Battery cell, battery device and electric device
By setting overlapping reinforcing ribs on the electrode body, the problem of easy wrinkling and bending of the electrode during processing is solved, thereby improving the stability and energy efficiency of the battery cell.
Patent Information
- Application Number
- CN202422880287.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In the prior art, the tabs of battery cells are prone to wrinkling and bending during the transmission roller or smoothing roller process, which leads to increased internal resistance and affects the reliability and performance of the battery cells.
A first reinforcing rib and a second reinforcing rib are provided on the electrode body with at least partial overlap of projections, and the first reinforcing rib and the second reinforcing rib have different shapes. At least a portion of the second reinforcing rib protrudes from the side away from the electrode body relative to the first reinforcing rib, so as to enhance the stability of the electrode and the current conduction area.
It improves the stability and current conduction area of the tabs, enhances the energy efficiency and reliability of the battery cells, and reduces the risk of tab deformation.
Smart Images
Figure CN223771291U_ABST
Abstract
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] In recent years, with the rapid development of new energy technologies, new energy vehicles have been increasingly widely used and are gradually replacing traditional fuel vehicles, becoming one of the mainstream modes of transportation. As the power source of new energy vehicles, the power battery is one of their core components; therefore, the safety performance of the power battery has become a key focus of attention.
[0003] In the development of battery technology, improving the stability of the tabs of individual battery cells is a research direction. Utility Model Content
[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.
[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a housing and an electrode assembly. The electrode assembly is disposed inside the housing and includes a main body and a tab extending from the end of the main body. The tab includes a tab body and a reinforcing structure disposed on the tab body. The reinforcing structure includes a first reinforcing rib and a second reinforcing rib with different shapes. Along the thickness direction of the tab body, the projection of the first reinforcing rib and the projection of the second reinforcing rib at least partially overlap. At least a portion of the second reinforcing rib protrudes from the side opposite to the tab body relative to the first reinforcing rib.
[0006] In the above solution, by setting a first reinforcing rib and a second reinforcing rib that at least partially overlap in projection on the electrode body, and the first reinforcing rib and the second reinforcing rib have different shapes, the electrode can resist forces from more directions, resulting in greater stability. Furthermore, by setting at least a portion of the second reinforcing rib to protrude relative to the first reinforcing rib towards the side opposite to the electrode body, the stability of the electrode can be further improved, and the current conduction area of the electrode can be increased, thereby improving the energy efficiency of the battery cell and enhancing the reliability of the battery.
[0007] In some embodiments, the projection of the second reinforcing rib is located within the projection range of the first reinforcing rib along the thickness direction of the tab body.
[0008] In the above scheme, by setting the second reinforcing rib within the range of the first reinforcing rib, the number and density of reinforcing ribs can be increased, thereby further improving the stability of the electrode tab.
[0009] In some embodiments, the first reinforcing rib extends along a first direction, and a plurality of spaced second reinforcing ribs are spaced apart along the first direction.
[0010] In the above scheme, by extending the first reinforcing rib along the first direction, the first reinforcing rib can resist the force from other directions intersecting the first direction; by arranging multiple spaced second reinforcing ribs at intervals along the first direction, the second reinforcing ribs can resist the force from the first direction, thereby enabling the electrode tab to resist the force from all directions, ensuring that the electrode tab will not deform to a certain extent, thereby improving the stability of the electrode tab.
[0011] In some embodiments, a plurality of first reinforcing ribs are spaced apart along a second direction, and the first direction and the second direction are intersecting.
[0012] In the above scheme, multiple first reinforcing ribs are spaced apart along the second direction, which can not only further improve the stability of the electrode tab, but also allow the same rod to be used to press and obtain a reinforced structure.
[0013] In some embodiments, a plurality of second reinforcing ribs are staggered along a second direction.
[0014] In the above scheme, by staggering multiple second reinforcing ribs along the second direction, the staggered second reinforcing ribs can resist more forces along the second direction, and to a certain extent prevent the electrode lug from bending and deforming along the second direction.
[0015] In some embodiments, the width of the second reinforcing rib along the second direction is L1, and the width of the first reinforcing rib along the second direction is L2, wherein L1 and L2 satisfy: 0.1≤L1 / L2<1.
