Battery Pack Potting Structure for Impact Load Sharing
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Solution Overview
Problem
Existing battery pack systems in electric vehicles have unutilized space between the pack housing, module housing, and battery cells, which compromises the effective protection and structural integrity of the battery cells.
Innovation Solution
A battery pack design incorporating an enclosure with stuffers and potting material that encapsulates the battery cell assembly, utilizing the unutilized space to enhance protection and structural integrity by sharing a load path with the enclosure and battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If space is left between the pack housing, module housing, and battery cells, then the battery cells are protected from damage, but the structural integrity and load-bearing capability are reduced
Solution Approach 1:
The patent combines the protective function and structural load-bearing function into a single integrated system. The potting material fills the gaps between battery cells and housing, merging the previously separate protective space with the structural framework. The stuffers are integrated into the potting material, creating a unified load-path system that simultaneously protects cells and maintains structural integrity.
Solution Approach 2:
The patent uses composite material systems including the potting material (which may be a polymer or elastomer), stuffers (which may be foam or rigid material), and the housing structure. These composite materials work together to provide both cushioning protection and structural strength, resolving the contradiction between soft protection and hard structural integrity.
2Reliability
If space is utilized for protection, then the battery cells are safeguarded, but the unutilized space reduces the effective use of the battery pack volume
Solution Approach 1:
The potting material serves multiple functions simultaneously: it protects battery cells from mechanical damage, provides thermal management pathways, fills unused volume to create a compact structure, and contributes to the overall structural integrity. This multi-functionality allows the system to protect cells while effectively utilizing the available volume.
Solution Approach 2:
The patent changes the physical state and properties of the protective material from discrete air gaps to a continuous potting material with controlled density and elasticity. This parameter change allows the material to provide protection while compactly filling the available volume, eliminating wasted space while maintaining protective functionality.
3Strength
If stuffers and potting are added to utilize space, then structural integrity is enhanced, but the device complexity increases
Solution Approach 1:
The stuffers are pre-positioned in the housing before the battery cells are installed, and the potting material is applied in a single step that encapsulates both the cells and stuffers. This preliminary action and one-step potting process reduces assembly complexity compared to multiple separate installation steps, despite adding structural 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 design provides enhanced protection and structural integrity during impact events by distributing load and absorbing energy, ensuring the battery cells are effectively safeguarded.
Implementation Method 1
The design provides enhanced protection and structural integrity during impact events by distributing load and absorbing energy
Implementation Method 2
The potting and the one or more stuffers share at least one load path between the enclosure and the battery cell assembly
Data Source
AI summary
A battery pack, comprising an enclosure having an inner wall and an outer wall opposite the inner wall, a battery cell assembly arranged in the enclosure and including one or more battery cells, one or more stuffers arranged between the inner wall and the battery cell assembly, and a potting arranged in the enclosure and at least partially encapsulating the battery cell assembly and the one or more stuffers.