Abstract: A power supply control device controls charging and discharging of a power supply device including a plurality of power supply units which are connected in parallel to a load and a power generation unit. The power supply control device has relationship information indicating a relationship among a discharge current flowing from the power supply device to the load, a discharge current ratio that is a ratio of output currents of the plurality of power supply units, and a power loss of the power supply device, acquires a measured value of the discharge current, obtains, from the relationship information, the discharge current ratio at which the power loss of the power supply device corresponding to the acquired measured value of the discharge current is minimized, and adjusts the discharge current ratio so as to match with the discharge current ratio obtained from the relationship information.

Abstract: A charging control device is to charge a battery device including a battery group including storage battery systems, in which batteries are connected in series, connected in parallel, system switches and bypass switches. The charging control device includes a control device to control the system switches and the bypass switches to control charging of the battery device.

Abstract: A power storage system includes a plurality of storage battery units connected in series, and a plurality of bypass circuits respectively provided for the storage battery units and each configured to switch the corresponding storage battery unit between a bypass state and a connection state. Each of the storage battery units includes a plurality of storage battery modules connected in series, and each of the storage battery modules includes a plurality of storage battery cells connected in series. The storage battery modules are respectively provided with inter-cell balancing units each configured to execute cell balancing for equalizing voltages of the storage battery cells in the corresponding storage battery module, and the storage battery units are respectively provided with inter-module balancing units each configured to execute module balancing for equalizing voltages of the storage battery modules in the corresponding storage battery unit.

Abstract: A storage battery control device controls a storage battery string including storage batteries connected in series and a bypass circuit configured to switch the storage batteries between a bypass state and a connection state. While causing the bypass circuit to switch the storage batteries between the bypass state and the connection state, a process of charging or discharging the storage batteries is executed to decrease a difference between remaining capacities of the storage batteries until completion of the process. And then, the process is executed while causing the bypass circuit to maintain the storage batteries in the connection state, and when the process is switched from charge to discharge or from discharge to charge, a period where a bypass prevention process of preventing the bypass circuit from switching the storage batteries from the connection state to the bypass state is executed is provided.

Abstract: A storage battery control device controls a power storage system including a plurality of storage battery strings connected in parallel to each other, each of the storage battery strings including a plurality of storage batteries connected in series and a power converter configured to convert an input/output power of the storage battery string. An instruction value of power or current of charge or discharge of the storage batteries string is set, and when the instruction value changes from a current value to a target value, a process of changing the instruction value to the target value by a small amount of change that is less than a difference between the target value and the current value is repeatedly executed until the instruction value reaches the target value.

Abstract: A battery control unit includes a switching unit, a system controller, and a control unit. The switching unit switches between a connection state in which the corresponding battery is discharged and a non-connection state in which the corresponding battery is not discharged. The system controller limits a discharge current flowing through the battery in the connection state so as not to exceed a minimum discharge current limitation value that is smallest among discharge current limitation values. The control unit switches to the non-connection state in order from the battery having the minimum discharge current limitation value before the discharge current limitation unit limits the discharge current. Further, the control unit switches all the batteries to the connection state after the batteries in the connection state becomes one, and then switch the battery to the non-connection state in order from the battery determined to reach a discharge termination state.

Abstract: A storage battery control device constructed of a controller and a driver is provided so as to control a power storage system. The power storage system has storage battery strings including a plurality of power storage batteries connected in series and bypass circuits, power converters configured to convert input and output voltages of the storage battery strings, and a string switch configured to connect or disconnect the storage battery strings and the power converters. The string switch is brought into a disconnected state by the storage battery control device before execution of a bypass operation by the bypass circuits, and is brought into a connected state by the storage battery control device after the execution of the bypass operation by the bypass circuit.

Abstract: A storage battery control device for controlling a power storage system including storage battery modules and a bypass circuit executes a first process of causing the storage battery modules to discharge while switching the storage battery modules caused to be bypassed by the bypass circuit so as to reduce a difference between remaining discharge amounts until discharge completion of the storage battery modules; and a second process of completing the discharge of the storage battery modules after the first process. The first process is executed until an OCV or an SOC of the storage battery modules decreases to be equal to or smaller than a threshold value of the OCV or the SOC set for the storage battery modules. The first process is executed so that available output power of the storage battery module caused to discharge does not fall below minimum necessary power of a power supply destination.

Abstract: A storage battery connection module in which a plurality of storage battery modules are connected in series is provided. The storage battery connection module includes a base plate, a plurality of connection terminals provided on the base plate, a plurality of wire harnesses each connecting the connection terminal to a positive and negative electrode terminals of the storage battery module, and a plurality of bus bars provided on the base plate and connecting the plurality of the connection terminals in series.

Abstract: The present disclosure relates to a storage battery control device, a power storage system, and a storage battery control method. The storage battery control device controls a power storage system including storage battery strings each including storage batteries and connected with each other by a power line, the storage batteries being connected in series, and power converters each provided between the storage battery string and the power line and converting an input and output voltage of the storage battery string. The storage battery control device discharges a target storage battery to a buffer string or an outside of the power storage system to measure a discharge current or a voltage of the target storage battery, and estimates a state of the target storage battery based on the measured discharge current or the measured voltage of the target storage battery.

