Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, and the electrode assembly comprises an electrode assembly main body and a tab. The tabs are connected with the electrode assembly main body, the tabs are mutually overlapped, and the widths of every two adjacent tabs are different; wherein the tab is arranged on the target side of the electrode assembly main body, the width direction of the tab is parallel to the target side and perpendicular to the overlapping direction, and the width of the tab is not less than 15mm. According to the structure, the widths of the two adjacent tabs are different, a dislocation space can be provided for the two adjacent tabs, and the space occupied by tab dislocation can be reduced, so that the problem that the internal space of the single battery cannot meet the space required by tab dislocation can be solved.

Description

Technical Field

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

[0002] A battery device includes an electrode assembly, which generally includes an electrode assembly body and an electrode tab. In the manufacturing process of the electrode assembly body with a wound structure, the position of the electrode tab in the electrode plate of the electrode assembly body will change in the horizontal direction, resulting in the misalignment of the electrode tab. Related technologies propose a battery device. In the related technologies, there is a problem that the internal space of the battery cell cannot meet the space required for the misalignment of the electrode tab. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device. The battery cell includes a plurality of overlapping electrode tabs, and the widths of adjacent electrode tabs are different, which can reduce the problem that the internal space of the battery cell cannot meet the space required for the misalignment of the electrode tab.

[0004] To solve the above technical problems, one technical solution adopted by the present application is to provide a battery cell. The battery cell includes an electrode assembly, and the electrode assembly includes an electrode assembly body and an electrode tab. The electrode tab is connected to the electrode assembly body, and a plurality of the electrode tabs overlap each other. Among them, the widths of adjacent electrode tabs are different; among them, the electrode tab is arranged on the target side of the electrode assembly body, the width direction of the electrode tab is parallel to the target side and perpendicular to the overlapping direction, and the width of the electrode tab is not less than 15 millimeters.

[0005] As described above, the different widths of adjacent electrode tabs can provide a misalignment space for adjacent electrode tabs, reduce the space occupied by the misalignment of the electrode tabs, and thus reduce the problem that the internal space of the battery cell cannot meet the space required for the misalignment of the electrode tabs.

[0006] In a possible implementation manner, the electrode tab is in a gradually narrowing shape. The electrode tab includes a bottom edge and a top edge. The bottom edge is located on the electrode assembly body, and in the direction from the bottom edge towards the top edge, the width of the electrode tab gradually decreases.

[0007] As described above, the gradually narrowing electrode tab can improve the structural strength of the electrode tab, make the current density on the electrode tab uniform, and reduce the contact resistance between the electrode tab and the electrode assembly body.

[0008] In a possible implementation manner, the length range of the top edge of the electrode tab is 15 millimeters to 50 millimeters.

[0009] The above electrode tab size can reduce the problem of excessive current density of the electrode tab and also reduce the problem of excessive size of the electrode tab.

[0010] In a possible implementation, the tab forms a side edge, and both ends of the bottom edge are respectively connected to both ends of the top edge through the side edge, and the side edge is arc-shaped.

[0011] As described above, with the side edge being arc-shaped, optimizing the shape of the tab can make the tab structure stronger, and can also make the current gradient change more gently when the current is transferred from the main body of the electrode assembly to the bottom edge and when the current is transferred from the top edge to the adapter plate.

[0012] In a possible implementation, the side edge includes a first arc segment and a second arc segment. The first arc segment connects the second arc segment. The first arc segment connects the top edge, and the second arc segment connects the bottom edge. Wherein, the first arc segment is convexly arranged, and the second arc segment is concavely arranged.

[0013] As described above, with the first arc segment being convex and the second arc segment being concave, the inclination angles at both ends of the side edge are minimized, which can further improve the structural strength of the tab. On the other hand, with the first arc segment being convexly arranged, the inclination angle at the end where the first arc segment connects the top edge is minimized, which can make the current gradient change more gently when the current is transferred from the top edge to the adapter plate; with the second arc segment being concavely arranged, the inclination angle at the end where the second arc segment connects the bottom edge is minimized, which can make the current gradient change more gently when the current is transferred from the main body of the electrode assembly to the tab.

