QC/T 744-2006Nickel-metal hydride batteries for electric vehicles (English PDF)

3.1 Terms and definitions

The terms and definitions established in GB/T 2900.11 and the following ones apply to this Standard.

3.1.1 High energy density battery

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

3.1.2 High power density battery

A battery characterized by high power density and is mainly used for instantaneous high power output and input.

3.1.3 Sweep cycle

e) When the battery is subjected to the heating test in accordance with 6.2.10.5, it shall not explode or ignite.

5.1.10 Cycle life

When the battery is tested according to 6.2.11, its capacity shall not be less than 90% of the rated capacity after 500 cycles of cycle life, and liquid leakage shall not be allowed during the test.

5.1.11 Storage

When the battery is tested according to 6.2.12, the discharge capacity after recovery shall not be less than 90% of the rated capacity.

5.2 Battery module

5.2.4 20°C discharge performance Each module is required to consist of 5 or more cells in series. When the battery module is tested according to 6.3.5, its discharge capacity shall not be lower than the rated value.

Each module is required to consist of 5 or more cells in series. When the battery module is tested according to 6.3.6, the number of withstand pulses shall not

5.2.1 Appearance

5.2.2 Polarity

When the battery module is tested according to 6.3.2, the polarity of the battery shall be consistent with the polarity symbol of the sign.

When the battery module is tested according to 6.3.1, the appearance shall not be deformed or cracked, the surface shall be flat and dry, with no injury; and the arrangement shall be neat, the connection shall be reliable, and the mark shall be clear.

5.2.3 Outline dimensions and quality

The outline dimensions and quality of the battery module shall meet the technical conditions provided by the manufacturer.

5.2.5 Simple simulation conditions

6.2.9.1 Room temperature charge retention

a) The battery is charged according to the method of 6.2.4.

b) The battery is stored at 20°C ± 5°C for 28h.

c) The battery is discharged at a current of 1I3 (A) at 20°C ± 5°C until the discharge cut-off voltage (1.0V).

d) The capacity (in A·h) is calculated using the current value and the discharge time data. The charge retention can be expressed as a percentage of the rated capacity.

6.2.9.2 High temperature charge retention

a) The battery is charged according to the method of 6.2.4.

b) The battery is stored at 55°C ± 2°C for 7d.

c) After transferred to 20°C ± 5°C and persisted for 5h, the battery is discharged at a current of 1I3 (A) until the discharge cut-off voltage (1.0V).

d) The capacity (in A·h) is calculated using the current value and the discharge time data. The charge retention can be expressed as a percentage of the rated capacity.

6.2.10 Safety

All safety tests are carried out under conditions of adequate environmental protection.

6.2.10.1 Short circuit

a) The battery is charged according to the method of 6.2.4.

b) The battery is short-circuited externally. The external circuit resistance shall be less than 5mohm, and the short-circuit time is 10min. The battery shall comply with the provisions of 5.1.9 a).

6.2.10.2 Over-discharge

a) The battery is charged according to the method of 6.2.4.

b) After the battery is discharged to the cut-off voltage of 0V at a current of 1I3 (A) at 20°C ± 5°C, the discharge current is increased to 2I3 (A), and last for 10min. The battery shall comply with the provisions of 5.1.9 b).

6.2.10.3 Overcharge

capacity at 20°C ± 5°C and allowed to stand for 1h.

c) The battery is discharged at a constant current of 3I3 (A) to 1.0V at 20°C ± 5°C and allowed to stand for 1h to complete a cycle.

d) The battery is repeated 24 times according to steps b) - c).

e) CYCLE 25 times into one cycle. After the 24th cycle, the 25th cycle is charged at a constant current of 3I3 (A) to 105% of the actual capacity (i.e., 5% of the actual capacity of overcharge). If the discharge capacity of the 25th cycle of a cycle is less than 90% of the rated capacity, the cycle life test will be stopped.

Note: Actual capacity. The initial life is taken as the actual capacity at the average of the 20°C discharge capacity, and then the capacity measured by the full-capacity charge and discharge test in the previous cycle is the actual capacity.

6.2.12 Storage

a) The battery is charged according to the method of 6.2.4.

b) The battery is discharged at a current of 1I3 (A) for 2h at 20°C ± 5°C.

c) The battery is stored at 20°C ± 5°C for 90d.

d) The battery is charged according to the method of 6.2.4.

e) The battery is discharged at a current of 1I3 (A) at 20°C ± 5°C until the discharge cut-off voltage (1.0V).

f) The capacity (in A·h) is calculated using the current value in e) and the discharge time data. The capacity recovery capability can be expressed as a percentage of the rated capacity. If the capacity is lower than the value specified in 5.1.11, repeat the two steps d) and e), up to 5 times.

6.3 Battery module test

6.3.1 Appearance

CHECK the appearance of the battery module by visual inspection under good light conditions.

6.3.2 Polarity

USE a voltmeter to check the polarity of the battery module.

6.3.3 Outline dimensions and quality

USE a measuring tool and a weighing instrument to measure the outline

6.3.8 Safety

All safety tests are carried out under conditions of adequate environmental protection.

6.3.8.1 Over-discharge

a) The battery module is charged according to the method of 6.3.4.

b) The battery module is discharged at a current of 1I3 (A) at 20°C ± 5°C (if there is an electronic protection circuit, the discharge electronic protection circuit shall be temporarily removed) until the cell voltage reaches 0V. The battery module shall comply with the provisions of 5.2.7 a).

6.3.8.2 Overcharge

a) The battery module is charged according to the method of 6.3.4.

b) The battery module is charged at a current of 1I3 (A) at 20°C ± 5°C for 3h.

The battery module shall comply with the provisions of 5.2.7 b).

6.3.8.3 Short circuit

The battery module is charged according to the method of 6.3.4. The battery module is short-circuited externally for 10min. The external circuit resistance shall be less than 5mohm. The battery module shall comply with the provisions of […]

6.3.8.4 Heating

a) The battery module is charged according to the method of 6.3.4.

b) The battery module is placed in an incubator at 85°C ± 2°C and kept for 120min. The battery module shall comply with the provisions of 5.2.7 d).

6.3.8.5 Extrusion

a) The battery module is charged according to the method of 6.3.4.

b) The test is carried out according to the following conditions. The battery module shall comply with the provisions of 5.2.7 e).

The form of the extrusion plate is shown in Figure 1. One side is a flat plate and the other side is a profiled plate. The semi-cylindrical extrusion head of the profiled plate has a typical diameter of 75mm and a typical spacing between the extrusion heads of 30mm. The extrusion plate has an overall dimension of 300mm × 150mm.

a) Name of the manufacturer;

d) Marking indicated with "Keep Dry", "Keep Upright", "Handle with Care", etc.

8.2 Packaging

8.2.1 The batteries shall be packaged in accordance with the requirements for moisture and vibration resistance.

8.2.2 The accompanying files provided with the product shall be loaded in each packaging box.

a) Packing list (refer to multiple packaging);

b) Product certificate;

c) Product instruction manual.

8.3 Transportation

8.3.1 The batteries shall be transported under less than 40% of the state of charge and shall not be subjected to severe mechanical impact during transportation.

8.3.2 During the loading and unloading process, the batteries shall be handled gently to prevent falling, rolling and heavy pressure. […]

8.4 Storage