QC/T 743-2006Lithium-ion batteries for electric vehicles (English PDF)

3.1 Terms and Definitions

For the purposes of this Standard, the terms and definitions given in GB/T 2099.11 apply.

3.1.1 High energy density battery

The battery characterized by high energy density and mainly used for high energy output.

3.1.2 High power density battery

The battery characterized by high power density and mainly used for input and output of high power.

3.1.3 Charge recovery

The ratio between the discharge capacity AND the rated capacity of battery that has been stored for certain time and recharged under certain temperature.

3.1.4 End-of-charge current

The current when the battery is charged at designated constant voltage and at the end of charge.

3.1.5 Explosion

The shell of battery cracks with solid material rushing out from the battery and making a sound.

3.1.6 Fire

The fire started in the shell of battery.

5.1 Cell-battery

5.1.1 Appearance

When the battery is inspected according to Clause 6.2.1, there shall be no deformation or crack on the appearance. The surface shall be smooth, dry, without external damage or pollutant etc. and the mark shall be clear and correct.

5.1.2 Polarity

When the battery is inspected according to Clause 6.2.2, the polarity of terminal shall be right. There shall be clear identifications of the positive-negative polarity.

5.1.3 Dimension and mass

The dimension and mass of the battery shall conform to the technical specifications provided by the manufacturer.

5.1.4 Discharge capacity at 20°C

When the battery is inspected according to Clause 6.2.5, its capacity shall be no less than the rated value that is specified in the technical specifications and provided by the manufacturer. At the same time, the capacity shall be no more than 110% of the rated value that is specified in the technical specifications and provided by the manufacturer.

5.1.5 Discharge capacity at -20°C

When the battery is inspected according to Clause 6.2.6, its capacity shall be no less than 70% of the rated value.

5.1.10 Cycle life

When the battery is tested according to Clause 6.2.11, its cycle life shall be no less than 500 times.

5.1.11 Safety

5.2 Battery module

5.2.1 Appearance

When the battery module is inspected according to Clause 6.3.1, there shall be no deformation or crack on the appearance. The surface shall be smooth, dry, without external damage; and it shall be arranged neatly, connected reliably and marked clearly etc.

5.2.2 Polarity

When it is inspected according to Clause 6.3.2, the polarity of terminals shall be correct, with clear identifications of the positive and negative electrodes.

5.2.3 Dimension and mass

It shall be according to the technical specifications provided by the manufacturer.

5.2.4 Discharge capacity at 20°C

Each module is required to be composed of at least 5 or more cell-batteries in series.

When the battery module is inspected according to Clause 6.3.4, its capacity shall be no less than the rated value specified in the technical specifications that the manufacturer provided. At the same time, the capacity shall be no more than 110% of the rated value specified in the technical specifications that the manufacturer provided.

5.2.6 Vibration resistance

Each module is required to be composed of at least 5 or more cell-batteries in series.

When the battery module is tested according to Clause 6.3.7, there shall be no sudden-change of discharge current, abnormal voltage, deformation of battery shell, electrolyte leakage or other phenomena. And it shall maintain reliable connection and good structure, without loosened installation of machines.

5.2.7 Safety

Each module is required to be composed of at least 5 or more cell-batteries in series.

6.1 Test condition

6.1.1 Environmental condition

Unless otherwise stated, test shall be performed at 15°C ~ 35°C, relative humidity is 25% ~ 85%, air pressure is 86kPa ~ 106kPa.

6.1.2 Accuracy of measuring instruments and meters

6.2 Cell-battery test

6.2.1 Appearance

Visually inspect the appearance of the battery under good light condition.

6.2.2 Polarity

Measure the polarity of the battery with voltage meter.

6.2.3 Dimension and mass

Measure the dimension and mass of the battery with measuring and weighting instruments.

6.2.4 Charge of battery

Charge the battery according to the special provisions provided by the manufacturer. If the manufacturer does not provide the charger, then discharge the battery, under 20°C ± 5°C, at 1I3 (A) current; stop the discharge when the voltage of the battery reaches 3.0V (or the end-of-discharge voltage specified in the technical specifications of the manufacturer).

Stand for 1h; then charge it at 1I3 (A) constant-current under 20°C ± 5°C; change to constant-voltage charging when the voltage of the battery reaches 4.2V (or the end-of-discharge voltage specified in the technical specifications of the manufacturer); stop the discharging when charging current reduces to 0.1I3.After charging, stand for 1h.

6.2.5 Discharge capacity at 20°C

6.2.6 Discharge capacity at - 20°C

6.2.7 Discharge capacity at 55°C

6.2.8 Discharge capacity at 20°C magnification

6.2.10 Storage

6.2.11 Cycle life

6.2.12 Safety

All the safety tests shall be carried out under conditions with sufficient environmental protection.

6.3 Battery module test

6.3.1 Appearance

Visually inspect the appearance of the battery in good light condition.

6.3.2 Polarity

Measure the polarity of the battery with voltage meter.

6.3.3 Dimension and mass

Measure the dimension and mass of the battery module with measuring and weighting instruments.

6.3.8 Safety

All the safety tests shall be carried out under conditions with sufficient environmental protection.

6.3.8.1 Over-discharge

6.4 Test procedure

6.4.1 Testing according to this procedure shall be performed continuously.

6.4.3 Test procedure of battery modules refers to Table 2

6.4.2 Test procedure of cell-batteries refers to Table 1

7.2 Exit-factory inspection

7.2.1 Sample the products randomly from each batch of products before leaving the factory; for inspection item of discharge capacity at 20°C, the difference of discharge capacity of all battery samples at 1I3 (A) shall not be lower than ±5%.

7.2.2 In the exit-factory test, if one or more items are unqualified, it shall return this batch of products to the Production Department for repair and inspection, then resubmit them for inspection. If there are still one or more items unqualified, then this batch of products shall be judged as unqualified.

7.3 Type inspection

7.3.1 Carry out the type inspection under one of the following conditions. […]

7.3.2 Judgment rules

In the type inspection, if there is one item unqualified, the product shall be judged as unqualified.

8.1 Marking

8.1.1 Following markings shall be attached on battery products.

8.1.2 External surface of packing case shall have following markings.

8.2 Packaging

8.2.1 Packaging of battery shall meet the requirements of moisture-proof and anti-vibration.

8.3 Transportation

8.3.1 The transport-charge state of battery shall be less than 40%. In the transportation, the products shall be prevented from intensive mechanical crack, sun and rain; it shall not be inversed.

8.4 Storage

8.4.1 The battery shall be stored in at 5°C ~ 40°C, dry, clean and good ventilated warehouse.

8.4.2 The battery shall be prevented from direct sunshine; it shall be placed no less than 2m to heating source. […]