US 8,942,075 B2Granted

Battery management device, battery apparatus, disk array apparatus and battery management method

AssigneeNEC Corporation

InventorYutaka Yoda

Life of this patent

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Abstract

Disclosed is a battery management device 1 and the like that maintains each secondary battery (SB) 2 in an appropriate state. The battery management device 1 calculates a degradation state of no smaller than the three SB 2 to be managed separately, selects, as the new power source, one of the SB 2 that have not been selected as a power source among a plurality of the SB 2 as management objects based on the degradation state, selects one of the plurality of the SB 2 that have been selected as the power source based on the degradation state and removing it from the power source, changes a combination of a plurality of the secondary batteries as the power source based on the degradation state, and activates the SB 2 disconnected from the power source by discharging and charging the SB 2.

Claims11

Dependent claims

A battery management device, comprising:

a charging circuit to charge a secondary battery;
a discharging circuit to discharge the secondary battery;
a path switching circuit including a function to switchably connect no smaller than three secondary batteries to be managed with one of the charging circuit and the discharging circuit separately, and a function to connect a plurality of the secondary batteries selected as a power source among the secondary batteries to be managed such that the secondary batteries selected as a power source are in a specific connection state;
an information collection unit to collect at least one of information indicating a charging situation about the secondary battery connected to the charging circuit via the path switching circuit, and information indicating a discharging situation about the secondary battery connected to the discharging circuit via the path switching circuit as battery status information;
and
a controller to calculate a degradation state of each of the secondary batteries as a management objects based on the battery status information, and manage each of the secondary batteries as management objects based on the calculated degradation state,
wherein the controller includes:
a function to select the plurality of the secondary batteries as the power source by using the degradation state,
a reorganization function to make one of the secondary batteries not selected as the power source be a new power source as substitute for one of the secondary batteries selected based on the degradation state among the secondary batteries having been selected as the power source,
a refreshing function to activate the secondary battery having been disconnected from the power source by the reorganization function using the discharging circuit and the charging circuit, and
a function to control the path switching circuit according to a prescribed control procedure.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/846,115Filed 18 Mar 2013
Priority: JP 2012-07179027 Mar 2012
Published: US 2013/0258830 A13 Oct 2013
Granted: 27 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02J 7/865
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: battery or charger load switching, e.g.…
G11B 27/36
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel: monitoring, i.e. supervising the progress of recording…
H02J
Power supply and charging
G11B
Information storage based on relative movement between record carrier and transducer