Stacked Electrode Tab Structure for Stable Current Carrying
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Solution Overview
Problem
Existing battery technologies face challenges with short cycle life and safety hazards due to inadequate current-carrying performance and structural stability of electrode tabs, leading to local temperature rises and potential risks during use.
Innovation Solution
A stacked-type electrode assembly is designed with a first electrode plate and a second electrode plate of opposite polarities, where the first electrode plate includes a coated region and a blank region with a connecting portion and a tab portion. The connecting portions converge to form a convergence region, and the tab portions protrude beyond this region to enhance current-carrying performance and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the tab portion has a small cross-sectional area to reduce material usage, then the manufacturing cost decreases, but the current-carrying performance deteriorates causing local temperature rise
Solution Approach 1:
The patent extends the connecting portion in the thickness direction (third direction) to create a convergence region, transforming a two-dimensional tab structure into a three-dimensional configuration. This dimensional change increases the effective cross-sectional area for current flow without increasing the planar footprint, thereby improving current-carrying performance while maintaining material efficiency.
Solution Approach 2:
The connecting portion is designed to converge multiple electrode plate connections before reaching the tab portion, performing the current aggregation function in advance. This preliminary convergence ensures that the tab portion handles consolidated current flow, improving its current-carrying capacity without requiring the tab itself to have a larger cross-sectional area.
2Device complexity
If the tab portion has a small cross-sectional area, then the structural complexity decreases, but the structural stability deteriorates increasing breakage risk
Solution Approach 1:
By extending the connecting portion in the thickness direction to form a convergence region, the patent creates a three-dimensional structure that inherently distributes mechanical stresses. This dimensional addition provides structural reinforcement and stability without significantly increasing overall complexity, as the convergence region integrates naturally with the stacked electrode plate configuration.
3Reliability
If the connecting portion has sufficient flow area to improve current-carrying performance, then the current distribution improves, but the structural complexity increases
Solution Approach 1:
The patent divides the electrode plate structure into distinct functional regions: coated regions for electrochemical reactions, blank regions for current collection, and connecting portions for current transport. This segmentation allows the connecting portion to be optimized independently for current flow, with the convergence region providing sufficient flow area while maintaining clear structural boundaries that prevent excessive complexity.
Data Source
AI summary
A stacked-type electrode assembly, a battery cell, a battery, and an electrical device are disclosed. The stacked-type electrode assembly includes a first electrode plate and a second electrode plate of opposite polarities. The first electrode plate and the second electrode plate are stacked along a first direction. The first electrode plate includes a first coated region and a first blank region arranged along a second direction. The first blank region includes a first connecting portion and a first tab portion. The first connecting portion connects the first coated region and the first tab portion. A dimension of the first connecting portion is larger than a dimension of the first tab portion along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.