JP2016092996A - Storage battery control device and storage battery control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of cells of a secondary battery to be mounted, on assumption that operation is ensured for an apparatus to be operated in a short time consuming much power.SOLUTION: Before start of discharge control, the number of cells of a secondary battery is calculated from the maximum consumption power of a load 14, for example, a discharge termination voltage set during design or the like. On assumption that the operation of an apparatus is ensured, a secondary battery smaller in the number of cells than the calculated number of cells is mounted in a storage battery control device 10. The discharge control part 13 exerts control such that if the voltage of each cell measured by a voltage measuring unit 12 is determined to be equal to or higher than the set second discharge termination voltage, discharge is permitted and if it is lower than the second discharge termination voltage, discharge is stopped.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a storage battery control device and a storage battery control method.

One cause of deterioration of the secondary battery is deterioration of the positive electrode or the negative electrode due to overdischarge.
In order to prevent this deterioration, a secondary battery has a discharge end voltage, and a storage battery control device is known that controls discharge to stop when the voltage of the secondary battery becomes less than the discharge end voltage. .

As an example of such a storage battery control device, there is a storage battery control device that adjusts the discharge end voltage in consideration of the influence of the environmental temperature on the voltage at which deterioration due to overdischarge occurs (that is, the discharge end voltage) (Patent Literature). 1).
This storage battery control device is intended to improve the energy utilization efficiency by adjusting the discharge end voltage, and is planned to be mounted on a high-load device having a high capacity and a long operation time.

However, in this storage battery control device, when a secondary battery is mounted, no consideration is given to reducing (adjusting) the number of cells of the secondary battery. Therefore, when a secondary battery is installed in a device that has a large maximum power consumption but only needs to operate for a short time, it is calculated from the maximum power consumption and the maximum discharge power of the secondary battery in order to correspond to the maximum power consumption of the device. It is necessary to install secondary batteries with the same number of cells.
In this case, although the operation of the device can be guaranteed, the storage capacity is mounted more than necessary, and the number of cells of the secondary battery becomes excessive (that is, the cost, size, weight, etc. of the secondary battery are large). There is a problem that.

  The present invention has been made in view of the above-described conventional problems, and its purpose is to mount a battery controller while ensuring its operation in a device that consumes a large amount of power and is scheduled to operate for a short time. It is to reduce the number of cells of the secondary battery.

  The present invention is a storage battery control device for controlling discharge of a secondary battery having a secondary battery composed of a single cell or a plurality of cells and a voltage measuring means for measuring a terminal voltage of the secondary battery. A storage means for storing a discharge end voltage higher than a first discharge end voltage preset in a secondary battery, and a terminal voltage of the secondary battery measured by the voltage measuring means are stored in the storage means. It is related with the storage battery control apparatus which has a discharge control means which controls so that discharge from the said secondary battery is permitted when it is more than the discharge end voltage higher than a said 1st discharge end voltage.

  According to the present invention, in a storage battery control device, the number of cells of a secondary battery to be mounted can be reduced while guaranteeing the operation of a device that consumes a large amount of power and is scheduled to operate for a short time.

It is a figure which shows the discharge characteristic of a secondary battery. It is a figure which shows the number of mounting cells of the secondary battery in an apparatus. It is a figure explaining the discharge final voltage, the electrical storage capacity of a unit cell, and output power. It is a figure explaining discharge final voltage and output electric power, the number of mounting cells, and electrical storage capacity. It is a functional block diagram of a storage battery control device according to an embodiment of the present invention. It is a flowchart which shows the process sequence of the discharge control of the storage battery control apparatus which concerns on embodiment of this invention. It is a functional block diagram of the storage battery control apparatus which concerns on Embodiment 2 of this invention. It is a flowchart which shows the process sequence of the discharge control of the storage battery control apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but prior to that, the discharge end voltage is adjusted (changed) in accordance with the basic principle of the present invention, that is, the maximum power consumption of a device equipped with a secondary battery. ), The fact that the required number of cells of the secondary battery can be reduced will be described with reference to FIGS.
The end-of-discharge voltage is a threshold voltage that is set for discharging stored energy without degrading the secondary battery. For example, when the secondary battery is designed by the manufacturer of the secondary battery, etc. Etc. The number of cells is the number of secondary batteries.

