JP6130779B2 - Capacity estimation device, capacity estimation method and program - Google Patents

Description

  The present invention relates to a capacity estimation device, a capacity estimation method, and a program for a secondary battery.

  It is known that the capacity of secondary batteries such as lithium ion batteries decreases due to deterioration. In order to appropriately manage such a secondary battery, it is necessary to appropriately estimate the capacity of the secondary battery. Patent Document 1 discloses a technique for estimating the capacity of a secondary battery. The technique described in Patent Document 1 estimates the capacity by once fully discharging a secondary battery and then fully charging it, and integrating the amount of charge power.

JP 2008-278624 A

However, the technique described in Patent Document 1 estimates the capacity by charging and discharging the secondary battery from full discharge to full charge when the secondary battery is not operated. In this specification, the capacity of the secondary battery refers to the amount of electricity when the secondary battery is fully charged. Therefore, the capacity of the secondary battery can be estimated at the time of maintenance or the like where the secondary battery is not operated. However, when the capacity is estimated using the technique described in Patent Document 1 for the actually operated secondary battery, charging / discharging cannot be completed by the start of operation, and the secondary battery is charged at the start of operation. The rate may not be an appropriate value.
An object of the present invention is to provide a capacity estimation device, a capacity estimation method, and a program for estimating capacity without affecting the operation of a secondary battery.

In the first aspect , the charging time of the secondary battery is changed from the current charging rate to the first charging rate, and the charging time of the secondary battery is set to the first charging time. It is determined whether or not the sum of the second time, which is the time required to change from the rate to the second charging rate, is equal to or less than the non-operation time, which is the time during which the secondary battery is not operated. When the sum of the time determination unit and the first time and the second time is equal to or less than the non-operation time, the charging rate of the secondary battery is set by charging or discharging the secondary battery. A charging rate adjustment unit that changes the first charging rate to the second charging rate, and a period during which the charging rate adjustment unit changes the charging rate of the secondary battery from the first charging rate to the second charging rate. A current integrating unit that specifies an integrated value of a current that is charged or discharged by the secondary battery, and the first specified by the current integrating unit. Of based on the integrated value of the difference and the current of the second charging rate and the charging rate, and capacity estimating unit for estimating the capacity of the secondary battery, the sum of said first time and said second time the When the non-operation time is exceeded, the first charging rate is corrected to be close to the current charging rate of the secondary battery, or the second charging rate is corrected to be close to the first charging rate. It is a capacity | capacitance estimation apparatus provided with a charging rate correction part .

  The third mode is the second mode, wherein the charge rate correction unit is configured to charge the first charge rate or the second charge when the secondary battery is more likely to be deteriorated than charged. A capacity estimation device that corrects the higher one of the rates and corrects the lower of the first charging rate or the second charging rate when the secondary battery is more likely to deteriorate than discharging. is there.

  Moreover, a 4th aspect is a 2nd aspect. WHEREIN: The said charging rate correction | amendment part improves the estimation accuracy of a charging rate by correcting among the said 1st charging rate or the said 2nd charging rate. This is a capacity estimation device that corrects the method.

  Moreover, a 5th aspect specifies the charge rate or discharge rate of the said secondary battery in which charge or discharge of the said secondary battery is complete | finished within the said non-operation time in any one of the 1st to 4th aspects. A capacity specifying device including a rate specifying unit, wherein the charge rate adjusting unit charges or discharges the secondary battery at a charge rate or a discharge rate specified by the rate specifying unit.

  Moreover, a 6th aspect is a 5th aspect. WHEREIN: The said rate specific | specification part progresses deterioration relatively among the rates in which deterioration of the said secondary battery tends to progress relatively among charge and discharge. This is a capacity estimation device that lowers relative to the harder rate.

