JP2020094868A - Full charge capacity learning device - Google Patents

Abstract

To secure the frequency at which full charge capacity is learned while suppressing a reduction in battery performance.SOLUTION: For the case where external charging is executed between a set charging start time and a set charging end time, when the number of times learning of full charge capacity has failed exceeds a prescribed value, a time of day preceding the charging end time by a duration of time equal to the sum of a wait time for preparing for external charging, a required charge time needed for executing external charging and a depolarization time required for the depolarization of a secondary battery after external charging is terminated, is set as the charging start time, and external charging is begun when the wait time has elapsed from the charging start time, with full charge capacity learned after the charging end time has elapsed.SELECTED DRAWING: Figure 2

Description

The present invention relates to a full charge capacity learning device, and more particularly, to a full charge capacity learning device that learns the full charge capacity of an externally rechargeable secondary battery that is charged with electric power from an external power source.

Conventionally, as this type of full-charge capacity learning device, there has been proposed a device that estimates the full-charge capacity of a secondary battery (battery pack) that can be externally charged by charging with electric power from an external power source (for example, patent Reference 1). In this device, the full charge capacity of the secondary battery is learned for each charge based on the difference in the storage ratio (SOC) before and after charging and the integrated value of the charging current during charging. The difference in storage ratio before and after charging is calculated using the open circuit voltage (OCV) of the secondary battery.

JP, 2013-101072, A

In the above-described full-charge capacity learning device, if the open-circuit voltage is acquired while the polarization of the secondary battery remains, the open-circuit voltage cannot be acquired accurately due to the polarization, so that the full-charge capacity can be learned accurately. Can not. As a method for accurately learning the full charge capacity, after charging/discharging the secondary battery, leave the secondary battery without charging/discharging for a sufficient time to eliminate the polarization, and then eliminate the polarization. After that, a method of learning the full charge capacity can be considered. However, it takes about several hours to eliminate the polarization, so after the external charging is completed, the secondary battery is left for a relatively long time with a relatively high charge rate, and the secondary battery deteriorates. Performance will decrease. Further, in the case of setting the time to end charging and starting the use of the secondary battery immediately after the end of charging, it is not possible to secure the time to eliminate polarization after the end of charging, so it is possible to learn the full charge capacity. This is not possible, and the frequency of learning the full charge capacity will decrease.

The full-charge-capacity learning device of the present invention mainly aims to secure the frequency of learning the full-charge capacity while suppressing a decrease in battery performance.

The full-charge capacity learning device of the present invention employs the following means in order to achieve the main object described above.

The first full charge capacity learning device of the present invention is
A full-charge-capacity learning device that learns the full-charge capacity of a secondary battery that can be externally charged by charging with electric power from an external power source.
When performing the external charging between the set charging start time and the set charging end time, when the number of times the learning of the full charge capacity has failed exceeds a predetermined value, the preparation for the external charging is performed. Standby time for charging, the charging time required to execute the external charging, and the polarization elimination time required to eliminate the polarization of the secondary battery after the external charging is finished, and the charging end time. Set a time earlier than the charging start time, start the external charging when the standby time has elapsed from the charging start time,
Learning the full charge capacity after the charging end time has passed,
That is the summary.

In the first full-charge capacity learning device of the present invention, when the external charging is performed between the set charging start time and the set charging end time, the number of times the learning of the full-charge capacity fails is predetermined. When the value exceeds the value, the standby time for preparation for external charging, the charging time required for executing external charging, and the polarization elimination time required for eliminating polarization of the secondary battery after completion of external charging, The time before the charging end time of the sum time is set as the charging start time, external charging is started when the standby time has elapsed from the charging start time, and the full charge capacity is learned after the charging end time has elapsed. Therefore, since the full charge capacity can be learned after the polarization of the secondary battery is eliminated, the full charge capacity can be learned with high accuracy, and the learning frequency of the charge capacity can be secured. After external charging is completed, the secondary battery is left uncharged and discharged during the polarization elimination time.However, depending on the outside temperature, if external charging is completed and a secondary battery with a high storage rate is left alone, The secondary battery deteriorates and the performance deteriorates. In view of this, when the number of times the learning of the full charge capacity has failed exceeds a predetermined value, the time before the charging end time is charged by the sum of the standby time, the required charging time and the polarization elimination time. By setting it as the start time, regardless of the number of times the learning of the full charge capacity has failed, the time before the charge end time is set as the charge start time by the sum of the standby time, the required charging time and the polarization elimination time. It is possible to suppress the deterioration of the performance of the secondary battery as compared with the above. As a result, the frequency of learning the full charge capacity can be secured while suppressing the deterioration of the battery performance.

