Radii-Modulated Electrode Core for Low Inductive Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Energy-storage device electrode cores face challenges with high inductive impedance, thermal performance, and core involute issues, leading to degraded performance and potential balancer damage, especially in high-temperature environments and applications like electric automobiles.
Innovation Solution
The design features a low-inductive impedance electrode core with reduced turns and radii-modulated structure that includes heat-removal vias, eliminating the 'jelly-roll' type core and core involute, allowing for efficient heat dissipation and reduced inductive impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional jelly-roll type core with multiple turns is used, then the electrode surface area is increased, but the inductive impedance increases
Solution Approach 1:
The electrode core is divided into multiple discrete turns (e.g., 3-5 turns) rather than a continuous jelly-roll structure. Each turn is separated by insulating spacers, which breaks the continuous current path and reduces inductive coupling between adjacent electrode layers, thereby lowering overall inductive impedance while maintaining sufficient surface area for energy storage.
Solution Approach 2:
Insulating spacers are introduced as intermediary elements between adjacent electrode turns. These spacers physically separate the turns and electrically isolate them, preventing direct current leakage and reducing parasitic inductance. The spacers act as mediators that maintain the structural integrity of the multi-turn configuration while minimizing harmful electromagnetic effects.
2Shape
If a core involute is used in modern cell construction, then the electrode core structure is formed, but sharp bend radii create hot spots and leakage current
Solution Approach 1:
Instead of creating sharp inward bends (core involute) at the center of the electrode core, the design inverts the approach by using outward-facing gentle curves and larger bend radii. The electrode layers are configured to curve away from the center rather than wrap tightly around it, eliminating the sharp stress concentration points that generate hot spots and leakage current.
Solution Approach 2:
The bend radius parameter is significantly increased throughout the electrode core structure. Rather than allowing tight curls with small radii of curvature, the design specifies minimum bend radius constraints that ensure all electrode transitions are gentle and uniform. This parameter change distributes mechanical stress and heat generation more evenly, preventing localized hot spots.
3Temperature
If thermal control is improved in the electrode core, then thermal performance increases, but the device complexity increases
Solution Approach 1:
The insulating spacers that are already present for electrical isolation serve a dual function: they provide electrical insulation between turns and simultaneously act as thermal management elements. The spacers create controlled air gaps that facilitate heat dissipation through convection and radiation, while also maintaining the reduced-inductance multi-turn structure. This multi-functionality improves thermal performance without adding separate thermal control components.
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
This design enhances thermal and electromagnetic performance, reduces equivalent series resistance, and increases the longevity and efficiency of energy-storage devices by improving heat removal and reducing inductive impedance.
Implementation Method 1
The internal electrode core heat-removal vias are defined by the modulation patterns that in turn define the size and layout of the folds in the electrode
Implementation Method 2
facilitate efficient heat removal away from the electrode
Implementation Method 3
internal inductance, generated by the circumferential current flow about the 'jelly-roll' inside the cell core
Data Source
AI summary
An energy-storage device electrode core is disclosed that features relatively low-inductive impedance (and thus low equivalent series resistance (ESR)). Also disclosed is an energy-storage device electrode core that features a radii-modulated electrode core that forms extra vias to facilitate efficient heat removal away from the electrode, thus improving the performance and capabilities of an energy-storage device so equipped. The internal electrode core heat-removal vias are defined by the modulation patterns that in turn define the size and layout of the folds in the electrode, which are circumferentially collapsed about the center axis of the electrode core.