Method To Charge Lithium-Ion Batteries With User, Cell And Temperature Awareness

A method for charging a battery cell having lithium-ion composition, comprising:

• receiving, by a controller, an user available time in which the battery cell is to be charged;
• determining, by the controller, a current charging time period for charging the battery cell with a constant current, where the determination of the current charging time period accounts for the user available time and a predefined time period for relaxing the battery cell;
• determining, by the controller, a threshold voltage to which the battery cell is to be charged with the constant current, where the threshold voltage is constrained by the current charging time period and the threshold voltage is less than a maximum voltage to which the battery cell can be charged to;
• and
• determining, by the controller, a secondary voltage which is to be applied to the battery cell during a secondary charging phase, where the secondary voltage is constrained by the available time period and the secondary voltage is less than a maximum voltage to which the battery cell can be charged to.

A method for charging a battery cell having lithium-ion composition, comprising:

• receiving an user available time in which the battery cell is to be charged;
• determining a current charging time period for charging the battery cell with a constant current, where the determination of the current charging time period accounts for the user available time and a predefined time period for relaxing the battery cell;
• determining a threshold voltage to which the battery cell is to be charged with the constant current, where the threshold voltage is constrained by the current charging time period and a maximum safe temperature of the battery, wherein the threshold voltage is less than a maximum voltage to which the battery cell can be charged to;
• and
• delivering a constant current to the battery cell until cell voltage of the battery cell reaches the threshold voltage.