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GB/T 31486-2015 (GB/T31486-2015)

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GB/T 31486-2015: PDF in English (GBT 31486-2015)

GB/T 31486-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.120
T 47
Electrical performance requirements and test
methods for traction battery of electric vehicle
ISSUED ON. MAY 15, 2015
IMPLEMENTED ON. MAY 15, 2015
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
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 ... 4 
4 Symbols ... 6 
5 Requirements ... 6 
6 Test methods ... 8 
7 Inspection rules ... 16 
Foreword
This Standard is drafted based on the rules given in GB/T 1.1-2009.
This Standard was proposed by Ministry of Industry and Information Technology of the
People’s Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee of Auto
Standardization (SAC/TC 114).
Drafting organizations of this Standard. China Automotive Technology & Research
Center, No.18 Research Institute of China Electronics Technology Group Corporation,
China North Vehicle Research Institute, Shenzhen BYD Auto Co., Ltd., Shanghai
Motor Vehicle Inspection Center, Technology Center of Shanghai Automotive Group
Co., Ltd., Beiqi Foton Motor Co., Ltd., Chongqing Changan New Energy Automobile
Co., Ltd., Putian New Energy Co., Ltd., Harbin Coslight Rower Co., Ltd.,
Contemporary Amperex Technology Ltd. Headquarters (NingDe), Huizhou Epower
Electronic Co., Ltd., Citic Guoan MGL Power Source Technology Co., Ltd., Heter
Electronics Group Co., Ltd., Shanghai CENAT Energy Company Limited, Zhejiang
Godsend Power Technology Co., Ltd., Jiangsu Chunlan Clean Energy Research
Institute Co., Ltd., Beijing Institute of Technology, Beijing Jiaotong University,
HuaChen Group Auto Holding Co., Ltd., Fujian Nebula Electronics Co., Ltd., Hunan
Copower EV Battery Co., Ltd. AND Pan Asia Technical Automotive Center Co., Ltd.
Main drafters of this Standard. Wang Fang, Meng Xiangfeng, Xiao Chengwei, Fan Bin,
Hu Daozhong, Jiang Wenfeng, Xu Jinmei, Wang Zhenpo, Jiang Jiuchun, Shao Zhehai,
Wang Zhanguo, Ruan Xusong, Miao Wenquan, Ma Lishuang, Wen Feng, Yang Tao,
Yang Congjiao, Sun Jianping, Zhao Shuhong, Yuan Changrong, Wu Ningning, Liu
Zhengyao, Liu Zhen, Liu Lei, Shan Chong, Wang Yong, Qiu Jie, Xu Guochang, He
Xiangyun and Wang Xin.
Electrical Performance Requirements and Test
Methods for Traction Battery of Electric Vehicle
1 Scope
This Standard specifies the electrical performance requirements, test methods, and
inspection rules for traction battery of electric vehicle (hereinafter referred as “traction
battery”).
This Standard is applicable to lithium-ion battery and metal hydride nickel battery
which are used in electric vehicle. For other traction batteries, this Standard is served
as reference.
2 Normative references
The following documents are indispensable for the application of this document. For
the dated reference documents, only dated versions apply to this document. For the
undated reference documents, the latest versions (including all amendments) apply to
this document.
GB/T 2900.41 Electrotechnical terminology - Primary and secondary cells and
batteries
GB/T 19596 Terminology of electric vehicles
3 Terms and definitions
The following terms and definitions and those specified in GB/T 2900.41 and GB/T
19596 apply to this Standard.
3.1
secondary cell
A basic unit device composed of electrode, membrane, electrolyte, case, and terminal
which can directly transform chemical energy into power energy and be charged.
3.2
battery module
A power supply combination of one or more secondary cell(s) which are connected in
series or in parallel or both series and parallel with only one pair of positive and
negative output terminals.
3.3
rated capacity
The capacity (Ah) released FROM the time when fully charged traction battery is
discharged at the current of 1I1 (A) TO the time when it reaches to the final voltage
under room temperature.
3.4
rated energy
The energy (Wh) released FROM the time when fully charged traction battery is
discharged at the current of 1I1 (A) TO the time when it reaches to the final voltage
under room temperature.
