Wound Power Storage Cell Insulation for Lid Contact and Electrolyte Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing power storage cells face issues where the lid may come into contact with the electrode assembly when an external force is applied, and there is a risk of electrolyte solution insufficiency at the upper portion of the electrode assembly due to leakage during expansion and contraction.
Innovation Solution
A power storage cell design featuring a wound electrode assembly with protruding tabs, a cell case with an insulating member that includes a covering portion with a holding portion to prevent lid contact and retain electrolyte solution, ensuring adequate solution supply during expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lid is positioned to close the opening of the case main body, then the sealing and structural integrity are improved, but the lid may come into contact with the electrode assembly when external force is applied
Solution Approach 1:
An insulating member is introduced as an intermediary component between the lid and the electrode assembly. This insulating member includes a covering portion that extends from the insulating member toward the electrode assembly, positioned between the lid and the electrode assembly to prevent direct contact while maintaining the sealing function of the lid.
2Productivity
If the electrode assembly is allowed to expand and contract freely, then the electrochemical performance is improved, but the electrolyte solution becomes insufficient at the upper portion when contracted
Solution Approach 1:
The insulating member is pre-filled with electrolyte solution in advance. When the electrode assembly contracts and the upper portion becomes deficient in electrolyte solution, the pre-stored electrolyte solution in the insulating member can be supplied to the electrode assembly, ensuring continuous adequate electrolyte supply without compromising the expansion-contraction performance.
3Reliability
If the insulating member is added to prevent lid contact, then the electrical insulation is improved, but the device complexity increases
Solution Approach 1:
The insulating member is designed to perform multiple functions simultaneously: it provides electrical insulation between the lid and electrode assembly, prevents direct contact through its covering portion, stores electrolyte solution in its internal space, and supplies electrolyte to the electrode assembly when needed. This multi-functionality reduces the need for separate components for each function.
Data Source
AI summary
A power storage cell includes: an electrode assembly constituted of a wound body in which a plurality of positive electrode tabs and a plurality of negative electrode tabs are wound to protrude upward; a cell case; and an insulating member. The cell case has a case main body and a lid. The insulating member has a covering portion that covers an upper surface of the electrode assembly, and the covering portion has a holding portion that holds an electrolyte solution leaked from the electrode assembly.