Cylindrical Battery Cell Gasket Integration for Sealing and Insulation
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Solution Overview
Problem
Existing cylindrical lithium secondary batteries face challenges in maximizing capacity and efficiency due to the need for separate insulating plates, which can lead to short circuits and electrolyte leakage, complicating assembly and increasing production time.
Innovation Solution
A battery cell design integrates an insulating gasket with airtightness maintenance and insulating parts, eliminating the need for additional insulating plates, ensuring airtightness and preventing short circuits while allowing for increased internal capacity and streamlined assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate insulating plates are used to prevent short circuits, then reliability is improved, but device complexity increases and manufacturing time increases
Solution Approach 1:
The patent combines the insulating plate function and gasket function into a single integrated component. The gasket includes both an insulating part (to prevent short circuits between electrodes) and an airtightness maintenance part (to seal the battery case), eliminating the need for separate insulating plates and reducing component count while maintaining reliability
2Reliability
If separate insulating plates are used to prevent short circuits, then reliability is improved, but manufacturing time increases
Solution Approach 1:
By integrating the insulating function and airtightness function into one gasket component, the number of assembly steps is reduced. The gasket is installed in a single operation that simultaneously provides both insulation and sealing, eliminating the need for separate installation of insulating plates and improving manufacturing efficiency
3Reliability
If additional insulating plates are added to prevent short circuits, then reliability is improved, but the internal space of the case decreases
Solution Approach 1:
The integrated gasket design combines multiple functions (insulation, airtightness, electrode separation) into a single component that occupies minimal space. This eliminates the need for additional thick insulating plates, thereby maximizing the internal capacity of the battery case while maintaining all necessary safety and sealing functions
4Reliability
If multiple separate components are used for airtightness and insulation, then reliability is improved, but ease of manufacture decreases
Solution Approach 1:
The gasket is designed as an integrated component where the insulating part and airtightness maintenance part are formed as one piece. This simplifies the manufacturing process by reducing the number of parts to be produced, stored, and assembled, while maintaining both sealing and insulation functions simultaneously
Solution Approach 2:
The gasket serves multiple functions simultaneously: it provides airtightness sealing against the case, provides electrical insulation between positive and negative electrodes, and maintains structural integrity. This multi-functionality in a single component simplifies manufacturing and assembly operations
Data Source
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AI summary
A battery cell and a method of manufacturing the battery cell are disclosed. A battery cell includes an electrode assembly including a first electrode plate and a second electrode plate, a case in which the electrode assembly is accommodated, a cap assembly covering an open area of the case, and a gasket located between an upper portion of the electrode assembly and the cap assembly and located in close contact with the case.