Battery degradation state estimation device and battery degradation state estimation method

Abstract

The present invention provides a battery degradation state estimation device that estimates the degradation state of a secondary battery, which was installed in a vehicle, at the time of provision for secondary use. In particular, this battery degradation state estimation device comprises: a profile calculation unit that calculates a storage-time degradation profile representing the degradation shift during a storage period from when primary use of the secondary battery ends to when the secondary battery is provided for secondary use; a data generation unit that generates predicted battery state data, including a predicted degradation state at the time of provision for secondary use, on the basis of the storage-time degradation profile; and a data output unit that outputs the predicted battery state data to a predetermined external device.

Description

Battery degradation state estimation device and battery degradation state estimation method

[0001] The present invention relates to a battery degradation state estimation device and a battery degradation state estimation method.

[0002] In recent years, systems have been developed that allow vehicle users of electric vehicles (EVs), hybrid electric vehicles (HEVs), and other vehicles to sell their installed secondary batteries and provide them to predetermined reuse destinations (secondary users) when they give up their vehicles. In these systems, the secondary user (for use as a stationary power source or a mobile power source, for example) is determined based on the state of the secondary battery at the time when its use as an on-board battery (primary use) ends.

[0003] As described above, by providing on-board secondary batteries that have completed their primary use to designated secondary users, it is possible to reduce the amount of secondary batteries that are discarded while meeting the needs for storage power sources for each secondary use. For this reason, it is desirable to widely disseminate the above-mentioned systems that supply on-board secondary batteries to secondary users.

[0004] One way to popularize this system is to encourage primary users (vehicle owners) to sell their secondary batteries to secondary users. From this perspective, there is known a technology for estimating the degradation state of the secondary battery, which directly affects the battery value when it is offered to secondary users.

[0005] Specifically, WO2021 / 193006A1 discloses a battery reuse support system that estimates the deterioration state of a battery at the planned time of sale obtained from the user based on the deterioration state of the battery while the vehicle is in use (during primary use), determines multiple product types (each secondary use destination) that can be installed from the estimated deterioration state, calculates the trading price (predicted selling price) of the battery for each determined product type, and notifies the user.

[0006] In WO2021 / 193006A1, the degradation state of a battery from the time of primary use to the time of planned sale is calculated based on a predetermined uniform degradation line. However, a certain storage period (e.g., several months to several years) may be required between the end of the secondary battery's primary use (when it is removed from the vehicle) and the start of secondary use (when it is provided to the secondary user). During the storage period, the secondary battery is generally not charged or discharged, but degradation of the secondary battery progresses due to storage degradation. However, in the technology of WO2021 / 193006A1, the progression of degradation during the storage period is also uniformly estimated using the same degradation line as during primary use. As a result, the estimated value of the secondary battery's degradation state at the start of secondary use may deviate from the actual value, and its reliability may not be ensured.

[0007] Therefore, an object of the present invention is to further improve the accuracy of estimating the degradation state of a secondary battery when it is provided to a secondary user.

[0008] According to one aspect of the present invention, there is provided a battery degradation state estimation device that estimates the degradation state of a secondary battery installed in a vehicle at the time of providing it for secondary use. In particular, the battery degradation state estimation device includes a profile calculation unit that calculates a storage degradation profile that represents the progression of degradation during a storage period from the end of primary use of the secondary battery to being provided for secondary use, a data generation unit that generates predicted battery state data including a predicted degradation state at the time of providing it for secondary use based on the storage degradation profile, and a data output unit that outputs the predicted battery state data to a predetermined external device.

[0009] FIG. 1 is a block diagram showing the main configuration of a battery degradation state estimation system common to all embodiments. FIG. 2 is a block diagram showing details of a battery degradation state estimation system according to a first embodiment. FIG. 3 is a flowchart explaining each process performed by a battery degradation state estimation device. FIG. 4 is a flowchart explaining a deterioration profile calculation. FIG. 5 is a block diagram showing a specific configuration for realizing the deterioration profile calculation. FIG. 6 is a diagram showing an example of a storage SOC transition. FIG. 7 is a diagram showing an example of a storage deterioration profile corresponding to each secondary battery. FIG. 8 is a block diagram showing details of a battery degradation state estimation system according to a second embodiment. FIG. 9 is a flowchart explaining the deterioration profile calculation. FIG. 10 is a diagram showing an example of an outside air temperature transition. FIG. 11 is a block diagram showing a specific configuration for realizing the deterioration profile calculation.

[0010] Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

[0011] [First Embodiment] Fig. 1 is a diagram illustrating the configuration of a battery degradation state estimation system 10 according to this embodiment. Fig. 2 is a block diagram illustrating details of the battery degradation state estimation system 10. The battery degradation state estimation system 10 of this embodiment is configured as a system for predicting the degradation state of secondary batteries B (B1, B2, ... Bn) installed in each vehicle V (V1, V2, ... Vn in Fig. 1 ) when the secondary batteries B are provided to a predetermined secondary use destination (reuse destination), and for providing information (data) related to the degradation state to an external party. Note that each vehicle V in this embodiment is assumed to be an electric vehicle or a hybrid vehicle equipped with an on-board battery.