In the first full-charge capacity learning device of the present invention, the polarization elimination time may be calculated using the temperature of the secondary battery and the outside air temperature.

The second full charge capacity learning device of the present invention is
A full-charge-capacity learning device that learns the full-charge capacity of a secondary battery that can be externally charged by charging with electric power from an external power source.
In the case of executing the external charging between the set charging start time and the set charging end time, when the elapsed time from the previous learning of the full charge capacity exceeds a predetermined time, Standby time for preparation for external charging, charging time required to execute the external charging, polarization elimination time required to eliminate polarization of the secondary battery after the external charging is finished, and a sum of time The time before the charging end time is set as the charging start time, and the external charging is started when the standby time has elapsed from the charging start time,
Learning the full charge capacity after the charging end time has passed,
That is the summary.

This second full-charge capacity learning device of the present invention, when performing external charging between the set charging start time and the set charging end time, performs learning of the full-charge capacity last time. When the elapsed time exceeds a predetermined time, the standby time for preparation for external charging, the charging time required for executing external charging, and the polarization required for eliminating the polarization of the secondary battery after external charging is completed. Set the time before the charging end time as the sum of the cancellation time and the charging start time, start the external charging when the standby time has elapsed from the charging start time, and after the charging end time has elapsed, Learn full charge capacity. Therefore, since the full charge capacity can be learned after the polarization of the secondary battery is eliminated, the full charge capacity can be learned with high accuracy, and the learning frequency of the charge capacity can be secured. After external charging is completed, the secondary battery is left uncharged and discharged during the polarization elimination time.However, depending on the outside temperature, if external charging is completed and a secondary battery with a high storage rate is left alone, The secondary battery deteriorates and the performance deteriorates. In view of this, when the elapsed time from the learning of the full charge capacity exceeds the predetermined time, the time of the sum of the standby time, the required charging time and the polarization elimination time is equal to or less than the charging end time. By setting the time as the charge start time and learning the full charge capacity after the charge end time has passed, regardless of whether or not the elapsed time after learning the full charge capacity exceeds the predetermined time, The deterioration of the performance of the secondary battery can be suppressed as compared with the case where the time before the charging end time is set as the charging start time by the sum of the standby time, the required charging time and the polarization elimination time. As a result, the frequency of learning the full charge capacity can be secured while suppressing the deterioration of the battery performance.

1 is a configuration diagram showing an outline of a configuration of an electric vehicle 20 equipped with a full-charge capacity learning device as an embodiment of the present invention. 6 is a flowchart showing an example of an external charging routine executed by the electronic control unit 70.

Next, modes for carrying out the present invention will be described using examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of an electric vehicle 20 equipped with a full-charge capacity learning device as an embodiment of the present invention. As illustrated, the electric vehicle 20 of the embodiment includes a motor 32, an inverter 34, a battery 36 as a power storage device, a charger 50, and an electronic control unit 70. In the embodiment, the electronic control unit 70 corresponds to a “full charge capacity learning device”.

The motor 32 is configured as, for example, a synchronous generator motor, and has a rotor connected to a drive shaft 26 that is connected to the drive wheels 22a and 22b via a differential gear 24. The inverter 34 is used to drive the motor 32 and is connected to the battery 36 via the power line 38. The motor 32 is rotationally driven by the electronic control unit 70 controlling switching of a plurality of switching elements (not shown) of the inverter 34. The battery 36 is configured as, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery.

The charger 50 is connected to the power line 38, and when the equipment-side connector of the charging equipment (external power source) and the vehicle-side connector 51 are connected to each other, the battery 36 is charged with the electric power from the charging equipment. It is configured to be able to perform external charging. The charger 50 is controlled by the electronic control unit 70. Here, the charging facility means a facility capable of supplying electric power to the electric vehicle 20.

