Control of Lithium Plating of Lithium-Ion Battery During Charging
AssigneeSouthwest Research Institute
InventorsBapiraju Surampudi, Kevin Jones
Life of this patent
Estimating the term…
Abstract
A method of controlling the charge current during charging of a lithium-ion battery. A battery charging controller is based on a Kalman filter, which uses estimated battery states to generate a feedback metric to continually adjust a battery cell model. The battery cell model then delivers data to an optimization process that generates the charge current.
Claims16
A method of controlling the charge current during charging of a lithium-ion battery, comprising:
- storing a cell model of the battery as part of a cell model process;
- measuring battery state values of the battery, the battery states being at least:
- the battery's electrolyte overpotential and the battery's polarization resistance;
- delivering the battery state values to a Kalman filter process;
- processing the battery state values with the Kalman filter process to obtain a cell model adjustment factor;
- wherein the cell model process is programmed to receive the cell model adjustment factor and a charge current value, and based on the cell model, the cell model adjustment factor, and the charge current value, to generate a model state vector having one or more model state values representing at least the battery's state of charge;
- and
- using an optimization process to generate a new charge current based on the model state vector and the charge current value.
A controller for controlling the charge current during charging of a lithium-ion battery, comprising:
- a cell model process that stores a model of the battery;
- a Kalman filter process operable to receive measured battery state values of the battery, the battery states being at least:
- the battery's electrolyte overpotential and the battery's polarization resistance;
- wherein the Kalman filter process processes the battery state values to obtain a cell model adjustment factor;
- wherein the cell model process is programmed to receive the cell model adjustment factor and a charge current value, and based on the cell model, the cell model adjustment factor, and the charge current value, to generate a model state vector having one or more model state values representing at least the battery's state of charge;
- and
- an optimization process operable to generate a new charge current based on the model state vector and the charge current value.
An improved battery management system for an electric vehicle having at least one lithium-ion battery, the improvement comprising:
- a measurement process for measuring or estimating battery state values, the battery state values being at least:
- the battery's electrolyte overpotential and the battery's polarization resistance;
- a charging controller for controlling the charge current during charging of the battery, comprising:
- a cell model process that stores a model of the battery;
- a Kalman filter process operable to receive the battery state values and to process the battery state values to obtain a cell model adjustment factor;
- wherein the cell model process is programmed to receive the cell model adjustment factor and a charge current value, and based on the cell model, the cell model adjustment factor, and the charge current value, to generate a model state vector having one or more model state values representing at least the battery's state of charge;
- and an optimization process operable to generate a new charge current based on the model state vector and the charge current value.
Dependencies are inferred from the claim text.