Power Storage Module Seal Rib for Uniform Projection Thickness
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Solution Overview
Problem
The existing power storage module designs, particularly those formed by injection molding of resin, often result in varying thicknesses of projecting portions, which can compromise the strength of the module.
Innovation Solution
Incorporating a rib structure with a plate-like body part and a column part on the overhang, where the column part is thicker than the body part, to control the resin flow during injection molding, ensuring equal resin distribution and consistent thickness of the projecting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If injection molding is performed with a forming space of the rib as an injection port of resin, then the resin flows into the first side surface portion and second side surface portion, but the thicknesses of the pair of projecting portions may differ
Solution Approach 1:
The patent applies local quality by making the second side surface portion thicker than the first side surface portion. This local thickness variation compensates for the resin flow imbalance caused by the rib structure, ensuring that the resin reaches both projecting portions with sufficient pressure and volume to achieve uniform thickness. The different thicknesses create different flow resistance characteristics that balance the overall resin distribution.
Solution Approach 2:
The patent introduces asymmetry in the side surface part by deliberately making the second side surface portion thicker than the first side surface portion. This asymmetric design breaks the symmetry of the resin flow paths, creating different flow characteristics that compensate for the position-dependent flow resistance. The asymmetric thickness distribution ensures balanced resin filling despite the asymmetric influence of the rib structure.
2Productivity
If the thicknesses of the pair of projecting portions are different, then the injection molding can be performed, but the strength of the power storage module may not be ensured
Solution Approach 1:
The patent applies local quality by varying the thickness of the side surface part at different locations. The second side surface portion is made thicker to compensate for resin flow deficiencies, ensuring adequate material distribution to both projecting portions. This local thickness variation ensures uniform projecting portion thickness, which is critical for maintaining the structural strength and load-bearing capacity of the power storage module.
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
This approach ensures that the resin flows more easily into the first side surface portion than the second, thereby maintaining consistent thicknesses of the projecting parts, enhancing the overall strength and reliability of the power storage module.
Implementation Method 1
paths of the resin from the rib to a forming space of the first side surface portion include a path in which the rib and the first side surface portion are directly connected without passing through a forming space of the overhang as well as a path that passes through the overhang
Data Source
AI summary
A power storage module includes an electrode stack and a seal. The electrode stack includes a first end surface and a second end surface and a side surface. The seal includes: a side surface part; a first projecting part projecting onto the first end surface; a second projecting part projecting onto the second end surface; an overhang extending outward of the electrode stack; and a rib provided on the overhang. The side surface part includes a connecting portion to which the overhang is connected, a first side surface portion positioned between the connecting portion and the 10 first projecting part, and a second side surface portion positioned between the connecting portion and the second projecting part. The rib connects the overhang and the first side surface portion, and wherein the second side surface portion is thicker than the first side surface portion in a direction orthogonal to the side surface.