[0014] In a possible implementation, the tangent line of the end of the first arc segment connecting the top edge coincides with the top edge; the tangent line of the end of the second arc segment connecting the bottom edge coincides with the bottom edge.

[0015] As described above, the inclination angle at the end where the side edge connects the top edge is 0 degree, and the inclination angle at the end where the side edge connects the bottom edge is also 0 degree, which can improve the structural strength of the tab, and can also make the current gradient change more gently when the current is transferred from the main body of the electrode assembly to the bottom edge and when the current is transferred from the top edge to the adapter plate.

[0016] In a possible implementation, along the overlapping direction, the length of the top edge and the length of the bottom edge of the next tab are respectively greater than the length of the top edge and the length of the bottom edge of the previous tab.

[0017] As described above, the widths of adjacent tabs change, which can provide a misalignment space.

[0018] In a possible implementation, along the overlapping direction, the side edge of the next tab is the same as the side edge of the previous tab.

[0019] As described above, the side edges of all tabs are arc-shaped, which can make the strength of each tab good and the current gradient change gently.

[0020] In a possible implementation, the side edge includes a third arc segment, one end of the third arc segment is connected to the top edge, and the other end of the third arc segment is connected to the bottom edge; the third arc segment is concave.

[0021] As described above, the side edge is arc-shaped, which can increase the strength of the tab. The inclination angle of the second arc segment at the end connected to the bottom edge is the smallest, which can make the current gradient change more gently when the current is transmitted from the main body of the electrode assembly to the tab.

[0022] In a possible implementation, along the overlapping direction, the bottom edge length of the next tab is greater than the bottom edge length of the previous tab; the top edge length of the next tab is the same as the top edge length of the previous tab.

[0023] As described above, keeping the top edge lengths of the tabs the same can reduce the problem of the tab area being too small and the problem of insufficient tab welding mark area.

[0024] In a possible implementation, along the overlapping direction, the width of the next tab is greater than the width of the previous tab, or the width of the next tab is less than the width of the previous tab.

[0025] As described above, different widths of adjacent tabs can create a misalignment space between each pair of adjacent tabs.

[0026] In a possible implementation, adjacent tabs overlap with each other in a misaligned manner along the width direction. Among them, the two tabs adjacent to a tab are on both sides of this tab and are misaligned in the same direction relative to this tab.

[0027] As described above, it can further reduce the space occupied by tab misalignment.

[0028] To solve the above technical problems, another technical solution adopted by this application is to provide a battery device, and the battery device includes the above-mentioned battery cell.

[0029] For the above battery device, different widths of adjacent tabs can provide a misalignment space for adjacent tabs, reduce the space occupied by tab misalignment, and thus reduce the problem that the internal space of the battery cell cannot meet the space required for tab misalignment.

[0030] To solve the above technical problems, another technical solution adopted by this application is to provide an electrical device. The electrical device includes a battery device, the battery device is the above-mentioned battery device, and the battery device is used to provide electrical energy.

[0031] For the above-mentioned electrical device, the widths of adjacent tab ears are different, which can provide a misalignment space for adjacent tab ears, reduce the space occupied by tab ear misalignment, and thus reduce the problem that the internal space of the battery cell cannot meet the space required for tab ear misalignment.

[0032] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. In order to make the above content, other purposes, features, and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically given below. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of this application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of a vehicle according to one or more embodiments of this application;

[0035] Figure 2 It is a schematic structural diagram of a battery cell according to one or more embodiments of this application;

[0036] Figure 3 It is a schematic structural diagram of an electrode assembly from a first perspective according to one or more embodiments of this application;

[0037] Figure 4 It is a schematic structural diagram of an electrode assembly from a second perspective according to one or more embodiments of this application;

[0038] Figure 5 It is a schematic structural diagram of an electrode assembly from a third perspective according to one or more embodiments of this application;

[0039] Figure 6 It is a schematic structural diagram of a tab ear according to one or more embodiments of this application;

[0040] Figure 7 It is a schematic structural diagram of a tab ear according to another one or more embodiments of this application;

[0041] Figure 8 It is a schematic overlapping structure diagram of tab ears according to yet another one or more embodiments of this application.

