JP6893831B2 - Self-supporting power supply system - Google Patents

Description

The present invention is for storing power generation functions such as solar cells, small hydropower generation, wind power generation, etc., in which the amount of power generation fluctuates depending on the season and the amount of power generation depends on the installation location, and the power generated by the power generation function. Concerning a self-contained power system with batteries.

In recent years, due to the influence of power-saving LEDs, low power consumption of communication devices, and the like, self-sustaining power supply systems having various power generation functions have been put into practical use without power supply from the power system.

For example, a sensor light for the entrance that illuminates the LED while detecting the approach of a person with an infrared sensor is a self-supporting power supply type that charges with a solar cell in the sunshine and uses that power to illuminate the LED at night. Sensor lights are on sale. In such a system, a nickel-metal hydride battery is often used as a battery for storing electric power, and it is required to replace the battery once every 2 to 5 years.

In addition, road signs with LED lights, which have the function of generating electricity from solar cells and wind power generation, have been commercialized. In the case of road signs, there is a limitation that batteries cannot be easily replaced because many of them are fixed by digging holes in the road, such as road studs. Therefore, in general, a capacitor having excellent environmental resistance but being expensive and having a large volume is used.

Further, in the prior art described in Japanese Patent Application Laid-Open No. 5-122388, there is a technology related to a system that automatically performs meter reading of gas, water, electricity, etc. using a telephone line to save labor or rationalize meter reading work. It is shown. In such prior art, a method using a battery is often used for reasons such as measures against a power failure or wiring work of a power supply. Further, when a battery is used, various measures have been taken to reduce the current consumption as much as possible in order to extend the battery life. Then, in order to notify the administrator of the battery life, the battery voltage is constantly or periodically monitored, and when the battery voltage drops to a predetermined voltage, this is detected and notified by a display means or a reporting means. The technology to do is described.

Further, Japanese Patent No. 3533152 discloses a method in which a solar cell, a main battery, and a backup battery are provided, and when the output voltage of the main battery becomes equal to or less than a predetermined value, the battery is switched to the backup battery. It is essential that the main battery is a secondary battery such as a lithium-ion battery, but the backup battery does not necessarily have to be a secondary battery, and it has been shown that a large-capacity condenser or a primary battery may be used.

Further, Japanese Patent No. 416369 describes the system installation area as a method for eliminating the memory effect of the nickel-metal hydride battery when the nickel-metal hydride battery is used as the battery for the self-supporting power supply system using the solar cell. A method of receiving the target weather record and weather forecast, accumulating them in a database, and determining the charge amount based on this information is disclosed.

Further, in Japanese Patent No. 5854211, regarding a solar power source including a solar cell and a secondary battery, the predicted value of the future power generation amount or the predicted value of the operating state of the load is referred to, and the secondary battery is described. A method of extending the life of a secondary battery by lowering the charging voltage is disclosed.

Japanese Unexamined Patent Publication No. 5-122388 Japanese Patent No. 3533152 Japanese Patent No. 4163649 Japanese Patent No. 5854211

All of the above prior arts are excellent, but they have the following problems.

(A) In outdoor applications, especially in applications where the housing is exposed to direct sunlight, it has been extremely difficult to provide a secondary battery that can withstand long-term use of 10 years or more. In such a case, it is necessary to lower the charging voltage for use, but there is a problem that many secondary batteries must be installed because the capacity becomes insufficient due to the lowering of the charging voltage. Therefore, in many cases, it was necessary to replace the secondary battery every 2 to 5 years. Further, Japanese Patent No. 5854211 discloses a method of setting the charging voltage so as to predict future weather information and secure only the required charging capacity. However, when the weather forecast is incorrect, the battery The problem of running out of capacity could occur.

(B) If the number of days when the amount of power generation is low continues more than expected, there is a problem that the capacity of the secondary battery becomes insufficient and the devices supplied with power from the self-supporting power supply system may stop. If the device to be stopped is, for example, lighting, it may be within the permissible range, but it is socially permissible assuming that many communication devices will be driven by a self-supporting power supply system in the future due to the reduction in power consumption of communication devices. There is a risk that it will not be done.

