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项目名称
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章节号
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测试方法
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Discharge performance at 20 °C
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4.2.1
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The cell shall have been charged in accordance with 4.1. After charging, the cell shall be stored, in an ambient temperature of 20 °C ± 5 °C, for not less than 1 h and not more than 4 h. It shall then be discharged in the same ambient temperature and as specified in Table 3.
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Discharge performance at +5 °C
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4.2.2
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The cell shall have been charged in accordance with 4.1. After charging, the cell shall be stored, in an ambient temperature of +5 °C ± 2 °C, for 24 h. Means must be provided to ensure that the electrolyte temperature has reached +5 °C ± 2 °C within 24 h. It shall then be discharged in the same ambient temperature and as specified in Table 4.
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Discharge performance at –18 °C
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4.2.3
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The cell shall have been charged in accordance with 4.1. After charging, the cell shall be stored, in an ambient temperature of –18 °C ± 2 °C, for 24 h. Means must be provided to ensure that the electrolyte temperature has reached –18 °C ± 2 °C within 24 h. It shall then be discharged in the same ambient temperature and as specified in Table 5.
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High rate current test
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4.2.4
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The cell shall have been charged in accordance with 4.1. After charging, the cell shall be stored, in an ambient temperature of 20 °C ± 5 °C, for not less than 1 h and not more than 4 h. It shall then be discharged for 5 s in the same ambient temperature and at the currents as given in Table 6. During the discharge the terminal voltage shall be recorded.
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Charge retention
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4.3
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The charge retention characteristics shall be verified by the following test:
After charging in accordance with 4.1, the cell shall be stored on open circuit for 28 days. The average ambient temperature shall be 20 °C ± 2 °C. The temperature may be allowed to vary within the range of 20 °C ± 5 °C for short periods during the storage. The cell shall then be discharged under the conditions specified in 4.2.1 at a rate of 0,2 It A. The duration of the discharge shall be not less than 3 h 15 min.
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Endurance in cycles
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4.4.1
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4.4.1.2 Cycles 1 to 49 The cycling shall be carried out under the conditions specified in Table 7. Charge and discharge shall be carried out at constant current throughout. Cycling shall be continuous, except that it is permissible to allow the cell to stand for a short period at the end of discharge of each 49th and 50th cycle in order to start the next 50-cycle sequence at a convenient time.
4.4.1.3 Cycle 50 The cell shall be charged in accordance with 4.1 and the capacity test shall be carried out as specified in 4.2.1 and at a discharge rate of 0,2 It A.
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Permanent charge endurance
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4.4.2
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The cell shall have been prepared in accordance with 4.1.
This shall be immediately followed by charging the cell at 0,02 It A for a period of 91 days. The cell shall then be discharged at 0,2 It A as specified in 4.2.1. This cycle shall be repeated three times. A short delay between cycles should be allowed in order to start a new cycle at a convenient time.
Precautions shall be taken to prevent the cell case temperature from rising above 30 °C during the test, e.g. by spacing the cells or providing a forced air draught if necessary. The duration of discharge obtained after the completion of four subsequent cycles as defined above shall be not less than 4 h 15 min. Leakage of liquid electrolyte shall not occur during this test.
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Charge acceptance at constant voltage
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4.5
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Overcharge
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4.6
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The cell shall have been prepared in accordance with 4.1.
This shall be immediately followed by charging the cell at a constant current of 0,03 It A, for 28 days, in an ambient temperature of 20 °C ± 5 °C. Precautions shall be taken to prevent the cell case temperature from rising above 30 °C during the test, e.g. by spacing the cells or providing a forced air draught if necessary. After this charging operation, the cell shall be stored in an ambient temperature of 20 °C ± 5 °C for not less than 1 h and not more than 4 h. The cell shall then be discharged in an ambient temperature of 20 °C ± 5 °C at a constant current of 0,2 It A to a final voltage of 1,0 V.
The duration of discharge shall be not less than 4 h 15 min. Leakage of liquid electrolyte shall not occur during this test.
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Safety device operation
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4.7
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Where a cell is fitted with a safety device, the following test shall be carried out in order to establish if it will allow the escape of gas when the internal pressure exceeds a critical value. i.e. that pressure at which the safety device must operate. The cell shall undergo a forced discharge in an ambient temperature of 20 °C ± 5 °C, at a constant current of 0,2 It A to a final voltage of 0,0 V.
The current shall then be increased to 1 It A and the forced discharge continued in the same ambient temperature of 20 °C ± 5 °C for 30 min. During and at the end of this discharge the cell shall not disrupt or burst. Leakage of electrolyte and deformation of the cell are acceptable.
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Gas leakage test
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4.8
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a constant current of 0,02 It A. During this charge the charge voltage shall be measured at intervals of 30 min. When the voltage is stabilised the cell shall be immersed in insulating oil and the charging continued for 1 h. Then the possible emergence of gas bubbles shall be observed for another hour with the cell still being charged.
No gas bubble shall be observed during this 1 h period.
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Storage
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4.9
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The cells shall be prepared for storage according to the manufacturer’s instructions. The cells shall then be stored on open circuit, in an average ambient temperature of 20 °C ± 5 °C and at a relative humidity of 65 % ± 20 %, for a period of 12 months. During the storage period the ambient temperature shall not at any time fluctuate beyond the limits of 20 °C ± 10 °C.
After completion of the storage period, the cells shall be prepared for use according to the manufacturer’s instructions. The cells are then subjected to the tests specified in 4.2.1 and shall meet all the requirements of that subclause.
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