Further, according to the eighth aspect , the first time which is a time required for changing the charging rate of the secondary battery from the current charging rate to the first charging rate, and the charging rate of the secondary battery are set to the first time. Whether or not the sum of the second time, which is the time required to change from the charging rate to the second charging rate, is equal to or less than the non-operating time, which is the time during which the secondary battery is not operated. The step of determining, and when the sum of the first time and the second time is equal to or less than the non-operation time, the secondary battery is charged or discharged, whereby the charging rate of the secondary battery is during that first the steps of the second charging rate from the charging rates, before Symbol the second charging rate charge ratio from the first charging rate of the secondary battery, the secondary battery is charged or identifying the integrated value of current discharge, the difference between the the specified first charging rate and the second charging rate Based on the integrated value of the microcurrent, estimating the capacity of the secondary battery, when the sum of said first time and said second time is the non-operational time or more, the first charge Correcting the rate to approach the current charge rate of the secondary battery, or correcting the second charge rate to approach the first charge rate .

Further, the ninth aspect provides the computer with a first time which is a time required to change the charging rate of the secondary battery from the current charging rate to the first charging rate, and the charging rate of the secondary battery. Is the sum of the second time, which is the time required to change the first charging rate from the first charging rate, to the non-operating time, which is the time during which the secondary battery is not operated A time determination unit that determines whether the secondary battery is charged or discharged when the sum of the first time and the second time is equal to or less than the non-operation time; A charging rate adjustment unit that changes the charging rate from the first charging rate to the second charging rate, and the charging rate adjusting unit changes the charging rate of the secondary battery from the first charging rate to the second charging rate. A current integrating unit for specifying an integrated value of current charged or discharged by the secondary battery, and the current integrating unit Based on the integrated value of the difference and the current of the second charge rate and specified the first charging rate, the capacity estimation unit that estimates the capacity of the secondary battery, the first time and the second time When the sum is equal to or longer than the non-operation time, the first charging rate is corrected to approach the current charging rate of the secondary battery, or the second charging rate is set to the first charging rate. It is a program for making it function as a charge rate correction part which corrects so that it may approach .

  According to at least one of the above aspects, the capacity estimation device can perform charge / discharge from the first charge rate to the second charge rate during a period when the secondary battery is not operated. Estimate the capacity of the secondary battery. Thereby, the capacity estimation device can estimate the capacity without affecting the operation of the secondary battery.

It is a schematic block diagram which shows the structure of the capacity | capacitance estimation apparatus which concerns on at least 1 embodiment. 5 is a flowchart illustrating a capacity estimation method according to at least one embodiment. It is a schematic block diagram which shows the structure of the capacity | capacitance estimation apparatus which concerns on at least 1 embodiment. 5 is a flowchart illustrating a capacity estimation method according to at least one embodiment. It is a schematic block diagram which shows the structure of the capacity | capacitance estimation apparatus which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of the computer which concerns on at least 1 embodiment.

<< First Embodiment >>
Hereinafter, embodiments will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram illustrating a configuration of a capacity estimation apparatus 100 according to at least one embodiment.
The capacity estimation apparatus 100 according to this embodiment is in a fully charged state at the start of operation, and estimates the capacity of a secondary battery that is controlled to be fully charged before the start of the next operation after the operation period ends. . The secondary battery that is a target of capacity estimation by the capacity estimation apparatus 100 according to the present embodiment is discharged during the day when the price of commercial power is high to operate the load and is charged at night when the price of commercial power is low. Therefore, it is used for reducing the power cost.
The capacity estimation device 100 includes a time calculation unit 101, a time determination unit 102, a charging rate adjustment unit 103, a current integration unit 104, and a capacity estimation unit 105.

The time calculation unit 101 calculates the time during which the secondary battery is not operated (hereinafter referred to as non-operation time).
The time calculation unit 101 calculates the time required to completely discharge the secondary battery (hereinafter referred to as preparatory discharge time). That is, the time calculation unit 101 calculates the time required to discharge the secondary battery from the current charging rate to the charging rate of 0%. In the present embodiment, the charging rate of 0% is an example of the first charging rate.
The time calculation unit 101 calculates the time required to fully charge a fully discharged secondary battery (hereinafter referred to as estimation charging time). That is, the time calculation unit 101 calculates the time required to discharge the secondary battery from the charging rate of 0% to the charging rate of 100%. In the present embodiment, the charging rate of 100% is an example of the second charging rate.

  The time determination unit 102 determines whether or not the non-operation time is equal to or longer than the time obtained by adding the preparation discharge time and the estimation charge time. That is, the time determination unit 102 determines whether or not the secondary battery can be fully charged after the secondary battery is completely discharged during the non-operation time.

