Understanding UN38.3

Almost all lithium polymer battery need to pass Article 38.3 of the UN Manual and Criteria to ensure the safety of lithium polymer battery during transportation.

Our LiPol company can help customers to apply the UN38.3 test report. Each test takes one month, after then you will get a UN38.3 test report. More information please contact us.

UN38.3

UN38.3 Test Report

UN/DOT 38.3 Transportation Testing for Lithium polymer Battery 6th edition was issued in 2011. It include eight sections.

T.1.: Altitude simulation

T.2.: Thermal test

T.3.: Vibration

T.4.: Shock

T.5.: External short circuit

T.6.: Impact/Crush

T.7.: Overcharge

T.8.: Forced discharge

Test Data

T.1.: Altitude simulation

ClauseRequirement + TestResultVerdict
38.3.4.1Test T.1: Altitude simulationP
Test cells and lithium polymer battery shall be stored at a 11.6 kPa or less for at least six hours at ambient temperature 20±5℃.P
Cells and lithium polymer battery meet this requirement if there is no mass loss, no leakage, no venting, no disassembly, no rupture and no fire and if the open circuit voltage of each test cell or battery after testing is not less than 90% of its voltage immediately prior to this procedure. The requirement relating to voltage is not applicable to test cells and batteries at fully discharged states.No leakage, no venting, no disassembly, no rupture and no fire.P

T.2: Thermal test

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Clause Requirement + Test Result Verdict
38.3.4.2 Test T.2: Thermal test P
Test cells and lithium polymer battery are to be stored for at least six hours at a test temperature equal to -72±5℃, followed by storage for at least six hours at a test temperature equal to -40±2℃. The maximum time interval between test temperature extremes is 30 minutes. This procedure is to be repeated 10 times, after which all test cells and batteries are to be stored for 24 hours at ambient temperature. P
Cells and lithium polymer battery meet this requirement if there is no mass loss, no leakage, no venting, no disassembly, no rupture and no fire and if the open circuit voltage of each test cell or battery after testing is not less than 90% of its voltage immediately prior to this procedure. The requirement relating to voltage is not applicable to test cells and batteries at fully discharged states. No leakage, no venting, no disassembly, no rupture and no fire. P

T.3.: Vibration

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Clause Requirement + Test Result Verdict
38.3.4.3 Test T.3.: Vibration P
Test cells and lithium polymer battery are firmly secured to the platform of the vibration machine without distorting the cells in such a manner as to faithfully transmit the vibration. The vibration shall be a sinusoidal waveform with a logarithmic sweep between 7 Hz and 200 Hz and back to 7 Hz traversed in 15 minutes. This cycle shall be repeated 12 times for a total of 3 hours for each of three mutually perpendicular mounting positions of the cell. One of the directions of vibration must be perpendicular to the terminal face. P
The logarithmic frequency sweep shall differ for cells and batteries with a gross mass of not more than 12 kg(cells and small lithium polymer battery), and for batteries with a gross mass of more than 12 kg(large batteries). P
For cels and small batteries: from 7 Hz a peak acceleration of 1 gn is maintained until 18 Hz is reached. The amplitude is then maintained at 0.8mm (1.6mm total excursion) and the frequency increased until a peak acceleration of 8 gn occurs( approximately 50Hz). A peak acceleration of 8 gn is then maintained until the frequency is increased to 200Hz. P
Cells and lithium polymer battery meet this requirement if there is no mass loss, no leakage, no venting, no disassembly, no rupture and no fire and if the open circuit voltage of each test cell or battery after testing is not less than 90% of its voltage immediately prior to this procedure. The requirement relating to voltage is not applicable to test cells and batteries at fully discharged states. No leakage, no venting, no disassembly, no rupture and no fire. P

