Foreword
Recently, the charging head network got a Chuangming CMICR18650F8L-2600mAh battery cell, with a single capacity of 2600mAh, Chuangming battery technology*** Founded on March 18, 2003, Chuangming has been committed to the research and development and manufacturing of cylindrical lithium-ion batteries, is one of the first enterprises to engage in the professional R&D and production of 18650 lithium batteries, and is the leader of domestic high-capacity cylindrical lithium battery productsThe following charging head network will comprehensively analyze the performance of this battery from charge and discharge, internal resistance and temperature test.
Appearance introduction
Let's take a look at the appearance and specifications of this battery cell first.
Chuangming CMICR18650F8L-2600mAh battery cell is a cylindrical design, using purple cell sleeve film color, and the sleeve film color can be adjusted according to requirements to meet the diverse needs of customers.
Chuangming CMICR18650F8L-2600mAh battery cell has a coded code on the other side
CMICR18650F8 and factory code" and "+" positive and negative electrode markings.
Typical capacity: 2600mah@02c；
Nominal voltage: 36v；Nominal energy: 936wh；
AC internal resistance: 25m.
Chuangming CMICR18650F8L-2600mAh battery cell anode contact surface is made of alloy metal material, anodized process, durable and anti-corrosion.
The contact surface of the positive electrode of Chuangming CMICR18650F8L-2600mAh battery cell is still made of alloy, and the connection of four solder joints of the disc is more stable.
Using plastic calipers, the height of the cylinder of Chuangming CMICR18650F8L-2600mAh cell is about 651mm。
Using plastic calipers, the diameter of Chuangming CMICR18650F8L-2600mAh cell is about 184mm。
The weight of the CMICR18650F8L-2600mAh battery cell is about 456g。
Chuangming CMICR18650F8L-2600mAh battery cell is relatively small in the hands of adult men.
Charge and discharge test
After looking at the appearance, let's get to the point;The following will be 02c、0.5C and 1C rates for charge and discharge tests.
Charge test
The charge test will be 02c、0.5C and 1C rates are used for constant current and constant voltage charging, and the total time consumption is counted.
0.2C charging
Draw a line chart with a current of 520mA, 02C is to charge the Chuangming CMICR18650F8L-2600mAh battery, and the charging cut-off voltage is 42V, it takes about 5 hours and 6 minutes.
0.5C charging
Draw a line chart and set the current to 1300mA, 05C is charged for Chuangming CMICR18650F8L-2600mAh cells, and the charging cut-off voltage is 42V, it takes about 2 hours and 14 minutes.
1C charging
Draw a line chart, set the current to 2600mA, 1C is to charge the Chuangming CMICR18650F8L-2600mAh cell, and the charging cut-off voltage is 42V, it takes about 1 hour and 18 minutes.
Plot the test data as a line chart, 0. in the charging testIt takes 5 hours and 06 minutes to fully charge 2C, 0It takes 2 hours and 14 minutes to fully charge at 5C and 1 hour and 18 minutes to charge at 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 chart with a current of 520mA, 02C is the discharge of Chuangming CMICR18650F8L-2600mAh battery cell, and the average voltage is 361V, put to the cut-off voltage of 275V, it takes about 4 hours and 53 minutes, the output capacity is 2448mAh, and the energy is 884wh。
0.5C discharge
Draw a line chart and set the current to 1300mA, 05C is Chuangming CMICR18650F8L-2600mAh cell discharge, with an average voltage of 358V, put to the cut-off voltage of 275V, it takes about 1 hour and 53 minutes, the output capacity is 2366mAh, and the energy is 848wh。
1C discharge
Draw a line chart, set the current to 2600mA, 1C is Chuangming CMICR18650F8L-2600mAh cell discharge, and the average voltage is 352V, put to the cut-off voltage of 275V, it takes about 55 minutes, the capacity is 2307mAh, and the energy is 812wh。
Summarizing the test data into **, 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 55 minutes. The longest discharge time is 02C discharge, the discharge time is about 4 hours and 53 minutes.
The test data is summarized into a histogram, and the overall discharge energy in the discharge test is 812-8.84wh;The overall gap is not large, and the highest discharge energy is 02C discharge gear, discharge energy up to 884Wh, basically reaching the nominal energy;The lowest discharge energy is the 1c discharge gear with a discharge energy of 812wh。
Let's take a look at the difference in the capacity of each gear, and plot the data as a graph, and you can see 0The discharge capacity of the 2C discharge gear is 2448mAh, and the lowest discharge capacity is 2307mAh of the 1C discharge gear.
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.
Summing up the test data to **, you can see that the fully charged internal resistance voltage is 42V, the air-electric internal resistance voltage is 275V, Chuangming CMICR18650F8L-2600mAh battery cell nominal internal resistance is 25M.
Draw out the histogram and you can see 4The internal resistance of 2V is 22 when fully charged12mω，2.The internal resistance of 75V is 2135m, none of which exceeded the nominal internal resistance, and the difference between the two sets of data was smallOutstanding performance.
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 Chuangming CMICR18650F8L-2600mAh battery cell is 02C rate for 30 minutes, the maximum surface temperature is 256 or so.
0.5C charging
The Chuangming CMICR18650F8L-2600mAh battery cell is 0Charge at 5C rate for 30 minutes, and the maximum surface temperature is 263 or so.
1C charging
Charge the Chuangming CMICR18650F8L-2600mAh battery cell at 1C rate for 30 minutes, and the maximum surface temperature is 313 or so.
Discharge temperature test
0.2C discharge
The Chuangming CMICR18650F8L-2600mAh battery cell is 0The discharge was carried out at a rate of 2C for 30 minutes, and the maximum surface temperature was 264 or so.
0.5C discharge
The Chuangming CMICR18650F8L-2600mAh battery cell is 0Discharge at 5C rate for 30 minutes, and the maximum surface temperature is 274 or so.
1C discharge
The Chuangming CMICR18650F8L-2600mAh battery cell was discharged at 1C rate for 30 minutes, and the maximum surface temperature was 348 or so.
Summary of the charging head network
This Chuangming CMICR18650F8L-2600mAh battery cell, the charging head network is at 02c、0.5C and 1C three magnification test, charging, 1C rate charging can be completed in 1 hour and 18 minutes, discharge part, you can see 0The 2C rate discharge capacity is 2448mAh, and the discharge energy reaches 884wh compared to the nominal parameter;The gap is large.
Internal Resistance and Temperature Performance, 4The internal resistance of 2V is 22 when fully charged12mω，2.The internal resistance of 75V is 2135m, none of which exceeded the nominal internal resistance, and the difference between the two sets of data was smallIn terms of temperature, the temperature was tested after 30 minutes of charging and discharging at three sets of different rates, and the charging temperature was in the range of 26-31The discharge temperature is in the range of 26-34, the charging heat is not large, and it is normal for the temperature to be high during dischargeOn the whole, Chuangming CMICR18650F8L-2600mAh cell, although the discharge capacity and energy do not reach the nominal data, but the temperature and internal resistance performance are relatively good.