Battery switching system

Patent metadata

Field	Value
Publication number	US-10581259-B2
Application number	US-201715398914-A
Country	US
Kind code	B2
Filing date	Jan 5, 2017
Priority date	Jan 5, 2017
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

A battery switching system for a vehicle controls a first battery device and a second battery device, which provide power to a vehicular load. The system includes multiple switch circuits and a battery control module. The switch circuits are operable for electrically coupling and decoupling each of the first battery device and the second battery device to the load and electrically coupling and decoupling the first battery device from the second battery device. Each of the switch circuits is operable in a closed state and an open state. The battery control module operates the switch circuits based predetermined conditions to form a first electrical path to electrically couple the first and second battery devices, a second electrical path to electrically couple the second battery device and the vehicular load, or a third electrical path to electrically couple the first battery device and the vehicular load.

First claim

What is claimed is:

1. A battery switching system for controlling a first battery device and a second battery device different from the first battery device, the first battery device and the second battery device being disposed in a vehicle for providing power to a vehicular load, the battery switching system comprising:
a plurality of switch circuits operable for electrically coupling and decoupling each of the first battery device and the second battery device to the load and electrically coupling and decoupling the first battery device from the second battery device, wherein each of the switch circuits is operable in a closed state and an open state; and
a battery control module configured to operate one or more of the plurality of switch circuits based on one or more predetermined conditions to form at least one of a first electrical path, a second electrical path, or a third electrical path, wherein:
the first electrical path electrically couples the first battery device and the second battery device,
the second electrical path electrically couples the second battery device and the vehicular load,
the third electrical path electrically couples the first battery device and the vehicular load,
the battery control module electrically couples the first battery device and the vehicular load by way of the third electrical path when a voltage of the first battery device is greater than or equal to a first threshold,
the battery control module electrically couples the first battery device and the second battery device by way of the first electrical path and electrically couples the first battery device and the vehicular load by way of the third electrical path when a voltage of the first battery device is greater than or equal to the first threshold, an engine in the vehicle is in an ON state, and a voltage of the second battery device is less than or equal to a second threshold, and
the battery control module electrically couples the second battery device and the vehicular load by way of the second electrical path when a voltage of the first battery device is less than the first threshold and a voltage of the second battery device is greater than the second threshold;
wherein the plurality of switch circuits includes:
a first set of switch circuits to electrically couple the first battery device and the second battery device,
a second set of switch circuits to electrically couple the second battery device and the vehicular load, and
a third set of switch circuits to electrically couple the first battery device and the vehicular load; and

wherein the battery control module is configured to operate the first set of switch circuits and the third set of switch circuits in the closed state to form the first electrical path and the third electrical path when a voltage of the first battery device is greater than or equal to the first threshold, an engine in the vehicle is in an ON state, and a voltage of the second battery device is less than or equal to the second threshold.

2. The battery switching system of claim 1 wherein the battery control module is configured to operate the second set of switch circuits in the closed state to form the second electrical path when a voltage of the first battery device is less than the first threshold and a voltage of the second battery device is greater than the second threshold.

3. The battery switching system of claim 1 wherein each of the plurality of switch circuits includes a transistor.

4. The battery switching system of claim 1 wherein the one or more predetermined conditions are based on a voltage level of the first battery device, a voltage level of the second battery device, and an operation state of an engine of the vehicle.

5. The battery switching system of claim 1 wherein the battery control module outputs a high level signal to operate a given switch circuit in one of a closed state or an open state, and outputs a low level signal to actuate the given switch circuit in the other one of the closed state or the open state.

6. A battery switching system for controlling a first battery device and a second battery device different from the first battery device, the first battery device and the second battery device being disposed in a vehicle for providing power to a vehicular load, the battery switching system comprising:
a first set of switch circuits from among a plurality of switch circuits to electrically couple the first battery device and the second battery device;
a second set of switch circuits from among the plurality of switch circuits to electrically couple the second battery device and the load;
a third set of switch circuits from among the plurality of switch circuits to electrically couple the first battery device and the load; and
a battery control module configured to operate one or more of the plurality of switch circuits based on one or more predetermined conditions, wherein:
each of the plurality of switch circuits includes a solid state switch that is controlled by the battery control module,
the battery control module outputs a first signal to place a given switch circuit in a closed state and a second signal different from the first signal to place the given switch circuit in an open state,
the battery control module is configured to output the first signal to the second set of switch circuits to electrically couple the first battery device and the second battery device when an engine of the vehicle is in an ON state and the voltage of the first battery device is greater than or equal to a first threshold,
the battery control module is configured to output the first signal to the first set of switch circuits and the third set of switch circuits to electrically couple the first battery device and the second battery device and to electrically couple the first battery and the load when a voltage of the first battery device is greater than or equal to the first threshold, the engine in the vehicle engine is in an ON state, and a voltage of the second battery device is less than or equal to a second threshold, and
the battery control module is configured to output the first signal to the second set of switch circuits to electrically couple the second battery device to the load when a voltage of the first battery device is less than the first threshold and a voltage of the second battery device is greater than the second threshold.

7. The battery switching system of claim 6 wherein when a voltage of the first battery device is less than the first threshold and a voltage of the second battery device is less than the second threshold, the battery control module is configured to output the second signal to the second set of switch circuits and the third set of switch circuits to electrically decouple the first battery device and the load and to electrically decouple the second battery device and the load.

8. The battery switching system of claim 6 wherein each of the plurality of switch circuits includes a transistor.

Assignees

• Denso Int America Inc

Inventors

• Al Rasheed Asif
• Gilley Adam

Classifications

• B60L2240/54

  related to batteries · CPC title

• B60L50/61

  by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles · CPC title

• B60L15/2045

  for optimising the use of energy · CPC title

• B60L58/21

  having the same nominal voltage · CPC title

• B60L50/16

  with provision for separate direct mechanical propulsion · CPC title