Secondary Battery Electrolyte Injection Unit Sealing Design
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Solution Overview
Problem
Existing secondary battery designs face challenges in effectively sealing the electrolyte injection hole and efficiently washing out residual electrolyte, leading to potential leaks and inefficiencies.
Innovation Solution
The design incorporates an injection ring with a funnel shape and a truncated conical stopper, where the injection ring is integrally formed with the cap plate and deforms to securely fit the stopper, ensuring a tight seal and facilitating easy removal of residual electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrolyte injection hole with a simple stopper is used, then the structure is simple and easy to manufacture, but the sealing performance is insufficient and residual electrolyte cannot be easily washed out
Solution Approach 1:
The injection hole structure is segmented into multiple functional components: an injection ring with distinct inner and outer circumferential surfaces, a stepped configuration with first and second surfaces, and a separately fitted stopper. This segmentation allows each component to perform its specific function optimally while maintaining overall sealing performance.
Solution Approach 2:
The injection hole structure extends in the vertical dimension with the injection ring protruding from the cap plate, creating a multi-level stepped structure. The first surface is positioned lower than the top surface of the cap plate, while the second surface connects to the top surface, creating vertical层次感 that enhances sealing and facilitates electrolyte drainage.
2Reliability
If the injection ring has the same thickness as the cap plate, then the structure is uniform and easy to manufacture, but the stopper cannot be securely fitted and sealing is compromised
Solution Approach 1:
The injection ring has non-uniform thickness distribution: the thickness between inner and outer circumferential surfaces is specifically made less than the cap plate thickness in certain regions. This local variation in quality provides the necessary clearance and deformation space for the stopper to be securely fitted, while maintaining adequate thickness in other areas for structural integrity.
3Reliability
If the injection ring protrudes significantly from the cap plate, then the stopper can be securely fitted, but the overall device height increases and compactness is reduced
Solution Approach 1:
The injection ring protrudes partially from the cap plate rather than fully or excessively. The first surface is positioned lower than the top surface of the cap plate, creating a stepped configuration that provides sufficient protrusion for secure stopper fitting while limiting the overall height increase to maintain compactness.
4Reliability
If a simple cylindrical injection hole is used, then residual electrolyte can be easily washed out, but sealing performance is insufficient
Solution Approach 1:
The injection ring and stopper are designed with predetermined geometric features (funnel shape, truncated conical shape, stepped surfaces) that create natural drainage pathways. This preliminary design ensures that residual electrolyte can be easily washed out through the structured configuration without requiring additional complex drainage mechanisms.
Data Source
AI summary
A secondary battery including an electrode assembly, a can accommodating the electrode assembly, a cap plate coupled to the can, an electrolyte injection unit including an injection hole penetrating the cap plate and an injection ring protruding from the injection hole, and a stopper to seal the electrolyte injection unit.