IP Library › Granted Patent US 12,344,724
Granted Patent B2
US 12,344,724 · App. 18/456,067 · Granted Jul 1, 2025

Secondary battery pack with improved thermal management

Inventors: Virginia O'Neil (York, SC); Jessica Hanley (Allentown, PA); Matthew Kihara (Lake Wylie, SC); Leeanne Brown (Chester, SC); Michael John Watson (Fort Mill, SC); Matthew Paul Timmons (Charlotte, NC)
Assignee: Elkem Silicones USA Corp.
C08J9/32C08G77/20C08G77/38C08K3/40C08K7/28H01M10/052H01M10/0525H01M10/613H01M10/625H01M10/643H01M10/6551H01M10/6557H01M10/658H01M50/24H01M50/249H01M50/293C08G2330/50C08J2383/04C08K2201/002H01M50/204H01M2220/20Y02E60/10Y02T10/70
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Quick Facts
Patent No.
US 12,344,724
App. No.
18/456,067
Granted
Jul 1, 2025
Kind
B2
Abstract

The present invention relates to a novel secondary battery pack with improved thermal management useful for an all-electric vehicle (EV), a plug-in hybrid vehicle (PHEV), a hybrid vehicle (HEV), or battery packs used for other vehicles batteries, and more particularly, to the use of a specific material for thermally insulating a secondary battery pack and further minimizing the propagation of thermal runaway within a battery pack.

Claims (39)

1. A silicone rubber syntactic foam comprising a silicone rubber binder and hollow glass beads,

wherein said silicone rubber syntactic foam is obtained by curing an addition curing type organopolysiloxane composition X,

wherein the addition curing type organopolysiloxane composition X comprises:

(i) 100 parts by weight of an organopolysiloxane A having at least two alkenyl groups attached to silicon atoms in a molecule,

(ii) from more than 10 parts to 50 parts by weight of an organo-hydrogenpolysiloxane B having at least two, preferably at least three hydrogen atoms attached to silicon atoms in a molecule, and

(iii) a catalytic amount of an addition reaction catalyst C.

2. The silicone rubber syntactic foam of claim 1 , wherein B comprises a mixture of two silicon compounds B one comprising two telechelic hydrogen atoms bonded to silicon per molecule with no pendent hydrogen atoms bonded to silicon per molecule and the other comprising at least three hydrogen atoms bonded to silicon per molecule.

3. The silicone rubber syntactic foam of claim 1 , wherein the catalyst is an effective amount of hydrosilylation catalyst.

4. The silicone rubber syntactic foam of claim 1 , wherein C is a platinum based hydrosilylation catalyst C.

5. The silicone rubber syntactic foam of claim 1 , wherein the organopolysiloxane composition X further comprises at least one additives H selected from the group consisting of a pigment, a dye, clays, a surfactant, hydrogenated castor oil, wollastonite, aluminium trihydrate, magnesium hydroxide, halloysite, huntite hydromagnesite, expandable graphite, zinc borate, mica, afumed silica, or a combination thereof.

6. The silicone rubber syntactic foam of claim 1 , wherein the organopolysiloxane composition X further comprises at least one cure rate controller G which slows the curing rate of the silicone composition.

7. The silicone rubber syntactic foam of claim 1 , wherein the organopolysiloxane A is selected from the group of dimethylpolysiloxanes containing dimethylvinylsilyl end groups.

8. The silicone rubber syntactic foam of claim 1 , wherein the viscosity at 25° C. of the organopolysiloxane A is between 5 mPa·s and 60,000 mPa·s.

9. The silicone rubber syntactic foam of claim 1 , wherein the viscosity at 25° C. of the organopolysiloxane A is between 5 mPa·s and 5,000 mPa·s.

10. The silicone rubber syntactic foam of claim 1 , wherein the viscosity at 25° C. of the organopolysiloxane A is 5 mPa·s and 350 mPa·s.

11. The silicone rubber syntactic foam of claim 4 , wherein the viscosity at 25° C. of B comprises two telechelic hydrogen atoms bonded to silicon per molecule with no pendent hydrogen atoms bonded to silicon per molecule is between 5 and 100 mPa·s, and the viscosity at 25° C. of B comprising at least three hydrogen atoms bonded to silicon per molecule is between 5 and 2000 mPa·s.

