Method of fabricating flat type electrochemical device
First Claim
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1. A method of fabricating a flat type electrochemical device, comprising the steps of:
- (a) assembling a flat type electrochemical device, said electrochemical device comprising first and second case half bodies each having respective peripheral portions, the respective peripheral portions being overlapped with each other to form a containing space in between the corresponding case half bodies;
at least a separator and first and second functional substances for an electrochemical device being contained in said containing space arranged so as to interpose said separator between said first and second functional substances;
(b) welding said respective overlapped peripheral portions of said first and second case half bodies by a welding process, said welding process comprising the steps of applying pressure to said respective overlapped peripheral portions during said welding process whereby said respective overlapped peripheral portions of said first and second case half bodies are joined with substantially no gap therebetween; and
then,(c) laser beam welding said respective overlapped peripheral portions welded in step (b) to hermetically seal said containing space.
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Abstract
A method of fabricating a flat type electrochemical device, which is constructed by placing in a case comprising first and second case half bodies a separator and first and second functional substances for an electrochemical device so arranged as to interpose the separator. Peripheral portions of the first and second case half bodies are overlapped with each other, the peripheral portions are welded by a welding process during the application of pressure whereby the peripheral portions are joined with substantially no gaps. The portions welded by the welding process with pressure are then further welded using a laser beam welding.
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Citations
8 Claims
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1. A method of fabricating a flat type electrochemical device, comprising the steps of:
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(a) assembling a flat type electrochemical device, said electrochemical device comprising first and second case half bodies each having respective peripheral portions, the respective peripheral portions being overlapped with each other to form a containing space in between the corresponding case half bodies;
at least a separator and first and second functional substances for an electrochemical device being contained in said containing space arranged so as to interpose said separator between said first and second functional substances;(b) welding said respective overlapped peripheral portions of said first and second case half bodies by a welding process, said welding process comprising the steps of applying pressure to said respective overlapped peripheral portions during said welding process whereby said respective overlapped peripheral portions of said first and second case half bodies are joined with substantially no gap therebetween; and
then,(c) laser beam welding said respective overlapped peripheral portions welded in step (b) to hermetically seal said containing space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification