JP7189937B2 - Power storage system, sensor module, and control method for power storage system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric storage system, a sensor module, and a control method for an electric storage system, and more particularly, to an electric storage system having a sensor module that measures the state of a lead-acid battery and the sensor module.

In recent years, due to the demand for larger capacity storage batteries, a large storage battery module equipped with a multi-parallel storage battery module in which a single storage battery cell (single battery) such as a lead-acid battery or a storage battery string in which a plurality of storage battery cells are connected in series is connected in parallel. Large-scale power storage systems are becoming popular.

In such a power storage system, a sensor is used to monitor the state of the storage battery. For example, in Patent Document 1, a sensor module of a child device that measures the state of each storage battery cell and a sensor module of a parent device that relays communication between the sensor module of each child device and a device on the upper side are provided. An electrical storage system is disclosed.

Japanese Patent No. 5403191

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

Further, each sensor module of the child device is provided corresponding to each storage battery cell, and operates by power supply from the corresponding storage battery cell. That is, each sensor module operates by consuming the storage battery capacity of the corresponding storage battery cell.

In general, semiconductor integrated circuit devices are known to vary in current consumption (power consumption). For example, semiconductor integrated circuit devices such as MCUs and wireless ICs that are applied to the sensor modules described above vary in power consumption by a few percent for small ones, and even more for large ones. Therefore, in the power storage system described above, variations in power consumption also occur among the sensor modules provided for each storage battery cell.

Variations in power consumption among sensor modules cause variations in characteristics among the storage battery cells that supply power to the sensor modules. For example, variations in power consumption between sensor modules contribute to variations in remaining capacity (state of charge, SOC) between storage battery cells.

When the storage battery cells are repeatedly charged and discharged in such a state that the SOC varies among the storage battery cells, some storage battery cells are overcharged or overdischarged, which causes deterioration of the storage battery cells to progress.

In addition, this SOC variation can be eliminated by equalization charging that is periodically performed in the power storage system. If the SOC fluctuates during this period, it will lead to the above-described deterioration of the storage battery cells.

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

A power storage system according to a representative embodiment of the present invention is provided with a plurality of storage battery cells and correspondingly provided for each of the plurality of storage battery cells, operates by power supply from the corresponding storage battery cells, and monitoring for transmitting a sensor module for measuring the state of the 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 to each of the sensor modules; wherein the sensor module has, as operation modes, a sleep mode in which some functions are restricted and an active mode in which the restrictions on some functions are released, and the active mode is activated during a specified period of time. mode, and the sleep mode during the rest of the period.

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.

1 is a diagram showing a configuration of a power storage system according to Embodiment 1; FIG. 3 is a diagram showing the configuration of a sensor module in the power storage system according to Embodiment 1; FIG. 4 is a timing chart showing communication timings between the monitoring device and each sensor module in the power storage system according to Embodiment 1. FIG. 4 is a diagram showing an outline of switching of operation modes of the sensor module according to the first embodiment; FIG. 4 is a timing chart showing switching timings of operation modes of each sensor module in the power storage system according to Embodiment 1. FIG. FIG. 10 is a diagram showing the configuration of a power storage system according to Embodiment 2; FIG. 9 is a timing chart showing switching timings of operation modes of sensor modules for each group in the power storage system according to Embodiment 2. FIG. 9 is a timing chart when packet retransmission processing is not performed in each sensor module in the power storage system according to Embodiment 2. FIG. 9 is a timing chart when packet retransmission processing is performed in each sensor module in the power storage system according to Embodiment 2; FIG. 10 is a diagram showing the configuration of a sensor module in a power storage system according to Embodiment 3; FIG. 11 is a diagram for explaining operation modes of a sensor module in the power storage system according to Embodiment 3; 10 is a timing chart showing switching timings of operation modes of each sensor module in the power storage system according to Embodiment 3. FIG. FIG. 10 is a diagram showing the configuration of a sensor module in a power storage system according to Embodiment 4; FIG. 11 is a diagram for explaining a method for adjusting a period in which a sensor module is in an active mode in the power storage system according to Embodiment 4;

1. Outline of Embodiment First, an outline of a representative 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 described with parentheses.

[1] A power storage system (100, 100A to 100C) according to a representative embodiment of the present invention includes a plurality of storage battery cells (5, 5_1 to 5_n, 5_1 to 5_k) and corresponding to each of the plurality of storage battery cells. a sensor module (4, 4B, 4C) provided as a sensor module that operates by power supply from the corresponding storage battery cell and measures the state of the corresponding storage battery cell; and for each of the sensor modules, the 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; It is characterized by having a limited sleep mode and an active mode in which the limitation of the part of the functions is released, the active mode being in a specified period, and the sleep mode in other periods.

[2] In the power storage system (100A), the sensor modules may be classified into a plurality of groups (6_1 to 6_j), and a common period to be in the active mode may be specified for each of the classified groups. good.

