Use of a diester in a cooling and/or lubricating composition for an electric or hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2025382540-A1
Application number	US-202318993538-A
Country	US
Kind code	A1
Filing date	Jul 11, 2023
Priority date	Jul 13, 2022
Publication date	Dec 18, 2025
Grant date	—

Abstract

Use of a diester in a composition for cooling and/or lubrication of an electric or hybrid vehicle
The present invention relates to the use, for cooling and/or lubricating a propulsion system of an electric or hybrid vehicle, of a composition comprising one or a plurality of diesters, each of said diesters being formed between a diol containing from 3 to 12 carbon atoms and two monocarboxylic acids, identical or different, including a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms.

First claim

1 . A method for cooling and/or lubricating at least one part of a propulsion system of an electric or hybrid vehicle, said method comprising at least one step of bringing said at least one part into contact with a composition comprising one or a plurality of diesters, each of said diesters being formed between a diol containing from 3 to 12 carbon atoms and two monocarboxylic acids, identical or different, including a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms.

2 . The method according to claim 1 , wherein the linear or branched hydrocarbon chain having from 4 to 10 carbon atoms is a linear or branched, saturated or unsaturated alkyl or alkylene chain consisting of carbon and hydrogen atoms.

3 . The method according to claim 1 , wherein the composition comprises at least 5% by weight of said diester(s), relative to the total weight of the composition.

4 . The method according to claim 1 wherein the composition comprises:
from 5 to 95% by weight of the diester or diesters, and
from 5 to 95% by weight of one or a plurality of base oils different from said diesters,

with respect to the total weight of the diester(s) and base oils different from the diesters.

5 . The method according to claim 1 , wherein the at least one part of a propulsion system of an electric or hybrid vehicle comprises the battery and/or the power electronic components of an electric or hybrid vehicle.

6 . The method according to claim 1 , wherein said diester has from 13 to 25 carbon atoms, preferably from 15 to 24 carbon atoms.

7 . The method according to claim 1 , wherein the diester or the diesters correspond to the formula (I):

wherein:
R 1 represents a linear or branched, saturated or unsaturated hydrocarbon chain having from 3 to 9 carbon atoms, preferably from 4 to 8 carbon atoms, preferably from 5 to 7 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms; and
R 2 represents a linear or branched, saturated or unsaturated hydrocarbon chain having from 4 to 9 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms; and
R 3 represents a linear or branched, saturated or unsaturated hydrocarbon chain having from 3 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms.

8 . The method according to claim 1 , wherein said diester has a kinematic viscosity at 100° C. ranging from 1 to 6 mm 2 /s.

9 . The method according to claim 1 , wherein at least one of the two hydroxyl functions of the diol is supported by a primary carbon atom.

10 . The method according to claim 1 , wherein the diol is chosen from 1,2-propanediol, 1,2-decanediol and 1,3-alkanediols including from 3 to 10 carbon atoms.

11 . The method according to claim 1 , wherein the diol is chosen from 1,2-propanediol and 1,3-propanediol.

12 . The method according to claim 1 , wherein said monocarboxylic acids, either identical or different, include a linear hydrocarbon chain having from 4 to 10 carbon atoms.

13 . The method according to claim 1 , wherein the diester(s) is (are) chosen from:
one or a plurality of diesters formed between: a diol chosen from 1,2 decanediol and 1,3 propanediol, and two monocarboxylic acids, identical or different, including a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, a diester formed from 1,2-propanediol and two heptanoic acids, a diester formed from 1,2-propanediol and two octanoic acids, a diester formed from 1,2-propanediol and two decanoic acids, a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid, and mixtures thereof.

14 . The method according to claim 1 , wherein the diester or diesters are chosen from:
a diester formed from 1,2-decanediol and two heptanoic acids, a diester formed from 1,2-decanediol and two pentanoic acids, a diester formed from 1,2-propanediol and two heptanoic acids, a diester formed from 1,2-propanediol and two nonanoic acids, a diester formed from 1,3-propanediol and two heptanoic acids, a diester formed from 1,2-propanediol and two octanoic acids, a diester formed from 1,2-propanediol and two decanoic acids, a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid, and mixtures thereof.

15 . The method according to claim 1 , characterized in that said composition comprises, in addition to said diester(s), at least one additive chosen from antioxidants, pour point depressants, anti-foam agents, anticorrosion agents, anti-wear and/or extreme-pressure additives, friction modifiers, detergents, dispersants and mixtures thereof.

16 . The method according to claim 5 , wherein the battery is a lithium-ion or nickel-cadmium battery.

17 . The method according to claim 1 , wherein the diester or the diesters have a kinematic viscosity at 100° C. ranging from 1 to 4 mm 2 /s.

Assignees

• Totalenergies Onetech

Inventors

• Crozet Delphine
• Limoges Alice
• Dalix Laurent
• El Bahi Hakim

Classifications

• C10N2040/14

  Electric or magnetic purposes · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2207/283

  of polyhydroxy compounds · CPC title