BESS Vent Covering Control for Thermal Runaway Gas Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery energy storage systems (BESS) face challenges in mitigating dangerous conditions such as thermal runaway, which can lead to fires and the release of toxic gases.
Innovation Solution
The implementation of an energy storage system with a ventilation system that includes an enclosure with a vent and a vent covering that can be electronically controlled to open or close, allowing for active or passive ventilation modes to manage gas concentrations and prevent explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sealed enclosure is used to contain battery cells, then safety against external contaminants is improved, but gas accumulation during thermal runaway increases fire hazard
Solution Approach 1:
The enclosure is segmented into multiple zones with selective venting capabilities. Vents are strategically positioned at different locations (top, bottom, sides) to segment the gas flow paths, allowing controlled release of flammable gases while maintaining overall enclosure integrity and protection from external contaminants.
Solution Approach 2:
A ventilation system acts as an intermediary between the sealed enclosure and the external environment. This intermediary system includes controllable vents and exhaust mechanisms that mediate gas release, allowing the enclosure to remain largely sealed for contaminant protection while providing controlled pathways for flammable gas discharge.
2Object-generated harmful factors
If vents are kept open to allow gas escape, then fire hazard is reduced, but energy loss and environmental pollution increase
Solution Approach 1:
The ventilation system transitions from static open vents to dynamic controllable vents. The vents can dynamically adjust their opening degree or closure state based on real-time gas concentration measurements, allowing the system to open vents only when and where flammable gases are detected, thereby minimizing unnecessary energy loss while maintaining fire safety.
Solution Approach 2:
The system changes the operational parameters of the vents based on detected gas concentrations. When flammable gas levels exceed thresholds, vent opening degree and exhaust flow rate are increased; when levels are safe, vents are closed or minimized, optimizing the balance between fire hazard reduction and energy conservation.
3Reliability
If active ventilation is used to control gas concentrations, then fire safety is improved, but system complexity and power consumption increase
Solution Approach 1:
The ventilation system is designed to be self-regulating through automatic sensing and control. Gas concentration sensors continuously monitor the enclosure interior, and the control system automatically activates vents and adjusts exhaust flow without human intervention, reducing the need for complex manual control mechanisms while maintaining high fire safety reliability.
Solution Approach 2:
The system incorporates feedback loops where gas concentration measurements continuously inform ventilation control decisions. The control system receives real-time data from sensors and adjusts vent opening degree and exhaust fan speed accordingly, creating a closed-loop control system that maintains fire safety while minimizing unnecessary energy consumption and system complexity.
4Measurement precision
If multiple sensors are deployed to detect flammable gases, then detection accuracy is improved, but false alarms and system cost increase
Solution Approach 1:
Multiple sensor types (flame detectors, gas concentration sensors, temperature sensors) are merged into an integrated detection system. The system combines readings from different sensor modalities and uses logical evaluation to distinguish true fire hazards from false alarm conditions, improving detection accuracy while reducing false alarms through cross-validation of multiple measurement channels.
Solution Approach 2:
The detection system uses a composite approach combining multiple sensing technologies rather than relying on a single sensor type. This composite sensing strategy integrates flame detection, gas concentration measurement, and temperature monitoring to create a more reliable and accurate detection system that reduces false alarms while maintaining high precision.
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 solution effectively maintains gas concentrations below the safe lower flammability limit, reducing the risk of fires and explosions within the BESS enclosure, while also allowing for controlled ventilation to dissipate fires.
Implementation Method 1
the first vent covering is made of a thermally decomposable material
Data Source
AI summary
An energy storage system includes an enclosure having a vent forming a flow path between an interior volume of the enclosure and an environment exterior to the enclosure. A vent covering is mounted proximate the vent and is selectively disposable over the vent such that the flow path is open when the vent covering is in an open position and closed when the vent covering is in a closed position. The vent covering can be biased to the open position and/or made of a thermally decomposable material. An actuator is coupled to the vent covering such that supply of power to the actuator causes the vent covering to assume the closed position and loss of power to the actuator causes the vent covering to assume the open position. A method comprises detecting a flammable gas and opening a first flow path by a first vent of the enclosure.