Tabs and batteries

Abstract

The present application relates to the field of battery energy technology, and in particular to a pole ear and a battery. The pole ear is connected to a pole piece body, and a slit is provided on the pole ear that runs through the upper and lower surfaces of the pole ear. In the width direction of the pole ear, the pole ear is provided with reinforcing ribs on both sides of the slit; the pole ear has a first area and a second area, and the first area is connected to the pole piece body and the second area on both sides of the height direction of the pole ear, respectively. The number of reinforcing ribs is multiple, and the multiple reinforcing ribs are arranged on the second area. By providing a slit on the pole ear, the pole ear is not easy to bend up after rolling, and the support force of the end of the pole ear facing the pole piece body to the end away from the pole piece body is ensured. The structural strength of the pole ear is improved by the reinforcing ribs, and it is further ensured that the pole ear is not easy to fold over. In addition, after the structural strength of the pole ear is enhanced by the reinforcing ribs, the number of slits provided on the pole ear can also be reduced, which is conducive to ensuring the flow area of ​​the pole ear.

Description

Technical Field

[0001] The present application relates to the field of battery energy technology, and in particular to a tab and a battery. Background Art

[0002] As the market demand for power and energy storage lithium-ion batteries increases, companies are continuously deepening their research on multi-electrode winding and lamination processes. Battery size design is also getting larger and larger, with lower internal resistance requirements and higher rate requirements, resulting in more and larger poles on a single cell.

[0003] At present, the battery includes stacked or wound pole pieces, which are connected to the external circuit through pole ears. During the production process, the pole pieces need to be rolled.

[0004] However, when the area of ​​the tab is large, the tab is prone to folding, affecting the performance of the battery. Utility Model Content

[0005] Based on this, the present application provides a pole ear and a battery to solve the problem in the related art that when the pole ear area is large, the pole ear is prone to folding, affecting the performance of the battery.

[0006] On the one hand, the present application provides a pole ear, which is connected to a pole piece body, and has a slit on the pole ear that runs through the upper and lower surfaces of the pole ear.

[0007] In the width direction of the pole ear, the pole ear is provided with reinforcing ribs at both sides of the slit;

[0008] The pole tab has a first region and a second region. The first region is connected to the pole piece body and the second region on both sides in the height direction of the pole tab respectively. There are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged on the second region.

[0009] In a possible implementation, the ratio of the height of the tab to the width of the tab is less than or equal to 0.7, and the number of slits N, the height H1 of the tab, and the width W1 of the tab satisfy:

[0010] When W1>35mm, N=[W1 / (5×H1)], and N is rounded down.

[0011] In a possible implementation, the width of the slit is in the range of 0.1 mm to 3 mm; and / or the distance between the edge of the tab in the width direction and the adjacent slit is greater than or equal to 5 mm; and / or,

[0012] When there are multiple slits, the interval between two adjacent slits in the width direction of the tab is greater than or equal to 8 mm.

[0013] In a possible implementation, the slit extends away from one end of the pole piece body to the edge of the pole ear, and the slit forms a first fillet at one end toward the pole piece body, and the radius R1 of the first fillet satisfies: 0.6 mm ≤ R1 ≤ 1.5 mm; and / or,

[0014] The width of the slit gradually decreases from the end of the pole ear away from the pole piece body toward the pole piece body; and / or,

[0015] The extending direction of the slit is inclined to the height direction of the tab; and / or,

[0016] A circular hole is provided on the pole ear and penetrates the pole ear. The circular hole is connected with one end of the slit facing the pole piece body. The diameter of the circular hole is 0.5mm-4mm.

[0017] In a possible implementation, the slit includes a first slit and a second slit, the first slit extends along the height direction of the pole lug, the second slit extends along the width direction of the pole lug, and one end of the first slit toward the pole piece body is connected to the middle of the second slit;

[0018] The length of the second slit is 2 mm-10 mm; and / or the width of the second slit is 1 mm-3 mm.

[0019] In a possible implementation, the height H3 of the first area satisfies:

[0020] 0.5mm≤H3≤2mm.

[0021] In a possible implementation, the reinforcing ribs include a plurality of first rib positions extending along the width direction of the pole lug and a plurality of second rib positions extending along the height direction of the pole lug, and the first rib positions are arranged crosswise with the second rib positions.

[0022] In a possible implementation, the width H4 of the first rib satisfies: 0.2 mm ≤ H4 ≤ 3 mm; and / or,

[0023] The width W3 of the second rib satisfies: 0.2 mm ≤ W3 ≤ 3 mm; and / or,

[0024] The distance H5 between the first region and the adjacent first rib, the distance H7 between the end of the pole ear away from the pole piece body and the adjacent first rib, and the distance H6 between two adjacent first ribs satisfy: H5 = H7 ≥ 0.5 × H6; and / or,

[0025] The distance W4 between two adjacent second rib positions satisfies: 2mm≤W4≤10mm.

[0026] In a possible implementation, the reinforcing ribs include a plurality of first rib positions extending along the height direction of the pole ear, a plurality of second rib positions and a plurality of third rib positions, each second rib position and each third rib position are inclined in the height direction of the pole ear, one end of each first rib position away from the pole piece body is connected to one end of a second rib position and one end of a third rib position, and a first angle is formed between the second rib position and the third rib position connected to the same first rib position.

