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IEC 61427-2005《光伏能源系统(PVES)用二次单体电池和电池组——通用要求和测试方法 Secondary cells and batteries for photovoltaic energy systems (PVES) – General requirements and methods of test》

来源:吴江电池产品检测实验室 | 时间:2012-5-30 14:35:00 |  【字号:
 

IEC 61427-2005

Secondary cells and batteries for photovoltaic energy systems (PVES) – General requirements and methods of test

试验项目

章节号

标准要求

Capacity test

8.1

Test samples shall be set up in accordance with the applicable standards in 7.2. Tests to verify the rated capacity shall be performed using a current of I10 (A) for lead-acid batteries and It/5(A) for nickel-cadmium batteries according to the relevant clauses in the IEC standards listed in 7.2.

For the capacity test using a current of I120 (A) for lead-acid batteries or It/120 for nickel-cadmium batteries, the discharge shall be in accordance with parameters stated in Table 5 and the charging procedure shall be carried out according to the relevant clauses in the IEC standards listed in 7.2

Table 5 – Typical capacity ratings of batteries in photovoltaic applications

Capacity

Ah

Current

A

Discharge period

 h

Final voltage

V/cell

Lead-Acid

Nickel-Cadmium

Lead-Acid

Nickel-Cadmium

C120

I120

It/120

120

1.85

1.00

C120

I10

_

10

1.80

_

C5

_

It/5

5

_

1.00

NOTE For definitions, see Table 1.

 

 

Cycle endurance test in photovoltaic application (extreme conditions)

 

8.4

In photovoltaic applications the battery will be exposed to a large number of shallow cycles but at different states of charge. The cells or batteries shall therefore comply with the requirements of the test below, which is a simulation of the photovoltaic energy system operation.

The cycle endurance test is an accelerated simulation in extreme conditions of the battery operation in a photovoltaic energy system and shall be conducted by submitting the cells or monobloc batteries to a period of 150 cycles (50 cycles with the phase A and 100 cycles with the phase B).

Test samples shall be set up in accordance with the applicable standards listed in 7.2 after control of the capacity test in 8.1.

Start the test with the battery fully charged. Bring the battery to a temperature of 40 °C ± 3 °C and stabilize for 16 h. Maintain the battery at 40 °C ± 3 °C throughout the test.

8.4.1 Phase A: shallow cycling at low state of charge

l         Lead-acid batteries

a) Discharge the battery with a current I10 (A) during 9 h or until 1,75 V/cell is reached.

b) Recharge 3 h with a current 1,03 I10 (A)

c) Discharge 3 h with a current I10 (A).

l         Nickel-cadmium batteries

a) Discharge the battery with a current It /10 (A) during 9 h or until 1,00 V/cell is reached.

b) Recharge 3 h with a current 1,03 It /10 (A)

c) Discharge 3 h with a current It /10 (A)

For both battery types, repeat b) and c) 49 times. Recharge the battery to the fully charged condition according to the manufacturer recommendations and continue the phase B. Phase A is summed up in Table 6.

Table 6 – Phase A – Shallow cycling at low state of charge

 

Discharging time

h

Charging time

h

Lead-acid current

A

Nickel-cadmium current

A

a)

9

 

I10 (A)

(or stopping at 1,75 V/cell)

It /10 (A)

(or stopping at 1,00 V/cell)

b)

 

3

1,03 I10 (A)

1,03 It /10 (A)

c)

3

 

I10 (A)

It /10 (A)

Repeat b) to c) 49 times and continue to phase B

8.4.2 Phase B: shallow cycling at high state of charge

l         Lead-acid batteries

a) Discharge the battery for 2 h with a current 1,25 I10 (A)

b) Recharge 6 h with a current I10 (A). The charge voltage shall be limited to 2,40 V/cell, unless otherwise specified by the manufacturer.

l         Nickel-cadmium batteries

a) Discharge the battery for 2 h with a current 1,25 It /10 (A)

b) Recharge for 6 h with a current It /10 (A). The charge voltage shall be limited to 1,55 V/cell unless otherwise specified by the manufacturer.

For both batteries, repeat a) and b) 99 times and then perform a capacity determination according to 8.4.3. Phase B is summed up in Table 7.

Table 7 – Phase B – Shallow cycling at high state of charge

 

Discharging time

h

Charging time

h

Lead-acid current

A

Nickel-cadmium current

A

a)

2

 

1,25 I10 (A)

1,25 It /10 (A)

b)

 

6

I10 (A)

(charge voltage limited to

2,40 V/cell unless otherwise

specified by the manufacturer)

It /10 (A)

(charge voltage limited to

1,55 V/cell unless otherwise

specified by the manufacturer )

Repeat a) to b) 99 times

8.4.3 Capacity check

After the phase B, the battery is cooled down to the temperature defined in the relevant standard as described in 7.2 and stabilized at this value for 16 h. The capacity test (C10 for lead-acid batteries and C5 for nickel-cadmium batteries) is carried out according to the relevant standard as described in 7.2.

8.4.4 End of test condition

– Capacity is checked after each period of 150 cycles (phases A + B).

– The value of actual capacity determined in 8.4.3 shall be recorded.

The cycle life shall be expressed in number of 150 cycle (A+B) sequences completed.

– The test is finished:

l          During the phase A: when the cell voltage measured in discharge is lower than

1,5 V/cell for lead acid batteries and 0,8 V/cell for nickel-cadmium batteries.

l          After the phase B: when the checked capacity measured in 8.4.3 is lower than 80 % of the rated capacity.

8.4.5 Water consumption of flooded battery types and cells with partial gas

recombination

During the cycle endurance test, vented type cells or monoblocs may be topped up with water. The amount of water added shall be measured and reported.

8.4.6 Requirements

The number of complete cycle sequences (150 cycles) achieved at the end of the test shall be not less than the value stated by the manufacturer.

 

 

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