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Research, planning, design and engineering Accumulator Institute


Water-Activated Batteries

Fields of Application

  • Naval equipment
  • Power supply of equipment for oceanographic research
  • Power supply of energy installation of deep-water apparatus.

These batteries are activated by adding of sea water which is the electrolyte.


For today the batteries of bipolar and monopolar design have been developed and used. Monopolar cells are connected by wire or foil current terminals. Bipolar electrodes are connected by graphite and binder layer which is coated on magnesium anode or on the sewing part made of copper wire. The batteries of immersing, ampoule and flow types are produced. The case of immersing type battery has the holes and slits or has no bottom. When immersing the sea water comes from below or sideways and activates the battery. The batteries of ampoule type have the separators which have been firstly impregnated with sodium chloride solution and then dried. In the batteries of flow type the sea water is forcedly moved between electrodes. The special pump provides the water recirculation. Thanks to electrolyte circulation, temperature rise due to the heat evolution, and application of non-passivating anodes the high current densities (up to 5 /m2) and specific energy (up to 1,2 kWh/kg) are achieved.

Technical Advantages

  • Reliability
  • Long unactivated shelf life
  • Simplicity of activation