Tab structure, tab and battery

Abstract

The application discloses an electrode lug structure, an electrode lug and a battery. The electrode lug structure is located on an electrode lug and comprises an electrode lug body and at least one reinforcing part. The electrode lug body has a first side edge opposite to an electrode lug body of the electrode lug. The reinforcing part is recessed from one side surface of the electrode lug body and protrudes from the other side of the electrode lug body. The reinforcing part extends between the first side edge and the electrode lug body. An included angle formed by the reinforcing part and a straight line where the first side edge is located is θ, wherein 60°≤θ≤80°. The probability of the occurrence of the folding condition of the electrode lug in the transmission, winding and other processes caused by stress concentration is reduced, and the generation yield and product consistency are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a tab structure, electrode sheet, and battery cell. Background Technology

[0002] As the energy density requirements of lithium-ion batteries continue to increase, the thickness of metal foils (such as copper foil) used as negative electrode current collectors is continuously decreasing, with the current mainstream thickness dropping to 4.5–6 μm. The thinner the foil, the more flexible the tabs, making them more prone to folding, warping, or breakage during battery production processes such as winding, handling, and welding.

[0003] In related technologies, the stiffness of the tab material is locally increased to suppress tab bending, but the overall effect is limited and it is easy to introduce new stress concentrations on the tab, which can lead to failure problems such as tab breakage. Summary of the Invention

[0004] This application provides an electrode structure, electrode sheet, and battery cell to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a tab structure, located on a electrode plate, includes: The electrode body has a first side opposite to the electrode body of the electrode plate; At least one reinforcing part is recessed from one side of the electrode body and protrudes from the other side of the electrode body. The reinforcing part extends between the first side and the electrode body. The angle formed by the reinforcing part and the straight line containing the first side is θ, where 60°≤θ≤80°.

[0006] Optionally, multiple reinforcing parts are provided along the extending direction of the first side, with the multiple reinforcing parts spaced apart.

[0007] Optionally, the distance between adjacent reinforcing parts is D, where 5mm≤D≤10mm.

[0008] Optionally, the depth of the recess in the reinforcing part is H, where 80 μm ≤ H ≤ 130 μm; and / or, Optionally, the distance between the end of the reinforcing part near the electrode body and the electrode body is L, where 1mm≤L≤3mm.

[0009] Optionally, the reinforcing part includes a reinforcing side and a reinforcing bottom, wherein the end of the reinforcing side near the pole body is smoothly connected to the pole body via a first reinforcing sub-part, and / or the end of the reinforcing side away from the pole body is smoothly connected to the reinforcing bottom via a second reinforcing sub-part.

[0010] Optionally, the electrode body also includes a second side and a third side disposed opposite to each other, the second side and the third side being connected between the first side and the electrode body, the ends of the second side and the third side being relatively close to the first side and relatively far apart from each other.

[0011] Optionally, the angle formed by the second side and the straight line containing the side of the electrode body closest to the tab body is α1, and the angle formed by the third side and the straight line containing the side of the electrode body closest to the tab body is α2, wherein α1 and α2 satisfy at least one of the following: 100°≤а1≤110°; 100°≤а2≤110°; а1=а2.

[0012] Optionally, the two ends of the first side are connected to the second side and the third side respectively through the first rounded corner, wherein the radius of the first rounded corner is r1, and 8mm≤r1≤20mm; And / or, the ends of the second and third sides away from the first side are smoothly connected to the edge of the electrode body through the second rounded corner portion, wherein the radius of the second rounded corner portion is r2, and 8mm≤r2≤20mm.

[0013] According to a second aspect of this application, an electrode is provided, comprising the electrode tab structure of any one of the above.

[0014] According to a third aspect of this application, a battery is provided, comprising the aforementioned electrode.

[0015] In the tab structure, electrode sheet, and battery cell of this application embodiment, by setting a reinforcing part at a specific angle, the stress concentrated at the root or end of the tab is decomposed, so that the force path changes from a straight line to an oblique line, the stress transmission path is extended, and the stress peak value is reduced. This reduces the probability of the tab folding during transmission and winding due to stress concentration, thereby improving the production yield and product consistency.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is a schematic diagram of the overall structure of the electrode provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the overall structure of the electrode provided in an exemplary embodiment of this disclosure; Figure 3 yes Figure 2 Schematic diagram of the cross section of AA; Figure 4 yes Figure 3 Enlarged schematic diagram of part B in the middle; Figure 5 yes Figure 2 Sectional perspective of AA; Figure 6 This is a side view of the tab structure after the angle has been adjusted according to the exemplary embodiment of this disclosure; Figure 7 yes Figure 6 An enlarged schematic diagram of section C.

