Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter, the shell comprises a first wall, the first wall comprises a first part and a second part, the inner side of the first part is provided with a first concave part, and the first concave part is concave relative to the inner side surface of the second part. The electrode terminal is arranged on the second part, at least part of the electrode assembly is contained in the shell, and the electrode assembly comprises an electrode body and a tab. The adapter comprises a first adapter part and a second adapter part which are connected with each other, at least part of the first adapter part is accommodated in the first concave part and is electrically connected to the tab, and at least part of the second adapter part is arranged between the second part and the electrode main body and is electrically connected to the electrode terminal. Wherein the first switching part comprises a thickening part, the minimum thickness of the thickening part is larger than the maximum thickness of the second switching part, and at least part of the thickening part is contained in the first concave part. According to the invention, the electrical performance of the battery monomer can be improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] In the development of battery technology, improving the electrical performance of individual battery cells is a continuous research direction. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can effectively improve the electrical performance of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, electrode terminals, an electrode assembly, and an adapter. The housing includes a first wall, which comprises a first portion and a second portion. The inner side of the first portion has a first recess, which is recessed relative to the inner surface of the second portion. The electrode terminals are disposed in the second portion, and at least a portion of the electrode assembly is accommodated within the housing. The electrode assembly includes an electrode body and tabs extending from the electrode body.

[0006] The adapter includes a first adapter portion and a second adapter portion connected to each other. At least a portion of the first adapter portion is accommodated within a first recess and electrically connected to an electrode tab. At least a portion of the second adapter portion is disposed between a second portion and an electrode body and electrically connected to an electrode terminal. The first adapter portion includes a thickened portion, the minimum thickness of which is greater than the maximum thickness of the second adapter portion, and at least a portion of the thickened portion is accommodated within the first recess.

[0007] The above technical solution increases the usable space between the first wall and the electrode assembly by providing a first recess on the first wall, and uses the space corresponding to the first recess to provide a thickened part on the adapter to improve the current carrying capacity of the adapter, thereby effectively improving the electrical performance of the battery cell.

[0008] In some embodiments of the first aspect, the first adapter further includes a connecting portion connected to the electrode tab, and a thickened portion connected between the connecting portion and the second adapter, wherein the minimum thickness of the thickened portion is greater than the maximum thickness of the connecting portion.

[0009] The thickened portion is connected between the connecting portion and the second adapter portion, so that the thickened portion can be located between the first connecting area and the second connecting area. This not only reduces the interference of the thickened portion on the electrode tab, but also improves the current carrying capacity of the adapter while reducing the use of materials and lowering costs.

[0010] In some embodiments of the first aspect, the first recess includes a bottom surface and a first side surface, the first side surface being connected to one end of the bottom surface near the second portion and inclined relative to the bottom surface in a direction close to the electrode assembly. In the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tab lies within the orthographic projection of the bottom surface. In the thickness direction, at least a portion of the thickened portion is disposed between the first side surface and the electrode body.

[0011] By placing at least a portion of the thickened portion between the first side and the electrode body, the inclined first side can play a certain guiding role, reducing the assembly difficulty between the first wall and the adapter.

[0012] In some embodiments of the first aspect, the second transition portion includes a first surface facing the first wall and a second surface facing the electrode body. The thickened portion includes a first thickened portion, which includes a third surface and a fourth surface disposed opposite to each other, the third surface being connected to the first surface and the fourth surface being connected to the second surface. The third surface includes a first plane, which is inclined relative to the first surface in a direction close to the first wall.

[0013] By setting an inclined first plane, the thickened portion can make better use of the space formed by the first recess on the first side, thereby improving the space utilization rate inside the battery cell.

[0014] In some embodiments of the first aspect, the first plane is arranged parallel to the first side surface.

[0015] This can further improve the utilization rate of the space formed by the thickened portion at the position of the first recess on the first side.

[0016] In some embodiments of the first aspect, the third surface further includes a second plane and a third plane, the third plane connecting the second plane and the first surface, and the second plane connecting the first plane and the third plane. The third plane is inclined relative to the first surface in a direction close to the first wall, the second plane intersects the first plane, and the second plane intersects the third plane.

[0017] By introducing a second and a third plane, a stepped structure can be formed at the location of the first thickened portion. Various stepped structures of different shapes can be obtained by adjusting the tilt angle or size of the second and third planes, thus flexibly meeting the needs of battery cells with different structures. This not only provides greater freedom in the overall design of the adapter but also significantly improves its adaptability and reliability in different application scenarios.

[0018] In some embodiments of the first aspect, the second plane is parallel to the first surface, and / or the first plane is parallel to the third plane. This allows for a more regular overall structure of the adapter and reduces manufacturing difficulty.

[0019] In some embodiments of the first aspect, the first distance d1 between the second plane and the first surface in the thickness direction is 0.5 mm to 10 mm.

[0020] By setting the first spacing d1 to be greater than or equal to 0.5 mm, the overall thickening effect of the first thickened part can be increased, thereby improving the current carrying capacity of the adapter and effectively improving the electrical performance of the battery cell. By setting the first spacing d1 to be less than or equal to 10 mm, the risk of serious interference between the first thickened part and the first wall can be reduced, thereby improving the reliability of the battery cell.

[0021] In some embodiments of the first aspect, the first spacing d1 is 1mm-6mm. This further balances the electrical performance and reliability of the battery cells.

[0022] In some embodiments of the first aspect, the first portion and the second portion are disposed along a first direction, which is perpendicular to the thickness direction, and in the first direction, the second distance d2 between the third plane and the first plane is 0.5mm-10mm.

[0023] By setting the second spacing d2 to be greater than or equal to 0.5 mm, the overall thickening effect of the first thickened part can be increased, thereby improving the current carrying capacity of the adapter and effectively improving the electrical performance of the battery cell. By setting the second spacing d2 to be less than or equal to 10 mm, the risk of serious interference between the first thickened part and the first wall can be reduced, thereby improving the reliability of the battery cell.

[0024] In some embodiments of the first aspect, the second spacing d2 is 1mm-6mm. This further balances the electrical performance and reliability of the battery cells.

[0025] In some embodiments of the first aspect, the fourth surface includes a fourth plane that is inclined relative to the second surface in a direction close to the first wall.

[0026] It can increase the distance between the first thickened part and the electrode body to a certain extent, thereby reducing the risk of serious interference between the first thickened part and the electrode body, which could lead to damage to the electrode body.

[0027] In some embodiments of the first aspect, the fourth plane is arranged parallel to the first plane. This allows for a more regular overall structure of the adapter and reduces manufacturing difficulty.

[0028] In some embodiments of the first aspect, the minimum distance f between the first plane and the fourth plane is 1mm-10mm.

[0029] By setting the minimum spacing f to be greater than or equal to 1 mm, the overall thickening effect of the first thickened part can be increased, thereby improving the current carrying capacity of the adapter and effectively improving the electrical performance of the battery cell. By setting the minimum spacing f to be less than or equal to 10 mm, the risk of serious interference between the first thickened part and the first wall or electrode assembly can be reduced, thereby improving the reliability of the battery cell.

[0030] In some embodiments of the first aspect, the minimum spacing f is 1.5mm-6mm. This further balances the electrical performance and reliability of the battery cells.

[0031] In some embodiments of the first aspect, the fourth surface includes a fifth plane and an arcuate surface, the fifth plane connecting the arcuate surface and the second surface, the arcuate surface connecting the fourth plane and the fifth plane, and the arcuate surface curving away from the third surface.

[0032] The smooth structure of the arc-shaped surface not only reduces the risk of the first thickened part piercing the electrode body, but also reduces the risk of stress concentration in the first thickened part, improving the reliability of the adapter. The fifth plane acts as a transition between the arc-shaped surface and the second surface, not only improving the smoothness of the entire fourth surface, but also helping to reduce the difficulty of processing.

[0033] In some embodiments of the first aspect, the fifth plane is flush with the second surface. This allows for a more regular overall structure of the adapter and reduces manufacturing difficulty.