[0016] In the above scheme, by setting L1 / L2 within a suitable range, both the density of the reinforcing ribs and the stability of the tabs can be taken into account.
[0017] In some embodiments, L1 and L2 satisfy: 0.8 ≤ L1 / L2 < 1.
[0018] In the above scheme, by further limiting the range of L1 / L2 and increasing the width of the second reinforcing rib, the ability of the second reinforcing rib to resist forces from multiple directions is improved.
[0019] In some embodiments, the reinforcing structure further includes a third reinforcing rib, which is spaced apart along the first direction and has a different shape from the second reinforcing rib.
[0020] In the above scheme, by adding a third reinforcing rib of different shapes, the electrode can be further made to resist forces from more directions, resulting in greater stability.
[0021] In some embodiments, the projection of the third reinforcing rib is within the projection range of the first reinforcing rib along the thickness direction of the tab body.
[0022] In the above scheme, by setting the third reinforcing rib within the range of the first reinforcing rib, a larger number of third reinforcing ribs can be set without occupying the space of the welding position of the electrode lug, thus improving space utilization.
[0023] In some embodiments, the second reinforcing rib and the third reinforcing rib are alternately arranged along the first direction.
[0024] In the above scheme, by alternately setting the second and third reinforcing ribs along the first direction, the strength of the electrode tab can be enhanced, and the risk of electrode tab deformation can be further reduced.
[0025] In some embodiments, the area of the first reinforcing rib is S1, the area of the second reinforcing rib is S2, and S1 and S2 satisfy: 1≤S1 / S2≤10.
[0026] In the above scheme, by limiting S1 / S2 within a suitable range, the functions of the first reinforcing rib and the second reinforcing rib can be taken into account, so that the electrode tab can resist the forces in all directions in a more balanced way.
[0027] In some embodiments, S1 and S2 satisfy: 1.2≤S1 / S2≤2.
[0028] In the above scheme, by further limiting the range of S1 / S2, the electrode can be made to resist the forces in all directions more evenly, thereby reducing the deformation of the electrode at various positions.
[0029] In some embodiments, the electrode includes a first side and a second side disposed opposite to each other, the first side being closer to the main body than the second side, and the width of the first side being greater than the width of the second side.
[0030] In the above solution, by setting the width of the first side of the electrode close to the main body to be greater than the width of the second side, the flow area at the connection between the electrode and the main body can be increased, thereby improving the flow capacity and safety at this point.
[0031] In some embodiments, at least one first reinforcing rib extends to the first side and the second side at both ends, which can increase the extension length of the first reinforcing rib, thereby reducing the risk of the tab bending.
[0032] In some embodiments, the electrode tab further includes two third sides disposed opposite to each other, the two ends of the third sides being connected to the first side and the second side respectively, and the two ends of at least one first reinforcing rib extending to the first side and the third side.
[0033] In the above scheme, the third side is a slope. By extending at least one first reinforcing rib to the third side, the space near the third side can also be equipped with a first reinforcing rib, thereby strengthening the strength at this point.
[0034] Secondly, embodiments of this application also provide a battery device, including a battery cell of any of the above embodiments.
[0035] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy.
[0036] 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
[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0038] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;
[0039] Figure 2 Exploded views of battery devices according to some embodiments of this application;
[0040] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application;
[0041] Figure 4 This is an exploded structural diagram of a battery cell according to some embodiments of this application;
[0042] Figure 5 These are schematic diagrams of the electrode tabs in some embodiments of this application;
[0043] Figure 6 This is a partial side view of the tabs in some embodiments of this application;
[0044] Figure 7 These are schematic diagrams of the electrode tabs in other embodiments of this application;
[0045] Figure 8 This is a partial schematic diagram of the reinforcing structure of some embodiments of this application;
[0046] Figure 9 This is a schematic diagram of the electrode tab structure of some embodiments of this application;
[0047] Figure 10 This is a schematic diagram of the tab structure in some embodiments of this application.
[0048] Explanation of reference numerals in the attached figures:
[0049] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; 10, Top cover; 30, Housing; 400, Battery module; 20, Battery cell; 22, Housing; 21, End cap; 23, Electrode assembly; 24, Outer shell; 26, Electrode terminal; 25, Main body; 40, Tab; 41, Tab body; 42, Reinforcing structure; 421, First reinforcing rib; 422, Second reinforcing rib; 423, Third reinforcing rib; 43, First side; 44, Second side; 45, Third side; X, First direction; Y, Second direction; Z, Thickness direction. Detailed Implementation
[0050] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.
