Sealed secondary battery and manufacturing method therefor
AssigneeKabushiki Kaisha Toshiba
InventorsKenta Fukatsu, Tomohiro Matsui, Tatsuya Nishi
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Abstract
According to one embodiment, a sealed secondary battery is provided with a container body having an opening and accommodating an electrode assembly and an electrolyte, a sealing plate which seals the opening of the container body, the sealing plate having an injection hole which is formed penetrating the sealing. plate and through which the electrolyte is injected into the container body, and a sealing body positioned with an annular vacant space above a surface region of the sealing plate around the injection hole therein and welded at a peripheral edge portion thereof to the sealing plate, thereby sealing the injection hole.
Claims5
A sealed secondary battery comprising:
- a container body comprising an opening and accommodating an electrode assembly and an electrolyte;
- a sealing plate which seals the opening of the container body, the sealing plate comprising an injection hole which is formed penetrating the sealing plate and through which the electrolyte is injected into the container body;
- and
- a sealing body positioned with an annular vacant space above a surface region of the sealing plate around the injection hole therein and welded at a peripheral edge portion thereof to the sealing plate, thereby sealing the injection hole.
A manufacturing method for a sealed secondary battery, which comprises a container body comprising an opening and accommodating an electrode assembly and an electrolyte, a sealing plate which seals the opening of the container body, the sealing plate comprising an injection hole which is formed penetrating the sealing plate and through which the electrolyte is injected into the container body, and a sealing body configured to seal the injection hole, the method comprising:
- sealing the opening of the container body, in which the electrode assembly is accommodated, with the sealing plate and then injecting the electrolyte into the container body through the injection hole formed in the sealing plate;
- placing the sealing body on a surface region of the sealing plate around the injection hole therein with an annular vacant space thereabove after the electrolyte is injected;
- decompressing the container body on which the sealing body is placed;
- and
- welding a peripheral edge portion of the sealing body to the sealing plate, thereby sealing the injection hole, after the decompression.
Dependencies are inferred from the claim text.