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NB/T 33001-2018: Specification for electric vehicle off-board conductive charger
NB/T 33001-2018
NB
ENERGY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.200
K 81
Registration number. 64301-2018
Replacing NB/T 33001-2010
Specification for electric vehicle
off-board conductive charger
ISSUED ON. APRIL 03, 2018
IMPLEMENTED ON. JULY 01, 2018
Issued by. National Energy Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Basic composition ... 10 
5 Classification of charger ... 10 
6 Functional requirements ... 13 
7 Technical requirements ... 17 
8 Marking, packaging, transportation, storage ... 28 
Foreword
This standard replaces NB/T 33001-2010 " Specification for electric vehicle off-
board conductive charger". As compared with NB/T 33001-2010, in addition to
editorial changes, the main technical changes are as follows.
- DELETE the clause 7 “Inspection rules” and clause 8 “Test method” from
the original standard, such information can be found in NB/T 33008.1;
- In the new standard, ADD the clause 5 “Classification of chargers”, where
the chargers are classified from different points of views;
- The clause 8 “Marking, packaging, transportation and storage” of the new
standard corresponds to the clause 9 “Marking” of the original standard;
- In the clause 3 “Terms and definitions” of the new standard, MODIFY the
clause 3 “Terms and definitions” of the original standard; ADD 19 new terms
and definitions;
- In the clause 4 “Basic composition” of the new standard, MODIFY the
clause 4 “Basic composition” of the original standard; ADD the structural
block diagram;
- In the clause 6 “Functional requirements” of the new standard, MODIFY the
“communication function”, “human-machine interaction function”, “input
function”, “metering function” in the clause 5 “Functional requirements” of
the original standard; DELETE the “type of applicable battery”, “setting
method of charging", “low-voltage auxiliary power supply” from the original
standard; ADD the “insulation detection function”, “short-circuit detection
function of DC output circuit”, “vehicle plug lock function”, “pre-charge
function”, “emergency stop function”, “protection function”;
- In the clause 7 “Technical requirements” of the new standard, MODIFY the
“environmental conditions”, “power supply requirements”, “weathering
requirements”, “temperature rise requirements”, “protection requirements”,
“safety requirements”, “electrical insulation performance”, “output voltage
and current"; “charger’s efficiency and power factor”, “electromagnetic
compatibility requirements”, “mechanical strength”, “noise” of the clause 6
“Technical requirements” of the original standard; DELETE the “reliability
index”, “current flow imbalance” from the original standard; ADD the
“current ripple”, “constant power output”, “low-voltage auxiliary power
supply”, “requirements for charger output response”, “start output
overshoot”, “capacity coupling”, “standby power consumption”, “output
voltage, current measurement error”, “charge mode and connection
method”, “control guide circuit”, “charge control timing and flow”,
“mechanical strength”, “characteristics of mechanical switching device”,
Specification for electric vehicle
off-board conductive charger
1 Scope
This standard specifies the terms and definitions, basic compositions,
classification, functional requirements, technical requirements, marking,
packaging, transportation, storage of electric vehicle off-board conductive
charger (hereinafter shortly referred to as charger).
This standard is applicable to the electric vehicle off-board conductive charger
which uses conductive charging method. The maximum rated voltage of the
power supply is 1000V AC or 1500V DC, the maximum rated output voltage is
1500V DC.
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 (12 h+12 h cycle)
GB/T 2423.16-2008 Environmental testing - Part 2. Test methods - Test J
and guidance. Mold growth
GB/T 2423.17-2008 Environmental testing for electric and electronic
products - Part 2. Test method - Test Ka. Salt mist
GB/T 2423.55-2006 Environmental testing for electric and electronic
products - Part 2. Test methods - Test Eh. hammer tests
GB/T 4208 Degrees of protection provided by enclosure (IP code)
3.3
Charging terminal
When an electric vehicle is charged, a part of the off-board conductive
charger which needs to be faced and operated by the charging operators,
which generally consists a charging cable, a vehicle plug, a human-machine
interface, which may also include the components of metering,
communication, control, and the like.
3.4
Split type charger
The charger which structurally separate the power conversion unit from the
charging terminal, which are connected by a cable.
3.5
Integral charger
A charger which accommodates the power conversion unit, the charging
terminal and the like in a cabinet (box), to structurally integrate them.
3.6
Dynamic power allocation
The charger dynamically adjusts the maximum output power of each vehicle
plug according to the vehicle charging demand, its own load status, the
superior monitoring and control command, based on the predetermined
power distribution control strategy.
3.7
Single interface charger
A charger which has only one vehicle plug and can only charge one electric
vehicle at a time.
3.8
Multiple interface charger
A charger which has multiple vehicle plugs that can simultaneously or
sequentially charge multiple electric vehicles, where dynamic power
distribution can be provided between multiple vehicle plugs.
3.9
Standby power
The input power when the charger is in standby mode, which is called
standby power consumption.
3.16
Rated output voltage
In this standard, the maximum output voltage of the charger during normal
operation.
3.17
Rated output current
In this standard, the maximum output current of the charger at the rated
output voltage.
3.18
Maximum output current
In this standard, the maximum output current of the charger at the rated
output power.
3.19
Rated output power
In this standard, the product of the rated output voltage of the charger and
the rated output current.
3.20
DC voltage ripple factor
The ratio of half of the difference between the peak value and the valley
value of the pulsating DC voltage to the average value of the DC voltage.