[0012] In particular, the battery degradation state estimation system 10 mainly comprises a battery degradation state estimation device 20, an on-board battery management server 30, on-board terminals VT (VT1, VT2, ... VTn) installed in each vehicle V, and an external terminal 40.

[0013] The battery degradation state estimation device 20 is connected to an in-vehicle battery management server 30, each in-vehicle terminal VT, and an external terminal 40 via a predetermined network 100 so as to be able to communicate with each other. The network 100 is configured with various hardware and communication protocols for enabling communication between the battery degradation state estimation device 20, the in-vehicle battery management server 30, each in-vehicle terminal VT, and the external terminal 40. In particular, the communication function between the in-vehicle battery management server 30 or the external terminal 40 and the battery degradation state estimation device 20 is realized by various communication protocols such as TCP / IP for wide area network communication. Furthermore, the communication function between the in-vehicle terminal VT and the battery degradation state estimation device 20 is realized by various communication protocols for realizing so-called telematics (mobile communication system).

[0014] The following describes in detail each component of the battery degradation state estimation system 10. Note that, in the following, to clarify that the description is representative of any one of the vehicles V (V1, V2, ... Vn), the symbol "k" (k = any integer from 1 to n) is used as appropriate. The same applies to each in-vehicle terminal VT (VT1, VT2, ... VTn) and secondary battery B (B1, B2, ... Bn).

[0015] <Battery Degradation State Estimation Device 20> The battery degradation state estimation device 20 is configured as a computer equipped with various calculation / control devices, storage devices, and input / output devices, and with programs for executing desired calculation and control processes stored in the storage devices. When the battery degradation state estimation device 20 receives a request signal including identification information (hereinafter simply referred to as "battery ID") of the target secondary battery Bk from the external terminal 40, it acquires various input information identified by the battery ID from the in-vehicle battery management server 30. Then, based on the various input information, the battery degradation state estimation device 20 generates predicted battery state data for the secondary battery Bk linked to the battery ID. Furthermore, the battery degradation state estimation device 20 outputs and transmits the generated predicted battery state data to the external terminal 40.

[0016] More specifically, the battery degradation state estimating device 20 includes a battery information acquiring unit 21 , a profile calculating unit 23 , a data generating unit 24 , a data output unit 25 , a battery management DB 26 , and a storage information DB 27 .

[0017] When the battery information acquisition unit 21 receives a request signal including a battery ID linked to the secondary battery Bk from the external terminal 40, the battery information acquisition unit 21 refers to the battery management DB 26 to acquire the vehicle Vk (vehicle ID) linked to the battery ID and the secondary use start date t of the secondary battery Bk. ２ｅ Here, the secondary use start date t ２ｅ The "date" is a date on which the secondary battery Bk is scheduled to be provided to a secondary user, and is set in advance.

[0018] Furthermore, the battery information acquisition unit 21 receives information about the secondary battery Bk mounted on the vehicle Vk from the in-vehicle battery management server 30 using the identified vehicle ID as a key. In particular, in this embodiment, the information received from the in-vehicle battery management server 30 includes the primary use start date t １ｓ , primary use end date t １ｅ , and the final SOC (State of Charge).

[0019] Primary usage start date t １ｓ is the date on which the secondary battery Bk actually begins to be used as an in-vehicle battery, such as the product shipping date of the vehicle Vk or the date on which the user purchases the vehicle Vk. １ｅ is the date on which the use of the battery as an in-vehicle battery ends. １ｅ is defined as the date on which the user completes the procedures for the purchase and sale contract of the vehicle Vk or the secondary battery Bk and removes the secondary battery Bk from the vehicle Vk. １ｅ is the state of charge (SOC) of the secondary battery Bk at

[0020] The battery information acquisition unit 21 stores the primary use start date t １ｓ , primary use end date t １ｅ , final SOC, and the planned start date of secondary use t ２ｅ The data obtained by linking these is output to the profile calculation unit 23.

[0021] The profile calculation unit 23 calculates the primary use start date t １ｓ , primary use end date t １ｅ , final SOC, and the planned start date of secondary use t ２ｅ is used as an input, and the storage deterioration profile P of the secondary battery Bk associated with the battery ID is calculated. Ｂｋ (t) is calculated. Here, the storage deterioration profile P Ｂｋ (t) is the primary usage end date t １ｅ Scheduled start date of secondary use t ２ｅ Storage period [t １ｅ , t ２ｅ ]. In particular, in this embodiment, the SOH (State Of Health) of the secondary battery Bk is used as a specific parameter indicating the state of deterioration of the secondary battery Bk. The SOH is calculated from the initial value (for example, the first use start date t １ｓ It is defined as the ratio (capacity retention rate) of the current battery capacity (fully charged capacity) to the battery capacity (fully charged capacity) of the previous battery.

