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试验项目
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章节号
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标准要求
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External short circuit test (cell or cell block)
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8.2.1
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Fully charged cells are stored in an ambient temperature of 25 °C ± 5 °C. Each cell is then short circuited by connecting the positive and negative terminals with a total external resistance of 30 +/-10 mΩ.
The cells are to remain on test for 6 h or until the case temperature declines by 20 % of the maximum temperature rise, whichever is the sooner
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Impact test (cell or cell block)
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8.2.2
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The test sample is to be placed on a flat surface. A 15,8 mm diameter bar is to be placed across the centre of the sample. A 9,1 kg mass is to be dropped from a height of 61 ± 2,5 cm onto the bar placed on the sample.
A cylindrical or prismatic cell is to be impacted with its longitudinal axis parallel to the flat surface and perpendicular to the longitudinal axis of the 15,8 mm diameter curved surface lying across the centre of the test sample. A prismatic cell is also to be rotated 90 degrees around its longitudinal axis so that both the wide and narrow sides will be subjected to the impact. Each sample is to be subjected to only a single impact with separate samples to be used for each impact. (see figure 2)
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Drop test (cell or cell block, and battery system)
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8.2.3
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The drop test is conducted on a cell or cell block, and battery system*. The test method and the height of the drop are determined by the test unit weight as shown in the table 2.
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Whole drop test (cell or cell block, and battery system)
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8.2.3.1
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Each fully charged test unit is dropped three times from a height shown in table 2 onto a concrete floor.
In the case of the mass of test unit is less than 7kg, the test units are dropped so as to obtain impacts in random orientations. In the case of the mass of test unit is 7kg or more and less than 20 kg, the test shall be performed with the test unit dropped in the bottom down direction. The bottom surface of the test unit is specified by the manufacturer.
After the test, the test units shall be put on rest for a minimum of one hour and then 434 a visual inspection shall be performed.
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Edge and corner drop test (cell or cell block, and battery system)
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8.2.3.2
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Each fully charged test unit is dropped two times from a height shown in table 2 onto a concrete floor. The drop test conditions shall assure, with test arrangements as shown in Figure 3, Figure 4 and Figure 5 5, reproducible impact points for the shortest edge drop impact and the corner impacted. The two impacts, per impact type, shall be on the same corner and on the same shortest edge. For the corner and edge drops, the test unit shall be oriented in such a way that a straight line drawn through the struck corner/edge and the test unit geometric centre is approximately perpendicular to the impact surface.
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Thermal abuse test (cell or cell block)
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8.2.4
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Each fully charged cell, stabilized at room temperature, is placed in a gravity or circulating air convection oven.
The oven temperature is raised at a rate of 5°C / min ± 2 °C /min to a temperature of 85 °C ± 5 °C. The cell remains at this temperature for 3h before the test is discontinued.
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Overcharge test (cell or cell block)
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8.2.5
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The test shall be carried out at an ambient temperature of 25 °C ± 5 °C. Each test cell shall be discharged at a constant current of 0,2 It A to a final discharge voltage specified by the manufacturer. Sample cells shall then be charged with a constant current equal to the maximum specified charge current of the battery system until the voltage reaches the maximum voltage value that is possible when any single failure on the charge control or charge protection function occurs. Then, the charge is terminated. The voltage and temperature should be monitored during the test.
The test shall be continued until the temperature of the cell surface reaches steady state conditions (less than 10 °C change in a 30-minute period) or returns to ambient.
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Forced discharge test (cell or cell block)
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8.2.6
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A discharged cell is subjected to a forced discharge at 1,0 It A for a test period of 90min. After the test period, a visual inspection shall be performed.
If the discharge voltage reaches the target voltage shown below within the test period, the voltage shall be kept at the target voltage by reducing the current for the remaining test period. The target voltage is determined as follows:
i. Battery system provided with redundant independent protection for discharge voltage control or the battery system has only single cell or cell block:
Target voltage = - (upper limit charge voltage of the cell)
ii. Battery system provided with only a single protection or less for discharge voltage control:
Target voltage = - [upper limit charge voltage of the cell × (n-1)].
n; the number of cells connected in series in the battery system.
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