FIG. 1 is a diagram illustrating discharge characteristics of the secondary battery.
In FIG. 1, the horizontal axis represents discharge capacity (Ah; ampere hour), and the vertical axis represents voltage (V; volt).
In addition, FIG. 1 has shown the discharge characteristic of the unit cell of a lithium ion secondary battery as the example. Moreover, in the lithium ion secondary battery of FIG. 1, the discharge end voltage is set to 2.5V.

The storage capacity per unit cell of a lithium ion secondary battery is the amount of power that can be discharged from full charge to the end-of-discharge voltage, and is indicated by the integrated value of the discharge characteristics in FIG.
Theoretically, it can be shown by the following equation.
∫VdAh = Wh (Formula 1)
However, since the function representing the discharge characteristics cannot be specified, an accurate value of the storage capacity cannot be obtained. Therefore, in practice, the discharge characteristics are divided into a plurality of subsections, each is approximated, the product of the discharge capacity (Ah) and voltage (V) in the subsection is obtained, and these are added together to obtain an approximate value. Ask for. Here, the calculation of the approximate value is referred to as the calculation of (Equation 1) for convenience.

When (Equation 1) is calculated for the discharge characteristics shown in FIG. 1, the storage capacity is about 9 Wh.
In addition, the maximum discharge current is defined for the secondary battery. When the maximum discharge current of the unit cell is 5 A, the output power at the discharge end voltage of 2.5 V is 12.5 (= 2.5 × 5) W. It becomes.
Hereinafter, the description regarding FIGS. 2 to 4 is based on the assumption that a secondary battery having the discharge characteristics of FIG. 1 (that is, a secondary battery having a storage capacity of 9 Wh and a power output of 12.5 W per unit cell) is mounted. To do.

FIG. 2 is a diagram showing the number of cells mounted with secondary batteries in the device.
FIG. 2 shows the maximum power consumption, the average power consumption, the operating time, and the number of cells mounted on the secondary battery in a notebook computer (Laptop Computer) and an electrophotographic image forming apparatus as devices.
In the example shown in FIG. 2, it is assumed that commercial power cannot be supplied, such as during a power failure, for both the notebook personal computer and the electrophotographic image forming apparatus.

In general, the number of cells of a secondary battery mounted on a device is determined from the average power consumption of the device (average value of power consumed during operation of the device) and the operation time.
That is, the number of cells of the secondary battery mounted on the device can be expressed as follows using the average power consumption, operating time, and storage capacity of the device.
Number of secondary battery cells ≧ (average power consumption × operation time) / unit cell storage capacity (Equation 2)

  In FIG. 2, a notebook personal computer is shown as an example of a device with low power consumption and long operating time. In the case of a notebook personal computer, if the average power consumption is 10 W, the operation time is 7 hours, and the storage capacity is 9 Wh as described above, eight secondary batteries are required as the number of secondary battery mounted cells.

On the other hand, the electrophotographic image forming apparatus shown in FIG. 2 is an example of a device that consumes a large amount of power and has a short operation time.
The operating time of the electrophotographic image forming apparatus varies depending on the usage situation of the introduction destination. For example, if the required number of prints is 500 sheets and the electrophotographic image forming apparatus can print 50 sheets per minute. 10 minutes.
In this case, the number of cells of the secondary battery to be mounted on the electrophotographic image forming apparatus is 14 from (Equation 2).

However, the maximum power consumption of the electrophotographic image forming apparatus is 1500 W, which is larger than the maximum power consumption of 80 W of the notebook personal computer, and it is necessary to correspond to the maximum power consumption. That is, in order to operate the electrophotographic image forming apparatus normally, it is necessary to set the number of cells of the secondary battery as follows.
Number of cells of secondary battery ≥ maximum power consumption / (maximum output current x discharge end voltage) (Equation 3)
Here, the discharge end voltage is set, for example, at the time of designing a secondary battery as described above, and the product of the maximum output current and the discharge end voltage is the output power of the unit cell. .

