JP2012200075A - Control device for secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a secondary battery preventing the secondary battery from being input/output power beyond a power performance the secondary battery should have without deteriorating an actual power performance of the secondary battery within a reference period.SOLUTION: A reference time point is set as a time point where a reference period elapses from a start of a battery usage. When a deteriorated internal resistance value Rtyp of a battery is less than a reference resistance value RT that is an internal resistance value at the reference time point, a control circuit for controlling actual input/output power to/from a battery sets a value, corresponding to a reference power performance that is a battery performance at the reference time point, as an input/output control value Sw. When the deteriorated internal resistance value Rtyp is greater than the reference resistance value RT, the control circuit sets a value corresponding to a power performance the secondary battery should have as the input/output control value Sw. The actual input/output power of the battery is controlled not to exceed the input/output control value Sw thus being set.

Description

  The present invention relates to a technique for limiting input / output power of a secondary battery.

  Japanese Patent Laid-Open No. 2010-16156 (Patent Document 1) discloses a method of detecting an internal resistance value of a secondary battery in a vehicle equipped with a secondary battery, and presenting the current state of the secondary battery based on the detected internal resistance value. By determining the degree of deterioration and limiting the discharge of the secondary battery when the determined current degree of deterioration exceeds a predetermined value, the progress of the deterioration of the secondary battery is made without affecting the driving performance of the vehicle as much as possible. A technique for suppressing the above is disclosed.

JP 2010-16156 A JP 2009-123435 A JP 2008-24124 A

  By the way, it is assumed that the vehicle is used for a long time. Therefore, it is desirable to preliminarily assume the usage period of the vehicle and maintain the actual power performance of the secondary battery so as not to affect the running performance of the vehicle at least during the assumed usage period.

  However, since the technique of Patent Document 1 starts limiting the discharge of the secondary battery from the time when the condition that the current deterioration degree exceeds a predetermined value is satisfied, the performance of the secondary battery is also determined by the process. As a result, even if it is within the assumed period of use, a decrease in performance due to deterioration of the secondary battery may affect the running performance of the vehicle.

  The present invention has been made to solve the above-described problems, and its purpose exceeds the original power performance without degrading the actual power performance of the secondary battery within the assumed period of use. This is to prevent electric power from being input to and output from the secondary battery.

  The control device according to the present invention controls a secondary battery whose power performance is lowered in accordance with deterioration. The control device includes a deterioration degree calculation unit that calculates the actual deterioration degree of the secondary battery, and a control unit that controls the actual input / output power of the secondary battery. The control unit limits the actual input / output power according to the power performance of the secondary battery at the reference time before the reference time, using the time when the reference period has elapsed from the start of use of the secondary battery as the reference time. After the time, the actual input / output power is limited according to the actual deterioration degree.

  Preferably, the control device further includes a storage unit that preliminarily stores the deterioration degree of the secondary battery at the reference time point as the reference deterioration degree. The controller limits the actual input / output power so that it does not exceed the power equivalent to the input / output power of the secondary battery at the reference time before the actual deterioration level exceeds the reference deterioration level. After exceeding the degree, the actual input / output power is limited so as not to exceed the input / output possible power of the secondary battery at the time of calculating the actual deterioration degree.

  Preferably, the control unit includes a limit value calculation unit that calculates an input / output power limit value of the secondary battery, and a limit unit that limits the actual input / output power so as not to exceed the input / output power limit value. The limit value calculation unit sets the input / output power limit value to a substantially constant value corresponding to the input / output power of the secondary battery at the reference time before the actual deterioration level exceeds the reference deterioration level. After exceeding, the input / output power limit value is lowered as the actual deterioration degree increases.

  Preferably, after the actual deterioration level exceeds the reference deterioration level, the limit value calculation unit calculates the amount of decrease in input / output possible power of the secondary battery from the start of use to the reference time and the input / output power limit value from the start of use. The input / output power limit value is calculated so that the ratio of the amount of decrease in input / output possible power of the secondary battery up to the calculated time point is equal to the ratio between the reference deterioration level and the actual deterioration level.