(C) Further, if the days when the amount of power generation is low continues more than expected, the discharge voltage falls below the permissible lower limit voltage, and there is a problem that the secondary battery cannot be used thereafter. For example, in the case of a lithium ion battery, when the discharge voltage falls below a certain voltage, the copper foil, which is the base material of the negative electrode material, becomes copper ions and elutes into the electrolytic solution, and these copper ions are discharged during the next charging. There was a problem that the positive electrode and the negative electrode were short-circuited by depositing as copper. Furthermore, when copper ions are eluted in the electrolytic solution, iron is more likely to become ions than copper, so copper is deposited as a metal and iron becomes ions and is eluted in the electrolytic solution, resulting in holes in the can. There was a problem that the flammable electrolyte leaked to the outside when it opened. In order to prevent these problems from occurring, lithium-ion batteries that have fallen below the permissible lower limit voltage have been required to be controlled by a protection circuit so that they cannot be charged thereafter.

(D) In addition, in order to solve the above problems, communication technology is used to remotely monitor the self-supporting power supply system, or to predict future weather information and remotely control the daily charge / discharge conditions of the battery. Although a method of doing so has been proposed, communication costs and server operating costs are high and often impractical.

The means for solving the above problems will be described with reference to FIG. In order to solve the above problems, the self-supporting power supply system of the present invention includes a power generation means (power generation unit 701), a power storage means (secondary battery 702) for storing the power generated by the power generation means, and a charge of the power storage means. A charge / discharge control means (charge / discharge control unit 703) for controlling discharge and a power supply switching means (power switching unit 704) for outputting the power generated by the power generation means and / or the power discharged from the power storage means. A self-supporting power supply system (700) equipped with the above, and further, a charging voltage that stores a date and time information calculation means (real-time clock unit 705) and a charging voltage information according to the date and time when charging the power storage means. The pattern storage means (charge voltage pattern storage unit 706) and the battery system control means (battery system control unit 707) that determines the charge voltage based on the date and time information obtained from the date and time information calculation means and the charge voltage information. The charging / discharging control means is characterized in that the charging / discharging means is charged and controlled by the charging voltage.

Further, the self-supporting power supply system of the present invention includes a power generation means (power generation unit 701), a power storage means (secondary battery 702) for storing the power generated by the power generation means, and a charge / discharge control for charging / discharging the power storage means. Independent with a control means (charge / discharge control unit 703) and a power supply switching means (power supply switching unit 704) for outputting the power generated by the power generation means and / or the power discharged from the power storage means. It is a type power supply system (700), and further, according to the date and time information calculation means (real-time clock unit 705), the regional information input means (regional information input unit 901), and the region and date and time when charging the power storage means. Date and time information obtained from the charging voltage pattern storage means (charging voltage pattern storage unit 706) that stores the charging voltage information, the date and time information calculation means (real-time clock unit 705), and regional information and regional information obtained from the regional information input means. A battery system control means (battery system control unit 707) that determines a charge voltage based on the charge voltage information is provided, and the charge / discharge control means charges and controls the power storage means with the charge voltage. To do.

In a self-sustaining power supply system that uses a generator as a power source, such as a solar cell, the battery tends to deteriorate, so there is a problem that the battery must be replaced frequently. According to the present invention, the required battery capacity for each season is calculated from the statistical data of the temperature and the amount of solar radiation throughout the year, and the charging voltage for the battery is controlled to a value that secures the required battery capacity. As a result, the battery capacity can be kept low in the summer when the amount of solar radiation is large and the battery tends to deteriorate. When the battery capacity is kept low, the life of the battery can be extended, so that the frequency of battery replacement can be reduced. Further, since this effect differs depending on the region, it is possible to construct a more reliable self-sustaining power supply system by calculating the required battery capacity for each region.

