Solid State Battery Moisture Absorbing Film Integration

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Solution Overview

Problem

Conventional solid state batteries face challenges in preventing moisture ingress, which can deteriorate battery characteristics and are not effectively sealed, especially when mounted on substrates like printed wiring boards.

Innovation Solution

A packaged solid state battery design that integrates a moisture-absorbing film with the battery laminate, eliminating gaps and effectively absorbing moisture, thereby reducing moisture entry and allowing for downsized packaging without compromising energy density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional secondary battery with liquid electrolyte is used, then ion transfer for charge and discharge is achieved, but safety is compromised due to leakage and flammability risks

Engineering Contradiction:

ImprovesafetyVSAvoidleakage and flammability

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the physical state of the electrolyte from liquid to solid, replacing the liquid electrolyte with a solid electrolyte. This fundamental parameter change eliminates the harmful effects of leakage and flammability associated with liquid electrolytes while maintaining the essential function of ion transfer for battery operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the liquid-based electrolytic system with a solid electrolyte system, substituting the mechanical/fluid properties of liquid electrolyte with solid material properties. This substitution fundamentally changes how the electrolyte functions while eliminating safety hazards associated with liquid handling and storage

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If moisture absorbent is added inside the housing, then some moisture absorption occurs, but moisture can still enter from gaps between the moisture absorbent and the battery

Engineering Contradiction:

Improvemoisture entryVSAvoidmoisture protection

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent merges the moisture absorbent with the sealing structure by integrating it into the sealing resin layer. This combination ensures that the moisture absorbent is not merely placed inside the housing but is structurally incorporated into the sealing system, eliminating gaps and ensuring continuous moisture protection

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a composite sealing structure by combining the sealing resin with the moisture absorbent in a single integrated layer. This composite material approach allows the sealing layer to simultaneously provide both sealing functionality and moisture absorption capability, eliminating the need for separate components and potential gaps between them

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If the battery is packaged to be mounted on substrates, then adaptability for electronic devices is improved, but moisture protection becomes more challenging due to mounting gaps and exposure

Engineering Contradiction:

Improvemounting capabilityVSAvoidmoisture exposure

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent makes the sealing resin layer multi-functional by incorporating moisture absorbent into it. This single layer now performs both sealing (providing mechanical protection and moisture barrier) and moisture absorption functions. This universal approach ensures that even when the battery is mounted on substrates with potential exposure, the integrated sealing and moisture management continues to protect the battery

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent takes preliminary action by pre-integrating the moisture absorbent into the sealing structure before mounting. This ensures that moisture protection is already in place and actively functioning before the battery is installed on the substrate, preventing moisture ingress through mounting gaps or exposure areas

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

The solution effectively prevents moisture ingress, maintaining battery performance and enabling compact, reliable solid state battery packaging suitable for substrate mounting.

Implementation Method 1

a moisture absorbing film contacting at least a part of the solid state battery laminate and integrated with the solid state battery laminate

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS20230163365A1Solid state battery

Publication Date: 2023.05.25 MURATA MFG CO LTD

AI summary

A solid state battery that includes: a solid state battery laminate having a stacked portion that includes a positive electrode layer, a negative electrode layer, and a solid electrolyte interposed between the positive electrode layer and the negative electrode layer; and a moisture absorbing film contacting at least a part of the solid state battery laminate and integrated with the solid state battery laminate.