Thermal management of energy storage devices via oscillating heat pipes

• US 10,693,201 B2
• Filed: 12/13/2017
• Issued: 06/23/2020
• Est. Priority Date: 12/13/2016
• Status: Active Grant

• Current Assignee: Thermavant Technologies, LLC
• Original Assignee: Thermavant Technologies, LLC
• Inventors: Smoot, Christopher D., Boswell, Joe, Wilson, Corey A.
• Primary Examiner(s): Jelsma, Jonathan G
• Application Number:
  US15/840,708
• Publication Number:
  US 20180166757A1
• Time in Patent Office: 923 Days
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/6552 Closed pipes transferring heat by thermal conductivity or phase transition, e.g. heat pipes
• CPC Class Codes: H01M 10/6555 arranged between the cells
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 50/502 Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
• CPC Class Codes: H01M 50/505 comprising a single busbar
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A thermal management system for the at least one energy cell. The thermal management system includes a cold plate cell holder comprising at least one energy cell reservoir structured to retain the energy cell(s) and surround at least a first portion of a surface of the energy cell(s), and to thermally cool the energy cell(s). The system additionally includes a bus bar header to which one or more bus bar can be physically and thermally connected, and at least one oscillating heat pipe (OHP) cover disposable around a second portion of the surface of the energy cell(s). The OHP cover(s) is/are thermally and mechanically connectable to the cold plate cell holder when disposed around the energy cell(s). The OHP cover(s) is/are structured and operable to thermally cool the energy cell(s) via heat absorption from the second portion of the surface of the energy cell(s) when disposed around the energy cell(s).

Claims

1. A thermal management system for an electrical energy cell, said system comprising:

a cold plate cell holder comprising at least one energy cell reservoir structured to retain at least one electrical energy cell and to surround a first portion of a surface of the at least one energy cell when the at least one energy cell is retained therein, the cold plate cell holder structured and operable to thermally cool the at least one energy cell via heat absorption from the first portion of the surface of the at least one energy cell when the at least one energy cell is retained therein; and

at least one oscillating heat pipe cover, each of the at least one oscillating heat pipe cover independently disposable around a second portion of the surface of at least one respective energy cell when the at least one respective energy cell is retained within the cold plate cell holder, each of the at least one oscillating heat pipe cover comprising at least one oscillating heat pipe disposed internally therein, and each of the at least one oscillating heat pipe cover thermally and mechanically connectable directly to the cold plate cell holder when disposed around the at least one respective energy cell such that each of the at least one oscillating heat pipe cover is directly connected to, and in thermally conductive contact with, the cold plate and such that the at least one respective energy cell is thermally isolated, and whereby via the direct connection and thermally conductive contact, each of the at least one oscillating heat pipe cover will independently transfer heat absorbed from the second portion of the surface of the respective at least one energy cell directly to the cold plate cell holder.

2. The system of claim 1, wherein the at least one oscillating heat pipe cover is shaped to have substantially the same shape as an exterior shape of the second portion of the at least one energy cell that the at least one oscillating heat pipe cover is disposable around.

3. The system of claim 1, wherein the at least one oscillating heat pipe cover has at least one meandering heat pipe channel formed internally therein, and wherein the at least one meandering heat pipe channel is partially filled with a cooling fluid.

4. The system of claim 3, wherein the cooling fluid is selected to have thermal characteristics such that when the at least one oscillating heat pipe cover is disposed around the second portion of the surface of the at least one energy cell and thermally and mechanically connected to the cold plate cell holder, the cooling fluid will absorb heat from the at least one energy cell causing portions of the cooling fluid to change from a liquid phase to a vapor phase causing thermal expansion of the cooling fluid whereby the cooling fluid will move within the meandering heat pipe channel and transfer the absorbed heat to the cold plate cell holder via the thermal and mechanical connection of the oscillating heat pipe cover to the cold plate cell holder.

5. The system of claim 4, wherein the cooling fluid in the at least one meandering heat pipe channel is selected such that when a temperature of the at least one energy cell disposed in a first one of the at least one energy cell reservoirs and thermally isolated by the respective at least one heat pipe cover exceeds a maximum threshold, the heat absorbed by the cooling fluid will cause the cooling fluid to cease to transfer the absorbed heat to the cold plate cell holder such that the respective at least one oscillating heat pipe cover will be a thermal barrier to the heat from the at least one energy cell in the first energy cell reservoir propagating to an energy cell disposed in an energy cell reservoir adjacent the first energy cell reservoir.

