WO2024101335A1 - 充電制御装置および制御方法 - Google Patents

充電制御装置および制御方法 Download PDF

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Publication number
WO2024101335A1
WO2024101335A1 PCT/JP2023/039977 JP2023039977W WO2024101335A1 WO 2024101335 A1 WO2024101335 A1 WO 2024101335A1 JP 2023039977 W JP2023039977 W JP 2023039977W WO 2024101335 A1 WO2024101335 A1 WO 2024101335A1
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Prior art keywords
unit
power
power supply
power storage
charging
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PCT/JP2023/039977
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English (en)
French (fr)
Japanese (ja)
Inventor
克彦 近藤
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克彦 近藤
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Priority to JP2024557411A priority Critical patent/JPWO2024101335A1/ja
Publication of WO2024101335A1 publication Critical patent/WO2024101335A1/ja

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells

Definitions

  • the present invention relates to a charging control device, etc.
  • a charging control device that charges a storage unit, which is a secondary battery, is configured assuming that a commercial power source with a specified AC voltage is used as the power supply source (see, for example, Patent Document 1).
  • the problem that this invention aims to solve is to realize a charging control device that can charge a power storage unit with any supply of power.
  • the first invention is A charge control device that is connected to a DC power supply unit and charges N (N ⁇ 2) power storage units, M (M ⁇ 2) power receiving units that can be electrically connected to the DC power supply unit; M DC/DC converters each provided for each of the power receiving units, each converting a power supplied from the DC power supply unit connected to the power receiving unit into a given charging voltage; a switching unit capable of switching a connection relationship between each of the power storage units and each of the DC/DC converters; A controller for controlling the switching unit; Equipped with The switching unit is a power supply source switching unit that switches a power supply source DC/DC converter among the M DC/DC converters; a power storage unit connection switching unit that switches a connection relationship of the power storage unit that is connected to the power supply source; having The controller controls the power supply source switching unit and the power storage unit connection switching unit based on a power receiving unit to which the DC power supply unit is connected among the M power receiving units.
  • a charging control device is a power supply source switching unit that switches a power supply source DC
  • a control method for a charge control device that is connected to a DC power supply unit and charges N (N ⁇ 2) power storage units comprising:
  • the charging control device includes: M (M ⁇ 2) power receiving units that can be electrically connected to the DC power supply unit; M DC/DC converters each provided for each of the power receiving units, each converting power supplied from the DC power supply unit connected to the power receiving unit into a given charging voltage; a switching unit capable of switching a connection relationship between each of the power storage units and each of the DC/DC converters; Equipped with The switching unit is a power supply source switching unit that switches a power supply source DC/DC converter among the M DC/DC converters; a power storage unit connection switching unit that switches a connection relationship of the power storage unit that is connected to the power supply source; It has controlling the power supply source switching unit and the power storage unit connection switching unit based on a power receiving unit to which the DC power supply unit is connected among the M power receiving units;
  • a control method may be configured.
  • the connection relationship of the power storage unit connected to the DC/DC converter that supplies power can be switched by controlling the switching unit with a controller. This makes it possible to appropriately charge the power storage unit with power supplied from any DC power supply unit connected to the power receiving unit. Also, by configuring the connection relationship of the power storage unit connected to the DC/DC converter so that the charging voltage is close to the voltage of the DC power supply unit connected to the power receiving unit, it is possible to suppress conversion loss in the DC/DC converter as much as possible, making it possible to achieve more efficient charging.
  • the second invention is the above-mentioned invention, the power storage unit connection switching unit switches between an individual connection in which the power storage units are individually connected to the power supply source, a parallel connection in which the power storage units are connected in parallel, and a series connection in which the power storage units are connected in series; A charging control device.
  • the second invention it is possible to charge the storage unit with power of various voltages and currents depending on the number of DC power supply units connected to the power receiving unit, the combination of voltages of the power supply, and the connection relationship of the storage unit, such as individual connection, parallel connection, or series connection. This makes it possible to appropriately control the charging of the storage unit in response to any DC power supply unit that supplies various voltages and currents of power.
  • the third invention is the above-mentioned invention,
  • the DC power supply unit having a different power supply voltage can be connected to the power receiving unit, a voltage acquisition unit that acquires a voltage of the DC power supply unit connected to the power receiving unit; Further comprising:
  • the controller controls the power storage unit connection switching unit based on a voltage of the DC power supply unit connected to the power receiving unit.
  • a charging control device
  • DC power supply units with various different voltages can be connected to the power receiving unit, and by controlling the switching unit based on the voltage of the DC power supply unit, it becomes possible to appropriately control the charging of the power storage unit in accordance with any DC power supply unit with various supply power voltages.
  • a fourth aspect of the present invention is the above-mentioned invention,
  • the N power storage units include power storage units having different rated voltages,
  • the controller controls the power storage unit connection switching unit based on a voltage of the DC power supply unit connected to the power receiving unit and a rated voltage of each of the N power storage units.
