IEC 61951-2：2017《Secondary cells and batteries containing alkaline or other non-acid electrolytes － Portable sealed rechargeable single cells － Part 2Nickel-metal hydride》

项目名称

章节号

测试方法

Discharge performance for cells at 20 °C

7.3.2.2

The 0,2 It A discharge test is performed in order to verify the declared rated capacity of the
cell.

Discharge performance for batteries at 20 °C

7.3.2.3

The battery shall then be discharged, as specified in Table 8, in an ambient temperature of 20 °C ± 5 °C at a constant current of 0,2 It A until its voltage is equal to the number of series connected cells times 1,0 V, unless otherwise specified by the manufacturer.The 0,2 It A discharge test is performed in order to verify the declared rated capacityof the cell.

Rated capacity (mAh) compliance test (example)

7.3.2.4

Table 9 is an example showing compliance of a cell or battery test sample (sample size 32)when the manufacturer declares a rated capacity of 2 000 mAh.

Discharge performance at 0 °C

7.3.3

The cell shall be charged in accordance with 7.2. After charging, the cell shall be stored, in an ambient temperature of 0 °C ± 2 °C for not less than 16 h and not more than 24 h. The cell shall then be discharged in an ambient temperature of 0 °C ± 2 °C as specified in Tables 10 or Table 11. The duration of discharge shall not be less than the values specified in Tables 10 or Table 11.

Discharge performance for rapid charge cells (R cells)

7.3.4

Charge (capacity) retention

7.4

The charge (capacity) retention shall be determined by the following test. After charging in accordance with 7.2, the cell shall be stored on open circuit for a specified time. 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 be discharged under the conditions specified in 7.3.2 at a rate of 0,2 It A. The duration of discharge after 28 days storage at 20 °C shall not be less than:
• 3 h for small prismatic cells and cylindrical cells;
• 3 h 45 min for button cells.
For cells designated as low self-discharge type, defined in 5.1, the duration of discharge after 6 months storage at 20°C shall not be less than:

Endurance in cycles

7.5.1

 Prior to the endurance in cycles test, the cell shall be discharged at a constant currentof 0,2 It A to a final voltage of 1,0 V.The following endurance test shall then be carried out, irrespective of cell designation, in an ambient temperature of 20 °C ± 5 °C. Charge and discharge shall be carried out at constant current throughout, in accordance with the conditions specified in Tables 12, Table 13, Table 14 and Table 15. Precautions shall be taken to prevent the cell-case temperature from rising above 35 °C during the test, by providing a forced air draught if necessary.

Permanent charge endurance

7.5.2

7.5.2.2 L, M, H or X cylindrical cells

7.5.2.4 JT cylindrical cells

7.5.2.5 LU, MU or HU cylindrical cells

Charge acceptance at constant voltage

7.6

This document does not specify a charge acceptance test at constant voltage.
Charging at constant voltage is not recommended.

Overcharge

7.7

7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells

7.7.3 J cylindrical cells

7.7.5 R cylindrical cells

Safety device operation

7.8

The following test shall be carried out in order to establish that the safety device of the cell will operate to allow the escape of gas when the internal pressure exceeds a critical value.
NOTE Some button cells do not have a gas release vent. This test is not applicable on this type of cell.
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 1,0 It A and the forced discharge continued in the same ambient temperature of 20 °C ± 5 °C, for 60 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.

Surface temperature limitation device operation (for S cell only)

7.9

The following test shall be carried out in order to establish that the surface temperature limitation device will operate to prevent the cell temperature from excessively rising when the surface temperature limited cell is misused.

After charging in accordance with 7.2, the test shall be carried out as follows:
Test method: Four cells shall be connected in series but one of the four cells shall be placed in a reverse position. In this state, the terminals of the series string are connected by a wire to cause a short circuit. Short-circuit resistance: 80 mΩ +/- 20 mΩ. The test shall be terminated, when one of the following two cases occurs:
• 24 hours have elapsed or
• the cell-case temperature has been reduced by 20 % from the maximum temperature increase.
Then, verify the following:
• there was no cell explosion or fire;
• the cell temperature increase was less than 45 °C;
• no leakage shall be found by visual inspection.

Storage

7.10

7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical cells orbatteries

7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical cells or
batteries (high recovery type)

Charge acceptance at +55 °C for LT, MT or HT cylindrical cells

7.11

This test is not a requirement. It will be used as reference of performance and is applicableto LT, MT or HT cylindrical cells only.The cell shall 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 and stored in an ambient temperature of +55 °C ± 2 °C for not less than 16 h and not more than 24 h.

Trickle charge acceptance for JT cylindrical cells

7.13

The internal resistance of sealed nickel-metal hydride small prismatic or cylindrical rechargeable single cells shall be checked either by the alternating current (AC) or by the direct current (DC) method. Should the need arise for the internal resistance to be measured by both AC and DC methods
on the same cell, then the AC method shall be used first, followed by the DC method. In thiscase, it is not necessary to discharge and charge the cell between conducting AC and DC methods. Prior to the measurements, the cell shall be discharged at 0,2 It A to a final voltage of 1,0 V.The cell shall be charged in accordance with 7.2. 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.The measurementof internal resistance shall be carried out in an ambient temperature of 20 °C ± 5 °C.

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