Secondary battery management device, secondary battery management program, and secondary battery management method

Abstract

To provide a secondary battery, used for vehicle running, capable of easily achieving both of the durability of the secondary battery and the convenience of a vehicle.SOLUTION: A secondary battery management device includes: target setting section for setting a target charging rate which is a target of the charging rate of a secondary battery installed on a vehicle and a target charging rate arrival time which is a completion time of main charging for charging the secondary battery to a target charging rate at a main charging speed; a main charging setting section for setting a main charging start time of main charging start and a main charging speed on the basis of the output of a charger, the target charging rate and the target charging rate arrival time; at least either one of a discharge setting section for setting a discharging start time of a start of discharging from the secondary battery and a discharging speed of a speed of discharging and a sub charging setting section for setting a sub charging start time of a start of sub charging of charging the secondary battery at a sub charging speed and sub charging speed; and a charging and discharging execution section for executing main charging, discharging and sub charging according to the setting contents.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a secondary battery management device, a secondary battery management program, and a secondary battery management method.

Background Art

[0002] In recent years, the popularity of vehicles powered by a motor driven using electric power supplied from a secondary battery, such as electric vehicles (EVs), hybrid vehicles (HVs), and fuel cell vehicles (FCVs), has been increasing. The secondary batteries mounted on these vehicles self-discharge after being fully charged once and are not charged again. For this reason, the charge rate of the above-described secondary batteries continues to decrease, and there are cases where sufficient electric power cannot be supplied to the vehicle when the vehicle is used.

[0003] As a technology for solving such problems, for example, a power supply system disclosed in Patent Document 1 can be cited. The power supply system controls the charge and discharge power of the storage battery of the power storage unit provided outside the vehicle and the in-vehicle storage battery of the in-vehicle power storage device according to a charge and discharge schedule.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in order to suppress the deterioration of the in-vehicle battery due to a high charging rate and supply sufficient power to the vehicle when the vehicle is in use, the above-described power supply system may require the battery of the power storage unit provided outside the vehicle. For this reason, when the power supply system cannot use the battery of the power storage unit, it may not be possible to achieve both the durability of the in-vehicle battery and the convenience of the vehicle.

[0006] The present invention has been made in consideration of such circumstances, and one of its objectives is to provide a secondary battery management device, a secondary battery management program, and a secondary battery management method that can easily achieve both the durability of the secondary battery used for the purpose of running a vehicle and the convenience of the vehicle.

Means for Solving the Problems

[0007] The secondary battery management device, the secondary battery management program, and the secondary battery management method according to the present invention employ the following configurations.

[0008] (1): The secondary battery management device according to one aspect of the present invention includes a target setting unit that sets a target charging rate, which is the target of the charging rate of the secondary battery used for the purpose of running a vehicle, and a target charging rate arrival time, which is the time when the main charging for charging the secondary battery at the main charging speed until the target charging rate is completed; a main charging setting unit that sets a main charging start time, which is the time when the main charging is started based on the output of the charger that charges the secondary battery, the target charging rate, and the target charging rate arrival time, and the main charging speed; at least one of a discharge setting unit that sets a discharge start time, which is the time when the discharge from the secondary battery is started, and a discharge speed, which is the speed of the discharge, and a sub-charging setting unit that sets a sub-charging start time, which is the time when the sub-charging for charging the secondary battery at the sub-charging speed is started, and the sub-charging speed; and a charge and discharge execution unit that executes the main charging according to the content set by the main charging setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the sub-charging according to the content set by the sub-charging setting unit.

[0009] (2) In the secondary battery management device according to the aspect of (1) above, the auxiliary charging setting unit is configured to set the auxiliary charging to be executed before the main charging start time.

[0010] (3) In the secondary battery management device according to the aspect of (1) or (2) above, the discharge setting unit is configured to set the discharge to be executed before the main charging start time.

[0011] (4) In the secondary battery management device according to any one of (1) to (3) above, the discharge setting unit is configured to set the discharge to be executed after the main charging start time.

[0012] (5) The secondary battery management device according to any one of (1) to (4) above further includes a trend data acquisition unit that acquires trend data indicating a tendency of the vehicle to be used, and the main charging setting unit calculates a main chargeable power amount that is an amount of power with which the main charging of the secondary battery can be performed based on the trend data, sets the main charging start time and the main charging speed based on the main chargeable power amount, the auxiliary charging setting unit calculates an auxiliary chargeable power amount that is an amount of power with which the auxiliary charging of the secondary battery can be performed based on the trend data, and sets the auxiliary charging start time and the auxiliary charging speed based on the auxiliary chargeable power amount.

[0013] (6) In (5) above, the discharge setting unit calculates a dischargeable power amount that is an amount of power with which the discharge can be performed based on the main chargeable power amount and the auxiliary chargeable power amount, and sets the discharge start time and the discharge speed based on the dischargeable power amount.

[0014] (7) The secondary battery management device according to the above (5) or (6) is such that the tendency data acquisition unit acquires the tendency data indicating a first period which is a period when the vehicle does not run, a second period which is a period when the vehicle runs and follows the first period, and a third period which is a period when the vehicle does not run and follows the second period, the target setting unit sets the target charge rate arrival time to the end of the first period, and sets the target charge rate to a charge rate equal to or higher than the charge rate required to run the vehicle in the second period.

[0015] (8) The secondary battery management device according to the above (5) or (6) is such that the tendency data acquisition unit acquires the tendency data indicating a first period which is a period when the vehicle does not run, a second period which is a period when the vehicle runs and follows the first period, and a third period which is a period when the vehicle does not run and follows the second period, the target setting unit sets the target charge rate to a charge rate equal to or higher than a predetermined charge rate, and sets the target charge rate arrival time to the end of the third period.

[0016] (9) The secondary battery management device according to any one of the above (1) to (8) further includes a determination unit that determines whether or not there is a person in the vehicle interior, and when it is determined that there is a person in the vehicle interior, the discharge setting unit sets to prohibit the discharge.

[0017] (10) In the secondary battery management device according to the above (9), when the charge rate of the secondary battery exceeds a predetermined threshold value after the discharge is prohibited, the discharge setting unit releases the setting to prohibit the discharge of the secondary battery.

