Method and apparatus of detecting voltage for battery pack

• US 20060290355A1
• Filed: 05/30/2006
• Published: 12/28/2006
• Est. Priority Date: 05/27/2005
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Jonathan
• Granted Patent: US 7,589,534 B2
• Time in Patent Office: Days
• US Class Current: 324/429
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements

Abstract

Disclosed is a method and apparatus of detecting voltage of a battery cell in consideration of impedance of conductive wires connecting a plurality of battery cells constituting the battery pack. The method of detecting voltage of at least one battery cell in a battery pack, in which the battery cell is connected through a conductive wire, includes the steps of storing impedance of the conductive wire from a part connected to a voltage detector to a part connected with the corresponding battery cell, detecting current of the battery pack, multiplying the impedance of the conductive wire corresponding to each battery cell and the current to calculate a correction value of each battery cell, detecting voltage of each battery cell, and correcting the voltage of each battery cell on the basis of the correction value of each battery cell. Further, the apparatus of detecting voltage of at least one battery cell in a battery pack, in which the battery cell is connected through a conductive wire, includes a voltage detector detecting the voltage of each battery cell, a memory storing impedance of the conductive wire from a part connected to a voltage detector to a part connected with the corresponding battery cell, a current detector detecting current of the battery pack, and a controller multiplying the impedance of the conductive wire corresponding to each battery cell and the current to calculate a correction value of each battery cell, and correcting the voltage of each battery cell on the basis of the correction value of each battery cell.

Claims

1. A method of detecting a voltage of at least one battery cell in a battery pack, in which the battery cell is connected through a conductive wire, the method comprising the steps of:

storing impedance of the conductive wire from a part connected to a voltage detector to a part connected with the corresponding battery cell;

detecting current of the battery pack;

multiplying the impedance of the conductive wire corresponding to each battery cell and the current to calculate a correction value of each battery cell;

detecting voltage of each battery cell; and

correcting the voltage of each battery cell on the basis of the correction value of each battery cell.

2. The method as claimed in claim 1, wherein the step of correcting the voltage of each battery cell subtracts or adds the correction value of each battery cell from or to the voltage of each battery cell according to a charged or discharged state of each battery cell.

3. The method as claimed in claim 2, wherein the charged or discharged state of each battery cell is detected based on the detected current.

4. An apparatus of detecting voltage of at least one battery cell in a battery pack, in which the battery cell is connected through a conductive wire, the apparatus comprising:

a voltage detector detecting the voltage of each battery cell;

a memory storing impedance of the conductive wire from a part connected to a voltage detector to a part connected with the corresponding battery cell;

a current detector detecting current of the battery pack; and

a controller multiplying the impedance of the conductive wire corresponding to each battery cell and the current to calculate a correction value of each battery cell, and correcting the voltage of each battery cell on the basis of the correction value of each battery cell.

5. The apparatus as claimed in claim 4, wherein the controller subtracts or adds the correction value of each battery cell from or to the voltage of each battery cell according to a charged or discharged state of each battery cell.

6. The apparatus as claimed in claim 5, wherein the charged or discharged state of each battery cell is detected based on the detected current of the battery pack.