T.4: Shock

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Clause Requirement + Test Result Verdict
38.3.4.3 Test T.3.: Vibration P
Test cells and lithium polymer battery are firmly secured to the platform of the vibration machine without distorting the cells in such a manner as to faithfully transmit the vibration. The vibration shall be a sinusoidal waveform with a logarithmic sweep between 7 Hz and 200 Hz and back to 7 Hz traversed in 15 minutes. This cycle shall be repeated 12 times for a total of 3 hours for each of three mutually perpendicular mounting positions of the cell. One of the directions of vibration must be perpendicular to the terminal face. P
The logarithmic frequency sweep shall differ for cells and batteries with a gross mass of not more than 12 kg(cells and small batteries), and for batteries with a gross mass of more than 12 kg(large batteries). P
For cels and small lithium battery: from 7 Hz a peak acceleration of 1 gn is maintained until 18 Hz is reached. The amplitude is then maintained at 0.8mm (1.6mm total excursion) and the frequency increased until a peak acceleration of 8 gn occurs( approximately 50Hz). A peak acceleration of 8 gn is then maintained until the frequency is increased to 200Hz. P
Cells and lithium polymer battery meet this requirement if there is no mass loss, no leakage, no venting, no disassembly, no rupture and no fire and if the open circuit voltage of each test cell or battery after testing is not less than 90% of its voltage immediately prior to this procedure. The requirement relating to voltage is not applicable to test cells and batteries at fully discharged states. No leakage, no venting, no disassembly, no rupture and no fire. P

T.5: External short circuit

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Clause Requirement + Test Result Verdict
38.3.4.5 Test T.5: External short circuit P
The cell or lithium polymer battery to be tested shall be temperature stabilized so that its external case temperature reached 57±4℃ and then the cell or battery shall be subjected to a short circuit condition with a total external resistance of less than 0.1 ohm at 57±4℃. This short circuit condition is continued for at least one hour after the cell or battery external case temperature has returned to 57±4℃. P
Cells and lithium polymer battery meet this requirement if their external temperature does not exceed 170℃ and there is no disassembly, no rupture and no fire during the test and within six hours after the test. P

T.6.: Impact/ Crush

ClauseRequirement + TestResultVerdict
38.3.4.6Test T.6: Impact/ CrushP
Test Procedure- Crush( applicable to prismatic, punch, coin/button cells and cylindrical cells not more than 18mm in diameter).P
A cell or component cell is to be crushed between two flat surfaces. The crushing is to be gradual with a speed of approximately 1.5cm/s at the first point of contact. The crushing is to be continued until the first of the three options below is reached.
(a) he applied force reaches 13 kN±0.78 kN;
P
A prismatic or punch cell shall be crushed by applying the force to the widest side. A button/coin cell shall be crushed by applying the force on its flat surfaces. For cylindrical cells, the crush force shall be applied perpendicular to the longitudinal axis.P
Each test cell or component cell is to be subjected to one curse only. The test sample shall be observed for a further 6 h. The test shall be conducted using test cells or component cells that have not previously been subjected to other tests.P
Cells and component cells meet this requirement if their external temperature does not exceed 170℃ and there is no disassembly, no rupture and no fire during the test and within six hours after the test.No disassembly, no fire.P

T.7.: Overcharge

ClauseRequirement + TestResultVerdict
38.3.4.7Test T.7: OverchargeP
The charge current shall be twice the manufacturer’s recommended maximum continuous charge current. Tests are to be conducted at ambient temperature. The duration of the test shall be 24 hours. The minimum voltage of the test shall be as follows:P
When the manufacturer’s recommended charge voltage is not more than 18v, the minimum voltage of the test shall be the lesser of two times the maximum charge voltage go the battery or 22v.The voltage of the test is 8.5V, and the current is 0.45A.P
There is no disassembly and no fire during the test and within seven days after the test.No disassembly, no fire.P

T.8.: Forced discharge

ClauseRequirement + TestResultVerdict
38.3.4.8Test T.8: Forced dischargeP
Each lithium polymer cell shall be forced discharge at ambient temperature by connecting it in series with a 12v D.C. power supply at an initial current equal to the maximum discharge current specified by the manufacturer.
The specified discharge current is to be obtained by connecting a resistive load of the appropriate size and rating in series with the test cell. Each cell shall be forced discharged for a time interval (in hours) equal to its related capacity divided by the initial test current) in ampere).
P
There is no disassembly and no fire during the test and within seven days after the test.No disassembly, no fire.P

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