WO2016162900A1

WO2016162900A1 - Storage battery management device

Info

Publication number: WO2016162900A1
Application number: PCT/JP2015/001955
Authority: WO
Inventors: 小林　美佐世
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2015-04-07
Filing date: 2015-04-07
Publication date: 2016-10-13
Also published as: JPWO2016162900A1

Abstract

Provided is a storage battery management device with which the degree of degradation of a storage battery can be accurately evaluated. The storage battery management device (10A) is provided with: an information acquisition unit (11); a counter unit (12); an evaluation unit (13); and an output unit (14). The information acquisition unit (11) acquires information about the state of charge of a storage battery (213). The counter unit (12) extracts a state in which the storage battery (213) has been charged and has reached a fully charged state, from the information about the state of charge of the storage battery (213), and counts the number of times that the state of being fully charged occurs. The evaluation unit (13) evaluates the degree of degradation of the storage battery (213) using the number of times that said state occurs, as counted by the counter unit (12). The output unit (14) outputs an evaluation result from the evaluation unit (13). The storage battery (213) is a lead storage battery to be charged with electric power generated by means of a solar panel (211).

Description

Battery management device

The present invention generally relates to a storage battery management device, and more particularly to a storage battery management device that manages deterioration of a storage battery.

Conventionally, a technique for detecting the number of overcharge arrivals at the time of charging in a configuration in which a storage battery is charged using a solar cell is known (Reference 1 [Japanese Patent Application Publication No. 2005-192282]). Document 1 proposes a technique that does not change the depth of discharge when the overcharge arrival frequency is within a predetermined range, shallows the depth of discharge when it is less than the predetermined range, and increases the depth of discharge when it exceeds the predetermined range. .

Also, an independent power supply system including a power generation device and a storage battery is known (Reference 2 [Japanese Patent Application Publication No. 2005-143217]). The independent power supply system described in Document 2 includes a solar panel (solar cell module) and a storage battery that stores a DC voltage output from the solar cell module. This independent power supply system mainly charges the storage battery from the solar cell module during the daytime, and mainly discharges the storage battery at nighttime.

Document 1 describes a technique for ensuring the life of a storage battery, but the technique described in Document 1 cannot estimate the life of a storage battery. Moreover, although the independent power supply system is described in the literature 2, the technique described in the literature 2 cannot estimate the degree of deterioration of the storage battery.

An object of the present invention is to provide a storage battery management device that makes it possible to evaluate the degree of deterioration of a storage battery.

The storage battery management device according to the embodiment of the present invention extracts an information acquisition unit that acquires information on a charge state of a storage battery, and a state in which the storage battery is charged and has reached full charge from information on the charge state of the storage battery, A counting unit that counts the number of occurrences of a state that has reached full charge, an evaluation unit that evaluates the degree of deterioration of the storage battery using the number of occurrences counted by the counting unit, and outputs an evaluation result of the evaluation unit And an output unit, wherein the storage battery is a lead storage battery that is charged using the power generated by the solar battery.

Another storage battery management apparatus according to an embodiment of the present invention selects an on state that is provided in an electrical path between an electrical load to which electric power is supplied from the storage battery and that is in an off state that blocks the electrical circuit. And a power supply facility comprising a switch configured to switch between the switch and an on state and an off state of the switch, and the storage battery is charged using the generated power of the solar cell. The information storage unit for acquiring information related to the state of charge of the storage battery, and the change in the battery voltage of the storage battery before and after switching from off to on of the switch was recorded and recorded. An evaluation unit that obtains a regression equation representing a relationship between an elapsed period from the start of use of the storage battery and the change using the change, and predicts a period until the storage battery reaches the battery life using the regression When And an outputting unit for outputting the evaluation result of the evaluation unit.

The storage battery management apparatus according to the embodiment of the present invention has an effect that the degree of deterioration of the storage battery can be accurately evaluated.

1 is a block diagram illustrating a first embodiment. It is a figure which shows the example of a characteristic of the storage battery in Embodiment 1. 6 is a diagram illustrating a display example in Embodiment 1. FIG. FIG. 6 is a block diagram illustrating a second embodiment. FIG. 6 is a block diagram illustrating a third embodiment. 10 is a diagram illustrating an operation example of Embodiment 3. FIG. FIG. 10 is a diagram illustrating an operation applied to the first, second, and third embodiments. FIG. 10 is a diagram illustrating an operation applied to the first, second, and third embodiments.

(Overview)
The storage battery management device described below has a function of determining the degree of deterioration of a storage battery. The storage battery management device is used in conjunction with power supply equipment. The power supply facility includes a power supply device, a switch, and a control unit. The power supply device includes a solar battery and a storage battery. The switch is configured to select one of an ON state that is provided in an electric circuit between the electric load supplied with electric power from the power supply device and that is in an on state that interrupts the electric circuit. The control unit has a function of switching between an on state and an off state of the switch.

The power supply unit assumes an independent power supply. The stand-alone power source means a power source that is electrically separated from an electric power system installed to supply power by an electric power company. This type of power supply device is sometimes called off-grid because it is independent of the grid that is the power system. This type of stand-alone power supply can be used even in remote areas or islands where electrification is not progressing. In addition, it can be used for the purpose of supplying power before the power system is restored in the disaster area. Note that the technology described below can be used even with a distributed power source linked to a system power source.

The power supply device uses a solar panel (that is, a solar cell) as a power generation device. The solar panel generates power mainly during the daytime and generates little power at night, so the output fluctuates in units of one day. In other words, it can be said that the generated power of the solar panel has a periodicity in units of one day. However, the solar panel's daily power generation varies due to weather even during the daytime, and varies due to differences in sunshine hours due to the season and topography.

The power supply device further includes a charging device and a power converter. The charging device outputs a direct current whose voltage is adjusted using the power generated by the solar panel. The output power of the charging device is supplied to the storage battery and the power converter. The power converter is a DC / AC converter (that is, an inverter), and converts DC power into AC power, and this AC power becomes an output of the power supply device.

The storage battery is always connected on the electric circuit connecting the charging device and the power converter. In the power supply device having this configuration, fluctuations in the output voltage of the solar panel are suppressed by the charging device, and fluctuations in power required by the electric load are suppressed by the storage battery. The charging device not only supplies the generated power of the solar panel to the storage battery, but also has a function of monitoring information for grasping the state of charge of the storage battery, such as the battery voltage of the storage battery.

In the power supply device described above, if the generated power of the solar panel is not used for charging the storage battery and exceeds the power used by the electric load, a surplus is generated in the generated power. Since the power supply device is an independent power supply, such surplus power is discarded without being used.

Suppose that the power supply unit has a capacity of about several kWh to several hundred kWh and an output of several kVA to several tens of kVA. In addition, the power supply device desirably includes a housing having a size that can be moved using an automobile or the like. The housing is box-shaped, and the size of the housing is about the same as, for example, a transport container, and the width and height are about 2 to 3 m and the length is about 3 to 15 m. Is done. If the power supply device has such a housing, simply transport the power supply device to the installation site using the same means of transportation as the container, assemble the wiring on the installation site, and then lay the wiring with the electrical load. This makes it possible to use the power supply device.

Note that the numerical values described above are numerical values as examples for explanation, and are not intended to be limiting. In the following, a configuration in which the housing of the power supply apparatus can mount the solar panel is exemplified, but it is not essential that the housing can mount the solar panel.

By the way, the power supply device described above includes a storage battery, and the maximum amount of power that can be stored decreases as the storage battery repeatedly charges and discharges. That is, it is known that the storage battery deteriorates while it is repeatedly charged and discharged. The storage battery needs to be replaced if it deteriorates, and it is important for the user to know the replacement time. For the replacement of the storage battery, one of the following times is generally selected. That is, the timing for replacing the storage battery is often based on one of the time points determined regularly, the time point determined to be the replacement time in the periodic inspection, and the time point when the user feels inconvenience in actual use.

