the second adapter and the pole is increased under the premise that the first adapter and the second adapter do not come into contact, thereby reducing the difficulty of connecting the adapter and the pole, improving the manufacturability of the battery cell, and making the battery cell have a stronger current carrying capacity.

[0021] 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.

[0022] The embodiment of the present application provides a first insulating layer and a second insulating layer, so as to avoid interference or overlap between the positive and negative electrodes during the connection between the lead-out tab and the adapter, thereby avoiding a short circuit and improving the reliability of the battery cell.

[0023] 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 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 can not only achieve insulation isolation between the first adapter and the second pole lug, and between the second adapter and the first pole lug, solving the problem of interference or overlap between the positive and negative poles, but also can fix the relative positions of the first adapter and the second adapter in advance, thereby improving the structural stability of the first adapter and the second adapter.

[0024] Optionally, the first side plate and the second side plate are 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 direction, the second direction and the third direction are perpendicular to each other. Thus, the first pole ear and the second pole ear both extend from the long side direction of the battery body, which is conducive to enlarging the first pole ear and the second pole ear, thereby optimizing the current sealing distribution uniformity of the battery cell.

[0025] According to a second aspect of the present application, the present application also provides a battery, which includes the battery cell provided by any embodiment.

[0026] According to the second aspect of the present application, the present application also provides an electrical device, which includes a battery provided in any embodiment, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0029] Figure 2 It is a schematic diagram of the exploded structure of a battery cell provided in one embodiment of the present application.

[0030] Figure 3 yes Figure 2 A schematic diagram of the structure of the battery cell after the electrode assembly and the adapter assembly are assembled.

[0031] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure taken along one of the directions.

[0032] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure taken along another direction.

[0033] Figure 6 It is a schematic diagram of the structure of the assembled electrode assembly and adapter assembly of a battery cell provided in another embodiment of the present application.

[0034] Figure 7 It is a schematic diagram of the cross-sectional structure of a first adapter and a second adapter of a battery cell provided in one embodiment of the present application.

[0035] Figure 8 It is a schematic cross-sectional structure diagram of a first adapter and a second adapter of a battery cell provided in another embodiment of the present application.

[0036] Fig. 9 It is a schematic diagram of the structure of a battery provided in one embodiment of the present application. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, m and / or n can represent: m exists alone, m and n exist at the same time, and n exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0043] 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 referred device or element 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.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0046] 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: the positive and negative pole tabs are led out of the long sides on both sides, and the positive and negative pole tabs are led out of the long sides on the same side at the same time. If the positive and negative pole tabs are led out of 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 of the long sides on the same side at the same time, the poles of the battery cell are arranged on different sides.

[0047] In the case of different long side lead-out tabs and poles arranged on different sides, more space is needed to arrange the corresponding mechanical components, or more space is reserved, which reduces the energy density of the battery to a certain extent. That is, in the existing battery cells, the long side lead-out tabs of the electrode assembly can optimize the density distribution of the battery, but it cannot take into account the space utilization of the battery well, resulting in a loss of battery energy density.

[0048] Based on the above considerations, in order to solve the problem of battery energy density loss caused by using the long side of the electrode assembly to lead out the pole ear, the inventor has 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 the first pole ear and the second pole ear can extend from the same side of the battery cell body.

[0049] In such a battery cell, since the first pole and the second pole are arranged on the same side of the shell, only space needs to be reserved 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 only a certain space needs to be reserved 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, which reduces the space required for arranging the pole tab and the pole, improves the space utilization of the battery cell, and further improves the energy density of the battery cell.

[0050] Against the background of increasing demand for battery energy density, the battery cells of the present application can, by providing a special adapter, arrange the pole ears of the battery cells on the same long side of the electrode assembly and arrange the poles of the battery cells on the same side of the shell, while taking into account the uniformity of the battery density distribution and the energy density of the battery.

