Cylindrical Electrode Assembly Structure for Lower Tab Resistance
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Solution Overview
Problem
Conventional jelly roll electrode assemblies in cylindrical batteries face high resistance due to the narrow width of the positive and negative electrode tabs, limiting electron movement and affecting battery output.
Innovation Solution
The electrode assembly features a novel structure with disk-shaped and cylindrical parts for the positive and negative electrode current collectors, eliminating the need for winding and reducing resistance by allowing electron movement through disk-shaped terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional jelly roll electrode assembly with narrow electrode tabs is used, then the battery can be manufactured with a compact structure, but the resistance increases and electron movement is limited
Solution Approach 1:
The patent transitions from traditional narrow tab electrodes to a three-dimensional porous electrode structure. The porous structure provides multiple electron transport pathways in three dimensions, replacing the limited two-dimensional surface of narrow tabs. This dimensional expansion significantly reduces resistance while maintaining compact battery form factor, as electrons can move through the porous network rather than being constrained to thin tab surfaces.
Solution Approach 2:
The patent employs porous electrode structures with controlled pore sizes and distributions. The porous material provides extensive internal surface area for electrochemical reactions while maintaining electrical connectivity through the porous network. This structure reduces resistance by providing multiple parallel electron transport paths, directly addressing the limitation of narrow tabs while preserving the compact battery design.
2Quantity of substance
If a jelly roll electrode assembly structure is used, then the battery achieves relatively large capacity, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent divides the electrode into multiple porous segments or units that can be independently manufactured and then assembled. This segmentation allows for simplified manufacturing of individual components while achieving large overall capacity through the combination of multiple segments. The modular approach reduces the complexity of manufacturing large-capacity electrodes as single pieces, enabling more efficient production processes.
3Power
If narrow electrode tabs are used in the jelly roll assembly, then the battery structure remains compact, but the output is limited due to high resistance
Solution Approach 1:
The patent uses porous electrode materials with optimized pore structures that provide extensive internal surface area for electrochemical reactions. The porous network maintains electrical connectivity while allowing rapid electron transport, significantly reducing resistance. This enables high power output as the porous structure supports high current densities without the resistance limitations of narrow tabs, while the overall battery remains compact.
Solution Approach 2:
The transition to three-dimensional porous electrode structures creates multiple electron transport pathways in addition to the traditional tab surface. This dimensional expansion provides parallel conduction paths that reduce resistance and enable higher current flow, directly improving battery output power while maintaining compact dimensions through efficient space utilization of the porous structure.
Data Source
AI summary
An electrode assembly includes a positive electrode member including a positive electrode current collector and a positive electrode active material coating layer formed on the positive electrode current collector; and a negative electrode member including a negative electrode current collector and a negative active material coating layer formed on the negative electrode current collector, wherein the positive electrode current collector comprises a disk-shaped positive electrode disk part, and a cylindrical-shaped positive electrode cylinder part extended from one surface of the positive electrode disk part, wherein the negative electrode current collector comprises a disk-shaped negative electrode disk part, and a cylindrical-shaped negative electrode cylinder part extended from one surface of the negative electrode disk part, and wherein the positive electrode member and the negative electrode member are assembled so that the positive electrode cylinder part and the negative electrode cylinder part are adjacent to each other.