JP6511632B2 - Storage battery system, method and program - Google Patents

Description

  Embodiments of the present invention relate to a storage battery system, method and program.

  In recent years, secondary batteries with high energy density and long life like lithium ion batteries have been developed, and are not limited to use as storage battery systems for vehicles, and stationary storage battery systems for the purpose of stabilization of electric power system etc. The use for is expanding.

  The operation method of these storage systems is largely different depending on the user (or application system). For example, it is not necessary to worry about the life of the storage system and want to use the depth of discharge deeply or long even if the use of some storage systems is restricted There are various things that you want to keep using.

  Therefore, a battery state diagnosis system is desired which can present or automatically control an operation mode suitable for the user (or application system) judging from the use condition and use condition of the storage system.

JP, 2010-119223, A Unexamined-Japanese-Patent No. 2004-222472 JP, 2008-024124, A International Publication No. 2011/062011

  However, the conventional battery state diagnosis system can only be used, for example, to improve the life of the battery, and does not necessarily present or automatically control the operation mode appropriate for the user (or application system).

  The present invention has been made in view of the above, and it is an object of the present invention to provide a storage battery system, method and program capable of presenting or automatically controlling an operation mode appropriate for the user (or application system). .

The storage unit of the storage battery system according to the embodiment stores, in advance, the correspondence between the SOC frequency distribution pattern during operation of the storage battery device defined by the SOC lower limit value and the SOC upper limit value and the control parameter of the storage battery device.
The determination unit determines the frequency distribution pattern of the SOC with respect to the frequency distribution of the predetermined period of the SOC of the storage battery device measured every predetermined time during operation, and is defined by the SOC lower limit value and the SOC upper limit value with reference to the storage unit. Control parameters of the storage battery device are determined so as to limit the SOC of the storage battery device within the SOC range .

FIG. 1 is a schematic configuration diagram of a natural energy power generation system provided with the storage battery system of the embodiment. FIG. 2 is a schematic configuration block diagram of the storage battery system of the embodiment. FIG. 3 is a diagram showing the detailed configuration of the cell module, CMU and BMU. FIG. 4 is a main part functional block diagram of the first embodiment. FIG. 5 is a function explanatory diagram of the stay map recording unit. FIG. 6 is an explanatory diagram of a stay map of the SOC of the first pattern. FIG. 7 is an explanatory diagram of a stay map of the SOC of the second pattern. FIG. 8 is an explanatory diagram of a stay map of the SOC of the third pattern. FIG. 9 is an operation processing timing chart of the first embodiment. FIG. 10 is a process flowchart of the storage battery controller. FIG. 11 is a main part functional block diagram of the second embodiment. FIG. 12 is an operation processing timing chart of the second embodiment. FIG. 13 is a functional block diagram of relevant parts of the third embodiment. FIG. 14 is a main part functional block diagram of the fourth embodiment. FIG. 15 is a functional block diagram of essential parts of the fifth embodiment.

Embodiments will now be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a natural energy power generation system provided with the storage battery system of the embodiment.

  The natural energy power generation system 100 functions as an electric power system, utilizes natural energy (renewable energy) such as solar power, water power, wind power, biomass, geothermal energy, etc., and can be output as grid power. The surplus power of the natural energy generation unit 1 is charged based on the measurement results of the power meter 2 for measuring the generated power of the energy generation unit 1, the wind power and the power meter 2, and the shortage power is discharged to A storage battery system 3 that outputs superimposed power on generated power, a transformer 4 that performs voltage conversion of output power of natural energy generation unit 1 (including when output power of storage battery system 3 is superimposed), storage battery system 3 Control of the storage battery controller 5 that performs local control of the It includes a host controller 6 for the.

FIG. 2 is a schematic configuration block diagram of the storage battery system of the embodiment.
Storage battery system 3 is roughly classified into storage battery device 11 for storing electric power and a power conversion device for converting DC power supplied from storage battery device 11 into AC power having a desired power quality and supplying it to a load (PCS: Power Conditioning System) 12).