[0027] In a possible implementation, the first angle θ satisfies:

[0028] 30°≤θ≤120°; and / or,

[0029] The distance between one end of the first rib away from the pole piece body and the first region is less than or equal to the distance between one end of the pole ear away from the pole piece body and one end of the first rib away from the pole piece body.

[0030] In a possible implementation, a second fillet is provided on both sides of one end of the pole tab facing the pole piece body in the width direction of the pole tab; and / or,

[0031] A third fillet is provided on both sides of one end of the pole tab away from the pole piece body in the width direction of the pole tab.

[0032] On the other hand, the present application also provides a battery, comprising the above-mentioned tab.

[0033] The pole ear and battery provided by the present application are connected to the pole piece body. In order to ensure the flow area of ​​the pole ear, the area of ​​the pole ear is relatively large. A slit is provided on the pole ear that runs through the upper and lower surfaces of the pole ear. When the pole ear is rolled by the roller, the tensile stress applied to the pole ear by the pole piece body is released at the slit position; the slit reduces the ratio of the width of the pole ear to the circumference of the roller, reduces the angle of the pole ear to the roller, and further reduces the centrifugal force applied to the pole ear by the roller. In this way, by providing a slit on the pole ear, the pole ear is not easy to bend up after rolling, ensuring the support force of the end of the pole ear facing the pole piece body to the end away from the pole piece body, so that the pole ear is not easy to fold. In the width direction of the pole ear, the pole ear is provided with reinforcing ribs at the positions on both sides of the slit; the pole ear has a first area and a second area, and the first area is connected to the pole piece body and the second area on both sides in the height direction of the pole ear, respectively. The number of reinforcing ribs is multiple, and the multiple reinforcing ribs are arranged on the second area. The structural strength of the pole ear is improved by the reinforcement ribs. After the pole piece is rolled, the areas on both sides of the pole ear are not easy to form crescent marks, and the areas on both sides of the pole ear are not easy to sag due to their own gravity, further ensuring that the pole ear is not easy to fold. In addition, after the structural strength of the pole ear is enhanced by the reinforcement ribs, the number of slits on the pole ear can be reduced, which is beneficial to ensure the flow area of ​​the pole ear. The first area can play a transition role. The first area can prevent the reinforcement ribs from directly contacting the pole piece body. On the one hand, the reliability of the connection between the pole ear and the pole piece body is ensured. On the other hand, it can also prevent the reinforcement ribs on the pole ear from causing the pole piece body to lose powder, thereby ensuring the performance of the pole piece body. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic diagram of the structure of a tab provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the structure of another electrode tab provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the arrangement of reinforcing ribs of a tab before die-cutting provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of another arrangement of reinforcing ribs of a tab before die-cutting provided in an embodiment of the present application;

[0039] Figure 5A schematic diagram of a first type of tab cutting provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of a second type of tab cutting provided in an embodiment of the present application;

[0041] Figure 7 A schematic diagram of a third type of tab cutting provided in an embodiment of the present application;

[0042] Figure 8 A schematic diagram of a fourth type of tab cutting provided in an embodiment of the present application;

[0043] Fig. 9 A schematic diagram of a fifth type of tab cutting provided in an embodiment of the present application;

[0044] Fig.10 A schematic diagram of a sixth type of tab cutting provided in an embodiment of the present application;

[0045] Fig.11 A schematic diagram of the seventh type of tab cutting provided in an embodiment of the present application.

[0046] Description of reference numerals:

[0047] 100-ear; 110-slit; 111-first fillet; 112-first slit; 113-second slit; 120-reinforcement rib; 121-first rib position; 122-second rib position; 123-third rib position; 130-round hole; 140-first area; 150-second area; 160-second fillet; 170-third fillet. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0052] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0053] In the prior art, in order to ensure the current flow area of ​​the pole ear, the pole ear area of ​​some batteries is relatively large. When the width of the pole ear is relatively large, during the rolling process of the pole piece, the pole ear is subjected to the centripetal force applied by the roller and the tensile stress applied by the pole piece body extending along the width direction of the pole ear. The pole ear is easily formed under the action of external force, causing the end of the pole ear away from the pole piece body to tilt upward. At this time, the end of the pole ear connected to the pole piece body reduces the support force of the end of the pole ear away from the pole piece body, causing the pole ear to be easily folded. In addition, the area of ​​the pole ear is large, and the pole ear is easily affected by its own gravity and interferes with equipment components after it collapses, resulting in the angle or folding of the pole ear. The folding of the pole ear has a great impact on the safety performance of the battery, which may cause an internal short circuit in the battery or hinder the interaction of lithium ions between the positive and negative pole sheets during battery charging, resulting in lithium deposition on the folded pole ear.