  • a charging control device is a fourth aspect of the present invention.
  • the fourth invention it is possible to configure the connection relationship of the power storage unit so that charging power of a voltage corresponding to the rated voltage is supplied to the power storage unit by referring to the voltage of the DC power supply unit. This makes it possible to perform appropriate charging control according to the rated voltage of the power storage unit.
  • a fifth aspect of the present invention is the above-mentioned invention, a charging status acquisition unit that acquires a charging status of each of the N power storage units; Further comprising: The controller dynamically controls the power supply source switching unit and the power storage unit connection switching unit based on a charging status of each of the N power storage units.
  • a charging control device a charging control device.
  • the DC/DC converter of the power supply source can be dynamically switched based on the charging status of each power storage unit, and the connection relationship of the power storage units connected to the DC/DC converter of the power supply source can be dynamically switched.
  • This enables more appropriate charging control of the power storage units according to the charging status. For example, when multiple power storage units are charged simultaneously, it is possible to control the switching unit so that a power storage unit that has reached a predetermined charging status (for example, full charge or a charging rate of 90%) is disconnected from the DC/DC converter of the power supply source, or to control charging so as to align the charging status of multiple power storage units.
  • a predetermined charging status for example, full charge or a charging rate of 90%
  • the controller has a charging order setting unit that sets a charging order for the N power storage units, and controls the power supply source switching unit and the power storage unit connection switching unit based on the charging order.
  • a charging control device is a charging order setting unit that sets a charging order for the N power storage units, and controls the power supply source switching unit and the power storage unit connection switching unit based on the charging order.
  • appropriate charging control of the power storage units is possible based on the charging order set for the N power storage units.
  • the charging order of the power storage units may be set, for example, according to an external input, or according to conditions related to the power storage units, such as specifications such as capacity and rated voltage, or charging conditions such as the charging rate. For example, when the conditions related to the power storage units are set, the time required to charge each power storage unit can be taken into consideration, thereby realizing more appropriate charging control.
  • FIG. 1 is a configuration diagram of a power storage system.
  • 3 shows an example of a connection relationship of a power storage unit.
  • 3 shows an example of a connection relationship of a power storage unit.
  • 4 shows an example of a connection relationship of a power storage unit.
  • Controller configuration diagram An example of power receiving unit data.
  • 13 is an example of power storage unit data.
  • 13 is an example of charging order setting data.
  • FIG. 1 is a schematic diagram of a power storage system 1 in this embodiment.
  • the power storage system 1 includes a power storage device 10, which is a secondary battery, and a charging control device 20 that is connected to a DC power supply unit 9 and charges the power storage device 10.
  • the power storage system 1 is a power supply facility in which various devices are housed in one or more housings and can be installed and moved to any position by being handled like a container and mounted on a vehicle such as a truck or a trailer.
  • the DC power supply unit 9 is a power source that supplies DC power, and is, for example, a solar power generation system.
  • the power transmission end of the DC power supply unit 9 and the power receiving unit 30 are connected one-to-one. For example, when the DC power supply unit 9 is a solar power generation system and a power transmission end is provided for each solar cell string, it is possible to connect each power transmission end to the power receiving unit 30.
  • FIG. 2 is a configuration diagram of the energy storage system 1.
  • the energy storage device 10 has N (N ⁇ 2) energy storage units 12.
  • the energy storage units 12 are secondary batteries that can be repeatedly charged and discharged.
  • the charging control device 20 is a device that connects to a DC power supply unit 9 to charge N power storage units 12, and has M (M ⁇ 2) power receiving units 30 that can be electrically connected to the DC power supply unit 9, M DC/DC converters 40 that are provided for each power receiving unit 30 and convert the power supplied from the DC power supply unit 9 connected to the power receiving unit 30 into a given charging voltage, a switching unit 50, and a controller 60.
  • the switching unit 50 has a plurality of switches (shown by circles in FIG. 2) and switches the connection between each of the power storage units 12 and each of the DC/DC converters 40.
  • the on/off (open/close) of the switches is controlled by the controller 60.
  • the switches may be configured as relay circuits or may be configured as circuits using power semiconductors.
  • the switching unit 50 has a power storage unit connection switching unit 54 and a power supply source switching unit 52.
  • the power supply source switching unit 52 switches the power supply source DC/DC converter 40 among the M DC/DC converters 40.
  • the switches of the power supply source switching unit 52 are arranged in a matrix so as to connect and disconnect the intersections of the power supply positive line L3 and the power supply negative line L4 (shown as horizontal lines in FIG. 2) connected to the positive (+) and negative (-) output terminals of the DC/DC converter 40, respectively, and the connection line L5 (shown as a vertical line in FIG. 2).
  • the power storage unit connection switching unit 54 switches the connection relationship of the power storage unit 12 that is connected to the power source DC/DC converter 40 among the M DC/DC converters 40.
