Battery Electrode Plate Buffer Structure for Tab Bending Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery technology faces challenges in ensuring current flow capacity while minimizing defective rates of tabs during manufacturing, primarily due to tab deformation.
Innovation Solution
The introduction of an electrode plate design that includes a current collector with a coating region, a tab region, and a buffer region. The buffer region is positioned between the tab and coating regions to absorb bending stress, reducing damage to the tabs and the active material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tabs are made larger to ensure current flow capacity, then current carrying ability is improved, but tab deformation and damage during manufacturing increases
Solution Approach 1:
The current collector is divided into three functional regions: coating region, buffer region, and tab region. This segmentation allows each region to be optimized independently - the tab region provides large current flow capacity while the buffer region absorbs manufacturing stresses, resolving the contradiction between size and reliability.
Solution Approach 2:
The buffer region is designed in advance to absorb bending stresses and deformations that occur during manufacturing processes. This beforehand cushioning protects the tabs from damage while maintaining their large size for adequate current flow capacity.
2Reliability
If buffer region is added to reduce tab stress, then tab reliability is improved, but device complexity increases
Solution Approach 1:
The buffer region is merged into the current collector as an integrated structural component rather than a separate element. This merging approach reduces device complexity while still providing the necessary stress absorption function to improve tab reliability.
Solution Approach 2:
The buffer region serves multiple functions: it absorbs bending stress, prevents tab deformation, and maintains structural integrity during manufacturing. This multi-functionality reduces the need for additional components, thereby reducing overall device complexity.
3Quantity of substance
If tab portions are made wider to increase overcurrent area, then current flow capacity is improved, but bending difficulty increases
Solution Approach 1:
The current collector is segmented into distinct regions with the buffer zone positioned between the tab region and coating region. This segmentation allows wide tab portions for adequate overcurrent area while the buffer region facilitates easier bending by providing a transition zone that reduces stress concentration.
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 effectively reduces the risk of damage to the tabs and the active material layer, increasing the production yield of tabs and enhancing the overall reliability of the battery cells.
Implementation Method 1
the buffer portion is configured to absorb bending stress of the plurality of tab portions
Data Source
AI summary
An electrode plate, an electrode assembly, a battery cell, a battery, and an electrical apparatus are described. The electrode plate includes a current collector and an active material layer, the current collector includes a coating region, a tab region and a buffer region located between the coating region and the tab region, wherein the coating region, the tab region and the buffer region are arranged side by side in a first direction, the current collector includes a plurality of tab portions arranged side by side in a second direction in the tab region, and the first direction intersects the second direction; wherein the current collector includes a buffer portion in the buffer region, the buffer portion extends in the second direction and is connected with the plurality of tab portions, and the buffer portion is configured to absorb bending stress of the plurality of tab portions.