Battery Electrode Tab Tape Layout for Uncoated Edge Crack Prevention
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Solution Overview
Problem
Secondary batteries experience cracks due to continuous stress from high volume expansion during charging and discharging, leading to inefficient electron movement, increased resistance, and potential safety issues such as heat generation and fire.
Innovation Solution
An electrode design featuring a coated portion with an active material layer and an uncoated portion, where a tab is fixed, and a tape is attached adjacent to the uncoated portion to mitigate stress and prevent cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode structure uses a tab fixed to the electrode plate for current collection, then the electrical connection is improved, but crack generation increases due to continuous stress from volume expansion
Solution Approach 1:
A buffer layer is introduced between the tab and the electrode plate to act as a stress-absorbing intermediary. This buffer layer absorbs the continuous stress generated during charging and discharging, preventing direct stress transmission to the electrode plate and thereby preventing crack generation while maintaining electrical connection reliability
Solution Approach 2:
The buffer layer is designed as a flexible thin film structure that can deform and absorb stress during volume expansion and contraction. This flexible structure accommodates the mechanical stress without breaking, preventing cracks in the electrode plate while maintaining the electrical connection pathway
2Quantity of substance
If the electrode plate undergoes volume expansion during charging and discharging, then the battery capacity is improved, but crack generation increases due to continuous stress
Solution Approach 1:
The buffer layer serves as a mediator between the expanding electrode plate and the rigid tab structure, absorbing the mechanical stress from volume expansion and preventing crack propagation while allowing the electrode plate to undergo necessary volume changes for high capacity
Solution Approach 2:
The buffer layer is pre-installed on the electrode plate before the tab is attached, providing beforehand cushioning against the stress that will be generated during subsequent charging and discharging cycles. This preventive measure stops cracks before they can form
3Productivity
If cracks occur in the electrode, then electron movement efficiency decreases, but resistance increases leading to heat generation and safety issues
Solution Approach 1:
The buffer layer prevents crack formation by absorbing stress, thereby maintaining the integrity of the electron conduction pathways in the electrode plate. This ensures continuous and efficient electron movement from the active material to the tab, preventing the harmful effects of increased resistance and heat generation
Data Source
AI summary
The present disclosure relates to an electrode, and a technical problem to be solved is to provide an electrode capable of suppressing cracks from occurring in an uncoated portion. The present disclosure provides an electrode including: an electrode plate including a coated portion, which is a region in which an active material layer is applied on a substrate, and an uncoated portion, which is a region in which the active material layer is not applied on the substrate; a tab fixed to at least a part of the uncoated portion and protruding from the electrode plate; and a tape adjacent to the tab and attached onto the uncoated portion.