[0051] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.
[0052] In this application, the reference to "embodiment" means that a specific 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 throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.
[0053] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0054] 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. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited thereto.
[0055] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.
[0056] 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, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.
[0057] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.
[0058] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.
[0059] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.
[0060] This application provides an electrical device that uses a battery as a power source. The electrical device 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.
[0061] During the manufacturing process of electrode components, the tabs pass through many transmission rollers, smoothing rollers, belts and other structures, which can easily lead to phenomena such as tab wrinkles and bends, affecting the subsequent stacking and welding of electrode sheets, and may even increase internal resistance, resulting in a decrease in the performance of the battery cell and thus reducing the reliability of the battery cell.
[0062] To address the aforementioned technical problems, this application provides a battery cell that, by providing at least partially overlapping first and second reinforcing ribs on the tab body, with the first and second reinforcing ribs having different shapes, enables the tab to withstand forces from more directions, resulting in greater stability. Furthermore, by having at least a portion of the second reinforcing ribs protrude relative to the first reinforcing ribs towards the side opposite to the tab body, the stability of the tab can be further improved, and the current conduction area of the tab can be increased, thereby improving the energy efficiency of the battery cell and enhancing battery reliability.
[0063] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.
[0064] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.
[0065] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
[0066] Please refer to Figure 2 , Figure 2This is an exploded view of the apparatus provided in some embodiments of this application. The battery device 100 includes a battery housing and battery cells 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and housing 30 covering each other, and the top cover 10 and housing 30 together defining a receiving cavity for receiving the battery cells 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and housing 30 together define the receiving cavity; the top cover 10 and housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.
[0067] Figure 3 This is a schematic diagram of the structure of a battery module according to some embodiments of this application. In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in a housing. Of course, the battery device 100 can also be in the form of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module 400, and then multiple battery modules 400 are connected in series, parallel, or in a mixed manner to form a whole and housed in a housing. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.
[0068] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.
[0069] Please refer to Figure 4 , Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.
[0070] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on end cap 21. Electrode terminals 26 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.
[0071] Figure 5 These are schematic diagrams of the electrode tabs in some embodiments of this application; Figure 6 This is a partial side view of the tabs in some embodiments of this application.
[0072] Please refer to the following: Figure 5 and Figure 6 In a first aspect, embodiments of this application provide a battery cell 20, which includes a housing 24 and an electrode assembly 23. The electrode assembly 23 is disposed inside the housing 24 and includes a main body 25 and a tab 40 extending from the end of the main body 25. The tab 40 includes a tab body 41 and a reinforcing structure 42 disposed on the tab body 41. The reinforcing structure 42 includes a first reinforcing rib 421 and a second reinforcing rib 422 with different shapes. Along the thickness direction of the tab body 41, the projection of the first reinforcing rib 421 and the projection of the second reinforcing rib 422 at least partially overlap. At least a portion of the second reinforcing rib 422 protrudes from the first reinforcing rib 421 to the side away from the tab body 41.
[0073] The outer casing 24 may include a housing 22 and an end cap 21. The housing 22 has an opening, and the end cap 21 covers the opening. Alternatively, the outer casing 24 may be a one-piece structure. The outer casing 24 may be cuboid, cylindrical, hexagonal prism, etc. Electrode terminals 26 may be provided on the outer casing 24. The tabs 40 may be connected to the electrode terminals 26 by welding, snap-fitting, bonding, or other means to output the electrical energy of the battery cell 20 to the outside. It is understood that the location where the tabs 40 need to connect to the electrode terminals 26 is not provided with a reinforcing structure 42.
[0074] The main body 25 can be formed by stacking or winding electrode sheets. The electrode tab 40 can be a positive electrode tab 40 or a negative electrode tab 40. The positive electrode tab 40 is connected to the positive electrode terminal 26, and the negative electrode tab 40 is connected to the negative electrode terminal 26. The positive electrode tab 40 and the negative electrode tab 40 can be located on opposite sides of the main body 25 or on the same side.
