JP2020060489A - Device for correcting estimated result of full-charge capacity - Google Patents

Abstract

To provide a device for correcting an estimated result of full-charge capacity, achieving correction of an estimated result of full-charge capacity without providing feeling of strangeness to a user.SOLUTION: A device 10 for correcting an estimated result of full-charge capacity is provided that includes: a battery B which charges/discharges and outputs driving power of a motor for traveling a vehicle; and a controller 5 which estimates a current full-charge capacity of the battery B, and corrects the estimated current full-charge capacity from a change amount of a charge rate of the battery B, according to a first relational expression of a corrected current full-charge capacity=a corrected previous full-charge capacity×a first coefficient+a current full-charge capacity estimated from a change amount of a charge rate of a battery B×a second coefficient. In estimating the full-charge capacity for estimation of SOC of the battery B, the controller 5 corrects the estimated current full-charge capacity by increasing a rate of the second coefficient in the first relational expression, compared to a case in which the full-charge capacity for EV distance calculation is estimated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a full charge capacity estimation result correction device that corrects an estimation result of a full charge capacity of a battery.

  As a full-charge capacity estimation device for an existing power storage device, the charging rate difference value that is the result of subtracting the charging rate of the battery before the start of charging from the charging rate of the power storage device after the end of charging, and the charging rate difference value flowing to the power storage device being charged. There is a method in which a current integrated value that is an integrated value of current is calculated, and the result of dividing the calculated current integrated value by the charging rate difference value is estimated as the full charge capacity of the power storage device. As a related technique, there is Patent Document 1, for example.

JP2012-058028A

  However, when estimating the full charge capacity of the power storage device by the above-mentioned conventional technique, an error may occur in the estimation result of the full charge capacity due to various error factors.

  For example, in order to estimate the difference in charge rate (ΔSOC) before the start of charging and after the end of charging, a method of acquiring the voltage value after polarization elimination due to charging as OCV and estimating the SOC from the SOC-OCV curve is common. is there. However, in reality, an error occurs in the estimated SOC due to a battery voltage measurement error, a battery temperature measurement error, a variation in the SOC-OCV curve, and the like. This may cause an error in the estimation result of the full charge capacity.

  An object according to one aspect of the present invention is to provide a full-charge-capacity estimation-result correction device capable of correcting the estimation result of the full-charge capacity without making the user feel uncomfortable.

  A full-charge-capacity estimation result correction device, which is one mode of the present invention, estimates a current full-charge capacity of a power storage device that charges and discharges and outputs drive power of a motor that drives a vehicle, and the current storage device. At the same time, the first relational expression of the corrected full charge capacity of this time = the corrected full charge capacity of the previous time × the first coefficient + the full charge capacity estimated this time from the amount of change in the charging rate of the power storage device × the second coefficient, And a controller that corrects the full charge capacity estimated this time from the amount of change in the charge rate of the power storage device, and the controller, when estimating the full charge capacity for estimating the charge rate of the power storage device, The full charge capacity estimated this time is made larger by increasing the ratio of the second coefficient in the first relational expression than in the case of estimating the full charge capacity for calculating the travelable distance at which the vehicle can be driven by the motor. To correct.

  As a result, the charging rate of the power storage device is used as a parameter that does not cause the user to feel uncomfortable even if it changes. Therefore, when correcting the full charging capacity for estimating the charging rate, the controller estimates the full charging capacity estimated this time. Is used as much as possible.

  On the other hand, the travelable distance at which the vehicle can be driven by the motor is used as a parameter that is directly displayed to the user, and thus a sudden change causes the user to feel uncomfortable.

  Therefore, when the controller corrects the full charge capacity for calculating the travelable distance at which the vehicle can be driven by the motor, the controller uses the second coefficient more than when correcting the full charge capacity for estimating the charging rate. By making it smaller, the full charge capacity after the previous correction is largely reflected and used.

  Therefore, when correcting the full charge capacity for calculating the travelable distance, smooth the full charge capacity so that it does not change excessively between the corrected full charge capacity after correction and the corrected full charge capacity this time. Can be corrected. As a result, the change in the travelable distance can be made smooth. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Further, when estimating the full charge capacity for calculating the charging time of the power storage device, the controller further estimates the full charge capacity for calculating the travelable distance that allows the vehicle to travel by the motor. As compared with the case, the ratio of the second coefficient in the first relational expression may be reduced to correct the full charge capacity estimated this time.

  Since the travelable distance that the vehicle can travel greatly changes not only with the full charge capacity but also with the electricity cost, the change in the travelable distance that the vehicle can travel is more than the change in the charging time of the power storage device. , It is unlikely that the user feels strange.

  Therefore, when correcting the full charge capacity for calculating the charging time of the power storage device, the controller sets the second coefficient to be smaller than that for correcting the full charge capacity for calculating the travelable distance. After correction, the full charge capacity should be largely reflected before use.

