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Development of Seal Technology for Electric Double-layer Capacitor Cover Using Aluminum-Resin Insert Mould Process

Article of Honda R&D Technical Review Vol.15 No.1


Electric double-layer capacitor covers are required to seal in organic liquid electrolytes, isolate positive and negative electrodes, and maintain pressure tightness. An insert mould process using chemically combined aluminum and resin and a rib to prevent resin shrinkage have been developed to enable these requirements to be met. In this process aluminum and resin are bonded by insert moulding after triazinedithiol electrocoating of the aluminum surface. Optimization of the formation of the triazinedithiol coat and insert mould conditions and the establishment of a rib between the aluminum and resin have enabled the production of covers which satisfy the requirements enumerated above after acceleration tests based on actual use conditions. The long-term sealing performance of the new covers has also been verified.


(1) Sasaki, H., Kobayashi, I., Sai, S., Omoto, T., Mori, K.: Direct Adhesion of Nylon Resin to Stainless Steel Plates Coated with Triazine Thiol Polymer by Electropolymerization during Injection-Molding, Kobunshi Ronbunshu, Vol. 55, No. 8, p. 470-476 (1998)

Author (organization or company)

Masato KOMATSUKI(Wako Research Center)、Kazuaki IGARASHI(Wako Research Center)、Toru OTA(Wako Research Center)、Norifumi YASUDA(Wako Research Center)

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