JP2013183509A - Charge/discharge amount prediction system and charge/discharge amount prediction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charge/discharge amount prediction system capable of estimating an electric power value on the basis of the high-accuracy chargeable and dischargeable capacity allowing for characteristic dispersion and deterioration progress of each of secondary batteries without estimation and simulation processes that would apply heavy loads.SOLUTION: A battery controller includes charge/discharge test request means that requests an energy management device to conduct a charge/discharge test at a regular interval. The energy management device includes charge/discharge test permission means that permits the battery controller to conduct the charge/discharge test. A power storage device includes: electric voltage measurement means for a secondary battery in the power storage device; temperature measurement means for the secondary battery; charge and discharge means for carrying out a constant electric current charge and/or a constant electric current discharge for the secondary battery with a prescribed electric current value; data processing means; and data storage means. If the request for conducting the charge/discharge test from the request means is permitted by the charge/discharge test permission means, the charge/discharge test is conducted.

Description

  Embodiments described herein relate generally to a prediction system and a prediction method for chargeable / dischargeable capacity and chargeable / dischargeable electric energy of a secondary battery.

  In a charge / discharge amount prediction system used for power generation using automobiles (EV, HEV) or natural energy (solar power generation, wind power generation), load fluctuation suppression, peak shift, etc., the secondary battery is at any point in time. It is important to predict how much storage capacity (Ah) can be charged or discharged. Similarly, it is possible to predict how much electric power (Wh) can be charged or discharged at an arbitrary time.

  In general, secondary batteries have a large change in chargeable / dischargeable capacity and power amount due to ambient temperature conditions and aging deterioration. There is a risk of hindering the target fluctuation suppression and peak shift.

  Therefore, a standard maximum power value that can be charged and discharged under conditions such as the remaining battery level (SOC) of the secondary battery and the temperature of the secondary battery is experimentally determined and tabulated as a characteristic value table. Used to predict the charge / discharge power value under any conditions (interpolation and extrapolation if necessary).

Japanese Patent Laid-Open No. 11-187577 JP 2002-58113 A JP 2007-306771 A JP 2008-42960 Gazette

  However, the charge / discharge power value is predicted from the standard uniform relational expression for the chargeable / dischargeable power under various conditions according to the type of the storage battery. For this reason, since it is impossible to dynamically cope with characteristic variations of individual secondary batteries and characteristic deterioration that progresses with time, an error in prediction of charge / discharge power increases. As a result, in order to secure an operational margin, it is necessary to look at the predicted value smaller, and as a result, the practical performance of the charge / discharge amount prediction system is low.

  In addition, the internal state of the secondary battery at an arbitrary point in time is estimated from the voltage, current, temperature, etc., and the results can be used to predict chargeable / dischargeable power so that it is possible to cope with characteristic variations and deterioration progress. In addition, the processing load of internal state estimation and simulation is heavy, and since it is indirect estimation via parameters such as internal resistance, a considerable amount of error accompanying estimation / simulation is unavoidable. Remained low.

  Embodiments of the present invention have been proposed to solve the above-described problems, and do not perform heavy load processing such as estimation and simulation, and cope with variations in characteristics and deterioration of individual secondary batteries. The high-accuracy chargeable / dischargeable capacity is obtained to estimate the power value. Accordingly, it is an object to reduce unnecessary margins, maximize the performance of the secondary battery, and enhance the practical secondary battery performance.

  In order to achieve the above object, the charge / discharge amount prediction system of the present embodiment includes a power storage device, a power conditioner device, a power system, a battery controller, and an energy management device. The battery controller includes a test charge / discharge test execution requesting unit that requests the energy management device to perform charge / discharge for testing at a constant cycle. The energy management device includes charge / discharge permission means for testing that permits charge / discharge for testing to the battery controller. The power storage device includes: a secondary battery voltage measuring unit in the power storage device; a temperature measuring unit of the secondary battery; and charging / discharging for performing constant current charging and / or constant current discharging on the secondary battery at a predetermined current value. Means, data processing means, and data storage means. When the test charge / discharge request of the test charge / discharge test execution means is permitted by the test charge / discharge permission means, the test charge / discharge is performed.

