WO2018056258A1 - Appareil de stockage, système de stockage et procédé de commande de charge - Google Patents

Appareil de stockage, système de stockage et procédé de commande de charge Download PDF

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Publication number
WO2018056258A1
WO2018056258A1 PCT/JP2017/033709 JP2017033709W WO2018056258A1 WO 2018056258 A1 WO2018056258 A1 WO 2018056258A1 JP 2017033709 W JP2017033709 W JP 2017033709W WO 2018056258 A1 WO2018056258 A1 WO 2018056258A1
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WIPO (PCT)
Prior art keywords
storage battery
full charge
charge voltage
difference
charging
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Application number
PCT/JP2017/033709
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English (en)
Japanese (ja)
Inventor
圭佑 吉田
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日本電気株式会社
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Publication of WO2018056258A1 publication Critical patent/WO2018056258A1/fr

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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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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 power storage device, a power storage system, and a charge control method, and in particular, realizes a long life and efficient use of the power storage device by changing the effective capacity according to the usage status and usage environment of the power storage device.
  • the present invention relates to a power storage device that can be used.
  • Patent Document 1 discloses an example of a stationary power storage system in which charging is performed with nighttime power and discharging is performed at times other than during nighttime power supply.
  • the ambient temperature of the battery is monitored, and when the temperature becomes a predetermined value or more, the cooling means is driven, and when the temperature becomes a predetermined value or less, the heating means is driven.
  • the battery life in the power storage system is estimated based on “typical charge / discharge cycle”. For example, if the battery is used up every day, or if the internal temperature of the battery is higher than the temperature change announced by the Japan Meteorological Agency (due to solar radiation, etc.), the battery performance will be at an earlier stage than the expected life due to deterioration. May be reduced. Furthermore, there is room for improvement from the viewpoint of economic rationality when the electricity storage system is simply used with a preset usage pattern (conditions for charging, etc.) regardless of the user's usage status or electricity rate market. Is left behind.
  • the present inventor can solve the problems such as long life and high capacity by changing the effective capacity according to the use situation and use environment of the power storage device in the examination of the full charge voltage value, the effective capacity and the life.
  • the present invention has been achieved.
  • An object of the present invention is to provide a power storage device, a power storage system, and the like that can realize a long life and efficient use of the power storage device by changing the effective capacity according to the usage status and usage environment of the power storage device. It is to provide.
  • a power storage device is as follows: A rechargeable storage battery; A control unit configured to control the charging operation of the storage battery and communicating with an external device; A power storage device comprising: The controller is a1: Obtain information on the difference in electricity prices between day and night, a2: It is determined whether the price difference is large by comparing the difference between the electricity prices and a predetermined reference value. a3: When the price difference is large, the full charge voltage for charging the storage battery is set to a relatively high value; a4: When the price difference is small, the full charge voltage for charging the storage battery is set to a relatively low value.
  • a power storage device configured as described above.
  • control unit may include a microcomputer and a memory as hardware, and the software is realized by a program loaded in the memory.
  • functions realized by cooperation of hardware and software may be described as “blocks” or “units”. Note that these functional blocks and the like can be realized only by hardware or only by software.
  • a power storage device, a power storage system, and the like that can realize a long life and efficient use of a power storage device by changing an effective capacity according to the usage status and use environment of the power storage device. Can be provided.
  • FIG. 1 is a block diagram showing the configuration of the power storage system.
  • This power storage system includes a power storage device 8, a solar panel (PV panel) 9, a cloud server 14, and the like.
  • the power storage device 8 includes a storage battery 1, a monitoring unit 2, a blocking unit 3, a charge / discharge unit 4, a charge / discharge control unit 5, and a controller 6. All of these are not necessarily essential components of the present invention.
  • the storage battery 1 has a chargeable / dischargeable secondary battery as a constituent element.
  • the battery may have a plurality of lithium ion secondary batteries.
  • the secondary battery is provided with at least one of a temperature sensor, a voltage sensor, and a current sensor (all not shown).
  • the monitoring unit 2 has an electric circuit, and detects the temperature, voltage, current, etc. of each secondary battery using the detection value of the sensor.
  • the monitoring unit 2 is connected to the blocking unit 3 through the communication line 7 so that information such as temperature, voltage, and current can be used by the blocking unit 3.
  • the shut-off unit 3 has a function of disconnecting the battery at the time of abnormality using at least one data such as temperature, voltage, and current from the monitoring unit 2.
