Jelly-Roll Electrode Assembly Buffer Structure for Swelling Stability
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Solution Overview
Problem
Lithium batteries face challenges in achieving high capacity, reduced size, and improved structural stability due to volume changes in electrode assemblies, leading to potential structural integrity issues in compact devices.
Innovation Solution
Incorporating a buffer layer at the outermost region of the electrode assembly, which includes bent portions and an embossed structure, to absorb and mitigate volume changes during charging and discharging, thereby enhancing structural stability and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery size is reduced to achieve high loading capacity, then the energy density improves, but the structural stability deteriorates due to volume changes of electrode assemblies
Solution Approach 1:
A buffer layer is provided at the outermost region of the electrode assembly to absorb and mitigate volume changes that occur during charging and discharging cycles. This beforehand cushioning prevents structural damage before it can occur, allowing the battery to achieve high loading capacity in a compact size while maintaining structural stability through the protective buffer layer
2Volume of moving object
If the electrode assembly volume is reduced for compact devices, then the device size decreases, but the structural integrity worsens due to repeated volume changes during operation
Solution Approach 1:
The buffer layer is positioned at the outermost region of the electrode assembly to provide beforehand cushioning against volume changes during charging and discharging. This protective structure absorbs mechanical stress before it can compromise the structural integrity of the compact electrode assembly, enabling small battery size without sacrificing strength
3Stability of the object's composition
If the buffer layer is added to improve structural stability, then the structural integrity improves, but the device complexity increases
Solution Approach 1:
The buffer layer is applied selectively at the outermost region of the electrode assembly where it is most needed to handle volume changes, rather than throughout the entire structure. This local quality approach improves structural integrity at the critical interface while minimizing the overall complexity increase of the electrode assembly
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The buffer layer effectively reduces stress and deformation, preventing cracks and improving the structural integrity and heat dissipation of the electrode assembly, leading to enhanced performance and longevity of lithium batteries in compact devices.
Implementation Method 1
a first buffer portion on an outermost region of the electrode assembly and extendible along at least one of a winding direction of the electrode assembly and an opposite direction thereof
Implementation Method 2
the buffer layer effectively reduces stress and deformation, preventing cracks and improving the structural integrity and heat dissipation of the electrode assembly
Data Source
AI summary
An electrode assembly includes a first electrode, a second electrode, and a separator between the first electrode and the second electrode, the first electrode, the separator, and the second electrode being wound in a jelly-roll shape, and a first electrode tab, wherein the first electrode includes a first coated portion coated with a first electrode active material on a first substrate, and a first uncoated portion on the first substrate, on one side of the first coated portion, and free of the first electrode active material, wherein the first electrode tab is on the first uncoated portion of the first electrode, and wherein the first electrode further includes a first buffer portion on an outermost region of the electrode assembly and extendible along at least one of a winding direction of the electrode assembly and an opposite direction thereof.