Abstract: There are provided a bypass circuit and an electrical storage system, the bypass circuit being provided in an electrical storage system including a plurality of electrical storage batteries connected in series and bypasses the electrical storage batteries. The bypass circuit includes: a first switch provided between the adjacent electrical storage batteries, the first switch being opened and closed in response to a first control signal output from a control circuit; a bypass line that bypasses the first switch and each of the electrical storage batteries; a second switch provided on the bypass line, the second switch being opened and closed in response to a second control signal output from the control circuit; and a co-closing prevention unit configured to prevent the first switch and the second switch from being in a closed state at the same time.

Abstract: A battery control unit includes a plurality of battery units, a charger configured to charge a battery, a controller, and a charging controller. Each of the plurality of battery units includes a switching unit. The switching unit is configured to switch between a connected state where the battery configured to be located in the same battery unit as that of the switching unit is connected in series with the battery configured to be located in an adjacent battery unit, and a non-connected state where the battery in the same battery unit as that of the switching unit is disconnected from the series connection with the battery in the adjacent battery unit.

Abstract: A storage battery control device controls a power storage system including a plurality of storage batteries connected in series with a load, a bypass unit configured to bypass the storage battery, and a control device. The control device is configured to execute: a detection process of, during a first discharge period in which a voltage value at discharge is equal to or less than a first discharge threshold value, detecting a zero current state in which the current value detected by a current sensor becomes zero; and a first bypass process of, in response to detecting the zero current state in the detection process, bypassing a storage battery having a voltage value or a state of charge equal to or less than the first discharge threshold value by the bypass unit.

Abstract: A storage battery control device for controlling an energy storage system including storage batteries connected in series, bypass units that bypass the storage batteries respectively, and a current sensor that detects a charge and discharge current flowing from or into the storage batteries. Each of the bypass units includes a bypass line that bypasses the storage battery, a bypass switch that connects and cuts off the bypass line, and a cutoff switch that connects and cuts off the storage battery. The storage battery control device is configured to detect a zero current state in a case that both the bypass switch and the cutoff switch are in a cutoff state in at least one of the bypass units, and perform offset correction of the current sensor based on an output of the current sensor when the zero current state is detected.

Abstract: A power supply control device controls charging and discharging of a power supply device including a plurality of power supply units which are connected in parallel to a load and a power generation unit. The power supply control device has relationship information indicating a relationship among a discharge current flowing from the power supply device to the load, a discharge current ratio that is a ratio of output currents of the plurality of power supply units, and a power loss of the power supply device, acquires a measured value of the discharge current, obtains, from the relationship information, the discharge current ratio at which the power loss of the power supply device corresponding to the acquired measured value of the discharge current is minimized, and adjusts the discharge current ratio so as to match with the discharge current ratio obtained from the relationship information.

Abstract: A storage battery control device for controlling an energy storage system including storage battery rows connected in parallel, each of the storage battery rows having a plurality of storage batteries connected in series and bypass units each of which bypasses corresponding one of the storage batteries, and a switching unit that switches connection and disconnection of the storage battery rows. The storage battery control device executes: charging processing of charging the storage battery rows connected in parallel, first detection processing of detecting a fully charged storage battery during execution of the charging processing, second detection processing of detecting a storage battery having a highest potential among the storage batteries being charged in another storage battery row different from the storage battery row including the fully charged storage battery, and bypass processing of bypassing the storage battery detected in the first detection processing and the second detection processing.

Abstract: A connection terminal includes a terminal connecting portion configured to be electrically connected to a counterpart terminal, an electric wire connecting portion configured to be electrically connected to an electric wire, a holding portion provided between the terminal connecting portion and the electric wire connecting portion and configured to be held by a housing, a sealed space formed in the holding portion, a latent heat storage material and a gas sealed in the sealed space, a sealing hole communicating the sealed space with a space outside the connection terminal, and a plug member configured to block the sealing hole.

Abstract: A switching unit is provided for each of a plurality of batteries arranged in series, and switches between a connected state where the corresponding battery is connected in series with another battery and a non-connected state where series connection between the corresponding battery and the other battery is disconnected. A control unit controls the switching unit corresponding to the battery to switch to the non-connected state when it is determined that the corresponding battery reaches a charge end voltage during charging or a discharge end voltage during discharging, and determinates deterioration of the batteries. Further, the control unit changes the charge end voltage or the discharge end voltage for each of the plurality of batteries in accordance with a deterioration state of the plurality of batteries.

Abstract: A battery control unit includes a plurality of switching units, a first controller, and a plurality of bidirectional voltage converters including a ground terminal, a first, and a second input-output terminal. Each of a plurality of battery packs connected in parallel to each other includes a plurality of batteries connected in series with each other. The plurality of switching units are disposed corresponding to the plurality of batteries respectively, and are configured to switch between a connected state where a corresponding battery among the plurality of batteries is connected in series with non-corresponding battery among the plurality of batteries and a non-connected state where the corresponding battery is disconnected from series connection with the non-corresponding battery.

Abstract: A battery control unit includes a plurality of switching units, a control unit, a charger configured to charge batteries, and a charging control unit. The plurality of switching units is respectively provided for a plurality of batteries connected in series, and are configured to switch between a connected state and a non-connected state. The connected state is a state that a corresponding battery is connected in series with other batteries and the non-connected state is a state that the corresponding battery is disconnected from a series connection with the other batteries. The control unit is configured to determine whether each voltage of the plurality of batteries reaches a charge end voltage during charging, and to control the switching unit corresponding to the battery which is determined to reach the charge end voltage to switch to the non-connected state.