Although not shown, the electronic control unit 70 is configured as a microprocessor centered on a CPU, and in addition to the CPU, a ROM for storing processing programs, a RAM for temporarily storing data, an input/output port, communication It has a port. Signals from various sensors are input to the electronic control unit 70 via an input port. The signals input to the electronic control unit 70 include, for example, the rotational position θm of the rotor of the motor 32 from a rotational position sensor (not shown) that detects the rotational position of the rotor of the motor 32, and the phase of each phase of the motor 32. The phase currents Iu, Iv, Iw of each phase of the motor 32 from a current sensor (not shown) that detects a current can be mentioned. Further, the voltage Vb of the battery 36 from the voltage sensor 36 a attached between the terminals of the battery 36, the current Ib of the battery 36 from the current sensor 36 b attached to the output terminal of the battery 36, and the temperature attached to the battery 36. The temperature Tb of the battery 36 from the sensor 36c can also be mentioned. A connection detection signal from the connection detection sensor 52 that detects the connection between the vehicle-side connector 51 and the equipment-side connector of the charging facility can also be mentioned. The ignition signal from the ignition switch 80 and the shift position SP from the shift position sensor 82 which detects the operation position of the shift lever 81 can also be mentioned. The accelerator opening Acc from the accelerator pedal position sensor 84 that detects the depression amount of the accelerator pedal 83, the brake pedal position BP from the brake pedal position sensor 86 that detects the depression amount of the brake pedal 85, and the vehicle speed V from the vehicle speed sensor 88. The ambient temperature Tatm from the temperature sensor 90 that detects the outside air temperature can also be used.

Various control signals are output from the electronic control unit 70 via the output port. Examples of signals output from the electronic control unit 70 include a control signal to the inverter 34 and a control signal to the charger 50. The electronic control unit 70 calculates the storage amount Sb and the storage ratio SOC of the battery 36 based on the integrated value SIb of the current Ib of the battery 36 from the current sensor 36b. Here, the storage amount Sb is the amount of power that can be discharged from the battery 36, and the storage ratio SOC is the ratio of the current storage capacity Fb to the full charge capacity FCC of the battery 36. The full charge capacity FCC uses a value obtained by learning the full charge capacity FCC described later, and a predetermined value FCCref is set as an initial value before the full charge capacity FCC is learned.

In the thus configured electric vehicle 20 of the embodiment, the electronic control unit 70 sets the required torque Td* required for traveling (required for the drive shaft 26) based on the accelerator opening Acc and the vehicle speed V. , The required torque Td* is set to the torque command Tm* of the motor 32, and switching control of the plurality of switching elements of the inverter 34 is performed so that the motor 32 is driven by the torque command Tm*.

Further, in the electric vehicle 20 of the embodiment, when the vehicle-side connector 51 and the equipment-side connector of the charging facility are connected to each other while the vehicle is parked at home or at a charging station when the ignition switch 80 is off (the connection detection sensor 52 causes both (When the connection is detected), the electronic control unit 70 first executes a charging standby process of waiting for preparation for external charging (for example, acquisition of the temperature Tb of the battery 36 or the voltage Vb of the battery 36). After that, external charging is executed by controlling the charger 50 so that the battery 36 is charged using the electric power from the charging facility. Then, when the storage ratio SOC of the battery 36 reaches the predetermined ratio Smax, the control of the charger 50 is ended, and the execution of the external charging is ended. For example, 90%, 95%, 100% or the like is used as the predetermined ratio Smax.

Further, in the electric vehicle 20 of the embodiment, when the time for polarization elimination (polarization elimination time) tpf (several hours) elapses after the external charging of the battery 36 ends, the charge ratio SOCb before external charging and the external charge ratio SOCb. The full charge capacity FCC is learned by the following equation (1) using the storage ratio SOCa after charging and the integrated value SIb of the charging current during external charging. The charge ratio SOCb before external charging is the battery 36 detected by the voltage sensor 36a before the external charging while the vehicle-side connector 51 and the equipment-side connector of the charging facility are not connected during parking at home or at a charging station. Is set by using a known OCV-SOC curve with the open circuit voltage OCV being the voltage Vb. The storage ratio SOCa after external charging is the battery 36 detected by the voltage sensor 36a in a state where the vehicle-side connector 51 and the equipment-side connector of the charging facility are not connected during parking at home or a charging station after external charging. Is set by using a known OCV-SOC curve with the open circuit voltage OCV being the voltage Vb.

