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Leak-proof alkaline cell and its manufacture
| Details |
Inventors: Ishida, Osamu; Uetani, Yoshio; Matsushima, Seiichi;
Assignee: Hitachi Maxell, Ltd. (Osaka, JP)
Primary Examiner: LeFevour; Charles F.
Assistant Examiner:
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch
A leak-proof alkaline cell comprising a positive can and a negative electrode collector kept at the opening end of the positive can with intervention of a gasket so as to make the inside of the cell liquid-tight, characterized in that the gasket is made of an alkali resistant, elastic material and has a moisture content of not more than 0.3% by weight. |
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DETAILED DESCRIPTION What is claimed is: 1.
A leak-proof alkaline cell comprising a positive can and a negative electrode collector provided at the opening end of the positive can with intervention of a gasket so as to make the inside of the cell liquid-tight, characterized in that the gasket is made of a polyamide resin and has a moisture content of not more than 0.
3% by weight.
2.
The cell according to claim 1, wherein the polyamide resin is the polycondensation product of 11-aminoundecanoic acid.
3.
The cell according to claim 1 or 2, wherein the gasket is provided with a coating layer of a sealing material at the surface.
4.
The cell according to claim 3, wherein the sealing material is a member selected from the group consisting of pitch, fatty polyamides, rubbery adhesives and silicone oils.
5.
A leak-proof alkaline cell comprising a positive can and a negative electrode collector provided at the opening end of the positive can with intervention of a polyamide resin gasket so as to make the inside of the cell liquid-tight, characterized in that the gasket has a moisture content of not more than 0.
3% by weight on the assembly of the gasket into the cell.
6.
The cell according to claim 5, wherein the gasket is provided with a coating layer of a sealing material at the surface.
7.
The cell according to claim 6, wherein the positive can and the negative electrode collector are provided with a coating layer of a sealing material at the surface(s) which are brought into contact with the gasket.
Description:
The present invention relates to a leak-proof alkaline cell and its manufacture.
An alkaline cell is usually manufactured by admitting a positive depolarizing mix with a small amount of an electrolyte to a positive can, placing a separator on the positive depolarizing mix and fitting to the opening end of the positive can a negative electrode collector accommodating a negative electrode material mix and a large amount of an electrolyte therein with intervention of a gasket having an L-letter form section, followed by crimping the rim of the positive can inwardly so as to press the gasket to the negative electrode collector
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