Power Storage Cell Case Rib Structure for Welding Distortion
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Solution Overview
Problem
The existing power storage cell designs face distortion issues due to welding of end faces, which compromises the structural integrity of the case.
Innovation Solution
Incorporating a rib along the corner edge formed by the side and end face portions of the case, which increases the rigidity and helps suppress distortion during welding by extending the welding portion in the height direction and protruding either inward or outward from the corner edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the edges of the half end face portions are welded to each other, then the case structure is formed, but the case is distorted by welding
Solution Approach 1:
Ribs are provided on the end face portions before welding to preemptively counteract the distortion that will occur during the welding process. This preliminary structural reinforcement prevents the welding heat from causing excessive deformation of the case structure.
Solution Approach 2:
Ribs are strategically positioned at specific locations on the end face portions where welding distortion is most likely to occur. This localized reinforcement provides targeted structural support without adding unnecessary material throughout the entire case structure.
2Manufacturing precision
If a rib is added to increase corner edge rigidity, then welding distortion is suppressed, but the case size increases
Solution Approach 1:
Ribs are positioned only at the corner edges of the end face portions where welding distortion is most critical, rather than adding structural elements throughout the entire case. This localized approach provides maximum distortion suppression with minimal impact on overall case dimensions.
Solution Approach 2:
The ribs are designed with optimal dimensions that provide sufficient rigidity to suppress welding distortion while keeping their size as small as possible. The rib thickness and height are carefully controlled to achieve the minimum necessary reinforcement without excessive material addition.
Data Source
AI summary
In a power storage cell, a case includes a bottom portion, first and second side surface portions, first and second end face portions, a welding portion, and a rib. The first side surface portion extends upright from the bottom portion. The second side surface portion extends upright from the bottom portion and faces the first side surface portion. The first end face portion extends from the first side surface portion in a direction in which the first side surface portion faces the second side surface portion. The second end face portion extends from the second side surface portion in a direction in which the second side surface portion faces the first side surface portion. The welding portion connects the first and second end face portions to each other. The rib is located along a corner edge formed by the first side surface portion and the first end face portion.