[0034] In some embodiments of the first aspect, the first surface and the second surface are arranged in parallel, and the first angle between the first plane and the first surface is greater than the second angle between the fourth plane and the second surface.

[0035] The above technical solution not only helps to achieve a smooth transition between the fourth plane and the arc surface, but also improves the thickening effect of the first thickened part at the corresponding positions of the first plane and the fourth plane, so as to further improve the flow capacity of the adapter.

[0036] In some embodiments of the first aspect, the thickened portion further includes a second thickened portion connected to the end of the first thickened portion away from the second adapter portion, and the first thickened portion is bent relative to the second thickened portion in a direction close to the electrode assembly.

[0037] By introducing a second thickened section, the overall thickening effect of the thickened section can be further improved, thereby further enhancing the flow capacity of the adapter.

[0038] In some embodiments of the first aspect, in the thickness direction, all of the first thickened portion is disposed between the first side surface and the electrode body, and all of the second thickened portion is disposed between the bottom surface and the electrode body.

[0039] By setting the first thickened part to correspond one-to-one with the first side surface and the second thickened part to the bottom surface, the first thickened part can be designed with a targeted structure according to the space corresponding to the first side surface, and the second thickened part can be designed with a targeted structure according to the space corresponding to the bottom surface, thereby reducing the overall design difficulty of the thickened part.

[0040] In some embodiments of the first aspect, the first recess includes a bottom surface and a first side surface, the first side surface being connected to one end of the bottom surface near the second portion and inclined relative to the bottom surface in a direction close to the electrode assembly. In the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tab lies within the orthographic projection of the bottom surface. In the thickness direction, at least a portion of the thickened portion is disposed between the bottom surface and the electrode body.

[0041] By placing at least a portion of the thickened portion between the bottom surface and the electrode body, the space corresponding to the bottom surface is larger than that of the first side surface. This not only improves the thickening effect of the thickened portion but also reduces the difficulty of setting the thickened portion.

[0042] In some embodiments of the first aspect, the thickened portion includes a second thickened portion disposed between the bottom surface and the electrode body in the thickness direction.

[0043] In some embodiments of the first aspect, a portion of the tab is electrically connected to the second thickened portion.

[0044] By providing a second thickened section, a portion of the tabs that are misaligned in the first direction can be connected, thereby increasing the connection area between the adapter and the tabs as a whole to a certain extent, thus improving the electrical performance of the battery cell.

[0045] In some embodiments of the first aspect, the first dimension h1 of the second thickened portion along the thickness direction is 0.2mm-8mm.

[0046] By setting the first dimension h1 to be greater than or equal to 0.2 mm, the overall thickening effect of the second thickened part can be increased, thereby improving the current carrying capacity of the adapter and effectively improving the electrical performance of the battery cell. By setting the first dimension h1 to be less than or equal to 8 mm, the risk of serious interference between the second thickened part and the first wall or electrode assembly can be reduced, thereby improving the reliability of the battery cell.

[0047] In some embodiments of the first aspect, the first dimension h1 is 0.5mm-4mm. This further balances the electrical performance and reliability of the battery cell.

[0048] In some embodiments of the first aspect, the first transition portion further includes a connecting portion connected to the thickened portion. The connecting portion is connected to the tab, and in the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tab overlaps with the orthographic projection of the connecting portion. The minimum thickness of the thickened portion is greater than the maximum thickness of the connecting portion.

[0049] The above technical solution can greatly increase the range of thickened parts, thereby significantly improving the flow capacity of the adapter.

[0050] In some embodiments of the first aspect, along the thickness direction of the first wall, the first portion protrudes from the side surface of the second portion facing away from the electrode assembly.

[0051] The space created by the height difference between the first and second parts in the thickness direction helps to reduce the overall volume of the battery cell and increase its energy density.

[0052] In some embodiments of the first aspect, the first portion and the second portion are disposed along a first direction, which is perpendicular to the thickness direction of the first wall. In the same plane perpendicular to the first direction, the orthographic projection of the electrode terminal at least partially overlaps with the orthographic projection of the tab.

[0053] This allows the electrode terminals and tabs to make better use of the space formed by the height difference in the thickness direction between the first and second parts, which is beneficial for reducing the size of the battery cell and increasing the energy density of the battery cell.

[0054] In some embodiments of the first aspect, there are two first portions, which are respectively connected to the two ends of the second portion along a first direction, which is perpendicular to the thickness direction of the first wall.

[0055] This allows the first recesses corresponding to the two first parts to accommodate two tabs with opposite polarities, and the tabs with opposite polarities are separated by the second part, reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0056] In some embodiments of the first aspect, there are two second portions, which are respectively connected to the two ends of the first portion along a first direction, which is perpendicular to the thickness direction of the first wall.

[0057] This allows the electrode terminals to be located at the edge of the first wall, making it easier to connect the battery cells to other structures, reducing the risk of interference when connecting the battery cells to other structures, and improving the stability of the electrical connection.

[0058] In some embodiments of the first aspect, the housing includes an end cap and a housing having an opening, the end cap closing onto the opening, and the end cap being configured as a first wall.

[0059] Secondly, this application provides a battery device that includes a battery cell provided in any of the embodiments of the first aspect.

[0060] Thirdly, this application provides an electrical device that includes a battery cell provided in any embodiment of the first aspect or a battery device provided in any embodiment of the second aspect, wherein the battery cell or battery device is used to store or provide electrical energy.

[0061] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0062] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0063] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0064] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0065] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0066] Figure 4 A three-dimensional structural schematic diagram of a battery cell provided in some embodiments of this application;

[0067] Figure 5 This is a top view of a single battery cell provided in some embodiments of this application;

[0068] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along AA;

[0069] Figure 7 for Figure 6 A magnified schematic diagram of the local structure at point H;

[0070] Figure 8 This is a top view of another battery cell provided in some embodiments of this application;

[0071] Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure along BB;

[0072] Figure 10 for Figure 9 A magnified schematic diagram of the local structure at point K;

[0073] Figure 11 This is a top view of another battery cell provided in some embodiments of this application;

[0074] Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure along DD;

[0075] Figure 13 for Figure 12 A magnified schematic diagram of the local structure at point M;

[0076] Figure 14 This is a top view of another battery cell provided in some embodiments of this application;

[0077] Figure 15 for Figure 14 Schematic diagram of the cross-sectional structure along CC;

[0078] Figure 16 for Figure 15 A magnified schematic diagram of the local structure at point L;

[0079] Figure 17 for Figure 16 A partial schematic diagram of the adapter structure shown;

[0080] Figure 18 This is a top view of a battery cell provided in some embodiments of this application;

[0081] Figure 19 for Figure 18 Schematic diagram of the cross-sectional structure along EE;

[0082] Figure 20 for Figure 19A magnified schematic diagram of the local structure at point N;

[0083] Figure 21 This is a three-dimensional structural diagram of another battery cell provided in some embodiments of this application.

[0084] The reference numerals in the detailed embodiments are as follows:

[0085] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 6. Battery module; 7. Battery cell;

[0086] 10. Outer shell; 10a. Housing; 10b. End cap;

[0087] 11. First wall; 111. First part; 112. Second part; 113. First recess; 1131. Bottom surface; 1132. First side surface;

[0088] 20. Electrode terminals;

[0089] 30. Electrode assembly; 31. Electrode body; 32. Tab;

[0090] 40. Adapter; 41. First adapter portion; 411. Thickened portion; 411a. First thickened portion; 411b. Second thickened portion; 412. Connecting portion; 42. Second adapter portion; 421. First surface; 422. Second surface;

[0091] 50. Third surface; 51. First plane; 52. Second plane; 53. Third plane;

[0092] 60. Fourth surface; 61. Fourth plane; 62. Fifth plane; 63. Curved surface;

[0093] a1, First angle; a2, Second angle;

[0094] X, first direction; Z, thickness direction. Detailed Implementation

[0095] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0096] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0097] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0098] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0099] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0100] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0101] In this application, "multiple" means two or more (including two).

