JP2018021837A - Device and method for determining deterioration of secondary battery, and device for controlling secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a device for determining the deterioration of a secondary battery, capable of determining the deterioration of an alkaline secondary battery even when non-quantitative charge and discharge are repeated; a method for determining the deterioration of the secondary battery used for the device; and a device for controlling the secondary battery used for the device.SOLUTION: A determination device 30 for determining the deterioration of a battery 10 repeating non-quantitative charge and discharge comprises: a dSOC calculation part 44 for calculating a dSOC being the variation of SOC for each increase or decrease about increase or decrease generated in the SOC of the battery 10; a deterioration amount calculation part 45 for calculating the amount of deterioration of the battery 10 on the basis of the dSOC and information showing the amount of deterioration of the battery 10 corresponding to the dSOC; and a deterioration determining output part 46 for accumulating the calculated amount of deterioration and determining the deterioration of the battery 10 on the basis of the accumulated amount of deterioration. Information showing that the amount of deterioration of the battery 10 is larger as the dSOC is larger is set as the information showing the amount of deterioration of the battery 10 corresponding to the variation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a deterioration determination device for a secondary battery for determining deterioration of a secondary battery, a method for determining deterioration of a secondary battery used in the device, and a control device for a secondary battery using the device.

  As power sources for vehicles such as electric vehicles and hybrid vehicles, nickel hydride secondary batteries and lithium ion secondary batteries are used because of their high energy density. These secondary batteries normally constitute a battery pack as an assembled battery obtained by combining a plurality of battery modules composed of a plurality of single cells.

  By the way, the secondary battery is charged and discharged in accordance with the charge characteristics and discharge characteristics that differ depending on the type of battery. For example, as a charging characteristic of an alkaline secondary battery such as a nickel metal hydride secondary battery, it is known that rapid charging increases polarization and increases a charging voltage, thereby causing deterioration of the secondary battery. Therefore, in order to extend the battery life of the alkaline secondary battery, it is important to reduce the deterioration of the secondary battery due to charging. For example, Patent Document 1 discloses a technique that enables rapid charging while reducing deterioration during charging of a nickel-hydrogen secondary battery.

  The technique described in Patent Document 1 is a technique for charging a nickel-hydrogen secondary battery by an intermittent charging operation. In the intermittent charging operation, the charging current is lowered according to a parameter indicating the charging state of the nickel hydride secondary battery obtained from the terminal voltage of the nickel hydride secondary battery every time the charging operation is stopped. Here, the parameter indicating the state of charge is the polarization voltage, and the subsequent charge is performed by reducing the charge current in response to the change of the polarization voltage with time passing through the minimum point for the first time.

Japanese Patent Laying-Open No. 2015-104139

According to the technique described in Patent Document 1, rapid charging can be performed while reducing deterioration of the nickel-hydrogen secondary battery.
By the way, if the alkaline secondary battery is the above-described on-vehicle power source or the like, discharge and charge are often repeated irregularly and in a short cycle at irregular intervals. There is a risk that information necessary for prevention of deterioration cannot be obtained. If the information necessary for preventing the deterioration cannot be obtained, the deterioration of the alkaline secondary battery cannot be determined.

  The present invention has been made in view of such circumstances, and the purpose thereof is a secondary battery deterioration determination device capable of determining deterioration of an alkaline secondary battery even when indefinite amount of charge and discharge is repeated. Another object of the present invention is to provide a method for determining deterioration of a secondary battery used in the device, and a control device for a secondary battery used in the device.

  A secondary battery deterioration determination device that solves the above problem is a secondary battery deterioration determination device that determines deterioration of an alkaline secondary battery that is repeatedly charged and discharged indefinitely, wherein the state of charge of the alkaline secondary battery is determined. A change amount calculation unit that calculates a change amount of a charging state at each increase or decrease, an increase amount, and a decrease amount of the alkaline secondary battery corresponding to the change amount A deterioration amount calculation unit that calculates the deterioration amount of the alkaline secondary battery based on the information, a deterioration amount accumulation unit that accumulates the calculated deterioration amount, and the alkaline secondary battery based on the accumulated deterioration amount. A deterioration determination unit for determining deterioration, and as information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount, the deterioration amount of the alkaline secondary battery is larger as the change amount of the state of charge is larger. Information Characterized in that it is a constant.

