Active Member
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[China]
Address: Topband Industry Park,Tangtou Town,Bao'an District,Sheznzhen,China
Contact name:Jerry Yang
Shenzhen Topband Battery Co., Ltd |
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High performance pouch cells 3.2V 20Ah LiFePO4 Battery
This specification describes the technique standards, test methods and precaution notes of laminate type( Lithium ion) LiFePO4 rechargeable cell, manufactured by SHENZHEN TOPBAND BATTERY CO.,LTD.
1. Specification
| No | Item | Specification | Remark |
| 1.1 | Nominal capacity | 20Ah | 25±2℃ 0.5C Discharge capacity |
| 1.2 | Min capacity | 20Ah | |
| 1.3 | Nominal voltage | 3.2V | |
| 1.4 | Charge cut-off voltage | 3.65V | |
| 1.5 | Charge current | Standard charge:0.5C (10A) | |
| Fast charge:1.0C (20A) | |||
| 1.6 | Charge time | Standard charge:3 hours (Ref.) | |
| Fast charge:1.5 hours (Ref.) | |||
| 1.7 | Max charge current | 1.5C (30A) | |
| 1.8 | Continuous discharge current | 1C (20A) | |
| 1.9 | Max discharge current | 3C (60A) | 50%SOC,≤120S |
| 1.10 | Discharge cut-off voltage | 2.4V | |
| 1.11 | Internal impedance | ≤2.5mΩ | |
| 1.12 | Weight | About 420g | |
| 1.13 | Dimension | Thickness:80mm Max | |
| Width:121mm Max | |||
| Length:212mm Max | |||
| 1.14 | Operating temperature | Charging temperature:5～45℃ Discharging temperature:-20～60℃ | |
| 1.15 | Storage temperature | -10～30℃ | |
| 1.16 | Appearance | No break,scratch,distortion,contamination,leakage. | |
2.1 Standard testing conditions
2.1.1 All performance tests is required to be conducted at temperature:25℃±5℃,Humidity: 15%~90% RH,Atmospheric pressure: 86 kPa~106 kPa.
2.1.2 Unless other special instructions, the tested product is required unused within one month after outgoing.
2.2 Standard charge mode
The “Standard charge” means at an ambient temperature of 25±5℃, the cell was discharged with 0.5C constant current to cut-off voltage 2.4V,standing 1 hour. Then charged it with 0.5C constant current to 3.65V, then change into constant charge mode, Until the charge current down to 0.05C, then stop charging and store it for 1h.| No | Item | Criteria | Testing method |
| 2.1 | 2C discharge performance | Retention capacity≥90% | Charge the cell at method 2.2 at Normal temperature; discharge it at 1C to cut-off voltage(Initial temperature )；And then charge it at method 2.2 , discharge it at 2C to the cut-off voltage again. |
| 2.2 | 0.5C Continuous discharge capacity at low temperature (-10℃) | Retention capacity ≥60% | Charge it at method 2.2, freeze the battery module for 16h at -10℃, then discharged it at required current =0.5C；until the voltage 1.8V |
| 2.3 | Discharge capacity at high temperature | Retention capacity ≥95% | Charge the cell at method 2.2；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℃. |
| 2.4 |
Cycle life at normal temperature |
1C, 100%DOD,≥2000 times | Charge the cell at 1C constant current and constant voltage at 25℃±5℃ to voltage 3.65V,current ≤0.05C, store it for 30min,then discharge it at constant current at 1.0C to the cut-off voltage 2.4V. Do the test until the capacity≤80% for 3 times. Cycle life≥2000times. |
0.5C, 100%DOD, ≥3000 times | Charge the cell at 0.5C constant current and constant voltage at 25℃±5℃ to voltage 3.65V,current ≤0.05C, store it for 30min,then discharge it at constant current at 0.5C to the cut-off voltage 2.4V. Do the test until the capacity≤80% for 3 times. Cycle life≥3000times. | ||
0.5C, 80%DOD,≥5000 times | Charge the cell at 0.5C constant current and constant voltage at 25℃±5℃ to voltage 3.55V,current ≤0.05C, store it for 30min,then discharge it at constant current at 0.5C to the cut-off voltage 3.0V. Do the test until the capacity≤80% for 3 times. Cycle life≥5000times. | ||
| 2.5 |
SOC at normal temperature | Residual capacity ≥85% of initial capacity；remain capacity≥ 90% of initial capacity | Charge the cell at method 2.2；discharge it at 1C to the cut-off voltage(Initial capacity)；Charge the cell at method 2.2；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 2.2, discharge it at 1C to the cut-off voltage (Remain voltage). |
| 2.6 |
SOC at high temperature | Residual capacity ≥85% of initial capacity；remain capacity≥ 90% of initial capacity | Charge the cell at method 2.2；discharge it at 1C to the cut-off voltage(Initial capacity)；Charge the cell at method 2.2；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 2.2, discharge it at 1C to the cut-off voltage (Remain voltage). |
All tests below are carried out on the equipment with forced ventilation and explosion-proof device. Before test, all cells are charged in accordance with 4.2, and stored 24h prior to test.
