Jelly-Roll Electrode Assembly for Battery Casing Contact
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Solution Overview
Problem
The existing manufacturing methods for secondary batteries hinder the maximization of contact area between the electrode current collector and the inner wall of the battery casing, limiting resistance reduction and heat dissipation performance.
Innovation Solution
A method involving the manufacturing of a jelly-roll electrode assembly by winding electrodes and separators, attaching a tape to cover the outermost edge, and removing the tape while the assembly is in the battery casing to ensure the electrode current collector contacts the inner wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a sealing tape is attached to the outer peripheral surface of the jelly-roll electrode assembly to prevent unwinding, then the electrode assembly is secured, but the contact area between the electrode current collector and the battery casing is reduced
Solution Approach 1:
The sealing tape is attached to the electrode assembly in advance during manufacturing to prevent unwinding, but is designed to be removable. The tape is removed after electrode assembly insertion into the battery casing, allowing the current collector to achieve maximum contact with the casing inner wall for optimal electrical conductivity and heat dissipation.
Solution Approach 2:
The sealing function is separated from the structural integrity function. The sealing tape provides temporary structural support during assembly, but is removed to allow direct contact between the current collector and battery casing, achieving both security during manufacturing and optimal electrical contact in the final product.
2Stability of the object's composition
If a sealing tape is attached to the outer peripheral surface of the electrode assembly, then the electrode assembly is secured, but the heat dissipation performance is hindered
Solution Approach 1:
The sealing tape is attached temporarily during manufacturing to secure the electrode assembly, but is removed after battery casing insertion. This allows the current collector to achieve direct thermal contact with the battery casing inner wall, enabling effective heat dissipation while maintaining assembly stability during production.
Solution Approach 2:
The sealing tape is extracted from the final battery structure after serving its protective function during assembly. This removal eliminates the thermal barrier, allowing direct heat transfer from the current collector to the battery casing for improved heat dissipation performance.
Data Source
AI summary
A method of manufacturing a secondary battery includes manufacturing an electrode assembly by winding a first electrode, a second electrode, and a separator together; attaching a tape to cover an outermost edge portion of the electrode assembly; accommodating the electrode assembly in a battery casing having an open end; and removing the tape attached to the electrode assembly from the electrode assembly. The tape includes a first portion attached to the electrode assembly, and a second portion extending from the first portion in a first direction towards the open end of the battery casing. In the removing the tape, the tape is removed by pulling the second portion.