[0051] The present application also provides a battery, which includes a battery cell. The battery cell and battery provided in the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The power supply system of the electrical device can be composed of the battery disclosed in the present application, which is conducive to improving the reliability of the battery.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0053] 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.

[0054] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0055] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0056] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0057] As an example, the battery cell may 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 particular limitation in the present application.

[0058] The present application also provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] 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.

[0060] Figure 1 A schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. Figure 1 The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. 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. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating 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, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0061] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0062] Figure 2 Schematic diagram of the exploded structure of a battery cell provided by an embodiment of the present application. Figure 2The battery cell 1 provided in the embodiment of the present application includes a shell 10, an electrode terminal 20, an electrode assembly 30 and a switching 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 ear 32 and at least one second pole ear 33, the polarities of the first pole ear 32 and the second pole ear 33 are opposite, and the first pole ear 32 and the second pole ear 33 extend from the side of the battery body 31 facing the second side plate 12. Figure 3 yes Figure 2 The schematic diagram of the structure of the electrode assembly 30 and the adapter assembly 40 of the battery cell after assembly. Figure 2 and Figure 3 The adapter assembly 40 includes a first adapter 41 and a second adapter 42, both of which extend from the side of the battery cell body 31 facing the first side plate 11 to the side of the battery 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 ear 32, and the second adapter 42 is connected to the second pole 22 and at least one second pole ear 33.

[0063] The housing 10 may define a housing cavity for accommodating the electrode assembly 30, electrolyte and other components. The housing 10 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film.

[0064] The housing 10 may be in various shapes, for example, the housing 10 may be in a rectangular parallelepiped shape, a polygonal prism shape, a cylindrical shape, etc. The structural shape of the electrode assembly 30 may be adapted to the shape of the housing 10 .

[0065] The first side plate 11 and the second side plate 12 of the housing 10 are disposed adjacent to each other, 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.

[0066] Exemplarily, the first side plate 11 and the second side plate 12 are both substantially plate-shaped members. The first side plate 11 and the second side plate 12 are vertically connected. The housing 10 further includes four other side plates, one of which is a third side plate 13 vertically connected to the first side plate 11 and the second side plate 12, and the other three side plates are respectively arranged parallel to the first side plate 11, the second side plate 12 and the third side plate 13.

[0067] The first pole 21 and the second pole 22 may be arranged at intervals along the direction of the first side plate 11 where the size is larger, so as to increase the distance between the first pole 21 and the second pole 22 as much as possible to avoid interference or overlap between the positive and negative poles.

[0068] 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.

[0069] 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.

[0070] The battery cell 1 further includes an insulating member 50 wrapped around the outside of the electrode assembly 30 to separate the electrode assembly 30 from the case 10. The insulating member 50 may be an insulating film.

[0071] 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, and at the same time can also protect the shell 10 and reduce the risk of the shell 10 being scratched.

[0072] The electrode assembly 30 may be a wound electrode assembly, a laminated electrode assembly, or other types of electrode assemblies.

[0073] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure taken along one direction. Figure 5 yes Figure 3 A schematic diagram of the cross-section structure taken from another direction. Figure 4 and Figure 5 The electrode assembly 30 is mainly formed by winding or stacking a positive electrode 34 and a negative electrode 35, and an isolation member 36 is usually 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 a short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0074] 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 their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0075] 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, a foamed metal, a foamed carbon or a composite current collector. The negative electrode active material may be a negative electrode active material for a battery cell known in the art. 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 compounds, silicon-nitrogen compounds, and silicon alloys.

[0076] The isolating element may be an isolating membrane, and the main material of the isolating membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0077] Exemplarily, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0078] The parts of the positive electrode 34 and the negative electrode 35 with active materials constitute the battery body 31, and the parts of the positive electrode 34 and the negative electrode 35 without active materials each constitute a pole ear. One of the first pole ear 32 and the second pole ear 33 is a positive pole ear, and the other is a negative pole ear. Correspondingly, the pole connected to the positive pole ear through the adapter is the positive pole pole, forming the positive output pole of the battery cell 1; the pole connected to the negative pole ear through the adapter is the negative pole pole, forming the negative output pole of the battery cell 1. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0079] The number of the first pole tabs 32 may be one or more, and the first adapter 41 is connected to each first pole tab 32. The number of the second pole tabs 33 may be one or more, and the second adapter 42 is connected to each second pole tab 33.

