Battery Pack Enclosure Failure Port for Thermal Runaway Exhaust
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Solution Overview
Problem
Current battery packs in electric vehicles face challenges with thermal runaway events, where a single cell's increased heat generation can lead to a cascading effect, causing extensive damage and safety risks due to uncontrolled thermal energy and hot gas release.
Innovation Solution
A battery pack thermal management system with an enclosure failure port that opens during a thermal runaway event to exhaust hot gas and thermal energy, using materials with high melting points and intumescent layers, along with heat-resistant channels and thermal insulation to direct the flow away from the passenger compartment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack enclosure is made completely sealed to prevent thermal runaway propagation, then thermal energy containment is improved, but pressure buildup during thermal runaway causes catastrophic failure
Solution Approach 1:
The enclosure is designed with non-uniform properties: most of the enclosure is sealed and heat-resistant to contain thermal runaway, while specific localized regions (failure ports) are designed with lower melting point materials to open under pressure. This allows the majority of the structure to maintain integrity while specific areas provide controlled release pathways.
Solution Approach 2:
A controlled failure port acts as an intermediary element between the sealed enclosure and the external environment. It provides a predetermined weak point that opens under pressure to release hot gases and thermal energy, preventing catastrophic failure of the entire enclosure while maintaining containment during normal operation.
2Strength
If the enclosure wall is made thick and strong to withstand thermal runaway pressure, then structural integrity is improved, but the enclosure cannot release thermal energy effectively
Solution Approach 1:
The enclosure employs varying wall thicknesses and material properties: thick, heat-resistant walls in most areas provide structural integrity and thermal containment, while thin-walled failure port regions are designed to open at specific pressure thresholds, enabling controlled thermal energy release without compromising overall structural strength.
Solution Approach 2:
The enclosure uses composite construction with different materials having different thermal and mechanical properties. The main enclosure body uses high-strength, heat-resistant materials, while the failure port regions use materials with lower melting points that open under pressure, creating a composite structure that simultaneously achieves strength and controlled energy release.
3Object-affected harmful factors
If thermal insulation is added to protect the passenger compartment, then passenger safety is improved, but thermal energy accumulates within the battery pack enclosure
Solution Approach 1:
The controlled failure port serves as an intermediary pressure relief mechanism that opens when internal temperature and pressure exceed safe thresholds. This prevents uncontrolled thermal runaway propagation to the passenger compartment while allowing safe release of excess thermal energy, balancing insulation protection with pressure management.
Solution Approach 2:
The enclosure design incorporates passive feedback through the failure port mechanism: when internal temperature and pressure rise during thermal runaway, the increased pressure automatically opens the failure port, allowing thermal energy release. This self-regulating system protects the passenger compartment without requiring active monitoring or control systems.
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
Effectively manages thermal runaway events by containing and directing hot gas and thermal energy, reducing the risk of passenger injury and collateral damage by ensuring safe exhaust of thermal energy and preventing further cell activation.
Implementation Method 1
thermal runaway occurring when the internal reaction rate increases to the point that more heat is being generated than can be withdrawn
Implementation Method 2
the temperature of adjacent cells within the battery pack will also increase
Implementation Method 3
an inner intumescent layer, for example where the inner intumescent layer prevents the outer layer from melting during the battery pack thermal runaway event
Implementation Method 4
at least one layer of a thermal insulator positioned between the battery pack enclosure and a vehicle passenger compartment
Data Source
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AI summary
A battery pack thermal management system is provided that is comprised of at least one enclosure failure port integrated into at least one wall of a battery pack enclosure, where the enclosure failure port(s) remains closed during normal operation of the battery pack, and opens during a battery pack thermal runaway event, thereby providing a flow path for hot gas generated during the thermal runaway event to be exhausted out of the battery pack enclosure in a controlled fashion.