[0075] An active material can be coated on the main body 25, and the tab 40 is the portion without active material coating. For example, the main body 25 of the positive electrode can be made of aluminum foil, and the main body 25 of the negative electrode can be made of copper foil. Positive electrode active materials such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate can be coated on the main body 25 of the positive electrode, and negative electrode active materials such as graphite, silicon carbide, and lithium titanate can be coated on the main body 25 of the negative electrode.
[0076] The first reinforcing rib 421 can be rectangular, elliptical, or other shapes, while the second reinforcing rib 422 can be rhomboid, rectangular, square, or other polygonal shapes. The reinforcing structure 42 can be formed by pressing it onto the electrode sheet using a pressure roller. For example, a protrusion with the same shape and size as the first reinforcing rib 421 and the second reinforcing rib 422 can be designed on the pressure roller, so that when pressed onto the electrode sheet, corresponding protrusions of the first reinforcing rib 421 and the second reinforcing rib 422 are formed. At least a portion of the second reinforcing rib 422 is deeper than the first reinforcing rib 421, making the bottom of at least a portion of the second reinforcing rib 422 more prominent than the first reinforcing rib 421. Along the thickness direction of the electrode body 41, the projections of the first reinforcing rib 421 and the second reinforcing rib 422 can partially overlap, or the projection of the second reinforcing rib 422 can also be located within the projection range of the first reinforcing rib 421.
[0077] The first reinforcing rib 421 and the second reinforcing rib 422 can be disposed on the same side of the tab body 41, or the first reinforcing rib 421 can be disposed on one side and the second reinforcing rib 422 can be disposed on the other side. All of the first reinforcing ribs 421 or the second reinforcing ribs 422 can be disposed on the same side of the tab body 41, or some of the first reinforcing ribs 421 or the second reinforcing ribs 422 can be disposed on the same side of the tab body 41 and the other part can be disposed on the other side.
[0078] In the above solution, by providing a first reinforcing rib 421 and a second reinforcing rib 422 that at least partially overlap on the tab body 41, and by having different shapes for the first reinforcing rib 421 and the second reinforcing rib 422, the tab 40 can resist forces from more directions, resulting in greater stability. Furthermore, by having at least a portion of the second reinforcing rib 422 protrude relative to the first reinforcing rib 421 towards the side opposite to the tab body 41, the stability of the tab 40 can be further improved, and the current conduction area of the tab 40 can be increased, thereby improving the energy efficiency of the battery cell 20 and enhancing battery reliability.
[0079] In some embodiments, the projection of the second reinforcing rib 422 is located within the projection range of the first reinforcing rib 421 along the thickness direction of the tab body 41.
[0080] The shape of the first protrusion corresponding to the first reinforcing rib 421 can be provided on the pressure roller, and the second protrusion corresponding to the second reinforcing rib 422 is provided on the first protrusion. When the pressure roller presses on the electrode sheet, the first protrusion can press out the first reinforcing rib 421, and the second protrusion can press out the second reinforcing rib 422. Since the second protrusion on the pressure roller is located on the first protrusion, more first protrusions and second protrusions can be provided.
[0081] In the above scheme, by setting the second reinforcing rib 422 within the range of the first reinforcing rib 421, the number and density of reinforcing ribs can be increased, thereby further improving the stability of the tab 40.
[0082] In some embodiments, the first reinforcing rib 421 extends along the first direction X, and a plurality of spaced second reinforcing ribs 422 are spaced apart along the first direction X.
[0083] The first direction X can be the direction in which the tab 40 points to the main body 25, and the first reinforcing rib 421 can be a rectangle or an ellipse extending along the first direction X. Multiple second reinforcing ribs 422 can be arranged at intervals along the first direction X on the first reinforcing rib 421. The shape of the second reinforcing rib 422 can be rhomboid, rectangular, square, or other polygonal.
[0084] For example, the first direction X is the longitudinal direction. When the first reinforcing rib 421 collapses or folds due to the force in the transverse direction, the second reinforcing rib 422 can prevent such deformation.
