GB/T 31467.2-2015 PDF English
US$85.00 · In stock · Download in 9 secondsGB/T 31467.2-2015: [Replaced by GB/T 31467-2023] Lithium-ion traction battery pack and system for electric vehicles -- Part 2: Test specification for high energy applications Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Obsolete
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[Replaced by GB/T 31467-2023] Lithium-ion traction battery pack and system for electric vehicles -- Part 2: Test specification for high energy applications
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GB/T 31467.2-2015: [Replaced by GB/T 31467-2023] Lithium-ion traction battery pack and system for electric vehicles -- Part 2: Test specification for high energy applications
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080
T 47
Lithium-ion traction battery pack and system for electric
vehicles - Part 2.Test specification for high energy
applications
(ISO 12405-2.2012, Electrically propelled road vehicles - Test specification for
lithium-ion traction battery packs and systems - Part 2.High-energy
applications, NEQ)
Issued on. MAY 15, 2015
Implemented on. MAY 15, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Symbols and abbreviated terms... 6
5 General requirements... 6
6 Common test cycle... 9
7 Basic performances... 10
Appendix A... 22
Appendix B... 24
1 Scope
This Part of GB/T 31467 specifies test procedures for lithium-ion battery packs
and systems specially developed for electric vehicles.
This Part applies to lithium-ion traction battery pack and system that is loaded
on electric vehicles and for the purpose of high energy applications. Ni-MH
traction battery packs and systems of high energy applications may refer to this
Part.
2 Normative references
The following referenced document is indispensable for the application of this
document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 19596 Terminology of electric vehicles
3 Terms and definitions
Terms and definitions defined in GB/T 19596 and the following ones are
applicable to this document.
3.1 Battery electronics
Electronic device that collects and possibly monitors thermal and electric data
of batteries or battery assemblies, and contains electronics for cell balancing, if
necessary.
3.2 Battery control unit. BCU
Electronic device that controls or manages or detects or calculates electric and
thermal functions of the battery system and that provides communication
between the battery system and other vehicle controllers.
3.3 Rated capacity of battery pack / system
Total number of ampere hours that can be withdrawn from a battery and
declared by the manufacturer under specified conditions.
3.4 Battery pack
Mechanical assembly comprising battery cells, battery management modules
(except BCU), and battery box and the corresponding accessories, obtaining
power from outside and exporting electricity.
3.5 Battery system
Energy storage device that includes batteries or battery assemblies or battery
pack(s) as well as appropriate accessories (management system, high-voltage
circuit, low-voltage circuits, thermal management, and mechanical equipment
assembly).
3.6 High energy application
Characteristic of device or application, for which the numerical ratio between
maximum allowed electric power output and electric energy output at a 1C
discharge rate at RT for a battery pack or system is typically lower than 10.
3.7 High power application
Characteristic of device or application, for which the numerical ratio between
maximum allowed electric power output and electric energy output at a 1C
discharge rate at RT for a battery pack or system is typically equal to or higher
than 10.
4 Symbols and abbreviated terms
The following symbols and abbreviated terms apply to this document.
5 General requirements
5.1 General conditions
5.1.1 If not otherwise specified in certain specific test projects, the test shall be
conducted at RT of 25°C±2°C and of which the humidity is 15%~90%.
5.1.2 The necessary documentation for operation and needed interface parts
for connection to the test equipment (i.e. connectors, plugs including cooling)
shall be delivered, and the typical structure of battery pack and system refers
to Appendix A.
5.1.3 When test target ambient temperature changes, test sample needs to
complete the process of adaptation to the environment before test starts. place
it at low temperature for not less than 24h; at high temperature for not less than
16h; or temperature difference between cell ambient temperature and target
temperature shall not exceed 2°C. If test sample contains BCU, it needs to turn
it off during environment adaption.
5.1.4 If battery pack or system is not suitable for some tests due to reasons like
size or weight, etc., it shall use subsystem of battery pack or battery system as
test sample after agreed by both parties for all or some tests. However, this
subsystem shall contain all parts related to vehicle requirements.
5.1.5 The method of adjusting SOC to test target value n%. charge battery pack
or system according to charging method provided by the manufacturer, place it
for 1h and discharge constant current at 1C discharge rate at (100-n)/100h.
After each SOC adjustment, place test sample for 1h before new test starts.
5.1.7 The discharge rate during the test shall be in accordance with the
provisions in this Part. Charging mechanism and cut-off conditions of
discharging shall be provided by the manufacturer. However, these conditions
shall be unified, for example, charging mechanism and discharging mechanism
during cycle performance test shall be same with the provisions of other tests.
5.1.8 Rated capacity of battery pack or system has an important influence on
the testing process. If absolute difference between actual available capacity of
battery (7.1.2.2) and battery rated capacity exceeds 5% of rated capacity, it
shall be clearly stated in the test report, and replace rated capacity by actual
available capacity, as the reference to calculation of charge and discharge
current, and SOC.
5.1.9 Test items, test methods clause number, test conditions for battery pack
and system are shown in Appendix B.
5.1.10 Battery discharge current sign is positive while charge current sign is
negative.
5.2 Accuracy requirements
5.4 Test preparation
5.4.1 Battery pack preparation
Connect high pressure, low pressure and cooling devices of battery pack to test
bench equipment. Activate passive protection of battery pack. Test the working
state and operating parameters of bench detection and control battery pack
based on battery pack manufacturer requirements and test procedures. Ensure
that active protection is activated.
5.4.2 Preparation of battery system
Connect high pressure, low pressure and cooling devices of battery pack as
well as BCU to test bench equipment. Activate active protection and passive
protection of battery system.