[0042] Among them, 1000 is a vehicle; 200 is a controller; 300 is a motor; 100 is a battery device; 110 is a battery cell; 10 is an electrode assembly; 11 is a main body of the electrode assembly; 12 is an electrode tab; 121 is a top edge; 122 is a bottom edge; 123 is a side edge; 1231 is a first arc segment; 1232 is a second arc segment; 1233 is a third arc segment. Detailed implementation manners

[0043] Hereinafter, embodiments of the technical solution of the present application will be described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise specifically defined, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0046] Referring to "embodiments" herein means that a specific feature, structure or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0048] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0050] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydraulic, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0051] Among them, the battery device includes an electrode assembly, and the electrode assembly usually includes an electrode assembly main body and a tab. In the manufacturing process of the electrode assembly main body with a roll structure, the position of the tab in the electrode plate of the electrode assembly main body will change in the horizontal direction, which will cause the tab to be misaligned. The related art proposes a battery device. In the related art, the battery device has the problem that the internal space of the battery cell cannot meet the space required for the tab misalignment.

[0052] Based on the above considerations, in order to solve the technical problem of insufficient space required for tab misalignment in the prior art, the present application proposes a battery cell, a battery device, and an electrical device. The tabs of the battery cell overlap, and the widths of adjacent tabs are different, which can reduce the problem that the internal space of the battery cell cannot meet the space required for tab misalignment.

[0053] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application.

[0054] Please refer to Figure 1 , Figure 1Schematic structural diagram of a vehicle according to one or more embodiments of the present application.

[0055] Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside vehicle 1000. The battery device 100 can be disposed at the bottom, the head, or the tail of vehicle 1000. The battery device 100 can be used to supply power to vehicle 1000. For example, the battery device 100 can serve as the operating power source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start-up, navigation, and driving of vehicle 1000.

[0056] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of vehicle 1000, but also serve as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0057] To improve the performance of the electrical device, the present application provides a battery cell, a battery device, and an electrical device. Please refer to Figure 2 and Figure 3 , Figure 2 Schematic structural diagram of a battery cell according to one or more embodiments of the present application; Figure 3 Schematic structural diagram of an electrode assembly from a first perspective according to one or more embodiments of the present application.

[0058] In some embodiments, the battery cell 110 includes an electrode assembly 10. The electrode assembly 10 includes an electrode assembly main body 11 and a plurality of tabs 12. The tabs 12 are connected to the electrode assembly main body 11, and the plurality of tabs 12 overlap each other. Among them, the widths of two adjacent tabs 12 are different. Among them, the tabs 12 are disposed on the target side of the electrode assembly main body 11. The width direction of the tabs 12 is parallel to the target side and perpendicular to the overlapping direction. The width of the tabs 12 is not less than 15 millimeters.

[0059] The battery cell 110 further includes a housing (not shown in the figure), and the electrode assembly 10 is specifically disposed within the housing. The housing forms a receiving space (not shown in the figure), and the receiving space is used to receive the electrode assembly 10 and the electrolyte to provide a sealed and insulated environment and also serve a protective function. The material of the housing is copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. Among them, the number of the electrode assemblies 10 can be one or more. In this embodiment, the electrode assembly body 11 of the electrode assembly 10 is a wound structure electrode assembly body 11, and the wound structure electrode assembly body 11 is formed by winding electrode sheets (not labeled). The electrode sheets are divided into positive electrode sheets and negative electrode sheets, and generally a separator (not shown in the figure) is provided between the positive electrode sheet and the negative electrode sheet. Among them, during the manufacturing process of the wound structure electrode assembly body 11, the position of the tab 12 of the electrode assembly body 11 will change in the horizontal direction. Related technologies have proposed a battery cell 110. In the related technologies, the widths of the tabs 12 are the same, and adjacent tabs 12 are offset from each other in the same direction in pairs. When the number of tabs 12 is relatively large, the total offset space occupied by all the tabs 12 is relatively large, and the internal space of the battery cell 110 cannot meet the space required for the offset of the tabs 12. In this embodiment, the widths of adjacent tabs 12 are different, which can provide an offset space for adjacent tabs 12. In addition, not only is there an offset space between the tabs 12, but also the total space occupied by all the tabs 12 can be reduced, and the problem that the internal space of the battery cell 110 cannot meet the space required for the offset of the tabs 12 can be reduced. In addition, the tab 12 includes a positive tab 12 and a negative tab 12. In this embodiment, multiple positive tabs 12 overlap each other, and the widths of adjacent positive tabs 12 are different. In some other embodiments, multiple negative tabs 12 can also overlap each other, and the widths of adjacent negative tabs 12 are different. In some other embodiments, multiple positive tabs 12 can also overlap each other, and the widths of adjacent positive tabs 12 are different; in addition, multiple negative tabs 12 overlap each other, and the widths of adjacent negative tabs 12 are different. The width of each tab is not less than 15 mm to reduce the problem of excessive current density of the tab. Among them, the width of the tab can specifically be 15 mm, 16 mm, 20 mm, 25 mm, etc.

