WO2019188888A1

WO2019188888A1 - Electricity storage system, sensor module, and control method for electricity storage system

Info

Publication number: WO2019188888A1
Application number: PCT/JP2019/012332
Authority: WO
Inventors: 崇弘望月; 凌古川
Original assignee: 古河電気工業株式会社; 古河電池株式会社
Priority date: 2018-03-26
Filing date: 2019-03-25
Publication date: 2019-10-03
Also published as: CN112042044A; JP7189937B2; JPWO2019188888A1

Abstract

The present invention suppresses, in an electricity storage system provided with a plurality of sensor modules respectively for measuring the states of a plurality of storage battery cells, variations in characteristic between the storage battery cells. An electricity storage system (100) is characterized by being provided with: a plurality of storage battery cells (5); a sensor module (4) which is provided to correspond to each of the plurality storage of battery cells, operates by power supply from the storage battery cell corresponding thereto, and measures the state of the storage battery cell corresponding thereto; and a monitoring device (2) which transmits, to each of the sensor modules, a measurement request indicating execution of measurement of the state of the storage battery cell and a data request indicating transmission of a measurement result, the sensor module having, as an operation mode, a sleep mode in which part of the function thereof is restricted, and an active mode in which the restriction of part of the function thereof is cancelled, and being brought into the active mode for a designated period, and brought into the sleep mode for periods other than the designated period.

Description

Electric storage system, sensor module, and electric storage system control method

The present invention relates to a power storage system, a sensor module, and a control method for the power storage system, for example, a power storage system including a sensor module that measures the state of a lead storage battery and the sensor module.

In recent years, due to demands for large capacity storage batteries, a large storage battery module with a plurality of parallel storage battery modules connected in parallel to a single storage battery cell (single battery) such as a lead storage battery or a plurality of storage battery cells connected in series Large scale power storage systems are spreading.

In such a power storage system, the state of the storage battery is monitored using a sensor. For example, Patent Document 1 includes a sensor module of a slave unit that measures the state of each storage battery cell, and a sensor module of a master unit that relays communication between the sensor module of each slave unit and a higher-level device. A power storage system is disclosed.

Japanese Patent No. 5403191

In the conventional power storage system described above, each sensor module includes, for example, an MCU (micro control unit) in addition to sensors such as a voltage sensor that measures the voltage of the storage battery cell and a temperature sensor that measures the surface temperature of the storage battery cell. And a semiconductor integrated circuit device such as a wireless IC (Integrated Circuit).

Further, each sensor module of the slave unit is provided corresponding to each storage battery cell, and is operated by power feeding from the corresponding storage battery cell. That is, each sensor module operates by consuming the storage battery capacity of the corresponding storage battery cell.

Generally, it is known that current consumption (power consumption) varies in a semiconductor integrated circuit device. For example, semiconductor integrated circuit devices such as MCUs and wireless ICs applied to the sensor module described above vary in power consumption by a few percent, and by a large one, more than that. For this reason, in the above-described power storage system, power consumption varies between sensor modules provided for each storage battery cell.

The variation in power consumption between sensor modules causes variation in characteristics between storage battery cells that supply power to the sensor modules. For example, variation in power consumption between sensor modules contributes to variation in remaining capacity (charged state, SOC: State Of Charge) between storage battery cells.

In this way, when charging / discharging of the storage battery cells is repeated in a state where the SOC between the storage battery cells varies, a storage battery cell that is overcharged or overdischarged occurs, which causes deterioration of the storage battery cell.

In addition, this SOC variation can be eliminated by the equal charge periodically performed in the power storage system, but the equal charge is performed only at a specific time determined in the operation of the system. If the SOC varies in the meantime, the above-mentioned storage battery cell will be deteriorated.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide characteristics between a plurality of storage battery cells in a power storage system including a plurality of sensor modules that respectively measure the states of the plurality of storage battery cells. It is to suppress the variation of the.

A power storage system according to a representative embodiment of the present invention is provided corresponding to each of a plurality of storage battery cells and each of the plurality of storage battery cells, and operates by supplying power from the corresponding storage battery cell. A sensor module for measuring the state of the storage battery cell, and a monitor for transmitting a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of a measurement result to each of the sensor modules. The sensor module has, as operation modes, a sleep mode in which some functions are restricted and an active mode in which some functions are released, and the active operation is performed during a specified period. Mode, and the sleep mode is entered in other periods.

According to the power storage system of the present invention, it is possible to suppress variations in characteristics among a plurality of storage battery cells.

It is a figure which shows the structure of the electrical storage system which concerns on Embodiment 1. FIG. 2 is a diagram illustrating a configuration of a sensor module in the power storage system according to Embodiment 1. FIG. 4 is a timing chart showing the timing of communication between the monitoring device and each sensor module in the power storage system according to Embodiment 1. It is a figure which shows the outline | summary of the switching of the operation mode of the sensor module which concerns on Embodiment 1. FIG. 4 is a timing chart showing switching timing of operation modes of each sensor module in the power storage system according to Embodiment 1. 6 is a diagram illustrating a configuration of a power storage system according to Embodiment 2. FIG. 6 is a timing chart showing switching timing of operation modes of sensor modules for each group in the power storage system according to the second embodiment. 6 is a timing chart when packet re-transmission processing is not performed in each sensor module in the power storage system according to the second embodiment. 9 is a timing chart when a packet retransmission process is performed in each sensor module in the power storage system according to the second embodiment. 6 is a diagram showing a configuration of a sensor module in an electricity storage system according to Embodiment 3. FIG. 10 is a diagram for explaining an operation mode of a sensor module in the power storage system according to Embodiment 3. FIG. 12 is a timing chart showing timings for switching operation modes of the sensor modules in the power storage system according to Embodiment 3. FIG. 10 is a diagram showing a configuration of a sensor module in a power storage system according to Embodiment 4. FIG. 10 is a diagram for explaining a method for adjusting a period during which a sensor module is in an active mode in the power storage system according to the fourth embodiment.

1. First, an outline of a typical embodiment of the invention disclosed in the present application will be described. In the following description, as an example, reference numerals on the drawings corresponding to constituent elements of the invention are shown in parentheses.

[1] A power storage system (100, 100A to 100C) according to a typical embodiment of the present invention corresponds to a plurality of storage battery cells (5, 5_1 to 5_n, 5_1 to 5_k) and the plurality of storage battery cells. The sensor module (4, 4B, 4C) that operates by supplying power from the corresponding storage battery cell and measures the state of the corresponding storage battery cell, and for each of the sensor modules, And a monitoring device (2) for transmitting a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of the measurement result. The sensor module has a part of functions as an operation mode. A restricted sleep mode and an active mode in which the restriction of some of the functions is released, and the active mode is entered during a specified period. Wherein said that the sleep mode period other than.

[2] In the power storage system (100A), the sensor modules are classified into a plurality of groups (6_1 to 6_j), and a common period for entering the active mode is designated for each of the classified groups. Good.

[3] In the power storage system, the sensor module receives a measurement request for instructing measurement of the state of the storage battery cell from the monitoring device (tk1) and a processing time required for measurement according to the measurement request ( The scheduled time for receiving from the monitoring device a data request for instructing transmission of measurement data including a measurement result of measurement corresponding to the measurement request while operating in the active mode in the first active period (Ta1) including Tk1). (T2) and a second active period (Ta2) including a processing time (Tk2) required for transmitting the measurement data in response to the data request, the first active period and the second active period are operated in the active mode. You may operate | move in the said sleep mode in periods other than a period.

[4] In the power storage system, the first active periods of the sensor modules are set to be equal to each other, and the second active periods of the sensor modules are set to be equal to each other. May be.

[5] In the power storage system (100B), the monitoring device outputs a synchronization signal (Vs), and the sensor modules (4B, 4B_1 to 4B_n) switch the operation mode based on the synchronization signal. You may keep time.

