GB/T 34668-2023 English PDF (GB/T34668-2023)

GB/T 34668-2023: Safety requirements and test methods for electrical self-balancing vehicles
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GB/T 34668-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.040.30
CCS J 28
Replacing GB/T 34668-2017
Safety Requirements and Test Methods for Electrical Self-
balancing Vehicles
ISSUED ON: SEPTEMBER 7, 2023
IMPLEMENTED ON: APRIL 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Test Conditions ... 6
5 General Safety Requirements ... 8
6 Electrical Safety ... 11
7 Mechanical Safety ... 13
8 Environmental Reliability ... 13
9 Test Methods ... 14
10 Marking and Description ... 20
Appendix A (informative) Protective Circuit and Safety Analysis ... 24
Bibliography ... 26
Safety Requirements and Test Methods for Electrical Self-
balancing Vehicles
1 Scope
This document defines the terms and definitions of electrical self-balancing vehicles, specifies
the test conditions, general safety requirements, electrical safety, mechanical safety,
environmental reliability, marking and description requirements, and describes the
corresponding test methods.
This document is applicable to the design, production and sales of electrical self-balancing
vehicles that use batteries as the power source.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB 3565.2-2022 Safety Requirements for Bicycles - Part 2: Requirements for City and
Trekking, Young Adult, Mountain and Racing Bicycles
GB/T 4208-2017 Degrees of Protection Provided by Enclosure (IP code)
GB 4706.18-2014 Household and Similar Electrical Appliances - Safety - Particular
Requirements for Battery Chargers
GB 4943.1-2022 Audio / Video, Information and Communication Technology Equipment - Part
1: Safety Requirements
GB/T 5169.16-2017 Fire Hazard Testing for Electric and Electronic Products - Part 16: Test
Flames - 50 W Horizontal and Vertical Flame Test Methods
GB/T 12350 Safety Requirements of Small-power Motors
GB/T 40559 Lithium Ion Cells and Batteries Used in Self-balancing Vehicle - Safety
Requirements
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 electrical self-balancing vehicle
A wheeled manned mobile platform that is based on the inverted pendulum model and the
principle of static instability, and is equipped with a rechargeable electric drive system, thus
maintaining dynamic balance in an autonomous or manual mode of operation.
NOTE: the electrical self-balancing vehicle is referred to as the self-balancing vehicle for short.
3.2 safety alarm
An alarm (such as: sound, light and vibration, etc.) that may be clearly noticed by the user after
being sent to the user, when an electrical self-balancing vehicle detects internal faults (such as:
abnormal battery voltage and balance control unit failure) or dangerous driving actions or
abnormal working conditions of the vehicle.
3.3 footrest tilting function
The function enabled for limiting the user to continue driving in case of overspeed, low-battery
driving or overload driving detected in an electrical self-balancing vehicle, thus protecting the
safety of the user, by automatically tilting up the front end of the footrest on the self-balancing
vehicle.
3.4 enclosure
A shell that provides the type and degree of protection suitable for the intended use.
[source: GB 4943.1-2022, 3.3.2.2]
3.5 crash
A state where the electrical self-balancing vehicle’s posture or speed changes significantly so
that it cannot continue to actively maintain the balance when the self-balancing vehicle is driven.
3.6 electrolyte leakage
Visible leakage of liquid electrolyte.
[source: GB/T 28164-2011, 1.3.9]
3.7 active protective device
An electrically propelled protective device.
NOTE: such as: battery management systems and control integrated circuits, etc.
4 Test Conditions
4.1 Test Roads
The test roads shall meet the following conditions:
a) The test shall be carried out on cement or asphalt pavement. Pavement shall be smooth,
dry and clean, with a good adhesion coefficient;
b) The test area shall be set up on the test road. The test channel in the test area shall not
be less than 1 m in width. There shall be an auxiliary driving zone long enough and a
secondary zone that ensures safe parking on both ends of this test area, where it is
able to drive in both directions.