[0054] After repeated thinking and verification, the inventor found that if a slit is opened on the pole ear, the tensile stress applied to the pole ear by the pole piece body during the rolling process can be released at the slit position. At the same time, the slit reduces the ratio between the width of the pole ear and the circumference of the roller, reduces the centrifugal force applied to the pole ear by the roller, and the pole ear is not easy to form a crescent mark after rolling, which ensures the support force of the end of the pole ear connected to the pole piece body to the end of the pole ear away from the pole piece body. Reinforcement ribs can be set on the pole ear to strengthen the structural strength of the pole ear, and the pole ear is not easy to fall due to its own gravity. By setting the position of the reinforcement rib, the structural strength of the pole ear is reliably improved, and the reinforcement ribs are prevented from affecting the connection between the pole ear and the pole piece body and affecting the performance of the pole piece body. In this way, the reinforcement ribs and slits can make the pole ear less likely to fold. The structural strength of the pole ear is enhanced, and the pole ear is less likely to form a crescent mark after rolling, which is conducive to reducing the number of slits and ensuring the flow area of ​​the pole ear.

[0055] In view of this, the inventor has designed a pole ear and a battery. The slits opened on the pole ear release the tensile stress applied to the pole ear by the pole piece body and reduce the centrifugal force applied to the pole ear by the roller. The pole ear is not easy to form a crescent mark after rolling, which ensures the support force of the end of the pole ear connected to the pole piece body to the end of the pole ear away from the pole piece body. In the width direction of the pole ear, the pole ear is respectively provided with reinforcing ribs at the positions on both sides of the slit. The number of reinforcing ribs is multiple, and there is a gap between each reinforcing rib and the pole piece body. The structural strength of the pole ear is enhanced by providing reinforcing ribs on the pole ear. The pole ear is not easy to collapse due to its own gravity. At the same time, the reinforcing ribs will not affect the connection between the pole ear and the pole piece body, and the reinforcing ribs will not affect the performance of the pole piece body. The slits and reinforcing ribs make the pole ear less likely to fold. At the same time, the reinforcing ribs on the pole ear are also conducive to reducing the number of slits and ensuring the flow area of ​​the pole ear.

[0056] The following is a detailed description of the technical solution of the tab and battery provided in the embodiment of the present application in conjunction with the accompanying drawings. The width direction of the tab 100 is the direction indicated by the X axis in the accompanying drawings, and the height direction of the tab 100 is the direction indicated by the Y axis in the accompanying drawings. During the rolling process of the pole piece, the width direction of the tab 100 is perpendicular to the axis of the roller.

[0057] Reference Figure 1-Figure 4 As shown, the pole tab 100 provided in the embodiment of the present application is connected to the pole piece body, and a slit 110 is provided on the pole tab 100, which runs through the upper and lower surfaces of the pole tab 100. In the width direction of the pole tab 100, the pole tab 100 is provided with reinforcing ribs 120 at the positions on both sides of the slit 110. The pole tab 100 has a first area 140 and a second area 150, and the first area 140 is connected to the pole piece body and the second area 150 on both sides in the height direction of the pole tab 100. There are multiple reinforcing ribs 120, and multiple reinforcing ribs 120 are arranged on the second area 150.

[0058] It should be noted that if Figure 1 and Figure 2 As shown, the bottom end of the pole lug 100 is connected to the pole piece body. Exemplarily, the pole lug 100 may be a metal sheet structure, and the pole lug 100 may be connected to the current collector of the pole piece body by welding. Among them, the upper and lower surfaces of the pole lug 100 are two surfaces opposite to each other in the thickness direction of the pole lug 100, that is, the slit 110 passes through the pole lug 100 along the thickness direction of the pole lug 100. Optionally, the slit 110 may be opened on the pole lug 100 by laser cutting. In the process of rolling the pole lug 100, the slit 110 may release the tensile stress applied to the pole lug 100 by the pole piece body.

[0059] Optional, such as Figure 5 As shown, the distance H2 between the bottom end of the slit 110 and the bottom end of the pole lug 100 and the height H1 of the pole lug 100 satisfy: 1 / 6H1<H2<4 / 5H1. Among them, H2 can be equal to 1 / 5H1, 1 / 3H1 or 1 / 2H1, etc., and is not limited here. Exemplarily, when the width of the pole lug 100 is 45mm and the height of the pole lug 100 is 8mm, the distance H2 between the bottom end of the slit 110 and the bottom end of the pole lug 100 can be 3mm. The above-mentioned arrangement ensures that the slit 110 can effectively release stress, thereby reliably improving the folding of the pole piece. At the same time, in the process of opening the slit 110, the heat generated during the processing is not easily transferred to the pole piece body, thereby ensuring the performance of the pole piece body.

[0060] During the processing of the tab 100, the reinforcing rib 120 may be first processed on the tab 100, and then the tab 100 with the reinforcing rib 120 may be cut to form the slit 110 on the tab 100. In a possible implementation, the reinforcing rib 120 may be formed on the tab 100 by stamping. After the tab 100 is stamped, a protrusion is formed on one side of the tab 100, and a groove is formed on the other side of the tab 100. The position of the protrusion is opposite to the position of the groove, and the protrusion and the groove together form the reinforcing rib 120 on the tab 100. After the reinforcing rib 120 is formed on the tab 100, compared with the planar tab in the related art, the tab 100 has a higher structural strength, that is, the tab 100 has a stronger ability to resist external forces, and the tab 100 is not easily deformed under the action of external forces.