  Therefore, when correcting the full charge capacity for calculating the charging time of the power storage device, make sure that the full charge capacity does not change excessively between the previous corrected full charge capacity and the current corrected full charge capacity. Can be corrected. As a result, the change in charging time can be smoothed. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  In addition, when estimating the full charge capacity for calculating the charging time of the power storage device, the controller further corrects the full charge capacity after correction = (full charge capacity decrease line in which the full charge capacity decreases with time. Based on the difference between the full charge capacity estimated this time and the full charge capacity estimated from the amount of change in the charging rate of the power storage device) × third coefficient + full charge capacity in which the full charge capacity decreases with time. Based on the second relational expression of the full charge capacity estimated this time based on the decrease line, the full charge capacity estimated this time is corrected based on the full charge capacity decrease line where the full charge capacity decreases with the lapse of time. Good.

  As a result, the charging time of the power storage device is used as a parameter that is directly displayed to the user, so that a sudden change will give the user a feeling of strangeness. Therefore, for an application in which the user feels uncomfortable with such an excessive change, the corrected full charge capacity is calculated by the second relational expression based on the full charge capacity decrease line where the full charge capacity decreases with time. Therefore, when correcting the full-charge capacity for calculating the charging time of the power storage device, the full-charge capacity between the previous corrected full-charge capacity and the current corrected full-charge capacity becomes excessive over time. It is possible to smoothly correct along the line where the full charge capacity decreases so as not to change. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Further, when the controller further corrects the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases with the lapse of time by the second relational expression, Even when the estimated correction of the full charge capacity is larger than the corrected full charge capacity of the previous time, the correction of increasing the full charge capacity may not be performed.

  With this, when the corrected full charge capacity obtained as a result of correcting the full charge capacity is larger than the corrected full charge capacity of the previous time, it does not deteriorate with time, This will give the user a feeling of strangeness. Therefore, in such a case, the controller can eliminate the discomfort of the user by not performing the correction for increasing the full charge capacity.

  A full-charge-capacity estimation result correction device, which is one embodiment of the present invention, includes a power storage device that charges and discharges and outputs drive power of a motor that drives a vehicle, and a full-charge capacity that reduces the full-charge capacity over time. The current full-charge capacity of the power storage device is estimated based on the decrease line, and the current full-charge capacity after correction = (this time is estimated based on the full-charge capacity decrease line in which the full-charge capacity decreases with the lapse of time. The difference between the full charge capacity and the full charge capacity estimated from the amount of change in the charging rate of the power storage device) × third coefficient + the full charge capacity decrease line where the full charge capacity decreases due to the aged time. The third relational expression of the full charge capacity estimated this time is used to correct the full charge capacity estimated this time based on the full charge capacity decrease line where the full charge capacity decreases with the lapse of time. And a controller for estimating a full charge capacity for estimating the charging rate of the power storage device, the controller allows the vehicle to travel by the motor, and a full charge capacity for calculating a travelable distance. Than the case of estimating, the full charge capacity estimated this time is corrected based on the full charge capacity decrease line in which the ratio of the third coefficient in the third relational expression is increased to decrease the full charge capacity with the lapse of time. To do.

  As a result, the charging rate of the power storage device is used as a parameter that does not make the user feel uncomfortable even if it changes, so the controller uses the full charge capacity estimated from the change amount of the charge amount based on the full charge capacity decrease line as much as possible. While reflecting, correction is performed along the line for decreasing full charge capacity to decrease the full charge capacity with the lapse of time.

  On the other hand, the travelable distance at which the vehicle can be driven by the motor is used as a parameter that is directly displayed to the user, and thus a sudden change causes the user to feel uncomfortable.

  Therefore, when the controller corrects the full charge capacity for calculating the travelable distance at which the vehicle can be driven by the motor, the controller sets the third coefficient more than when correcting the full charge capacity for estimating the charging rate. By reducing the size, it is possible to smoothly correct along the line where the full charge capacity decreases. As a result, the change in the travelable distance can be made smooth. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Further, when estimating the full charge capacity for calculating the charging time of the power storage device, the controller further estimates the full charge capacity for calculating the travelable distance that allows the vehicle to travel by the motor. In comparison with the case, the ratio of the third coefficient in the third relational expression may be reduced to correct the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases with the lapse of time. Good.

  Since the travelable distance that the vehicle can travel greatly changes not only with the full charge capacity but also with the electricity cost, the change in the travelable distance that the vehicle can travel is more than the change in the charging time of the power storage device. , It is unlikely that the user feels strange. Therefore, when the controller corrects the full charge capacity for calculating the charging time of the power storage device, the controller reduces the ratio of the third coefficient as compared with the case of correcting the full charge capacity for calculating the travelable distance. , The full charge capacity estimated based on the full charge capacity decrease line is largely reflected and used.

