Battery with compression and prevention of thermal runaway propagation features

Patent metadata

Field	Value
Publication number	US-10873111-B2
Application number	US-201615286952-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Aug 9, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A battery includes a metal can having a bottom, a top opening, and four sides. The battery also includes a plurality of cells stacked inside the metal can, wherein at least two opposing sides of the four sides of the metal can are biased inward against the plurality of cells to provide compression.

First claim

What is claimed is:

1. A battery, comprising:
a metal can having a bottom, a top opening, and four sides; and
a plurality of cells stacked inside the metal can, wherein:
at least two opposing sides of the four sides of the metal can are biased inward against the plurality of cells to provide compression;
the plurality of cells are stacked with a plurality of insulation layers and a plurality of double-sided fins;
a double-sided fin of the plurality of double-sided fins is located between a cell of the plurality of cells and an insulation layer of the plurality of insulation layers;
intumescent paint is applied to one side of the double-sided fin, the one side facing the insulation layer; and
the intumescent paint is not applied to another side of the double-sided fin facing the cell.

2. The battery of claim 1 , wherein the plurality of cells includes a pouch cell.

3. The battery of claim 1 , wherein the metal can is manufactured using one or more of the following: impact extrusion or deep drawing.

4. The battery of claim 1 , wherein the metal can includes 1000 series aluminum.

5. The battery of claim 1 , wherein the metal can includes a flanged top.

6. The battery of claim 1 , wherein:
the plurality of insulation layers includes aerogel; and
the plurality of cells includes a pouch cell.

7. The battery of claim 1 further comprising:
a lid having an underside; and
a plurality of tabs, wherein:
the plurality of cells are electrically connected via the plurality of tabs; and
the plurality of tabs are prevented from pulling down on the underside of the lid by the inward biasing of the metal can.

8. The battery of claim 1 , wherein:
one of the sides of the metal can has a first vent hole and a second vent hole, wherein the first vent hole is on a first side of a vertical axis which runs through said side of the metal can and the second vent hole is on a second side of the vertical axis; and
if the first vent hole were rotated about the vertical axis to produce a rotated first vent hole, the rotated first vent hole would not overlap with the second vent hole.

9. The battery of claim 1 , wherein:
one of the sides of the metal can has a first vent hole and a second vent hole, wherein the first vent hole is on a first side of a vertical axis which runs through said side of the metal can and the second vent hole is on a second side of the vertical axis;
if the first vent hole were rotated about the vertical axis to produce a rotated first vent hole, the rotated first vent hole would not overlap with the second vent hole; and
the first vent hole and the second vent hole are covered by tape.

10. The battery of claim 1 , wherein:
a first side of a first metal can has a first vent hole;
a second side of a second metal can has a second vent hole, wherein the bottom of the first vent hole is higher than the top of the second vent hole; and
if the first metal can and the second metal can were placed next to each other with the first side facing the second side, the first vent hole and the second vent hole would not overlap.

11. The battery of claim 1 , wherein:
a first side of a first metal can has a first vent hole;
a second side of a second metal can has a second vent hole, wherein the bottom of the first vent hole is higher than the top of the second vent hole;
if the first metal can and the second metal can were placed next to each other with the first side facing the second side, the first vent hole and the second vent would not overlap; and
the first vent hole and the second vent hole are covered by tape.

12. The battery of claim 1 , wherein intumescent paint is applied to one or more of the following: an underside of a lid, insulation, or a side of one of the plurality of cells adjacent to insulation.

13. The battery of claim 1 , wherein the double-sided fin has one bent portion at each end of the double-sided fin.

14. The battery of claim 1 , wherein the double-sided fin has one bent portion at each end of the double-sided fin, the one bent portion acting like a spring.

15. The battery of claim 1 , wherein:
a side of the metal can has a vent hole;
the vent hole is covered with thermally conductive tape; and
the thermally conductive tape permits cooling during forward flight in aircraft applications.

Assignees

• Wisk Aero Llc

Inventors

• Melack John
• Muniz Thomas P
• Murthy Nihal

Classifications

• H01M10/658

  by thermal insulation or shielding · CPC title

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title

• H01M50/24

  adapted for protecting batteries from their environment, e.g. from corrosion (thermal insulation H01M10/658) · CPC title

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title