	US 12,334,583 B2
	Battery with improved gas to moisture permeability ratio
Kotaro Kobayashi, Tokyo (JP)
Assigned to W. L. Gore & Associates G.K., Tokyo (JP)
Appl. No. 17/767,560
Filed by W. L. Gore & Associates G.K., Tokyo (JP)
PCT Filed Oct. 21, 2019, PCT No. PCT/IB2019/001124 § 371(c)(1), (2) Date Apr. 8, 2022, PCT Pub. No. WO2021/079163, PCT Pub. Date Apr. 29, 2021.
Prior Publication US 2022/0399611 A1, Dec. 15, 2022
Int. Cl. H01M 50/30 (2021.01); B01D 69/02 (2006.01); B01D 69/12 (2006.01); B01D 71/32 (2006.01); B01D 71/36 (2006.01); H01M 10/0525 (2010.01); H01M 50/317 (2021.01); H01M 4/02 (2006.01); H01M 4/38 (2006.01); H01M 4/485 (2010.01); H01M 4/505 (2010.01); H01M 4/525 (2010.01); H01M 4/58 (2010.01); H01M 4/587 (2010.01); H01M 10/0567 (2010.01); H01M 10/0569 (2010.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01)

CPC H01M 50/394 (2021.01) [H01M 10/0525 (2013.01); H01M 50/317 (2021.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01); H01M 4/382 (2013.01); H01M 4/387 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 4/5825 (2013.01); H01M 4/587 (2013.01); H01M 10/0567 (2013.01); H01M 10/0569 (2013.01); H01M 50/417 (2021.01); H01M 50/426 (2021.01); H01M 2300/0028 (2013.01)]

14 Claims

1. A battery comprising:

a housing,

wherein the housing comprises an opening;

a positive electrode,

wherein the positive electrode is at least partially disposed within the housing;

a negative electrode,

wherein the negative electrode is at least partially disposed within the housing;

an electrolyte,

wherein the electrolyte is disposed between the positive electrode and the negative electrode,

wherein the electrolyte is configured to release at least one gas during operation of the battery,

wherein the at least one gas is chosen from carbon dioxide (CO₂), hydrogen (H₂), carbon monoxide (CO), or any combination thereof; and

at least one fluoropolymer membrane,

wherein the at least one fluoropolymer membrane covers the opening of the housing,

wherein the at least one fluoropolymer membrane has a crystallinity of 85% to 100%;

wherein the at least one fluoropolymer membrane has a density of 2.0 g/cm³to 2.1 g/cm³;

wherein the at least one fluoropolymer membrane has a CO₂permeability to moisture permeability ratio of more than 0.5.

14. A device comprising:

a housing,

wherein the housing comprises an opening; and

at least one fluoropolymer membrane,

wherein the at least one fluoropolymer membrane covers the opening of the housing,

wherein the at least one fluoropolymer membrane has a crystallinity of 85% to 100%;

wherein the at least one fluoropolymer membrane has a density of 2.0 g/cm³to 2.1 g/cm³; and

wherein the at least one fluoropolymer membrane has a CO₂permeability to moisture permeability ratio of more than 0.5;

wherein the device is a battery.