High efficiency electrochemical power supply source for an underwater vehicle

An electrochemical-type power supply (3), for use in marine environment, comprising:

• an electrochemical stack (4), configured to generate electric power, in the presence, internally, of an electrolytic fluid,
• a first tank (6), configured to contain electrolytic fluid at a first temperature;
• a second tank (8), configured to contain electrolytic fluid at a second temperature, lower than the first temperature,
• a thermostatic valve (14), configured to mix electrolytic fluid at a lower temperature with electrolytic fluid at a higher temperature, for generating a mixed electrolytic fluid to be introduced into the electrochemical stack (4) at a controlled temperature for generating a desired electric power,
• said electrochemical power supply source (3) further comprising an auxiliary tank (20), configured to contain electrolytic fluid at a third temperature, higher than said first temperature;
• wherein said thermostatic valve (14) is configured to be connected to the auxiliary tank (20) and to receive, at an input, the electrolytic fluid at said third temperature, as said electrolytic fluid at a higher temperature, for generating the mixed electrolytic fluid, in a given operating condition.