US-20260128392-A1 - SOLID STATE BATTERY AND VEHICLE

Abstract

A solid state battery includes: a plurality of cells each including a plurality of electrode bodies, the plurality of electrode bodies each including a positive electrode having a plate shape, a negative electrode having the plate shape, and a solid electrolyte layer formed between the positive electrode and the negative electrode, the plurality of electrode bodies being integrated together with a coating agent in a state in which a plurality of linear edges are aligned with each other, a position of an end surface of the coating agent being aligned in a direction perpendicular to a plane including the plurality of linear edges.

Inventors

• Akihiro Taguchi
• Takayuki Yamamoto
• Atsushi ASAHI
• Kazuya Matsuoka
• Masahiro HOKAZONO
• Kenji Tsukahara
• Fumikazu Nakazawa

Assignees

• HONDA MOTOR CO., LTD.

Dates

Publication Date

20260507

Application Date

20251029

Priority Date

20241105

Claims (6)

1. 1 . A solid state battery comprising: a plurality of cells each including a plurality of electrode bodies, the plurality of electrode bodies each including a positive electrode having a plate shape, a negative electrode having the plate shape, and a solid electrolyte layer formed between the positive electrode and the negative electrode, the plurality of electrode bodies being integrated together with a coating agent in a state in which a plurality of linear edges are aligned with each other, a position of an end surface of the coating agent being aligned in a direction perpendicular to a plane including the plurality of linear edges.
2. 2 . The solid state battery according to claim 1 , wherein the coating agent and the plurality of electrode bodies are covered with an exterior formed by lamination processing.
3. 3 . The solid state battery according to claim 1 , further comprising: a cushion sandwiched between the cells; an end plate sandwiching the cell and the cushion in a direction perpendicular to a broadest surface of one of the positive electrode, the negative electrode, or the solid electrolyte layer; and a bind bar sandwiching the plurality of cells in a direction parallel to the broadest surface of one of the positive electrode, the negative electrode, or the solid electrolyte layer.
4. 4 . The solid state battery according to claim 1 , wherein the coating agent is either an acrylic resin or an epoxy resin.
5. 5 . The solid state battery according to claim 1 , wherein the coating agent has a Young's modulus equal to or smaller than 40 MPa at a temperature equal to or higher than 0 degrees and equal to or lower than 40 degrees after being cured.
6. 6 . A vehicle comprising the solid state battery according to claim 1 mounted with the end surface facing a road surface.

Description

BACKGROUND Technical Field The present invention relates to a solid state battery and a vehicle. Related Art In recent years, research and development on secondary batteries that contribute to energy efficiency are conducted so that more people are able to access affordable, reliable, sustainable, and advanced energy. Secondary batteries are indispensable for vehicles such as electric vehicles. As a document that discloses a technique related to a secondary battery, for example, Japanese Patent Publication No. 2016-157520 can be mentioned. The secondary battery manufactured by the manufacturing apparatus disclosed in Japanese Patent Publication No. 2016-157520 is manufactured by arranging fuel battery cells in a state of being suspended from an alignment guide rail. CITATION LIST Patent Literature Patent Literature 1: Japanese Patent Publication No. 2016-157520 SUMMARY In the secondary battery manufactured by the manufacturing apparatus disclosed in Japanese Patent Publication No. 2016-157520, by the way, if the dimensions of the respective parts of a fuel battery cell vary, the edges of the respective part may not be aligned with each other. In such a case, external force is intensively applied to the edge that projects further than the other edges, and the secondary battery may be damaged. In addition, in a case where the secondary battery is mounted on a vehicle such as an electric vehicle, the secondary battery may receive the external force due to a collision with a curbstone or a collision of a stone that has bounced while the vehicle is traveling. The present invention has been made to solve the above problems, and it is an object of the present invention to provide a solid state battery and a vehicle, by which a possibility of being damaged by external force can be reduced when mounted on a vehicle such as an electric vehicle. In addition, the present invention contributes to safety, accordingly. In order to achieve the above object, a solid state battery according to a first aspect, includes: a plurality of cells each including a plurality of electrode bodies, the plurality of electrode bodies each including a positive electrode having a plate shape, a negative electrode having the plate shape, and a solid electrolyte layer formed between the positive electrode and the negative electrode, the plurality of electrode bodies being integrated together with a coating agent in a state in which a plurality of linear edges are aligned with each other, a position of an end surface of the coating agent being aligned in a direction perpendicular to a plane including the plurality of linear edges. This enables the solid state battery according to the first aspect to be disposed with the end surface of the coating agent facing a direction having high frequency of receiving the external force due to a collision of a curbstone, a stone that has bounced while the vehicle is traveling, or the like. Therefore, unlike a solid state battery in which edges of the electrode bodies or the end surface of the coating agent of the cell are not aligned, the solid state battery according to the first aspect is capable of receiving external force on a surface, so that the possibility of being damaged by the external force can be reduced. In addition, the solid state battery according to the first aspect is capable of avoiding an increase in manufacturing cost due to provision of a separate member in order to ensure the strength against the external force. In the solid state battery according to a second aspect, the coating agent and the plurality of electrode bodies may be covered with an exterior formed by lamination processing. Accordingly, in the solid state battery according to the second aspect, it becomes possible to suppress movements of the coating agent and the plurality of electrode bodies, and to align the position of the end surface of the coating agent, so that the structure of a part where the external force is not excessively concentrated on a specific position can be more reliably maintained. The solid state battery according to a third aspect may further include: a cushion sandwiched between the cells; an end plate sandwiching the cell and the cushion in a direction perpendicular to a broadest surface of one of the positive electrode, the negative electrode, or the solid electrolyte layer; and a bind bar sandwiching the plurality of cells in a direction parallel to the broadest surface of one of the positive electrode, the negative electrode, or the solid electrolyte layer. Accordingly, in the solid state battery according to the third aspect, the position of the end surface of the coating agent is aligned, so that the cells can be held firmly, while the external force is prevented from being directly applied to the plurality of cells, which are disposed in a state in which the external force is not excessively concentrated on a specific position. Therefore, in the solid state battery according to the third as