APPARATUS FOR CONTROLLING LITHIUM ION SECONDARY BATTERY AND METHOD FOR CONTROLLING LITHIUM ION SECONDARY BATTERY

To provide a technique for accurately estimating the precipitation state of lithium on a lithium ion secondary battery negative electrode.SOLUTION: An apparatus for controlling a lithium ion secondary battery includes: a secondary battery having a negative electrode including a negative electrode active material with which lithium ions are inserted and desorbed; and a controller calculating a negative electrode potential indicating the potential of the negative electrode with respect to a reference potential. The controller includes a map to obtain a negative electrode potential on the basis of a negative electrode SOC, the map being determined based on a SOC value at the start of charging/discharging and the value of a charge/discharge rate. The controller obtains the negative electrode potential based on a negative electrode SOC, by the map determined based on a SOC value at the start of charging/discharging and the value of a charge/discharge rate, and controls such that the negative electrode potential dose not fall below a threshold.SELECTED DRAWING: Figure 15 【課題】リチウムイオン二次電池の負極のリチウムの析出状態を正確に推定すること。【解決手段】リチウムイオン二次電池の制御装置は、リチウムイオンが挿入および脱離される負極活物質を含む負極を有する二次電池と、基準電位に対する前記負極の電位を示す負極電位を算出する制御装置とを備え、前記制御装置は負極電位を負極ＳＯＣに基づいて求めるマップを備え、当該マップは、充放電開始のＳＯＣの値と、充放電のレートの値に基づいて決定され、前記制御装置は、充放電開始のＳＯＣの値と、充放電のレートの値に基づいて、決定された前記マップに基づいて、前記負極電位を負極ＳＯＣに基づいて求め、前記負極電位が閾値未満にならないように制御する。【選択図】図１５