[0085] In the above scheme, by extending the first reinforcing rib 421 along the first direction X, the first reinforcing rib 421 can resist the force from other directions intersecting the first direction X; by arranging multiple spaced second reinforcing ribs 422 at intervals along the first direction X, the second reinforcing ribs 422 can resist the force from the first direction X, thereby enabling the tab 40 to resist the force from all directions, ensuring that the tab 40 will not deform to a certain extent, thereby improving the stability of the tab 40.
[0086] In some embodiments, a plurality of first reinforcing ribs 421 are spaced apart along the second direction Y, and the first direction X and the second direction Y are intersected.
[0087] The first direction X can be the direction from the tab 40 to the main body 25, i.e., the longitudinal direction. Then the second direction Y can be perpendicular to the first direction X, for example, the width direction.
[0088] In the above scheme, multiple first reinforcing ribs 421 are spaced apart along the second direction Y, which can not only further improve the stability of the tab 40, but also allow the same pressing roller to be used to press and obtain the reinforcing structure 42.
[0089] Figure 7 This is a schematic diagram of the tab structure of some other embodiments of this application.
[0090] like Figure 7 As shown, in some embodiments, a plurality of second reinforcing ribs 422 are staggered along the second direction Y.
[0091] When the second reinforcing ribs 422 are arranged at intervals along the second direction Y, there are gaps between the second reinforcing ribs 422 on adjacent first reinforcing ribs 421 along the second direction Y. However, in the embodiments of this application, the multiple second reinforcing ribs 422 are staggered along the second direction Y, which can reduce the gaps, or even eliminate them.
[0092] In the above scheme, by staggering multiple second reinforcing ribs 422 along the second direction Y, the staggered second reinforcing ribs 422 can resist more forces along the second direction Y, and to a certain extent prevent the tab 40 from bending and deforming along the second direction Y.
[0093] Figure 8 This is a partial schematic diagram of the reinforcement structure of some embodiments of this application.
[0094] like Figure 8 As shown, in some embodiments, the width of the second reinforcing rib 422 along the second direction Y is L1, and the width of the first reinforcing rib 421 along the second direction Y is L2. L1 and L2 satisfy: 0.1≤L1 / L2<1.
[0095] It should be noted that when the first reinforcing rib 421 is rectangular, its width L1 is the width of the rectangle; if the first reinforcing rib 421 is elliptical or other irregular elongated shape, its width refers to the maximum width along the second direction Y. When the second reinforcing rib 422 is square or rectangular, its width is the width of the square or rectangle; if the second reinforcing rib 422 is rhomboid or other polygonal, its width is the maximum width along the second direction Y.
[0096] Wherein, L1 / L2 can be any value from 0.1 to 1. For example, L1 / L2 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.
[0097] In the above scheme, by setting L1 / L2 within a suitable range, both the density of the reinforcing ribs and the stability of the tab 40 can be taken into account.
[0098] In some embodiments, L1 and L2 satisfy: 0.8 ≤ L1 / L2 < 1.
[0099] Where L1 / L2 can be any value between 0.8 and 1. For example, L1 / L2 can be 0.8, 0.85, 0.88, 0.91, 0.92, or 0.95, etc.
[0100] In the above scheme, by further limiting the range of L1 / L2, the width of the second reinforcing rib 422 is increased, thereby improving the ability of the second reinforcing rib 422 to resist forces acting in multiple directions.
[0101] Figure 9 This is a schematic diagram of the electrode structure of some embodiments of this application.
[0102] like Figure 9 As shown, in some embodiments, the reinforcing structure 42 further includes a third reinforcing rib 423, which is spaced apart along the first direction X, and the shape of the third reinforcing rib 423 is different from that of the second reinforcing rib 422.
[0103] The second reinforcing rib 422 can be rhomboid, rectangular, square, or other polygonal shapes. The third reinforcing rib 423 can be circular, elliptical, or other shapes.
[0104] A second reinforcing rib 422 and a third reinforcing rib 423 can be provided simultaneously on the same first reinforcing rib 421, or a second reinforcing rib 422 and a third reinforcing rib 423 can be provided on different first reinforcing ribs 421 respectively. Alternatively, the third reinforcing rib 423 can also be provided between adjacent first reinforcing ribs 421.
[0105] In the above scheme, by adding a third reinforcing rib 423 of different shapes, the tab 40 can be further made to resist forces from more directions, and its stability is stronger.
