Development of fast charge profiles for lithium-ion batteries
AssigneeSouthwest Research Institute
InventorsBapiraju Surampudi, Shuvodeep Bhattacharjya, Kevin Jones
Life of this patent
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Abstract
A method of developing a charging profile for charging a lithium-ion battery. A first phase of charging is at a constant current level, with the constant current level selected on the basis of battery resistance during charging and differential voltage (dV/dQ) analysis. A switch point is selected on the basis of a state of charge (SOC) of the battery when dV/DQ values increase. Next is an increasing voltage charging phase, with the voltage rate selected on the basis of charge acceptance and charge time.
Claims4
A method of determining a charging profile for lithium-ion battery, comprising:
- selecting a constant current level for a first phase of charging;
- wherein the constant current level is selected on the basis of battery resistance during charging and differential voltage (dV/dQ) analysis;
- selecting a switch point at a state of charge (SOC) of the battery on the basis of when dV/dQ values increase;
- selecting an increasing voltage charging rate after the switch point;
- wherein the increasing voltage rate is selected on the basis of battery charge acceptance and charge time;
- and
- combining the constant current level, the switch point, and the increasing voltage rate to generate a charging profile.
Dependencies are inferred from the claim text.