Longitudinal constraints for energy storage devices

Patent metadata

Field	Value
Publication number	US-10283807-B2
Application number	US-201615572722-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 14, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A energy storage device for cycling between a charged state and a discharged state, the energy storage device including an enclosure, an electrode assembly and a non-aqueous liquid electrolyte within the enclosure, and a constraint that maintains a pressure on the electrode assembly as the energy storage device is cycled between the charged and the discharged states.

First claim

What is claimed is:

1. A sealed secondary battery for cycling between a charged state and a discharged state, the sealed secondary battery comprising an enclosure that seals the contents of the secondary battery, an electrode assembly and a non-aqueous liquid electrolyte within the enclosure, and a constraint within the enclosure that maintains a pressure on the electrode assembly as the energy storage device is cycled between the charged and the discharged states, the electrode assembly comprising a population of electrode structures, a population of counter-electrode structures and an electrically insulating microporous separator material between members of the electrode and counter-electrode populations wherein
the electrode assembly has opposing first and second longitudinal end surfaces separated along a longitudinal axis, and a lateral surface surrounding the longitudinal axis and connecting the first and second longitudinal end surfaces, a combined surface area of the first and second longitudinal end surfaces being less than 33% of a combined surface area of the lateral surface and the first and second longitudinal end surfaces,
members of the electrode population and members of the counter-electrode population are arranged in an alternating sequence in a stacking direction that parallels the longitudinal axis within the electrode assembly,
the constraint comprises first and second compression members connected by at least one tension member that pulls the compression members toward each other, and
the constraint maintains a pressure on the electrode assembly in the stacking direction that exceeds the pressure maintained on the electrode assembly in each of two directions that are mutually perpendicular and perpendicular to the stacking direction.

2. The secondary battery of claim 1 , wherein the constraint comprises first and second compression members that overly the longitudinal end surfaces of the electrode assembly.

3. The secondary battery of claim 1 , wherein the constraint comprises at least one compression member that is internal to the longitudinal end surfaces.

4. The secondary battery of claim 1 , wherein a projection of the members of the electrode population and the counter-electrode populations onto the first longitudinal surface circumscribes a first projected area and a projection of the members of the electrode population and the counter-electrode populations onto the second longitudinal surface circumscribes a second projected area, and wherein the first and second projected areas each comprise at least 50% of the surface area of the first and second longitudinal end surfaces, respectively.

5. The secondary battery of claim 1 , wherein a projection of the members of the electrode population and the counter-electrode populations onto the first longitudinal surface circumscribes a first projected area and a projection of the members of the electrode population and the counter-electrode populations onto the second longitudinal surface circumscribes a second projected area, and wherein the constraint imposes an average compressive force to each of the first and second projected areas of at least 0.7 kPa, averaged over the surface area of the first and second projected areas, respectively.

6. The secondary battery of claim 5 , wherein the constraint imposes an average compressive force to each of the first and second projected areas of at least 2.8 kPa, averaged over the surface area of the first and second projected areas, respectively.

7. The secondary battery of claim 5 wherein the constraint imposes an average compressive force to each of the first and second projected areas of at least 5.25 kPa, averaged over the surface area of the first and second projected areas, respectively.

8. The secondary battery of claim 5 wherein constraint imposes an average compressive force to each of the first and second projected areas of at least 8.75 kPa, averaged over the surface area of the first and second projected areas, respectively.

9. The secondary battery of claim 1 wherein the combined surface area of the first and second longitudinal end surfaces is less than 25% of the surface area of the electrode assembly.

10. The secondary battery of claim 1 wherein the combined surface area of the first and second longitudinal end surfaces is less than 15% of the surface area of the electrode assembly.

11. The secondary battery of claim 1 wherein the constraint and enclosure have a combined volume that is less than 60% of the volume enclosed by the enclosure.

12. The secondary battery of claim 1 wherein the constraint and enclosure have a combined volume that is less than 30% of the volume enclosed by the enclosure.

13. The secondary battery of claim 1 wherein each member of the electrode population has a bottom, a top, a length L E , a width W E , a height H E , and a central longitudinal axis A E extending from the bottom to the top of each such member and in a direction that is generally transverse to the stacking direction, the length L E of each member of the electrode population being measured in the direction of its central longitudinal axis A E , the width W E of each member of the electrode population being measured in the stacking direction, and the height H E of each member of the electrode population being measured in a direction that is perpendicular to the central longitudinal axis A E of each such member and to the stacking direction, the ratio of L E to each of W E and H E of each member of the electrode population being at least 5:1, respectively, the ratio of H E to W E for each member of the electrode population being between 0.4:1 and 1000:1, respectively.

14. The secondary battery of claim 1 wherein the microporous separator material comprises a particulate material and a binder, has a void fraction of at least 20 vol. %, and is permeated by the non-aqueous liquid electrolyte.

15. The secondary battery of claim 1 wherein the distance between the at least one tension member and the lateral surface is less than 50% of the smallest Feret diameter of the electrode assembly, with the Feret diameter being measured in the same direction as the distance between the at least one tension member and the lateral surface of the electrode assembly.

16. The secondary battery of claim 1 wherein the distance between the at least one tension member and the lateral surface is less than 30% of the smallest Feret diameter of the electrode assembly, with the Feret diameter being measured in the same direction as the distance between the at least one tension member and the lateral surface of the electrode assembly.

17. The secondary battery of claim 1 wherein the distance between the at least one tension member and the lateral surface is less than 10% of the smallest Feret diameter of the electrode assembly, with the Feret diameter being measured in the same direction as the distance between the at least one tension member and the lateral surface of the electrode assembly.

18. The secondary battery of claim 1 wherein the secondary battery has a rated capacity, and the first and second longitudinal end surfaces are under a compressive load of at least 100 psi when the secondary battery is charged to at least 80% of its rated capacity.

19. The secondary battery of claim 1 wherein the secondary battery has a rated capacity, and the first and second longitudinal end surfaces are under a compressive load of at least 300 psi when the secondary battery is charged to at least 80% of its rated capacity.

20. The sec

Assignees

• Enovix Corp

Inventors

• Busacca Robert S
• Lahiri Ashok
• Ramasubramanian Murali
• Valdes Bruno A
• Dales Gardner Cameron
• Spindt Christopher J
• Ho Geoffrey Matthew
• Rust Iii Harrold J
• Wilcox James D
• Varni John F
• Lee Kim Han
• Shah Nirav S
• Contreras Richard J
• Van Erden Lynn
• Matsubayashi Ken S
• Dalton Jeremie J

Classifications

• H01M50/497

  Ionic conductivity · CPC title

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M50/417

  Polyolefins · CPC title