Button Cell Sealing Structure for Electrolyte Injection Ports
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Solution Overview
Problem
Button cells in prior art suffer from inferior sealing performance due to electrolyte solution splashing during the riveting process of the conductive member, leading to partial failure of the sealant ring.
Innovation Solution
A conductive member covers the top cover opening through a sealant ring in an insulated and sealed manner, with the cell placed in a bottom shell cavity, and a first tab welded to the shell. The top cover is then connected to the shell in a sealed manner, and an electrolyte solution is injected through a liquid injection port, which is sealed with a sealing member, enhancing the sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the conductive member is riveted to the top cover opening, then the conductive member is securely fixed, but electrolyte solution splashes during the riveting process causing sealant ring failure
Solution Approach 1:
The sealant ring is pre-installed on the top cover opening before the conductive member is riveted. This preliminary action ensures the sealant ring is in position to prevent electrolyte solution splashing during the subsequent riveting process, thereby maintaining sealing performance while achieving secure fixation of the conductive member.
Solution Approach 2:
The sealant ring acts as a protective barrier installed beforehand to cushion against the harmful effect of electrolyte solution splashing during riveting. This beforehand cushioning prevents the splashing electrolyte from reaching and failing the sealant ring, thus preserving the sealing integrity while allowing the riveting process to proceed.
2Reliability
If the top cover is connected to the bottom shell in a sealed manner, then sealing performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The sealing structure is segmented into distinct components: the top cover, bottom shell, sealant ring, and sealing member. Each component has a specific sealing function, and they are assembled in a modular fashion. This segmentation allows for simpler individual component manufacturing while achieving reliable sealing through their coordinated assembly.
Solution Approach 2:
The sealing member acts as an intermediary component between the top cover and bottom shell. It provides the sealing function without requiring complex direct sealing mechanisms between the two main shells, thereby simplifying the overall manufacturing process while maintaining reliable sealing performance.
3Reliability
If a sealing member is added to cover the liquid injection port, then electrolyte leakage is prevented, but the device structure becomes more complex
Solution Approach 1:
The sealing member serves multiple functions: it covers the liquid injection port to prevent electrolyte leakage, provides a sealing surface for the injection port closure, and maintains the structural integrity of the top cover assembly. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity while achieving reliable leak prevention.
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 described structure improves the sealing performance of button cells by ensuring a reliable and sealed connection between components, preventing electrolyte leakage and maintaining the integrity of the cell.
Implementation Method 1
the top cover is connected to the bottom shell in a sealed manner
Implementation Method 2
the first tab being electrically connected to the case, and the second tab being electrically connected to the conductive member
Implementation Method 3
the liquid injection port being covered with a sealing member which is connected to the liquid injection port in a sealed manner
Data Source
AI summary
The present disclosure provides a button cell and an electronic device. The button cell includes a case, a cell, a conductive member arranged on the case and connected to the case in an insulated manner, and a liquid injection port for injecting an electrolyte solution into an accommodating cavity. A cell is placed in an accommodating cavity of a bottom shell. A first tab is welded to an inner bottom wall of the bottom shell, and then the top cover having the conductive member is connected to the bottom shell in a sealed manner, with a second tab on the cell being electrically connected to the conductive member. Finally, an electrolyte solution is injected into the accommodating cavity. After the electrolyte solution is injected, a sealing member covers the liquid injection port, and the sealing member is connected to the liquid injection port in a sealed manner.