Cylindrical Cell Module Holder for Lead Insulation and Slip Prevention
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Solution Overview
Problem
In conventional electricity storage modules, maintaining an adequate insulation distance between the negative electrode lead and the sealing body while ensuring a sufficient joining region for the negative electrode lead is challenging, and the negative electrode lead may slip under the restriction part due to dimensional tolerances or positional displacements.
Innovation Solution
The electricity storage module incorporates an upper holder with a restriction part positioned inside the radial direction of the negative electrode lead, which restricts the lead from slipping and maintains an adequate insulation distance, allowing for a sufficient joining region by using a thermoplastic resin holder with specific features like a restriction part, cut-out section, and sloping parts to facilitate secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the negative electrode lead extends toward the inside of the outer covering can in the radial direction, then the joining region between the negative electrode lead and the outer covering can is increased, but the insulation distance between the negative electrode lead and the sealing body cannot be maintained
Solution Approach 1:
The restriction part extends in the axial direction (vertical dimension) rather than only in the radial direction, creating a three-dimensional constraint structure. This allows the restriction part to effectively limit the negative electrode lead's radial position while maintaining adequate insulation distance from the sealing body, resolving the contradiction between joining region and insulation distance.
2Object-affected harmful factors
If the length in the radial direction of the joining region between the negative electrode lead and the outer covering can is reduced to maintain insulation distance, then the insulation distance is kept, but it is difficult to secure a sufficient joining region
Solution Approach 1:
The restriction part acts as an intermediary structure between the negative electrode lead and the holder. It provides a dedicated constraint surface that actively limits the lead's position, allowing the joining region to be sufficiently long while maintaining insulation distance. The intermediary structure mediates the spatial relationship between conflicting requirements.
3Reliability
If a restriction part is positioned inside than the negative electrode in the radial direction to prevent slipping, then slipping is suppressed, but gaps due to dimensional tolerance may cause the negative electrode lead to slip under the restriction part
Solution Approach 1:
The restriction part is designed with a bottom surface that protrudes toward the lower part in advance, creating a preliminary constraint before assembly. This preliminary action ensures that even with dimensional tolerances, the negative electrode lead is pre-positioned and constrained, preventing slipping under the restriction part during operation.
Solution Approach 2:
The protruding bottom surface of the restriction part provides beforehand cushioning by creating a mechanical stop that compensates for dimensional tolerances. This prior cushioning ensures that gaps between components do not allow the negative electrode lead to slip, as the restriction part's bottom surface actively prevents such movement.
4Reliability
If the restriction part is designed to actively constrain the negative electrode lead with a protruding bottom surface, then slipping is suppressed and insulation distance is maintained, but the holder structure becomes more complex
Solution Approach 1:
The restriction part is merged with the holder as an integrated structure rather than a separate component. This combining approach allows the holder to perform multiple functions: holding the electricity storage device, providing the restriction part for lead constraint, and maintaining insulation distance. The integration reduces the number of separate parts while achieving the desired reliability.
Data Source
AI summary
At least one cylindrical electricity storage device, and an upper holder for holding an upper end side of the electricity storage device are included. A positive electrode terminal and a negative electrode terminal are disposed on an upper end part of the electricity storage device, and the negative electrode terminal is positioned in the outer side than the positive electrode terminal in a radial direction of the electricity storage device. A negative electrode lead connected to the negative electrode terminal from the outer side in the radial direction is further included. The upper holder includes a restriction part positioned in the inner side than at least a part of the negative electrode lead. A bottom surface of the restriction part protrudes toward the lower part than the surface facing an end part of one side of the electricity storage device in the upper holder.