[0060] As described above, the different widths of adjacent tabs 12 can provide an offset space for adjacent tabs 12, and can reduce the space occupied by the offset of the tabs 12, thereby reducing the problem that the internal space of the battery cell 110 cannot meet the space required for the offset of the tabs 12.

[0061] Please refer to Figure 4 and Figure 5 , Figure 4 which is a schematic structural diagram of a second perspective of an electrode assembly according to one or more embodiments of the present application; Figure 5It is a schematic structural diagram of a third perspective of an electrode assembly according to one or more embodiments of the present application. In some embodiments, along the overlapping direction, the width of the next tab 12 is greater than the width of the previous tab 12.

[0062] Any two adjacent tabs 12 overlap each other and have different widths. In this embodiment, there is a dislocation setting on both sides of the two adjacent tabs 12 in the width direction, and the tab 12 with a smaller width is dislocated inward relative to the tab 12 with a larger width on both sides in the width direction. In some other embodiments, it is also possible that two adjacent tabs 12 coincide on one side in the width direction and are dislocated on the other side in the width direction. Additionally, in this embodiment, the width difference between any two adjacent tabs is the same. In some other embodiments, the width difference between any two adjacent tabs can also be different. In this embodiment, the width difference between two adjacent tabs 12 is 1 millimeter. In some other embodiments, the width difference between two adjacent tabs 12 can also be reasonable values such as 1.5 millimeters, 2 millimeters, etc. Additionally, in this embodiment, along the overlapping direction, the width of the next tab 12 is greater than the width of the previous tab 12. In some other embodiments, along the overlapping direction, the width of the next tab 12 can be greater than the width of the previous tab 12, or the width of the next tab 12 can be less than the width of the previous tab 12. That is, the tabs 12 do not need to overlap with their widths increasing or decreasing in sequence, and only the widths of two adjacent tabs 12 need to be different. In some other embodiments, please refer to Figure 8 , Figure 8 It is a schematic diagram of the overlapping structure of tabs according to one or more other embodiments of the present application. The adjacent tabs 12 overlap by being dislocated in the width direction. Among them, the two tabs 12 adjacent to a tab 12 are dislocated in the same direction relative to this tab 12 on both sides of this tab 12.

[0063] As described above, the progressive change in the width of the tab 12 can make there be a dislocation space between any two adjacent tabs 12.

[0064] Please refer to Figure 6 , Figure 6 It is a schematic diagram of the structure of a tab according to one or more embodiments of the present application. In some embodiments, the tab 12 is in a gradually converging shape. The tab 12 includes a bottom edge 122 and a top edge 121. The bottom edge 122 is located on the main body 11 of the electrode assembly. In the direction from the bottom edge 122 towards the top edge 121, the width of the tab 12 gradually decreases.

[0065] The tab 12 is in a gradually narrowing shape. The width of the tab 12 on the side connected to the main body 11 of the electrode assembly is the largest, and the width of the tab 12 on the side away from the main body 11 of the electrode assembly is the smallest. The tab 12 with this shape has better structural strength, and the connection area between the tab 12 and the main body 11 of the electrode assembly is larger, which can reduce the contact resistance and make the current density on the tab 12 more uniform. Additionally, the tab 12 can specifically be an isosceles trapezoid shape, a right trapezoid shape, or other reasonable gradually narrowing shapes. In some other embodiments, the tab 12 may not be in a gradually narrowing shape, and the tab 12 can specifically also be a rectangular shape.

[0066] As described above, the tab 12 in a gradually narrowing shape can improve the structural strength of the tab 12, make the current density on the tab 12 more uniform, and reduce the contact resistance between the tab 12 and the main body 11 of the electrode assembly.

[0067] In some embodiments, the length range of the top side 121 of the tab 12 is from 15 millimeters to 50 millimeters.

[0068] In some embodiments, the length range of the bottom side 122 of the tab 12 is also from 15 millimeters to 50 millimeters, and the length of the bottom side 122 of the tab 12 is greater than the length of the top side 121 of the tab 12. Among them, the length of the top side 121 of the tab 12 can specifically be values such as 15 millimeters, 20 millimeters, 30 millimeters, 40 millimeters, 50 millimeters, etc.

[0069] The above dimensions of the tab 12 can reduce the problem of excessive current density of the tab 12 and also reduce the problem of excessive size of the tab 12.

[0070] In some embodiments, the tab 12 is formed with side edges 123. Both ends of the bottom side 122 are respectively connected to both ends of the top side 121 through the side edges 123, and the side edges 123 are in an arc shape.

[0071] The tab 12 has two side edges 123 located on two opposite sides. In this embodiment, both side edges 123 are in an arc shape, and the shapes and sizes of both side edges 123 are the same. In some other embodiments, the shapes and sizes of both side edges 123 may also be different. Additionally, the arc shape of the side edges 123 can be concave or convex. In some other embodiments, one side edge 123 of the tab 12 can be arc-shaped, and the other side edge 123 of the tab 12 can be non-arc-shaped. The side edges 123 of the tab 12 being in an arc shape can reduce the stress concentration of the tab 12 and make the structural strength of the tab 12 higher.

[0072] As described above, the side edges 123 being in an arc shape can optimize the shape of the tab 12, make the structural strength of the tab 12 higher, and also make the current gradient change more gently when the current is transferred from the main body 11 of the electrode assembly to the bottom side 122 and when the current is transferred from the top side 121 to the adapter piece.

[0073] In some embodiments, the side edge 123 includes a first arc segment 1231 and a second arc segment 1232. The first arc segment 1231 is connected to the second arc segment 1232. The first arc segment 1231 is connected to the top edge 121, and the second arc segment 1232 is connected to the bottom edge 122. Among them, the first arc segment 1231 is convexly arranged, and the second arc segment 1232 is concavely arranged.

[0074] The first arc segment 1231 is convexly arranged, so that in the direction of approaching the top edge 121, the inclination angle of the first arc segment 1231 gradually decreases. When the current is transmitted from the top edge 121 to the adapter piece, the change of the current gradient is smoother. In addition, it can make the top of the tab 12 smooth and improve the structural strength of the tab 12. Similarly, the second arc segment 1232 is concavely arranged, so that in the direction of approaching the bottom edge 122, the inclination angle of the second arc segment 1232 gradually decreases. When the current is transmitted from the main body 11 of the electrode assembly to the tab 12, the change of the current gradient is smoother. In addition, it can make the bottom of the tab 12 smooth and improve the structural strength of the tab 12.

[0075] As described above, the first arc segment 1231 is convex and the second arc segment 1232 is concave, so that the inclination angles at both ends of the side edge 123 are the smallest, which can further improve the structural strength of the tab 12. On the other hand, the first arc segment 1231 is convexly arranged, and the inclination angle at the end of the first arc segment 1231 connected to the top edge 121 is the smallest, which can make the change of the current gradient smoother when the current is transmitted from the top edge 121 to the adapter piece; the second arc segment 1232 is concavely arranged, and the inclination angle at the end of the second arc segment 1232 connected to the bottom edge 122 is the smallest, which can make the change of the current gradient smoother when the current is transmitted from the main body 11 of the electrode assembly to the tab 12.

