| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a nickel hydrogen storage battery, and a battery system having means for detecting a state of charge of the nickel hydrogen storage battery or a depth of discharge thereof.SOLUTION: A nickel hydrogen storage battery according to an embodiment of the invention has an electrode group, and an alkaline electrolyte in an exterior can. The electrode group includes: a hydrogen-absorbable alloy negative electrode including, as a primary component, a hydrogen-absorbable alloy expressed by the general formula, LaReMgNiM(where Re represents at least one or more elements selected from rare earth elements (except La) including Y, and including at least Sm or Nd, and M represents at least one or more elements selected from Al, Co, Mn and Zn), provided that x/y is equal to or larger than 0.5; a nickel positive electrode including, as a primary component, nickel hydroxide; and a separator.</p> |
