Dual battery power management system and its battery controller and method for controlling the same

A battery controller, electrically connected to a first battery and a second battery, to be operated at either a series mode or a parallel mode in response to an electrical requirement provided by a load module, comprising:

• a DC-DC converter for receiving a first input voltage provided by the first battery and converting the first input voltage into a converted DC voltage;
• and
• a series-parallel switch for receiving the converted DC voltage and a second input voltage provided by the second battery;
• wherein the series-parallel switch controls the converted DC voltage and the second input voltage to be a series output voltage applied to the load module under the series mode;
• wherein the series-parallel switch controls the converted DC voltage and the second input voltage to be a parallel output voltage applied to the load module under the parallel mode;
• wherein the battery controller comprises a processor for receiving the electrical requirement and controlling the DC-DC converter and the series-parallel switch in response to the electrical requirement;
• switching the parallel mode to the series mode in response to a first threshold by the processor;
• and
• switching the series mode to the parallel mode in response to a second threshold by means of the processor.

A method for controlling a battery controller which is electrically connected to a first battery and second batter and operated at either a series mode or a parallel mode in response to an electrical requirement provided by a load module;

• the method comprising:
• providing a DC-DC converter for receiving a first input voltage provided by the first battery and converting the first voltage into a converted DC voltage;
• and
• providing a series-parallel switch for receiving the converted DC voltage and a second input voltage provided by the second battery;
• wherein the series-parallel switch controls the converted DC voltage and the second input voltage to be a series output voltage applied to the load module under the series mode;
• wherein the series-parallel switch controls the converted DC voltage and the second input voltage to be a parallel output voltage applied to the load module under the parallel mode;
• providing a processor for receiving the electrical requirement and controlling the DC-DC converter and the series-parallel switch in response to the electrical requirement;
• switching the parallel mode to the series mode in response to a first threshold by the processor;
• and
• switching the series mode to the parallel mode in response to a second threshold by means of the processor.