The number of secondary battery cells required to guarantee the operation of the electrophotographic image forming apparatus is 120 (= 1500 (W) ÷ 12.5 (W)) from (Equation 3).
As described above, depending on the device, the maximum power consumption may need to be considered in addition to the average power consumption and the operation time in determining the number of mounted cells.

However, in this case, since the electrophotographic image forming apparatus of FIG. 2 is equipped with 120 secondary batteries to cope with the maximum power consumption, the operation of the electrophotographic image forming apparatus is guaranteed, but the power storage The capacity becomes excessive.
That is, in the electrophotographic image forming apparatus of FIG. 2, a storage capacity of about 134 Wh (= 800 W (average power consumption) × 1/6 h (operation time)) is sufficient as the storage capacity, but 120 two When the secondary battery is mounted, the total storage capacity is 1200 Wh (= 10 Wh × 120), which is excessive as the storage capacity.

FIG. 3 is a diagram for explaining the discharge end voltage, the storage capacity of the unit cell, and the output power.
The upper part of FIG. 3 shows a case where the discharge end voltage is set to 2.5 V and discharges to 2.5 V. In this case, the storage capacity of the unit cell is as described above from the discharge characteristics of the secondary battery of FIG. (Equation 1) can be used to calculate approximately 9 Wh.
The output power can also be calculated as 12.5 (= 2.5 (V) × 5 (A)) W, assuming that the maximum discharge current of the unit cell is 5 A, as described in FIG.

The lower part of FIG. 3 shows a case where the discharge end voltage is set to 3.0V and the discharge is performed to 3.0V. In this case, the storage capacity of the unit cell is expressed by (Equation 1 ) To calculate approximately 7.5 Wh. In this case, if the maximum discharge current of the unit cell is 5 A, the output power is 15 (= 3 (V) × 5 (A)) W.
Thus, the output power in the unit cell can be adjusted by changing the discharge end voltage.

FIG. 4 is a diagram for explaining the discharge end voltage and output power, the number of mounted cells, and the storage capacity.
In FIG. 4, the number of mounted cells and the storage capacity are shown corresponding to the maximum power consumption of 1500 W (ie, the number of mounted cells and the storage capacity when the output power is 1500 W). . The storage capacity indicates the storage capacity of the entire cell (that is, the storage capacity of the unit cell × the number of cells).

In the upper part of FIG. 4, the discharge end voltage is set to 2.5 V. Therefore, if the maximum discharge current of the unit cell is 5 A, the number of mounted cells is 120 (= 1500 ÷ (2.5 × 5)). The storage capacity is 1080 (= 120 × 9) Wh because the storage capacity of the unit cell is 9 Wh (FIG. 3).
In the lower part of FIG. 4, since the discharge end voltage is set to 3.0 V, when the maximum discharge current of the unit cell is 5 A, the number of mounted cells is 100 (= 1500 ÷ (3 × 5)), The storage capacity is 750 (= 100 × 7.5) Wh because the storage capacity of the unit cell is 7.5 Wh (FIG. 3).

As described above, as shown in FIGS. 1 to 4, the number of cells mounted in the secondary battery can be reduced by setting the discharge end voltage high on the premise that the maximum power consumption is supported.
Conversely, the discharge end voltage can be selected from the number of cells to be mounted and the output power necessary for guaranteeing the operation (that is, the power necessary for the device can be output).

The basic principle of the present invention has been described above. Next, an embodiment of the present invention based on this basic principle will be described.
FIG. 5 is a functional block diagram of the storage battery control device according to the embodiment of the present invention.
The storage battery control device 10 includes a battery unit 11, a voltage measurement unit 12, a discharge control unit 13, a load 14, and a memory 15.

The battery unit 11 is configured by connecting a plurality of unit cells (that is, secondary batteries) 11a in series and parallel. In this case, the plurality of unit cells 11a may be configured only in series connection or only in parallel connection.
The output of the battery unit 11 is supplied to the load 14.
In addition, in the unit cell (that is, secondary battery) 11a constituting the battery unit 11, a discharge end voltage corresponding to 2.5 V in FIG. 1 is set at the time of design, for example. The discharge end voltage is referred to as a first discharge end voltage.

