A tab and a lithium battery pole piece

Abstract

The utility model provides a kind of tab, comprising: main body area, it is plane-like;Reinforcement area, it is wavelike along the length direction of tab, the surface of reinforcement area has arc wrinkle, arc wrinkle is outward protruding relative to the surface of reinforcement area and extend along the width direction of tab.Adopt above-mentioned technical scheme, the overall strength of tab is significantly improved, this can effectively avoid the problem that tab appears to collapse, wrinkle even breakage in the process of core stacking.On the one hand, it can reduce the operation of subsequent manual re-investment, save production time;On the other hand, it can guarantee the consistency of tab form, provide stable foundation for subsequent ultrasonic welding, so as to improve welding quality and production efficiency, and ensure that the battery prepared finally has stable quality and electrical performance.The utility model further provides a kind of lithium battery pole piece.The lithium battery pole piece includes pole piece body and the above-mentioned tab, and the tab is located at one side of the pole piece body.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a tab and a lithium battery electrode. Background Technology

[0002] In lithium-ion battery production, stacking technology is a core element affecting battery performance and production efficiency. As the core structure formed by stacking electrodes and separators within the cell, the stability of the stack directly impacts the battery's energy density, cycle life, and safety. Typically, after stacking and before packaging, the dispersed tabs are gathered, aligned, and ultrasonically welded using mechanical or manual methods. This ensures good contact and a strong connection during subsequent welding to terminals, busbars, etc., avoiding incomplete or missed welds, and reducing gaps between tabs to lower internal resistance. However, in actual production, the foil used for the tabs is relatively thin, making them prone to collapse during stacking. This problem directly leads to wrinkles or even damage to the tabs during subsequent assembly, affecting battery performance and quality. To address this defect, production lines usually require manual re-inspection and reorganization of the tabs. However, this process is not only time-consuming and labor-intensive, but repeated operations can also cause the stacked cores to soften, further affecting product stability. Utility Model Content

[0003] The present invention provides the following technical solutions to solve the above-mentioned technical problems.

[0004] This utility model provides a tab, comprising:

[0005] The main area is planar;

[0006] The reinforcing region is wavy along the length of the tab, and the surface of the reinforcing region has arc-shaped folds that bulge outward relative to the surface of the reinforcing region and extend along the width of the tab.

[0007] By adopting the above technical solution, the overall strength of the tabs is significantly improved, which can effectively avoid problems such as tab collapse, wrinkling, or even damage during the stacking process. On the one hand, it can reduce subsequent manual re-injection operations and save production time; on the other hand, it can ensure the consistency of the tab shape, providing a stable foundation for subsequent ultrasonic welding, thereby improving welding quality and production efficiency, while ensuring that the final battery has stable quality and electrical performance.

[0008] According to another specific embodiment of the present invention, the arc-shaped folds are axially symmetrical about the centerline of the tab in the width direction.

[0009] According to another specific embodiment of the present invention, there are multiple arc-shaped folds, and the multiple arc-shaped folds are distributed at equal intervals along the length direction.

[0010] According to another specific embodiment of the present invention, there are multiple arc-shaped folds, and the angle between the tangent direction at any point on the arc-shaped fold and the plane where the main body area is located is 10°-30°.

[0011] According to another specific embodiment of the present invention, the wavy curve is a sine curve.

[0012] According to another specific embodiment of the present invention, the horizontal projection length of the sine curve within one period is 4-6 mm.

[0013] According to another specific embodiment of the present invention, the horizontal distance between adjacent peaks and troughs of the sine curve within one cycle is 2-3 mm.

[0014] According to another specific embodiment of the present invention, the amplitude of the sine curve is 2-4 mm.

[0015] This utility model also provides a lithium battery electrode, including an electrode body and a tab as described in any of the above embodiments, wherein the tab is located on one side of the electrode body.

[0016] By adopting the above technical solution, the lithium battery electrode provided by this utility model can effectively enhance the electrode's resistance to deformation by using the electrode tab with the above-mentioned reinforced area, thereby reducing problems such as collapse and wrinkles, reducing manual rework costs, and improving production efficiency; at the same time, it can also ensure the quality and consistency of ultrasonic welding, optimize the battery's electrical performance and safety, and the process is simple and suitable for large-scale production.

[0017] According to another specific embodiment of the present invention, the reinforcing region is located on the side away from the electrode body, relative to the main body region. Attached Figure Description

[0018] Figure 1 This diagram shows a three-dimensional structural schematic of the tab and a body containing part of the electrode sheet in one embodiment of the present invention.

