JPWO2016157740A1 - Storage battery unit and power storage system - Google Patents

Abstract

The storage battery unit (10) includes a plurality of storage battery modules (20) and a power supply unit (31). Each of the plurality of storage battery modules (20) includes a storage battery (21a) and a communication unit (22) that transmits information regarding at least one of charging and discharging of the storage battery (21a). The storage battery (21a) is electrically connected to form a storage battery group (21). The power supply unit (31) is electrically connected to the plurality of storage battery modules (20), receives the both-end voltage (the combined voltage V0) of the storage battery group (21) as an input, and the plurality of storage battery module (20) communication units ( Drive power is supplied to each of 22).

Description

  The present invention generally relates to a storage battery unit, and more particularly, to a storage battery unit and a power storage system including a communication unit for each storage battery module.

  Conventionally, in a storage battery unit in which a plurality of storage battery modules are electrically connected in series, in each of the storage battery modules, a circuit included in the storage battery module is supplied with power from the storage battery of the storage battery module ( Patent Document 1).

  In Patent Document 1, an assembled battery unit (storage battery module) includes an assembled battery in which a plurality of battery cells (cells) are connected in series and a monitoring device, and the monitoring device uses electric power generated by voltage output from the assembled battery. Receive supply.

JP 2013-102657 A

  In the technique described in Patent Document 1, when there are variations in the operation state, operation conditions, components, etc. of the circuits provided in each of the monitoring devices, the power consumed in each storage battery module (assembled battery unit) varies. Arise. Therefore, the remaining amount of electric energy charged in the cells of each storage battery module will vary, and the storage battery module cannot be used efficiently.

  Then, this invention is made | formed in view of the said reason, The objective is to provide the storage battery unit and electrical storage system which can use a storage battery module efficiently.

  A storage battery unit according to an aspect of the present invention includes a plurality of storage battery modules and a power supply unit, and each of the plurality of storage battery modules transmits information related to the storage battery and at least one of charging and discharging of the storage battery. Each storage battery is electrically connected to form a storage battery group, and the power supply unit is electrically connected to the plurality of storage battery modules, and inputs a voltage across the storage battery group. And driving power is supplied to each of the communication units of the plurality of storage battery modules.

  A power storage system according to one embodiment of the present invention includes the above-described storage battery unit and a power conditioner that communicates with the storage battery unit, and the power conditioner controls charging and discharging of the storage battery. It is said.

  According to the storage battery unit and the storage system of the present invention, the storage battery module can be used efficiently.

FIG. 1 is a diagram illustrating the configuration of the power storage system according to the first embodiment. FIG. 2 is a diagram for explaining the configuration of the power storage system when power is supplied to a part of the communication unit of the storage battery module.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, components, arrangement of components, connection forms, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same component.

(Embodiment 1)
Hereinafter, the storage battery unit 10 in this embodiment is demonstrated using FIG.

  FIG. 1 is a diagram illustrating a configuration of a power storage system 1 according to the first embodiment.

  As shown in FIG. 1, the power storage system 1 in this embodiment includes a storage battery unit 10 and a power conditioner 50. The storage battery unit 10 is installed in a facility such as a house. A power conditioner 50 is installed in the facility. The power conditioner 50 uses the power supplied from the commercial power supply 51 to charge and discharge the plurality of storage battery modules 20 provided in the storage battery unit 10 (specifically, the storage batteries included in each of the plurality of storage battery modules 20). 21a is a device for controlling the charging and discharging of 21a. The storage battery unit 10 communicates with the power conditioner 50 and transmits / receives data (information) regarding at least one of charging and discharging of the plurality of storage battery modules 20.

  The storage battery unit 10 supplies charged power to a load (not shown) in the facility under the control of the power conditioner 50 when power supply from the commercial power source 51 cannot be received during a power failure or the like. To do.