When the time obtained by adding the preparation discharge time and the estimation charge time is less than the non-operation time, the charge rate adjustment unit 103 fully discharges the secondary battery and then fully charges it.
The current integrating unit 104 integrates the charging current from the time when the charging rate adjusting unit 103 completely discharges the secondary battery until the secondary battery is fully charged, and calculates an integrated current value.
The capacity estimation unit 105 estimates the capacity of the secondary battery based on the current value accumulated by the current accumulation unit 104.

Next, a capacity estimation method by the capacity estimation apparatus 100 according to the present embodiment will be described.
FIG. 2 is a flowchart illustrating a capacity estimation method according to at least one embodiment.
First, when the operation period of the secondary battery ends, the time calculation unit 101 calculates a non-operation time (step S101). When the operation start time and the operation end time of the secondary battery are determined, the time calculation unit 101 calculates the time from the operation end time to the next operation start time. On the other hand, when only the operation start time of the secondary battery is determined, the time calculation unit 101 calculates the time from the time when the operation end input is received to the next operation start time.

  Next, the time calculation unit 101 calculates a preparatory discharge time based on the remaining amount of electricity of the secondary battery and the discharge current or discharge rate (step S102). The remaining amount of electricity is the amount of electricity obtained by multiplying the capacity of the secondary battery by the current charging rate. Since the discharge rate can be obtained by integrating the discharge current, the discharge rate and the discharge current are equivalent. For example, when the capacity of the secondary battery is 50 Ah, the current charging rate is 20%, and the discharge current is 10 A, the time calculation unit 101 calculates the preparation discharge time 1 h by calculating 50 Ah × 20% / 10 A. calculate.

  Next, the time calculation unit 101 calculates an estimation charging time based on the capacity of the secondary battery and the characteristics of the charger (step S103). The characteristics of the charger include a charging rate at which CC (Constant Current) charging is switched to CV (Constant Voltage) charging, a charging rate or charging current in CC charging, and a charging duration in CV charging. . For example, when the capacity of the secondary battery is 50 Ah, the charging rate for switching from CC charging to CV charging is 90%, the charging current in CC charging is 10 A, and the charging duration of CV charging is 1 h, the time calculation unit 101 is 50 Ah. By calculating x90% / 10A + 1h, the estimation charging time 5.5h is calculated.

  Next, the time determination unit 102 determines whether or not the non-operation time calculated by the time calculation unit 101 is equal to or longer than the sum of the preparation discharge time and the estimation charge time (step S104). When the time determination unit 102 determines that the non-operation time is less than the time obtained by adding the preparatory discharge time and the estimation charge time (step S104: NO), the charge rate adjustment unit 103 is secondary to the charger. A charge command for charging the battery is output to fully charge the secondary battery (step S105), and the process ends. That is, when the secondary battery cannot be fully charged after being completely discharged during the non-operation time, the capacity estimation device 100 does not estimate the capacity of the secondary battery.

On the other hand, when the time determination unit 102 determines that the non-operation time is equal to or longer than the sum of the preparatory discharge time and the estimation charge time (step S104: YES), the charge rate adjustment unit 103 determines that the discharge load A discharge command for discharging the secondary battery is output (step S106). Next, the charging rate adjustment unit 103 determines whether or not the voltage of the secondary battery has reached a predetermined voltage corresponding to a charging rate of 0% (step S107). When it is determined that the voltage of the secondary battery has not reached the voltage corresponding to the charging rate of 0% (step S107: NO), the charging rate adjustment unit 103 returns to step S106 and continues outputting the discharge command.
On the other hand, when it is determined that the voltage of the secondary battery has reached the voltage corresponding to the charging rate of 0% (step S107: YES), the charging rate adjustment unit 103 stops the output of the discharge command. Thereby, the secondary battery is completely discharged.

  Next, the current integrating unit 104 resets the integrated current value to 0, and starts integrating the current charged in the secondary battery (step S108). Next, the charging rate adjustment unit 103 outputs a charging command for causing the charger to CC charge the secondary battery (step S109). The current integrating unit 104 updates the current integrated value by adding the amount of electricity obtained by dividing the charging rate of the charging current by the calculation cycle to the previous integrated current value (step S110). Next, the charging rate adjusting unit 103 determines whether or not the voltage of the secondary battery has reached a voltage corresponding to a charging rate of 100% (step S111). When it is determined that the voltage of the secondary battery has not reached the voltage corresponding to the charging rate of 100% (step S111: NO), the charging rate adjustment unit 103 returns to step S109 and continues to output the charging command for CC charging. .