Storage battery device 11 roughly includes a plurality of battery board units 21-1 to 21-N (N is a natural number) and battery terminal board 22 to which battery board units 21-1 to 21-N are connected. ing.
The battery panel units 21-1 to 21-N include a plurality of battery panels 23-1 to 23-M (M is a natural number) connected in parallel to one another, a gateway device 24, and a BMU (Battery Management Unit: battery) described later. And a DC power supply device 25 for supplying DC power for operation to a management device) and a CMU (Cell Monitoring Unit: cell monitoring device).

Here, the configuration of the battery unit will be described.
The battery boards 23-1 to 23-M respectively output power via the high potential side power supply line (high potential side power supply line) LH and the low potential side power supply line (low potential side power supply line) LL. Lines (output power supply lines; bus lines) LHO and LLO are connected to supply power to the power conversion device 12 which is a main circuit.

Since the battery packs 23-1 to 23-M have the same configuration, the battery pack 23-1 will be described as an example.
The battery board 23-1 can be roughly divided into a plurality of (24 in FIG. 1) cell modules 31-1 to 31-24 and a plurality of the cell modules 31-1 to 31-24 (FIG. 1). In the above, 24 CMUs 32-1 to 32-24, a service disconnect 33 provided between the cell module 31-12 and the cell module 31-13, a current sensor 34, and a contactor 35 are provided. The plurality of cell modules 31-1 to 31-24, the service disconnect 33, the current sensor 34, and the contactor 35 are connected in series.

  Here, in the cell modules 31-1 to 31-24, a plurality of battery cells are connected in series and in parallel to form an assembled battery. A plurality of cell modules 31-1 to 31-24 connected in series constitute an assembled battery group.

The battery board 23-1 further includes a BMU 36. The communication lines of the CMUs 32-1 to 32-24 and the output line of the current sensor 34 are connected to the BMU 36.
The BMU 36 controls the entire battery board 23-1 under the control of the gateway device 24 and uses the results of communication with each CMU 32-1 to 32-24 (voltage data and temperature data described later) and the detection results of the current sensor 34. Based on the control, the contactor 35 is controlled to open and close.

Next, the configuration of the battery terminal board will be described.
The battery terminal board 22 is configured as a plurality of board circuit breakers 41-1 to 41-N provided corresponding to the battery board units 21-1 to 21-N, and a microcomputer for controlling the entire storage battery device 11. And a master device 42.

  The master device 42 is configured as a control power supply line 51 supplied via the UPS (Uninterruptible Power System) 12A of the power conversion device 12 between the power conversion device 12 and Ethernet (registered trademark), and control data And a control communication line 52 for exchanging data.

  Here, detailed configurations of the cell modules 31-1 to 31-24, the CMUs 32-1 to 32-24, and the BMU 36 will be described.

FIG. 3 is a diagram showing the detailed configuration of the cell module, CMU and BMU.
Each of the cell modules 31-1 to 31-24 includes a plurality of (101 in FIG. 2) battery cells 61-1 to 61-10 connected in series.

  CMUs 32-1 to 32-24 measure the current and voltage of battery cells 61-1 to 61-10 constituting corresponding cell modules 31-1 to 31-24 and the current and voltage for measuring the temperature at a predetermined place. A CAN (Controller Area) for performing CAN communication between the temperature measurement IC (Analog Front End IC: AFE-IC) 62, the MPU 63 that controls the entire CMU 32-1 to 32-24, and the BMU 36. Network) A communication controller 64 conforming to the standard, and a memory 65 for storing voltage data and temperature data corresponding to a voltage for each cell.

  In the following description, the combination of cell modules 31-1 to 31-24 and corresponding CMUs 32-1 to 32-24 will be referred to as battery modules 37-1 to 37-24. . For example, a configuration in which the cell module 31-1 and the corresponding CMU 32-1 are combined is referred to as a battery module 37-1.

  The BMU 36 is also transmitted from the communication controller 72 conforming to the CAN standard for performing CAN communication between the MPU 71 for controlling the entire BMU 36 and the CMUs 32-1 to 32-24, and CMUs 32-1 to 32-24. And a memory 73 for storing voltage data and temperature data.