3.5
initial capacity
The capacity (Ah) released FROM the time when fully charged power traction battery,
which is fresh from the factory, is discharged at the current of 1I1 (A) under room
temperature TO the time when it reaches to the terminal discharging condition as
specified by factory.
3.6
high energy traction battery
The traction battery with the ratio of the maximum allowable continuous output electric
power (W) to 1C rate-discharge energy (Wh) lower than 10 under room temperature.
3.7
high power traction battery
The traction battery with the ratio of the maximum allowable continuous output electric
power (W) to 1C rate-discharge energy (Wh) no lower than 10 under room
temperature.
3.8
capacity recovery
The ratio of the discharge capacity of the fully charged traction battery which is fully
recharged after being put under certain temperature for a while to initial capacity.
- Time measuring device. ± 0.1%;
- Dimension measuring device. ± 0.1%;
- Mass measuring device. ± 0.1%.
6.2 Secondary cell test
6.2.1 Appearance
Under good light condition, visually check the appearance of secondary cell.
6.2.2 Polarity
USE voltmeter to detect the polarity of secondary cell.
6.2.3 External dimension and mass
USE measuring apparatus and weighing apparatus to measure the external
dimension and mass of secondary cell.
6.2.4 Secondary cell charging
Under room temperature, the secondary cell is discharged at the current of 1I1 (A)
until it reaches to the final voltage specified in the technical conditions of manufacturer;
PUT it aside for 1 h (or less than 1 h as specified by the manufacturer); CHARGE it
according to the charging method provided by the manufacturer.
If the manufacturer does not provide charging method, the following method can be
adopted.
a) As to the lithium ion battery, charge it at the constant current of 1I1 (A) and then
change to constant-voltage charge when it reaches to the final voltage specified
in the technical conditions of manufacturer. When the charging current falls to
0.05I1 (A), stop charging. After charging, put it aside for 1 h (or less than 1 h as
specified by the manufacturer);
b) As to the metal hydride nickel battery, charge it at the constant current of 1I1 (A)
for 1 h and then charge it at the constant current of 0.2I1 (A) for 1 h. After
charging, put it aside for 1 h (or less than 1 h as specified by the manufacturer).
6.2.5 Discharge capacity under room temperature (initial capacity)
TEST discharge capacity under room temperature according to the following
procedures.
a) CHARGE the secondary cell according to the method in 6.2.4;
b) Under room temperature, the secondary cell is discharged at the current of 1I1
(A) until it reaches to the final voltage specified in the technical conditions of
manufacturer;
c) MEASURE the discharge capacity (in Ah); CALCULATE the discharge specific
energy (in Wh/kg);
d) REPEAT a) ~ c) for 5 times. When the range of 3 continuous test results is lower
than 3% of the rated capacity, the test can be ended. TAKE the last 3 test results
to calculate the average.
6.3 Battery module test
The battery module sample used for test shall conform to the following conditions.
- Total voltage not lower than 5 times of voltage of secondary cell;
- Rated capacity not lower than 20 Ah or consistent with the rated capacity of battery
system for whole vehicle.
Note. the traction battery module used for test can be combined by actual modules in series or
parallel.
6.3.1 Appearance
Under good light condition, visually check the appearance of battery module.
6.3.2 Polarity
USE voltmeter to detect the polarity of battery module.
6.3.3 External dimension and mass
USE measuring apparatus and weighing apparatus to measure the external
dimension and mass of battery module.
6.3.4 Battery module charging
Under room temperature, the battery module is discharged at the current of 1I1 (A)
until the voltage of any one of secondary cells reaches to the final discharge voltage.
PUT it aside for 1 h (or less than 1 h as specified by the manufacturer); CHARGE it
according to the charging method provided by the manufacturer.
If the manufacturer does not provide charging method, the following method can be
adopted.
a) As to the lithium ion traction battery, charge it at the constant current of 1I1 (A)
and then change to constant-voltage charge when it reaches to the final charge
voltage specified in the technical conditions of manufacturer. When the charging
current falls to 0.05I1 (A), stop charging. If one of secondary cells exceeds the
GB/T 31486-...
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(Above excerpt was released on 2015-09-15, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT31486-2015