[0018] (11) In the secondary battery management device according to any one of the above (1) to (10), the discharge setting unit sets such that the power output from the secondary battery by the discharge is used for at least one of heating of the secondary battery, cooling of the secondary battery, air conditioning in the vehicle interior, and heating of the vehicle oil.

[0019] (12): In the secondary battery management device according to any one of (1) to (10) above, in the secondary battery, the electric power generated by the solar power generation panel is stored, and the main charge setting unit executes at least once a process of setting the main charge start time and the main charge rate based on the transition of the electric power generated by the solar power generation panel.

[0020] (13): In the secondary battery management device according to (12) above, the solar power generation panel is mounted on the vehicle.

[0021] (14): The secondary battery management program according to one aspect of the present invention includes a target setting function for setting a target charge rate that is the target of the charge rate of the secondary battery used for the purpose of running the vehicle, and a target charge rate arrival time that is the time when the main charge for charging the secondary battery at the main charge rate until the target charge rate is completed, a main charge setting function for setting a main charge start time that is the time when the main charge is started based on the output of the charger for charging the secondary battery, the target charge rate, and the target charge rate arrival time, and the main charge rate, a discharge setting function for setting a discharge start time that is the time when discharge from the secondary battery is started and a discharge rate that is the rate of the discharge, and a sub-charge setting function for setting a sub-charge start time that is the time when sub-charge for charging the secondary battery at the sub-charge rate is started and the sub-charge rate, and at least one of the charge and discharge execution functions for causing the computer to execute the main charge according to the content set by the main charge setting unit, execute the discharge according to the content set by the discharge setting unit, and execute the sub-charge according to the content set by the sub-charge setting unit.

[0022] (15) The secondary battery management method according to one aspect of the present invention sets a target charge rate which is the target of the charge rate of the secondary battery used for the purpose of running a vehicle, and a target charge rate arrival time which is the time when main charging to charge the secondary battery at a main charging speed up to the target charge rate is completed, sets a main charging start time which is the time when the main charging starts based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time, and the main charging speed, sets a discharge start time which is the time when discharge from the secondary battery starts and a discharge speed which is the speed of the discharge, and executes at least one of a process of setting a secondary charging start time which is the time when secondary charging to charge the secondary battery at a secondary charging speed starts and the secondary charging speed, and causes the main charging to be executed according to the content set by the main charging setting unit, causes the discharge to be executed according to the content set by the discharge setting unit, and causes the secondary charging to be executed according to the content set by the secondary charging setting unit.

Effect of the Invention

[0023] (1) to (13) According to this, the secondary battery management device uses in combination at least one of a process of executing discharge to decrease the charge rate of the secondary battery and a process of executing secondary charging to relatively gently increase the charge rate of the secondary battery, and a process of executing main charging to relatively quickly increase the charge rate of the secondary battery. Thereby, the secondary battery management device keeps the average of the charge rate from the earliest time among the main charging start time, the secondary charging start time, and the discharge start time to the target charge rate arrival time at a relatively low charge rate, and sets the charge rate of the secondary battery at the target charge rate arrival time as the target charge rate. Therefore, the secondary battery management device can set the charge rate of the secondary battery when the vehicle is used as a desired charge rate while suppressing deterioration of the secondary battery mounted on the vehicle.

[0024] According to (2), the secondary battery management device causes the secondary charge to be executed as preparation before executing the main charge. Thereby, the secondary battery management device can prepare to set the charge rate of the secondary battery at the target charge rate arrival time to the target charge rate while keeping the average of the charge rates from the secondary charge start time to the target charge rate arrival time at a relatively low charge rate.

[0025] According to (3), the secondary battery management device causes the secondary battery to be discharged before executing the main charge. Thereby, the secondary battery management device can prepare to set the charge rate of the secondary battery at the target charge rate arrival time to the target charge rate while keeping the average of the charge rates from the discharge start time to the target charge rate arrival time at a relatively low charge rate.

[0026] According to (4), the secondary battery management device discharges after the main charge start time. Thereby, the secondary battery management device can increase the charge rate of the secondary battery according to the period from the main charge start time to the target charge rate arrival time, and can set the charge rate of the secondary battery at the target charge rate arrival time to the target charge rate.

[0027] According to (5), the secondary battery management device sets the main charge start time, the main charge speed, the secondary charge start time, and the secondary charge speed based on the trend data indicating the trend of the vehicle to be used. Thereby, the secondary battery management device can execute the main charge and the secondary charge according to the trend of the vehicle to be used.

[0028] According to (6), the secondary battery management device sets the discharge start time and the discharge speed based on the dischargeable power amount calculated based on the main chargeable power amount and the secondary chargeable power amount. Thereby, the secondary battery management device can execute the discharge according to the trend of the vehicle to be used.

[0029] According to (7), the secondary battery management device sets the target charge rate arrival time to the end of the first period, and sets the target charge rate to a charge rate equal to or higher than the charge rate required for the vehicle to travel during the second period. Thereby, the secondary battery management device can make the secondary battery capable of supplying sufficient power to the vehicle when the vehicle is used during the second period.

[0030] According to (8), the secondary battery management device sets the target charge rate arrival time to the end of the third period. Thereby, when the second period between the first period and the third period, which is a period when the vehicle does not travel, is relatively short, the secondary battery management device executes the above-described process regardless of the second period, and the secondary battery can be in a state where it can supply sufficient power to the vehicle at the end of the third period.

[0031] According to (9), when it is determined that there is a person in the vehicle interior, the secondary battery management device is set to prohibit discharging. Thereby, the secondary battery management device can avoid the situation where a person in the vehicle interior cannot use in-vehicle devices that operate using the power of the secondary battery.

[0032] According to (10), even if there is a possibility that a person in the vehicle interior uses in-vehicle devices that operate using the power of the secondary battery, when the charge rate of the secondary battery is sufficiently high, the secondary battery management device appropriately executes discharging to reduce the charge rate of the secondary battery and can suppress deterioration of the secondary battery.

[0033] According to (11), the secondary battery management device is set such that the power output from the secondary battery by discharging is used for at least one of heating of the secondary battery, cooling of the secondary battery, air conditioning in the vehicle interior, and heating of the vehicle oil. Thereby, the secondary battery management device can effectively utilize the power output from the secondary battery by discharging.