[0076] In some embodiments, the tangent line of the end of the first arc segment 1231 connected to the top edge 121 coincides with the top edge 121; the tangent line of the end of the second arc segment 1232 connected to the bottom edge 122 coincides with the bottom edge 122.

[0077] The inclination angle of the first arc segment 1231 gradually decreases in the direction towards the top edge 121. In this embodiment, the tangent line of the first arc segment 1231 at the end connected to the top edge 121 coincides with the top edge 121, that is, the inclination angle of the first arc segment 1231 at the end connected to the top edge 121 is 0 degrees, which can make the top of the tab 12 smooth, improve the structural strength of the tab 12, and at the same time make the current gradient change more gently when the current is transmitted from the tab 12 to the adapter plate. In some other embodiments, the inclination angle of the first arc segment 1231 in the direction towards the top edge 121 can also be 5 degrees, 10 degrees, 15 degrees and other reasonable degrees. Similarly, the tangent line of the second arc segment 1232 at the end connected to the bottom edge 122 coincides with the bottom edge 122, and the inclination angle of the second arc segment 1232 at the end connected to the bottom edge 122 is 0, which can make the bottom of the tab 12 smooth, improve the structural strength of the tab 12, and at the same time make the current gradient change more gently when the current is transmitted from the main body 11 of the electrode assembly to the tab 12. In some other embodiments, the inclination angle of the second arc segment 1232 in the direction towards the bottom edge 122 can also be 5 degrees, 10 degrees, 15 degrees and other reasonable degrees.

[0078] As described above, the inclination angle of the end of the side edge 123 connected to the top edge 121 is 0, and the inclination angle of the end of the side edge 123 connected to the bottom edge 122 is also 0 degrees, which can improve the structural strength of the tab 12 and also make the current gradient change more gently when the current is transmitted from the main body 11 of the electrode assembly to the bottom edge 122 and when the current is transmitted from the top edge 121 to the adapter plate.

[0079] In some embodiments, along the overlapping direction, the length of the top edge 121 and the length of the bottom edge 122 of the next tab 12 are respectively greater than the length of the top edge 121 and the length of the bottom edge 122 of the previous tab 12.

[0080] In this embodiment, the length of the top edge 121 of the next tab 12 is greater than the length of the top edge 121 of the previous tab 12, the length of the bottom edge 122 of the next tab 12 is greater than the length of the bottom edge 122 of the previous tab 12, and the difference in the length of the top edge 121 between two adjacent tabs 12 is the same as the difference in the length of the bottom edge 122, and the difference in the length of the top edge 121 and the difference in the length of the bottom edge 122 can be 1 mm, 2 mm, 3 mm, etc. In some other embodiments, the difference in the length of the top edge 121 between two adjacent tabs 12 and the difference in the length of the bottom edge 122 may not be the same. When the difference in the length of the top edge 121 between two adjacent tabs 12 and the difference in the length of the bottom edge 122 are not the same, the shapes of the two adjacent tabs 12 are not the same.

[0081] As described above, the width change of two adjacent tabs 12 can provide a misalignment space.

[0082] In some embodiments, along the overlapping direction, the side edge 123 of the next tab 12 is the same as the side edge 123 of the previous tab 12.

[0083] The side 123 of the next tab 12 is the same as the side 123 of the previous tab 12, that is, the shape and size of the side 123 are the same. This setting makes the tabs 12 only different in width, and the height of each tab 12 is the same, so as to facilitate the stacking of the tabs 12.

[0084] As described above, the side 123 of each tab 12 is arc-shaped, which can make each tab 12 have good strength and a gentle change in current gradient.

[0085] Please refer to Figure 7 , Figure 7 It is a schematic structural diagram of a tab according to another embodiment or multiple embodiments of the present application. In some embodiments, the side 123 includes a third arc segment 1233. One end of the third arc segment 1233 is connected to the top edge 121, and the other end of the third arc segment 1233 is connected to the bottom edge 122; the third arc segment 1233 is concave.

