Secondary battery system, control method, and computer-readable recording medium

Abstract

A secondary battery system, a control method, and a computer-readable recording medium are provided. The secondary battery system 1 includes a first secondary battery, a second secondary battery having higher charge-discharge performance per unit time, and a power control device that controls input power of the first secondary battery and the second secondary battery based on control information. The control information includes prediction weather information indicating weather predicted at a power supply target, power demand information indicating power demand of each date time of the power supply target, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first charge amount information indicating a charge amount of the first secondary battery and input power information indicating power input to the secondary battery system 1, salt concentration information indicating a salt concentration in the first secondary battery, and second charge amount information indicating a charge amount of the second secondary battery.

Description

TECHNICAL FIELD

[0001] The present application relates to a secondary battery system, a control method, and a computer-readable recording medium that control power in a system. BACKGROUND

[0002] Conventionally, output-type secondary batteries and capacity-type secondary batteries have been used. The output-type secondary batteries have a characteristic that the charge-discharge performance per unit time is high but the storage capacity is small, as compared with the capacity-type secondary batteries. On the other hand, the capacity-type secondary batteries have a characteristic that the charge-discharge performance per unit time is low but the storage capacity is large, as compared with the output-type secondary batteries. Various techniques for controlling power in a secondary battery system including both of the output-type secondary batteries and the capacity-type secondary batteries have been proposed.

[0003] In the secondary battery system disclosed in Patent Literature 1, the input-output current of the capacity-type battery is controlled based on the temperature of the output-type battery.

[0004] Further, the secondary battery system disclosed in Patent Literature 2 controls the distribution of the electric power to the capacity-type electric power storage device and the output-type electric power storage device based on the deterioration states of the capacity-type electric power storage device and the output-type electric power storage device and the required electric power of the secondary battery system.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: International Publication No. 2018 / 074502

[0008] Patent Literature 2: International Publication No. 2019 / 186659 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, in the secondary battery system disclosed in Patent Literature 1, there is a problem that the input power of the output-type battery and the capacity-type battery cannot be controlled by factors other than the temperature of the output-type battery. Similarly, in the secondary battery system disclosed in Patent Literature 2, there is a problem that the input power of the output-type electric power storage device and the capacity-type electric power storage device cannot be controlled by factors other than the deterioration states of the capacity-type electric power storage device and the output-type electric power storage device and the required electric power of the secondary battery system.

[0011] The present application has been made to solve the above problems, and aims to provide a secondary battery system, a control method, and a computer-readable recording medium storing a control program, which can control the input power of the output-type battery and the capacity-type battery based on various factors.

[0012] Means for solving the problem

[0013] One aspect of the present application relates to a secondary battery system including:

[0014] a first secondary battery;

[0015] a second secondary battery, which has a higher charge-discharge performance per unit time than the first secondary battery; and

[0016] a power control device that controls input power of the first secondary battery and the second secondary battery based on control information, wherein

[0017] the control information includes at least one of predicted weather information indicating weather predicted at a power supply target, power demand information indicating a power demand of each date and time of the power supply target, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first charge amount information indicating a charge amount of the first secondary battery, and input power information indicating a power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and second charge amount information indicating a charge amount of the second secondary battery.

[0018] Further, in a case where the predicted weather information indicates rainfall, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0019] Moreover, a charge capacity of the first secondary battery is larger than that of the second secondary battery,

[0020] The power control device can increase the input power of the first secondary battery in a case where a consumed power of the power supply target is below a predetermined power consumption amount, based on the power demand information.

[0021] Further, in a case where the power selling information is above a predetermined power selling price, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0022] Moreover, the power control device can decrease the input power of a secondary battery having a higher temperature among the first secondary battery and the second secondary battery and increase the input power of a secondary battery having a lower temperature, based on the temperature information.

