Longitudinal constraints for energy storage devices

Patent metadata

Field	Value
Publication number	US-11239488-B2
Application number	US-201916363242-A
Country	US
Kind code	B2
Filing date	Mar 25, 2019
Priority date	May 14, 2015
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

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 sealed secondary battery 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 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, 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, and
the constraint comprises first and second compression members that overlie the first and second longitudinal end surfaces, respectively, the first and second compression members being connected by at least one tension member that overlies the lateral surface and pulls the compression members toward each other,
wherein the secondary battery has a rated capacity and the constraint places the first and second longitudinal end surfaces under a compressive load of at least 100 psi when the secondary battery is charged to at least 80% of its rated capacity,
wherein the constraint comprises a material having an ultimate tensile strength of at least 10,000 psi.

2. The secondary battery of claim 1 , wherein each member of the population of electrode structures comprises an anodically active material selected from the group consisting of metals, alloys, oxides and compounds capable of forming an alloy with lithium.

3. The secondary battery of claim 1 , wherein each member of the population of electrode structures comprises a layer of electrode active material comprising graphite.

4. The secondary battery of claim 1 , wherein each member of the population of electrode structures comprises a layer of electrode active material comprising silicon.

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

6. The secondary battery of claim 1 wherein a combined surface area of the first and second longitudinal end surfaces is less than 33% of the surface area of the electrode assembly.

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

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

9. 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.

10. 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.

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

12. 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.

13. 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.

14. 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.

15. The secondary battery of claim 1 wherein 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.

16. The secondary battery of claim 1 wherein the first and second longitudinal end surfaces are under a compressive load of at least 500 psi when the secondary battery is charged to at least 80% of its rated capacity.

17. The secondary battery of claim 1 wherein the first and second longitudinal end surfaces are under a compressive load of at least 700 psi when the secondary battery is charged to at least 80% of its rated capacity.

18. The secondary battery of claim 1 wherein the first and second longitudinal end surfaces are under a compressive load of at least 900 psi when the secondary battery is charged to at least 80% of its rated capacity.

19. The secondary battery of claim 1 wherein the electrode structures comprise an anodically active electroactive material and the counter-electrode structures comprise a cathodically active electroactive material.

20. The secondary battery of claim 1 wherein the electrode structures comprise an anodically active electroactive material comprising silicon and the counter-electrode structures comprise a cathodically active electroactive material.

21. The secondary battery of claim 1 , wherein the secondary battery comprises a set of at least two electrode assemblies and the constraint maintains a pressure on the electrode assemblies within the set as the secondary battery is cycled between the charged and the discharged states.

22. The secondary battery of claim 1 wherein the electrode assembly comprises at least 5 electrode structures and at least 5 counter-electrode structures.

23. The secondary battery of claim 1 wherein the electrode assembly comprises at least 50 e

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