METHOD FOR INSPECTING NICKEL-HYDROGEN STORAGE BATTERY

To provide a method for inspecting a nickel-hydrogen storage battery that nondestructively estimates the generated amount of Ni2O3H that incurs a decrease in capacity and assesses the reuse of the nickel-hydrogen storage battery.SOLUTION: Provided is a method for inspecting a nickel-hydrogen storage battery having a cathode whose active material is nickel hydroxide, an anode that includes a hydrogen-storing alloy, and an electrolyte which is composed of an alkaline aqueous solution. This inspection method comprises: a charge-discharge step (S2) for charging and discharging a target battery at a set rate and acquiring a charge-discharge curve; a Q/dV conversion step (S3) for converting the charge-discharge curve to a dQ/dV curve; a damage index calculation step (S4) for adding the absolute value of a maximum peak at charge time and the absolute value of a minimum peak at discharge time in the dQ/dV curve and thereby calculating a damage index; and a determination step (S5) in which it is determined that the battery is acceptable when the damage index is greater than or equal to a given threshold, and it is determined that the battery is unacceptable when the damage index is less than the threshold.SELECTED DRAWING: Figure 3 【課題】ニッケル水素蓄電池の検査方法が解決しようとする課題は、容量低下を招くＮｉ２Ｏ３Ｈの生成量を非破壊で推定し、ニッケル水素蓄電池の再利用の判定をすること。【解決手段】水酸化ニッケルを活物質とする正極、水素吸蔵合金を含む負極、及びアルカリ水溶液からなる電解液を有するニッケル水素蓄電池の検査方法において、設定したレートで対象電池を充放電し充放電カーブを取得する充放電のステップ（Ｓ２）と、充放電カーブをｄＱ／ｄＶカーブに置換するＱ／ｄＶ化のステップ（Ｓ３）と、ｄＱ／ｄＶカーブにおいて充電時の最大ピークに放電時の最小ピークの絶対値を加算することでダメージ指標を算出するダメージ指標算出のステップ（Ｓ４）と、ダメージ指標がある一定の閾値以上の場合は良品と判定し、前記閾値未満の場合は不良品と判定する、判定のステップ（Ｓ５）とを備える。【選択図】図３