Layered Insulation Sheet for Battery Cell Thermal Runaway Control
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Solution Overview
Problem
The challenge of heat transfer between adjacent secondary battery cells leads to thermal runaway and safety risks such as fire, particularly in high-capacity battery modules.
Innovation Solution
An insulation sheet with alternating layers of insulating materials and impact-resistant resin is used to reduce or prevent heat transfer between battery cells, enhancing thermal insulation and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If insulation sheet with alternating layers of insulating material and impact-resistant resin is used, then thermal insulation performance is improved, but device complexity increases
Solution Approach 1:
The insulation sheet is divided into multiple alternating layers of insulating material and impact-resistant resin. This segmentation allows each layer to perform its specific function (thermal insulation or mechanical protection) while collectively providing both thermal insulation performance and structural integrity, resolving the contradiction between improved insulation and increased complexity.
Solution Approach 2:
The insulation sheet uses a composite structure combining different materials (insulating material and impact-resistant resin) in alternating layers. This composite approach enables the sheet to simultaneously achieve thermal insulation properties from the insulating material and mechanical strength from the resin layers, addressing both thermal and structural requirements without excessive complexity.
2Temperature
If thicker insulation sheet is used to prevent heat transfer, then thermal insulation is improved, but mechanical strength may be compromised
Solution Approach 1:
The alternating layer structure combines insulating material with impact-resistant resin, creating a composite that maintains mechanical strength even when the overall sheet thickness increases for better thermal insulation. The resin layers provide structural reinforcement throughout the thickness, preventing strength compromise.
Solution Approach 2:
By segmenting the insulation sheet into alternating functional layers, the design distributes mechanical stress across multiple interfaces between layers. This segmentation prevents stress concentration that would occur in a single thick layer, maintaining mechanical strength while achieving the necessary thermal insulation through increased thickness.
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 insulation sheet effectively minimizes heat transfer and improves safety by preventing thermal runaway, while maintaining mechanical integrity and thermal conductivity.
Implementation Method 1
the one or more second layers include an insulating material and an impact-resistant resin
Data Source
AI summary
The present disclosure relates to an insulation sheet and a battery module including the insulation sheet. The insulation sheet includes one or more first layers, and one or more second layers alternately stacked with the one or more first layers, wherein the one or more second layers include an insulating material and an impact-resistant resin.