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Squeeze test

Partial certification program

Extrusion test requirements

UN38.3 certification

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 13KN ± 0.78 KN
  - The battery voltage drops by at least 100 mV
  - 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.
Result: The maximum surface temperature of the cell or battery does not exceed 170 °C. Within 6 hours after the end of the test, the cell and the polymer cell should be free from disintegration and no ignition.

UL certification

The battery was tested at an ambient temperature of 20 ° C ± 5 ° C. The battery is crushed between the two planes. The squeezing force is provided by a hydraulic piston or similar force mechanism. The pressing plane is in continuous contact with the battery until the pressing force is 13KN ± 1KN. Once the maximum squeezing force is obtained, it is released.
The longitudinal axis of the cylindrical or prismatic battery is tested in parallel with the extrusion surface. The prismatic battery is rotated 90° about its longitudinal axis so that both its wide and narrow sides are squeezed. Each sample cell is squeezed in only one direction. A separate sample is used for each test. The button battery was subjected to a compression test in a plane parallel to the pressing surface.
Result: No fire, no explosion.

CQC certification

The battery was placed in two planes, pressed perpendicular to the direction of the plates, and a pressing force of 13.0 kN ± 0.78 kN was applied between the plates. Once the pressure reaches the maximum value, the extrusion test can be stopped and the battery cannot be externally short-circuited during the test.
When the cylindrical battery is squeezed, its longitudinal axis is parallel with the two plates. The square battery and the flexible packaging battery only perform the extrusion test on the wide surface of the battery, and the button battery uses the upper and lower sides of the battery in parallel with the two plates to perform the extrusion test. .
Result: No fire, no explosion.

CB certification

The battery is transferred and comminuted between two planes at ambient temperature. The crushing force was applied by a device applying a force of 13 kN ± 0.78 kN. Once the pressure reaches a maximum, the voltage drops to a third of the original voltage and the force is released.
The longitudinal axis of the cylindrical or prismatic battery is tested in parallel with the extrusion surface. The square battery only performs a squeeze test on the wide side of the battery. The button battery is subjected to a squeeze test by using the upper and lower sides of the battery in parallel with the two plates.
Result: No fire, no explosion.


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