SAE J2288-1997 LIFE CYCLE TESTING OF ELECTRIC VEHICLE BATTERY MODULES.pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (412) 772-8512 FAX: (412) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (412) 776-4970 FAX: (412) 776-0790 Copyright 1997 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American National Standard J2288 ISSUED JAN
4、97 Issued1997-01 LIFE CYCLE TESTING OF ELECTRIC VEHICLE BATTERY MODULES 1.ScopeThis 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
5、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 unintention
6、ally 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.
7、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 de
8、termined 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 p
9、rocedure defined in this document is functionally identical to the USABC Baseline Life Cycle Test Procedure. 1.1Field of ApplicationElectric Vehicles 1.2Product ClassificationElectrochemical Storage Devices 1.3FormAn Electric Vehicle propulsion battery will consist of a battery configuration of seve
10、ral (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
11、 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
12、 of those included in this document. SAE J2288 Issued JAN97 -2- 2.References 2.1Applicable PublicationsThe following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1SAE PUBLICATIONSAvail
13、able from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J1715Electric Vehicle Terminology SAE J1797Recommended Practice for Packaging of Electric Vehicle Battery Modules SAE J1798Performance Rating of Electric Vehicle Battery Modules 2.2Related PublicationThe following publication is p
14、rovided for information purposes only and is not a required part of this document. U. S. Advanced Battery Consortium Electric Vehicle Battery Test Procedures Manual, Revision 2, January 1996 3.DefinitionsSee SAE J1715. 4.Test Conditions 4.1Test SamplesThe number of test samples to be subjected to th
15、e test regime in this document will be determined by the entity sponsoring the testing based on the confidence level or statistical significance desired from the results. Determination of this value is outside the scope of this document, which is limited to defining the testing method to be used for
16、 any individual module. One commonly used approach is to establish some desired level of conformance. For example, if 23 modules are tested and the value corresponding to 1.28 standard deviations below the average is reported, 90% of the modules from which this sample is drawn can be expected to per
17、form above this value. 4.2Test TemperatureTesting shall be performed at a controlled ambient temperature of 25 C (or at the target temperature specified by the test sponsor for the application) within 2 C. Measured module temperatures shall be stabilized within this range at the start of discharge o
18、r charge cycles. This may require cooling to be applied to reduce the time between the end of a charge or discharge and the beginning of the next discharge or charge. If required, cooling shall be applied using the manufacturers recommended temperature control means, which shall specify the required
19、 coolant flow rates, heat transfer properties, etc. If these are not specified, modules under test shall be cooled by the presence of ambient air, i.e., cooling below ambient temperature shall not be used. 4.3Temperature SensingA minimum of one ambient temperature measurement and one temperature mea
20、surement per module, insulated from ambient environment, is recommended. Different battery manufacturers may recommend specific locations for temperature sensing such as the center of the case side wall, one of the terminals, or the center of the end wall. In the absence of a manufacturer-specified
21、location, use the center of the side wall as a default. Placement in any of these locations should not affect the results as long as the device is not exposed to external conditions that may skew the readings. Locating the sensor on a module terminal may require precautions to assure there is no sho
22、ck hazard. The temperature sense location(s) should be reported with the test results. 4.4Data RecordingData recording should include time, temperature, voltage, current, and visual observations. Data should include a record of any maintenance performed on a module during testing. SAE J2288 Issued J
23、AN97 -3- 4.5Data Sampling FrequencyAll parameters should be measured at a sample rate adequate to ensure that the coulombic and energy capacities of the module under test are accurately determined. For tests involving short-term transient conditions (i.e., dynamic capacity or peak power tests), this
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