  • the charging / discharging unit 4 is connected to the solar panel 9 and the power line 12 and outputs the power from the power storage device 8 to the external load device 10 or charges the internal storage battery 1. Switch the circuit state. Charging may use power from the grid 11 or may use power from the solar panel 9. The switching of the circuit state may be performed based on a control signal from the charge / discharge control unit 5.
  • the charge / discharge control unit 5 is also connected to the controller 6.
  • the charging / discharging unit 4 has a PCS (Power Conditioning System) function.
  • the PCS function has a function of converting DC power output from the power storage device 8 into AC power usable by the load device 10 or converting AC power supplied from the power line 12 to the power storage device 8 into DC power.
  • the controller 6 has a communication function for communicating with external devices. Although not limited, it may communicate with one or a plurality of servers 14 via a network 13 (for example, the Internet). The controller 6 may communicate with the server 14 periodically or at a predetermined timing as necessary to notify battery information and set values.
  • a network 13 for example, the Internet
  • the controller 6 may include a memory, a processor, and a storage device, and may have a computer program installed.
  • the controller 6 may have a function of storing, reading, and / or changing information on a full charge voltage for charging the secondary battery.
  • the full charge voltage charge end voltage
  • the full charge voltage charge end voltage may be one in which the maximum cell voltage is dominant.
  • the load device 10 is not particularly limited, but is a load arranged in a home or a store.
  • the system 11 may be 200V voltage as an example.
  • the cloud server 14 may be composed of a single computer or may be composed of a plurality of computers and perform distributed processing. Communication between the server 14 and the power storage device 8 may be wired, wireless, or a combination thereof.
  • the power storage device 8 configured as described above can perform various operations. Some examples will be described below. Note that the power storage device 8 only needs to be configured to perform at least one of the following operations, and is not necessarily configured to be able to perform all of the operations.
  • Electricity company electricity charges usually have a price difference between nighttime and daytime, and the magnitude of the price difference may also vary. This will be described with reference to FIG. In the following, specific dates and numerical values will be shown, but these do not limit the present invention.
  • the horizontal axis is the date (time), and the vertical axis is the electricity rate difference ⁇ P (delta P) between day and night.
  • the range from May 1 to May 2 is “area A” in which the price difference is 10 yen (an example) or more.
  • the price difference is “Region B”, which is below 10 yen (an example). After May 7th, it becomes “Area A” with a large charge gap again.
  • the power storage device of this embodiment performs the following operation.
  • FIG. 3 is a flowchart of the first operation example. As a precondition of the flowchart shown in FIG. 3, it is assumed that the region A is in the initial state (state of step S1) in this operation example (for example, May 2). It is assumed that the full charge voltage in the case of region A is 4.1V.
  • the power storage device 8 acquires information on the electricity rate difference ⁇ P in step S2.
  • the controller 6 of the power storage device 8 may communicate with the external cloud server 14 and acquire this information from the server.
  • the timing at which the power storage device 8 acquires information is not particularly limited, but may be set to be periodically performed at predetermined time intervals. For example, it may be configured to automatically acquire information every day at time a, and when the electricity rate may change frequently, the information is automatically acquired several times a day. It may be configured.
  • step S3 the power storage device 8 determines whether or not the electricity rate difference ⁇ P is equal to or greater than a predetermined reference value (in other words, the region A or the region B).
  • a predetermined reference value in other words, the region A or the region B.
  • the area A is determined to be an area A if the electricity rate difference ⁇ P is 10 yen or more, and the area B is determined to be less than 10 yen.
  • step S4 it is determined whether or not the current area is the same as the area determined in step S3. That is, in step S4, the current area is compared with the area determined in step S3. In the case of Yes in step S4 (in this operation example, when the current region is A and the determination is also region A), the process returns to step S2. On the other hand, in the case of No in step S4 (in the present operation example, when the current region is A and the region is determined to be B), the process proceeds to step S5. In step S5, power storage device 8 resets the full charge voltage value. In this operation example, the full charge voltage value is reset from 4.1 V to 4.0 V in step S5.
  • the battery is charged with a full charge voltage of 4.0V.
  • the full charge voltage value is decreased from 4.1 V to 4.0 V.
  • the region B is changed to the region A, the flow is naturally increased from 4.0 V to 4.1 V.
  • Specific numerical values such as “4.0 V” and “4.1 V” do not limit the present invention.