  • the switches of the power storage unit connection switching unit 54 are arranged in a matrix so as to connect and disconnect the intersections of the power storage positive line L1 and the power storage negative line L2 (shown as horizontal lines in FIG. 2) that are connected to the positive (+) and negative (-) input terminals of the power storage unit 12, respectively, and the connection line L5 (shown as a vertical line in FIG. 2).
  • connection lines L5 are multiple electric wires that are wired to bridge the storage unit connection switching unit 54 and the power supply source switching unit 52.
  • Each of the connection lines L5 may be used as a positive electrode wire or a negative electrode wire.
  • the switching unit 50 constitutes a power network that can connect N storage positive lines L1 and N storage negative lines L2 to M power supply positive lines L3 and M power supply negative lines L4 in any connection form via a connection line L5.
  • the connection form refers to the type of connection, such as connecting multiple storage units 12 in series or parallel, connecting multiple DC/DC converters 40 in series or parallel, or connecting one DC/DC converter 40 to one storage unit 12.
  • the power receiving unit 30 has a power receiving terminal that can be electrically connected to the DC power supply unit 9. Note that the power receiving unit 30 may be realized by non-contact power reception (wireless power transmission) instead of contact power reception via a power receiving terminal.
  • the DC/DC converter 40 has its transformation operation controlled by the controller 60 so that it steps up or down the input voltage (the voltage on the power receiving unit 30 side) so that the output voltage (the voltage on the switching unit 50 side) becomes a given charging voltage.
  • the DC/DC converter 40 has voltage sensors at the input and output stages, and outputs the detected input voltage and output voltage (charging voltage) to the controller 60 at any time. Input and output of data between the DC/DC converter 40 and the controller 60 can be achieved by wired or wireless communication.
  • the controller 60 controls the power supply source switching unit 52 and the power storage unit connection switching unit 54 of the switching unit 50 based on the power receiving unit 30 to which the DC power supply unit 9 is connected among the M power receiving units 30. Specifically, the controller 60 controls the switching unit 50 based on the power supply voltage of the DC power supply unit 9 connected to the power receiving unit 30.
  • the power supply voltage of the DC power supply unit 9 can be obtained by an operator's operation input using an input device such as a button switch, keyboard, or touch panel integrally formed with the display provided on the controller 60.
  • a reading device that reads specification data including the power supply voltage of the DC power supply unit 9 from an IC tag provided on the DC power supply unit 9 may be provided on the power receiving unit 30, and the data read by the reading device may be output to the controller 60 (by wired communication or wireless communication).
  • the specification data of the DC power supply unit 9 is stored in advance in the IC tag. By acquiring the specification data, the controller 60 can recognize which power receiving unit 30 the DC power supply unit 9 is connected to and the power supply voltage of the connected DC power supply unit 9.
  • the detected value of the input voltage input from the DC/DC converter 40 may be determined to be the power supply voltage of the DC power supply unit 9.
  • the controller 60 also controls the switching unit 50 based on the rated voltage of each of the N storage units 12.
  • the data on the rated voltage of the storage units 12 can be obtained, for example, by an operator using an input device provided in the controller 60, in the same way as the above-mentioned acquisition of the power supply voltage of the DC power supply unit 9.
  • this can be achieved by providing a reading device that reads specification data including the rated voltage of the storage unit 12 from the BMS (Battery Management System) of the storage unit 12 or an IC tag provided in the storage unit 12, and outputting the data read by the reading device to the controller 60 (by wired or wireless communication).
  • the specification data of the storage unit 12 is stored in advance in the BMS or IC tag.
  • the controller 60 controls the on/off of the switch of the power supply source switching unit 52 so that the DC/DC converter 40 corresponding to the power receiving unit 30 to which the DC power supply unit 9 is connected is the power supply source.
  • the controller 60 also controls the on/off of the switch of the power storage unit connection switching unit 54 so that charging power according to the rated voltage of the power storage unit 12 is supplied (power is fed), thereby configuring the connection relationship of the power storage unit 12 to be connected to the DC/DC converter 40 of the power supply source.
  • the controller 60 also dynamically controls the power supply source switching unit 52 and the storage unit connection switching unit 54 of the switching unit 50 based on the charging status of each of the N storage units 12.
  • the charging status of the storage unit 12 can be obtained by the controller 60 calculating it based on the input voltage and input current of the storage unit 12 measured by a voltmeter and ammeter provided at the input end of the storage unit 12, for example.
  • the charging status may also be obtained by the BMS (Battery Management System) of the storage unit 12 outputting it to the controller 60.
  • the charging status may be, for example, the charging rate or SoC (State of Charge).
  • the controller 60 dynamically controls based on the charging status of the power storage unit 12. For example, when the power storage unit 12 reaches a predetermined charging status, such as full charge or a charging rate of 90%, the controller 60 controls the switching unit 50 to disconnect the DC/DC converter 40 to which the power storage unit 12 is connected. The controller 60 also controls the switching unit 50 to connect the disconnected DC/DC converter 40 to another power storage unit 12 that is not being charged.