It is a block diagram which shows the structure of 1st Embodiment. It is a block diagram which shows the battery management system of 1st Embodiment. It is a flowchart which shows the operation example of the battery controller of 1st Embodiment. It is a flowchart which shows the charging / discharging operation example for a test by the battery controller of 1st Embodiment. It is a graph which shows an example of the charging / discharging pattern for a test in 1st Embodiment. It is a table | surface which shows an example of the table | surface of the charging / discharging end point in the case of constant current charging / discharging in 1st Embodiment. It is a table | surface which shows the chargeable / dischargeable capacity | capacitance of each temperature obtained in the case of the constant current charging / discharging in 2nd Embodiment. It is a table | surface which shows an example of the table | surface of the charging / discharging end point in the case of constant power charging / discharging in other embodiment. It is a table | surface which shows the electric energy which can be charged / discharged of each temperature obtained in the case of the constant power charging / discharging in other embodiment. It is a table | surface which shows the example which enriched the data by the side of long-time charging / discharging for stationary electricity storage systems in other embodiment.

  Hereinafter, a charge / discharge amount prediction system according to an embodiment of the present invention will be specifically described with reference to FIGS.

1. First Embodiment [1-1. Constitution]
The charge / discharge amount prediction system according to the first embodiment will be described in detail with reference to FIG. FIG. 1 is a block diagram showing a charge / discharge amount prediction system of the present embodiment. The charge / discharge amount prediction system of the present embodiment includes a power storage device (a), a battery controller (b), an information network (c), and an energy management device (hereinafter referred to as EMS) (d). .

(1) Power Storage Device (a) The power storage device (a) of the present embodiment includes a battery cell 11, a battery management system (hereinafter referred to as BMS) 12, a power conditioner device (hereinafter referred to as PCS) 3, and Consists of The battery cell 11 is a secondary battery in which a plurality of unit battery cells are connected in series. The PCS 3 is a device that converts electricity generated by a solar battery (module) or the like so that it can be used by the battery cell 11. The positive electrode and the negative electrode of the power storage device (a) are connected to the PCS 3. At this time, the battery cell 11 and the PCS 3 are connected so that a current flows bidirectionally between the battery cell 11 and the PCS 3. BMS2 is also connected to PCS3.

(2) Information network (c)
The information network (c) of the present embodiment is a network including the network of the power system 4. This information network (c) is connected to the PCS 3, the battery controller (b), and the EMS (d). Accordingly, the PCS 3 is connected to the battery controller (b) and the EMS (d) via the information network (c), and can communicate with each other.

(3) EMS (d)
The EMS (d) of the present embodiment predicts the power generation amount of a solar power generation system or wind power generation system, which is a natural energy source (not shown) connected to the power system 4, and the load amount of various load devices of power consumers. Etc. Further, in order to stabilize the voltage and frequency of the electric power system 4, the power storage device (a) is charged / discharged via the PCS 3 for the purpose of suppressing fluctuations in power generation amount and / or load amount, peak shifting, and the like.

  The EMS (d) determines whether or not the test charge / discharge can be performed at that time based on the target fluctuation suppression, peak shift, etc., and the battery controller (b) is charged with the test charge / discharge. Charging / discharging permission means for testing. That is, during the charging / discharging for the test, not only the original charge / discharge cannot be performed, but also the charging / discharging for the test may cause the influence on the system.

(4) Battery controller (b)
The battery controller (b) of the present embodiment acquires the temperature of the storage battery and the remaining battery level (SOC) from the battery management system, and calculates a chargeable / dischargeable power value from the acquired temperature and remaining battery level (SOC). Is. The obtained charge / discharge power value is output to EMS (d). In addition, charge / discharge for testing that requires the EMS (d) to perform charge / discharge for testing at an appropriate cycle such that the change in characteristics due to the deterioration of the battery cell 11 over time cannot be ignored, for example, once a month. A test execution request means is provided.

(5) Internal Configuration of Power Storage Device (a) The internal configuration of the power storage device (a) of the present embodiment will be described in detail with reference to FIG. FIG. 2 is a block diagram showing an internal configuration of the power storage device (a) of the present embodiment. The power storage device of this embodiment includes a battery cell 11 and a battery management system. This battery management system includes a voltage measurement unit 2, a current measurement unit 3, a temperature measurement unit 4, a control unit 5, a storage unit 6, and a communication interface 7.

