All-Solid-State Battery Outer Package With Buffer Layer for Uniform Pressure

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Solution Overview

Problem

Existing all-solid-state batteries face challenges in achieving uniform pressure distribution during high-pressure constraining due to non-uniform application of pressure from the exterior material, particularly affecting the delamination between the solid electrolyte and active material layers.

Innovation Solution

Incorporating a laminate structure with a buffer layer outside the heat-sealable resin layer in the exterior material, which acts as a pressure buffer to ensure uniform pressing on the battery surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high-pressure pressing is applied from the outside of a film-shaped exterior material, then the all-solid-state battery can be constrained to suppress delamination, but the pressure distribution becomes non-uniform with higher pressure at the outer peripheral portion than the central portion

Engineering Contradiction:

Improvesuppression of delaminationVSAvoiduniformity of pressure distribution

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

A buffer layer is introduced as an intermediary between the exterior material and the all-solid-state battery. This buffer layer mediates the pressure transmission, converting the non-uniform pressure distribution from the exterior material into a uniform pressure distribution on the battery surface, thereby maintaining delamination suppression while achieving uniform pressure application

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If metallic exterior materials are used for all-solid-state batteries, then high strength and safety are achieved, but weight reduction and shape diversification are limited

Engineering Contradiction:

Improveexterior material strengthVSAvoidbattery weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The exterior material undergoes parameter changes by transitioning from metallic materials to film-shaped materials with base material and heat-sealable resin layers. This change in material parameters enables significant weight reduction while the added buffer layer compensates for strength requirements, and the film structure enables diverse battery shapes

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If film-shaped exterior material is used to achieve weight reduction and shape diversification, then processing flexibility is improved, but the ability to apply uniform high pressure for delamination suppression deteriorates

Engineering Contradiction:

Improveshape diversificationVSAvoiduniformity of pressure application

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The buffer layer serves as a mediator that decouples the shape adaptability function of the film-shaped exterior material from the pressure uniformity function. The exterior material provides shape flexibility while the buffer layer ensures uniform pressure distribution, allowing both requirements to be satisfied simultaneously

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12438217B2Outer package material for all-solid-state batteries, method for producing same and all-solid-state battery

Publication Date: 2025.10.07 DAI NIPPON PRINTING CO LTD

AI summary

An outer package material for all-solid-state batteries, which is composed of a multilayer body that is sequentially provided, from the outer side, with at least a base material layer, a barrier layer and a thermally fusible resin layer in this order, and which is configured such that the multilayer body has a layer that has a buffering function on the outer side of the thermally fusible resin layer.