[3] In the above power storage system, the sensor module receives a scheduled time (tk1) 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 in response to the measurement request ( Tk1) and operating in active mode during a first active period (Ta1), and scheduled time for receiving a data request instructing transmission of measurement data including the measurement result of the measurement in response to the measurement request from the monitoring device. (tk2) and a processing time (Tk2) required to transmit the measurement data in response to the data request, and operate in the active mode during the first active period and the second active period. 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 respective sensor modules are set to be equal to each other, and the second active periods of the respective sensor modules are set to be equal to each other. may

[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. may be timed.

[6] In the power storage system (100B), the measurement request includes the synchronization signal, the monitoring device simultaneously transmits the measurement request to each of the sensor modules (4B), and the sensor modules , as operation modes, an operation mode including the active mode and the sleep mode, and an initial start-up mode in which restrictions on some of the functions are lifted, wherein the sensor module is started in the initial start-up mode, When a signal instructing execution of the measurement is received in the initial start-up mode, timing may be started for switching the operation mode, and the operation mode may be switched from the initial start-up 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, and the sensor module calculates the correction time (Tc) at the correction time. 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 representative embodiment of the present invention is provided with a plurality of storage battery cells (5) corresponding to each of the plurality of storage battery cells. a sensor module (4, 4B, 4C) for measuring the state of the storage battery cell, and a measurement request for instructing execution of measurement of the state of the storage battery cell and transmission of the measurement result to each of the sensor modules. and a monitoring device (2) for transmitting a request for data to be measured, said monitoring device transmitting said request for measurement all at once to each of said sensor modules.

[9] According to a representative embodiment of the present invention, the sensor modules (4, 4B, 4C) that measure the state of the storage battery cell (5) are in a sleep mode in which some functions are restricted, and an active mode in which the restriction on the function of the unit is released, the active mode is set during a specified 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 external devices (3, 2), and a data processing device ( 42), wherein the data processing device includes a timer (423) that measures time, and arithmetic control that switches the operation mode based on the time measured by the timer and controls the communication device and the sensor unit. (421), wherein in the sleep mode, the arithmetic control unit stops the communication device and part of the functions of the data processing device, and during the sleep mode, the measurement time of the timer matches the first determination reference time (ts1, ts2), the operation mode is switched from the sleep mode to the active mode, the function of the data processing device that has been stopped is restored, and the communication device is activated. The active mode may be switched to the sleep mode when the measured time of the timer matches the second determination reference time (te1, te2) in the active 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] The sensor module (4B) has, as the operation modes, an operation mode including the active mode and the sleep mode, and an initial start-up mode in which restrictions on some of the functions are released, and After starting the sensor module, the control unit sets the operation mode to the initial startup mode, and sets the operation mode to the initial startup mode when a measurement request instructing measurement of the state of the storage battery cell is received in the initial startup mode. When the mode is switched 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 the 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 with a plurality of storage battery cells and correspondingly provided for each of the plurality of storage battery cells, and operates by power supply from the corresponding storage battery cells, Sensor modules for measuring the states of the corresponding storage battery cells, and transmission of measurement requests instructing execution of measurement of the states of the storage battery cells and data requests instructing transmission of measurement results to the respective sensor modules. and a monitoring device for controlling a power storage system. The sensor module has, 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. A control method for the power storage system includes a first step in which the sensor module is placed in the active mode during a specified period, and a second step in which the sensor module is placed in the sleep mode during a period other than the specified period. and

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

[16] In the above control method for a power storage system, the first step includes determining a scheduled time at which the sensor module receives from the monitoring device a measurement request instructing measurement of the state of the storage battery cell, and 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 instructing the sensor module to transmit measurement data including measurement results of the measurement in response 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 from the monitoring device and a processing time required to transmit the measured data in response to the data request, wherein the second step may include a fifth step of operating in the sleep mode during periods other than the first active period and the second active period.

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

[18] In the above control method for a power storage system, a sixth step in which the monitoring device outputs a synchronization signal; 7 steps.

[19] In the above control method for a power storage system, the measurement request includes the synchronization signal, and the sensor module has, as the operation modes, an operation mode including the active mode and the sleep mode, and an operation mode of the partial function. an unrestricted initial startup mode, wherein the monitoring device sends the measurement request to each of the sensor modules in unison; and the sensor modules are activated in the initial startup mode. and a ninth step, when the sensor module receives a signal instructing execution of the measurement in the initial activation mode, starts timing for switching the operation mode, and changes the operation mode to the initial state. and a ninth step of switching from a startup mode to the operational mode.

[20] In the above control method for a power storage system, a tenth step in which 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; and an eleventh step of changing the preset active mode period based on.

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

2. Specific Examples of Embodiments Specific examples of embodiments of the present invention will be described below with reference to the drawings. In the following description, constituent elements common to each embodiment are denoted by the same reference numerals, and repeated descriptions are omitted. Also, it should be noted that the drawings are schematic, and the relationship of dimensions of each element, the ratio of each element, and the like may differ from reality. Even between the drawings, there are cases where portions with different dimensional relationships and ratios are included.

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

As shown in FIG. 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 (where n is an integer equal to or greater than 2), a sensor module 3 as a parent device, sensor modules 4_1 to 4_n as a child device, and a monitoring device 2. there is

The storage battery cells 5_1 to 5_n are, for example, lead-acid battery cells configured to be capable of charging and discharging electric power. The storage battery cells 5_1 to 5_n are, for example, connected in series to form an assembled battery.

