Battery Module Cover Protrusion Pattern for Flatness and Strength
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Solution Overview
Problem
Conventional battery module cover materials made of metal thin films experience twisting, bending, and reduced flatness during the molding process due to uneven patterns formed in a vertical direction, compromising mechanical strength and flatness.
Innovation Solution
A battery module cover material featuring first uneven patterns protruding and second uneven patterns recessed in the thickness direction, with controlled recess depths and ratios, to enhance mechanical strength and flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an uneven pattern is formed in a vertical direction on a metal thin film cover material to bear load, then mechanical strength is improved, but flatness significantly decreases and twisting or bending occurs during molding
Solution Approach 1:
The patent transitions from forming patterns in only the vertical direction to forming patterns in multiple directions (vertical and horizontal). The first uneven patterns extend in the vertical direction while the second uneven patterns extend in the horizontal direction, creating a multi-dimensional pattern structure that distributes stress more effectively and maintains flatness during molding
Solution Approach 2:
The patent introduces asymmetry by creating two distinct types of uneven patterns with different orientations and characteristics. The first uneven patterns have different geometric features than the second uneven patterns, allowing each to fulfill different functional roles in load bearing and flatness maintenance
2Weight of moving object
If the thickness of the cover material is reduced to minimize volume and weight, then weight and volume are decreased, but mechanical strength and flatness are compromised
Solution Approach 1:
The patent applies local quality by creating uneven patterns with varying heights, widths, and spacing in different regions of the cover material. This allows the thin film to have enhanced mechanical properties at critical locations while maintaining overall thinness for weight reduction
Solution Approach 2:
The patent creates a composite structure by combining the base metal thin film with an uneven pattern overlay. This composite approach allows the thin film to achieve mechanical strength comparable to thicker materials while maintaining the weight advantages of thin construction
Data Source
AI summary
The present invention relates to: a battery module cover member that has a pattern of protrusions protruding in different directions formed thereon, and thus has improved flatness; a battery module case including the cover member; and a battery module including the same. Although manufactured as a thin film, the battery module cover member has excellent mechanical strength and flatness due to the formation of a pattern of protrusions protruding in opposite directions.