Battery Current Collector Tab Depression for Rigidity
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Solution Overview
Problem
Current batteries face deformation and short circuit issues due to the low rigidity of current collector tabs when a filler is introduced between the power generating element and the exterior body, causing contact with adjacent counter electrodes.
Innovation Solution
Incorporating depressions on the current collector tabs, positioned inward from the center, enhances their rigidity and prevents deformation, thereby preventing short circuits by maintaining proper alignment and contact with terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filler is poured into the space between the power generating element and the exterior body, then the battery structure is completed and protected, but the current collector tabs deform due to low rigidity causing short circuits
Solution Approach 1:
The patent introduces a depth dimension to the current collector tab by forming depressions on its surface. This dimensional modification creates an I-shaped cross-section that significantly enhances rigidity without increasing the planar footprint, allowing the tab to resist deformation from filler pouring while maintaining proper electrical contact
Solution Approach 2:
The patent changes the geometric parameters of the current collector tab by introducing depressions with specific dimensions (depth of 0.1-5mm, occupying 10-80% of tab width). This parameter modification transforms the tab from a flat, flexible structure to a three-dimensional form with elevated rigidity, preventing short circuits during filler installation
Data Source
AI summary
Provided is a battery that can suppress a short circuit that is caused by deformation of a current collector tab. The battery includes: an external body; a power generating element housed in the exterior body; and a filler placed between the power generating element and the exterior body, wherein the power generating element has the current collector tab extending outward, and the current collector tab has at least one depression, at least part of the depression being positioned on an inner side of the current collector tab than a center of a length of the current collector tab in an extending direction.