Battery Charging Enclosure Fire Containment and Airflow Control
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Solution Overview
Problem
Lithium-ion polymer batteries are prone to catastrophic failures due to events like overcharge, over-discharge, overheating, short circuits, and physical stress, which can lead to pouch rupture, electrolyte leakage, and fires, necessitating a solution to mitigate these risks during charging.
Innovation Solution
A battery charging enclosure with integrated safety features, including a fire protective insulation layer, airflow control through fan assemblies, smoke and fire detection, lid sensors, and a circuitry system that disables power to the charging port and fans upon detecting smoke, fire, or orientation changes, to contain and prevent catastrophic events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lithium-ion polymer batteries are used to provide higher specific energy and lighter weight, then weight reduction and energy density are improved, but the risk of catastrophic failures including pouch rupture, electrolyte leakage, and fire increases
Solution Approach 1:
The enclosure is divided into a fire containment chamber and a separate safe zone, with the battery compartment isolated from the external environment. This segmentation contains potential catastrophic events within a defined space, preventing harm to users while maintaining the lightweight battery design.
Solution Approach 2:
Fire-resistant materials and thermal barriers are introduced as intermediary layers between the battery and the external environment. These intermediaries absorb and redirect thermal energy, preventing direct transmission of heat and fire hazards while allowing the lightweight battery to function.
2Temperature
If airflow is provided for cooling during charging, then temperature control is improved, but the risk of smoke and fire spread increases
Solution Approach 1:
Different regions of the enclosure have different airflow characteristics. The fire containment chamber has restricted airflow to prevent smoke spread, while the battery compartment has controlled ventilation for cooling. This localized quality control allows temperature management without propagating harmful factors.
Solution Approach 2:
Fire-resistant barriers and smoke-blocking materials are positioned as intermediaries between the battery compartment and the external environment. These intermediaries allow controlled cooling airflow while blocking the propagation of smoke and fire, resolving the contradiction between temperature control and harm prevention.
3Reliability
If continuous monitoring and control systems are implemented to detect smoke, fire, and orientation changes, then safety detection capability is improved, but device complexity increases
Solution Approach 1:
The system uses the battery enclosure's own structural features and environmental cues for monitoring. Orientation sensors detect changes in the enclosure's position, and fire-resistant materials provide passive safety without requiring active intervention. This self-service approach improves reliability while minimizing added complexity.
Solution Approach 2:
Complex electronic control systems are replaced with simpler mechanical and passive safety features where possible. For example, mechanical latches and fire-resistant material barriers provide automatic protection without requiring complex electronic control, reducing device complexity while maintaining reliability.
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 enclosure effectively contains and prevents the spread of smoke and fire, reducing the risk of battery damage and ensuring safer charging by disabling airflow and power supply in case of hazardous conditions, thereby enhancing the safety and reliability of lithium-ion polymer battery charging.
Implementation Method 1
an insulation layer covering a surface of each of the receptacle portion and the lid portion
Implementation Method 2
a first fan assembly disposed at a first side of the enclosure and configured to communicate air-flow from an external environment into an internal volume of the enclosure; a second fan assembly disposed at a second side of the enclosure and configured to communicate the air-flow from within the internal volume of the enclosure to the external environment
Data Source
AI summary
The disclosure concerns a battery charging enclosure which includes an outer shell and lid portion each covered by a fire protective insulation layer forming an internal volume of the enclosure, wherein a battery is housed within the internal volume, and various safety features for preventing catastrophic charging-related events are implemented. Certain safety features include, disabling air-flow through the internal volume upon detection of smoke, fire, lid-opening event, or a change of orientation of the enclosure. Other features and aspects concerning the battery charging enclosure are further described herein.