Abstract: In a power supply system, a control device is configured to adjust a state of charge of each of an alternating-current battery string and a direct-current battery string by power transfer between the alternating-current battery string and the direct-current battery string before performing requested energy management.

Abstract: A power supply system comprises an alternating-current sweep unit that outputs alternating-current power from a U-phase battery string, a V-phase battery string, and a W-phase battery string that are Y-connected, a first power supply circuit that converts output of a direct-current sweep unit to alternating-current power using an inverter and outputs the alternating-current power, the direct-current sweep unit including a first battery string; and a control device. An energy density of a battery included in the U-phase battery string, the V-phase battery string, and the W-phase battery string is higher than an energy density of a battery included in the first battery string.

Abstract: A power supply system includes an alternating current sweep unit and a first power supply circuit, and each of a first U-phase battery string, a first V-phase battery string, a first W-phase battery string, and a first battery string includes a plurality of battery circuit modules connected in series, and each of the battery circuit modules includes a battery, output terminals, a first switch, and a second switch.

Abstract: An electric power supply system includes an alternating current electric power supply circuit that converts direct current electric power of a first direct current sweep unit including a battery string into alternating current electric power using a first inverter and outputs it, and an alternating current sweep unit that includes a U-phase battery string, a V-phase battery string, and a W-phase battery string that are Y-connected. Output densities of batteries of the battery string are higher than output densities of batteries of the alternating current sweep unit. Alternating current electric power is output from the alternating current sweep unit and the alternating current electric power supply circuit, and after a predetermined period elapses, the output of the alternating current electric power from the alternating current electric power supply circuit is stopped.

Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.

Abstract: A vehicle includes a battery that is mounted as a power source in the vehicle and an instrument panel that displays, to a user of the vehicle, an index (a capacity retention ratio Q or an electric vehicle (EV) travelable distance) indicating a larger value as deterioration of the battery progresses less. The instrument panel displays a maximum value of the index until a predetermined condition has been satisfied.

Abstract: A power supply system includes a plurality of sweep modules, a defect detecting unit, and a control unit. Each sweep module includes a battery module and a power circuit module. The defect detecting unit detects a defect for each sweep module. The number of sweep modules is greater S (S?2) than a minimum number of sweep modules required for operation. When the number of defective sweep modules in which a defect has been detected is equal to or less than F (2?F?S), the control unit is configured to disconnect the defective sweep modules from a main line and to continuously execute sweep control.

Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.

Abstract: Provided is a power supply device which includes a plurality of battery modules and in which the battery modules are connected in series with one another in accordance with a gate driving signal from a controller. The power supply device includes a disconnecting part configured to forcibly isolate the battery module from a series connection regardless of the gate driving signal, and limits, in accordance with a target output voltage value, a number of the battery modules to be forcibly isolated by the disconnecting part.

Abstract: A battery cellar includes: battery groups each including a plurality of batteries; a power converter (AC/DC converter and DC/DC converter) electrically connected between the plurality of batteries and an electric power system, the power converter being capable of bidirectional power conversion; and a server that controls operation of the power converter in accordance with a DR request from the electric power system, to cause charging and discharging of a plurality of batteries. The server suppresses charging and discharging of batteries of a rank representing a smaller degree of battery degradation, relative to charging and discharging of batteries of a rank representing a greater degree of battery degradation. Proper inventory of batteries of a higher rank can thus be ensured.

Abstract: The battery cellar includes a storage cabinet that stores a plurality of used batteries, a power converter (an AC/DC converter and a DC/DC converter) electrically connected between the plurality of used batteries stored in the storage cabinet and a power system, and a server that controls the power converter to charge or discharge the plurality of batteries in response to a demand response request from the power system. The server selects, from the plurality of used batteries, a first battery, the degradation degree of which has reached a reference value, and a second battery, the degradation degree of which does not reach the reference value but is predicted to reach the reference value within a predetermined period, as replacement target batteries.

Abstract: The battery cellar includes a storage cabinet that stores a plurality of batteries, an AC/DC converter and a DC/DC converter electrically connected between the plurality of used batteries stored in the storage cabinet and a power system, and a server that controls the AC/DC converter and the DC/DC converter. The server controls the AC/DC converter and the DC/DC converter in response to a demand response request from the power system, and evaluates a degradation degree of each of the plurality of used batteries based on a voltage and a current of each of the plurality of used batteries charged or discharged by the AC/DC converter and the DC/DC converter.