  The storage battery controller 5 detects the generated power of the natural energy power generation unit 1 and performs output fluctuation suppression of the generated power using the storage battery device 11 in order to reduce the influence of the generated power on the power system. Here, the fluctuation suppression amount for the storage battery device 11 is calculated by the storage battery control controller 5 or the host control device 6 thereof, and is given as a charge / discharge command to a PCS (Power Conditioning System) 12 corresponding to the storage battery device 11.

[1] First Embodiment Next, the first embodiment will be described in detail.
FIG. 4 is a main part functional block diagram of the first embodiment.
In the following description, in order to simplify the description and facilitate understanding, the description is focused on the battery module 37-1 among the battery modules 37-1 to 37-24 constituting the battery panel unit 21-1. Do.

  As shown in FIG. 4, the CMU 32-1 constituting the battery module 37-1 measures the current flowing to the individual battery cells 61-1 to 61-10 constituting the cell module 31-1. A measuring unit 81, a voltage measuring unit 82 for measuring the voltage of each of the battery cells 61-1 to 61-10 constituting the cell module 31-1, a time recording unit for recording the time of current measurement and voltage measurement It functions as 83.

  Further, the BMU 36 corresponding to the CMU 32-1 constitutes a power amount calculation unit 91 that calculates the power amount based on the current measured by the current measurement unit 81 and the voltage measured by the voltage measurement unit 82, and a cell module 31-1. It functions as an SOC calculation unit 92 that calculates the SOC when the entire battery cells 61-1 to 61-10 are regarded as one storage battery.

  In addition, storage battery control controller 5 that controls battery panel unit 21-1 via PCS 12 is a stay that records as a stay map corresponding to a frequency distribution pattern (histogram) of transition of SOC per predetermined time calculated by SOC calculation unit 92. It functions as a control value determination unit 102 that determines a control parameter (control value) for controlling the battery panel unit 21-1 based on the map recording unit 101 and the stay map.

Here, prior to the description of the operation of the first embodiment, the correspondence between the stay map and the control parameters will be described.
FIG. 5 is a function explanatory diagram of the stay map recording unit.
As shown in the left part of FIG. 5, the stay map recording unit 101 acquires SOC calculation data for each predetermined measurement timing (for example, every one minute) from the BMU 36 functioning as the SOC calculation unit 92.

In this case, since SOC calculation data includes time data corresponding to the time recorded at the time of voltage measurement by CMU 32-1 functioning as voltage measurement unit 82 and time recording unit 83, stay map recording The storage battery controller 5 functioning as the unit 101 counts the detection frequency for each SOC value range (for example, in a unit of 5% SOC) every predetermined time (for example, one hour).
Then, the storage battery controller 5 functioning as the stay map recording unit 101 generates a stay map (frequency distribution pattern) of the SOC based on the counted detection frequency.

Here, a typical SOC stay map will be described with reference to the drawings.
FIG. 6 is an explanatory diagram of a stay map of the SOC of the first pattern.
In the case of FIG. 6, when the cell module 31-1 is regarded as one storage battery, the operation is approximately equally performed between SOC = 0% and 100%.

  For example, after the cell module 31-1 is charged to the state of SOC = 100%, it is extracted when the operation is performed such that the electric power is supplied by gradually discharging to the state of SOC = 0%. It is a stay map. That is, even if the life of storage battery system 3 is somewhat reduced, it is a stay map shown in the case of performing an operation that places emphasis on the amount of usable power.

FIG. 7 is an explanatory diagram of a stay map of the SOC of the second pattern.
In the case of FIG. 7, when the cell module 31-1 is regarded as one storage battery, it is a case in which the SOC is limited between 20% and 80% and the operation is almost equally performed in that range. .