The voltage measuring unit 12 measures the terminal voltage of each unit cell 11a constituting the battery unit 11 (that is, the potential difference from one end of the secondary battery to the other end), and the measured voltage is used as the discharge control unit. 13 to send.
The voltage measurement in the voltage measurement unit 12 is performed by an AD converter (ADC: Analog to Digital Converter) mounted in the voltage measurement unit 12.

The discharge control unit 13 includes a memory 15 that stores a discharge end voltage (referred to herein as a second discharge end voltage) calculated from the number of cells of the secondary battery to be mounted and the maximum power consumption of the load 14.
The discharge control unit 13 performs control so that discharge is permitted when the voltage of each unit cell 11a is equal to or higher than the second discharge end voltage, and is stopped when the voltage is lower than the second discharge end voltage.

Here, the second discharge end voltage is obtained by substituting the maximum power consumption of the load 14, the maximum output current of the unit cell 11a, and the number of cells of the secondary battery mounted in the storage battery control device 10 into (Expression 3), By changing, it can be shown as follows.
Second discharge end voltage = maximum power consumption / (maximum output current × number of secondary battery cells) (Equation 4)

In the present invention, the purpose is to reduce the number of cells of the secondary battery mounted on the storage battery control device 10, and if the number of cells of the secondary battery mounted on the storage battery control device 10 is set to be small, the second discharge The end voltage increases.
However, the second discharge end voltage is
"Maximum voltage of unit cell> second discharge end voltage> first discharge end voltage"
Must be set to satisfy In this case, it is also necessary to secure a storage capacity that ensures the operation of the device.

Allowing or stopping discharge in the discharge control unit 13 can be controlled by mounting a switch (for example, a transistor or a relay) that opens and closes the discharge path in the discharge control unit 13.
In addition, the discharge control unit 13 includes a signal for stopping the operation of the load 14 and can also stop the discharge by stopping the operation of the load 14.

The load 14 is a device that consumes a large amount of power and is scheduled to operate for a short time (that is, a device to be operated), such as the electrophotographic image forming apparatus illustrated in FIG.
The memory 15 is a nonvolatile memory.
The designer of the storage battery control device 10 uses (Equation 3) to calculate the number of cells of the secondary battery from the maximum power consumption, the maximum output current, and the first discharge end voltage of the load 14, and the calculated secondary battery The number of cells smaller than the number of cells is set. Furthermore, the designer of the storage battery control device 10 stores the second discharge end voltage calculated from the set number of cells using (Equation 4) in the memory 15.

  As described above, the second discharge end voltage is mounted on the equipment by selecting so as to satisfy the above condition (maximum voltage of unit cell> second discharge end voltage ≧ first discharge end voltage). For example, the number of cells of the secondary battery is smaller than the number of cells (formula 3) calculated from the discharge end voltage (that is, the first discharge end voltage) set at the time of design or the like and the maximum power consumption of the load 14 You can set the number to operate the device.

  A plurality of unit cells (that is, secondary batteries) 11a configured in the battery unit 11 are connected in series or in series (in this case, a predetermined number of secondary batteries 11a are connected in series, and further, they are connected in parallel. When the voltage measuring unit 12 is configured with a voltage in series connection units (that is, when a predetermined number of secondary batteries 11a are connected in series, from one end of the series connection to the other. It is also possible to measure the potential difference to the end) and the voltage of each unit cell 11 a and transmit each measured voltage to the discharge control unit 13.

In this case, the discharge control unit 13 sets a third discharge end voltage calculated from the following mathematical formula (Formula 5), and the voltage of the series connection unit measured by the voltage measurement unit 12 is the third discharge end voltage. It is also possible to perform control so as to permit discharge in the above case and stop discharge when it is lower than the third discharge end voltage.
Third discharge end voltage = maximum power consumption / (maximum output current × number of series connection units) (Equation 5)
In addition, (Formula 5) is a numerical formula shown by modifying (Formula 3).