| No | Item | Criteria | Testing method |
| 3.1 | Short-circuit Test | No fire, no explosion | The cell was charged in accordance with 4.2. Then the cell is short-circuited by connecting the positive and negative terminals with a wire for 10min, the wire has a maximum resistance load of 5mΩ, then observe it for 1h. |
| 3.2 | Over charge Test | No fire, no explosion | The cell was charged in accordance with 4.2, charged at 1C constant current till the voltage reaches the 1.5 times of the specified end-off charge voltage, or the charge time reaches 1h, then stop charge, and observe for 1h. |
| 3.3 | Over discharge Test | No fire, no explosion, no leakage | The cell was charged in accordance with 4.2, discharge at 1C for 90min. Then observe it for 1h. |
| 3.4 | Crush Test | No fire, no explosion | The cell was charged in accordance with 4.2, and then is placed on the crush machine, the axis is parallel to the crush equipment, and it is crushed between two flat surfaces till the crushing force is gradually approaching 200 kN, or the voltage reaches 0V,or reaches 30% distortion, then observe it for 1h. |
| 3.5 | Impact Test | No fire, no explosion, no leakage | The cell was charged in accordance with 4.2, and stored for 30 min. The positive and negative poles of the battery are freely dropped onto the concrete floor from a height of 1.5 m; observe it for 1h. |
| 3.6 | Nail Test | No fire, no explosion |
resistance steel needle, with speed of 25±5mm/s, to go through the cell from vertical direction of pole plate, the penetrate position should be close to the geometric center of plate surface, the steel needle remains in the cell;
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| 3.7 | Heating Test (130℃) | No fire, no explosion | The cell was charged in accordance with 4.2, and Put it in a heated circulating air oven. The temperature of the oven is raised at a rate of 5℃ per minute to 130±2℃ and remain for 30 min. |
| 3.8 | Seawater immersion | No fire, no explosion | The cell was charged in accordance with 4.2； Immerse the cell in a 3.5% NaCl solution (mass fraction simulate the seawater composition at room temperature )for 2h, the water depth should pass the cell completely; observe it for 1h |
| 3.9 |
Vibration Test |
No fire, no leakage, residual capacity≥95%, Voltage change ≤0.5%, Internal impedance increase ≤20% | The cell was charged in accordance with 4.2, fastened to the vibration test bench and subjected to vibration test under the following conditions: - The vibration frequency varies at a rate of 1 Hz/min in the range
of 10-55 Hz, 90 ±5 minutes in one round trip with an amplitude of
0.8 mm (the entire maximum stroke is 1.52 mm). |
4. Dimension
| Item | Specification | Dimension |
| T | Thickness of cell | ≦8.0mm |
| W | Width of cell | ≦121mm |
| H | Height of cell | ≦212mm |
| H1 | Length of tab | 20±2.0mm |
| W1 | Width of tab | 30±0.1mm |
| W2 | Distance of tabs | 74±2.0mm |
| Tab dimension | Exposed length of tab gum | 0.2～2.0mm |
| Thickness of positive tab | 0.20±0.01mm | |
| Thickness of negative tab | 0.20±0.01mm |
4. Product picture
