Battery Cell Tab Insulation Layout to Prevent Tearing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The issue of tab tearing in secondary batteries arises due to the bonding force between the insulation component and the tab when it is unfolded, bent, or moved, leading to stress concentration and potential breakage.
Innovation Solution
The design includes an insulation component with a part of the tab from a first joint to a second joint that is not fixed, allowing stress relief during unfolding, bending, or moving, thereby reducing tension and the risk of tab breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation component is covered on the tabs to protect the tabs, then the tabs are protected from damage, but the bonding force between the insulation component and the tab causes stress concentration and tab tearing when the tab is unfolded, bent, or moved
Solution Approach 1:
The insulation component is divided into multiple independent insulators (first insulator, second insulator, third insulator) positioned at different locations on the tab. This segmentation allows each insulator to independently provide protection without creating concentrated bonding stress, as the bonding force is distributed across multiple separate attachment points rather than a continuous bonded surface.
Solution Approach 2:
Insulation is applied locally at specific critical positions (first insulator at the tab root, second insulator at the bending radius position, third insulator at the connection position) rather than covering the entire tab surface. This localized insulation approach provides protection where most needed while minimizing bonding area and associated stress concentration on the tab material.
2Reliability
If the insulation component is covered on the tabs, then the tabs are protected, but the manufacturing complexity and adhesive material usage increase
Solution Approach 1:
The insulation component is segmented into multiple independent insulators that can be separately manufactured and positioned. This segmentation simplifies the manufacturing process compared to creating a single complex continuous insulation piece, as each insulator can be produced using standard processes and then assembled in specific locations.
Solution Approach 2:
Instead of providing complete continuous insulation coverage on the tab, the solution uses partial insulation at only the critical positions where protection is most needed. This partial action approach reduces adhesive material usage and manufacturing complexity while still achieving the essential protection function.
Data Source
AI summary
Embodiments of this application provide a cell, a battery, and an electric device. The cell includes: an electrode lead-out portion, configured to lead out electric energy of the cell; an electrode assembly, including a main body and a tab, the tab including a transition portion and a connecting portion, where the transition portion is connected between the connecting portion and the main body, and the connecting portion is connected to the electrode lead-out portion to form a connecting region; and an insulation component, where the insulation component includes a first insulator fixed to the main body and a third insulator fixed to the connecting portion, and the insulation component further includes a second insulator connected between the first insulator and the third insulator, where a part of the tab from a first joint to a second joint is not fixed to the insulation component.


