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Battery testing and standards
  Provice Date:2001/8/19   
BATTERY TESTING AND STANDARDS

1:Capacity
   The discharge capacity is taken by discharging the battery at the discharge current under the ambient temperature as set forth in the specification. The charge before and after the above discharge must be carried out in the method indicated in the specification in the specification, discharge the battery at0.25CA up to 3.5V/4V,5.25V/6V and 10.5V/12V battery.
   In each case the discharging time must be no less than 180minutes. The charge will be performed under the conditions of 4.8-5.0V/4V, 7.2-7.5V/6Vand 14.4V-15.0V/12V battery(Maximum current: less than 0.4CA).

2:Cyclic Life Test
This test is carried out under the ambient temperature and the charge/discharge conditions an required by the specification, in case the charge/discharge conditions are not set forth in the specification, the charge and discharge must be repeated under the ambient temperature at 25℃/77°F, the resist-anceload discharge current is 0.25CA, discharge cut-off voltage of discharge: 1.75V/Cell max.current 0.4CA or less for charge .the cyclic life must be held at 50%of the initial discharge capacity and last for at least 150 cycles.

3:Overcharge Test
The fully charged battery is overcharged in this test at the constant current of 0.1CA for 48 hours, and then stands for one hour. Then the battery is continuously discharged at a constant current of 0.05CA until it discharges to an average of 1.75Vper cell.
   The appearance of tested battery after the test must be free of irregular conditions, and the capacity should be95% or the nominal capacity.

4:Sealing Test
The following functions must be satisfied by the fully charged battery after it is overcharged for 48 consecutive hours at a 0.1CA current and for 24 consecutive hours at a 0.005CA current.
(a):Sealing Reaction Efficiency  
The sealing reaction efficiency must be 90% or more of the quantity of electricity which is converted by 25℃(77°F)1atm per Ah.
(b):Safety valve Function
The safety valve must be opened or closed without fail within the range of internal pressure of the battery from 30kpa to 50kpa.
(c):Safety 
The battery must be free of leaks and other defects.

5:storage Test
The fully charged battery will be stored for 6 months under the temperature of 20±5℃ (68±9°F)the dischargedcontinually at the constant current of 0.05CA up to the average cut-off voltage of discharge of 1.75V/per cell. The capacity at this time must be 60% or more of the nominal capacity.

6:vibration Test
   a vibration of 1000 cycles per minute at the full amplitude of 4mm will be applied on any side of the fully charged battery for 60min.then check to if the battery has endured against the the vibration, test without any broken parts or leaks , and its terminal voltage is hold higher than the nominal voltage.

7:Shock Test
The fully charged battery will be dropped three times without applying any extra force from 0.2m high onto a harden wood (about 50mm thick) Then check to see if the battery has endured in the test without noticeable breakage or leaks, and its terminal voltage is held higher than the nominal voltage.

8:Other Tests
Other tests, if required by the specification,shall be conducted according to the instructions given in the specification.


author:Admin