Composite Electrode Sheet With Short-Circuit Protection Layer
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Solution Overview
Problem
Existing lithium-ion batteries face challenges in achieving high energy density and safety performance due to performance degradation issues related to processing performance and electrochemical performance.
Innovation Solution
The development of an electrode plate with a composite current collector featuring a thin conductive layer and a polymer support layer, along with an internal-short-circuit protection layer, to enhance energy density and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a plastic current collector coated with a metal layer is used, then energy density is increased, but processing performance and electrochemical performance deteriorate
Solution Approach 1:
The patent uses a composite current collector structure consisting of a polymer support layer and a metal conductive layer. The polymer support layer (e.g., polyolefin) provides mechanical strength and processing stability, while the thin metal conductive layer (30nm-2μm) provides electrical conductivity. This composite structure achieves high energy density through weight reduction while maintaining processing and electrochemical performance through the synergistic combination of materials with complementary properties.
2Weight of moving object
If the conductive layer thickness is reduced to increase energy density, then weight energy density improves, but the current collector becomes more susceptible to damage and short-circuits
Solution Approach 1:
The patent combines a thin metal conductive layer (30nm-2μm) with a polymer support layer to create a composite current collector. The thin metal layer reduces weight for higher energy density, while the polymer support layer compensates for the reduced mechanical strength and short-circuit resistance, preventing damage and maintaining reliability.
Solution Approach 2:
The polymer support layer acts as an intermediary between the thin metal conductive layer and the electrode active material. It provides mechanical support and electrical insulation, preventing direct contact between the thin metal layer and opposing electrodes, thereby preventing short-circuits while allowing the thin metal layer to function effectively for electrical conduction.
3Weight of moving object
If a thinner current collector is used to reduce component weight, then weight energy density increases, but manufacturing precision and structural integrity deteriorate
Solution Approach 1:
The patent employs a composite current collector with a polymer support layer and a metal conductive layer. The polymer support layer provides excellent mechanical properties and dimensional stability for precise manufacturing, while the thin metal layer minimizes weight. This composite structure achieves component weight reduction without sacrificing manufacturing precision or structural integrity.
Data Source
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AI summary
This application relates to an electrode plate, an electrochemical apparatus, and an apparatus thereof. The electrode plate in this application includes a current collector, an electrode active material layer disposed on at least one surface of the current collector, and an electrical connection member electrically connected to the current collector. The electrode active material layer is disposed on a main body portion of the current collector at a zone referred to as a film zone, the electrical connection member and the current collector are welded and connected at an edge of the current collector at a welding zone referred to as a transfer welding zone, and a transition zone of the current collector between the film zone and the transfer welding zone, coated with no electrode active material layer, is referred to as an extension zone. The current collector is a composite current collector. The electrode plate further includes an internal-short-circuit protection layer, and the internal-short-circuit protection layer is an organic insulation layer and covers the electrical connection member in the transfer welding zone and at least a part of the extension zone.