[6] In the power storage system (100B), the measurement request includes the synchronization signal, and the monitoring device transmits the measurement request to the sensor modules (4B) all at once. The operation mode includes an operation mode including the active mode and the sleep mode, and an initial activation mode in which the restriction on some of the functions is released, and the sensor module is activated in the initial activation mode, When a signal instructing execution of the measurement is received in the initial activation mode, timing for switching the operation mode may be started, and the operation mode may be switched from the initial activation mode to the operation mode. .

[7] In the power storage system (100C), the monitoring device calculates a correction time (Tc) based on the state of charge of the storage battery cell, and transmits the correction time (Tc) to the sensor module. Based on this, the preset period of the active mode may be changed.

[8] A power storage system (100, 100A to 100C) according to another typical embodiment of the present invention is provided corresponding to each of the plurality of storage battery cells (5) and the plurality of storage battery cells. The sensor module (4, 4B, 4C) for measuring the state of the storage battery cell, and the transmission of the measurement request and the measurement result for instructing the execution of measurement of the state of the storage battery cell to each of the sensor modules And a monitoring device (2) for transmitting a data request to be transmitted, wherein the monitoring device transmits the measurement request to the sensor modules all at once.

[9] The sensor module (4, 4B, 4C) for measuring the state of the storage battery cell (5) according to a representative embodiment of the present invention includes a sleep mode in which some functions are limited, And an active mode in which restrictions on the functions of the units are released. The active mode is set during a designated period, and the sleep mode is set during other periods.

[10] In the sensor module, a sensor unit (40) for detecting the state of the storage battery, a communication device (41) for communicating with the external device (3, 2), and a data processing device ( 42), and the data processing device switches the operation mode based on the time measured by the timer (423) and the time measured by the timer, and controls the communication device and the sensor unit. And the calculation control unit stops the communication device and part of the function of the data processing device in the sleep mode, and stops the measurement time of the timer during the sleep mode. Switches the operation mode from the sleep mode to the active mode when the time coincides with the first determination reference time (ts1, ts2) When the function of the data processing device that has been stopped is restored and the communication device is activated, and the measurement time of the timer matches the second determination reference time (te1, te2) in the active mode, The active mode may be switched to the sleep mode.

[11] In the sensor module (4B), the timer may measure time in synchronization with a synchronization signal (Vs) input from the outside of the sensor module.

[12] In the sensor module (4B), the operation mode includes an operation mode including the active mode and the sleep mode, and an initial activation mode in which the restriction on some of the functions is released, and the calculation The controller sets the operation mode to the initial activation mode after activation of the sensor module, and activates the operation mode when the measurement request instructing measurement of the state of the storage battery cell is received in the initial activation mode. While switching from the mode to the operation mode, timing for switching the operation mode may be started.

[13] In the sensor module (4C), the second determination reference time of the timer is based on a correction time (Tc) calculated based on a state of charge of the storage battery cell to be measured by the sensor module. It may be changeable.

[14] A method according to a representative embodiment of the present invention is provided corresponding to each of the plurality of storage battery cells and each of the plurality of storage battery cells, and operates by supplying power from the corresponding storage battery cell, A sensor module for measuring the state of the corresponding storage battery cell, and a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of the measurement result are transmitted to each of the sensor modules. It is a control method of an electrical storage system provided with the monitoring apparatus to perform. The sensor module has, as operation modes, a sleep mode in which some functions are restricted and an active mode in which restrictions on the some functions are released. The power storage system control method includes a first step in which the sensor module enters the active mode during a designated period, and a second step in which the sensor module enters the sleep mode during a period other than the designated period. It is characterized by including.

[15] In the power storage system control method, the sensor modules may be classified into a plurality of groups, and a common period in which the active mode is to be set may be designated for each of the classified groups.

[16] In the power storage system control method, the first step corresponds to a scheduled time when the sensor module receives a measurement request instructing measurement of the state of the storage battery cell from the monitoring device and the measurement request. A third step of operating in the active mode during a first active period including a processing time required for measurement, and a data request for instructing the sensor module to transmit measurement data including a measurement result of the measurement according to the measurement request And a fourth step of operating in the active mode during a second active period including a scheduled time for receiving the monitoring data from the monitoring device and a processing time required for transmitting the measurement data in response to the data request. Operates in the sleep mode during a period other than the first active period and the second active period. It may include a fifth step.

[17] In the control method of the power storage system, the first active periods of the sensor modules are set to be equal to each other, and the second active periods of the sensor modules are equal to each other. It may be set.

[18] In the power storage system control method, a sixth step in which the monitoring device outputs a synchronization signal, and a step in which the sensor module performs timing for switching the operation mode based on the synchronization signal. 7 steps may be included.

[19] In the control method of the power storage system, the measurement request includes the synchronization signal, and the sensor module has an operation mode including the active mode and the sleep mode as the operation mode, and the partial function. An initial activation mode in which the restriction is released, and the monitoring device transmits the measurement request to the respective sensor modules all at once, and the sensor module is activated in the initial activation mode. And when the sensor module receives a signal instructing execution of the measurement in the initial startup mode, starts measuring time for switching the operation mode, and sets the operation mode to the initial mode. A ninth step of switching from the start mode to the operation mode may be further included.

[20] In the control method of the power storage system, a tenth step in which the monitoring device calculates a correction time based on a charge state of the storage battery cell and transmits the correction time to the sensor module; and the sensor module includes the correction time. And an eleventh step of changing a preset period of the active mode.

[21] Another method according to a typical embodiment of the present invention includes a plurality of storage battery cells and a sensor module that is provided corresponding to each of the plurality of storage battery cells and measures a state of the corresponding storage battery cell. And a monitoring device that transmits a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of a measurement result to each of the sensor modules. It is. The power storage system control method includes a step in which the monitoring device transmits the measurement request to the sensor modules all at once.

2. Specific Examples of Embodiments Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to components common to the respective embodiments, and repeated description is omitted. It should be noted that the drawings are schematic, and the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual situation. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included.

<< Embodiment 1 >>
1 is a diagram illustrating a configuration of a power storage system according to Embodiment 1. FIG.
The power storage system 100 shown in the figure is a power storage system including, for example, a cycle-use lead storage battery. For example, the power storage system 100 supplies power to a load from a commercial power supply during normal operation, and supplies power to the load from a lead storage battery for power backup when a power failure occurs.

1, the power storage system 100 includes a host device (EMS: Energy Management System) 1 that performs overall control of the power storage system 100, and a power storage subsystem 101.

The power storage subsystem 101 includes a plurality of storage battery cells 5_1 to 5_n (n is an integer of 2 or more), a sensor module 3 as a parent device, sensor modules 4_1 to 4_n as child devices, and a monitoring device 2. Yes.

The storage battery cells 5_1 to 5_n are, for example, lead storage battery cells configured to be able to charge and discharge electric power. The storage battery cells 5_1 to 5_n are connected to each other in series to form an assembled battery, for example.

In addition, in this specification, when each storage battery cell 5_1 to 5_n is not distinguished, it may be simply described as “storage battery cell 5”.

The sensor modules 4_1 to 4_n are devices that operate as slave units. That is, the sensor modules 4_1 to 4_n are devices that are provided corresponding to the plurality of storage battery cells 5_1 to 5_n and measure the states of the corresponding storage battery cells 5_1 to 5_n. The sensor modules 4_1 to 4_n are electrically connected to the storage battery cells 5_1 to 5_n to be measured through power supply lines and measurement lines, and operate by being supplied with power from the storage battery cells 5_1 to 5_n to be measured.

The sensor modules 4_1 to 4_n have, as operation modes, a sleep mode in which some functions are restricted and an active mode in which the restrictions on some of the functions are released, and enters the active mode during a specified period. The sleep mode is entered during other periods.

