Battery Laminate Film Structure for Stacking and Thermal Expansion
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Solution Overview
Problem
Existing sheet material type batteries have uneven surfaces, which affect their stacking properties when modularized and do not effectively suppress thermal expansion.
Innovation Solution
A laminate film with an accommodating portion for an electrode body, featuring a side wall portion with an uneven portion to manage thermal expansion and a planar bottom wall portion for improved stacking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both faces of the sheet material type battery are formed in uneven forms to suppress thermal expansion, then thermal expansion is suppressed, but stacking properties deteriorate when batteries are accommodated in a case
Solution Approach 1:
The invention applies different surface characteristics to different regions of the battery: one face has an uneven form (with protrusions or recesses) to suppress thermal expansion, while the other face has a planar form to ensure good stacking properties when batteries are arranged in a case. This local differentiation resolves the contradiction between thermal management and modular assembly requirements.
2Temperature
If uneven plate materials are used to ensure heat dissipation characteristics, then heat dissipation is improved, but surfaces of the battery become uneven affecting modularization
Solution Approach 1:
The invention segments the surface characteristics into two distinct types: one surface maintains planarity for modular stacking, while the other surface incorporates uneven features (protrusions or recesses) that provide thermal expansion suppression and heat dissipation functionality. This segmentation allows each surface to independently fulfill its specific function without compromising the other.
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 laminate film ensures secure stacking properties while suppressing thermal expansion, enhancing the performance and reliability of battery cells and modules.
Implementation Method 1
even when gas is generated by repeated charging and discharging, the uneven portion expands and contracts, and thermal expansion can be suppressed
Data Source
AI summary
The laminate film includes an accommodating portion for accommodating the electrode body, and seals the electrode body in the accommodated state. The accommodating portion has a side wall portion facing the peripheral end face of the electrode body, and an uneven portion is provided on at least a part of the side wall portion.