سلول باتری لیتیوم یون LISHEN ,

1    SCOPE
The product specification describes the requirements of the Cylindrical Lithium-ion Cell to be supplied to the customer by Tianjin Lishen Battery J/S Co.,Ltd.. Should there be any additional information required by the customer, customer are advised to contact Tianjin Lishen Battery J/S Co.,Ltd..
2    De script ion and MODEL
2.1    De script ion : Cylindrical Lithium Ion Cell
2.2    Model : LR2170SA
3    GENERAL SPECIFICATIONS
3.1    Nominal Capacity : 4000mAh (at 0.2C Discharge)

          Minimum Capacity : 3900mAh (at 0.2C Discharge)
Nominal capacity is measured by the discharge at 0.2C to 2.75V end voltage after standard fully charged according to specification at 25℃.
3.2    Maximum Charge Voltage : 4.20V
3.3    Average working Voltage : 3.65V@0.2C
3.4    Standard Charge Method : Constant Current and Constant Voltage (CC/CV)

Current : 0.5C (2000mA)    
Voltage : 4.2V
End Current : 80mA±5mA
3.5    Maximum Charge Current

0℃ ≤   T ≤ 5℃           0.1C (400mA)
5℃ <   T ≤ 15℃           0.2C (800mA)
15℃ < T ≤ 45℃           0.5C (2000mA)
3.6    Standard Discharge   Constant Current (CC)
Current                         0.5C (2000mA)
End Voltage                 2.75V
3.7    Maximum Discharge Current                                 -20-5℃     1.0C (2000mA)
                                                                                          5-45℃     3.0C (12000mA)
                                                                                          45-60℃    1.5C (6000mA)
3.8    Cycle Life                                                               1000th cycle ≥80% of 1st Capacity (0.5C/1.0C at 25℃)
If discharged at high rate and high temperature frequently, cell cycle life will be shorten.
3.9    Weight of Bare Cell                                                        68±2g    
3.10 Operating Enviromental Temperature                    

Charge       0°C ~ 45 °C

Discharge                         -20°C ~ 60°C
3.11 Storage Temperature

1 month                             -20°C ~60°C
3 months                            -20°C ~ 40 °C
12 months                           -20℃~ 20 °C
 
4    OUTLINE DIMENSION (UNIT: mm)
Dimension: Diameter 21.7±0.2mm, Height 70.9±0.2mm. Refer to the attached drawing 1.
       
5    APPEARANCE    
There shall be no such defect as deep scratch, flaw, crack, rust, leakage, which may adversely affect commercial value of the cell.
6    TEST CONDITION and DEFINITIONS    
6.1    Measuring Equipment    
1.    Voltmeter    
Inner impedance>1000Ω/V.    
2.    Ampere-meter    
Total external resistance(ammeter and wire)<0.01Ω.    
3.    Slide caliper    
The slide caliper should have a scale of 0.02mm.    
4.    Impedance meter    
The impedance meter should be operated at AC 1kHz.    
6.2    Unless otherwise specified, all tests shall be performed at 25±2°C and humidity of 65±20% RH.
               The cells used for the test mentioned should be new ones delivered a week before at most.
6.3    All tests shall be performed at the same charge voltage, per 7.1.
6.4    Definitions    :
C Rate (“C”): The rate (milliamperes) at which a fully charged cell is discharged to its end voltage in one (1) hour.
7    CHARACTERISTICS    
7.1    Charge method    
7.1.1 Charging shall consist of charging at a 0.5C constant current rate until the cell voltage reaches 4.2V.
The cell shall then be charged at constant voltage of 4.2 volts while tapering the charge current. Charging shall be terminated when the charging current has tapered to 0.02C.
7.1.2 Charging shall consist of charging at a 0.5C constant current rate until the cell voltage reaches 4.2V.
The cell shall then be charged at constant voltage of 4.2 volts while tapering the charge current.
Charging shall be terminated when the charging current has tapered to 0.05C.
7.2    Discharge method    :
7.2.1 Cells shall be discharged at a constant current of 0.2C to 2.75 volts
7.2.2 Cells shall be discharged at a constant current of 0.5C to 2.75 volts
7.2.3 Cells shall be discharged at a constant current of 1.0C to 2.75 volts
7.2.4 Cells shall be discharged at a constant current of 2.0C to 2.75 volts
7.3    Weight of Bare Cell    
Meet 3.9 by balance.    
7.4    Internal Impedance    
The impedance shall be measured at AC 1k Hz initially.
Initial Internal Impedance ≤ 25mohm.    
7.5    Discharge Rate characteristics    
Cells shall be charged per 7.1.1 (0.5C) at 25ºC and discharged per 7.2.1(0.2C), 7.2.2 (0.5C), 7.2.3 (1C), 7.2.4 (2C) at 25ºC. The discharge capacity of each cell at respective discharge rate shall be compared with the discharge capacity at 0.2C and the percentage shall be calculated. Each cell shall meet or exceed the requirements of Table 1.
   