In this specification, when the storage battery cells 5_1 to 5_n are not distinguished, they may simply be referred to as "storage battery cell 5".

The sensor modules 4_1 to 4_n are devices that operate as child devices. That is, the sensor modules 4_1 to 4_n are provided corresponding to each of the plurality of storage battery cells 5_1 to 5_n, and are devices for measuring 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 electric 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 of the functions are restricted and an active mode in which the restrictions on some of the functions are released, and are in the active mode during a specified period, The sleep mode is entered during the rest of the period.

Here, the above partial functions include, for example, a communication function for transmitting and receiving data between the sensor modules 4_1 to 4_n and the monitoring device 2 (sensor module 3). Further, the above partial functions may include a measurement function in which the sensor modules 4_1 to 4_n measure the states of the storage battery cells 5_1 to 5_n to be measured.

For example, the sensor modules 4_1 to 4_n stop the communication function and the measurement function in the sleep mode and operate in a power saving state, and in the active mode, the restriction on the communication function and the measurement function is released and the sensor module 4_1 to 4_n enters a normal operation state. 2, and measures the states of the storage battery cells 5_1 to 5_n.

Note that when the sensor modules 4_1 to 4_n are not distinguished from each other, they may be simply referred to as "storage battery cell 5". Details of the sensor module 4 will be described later.

The sensor module 3 is a device that operates as a parent device. That is, the sensor module 3 is a device that relays communication between the sensor modules 4_1 to 4_n as child devices 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 also performs wired communication (for example, serial communication) with the monitoring device 2 .

A monitoring device (BMU: Battery Management Unit) 2 is a device for monitoring and diagnosing the state of each storage battery cell 5_1 to 5_n. The monitoring device 2 communicates with the sensor modules 4_1 to 4_n as child devices via the sensor module 3 as the parent device, thereby monitoring the states of the storage battery cells 5_1 to 5_n measured by the sensor modules 4_1 to 4_n. Get 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 obtained measurement data, and transmits the diagnosis results and the like to the host device 1 as necessary.

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

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. The measurement data including the results are sent to the monitoring device 2 .

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

Next, the sensor module 4 will be described in detail.
FIG. 2 is a diagram showing a configuration of sensor module 4 in power storage system 100 according to Embodiment 1. As shown in FIG.

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

The sensor module 4 includes a sensor section 40 , a communication device 41 and a data processing device 42 . Note that the sensor module 4 includes various peripheral circuits such as a power supply circuit in addition to the functional units described above, but the 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 section 40 has, 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 wirelessly communicating with the sensor module 3 via the antenna.

The communication device 41 (wireless IC) is controlled by the data processing device 42 to perform and stop its operation, as will be described later.

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 has an arithmetic control unit 421 and a timer 423 as functional blocks. These functional units are realized by, for example, a CPU core provided 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. be done.

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

Storage unit 425 stores time information that serves 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, as information on the judgment reference time that serves as a judgment reference for switching the operation mode, for example, information on the first judgment reference time for switching the sensor module 4 from the sleep mode to the active mode (hereinafter referred to as "active mode start time 4250 and information 4251 of a 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, and determines the measurement time. If the time coincides with the reference time, it outputs a determination signal Vd indicating the determination result.

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 (for example, 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 section 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 time measured by the timer 423 and controls the communication device 41 and the sensor unit 40 to realize the main functions of the sensor module 4 .

When the time measured by the timer 423 matches 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, and switches the active mode. When the time measured by the timer 423 matches the second determination reference time based on the active mode end time information 4251 in the mode, 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 has an operation mode register 4220 that stores values indicating operation modes. Arithmetic control unit 421 updates the setting value of operation mode register 4220 according to the switching of the logic level of determination signal Vd output from determination unit 426 of timer 423, and also updates the setting value of operation mode register 4220. It controls the communication device 41, the sensor unit 40, and the like.

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

The arithmetic control unit 421 stops part of the data processing device 42 and the communication device 41 in the sleep mode, and restores the function of the data processing device 42 that has been stopped and stops the communication device 41 in the active mode. to start.

More specifically, the arithmetic control unit 421 stops the communication function of the communication device 41 when the setting value of the operation mode register 4220 switches from the active mode to the sleep mode. For example, the arithmetic control unit 421 controls a power supply circuit (not shown) to stop power supply to the communication device 41 (wireless IC), thereby controlling external devices (the sensor module 3 and the monitoring device 2) of the communication device 41. Stop the communication function. Alternatively, if the wireless IC, which is a component of the communication device 41, has a normal operation mode and a power saving mode, the arithmetic control unit 421 causes the wireless IC to shift from the normal operation mode to the power saving mode. to stop the function of the communication device 41 to communicate with external devices (sensor module 3 and monitoring device 2). At this time, the arithmetic control unit 421 may stop not only the communication device 41 but also the sensor unit 40 .

Further, when the setting value of the operation mode register 4220 switches 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, if the MCU as the data processing device 42 has a normal operation mode and a power saving mode, the arithmetic control unit 421 causes the data processing device 42 to shift from the normal operation mode to the power saving mode. At this time, for example, the timer 423 performs normal operation, and the arithmetic control unit 421 stops part of its operation.

