T.1 height simulation test

Store the battery and battery at a temperature of 20±5°C and an atmospheric pressure of not more than 11.6kpa for at least 6 hours.

The open circuit voltage after the sample test shall not be lower than 90% of the open circuit voltage before the test. This requirement does not apply to the fully discharged battery and battery.

The sample (battery) should be free of liquid leakage, no venting, no disintegration, no cracking, and no ignition.

T.2 thermal shock

The battery storage conditions are as follows:

One temperature cycle is 72±2°C (6h) — -40±2°C (6h)

The maximum temperature conversion interval is 30min

Repeat 10 cycles

At the end of the cycle, the battery is allowed to stand for 24 hours at 20 ± 5 °C.

The open circuit voltage after the sample test shall not be lower than 90% of the open circuit voltage before the test. This requirement does not apply to the fully discharged battery and battery.

The sample (battery) should be free of liquid leakage, no venting, no disintegration, no cracking, and no ignition.

T.3 vibration test

The battery cell and battery are firmly mounted on the table of the vibration table

The vibration is in the form of a sine wave, increasing from 7 Hz to 200 Hz, then decreasing back to 7 Hz for one cycle, and one cycle lasting 15 minutes for logarithmic forward transfer.

The logarithmic sweep is: keep the maximum acceleration of 1gn from 7 Hz until the frequency is 18 Hz, then keep the amplitude at 0.8 mm (total offset 1.6 mm) and increase the frequency until the maximum acceleration reaches 8gn (frequency is about 50 Hz) , keep the maximum acceleration at 8gn until the frequency increases to 200 Hz.

One of the directions of vibration must be the vertical sample polarity, and each cell is cycled 12 times from three mutually perpendicular directions, 3 hours in each direction for 9 hours.

The open circuit voltage after the sample test shall not be lower than 90% of the open circuit voltage before the test. This requirement does not apply to the fully discharged battery and battery. The sample (battery) should be free of liquid leakage, no venting, no disintegration, no cracking, and no ignition.

T.4 impact test

Secure the entire fitting surface of each cell and battery sample with a stable bracket.

For each cell or battery with a half-sinusoidal acceleration with a peak of 150gn, the pulse lasts for 6 milliseconds. Large batteries and large battery packs must withstand a half-sine wave shock with a maximum acceleration of 50gn and a pulse duration of 11ms.

Each cell or battery pack was subjected to three impacts in the positive direction of three mutually perpendicular battery mounting orientations, followed by three impacts in the reverse direction, for a total of 18 impacts.

The open circuit voltage after the sample test shall not be lower than 90% of the open circuit voltage before the test. This requirement does not apply to the fully discharged battery and battery. The sample (battery) should be free of liquid leakage, no venting, no disintegration, no cracking, and no ignition.

T.5 external short circuit test

Keep the test environment temperature at 57±4°C, so that the external temperature of the battery or battery sample reaches 57±4°C.

The positive and negative samples were short-circuited with a total resistance loop of less than 0.1 Ω, and the external temperature of the sample returned to 57 ± 4 ° C and remained short-circuited for more than 1 hour.

The cell or battery must be observed for a further 6 hours to reach a conclusion.

Cell or battery sample during and after 6 hours of testing

- The external temperature does not exceed 170 ° C

- No disintegration, no cracking and no fire.

T.6 impact test

Impact (for cylindrical batteries with a diameter of not less than 18 mm)

Place the cell or polymer cell for the test sample on a flat, smooth surface

After a crossbar of 15.8 mm in diameter was placed across the middle of the cell, an object of mass 9.1 kg was dropped from the height of 61 ± 2.5 cm toward the sample.

For specimens subjected to impact, the longitudinal axis shall be parallel to the flat surface and perpendicular to the longitudinal axis of the curved surface 15.8 ± 0.1 mm across the center of the specimen. Each sample was subjected to only one impact.

The maximum surface temperature of the cell or battery should not exceed 170 °C within 6 hours after the end of the test, the cell and polymer cell should be free from disintegration and no ignition.

T.6 extrusion test

Extrusion (for prismatic, pocket, coin/button batteries and cylindrical batteries less than 18 mm in diameter)

The battery or component battery is squeezed between two planes, and the pressing force is gradually increased, and the speed at the first contact point is about 1.5 cm/sec. Squeeze continues until one of three things happens:

- The applied force reaches 13 KN ± 0.78 KN

- The battery voltage drops by at least 100 millivolts

- The battery is deformed to more than 50% of the original thickness.

Prismatic or pouched batteries should be pressed from the widest side. Button/coin-shaped batteries should be pressed from their flat surfaces. The cylindrical shape should be pressed from a direction perpendicular to the longitudinal axis.

The maximum surface temperature of the cell or battery should not exceed 170 °C within 6 hours after the end of the test, the cell and polymer cell should be free from disintegration and no ignition.

T.7 overcharge test

Charge the sample with 2 times the manufacturer's recommended maximum continuous charging current

The minimum voltage for this test is:

If the manufacturer's recommended charging voltage does not exceed 18V, the minimum charging voltage for this test should be twice the manufacturer's rated maximum charging voltage or the smaller of 22V.

If the recommended charging voltage exceeds 18V, the minimum charging voltage for this test shall be 1.2 times the maximum rated charging voltage of the manufacturer.

The test lasts for 24 hours at an ambient temperature of 20 ± 5 °C. The test sample shall be free from disintegration and non-ignition during the test and within 7 days after the test.

T.8 forced discharge test

At a temperature of 20 ± 5 ° C, a single cell is connected to a 12 V DC power source for forced discharge. This DC power supply provides the initial current for each cell to the maximum discharge current specified by the manufacturer.

The specified discharge current is obtained by a load of suitable size and power connected in series on the test cell, and the forced discharge time (hours) of each cell is the rated capacity divided by the initial current (amperes). The test sample shall be free from disintegration and non-ignition during the test and within 7 days after the test.

1.2m drop (after packaging)

The packaged lithium battery was dropped from 1200mm (the lowest point of the battery) to 18-20mm thick hardwood board at 20±5°C (the board was laid on the concrete floor). The test sample does not ignite during the test and after the test and does not explode.

Judging test eligibility criteria

(1) In tests T.1 to T.6, no disintegration or fire occurred.

(2) In tests T.1, T.2 and T.5, the effluent is not a toxic, flammable or corrosive substance.

a. No visual observation of exhaust or leakage;

b. No exhaust or leakage resulting in weight loss exceeding those shown in Table 38.3.4.7.1.

(3) In tests T.3 and T.6, the effluent is not a toxic or corrosive substance.

a. No visual observation of exhaust or leakage;

b. No exhaust or leakage resulting in weight loss exceeding those shown in Table 38.3.4.7.1.

(4) The 1.2m drop is from the positive and negative directions of X, Y and Z, and it is dropped once in each direction without leakage, no disintegration, no burning, no explosion, no damage.