Patent Number: 6,297,618

Title: Power storage device and method of measuring voltage of storage battery

Abstract: A power storage device has a plurality of series-connected storage battery units, battery circuits associated with the storage battery units to control or monitor the storage battery units, respectively; a main circuit of a potential level different from that of the battery circuits; and a potential level changing circuits connecting the battery circuit to the main circuit. The power storage unit is small in construction and operates at a low power consumption in a high control accuracy.

Inventors: Emori; Akihiko (Hitachi, JP), Kinoshita; Takuya (Hitachi, JP), Miyazaki; Hideki (Hitachi, JP), Kojima; Yasuyuki (Hitachi, JP), Akiyama; Noboru (Hitachinaka, JP)

Assignee: Hitachi Ltd.

International Classification: G01R 31/36 (20060101); H02J 7/00 (20060101); H01M 010/44 (); H01M 010/46 ()

Expiration Date: 10/02/2018