Heat Transfer Suppression Sheet for Uniform Battery Cell Pressure
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Solution Overview
Problem
Existing battery separators apply uneven pressure to battery cells due to elastic layers, leading to variations in repulsive force and potential shortening of battery lifetime.
Innovation Solution
A heat transfer suppression sheet comprising a heat insulation material with an elastic sheet and a resin film, where the elastic sheet end surfaces are inclined inward, distributing pressure more evenly across the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an elastic layer is used in the separator to absorb battery cell expansion, then the ability to accommodate expansion is improved, but the uniformity of pressing force becomes poor
Solution Approach 1:
The patent introduces a deformation space between the battery cell and separator, allowing different regions to have different functions: the elastic layer provides expansion absorption capability while the deformation space enables localized displacement to maintain uniform pressure distribution across the battery cell surface
2Temperature
If a rigid heat insulation sheet is used, then heat insulation performance is improved, but the ability to accommodate battery cell expansion is poor
Solution Approach 1:
The patent creates a composite structure combining a rigid heat insulation sheet with a flexible elastic layer and deformation space. This composite design allows the system to simultaneously achieve excellent heat insulation performance from the rigid sheet and expansion accommodation capability through the elastic layer's deformation and the deformation space's displacement mechanism
3Adaptability or versatility
If the elastic layer is made thicker to improve expansion absorption, then the expansion absorption capability is improved, but the pressing force uniformity deteriorates
Solution Approach 1:
The patent introduces a spatial dimension by creating a deformation space between the battery cell and separator. This allows the elastic layer to deform in multiple directions and the separator to displacement outward, distributing the expansion absorption across different spatial dimensions while maintaining uniform pressure on the battery cell surface
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 sheet provides uniform pressure distribution, absorbing cell expansion in low-pressure regions and preventing uneven force application, thus extending battery life and suppressing heat transfer.
Implementation Method 1
an elastic sheet stacked on the heat insulation material... at least one end surface of the plurality of elastic sheet end surfaces is pressed by the resin film to be inclined inward
Implementation Method 2
a heat insulation material containing an inorganic particle... heat transfer suppression sheet
Implementation Method 3
the expansion of the battery cell can be absorbed without difficulty... when the separator is pressed by the expanding battery cell, the elastic protruding portion is pushed out into the deformation space and is thinner
Data Source
Figure 1A
Figure 1B~2
Figure 3A~3C
AI summary
To provide a heat transfer suppression sheet capable of reducing unevenness of a pressing force applied to a battery cell by an elastic sheet and suppressing a decrease in lifetime of a battery. A heat transfer suppression sheet (10) includes a heat insulation material (11) containing an inorganic particle, an elastic sheet (12) stacked on the heat insulation material (11), and a resin film (13) covering the heat insulation material (11) and the elastic sheet (12). The heat insulation material (11) has a pair of heat insulation material main surfaces (11a) orthogonal to a thickness direction, and the elastic sheet (12) has a pair of elastic sheet main surfaces (12a) orthogonal to a thickness direction and a plurality of elastic sheet end surfaces (12b) connecting the pair of elastic sheet main surfaces (12a). In addition, the heat insulation material (11) and the elastic sheet (12) are stacked such that the heat insulation material main surface (11a) and the elastic sheet main surface (12a) face each other. Further, at least one end surface of the plurality of elastic sheet end surfaces (12b) is pressed by the resin film (13) to be inclined inward as being away from the heat insulation material (11).