Bent Electrode Tab Connection for Compact High-Density Batteries
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Solution Overview
Problem
Existing rechargeable batteries face challenges in achieving high energy density due to the need for a sufficient welding area between the connecting plate and electrode tab, which occupies excessive space and results in low space utilization and energy density.
Innovation Solution
The rechargeable battery design includes a connecting member with a guiding plate, first connecting plate, and second connecting plate, where the first connecting plate extends in the width direction, and the electrode tab is bent to connect with the first connecting plate, reducing the longitudinal space occupation and utilizing the width direction for the connecting member, while a protrusion on the guiding plate alleviates stress and prevents short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first connecting plate is made sufficiently large in the longitudinal direction to ensure adequate welding area, then the welding area between the connecting plate and electrode tab is sufficient, 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 instead of extending in the longitudinal direction, transforming the spatial arrangement from a longitudinal extension to a lateral/bent configuration. This dimensional change allows the connecting plate to maintain sufficient welding area while occupying less longitudinal space, thereby improving space utilization and energy density
2Power
If the first connecting plate is extended in the longitudinal direction to meet high-current requirements, then the welding area is sufficient for high-current operation, but the battery occupies more space and energy density decreases
Solution Approach 1:
The connecting plate is configured to extend and bend primarily in the width direction rather than the longitudinal direction, utilizing a different spatial dimension to achieve the necessary welding area for high-current operation without increasing the battery's longitudinal footprint, thus maintaining compact battery volume
Solution Approach 2:
The first connecting plate is designed with a bent configuration that allows flexible arrangement of the welding area. The bending enables the connecting plate to achieve sufficient welding surface area for high-current capability while adapting to the available space within the battery, optimizing the balance between power output and volume
Data Source
AI summary
The present disclosure provides a rechargeable battery, including an electrode assembly and a connecting member. The electrode assembly includes an electrode assembly body and an electrode tab extending from an end surface of the electrode assembly body. The connecting member includes a guiding plate, a first connecting plate and a second connecting plate respectively connected to the guiding plate. The first connecting plate, the second connecting plate and the guiding plate extend along a width direction. The electrode tab is bent with respect to a longitudinal direction to form a bending part and the bending part of the electrode tab is connected to the first connecting plate. The width direction is to a thickness direction of the rechargeable battery.