ADJUSTING CHARGE VOLTAGE ON CELLS IN MULTI-CELL BATTERY

• US 20150276886A1
• Filed: 03/26/2014
• Published: 10/01/2015
• Est. Priority Date: 03/26/2014
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Bulur, Yakup, Fishbune, Richard J., Maresh, Mark E., Swenson, Neil C., Wheeler, Adam M.
• Application Number:
  US14/225,839
• Publication Number:
  US 20150276886A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage

Abstract

A battery pack includes a plurality of cells. Two or more fuel gauges are associated with a voltage adjustable set of the plurality of cells. Each of the two or more fuel gauges is associated with one cell in the voltage adjustable set. Each of the two or more fuel gauges is configured to communicate cell capacity of the associated cell to a master controller. Two or more charge voltage controllers are associated with the voltage adjustable set. Each of the two or more charge voltage controllers is associated with one or more cells in the voltage adjustable set. Each of the two or more charge voltage controllers is configured to receive a signal from the master controller. Each of the two or more charge voltage controllers is configured to increase charge voltage on the associated one or more cells in response to receiving the signal.

Claims

1. A battery pack comprising:

a plurality of cells;

two or more fuel gauges associated with a voltage adjustable set of the plurality of cells, each of the two or more fuel gauges associated with one cell in the voltage adjustable set, each of the two or more fuel gauges configured to communicate cell capacity of the associated cell to a master controller;

two or more charge voltage controllers associated with the voltage adjustable set, each of the two or more charge voltage controllers associated with one or more cells in the voltage adjustable set, each of the two or more charge voltage controllers configured to receive a signal from the master controller, each of the two or more charge voltage controllers configured to increase charge voltage on the associated one or more cells in response to receiving the signal.

2. The battery pack of claim 1, wherein the voltage adjustable set comprises all of the plurality of cells.

3. The battery pack of claim 1, wherein the two or more charge voltage controllers are each associated with one cell.

4. The battery pack of claim 1, further comprising:

the master controller.

5. The battery pack of claim 4, wherein the master controller is configured to identify a target cell and send the signal to a first charge voltage controller associated with the target cell, the first charge voltage controller one of the two or more charge voltage controllers.

6. The battery pack of claim 5, wherein identifying the target cell comprises determining the target cell has a lowest capacity of the adjustable set.

7. The battery pack of claim 5, wherein identifying the target cell comprises determining the target cell has a highest capacity of the voltage adjustable set.

8. The battery pack of claim 5, wherein identifying the target cell comprises determining that the target cell has not been associated with a flag.

9. The battery pack of claim 4, wherein the master controller is configured to determine an overall capacity for the battery pack and determine the overall capacity is below a minimum level.

10. A method for charging a battery pack containing a plurality of cells, the method comprising:

determining, by a plurality of fuel gauges, capacity information for a voltage adjustable set of the plurality of cells, each of a plurality of fuel gauges associated with one cell in the voltage adjustable set;

sending, from the plurality of fuel gauges, the capacity information to a master controller;

receiving, by a charge voltage controller, a signal from the master controller, the charge voltage controller associated with one or more cells in the voltage adjustable set;

increasing, by the charge voltage controller, charge voltage on the one or more cells associated with the charge voltage controller in response to receiving the signal.

11. The method of claim 10, wherein the voltage adjustable set comprises all of the plurality of cells.

12. The method of claim 10, wherein the charge voltage controller is associated with one cell.