[0061] Optionally, the thickness of the reinforcing rib 120 is 50 μm-300 μm. When the reinforcing rib 120 is formed on the tab 100 by stamping, the depth of the stamping, i.e., the depth of the groove on one side of the tab 100, is 50 μm-300 μm. The thickness of the reinforcing rib 120 can greatly improve the structural strength of the tab 100 while ensuring that the tab 100 will not be damaged during the processing of the reinforcing rib 120.

[0062] Exemplarily, when there is one slit 110 , the slit 110 may be disposed in the middle of the tab 100 in the width direction of the tab 100 ; when there are multiple slits 110 , the multiple slits 110 may be evenly arranged on the tab 100 in the width direction of the tab 100 .

[0063] like Figure 1 and Figure 2 As shown, when the number of the slit 110 is one, the area of ​​the tab 100 located on the left side of the slit 110 and the area of ​​the tab 100 located on the right side of the slit 110 are both provided with reinforcing ribs 120 .

[0064] in, Figure 3 and Figure 4 A is the pole piece body, the top of the first area 140 is connected to the second area 150, and the bottom of the first area 140 is connected to the pole piece body. A plurality of reinforcing ribs 120 can be evenly arranged on the second area 150, thereby improving the structural strength of the pole piece in the second area 150.

[0065] The present embodiment does not limit the number of reinforcing ribs 120, and those skilled in the art can set them according to actual needs. Multiple reinforcing ribs 120 can be arranged on the tab 100 in a tic-tac-toe shape, a Y shape, or a cross shape, or multiple reinforcing ribs 120 can be arranged on the tab 100 in parallel with each other, and this embodiment does not make the sole limitation here.

[0066] The pole tab 100 provided in this embodiment is connected to the pole piece body. To ensure the flow area of ​​the pole tab 100, the area of ​​the pole tab 100 is relatively large. The pole tab 100 is provided with a slit 110 penetrating the upper and lower surfaces of the pole tab 100. When the pole tab 100 is rolled by a roller, the tensile stress applied to the pole tab 100 by the pole piece body is released at the position of the slit 110; the slit 110 reduces the ratio of the width of the pole tab 100 to the circumference of the roller, reduces the wrap angle of the pole tab 100 to the roller, and further reduces the centrifugal force applied to the pole tab 100 by the roller. In this way, by providing the slit 110 on the pole tab 100, the pole tab 100 is not easy to bend up after rolling, and the support force of the end of the pole tab 100 facing the pole piece body to the end away from the pole piece body is ensured, so that the pole tab 100 is not easy to bend. In the width direction of the pole tab 100, the pole tab 100 is provided with reinforcing ribs 120 at the positions on both sides of the slit 110; the pole tab 100 has a first area 140 and a second area 150, and the first area 140 is connected to the pole piece body and the second area 150 on both sides in the height direction of the pole tab 100, and the number of reinforcing ribs 120 is multiple, and multiple reinforcing ribs 120 are arranged on the second area 150. The structural strength of the pole tab 100 is improved by the reinforcing ribs 120. After the pole piece is rolled, the areas of the pole tab 100 on both sides of the slit 110 are not easy to form crescent marks, and the areas of the pole tab 100 on both sides of the slit 110 are not easy to collapse due to their own gravity, further ensuring that the pole tab 100 is not easy to fold. In addition, after the structural strength of the pole tab 100 is enhanced by the reinforcing ribs 120, the number of slits 110 opened on the pole tab 100 can also be reduced, which is conducive to ensuring the flow area of ​​the pole tab 100. The first region 140 can play a transition role. The first region 140 can prevent the reinforcing rib 120 from directly contacting the pole piece body. On the one hand, the reliability of the connection between the pole ear 100 and the pole piece body is ensured. On the other hand, the reinforcing rib 120 on the pole ear 100 can be prevented from causing the pole piece body to lose powder, thereby ensuring the performance of the pole piece body.

[0067] Schematically, the ratio between the height of the tab 100 and the width of the tab 100 is less than or equal to 0.7. The number N of the slits 110, the height H1 of the tab 100, and the width W1 of the tab 100 satisfy:

[0068] When W1>35mm, N=[W1 / (5×H1)], and N is rounded down.

[0069] For example, when the width of the tab 100 is 45 mm and the height of the tab 100 is 6 mm, the number of the slits 110 may be 1. When the width of the tab 100 is 60 mm and the height of the tab 100 is 6 mm, the number of the slits 110 may be 2. When W1 is less than or equal to 35 mm, N=0, that is, the tab 100 may not have a slit 110.

[0070] When the width of the tab 100 exceeds 35 mm, the area on the tab 100 that needs to release stress becomes larger, and at least one slit 110 is required to completely release the stress to ensure that the tab 100 is not prone to folding.

[0071] In one possible implementation, Figure 5 As shown, the width W2 of the slit 110 is in the range of 0.1 mm to 3 mm.

[0072] Exemplarily, the width W2 of the slit 110 may be 0.1 mm, 1 mm, 2 mm or 3 mm, etc., which is not limited here. For example, when the width of the tab 100 is 45 mm and the height of the tab 100 is 15 mm, the width W2 of the slit 110 may be 0.5 mm-2 mm.