  As shown in FIG. 1, the storage battery unit 10 includes a communication relay unit 30 in addition to the plurality of storage battery modules 20. As shown in FIG. 1, each of the plurality of storage battery modules 20 includes a storage battery 21 a and a communication unit 22.

  The storage battery 21a is composed of a plurality of cells 21b connected in series. The cell 21b is, for example, a lithium ion battery. From each storage battery 21a, the output voltage of the total value of the both-ends voltage of the some cell 21b is output.

  Moreover, the some storage battery module 20 is connected in series. Specifically, as shown in FIG. 1, the storage batteries 21 a are connected in series to constitute one storage battery group 21. The both-ends voltage V0 of the storage battery group 21 in which the storage batteries 21a are connected in series is input to the communication relay unit 30. The both-ends voltage V0 of the storage battery group 21 is a voltage obtained by adding the output voltages output from the storage batteries 21a. The voltage value of the both-ends voltage V0 (hereinafter also referred to as “composite voltage V0”) of the storage battery group 21 is, for example, 93V. In addition, this numerical value is an example, Comprising: It is not the meaning limited to this numerical value. Moreover, in this embodiment, each cell 21b which comprises the some storage battery 21a is made into the battery of the same kind and the same performance on the specification.

  The communication unit 22 has a plurality of circuit blocks. Specifically, the communication unit 22 includes a data control unit 23 and a communication control unit 24 as circuit blocks as shown in FIG.

  The data control unit 23 includes a processor that operates according to a program as a main hardware element, acquires data related to the storage battery 21a, and transmits the acquired data to the communication relay unit 30. For example, the data control unit 23 acquires battery temperature data of the storage battery 21 a measured by a temperature sensor provided in the storage battery module 20, and the acquired data (battery temperature) is transmitted via the communication control unit 24 to the communication relay unit 30. It transmits to (the 1st communication part 32 mentioned later). The processor constituting the data control unit 23 may have any form such as a microcomputer integrated with a memory, a configuration independent of the memory, or the like.

  The communication control unit 24 transmits the data (battery temperature) acquired by the data control unit 23 to the communication relay unit 30. For example, the communication control unit 24 includes a communication driver for performing data communication in accordance with the RS485 standard and a communication interface determined in accordance with the RJ45 standard. The communication driver outputs the data (battery temperature) received from the data control unit 23 to the communication interface. The communication interface transmits the received data (battery temperature) to the communication relay unit 30.

  In addition, the communication control unit 24 performs communication with other storage battery modules 20. Thereby, for example, one storage battery module 20 among the plurality of storage battery modules 20 collects data (battery temperature) of the other storage battery module 20, and the one storage battery module 20 collects the data collectively to the communication relay unit 30. Can be sent.

  As shown in FIG. 1, the communication relay unit 30 includes a power supply unit 31, a first communication unit 32, a control unit 33, and a second communication unit 34.

  The power supply unit 31 is electrically connected to the plurality of storage battery modules 20, specifically, the storage battery group 21 in which the storage batteries 21 a are connected in series. The power supply unit 31 receives the voltage across the storage battery group 21 (the combined voltage V0) and supplies the power obtained based on the combined voltage V0 to the communication units 22 of the plurality of storage battery modules 20. The power supply unit 31 supplies power obtained based on the combined voltage V0 to the first communication unit 32, the control unit 33, and the second communication unit 34. Specifically, the power supply unit 31 includes a first step-down unit 41 and a second step-down unit 42 as shown in FIG. The first step-down unit 41 is a transformer and steps down the combined voltage V0 that is an input from the plurality of storage battery modules 20 to generate the first voltage V1, and the generated first voltage V1 is supplied to the control unit 33 and the second communication. To the unit 34. For example, the first step-down unit 41 steps down the combined voltage V0 (93V) to 12V. The second step-down unit 42 is a transformer, further reduces the voltage stepped down by the first step-down unit 41 to generate the second voltage V2, and uses the generated second voltage V2 as the first communication unit 32 and the plurality of storage batteries. The data is output to the communication unit 22 of each module 20. For example, the second step-down unit 42 steps down the voltage (12V) stepped down by the first step-down unit 41 to 5V. In addition, these numerical values are an example, Comprising: It is not the meaning limited to these numerical values.

