Battery state estimation method
AssigneeNokia Corporation
InventorsMarkku Rajamaki, Jarno Rajala
Life of this patent
Estimating the term…
Abstract
The invention relates to a method, The method comprises measuring a first battery voltage of a battery of a device at and a first charging current after terminating a constant current charging mode and before initiating a constant voltage charging mode, producing a charging impulse on the battery, measuring a second battery voltage and a second charging current, and determining an impedance of the battery on the basis of a voltage difference between the first and the second battery voltage and a difference between the first and the second charging current. The invention further relates to an apparatus and a computer program product that perform the method.
Claims16
A method, comprising:
- measuring a first battery voltage of a battery of a device and a first charging current after terminating a constant current charging mode;
- producing a charging impulse on the battery;
- measuring a second battery voltage and a second charging current;
- and
- determining an impedance of the battery on the basis of a voltage difference between the first and the second battery voltage and a difference between the first and the second charging current.
An apparatus comprising at least one processor, memory including computer program code, the memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following:
- measure a first battery voltage of a battery of a device and a first charging current after terminating a constant current charging mode and before initiating a constant voltage charging mode;
- produce a charging impulse on the battery;
- measure a second battery voltage and a second charging current;
- and
- determine an impedance of the battery on the basis of a voltage difference between the first and the second battery voltage and a difference between the first and the second charging current.
Dependencies are inferred from the claim text.