4.2 Drivers
The drivers shall meet the following conditions:
a) If the maximum load of the product is greater than or equal to 75 kg, the total weight
of the driver and its equipment shall be 75 kg; when the total weight is less than 75
kg, counterweight shall be applied. If the maximum load of the product is less than
75 kg, then, the total weight of the driver and its equipment shall be equal to the
maximum load of the product;
b) Drivers shall master the driving skills and be familiar with the test methods;
c) Drivers shall be equipped with helmets, knee pads, elbow pads and other necessary
protective equipment;
d) Drivers shall drive the test vehicles according to the operation methods specified by
the manufacturer. Throughout the test, drivers shall try to keep the driving position
without significant changes and avoid the operations which are not allowed by the
manufacturer.
4.3 Test Environment
Unless otherwise required by the test items, the test environment shall meet the following
conditions:
a) The temperature shall be within the range of nominal operating temperature of the
electrical self-balancing vehicle. Unless otherwise specified, the room temperature
specified in this document shall be (25  5) °C;
b) Relative humidity shall not be greater than 75%;
c) Atmospheric pressure shall be within the range of 86 kPa to 106 kPa;
d) During the test, the average wind speed shall not be greater than 3 m/s; the
instantaneous wind speed shall not be greater than 5 m/s;
e) If it is necessary to test outdoors, rain, snow and other weather shall be avoided.
5.4.1 Overspeed protection
The electrical self-balancing vehicle shall have such protection functions as continuous safety
alarm beyond the speed limits and continuous tilting function or the like, so as to restrict the
user from continued acceleration, thus protecting user safety.
5.4.2 Low-battery protection
The electrical self-balancing vehicle shall be capable of providing low-battery protection, that
is, when the power of the electrical self-balancing vehicle’s battery pack is lower than the
minimum power required by the manufacturer for safe driving, the self-balancing vehicle shall
have such protection functions as continuous safety alarm and continuous tilting function or the
like, so as to restrict the user from continued driving.
5.4.3 Grade parking performance and protection
The electrical two-wheeled self-balancing vehicle shall have grade parking performance and
protection function. After tested according to the method specified in 9.1.3, the electrical self-
balancing vehicle shall meet either of the following two states:
a) The self-balancing vehicle gives no safety alarm and without any power failure;
meanwhile, its motor has no loss of energy;
b) The self-balancing vehicle enables such protection functions as continuous safety
alarm and continuous tilting function or the like, so as to restrict the user from
continued driving.
5.4.4 Crash protection
The electrical self-balancing vehicle shall be capable of providing crash protection to prevent
the self-balancing vehicle from hurting the user or the third party when its wheel(s) continue(s)
to rotate after crash. After tested according to the method specified in 9.1.4, the wheel(s) of the
electrical self-balancing vehicle shall be able to stop rotating within 5s (including 5s) after crash.
5.4.5 Overcharge protection with energy recovery function
For the electrical self-balancing vehicle with energy recovery function, certain protective
measures shall be taken to prevent energy recovery from overcharging the battery or battery
pack during downhill or deceleration. Safety alarms and tilting function or other similar
protective measures shall be triggered before overvoltage of the battery or battery pack. In
addition, the self-balancing vehicle shall not cut off the discharge circuit due to overvoltage
protection of the battery or battery pack. When tested according to 9.1.5, the electrical self-
balancing vehicle shall not catch fire or explode. Meanwhile, there shall be no rupture or
electrolyte leakage on the enclosure.
5.4.6 Speed-limit alarm for battery pack in low battery
When tested according to 9.1.6, the electrical self-balancing vehicle shall trigger the safety
alarms and tilting function or other similar protective measures when the battery pack is in low
battery. Before triggering the protection function, the self-balancing vehicle shall not cut off the
discharge circuit due to low-battery protection of the battery pack. In addition, the self-
balancing vehicle shall not catch fire or explode. Meanwhile, there shall be no rupture or
electrolyte leakage on the enclosure.