  The first communication unit 32 transmits / receives data to / from each of the plurality of storage battery modules 20.

  The control unit 33 includes a processor that operates according to a program as a main hardware element, and controls the entire communication relay unit 30. This type of processor may take any form such as a microcomputer integrated with a memory, a configuration independent of the memory, and the like. The control unit 33 causes the first communication unit 32 to transmit the data received from the power conditioner 50 via the second communication unit 34 (for example, information instructing acquisition of the battery temperature) to each storage battery module 20. The first communication unit 32 is controlled. Further, the control unit 33 controls the second communication unit 34 so that the second communication unit 34 transmits the data (battery temperature) received by the first communication unit 32 from the storage battery module 20 to the power conditioner 50. .

  The second communication unit 34 transmits / receives data to / from the power conditioner 50.

  When the power conditioner 50 receives data from the storage battery unit 10, the power conditioner 50 controls charging / discharging of each storage battery 21a according to the received data. For example, when the received data is the battery temperature of the storage battery 21a, at least one of the charging current and the charging voltage of each storage battery 21a is controlled so as to charge with the amount of power corresponding to the battery temperature.

  In addition, although the power supply part 31 mentioned above was the structure which steps down the synthetic | combination voltage V0 input from the storage battery group 21, it is not limited to this. The power supply unit 31 may be configured to boost the combined voltage V0.

(Modification)
Although the power supply part 31 of the storage battery unit 10 demonstrated in the said Embodiment 1 supplied the electric power obtained based on the synthesized voltage V0 to each communication part 22 whole of each storage battery module 20, it is not limited to this.

  For example, the power supply unit 31 may supply power obtained based on the combined voltage V <b> 0 to a part of each communication unit 22 of each storage battery module 20.

  As an example of this case, the case where the power supply unit 31 supplies power obtained based on the combined voltage V0 to the communication control unit 24 of each communication unit 22 is different from the first embodiment with reference to FIG. The explanation will be focused on. In this modification, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  FIG. 2 is a diagram illustrating a configuration of the power storage system 1 when power is supplied to a part of the communication unit 22 of the storage battery module 20.

  As shown in FIG. 2, the storage battery module 20 further includes a voltage conversion unit 25. The voltage conversion unit 25 is, for example, a DCDC converter. The voltage conversion unit 25 is electrically connected to the storage battery 21a, steps down the voltage input from the storage battery 21a, stabilizes the voltage, and outputs the stabilized voltage to the data control unit 23. As a result, the data control unit 23 can operate without receiving power from the power supply unit 31.

  The power supply unit 31 included in the communication relay unit 30 generates electric power obtained based on the second voltage V2 that is the output voltage of the second step-down unit 42 with each communication control unit 24 of the plurality of storage battery modules 20 and the first voltage V2. To the communication unit 32.

  In the present modification, the power supply destination of the power supply unit 31 is the communication control unit 24 as a part of the communication unit 22, but is not limited thereto. As a part of the communication unit 22 to which the power supply unit 31 supplies power, only the data control unit 23 or only the communication driver included in the communication control unit 24 may be used. Only the included communication interface may be used. Alternatively, as a part of the communication unit 22 to which the power supply unit 31 supplies power, the data control unit 23 and a communication driver included in the communication control unit 24 may be combined, or the data control unit 23 and the communication control unit 24 may be a pair with a communication interface included in 24. Of the data control unit 23 and the communication control unit 24 constituting the communication unit 22, components that are not supplied with power from the power supply unit 31 are electrically connected to the storage battery 21 a via the voltage conversion unit 25. . And the component which does not receive power supply from the power supply part 31 receives power supply via the voltage conversion part 25 from the storage battery 21a. Further, as a part of the communication unit 22 to which the power supply unit 31 supplies power, a part of the data control unit 23 or a part of the communication control unit 24 may be used.

