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SAE J2288 1997 Edition, January 1997
Life Cycle Testing of Electric Vehicle Battery Modules
Description / Abstract:
This SAE Recommended Practice defines a standardized test method
to determine the expected service life, in cycles, of electric
vehicle battery modules. It is based on a set of nominal or
baseline operating conditions in order to characterize the expected
degradation in electrical performance as a function of life and to
identify relevant failure mechanisms where possible. Accelerated
aging is not included in the scope of this procedure, although the
time compression resulting from continuous testing may
unintentionally accelerate battery degradation unless test
conditions are carefully controlled. The process used to define a
test matrix of accelerated aging conditions based on failure
mechanisms, and to establish statistical confidence levels for the
results, is considered beyond the scope of this document.
Because the intent is to use standard testing conditions whenever possible, results from the evaluation of different technologies should be comparable. End-of-life is determined based on module capacity and power ratings. This may result in a measured cycle life different than that which would be determined based on actual capacity; however, this approach permits a battery manufacturer to make necessary tradeoffs between power and energy in establishing ratings for a battery module. This approach is considered appropriate for a mature design or production battery. It should be noted that the procedure defined in this document is functionally identical to the USABC Baseline Life Cycle Test Procedure.
Field of Application—
Electric Vehicles
Product Classification—
Electrochemical Storage Devices
Form—
An Electric Vehicle propulsion battery will consist of a battery configuration of several (typically 12 V) modules interconnected in one or more series strings. This document provides test methods to determine the life expectancy of such modules, including but not limited to modules built in accordance with SAE J1797. Use of this document is intended for single independently packaged modules operating at ambient conditions (i.e., standard room temperature). Testing of a fully configured propulsion battery system, especially when designed to operate at elevated or reduced temperatures, usually results in reduced expected service life and requires testing methods beyond the scope of those included in this document.
Because the intent is to use standard testing conditions whenever possible, results from the evaluation of different technologies should be comparable. End-of-life is determined based on module capacity and power ratings. This may result in a measured cycle life different than that which would be determined based on actual capacity; however, this approach permits a battery manufacturer to make necessary tradeoffs between power and energy in establishing ratings for a battery module. This approach is considered appropriate for a mature design or production battery. It should be noted that the procedure defined in this document is functionally identical to the USABC Baseline Life Cycle Test Procedure.
Field of Application—
Electric Vehicles
Product Classification—
Electrochemical Storage Devices
Form—
An Electric Vehicle propulsion battery will consist of a battery configuration of several (typically 12 V) modules interconnected in one or more series strings. This document provides test methods to determine the life expectancy of such modules, including but not limited to modules built in accordance with SAE J1797. Use of this document is intended for single independently packaged modules operating at ambient conditions (i.e., standard room temperature). Testing of a fully configured propulsion battery system, especially when designed to operate at elevated or reduced temperatures, usually results in reduced expected service life and requires testing methods beyond the scope of those included in this document.
SAE J2288 1997 Edition, January 1997
Life Cycle Testing of Electric Vehicle Battery Modules