  Preferably, the limit value calculating unit calculates a temporary input / output power limit value according to the storage amount and temperature of the secondary battery, and a second calculation for calculating the deterioration coefficient based on the actual deterioration degree. And a correction unit that sets a value obtained by multiplying the provisional input / output power limit value by the degradation coefficient to set the formal input / output power limit value. Before the actual deterioration degree exceeds the reference deterioration degree, the second calculation unit sets the deterioration coefficient to a constant value corresponding to the input / output power of the secondary battery at the reference time, and the actual deterioration degree exceeds the reference deterioration degree. Thereafter, as the actual deterioration degree is larger, the deterioration coefficient is lowered.

  Preferably, the deterioration degree calculation unit calculates an internal resistance value of the secondary battery based on the voltage and current of the secondary battery, and calculates a value obtained by subjecting the internal resistance value to the first-order lag processing as the actual deterioration degree.

  According to the present invention, the actual power performance (allowable input / output power determined by the state of the secondary battery) is obtained without degrading the actual power performance of the secondary battery within the reference period (control value of actual input / output power). ) Can be prevented from being input / output to / from the secondary battery.

1 is a block diagram illustrating a schematic configuration of a vehicle. It is a figure which shows the structure of a battery, a temperature sensor, a voltage sensor, and a current sensor. It is a functional block diagram of a control circuit. It is a figure which shows the change aspect of internal resistance R and deterioration internal resistance value Rtyp. It is a figure which shows the relationship between an actual deterioration degree, the deterioration internal resistance value Rtyp, and the deterioration coefficient K. FIG. It is a figure which shows the relationship between an actual deterioration degree, the deterioration internal resistance value Rtyp, and the input-output limiting value Sw. It is a flowchart which shows the process sequence of a control circuit.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the following, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated in principle.

  FIG. 1 is a block diagram illustrating a schematic configuration of a vehicle 5 including a secondary battery control device according to the present embodiment. Although the vehicle 5 shown in FIG. 1 is a so-called hybrid vehicle, the present invention is not limited to the hybrid vehicle, and can be applied to all vehicles equipped with a secondary battery.

  Referring to FIG. 1, vehicle 5 includes a battery 10, system main relays 22 and 24, a power control unit (hereinafter referred to as “PCU”) 30, motor generators 41 and 42, and an engine 50. , A power split mechanism 60, a drive shaft 70, and wheels 80.

  The battery 10 includes a lithium ion secondary battery that stores electric power for driving the motor generators 41 and 42. The battery 10 is configured by connecting a plurality of battery cells in series.

  The engine 50 outputs kinetic energy by the combustion energy of fuel. Power split device 60 is connected to motor generators 41 and 42 and the output shaft of engine 50, and drives drive shaft 70 by the output of motor generator 42 and / or engine 50. The wheels 80 are rotated by the drive shaft 70. As described above, the vehicle 5 travels by the output of the engine 50 and / or the motor generator 42.

  Although the motor generators 41 and 42 can function as both a generator and an electric motor, the motor generator 41 mainly operates as a generator, and the motor generator 42 mainly operates as an electric motor.

  Specifically, the motor generator 41 is used as a starter that starts the engine 50 when an engine start request is made, such as during acceleration. At this time, the motor generator 41 receives power supplied from the battery 10 via the PCU 30 and drives as an electric motor, and cranks and starts the engine 50. Further, after the engine 50 is started, the motor generator 41 is rotated by the engine output transmitted through the power split mechanism 60 and can generate electric power.

  Motor generator 42 is driven by at least one of the electric power stored in battery 10 and the electric power generated by motor generator 41. The driving force of the motor generator 42 is transmitted to the driving shaft 70. As a result, the motor generator 42 assists the engine 50 to cause the vehicle 5 to travel, or causes the vehicle 5 to travel only by its own driving force.

  Further, at the time of regenerative braking of the vehicle 5, the motor generator 42 operates as a generator by being driven by the rotational force of the wheels. At this time, the regenerative power generated by the motor generator 42 is charged to the battery 10 via the PCU 30.

  The PCU 30 performs bidirectional power conversion between the battery 10 and the motor generators 41 and 42, and the motor generators 41 and 42 are operated so as to operate according to their operation command values (typically torque command values). Control power conversion. For example, PCU 30 includes an inverter that converts DC power from battery 10 into AC power and applies it to motor generators 41 and 42. This inverter can also convert the regenerative power generated by the motor generators 41 and 42 into DC power and charge the battery 10.

  System main relays 22 and 24 are provided between PCU 30 and battery 10. The system main relays 22 and 24 are turned on / off in response to the relay control signal SE. When the system main relays 22 and 24 are turned off (opened), the charge / discharge path of the battery 10 is mechanically interrupted.