[0019] Figure 2 This is a top view showing the electrode tab and a body containing part of the electrode sheet in one embodiment of the present invention;

[0020] Figure 3 This diagram shows a side view of the electrode tab and a body containing a portion of the electrode sheet in one embodiment of the present invention. Figure 1 ;

[0021] Figure 4 This invention shows a side view of the electrode tab and a body containing a portion of the electrode sheet in one embodiment of the present invention. Figure 2 ;

[0022] Figure 5 Show Figure 4Enlarged view of part C in the middle Figure 1 ;

[0023] Figure 6 Show Figure 4 Enlarged view of part C in the middle Figure 2 ;

[0024] Figure 7 A three-dimensional structural schematic diagram of the upper pressure block provided by this utility model is shown;

[0025] Figure 8 This diagram shows a three-dimensional structural schematic of the improved pressing block of this invention.

[0026] (Symbol Explanation)

[0027] 1-Main body area, 2-Reinforcement area, 3-Arc-shaped fold, 4-Part of the electrode body, 5-Upper pressure block, 6-Lower pressure block, 10-Electrode, d1-Horizontal projection length of the sine curve in one period, d2-Horizontal distance between adjacent peaks and troughs, B-Axis, A-Amplitude, X-Length direction, Y-Width direction. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0029] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0030] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0032] Reference Figures 1-2 and combined Figure 5 This utility model provides a tab 10, comprising:

[0033] Main area 1 is planar;

[0034] Reinforcement region 2, along the length direction of the tab (e.g.) Figure 1 , Figures 3-4 The surface of the reinforcing region 2 (in the X direction) is wavy, and the surface of the reinforcing region 2 has arc-shaped folds 3. The arc-shaped folds 3 protrude outward relative to the surface of the reinforcing region 2 and are along the width direction of the tab 10 (e.g., in the X direction). Figure 1 (Extends in the Y direction).

[0035] The present invention provides a reinforcing zone 2 on the tab 10, which can significantly improve the strength of the tab 10. Specifically, the wavy structure along the length direction X can enhance the deformation resistance of the tab 10 in the length direction X, while the arc-shaped pleats 3 in the width direction Y can strengthen its structural stability in the width direction Y. Moreover, the combination of the wavy structure and the arc-shaped pleats 3 forms a "synergistic enhancement effect", that is, the combination of the arc-shaped pleats 3 and the wavy line makes the overall strength of the tab 10 not a simple superposition of the arc-shaped pleats 3 or the wavy structure alone, but much greater than such a superposition effect, achieving a strength effect of 1+1>2.

[0036] Because the overall strength of tab 10 is significantly improved, it can effectively avoid problems such as collapse, wrinkling, or even damage to tab 10 during the stacking process. On the one hand, it can reduce the subsequent manual re-stitching operation and save production time; on the other hand, it can ensure the consistency of tab 10 shape, provide a stable foundation for subsequent ultrasonic welding, thereby improving welding quality and production efficiency, while ensuring that the final battery has stable quality and electrical performance.

[0037] In addition, this utility model also provides a pressing block for forming the aforementioned reinforcing zone 2. For example... Figures 7-8 As shown, the pressing block consists of an upper pressing block 5 and a lower pressing block 6. During operation, the tab 10 is simply placed between the upper pressing block 5 and the lower pressing block 6. Since the pressing block has wavy protrusions and indentations that match the wavy structure and arc-shaped folds 3 in the reinforcing area 2 of the tab 10, the arc-shaped folds 3 and wavy structure can be pressed out in one go by applying pressure, thereby quickly forming the required reinforcing area 2. In particular, to avoid damage to the tab 10 by the pressing block, the bottom of the upper pressing block 5 and the top of the lower pressing block 6 are chamfered at all four corners. This design can effectively protect the edges of the tab 10 from extrusion damage and ensure efficient forming of the required reinforcing area 2.

[0038] Furthermore, in the above embodiments, reference is made to Figures 1-2 The arc-shaped fold 3 about the midline of the tab 10 in the width direction Y (e.g.) Figure 1The dotted line B) in the figure is axially symmetrical. This symmetrical design not only ensures that the tab 10 is subjected to uniform force and stable strength in the width direction Y, but also adapts to the structure of the pressing block, making it easy to press and form in one go through the pressing block mold, thereby improving the production efficiency and process simplicity of the reinforcing zone 2.

[0039] Furthermore, in the above embodiments, there are multiple arc-shaped folds 3, which are evenly distributed along the length direction X. This design with multiple folds and equal spacing can, on the one hand, make the strength distribution of the tab 10 in the length direction X more uniform, further enhancing the overall structural stability; on the other hand, the regular arrangement can be precisely matched with the forming structure of the pressing mold, making it easy to press and form in one go by pressing, thereby effectively improving the production efficiency of the reinforcing zone 2 and simplifying the processing technology.