[0102] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0103] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0104] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0105] In the development of battery technology, improving the electrical performance of individual battery cells is a continuous research direction.

[0106] The battery cell includes a casing, electrode terminals, electrode assemblies, and an adapter. The electrode assembly includes an electrode body and tabs extending from the electrode body. The adapter is electrically connected to the tabs and the electrode terminals.

[0107] The thickness of the adapter is directly related to its current-carrying capacity; to increase the current-carrying capacity, the thickness of the adapter needs to be increased. However, in related technologies, the internal space of a battery cell is limited, and the thickness of the adapter is difficult to increase due to the constraints of the casing and electrode components. This limits the current-carrying capacity of the adapter, resulting in poor electrical performance of the battery cell.

[0108] Based on the above considerations, this application designs a battery cell, which includes a casing, electrode terminals, an electrode assembly, and an adapter. The casing includes a first wall, which comprises a first portion and a second portion. The first wall has a first recess at a position corresponding to the first portion, and the first recess is recessed relative to the inner surface of the second portion. The electrode terminals are disposed in the second portion, and at least a portion of the electrode assembly is accommodated within the casing. The electrode assembly includes an electrode body and tabs extending from the electrode body.

[0109] The adapter includes a first adapter portion and a second adapter portion. At least a portion of the first adapter portion is accommodated within a first recess and electrically connected to an electrode tab. At least a portion of the second adapter portion is disposed between a second portion and an electrode body and electrically connected to an electrode terminal. The first adapter portion includes a thickened portion, the minimum thickness of which is greater than the maximum thickness of the second adapter portion, and at least a portion of the thickened portion is accommodated within the first recess.

[0110] By providing a first recess on the first wall, the usable space between the first wall and the electrode assembly is increased, and a thickened portion is provided on the adapter using the space corresponding to the first recess to improve the current carrying capacity of the adapter, thereby effectively improving the electrical performance of the battery cell.

[0111] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0112] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0113] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0114] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0115] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0116] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0117] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0118] In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0119] A battery cell assembly may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0120] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0121] As an example, a single 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-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0122] As an example, a battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0123] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module 6, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module 6 can be formed by bundling multiple battery cells together with cable ties.

[0124] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies housed within the housing 5. As an example, the battery cell assembly may be a battery module 6, which can be housed within the housing by securing the battery module 6 to the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0125] In some embodiments, the housing 5 is used to house individual battery cells, and the housing 5 can have various structures.

[0126] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0127] In some embodiments, the housing 5 may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, forming an enclosed space inside the housing to accommodate individual battery cells. As an example, the frame may include multiple side beams.

[0128] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0129] In some embodiments, the battery device 2 may be an energy storage device.

[0130] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0131] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0132] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0133] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or a combination of both to form a battery module 6. These battery modules 6 are then connected in series, parallel, or a combination of both to form a whole, which is housed within the casing.

[0134] Multiple battery cells 7 in battery module 6 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6. There can be one or more busbars, each used to electrically connect at least two battery cells 7.

[0135] This application provides a battery cell that includes a housing and an electrode assembly housed within the housing.

[0136] In some embodiments, the outer casing may be a steel casing, an aluminum casing, or a composite metal casing (such as a copper-aluminum composite casing).

[0137] The outer shell can be a hollow structure, with an internal cavity for accommodating the electrode assembly and electrolyte.

[0138] In some embodiments, the casing of the battery cell is a cylindrical casing, a square casing, a prismatic casing, or a casing of other shapes.

[0139] In some embodiments, the housing includes a housing and an end cap, the housing having an opening and the end cap being connected to the housing and covering the opening;

[0140] The housing is a component used to fit the end cap to form the internal cavity of the battery cell. The formed internal cavity can be used to house the electrode assembly, electrolyte, and other components.

[0141] The housing and end cap can be separate components. For example, an opening can be provided on the housing, and the end cap can be used to close the opening to form an internal cavity for the battery cell.

[0142] The housing can come in various shapes and sizes, such as cuboid or cylindrical. Specifically, the shape of the housing can be determined based on the specific shape and size of the electrode assembly. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy.

[0143] The shape of the end cap can be adapted to the shape of the housing to fit the housing. The material of the end cap can be the same as or different from that of the housing. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cap is not easily deformed when subjected to compression and impact, enabling the battery cell to have higher structural strength and improve reliability.

[0144] The end caps are attached to the housing by welding, bonding, snap-fitting, or other means.

[0145] The housing may be open at one end or at both ends. In some examples, the housing may be a structure with an opening on one side, with one end cap fitting over the housing. In other examples, the housing may be a structure with openings on both sides, with two end caps fitting over the two openings of the housing, respectively.

[0146] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies.

[0147] In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and a separator, wherein the positive electrode and the negative electrode have opposite polarities, and the separator separates the positive electrode and the negative electrode.

[0148] At least a portion of the separator is located between the positive and negative electrode plates. During the charging and discharging of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrode plates. The separator, positioned between the positive and negative electrode plates, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0149] In some embodiments, the positive electrode may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector.

[0150] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0151] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0152] As an example, the positive electrode film layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this 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. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0153] In some embodiments, the negative electrode may include a negative current collector.

[0154] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0155] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector.

[0156] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0157] As an example, the negative electrode film layer includes a negative electrode active material, which may be a negative electrode active material 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, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0158] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0159] In some embodiments, the separator includes a separator membrane. The separator membrane in this application can be any known porous membrane with good chemical and mechanical stability.

[0160] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different.

[0161] Inorganic particle coating, organic particle coating, or organic / inorganic composite coating can also be applied to the surface of the separator.

[0162] The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surface of the positive or negative electrode.

[0163] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0164] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte used in this application can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0165] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0166] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0167] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0168] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0169] In some embodiments, the gel electrolyte comprises a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0170] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0171] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0172] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0173] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0174] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0175] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0176] In some implementations, the electrode assembly is a stacked structure.

[0177] As an example, multiple positive and negative electrode plates can be set, with multiple positive and multiple negative electrode plates stacked alternately. As an example, multiple positive electrode plates can be set, and negative electrode plates are folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0178] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0179] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0180] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0181] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0182] In some embodiments, the positive current collector may include a positive tab, and the negative current collector may include a negative tab. The positive and negative tabs can be used to transmit current. As an example, at least a portion of the positive tab is not coated with a positive film layer, and at least a portion of the negative tab is not coated with a negative film layer.

[0183] In some embodiments, the electrode assembly is a wound structure. The positive electrode tab is wound multiple turns along the winding direction. Optionally, the end of the positive electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. Optionally, the positive electrode tab is annular.

[0184] In some embodiments, the negative electrode tab is wound multiple turns along the winding direction. Optionally, the end of the negative electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. The negative electrode tab is annular.

[0185] In some embodiments, the electrode assembly includes an electrode body. As an example, the electrode body includes a positive electrode film, a portion of the positive electrode current collector covered by the positive electrode film, a negative electrode film, a portion of the negative electrode current collector covered by the negative electrode film, and a separator.

[0186] The positive and negative tabs can be led out from the same end of the electrode body, or they can be led out from opposite ends of the electrode body. At least a portion of the positive tab protrudes to the outside of the insulating member, and at least a portion of the negative tab protrudes to the outside of the insulating member.

[0187] In some embodiments, a battery cell includes a positive electrode lead and a negative electrode lead, wherein the positive electrode lead is electrically connected to a positive electrode plate and the negative electrode lead is electrically connected to a negative electrode plate.

[0188] The positive and negative leads are used to connect to the external circuit to enable charging or discharging of the battery cells.

[0189] In some embodiments, the positive lead-out portion includes a positive terminal. At least a portion of the positive terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0190] As an example, the positive terminal may be a separately molded component that is mounted on the housing. Alternatively, the positive terminal may also be part of the housing.

[0191] In some examples, the positive terminal is directly connected to the positive plate; in other examples, the positive terminal and the positive plate are indirectly connected through other conductive structures, such as a positive adapter.

