Electrode Layer Coating Gap Control for Stable Particle Distribution

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Solution Overview

Problem

Existing production apparatuses for electrode active material layers face challenges in stabilizing the formation of the layer due to excess granulated particles conveyed downstream, leading to defective formation and increased production costs, with previous solutions either failing to maintain stability or causing substrate distortion.

Innovation Solution

A production apparatus incorporating stock guides and a control unit with position measurement and gap adjustment mechanisms to manage the distance between stock guides and the substrate, ensuring the gap remains greater than 0 μm to prevent particle leakage and substrate distortion, while adjusting for variations in substrate position during rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If guide members are used to form areas where granulated particles are not deposited, then particle distribution is improved, but the substrate can be distorted and break due to physical contact and tension fluctuations

Engineering Contradiction:

Improveparticle distributionVSAvoidsubstrate integrity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

Air bearing blocks are introduced as an intermediary between the guide members and the substrate. These blocks generate air bearings that create a non-contact support mechanism, allowing the guide members to define particle deposition areas without physically touching the substrate, thereby preventing substrate distortion and breakage while maintaining precise particle distribution control

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system uses pneumatic air bearings to levitate the guide members above the substrate during the coating process. Compressed air is supplied to the air bearing blocks, creating a cushion of air that separates the guide members from the substrate, eliminating mechanical contact forces that would otherwise cause substrate deformation

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Manufacturing precision

If guide members physically contact the substrate to prevent particle overflow, then particle distribution is improved, but the guide members wear and fail to serve their function

Engineering Contradiction:

Improveparticle distributionVSAvoidguide member service life

Core Design Contradiction:

Manufacturing precisionVSDuration of action of stationary object

Solution Approach 1:

Air bearing blocks serve as an intermediary that eliminates direct contact between the guide members and the substrate. The air cushion created by these blocks allows the guide members to maintain their position for precise particle distribution without experiencing wear from friction or mechanical contact

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mechanical contact-based guidance system is replaced with a pneumatic field-based system. Instead of relying on physical contact forces to position and support the guide members, the system uses air pressure fields to levitate and position them, eliminating mechanical wear entirely

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If excess granulated particles are removed using dust suction or air purge devices, then particle distribution is improved, but production costs increase and stability is not achieved

Engineering Contradiction:

Improveparticle distributionVSAvoidproduction cost and stability

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The air bearing blocks prevent particle overflow in the first place by maintaining precise spacing between the guide members and the substrate before particles can escape. This preliminary preventive action eliminates the need for downstream particle removal systems, reducing production costs and improving process stability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The compressed air that could potentially cause particle disturbance is instead utilized beneficially to create air bearings that prevent particle overflow. The same pneumatic system that might seem to risk particle disruption actually serves to contain and control particle distribution precisely

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS20250018419A1Apparatus for manufacturing electrode active material layer

Publication Date: 2025.01.16 ZEON CORP

AI summary

A production apparatus of an electrode active material layer, comprising: a support unit; a feeding unit feeding prescribed granulated particles on or above the support unit; a first conveying unit; a squeegee unit; a first stock guide; a second stock guide; a first position measurement unit; a second position measurement unit; a rolling unit; a first gap adjustment unit; a second gap adjustment unit; and a control unit. The first position measurement unit measures a distance D1. The second position measurement unit measures a distance D2. The control unit causes the first gap adjustment unit to adjust a gap G1 based on a difference between the gap G1 obtained based on the distance D1 and a gap threshold T1 and causes the second gap adjustment unit to adjust a gap G2 based on a difference between the gap G2 obtained based on the distance D2 and a gap threshold T2.