However, if the storage battery is regularly replaced, the replacement time is often determined to have a margin, so the possibility of replacing the storage battery even though the degree of deterioration of the storage battery is low at the time of replacement. Becomes higher. That is, there is a problem that the replacement frequency of the storage battery is increased and the cost is increased. In addition, when a periodic inspection is performed to determine the replacement time, work by a person is required, and as a result, labor costs are incurred, resulting in high costs. Furthermore, when the user feels inconvenience, the replacement time is too late because the degree of deterioration of the storage battery has progressed to some extent, which is inconvenient for the user. In particular, when it takes a long time to obtain a storage battery, there is a possibility that the storage battery will deteriorate further and become unusable after the user feels inconvenience until the storage battery is actually replaced.

The storage battery management device is configured to give a guide for the user to determine the replacement time of the storage battery by evaluating the degree of deterioration of the storage battery and outputting the evaluation result while using the storage battery.

(overall structure)
Hereinafter, it demonstrates using drawing. As shown in FIG. 1, the storage battery management device 10 A is used in combination with the power supply facility 20. The power supply facility 20 includes a power supply device 21, a switch 22, and a control unit 23. The switch 22 and the control unit 23 constitute a power control device 24. The switch 22 is provided in an electric circuit between the power supply device 21 and the electric load 30 and selects one of an on state in which the electric circuit is conducted and an off state in which the electric circuit is interrupted. In the configuration example shown in FIG. 1, the power control device 24 includes the storage battery management device 10 A, but the storage battery management device 10 A can be provided separately from the power control device 24.

In the configuration example shown in FIG. 1, a plurality of electrical loads 30 are provided, and the power control device 24 includes a plurality of switches 22 corresponding to the plurality of electrical loads 30 on a one-to-one basis. However, one switch 22 may be electrically connected to a plurality of electric loads 30. Even if there is one switch 22 and one electrical load 30, the storage battery management device 10A can be used.

The power supply device 21 includes a solar panel 211, a charging device 212, a storage battery 213, and a power converter 214, and is mounted on a box-shaped housing 2 such as a container. The power supply device 21 is configured by the power supply device 21 and the power control device 24, and the housing 2 is also used for transportation and installation of the power supply facility 20.

The solar panel 211 is installed using the housing 2 or is configured to be independent. For example, the solar panel 211 can be mounted on a mount attached to the roof of the housing 2. It is also possible to support a part of the solar panel 211 with the roof of the housing 2 and support the remaining part with a column built on the ground. Alternatively, the solar panel can be placed on a stand that stands on the ground. The installation work of the solar panel 211 may be performed either before or after the power supply device 21 is transported, but is usually performed at the installation site after transport.

The storage battery 213 is assumed to be a lead storage battery. The lead-acid battery has the advantage that the relationship between the discharge amount (or remaining battery level) and the battery voltage is almost linear, the discharge amount is easy to manage, and it is relatively inexpensive and easy to obtain. have. However, in order to use a lead storage battery for a long period of time, it is necessary to manage charging and discharging so as to prevent overdischarge and charge immediately after discharging.

Further, assuming that the storage battery 213 charged to full charge is discharged and then charged to full charge is one cycle, the battery life of the storage battery 213 is the maximum value of the depth of discharge in the period of one cycle (hereinafter, maximum discharge). It is known to change with depth). The discharge depth is a value representing the ratio of the discharge amount to the rated capacity as a percentage, and when the electric energy of 80% is discharged with respect to the rated capacity of the storage battery 213, the discharge depth is 80%.

Incidentally, the number of cycles from the time when the use of the new storage battery 213 is started to the time when the storage battery 213 needs to be replaced has a relationship shown in FIG. 2 according to the maximum depth of discharge in one cycle period. In FIG. 2, characteristic a shows a case where the maximum discharge depth is 20%, characteristic b shows a case where the maximum discharge depth is 40%, and characteristic c shows a case where the maximum discharge depth is 80%.

In FIG. 2, the time when the storage battery 213 needs to be replaced is determined as the time when the maximum amount of power that can be discharged from the storage battery 213 is reduced to 80% of the rated capacity of the storage battery 213. That is, the time when the amount of power that can be discharged by the storage battery 213 decreases to 80% of the rated capacity is regarded as the battery life. According to FIG. 2, the number of cycles until the battery life is reached is 4000 cycles when the maximum discharge depth is 20%, 2000 cycles when the maximum discharge depth is 40%, and 1000 cycles when the maximum discharge depth is 80%.

FIG. 2 schematically shows the relationship between the capacity of the storage battery 213 (that is, the maximum amount of electric power that can be discharged) and the number of cycles, and although there are differences depending on the specifications of the storage battery 213, the storage battery 213 is a lead storage battery. If so, the maximum amount of electric power that can be discharged and the number of cycles have the same relationship. And the influence which the maximum discharge depth in the period of 1 cycle has on a battery life also becomes the same relationship as the example shown in FIG. 2 irrespective of the specification of lead acid battery. In addition, although the storage battery 213 is not limited to a lead storage battery, correction of the control content is needed according to the kind of the storage battery 213.

The charging device 212 is configured to stabilize the output of the solar panel 211 and output a substantially constant DC voltage. The output voltage of the charging device 212 is determined by the recommended voltage that is the specification of the storage battery 213 and the connection mode of the storage battery 213, and is selected from, for example, 12V, 24V, 48V, and the like. The charging device 212 has a function of controlling the value of the output voltage and the value of the output current by monitoring the battery voltage and the charging current of the storage battery 213.

Lead batteries are overcharged when the battery voltage rises too much. Therefore, the charging device 212 prevents overcharging of the storage battery 213 by switching between three types of charging states: a first charging state, a second charging state, and a third charging state.

In the first charging state, it is adopted in a period when the remaining battery level is low, and the charging device 212 performs charging with a relatively large charging current. When the charging proceeds in the first charging state and the battery voltage of the storage battery 213 reaches the set voltage value, the charging device 212 shifts to the second charging state.

The voltage value to be shifted to the second charging state is set so as to determine that the storage battery 213 has almost reached full charge. In the second charging state, the charging device 212 continues charging while maintaining the battery voltage at the set voltage value by intermittently flowing a charging current, and charges the storage battery 213 so as to approach full charging. continue. In the second charging state, the battery voltage of the storage battery 213 is maintained at the set voltage value, so that overcharging of the storage battery 213 can be avoided.

In the second charging state, the battery voltage is maintained at the set voltage value, and therefore the period for maintaining the second charging state is determined using time. For example, the second state of charge is maintained for about 2 to 3 hours. When the period for maintaining the second state of charge ends, the charging device 212 shifts to the third state of charge.

In the third charging state, the charging device 212 sets the output voltage to a voltage value lower than the voltage maintained in the second charging state. The third charging state is a state in which float charging is performed, and the output voltage is lowered to a voltage value set for performing floating charging. This is because the storage battery 213 is overcharged if charging is further continued in a state where the storage battery 213 is fully charged. Therefore, the voltage value set in the third charging state is set to such an extent that the overcharge of the storage battery 213 is prevented.

In the first charging state, almost all the electric power generated by the solar panel 211 is used for charging the storage battery 213. That is, the maximum power generated by the solar panel 211 is used for charging the storage battery 213 in the first charging state. However, even during the period of the first charging state, it is possible to supply power to the electric load 30 as long as the remaining battery level is equal to or greater than a predetermined lower limit value.

When the storage battery 213 is fully charged in the second state of charge, the state shifts to the third state of charge. In the third charging state, if the generated power of the solar panel 211 is greater than the power required by the electric load 30, at least a part of the power generated by the solar panel 211 is discarded as surplus power. In the third charging state, when the electric power generated by the solar panel 211 does not satisfy the electric power required by the electric load 30, the shortage electric power is supplemented from the storage battery 213.

When the storage battery 213 is discharged, the battery voltage of the storage battery 213 is lower than the set voltage in the third charging state, and when this state continues for a predetermined time, the charging device 212 performs the first charging from the third charging state. Transition to the state. Note that the charging device 212 can use not only the battery voltage of the storage battery 213 but also the charge current and discharge current value of the storage battery 213 in order to determine the timing for switching the charging state.