  Although the above-described power conditioner 50 controls the charging and discharging of the plurality of storage battery modules 20 using the power supplied from the commercial power supply 51 in cooperation with the commercial power supply 51, the present invention is not limited to this. The power conditioner 50 may control charging and discharging of the plurality of storage battery modules 20 using power supplied from the solar battery in cooperation with the solar battery. Further, the power conditioner 50 controls the charging and discharging of the plurality of storage battery modules 20 using electric power other than the commercial power source 51 and the solar battery, for example, electric power generated using natural energy such as wind power, hydraulic power, and geothermal heat. May be performed.

(Summary)
As described above, the storage battery unit 10 according to one aspect of the present invention includes the plurality of storage battery modules 20 and the power supply unit 31. Each of the plurality of storage battery modules 20 includes a storage battery 21a and a communication unit 22 that transmits information regarding at least one of charging and discharging of the storage battery 21a. The storage battery 21 a is electrically connected to form a storage battery group 21. The power supply unit 31 is electrically connected to the plurality of storage battery modules 20, and receives driving voltage (combined voltage V 0) of the storage battery group 21 as input and supplies driving power to each communication unit 22 of the plurality of storage battery modules 20. To do.

  According to this configuration, in the storage battery unit 10, the voltage across the storage battery group 21 (the combined voltage V 0) is temporarily input to the power supply unit 31, and the power supply unit 31 supplies driving power to each communication unit 22. Therefore, variation in the voltage of the storage battery module 20 due to the difference in power consumption of each storage battery module 20 due to the operation state, operation conditions, parts, and the like of each communication unit 22 can be suppressed. That is, the storage battery unit 10 can make each stored power of the storage battery module 20 as uniform as possible. Therefore, during charging, the amount of electric power that can be charged (stored) in the storage battery unit 10 (storage battery group 21) can be increased as much as possible. Moreover, the amount of electric power that can be discharged by the storage battery unit 10 (storage battery group 21) can be increased as much as possible during discharging as well as during charging. Therefore, the storage battery unit 10 can use the storage battery module 20 efficiently.

  Here, the power supply unit 31 steps down the input voltage across the storage battery group 21 (the combined voltage V0), and supplies drive power obtained by the stepped down voltage to each communication unit 22 of the plurality of storage battery modules 20. Is preferred.

  According to this configuration, the storage battery unit 10 can supply appropriate power to the communication unit 22 of the storage battery module 20 in order for the communication unit 22 to operate.

  Here, the communication unit 22 includes a plurality of circuit blocks (for example, the data control unit 23 and the communication control unit 24). It is preferable that the power supply unit 31 supplies driving power to all circuit blocks that constitute the communication units 22 of the plurality of storage battery modules 20.

  According to this configuration, the storage battery unit 10 supplies driving power to the entire communication unit 22. Therefore, it is possible to further suppress the variation in the voltage of the storage battery module 20 as compared with the case where driving power is supplied to a part of the communication unit 22.

  Here, the communication unit 22 includes a plurality of circuit blocks (for example, the data control unit 23 and the communication control unit 24). Each of the plurality of storage battery modules 20 further includes a voltage conversion unit 25. The power supply unit 31 supplies driving power to at least one circuit block constituting each communication unit 22 of the plurality of storage battery modules 20. The voltage conversion unit 25 receives the output voltage of the storage battery 21a as input, steps down the output voltage, and supplies the power obtained by the stepped down voltage to the remaining circuit blocks of the communication unit 22 that are not supplied with driving power. preferable.