[0019] Explanation of reference numerals in the attached figures: 10. Electrode; 100. Electrode structure; 110. Electrode body; 111. First side; 112. Second side; 113. Third side; 114. First rounded corner; 115. Second rounded corner; 120. Reinforcing part; 121. Recess; 122. Protrusion; 123. Reinforcing side; 124. Reinforcing bottom; 125. First reinforcing sub-part; 126. Second reinforcing sub-part; 200. Pole piece body. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] See Figure 1 and Figure 2This application provides an electrode tab structure 100 located on an electrode sheet 10, including an electrode tab body 110 and at least one reinforcing portion 120. The electrode tab body 110 has a first side 111 opposite to the electrode sheet body 200 of the electrode sheet 10. Using suitable metal materials, such as copper or aluminum, the electrode tab body 110 and the electrode sheet body 200, having a first side 111, a second side 112, and a third side 113, are fabricated according to design requirements through processes such as stamping and cutting. The electrode sheet body 200 serves as the current collector for the electrode sheet 10. The reinforcing portion 120 is recessed from one side of the electrode tab body 110 and protrudes from the other side. The reinforcing portion 120 is a concave-convex structure formed by embossing or stamping. The reinforcing portion 120 includes a recess 121 and a protrusion 122 formed opposite to the recess 121. The reinforcing portion 120 extends from a position near the first side 111 towards the electrode sheet body 200. The angle formed by the straight line containing the reinforcing part 120 and the first side 111 is θ, where 60°≤θ≤80°. The value of θ can be 60°, 62°, 65°, 67°, 70°, 71°, 72°, 73°, 74°, 76°, 78°, 79°, 80° or other unlisted values.

[0022] In this embodiment, by setting a reinforcing portion 120 at a specific angle, the tensile stress concentrated at the root or end of the electrode tab is decomposed into a shear force along the direction of the reinforcing portion 120 and a normal force perpendicular to the reinforcing rib. Compared to the reinforcing rib perpendicular to the first side 111, the force path changes from a straight line to an oblique line, the stress transmission path is lengthened, and the stress peak value is reduced. This reduces the probability of buckling during electrode transmission and winding due to stress concentration, thereby improving the production yield and product consistency.

[0023] If θ is less than 80°, the reinforcing part 120 is close to perpendicular to the first side 111, and the stress dispersion effect is not good; if θ is greater than 60°, the stress decomposition is more complete, but the reinforcing part 120 itself will produce excessive shear deformation when subjected to force, causing a new stress concentration point to be generated at its end near the tab body 110, which may become the source of crack initiation and weaken the overall strength of the tab.

[0024] In this embodiment, the angle design between the reinforcing part 120 and the first side 111 can effectively extend the stress transmission path and avoid the generation of new stress concentration points at its own end. It achieves the optimal balance between stress dispersion effect and structural strength, reduces the probability of buckling during electrode transmission and winding due to stress concentration, and improves production yield and product consistency.

[0025] In some embodiments, see Figure 1 and Figure 2Multiple reinforcing parts 120 are provided along the extension direction of the first side 111, and the multiple reinforcing parts 120 are spaced apart.

[0026] In some examples, the tab body 110 includes a first side 111, a second side 112, and a third side 113. The first side 111 is disposed opposite to one side of the electrode body 200 near the tab body 110. The second side 112 connects one end of the first side 111 to the tab body 110, and the third side 113 connects the other end of the first side 111 to the tab body 110. The second side 112 and the third side 113 are disposed opposite to each other. Along the extending direction of the first side 111, a plurality of reinforcing portions 120 are formed on the tab body 110. Each reinforcing portion 120 has an elongated structure. The plurality of reinforcing portions 120 are arranged in parallel. The reinforcing portions 120 extend between the first side 111 and the electrode body 200, with one end of the reinforcing portion 120 penetrating through the first side 111 and the other end spaced a certain distance from the electrode body 200.

[0027] In this embodiment, by setting multiple reinforcing parts 120, the multiple reinforcing parts 120 work together to share the stress, reducing the probability of the electrode tip flipping due to local stress overload on the electrode tip body 110.

[0028] In some embodiments, see Figure 6 and Figure 7 The distance between adjacent reinforcing parts 120 is D, where 5mm ≤ D ≤ 10mm. The value of D can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or other unlisted values.

