Preface
In today's world of pursuit of high performance and reliable energy, EVE has launched a new INR21700/40P battery cell with the concept of innovation and environmental protection. With its excellent performance and excellent stability, this battery cell demonstrates EVE's technical strength and innovation ability in the field of lithium batteries, and this battery cell marks a further breakthrough in the field of lithium batteries, with the characteristics of high capacity and high power output, providing stronger and more durable energy support for various electronic devices and applications.
Appearance introduction
As usual, let's take a look at the appearance of this cell first.
EVE's INR21700/40P battery cell is designed as a cylinder, using purple cell sleeve color, and the sleeve film color can be adjusted according to requirements to meet the diverse needs of customers.
EVE has a battery INR21700/40P battery on the other side of the cell code:
"INR21700/40P HMFDCiZ439625" 及"+"、"-"正负极标识;
Rated capacity: [email protected];
Nominal voltage: 3.6V, nominal energy: 14.4Wh;
AC internal resistance: ≤13mΩ.
EVE's INR21700/40P battery cell anode contact surface is made of alloy metal material, anodized process, durable and anti-corrosion.
The contact surface of the cathode of EVE's INR21700/40P battery cell is still made of alloy, and the disc is connected by three solder joints.
Using plastic calipers, the height of the cylinder of EVE's INR21700/40P battery cell is about 70.3mm.
Using plastic calipers, the diameter of EVE's INR21700/40P cell column is about 21.1mm.
亿纬锂能INR21700/40P电芯重量约为65.6g。
EVE's INR21700/40P battery cells are relatively small in the hands of adult men.
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 800mA, 0.2C to charge EVE's INR21700/40P battery, and the charging cut-off voltage is 4.2V, which takes about 5 hours and 12 minutes.
0.5C charging
Draw a line diagram, set the current to 2000mA, 0.5C to charge EVE's INR21700/40P battery, and the charging cut-off voltage is 4.2V, which takes about 2 hours and 13 minutes.
1C charging
Draw a line diagram, set the current to 4000mA, 1C is EVE's INR21700/40P battery charging, the charging cut-off voltage is 4.2V, and it takes about 1 hour and 14 minutes.
The test data is plotted as a line chart, and it takes 5 hours and 12 minutes to fully charge 0.2C, 2 hours and 13 minutes to fully charge 0.5C, and 1 hour and 14 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 800mA, 0.2C is the discharge of EVE's INR21700/40P cells, the average voltage is 3.66V, and the cut-off voltage is 2.5V, which takes about 5 hours and 06 minutes, with a discharge capacity of 4085mAh and an energy of 14.96Wh.
0.5C discharge
Draw a line diagram, set the current to 2000mA, 0.5C is the discharge of EVE's INR21700/40P cells, the average voltage is 3.65V, and the cut-off voltage is 2.5V, which takes about 2 hours, with a discharge capacity of 4006mAh and an energy of 14.62Wh.
1C discharge
Draw a line diagram, set the current to 4000mA, 1C is the discharge of EVE's INR21700/40P cells, the average voltage is 3.62V, and the cut-off voltage is 2.5V, which takes about 23 minutes, and the output capacity is 3946mAh and the energy is 14.29Wh.
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 23 minutes. The longest discharge time is 0.2C discharge, and the discharge time is about 5 hours and 6 minutes.
The test data is summarized into a histogram, and the overall discharge energy in the discharge test is between 14.29-14.96Wh, and the overall gap is not large, among which the highest discharge energy is 0.2C discharge gear, and the discharge energy reaches 14.96Wh, which exceeds the nominal energy, and the lowest discharge energy is 1C discharge gear, and the discharge energy is 14.29Wh.
Let's take a look at the difference in the capacity of each gear, draw the data into a curve graph, you can see that the 0.2C discharge gear has a discharge capacity of 4085mAh, and the lowest discharge capacity is 1C discharge gear with a discharge capacity of 3946mAh.
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 4.2V, the air internal resistance voltage is 2.75V, and the nominal internal resistance of EVE INR21700/40P battery cell is ≤13mΩ.
Drawing the histogram, you can see that the 4.2V full-charge internal resistance is 9.47mΩ, and the 2.5V air-electric internal resistance is 9.56mΩ, 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
EVE INR21700/40P battery cells are charged at a rate of 0.2C for 30 minutes, and the maximum surface temperature is about 24.9°C.
0.5C charging
EVE's INR21700/40P battery cells are charged at a rate of 0.5C for 30 minutes, and the maximum surface temperature is about 25.8°C.
1C charging
The EVE INR21700/40P battery cells were charged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 28.7°C.
Discharge temperature test
0.2C discharge
EVE's INR21700/40P battery cells were discharged at a rate of 0.2C for 30 minutes, and the maximum surface temperature was about 25.3°C.
0.5C discharge
The EVE lithium INR21700/40P battery cell was discharged at a rate of 0.5C for 30 minutes, and the maximum surface temperature was about 26.8°C.
1C discharge
The EVE lithium INR21700/40P battery cells were discharged at a rate of 1C for 30 minutes, and the maximum surface temperature was about 29.4°C.
Summary of the charging head network
This EVE lithium energy INR21700/40P battery, 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 and 14 minutes, and the discharge part can be seen that the 0.2C rate discharge capacity is 4085mAh, and the release energy reaches 19.46Wh, which exceeds the nominal parameters and performs well.
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 25-29 °C, and the discharge temperature is in the range of 25-30 °C, and the overall calorific value is not large.
EVE's launch of INR21700/40P battery cells is not only a progress in battery technology, but also represents a breakthrough in environmental protection and sustainability. Its excellent performance, safety and environmental protection features provide a new choice for electronic equipment and energy, bringing more reliable and efficient energy support to users' lives and work.
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