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GB 42295-2022: [Including 2024XG1] Safety requirement for electric bicycles electrical
GB 42295-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.140
CCS Y 14
Safety requirement for electric bicycles electrical
ISSUED ON: DECEMBER 29, 2022
IMPLEMENTED ON: JANUARY 01, 2024
Issued by: State Administration for Market Regulation;
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 ... 5
4 Requirements ... 7
4.1 General ... 7
4.2 Signs and warnings ... 7
4.3 Wiring, wires and connections ... 8
4.4 Voltage ... 10
4.5 Insulation resistance... 10
4.6 Electric strength... 10
4.7 Heating ... 10
4.8 Protection ... 11
4.9 Temperature and humidity resistance ... 13
4.10 Vibration and shock ... 13
5 Test methods ... 13
5.1 Test conditions ... 13
5.2 Labels and warnings ... 14
5.3 Wiring, wires and connections ... 14
5.4 Voltage measurement ... 15
5.5 Insulation resistance measurement ... 16
5.6 Electric strength test ... 16
5.7 Heating test ... 17
5.8 Protection test ... 18
5.9 Temperature and humidity resistance test ... 25
5.10 Vibration and shock test ... 26
Annex A (informative) Basic rules for communication between battery system and
charger ... 28
Bibliography ... 32
Safety requirement for electric bicycles electrical
1 Scope
This document specifies the requirements for electrical safety signs, warnings, wiring,
wires, connections, voltage, insulation resistance, electric strength, heat generation,
protection, temperature and humidity resistance, vibration and shock. It describes the
corresponding test methods.
This document applies to electric vehicles (hereinafter referred to as the vehicle)
included in power-assisted bicycles defined in QB/T 1714.
This document does not apply to vehicles with an on-board charger.
2 Normative references
The following referenced documents are 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 2423.1, Environmental testing for electric and electronic products - Part 2:
Test methods - Tests A: Cold
GB/T 2423.2, Environmental testing for electric and electronic products - Part 2:
Test methods - Tests B: Dry heat
GB/T 2423.3, Environmental testing - Part 2: Testing method - Test Cab: Damp heat,
steady state
GB/T 3956-2008, Conductors of insulated cables
GB/T 4208, Degrees of protection provided by enclosure (IP code)
GB 4706.1-2005, Household and similar electrical appliances - Safety - Part 1:
General requirements
GB/T 16842-2016, Protection of persons and equipment by enclosures - Probe for
verification
GB 17761, Safety technical specification for electric bicycle
GB/T 22199.1-2017, Valve-regulated lead-acid batteries for moped - Part 1:
Technical conditions
4.3 Wiring, wires and connections
4.3.1 Wiring
Vehicle wiring shall meet the following requirements.
a) The main circuit cables and secondary circuit cables are classified and wired, and
the lines are neat and smooth. Avoid burrs, fins or similar sharp edges that could
cause insulation damage. There is a sheath at the joint part of the conducting wire
and the conductor and it is fixed.
b) The inside of the flexible metal tube is smooth. Avoid wire insulation damage. If
an open coil spring is used to protect the conductor, it must be properly installed
and insulated. For the metal hole through which the insulated wire passes, its
surface is smooth, or it is equipped with a sleeve.
c) Avoid contact with moving parts when routing. If the wire contacts moving parts
or bends during normal use or maintenance, the part where the wire contacts the
moving parts or bends has an insulating sheath. If the movable part moves back
and forth, the wire shall bend and stretch within the maximum angle allowed by
its structure.
d) The connecting wires in the battery box do not cross and overlap. If there is cross
overlap, it shall avoid being squeezed by external pressure. There are insulating
sheaths at the crossovers.
4.3.2 Wires
Wires with a maximum operating current greater than 200 mA in the vehicle circuit
shall be copper conductor wires. The technical requirements shall meet the
requirements of the fifth conductor in Chapter 6 of GB/T 3956-2008.