  Therefore, when correcting the full charge capacity for calculating the travelable distance that can drive the vehicle, the full charge capacity estimated based on the full charge capacity decrease line and the full charge capacity estimated this time are calculated. During this period, the full charge capacity can be smoothly corrected along the full charge capacity decrease line so that the full charge capacity does not change excessively. As a result, the change in the travelable distance can be made smooth. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Further, when the controller further corrects the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases according to the aged time, by the third relational expression, Even when the estimated correction of the full charge capacity is larger than the corrected full charge capacity of the previous time, the correction of increasing the full charge capacity may not be performed.

  With this, when the corrected full charge capacity obtained as a result of correcting the full charge capacity is larger than the corrected full charge capacity of the previous time, it does not deteriorate with time, This will give the user a feeling of strangeness. Therefore, in such a case, the controller can eliminate the discomfort of the user by not performing the correction for increasing the full charge capacity.

  It is possible to correct the estimation result of the full charge capacity without making the user feel uncomfortable.

It is a figure which shows an example of the full charge capacity estimation result correction apparatus of Embodiment 1. It is a figure which shows the voltage of a battery B, and the relationship of a current and time. FIG. 7 is a diagram showing the relationship between the full charge capacity corrected for SOC estimation of battery B, EV distance calculation, and battery B charging time calculation and the number of years. It is a figure which shows an example of the full charge capacity fall line L1 which shows the relationship between full charge capacity and aged time.

<Embodiment 1>
The first embodiment will be described in detail below with reference to the drawings.

FIG. 1 is a diagram illustrating an example of a full charge capacity estimation result correction device according to the first embodiment.
The full charge capacity estimation result correction device 10 shown in FIG. 1 corrects the estimation result of the full charge capacity of the battery B, and includes a switch SW, a current detection unit 1, a voltage detection unit 2, and a storage unit 3. And a display unit 4 and a controller 5.

  The battery B may be configured by, for example, one secondary battery (for example, a lithium ion battery, a nickel hydrogen battery, an electric double layer capacitor, or the like), or may be configured by two or more secondary batteries. . Battery B is an example of a power storage device. In addition, when the switch SW is in the conductive state, power is supplied from the charger Ch to the battery B, or the vehicle Ve in which the battery B is mounted (for example, a hybrid vehicle, a plug-in hybrid vehicle, an electric vehicle, or the like). When the regenerative electric power is supplied to the battery B from the load Lo (for example, a motor) of 4), the battery B is charged. Further, when the switch SW is in the conductive state and the power (for example, drive power to the motor) is supplied from the battery B to the load Lo, the battery B is discharged. In addition, as shown in FIG. 2, the after-charge voltage SOC (State Of Charge) obtained from the SOC-OCV curve is defined as OCV (Open Circuit Voltage), which is the voltage after being left for a predetermined time from the time t1 to the time t2 after the end of charging. ) Is calculated. Similarly, the pre-charge SOC is calculated from the SOC-OCV curve with the post-leaving voltage obtained after standing for a predetermined time from the time t1 'before the start of charging to the time t2' as OCV. FIG. 2 is a diagram showing the relationship between the voltage [V] and the current [A] of the battery B and the time [sec].

  The SOC indicates the ratio (charging rate) [%] of the current capacity of the battery B to the full charge capacity of the battery B. Further, the SOC-OCV curve is acquired by, for example, an experiment or a simulation, and it is assumed that the SOC-OCV curve is acquired after a predetermined time elapses after the charging or discharging of the battery B is completed.

  The current detection unit 1 shown in FIG. 1 is composed of, for example, a Hall element or a shunt resistor, and detects the current I [A] flowing in the battery B.

  The voltage detection unit 2 is composed of, for example, an IC (Integrated Circuit), and detects the voltage [V] of the battery B.

  The storage unit 3 includes, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory), and has an SOC-OCV curve and a previously corrected full charge capacity (hereinafter referred to as “previously corrected full charge capacity”). ), A full charge capacity lowering line and the like described later are stored. SOC represents the ratio (charging rate) [%] of the current capacity of battery B to the full charge capacity of battery B.

  The display unit 4 is composed of, for example, a liquid crystal display or an organic EL (Electro-Luminescence) display.

  The controller 5 illustrated in FIG. 1 is configured by, for example, a CPU (Central Processing Unit), a multi-core CPU, or a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), or the like). For example, the controller 5 is realized by a CPU, a multi-core CPU, or a programmable device executing a program stored in the storage unit 3 or the like.

