Annular Tab Battery Cell Layout for Shorter Current Paths
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Solution Overview
Problem
Existing battery cells face challenges in improving overcurrent capability and charging efficiency due to long conductive paths and high internal resistance caused by the connection of the electrode terminal to the inner turns of the tab, limiting their performance.
Innovation Solution
The electrode terminal is connected to the tab through a first connecting portion that extends between the cover and an annular portion of the tab, reducing the conductive path and internal resistance by shortening the connection distance and enhancing the overcurrent capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal is connected to the inner turns of the tab, then the structural stability is improved, but the conductive path length increases and internal resistance increases
Solution Approach 1:
Instead of connecting the electrode terminal to the inner turns of the tab as in conventional designs, this patent inverts the connection approach by connecting to the outer peripheral portion of the tab. This inversion shortens the conductive path from the active material to the terminal, reducing internal resistance while maintaining structural stability through the first connecting portion extending between the cover and the tab.
2Reliability
If the electrode terminal is connected to the inner turns of the tab, then the structural stability is improved, but the overcurrent capability deteriorates
Solution Approach 1:
The patent inverts the conventional connection approach by connecting the electrode terminal to the outer peripheral portion of the tab rather than inner turns. This reduces the conductive path length and internal resistance, thereby improving overcurrent capability while maintaining structural stability through the first connecting portion that extends between the cover and the tab.
Solution Approach 2:
The patent applies local quality by concentrating the connection structure at specific locations: the first connecting portion extends between the cover and the outer peripheral portion of the tab, creating a localized high-conductivity path. The welding structure is specifically positioned at the outer peripheral portion where it provides both mechanical support and electrical connection, optimizing local properties for both stability and overcurrent capability.
3Power
If the first connecting portion is welded to the first annular portion, then the contact resistance is reduced and overcurrent capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the connection function and support function into a single integrated structure. The first connecting portion serves dual purposes: it provides mechanical support by extending between the cover and the tab, and it provides electrical connection through welding to the first annular portion. This merging reduces the need for separate components while achieving both structural and electrical requirements.
Solution Approach 2:
The first connecting portion exhibits multi-functionality by simultaneously serving as a mechanical support structure and an electrical connection path. The welded connection to the first annular portion creates a universal interface that provides both structural stability and low-resistance electrical contact, reducing manufacturing complexity despite the welding requirement.
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 configuration improves the overcurrent capability and charging efficiency by reducing internal resistance and contact resistance, while also simplifying the assembly process and enhancing safety through strategic welding and insulation designs.
Implementation Method 1
the first connecting portion is at least partially located between the cover and the first annular portion and is configured to connect the first annular portion in such a way that the first tab is electrically connected to the electrode terminal
Data Source
AI summary
A battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device are provided. The battery cell comprises: an electrode assembly comprising a first tab, wherein the first tab is arranged around a central axis of the electrode assembly; a housing configured to accommodate the electrode assembly, wherein the housing comprises a barrel and a cover connected to the barrel, the barrel is arranged around a periphery of the electrode assembly, the cover is provided with an electrode lead-out hole, the central axis extends in a first direction and passes through the electrode lead-out hole, the first tab comprises a first annular portion, and a projection of the first annular portion in the first direction does not overlap with a projection of the electrode lead-out hole in the first direction; and an electrode terminal comprising a columnar portion.