[0086] In this embodiment, the length of the bottom edge 122 is greater than the length of the top edge 121. The third arc segment 1233 is concave, and the inclination angle at the end where the third arc segment 1233 is connected to the bottom edge 122 is the smallest, which can make the bottom of the tab 12 smooth, improve the structural strength of the tab 12, and at the same time make the change in current gradient more gentle when the current is transferred from the main body 11 of the electrode assembly to the tab 12. In some other embodiments, the third arc segment 1233 can also be convex.

[0087] As described above, the side 123 is arc-shaped, which can increase the strength of the tab 12. The inclination angle at the end where the second arc segment 1232 is connected to the bottom edge 122 is the smallest, which can make the change in current gradient more gentle when the current is transferred from the main body 11 of the electrode assembly to the tab 12.

[0088] In some embodiments, along the overlapping direction, the length of the bottom edge 122 of the next tab 12 is greater than the length of the bottom edge 122 of the previous tab 12; the length of the top edge 121 of the next tab 12 is the same as the length of the top edge 121 of the previous tab 12.

[0089] In this embodiment, the tabs 12 are only different in the length of the bottom edge 122, and the length of the top edge 121 of each tab 12 is the same. This setting can also provide a misalignment space for the tabs 12. Among them, in some other embodiments, the length of the bottom edge 122 of the next tab 12 can also be greater than or less than the length of the bottom edge 122 of the previous tab 12, and the length of the top edge 121 of the next tab 12 is the same as the length of the top edge 121 of the previous tab 12. In addition, keeping the length of the top edge 121 of the tab 12 unchanged and only adjusting the length of the bottom edge 122 of the tab 12 can reduce the area change of the tab 12, reduce the problem of the tab 12 having too small an area, and reduce the problem of insufficient welding mark area of the tab 12.

[0090] As described above, the adjacent two tab ears 12 have different widths, which can provide a dislocation space for the adjacent two tab ears 12. On the other hand, the tab ears 12 overlap with each other, which can reduce the space occupied by the dislocation of the tab ears 12, thereby reducing the problem that the internal space of the battery cell 110 cannot meet the space required for the dislocation of the tab ears 12.

[0091] Correspondingly, the present application also provides a battery device 100. The battery device 100 includes the above-mentioned battery cell 110.

[0092] In the above-mentioned battery device 100, the adjacent two tab ears 12 have different widths, which can provide a dislocation space for the adjacent two tab ears 12 and can reduce the space occupied by the dislocation of the tab ears 12, thereby reducing the problem that the internal space of the battery cell 110 cannot meet the space required for the dislocation of the tab ears 12.

[0093] Correspondingly, the present application also provides an electrical device. The electrical device includes the battery device 100. The battery device 100 is the battery device 100 in any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0094] In the above-mentioned electrical device, the adjacent two tab ears 12 have different widths, which can provide a dislocation space for the adjacent two tab ears 12. On the other hand, the tab ears 12 overlap with each other, which can reduce the space occupied by the dislocation of the tab ears 12, thereby reducing the problem that the internal space of the battery cell 110 cannot meet the space required for the dislocation of the tab ears 12.

[0095] Finally, in a specific application scenario, there is a problem that the internal space of the battery cell 110 in the existing battery device 100 cannot meet the space required for the misalignment of the tabs 12. The battery cell 110 of the present application includes an electrode assembly 10, and the electrode assembly 10 includes an electrode assembly main body 11 and a plurality of tabs 12. The tabs 12 are connected to the electrode assembly main body 11, and the plurality of tabs 12 overlap each other. Among them, the widths of adjacent tabs 12 are different; wherein, the tabs 12 are arranged on the target side of the electrode assembly main body 11, the width direction of the tabs 12 is parallel to the target side and perpendicular to the overlapping direction, and the width of the tabs 12 is not less than 15 mm. The tabs 12 are in a gradually converging shape, the tabs 12 include a bottom edge 122 and a top edge 121, the bottom edge 122 is located on the electrode assembly main body 11, and in the direction from the bottom edge 122 towards the top edge 121, the width of the tabs 12 gradually decreases. The length range of the top edge 121 of the tabs 12 is 15 mm to 50 mm. The tabs 12 are formed with side edges 123, and both ends of the bottom edge 122 are respectively connected to both ends of the top edge 121 through the side edges 123, and the side edges 123 are arc-shaped. The side edge 123 includes a third arc segment 1233, one end of the third arc segment 1233 is connected to the top edge 121, and the other end of the third arc segment 1233 is connected to the bottom edge 122; the third arc segment 1233 is concave. Along the overlapping direction, the length of the bottom edge 122 of the next tab 12 is greater than the length of the bottom edge 122 of the previous tab 12; the length of the top edge 121 of the next tab 12 is the same as the length of the top edge 121 of the previous tab 12.

