1. Standard Test Conditions: 

Test should be conducted with new batteries within one week after shipment from our factory and the cells shall not be cycled more than five times before the test. Unless otherwise specified, test and measurement shall be done under temperature of 20±5℃ and relative humidity of 45~85%. If it is judged that the test results are not affected by such conditions, the tests may be conducted at temperature 15~30℃ and humidity 25~85%RH.

Test Conditions of Lithium Battery

2. Measuring Instrument or Apparatus:

1). Dimension Measuring Instrument: The dimension measurement shall be implemented by instruments with equal or more precision scale of 0.01mm.

2). Voltmeter: Standard class specified in the national standard or more sensitive class having inner impedance more than 10kΩ/V.

3). Ammeter: Standard class specified in the national standard or more sensitive class. Total external resistance including ammeter and wire is less than 0.01Ω

4). Impedance Meter: Impedance shall be measured by a sinusoidal alternating current method(1kHz LCR meter).

3. Standard Charge\Discharge:

1).  Standard Charge Test procedure and its criteria are referred as follows:

    Charging shall consist of charging at a 0.2C5A constant current rate until the cell reaches 8.4V. The cell shall then be charged at constant voltage of 8.4volts while tapering the charge current.  Charging shall be terminated when the charging current has tapered to 0.01 C5A . Charge time : Approx 6h, The cell shall demonstrate no permanent degradation when charged between 0 ºC and 45 ºC.

2).  Standard Discharge: Cells shall be discharged at a constant current of 0.2 C5A to 6 volts @ 20º  5C.

3).  If no otherwise specified, the rest time between Chare and Discharge amount to 30min.

4). Appearance: There shall be no such defect as flaw, crack, rust, leakage, which may adversely affect commercial value of battery.

5). Initial Performance Test :  Table 1

Item

Test Method and Condition

Requirements

(1)   Open-Circuit

Voltage

The open-circuit voltage shall be measured within 24 hours after standard charge.

≥8.3V

(2)   Internal impedance

Internal resistance measured at AC 1KHz after 50% charge.

≤160mΩ

(3)  Minimal Rated

 Capacity

The capacity on 0.2C5A discharge till the voltage tapered to 6V shall be measured after rested for 30min then finish standard charge.

Discharge Capacity

≥4000mAh

6). Temperature Dependence of discharge capacity:

      Cells shall be charged per 3.1 and discharged @0.2 C5A to 3.0 volts. Except to be discharged at temperatures per Table 2.  Cells shall be stored for 3 hours at the test temperature prior to discharging and then shall be discharged at the test temperature.  The capacity of a cell at each temperature shall be compared to the capacity achieved at 23 ºC and the percentage shall be calculated. Each cell shall meet or exceed the requirements of Table 2.

Table 2 

Discharge Temperature

-10℃

0℃

23℃

60℃

Discharge Capacity (0.2 C5A)

60%

80%

100%

95%

7). Cycle Life and Leakage-Proof: Table 3

Table 3

No.

Item

Criteria

Test Conditions

1

Cycle Life

(0.2C5A)

Higher than 70% of the Initial Capacities of the Cells

Carry out 300cycle

Charging/Discharging in the below condition.

◆Charge:Standard Charge, per 3.3.1

◆Discharge:0.2 C5A  to 6V

◆Rest Time between charge/discharge:30min.

◆Temperature:25℃

2

Leakage-Proof

No leakage

(visual inspection)

After full charge with standard charge, store at 60±3℃, 60±10%RH for 1 month.

The above content is provided by BENZO Energy technology Co., Ltd ( li-po-battery.com ). If you have any questions about lithium batteries, please contact us.

BENZO Energy technology Co.,Ltd is located in Shenzhen China. It  is  a  high-tech  enterprise specializing in Researching and manufacturing of polymer li-ion batteries.