[0080] The projection of the first pole tab 32 in a plane parallel to the second side plate 12 does not overlap with the inner projection of the second pole tab 33 in the plane, so as to reduce the risk of interference between the positive and negative poles of the first pole tab 32 and the second pole tab 33 .

[0081] 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 arranged to reduce the interference problem between the positive and negative electrodes.

[0082] The first adapter 41 and the first pole 21 , the first adapter 41 and the first pole tab 32 , the second adapter 42 and the second pole 22 , and the second adapter 42 and the second pole tab 33 may be connected by welding or other suitable means.

[0083] In the embodiment of the present application, the first pole 21 and the second pole 22 are arranged on the same side of the housing 10 by providing the first adapter 41 and the second adapter 42, and the first pole lug 32 and the second pole lug 33 can be extended from the same side of the battery cell body 31. Since the first pole 21 and the second pole 22 are arranged on the same side of the housing 10, it is only necessary to reserve space on the same side outside the housing 10 to accommodate the first pole 21 and the second pole 22, as well as related mechanical structural parts. In addition, the first pole lug 32 and the second pole lug 33 extend from the same side of the battery cell body 31, and it is only necessary to reserve a certain space between the second side plate 12 of the housing 10 and the battery cell body 31 to arrange the first pole lug 32 and the second pole lug 33 at the same time, thereby reducing the space required for arranging the pole lugs and poles, improving the space utilization of the battery cell 1, and thus improving the energy density of the battery cell 1.

[0084] In some embodiments, reference Figure 2 and Figure 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.

[0085] 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 arranged 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 arranged on the side of the battery cell body 31 facing the second side plate 12.

[0086] 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.

[0087] The first adapter 41 and the second adapter 42 can both be sheet-like components to reduce the occupied space as much as possible and improve the energy density of the battery cell 1 .

[0088] 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 .

[0089] 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. The embodiment of the present application arranges the first adapter 41 and the second adapter 42 into two sections, and the two sections are respectively arranged on both sides of the battery 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.

[0090] In some embodiments, the first adapter 41 and the second adapter 42 are arranged at intervals along the first direction X, and the first side plate 11 and the second side plate 12 are parallel to the first direction X. Therefore, the first adapter 41 and the second adapter 42 will not cross each other, and interference or overlap between the positive and negative electrodes is avoided as much as possible, thereby improving the reliability of the battery cell 1.

[0091] 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 .

[0092] 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.

[0093] 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.

[0094] The first adapter 41 and the second adapter 42 may be respectively adjacent to two opposite sides of the cell body 31 along the first direction X, so as to increase the spacing distance between the first adapter 41 and the second adapter 42. Accordingly, the first pole tab 32 may be disposed on a side of the cell body 31 adjacent to the first adapter 41 along the first direction X, so as to facilitate connection with the first adapter 41; the second pole tab 33 may be disposed on a side of the cell body 31 adjacent to the second adapter 42 along the first direction X, so as to facilitate connection with the second adapter 42.

[0095] 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, wherein 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.

[0096] 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.

[0097] The width of the first adapter 41 can be selected to be able to reliably electrically connect with the pole and the lug. The width of the first adapter 41 can be flexibly adjusted according to the requirement of the current carrying capacity.

[0098] 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 spaced apart along the first direction X.

[0099] 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, wherein 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.

[0100] The second transition member 42 may be a bent long strip-shaped member. The width of the second transition member 42 along its length direction is consistent at all locations.

[0101] The width of the second adapter 42 can be selected to be able to reliably electrically connect with the pole and the lug. The width of the first adapter 41 can be flexibly adjusted according to the requirement of the current carrying capacity.

