Preface
Founded in 2013, Cubic New Energy is a national key specialized, special and new little giant integrating lithium and sodium-ion battery manufacturing and research and development, the company's headquarters is in Zhuzhou, Hunan, and the layout of 10GWH lithium sodium-ion battery manufacturing base in Yueyang, the company has formed a "one body and three wings", that is, consumer batteries, energy storage batteries, and sodium-ion batteries. Sodium-ion batteries currently involve 23AH pouch cells, 32700, 26700 cylindrical cells, and 75AH square aluminum shell cells.
Recently, the charging head network got a cubic new energy 26700-S01 sodium-ion cell, it is not different from the performance of ordinary lithium-ion battery charge and discharge and internal resistance, let's take a look at its performance.
Unboxing introduction
Let's still show the appearance of the product first.
Cube New Energy 26700-S01 The outer part of the cell is designed with a steel shell, and the color design of the green cell sleeve film is adopted, and the relevant specifications of the battery cell are printed on the sleeve film.
Cube New Energy 26700-S01 has a cell coding on the side of the sleeve film:
"26700-SiB S3423225000467"及"+"、"-"正负极标识。
Rated capacity: [email protected];
Nominal voltage: 3.0V, nominal energy: 10.02Wh;
AC internal resistance: 20mΩ.
The contact surface of the negative electrode of the Cubic New Energy 26700-S01 cell is made of alloy metal, and the inside is made of hard carbon anode.
The positive contact surface of the 26700-S01 cell is also made of alloy, and the internal disc is connected with four solder joints.
Cube New Energy 26700-S01 The cylindrical height of the cell is about 71.1mm.
Cube New Energy 26700-S01 cell diameter is about 26.41mm.
The weight of the 26700-S01 battery cell is about 89g.
Cube New Energy 26700-S01 is slightly larger than 18650 cells.
Charge and discharge test
After looking at the appearance, let's get to the point, and the following will be charged and discharged at 0.2C, 0.5C and 1C rates.
Charge test
The charging test will perform constant current and constant voltage charging at 0.2C, 0.5C and 1C rates, and calculate the total time consumption.
0.2C charging
Draw a line diagram, set the current to 668mA, 0.2C to charge the cubic new energy 26700-S01 sodium-ion cell, the charging cut-off voltage is 3.9V, and it takes about 5 hours and 4 minutes.
0.5C charging
Draw a line diagram, set the current to 1670mA, 0.5C to charge the Cube New Energy 26700-S01 sodium-ion cell, the charging cut-off voltage is 3.9V, and it takes about 2 hours and 13 minutes.
1C charging
Draw a line diagram, set the current to 3340mA, 1C to charge the Cube New Energy 26700-S01 sodium-ion cell, the charging cut-off voltage is 3.9V, and it takes about 1 hour and 18 minutes.
The test data is plotted as a line chart, and it takes 5 hours and 04 minutes to fully charge 0.2C, 2 hours and 13 minutes to fully charge 0.5C, and 1 hour and 18 minutes to fully charge 1C.
Discharge test
In the discharge test stage, a constant current discharge will be used to calculate the total time consumed, as well as the discharge capacity and energy values.
0.2C discharge
Draw a line diagram, set the current to 668mA, 0.2C for the cubic new energy 26700-S01 sodium ion cell discharge, the average pressure is 3.05V, put to the cut-off voltage of 1.5V, it takes about 4 hours and 55 minutes, the discharge capacity is 3291mAh, and the discharge energy is 10.04Wh.
0.5C charging
Draw a line diagram, set the current to 1670mA, 0.5C for the cubic new energy 26700-S01 sodium ion cell discharge, the average voltage is 3.02V, put to the cut-off voltage of 1.5V, it takes about 1 hour and 56 minutes, the output capacity is 3254mAh, and the energy is 9.83Wh.
1C charging
Draw a line diagram, set the current to 3340mA, 1C is the cubic new energy 26700-S01 sodium ion cell discharge, the average voltage is 2.96V, the cut-off voltage is 1.5V, it takes about 57 minutes, the discharge capacity is 3220mAh, and the energy is 9.54Wh.
Internal resistance test
In the internal resistance test part, the charging head network will use the internal resistance test instrument to test the full power internal resistance and empty power internal resistance respectively.
Summarizing the test data into the table, we can see that the internal resistance voltage of the full charge is 3.9V, the air internal resistance voltage is 1.5V, and the nominal internal resistance of the Cubic Energy 26700-S01 sodium ion cell is 20mΩ.
Drawing out the histogram, you can see that the 3.9V full-charge internal resistance is 10.71mΩ, and the 1.5V air-electric internal resistance is 12.76mΩ, both of which do not exceed the nominal internal resistance, and the performance is excellent.
Temperature test
In the temperature test part, the charging head network will measure the temperature of each charge and discharge rate after 30 minutes.
Charging temperature test
0.2C charging
Cubic New Energy 26700-S01 sodium-ion battery cells were charged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 25.8°C.
0.5C charging
The 26700-S01 sodium-ion battery cell was charged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 25.9°C.
1C charging
The 26700-S01 sodium-ion battery cell was charged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 29.3°C.
Discharge temperature test
0.2C charging
The 26700-S01 sodium-ion battery cell was discharged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 27.2°C.
0.5C charging
The 26700-S01 sodium-ion battery cell was discharged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 28°C.
1C charging
The 26700-S01 sodium-ion battery cell was discharged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 35°C.
Summary of the charging head network
This cubic new energy 26700-S01 sodium-ion cell, and 32700-S01 have the same performance and material, the charging head network is tested at 0.2C, 0.5C and 1C three rates, charging, 1C rate charging can be completed in 1 hour and 18 minutes, discharge part, you can see that 0.2C rate discharge capacity 3291mAh, close to the nominal capacity, the release energy reaches 10.04W and the nominal energy is consistent.
In terms of temperature, the charging temperature is in the range of 25-29 °C after 30 minutes of charging and discharging at three different rates, and the charging temperature is in the range of 27-35 °C.
On the whole, this cubic new energy 26700-S01 sodium-ion battery cell has good performance in both charge and discharge tests and internal resistance and temperature tests, compared with lithium batteries, sodium batteries have low cost, low temperature and the same safety as lithium batteries, cubic new energy has established Hunan sodium new energy, plans to achieve 10GWh/year production capacity of sodium-ion batteries by the end of 2025, laying a solid foundation for the sodium battery market.
Related Reading:
1. Cube 26700-S01 sodium-ion cell: a resource-rich, safe and efficient new energy option
2. Cube 32700-S01 sodium-ion cell: a safe, stable and efficient new energy option
3. Cubic cylindrical sodium-ion batteries are mass-produced and shipped!