[0073] When W2 is less than 0.1 mm, the width of the slit 110 is too narrow, the difficulty of processing the slit 110 increases, and the processing cost of the pole lug 100 is high; when W2 is greater than 3 mm, the width of the slit 110 is too wide, the slit 110 affects the total area of ​​the pole lug 100, resulting in a decrease in the flow area of ​​the pole lug 100 and increased difficulty in welding between different pole lugs 100.

[0074] With this structure, the slit 110 can be easily opened on the tab 100 , while ensuring the current flow effect of the tab 100 and the welding process of the tab 100 .

[0075] like Figure 5 As shown, the distance W5 between the edge of the tab 100 in the width direction and the adjacent slit 110 is greater than or equal to 5 mm.

[0076] For example, W5 can be 5 mm, 10 mm or 15 mm, etc. Those skilled in the art can set the specific size of W5 according to the width of the tab 100, which is not limited here. Through the above setting, it is avoided that the width of the area between the edge of the tab 100 in the width direction and the adjacent slit 110 is too narrow to affect the processing of the slit 110, and at the same time, it is ensured that the area between the edge of the tab 100 in the width direction and the adjacent slit 110 is not easily deformed due to the opening of the slit 110.

[0077] like Figure 5 As shown, when there are multiple slits 110, the interval W6 between two adjacent slits 110 in the width direction of the tab 100 is greater than or equal to 8 mm.

[0078] Specifically, W6 may be 8 mm, 10 mm, or 12 mm, etc., and those skilled in the art may set the specific size of W6 according to the width of the tab 100. When the interval between two adjacent slits 110 in the width direction of the tab 100 is less than 8 mm, the distance between the two adjacent slits 110 is too close, and in the process of opening the slits 110, the area of ​​the tab 100 between the two slits 110 is prone to cracking and deformation. In other words, W6 ≥ 8 mm can effectively prevent the tab 100 from cracking and deformation in the area between the two slits 110.

[0079] In one embodiment, Figure 1-Figure 9 As shown, the slit 110 extends from one end of the pole piece body to the edge of the pole ear 100 .

[0080] Exemplarily, the slits 110 may form a strip structure, and the length direction of the strip structure may be parallel to the height direction of the tab 100 or may be inclined to the height direction of the tab 100 .

[0081] The above arrangement facilitates the processing of the slit 110 . Specifically, the slit 110 can be formed by cutting inward from the edge of the tab 100 by laser cutting.

[0082] like Figure 5 As shown, the end of the cut 110 facing the pole piece body forms a first fillet 111, and the radius R1 of the first fillet 111 satisfies: 0.6mm≤R1≤1.5mm.

[0083] The radius R1 of the first fillet 111 can be 0.6mm, 1mm, 1.2mm or 1.5mm, etc., and is not limited here. When R1 is less than 0.6mm, when the pole tab 100 is subjected to the tensile stress of the pole piece body, the pole tab 100 is prone to tearing at the position of the slit 110 facing one end of the pole piece body; when R1 is greater than 1.5mm, the area of ​​the slit 110 is larger, affecting the flow area of ​​the pole tab 100. In other words, the above arrangement ensures that the pole tab 100 is not prone to tearing when subjected to tensile stress, while ensuring the flow area of ​​the pole tab 100.

[0084] like Figure 6 As shown, in a possible implementation, the width of the slit 110 gradually decreases from the end of the pole ear 100 away from the pole piece body toward the pole piece body.

[0085] That is to say, the width of the slit 110 gradually decreases from top to bottom. It is worth mentioning that during the process of opening the slit 110 of the tab 100, the tab 100 is synchronously driven by the transmission mechanism to move. For example, if the slit 110 is opened by laser cutting, the laser does not need to move along the movement direction of the tab 100, which facilitates opening the slit 110 on the tab 100. In addition, the area of ​​the slit 110 is small, which is conducive to increasing the flow area of ​​the tab 100.

[0086] like Figure 7 As shown, in a possible implementation, the extending direction of the slit 110 is inclined to the height direction of the tab 100 .

[0087] Through the above arrangement, it is convenient to open the slit 110 on the tab 100 during the movement of the tab 100 .

[0088] like Figure 8 As shown, a circular hole 130 penetrating the pole ear 100 is provided on the pole ear 100 , and the circular hole 130 is connected to one end of the slit 110 facing the pole piece body, and the diameter of the circular hole 130 is 0.5 mm-4 mm.

[0089] Exemplarily, the slit 110 and the circular hole 130 can be opened on the pole lug 100 by laser cutting. By setting the circular hole 130 as above, it is avoided that the laser cutting reaches the end of the slit 110 facing the pole piece body without cutting off the pole lug 100. The laser cutting to the end of the slit 110 facing the pole piece body can be smoother, and the burrs generated at the end of the slit 110 facing the pole piece body can be reduced. Exemplarily, the diameter of the circular hole 130 can be 0.5mm, 1.5mm, 3mm or 4mm, etc., which is not limited here. When the diameter of the circular hole 130 is less than 0.5mm, the cutting is more difficult; when the diameter of the circular hole 130 is greater than 4mm, the welding process and the overcurrent effect of the pole lug 100 are affected. In other words, the diameter of the circular hole 130 makes the circular hole 130 easy to process while ensuring the welding process and the overcurrent effect of the pole lug 100.

