COOLING A BATTERY BY IMMERSION IN A COMPOSITION WITH A CHANGE IN STATE

1 . The use of a heat-transfer composition comprising from 20% to less than 100% by weight of a refrigerant comprising a compound chosen from halogenated hydrocarbons, perhalogenated compounds, fluorinated ketones, fluorinated ethers and also their combinations, and from more than 0% to 80% by weight of a dielectric fluid, for cooling a battery, the battery comprising energy storage cells immersed in the heat-transfer composition, and the heat-transfer composition undergoing evaporation on contact with the energy storage cells.

2 . The use as claimed in claim 1 , in which the heat-transfer composition circulates in a heat-transfer circuit.

3 . The use as claimed in claim 2 , in which the battery comprises one or more modules each comprising an enclosure in which energy storage cells are arranged, the enclosure(s) forming part of the heat-transfer circuit.

4 . The use as claimed in claim 2 , in which the heat-transfer circuit is thermally coupled to a secondary circuit containing an additional transfer composition.

5 . The use as claimed in claim 4 , in which the secondary circuit is the air conditioning circuit of a vehicle; and/or is a reversible heat pump circuit.

6 . The use as claimed in claim 1 , in which the refrigerant comprises or is 1-chloro-3,3,3-trifluoropropene or is a binary mixture or of 1,1,1,4,4,4-hexafluorobut-2-ene in the Z form and of 1,2-dichloroethylene in the E form.

7 . The use as claimed in claim 1 , in which the dielectric fluid is chosen from mineral dielectric oils, synthetic dielectric oils and vegetable dielectric oils.

8 . The use as claimed in claim 1 , in which the battery is the battery of an electric or hybrid vehicle.

9 . The use as claimed in claim 1 , implemented during the charging of the battery of the vehicle.

10 . A battery assembly, in particular for an electric or hybrid vehicle, comprising one or more modules each comprising an enclosure in which are arranged energy storage cells immersed in a heat-transfer composition, the heat-transfer composition comprising from 20% to less than 100% by weight of a refrigerant comprising a compound chosen from halogenated hydrocarbons, perhalogenated compounds, fluorinated ketones, fluorinated ethers as well as their combinations, and from more than 0% to 80% by weight of a dielectric fluid, the battery assembly being configured so that the heat-transfer composition undergoes evaporation in order to cool the battery.

11 . The battery assembly as claimed in claim 10 , comprising a heat-transfer circuit in which the heat-transfer composition circulates, the enclosure(s) of the module(s) being incorporated in this heat-transfer circuit.

12 . The battery assembly as claimed in claim 11 , in which the heat-transfer circuit comprises a pump; and/or in which the heat-transfer circuit comprises a heat exchanger in order to make possible heat exchange of the heat-transfer composition either with the ambient air or with a heat-transfer composition in a secondary circuit.

13 . The battery assembly as claimed in claim 10 , in which the refrigerant comprises or is 1-chloro-3,3,3-trifluoropropene or is a binary mixture or of 1,1,1,4,4,4-hexafluorobut-2-ene in the Z form and of 1,2-dichloroethylene in the E form.

14 . The battery assembly as claimed in claim 10 , in which the dielectric fluid is chosen from mineral dielectric oils, synthetic dielectric oils and vegetable dielectric oils.

15 . A method of regulation of the temperature of the battery of the battery assembly as claimed in claim 10 , comprising the cooling of the energy storage cells by the heat-transfer composition by partial evaporation of the heat-transfer composition.