  As shown in FIG. 2, the controller 5 is the result of subtracting the SOC of the battery B before charging (SOC before charging) [%] from the SOC of the battery B after charging (SOC after charging) [%]. The charging rate difference value and the integrated current value [Ah] which is the integrated value of the current flowing through the battery B being charged are calculated. Then, the controller 5 estimates the result of dividing the calculated integrated current value [Ah] by the charging rate difference value as the full charge capacity [Ah] of the battery B. Specifically, the controller 5 estimates the full charge capacity [Ah] of the current battery B based on the following equation (1).

  Current full charge capacity [Ah] = current integrated value [Ah] / (charging rate [%] of battery B after completion of charging−charging rate [%] of battery B before starting charging) × 100 ... (1 )

  This "charging rate [%] of battery B after completion of charging-charging rate [%] of battery B before starting charging", that is, charging rate [%] of battery B after completion of charging and battery before starting charging The difference from the charging rate [%] of B is hereinafter referred to as ΔSOC (difference in charging rate, amount of change in charging rate).

  An error occurs in the full charge capacity [Ah] estimated this time by the equation (1) due to variations in battery voltage measurement error, battery temperature measurement error, battery current measurement error, and the like. Therefore, the controller 5 corrects the full charge capacity by substituting the full charge capacity currently estimated from ΔSOC in the expression (1) into the following expression (2) (first relational expression). As a result, the corrected full charge capacity is obtained.

  Current corrected full charge capacity [Ah] = Previous corrected full charge capacity [Ah] × first coefficient + ΔSOC full charge capacity [Ah] × second coefficient ... (2)

  The first coefficient and the second coefficient of the equation (2) are numbers that can be set arbitrarily between 0 and 1, and the sum of the first coefficient and the second coefficient is 1.

  The controller 5 estimates the SOC of the battery B based on the corrected full charge capacity [Ah] corrected by the equation (2) or the travelable distance (hereinafter, referred to as “the travelable distance” by which the vehicle can be driven by the motor). "EV distance"), charging time of the power storage device, and the like.

  For example, the controller 5 estimates the SOC of the battery B by substituting the corrected full charge capacity [Ah] corrected by the equation (2) into the following equation (3).

  SOC [%] = previous SOC [%] + (charge / discharge current integrated value [Ah] / corrected full charge capacity [Ah]) × 100 (3)

  In the formula (2), the integrated current value becomes a positive value in the case of charging, and the integrated current value becomes a negative value in the case of discharging.

  Further, the controller 5 calculates the EV distance by substituting the corrected full charge capacity [Ah] for this time corrected by the equation (2) into the following equation (4).

  EV distance [km] = electricity cost [km / KWh] × voltage [V] × corrected full charge capacity [Ah] × SOC (4)

  Further, the controller 5 substitutes the full charge capacity [Ah] corrected by the equation (2) into the following equation (5) to calculate the charging time of the battery B.

  Charging time [h] = ((SOC at full charge−SOC before start of charging) × full charge capacity after correction [Ah] this time) / charging current (A) (5)

  The controller 5 corrects the corrected full charge capacity [Ah] estimated by the equation (1) for each application by changing the ratio of the second coefficient in the equation (2) for each application. The second coefficient is a coefficient representing the strength of correction for the full charge capacity [Ah] estimated from the ΔSOC by the controller 5.

  Specifically, when estimating the SOC of the battery B, the controller 5 increases the ratio of the second coefficient in the equation (2) more than in the case of calculating the EV distance, and the full charge estimated this time is set. Correct the capacity [Ah].

  For example, when estimating the SOC of the battery B, the controller 5 substitutes 0.8 for the first coefficient of equation (2), substitutes 0.2 for the second coefficient, and uses the equation (1) this time. Correct the estimated full charge capacity. On the other hand, when calculating the EV distance, the controller 5 substitutes 0.9 for the first coefficient of equation (2) and 0.1 for the second coefficient, and this time using equation (1). Correct the estimated full charge capacity.

  In addition, when calculating the charging time of the battery B, the controller 5 reduces the ratio of the second coefficient in the equation (2) as compared with the case of estimating the SOC of the battery B and calculating the EV distance, The full charge capacity [Ah] estimated this time is corrected by the equation (1). For example, when calculating the charging time of the battery B, the controller 5 substitutes 0.95 for the first coefficient and substitutes 0.05 for the second coefficient of the equation (2) to obtain the equation (1). Correct the full charge capacity estimated this time.

  FIG. 3 is a diagram showing a relationship between the full charge capacity [Ah] corrected for SOC estimation of the battery B, calculation of EV distance, and calculation of charging time of the battery B and the number of years [years]. In FIG. 3, the solid line indicates the full charge capacity [Ah] corrected for SOC estimation of the battery B, the alternate long and short dash line indicates the full charge capacity [Ah] corrected for EV distance calculation, and the broken line indicates the charging of the battery B. The relationship between the full charge capacity [Ah] corrected for time calculation and the number of years [years] is shown. The SOC of the battery B is used by the battery B for controlling regenerative electric power and discharging, or as a parameter that does not directly give the user a feeling of strangeness even if the SOC changes. Therefore, when correcting the full charge capacity [Ah] for SOC estimation of the battery B, the controller 5 uses the full charge capacity [Ah] estimated this time by the equation (1) as much as possible, as shown in FIG. Reflect and use.