  • a predetermined charging status such as full charge or a charging rate of 90%
  • the controller 60 also controls the power supply source switching unit 52 and the power storage unit connection switching unit 54 based on the charging order set for the N power storage units 12.
  • the charging order for the power storage units 12 can be set by an operator using an input device provided in the controller 60, similar to the above-mentioned acquisition of the power supply voltage of the DC power supply unit 9 and the rated voltage of the power storage units 12.
  • the charging order may be set according to conditions related to the power storage units 12, such as specifications such as capacity and rated voltage, or charging conditions such as the charging rate.
  • the order in order to shorten the total charging time, the order is set to give priority to the storage units 12 with a low charging rate (i.e., the time required to charge is long), and (b) the order is set to give priority to parallel or series connections that allow multiple storage units 12 to be charged by one DC power supply unit, and in this case, in order to suppress the conversion loss of the DC/DC converter 40, the combination of storage units 12 is set so that the power supply voltage of the DC power supply unit 9 and the charging voltage (output voltage of the DC/DC converter 40) are close, or the order is set so that the charging rates of the storage units 12 connected in parallel or series are the same.
  • connection patterns for the power storage units 12 connected to the DC/DC converter 40 of the power supply source which are realized by the control of the power storage unit connection switching unit 54.
  • the power supply source switching unit 52 may connect multiple DC/DC converters 40 in series to form one group of DC/DC converters 40 as the power supply source, and one power storage unit 12 may be connected to this group, or multiple power storage units 12 may be connected in series or in parallel to this group.
  • three patterns for forming a connection relationship for one DC/DC converter 40 are adopted. That is, in this embodiment, the power storage system 1 has M power receiving units 30 and can simultaneously supply power from a maximum of M DC power supply units 9, but one power storage unit 12 is connected and charged with a maximum of one DC/DC converter 40 (DC power supply unit 9) as the power supply source.
  • a connection relationship in which the input voltage of the DC/DC converter 40 (the voltage on the power receiving unit 30 side) is approximately equal to the optimal charging voltage according to the rated voltage of the power storage unit 12 is preferentially selected.
  • FIGS. 3 to 5 are diagrams showing an example of the connection relationship of the power storage unit 12 and an example of the on/off state of each switch of the switching unit 50 in that case.
  • a black circle in the switching unit 50 indicates an on (closed) switch
  • a white circle indicates an off (open) switch.
  • the current flow between the power receiving unit 30 and the power storage unit 12 is indicated by a thick black line. Also, to make it easier to understand, the DC/DC converter 40 and the like are not shown.
  • FIG. 3 shows an example of individual connection.
  • FIG. 3 illustrates three storage units 12A to 12C, each with a different combination of rated voltages.
  • a DC power supply unit 9A with a supply voltage of 500V and a supply current of 35A is connected to a first power receiving unit 30A.
  • one storage unit 12 that is closest to the supply voltage of the DC power supply unit 9 is connected to the power receiving unit 30 to which the DC power supply unit 9 is connected.
  • the first power receiving unit 30A to which the DC power supply unit 9A is connected is connected (separately connected) to the first power supply unit 9A.
  • the first power storage unit 12A has a rated voltage of 500V, which is closest to (in this case, coincides with) the power supply voltage of the DC power supply unit 9A. That is, the positive electrode (+) of the first power storage unit 12A is connected to the positive electrode (+) of the first power receiving unit 30A, and the negative electrode (-) of the first power storage unit 12A is connected to the negative electrode (-) of the first power receiving unit 30A.
  • the switching control of the switching unit 50 is performed by turning on (closing) the switches Q1 and Q2 of the power storage unit connection switching unit 54 to set the connection relationship of the first power storage unit 12A to an individual connection, and turning on (closing) the switches Q3 and Q4 of the power supply source switching unit 52 to connect the first power receiving unit 30A as the power supply source of the individual connection.
  • the DC/DC converter 40 corresponding to the first power receiving unit 30A has its voltage transformation operation controlled by the controller 60, and outputs the charging power to the first power storage unit 12A.
  • the voltage input to the DC/DC converter 40 (voltage on the first power receiving unit 30A side) and the voltage output from the DC/DC converter 40 (voltage on the switching unit 50 side; charging voltage) are approximately the same voltage. Therefore, the voltage transformation in the DC/DC converter 40 is realized with high efficiency.
  • first power storage unit 12A and second power storage unit 12B whose rated voltage is 500V, which is closest to (in this case, coincides with) the power supply voltage of 500V of DC power supply unit 9B, are connected in parallel (connected in parallel) to first power receiving unit 30A to which DC power supply unit 9B is connected.
  • the positive electrodes (+) of first power storage unit 12A and second power storage unit 12B are connected to the positive electrode (+) of first power receiving unit 30A
  • the negative electrodes (-) of first power storage unit 12A and second power storage unit 12B are connected to the negative electrode (-) of first power receiving unit 30A.
