Battery Pack Heat Suppression Sheet for Cooling and Thermal Isolation
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Solution Overview
Problem
Existing battery packs face challenges in maintaining surface temperature within a predetermined range during normal use while effectively cooling battery cells during abnormal high-temperature conditions, and preventing the propagation of heat between cells.
Innovation Solution
A heat transfer suppression sheet for battery packs, featuring a heat-insulating material with inorganic particles or fibers that release moisture when heated, and a covering material with concave and convex portions forming gaps, which provides insulation during normal use and facilitates cooling and heat dissipation during abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If 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 cycle
Solution Approach 1:
The heat transfer suppression sheet utilizes phase change materials that change their thermal properties based on temperature parameters. At normal operating temperatures, the material maintains heat insulation properties. When temperature exceeds a predetermined threshold, the material undergoes phase change (melting) which absorbs heat and transforms from an insulating state to a heat-dissipating state, thereby resolving the contradiction between heat insulation and cooling capability
Solution Approach 2:
The heat transfer suppression sheet transitions from a static heat-insulating structure to a dynamic system that adapts its thermal properties in response to temperature changes. The material dynamically switches between insulation mode (below threshold temperature) and heat dissipation mode (above threshold temperature) through phase change, enabling the system to optimize thermal management under different operating conditions
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 transfer suppression sheet is constructed as a composite material system combining phase change materials with heat-insulating base materials. This composite structure integrates multiple functions (heat absorption, heat insulation, and heat propagation suppression) into a single component, reducing the need for separate cooling and insulation systems while managing thermal behavior across different temperature ranges
Solution Approach 2:
The heat transfer suppression sheet serves multiple functions simultaneously: it acts as a heat-insulating barrier to suppress heat propagation between cells, provides active cooling through phase change heat absorption during normal operation, and maintains structural separation between battery cells. This multi-functionality eliminates the need for separate cooling plates, insulation layers, and spacers
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 heat transfer suppression sheet effectively cools individual battery cells during normal use, suppresses heat propagation between cells during abnormal conditions, and prevents thermal runaway, thereby ensuring the safe and efficient operation of battery packs.
Implementation Method 1
a heat-insulating material 71 containing inorganic particles or inorganic fibers, and a covering material 52 covering a surface 71a and a back surface 71b which are main surfaces of the heat-insulating material 71. The inorganic particles or inorganic fibers contained in the heat-insulating material 71 contain crystal water or adsorbed water, and the crystal water or adsorbed water is crystal water or adsorbed water which is water that is released as moisture when heated.
Implementation Method 2
concave portions 53a and convex portions 53b are formed on a surface 52a of the covering material 52. The convex portions 13b of the heat-insulating material 71 are bonded to the covering material 52, and gaps 14 are formed between the concave portions 53a of the covering material 52 and the heat-insulating material 71.
Implementation Method 3
a heat-insulating material 71 containing inorganic particles or inorganic fibers. Heat transfer from one plate member to another plate member is also suppressed by the low thermal conductive layer.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Provided are: a heat transfer suppression sheet for a battery pack that is used in a battery pack in which a plurality of battery cells are connected in series or in parallel, and that suppresses the transfer of heat between individual battery cells when abnormality occurs while making it possible to cool the individual battery cells during normal use; and a battery pack. The heat transfer suppression sheet (A10) for a battery pack is interposed between battery cells and used in a battery pack in which a plurality of battery cells are connected in series or in parallel. The heat transfer suppression sheet (A10) for a battery pack includes: a heat-insulating material (A11) containing at least one of inorganic particles and inorganic fibers; and a covering material (A12) covering at least part of the heat-insulating material (A11). Gaps (A14) are formed between the heat-insulating material (A11) and the covering material (A12).