  A secondary battery deterioration determination method that solves the above-described problem is a method used in a secondary battery deterioration determination device that determines deterioration of an alkaline secondary battery that is repeatedly charged and discharged indefinitely. For the increase or decrease that occurs in the state of charge of the battery, a change amount calculating step for calculating the amount of change in the charge state at each increase or decrease, the change amount, and an alkaline secondary battery corresponding to the change amount A deterioration amount calculating step of calculating a deterioration amount of the alkaline secondary battery based on information indicating the deterioration amount, a deterioration amount accumulating step of accumulating the calculated deterioration amount, and the alkali based on the accumulated deterioration amount. A deterioration determination step for determining deterioration of the secondary battery, and as information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount, the deterioration amount of the alkaline secondary battery as the change amount of the charge state increases. Characterized in that it is set information indicating that large.

  A control device for a secondary battery that solves the above problem is mounted on a vehicle that includes a motor in a drive device, and controls the charge and discharge of an alkaline secondary battery that is used as a power source for the motor. A deterioration determination device that determines deterioration of the alkaline secondary battery, and a change amount of the charge state when the charge state of the alkaline secondary battery increases or decreases according to the determination result of the deterioration determination device. And a charge / discharge control unit that controls charging and discharging of the alkaline secondary battery so that the battery is small, and the deterioration determination device is the deterioration determination device of the secondary battery described above.

  According to such a configuration or method, with respect to the alkaline secondary battery in use, the amount of change in the state of charge (SOC) indicating the amount of deterioration for each charge or discharge, and the remaining amount of charged electric power (SOC: State Of Charge) Is calculated based on the above and accumulated. Therefore, even if charging / discharging is repeated indefinitely, the deterioration of the alkaline secondary battery is determined based on the calculated deterioration amount. Thereby, overcharge and overdischarge of the alkaline secondary battery can be avoided, and management can be suitably performed.

  In addition, since it is possible to determine the deterioration during use of the alkaline secondary battery, it is possible to select a usage method in which the deterioration of the alkaline secondary battery is small. Therefore, it is possible to present information for extending the life of the alkaline secondary battery, or to control charging / discharging, and the convenience of using the alkaline secondary battery is improved.

As a preferred configuration, the deterioration determination unit determines that the alkaline secondary battery is deteriorated when the accumulated deterioration amount is larger than a predetermined determination value.
According to such a configuration, the deterioration of the alkaline secondary battery is determined when the accumulated amount of deterioration becomes larger than a predetermined determination value.

As a preferable configuration, the deterioration determination unit further includes a notification unit that notifies the outside of a result of determining the deterioration of the alkaline secondary battery.
According to such a configuration, since the determination result of the deterioration of the alkaline secondary battery is notified to the outside, the use of the alkaline secondary battery in consideration of the deterioration is made.

  According to the secondary battery deterioration determination device, the secondary battery deterioration determination method, and the secondary battery control device, it is possible to determine the deterioration of the alkaline secondary battery even when indefinite charge / discharge is repeated. .

The block diagram which shows the schematic structure about one Embodiment which actualized the deterioration determination apparatus of the secondary battery. The graph which shows the relationship between the variation | change_quantity (dSOC) which the charge condition (SOC) changed for every charge and every discharge in the embodiment, and the fall amount of insulation resistance. The graph which shows an example of the change in the charge condition (SOC) of the secondary battery in use in the embodiment, and an example of the change amount (dSOC) changed at each charge and every discharge at that time. The flowchart which shows the procedure which calculates the deterioration amount in the embodiment.

  An embodiment embodying a secondary battery deterioration determination device will be described with reference to FIGS. The battery 10 is a nickel metal hydride secondary battery as an alkaline secondary battery. Here, the battery 10 is configured as, for example, an assembled battery to which a plurality of battery modules are connected. The battery module is composed of six single cells. The unit cell is composed of an electrode plate group in which a plurality of positive and negative electrode plates are laminated via a separator, and an alkaline electrolyte.

