NICKEL-HYDROGEN STORAGE BATTERY

摘要

A nickel-metal hydride storage battery is provided capable of suppressing changes in discharge reserve and charge reserve of a negative electrode to prevent lowering of battery characteristics for a long term. A nickel-metal hydride storage battery 100 of the present invention comprises a battery main part (an electrode plate group 150, an electrolyte, and others), a case 102 housing this battery main part, and a safety valve device 101. The safety valve device 101 includes a valve member 110 of a closed-end substantially cylindrical shape. This nickel-metal hydride storage battery 100 is arranged such that a hydrogen leak rate V1 (µl/h/Ah) of the battery having been charged and discharged and then charged to 60% SOC satisfies a relationship: 2 ‰ V1‰ 4, the hydrogen leak rate being per unit of battery capacity under an atmosphere at a battery temperature of 45°C, and a reduced pressure of 10 kPa.