  According to this configuration, the storage battery unit 10 supplies driving power to a part of the communication unit 22, so that the storage battery module 20 can be compared with a case where power is directly supplied from the storage battery to the entire communication unit as in the past. It is possible to suppress variation in voltage. Further, when driving power is supplied to the entire communication unit 22, there is a difference between the voltage of the storage battery 21 a and the voltage output from the power supply unit 31, so that an insulator is provided between the storage battery 21 a and the communication unit 22. It is necessary to provide. On the other hand, when driving power is supplied to a part of the communication unit 22, the voltage converter 25 steps down the output voltage of the storage battery 21 a, so the difference from the voltage of the power supply unit 31 is smaller than the former. Therefore, it becomes easier to install an insulator than the former.

  The power storage system 1 according to one embodiment of the present invention includes the storage battery unit 10 and a power conditioner 50 that communicates with the storage battery unit 10. The power conditioner 50 controls charging and discharging of the storage battery 21a.

  According to this configuration, in the power storage system 1, the voltage across the storage battery group 21 (the combined voltage V 0) is once input to the power supply unit 31, and the power supply unit 31 supplies driving power to each communication unit 22. Therefore, variation in the voltage of the storage battery module 20 due to the difference in power consumption of each storage battery module 20 due to the operation state, operation conditions, parts, and the like of each communication unit 22 can be suppressed. That is, the power storage system 1 can make each stored power of the storage battery module 20 as uniform as possible. Therefore, during charging, the amount of electric power that can be charged (stored) in the storage battery unit 10 (storage battery group 21) can be increased as much as possible. Moreover, the amount of electric power that can be discharged by the storage battery unit 10 (storage battery group 21) can be increased as much as possible during discharging as well as during charging. Further, the power conditioner 50 can control charging and discharging of the storage battery 21a according to the state of the storage battery module 20 (for example, the temperature of the storage battery 21a). Therefore, variation in the voltage of the storage battery module 20 due to a difference in the state (for example, temperature) of each storage battery 21a can be suppressed. That is, the power storage system 1 can make each stored power of the storage battery module 20 as uniform as possible. Therefore, the power storage system 1 can use the storage battery module 20 efficiently.

  As mentioned above, although the storage battery unit 10 and the electrical storage system 1 which concern on this invention were demonstrated based on the said embodiment, this invention is not limited to said embodiment. Forms obtained by subjecting various embodiments to various modifications conceived by those skilled in the art, and forms realized by arbitrarily combining components and functions in the embodiments within the scope of the present invention are also included in the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Power storage system 10 Storage battery unit 20 Storage battery module 21 Storage battery group 21a Storage battery 22 Communication part 25 Voltage conversion part 31 Power supply part

Claims (5)

A plurality of storage battery modules and a power supply unit;
Each of the plurality of storage battery modules includes a storage battery and a communication unit that transmits information on at least one of charging and discharging of the storage battery,
Each storage battery is electrically connected to form a storage battery group,
The power supply unit is electrically connected to the plurality of storage battery modules, and receives the voltage across the storage battery group as input, and supplies driving power to the communication unit of each of the plurality of storage battery modules. Storage battery unit. The power supply unit steps down the input voltage across the storage battery group, and supplies the driving power obtained by the stepped down voltage to each of the communication units of the plurality of storage battery modules. The storage battery unit according to 1. The communication unit is composed of a plurality of circuit blocks,
The storage battery unit according to claim 1, wherein the power supply unit supplies the driving power to all circuit blocks that constitute the communication unit of each of the plurality of storage battery modules. The communication unit is composed of a plurality of circuit blocks,
Each of the plurality of storage battery modules further includes a voltage conversion unit,
The power supply unit supplies the driving power to at least one circuit block that constitutes the communication unit of each of the plurality of storage battery modules.
The voltage conversion unit receives the output voltage of the storage battery, steps down the output voltage, and supplies power obtained by the stepped down voltage to the remaining circuit blocks that are not supplied with the driving power in the communication unit. The storage battery unit according to claim 1 or 2. The storage battery unit according to any one of claims 1 to 4,
A power conditioner communicating with the storage battery unit,
The power conditioner controls charging and discharging of the storage battery.

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