Wound Electrode Assembly Layout for Axial Battery Heat Dissipation
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Solution Overview
Problem
Existing lithium secondary batteries face issues with heat dissipation during charging and discharging, which can lead to performance and reliability degradation.
Innovation Solution
The electrode assembly features a first and second electrode with varying current collector heights in the radial direction, coated active materials, and uncoated regions to enhance heat dissipation and stability, housed in a corresponding shaped battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large amount of heat is generated during charging and discharging, then energy conversion efficiency is improved, but heat dissipation becomes insufficient leading to performance deterioration
Solution Approach 1:
The current collector transitions from a traditional planar structure to a three-dimensional wavy structure with undulations in the thickness direction. This dimensional change creates additional surface area and thermal pathways, enabling improved heat dissipation while maintaining electrical conductivity and structural integrity during battery operation
Solution Approach 2:
The wavy structure creates regions with different thermal and electrical properties throughout the current collector. The undulations produce localized areas with varying thickness that can be optimized for different functions: some regions enhance heat dissipation while others maintain electrical conductivity, allowing simultaneous optimization of both thermal and electrical performance
2Temperature
If the current collector height is increased to improve heat dissipation, then cooling efficiency is improved, but internal space is wasted reducing energy density
Solution Approach 1:
The current collector utilizes the thickness direction (z-axis) to create wavy undulations, effectively using the third dimension to increase heat dissipation surface area without expanding the planar footprint. This allows thermal management improvement while maintaining compact battery cell geometry and maximizing volumetric energy density
Solution Approach 2:
The wave structure parameters (amplitude, wavelength, frequency) are optimized to achieve the desired heat dissipation performance within constrained space. By adjusting these geometric parameters, the design balances thermal management requirements with space utilization to maintain high energy density
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
Improves cooling efficiency and stability by efficiently dissipating heat through a direct axial path, maximizing energy density and reducing internal space waste.
Implementation Method 1
The operating principle of lithium secondary batteries is the electrochemical oxidation-reduction reaction. In other words, electricity is generated by the movement of lithium ions and is charged in the opposite process.
Implementation Method 2
A height of at least one of the first current collector and the second current collector varies in a radial direction from a winding center... efficiently dissipating heat through a direct axial path
Data Source
AI summary
An electrode assembly according to the present disclosure includes a first electrode and a second electrode, wherein the first electrode and the second electrode are wound into a roll, wherein the first electrode comprises a first coated region in which a first active material is coated on a first current collector, and a first uncoated region adjacent to the first coated region, wherein the second electrode comprises a second coated region in which a second active material is coated on a second current collector, and a second uncoated region adjacent to the second coated region, and wherein a height of at least one of the first current collector.