[0023] Further, in a case where the first secondary battery is a secondary battery containing an intercalator,

[0024] In a case where the charge amount of the first secondary battery indicated by the first charge amount information exceeds a predetermined first charge amount and the power indicated by the input power information exceeds a predetermined power, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0025] Also, in a case where it is determined based on the salt concentration information that there is a sign that the salt concentration unevenness in the first secondary battery is to occur, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0026] Further, the power control device preferentially performs power supply to the second secondary battery,

[0027] In a case where the state of charge of the second secondary battery indicated by the second state of charge information exceeds a predetermined third state of charge, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0028] Further, in a case where the state of charge of the second secondary battery indicated by the second state of charge information is equal to or lower than a predetermined third state of charge, the power control device can limit the input power of the first secondary battery and increase the input power of the second secondary battery.

[0029] The secondary battery system further includes a power distribution device that distributes the power input to the secondary battery system and supplies the power to the first secondary battery and the second secondary battery,

[0030] The power distribution device inputs a low-frequency component of the power input to the secondary battery system to the first secondary battery and inputs a high-frequency component of the power input to the secondary battery system to the second secondary battery,

[0031] The power control device can adjust the amount of power supplied to the first secondary battery and the second secondary battery by adjusting the amount of power output by the power distribution device.

[0032] One aspect of the present application relates to a control method for controlling power of a secondary battery system including a first secondary battery and a second secondary battery whose charge-discharge performance per unit time is higher than that of the first secondary battery; the control method including:

[0033] A computer controls input power of the first secondary battery and the second secondary battery based on control information,

[0034] The control information includes at least one of prediction weather information indicating weather predicted at a power supply target, power demand information indicating power demand of each date and time of the power supply target, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first state of charge information indicating a state of charge of the first secondary battery, and second state of charge information indicating a state of charge of the second secondary battery, input power information indicating power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and the second state of charge information.

[0035] Further, an aspect of the present application relates to a computer-readable recording medium storing a control program for controlling electric power of a secondary battery system including a first secondary battery and a second secondary battery whose charge-discharge performance per unit time is higher than that of the first secondary battery;

[0036] The control program causes a computer to control input electric power of the first secondary battery and the second secondary battery on the basis of control information,

[0037] The control information includes at least one of predicted weather information indicating weather predicted at a power supply target, power demand information indicating power demand of the power supply target for each date and time, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first charge amount information indicating a charge amount of the first secondary battery, input electric power information indicating electric power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and second charge amount information indicating a charge amount of the second secondary battery.

[0038] Effects of Invention

[0039] According to the present application, it is possible to provide a secondary battery system, a control method, and a computer-readable recording medium storing a control program, which can control input electric power of an output-type battery and a capacity-type battery on the basis of various factors. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a schematic view of a secondary battery system according to an embodiment of the present application.

[0041] Figure 2 is a block diagram showing the structure of a power control device according to an embodiment of the present application.

[0042] Figure 3 is a schematic view of the relationship between required electric power (DP) of a secondary battery system, input electric power (CP) of a capacity-type battery, and input electric power (OP) of an output-type battery.

[0043] Figure 4 is a schematic view of the relationship between capacity and output of a capacity-type battery and an output-type battery. DETAILED DESCRIPTION

[0044] An embodiment of the present application will be described below with reference to the accompanying drawings. Figure 1is a schematic view of a secondary battery system 1 according to an embodiment of the present application. The secondary battery system 1 is a system that stores and supplies electric power supplied from the outside. For example, the secondary battery system 1 can be installed as an electric power system managed by an electric power company or the like. The secondary battery system 1 includes a capacity-type battery 10, an output-type battery 20, an electric power control device 30, and an electric power distribution device 40.

[0045] The capacity-type battery 10 is a secondary battery having a larger electric storage capacity than the output-type battery 20. The capacity-type battery 10 corresponds to a first secondary battery. The output-type battery 20 is a secondary battery having a higher charge-discharge performance per unit time than the capacity-type battery 10. The output-type battery 20 corresponds to a second secondary battery. As shown in FIG. 1, the capacity-type battery 10 and the output-type battery 20 are connected in parallel. In addition, although a single capacity-type battery 10 and a single output-type battery 20 are shown, the secondary battery system 1 can include a plurality of capacity-type batteries 10 and a plurality of output-type batteries 20. In this case, the plurality of capacity-type batteries 10 and the plurality of output-type batteries 20 are each connected in parallel. Figure 1 Figure 1 Although a single capacity-type battery 10 and a single output-type battery 20 are shown, the secondary battery system 1 can include a plurality of capacity-type batteries 10 and a plurality of output-type batteries 20. In this case, the plurality of capacity-type batteries 10 and the plurality of output-type batteries 20 are each connected in parallel.

[0046] The electric power distribution device 40 is a device that distributes input electric power in accordance with the control of the electric power control device 30 and supplies the electric power to the capacity-type battery 10 and the output-type battery 20. As a specific example of the electric power distribution device 40, a low-pass filter or the like can be cited. The electric power distribution device 40 can supply a low-frequency component of the input electric power to the capacity-type battery 10 and a high-frequency component of the input electric power to the output-type battery 20.

[0047] The electric power control device 30 is a device that controls the input electric power of the capacity-type battery 10 and the output-type battery 20 on the basis of various control information. The electric power control device 30 can adjust the amount of electric power supplied to the capacity-type battery 10 and the output-type battery 20 by adjusting the amount of electric power output by the electric power distribution device 40.

[0048] For example, in a case where the input electric power of the capacity-type battery 10 is limited to increase, the electric power control section 301 can limit the input electric power of the capacity-type battery 10 by causing the electric power distribution device 40 to output electric power of a lower frequency. Specifically, the electric power control section 301 can cause the amount of electric power supplied from the electric power distribution device 40 to the capacity-type battery 10 to decrease by causing the frequency band of the electric power that can be supplied from the electric power distribution device 40 to the capacity-type battery 10 to narrow, thereby decreasing the input electric power of the capacity-type battery 10. In this case, the amount of electric power supplied from the electric power distribution device 40 to the output-type battery 20 increases, and the input electric power of the output-type battery 20 increases.

[0049] ​In a case where the input power of the capacity-type battery 10 is to be increased, the power control section 301 can increase the input power of the capacity-type battery 10 by causing the power distribution device 40 to output a higher frequency of power. Specifically, the power control section 301 can increase the amount of power supplied from the power distribution device 40 to the capacity-type battery 10 by expanding the frequency band of the power that can be supplied by the power distribution device 40 to the capacity-type battery 10, thereby increasing the input power of the capacity-type battery 10. In this case, the amount of power supplied from the power distribution device 40 to the output-type battery 20 is decreased, and the input power of the output-type battery 20 is decreased.

[0050] Figure 2 is a block diagram illustrating a structure of the power control device 30 according to an embodiment of the present application. The power control device 30 includes a communication interface (I / F) 31, a storage device 32, and an arithmetic device 33. The communication I / F 31 is an interface that performs transmission and reception of signals between the power control device 30 and other devices.

[0051] The storage device 32 is a storage device that stores a control program executed by the arithmetic device 33 and various information processed by the arithmetic device 33.

[0052] The arithmetic device 33 is an arithmetic device such as a central processing unit (CPU), a micro processing unit (MPU), or the like. The arithmetic device 33 executes a control method prescribed by a control program stored in the storage device 32 by executing the control program. The control program includes a control information acquisition section 300 and a power control section 301. In addition, an integrated circuit such as a field-programmable gate array (FPGA), an application specific integrated circuit (ASIC), or the like can also execute the control program.

[0053] The control information acquisition section 300 is a program that acquires control information used by the power control section 301. The control information includes at least one of (1) prediction weather information indicating weather predicted at a power supply target of the secondary battery system 1, (2) power demand information indicating a power demand of the secondary battery system 1 for each date and time of the power supply target, (3) power selling information indicating a power selling price, (4) temperature information indicating a temperature of the capacity-type battery 10 and a temperature of the output-type battery 20, (5) first charge amount information indicating a charge amount of the capacity-type battery 10 and input power information indicating a power input to the secondary battery system 1, (6) salt concentration information indicating a salt concentration in the capacity-type battery 10, and (7) second charge amount information indicating a charge amount of the output-type battery 20.

