Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2011-08-23
2011-08-23
Charioui, Mohamed (Department: 2857)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C324S427000, C324S429000
Reexamination Certificate
active
08004243
ABSTRACT:
A method for accurately estimating battery capacity based on a weighting function is provided. The disclosed system monitors battery current and uses the monitored battery current to calculate the state of charge (SOCbyAh) of the battery. The system also measures the open circuit voltage (OCV) of the battery when the system is at rest, rest being determined by achieving a current of less than a preset current value for a period of time greater than a preset time period. The state of charge of the battery is calculated from the OCV (SOCbyOCV). The weighting function is based on ΔSOCbyAh and ΔSOCbyOCV, where ΔSOCbyAh is equal to SOCbyAhFirst timeminus SOCbyAhSecond time, and where ΔSOCbyOCV is equal to SOCbyOCVFirst timeminus SOCbyOCVSecond time. The weighting function also takes into account the errors associated with determining SOCbyAh and SOCbyOCV.
REFERENCES:
patent: 5658682 (1997-08-01), Usuda et al.
patent: 7557584 (2009-07-01), Murakami et al.
patent: 2008/0094035 (2008-04-01), Plett
Baglino Andrew David
Boggs Brian
Carlson Craig Bruce
Kohn Scott Ira
Paryani Anil
Charioui Mohamed
Patent Law Office of David G. Beck
Rivera Vargas Manuel
Tesla Motors, Inc.
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