A battery apparatus comprising: a row battery group including a plurality of series-connected row batteries (50a, 50b, 50c) including one or more battery cells; a plurality of battery management means (10a, 10b, 10c), corresponding to the individual row batteries, configured to manage the battery statuses of the corresponding row batteries; central management means configured to grant unique identification information to the individual battery management means (10a, 10b, 10c) and configured to acquire information about the battery statuses of the row batteries from the respective battery management means (10a, 10b, 10c) for management; second communication lines with which the plurality of battery management means (10a, 10b, 10c) are daisy-chained; and a first communication line with which, of the plurality of battery management means (10a, 10b, 10c), the battery management means located at one end is connected to the central management means; characterized by a plurality of connection switching means (60a, 60b, 60c), provided in the individual second communication lines between the battery management means (10a, 10b, 10c), configured to switch the connection and disconnection between the battery management means (10a, 10b, 10c) and the central management means; wherein each battery management means (10a, 10b, 10c) is configured to turn off its connection switching means (60a, 60b, 60c) in an initial state [see section]; and each of the battery management means (10a, 10b, 10c), upon determination of identification information thereof through communication with the central management means, is configured to store the determined identification information and configured to turn on the connection switching means (60a, 60b, 60c) between the battery management means (10a, 10b, 10c) and another battery management means (10b, 10c) located immediately downstream thereof to enable the another battery management means (10b, 10c) to communicate with the central management means. a row battery group including a plurality of series-connected row batteries (50a, 50b, 50c) including one or more battery cells; a plurality of battery management means (10a, 10b, 10c), corresponding to the individual row batteries, configured to manage the battery statuses of the corresponding row batteries; central management means configured to grant unique identification information to the individual battery management means (10a, 10b, 10c) and configured to acquire information about the battery statuses of the row batteries from the respective battery management means (10a, 10b, 10c) for management; second communication lines with which the plurality of battery management means (10a, 10b, 10c) are daisy-chained; and a first communication line with which, of the plurality of battery management means (10a, 10b, 10c), the battery management means located at one end is connected to the central management means; a plurality of connection switching means (60a, 60b, 60c), provided in the individual second communication lines between the battery management means (10a, 10b, 10c), configured to switch the connection and disconnection between the battery management means (10a, 10b, 10c) and the central management means; wherein each battery management means (10a, 10b, 10c) is configured to turn off its connection switching means (60a, 60b, 60c) in an initial state [see section]; and each of the battery management means (10a, 10b, 10c), upon determination of identification information thereof through communication with the central management means, is configured to store the determined identification information and configured to turn on the connection switching means (60a, 60b, 60c) between the battery management means (10a, 10b, 10c) and another battery management means (10b, 10c) located immediately downstream thereof to enable the another battery management means (10b, 10c) to communicate with the central management means.