All-solid-state battery and method for producing all-solid-state battery

Patent metadata

Field	Value
Publication number	US-10651456-B2
Application number	US-201815935687-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Apr 7, 2017
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

In an all-solid-state battery including at least one short-circuit current shunt part and at least one electric element which are stacked, when the battery is constrained, cracking etc. of the adhesive in the short-circuit current shunt pail is prevented.
The all-solid-state battery includes at least one short-circuit current shunt part and at least one electric element which are stacked, to the all-solid-state battery constraint pressure being applied by a constraining member in a direction of stacking the short-circuit current shunt part and the electric element, wherein the short-circuit current shunt part includes a first current collector layer, a second current collector layer, and an insulating layer provided between the first and second current collector layers, all of these layers being stacked along the direction, to be adhered to each other with adhesive, the electric element includes a cathode current collector layer, a cathode material layer, a solid electrolyte layer, an anode material layer, and an anode current collector layer, all of these layers being stacked along the direction, the first current collector layer is electrically connected with the cathode current collector layer, the second current collector layer is electrically connected with the anode current collector layer, and the adhesive is provided for a zone in the short-circuit current shunt part, to the zone the constraint pressure from the constraining member not being applied.

First claim

What is claimed is:

1. An all-solid-state battery comprising at least one short-circuit current shunt part and at least one electric element which are stacked, to the all-solid-state battery constraint pressure being applied by a constraining member in a direction of stacking the short-circuit current shunt part and the electric element, wherein
the short-circuit current shunt part comprises a first current collector layer, a second current collector layer, and an insulating layer provided between the first and second current collector layers, all of these layers being stacked along the direction, to be adhered to each other with adhesive,
the electric element comprises a cathode current collector layer, a cathode material layer, a solid electrolyte layer, an anode material layer, and an anode current collector layer, all of these layers being stacked along the direction,
the first current collector layer is electrically connected with the cathode current collector layer,
the second current collector layer is electrically connected with the anode current collector layer, and
the adhesive is provided for a zone in the short-circuit current shunt part to which the constraint pressure from the constraining member is not applied.

2. The all-solid-state battery according to claim 1 , wherein
the adhesive is provided outside the cathode material layer, the solid electrolyte layer, and the anode material layer in a view in the direction.

3. The all-solid-state battery according to claim 1 , wherein
each of the first and second current collector layers includes a current collector tab, and the adhesive is provided for the current collector tab.

4. The all-solid-state battery according to claim 3 , wherein
in the view in the direction,
an area of the first current collector layer excluding the current collector tab is smaller than that of the insulating layer,
an area of the second current collector layer excluding the current collector tab is smaller than that of the insulating layer, and
the adhesive is provided for a zone in the insulating layer, the zone protruding to an outside of outer edges of the first and second current collector layers.

5. The all-solid-state battery according to claim 1 , wherein the adhesive has a linear shape.

6. The all-solid-state battery according to claim 1 , wherein
the short-circuit current shunt part has five-layer structure of the first current collector layer, the insulating layer, the second current collector layer, the insulating layer, and the first current collector layer, all of the layers being stacked in this order.

7. The all-solid-state battery according to claim 1 , wherein
said at least one short-circuit current shunt part and a plurality of the electric elements are stacked, and the electric elements are electrically connected in parallel.

8. A method for producing an all-solid-state battery, the method comprising:
a first step of stacking a first current collector layer, an insulating layer, and a second current collector layer, and adhering them to each other with adhesive, to make at least one short-circuit current shunt part;
a second step of stacking a cathode current collector layer, a cathode material layer, a solid electrolyte layer, an anode material layer, and an anode current collector layer, to make at least one electric element;
a third step of stacking the short-circuit current shunt part and the electric element along a direction of stacking the layers; and
a fourth step of constraining the short-circuit current shunt part and the electric element, which are stacked, by a constraining member, and at the same time applying constraint pressure along the direction, wherein
a position where the adhesive is provided for the short-circuit current shunt part is determined in the first step so that the adhesive is arranged in a zone to which the constraint pressure from the constraining member is not applied in the fourth step.

9. The method according to claim 8 , wherein
the position of the adhesive in the short-circuit current shunt part is determined in the first step so that the adhesive is provided outside the cathode material layer, the solid electrolyte layer, and the anode material layer in a view in the direction.

10. The method according to claim 8 , wherein
each of the first and second current collector layers includes a current collector tab, and
in the first step, the current collector tab is adhered to the insulating layer with the adhesive.

11. The method according to claim 10 , wherein
in the view in the direction,
an area of the first current collector layer excluding the current collector tab is smaller than that of the insulating layer,
an area of the second current collector layer excluding the current collector tab is smaller than that of the insulating layer, and
in the first step, the adhesive is provided in a zone in the insulating layer, the zone protruding to an outside of outer edges of the first and second current collector layers.

12. The method according to claim 8 , wherein the adhesive has a linear shape.

13. The method according to claim 8 , wherein
in the first step, the first current collector layer, the insulating layer, the second current collector layer, the insulating layer, and the first current collector layer are stacked in this order.

14. The method according to claim 8 , wherein
said at least one short-circuit current shunt part and a plurality of the electric elements are stacked, and electrically connected, and the electric elements are electrically connected in parallel.

15. The method according to claim 8 , wherein the first step further comprises:
linearly providing the adhesive at part of one face, and at part of another face of the insulating layer along a longitudinal direction of the insulating layer, the insulating layer being belt-shaped;
cutting the insulating layer, for which the adhesive is provided, into a plurality of rectangles; and
stacking the first current collector layer onto the face of the insulating layer, for which the adhesive is provided, via the adhesive, to adhere the first current collector layer to the face with the adhesive, and stacking the second current collector layer onto the other face of the insulating layer, for which the adhesive is provided, via the adhesive, to adhere the second current collector layer to the other face with the adhesive,
to make the short-circuit current shunt part.

16. The all-solid-state battery according to claim 1 , wherein
the constraining member applies the constraint pressure to a center of the short-circuit current shunt part, the center being in a direction perpendicular to the direction of stacking, and
the zone in the short-circuit current shunt part, for which the adhesive is provided, is at an outer side of the short-circuit current shunt part in the direction perpendicular to the direction of stacking.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hasegawa Hajime
• Matsushita Yuki
• Tateishi Mitsuru
• Nishimura Hideaki
• Ebisuzaki Hideyo
• Okuhata Yusuke
• Ose Norihiro
• Hama Shigenori

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2220/20

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

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title