Bent Electrode Flag Assembly for Outward Battery Heat Dissipation
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Solution Overview
Problem
Secondary batteries generate excessive heat at the tab portion of the electrode assembly, leading to thermal instability and reduced lifespan, necessitating improved heat management to prevent inward heat movement.
Innovation Solution
The electrode assembly design includes first and second flag portions extending from the electrodes in opposite directions, bent away from the winding axis, with varying flag lengths, widths, and spacings to facilitate outward heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tab portion of the electrode assembly is used for current collection, then electrical connection is achieved, but heat is generated excessively at the tab portion
Solution Approach 1:
The patent extracts the current collection function from the tab portion by introducing a separate current collector that extends to the tab. This separation allows the tab to focus on electrical connection while the current collector handles current collection, reducing heat generation at the tab portion and improving thermal stability.
Solution Approach 2:
The patent introduces a current collector as an intermediary component between the electrode and the external circuit. This current collector acts as a mediator that distributes current more evenly, preventing excessive heat concentration at the tab portion while maintaining effective electrical connection.
2Use of energy by moving object
If heat is generated at the tab portion, then electrical current flows, but heat moves inward toward the winding axis causing thermal instability
Solution Approach 1:
The patent changes the spatial arrangement by extending the current collector beyond the tab portion in a direction away from the winding axis. This dimensional extension creates a heat dissipation pathway that directs heat outward rather than inward, preventing thermal instability while maintaining current flow.
Solution Approach 2:
The patent employs asymmetric design where the current collector extends unequally on both sides of the tab portion, with one side extending further away from the winding axis. This asymmetric configuration creates a preferred heat dissipation direction outward from the battery, preventing heat accumulation near the winding axis and improving thermal stability.
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
Enhances thermal stability and extends the battery cell's lifespan by directing heat outward, reducing internal heat accumulation and improving overall performance.
Implementation Method 1
the first flag portion is bent in a direction away from the winding axis... induce the heat of the battery cell to move outward rather than inward
Data Source
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AI summary
The present disclosure relates to an electrode assembly comprising: a first electrode; a second electrode having an electrical polarity different from that of the first electrode; and a separator interposed between the first electrode and the second electrode, wherein the first electrode and the second electrode have a flag which is bent outward, and relates to a battery cell including the same.