Battery Case Insulation at Welded Lid Boundaries
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Solution Overview
Problem
The existing secondary battery designs face issues with insufficient insulating properties at the boundary portion between the case and the lid, which can lead to melting of the insulating film during welding, compromising the battery's insulation.
Innovation Solution
A power storage device is designed with a metal case body and a closing plate, both covered with an insulating sheet. A covering portion made of an insulating material is injected to cover the boundary portion between the case body and the closing plate, ensuring effective insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lid portion is welded to the box-shaped portion, then the opening is closed and structural integrity is improved, but the insulating film at the boundary portion melts and insulating properties deteriorate
Solution Approach 1:
An insulating sheet is pre-installed on the inner surfaces of both the case body and closing plate before welding. This preliminary insulation layer is positioned to cover the boundary portion where welding will occur, preventing the insulating film from melting during the welding process and ensuring insulating properties are maintained after assembly.
Solution Approach 2:
An insulating material is injected into the case body to form a covering portion that acts as an intermediary layer at the boundary portion between the case body and closing plate. This intermediate insulating material fills the gap and covers the boundary area, preventing direct contact and heat transfer during welding, thus protecting the insulating film from melting while maintaining structural integrity.
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 solution ensures reliable insulating properties, preventing the melting of the insulating film during welding and maintaining the battery's insulation integrity.
Implementation Method 1
an injection step of injecting an insulating material from outside of the case body into the case body so as to form a covering portion covering a boundary portion
Implementation Method 2
an insulating sheet covering an inner surface of the case body and an inner surface of the closing plate
Data Source
AI summary
A power storage device includes a case body made of metal and having an opening that opens in at least one direction, a power storage module placed inside the case body, a closing plate made of metal and welded to the case body so as to close the opening of the case body, an insulating sheet covering an inner surface of the case body and an inner surface of the closing plate, and a covering portion made of an insulating material and covering a boundary portion between the inner surface of the case body and the inner surface of the closing plate.