ITEM

CRITERION

TESTING METHOD

1

Discharge rate performance

A）Discharge Performance (0.2C) ≥100％Rated Capacity
B）Discharge Performance (0.5C) ≥95％Rated Capacity
C）Discharge Performance (1C) ≥90％Rated Capacity
D）Discharge Performance (2C) ≥80％Rated Capacity

The cell is charged according to standard charge method, and then, it is discharged to 2.75V using 0.2C current; after, the cell is charged according to standard charge method, and then, it is discharged to 2.75V using 0.5C current; The cell is charged according to standard charge method, and then, it is discharged to 2.75V using 1.0C current; At the end, the cell is charged according to standard charge method, and then, it is discharged to 2.75V using 2.0C current;
The discharge capacities under different current shall be recorded.。

2

Cycle life

≥500cycle

Under room temprature, the cell is charged to 4.2V using 0.5C current and then store it for 10 min. Then it is discharged to 2.75V using 1C current. Recycle it continuously till the residual capacity is less than 80% of the rated capacity.

3

High-Low temperature discharge performance

Discharge capacity/ initial capactiy×100％
A)60℃≥95% rated capacity
B)0℃≥80％rated capacity
C)-10℃≥70% rated capacity
D)-20℃≥55% rated capacity
No obvious outside damage, No leakage, No smoke, No explosion

Test the batteries’ initial state and capacity , after standard charging, store it at 60±2℃ for 3 hours, discharge at 0.2C5mA to 2.5V, then make standard charging under room temperature. Then Store it at corresponding constant temperature for 3h under 0±2 ℃/-10±2 ℃/-20±2 ℃ in order. Then discharge the cell at 0.2C5mA to 2.5V and meanwhile make a capacity record. At last store it at room temperature for 2 hours and observe the cell appearance.

4

Storage performance

Residual Capacity≥90％Rated Capacity
Recovery Capacity≥98% Rated Capacity
Internal resistance increase rate≤30％

After standard fully charge, make standard discharge. This capacity is recorded as initial discharge current. Then the cell is fully charged according to standard charge method and stored at 25℃ for 28 days. After storage, the cell is discharged according to the requirement of standard discharge method. This discharge capacity is named as the Residual capacity. And then charge and discharge the cell by 0.5C. This discharge capacity is recorded as the Recovery capacity.

ITEM

CRITERION

TESTING METHOD

1

Vibration

No leakage、No flame、No fire、No explosion

After standard charging, fixed the cell to vibration table and subjected to vibration cycling that the frequency is to be varied at the rate of 1Hz per minute between 10Hz and 55Hz,the excursion of the vibration is 1.52mm. The cell shall be vibrated for 90 minutes per axis of x, y axes.                                                 

2

Mechanical shock

No leakage、No flame、No fire、No explosion

In direction X, Y, and Z intersecting one another at right-angles, apply impacts having a minimum mean acceleration of 75G in the first 3mSec and a peak acceleration that falls between 125G and 175G..

3

Temperature Cycling Test

no leakage, no  fire, no explosion

The fully charged batteries are to be placed in a test chamber and subjected to the following cycles:
a) Raising the temperature to 75°C ±2°C within 30 minutes and maintaining this temperature for 4 hours.                                                        

 b) Reducing the  temperature to 20°C ±2°C within 30 minutes and maintaining this temperature for 2 hours.
c) Reducing the  temperature to minus 20°C ±2°C (minus 40 ±5°F) within 30 minutes and maintaining this temperature for 4 hours.
d) Raising the temperature to 20°C±2°C within 30 minutes.                                                    e) Repeating the sequence for a further 4cycles. f) After the 5th cycle, storing the batteries for 7 days prior to examination.

ITEM

CRITERION

TESTING METHOD

5.5.1

Overcharge test

No flame、No fire、No explode

The cell is discharged following the standard discharge method. Apply a 10V power supply and a 3C charge current for 1.5hrs.

5.5.2

130℃ hot oven test
130℃

When the temperature of the cell is 130℃.
Cell must not fire or explode in 30 minutes

The cell is charged following the standard charge method. After charging the cell is put in the oven. And then the oven temperature will be ramped at 5℃ per minute to 130℃ and held at 130℃.  When the temperature of the cell reach 130℃, the cell is maintained in the 130℃ oven for a maximum of 30 minutes or until a fire or explosion is obtained.

5.5.3

Over discharge test

No flame、No fire、No explode

Cell shall first be charged according to standard charge method，and then cell is to be discharged by 0.2C current for 12 hours; The test is completed when the cell is to be discharged up to 250% of rate capacity or the other protective devices prevent the discharge.

5.5.4

Crush test

No fire、No explode

After charging a cell following the standard charge method, the cell shall be crushed between two flat surfaces. The direction of the crushing force shall be vertical to axis of the cylinder. The crushing force is to be applied by a hydraulic ram with a 32mm diameter piston. Crushing force is approximately 13 KN. Once the maximum pressure has been obtained it is to be released.

5.5.5

Short circuit test

No fire、No explode

The battery to be fully charged with standard charging condition, and short the positive and negative terminals with wire resistance=100mΩ.Tests are to be conducted at 23℃ ±3℃ and at 55℃ ±5℃.

5.5.6

Impact test

No flame、No fire、No explode

Cell shall first be charged according to standard charge method，then the battery cell was placed on a flat surface so that the longitudinal axis of the battery cell shall be parallel with it.
A 7.9mm diameter bar is to be placed across the center of the sample. A.9.1kg weight is to be dropped from a height of 61cm on the sample.