Rechargeable Battery Tab Bending Layout for Compact Welded Connections
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Solution Overview
Problem
Lithium-ion batteries face challenges in maximizing energy density due to the space requirements for electrode connections, leading to reduced space utilization and safety concerns related to misalignment and potential short circuits.
Innovation Solution
The design incorporates a connecting member with a guiding plate and first connecting plate that extends in the width direction, allowing the electrode tab to protrude perpendicularly and be bent, reducing the longitudinal space occupied by connections and enhancing energy density while minimizing misalignment and safety risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the first connecting plate has a sufficient dimension in the longitudinal direction to ensure adequate welding area, then the current carrying capacity and welding strength are improved, but the space utilization of the electrode assembly decreases and energy density is reduced
Solution Approach 1:
The first connecting plate is bent along the width direction to extend toward or away from the plate surface of the guiding plate, transforming the connection geometry from a longitudinal extension into a three-dimensional configuration. This dimensional change allows the connecting plate to achieve sufficient welding area with reduced longitudinal dimension, thereby improving space utilization while maintaining welding strength.
2Strength
If the electrode tab has a larger thickness to ensure sufficient welding area, then the welding strength is improved, but the longitudinal space occupied increases and energy density decreases
Solution Approach 1:
The electrode tab is bent along the width direction to connect to the first connecting plate, changing the connection approach from longitudinal extension to lateral bending. This allows the electrode tab to achieve sufficient contact area for welding without increasing its thickness or longitudinal dimension, thus maintaining welding strength while reducing longitudinal space occupation.
3Manufacturing precision
If the connecting member is positioned further from the electrode assembly body to reduce misalignment, then the alignment precision is improved, but the longitudinal space required increases
Solution Approach 1:
The connecting member and electrode tab are bent along the width direction to create a three-dimensional connection structure. This lateral bending allows the connection to be formed closer to the electrode assembly body in the longitudinal direction while maintaining proper alignment through the bent configuration, thus reducing longitudinal space requirements without sacrificing alignment precision.
Data Source
AI summary
Provided is a rechargeable battery including an electrode assembly comprising an electrode assembly body and an electrode tab protruding from the electrode assembly body, and a connecting member comprising a guiding plate and a first connecting plate connected to the guiding plate. The guiding plate extends in a width direction and the first connecting plate extends away from a plate surface of the guiding plate along the width direction or extends toward the plate surface of the guiding plate along the width direction. The electrode tab has a stacked multi-layer structure, the electrode tab protrudes from a portion of an end surface of the electrode assembly body in a longitudinal direction at a side of a split of the electrode assembly body perpendicular to the width direction, and the electrode tab is bent with respect to a longitudinal direction and is connected to the first connecting plate.