This third discharge end voltage is taken into consideration in the manufacturing or deterioration of the secondary battery, and is the highest voltage among the unit cells (that is, the secondary battery) 11a constituting the battery unit 11. Even when the low unit cell 11a is less than the second discharge end voltage calculated using (Equation 4), the voltage of the series connection unit having the unit cell 11a as one of the components is the third voltage. In the case of the discharge end voltage or higher, it is set to control so as not to stop the discharge.
For this reason, it is possible to effectively utilize the storage capacity of each unit cell 11a after reducing the number of cells from the number of cells of the secondary battery set based on the first discharge end voltage.

  Actually, as a technique for correcting variation in cell voltage during discharge and effectively using the storage capacity, an active balance technique for charging a cell having a high voltage to a cell having a low voltage is known. By setting the voltage and controlling the discharge, it is possible to effectively use the storage capacity without providing a complicated circuit configuration of active balance.

  Note that the discharge control unit 13 determines that the voltage of any one unit cell 11a among the unit cells 11a is the first discharge even when the voltage of the series connection unit is equal to or higher than the third discharge end voltage. When the voltage is lower than the end voltage, control is performed to stop discharging in order to prevent the secondary battery from deteriorating.

FIG. 6 is a flowchart showing a processing procedure of discharge control of the storage battery control device 10 according to the embodiment of the present invention.
Before starting the discharge control, the designer of the storage battery control device 10 calculates the number of cells of the secondary battery from the maximum power consumption of the load 14, the maximum output current, and the first discharge end voltage, and the operation of the device is guaranteed. Assuming that the number of cells is set, the number of cells smaller than the calculated number of cells is set.
And the secondary battery of the set cell number is mounted in the storage battery control apparatus 10, and storage battery control is carried out from the set cell number using the above-mentioned (Formula 4) and the 2nd discharge end voltage. It memorize | stores in the memory 15 of the apparatus 10 (S101).
The process in step S101 is a process executed in the design process (manufacturing process).

When receiving the discharge control start command, the discharge control unit 13 starts the discharge control (S102).
At this time, since the electric power is discharged (supplied) to the device (that is, the load 14), the device is in an operating state.

When the discharge control is started (S102), the voltage measuring unit 12 measures the voltage of each cell (S103).
The voltage of each cell measured by the voltage measuring unit 12 is transmitted to the discharge control unit 13.

The discharge control unit 13 determines whether or not the voltage of each cell transmitted from the voltage measurement unit 12 is equal to or higher than the second discharge end voltage stored in the memory 15 in step S101 (S104).
And when it determines with the voltage of each cell being more than 2nd discharge end voltage (S104 Yes), the discharge control part 13 is controlled to continue discharge (namely, permit) (S105).
In addition, if discharge is continued by the discharge control part 13 (S105), the storage battery control apparatus 10 will perform the process regarding discharge control again from the process of step S103.

Moreover, if the discharge control part 13 determines with one cell among the cells (namely, secondary battery) which comprises the battery part 11 being less than the 2nd discharge final voltage (S104 No), it will stop discharge. Control is performed (S106).
In this case, the storage battery control device 10 ends the discharge control.

FIG. 7 is a functional block diagram of the storage battery control device 20 according to Embodiment 2 of the present invention.
The storage battery control device 20 includes a battery unit 21, a cell control unit 22, a discharge control unit 23, a load 24, a memory 25, and an operation unit 26.
In the second embodiment, unlike the first embodiment, the number of cells of the secondary battery constituting the battery unit 21 can be changed (adjusted).

As in the first embodiment, the battery unit 21 is configured by connecting a plurality of unit cells (that is, secondary batteries) 21a in series and parallel. In this case, a plurality of unit cells may be configured only in series connection or only in parallel connection.
The output of the battery unit 21 is supplied to the load 24.

The cell control unit 22 measures the voltage of each unit cell 21 a constituting the battery unit 21 and transmits the measured voltage to the discharge control unit 23, and the number of cells constituting the battery unit 21 is also determined by the discharge control unit 23. Send to.
That is, the cell control unit 22 functions as a voltage measurement unit that measures the voltage of each unit cell 21 a and a cell number measurement unit that measures the number of cells constituting the battery unit 21.
Note that the number of cells constituting the battery unit 21 can be directly input to the discharge control unit 26 from the operation unit 26 by, for example, a designer or maintenance staff of the storage battery control device 20.