[0029] In this embodiment, if the distance between adjacent reinforcing parts 120 is small and the number of reinforcing parts 120 per unit width is large, the tab body 110 will become brittle, and there is a risk of cracking during winding and bending. If the distance between adjacent reinforcing parts 120 is large and the number of reinforcing parts 120 per unit width is small, there will be weak areas on the tab body 110, which will also increase the risk of buckling during the winding and bending process. The 5mm-10mm range balances the technical defects of "too dense and brittle" and "too sparse and weak". While ensuring that multiple reinforcing parts 120 work together to bear the load and form a continuous stress transmission network, it retains the necessary toughness and plasticity of the tab body 110, thereby significantly reducing the probability of cracking or buckling failure of the tab during manufacturing and use.

[0030] In some examples, the reinforcing portions 120 on the tab body 110 are evenly spaced. Alternatively, the spacing between the reinforcing portions 120 in the regions of the tab body 110 near the second side 112 and the third side 113 is smaller than the spacing between the reinforcing portions 120 in other regions of the tab body 110. Alternatively, the spacing between the reinforcing portions 120 in the middle region of the tab body 110 is smaller than the spacing between the reinforcing portions 120 in other regions of the tab body 110.

[0031] In some embodiments, see Figure 6 and Figure 7 The depth of the recess in the reinforcing part 120 is H, where 80μm ≤ H ≤ 130μm. The depth of the recess in the reinforcing part 120 refers to the vertical distance between the plane containing one side of the tab body 110 and the plane containing the bottom of the recess in the reinforcing part 120. The value of H can be 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 114μm, 118μm, 120μm, 125μm, 130μm, or other unlisted values.

[0032] In some examples, the recesses of the various reinforcing portions 120 on the tab body 110 are of the same depth, which facilitates processing.

[0033] In some examples, the depth of the recesses of the plurality of reinforcing portions 120 in the two regions near the second side 112 and the third side 113 of the tab body 110 is less than the depth of the recesses in other regions of the tab body 110. Alternatively, the depth of the recesses of the plurality of reinforcing portions 120 in the two regions near the second side 112 and the third side 113 of the tab body 110 is greater than the depth of the recesses in other regions of the tab body 110.

[0034] In some embodiments, see Figure 6 and Figure 7 The width of the recess in the reinforcing part 120 is S, where 1mm ≤ S ≤ 5mm. The width of the recess in the reinforcing part 120 refers to the dimension of the opening end of the recess in the reinforcing part 120. The value of S can be 1mm, 2mm, 3mm, 4mm, 5mm or other unlisted values.

[0035] The width S of the recess in the reinforcing part 120 determines its lateral dimension, directly affecting its load-bearing capacity and the connection strength with the tab body 110. When S < 1 mm, the reinforcing part 120 is too narrow, its contribution to bending resistance is limited, and it is prone to producing serrated edges during stamping. When S > 5 mm, the reinforcing part 120 is too wide, occupying too much area of ​​the tab body 110, which may result in an insufficiently small unembossed area and a decrease in the overall flexibility of the tab. The range of 1 mm to 5 mm ensures that the reinforcing part 120 has sufficient cross-sectional stiffness while retaining a sufficient gap area to maintain the necessary bending performance of the tab.

[0036] In some examples, the recesses of the various reinforcing portions 120 on the tab body 110 have the same width. This design, where the reinforcing portions 120 have the same width, simplifies the mold structure and facilitates consistency control in mass production.

[0037] In some examples, the width of the recesses of the plurality of reinforcing portions 120 in the two side regions near the second side 112 and the third side 113 of the tab body 110 is smaller than the width of the recesses in other regions of the tab body 110. Alternatively, the width of the recesses of the plurality of reinforcing portions 120 in the two side regions near the second side 112 and the third side 113 of the tab body 110 is greater than the width of the recesses in other regions of the tab body 110.

[0038] The differentiated width design creates reinforcement sections 120 of varying widths in different areas. For example, using narrower reinforcement sections 120 in edge areas reduces the impact on edge integrity, while using wider reinforcement sections 120 in the middle area enhances the core load-bearing capacity. This reverse configuration based on specific stress characteristics provides more optimization space for the design of the tabs under complex load conditions.

[0039] In some embodiments, see Figure 1 The distance between the end of the reinforcing portion 120 closest to the electrode body 200 and the electrode body 200 is L, where 1mm ≤ L ≤ 3mm. The value of L can be 1mm, 1.5mm, 2mm, 2.2mm, 2.5mm, 3mm, or other unlisted values. This allows the reinforcing portion 120 to maintain sufficient length without affecting the structure of the electrode body 200, thereby providing good structural strength and improving the stability and reliability of the overall structure.

