Jiangsu Zhitai New Energy Technology Co., Ltd
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Sodium-ion battery Cell 3V 70Ah prismatic type
Suitable for extreaml cold area
3.1 Nominal Capacity: 70Ah
3.2 Nominal Voltage: 3V
3.3 AC Impedance : ≤0.28mΩ 30%SOC
3.4 Max. Constant Charge Current: 70A
3.6 Charge Voltage Limit: 3.9V
3.7 Max. Constant Discharge Current: 70A 1.0C
3.8 Max. Plus Discharge Current: 210A 3C
3.9 Cut-off Voltage: 1.9V
3.10 Charge Operation Temperature: -20~55℃
3.11 Discharge Operation Temperature:-30~55℃
3.12 Cell Weight:5KG±0.25KG
3.13 Self discharge : ≤3%/month 25±2℃,30%SOC,
Count after 3 month of 30%SOC fresh cell
Cell Performance Criteria
Visual inspection
There shall be no such appearance defect as stains, crack, leakage, etc.
Standard environmental test condition
Unless otherwise specified, all tests stated in this Product Specification are conducted at below conditions:
Temperature: 25 ± 2 °C
Relative Humidity: 65 ± 20%
Standard charge
Under the standard test condition,charging the cell with constant current at 0.5C to 4.0V and then with constant voltage at 4.0V till charge current declines to 0.05C.
Electrical characteristics
| Items | Test Method and Condition | Criteria |
| Minimum capacity at 0.2C |
Charge the cell under standard test condition and discharge the cell to 2.0V with 0.2C current, then get the capacity |
≥70Ah |
| Initial impedance | Internal resistance measured at 1KHz at 30%SOC. | ≤0.28mΩ |
| Cell Voltage | As of shipment | 2.950~3.050V |
| Cycle Life (25±2℃) | Test condition: Charge:0.5 C to 4.0V,CV to 0.05C Discharge:1.0C to 2.0V When capacity declines to 80% of the first cycle capacity,stop the test. |
≥4000 |
| H/L temperature discharge |
Full charge the cell by standard charge condition, displace in -20±2℃ chamber for 8h, then discharge the cell at 0.5C to 1.5V Full charge the cell by standard charge condition, displace in 55±2℃ chamber for 5h, then discharge the cell at 0.5C to 2.0V. |
Capacity remain ≥85% Initial capacity Capacity remain ≥95% Initial capacity |
| RT storage performance | The capacity on 0.5C discharge (residual capacity) shall be measured after standard charge and then storage at 25±2℃ for 30 days After above test,cycle the cell with 0.5C/0.5C for 3 times, select the max capacity as the recovery capacity. |
Residual capacity ≥ 95% Recovery capacity ≥98% |
| HT storage performance |
The capacity on 0.5C discharge (residual capacity) shall be measured after standard charge and then storage at 55±2℃ for 7 days. After above test,cycle the cell with 0.5C/0.5C for 3 times, select the max capacity as the recovery capacity |
Residual capacity ≥
|
Safety and Reliability
| Items | Test Method and Condition | Criteria |
| Overdischarge | Full charge the cell by standard charging method, discharge the cell 90min using 1.0C, then observe for 1h under test environment temperature. |
No fire, No explosion. |
| Overcharge | Full charge the cell by standard charging method, charge the cell to 4.4V using 0.5C, then observe for 1h under test environment temperature |
No fire, No explosion. |
| External short | Full charge the cell by standard charging method, connect the positive and negative tabs with a load less than 5mΩ for 10min, then observe for 1h under test environment temperature |
No fire, No explosion. |
| Heating | Full charge the cell by standard charging method, displace the cell into temperature chamber, use following temperature rising method heating cell: rising to 130±2 ℃ at a rate of 5℃/min from room temperature, stay at 130℃ for 30min, stop heating, then observe for 1h under test environment temperature. |
No fire, No explosion. |
| Temperature cycle | Full charge the cell by standard charging method, displace the cell into temperature chamber, use following method adjust chamber temperature, cycle for 5 times, then observe for 1h under test environment temperature. |
No fire, No explosion. |
| Crush | Full charge the cell by standard charging method, use a half cylinder with Φ75mm to squeezing the cell(perpendicular direction) and the move speed is less than 2mm/s. When the cell voltage declines to 0V or the deformation reaches 15% or the extrusion force reaches 2.67KN, stop then hold for 10min, observe for 1h under test environment temperature |
No fire, No explosion. |