  As shown in FIG. 1, the battery 10 is mounted on an electric vehicle or a hybrid vehicle and supplies power to the electric motor 12 and the like. The battery 10 is connected to the driving device 11 as a power source. The drive device 11 causes the battery 10 to discharge an amount of electric power necessary for traveling, and drives the electric motor 12 using the discharged electric power to rotate the drive wheels 13 of the vehicle. Further, the drive device 11 regenerates electric power output from the electric motor 12 that is driven by the rotation of the drive wheel 13 and charges the battery 10. Therefore, the battery 10 tends to be repeatedly charged and discharged with an indefinite amount of power according to the running state of the vehicle at irregular and irregular intervals and including a short period of change.

  Further, the battery 10 includes a voltage measuring device 21 that measures the voltage across the terminals of the battery 10, a current measuring device 22 that measures the charge / discharge current of the battery 10, and a deterioration determination of the secondary battery that determines the deterioration of the battery 10. A determination device 30 as a device is connected.

The voltage measuring device 21 outputs a voltage signal corresponding to the measured inter-terminal voltage of the battery 10 to the determination device 30.
The current measuring device 22 outputs a current signal corresponding to the measured discharge current and charge current of the battery 10 to the determination device 30.

  The determination device 30 can determine whether the battery 10 has deteriorated, and can display the result of the determination or output the result to the outside. The determination device 30 acquires the voltage between the terminals of the battery 10 from the voltage signal input from the voltage measuring device 21, and acquires the charge / discharge current of the battery 10 from the current signal input from the current measuring device 22.

  In addition, the determination device 30 includes a processing unit 40 that performs a deterioration determination process that is a process of determining the deterioration of the battery 10, and a storage unit 50 that holds data used for calculation of the deterioration determination process of the battery 10. The processing unit 40 includes a computer and includes an arithmetic device, a volatile memory, a nonvolatile memory, and the like. The processing unit 40 can exchange data with the storage unit 50. The storage unit 50 is a non-volatile storage device such as a hard disk or a flash memory, and holds various data.

  The storage unit 50 stores an SOC value 51 including various state of charge (SOC) of the battery 10 and SOC calculation data 52 required for calculating the SOC. The SOC value 51 includes values such as the initial SOC of the battery 10 and the current SOC. The SOC calculation data 52 stores parameters such as the amount of electricity that can be charged to the battery 10.

  The storage unit 50 also stores a dSOC value 53 including the SOC change amount (dSOC) for each charging and discharging of the battery 10 and dSOC calculation data 54 required for calculating dSOC. Here, dSOC is the amount of SOC changed by one charge or discharge, the amount of SOC increased by one charge sandwiched between two discharges, or sandwiched between two charges. It is the amount of SOC reduced by a single discharge. In other words, dSOC refers to the amount of change in SOC with respect to an increase or decrease in the SOC of battery 10. The dSOC value 53 stores the latest dSOC and, if necessary, an earlier dSOC. The dSOC calculation data 54 stores information such as the current insulation resistance value of the battery 10, the initial insulation resistance value of the battery 10, and information indicating the relationship between dSOC and the amount of decrease in insulation resistance. Here, the insulation resistance is an insulation resistance between the positive electrode and the negative electrode of the battery 10, for example, an insulation resistance of the separator, but may be an insulation resistance detected in a form including other factors.

Incidentally, the inventors have found that the amount of decrease in insulation resistance of the battery 10 is correlated with dSOC.
That is, as shown in FIG. 2, it was found that the information indicating the relationship between dSOC and the amount of decrease in insulation resistance is data that can indicate the amount of decrease in insulation resistance corresponding to dSOC as a downward-sloping graph L1. . Note that the information may be information including mapping data or a function expression as long as the information indicates the graph L1. Here, the graph L1 shows a relationship in which the amount of decrease in insulation resistance increases, that is, becomes negative in accordance with the magnitude of dSOC. The amount of decrease in insulation resistance is considered to indicate, for example, the degree of progress of chemical shortness that occurs in the separator as aged deterioration as a decrease in insulation resistance. For example, in the separator, the insulation resistance is lowered due to the precipitation of the dissolved metal from the active material or the movement of the electrode active material. And when the fall of such insulation resistance advances, it is thought that the possibility that the battery 10 will produce a micro short circuit increases. Therefore, it has been found that the amount of deterioration of the battery 10 can be calculated based on the amount of decrease in insulation resistance, and the deterioration can be determined from the calculated amount of deterioration. Conversely, it has also been found from the relationship shown in FIG. 2 that by limiting the charging / discharging conditions of the battery 10 to a preferable range, a minute short circuit can be suppressed and deterioration of the battery 10 can be suppressed.

  The graph L1 in FIG. 2 shows, for example, that the amount of decrease in insulation resistance when dSOC is “1%” is doubled compared to the amount of decrease in insulation resistance when dSOC is “0.1%”. , DSOC is “10%”, indicating that the amount of decrease in insulation resistance is tripled. By applying dSOC calculated each time charging / discharging to the graph L1, it is possible to calculate the amount of insulation resistance decrease due to each calculated dSOC, that is, the so-called deterioration amount for each charging / discharging. And the deterioration amount of the battery 10 is obtained by accumulating the deterioration amount for every charging / discharging. In addition, if the insulation resistance related to the separator is reduced, the increase in the thickness of the separator or the increase in the fiber density can suppress the decrease in the insulation resistance. An increase may cause a decrease in ionic conductivity or an increase in cost.

Therefore, the determination device 30 that performs the deterioration determination process will be described.
As shown in FIG. 1, the processing unit 40 includes a voltage measurement unit 41 that acquires a voltage between terminals of the battery 10 from a voltage signal input from the voltage measurement device 21, and a battery from the current signal input from the current measurement device 22. And a current measuring unit 42 for acquiring 10 charging / discharging currents.

  Further, the processing unit 40 serves as an SOC calculation unit 43 that calculates the SOC of the battery 10, and a change amount calculation unit that calculates dSOC, which is the change amount of the SOC when the SOC increases or decreases. a dSOC calculation unit 44. The SOC calculation unit 43 can calculate the SOC of the battery 10 by, for example, calculating from the voltage between terminals, calculating from the accumulated charge / discharge amount, calculating from the complex impedance, or other known methods. .

  Further, the processing unit 40 determines the deterioration amount of the battery 10 based on each dSOC, determines the deterioration of the battery 10 based on the accumulated amount of deterioration, and outputs the determination result. And a deterioration determination output unit 46 as a deterioration determination unit.

With reference to FIG.3 and FIG.4, operation | movement of the deterioration determination apparatus of this embodiment is demonstrated.
FIG. 3 shows an example of a change in SOC that occurs in the battery 10 in accordance with the traveling of the vehicle. Here, “1 cyc” is an arbitrarily divided time interval, for example, a time interval from “ON” to “OFF” of the ignition. “ΔSOC” is the maximum width of the SOC changed during “1 cyc”, and is the difference between when the charge amount becomes maximum and when the charge amount becomes minimum. When the battery 10 is controlled to be used between SOC “80%” or less and “20%” or more, ΔSOC often has a value of “60%” or less. Since the battery 10 is repeatedly charged and discharged indefinitely according to the traveling state in “1cyc”, the SOC repeatedly increases and decreases, and the change in the SOC is shown as graphs L21 and L22, for example. The graph L21 includes sections cd11, cd13,..., Cd1n where the battery 10 is charged, and sections cd12, cd14,..., Cd1m (where m = n−1) where the battery 10 is discharged. doing. The amount of change in SOC for each of the sections cd11 to cd1n is dSOC for each charge or discharge. For example, the dSOC of the section cd11 is “ds11”, the dSOC of the section cd12 is “ds12”, and the dSOC of the section cd13 is “ds13”. Similarly, the dSOC of the section cd1m is “ds1m”, and the dSOC of the section cd1n is “ds1n”. Based on the dSOCs “ds11” to “ds1n” calculated in this way, the deterioration amount at “1 cyc” is obtained, and the deterioration amount at each “1 cyc” after the battery 10 is used for the first time is obtained. The accumulation is obtained as the amount of deterioration of the battery 10 at the present time. Further, a graph L22 showing the change in SOC at the next “1cyc” is a section cd21, cd23,..., Cd2n in which the battery 10 is charged, and a section cd22, cd24,. And have. In this case, for example, the dSOC of the section cd21 is obtained as “ds21”, and the dSOC of the section cd22 is obtained as “ds22”.

