VOLTAGE CONTROL DEVICE FOR POWER STORAGE MODULE, AND VOLTAGE CONTROL METHOD

• Main Authors: KATAOKA TOMOMI, YAMAGUCHI YOHEI, KONO KEIICHI, MATSUURA TAKAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 22.12.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To more effectively utilize capacitance that a power storage module has originally.SOLUTION: A voltage control device for a power storage module comprises: a power storage module including (n) (2≤n) pieces of power storage elements B(i) ((i) is an integer from 1 to (n)) that are connected in series; a first control part which controls a voltage of the power storage module equal to or higher than a use lower limit voltage Vuse-ud and equal to or lower than a use upper limit voltage Vuse-up; a second control part which individually controls a voltage of each of the (n) pieces of power storage elements B(i) equal to or higher than an operation guarantee lower limit voltage Vm-ud and equal to or lower than an operation guarantee upper limit voltage Vm-up; a calculation part which individually calculates a preset voltage Vs(i)(Vm≠Vs(i)) of each of the (n) pieces of power storage elements B(i) based on an equalization target voltage Vm (Vm-ud≤Vm≤Vm-up); and a charge/discharge control part which individually charges or discharges at least a part of the (n) pieces of power storage elements B(i). The calculation part calculates Vs(i) in such a manner that the (n) pieces of power storage elements B(i) are equalized by Vm.SELECTED DRAWING: Figure 1 【課題】蓄電モジュールが本来備える容量を、より有効に活用する。【解決手段】直列に接続されたｎ個（２≦ｎ）の蓄電素子Ｂ（i）（iは１からｎの整数）を含む蓄電モジュールと、蓄電モジュールの電圧を使用下限電圧Ｖuse-ud以上、使用上限電圧Ｖuse-up以下に制御する第１制御部と、ｎ個の蓄電素子Ｂ（i）の電圧をそれぞれ個別に動作保障下限電圧Ｖm-ud以上、動作保障上限電圧Ｖm-up以下に制御する第２制御部と、均等化目標電圧Ｖｍ（ただし、Ｖm-ud≦Ｖｍ≦Ｖm-up）に基づいて、ｎ個の蓄電素子Ｂ（i）の設定電圧Ｖｓ（i）（ただし、Ｖｍ≠Ｖｓ（i））をそれぞれ個別に求める計算部と、Ｖｓ（i）に向けて、ｎ個の蓄電素子Ｂ（i）の少なくとも一部をそれぞれ個別に充電または放電する充放電制御部と、を具備し、計算部は、ｎ個の蓄電素子Ｂ（i）がＶｍで均等化されるようにＶｓ（i）を算出する、蓄電モジュールの電圧制御装置。【選択図】図１