Electrode Sheet Tab Structure for Conductive Current Collectors
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Solution Overview
Problem
Conventional lithium-ion battery current collectors with polymer layers are non-conductive, leading to electrical disconnection and safety issues during short circuits, as the polymer layer can separate the current collector structure, preventing effective conduction between the positive and negative electrodes.
Innovation Solution
The electrode sheet features a current collector with a base layer, first and second conductive layers on opposite sides, divided into zones with a through hole allowing communication between sides, and a tab piece connecting the conductive layers, ensuring mutual conduction and enhancing safety and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a polymer layer is used in the current collector to reduce weight and increase energy density, then the weight of the battery is reduced and energy density is increased, but the current collector structure is separated and cannot be electrically connected
Solution Approach 1:
The current collector is divided into multiple zones: a first zone with the polymer layer for weight reduction, a second zone without the polymer layer for electrical connection, and a third zone with the polymer layer. This segmentation allows different regions to serve different functions - the polymer zones reduce weight while the metal zone ensures reliable electrical connection.
Solution Approach 2:
Different regions of the current collector are given different properties: the first and third zones have the polymer layer applied to reduce weight, while the second zone maintains the metal foil structure to provide electrical connection. This local differentiation resolves the contradiction between weight reduction and electrical reliability.
2Quantity of substance
If the polymer layer is applied to the current collector to reduce weight, then energy density is increased, but the conductive layers on both sides cannot be electrically connected
Solution Approach 1:
The current collector is segmented into zones with and without polymer coating. The second zone maintains the conductive metal structure to enable electrical connection between conductive layers, while the first and third zones with polymer coating contribute to weight reduction and energy density improvement.
Solution Approach 2:
The second zone of the current collector acts as an intermediary conductive path that bridges the conductive layers on both sides. This metal zone mediates the electrical connection that would otherwise be blocked by the non-conductive polymer layers in the first and third zones.
3Weight of moving object
If part of the aluminum or copper foil is replaced with polymer material, then the weight is reduced, but the current collector structure is separated by the non-conductive polymer layer
Solution Approach 1:
The current collector is divided into distinct zones with different structures. The first and third zones contain the polymer layer for weight reduction, while the second zone maintains the metal foil structure. This segmentation creates a manageable multi-zone structure that balances weight reduction with structural functionality.
Solution Approach 2:
The current collector uses a composite structure combining polymer material and metal foil material in different zones. This composite approach allows the polymer to provide weight reduction benefits while the metal provides structural integrity and electrical conductivity where needed.
Data Source
AI summary
An electrode sheet, a preparation method thereof, and a lithium ion battery are provided in this application. The electrode sheet includes a current collector, an active material layer and a tab piece; the current collector comprises a base layer, and first and second conductive layers; the current collector is divided into first and second zones; the tab piece is connected to the second zone of the current collector; the second zone is provided with a through hole for enabling opposite sides of the current collector to be communicated with each other; one part of structure of the tab piece is connected to the first conductive layer, and the other part of structure of the tab piece extends through the through hole to a side of the current collector opposite to the first conductive layer and is connected to the second conductive layer.