Coin Cell Electrode Notch Layout for Higher Volumetric Energy Density
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Solution Overview
Problem
Conventional coin-type secondary batteries face challenges in optimizing energy density per unit volume due to space constraints, particularly when the upper and lower surfaces are used as external terminals, leading to compromised battery characteristics.
Innovation Solution
A coin-type secondary battery design featuring a circular plan view shape with a single partial notch in the electrode assembly, which reduces dead space and enhances energy density by strategically locating the positive and negative electrode tabs adjacent to each other in the notch region, improving stability and safety within the exterior body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the upper and lower surfaces of the coin-type secondary battery are made to function as external terminals, then the battery can be used in constrained spaces, but the energy density per unit volume is damaged
Solution Approach 1:
The patent introduces a third dimension (depth/thickness) to resolve the contradiction. By creating a recessed portion that extends into the battery body from the upper surface, the design accommodates the tab routing space requirement without increasing the battery's planar footprint. This dimensional change allows the battery to maintain its compact form factor for constrained spaces while the recessed portion efficiently utilizes the internal volume to house tabs and electrolyte, thereby preserving energy density per unit volume.
2Ease of operation
If a notch is added to the circular plan view shape to route tabs, then tab routing is enabled, but dead space increases reducing energy density
Solution Approach 1:
The patent applies the nesting principle by placing the recessed portion containing the tabs and electrolyte inside the main battery body. The recessed portion is nested within the circular plan view shape, allowing tab routing functionality to be integrated into the internal structure rather than adding external protrusions. This nesting approach enables tab routing while minimizing dead space, as the recessed portion efficiently utilizes the internal volume that would otherwise be empty space.
3Adaptability or versatility
If multiple notches are added to the electrode assembly, then tab routing flexibility increases, but the circular shape integrity is compromised affecting stability
Solution Approach 1:
The patent applies asymmetry by introducing a single recessed portion with an opening at one specific location on the upper surface, rather than multiple symmetric notches. This asymmetric design provides sufficient tab routing flexibility for the battery's operational requirements while maintaining the overall circular symmetry and integrity of the battery's plan view shape. The single recessed portion creates minimal disruption to the circular轮廓, preserving the battery's stability and aesthetic appearance.
Data Source
AI summary
A secondary battery that includes an electrode assembly having a plurality of electrode configuration layers, each electrode configuration layer including a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode; and an exterior body enclosing the electrode assembly. The electrode assembly has a substantially circular plan view shape with a single partial notch.