[0034] (12) and (13) indicate that the secondary battery management device executes at least once the process of setting the main charging start time and the main charging speed based on the transition of the power generated by the solar power generation panel. Thereby, even if the power generated by the solar power generation panel may vary due to changes in weather or the like, the secondary battery management device can appropriately correct the main charging start time and the main charging speed based on the actual power generated by the solar power generation panel.

[0035] (14) indicates that the secondary battery management program combines at least one of the process of executing discharge to reduce the charging rate of the secondary battery and the process of executing auxiliary charging to relatively gently increase the charging rate of the secondary battery with the process of executing main charging to relatively quickly increase the charging rate of the secondary battery. Thereby, the secondary battery management program keeps the average of the charging rate from the earliest time among the main charging start time, the auxiliary charging start time, and the discharge start time to the target charging rate arrival time at a relatively low charging rate, and sets the charging rate of the secondary battery at the target charging rate arrival time as the target charging rate. Therefore, the secondary battery management program can suppress the deterioration of the secondary battery mounted on the vehicle and set the charging rate of the secondary battery when the vehicle is used as a desired charging rate.

[0036] (15) indicates that the secondary battery management method combines at least one of the process of executing discharge to reduce the charging rate of the secondary battery and the process of executing auxiliary charging to relatively gently increase the charging rate of the secondary battery with the process of executing main charging to relatively quickly increase the charging rate of the secondary battery. Thereby, the secondary battery management method keeps the average of the charging rate from the earliest time among the main charging start time, the auxiliary charging start time, and the discharge start time to the target charging rate arrival time at a relatively low charging rate, and sets the charging rate of the secondary battery at the target charging rate arrival time as the target charging rate. Therefore, the secondary battery management method can suppress the deterioration of the secondary battery mounted on the vehicle and set the charging rate of the secondary battery when the vehicle is used as a desired charging rate.

Brief Description of the Drawings

[0037]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0038] Hereinafter, embodiments of a secondary battery management device, a secondary battery management program, and a secondary battery management method according to the present invention will be described with reference to the drawings.

[0039] <Embodiment> First, the hardware configuration of the vehicle control device according to the embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram showing an example of the hardware configuration of a secondary battery management device according to the embodiment. The secondary battery management device 1 shown in FIG. 1 is, for example, an electronic control unit (ECU: Electronic Control Unit) mounted on a vehicle. The secondary battery management device 1 includes, for example, a processor 11, an input interface 12, an output interface 13, and a storage device 14 as shown in FIG. 1.

[0040] The processor 11 is, for example, a central processing unit (CPU), reads and executes a secondary battery management program described later, and realizes each function of the secondary battery management device 1. Further, the processor 11 may read and execute a program other than the secondary battery management program to realize each function of the vehicle.

[0041] The input interface 12 is an interface circuit for receiving data from an electronic control unit other than the secondary battery management device 1, sensors mounted on the vehicle, etc. The input interface 12 receives data transmitted via CAN (Controller Area Network), LIN (Local Interconnect Network), etc.

[0042] The output interface 13 is an interface circuit for transmitting data indicating the result calculated by the processor 11 based on the data received by the input interface 12. The output interface 13 transmits data transmitted via CAN, LIN, etc.

[0043] The storage device 14 is, for example, a RAM (Random Access Memory), and stores in advance a secondary battery management program and other programs read and executed by the processor 11. Further, the storage device 14 may have a storage area in which data indicating the result calculated by the processor 11 is stored.

[0044] Next, with reference to FIG. 2, the software configuration of the secondary battery management device according to the embodiment will be described. FIG. 2 is a diagram showing an example of the software configuration of the secondary battery management device according to the embodiment. The secondary battery management device 1 is mounted on a vehicle, for example, an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or a vehicle equipped with a solar power generation panel. As shown in FIG. 2, the secondary battery management device 1 includes a trend data acquisition unit 101, a target setting unit 102, a main charge setting unit 103, a sub charge setting unit 104, a discharge setting unit 105, a determination unit 106, and a charge / discharge execution unit 107.

[0045] At least a part of the functions provided in the secondary battery management device 1 is realized, for example, by a processor 11, which is hardware, executing a secondary battery management program, which is software. Also, at least a part of the functions provided in the secondary battery management device 1 may be realized by hardware (including a circuit part; circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by cooperation between software and hardware.

[0046] The trend data acquisition unit 101 acquires trend data. The trend data is data indicating the trend in which the vehicle is to be used. The trend data indicates trends such as the time zone in which the vehicle travels, the time zone in which the vehicle does not travel, and the location where the vehicle is located. Also, for example, the trend data may indicate these trends for each day of the week, each season, or each region.

[0047] The target setting unit 102 sets a target charge rate, which is the target charge rate of the secondary battery used for the purpose of driving the vehicle, and a target charge rate arrival time, which is the time when the main charge to charge the secondary battery to the target charge rate at the main charge speed is completed. The secondary battery mentioned here is, for example, a lithium ion battery.

[0048] Further, for example, the target charge rate is set based on at least one of the predicted distance that the vehicle is predicted to travel according to the trend data and the predicted time of using in-vehicle devices such as air conditioners and audio systems mounted on the vehicle. Alternatively, the target charge rate may be set based on the weather at the location where the vehicle is predicted to be located when the vehicle is equipped with a solar power generation panel that supplies power to the secondary battery. The target charge rate arrival time is set, for example, at the time when the vehicle shown by the trend data is predicted to start traveling.

[0049] The main charge setting unit 103 sets parameters related to the main charge for charging the secondary battery at a speed faster than the secondary charge. Specifically, the main charge setting unit 103 sets the main charge start time, which is the time when the main charge starts, and the main charge speed based on the output of the charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time. That is, the main charge setting unit 103 sets the main charge start time and the main charge speed so that the charge rate of the secondary battery reaches the target charge rate at the target charge rate arrival time within the output range of the charger. Further, the main charge is a charging method for charging the secondary battery at a relatively high speed. Therefore, the main charge setting unit 103 often sets the main charge start time and the main charge speed on the premise of increasing the output of the charger to a certain output or more.

