Method and system for charge rate adjustment to enhance battery cycle life
First Claim
1. A method of managing charge rates for a battery to reduce total battery charge capacity degradation over time, comprising:
- for a first charge cycle, determining a first charge current (R) for a battery to charge the battery to a percentage (X) of a total battery charge capacity (C) for the battery in an amount of time (T) according to a relationship R=XC/T;
utilizing the first charge current to charge the battery toward the total battery charge capacity (C) for the battery in the first charge cycle;
for a subsequent charge cycle, determining a reduction in the total battery charge capacity for the battery to a reduced total battery charge capacity (CNEW) and determining a new charge current (RNEW)for the battery to charge the battery to the percentage (X) of the reduced total battery charge capacity (CNEW) for the battery in the amount of time (T) according to a relationship RNEW=X(CNEW/C)C/T;
charging the battery toward the reduced total battery charge capacity (CNEW) for the battery in the subsequent charge cycle with the new charge current (RNEW), the new charge current (RNEW) being applied in the subsequent charge cycle to reduce a rate of charge for the battery.
14 Assignments
0 Petitions
Accused Products
Abstract
Methods and systems are disclosed for charge current adjustment to enhance battery cycle life thereby allowing batteries to be charged quickly without accelerating the aging process of the battery. As the charge capacity of the battery degrades over time, the charge current for the battery charging cycles is also reduced so that the effective charge rate for the battery is adjusted to account for the reduction in charge capacity. In this way, battery capacity life is enhanced by avoiding an accelerated charge rate as the battery capacity drops over the operational life of the battery. The methods and systems disclosed are useful for battery-powered information handling systems, as well as other devices where fast charging and long cycle life is desirable, such as cell phones, personal digital assistants (PDAs), electric vehicles and/or any other battery powered devices.
37 Citations
18 Claims
-
1. A method of managing charge rates for a battery to reduce total battery charge capacity degradation over time, comprising:
-
for a first charge cycle, determining a first charge current (R) for a battery to charge the battery to a percentage (X) of a total battery charge capacity (C) for the battery in an amount of time (T) according to a relationship R=XC/T; utilizing the first charge current to charge the battery toward the total battery charge capacity (C) for the battery in the first charge cycle; for a subsequent charge cycle, determining a reduction in the total battery charge capacity for the battery to a reduced total battery charge capacity (CNEW) and determining a new charge current (RNEW)for the battery to charge the battery to the percentage (X) of the reduced total battery charge capacity (CNEW) for the battery in the amount of time (T) according to a relationship RNEW=X(CNEW/C)C/T; charging the battery toward the reduced total battery charge capacity (CNEW) for the battery in the subsequent charge cycle with the new charge current (RNEW), the new charge current (RNEW) being applied in the subsequent charge cycle to reduce a rate of charge for the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An information handling system configured to be powered by a battery or an alternating current to direct current (AC/DC) converter, comprising:
-
an alternating current to direct current (AC/DC) converter; a load coupled to the AC/DC converter, the load representing powered circuitry for an information handling system; a charger coupled to the AC/DC converter; a battery coupled to the charger and to the load; and a battery management unit (BMU) configured to determine for a first charge cycle a first charge current (R) for a battery to charge the battery to a percentage (X) of a total battery charge capacity (C) for the battery in an amount of time (T) according to a relationship R=XC/T, to use the first charge current to charge the battery toward the total battery charge capacity (C) for the battery in a the first charge cycle, to determine for a subsequent charge cycle a reduction in the total battery charge capacity for the battery to a reduced total battery charge capacity (CNEW);
to determine a new charge current (RNEW) for the battery to charge the battery to the percentage (X) of the reduced total battery charge capacity (CNEW) for the battery in the amount of time (T) according to a relationship RNEW=X(CNEW/C)C/T, and to use the new charge current (RNEW) in the subsequent charge cycle to charge the battery toward the reduced battery charge capacity (CNEW) for the battery;wherein the first charge current is applied in the first charge cycle and the new charge current is applied in the subsequent charge cycle to reduce a rate of charge for the battery. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. The information handling system of, wherein the percentage (X) is 80% and the selected amount of time (T) is 1 hour.
Specification