Pouch Cell Flame-Retardant Coating for Fire Suppression
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Solution Overview
Problem
Electrochemical cells are prone to ignition due to exothermic reactions during cycling and processing, which can lead to chain reactions and fires, especially when in close proximity or exposed to external heat sources.
Innovation Solution
Incorporating a flame retardant mechanism with gas suppression precursors like urea-formaldehyde resins and semi-solid electrodes that release a flame-smothering gas or foam above a threshold temperature to prevent or extinguish fires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrochemical cells are placed in close proximity to increase productivity, then productivity is improved, but the risk of chain reaction fires increases due to heat propagation
Solution Approach 1:
The patent divides the battery system into modular units with individual flame retardant barriers between each cell or module. This segmentation prevents fire propagation from one unit to another, allowing higher density packing while maintaining safety. The flame retardant material creates firebreaks that isolate thermal events to individual cells.
Solution Approach 2:
The patent introduces flame retardant materials as intermediary substances between electrochemical cells. These materials act as thermal and chemical barriers that intercept heat transfer and prevent ignition propagation. The intermediaries include intumescent coatings, gel electrolytes, or fire-resistant separators that physically and chemically intervene in the fire propagation pathway.
2Ease of manufacture
If welding or brazing is used to join electrochemical cells during processing, then ease of manufacture is improved, but ignition events can occur from sparks
Solution Approach 1:
The patent applies flame retardant coatings or encasements to electrochemical cells before welding or brazing operations. This preliminary protective action ensures that if sparks are generated during joining processes, the flame retardant material is already in place to prevent ignition of the cell contents or surrounding materials.
Solution Approach 2:
The patent incorporates flame retardant materials that provide beforehand cushioning against potential ignition from welding sparks. These materials are pre-positioned around vulnerable areas such as cell tabs, connectors, and electrolyte reservoirs, creating a safety buffer that absorbs or suppresses ignition attempts before they can propagate.
3Reliability
If flame retardant materials are added to electrochemical cells, then fire safety is improved, but device complexity increases
Solution Approach 1:
The patent merges flame retardant functions with existing structural components of the electrochemical cell. Instead of adding separate flame retardant systems, the fire suppression capability is integrated into the cell housing, separator, or electrolyte composition itself. This merging approach provides fire safety without proportionally increasing device complexity.
Solution Approach 2:
The patent employs flame retardant materials that serve multiple functions within the electrochemical cell system. For example, the electrolyte serves both as ion conductor and fire suppressant, or the separator provides both electrical isolation and thermal barrier functions. This multi-functionality reduces the need for additional dedicated fire safety components.
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 flame retardant mechanism effectively prevents or extinguishes fires by smothering flames, enhancing safety and reducing the risk of ignition events in electrochemical cells.
Implementation Method 1
the flame retardant material can include a gas suppression precursor that produces a flame suppressing gas above a threshold temperature
Implementation Method 2
the flame retardant mechanism effectively prevents or extinguishes fires by smothering flames
Data Source
AI summary
Apparatus, systems, and methods described herein relate to the manufacture and use of electrochemical cells with a flame retardant mechanism. In some embodiments, an electrochemical cell includes a first current collector coupled to a first portion of a first pouch, the first current collector having a first electrode material disposed thereon. The electrochemical cell further includes a second current collector coupled to a second portion of the first pouch, the second current collector having a second electrode material disposed thereon. The electrochemical cell further includes a separator disposed between the first electrode material and the second electrode material, the first portion of the first pouch coupled to the second portion of the first pouch to enclose the electrochemical cell. The electrochemical cell further includes a flame retardant material coated to the first pouch and a second pouch, the second pouch enclosing the first pouch and the flame retardant material.