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NB/T 33020-2015: Technical specification for charger of electric vehicle battery swap station
NB/T 33020-2015
NB
ENERGY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.200
K 81
Registration number. 49594-2015
Technical specification for charger of
electric vehicle battery swap station
ISSUED ON. APRIL 02, 2015
IMPLEMENTED ON. SEPTEMBER 01, 2015
Issued by. National Energy Administration
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Basic composition ... 5 
5 Functional requirements ... 6 
6 Technical requirements ... 7 
7 Test methods ... 15 
8 Inspection rules ... 23 
9 Marking, packaging, transportation and storage ... 25 
Technical specification for charger of
electric vehicle battery swap station
1 Scope
This standard specifies the basic composition, functional requirements,
technical requirements, test methods, inspection rules, and marking, packaging,
transportation and storage for charger of electric vehicle battery swap station.
This standard is applicable to the off-board charger which charges the battery
swap station of electric vehicle (hereinafter referred to as the charger).
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 2423.1-2008 Environmental testing - Part 2. Test methods - Tests A.
Cold
GB/T 2423.2-2008 Environmental testing - Part 2. Test methods - Tests B.
Dry heat
GB/T 2423.4-2008 Environmental testing for electric and electronic products
- Part 2. Test method - Test Db. Damp heat, cyclic ( 12h+12h cycle)
GB/T 2900.1 Electrotechnical terminology - Fundamental terms
GB 4208-2008 Degrees of protection provided by enclosure (IP code)
GB 9254 Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement
GB/T 13384 General specifications for packing of mechanical and electrical
product
GB/T 16821-2007 General test methods of power supply equipment for
telecommunications
GB 17625.1 Electromagnetic compatibility - Limits - Limits for harmonic
current emissions (equipment input current ≤ 16 A per phase)
GB/Z 17625.6 Electromagnetic compatibility - Limits - Limitation of emission
of harmonic currents in low-voltage power supply systems for equipment
with rated current greater than 16A
GB/T 17626.2-2006 Electromagnetic compatibility (EMC) - Testing and
measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3-2006 Electromagnetic compatibility - Testing and
measurement techniques - Radiated radio-frequency electromagnetic field
immunity test
GB/T 17626.4-2008 Electromagnetic compatibility - Testing and
measurement techniques - Electrical fast transient/burst immunity test
GB/T 17626.5-2008 Electromagnetic compatibility - Testing and
measurement techniques - Surge immunity test
GB/T 18487.1-2001 Electric vehicle conductive charging system - Part 1.
General requirements
GB/T 29317 Terminology of electric vehicle charging/battery swap
infrastructure
NB/T 33008.1-2013 Inspection and test specifications for electric vehicle
charging equipment - Part 1. Off-board charger
3 Terms and definitions
The terms and definitions as defined in GB/T 2900.1 and GB/T 29317 as well
as the following terms and definitions apply to this document.
3.1
Battery electrical control unit
An electronic device in the battery swap station for collecting and monitoring
electrical and thermal data of a single battery or battery module, and having
a communication function. Electronic components that achieve uniformity of
the individual cells can also be included if necessary.
4 Basic composition
The basic structure of the charger includes a power unit, a control unit, an
electrical interface, a human-machine interface, and the like.
undervoltage occurs, the charger shall be able to automatically cut off the DC
output and issue an alarm.
6.8.2 The charger shall have overvoltage and short circuit protection on the DC
output side. When there is DC output over-current or over-voltage, the charger
shall be able to automatically cut off the DC output and send an alarm signal;
when the DC output is short-circuited, the charger shall automatically enter the
current-limit output state.
6.8.3 The charger shall have an over temperature protection function. When
the power unit is over temperature, the charger shall be able to automatically
cut off the DC output and send an alarm signal.
6.8.4 During the charging process, the charging voltage and charging current
of the battery swap station shall not exceed the allowable value.
6.8.5 During the charging process, when the voltage and temperature of the
battery exceed the allowable value, the charger shall stop charging.
6.8.6 During the charging process, when it is detected that the communication
with the battery electronic control unit is interrupted, the charger shall stop
charging.
6.8.7 The charger shall have the battery polarity detection function. When the
charger is connected to the battery swap station, the DC output of the charger
is allowed to be connected to the power circuit of the battery swap station after
detecting the correct polarity of the battery.
6.8.8 The charger shall have the battery connection confirmation function.
When the charger is connected to the battery swap station, the charger is
allowed to start the charging process after detecting that the battery is
connected correctly; when the charger detects that the connection with the
battery swap station is abnormal, it shall immediately cut off the DC output.
6.8.9 After the charging is completed, the DC output of the charger and the
power circuit of the battery swap station shall be disconnected.
6.8.10 The charger shall have obvious status indication and text prompts to
prevent personnel from mishandling.
6.9 Output performance requirements
6.9.1 Output voltage
In accordance with the voltage range of the battery swap station, the rated
output voltage of the charger can be divided into 5 levels.
30V ~ 50V, 50V ~ 70V, 70V ~ 100V, 100V ~ 250V, 250V ~ 500V.
voltage;
b) When the charger is running in the constant voltage state, if the output DC
current exceeds the current limit setting value, it shall immediately enter
the current limiting state to automatically limit the increase of its output
current.
6.10 Startup performance requirements
6.10.1 Soft start time
Under the rated input voltage and the output 100% rated load, the process time
range from the start of the charger to the output DC voltage rising to the rated
setting is (3 ~ 8) s.
6.10.2 Input surge current
Under the rated input voltage and output 100% rated load, the peak value of
the input shock (surge) current caused by the start-up process of the charger
shall not exceed 120% of the rated input current.