[0192] In some embodiments, the positive terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0193] In some embodiments, the negative lead-out portion includes a negative terminal. At least a portion of the negative terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0194] As an example, the negative terminal can be a separately molded component that is mounted on the housing. Alternatively, the negative terminal can also be part of the housing.

[0195] In some examples, the negative terminal is directly connected to the negative electrode plate; in other examples, the negative lead-out section also includes other conductive structures connecting the negative terminal and the negative electrode plate, such as a negative adapter.

[0196] In some embodiments, the negative terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0197] Figure 4 This is a three-dimensional structural diagram of a battery cell provided in some embodiments of this application. Figure 5 This is a top view schematic diagram of a single battery cell provided in some embodiments of this application. Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure along AA. Figure 7 for Figure 6 A magnified schematic diagram of the structure at point H.

[0198] Continue to refer to Figures 4 to 7 This application provides a battery cell 7, which includes a housing 10, electrode terminals 20, an electrode assembly 30, and an adapter 40. The housing 10 includes a first wall 11, which includes a first portion 111 and a second portion 112. The inner side of the first portion 111 has a first recess 113, which is recessed relative to the inner surface of the second portion 112. The electrode terminals 20 are disposed in the second portion 112. At least a portion of the electrode assembly 30 is accommodated within the housing 10. The electrode assembly 30 includes an electrode body 31 and tabs 32 extending from the electrode body 31.

[0199] The adapter 40 includes a first adapter portion 41 and a second adapter portion 42 connected to each other. At least a portion of the first adapter portion 41 is accommodated in a first recess 113 and electrically connected to the electrode tab 32. At least a portion of the second adapter portion 42 is disposed between the second portion 112 and the electrode body 31 and electrically connected to the electrode terminal 20. The first adapter portion 41 includes a thickened portion 411, the minimum thickness of which is greater than the maximum thickness of the second adapter portion 42, and at least a portion of the thickened portion 411 is accommodated in the first recess 113.

[0200] For example, the first recess 113 may be formed on the inner side of the first wall 11 by means of grooving, stamping, casting, bending or the like.

[0201] As an example, the tab 32 can be at least partially accommodated within the first recess 113, wherein the tab 32 can be fully accommodated within the first recess 113 or partially accommodated within the first recess 113.

[0202] By accommodating at least a portion of the tab 32 within the first recess 113, the tab 32 can fully utilize the space formed by the first recess 113, which is beneficial for reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7. In addition, by connecting the tab 32 and the electrode terminal 20 through the adapter 40, it is convenient to realize the electrical connection between the tab 32 and the electrode terminal 20 located within the first recess 113.

[0203] As an example, the tab 32 can also be disposed outside the first recess 113.

[0204] The presence of the first recess 113 means that, in the thickness direction Z of the first wall 11, the space between the first part 111 and the electrode assembly 30 is greater than the space between the second part 112 and the electrode assembly 30.

[0205] The adapter 40 is used to electrically connect the tab 32 and the electrode terminal 20 to transmit the electrical energy of the battery cell 7.

[0206] Optionally, the adapter 40 may be made of, but is not limited to, copper, copper alloy, aluminum, aluminum alloy, silver, nickel, or titanium, depending on the actual application environment.

[0207] The first adapter 41 and the second adapter 42 may be made of the same material or different materials.

[0208] As an example, the first adapter 41 and the second adapter 42 are made of the same material, which helps to simplify the manufacturing process and reduce costs.

[0209] At least a portion of the first adapter 41 is disposed between the first portion 111 and the electrode assembly 30. Exemplarily, the first adapter 41 may be entirely disposed between the first portion 111 and the electrode assembly 30, or a portion may be disposed between the first portion 111 and the electrode assembly 30.

[0210] At least a portion of the first adapter portion 41 is accommodated in the first recess 113. Exemplarily, the first adapter portion 41 may be fully accommodated in the first recess 113 or may be partially accommodated in the first recess 113.

[0211] The first adapter 41 can be directly connected to the electrode 32, or it can be indirectly connected to the electrode 32 through other components. As an example, the first adapter 41 is soldered to the electrode 32.

[0212] At least a portion of the second adapter 42 is disposed between the second portion 112 and the electrode body 31. Exemplarily, the second adapter 42 may be entirely disposed between the second portion 112 and the electrode assembly 30, or a portion may be disposed between the second portion 112 and the electrode assembly 30.

[0213] The second adapter 42 can be directly connected to the electrode terminal 20, or it can be indirectly connected to the electrode terminal 20 through other components. As an example, the second adapter 42 is soldered to the electrode terminal 20.

[0214] The first adapter 41 is connected to the second adapter 42. Exemplarily, the first adapter 41 and the second adapter 42 may be an integrally formed structure. Alternatively, the first adapter 41 and the second adapter 42 may be independent components connected by welding.

[0215] The thickened portion 411 is disposed on the first transition portion 41. The thickened portion 411 can be fully accommodated in the first recess 113, or it can be partially accommodated in the first recess 113.

[0216] The thickness of the thickened portion 411 can be understood as the distance between two large surfaces of the thickened portion 411, where the large surface refers to the surface with a larger area on the thickened portion 411. Thus, the minimum thickness of the thickened portion 411 can be understood as the minimum distance between two large surfaces of the thickened portion 411.

[0217] The thickness of the second transition portion 42 can be understood as the distance between the two large surfaces of the second transition portion 42, where the large surface refers to the surface with a larger area on the second transition portion 42. Thus, the maximum thickness of the second transition portion 42 can be understood as the maximum distance between the two large surfaces of the second transition portion 42.

[0218] The above technical solution increases the usable space between the first wall 11 and the electrode assembly 30 by providing a first recess 113 on the first wall 11, and uses the space corresponding to the first recess 113 to provide a thickened part 411 on the adapter 40 to improve the current carrying capacity of the adapter 40, thereby effectively improving the electrical performance of the battery cell 7.

[0219] In some embodiments, the first adapter 41 further includes a connecting portion 412 connected to the tab 32, and a thickened portion 411 connected between the connecting portion 412 and the second adapter 42, wherein the minimum thickness of the thickened portion 411 is greater than the maximum thickness of the connecting portion 412.

[0220] The connecting part 412 is connected to the tab 32 to form a first connecting area, and the second adapter part 42 is connected to the electrode terminal 20 to form a second connecting area.

[0221] The thickened portion 411 is connected between the connecting portion 412 and the second adapter portion 42, so that the thickened portion 411 can be located between the first connecting area and the second connecting area. This not only reduces the interference of the thickened portion 411 on the tab 32, but also improves the flow capacity of the adapter 40 while reducing the use of materials and lowering costs.

[0222] In some embodiments, at least a portion of the connecting portion 412 is accommodated in the first recess 113.

[0223] In some embodiments, the first recess 113 includes a bottom surface 1131 and a first side surface 1132. The first side surface 1132 is connected to one end of the bottom surface 1131 near the second portion 112 and is inclined relative to the bottom surface 1131 in a direction close to the electrode assembly 30. In the same plane perpendicular to the thickness direction Z of the first wall 11, the orthographic projection of the tab 32 lies within the orthographic projection of the bottom surface 1131. In the thickness direction Z, at least a portion of the thickened portion 411 is disposed between the first side surface 1132 and the electrode body 31.

[0224] The thickened portion 411 can be entirely disposed between the first side surface 1132 and the electrode body 31, or it can be partially disposed between the first side surface 1132 and the electrode body 31.

[0225] By placing at least a portion of the thickened portion 411 between the first side surface 1132 and the electrode body 31, the inclined first side surface 1132 can play a certain guiding role, reducing the assembly difficulty between the first wall 11 and the adapter 40.

[0226] In some embodiments, the second transition portion 42 includes a first surface 421 facing the first wall 11 and a second surface 422 facing the electrode body 31. The thickened portion 411 includes a first thickened portion 411a, which includes a third surface 50 and a fourth surface 60 disposed opposite to each other. The third surface 50 is connected to the first surface 421, and the fourth surface 60 is connected to the second surface 422. The third surface 50 includes a first plane 51, which is inclined relative to the first surface 421 in a direction close to the first wall 11.