The discharge control unit 23 calculates the second discharge end voltage from the above-described (Equation 4) based on the number of cells constituting the battery unit 21 and the maximum power consumption of the load 24 transmitted from the cell control unit 22. To do.
The discharge control unit 23 stores the calculated second discharge end voltage in the memory 25.
In addition, when the number of cells constituting the battery unit 21 is reduced or expanded (that is, when the number of cells transmitted from the cell control unit 22 is changed), the discharge control unit 23 sets the second discharge end voltage. And the calculated second end-of-discharge voltage is stored in the memory 25.

The discharge control unit 23 performs control so as to permit discharge when the voltage of each unit cell 21a is equal to or higher than the second discharge end voltage, and stop discharge when it is lower than the second discharge end voltage.
The permission or stop of the discharge related to the discharge control unit 23 can be controlled by mounting a switch for opening and closing the discharge path in the discharge control unit 23 as in the first embodiment.

The load 24 is the same as that in the first embodiment.
The memory 25 stores the second discharge end voltage calculated by the discharge control unit 23.
The operation unit 26 is an interface for directly operating the storage battery control device 20 as described above.

In the second embodiment, as described above, the number of cells of the secondary battery mounted on the storage battery control device 20 can be changed (adjusted).
This is simply illustrated using the numerical values shown in FIG.
When the designer or maintenance staff of the storage battery control device 20 reduces the number of cells mounted on the storage battery control device 20 from 120 to 100, the discharge control unit 23 sets the second discharge end voltage from (Equation 4). The calculation is performed again, and the calculated second end-of-discharge voltage 3.0 V is stored in the memory 25.

And the discharge control part 23 is controlled so that discharge is permitted when the voltage of each unit cell is 3.0V or more, and discharge is stopped when it is less than 3.0V.
Thereby, although the storage capacity is reduced from 1080 Wh to 750 Wh, the number of cells used for operating the device can be reduced from 120 to 100.
In this case, since the storage capacity necessary for the operation of the device is about 134 Wh as described above, the device can be operated normally.

On the contrary, if the designer or the maintenance person in charge of the storage battery control device 20 needs to expand the number of secondary batteries installed in the storage battery control device 20, the secondary battery constituting the battery unit 21 is determined. The number of can be increased.
In this case, the storage capacity can be increased from 750 Wh to 1080 Wh by expanding the number of cells from 100 to 120 using the numerical values shown in FIG. That is, by increasing the number of cells by 20%, the storage capacity can be increased by 44%, and the storage capacity can be increased more than the increase rate of the number of cells.
In this way, an increase in capacity can be realized at a low cost.

As in the first embodiment, when the plurality of unit cells 21a configured in the battery unit 21 are connected in series or in series-parallel, the discharge control unit 23 sets the third discharge end voltage (Formula 5). Then, control is performed such that discharge is permitted when the voltage of the serial connection unit measured by the cell control unit 22 is equal to or higher than the third discharge end voltage, and is stopped when the voltage is lower than the third discharge end voltage. You can also
In this case, the cell control unit 22 also measures the number of series connection units.

FIG. 8 is a flowchart showing a processing procedure of discharge control of the storage battery control device 20 according to the second embodiment of the present invention.
When receiving the discharge control start command, the cell control unit 22 measures the number of cells constituting the battery unit 21 (S201).
The measured number of cells is transmitted from the cell control unit 22 to the discharge control unit 23.

The discharge control unit 23 calculates the second discharge end voltage from the number of cells transmitted from the cell control unit 22 and the maximum power consumption of the load 24 (S202).
The discharge controller 23 stores the calculated second discharge end voltage in the memory 25 (S203).

When the second discharge end voltage is stored in the memory 25, the discharge control unit 23 starts the discharge control (S204).
At this point, since the electric power is discharged (supplied) to the device (that is, the load 24), the device is in an operating state.

When the discharge control is started (S204), the cell control unit 22 measures the voltage of each cell (S205).
The voltage of each cell measured by the cell control unit 22 is transmitted to the discharge control unit 23.