7.6    Cycle Life    
Charge cells per 7.1.2. Rest 15 minutes. Discharge per 7.2.3. Rest 15 minutes before recharge. The test enviromental temperature is 25± 2ºC. A cycle is defined as one charge and one discharge. Discharge capacity shall be measured after 1000 cycles.
Discharge capacity (1000th Cycle) ≥80% of 1st Cycle Capacity
7.7 Storage Characteristics    
After charge as per 7.1.1, store the testing cells at 25±2ºC for 28 days. Then discharge as per 7.2.2.The residual discharge capacity≥90% of Initial capacity
7.8 Temperature Characteristics    
Cells shall be charged per 7.1.1(0.5C) and discharged per 7.2.2. Cells, full charged, 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 25ºC and the percentage shall be calculated.   Each cell shall meet or exceed the requirements of Table 2.
 

8    MECHANICAL    
8.1. drop test    
After charge as per 7.1.1, The cell is freely drop ped from 1m above a wood floor for 3 times. (top 1 time, bottom 1 time and side1 time)
Criteria:    No Rupture, No Smoke, No Explosion, No Fire
8.2. Vibration test    
Cell charged per 7.1.1 are vibrated for 90minites per each of the three mutually perpendicular axis (x, y, z) with total excursion of 0.8mm, frequency of 10HZ to 55 HZ and sweep of 1HZ change per minute
Criteria:    No Rupture, No Smoke, No Explosion, No Fire
9    SAFETY    
9.1. External Short-circuiting Test at 25 ºC
Cell fully charged per 7.1.1, is to be short circuited by connecting the positive (+) and negative (-) terminals with a total external resistance of less than 50mohm. Stop the test when the cell voltage falls below 0.1V and the cell case temperature has returned to a value within 10 ºC of the original testing temperature. Criteria:    No Explosion, No Fire

9.2. Overcharge Test    
Cell fully charged per 7.1.1, is to be overcharged with 1.0C to 6.3V while tapering the charge current. Charging is continued for 7 hours.Monitoring change of cell temperature during testing. Stop the test when cell temperature decays to room temperature. Criteria:    No Explosion, No Fire
9.3   Overdischarge Test    
        Cell fully charged per 7.1.1, is discharged at constant current of 1.0C to 90min;
Criteria:    No Explosion, No Fire
9.4. Heating Test    
Cell fully charged per 7.1.1, is to be placed in the hot oven.Store the testing cells connecting with thermocouple in constant temperature box, heating the cells and box(speed of ascending temperature is 5ºC±2ºC per min) together at room temperature simultaneity, monitor the temperature change of the box, keep for 30 minutes after the box temperature reaches 130ºC±2ºC,then stop the test. Criteria:    No Explosion, No Fire
9.6   Crush Test    
Cell, charged per 7.1.1, is to be crushed between two flat surfaces and with cell longitudinal axis parallel to the flat surfaces of the crushing apparatus.The force for the crushing is to be applied by a hydraulic ram with a 1.25 inch (32 mm) diameter piston. The crushing is to be continued until a pressurereading of 2500 psig (17.2 MPa) is reached on the hydraulic ram, applied force of 3000 pounds (13 kN). Once the maximum pressure has been obtained it is to be released.
Criteria:    No Explosion, No Fire
10 GUARANTEE    
Cells are guaranteed to be free from defects in workmanship and materials for a period of one year provided that the manufacturer can confirm such defects are coming from manufacturing abnormality and not from abusive usage, or else manufacturer will solve the quality problem. Lishen won’t replace a new cell for free if the defects are not due to the failure of manufacturing process or is due to customer’s abuse or misuse.
10.1. Lishen will not be responsible for trouble occurred by handling outside of the precautions in instructions.
10.2. Lishen will not be responsible for trouble occurred by matching electric circuit, cell pack and charger.
10.3. Lishen will be exempt from warrantee any defect cells during assembling after acceptance.
11    PACKAGING    
Loading 64 cells per box, 2 boxes per case for a total of 128 cells. Sketch map refer to attached drawing 2
12    OTHERS    
Any matter not included in this specification shall be confered between the both parties.
13 SHIPPING    
The capacity of delivery cell is under 30%SOC. It is not specified more than 30% capacity remain at customer, because of self-discharge. During transportation, keep the cell from acutely vibration, impacting, solarization, drenching.