Button Cell Sealing Structure with Interlocking Grooves
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Solution Overview
Problem
Conventional button-type lithium cells face challenges in sealing due to small machining accuracy, leading to damage of the sealing ring and liquid leakage, as the circular arc grooves are difficult to machine accurately and result in the sealing ring being easily broken during the sealing process.
Innovation Solution
A structure and method for sealing the button-type lithium cell that includes a cell cover with an overlapping structure and a cell casing with a sealing structure, both featuring conical and cylindrical side structures that interlock with the sealing ring, preventing damage and enhancing the sealing performance by increasing the contact area and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circular arc grooves with small radius are used for sealing, then sealing tightness is improved, but machining accuracy becomes difficult to guarantee and the sealing ring is easily damaged
Solution Approach 1:
The patent changes the geometric parameters of the sealing structure by replacing small-radius circular arc grooves with large-radius circular arc grooves. This parameter change allows for easier and more accurate machining while maintaining effective sealing through the coordinated design of the sealing ring and groove dimensions
Solution Approach 2:
The patent employs circular arc grooves with optimized radius to create a curved sealing interface. The large-radius circular arc geometry provides better machining accuracy compared to small-radius curves, while the curved shape still effectively distributes sealing pressure and prevents liquid leakage
2Reliability
If circular arc grooves with small radius are used, then sealing contact is improved, but the sealing ring is easily broken during rotation sealing
Solution Approach 1:
The patent modifies the geometric parameters by using large-radius circular arc grooves instead of small-radius grooves. This change reduces stress concentration on the sealing ring during rotation, preventing breakage while maintaining adequate sealing contact through optimized groove depth and angle
Solution Approach 2:
The patent designs the sealing structure with sufficient groove depth and appropriate radial dimensions to provide a cushioning effect that absorbs sealing forces before they can damage the sealing ring. The structural design anticipates and prevents sealing ring failure during the rotation sealing process
3Measurement precision
If small-radius circular arc grooves are machined, then sealing precision is improved, but overall manufacturing complexity increases
Solution Approach 1:
The patent simplifies manufacturing by changing the groove radius parameter from small to large values. Large-radius grooves are significantly easier to machine with standard equipment, reducing manufacturing complexity while the coordinated design parameters maintain the required sealing precision
Data Source
AI summary
A structure for sealing a button-type lithium cell includes a cell cover, a sealing ring and a cell casing. The cell cover includes an overlapping structure. The overlapping structure includes a first overlapping portion, a second overlapping portion and a third overlapping portion and the third overlapping portion includes a locking portion and a sealing portion. The cell casing includes a sealing structure. The sealing structure includes a first sealing portion, a second sealing portion, a third sealing portion and a fourth sealing portion. The first overlapping portion abuts against the fourth sealing portion through the sealing ring, the second overlapping portion abuts against the third sealing edge through the sealing ring, the locking portion of the third overlapping portion abuts against the second sealing edge through the sealing ring, and the sealing portion of the third overlapping portion abuts against the first sealing edge through the sealing ring.