The charging device 212 determines that there is a surplus when the discarded power is generated among the power generated by the solar panel 211. The determination result of the charging device 212 can be taken out of the power supply device 21 as power supply information. The power supply information includes information on whether or not the solar panel 211 is generating power and the value of the battery voltage of the storage battery 213. Therefore, the charging device 212 has a function of monitoring the output of the current sensor 215 and the like appropriately arranged in the power supply device 21, and generating and outputting power supply information. In the configuration example shown in FIG. 1, the current sensor 215 is provided so as to measure the charging current and the discharging current, but the current sensor 215 is also appropriately arranged.

The power converter 214 receives DC power from the charging device 212 or the storage battery 213 and outputs AC power. The effective value of the AC voltage output from the power converter 214 is set to 100 V or 220 V, for example. The charging device 212 and the power converter 214 are basically switching power supplies.

1 includes a plurality of electrical loads 30. The configuration example shown in FIG. Electric paths for supplying power from the power supply device 21 to the respective electric loads 30 are branched into a plurality of systems. Hereinafter, an electric circuit that supplies electric power for each electric load 30 is referred to as a load electric circuit 31. The main electric circuit 32 electrically connected to the power supply device 21 branches into a plurality of load electric circuits 31. A plurality of switches 22 correspond one-to-one to each of the load electric circuits 31 of a plurality of systems, and the switches 22 are inserted for each load electric circuit 31. ON / OFF of the switch 22 is individually controlled for each switch 22. Therefore, only the electric load 30 connected to the load electric circuit 31 in which the switch 22 is on receives power from the power supply device 21.

The switch 22 is selected from, for example, an electromagnetic relay, an electromagnetic contactor, a remote control breaker, or the like. The electromagnetic relay means a switch that drives a contact using an electromagnet device including an amateur, and the electromagnetic contactor means a switch that drives a contact using an electromagnet device including an actuator that moves straight. Further, the remote control breaker means a breaker that can be remotely operated to turn on and off the contacts. The switch 22 may be configured to be able to conduct or cut off the secondary-side electric circuit according to an instruction to the primary side, and is not limited to a configuration including a mechanical contact, but a switch using a semiconductor switch It may be. The on / off state of the switch 22 is used to mean that the secondary side electric circuit is conducted or cut off in response to an on / off instruction to the primary side of the switch 22.

ON / OFF of the switch 22 is instructed from the processing unit 230 constituting the control unit 23. In FIG. 1, a solid line represents a power path, and a broken line represents an information path. The processing unit 230 determines on / off of each switch 22 using the current flowing from the power supply device 21 to the electric load 30 and the power supply information output from the power supply device 21.

The current flowing from the power supply device 21 to the electric load 30 is monitored by a current sensor 34 disposed in the main electric circuit 32. The control unit 23 includes a measurement unit 231 that obtains a current value from the output of the current sensor 34. It is desirable that the measurement unit 231 also monitors the output voltage of the power supply device 21. The power supply information is acquired by the communication unit 232 that communicates with the charging device 212. The current sensor 34 has a configuration in which a winding is wound around an annular core such as a toroidal core, a Rogowski coil that is a planar air-core coil, and a magnetically responsive element such as a Hall element or a magnetoresistive element attached to the magnetic core. It is selected from the configuration.

The control unit 23 acquires power supply information from the power supply device 21 through the communication unit 232. When the power supply device 21 shifts from the first charging state to the second charging state, in principle, all the switches 22 are turned on. To do. The relationship between the capacity of the power supply device 21 and the power consumption of the electric load 30 is determined so that all the switches 22 can be turned on.

Incidentally, the power supplied by the power supply device 21 varies. Therefore, the processing unit 230 receives the current value flowing through the electrical load 30 from the measurement unit 231 after turning on the switch 22. And the process part 230 restrict | limits the switch 22 to turn on according to a priority so that this electric current value may not exceed the capacity | capacitance of the power supply device 21. FIG.

The processing unit 230 receives power supply information from the charging device 212 through the communication unit 232, and the power supply device 21 operates in the second charging state and surplus occurs in the third charging state to generate power. Recognize the discard period. When the processing unit 230 recognizes from the power supply information that the storage battery 213 is almost fully charged, the current value notified from the measurement unit 231 is the capacity of the power supply device 21 after all the switches 22 are turned on. It is turned off in order from the switch 22 with the lowest priority so that it becomes the following. The priority order of the switch 22 is artificially determined by the location and type of the electrical load 30 and is stored in the storage unit 233 provided in the control unit 23. In short, the processing unit 230 can turn on all the switches 22 only during a period in which the storage battery 213 is nearly fully charged, and in a period in which the storage battery 213 is not fully charged, the switching corresponding to the specific electrical load 30 is performed. It is determined that only the device 22 is turned on. Note that the state in which the storage battery 213 is close to full charge is, as described above, the second charge state and a state in which surplus power is generated in the third charge state.

The control unit 23 includes, as main hardware elements, a device including a processor that operates according to a program and a device that constitutes an interface for exchanging information with other apparatuses. The device including the processor is selected from a microcomputer in which the processor is integrated with the memory, or an MPU (Micro Processing Unit) that requires the processor separately from the memory.

The program is written in ROM (Read Only Memory), but when updating the program is considered, the program is written in the EEPROM and the update program is provided through an electric communication line such as the Internet. May be. The program may be provided on a recording medium such as an optical disk that can be read by a computer. Alternatively, the program may be provided using a storage medium such as a semiconductor memory that is detachable from the computer.

(Embodiment 1)
The storage battery management device 10 A determines the timing for replacing the storage battery 213 used in the power supply facility 20 described above. In the configuration example illustrated in FIG. 1, the power supply facility 20 includes a storage battery management device 10 A. The storage battery management apparatus 10 A can share the control unit 23 of the power supply facility 20 and hardware elements. That is, the control unit 23 and the storage battery management apparatus 10A can share devices such as the processor and the interface described above. However, the storage battery management device 10 A may be provided separately from the power supply facility 20.

The storage battery management device 10A extracts a state in which the storage battery 213 has reached full charge by communicating with the charging device 212. That is, the storage battery management device 10 A includes the information acquisition unit 11 that acquires information related to the state of charge of the storage battery 213 from the charging device 212. Further, the storage battery management device 10A includes a counting unit 12 that extracts the state where the storage battery 213 has reached full charge from the information acquired by the information acquisition unit 11 and counts the number of occurrences of the state that has reached full charge. In the counting unit 12, the storage battery 213 has reached full charge when the charging device 212 has shifted from the second charging state to the third charging state, that is, when the surplus of the generated power of the solar panel 211 has been discarded. It is configured to determine the state. The counting unit 12 includes a storage unit 121 for storing the number of times that the storage battery 213 has reached full charge after the use of the storage battery 213 is started.

In the configuration described above, the number of times counted by the counting unit 12 is the number of times that the storage battery 213 has reached full charge, and thus corresponds to the number of cycles described above. Since the cycle number is an element that determines the battery life, the number of times counted by the counting unit 12 can be used as a guideline for replacing the storage battery 213.

Since the storage battery 213 is charged using the generated power of the solar panel 211, the state where the storage battery 213 reaches full charge is approximately once a day. However, depending on various conditions such as the power generation capacity of the solar panel 211, the capacity of the storage battery 213, the size of the electric load 30, and the amount of solar radiation, the state where the storage battery 213 reaches full charge may occur several times a day. It is considered that the number of days in which the event that the storage battery 213 reaches full charge in a single day occurs is relatively small, and the amount of discharge of the storage battery 213 is small when such an event occurs. Is considered small. Therefore, the counting unit 12 may limit the upper limit of the number of times counted per day to one.

