Apparatus of Estimating Power of Secondary Battery including Blended Cathode Material and Method the

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The present invention discloses an apparatus for estimating power of a secondary battery including a blended cathode material and a method thereof. The apparatus includes : a sensor for measuring a discharge current of a secondary battery including a cathode including a blended cathode material in which at least one first cathode material and a second cathode material (here, an operating voltage range of the first cathode material is higher than that of the second cathode material), an anode, and a separation film; and a control unit determining estimating a charging state of the secondary battery and discharging voltage of the secondary battery by using ′ a first resistance as a predetermined value′ corresponding to the charging state in a first condition in which the discharge current is less than a critical current and ′ a second resistance as a predetermined value′ corresponding to the charging state in a second condition in which the discharge current is greater than the critical current, thereby determining an output value of the secondary battery from the determined discharge voltage and the measure discharge current.(AA) Start(BB) Second condition(CC) First condition(DD) End(S10) Execute control logic(S100, S140) Determine secondary battery power(S110, S150) Store/display/transfer power(S120) Determine second voltage variation(S130) Determine discharge voltage (V_dis2)(S20) Power estimation condition is established?(S30) Measure discharge current L_dis(S40) Estimate charging state(S50) Determine critical current I^*(S60) Determine first and second resistance(S80) Determine first voltage variation(S90) Determine discharge voltage (V_dis1)COPYRIGHT KIPO 2014