  The vehicle 5 further includes a monitoring unit 20 for monitoring the battery 10 and a control circuit 100.

  The monitoring unit 20 monitors the detection results of the temperature sensor 12, the voltage sensor 14 and the current sensor 16 provided in the battery 10 and outputs them to the control circuit 100. In FIG. 1, the temperature sensor 12 and the voltage sensor 14 are comprehensively shown, but actually, as shown in FIG. 2 described later, a plurality of the temperature sensors 12 and the voltage sensors 14 are provided.

  FIG. 2 is a diagram illustrating configurations of the battery 10, the temperature sensor 12, the voltage sensor 14, and the current sensor 16.

  The battery 10 is configured by connecting n (n: an integer greater than or equal to 2) battery blocks 11 in series. FIG. 2 illustrates the configuration in the case of n = 4. Each battery block 11 is configured by connecting a plurality of battery cells 10a in series.

  The temperature sensor 12 is provided for each battery block 11. FIG. 2 illustrates a configuration in which one temperature sensor 12 is provided for each battery block 11, but a plurality of temperature sensors 12 may be provided for each battery block 11. . Each temperature sensor 12 detects the temperature of the place where each is installed as the battery temperature Tb.

  One voltage sensor 14 is provided for each battery block 11. Each voltage sensor 14 detects a block voltage Vb (Vb1 to Vbn) that is a voltage between both ends of each battery block 11. FIG. 2 illustrates a configuration in which each battery block 11 detects the block voltages Vb1 to Vb4, respectively.

  The current sensor 16 detects a battery current Ib that is a current flowing through the battery 10. A plurality of current sensors 16 may be provided.

  The detection results of each temperature sensor 12, each voltage sensor 14, and current sensor 16 are transmitted to the control circuit 100 via the monitoring unit 20.

  Returning to FIG. 1, the control circuit 100 includes a CPU (Central Processing Unit) (not shown) and an electronic control unit (ECU: Electronic Control Unit) with a built-in memory. The control circuit 100 stores the detection results of each sensor and the memory. Based on the information and the like, a predetermined calculation process is executed.

  The control circuit 100 sets a torque request value for the motor generators 41 and 42 based on the user's accelerator operation amount and vehicle speed. The control circuit 100 controls the power conversion by the PCU 30 so that the motor generators 41 and 42 operate according to the torque request value. The engine 50 is controlled by another ECU (not shown). In FIG. 1, the control circuit 100 is described as a single unit, but may be two or more separate units.

  In the vehicle 5 having the above-described configuration, the usage period of the battery 10 (the usage period of the vehicle 5) is assumed to be a relatively long period exceeding, for example, 10 years. A secondary battery such as the battery 10 deteriorates with use, and the original power performance (input power and output power determined by the state of the secondary battery) decreases according to the degree of deterioration.

  Therefore, the control circuit 100 sets the assumed use period of the battery 10 as the reference period T (for example, the reference period T = 10 years), and the actual power performance (actual input / output power) of the battery 10 within the reference period T. In order to make the control allowable value) substantially constant, the original power performance at the reference time point (hereinafter referred to as “reference time point”) before the time point when the reference period T elapses from the start of use of the battery 10 (hereinafter referred to as “reference time point”). The actual input / output power of the battery 10 is limited so as not to exceed the power corresponding to “power performance”. On the other hand, since the original power performance is lower than the reference power performance after the reference time, if the actual input / output power is limited by the power equivalent to the reference power performance, the actual input / output power will exceed the original power performance. Therefore, the battery 10 may not be properly protected. Therefore, after the reference time, the control circuit 100 limits the actual input / output power with power corresponding to the original power performance.

  Hereinafter, a method of power limit control by the control circuit 100 will be specifically described. In the following, in order to appropriately reflect the actual deterioration level of the battery 10 by the power limit control, an internal resistance value of the battery 10 is obtained as a parameter indicating the actual deterioration level of the battery 10, and this internal resistance value is stored in advance. A case where the power limitation is performed will be described as an example in which the case where the internal resistance value is smaller than the reference time is “before the reference time”, and the case where it is not “after the reference time”.

  FIG. 3 is a functional block diagram of the control circuit 100. Each functional block shown in FIG. 3 may be realized by hardware or software.

