Wholesale lithiumbattery Rechargeable Lithium Polymer 18650 cell for Electric Bike and Electric Scooter

Test condition:Temperature : 22.5±2.5℃

discharge capacity at -10℃/ discharge capacity at 25℃  ≥ 70%;

discharge capacity at 0℃/discharge capacity at 25℃      ≥ 80%;

discharge capacity at 60℃/discharge capacity at 25℃     ≥ 95%

Test condition:

Charge: CC/CV 0.5C(1375mA) 4.2V cut off current: 0.01C(28mA);

stored at 25℃ for 30 days

Discharge: CC 0.5C(1375mA); End-of-discharge Voltage: 2.5V

Residualcapacityafter 30days storage/Minimum capacity ≥ 90%;

Recovercapacityafter 30days storage/Minimum capacity  ≥ 95%

Item

Permissible time

45 °C ~ 60 °C, 60% RH Max

Less than 1 month

25 °C ~ 45 °C, 60% RH Max

Less than 3 months

-20 °C ~ 25 °C, 60% RH Max

Less than 1 year

About long time storage:
If the cell needs to be stored for a long time, the cell’s storage voltage should be 3.6 ~ 3.9 V. Also, it is recommended to
charge the cell every six months.

After standard fully charge, cell shall be attached to a vibration table directly and subjected to vibration that consists of 10
Hz to 55 Hz to 10 Hz at the speed of 1Hz/min in 90~100mins.The total excursion of the vibration is 0.8mm(0.060 inches). The cell
shall be vibrated in each direction along axis of the cylinder and the vertical directions of axis of the cylinder.

The cell is discharged following the standard discharge method. Apply a 12V power supply and a 1C charge current for 1.5hrs.

Cell shall first be charged according to standard charge method，and then cell is to be discharged by 0.2C current for
12 hours; The test is completed when the cell is to be discharged up to 250% of rate capacity or the other protective devices
prevent the discharge.

The cell is charged following the standard charge method. After charging the cell is put in the oven. And then the oven
temperature will be ramped at 5℃ per minute to 130℃ and held at 130℃. When the temperature of the cell reach 130℃, the cell is
maintained in the 130℃ oven for a maximum of 60 minute or until a fire or explosion is obtained, whichever comes first. Record the
time that the cell temperature reaches 130℃ and the time when a fire or explosion occurs.

Crush test

No fire、No explode

After charging a cell following the standard charge method, the cell shall be crushed between two flat surfaces. The direction of
the crushing force shall be vertical to axis of the cylinder. The crushing force is to be applied by a hydraulic ram with a 32mm
diameter piston. Crushing force is approximately 13 KN. Once the maximum pressure has been obtained it is to be released.

Impact test

No flame、No fire、No explode

Cell shall first be charged according to standard charge method，then the battery cell was placed on a flat surface so that the
longitudinal axis of the battery cell shall be parallel with it.
A 15.8mm diameter bar is to be placed across the center of the sample. A.9.1kg weight is to be dropped from a height of 61cm on
the sample.

Short circuit test

No fire、No explode

Cell shall first be charged according to standard charge method, and then cell is to be short-circuited by connecting the positive
and negative terminals of the cell with copper wire having a maximum resistance load of 100mΩ. This test is done at room
temperature and at 60℃ (different cells). Monitor the cell temperature while testing. The cell is continuously discharged until
the cell case temperature has returned to be 10℃ less then peak temperature.

Incineration test

When subjected to the test no part of exploding cell shall penetrate from the screen such that some or all the cell or battery
protrudes through the screen

After full charging by the standard method, each test sample cell or battery is to be placed on a platform table having a 4-inch
diameter hole in the center covered by a screen. The screen over the hole is to be steel wire mesh having 20 openings per inch and
a wire diameter of 0.017 inch An eight-sided covered wire cage, 2 feet across and 1 foot high is covered with a metal screen is
to be constructed from 0.010inch diameter wire with 16-18 wires per inch in each direction. This wire cage is placed over to the
test sample. The sample is to be placed on the screen covering the hole in the center of the hole. It is to be heated until it
explodes, or until it is destroyed.

All above safety tests will be conducted at 22.5℃±2.5℃ except where specified differently. Use proper ventilation with protective equipment