  The battery cell 11 has a plurality of unit battery cells connected in series. Between the positive electrode and the negative electrode of the unit battery cell constituting the battery cell 11, a voltage measuring unit 2 for measuring the voltage of the unit battery cell is connected in parallel with the unit battery cell. The voltage measurement unit 2 measures the voltage of each unit battery cell. The current measuring unit 3 is connected in series to the positive electrode or the negative electrode of the battery cell 11. The current measuring unit 3 measures the current flowing through the battery cell 11. A temperature measurement unit 4 is installed in the vicinity of the battery cell 11. The temperature measuring unit 4 measures the temperature of the battery cell 11.

  The voltage measuring unit 2, the current measuring unit 3 and the temperature measuring unit 4 are connected to the control unit 5. The control unit 5 is data processing means and is connected to the storage unit 6 and the communication interface 7. The voltage measured by the voltage measuring unit 2, the current measured by the current measuring unit 3, and the temperature measured by the temperature measuring unit 4 are input to the control unit 5 as measurement data of the battery cell 11. The measurement data of the battery cell 11 is input to the storage unit 6 connected to the control unit 5. The storage unit 6 is a data storage unit and stores input measurement data. The storage unit 6 also stores test of charge / discharge results, beginning of life (BOL) data, and characteristic value data.

[1-2. Action]
(1) Basic Action The basic action of the charge / discharge amount prediction system having the above configuration will be described with reference to FIG.

  The battery controller (b) determines whether or not a certain period has elapsed since the previous charge / discharge for the test. That is, it is determined whether or not an appropriate period has passed so that the change in characteristics due to the deterioration of the battery cell 11 over time cannot be ignored. This period is set to one month in FIG. 3, but this period can be appropriately selected (STEP 01). If the predetermined period has not elapsed (NO in STEP01), the process waits until the predetermined period elapses.

  On the other hand, if a certain period of time has elapsed (YES in STEP 01), the EMS (d) is requested to perform charge / discharge for testing. In the EMS (d) for which the charge / discharge for the test is requested, it is determined whether the charge / discharge for the test is possible. The EMS (d) determines whether or not the charge / discharge for the test can be performed at that time based on the plan of the target fluctuation suppression, peak shift, and the like. This is because during the charge / discharge for the test, not only the intended charge / discharge can be performed, but also the charge / discharge for the test may cause an influence on the system (STEP 02).

  If EMS (d) does not permit the execution of charge / discharge for testing (NO in STEP 03), it waits until it is permitted. On the other hand, the battery controller 5 waits for permission of EMS (d) (YES in STEP 03), and then performs charge / discharge for testing (STEP 04). Then, after the charge / discharge for the test is completed, the charge / discharge capacity / power value characteristic value table data is updated based on the data obtained by the test charge / discharge (STEP 05).

(2) Test Charge / Discharge Test charge / discharge of this embodiment will be described with reference to FIGS. FIG. 4 is a flowchart showing an example of a test charge / discharge operation by the battery controller, and FIG. 5 is a graph showing an example of a test charge / discharge pattern.

  This test charging / discharging is charging / discharging by the specific pattern implemented when there is a surplus power according to the condition of the charge side or discharge side load as a charge / discharge amount prediction system. As a method of obtaining charge / discharge for testing, step-down charge and step-down discharge are performed, and charge end points and discharge end points at a plurality of current levels are obtained collectively. Based on this result, the charge / discharge capacity until the end of charge / discharge at each current value is predicted.

  In step-down charging and step-down discharging, charging or discharging is performed from a current having a large absolute value. In the present embodiment, after discharging under the condition of 3C, discharging is performed under the conditions of 2C and 1C. Thereafter, charging is performed under conditions of 3C, and then charging is performed under conditions of 2C and 1C. The current conditions can be selected as appropriate. In other words, as step-down discharge, the discharge starts from 10C, and the current is gradually reduced to 0.5C in a stepwise manner. The step-down charge starts from 10C and reaches 0.5C. It is also possible to charge the battery by decreasing the absolute value of the current.

  As shown in (1) of FIG. 5, discharge is first performed at 3C (three times the hourly rate discharge). This discharge is continued until the discharge end point is reached (STEP 101 in FIG. 4). When the discharge under the 3C condition reaches the discharge termination point, the remaining battery level SOC_3Cd, the battery temperature T_3Cd, and the battery voltage V_3Cd immediately before termination are stored (STEP 102 in FIG. 4).

