Battery Electrode Tab Welding Layout for Low-Resistance Current Flow
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Solution Overview
Problem
The existing electrode members in secondary batteries face issues with insufficient overcurrent areas due to thin conducting layers, leading to increased resistance and poor conductive performance, which affects the battery's overcharge capability and safety.
Innovation Solution
The electrode member design includes a conducting layer with a main portion and a transition portion, where the transition portion is wider than the main portion, and the welding region is positioned at the transition portion, ensuring a larger connecting area and improved conductive structure integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conducting layer thickness is increased to improve overcurrent area, then the conductive performance is improved, but the device complexity and manufacturing difficulty increase due to the laminated structure requirements
Solution Approach 1:
The conducting layer is segmented into three distinct portions: a first portion at the extreme end, a second portion extending from the first portion, and a third portion extending from the second portion. This segmentation allows each portion to serve specific functions (current collection, transition, and connection) while maintaining manufacturing feasibility through standardized lamination processes.
Solution Approach 2:
The patent transitions from considering only the thickness dimension of the conducting layer to utilizing the width dimension by creating portions with different widths. The first portion has a first width, the second portion has a second width greater than the first width, and the third portion has a third width greater than the second width. This dimensional transition solves the overcurrent area problem without increasing thickness.
2Reliability
If the width of the second portion is widened to improve overcurrent area, then the conductive capability is improved, but interference with mechanical members occurs reducing the width of the end portion
Solution Approach 1:
Different portions of the conducting layer are assigned different widths based on their functional requirements. The first portion has a smaller width suitable for active material coating, the second portion has an intermediate width for current collection, and the third portion has the largest width for optimal current conduction. This local quality variation ensures each region performs its function efficiently without unnecessary width increases throughout the entire structure.
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 area, reduces resistance, and improves the safety and performance of the secondary battery by allowing electric current to flow through a sufficient area, thereby increasing the reliability and safety of the battery.
Implementation Method 1
The conductive structure is welded with the second portion and extends along a direction away from the first portion
Data Source
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AI summary
The present invention relates to the field of energy storage device, and particularly relates to an electrode member, an electrode assembly and a secondary battery. The electrode member comprises an electrode body and a conductive structure. The conducting layer comprises a first portion having an active material and a second portion extending from the first portion; the second portion comprises a main portion and a transition portion, the transition portion is provided between the main portion and the first portion, and a width of the transition portion is larger than a width of the main portion. The conductive structure is welded with the second portion and extends along a direction away from the first portion, and at least a part of a welding region formed by the second portion and the conductive structure is positioned at the transition portion. The present invention can avoid the overcurrent area being significantly reduced caused by the main portion, ensure that every position the electric current passing through has a sufficient overcurrent area, and improve the safety performance of the secondary battery.