By the way, as described above, the maximum discharge depth in one cycle period is also an element that determines the battery life. Therefore, it is desirable that the power supply facility 20 has a configuration that limits the maximum depth of discharge. Since the current supplied to the electric load 30 is monitored by the current sensor 215, the discharge amount of the storage battery 213 is obtained based on the current value obtained from the output of the current sensor 215. The control unit 23 of the power supply facility 20 monitors the discharge amount of the storage battery 213 after the storage battery 213 reaches full charge. When the discharge amount reaches a predetermined value, the control unit 23 controls all of the plurality of switches 22. If cut off, it is possible to limit the maximum discharge depth in one cycle period.

When the power supply facility 20 restricts the maximum depth of discharge in one cycle period as described above, the relationship between the number of cycles counted by the counting unit 12 and the maximum amount of power that can be discharged by the storage battery 213 is determined. Therefore, it becomes possible to know the battery life accurately by the number of cycles. That is, by limiting the maximum discharge depth in one cycle period, it is possible to estimate the replacement time of the storage battery 213 more accurately than in the case where the maximum discharge depth is not limited.

The storage battery management device 10 A includes an evaluation unit 13 and an output unit 14. The evaluation unit 13 evaluates the degree of deterioration of the storage battery 213 using the number of cycles counted by the counting unit 12. The evaluation unit 13 converts the number of cycles counted by the counting unit 12 into an evaluation value representing the degree of deterioration regardless of whether or not the maximum depth of discharge in one cycle period is limited. The output unit 14 outputs the evaluation result of the evaluation unit 13. In the configuration example shown in FIG. 1, the output unit 14 is configured to convert the evaluation result of the evaluation unit 13 into data that can be displayed on a display 40 such as a liquid crystal display. Therefore, the user can obtain an indication regarding the life of the storage battery 213 based on the display content of the display 40.

The evaluation unit 13 can obtain the ratio of the maximum amount of power that can be discharged by the storage battery 213 with respect to the rated capacity as an evaluation value representing the degree of deterioration. For the storage battery 213, if the evaluation unit 13 stores the relationship between the number of cycles as shown in FIG. 2 and the maximum amount of power that can be discharged in the storage unit 131, this ratio is the number of cycles counted by the counting unit 12. It can be easily obtained from

By the way, in the configuration described above, since the user can know the degree of deterioration of the storage battery 213, the replacement time of the storage battery 213 can be predicted. However, the replacement time of the storage battery 213 estimated from the degree of deterioration of the storage battery 213 varies depending on the user. The storage battery management device 10A shown in FIG. 1 includes a clock unit 15 that measures the elapsed time from the start of use of the storage battery 213, and the evaluation unit 13 evaluates the replacement time of the storage battery 213 by converting the degree of deterioration into time. It can be obtained as a value.

In this case, the evaluation unit 13 stores the standard value for the number of cycles from the start of use of the new storage battery 213 to the replacement time, and the elapsed time from the start of use of the storage battery 213 measured by the clock unit 15 in the storage unit 131. . When the ratio of the number of cycles counted by the counting unit 12 to the standard value of the number of cycles stored in the storage unit 131 is obtained and the reciprocal of this ratio is multiplied by the elapsed time stored in the storage unit 131, the use of the storage battery 213 The time from the start to the battery life can be predicted. Then, by subtracting the elapsed time stored in the storage unit 131 from the predicted time, the remaining time until the storage battery 213 reaches the battery life can be estimated.

Here, it is assumed that the control unit 23 of the power supply facility 20 limits the maximum depth of discharge to 40% during one cycle. That is, in this example, the lower limit value of the discharge depth in one cycle period is set to 40%. Since this condition corresponds to the characteristic b in FIG. 2, the maximum number of electric power that can be discharged by the storage battery 213 is reduced to 80% of the rated capacity, and the number of cycles is 2000. That is, the number of cycles until the replacement of the storage battery 213 is recommended is 2000 cycles, and 2000 cycles is set as the standard value in the storage unit 131.

On the other hand, if the count number counted by the counting unit 12 is 1600 cycles and the elapsed time counted by the clock unit 15 is 4 years, the number of years until reaching 2000 cycles is 4 years × (2000 / 1600) = 5 years. In addition, if the elapsed time of 4 years is subtracted from the calculated time of 5 years, the remaining time until the battery life can be estimated as 1 year. In this example, in order to facilitate calculation, year is used as the unit of time, but it is desirable to use day as the unit of time.

FIG. 3 shows an example in which the value obtained by the evaluation unit 13 as described above is displayed on the display 40. In the display example of FIG. 3, the period from the start of use of the storage battery 213 (that is, the operation period) is indicated as 4 years, and the period until the replacement time of the storage battery 213 is indicated as 1 year. Thus, when the standard of the replacement time of the storage battery 213 is shown, the user can prepare the replacement storage battery 213 in consideration of the period from when the replacement storage battery 213 is ordered until it is obtained. become.

As described above, the storage battery management device 10 A of the present embodiment includes the information acquisition unit 11, the counting unit 12, the evaluation unit 13, and the output unit 14. The information acquisition unit 11 acquires information regarding the state of charge of the storage battery 213. The counting unit 12 extracts the state in which the storage battery 213 is charged and has reached full charge from the information regarding the charge state of the storage battery 213, and counts the number of occurrences of the state in which full storage has been reached. The evaluation unit 13 evaluates the degree of deterioration of the storage battery 213 using the number of occurrences counted by the counting unit 12. The output unit 14 outputs the evaluation result of the evaluation unit 13.

According to this configuration, it is possible to obtain an indication of the degree of deterioration of the storage battery 213 by acquiring information related to the state of charge of the storage battery 213. That is, the user can estimate the replacement time of the storage battery 213 based on the number of occurrences of the state in which the storage battery 213 has reached full charge.

In particular, when the storage battery 213 is a lead storage battery that is charged using the generated power of the solar battery (solar panel 211), the battery life becomes longer when the state close to full charge is maintained. It is effective to use the number of occurrences as a measure of the degree of deterioration.

In this configuration, it is desirable that the generated power of the solar cell (solar panel 211) is charged to the storage battery 213 through the charging device 212. In this case, the information acquisition unit 11 is configured to acquire information related to the state of charge of the storage battery 213 from the charging device 212. In addition, the counting unit 12 may be configured to determine that a state in which surplus power not used for charging the storage battery 213 is generated in the generated power of the solar battery (solar panel 211) has reached full charge. desirable.

According to this configuration, when the information acquisition unit 11 receives information about the operation when the charging device 212 charges the storage battery 213 from the charging device 212, the counting unit 12 determines whether or not the storage battery 213 has reached full charge. It becomes possible to judge.

The storage battery management device 10 A preferably includes a clock unit 15 that measures the elapsed time from the start of use of the storage battery 213. In this case, the evaluation unit 13 estimates the remaining time until the replacement time using the evaluated degree of deterioration of the storage battery 213 and the elapsed time measured by the clock unit 15. The output unit 14 preferably outputs the remaining time until the replacement time as the evaluation result of the evaluation unit 13.

According to this configuration, since the time until the replacement time of the storage battery 213 is estimated, it is easy to determine the timing for preparing the replacement storage battery 213.

(Embodiment 2)
In the first embodiment, the lower limit value of the discharge depth in one cycle period is determined, and the evaluation unit 13 evaluates the degree of deterioration assuming that the discharge depth has reached the lower limit value in one cycle period. That is, when the lower limit value of the depth of discharge is set to 40%, the evaluation unit 13 uniformly applies the rate at which the amount of power that can be discharged when the maximum depth of discharge is 40% is reduced to the extent of deterioration. Is evaluated. In the example shown in FIG. 2, the amount of power that can be discharged in 2000 cycles is reduced by 20%, so the degree of deterioration is −20% / 2000 = −0.01%.

On the other hand, in actual use, the maximum discharge depth in one cycle period varies from day to day. Below, the structural example which adjusted the grade of deterioration according to the fluctuation | variation of the maximum discharge depth in the period of 1 cycle is demonstrated. As shown in FIG. 4, the storage battery management device 10 B of this embodiment adds a monitoring unit 16 to the storage battery management device 10 A of Embodiment 1 in order to extract the maximum depth of discharge in one cycle period. The monitoring unit 16 is configured to extract the maximum discharge depth in one cycle period using the information acquired by the information acquisition unit 11. The maximum depth of discharge in one cycle period is obtained by using the generated power of the solar panel 211 obtained from the charging device 212 and the power consumption of the electric load 30 measured by the measuring unit 231.

