Quality Control (QC)

SUNEOM Battery has always strived to deliver the highest quality products to its over 1500 customers. Stringent process controls govern all manufacturing activities. Quality engineers are highly involved in evaluating the quality and reliability of all products manufactured both in the design and production stages. Our quality controls are emphasized throughout our manufacturing process to maximize customer satisfaction.

Our emphasis are:

• All of our engineers and technicians undergo training course regularly, in order to make the production more efficient and effective.

• All products from raw material to finished product are subjected to over 120 quality tests.

• All processes are based on ISO 9001 standard, implement 6Q management completely.

• Guarantee all of the SUNEOM batteries with 100% pass 120 quality tests before output.

QUALITY TEST
The following is a list of tests that SUNEOM products go through to ensure quality.

CAPACITY TEST
Batteries are discharged at the 0.3C rate. After 150 minutes of continuous discharge the battery voltage under load must be 1.75 volt/cell to pass.

HIGH LOAD TEST
A load of 2 C amps is applied for 5 minutes while the terminal voltage is monitored. To pass, the voltage must be >11.88 volt/ per battery.

VISUAL INSPECTION
Batteries are inspected for proper appearance of battery case, terminals, seals, markings, and the absence of electrolyte leakage. Several samples each day are checked for compliance with specified dimensions and tolerances.

CAPACITY TEST – MEDIUM LOAD
Samples are fully charged, then discharged at ambient temperature at the 0.2C rate to a final voltage of 1.7 volt/cell. The discharge time must be no less then 4 hours.

CAPACITY TEST – HIGH LOAD
Fully charged batteries are discharged at 77°F and 25°C at the 2C rate to an end voltage of 1.35V/cell. The expected discharge time is >15 minutes.

SHELF LIFE TEST
Fully charged batteries are stored for 2 1/2 weeks at 131°F (55°C). A discharge test performed at ambient temperature applying a load of 0.2C rate to 1.7V/cell must yield a run time of at least 3 hours, i.e. the capacity loss resulting from self-discharge must not exceed 50%.

VIBRATION TEST
Sample batteries are subjected to vibration is any direction at the rate of 2000 cycles per minute and amplitude of 0.1 inch (2.5mm) for 2 hours. No signs of damage, leakage, or change in electrical characteristics are expected.

OVERCHARGE TEST
Fully charged batteries are overcharged at the rate of 0.1C amps for 48 hours and then is expected to produce a run time of 8.5 hours, or at least 95% of initial capacity, and an absence of problem signs.

RELIEF VALVE TEST (UL924)
A fully charged battery is submerged in a tank filled with mineral oil and charged at 0.4C amps. This overcharge is to demonstrate the proper functioning of the safety relief valve. The release of excess gasses through the vent is demonstrated by bubbles rising from the battery.

CYCLE LIFE TEST
At an ambient temperature of 77°F and 25°C sample batteries are discharged at the 0.2C rate to 1.7V/cell and recharged at the 0.25 rates up to 2.5V/cell until charge current drops 0.01C amps. At least 200 cycles must be obtained before the capacity drops below 60% of initial capacity.