  On the other hand, the EV distance and the charging time of the battery B are displayed on the display unit 4 and are used as parameters that can be directly visually recognized by the user. Therefore, a sudden change gives a feeling of strangeness to the user. Therefore, for such an application in which the user feels uncomfortable with such an excessive change, the second full coefficient of the equation (2) is reduced to largely reflect the corrected full charge capacity of the previous use. As a result, as shown in FIG. 3, when the full charge capacity [Ah] for EV distance calculation is corrected, there is an excess between the corrected full charge capacity of the previous time and the corrected full charge capacity of this time. It can be corrected smoothly so that the full charge capacity does not change. As a result, the change in EV distance can be smoothed.

  When the full charge capacity [Ah] for calculating the charging time of the battery B is corrected, the full charge capacity between the previous corrected full charge capacity and the current corrected full charge capacity becomes excessive. It can be corrected smoothly so that it does not change. As a result, the change in charging time can be smoothed. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Since the battery B is charged with the same current value if the chargers are the same, if the charging time required to charge the same amount of current changes, the user feels strange. On the other hand, the EV distance greatly changes depending on not only the full charge capacity but also the electricity cost. The electric power cost greatly changes depending on the outside temperature, the way of driving, and the road (suburb road, highway, urban area, etc.) on which the vehicle travels. Not likely to give.

  Therefore, when the controller 5 corrects the full charge capacity [Ah] for calculating the charging time of the battery B, the controller 5 calculates the formula (2) more than when correcting the full charge capacity [Ah] for calculating the EV distance. By reducing the ratio of the second coefficient of the above, the corrected full charge capacity of the previous time is largely reflected and used.

Therefore, when correcting the full charge capacity [Ah] for calculating the charging time, the full charge capacity should not be excessively changed between the previous corrected full charge capacity and the current corrected full charge capacity. Can be corrected. As a result, the change in charging time can be smoothed.
Thereby, as shown in FIG. 3, the full charge capacity [Ah] for calculating the charging time of the battery B is smoothly corrected so as not to change excessively compared with the full charge capacity [Ah] for calculating the EV distance. It Therefore, it is possible to realize accurate battery state estimation according to the application without giving the user a feeling of strangeness.

<Embodiment 2>
As the second embodiment, the controller 5 determines the current full charge capacity of the battery B based on the full charge capacity decrease line (hereinafter, referred to as “full charge capacity decrease line”) in which the full charge capacity decreases with time. presume. In this case, the controller 5 may correct the fully-charged capacity estimated this time based on the fully-charged capacity lowering line by the following expression (6) (third relational expression).

  This corrected full charge capacity [Ah] = (the difference Δm [Ah] between the full charge capacity [Ah] estimated this time based on the full charge capacity decrease line and the full charge capacity [Ah] estimated from ΔSOC ]) × third coefficient + full charge capacity estimated based on the line of decrease in full charge capacity [Ah] (6)

  The third coefficient of the equation (6) is a number that can be set by the ratio [%]. The full charge capacity [Ah] estimated from ΔSOC is the full charge capacity [Ah] estimated based on the equation (1) of the first embodiment. The method for estimating the full charge capacity [Ah] from ΔSOC is the same as that in the first embodiment, and thus the description thereof is omitted. Further, the method of substituting the equation (6) into the equations (3) to (5) to calculate the SOC, EV distance, and charging time of the battery B is also the same as that of the first embodiment, and therefore its explanation is omitted.

  FIG. 4 is a diagram showing an example of the full charge capacity lowering line L1 showing the relationship between the full charge capacity [Ah] and the aged time [year]. As shown in FIG. 4, in the full charge capacity decreasing line L1, the full charge capacity [Ah] decreases as the aging time [year] increases.

  For example, as shown in FIG. 4, the controller 5 estimates the current full charge capacity m1 [Ah] at the aged time t3 based on the full charge capacity decrease line L1. Similarly, the controller 5 estimates the full charge capacity m2 [Ah] from ΔSOC based on the equation (1) of the first embodiment. Then, the controller 5 calculates the difference Δm [Ah] between the full charge capacity m1 [Ah] estimated based on the full charge capacity decrease line L1 and the full charge capacity m2 [Ah] estimated from ΔSOC of the equation (1). To calculate. The controller 5 corrects the full charge capacity [Ah] estimated this time based on the full charge capacity decrease line L1 by substituting the calculated difference Δm [Ah] into the equation (6).