The discharge controller 13 determines whether or not the voltage of each cell transmitted by the cell controller 22 is equal to or higher than the second discharge end voltage stored in the memory 25 in step S203 (S206).
And when it determines with the voltage of each cell being more than a 2nd discharge end voltage (S206 Yes), the discharge control part 23 is controlled to continue discharge (namely, permit) (S207).
In addition, if discharge is continued by the discharge control part 23 (S207), the storage battery control apparatus 20 will perform the process regarding discharge control again from the process of step S205.

Moreover, if the discharge control part 23 determines with one cell among the cells (namely, secondary battery) which comprises the battery part 21 being less than the 2nd discharge final voltage (S206 No), it will stop discharge. Control is performed (S208).
In this case, the storage battery control device 20 ends the discharge control.

As described above, the embodiment of the present invention has been described. According to the storage battery control device, for a device that consumes a large amount of power and is scheduled to operate for a short time, the operation of the device is ensured while the operation of the device is guaranteed. The number of cells can be reduced.
In addition, the storage capacity can be easily changed by adjusting the number of cells of the secondary battery mounted on the storage battery control device.
Furthermore, since the output power can be adjusted by changing the discharge end voltage, the output power of the same storage battery control device can be adjusted and connected to different devices, and the storage battery control device can be shared. (That is, versatility can be improved).

  DESCRIPTION OF SYMBOLS 10 ... Storage battery control apparatus, 11 ... Battery part, 12 ... Voltage measurement part, 13 ... Discharge control part, 14 ... Load, 15 ... Memory.

Japanese Patent Publication No. 2008-113545

Claims (8)

A storage battery control device for controlling discharge of a secondary battery having a secondary battery composed of one or a plurality of cells and a voltage measuring means for measuring a terminal voltage of the secondary battery,
Storage means for storing a discharge end voltage higher than a first discharge end voltage preset in the secondary battery;
When the terminal voltage of the secondary battery measured by the voltage measuring unit is equal to or higher than the discharge end voltage higher than the first discharge end voltage stored in the storage unit, the discharge from the secondary battery Discharge control means for controlling to allow
A storage battery control device. In the storage battery control device according to claim 1,
The number of cells set that the discharge end voltage higher than the first discharge end voltage is set lower than the number of cells of the secondary battery calculated from the first discharge end voltage and the maximum power consumption of the device to be operated. The storage battery control device which is the second discharge end voltage calculated based on the above. In the storage battery control device according to claim 2,
A second discharge end voltage calculating means for calculating the second discharge end voltage;
The storage battery control device in which the storage means stores the second discharge end voltage calculated by the second discharge end voltage calculation means. In the storage battery control device according to claim 3,
The storage battery control device, wherein the number of cells of the secondary battery is the number of cells measured by a cell number measuring means. In the storage battery control device according to claim 1,
When the secondary battery having the number of cells set smaller than the number of cells calculated from the first discharge final voltage and the maximum power consumption of the device to be operated is configured in series or series-parallel, the first discharge A storage battery control device, wherein a discharge end voltage higher than the end voltage is a third discharge end voltage calculated based on the number of units connected in series of the secondary batteries. In the storage battery control device according to claim 5,
A third discharge end voltage calculating means for calculating the third discharge end voltage;
The storage battery control device in which the storage means stores the third discharge end voltage calculated by the third discharge end voltage calculation means. In the storage battery control device according to claim 6,
The number of the series connection units is a storage battery control device which is the number of series connection units measured by the cell number measuring means. A storage battery control method in a storage battery control device for controlling discharge of a secondary battery composed of one or a plurality of cells,
A storage end voltage storage step of storing a discharge end voltage higher than a first discharge end voltage preset in the secondary battery in the storage means;
A voltage measuring step of measuring a terminal voltage of the secondary battery by a voltage measuring means;
When the terminal voltage of the secondary battery measured in the voltage measurement step by the discharge control means is equal to or higher than the discharge end voltage higher than the first discharge end voltage stored in the discharge end voltage storage step. A discharge control step for controlling discharge from the secondary battery; and
The storage battery control method in the storage battery control apparatus which has this.

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