For example, it is assumed that the generated power amount is 1000 Wh, the consumed power amount is 2000 Wh, the conversion efficiency of the charging device 212 and the power converter 214 is 95%, and the rated capacity of the storage battery 213 is 10 kWh. In this case, the depth of discharge is obtained by the calculation of (2000 / 0.95-1000) /10000≈0.11. That is, the discharge depth is 11%.

In this configuration example, the evaluation unit 13 associates the degree of deterioration according to the maximum discharge depth in one cycle period as shown in Table 1, for example. In Table 1, the degree of deterioration is called a standard deterioration degree, and the maximum discharge depth in one cycle period is divided into 10% sections, and the standard deterioration degree is set for each section. Data as shown in Table 1 is stored in the storage unit 131 provided in the evaluation unit 13.

表 In Table 1, when the maximum discharge depth is more than 30% and less than 40%, the standard deterioration degree is -0.01%. That is, the degree of deterioration is set so as to correspond to the above-described configuration example in which the maximum discharge depth in one cycle period is uniformly assumed to be 40%. If the maximum depth of discharge in one cycle period is 30% or less, the degree of deterioration becomes smaller. Therefore, in Table 1, the standard deterioration degree is smaller than −0.01% in the section where the maximum depth of discharge is 30% or less. Set to value.

If the maximum discharge depth in one cycle period is known, the standard deterioration degree corresponding to the maximum discharge depth is obtained, and the degree of deterioration from the start of use of the storage battery 213 is evaluated by accumulating the standard deterioration degree obtained for each cycle. It becomes possible to do.

For example, if the degree of deterioration in a state where full charge is reached one cycle before is −1.00 and the maximum discharge depth in this cycle is 11%, the standard deterioration degree is −0.005. Therefore, the cumulative value of the standard deterioration degree is −1.005%. That is, the amount of power that can be discharged by the storage battery 213 is 98.995% (= 100% -1.005%) with respect to the rated capacity.

In the storage battery management device 10B of the present embodiment, the evaluation unit 13 receives the maximum discharge depth for one cycle period from the monitoring unit 16 every time the counting unit 12 counts one cycle. The evaluation unit 13 extracts the standard deterioration degree by comparing the maximum discharge depth with the data stored in the storage unit 131. Furthermore, the evaluation unit 13 obtains the degree of deterioration from the start of use of the storage battery 213 by adding the extracted standard deterioration degree to the cumulative value of the past standard deterioration degree stored in the storage unit 131. That is, the evaluation unit 13 obtains a value for evaluating the degree of deterioration by accumulating the standard deterioration degree from the start of use of the storage battery 213. The degree of deterioration obtained by the evaluation unit 13 is output through the output unit 14 and displayed on the display 40, for example.

In the configuration example described above, assuming that the relationship between the degree of deterioration of the storage battery 213 and the cycle is linear, the standard deterioration degree with respect to the maximum discharge depth in one cycle period is set for addition. On the other hand, assuming that the relationship between the degree of deterioration of the storage battery 213 and the cycle is non-linear, the standard deterioration degree with respect to the maximum discharge depth in one cycle period can be set for multiplication.

The storage battery management device 10B of the present embodiment described above uses the information related to the state of charge of the storage battery 213, and the maximum discharge depth of the storage battery 213 in the period from when the storage battery 213 reaches full charge until it reaches full charge next time. Is provided. The evaluation unit 13 is configured to associate a standard deterioration degree indicating a degree of deterioration of the storage battery 213 in a period from when the storage battery 213 reaches full charge until it reaches full charge next to the maximum discharge depth. . The evaluation unit 13 evaluates the degree of deterioration from the start of use of the storage battery 213 by accumulating the standard deterioration degree corresponding to the maximum discharge depth every time the counting unit 12 counts the number of occurrences.

According to this configuration, it is possible to finely evaluate the degree of deterioration of the storage battery 213 as compared with the case where the degree of deterioration of the storage battery 213 per cycle is uniformly determined regardless of the maximum discharge depth. As a result, the estimation accuracy of the replacement time of the storage battery 213 is increased, and the replacement frequency of the storage battery 213 is reduced.

By the way, the standard deterioration degree is set on the assumption that the period of one cycle corresponds to almost one day. However, if the amount of solar radiation per day varies depending on the weather or season, there is a possibility that the period of one cycle does not correspond to one day, and the state where the storage battery 213 does not reach full charge continues for a long period of time. Since the lead storage battery deteriorates when it is continuously used in a state where it is not fully charged, it is necessary to correct the degree of deterioration of the storage battery 213 when the period of one cycle is long.

Therefore, the clock unit 15 is configured to count the duration of the state in which the storage battery 213 is not fully charged, and the evaluation unit 13 determines the degree of deterioration of the storage battery 213 according to the duration of time counted by the clock unit 15. Is configured to correct. The evaluation unit 13 stores, in the storage unit 131, data as shown in Table 2 in which the duration of the state where the storage battery 213 is not fully charged and the degree of correction deterioration according to the duration are associated with each other.

In Table 2, the corrected deterioration degree is determined so as to correct the degree of deterioration of the storage battery 213 when the duration of the state in which the storage battery 213 does not reach full charge is 7 days or more. That is, when an event occurs in which the storage battery 213 does not reach a full charge for seven consecutive days or more, the deterioration of the storage battery 213 proceeds. Therefore, a correction deterioration degree for correcting the degree of deterioration due to this event is determined.

The clock unit 15 uses the information acquired by the information acquisition unit 11 to measure the duration of the state where the storage battery 213 is not fully charged. That is, when the storage battery 213 shifts to a state where the storage battery 213 is not fully charged after the storage battery 213 reaches full charge, the clock unit 15 measures the duration of the state where the storage battery 213 is not fully charged. On the other hand, when the duration time counted by the clock unit 15 reaches 7 days, the evaluation unit 13 extracts the correction deterioration degree from the storage unit 131 and corrects the degree of deterioration stored in the storage unit 131.

For example, when the storage battery 213 reaches full charge, the amount of power that can be discharged by the storage battery 213 is 99.995% of the rated capacity. Thereafter, when the state in which the storage battery 213 is not fully charged continues for 7 days, the evaluation unit 13 extracts −0.01%, which is the corrected deterioration degree, from the storage unit 131, and the rated capacity of the electric energy that can be discharged by the storage battery 213 Is corrected to 98.985% (= 98.995% -0.01%). Further, when the duration of the state in which the storage battery 213 is not fully charged is the eighth day, the evaluation unit 13 extracts −0.013%, which is the corrected deterioration degree on the eighth day, from the storage unit 131, and the seventh day A correction of -0.003%, which is the difference from the correction deterioration degree, is performed. That is, the ratio of the electric energy that can be discharged by the storage battery 213 to the rated capacity is corrected to 98.982% (= 98.985% −0.003%).

As conditions for correcting the degree of deterioration of the storage battery 213, it is desirable to consider the charging conditions of the storage battery 213, the environmental temperature of the storage battery 213, etc. in addition to the duration of the state in which the storage battery 213 is not fully charged.

For example, when a large-capacity storage battery 213 is required, the storage battery 213 is composed of a plurality of cells. Therefore, while the storage battery 213 is used, the amount of charge of the cell (that is, the amount of power that can be charged), etc. Variation occurs. Therefore, the equalization charge which charges the storage battery 213 with a voltage higher than usual may be implemented. When equalization charging is performed, the amount of charge of the storage battery 213 is restored, so it is desirable to correct the degree of deterioration of the storage battery 213.