[0102] 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 spaced apart along the first direction X.

[0103] In some embodiments, at least one first pole lug 32 and at least one second pole lug 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 lug 32 is connected to the second section 412 of the first adapter 41, and the second pole lug 33 is connected to the second section 422 of the second adapter 42.

[0104] 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 .

[0105] The second section 412 of the first adapter 41 and the second section 422 of the second adapter 42 have a long extension length in the second direction Y, which is convenient for connecting with at least one first pole ear 32 and at least one second pole ear 33 arranged at intervals along the second direction Y, and the structural design is more reasonable.

[0106] 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.

[0107] The number of the first pole tabs 32 and the second pole tabs 33 can be flexibly set according to the size of the battery cell body 31 along the second direction Y to ensure that the distance between any two adjacent pole tabs is maintained within a suitable range.

[0108] The number of the first electrode tabs 32 and the number of the second electrode tabs 33 may be the same or different.

[0109] In the embodiment of the present application, the number of the first pole lug 32 and the second pole lug 33 are both set to multiple, which can greatly reduce the current resistance, improve the uniformity of the current density distribution, and enhance the fast charging performance of the battery. Multiple first pole lugs 32 and multiple second pole lugs 33 are alternately distributed along the second direction Y, which can make the distribution of the first pole lug 32 along the second direction Y more uniform, and make the distribution of the second pole lug 33 along the second direction Y more uniform, thereby further improving the uniformity of the current density distribution.

[0110] 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.

[0111] The first side plate 11 is parallel to a plane defined by the first direction X and the third direction Z, and 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.

[0112] The size of the second side plate 12 along the second direction Y is greater than the size 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 .

[0113] In the embodiment of the present application, the first pole ear 32 and the second pole ear 33 are arranged on the side of the battery cell body 31 facing the second side plate 12, that is, the first pole ear 32 and the second pole ear 33 both extend from the long side direction of the battery cell body 31, which is conducive to expanding the first pole ear 32 and the second pole ear 33, and further optimizing the current sealing distribution uniformity of the battery cell 1.

[0114] 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. That is, the battery cell 1 provided in the embodiment of the present application may have a larger aspect ratio, thereby facilitating the arrangement of more tabs, so that the advantages of the battery cell 1 in optimizing the uniformity of current density distribution and improving the battery energy density are more obvious.

[0115] Figure 6 1 is a schematic diagram of the structure of the electrode assembly 30 and the adapter assembly 40 of the battery cell provided by another embodiment of the present application after assembly. In some embodiments, at least one first pole lug 32 and at least one second pole lug 33 are arranged at intervals along the second direction Y, and the second direction Y is perpendicular to the first side plate 11. The second side plate 12 may be parallel to the plane defined by the first direction X and the second direction Y.

[0116] Further, the first adapter 41 and the second adapter 42 each include a main body and a connecting portion, the connecting portion protruding from the main body along a first direction X, and 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 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 protruding from the second main body 423 along the first direction X. The first pole tab 32 is connected to the first connecting portion 414 of the first adapter 41, and the second pole tab 33 is connected to the second connecting portion 424 of the second adapter 42.

[0117] 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.

[0118] In the embodiment of the present application, by respectively providing connecting parts 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 part 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 parts of the first adapter 41 and the second adapter 42 for connecting with the pole lug is increased, which is equivalent to increasing the connectable area between the adapter and the pole lug, reducing the difficulty of connecting between the adapter and the pole lug, improving the manufacturability of the battery cell 1, and making the battery cell 1 have a stronger current-carrying capacity.

[0119] 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.

[0120] The protruding directions of the first connection portion 414 and the second connection portion 424 are arranged to face each other, so that the first body 413 and the second body 423 can be respectively adjacent to the two 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. At this time, the first connection portion 414 can protrude toward the second adapter 42, and the second connection portion 424 can protrude toward the first adapter 41.

[0121] 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.