[0106] In some embodiments, the projection of the third reinforcing rib 423 is within the projection range of the first reinforcing rib 421 along the thickness direction of the tab body 41.
[0107] Alternatively, multiple third reinforcing ribs 423 can be arranged at intervals along the first direction X, and the projected area of the multiple third reinforcing ribs 423 is smaller than the projected area of the first reinforcing rib 421.
[0108] In the above scheme, by setting the third reinforcing rib 423 within the range of the first reinforcing rib 421, a larger number of third reinforcing ribs 423 can be set without occupying the space of the welding position of the electrode tab 40, thereby improving the space utilization rate.
[0109] In some embodiments, the second reinforcing rib 422 and the third reinforcing rib 423 are alternately arranged along the first direction X.
[0110] In the above scheme, by alternating the second reinforcing rib 422 and the third reinforcing rib 423 along the first direction X, the strength of the electrode tab 40 can be enhanced, further reducing the risk of deformation of the electrode tab 40. The alternating arrangement of the second reinforcing rib 422 and the third reinforcing rib 423 can guide the current to be distributed more evenly on the electrode tab 40, avoiding current concentration in local areas and reducing heat generation and energy loss caused by uneven current.
[0111] In some embodiments, the area of the first reinforcing rib 421 is S1, and the area of the second reinforcing rib 422 is S2, wherein S1 and S2 satisfy: 1≤S1 / S2≤10.
[0112] S1 / S2 can be any value from 1 to 10. For example, S1 / S2 can be 1, 2, 4, 5, 7, 8, or 10, etc.
[0113] It should be noted that the area S1 of the first reinforcing rib 421 and the area S2 of the second reinforcing rib 422 refer to the projected area of the first reinforcing rib 421 along the thickness direction of the tab body 41.
[0114] In the above scheme, by limiting S1 / S2 within a suitable range, the functions of the first reinforcing rib 421 and the second reinforcing rib 422 can be taken into account, so that the tab 40 resists the force in all directions in a more balanced way.
[0115] In some embodiments, S1 and S2 satisfy: 1.2≤S1 / S2≤2.
[0116] Wherein, S1 / S2 can be any value between 1.2 and 2. For example, S1 / S2 can be 1.2, 1.3, 1.4, 1.5, 1.7, 1.9, or 2, etc.
[0117] In the above scheme, by further limiting the range of S1 / S2, the tab 40 can be made to resist the forces in all directions more evenly, thereby reducing the deformation of the tab 40 at various positions.
[0118] Figure 10 This is a schematic diagram of the tab structure in some embodiments of this application.
[0119] like Figure 10 As shown, in some embodiments, the tab 40 includes a first side 43 and a second side 44 disposed opposite to each other, the first side 43 being closer to the main body 25 than the second side 44, and the width of the first side 43 being greater than the width of the second side 44.
[0120] The first side 43 is the side where the tab 40 connects to the main body 25, and the second side 44 is the side away from the main body 25. The tab 40 can be trapezoidal or other shapes.
[0121] In the above solution, by setting the width of the first side 43 of the tab 40 near the main body 25 to be greater than the width of the second side 44, the flow area at the connection between the tab 40 and the main body 25 can be increased, thereby improving the flow capacity and safety at this point.
[0122] In some embodiments, at least one first reinforcing rib 421 extends to the first side 43 and the second side 44 at both ends. That is, one end of at least one first reinforcing rib 421 is connected to the first side 43, and the other end is connected to the second side 44. For example, at least one first reinforcing rib 421 may be rectangular, extending along the first direction X, with both ends extending to the first side 43 and the second side 44 respectively. Embodiments of this application can increase the extension length of the first reinforcing rib 421, thereby reducing the risk of the tab 40 bending.
[0123] In some embodiments, the tab 40 further includes two third sides 45 disposed opposite to each other, the two ends of the third sides 45 being connected to the first side 43 and the second side 44 respectively, and the two ends of at least one first reinforcing rib 421 extending to the first side 43 and the third side 45.
[0124] The third side 45 can be a bevel or a curved shape. At least one end of the first reinforcing rib 421 is connected to the first side 43, and the other end is connected to the third side 45.