On the other hand, when the setting value of the operation mode register 4220 switches 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 42 functions are 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 were stopped in the sleep mode. For example, the arithmetic control unit 421 controls a power supply circuit (not shown) to restart the power supply to the communication device 41 (wireless IC), so that the external devices (the sensor module 3 and the monitoring device 2) of the communication device 41 and the Restore the ability to communicate. Alternatively, when the wireless IC that constitutes 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 41 (sensor module 3 and monitoring device 2).

When the sensor unit 40 is also stopped in the sleep mode, it is restored 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 communication timings between the monitoring device 2 and 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 each sensor module 4_1 to 4_n is 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 periodically, for example, in order to monitor and diagnose the states of the storage battery cells 5_1 to 5_n.

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

This makes it possible to measure the states of the storage battery cells 5_1 to 5_n at the same time, 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 timings 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 the measurement data after the measurement processing corresponding to the measurement request by each of 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 transmits the measurement data including the measurement results of the state (voltage and temperature) of the storage battery cells 5_1 to 5_n measured in response to the immediately preceding 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 transmits measurement data to the monitoring device 2 in order from the sensor modules 4_1 to 4_n that received the data request.

A period from when the monitoring device 2 transmits a measurement request to when 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 modes 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. This figure representatively shows the switching timing of the operation mode of one sensor module 4 .

As described above, in the power storage system 100, the sensor module 4 operates in active mode during a specific period, and operates in 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 required to perform measurement in response to the measurement request. It operates in an active mode during a period (hereinafter also referred to as “first active period Ta1”).

Further, as shown in FIG. 4, the sensor module 4 has a period ( hereinafter also referred to as “second active period Ta2”). On the other hand, during periods other than the first active period Ta1 and the second active period Ta2, each of the sensor modules 4_1 to 4_n operates in sleep mode.

In order to operate the sensor module 4 as shown in FIG. 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 as 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. FIG.

Note that the start times ts1 and ts2 and the end times te1 and te2 are used when the scheduled times for receiving measurement requests and data requests are deviated, when the processing time for measurement and data transmission varies, and when data transmission/reception fails. It is preferable to set it in consideration of the time required for retransmission and the like.

FIG. 5 is a timing chart showing operation mode switching timings 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, 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_n, the values of the start time ts1 and end time te1 of the common first active period Ta1 are set respectively. be.

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 for the data response, appropriate values of the start time ts2 and the end time te2 of the second active period Ta2 are set to the active period. Mode start time information 4250 and active mode end time information 4251 are set in the storage units 425 of the timers 423 of the sensor modules 4_1 to 4_n.

For example, as shown in FIG. 5, 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. be.

Also, the 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, the values of the start time ts2_n and the end time te2_n of the second active period Ta2_n 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_n.

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 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 active mode operation period of each of the sensor modules 4_1 to 4_n is the same. 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 is possible to control the power consumption of each of the sensor modules 4_1 to 4_n to be equal in one assembled battery measurement period.

As described above, according to the power storage system according to Embodiment 1, each of the plurality of storage battery cells 5_1 to 5_n is provided and operates by receiving power supply from the corresponding storage battery cells 5_1 to 5_n, and the corresponding storage battery cells 5_1 to 5_n have a sleep mode in which some functions are restricted and an active mode in which some functions are unrestricted, and are active during specified periods mode, and sleep mode during other periods.

According to this, in the power storage system including the sensor modules, it is possible to reduce the power consumption of each sensor module, thereby reducing the influence of the power supply from each storage battery cell to each sensor module on the SOC of each storage battery cell. can do This makes it possible to suppress variations in characteristics, that is, SOC, between storage battery cells.

Specifically, the sensor modules 4_1 to 4_n each receive 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 in response to the measurement request, and data from the monitoring device 2. Operate in active mode during a second active period including the scheduled time to receive the request and the processing time required to transmit the measurement data in response to the data request, and sleep mode during periods other than the first active period and the second active mode works with

According to this, it is possible to suppress the power consumption of the sensor modules 4_1 to 4_n and suppress the variation in SOC among the storage battery cells while appropriately executing the process in response to the request from the monitoring device 2 .

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, it is possible to control the power consumption of each of the sensor modules 4_1 to 4_n to be equal during one assembled battery measurement period. can be suppressed. This makes it possible to further suppress variations in SOC among the storage battery cells 5_1 to 5_n.

<<Embodiment 2>>
FIG. 6 is a diagram showing a configuration of a power storage system according to Embodiment 2. FIG.
The power storage system 100A according to Embodiment 2 differs from Embodiment 1 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. The power storage system 100 is different from the power storage system 100 and is similar to the power storage system 100 according to the first embodiment in other respects.

In power storage system 100A according to Embodiment 2, sensor modules 4 are classified into a plurality of groups, and a common period to be in the active mode 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 in series to form an assembled battery. is divided into j (n is an integer equal to or greater than 2) groups 6_1 to 6_j. Groups 6_1 to 6_j include, for example, k (k is an integer equal to or greater than 1) sensor modules 4_1 to 4_k, respectively. Note that when the groups 6_1 to 6_j are not distinguished from each other, they may simply be 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 each of 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 from the sleep mode to the active mode at a predetermined time with the monitoring device 2. .