  For example, in consideration of stable long-term operation of the cell module 31-1, discharge is performed to a state of SOC = 20% while suppressing deterioration of the battery cells 61-1 to 61-10 configuring the cell module 31-1. Then, it is a stay map which is extracted when the operation is performed such that the operation of charging to the state of SOC = 80% and then discharging again to the state of SOC = 20% is repeated and the operation is always performed. That is, it is a stay map shown in the case of performing operation in consideration of long-term operation even if the amount of usable power is somewhat reduced.

FIG. 8 is an explanatory diagram of a stay map of the SOC of the third pattern.
In the case of FIG. 8, when the cell module 31-1 is regarded as one storage battery, the cell module 31-1 is operated approximately equally in the range of SOC = 0% to 50%.

  For example, when the cell module 31-1 is discharged to the state of SOC = 0%, charging is performed, but when charging to the state of SOC = 50%, discharging is performed again. It is a stay map extracted in the case. That is, it becomes a stay map shown when the operation of the discharge subject is performed.

As described above, in the first embodiment, the operation state of the power storage system is diagnosed by creating a stay map of the SOC, and the control value determination unit determines the control parameter from the result.
Next, the operation of the first embodiment will be described.
FIG. 9 is an operation processing timing chart of the first embodiment.

  First, the CMU 32-1 functions as the current measuring unit 81, and measures the current flowing to the individual battery cells 61-1 to 61-10 constituting the cell module 31-1 (step S11), and the time recording unit In cooperation with 83, current data is recorded (step S12).

Subsequently, the CMU 32-1 functions as the voltage measurement unit 82, and measures the voltage of each of the battery cells 61-1 to 61-10 configuring the cell module 31-1 (step S13), and the time recording unit The voltage data is recorded in cooperation with 83 (step S14).
Subsequently, the CMU 32-1 transmits current data and voltage data as measurement data to the BMU 36 (step S15).

  When receiving the measurement data (step S21), the BMU 36 functions as the power amount calculation unit 91, calculates the power amount based on the measurement data, and generates power amount data (step S22).

  Subsequently, the BMU 36 functions as the SOC calculation unit 92, and calculates SOC of the entire cell module 31-1 based on the measurement data to generate SOC data (step S23).

  Subsequently, the BMU 36 transmits the generated power amount data and the SOC data as calculation data to the storage battery control controller 5 at predetermined communication timing (step S24).

  When the arithmetic data is received (step S31), the storage battery controller 5 performs a stay map recording process (step S32) and a control value determination process (step S33).

FIG. 10 is a process flowchart of the storage battery controller.
More specifically, when the storage battery controller 5 receives the operation data (step S31), the storage battery controller 5 determines whether it is a predetermined initial operation period (step S41).

  In the determination of step S41, if it is a predetermined initial operation period (step S41; Yes), the storage battery control controller 5 determines the operation mode to be the high performance mode (step S45), and controls in the high performance mode. The parameters are set (step S48), and the process returns to step S31.

Here, the reason why the operation mode is determined to be the high performance mode in the high performance operation mode and the initial operation period will be described.
The high-performance mode is an operation mode in which the highest priority is given to utilizing the SOC range (SOC range) for operating the storage battery system 3, the battery capacity, and the power rate at maximum priority. SOC as long as it is within the allowable operating range of the storage battery system 3 The upper limit value and the SOC lower limit value are not provided.
Therefore, when the operation mode is determined to be the high performance mode in the initial operation period, no restriction is placed on the operation state, and the operation state of the storage battery system 3 set by the user is most reflected. This is because the operation mode is considered to be suitable for determining the operation mode appropriate for the user (or application system).

  In the determination of step S41, if it is not the predetermined initial operation period (step S41; No), that is, since the initial operation period has elapsed and has ended, the storage battery control controller 5 continues the SOC stay It is determined whether it is time to update the map (step S42).

  Here, the SOC stay map update time is a predetermined period immediately after a predetermined initial operation period has passed and since the last SOC stay map update time (for example, the user's operation status changes, such as one month or two months). Any period of time that is considered to have the possibility of

If it is determined in step S42 that it is time to update the stay map (step S42; Yes), the storage battery controller 5 creates a stay map of the SOC shown in FIG. 5 based on the received calculation data (step S42). Step S43).
Subsequently, the storage battery controller 5 determines the pattern of the SOC stay map (step S44).

