A diagnostic device diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit.

A diagnostic device diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit.

An electronic component device includes an electronic component, a pair of metal terminals, a bonding member, and an expansion member having thermal expansibility. The electronic component includes an element body and a pair of external electrodes. The element body has a pair of end faces opposed to each other. The pair of external electrodes is disposed on the pair of end faces. The pair of metal terminals is electrically connected to the pair of external electrodes. The bonding member bonds one of the pair of external electrodes to one of the pair of metal terminals. The bonding member electrically connects the one of the pair of external electrodes to the one of the pair of metal terminals. The one of the pair of metal terminals includes an opposing face. The opposing face is a flat face.

An electronic component includes a body, a pair of external electrodes, disposed on both ends of the body in a first direction, respectively, containing at least one of copper and nickel, while not containing a noble metal, a pair of metal frames connected to the pair of external electrodes, respectively, and a pair of conductive bonding layers, disposed between the external electrode and the metal frame, respectively, containing the same metal component as the external electrode.

A capacitor provides a plurality of selectable capacitance values, by selective connection of six capacitor sections of a capacitive element each having a capacitance value. The capacitor sections are provided in a plurality of wound cylindrical capacitive elements. Two vertically stacked wound cylindrical capacitance elements may each provide three capacitor sections. There may be six separately wound cylindrical capacitive elements each providing a capacitor section. The capacitor sections have a common element terminal.

A capacitor provides a plurality of selectable capacitance values, by selective connection of six capacitor sections of a capacitive element each having a capacitance value. The capacitor sections are provided in a plurality of wound cylindrical capacitive elements. Two vertically stacked wound cylindrical capacitance elements may each provide three capacitor sections. There may be six separately wound cylindrical capacitive elements each providing a capacitor section. The capacitor sections have a common element terminal.

A diagnostic device and method diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit. The damage to the breaker can also be diagnosed on a basis of a short-circuit current during a first time from detection to interruption of a short circuit, and a short-circuit current during a second time from the interruption to convergence of the short-circuit current. An energy storage apparatus can include the diagnostic device.

A diagnostic device and method diagnoses damage to a breaker that interrupts a current of an energy storage device. The damage to the breaker is diagnosed on the basis of a short-circuit current at a time of an external short circuit. The damage to the breaker can also be diagnosed on a basis of a short-circuit current during a first time from detection to interruption of a short circuit, and a short-circuit current during a second time from the interruption to convergence of the short-circuit current. An energy storage apparatus can include the diagnostic device.

A pressure protector for a high-voltage self-healing capacitor. is composed of a box shell, a cover plate, a core, filled resin, a pressure protector and wiring terminals. The pressure protector is arranged in the capacitor, and the pressure protector is mainly composed of fixed studs, a protector shell, a movable bolt assembly, a fixed electrode assembly, a movable electrode assembly, first fixed bolts and a limiting bolt. The pressure protector for a high-voltage self-healing capacitor is simple in structure and convenient to install and use, the technical problem of relay protection of internal faults of the self-healing capacitor can be solved. Accidents can be effectively avoided, and the requirement for safe operation of the capacitor can be met.

A current interruption device includes a conductive plate and a first deformable plate. The conductive plate includes a center portion and a peripheral portion surrounding the center portion. An upper surface of the center portion is formed in a planar shape spreading in a first direction and a second direction orthogonal thereto in a conductive state. The peripheral portion includes an inclined portion extending outward from a boundary between the center portion and the peripheral portion. An upper surface of the inclined portion is inclined so as to increase a distance to the first deformable plate as the upper surface of the inclined portion becomes farther away from the center portion when the conductive plate and the first deformable plate are viewed along the first direction or the second direction in the conductive state.