Therefore, the storage battery management device 10B includes a determination unit 17 that determines whether the storage battery 213 is charged with a predetermined voltage that is higher than usual. The predetermined voltage is a voltage when performing equalization charging, and the determination unit 17 determines whether equalization charging has been performed based on information acquired from the charging device 212. When the determination unit 17 determines that equalization charging is to be performed, the evaluation unit 13 corrects the degree of deterioration of the storage battery 213 held in the storage unit 131 by the charge recovery degree. The charge recovery degree is set so as to correct the degree of deterioration so as to extend the life of the storage battery 213 when the charge amount of the storage battery 213 is recovered by equalization charging, and is stored in the storage unit 131. The value of the charge recovery degree is fixedly determined for one execution of equalization charging.

For example, it is assumed that the degree of deterioration of the storage battery 213 stored in the storage unit 131 is 99.985% and the charge recovery degree is set to 0.01%. When the determination unit 17 determines that the equalization charging is performed, the evaluation unit 13 reads 0.01% that is the charge recovery degree from the storage unit 131, and is the degree of deterioration stored in the storage unit 131. % Is corrected to 99.995% (= 99.985% + 0.01%). Thus, when the charge amount of the storage battery 213 is recovered by equalization charging, correction is performed so as to raise the degree of deterioration of the storage battery 213.

Also, it is known that the environmental temperature of the storage battery 213 affects the degree of deterioration of the storage battery 213. In general, it is known that when the environmental temperature of the storage battery 213 increases, the storage battery 213 deteriorates. For example, it is assumed that the temperature is set to 20 ° C. or higher and the reference temperature is set to 25 ° C. It is known that at 20 to 25 ° C., the degree of deterioration of the lead storage battery is not affected by the environmental temperature. Therefore, the degree of deterioration may be corrected when the environmental temperature is 25 ° C. or higher.

In the storage battery management device 10B, the information acquired by the information acquisition unit 11 includes the storage battery 213 in order to evaluate the degree of deterioration in consideration of the environmental temperature of the storage battery 213. In the configuration example illustrated in FIG. 4, the charging device 212 monitors the environmental temperature of the storage battery 213 in order to monitor the charging state of the storage battery 213, and acquires the environmental temperature of the storage battery 213 from the charging device 212. When the charging device 212 does not have a function of measuring the environmental temperature of the storage battery 213, a temperature sensor that monitors the environmental temperature of the storage battery 213 can be provided separately.

When considering the environmental temperature of the storage battery 213, the evaluation unit 13 corrects the degree of deterioration of the storage battery 213 according to the environmental temperature. That is, the evaluation unit 13 stores data as shown in Table 3 in which the environmental temperature and the temperature deterioration degree are associated with each other in the storage unit 131.

The environmental temperature in Table 3 is an average value of the environmental temperature in a predetermined period, and the predetermined period is set to one week (7 days), for example. The evaluation unit 13 obtains an average value for one week for the environmental temperature of the storage battery 213 acquired by the information acquisition unit 11, and extracts the temperature deterioration degree by comparing the obtained average value with the storage unit 131. The timing for correcting the degree of degradation by applying the temperature degradation degree is the timing for obtaining the average value of the environmental temperature. For example, the evaluation unit 13 obtains the average value of the environmental temperature every midnight on Sunday, extracts the temperature deterioration degree, and corrects the degree of deterioration of the storage battery 213 stored in the storage unit 131.

As a specific example, when the average value of the environmental temperature in one week is 35 ° C., the temperature deterioration rate is −0.004% according to Table 3. If the degree of deterioration stored in the storage unit 131 at the time of obtaining the average environmental temperature is 99.985%, the degree of deterioration after correction is 99.985% (= 99.985%). -0.004%).

In the present embodiment, the technology for correcting the degree of deterioration of the storage battery 213 can be used in appropriate combination, except for the configuration in which the degree of deterioration is calculated in consideration of the maximum discharge depth. That is, the correction for the number of days in which the state that does not reach the full charge continues, the correction for the equalization charge, and the correction for the environmental temperature can be appropriately combined as necessary. It is also possible to evaluate the degree of deterioration of the storage battery 213 without making these corrections.

Other configurations and operations of the present embodiment are the same as those of the first embodiment. That is, the configuration denoted by the same reference numerals as in the first embodiment operates in the same manner as in the first embodiment.

In the above-described storage battery management device 10B of the present embodiment, the clock unit 15 is configured to measure the duration of the state where the storage battery 213 is not fully charged using the information acquired by the information acquisition unit 11. The evaluation unit 13 is configured to associate the corrected deterioration level indicating the degree of deterioration of the storage battery 213 during the continuous period in which the storage battery 213 is not fully charged with the continuous period. Further, it is desirable that the evaluation unit 13 corrects the degree of deterioration from the start of use of the storage battery 213 with the correction deterioration degree according to the duration of the state where the storage battery 213 is not fully charged.

Further, the storage battery management device 10B may further include a determination unit 17 that determines the state in which the storage battery 213 is charged with a predetermined voltage that is higher than usual using the information acquired by the information acquisition unit 11. In this case, the evaluation unit 13 determines a degree of charge recovery that represents the degree of deterioration when the storage battery 213 is charged with a predetermined voltage in preparation for the storage battery 213 being charged with a predetermined voltage that is higher than usual. . And when the determination part 17 discriminate | determines that the storage battery 213 was charged with the predetermined voltage, it is desirable for the evaluation part 13 to correct | amend the degree of deterioration from the use start of the storage battery 213 with a charge recovery degree.

Furthermore, the information acquisition unit 11 may be configured to acquire information related to the environmental temperature of the storage battery 213. In this case, the evaluation unit 13 is configured to associate a temperature deterioration degree indicating the degree of deterioration of the storage battery 213 according to the environmental temperature with a representative value of the environmental temperature of the storage battery in a predetermined unit period. The evaluation unit 13 can evaluate the degree of deterioration from the start of use of the storage battery 213 by accumulating the temperature deterioration degree according to the representative value of the environmental temperature for each unit period.

In these configurations, since the evaluation of the degree of deterioration of the storage battery 213 can be adjusted according to the conditions for using the storage battery 213, it is possible to improve the accuracy of estimating the degree of deterioration of the storage battery 213.

(Embodiment 3)
This embodiment employs a configuration in which the degree of deterioration of the storage battery 213 is evaluated based on the battery voltage of the storage battery 213. As shown in FIG. 5, the power supply facility 20 includes a switch 22 inserted in a load electric circuit 31 that supplies electric power to the electric load 30. The configuration of the storage battery management device 10C illustrated in FIG. 5 is a configuration obtained by removing the counting unit 12 from the configuration of the storage battery management device 10A illustrated in FIG. However, the operation of the evaluation unit 13 is different from that of the first embodiment.

As described in the first embodiment, when the lower limit value is set for the discharge depth of the storage battery 213, the control unit 23 turns off the switch 22 when the discharge depth of the storage battery 213 reaches the lower limit value. The power supply to 30 is stopped. After that, when the storage battery 213 is charged and the amount of power charged in the storage battery 213 is restored, the control unit 23 turns on the switch 22 and resumes power supply to the electric load 30.

The magnitude of the fluctuation of the battery voltage of the storage battery 213 at the time when the switch 22 is switched from OFF to ON is shown in FIG. 6 with respect to the number of days (or the number of cycles) from the start of use of the storage battery 213 under a predetermined condition. Changes linearly. That is, when the switch 22 is turned off and the storage battery 213 is not loaded, the battery voltage of the storage battery 213 drops when the switch 22 is turned on and the load is connected to the storage battery 213. The magnitude of this voltage represents the degree of deterioration of the storage battery 213. Such an event is considered to be caused by an increase in internal resistance of the storage battery 213 as the deterioration of the storage battery 213 progresses.