In the above cases, the case where the secondary battery is installed outdoors together with the solar cell has been described, but the present invention is not limited to the combination of the solar cell and the secondary battery, and the amount of rainfall is, for example, in winter. It is also effective when the amount of power generation is small in winter and large in summer, such as a self-supporting power generation system powered by a small hydroelectric generator in a small area.

In the above explanation, it is assumed that the power consumption of the load equipment does not change throughout the year. However, even in applications where the power consumption of load equipment differs between summer and winter, such as a self-contained power supply system with a lighting function that uses a solar cell as a power source for a heater for melting snow on the road, the charging voltage is applied in summer. It is possible to lower it. Even in such a case, the life of the mounted secondary battery can be extended, so that the effect of the present invention is not lost.

As described above, the basis of the present invention is different from the prior art in that charging control is performed in consideration of the season, region, and application, and further, information on the amount of solar radiation and temperature based on past statistics in advance is used. Since the charging voltage is determined based on this, there is a feature that the risk of predicting the weather on a daily basis can be avoided. In addition, since it is not necessary to obtain weather information by communication, it goes without saying that communication costs and operating costs of the weather information forecast server and the like can be reduced.

It is a figure which shows the occurrence frequency of continuous unlit days all over the country in the past 20 years. It is a figure which shows the number of occurrences by month of 3 or more consecutive unlit days all over the country in the past 20 years. It is a figure which shows the total total solar radiation amount (Tokyo) in the past 20 years. It is a figure which shows the simulation result (Tokyo) of the battery power consumption by a load. It is a block diagram which shows the effect of prolonging a life by lowering a charging voltage. It is a figure which shows the daily average temperature (Tokyo) in the past 20 years. It is a block diagram which shows the self-supporting power supply system in the 1st Embodiment of this invention. It is a block diagram which shows the self-supporting power-source system of the modification of the 1st Embodiment of this invention. It is a block diagram which shows the self-supporting power supply system in the 2nd Embodiment of this invention. It is a figure which compares the monthly solar radiation amount of December in the past 20 years in Niigata and Tokyo. It is a figure which shows the simulation result (Niigata) of the battery power consumption by a load. It is a figure explaining the method of determining the charge voltage pattern from the required storage capacity. It is a figure explaining the effect in the 2nd Embodiment of this invention.

<Outline of the present invention>
As a result of diligent studies, the inventors have invented the following (A) to (D) as a method for solving the above problems. Hereinafter, a detailed description will be given.

(A) First, the basic concept for solving the problem described in (a) above will be described with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing the frequency of consecutive unlit days in major cities from 1997 to 2016 in various parts of Japan. The non-lighting days are the days when the daylight hours are less than 0.1 hours, and the continuous non-lighting days are the number of consecutive non-lighting days. In the case of a self-supporting power supply system that uses a solar cell as a power source, it is common to determine the capacity of the secondary battery so that the number of continuous non-illumination compensation days can be about 3 to 5 days. According to the results of this survey, it is possible to supply power to equipment that is sufficiently loaded in 20 years, with a few exceptions, if a secondary battery is installed for about 5 consecutive unlit days. You can see that.

However, in the self-supporting power supply system of the present invention, since power is supplied to a communication device that requires extremely high reliability, 10 days or more of the longest continuous unlit days (9 days) or more based on the results of 20 years. It is necessary to install a daily amount of secondary batteries. In this case, since the capacity of the secondary battery must be doubled, there is a problem that the manufacturing cost becomes high. In order to examine the required capacity of the secondary battery, the inventors decided to consider the season when continuous unlit days occur. For example, if the continuous unlit days are summer, the sunshine hours are short, but even in cloudy or rainy weather, the amount of solar radiation that passes through the clouds and reaches the ground is large, so it may not be a problem.

FIG. 2 summarizes the months in which three or more consecutive unlit days occur in FIG. It can be seen that there are many consecutive unlit days in the summer in cities on the Pacific coast such as Sendai and Tokyo. On the other hand, in Niigata and Naha, there are many consecutive unlit days in winter.

