Battery control device and battery system

A battery control device of a battery system includes: a first calculation unit that calculates a first state of charge of a battery by a first method on the basis of a current value, a voltage value, and an internal resistance value of the battery; a second calculation unit that calculates a second state of charge of the battery using a second method different from the first method; and a correction unit that corrects the internal resistance value. When a difference greater than or equal to a predetermined value is detected between the first charging state and the second charging state, the correction unit corrects the internal resistance value by a resistance correction amount corresponding to the difference and the current value. 电池系统的电池控制装置包括：第1运算部，基于电池的电流值、电压值及内部电阻值，用第1方法运算电池的第1充电状态；第2运算部，用与第1方法不同的第2方法运算电池的第2充电状态；以及修正部，对内部电阻值进行修正。修正部在第1充电状态与第2充电状态之间检测到规定值以上的差分的情况下，用与差分和电流值相应的电阻修正量对内部电阻值进行修正。