Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Kohei Koyamada

Masafumi Nose

Kenji Yamamoto

Mikihiro Kataoka

Nobuaki Mizutani

Toru Yamamoto

Kotaro Horiai

A secondary battery system and a secondary battery control method, wherein the system and the method include a plurality of unit cells connected in series, and a recovery charging controller that performs recovery charging of charging the plurality of unit cells while generating a micro short-circuit in at least one of the plurality of unit cells by charging the plurality of unit cells at a predetermined recovery charging current value which is higher than a upper limit current value during normal charging, wherein the unit cells are all-solid-state lithium secondary battery unit cells.

Secondary battery system and secondary battery control method

An electrode catalyst for fuel cells that can inhibit an increase in gas diffusion resistance includes a carbon material having a ratio of a peak intensity Iderived from an amorphous structure to a peak intensity Iderived from a graphite structure in an X-ray diffraction spectrum (ratio I/I) of 0.90 or less as a catalyst-supporting carrier.

Electrode catalyst for fuel cells

A method for estimating, under total voltage monitoring, degradation states of individual unit cells connected in series of an all-solid-state lithium secondary battery includes: calculating, at several timings, a state of charge and open circuit voltage of the battery to acquire an actual state of charge-open circuit voltage curve representing the relationship between the state of charge and the open circuit voltage, selecting, from a map of state of charge-open circuit voltage curves, a curve for which a degree of matching with the actual state of charge-open circuit voltage curve is equal to or greater than a predetermined value or is greatest. The map curves are obtained by integrating as many state of charge-open circuit voltage curves of the unit cell corresponding to different degrees of degradation of the unit cell as the number of unit cells, and estimating the individual unit cells degradation states based on the selected curve.

Secondary battery degradation state estimation method, degradation state estimation device, control method, and control system

Growing community of inventors

Susono, Japan

Kohei Koyamada