Lithium Polymer Battery UL1642 Test Items

T.1 Short-Circuit Test;
T.2 Abnormal Charging Test;
T.3 Forced-Discharged Test
T.4 CrushTest;
T.5 ImpactTest;
T.6 Shock Test;
T.7 Vibration Test;
T.8 Heating Test;
T.9 Temperature Cycling Test;
T.10 Low Pressure (Altitude Simulation) Test;

Our company Liter energy battery Co. can help customers to apply the UL1642 test report. Each test takes one month after then you will get an officialUL1642 test report published by the third-party testing house (BCTC).

Lithium Polymer Battery UL1642 Performance

Lithium Polymer Battery UL1642 Test Samples

6.1 Fully charged primary cells or lithium polymer batteries and primary cells or batteries that have been conditioned by partial or complete discharge, or both, are to be used for the tests described in Sections 10-20. The number of samples to be used in each test for a primary technician-replaceable cell or lithium polymer battery is shown in Table 6.1. The number of samples to be used in each test for a primary user-replaceable cell or lithium polymer battery is shown in Table 6.3. When a group of cells or lithium polymer batteries of different sizes, but similar chemistries are involved, selected sizes representative of the range is to be tested.

6.2 Fully charged secondary cells or lithium polymer batteries and secondary cells or batteries that have been conditioned by charge-discharge cycling are to be used for the tests described in Sections 10 — 20. The number of samples to be used in each test for a secondary technician-replaceable cell or lithium polymer battery is shown in Table 6.2. The number of samples to be used in each test for a secondary user-replaceable cell or battery is shown in Table 6.4. When a group of cells or lithium polymer batteries of different sizes, and similar chemistries is involved, selected sizes representative of the range is to be tested.

6.3 Prior to conducting the testing in Section 17, the lithium polymer cell samples shall be pre-conditioned as outlined in 6.4 and 6.5.

6.4 For the heating test of Section 17, two sets of five lithium polymer batteries samples are to be fully discharged (i.e. to the manufacturer’s specified endpoint voltage). The samples are then placed in a test chamber and conditioned for 1 to 4 h (5 samples at the upper-temperature limit and 5 samples at the lower temperature limit of the operating region) as outlined in Table 6.3.

6.5 While still in the test chamber set at the temperature limits, the samples are charged (5 samples at the upper-temperature limit and 5 samples at lower temperature limit) at the specified maximum charging current and upper limit charging voltage per Table 6.3, using a constant voltage charging method. Charging is continued until the charge current is reduced to the specified end of charge conditions (i.e. 0.05 times the charge current).

Discharge Conditioning of Samples

7.1 Primary lithium polymer batteries are to be completely discharged by connecting their terminals through resistors that provide the desired level of discharge within 60 days. Completely discharged is considered to be the state in which the closed-circuit voltage has been reduced to less than 0.2 volts and the short-circuit current to less than 1.0 milliamperes. Lithium polymer batteries are to be discharged at room temperature. Cells with a liquid cathode such as thionyl chloride or sulfur dioxide shall also be conditioned by one-half discharge.

7.2 For solid electrolytes and other types of primary lithium polymer batteries that cannot be discharged within 60 days because of the small currents they inherently produce, longer discharge times plus discharge at higher temperatures may be used to obtain the desired level of discharge. The manufacturer’s recommended discharge procedures are to be followed so as to obtain the required discharge level in the minimum time.

7.3 Secondary cells are to be conditioned at 25°C (77°F). Cells are continuously cycled as per the manufacturer’s specifications. The specification shall be such that the full rated capacity of the cell is utilized and the number of cycles accumulated shall be at least equal to 25 percent of the advertised cycle life of the cell or cycled continuously for 90 days, whichever is shorter. Cycling is to be done either individually or in groups. Cells are to be recharged prior to testing as indicated in Table 6.2 and Table 6.4.

Important test considerations

8.1 Some lithium polymer batteries are capable of exploding when the tests described in Sections 10-20 are conducted. It is important that personnel be protected from the flying fragments, explosive force, sudden release of heat, and noise that results from such explosions. The test area is to be well ventilated to protect personnel from possible harmful fumes or gases.

8.2 As an additional precaution, the temperatures on the surface of the lithium polymer battery casings shall be monitored during the tests described in Sections 10, 12, 13, and 14. All personnel involved in the testing of lithium polymer batteries are to be instructed never to approach a lithium polymer battery while the surface temperature exceeds 90°C (194°F).

8.3 For protection, the Projectile Test, Section 20 is to be conducted in a room separate from the observer.

Temperature measurements

9.1 Temperatures are to be measured by thermocouples consisting of wires not larger than 24 AWG (0.21 mm2) and not smaller than 30 AWG (0.05 mm2) and a potentiometer-type instrument.

9.2 The temperature measurements on the batteries are to be made with the measuring junction of the thermocouple held tightly against the metal casing of the lithium polymer battery.

Lithium Polymer Battery UL1642 Electrical Tests

Short-Circuit Test

10.1 Each test sample lithium polymer battery, in turn, is to be short-circuited by connecting the positive and negative terminals of the lithium polymer battery with a circuit load having a maximum resistance load of 0.1 ohms. The battery is to discharge until a fire or explosion is obtained, or until it has reached a completely discharged state of fewer than 0.1 volts and the battery case temperature has returned to ±10°C (±18°F) of ambient temperature.

10.2 Tests are to be conducted at 20 ±5°C (68 ±9°F) and at 55 ±5°C (131 ±9°F). The lithium polymer batteries are to reach equilibrium at 20 ±5°C or 55 ±5°C, as applicable before the terminals are connected.

10.3 A lithium polymer battery is to be tested individually unless the manufacturer indicates that it is intended for use in series or parallel. For series or parallel use, additional tests on five sets of batteries are to be conducted using the maximum number of lithium polymer batteries to be covered for each configuration.

10.4 When an overcurrent or thermal protective device that has been investigated for the purpose actuates during the test, the test shall be repeated with the lithium polymer battery supply connected to the maximum load that does not cause the protective device to open. A protective device that has not been investigated for the purpose shall be short-circuited.

10.5 The samples shall not explode or catch fire. The temperature of the exterior cell or battery casing shall not exceed 150°C (302°F).

Abnormal Charging Test

11.1 Primary lithium polymer cells or lithium polymer batteries shall comply with 11.2— 11.7.

11.2 Cells or lithium polymer batteries conditioned in accordance with Tables 6.1 or 6.3, as applicable, are to be used for this test. The lithium polymer batteries are to be tested in an ambient temperature of 20 ±5°C (68 ±9°F).

11.3 Each test sample lithium polymer battery is to be subjected to a charging current of three times the current “l”, specified by the manufacturer by connecting it in opposition to a DC-POWER supply. The specified charging current is to be obtained by connecting a resistor of the specified size and rating in series with the lithium polymer battery. The best charging time is to be calculated using the formula:
t