5.4.3 Mass and volume of test sample
Use measuring tool to measure dimensions of test sample. Calculate test
sample’s volume, in L. Use weighing apparatus to measure test sample’s mass,
in kg. If test sample contains forced cooling system, it shall be included such as
cooling circuit when measuring or calculating its mass and volume. If cooling
system adopts liquid cooling, the mass of cooling liquid shall be counted. If test
sample’s cooling system is integrated with the vehicle or other cooling systems,
it shall only consider the mass and volume of the part related to test sample. If
it is difficult to measure, it shall use data provided by the manufacturer and data
test reference.
6 Common test cycle
6.1 Preprocessing cycle
6.1.1 Conduct preprocessing cycle for battery pack or system at RT before
official test starts. The procedures are as follows.
6.1.2 If continuous discharging capacity change twice of battery pack or system
is not greater than 3% of rated capacity, it shall be regarded that battery pack
or system has completed the preprocessing. And preprocessing cycle can be aborted.
6.2 Standard cycle
6.2.1 Conduct it according to test procedures specified in this Part during testing
process at RT. It shall follow a sequential order including a standard discharging
process and a standard charging process. The procedures are as follows.
6.2.2 If the interval between standard cycle and a new test is longer than 24h,
it shall re-conduct a standard charging.
6.2.3 The ambient temperature of “standard cycle” mentioned in this Part refers
to room temperature (RT). And the ambient temperature of “standard
discharging” and “standard charging” mentioned separately shall be conducted
according to specific provisions.
7 Basic performances
7.1 Capacity and energy
7.1.1 General conditions
7.1.1.1 Capacity and energy at RT, high temperature and low temperature shall
be detected for battery pack or system.
7.1.1.2 Detect test sample before each charging. Place it for 30 min or till it
reaches to RT.
7.1.1.3 Use constant current discharging during testing process. Stop
discharging till it meets cut-off conditions specified by manufacturer.
7.1.2 Capacity and energy test at RT
7.1.3 Energy and capacity test at high temperature
Battery pack and system require 1C and Imax(T) energy and capacity test at
40°C. Conduct the test according to test procedures in Table 2.
7.1.4 Energy and capacity test at low temperature
Battery pack and system require 1/3C, 1C and Imax(T) energy and capacity test
at 0°C~20°C. Conduct the test according to test procedures in Table 3.
7.2 Power and internal resistance
7.2.1 General conditions
7.2.1.1 Battery pack or system requires power and internal resistance test at
RT, high temperature and low temperature as well as different SOC. The whole
testing process shall be in accordance with 7.2.4.
7.2.1.2 Measure terminal voltage of battery pack or system at the time given in
Table 5.Calculate charging and discharging power and internal resistance
according to 7.2.3.
7.2.2 Power and internal resistance test conditions
7.2.2.1 Power and internal resistance test conditions shall be in accordance
with Table 4 and Figure 1.Data required recording during testing process are
shown in Table 5 and Figure 2.
7.2.2.3 Charging current during charging shall be maintained as constant
current. The current value shall be 0.75I’max (SOC, T, t). If the maximum allowable
pulse charging current of battery pack or system is less than 0.75 I’max (SOC,
T, t), the charging shall be conducted based on the maximum allowable
charging current specified by manufacturer.
7.2.3 Power and internal resistance calculation
7.2.3.1 Discharging internal resistance calculation
7.2.3.2 Charging internal resistance calculation
Calculate charging internal resistance according to equation (13) ~ equation (16).
7.2.3.4 Charging power calculation
Calculate charging power according to equation (28) ~ equation (31).
7.2.4 Test procedures
Power and internal resistance test at RT, high temperature and low temperature
shall be separately conducted according to Table 6, Table 7 and table 8.And
the ones at high temperature and low temperature shall be conducted in
environmental chamber.
7.3 No-load capacity loss
7.3.1 No-load capacity loss refers to the capacity loss during long time shelving
when battery system is under in-car status, including recoverable capacity loss
and non-recoverable capacity loss. The test shall follow Table 9 and Table 10.
7.3.2 This test is only applicable to battery system.
7.3.3 Battery management system shall be powered by an auxiliary power
during shelving, and working condition shall be specified by manufacturer.
7.3.4 In no-load capacity loss test, battery system to be tested shall be in full
power state specified by manufacturer.
7.3.5 No-load capacity loss shall be detected at two different temperatures, i.e., RT and 40°C.
7.3.6 Test period is 168h (7 days) and 720h (30 days).
7.3.7 After shelving is completed, detect no-load capacity and energy loss.
7.4 Capacity loss in storage
7.4.1 Capacity loss in storage refers to capacity loss of battery system in long
time storage. The test shall be conducted according to Table 11.
7.4.2 This test is only applicable to battery system.
7.4.3 In storage, disconnect high temperature connection and low temperature
connection of battery system, turn off cooling system and other necessary
connecting devices.
7.4.4 In storage, battery system SOC is 50% (or negotiated by manufacturer
and customer).
7.4.5 Storage temperature is 45°C.
7.4.6 Storage period is 720h.
7.4.7 After storage is completed, detect the remaining capacity of battery
system so as to determine capacity loss rate of battery system.
7.5 Energy efficiency
7.5.1 Energy efficiency test aims to detect the performance and energy cycle
efficiency of battery system at different temperature and different magnification
during charging.
7.5.2 This test is only applicable to battery system.
7.5.3 Energy efficiency test shall be conducted at three different temperatures,
i.e., RT, 0°C and Tmin (negotiated by manufacturer and customer).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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