  On the other hand, when it is determined that the charging rate of the secondary battery has reached a voltage corresponding to the charging rate of 100% (step S111: YES), the charging rate adjusting unit 103 causes the charger to CV charge the secondary battery. A charge command is output (step S112). This cancels the voltage drop due to the internal resistance of the secondary battery. The current integrating unit 104 updates the current integrated value by adding the amount of electricity obtained by integrating the charging current value in the calculation cycle to the previous integrated current value (step S113). Next, the charging rate adjustment unit 103 determines whether or not the measured value of the charging current is equal to or lower than a predetermined charging stop current value, and whether the elapsed time from the time when the CV charging is started reaches a predetermined charging duration. It is determined whether or not (step S114).

  The charge rate adjusting unit 103 determines that the measured value of the charging current is larger than the charging stop current value and that the elapsed time from the time when the CV charging is started has not reached the predetermined charging duration (step S114: NO) ), Returning to step S112, the output of the charge command for CV charging is continued. On the other hand, when the charging rate adjustment unit 103 determines that the measured value of the charging current has reached a value for ending CV charging or that the elapsed time from the time when the CV charging is started has reached a predetermined charging duration ( (Step S114: YES), the capacity estimation unit 105 estimates the amount of electricity indicated by the current integration value calculated by the current integration unit 104 as the capacity of the secondary battery (step S115).

  As described above, according to the present embodiment, the capacity estimation device 100 can charge / discharge the secondary battery from the charge rate 0% to the charge rate 100% during the period when the secondary battery is not operated. Estimate the capacity of. Thereby, the capacity estimation apparatus 100 can estimate the capacity without affecting the operation of the secondary battery. Moreover, according to this embodiment, since the capacity | capacitance of a secondary battery is estimated by charge of charge rate 0% to charge rate 100%, the error of the estimated capacity | capacitance can be made small.

  In the present embodiment, the case where charging / discharging at a charging rate of 0% to 100% is described, but the allowable maximum charging rate and the allowable minimum charging rate are determined in consideration of deterioration of the secondary battery. In this case, these values may be the upper and lower limits. That is, in the present embodiment, a case has been described in which the charging rate is 0% as a fully discharged state charging rate and the charging rate is 100% as a fully charged state charging rate. The charging rate may be a fully discharged state charging rate or a fully charged state charging rate.

<< Second Embodiment >>
FIG. 3 is a schematic block diagram illustrating a configuration of the capacity estimation apparatus 200 according to at least one embodiment.
In addition to the configuration of the first embodiment, the capacity estimation apparatus 200 according to the second embodiment further includes a charge rate correction unit 206, and includes a time calculation unit 201, a time determination unit 202, and a charge rate adjustment. The operations of the unit 203 and the capacity estimation unit 205 are different. Of the configurations of the second embodiment, those having the same configuration as the first embodiment will be described using the same reference numerals as those of the first embodiment.
The capacity estimation apparatus 200 according to the present embodiment estimates the capacity of the secondary battery within a range that can be charged and discharged during a period when the secondary battery is not operated.

  When the time determination unit 202 determines that the non-operation time is less than the sum of the preparation discharge time and the estimation charge time, the charge rate correction unit 206 performs the first charge rate or the second charge. Correct at least one of the rates. Specifically, the charging rate correction unit 206 corrects the first charging rate to be close to the current charging rate of the secondary battery, or corrects the second charging rate to be close to the first charging rate. .

Next, a capacity estimation method by the capacity estimation apparatus 200 according to the present embodiment will be described.
FIG. 4 is a flowchart illustrating a capacity estimation method according to at least one embodiment.
First, when the operation period of the secondary battery ends, the time calculation unit 201 calculates a non-operation time (step S201). Next, the time calculation unit 201 calculates a preparatory discharge time based on the remaining amount of electricity of the secondary battery, the discharge current or discharge rate, the capacity of the secondary battery, and the first charging rate (step S202). The initial value of the first charging rate is 0%. Next, the time calculation unit 201 calculates a charging time for estimation based on the capacity of the secondary battery, the characteristics of the charger, the first charging rate, and the second charging rate (step S203). The initial value of the second charging rate is 100%.

