Battery Electrode Tab Opening to Prevent Folding and Overlap
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Solution Overview
Problem
During the manufacturing of electrode plates for battery cells, the tab portion is prone to folding, leading to reduced overcurrent areas, increased heat generation, and a higher risk of short circuits due to overlapping with the body portion, which compromises safety performance and capacity.
Innovation Solution
An electrode plate design featuring a tab portion with an opening that penetrates in the thickness direction, allowing elastic deformation and reducing folding stress, thereby minimizing heat generation and preventing overlap with the body portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the tab portion is folded during manufacturing, then the welding area is reduced, but the overcurrent area becomes insufficient
Solution Approach 1:
The tab portion is segmented by introducing openings that divide it into multiple regions. This segmentation allows the tab to accommodate folding stresses without compromising the overall welding area or overcurrent area, as the openings create flexible zones that can deform independently while maintaining the integrity of the current-carrying surfaces.
Solution Approach 2:
The physical structure of the tab portion is changed by adding openings, which alters its mechanical properties. The openings enable the tab to undergo elastic deformation and release folding stresses, thereby maintaining sufficient welding area and overcurrent area even when folding occurs during manufacturing.
2Manufacturing precision
If the tab portion is folded, then the welding area is reduced, but heat generation increases
Solution Approach 1:
The tab portion is divided into multiple regions by openings, creating flexible zones that can deform independently. This segmentation allows the tab to accommodate folding stresses without reducing the welding area, thereby preventing excessive heat generation during charging and discharging cycles.
Solution Approach 2:
The structural parameters of the tab portion are modified by introducing openings, which change its mechanical behavior. The openings enable stress release through elastic deformation, maintaining adequate welding area and preventing the heat generation problems associated with folded tabs.
3Quantity of substance
If the tab portion overlaps with the body portion, then the capacity is reduced, but short circuit risk increases
Solution Approach 1:
The tab portion is segmented by openings into multiple regions that can move independently. This segmentation prevents the tab from overlapping with the body portion by allowing the opened regions to accommodate folding stresses, thereby maintaining battery capacity and reducing short circuit risks.
Solution Approach 2:
The structural parameters of the tab portion are changed by adding openings, which modify its deformation characteristics. These openings enable the tab to release folding stresses through elastic deformation, preventing overlap with the body portion and maintaining both capacity and safety.
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
The design enhances safety performance by reducing heat and preventing short circuits, while maintaining the capacity of the battery cell by minimizing folding and crease formation during charging and discharging.
Implementation Method 1
the opening enables the electrode plate to generate an elastic deformation at the opening when the tab portion generates a folding stress during manufacturing
Data Source
AI summary
Provided is an electrode plate, an electrode assembly, a battery cell, a battery, and an electric device. The electrode plate includes: a body portion having a surface at least partially coated with an active material; a tab portion arranged on at least one side of the body portion and connected to the body portion; and an opening penetrating the tab portion in a thickness direction of the tab portion. The opening has a first end and a second end that are sequentially arranged away from the body portion. The opening extends from the first end to the second end along a predetermined path. In the electrode plate of embodiments of the present disclosure, an occurrence of folding of the tab portion of the electrode plate during manufacturing can be reduced, avoiding an insufficient overcurrent area of the tab portion.