Subsequently, as shown in (2) of FIG. 5, discharging at 2C is performed. This discharge is continued until the discharge end point is reached (STEP 103 in FIG. 4). When the discharge under the 2C condition reaches the discharge termination point, the remaining battery level SOC_2Cd, the battery temperature T_2Cd, and the battery voltage V_2Cd immediately before termination are stored (STEP 104 in FIG. 4).

  Similarly, as shown in (3) of FIG. 5, discharge at 1C is performed. This discharge is continued until the discharge end point is reached (STEP 105 in FIG. 4). When the discharge under the 1C condition reaches the discharge termination point, the remaining battery level SOC_1Cd, the battery temperature T_1Cd, and the battery voltage V_1Cd immediately before termination are stored (STEP 106 in FIG. 4).

  Next, as shown in (4) of FIG. 5, charging is performed at 3C. This charging is continued until the charging end point is reached (STEP 107 in FIG. 4). When the charging under the 3C condition reaches the charging end point, the remaining battery level SOC_3Cc, the battery temperature T_3Cc, and the well-known battery voltage V_3Cc at that time are stored (STEP 108 in FIG. 4).

  Subsequently, as shown in (5) of FIG. 5, charging at 2C is performed. This charging is continued until the charging end point is reached (STEP 109 in FIG. 4). When the charging under the 2C condition reaches the charging termination point, the remaining battery level SOC_2Cc, the battery temperature T_2Cc, and the battery voltage V_2Cc immediately before termination are stored (STEP 110 in FIG. 4).

Similarly, as shown in (6) of FIG. 5, charging at 1C is performed. This charging is continued until the charging end point is reached (STEP 111 in FIG. 4). When the charging under the 1C condition reaches the charging termination point, the remaining battery level SOC_1Cc, the battery temperature T_1Cc, and the battery voltage V_1Cc immediately before termination are stored (STEP 112 in FIG. 4). Then, as shown in (7) of FIG. 5, discharging is performed at 1C, and the state is returned to the remaining battery level to be waited for (STEP 113 of FIG. 4).
By the above procedure, data at the time of charging at 3C, 2C, 1C and at the time of discharging at 3C, 2C, 1C can be obtained.

(3) Results of Test Charge / Discharge Data obtained by the test charge / discharge as described above is stored in the storage unit 6 as a characteristic value table as shown in FIG. That is, in the test charging / discharging as shown in FIG. 5, the remaining battery level (SOC), the battery temperature T, and the battery voltage V at each current value are obtained. FIG. 6 shows an example of the characteristic value table. The vertical axis represents each current value, the horizontal axis represents the battery temperature T, and the charge end point (SOC) and discharge end point (SOC) at each current value and battery temperature. ). Below, the method is described.

  First, in charge / discharge for testing, it can be charged until the remaining battery level (SOC) reaches the battery temperature obtained for several current values, and the remaining battery level (SOC) is How much can be discharged, and the charging power (Ah) and discharging power (Ah) immediately before termination are required.

  However, each battery temperature obtained by the above charging / discharging is the temperature when actually performing charging / discharging for testing, and is generally an odd value (for example, 34.2 ° C.). On the other hand, the characteristic value table stores the remaining battery level (SOC) at a good temperature as shown in FIG. Therefore, in the characteristic value table, it is desirable to convert the relationship between the test charge / discharge temperature and the remaining battery level (SOC) into a well-separated temperature and remaining battery level (SOC). That is, it is preferable to create a table of remaining battery capacity (SOC) with respect to a temperature at which cutting is good, such as −20 ° C., −10 ° C., 0 ° C., 10 ° C., 20 ° C., as shown in FIG. Below, the method is explained in full detail.

  First, FIG. 6 data shows that the values in all the columns of the table are obtained by charging and discharging the above pattern at each specified temperature as standard characteristics of the same type of battery in advance as the BOL (Beginning of Life) data. Obtained and stored in the storage unit in the BMS 12 at the time of shipment.

