Foreword
The INR18650MJ1 battery cell is one of LG Chem's flagship products, using the latest lithium-ion technology, with a single capacity of up to 3500mAh, and its reliable output capability makes it the first choice for many electronic devices. Its high capacity and long-lasting battery life provide powerful energy support for smart handhelds, portable power supplies, power tools, and other portable devices.
As a masterpiece of LG CHEM, LG INR18650MJ1 battery cells have not only achieved great success in the battery industry, but also demonstrated their excellent performance in many fields. Next, we will evaluate the performance of the cell in depth, and the charging head network will be tested from three aspects: charge and discharge, internal resistance and temperature, and comprehensively analyze the performance of this cell.
Appearance introduction
As usual, let's take a look at the appearance of this cell first.
LG INR18650MJ1 cells are cylindrical in design and use green cell sleeve color.
LG INR18650MJ1 has a cell coding on the other side
inr18650mj1 gc047b163n1”
Rated capacity: 3500mah@02c
Nominal voltage: 3635v；Nominal energy: 1272wh；
AC internal resistance: 40m
The contact surface of the negative electrode of LG INR18650MJ1 cell is made of alloy metal and treated by anodizing process, which is durable and anti-corrosion.
The positive contact surface of LG INR18650MJ1 cell is still made of alloy, and the disc is connected by four solder joints.
Using plastic calipers, the cylindrical height of LG INR18650MJ1 cell is about 654mm。
The diameter of the LG INR18650MJ1 cell column is about 183mm。
The LG INR18650MJ1 cell weighs about 464g。
LG INR18650MJ1 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;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 and set the current to 700mA, 02C is the charging of the Wolg INR18650MJ1 cell, and the charging cut-off voltage is 42V, it took about 5 hours and 08 minutes.
0.5C charging
Draw a line chart with a current of 1750mA, 05C is the charging of LG INR18650MJ1 cells, and the charging cut-off voltage is 42V, it takes about 2 hours and 33 minutes.
1C charging
Draw a line chart, set the current to 3500mA, 1C to charge the LG INR18650MJ1 cell, and the charging cut-off voltage is 42V, it takes about 1 hour and 51 minutes.
Plot the test data as a line chart, 0. in the charging testIt takes 5 hours and 08 minutes to charge 2C to fully charge, 0It takes 2 hours and 33 minutes to fully charge at 5C and 1 hour and 51 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 and set the current to 700mA, 02C is the discharge of LG INR18650MJ1 cells, and the average voltage is 365V, put to the cut-off voltage of 25V, it takes about 4 hours and 44 minutes, the release capacity is 3325mAh, and the energy is 1213wh。
0.5C discharge
Draw a line chart and set the current to 700mA, 05C is the discharge of LG INR18650MJ1 cells, and the average voltage is 359V, put to the cut-off voltage of 25V, it takes about 1 hour and 52 minutes, the output capacity is 3280mAh, and the energy is 1179wh。
1C discharge
Draw a line chart, set the current to 3500mA, 1C is LG INR18650MJ1 cell discharge, and the average voltage is 351V, put to the cut-off voltage of 25V, it takes about 56 minutes, the output capacity is 3271mAh, and the energy is 1147wh。
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 56 minutes. The longest discharge time is 02C discharge, the discharge time is about 4 hours and 44 minutes.
The test data is summarized into a histogram, and the overall discharge energy in the discharge test is 1147-12.between 13wh;The overall gap is not large, and the highest discharge energy is 02C discharge gear, discharge energy up to 1213Wh, basically reaching the nominal energy;The lowest discharge energy is the 1C discharge gear with a discharge energy of 1147wh。
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 3325mAh, and the lowest discharge capacity is the discharge capacity of the 1C discharge gear is 3271mAh.
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 25V, LG INR18650MJ1 cell nominal internal resistance is 40M.
Draw out the histogram and you can see 4The internal resistance of 2V is 28 when fully charged07mω，2.The internal resistance of 5V air power is 2913m, none of which exceeded the nominal internal resistance, and the difference between the internal resistance in the full and empty states was small, and the performance was 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
The LG INR18650MJ1 battery cell is 02C rate for 30 minutes, the maximum surface temperature is 278 or so.
0.5C charging
The LG INR18650MJ1 battery cell is 0Charge at 5C rate for 30 minutes, and the maximum surface temperature is 301 or so.
1C charging
The LG INR18650MJ1 battery cells were charged at 1C rate for 30 minutes, and the maximum surface temperature was 345 or so.
Discharge temperature test
0.2C discharge
The LG INR18650MJ1 battery cell is 0Discharge at 2C rate for 30 minutes, and the maximum surface temperature is 279 or so.
0.5C discharge
The LG INR18650MJ1 battery cell is 0Discharge at 5C rate for 30 minutes, and the maximum surface temperature is 281 or so.
1C discharge
The LG INR18650MJ1 cell was discharged at 1C rate for 30 minutes, and the maximum surface temperature was 355 or so.
Summary of the charging head network
This LG INR18650MJ1 battery cell has a charging head net of 02c、0.5C and 1C three rate test, charging, 1C rate charging can be completed in 1 hour and 51 minutes, and the discharge part can be seen 0The 2C rate discharge capacity is 3325mAh, which is close to the nominal capacity, and the same energy is 1213wh。
Let's take a look at the internal resistance and temperature performance, the internal resistance values in the empty power and full power state do not exceed the nominal internal resistance, and are about 28-29m, and the internal resistance in the two different states is not much changed, in terms of temperature, in three groups of different rates of charging and discharging for 30 minutes after testing the temperature, the charging temperature is in the 27-34 range, the discharge temperature is in the 27-35 range, in general, LG INR18650MJ1 battery cell with its high efficiency, Stable internal resistance and excellent temperature control provide reliable power support for portable devices. Near-nominal charging and discharging performance, well-controlled internal resistance and temperature, providing reliable power for a wide range of applications**.