[0040] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The reinforcing part 120 includes a reinforcing side part 123 and a reinforcing bottom part 124. The end of the reinforcing side part 123 near the pole body is smoothly connected to the pole body 110 via a first reinforcing sub-part 125. The end of the reinforcing side part 123 away from the pole body is smoothly connected to the reinforcing bottom part 124 via a second reinforcing sub-part 126.

[0041] The reinforcing portion 120 formed by the pressure roller is prone to generating geometric sharp angles at the plane between the side wall and the tab body 110, and at the connection between the side wall and the bottom. These sharp angles will cause significant stress concentration when under force. By setting the first reinforcing sub-portion 125 and / or the second reinforcing sub-portion 126, a smooth transition is achieved, eliminating the geometric abruptness of the reinforcing portion 120 itself, so that the stress is continuously and smoothly transmitted between the plane of the tab body 110, the reinforcing side portion 123, and the reinforcing bottom portion 124, reducing local stress peaks.

[0042] In some embodiments, see Figure 1 and Figure 2 The electrode body 110 also includes a second side 112 and a third side 113 disposed opposite to each other. The second side 112 and the third side 113 are connected between the first side 111 and the electrode body 200. The ends of the second side 112 and the third side 113 closer to the first side 111 are relatively close, while the other ends are relatively far apart. It can be understood that the electrode body 110 is trapezoidal or trumpet-shaped, gradually widening from the first side 111 to the electrode body 200.

[0043] In this embodiment, the tab adopts a trapezoidal profile. This shape allows the force flow to naturally diffuse from the narrow section of the tab body 110 to the wide end of the electrode body 200, avoiding the stress abrupt change caused by right-angle connections. This reduces the magnitude and lever arm length of the external force experienced by the tab during airflow or contact, and reduces the drag torque acting at the root of the tab, making the tab more stable and less prone to tipping or deformation during movement.

[0044] In some embodiments, see Figure 1 and Figure 2 The angle formed by the second side 112 and the straight line containing the side of the electrode body 200 near the electrode tab body 110 is α1, and the angle formed by the third side 113 and the straight line containing the side of the electrode body 200 near the electrode tab body 110 is α2, satisfying at least one of the following: 100°≤α1≤110°; 100°≤α2≤110°; α1=α2.

[0045] In some sub-examples, 100°≤а1=а2≤110°, where the values ​​of а1 and а2 can be 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109°, 110° or other unlisted values.

[0046] When a1 or a2 is less than 100°, the tab shape is close to rectangular, and the stress diffusion effect is not obvious; when it is greater than 110°, the root of the tab is too wide, which will encroach on the coating area of ​​the electrode body 200, affecting the battery energy density. The 100°-110° range achieves the optimal balance between stress diffusion effect and energy density. The symmetrical design of a1=a2 makes the stress distribution more uniform and is conducive to the automated alignment and welding of the tab.

[0047] In some embodiments, see Figure 1 and Figure 2 The two ends of the first side 111 are connected to the second side 112 and the third side 113 respectively through the first rounded corner portion 114. The radius of the first rounded corner portion 114 is r1, where 8mm ≤ r ≤ 20mm. The value of r1 can be 8mm, 9mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or other unlisted values.

[0048] The first rounded corner 114 eliminates the right-angle inflection points at both ends of the electrode lug, enabling a smooth transition between the end of the electrode lug and the second side 112 and the third side 113. This reduces the probability of burrs and curling edges forming on the electrode lug during punching and transmission, and also eliminates stress concentration caused by geometric abrupt changes.

[0049] The radius design of the first rounded corner 114, together with the angle between the second side 112 and the edge of the electrode body 200, the angle between the third side 113 and the edge of the electrode body 200, and the angle of the reinforcing part 120 (10°-30°), work together to construct a structural reinforcement system covering the entire area of ​​the electrode, from the electrode tab outline, overall reinforcement, and local transition, so as to reduce the probability of the electrode tab folding.

[0050] In some embodiments, see Figure 1 and Figure 2 The ends of the second side 112 and the third side 113 furthest from the first side 111 are connected to the electrode body 200 via a second rounded corner 115, wherein the radius of the second rounded corner 115 is r2, where 8mm ≤ r2 ≤ 20mm. The value of r can be 8mm, 9mm, 10mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or other unlisted values.

