Charge balancing for a multi-bay power supply

Patent metadata

Field	Value
Publication number	US-2021408806-A1
Application number	US-202117357238-A
Country	US
Kind code	A1
Filing date	Jun 24, 2021
Priority date	Jun 25, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

A multi-bay power supply including a plurality of energy storage devices, a power output configured to provide power from the plurality of energy storage devices to a peripheral device, and a controller including an electronic processor. The controller is configured to determine which battery of the plurality of energy storage devices has a highest state of charge, provide power to the peripheral device by discharging the energy storage device having the highest state of charge for a first configurable amount of time. The controller is further configured to provide power to the peripheral device by discharging the energy storage devices having the highest state of charge and any energy storage devices in the plurality of energy storage devices having a state of charge that is within a tolerance of the highest state of charge.

First claim

What is claimed is:

1 . A multi-bay power supply comprising:
a plurality of energy storage devices; a power output configured to provide power from the plurality of energy storage devices to a peripheral device; and a controller including an electronic processor configured to:
determine which energy storage device of the plurality of energy storage devices has a highest state of charge,
provide power to the peripheral device by discharging the energy storage device having the highest state of charge for a first configurable amount of time,
determine whether any energy storage devices in the plurality of energy storage devices have a state of charge that is within a tolerance of the highest state of charge, and
provide power to the peripheral device by discharging the energy storage device having the highest state of charge and any energy storage devices in the plurality of energy storage devices having the state of charge that is within the tolerance of the highest state of charge.

2 . The multi-bay power supply of claim 1 , wherein the energy storage device having the highest state of charge and the energy storage devices in the plurality of energy storage devices having states of charge that are within the tolerance of the highest state of charge are discharged for a second configurable amount of time.

3 . The multi-bay power supply of claim 2 , wherein the controller is further configured to read updated state of charge values of energy storage devices in the plurality of energy storage devices after the second configurable amount of time has passed.

4 . The multi-bay power supply of claim 2 , wherein the controller is configured to discharge the energy storage devices in the plurality of energy storage devices having the state of charge that is within the tolerance of the highest state of charge by turning on switching elements that are provided on respective current paths between the energy storage devices in the plurality of energy storage devices having the state of charge that is within the tolerance of the highest state of charge and the peripheral device.

5 . The multi-bay power supply of claim 1 , wherein the plurality of energy storage devices includes rechargeable power tool battery packs.

6 . The multi-bay power supply of claim 1 , wherein the controller is configured to discharge the energy storage device having the highest state of charge by turning on a switching element that is provided on a current path between the energy storage device having the highest state of charge and the peripheral device.

7 . The multi-bay power supply of claim 1 , wherein the peripheral device is a heated article of clothing.

8 . The multi-bay power supply of claim 1 , further comprising:
a plurality of energy storage device bays, wherein each of the plurality of energy storage devices is electrically connectable to a respective one of the plurality of energy storage device bays.

9 . The multi-bay power supply of claim 8 , wherein the plurality of energy storage device bays is disposed in a housing of the multi-bay power supply.

10 . The multi-bay power supply of claim 1 , wherein energy storage devices included in the plurality of energy storage devices are electrically connectable in parallel.

11 . The multi-bay power supply of claim 1 , wherein the tolerance is a percentage of the highest state of charge.

12 . The multi-bay power supply of claim 1 , wherein the tolerance is a scalar value representative of an allowable difference between a voltage value of the energy storage device having the highest state of charge and a voltage value of any other of the energy storage devices in the plurality of energy storage devices.

13 . A method of discharging a multi-bay power supply, the multi-bay power supply including a plurality of energy storage devices, a power output configured to provide power from the plurality of energy storage devices to a peripheral device, and a controller including an electronic processor, the method comprising:
determining, using the controller, which energy storage device in the plurality of energy storage devices has a highest state of charge; activating, using the controller, the energy storage device having the highest state of charge to enable power flow from the energy storage device having the highest state of charge to the peripheral device; discharging, using the controller, the energy storage device having the highest state of charge for a first configurable amount of time; determining, using the controller, whether any energy storage devices in the plurality of energy storage devices have a state of charge that is within a tolerance of the highest state of charge; activating, using the controller, any energy storage devices in the plurality of energy storage devices having a state of charge that is within the tolerance of the highest state of charge to enable power flow from the energy storage devices having states of charge within the tolerance to the peripheral device; and discharging, using the controller, the energy storage device having the highest state of charge and the energy storage devices having states of charge within the tolerance for a second configurable amount of time.

14 . The method of claim 13 , wherein activating the energy storage device having the highest state of charge includes turning on a switch, by the controller, that is provided on a current path from the energy storage device having the highest state of charge to the peripheral device.

15 . The method of claim 13 , further comprising:
reading, by the controller, updated state of charge values of energy storage devices included in the plurality of energy storage devices after the second configurable amount of time has passed.

16 . The method of claim 13 , wherein the peripheral device is a heated article of clothing.

17 . A method of charging a multi-bay battery system, the multi-bay battery system including a plurality of energy storage devices, a power input configured to provide power from an external power source to the plurality of energy storage devices, and a controller including an electronic processor, the method comprising:
determining, using the controller, which energy storage device in the plurality of energy storage devices has a lowest state of charge; activating, using the controller, the energy storage device having the lowest state of charge to enable power flow from the external power source to the energy storage device having the lowest state of charge; charging, using the controller, the energy storage device having the lowest state of charge for a first configurable amount of time; determining, using the controller, whether any energy storage devices in the plurality of energy storage devices have a state of charge that is within a tolerance of the lowest state of charge; activating, using the controller, any energy storage devices in the plurality of energy storage devices having a state of charge that is within the tolerance of the lowest state of charge to enable power flow from the external power source to the energy storage devices having states of charge within the acceptable tolerance; and charging, using the controller, the energy storage devices having the lowest state of charge and the energy storage devices having states of charge within the acceptable tolerance for a second configurable amount of time.

18 . The method of claim 17 , wherein activating the energy storage device having the lowest state of charge comprises turning on a switch, by the controller, tha

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Stanke Zachary G
• Sheeks Samuel

Classifications

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H01M10/441

  for several batteries or cells simultaneously or sequentially · CPC title

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title