6.10.3 Output overshoot voltage
Under the rated input voltage and output no-load, 50% rated load, 100% rated
load, the peak value of the output overshoot voltage caused by the start-up
process of the charger shall not exceed 110% of the steady-state output voltage.
6.11 Efficiency
At the rated input voltage, when the output power is 50% ~ 100% of the rated
power, the efficiency of the charger shall not be less than 90%.
6.12 Power factor
Under the rated input voltage, when the output power is 50% ~ 100% of the
rated power, the power factor of the charger shall not be less than 0.90.
6.13 Noise
Under the rated load and the condition that ambient noise is not more than 40
dB, at a point 1 m from the horizontal position of the charger, the measured
noise maximum value shall not be greater than 65 dB.
6.14 Temperature rise
Under normal test conditions, when the AC input is rated and it is continuously
operated under rated load for a long period of time, the temperature rise of each
heating component and each part inside the charger shall not exceed the
requirements of Table 4.
It is tested in accordance with the method specified in 5.6.6 of NB/T 33008.1-
2013.
7.7.7 Pressure limiting characteristic test
The charger is connected to the load and set to operate in a constant current
state. The load is adjusted to increase the output voltage, when the output DC
voltage reaches the voltage limit setting value, the charger shall automatically
reduce the output current, thereby limiting the increase of the output DC voltage;
when the output DC voltage is adjusted back below the voltage limit setting
value, the charger resumes the constant current state operation.
7.7.8 Current limiting characteristic test
The charger is connected to the load and set to operate under constant voltage
state. The load is adjusted to increase the output current, when the output DC
current reaches the current limit setting value, the charger shall automatically
reduce the output voltage, thereby limiting the increase of the output DC current;
when the output DC current is adjusted back below the current limit setting
value, the charger resumes the constant voltage state operation.
7.8 Start performance test
7.8.1 Soft start time test
It is tested in accordance with the method specified in 5.6.1 of GB/T 16821-
2007.
7.8.2 Input impulse current test
It is tested in accordance with the method specified in 5.6.2 of GB/T 16821-
2007.
7.8.3 Output overshoot voltage test
It is tested in accordance with the method specified in 5.6.4 of GB/T 16821-
2007.
7.9 Efficiency test
It is tested in accordance with the method specified in 5.6.7 of NB/T 33008.1-
2013.
7.10 Power factor test
It is tested in accordance with the method specified in 5.6.8 of NB/T 33008.1-
2013.
7.11 Noise test
monitoring system at any time to obtain the charging parameters and charging
real-time data instantly.
7.16.4 Display function test
The charger is connected to the battery swap station for charging operation, the
display function of the charger is checked under various conditions. The charger
shall be able to display the relevant information specified in 5.3.1, the display
characters are clear and complete, and free from defect.
7.16.5 Input function test
Set the charging parameters of the charger manually and check that the charger
shall respond correctly.
7.16.6 Charging status indication function test
Connect externally the charging status indication port of the charger to the
signal indicator, start the charger to perform charging operation. Control the
charger to enter three status. standby, charging, and full charging, the
corresponding signal indicator shall indicate correctly.
7.17 Safety protection test
7.17.1 Input overvoltage protection test
The charger is connected to the load and set to operate under rated load
conditions. When adjusting the input power supply voltage to exceed the input
overvoltage protection action value, the charger input overvoltage protection
shall be activated, to immediately cut off the DC output and issue an alarm.
7.17.2 Input undervoltage protection test
The charger is connected to the load and set to operate under rated load
conditions. When adjusting the input power supply voltage to be lower than the
input undervoltage protection action value, the charger input undervoltage
protection shall be activated, to immediately cut off the DC output and issue an
alarm.
7.17.3 Output overvoltage protection test
Disconnect the voltage feedback adjustment circuit, connect the charger to the
load, and set it to run in the constant current state. When the load is adjusted
so that the output DC voltage exceeds the overvoltage protection action value,
the charger output overvoltage protection shall be started to immediately cut off
the DC output and issue an alarm.
7.17.4 Output short circuit protection test
automatically restored.
c) The function or performance is temporarily reduced or lost, but requires
operator intervention or system reset.
d) Reduction or loss of self-restoration function due to damage of element or
software or data loss.
7.18.2 Qualification judgment
a) If the result of 7.18.1 a) or b) appears in the test, it is judged as qualified;
b) If the result of 7.18.1 c) or d) appears in the test, it is judged as disqualified.
7.18.3 Electrostatic discharge immunity test
The electrostatic discharge immunity test is performed in accordance with the
method specified in GB/T 17626.2-2006.
7.18.4 Radio frequency electromagnetic field radiated immunity test
The radio frequency electromagnetic field radiated immunity test is performed
in accordance with the method specified in GB/T 17626.3-2006.
7.18.5 Electrical fast transient burst immunity test
The electrical fast transient burst immunity test is performed in accordance with
the method specified in GB/T 17626.4-2008.
7.18.6 Surge (impact) immunity test
The surge (impact) immunity test is performed in accordance with the method
specified in GB/T 17626.5-2008.
7.19 Electromagnetic emission test
7.19.1 Working conditions
In the electromagnetic emission test, the AC input voltage is the rated value,
the charger operates in the constant voltage state, the DC output voltage is the
rated value, the output current is the rated value (resistive load) and 0.5 times
the rated value (resistive load).
7.19.2 Qualification judgment
It is judged as qualified if the electromagnetic emission limit does not exceed
the rated value and shall not exceed the limits specified in Tables 5 and 6. If it
exceeds the specified value, it is judged as disqualified.