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Manufacturer of: |
Contact Email: xinchibatterysales@gmail.com |
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IFR21700 3.2V3000mAh cell |
ISR21700 3.6V4000mAh cell |
ISR21700 3.6V4500mAh cell |
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LMFP33140 3.6V15Ah cell |
ISR18650 3.7V2600mAh cell |
HEV 20C rate 3.6V8Ah cell |
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| ITEM | SPECIFICATION |
| Normal capacity | 4000mAh |
| Minimum capacity | 3950mAh |
| Normal voltage | 3.6 V |
| Charge voltage | 4.2 ±0.05 V |
| Discharge end voltage | 2.5 ±0.05 V |
| Standard charge current | 0.5C(7.5A) |
| Standard discharge current | 0.5C(7.5A) |
| Max charge current | 1C（T＞10℃） 0.2C（0℃-10℃） |
| Max continuous discharge current | contiuous discharge current 2C, peak discharge current 3C（T＞0℃） 1C（-10℃＜T≤0℃） 0.5C（-20℃＜T≤-10℃） |
| Surface charge and discharge batteries maximum temperature | Charge:0℃-55℃； Discharge:-20℃-60℃ |
| Working Temperature | Charge: 10°C ~ 45°C Discharge: -20°C ~ 55°C |
| Recommended Storage temperature | 15°C ~ 35°C |
| Internal resistance | ≤20 mΩ(AC Impedance, 1000 Hz) |
| Cell dimension | Height : 72.5 mm Max Diameter :21.9mm Max |
| Weight | ≤72g |
| Life cycle | >800 times |
Cell Electric performance
ITEM |
CRITERION |
TESTING METHOD |
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. |
Cycle life |
>2000cycle |
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. |
| 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. |
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. |
Cell Safety characteristics
ITEM |
CRITERION |
TESTING METHOD |
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. |
130℃ hot oven test |
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. |
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. |
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. |
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Address: At the 275-km spot to No.102 national road south,Economic-Technological Development Zone,qinhuangdao,China.
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