  • the switching control of the switching unit 50 is performed by turning on (closing) the switches Q1, Q2, Q5, and Q6 of the power storage unit connection switching unit 54 to connect the first power storage unit 12A and the second power storage unit 12B in parallel, and turning on (closing) the switches Q3 and Q4 of the power supply source switching unit 52 to make the first power receiving unit 30A the power supply source of the parallel connection.
  • the individual connection in FIG. 3 and the parallel connection in FIG. 4 have the same charging voltage of 500 V, but the charging current to the power storage unit 12 that is the charging destination is different. Since the power supply current is diverted in the parallel connection, the individual connection in FIG. 3 can obtain a larger charging current.
  • FIG. 5 shows an example of a series connection.
  • FIG. 5 illustrates three storage units 12A to 12C, which are different combinations of rated voltages among the storage units 12 of the power storage device 10.
  • a DC power supply unit 9C with a feed voltage of 1250 V and a feed current of 10 A is connected to a first power receiving unit 30A.
  • the multiple storage units 12 whose total rated voltage is closest to the feed voltage of the DC power supply unit 9 are connected in series to the power receiving unit 30 to which the DC power supply unit 9 is connected.
  • the switching control of the switching unit 50 is performed by turning on (closing) the switches Q1, Q2, Q7, and Q8 of the power storage unit connection switching unit 54 to connect the first power storage unit 12A and the third power storage unit 12C in series, and turning on (closing) the switches Q3 and Q9 of the power supply source switching unit 52 to make the first power receiving unit 30A the power supply source for the series connection.
  • Controller configuration 6 is a diagram showing an example of the configuration of the controller 60.
  • the controller 60 is realized as a type of computer system, and includes an input unit 102, a communication unit 104, a display unit 106, a sound emitting unit 108, a control unit 200, and a storage unit 300.
  • the input unit 102 is realized as an input device or an input interface such as a button switch or a keyboard that accepts operational input from an operator, or a touch panel formed integrally with a display.
  • the communication unit 104 is realized as a wireless or wired communication device for communicating with an external device, or as a communication interface thereof.
  • the display unit 106 is realized as a lamp, a display, or the like.
  • the sound emission unit 108 is realized as a speaker, or the like.
  • the control unit 200 is realized by an arithmetic circuit equipped with processors such as a CPU (Central Processing Unit), MPU (Micro-Processing Unit), and DSP (Digital Signal Processor).
  • processors such as a CPU (Central Processing Unit), MPU (Micro-Processing Unit), and DSP (Digital Signal Processor).
  • control unit 200 may be provided by an ASIC (Application Specific Integrated Circuit), a GPU (Graphics Processing Unit), etc., or may be realized by hardware circuits such as an FPGA (Field-Programmable Gate Array) or a dedicated LSI (Large Scale Integration).
  • ASIC Application Specific Integrated Circuit
  • GPU Graphics Processing Unit
  • hardware circuits such as an FPGA (Field-Programmable Gate Array) or a dedicated LSI (Large Scale Integration).
  • the control unit 200 has, as functional units, a switching control unit 202, a power supply voltage acquisition unit 204, a rated voltage acquisition unit 206, a charging status acquisition unit 208, and a charging order setting unit 210.
  • the switching control unit 202 controls the power supply source switching unit 52 and the power storage unit connection switching unit 54 based on the power receiving unit 30 to which the DC power supply unit 9 is connected among the M power receiving units 30.
  • the power storage unit connection switching unit 54 can switch between an individual connection in which the power storage units 12 are individually connected to the power supply source, a parallel connection in which the power storage units 12 are connected in parallel, and a series connection in which the power storage units 12 are connected in series (see Figures 3 to 5).
  • a DC power supply unit 9 with a different power supply voltage can be connected to the power receiving unit 30, and the switching control unit 202 controls the power storage unit connection switching unit 54 based on the voltage of the DC power supply unit 9 connected to the power receiving unit 30.
  • the switching control unit 202 controls the power storage unit connection switching unit 54 based on the voltage of the DC power supply unit 9 connected to the power receiving unit 30.
  • the voltage of the DC power supply unit 9 connected to the power receiving unit 30 is acquired by the power supply voltage acquisition unit 204.
  • the power supply voltage acquisition unit 204 can acquire the voltage (power supply voltage) of the DC power supply unit 9, for example, by an operator's operation input via the input unit 102.
  • a reading device that reads specification data including the power supply voltage of the DC power supply unit 9 from an IC tag provided in the DC power supply unit 9 and outputs the read data to the controller 60 (wired communication or wireless communication) may be provided in the power receiving unit 30, and the data output by the reading device may be acquired via the communication unit 104.
  • the specification data of the DC power supply unit 9 is stored in advance in the IC tag.
  • the power supply voltage acquisition unit 204 may acquire the detection value of a voltage sensor provided in the input stage of the DC/DC converter 40.
  • the voltage (power supply voltage) of the DC power supply unit 9 acquired by the power supply voltage acquisition unit 204 is stored as part of the power receiving unit data 302.
  • FIG. 7 is an example of the power receiving unit data 302.