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

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. "te1" is set as the end time of .

On the other hand, in the power storage system 100</b>A, 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 for each of 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 timers 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 ending time of the second active period Ta2_1.

In addition, “time ts2_2” is set as the information of the start time of the second active period Ta2_2 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_k of the group 6_2. “Time te2_2” is set as the information of the end time of the two active periods Ta2_2.

Similarly, 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_k of the group 6_j, "time ts2_n" is set as information of the start time of the second active period Ta2_j, “Time te2_n” is set as the information of 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 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 a data request transmitted from the monitoring device 2 and transmit a data response to the data request. It is necessary to establish so that

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_k belonging to the same group 6 It is sufficient if it is greater than the total sum of processing times required for 4_k data responses)+(preparation time Te for data retransmission determined by the system).

The standby time Te for data retransmission determined by the system is used when transmission and 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. is the time required to resend a packet that is

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

Therefore, in the power storage system 100A, when the communication between the sensor modules 3 and 4 fails, the data retransmission function of the wireless ICs mounted on the sensor modules 3 and 4 is used to perform measurement processing and data collection processing. Retransmission processing of various packets related to such as is performed. It is necessary to design the system so that the packet retransmission related to the data collection process is within the spare time for data retransmission determined by the system in each group 6 .

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

8A and 8B show timing charts when the sensor modules 4_1 to 4_k in one group 6 respond to data. In FIGS. 8A and 8B, as described above, the sum of the processing times required for data response 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. Then, assume that the second active time Ta2 is set.

As shown in FIG. 8A, when the data response is successfully completed without packet retransmission processing in each of the sensor modules 4_1 to 4_k, the preliminary After the time Te has elapsed, the sensor modules 4_1 to 4_k transition from the active mode to the sleep mode.

On the other hand, as shown in FIG. 8B, for example, when the sensor module 4_1 fails to transmit a packet relating to the data response, the sensor module 4_1 performs packet retransmission processing. 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 sensor modules 4_3 to 4_k subsequent to the sensor module 4_2 deviate in timing of data request reception and packet transmission. Also, if the packet retransmission process is performed in the sensor modules 4_2 to 4_k, the timing of each process in each of the sensor modules 4_2 to 4_k is further shifted.

Therefore, as shown in FIGS. 8A and 8B, by setting the preliminary time Te in consideration of the case where the packet related to the data response is retransmitted in each of the sensor modules 4_1 to 4_k, the second active period Ta2 is set. , 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, it is preferable that the number of sensor modules 4 belonging to each group 6_1 to 6_j is 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 j-th group 6_j is set to the number of sensors belonging to each of 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 modules 4 are classified into a plurality of groups 6_1 to 6_j, and a common period to be in the active mode is specified for each of the classified groups 6_1 to 6_j. .

According to this, 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 child units. Even when the sensor modules 4_1 to 4_k are installed in the system, it is possible to simplify the time setting work and management work for switching the operation mode of each sensor module 4_1 to 4_k.

<<Embodiment 3>>
FIG. 9 is a diagram showing the configuration of a sensor module in the power storage system according to Embodiment 3. FIG.
The power storage system 100B according to Embodiment 3 differs from the power storage system 100 according to Embodiment 1 in that the sensor module measures time for switching the operation mode based on the synchronization signal. , 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 synchronizing signal Vs to each of the sensor modules 4B_1 to 4B_n as slave units via the sensor module 3 as the master unit.

Here, the synchronization signal Vs sets the time axis related to the switching of the operation mode in each sensor module 4B_1 to 4B_n as the timing (time ) is a signal for synchronizing with the reference time axis.

Each sensor module 4B_1 to 4B_n measures time 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 sent to the sensor modules 4B_1 to 4B_n all at once. Each of the sensor modules 4B_1 to 4B_n synchronizes the time of its own timer 423B based on 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, reset the count value of the counter 424B.

According to this, every time a measurement request is transmitted from the monitoring device 2B, the time axis related to switching of the operation modes of the sensor modules 4B_1 to 4B_n can be synchronized with the time axis related to packet transmission of the monitoring device 2B. Therefore, the sensor modules 4B_1 to 4B_n can switch operation modes and transmit/receive packets at appropriate timings.

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, in order to more reliably realize the switching of the operation mode and the appropriate processing according to the request from the monitoring device 2B, another operation mode is used. It is preferable to provide A detailed description will be given below.

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

Here, the initial startup mode is an operation mode in which restrictions on some functions of the sensor module 4B are released. Specifically, the initial startup mode is an operation mode in which at least the restriction on the communication function of the sensor module 4B is lifted and communication with the monitoring device 2B is possible. For example, the initial operating mode may be the same mode as the active mode described above. In this embodiment, as an example, it is assumed that the initial operation mode is the same 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, switch the operation mode from the initial activation mode to the operation mode. , starts timing for switching between operating modes (active mode and sleep mode) within the operating mode.