Figure 3 summarizes the total solar radiation data for 20 years in Tokyo. On days when the amount of solar radiation is low, such as when the amount of solar radiation is higher in summer than in winter and the total amount of solar radiation is 1 MJ / square meter or less, there are more continuous unlit days than in summer when there are many continuous unlit days. It turned out that there were few, but many in winter. Therefore, we decided to estimate by simulation whether the problem is actually likely to occur in summer or winter. Assuming that the power consumption of the load equipment is constant, we calculated how many days' worth of secondary batteries should be installed if the solar cells generate electricity in proportion to the amount of solar radiation that changes daily. As shown in the calculation results in FIG. 4, the season when a large capacity of the secondary battery to be mounted is required was not the summer when the number of unlit days was large, but the winter when the amount of solar radiation was small.

By the way, when a secondary battery such as a lithium ion battery is used outdoors, the biggest deterioration factor is the electrolysis reaction of the electrolytic solution inside the battery, which occurs when the charging voltage is increased. When the electrolytic solution inside the battery is decomposed into a gas, the pressure inside the battery rises, causing leakage of the electrolytic solution, which becomes a serious deterioration factor. The inventors considered that the electrolysis reaction rate of the electrolytic solution is likely to be proportional not only to the charging voltage but also to the temperature.

FIG. 5 shows the results (including some estimation results) of the storage performance test at an environmental temperature of 45 ° C. to 85 ° C. by changing the battery capacity by changing the charging voltage. As is clear from this figure, it was found that the usable days of the lithium-ion battery greatly depends not only on the battery capacity (charging voltage) but also on the environmental temperature. For example, when the charging voltage is 3.9 V, the usable days can be expected to be about 4,000 days when the environmental temperature is 45 ° C, but the battery may reach the end of its life in about 10 days when the environmental temperature is 85 ° C. all right. Therefore, when the environmental temperature is high, deterioration progresses quickly, so it is important to take measures in a high temperature environment in summer (especially when exposed to direct sunlight).

FIG. 6 is a plot of the daily average temperature for 20 years in Tokyo. Needless to say, the temperature in summer is higher than that in winter, so the battery tends to deteriorate.

Here, as shown in FIG. 4, the inventors set the charging voltage in the summer (high temperature season) when the problem of running out of the battery is less likely to occur even if the capacity of the secondary battery is about 3 to 4 days. By lowering it, we came up with a method to significantly extend the life of the battery. In winter (low temperature season) when the possibility of running out of battery is high, by raising the charging voltage and increasing the battery capacity after charging sufficiently, it is extremely reliable that it is hard to run out of battery without increasing the number of secondary batteries. A highly self-supporting power supply system can be configured. For example, by controlling the charge capacity to be 100% in winter and controlling the charge capacity to about 60% in summer, even when the environmental temperature is 45 ° C, it is 10 years or more. The usable number of days (about 4,000 days) can be expected (Fig. 5).

Furthermore, in addition to controlling the charging voltage according to the season, it is also important to be able to control the charging voltage in consideration of information on the area and application where the self-supporting power supply system is installed. This is because the environmental temperature and the amount of solar radiation differ depending on the region, so information on the region and application is required to obtain the optimum charging voltage. In order to realize the above method, the information on the area and usage and the charging voltage pattern information corresponding to the season are stored in the self-supporting power supply system in advance, and the information on the area and usage is stored at the time of installation. By setting, it becomes possible to realize the optimum charging voltage control.

(B) In addition, if the number of days when the amount of power generation is low continues longer than expected, there is a problem that the capacity of the secondary battery becomes insufficient and the devices supplied with power from the self-supporting power supply system may stop. It was. In order to solve this problem, it is effective to add a primary battery to the system (A). In general, industrial primary batteries such as lithium manganese dioxide batteries are cheaper than secondary batteries, have excellent long-term storage performance, and have a wide usable temperature range. Taking advantage of these characteristics of the primary battery, it is equipped with a secondary battery that can withstand a load of about 5 days, which requires frequent charging and discharging, and is installed in the case of long-term power generation shortage that occurs very rarely. You can use the primary battery that you are using. As a result, even in the case of an unexpected long-term power generation shortage, it is possible to avoid a situation in which the necessary power cannot be supplied to the load equipment.

