A structure for improving the misalignment of the core tab in a new lithium battery

Abstract

The utility model discloses a kind of structures for improving novel lithium battery core ear misplacement, including core, pole piece and the led ear. The ear is divided into inner ring ear and outer ring ear, inner ring ear is set on the core inner layer pole piece, outer ring ear is set on the core outer layer pole piece. The size of inner ring ear is greater than the size of outer ring ear, and the design of size decrease provides displacement space for pole piece thickness rebound, to reduce the influence of ear misplacement on battery performance. By adjusting die cutting size, each layer ear presents uniform alignment arrangement form after winding. The utility model is simple in structure, and production process cost is low, can effectively solve the problem that lithium battery core ear misplacement is caused by pole piece thickness rebound, significantly improve the performance and safety of battery, applicable to the design and manufacturing field of various lithium batteries.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery manufacturing technology, and in particular to a structure for improving the misalignment of the core tabs in a novel lithium battery. Background Technology

[0002] Lithium-ion batteries are currently the core energy storage devices in electronic devices and energy storage units, and their performance and safety directly affect the user experience and lifespan of these devices. In the manufacturing process of lithium batteries, the wound structure is a crucial component. Electrodes are wound into multiple layers, with tabs leading out as current conduction channels. However, in existing technologies, the tabs are typically designed to be of the same size and aligned during winding. While this design achieves good welding results initially, as the electrode thickness rebounds during battery use or storage, the outer tabs often shift inwards, leading to tab misalignment.

[0003] Misaligned tabs not only significantly increase welding difficulty and reduce battery production efficiency, but can also lead to uneven current distribution within the battery, increasing local resistance and affecting discharge performance. Simultaneously, misalignment disrupts the battery's heat dissipation balance, potentially causing localized overheating and even safety hazards. Furthermore, misalignment can cause poor internal circuit connections within the cell, accelerating capacity decay and thus shortening battery life. Existing improvement methods mainly focus on increasing the precision of winding and die-cutting processes, but these methods are costly and cannot effectively address the misalignment problem caused by electrode thickness rebound.

[0004] Therefore, existing technologies urgently need a more optimized design to effectively mitigate the impact of electrode misalignment on lithium battery performance and safety, and reduce production costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a structure that improves the misalignment of the core tabs in a new type of lithium battery. By optimizing the size design of the tabs, the size of the inner tab is made larger than that of the outer tab, so as to provide displacement space for the thickness rebound of the electrode sheet, reduce the misalignment of the tabs caused by thickness changes, thereby improving battery performance and safety, while reducing manufacturing costs and simplifying the process.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an improved structure for misaligned electrode tabs in a novel lithium battery, comprising a core and electrode sheets disposed within the core, wherein the electrode sheets lead out several electrode tabs; the size of the electrode tabs gradually decreases from the inside to the outside to adapt to the size changes caused by thickness rebound of different layers of electrode sheets in the core, thereby reducing the impact of electrode tab misalignment.

[0007] Furthermore, the electrode tab includes an inner ring electrode tab and an outer ring electrode tab. The inner ring electrode tab refers to the electrode tab disposed on the inner layer electrode sheet of the core, and its size is larger than that of the outer ring electrode tab disposed on the outer layer electrode sheet of the core. The size refers to the width of the electrode tab, or includes both width and height.

[0008] Furthermore, the size difference between the inner and outer ring tabs is achieved through the variation in the width of the tabs, wherein the difference between the width of the inner ring tab and the width of the outer ring tab is used to reserve displacement space when the electrode thickness rebounds.

[0009] Furthermore, after winding, the inner and outer electrode tabs are adjusted in size so that the outer ends of all the electrode tabs are eventually arranged in a uniform and aligned manner.

[0010] The beneficial effects of this utility model are:

[0011] This invention optimizes the arrangement of the core tabs by designing the size of the tabs to gradually decrease from the inside out, effectively reducing the problem of tab misalignment caused by the rebound of the electrode thickness, and significantly improving the performance and service life of the battery.

[0012] This invention divides the electrode tab into an inner ring electrode tab and an outer ring electrode tab. By defining the size difference between the inner ring electrode tab and the outer ring electrode tab, it provides a reasonable displacement space for the electrode thickness rebound, thereby reducing the risk of poor welding and uneven current distribution caused by thickness changes.

[0013] This invention adjusts the width difference between the inner and outer ring tabs, making the inner ring tab wider than the outer ring tab. This provides higher fault tolerance for the core design while maintaining conductivity, thus enhancing the adaptability and stability of the structure.