Here, the part of the functions includes, for example, a communication function in which the sensor modules 4_1 to 4_n transmit / receive data to / from the monitoring device 2 (sensor module 3). The partial function may include a measurement function in which the sensor modules 4_1 to 4_n measure the state of the storage battery cells 5_1 to 5_n to be measured.

For example, the sensor modules 4_1 to 4_n operate in the power saving state with the communication function and the measurement function being stopped in the sleep mode, and in the active mode, the restriction of the communication function and the measurement function is released to the normal operation state, and the monitoring device 2 and the state of the storage battery cells 5_1 to 5_n are measured.

If the sensor modules 4_1 to 4_n are not distinguished from each other, they may be simply expressed as “storage battery cell 5”. Details of the sensor module 4 will be described later.

Sensor module 3 is a device that operates as a base unit. That is, the sensor module 3 is a device that relays communication between each of the sensor modules 4_1 to 4_n as slave units and the monitoring device 2. For example, the sensor module 3 performs wireless communication with each of the sensor modules 4_1 to 4_n and performs wired communication (for example, serial communication) with the monitoring device 2.

The monitoring device (BMU: Battery Management Unit) 2 is a device that monitors and diagnoses the state of each of the storage battery cells 5_1 to 5_n. The monitoring device 2 communicates with the sensor modules 4_1 to 4_n serving as slave units via the sensor module 3 serving as the master unit, whereby the state of each storage battery cell 5_1 to 5_n measured by the sensor modules 4_1 to 4_n is determined. Acquire measurement data including measurement results. The monitoring device 2 diagnoses the state of each of the storage battery cells 5_1 to 5_n based on the acquired measurement data, and transmits a diagnosis result or the like to the host device 1 as necessary.

Specifically, the monitoring device 2 instructs each sensor module 4_1 to 4_n to measure the state of the storage battery cells 5_1 to 5_n to be measured in order to monitor and diagnose the state of each of the storage battery cells 5_1 to 5_n. A measurement request to be transmitted and a data request for instructing transmission of measurement data including the measurement results of the states of the storage battery cells 5_1 to 5_n are transmitted via the sensor module 3.

The sensor module 4 measures the state of the storage battery cell 5 to be measured in response to a measurement request from the monitoring device 2 and measures the state of the storage battery cell 5 to be measured in response to a data request from the monitoring device 2. Measurement data including the result is transmitted to the monitoring device 2.

The monitoring device 2 transmits monitoring information and diagnostic information regarding the state of each of the storage battery cells 5_1 to 5_n to the host device (EMS) 1 by wired communication (by Ethernet or the like). Based on the monitoring information and the diagnostic information transmitted from the monitoring device 2, the host device 1 executes control including execution and stop of charging / discharging of the assembled battery including the storage battery cells 5_1 to 5_n.

Next, the sensor module 4 will be described in detail.
FIG. 2 is a diagram illustrating a configuration of the sensor module 4 in the power storage system 100 according to the first embodiment.

In this embodiment, the sensor modules 4_1 to 4_n have the same configuration, and the sensor module 3 also has the same configuration as the sensor modules 4_1 to 4_n.

The sensor module 4 includes a sensor unit 40, a communication device 41, and a data processing device 42. The sensor module 4 includes various peripheral circuits such as a power supply circuit in addition to the above-described functional units, but illustration thereof is omitted here.

The sensor unit 40 is a functional unit for measuring the state of the storage battery cell 5 to be monitored. The sensor unit 40 includes, for example, a voltage sensor 401 and a temperature sensor 402. The voltage sensor 401 is a device that measures the voltage (output voltage) of the storage battery cell 5. The temperature sensor 402 is a device that measures the temperature of the storage battery cell 5 (for example, the surface temperature of the storage battery cell 5).

The communication device 41 is a functional unit for communicating with the sensor module 3 as a parent device. The communication device 41 includes, for example, an antenna and a semiconductor integrated circuit device (wireless IC) for performing wireless communication with the sensor module 3 via the antenna.

As described later, the communication device 41 (wireless IC) is controlled to execute and stop by the control from the data processing device 42.

The data processing device 42 is a device that performs overall control of the sensor module 4 and executes various data processing. The data processing device 42 is, for example, a program processing device (semiconductor integrated circuit device) such as an MCU (Micro Control Unit).

Specifically, the data processing device 42 includes an arithmetic control unit 421 and a timer 423 as functional blocks. These functional units are realized by, for example, a CPU core included in the MCU as the data processing device 42 executing arithmetic processing according to a program stored in a storage device inside the MCU and controlling various peripheral circuits inside the MCU. Is done.

The timer 423 is a functional unit that measures time. Specifically, the timer 423 includes a counter 424, a storage unit 425, and a determination unit 426. The counter 424 is a functional unit that measures time by counting clock signals having a predetermined frequency.

The storage unit 425 stores time information serving as a reference for switching between operation modes (sleep mode and active mode). The storage unit 425 is, for example, a register (compare register).

In the storage unit 425, for example, information on the first determination reference time for switching the sensor module 4 from the sleep mode to the active mode (hereinafter referred to as “active mode start time”) as the determination reference time information serving as the determination reference for the operation mode switching. 4250 and information on the second determination reference time for switching the sensor module from the active mode to the sleep mode (hereinafter also referred to as “active mode end time information”) 4251 are stored.

The determination unit 426 compares the measurement time based on the count value of the counter 424 with the determination reference time based on the active mode start time information 4250 and the active mode end time information 4251 stored in the storage unit 425 to determine the measurement time. When the time coincides with the reference time, a determination signal Vd indicating the determination result is output.

For example, when the measurement time (count value) of the counter 424 matches the determination reference time based on the active mode start time information 4250, the determination unit 426 changes the determination signal Vd from the first logic level (eg, low level) to the second logic level. Switch to a level (eg high level).

On the other hand, when the measurement time (count value) of the counter 424 matches the active mode end time information 4251, the determination unit 426 changes the determination signal Vd from the second logic level (for example, high level) to the first logic level (for example, low level). ).

The arithmetic control unit 421 is a functional unit that switches the operation mode based on the measurement time by the timer 423 and controls the communication device 41 and the sensor unit 40 to realize the main function as the sensor module 4.

When the measurement time of the timer 423 coincides with the first determination reference time based on the active mode start time information 4250 in the sleep mode, the arithmetic control unit 421 switches the operation mode of the sensor module 4 from the sleep mode to the active mode, In the mode, when the measurement time of the timer 423 coincides with the second determination reference time based on the active mode end time information 4251, the operation mode of the sensor module 4 is switched from the active mode to the sleep mode.

For example, the arithmetic control unit 421 includes an operation mode register 4220 that stores a value indicating an operation mode. The arithmetic control unit 421 updates the set value of the operation mode register 4220 according to the switching of the logic level of the determination signal Vd output from the determination unit 426 of the timer 423, and according to the set value of the operation mode register 4220. Control of the communication apparatus 41, the sensor part 40, etc. is performed.

In the above example, the arithmetic control unit 421 sets a value indicating the active mode in the operation mode register 4220 when the determination signal Vd is switched from the first logic level (low level) to the second logic level (high level). When the determination signal Vd is switched from the second logic level (high level) to the first logic level (low level), a value indicating the sleep mode is set in the operation mode register 4220.

In the sleep mode, the arithmetic control unit 421 stops a part of the data processing device 42 and stops the communication device 41, and in the active mode, restores the function of the stopped data processing device 42 and causes the communication device 41 to to start.

More specifically, the arithmetic control unit 421 stops the communication function of the communication device 41 when the set value of the operation mode register 4220 is switched from the active mode to the sleep mode. For example, the arithmetic control unit 421 controls an external device (the sensor module 3 and the monitoring device 2) of the communication device 41 by controlling a power supply circuit (not shown) and stopping the power supply to the communication device 41 (wireless IC). Stop the communication function. Alternatively, when the wireless IC that is a component of the communication device 41 has the normal operation mode and the power saving mode, the arithmetic control unit 421 shifts the wireless IC from the normal operation mode to the power saving mode. And the function of communicating with the external devices (the sensor module 3 and the monitoring device 2) of the communication device 41 is stopped. At this time, the arithmetic control unit 421 may stop not only the communication device 41 but also the sensor unit 40.

