Patent ID: 7999553
Filing Date: 2011-08-16
Classification: B60L,Y02T

Abstract:
1. A voltage measurement device for measuring an inter-terminal voltage of each of a serially connected plurality of battery blocks in battery block units, comprising: a plurality of potential detection lines respectively connected to both ends of the plurality of battery blocks and respective connection points between the respective battery blocks; a first multiplexer circuit for selectively connecting any of one of odd-numbered potential detection lines of the potential detection lines, counted from one end of the plurality of battery blocks, to a first potential detection terminal; a second multiplexer circuit for selectively connecting any one of even-numbered potential detection lines of the potential detection lines, counted from the one end, to a second potential detection terminal; a voltage detection unit for detecting the inter-terminal voltage of a measurement target battery block, and for detecting, only if the inter-terminal voltage of the measurement target battery block can not be detected, an integrated voltage of a battery block group comprising the plurality of battery blocks including the measurement target battery block, and calculating the inter-terminal voltage of the measurement target battery block based on a number of the battery blocks included in the battery block group and the integrated voltage; and a switch control unit that commands a first switch to close on an odd-numbered potential detection line and a second switch to close on an even-numbered potential detection line separated from the even-numbered potential detection line by at least three or more battery blocks to detect the integrated voltage of the three or more battery blocks.