Then, using the following (1) to (6) data obtained by performing pattern charge / discharge as shown in FIG. 5 in the actual use state, these newly acquired data are interpolated values by the characteristic value table. Review the characteristic value table so that
(1) 3C charging SOC_3Cc, T_3Cc, V_3Cc
(2) 2C charging SOC_2Cc, T_2Cc, V_2Cc
(3) 1C charging SOC_1Cc, T_1Cc, V_1Cc
(4) 1C discharge SOC_1Cd, T_1Cd, V_1Cd
(5) 2C discharge SOC_2Cd, T_2Cd, V_2Cd
(6) 3C discharge SOC_3Cd, T_3Cd, V_3Cd

  That is, the characteristic value table of FIG. 6 stored in advance is updated based on the current remaining battery level (SOC) of (1) to (6) obtained by test charging / discharging. At that time, the remaining battery level (SOC) data obtained by the test charge / discharge is interpolated. That is, the remaining battery level (SOC) data at a good temperature such as −20 ° C., −10 ° C., 0 ° C., 10 ° C., 20 ° C. It is updated by interpolating the remaining battery level (SOC). Thus, the characteristic data stored in the storage unit 6 in the BMS 12 at the time of shipment is updated and obtained as a characteristic value table of charging / discharging end points for new temperatures and current values.

(4) About the prediction method of chargeable / dischargeable capacity Next, the prediction method of the chargeable / dischargeable capacity using the table | surface of FIG. 6 is demonstrated. That is, in the present embodiment, the chargeable / dischargeable capacity is predicted from the temperature, current value, and current battery level (SOC) at an arbitrary time.

  First, as procedure 1, the charge / discharge end point (SOC) for a given temperature and current is interpolated from the table of FIG. Next, as a procedure 2, a chargeable / dischargeable remaining amount difference is obtained from the current remaining battery level (SOC) (which is always estimated by the BMS 12) and the end point obtained in the procedure 1. This difference in remaining amount is the chargeable / dischargeable capacity (Ah).

  That is, the charge / discharge end point or the discharge end point of the current temperature is obtained from FIG. Then, the difference between the current remaining battery level (SOC) and the remaining battery level (SOC) at the charge / discharge end point or the discharge end point is obtained. In other words, the difference between the current battery level (SOC) and the remaining battery level (SOC) at the end of charge / discharge is the chargeable capacity, and the remaining battery level (SOC) and the remaining battery level at the end of discharge The difference from (SOC) is the dischargeable capacity.

[1-3. effect]
In the charge / discharge amount prediction system according to the present embodiment, it is possible to predict the chargeable / dischargeable capacity with high accuracy. For example, the storage battery is expected while absorbing surplus generated photovoltaic power by charging the storage battery. It is possible to prevent an unexpected charge / discharge stop due to a problem such as reaching a full charge that does not occur, charging being stopped, and surplus power flowing into the power system and a voltage rise. This makes it possible to always manage the storage battery systematically and to stabilize the power system.

2. Second Embodiment The charge / discharge amount prediction system according to the second embodiment is obtained by changing the type of the charge / discharge starting reference battery remaining amount (SOC) table in the first embodiment. That is, as shown in FIG. 7, a table developed in advance for each temperature is prepared. In this table, the vertical axis represents the current value, and the horizontal axis represents the remaining battery level (SOC). It is a table | surface which calculates | requires chargeable / dischargeable capacity | capacitance from this electric current value and battery remaining charge (SOC).

  In the second embodiment, by using the table of FIG. 7, the specified temperature, the specified remaining battery level (SOC), and the chargeable / dischargeable capacity (Ah) for the specified current can be obtained by direct interpolation. As a result, the same effects as those of the first embodiment can be obtained, and at the same time, the processing load can be reduced.

3. Other Embodiments In the present specification, a plurality of embodiments according to the present invention have been described. However, these embodiments are presented as examples, and are intended to limit the scope of the invention. Absent. Specifically, the following modes can be considered.

(A) In the above-described first embodiment, constant current charge / discharge is used, but constant power charge / discharge may be used. In this case, as shown in FIG. 8, the information obtained by the test charge / discharge is the charge termination SOC and the discharge termination SOC for each battery temperature and each power value. In FIG. 8, it is the figure which showed the charge termination point or the discharge termination point by the electric current and temperature at the time of charging / discharging based on the charging / discharging for a test by constant power charging / discharging.

  FIG. 9 is a table of chargeable / dischargeable electric energy in constant power charge / discharge. As shown in FIG. 9, a table developed in advance for each temperature is prepared. In this table, the vertical axis represents the power value, and the horizontal axis represents the remaining battery level (SOC). It is a table | surface which calculates | requires chargeable / dischargeable capacity | capacitance from this electric power value and battery remaining charge (SOC).

  By using the table of FIG. 9, it is possible to obtain the designated temperature, the designated battery remaining amount (SOC), and the chargeable / dischargeable capacity (Ah) for the designated power by direct interpolation. Thereby, an effect similar to that of the second embodiment can be obtained.

