Battery Adhesive Body Resin Coating Warping Prevention

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Solution Overview

Problem

Conventional batteries face issues with displacement of the power generation element relative to the outer body, leading to reduced reliability due to volatile substances in adhesives and warping caused by adhesive contraction during encapsulation, which can damage the power generation element and disrupt electrical connections.

Innovation Solution

A battery design featuring a power generation element with a solid electrolyte layer between positive and negative electrode layers, an outer body, and an adhesive body that contacts both the power generation element and the outer body, eliminating volatile substances and adhesive-related warping, while providing a peel strength that allows for easy detachment and reusability of the adhesive body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an adhesive layer is used to reduce displacement of the power generation element, then the reliability is improved, but volatile substances in the adhesive cause warping and damage to the power generation element

Engineering Contradiction:

ImprovereliabilityVSAvoidwarping and damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent removes the adhesive layer from the battery structure and replaces it with a resin-coated protective film on the outer body. This extraction eliminates the source of volatile substances that cause warping and damage to the power generation element, while still providing the necessary bonding and protection functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a resin coating as an intermediary substance between the outer body and the power generation element. This resin layer serves as a mediator that provides bonding strength to prevent displacement while avoiding the harmful effects of adhesive volatile substances, thus resolving the contradiction between reliability and harmful factors.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the power generation element is enfolded by the outer body, then the protection is improved, but displacement of the power generation element relative to the outer body occurs

Engineering Contradiction:

ImproveprotectionVSAvoiddisplacement

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies a resin coating to the outer body surface before assembling the power generation element. This preliminary action creates a bonding interface that prevents displacement during subsequent handling and operation, while maintaining the protective enclosure function.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses a composite structure combining the outer body material with a resin coating layer. This composite approach provides both the mechanical protection of the outer body and the bonding properties of the resin, preventing displacement while maintaining protection.

Inventive Principle:

Principle #40Composite materials

3Strength

If an adhesive layer is used to bond the power generation element, then the bonding strength is improved, but the adhesive contraction damages the power generation element

Engineering Contradiction:

Improvebonding strengthVSAvoiddamage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the adhesive layer from the bonding system and replaces it with a resin-coated outer body. This eliminates the contraction problem associated with adhesive curing while maintaining bonding strength through the resin coating that is applied in a non-curing state.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The resin coating serves as a sacrificial or non-reusable bonding layer that provides sufficient bonding strength without the need for repositioning or adjustment, eliminating the contraction damage issue inherent in curing adhesives.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 configuration enhances the reliability of the battery by reducing displacement, protecting the power generation element from external impacts, and enabling easy detachment and reuse of the adhesive body, thereby improving the battery's performance and reducing production costs.

Implementation Method 1

an adhesive body located between and in contact with both a main surface of the power generation element and the outer body

Methodology Applied

Scientific EffectAdhesive: Adhesive

Data Source

PatentUS20230223585A1Battery and method of producing the same

Publication Date: 2023.07.13 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A battery includes a power generation element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between and in contact with both the positive electrode layer and the negative electrode layer, an outer body accommodating the power generation element, and an adhesive body located between and in contact with both a main surface of the power generation element and the outer body.