GB/T 36972-2018 English PDF (GBT36972-2018)

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GB/T 36972-2018: Lithium-ion battery for electric bicycle
GB/T 36972-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.140
Y 14
Lithium-ion battery for electric bicycle
ISSUED ON: DECEMBER 28, 2018
IMPLEMENTED ON: JULY 01, 2019
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 Symbols and type designation ... 5
5 Requirements ... 5
6 Test methods ... 9
7 Inspection rules ... 18
8 Marking, packaging, transportation and storage ... 22
Lithium-ion battery for electric bicycle
1 Scope
This Standard specifies the terms and definitions, symbols and type designation,
requirements, test methods, inspection rules, as well as marking, packaging,
transportation and storage of lithium-ion battery for electric bicycle.
This Standard applies to lithium-ion battery pack for electric bicycle (hereinafter
referred to as battery pack).
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 191, Packaging - Pictorial marking for handling of goods
GB/T 2828.1-2012, Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 2829-2002, Sampling procedures and tables for periodic inspection by
attributes (apply to inspection of process stability)
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 17626.2-2006, Electromagnetic compatibility - Testing and measurement
techniques - Electrostatic discharge immunity test
GB/T 36945-2018, Vocabulary of lithium-ion batteries for electric bicycle
GB/T 36943-2018, Designation and marking requirements of lithium-ion batteries
for electric bicycle
QB/T 4428, Specification and dimension of Lithium-ion batteries for electric bicycle
Carry out the cycle life test according to the method specified in 6.2.7, where the cycle
life of the battery pack shall not be less than 600 times.
5.2.8 Internal resistance
Carry out the internal resistance test according to the method specified in 6.2.8, where
the internal resistance of the battery pack shall not be greater than the manufacturer’s
specification.
5.3 Safety requirements
5.3.1 General
The safety requirements of the battery pack simulate the safety and reliability
requirements of the battery pack in the cases of overcharge, over discharge and external
short circuit when its electrical protective device fails, and simulate the safety and
reliability requirements of the battery pack under unforeseeable mechanical accidents.
5.3.2 Overcharge
When the overcharge test is carried out according to the method specified in 6.3.2, the
battery pack shall not catch fire or explode.
5.3.3 Forced discharge
When the forced discharge test is carried out according to the method specified in 6.3.3,
the battery pack shall not catch fire or explode.
5.3.4 External short circuit
When the external short-circuit test is carried out according to the method specified in
6.3.4, the battery pack shall not catch fire or explode.
5.3.5 Squeeze
When the squeeze test is carried out according to the method specified in 6.3.5, the
battery pack shall not catch fire or explode.
5.3.6 Mechanical impact
When the mechanical impact test is carried out according to the method specified in
6.3.6, the battery pack shall not catch fire, explode or leak.
5.3.7 Vibration
When the vibration test is carried out according to the method specified in 6.3.7, the
battery pack shall not leak, catch fire or explode, and the discharge capacity shall not
be lower than 95% of the initial capacity.
5.3.8 Free fall
After the free fall test is carried out according to the method specified in 6.3.8, the
battery pack shall not catch fire or explode.
5.3.9 Low air pressure
When the low pressure test is carried out according to the method specified in 6.3.9, the
battery pack shall not leak, catch fire or explode.
5.3.10 High and low temperature impact
When the high and low temperature impact test is carried out according to the method
specified in 6.3.10, the battery pack shall not leak, catch fire or explode.
5.3.11 Soaking
After the soaking test is carried out according to the method specified in 6.3.11, the
battery pack shall not leak, rupture, catch fire or explode.
5.4 Requirements for protection capability
5.4.1 General
The battery pack shall have the protection capability under abnormal working or
abnormal use conditions.
5.4.2 Overcharge protection
When the overcharge protection test is carried out according to the method specified in
6.4.2, the battery pack shall work normally without leakage, fire or explosion.
5.4.3 Over discharge protection
Carry out the over-discharge protection test according to the method specified in 6.4.3,
where the battery pack shall work normally without leakage, fire or explosion.
5.4.4 Short circuit protection
When the short-circuit protection test is carried out according to the method specified
in 6.4.4, the battery pack shall work normally without leakage, fire or explosion; after
instantaneous charging, the voltage of the battery pack shall not be less than the nominal
voltage.
5.4.5 Discharge overcurrent protection
When the discharge overcurrent protection test is carried out according to the method
specified in 6.4.5, the battery pack shall not leak, catch fire or explode; after recovery,
the battery pack shall work normally.
6.1.1 Environmental requirements
Unless otherwise specified, the test shall be carried out in the following environment:
-- temperature: 20 °C ± 5 °C;
-- relative humidity: up to 85%;
-- atmospheric pressure: 86 kPa ~ 106 kPa.
6.1.2 Requirements for measuring instruments and equipment
The accuracy of measuring instruments and equipment shall meet the following
requirements:
a) The accuracy of instruments for measuring voltage, current and temperature shall
not be less than ±0.5%;
b) The accuracy of instruments for measuring time shall not be less than ±0.1%;
c) The accuracy of weighing instruments shall not be less than ±0.5%;
d) The division value of the measuring tool for measuring external dimensions shall
not be greater than 1 mm;
e) The current of the constant flow source shall be adjustable, and the current change
shall be within ±0.5% during constant current charging or discharging;
f) The voltage of the constant flow source shall be adjustable, and the voltage
variation shall be within ±0.5% during the constant voltage charging process.
6.2 Electrical performance test
6.2.1 I2 (A) discharge
6.2.1.1 Charge
If the enterprise does not provide a charging method, the battery pack shall be charged
using the following methods.
Before charging, discharge the battery pack to the cut-off voltage at a constant current
of I2 (A). In an environment where the temperature is 23 °C ± 2 °C, charge at 0.4I2 (A).
When the terminal voltage of the battery pack reaches the limited charging voltage,
change to constant voltage charging until the charging current is less than or equal to
0.04I2 (A)...