[0051] It should be noted that the second rounded corner portion 115 is located differently from the first rounded corner portion 114 located at both ends of the first side 111. The second rounded corner portion 115 is located at the connection between the base of the electrode tab and the electrode body 200, and is used to achieve a smooth transition from the electrode body 110 to the electrode body 200.

[0052] The second rounded corner 115 eliminates the geometric abrupt change at the connection between the root of the tab body 110 and the electrode body 200, enabling a smooth transition between the second side 112, the third side 113 and the edge of the electrode body 200. This significantly reduces the stress concentration factor in the connection area and effectively suppresses cracking.

[0053] The electrode structure is divided into three sections: the tip, the body, and the root. It covers the entire length of the electrode and forms a triple protection mechanism of "preventing defects at the tip, preventing folding in the body, and preventing tearing at the root". This significantly reduces the probability of failure modes such as folding, tearing, and curling of the electrode during manufacturing and use, and comprehensively improves the manufacturability and long-term reliability of the electrode structure 100.

[0054] According to the second aspect of this disclosure, see Figure 1 An electrode 10 is provided, which includes the tab structure 100 of any of the above-described embodiments. The electrode 10 has all the beneficial effects of the tab structure 100 described above, which will not be repeated here.

[0055] According to a third aspect of this disclosure, a battery is provided that includes the electrode 10 described above. This battery possesses all the beneficial effects of the electrode 10 described above, which will not be elaborated further herein.

[0056] The embodiments of this application will also be described in detail below.

[0057] See Figure 1 and Figure 2 The electrode 10 includes an electrode body 200 and an electrode tab structure 100. The electrode tab structure 100 includes an electrode tab body 110, which is connected to one side edge of the electrode body 200 and extends beyond the electrode body 200. The electrode tab body 110 includes a first side 111, a second side 112, and a third side 113. The first side 111 is disposed opposite to one side edge of the electrode tab body 110. The second side 112 connects one end of the first side 111 to the electrode body 200, and the third side 113 connects the other end of the first side 111 to the electrode body 200. One end of the second side 112 and the third side 113 is smoothly connected to the first side 111 through a first rounded corner portion 114, and the other end is smoothly connected to the electrode body 200 through a second rounded corner portion 115. The radius of the first rounded corner portion 114 is r1, and the radius of the second rounded corner portion 115 is r2. The angle between the second side 112 and the straight line containing the side of the electrode body 200 closest to the tab body 110 is α1, and the angle between the third side 113 and the straight line containing the side of the electrode body 200 closest to the tab body 110 is α2.

[0058] The electrode body 200 has multiple reinforcing portions 120. Each reinforcing portion 120 is recessed from one side of the electrode tab body 110 and protrudes from the other side of the electrode tab body 110. The reinforcing portion 120 extends between the first side edge 111 and the electrode body 200, and the angle formed by the straight line containing the reinforcing portion 120 and the first side edge 111 is θ. Each reinforcing portion 120 includes a reinforcing side portion 123 and a reinforcing bottom portion 124. The end of the reinforcing side portion 123 near the electrode post body is smoothly connected to the electrode tab body 110 via a first reinforcing sub-portion 125, and / or, the end of the reinforcing side portion 123 away from the electrode post body is smoothly connected to the reinforcing bottom portion 124 via a second reinforcing sub-portion 126. The distance between adjacent reinforcing portions 120 is D. The depth of the recess in the reinforcing portion 120 is H. The width of the recess in the reinforcing portion 120 is S. The distance between the end of the reinforcing portion 120 near the electrode body 200 and the electrode body 200 is L.

[0059] The parameters and verification results of each embodiment and comparative example are shown in Table 1:

[0060] The above embodiments and comparative examples were tested using the following methods: 6000 pieces of electrode sheet 10 are selected and die-cut according to the relevant parameters of the embodiment or comparative example. The die-cutting process is stopped when the number of qualified products reaches 5000 pieces. The 5000 qualified die-cut products are transferred to the winding process for winding. During the winding process, the winding machine can automatically identify the number of defective tabs. The final tab folding ratio = (number of defective products / number of products put in) * 100%.