In addition, when the set value of the operation mode register 4220 is switched from the active mode to the sleep mode, the arithmetic control unit 421 stops some functions of the data processing device 42 and shifts to the power saving state. For example, when the MCU as the data processing device 42 has the normal operation mode and the power saving mode, the arithmetic control unit 421 shifts the data processing device 42 from the normal operation mode to the power saving mode. At this time, for example, the timer 423 performs a normal operation, and the arithmetic control unit 421 stops a part of the operation.

On the other hand, when the setting value of the operation mode register 4220 is switched from the sleep mode to the active mode, the arithmetic control unit 421 shifts the data processing device 42 from the power saving mode to the normal operation mode and stops the data processing device. 42 function is restored.

In addition, the arithmetic control unit 421 restores other functional units (for example, the communication device 41 and the sensor unit 40) of the sensor module 4 that have been stopped in the sleep mode. For example, the arithmetic control unit 421 controls the power supply circuit (not shown) and restarts the power supply to the communication device 41 (wireless IC), whereby the external device (the sensor module 3 and the monitoring device 2) of the communication device 41 is connected. Restore the communication function. Alternatively, when the wireless IC configuring the communication device 41 has shifted to the power saving mode, the arithmetic control unit 421 instructs the wireless IC to shift from the power saving mode to the normal operation mode, and the communication device The function of communicating with 41 external devices (the sensor module 3 and the monitoring device 2) is restored.

When the sensor unit 40 is also stopped in the sleep mode, the sensor unit 40 is returned in the active mode in the same manner as the communication device 41.

Next, the timing of communication between the monitoring device 2 and each of the sensor modules 4_1 to 4_n in the power storage system 100 according to Embodiment 1 will be described.

FIG. 3 is a timing chart showing the timing of communication between the monitoring device 2 and each of the sensor modules 4_1 to 4_n in the power storage system 100 according to the first embodiment. In the figure, it is assumed that the sensor modules 4_1 to 4_n are always in the active mode.

In the power storage system 100, the monitoring device 2 acquires measurement data of the states of the storage battery cells 5_1 to 5_n, for example, periodically in order to monitor and diagnose the state of the storage battery cells 5_1 to 5_n.

Specifically, the monitoring device 2 transmits measurement requests to the plurality of sensor modules 4 all at once. For example, as shown in FIG. 3, the monitoring device 2 transmits a measurement request to each of the sensor modules 4_1 to 4_n by broadcasting. Each of the sensor modules 4_1 to 4_n that has received the measurement request executes a measurement process for measuring the state (voltage and temperature) of the storage battery cells 5_1 to 5_n to be measured.

Thus, the state of each of the storage battery cells 5_1 to 5_n can be measured simultaneously, so that the SOC of the assembled battery composed of the storage battery cells 5_1 to 5_n can be calculated with high accuracy. Further, according to this, it is not necessary to change the configuration of each of the sensor modules 4_1 to 4_n in order to synchronize the measurement start timing among the sensor modules 4_1 to 4_n.

Next, the monitoring device 2 requests the sensor modules 4_1 to 4_n to transmit measurement data after the measurement processing according to the measurement requests by the sensor modules 4_1 to 4_n is completed. For example, as shown in FIG. 3, the monitoring device 2 sequentially transmits data requests to the sensor modules 4_1 to 4_n by unicast.

Each of the sensor modules 4_1 to 4_n that has received the data request passes measurement data including the measurement results of the state (voltage and temperature) of the storage battery cells 5_1 to 5_n measured according to the previous measurement request via the sensor module 3. To the monitoring device 2 (data response). For example, as shown in FIG. 3, each of the sensor modules 4_1 to 4_n sequentially transmits measurement data to the monitoring device 2 from the sensor modules 4_1 to 4_n that have received the data request.

The period from when the monitoring device 2 transmits a measurement request until the monitoring device 2 receives measurement data from each of the sensor modules 4_1 to 4_n is one assembled battery measurement period.

Next, the switching timing of the operation mode of each of the sensor modules 4_1 to 4_n in the power storage system 100 will be described.

FIG. 4 is a diagram showing an outline of switching of operation modes of the sensor module 4 according to the first embodiment. In the figure, the switching timing of the operation mode of one sensor module 4 is representatively shown.

As described above, in the power storage system 100, the sensor module 4 operates in the active mode during a specific period, and operates in the sleep mode during other periods.
Specifically, as shown in FIG. 4, the sensor module 4 includes a scheduled time tk1 for receiving a measurement request from the monitoring device 2 and a processing time Tk1 necessary for executing a measurement according to the measurement request. It operates in the active mode during a period (hereinafter also referred to as “first active period Ta1”).

Further, as shown in FIG. 4, the sensor module 4 includes a scheduled time tk2 for receiving a data request from the monitoring device 2 and a processing time Tk2 necessary for transmitting measurement data in response to the data request ( Hereinafter, it is also referred to as “second active period Ta2”. On the other hand, in the periods other than the first active period Ta1 and the second active period Ta2, the sensor modules 4_1 to 4_n operate in the sleep mode.

As shown in FIG. 4, in order to operate the sensor module 4, the storage unit 425 of the timer 423 stores the start time ts1 of the first active period Ta1 and the start time ts2 of the second active period Ta2, and the active mode start time information. 4250 and the end time te1 of the first active period Ta1 and the end time te2 of the second active period Ta2 are stored as active mode end time information 4251.

Note that the start times ts1, ts2 and end times te1, te2 are when the time when the measurement request or the data request is scheduled to be received is shifted, when the processing time related to measurement or data transmission varies, or when data transmission / reception fails It is preferable to set in consideration of the time required for retransmission.

FIG. 5 is a timing chart showing switching timings of the operation modes of the sensor modules 4_1 to 4_n in the power storage system according to the first embodiment.

As described above, appropriate active mode start time information 4250 and active mode end time information 4251 are set in the timer 423 for each of the sensor modules 4_1 to 4_n.

For example, the values of the common start time ts1 and end time te1 of the first active period Ta1 are set in the active mode start time information 4250 and the active mode end time information 4251 of the timers 423 of the sensor modules 4_1 to 4_n, respectively. The

Further, considering the scheduled time tk2 for receiving the data request for each of the sensor modules 4_1 to 4_n and the processing time Tk2 related to the data response, the values of the appropriate start time ts2 and end time te2 of the second active period Ta2 are The mode start time information 4250 and the active mode end time information 4251 are set in the storage unit 425 of the timer 423 of the sensor modules 4_1 to 4_n, respectively.

For example, as shown in FIG. 5, the values of the start time ts2_1 and the end time te2_1 of the second active period Ta2_1 are set in the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of the sensor module 4_1. The

Also, values of the start time ts2_2 and the end time te2_2 of the second active period Ta2_2 are set in the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of the sensor module 4_2.

Furthermore, in the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of the sensor module 4_n, values of the start time ts2_n and the end time te2_n of the second active period Ta2_n are set.

According to this, as shown in FIG. 5, each of the sensor modules 4_1 to 4_n can operate by switching between the active mode and the sleep mode at an appropriate timing.

Here, the active mode start time information 4250 and the active mode end time information 4251 of each of the sensor modules 4_1 to 4_n are preferably set so that the periods of operation of the sensor modules 4_1 to 4_n in the active mode are equal. That is, the first active periods Ta1 of the sensor modules 4_1 to 4_n are equal to each other, and the second active periods Ta2_1 to Ta2_n of the sensor modules 4_1 to 4_n are equal to each other.

According to this, it becomes possible to control the power consumption of each sensor module 4_1 to 4_n to be equal in one assembled battery measurement period.

