Lithium Ion Battery Electrode Manufacturing Apparatus
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Solution Overview
Problem
The existing methods for manufacturing lithium ion secondary battery electrodes using granulated particles face challenges in achieving uniform distribution and basis weight due to poor flowability, leading to uneven particle accumulation and reduced quality.
Innovation Solution
An apparatus comprising a conveying mechanism, supply unit, squeegee, adjustment unit, rolling rolls, height sensor, and control unit is used to stabilize the accumulation of granulated particles, ensuring uniform distribution and improved basis weight by adjusting the accumulation height and supply amount, and incorporating a liquid binder for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If granulated particles are supplied onto the collector surface, then the active material layer is formed, but the particles are unevenly distributed due to poor flowability
Solution Approach 1:
A liquid binder is introduced as an intermediary substance between the granulated particles and the collector. The binder coats the collector surface first, creating a sticky layer that helps poor-flowing granulated particles adhere uniformly and distribute evenly across the collector, solving the flowability problem without requiring the particles to flow well on their own.
Solution Approach 2:
The liquid binder is applied to the collector surface before the granulated particles are supplied. This preliminary action prepares the collector surface to receive and hold the particles uniformly, ensuring that when the particles are supplied, they are distributed evenly even though they have poor inherent flowability.
2Manufacturing precision
If a squeegee roll is used to level the granulated particles, then the particle distribution is improved, but the amount of particles passing through may still be uneven
Solution Approach 1:
A detection device (such as a sensor) is installed to monitor the amount of granulated particles in real-time. This detection information is fed back to a control device, which automatically adjusts the supply amount to maintain uniform particle distribution and basis weight, compensating for variations in particle flow.
Solution Approach 2:
The supply amount of granulated particles is dynamically adjusted based on detected conditions. By changing the supply parameter (amount, rate, or timing) in response to real-time measurements, the system maintains uniform particle distribution despite variations in particle flowability.
3Manufacturing precision
If the supply amount of granulated particles is controlled precisely, then the basis weight is accurate, but the control complexity increases
Solution Approach 1:
The system uses automatic detection and control mechanisms that monitor and adjust the particle supply process without requiring complex external intervention. The detection device and control device work together to self-regulate the supply amount, achieving accurate basis weight control through automated feedback rather than complex manual or external control systems.
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 high-quality electrode with improved uniformity and bonding strength, capable of maintaining consistent basis weight and yield, even with uneven particle supply, effectively addressing the issues of poor flowability and uneven distribution.
Implementation Method 1
The squeegee levels the supplied granulated particles
Implementation Method 2
The rolling rolls roll the leveled granulated particles and form the active material layer
Implementation Method 3
incorporating a liquid binder for enhanced bonding
Data Source
AI summary
Provided is an apparatus for manufacturing an electrode for a lithium ion secondary battery that makes it possible to form a more uniform active material layer by using granulated particles. The manufacturing apparatus includes: a conveying mechanism, a supply unit, a squeegee, an adjustment unit, and rolling rolls. The conveying mechanism conveys a collector. The supply unit supplies granulated particles, including active material particles and a binder, onto the surface of the conveyed collector. The squeegee levels the supplied granulated particles. The adjustment unit is disposed upstream of the squeegee. The adjustment unit controls the accumulation height of the granulated particles accumulated upstream of the squeegee. The rolling rolls roll the leveled granulated particles and form the active material layer.