  In the determination of step S44, when the pattern determination result of the created stay map of SOC is the first pattern shown in FIG. 6 (step S44; first pattern), storage battery control controller 5 sets the operation mode to high. The performance mode is determined (step S45), the control parameter is set in the high performance mode (step S48), and the process returns to step S31.

  Similarly, in the determination of step S44, when the determination result of the pattern of the created stay map is the second pattern shown in FIG. 7 (step S44; second pattern), the storage battery controller 5 operates in the operation mode. Is determined to be the long life mode (step S46), control parameters are set in the long life mode (step S48), and the process returns to step S31.

Here, the long life mode will be described.
The long life mode is an operation mode in which suppression of deterioration of the power system operating the storage battery system 3 is given the top priority and the SOC region and power rate are limited. For example, the storage battery system 3 has an SOC upper limit of 80%, SOC lower limit The SOC range that can be operated with a value of 20% is limited to SOC = 20% to SOC = 80%.

  This is because if the battery stays in the SOC state near the charge end (SOC = 100%) or the discharge end (SOC = 0%), the deterioration of the battery cells 61-1 to 61-10 is promoted. This is to prevent shortening of the operation period of the storage battery system (because the deterioration rate is fast). In this case, the SOC upper limit value and the SOC lower limit value are not limited to the above example, and can be set as appropriate.

  Similarly, in the determination of step S44, when the determination result of the pattern of the created stay map is the third pattern shown in FIG. 8 (step S44; third pattern), the storage battery controller 5 operates in the operation mode. Is determined as the high efficiency mode (step S47), control parameters are set in the high efficiency mode (step S48), and the process returns to step S31.

Here, the high efficiency mode will be described.
The high efficiency mode is an operation mode in which the control parameter is set to the optimum value according to the user's operation situation. For example, when it is found that the operation area is biased from SOC = 0% to SOC = 50% Operation at discharge end where deterioration is promoted is avoided, and SOC upper limit value is set to 75% and SOC lower limit value 25% so that the operation area width of SOC is 50% without change (in this case, A median of 50% SOC is preferred).

As described above, it is possible to easily and reliably determine the operation state of the storage battery system 3 by creating the SOC stay map.
Therefore, according to the first embodiment, the user of storage battery system 3 can select and operate the operation mode suitable for the actual operation method of storage battery system 3.

  For example, since there is no restriction on the SOC area that can be operated in the high-performance mode, the performance of the storage system can be utilized to the maximum, and in the long-life mode, control is performed to avoid charging and discharging which is an area with a high degradation rate. In the high efficiency mode, it is expected that the service life of the storage system can be extended, and in the high efficiency mode, the user's operation method is controlled so as to automatically suppress deterioration while extracting the performance of the storage system from the stay map representing the user's operation status. Control suitable for

[2] Second Embodiment FIG. 11 is a functional block diagram of essential parts of a second embodiment.
In FIG. 11, the same parts as in FIG. 4 are assigned the same reference numerals, and the detailed description thereof is used.
The second embodiment differs from the first embodiment in that a power rate calculator 93 is provided to calculate the power rate of the cell module 31-1.

Next, the operation of the second embodiment will be described.
FIG. 12 is an operation processing timing chart of the second embodiment.

  First, the CMU 32-1 operates in the same manner as in the first embodiment (steps S11 to S14), and transmits current data and voltage data as measurement data to the BMU 36 (step S15).

  When receiving the measurement data (step S21), the BMU 36 functions as the power amount calculation unit 91, calculates the power amount based on the measurement data, and generates power amount data (step S22).

  Subsequently, the BMU 36 functions as the SOC calculation unit 92, and calculates SOC of the entire cell module 31-1 based on the measurement data to generate SOC data (step S23).

Subsequently, the BMU 36 functions as the power rate calculation unit 93, calculates the power rate of the cell module 31-1 based on the measurement data, and generates power rate data (step S51).
Subsequently, the BMU 36 transmits the generated power amount data, the SOC data and the power rate data as calculation data to the storage battery controller 5 at predetermined communication timing (step S24).

