Cylindrical Power Storage Module Lead Restraint for Insulation Spacing
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Solution Overview
Problem
Existing power storage modules face challenges in securing a sufficient joining region for the negative electrode lead while maintaining an insulation distance between the negative electrode lead and the positive electrode, leading to potential contact and short circuits.
Innovation Solution
The power storage module incorporates a holder with a restricting portion that limits the negative electrode lead's radial movement, ensuring a secure joining region and insulation distance by using a thermoplastic resin holder with cutouts and restricting parts to accommodate the lead, preventing contact with the positive electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the negative electrode lead protrudes radially inward of the outer covering can at the time of welding, then the joining region between the negative electrode lead and the shoulder portion is improved, but the insulation distance between the negative electrode lead and the sealing body cannot be maintained
Solution Approach 1:
The holder acts as an intermediary component between the negative electrode lead and the sealing body. The restricting portion of the holder mediates the spatial relationship by limiting the radial inward movement of the negative electrode lead, thereby maintaining both sufficient joining region and adequate insulation distance simultaneously
2Reliability
If the radial length of the joining region is reduced to maintain insulation distance, then the insulation distance between the negative electrode lead and the sealing body is improved, but it becomes difficult to secure a sufficient joining region for joining
Solution Approach 1:
The holder introduces a new spatial dimension by positioning the restricting portion at a specific radial location. This dimensional control allows the negative electrode lead to maintain optimal positioning where both joining region length and insulation distance are sufficient, resolving the trade-off through precise spatial arrangement
Data Source
AI summary
A power storage module includes: at least one cylindrical power storage device; and an upper holder that holds an upper end side of the power storage device; in which a positive-electrode terminal and a negative-electrode terminal are disposed at an end part on the upper end part of the power storage device, the negative-electrode terminal is disposed outside the positive-electrode terminal in a radial direction of the power storage device, the power storage module further includes a negative electrode lead connected to the negative-electrode terminal from an outer side in the radial direction, and the upper holder includes a restricting part located inside at least a part of the lead in the radial direction.