FIG. 11 is a timing chart showing operation mode switching timings 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, assume that the sensor modules 4B_1 to 4B_n are activated at different timings. After startup (for example, after power-on reset is released), the data processing device 42B of each sensor module 4B_1 to 4B_n first sets a value designating the "initial startup mode" in the operation mode register 4220. FIG. As a result, the sensor modules 4B_1 to 4B_n are in a state in which the restriction on the functions of the sensor modules 4B_1 to 4B_n is released, that is, in a state in which communication with the monitoring device 2B and measurement of the storage battery cells 5 are possible, as in the active mode. becomes.

Next, suppose that the monitoring device 2B simultaneously transmits a measurement request to each of the sensor modules 4B_1 to 4B_n, and each of the sensor modules 4B_1 to 4B_n receives the measurement request 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 set value of the mode register 4220 is switched to "operation mode (active mode)". As a result, the sensor modules 4B_1 to 4B_n are synchronized with the monitoring device 2B, and the sensor modules 4B_1 to 4B_n operate in the active mode.

After that, as in the sensor module 4 according to the first embodiment, the counter 424B starts counting (clocking) in the timer 423B, and the determination unit 426 detects the count value of the counter 424B and the active mode set in the storage unit 425. Based on start time information 4250 and active mode end time information 4251, the logic level of 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 measures time for switching the operation mode based on the synchronization signal Vs output from the monitoring device 2B. can be synchronized with the time axis that serves as a reference for the timing (time) of sending packets 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 the measurement request and data request from the monitoring device 2B.

In general, when a sensor module is connected to a storage battery cell during installation or maintenance of a power storage system, the sensor module is quickly powered on and starts operating. Therefore, during construction of the power storage system or the like, the sensor modules may start up at different timings and the sensor modules may not be 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 restrictions on some functions are released. When the measurement request sent all at once from the monitoring device 2B to each sensor module 4B is received, 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 if each sensor module 4B is activated at different timings during construction of the power storage system 100A, each sensor module 4B receives the measurement request broadcasted from the monitoring device 2B. , synchronization between the sensor modules 4B, and synchronization between each sensor module 4B and the monitoring device 2B. As a result, each sensor module 4B can more reliably respond to the measurement request and data request from the monitoring device 2B while reducing the power consumption of the sensor module 4B.

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

The power storage system 100C according to Embodiment 4 differs from the power storage system 100 according to Embodiment 1 in that the period during which the sensor modules operate in the active mode can be adjusted. This is the same as the power storage system 100 according to No. 1.

In general, each sensor module attached to a storage battery cell has a sleep mode operation period as in Embodiments 1 to 3 described above to reduce power consumption. Due to individual differences and the like, variations in SOC may occur between storage battery cells during system operation.

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

FIG. 13 is a diagram for explaining a method for adjusting the 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.

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 4C, as standard control, controls the second active period Ta2 based on the information stored in the storage unit 425, similarly to the sensor module 4 according to the first embodiment. to decide.

Here, consider a case where there is a deviation (difference) between the SOC of the storage battery cell 5 corresponding to the sensor module 4C and the SOC of the other storage battery cells 5 . In this case, the deviation in the SOC of the storage battery cell 5 is due to variations in the characteristics of the storage battery cell 5 itself, deviation in power consumption between the sensor module 4C connected to the storage battery cell 5 and the other sensor modules 4C, and the like. thought to be the 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 cells 5 . The monitoring device 2C transmits the calculated correction time Tc to the sensor module 4C to be corrected. The sensor module 4C, for example, stores the received correction time Tc as correction time information 4252 in the storage unit 425 of the timer 423, and changes the end time of the active mode period 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 modules 4C, the monitoring device 2C lengthens the second active period Ta2 of the sensor module 4C to increase the power consumption of the storage battery cells 5. Tc is calculated and transmitted to the sensor module 4C.

Based on the received correction time Tc, the sensor module 4C calculates, for example, the time (te2+Tc) obtained by adding the correction time Tc to the preset end time te2 of the second active period Ta2 as 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). As a result, as shown in (b) of FIG. 13, 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 SOC of the other sensor modules 4C, the monitoring device 2C shortens the second active period Ta2 of the sensor module 4C to reduce the power consumption of the storage battery cells 5. Tc is calculated and transmitted to the sensor module 4C.

Based on the received correction time Tc, the sensor module 4C, for example, subtracts the correction time Tc from the preset end time te2 of the second active period Ta2, and sets the time (te2-Tc) as a new second active period. Let it be 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 (b) of FIG. 13, the second active period Ta2 of the sensor module 4C becomes shorter than the initial period by the correction time Tc.

After that, when the deviation between the SOC of the sensor module 4C and the SOC of the other sensor module 4C is eliminated, the sensor module 4C returns to standard control (see (a) of FIG. 13). 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 Embodiment 4, 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 state of charge 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 active mode period based on the received correction time Tc.