[0096] In the above manner, the widths of adjacent tabs 12 are different, which can provide misalignment space for adjacent tabs 12, reduce the space occupied by the misalignment of the tabs 12, and thus reduce the problem that the internal space of the battery cell 110 cannot meet the space required for the misalignment of the tabs 12.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: The battery cell includes an electrode assembly, and the electrode assembly includes: An electrode assembly body; A plurality of pole tabs, wherein the pole tabs are connected to the electrode assembly body, the plurality of pole tabs overlap each other, and the widths of two adjacent pole tabs are different; Wherein, the pole ear is arranged on the target side of the electrode assembly body, the width direction of the pole ear is parallel to the target side and perpendicular to the overlapping direction, and the width of the pole ear is not less than 15 mm.

2. The battery cell according to claim 1, characterized in that: The pole ear is tapered and includes a bottom edge and a top edge. The bottom edge is located on the electrode assembly body. In the direction from the bottom edge to the top edge, the width of the pole ear gradually decreases.

3. The battery cell according to claim 2, characterized in that: The length of the top edge of the pole ear ranges from 15 mm to 50 mm.

4. The battery cell according to claim 2, characterized in that: The pole ear is formed with a side edge, and two ends of the bottom edge are respectively connected to two ends of the top edge through the side edge, and the side edge is in an arc shape.

5. The battery cell according to claim 4, characterized in that: The side edge includes a first arc segment and a second arc segment, the first arc segment is connected to the second arc segment, the first arc segment is connected to the top edge, and the second arc segment is connected to the bottom edge; Wherein, the first arc segment is convexly arranged, and the second arc segment is concavely arranged.

6. The battery cell according to claim 5, characterized in that: A tangent line of the first arc segment connecting one end of the top edge coincides with the top edge; a tangent line of the second arc segment connecting one end of the bottom edge coincides with the bottom edge.

7. The battery cell according to claim 6, characterized in that: Along the overlapping direction, the top side length and the bottom side length of the next pole lug are respectively greater than the top side length and the bottom side length of the previous pole lug.

8. The battery cell according to claim 4, characterized in that: Along the overlapping direction, the side edge of the next pole lug is the same as the side edge of the previous pole lug.

9. The battery cell according to claim 4, characterized in that: The side edge comprises a third arc segment, one end of the third arc segment is connected to the top edge, and the other end of the third arc segment is connected to the bottom edge; the third arc segment is concavely arranged.

10. The battery cell according to claim 9, characterized in that: Along the overlapping direction, the length of the bottom side of the next pole lug is greater than the length of the bottom side of the previous pole lug; the length of the top side of the next pole lug is the same as the length of the top side of the previous pole lug.

11. The battery cell according to claim 1, characterized in that: Along the overlapping direction, the width of the next pole lug is greater than the width of the previous pole lug, or the width of the next pole lug is less than the width of the previous pole lug.

12. The battery cell according to claim 1, characterized in that: The adjacent pole tabs are overlapped and offset along the width direction, wherein the two pole tabs adjacent to one pole tab are offset along the same direction relative to the pole tab on both sides of the pole tab.

13. A battery device, characterized in that: The battery device comprises the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The electrical device comprises the battery device according to claim 13, and the battery device is used to provide electrical energy.

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