ELECTRIC STORAGE DEVICE AND POWER ROUTE SWITCHING DEVICE

摘要

The present invention obtains high credibility by improving determination accuracy for opening and closing charge-discharge routes or power routes when protecting electric storage devices, etc. An electric storage device (1) comprises: a lithium ion secondary battery (20); battery side voltage measuring part (11) and charge-discharge side voltage measuring part (12) for measuring the potential difference between random two spots on the charge-discharge route of the lithium ion secondary battery (20); a current measuring part (17) for measuring currents on the charge-discharge route of the lithium ion secondary battery (20); a latching relay (30) installed between the two spots on the charge-discharge route; an opening-closing control part (14) for operating the latching relay (30); an operation determining part (15) for determining the operation state of the latching relay (30) based on the control state of the opening-closing control part (14), and at least one measurement from the current measuring part (17), the battery side voltage measuring part (11) and charge-discharge side voltage measuring part (12). [Reference numerals] (1) Electric storage device; (10) Protection circuit; (11) Battery-side voltage measuring part; (12) Charge-discharge-side voltage measuring part; (13) Current measuring part; (14) Opening and closing control part; (15) Driving determining part; (16) Driving history memorizing part; (17) Current measuring part; (20) Lithium ion secondary battery; (30) Latching relay; (40) Thermistor; (50) External access terminal