Device and method of testing an internal resistance of a battery pack
First Claim
1. An internal resistance testing device, comprising:
- an excitation source and a battery pack, which form a loop circuit;
an adjustable resistance R located in the loop circuit;
the excitation source located in the loop circuit and generating an excitation voltage;
a sampling unit configured to measure;
the voltage between two sides of the battery pack,the voltage between two sides of the adjustable resistance R, anda value of the adjustable resistance R; and
a control unit that calculates an internal resistance of the battery pack according to the voltages measured by the sampling unit and the value of the adjustable resistance R; and
wherein the control unit coarsely adjusts a value of the adjustable resistance R to cause the excitation voltage to be about equal to a maximum range voltage of the sampling unit, and wherein the control unit then finely adjusts the value of the adjustable resistance R to be equal to an average value of two voltages levels recorded when the adjustable resistance R was coarsely adjusted.
1 Assignment
0 Petitions
Accused Products
Abstract
An internal resistance testing device includes an excitation source and a battery pack, an adjustable resistance R, a sampling unit, and a control unit. The excitation source and the battery pack form a loop circuit. The adjustable resistance R may be located at the loop circuit formed by the excitation source and the battery pack. The sampling unit samples the voltage between two sides of the battery pack, the voltage between two sides of the adjustable resistance R, and the value of the adjustable resistance R. The control unit calculates internal resistance of the battery pack according to the signal value collected by the sampling unit. The internal resistances of different voltage-ranges the battery pack are determined by adjusting the value of the adjustable resistance R to cause the actual excitation voltage to be equal to the range voltage of the sampling unit. The voltage between two sides of the adjustable resistance R is made equal to the range voltage of the sampling unit by adjusting the value of the adjustable resistance R, which effectively improves measurement accuracy of the internal resistance.
-
Citations
16 Claims
-
1. An internal resistance testing device, comprising:
-
an excitation source and a battery pack, which form a loop circuit; an adjustable resistance R located in the loop circuit; the excitation source located in the loop circuit and generating an excitation voltage; a sampling unit configured to measure; the voltage between two sides of the battery pack, the voltage between two sides of the adjustable resistance R, and a value of the adjustable resistance R; and a control unit that calculates an internal resistance of the battery pack according to the voltages measured by the sampling unit and the value of the adjustable resistance R; and wherein the control unit coarsely adjusts a value of the adjustable resistance R to cause the excitation voltage to be about equal to a maximum range voltage of the sampling unit, and wherein the control unit then finely adjusts the value of the adjustable resistance R to be equal to an average value of two voltages levels recorded when the adjustable resistance R was coarsely adjusted. - View Dependent Claims (2, 3)
-
-
4. A method for determining an internal resistance of a battery pack, the battery pack contained in a loop circuit having an excitation source and an adjustable resistance R, the method comprising the steps of:
-
injecting an excitation signal into the loop circuit; adjusting the value of the adjustable resistance R until the voltage V2 is equal to the range voltage V (standard); increasing the value of the adjustable resistance R until the voltage V2 is less than the range voltage V (standard); storing the value of the adjustable resistance in step (b) as R2; storing the value of the adjustable resistance is R1 which causes the voltage V2 to be equal to the range voltage V (standard) at a previous measurement; finely adjusting the value of the adjustable resistance R to cause an actual excitation, voltage between two sides of the battery pack to be equal to the range voltage V (standard); and calculating the internal resistance of the battery pack according to the voltage V1 between two sides of the adjustable resistance, the value of the adjustable resistance, and the voltage V2 between two sides of the battery pack after adjusting; sampling an excitation voltage V2 generated between two sides of the battery pack; sampling an excitation voltage V1 between the two sides of the adjustable resistance R; determining a value of the adjustable resistance R; adjusting the value of the adjustable resistance R to cause the excitation voltage V2 to be equal to a range voltage V (standard); and calculating the internal resistance of the battery pack based on the excitation voltage V2, the excitation voltage V1, and the adjusted value of the adjustable resistance R. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification