Hitachi had 88 patents in batteries during Q4 2023. Hitachi Ltd filed patents in Q4 2023 for innovations related to all-solid-state secondary batteries, relay control devices for vehicles, positive electrodes for non-aqueous electrolyte secondary batteries, and a control technique for connecting storage batteries to a DC bus. These inventions aim to improve battery performance, efficiency, and control in various applications. GlobalData’s report on Hitachi gives a 360-degreee view of the company including its patenting strategy. Buy the report here.

Hitachi grant share with batteries as a theme is 42% in Q4 2023. Grant share is based on the ratio of number of grants to total number of patents.

Recent Patents

Application: Negative electrode for all-solid-state secondary battery, and all-solid-state secondary battery (Patent ID: US20230420673A1)

The patent filed by Hitachi Ltd. describes a negative electrode for an all-solid-state secondary battery that includes a molded body made of a negative-electrode mixture containing a solid electrolyte and a negative-electrode material with a carbon material as the negative-electrode active material. The solid electrolyte is an argyrodite-type sulfide-based material, and the negative electrode has specific A/B values ranging from 0.1 to 0.8, indicating the percentage of carbon material in different areas of the molded body.

Furthermore, the patent claims detail specific variations of the negative electrode, such as different A/B value ranges, the use of hard carbon or graphite as the negative-electrode active material, the formation of a solid electrolyte layer on the surface of the negative-electrode material, and limitations on the content of binder in the molded body. The patent also extends to an all-solid-state secondary battery that includes the described negative electrode, along with a positive electrode and a solid electrolyte layer, emphasizing the importance of the negative electrode's composition and structure in the overall battery design.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.