6. The system of claim 1, wherein the at least one oscillating heat pipe cover comprises a plurality of oscillating heat pipe covers disposable around the one or more energy cells disposed within a single energy cell reservoir.

7. The system of claim 1, wherein the cold plate cell holder comprises a bus bar header to which one or more bus bar of the system can be physically and thermally connected.

8. The system of claim 7, wherein each bus bar comprises a heat transfer barrier that extends into the respective bus bar from a top surface of the respective bus bar toward a bottom surface of the respective bus bar.

9. The system of claim 1, wherein the cold plate cell holder comprises a coolant channel that meanders through an interior of the cold plate, and through which a coolant is circulated to remove heat from the cold plate cell holder.

10. The system of claim 9, wherein the coolant circulated through the cold plate cell holder coolant channel comprises one of a liquid, a gas, and a phase change medium.

11. An electrical power storage device, said device comprising:

at least one electrical energy cell; and

a thermal management system for the at least one energy cell, wherein the thermal management system comprises;

a cold plate cell holder comprising;

at least one energy cell reservoir structured to retain the at least one energy cell and surround at least a first portion of a surface of the at least one energy cell, the cold plate cell holder structured and operable to thermally cool the at least one energy cell via heat absorption from the first portion of the surface of the at least one energy cell; and

a bus bar header to which one or more bus bar of the system can be physically and thermally connected; and

at least one oscillating heat pipe cover, each of the at least one oscillating heat pipe cover independently disposed around a second portion of the surface of at least one respective energy cell, each of the at least one oscillating heat pipe cover comprising at least one oscillating heat pipe disposed internally therein, and each of the at least one oscillating heat pipe cover thermally and mechanically connected directly to the cold plate cell holder such that each of the at least one oscillating heat pipe cover is directly connected to, and in thermally conductive contact with, the cold plate and such that the at least one respective energy cell is thermally isolated, and whereby via the direct connection and thermally conductive contact, each of the at least one oscillating heat pipe cover will independently transfer heat absorbed from the second portion of the surface of the at least one energy cell directly to the cold plate cell holder.

12. The device of claim 11, wherein the at least one oscillating heat pipe cover is shaped to have substantially the same shape as an exterior shape of the second portion of the at least one energy cell that the at least one oscillating heat pipe cover is disposed around.

13. The device of claim 11, wherein the at least one oscillating heat pipe cover has at least one meandering heat pipe channel formed internally therein, and wherein the at least one meandering heat pipe channel is partially filled with a cooling fluid.

14. The device of claim 13, wherein the cooling fluid is selected to have thermal characteristics such that the cooling fluid will absorb heat from the at least one energy cell causing portions of the cooling fluid to change from a liquid phase to a vapor phase causing thermal expansion of the cooling fluid whereby the cooling fluid will move within the meandering heat pipe channel and transfer the absorbed heat to the cold plate cell holder via the thermal and mechanical connection to the cold plate cell holder.

15. The device of claim 14, wherein the cooling fluid is selected to have thermal characteristics such that when a temperature of the at least one energy cell disposed in a first one of the at least one energy cell reservoirs, and thermally isolated by the respective at least one heat pipe cover, exceeds a maximum threshold, the heat absorbed by the cooling fluid will cause substantially all the cooling fluid to change to the vapor phase whereby the vapor phase cooling fluid will no longer transfer heat to the cold plate cell holder such that the respective at least one oscillating heat pipe cover will be a thermal barrier to the heat from the at least one energy cell disposed in the first energy cell reservoir from propagating to an energy cell disposed in an energy cell reservoir adjacent the first energy cell reservoir.

16. The device of claim 11, wherein the at least one oscillating heat pipe cover comprises a plurality of oscillating heat pipe covers disposed around the one or more energy cells disposed within a single energy cell reservoir.

17. The device of claim 11, wherein the at least one energy cell comprises a plurality of energy cells retained within a plurality of energy cell reservoirs of the cold plate cell holder, and the at least one oscillating heat pipe cover comprises a plurality of oscillating heat pipe covers that are physically connected to the cold plate cell holder such that there is a space between adjacent oscillating heat pipe covers.

18. The system of claim 11, wherein each bus bar comprises a heat transfer barrier that extends into the respective bus bar from a top surface of the respective bus bar toward a bottom surface of the respective bus bar.