Lithium Battery Electrode Rolling with Local Heating for Wrinkle Control
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Solution Overview
Problem
The manufacturing process of lithium secondary battery electrodes often results in wrinkles and fractures due to partial deformation, affecting product quality and productivity.
Innovation Solution
A method of manufacturing an electrode for a lithium secondary battery involves applying an active material slurry to a current collector, dividing it into coated and uncoated parts, local heating of the uncoated part, and rolling operations to increase tensile strength and fracture length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the electrode is pressed between rollers in the rolling process to achieve target thickness, then the battery cell density is improved, but wrinkles and fractures occur due to partial deformation
Solution Approach 1:
The patent applies local heating to the uncoated part of the current collector before rolling, creating a localized thermal treatment zone. This local quality change modifies the material properties specifically in the uncoated region, allowing it to be more pliable during rolling while keeping the coated part intact, thus preventing wrinkles and fractures while achieving target thickness
2Strength
If the electrode is heated locally to increase tensile strength, then the fracture resistance is improved, but the tensile strength may decrease in other regions
Solution Approach 1:
The patent divides the current collector into distinct coated and uncoated parts, and further segments the uncoated part into first and second uncoated parts with different heating treatments. The first uncoated part receives heating to increase tensile strength, while the second uncoated part is left unheated or differently heated, creating a gradient structure that balances fracture resistance with overall tensile strength uniformity
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 method significantly increases fracture length and minimizes the decrease in tensile strength, thereby improving the quality and productivity of lithium secondary battery electrodes.
Implementation Method 1
a heating operation of heating the uncoated part with a heater
Implementation Method 2
The heater may be a laser heater. A wavelength of the laser heater may be 600 to 1100 nm
Data Source
AI summary
A method of manufacturing an electrode for a lithium secondary battery comprises a slurry application operation of applying an active material slurry to a coated part excluding an uncoated part disposed at one edge of a current collector, and dividing the current collector into the coated part on which a slurry is applied and the uncoated part on which the slurry is not applied, a heating operation of heating the uncoated part with a heater, a first rolling operation of rolling the coated part with a first rolling roll, and a second rolling operation of rolling the uncoated part with a second rolling roll.