Systems and methods for configuring parameters for charging a battery pack

1. A charging system comprising:

a charger operable for providing a charging current to a battery pack, wherein said charger comprises:

a charging switch coupled between a power source and said battery pack; and

a controller operable for controlling said charging switch and comprising a voltage sensing pin coupled to said battery pack,

wherein said controller is operable for measuring a battery voltage of said battery pack via said voltage sensing pin during a plurality of discrete time slots, and is operable for adjusting a length of a time interval between two consecutive time slots of said plurality of discrete time slots based on said battery voltage, and

wherein said controller is operable for determining an identity of said battery pack and configuring charging parameters for charging said battery pack according to said identity, wherein said charging parameters comprise a level of said charging current.

2. The charging system of claim 1 , wherein said controller is operable for decreasing said length of said time interval if said battery voltage increases.

3. The charging system of claim 1 , wherein said controller further comprises a driving pin coupled to said charging switch, wherein said controller is operable for turning on said charging switch to provide said charging current to said battery pack and for turning off said charging switch during said plurality of discrete time slots according to a state of a signal on said driving pin generated by said controller.

4. The charging system of claim 1 , wherein said battery pack comprises a resistor coupled between an anode of a battery cell and a positive terminal of said battery pack,

wherein said controller is operable for turning off said charging switch and measuring a first battery voltage of said battery pack while said charging switch is off,

wherein said controller is operable for enabling said battery pack to generate a discharging current flowing from said anode of said battery cell through said resistor and said voltage sensing pin into said controller,

wherein said controller is operable for measuring a second battery voltage of said battery pack while said discharging current is generated and said charging switch is off, and

wherein said controller is further operable for determining said identity of said battery pack based on a difference between said first battery voltage and said second battery voltage.

5. The charging system of claim 1 , wherein said battery pack comprises:

a resistor coupled between a battery cell and a positive terminal of said battery pack; and

a diode coupled in parallel with said resistor, wherein a cathode of said diode is coupled to an anode of said battery cell and an anode of said diode is coupled to said positive terminal of said battery pack, and

wherein said controller is operable for measuring a resistance of said resistor through said voltage sensing pin, and determining said identity of said battery pack according to said resistance of said resistor.

6. The charging system of claim 5 , wherein said controller further comprises a driving pin coupled to said charging switch, wherein said controller is operable for turning off said charging switch by driving an off signal at the driving pin and is operable for measuring a first battery voltage of said battery pack when said charging switch is off,

wherein said controller is operable for enabling said battery pack to generate a discharging current flowing from said anode of said battery cell through said resistor and said voltage sensing pin into said controller,

wherein said controller is operable for measuring a second battery voltage of said battery pack while said discharging current is generated and said charging switch is off,

wherein said controller is further operable for measuring said resistance of said resistor based on a difference between said first battery voltage and said second battery voltage.

7. The charging system of claim 5 , wherein said controller is operable for turning on said charging switch to provide said charging current to said battery pack and turning off said charging switch during said plurality of discrete time slots.

8. A method for charging a battery pack, comprising:

providing, by a charger, a charging current to said battery pack;

detecting an identity of said battery pack;

configuring charging parameters for charging said battery pack according to said identity, wherein said charging parameters comprise a level of said charging current;

measuring, by said charger, a battery voltage of said battery pack during a plurality of discrete time slots; and

adjusting, by said charger, a length of a time interval between two consecutive time slots of said plurality of discrete time slots based on said battery voltage.

9. The method of claim 8 , wherein said adjusting comprises:

decreasing said length of said time interval if said battery voltage increases.

10. The method of claim 8 , further comprising:

turning on a charging switch in said charger to provide said charging current to said battery pack; and

turning off said charging switch during said plurality of discrete time slots.

11. The method of claim 8 , wherein said detecting an identity of said battery pack comprises:

turning off a charging switch in said charger;

measuring a first battery voltage of said battery pack while said charging switch is off;

enabling said battery pack to generate a discharging current flowing from an anode of a battery cell in said battery pack through a resistor to said charger;

measuring a second battery voltage of said battery pack while said discharging current is generated and said charging switch is off; and

determining said identity of said battery pack based on a difference between said first battery voltage and said second battery voltage.

12. The method of claim 8 , further comprising:

measuring, by said charger, a resistance of a resistor in said battery pack; and

determining, by said charger, said identity of said battery pack based on said measured resistance.