As described above, the power storage system according to Embodiment 1 is provided for each of the plurality of storage battery cells 5_1 to 5_n, operates with power supplied from the corresponding storage battery cells 5_1 to 5_n, and corresponds to the storage battery cells 5_1 to 5_n. Each of the plurality of sensor modules 4_1 to 4_n that measure the state of each has a sleep mode in which some functions are restricted and an active mode in which some functions are released and is active during a specified period Mode, and sleep mode is entered during other periods.

According to this, since the power consumption of each sensor module can be reduced in the power storage system provided with the sensor module, the influence on the SOC of each storage battery cell due to the power supply from each storage battery cell to each sensor module is reduced. Can do. Thereby, it becomes possible to suppress the characteristic between storage battery cells, ie, variation in SOC.

Specifically, the sensor modules 4_1 to 4_n each include a first active period including a scheduled time for receiving a measurement request from the monitoring device 2 and a processing time required for measurement according to the measurement request, and data from the monitoring device 2. It operates in the active mode in the second active period including the scheduled time for receiving the request and the processing time required to transmit the measurement data in response to the data request, and the sleep mode in the period other than the first active period and the second active mode Works with.

According to this, it is possible to suppress power consumption of the sensor modules 4_1 to 4_n while appropriately performing processing according to a request from the monitoring device 2, and to suppress variation in SOC between storage battery cells.

Also, the first active periods of the sensor modules 4_1 to 4_n are set to be equal to each other, and the second active periods of the sensor modules 4_1 to 4_n are set to be equal to each other.

According to this, since it is possible to control the power consumption of each sensor module 4_1 to 4_n to be equal in one assembled battery measurement period, variation in power consumption among the sensor modules 4_1 to 4_n. Can be suppressed. Thereby, it is possible to further suppress the variation in SOC between the storage battery cells 5_1 to 5_n.

<< Embodiment 2 >>
FIG. 6 is a diagram illustrating a configuration of the power storage system according to the second embodiment.
The power storage system 100A according to the second embodiment is different from the first embodiment in that a plurality of sensor modules are divided into a predetermined number of groups and a common first active period and second active period are set for each group. It differs from the electrical storage system 100 which concerns, and is the same as that of the electrical storage system 100 which concerns on Embodiment 1 in another point.

In the power storage system 100A according to Embodiment 2, the sensor modules 4 are classified into a plurality of groups, and a common period in which the active mode is to be set is designated for each classified group.

Specifically, the plurality of storage battery cells 5_1 to 5_n in the power storage system 100A are connected to each other in series to form an assembled battery, and the plurality of storage battery cells 5_1 to 5_n and a plurality of sensor modules 4_1 to 4_n provided correspondingly. Are divided into j (n is an integer of 2 or more) groups 6_1 to 6_j. The groups 6_1 to 6_j include, for example, k (k is an integer of 1 or more) sensor modules 4_1 to 4_k, respectively. Note that if the groups 6_1 to 6_j are not distinguished from each other, they may be simply referred to as “group 6”.

FIG. 7 is a timing chart showing operation mode switching timings of the sensor modules 4_1 to 4_k for the groups 6_1 to 6_j in the power storage system according to the second embodiment.

As shown in FIG. 7, the sensor modules 4_1 to 4_k belonging to the same group 6 switch from the active mode to the sleep mode and also switch from the sleep mode to the active mode at a predetermined time with the monitoring device 2. .

The sensor modules 4_1 to 4_k constituting the assembled battery in the power storage system 100A receive the measurement request from the monitoring device 2 at the same time regardless of the group 6. Therefore, the start time ts1 and the end time te1 of the first active period Ta1 of the sensor modules 4_1 to 4_k are set to be the same time regardless of the group 6.

That is, in the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of each sensor module 4_1 to 4_k, “time ts1” is set as the start time of the first active period Ta1, and the first active period Ta1 "Te1" is set as the end time of.

On the other hand, in the power storage system 100A, data requests are sequentially transmitted from the monitoring device 2 for each group 6. Therefore, the start time and end time of the second active period Ta2 of the sensor modules 4_1 to 4_k are set to be different times for the groups 6_1 to 6_j.

For example, as shown in FIG. 7, the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of the sensor modules 4_1 to 4_k of the group 6_1 include “time ts2_1” as the start time of the second active period Ta2_1. Is set, and “time te2_1” is set as the end time of the second active period Ta2_1.

In addition, in the active mode start time information 4250 and the active mode end time information 4251 of the timer 423 of the sensor modules 4_1 to 4_k of the group 6_2, “time ts2_2” is set as information on the start time of the second active period Ta2_2. “Time te2_2” is set as information on the end time of the two active periods Ta2_2.

Similarly, in the active mode start time information 4250 and active mode end time information 4251 of the timer 423 of the sensor modules 4_1 to 4_k of the group 6_j, “time ts2_n” is set as the start time information of the second active period Ta2_j, “Time te2_n” is set as information on the end time of the second active period Ta2_j.

According to this, the sensor modules 4_1 to 4_k belonging to the same group 6 operate in the active mode at the same time and operate to shift to the sleep mode at the same time.

Here, in the first active period Ta1, all the sensor modules 4_1 to 4_k belonging to the same group 6 receive the data request transmitted from the monitoring device 2 and transmit the data response to the data request. It is necessary to determine so that it can be executed reliably.

For example, when k sensor modules 4_1 to 4_k belong to one group 6, the length of the second active period Ta2 of one group 6 is “(all sensor modules 4_1 to 4 belonging to the same group 6”. The sum of the processing times required for the data response of 4_k) + (the spare time Te for data retransmission determined by the system) ”is sufficient.

The spare time Te for data retransmission determined by the system is set when transmission / reception of a packet related to a data request and a packet related to a data response (packet communication between the monitoring device 2 and each sensor module 4) fails. This is the time required to retransmit the received packet.

In the power storage system 100A, the communication between the monitoring device 2 and each sensor module 4 is performed by relaying the sensor module 3 as a parent device, and the sensor module 3 and each sensor module 4 perform wireless communication. For this reason, communication between the sensor module 3 and the sensor module 4 may fail due to some influence.

Therefore, in the power storage system 100A, when the communication between the sensor module 3 and the sensor module 4 fails, the measurement processing and data collection processing are performed using the data retransmission function of the wireless IC mounted on the

sensor modules

3 and 4. Etc., retransmission processing of various types of packets is performed. Of these, it is necessary to design the system so that the packet retransmission related to the data collection processing falls within the spare time for data retransmission determined by the system determined by the system in each group 6.

FIG. 8A is a timing chart when the packet resending process is not performed in each sensor module 4 in the power storage system 100A according to the second embodiment. FIG. 8B is a timing chart when a packet retransmission process is performed in each sensor module 4 in power storage system 100A according to Embodiment 2.

8A and 8B show timing charts at the time of data response by the sensor modules 4_1 to 4_k in one group 6. FIG. 8A and 8B, as described above, the total processing time required for data responses of all the sensor modules 4_1 to 4_k belonging to the same group 6 and the spare time Te for data retransmission determined by the system are considered. Assume that the second active time Ta2 is set.

As shown in FIG. 8A, when the data response is successfully completed without performing the packet retransmission process in each of the sensor modules 4_1 to 4_k, after the processes related to the data responses of all the sensor modules 4_1 to 4_k are completed, After the elapse of time Te, the sensor modules 4_1 to 4_k shift from the active mode to the sleep mode.

On the other hand, as shown in FIG. 8B, for example, when the transmission of a packet related to the data response by the sensor module 4_1 fails, the sensor module 4_1 performs a retransmission process of the packet. In this case, the timing (time) at which the data request is transmitted from the monitoring device 2 to the next sensor module 4_2 is shifted. As a result, the timings of receiving data requests and transmitting packets of the sensor modules 4_3 to 4_k after the sensor module 4_2 are shifted. In addition, when the packet retransmission process is performed in the sensor modules 4_2 to 4_k, the timing of each process of the sensor modules 4_2 to 4_k is further shifted.

