Power control unit

• US 8,120,365 B2
• Filed: 02/23/2010
• Issued: 02/21/2012
• Est. Priority Date: 01/08/2003
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Emori, Akihiko, Toyota, Eiichi, Suzuki, Masato, Shimada, Motomi, Miyauchi, Tsutomu, Kinoshita, Takuya, Miyazaki, Hideki
• Primary Examiner(s): NGUYEN, HOAI AN D
• Application Number:
  US12/710,462
• Publication Number:
  US 20100148728A1
• Time in Patent Office: 728 Days
• Field of Search: 324/413, 324/410, 324426-428, 324430-434, 324/522, 324/678, 324/87, 324/382, 324/405, 324/403, 320/103, 320/104, 320/119, 320/126, 320/132, 320/134, 320/136, 320/106, 320/149
• US Class Current: 324/430
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 30/00 Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance

Abstract

A power control apparatus for controlling charging and discharging of a plurality of storage devices, including a voltage measuring device for measuring voltages of the storage devices, a current measuring device for measuring currents flowing through the storage devices, a status detecting device for detecting the operating status of each of the storage devices from values measured by the voltage measuring device and the current measuring device, and a charging/discharging controlling device for controlling currents, voltages, or power according to the operating status of each storage device detected by the status detecting device to charge or discharge the storage devices.

Claims

1. Power supply equipment comprising:

a plurality of storage device groups that are connected electrically in parallel, each storage device group having a plurality of storage devices connected electrically in series;

a switch provided correspondingly to each of the storage device groups, the switch being operable to disconnect a corresponding storage device group from other storage device groups;

a voltage measuring device provided correspondingly to each of the storage device groups, which measures a voltage across each of the plurality of storage devices included in each of the storage device groups;

a current measuring device provided correspondingly to each of the storage device groups, which measures a current flowing through a corresponding storage device group;

a plurality of status detecting devices, each of which is connected to each of the storage device groups, receives measured values output by said voltage and current measuring devices of the corresponding one of said storage device groups to detect the status of said corresponding one, and detects the status of said switch provided to each of said corresponding storage groups to control said switch.

2. Power supply equipment according to claim 1, wherein when any of the storage devices included in said corresponding storage device group is replaced, said switch disconnects the corresponding storage device group from the other storage device groups.

3. Power supply equipment according to claim 1, wherein said status detecting device calculates at least one of an internal impedance, an open circuit voltage and a charging status of each of the storage devices included in the corresponding storage device group on the basis of said input measured values.

4. Power supply equipment according to claim 1, wherein said voltage measuring device measures a voltage of each of the storage devices included in the corresponding storage device group and outputs measured values to said corresponding status detecting device, even if the corresponding storage device group is disconnected electrically from other storage device groups.

5. Power supply equipment according to claim 1, wherein said switch is of the mechanical relay type or semiconductor element type.

6. Power supply equipment according to claim 1, wherein said switch is connected electrically in series to one of the storage devices included in the corresponding storage device group at one end of the corresponding storage device group.

7. Power supply equipment according to claim 6, wherein said current detecting device is connected electrically in series to another one of storage devices included in the corresponding storage device group at the other end of the corresponding storage device group.