  The control circuit 100 includes a deterioration degree calculation unit 110, a deterioration coefficient calculation unit 120, storage units 130 and 131, a basic limit value calculation unit 140, a correction unit 150, and a limit unit 160.

  The deterioration degree calculation unit 110 calculates a deterioration internal resistance value Rtyp based on the usage history of the battery 10. The deteriorated internal resistance value Rtyp is used as a parameter indicating the actual deterioration degree of the battery 10.

  FIG. 4 is a diagram showing how the actual internal resistance R and the deteriorated internal resistance value Rtyp of the battery 10 change. The internal resistance of the battery 10 increases relatively slowly as the deterioration of the battery 10 progresses. Since the deterioration of the battery 10 proceeds according to the usage time (the number of years of use), the internal resistance of the battery 10 increases relatively slowly according to the usage time. However, since the actual internal resistance R varies depending on the traveling state of the vehicle 5, it changes relatively abruptly. In order to reduce the influence of fluctuation due to running conditions and appropriately grasp the increase in internal resistance due to deterioration, the deterioration degree calculation unit 110 sets the actual internal resistance R to a long period (for example, 10 years) according to a reference period T (for example, 10 years) A value (a value obtained by performing a first-order lag process) obtained from several months to several years) is defined as a deteriorated internal resistance value Rtyp. Specifically, the deteriorated internal resistance value Rtyp is periodically calculated by the following equation (1).

Rtyp (current value) = α · Rtyp (previous value) + (1−α) · R (1)
Here, “α” is an annealing constant. By adjusting the annealing constant α to a value corresponding to a long period of about several months to several years, the deterioration internal resistance value Rtyp is a value from which the influence of fluctuation due to the running state is removed, that is, the internal resistance value due to deterioration. A value close to. As the actual internal resistance R, for example, the maximum value among the actual internal resistances R of each battery block 11 obtained by dividing each block voltage Vb by the battery current Ib according to Ohm's law may be used.

  Returning to FIG. 3, the storage unit 130 stores in advance a reference resistance value RT (internal resistance value at a reference time point) determined in advance through experiments or the like. The storage unit 131 stores a deterioration coefficient map in which a correspondence relationship between the deterioration internal resistance value Rtyp and the deterioration coefficient K is determined in advance. The deterioration coefficient K is used for calculating an input / output limit value Sw described later. The deterioration coefficient calculation unit 120 reads the reference resistance value RT and the deterioration coefficient map from the storage units 130 and 131, and calculates the deterioration coefficient K corresponding to the deterioration internal resistance value Rtyp.

  FIG. 5 is a diagram schematically showing the relationship between the actual deterioration degree, the deterioration internal resistance value Rtyp, and the deterioration coefficient K. The upper diagram in FIG. 5 corresponds to a deterioration coefficient map.

  The actual deterioration degree and the deterioration internal resistance value Rtyp are in a proportional relationship (see the lower diagram in FIG. 5). Therefore, if the deterioration coefficient K is made to correspond to the original power performance, the deterioration coefficient K is as shown by a one-dot chain line in FIG. However, in the present embodiment, the deterioration coefficient K is fixed to a value (“1” in FIG. 5) corresponding to the reference power performance in a range where the deterioration internal resistance value Rtyp is smaller than the reference resistance value RT.

  On the other hand, in the range where the deterioration internal resistance value Rtyp exceeds the reference resistance value RT, the deterioration coefficient K is set to a value corresponding to the original power performance. That is, assuming that the value of the degradation coefficient K corresponding to the original power performance at the start of use is “Kmax”, the degradation coefficient K is (Kmax−1) :( Kmax−K) = (in the range of Rtyp> RT. The degree of deterioration at the reference time point is set so that the relationship of (actual deterioration degree) = (RT) :( Rtyp) is satisfied (A: B = C: D in FIG. 5).

  Returning to FIG. 3, the basic limit value calculation unit 140 is based on the storage amount SOC of the battery 10 and the temperature Tb, and is based on the basic limit value Swbase (basic value) that is a source value (provisional value) of the input / output limit value Sw. An input limit value Swinbase and a basic output limit value Swoutbase) are calculated. The basic limit value Swbase is a value obtained by correcting a value corresponding to the reference power performance according to the current storage amount SOC and the temperature Tb. As a specific calculation method, for example, a map in which the correspondence relationship between the storage amount SOC and temperature Tb and the basic limit value Swbase is stored in advance, and this map is used to correspond to the current storage amount SOC and temperature Tb. What is necessary is just to obtain | require the basic | foundation limiting value Swbase to perform.