[0090] In a specific embodiment, Fig. 9 As shown, the slit 110 includes a first slit 112 and a second slit 113. The first slit 112 extends along the height direction of the pole tab 100, and the second slit 113 extends along the width direction of the pole tab 100. One end of the first slit 112 toward the pole piece body is connected to the middle of the second slit 113.

[0091] The first slit 112 extends away from one end of the pole piece body to the edge of the pole ear 100. Schematically, the first slit 112 and the second slit 113 form an approximate "T"-shaped structure, the top of the "T"-shaped structure faces the pole piece body, and the bottom of the "T"-shaped structure extends to the edge of the pole ear 100.

[0092] During the process of rolling the pole piece, the second slit 113 is provided to release more stress, so that the slit 110 can further reliably improve the folding of the pole tab 100 .

[0093] Schematically, the length of the second slit 113 is 2mm-8mm. The length of the second slit 113 is the size of the second slit 113 in the direction indicated by the X-axis. For example, the length of the second slit 113 can be 3mm, 5mm, 7mm, etc., which is not limited here. When the length of the second slit 113 is less than 2mm, the improvement effect of the second slit 113 on stress release is small; when the length of the second slit 113 is greater than 8mm, the second slit 113 causes the tab 100 to lose more area, affecting the current carrying capacity of the tab 100.

[0094] Schematically, the width of the second slit 113 is 1mm-3mm. The width of the second slit 113 is the size of the second slit 113 in the direction indicated by the Y axis. For example, the width of the second slit 113 can be 1mm, 2mm or 3mm, etc., which is not limited here. When the width of the second slit 113 is less than 1mm, the improvement effect of the second slit 113 on stress release is small; when the width of the second slit 113 is greater than 3mm, the second slit 113 causes the tab 100 to lose more area, affecting the current carrying capacity of the tab 100.

[0095] The above arrangement ensures that the second slit 113 can release more stress of the tab 100 , while ensuring the area of ​​the tab 100 to ensure the current flow capacity of the tab 100 .

[0096] In another possible implementation, Fig.10 and Fig.11 As shown, there is a gap between the end of the slit 110 away from the pole piece body and the edge of the pole lug 100. In other words, the end of the slit 110 away from the pole piece body does not extend to the edge of the pole lug 100. The shape of the slit 110 can be a suitable shape such as a rectangle, a circle or a triangle, which is not limited here.

[0097] It can be understood that the slit 110 does not extend to the edge of the tab 100 , that is, the cut area of ​​the tab 100 is small, so that the area of ​​the tab 100 is larger, which is beneficial to improving the flow area and flow capacity of the tab 100 .

[0098] like Fig.10 As shown, the interval H8 between the end of the slit 110 away from the pole piece body and the edge of the pole tab 100 is less than half of the height H1 of the pole tab 100. H8<1 / 2H1 can ensure that the slit 110 can reliably improve the folding of the pole piece.

[0099] In one embodiment, Figure 3 As shown, the height H3 of the first region 140 satisfies: 0.5 mm≤H3≤2 mm.

[0100] The height H3 of the first region 140 may be 0.5 mm, 1 mm or 2 mm, etc., and is not limited here. When the height H3 of the first region 140 is less than 0.5 mm, the reinforcing rib 120 on the tab 100 may contact the pole piece body due to processing tolerance, affecting the performance of the pole piece body; when the height H3 of the first region 140 is greater than 2 mm, the area of ​​the tab 100 where the reinforcing rib 120 is provided, i.e., the second region 150, is small, and the reinforcing rib 120 has little effect on improving the structural strength of the tab 100.

[0101] The above arrangement ensures that the reinforcing rib 120 improves the structural strength of the pole lug 100 while preventing the reinforcing rib 120 from affecting the pole piece body, thereby ensuring the performance of the pole piece body.

[0102] like Figure 3 As shown, the reinforcing ribs 120 include a plurality of first ribs 121 extending along the width direction of the tab 100 and a plurality of second ribs 122 extending along the height direction of the tab 100 , and the first ribs 121 and the second ribs 122 are arranged crosswise.

[0103] Schematically, each first rib 121 crosses the second rib 122, the extension direction of the first rib 121 is perpendicular to the extension direction of the second rib 122, and a plurality of first ribs 121 and a plurality of second ribs 122 are arranged in a mesh on the tab 100. Optionally, the width of the first rib 121 does not exceed the width of the second rib 122. The reinforcing ribs 120 are arranged in a mesh on the tab 100, so that the structural strength of the tab 100 is reliably improved.

[0104] Schematically, the width H4 of the first rib position 121 satisfies: 0.2mm≤H4≤3mm. Among them, the width H4 of the first rib position 121 can be 0.2mm, 1mm, 2mm or 3mm, etc., and is not limited here. When the width H4 of the first rib position 121 is less than 0.2mm, the first rib position 121 has little effect on improving the structural strength of the pole tab 100; when the width H4 of the first rib position 121 is greater than 3mm, the first rib position 121 will affect the welding effect between different pole tabs 100. That is, the above-mentioned setting ensures that the first rib position 121 can reliably improve the structural strength of the pole tab 100, and at the same time, the first rib position 121 on the pole tab 100 will not affect the welding between different pole tabs 100.