[0122] When there are multiple first pole tabs 32 and multiple second pole tabs 33, correspondingly, there are multiple first connection parts 414 and multiple second connection parts 424. Multiple first connection parts 414 are connected to multiple first pole tabs 32 in a one-to-one correspondence, and multiple second connection parts 424 are connected to multiple second pole tabs 33 in a one-to-one correspondence. The protruding directions of the first connection parts 414 are the same, and the protruding directions of the second connection parts 424 are the same.

[0123] The first connection parts 414 and the second connection parts 424 are alternately and spaced apart along the second direction Y. The second connection parts 424 can be located in the gap between two adjacent first connection parts 414, and the first connection parts 414 can be located in the gap between two adjacent second connection parts 424, which fully utilizes the space of the battery body 31 toward the second side plate 12, and further increases the connectable area between the adapter and the tab as much as possible.

[0124] 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.

[0125] 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 .

[0126] The first adapter portion 415 may protrude toward the second adapter 42 , and the second adapter portion 425 may protrude toward the first adapter 41 .

[0127] The first adapter portion 415 and the first connecting portion 414 protrude in the same direction, and the second adapter portion 425 and the second connecting portion 424 protrude in the same direction.

[0128] 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 with each other, the connectable area between the first transition member 41 and the second transition member 42 and the pole is increased, the connection difficulty between 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.

[0129] 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.

[0130] The first adapter 41 having the first connection portion 414 and / or the first adapter portion 415 may be a sawtooth adapter plate structure. The second adapter 42 having the second connection portion 424 and / or the second adapter portion 425 may be a sawtooth adapter plate structure.

[0131] Figure 7 is a schematic cross-sectional structure diagram of a first adapter and a second adapter of a battery cell provided in an embodiment of the present application, with reference to Figure 7, the side of the first adapter 41 facing the battery body 31 and the side facing the second adapter 42 intersect at the first prism 417. The side of the second adapter 42 facing the battery body 31 and the side facing the first adapter 41 intersect at the second prism 427. When the first pole tab 32 extends from the battery body 31, it is easy to contact the second prism 427 of the second adapter 42, resulting in positive and negative pole overlap; when the second pole tab 33 extends from the battery body 31, it is easy to contact the first prism 417 of the first adapter 41, resulting in positive and negative pole overlap.

[0132] To this end, in some embodiments, reference Figure 7 A first insulating layer 416 is provided on one side of the first adapter 41 facing the cell body 31 and on one side of the second adapter 42 , and a second insulating layer 426 is provided on one side of the second adapter 42 facing the cell body 31 and on one side of the first adapter 41 .

[0133] The first pole 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 pole tab 33 may be connected to a side surface of the second adapter 42 facing away from the battery cell body 31 .

[0134] The first insulating layer 416 may cover the first prism 417 and at least a portion of the side surface of the first adapter 41 facing the cell body 31 and the side surface of the second adapter 42 , thereby effectively insulating and isolating the first adapter 41 from the second electrode tab 33 .

[0135] 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 of the first adapter 41 , thereby effectively insulating and isolating the second adapter 42 from the first tab 32 .

[0136] 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-out tab and the adapter, thereby avoiding a short circuit and improving the reliability of the battery cell 1 .

[0137] Figure 8 is a schematic cross-sectional structure diagram of a first adapter and a second adapter of a battery cell provided in another embodiment of the present application. Figure 8 The adapter assembly 40 also includes an insulating plate 43, which is arranged 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 away from the second adapter 42 to the side of the second adapter 42 away from the first adapter 41.

[0138] 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.

[0139] Optionally, the size of the insulating plate 43 along the first direction X may be equivalent to the vertical distance 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. In this case, the insulating plate 43 covers the gap between the first adapter 41 and the second adapter 42, and the entire side of the first adapter 41 and the second adapter 42 facing the battery cell body 31.

[0140] The first adapter 41 and the second adapter 42 may 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 may be achieved by bonding, welding, riveting or other suitable methods.