  The correction unit 150 corrects the basic limit value Swbase using the deterioration coefficient K, and sets the corrected value as the input / output limit value Sw (the input limit value Swin and the output limit value Swout). Specifically, as shown in the following formula (2), a value obtained by multiplying the basic limit value Swbase by the deterioration coefficient K is set as the input / output limit value Sw.

Swin = Swinbase · K, Swout = Swoutbase · K (2)
Limiting unit 160 prevents the actual input / output power of battery 10 from exceeding input / output limit value Sw (so that actual input power and actual output power do not exceed input limit value Swin and output limit value Swout, respectively). To control.

  FIG. 6 is a diagram schematically showing the relationship between the actual deterioration level, the deteriorated internal resistance value Rtyp, and the input / output limit value Sw.

  As shown in FIG. 6, in a range where the deteriorated internal resistance value Rtyp is smaller than the reference resistance value RT, the deterioration coefficient K is set to “1” (see FIG. 5), and the input / output limit value Sw is set to the basic limit value Swbase (ie, the reference value). (Value corresponding to power performance). Therefore, even if the original power performance is larger than the reference power performance, the actual input / output power is limited to a value corresponding to the reference power performance. If the power in the range that exceeds the reference power performance but does not exceed the original power performance (shaded area in FIG. 6) is used, as shown by the alternate long and short dash line, even though the battery 10 can be temporarily prevented from being deteriorated due to overvoltage. Since the deterioration proceeds at an early stage, the reference power performance cannot be ensured when the reference time is actually reached in the future. On the other hand, in the present embodiment, the use of the power in the shaded area in FIG. 6 is restricted, so that the early progress of deterioration is suppressed and the actual power performance of the battery 10 is maintained at a value corresponding to the reference power performance. can do. In addition, the life of the battery 10 is prolonged. In addition, if the specification of the battery 10 is set so that the reference power performance is at least a value that can secure the power performance of the motor generators 41 and 42, the running performance of the vehicle 5 in the reference period T is sufficiently secured. be able to.

  On the other hand, in the range where the deteriorated internal resistance value Rtyp exceeds the reference resistance value RT, the original power performance is lower than the reference power performance (= basic limit value Swbase). In consideration of this point, in this embodiment, the deterioration coefficient K (see FIG. 5) is used to correct the deterioration coefficient K to a value smaller than 1, and the output limit value Swout is set to a value corresponding to the original power performance. Match. As a result, the actual input / output power is limited to a value equal to or less than the value corresponding to the original power performance, so that the actual power performance and the original power performance can be matched. Therefore, it is possible to appropriately prevent the battery 10 from being overpowered (power that exceeds the original power performance is input / output to the battery 10) even after the reference time point.

  In FIG. 6, for convenience of explanation, the input limit value Swin and the output limit value Swout are set as the input / output limit value Sw without distinguishing them. However, the input limit value Swin and the output limit value Swout are actually different values. It is normal to become. Further, in FIG. 6, the basic limit value Swbase is a constant value for convenience of explanation, but actually, the basic limit value Swbase also varies according to variations in the storage amount SOC and the temperature Tb.

  FIG. 7 is a flowchart showing a processing procedure of the control circuit 100 for realizing the above-described function.

  In step (hereinafter, step is abbreviated as “S”) 10, control circuit 100 calculates actual internal resistance R using each block voltage Vb and battery current Ib.

  In S11, the control circuit 100 performs the above-described annealing process on the actual internal resistance R calculated in the current cycle (see the above formula (1)) to calculate the deteriorated internal resistance value Rtyp.

  In S12, control circuit 100 calculates deterioration coefficient K corresponding to deterioration internal resistance value Rtyp using the deterioration coefficient map (see FIG. 5).

  In S13, control circuit 100 calculates basic limit value Swbase (basic input limit value Swinbase and basic output limit value Swoutbase) based on storage amount SOC of battery 10 and temperature Tb.

  At S14, control circuit 100 calculates a value obtained by multiplying basic limit value Swbase by deterioration coefficient K as input / output limit value Sw. Specifically, values obtained by multiplying each of the basic input limit value Swinbase and the basic output limit value Swoutbase by the deterioration coefficient K are calculated as the input limit value Swin and the output limit value Swout, respectively (see the above formula (2)). .

