ELECTRICITY STORAGE SYSTEM

• Main Authors: KAIYA HIROYUKI, NISHI YUJI, ITO MOTOI, KAITA KEIJI, TANABE YUKINARI, TANAKA HIROMASA
• Format: Patent
• Language: English
• Published: 05.08.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention provides a configuration for cutting off the supply of electricity to an electricity storage block without interposing a controller. An electricity storage system has: an electricity storage block including electricity storage elements (11) for performing charging and discharging operations; relays (SMR-B, SMR-G) that switch between an on-state and an off-state, the on-state connecting the electricity storage block to loads (22, 23), the off-state cutting off the connection between the electricity storage block and the loads; a controller (34) for controlling the on- and off-states of the relays; and a current cut-off circuit (60) for switching the relays from the on-state to the off-state to cut off the supply of electricity to the electricity storage block. The current cut-off circuit has: alarm circuits (CMP, 62, 63) for comparing the voltage value of the electricity storage block with a threshold value and outputting an alarm signal indicating that the electricity storage block is in an overcharged state; a latch circuit (64) for holding the alarm signal; and a transistor (68) for receiving the output signal of the latch circuit and switching the relays from the on-state to the off-state.