BATTERY PACK FOR ENERGY STORAGE DEVICES

• US 20170149103A1
• Filed: 11/21/2016
• Published: 05/25/2017
• Est. Priority Date: 11/19/2015
• Status: Active Grant

• Current Assignee: IntraMicron, Inc.
• Original Assignee: IntraMicron, Inc.
• Inventors: Yang, Hongyun, Barron, Troy, Tatarchuk, Bruce, Dimick, Paul
• Granted Patent: US 10,454,147 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/653 characterised by electrically insulating or thermally conductive materials
• CPC Class Codes: H01M 10/6556 Solid parts with flow channel passages or pipes for heat exchange closed pipes H01M10/6552
• CPC Class Codes: H01M 10/6568 characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
• CPC Class Codes: H01M 10/658 by thermal insulation or shielding
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Battery packs for high energy density batteries (cells), particularly arrays of such batteries are described herein. The battery packs include a microfibrous media (MFM)-phase change materials (PCM) composite block and one or more active cooling structures. The MFM is typically sintered to the active cooling structures. The battery packs may contain more than one MFM-PCM composite block. Additionally or alternatively, the MFM-PCM composite block may contain different layers containing different MFM-PCM composites, which have different functionalities. In a preferred embodiment, at least one layer contains a flame retardant PCM, while at least one other layer contains a PCM with a lower melting temperature. The cells may be arranged in a repeating square or equilateral triangle pattern, with one or more active cooling structures in the geometric center of the square or triangle.

Claims

1. A battery pack comprising a microfibrous media (MFM)-phase change materials (PCM) composite block, one or more cells, and one or more cooling tubes, channels or a combination thereof,

wherein MFM is sintered to the cooling tubes and/or channels, and wherein the cells are aligned parallel with the cooling tubes and/or channels, and wherein the cells are aligned generally perpendicular to the planar direction of the MFM.

2. The battery pack of claim 1, wherein the MFM-PCM composite block comprises a plurality of cylindrical holes and wherein the cells are in the holes.

3. The battery pack of claim 1, comprising more than one MFM-PCM composite block, wherein each block contains the same or different materials.

4. The battery pack of claim 3, wherein one or more of the MFM-PCM composite blocks contains multiple layers, where at least one of the layers contains a different phase change material than the other layers.

5. The battery pack of claim 4, wherein at least one layer contains a flame retardant PCM, and wherein the other layers contain a PCM with a lower melting point than the flame retardant PCM.

6. The battery pack of claim 5, wherein the flame retardant PCM is a metal salt-based PCM.

7. The battery pack of claim 6, wherein the flame retardant PCM is magnesium sulfate heptahydrate (MgSO₄.7H₂O).

8. The battery pack of claim 1, wherein the PCM in at least one of the MFM-PCM composites is selected from the group consisting of paraffin waxes, glycols, and fatty acids.

9. The battery pack of claim 1, wherein the MFM in the MFM-PFM composite block has a thermal conductivity of at least 5 W/m-K.

10. The battery pack of claim 9, wherein the MFM has a volume fraction of at least 5%, and a metal surface area of at least 36 cm²/g of metal.

11. The battery pack of claim 1, wherein the PCM comprises one or more carbon materials selected from the group consisting of graphite, carbon nanotubes, and carbon fibers.

12. The battery pack of claim 2, wherein the holes are aligned in a repeating square or and equilateral triangle pattern.

13. The battery pack of claim 12, wherein at least one of the cooling tubes or channels is located in the geometric center of each pattern.

14. The battery pack of claim 1, wherein the MFM is sintered to the one or more cooling tubes or channels.

15. The battery pack of claim 1, further comprising an upper end plate, a lower end plate or both.

16. The battery pack of claim 15, wherein the end plates comprise channels that connect to one end of each of the cooling tubes or channels.

18. The battery pack of claim 2, wherein the cooling tubes comprise a cooling fluid selected from the group consisting of water, alcohol-water mixtures, salt-water solutions, and other refrigerants.

19. The battery pack of claim 1, further comprising a flame retardant covering than surrounds the MFM-PCM composite block.

17. The battery pack of clam 15, wherein the end plates comprise one or more venting holes that are open to the environment at one end and in contact with the cells at the opposite end.