  In S15, control circuit 100 limits the actual input power and the actual output power of battery 10 so as not to exceed input limit value Swin and output limit value Swout.

  As described above, the control circuit 100 according to the present embodiment sets the time point when the reference period T has elapsed from the start of use of the battery 10 as the reference time point before the reference time point (specifically, the deteriorated internal resistance value Rtyp). Is smaller than the reference resistance value RT), the actual input / output power of the battery 10 is limited so as not to exceed the power performance at the reference time, and after the reference time (specifically, the deteriorated internal resistance value Rtyp is When the resistance value is larger than the reference resistance value RT), the actual input / output power of the battery 10 is limited so as not to exceed the original power performance. Therefore, it is possible to prevent power exceeding the original power performance from being input / output to / from the battery 10 while maintaining the actual power performance of the battery 10 within the reference period substantially constant without degrading.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  5 Vehicle, 10 Battery, 10a Battery cell, 11 Battery block, 12 Temperature sensor, 14 Voltage sensor, 16 Current sensor, 20 Monitoring unit, 22, 24 System main relay, 41, 42 Motor generator, 50 Engine, 60 Power split mechanism , 70 drive shaft, 80 wheels, 100 control circuit, 110 deterioration degree calculating unit, 120 deterioration coefficient calculating unit, 130, 131 storage unit, 140 basic limit value calculating unit, 150 correcting unit, 160 limiting unit.

Claims (6)

A control device for a secondary battery whose power performance is reduced in accordance with deterioration,
A deterioration degree calculation unit for calculating an actual deterioration degree of the secondary battery;
A control unit for controlling the actual input / output power of the secondary battery,
The control unit sets a time point when a reference period has elapsed from the start of use of the secondary battery as a reference time point, and before the reference time point, the actual input / output according to the power performance of the secondary battery at the reference time point A control device for a secondary battery, which limits power and limits the actual input / output power according to the actual deterioration degree after the reference time. The control device further includes a storage unit that preliminarily stores a deterioration degree of the secondary battery at the reference time point as a reference deterioration degree,
The control unit limits the actual input / output power so as not to exceed the power corresponding to the input / output possible power of the secondary battery at the reference time before the actual deterioration level exceeds the reference deterioration level, The actual input / output power is limited so as not to exceed the input / output possible power of the secondary battery at the time when the actual deterioration degree is calculated after the actual deterioration degree exceeds the reference deterioration degree. The control apparatus of the secondary battery as described in. The controller is
A limit value calculation unit for calculating an input / output power limit value of the secondary battery;
A limiting unit that limits the actual input / output power so as not to exceed the input / output power limit value,
The limit value calculation unit sets the input / output power limit value to a substantially constant value corresponding to the input / output possible power of the secondary battery at the reference time before the actual deterioration level exceeds the reference deterioration level, 3. The secondary battery control device according to claim 2, wherein after the actual deterioration level exceeds the reference deterioration level, the input / output power limit value is decreased as the actual deterioration level increases. 4.   After the actual deterioration level exceeds the reference deterioration level, the limit value calculation unit is configured to reduce the amount of power that can be input / output from the secondary battery from the start of use to the reference time point, and from the start of use to the input. The input / output power limit value so that the ratio of the reduction amount of input / output power of the secondary battery up to the time when the output power limit value is calculated is equal to the ratio of the reference deterioration level and the actual deterioration level. The control device for a secondary battery according to claim 3, wherein The limit value calculation unit includes:
A first calculation unit that calculates the provisional input / output power limit value according to a storage amount and temperature of the secondary battery;
A second calculation unit for calculating a deterioration coefficient based on the actual deterioration degree;
A correction unit that sets a value corrected by multiplying the provisional input / output power limit value by the deterioration coefficient to the formal input / output power limit value,
The second calculation unit sets the deterioration coefficient to a constant value corresponding to the input / output possible power of the secondary battery at the reference time before the actual deterioration degree exceeds the reference deterioration degree, and the actual deterioration degree 4. The secondary battery control device according to claim 3, wherein after the reference deterioration degree is exceeded, the deterioration coefficient is decreased as the actual deterioration degree is larger. 5.   The deterioration degree calculation unit calculates an internal resistance value of the secondary battery based on the voltage and current of the secondary battery, and calculates a value obtained by performing a first-order lag process on the internal resistance value as the actual deterioration degree. The control apparatus of the secondary battery of Claim 1.

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