[0227] The thickness of the second transition portion 42 can be understood as the distance between the opposing first surface 421 and the second surface 422. The maximum thickness of the second transition portion 42 can be understood as the maximum distance between the opposing first surface 421 and the second surface 422, and the minimum thickness of the second transition portion 42 can be understood as the minimum distance between the opposing first surface 421 and the second surface 422.

[0228] The thickness of the first thickened portion 411a can be understood as the distance between the opposing third surface 50 and the fourth surface 60. The maximum thickness of the first thickened portion 411a can be understood as the maximum distance between the opposing third surface 50 and the fourth surface 60, and the minimum thickness of the first thickened portion 411a can be understood as the minimum distance between the opposing third surface 50 and the fourth surface 60.

[0229] By setting an inclined first plane 51, the thickened portion 411 can make better use of the space formed by the first recess 113 at the position of the first side 1132, thereby improving the space utilization rate inside the battery cell 7.

[0230] It should be noted that the term "plane" in the first plane 51 is relative to "curved surface," meaning that the curved surface is generally curved, while the first plane 51 is generally straight. The above explanation applies to all structures involving "plane" in the following embodiments of this application.

[0231] In some embodiments, the first surface 421 and the third surface 50 can be connected by an arc surface to reduce the risk of stress concentration and reduce the difficulty of processing.

[0232] In some embodiments, the second surface 422 and the fourth surface 60 can be connected by an arc surface to reduce the risk of stress concentration and reduce the difficulty of processing.

[0233] In some embodiments, the first plane 51 is arranged parallel to the first side surface 1132. This can further improve the utilization rate of the space formed by the thickened portion 411 at the position of the first recess 113 on the first side surface 1132.

[0234] In some embodiments, the first plane 51 is directly connected to the first surface 421.

[0235] Figure 8 This is a top view schematic diagram of another battery cell provided in some embodiments of this application. Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure along BB. Figure 10 for Figure 9 A magnified schematic diagram of the local structure at point K.

[0236] Continue to refer to Figures 8 to 10 In some embodiments, the third surface 50 further includes a second plane 52 and a third plane 53, the third plane 53 connecting the second plane 52 and the first surface 421, and the second plane 52 connecting the first plane 51 and the third plane 53. The third plane 53 is inclined relative to the first surface 421 in a direction close to the first wall 11, the second plane 52 intersects with the first plane 51, and the second plane 52 intersects with the third plane 53.

[0237] By introducing the second plane 52 and the third plane 53, a stepped structure can be formed at the location of the first thickened portion 411a. Various stepped structures of different shapes can be obtained by adjusting the tilt angle or size of the second plane 52 and the third plane 53, thus flexibly meeting the needs of battery cells 7 with different structures. This not only provides greater freedom in the overall design of the adapter 40 but also significantly improves its adaptability and reliability in different application scenarios.

[0238] In some embodiments, the first plane 51 and the second plane 52 can be connected by an arc surface to reduce the risk of stress concentration and reduce the difficulty of processing.

[0239] In some embodiments, the second plane 52 and the third plane 53 can be connected by an arc surface to reduce the risk of stress concentration and reduce the difficulty of processing.

[0240] In some embodiments, the second plane 52 is parallel to the first surface 421, which can make the overall structure of the adapter 40 more regular and reduce the processing difficulty.

[0241] In some embodiments, the first plane 51 is parallel to the third plane 53, which makes the overall structure of the adapter 40 more regular and reduces the processing difficulty.

[0242] In some embodiments, the first distance d1 between the second plane 52 and the first surface 421 in the thickness direction Z is 0.5mm-10mm.

[0243] For example, the first spacing d1 can be understood as the thickness of the portion of the step structure formed by the first thickened portion 411a at the position of the second plane 52 that protrudes from the first surface 421 in the thickness direction Z.

[0244] As an example, the first spacing d1 can be, but is not limited to, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0245] By setting the first spacing d1 to be greater than or equal to 0.5 mm, the overall thickening effect of the first thickened portion 411a can be increased, thereby improving the current carrying capacity of the adapter 40 and effectively improving the electrical performance of the battery cell 7. By setting the first spacing d1 to be less than or equal to 10 mm, the risk of serious interference between the first thickened portion 411a and the first wall 11 can be reduced, thereby improving the reliability of the battery cell 7.

[0246] In some embodiments, the first spacing d1 is 1mm-6mm. This further balances the electrical performance and reliability of the battery cell 7.

[0247] As an example, the first spacing d1 can be, but is not limited to, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.

[0248] In some embodiments, the first portion 111 and the second portion 112 are disposed along a first direction X, which is perpendicular to the thickness direction Z. In the first direction X, the second distance d2 between the third plane 53 and the first plane 51 is 0.5mm-10mm.

[0249] For example, the second spacing d2 can be understood as the thickness of the portion of the step structure formed by the first thickened portion 411a at the position of the third plane 53 that protrudes from the first plane 51 in the first direction X.

[0250] As an example, the second spacing d2 can be, but is not limited to, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0251] By setting the second spacing d2 to be greater than or equal to 0.5 mm, the overall thickening effect of the first thickened portion 411a can be increased, thereby improving the current carrying capacity of the adapter 40 and effectively improving the electrical performance of the battery cell 7. By setting the second spacing d2 to be less than or equal to 10 mm, the risk of serious interference between the first thickened portion 411a and the first wall 11 can be reduced, thereby improving the reliability of the battery cell 7.

[0252] In some embodiments, the second spacing d2 is 1mm-6mm. This further balances the electrical performance and reliability of the battery cell 7.

[0253] As an example, the second spacing d2 can be, but is not limited to, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.

[0254] In some embodiments, the fourth surface 60 includes a fourth plane 61 that is inclined relative to the second surface 422 in a direction close to the first wall 11.

[0255] This can increase the distance between the first thickened portion 411a and the electrode body 31 to a certain extent, thereby reducing the risk of serious interference between the first thickened portion 411a and the electrode body 31, which could lead to damage to the electrode body 31.

[0256] Figure 11 This is a top view schematic diagram of another battery cell provided in some embodiments of this application. Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure along DD. Figure 13 for Figure 12 A magnified schematic diagram of the structure at point M.

[0257] Continue to refer to Figures 11 to 13 In some embodiments, the fourth plane 61 is arranged parallel to the first plane 51, which makes the overall structure of the adapter 40 more regular and reduces the processing difficulty.

[0258] In some embodiments, the fourth plane 61 is directly connected to the second surface 422.

[0259] In some embodiments, the minimum distance f between the first plane 51 and the fourth plane 61 is 1mm-10mm.

[0260] For example, the minimum spacing f can be understood as the minimum thickness of the first thickened portion 411a.

[0261] As an example, the minimum spacing f can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0262] By setting the minimum spacing f to be greater than or equal to 1 mm, the overall thickening effect of the first thickened portion 411a can be increased, thereby improving the current carrying capacity of the adapter 40 and effectively improving the electrical performance of the battery cell 7. By setting the minimum spacing f to be less than or equal to 10 mm, the risk of serious interference between the first thickened portion 411a and the first wall 11 or the electrode assembly 30 can be reduced, thereby improving the reliability of the battery cell 7.

[0263] In some embodiments, the minimum spacing f is 1.5mm-6mm. This further balances the electrical performance and reliability of the battery cell 7.

[0264] As an example, the minimum spacing f can be, but is not limited to, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc.

[0265] Figure 14 This is a top view schematic diagram of another battery cell provided in some embodiments of this application. Figure 15 for Figure 14 A schematic diagram of the cross-sectional structure along CC. Figure 16 for Figure 15 A magnified schematic diagram of the local structure at point L. Figure 17 for Figure 16 A partial schematic diagram of the adapter structure shown.