[0054] The electric power control section 301 is a program that controls the input electric power of the capacity-type battery 10 and the output-type battery 20 based on various control information. Specifically, in a case where the predicted weather information shows rainfall, the electric power control section 301 can limit the input electric power of the capacity-type battery 10 and increase the input electric power of the output-type battery 20.

[0055] Further, the electric power control section 301 can increase the input electric power of the capacity-type battery 10 based on the electric power demand information when the consumption electric power of the power supply target of the secondary battery system 1 is equal to or less than a predetermined electric power consumption amount. The predetermined electric power consumption amount can be set to, for example, an electric power consumption amount in a time period in which the consumption electric power of the power supply target is small.

[0056] Further, in a case where the power selling information is equal to or more than a predetermined power selling price, the electric power control section 301 can limit the input electric power of the capacity-type battery 10 and increase the input electric power of the output-type battery 20. As a result of increasing the input electric power of the output-type battery 20, the predetermined power selling price can be set to a price equal to or more than a price corresponding to an increase in long-term replacement cost due to a reduction in the life of the output-type battery 20.

[0057] Further, the electric power control section 301 can decrease the input electric power of the secondary battery that has a higher temperature and increase the input electric power of the secondary battery that has a lower temperature, among the first secondary battery 10 and the second secondary battery 20, based on the temperature information. Specifically, in a case where the temperature of the capacity-type battery 10 is higher than the temperature of the output-type battery 20, the electric power control section 301 decreases the input electric power of the capacity-type battery 10 and increases the input electric power of the output-type battery 20. On the other hand, in a case where the temperature of the output-type battery 20 is higher than the temperature of the capacity-type battery 10, the electric power control section 301 decreases the input electric power of the output-type battery 20 and increases the input electric power of the capacity-type battery 10.

[0058] Further, in a case where the charge amount of the capacity-type battery 10 shown by the first charge amount information exceeds a predetermined first charge amount, the electric power control section 301 can limit the input electric power of the capacity-type battery 10 and increase the input electric power of the output-type battery 20 when the electric power shown by the input electric power information exceeds a predetermined electric power. In a case where the capacity-type battery 10 is a secondary battery that contains an intercalator (lithium ion or the like), the predetermined first charge amount and the predetermined electric power can be a charge amount and an electric power value at which the intercalator in the capacity-type battery 10 can be extracted. Therefore, in a case where the charge amount of the capacity-type battery 10 exceeds the charge amount at which the intercalator in the capacity-type battery 10 can be extracted and the electric power input to the secondary battery system 1 exceeds the electric power value at which the intercalator can be extracted, the electric power control section 301 limits the input electric power of the capacity-type battery 10 and increases the input electric power of the output-type battery 20.

[0059] Further, in a case where it is determined based on the salt concentration information that there is a sign that the salt concentration in the capacity-type battery 10 is to become uneven, the power control section 301 can limit the input power of the capacity-type battery 10 and increase the input power of the output-type battery 20.

[0060] For example, the power control section 301 can capture a sign that the salt concentration is to become uneven by detecting an increase in the amount of extrusion of the electrolyte caused by expansion and contraction of the negative electrode during continuous charge and discharge of the capacity-type battery 10. Further, the power control section 301 can capture a sign that the salt concentration is to become uneven by detecting a shift in the Li (lithium) salt in the face direction of the capacity-type battery 10. The face direction refers to the direction connecting the positive electrode current collector and the negative electrode current collector of the capacity-type battery 10. Also, the power control section 301 can capture a sign that the salt concentration is to become uneven by detecting a decrease in the capacity retention rate of the capacity-type battery 10. Also, a sign that the salt concentration is to become uneven can be captured by detecting a rising trend in the resistance value of the capacity-type battery 10. Also, a sign that the salt concentration is to become uneven can be captured by detecting expansion of the electrolyte caused by a temperature rise of the capacity-type battery 10.

[0061] Further, the power control section 301 can control the input power of the capacity-type battery 10 and the output-type battery 20 based on second charge amount information indicating the charge amount of the output-type battery 20. Specifically, the power control section 301 preferentially performs power supply to the output-type battery 20, and in a case where the charge amount of the output-type battery 20 indicated by the second charge amount information exceeds a predetermined second charge amount, the input power of the output-type battery 20 can be limited and the input power of the capacity-type battery 10 can be increased. The second charge amount can be below the maximum capacity of the output-type battery 20. Further, in a case where the charge amount of the output-type battery 20 indicated by the second charge amount information is below a predetermined third charge amount, the input power of the output-type battery 20 can be increased and the input power of the capacity-type battery 10 can be limited. The third charge amount can be smaller than the second charge amount.

[0062] Figure 3 is a schematic view of the relationship between the required power (DP) of the secondary battery system 1, the input power (CP) of the capacity-type battery 10, and the input power (OP) of the output-type battery 20. Power equal to or greater than the required power (DP) is supplied to the secondary battery system 1 and is stored in the capacity-type battery 10 and the output-type battery 20.

[0063] First, the power supply to the output-type battery 20 is preferentially performed, the input power (OP) of the output-type battery 20 is increased, and the charge capacity of the output-type battery 20 is increased. When the charge capacity of the output-type battery 20 exceeds the second charge capacity, the power control portion 301 limits the input power (OP) of the output-type battery 20 and increases the input power (CP) of the capacity-type battery 10. As a result, the charge capacity of the output-type battery 20 is decreased, and the charge capacity of the capacity-type battery 10 is increased.

[0064] When the charge capacity of the output-type battery 20 is the third charge capacity or less, the power control portion 301 limits the input power (CP) of the capacity-type battery 10 and increases the input power (OP) of the output-type battery 20. As a result, the charge capacity of the capacity-type battery 10 is decreased, and the charge capacity of the output-type battery 20 is increased. In this way, the power control portion 301 can control the input powers of the capacity-type battery 10 and the output-type battery 20 based on the charge capacity of the output-type battery 20.

[0065] In the above-described embodiment, the secondary battery system 1 includes the first secondary battery 10, the second secondary battery 20 having a higher charge-discharge performance per unit time than the first secondary battery 10, and the power control device 30. The power control device 30 controls the input powers of the first secondary battery 10 and the second secondary battery 20 based on control information. The control information includes at least one of predicted weather information indicating weather predicted at a power supply target, power demand information indicating a power demand of the power supply target for each date and time, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery 10 and a temperature of the second secondary battery 20, input power information indicating a power input to the secondary battery system 1, salt concentration information indicating a salt concentration in the first secondary battery 10, and second charge capacity information indicating a charge capacity of the second secondary battery 20.

[0066] In a case where the predicted weather information indicates rainfall, the power control device 30 limits the input power of the first secondary battery 10 and increases the input power of the second secondary battery 20. In the case of rainfall, the power consumption amount of the power supply target can increase. Therefore, by increasing the charge capacity of the second secondary battery 20 having a higher charge-discharge performance in advance, it is possible to quickly cope with an increase in the power consumption amount of the power supply target.

[0067] Further, the power control device 30 increases the input power of the first secondary battery 10 having a larger charge capacity than the second secondary battery 20, based on the power demand information, when the consumption power of the power supply target is the predetermined power consumption amount or less. For example, the input power of the first secondary battery 10 is increased at night or the like when the consumption power of the power supply target is small. Thus, in the secondary battery system 1, it is possible to efficiently store a large amount of power.

[0068] Further, in a case where the power selling information is a power selling price or more, the power control device 30 limits the input power of the first secondary battery 10 and increases the input power of the second secondary battery 20. Thus, the amount of power output from the second secondary battery 20 having a higher charge-discharge performance can be increased, and thus the power selling revenue can be increased. For example, in a case where the power selling price reaches a price corresponding to an increase in the long-term replacement cost due to a decrease in the life of the second secondary battery 20 as the amount of power output increases, the power selling revenue can be increased by increasing the amount of power output from the second secondary battery 20, and thus the profitability can be increased.

[0069] Further, the power control device 30 reduces the input power of the secondary battery having a higher temperature among the first secondary battery 10 and the second secondary battery 20 and increases the input power of the secondary battery having a lower temperature, on the basis of the temperature information. Thus, the temperature of the secondary battery having a higher temperature can be decreased, and the degradation of the secondary battery can be suppressed.

[0070] Further, in a case where the first charge amount of the first secondary battery 10 exceeds a predetermined first charge amount and the input power exceeds a predetermined power, the power control device 30 limits the input power of the first secondary battery 10 and increases the input power of the second secondary battery 20. In a case where the capacity-type battery 10 is a secondary battery containing an intercalator, the predetermined first charge amount and the predetermined power can be a charge amount and a power value at which the intercalator in the capacity-type battery 10 can be deintercalated. Thus, in a case where the charge amount of the first secondary battery 10 containing the intercalator exceeds the charge amount at which the intercalator can be deintercalated and the power input to the secondary battery system 1 exceeds the power value at which the intercalator can be deintercalated, the power control device 30 limits the input power of the first secondary battery 10. As a result, the deintercalation of the intercalator in the first secondary battery 10 can be suppressed.

[0071] Further, in a case where it is determined on the basis of the salt concentration information that there is a sign that the salt concentration in the first secondary battery 10 is to become uneven, the power control device 30 limits the input power of the first secondary battery 10 and increases the input power of the second secondary battery 20. Thus, the unevenness of the salt concentration in the first secondary battery 10 can be eliminated before the salt concentration in the first secondary battery 10 becomes uneven.

[0072] Further, the power control device 30 can preferentially supply power to the second secondary battery 20. In a case where the charge amount of the second secondary battery 20 indicated by the second charge amount information exceeds a predetermined third charge amount, the power control unit 301 can limit the input power of the first secondary battery 10 and increase the input power of the second secondary battery 20. The third charge amount can be a value smaller than the second charge amount, for example, 50% of the maximum capacity. Thus, the second secondary battery 20 can be efficiently used since the input power of the second secondary battery 20, which has high charge-discharge performance, is increased again when the charge amount of the second secondary battery 20 reaches 50% of the maximum capacity.

[0073] Further, in a case where the charge amount of the second secondary battery 20 indicated by the second charge amount information is equal to or less than a predetermined third charge amount, the power control device 30 can limit the input power of the first secondary battery 10 and increase the input power of the second secondary battery 20. The third charge amount can be a value smaller than the second charge amount, for example, 50% of the maximum capacity. Thus, the second secondary battery 20 can be efficiently used since the input power of the second secondary battery 20, which has high charge-discharge performance, is increased again when the charge amount of the second secondary battery 20 reaches 50% of the maximum capacity.

[0074] In the secondary battery system 1 including the plurality of capacity-type batteries 10 and output-type batteries 20, the power control device 30 performs the above-described control and analyzes the usage conditions of the capacity-type batteries 10 and the output-type batteries 20, so that the optimum number of the capacity-type batteries 10 and the output-type batteries 20 can be grasped. Thus, the cost of the secondary battery system 1 can be reduced by providing the optimum number of the capacity-type batteries 10 and the output-type batteries 20 in the secondary battery system 1.

[0075] Figure 4 is a schematic view of the capacity and output of the capacity-type battery 10 and the output-type battery 20. If the secondary battery system 1 is composed only of the capacity-type battery 10, since the output performance per unit time of the capacity-type battery 10 is lower than that of the output-type battery 20, more capacity-type batteries 10 need to be prepared in order to achieve the output required for the secondary battery system 1. On the other hand, in a case where the secondary battery system 1 is composed only of the output-type battery 20, since the capacity of the output-type battery 20 is smaller than that of the capacity-type battery 10, more output-type batteries 20 need to be prepared in order to achieve the capacity required for the secondary battery system 1.

[0076] Since the secondary battery system 1 according to one embodiment of the present application includes the output-type battery 20 having higher output performance per unit time than the capacity-type battery 10, the number of the capacity-type batteries 10 required to achieve the output required for the secondary battery system 1 can be reduced. Further, since the secondary battery system 1 includes the capacity-type battery 10 having larger capacity than the output-type battery 20, the number of the output-type batteries 20 required to achieve the capacity required for the secondary battery system 1 can be reduced.

[0077] The power control device 30 can control the input power of the capacity-type battery 10 and the output-type battery 20 using all of the above-described control information. In a case where the control of the capacity-type battery 10 and the output-type battery 20 based on a plurality of control information conflict with each other, the power control device 30 can control the input power of the capacity-type battery 10 and the output-type battery 20 in accordance with the predetermined priority of the control information. The priority of the control information can be arbitrarily set.

[0078] For example, the power control device 30 can increase the input power of the capacity-type battery 10 when the consumption power of the power supply target of the secondary battery system 1 is below a predetermined power consumption amount based on the power demand information, whereas the power control device 30 can limit the input power of the capacity-type battery 10 and increase the input power of the output-type battery 20 when it is determined that there is a sign of occurrence of the salt concentration unevenness in the capacity-type battery 10 based on the salt concentration information. In this case, for example, the priority of the salt concentration information can be set to be higher than that of the power demand information. Thus, the power control device 30 can limit the input power of the capacity-type battery 10 and increase the input power of the output-type battery 20 even in a case where it is determined that there is a sign of occurrence of the salt concentration unevenness in the capacity-type battery 10 when the consumption power of the power supply target of the secondary battery system 1 is below a predetermined power consumption amount. Therefore, the salt concentration unevenness in the capacity-type battery 10 can be prevented in advance.

[0079] Further, the power distribution device 40 inputs the low-frequency component of the input power to the first secondary battery 10 and inputs the high-frequency component of the input power to the second secondary battery 20. By adjusting the frequency of the power input to the secondary battery system 1, the power control device 30 can adjust the amount of electricity supplied to the first secondary battery 10 and the second secondary battery 20. Thus, the storage capacity of the first secondary battery 10 and the second secondary battery 20 can be adjusted by adjusting the frequency of the input power of the secondary battery system 1. Further, the second secondary battery 20 having higher charge-discharge performance can be supplied with high-frequency power having less degradation.

[0080] In the above example, the program includes a group of instructions (or software code) for causing a computer to execute one or more functions described in the embodiments when read into the computer. The program can be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example, and not limitation, the computer-readable medium or the tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD), or other memory technology, CD-ROM, digital versatile disk (DVD), Blu-ray (registered trademark) disk, or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage, or other magnetic storage devices. The program can be transmitted over a transitory computer-readable medium or a communication medium. By way of example, and not limitation, the transitory computer-readable medium or the communication medium includes electrical, optical, acoustical, or other form of propagated signals. The computer includes various devices such as a personal computer (PC), a server, a CPU, an MPU, an FPGA, an ASIC, and the like.

[0081] The present application is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present application.

[0082] Explanation of Reference Signs

[0083] 1 Secondary battery system

[0084] 10 Capacity-type battery, 1st secondary battery

[0085] 20 Output-type battery, 2nd secondary battery

[0086] 30 Electric power control device

[0087] 32 Storage device

[0088] 33 Arithmetic device

[0089] 300 Control information acquisition section

[0090] 301 Electric power control section

[0091] 40 Electric power distribution device

[0092] DP Required electric power of secondary battery system

[0093] CP Input electric power of capacity-type battery

[0094] OP Input electric power of output-type battery

Claims

1. A secondary battery system comprising: a first secondary battery; a second secondary battery, a charge-discharge performance per unit time of which is higher than that of the first secondary battery; and a power control device that controls input power of the first secondary battery and input power of the second secondary battery based on control information, wherein the control information includes at least two of: prediction weather information indicating weather predicted at a power supply target, power demand information indicating a power demand of each date time of the power supply target, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first charge amount information indicating a charge amount of the first secondary battery, and input power information indicating a power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and second charge amount information indicating a charge amount of the second secondary battery, in a case where control of the first secondary battery and the second secondary battery based on the control information conflict with each other, the power control device controls the input power of the first secondary battery and the input power of the second secondary battery in accordance with a predetermined priority of the control information. in a case where the prediction weather information indicates rainfall, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery.

