Cooling and flame-retardant composition for a propulsion system of an electric or hybrid vehicle

Patent metadata

Field	Value
Publication number	US-11390789-B2
Application number	US-201917259287-A
Country	US
Kind code	B2
Filing date	Jul 10, 2019
Priority date	Jul 13, 2018
Publication date	Jul 19, 2022
Grant date	Jul 19, 2022

Abstract

The present invention relates to a composition for cooling a propulsion system of an electric or hybrid vehicle including at least one battery, comprising: (i) at least one base oil or at least one hydrocarbon-based fluid with a boiling point of greater than or equal to 50° C.; (ii) at least one fire retardant corresponding to formula (I)RF-L-RH  (I)in which RF is a perfluorinated or partially fluorinated group, RH is a hydrocarbon-based group, and L is a linker; and (iii) at least one fluoro compound with a boiling point of between 50 and 250° C.The invention also relates to the use of at least one fluoro compound with a boiling point of between 50° C. and 250° C. for promoting the contact between a fire retardant corresponding to formula (I) and an element of a propulsion system of an electric or hybrid vehicle, when thermal runaway is observed, said fire retardant of formula (I) being formulated in a base oil, or a hydrocarbon-based fluid with a boiling point of greater than or equal to 50° C.Finally, the invention relates to a process for cooling and fire-protecting at least one battery of a propulsion system of an electric or hybrid vehicle, comprising at least one step of placing at least one battery in contact with a composition according to the invention.

First claim

The invention claimed is:

1. A composition for cooling a propulsion system of an electric or hybrid vehicle, comprising:
at least one base oil, or at least one hydrocarbon-based fluid with a boiling point of greater than or equal to 50° C.;
at least one fire retardant represented by formula (I)
R F -L-R H   (I)

in which,
R F is a perfluorinated or partially fluorinated group,
R H is a hydrocarbon-based group, and
L is a linker; and

at least one fluoro compound having a boiling point of between 50° C. and 250° C.

2. The composition as claimed in claim 1 , wherein:
the fluoro compound is different from the fire retardant; and
the composition comprises the base oil or the hydrocarbon-based fluid in an amount of greater than or equal to 80% by weight, relative to the total weight of the composition.

3. The composition as claimed in claim 1 , wherein the composition comprises a mass ratio of the fire retardant to the fluoro compound of between 0.2 and 200.

4. The composition as claimed in claim 1 , wherein the composition comprises micelles formed by the fire retardant and containing the fluoro compound.

5. The composition as claimed in claim 1 , wherein L is chosen from the following divalent groups: —CH 2 —, —CH═CH—, —O—, —S—, or —PO 4 —.

6. The composition as claimed in claim 1 , wherein the composition comprises between 0.5% and 40% by weight of the fire retardant, relative to the total weight of the composition.

7. The composition as claimed in claim 1 , wherein the boiling point of the fluoro compound is between 55° C. and 120° C.

8. The composition as claimed in claim 1 , wherein the fluoro compound is a perfluorinated compound.

9. The composition as claimed in claim 1 , wherein the fluoro compound is chosen from perfluorooctane, perfluorocyclohexane, or mixtures thereof.

10. The composition as claimed in claim 1 , wherein the composition comprises between 0.01% and 20% by weight of the fluoro compound, relative to the total weight of the composition.

11. The composition as claimed in claim 1 , wherein the base oil is chosen from synthetic oils, poly-α-olefins, and polyalkylene glycols obtained by polymerization or copolymerization of alkylene oxides comprising from 2 to 8 carbon atoms.

12. The composition as claimed in claim 1 , wherein the hydrocarbon-based fluid has a boiling point of between 50° C. and 350° C.

13. The composition as claimed in claim 1 , wherein the hydrocarbon-based fluid is totally saturated.

14. The composition as claimed in claim 1 , wherein the hydrocarbon-based fluid comprises at least 90% by weight of isoparaffins, relative to the total weight of hydrocarbon-based fluid.

15. The composition as claimed in claim 1 , wherein the hydrocarbon-based fluid is obtained via a process of catalytic hydrogenation of a deoxygenated and/or isomerized feedstock of biological origin, at a temperature ranging from 80° C. to 180° C., and at a pressure ranging from 50 bar to 160 bar.

16. The composition as claimed in claim 1 , wherein the hydrocarbon-based fluid comprises from 98% to 100% by weight of isoparaffins, relative to the total weight of the hydrocarbon-based fluid, and the hydrocarbon-based fluid has a kinematic viscosity at 40° C. of less than or equal to 5 cSt.

17. The composition as claimed in claim 1 , wherein the composition comprises, relative to the total weight of the composition:
from 60% to 97.99% by weight of the base oil or the hydrocarbon-based fluid;
from 2% to 30% by weight of fire retardant; and
from 0.01% to 20% by weight of fluoro compound.

18. A method for promoting the contact between a fire retardant corresponding to formula (I) as defined in claim 1 and an element of a propulsion system of an electric or hybrid vehicle when thermal runaway is observed, comprising adding at least one fluoro compound having a boiling point of between 50° C. and 250° C. to a formulation comprising the fire retardant and a base oil or a hydrocarbon-based fluid having a boiling point of greater than or equal to 50° C.

19. A process for cooling and fire-protecting a battery of a propulsion system of an electric or hybrid vehicle, comprising contacting the battery with a composition as defined in claim 1 .

20. The process as claimed in claim 19 , wherein the contacting the battery comprises:
completely or partially immersing the battery in a static or circulating amount of the composition; or
injecting, jetting, misting, or spraying the composition on the battery using pressure or gravity.

Assignees

• Total Marketing Services

Inventors

• Lacroix Eric
• China Philippe
• Rondelez Francis

Classifications

• C10M169/04

  Mixtures of base-materials and additives · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10M131/04

  aliphatic · CPC title

• C10M135/22

  containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms · CPC title

• C10M2211/022

  aliphatic · CPC title