This specification describes the technique standards, test methods and precaution notes of rechargeable pouch LiFePO4 cell, manufactured by SHENZHEN TOPBAND BATTERY CO.,LTD.
No | Item | Specification | Remark |
3.1 | Nominal capacity | 5000mAh | 25±2℃ 0.5C Discharge capacity |
3.2 | Min capacity | 4800mAh | |
3.3 | Nominal voltage | 3.2V | |
3.4 | Charge cut-off voltage | 3.65V | |
3.5 | Charge current | Standard charge:0.5C (2.5A) | |
Fast charge:1.0C (5.0A) | |||
3.6 | Charge time | Standard charge:3 hours (Ref.) | |
Fast charge:2 hours (Ref.) | |||
3.7 | Max charge current | 5C (25A) | |
3.8 | Continuous discharge current | 35C (175A) | |
3.9 | Max discharge current | 70C (350A) | ≤10S |
3.10 | Discharge cut-off voltage | 2.0V | |
3.11 | Internal impedance | ≤3.0mΩ | |
3.12 | Weight | About 150g | |
3.13 | Dimension | Thickness:10.6mm Max | |
Width:57.5mm Max | |||
Length:132.0mm Max | |||
3.14 | Operating temperature | Charging temperature:5~45℃ Discharging temperature:-20~60℃ | |
3.15 | Storage temperature | -10~30℃ | |
3.16 | Appearance | No break,scratch,distortion,contamination,leakage. |
No | Item | Criteria | Testing method |
5.1 | 1C discharge performance | Retention capacity≥95% | Charge the cell at method 4.2 at Normal temperature; discharge it at 1C to cut-off voltage(Initial temperature );And then charge it at method 4.2 , discharge it at 1C to the cut-off voltage again. |
5.2 | 30C continuous discharge capacity at normal temperature | Retention capacity ≥85%,Surface temperature ≤70℃ | Rested the cell at least 1h after it is full charged at 25℃±5℃,then discharge it at 30C to the cut-off voltage 2.0V. |
5.3 | Large current performance at normal temperature | Load voltage within 10S≥2.05V | Rest the cell at least 1h after it is full charged at 25℃±5℃,then test it according to the requirements:Discharge current =60C 10S,Load voltage within 10S ≥2.05V |
5.4 | 20C Continuous discharge current performance at low temperature (0℃) | Voltage at 5S≥2.5v Voltage at 90S≥1.8V | Freeze the battery module for 10h at 0℃ until it is full charged, then discharged it at required current =20C;until the voltage 1.8V, voltage at 5S ≥2.5V, voltage at 90S≥1.8V |
5.5 | 20C Continuous discharge current performance at low temperature (-18℃) | Voltage at 10S≥1.8V | Freeze the battery module for 20h at -18℃ until it is full charged, then discharged it at required current =20C;until the voltage 1.8V, voltage at 10S ≥1.8V |
5.6 | Discharge capacity at high temperature | Retention capacity ≥95% | Charge the cell at method 4.2;Discharge at 1C to the cut-off voltage;Charge the cell at method 4.2;store the cell at 55℃±2℃ for 5h,then discharge at 1C to the cut-off voltage at 55℃±2℃. |
5.7 |
Cycle life at normal temperature |
≥2000 times | Charge the cell at 0.5C constant current and constant voltage at 25℃±5℃ to voltage 3.65V,current ≤0.03C, store it for 30min,then discharge it at constant current at 1.0C to the cut-off voltage 2.0V. Do the test until the capacity≤80% for 3 times. Cycle life≥2000times. |
5.8 |
SOC at normal temperature | Residual capacity ≥95% of initial capacity;remain capacity≥ 98% of initial capacity | Charge the cell at method 4.2;discharge it at 1C to the cut-off voltage(Initial capacity);Charge the cell at method 4.2;store it at 25℃±2℃ for 28 days;then discharge it at 1C to the cut-off voltage(Residual capacity); Charge the cell at method 4.2, discharge it at 1C to the cut-off voltage (Remain voltage). |
5.9 |
SOC at high temperature | Residual capacity ≥90% of initial capacity;remain capacity≥ 95% of initial capacity | Charge the cell at method 4.2;discharge it at 1C to the cut-off voltage(Initial capacity);Charge the cell at method 4.2;store it at 55℃±2℃ for 7 days;then discharge it at 1C to the cut-off voltage(Residual capacity); Charge the cell at method 4.2, discharge it at 1C to the cut-off voltage (Remain voltage). |
The Cell shall be shipped by insulated packaging and in voltage range of 3.20~3.40 V, and 50% SOC, or in accordance with customers’ requirement. The remaining capacity before charging shall depends on the storage time and conditions. To ensure the cells in a good transport environment is necessary.