w w w . f u l l w a t . c o m
LIR18650-34
•
Li-ion cylindrical rechargeable battery
6.5 Cycle Life
Charge cells per 6.1. 2. Rest 15 minutes. Discharge per 6.2.3. Rest 15 minutes before recharge. The test
environmental temperature is 25ºC±2ºC. A cycle is defined as one charge and one discharge. Discharge
capacity shall be measured after 500 cycles.
Discharge capacity (500th Cycle) ≥ 70% of 1st Cycle Capacity
6.6 Storage characteristics
After charge as per standard charge method 6.1.1, store the testing cells at 25ºC±2ºC for 28 days. Then
discharge as per 6.2.2. Then the same cell is fully charged as per 6.1.1 again and discharged a second time
and measured as per 6.2.2.
The recovery discharge capacity (2nd discharge capacity) ≥90% of Initial capacity.
6.7 Temperature Characteristics
Cells shall be charged per standard charge method and discharged per 6.2.3. 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.
Table 2
-10ºC
0ºC
25ºC
45ºC
≥70%
≥80%
100%
≥95%
7. SAFETY
7.1 External short-circuiting. Test at 25ºC
Cell charged per standard charge method, is to be short circuited by connecting the positive (+) and negative
(-) terminals with a total external resistance of 80±20mohm. Stop the test when the cell voltage falls below 0.1V
and the cell case temperature has returned to a value within 10ºC of the original testing temperature.
Criteria:
No Fire, No Explosion
7.2 Overcharge test
Cell charged per standard charge method, is to be overcharged with 3C to 4.2V while tapering the charge
current. Monitoring change of cell temperature during testing. The charge duration is 7 hours. Stop the test
when cell temperature decays to room temperature.
Criteria:
No Fire, No Explosion
873 Overdischarge test
Cell charged per standard charge method, is discharged at constant current of 1C for 90min.
Criteria:
No Fire, No Explosion
7.4 Heating test
Cell charged per standard charge method, 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 Fire, No Explosion