  • the power receiving unit data 302 stores, for each power receiving unit 30, the voltage (power supply voltage) and current (power supply current) of the DC power supply unit 9 connected to that power receiving unit 30 in association with each other. Data relating to power receiving units 30 to which a DC power supply unit 9 is not connected is not stored. Therefore, it is also possible to determine which power receiving unit 30 the DC power supply unit 9 is connected to from the power receiving unit data 302.
  • the N storage units 12 also include storage units 12 with different rated voltages, and the switching control unit 202 controls the storage unit connection switching unit 54 based on the voltage of the DC power supply unit 9 connected to the power receiving unit 30 and the rated voltage of each of the N storage units 12.
  • the rated voltage of the storage unit 12 is acquired by the rated voltage acquisition unit 206.
  • the rated voltage acquisition unit 206 can realize the rated voltage of the storage unit 12, for example, by an operator's operational input via the input unit 102.
  • a reading device may be provided that reads specification data including the rated voltage of the storage unit 12 from the BMS (Battery Management System) of the storage unit 12 or an IC tag provided on the storage unit 12, and the data read by the reading device may be acquired via the communication unit 104.
  • the specification data of the storage unit 12 is stored in advance in the BMS or IC tag.
  • the rated voltage of the power storage unit 12 acquired by the rated voltage acquisition unit 206 is stored as part of the power storage unit data 304.
  • FIG. 8 is an example of the power storage unit data 304.
  • the power storage unit data 304 stores the rated voltage and the charging status for each power storage unit 12 in the power storage device 10 in association with each other.
  • the charging status is a value acquired by the charging status acquisition unit 208, and is updated at the time of acquisition.
  • the switching control unit 202 also dynamically controls the power supply source switching unit 52 and the storage unit connection switching unit 54 based on the charging status of each of the N storage units 12.
  • the charging status of each of the N storage units 12 is acquired by the charging status acquisition unit 208.
  • the charging status acquisition unit 208 can acquire the charging status of the storage unit 12, for example, by calculating it based on the input voltage and input current of the storage unit 12 measured by a voltmeter and ammeter provided at the input terminal of the storage unit 12.
  • the charging status output by the BMS (Battery Management System) of the storage unit 12 may be acquired via the communication unit 104.
  • the charging status is, for example, the charging rate and SoC (State of Charge).
  • the charging status of the storage unit 12 acquired by the charging status acquisition unit 208 is stored as part of the storage unit data 304.
  • the switching control unit 202 also controls the power supply source switching unit 52 and the storage unit connection switching unit 54 based on the charging order set for the N storage units 12.
  • the charging order is set by the charging order setting unit 210.
  • the charging order setting unit 210 can set the charging order of the power storage units 12, for example, by an operator's operation input via the input unit 102.
  • the charging order may be set according to conditions related to the power storage units 12, such as specifications such as capacity and rated voltage, and charging conditions such as charging rates.
  • the charging order is set to a power storage unit 12 with a low charging rate (i.e., a long charging time) first
  • a combination of power storage units 12 is set so that the power supply voltage of the DC power supply unit and the charging voltage (output voltage of the DC/DC converter 40) are close to each other, or the charging order is set so that the charging rates of the power storage units 12 connected in parallel or series are the same.
  • the charging order set by the charging order setting unit 210 is stored as charging order setting data 308.
  • FIG. 9 is an example of the charging order setting data 308.
  • the charging order setting data 308 stores, in association with the charging order, a combination of the power storage units 12 to be charged, the power receiving unit 30 that supplies power, the connection pattern of the power storage units 12, the charging voltage output by the DC/DC converter 40 that corresponds to the power receiving unit 30, and the target charging rate that is the target charging status of the power storage units 12.
  • one power storage unit 12 is charged by power supplied from a maximum of one DC power supply unit 9.
  • the connection relationship of the power storage unit 12 to the power supply source DC/DC converter 40 is set to three patterns: individual connection, parallel connection, and series connection (see Figures 3 to 5).
  • the charging order prioritizes parallel connection and series connection. Specifically, a group of connection relationships of the storage units 12 to be connected to each of the power receiving units 30 (DC power supply unit 9) of the power supply source is determined, and for each group, the charging order is set in ascending order of charging rate so that the charging rates of the storage units 12 are uniform. For example, the setting data in the upper row of the charging order setting data 308 in FIG. 9 sets the charging order of the group related to the first to second storage units 12.
  • the setting data in the lower part of the charging order setting data 308 in FIG. 9 sets the charging order of the group related to the third to fourth power storage units 12.
  • the switching control unit 202 controls the power supply source switching unit 52 and the power storage unit connection switching unit 54 (turning the switches on and off) according to the connection relationship definition table 306.
  • FIG. 10 is an example of the connection relationship definition table 306.
  • Table 306-m defines the "switch to be turned on" among the switches of the switching unit 50 for each of the connection relationships of the power storage units 12 connected to the power receiving unit 30.
