Abstract: A battery system comprises a plurality of battery modules, each of the battery modules includes an assembled battery configured to include a plurality of battery cells connected in series, a monitoring unit configured to monitor the assembled battery, and an external member configured to be electrically connected to the monitoring unit, and the monitoring unit of each of the battery modules has a generation unit configured to generate, based on an electric signal input from the external member, an identification information item on the corresponding one of the battery modules, the identification information items of the respective battery modules being different from one another.

Abstract: A powder magnetic core capable of achieving a low loss in a high frequency range is provided. A powder magnetic core according to the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. A volume filling percentage of the magnetic powder included in the powder magnetic core is 85 volume % or higher, and a value obtained by dividing a BET specific surface area (m2/g) of the powder magnetic core by a specific surface area (m2/g) calculated using outer dimensions of the powder magnetic core is 5000 or less.

Abstract: A powder magnetic core according to an aspect of the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. The powder magnetic core contains 88 volume % or more of magnetic powder, and when a cross-sectional photograph of the powder magnetic core is taken, an area of the cross-sectional photograph having a size of 10000 ?m2 is divided into unit areas, one or more of the unit areas in which the size of a cross-sectional area of a binder accounts for 50% or more of the unit area are extracted as specific unit areas, and the percentage of the number of specific unit areas with respect to the total number of unit areas is equal to or larger than 0.2% but equal to or smaller than 3.0%.

Abstract: A dust core is manufactured by compacting magnetic particles in a metal die while heating the magnetic particles at a predetermined temperature in the metal die. At least some of the magnetic particles are coated with coating material. The metal die comprises a die, an upper punch and a lower punch. The upper punch is positioned above the lower punch in an up-down direction. The metal die is provided with a low-temperature portion and a high-temperature portion. A temperature of the low-temperature portion is less than a temperature of the high-temperature portion by 10° C. or more.

Abstract: Alloy powder includes particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed, the divided trace being a mark at which molten alloy is divided; and the divided trace has at least a hill-like ridge aggregate structure or a combination of a crater structure and the hill-like ridge aggregate structure, the hill-like ridge aggregate structure being an aggregate of a plurality of hill-like ridges.

Abstract: Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.

Abstract: To provide a dust core with good direct current superimposition characteristics and an inductor using such a dust core. A dust core according to an aspect of the present disclosure includes magnetic powder particles that are bound together through a binder layer, in which when a magnetic permeability in a state where a magnetic flux density generated by a direct current is 0 T is represented by ?B=0 T and a magnetic permeability in a state where the magnetic flux density generated by a direct current is 0.5 T is represented by ?B=0.5 T, a value expressed by ?B=0.5 T/?B=0 T is 0.65 or higher.

Abstract: Alloy powder comprises particles. The particles include specific particles. Each of the specific particles has a surface layer on which a divided trace is formed.

Abstract: A powder magnetic core capable of achieving a low loss in a high frequency range while reducing the size thereof is provided. A powder magnetic core according to the present disclosure is a powder magnetic core in which a magnetic powder is bonded via a binder layer. The powder magnetic core contains 88 volume % or more of magnetic powder, and the percentage of parts of the binder layer having thicknesses of 20 nm or smaller in the binder layer that is present between particles of the magnetic powder is equal to or smaller than 6% (not including 0%).