GENERAL INFORMATION

Nickel-cadmium cells are irreplaceable in situations where the high reliability and long life are required, and also at the operation under severe climatic conditions, operation on the remote objects when the regular monitoring of the batteries is difficult or impossible.

The cell type selection is determined by the required discharge rates

  • cells of all types (KPL, KGL, KPM, KPH) provide the full delivery of the nominal capacity at 0,2 Cn discharge current during 5 hours to the cell voltage 1,0 V, if the discharge current is increasing, the output capacity will be decreasing;
  • the cells of KPL and KGL types are designed for the long discharge rate at the current to 0,5 Cn;
  • the cells of KPM types are designed for the medium discharge rates at the current to 1,0 Cn;
  • the cells of KPH types are designed for the high discharge rates at the current to 5,0 Cn, in the pulsed mode — at the current to15 Cn, , under the drop in voltage to 0,65 V on cell.

  • operation in transport vehicles — 10 years;
  • operation as a back-up power source at the stationary objects — 20 years.

Advantages of alkaline nickel-cadmium cells

  • lack of necessity of electrolyte replacement during the whole lifecycle;
  • high reliability — possibility of instantaneous failure is excepted;
  • maintainability after deep discharge, short circuits and long-term storage;
  • resistance to mechanical loadings and vibration under group M25;
  • wide range of working environment temperature (-40…+45°С);
  • ensure operation after a long being at temperature till -50°С;
  • translucent plastic cell box allows to conduct visual control of electrolyte level;
  • for non-maintenance cells of KGL type — lack of necessity of electrolyte level alignment upon observance of operating conditions.

Examples of cell designation

KPL300P, KPM300P, KPH300P, KGL300P
К — designation of nickel-cadmium electrochemical system;
L, M, H — cell designation according to the discharge rate;
L — cell of long discharge rate;
M — cell of medium discharge rate;
H — cell of high discharge rate;
G - non-maintenance cell with gas recombination;
300 — nominal capacity in Ah;
P — plastic box of cell (without «P» — a steel box of cell)
The figure in the front of cell designation means the number of cells in the battery, for example 4KPL300P.

Construction

Description of construction

1. Terminal
provides the current takeoff and cell connection.
2. Plug
provides convenient electrolyte filling, free gas outlet during charging, and excludes electrolyte plashing and its aerosol steams.
3. Electrode connection
connects the electrodes and provides the current transfer from electrodes to terminal.
4. Contact banks
are welded to electrode and provide the current takeoff from the electrodes.
5. Electrode
consists of horizontally located pocket plates, contains active material enclosed in steel perforated strip.
6. Rib
provide electrode rigidity and current transfer to the contact banks.
7. Separator
divides positive and negative electrodes, provides free circulation of electrolyte between the electrodes.

Electrolyte requirements

Electrolyte is a water solution of potassium hydroxide GOST 9285–78 of superior grade with density (1200±10) kg/m3 , (1,19 — 1,21 g/cm with addition of lithium hydroxide GOST 8595–83 in amounts of (20±1) g/l. At the electrolyte temperature less than — 30 оС use electrolyte with density 1,26 –1,28 g/cm3 without addition of lithium hydroxide.

General characteristics

  • batteries are supplied in the form of separate cells or battery blocks with compounds;
  • nominal voltage of cell is 1,2V, the block voltage depends on the number of the cells in the block (2,4 V; 3,6 V; 4,8 V; 6,0 V; 7,2 V; 8,4 V; 9,6 V; 10,8 V; 12,0 V);
  • cells and batteries provide full operation after storage during three months within the whole working temperature range without charge when putting into operation, under condition, that battery was charged and powered off before placing in storage;
  • cells and batteries ensure operation after six months storage, under condition, that battery was charged and powered off before placing in storage, battery should be charged before starting operation;
  • Criterion of cells limiting state is a lowering of available capacity to less than 60 % of nominal capacity;
  • after completion of operation JSC «Zavod AIT» accept cells for recycling together with electrolyte.