3.21
Constant power
The status where the charger’s output power is maintained at a constant
value.
circuit. The short-circuit detection of the charger is performed during the
insulation detection phase. When the DC output circuit has a short-circuit fault,
it shall stop the charging process and issue an alarming message.
6.5 Vehicle plug lock function
The vehicle plug of the charger shall be provided with a locking device, whose
function shall comply with.
a) Requirements of 9.6 of GB/T 18487.1-2015.
b) Requirements of 6.3 of GB/T 20234.1-2015.
c) Requirements of Appendix A of GB/T 20234.3-2015.
Under the following conditions, the locking device shall be unlocked and the
voltage at the vehicle’s plug end shall not exceed 60 V before unlocking.
a) Charging cannot be continued due to fault;
b) Charging is completed.
6.6 Precharge function
The charger shall have a precharge function. At the charging-startup phase,
after the electric vehicle closes the vehicle-side DC contactor, the charger shall
detect the battery voltage and determine whether the voltage is normal. When
the charger detects that the battery voltage is normal, it adjusts the output
voltage to the current battery-end's voltage minus 1 V ~ 10 V, then closes the
DC output contactor at the charger side.
6.7 Man-machine interaction function
6.7.1 Display function
The charger shall display the following status information.
a) The operating status indication of the charger. standby, charging, alarm;
b) The charger with manual charging control shall display manual input
information.
The charger should display the following information.
a) The current state of charge of the battery, (SOC), charging voltage,
charging current, charging power;
b) The charging time, the electric quantity charged, the amount charged.
current. The input current overshoot generated during power-on or charging-
startup shall not exceed 10% of the peak value of the rated input current.
6.10.8 When the DC output contactor of the charger is connected, the surge
current (peak value) from the vehicle to the charger or from the charger to the
vehicle shall be controlled below 20 A.
6.10.9 After the vehicle-side contactor is closed during the charging startup
phase, the charger shall detect the vehicle’s battery voltage. When the following
conditions occur, the charger shall stop the startup process and issue an alarm
message.
a) Reverse connection of battery;
b) The absolute value of the difference between the detection voltage and
the battery voltage of communication message is greater than 5% of the
battery voltage of communication message;
c) The detection voltage is less than the minimum output voltage of the
charger or greater than the rated output voltage of the charger.
6.10.10 The charger shall have a dual protection function for the electric
vehicle’s power battery. During the charging process, when the detected output
voltage is greater than the maximum allowable total charging voltage of the
vehicle, or the detected output current is greater than the current demand
current of the vehicle, the charger shall disconnect the DC output within 1 s and
issue an alarm message.
Note. The output voltage or output current as detected by the charger shall take
into account the voltage-regulated accuracy or the current-regulated accuracy
plus the measurement error.
6.10.11 The charger shall have anti-backflow function (such as output plus
diode), to prevent battery current from flowing back.
6.10.12 The charger shall detect the contact adhesion of the DC contactor of
the power supply circuit before charging startup, or otherwise detect the contact
adhesion of the contactor after the DC contactor is disconnected. When it is
detected that any of the main contacts of the DC contactor is adhered, the
charger shall not start charging but issue an alarm message.
6.10.13 During the charging process, when the charger detects a
communication interruption with the electric vehicle’s battery management
system (BMS) or the vehicle controller, the charger shall stop charging and
issue an alarm message.
6.10.14 The charger shall determine the maximum allowable total charging
the provisions of 10.4 of GB/T 18487.1-2015.
7.5.4 Grounding requirements
The grounding of the charger shall meet the following requirements.
a) The metal housing of the charger shall be provided with a grounding
terminal (bolt), the diameter of which shall not be less than 6 mm, and
shall have a grounding mark.
b) The metal door plate, the cover plate, and the like of the charger shall be
connected to the main structural frame of the charger by the use of copper
protective conductor, the cross-sectional area of the protective conductor
shall not be less than 2.5 mm2;
c) All metal casings, partitions of the electrical conductors as well as the
metal housings and metal handles of the electrical devices, etc., shall all
be effectively equipotential-connected, the grounding continuity
resistance shall not be greater than 0.1 Ω;
d) The working grounding and protective grounding in the charger shall be
connected separately to the grounding conductor (copper row). It shall not
connect multiple electrical devices that need to be grounded in series in
one grounding wire.
7.5.5 Electrical isolation requirements
Between the power supply input and the DC output of the charger, it shall use
the electrical isolation protection measures. For the single interface charger, it
shall also use the electrical isolation protection measures between the DC
output interfaces.
7.6 Electrical insulation performance
7.6.1 Insulation resistance
Use a test instrument which has an open circuit voltage of the DC voltage grade
as specified in Table 3, to measure the insulation resistance between each of
the live circuits of the non-electrical connection of the charger and between the
individual live circuits and the ground (metal housing), which shall not be less
than 10 MΩ.
7.6.2 Dielectric strength
Between the live circuits of the non-electrical connection of the charger,
between the independent live circuits and the ground (metal housing), based
on the working voltage, it shall be able to withstand the power frequency AC
voltage for 1 min as specified in Table 3 (DC voltage may also be used. The
7.7.12 Start output overshoot
The charger shall have a soft-start function. During the startup of the voltage-
regulated working, the output voltage overshoot shall not be greater than 5% of
the current setting value. During startup of the current-regulated working, when
the set output DC current is greater than or equal to 30 A, the output current
overshoot shall not be greater than 5% of the current setting value; when the
set output DC current is less than 30 A, the output current overshoot shall not
be greater than 1.5 A.
When the charger resumes the charging state from the suspended state, it shall
meet ...