[0014] This invention improves the consistency of electrode welding, simplifies the production process, and reduces the operational difficulty during production by adjusting the die-cutting size after winding, so that the outer ends of all electrode tabs are ultimately arranged in a uniform and aligned manner.

[0015] This utility model has a simple design and low manufacturing cost. By optimizing the structure of the electrode tab, it does not require additional complex production equipment or adjustments to the existing process flow, thereby reducing production costs and improving production efficiency.

[0016] This invention reduces electrode misalignment and avoids localized overheating caused by uneven electrode arrangement during battery operation, thereby improving the battery's thermal stability and safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the electrode ears for this utility model test paper;

[0018] Figure 2 This is a schematic diagram of the electrode tab after the electrode sheet rebounds according to this utility model;

[0019] In the diagram, 1-core; 2-electrode; 3-electrode tab; 31-outer ring electrode tab; 32-inner ring electrode tab. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0021] like Figure 1 As shown, Figure 1 This is a schematic diagram of the electrode tabs in the test paper of this utility model. The utility model includes a core 1, electrode sheets 2, and electrode tabs 3. During the winding process, the electrode sheets 2 form multiple layers and extend out to form several electrode tabs 3. The electrode tabs 3 are divided into outer ring electrode tabs 31 and inner ring electrode tabs 32 according to their position during the winding process. The inner ring electrode tabs 32 are located near the inner layer of the electrode sheets 2 of the core 1, and the outer ring electrode tabs 31 are located near the outer layer of the electrode sheets 2 of the core 1.

[0022] During the test roll process, the tabs 3 of each layer are arranged according to the design scheme, with their dimensions gradually decreasing from the inside out; that is, the size of the inner ring tab 32 is larger than the size of the outer ring tab 31. This design ensures that the outer edges of the tabs 3 remain aligned during the test roll stage, forming a neat arrangement, thus providing a good foundation for subsequent welding processes. At the same time, the size difference between the inner ring tab 32 and the outer ring tab 31 provides reasonable displacement space for potential misalignment of the tabs 3 caused by the thickness rebound of the electrode sheet 2, ensuring that the performance of the tabs 3 is not affected by misalignment during subsequent use.

[0023] like Figure 2 As shown, Figure 2 This is a schematic diagram of the electrode tab after the electrode sheet rebounds. When the electrode sheet 2 experiences thickness rebound due to storage or battery operation, the thickness of the electrode sheet 2 may increase, causing the outer ring electrode tab 31 to shift inward. However, since the inner ring electrode tab 32 is larger than the outer ring electrode tab 31, and the size difference between the two is designed to reserve space for rebound displacement, the shift of the electrode tab 3 can be effectively absorbed, thereby reducing the impact of electrode tab 3 misalignment on battery performance.

[0024] Furthermore, even after thickness rebound occurs, all tabs 3 can still maintain their outer end alignment by adjusting the die-cutting dimensions, ensuring the stability of the welding process. This design not only avoids uneven current distribution and poor welding caused by tab 3 misalignment, but also improves the overall performance and reliability of the battery.

[0025] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A structure for improving misalignment of the core tabs in a novel lithium battery, comprising a core (1) and an electrode sheet (2) disposed within the core (1), characterized in that: The electrode plate (2) leads out several tabs (3); the size of the tabs gradually decreases from the inside to the outside.

2. The structure for improving the misalignment of the core tabs in a novel lithium battery according to claim 1, characterized in that: The electrode tab (3) includes an inner electrode tab (32) and an outer electrode tab (31). The inner electrode tab (32) refers to the electrode tab (3) set on the inner layer electrode sheet of the core, and its size is larger than that of the outer electrode tab (31) set on the outer layer electrode sheet (2) of the core (1).

3. The structure for improving misalignment of the core tabs in a novel lithium battery according to claim 2, characterized in that: The size difference between the inner ring electrode (32) and the outer ring electrode (31) is achieved by the change in the width of the electrode (3), wherein the difference between the width of the inner ring electrode (32) and the width of the outer ring electrode (31) is used to reserve displacement space when the electrode thickness rebounds.

4. The structure for improving the misalignment of the core tabs in a novel lithium battery according to claim 3, characterized in that: After winding, the inner and outer electrode tabs (32) and the outer electrode tabs (31) are adjusted in size so that the outer ends of all the electrode tabs (3) are eventually arranged in a uniform and aligned manner.

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