| 摘要 |
<p>Electricity storage device (11) of high reliability is provided which can determine abnormality of at least one of DC/DC converter (21) and electricity storage unit (27). There are DC/DC converter (21) connected to electricity storage unit (27) and control circuit (35) controlling DC/DC converter (21). When electricity storage unit (27) is being charged or discharged, control circuit (35) obtains efficiency Efn of DC/DC converter (21) based on input/output voltage value Vi, input/output current value I and electricity storage unit voltage value Vc detected by input/output voltage detection circuit (19), input/output current detection circuit (17), and electricity storage unit voltage detection circuit (29), respectively. By using temperature T detected by temperature sensor (31), when efficiency Efn lies out of predetermined range (from Emin to Emax) according to input/output voltage value Vi, input/output current value I, electricity storage unit voltage value Vc and temperature T, at least any one of electricity storage unit (27) and DC/DC converter (21) is determined to be abnormal.</p> |
