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IEC 61951-2:2011《Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 2Nickel-metal hydride》

来源:吴江电池产品检测实验室 | 时间:2016-3-18 15:30:00 |  【字号:
 

7 Electrical tests

项目名称

章节号

测试方法

Discharge performance at 20 °C

7.3.2

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 cell shall then be discharged in an ambient temperature of 20 °C ± 5 °C and as specified in Tables 5 or 6. The duration of discharge shall be not less than the values specified in Tables 5 or 6.

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

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 and as specified in Tables 7 or 8. The duration of discharge shall be not less than the values specified in Tables 7 or 8.

Discharge performance for rapid charge cells (R cells)

7.3.4

R cells shall be charged at a constant current of 1,0 It A for 1,2 h or other appropriate charge termination method as recommended by the cell manufacturer, followed by a charge at 0,1 It A for 2 h, in an ambient temperature of 20 °C ± 5 °C. After charging, the cell shall be stored and discharged as specified in 7.3.2 and 7.3.3.

The duration of discharge shall be not less than the values specified in Table 5 for discharge at 20 °C ± 5 °C and in Table 7 for discharge at 0 °C ± 2 °C.

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 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 cells 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 be not less than:

3 h for small prismatic cells and cylindrical cells;

3 h 45 min for button cells.

Endurance in cycles

7.5.1

Prior to the endurance in cycles test, the cell shall be discharged at a constant current of 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 9, 10, 11 and 12.

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

Prior to this test, the cell shall be discharged at 0,2 It A to a final voltage of 1,0 V.

The following permanent charge endurance test shall be carried out in an ambient temperature of 20 °C ± 5 °C. Charge and discharge shall be carried out at constant current throughout, using the conditions specified in Table 13.

Overcharge

7.7

 

Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells

7.7.1

The ability of the cell to withstand an overcharge shall be determined by the following test.

Prior to this test, the cell shall be discharged in an ambient temperature of 20 °C ± 5 °C, at a constant current of 0,2 It A, down to a final voltage of 1,0 V. The cell shall then be charged, in an ambient temperature of 20 °C ± 5 °C, at a constant current of 0,1 It A for 48 h. 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 at 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 5 h.

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

7.7.2

performed at 0 °C ± 2 °C in circulating air. Prior to this test, the cell shall be discharged in an ambient temperature of 20 °C ± 5 °C at 0,2 It A to a final voltage of 1,0 V and stored, at 0 °C ± 2 °C, for not less than 16 h and not more than 24 h.

Charge and discharge shall be carried out at constant current, using the conditions specified in Table 16. The discharge condition A or B may be chosen to suit the user's requirements.

The duration of discharge shall be not less than that specified in Table 7.

R cylindrical cells

7.7.3

The ability of the cell to withstand an overcharge shall be determined by the following test.

Prior to this test, 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.

The cell shall be charged in an ambient temperature of 20 °C ± 5 °C at a constant current of 1,0 It A for 1,2 h or other appropriate charge termination such as -ΔV or as recommended by the manufacturer. Then charging should be continued in the same ambient temperature at a constant current of 0,1 It A for 48 h. 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 at 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 5 h.

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 safety vent. This test should not be performed 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 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

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: 100 mΩ or less.

The test shall be terminated, when one of the following two cases occurs first:

24 hours have elapsed or

the cell-case temperature has been reduced by 20 % from the maximum temperature increase.

Then, verify the followings:

the cell has not exploded and not taken fire;

the cell temperature increase is less than 45 °C;

no leakage shall be found by visual inspection.

Storage

7.10

Storage should be carried out according to the recommendations of the manufacturer.

Prior to this test, 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. It shall then be charged in accordance with:

7.2 for button cells, small prismatic cells, L, M, H, X, LS, MS, LT/LU, MT/MU or HT/HU cylindrical cells;

7.3.4 for R cylindrical cells.

The cell shall then be stored on open circuit, at a mean temperature of 20 °C ± 5 °C and a relative humidity of 65 % ± 20 % for 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 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 then charged

in accordance with:

7.2 for button cells, small prismatic cells, L, M, H, X, LS, MS, LT/LU, MT/MU or HT/HU cylindrical cells;

7.3.4 for R cylindrical cells.

The cell shall then be discharged at each rate of constant current appropriate to cell designation as specified in 7.3.2. Five cycles are permitted for this test. The test shall be terminated at the end of the first cycle which meets the requirement.

The minimum discharge duration for each rate of constant current shall be not less than 80 % of the values specified in Tables 5 or 6.

NOTE In the case of a quality acceptance procedure, provisional approval of cell performance may be agreed, pending satisfactory results on discharge after storage.

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

7.11

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.

The charge acceptance test shall then be carried out in an ambient temperature of +55 °C ± 2 °C. Charge and discharge shall be carried out at constant currents, using the conditions specified in Table 17. The discharge conditions A or B may be chosen to suit the users’ requirements.

Measurement of the internal a.c. resistance

7.12.2

The alternating r.m.s. voltage, Ua, shall be measured when applying to the cell an alternating r.m.s. current, Ia, at the frequency of 1,0 kHz ± 0,1 kHz for a period of 1 s to 5 s.

The internal a.c. resistance, Rac, is given by

Measurement of the internal d.c. resistance

7.12.3

The cell shall be discharged at a constant current of value I1 as specified in Table 18. At the end of a discharge period of 10 s, the voltage U1 during discharge shall be measured and recorded. The discharge current shall then be immediately increased to a constant value of I2 as specified in Table 18 and the corresponding voltage U2 during discharge shall be measured and recorded again at the end of a discharge period of 3 s.

All voltage measurements shall be made at the terminals of the cell independently of contacts used to carry current.

The internal d.c. resistance, Rdc, of the cell shall be calculated using the following formula

 

 

 

 

 

 

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