However, since the magnitude of the fluctuation of the battery voltage when the switch 22 is switched from OFF to ON varies depending on the conditions, in order to evaluate the degree of deterioration of the storage battery 213 based on the fluctuation of the battery voltage, it is necessary to Therefore, it is necessary to measure the magnitude of the battery voltage fluctuation. Therefore, in this embodiment, the switch 22 is switched from OFF to ON on the condition that the storage battery 213 is not charged or the storage battery 213 reaches full charge and surplus power is discarded. Record changes in battery voltage when In addition, if the size of the electrical load 30 changes every time the switch 22 is switched from OFF to ON, the battery voltage is affected by the size of the electrical load 30, so the change in the battery voltage changes in the storage unit 131. Is also determined by the power consumption of the electrical load 30. For example, when the power consumption of the electric load 30 satisfies a condition such as 1000 W ± 10%, the variation of the battery voltage is recorded in the storage unit 131. The timing of measuring the power consumption and the battery voltage of the electrical load 30 after the switch 22 is switched from OFF to ON is a predetermined time from ON in consideration of the voltage and current drift immediately after the switch 22 is turned on. It is set to the time when it has passed. The predetermined time is selected in the range of 30 seconds to 1 minute.

For example, when the storage battery 213 is not charged, the switch 22 is turned on from off, and the power consumption of the electric load 30 is 990 W one minute after the switch 22 is turned on. This state satisfies the condition for recording the variation of the battery voltage in the storage unit 131. Here, when the switch 22 is off, the battery voltage is 50.00V, and if the battery voltage 1 minute after the switch 22 is turned on is 49.00V, the storage unit 131 stores 1.00V is recorded as the variation.

The evaluation unit 13 of the present embodiment records the change in the battery voltage of the storage battery 213 before and after switching between off and on when the control unit 23 switches the switch 22 from off to on. . When data for a predetermined period is accumulated in the storage unit 131, the evaluation unit 13 can estimate a point in time when the battery life is reached based on the accumulated data. The accumulated data is as shown in Table 4.

Here, it is known that the change of the battery voltage fluctuation shows linearity with respect to the number of days (or the number of cycles). Accordingly, if there is data for a predetermined number of days of about several hundred days, it is possible to obtain a regression equation representing the relationship between the change in battery voltage and the number of days. FIG. 6 shows a regression line L1 corresponding to the regression equation. In the present embodiment, the evaluation unit 13 obtains a regression equation from data relating to changes in the accumulated battery voltage fluctuation. On the other hand, the battery life of the storage battery 213 can be determined by the value of the change in battery voltage. In FIG. 6, the determination value for the change in battery voltage when the storage battery 213 has a battery life is set to 1.50V.

The evaluation unit 13 obtains the scheduled replacement date P1 at which the battery voltage change amount reaches the determination value based on the regression line L1 obtained from the accumulated data. The scheduled replacement date P1 is the number of days from the start of use of the storage battery 213 to the end of the battery life. By obtaining such a scheduled replacement date P1, the user can obtain an indication of the date on which the storage battery 213 needs to be replaced.

In the present embodiment, when the switch 22 is controlled as a normal operation in the power supply facility 20, when the state of charge of the storage battery 213 and the power consumption of the electric load 30 satisfy predetermined conditions, the storage battery 213 Changes in battery voltage fluctuations are recorded. Therefore, a dedicated work for predicting the battery life is unnecessary, and data for predicting the battery life can be collected while the power supply facility 20 performs the normal operation. Moreover, since the regression line L1 is calculated | required using the data recorded on the memory | storage part 131, and the time which reaches | attains a battery life is estimated using this regression line L1, prediction accuracy becomes high, so that the accumulation amount of data increases. In addition, the regression line L1 can be corrected during the operation of the storage battery 213, and the prediction accuracy of the battery life can be increased as the usage time of the storage battery 213 becomes longer.

Other configurations and operations of the present embodiment are the same as those of the first embodiment. That is, the configuration denoted by the same reference numerals as those in the first embodiment operates in the same manner as in the first embodiment except for the evaluation unit 13.

The storage battery management device 10C of this embodiment is used in combination with the power supply facility 20. The power supply facility 20 includes a switch 22 and a control unit 23. The switch 22 is provided in an electric circuit (load electric circuit 31, main electric circuit 32) between the electric load 30 to which electric power is supplied from the storage battery 213, and has an on state and an off state that interrupts the electric circuit. It is configured to select one. The controller 23 switches the switch 22 between an on state and an off state. The storage battery 213 is a lead storage battery that is charged using the power generated by the solar battery (solar panel 211). The storage battery management device 10 C includes an information acquisition unit 11, an evaluation unit 13, and an output unit 14. The information acquisition unit 11 acquires information regarding the state of charge of the storage battery 213. The evaluation unit 13 records the change in the battery voltage of the storage battery 213 before and after the switch 22 is switched from off to on. Moreover, the evaluation part 13 calculates | requires the regression equation showing the relationship between the elapsed period from the start of use of the storage battery 213, and a change part using the recorded change part. Furthermore, the evaluation unit 13 predicts a period until the storage battery 213 reaches the battery life using the regression equation. The output unit 14 outputs the evaluation result of the evaluation unit 13.

According to this configuration, data for evaluating the degree of deterioration of the storage battery 213 while the switch 22 is turned on and off in order to supply and cut off power from the power supply facility 20 to the electric load 30. Is accumulated. Therefore, it is possible to evaluate the degree of deterioration of the storage battery 213 without performing special control.

In the present embodiment, the elapsed period from the start of use of the storage battery 213 is expressed using the number of days or the number of cycles, but may be time as long as the elapsed period can be expressed instead of the number of days or the number of cycles.

(Process when replacing storage battery)
In the first embodiment, data for evaluating the degree of deterioration of the storage battery 213 is stored in the storage unit 121 and the storage unit 131. The data stored in the storage unit 121 and the storage unit 131 includes data accumulated from the start of use of the storage battery 213, and such data is obtained from the storage unit 121 and the storage unit 131 when the storage battery 213 is replaced. It needs to be erased. Therefore, it is desirable that the storage battery management device 10 A is configured to detect the replacement of the storage battery 213 and delete the data in the storage unit 121 and the storage unit 131 when the replacement of the storage battery 213 is detected.

Here, as in the third embodiment, the change in the battery voltage of the storage battery 213 before and after the switch 22 is switched from OFF to ON is recorded in the storage unit 131, and the data recorded in the storage unit 131 is used. The replacement of the storage battery 213 is detected. As described in the third embodiment, the battery voltage fluctuation increases as the storage battery 213 deteriorates. On the other hand, when the storage battery 213 is replaced, the battery voltage fluctuation is reduced. That is, as shown in FIG. 7, when the storage battery 213 is replaced on the replacement date P2 that is close to the scheduled replacement date P1, the battery voltage fluctuation is greatly reduced immediately after that. Therefore, it is possible to estimate that the storage battery 213 has been replaced when the decrease in battery voltage fluctuation exceeds a predetermined threshold.

The evaluation unit 13 determines that the storage battery 213 has been replaced when an event that the battery voltage variation has decreased beyond a predetermined threshold is detected, and the storage unit 121 and the storage unit 131 have deteriorated the storage battery 213. Erase the data stored for That is, since the user only needs to replace the storage battery 213 and does not need to delete the data in the storage unit 121 and the storage unit 131, the user can be prevented from forgetting to delete the data.

In order to detect that the storage battery 213 has been replaced, the battery voltage of the storage battery 213 during a period when the power consumption of the electric load 30 is a predetermined value may be used. In other words, in the above-described operation, the battery voltage fluctuation when the switch 22 is switched from OFF to ON is used, but the storage battery 213 is replaced using only the battery voltage during the period when the switch 22 is ON. You may estimate that.

In this case, the timing for recording the battery voltage of the storage battery 213 is a condition that the storage battery 213 is discharged from the state where the storage battery 213 has reached full charge, and the power consumption amount at the electric load 30 reaches a predetermined amount. To. For example, the storage battery 213 starts discharging after the storage battery 213 reaches full charge, and the battery voltage at the time when the power consumption of the electric load 30 reaches 1000 Wh is recorded in the storage unit 131. Further, when the solar panel 211 is generating power, it is desirable to record the battery voltage at the time when the amount of power obtained by subtracting the amount of generated power from the amount of power consumed by the electrical load 30 reaches 1000 Wh in the storage unit 131. .

