Joule Heating Bonding for Lithium Metal Anode Adhesion
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Solution Overview
Problem
Existing methods for manufacturing battery cell electrodes, particularly for electric vehicles, face challenges in creating a strong bond between metal electrode layers and current collectors, which is crucial for lithium metal anodes to withstand vehicle use.
Innovation Solution
The method involves using rollers with different materials to apply joule heating, causing current to flow through the metal electrode and current collector layers, resulting in localized heating that softens the metal and enhances bonding quality, allowing for improved adhesion and reduced rolling force or increased speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bonding methods are used to bond metal electrode layers to current collectors, then the bonding process is simple and quick, but the bond strength is insufficient for lithium metal anodes to withstand vehicle use
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional cold bonding to hot rolling with temperatures exceeding the recrystallization temperature of the metal electrode layer. This temperature parameter change enables metallurgical bonding and significantly enhances bond strength between the lithium metal anode and current collector, making the electrode structure capable of withstanding vehicle use conditions.
Solution Approach 2:
The patent utilizes phase transitions by heating the metal electrode layer above its recrystallization temperature during the bonding process. This phase transition enables the metal to undergo recrystallization and metallurgical bonding with the current collector, creating a strong, durable bond that conventional room-temperature methods cannot achieve.
2Strength
If hot rolling is used to bond metal electrode layers, then bond strength is improved, but energy consumption increases due to heating requirements
Solution Approach 1:
The patent replaces conventional external heating systems with inductive heating that generates heat directly within the metal electrode layer through electromagnetic induction. This substitution of heating mechanism reduces energy loss and improves heating efficiency, thereby reducing overall energy consumption while achieving the required bond strength through hot rolling.
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 approach results in a stronger bond between the metal electrode and current collector layers, enhancing the durability and performance of lithium metal anode electrodes in battery cells.
Implementation Method 1
supplying current through the first roller, the first metal electrode layer, the current collector layer, and the second roller to cause joule heating and bonding of the first metal electrode layer, the current collector layer, and the second metal electrode layer
Data Source
AI summary
A method for bonding a metal electrode layer and a current collector includes supplying a first metal electrode layer, a current collector layer, and a second metal electrode layer for a battery cell between a first roller and a second roller; connecting a power supply to the first roller and the second roller; and supplying current through the first roller, the first metal electrode layer, the current collector layer, and the second metal electrode layer and the second roller to cause joule heating and bonding of the first metal electrode layer, the current collector layer, and the second metal electrode layer.