Lead-acid stationary cells and batteries
BS 6290-2:1999 pdf free.Lead-acid stationary cells and batteries 一 Part 2: Specification for the high-performance Plante positive type.
discharge taking out of a quantity of eleetneity from a cell by connecting It to an external circuit In such a way that the current flows through the cell in the reverse direction to that for charging
NOTE The quantity or elecincity taken out is usually itwasurid in ampere hours.
3.14 capacity quantity of electricity that can he taken from a cell (or battery) at a particular rate of discharge, under specified conditions of voltage and temperature N(YrE Cqacity Is u.uiahly nwastircd In wnpeiv hours,
3.15 rated capacity designation, by the manufacturer, of the capacity of
a cell (or battery) under specified conditions of discharge
4 Materials and components
4,1 Positive plates
Positive plates shall be of the Planté lamelle type and shall be made of chemical lead conforming to Table 1. Sampling and chemical analysis of the lead shall be in accordance with relevant parts of HS 3908.
NOTE Analysis (or impurities which are not covered by BS 3t14)8 should be by documented insinamental methods.
The thickness and mass of the Plates shall conform to Table 2.
4.2 Negative plates
Negative plates shall be of the open-grid type, pasted to sustain at least the capacity of the corresponding positIve plate, as given in Table 2. The width and length of the negative plates shall not be less than those of their corresponding positives. Intermediate negative plates shall have a capacity, at the (.‘j rate (see 6.1), at least 2() % greater than the rated capacity of their corresponding positives. The minimum thickness of the intermediate plates shall he as given in Table 2
Separators shall he nuide of a Inieroporous material. They shall be designed to cover the facing surfaces of all the plates aiid to overlap the edges of the positive l)late by no less than the climtnsions given in Table 2.
4.4 Group bar
Group bars shall be made of pure lead or lead alloy. Where more than one pillar/group bar assembly is used in the assembly of the plate section, electneal continuity between group bars of like polarity shall be achieved by tack welding.
The current density at the 1 mm discharge rate shall not exceed 1.5 AJnun2 in any part of a group bar.
4.5 Terminal pillars
Terminal pillars or pillar/group bar assemblies shall be cast in lead alloy. They shall have a smooth surface finish, free from porosity and other defects, shall be compatible with the electrochemical conditions within the cell, and shall be suitable for mechanical connect ions.
If pillars contain copper inserts, this shall be stated by the niamifacturer. If copper inserts are used, the covering of lead around the insert within the cell shall be at. least 3.5 mm thick.
NOTE hilars containing copper inserts are normally used In celLs designed for high-discharge duties.
The current density at the 1 mm discharge rate shall not exceed 2.5 A/mm2 for lead pillars or 15.0 A/mm2 for lead pillars with copper inserts.
The terminal pillars shall not cariy any part of the weight of either Plate group.
Containers shall be made of transparent material, e.g. styrene aerylonit rile.
The positive plates shall be hung from ledges moulded in the container. The negative plates shall be supported from the bottom of the container. The weight of each plate group shall be transmitted vertically on to a flat base.
The clearance between the sides of the container and (he positive plates, and between the bottom of the container and the positive plates, shall conform to Table 3.
4.7 Cell lids
Cell lids shall be sealed to the container, Terminal pillars shall be sealed where they pass through the lid
NOTE The scaling should be designed to prevent corrosion of the iilbr above the litt
Apart from the vent holes, the complete cell shall be sealed sufficiently to withstand an internal pressure of 1 961 Pa (200 mmll2O).
4.8 Vent plugs
Vent plugs shall allow no visible wetting of the cell lid when the cell is being overcharged at the 0.09Cj rate at 20°C ambient temperature.
4.9 End springs or packing pieces
End springs or packing pieces shall be provided lo hold the plate groups in position.
NOTE The end springs or packing pieces should be designed to bold the plate gnupa in position throughesil the anticipated life of the cell.
5 Cell design
The number of plates per cell and the maximum external dimensions of the container shall be as given in Table 4.
NOTE inforniattun on related ccli capacities lx given In annex C. Oiwratlorud n’coiiitiwndatloiis relating to perfonitance arc given In annex 1), lifonnatknt on recharge characteristics Is given iii annex E.
6.1.1 The rated capacity shall be stated by the manufacturer in tenus of a tlisrharge tulle of h, as detailed in BS EN 60896-1:1992, clause 6, i.e. C,, at a fully charged electrolyte density of 1 207 kg/rn3 at 2() (‘.
6.1.2 When tlw actual capacity of a cell is measured as a laboratory type test in accordance with IIS EN 60896-1:1992, clause 13, the cell shall achieve the rated value stated, C1.-3, on the first discharge.
6.1.3 When the actual capacity of a battery is measured a.s a site test in accordance with 13S EN 60896-1:1992, clause 13, the battery shall achieve the rated value stated, Cct, on the first (hscharge. No individual cell voltage shall be below 1.75 V after 2.5 Ii of discharge.
NOTE The voltage of irwtividtud cells of a battety may fail below 1MOV (subject to the requirement of 6.1.3). A ccli whose voltage fails below 1.75 V after 2.5 h of discharge during site Lesting of a baltety may be replaced and the test repealed.
6.1.4 If the capacity is also to be determined at the I h rate, the values shown in Table 5 shall be used. If ad(linonal tests for capacity are required at other discharge rates, the values of discharge current to the fitial voltages given in annex F shall be as stated by the manufacturer.
6.1.5 If the initial average temperature (see
115 EN 60896-1:1992, 13.2 and 13.3) is different from the reference temperature of 20°C, the measured capacity C shall be corrected in accordance with 8.2.
When tested in accordance with uS EN 60896-1:1992, clause 15, the endurance, in chargeldischarge cycles. shall he that stated by the manufacturer.
6.3 Constant-voltage float-charge operation When tested in accordance with [IS EN 60896-1:1992, clause 14, the cell or battery shall meet the requirements specified in [IS EN 60896-1:1992, 7.2.BS 6290-2 pdf download.Lead-acid stationary cells and batteries