Galvanic element having solid-state cell stack

Patent metadata

Field	Value
Publication number	US-10826128-B2
Application number	US-201615299758-A
Country	US
Kind code	B2
Filing date	Oct 21, 2016
Priority date	Apr 22, 2014
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A galvanic element is provided having a solid-state cell stack containing a multiplicity of electrochemical solid-state cells stacked along a longitudinal axis in a housing. Each of the electrochemical solid-state cells has a stack including at least one anode layer, at least one cathode layer and at least one solid electrolyte layer arranged between the anode layer and the cathode layer. At least one of the electrochemical solid-state cells includes an elastically deformable compensation element, which at least partly compensates for a change in volume along the longitudinal axis of the stacked electrochemical solid-state cells. A method for producing such galvanic elements is also provided. Advantageous applications are found in vehicles and mobile devices including such galvanic elements.

First claim

What is claimed is:

1. A galvanic element having a solid-state cell stack comprising a multiplicity of electrochemical solid-state cells stacked along a longitudinal axis in a housing,
wherein each of the electrochemical solid-state cells along the longitudinal axis comprises a stack having at least one anode layer arranged adjacent to an anode collector layer, at least one cathode layer arranged adjacent to a cathode collector layer, and at least one solid electrolyte layer arranged between the anode layer and the cathode layer,
wherein at least one of the electrochemical solid-state cells comprises an elastically deformable compensation element which at least partly compensates a change in volume along the longitudinal axis of the stacked electrochemical solid-state cells,
wherein the elastically deformable compensation element has a modulus of elasticity of at most 100 kN/mm 2 and the elastically deformable compensation element is ion-conducting, and
wherein the elastically deformable compensation element of at least one electrochemical solid-state cell along the longitudinal axis is in a compressed state relative to a noncompressed state of the solid-state cell stack if it were not within the housing, and wherein the elastically deformable compensation element of the at least one electrochemical solid-state cell in the compressed state along the longitudinal axis has a layer thickness of 10 μm to 90 μm.

2. The galvanic element according to claim 1 , wherein the elastically deformable compensation element of the at least one electrochemical solid-state cell is of layer like design.

3. The galvanic element according to claim 1 , wherein the elastically deformable compensation element is designed as an additional layer of the stack of the at least one electrochemical solid-state cell.

4. The galvanic element according to claim 1 , wherein the elastically deformable compensation element is designed as solid electrolyte layer of the at least one electrochemical solid-state cell.

5. The galvanic element according to claim 1 , wherein the elastically deformable compensation element is arranged on at least one side surface of the stack along the longitudinal axis of the at least one electrochemical solid-state cell, and wherein the side surface is one of the four sides of the stack that connect two opposite major surfaces of the stack to one another.

6. The galvanic element according to claim 1 , wherein the elastically deformable compensation element has a modulus of elasticity which is smaller than the modulus of elasticity of the other layers of the stack.

7. The galvanic element according to claim 1 , wherein the elastically deformable compensation element has a modulus of elasticity of at most 30 kN/mm 2 .

8. The galvanic element according to claim 1 , wherein the elastically deformable compensation element has a modulus of elasticity of at most 15 kN/mm 2 .

9. The galvanic element according to claim 1 , wherein the elastically deformable compensation element has a modulus of elasticity of at most 1 kN/mm 2 .

10. The galvanic element according to claim 1 , wherein the elastically deformable compensation element of the at least one electrochemical solid-state cell comprises an elastomer.

11. The galvanic element according to claim 1 , wherein the housing, for accommodating the solid-state cell stack, is embodied with an interior which in the direction of the longitudinal axis has a smaller dimension than a corresponding dimension of the solid-state cell stack would have if it were not within the housing.

12. The galvanic element according to claim 1 , wherein the elastically deformable compensation element of the at least one electrochemical solid-state cell in the compressed state along the longitudinal axis has a layer thickness of 20 μm to 70 μm.

13. The galvanic element according to claim 1 , wherein the elastically deformable compensation element of the at least one electrochemical solid-state cell in the compressed state along the longitudinal axis has a layer thickness of 30 μm to 50 μm.

14. The galvanic element according to claim 1 , wherein a layer thickness of the elastically deformable compensation element in the compressed state relative to a layer thickness of the elastically deformable compensation element in the noncompressed state along the longitudinal axis is compressed by at least 5%.

15. The galvanic element according to claim 1 , wherein a layer thickness of the elastically deformable compensation element in the compressed state relative to a layer thickness of the elastically deformable compensation element in the noncompressed state along the longitudinal axis is compressed by at least 15%.

16. The galvanic element according to claim 1 , wherein a layer thickness of the elastically deformable compensation element in the compressed state relative to a layer thickness of the elastically deformable compensation element in the noncompressed state along the longitudinal axis is compressed by at least 20%.

17. The galvanic element according to claim 1 , wherein the solid-state cell stack comprises at least 30 electrochemical solid-state cells and comprises the elastically deformable compensation element in a ratio of at least one of 30 of the electrochemical solid-state cells.

18. The galvanic element according to claim 1 , wherein the electrochemical solid-state cells are configured as lithium ion cells.

19. The galvanic element according to claim 1 , wherein the elastically deformable compensation element is designed for at least partial compensation of a change in volume of the anode layer during a charge/discharge operation.

20. A method for producing the galvanic element of claim 1 , comprising the following steps:
providing the solid-state cell stack; and
compressing the solid-state cell stack along the longitudinal axis and transferring the solid-state cell stack into the housing.

21. A vehicle having the galvanic element according to claim 1 .

22. A mobile device having the galvanic element according to claim 1 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Lupart Saskia
• Paschos Odysseas
• Lamp Peter

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/0481

  Compression means other than compression means for stacks of electrodes and separators · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title