  When the operation data is received (step S31), the storage battery control controller 5 performs a stay map recording process (step S32) and a control value determination process (step S33) in the same manner as in the first embodiment.

Hereinafter, the operation of the second embodiment will be described with reference to FIG. 10 again.
When the storage battery controller 5 receives the operation data (step S31), the storage battery controller 5 determines whether it is a predetermined initial operation period (step S41).

  In the determination of step S41, if it is a predetermined initial operation period (step S41; Yes), the storage battery control controller 5 determines the operation mode to be the high performance mode (step S45), and performs control in the high performance mode. The parameters are set (step S48), and the process returns to step S31.

  In the determination of step S41, if it is not the predetermined initial operation period (step S41; No), that is, since the initial operation period has elapsed and has ended, the storage battery control controller 5 continues the SOC stay It is determined whether it is time to update the map and the power rate stay map (step S42).

  Here, the update time of the stay map of the power rate is, similarly to the update time of the stay map of SOC, a predetermined period immediately after the lapse of the predetermined initial operation period and from the update time of the stay map of the previous SOC (for example, It is assumed that one month or two months, or any other period that may cause a change in the user's operation situation) has passed. Note that it is not necessary that the SOC stay map update time and the power rate update time be the same.

  If it is determined in step S42 that the stay map update time is reached (step S42; Yes), the storage battery control controller 5 determines whether the SOC stay map and SOC stay shown in FIG. 5 based on the received calculation data. A stay map of the same power rate as the map is created (step S43).

Subsequently, the storage battery controller 5 determines the patterns of the SOC stay map and the power rate stay map (step S44).
Then, the operation mode is set as in the first embodiment (steps S45 to S47), and the control parameters related to the SOC and the power rate are determined in the determined operation mode (step S48).

About the control parameter regarding SOC, it is the same as that of a 1st embodiment.
With regard to control parameters related to the power rate, specifically, in the high performance mode, the control parameters are determined such that the power rate limit value is not provided in order to give the highest priority to maximizing the performance of storage battery system 3 .
Moreover, in the long life mode, the power rate at which the storage battery system 3 can operate is limited. In the storage battery system 3, the heat generation amount increases as the power rate increases, so the temperature is high, and when the battery cells 61-1 to 61-10 are maintained in a high temperature state, the deterioration speed is fast and deterioration is promoted. It will be.

Therefore, for example, in the case of the storage battery system 3 that can be operated at the maximum power rate 5P, it may be limited to the maximum power rate 2P.
As described above, according to the second embodiment, in addition to the effects of the first embodiment, it is possible to perform control suitable for the operation method of the user of the storage system from the viewpoint of not only the SOC but also the power rate. Become.

[3] Third Embodiment FIG. 13 is a functional block diagram of relevant parts of the third embodiment.
In FIG. 13, the same parts as in FIG. 11 are given the same reference numerals, and the detailed description thereof is used.
The third embodiment is different from the second embodiment in that a temperature measurement unit 84 is provided to measure the temperatures of the individual battery cells 61-1 to 61-10.

  As shown in the second embodiment described above, for example, when the maximum power rate is limited to 2P from the power rate stay map, the individual battery cells 61-1 constituting the storage battery system 3 actually have the power rate 3P. In such a case, the power rate may be excessively limited, and as a result, the performance of the storage battery system 3 may be lowered.

  Therefore, in the third embodiment, the temperature measuring unit 84 measures the temperature of each of the battery cells 61-1 to 61-10, so that the power rate is not excessively limited.

  More specifically, using the maximum temperature during the period of creating the stay map related to the power rate, if the maximum temperature is lower than a predetermined set temperature corresponding to the boundary temperature at which the degradation rate of the storage system accelerates, Loosen the limit value and tighten the power rate limit value if it is higher than a predetermined set temperature.