  • “4.0 V” is a relatively low first full charge voltage value, “4. 1V "can also be expressed as a relatively high second full charge voltage value or the like.
  • a predetermined notification may be made so that the user can know the fact.
  • the display unit 20 is connected to the power storage device 8 (or the display unit 20 may be provided integrally with the power storage device 8). You may want to display a simple notification: -Notification that the full charge voltage value will be reset, and / or -Full charge voltage value before and after resetting (in the above example, "4.0 V", "4.1 V"), etc.
  • the display unit 20 is not particularly limited, but various types such as a liquid crystal display and an organic EL display can be used, and the number thereof is not limited to one and may be plural. What controls the display of the display unit 20 may be the power storage device 8 (specifically, the controller 6), the cloud server 14, or the like.
  • a notification prompting the user to decide whether or not to permit resetting is also displayed.
  • the following input from the user may be accepted together with a notification such as “the full charge voltage value is changed from a (V) to b (V)”. : -Touch an icon displayed on the touch panel display. -Pressing a given physical button, -Select the target icon with the cursor on the display, etc.
  • the power storage device 8 When there is such an input, the power storage device 8 resets the full charge voltage value. On the other hand, there was an input from the user indicating “not permitted” (in one example, an icon corresponding to “permitted” and an icon corresponding to “not permitted” may be displayed). In this case, the full charge voltage value may not be reset.
  • the power storage device 8 is set to have a high full charge voltage during a period in which the electricity price difference is large, and a state where the amount of charge and the amount of electricity used is large is promoted. It becomes possible to use the system. Since the switching of the full charge voltage setting is automatically performed by the system, there is no need for the user to perform complicated setting changes. Further, for example, as compared with a case where charging is always performed at 4.1 V (for example, a state in which the full charge voltage is relatively high) in the entire use period of the power storage device 8, according to the present embodiment, the basic In addition, since a period in which charging is performed at a relatively low full charge voltage is included, there is an advantage that the power storage device 8 can be operated with a longer life.
  • the determination is made as to which of “region A” and “region B” corresponds, but of course, more ranks (for example, region A, region B, You may make it determine whether it corresponds to either among the area
  • the region A is charged with 4.1 V
  • the region B is charged with 4.0 V
  • the region C is charged with 3.95 V. Good.
  • controller 6 and the charge / discharge control unit 5 are drawn separately, but naturally they may be configured as one.
  • a control unit control circuit, control module
  • a control unit that has the functions of the controller 6 and the charge / discharge control unit 5 may be provided.
  • the power storage device 8 is configured to store history information of the set full charge voltage (for example, charging at the voltage p1 from when to when and charging at the voltage p2 from when to when) to the storage device. May be.
  • the power storage device may be configured to automatically set the full charge voltage value using, for example, a calculation formula. This will be described with reference to FIGS. 4A, 4B, and 5.
  • FIG. Of course, regarding some operation examples described in this specification, the predetermined operation described in one operation example may be executed in another operation example. As an example, the operation related to notification or the like when resetting the full charge voltage value described in the above operation example is executed in the second operation example (further, the third operation example and other operation examples). It is also possible.
  • the horizontal axis of the graph in FIG. 4A is the date (time), and the vertical axis is the electricity rate gap.
  • the horizontal axis of the graph of FIG. 4B is the date (time), and the vertical axis is the full charge voltage value.
  • the power storage device of this embodiment performs the following operation.
  • the full charge voltage is set to 3.95 V in the initial state (state of step S1) (for example, May 3).
  • the power storage device 8 acquires information related to the electricity rate difference ⁇ P in step S2.
  • the controller 6 of the power storage device 8 may communicate with the external cloud server 14 and acquire this information from the server.
  • the power storage device 8 determines the reset full charge voltage using the acquired information on the electricity rate difference ⁇ P and a calculation formula prepared in advance.
  • the reference voltage Q can be freely set by the user, and is, for example, 4.0V.
  • the magnification Y can also be freely set by the user, for example, 0.1.
  • the reference fee difference ⁇ X can also be set freely by the user, for example, 10 yen.
  • step S3 the power storage device 8 acquires information on the magnification Y, the reference voltage Q, and the reference charge difference ⁇ X defined by the user.
  • these pieces of information may be stored in a predetermined storage device (not shown) in the power storage device, and information may be obtained by reading from the information.
