Rolled Electrode Capacitor Layout for Internal Heat Dissipation
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Solution Overview
Problem
Electrochemical capacitors with roll-type electrode assemblies experience performance degradation and shortened lifespan due to internal temperature rise during charge and discharge cycles, particularly when exposed to high temperatures.
Innovation Solution
The electrochemical capacitor design features multiple electrode assemblies with varying numbers of winds for the positive and negative electrodes and separators, along with optimized lead wire connections, to increase the surface area and enhance heat dissipation, thereby preventing overheating and maintaining performance stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is formed in a roll type to increase energy density, then the capacity is improved, but the internal temperature rises during charge and discharge cycles causing performance degradation
Solution Approach 1:
The patent divides the electrode assembly into multiple independent pouches instead of using a single roll-type assembly. Each pouch contains its own electrodes and electrolyte, allowing heat to be distributed and dissipated across multiple smaller units rather than accumulating in one large rolled structure. This segmentation maintains high energy density while improving thermal management.
Solution Approach 2:
The patent transitions from a two-dimensional rolled structure to a three-dimensional stacked pouch configuration. By stacking multiple pouches vertically, the design increases surface area for heat dissipation while maintaining compact form factor and high energy density. This dimensional change allows better thermal pathways without sacrificing capacity.
2Use of energy by moving object
If the electrode assembly is exposed to high temperature during charge and discharge cycles, then the energy storage function is maintained, but the life span is shortened due to performance degradation
Solution Approach 1:
By dividing the electrode assembly into multiple pouches, the patent reduces thermal stress on any single unit during charge and discharge cycles. Each pouch experiences lower peak temperatures, which slows degradation reactions and extends the overall lifespan while maintaining energy storage functionality.
Solution Approach 2:
The patent introduces thermal management structures including heat dissipation fins and thermal conductive materials between pouches. These intermediary elements act as heat sinks and thermal pathways, mediating the temperature between the active electrodes and the external environment, thereby protecting the electrodes from excessive heat during cycling.
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 effectively prevents degradation of components, enhances heat dissipation, and extends the lifespan of electrochemical capacitors by maintaining stable performance over a longer period.
Implementation Method 1
An electrochemical capacitor is one of main devices for storing energy
Implementation Method 2
an electrolytic solution impregnated with the electrode and the separator to supply ions and enable the conduction of ions
Data Source
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AI summary
An electrochemical capacitor comprises: a plurality of electrode assemblies, each including a positive electrode configured in a rolled sheet form and having both surfaces coated with an active material layer, a negative electrode configured in a rolled sheet form to face the positive electrode and having both surfaces coated with an active material layer, and a separator interposed and rolled between the positive electrode and the negative electrode; a positive electrode lead wire electrically connected to the positive electrode of each of the plurality of electrode assemblies; and a negative electrode lead wire electrically connected to the negative electrode of each of the plurality of electrode assemblies.