POWER SUPPLY SYSTEM

• Main Author: TERASHIMA DAIKI
• Format: Patent
• Language: English; Japanese
• Published: 14.09.2017
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

PROBLEM TO BE SOLVED: To make dischargeable power of a secondary battery sufficiently usable and to suppress deterioration of the secondary battery caused by overdischarge in a simple configuration.SOLUTION: The present invention relates to a power supply system 100 comprising: a battery module 10 in which battery cells 11 are connected in series; a voltage sensor 17; a current sensor 18; a temperature sensor 19; and a control section 20. Based on a present voltage value Vb0, a present current value Ib0 and a present temperature Tb0 of the battery module 10, the control section 20 estimates a present positive electrode potential Vand a present negative electrode potential Vof the battery cell 11 and sets smaller power between first maximum dischargeable power of the battery module 10 calculated from the estimated current positive electrode potential Vand a discharge lower limit potential Vof a positive electrode and second maximum dischargeable power of the battery module 10 calculated from the estimated present negative electrode potential Vand a discharge upper limit potential Vof a negative electrode as maximum dischargeable power of the battery module 10.SELECTED DRAWING: Figure 5 【課題】簡便な構成で二次電池の放電可能電力を十分に使用可能とするとともに過放電による二次電池の劣化を抑制する。【解決手段】電池セル１１を直列に接続したバッテリモジュール１０と、電圧センサ１７と、電流センサ１８と、温度センサ１９と、制御部２０とを備える電源システム１００であって、制御部２０が、バッテリモジュール１０の現在電圧値Ｖｂ０と、現在電流値Ｉｂ０と、現在温度Ｔｂ０とに基づいて電池セル１１の現在正極電位Ｖ正０と現在負極電位Ｖ負０とを推定し、推定した現在正極電位Ｖ正０と正極の放電下限電位Ｖ正ｅとから算出したバッテリモジュール１０の第１最大放電可能電力と、推定した現在負極電位Ｖ負０と負極の放電上限電位Ｖ負ｅとから算出したバッテリモジュール１０の第２最大放電可能電力とのうちの小さい方をバッテリモジュール１０の最大放電可能電力として設定する。【選択図】図５