  • the connection relationships of the power storage units 12 include the number of power storage units 12 to be connected, the pattern (distinguishing between individual, parallel, and series connection), and the combination of the power storage units 12 to be connected.
  • the memory unit 300 is realized by a flash memory, a ROM (Read Only Memory), a RAM (Random Access Memory), a HDD (Hard Disk Drive), a SSD (Solid State Drive), an EPROM (Erasable Programmable ROM), etc.
  • the memory unit 300 stores power receiving unit data 302, power storage unit data 304, a connection relationship definition table 306, and charging order setting data 308.
  • [Process flow] 11 is a flowchart of the charging control process executed by the controller 60.
  • the rated voltage acquisition unit 206 acquires the rated voltage of each of the power storage units 12 (step S1).
  • the charging status acquisition unit 208 starts detecting the charging status of each of the power storage units 12 (step S3). Thereafter, the charging status acquisition unit 208 periodically detects the charging status of each of the power storage units 12.
  • the power supply voltage acquisition unit 204 starts detecting the power supply voltage of the DC power supply unit 9 connected to each of the power receiving units 30 (step S5). Thereafter, the power supply voltage acquisition unit 204 periodically detects the power supply voltage of the DC power supply unit 9.
  • the charging order setting unit 210 sets the charging order of the power storage units 12 based on the rated voltage and charging status of each of the power storage units 12, the power supply voltage of each of the power receiving units 30, etc. (step S7).
  • the set charging order data is stored in the storage unit 300 as charging order setting data 308.
  • the switching control unit 202 performs switching control so that charging (supply of charging power from the power receiving unit 30, which is the power supply source, to the power storage units 12) according to the set charging order is realized (step S9).
  • the switching unit 50 switches on and off so that a connection relationship between the power receiving unit 30 and the power storage unit 12 corresponding to the charging order "1" in the charging order setting data 308 is formed.
  • control of the charging voltage output by the DC/DC converter 40 corresponding to each of the power receiving units 30 is started (step S11).
  • step S13: NO) it is determined whether the power supply voltage of the power receiving unit 30 has changed.
  • This change in power supply voltage includes not only a change in the voltage of the DC power supply unit 9 already connected, but also the connection of a new DC power supply unit 9.
  • step S15 If it is determined that the power supply voltage of the power receiving unit 30 has changed (step S15: YES), the process returns to step S7, and the charging order setting unit 210 again sets the charging order of the power storage units 12 according to the changed power supply voltage of the power receiving unit 30 and the current charging status of each of the power storage units 12 (step S7).
  • step S13 If it is determined that the charging status of the power storage units 12 has reached a predetermined target charging status (step S13: YES), it is determined whether or not to end the charging control. Specifically, if the charging status of all the power storage units 12 has reached the target charging status corresponding to the final charging order, it is determined that charging is complete and that the charging control should be ended.
  • the switching control unit 202 performs switching control according to the storage unit 12 that has reached the target charging state (step S19). That is, for example, the switching unit 50 controls the switch of the switching unit 50 to be switched on/off so that the storage unit 12 that has reached the target charging state is disconnected from the DC/DC converter 40 that supplies power and the supply of charging power to the storage unit 12 is terminated. Alternatively, when the charging states of all the storage units 12 have reached the target charging state corresponding to the current charging order, the switching unit 50 controls the switch of the switching unit 50 to be switched on/off so that the connection relationship between the receiving unit 30 and the storage unit 12 corresponding to the next charging order is configured. At the same time, the control of the charging voltage output by the DC/DC converter 40 corresponding to each receiving unit 30 is started (step S21). After that, the control returns to step SS13 and the same process is repeated.
  • step S17 If it is determined in step S17 that charging control should be terminated (step S17: YES), this process ends.
  • connection relationship of the power storage unit 12 connected to the DC/DC converter 40 so that the charging voltage is close to the voltage of the DC power supply unit 9 connected to the power receiving unit 30, it is possible to suppress the conversion loss in the DC/DC converter 40 as much as possible, and it is possible to realize more efficient charging.
  • Each switch of the switching unit 50 may be provided with a communication device, and the operation status of the switch (on/off state, execution of switching operation, etc.) may be output (by wired communication or wireless communication) to the controller 60.
  • the controller 60 determines whether each switch is normal or not based on the operation status of the switch acquired from these communication devices, and controls the switching unit 50 so as to use only the switches determined to be normal. This enables more appropriate charging control of the power storage unit 12.
  • the communication device provided in each switch can be, for example, a wireless communication device that complies with the Wi-SUN (Wireless Smart Utility Network) standard, which is a specific low-power wireless standard.
  • Wi-SUN Wireless Smart Utility Network
  • the Wi-SUN standard allows long-distance communication with very little power consumption and supports multi-hop communication, making it suitable as a communication device to be provided in a switching unit 50 that has many switches.
  • data input and output between the controller 60 and the power receiving unit 30, DC/DC converter 40, and power storage unit 12 can be realized by this Wi-SUN wireless communication device.
