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3.17.8 Thermal Runaway Test
(1)At the ambient temperature of 25°C±2℃,charge the cell according to(3.8),and then
install the test clamp according to (3.3.1)
(2)Use a flat or rod-shaped heating device,and its surface should be covered with
ceramic,metal or insulating layer.The heating power of the heating device should be in the range of
600~1200 W.Complete the assembly of the cell and the heating device,the heating device should be
in direct contact with the cell,and the size of the heating device should not be larger than the heated
surface of the cell;Install a temperature monitor and the detection point temperature sensor is
arranged on the far side of the principle heat conduction.That is,on the opposite side of the heating
device.(see the picture below)The temperature data sampling interval should be shorter than 1 s,the
accuracy should be±2℃,and the diameter of the temperature sensor tip should be less than 1 mm.
(3)After the cell is fully charged,continue to charge for 12 minutes at a constant current of 1C.
(4)Start the heating device and continue to heat the test object with its maximum power.When
thermal runaway occurs or the temperature of the monitoring point reaches 300°C,stop heating and
turn off the heating device.
(5)Stop the test whenever fire of explosion occurs within or after the heating process for 1 h.
a)The test object generates a pressure drop;
b)The temperature of the monitoring point reaches the protection temperature of the cell;
c)Temperature rise rate of monitoring points ≥1℃/s.
When a)&c)or b)&c)occurs,it is determined that the cell is thermally out of control.(Refer to GB/T
36276-2018 Lithium ion battery for electrical energy storage)
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