According to this, even if there is a difference between the SOC of a specific storage battery cell 5 and the SOC of other storage battery cells 5 due to a difference in the individual characteristics of the storage battery cell 5 itself, the specific storage battery cell 5 The active period of the sensor module 4C receiving power supply from the storage battery cell 5 can be made different from the active period of the other sensor modules 4C. As a result, it is possible to adjust the power consumption between the storage battery cells 5 to be equal, so that the deviation of the SOC between the storage battery cells 5 can be further reduced.

<<Expansion of Embodiment>>
Although the invention made by the inventors of the present invention has been specifically described above based on the embodiments, it goes without saying that the invention is not limited thereto, and that various modifications can be made without departing from the gist of the invention. stomach.

For example, in the above-described fourth embodiment, as an example of a method for adjusting the period during which the sensor module 4C operates in the active mode, the case of adjusting the second active period Ta2 was illustrated. can be adjusted.

Moreover, in the said Embodiment 4, although 2 C of monitoring apparatuses illustrated the case where the correction|amendment time Tc was calculated based on the charge state of the storage battery cell 5, 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 2C transmits SOC information 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 send a packet including the SOC information of each storage battery cell 5 at a timing different from the data request packet. It may be sent to the sensor module 4 .

In addition, in the above-described embodiment, the case where the sensor module 3 of the parent device relays the communication between the sensor module 4 of the child device and the monitoring device 2 was exemplified, but the present invention is not limited to this. Direct wireless communication may be performed between the sensor module 4 of the slave unit and the monitoring device 2 .

Further, in Embodiments 3 and 4, the function of synchronizing each sensor module 4 and monitoring device 2 and the function of adjusting the period during which each sensor module 4 is in the active mode are included in the power storage system 100 according to Embodiment 1. However, it is not limited to this, and each function described above may be applied to the other embodiments 2 to 4 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) composed of 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 to each string. For example, in one string, the sensor modules 4_1 to 4_n are divided into a plurality of groups 6_1 to 6_j, and the sensor modules 4 are controlled for each group as in the second embodiment.

1... host device (EMS), 2, 2B, 2C... monitoring device, 3... sensor module (parent device), 4, 4B, 4C, 4_1 to 4_n, 4_k, 4B_1 to 4B_n, 4C_1 to 4C_n... sensor module, 5 , 5_1 to 5_n, 5_k... storage battery cells, 6, 6_1 to 6_j... groups, 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 Calculation control unit 423, 423B, 423C Timer 424 Counter 425 Storage unit 426 Determination Section 4220 Operation mode register 4250 Active mode start time information 4251 Active mode end time information 4252 Correction time information Vs Synchronization signal.

Claims (19)

