Multi-Layer Retention Barrier for Battery Cell Vent Management
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Solution Overview
Problem
Existing traction battery packs face challenges in effectively retaining battery cells, managing thermal energy during battery thermal events, and controlling the flow of battery vent byproducts.
Innovation Solution
The implementation of a retention barrier assembly within the traction battery pack, comprising a foam portion, an insulation portion, a backer plate, and adhesive layers, which serves to retain battery cells, shield the enclosure from thermal energy, and manage vent byproducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a retention barrier assembly is implemented to retain battery cells, then structural integrity is enhanced, but device complexity increases
Solution Approach 1:
The retention barrier assembly is divided into multiple functional layers: a foam portion for retention, an insulation portion for thermal management, and a backer plate for structural support. Each layer performs a specific function, allowing the system to achieve high structural integrity while maintaining manageable complexity through functional segmentation.
Solution Approach 2:
The assembly combines different materials (foam, insulation material, backer plate) into a composite structure that leverages the strengths of each material type. The foam provides retention properties, the insulation portion manages thermal energy, and the backer plate provides structural rigidity, together resolving the contradiction between strength and complexity.
2Object-affected harmful factors
If an insulation portion is added to shield from thermal energy, then protection from thermal energy is improved, but device complexity increases
Solution Approach 1:
The insulation function is merged with the retention barrier assembly structure. The insulation portion is integrated between the foam portion and the backer plate, combining thermal protection with the existing retention structure rather than adding a separate insulation system, thus improving protection while minimizing complexity increase.
Solution Approach 2:
The multi-layer assembly serves multiple functions simultaneously: the foam portion retains battery cells, the insulation portion shields from thermal energy, and the backer plate provides structural support. This multi-functionality resolves the contradiction by achieving thermal protection without requiring a separate dedicated insulation system.
3Reliability
If a multi-layer retention barrier assembly is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The retention barrier assembly is segmented into distinct functional layers (foam portion, insulation portion, backer plate), where each layer performs a specific function. This segmentation improves reliability by ensuring that each function is performed by a specialized component, while the modular nature keeps complexity manageable through clear functional separation.
Solution Approach 2:
The composite structure combines materials with different properties (retention foam, insulating material, structural backer plate) to achieve reliable performance across multiple functions simultaneously. The composite approach resolves the reliability-complexity contradiction by integrating multiple functions into a unified multi-material system rather than separate 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 retention barrier assembly enhances the structural integrity of the battery pack, effectively retains battery cells, shields the enclosure from thermal energy, and manages vent byproducts during battery thermal events, thereby improving the overall safety and performance of the traction battery pack.
Implementation Method 1
The retention barrier assembly includes a first adhesive layer between the foam portion and the insulation portion, and a second adhesive layer between the backer plate and the insulation portion
Data Source
AI summary
Retention barrier assemblies are provided for traction battery packs. The retention barrier assemblies may be multi-layered and multi-functional sandwich structures that include foam, insulation, a backer plate, and adhesive. The retention barrier assemblies serve numerous functions including but not limited to retaining/holding down battery cells within a cell stack, shielding portions of an enclosure assembly from thermal energy created when one or more battery cells release battery vent gases and/or other effluents during a battery thermal event, and controlling the flow of battery vent byproducts in the event of such a battery thermal event as part of a vent management strategy.