As the deterioration of the storage battery 213 progresses, the capacity of the storage battery 213 decreases. Therefore, even if the power consumption is the same, the reduction rate of the remaining battery capacity increases. Since the relationship between the battery remaining amount of the storage battery 213 and the battery voltage has linearity, the battery voltage at the time when the power consumption reaches a predetermined amount as described above, the deterioration of the storage battery 213 proceeds. And drop. That is, the battery voltage at the time when the amount of power consumed by the electrical load 30 reaches a predetermined amount after the storage battery 213 reaches full charge is the elapsed time from the start of use of the storage battery 213 as indicated by a straight line L2 in FIG. Decreases with the number of days.

On the other hand, after the storage battery 213 is replaced with a new one, the battery voltage of the storage battery 213 measured under the same conditions becomes higher than before the replacement. From this, as shown in FIG. 8, it is possible to estimate that the storage battery 213 has been replaced when the battery voltage has risen beyond a predetermined threshold after the replacement date P3 of the storage battery 213.

The evaluation unit 13 determines that the storage battery 213 has been replaced when an event that the battery voltage recorded in the storage unit 131 has increased beyond a predetermined threshold is detected, and in the storage unit 121 and the storage unit 131, Data accumulated due to deterioration of the storage battery 213 is deleted. This process also prevents the user from forgetting to delete the data because the user only needs to replace the storage battery 213 and does not need to delete the data in the storage unit 121 and the storage unit 131.

In the storage battery management device 10 A described above, the evaluation unit 13 includes a storage unit 131 that stores data related to the degree of deterioration evaluated for the storage battery 213. In addition, the evaluation unit 13 indicates that the storage battery 213 has been replaced when the amount of change between the battery voltage in the state in which the storage battery 213 is not discharged and the battery voltage in the state in which the storage battery 213 is discharged falls below a predetermined threshold. presume. Alternatively, the evaluation unit 13 indicates that the storage battery 213 has been replaced when the battery voltage at the time when the amount of discharged electric power reaches a predetermined amount in a state where the storage battery 213 is discharged rises above a predetermined threshold. It may be estimated. When it is estimated that the storage battery 213 has been replaced, the evaluation unit 13 deletes the data regarding the degree of deterioration of the storage battery 213 stored in the storage unit 131. According to this configuration, the evaluation unit 13 replaces the storage battery 213. Since it is estimated based on the battery voltage of the storage battery 213, it is not necessary to provide another device in order to detect replacement of the storage battery 213. In addition, when the storage battery 213 is replaced, data relating to the degree of deterioration of the storage battery 213 is deleted from the storage unit 131. Therefore, the user can simply replace the storage battery 213, and the evaluation unit 13 can detect the deterioration of the new storage battery 213. It becomes possible to evaluate the degree.

The processing for erasing data stored in the storage unit 121 and the storage unit 131 described above can be applied to any of the first embodiment, the second embodiment, and the third embodiment. That is, the process at the time of replacement of the storage battery described above is a process of deleting the above-described data not only in the storage battery management apparatus 10A of the first embodiment but also in the storage battery management apparatus 10B of the second embodiment or the storage battery management apparatus 10C of the third embodiment. Is applicable.

The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made according to design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it can be changed.

Claims

An information acquisition unit for acquiring information on the charge state of the storage battery;
A state in which the state where the storage battery is charged and has reached full charge is extracted from information on the state of charge of the storage battery, and a counting unit that counts the number of occurrences of the state that has reached full charge,
An evaluation unit that evaluates the degree of deterioration of the storage battery using the number of occurrences counted by the counting unit;
An output unit for outputting the evaluation result of the evaluation unit,
The said storage battery is a lead storage battery charged using the generated electric power of a solar cell. The storage battery management apparatus characterized by the above-mentioned.
The generated power of the solar cell is charged to the storage battery through a charging device,
The information acquisition unit
Configured to obtain information on the state of charge of the storage battery from the charging device;
The counting unit is configured to determine that a state in which surplus power not used for charging the storage battery is generated in the generated power of the solar battery is a state in which the full charge has been reached. The storage battery management apparatus according to 1.
A clock unit for measuring the elapsed time from the start of use of the storage battery,
The evaluation unit is
Estimating the remaining time until the replacement time using the evaluated degree of deterioration of the storage battery and the elapsed time measured by the clock unit,
The output unit is
The storage battery management device according to claim 1, wherein a remaining time until the replacement time is output as an evaluation result of the evaluation unit.
Using information on the state of charge of the storage battery, further comprising a monitoring unit for extracting the maximum discharge depth of the storage battery in a period from when the storage battery reaches the full charge to the next full charge;
The evaluation unit is
The standard deterioration degree indicating the degree of deterioration of the storage battery in a period from when the storage battery reaches the full charge to the next full charge is configured to be associated with the maximum discharge depth.
The degree of deterioration from the start of use of the storage battery is evaluated by accumulating the standard deterioration degree corresponding to the maximum discharge depth each time the counting unit counts the number of occurrences. 3. The storage battery management device according to 3.
The clock unit is
The information acquisition unit is configured to time the duration of the state where the storage battery is not fully charged using the information acquired,
The evaluation unit is
A correction deterioration level indicating the degree of deterioration of the storage battery in the duration of the state where the storage battery is not fully charged is configured to correspond to the duration.
The storage battery management apparatus according to claim 4, wherein the degree of deterioration from the start of use of the storage battery is corrected by the correction deterioration degree according to the duration of the state where the storage battery is not fully charged.
A discriminating unit that discriminates a state in which the storage battery is charged with a predetermined voltage that is higher than usual using the information acquired by the information acquiring unit;
The evaluation unit is
In preparation for the case where the storage battery is charged at a predetermined voltage which is higher than usual, a charge recovery degree representing the degree of deterioration when the storage battery is charged at the predetermined voltage is defined,
The degree of deterioration from the start of use of the storage battery is corrected by the charge recovery degree when the determination unit determines that the storage battery is charged at the predetermined voltage. Storage battery management device.
The information acquisition unit is configured to acquire information related to an environmental temperature of the storage battery,
The evaluation unit is
The temperature degradation degree representing the degree of degradation of the storage battery according to the environmental temperature is configured to be associated with a representative value of the environmental temperature of the storage battery in a predetermined unit period,
The degree of deterioration from the start of use of the storage battery is evaluated by accumulating the degree of temperature deterioration corresponding to the representative value of the environmental temperature for each unit period. The storage battery management device according to item 1.
A switch that is provided in an electric circuit between an electric load to which electric power is supplied from a storage battery and configured to select one of an on state that conducts the electric circuit and an off state that interrupts the electric circuit; and It is used in conjunction with a power supply facility that includes a controller that switches between an on state and an off state of the switch,
The storage battery is a lead storage battery that is charged using the power generated by a solar battery,
An information acquisition unit for acquiring information on the charge state of the storage battery;
The transition of the change in battery voltage of the storage battery before and after switching from off to on of the switch is recorded, and the relationship between the elapsed time from the start of use of the storage battery and the change using the recorded change An evaluation unit that calculates a regression equation that represents the period until the battery reaches the battery life using the regression equation;
An output unit that outputs an evaluation result of the evaluation unit.
The evaluation unit is
A storage unit for storing data relating to the degree of deterioration evaluated for the storage battery;
When the fluctuation of the battery voltage in the state where the storage battery is not discharged and the battery voltage in the state where the storage battery is discharged is reduced beyond a predetermined threshold, it is estimated that the storage battery has been replaced,
The storage battery management device according to any one of claims 1 to 8, wherein data relating to a degree of deterioration of the storage battery stored in the storage unit is deleted.
The evaluation unit is
A storage unit for storing data relating to the degree of deterioration evaluated for the storage battery;
When the battery voltage at the time when the amount of discharged electric power reaches a predetermined amount in a state where the storage battery is discharged is estimated to exceed the predetermined threshold, the storage battery is estimated to be replaced,
The storage battery management device according to any one of claims 1 to 8, wherein data relating to a degree of deterioration of the storage battery stored in the storage unit is deleted.