[0105] Schematically, the width W3 of the second rib 122 satisfies: 0.2 mm ≤ W3 ≤ 3 mm. The width W3 of the second rib 122 can be 0.2 mm, 1 mm, 2 mm or 3 mm, etc., which is not limited here. The width of the second rib 122 ensures that the second rib 122 can reliably improve the structural strength of the tab 100, and the second rib 122 on the tab 100 will not affect the welding between different tabs 100.

[0106] like Figure 3 As shown, the distance H5 between the first region 140 and the adjacent first rib 121, the distance H7 between the end of the pole ear 100 away from the pole piece body and the adjacent first rib 121, and the distance H6 between two adjacent first ribs 121 satisfy: H5=H7≥0.5×H6.

[0107] When H5 or H7 is less than 0.5×H6, the first rib 121 at the edge is close to the edge of the second area 150. During the processing of the first rib 121, the area between the edge of the second area 150 and the outermost first rib 121 of the tab 100 is prone to deformation, affecting the performance of the battery.

[0108] Optionally, H5=H7≤1 / 2H1, ensuring that the first ribs 121 are not too sparse and that the distribution of the first ribs 121 on the tab 100 is not too sparse, ensuring that the first ribs 121 can reliably improve the structural strength of the tab 100 .

[0109] Please continue reading Figure 3 , the distance W4 between two adjacent second rib positions 122 satisfies: 2mm≤W4≤10mm.

[0110] Among them, W4 can be 2mm, 6mm, 8mm or 10mm, etc., which is not limited here. The above configuration ensures that the arrangement of the plurality of second ribs 122 on the tab 100 is neither too sparse nor too dense, and the plurality of second ribs 122 can reliably improve the structural strength of the tab 100 without causing a significant impact on the welding between different tabs 100.

[0111] like Figure 4 As shown, in one embodiment, the reinforcing rib 120 includes a plurality of first rib positions 121, a plurality of second rib positions 122 and a plurality of third rib positions 123 extending along the height direction of the pole lug 100, each second rib position 122 and each third rib position 123 are inclined in the height direction of the pole lug 100, and one end of each first rib position 121 away from the pole piece body is connected to one end of a second rib position 122 and one end of a third rib position 123, and a first angle is formed between the second rib position 122 and the third rib position 123 connected to the same first rib position 121.

[0112] It can be understood that a "Y"-shaped structure is formed between the interconnected first ribs 121, the second ribs 122, and the third ribs 123, and the bottom end of the "Y"-shaped structure faces the pole piece body. Among them, the bottom end of the first rib 121 extends to the bottom edge of the second area 150, and the top ends of the second ribs 122 and the third ribs 123 extend to the top edge of the second area 150. In this structure, multiple first ribs 121, multiple second ribs 122, and multiple third ribs 123 are arranged in a "Y" shape in the second area 150, which effectively improves the structural reliability of the pole lug 100.

[0113] Indicatively, the first angle θ satisfies: 30°≤θ≤120°

[0114] Wherein, θ can be 30°, 60°, 90° or 120°, etc., and is not limited here. 30°≤θ≤120° can ensure that the second rib position 122 and the third rib position 123 have a large angle with the folding reference line of the tab 100, and the extension direction of the folding reference line is perpendicular to the projection direction of the resultant force on the tab 100 during rolling in the plane of the tab 100, effectively improving the anti-folding effect of the tab 100.

[0115] Optional, such as Figure 4 As shown, the distance H9 between the end of the first rib 121 away from the pole piece body and the first region 140 is less than or equal to the distance H10 between the end of the pole ear 100 away from the pole piece body and the end of the first rib 121 away from the pole piece body.

[0116] Through the above-mentioned arrangement, the arrangement areas of the second rib position and the third rib position occupy a larger area on the pole lug. Since the second rib position 122 and the third rib position 123 are respectively in a non-parallel state with the folding reference line of the pole lug 100, the first rib position 121, the second rib position 122 and the third rib position 123 can effectively improve the anti-folding effect of the pole lug 100.

[0117] like Figure 1 , Figure 2 , Figure 5-Figure 11 As shown, the end of the pole lug 100 facing the pole piece body is provided with second fillets 160 on both sides in the width direction of the pole lug 100, specifically, the left and right sides of the end where the pole lug 100 is connected to the pole piece body are provided with second fillets 160, and the second fillets 160 can be formed on the pole lug 100 by laser cutting, for example. For example, the radius of the second fillet 160 ranges from 0.5 mm to 5 mm, and specifically, the radius of the second fillet 160 can be set according to the height and width of the pole lug 100.

[0118] like Figure 1 , Figure 2 , Figure 5-Figure 11As shown, third fillets 170 are respectively provided on both sides of the end of the pole tab 100 away from the pole piece body in the width direction of the pole tab 100 .

