Preface
Previously, the charging head network introduced the 26700-S01 model battery under Cube Battery, which can provide customers with products and green solutions with high safety, long life, high rate, high specific energy and high reliability, and can provide customers with customized products and solutions. In addition to the 3340mAh cell, there is also a Cube New Energy 32700-S01 cell, which still strictly follows international quality standards and environmental protection standards.
Unboxing introduction
Let's still show the appearance of the product first.
Cube New Energy 32700-S01 cell is designed with a steel shell on the outside, and the color of the blue cell sleeve is designed, and the relevant specifications of the battery cell are printed on the sleeve film.
Cubic New Energy 32700-S01 has the "32700-SiB S332315615196" and "+" and "-" positive and negative electrode logos on the side of the cell sleeve.
Rated capacity: [email protected];
Nominal voltage: 3.0V, nominal energy: 14.1Wh;
AC internal resistance: 15mΩ.
The contact surface of the negative electrode of the 32700-S01 cell is made of alloy metal, and the internal anode is made of hard carbon.
The positive contact surface of the 32700-S01 cell is also made of alloy, and the internal disc is connected with four solder joints.
Cube New Energy 32700-S01 The cylindrical height of the cell is about 70.4mm.
The cylindrical diameter of the 32700-S01 cell is about 32.3mm.
The weight of the 32700-S01 cell is about 129.4g.
The Cube New Energy 32700-S01 is slightly larger than the 26700-S01.
Cube New Energy 32700-S01 battery cells are placed in the palm of an adult man's hand, and the body size is slightly larger.
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 940mA, 0.2C to charge the cubic new energy 32700-S01 sodium-ion cell, the charging cut-off voltage is 3.9V, and it takes about 5 hours and 09 minutes.
0.5C charging
Draw a line diagram, set the current to 2350mA, 0.5C to charge the cubic new energy 32700-S01 sodium-ion cell, the charging cut-off voltage is 3.9V, and it takes about 2 hours and 15 minutes.
1C charging
Draw a line diagram, set the current to 4700mA, 1C to charge the 32700-S01 sodium-ion battery cell, the charging cut-off voltage is 3.9V, and it takes about 1 hour and 2 minutes.
In the charging test, it took 5 hours and 09 minutes to fully charge 0.2C, 2 hours and 15 minutes to fully charge 0.5C, and 1 hour and 20 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 940mA, 0.2C is the discharge of the cubic new energy 32700-S01 sodium ion cell, the average voltage is 3.05V, the cut-off voltage is 1.5V, it takes about 5 hours, the discharge capacity is 4708mAh, and the energy is 14.37Wh.
0.5C discharge
Draw a line diagram, set the current to 2350mA, 0.5C for the cubic new energy 32700-S01 sodium ion cell discharge, the average voltage is 3.04V, put to the cut-off voltage of 1.5V, it takes about 2 hours and 31 minutes, the discharge capacity is 4673mAh, and the release energy is 14.21Wh.
1C discharge
Draw a line diagram, set the current to 4700mA, 1C is the discharge of the cubic new energy 32700-S01 sodium ion cell, the average voltage is 3V, and the cut-off voltage is 1.5V, which takes about 1 hour and 14 minutes, and the discharge capacity is 4622mAh and the release energy is 13.89Wh.
Summarizing the test data into a table, it can be seen that the battery cell is discharged at three magnifications, and the shortest discharge time is 1C discharge, and the discharge time is about 1 hour and 14 minutes. The longest discharge time is 0.2C discharge, and the discharge time is about 5 hours.
The test data is summarized into a histogram, and the overall discharge energy in the discharge test is between 13.89-14.37Wh, and the overall gap is not large, among which the highest discharge energy is 0.2C discharge gear, and the discharge energy reaches 14.37Wh, which exceeds the nominal energy, and the lowest discharge energy is 1C discharge gear, and the discharge energy is 13.89Wh.
Let's take a look at the difference in the capacity of each gear, and draw the data into a curve graph, you can see that the 0.2C discharge gear has a discharge capacity of 4708mAh, and the lowest discharge capacity is 1C discharge gear with a discharge capacity of 4622mAh.
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 32700-S01 sodium ion cell is 15mΩ.
Drawing a histogram, we can see that the internal resistance of 3.9V is 5.23mΩ and the internal resistance of 1.5V is 5.71mΩ, both of which do not exceed the nominal internal resistance, and the difference between the two sets of data is small.
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
The 32700-S01 sodium-ion battery cell was charged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 25.8°C.
0.5C charging
Charge the 32700-S01 sodium-ion battery cell at a rate of 0.5C for 30 minutes, and the maximum surface temperature is about 25.2°C.
1C charging
The 32700-S01 sodium-ion battery cell was charged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 29.1°C.
Discharge temperature test
0.2C discharge
The 32700-S01 sodium-ion battery cell was discharged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 26.8°C.
0.5C discharge
The 32700-S01 sodium-ion battery cell was discharged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 27.6°C.
1C discharge
The 32700-S01 sodium-ion battery cell was discharged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 34.3°C.
Summary of the charging head network
This cubic new energy 32700-S01 sodium-ion cell, the charging head network was tested at 0.2C, 0.5C and 1C three rates, charging, 1C rate charging can be completed in 1 hour 02 minutes, discharge part, you can see that 0.2C rate discharge capacity 4708mAh, release energy up to 14.37Wh, all reached the nominal data.
In terms of temperature, the charging temperature is in the range of 26-29 °C after 30 minutes of charging and discharging at three different rates, and the charging temperature is in the range of 26-34 °C, the heat generated by charging is not large, and the temperature is high during discharge.
On the whole, this cubic new energy 32700-S01 sodium-ion battery cell has good performance in both charge and discharge tests, internal resistance and temperature tests, which is comparable to lithium-ion batteries, and sodium-ion batteries have low cost, low temperature and safety characteristics comparable to iron and lithium, and sodium batteries have greater development space in the future, in addition, cubic new energy plans to achieve 10GWh/year production capacity of sodium-ion batteries by the end of 2025. Contribute to the development of the sodium-ion battery industry chain and the achievement of the global dual carbon goal.