2. The secondary battery system according to claim 1, wherein 3. The secondary battery system according to claim 1 or 2, wherein a charge capacity of the first secondary battery is larger than that of the second secondary battery, the power control device increases the input power of the first secondary battery when a consumed power of the power supply target is below a predetermined power consumption amount based on the power demand information. in a case where the power selling information is above a predetermined power selling price, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery.

4. The secondary battery system according to any one of claims 1 to 3, wherein the power control device decreases the input power of a secondary battery having a higher temperature and increases the input power of a secondary battery having a lower temperature among the first secondary battery and the second secondary battery based on the temperature information.

5. The secondary battery system according to any one of claims 1 to 4, wherein 6. The secondary battery system according to any one of claims 1 to 5, wherein in a case where the first secondary battery is a secondary battery containing an intercalator, in a case where the charge amount of the first secondary battery indicated by the first charge amount information exceeds a predetermined first charge amount and the power indicated by the input power information exceeds a predetermined power, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery. in a case where it is determined based on the salt concentration information that there is a sign that a salt concentration in the first secondary battery is to become uneven, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery.

7. The secondary battery system according to any one of claims 1 to 6, wherein 8. The secondary battery system according to any one of claims 1 to 7, wherein the power control device preferentially performs power supply to the second secondary battery, ​ In a case where the state of charge of the second secondary battery indicated by the second state of charge information exceeds a predetermined third state of charge, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery.

9. The secondary battery system according to claim 8, wherein In a case where the state of charge of the second secondary battery indicated by the second state of charge information is equal to or lower than the predetermined third state of charge, the power control device limits the input power of the first secondary battery and increases the input power of the second secondary battery.

10. The secondary battery system according to any one of claims 1 to 9, further comprising: a power distribution device that distributes the power input to the secondary battery system and supplies the power to the first secondary battery and the second secondary battery, the power distribution device inputs a low-frequency component of the power input to the secondary battery system to the first secondary battery and inputs a high-frequency component of the power input to the secondary battery system to the second secondary battery, the power control device adjusts the amount of power supplied to the first secondary battery and the second secondary battery by adjusting the amount of power output by the power distribution device.

11. A control method for controlling power of a secondary battery system, the secondary battery system including a first secondary battery and a second secondary battery having higher charge-discharge performance per unit time than the first secondary battery; the control method including: a computer controlling input power of the first secondary battery and the second secondary battery based on control information, wherein the control information includes at least two of prediction weather information indicating weather predicted at a power supply target, power demand information indicating power demand of each date and time of the power supply target, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first state of charge information indicating a state of charge of the first secondary battery and input power information indicating power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and second state of charge information indicating a state of charge of the second secondary battery, in a case where control of the first secondary battery and the second secondary battery based on the control information conflict with each other, the computer controls input power of the first secondary battery and the second secondary battery in accordance with a predetermined priority of the control information.

12. A computer-readable recording medium storing a control program for controlling power of a secondary battery system, wherein the secondary battery system includes a first secondary battery and a second secondary battery having higher charge-discharge performance per unit time than the first secondary battery; the control program causes a computer to control input power of the first secondary battery and the second secondary battery based on control information, The control information includes at least two of: predicted weather information indicating weather predicted at a power supply target, power demand information indicating a power demand of the power supply target for each date and time, power selling information indicating a power selling price, temperature information indicating a temperature of the first secondary battery and a temperature of the second secondary battery, first charge amount information indicating a charge amount of the first secondary battery, input power information indicating a power input to the secondary battery system, salt concentration information indicating a salt concentration in the first secondary battery, and second charge amount information indicating a charge amount of the second secondary battery, The control of the input power of the first secondary battery and the second secondary battery includes, in a case where the control of the first secondary battery and the second secondary battery based on the control information conflict with each other, the computer controlling the input power of the first secondary battery and the second secondary battery in accordance with a predetermined priority of the control information.

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