Li-ion Battery Aging Datasets

Metadata Updated: May 25, 2016

This data set has been collected from a custom built battery prognostics testbed at the NASA Ames Prognostics Center of Excellence (PCoE). Li-ion batteries were run through 3 different operational profiles (charge, discharge and Electrochemical Impedance Spectroscopy) at different temperatures. Discharges were carried out at different current load levels until the battery voltage fell to preset voltage thresholds. Some of these thresholds were lower than that recommended by the OEM (2.7 V) in order to induce deep discharge aging effects. Repeated charge and discharge cycles result in accelerated aging of the batteries. The experiments were stopped when the batteries reached the end-of-life (EOL) criteria of 30% fade in rated capacity (from 2 Ah to 1.4 Ah).

Data Acquisition:

 The testbed comprises:

* Commercially available Li-ion 18650 sized rechargeable batteries,
* Programmable 4-channel DC electronic load,
* Programmable 4-channel DC power supply,
* Voltmeter, ammeter and thermocouple sensor suite,
* Custom EIS equipment,
* Environmental chamber to impose various operational conditions,
* PXI chassis based DAQ and experiment control, and

MATLAB based experiment control, data acquisition and prognostics algorithm evaluation setup (appx. data acquisition rate is 10Hz).

Parameter Description:

 Data Structure:

 cycle: top level structure array containing the charge, discharge and impedance operations

 type: operation  type, can be charge, discharge or impedance

 ambient_temperature: ambient temperature (degree C)

 time: the date and time of the start of the cycle, in MATLAB  date vector format

 data: data structure containing the measurements

    for charge the fields are:

        Voltage_measured: Battery terminal voltage (Volts)

        Current_measured: Battery output current (Amps)

        Temperature_measured: Battery temperature (degree C)

        Current_charge: Current measured at charger (Amps)

        Voltage_charge: Voltage measured at charger (Volts)

        Time: Time vector for the cycle (secs)

    for discharge the fields are:

        Voltage_measured: Battery terminal voltage (Volts)

        Current_measured: Battery output current (Amps)

        Temperature_measured: Battery temperature (degree C)



        Current_charge: Current measured at load (Amps)

        Voltage_charge: Voltage measured at load (Volts)

        Time: Time vector for the cycle (secs)

        Capacity: Battery capacity (Ahr) for discharge till 2.7V

    for impedance the fields are:

        Sense_current: Current in sense branch (Amps)

        Battery_current: Current in battery branch (Amps)

        Current_ratio: Ratio of the above currents

        Battery_impedance: Battery impedance (Ohms) computed from raw data

        Rectified_impedance: Calibrated and smoothed battery impedance (Ohms)

        Re: Estimated electrolyte resistance (Ohms)



        Rct: Estimated charge transfer resistance (Ohms)

Intended Use:

The data sets can serve for a variety of purposes. Because these are essentially a large number of Run-to-Failure time series, the data can be set for development of prognostic algorithms. In particular, due to the differences in depth-of-discharge (DOD), the duration of rest periods and intrinsic variability, no two cells have the same state-of-life (SOL) at the same cycle index. The aim is to be able to manage this uncertainty, which is representative of actual usage, and make reliable predictions of Remaining Useful Life (RUL) in both the End-of-Discharge (EOD) and End-of-Life (EOL) contexts.

Access & Use Information

Public: This dataset is intended for public access and use. License: U.S. Government Work

Downloads & Resources

Dates

Metadata Created Date February 28, 2016
Metadata Updated Date May 25, 2016
Data Update Frequency irregular

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date February 28, 2016
Metadata Updated Date May 25, 2016
Publisher Dashlink
Unique Identifier DASHLINK_133
Maintainer
DAWN MCINTOSH
Maintainer Email
Id {$oid: 56cf5b00a759fdadc44e5609}
Public Access Level public
Data Update Frequency irregular
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 41494861-ea92-4c92-a5b9-5fdd497d74f4
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2010-09-13T09:41:29
Homepage URL https://c3.nasa.gov/dashlink/resources/133/
Language en-US
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2010-10-21T15:18:55
Program Code 026:029
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > Dashlink
Source Datajson Identifier True
Source Hash 688747076357c7e0a8802b5eddd209cc419f5e83
Source Schema Version 1.1

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