Multi-Tab Cylindrical Roll Core Layout for Low-Impedance Li-Ion Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional cylindrical lithium-ion battery roll cores with limited tabs (1-2) suffer from high impedance and uneven heat distribution, failing to meet the increased demands of vehicle-mounted batteries for higher energy density, power output, and reliability.
Innovation Solution
A multi-tab cylindrical battery roll core design featuring electrode sheets with multiple tabs and leads, where the tabs and leads are stacked and arranged to protect the tabs during assembly, reducing the likelihood of tab damage and improving manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple tabs are overlapped during winding to reduce impedance, then the battery output power increases, but the tabs are prone to breaking due to thin material and low strength
Solution Approach 1:
The patent implements nested overlapping of tabs where inner layer tabs are positioned within outer layer tabs during winding. This nesting arrangement increases the effective contact area and current pathways, reducing impedance while distributing mechanical stresses across multiple layers, thereby preventing tab breakage despite the thin material strength
Solution Approach 2:
The patent performs preliminary positioning and fixation of tabs before the winding process. Tabs are pre-aligned and secured in their overlapping positions, ensuring proper nesting configuration is established before mechanical stresses occur during assembly, preventing tab breakage while maintaining the low-impedance multi-tab structure
2Device complexity
If traditional 1-2 tabs are used in cylindrical battery, then the structure is simple, but the battery has high impedance and unreasonable heat distribution
Solution Approach 1:
The patent divides the single tab connection into multiple segmented tabs distributed around the cylindrical battery. Each tab provides an independent current pathway, collectively reducing overall impedance and distributing heat generation across multiple contact points, improving power output while maintaining manageable structural complexity
3Power
If multiple tabs are arranged to overlap, then current distribution improves, but the tabs are vulnerable to damage during assembly process
Solution Approach 1:
The patent implements preliminary positioning and protective arrangement of tabs before assembly. Tabs are pre-configured in their overlapping positions with protective fixtures or guides that maintain proper alignment and prevent mechanical damage during subsequent assembly operations, ensuring both good current distribution and ease of manufacture
Data Source
AI summary
The present application discloses a multi-tab cylindrical battery roll core, including an electrode sheet and a separating film stacked and wound with each other; a tabs and a lead are arranged at the electrode sheet, the tabs is integrally connected with the electrode sheet, and the lead is fixedly connected to the electrode sheet; the tabs and the lead of the same electrode sheet are stacked with each other and are located at a side of a central hole of the roll core; on the same electrode sheet, the lead is located at a side of the tabs stacked with one another, or on the same electrode sheet, the tabs stacked with one another are located between two leads, and the leads can protect the tabs.