Battery Insulating Plate With Pressure-Responsive Vent Openings
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Solution Overview
Problem
Existing secondary batteries face challenges in efficiently managing electrolyte solution injection and gas discharge due to fixed opening areas in insulating plates, which can lead to inadequate sealing and potential explosion risks.
Innovation Solution
An insulating plate with thin film portions that can be deformed by external pressure to adjust the opening area, allowing for automatic expansion during electrolyte solution injection and gas discharge, while returning to a closed state after completion, ensuring reliable insulation between the electrode assembly and cap assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed opening area is used in the insulating plate, then the sealing reliability is improved, but the efficiency of electrolyte solution injection and gas discharge deteriorates
Solution Approach 1:
The insulating plate incorporates thin film portions that can dynamically change their opening area in response to internal pressure changes. During electrolyte solution injection, the thin film portions expand to increase the opening area, facilitating efficient injection. During normal operation, they return to a closed state to maintain sealing reliability. This dynamic adaptability resolves the contradiction between fixed sealing reliability and variable injection efficiency.
2Device complexity
If a fixed opening area is used in the insulating plate, then the structural simplicity is improved, but the gas discharge capability deteriorates
Solution Approach 1:
The thin film portions are designed to automatically expand when internal pressure increases due to gas generation, creating larger openings for efficient gas discharge. When pressure returns to normal, the thin films return to their closed state. This dynamic response mechanism improves gas discharge capability without requiring complex control systems, maintaining relative structural simplicity while enhancing harmful factor management.
3Productivity
If the opening area is enlarged for efficient electrolyte solution injection, then the injection efficiency is improved, but the sealing reliability deteriorates
Solution Approach 1:
The thin film portions provide dynamic control of the opening area, expanding only when needed for electrolyte solution injection and returning to a closed state afterward. This temporal separation of functions allows large opening areas during injection for high efficiency, while maintaining small opening areas during normal operation for reliable sealing, thus resolving the contradiction between injection efficiency and sealing reliability.
4Object-generated harmful factors
If the opening area is enlarged for gas discharge, then the gas discharge capability is improved, but the sealing reliability deteriorates
Solution Approach 1:
The thin film portions automatically adjust the opening area based on internal pressure conditions. When gas pressure increases, the thin films expand to create larger openings for effective gas discharge. When pressure normalizes, they return to a closed state to maintain sealing reliability. This pressure-responsive dynamic adjustment resolves the contradiction between gas discharge capability and sealing reliability.
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 enables efficient electrolyte solution injection and gas discharge while maintaining reliable insulation, reducing the risk of explosion and improving the overall performance of secondary batteries.
Implementation Method 1
the thin film portions are configured to be deformed by external pressure to change an opening area of the insulating plate
Implementation Method 2
The thin films may be configured to be deformed convexly toward the electrode assembly when the electrolyte solution is injected to enlarge the opening area of the insulating plate, and may be configured to return to an initial position after the electrolyte solution injected
Data Source
AI summary
The secondary battery comprises an electrode assembly including a lead tab, a case accommodating the electrode assembly and an electrolyte solution, a cap assembly electrically connected to the lead tab, and coupled to the case to seal the case, and an insulating plate between the electrode assembly and the cap assembly in the case, defining a tab opening for drawing out the lead tab, and including thin film portions respectively defining cutouts for passage of electrolyte solution or gas.