FIG. 4 shows the procedure of the battery 10 deterioration determination process. The deterioration determination process is started when the ignition of the vehicle is turned on by the processing unit 40 of the determination device 30.
When the determination process is started, the processing unit 40 measures the current (step S10). The current may be the amount of current in a specified measurement period. For example, in the current, the difference in direction between charging and discharging is indicated by the difference in polarity of “+/−”. The processing unit 40 determines whether charging and discharging are switched (Step S11). Switching between charging and discharging is determined based on the difference between the current direction measured last time and the current direction measured this time. If the direction of the current based on the amount of current is used for the determination of charge / discharge, the influence of temporary fluctuations that occur in the current can be suppressed.

  When it is determined that charging and discharging are not switched (NO in step S11), the processing unit 40 determines whether or not an end condition is satisfied (step S18), and when the end condition is not satisfied (step S18). If NO in S18, the process returns to Step S10, while if the end condition is satisfied (YES in Step S18), the deterioration determination process ends. Whether or not the end condition is satisfied is determined based on the fact that the ignition of the vehicle has been turned off, or that the vehicle has been parked or stopped for a long time.

  Conversely, when it is determined that charging and discharging have been switched (YES in step S11), the dSOC calculation unit 44 of the processing unit 40 acquires “current SOC” which is the SOC at the time of switching (step S12). The current SOC may be obtained as SOC calculated sequentially by the SOC calculation unit 43, or may be calculated by the SOC calculation unit 43 at this time. Further, the dSOC calculation unit 44 of the processing unit 40 calculates dSOC (step S13: change amount calculation step). The dSOC is calculated by the dSOC calculation unit 44 as a difference between the “start SOC” and the “current SOC” set in the previous process. “Start SOC” is included in the dSOC value 53 of the storage unit 50 and stored. Next, the dSOC calculation unit 44 of the processing unit 40 performs start SOC setting for setting “current SOC” to “start SOC” (step S14). When it is determined in step S13 that “start SOC” is not set, if step S14 is performed and then the process proceeds to step S18, dSOC can be calculated in the next dSOC calculation process (step S13). It becomes like this.

  Subsequently, the processing unit 40 calculates a deterioration amount by the deterioration amount calculation unit 45 (step S15: deterioration amount calculation step). In the present embodiment, the amount of decrease in insulation resistance is calculated as the amount of deterioration. Therefore, the amount of decrease in insulation resistance is calculated by applying the calculated dSOC for each charge or discharge to information indicating the relationship between dSOC and the amount of decrease in insulation resistance, that is, the graph L1. Note that the absolute value of dSOC is applied to the graph L1 regardless of whether it is charged or discharged, and the amount of decrease in insulation resistance is always calculated as a value with the same sign, and here, as a negative value. Then, the degradation determination output unit 46 of the processing unit 40 updates the accumulated degradation amount with the calculated degradation amount (step S16: degradation amount accumulation step). In the present embodiment, the cumulative deterioration amount has a large negative value (absolute value) regardless of whether it is charged or discharged. Since the battery 10 deteriorates in both charging and discharging, it is appropriate that the cumulative deterioration amount increases.

