Insulated Battery Tab Group Structure for Sealing Plate Isolation
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Solution Overview
Problem
In existing secondary battery current collection structures, variations in electrode plate thickness and curvature can cause current collector tabs to shift, leading to potential contact between the tab group and the sealing plate, resulting in a loss of insulation and reduced performance.
Innovation Solution
Incorporating an insulating member with an extending portion between the current collector and the sealing plate to maintain insulation, even when the current collector tabs project from the collector due to shifting, thereby preventing contact with the sealing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the width of the current collector tab is expanded to increase battery output, then the power increases, but the tab group may contact the sealing plate causing insulation loss
Solution Approach 1:
An insulating member is introduced as an intermediary component between the current collector tab group and the sealing plate. This insulating member includes an extending portion that specifically covers the tab group, preventing direct contact between the conductive tab group and the sealing plate while allowing the tab width to be expanded for increased power output.
2Area of moving object
If the current collector tab width is increased, then more current collector area is needed, but the tab group position shifts due to manufacturing variations
Solution Approach 1:
The insulating member acts as a buffer that compensates for position shifts of the tab group caused by manufacturing variations in electrode plate thickness and curvature. The extending portion of the insulating member can accommodate positional deviations while maintaining insulation, allowing greater flexibility in tab width design.
3Area of stationary object
If the tab group is arranged close to the end portion of the current collector, then the tab width can be expanded, but the risk of tab projection and contact with sealing plate increases
Solution Approach 1:
The insulating member with its extending portion is positioned between the current collector tab group and the sealing plate, creating a protective barrier that allows the tab group to be arranged closer to the current collector end portion without risking harmful contact with the sealing plate.
Solution Approach 2:
The insulating member extends in the longitudinal direction of the sealing plate, adding a dimensional element that covers the tab group from a different spatial perspective, thereby preventing contact without restricting the tab width expansion.
Data Source
AI summary
A secondary battery includes an exterior body housing the electrode body, an external terminal provided outside a sealing plate sealing an opening of the exterior body, a connection member provided inside the sealing plate and connected to the external terminal, an insulating member provided between the sealing plate and the connection member, and a current collector disposed inside the sealing plate and connected to the connection member and a tab group including a plurality of current collector tabs extending from the electrode body. At least some of the current collector tabs of the tab group have a projecting portion projecting from the current collector in a longitudinal direction of the sealing plate. The insulating member has an extending portion at least extending between the projecting portion and the sealing plate along the longitudinal direction of the sealing plate.