FCC=100/(SOCa-SOCb)×SIb ・・・(1)

Next, the operation of the thus configured electric vehicle 20 of the embodiment, particularly the operation when the battery 36 is externally charged by the electric power from the charging facility will be described. FIG. 2 is a flowchart showing an example of an external charging routine executed by the electronic control unit 70. This routine is executed when the vehicle-side connector 51 and the equipment-side connector of the charging equipment are connected while the vehicle is parked at home or at a charging station.

When this routine is executed, the CPU of the electronic control unit 70 executes a process of determining whether or not the departure time of the electric vehicle 20 is set (step S100). When the departure time is not set, external charging is executed after the charging waiting time twait, which is the time required for the charging waiting process, has elapsed (step S110). Then, it is determined whether or not the ignition switch 80 is turned on and the ignition signal is input (step S190). When the ignition switch 80 is not turned on, it waits until it is turned on. When the ignition switch 80 is turned on, subsequently, it is determined whether or not learning of the full charge capacity FCC has succeeded (step S200). Here, if the ignition switch 80 is turned on after the polarization elimination time tpf has elapsed after the external charging, the open circuit voltage OCV cannot be acquired accurately and the full charge capacity FCC cannot be learned. It is determined that the learning has failed, and when the ignition switch 80 is turned on after the polarization elimination time tpf after external charging has elapsed, the full-charge capacity FCC is determined to be successful because the open circuit voltage OCV can be acquired accurately. ..

When it is determined in step S200 that the learning of the full charge capacity FCC has failed, the failure count Nfail is incremented (step S210), and this routine is ended. When it is determined in step S210 that the learning of the full charge capacity FCC has succeeded, the failure count Nfail is cleared (step S220), and this routine ends. Therefore, the failure count Nfail is the number of times the learning of the full charge capacity FCC has failed in succession. In this way, when the departure time is not set, external charging is executed after the charging standby time twait has elapsed since the vehicle-side connector 51 and the equipment-side connector of the charging equipment were connected. Then, when the learning of the full charge capacity FCC is not completed when the ignition switch 80 is turned on, the failure count Nfail is incremented.

When the departure time is set in step S100, it is determined whether or not the number of failures Nfail exceeds the threshold value Nref (step S120). When the number of failures Nfail is less than or equal to the threshold value Nref, the sum of the charging/charging waiting time twait and the time (charging required time) tchr for actually charging the battery 36 with the electric power from the charging facility is defined as the total charging time tsum. It is set (step S122). The required charging time tchr is stored in the ROM as a map of the relationship between the charging power from the charging facility, the current charging ratio SOC of the battery 36, and the charging required time until the charging ratio SOC reaches the predetermined ratio Smax. Is the time derived as the required charging time corresponding to the charging power from the charging facility and the current storage ratio SOC of the battery 36.

When the charging start time tst is set in this manner, a time before the total charging time tsum from the charging end time tend which is slightly before the departure time (for example, several minutes) is set as the charging start time tst (step S124). Then, after starting the charging standby process at the charging start time tst, external charging is started to charge the battery 36, and the charger 50 is controlled so that the external charging is ended at the charging end time tend (step S126). Then, it is determined whether or not the ignition switch 80 is turned on (step S190). Normally, the user turns on the ignition switch 80 near the departure time. Therefore, the ignition switch 80 is often turned on before the polarization elimination time tpf elapses after the external charging ends at the charging end time tend, and the full charge capacity FCC is not often learned.

When the ignition switch 80 is turned on in step S190, the processes of step S200 and subsequent steps are executed, and this routine ends.

When the number of failures Nfail exceeds the threshold value Nref in step S110, the temperature Tbf of the battery 36 at the end of charging is estimated (step S130). The temperature Tbf is estimated as follows.

First, the sum of the charging standby time twait and the required charging time tchr is set as the total charging time tsumc when the polarization of the battery 36 is not considered, and the time before the total charging time tsumc from the charging end time tend is charged. The start time is tstc.

