Cell to heat sink thermal adhesive

Patent metadata

Field	Value
Publication number	US-10700317-B2
Application number	US-201514815447-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Apr 13, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A battery module includes a housing having an opening and an electrochemical cell disposed in the housing. The electrochemical cell includes a first cell surface having electrode terminals and an second cell surface substantially opposite the first cell surface. The battery module also includes a heat sink integral with the housing and disposed substantially opposite the opening of the housing and a thermally conductive adhesive bonded to the second cell surface and a heat sink surface that is facing the second cell surface. The thermally conductive adhesive includes a bonding shear strength and bonding tensile strength between the electrochemical cell and the heat sink of between approximately 5 megaPascals (MPa) and 50 MPa.

First claim

The invention claimed is:

1. A method of manufacturing a battery module, comprising:
applying an adhesive to a housing of the battery module at an interface between an electrochemical cell and a heat sink of the battery module, wherein the adhesive comprises a viscosity of between approximately 40,000 centipoise (cP) and approximately 50,000 cP and a working life of between approximately 1 hour and approximately 3 hours;
inserting the electrochemical cell into the housing toward the heat sink after applying the adhesive; and
curing the adhesive to secure the electrochemical cells to the heat sink at the interface.

2. The method of claim 1 , wherein the adhesive has a thermal conductivity of approximately 0.5 Watt/meter Kelvin (W/mK) and approximately 2.0 W/mK.

3. The method of claim 1 , wherein the adhesive comprises a hardness equal to approximately 80 Shore D after curing.

4. The method of claim 1 , wherein the adhesive is a two-component system comprising an epoxy resin and a hardener.

5. The method of claim 4 , comprising mixing the epoxy resin and the hardener at a ratio of between 1:1 and 2:1 epoxy resin to hardener before applying the adhesive to the housing.

6. The method of claim 1 , wherein the adhesive comprises an ultraviolet light curable epoxy resin.

7. The method of claim 1 , wherein the viscosity is such that the adhesive is self-leveling.

8. The method of claim 1 , wherein the adhesive has an aluminum-to-aluminum bonding shear strength and bonding tensile strength between approximately 5 megapascals (MPa) and approximately 50 MPa.

9. The method of claim 1 , wherein the electrochemical cell and the heat sink each comprise a metallic surface at the interface, and wherein the metallic surface comprises aluminum, copper, or steel.

10. The method of claim 1 , wherein curing the thermally conductive adhesive to secure the plurality of electrochemical cells to the heat sink interface comprises applying heat to an exterior of the housing.

Assignees

• CPS Techology Holdings LLC
• Cps Tech Holdings Llc

Inventors

• Tyler Matthew R
• Zhang Xugang

Classifications

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/658

  by thermal insulation or shielding · CPC title

• H01M50/516

  by welding, soldering or brazing · CPC title

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/264

  for cells or batteries, e.g. straps, tie rods or peripheral frames · CPC title