Can-Type Battery Inlet Sealing for Electrolyte Replenishment
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Solution Overview
Problem
Can-type secondary batteries face issues with electrolyte leakage and contamination during pre-charging and aging processes, and require a reliable sealing mechanism for the electrolyte inlet while allowing for further electrolyte impregnation.
Innovation Solution
A secondary battery design featuring a can-type case with an electrolyte inlet sealed by a first thin film cover and a second thin film cover, where the first cover has a through-hole formed by a vent line that ruptures under pressure, and the second cover seals the inlet and through-hole, with adhesive forces ensuring secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a can-type case with electrolyte inlet is used, then electrolyte impregnation is improved, but electrolyte leakage and contamination occur during pre-charging and aging processes
Solution Approach 1:
A sealing member is installed at the electrolyte inlet before pre-charging and aging processes to prevent electrolyte leakage and contamination. The sealing member is preliminarily positioned to seal the inlet during processes where leakage could occur, allowing safe electrolyte impregnation without the harmful effects of leakage.
2Object-affected harmful factors
If electrolyte inlet is sealed to prevent leakage, then contamination is prevented, but further electrolyte replenishment becomes difficult
Solution Approach 1:
The sealing member is designed to be dynamically removable and reinstallable. It can be taken off to allow electrolyte replenishment and then reinstalled to maintain sealing. This dynamic capability enables the system to switch between sealed operation (preventing contamination) and open operation (allowing replenishment) as needed.
3Adaptability or versatility
If sealing member is made removable for electrolyte replenishment, then adaptability is improved, but sealing reliability may be compromised
Solution Approach 1:
The sealing system is segmented into a removable sealing member and a corresponding sealing structure. This segmentation allows the sealing member to be independently removed for replenishment while maintaining a reliable sealing interface when installed. The segmented design enables both adaptability (removability) and reliability (secure sealing when closed).
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 prevents electrolyte leakage and internal contamination, allows for efficient electrolyte impregnation, and facilitates easy replenishment of electrolyte, thereby enhancing battery life characteristics.
Implementation Method 1
the through-hole being formed by rupturing a vent line on an outer portion of the electrolyte inlet of the first thin film cover, the vent line being thinner than a remaining region of the first thin film cover
Implementation Method 2
each of the first thin film cover and the second thin film cover may include an adhesive layer under the substrate layer
Data Source
AI summary
A secondary battery includes a can-type case accommodating an electrode assembly, an electrolyte inlet on a first end of the case, and configured to allow an electrolyte to be injected therethrough, a first thin film cover sealing the electrolyte inlet, and having a through-hole, and a second thin film cover sealing the electrolyte inlet and the through-hole, and located on the first thin film cover.