  Next, the time determination unit 202 determines whether or not the non-operation time calculated by the time calculation unit 201 is equal to or longer than the sum of the preparation discharge time and the estimation charge time (step S204). When the time determination unit 202 determines that the non-operation time is less than the sum of the preparation discharge time and the estimation charge time (step S204: NO), the charge rate correction unit 206 outputs the first charge rate. Alternatively, at least one of the second charging rates is corrected (step S205), and the process returns to step S202.

  The charging rate correction unit 206 corrects the first charging rate to be close to the current charging rate of the secondary battery, or corrects the second charging rate to be close to the first charging rate. In the present embodiment, since the secondary battery needs to be in a fully charged state at the start of operation, the second charging rate remains 100%, and the first charging rate is set to the current charging rate of the secondary battery. Make corrections to bring it closer.

On the other hand, when the time determination unit 202 determines that the non-operation time is equal to or greater than the time obtained by adding the preparation discharge time and the estimation charge time (step S204: YES), the charge rate adjustment unit 203 sets the discharge load. A discharge command for discharging the secondary battery is output (step S206). Next, the charging rate adjustment unit 203 determines whether or not the voltage of the secondary battery has reached a voltage corresponding to the first charging rate (step S207). When it is determined that the voltage of the secondary battery has not reached the voltage corresponding to the first charging rate (step S207: NO), the charging rate adjustment unit 203 returns to step S206 and continues outputting the discharge command.
On the other hand, when it is determined that the voltage of the secondary battery has reached the voltage corresponding to the first charging rate (step S207: YES), the charging rate adjustment unit 203 stops the output of the discharge command.

  Next, the current integrating unit 104 resets the integrated current value to 0 and starts integrating the current charged in the secondary battery (step S208). Next, the charging rate adjustment unit 203 outputs a charging command for causing the charger to CC charge the secondary battery (step S209). The current integrating unit 104 updates the current integrated value by adding the amount of electricity obtained by dividing the charging rate of the charging current by the calculation cycle to the previous integrated current value (step S210). Next, the charging rate adjustment unit 203 determines whether or not the voltage of the secondary battery has reached a voltage corresponding to the second charging rate (step S211). When it is determined that the voltage of the secondary battery has not reached the voltage corresponding to the second charging rate (step S211: NO), the charging rate adjustment unit 203 returns to step S209 and continues to output the charging command for CC charging. To do.

  On the other hand, when it is determined that the voltage of the secondary battery has reached the voltage corresponding to the second charging rate (step S211: YES), the charging rate adjusting unit 203 causes the charger to charge the secondary battery in CV. Is output (step S212). The current integrating unit 104 updates the current integrated value by adding the amount of electricity obtained by integrating the charging current value in the calculation cycle to the previous integrated current value (step S213). Next, the charging rate adjustment unit 203 determines whether or not the measured value of the charging current has become equal to or less than a predetermined charging stop current value, and whether the elapsed time from the time when the CV charging is started reaches a predetermined charging duration. It is determined whether or not (step S214).

  The charging rate adjustment unit 203 determines that the measured value of the charging current is not less than or equal to the predetermined charging stop current value and that the elapsed time from the time when the CV charging is started does not reach the predetermined charging duration. In the case (step S214: NO), the process returns to step S212 to continue outputting the charge command for CV charging. On the other hand, when the charging rate adjustment unit 203 determines that the measured value of the charging current has become equal to or less than the predetermined charging stop current value or that the elapsed time from the time when the CV charging is started has reached the predetermined charging duration (Step S214: YES), the capacity estimation unit 205 estimates the capacity of the secondary battery based on the amount of electricity indicated by the current integration value calculated by the current integration unit 104 (Step S215). Specifically, the capacity of the secondary battery is estimated by multiplying the current integrated value by the reciprocal of the difference between the first charging rate and the second charging rate.

