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US 6,468,692 B1Granted
Lithium secondary battery with sealed casing members
AssigneeNGK Insulators, Ltd.
InventorsHiroshi Nemoto, Shinji Ohtubo, Toshihiro Yoshida
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Abstract
A lithium secondary battery contains an electrode body obtained by winding a positive electrode and a negative electrode via a separator, a non-aqueous electrolytic solution, and a battery case accommodating the electrode body and the non-aqueous electrolytic solution. A lid and a metal foil are adhered to each other with a resin to form a pressure-releasing valve and make air-tight the inside of the battery case. This secondary battery is easy to produce and has excellent operational safety and excellent reliability.
Claims23
A lithium secondary battery comprising:
- an electrode body obtained by winding or laminating a positive electrode and a negative electrode via a separator,
- a non-aqueous electrolytic solution,
- at least one lid, and
- a battery case accommodating the electrode body and the non-aqueous electrolytic solution, wherein:
- (1) an elastomer is positioned between two or more members and said members are pressure-welded to each other, or
- (2) a resin is positioned between two or more members and the two or more members are pressure-welded to each other,
- and thereby the battery case has a seal between said two or more members,
- wherein the deformation of the elastomer in the load direction is larger than the spring-back amount of the pressure-welded portion and the stress applied to the elastomer is not smaller than 980 kPa and not larger than a level at which the retention of elasticity of the elastomer becomes 95%.
5 more elements
Dependencies are inferred from the claim text.