BATTERY STATE DETECTION DEVICE, SECONDARY BATTERY SYSTEM, BATTERY STATE DETECTION PROGRAM, AND BATTERY STATE DETECTION METHOD

PROBLEM TO BE SOLVED: To highly accurately detect allowable current of a battery.SOLUTION: In an allowable current arithmetic unit 302, an allowable charging current determination unit 705 determines allowable charging current Imax_chg of a battery pack 110 according to the state of the battery pack 110 on the basis of at least one of allowable charging current Imax_chg1 from a first allowable current arithmetic unit 703 calculated on the basis of voltage of the battery pack 110 and allowable charging current Imax_chg2 from a second allowable current arithmetic unit 704 calculated without using the voltage of the battery pack 110. An allowable discharging current determination unit 706 determines allowable discharging current Imax_dis of the battery pack 110 on the basis of at least one of allowable discharging current Imax_dis1 from the first allowable current arithmetic unit 703 and allowable discharging current Imax_dis2 from the second allowable current arithmetic unit 704.SELECTED DRAWING: Figure 7 【課題】電池の許容電流を高精度に検知する。【解決手段】許容電流演算部３０２において、許容充電電流決定部７０５は、組電池１１０の電圧に基づいて求められた第一許容電流演算部７０３からの許容充電電流Ｉｍａｘ＿ｃｈｇ１と、組電池１１０の電圧を用いずに求められた第二許容電流演算部７０４からの許容充電電流Ｉｍａｘ＿ｃｈｇ２の少なくとも一つに基づいて、組電池１１０の状態に応じた組電池１１０の許容充電電流Ｉｍａｘ＿ｃｈｇを決定する。許容放電電流決定部７０６は、第一許容電流演算部７０３からの許容放電電流Ｉｍａｘ＿ｄｉｓ１と、第二許容電流演算部７０４からの許容放電電流Ｉｍａｘ＿ｄｉｓ２の少なくとも一つに基づいて、組電池１１０の許容放電電流Ｉｍａｘ＿ｄｉｓを決定する。【選択図】図７