[0050] Note that the main charge setting unit 103 may calculate the main chargeable power amount, which is the amount of power that can be used to perform the main charge on the secondary battery based on the trend data, and set the main charge start time and the main charge speed based on the main chargeable power amount. The main chargeable power amount is, for example, the amount of power calculated as the product of the time such as at night when the vehicle does not travel and the output of the charger in the case of a vehicle not equipped with a solar power generation panel that supplies power to the secondary battery. Alternatively, the main chargeable power amount is the amount of power obtained by subtracting the amount of power required to drive the vehicle to the destination from the amount of power that can be generated by the solar power generation panel during the day or the like in the case of a vehicle equipped with a solar power generation panel that supplies power to the secondary battery.

[0051] In addition, when the vehicle is equipped with a solar power generation panel that supplies power to the secondary battery, the main charge setting unit 103 may execute at least once a process of setting the main charge start time and the main charge speed based on the transition of the power generated by the solar power generation panel. This process is executed for the purpose of correcting the main charge start time and the main charge speed according to the actual situation when the power generated by the solar power generation panel changes due to changes in weather or the like.

[0052] The sub-charge setting unit 104 sets parameters related to sub-charge for charging the secondary battery at a speed slower than the main charge. Specifically, the sub-charge setting unit 104 sets the sub-charge start time, which is the time when sub-charge for charging the secondary battery at the sub-charge speed starts, and the sub-charge speed. Further, the sub-charge is a charging method for adjusting the charge rate of the secondary battery by charging the secondary battery at a relatively slow speed and preparing to reach the target charge rate at the target charge rate arrival time by the main charge. Therefore, the sub-charge setting unit 104 often sets the sub-charge start time and the sub-charge speed on the premise of suppressing the output of the charger to an output of a certain level or less. In addition, the sub-charge setting unit 104 may be set so that the sub-charge is executed before the main charge start time.

[0053] Note that the sub-charge setting unit 104 may calculate the sub-chargeable power amount, which is the power amount that can be sub-charged to the secondary battery based on the trend data, and set the sub-charge start time and the sub-charge speed based on the sub-chargeable power amount. The sub-chargeable power amount is, for example, when the vehicle is not equipped with a solar power generation panel that supplies power to the secondary battery, the power amount calculated as the product of the time such as at night when the vehicle does not run and the output of the charger. Alternatively, when the vehicle is equipped with a solar power generation panel that supplies power to the secondary battery, the sub-chargeable power amount is the power amount obtained by subtracting the power amount required to drive the vehicle to the destination from the power amount that can be generated by the solar power generation panel during the day or the like.

[0054] The discharge setting unit 105 sets parameters related to the discharge of the secondary battery. Discharge is an operation that causes the secondary battery to output power to adjust the charge rate of the secondary battery, and prepares to reach the target charge rate at the target charge rate arrival time by main charging. The discharge setting unit 105 sets the discharge start time, which is the time when discharge from the secondary battery starts, and the discharge rate, which is the speed of discharge. For example, the discharge setting unit 105 calculates the dischargeable power amount, which is the power amount that can be discharged based on the main chargeable power amount and the sub-chargeable power amount, and sets the discharge start time and the discharge rate based on the dischargeable power amount.

[0055] Also, the discharge setting unit 105 may be set to execute discharge before the main charge start time. Alternatively, the discharge setting unit 105 may be set to execute discharge after the main charge start time.

[0056] Note that the discharge setting unit 105 may be set so that the power output from the secondary battery by discharge is used for at least one of heating the secondary battery, cooling the secondary battery, air conditioning in the vehicle interior, and heating the vehicle oil.

[0057] The determination unit 106 determines whether there is a person in the vehicle interior. For example, the determination unit 106 uses a presence sensor mounted on the vehicle to determine whether there is a person in the vehicle interior. Examples of the presence sensor include a seating sensor attached to the vehicle seat. Alternatively, the determination unit 106 applies deep learning to a still image or a moving image captured by a camera mounted on the vehicle and capturing the vehicle interior to determine whether a human figure is depicted. Alternatively, the determination unit 106 determines whether there is a person in the vehicle interior by detecting whether a car navigation system, seat belt, etc. mounted on the vehicle have been operated.

[0058] Further, when it is determined by the determination unit 106 that there is a person in the vehicle interior, the discharge setting unit 105 may set to prohibit discharge. Further, when the charge rate of the secondary battery exceeds a predetermined threshold after discharge is prohibited, the discharge setting unit 105 may cancel the setting to prohibit discharge of the secondary battery.

[0059] The charge / discharge execution unit 107 causes the main charger connected to the vehicle by the charging cable to execute the main charge according to the content set by the main charge setting unit 103. Further, the charge / discharge execution unit 107 causes discharge to be executed according to the content set by the discharge setting unit 105. Further, the charge / discharge execution unit 107 causes the sub-charge to be executed by the charger connected to the vehicle by the charging cable according to the content set by the sub-charge setting unit 104.

[0060] Next, a first example of a schedule of the change over time of the charge rate of the secondary battery according to the embodiment will be described with reference to FIG. 3. FIG. 3 is a diagram showing an example of a schedule of the change over time of the charge rate of the secondary battery when the sub-charge is set to be executed before the start time of the main charge, and an example of a schedule of the change over time of the charge rate of the secondary battery according to the first comparative example. FIG. 3 shows an example in which the vehicle is used to return home at 18:00 in the evening, the vehicle is parked in the home parking lot from 18:00 to 6:00 the next day, and the vehicle is used to go to work at 6:00. Further, in FIG. 3, the horizontal axis represents time and the vertical axis represents the charge rate.

[0061] FIG. 3 shows an example of a schedule of the change over time of the charge rate of the secondary battery according to the first comparative example by a dotted line. As shown by the dotted line in FIG. 3, the secondary battery management device according to the first comparative example executes charging until after 0:00 and then stops charging, and allows self-discharge of the secondary battery until 6:00.

[0062] On the other hand, FIG. 3 shows an example of a schedule of the change over time of the charge rate of the secondary battery when the sub-charge is set to be executed before the start time of the main charge by a solid line. Further, the solid line shown in FIG. 3 is composed of a point P31, a point P32, a point P33, a line segment L312, and a line segment L323.

