Toyota Patent Granted for All-Solid-State Battery Production Method

ChangeBridge: Patent Grants - Batteries (H01M)

Published March 24th, 2026

Detected March 26th, 2026

Summary

The USPTO has granted Toyota a patent for a method to produce all-solid-state batteries. The method aims to prevent short circuits by controlling the behavior of active material particles during the pressing of battery components. This patent is for a specific manufacturing process.

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What changed

The United States Patent and Trademark Office (USPTO) has granted Toyota Jidosha Kabushiki Kaisha patent US12586812B2 for a method of producing all-solid-state batteries. The patented method focuses on preventing short circuits between the cathode and anode by managing the crushing of secondary active material particles into primary particles at the interface between the active material layer and the solid electrolyte layer during the pressing stage of battery component assembly. The patent was filed on December 23, 2021, and granted on March 24, 2026.

This is a patent grant, not a regulatory rule or enforcement action. Therefore, it does not impose new compliance obligations on regulated entities. However, companies involved in battery manufacturing, particularly those developing solid-state battery technology, may wish to review the patent to understand the scope of Toyota's intellectual property in this area. The patent does not specify a compliance deadline or penalties, as it pertains to intellectual property rights rather than regulatory mandates.

Source document (simplified)

← USPTO Patent Grants

Method for producing all solid-state battery, and all solid-state battery

Grant US12586812B2 Kind: B2 Mar 24, 2026

Assignee

TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventors

Motoshi Isono, Norihiro Ose, Tomoya Suzuki

Abstract

It is suppressed that an active material particle enters into or penetrates through a solid electrolyte layer when an active material layer and the solid electrolyte layer are pressed and that short circuits between a cathode and an anode occur. A method for producing an all solid-state battery includes: a first step of stacking an active material layer over at least one surface of a solid electrolyte layer to constitute a stack; and a second step of pressing the stack to constitute a compact, wherein in the first step, the active material layer contains a secondary particle of an active material, and in the second step, the secondary particle is crushed to primary particles by said pressing, the secondary particle being present in an interfacial portion between the active material layer and the solid electrolyte layer.

CPC Classifications

H01M 10/0565 H01M 2300/0065 H01M 2300/0085 H01M 4/13 H01M 4/36 H01M 2004/021 H01M 10/0561 H01M 10/0562 H01M 2300/0068 H01M 4/139 H01M 10/0427 H01M 10/0585 H01M 10/0587 H01M 2004/028