Patent ID: 10910668

Abstract:
A battery system 5 is provided with an all-solid-state battery 10, a voltage detection device that detects voltage of the all-solid-state battery, a current detection device 66 that detects current flowing from the all-solid-state battery, and a control device 50 that controls the all-solid-state battery. A negative electrode active material layer is composed of lithium metal. The control device calculates the amount of change in charging rate as a first estimated value, based on an integrated value obtained by integrating detected current over a prescribed calculation period, calculates the amount of change in charging rate as a second estimated value, based on voltage detected during the calculation period as a second estimated value, and judges that an abnormality has occurred in the all-solid-state battery when the difference between the first estimated value and the second estimated value is equal to or greater than a predetermined reference value.