(C) Further, if the days when the amount of power generation is low continues more than expected, the discharge voltage falls below the permissible lower limit voltage, and there is a problem that the secondary battery cannot be used thereafter. In order to solve this problem, it is effective to use the method described in (B) and then charge the secondary battery from the primary battery when the amount of power generation is lower than expected for a long time. Is. By doing so, the discharge voltage of the secondary battery does not fall below a certain voltage, so that it is possible to prevent a situation in which the flammable electrolytic solution leaks to the outside.

(D) Further, in the conventional problem-solving method, a method of predicting the future weather and remotely controlling the daily charge / discharge conditions of the battery has been proposed, but in the present invention, the weather is not necessarily predicted. Since there is no need to remotely control the battery, there is an advantage that communication costs and server operating costs can be saved.

Hereinafter, the means for specifically realizing the present invention will be specifically described by dividing it into two embodiments.
<First Embodiment>
FIG. 7 is a block diagram of the self-supporting power supply system 700 according to the present invention. A solar cell is used for the power generation unit 701, and the electric power generated here is distributed to the load device 708 and the charge / discharge control unit 703 via the power supply switching unit 704. (Originally, power is supplied to loads other than the charge / discharge control unit 703 of the self-supporting power supply system 700, but since it is self-evident, the power generation unit 701 will be omitted below.) , It functions to be preferentially supplied to the load device 708, and the surplus electric power is charged to the secondary battery 702 via the charge / discharge control unit 703. When the generated power of the power generation unit 701 cannot supply sufficient power to the load device 708, the power stored in the secondary battery 702 is supplied to the load device 708 via the charge / discharge control unit 703 and the power supply switching unit 704. Will be done.

Further, the charging voltage pattern storage unit 706 divides the year into 12 months in advance, and stores the charging voltage to be used in each month. Further, when charging the secondary battery 702, the battery system control unit 707 obtains the date and time information from the real-time clock unit 705 and recognizes the month when the battery is charged. Then, the battery system control unit 707 obtains appropriate charge voltage information corresponding to the month from the charge voltage pattern storage unit 706, and transmits the charge voltage information to the charge / discharge control unit 703.

The charge / discharge control unit 703 charges the secondary battery 702 with the charging voltage transmitted from the battery system control unit 707. When a lithium ion battery is used as the secondary battery 702, for example, so-called CCCV (Constant Current Constant Voltage) charging is performed. That is, the charge / discharge control unit 703 charges the lithium ion battery with a constant current at the start of charging, and after the voltage of the lithium ion battery reaches the above-specified charging voltage, charges the lithium ion battery for a predetermined time. Charge the lithium-ion battery with voltage.

Based on the invention in the first embodiment, the effect of (A) above can be obtained.

FIG. 8 is a modification of the first embodiment in which the primary battery 801 is added to the configuration of FIG. 7. When the electric power generated by the power generation means and the remaining amount of electric power stored in the power storage means are equal to or less than a predetermined value, the primary battery supplies power to the load device 708. By adding a primary battery, the above effects (B) and (C) can be further obtained.
<Second embodiment>
FIG. 9 is a block diagram of the self-supporting power supply system 700 according to the present invention, in which a regional information input means (regional information input unit 901) is added to the configuration of FIG. A solar cell is used for the power generation unit 701, and the electric power generated here is distributed to the load device 708 and the charge / discharge control unit 703 via the power supply switching unit 704. (Originally, power is supplied to loads other than the charge / discharge control unit 703 of the self-supporting power supply system 700, but since it is self-evident, the power generation unit 701 will be omitted below.) , It functions to be preferentially supplied to the load device 708, and the surplus electric power is charged to the secondary battery 702 via the charge / discharge control unit 703. When the generated power of the power generation unit 701 cannot supply sufficient power to the load device 708, the power stored in the secondary battery 702 is supplied to the load device 708 via the charge / discharge control unit 703 and the power supply switching unit 704. Will be done. Further, when sufficient power cannot be supplied to the load device 708 only by the electric power stored in the secondary battery 702, the electric power stored in the primary battery 801 is supplied to the load device 708 via the power switching unit 704.