  When the accumulated deterioration amount is updated, the processing unit 40 determines the deterioration of the battery 10 by the deterioration determination output unit 46 (deterioration determination step) and outputs the determination result (step S17). The deterioration of the battery 10 is determined based on the fact that the cumulative deterioration amount is larger than the prescribed determination value, and here the negative value is large. In other words, the processing unit 40 outputs a determination result of “not deteriorated” if the cumulative deterioration amount is equal to or less than the predetermined determination value, and conversely if the cumulative deterioration amount is larger than the predetermined determination value, Outputs the judgment result of “Deteriorated”. Note that the predetermined determination value is stored in the storage unit 50 or the like as a predetermined value. When the deterioration of the battery 10 is determined, the deterioration determination result is output to other control devices of the vehicle via a notification unit including a communication device of the in-vehicle LAN.

  When the determination result is output, determination device 30 determines whether or not the end condition is satisfied (step S18). If the end condition is not satisfied (NO in step S18), the process returns to step S10. On the other hand, when the termination condition is satisfied (YES in step S18), the deterioration determination process is terminated.

And the determination result output from the determination apparatus 30 is utilized with a vehicle.
In the vehicle, based on the determination result “deteriorated” of the battery 10 output from the determination device 30, a notification that prompts the driver to suppress charging / discharging of the battery 10 as information for extending the life of the battery 10. You may do.

  Further, in the vehicle, charging / discharging of the battery 10 may be controlled so as to extend the life of the battery 10 based on the determination result of the deterioration of the battery 10 output from the determination device 30. For example, a secondary battery control device (not shown) may be provided in the vehicle, and charge / discharge in the driving device 11 may be managed by a charge / discharge control unit (not shown) of the control device. The charge / discharge control unit may control the electric motor 12 based on the determination result “deteriorated” so that the discharge amount and the charge amount of the battery 10 are reduced. For example, the output can be reduced to reduce the discharge amount, or the regeneration amount can be suppressed to reduce the charge amount. In the case of a hybrid vehicle, the amount of discharge to the electric motor 12 can be reduced by increasing the load on the engine side, and the amount of power generated by the engine can be reduced to reduce the amount of charge. Moreover, you may make it restrict | limit the charge amount and discharge amount in one charge or discharge. Such a restriction may be defined by the amount of current or simply by time. If the time is set short, the amount of current decreases.

As described above, according to the secondary battery deterioration determination device of the present embodiment, the following effects can be obtained.
(1) About the battery 10 in use, while calculating the deterioration amount for every charge or every discharge based on the variation | change_quantity of SOC, this is accumulated. Therefore, even if charging / discharging is repeated indefinitely, the deterioration of the battery 10 is determined based on the calculated deterioration amount. Thereby, overcharge and overdischarge of the battery 10 can be avoided, and management can be suitably performed.

  In addition, since the deterioration can be determined while the battery 10 is in use, it is possible to select a usage method in which the deterioration of the battery 10 is small. Therefore, it is possible to present information for extending the life of the battery 10 and to control charging and discharging, and the convenience of using the battery 10 is improved.

  (2) By setting the deterioration amount as a decrease in the insulation resistance of the separator, it is possible to determine the deterioration of the battery 10 based on the decrease in the insulation resistance of the separator caused by the deposition of a metal dissolved from the active material.

(3) The deterioration of the battery 10 is determined when the accumulated deterioration amount becomes larger than a predetermined determination value.
(4) Since the determination result of the deterioration of the battery 10 is notified to the outside of the determination device 30, the battery 10 is used in consideration of the deterioration.

(Other embodiments)
In addition, the said embodiment can also be implemented with the following forms.
In the above embodiment, the case where the deterioration determination output unit 46 of the processing unit 40 outputs the determination result of deterioration is illustrated. However, the present invention is not limited to this, and if the deterioration determination result can be output, the deterioration determination output unit may output the deterioration determination result to the outside via an output unit such as a display device or an audio output device.

  In the above-described embodiment, the case where the dSOC is the amount of change in the SOC due to the increase or decrease in the increase or decrease that occurs in the SOC has been illustrated. However, the present invention is not limited to this, and when an increase or decrease is interrupted halfway, an increase or decrease before and after the interruption may be treated as one increase or decrease. For example, if the battery self-discharges while charging / discharging is interrupted, but the change in SOC due to the amount of self-discharging during the interruption is less than or equal to the threshold “1%”, the increase or decrease before and after the interruption is increased or decreased by one. Treat as. The threshold value may be changed to any appropriate value based on time, research, or theory.