  • step S4 the power storage device 8 calculates the reset full charge voltage using the acquired information and the above calculation formula.
  • step S5 the calculated reset full charge voltage value is set to the full charge voltage.
  • the storage battery is then charged at the set full charge voltage.
  • the series of operations described above is not limited, but may be performed once a day, or may be performed several times a day when fluctuations in electricity charges may occur frequently. It may come to be.
  • a suitable full charge voltage can be set more precisely based on the calculation formula than in the case of the first operation example. Moreover, when it is comprised so that a user can reset at least 1 of the parameter of a calculation formula to arbitrary values, the setting of the full charge voltage according to a user's intention becomes possible.
  • a settable upper limit voltage as an upper limit and a settable lower limit voltage as a lower limit are set in advance. That is, in the calculation, the upper limit voltage is set when the settable upper limit voltage is exceeded, and / or the lower limit voltage is set when the settable lower limit voltage is exceeded. According to this, since the full charge voltage is set within an appropriate range, it is possible to prevent the performance of the storage battery from being deteriorated by setting an inappropriate full charge voltage.
  • step S1 the power storage device 8 detects the full charge of the storage battery and discharges it during the day.
  • step S2 night charging is performed.
  • step S3 it is determined whether or not the discharge terminal voltage has been reached during the day. That is, the power storage device 8 acquires information on the voltage of the storage battery at the time when the discharge time period ends, and determines whether or not the voltage is less than the discharge terminal voltage. If YES in step S3, the process returns to step S1.
  • step S4 it is determined whether or not such a situation has continued for a predetermined number of days or more (for example, 30 days or more). If NO, the process returns to step S1. In the case of YES, in step S5, the full charge voltage is reduced and set by a predetermined value (for example, 0.05 V reduction).
  • the following advantages can be obtained. That is, it can be considered that the storage battery is charged more than the necessary amount that the storage battery does not reach the discharge terminal voltage. Therefore, in such a case, by setting the full charge voltage by reducing it by a predetermined value, the amount of charge of the storage battery can be optimized, thereby contributing to the extension of the life of the power storage device.
  • the power storage device may be configured to acquire information on the consumption tendency of the storage battery, use the information, and set the full charge voltage to be higher or lower correspondingly.
  • the “information regarding the consumption trend of the storage battery” may be any information, and examples thereof include information regarding the weather and information such as the power consumption trend for each day of the user.
  • the power storage device acquires the weather forecast information for the next day from an external server or the like, and according to “sunny”, “cloudy”, “rain”, etc.
  • the full charge voltage value corresponding to it may be configured to be automatically set. Further, based on information related to “air temperature”, a full charge voltage value corresponding to the information may be automatically set. Specifically, for example, when the current full charge voltage is set to 4.1 V and the next day is predicted to be “clear”, the setting value is lowered and reset to 3.9 V. It may be a configuration.
  • the setting of the full charge voltage based on such information regarding weather may be configured to be implemented by the power storage device, it is not necessarily limited thereto.
  • information processing has already been performed on the external server side, and only the result (that is, information on the full charge voltage to be set) is sent to the power storage device, and the full charge voltage is set to that value on the power storage device side. It may be configured to redo.
  • This registration is not limited, but may be performed using a controller, HEMS, PC connection, or the like.
  • the contents may be information such as absence / at-home information and consumption increase designation.
  • the information may be that there is no power consumption on a specific day, or there is little or more power consumption. Since the configuration is such that the full charge voltage on a specific day (date, day of the week, etc.) is set low or high, the power storage device can be used more efficiently.
  • nighttime charging may not be performed during the absence registration period, and the solar power generated during the day may be used for charging the storage battery.
  • a power storage device including a chargeable / dischargeable storage battery and a control unit configured to control a charging operation of the storage battery and communicate with an external device, wherein the control unit includes: Disclosed is a power storage device that is configured to set a full charge voltage based on a difference in power price between day and night or a usage situation. Further, each invention as described below is disclosed.
  • a power storage device comprising: The control unit a1: Obtain information on the difference in power prices ( ⁇ P) between day and night, a2: It is determined whether the price difference is large by comparing the difference ( ⁇ P) in the power price with a predetermined reference value, a3: When the price difference is large, the full charge voltage for charging the storage battery is set to a relatively high value, a4: When the price difference is small, the full charge voltage for charging the storage battery is set to a relatively low value.
  • a power storage device configured as described above.