12. The silicone rubber syntactic foam of claim 1 , wherein the viscosities at 25° C. of the organopolysiloxane A and B comprising at least two hydrogen atoms bonded to silicon per molecule are chosen so that the viscosity at 25° C. of the addition curing type organopolysiloxane composition X is between 500 mPa·s and 300,000 mPa·s.

13. The silicone rubber syntactic foam of claim 1 , wherein the addition curing type organopolysiloxane composition X has a viscosity is between 500 mPa·s to 5000 mPa·s.

14. The silicone rubber syntactic foam of claim 1 , wherein the addition curing type organopolysiloxane composition X has a viscosity is between 500 mPa·s to 2500 mPa·s.

15. The silicone rubber syntactic foam of claim 1 , wherein the hollow glass beads exhibit crush strengths ranging from 1.72 megapascal (250 psi) to 186.15 Megapascals (27,000 psi) at which ten percent by volume of the first plurality of hollow glass beads collapse.

16. The silicone rubber syntactic foam of claim 1 , wherein the hollow glass beads are hollow borosilicate glass microspheres.

17. The silicone rubber syntactic foam of claim 1 , wherein the hollow glass beads are hollow glass microspheres.

18. The silicone rubber syntactic foam of claim 1 , wherein the level of hollow glass beads is between 5% and 70% by volume of the silicone rubber syntactic foam.

19. A secondary battery pack comprising

at least one battery module casing in which is disposed a plurality of battery cells which are electrically connected to one another,

the silicone rubber syntactic foam of claim 1 , and said silicone rubber syntactic foam fills partially or fully open space of said battery module casing and/or covering partially or totally said battery cells and/or covering partially or totally said module casing, and

optionally a lid covering the battery module casing.

20. The secondary battery pack of claim 19 , wherein the secondary battery pack further comprises a coolant inlet manifold, a coolant outlet manifold and a plurality of thermal exchange tubes as heat dissipation members and extending between the inlet and outlet manifolds, said thermal exchange tubes are disposed at one or more interfaces between the battery cells and have a coolant passing through to exchange heat generated from the battery cells during the charge and discharge of the battery cells.

21. The secondary battery pack of claim 19 , wherein it is located within a vehicle.

22. The secondary battery pack of claim 19 , wherein it is located in an automotive motor vehicle.

23. The secondary battery pack of claim 19 , wherein it is located in an all-electric vehicle (EV), a plug-in hybrid vehicle (PHEV), or a hybrid vehicle (HEV).

24. The secondary battery pack of claim 19 , wherein it is located in an aircraft, a boat, a ship, a train, or wall unit.

25. A process for preparation of a secondary battery pack comprising:

(a) preparing at least one battery module casing in which is disposed a plurality of battery cells which are electrically connected to one another,

(b) introducing into the said battery module casing the silicone rubber syntactic foam of claim 1 ,

(c) filling completely or partially said battery module casing, and

(d) curing the silicone rubber syntactic foam, and optionally

(e) covering the battery module casing with a lid.

26. The silicone rubber syntactic foam of claim 1 , wherein the addition curing type organopolysiloxane composition X comprises 12 to 50 parts by weight of an organo-hydrogenpolysiloxane B having at least two, preferably at least three hydrogen atoms attached to silicon atoms in a molecule.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 25, 2023
From: O'NEIL, VIRGINIA; HANLEY, JESSICA; KIHARA, MATTHEW; BROWN, LEEANNE; WATSON, MICHAEL JOHN; TIMMONS, MATTHEW PAUL
To: ELKEM SILICONES USA CORP.
Reel/Frame 064707/0441 →
Continuity (6)
Continuation 18178099 · Mar 3, 2023
Continuation 17534730 · Nov 24, 2021
Continuation 16673628 · Nov 4, 2019
Continuation 15891037 · Feb 7, 2018
Provisional Application 62456502 · Feb 8, 2017
Related Publication 20230399483A1 · Dec 14, 2023
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