  Thus, according to the present embodiment, the capacity estimation device 200 can perform the first charging rate or the second charging so that the capacity of the secondary battery can be estimated during the period when the secondary battery is not operated. Correct the rate. Thereby, the capacity estimation apparatus 200 can estimate the capacity without affecting the operation of the secondary battery.

<< Third Embodiment >>
The capacity estimation apparatus 200 according to the third embodiment is different from the second embodiment in the charging rate correction method by the charging rate correction unit 206. The configuration of the capacity estimation device 200 is the same as that of the second embodiment.

  The charging rate correction unit 206 performs the second charging, which is a threshold value for stopping charging when the secondary battery is discharged and when the secondary battery is more easily deteriorated. The rate is modified to approach the first charge rate. On the other hand, when the secondary battery is more likely to deteriorate during discharging, the first charging rate, which is a threshold value for stopping discharging, is corrected to be close to the current charging rate.

That is, the charging rate correction unit 206 corrects the higher one of the first charging rate and the second charging rate when the secondary battery is more likely to be deteriorated than the discharging, and the discharging is corrected more than the charging. If the secondary battery is likely to deteriorate, the lower one of the first charging rate and the second charging rate is corrected.
Thereby, the capacity estimation device 200 can suppress deterioration of the secondary battery due to capacity estimation as much as possible while accurately estimating the capacity of the secondary battery.

<< Fourth Embodiment >>
The capacity estimation apparatus 200 according to the fourth embodiment is different from the second and third embodiments in the charging rate correction method by the charging rate correction unit 206. The configuration of the capacity estimation device 200 is the same as in the second and third embodiments.

  The charging rate correction unit 206 corrects the one in which the estimation accuracy of the charging rate is improved by correcting the first charging rate or the second charging rate. The estimation of the charging rate of the secondary battery is performed by reading out the charging rate corresponding to the open circuit voltage based on a table or function indicating the relationship between the open circuit voltage and the charging rate of the secondary battery. Although the open circuit voltage and the charging rate are in a monotonically increasing relationship, they are not necessarily in a proportional relationship. That is, the rate of change of the charging rate with respect to the change of the threshold voltage (tangential slope, differential coefficient) is not necessarily constant. For this reason, the smaller the change rate, the smaller the estimation error of the charging rate due to the error of the open circuit voltage. Therefore, in the present embodiment, the charging rate correction unit 206 corrects one of the first charging rate and the second charging rate that has a larger decrease in the change rate due to the correction.

  As a result, the capacity estimation apparatus 200 estimates the capacity even when the capacity is estimated when charging / discharging from the charging rate of 0% to the charging rate of 100% is not possible during the period when the secondary battery is not operated. Errors can be suppressed.

<< Fifth Embodiment >>
FIG. 5 is a schematic block diagram illustrating a configuration of the capacity estimation apparatus 300 according to at least one embodiment.
In addition to the configuration of the second embodiment, the capacity estimation apparatus 300 according to the fifth embodiment further includes a rate specifying unit 307, and the operation of the charging rate adjustment unit 303 is different. Note that, in the configuration of the fifth embodiment, the same configuration as that of the second embodiment will be described using the same reference numerals as those of the second embodiment.

  The rate specifying unit 307 specifies a charge rate or discharge rate at which charging or discharging of the secondary battery ends within a non-operation time. Specifically, when the rate specifying unit 307 can perform charging from the first charging rate to the second charging rate during the non-operation time, the time required for charging and discharging is equal to the non-operation time. Thus, the charge rate and the discharge rate are specified.

  That is, the rate specifying unit 307 lowers (decreases) the charge rate and the discharge rate from the charge rate used for calculating the preparatory discharge time and the charge rate used for calculating the estimated charge time. As a result, the heat generation of the secondary battery can be reduced as compared with the case where charging / discharging is performed using the discharge rate used for calculating the preparatory discharge time and the charge rate used for calculating the estimation charge time. The deterioration of the secondary battery can be suppressed. Further, since the influence of the internal resistance and polarization resistance of the secondary battery can be reduced, the voltage measurement accuracy is improved, so that the capacity estimation accuracy can be improved.

