Sealed Battery Fuse Module With Energy-Dissipating Arc Cap

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Solution Overview

Problem

Existing battery fuse modules can experience electrical arcing and explosions during overcurrent conditions, which may ignite volatile gases in the environment, posing a risk of damage or injury.

Innovation Solution

A sealed battery fuse module with a resilient housing and energy-dissipating cap that contains any arcing and explosion within the module, using a conductive ring and cap portion to absorb and dissipate energy, preventing ignition of surrounding gases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a battery fuse module is used to protect against overcurrent conditions, then electrical damage to the battery and load is prevented, but electrical arcing and explosions may occur during overcurrent conditions that can ignite volatile gases in the environment

Engineering Contradiction:
Improveovercurrent protectionVSAvoidelectrical arcing and explosion risk
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the 'Blessing in disguise' principle by designing a cap with energy-dissipating features that convert the harmful electrical arc energy into beneficial controlled energy release through defined pathways. The cap includes features such as vent holes, rib structures, and material selections that guide the arc energy through controlled paths, transforming the potentially explosive arc into a managed energy dissipation process that prevents uncontrolled explosions while maintaining the protective function of the fuse module.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies the 'Intermediary' principle by introducing a specially designed cap as an intermediary element between the fusible element and the external environment. This cap acts as a mediator that intercepts and manages the electrical arc before it can escape into the surrounding environment. The cap's energy-dissipating features serve as an intermediate mechanism that handles the arc energy, preventing direct interaction between the harmful arc and volatile gases in the environment.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If the fusible element is allowed to open during overcurrent condition, then current flow is arrested, but rapid heating of surrounding air and particulate may cause a small explosion

Engineering Contradiction:
Improvecurrent interruptionVSAvoidexplosion energy
Core Design Contradiction:
ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies this principle by transforming the harmful explosion energy into a controlled energy dissipation process. The cap's design features, including vent holes and energy-dissipating structures, convert the uncontrolled explosive energy release into a managed process that safely channels and dissipates the energy through predefined pathways, preventing uncontrolled explosions while maintaining effective current interruption.

Inventive Principle:
Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent applies this principle by incorporating energy-dissipating features in the cap design that are prepared in advance to absorb and manage the explosion energy before it can cause harm. The cap's structural features, such as reinforced walls, vent holes, and material selections, are pre-configured to cushion and manage the energy release, providing a buffer between the fusible element's opening and the external environment.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

3Object-affected harmful factors

If a sealed housing is used to contain the fusible element, then electrical arcing is contained, but the housing may rupture under the pressure and energy of an explosion

Engineering Contradiction:
Improvearc containmentVSAvoidhousing rupture resistance
Core Design Contradiction:
Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent applies the 'Segmentation' principle by dividing the housing into functional segments: a sealed portion for arc containment and a cap portion with energy-dissipating features for pressure management. The cap is designed as a separate element that can be optimally configured for energy dissipation, while the main housing maintains its sealed structure for arc containment. This segmentation allows each part to be optimized for its specific function without compromising the other.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies this principle by changing the physical parameters of the cap portion to optimize energy dissipation. The cap's material properties, thickness, vent hole size and distribution, and structural geometry are specifically designed to manage pressure and energy release. These parameter changes enable the cap to withstand and dissipate explosion energies without causing the entire housing to rupture, while maintaining the sealed structure's arc containment capability.

Inventive Principle:
Principle #35Parameter changes

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 contains electrical arcing and explosions, ensuring safe operation in hazardous environments by preventing the ignition of volatile gases and mitigating the risk of module rupture.

Implementation Method 1

Upon the occurrence of an overcurrent condition, a fusible element within the battery fuse module melts, disintegrates, or otherwise opens to arrest the flow of current

Methodology Applied
Scientific EffectMelting: Melting

Implementation Method 2

the electrical arc may rapidly heat surrounding air and ambient particulate and may cause a small explosion

Methodology Applied
Scientific EffectJoule heating: Joule Heating

Implementation Method 3

a cover adapted to dissipate energy from a blown fusible element

Methodology Applied
Scientific EffectEnergy dissipation:

Data Source

PatentEP3671801B1Sealed battery fuse module with energy dissipating cap
Publication Date: 2025.01.08 LITTELFUSE INC
  • EP3671801B1 patent drawingFigure 1
  • EP3671801B1 patent drawingFigure 2~3
  • EP3671801B1 patent drawingFigure 4

AI summary

A fuse module including a mounting block having a through-hole extending therethrough, a fuse including an upper portion disposed on a top of the mounting block and having a through-hole, a lower portion disposed on a bottom of the mounting block and having a through-hole, and a fusible element disposed adjacent a sidewall of the mounting block and connecting the upper portion to the lower portion, the fuse module further including a housing having a main body portion encasing the mounting block and the fuse, the main body portion having apertures in top and bottom surfaces thereof aligned with the through-hole of the mounting block, and a cap portion connected to the main body portion and disposed over the fusible element, the cap portion having surface features extending from an interior surface thereof for absorbing energy upon occurrence of an overcurrent condition in the fuse.