LiFePO4 6.4V 18Ah 21700 cylindrical lithium ion battery for UPS,EV/PHEV/Solar System,Storage system,Backup power supply.
Product Information:
| Type: | LiFePO4( Lithium Iron Phosphate) | Max Charge: | 1C |
| Max Discharge: | 2C | Max Pulse Discharge Current: | 1C |
| Internal Impedance: | ≤30mΩ | Capacity: | 18Ah |
| Cycle Life: | ≥2000cycles @ 100% DOD | Warranty: | 1 Year |
| Nominal Capacity: | 18Ah/customized | Nominal Voltage: | 6.4V |
| Weight: | 660± 5 g | Size: | Height:81mm*Length:108*Thickness:68mm |
| Application: | UPS,EV/PHEV/Solar System,Storage,Starting Power Supply |
Production Description:
1. General
This product specification describes the technique requirements, test procedures and precaution notes of Cylindrical Lithium-ion phosphate rechargeable cell, manufactured by Shenzhen AMT Technology Co., Ltd.
2. Cell’s Characteristic:
Sturdy and pressure resistant steel envelopeHigh capacityExcellent cycle lifeExcellent high and low temperature performanceSteady output voltageLow self-dischargeDouble safety protectionWith outstanding high level of vibrations and shocks
3. Electrochemical Performance
| Test Item | Test Method | Criteria |
| AC Impedance | Cell shall be measured at 1000 Hz after charged per standard charging. | ≤ 30 mΩ |
| Initial Capacity | Cell shall be charged standard per charging. and discharged per standard discharging within 1h after full charge. | Cini ≥18Ah |
| Cycle Life | Cell shall be charged at CC/CV mode(CC: 1 C, CV: 3.65 V, End-of-charge current: 0.05 C); After stored for 30 min, cell shall be discharged at CC mode(1 C, End-of-charge voltage: 2.0 V); After stored for 30 min, tests shall be continued for 2000 times. | Capacity retention ≥ 80 % |
| High-rated Discharging Performance | Cell shall be charged per standard charging, and discharged at 6C to ending voltage at RT. | Discharge Capacity: ≥ 90%Cini |
| Low Temperature Performance | Cell shall be charged per standard charging and stored in atemperature-controlled environment for 4h.Then discharged cell at 1C to ending voltage. | Discharge Capacity: ≥ 70%Cini(-20°C) |
| Room Temperature Storage Test | Cell shall be charged per standard charging, then stored at 25 °C ±2 °C for 28 days. Finally discharged cell at 1 C to ending voltage. | Capacity retention ≥90% |
| High Temperature Storage Test | Cell shall be charged per standard charging, then stored at 55 °C ±2 °C for 7 days. After standing for 5h,discharged cell per standard discharging. | Capacity retention ≥ 90 % |
| Remark: 1.“Standard Charging” means that in standard test conditions, charge the cell at a constant current of 1 C until the voltage reaches 3.65 V, then charge it at a constant voltage of 3.65 V until the current decreases less than 0.05 C and placed for 1 h. 2.“Standard Discharging” means that in standard test conditions, discharge the cell at a constant current of 1 C until the voltage reaches 2.0 V. | ||
4. Reliability Test
| Constant Temperature and Humidity Test | Cell shall be charged per standard charging, and stored in 45 °C ±2 °C (90~95% RH) for 48 h. Then be placed in RT for 2h and checked for 1h. | No distortion, no rust, no fume and no explosion. |
| Thermal Shock Test | Cell shall be charged per standard charging and put into an oven.Temperature inside the oven will drop to -40 °C in 60min and remain for 90 min. Then it will rise to 25 °C in 60 min and keep rising to 85 °C in 90 min, following by remaining for 110 min. And it will drop to 25 °C in 70 min.Repeat this process for 5 times, then check it for 1h. | No explosion, no fire, no leakage. |
| Low-pressure Test | Cell shall be charged per standard charging, then stored it for 6h at an absolute pressure of 11.6 kPa (RT). Check it for 1h. | No explosion, no fire, no leakage. |
| Drop Test | Cell shall be charged per 3.2, then dropped from a height of 1.5 m onto the concrete ground. Positive and negative terminals of cells shall be towards the ground. Check it for 1h. | No explosion, no fire. |
| Soaking Test | Cell shall be charged per standard charging, then completely soaking into NaCl solution (3.5 wt %) for 2h. Check it for 1h. | No explosion, no fire. |
5. Safety Test
| External Short-Circuiting Tes | Cell shall be charged per standard charging, then short-circuited by connecting the positive and negative terminals with a resistance of <5 mΩ for 10 min. Check it for 1h. | No explosion, no fire. |
| Over-charge Test | Cell shall be charged per standard charging, then charged at 1C to ending voltage of 5.5 V or charged at 1C for 1h. Check it for 1h. | No explosion, no fire. |
| Over-discharge Test | Cell shall be charged per standard charging, then discharged at 1C for 90min. Check it for 1h. | No explosion, no fire, no leakage. |
| Crush Test | Cell shall be charged per standard charging,then crush the cell perpendicularly to the cell plate at a rate of (5±1) mm/s with a semi-cylinder (radius of 75 mm). When met any of the following criteria, stopping crushing and check it for 1h. 1. Voltage reaches 0V; 2. Deformation reaches 30%; 3. Pressure reaches 200 kN. | No explosion, no fire. |
| Acupuncture Test | Cell shall be charged per standard charging,then acupuncture the cell perpendicularly to the cell plate at a rate of (25±5)mm/s with a ϕ5 mm~ϕ8 mm steel needle and remain it inside.The acupuncturing location shall be near the geometric center of plane. Check it for 1h. | No explosion, no fire |
| Heating Test | Cell shall be charged per standard charging, then heated in an oven.Temperature will rise to 130 °C±2 °C at a rate of 5 °C/min and remain for 30 min. Check it for 1h. | No explosion, no fire. |
