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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).
Recycling of traction battery used in electric vehicle - Test of residual capacity
1 Scope
This standard specifies the terms, definitions, symbols, test requirements, test procedures and test methods of test of residual capacity for waste traction batteries used in electric vehicles.
This standard is applicable to the test of residual capacity of cells and modules of waste lithium ion traction battery and nickel metal hydride traction battery used in electric vehicles.
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 19596 Terminology of electric vehicles
GB/T 31486-2015 Electrical performance requirements and test methods for traction battery of electric vehicle
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 19596 and the following apply.
3.1
residual capacity
actual capacity remaining after the traction battery is removed from the electric vehicle
3.2
discharge capacity at I5
capacity (A·h) of the battery discharged at a current of 1I5(A) until reaching the cut-off voltage at room temperature
Note: This value may be obtained by integrating the coverage area of the current-time curve, including at least 50 equivalent time intervals, or directly measured by an integrator.
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4 Symbols
For the purposes of this document, the following symbols apply.
Cn——nominal capacity, A·h.
Wn——nominal energy, W·h.
Un——nominal voltage, V.
Ic——the first charge/discharge current of battery cell, A, with the value calculated using the equation in Table 1.
Im——the first charge/discharge current of battery module, A, with the value calculated using the equation in Table 1.
n1——quantity of battery cells connected in parallel in the module, pcs.
n2——quantity of battery cells connected in series in the module, pcs.
m——mass of battery cell, g.
5 Test requirements
5.1 Safety requirements
5.1.1 Professional personnel with battery test knowledge shall be assigned to monitor the whole process.
5.1.2 The test places shall be provided with necessary fire-fighting articles.
5.1.3 Necessary insulation measures shall be provided during the test, such as insulating gloves, insulating shoes (boots) and insulating tools.
5.2 Environmental requirements
During the test of residual capacity for traction battery, the environmental requirements shall comply with those specified in 6.1.1, GB/T 31486-2015.
5.3 Requirements for accuracy of measuring instruments and meters
During the test of residual capacity for traction battery, the accuracy of measuring instruments and meters shall comply with those specified in 6.1.2, GB/T 31486-2015.
6 Test process
6.1 The test of residual capacity for traction battery used in electric vehicles shall be carried out according to the operation process shown in Figure 1.
Keys:
Ya——the traction battery meets the appearance requirements in the technical requirements of the enterprise;
Na——the traction battery fails to meet the appearance requirements in the technical requirements of the enterprise;
Yb——the traction battery meets the voltage limit requirements in the technical requirements of the enterprise;
Nb——the traction battery fails to meet the voltage limit requirements in the technical requirements of the enterprise.
Figure 1 Operation procedures of traction battery
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6.2 Appearance inspection
6.2.1 Under good light conditions, visually inspect the appearance of traction battery module and cell. In case of any deformation, crack, liquid leakage, etc., the test of residual capacity shall not be conducted.
6.2.2 Visually inspect the appearance of traction battery cell and module. The active protection circuit, if any, shall be removed before test.
6.3 Information collection
6.3.1 Observe the labels on the exterior of traction battery and collect the basic information of traction battery, such as the nominal voltage, nominal capacity or nominal energy.
6.3.2 Weigh and record the mass of traction battery.
6.4 Voltage discrimination
Detect the terminal voltage of traction battery with a voltmeter to preliminarily determine the battery type, and discriminate the battery polarity.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Test requirements
6 Test process
7 Test method
