Tensioning Battery Pack Enclosure Resists Cell Expansion
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Solution Overview
Problem
Battery cells in electrified vehicles expand over time, exerting forces that can disrupt the structural integrity of their enclosures and affect performance, as existing solutions fail to adequately resist this expansion.
Innovation Solution
Incorporating a tensioning section within the battery pack enclosure, made of a stronger metallic material, that limits the relative movement between enclosure sides to resist the expansion of battery cells, using a combination of metallic and polymer materials to secure and restrict axial expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional enclosure without tensioning section is used, then the enclosure is simpler and lighter, but the structural integrity is compromised due to battery cell expansion
Solution Approach 1:
The tensioning side is segmented into a covering section and a tensioning section, allowing the enclosure to address expansion resistance without completely redesigning the entire structure. The tensioning section is a discrete component integrated into the enclosure wall.
Solution Approach 2:
The tensioning section is strategically positioned only where needed to resist battery cell expansion, rather than reinforcing the entire enclosure. This localized approach maintains structural integrity while minimizing added complexity.
2Strength
If a tensioning section made of strong metallic material is added, then the ability to resist expansion improves, but the weight and material cost increase
Solution Approach 1:
The strong metallic material is used only in the tensioning section where expansion resistance is needed, rather than throughout the entire enclosure. This localized reinforcement minimizes weight increase while maintaining necessary strength.
Solution Approach 2:
The enclosure combines different materials - a metallic tensioning section for strength and a polymer covering section for protection. This composite approach optimizes the weight-strength ratio by using each material where it is most effective.
3Strength
If the tensioning section is made entirely of metallic material, then expansion resistance is maximized, but material cost and manufacturing complexity increase
Solution Approach 1:
The enclosure combines a metallic tensioning section with a polymer covering section. The metallic section provides expansion resistance while the polymer section provides environmental protection and can be molded using standard automotive molding processes, simplifying manufacturing.
Solution Approach 2:
The tensioning section and covering section are merged into a single integrated component that can be manufactured as one piece or pre-assembled unit, reducing the number of separate parts and assembly steps required.
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 prevents structural damage and performance degradation by limiting the expansion of battery cells, ensuring the integrity and efficiency of the battery pack while reducing material costs and weight.
Implementation Method 1
a tensioning section that limits movement of a first enclosure side relative to a second enclosure side to resist expansion of at least one battery cell
Data Source
AI summary
An exemplary battery pack enclosure assembly includes a tensioning section that limits movement of a first enclosure side relative to a second enclosure side to resist expansion of at least one battery cell within a group of battery cells that are disposed along an axis between the first enclosure side and the second enclosure side.