Abstract: A battery pack includes a plurality of batteries, each including a battery element formed by winding or stacking a positive electrode and a negative electrode with a separator therebetween, and a packaging material packaging the battery element; a connecting member that electrically connects the batteries to form a battery group; a holding unit that holds the batteries together; a protection circuit substrate connected to the battery group; and an outer packaging member that integrally covers the battery group and the protection circuit substrate, the outer packaging member being formed by filling a space in a molding die housing the battery group and the protection circuit substrate with a resin and curing the resin at a temperature of 100° C. or less.

Abstract: Objects of the invention are to provide an ion-conductive polymer electrolyte for electrochemical device which has low volatility, is excellent in moldability and processability, has high compressive strength, has satisfactory ionic conductivity in a wide temperature range from ordinary to high temperatures, and has satisfactory chemical stability in high-temperature environments and to provide a secondary battery which employs the electrolyte and which has a practically sufficient output in a wide temperature range and has satisfactory safety and reliability in high-temperature environments. The polymer electrolyte for electrochemical device of the invention and the secondary battery employing the electrolyte include a polymer of a polymerizable boron-containing compound represented by formula (1), a high-molecular compound represented by formula (2), and an electrolyte salt.

Abstract: This invention provides a high-power secondary battery using a polymer electrolyte, a positive electrode, and a negative electrode. Such secondary battery comprises a positive electrode comprising a positive electrode active material that deintercalates and intercalates cations, a negative electrode comprising a negative electrode active material that intercalates and deintercalates cations deintercalated from the positive electrode, and an electrolytic layer comprising an ion conductive polymer that mediates between the positive electrode and the negative electrode and allows the cations to migrate, wherein the positive or negative electrode comprises an organic boron-containing compound as a binder component and the positive and/or negative electrode active material is treated with silane or aluminum.