System and method for battery power management
AssigneeFord Global Technologies, LLC
InventorTae-Kyung Lee
Life of this patent
Estimating the term…
Abstract
A battery management system includes a battery pack and a controller. The controller is configured to receive pack terminal voltage and current data. In response, the controller may estimate battery model parameters in an equivalent circuit model and output state variable values indicative of fast and slow dynamics of the voltage responses. The controller may also output parameter values indicative of feedback gains to compute a current limit in a state feedback structure. The controller may further estimate battery current limits based on the state variable values and the feedback gains to control operation of the battery pack.
Claims20
A battery management system comprising:
- a battery pack;
- and
- at least one controller programmed to operate the pack within current limits derived from first and second state variable values and feedback gains, wherein the first state variable values are based on pack terminal voltage and current data having frequency content greater than a threshold value and the second state variable values are based on pack terminal voltage and current data having frequency content less than the threshold value.
A method for controlling a battery pack comprising:
- outputting first state variable values based on pack terminal voltage and current data having frequency content greater than a threshold value and second state variable values based on pack terminal voltage and current data having frequency content less than the threshold value;
- outputting feedback gains associated with the first and second state variable values based on impedance parameters defining an equivalent circuit model of the pack;
- outputting current limits for the pack based on the feedback gains and the first and second state variable values;
- and
- operating the pack based on the limits.
A control system for a battery pack comprising:
- a controller programmed to operate the pack within current limits derived from first and second state variable values and feedback gains, wherein the first state variable values are based on pack terminal voltage and current data having frequency content greater than a threshold value and the second state variable values are based on pack terminal voltage and current data having frequency content less than the threshold value.
Dependencies are inferred from the claim text.