-In above-mentioned embodiment, although illustrated about the case where the battery 10 is a nickel-hydrogen secondary battery, not only this but other alkaline secondary batteries, such as a nickel cadmium battery, may be sufficient.
In the above embodiment, the case where the battery 10 is mounted on an electric vehicle or a hybrid vehicle has been illustrated, but the present invention is not limited thereto, and the secondary battery may be mounted on a vehicle such as a gasoline vehicle or a diesel vehicle. The secondary battery may be used as a power source for a moving body or a fixed installation. For example, the application destination of the power source includes a moving body such as a railroad, a ship, an aircraft, a robot, or the like, an electrical product such as an information processing apparatus, or the like.

  DESCRIPTION OF SYMBOLS 10 ... Battery, 11 ... Drive apparatus, 12 ... Electric motor, 13 ... Drive wheel, 21 ... Voltage measuring device, 22 ... Current measuring device, 30 ... Judgment device, 40 ... Processing part, 41 ... Voltage measuring part, 42 ... Current Measurement unit, 43 ... SOC calculation unit, 44 ... dSOC calculation unit, 45 ... degradation amount calculation unit, 46 ... degradation determination output unit, 50 ... storage unit, 51 ... SOC value, 52 ... SOC calculation data, 53 ... dSOC value 54 dSOC calculation data.

Claims (5)

A secondary battery deterioration determination device that determines deterioration of an alkaline secondary battery that is repeatedly charged and discharged indefinitely,
For the increase or decrease that occurred in the state of charge of the alkaline secondary battery, a change amount calculation unit that calculates the amount of change in the state of charge at every increase or decrease, and
A deterioration amount calculating unit that calculates the deterioration amount of the alkaline secondary battery based on the change amount and information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount;
A deterioration amount accumulating unit for accumulating the calculated deterioration amount;
A deterioration determining unit that determines deterioration of the alkaline secondary battery based on the accumulated deterioration amount;
As information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount, information indicating that the deterioration amount of the alkaline secondary battery is larger as the change amount of the charge state is larger is set. Secondary battery deterioration determination device. The secondary battery deterioration determination device according to claim 1, wherein the deterioration determination unit determines that the alkaline secondary battery is deteriorated when the accumulated amount of deterioration is larger than a predetermined determination value. The secondary battery deterioration determination apparatus according to claim 1, wherein the deterioration determination unit further includes a notification unit that notifies a result of determining the deterioration of the alkaline secondary battery to the outside. It is a method used in a secondary battery deterioration determination device that determines deterioration of an alkaline secondary battery that is repeatedly charged and discharged indefinitely,
A change amount calculating step for calculating a change amount of the charge state at every increase or decrease for the increase or decrease caused in the charge state of the alkaline secondary battery,
A deterioration amount calculating step of calculating a deterioration amount of the alkaline secondary battery based on the change amount and information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount;
A deterioration amount accumulation step of accumulating the calculated deterioration amount;
A deterioration determination step of determining deterioration of the alkaline secondary battery based on the accumulated deterioration amount,
As information indicating the deterioration amount of the alkaline secondary battery corresponding to the change amount, information indicating that the deterioration amount of the alkaline secondary battery is larger as the change amount of the charge state is larger is set. Secondary battery deterioration judgment method. A control device for a secondary battery that is mounted on a vehicle including a motor in a drive device and controls charging and discharging of an alkaline secondary battery used as a power source of the motor,
A deterioration determination device for determining deterioration of the alkaline secondary battery;
Charging / discharging for controlling charging and discharging of the alkaline secondary battery so that a change amount of the charging state when the charging state of the alkaline secondary battery increases or decreases according to the determination result of the deterioration determination device is reduced. A control unit,
The secondary battery control device, wherein the deterioration determination device is a secondary battery deterioration determination device according to any one of claims 1 to 3.