  • the charging control device 20 may charge the power storage unit 12 of the power storage device 10 by wireless power supply.
  • the energy storage units 12 of the energy storage device 10 may be configured to be replaceable.
  • the charge control device 20 is provided with a plurality of charging terminal units to which the energy storage units 12 can be electrically connected, and the controller 60 controls the switching unit to connect one of the charging terminal units to which the energy storage units are connected to the DC/DC converter 40 that supplies power.
  • a charge control device that is connected to a DC power supply unit and charges N (N ⁇ 2) power storage units, M (M ⁇ 2) power receiving units that can be electrically connected to the DC power supply unit; M DC/DC converters each provided for each of the power receiving units, each converting a power supplied from the DC power supply unit connected to the power receiving unit into a given charging voltage; a switching unit capable of switching a connection relationship between each of the power storage units and each of the DC/DC converters; A controller for controlling the switching unit; Equipped with The switching unit is a power supply source switching unit that switches a power supply source DC/DC converter among the M DC/DC converters; a power storage unit connection switching unit that switches a connection relationship of the power storage unit that is connected to the power supply source; having The controller controls the power supply source switching unit and the power storage unit connection switching unit based on a power receiving unit to which the DC power supply unit is connected among the M power receiving units.
  • Charging control device The switching unit is a power supply source switching unit that switches a power supply source DC/
  • the power storage unit connection switching unit switches between an individual connection in which the power storage units are individually connected to the power supply source, a parallel connection in which the power storage units are connected in parallel, and a series connection in which the power storage units are connected in series;
  • a charging control device according to a first aspect of the present invention.
  • the DC power supply unit having a different power supply voltage can be connected to the power receiving unit, a voltage acquisition unit that acquires a voltage of the DC power supply unit connected to the power receiving unit; Further comprising: The controller controls the power storage unit connection switching unit based on a voltage of the DC power supply unit connected to the power receiving unit.
  • a charging control device according to the first or second invention.
  • the N power storage units include power storage units having different rated voltages,
  • the controller controls the power storage unit connection switching unit based on a voltage of the DC power supply unit connected to the power receiving unit and a rated voltage of each of the N power storage units.
  • a charge control device according to any one of the first to third aspects of the present invention.
  • (Fifth Invention) a charging status acquisition unit that acquires a charging status of each of the N power storage units; Further comprising: The controller dynamically controls the power supply source switching unit and the power storage unit connection switching unit based on a charging status of each of the N power storage units.
  • a charge control device according to any one of the first to fourth aspects of the present invention.
  • the controller has a charging order setting unit that sets a charging order for the N power storage units, and controls the power supply source switching unit and the power storage unit connection switching unit based on the charging order.
  • a charge control device according to any one of the first to fifth aspects of the present invention.
  • a control method for a charge control device that is connected to a DC power supply unit and charges N (N ⁇ 2) power storage units comprising:
  • the charging control device includes: M (M ⁇ 2) power receiving units that can be electrically connected to the DC power supply unit; M DC/DC converters each provided for each of the power receiving units, each converting power supplied from the DC power supply unit connected to the power receiving unit into a given charging voltage; a switching unit capable of switching a connection relationship between each of the power storage units and each of the DC/DC converters; Equipped with The switching unit is a power supply source switching unit that switches a power supply source DC/DC converter among the M DC/DC converters; a power storage unit connection switching unit that switches a connection relationship of the power storage unit that is connected to the power supply source; It has controlling the power supply source switching unit and the power storage unit connection switching unit based on a power receiving unit to which the DC power supply unit is connected among the M power receiving units; Control methods.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
PCT/JP2023/039977 2022-11-10 2023-11-07 充電制御装置および制御方法 WO2024101335A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4788449A (en) * 1987-04-24 1988-11-29 The Foxboro Company Redundant power distribution
WO2011052407A1 (ja) * 2009-10-29 2011-05-05 三洋電機株式会社 切替回路、制御装置および発電システム
JP2012070492A (ja) * 2010-09-21 2012-04-05 Panasonic Electric Works Co Ltd 充放電システム
JP2013529052A (ja) * 2010-05-19 2013-07-11 エービービー・ビー．ブイ． 電動車両のための充電システム
WO2015015796A1 (ja) * 2013-07-29 2015-02-05 京セラ株式会社 電力変換装置、電力変換装置の制御方法、及び電力変換システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4788449A (en) * 1987-04-24 1988-11-29 The Foxboro Company Redundant power distribution
WO2011052407A1 (ja) * 2009-10-29 2011-05-05 三洋電機株式会社 切替回路、制御装置および発電システム
JP2013529052A (ja) * 2010-05-19 2013-07-11 エービービー・ビー．ブイ． 電動車両のための充電システム
JP2012070492A (ja) * 2010-09-21 2012-04-05 Panasonic Electric Works Co Ltd 充放電システム
WO2015015796A1 (ja) * 2013-07-29 2015-02-05 京セラ株式会社 電力変換装置、電力変換装置の制御方法、及び電力変換システム

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