Resin Current Collector Electrode Sheet for Heat-Safe Power Extraction
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Solution Overview
Problem
Existing secondary batteries face challenges in improving energy density, safety, and manufacturing efficiency while maintaining low ohmic resistance and preventing heat generation during abnormal conditions.
Innovation Solution
The secondary battery design incorporates a current collector with a resin layer and multiple current collecting layers, bonded to metal sheets with extending parts and bonding marks, allowing for efficient heat dissipation and electrical connection, enhancing the battery's structural integrity and power extraction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current collector with resin layer and multiple current collecting layers is used, then safety and heat dissipation are improved, but device complexity increases
Solution Approach 1:
The current collector is divided into multiple functional layers: a resin layer for safety and heat dissipation, and multiple current collecting layers for electrical conduction. This segmentation allows each layer to perform its specific function independently, improving overall safety without compromising electrical performance.
Solution Approach 2:
The current collector uses a composite structure combining resin material for thermal management and safety with conductive materials for current collection. This composite approach enables simultaneous achievement of safety requirements and electrical performance without significant complexity increase.
2Power
If metal sheets with extending parts and bonding marks are bonded to current collecting layers, then electrical connection and power extraction are improved, but manufacturing complexity increases
Solution Approach 1:
The metal sheets are pre-formed with extending parts and bonding marks before assembly. This preliminary preparation allows for faster and more accurate bonding during manufacturing, improving power extraction capability while reducing assembly complexity and time.
3Power
If bonding marks are formed along the longitudinal direction, then electrical resistance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The bonding marks are designed with specific parameters including longitudinal orientation and optimized dimensions. This parameter optimization reduces electrical resistance by maximizing bonding area and improving current distribution, while the standardized parameters make the bonding process more controllable and less demanding on precision.
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
The design improves energy density, safety, and manufacturing efficiency by effectively dissipating heat and reducing electrical resistance, ensuring continuous power extraction even under abnormal conditions.
Implementation Method 1
a first metal sheet that is bonded to one end of the first current collecting layer in the lateral direction
Implementation Method 2
has a first bonding mark formed along the longitudinal direction by the bonding
Data Source
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AI summary
There is provided a technique for improving the usefulness of a lithium secondary battery. An electrode sheet 1 has a longitudinal direction and a lateral direction and constitutes an electrode of a secondary battery 2 by being wound with the lateral direction as an axial direction. The electrode sheet 1 includes a current collector 3 that includes a resin layer 10, and a first current collecting layer 12a and a second current collecting layer 12b that are respectively provided on both surfaces of the resin layer 10; a first active material layer 16a that is provided on a surface of the first current collecting layer 12a on a side opposite to the resin layer 10; and a first metal sheet 20a that is bonded to one end of the first current collecting layer 12a in the lateral direction and has a first bonding mark 24a formed along the longitudinal direction by the bonding, where the first metal sheet 20a has a first extending part 40a that extends from the first current collecting layer 12a in the lateral direction.