Therefore, as shown in FIGS. 8A and 8B, the second active period Ta2 is set by setting the spare time Te in consideration of the case where the packet processing related to the data response is performed in each of the sensor modules 4_1 to 4_k. , Reception of data requests and retransmission of packets in all sensor modules 4_1 to 4_k can be completed.

Here, it is preferable to set the second active periods Ta2_1 to Ta2_j of the groups 6_1 to 6_j to be equal to each other. For this purpose, the number of sensor modules 4 belonging to each of the groups 6_1 to 6_j is preferably the same.

If the number of sensor modules 4 belonging to each group 6_1 to 6_j is not the same, for example, the number of sensor modules 4 belonging to the jth group 6_j is set to the number of sensors belonging to the other groups 6_1 to 6_j-1. The number may be less than the number of modules 4.

As described above, in the power storage system 100A according to Embodiment 2, the sensor module 4 is classified into a plurality of groups 6_1 to 6_j, and a common period in which the active mode is to be set is designated for each of the classified groups 6_1 to 6_j. .

According to this, since it is not necessary to individually set the start time and end time of the active period for each of the sensor modules 4_1 to 4_k as the slave units, for example, large-scale power storage with several hundred storage battery cells Even when the sensor modules 4_1 to 4_k are installed in the system, it is possible to simplify time setting work and management work related to switching of operation modes of the sensor modules 4_1 to 4_k.

<< Embodiment 3 >>
FIG. 9 is a diagram illustrating a configuration of a sensor module in the power storage system according to Embodiment 3.
The power storage system 100B according to the third embodiment is different from the power storage system 100 according to the first embodiment in that the sensor module performs time measurement for switching the operation mode based on the synchronization signal. This is the same as the power storage system 100 according to the first embodiment.

In the power storage system 100B, the monitoring device 2B transmits a synchronization signal Vs to each of the sensor modules 4B_1 to 4B_n as slave units via the sensor module 3 as a master unit.

Here, the synchronization signal Vs indicates the time axis for switching the operation mode in each of the sensor modules 4B_1 to 4B_n, and the timing (time) of packet transmission such as a measurement request or a data request to each of the sensor modules 4B_1 to 4B_n in the monitoring device 2B. ) Is a signal for synchronizing with the time axis serving as a reference.

Each of the sensor modules 4B_1 to 4B_n performs time measurement for switching the operation mode based on the synchronization signal Vs transmitted from the monitoring device 2B.

Specifically, the monitoring device 2B includes the packet of the synchronization signal Vs in the measurement request that is simultaneously transmitted to each of the sensor modules 4B_1 to 4B_n. Each sensor module 4B_1 to 4B_n synchronizes the time of its own timer 423B with reference to the reception timing of the measurement request including the synchronization signal Vs. More specifically, each of the sensor modules 4B_1 to 4B_n sets the count value of the counter 424B of the timer 423B to a predetermined value when receiving the measurement request packet. For example, the count value of the counter 424B is reset.

According to this, every time a measurement request is transmitted from the monitoring device 2B, the time axis related to the switching of the operation mode of each of the sensor modules 4B_1 to 4B_n can be synchronized with the time axis related to the packet transmission of the monitoring device 2B. Therefore, the sensor modules 4B_1 to 4B_n can perform operation mode switching and packet transmission / reception at appropriate timing.

In the sensor modules 4B_1 to 4B_n, in addition to the active mode and the sleep mode, in addition to the active mode and the sleep mode, another operation mode is provided in order to more surely perform the switching of the operation mode and the appropriate processing according to the request from the monitoring device 2B. It is preferable to provide it. Details will be described below.

For example, as shown in FIG. 10, the sensor modules 4B_1 to 4B_n preferably have an operation mode including the above-described active mode and sleep mode, and an initial startup mode as operation modes.

Here, the initial activation mode is an operation mode in which restrictions on some functions of the sensor module 4B are removed. Specifically, the initial activation mode is an operation mode in which at least the restriction of the communication function of the sensor module 4B is released and communication with the monitoring device 2B is possible. For example, the initial operation mode may be the same mode as the active mode described above. In the present embodiment, as an example, it is assumed that the initial operation mode is the same mode as the active mode.

The sensor modules 4B_1 to 4B_n are first activated in the initial activation mode, and when receiving a signal instructing execution of measurement in the initial activation mode, that is, a measurement request, the operation mode is switched from the initial activation mode to the operation mode. Then, timing for switching the operation mode (active mode and sleep mode) in the operation mode is started.

FIG. 11 is a timing chart showing switching timings of the operation modes of the sensor modules 4B_1 to 4B_n in the power storage system 100B according to the third embodiment.

First, as shown in FIG. 11, it is assumed that the sensor modules 4B_1 to 4B_n are activated at different timings. After activation (for example, after canceling the power-on reset), the data processing device 42B of each of the sensor modules 4B_1 to 4B_n first sets a value designating “initial activation mode” in the operation mode register 4220. As a result, the sensor modules 4B_1 to 4B_n are in a state in which the restriction of the functions of the sensor modules 4B_1 to 4B_n is released, that is, the state in which the communication with the monitoring device 2B and the measurement of the storage battery cell 5 are possible, as in the active mode. It becomes.

Next, it is assumed that the monitoring device 2B transmits measurement requests to the sensor modules 4B_1 to 4B_n all at once, and the sensor modules 4B_1 to 4B_n receive the measurement requests at time t1. At this time, in the data processing device 42B of each of the sensor modules 4B_1 to 4B_n, the arithmetic control unit 421 resets the value of the counter 424B of the timer 423B based on the synchronization signal Vs included in the received measurement request packet and operates. The setting value of the mode register 4220 is switched to “operation mode (active mode)”. Thereby, the sensor modules 4B_1 to 4B_n and the monitoring device 2B are synchronized, and the sensor modules 4B_1 to 4B_n operate in the active mode.

Thereafter, similarly to the sensor module 4 according to the first embodiment, in the timer 423B, the counter 424B starts counting (clocking), and the determination unit 426 sets the count value of the counter 424B and the active mode set in the storage unit 425. Based on the start time information 4250 and the active mode end time information 4251, the logic level of the determination signal Vd is switched. The arithmetic control unit 421 switches the set value of the operation mode register 4220 between the active mode and the sleep mode based on the determination signal Vd.

As described above, according to the power storage system 100B according to the third embodiment, the sensor module 4B performs time measurement for switching the operation mode based on the synchronization signal Vs output from the monitoring device 2B, and thus each sensor module 4B_1 to 4B_n. The time axis relating to the switching of the operation mode in can be synchronized with the time axis serving as a reference for the timing (time) of packet transmission such as measurement requests and data requests to the sensor modules 4B_1 to 4B_n in the monitoring device 2B. This makes it possible to reduce the power consumption of the sensor module 4B while reliably responding to measurement requests and data requests from the monitoring device 2B.

Generally, when a sensor module is connected to a storage battery cell at the time of enforcement or maintenance of the power storage system, the sensor module is quickly turned on and starts operating. Therefore, at the time of construction of the power storage system, etc., there is a possibility that the sensor modules are started at different timings and the sensor modules are not synchronized with each other.

On the other hand, in the power storage system 100B, the sensor module 4B has, as operation modes, an operation mode including an active mode and a sleep mode, and an initial activation mode in which some functions are released. When the measurement request transmitted simultaneously from the monitoring device 2B to the sensor modules 4B is received, the timing for switching the operation mode is started and the operation mode is switched from the initial activation mode to the operation mode.

According to this, even when the sensor modules 4B are activated at different timings during construction of the power storage system 100A, etc., each sensor module 4B receives a measurement request transmitted from the monitoring device 2B. The synchronization between the sensor modules 4B and the synchronization between the sensor modules 4B and the monitoring device 2B can be achieved. Thereby, it becomes possible for each sensor module 4B to reduce the power consumption of the sensor module 4B while responding more reliably to the measurement request and data request from the monitoring device 2B.