  In the present embodiment, the rate specifying unit 307 determines the rate of decrease in the rate at which deterioration of the secondary battery is more likely to proceed among the charge and discharge, and the rate at which degradation is less likely to proceed. Increase relative to the amount of decrease. For example, when the secondary battery has a characteristic that is more likely to deteriorate during charging than during discharging, such as a lithium ion battery, the rate specifying unit 307 increases the reduction amount of the charging rate more than the reduction amount of the discharging rate. Thereby, the heat_generation | fever of the secondary battery by capacity | capacitance estimation can be suppressed efficiently.

As described above, the embodiment has been described in detail with reference to the drawings. However, the specific configuration is not limited to that described above, and various design changes and the like can be made.
For example, in the above-described embodiment, the case where the capacity estimation device 300 calculates time, integrates current, and outputs a charge / discharge command is described, but the present invention is not limited thereto. For example, in other embodiments, the capacity estimation apparatus 300 may perform these processes by sharing the charger and the discharge load. Data used between devices may be stored in each memory, or may be transferred by connecting devices by communication. What can be measured such as a current value may be measured using a measuring instrument.

  Moreover, although embodiment mentioned above demonstrated the case where a capacity | capacitance was estimated by making it charge after discharging a secondary battery, it is not restricted to this. For example, in another embodiment, the capacity estimation device 300 may charge the secondary battery and then discharge it, and estimate the capacity based on the integrated value of the discharge current. That is, the first charging rate may be higher than the second charging rate.

  Moreover, although embodiment mentioned above demonstrated the case where the charging rate adjustment parts 103 and 203 performed discharge operation by fixed electric current (CC discharge) until completion | finish conditions were satisfied, it is not restricted to this. For example, the charge rate adjusting units 103 and 203 may switch the discharge to CV discharge after the voltage of the secondary battery reaches a voltage corresponding to the first charge rate. The discharge end condition in this case is performed by determining whether the discharge current has reached a predetermined discharge stop current value or whether the CV discharge elapsed time has reached the CV discharge duration. In this case, the preparation discharge time is obtained by adding the time for CC discharge from the current state to the first charge rate and the CV discharge duration. Thereby, the influence of the voltage drop at the time of discharging due to the internal resistance is canceled and the error between the first charging rate and the stop charging rate is reduced, so that the capacity estimation accuracy can be improved.

  In addition, for example, the charging rate adjusting unit 203 has reached the voltage corresponding to the first charging rate after the voltage of the secondary battery has reached the voltage corresponding to the second charging rate and the voltage corresponding to the second charging rate. Later, charging and discharging may be stopped, the voltage may be measured to correct the charging rate, and the capacity may be estimated from the difference. In this case, since the charging rate can be obtained from the open circuit voltage, the error in the charging rate due to the voltage drop during charging / discharging is canceled, so that the capacity estimation accuracy can be improved.

FIG. 6 is a schematic block diagram illustrating a configuration of a computer 900 according to at least one embodiment.
The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, and an interface 904.
The capacity estimation device 300 described above is mounted on the computer 900. The operation of each processing unit described above is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads a program from the auxiliary storage device 903, develops it in the main storage device 902, and executes the above processing according to the program.

  In at least one embodiment, the auxiliary storage device 903 is an example of a tangible medium that is not temporary. Other examples of the tangible medium that is not temporary include a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, and a semiconductor memory connected via the interface 904. When this program is distributed to the computer 900 via a communication line, the computer 900 that has received the distribution may develop the program in the main storage device 902 and execute the above processing.

  The program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that realizes the above-described function in combination with another program already stored in the auxiliary storage device 903.

  DESCRIPTION OF SYMBOLS 100 ... Capacity estimation apparatus 101 ... Time calculation part 102 ... Time determination part 103 ... Charging rate adjustment part 104 ... Current integration part 105 ... Capacity estimation part 200 ... Capacity estimation apparatus 201 ... Time calculation part 202 ... Time determination part 203 ... Charge rate Adjustment unit 205 ... Capacity estimation unit 206 ... Charging rate correction unit 300 ... Capacity estimation device 307 ... Rate specification unit 303 ... Charging rate adjustment unit 900 ... Computer 901 ... CPU 902 ... Main storage device 903 ... Auxiliary storage device 904 ... Interface

Claims (7)