[0266] Continue to refer to Figures 14 to 17 In some embodiments, the fourth surface 60 includes a fifth plane 62 and an arcuate surface 63, the fifth plane 62 being connected between the arcuate surface 63 and the second surface 422, the arcuate surface 63 being connected between the fourth plane 61 and the fifth plane 62, and the arcuate surface 63 being curved in a direction away from the third surface 50.

[0267] The smooth structure of the arc surface 63 can not only reduce the risk of the first thickened part 411a piercing the electrode body 31, but also reduce the risk of stress concentration in the first thickened part 411a, thereby improving the reliability of the adapter 40.

[0268] The fifth plane 62 can act as a transition between the arc surface and the second surface 422, which not only improves the smoothness of the entire fourth surface 60, but also helps to reduce the difficulty of processing.

[0269] As an example, the curved surface 63 can be a circular arc surface.

[0270] In some embodiments, the fifth plane 62 is flush with the second surface 422, which makes the overall structure of the adapter 40 more regular and reduces the difficulty of processing.

[0271] In some embodiments, the first surface 421 and the second surface 422 are arranged in parallel, and the first angle a1 between the first plane 51 and the first surface 421 is greater than the second angle a2 between the fourth plane 61 and the second surface 422.

[0272] Due to the presence of the fifth plane 62, there is a certain distance between the arcuate surface 63 and the second surface 422 in the first direction X.

[0273] Thus, the above technical solution not only helps to achieve a smooth transition between the fourth plane 61 and the arc surface, but also improves the thickening effect of the first thickened part 411a at the corresponding positions of the first plane 51 and the fourth plane 61, so as to further improve the flow capacity of the adapter 40.

[0274] In some embodiments, the thickened portion 411 further includes a second thickened portion 411b, which is connected to the end of the first thickened portion 411a away from the second adapter portion 42, and the first thickened portion 411a is bent relative to the second thickened portion 411b in a direction close to the electrode assembly 30.

[0275] The second thickened portion 411b can be directly connected to the first thickened portion 411a, or it can be indirectly connected to the first thickened portion 411a through other components.

[0276] At least a portion of the second thickened portion 411b is disposed between the bottom surface 1131 and the electrode body 31. Exemplarily, the second thickened portion 411b may be entirely disposed between the bottom surface 1131 and the electrode body 31, or it may be partially disposed between the bottom surface 1131 and the electrode body 31.

[0277] The thickness of the first thickened portion 411a and the thickness of the second thickened portion 411b can be the same or different.

[0278] The first thickened portion 411a and the second thickened portion 411b can be made of the same material or different materials.

[0279] As an example, the first thickened portion 411a and the second thickened portion 411b are made of the same material, which helps to simplify the manufacturing process and reduce costs.

[0280] By further introducing a second thickened portion 411b, the overall thickening effect of the thickened portion 411 can be further improved, thereby further enhancing the flow capacity of the adapter 40.

[0281] In some embodiments, in the thickness direction Z, all the first thickened portions 411a are disposed between the first side surface 1132 and the electrode body 31, and all the second thickened portions 411b are disposed between the bottom surface 1131 and the electrode body 31.

[0282] By setting the first thickened portion 411a to the first side surface 1132 and the second thickened portion 411b to the bottom surface 1131 in a one-to-one correspondence, the first thickened portion 411a can be designed with a targeted structure according to the space corresponding to the first side surface 1132, and the second thickened portion 411b can be designed with a targeted structure according to the space corresponding to the bottom surface 1131, thereby reducing the overall design difficulty of the thickened portion 411.

[0283] Figure 18This is a top view schematic diagram of another battery cell provided in some embodiments of this application. Figure 19 for Figure 18 A schematic diagram of the cross-sectional structure along EE. Figure 20 for Figure 19 A magnified schematic diagram of the structure at point N.

[0284] Continue to refer to Figures 18 to 20 In some embodiments, the first recess 113 includes a bottom surface 1131 and a first side surface 1132. The first side surface 1132 is connected to one end of the bottom surface 1131 near the second portion 112 and is inclined relative to the bottom surface 1131 in a direction close to the electrode assembly 30. In the same plane perpendicular to the thickness direction Z of the first wall 11, the orthographic projection of the tab 32 lies within the orthographic projection of the bottom surface 1131. In the thickness direction Z, at least a portion of the thickened portion 411 is disposed between the bottom surface 1131 and the electrode body 31.

[0285] The thickened portion 411 can be entirely disposed between the bottom surface 1131 and the electrode body 31, or it can be partially disposed between the bottom surface 1131 and the electrode body 31.

[0286] By placing at least a portion of the thickened portion 411 between the bottom surface 1131 and the electrode body 31, the space corresponding to the bottom surface 1131 is larger than that of the first side surface 1132. This not only improves the thickening effect of the thickened portion 411, but also reduces the difficulty of setting the thickened portion 411.

[0287] In some embodiments, the thickened portion 411 includes a second thickened portion 411b, which is disposed between the bottom surface 1131 and the electrode body 31 in the thickness direction Z.

[0288] As an example, in the thickness direction Z, the second thickened portion 411b may be entirely disposed between the bottom surface 1131 and the electrode body 31.

[0289] In some embodiments, a portion of the tab 32 is electrically connected to the second thickened portion 411b.

[0290] For example, the tab 32 may include a plurality of tab portions stacked along the thickness direction Z. The plurality of tab portions include a first tab portion and a second tab portion. The second tab portion protrudes from the side of the first tab portion along the first direction X near the second thickened portion 411b, and the second tab portion is connected to the second thickened portion 411b. The second tab portion can be understood as a portion of the tab portion that is misaligned in the first direction X during the bending process of the tab 32.

[0291] By providing the second thickened portion 411b, a portion of the tabs 32 that are misaligned in the first direction X can be connected, thereby increasing the overall connection area between the adapter 40 and the tabs 32 to a certain extent, and thus improving the electrical performance of the battery cell 7.

[0292] In some embodiments, the second electrode ear is connected to the side surface of the second thickened portion 411b facing the electrode body 31.

[0293] In some embodiments, the second electrode ear is welded to the second thickened portion 411b.

[0294] In some embodiments, the first electrode ear is connected to the connecting portion 412.

[0295] In some embodiments, the first dimension h1 of the second thickened portion 411b along the thickness direction Z is 0.2mm-8mm.

[0296] For example, the first dimension h1 can be understood as the thickness of the second thickened portion 411b.

[0297] As an example, the first dimension h1 can be, but is not limited to, 0.2mm, 0.8mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc.

[0298] By setting the first dimension h1 to be greater than or equal to 0.2 mm, the overall thickening effect of the second thickened portion 411b can be increased, thereby improving the current carrying capacity of the adapter 40 and effectively improving the electrical performance of the battery cell 7. By setting the first dimension h1 to be less than or equal to 8 mm, the risk of serious interference between the second thickened portion 411b and the first wall 11 or the electrode assembly 30 can be reduced, thereby improving the reliability of the battery cell 7.

[0299] In some embodiments, the first dimension h1 is 0.5mm-4mm. This further balances the electrical performance and reliability of the battery cell 7.

[0300] As an example, the first dimension h1 can be, but is not limited to, 0.5mm, 0.7mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0301] In some embodiments, the first adapter 41 further includes a connecting portion 412 connected to the thickened portion 411. The connecting portion 412 is connected to the tab 32. In the same plane perpendicular to the thickness direction Z of the first wall 11, the orthographic projection of the tab 32 overlaps with the orthographic projection of the connecting portion 412. The minimum thickness of the thickened portion 411 is greater than the maximum thickness of the connecting portion 412.

[0302] In this embodiment, the connecting portion 412 can be understood as the connection area formed after the first adapter portion 41 is connected to the tab 32. That is, the portion of the first adapter portion 41 other than the connecting portion 412 is configured as a thickened portion 411.

[0303] The above technical solution can greatly increase the setting range of the thickened part 411, so as to significantly improve the flow capacity of the adapter 40.

[0304] In some embodiments, along the thickness direction Z, the first portion 111 protrudes from the side surface of the second portion 112 facing away from the electrode assembly 30. In other words, along the thickness direction Z, the second portion 112 is closer to the electrode assembly 30 than the first portion 111.

