REDOX FLOW BATTERY AND CONTROL METHOD FOR REDOX FLOW BATTERY

• Main Authors: KURAZONO KOICHI, IWATA YASUSHI, FUKANO TATSUO
• Format: Patent
• Language: English; Japanese
• Published: 31.01.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To perform efficient charge/discharge while suppressing increase in volume and cost of a redox flow battery.SOLUTION: A redox flow battery comprises: a plurality of battery cells; an electrolyte tank storing an electrolyte therein; a pump circulating the electrolyte to the battery cells; a current acquisition unit for acquiring current values in the plurality of battery cells at the time of charge or discharge; a flow rate acquisition unit for acquiring a flow rate of the electrolyte flowing into at least one of the plurality of battery cells; an arithmetic unit for respectively calculating ion consumption to be consumed in each battery cell using the current value of the battery cell and the flow rate of the electrolyte and for calculating a residual ion concentration contained in the electrolyte within the electrolyte tank and the plurality of battery cells using the calculated ion consumption and a total ion concentration before starting the charge or discharge; and a control unit for controlling a voltage value of each battery cell at the time of charge or discharge equal to or lower than a predetermined voltage, using the residual ion concentration.SELECTED DRAWING: Figure 1 【課題】レドックスフロー電池の体積およびコストの増加を抑制した上で、効率的な充放電を可能にする。【解決手段】レドックスフロー電池は、複数の電池セルと、電解液を貯留している電解液タンクと、電解液を前記電池セルへと循環させるポンプと、複数の電池セルのそれぞれにおける充電時または放電時の電流値を取得する電流取得部と、複数の電池セルのうちの少なくとも１つに流入する電解液の流量を取得する流量取得部と、各電池セルの電流値と、電解液の流量とを用いて、電池セルで消費されるイオン消費量をそれぞれ算出し、算出された各イオン消費量と、充電または放電の開始前の総イオン濃度とを用いて、電解液タンク内と複数の電池セル内の電解液に含まれる残存イオン濃度を算出する演算部と、残存イオン濃度を用いて、各電池セルの充電時または放電時の電圧値を所定の電圧以下に制御する制御部と、を備える。【選択図】図１