[0063] The horizontal axis coordinate of point P31 indicates 6:00, which is an example of the time when the target charging rate is reached. The vertical axis coordinate of point P31 indicates 95%, which is an example of the target charging rate. The coordinates of point P31 are set by the target setting unit 102.

[0064] The horizontal axis coordinate of point P32 indicates the main charging start time. The vertical axis coordinate of point P32 indicates the charging rate of the secondary battery at the main charging start time when the secondary charging is completed. One end of the line segment L312 coincides with point P31, and the other end coincides with point P32. Also, the slope of the line segment L312 indicates the main charging speed. The horizontal axis coordinate of point P33 indicates 18:00, which is an example of the secondary charging start time. The vertical axis coordinate of point P33 indicates the charging rate of the secondary battery when the vehicle has finished traveling.

[0065] One end of the line segment L323 coincides with point P32, and the other end coincides with point P33. Also, the slope of the line segment L323 indicates the secondary charging speed. Therefore, the coordinates of point P32 are determined by the target charging rate arrival time and the target charging rate set by the target setting unit 102, the main charging start time and the main charging speed set by the main charging setting unit 103, the secondary charging start time set by the secondary charging setting unit 104, and the charging rate of the secondary battery when the vehicle has finished traveling. Note that the line segment L333 shows an example of the change over time of the charging rate of the secondary battery while the vehicle is traveling.

[0066] In this case, the charge and discharge execution unit 107 causes the charger to execute secondary charging as shown by the line segment L323 in FIG. 3, and causes the charger to execute main charging as shown by the line segment L312 in FIG. 3. Thereby, the charge and discharge execution unit 107 can make the average value of the charging rate of the secondary battery from 18:00 to 6:00 the next day lower than that of the secondary battery management device according to the first comparative example.

[0067] Next, with reference to FIG. 4, a second example of the schedule of the change over time of the charge rate of the secondary battery according to the embodiment will be described. FIG. 4 is a diagram showing an example of the schedule of the change over time of the charge rate of the secondary battery when discharging is set to be executed before the main charge start time and an example of the schedule of the change over time of the charge rate of the secondary battery according to the second comparative example. FIG. 4 shows an example in which the vehicle is parked in the home parking lot from before 18:00 on a holiday until 6:00 the next day, and the vehicle is used to go to work at 6:00. Further, in FIG. 4, the horizontal axis represents time, and the vertical axis represents the charge rate.

[0068] FIG. 4 shows an example of the schedule of the change over time of the charge rate of the secondary battery according to the second comparative example with a dotted line. As shown by the dotted line in FIG. 4, the secondary battery management device according to the second comparative example allows self-discharge of the secondary battery from before 18:00 until 6:00.

[0069] On the other hand, FIG. 4 shows an example of the schedule of the change over time of the charge rate of the secondary battery when discharging is set to be executed before the main charge start time with a solid line. Also, the solid line shown in FIG. 4 is composed of point P41, point P42, point P43, line segment L412, and line segment L423.

[0070] The horizontal axis coordinate of point P41 indicates 6:00, which is an example of the target charge rate arrival time. The vertical axis coordinate of point P41 indicates 95%, which is an example of the target charge rate. The coordinates of point P41 are set by the target setting unit 102.

[0071] The horizontal axis coordinate of point P42 indicates the main charge start time. The vertical axis coordinate of point P42 indicates the charge rate of the secondary battery at the main charge start time when the discharge is completed. One end of line segment L412 coincides with point P41, and the other end coincides with point P42. Also, the slope of line segment L412 indicates the main charge speed. The horizontal axis coordinate of point P43 indicates 18:00, which is an example of the discharge start time. The vertical axis coordinate of point P43 indicates the charge rate of the secondary battery at the discharge start time.

[0072] The line segment L423 has one end coinciding with point P42 and the other end coinciding with point P43. Also, the slope of the line segment L423 indicates the discharge rate. Therefore, the coordinates of point P42 are determined by the target charge rate arrival time and target charge rate set by the target setting unit 102, the main charge start time and main charge rate set by the main charge setting unit 103, the discharge start time set by the discharge setting unit 105, and the charge rate of the secondary battery at the discharge start time. Note that the line segment L433 shows an example of the change over time of the charge rate due to self-discharge of the secondary battery while the vehicle is stopped.

[0073] In this case, the charge and discharge execution unit 107 causes the charger to execute discharge as shown by the line segment L423 in FIG. 4, and causes the charger to execute main charge as shown by the line segment L412 in FIG. 4. Thereby, the charge and discharge execution unit 107 can make the average value of the charge rate of the secondary battery between 18:00 and 6:00 the next day lower than that of the secondary battery management device according to the second comparative example.

[0074] Next, a third example of the schedule of the change over time of the charge rate of the secondary battery according to the embodiment will be described with reference to FIG. 5. FIG. 5 is a diagram showing an example of the schedule of the change over time of the charge rate of the secondary battery when it is set that discharge is executed after the main charge start time. The vehicle according to the third example shown in FIG. 5 is a vehicle equipped with a solar power generation panel that supplies power to the secondary battery.

[0075] FIG. 5 shows an example of a case where the vehicle is used to go to work at 6:00, the vehicle is parked from 6:00 to around 17:00, and the vehicle is used to leave work at 17:30. Also, in FIG. 5, the horizontal axis represents time and the vertical axis represents the charge rate. Further, in FIG. 5, the increase in the charge rate due to the main charge is shown by a triangle with diagonal hatching, and the decrease in the charge rate due to the discharge is shown by a triangle with dot hatching. Also, the solid line shown in FIG. 5 is composed of point P51, point P52, point P53, point P54, line segment L512, line segment L523, line segment L534, and line segment L544, and shows the virtual transition of the secondary battery when it is assumed that the main charge is executed after the discharge.

[0076] The horizontal axis coordinate of point P51 indicates 17:30, which is an example of the time when the target charge rate is reached. The vertical axis coordinate of point P51 indicates 95%, which is an example of the target charge rate. The coordinates of point P51 are set by the target setting unit 102.

