Battery Pack Heat Suppression Sheet With 60°C Venting Gap
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Solution Overview
Problem
Existing battery packs face challenges in maintaining surface temperature during normal use and effectively cooling battery cells during abnormal high-temperature situations, as existing heat transfer suppression methods either fail to cool adequately during normal operation or inadequately manage heat propagation between cells.
Innovation Solution
A heat transfer suppression sheet is interposed between battery cells, comprising a heat-insulating material with inorganic particles or fibers and a covering material, featuring a sealed gap that opens at 60°C or more to release heat, allowing moisture evaporation for cooling during normal use and steam release during abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If only a heat-insulating layer is provided between battery cells, then heat propagation between cells is suppressed, but the battery cell cannot be effectively cooled during charge and discharge cycles
Solution Approach 1:
The heat transfer suppression sheet is segmented into multiple functional layers: a heat-insulating material layer containing inorganic particles or fibers for heat blocking, and a covering material layer that forms sealed gaps. This segmentation allows each layer to perform its specific function - the heat-insulating layer suppresses heat propagation while the covering material with sealed gaps enables cooling through evaporation during normal use.
Solution Approach 2:
The invention uses composite materials combining organic and inorganic components. The heat-insulating material contains inorganic particles or fibers embedded in a matrix, creating a composite structure that provides both thermal insulation properties and structural integrity. This composite approach enables the sheet to simultaneously achieve heat suppression and cooling functions.
2Temperature
If a heat-absorbing sheet with dehydration substances is used, then cooling during normal use is achieved, but the complexity of material composition increases
Solution Approach 1:
The heat-insulating material contains inorganic particles or fibers that inherently possess heat absorption and cooling properties through their material characteristics. The covering material with sealed gaps enables passive cooling through evaporation without requiring complex dehydration mechanisms. This self-service approach allows the system to cool itself during normal use and release heat during abnormalities through the phase change and evaporation processes of the materials already present.
3Object-affected harmful factors
If the covering material is designed to form communication openings at 60°C or more, then heat release during abnormalities is enabled, but the control precision of heat management is reduced
Solution Approach 1:
The covering material is designed with a specific melting or softening temperature point (60°C or more). When the temperature reaches this parameter threshold during abnormal conditions, the material undergoes a phase change or structural transformation, automatically forming communication openings. This parameter-based control mechanism simplifies the design by using inherent material properties rather than complex control systems, while still achieving effective heat release during abnormalities.
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 solution effectively cools battery cells during normal operation and prevents heat propagation between cells during abnormalities, thereby preventing thermal runaway.
Implementation Method 1
a heat-insulating material containing at least one of inorganic particles or inorganic fibers
Implementation Method 2
the covering material is configured such that a communication opening that allows the gap to communicate with the outside of the covering material is formed at a temperature of 60° C. or more
Implementation Method 3
Heat transfer from one plate member to another plate member is also suppressed by the low thermal conductive layer
Data Source
AI summary
A heat transfer suppression sheet for a battery pack, the heat transfer suppression sheet being used in a battery pack in which battery cells are connected in series or in parallel and being interposed between the battery cells, the heat transfer suppression sheet containing: a heat-insulating material containing at least one of inorganic particles or inorganic fibers; and a covering material covering at least a part of the heat-insulating material, in which a sealed gap is formed between the heat-insulating material and the covering material, and the covering material is configured such that a communication opening that allows the gap to communicate with the outside of the covering material is formed at a temperature of 60° C. or more.