[0125] In the above scheme, the third side 45 is an inclined plane. By extending at least one first reinforcing rib 421 to the third side 45, the space near the third side 45 can also be arranged with the first reinforcing rib 421, thereby strengthening the strength at this point.
[0126] Secondly, embodiments of this application also provide a battery device 100, including a battery cell 20 of any of the above embodiments.
[0127] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery device 100, which is used to provide electrical energy.
[0128] According to some embodiments of this application, this application provides a battery cell 20, which includes a housing 24 and an electrode assembly 23. The electrode assembly 23 is disposed inside the housing 24 and includes a main body 25 and tabs 40 extending from the end of the main body 25. The tab 40 includes a tab body 41 and a reinforcing structure 42 disposed on the tab body 41. The reinforcing structure 42 includes a first reinforcing rib 421 and a second reinforcing rib 422 with different shapes. Along the thickness direction of the tab body 41, the projection of the first reinforcing rib 421 and the projection of the second reinforcing rib 422 at least partially overlap. At least a portion of the second reinforcing rib 422 protrudes from the first reinforcing rib 421 to the side away from the tab body 41. The reinforcing structure 42 also includes a third reinforcing rib 423, which is spaced apart along a first direction X. The third reinforcing rib 423 has a different shape from the second reinforcing rib 422.
[0129] 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 by, The battery cell comprises: a shell; an electrode assembly arranged inside the shell, the electrode assembly comprising a main body and a tab extending from an end of the main body, the tab comprising a tab body and a reinforcing structure arranged on the tab body, the reinforcing structure comprising a first reinforcing rib and a second reinforcing rib which are different in shape, a projection of the first reinforcing rib at least partially overlaps a projection of the second reinforcing rib in a thickness direction of the tab body, and at least part of the second reinforcing rib is convexly arranged relative to a side of the first reinforcing rib away from the tab body.
2. The battery cell of claim 1, wherein, The projection of the second reinforcing rib is located within the projection range of the first reinforcing rib in the thickness direction of the tab body.
3. The battery cell of claim 1, wherein, The first reinforcing rib extends in a first direction, and a plurality of spaced second reinforcing ribs are arranged in the first direction.
4. The battery cell of claim 3, wherein, A plurality of the first reinforcing ribs are arranged in a second direction, and the first direction intersects the second direction.
5. The battery cell of claim 4, wherein, A plurality of the second reinforcing ribs are arranged in the second direction in a staggered manner.
6. The battery cell of claim 4, wherein, The width of the second reinforcing rib in the second direction is L1, and the width of the first reinforcing rib in the second direction is L2, and the L1 and the L2 satisfy: 0.1≤L1 / L2<1.
7. The battery cell of claim 6, wherein, The L1 and the L2 satisfy: 0.8≤L1 / L2<1.
8. The battery cell of claim 3, wherein, The reinforcing structure further comprises a third reinforcing rib, the third reinforcing rib is arranged in the first direction in a spaced manner, and the third reinforcing rib is different in shape from the second reinforcing rib.
9. The battery cell of claim 8, wherein, The projection of the third reinforcing rib is within the projection range of the first reinforcing rib in the thickness direction of the tab body.
10. The battery cell of claim 8, wherein, The second reinforcing rib and the third reinforcing rib are arranged in the first direction in an alternating manner.
11. The battery cell of claim 1, wherein, The area of the first reinforcing rib is S1, and the area of the second reinforcing rib is S2, and the S1 and the S2 satisfy: 1≤S1 / S2≤10.
12. The battery cell of claim 11, wherein, The S1 and the S2 satisfy: 1.2≤S1 / S2≤2.
13. The battery cell of claim 1, wherein, The tab comprises a first side and a second side arranged opposite to each other, the first side is closer to the main body relative to the second side, and the width of the first side is greater than the width of the second side.
14. The battery cell of claim 13, wherein, Both ends of at least one of the first reinforcing ribs extend to the first side and the second side.
15. The battery cell of claim 13, wherein, The tab further comprises two third sides arranged opposite to each other, both ends of the third side are connected to the first side and the second side respectively, and both ends of at least one of the first reinforcing ribs extend to the first side and the third side.
16. A battery device characterized by comprising: The battery cell according to any one of claims 1-15.
17. An electrical device, comprising: The battery device according to claim 16, the battery device is used to provide electric energy.