DIFFUSION-LIMITED ADAPTIVE BATTERY CHARGING
First Claim
1. A method for adaptively charging a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode, comprising:
- determining a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator based on a diffusion time for lithium in the transport-limiting electrode;
calculating a charging current or a charging voltage for the battery based on the determined lithium surface concentration; and
applying the charging current or the charging voltage to the battery.
1 Assignment
0 Petitions
Accused Products
Abstract
Some embodiments of the present invention provide a system that adaptively charges a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode. During operation, the system determines a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator based on a diffusion time for lithium in the transport-limiting electrode. Next, the system calculates a charging current or a charging voltage for the battery based on the determined lithium surface concentration. Finally, the system applies the charging current or the charging voltage to the battery.
-
Citations
28 Claims
-
1. A method for adaptively charging a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode, comprising:
-
determining a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator based on a diffusion time for lithium in the transport-limiting electrode; calculating a charging current or a charging voltage for the battery based on the determined lithium surface concentration; and applying the charging current or the charging voltage to the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An adaptive charging mechanism for a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode, comprising:
-
a current sensor configured to measure a charging current for the battery; a voltage sensor configured to measure a voltage across terminals of the battery; a charging source configured to apply a charging current or a charging voltage to the battery; a controller configured to receive inputs from the current sensor and the voltage sensor and configured to send a control signal to the charging source; wherein the controller is configured to; determine a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator in the battery based on measurements obtained from the current sensor and the voltage sensor to determine a diffusion time for lithium in the transport-limiting electrode; calculate a charging current or a charging voltage for the battery based on the lithium surface concentration; and send a control signal to the charging source to apply the calculated charging current or charging voltage to the battery. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A battery with an adaptive charging mechanism, comprising:
-
a transport-limiting electrode governed by diffusion; an electrolyte separator; a non-transport-limiting electrode; a current sensor configured to measure a charging current for the battery; a voltage sensor configured to measure a voltage across terminals of the battery; a charging source configured to apply a charging current or a charging voltage to the battery; a controller configured to receive inputs from the current sensor and the voltage sensor, and configured to send a control signal to the charging source; wherein the controller is configured to; determine a surface concentration at an interface between the transport-limiting electrode and the electrolyte separator in the battery based on measurements obtained from the current sensor and the voltage sensor to determine a diffusion time for lithium in the transport-limiting electrode; calculate a charging current or a charging voltage for the battery based on the lithium surface concentration; and send a control signal to the charging source to apply the calculated charging current or charging voltage to the battery. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
-
20. A computer-readable storage medium storing instructions that when executed by a controller for a battery cause the controller to perform a method for adaptively charging a battery, wherein the battery is a lithium-ion battery which includes a transport-limiting electrode governed by diffusion, an electrolyte separator and a non-transport-limiting electrode, the method comprising:
-
determining a lithium surface concentration at an interface between the transport-limiting electrode and the electrolyte separator based on a diffusion time for lithium in the transport-limiting electrode; calculating a charging current or a charging voltage for the battery based on the lithium surface concentration; and applying the charging current or charging voltage to the battery. - View Dependent Claims (21, 22, 23, 24)
-
-
25. A method for adaptively charging a battery, comprising:
-
applying a charging current to the battery; entering a zero current state in which the charging current is set to zero; during the zero current state, measuring an open circuit voltage for the battery at two times while the open circuit voltage relaxes toward a steady state; calculating an updated charging current or charging voltage for the battery based on the measured open circuit voltages; and applying the updated charging current or charging voltage to the battery. - View Dependent Claims (26, 27, 28)
-
Specification