State of charge determination
First Claim
Patent Images
1. A method of determining the state of charge of a battery of an electric vehicle during charging at a charging station, comprising:
- providing a charging current having a first magnitude from the charging station to the battery of the electric vehicle;
decreasing a magnitude of the charging current from the first magnitude to a second magnitude after a first predetermined time, wherein the first predetermined time is a value preprogrammed into a control system that controls the charging, and wherein the second magnitude is the magnitude of current discharged from the battery during the charging;
determining a voltage across the battery while providing the second magnitude of current to the battery;
determining a state of charge of the battery as a function of the determined voltage from a battery characterization curve; and
increasing the magnitude of the charging current from the second magnitude to a third magnitude after determining the state of charge.
4 Assignments
0 Petitions
Accused Products
Abstract
A method of determining the state of charge of a battery during charging may include providing a charging current having a first magnitude to the battery for charging, and changing a magnitude of the charging current from the first magnitude to a second magnitude. The second magnitude may be equal to the magnitude of current discharged from the battery during the charging. The method may also include determining a voltage across the battery after the changing, and determining a state of charge of the battery as a function of the determined voltage from a battery characterization curve.
16 Citations
17 Claims
-
1. A method of determining the state of charge of a battery of an electric vehicle during charging at a charging station, comprising:
-
providing a charging current having a first magnitude from the charging station to the battery of the electric vehicle; decreasing a magnitude of the charging current from the first magnitude to a second magnitude after a first predetermined time, wherein the first predetermined time is a value preprogrammed into a control system that controls the charging, and wherein the second magnitude is the magnitude of current discharged from the battery during the charging; determining a voltage across the battery while providing the second magnitude of current to the battery; determining a state of charge of the battery as a function of the determined voltage from a battery characterization curve; and increasing the magnitude of the charging current from the second magnitude to a third magnitude after determining the state of charge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of determining the state of charge of a battery of an electric vehicle during charging, comprising:
-
providing a charging current to the battery during a charging event, the charging current having a first magnitude; determining a magnitude of current discharged from the battery during the charging event; periodically decreasing the magnitude of the charging current from the first magnitude to a second magnitude after a predetermined period of time, the predetermined period of time being a value preprogrammed into a control system that controls the charging event, wherein the second magnitude is substantially equal to the determined magnitude of current; determining a voltage across the battery while providing the second magnitude of current to the battery; determining a state of charge of the battery corresponding to the determined voltage from a battery characterization curve; and changing the magnitude of current provided to the battery to a higher value after determining the state of charge. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A charging system for a battery, comprising:
-
one or more batteries; a charging interface configured to electrically connect the one or more batteries to a power supply for charging; and a control system configured to; provide a charging current having a first magnitude to the one or more batteries for charging; decrease a magnitude of the charging current from the first magnitude to a second magnitude after a first predetermined time, wherein the first predetermined time is a value preprogrammed into the control system, and wherein the second magnitude is the magnitude of current discharged from the one or more batteries during the charging; determine a state of charge of the one or more batteries while being provided with charging current having the second magnitude; and change the magnitude of the charging current from the second magnitude to a third magnitude after determining the state of charge, wherein the third magnitude is greater than the second magnitude. - View Dependent Claims (14, 15, 16, 17)
-
Specification