GB/T 33339-2016 PDF in English
GB/T 33339-2016 (GB/T33339-2016, GBT 33339-2016, GBT33339-2016)
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Vanadium flow battery system -- Test method
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Standards related to (historical): GB/T 33339-2016
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GB/T 33339-2016: PDF in English (GBT 33339-2016) GB/T 33339-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.070
K 82
Vanadium flow battery system – Test method
ISSUED ON: DECEMBER 13, 2016
IMPLEMENTED ON: JULY 1, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Test items ... 5
5 Test preparation ... 5
6 Test conditions ... 6
7 Measuring instruments ... 6
8 Test methods ... 8
9 Test reports ... 18
Annex A (Informative) Test reports ... 19
Vanadium flow battery system – Test method
1 Scope
This Standard specifies the terms and definitions, test items, test preparation, test
conditions, measuring instruments and test methods for the testing of vanadium flow
battery system (hereinafter referred to as battery system).
This Standard applies to battery systems of all scales and applications.
This Standard does not include electromagnetic compatibility (EMC) test.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
GB/T 29840-2013, Vanadium flow battery – Terminology
NB/T 42040-2014, General specification for vanadium flow battery
ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the
expression of uncertainty in measurement
3 Terms and definitions
For the purposes of this document, the following terms and definitions, and those given
in GB/T 29840-2013 and NB/T 42040-2014, apply. For the convenience of use, some
definitions and terms of GB/T 29840-2013 are listed below.
3.1
vanadium flow battery; VFB
Energy storing device which achieves mutual transformation of electric energy and
chemical energy through the electrochemical reaction of vanadium ions in different
valence states in positive and negative electrolyte. It is also called vanadium flow
battery.
where,
κstack – the range coefficient;
ηstack, max – the maximum value of energy efficiency in all stacks of battery system,
in %;
ηstack, max – the minimum value of energy efficiency in all stacks of battery system,
in %;
ηstack, avg – the average value of energy efficiency in all stacks of battery system, in %.
8.1.1.2 Voltage range test
Voltage range test shall be carried out as follows:
a) charge the battery system to 100% SOC;
b) discharge the battery system at rated power;
c) measure and record voltage Udn of each stack at regular intervals. Until the end
of discharge, test points shall not be less than 5. The time interval for each test
point shall be kept consistent;
d) continue to discharge the battery system until discharge end-off condition;
e) charge the battery system at rated power;
f) measure and record voltage Ucn of each stack at regular intervals. Until the end
of discharge, test points shall not be less than 5. The time interval for each test
point shall be kept consistent;
NOTE 1: It is recommended that the SOC at the end of discharge is 20% and the SOC
at the end of charge is 80%.
NOTE 2: The measurement time interval is as agreed on by user and manufacturer.
g) calculate the voltage ranges during the charging process and discharging
process of stack in accordance with Equation (3) and make data tables.
NOTE 3: For a large-scale battery system, considering the operability of test, element
cell systems can be selected to replace the battery system entireties to carry out test.
where,
ΔUstack, n – the voltage range of the nth test point of battery system;
Maximum charge power test of the battery system is carried out as follows:
a) maintain the battery system at 90% SOC;
b) charge the battery system at the constant maximum power, with the charge time
not less than 10 min;
c) record the charge power of step b).
8.1.4.2 50% SOC maximum charge power test
Maximum charge power test of the battery system is carried out as follows:
a) maintain the battery system at 50% SOC;
b) charge the battery system at the constant maximum power, with the charge time
is not less than 10 min;
c) record the charge power of step b).
8.1.4.3 10% SOC maximum charge power test
Maximum charge power test of the battery system is carried out as follows:
a) maintain the battery system at 10% SOC;
b) charge the battery system at the constant maximum power, with the charge time
not less than 10 min;
c) record the charge power of step b).
