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UL Test Standard / Specifications for Li-Ion and packs

UL (Underwriters Laboratories) is an organization for testing and authenticating the products. UL is the symbol of safety for the consumers. UL is one of the most reliable qualified evaluating providers for the manufacturers on the global. UL 憇 test standard for Li-Ion Battery and pack is as the follows:

 

(1) Experiment of over-charging

     Charge for the electric cores with the constant current and set up the upper limit for the fixed voltage. The interior electric core will arise the dendrite in the cathode. Penetrating the membrane is most important threaten for passing this experiment.

Premise

Environmental temperature

Charging current

Experimental process

Time requirements

Result requirements

After charging according to the standards

20℃ +/- 5℃

Carry through the relative current and time .

             Ic= 2.5C / 3 tc

Here, C is the standard capability of battery, ICis the testing current.   tc is time ( hrs) to be test. => 48

The testing time cannot be below 48 hours.

No explosion and burning

(2) Experiment of short circuit

     Directly connect the conducting wire with the little resistance to the anode and cathode making the cell form the loop circuit with super heavy current and climb the interior temperature in the cell.

Premise

Environmental temperature

Methods of short circuit

Exterior resistance

Time

Result requirements

After charging according to the standards.

60℃ +/- 2℃

20℃ +/- 5℃

Connect anode and cathode with conducting wires

0.1 Ω

Till the temperature close to the environmental temperature.

No explosion, burning. The casing temperature can not be above 150℃

 

(3)  Experiment of acupuncture

    Penetrate the cell vertically with the iron needle. The interior circuit arises persistently.

Premise

Environmental temperature

Steel needle

Experimental process

Time requirements

Result requirements

After charging according to the standards

20℃+/- 5℃

 

Bounce to the cells at the minimum acceleration of 75g and the maximum acceleration of 125 175g within 3ms on the face and side face of cell.

No explosion and burning Ejection ≤ 5g

 

(4)   Thermal impact

     Put the electric core into the high temperature case. Ascend the temperature complying with the standard and regular speed. The persistent high temperature makes the interior membrane melt, which causes the interior short circuit with bulk areas.

Premise

Velocity of ascending temperature

Upper limit temperature

Time requirements

Result requirements

After charging according to the standards

5℃ +/- 2℃

150 ℃ +/-2℃

Ten minutes

No explosion and burning

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UN 38.3 Safety Test

We already set up our own UN38.3 testing lab. We can provide UN38.3 test service to our customer now.

If you want to set up your own lab, we also provide UN38.3 & IEC62133 equipments and onsite training. Email us for the quote and lead time.
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Lithium Battery Shipping Regulation
 
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