Novel pole piece structure

Abstract

The utility model provides a novel pole piece structure, which relates to the technical field of pole piece structures, and comprises an electrode piece, the surface of the electrode piece is fixedly provided with a pole lug, the pole lug is of a multi-layer pole lug structure, the height of the first layer of pole lug is increased by L / 2, and the height of each subsequent layer of pole lug is increased by L / 2-L / n. According to the utility model, by optimizing the multi-layer tab structure on the surface of the electrode and carrying out layered progressive height design, the height of the tab on each layer is gradually reduced, so that the problem that the heights of all layers are inconsistent after the tabs are flattened under the action of a pressing block in the traditional structure is effectively avoided; the tabs with different heights avoid adverse effects caused by welding distance difference in the ultrasonic welding process, ensure that the distance between each layer of tab and a welding point is consistent, and avoid insufficient overcurrent caused by height difference. In addition, due to the differentiated design of the heights of the tabs, the possibility of structural interference is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrode structure technology, and in particular to a novel electrode structure. Background Technology

[0002] The field of electrode structure technology primarily involves the design and optimization of electrodes in electrochemical devices, particularly in energy storage equipment such as lithium-ion batteries and supercapacitors. The electrode structure is one of the core components of a battery; through rational material selection and geometric design, it enhances the electrochemical performance, conductivity, mechanical strength, and stability of the electrode. Electrode design directly impacts the battery's energy density, power density, cycle life, and safety performance, making it a key area driving battery technology advancement. Technological research and development typically includes multiple aspects such as electrode material development, coating process improvement, and structural optimization, with the aim of enhancing the overall performance of energy storage devices.

[0003] However, existing technologies typically employ a highly uniform tab design, resulting in variations in the distance from each tab layer to the welding plane after flattening. This variation can lead to inconsistent connections between the tabs and the welding points, with some tabs extending beyond the welding area, resulting in decreased conductivity and insufficient overcurrent capacity, thus affecting the battery's electrochemical performance. Furthermore, excessive tab extension can interfere with other structural components, causing mechanical damage and further reducing the battery's structural stability and safety. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this utility model is to solve the technical problems mentioned in the background section.

[0005] The present invention adopts the following technical solution: a novel electrode structure, including an electrode sheet, wherein an electrode tab is fixedly installed on the surface of the electrode sheet, the electrode tab is a multi-layer electrode tab structure, wherein the height of the first layer of electrode tab is increased by L / 2, and the height of each subsequent layer of electrode tab is increased by L / 2-L / n.

[0006] Preferably, n is the number of tab layers, and L is the distance difference between the end of the tab and the welding point.

[0007] Preferably, the surface of the electrode tab has creases.

[0008] Preferably, the crease is located on the surface of the tab near the bottom.

[0009] Preferably, the tabs are rectangular structures, and the width of each layer of tabs is the same.

[0010] Preferably, the tab is made of a conductive metal material, such as aluminum or copper.

[0011] Preferably, the tab is connected to the electrode sheet by ultrasonic welding.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this invention, by optimizing the multi-layer tab structure on the electrode surface and implementing a layered, progressively increasing height design, the height of each tab layer gradually decreases. This design effectively avoids the problem of inconsistent heights between layers after the tabs are flattened under the action of a clamping block in traditional structures. The different heights of the tabs prevent adverse effects caused by differences in welding distance during ultrasonic welding, ensuring consistent distance between each tab layer and the welding point, and avoiding insufficient current flow due to height differences. Furthermore, the differentiated tab height design reduces the possibility of structural interference, improving the overall conductivity and structural stability of the electrode. This enhances the current transmission efficiency and reliability of the battery, helps extend battery life and increase power density, and improves safety performance through more stable welding results.

[0014] 2. In this utility model, during actual use, creases are provided on the surface of the tab. These creases facilitate pressing and bending of the tab, and also fix the bending position of the tab, preventing offset and skewing. By providing creases on the tab surface, this utility model effectively improves the controllability and consistency of the tab during the pressing process. The crease design ensures that the tab bends along a predetermined path and position, avoiding skewing caused by bending offset, thus guaranteeing the accuracy of the electrode structure. The fixed bending position not only improves the stability of the operation process but also reduces the adverse effects of tab position deviation, such as poor welding contact or unstable current conduction. The application of creases makes the pressing process smoother, reducing mechanical stress on the tab material, thereby improving the durability of the tab and the overall reliability of the battery. Furthermore, the creases can, to some extent, avoid structural interference problems caused by uneven bending of the tab, further optimizing the battery's conductivity and mechanical strength. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a novel electrode structure proposed in this utility model;

[0016] Figure 2 A side view of a novel electrode structure is provided for this utility model;

[0017] Figure 3 This invention proposes a novel electrode structure. Figure 2 Enlarged view of point A in the middle.

