Cylindrical Power Storage Module Lead Layout for Precise Terminal Joining
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Solution Overview
Problem
The existing electric power storage modules face challenges in accurately aligning the negative-electrode lead with the appropriate joining position on the outer covering can, leading to insulation distance and attachment tolerance issues.
Innovation Solution
The electric power storage module design includes a negative-electrode lead with a contact part that contacts the side surface of the device and a shoulder formed on the inner side, which includes a joint to the second terminal, utilizing a biasing part to align the lead accurately with the shoulder of the outer covering can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative-electrode lead is joined to the outer covering can, then electrical connection is achieved, but alignment accuracy and insulation distance become problematic
Solution Approach 1:
The lead structure introduces a contact part as an intermediary element that contacts the side surface of the outer covering can. This contact part serves as a mediator between the lead and the outer covering can, enabling accurate positioning and alignment during the joining process while maintaining proper insulation distance between the negative-electrode lead and the positive-electrode terminal
Solution Approach 2:
The lead is designed with a contact part that makes preliminary contact with the side surface of the outer covering can before the final joining to the second terminal occurs. This preliminary action establishes accurate alignment and positioning, ensuring that when the lead is subsequently joined to the second terminal, the alignment accuracy is already established and the insulation distance is properly maintained
2Reliability
If the lead is joined to the outer covering can, then electrical connection is established, but attachment tolerance increases
Solution Approach 1:
The contact part of the lead acts as an intermediary that contacts the side surface of the outer covering can, providing a reference surface for accurate positioning. This intermediary contact reduces attachment tolerance by establishing a precise geometric relationship between the lead and the outer covering can before the final joining to the second terminal
Solution Approach 2:
The design implements preliminary contact between the contact part and the side surface of the outer covering can, which establishes accurate alignment before the final joining operation. This preliminary action reduces attachment tolerance by pre-positioning the lead at the correct location and orientation
Data Source
AI summary
An electric power storage module includes at least one cylindrical electric power storage device. A positive-electrode terminal and a negative-electrode terminal are disposed at an upper end of the electric power storage device, the negative-electrode terminal is disposed on an outer side with respect to the positive-electrode terminal in a radial direction of the electric power storage device, a negative-electrode lead electrically connected to the negative-electrode terminal from an outer side in the radial direction is further provided, and the negative-electrode lead includes a contact part that is in contact with a side surface of the electric power storage device, and a shoulder that is formed on an inner side in the radial direction with respect to the contact part and includes a joint.