Cylindrical Pouch Battery Mechanical Structure for Swelling Constraint
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Solution Overview
Problem
Lithium-polymer batteries in portable electronic devices experience capacity reduction and swelling due to internal impedance and degradation, leading to structural integrity issues and potential device damage, as conventional battery-monitoring mechanisms do not manage swelling effectively.
Innovation Solution
A battery cell design featuring a jelly roll with a mechanical structure, such as a cylindrical tube or sheet, wrapped around the perimeter to maintain structural integrity, which includes conductive tabs for terminals and additional components like end caps or washers to prevent damage, ensuring the jelly roll is enclosed in a flexible pouch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flexible pouch is used to enclose the jelly roll, then the battery achieves high packaging efficiency and is lightweight, but the structural integrity deteriorates due to swelling and internal stresses
Solution Approach 1:
The patent combines a flexible pouch with a mechanical structure (such as a rigid container or reinforcing framework) to create a composite enclosure system. This allows the battery to maintain the lightweight and flexible advantages of the pouch while gaining the structural support needed to resist swelling and maintain integrity during aging and degradation.
2Power
If the battery operates for extended periods at high charge voltage and temperature, then power output is maintained, but capacity degradation accelerates due to oxidation and electrode degradation
Solution Approach 1:
The patent incorporates a mechanical structure that provides preemptive support to the jelly roll before degradation occurs. This structure acts as a cushioning framework that prevents the electrode layers from collapsing or deforming under thermal and electrical stress, thereby slowing down oxidation and maintaining capacity retention even during extended high-power operation.
3Device complexity
If conventional battery-monitoring mechanisms are used, then simple monitoring is achieved, but swelling management capability is insufficient leading to undetected degradation
Solution Approach 1:
The patent incorporates a visual indicator mechanism that changes color or provides visual feedback when the battery experiences swelling or degradation. This allows users to easily detect battery health issues without complex electronic monitoring systems, combining simplicity with effective swelling management through intuitive visual cues.
Data Source
AI summary
The disclosed embodiments relate to the design and manufacture of a battery cell. The battery cell includes a jelly roll containing layers which are wound together, including a cathode with an active coating, a separator, and an anode with an active coating. The battery cell also includes a mechanical structure disposed around a perimeter of the jelly roll to maintain a structural integrity of the jelly roll. Finally, the battery cell includes a pouch enclosing the mechanical structure and the jelly roll, wherein the pouch is flexible.