Cylindrical Battery Electrode Assembly for Heat-Releasing Insertion
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Solution Overview
Problem
The terminal end of the electrode assembly being covered by tape prevents effective heat release from the negative electrode current collector in cylindrical batteries, as it reduces contact with the exterior housing, compromising safety and efficiency.
Innovation Solution
A cylindrical battery design with an exposed portion of the negative electrode current collector at the outermost circumference, combined with double-sided tapes on the inner surface for fixing the outermost circumferential portion, ensures easy insertion and effective heat dissipation by allowing close contact with the exterior housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal end of the electrode assembly is covered by tape to smoothly insert the electrode assembly into the exterior housing can, then the ease of operation is improved, but the heat release efficiency deteriorates because the exposed portion of the negative electrode current collector is less likely to contact the exterior housing can
Solution Approach 1:
The patent segments the electrode assembly structure by distinguishing between the outer circumferential surface (where the exposed portion contacts the housing for heat release) and the inner circumferential surface (where fixing means are applied). This segmentation allows the exposed portion to remain uncovered for effective thermal contact while using fixing means only where needed for structural stability during insertion.
Solution Approach 2:
The patent applies fixing means only at specific locations (inner circumferential surface of the outermost circumferential portion) rather than covering the entire terminal end. This local application of fixing means preserves the heat release function of the exposed portion while providing sufficient structural support for smooth insertion.
2Loss of energy
If the exposed portion of the negative electrode current collector contacts the exterior housing can, then the heat release efficiency is improved, but the structural stability deteriorates making insertion difficult
Solution Approach 1:
The patent introduces fixing means as an intermediary element that mediates between the electrode assembly and the exterior housing can. The fixing means provides the necessary structural support and guidance during insertion, while allowing the exposed portion to maintain contact with the housing for heat release.
Solution Approach 2:
The fixing means is applied in advance to the inner circumferential surface of the outermost circumferential portion before insertion. This preliminary action ensures structural stability is established beforehand, facilitating smooth insertion while preserving the heat release function.
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 allows for smooth insertion of the electrode assembly and efficient heat release, enhancing safety and capacity retention during charging and discharging cycles.
Implementation Method 1
the exposed portion contacts an exterior housing can to efficiently release heat generated in the event of an external short circuit via the exposed portion
Implementation Method 2
an inner circumferential surface of an outermost circumferential portion of the negative electrode located at an outermost circumference of the electrode assembly is provided with fixing means for fixing the outermost circumferential portion of the negative electrode to an inner circumferential side portion facing the inner circumferential surface
Data Source
AI summary
A cylindrical battery comprises an electrode body obtained by winding an elongated positive electrode and an elongated negative electrode with a separator interposed therebetween. An exposed portion where a negative electrode current collector is exposed is arranged on at least a part of the outermost peripheral surface of the electrode body. Double sided tapes that fix an outermost peripheral portion of the negative electrode located on the outermost periphery of the electrode body to an inner peripheral side portion facing the inner peripheral surface of the outermost peripheral portion are attached to the inner peripheral surface.