2. UN38.3 refers to Section 38.3 of Part III of "Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria" specially formulated by the United Nations (UN) for the transport of dangerous goods, referred to as UN38.3. The latest version is ST/SG/AC.10/11/Rev.6 released in 2015, which is the sixth edition of UN38.3. There are 8 testing items in UN38.3 as below;
| No. | Item name | Test requirements |
| T.1 | Altitude simulation | The battery should be stored for at least 6 hours in an environment where the air pressure is less than or equal to 11.6Kpa. |
| T.2 | Temperature test | The battery was stored at -40 and 75°C ambient temperature for 6 hours each, and 10 cycles were completed. |
| T.3 | Vibration | The battery is fixed on the test bench for sine wave sweep vibration, the frequency range is 8~200Hz, the maximum acceleration is 8g, and the amplitude is 0.8mm. |
| T.4 | Shock | The battery is fixed on the test bench to withstand the mechanical shock with a maximum acceleration of 150g, and the pulse duration is 6ms. The specific test acceleration peak value will be based on the formula formulated by the standard T.4, and the acceleration will be calculated according to the weight of the battery and compared with 150g to take the smaller value. |
| T.5 | External short circuit | Under the ambient temperature of 57℃, externally short circuit the battery with a wire whose total internal resistance is less than 0.1 ohm. |
| T.6 | Impact/Squeeze | Impact (applicable to cylindrical battery cells with a diameter of ≥ 18mm): impact the battery cell from a height of 61cm with a weight of 9.8Kg, and squeeze (applicable to diamond, soft pack, button battery cells and diameter < 18mm cylindrical battery cell): put the battery cell on two planes and squeeze, the maximum squeeze pressure is 13KN. |
| T.7 | Overcharge | The battery charging voltage is not greater than 18V, use 2 times the maximum charging voltage or 22V, whichever is the smaller value to overcharge the battery. When the battery charging voltage is greater than 18V, use 1.2 times the maximum charging voltage to over-charge the battery. |
| T.8 | Forced discharge | A fully discharged battery is forcedly discharged at the maximum discharge current. |
3. In addition to the above eight tests, there are additional packaging requirements (1.2m drop test)
1. Unless installed in equipment (such as in mobile phones, cameras, walkie-talkies, notebook computers, etc.), batteries and primary batteries must be individually packaged to prevent short-circuiting, and installed in sturdy outer packaging.
2. Unless installed in equipment, each package containing more than 24 primary batteries or 12 batteries must also meet the following requirements:
1) Each package must be marked with lithium batteries and special measures to be taken when the package is damaged.
2) Each shipment must have a random document to explain the special measures to be taken when the lithium battery is contained in the package and the package is damaged.
3) Each package must be able to withstand a 1.2m drop test in any orientation without damaging the batteries or primary batteries in the package, and without changing the position of the batteries in them so that the batteries (or primary batteries and primary batteries) interact with each other. contact, no battery leaked from the package.
4) Unless lithium batteries are installed in the equipment, the gross weight of each package must not exceed 30kg.
Judgment standard after UN38.3 test:
Requirements 1 to 4 after the test, all tested batteries must have no mass loss, no deformation, no leakage, no leakage, no explosion, no fire, and the open circuit voltage must not be less than 90% of the open circuit voltage obtained before the test.
Item 5 after the test requires that the temperature of the battery under test should not exceed 170°C during the short-circuit test.
Items 5 to 6 after the test require that within 6H after the test, the battery must be free of deformation, breakage, and fire.
Items 7 to 8 after the test, within 7 days after the test, if there is no deformation, no fracture, and no fire phenomenon, the battery is considered to meet the requirements.