For wires used in vehicles, the minimum nominal cross-sectional area of single-core
wires is based on the maximum operating current of the circuit (take the larger value
between the actual measured value and the upper limit value of the current-limiting
protection specified by the manufacturer). It shall meet the requirements of the nominal
cross-sectional area corresponding to Table 1.
The minimum nominal cross-sectional area of the wires (except communication and
signal wires) connected inside or between batteries shall not be less than the nominal
cross-sectional area of the single-core wires of the main circuit cables.
NOTE: If the batteries are connected in parallel or between the batteries, the requirement for the
minimum cross-sectional area of the connecting wires at the parallel connection is excluded.
4.8 Protection
4.8.1 Protection against access to contacting live parts
The protection of the vehicle battery system against contacting live parts shall meet the
requirements of Chapter 8 of GB 4706.1-2005. The protection level of the battery
system shall meet the requirements of IP33B specified in GB/T 4208.
4.8.2 Electric shock protection for exposed conductive parts
For circuits with a vehicle voltage higher than 35.0 V (DC) and 16.0 V (AC), all exposed
conductive parts shall be connected. The connection methods are as follows:
a) Wire connection;
b) Connection of screws to the metal frame;
c) The mobile battery system (metal box) can be connected with metal reeds.
The contact resistance connected by metal reed shall be measured by the method
described in 5.3.4. Its value shall meet the requirements of 4.3.4b).
4.8.3 Short circuit protection
Carry out a short-circuit test between the input port and the output port of the battery
system according to the method described in 5.8.3. The short-circuit current shall not
exceed 200 mA. The circuit cut-off time shall not be greater than 500 μs.
4.8.4 Charging protection
4.8.4.1 Main circuit protection under charging state
When the battery system of the vehicle is in the charging state, its output terminal and
the main circuit shall be cut off. The voltage of its output port (connected with the main
circuit) shall be 0 V (DC) and 0 V (AC).
4.8.4.2 Charging overvoltage protection
The vehicle battery system shall have a charging overvoltage protection function. When
the charging voltage of the battery system is greater than the charging overvoltage
protection value specified by the manufacturer, it shall cut off the charging circuit
within 1 s. The accuracy error of the battery system judging the charging overvoltage
shall be ±1%.
4.8.4.3 Charging overcurrent protection
The vehicle battery system shall have a charging overcurrent protection function. When
the charging current value of the battery system is greater than the charging current-
limiting protection specified by the manufacturer, it shall cut off the charging circuit
within 1 s. The accuracy error of the battery system judging the charging overcurrent
shall be ±5%.
4.8.4.4 Misconnection protection of charging port
The charging port of the vehicle battery system shall have misconnection protection
function. When the positive and negative electrodes of the input port of the battery
system are connected incorrectly with the positive and negative electrodes of the output
port of the charger, the charging circuit shall have no current output. After being
connected correctly, the battery system shall be able to charge normally.
4.8.5 Discharge protection
The vehicle battery system shall have discharge overcurrent protection function. During
the discharge process of the battery system, when the total discharge current (main
circuit current plus secondary circuit current) reaches 105% of the maximum operating
current of the vehicle (the larger value between the actual measured value and the upper
limit value of the current limiting protection indicated by the manufacturer), it shall cut
off all discharge circuits within 1 s. The accuracy error of the battery system in judging
the discharge overcurrent shall be ±5%.
The current-limiting protection indicated by the vehicle manufacturer shall be less than
95% of the maximum discharge current indicated by the battery it is equipped with.
4.8.6 Temperature protection
The vehicle battery system shall have a temperature protection function. When the
charging operating temperature of the battery system is higher than the maximum
charging operating temperature or lower than the manufacturer’s expressly indicating
minimum charging operating temperature, and when the discharge operating
temperature of the battery system is higher than the maximum discharge operating
temperature or lower than the minimum discharge operating temperature indicated by
the manufacturer, it shall cut off the charging or discharging circuit within 30 s.