In the area information input unit 901, information (referred to as area information) corresponding to the area or use in which the self-supporting power supply system 700 is installed in advance is input. Further, the charging voltage pattern storage unit 706 divides the year into 12 months in advance, and stores the charging voltage of each month for each regional information. Further, when charging the secondary battery 702, the battery system control unit 707 obtains the date and time information from the real-time clock unit 705 and recognizes the month when the battery is charged. Further, the area information is obtained from the area information input unit 901. Then, the battery system control unit 707 obtains the charge voltage information corresponding to the appropriate area and month from the charge voltage pattern storage unit 706, and transmits the charge voltage to the charge / discharge control unit 703.

The charge / discharge control unit 703 charges the secondary battery 702 with the charging voltage transmitted from the battery system control unit 707. When a lithium ion battery is used as the secondary battery 702, for example, the above-mentioned CCCV charging is performed.

Based on the invention in the second embodiment, the effect of (A) above can be obtained.

Although FIG. 9 shows the case where the primary battery 801 is included as a configuration, the configuration may not include the primary battery 801 as in the case of FIG. 7. In that case, the effects of (B) and (C) above cannot be obtained.

Next, an embodiment in which the charging voltage pattern stored in the charging voltage pattern storage unit 706 is changed depending on the region will be described. Figure 10 compares the total amount of solar radiation in December over the past 20 years in Tokyo and Niigata. In Niigata, there is a lot of snow in winter, so the amount of solar radiation is also low. The minimum amount of solar radiation in December for 20 years is 109 MJ / square meter in 2006 in Niigata and 208 MJ / square meter in 2002 in Tokyo, and it can be seen that the amount of solar radiation in Niigata in December is about half that of Tokyo. Therefore, if the power consumption of the load equipment is the same, a solar cell with twice the output is required.

FIG. 11 shows the result of performing the same calculation as in FIG. 4 for Niigata. The power consumption of the load equipment and the capacity of the installed secondary battery were the same as in Fig. 4, and in the case of Niigata, only the power generation capacity of the solar cell was calculated as twice that of Tokyo. In Tokyo, there is a lot of rain in the summer, so about 3 days' worth of battery capacity is required in the summer, but in the case of Niigata, there is also the effect of doubling the output of the solar cell, and the battery capacity in the summer is 1-2. It turned out that a day's worth was enough.

Therefore, as shown in FIGS. 12 (a) and 12 (b), the battery capacity required for each month is determined in Tokyo and Niigata, and based on this, the charging voltage pattern is determined as shown in (c) and (d). decide. By doing so, it can be expected that the life of the secondary battery will be further improved in Niigata.

FIG. 13 shows the result of simulating the effect of the present invention. The charging voltage pattern shown in FIG. 13 (a) was created based on the daily insolation amount and average temperature of Tokyo and Niigata over the past 20 years. It was assumed that the temperature inside the housing in which the secondary battery is stored is 15 ° C. higher than the environmental temperature. The estimated life was calculated in consideration of the deterioration of the electrolytic solution due to electrolysis, assuming that the daily charge amount and power consumption were constant.

FIG. 13B shows the simulation results. In both Tokyo and Niigata, when charging without changing the charging voltage throughout the year as in the conventional method, the life of the secondary battery was 2 to 3 years, but as in the charging voltage pattern in Tokyo, charging in the summer By lowering the voltage, the life is improved up to about 20 years. In Niigata, the charging voltage can be further reduced, so an estimated life of 40 years or more was obtained.