[0077] The horizontal axis coordinate of point P54 indicates 6:00, which is an example of the main charge start time and the discharge start time. The vertical axis coordinate of point P54 indicates the charge rate of the secondary battery at the main charge start time and the discharge start time. Also, as shown by the triangle with diagonal hatching in FIG. 5, the main charge starts at 6:00. On the other hand, as shown by the triangle with dot hatching in FIG. 5, the discharge starts at 6:00. And assuming that the main charge is executed after the discharge, the charge rate of the secondary battery changes as shown by the solid line in FIG. 5.

[0078] The horizontal axis coordinate of point P52 indicates the virtual main charge start time. The vertical axis coordinate of point P52 indicates the charge rate of the secondary battery at the virtual main charge start time. The line segment L512 has one end coinciding with point P51 and the other end coinciding with point P52. Also, the slope of the line segment L512 indicates the virtual main charge rate. The horizontal axis coordinate of point P53 indicates an example of the virtual discharge start time. The vertical axis coordinate of point P53 indicates the charge rate of the secondary battery at the virtual discharge start time.

[0079] The line segment L523 has one end coinciding with point P52 and the other end coinciding with point P53. Also, the slope of the line segment L523 indicates the discharge rate of the discharge due to the self-discharge of the secondary battery. Therefore, the coordinates of point P52 are determined by the target charge rate reach time and the target charge rate set by the target setting unit 102, the virtual main charge start time and the main charge rate set by the main charge setting unit 103, the virtual discharge start time set by the discharge setting unit 105, and the charge rate of the secondary battery at the virtual discharge start time.

[0080] Note that the line segment L534 shows an example of the change over time of the charge rate due to the discharge of the secondary battery for the vehicle to travel. Further, the line segment L544 shows an example of the change over time of the charge rate due to the self-discharge of the secondary battery while the vehicle is stopped.

[0081] Next, with reference to FIG. 6, the processing executed by the second ground fault determination unit according to the embodiment will be described. FIG. 6 is a flowchart showing an example of the processing executed by the secondary battery management device according to the embodiment.

[0082] In step S10, the trend data acquisition unit 101 acquires trend data indicating the trend of how the vehicle is to be used.

[0083] In step S20, the target setting unit 102 sets a target charge rate, which is the target of the charge rate of the secondary battery used for the purpose of running the vehicle, and a target charge rate arrival time, which is the time when the main charge for charging the secondary battery to the target charge rate at the main charge speed is completed.

[0084] In step S30, the main charge setting unit 103 sets a main charge start time, which is the time when the main charge starts, and a main charge speed based on the output of the charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time.

[0085] In step S40, the auxiliary charge setting unit 104 sets an auxiliary charge start time, which is the time when the auxiliary charge for charging the secondary battery at the auxiliary charge speed starts, and an auxiliary charge speed.

[0086] In step S50, the discharge setting unit 105 sets a discharge start time, which is the time when the discharge from the secondary battery starts, and a discharge speed, which is the speed of the discharge.

[0087] In step S60, the charge / discharge execution unit 107 executes the main charge according to the content set by the main charge setting unit 103, executes the discharge according to the content set by the discharge setting unit 105, and executes the auxiliary charge according to the content set by the auxiliary charge setting unit 104.

[0088] The vehicle and the secondary battery management device 1 according to the embodiment have been described above. The secondary battery management device 1 includes a target setting unit 102, a main charging setting unit 103, at least one of a discharge setting unit 105 and a secondary charging setting unit 104, and a charge / discharge execution unit 107.

[0089] The target setting unit 102 sets a target charge rate, which is the target charge rate of the secondary battery used for the purpose of running the vehicle, and a target charge rate arrival time, which is the time when the main charging to charge the secondary battery to the target charge rate at the main charging speed is completed. The main charging setting unit 103 sets a main charging start time, which is the time when the main charging is started, and a main charging speed based on the output of the charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time.

[0090] The discharge setting unit 105 sets a discharge start time, which is the time when the discharge from the secondary battery is started, and a discharge speed, which is the speed of the discharge. The secondary charging setting unit 104 sets a secondary charging start time, which is the time when the secondary charging to charge the secondary battery at the secondary charging speed is started, and a secondary charging speed. The charge / discharge execution unit 107 executes the main charging according to the content set by the main charging setting unit 103, executes the discharge according to the content set by the discharge setting unit 105, and executes the secondary charging according to the content set by the secondary charging setting unit 104.

[0091] That is, the secondary battery management device 1 combines at least one of the process of executing discharge to reduce the charge rate of the secondary battery and the process of executing secondary charging to relatively gently increase the charge rate of the secondary battery, and the process of executing main charging to relatively quickly increase the charge rate of the secondary battery.

[0092] As a result, the secondary battery management device 1 keeps the average of the charging rate from the earliest time among the main charging start time, the sub-charging start time, and the discharging start time to the target charging rate arrival time at a relatively low charging rate, and sets the charging rate of the secondary battery at the target charging rate arrival time to the target charging rate. Therefore, the secondary battery management device 1 can suppress the deterioration of the secondary battery mounted on the vehicle and set the charging rate of the secondary battery when the vehicle is used to the desired charging rate.

[0093] In addition, the secondary battery management device 1 is set so that sub-charging is executed before the main charging start time. As a result, the secondary battery management device 1 can keep the average of the charging rate from the sub-charging start time to the target charging rate arrival time at a relatively low charging rate, and can prepare to set the charging rate of the secondary battery at the target charging rate arrival time to the target charging rate.

[0094] In addition, the secondary battery management device 1 is set so that discharging is executed before the main charging start time. As a result, the secondary battery management device 1 can keep the average of the charging rate from the discharging start time to the target charging rate arrival time at a relatively low charging rate, and can prepare to set the charging rate of the secondary battery at the target charging rate arrival time to the target charging rate.

[0095] In addition, the secondary battery management device 1 is set so that discharging is executed after the main charging start time. As a result, the secondary battery management device 1 can increase the charging rate of the secondary battery according to the period from the main charging start time to the target charging rate arrival time, and can set the charging rate of the secondary battery at the target charging rate arrival time to the target charging rate.

[0096] In addition, the secondary battery management device 1 calculates the main chargeable power amount, which is the amount of power with which the secondary battery can be mainly charged, based on the trend data, and sets the main charging start time and the main charging speed based on the main chargeable power amount. Further, the secondary battery management device 1 calculates the sub-chargeable power amount, which is the amount of power with which the secondary battery can be sub-charged, based on the trend data, and sets the sub-charging start time and the sub-charging speed based on the sub-chargeable power amount.

