Flexible Battery Sealing Structure for Internal Short-Circuit Suppression

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Solution Overview

Problem

Secondary batteries have not yet achieved sufficient suppression of internal short circuits caused by external loads, indicating a need for improved design configurations to prevent such occurrences.

Innovation Solution

A secondary battery design that includes an outer package member with flexibility, a battery device, a wiring member extending from the inside to the outside of the package, and a sealing member with insulating properties. The sealing member is interposed between the battery device and the wiring member, extending along the wiring member and sealing the opening of the outer package member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wiring member extends directly from inside to outside the outer package member without additional sealing, then the device complexity is reduced, but internal short circuits occur due to insufficient insulation between the wiring member and battery device

Engineering Contradiction:

Improvesuppression of internal short circuitVSAvoidstructure of sealing member

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing member acts as an intermediary insulating component positioned between the wiring member and the battery device. This mediator prevents direct contact between conductive elements, eliminating the internal short circuit pathway while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sealing member is configured as a flexible thin film that extends along the wiring member from the inside to the outside of the outer package member. This flexible film structure provides effective insulation without adding significant structural complexity, conforming to the wiring member's position and movement.

Inventive Principle:

Principle #30Flexible shells and thin films

2Reliability

If the sealing member is made rigid to maintain insulation, then electrical insulation is improved, but the sealing member cannot accommodate positional changes under external loads

Engineering Contradiction:

Improveelectrical insulationVSAvoidresistance to positional deviation under external load

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The sealing member is designed as a flexible film that can bend and deform under external loads while maintaining its electrical insulating function. This flexibility allows the sealing member to adapt to positional changes of the wiring member without compromising insulation or requiring rigid structural support.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The sealing member's physical parameters (flexibility, elasticity) are optimized to allow controlled deformation under external loads while maintaining sufficient electrical insulation. The material properties are selected to balance rigidity for insulation with flexibility for adapting to positional changes.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the sealing member extends only at the opening, then the structure is simplified, but insulation between the wiring member and battery device along the entire path is insufficient

Engineering Contradiction:

Improveelectrical insulation along wiring memberVSAvoidextent of sealing member

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing member extends along the entire length of the wiring member from the inside to the outside of the outer package member, acting as a continuous insulating barrier. This comprehensive coverage ensures insulation at all potential contact points between the wiring member and battery device, not just at the opening.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The sealing member is implemented as a flexible insulating film that conforms to the wiring member's path through the battery device. This film structure provides continuous insulation along the entire wiring member length while maintaining flexibility and avoiding excessive structural complexity.

Inventive Principle:

Principle #30Flexible shells and thin films

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 design effectively suppresses internal short circuits caused by external loads, ensuring stable charging and discharging operations by maintaining electrical insulation and preventing positional deviation of the sealing member under external loads.

Implementation Method 1

The sealing member having an insulating property and sealing the opening of the outer package member extends along the wiring member and is interposed between the battery device and the wiring member

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Data Source

PatentUS12266808B2Secondary battery

Publication Date: 2025.04.01 MURATA MFG CO LTD

AI summary

A secondary battery includes an outer package member, a battery device, a wiring member, and a sealing member. The outer package member has flexibility and has an opening. The battery device is accommodated inside the outer package member. The wiring member extends from an inside of the outer package member to an outside of the outer package member via the opening. The wiring member is coupled to the battery device. The sealing member has an insulating property. The sealing member extends along the wiring member from the inside of the outer package member at least to the opening, and is interposed between the battery device and the wiring member. The sealing member is configured to seal the opening.