EN IEC 62281:2019 pdf free download

EN IEC 62281:2019 pdf free download
EN IEC 62281:2019 pdf free download.Safety of primary and secondary lithium cells and batteries during transport
6.4.5 Test T-5: External short-circuit
a) Purpose
This test simulates conditions resulting in an external short-circuit.
b) Test procedure
The test cell or battery shall be heated for a period of time necessary to reach a homogeneous stabilized temperature of 57 °C ± 4 °C, measured on the external case. This period of time depends on the size and design of the cell or battery and should be assessed and documented. If this assessment is not feasible, the exposure time shall be at least 6 h for small cells and small batteries, and 1 2 hours for large cells and large batteries. Then the cell or battery at 57 °C ± 4 °C shall be subjected to a short circuit 2 condition with a total external resistance of less than 0,1 Ω.
This short circuit condition is continued for at least one hour after the cell or battery external case temperature has returned to 57 °C ± 4 °C, or in the case of large multi-cell batteries, has decreased by half of the maximum temperature increase observed during the test and remains below that value.
The short circuit and cooling down phases shall be conducted at least at ambient temperature.
The test shall be conducted using the test samples previously subjected to the shock test.
c) Requirements
There shall be no excessive temperature rise, no rupture, no explosion and no fire during this test and within the 6 h of observation.
The test cell or component cell is placed on a flat smooth surface. A stainless-steel bar (type 31 6 or equivalent) with a diameter of 1 5,8 mm ± 0,1 mm and a length of at least 60 mm or of the longest dimension of the cell, whichever is greater, is placed across the centre of the test sample. A mass of 9,1 kg ± 0,1 kg is dropped from a height of 61 cm ± 2,5 cm at the intersection of the bar and the test sample in a controlled manner using a near frictionless, vertical sliding track or channel with minimal drag on the falling mass. The vertical track or channel used to guide the falling mass shall be oriented 90 degrees from the horizontal supporting surface.
The test sample is to be impacted with its longitudinal axis parallel to the flat surface and perpendicular to the longitudinal axis of the stainless-steel bar lying across the centre of the test sample (see Figure 1 ).