All-Solid-State Battery Lamination Under Low-Dew-Point Pressing

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Solution Overview

Problem

Existing methods for manufacturing all-solid-state batteries face challenges in preventing moisture exposure and electrode warpage, leading to deteriorated battery characteristics and durability.

Innovation Solution

A manufacturing method involving lamination of electrodes and a solid electrolyte membrane under controlled dew point conditions (-40°C and 127 ppm moisture) followed by a predetermined time lapse before press molding, and subsequent sealing in an exterior case.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If assembly is performed rapidly under dew point control to minimize moisture exposure, then moisture ingress is reduced, but electrode warpage occurs due to insufficient time for stress relaxation

Engineering Contradiction:

Improvemoisture exposureVSAvoidelectrode warpage

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by performing stress relaxation treatment on the electrode laminate before press molding. The electrode laminate is held at a temperature of 50°C to 150°C for 1 hour to 7 days to allow internal stress to relax and prevent warpage during subsequent press molding, while the entire process is conducted under dew point control (-40°C) to minimize moisture exposure to the solid electrolyte

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an inert environment by maintaining dew point control at -40°C throughout the assembly process. This creates a low-moisture atmosphere that protects the chemically unstable sulfide solid electrolyte from moisture ingress, allowing sufficient time for stress relaxation without compromising the solid electrolyte's ionic conductivity

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Manufacturing precision

If assembly time is extended to allow stress relaxation and prevent warpage, then electrode flatness is improved, but moisture exposure increases leading to decreased ionic conductivity

Engineering Contradiction:

Improveelectrode flatnessVSAvoidionic conductivity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent maintains dew point control at -40°C throughout the extended assembly and stress relaxation process. This creates a protected low-moisture atmosphere that allows the electrode laminate to be held at elevated temperatures for stress relaxation (1 hour to 7 days) without compromising the solid electrolyte's ionic conductivity, thus achieving both electrode flatness and maintaining reliability

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Reliability

If sulfide solid electrolyte is used to achieve high ionic conductivity, then battery performance is improved, but chemical instability increases due to sensitivity to moisture

Engineering Contradiction:

Improveionic conductivityVSAvoidchemical stability

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent maintains dew point control at -40°C throughout the entire manufacturing process, from assembly to stress relaxation and press molding. This creates a protected low-moisture atmosphere that prevents moisture ingress to the sulfide solid electrolyte, preserving its high ionic conductivity while mitigating its chemical instability

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent performs stress relaxation treatment before press molding to prevent electrode warpage that could compromise the integrity of the solid electrolyte layer. This preliminary action ensures that the sulfide solid electrolyte maintains its structural integrity and high ionic conductivity throughout the manufacturing process

Inventive Principle:

Principle #10Preliminary action

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 all-solid-state battery with stable ionic conductivity and suppressed electrode warpage, ensuring improved electrical and durability characteristics.

Implementation Method 1

sulfide solid electrolyte is chemically unstable, and is known to have ionic conductivity that decreases due to moisture during atmospheric exposure

Methodology Applied

Scientific EffectMoisture absorption: Absorption (physical)

Implementation Method 2

a step of press molding the electrode laminate

Methodology Applied

Scientific EffectMechanical pressure: Compression

Data Source

PatentEP4693580A1Method for manufacturing all-solid-state battery

Publication Date: 2026.02.11 AESC JAPAN LTD

Figure 1

AI summary

The purpose of the present invention is to provide a method for manufacturing an all-solid-state battery with which warping of an electrode multilayer body is prevented, and deterioration of characteristics does not occur. The present invention provides a method for manufacturing an all-solid-state battery, the method comprising: a step for forming an electrode multilayer body by stacking a negative electrode, a positive electrode and a solid electrolyte membrane; a step for exposing the electrode multilayer body to an environment having a dew point temperature of - 40°C and a moisture concentration of 127 ppm or less for 20 minutes or more; and a step for press molding the electrode multilayer body.