This specification describes the lithium-ion rechargeable cell's type and size, performance, technical characteristics, warning, and caution. The specification only applies to 18650-3 (2600mAh) cells.
2. Definition
2.1 Rated capacity:
Rated capacity =2600mAh, the capacity obtained when a cell is discharged at 5-hour
rate to voltage 2.75 V at 25±2.5 ℃.
2.2 Standard charge method:
At 25±2.5 ℃ , charged to 4.20V at a constant current of 0.5C, and then, charged with
a constant voltage of 4.20V until the charged current drops below 0.01C.
2.3 Standard discharge method:
At 25±2.5 ℃, discharged to 2.75 V at a constant current of 1C.
3. Cell type, bar code, appearances, and dimensions
3.1 Cell type
18650-3 2.6Ah
3.2 Cell dimensions：
4. Cell specification (fresh cell tested at 25±2.5OC, using standard charge and discharge unless otherwise specified)
|
ITEM |
SPECIFICATION |
|
Nominal capacity |
2.6Ah @ 0.2C |
|
Minimum capacity |
2.55Ah @ 0.2C |
|
Nominal voltage |
3.70V |
|
Charge ending voltage |
4.2 ±0.05 V |
|
Discharge ending voltage |
2.75 ±0.05 V |
|
Charge current |
Standard charge: 0.5C Max charge: 1C when T≥10 ℃ Max charge: 0.2C when 10 ℃ ≥T≥0 ℃ |
|
Discharge current |
Standard discharge: 1C |
|
Recommended charge and discharge cell surface temperature |
Charge: 0～ 45 ℃ |
|
Maximum allowable charge and discharge cell surface temperature. Charging and discharging at these conditions will shorten cell cycle life. |
Charge: 60 ℃ Discharge: 75 ℃ |
|
Humidity range |
0～ 90%RH (noncondensing) |
|
Internal resistance |
≤60mOhm (AC Impedance, 1000HZ) |
|
Cell dimension |
Height: 65.5 mm Max Diameter: 18.5mm Max |
|
Weight |
46±2g |
5. Technical characteristics
5.1 Electronic performance (fresh cell tested at 25±2.5OC, standard charge and discharge unless otherwise specified)
|
NO. |
ITEM |
CRITERION |
|
|
5.1.1 |
Discharge rate capability |
discharge capacity at 1C discharge capacity at 0.5C |
≥97% |
|
discharge capacity at 3C discharge capacity at 0.5C |
≥92% |
||
|
5.1.2 |
Cycle life |
discharge capacity of 500th cycle original discharge capacity |
≥80% |
|
5.1.3 |
High-Low temperature discharge performance (0.5C discharge) |
discharge capacity at -10 ℃ discharge capacity at 25OC |
≥70% |
|
discharge capacity at 0 ℃ discharge capacity at 25OC |
≥85% |
||
|
discharge capacity at 60 ℃ discharge capacity at 25OC |
≥98% |
||
|
5.1.4 |
Storage performance |
residual capacity after 28d storage original discharge capacity |
≥97% |
|
recover capacity after 28d storage original discharge capacity |
≥99% |
||
5.2 Environmental and safety characteristics
ITEM
TEST METHOD
CRITERION
5.2.1 Over discharge
Under the battery discharge to the cut-off voltage, then discharge with 0.1C, until the voltage of battery is zero.
No explosion, no fire, no leakage
5.2.2 Over charge
After the battery fully charge, overcharge with 0.5C for one hour.
No explosion, no fire, no leakage
5.2.3 reverse charge
After the battery fully charge, with 1/6C reverse current constant current charging for 8h.
No explosion, no fire, no leakage
5.2.4 130℃ high temperature
After the battery is fully charged, the battery is placed in the oven for 3OC ~ 7OC / min heating rate, the temperature rose to 130 ℃ after the start time, and (130 ± 2) ℃ temperature range of security within 1h.
No explosion, no fire, no leakage
5.2.5 High and low temperature impact
When the battery is fully charged, shelved at -40 ℃ for 1h, then shelved 1h at 85 ℃ , do such cycle for 32 times, then remove under room temperature for 6h.
No explosion, no fire, no leakage
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