Next, using the temperature Tb of the battery 36 from the temperature sensor 36c attached to the battery 36, the ambient temperature Tatm from the temperature sensor 90 that detects the outside air temperature, and the first map, the charging start time from the present time. The temperature change amount ΔTba of the battery 36 up to tstc is calculated. The first map shows the relationship between the temperature Tb of the battery 36, the ambient temperature Tatm, the time t from the present time to the charging start time tstc, and the amount of temperature change ΔTba when the battery 36 is not charged by experiments or analysis in advance. It is a set map. In the first map, when the temperature Tb of the battery 36 is high, it becomes higher than when it is low, and when the ambient temperature Tatm is high, it becomes higher than when it is low, and the charging start time from the present time. The temperature change amount ΔTba is set so that when the time t to tstc is long, it becomes higher than when it is short.

Then, the temperature change amount ΔTbb of the battery 36 during the charging period is calculated using the current temperature Tb of the battery 36, the temperature change amount ΔTba, the total charging time tsumc, and the second map. The second map is a map in which the relationship between the temperature Tb of the battery 36, the ambient temperature Tatm, the total charging time tsumc, and the temperature change amount ΔTbb during the charging of the battery 36 is determined in advance by experiments or analysis. In the second map, when the temperature Tb of the battery 36 is high, it is higher than when it is low, and when the ambient temperature Tatm is high, it is higher than when it is low, and the total charging time tsumc is high. The temperature change amount ΔTbb is set so that the temperature change amount becomes higher when the temperature is long than when the temperature is short.

In this way, when the temperature change amount ΔTba of the battery 36 from the present to the charging start time tstc and the temperature change amount ΔTbb of the battery 36 during the charging period are set, the temperature change amounts ΔTba and ΔTbb are set to the current temperature Tb of the battery 36. The added temperature is estimated as the temperature Tbf of the battery 36 at the end of charging.

When the temperature Tbf of the battery 36 at the end of charging is estimated, subsequently, the polarization elimination time tpf is set using the estimated temperature Tbf of the battery 36 at the end of charging and the third map (step S140). The third map is a map in which the relationship between the temperature Tbf of the battery 36 at the end of charging and the polarization elimination time tpf is determined in advance by experiments or analysis. In the third map, the polarization elimination time tpf is set such that when the temperature Tb of the battery 36 at the end of charging is low, it becomes longer than when it is high.

Then, the total time of the charging standby time twait, the required charging time tchr, and the polarization elimination time tpf is calculated as the total charging time tsum (step S150), and the charging end time tend before the total charging time tsum is calculated. The time is set as the charging start time tst (step S160). Then, the charging standby process is started at the charging start time tst, then the external charging is started to externally charge the battery 36, and the external charging is ended before the polarization elimination time tpf from the charging end time tend (step S170). ), if the ignition switch 80 is not turned on, it waits until it is turned on (step S190). In step S170, the external charging is ended before the polarization elimination time tpf before the charging end time tend, so that the chance of learning the full charge capacity FCC increases from the charging end time tend to the departure time. Therefore, without considering the polarization elimination time tpf, the time of the sum of the charging standby time twait and the required charging time tchr is set as the total charging time tsum, and the time before the total charging time tsum from the charging end time tend is the charging start time tst. The charging standby process is started at the charging start time tst, the external charging is started to externally charge the battery 36, and the external charging is ended at the charging end time tend. It is possible to secure the frequency of performing the learning of the full charge capacity FCC by increasing the opportunities to perform the learning of the charge capacity FCC. The battery 36 is left without charge/discharge until the polarization elimination time tpf elapses after completion of external charging, but only when the number of failures Nfail exceeds the threshold Nref, that is, the full charge capacity FCC. Since the steps S130 to S170 are executed only when the learning of No. fails consecutively Nref or more times, the battery 36 has a higher power storage rate SOC as compared with the case where the steps S130 to S170 are executed regardless of the failure number Nfail. The chance of being left alone can be reduced. Therefore, the deterioration of the performance of the battery 36 can be suppressed. As a result, it is possible to secure the frequency of learning the full charge capacity FCC while suppressing the deterioration of the performance of the battery 36.

