FUEL CELL SYSTEM

• Main Author: OURA JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 12.10.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a technique capable of improving a power generation efficiency of a fuel cell in a fuel cell system.SOLUTION: A fuel cell system comprises: a fuel cell; a voltage rising converter; a secondary battery; and a control device. A power generation efficiency map writes a relationship between a net output power and a power generation efficiency. The control device is constructed so that a map updating processing is executed, including: a first processing; a second processing; and a third processing in a predetermined frequency. In the first processing, the relationship between the net output power and the power generation efficiency of the fuel cell is actually measured while changing the net output power of the fuel cell in a range where the secondary battery is discharged in a permission discharge amount or less. In the second processing, the relationship between the net output power and the power generation efficiency of the fuel cell is actually measured while changing the net output power of the fuel cell in a range where the secondary battery is charged in a permission charging amount or less. In the third processing, the power generation efficiency map is updated by using the relationship actually measured in the first processing and the second processing when a predetermined condition is satisfied.SELECTED DRAWING: Figure 3 【課題】燃料電池システムにおいて、燃料電池の発電効率を向上するための技術を提供する。【解決手段】燃料電池システムは、燃料電池と、昇圧コンバータと、二次電池と、制御装置とを備える。発電効率マップは、正味出力電力と発電効率との関係を記述している。制御装置は、所定の頻度において、第１の処理、第２の処理、及び第３の処理を含む、マップ更新処理を実行するように構成されている。第１処理では、二次電池が許容放電電力以下で放電する範囲内で燃料電池の正味出力電力を変化させながら、燃料電池の正味出力電力と発電効率との関係が実測される。第２処理では、二次電池が許容充電電力以下で充電される範囲内で燃料電池の正味出力電力を変化させながら、燃料電池の正味出力電力と発電効率との関係が実測される。第３処理では、所定の条件が満たされるときに、第１処理又は第２処理で実測された関係を用いて、発電効率マップが更新される。【選択図】図３