[0061] According to the verification results in Table 1: According to the verification results of Examples 1, 2, 3, Comparative Examples 1 and 2, when θ is in the range of 60° to 80°, the tab folding ratio is relatively low, and when it is greater than or less than the range, the tab folding ratio is relatively large. According to the verification results of Examples 2, 4, 5, Comparative Examples 3 and 4, the tab folding ratio is low when H is in the range of 80μm to 130μm, and the tab folding ratio is large when H is greater or less than the range. According to the verification results of Examples 2, 6, 7, Comparative Example 5 and Comparative Example 6, when S is in the range of 1 mm to 5 mm, the tab folding ratio is low, and when it is greater or less than the range, the tab folding ratio is large. According to the verification results of Examples 2, 8, 9, Comparative Example 7 and Comparative Example 8, when D is in the range of 5mm to 10mm, the tab folding ratio is relatively low, and when it is greater or less than the range, the tab folding ratio is relatively large. According to the verification results of Examples 2, 10, 11, Comparative Example 9 and Comparative Example 10, α1 and α2 are the same and their values ​​are in the range of 100~110°. The tab folding ratio is low. When the value is greater than or less than the range, the tab folding ratio is large. According to the verification results of Examples 2, 14, 15, Comparative Examples 13 and 14, when L is in the range of 1 mm to 3 mm, the size of L does not affect the tab folding ratio. If L is too small, the reinforcing part 120 is too close to the electrode body 200, and the superposition of stamping stress will affect the edge structure stability of the electrode body 200. During winding, the stress concentration at the edge of the electrode 10 may cause cracks or tears. If L is too large, the tab folding ratio is too large.

[0062] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0064] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A tab structure (100) located on a electrode plate (10), characterized in that, include: The electrode body (110) has a first side (111) opposite to the electrode body (200) of the electrode (10). At least one reinforcing portion (120) is recessed from one side of the electrode body (110) and protrudes from the other side of the electrode body (110). The reinforcing portion (120) extends between the first side (111) and the electrode body (200). The angle formed by the reinforcing portion (120) and the straight line containing the first side (111) is θ, where 60°≤θ≤80°.

2. The electrode structure (100) according to claim 1, characterized in that, A plurality of reinforcing portions (120) are provided along the extending direction of the first side (111), and the plurality of reinforcing portions (120) are spaced apart.

3. The electrode structure (100) according to claim 2, characterized in that, The distance between adjacent reinforcing parts (120) is D, where 5mm≤D≤10mm.

4. The electrode structure (100) according to claim 2, characterized in that, The depth of the recess in the reinforcing part (120) is H, 80μm≤H≤130μm; and / or, The width of the recess in the reinforcing part (120) is S, where 1mm ≤ S ≤ 5mm.

5. The electrode structure (100) according to claim 1, characterized in that, The distance between the end of the reinforcing part (120) near the electrode body (200) and the electrode body (200) is L, where 1mm≤L≤3mm.

6. The electrode structure (100) according to claim 1, characterized in that, The reinforcing part (120) includes a reinforcing side part (123) and a reinforcing bottom part (124). The end of the reinforcing side part (123) near the pole body is smoothly connected to the pole body (110) through a first reinforcing sub-part (125), and / or the end of the reinforcing side part (123) away from the pole body is smoothly connected to the reinforcing bottom part (124) through a second reinforcing sub-part (126).

7. The electrode structure (100) according to any one of claims 1 to 6, characterized in that, The electrode body (110) also includes a second side (112) and a third side (113) disposed opposite to each other. The second side (112) and the third side (113) are connected between the first side (111) and the electrode body (200). The second side (112) and the third side (113) are relatively close to each other at one end near the first side (111), and relatively far away at the other end.

8. The electrode structure (100) according to claim 7, characterized in that, The angle formed by the second side (112) and the straight line of the side of the electrode body (200) near the electrode body (110) is α1, and the angle formed by the third side (113) and the straight line of the side of the electrode body (200) near the electrode body (110) is α2. α1 and α2 satisfy at least one of the following: 100°≤α1≤110°; 100°≤α2≤110°; α1=α2.

9. The electrode structure (100) according to claim 8, characterized in that, The two ends of the first side (111) are connected to the second side (112) and the third side (113) respectively through the first rounded corner (114), wherein the radius of the first rounded corner (114) is r1, and 8mm≤r1≤20mm; And / or, the ends of the second side (112) and the third side (113) away from the first side (111) are smoothly connected to the edge of the electrode body (200) through the second rounded corner (115), wherein the radius of the second rounded corner (115) is r2, and 8mm≤r2≤20mm.

10. An electrode (10), characterized in that, Includes the tab structure (100) as described in any one of claims 1 to 9.

11. A battery, characterized in that, Includes the electrode (10) as described in claim 10.

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