  • the control unit determines whether the price difference is large based on a criterion as to which of the plurality of ranks corresponds, and a full charge voltage value is set in advance corresponding to each of the plurality of ranks.
  • control unit acquires the information related to the difference in power price ( ⁇ P) from an external device via a network.
  • a power storage system comprising:
  • a power storage device configured as described above.
  • the above information on battery consumption trends (I) Information about the weather, or (Ii) The power storage device as described above, which is information on a power consumption tendency of each user day of the week.
  • the present application also discloses an invention relating to the above-described power storage device or power storage system as a method invention or a computer program invention.
  • A5-1 A rechargeable storage battery (1);
  • a control unit (5, 6) configured to control the charging operation of the storage battery and communicating with an external device;
  • a method that can be implemented using a power storage device comprising: a1: obtaining information on the difference in power price between day and night ( ⁇ P); a2: a step of calculating a full charge voltage for charging the storage battery using information on the difference between the power prices and a calculation formula prepared in advance; a3: setting the calculated full charge voltage as a full charge voltage for charging the storage battery; Having a method.
  • a control unit (5, 6) configured to control the charging operation of the storage battery and communicating with an external device;
  • a method that can be implemented using a power storage device comprising: a1: obtaining information on the remaining battery level of the storage battery after use; a2: using the information, determining whether or not the discharge time period has ended without reaching the end-of-discharge voltage; a3: determining whether or not the end of the discharge time period without reaching the end-of-discharge voltage continues for a predetermined period; a4: A value that is lower than the current full charge voltage for the full charge voltage for charging the storage battery when the end of the discharge time period has not been reached without reaching the final discharge voltage for a predetermined period of time. Step to set to Having a method.
  • a control unit (5, 6) configured to control the charging operation of the storage battery and communicating with an external device;
  • a method that can be implemented using a power storage device comprising: a1: a step of acquiring information relating to the consumption tendency of the storage battery; a2: using the information, determining whether or not a predetermined date or a predetermined day of the week consumes less storage battery; a3: a step of setting a full charge voltage for charging the storage battery to a relatively low value when it is determined that the storage battery is consumed on a predetermined date or a predetermined day of the week; Having a method.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Cet appareil de stockage comprend : une batterie rechargeable (1) capable de charger et de décharger ; et des unités de commande (5, 6) qui sont configurées de façon à commander l'opération de charge de la batterie rechargeable, et qui réalisent une communication avec des dispositifs externes. L'unité de commande est configurée de manière à : a1 : acquérir des informations relatives à la différence de prix d'électricité (∆P) entre le jour et la nuit ; a2 : en comparant cette différence de prix d'électricité (∆P) avec une valeur de référence prescrite, déterminer si la différence de prix est importante ; a3 : lorsque la différence de prix est importante, régler la tension de pleine charge pour charger la batterie rechargeable à une valeur relativement élevée ; et a4 : lorsque la différence de prix est faible, régler la tension de pleine charge pour charger la batterie rechargeable à une valeur relativement basse.
PCT/JP2017/033709 2016-09-20 2017-09-19 Appareil de stockage, système de stockage et procédé de commande de charge WO2018056258A1 (fr)

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JP2016-183116 2016-09-20
JP2016183116 2016-09-20

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051481A (ja) * 1992-04-24 2002-02-15 Adc Technology Kk エネルギ制御装置
JP2002359008A (ja) * 2001-03-28 2002-12-13 Japan Storage Battery Co Ltd 二次電池の運用方法及び二次電池装置
WO2011142114A1 (fr) * 2010-05-10 2011-11-17 パナソニック株式会社 Dispositif de commande, système de stockage de charge, procédé de commande et programme informatique
JP2012147600A (ja) * 2011-01-13 2012-08-02 Kansai Electric Power Co Inc:The 電力貯蔵装置が備える蓄電池の放電方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002051481A (ja) * 1992-04-24 2002-02-15 Adc Technology Kk エネルギ制御装置
JP2002359008A (ja) * 2001-03-28 2002-12-13 Japan Storage Battery Co Ltd 二次電池の運用方法及び二次電池装置
WO2011142114A1 (fr) * 2010-05-10 2011-11-17 パナソニック株式会社 Dispositif de commande, système de stockage de charge, procédé de commande et programme informatique
JP2012147600A (ja) * 2011-01-13 2012-08-02 Kansai Electric Power Co Inc:The 電力貯蔵装置が備える蓄電池の放電方法

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