Solid-state battery and method of manufacturing solid-state battery

Patent metadata

Field	Value
Publication number	US-12500234-B2
Application number	US-202217664223-A
Country	US
Kind code	B2
Filing date	May 20, 2022
Priority date	May 25, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

Provided is a solid-state battery having a bipolar electrode plate and capable of reducing the lamination space factor of a solid electrolyte and reducing electrical resistivity. The solid-state battery includes: a laminate including a positive electrode plate, at least one bipolar electrode plate, and a negative electrode plate that are laminated; and a solid electrolyte layer formed on a lamination surface of the at least bipolar electrode plate.

First claim

What is claimed is:

1 . A solid-state battery comprising:
a laminate including a positive electrode plate, a plurality of bipolar electrode plates, and a negative electrode plate that are laminated; and a solid electrolyte layer formed on a lamination surface of each of the plurality of bipolar electrode plates, wherein each of the plurality of bipolar electrode plates has, on an end face thereof as viewed from a lamination surface side, a concave portion on which the solid electrolyte layer is formed and a convex portion on which the solid electrolyte layer is not formed, the concave portion and the convex portion being alternately formed, adjacent ones of the plurality of bipolar electrode plates have shapes that are mutually in a mirror-image relation, and the concave portion and the convex portion are arranged to be staggered between adjacent ones of the plurality of bipolar electrode plates.

2 . The solid-state battery according to claim 1 , wherein
the solid electrolyte layer is formed on at least a part of the end face of each of the plurality of bipolar electrode plates.

3 . The solid-state battery according to claim 1 , wherein
the concave portion of one of the plurality of bipolar electrode plates that is arranged adjacent to the positive electrode plate or the negative electrode plate is arranged at a position corresponding to an electrode tab extending from the positive electrode plate or the negative electrode plate and is larger in width than the electrode tab.

4 . The solid-state battery according to claim 1 , wherein
the solid electrolyte layer is formed on a lamination surface of the positive electrode plate and a lamination surface of the negative electrode plate.

5 . A method of manufacturing a solid-state battery, the method including a bipolar electrode plate producing process for producing the bipolar electrode plates according to claim 1 ,
the bipolar electrode plate producing process comprising, in sequence: an electrode material coating step of coating one surface of a current collecting plate with a positive electrode material and coating the other surface of the current collecting plate with a negative electrode material; a perforating step of forming a hole in a part of the current collecting plate coated with the positive and negative electrode materials; a solid electrolyte coating step of coating, with a solid electrolyte, the current collecting plate coated with the positive and negative electrode materials; and a cutting step of cutting the current collecting plate coated with the positive and negative electrode materials along a cutting line extending across the hole so that a concave portion is formed at an edge of the current collecting plate.

6 . The method of manufacturing a solid-state battery according to claim 5 , wherein
in the bipolar electrode plate producing process, the perforating step includes forming the hole comprising a plurality of holes in rows such that the holes in adjacent ones of the rows are staggered, thereby producing the bipolar electrode plates having two types of shapes that are mutually in a mirror-image relation.

Assignees

• Honda Motor Co Ltd

Inventors

• Akutsu Shigemitsu
• Fujimoto Shinji
• Sukigara Toru

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/029

  Bipolar electrodes · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M2300/0065

  Solid electrolytes · CPC title