  Specifically, when estimating the full charge capacity for SOC estimation of the battery B, the controller 5 calculates the third coefficient of the third coefficient in the equation (6) more than when estimating the full charge capacity for EV distance calculation. The full charge capacity [Ah] estimated this time is corrected based on the full charge capacity lowering line by increasing the ratio. The third coefficient is a coefficient representing the strength of correction for the full charge capacity [Ah] estimated by the controller 5 based on the full charge capacity decrease line.

  For example, when estimating the SOC of the battery B, the controller 5 substitutes 20% into the third coefficient of the equation (6). On the other hand, when calculating the EV distance, the controller 5 substitutes 10% into the third coefficient of the equation (6).

  The SOC of the battery B is used by the battery B for controlling regenerative electric power and discharging, or as a parameter that does not directly give the user a feeling of strangeness even if the SOC changes. Therefore, when correcting the full charge capacity [Ah] for SOC estimation of the battery B, the controller 5 reflects the full charge capacity [Ah] estimated from ΔSOC of the equation (1) as much as possible and fully charges the battery B. Correction along the capacity reduction line is performed to reduce the full charge capacity over time.

  On the other hand, the EV distance and the charging time of the battery B are displayed on the display unit 4 and are used as parameters that can be directly visually recognized by the user. Therefore, a sudden change gives a feeling of strangeness to the user. Therefore, for an application in which the user feels uncomfortable with such an excessive change, the full charge capacity estimated based on the full charge capacity lowering line is greatly reflected by reducing the third coefficient of the equation (6). To use. Thereby, when correcting the full charge capacity [Ah] for EV distance calculation, the full charge capacity does not change excessively between the corrected full charge capacity of the previous time and the corrected full charge capacity of this time. It can be corrected smoothly. As a result, the change in EV distance can be smoothed.

  Further, when estimating the full charge capacity for calculating the charging time of the battery B, the controller 5 determines the ratio of the third coefficient in the equation (6) more than when estimating the full charge capacity for calculating the EV distance. The full charge capacity [Ah] estimated this time is corrected based on the reduced full charge capacity decrease line.

  For example, when calculating the charging time of the battery B, the controller 5 substitutes 5% into the third coefficient of the equation (6). On the other hand, when calculating the EV distance, the controller 5 substitutes 10% into the third coefficient of the equation (6).

  Thus, when correcting the full charge capacity [Ah] for calculating the charging time of the battery B, the controller 5 reflects the full charge capacity [Ah] estimated based on the full charge capacity decrease line as much as possible. , Along with the full charge capacity decrease line, the correction to decrease the full charge capacity with time is made.

  The charging time of the battery B is displayed on the display unit 4 and is used as a parameter that can be directly visually recognized by the user. Therefore, if the battery B suddenly changes, the user feels uncomfortable. Therefore, for an application in which the user feels uncomfortable with such an excessive change, the full charge capacity estimated based on the full charge capacity lowering line is greatly reflected by reducing the third coefficient of the equation (6). To use.

  Therefore, when correcting the full charge capacity [Ah] for calculating the charging time of the battery B, the controller 5 smoothly moves along the full charge capacity lowering line so that the estimated full charge capacity does not change excessively. Can be corrected. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  Since the battery B is charged with the same current value if the chargers are the same, if the charging time required to charge the same amount of current changes, the user feels strange. On the other hand, the EV distance greatly changes depending on not only the full charge capacity but also the electricity cost. Since the electric power consumption greatly changes depending on the outside temperature, the driving method, and the road on which the vehicle runs, the change in the EV distance is less likely to give the user a feeling of strangeness than the change in the charging time of the battery B.

  For this reason, when correcting the full charge capacity [Ah] for EV distance calculation, the controller 5 uses the third coefficient of the equation (6) as compared with the full charge capacity [Ah] for calculating the charging time of the battery B. Use it after reflecting it largely.

  Therefore, in the case of correcting the full charge capacity [Ah] for calculating the charging time of the battery B, the third coefficient is set to be smaller than that in the case of correcting the full charge capacity [Ah] for calculating the EV distance. The full charge capacity estimated based on the full charge capacity lowering line can be smoothly corrected along the full charge capacity lowering line so as not to change excessively.

  Therefore, when correcting the full charge capacity for EV distance calculation, the full charge capacity does not change excessively between the full charge capacity estimated from the full charge capacity decrease line and the full charge capacity corrected this time. It is possible to smoothly correct along the line where the full charge capacity decreases. As a result, the change in charging time can be smoothed. As a result, accurate battery state estimation can be realized according to the application without giving the user a feeling of strangeness.

