Honeywell International Inc.

Hector M Atehortua

Thirumalai G Palanisamy

Harmohan N Singh

Steven Hoenig

In accordance with various embodiments, there is a method for determining the state of charge of a battery. Various embodiments include the steps of determining the specific gravity of the battery and measuring an open circuit voltage of the battery at rest. The open circuit voltage at rest can be used to determine the battery state of charge from a correlation function dependent on the battery specific gravity.

Method for determining state of charge of lead-acid batteries of various specific gravities

In accordance with various embodiments, there is a method for determining the capacity of a battery. Various embodiments include applying a predetermined current ramp to a fully charged lead-acid battery while measuring a battery terminal voltage. An Ican be determined, where the Iis a transition from charging to overcharging. A specific gravity of the lead-acid battery can also be determined. The capacity of the lead-acid battery can then be determined from the Iusing a correlation function that describes the relationship of the Ito the capacity, where the correlation function depends on the specific gravity of the lead-acid battery.

Method for determining capacity of lead-acid batteries of various specific gravities

In accordance with the invention, there is a battery defect detection method comprising applying a current ramp to a battery; determining a first time (t) when a current of the battery reaches a maximum current (I), and determining a second time (t) when a terminal voltage of the battery reaches a maximum voltage (V). The method also includes determining a differential (d), wherein (d)=/(t)&#x2212;(t)/, and wherein (d) corresponds to a magnitude of defects in the battery.

Capacity degredation in a lead acid battery method and apparatus

In accordance with various embodiments, there is a method for determining the available energy of a battery. Various embodiments include the steps of applying an increasing current to the battery and measuring a response voltage of the battery when the increasing current is applied to the battery.

Method and apparatus for determining the available energy of a lithium ion battery

In accordance with various embodiments, there is a method for determining the specific gravity of a battery. Various embodiments include the steps of applying an increasing current ramp to a battery and measuring a response voltage of the battery when the increasing current ramp is applied to the battery. When the current ramp reaches a predetermined current a decreasing current is supplied to the battery and the battery's voltage response is measured. The specific gravity of the battery can be determined based on the voltage response of the battery to the applied current ramp.

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North Bergen, NJ, United States of America

Hector M Atehortua