US 12,077,708 B2
Heat transfer liquid for cooling lithium storage batteries
Harald Dietl, Ludwigshafen (DE); and Roger Sieg, Ludwigshafen (DE)
Assigned to BASF SE
Appl. No. 17/288,255
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Oct. 25, 2019, PCT No. PCT/EP2019/079237
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/094428, PCT Pub. Date May 14, 2020.
Claims priority of application No. 18204600 (EP), filed on Nov. 6, 2018; application No. 19156712 (EP), filed on Feb. 12, 2019; and application No. 19156713 (EP), filed on Feb. 12, 2019.
Prior Publication US 2021/0380862 A1, Dec. 9, 2021
Int. Cl. C09K 5/10 (2006.01); C09K 5/20 (2006.01); H01M 8/04029 (2016.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01); H01M 10/613 (2014.01); H01M 10/6567 (2014.01)
CPC C09K 5/10 (2013.01) [C09K 5/20 (2013.01); H01M 8/04029 (2013.01); H01M 10/613 (2015.04); H01M 10/6567 (2015.04); H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2300/0028 (2013.01)] 20 Claims
 
1. A method of cooling a lithium-ion rechargeable battery, the method comprising:
transferring heat through a heat-transfer liquid comprising a component (A) and a component (B),
wherein component (A) comprises at least one alkylene glycol derivative of formula (I)

OG Complex Work Unit Chemistry
where
R1 is hydrogen or C1- to C4-alkyl,
R2 is C1- to C4-alkyl,
R3 is hydrogen or methyl, and
n is on arithmetic average a number from 3.0 to 4.0; and
wherein component (B) comprises at least one corrosion inhibitor selected from the group consisting of
(Ba) an orthosilicate ester and/or an alkoxyalkylsilane,
(Bb) an azole derivative, and
(Bc) a compound of general formula (II)

OG Complex Work Unit Chemistry
where
R4 is an organic radical having 6 to 10 carbon atoms,
p and q are independently of one another a positive integer from 1 to 30, and
each Xi for i=1 to p and 1 to q are independently of one another selected from the group consisting of —CH2—CH2—O—, —CH2—CH(CH3)—O—, —CH(CH3)—CH2—O—, —CH2—C(CH3)2—O—, —C(CH3)2—CH2—O—, —CH2—CH(C2H5)—O—, —CH(C2H5)—CH2—O—, —CH(CH3)—CH(CH3)—O—, —CH2—CH2—CH2—O— and —CH2—CH2—CH2—CH2—O—; and
wherein the lithium-ion rechargeable battery comprises as an electrolyte (E) at least one compound selected from the group consisting of lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium phosphate (Li3PO4), and lithium bis(oxalato)borate (LiBOB), and
wherein the heat-transfer liquid comprises less than 1 wt % of water.