[0305] For example, along the thickness direction Z, the first portion 111 has a first wall 11 surface facing away from the electrode assembly 30 and a second wall surface facing the electrode assembly 30, and the second portion 112 protrudes from the second wall surface in a direction close to the electrode assembly 30. A recessed region is formed on the side of the first wall 11 facing away from the electrode assembly 30, and the recessed region is disposed opposite to the second portion 112 along the thickness direction Z.

[0306] The recessed area can be formed on the first wall 11 by means of grooving, stamping, casting, bending, etc. The first wall 11 can be a one-piece molded structure. For example, the first wall 11 can be a one-piece molded structure formed by one-piece molding methods such as stamping and casting.

[0307] The space formed by the height difference between the first part 111 and the second part 112 in the thickness direction Z helps to reduce the overall volume of the battery cell 7 and increase the energy density of the battery cell 7.

[0308] At least a portion of the electrode terminal 20 is accommodated in the aforementioned recessed region.

[0309] In some examples, along the thickness direction Z, the electrode terminal 20 may protrude from the surface of the second portion 112 away from the electrode assembly 30. Of course, the surface of the electrode terminal 20 away from the electrode assembly 30 may also be flush with the surface of the second portion 112 away from the electrode assembly 30, or the surface of the electrode terminal 20 away from the electrode assembly 30 may be closer to the electrode assembly 30 than the surface of the second portion 112 away from the electrode assembly 30.

[0310] In an embodiment where the battery cell 7 includes two electrode terminals 20, both electrode terminals 20 may be disposed in the second portion 112; or one electrode terminal 20 may be disposed in the second portion 112 and the other electrode terminal 20 may be disposed in the first portion 111.

[0311] By placing the electrode terminal 20 in the second part 112, the electrode terminal 20 can make full use of the space formed by the height difference between the first part 111 and the second part 112 in the thickness direction Z, which is beneficial to reduce the size of the battery cell 7 and increase the energy density of the battery cell 7.

[0312] In some embodiments, along the thickness direction Z, the first portion 111 protrudes from the surface of the electrode terminal 20 away from the electrode assembly 30. That is, there is a height difference between the first portion 111 and the electrode terminal 20 in the thickness direction Z, and the surface of the first portion 111 away from the electrode assembly 30 is further away from the electrode assembly 30 than the surface of the electrode terminal 20 away from the electrode assembly 30.

[0313] By having the first portion 111 protrude from the surface of the electrode terminal 20 away from the electrode assembly 30 along the thickness direction Z, a space is formed between the portion of the first portion 111 that protrudes from the surface of the electrode terminal 20 away from the electrode assembly 30 and the electrode terminal 20. This space can be used to accommodate other structures (such as busbar components) connected to the electrode terminal 20, making it easier to electrically connect the battery cell 7 to other structures, reducing the risk of interference when the battery cell 7 is electrically connected to other structures, and improving the stability of the electrical connection.

[0314] In some embodiments, the first portion 111 and the second portion 112 are disposed along a first direction X, which is perpendicular to the thickness direction Z of the first wall 11. In the same plane perpendicular to the first direction X, the orthographic projection of the electrode terminal 20 at least partially overlaps with the orthographic projection of the tab 32.

[0315] This allows the electrode terminals 20 and tabs 32 to make fuller use of the space formed by the height difference between the first part 111 and the second part 112 in the thickness direction Z, which is beneficial to reducing the size of the battery cell 7 and increasing the energy density of the battery cell 7.

[0316] In some embodiments, there are two first portions 111, which are respectively connected to the two ends of the second portion 112 along the first direction X, and the first direction X is perpendicular to the thickness direction Z of the first wall 11.

[0317] This allows the first recesses 113 corresponding to the two first portions 111 to accommodate two tabs 32 with opposite polarities, and the tabs 32 with opposite polarities are separated by the second portion 112, reducing the risk of short circuit in the battery cell 7 and improving the reliability of the battery cell 7.

[0318] In some embodiments, the second portion 112 is located in the middle region of the first wall 11 along the first direction X. This allows the electrode terminal 20 to be positioned in the middle region of the first wall 11, reducing the risk of the battery cell 7 interfering with other structures during assembly and thus damaging the electrode terminal 20.

[0319] It should be noted that the above embodiments include not only the case where the second part 112 is absolutely located in the middle region of the first wall 11 along the first direction X, but also the case where the second part 112 is generally located in the middle region of the first wall 11 along the first direction X, as is commonly understood in engineering.

[0320] Figure 21 This is a three-dimensional structural diagram of another battery cell provided in some embodiments of this application.

[0321] Continue to refer to Figure 21 In some embodiments, there are two second portions 112, which are respectively connected to the two ends of the first portion 111 along the first direction X, and the first direction X is perpendicular to the thickness direction Z of the first wall 11.

[0322] This allows the electrode terminal 20 to be located in the edge region of the first wall 11, making it easier to electrically connect the battery cell 7 to other structures, reducing the risk of interference when the battery cell 7 is electrically connected to other structures, and improving the stability of the electrical connection.

[0323] In some embodiments, the first portion 111 is located in the middle region of the first wall 11 along the first direction X. It should be noted that the above embodiments include not only the case where the first portion 111 is absolutely located in the middle region of the first wall 11 along the first direction X, but also the case where, as is conventionally understood in engineering, the first portion 111 is approximately located in the middle region of the first wall 11 along the first direction X.

[0324] In some embodiments, the housing 10 includes an end cap 10b and a housing 10a, the housing 10a having an opening, the end cap 10b closing onto the opening, and the end cap 10b being configured as a first wall 11.

[0325] According to some embodiments of this application, this application also provides a battery device including a battery cell 7 of any of the above schemes.

[0326] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 7 or a battery device of any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0327] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0328] To better understand the battery cell 7 provided in the embodiments of this application, based on the same inventive concept, embodiments of the battery cell 7 in practical applications are provided here for illustration.

[0329] This application provides a battery cell 7, which includes a housing 10, electrode terminals 20, an electrode assembly 30, and an adapter 40. The housing 10 includes a first wall 11, which includes a first portion 111 and a second portion 112. The first wall 11 has a first recess 113 at a position corresponding to the first portion 111, and the first recess 113 is recessed relative to the inner surface of the second portion 112. The electrode terminals 20 are disposed in the second portion 112. At least a portion of the electrode assembly 30 is accommodated within the housing 10. The electrode assembly 30 includes an electrode body 31 and tabs 32 extending from the electrode body 31.

[0330] The adapter 40 includes a first adapter portion 41 and a second adapter portion 42. At least a portion of the first adapter portion 41 is accommodated within a first recess 113 and electrically connected to the electrode tab 32. At least a portion of the second adapter portion 42 is disposed between the second portion 112 and the electrode body 31 and electrically connected to the electrode terminal 20. The first adapter portion 41 includes a thickened portion 411, the minimum thickness of which is greater than the maximum thickness of the second adapter portion 42, and at least a portion of the thickened portion 411 is accommodated within the first recess 113.

[0331] The first recess 113 includes a bottom surface 1131 and a first side surface 1132. The first side surface 1132 is connected to one end of the bottom surface 1131 near the second portion 112 and is inclined relative to the bottom surface 1131 in a direction close to the electrode assembly 30. In the same plane perpendicular to the thickness direction Z of the first wall 11, the orthographic projection of the tab 32 is located within the orthographic projection of the bottom surface 1131. In the thickness direction Z, at least a portion of the thickened portion 411 is disposed between the first side surface 1132 and the electrode body 31.

[0332] The thickened portion 411 includes a first thickened portion 411a and a second thickened portion 411b. The second thickened portion 411b is connected to the end of the first thickened portion 411a away from the second transition portion 42. The first thickened portion 411a is bent relative to the second thickened portion 411b in a direction close to the electrode assembly 30. The second transition portion 42 includes a first surface 421 facing the first wall 11 and a second surface 422 facing the electrode body 31. The first thickened portion 411a includes a third surface 50 and a fourth surface 60 disposed opposite to each other. The third surface 50 is connected to the first surface 421, and the fourth surface 60 is connected to the second surface 422.

