Secondary Battery Pack Electrode Terminal Sealing via Bonding Cover
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Solution Overview
Problem
The existing secondary battery pack sealing structures, particularly using O-rings, are prone to leakage due to internal pressure and temperature increases, and dimensional errors, resulting in degraded sealing properties between the electrode terminal and the pack case through hole.
Innovation Solution
A secondary battery pack design featuring a bonding part that fills the gap between the through hole and the electrode terminal, combined with a bonding cover that is shrink-fitted to the terminal, providing an adhesive layer and stable fixation, enhancing sealing efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an O-ring is used to seal between the electrode terminal and the terminal installation through hole, then the sealing structure is simple and easy to manufacture, but the sealing property degrades when internal pressure and temperature increase or when dimensional errors occur
Solution Approach 1:
The sealing structure is divided into multiple components: a sealing ring that fits into a groove on the terminal installation through hole, and a sealing member that contacts both the sealing ring and the electrode terminal. This segmentation allows each component to perform its specific sealing function independently, improving overall reliability while maintaining manufacturing simplicity.
Solution Approach 2:
The sealing ring acts as an intermediary component between the terminal installation through hole and the electrode terminal. It is installed in a groove on the through hole and works in conjunction with the sealing member to create a reliable seal, preventing direct contact and potential leakage paths between the through hole and terminal.
2Device complexity
If the O-ring is relied upon for sealing, then the device complexity is low, but leakage occurs around the terminal installation through hole under increased internal pressure and temperature
Solution Approach 1:
The sealing system is segmented into a sealing ring mounted in a groove on the terminal installation through hole and a separate sealing member that contacts both the sealing ring and electrode terminal. This segmentation creates multiple sealing interfaces that collectively prevent leakage under increased internal pressure and temperature conditions.
Solution Approach 2:
The sealing ring is pre-installed in a groove on the terminal installation through hole, providing a prepared sealing interface before the electrode terminal is inserted. This beforehand preparation ensures that the sealing structure is ready to handle pressure and temperature increases without leakage.
3Manufacturing precision
If dimensional error or assembling error occurs during manufacturing, then manufacturing tolerance is relaxed, but the sealing property between the terminal installation through hole and electrode terminal greatly degrades
Solution Approach 1:
The sealing structure is segmented into a sealing ring that fits into a groove on the terminal installation through hole and a sealing member that bridges the gap between the sealing ring and electrode terminal. This segmentation accommodates dimensional variations and assembling errors while maintaining effective sealing properties.
Solution Approach 2:
The sealing member is designed to deform or adjust its shape to accommodate dimensional errors in the terminal installation through hole or electrode terminal. This parameter change allows the sealing structure to adapt to manufacturing variations while maintaining reliable sealing.
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 effectively maintains a stable sealing property and positions the electrode terminal securely, even with dimensional errors, preventing leakage and ensuring electrical stability.
Implementation Method 1
a bonding cover attached to the through hole of the pack case while surrounding a boundary of the electrode terminal above the bonding part
Data Source
AI summary
Provided is a secondary battery pack including: a cell assembly including a secondary battery, and a stacking frame supporting the secondary battery and stacked in a direction; a pack case having an internal space for accommodating the cell assembly, and having a through hole in internal and external directions; an electrode terminal electrically connected to the cell assembly and protruding to an outer part of the pack case by passing through the through hole; a bonding part filling a gap between the through hole and the electrode terminal in order to form an adhesive layer; and a bonding cover attached to the through hole of the pack case while surrounding a boundary of the electrode terminal above the bonding part.