Electricity Storage Case Sealing That Isolates Gaskets From Welding Heat
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Solution Overview
Problem
The gasket in the sealing body of existing electricity storage devices deteriorates due to heat during welding, compromising the sealing integrity.
Innovation Solution
The design includes a case with a tubular part, a curved part, and a groove part, where the sealing body has a conductive sealing plate and an insulating gasket, with the opening rim not contacting the gasket, thereby preventing heat transfer during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first collector member is welded onto the rim of the opening of the case, then the collector structure is simplified and electrical connection is achieved, but the gasket deteriorates due to heat at the welding
Solution Approach 1:
The curved part is segmented into three distinct functional zones: the opening rim for collector welding, the crimp part for sealing, and the groove part for gasket positioning. This segmentation allows the opening rim to be welded without heat transfer to the gasket, as the heat-affected zone is confined to the opening rim region only.
Solution Approach 2:
The crimp part acts as an intermediary element between the opening rim and the groove part. It serves as a thermal barrier that prevents heat from the welded opening rim from transferring to the gasket in the groove part, while still maintaining structural integrity and sealing function.
2Reliability
If the rim of the opening is pressed onto the gasket to achieve secure contact, then sealing is improved, but the gasket deteriorates due to heat from welding
Solution Approach 1:
The curved part is divided into distinct segments where the opening rim, crimp part, and groove part each have separate functions. The groove part houses the gasket without direct contact to the opening rim, preventing heat transfer while maintaining sealing integrity through the crimp part's compression action.
Solution Approach 2:
The gasket is extracted from direct contact with the opening rim and placed in the groove part instead. This extraction removes the gasket from the heat-affected zone of welding while maintaining its sealing function through compression by the crimp part.
3Reliability
If the gasket is compressed between the sealing plate and the crimp part, then sealing integrity is maintained, but heat from welding still reaches the gasket
Solution Approach 1:
The curved part is segmented into the opening rim, crimp part, and groove part, creating thermal zones. The groove part containing the gasket is thermally isolated from the opening rim welding zone by the crimp part, allowing compression sealing without heat exposure.
Solution Approach 2:
The crimp part serves as a thermal intermediary that compresses the gasket for sealing while blocking heat transfer from the welded opening rim. This intermediary function maintains both sealing integrity and thermal protection simultaneously.
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
This configuration suppresses gasket deterioration, maintaining sealing integrity and extending the device's lifespan.
Implementation Method 1
a gasket (133) having electric insulation, the gasket being compressed between the sealing plate (131) and a portion of the crimp part (1122) facing the groove part (1123)
Data Source
AI summary
An electricity storage device includes: an electrode group including first and second electrodes; a case accommodating the electrode group therein, the case having an opening provided therein; and a sealing body covering the opening of the case. The case includes a tubular part, a curved part connected to one end of the tubular part, and a bottom part closing another end of the tubular part. The curved part includes an opening rim, a crimp part connected to the opening rim, and a groove part connected to the crimp part, the crimp part being located outward from the opening rim along a radial direction of the tubular part, the groove part being recessed to protrude inward in the radial direction of the tubular part and having an annular shape. The sealing body includes: a sealing plate having conductivity; and a gasket having electric insulation, the gasket being compressed between the sealing plate and a portion of the crimp part facing the groove part and between the sealing plate and an inner surface of the groove part. The case is electrically connected to the first electrode. The sealing plate is electrically connected to the second electrode. The opening rim does not contact the gasket.