<< Embodiment 4 >>
FIG. 12 is a diagram illustrating a configuration of a sensor module in the power storage system according to the fourth embodiment.

The power storage system 100C according to the fourth embodiment is different from the power storage system 100 according to the first embodiment in that the period during which the sensor module operates in the active mode can be adjusted. 1 is the same as the power storage system 100 according to 1.

In general, each sensor module attached to a storage battery cell has characteristics of the storage battery cell itself even when the power consumption is suppressed by providing a period for operating the sleep mode as in Embodiments 1 to 3 described above. Due to individual differences or the like, there is a possibility that the SOC varies between the storage battery cells during system operation.

Therefore, in the power storage system 100C according to the fourth embodiment, the period in which the sensor modules 4C_1 to 4C_n operate in the active mode is finely adjusted based on the SOC of each storage battery cell 5.
Specifically, in power storage system 100 C, monitoring device 2 C calculates correction time Tc during which sensor module 4 C is in the active mode based on the state of charge for each storage battery cell 5, and transmits it to sensor module 4 C. The data processing device 42C of the sensor module 4C changes the period during which the active mode is set based on the received correction time Tc.

FIG. 13 is a diagram for explaining a method of adjusting a period during which the sensor module 4C is in the active mode. In the figure, as an example, the second active period Ta2 of one sensor module 4C is shown as an example.

For example, it is assumed that information on the start time ts2 of the second active period Ta2 and information on the end time te2 of the second active period Ta2 are stored in advance in the storage unit 425 of the timer 423C of the sensor module 4C.

As shown in (a) of FIG. 13, the sensor module 4 C has the second active period Ta 2 based on the information stored in the storage unit 425 as standard control, similarly to the sensor module 4 according to the first embodiment. To decide.

Here, let us consider a case where a deviation (difference) occurs between the SOC of the storage battery cell 5 corresponding to the sensor module 4C and the SOC of the other storage battery cell 5. In this case, the SOC shift of the storage battery cell 5 is caused by variations in characteristics of the storage battery cell 5 itself, a shift in power consumption between the sensor module 4C connected to the storage battery cell 5 and the other sensor modules 4C, or the like. Possible cause.

Therefore, the monitoring device 2C calculates the correction time Tc of the second active period Ta2 of the sensor module 4C based on the amount of deviation between the SOC of the sensor module 4C and the SOC of the other storage battery cell 5. The monitoring device 2C transmits the calculated correction time Tc to the sensor module 4C to be corrected. For example, the sensor module 4C stores the received correction time Tc as the correction time information 4252 in the storage unit 425 of the timer 423, and changes the end time of the period in which the active mode is set based on the correction time Tc.

For example, when the SOC of the sensor module 4C is higher than the SOC of the other sensor module 4C, the monitoring device 2C corrects the power consumption of the storage battery cell 5 by increasing the second active period Ta2 of the sensor module 4C. Tc is calculated and transmitted to the sensor module 4C.

Based on the received correction time Tc, the sensor module 4C, for example, sets the time (te2 + Tc) obtained by adding the correction time Tc to the preset end time te2 of the second active period Ta2, and the end time of the second active period Ta2. And That is, the determination unit 426 of the timer 423C switches the logic level of the determination signal Vd when the count value of the counter 424 reaches (te2 + Tc). Thereby, as shown in FIG. 13B, the second active period Ta2 of the sensor module 4C is longer than the initial period by the correction time Tc.

On the other hand, when the SOC of the sensor module 4C is lower than the SOCs of the other sensor modules 4C, the monitoring device 2C corrects the power consumption of the storage battery cell 5 by shortening the second active period Ta2 of the sensor module 4C. Tc is calculated and transmitted to the sensor module 4C.

Based on the received correction time Tc, the sensor module 4C, for example, sets a time (te2-Tc) obtained by subtracting the correction time Tc from the preset end time te2 of the second active period Ta2 as a new second active period. The end time of Ta2. That is, the determination unit 426 of the timer 423C switches the logic level of the determination signal Vd when the count value of the counter 424 reaches (te2-Tc). As a result, as shown in FIG. 13B, the second active period Ta2 of the sensor module 4C is shorter than the initial period by the correction time Tc.

Thereafter, when the deviation between the SOC of the sensor module 4C and the SOC of the other sensor module 4C is resolved, the sensor module 4C returns to the standard control (see FIG. 13A). For example, the monitoring device 2C transmits data of “correction time Tc = 0” to the sensor module 4C.

As described above, according to the power storage system 100C according to the fourth embodiment, the monitoring device 2C corrects the period in which the sensor module 4 that measures the state of the storage battery cell 5 is in the active mode based on the charge state of the storage battery cell 5. The time Tc is calculated and transmitted to the sensor module 4, and the sensor module 4 changes the period during which the active mode is set based on the received correction time Tc.

According to this, even if there is a deviation between the SOC of the specific storage battery cell 5 and the SOC of the other storage battery cell 5 due to the difference in individual characteristics of the storage battery cell 5 itself, The active period of the sensor module 4C receiving power supply from the storage battery cell 5 can be made different from the active periods of the other sensor modules 4C. Thereby, since it can adjust so that the power consumption between the storage battery cells 5 may become equal, it becomes possible to further reduce the shift | offset | difference of SOC between the storage battery cells 5. FIG.

<< Extended embodiment >>
Although the invention made by the present inventors has been specifically described based on the embodiments, it is needless to say that the present invention is not limited thereto and can be variously modified without departing from the gist thereof. Yes.

For example, in the fourth embodiment, the case where the second active period Ta2 is adjusted is illustrated as an example of the method for adjusting the period in which the sensor module 4C operates in the active mode. Can be adjusted.

Moreover, in the said Embodiment 4, although the case where the monitoring apparatus 2C calculated correction | amendment time Tc based on the charge condition of the storage battery cell 5 was illustrated, it is not restricted to this. For example, the data processing device 42 of each sensor module 4 may calculate the correction time Tc. In this case, the monitoring device 2 C transmits information on the SOC of each storage battery cell 5 to each sensor module 4. For example, the monitoring device 2C may include the SOC information of each storage battery cell 5 in the data request packet, or each packet including the SOC information of each storage battery cell 5 at a timing different from the data request. It may be transmitted to the sensor module 4.

In the above embodiment, the case where the sensor module 3 of the parent device relays communication between the sensor module 4 of the child device and the monitoring device 2 is illustrated, but the present invention is not limited to this. You may perform radio | wireless communication directly between the sensor module 4 of a subunit | mobile_unit, and the monitoring apparatus 2. FIG.

Moreover, in the said

Embodiment

3, 4, the function which synchronizes each sensor module 4 and the monitoring apparatus 2, and the function which adjusts the period which becomes active mode of each sensor module 4 are the electrical storage system 100 which concerns on Embodiment 1. FIG. However, the present invention is not limited to this, and the functions described above may also be applied to the other second to fourth embodiments described above.

Further, the control technology of the sensor module 4 according to the present invention can be similarly applied to a storage battery system in which a plurality of storage battery strings (strings) including storage battery cells 5_1 to 5_n are connected in parallel. In this case, for example, the control technology of the sensor module 4 according to the present invention may be applied for each string. For example, the sensor modules 4_1 to 4_n may be divided into a plurality of groups 6_1 to 6_j in one string, and the sensor modules 4 may be controlled for each group as in the second embodiment.