[0097] As a result, the secondary battery management device 1 sets the main charging start time, the main charging speed, the auxiliary charging start time, and the auxiliary charging speed based on the trend data indicating the trend of vehicle usage. Thereby, the secondary battery management device 1 can perform main charging and auxiliary charging according to the trend of vehicle usage.

[0098] In addition, the secondary battery management device 1 calculates the dischargeable power amount, which is the power amount that can be discharged based on the main chargeable power amount and the auxiliary chargeable power amount, and sets the discharge start time and the discharge speed based on the dischargeable power amount. Thereby, the secondary battery management device 1 can perform discharge according to the trend of vehicle usage.

[0099] In addition, when it is determined that there is a person in the vehicle interior, the secondary battery management device 1 is set to prohibit discharge. Thereby, the secondary battery management device 1 can avoid the situation where a person in the vehicle interior cannot use in-vehicle devices that operate using the power of the secondary battery.

[0100] In addition, when the charging rate of the secondary battery exceeds a predetermined threshold after discharge is prohibited, the secondary battery management device 1 releases the setting to prohibit discharge of the secondary battery. Thereby, even if there is a possibility that a person in the vehicle interior may use in-vehicle devices that operate using the power of the secondary battery, when the charging rate of the secondary battery is sufficiently high, the secondary battery management device 1 appropriately executes discharge to reduce the charging rate of the secondary battery and suppress deterioration of the secondary battery.

[0101] In addition, the secondary battery management device 1 is set such that the power output from the secondary battery by discharge is used for at least one of heating the secondary battery, cooling the secondary battery, air conditioning in the vehicle interior, and heating the vehicle oil. Thereby, the secondary battery management device 1 can effectively utilize the power output from the secondary battery by discharge.

[0102] Further, when the power generated by the solar power generation panel is stored in the secondary battery, the secondary battery management device 1 executes at least once a process of setting the main charging start time and the main charging speed based on the transition of the power generated by the solar power generation panel. Thereby, even if the power generated by the solar power generation panel may vary due to changes in weather or the like, the secondary battery management device 1 can appropriately correct the main charging start time and the main charging speed based on the actual results of the power generated by the solar power generation panel.

[0103] Note that the tendency data acquisition unit 101 may acquire tendency data indicating a first period during which the vehicle does not run, a second period during which the vehicle runs and which follows the first period, and a third period during which the vehicle does not run and which follows the second period. In this case, the target setting unit 102 sets the target charge rate arrival time to the end of the first period, and sets the target charge rate to a charge rate equal to or higher than the charge rate required to run the vehicle during the second period. Thereby, the secondary battery management device 1 can bring the secondary battery into a state where it can supply sufficient power to the vehicle when the vehicle is used during the second period.

[0104] Further, the tendency data acquisition unit 101 may acquire tendency data indicating a first period during which the vehicle does not run, a second period during which the vehicle runs and which follows the first period, and a third period during which the vehicle does not run and which follows the second period. In this case, thereby, when the second period between the first period and the third period during which the vehicle does not run is relatively short, the secondary battery management device 1 executes the above-described process regardless of the second period, and the secondary battery can supply sufficient power to the vehicle at the end of the third period.

[0105] As described above, the embodiments of the present invention have been described with reference to the drawings. However, the secondary battery management device, the secondary battery management program, and the secondary battery management method are not limited to the above-described embodiments, and at least one of various modifications, substitutions, combinations, and design changes can be added without departing from the gist of the present invention.

[0106] Moreover, the effects of the embodiments of the present invention described above are the effects described as an example. Therefore, the embodiments of the present invention may exhibit other effects that can be recognized by those skilled in the art from the description of the above-described embodiments in addition to the above-described effects.

Description of Reference Numerals

[0107] 1... Secondary battery management device, 11... Processor, 12... Input interface, 13... Output interface, 14... Storage device, 101... Trend data acquisition unit, 102... Target setting unit, 103... Main charge setting unit, 104... Sub charge setting unit, 105... Discharge setting unit, 106... Determination unit, 107... Charge / discharge execution unit

Claims

1. A target setting unit that sets a target charge rate, which is the target of the charge rate of a secondary battery used for the purpose of running a vehicle, and a target charge rate arrival time, which is the time when main charging to charge the secondary battery at a main charging speed until the target charge rate is completed; A main charge setting unit that sets a main charge start time, which is the time when the main charge starts, and the main charge speed based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time; A discharge setting unit that sets a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge speed, and a sub-charge start time, which is the time when sub-charging to charge the secondary battery at a sub-charge speed starts, and a sub-charge setting unit that sets the sub-charge speed; A charge and discharge execution unit that executes the main charge according to the content set by the main charge setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the sub-charge according to the content set by the sub-charge setting unit; Comprising: The discharge setting unit is set so that the discharge is executed after the main charge start time. A secondary battery management device.

2. A target setting unit that sets a target charge rate, which is the target of the charge rate of a secondary battery used for the purpose of running a vehicle, and a target charge rate arrival time, which is the time when main charging to charge the secondary battery at a main charging speed until the target charge rate is completed; A main charge setting unit that sets a main charge start time, which is the time when the main charge starts, and the main charge speed based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time; At least one of a discharge setting unit that sets a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge speed, and a sub-charge start time, which is the time when sub-charging to charge the secondary battery at a sub-charge speed starts, and a sub-charge setting unit that sets the sub-charge speed; A charge and discharge execution unit that executes the main charge according to the content set by the main charge setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the sub-charge according to the content set by the sub-charge setting unit; A trend data acquisition unit that acquires trend data indicating a trend in which the vehicle is to be used. The main charge setting unit calculates a main chargeable power amount, which is the power amount with which the secondary battery can be main-charged based on the tendency data, and sets the main charge start time and the main charge speed based on the main chargeable power amount. The sub-charge setting unit calculates a sub-chargeable power amount, which is the power amount with which the secondary battery can be sub-charged based on the tendency data, and sets the sub-charge start time and the sub-charge speed based on the sub-chargeable power amount. Secondary battery management device.