Abstract: The battery cellar includes a storage cabinet that stores a plurality of batteries, a power converter (an AC/DC converter and a DC/DC converter) electrically connected between the plurality of batteries stored in the storage cabinet and a power system to perform a bidirectional power conversion operation, and a server that controls the power converter to charge or discharge the plurality of batteries in response to a DR request from the power system. The server, based on a level of demand determined in accordance with a rank related to a degradation degree of a battery, suppresses the charging/discharging of a battery with a higher demand rank among the plurality of batteries as compared with the charging/discharging of a battery with a lower demand rank among the plurality of batteries.

Abstract: A battery cellar includes: battery groups each including a plurality of batteries; a power converter (AC/DC converter and DC/DC converter) electrically connected between the plurality of batteries and an electric power system; and a server that controls operation of the power converter in accordance with a DR request from the electric power system, to cause charging and discharging of the plurality of batteries. The battery groups include a low operating group and a high operating group that is less than or equal to the low operating group in terms of the number of types of ranks of batteries included in each battery group, where the ranks each represent a degree of battery degradation. The server suppresses charging and discharging of the plurality of batteries included in the low operating group, relative to charging and discharging of the plurality of batteries included in the high operating group.

Abstract: A display device includes: a display unit configured to display an index corresponding to a deterioration state of a secondary battery and an EV travelable distance; and a control unit configured to control display of the display unit such that a first decreasing amount by which the EV travelable distance displayed on the display unit decreases with the elapse of time until a predetermined condition has been satisfied is less than a second decreasing amount by which the EV travelable distance displayed on the display unit decreases with the elapse of time after the predetermined condition has been satisfied.

Abstract: A power supply system includes a power supply circuit that includes a plurality of battery modules, each of which has a battery. The power supply circuit is configured such that the batteries in the battery modules are connected to each other in series in response to a gate driving signal from a controller. An alternating current voltage having a different phase is output by temporally changing the number of the batteries connected in series in each of a plurality of power supply circuits.

Abstract: There is provided a power supply device including a plurality of battery modules, the battery modules being connected in series with one another according to a gate driving signal from a controller, the power supply device transmitting the gate driving signal from upstream of the series connection toward downstream of the series connection after the gate driving signal is delayed at delay circuits included in the respective battery modules, and returning the gate driving signal to the controller from a most downstream battery module, wherein the power supply device performs malfunction determination of the delay circuits based on a time difference from a transmission time of a signal from the controller to a reception time of the signal.

Abstract: A power supply system includes a plurality of sweep modules that is connected to a main line. Each sweep module includes a switching element that switches between connection and disconnection between a battery module and the main line and is formed of a MOSFET. A failure detecting device of the power supply system includes a temperature detecting unit configured to detect temperatures of the plurality of sweep modules and a failure determining unit configured to determine whether a difference between a temperature of one sweep module selected from the plurality of sweep modules and a reference temperature which is determined based on the temperatures of other sweep modules is greater than a predetermined threshold value.

Abstract: A vehicle includes a secondary battery and a display device. The secondary battery is mounted on the vehicle as a power source. The display device is configured to display an indicator that indicates a capacity retention rate of the secondary battery at a current point in time. The capacity retention rate is a ratio of a capacity of the secondary battery at the current point in time to a reference capacity of the secondary battery. The reference capacity is set in advance based on a virtual capacity of the secondary battery after a lapse of a predetermined period from manufacture of the vehicle.

Abstract: An analysis device determines, by the Maharanobis-Taguchi system using a plurality of explanatory variables, to which of a first group and a second group a module representing a nickel metal hydride battery will belong when the module is subjected to capacity restoration processing, the first group being defined as a group of modules of which battery capacity is lower than a reference capacity, the second group being defined as a group of modules of which battery capacity is higher than a reference capacity. The plurality of explanatory variables include a plurality of feature values extracted from a Nyquist plot of the module. The plurality of feature values include at least two AC impedance real number components plotted in a semicircular portion, at least two AC impedance imaginary number components plotted in the semicircular portion, and at least one AC impedance imaginary number component plotted in a linear portion.