DESCRIPTION OF SYMBOLS 1 ... High-order apparatus (EMS), 2, 2B, 2C ... Monitoring apparatus, 3 ... Sensor module (parent machine), 4, 4B, 4C, 4_1-4_n, 4_k, 4B_1-4B_n, 4C_1-4C_n ... Sensor module, 5 , 5_1 to 5_n, 5_k ... storage cell, 6, 6_1 to 6_j ... group, 40 ... sensor unit, 41 ... communication device, 42, 42B, 42C ... data processing device, 100 ... power storage system, 100A ... power storage system, 100B ... Power storage system, 100C ... Power storage system, 101 ... Power storage subsystem, 401 ... Voltage sensor, 402 ... Temperature sensor, 421 ... Operation control unit, 423, 423B, 423C ... Timer, 424 ... Counter, 425 ... Storage unit, 426 ... Determination , 4220 ... operation mode register, 4250 ... active mode start time information, 4251 ... Active mode end time information, 4252 ... correction time information, Vs ... synchronization signal.

Claims

A plurality of storage battery cells;
A sensor module that is provided corresponding to each of the plurality of storage battery cells, operates by supplying power from the corresponding storage battery cell, and measures the state of the corresponding storage battery cell;
A monitoring device that transmits a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of a measurement result to each of the sensor modules;
The sensor module has, as operation modes, a sleep mode in which some functions are limited and an active mode in which the restrictions on some functions are released, and the active mode is set in a specified period. The power storage system is characterized in that the sleep mode is entered during the period.
The power storage system according to claim 1,
The sensor module is classified into a plurality of groups, and a common period to be in the active mode is designated for each of the classified groups.
The power storage system according to claim 1 or 2,
The sensor module is in the active mode in a first active period including a scheduled time for receiving a measurement request instructing measurement of the state of the storage battery cell from the monitoring device and a processing time required for measurement according to the measurement request. A scheduled time for receiving a data request for instructing transmission of measurement data including a measurement result of measurement corresponding to the measurement request and a processing time required for transmission of the measurement data corresponding to the data request The power storage system is characterized in that it operates in the active mode during a second active period including: and operates in the sleep mode during a period other than the first active period and the second active period.
The power storage system according to claim 3,
The first active periods of the sensor modules are set to be equal to each other, and the second active periods of the sensor modules are set to be equal to each other. .
The power storage system according to claim 3 or 4,
The monitoring device outputs a synchronization signal;
The power storage system, wherein the sensor module performs time measurement for switching the operation mode based on the synchronization signal.
The power storage system according to claim 5,
The measurement request includes the synchronization signal;
The monitoring device transmits the measurement request to the sensor modules all at once,
The sensor module has, as the operation mode, an operation mode including the active mode and the sleep mode, and an initial activation mode in which the restriction on some of the functions is released,
When the sensor module starts in the initial startup mode and receives a signal instructing execution of the measurement in the initial startup mode, the sensor module starts timing for switching the operation mode, and sets the operation mode. Switching from the initial startup mode to the operation mode.
The power storage system according to any one of claims 3 to 6,
The monitoring device calculates a correction time based on the state of charge of the storage battery cell, and transmits the correction time to the sensor module,
The power storage system, wherein the sensor module changes a preset period of the active mode based on the correction time.
A plurality of storage battery cells;
A sensor module that is provided corresponding to each of the plurality of storage battery cells and measures the state of the corresponding storage battery cell;
A monitoring device that transmits a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of a measurement result to each of the sensor modules;
The power storage system, wherein the monitoring device transmits the measurement request to the sensor modules all at once.
A sensor module for measuring the state of a storage battery cell,
The sensor module has, as operation modes, a sleep mode in which a part of functions is restricted and an active mode in which the restriction of the part of functions is released, and enters the active mode during a specified period, The sensor module is in the sleep mode during a period other than the above.
The sensor module according to claim 9, wherein
A sensor unit for detecting a state of the storage battery cell;
A communication device for communicating with an external device;
A data processing device for performing data processing,
The data processing device includes:
A timer for timing,
An operation control unit for switching the operation mode based on the measurement time by the timer and controlling the communication device and the sensor unit,
The arithmetic control unit stops the communication device and part of the function of the data processing device in the sleep mode, and the measurement time of the timer coincides with the first determination reference time during the sleep mode. In this case, the operation mode is switched from the sleep mode to the active mode, the function of the stopped data processing device is restored, the communication device is activated, and the measurement time of the timer in the active mode Is switched from the active mode to the sleep mode when the time coincides with the second determination reference time.
The sensor module according to claim 10,
The sensor module measures time in synchronization with a synchronization signal input from the outside of the sensor module.
The sensor module according to claim 11,
As the operation mode, there are an operation mode including the active mode and the sleep mode, and an initial activation mode in which the restriction on some of the functions is released,
The arithmetic control unit sets the operation mode to the initial activation mode after activation of the sensor module, and receives the measurement request instructing measurement of the state of the storage battery cell in the initial activation mode. The sensor module characterized by switching from the initial startup mode to the operation mode and starting timing for switching the operation mode.
The sensor module according to any one of claims 10 to 12,
The second determination reference time of the timer can be changed based on a correction time calculated based on a state of charge of the storage battery cell to be measured by the sensor module.
A plurality of storage battery cells, a sensor module that is provided corresponding to each of the plurality of storage battery cells, operates by supplying power from the corresponding storage battery cell, and measures the state of the corresponding storage battery cell, A method for controlling an energy storage system comprising a monitoring device that transmits a measurement request for instructing execution of measurement of the state of the storage battery cell and a data request for instructing transmission of a measurement result to a sensor module,
The sensor module has, as operation modes, a sleep mode in which a part of functions is restricted and an active mode in which the restriction of the part of functions is released, and the sensor module is active during a specified period. A first step that becomes a mode;
And a second step in which the sensor module enters the sleep mode during a period other than the designated period.
The method of controlling a power storage system according to claim 14,
The sensor module is classified into a plurality of groups, and a common period to be in the active mode is designated for each of the classified groups.
In the control method of the electrical storage system according to claim 14 or 15,
The first step includes a first active time including a scheduled time at which the sensor module receives a measurement request instructing measurement of the state of the storage battery cell from the monitoring device and a processing time required for measurement according to the measurement request. A third step of operating in the active mode in a period, a scheduled time at which the sensor module receives from the monitoring device a data request instructing transmission of measurement data including a measurement result of the measurement according to the measurement request; and A fourth step of operating in the active mode in a second active period including a processing time required for transmitting the measurement data in response to a data request;
The second step includes a fifth step of operating in the sleep mode during a period other than the first active period and the second active period.
The power storage system control method according to claim 16,
The first active periods of the sensor modules are set to be equal to each other, and the second active periods of the sensor modules are set to be equal to each other. Control method.
In the storage system control method according to claim 16 or 17,
A sixth step in which the monitoring device outputs a synchronization signal;
And a seventh step in which the sensor module performs a time measurement for switching the operation mode based on the synchronization signal.
The power storage system control method according to claim 18,
The measurement request includes the synchronization signal;
The sensor module has, as the operation mode, an operation mode including the active mode and the sleep mode, and an initial activation mode in which the restriction on some of the functions is released,
An eighth step in which the monitoring device transmits the measurement request to the sensor modules simultaneously;
A ninth step in which the sensor module is activated in the initial activation mode; and a timing for switching the operation mode when the sensor module receives a signal instructing execution of the measurement in the initial activation mode. And a ninth step of switching the operation mode from the initial startup mode to the operation mode.
In the storage system control method according to any one of claims 16 to 19,
A tenth step in which the monitoring device calculates a correction time based on a state of charge of the storage battery cell and transmits the correction time to the sensor module;
An eleventh step in which the sensor module changes a preset period of the active mode based on the correction time.
A plurality of storage battery cells, a sensor module that is provided corresponding to each of the plurality of storage battery cells and measures the state of the corresponding storage battery cell, and for each of the sensor modules, measurement of the state of the storage battery cell A power storage system control method comprising a monitoring device that transmits a measurement request for instructing execution and a data request for instructing transmission of a measurement result,
The monitoring method includes a step of transmitting the measurement request to the sensor modules all at once.