  When the controller 5 corrects the full charge capacity estimated this time based on the full charge capacity decrease line according to the equation (6), the correction of the full charge capacity estimated this time is based on the previously corrected full charge capacity. Even when the capacity is increased, the correction for increasing the full charge capacity is not performed.

  For example, if the corrected full charge capacity of this time, which is obtained as a result of the controller 5 correcting the full charge capacity based on the equation (6), is larger than the corrected full charge capacity of the previous time, it is Since it does not deteriorate, the user feels uncomfortable. Therefore, in such a case, the controller 5 can eliminate the discomfort of the user by not performing the correction for increasing the full charge capacity.

  In this case, for example, the controller 5 may make a correction to the same value as the previous full charge capacity, or may make a correction along the full charge capacity decrease line to decrease the full charge capacity with time.

<Another embodiment>
In the first embodiment described above, the full charge capacity estimated this time is corrected by substituting the full charge capacity estimated from ΔSOC by the equation (2) (first relational expression), but the present invention is not limited to this.

  For example, when estimating the full charge capacity for estimating the SOC of the battery B or for calculating the EV distance, the controller 5 is based on the equation (1), as in the first embodiment, based on the equation (1). Ah] is estimated. Then, similarly to the first embodiment, the controller 5 corrects the full charge capacity by substituting the full charge capacity estimated this time from ΔSOC in the expression (1) into the expression (2) (first relational expression). Then, the equation (2) is substituted into the equations (3) and (4) to calculate the SOC and EV distances of the battery B.

  On the other hand, when estimating the full charge capacity for calculating the charging time of the battery B, the controller 5 determines the current full charge capacity of the battery B based on the full charge capacity decrease line, as in the second embodiment. It may be estimated. In this case, as in the second embodiment, the controller 5 may correct the full charge capacity estimated this time based on the full charge capacity decrease line by the following expression (7) (second relational expression).

  This corrected full charge capacity [Ah] = (difference Δm [Ah] between the full charge capacity [Ah] estimated this time based on the full charge capacity decrease line and the full charge capacity estimated from ΔSOC) × Full charge capacity [Ah] ... (7) estimated this time based on the third coefficient + full charge capacity decrease line

  Then, the charging time is calculated by substituting the expression (7) into the expression (5).

  The equation (7) (second relational expression) of the present embodiment and the equation (6) (third relational expression) of the second embodiment are the same equation. The third coefficient of Expression (7) is the same as the third coefficient of the second embodiment. The full charge capacity lowering line of this embodiment is the same as the full charge capacity lowering line of the second embodiment. Further, the full charge capacity [Ah] estimated this time from ΔSOC is the full charge capacity [Ah] estimated based on the equation (1) of the first embodiment.

  When estimating the SOC of the battery B, the controller 5 makes the ratio of the second coefficient in the equation (2) larger than in the case of calculating the EV distance, and estimates this time, as in the first embodiment. Correct the full charge capacity [Ah].

  The SOC of the battery B is used by the battery B for controlling regenerative electric power and discharging, or as a parameter that does not directly give the user a feeling of strangeness even if the SOC changes. Therefore, when correcting the SOC estimation full charge capacity [Ah] of the battery B, the controller 5 reflects and uses the full charge capacity estimated this time by the equation (1) as much as possible. In addition, the EV distance greatly changes not only with the full charge capacity but also with the power consumption. Since the electric power consumption greatly changes depending on the outside temperature, the driving method, and the road on which the vehicle runs, the change in the EV distance is less likely to give the user a feeling of strangeness than the change in the charging time of the battery B.

  On the other hand, the charging time of the battery B is displayed on the display unit 4 and is used as a parameter that can be directly visually recognized by the user. Therefore, when the battery B suddenly changes, the user feels uncomfortable. Therefore, for an application in which the user feels uncomfortable with such an excessive change, the controller 5 calculates the corrected full charge capacity based on the full charge capacity decrease line by the formula (7). Accordingly, when the full charge capacity [Ah] for calculating the charging time of the battery B is corrected, the full charge capacity between the previous corrected full charge capacity and the current corrected full charge capacity is excessively increased. Can be smoothly corrected along the line where the full charge capacity decreases so as not to change. As a result, the change in the charging time of the battery B can be smoothed. Therefore, it is possible to realize accurate battery state estimation according to the application without giving the user a feeling of strangeness.

  In addition, when the controller 5 corrects the currently estimated full charge capacity based on the fully charged capacity decrease line by the formula (7), the controller 5 corrects the currently estimated full charge capacity similarly to the second embodiment. Even if is greater than the full charge capacity after the previous correction, the correction for increasing the full charge capacity is not performed.

  For example, if the corrected full charge capacity of this time, which is obtained as a result of the controller 5 correcting the full charge capacity based on the equation (7), becomes larger than the corrected full charge capacity of the previous time, it is Since it does not deteriorate, the user feels uncomfortable. Therefore, in such a case, the controller 5 can eliminate the discomfort of the user by not performing the correction for increasing the full charge capacity.

