Norms of acceptance tests. Rechargeable batteries

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Norms of acceptance tests. Rechargeable batteries

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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1.8.38. 1. Measurement of insulation resistance.

The measurement is made with a voltmeter (the internal resistance of the voltmeter must be precisely known, class not lower than 1).

With the load completely removed, the battery voltage at the terminals and between each of the terminals and ground should be measured.

Insulation resistance Rx is calculated by the formula

where Rq is the internal resistance of the voltmeter; U - voltage at the battery terminals; U1 and U2 are the voltage between positive terminal and ground and negative terminal and ground.

The insulation resistance of the battery must be at least the following:

Rated voltage, V	24	48	110	220
Resistance, kOhm	60	60	60	150

2. Checking the capacity of the molded battery.

Fully charged batteries are discharged with a 3- or 10-hour current.

The battery capacity, reduced to a temperature of +25 ºС, must correspond to the manufacturer's data.

3. Electrolyte check.

The density of the electrolyte of each cell at the end of the charge and discharge of the battery must comply with the manufacturer's data. The temperature of the electrolyte during charging should not exceed +40 ºС.

4. Chemical analysis of the electrolyte.

The electrolyte for filling acid batteries should be prepared from grade A sulfuric acid according to GOST 667-73 and distilled water according to GOST 6709-72.

The content of impurities and non-volatile residue in the diluted electrolyte should not exceed the values given in Table 1.8.37.

5. Measurement of voltage on the elements.

The voltage of the lagging cells at the end of the discharge should not differ by more than 1-1,5% from the average voltage of the remaining cells, and the number of lagging cells should not exceed 5% of their total number in the battery. The voltage value at the end of the discharge must correspond to the manufacturer's data.

Table 1.8.37. Standards for the characteristics of sulfuric acid and electrolyte for batteries*

Index	Standards for sulfuric acid	Norms for electrolyte
Index	Top grade	Diluted fresh acid for filling into batteries	Battery electrolyte
1. Appearance	Transparent	Transparent
2. Color intensity (determined by colorimetric method), ml	0,6	0,6	1
3. Density at a temperature of 20 ºС, g/cm³	1,83 - 1,84	1,18±0,005	1,2 - 1,21
4. Iron content, %, no more	0,005	0,006	0,008
5. The content of non-volatile residue after calcination,%, no more	0,02	0,03	-
6. The content of nitrogen oxides,%, no more	0,00003	0,00005	-
7. Arsenic content, %, no more	0,00005	0,00005	-
8. Content of chloride compounds, %, no more	0,0002	0,0003	0,0005
9. Content of manganese, %, no more	0,00005	0,00005	-
10. Copper content, %, no more	0,0005	0,0005	-
11. The content of substances that reduce potassium permanganate, ml of 0,01 N KMnO solution₄, no more	4,5	-	-
12. The content of the amount of heavy metals in terms of lead,%, no more	0,01	-	-

* For distilled water, the presence of the same impurities is allowed, which allows GOST 667-73 for battery acid, but 10 times lower concentration.

See other articles Section Rules for the installation of electrical installations (PUE).

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