4.8.7 Abnormal temperature alarm
The vehicle shall have an alarm function for abnormal temperature of the battery system.
When the internal temperature of the battery system or the temperature of a single
battery reaches the limit value, the vehicle or the battery system shall send out an alarm
sound not lower than 85 dB(A) within 30 s.
4.8.8 Power failure of protective device
When the protective device fails in any state of the vehicle using the lithium-ion battery
system, it shall be able to immediately cut off the internal connection of the battery, and
the connection cannot be automatically restored.
4.8.9 Mutual recognition and collaborative charging
current-limiting protection of the vehicle's main circuit or secondary circuit indicated
by the manufacturer with the larger value of the measured value.
Measure and calculate the cross-sectional area of connecting wires (except
communication and signal wires) inside or between batteries. Compare the nominal
cross-sectional area of the single-core conductor of the main circuit conductor.
5.3.3 Connection test
The vehicle wire connection test method is as follows:
a) Connector connection: test with tensioner;
b) Terminal connection: visual inspection and torque wrench test.
5.3.4 Contact resistance measurement
Use a low resistance tester with an accuracy of ±0.2% to test vehicle contact resistance.
Measure as follows:
a) For contact resistance measurement with terminal connections. Connect the low
resistance tester to both ends of the post. Under the current intensity of 5.0 A/mm2,
after reaching thermal equilibrium, measure the contact resistance value.
Compare with the resistance value of the wire of the same length in the contact
part of the wiring.
b) For contact resistance measurement connected with plug-in components or switch
components. After the connector has been plugged and unplugged 10 times or the
switch has been closed 10 times, connect the low resistance tester to both ends of
the connector or switch. Under the current intensity of 5.0 A/mm2, after reaching
thermal equilibrium, measure the contact resistance value.
5.4 Voltage measurement
The vehicle voltage is measured with a voltage measuring instrument according to the
following method:
a) Take the main metal parts of the vehicle (such as the frame, handlebars, hangers
and other parts that the human body may come into contact with) as the reference
point. Measure and record the voltage value of any circuit other than the main
circuit and the circuit directly connected with the battery.
b) Turn on the electric door lock. Measure and record the voltage value of the battery
system output port (connected to the main circuit). Turn off the electric door lock.
Measure and record the voltage value of the battery system output port (connected
with the main circuit).
5.5 Insulation resistance measurement
Use an insulation resistance meter with a DC voltage of 500 V to measure the insulation
resistance value of the electrical components of the vehicle. Measure the insulation
resistance value of each electrical component as follows.
a) Battery system. Connect one test lead of the insulation resistance meter to the
positive and negative electrodes of the input terminal and output terminal of the
battery system, respectively. For the other test lead, if the test piece is movable,
connect with its case. If the test piece is immovable, it shall be connected to the
frame, handlebar and motor casing, respectively.
b) Protective device. Connect one test lead of the insulation resistance meter to the
positive and negative electrodes of the input terminal and output terminal of the
protective device, respectively. The other test lead is connected with its case.
c) Electric motor. Connect a test-lead of the insulation resistance meter to the casing
of the motor. The other test lead is connected with its armature winding and Hall
line, respectively.
d) Controller. Short connect all leads of the controller. Connect a test lead of an
insulation resistance meter to its case or heat sink. The other test lead is connected
with its shorted lead.
e) Power-off brake handles, switches and electric door locks. Connect a test lead of
the insulation resistance meter to the terminal of the tested object. For the other
test lead, if the test piece is measured separately, connect with its case or heat sink.
If the test piece is installed on the vehicle, it is connected to the frame, handlebar
and motor casing, respectively. When the switch of the test piece is off, connect
the two test leads of the insulation resistance meter to the positive and negative
electrodes of the input terminal and the output terminal of the test piece,
re...