This specification describes the type and size, performance, technical characteristics, warning, and caution of the lithium-ion rechargeable cell. The specification only applies to 18650-3 (2500mAh) cells supplied by Shenzhen Limodish Energy Co., Ltd.
2. Definition
2.1 Rated capacity:
Rated capacity =2500mAh, 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
HW 18650-3 2.5Ah
3.2 Cell dimensions
：
4. Cell specification (fresh cell tested at 25±2.5℃, using standard charge and discharge unless otherwise specified)
|
ITEM
|
SPECIFICATION
|
|
Nominal capacity
|
2.5Ah @ 0.2C
|
|
Minimum capacity
|
2.45Ah @ 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 ℃
Max charge: 0.1C when 0 ℃≥T≥-10 ℃
|
|
Discharge current
|
Standard discharge: 1C
Max continuously discharge: 3C
Max instant (30s) discharge: 5C
|
|
Recommended charge and discharge
cell surface temperature
|
Charge: 0
～
45 ℃
Discharge: -20
～
60 ℃
|
|
Maximum allowable charge and
discharge cell surface
temperature. Charging and
discharging at these conditions will
shorten cell cycle life.
|
Charge: 60 ℃
|
|
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±2.5℃, 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 25℃
|
≥70%
|
|
discharge capacity at 0 ℃
discharge capacity at 25℃
|
≥85%
|
||
|
discharge capacity at 60 ℃
discharge capacity at 25℃
|
≥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 the battery is zero.
|
No explosion, no fire, no leakage
|
|
5.2.2 Overcharge
|
After the battery is fully charged, overcharge with 0.5C for one hour.
|
No explosion, no fire, no leakage
|
|
5.2.3 reverse charge
|
After the battery is fully charged, 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 3℃ ~ 7℃ / 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. |
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