(B) The chargeable / dischargeable time may be used instead of the chargeable / dischargeable capacity. In the case of constant current charge / discharge, the capacity and time can be converted to each other.

(C) Instead of obtaining the chargeable / dischargeable capacity and the chargeable / dischargeable time, it is also possible to obtain a current value or electric power value that can be charged / discharged for a specified time (for example, 30 minutes).

  That is, the reference battery remaining amount (SOC) at the end point under each constant current condition can be obtained from the table of chargeable / dischargeable current amounts in constant power charge / discharge. However, there is a possibility that the EMS (d) side wants to know the current and power that can be charged and discharged for a specified time.

In order to respond to the request, the maximum current value and the maximum power value that can be charged and discharged for a specified time are obtained by repeating the steps of FIG. 10 and the following (1) to (4).
(1) Current battery level (SOC) x (1 hour / specified time) = approximate C rate
(2) Find the end-of-discharge battery level (SOC) at that temperature at the determined C rate.
(3) Correct the current battery level (SOC) using the remaining battery level (SOC) obtained in (2).
(4) Repeat (1) using this

  That is, to obtain the maximum current value and the maximum power value that can be charged / discharged at 30 ° C. for 2 hours, first, according to (1), the approximate C rate is determined as 50% SOC × (1 hour / 2 hours) = 1 / 4C. . Next, the discharge end battery remaining amount (SOC) is set to -2% between 30 ° C and -1 / 3C and -1 / 5C. Then, 50% SOC of the current SOC is corrected by the termination SOC, so that 50% SOC → 52% SOC. Accordingly, the approximate C rate is determined as 52% SOC × (1 hour / 2 hours) = 0.26C.

(D) A pause time may be included while changing the current value in charge / discharge for testing. By ensuring the predetermined pause, the temperature increase of the battery cell can be reduced, and the influence of the temperature increase can be reduced. Further, the charging / discharging for the test can be performed by selecting a time zone or the like in which the necessity of charging / discharging the power storage device is relatively small.

(E) If the battery voltage data at the end of charge / discharge is also included in the characteristic value table, the charge / discharge power at the end of the charge can be predicted.

(F) From the viewpoint of preventing deterioration of the storage battery and / or from the viewpoint of securing a margin of the predicted value, step-down may be performed by charging / discharging up to the voltage immediately before it, instead of the charging / discharging end point.

(a) ... Power storage device
(b) Battery controller
(c) Information network
(d) ... EMS
DESCRIPTION OF SYMBOLS 11 ... Battery cell 12 ... Battery management system 2 ... Voltage measurement part 3 ... Current measurement part 4 ... Temperature measurement part 5 ... Control part 6 ... Memory | storage part 7 ... Communication interface

Claims (20)

