Wound Battery Cell Insulator Layout for Tab-to-Housing Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery structures face issues of internal short circuits due to electrode tab contact with the battery housing, increased manufacturing complexity and cost, and inefficient use of space leading to reduced energy density.
Innovation Solution
A battery design with an insulator interposed between the uncoated electrode regions and the battery housing, using a first cover portion to cover the uncoated region and a second cover portion to cover the outer circumferential surface, minimizing movement and preventing electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the positive electrode tab extends upward to maximize current collection efficiency, then the current collection efficiency is improved, but the risk of electrical contact with the battery housing increases causing short circuit
Solution Approach 1:
An insulator is introduced as an intermediary component between the positive electrode tab and the battery housing. The insulator prevents electrical contact while allowing the tab to maintain its upward extension for current collection, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The insulator is extracted as a separate functional component from the battery housing structure. By taking out the insulation function as a distinct element, the design allows the electrode tab to extend freely for current collection while the insulator independently prevents short circuit risk
2Stability of the object's composition
If additional components are added to prevent jelly roll movement, then the stability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The insulator is designed to serve multiple functions simultaneously: it provides electrical insulation to prevent short circuits and acts as a structural support to prevent jelly roll movement. This multi-functionality improves stability without adding manufacturing complexity or cost
Solution Approach 2:
The insulation function and structural support function are merged into a single insulator component. By combining these functions, the design achieves jelly roll stability without requiring additional components, thus avoiding increased manufacturing complexity
Data Source
AI summary
Discussed is a battery that may include an electrode assembly including a first electrode, a second electrode and a separator wound around a winding axis, wherein the first electrode includes a first active material region coated with a first active material layer and a first uncoated region not coated with the first active material layer, and at least a part of the first uncoated region being an electrode tab; a first current collector coupled to at least a part of the first uncoated region on the electrode assembly; a battery housing to accommodate the electrode assembly and the first current collector; and an insulator interposed between at least one of the first uncoated region and the first current collector and an inner surface of the battery housing facing the at least one of the first uncoated region and the first current collector to block an electrical connection between the battery housing and the at least one of the first uncoated region and the first current collector.