HYDROGEN STORAGE ALLOY, HYDROGEN STORAGE ALLOY ELECTRODE, AND HERMETICALLY SEALED-TYPE NICKEL HYDROGEN STORAGE BATTERY

摘要

PPROBLEM TO BE SOLVED: To provide a hermetically sealed-type nickel hydrogen storage battery having excellent rapid charging performance. PSOLUTION: The hermetically sealed-type nickel hydrogen storage battery comprises a negative electrode with hydrogen storage alloy powder having an equilibrium hydrogen pressure of 0.005 to 0.05 MPa at 60C applied, comprising nickel and cobalt, and having a specific surface area of 0.1 to 5mSP2/SP/g, and a mass saturation magnetization of 1 to 10AmSP2/SP/kg, and in which the capacitance ratio between the positive electrode and the negative electrode (negative electrode capacitance/positive electrode capacitance) is 1.1. The capacitance ratio between the positive electrode and the negative electrode (negative electrode capacitance/positive electrode capacitance) is preferably 1.5, and a pressure switching function of making charge OFF at the time when the internal pressure of the battery increases to a prescribed value or higher is preferably provided thereon. PCOPYRIGHT: (C)2005,JPO&NCIPI