Patent ID: 8329335

Claim:
A sealed-type nickel-metal hydride secondary battery, comprising: an integrated battery container in which a plurality of battery containers having a rectangular parallelepiped shape with a short-side surface having a narrow width, a long-side surface having a wide width, and an opening on an upper surface, are integrally connected with each other while sharing the short-side surfaces; and a top lid member which is adhered by heating and fusing to an upper surface of the integrated battery container, wherein the integrated battery container and the top lid member are made of a polymer alloy having a polyphenylene ether resin and a polyolefin resin as primary constituents, wherein the polymer alloy comprises 20% by weight to 80% by weight of the polyphenylene ether resin, a lateral lid member which is adhered through heating and fusing to a long-side surface of the integrated battery container is made of a polypropylene-based resin, wherein the polypropylene-based resin comprises approximately 100% by weight of either a single polypropylene polymer, a random co-polymer of propylene-ethylene, or a block co-polymer having a single polymer of propylene and a random co-polymer of propylene-ethylene, and the polypropylene-based resin is treated with a nucleating agent to increase a mechanical strength of the polypropylene-based resin to achieve thermal property values approximately the same as thermal property values of the polymer alloy, wherein the polypropylene-based resin of the lateral lid member has a melt flow rate MFR under a condition of 250° C. and a load condition of 98 N of 0.4 g/10 min˜1.3 g/10 min, and the MFR of the polypropylene-based resin is approximately the same degree as an MFR of the polymer alloy.