Foreword
Recently, the charging head network got the old brand EVE in the battery field and launched an INR18650 33V battery cell, with a single cell capacity of 3200mAh, and its material formula is ternary lithium, which supports 05C charging, 3C discharge, is a small capacity power battery, EVE was established in 2001, is an old brand in the field of batteries, with consumer battery and power battery core technology and comprehensive solutions, products are widely used in the Internet of Things, energy Internet and other fields;The following charging head network will comprehensively analyze the performance of this battery from charge and discharge, internal resistance and temperature test.
Appearance introduction
As usual, let's take a look at the appearance of this cell first.
EVE INR18650 33V battery cell is a cylindrical design, using the color of cyan cell sleeve, and the color of the sleeve film can be adjusted according to the requirements to meet the diverse needs of customers.
EVE INR18650 33V battery cell has a coded code on the other side
INR18650 33V and LLEH23T043428 (factory code)" and "+" positive and negative pole markings.
Rated capacity: 3200mah@02c；
Nominal voltage: 36v；Nominal energy: 1152wh；
AC internal resistance: 30m.
EVE INR18650 33V battery cell anode contact surface is made of alloy metal material, anodizing process, durable and anti-corrosion.
The contact surface of the positive electrode of EVE INR18650 33V 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 EVE INR18650 33V battery cell is about 652mm。
Using plastic calipers, the diameter of EVE's INR18650 33V cell is about 182mm。
EVE INR18650 33V battery cell weighs about 461g。
EVE INR18650 33V 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 and set the current to 640mA, 02C is to charge EVE INR18650 33V cells, and the charging cut-off voltage is 42V, it takes about 4 hours and 31 minutes.
0.5C charging
Draw a line chart and set the current to 1600mA, 05C is charged for EVE INR18650 33V cells, and the charging cut-off voltage is 42V, it takes about 1 hour and 32 minutes.
1C charging
Draw a line chart and set the current to 3200mA, 05C is charged for EVE INR18650 33V cells, and the charging cut-off voltage is 42V, it takes about 1 hour and 5 minutes.
Plot the test data as a line chart, 0. in the charging testIt takes 4 hours and 31 minutes to charge 2C to fully charge, 0It takes 1 hour and 52 minutes to fully charge at 5C, and 1 hour and 5 minutes to charge with 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 600mA, 02C is the discharge of EVE INR18650 33V battery cells, with an average voltage of 365V, put to the cut-off voltage of 25V, it takes about 4 hours and 32 minutes, the discharge capacity is 2994mAh, and the release energy is 1092wh。
0.5C discharge
Draw a line chart and set the current to 1600mA, 05C is EVE INR18650 33V cell discharge, with an average voltage of 361V, put to the cut-off voltage of 25V, it takes about 1 hour and 56 minutes, the release capacity is 2936mAh, and the release energy is 1059wh。
1C discharge
Draw a line diagram, set the current to 3200mA, 1C is the discharge of EVE INR18650 33V cells, and the average voltage is 361V, put to the cut-off voltage of 25V, it takes about 52 minutes, the capacity is 2893mAh, and the energy is 1025wh。
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 52 minutes. The longest discharge time is 02C discharge, the discharge time is about 4 hours and 32 minutes.
The test data is summarized into a histogram, and the overall discharge energy in the discharge test is 1025-10.Between 92wh;The overall gap is not large, and the highest discharge energy is 02C discharge gear, discharge energy up to 1092Wh, exceeding nominal energy;The lowest discharge energy is the 1c discharge gear with a discharge energy of 1025wh。
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 2994mAh, and the lowest discharge capacity is the discharge capacity of the 1C discharge gear is 2893mAh.
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, EVE INR18650 33V battery cell nominal internal resistance is 30M.
Draw out the histogram and you can see 4The internal resistance of 2V is 20 when fully charged67m with an internal resistance of 2178m, none of which exceeded the nominal internal resistance, 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
EVE INR18650 33V battery cell with 0Charge at 2C rate for 30 minutes, and the maximum surface temperature is 269 or so.
0.5C charging
EVE INR18650 33V battery cell with 0Charge at 5C rate for 30 minutes, and the maximum surface temperature is 277 or so.
1C charging
EVE INR18650 33V battery cells were charged at 1C rate for 30 minutes, and the maximum surface temperature was 325 or so.
Discharge temperature test
0.2C discharge
EVE INR18650 33V battery cell with 0The discharge was carried out at 2C rate for 30 minutes, and the maximum surface temperature was 282 or so.
0.5C discharge
EVE INR18650 33V battery cell with 0Discharge at 5C rate for 30 minutes, and the maximum surface temperature is 283 or so.
1C discharge
EVE INR18650 33V battery cells were discharged at 1C rate for 30 minutes, and the maximum surface temperature was 345 or so.
Summary of the charging head network
This EVE INR18650 33V lithium-ion battery cell has a single cell capacity of 3200mAh, and supports up to 1C charging and 3C discharge, which can be applied to different fields such as two-wheeled electric vehicles, A**, robots, mobile power supplies, home energy storage, etc., and the charging head network is 02c、0.5C and 1C three rate test, charging, 1C rate charging can be completed in 1 hour and 52 minutes, discharge part, you can see 0The discharge capacity of 2C rate discharge is 2994mAh, which is far from the nominal capacity, and the discharge energy reaches 1092wh, and the discharge capacity of the other two groups is also far from the nominal capacity.
In terms of temperature, the temperature is tested after 30 minutes of charging and discharging at three different rates, the charging temperature is lower and the difference between the three groups of magnifications is smaller, and the discharge temperature is higher, and the discharge temperature reaches 345. On the whole, this EVE INR18650 33V battery is decent in terms of charging time, discharge capacity, internal resistance and temperature performance.