[0333] The third surface 50 includes a first plane 51, a second plane 52, and a third plane 53. The first plane 51 is inclined relative to the first surface 421 in a direction close to the first wall 11. The third plane 53 connects the second plane 52 and the first surface 421, and the second plane 52 connects the first plane 51 and the third plane 53. The third plane 53 is inclined relative to the first surface 421 in a direction close to the first wall 11. The second plane 52 intersects with the first plane 51 and the third plane 53, and the second plane 52 is parallel to the first surface 421. The fourth surface 60 includes a fourth plane 61, which is inclined relative to the second surface 422 in a direction close to the first wall 11, and the fourth plane 61 is parallel to the first plane 51.

[0334] The above technical solution increases the usable space between the first wall 11 and the electrode assembly 30 by providing a first recess 113 on the first wall 11, and uses the space corresponding to the first recess 113 to provide a thickened part 411 on the adapter 40 to improve the current carrying capacity of the adapter 40, thereby effectively improving the electrical performance of the battery cell 7.

[0335] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0336] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall including a first part and a second part, the inner side of the first part having a first recess, the first recess being recessed relative to the inner surface of the second part; Electrode terminals are disposed in the second part; An electrode assembly, at least partially housed within the housing, the electrode assembly including an electrode body and tabs extending from the electrode body; The adapter includes a first adapter portion and a second adapter portion connected to each other. At least a portion of the first adapter portion is accommodated in the first recess and electrically connected to the electrode tab. At least a portion of the second adapter portion is disposed between the second portion and the electrode body and electrically connected to the electrode terminal. The first adapter includes a thickened portion, the minimum thickness of which is greater than the maximum thickness of the second adapter, and at least a portion of which is accommodated in the first recess.

2. The battery cell according to claim 1, characterized in that, The first adapter further includes a connecting portion, which is connected to the electrode tab, and the thickened portion is connected between the connecting portion and the second adapter; The minimum thickness of the thickened portion is greater than the maximum thickness of the connecting portion.

3. The battery cell according to claim 1 or 2, characterized in that, The first recess includes a bottom surface and a first side surface. The first side surface is connected to one end of the bottom surface near the second portion and is inclined relative to the bottom surface in a direction close to the electrode assembly. In the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the electrode tab is located within the orthographic projection of the bottom surface. In the thickness direction, at least a portion of the thickened portion is disposed between the first side surface and the electrode body.

4. The battery cell according to claim 3, characterized in that, The second adapter includes a first surface facing the first wall and a second surface facing the electrode body; The thickened portion includes a first thickened portion, the first thickened portion including a third surface and a fourth surface disposed opposite to each other, the third surface being connected to the first surface, and the fourth surface being connected to the second surface; The third surface includes a first plane that is inclined relative to the first surface in a direction close to the first wall.

5. The battery cell according to claim 4, characterized in that, The first plane is arranged parallel to the first side surface.

6. The battery cell according to claim 4, characterized in that, The third surface further includes a second plane and a third plane, wherein the third plane is connected between the second plane and the first surface, and the second plane is connected between the first plane and the third plane; The third plane is inclined relative to the first surface in a direction close to the first wall, the second plane intersects the first plane, and the second plane intersects the third plane.

7. The battery cell according to claim 6, characterized in that, The second plane is parallel to the first surface, and / or the first plane is parallel to the third plane.

8. The battery cell according to claim 6, characterized in that, In the thickness direction, the first distance d1 between the second plane and the first surface is 0.5mm-10mm.

9. The battery cell according to claim 8, characterized in that, The first spacing d1 is 1mm-6mm.

10. The battery cell according to claim 6, characterized in that, The first portion and the second portion are disposed along a first direction, which is perpendicular to the thickness direction; In the first direction, the second distance d2 between the third plane and the first plane is 0.5mm-10mm.

11. The battery cell according to claim 10, characterized in that, The second spacing d2 is 1mm-6mm.

12. The battery cell according to claim 4, characterized in that, The fourth surface includes a fourth plane that is inclined relative to the second surface in a direction close to the first wall.

13. The battery cell according to claim 12, characterized in that, The fourth plane is arranged parallel to the first plane.

14. The battery cell according to claim 12, characterized in that, The minimum distance f between the first plane and the fourth plane is 1mm-10mm.

15. The battery cell according to claim 14, characterized in that, The minimum spacing f is 1.5mm-6mm.

16. The battery cell according to claim 12, characterized in that, The fourth surface includes a fifth plane and an arcuate surface. The fifth plane connects the arcuate surface and the second surface, and the arcuate surface connects the fourth plane and the fifth plane. The arcuate surface is curved in a direction away from the third surface.

17. The battery cell according to claim 16, characterized in that, The fifth plane is flush with the second surface.

18. The battery cell according to claim 16, characterized in that, The first surface and the second surface are arranged in parallel. The first angle between the first plane and the first surface is greater than the second angle between the fourth plane and the second surface.

19. The battery cell according to claim 4, characterized in that, The thickened portion further includes a second thickened portion, which is connected to the end of the first thickened portion away from the second adapter portion, and the first thickened portion is bent relative to the second thickened portion in a direction close to the electrode assembly.

20. The battery cell according to claim 19, characterized in that, In the thickness direction, all of the first thickened portion is disposed between the first side surface and the electrode body, and all of the second thickened portion is disposed between the bottom surface and the electrode body.

21. The battery cell according to any one of claims 1-20, characterized in that, The first recess includes a bottom surface and a first side surface. The first side surface is connected to one end of the bottom surface near the second portion and is inclined relative to the bottom surface in a direction close to the electrode assembly. In the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the electrode tab is located within the orthographic projection of the bottom surface. In the thickness direction, at least a portion of the thickened portion is disposed between the bottom surface and the electrode body.

22. The battery cell according to claim 21, characterized in that, The thickened portion includes a second thickened portion, which is disposed between the bottom surface and the electrode body in the thickness direction.

23. The battery cell according to claim 22, characterized in that, A portion of the electrode tab is electrically connected to the second thickened portion.

24. The battery cell according to claim 22, characterized in that, The first dimension h1 of the second thickened portion along the thickness direction is 0.2mm-8mm.

25. The battery cell according to claim 24, characterized in that, The first dimension h1 is 0.5mm-4mm.

26. The battery cell according to any one of claims 1-25, characterized in that, The first adapter also includes a connecting part connected to the thickened part. The connecting part is connected to the tab, and in the same plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tab overlaps with the orthographic projection of the connecting part. The minimum thickness of the thickened portion is greater than the maximum thickness of the connecting portion.

27. The battery cell according to any one of claims 1-26, characterized in that, Along the thickness direction of the first wall, the first portion protrudes from the side surface of the second portion facing away from the electrode assembly.

28. The battery cell according to any one of claims 1-27, characterized in that, The first part and the second part are arranged along a first direction, which is perpendicular to the thickness direction of the first wall; In the same plane perpendicular to the first direction, the orthographic projection of the electrode terminal and the orthographic projection of the tab at least partially overlap.

29. The battery cell according to any one of claims 1-28, characterized in that, The number of the first part is two, and the two first parts are respectively connected to the two ends of the second part along the first direction, which is perpendicular to the thickness direction of the first wall.

30. The battery cell according to any one of claims 1-28, characterized in that, The second part consists of two parts, which are respectively connected to the two ends of the first part along a first direction, which is perpendicular to the thickness direction of the first wall.

31. The battery cell according to any one of claims 1-30, characterized in that, The outer casing includes an end cap and a housing, the housing having an opening, and the end cap closing onto the opening; The end cap is configured as the first wall.

32. A battery device, characterized in that, It includes multiple battery cells as described in any one of claims 1-31.

33. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-31 or a battery device as described in claim 32, wherein the battery cell or the battery device is used to store or provide electrical energy.

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