  As a result, according to the third embodiment, in addition to the effects of the second embodiment, the electric power can be obtained by considering the temperatures of the individual battery cells 61-1 to 61-10 constituting the storage battery system 3. It is possible to avoid the performance degradation of the storage battery system 3 due to the rate over limitation.

[4] Fourth Embodiment FIG. 14 is a functional block diagram of essential parts of a fourth embodiment.
In FIG. 14, the same parts as in FIG. 11 are given the same reference numerals, and the detailed description thereof is used.

  The fourth embodiment is different from the second embodiment in that a current rate calculating unit 94 for calculating the current rate of the cell module 31-1 is provided instead of the power rate calculating unit 93, and a stay map of the current rate is used. It is the point which controls.

According to the fourth embodiment, in addition to the effects of the first embodiment, it is possible to perform control suitable for the operation method of the user of the storage system from the viewpoint of not only the SOC but also the current rate.
That is, as in the second embodiment described above, for example, when the maximum current rate is limited to 2X from the stay map of current rates, the individual battery cells 61-1 constituting the storage battery system 3 actually have the current rate 3X. In such a case, the current rate may be excessively limited, and as a result, the performance of the storage battery system 3 may be lowered.

Therefore, in the fourth embodiment, the current rate calculating unit 94 measures the current rates of the individual battery cells 61-1 to 61-10 so that the power rate is not excessively limited.
In this case, control parameters relating to the SOC are the same as in the first embodiment.

  With regard to control parameters related to the current rate, specifically, in the high performance mode, the control parameters are determined such that the current rate limit value is not provided in order to give the highest priority to maximizing the performance of storage battery system 3 .

  Moreover, in the long life mode, the current rate at which the storage battery system 3 can operate is limited. In the storage battery system 3, the heat generation amount increases as the current rate increases, and thus the temperature is high, and when the battery cells 61-1 to 61-10 are maintained in a high temperature state, the deterioration speed is fast and deterioration is accelerated. It will be.

Therefore, for example, in the case of the storage battery system 3 that can be operated at the maximum current rate 5X, it may be limited to the maximum current rate 2X.
As described above, according to the fourth embodiment, in addition to the effects of the first embodiment, it is possible to perform control suitable for the operation method of the user of the storage system from the viewpoint of not only the SOC but also the current rate. Become.

[5] Fifth Embodiment FIG. 15 is a functional block diagram of essential parts of a fifth embodiment.
In FIG. 15, the same parts as in FIG. 14 are assigned the same reference numerals, and the detailed description thereof is used.

The fifth embodiment differs from the fourth embodiment in that a temperature measurement unit 84 is provided to measure the temperatures of the individual battery cells 61-1 to 61-10.
As a result, according to the fifth embodiment, in addition to the effects of the fourth embodiment, the electric power can be obtained by considering the temperatures of the individual battery cells 61-1 to 61-10 constituting the storage battery system 3. It is possible to avoid the performance degradation of the storage battery system 3 due to the rate over limitation.

  As described above, according to the storage battery device to which the embodiment is applied, it is possible to present or automatically control the operation mode appropriate for the user (or application system).

  The storage battery controller 5 of the storage battery system of the present embodiment includes a control device such as a CPU, a storage device such as a ROM (Read Only Memory) or a RAM, an external storage device such as an HDD or a CD drive device, and a display device. It has a display device and an input device such as a keyboard and a mouse, and has a hardware configuration using a normal computer.

  The program executed by the storage battery controller 5 of the storage battery system of the present embodiment is a file of an installable format or an executable format, and is a CD-ROM, a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disk) And the like, and is provided by being recorded on a computer readable recording medium.

Further, the program executed by the storage battery control controller 5 of the storage battery system of the present embodiment may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. . Furthermore, the program executed by the storage battery management apparatus of the present embodiment may be provided or distributed via a network such as the Internet.
Further, the program of the storage battery control controller 5 of the storage battery system of the present embodiment may be configured to be provided by being incorporated in advance in a ROM or the like.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention.

  For example, a mode may be employed in which a part or all of the processing performed by a middle control apparatus such as the BMU 36 in each embodiment is performed by the storage battery control controller 5 or a higher control apparatus (not shown).