A first time, which is a time required to change the charging rate of the secondary battery from the current charging rate to the first charging rate, and the charging rate of the secondary battery from the first charging rate to the second charging rate. A time determination unit that determines whether or not the sum of the second time, which is the time required for the rate, is equal to or less than the non-operation time, which is the time during which the secondary battery is not operated,
When the sum of the first time and the second time is equal to or less than the non-operation time, the secondary battery is charged or discharged, thereby changing the charge rate of the secondary battery to the first charge rate. To the second charging rate, the charging rate adjustment unit,
Current integration for specifying an integrated value of current charged or discharged by the secondary battery while the charging rate adjustment unit changes the charging rate of the secondary battery from the first charging rate to the second charging rate. And
A capacity estimating unit that estimates a capacity of the secondary battery based on a difference between the first charging rate and the second charging rate specified by the current integrating unit and an integrated value of current ;
When the sum of the first time and the second time is equal to or greater than the non-operation time, the first charging rate is corrected to approach the current charging rate of the secondary battery, or the second A capacity estimation device comprising: a charging rate correction unit that corrects the charging rate to be close to the first charging rate . The charging rate correction unit corrects the higher one of the first charging rate and the second charging rate when charging is more likely to deteriorate than when discharging, and discharging more than charging. when said deterioration of the secondary battery is likely to proceed, the capacity estimating apparatus according to claim 1 for correcting the lower of the first charging rate or the second charging rate. The capacity estimation apparatus according to claim 1 , wherein the charging rate correction unit corrects one of the first charging rate and the second charging rate that is improved by improving the charging rate estimation accuracy. A rate specifying unit for specifying a charge rate or a discharge rate of the secondary battery that completes charging or discharging of the secondary battery within the non-operation time;
The capacity estimation device according to any one of claims 1 to 3 , wherein the charge rate adjustment unit charges or discharges the secondary battery at a charge rate or a discharge rate specified by the rate specification unit. The rate specifying unit is configured to reduce a rate decrease rate of the secondary battery, which is more likely to be deteriorated, to a rate decrease rate, which is relatively less likely to progress. The capacity estimation apparatus according to claim 4 , wherein the capacity estimation apparatus is relatively large. A first time, which is a time required to change the charging rate of the secondary battery from the current charging rate to the first charging rate, and the charging rate of the secondary battery from the first charging rate to the second charging rate. Determining whether the sum of the second time, which is the time required for the rate, is equal to or less than the non-operation time, which is the time during which the secondary battery is not operated;
When the sum of the first time and the second time is equal to or less than the non-operation time, the secondary battery is charged or discharged, thereby changing the charge rate of the secondary battery to the first charge rate. To the second charging rate,
The charging rate of the previous SL rechargeable battery during the said second charging rate from the first charging rate, the steps of the secondary battery to identify the integrated value of current for charging or discharging,
On the basis of the integrated value of the difference and the current of the identified first charging rate and the second charging rate, and estimating the capacity of the secondary battery,
When the sum of the first time and the second time is equal to or greater than the non-operation time, the first charging rate is corrected to approach the current charging rate of the secondary battery, or the second And correcting the charging rate so as to approach the first charging rate . Computer
A first time, which is a time required to change the charging rate of the secondary battery from the current charging rate to the first charging rate, and the charging rate of the secondary battery from the first charging rate to the second charging rate. A time determination unit that determines whether or not the sum of the second time, which is the time required for the rate, is equal to or less than the non-operation time, which is the time during which the secondary battery is not operated,
When the sum of the first time and the second time is equal to or less than the non-operation time, the secondary battery is charged or discharged, thereby changing the charge rate of the secondary battery to the first charge rate. To a second charging rate to a charging rate adjustment unit,
Current integration for specifying an integrated value of current charged or discharged by the secondary battery while the charging rate adjustment unit changes the charging rate of the secondary battery from the first charging rate to the second charging rate. Part,
A capacity estimation unit that estimates a capacity of the secondary battery based on a difference between the first charging rate and the second charging rate specified by the current integration unit and an integrated value of current ;
When the sum of the first time and the second time is equal to or greater than the non-operation time, the first charging rate is corrected to approach the current charging rate of the secondary battery, or the second The program for functioning as a charging rate correction | amendment part which corrects the charging rate of this so that it may approach the said 1st charging rate .

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