State-of-charge measuring method using multilevel peukert's equation

• US 5,614,829 A
• Filed: 03/27/1996
• Issued: 03/25/1997
• Est. Priority Date: 09/27/1994
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Y.P. Lee & Associates
• Inventors: Song, Sung-ku
• Primary Examiner(s): Wieder, Kenneth A.
• Assistant Examiner(s): DO, DIEP N
• Application Number:
  US08/622,350
• Time in Patent Office: 363 Days
• Field of Search: 324/426, 324/427, 324/428, 324/430, 324/431, 324/432, 324/433, 324/434, 320/48, 340/636, 364/483
• US Class Current: 324/427
• CPC Class Codes: G01R 31/006 on road vehicles, e.g. automobiles or trucks testing of ignition installations peculiar to internal combustion engines F02P17/00
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/3828 using current integration
• CPC Class Codes: Y10S 320/21 State of charge of battery

Abstract

The method of measuring the state-of-charge of a battery by using multilevel Peukert'"'"'s equation which is different from conventional Peukert'"'"'s equation in such a way that the conventional Peukert'"'"'s equation uses only two reference points to obtain Peukert'"'"'s constants whereas the multilevel Peukert'"'"'s equation uses a third reference point to obtain two sets of Peukert'"'"'s constants. By doing so, the state-of-charge of a battery can be measured more precisely and the reliability of a battery powered product can be enhanced.

Claims

1. A state-of-charge measuring method using multilevel Peukert'"'"'s equation comprising the steps of:

a) determining two sets of Peukert'"'"'s constants, a first set for calculating the state-of-charge when an average discharge current is on a lower side, and a second set for calculating the state-of-charge when the average discharge current is on a higher side;

b) measuring a discharge current from a battery;

c) calculating an average discharge current using said discharge current;

d) calculating a used capacity from said average discharge current;

e) comparing said average discharge current to an intermediate current;

f) classifying said average discharge current as said lower or higher side to determine which set of Peukert'"'"'s constants to use;

g) obtaining an available capacity using the set of Peukert'"'"'s constants obtained from said step f); and

h) determining the state-of-charge using said used capacity and said available capacity.

2. A state-of-charge measuring method using multilevel Peukert'"'"'s equation as claimed in claim 1, wherein said determining two sets of Peukert'"'"'s constants comprising the steps of:

calculating said first set of Peukert'"'"'s constants for said average discharge current using a minimum current and said intermediate current; and

calculating the second set of Peukert'"'"'s constants for said average discharge current using a maximum current and said intermediate current.