  In this case, for example, the controller 5 may make a correction to the same value as the previous full charge capacity, or may make a correction along the full charge capacity decrease line to decrease the full charge capacity with time.

  Further, the present invention is not limited to the above embodiment, and various improvements and changes can be made without departing from the gist of the present invention.

  In the second embodiment described above, the controller 5 estimates the full charge capacity [Ah] based on one full charge capacity decrease line L1 as shown in FIG. 4, but this is not the limitation. For example, the full charge capacity [Ah] may be estimated based on a plurality of full charge capacity decrease lines prepared for different purposes such as estimating the SOC of the battery B, calculating the EV distance, calculating the charging time of the battery B, and the like.

DESCRIPTION OF SYMBOLS 1 current detection part 2 voltage detection part 3 storage part 4 display part 5 controller 10 full charge capacity estimation result correction device B battery SW switch

Claims (7)

A power storage device that charges and discharges and outputs drive power of a motor that drives the vehicle,
While estimating the current full charge capacity of the power storage device,
This corrected full charge capacity = the previous corrected full charge capacity × the first coefficient + the full charge capacity estimated this time from the amount of change in the charge rate of the power storage device × the second coefficient It has a controller that corrects the full charge capacity estimated this time from the amount of change in the charging rate of the device,
The controller is
In the case of estimating the full charge capacity for estimating the charging rate of the power storage device, the first relation is more than in the case of estimating the full charge capacity for calculating the travelable distance that allows the vehicle to travel by the motor. A full charge capacity estimation result correction apparatus, wherein the ratio of the second coefficient in the equation is increased to correct the full charge capacity estimated this time. The controller further comprises
When estimating the full charge capacity for calculating the charging time of the power storage device, the first relationship is more important than when estimating the full charge capacity for calculating the travelable distance that allows the vehicle to travel by the motor. The full charge capacity estimation result correction apparatus according to claim 1, wherein the full charge capacity estimated this time is corrected by reducing the ratio of the second coefficient in the equation. When the controller further estimates the full charge capacity for calculating the charging time of the power storage device,
Corrected full charge capacity = (Full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases with the passage of time and the full charge estimated from the amount of change in the charging rate of the power storage device. Capacity difference) × third coefficient + full charge capacity decreases according to aging time, based on the full charge capacity decrease line, the second relational expression of the full charge capacity estimated this time is used to calculate the full charge capacity according to the aging time. The full charge capacity estimation result correction device according to claim 1, wherein the full charge capacity estimated this time is corrected based on a full charge capacity decrease line where The controller further comprises
In the case of correcting the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases with the lapse of time by the second relational expression,
The full charge according to claim 3, wherein the correction to increase the full charge capacity is not performed even when the correction of the full charge capacity estimated this time increases more than the corrected full charge capacity of the previous time. Capacity estimation result correction device. A power storage device that charges and discharges and outputs drive power of a motor that drives the vehicle,
While estimating the current full charge capacity of the power storage device based on the full charge capacity decrease line where the full charge capacity decreases with time,
Current corrected full charge capacity = (Estimated from the full charge capacity estimated this time based on the full charge capacity decrease line where the full charge capacity decreases with the lapse of time and the amount of change in the charging rate of the power storage device. (Difference between full charge capacity) × third coefficient + the third relational expression of the full charge capacity estimated this time based on the full charge capacity decrease line where the full charge capacity decreases due to the aged time, It has a controller that corrects the full charge capacity estimated this time based on the full charge capacity decrease line where the full charge capacity decreases,
The controller is
In the case of estimating the full charge capacity for estimating the charging rate of the power storage device, the third relation is more than in the case of estimating the full charge capacity for calculating the travelable distance at which the motor can drive the vehicle. The full charge capacity estimation result characterized by increasing the ratio of the third coefficient in the equation to correct the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases due to the aged time. Correction device. The controller further comprises
In the case of estimating the full charge capacity for calculating the charging time of the power storage device, the third relation is more than in the case of estimating the full charge capacity for calculating the travelable distance that allows the vehicle to travel by the motor. The full-charge capacity estimated this time is corrected based on the full-charge capacity decrease line in which the full-charge capacity decreases with the lapse of time by reducing the ratio of the third coefficient in the equation. Full charge capacity estimation result correction device. The controller further comprises
In the case of correcting the full charge capacity estimated this time based on the full charge capacity decrease line in which the full charge capacity decreases with the lapse of time by the third relational expression,
The correction for increasing the full charge capacity is not performed even if the correction of the full charge capacity estimated this time increases more than the corrected full charge capacity of the previous time. Full charge capacity estimation result correction device.

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