In this simulation, deterioration due to repeated charging and discharging many times is not taken into consideration, so it is assumed that the actual life will actually be shorter than this estimated life result. However, even in the case of repeated charging / discharging, a low charging voltage works advantageously, so that the present invention does not work disadvantageously.

The self-supporting power supply system of the present invention may be provided with a communication function. When an unexpected failure occurs and the amount of power generation is reduced, it is possible to detect that the primary battery has been used and notify the occurrence of an abnormality by communication, so that a more reliable system can be provided. Even in this case, since daily communication volume for weather prediction is unnecessary, it is possible to improve the reliability of the system at extremely low cost.

The present invention is for storing power generation functions such as solar cells, small hydropower generation, wind power generation, etc., in which the amount of power generation fluctuates depending on the season and the amount of power generation depends on the installation location, and the power generated by the power generation function. Concerning a self-contained power system with batteries. In particular, if it is applied to road signs such as road studs with LED lights equipped with a self-supporting power supply system, self-supporting power supply systems with built-in communication equipment, solar sensor lights, solar street lights, etc., great effects can be expected.

701 Power generation unit 702 Secondary battery 703 Charge / discharge control unit 704 Power supply switching unit 705 Real-time clock unit 706 Charging voltage pattern storage unit 707 Battery system control unit 708 Load device 801 Primary battery 901 Regional information input unit

Claims (5)

Power generation means and
A power storage means for storing the electric power generated by the power generation means and
A charge / discharge control means that controls the charge / discharge of the power storage means,
A power supply switching means for outputting the electric power generated by the power generation means and / or the electric power discharged from the power storage means, and
A self-contained power supply system that supplies power to a load equipped with
The amount of power generated by the power generation means fluctuates depending on the season,
When the generated power of the power generation means cannot supply sufficient power to the load, the power stored in the power storage means is supplied to the load via the power switching means.
Furthermore, the date and time information calculation means and
A charging voltage pattern storage means that stores charging voltage information according to the date and time when the storage means is charged, and
The battery system control means for determining the charging voltage based on the date and time information obtained from the date and time information calculating means and the charging voltage information according to the date and time is provided.
The charge / discharge control means is a self-supporting power supply system characterized in that the charge / discharge control means is charged and controlled by the charge voltage. Power generation means and
A power storage means for storing the electric power generated by the power generation means and
A charge / discharge control means that controls the charge / discharge of the power storage means,
A power supply switching means for outputting the electric power generated by the power generation means and / or the electric power discharged from the power storage means, and
A self-contained power supply system that supplies power to a load equipped with
The amount of power generated by the power generation means varies depending on the season and the point where it is installed.
When the generated power of the power generation means cannot supply sufficient power to the load, the power stored in the power storage means is supplied to the load via the power switching means.
Furthermore, the date and time information calculation means and
Local information input means and
A charging voltage pattern storage means for storing charging voltage information according to the area and date and time when charging the storage means, and a charging voltage pattern storage means.
The battery system control means for determining the charging voltage based on the date and time information obtained from the date and time information calculating means , the area information obtained from the area information input means , and the charging voltage information according to the area and the date and time is provided. ,
The charge / discharge control means is a self-supporting power supply system characterized in that the charge / discharge control means is charged and controlled by the charge voltage. A request for supplying electric power to a load device connected to the self-sustaining power supply system when the primary battery is provided and the electric power generated by the power generation means and the remaining charge of the storage means are equal to or less than a predetermined value. Item 2. The self-supporting power supply system according to Item 1 or 2. The self-sustaining power supply system according to claim 1 or 2, wherein the battery system control means determines the charging voltage to be lower in the high temperature season than in the low temperature season. The power storage means is a lithium ion battery, and the charge / discharge control means charges the lithium ion battery with a predetermined constant current at the start of charging, and the voltage of the lithium ion battery reaches the charging voltage. The self-supporting power supply system according to claim 1 or 2, wherein charging control is performed to charge the lithium ion battery with the charging voltage for a predetermined time.

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