[0141] 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 is assembled and connected to the electrode assembly 30. The insulating plate 43 can not only achieve insulation isolation between the first adapter 41 and the second pole tab 33, and between the second adapter 42 and the first pole tab 32, solving the problem of interference or overlap between the positive and negative poles, but also can fix the relative positions of the first adapter 41 and the second adapter 42 in advance, thereby improving the structural stability of the first adapter 41 and the second adapter 42.

[0142] According to the second aspect of the present application, the present embodiment further provides a battery 100, Fig. 9 1 is a schematic diagram of the structure of a battery provided by an embodiment of the present application. The battery 100 provided by the embodiment of the present application may include a battery cell 1 provided by any of the above embodiments.

[0143] In the battery 100, there may be one or more battery cells 1. When there are more than one battery cells 1, the multiple battery cells 1 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 1 are connected in series and in parallel. The multiple battery cells 1 may be directly connected in series, in parallel, or in a 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 may also be a battery module formed by connecting multiple battery cells 1 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are 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.

[0144] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, the electrical device comprising the battery 100 provided in any of the above embodiments, the battery 100 being used to provide electrical energy.

[0145] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0146] 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. The first adapter 41 and the second adapter 42 may both be in a sawtooth structure. Specifically, the first adapter 41 may include a first body 413 and a first connection portion 414 protruding from the first body 413 along the first direction X, and the second adapter 42 may include a second body 423 and a second connection portion 424 protruding from the second body 423 along the first direction X. The first connection portion 414 and the second connection portion 424 have a large area, which can increase the connectable area of ​​the first adapter 41 and the first pole tab 32, and the connectable area of ​​the second adapter 42 and the second pole tab 33. The protruding directions of the first connection portion 414 and the second connection portion 424 are arranged facing each other, and are arranged alternately and spaced along the second direction Y, so as to increase the area of ​​the first connection portion 414 and the second connection portion 424 as much as possible within a limited space. The first adapter 41 and the second adapter 42 are coated with an insulating layer on the side facing the battery body 31, and the side of the first adapter 41 and the second adapter 42 facing each other. An insulating plate 43 may also be provided on one side of the first adapter 41 and the second adapter 42 facing the cell body 31 .

[0147] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: include: The housing comprises a first side plate and a second side plate which are adjacently arranged; 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 pole ear and at least one second pole ear, the first pole ear and the second pole ear having opposite polarities, and the first pole ear and the second pole ear extending 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 a side of the battery cell body facing the first side plate to a 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, characterized in that: 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, characterized in that: The first adapter and the second adapter are arranged at intervals 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, characterized in that: 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 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.

5. The battery cell according to claim 3, characterized in that: 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 body along the first direction satisfy: 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 claim 2, characterized in that: The at least one first pole lug and the at least one second pole lug are arranged at intervals along the second direction, the second section extends along the second direction, the first pole lug is connected to the second section of the first adapter, and the second pole lug is connected to the second section of the second adapter.

7. The battery cell according to claim 6, characterized in that: The number of the first pole lug and the number of the second pole lug are both multiple; The plurality of first pole tabs and the plurality of second pole tabs are alternately distributed along the second direction.

8. The battery cell according to claim 1, characterized in that: The at least one first pole lug and the at least one second pole lug 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, wherein the connecting portion protrudes from the main body along a first direction, the first direction intersects with the second direction, the first pole ear is connected to the connecting portion of the first adapter, and the second pole ear is connected to the connecting portion of the second adapter.

9. The battery cell according to claim 8, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: A first insulating layer is provided on a side of the first adapter facing the battery cell body and a side of the second adapter facing the battery cell body, and a second insulating layer is provided on a side of the second adapter facing the battery cell body and a side of the first adapter facing the battery cell body.

12. The battery cell according to claim 1, characterized in that: 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 claim 1, characterized in that: The first side plate and the second side plate 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, characterized in that: Comprising a battery cell according to any one of claims 1-13.

15. An electrical device, characterized in that: A battery according to claim 14, for providing electrical energy.

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