  For example, part or all of the processing performed by a middle control apparatus such as the BMU 36 in each embodiment may be performed by a CMU or the like which is a lower control apparatus.

  For example, some or all of the processing performed by lower-level devices such as CMUs may be performed by a middle-level control device such as a BMU, the storage battery control controller 5 or a higher-level control device (not shown).

For example, part or all of the processing performed by the higher-level control device such as the storage battery control controller 5 may be performed by a middle-level control device such as a BMU or a lower-level control device such as a CMU.
These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  For example, in the above description, the storage battery control controller 5 performs the functions of the stay map recording unit 101 and the control value determination unit 102. However, the host control device 6 or the PCS 12 performs the functions, or It is also possible to arrange.

Claims (8)

A storage unit which stores in advance a correspondence between a SOC distribution pattern and a control parameter of the storage battery device during operation of the storage battery device defined by the SOC lower limit value and the SOC upper limit value ;
Defined by the frequency of the frequency distribution pattern of the SOC to determine the distribution, the SOC upper limit value and the SOC lower limit value by referring to the storage unit of the predetermined period of SOC of the measured accumulator devices at predetermined time intervals during the operation A determination unit that determines a control parameter of the storage battery device to limit the SOC of the storage battery device within the SOC region to be selected ;
Storage battery system. The frequency distribution is obtained by dividing and counting a predetermined SOC range as a class with respect to the SOC of the storage battery device measured at predetermined time intervals.
The storage battery system according to claim 1. The frequency distribution is updated every predetermined update period,
The storage battery system according to claim 1 or 2. The storage battery device comprises at least a plurality of battery cells connected in series,
A current measurement unit that measures the current flowing through the battery cell;
A voltage measurement unit that measures the voltage of the battery cell;
An SOC calculation unit that acquires the current flowing through the battery cell and the voltage of the battery cell as battery information together with measurement time, and calculates the SOC of the storage battery device based on the acquired battery information;
The storage battery system according to any one of claims 1 to 3, comprising: The storage unit stores in advance the correspondence between the frequency distribution pattern of the current rate of the storage battery device and the control parameter of the storage battery device,
The determination unit determines a frequency distribution pattern of the current rate for a frequency distribution of a predetermined period of the current rate of the storage battery device measured at predetermined time intervals during operation of the storage battery system, and refers to the storage unit to determine the frequency distribution pattern. Determine the control parameters of the device,
The storage battery system according to any one of claims 1 to 4. The storage battery device comprises at least a plurality of battery cells connected in series,
A temperature measurement unit that measures the temperature of each battery cell;
The determination unit determines control parameters of the storage battery device based on the temperature.
The storage battery system according to any one of claims 1 to 5. A method performed by the battery device,
Storing in advance a correspondence between a SOC distribution pattern and a control parameter of the storage battery device during operation of the storage battery device defined by the SOC lower limit value and the SOC upper limit value ;
The frequency distribution pattern of the SOC is determined for the frequency distribution of the predetermined period of the SOC of the storage battery device measured at predetermined time intervals during the operation, and the SOC lower limit value and the SOC upper limit value are referenced with reference to the stored correspondence. Determining a control parameter of the storage battery device to limit the SOC of the storage battery device within an SOC range defined by
How to have it. A correspondence relationship between a storage battery device having at least a plurality of battery cells connected in series and an SOC frequency distribution pattern during operation of the storage battery device defined by the SOC lower limit value and the SOC upper limit value and control parameters of the storage battery device A program for controlling a storage battery system, which has a storage unit for storing in advance and performs charge / discharge control of the storage battery device, by a computer,
The computer,
Defined by the frequency of the frequency distribution pattern of the SOC to determine the distribution, the SOC upper limit value and the SOC lower limit value by referring to the storage unit of the predetermined period of SOC of the measured accumulator devices at predetermined time intervals during the operation Means for determining control parameters of the storage battery device to limit the SOC of the storage battery device within the SOC region to be selected ;
To make it work.

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