FIELD: electric batteries. SUBSTANCE: thermal control is conducted thanks to use of heat of phase transformation "melting-crystallization" of substance which is placed in space of battery and is kept in two-phase state during operational mode providing from relationship between masses of melted and crystallized phase within range of 10-15:1. Prior to storage or charging battery is enclosed in constant-temperature cabinet decreasing heat release to environment and providing for gradual crystallization of melt of substance in space of battery. Release of crystallization heat is used to prolong storage time of battery without additional. EFFECT: prolonged storage time of battery. 2 cl, 1 dwg
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