Cylindrical Cell Lid Recessed Contacts for Reliable Electrode Roll Joining
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Solution Overview
Problem
The existing design of rechargeable batteries, particularly lithium-ion batteries, faces challenges in production speed, cost, and safety, with a need for improved manufacturing efficiency and reduced component complexity while ensuring reliable electrical connections and safe gas release mechanisms.
Innovation Solution
A cylindrical secondary cell lid with multiple recessed contact portions, designed to provide direct electrical contact with an electrode roll, featuring a flange and recessed areas that facilitate efficient assembly and electrical conductivity, along with a vent mechanism for safe gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flat contact portions are used on the lid, then manufacturing is simpler, but electrical contact reliability with the electrode roll is insufficient
Solution Approach 1:
The contact surface is divided into multiple recessed contact portions instead of a single flat surface. Each recessed portion creates a localized contact zone with the electrode roll, distributing the electrical contact across multiple points and improving overall contact reliability while maintaining manufacturing feasibility.
Solution Approach 2:
The lid features localized recessed areas with different geometries (trapezoid or truncated annulus) at specific positions to optimize electrical contact with the electrode roll. These localized modifications provide enhanced contact quality at critical points without requiring complex changes to the entire lid structure.
2Reliability
If multiple separate contact components are used to ensure reliable electrical contact, then electrical connection reliability improves, but component count and assembly complexity increase
Solution Approach 1:
The lid integrates multiple contact functions into a single component structure. The recessed contact portions are formed directly on the lid body, eliminating the need for separate contact components or additional assembly steps. This merging approach maintains reliable electrical connection while reducing overall component count.
Solution Approach 2:
The lid serves multiple functions: it provides structural closure, electrical contact, and mechanical support. The recessed contact portions enable the lid to perform electrical connection functions directly, making the lid a multi-functional component that reduces the need for additional specialized parts.
3Reliability
If larger contact area is used on the lid, then electrical conductivity improves, but the lid structure becomes more complex
Solution Approach 1:
The total contact area is segmented into multiple recessed contact portions distributed across the lid surface. This segmentation achieves a large effective contact area for improved conductivity while avoiding the need for a single large complex structure, as each recessed portion can be independently formed with simple geometry.
4Productivity
If traditional lid design without recesses is used, then manufacturing is easier and faster, but assembly with electrode roll requires additional alignment steps
Solution Approach 1:
The recessed contact portions are pre-formed on the lid during lid manufacturing, creating built-in alignment features. This preliminary action eliminates the need for separate alignment steps during assembly with the electrode roll, as the recesses naturally guide and position the electrode roll contacts, improving assembly efficiency without significantly complicating the manufacturing process.
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
The design enhances manufacturing efficiency by simplifying assembly, reduces component count, and ensures reliable electrical connections with low internal resistance, while providing a safe mechanism for gas discharge.
Implementation Method 1
The cylindrical secondary cell lid comprises a number of recessed contact portions to be arranged in direct electrical contact with an electrode roll arranged inside the cylindrical secondary cell
Data Source
AI summary
This disclosure presents a cylindrical secondary cell lid (1) for a cylindrical secondary cell (10), the cylindrical secondary cell lid (1) comprising a number of recessed contact portions (2) to be arranged in direct electrical contact with an electrode roll (20) arranged inside the cylindrical secondary cell (10), the area of the recessed contact portions (2) being 50 to 80 percent of the total area of the cylindrical secondary cell lid (1).