Battery Cover Plate Threaded Sealing for Injection Hole Leakage
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Solution Overview
Problem
Existing battery sealing methods involving welding of sealing nails are complex, costly, prone to poor welding due to electrolyte volatization, and result in deteriorating sealing performance over time, posing safety hazards.
Innovation Solution
A battery cover plate design that seals the liquid injection hole using a first seal with a threaded hole, a second seal with a head and connecting part, and a sealing ring, allowing for thread-based connection without welding, enhanced by adhesive layers for improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to seal the liquid injection hole, then sealing is achieved, but welding quality deteriorates due to electrolyte volatization and the process becomes complex and costly
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical sealing system consisting of a sealing component and sealing nails that are pressed or screwed into place. This substitution eliminates the complexity and quality issues associated with welding while maintaining effective sealing of the liquid injection hole.
Solution Approach 2:
The patent extracts and removes the welding process from the sealing methodology entirely. By eliminating welding and replacing it with a purely mechanical sealing approach using sealing nails and a sealing component, the patent simplifies the process and avoids the harmful effects of electrolyte volatization during welding.
2Reliability
If welding is used to seal the liquid injection hole, then sealing is achieved, but cost increases due to welding expenses
Solution Approach 1:
The patent substitutes the expensive welding process with a simpler mechanical sealing system using sealing nails and a sealing component. This mechanical approach reduces manufacturing costs while maintaining reliable sealing performance, as it eliminates the need for specialized welding equipment and processes.
Solution Approach 2:
The patent employs inexpensive sealing components and sealing nails that can be easily manufactured and replaced if necessary. These mechanical sealing elements are far cheaper than the welding process, providing cost-effective sealing without compromising long-term reliability.
3Reliability
If rubber particles are used for sealing, then initial sealing is achieved, but sealing performance deteriorates during long-term use
Solution Approach 1:
The patent uses a composite sealing system combining a sealing component (which may be made of durable materials resistant to electrolyte degradation) with sealing nails. This composite structure provides both initial sealing effectiveness and long-term durability, overcoming the degradation issues of pure rubber particle sealing.
Solution Approach 2:
The sealing component features a curved or domed surface that conforms to the liquid injection hole opening, providing consistent contact pressure and maintaining sealing effectiveness over time. This curved geometry distributes stress evenly and prevents the sealing degradation that occurs with flat or irregular sealing materials.
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 provides a simple, effective sealing process that prevents electrolyte leakage, maintains sealing integrity over time, and reduces safety hazards by eliminating the need for welding, thus enhancing battery safety.
Implementation Method 1
a surface of the external thread of the connecting part and/or the threaded hole is provided with a first adhesive layer
Data Source
AI summary
The present application provides a battery cover plate and a battery. The battery cover plate includes a cover plate body, a first seal, a second seal, and a sealing ring. The cover plate body is provided with a liquid injection hole, the first seal is attached to a hole wall of the liquid injection hole and is provided with a threaded hole extending along an axis direction of the liquid injection hole. The second seal includes a head and a connecting part, a diameter of the head is greater than a diameter of the connecting part, a first step surface is defined between the head and the connecting part, the connecting part is provided with an external thread threadedly connected to the threaded hole. The sealing ring is sleeved on the connecting part and located between the first step surface and an upper surface of the cover plate body.