Honeywell International Inc.

Alliedsignal Inc.

Other

Harmohan N Singh

Thirumalai G Palanisamy

Steven Hoenig

Hector M Atehortua

Hassan Ali Kojori

Patrick M Rudai

Stephen Thomas Maio

David Lazarovich

Richard B Huykman

James Vincent Guiheen

Rainer Tegge

Madasamy Shunmugavel

Alpesh Patel

Jeevan Reddy Neelam

Cristian E Anghel

Bernard P Gollomp

Margaret Eagan

Subodh Keshri

James S Johnson

William Hovey

Michael G Biemer

Momcilo Tanic

John Anthony Hosty

Anki Reddy Papana

A system for assuring safe use of a battery pack includes a display unit and a state of health (SoH) monitor connected to the battery pack, the SoH monitor. The SoH monitor a) instructs the SoH monitor to measure terminal voltage of the battery pack at a beginning of a current flow cycle; b) instructs the SoH monitor to measure terminal voltage of the battery pack after completion of the current flow cycle; c) instructs the SoH monitor to successively re-measure terminal voltage of the battery pack after completion of the current flow cycle until one of the successively re-measured terminal voltages is equal to a previous one of the re-measured terminal voltage; d) instructs the SoH monitor to determine and record ampere-hours (Ah) passing through the battery pack during the time period between steps a) and c); e) instructs the SoH monitor to determine SoH of the battery pack as a function of a quotient of a difference between terminal voltages determined in steps a) and c) divided by the Ah determined in step d), and f) instructs the SoH monitor to send the SoH determined in step e) to the display unit for display as an updated SoH of the battery pack. A switch is operable to disconnect the battery pack from the DC power system upon the display unit indicating SoH of the battery pack being below a predetermined value.

System for assuring safe operation of batteries

An online method and apparatus for determining state of charge (SoC) and state of health (SoH) of batteries on platforms that present dynamic charge and discharge environments is disclosed. A rested open circuit voltage (OCV) may be estimated online using a battery dynamic model along with measured terminal voltage, current and temperature. The SoC and SoH can then be determined from this estimated OCV. The apparatus and methods may estimate SoC and SoH of a battery in a real-time fashion without the need to a) disconnect the battery system from service; b) wait for a predefined rest time; or c) depolarize the battery.

Method and apparatus for online determination of battery state of charge and state of health

A power management system may employ a power source, a distribution system between the power source and electrical loads and an energy accumulator. The accumulator may comprise a plurality of energy processing blocks. Each block may have a limited number of energy storage cells connected in series to produce first voltage. A second higher output voltage from the accumulator may be achieved though integrated DC-DC, DC-AC and AC-DC conversion with intermediate boost of AC voltage through high frequency transformers. Bidirectional power flow may be achieved with high efficiency during charge and discharge of the accumulator. Secondary windings of the transformers may be connected with one another in series so that the accumulator can transfer energy between the distribution system and any one or all of the energy processing units in a fault-tolerant and efficient manner.

High voltage electric accumulators with internal distributed DC-DC converters for self regulation and protection

A method for effectively utilizing energy storage components within a microgrid may include the steps of connecting a first plurality of energy storage components to a DC bus through switches, connecting a second plurality of energy storage components to an AC bus through inverters, connecting controllers to the energy storage components, connecting a first plurality of the controllers to the DC bus to regulate bidirectional flow of energy between the DC bus and the first plurality of energy storage components and connecting a second plurality of the controllers to the AC bus to regulate bidirectional flow of energy between the AC bus and the second plurality of energy storage components. The controllers may be interconnected with a local energy storage system bus and controlled via a master microgrid controller connected to the local energy storage system bus. The controllers may have a state of charge and a state of health algorithm adapted to measure the state of charge and the state of health of the energy storage components under dynamic charge or discharge conditions.

Method and apparatus for effective utilization of energy storage components within a microgid

A power management system may comprise a generative power source, a main bus between the generative power source and electrical loads, a energy accumulator and a main bi directional power converter interposed between the main bus and the energy accumulator unit. The energy accumulator may comprise a plurality of energy storage blocks. The energy storage blocks may individually comprise energy storage units and control units with dedicated DC/DC bidirectional power converters.

Electric accumulators having self regulated battery with integrated bi-directional power management and protection

A hybrid power system is comprised of a high energy density element such as a fuel-cell and high power density elements such as a supercapacitor banks. A DC/DC converter electrically connected to the fuel cell and converting the energy level of the energy supplied by the fuel cell. A first switch is electrically connected to the DC/DC converter. First and second supercapacitors are electrically connected to the first switch and a second switch. A controller is connected to the first switch and the second switch, monitoring charge levels of the supercapacitors and controls the switching in response to the charge levels. A load is electrically connected to the second switch. The first switch connects the DC/DC converter to the first supercapacitor when the second switch connects the second supercapacitor to the load. The first switch connects the DC/DC converter to the second supercapacitor when the second switch connects the first supercapacitor to the load.

Hybrid power source

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

Embodiments provide a method and a system for determining cell imbalance condition of a multi-cell battery including a plurality of cell strings. To determine a cell imbalance condition, a charge current is applied to the battery and is monitored during charging. The charging time for each cell string is determined based on the monitor of the charge current. A charge time difference of any two cell strings in the battery is used to determine the cell imbalance condition by comparing with a predetermined acceptable charge time difference for the cell strings.

Lithium-ion battery diagnostic and prognostic techniques

In accordance with various embodiments, there are systems and methods for predicting end of life of a Li-ion battery. The method can include at least one of partially charging and partially discharging a battery, measuring an open circuit voltage of the battery before and after at least one of partial charging and partial discharging, and determining a state of charge value of the battery corresponding to the open circuit voltage measured before and after at least one of partial charging and partial discharging. The method can also include correlating at least one of a charge energy and a discharge energy with a change in the state of charge value and extrapolating to get a full battery capacity, tracking the full battery capacity as a function of time, and performing trend analysis of the full battery capacity over time to predict the battery's end of life.

Lithium-ion battery prognostic testing and process

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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Rockaway, NJ, United States of America

Harmohan N Singh