a plurality of battery cells;
a sensor module provided corresponding to each of the plurality of storage battery cells, operated by power supply from the corresponding storage battery cell, and measuring 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 measurement results 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 the restrictions on some of the functions are released. The sleep mode is entered during the period of
the sensor modules are classified into a plurality of groups, and a common period to be in the active mode is specified for each of the classified groups;
The power storage system, wherein the timing at which each of the sensor modules enters the active mode for receiving the measurement request is set to be the same regardless of the group. In the power storage system according to claim 1,
The sensor module is in the active mode during 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 in response to the measurement request. Scheduled time for operating and receiving from the monitoring device a data request instructing transmission of measurement data including measurement results of measurement in response to the measurement request, and processing time required to transmit the measurement data in response to the data request. and operating in the active mode during a second active period, and operating in the sleep mode during a period other than the first active period and the second active period. In the power storage system according to claim 2 ,
The first active periods of the respective sensor modules are set to be equal to each other, and the second active periods of the respective sensor modules are set to be equal to each other. . In the power storage system according to claim 2 or 3 ,
The monitoring device outputs a synchronization signal,
The power storage system, wherein the sensor module measures time for switching the operation mode based on the synchronization signal. In the power storage system according to claim 4 ,
the measurement request includes the synchronization signal;
wherein the monitoring device broadcasts the measurement request to each of the sensor modules;
The sensor module has, as the operation modes, an operation mode including the active mode and the sleep mode, and an initial start-up mode in which restrictions on some of the functions are lifted,
The sensor module starts up in the initial start-up mode, and when receiving a signal instructing execution of the measurement in the initial start-up mode, starts timing for switching the operation mode, and changes the operation mode. A power storage system characterized by switching from the initial activation mode to the operation mode. In the power storage system according to any one of claims 2 to 5 ,
The monitoring device calculates a correction time based on the state of charge of the storage battery cell and transmits it 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 battery cells;
a sensor module provided corresponding to each of the plurality of storage battery cells and measuring 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 measurement results 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 the restrictions on some of the functions are released,
the monitoring device simultaneously transmitting the measurement request to each of the sensor modules;
the sensor modules are classified into a plurality of groups, and a common period to be in the active mode is specified for each of the classified groups;
The power storage system, wherein the timing at which each of the sensor modules enters the active mode for receiving the measurement request is set to be the same regardless of the group. A sensor module for measuring the state of a storage battery cell,
The sensor module has, 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. During periods other than the sleep mode,
The sensor module changes the preset active mode period based on the received correction time ,
The sensor module is
a sensor unit that detects the state of the storage battery cell;
a communication device for communicating with an external device;
a data processing device that performs data processing;
The data processing device is
a timer for timing;
an arithmetic control unit that switches the operation mode based on the time measured by the timer and controls the communication device and the sensor unit;
In the sleep mode, the arithmetic control unit suspends the communication device and suspends part of the functions of the data processing device, and during the sleep mode, the measurement time of the timer coincides with a first determination reference time. In this case, the operation mode is switched from the sleep mode to the active mode to restore the function of the data processing device that has been stopped, and the communication device is activated, and the measuring time of the timer is set in the active mode. when matches the second criterion time, switching from the active mode to the sleep mode;
The second determination reference time of the timer can be changed based on a correction time calculated based on the state of charge of the storage battery cell to be measured by the sensor module.
A sensor module characterized by: In the sensor module according to claim 8 ,
The sensor module, wherein the timer measures time in synchronization with a synchronization signal input from the outside of the sensor module. In the sensor module according to claim 9 ,
As the operation modes, an operation mode including the active mode and the sleep mode, and an initial startup mode in which restrictions on some of the functions are released,
The arithmetic control unit sets the operation mode to the initial startup mode after the sensor module is started, and sets the operation mode to the operation mode when a measurement request instructing measurement of the state of the storage battery cell is received in the initial startup mode. A sensor module that switches from the initial activation mode to the operation mode and starts timing for switching the operation mode. a plurality of storage battery cells, a sensor module provided corresponding to each of the plurality of storage battery cells, operated by power supply from the corresponding storage battery cell, and measuring the state of the corresponding storage battery cell;
A control method for a power storage system, comprising: a monitoring device that transmits a measurement request instructing execution of measurement of the state of the storage battery cell and a data request 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 the restrictions on some of the functions are released,
a first step in which the sensor module is in the active mode for a specified period of time;
a second step in which the sensor module is in the sleep mode for a period other than the specified period;
the sensor modules are classified into a plurality of groups, and a common period to be in the active mode is specified for each of the classified groups;
A control method for an electric storage system, wherein the timing at which each of the sensor modules enters the active mode for receiving the measurement request is set to be the same regardless of the group. In the control method of the power storage system according to claim 11 ,
In the first step, the sensor module receives a measurement request for 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 said active mode for a period of time;
A scheduled time at which the sensor module receives a data request for instructing transmission of measurement data including a measurement result of measurement in response to the measurement request from the monitoring device, and a process required to transmit the measurement data in response to the data request. and a fourth step of operating in said active mode for a second active period comprising:
The method of controlling an electric storage system, wherein 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. In the control method of the power storage system according to claim 12 ,
The first active periods of the respective sensor modules are set to be equal to each other, and the second active periods of the respective sensor modules are set to be equal to each other. control method. In the control method of the power storage system according to claim 12 or 13 ,
a sixth step in which the monitoring device outputs a synchronization signal;
and a seventh step in which the sensor module measures time for switching the operation mode based on the synchronization signal. In the control method of the power storage system according to claim 14 ,
the measurement request includes the synchronization signal;
The sensor module has, as the operation modes, an operation mode including the active mode and the sleep mode, and an initial start-up mode in which restrictions on some of the functions are lifted,
an eighth step in which the monitoring device broadcasts the measurement request to each of the sensor modules;
a ninth step in which the sensor module starts up in the initial start-up mode;
When the sensor module receives a signal instructing execution of the measurement in the initial start-up mode, the sensor module starts timing for switching the operation mode and changes the operation mode from the initial start-up mode to the operation mode. and a ninth step of switching to . In the control method for the power storage system according to any one of claims 12 to 15 ,
a tenth step in which 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;
and an eleventh step of changing a preset period during which the sensor module is in the active mode based on the correction time. a plurality of storage battery cells; a sensor module provided corresponding to each of the plurality of storage battery cells and measuring the state of the corresponding storage battery cell; A control method for a power storage system including a monitoring device that transmits a measurement request that instructs execution and a data request that instructs transmission of measurement results,
The sensor module has, 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,
said monitoring device sending said measurement request to each of said sensor modules in unison;
the sensor modules are classified into a plurality of groups, and a common period to be in the active mode is specified for each of the classified groups;
A control method for an electric storage system, wherein the timing at which each of the sensor modules enters the active mode for receiving the measurement request is set to be the same regardless of the group. a plurality of battery cells;
a sensor module provided corresponding to each of the plurality of storage battery cells, operated by power supply from the corresponding storage battery cell, and measuring 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 measurement results 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 the restrictions on some of the functions are released. The sleep mode is entered during the period of
The monitoring device calculates a correction time based on the state of charge of the storage battery cell and transmits it 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 provided corresponding to each of the plurality of storage battery cells, operated by power supply from the corresponding storage battery cell, and measuring the state of the corresponding storage battery cell; A control method for a power storage system, comprising: a monitoring device that transmits a measurement request instructing execution of measurement of the state of the storage battery cell and a data request instructing transmission of a measurement result to a sensor module,
The sensor module has, 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,
a first step in which the sensor module is in the active mode for a specified period of time;
a second step in which the sensor module is in the sleep mode for a period other than the specified period;
a third step in which 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;
and a fourth step of changing a preset period during which the sensor module is in the active mode based on the correction time.

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