[0018] Legend:

[0019] 1. Electrode sheet; 2. Tab; 3. Crease. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1

[0023] Please see Figure 1-3 This utility model provides a technical solution: a novel electrode structure, including an electrode sheet 1, with tabs 2 fixedly mounted on the surface of the electrode sheet 1. The tabs 2 have a rectangular structure, and each layer of tabs 2 has the same width. The tabs 2 are connected to the electrode sheet 1 by ultrasonic welding. The ultrasonic welding method generates high-frequency vibrations between the electrode sheet 1 and the tabs 2, causing the material surfaces to melt rapidly and bond together. This connection method has high welding strength and conductivity, effectively avoiding the contact problems existing in traditional welding methods. To adapt to different application scenarios, the tabs 2 can also be welded using laser welding or resistance welding. Laser welding allows for precise control and is suitable for applications requiring high-precision connections, while resistance welding is suitable for mass production and has a lower cost.

[0024] Please see Figure 1-3The second tab is made of a conductive metal material, either aluminum or copper. Aluminum is lightweight, low-cost, and highly corrosion-resistant, making it suitable for battery applications requiring both light weight and good oxidation resistance. Copper, on the other hand, offers higher conductivity and mechanical strength, making it suitable for high-power-density battery designs. By choosing different materials, different design requirements can be flexibly addressed; for example, copper tabs can be used in high-power output batteries, while aluminum can be used in products with higher weight-loss requirements. The tab 2 is a multi-layered tab structure. The height of the first layer of tab 2 increases by L / 2, and the height of each subsequent layer of tab 2 increases by L / 2 - L / n, where n is the number of tab 2 layers, and L is the distance of the largest tab layer beyond the welding point in a traditional tab structure, which is the maximum distance difference between the end of the tab and the welding point in a traditional design. This multi-layered structure of tab 2, through optimized height design, makes the increase in height of each layer of tab 2 gradually decrease. This height design not only ensures the overall conductivity of tab 2, but also avoids the problem of height differences caused by the flattening effect of the pressure block after welding due to inconsistent tab heights in traditional designs. In addition, the layered height design also reduces welding defects caused by different welding distances during ultrasonic welding of different layers of tab 2, ensuring that the distance between each layer of tab 2 and the welding point is consistent, effectively improving the reliability of welding.

[0025] Example 2

[0026] Please see Figure 2-3 The tab 2 has a crease 3 on its surface, located near the bottom. The crease 3 can be formed by molding or machining. This design helps ensure the tab 2 maintains consistency and controllability during bending, preventing skewing due to improper bending. The presence of the crease 3 makes the bending position of the tab 2 more stable in practical applications, allowing for a pre-set bending path and ensuring accuracy during the bending process. The bending process of the tab 2 can be achieved through mechanical pressing or manual operation. Guided by the crease 3, the bent tab 2 can be precisely positioned, preventing tilting or positional deviation during the installation and use of the electrode sheet 1.

[0027] Working principle: By optimizing the multi-layered tab 2 structure on the surface of electrode sheet 1, the height is designed in a layered and progressive manner, so that the height of each layer of tab 2 gradually decreases as it increases. This design effectively avoids the problem of inconsistent heights between layers after the tab 2 is flattened under the action of the pressure block in traditional structures. The different heights of tab 2 avoid the adverse effects caused by differences in welding distance during ultrasonic welding, ensuring that the distance between each layer of tab 2 and the welding point is consistent, and avoiding insufficient current due to height differences. In addition, the differentiated design of tab 2 height reduces the possibility of structural interference and improves the overall conductivity and structural stability of electrode sheet 1. This invention enhances the current transmission efficiency and reliability of the battery, helping to extend its lifespan and increase power density. Simultaneously, it improves safety performance through more stable welding. The crease 3 on the surface of the tab 2 facilitates pressing and bending, and also fixes the bending position of the tab 2, preventing misalignment and skewness. By providing crease 3 on the surface of the tab 2, this invention effectively improves the controllability and consistency of the tab 2 during the pressing process. The crease 3 design ensures that the tab 2 bends along a predetermined path and position, avoiding skewness caused by bending deviation, thus guaranteeing the accuracy of the electrode structure. The fixed bending position not only improves the stability of the operation process but also reduces the adverse effects of tab 2 positional deviation, such as poor welding contact or unstable current conduction. The application of crease 3 makes the pressing process smoother, reducing mechanical stress on the tab 2 material, thereby improving the durability of the tab 2 and the overall reliability of the battery. In addition, the crease 3 can, to some extent, avoid structural interference caused by uneven bending of the tab 2, further optimizing the battery's conductivity and mechanical strength.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A novel electrode structure, comprising an electrode sheet (1), characterized in that: The electrode sheet (1) is fixedly mounted with tabs (2). The tabs (2) are multi-layer tab structures, wherein the height of the first layer of tabs (2) increases by L / 2, and the height of each subsequent layer of tabs (2) increases by L / 2 - L / n. The tabs (2) are made of conductive metal material, which is aluminum or copper. The surface of the tabs (2) is provided with creases (3).

2. The novel electrode structure according to claim 1, characterized in that: n is the number of layers of tab (2), and L is the distance difference between the end of tab (2) and the welding point.

3. The novel electrode structure according to claim 1, characterized in that: The crease (3) is located on the surface of the tab (2) near the bottom.

4. The novel electrode structure according to claim 1, characterized in that: The tabs (2) are rectangular structures, and the width of each tab (2) is the same.

5. The novel electrode structure according to claim 1, characterized in that: The tab (2) is connected to the electrode sheet (1) by ultrasonic welding.

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