According to the electric vehicle 20 equipped with the full-charge capacity learning device of the above-described embodiment, the full-charge capacity FCC is learned when the external charging is performed between the charge start time tst and the charge end time tend. When the number of failures Nfail exceeds the threshold Nref, the charging/charging waiting time twait for preparing for external charging, the required charging time tchr required to execute external charging, and the polarization of the secondary battery after the external charging is completed A time before the charging end time tend is set as the sum of the polarization elimination time tpf required for the cancellation and the charging start time tst is set as the charging start time tst, and external charging is started after the charging/charging standby time twait has elapsed from the charging start time tst. By learning the full charge capacity FCC after the charging end time tend has elapsed, the deterioration of the performance of the battery 36 can be suppressed. As a result, it is possible to secure the frequency of learning the full charge capacity FCC while suppressing the deterioration of the performance of the battery 36.

In the electric vehicle 20 equipped with the full-charge capacity learning device of the embodiment, the failure count Nfail is set as the number of times the learning of the full-charge capacity FCC has continuously failed. However, assuming that step S220 is not executed, the number of failures Nfail is incremented by 1 each time a failure occurs, and when the number of failures Nfail exceeds the threshold Nrefs (which may be the same value as the threshold Nref or may be a different value), The charging start time tst is set to a time before the charging end time tend, which is the sum of the charging waiting time twait, the required charging time tchr, and the polarization elimination time tpf, and the charging charging waiting time twait is set from the charging start time tst. External charging may be started after a lapse of time, and the full charge capacity FCC may be learned after a charge end time tend has passed.

In the electric vehicle 20 equipped with the full-charge capacity learning device of the embodiment, the charging end time tend is set to a time slightly before the set departure time, but the charging end time tend is set directly instead of the departure time. Good.

In the electric vehicle 20 equipped with the full-charge-capacity learning device of the embodiment, when the number Nfail of failure to learn the full-charge capacity FCC exceeds the threshold value Nref, the charging/charging standby time twait, the required charging time tchr, and the polarization elimination time tpf. And a time before the charging end time tend is set as the charging start time tst, external charging is started after the charging/charging standby time twait has elapsed from the charging start time tst, and the charging end time tend has passed. After that, the full charge capacity FCC is learned. However, when the elapsed time from the previous learning of the full charge capacity FCC exceeds the predetermined time, the charging is completed only for the sum of the charging/charging standby time twait, the required charging time tchr, and the polarization elimination time tpf. A time before the time tend is set as the charge start time tst, external charging is started after the charge/charge waiting time twait has elapsed from the charge start time tst, and the full charge capacity FCC is learned after the charge end time tend. May be.

In the embodiment, the present invention is applied to the full charge capacity learning device mounted on the electric vehicle 20, but the present invention is applied to the full charge capacity learning device mounted on the electric vehicle 20. However, the device is not limited to the above, and may be used in any device as long as the device includes a secondary battery that can be charged by external power.

Correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the electronic control unit 70 corresponds to a “full charge capacity learning device”.

The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the section of means for solving the problem. This is an example for specifically explaining the mode for carrying out the invention, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problem should be made based on the description in that column, and the embodiment is the invention of the invention described in the column of means for solving the problem. This is just a specific example.

Although the embodiments for carrying out the present invention have been described above with reference to the embodiments, the present invention is not limited to these embodiments, and various embodiments are possible within a range not departing from the gist of the present invention. Of course, it can be implemented.

INDUSTRIAL APPLICABILITY The present invention can be used in the manufacturing industry of the full charge capacity learning device.

20 electric vehicle, 22a, 22b drive wheels, 24 differential gear, 26 drive shaft, 32 motor, 34 inverter, 36 battery, 36a voltage sensor, 36b current sensor, 36c, 90 temperature sensor, 38 power line, 50 charger, 51 Vehicle side connector, 52 connection detection sensor, 70 electronic control unit, 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor ..

Claims (1)

A full-charge-capacity learning device that learns the full-charge capacity of a secondary battery that can be externally charged by charging with electric power from an external power source.
When performing the external charging between the set charging start time and the set charging end time, when the number of times the learning of the full charge capacity has failed exceeds a predetermined value, the preparation for the external charging is performed. Standby time for charging, the charging time required to execute the external charging, and the polarization elimination time required to eliminate the polarization of the secondary battery after the external charging is finished, and the charging end time. Set a time earlier than the charging start time, start the external charging when the standby time has elapsed from the charging start time,
Learning the full charge capacity after the charging end time has passed,
Full charge capacity learning device.

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