US 12,087,920 B2
Battery charger with battery state detection
Patrick J. Clarke, St. Charles, IL (US); and John S. Whiting, North Richland Hills, TX (US)
Assigned to Schumacher Electric Corporation, Fort Worth, TX (US)
Filed by Schumacher Electric Corporation, Fort Worth, TX (US)
Filed on Jun. 26, 2023, as Appl. No. 18/214,202.
Application 18/214,202 is a continuation of application No. 17/548,918, filed on Dec. 13, 2021, granted, now 11,688,891.
Application 17/548,918 is a continuation of application No. 17/068,077, filed on Oct. 12, 2020, granted, now 11,201,361, issued on Dec. 14, 2021.
Application 17/068,077 is a continuation of application No. 16/600,757, filed on Oct. 14, 2019, granted, now 10,804,574, issued on Oct. 13, 2020.
Application 16/600,757 is a continuation of application No. 15/594,822, filed on May 15, 2017, granted, now 10,446,885, issued on Oct. 15, 2019.
Claims priority of provisional application 62/370,317, filed on Aug. 3, 2016.
Claims priority of provisional application 62/336,118, filed on May 13, 2016.
Prior Publication US 2023/0335808 A1, Oct. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 10/44 (2006.01); G01R 31/371 (2019.01); G01R 31/3835 (2019.01); G01R 31/392 (2019.01); H01M 10/42 (2006.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01); G01R 1/20 (2006.01); G01R 13/02 (2006.01); G01R 19/00 (2006.01); G01R 31/00 (2006.01); G01R 31/364 (2019.01); G01R 31/378 (2019.01); G01R 31/379 (2019.01); G01R 31/3842 (2019.01); H01R 13/02 (2006.01); H01R 13/66 (2006.01)
CPC H01M 10/4285 (2013.01) [G01R 31/371 (2019.01); G01R 31/3835 (2019.01); G01R 31/392 (2019.01); H01M 10/446 (2013.01); H01M 10/48 (2013.01); H02J 7/00032 (2020.01); H02J 7/00047 (2020.01); H02J 7/0036 (2013.01); H02J 7/0049 (2020.01); H02J 7/005 (2020.01); H02J 7/0069 (2020.01); H02J 7/00712 (2020.01); H02J 7/00714 (2020.01); H02J 7/00718 (2020.01); H02J 7/007192 (2020.01); G01R 1/203 (2013.01); G01R 13/02 (2013.01); G01R 19/0069 (2013.01); G01R 31/006 (2013.01); G01R 31/364 (2019.01); G01R 31/378 (2019.01); G01R 31/379 (2019.01); G01R 31/3842 (2019.01); H01R 13/025 (2013.01); H01R 13/6616 (2013.01); H01R 13/6625 (2013.01); H01R 13/6683 (2013.01); H01R 13/6691 (2013.01); H02J 7/0048 (2020.01); H02J 7/007194 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A method of identifying a bad battery condition for a lead acid battery connected to a battery charger, the method comprising:
measuring, via a voltage sensor, a first battery voltage of the lead acid battery connected across a pair of electrical conductors;
supplying, via the pair of electrical conductors, a charging current to the lead acid battery during a charging process for a first period of time;
measuring, via the voltage sensor, a second battery voltage of the lead acid battery connected across the pair of electrical conductors after the first period of time;
determining a rate of change of voltage (dv/dt) for the first period of time; and
displaying a bad battery indicator via a display device if the rate of change of voltage (dv/dt) is less than a first rate of change of voltage value.