METHOD AND DEVICE FOR MEASURING INTERNAL RESISTANCE OF BATTERY
First Claim
1. A device for measuring an internal resistance of a battery comprising:
- a charging unit configured for respectively charging the battery through a first resistor and a second resistor;
a measuring unit configured for measuring a first voltage across the first resistor and a second voltage across the second resistor;
a calculating unit configured for calculating the internal resistance of the battery via the formula;
Resr=(V2−
V1 )/(V1/R1−
V2/R2), wherein, Resr is the internal resistance of the battery, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V1 is the first voltage across the first resistor, and V2 is the second voltage across the second resistor.
1 Assignment
0 Petitions
Accused Products
Abstract
A device for measuring an internal resistance of a battery includes a charging unit, a switch, a measuring unit, and a calculating unit. The charging unit is used for respectively charging the battery through a first resistor (R1) and a second resistor (R2). The switch is used for selectively connecting one of the first resistor and the second resistor to the battery. The measuring unit is used for measuring a first voltage (V1) across the first resistor and a second voltage (V2) across the second resistor. The calculating unit is used for calculating the internal resistance (Resr) via a following formula : Resr=(V2−V1)/(V1/R1-V2/R2). A related method for measuring the internal resistance of the battery is also provided.
9 Citations
18 Claims
-
1. A device for measuring an internal resistance of a battery comprising:
-
a charging unit configured for respectively charging the battery through a first resistor and a second resistor; a measuring unit configured for measuring a first voltage across the first resistor and a second voltage across the second resistor; a calculating unit configured for calculating the internal resistance of the battery via the formula;
Resr=(V2−
V1 )/(V1/R1−
V2/R2), wherein, Resr is the internal resistance of the battery, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V1 is the first voltage across the first resistor, and V2 is the second voltage across the second resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method for measuring an internal resistance of a battery, the method comprises the steps of:
-
measuring a terminal voltage of the battery; comparing the terminal voltage of the battery with a predetermined voltage;
connecting a charging unit with a first resistor and the battery, charging the battery through the first resistor, and measuring a voltage across the first resistor when the terminal voltage of the battery is smaller than the predetermined voltage;connecting the charging unit with a second resistor and the battery, charging the battery through the second resistor, and measuring the voltage across the second resistor; calculating the internal resistance of the battery via a formula;
Resr=(V2−
V1)/(V1/R1−
V2/R2), wherein, Resr is the internal resistance of the battery, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V1 is the voltage across the first resistor, and V2 is the voltage across the second resistor;displaying the internal resistance of the battery. - View Dependent Claims (16)
-
-
17. A method for measuring an internal resistance of a battery, the method comprises the steps of:
-
measuring a terminal voltage of the battery; comparing the terminal voltage of the battery with a predetermined voltage; connecting the discharging unit with the first resistor and the battery, discharging the battery through the first resistor, and measuring the voltage across the first resistor when the terminal voltage of the battery is larger than the predetermined voltage; connecting the discharging unit with the battery and the second resistor, discharging the battery through the second resistor, and measuring the voltage across the second resistor; calculating the internal resistance of the battery via a formula;
Resr=(V2−
V1)/(V1/R1−
V2/R2), wherein, Resr is the internal resistance of the battery, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V1 is the voltage across the first resistor, and V2 is the voltage across the second resistor;displaying the internal resistance of the battery. - View Dependent Claims (18)
-
Specification