| Customization: | Available |
|---|---|
| Type: | Ni-CD Battery |
| Usage: | Electric Power, Boat |
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Vented cell (wet cell, flooded cell) NiCd batteries are used when large capacities and high discharge rates are required. Traditional NiCd batteries are of the sealed type, which means that charge gas is normally recombined and they release no gas unless severely overcharged or a fault develops. Unlike typical NiCd cells, which are sealed, vented cells have a vent or low pressure release valve that releases any generated oxygen and hydrogen gases when overcharged or discharged rapidly. Since the battery is not a pressure vessel, it is safer, weighs less, and has a simpler and more economical structure. This also means the battery is not normally damaged by excessive rates of overcharge, discharge or even negative charge.
They are used in aviation, rail and mass transit, backup power for telecoms, engine starting for backup turbines etc. Using vented cell NiCd batteries results in reduction in size, weight and maintenance requirements over other types of batteries. Vented cell NiCd batteries have long lives (up to 20 years or more, depending on type) and operate at extreme temperatures (from −40 to 70 °C).
A steel battery box contains the cells connected in series to gain the desired voltage (1.2 V per cell nominal). Cells are usually made of a light and durable polyamide (nylon), with multiple nickel-cadmium plates welded together for each electrode inside. A separator or liner made of silicone rubber acts as an insulator and a gas barrier between the electrodes. Cells are flooded with an electrolyte of 30% aqueous solution of potassium hydroxide (KOH). The specific gravity of the electrolyte does not indicate if the battery is discharged or fully charged but changes mainly with evaporation of water. The top of the cell contains a space for excess electrolyte and a pressure release vent. Large nickel-plated copper studs and thick interconnecting links assure minimum equivalent series resistance for the battery.
Dimensions
Specifications
| Nominal Voltage | 1.2V | |
| Capacity(5HR,20ºC) | 770Ah | |
| Dimension | Length | 395mm |
| Width | 180mm | |
| Total Height | 560mm | |
| Approx. Weight(filled) | 54Kg | |
| Internal resistance (Fully charged, 20ºC) |
0.32*10-3 Ω | |
| Capacity affected by temperature (5HR) | 20ºC | ≥100% |
| -18ºC | ≥80% | |
| Self-discharge (20ºC) |
28 days | <20% |
| Nominal operating temperature | 20ºC±5ºC | |
| Operating temperature range | -20ºC~50ºC | |
| Float charging voltage(20ºC) | 1.48 ~1.50V | |
| Charging current | 154A | |
| Boost charge (20ºC) | 1.5-1.70V | |
| Terminal material | Nickel- Clad Steel | |
| F.V/TIME | 8h | 5h | 3h | 2h | 1h | 30min | 20min | 15min | 10min | 5min | 1min |
| 1.0V | 97 | 154 | 239 | 323 | 501 | 616 | 655 | 693 | 770 | 847 | 939 |
| 1.05V | 96 | 149 | 216 | 308 | 462 | 501 | 539 | 616 | 655 | 770 | 924 |
| 1.1V | 95 | 146 | 208 | 270 | 354 | 424 | 462 | 501 | 539 | 616 | 809 |
| 1.14V | 91 | 139 | 193 | 216 | 293 | 347 | 385 | 424 | 462 | 501 | 655 |
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