[0040] Furthermore, in the above embodiments, there are multiple arc-shaped folds 3, and the angle between the tangent direction at any point on the arc-shaped fold 3 and the plane where the main body area 1 is located is 10°-30°. Figure 5 For example, the angle m between the tangent direction at point O and the plane containing the main body area 1 is 10°-30°. By controlling the angle within the above range, it is ensured that the arc-shaped folds 3 can effectively enhance the structural strength of the tab 10, while avoiding molding defects that may be caused by excessive angles. This ensures the stability of the tab 10 shape while maintaining strength, and further adapts to the requirements of the production process.

[0041] Furthermore, in the above embodiments, the wavy curve is a sine curve. Studies have found that the sine curve, with its uniform and continuous periodic undulation characteristics, can more reasonably disperse stress and avoid local stress concentration. Therefore, compared with other curve shapes, it can provide the tab 10 with better structural strength and further enhance its resistance to deformation in the length direction X.

[0042] Furthermore, such as Figure 6 As shown in the embodiments above, the horizontal projection length d1 of the sine curve within one period is 4-6 mm. This optimized design within this size range can further improve the structural stability of the reinforcing region 2 while ensuring the stress dispersion effect brought about by the periodic fluctuations of the sine curve, thereby ensuring that the tab 10 obtains more reliable strength support.

[0043] Furthermore, in the above-mentioned implementation methods, such as Figure 3As shown, within one cycle of the sine curve, the horizontal distance d2 between adjacent peaks and troughs is 2mm-3mm. This optimized distance parameter ensures that the undulation of the wave-like structure is within a moderate range, thus avoiding both localized stress caused by excessively small spacing and insufficient structural support caused by excessively large spacing. This moderate undulation interval can more evenly distribute external forces, working synergistically with the arc-shaped folds 3 to effectively ensure and further enhance the overall structural strength of the tab 10.

[0044] Furthermore, such as Figure 6 As shown in the above embodiments, the amplitude A of the sine curve is 2mm-4mm. This optimized amplitude range ensures that the wave-shaped structure provides sufficient anti-deformation support for the tab 10, and also effectively enhances the structural strength of the tab 10 in the length direction X through a moderate undulation design, thereby making the overall force on the tab 10 more balanced.

[0045] This utility model also provides a lithium battery electrode, which includes an electrode body and a tab 10 as described in any of the above embodiments, wherein the tab 10 is located on one side of the electrode body. It should be noted that... Figures 1-6 Only a portion of the electrode body 4 is shown in the image.

[0046] By adopting the above technical solution, the lithium battery electrode sheet provided by this utility model, due to the use of the tab 10 with the above-mentioned reinforcing region 2, can effectively enhance the deformation resistance of the tab 10, thereby reducing problems such as collapse and wrinkles, reducing manual re-injection costs, and improving production efficiency; at the same time, it can also ensure the quality and consistency of ultrasonic welding, optimize the battery electrical performance and safety, and the process is simple and suitable for large-scale production.

[0047] Furthermore, in the above embodiments, the reinforcing region 2 is located on the side away from the electrode body, relative to the main body region 1. That is, by placing the reinforcing structure in the free end region of the tab 10 away from the electrode body, this arrangement can specifically strengthen the parts of the tab 10 most prone to collapse and deformation, making the structural reinforcement more targeted. At the same time, this design avoids interfering with the structure of the connection between the tab 10 and the electrode body, ensuring the connection stability between the tab 10 and the electrode, thereby improving the tab's resistance to deformation while ensuring the overall structural stability of the electrode.

[0048] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A type of electrode, characterized in that, include: The main area is planar; The reinforcing region is wavy along the length of the tab, and the surface of the reinforcing region has arc-shaped folds that bulge outward relative to the surface of the reinforcing region and extend along the width of the tab.

2. The electrode tab according to claim 1, characterized in that, The arc-shaped folds are axially symmetrical about the centerline of the tab in the width direction.

3. The electrode tab according to claim 1, characterized in that, There are multiple arc-shaped folds, and the multiple arc-shaped folds are distributed at equal intervals along the length direction.

4. The electrode tab according to claim 1, characterized in that, There are multiple arc-shaped folds, and the angle between the tangent direction at any point on the arc-shaped fold and the plane where the main body area is located is 10°-30°.

5. The electrode tab according to claim 1, characterized in that, The wavy curve is a sine curve.

6. The electrode tab according to claim 5, characterized in that, The horizontal projection length of the sine curve within one period is 4-6 mm.

7. The electrode tab according to claim 5, characterized in that, The horizontal distance between adjacent peaks and troughs of the sine curve within one cycle is 2-3 mm.

8. The electrode tab according to claim 5, characterized in that, The amplitude of the sine curve is 2-4 mm.

9. A lithium battery electrode, characterized in that, It includes an electrode body and an electrode tab as described in any one of claims 1-8, wherein the electrode tab is located on one side of the electrode body.

10. The electrode sheet according to claim 9, characterized in that, The reinforcement region is located on the side away from the electrode body, relative to the main body region.

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