Electrode Sheet Through-Hole Tab Structure for Dual-Sided Conduction
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Solution Overview
Problem
Conventional lithium-ion batteries face challenges in achieving high energy density due to the use of non-conductive polymer materials in current collectors, which hinder effective conduction across both surfaces, necessitating a new welding method to connect tabs.
Innovation Solution
An electrode plate design with a current collector that includes a conductive layer, insulation layer, and through holes allowing a tab to penetrate and connect both surfaces, ensuring conductivity and safety features like a protective layer to enhance energy density and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a polymer material is used as current collector to reduce weight and improve energy density, then weight and energy density are improved, but electrical conductivity is lost requiring new welding methods
Solution Approach 1:
The current collector uses a composite structure combining polymer material (for lightness and safety) with conductive material layers (for electrical conductivity). The conductive material is disposed on at least one surface of the polymer current collector, creating a multi-functional composite that simultaneously achieves weight reduction and maintains electrical conductivity.
2Reliability
If conventional aluminum or copper foil is used as current collector, then electrical conductivity is maintained, but weight and energy density are suboptimal
Solution Approach 1:
The invention replaces heavy conventional metal foils with a composite structure using lightweight polymer as the base material, reducing weight while maintaining conductivity through added conductive material layers. This achieves better weight-to-conductivity ratio than conventional pure metal foils.
Solution Approach 2:
The invention changes the material composition parameters of the current collector, transitioning from pure metal (high conductivity, high weight) to polymer-composite (lower weight, maintained conductivity through conductive additives). This parameter optimization achieves improved energy density while maintaining electrical performance.
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 enables effective conduction across both surfaces of the current collector, improving energy density and safety by allowing the tab to connect both surfaces through holes, while maintaining a suitable distance and protective layer to prevent damage.
Implementation Method 1
the tab passes through the through hole to conduct the first function surface and the second function surface of the current collector
Data Source
Figure 1~3
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Figure 7~9
AI summary
The present application provides an electrode plate and an application thereof. A first function surface of a current collector in the electrode plate includes a first active layer region and a first tab region, a second function surface of the current collector includes a second active layer region corresponding to the first active layer region and a second tab region corresponding to the first tab region, and an active layer is disposed in the first active layer region and/or the second active layer region. The first tab region is provided with N through holes penetrating to the second tab region, a tab passes through a through hole, and a first section of the tab is connected to the first tab region to form a first connection region and a second section of the tab is connected to the second tab region to form a second connection region, where N ≥ 1. In the present application, a first tab region is provided with a through hole penetrating to a second tab region, a tab passes through the through hole, and two ends of the tab are respectively connected to the first tab region and the second tab region, so that two sides of a current collector may be conducted, thereby improving energy density of a lithium-ion battery.