Battery Cell Annular Tab Structure for Lower Internal Resistance
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Solution Overview
Problem
Existing battery cells face challenges in improving overcurrent capability due to long conductive paths and high internal resistance, which affect charging efficiency and performance.
Innovation Solution
The battery cell design incorporates a current collecting member that connects the electrode terminal to a first annular portion of the tab, reducing the conductive path length and internal resistance, and includes a welded portion to enhance contact and uniform current density, along with specific geometric configurations to optimize the connection and reduce assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tab structure is used in battery cells, then the manufacturing process is simpler, but the conductive path is longer and internal resistance is higher
Solution Approach 1:
The tab is divided into multiple segments including a first annular portion, a second annular portion, and a connecting portion. This segmentation allows current to flow through multiple parallel paths, shortening the effective conductive path length and reducing internal resistance while maintaining manufacturability through standardized welding processes.
Solution Approach 2:
The tab structure transitions from a conventional linear or planar configuration to a three-dimensional annular configuration with multiple portions arranged in different spatial dimensions. The first and second annular portions are positioned at different heights and radial distances, creating multiple current flow paths that reduce resistance without significantly increasing manufacturing complexity.
2Ease of manufacture
If the electrode lead-out hole is positioned centrally on the cover, then assembly precision requirements are reduced, but the connection to the tab becomes more complex
Solution Approach 1:
The connection structure is segmented into multiple functional portions: the first annular portion connects to the electrode terminal, the second annular portion provides structural support, and the connecting portion links them together. This segmentation allows the central electrode lead-out hole to be positioned easily while maintaining efficient electrical connection through the distributed tab structure.
Solution Approach 2:
The annular tab structure serves multiple functions simultaneously: it provides electrical connection, structural support, current distribution, and positioning features. The first annular portion conducts current, the second annular portion provides mechanical strength, and the connecting portion ensures electrical continuity, making the overall structure versatile and reducing the need for additional components.
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 design enhances the overcurrent capability and charging efficiency of the battery cell by shortening the conductive path, reducing internal resistance, and simplifying the assembly process, while maintaining stability and sealing performance.
Implementation Method 1
the first tab comprises a first annular portion... the current collecting member is configured to connect the first annular portion to the electrode terminal... currents in the electrode assembly can flow to the electrode terminal through the first annular portion and the current collecting member
Implementation Method 2
the first annular portion is welded to the current collecting member to form a first welded portion. The first welded portion can reduce contact resistance between the current collecting member and the first annular portion
Data Source
AI summary
The present application provides a battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device. The battery cell according to an embodiment of the present application 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, the first annular portion is arranged opposite to the cover.