[0119] Exemplarily, a third fillet 170 is provided on the left and right sides of the top of the pole lug 100 respectively. The third fillet 170 can be formed on the pole lug 100 by laser cutting. The radius of the third fillet 170 ranges from 0.5mm to 5mm. Specifically, the radius of the third fillet 170 can be set according to the height and width of the pole lug 100.

[0120] This structure forms a second fillet 160 and / or a third fillet 170 on the tab 100 . The second fillet 160 and / or the third fillet 170 can reduce the resistance of the tab 100 during movement, and further reduce the probability of the tab 100 folding.

[0121] The present application also provides a battery, comprising the above-mentioned tab 100 .

[0122] The battery has a positive electrode sheet and a negative electrode sheet, and the positive electrode tab 100 of the positive electrode sheet and / or the negative electrode tab 100 of the negative electrode sheet are the above-mentioned tabs 100 .

[0123] The battery provided in the present application adopts the above-mentioned pole tab 100, so the pole tab 100 is not easy to be folded, and the safety performance of the battery is higher.

[0124] 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 it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tab, characterized in that: The pole ear is connected to the pole piece body, and a slit is provided on the pole ear that passes through the upper and lower surfaces of the pole ear. In the width direction of the pole ear, the pole ear is provided with reinforcing ribs at positions on both sides of the slit; The pole lug has a first region and a second region, the first region is connected to the pole piece body and the second region on both sides of the pole lug in the height direction, and the number of the reinforcing ribs is multiple, and the multiple reinforcing ribs are arranged on the second region.

2. The tab according to claim 1, characterized in that: The ratio of the height of the tab to the width of the tab is less than or equal to 0.7, and the number of slits N, the height H1 of the tab, and the width W1 of the tab satisfy: When W1>35mm, N=[W1 / (5×H1)], and N is rounded down.

3. The tab according to claim 2, characterized in that: The width of the slit is in the range of 0.1 mm to 3 mm; and / or, The distance between the edge of the tab in the width direction and the adjacent slit is greater than or equal to 5 mm; and / or, When there are multiple slits, the interval between two adjacent slits in the width direction of the tab is greater than or equal to 8 mm.

4. The tab according to claim 1, characterized in that: The slit extends away from one end of the pole piece body to the edge of the pole ear, and the slit forms a first fillet toward one end of the pole piece body, and the radius R1 of the first fillet satisfies: 0.6mm≤R1≤1.5mm; and / or, The width of the slit gradually decreases from the end of the pole ear away from the pole piece body toward the pole piece body; and / or, The extending direction of the slit is inclined to the height direction of the tab; and / or, A circular hole penetrating the pole ear is provided on the pole ear, the circular hole is connected with one end of the slit facing the pole piece body, and the diameter of the circular hole is 0.5 mm-4 mm.

5. The tab according to claim 4, characterized in that: The slits include a first slit and a second slit, wherein the first slit extends along the height direction of the pole lug, and the second slit extends along the width direction of the pole lug, and one end of the first slit toward the pole piece body is connected to the middle of the second slit; The length of the second slit is 2 mm-10 mm; and / or the width of the second slit is 1 mm-3 mm.

6. The tab according to claim 1, characterized in that: The height H3 of the first area satisfies: 0.5mm≤H3≤2mm.

7. The tab according to claim 1, characterized in that: The reinforcing ribs include a plurality of first rib positions extending along the width direction of the pole lug and a plurality of second rib positions extending along the height direction of the pole lug, and the first rib positions are arranged crosswise with the second rib positions.

8. The electrode tab according to claim 7, characterized in that: The width H4 of the first rib satisfies: 0.2 mm ≤ H4 ≤ 3 mm; and / or, The width W3 of the second rib satisfies: 0.2 mm ≤ W3 ≤ 3 mm; and / or, The distance H5 between the first region and the adjacent first rib position, the distance H7 between the end of the pole ear away from the pole piece body and the adjacent first rib position, and the distance H6 between two adjacent first rib positions satisfy: H5=H7≥0.5×H6; and / or, A distance W4 between two adjacent second rib positions satisfies: 2mm≤W4≤10mm.

9. The tab according to claim 1, characterized in that: The reinforcing ribs include a plurality of first rib positions extending along the height direction of the pole lug, a plurality of second rib positions and a plurality of third rib positions, each of the second rib positions and each of the third rib positions are inclined to the height direction of the pole lug, one end of each of the first rib positions away from the pole piece body is connected to one end of the second rib position and one end of the third rib position, and a first angle is formed between the second rib position and the third rib position connected to the same first rib position.

10. The electrode tab according to claim 9, characterized in that: The first angle θ satisfies: 30°≤θ≤120°; and / or, The distance between one end of the first rib away from the pole piece body and the first region is less than or equal to the distance between one end of the pole ear away from the pole piece body and one end of the first rib away from the pole piece body.

11. The electrode tab according to any one of claims 1 to 10, characterized in that: The end of the pole ear facing the pole piece body is provided with second fillets on both sides in the width direction of the pole ear; and / or, The end of the pole tab away from the pole piece body is provided with third fillets on both sides in the width direction of the pole tab.

12. A battery, characterized in that: The present invention comprises the electrode tab as described in any one of claims 1 to 11.

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