In a charge / discharge amount prediction system comprising a power storage device, a power conditioner device, a power system, a battery controller, and an energy management device,
The battery controller includes a test charge / discharge test execution requesting unit that requests the energy management device to perform charge / discharge for testing at a constant cycle,
The energy management device includes a charge / discharge permission means for testing that permits charge / discharge for testing to the battery controller,
The power storage device includes: a secondary battery voltage measuring unit in the power storage device; a temperature measuring unit of the secondary battery; and charging / discharging for performing constant current charging and / or constant current discharging on the secondary battery at a predetermined current value. Means, data processing means, and data storage means,
Charging / discharging amount for performing the test charge / discharge when the request for the test charge / discharge of the test charge / discharge test is permitted by the test charge / discharge permission means Prediction system.   The charging / discharging for testing is performed with constant current charging or constant current discharging in order from the largest current value using a plurality of current values, and charging or discharging with the next largest current value after reaching the charging / discharging end condition. The charge / discharge amount prediction system according to claim 1, wherein the charge / discharge end point for the plurality of current values is obtained by repeating the operation.   The charge / discharge amount prediction system according to claim 2, wherein a chargeable / dischargeable current capacity with respect to the remaining amount, temperature, and current conditions of the secondary battery in the power storage device is predicted by the charge / discharge for the test. .   The charge / discharge amount prediction system according to claim 2, wherein a chargeable / dischargeable time with respect to the remaining amount, temperature, and current conditions of the secondary battery in the power storage device is predicted by the charge / discharge for the test.   The charge / discharge amount according to claim 2, wherein a chargeable / dischargeable current value with respect to conditions of a remaining amount, a temperature, and a charge / discharge time of the secondary battery in the power storage device is predicted by the charge / discharge for the test. Prediction system.   The charging / discharging for testing is performed with constant power charging or constant power discharging in order from the one with the largest power absolute value using a plurality of power values, and charging or discharging with the power value with the next largest absolute value after reaching the charging / discharging end condition. The charge / discharge amount prediction system according to claim 1, wherein the charge / discharge end point for the plurality of electric power values is obtained by repeating the operation.   The charge / discharge amount prediction system according to claim 6, wherein a chargeable / dischargeable power amount with respect to a remaining battery level, temperature, and power condition of the secondary battery in the power storage device is predicted by the test charge / discharge.   The charge / discharge amount prediction system according to claim 6, wherein a chargeable / dischargeable time with respect to a remaining battery level, temperature, and power condition of the secondary battery in the power storage device is predicted by the test charge / discharge.   The charge / discharge amount prediction according to claim 6, wherein a chargeable / dischargeable power value with respect to conditions of a remaining amount, a temperature, and a charge / discharge time of the secondary battery in the power storage device is predicted by the charge / discharge for the test. system.   The charge / discharge amount according to any one of claims 1 to 9, wherein the test charge / discharge is performed by selecting a time zone or the like in which the necessity of charge / discharge of the power storage device is relatively small. Prediction system. A power storage device, a power conditioner device, a power system, a battery controller, and an energy management device;
The battery controller performs an execution request step of a test charge / discharge test for requesting the energy management device to perform charge / discharge for the test at a constant cycle,
The energy management device performs a test charge / discharge permission step for permitting test charge / discharge to the battery controller,
The power storage device includes a voltage measurement step for a secondary battery in the power storage device, a temperature measurement step for the secondary battery, and charge / discharge for performing constant current charge and / or constant current discharge on the secondary battery at a predetermined current value. Performing a step, a data processing step, and a data storage step;
The charge / discharge amount prediction method, wherein the test charge / discharge is performed when the test charge / discharge execution request in the test charge / discharge test execution request step is permitted by the test charge / discharge permission step. .   The charging / discharging for testing is performed with constant current charging or constant current discharging in order from the largest current value using a plurality of current values, and charging or discharging with the next largest current value after reaching the charging / discharging end condition. The charging / discharging amount prediction method according to claim 11, wherein the charging / discharging end point with respect to the plurality of current values is obtained by repeating the step.   The charge / discharge amount prediction method according to claim 12, wherein a chargeable / dischargeable current capacity with respect to the remaining amount, temperature, and current conditions of the secondary battery in the power storage device is predicted by the charge / discharge for the test. .   The charge / discharge amount prediction method according to claim 12, wherein a chargeable / dischargeable time with respect to the remaining amount, temperature, and current conditions of the secondary battery in the power storage device is predicted by the test charge / discharge.   The charge / discharge amount according to claim 12, wherein a chargeable / dischargeable current value with respect to conditions of a remaining amount, a temperature, and a charge / discharge time of the secondary battery in the power storage device is predicted by the charge / discharge for the test. Prediction method.   The charging / discharging for testing is performed with constant power charging or constant power discharging in order from the one with the largest power absolute value using a plurality of power values, and charging or discharging with the power value with the next largest absolute value after reaching the charging / discharging end condition. The charging / discharging amount prediction method according to claim 11, wherein the charging / discharging end point with respect to the plurality of power values is obtained by repeating the operation.   The charge / discharge amount prediction method according to claim 16, wherein the charge / discharge amount for the remaining battery, temperature, and power conditions of the secondary battery in the power storage device is predicted by the test charge / discharge.   The charge / discharge amount prediction method according to claim 16, wherein a chargeable / dischargeable time with respect to conditions of the remaining amount, temperature, and power of the secondary battery in the power storage device is predicted by the charge / discharge for the test.   The charge / discharge amount prediction according to claim 16, wherein a chargeable / dischargeable power value with respect to conditions of a remaining amount, a temperature, and a charge / discharge time of the secondary battery in the power storage device is predicted by the charge / discharge for the test. Method.   The charging / discharging according to any one of claims 11 to 19, wherein the test charging / discharging is performed by selecting a time zone or the like in which the necessity of charging / discharging the power storage device is relatively small. Quantity prediction method.