5.4.7 Charge locking
When tested according to 9.1.7, the electrical self-balancing vehicle shall be unable to be turned
on during charging. If it is able to be turned on, protective measures shall be taken to limit its
normal driving, for example, non-powered wheel rotation.
5.4.8 Anti-spinning protection
The electrical self-balancing vehicle weighing less than 18 kg shall be tested according to 9.1.8.
After startup, the self-balancing vehicle’s wheel(s) shall not continue to spin or rotate for more
than 5 s after lifted up using the designed handle assembly.
5.5 Devices
5.5.1 Battery and battery pack
The safety of batteries and battery packs for the electrical self-balancing vehicles using lithium-
ion batteries and battery packs shall comply with the stipulations of GB/T 40559. Other types
of batteries and battery packs shall comply with the stipulations of relevant national standards.
5.5.2 Charger
The safety requirements for the chargers or power supplies of the electrical self-balancing
vehicles shall meet the requirements of GB 4943.1-2022 or GB 4706.18-2014 and be
compatible with the battery systems of the electrical self-balancing vehicles. Compliance shall
be checked by reviewing the battery system and charger specifications and the tests in this
document.
The connectors, which are provided with the chargers and connected to the charging ports on
the self-balancing vehicles for charging, shall be designed to prevent misalignment and reverse
polarity.
5.5.3 Motor
The motors for the electrical self-balancing vehicles shall comply with the requirements of
GB/T 12350 and the motor overload test specified in 9.2.1.
If the motors for the electrical self-balancing vehicles are beyond the scope of application in
GB/T 12350, then, such motors shall comply with both the motor overload test specified in
9.2.1 and the motor locked-rotor test specified in 9.2.2.
5.5.4 Fuse
6.2 Wiring
Check the cables in the following order at room temperature, and the electrical self-balancing
vehicle shall comply with the following requirements.
a) Cables shall be smooth and free of sharp edges with good insulation.
b) Cables shall be protected from contact with burrs, heat sinks or similar sharp edges
that may affect insulation. The surfaces of the metal holes through which the cables
pass shall be smooth enough, or cables shall be equipped with sleeves.
c) Cables shall be securely fastened to prevent contact between the cables and the
moving parts. Where necessary, other mechanical fixings may be added.
Detachable parts of an electrical self-balancing vehicle, which will be removed during normal
use or maintenance of the equipment, shall not cause undue pressure on the electrical
connections and internal conductors, including the conductors that maintain earthing continuity.
6.3 Short-circuit Safety
After tested according to the method specified in 9.2.3, the self-balancing vehicle shall not catch
fire or explode. Meanwhile, there shall be no rupture or electrolyte leakage on the enclosure.
NOTE: if the self-balancing vehicle’s battery pack has passed the short circuit test, and in the case
that according to the characteristics of the tested self-balancing vehicle, it has been
evaluated that there is no difference between the short circuit test of the entire self-
balancing vehicle and that of the battery pack, it may be unnecessary to carry out the short
circuit test specified in this document.
6.4 Heating
The materials that are suitable for the structures of the components and the electrical self-
balancing vehicle shall be selected, so that the temperature of the self-balancing vehicle will
not exceed its temperature limit when operating under normal load. After performing the test
according to the method specified in 9.2.4, the measured temperature limits of the materials for
the self-balancing vehicle and the components shall meet the requirements of 5.4.1.4.3 in GB
4943.1-2022; the measured temperature limits of the accessible parts in the accessible area of
the user shall meet the requirements of 9.3 in GB 4943.1-2022. In addition, during the test, the
electrical self-balancing vehicle shall not catch fire or explode. Meanwhile, there shall be no
rupture or electrolyte leakage on the enclosure.
6.5 Dielectric Strength
The electrical self-balancing vehicles or their components, which are directly connected to the
AC grid, shall have adequate dielectric strength and be tested according to the method specified
in 9.2.5.
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