3. The discharge setting unit calculates a dischargeable power amount, which is the power amount with which the discharge can be performed based on the main chargeable power amount and the sub-chargeable power amount, and sets the discharge start time and the discharge speed based on the dischargeable power amount. The secondary battery management device according to claim 2.

4. The tendency data acquisition unit acquires the tendency data indicating a first period, which is a period during which the vehicle does not run, a second period, which is a period during which the vehicle runs and follows the first period, and a third period, which is a period during which the vehicle does not run and follows the second period. The target setting unit sets the target charge rate arrival time to the end of the first period, and sets the target charge rate to a charge rate equal to or higher than the charge rate required to run the vehicle during the second period. The secondary battery management device according to claim 2 or claim 3.

5. The tendency data acquisition unit acquires the tendency data indicating a first period, which is a period during which the vehicle does not run, a second period, which is a period during which the vehicle runs and follows the first period, and a third period, which is a period during which the vehicle does not run and follows the second period. The target setting unit sets the target charge rate to a charge rate equal to or higher than a predetermined charge rate, and sets the target charge rate arrival time to the end of the third period. The secondary battery management device according to claim 2 or claim 3.

6. A target setting unit that sets a target charge rate, which is a target for the charge rate of a secondary battery used for the purpose of running a vehicle, and a target charge rate arrival time, which is the time when main charging is completed at the main charge speed until the secondary battery reaches the target charge rate. A main charge setting unit that sets a main charge start time, which is the time when the main charge is started, and the main charge speed based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time. A discharge setting unit that sets a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge rate, which is the rate of the discharge, and at least one of a secondary charge setting unit that sets a secondary charge start time, which is the time when secondary charging that charges the secondary battery at a secondary charging rate starts, and the secondary charging rate A charge and discharge execution unit that executes the main charge according to the content set by the main charge setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the secondary charge according to the content set by the secondary charge setting unit A determination unit that determines whether or not there is a person in the vehicle interior When it is determined that there is a person in the vehicle interior, the discharge setting unit sets to prohibit the discharge Secondary battery management device

7. When the charge rate of the secondary battery exceeds a predetermined threshold after the discharge is prohibited, the discharge setting unit cancels the setting to prohibit the discharge of the secondary battery The secondary battery management device according to claim 6

8. A target setting unit that sets a target charge rate, which is a target of the charge rate of a secondary battery used for the purpose of driving a vehicle, and a target charge rate arrival time, which is the time when main charging that charges the secondary battery at a main charging rate until the target charge rate is completed A main charge setting unit that sets a main charge start time, which is the time when the main charge starts, and the main charge rate based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time A discharge setting unit that sets a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge rate, which is the rate of the discharge, and a secondary charge setting unit that sets a secondary charge start time, which is the time when secondary charging that charges the secondary battery at a secondary charging rate starts, and the secondary charging rate A charge and discharge execution unit that executes the main charge according to the content set by the main charge setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the secondary charge according to the content set by the secondary charge setting unit The discharge setting unit sets so that the power output from the secondary battery by the discharge is used for at least one of heating of the secondary battery, cooling of the secondary battery, air conditioning in the vehicle interior, and heating of the vehicle oil Secondary battery management device

9. A target setting unit that sets a target charge rate that is the target of the charge rate of a secondary battery used for the purpose of driving a vehicle, and a target charge rate arrival time that is the time when main charging for charging the secondary battery at a main charging speed until the target charge rate is completed; A main charge setting unit that sets a main charge start time that is the time when the main charge is started based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time, and the main charge speed; At least one of a discharge setting unit that sets a discharge start time that is the time when discharge from the secondary battery is started and a discharge speed that is the speed of the discharge, and a sub-charge setting unit that sets a sub-charge start time that is the time when sub-charging for charging the secondary battery at a sub-charging speed is started, and the sub-charge speed; A charge / discharge execution unit that executes the main charge according to the content set by the main charge setting unit, executes the discharge according to the content set by the discharge setting unit, and executes the sub-charge according to the content set by the sub-charge setting unit; The secondary battery stores electric power generated by a solar power generation panel; The main charge setting unit executes at least once a process of setting the main charge start time and the main charge speed based on the transition of the electric power generated by the solar power generation panel; Secondary battery management device.

10. The solar power generation panel is mounted on the vehicle; The secondary battery management device according to claim 9.

11. The sub-charge setting unit is set so that the sub-charge is executed before the main charge start time; The secondary battery management device according to any one of claims 1 to 10.

12. The discharge setting unit is set so that the discharge is executed before the main charge start time; The secondary battery management device according to any one of claims 1 to 11.

13. A target setting function that sets a target charge rate that is the target of the charge rate of a secondary battery used for the purpose of driving a vehicle, and a target charge rate arrival time that is the time when main charging for charging the secondary battery at a main charging speed until the target charge rate is completed; A main charge setting function that sets a main charge start time that is the time when the main charge is started based on the output of a charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time, and the main charge speed; A discharge setting function for setting a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge rate, which is the rate of the discharge, so that the discharge is executed after the main charge start time, and a secondary charge start time, which is the time when secondary charging for charging the secondary battery at a secondary charge rate starts, and a secondary charge setting function for setting the secondary charge rate A charge / discharge execution function for executing the main charge according to the content set by the main charge setting function, executing the discharge according to the content set by the discharge setting function, and executing the secondary charge according to the content set by the secondary charge setting function A secondary battery management program that causes a computer to execute

14. Setting a target charge rate, which is the target charge rate of the secondary battery used for the purpose of driving the vehicle, and a target charge rate arrival time, which is the time when the main charge for charging the secondary battery at the main charge rate until the target charge rate is completed Based on the output of the charger that charges the secondary battery, the target charge rate, and the target charge rate arrival time, setting a main charge start time, which is the time when the main charge starts, and the main charge rate Performing a process of setting a discharge start time, which is the time when discharge from the secondary battery starts, and a discharge rate, which is the rate of the discharge, so that the discharge is executed after the main charge start time, and a process of setting a secondary charge start time, which is the time when secondary charging for charging the secondary battery at a secondary charge rate starts, and the secondary charge rate Executing the main charge according to the set content, executing the discharge according to the set content, and executing the secondary charge according to the set content A secondary battery management method

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