8.1.5 Rated watt-hour capacity test
Rated watt-hour capacity test of the battery system is carried out as follows:
a) charge the battery system to 100% SOC;
b) discharge the battery system at rated power to 30% SOC;
c) continue to discharge at 30% of rated power until discharge end-off condition;
d) record the SOC of the battery system during the discharging process;
e) repeat steps a) ~ d) for three times;
f) record the discharge watt-hour capacity and auxiliary energy consumption of the
last charge cycle of battery system;
g) calculate the rated discharge watt-hour capacity of the battery system in
c) charge the battery system at rated power until charge end-off condition;
d) discharge the battery system at rated power until discharge end-off condition;
e) record the SOC of the battery system during charge and discharge;
f) repeat steps c) ~ e) for three times;
g) record the charge-discharge watt-hour capacity and auxiliary energy
consumption of 3 charge-discharge cycles;
h) calculate the battery system energy efficiency of 3 charge-discharge cycles in
accordance with Equation (5).
NOTE: For a large-scale battery system, considering the operability of test, element cell
systems can be selected to replace the battery system entireties to carry out test.
where,
η – the rated energy efficiency of battery system, in %;
Esd – the discharge watt-hour capacity of the battery system which is recorded
by measuring instruments, in W·h;
Wsd – the auxiliary energy consumption during the discharging process of the
battery system which is recorded by measuring instruments, in W·h;
Esc – the charge watt-hour capacity of the battery system which is recorded by
measuring instruments, in W·h;
Wsc – the auxiliary energy consumption during the charging process of the
battery system which is recorded by measuring instruments, in W·h.
NOTE 2: For a battery system whose auxiliary energy consumption is supplied by flow
battery itself, the discharge watt-hour capacity recorded by measuring instruments is the
watt-hour capacity of battery system, i.e...
8.1.8 Capacity retention ability test
Battery system capacity retention ability test is carried out as follows:
a) charge the battery system to 100% SOC;
b) discharge the battery system at rated power until discharge end-off condition;
8.1.11.2 Discharge overload ability test
Battery system discharge overload ability test is carried out as follows:
a) charge the battery system to 100% SOC;
b) discharge the battery system at a power not lower than 1.1 times of the rated
power, with the discharging time not less than 10 min;
c) repeat steps a) ~ b) for 3 times.
8.1.12 State parameter accuracy test
State parameter accuracy test is carried out as follows:
a) install instruments for measuring voltage, current and temperature where the
battery system is provided with sensors of voltage, current and temperature;
b) turn on the power switch of the battery management system;
c) the battery management system acquires the signals feedbacked by the sensors;
d) calculate the deviation of the data acquired in step c) from the data measured by
measuring instruments.
8.1.13 SOC accuracy test
8.1.13.1 Discharging process SOC accuracy test
Discharging process SOC accuracy test is carried out as follows:
a) charge the battery system to 100% SOC;
b) discharge the battery system at the constant power until discharge end-off
condition;
c) record once the SOC value displayed by the battery management system every
10% SOC during discharge, i.e. SOCn, d;
NOTE: The range of the SOC recorded is 10% ~ 90%.
d) record one by one the discharged watt-hour capacity En, d of the battery system
at each time of displaying SOC until discharge end-off condition;
e) calculate the actual SOC value and SOC accuracy during the discharging
process in accordance with Equations (7) and (8).
SOCr, n, c – the actual SOC value of the battery system in the charging process;
En, c – the charged watt-hour capacity of the battery system at the nth time of
displaying SOC, in W·h;
Emax, c – the maximum watt-hour capacity of battery system which can be charged,
in W·h.
where,
σsoc,c – the SOC accuracy of the battery system during the charging process;
SOCr, n, c – the actual SOC value of the battery system during the charging process;
SOCn, c – the SOC value displayed by the battery management system during the
charging process.
8.1.14 Protection function test
Fault diagnosis and handling function test is carried out as follows:
a) start the battery system and maintain it in the operating state;
b) input fault analog signals into the battery system such as over-discharge, over-
discharge, undervoltage, overvoltage, electrolyte excessively high temperature,
electrolyte excessively low temperature and electrolyte leakage;
c) monitor the functional data displayed by the human-computer interfaces of the
battery system.
8.2 Safety test
8.2.1 Over-charge test
As specified in 5.10 of NB/T 42040-2014.
8.2.2 Over-discharge test
As specified in 5.11 of NB/T 42040-2014.
8.2.3 Flame retardation test
As specified in 5.14 of NB/T 42040-2014.
8.2.4 Hydrogen leakage test
After confirming that safety measures are ensured, carry out the battery system
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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