[0022] In particular, the profile calculation unit 23 reads out storage environment information for the secondary battery Bk from the storage information DB 27 using the battery ID as a key. The storage environment information includes information about the storage location (facility) of the secondary battery Bk. In particular, the storage environment information preferably includes physical quantities (such as temperature or humidity during storage) that affect the self-discharge rate (rate of decrease in SOC) of the secondary battery Bk. More preferably, the storage environment information preferably includes the ambient temperature (storage temperature Ts) of the secondary battery Bk during storage, or information necessary to estimate the storage temperature Ts. As an example, the storage environment information preferably includes the storage management temperature of the secondary battery Bk for each storage facility. Details of the processing in the profile calculation unit 23 will be described later.

[0023] The data generating unit 24 generates the storage deterioration profile P calculated by the profile calculating unit 23. Ｂｋ In particular, the data generating unit 24 generates predicted battery state data based on the storage deterioration profile P Ｂｋ The entirety of (t), or at least the planned start date of secondary use t ２ｅDeterioration profile P during storage Ｂｋ Generate predicted battery state data including the value of (t) (predicted SOH).

[0024] Data output unit 25 outputs the predicted battery state data to external terminal 40. Note that, instead of the function of simply transmitting the predicted battery state data to external terminal 40, data output unit 25 may have a so-called SaaS (Software as a Service) function of displaying information included in the predicted battery state data on the display screen of external terminal 40 in a desired display format.

[0025] The battery management DB 26 is a database that stores a battery ID uniquely assigned to each secondary battery B, linked to a vehicle ID assigned to each vehicle V. The storage information DB 27 is a database that stores the battery ID of each secondary battery B, linked to its respective storage environment information.

[0026] <In-Vehicle Battery Management Server> The in-vehicle battery management server 30 is a server that manages each secondary battery B mounted on each vehicle V included in the battery degradation state estimation system 10. In particular, the in-vehicle battery management server 30 of this embodiment stores the vehicle ID of each vehicle V and the primary use start date t １ｓ , primary use end date t １ｅ When the in-vehicle battery management server 30 receives a signal including the vehicle ID from the battery information acquisition unit 21, it acquires the primary use start date t of the secondary battery Bk associated with the vehicle ID. １ｓ , primary use end date t １ｅ , and the final SOC are read from the database and transmitted to the battery degradation state estimating device 20 .

[0027] <External Terminal> The external terminal 40 is a terminal operated by an intermediary (such as a storage location manager) involved in providing the secondary battery Bk to a secondary user, or a secondary user (such as a recycler), and is configured as a mobile terminal such as a smartphone or a tablet terminal, or a personal computer such as a notebook computer (laptop) or desktop.

[0028] In particular, when the external terminal 40 detects an input operation by a predetermined operator requesting the provision of predicted battery state data, it generates a request signal including a battery ID and transmits it to the battery degradation state estimating device 20. The external terminal 40 also has a display unit (display screen) for displaying various information included in the predicted battery state data received from the battery degradation state estimating device 20 in response to the transmission of the request signal in a predetermined manner according to a program stored in its own memory area or by processing by the battery degradation state estimating device 20.

[0029] <On-Vehicle Terminal> The on-vehicle terminal VTk is an on-vehicle computer that is mounted on the vehicle Vk and provides the battery degradation state estimating device 20 with necessary information.

[0030] The specific processing executed by the battery degradation state estimating device 20 will be described in more detail below.

[0031] FIG. 3 is a flowchart illustrating the details of the processing performed by the battery degradation state estimating device 20.

[0032] In step S100, the battery information acquisition unit 21 uses the battery ID received from the external terminal 40 as a key to acquire the secondary use start date t ２ｅ Get.

[0033] Next, in step S200, the battery information acquisition unit 21 acquires the primary use start date t of the secondary battery Bk linked to the battery ID from the in-vehicle battery management server 30. １ｓ , primary use end date t １ｅ , and the final SOC.

[0034] In step S300, the profile calculation unit 23 calculates the storage deterioration profile P Ｂｋ (t) is calculated.

[0035] FIG. 4 is a flowchart for explaining the deterioration profile calculation, and FIG. 5 is a block diagram showing a specific configuration for realizing the deterioration profile calculation.

[0036] First, the profile calculation unit 23 extracts the storage environment information of the corresponding secondary battery Bk from the storage information DB 27 using the battery ID as a key (S310).

[0037] Next, the profile calculation unit 23 calculates the storage environment information, the final SOC, and the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ In particular, the SOC transition during storage in this embodiment is calculated based on the storage period [t １ｅ , t ２ｅ ] is given as a function representing the change over time in the SOC of the secondary battery Bk.

[0038] 6 is a diagram showing an example of the SOC transition during storage. As shown in the figure, the SOC transition during the storage period [t １ｅ , t ２ｅ ] may change in different storage environments (storage environments I and II in FIG. 5). Therefore, by calculating the SOC transition during storage with reference to the storage environment information, it is possible to reflect in the calculation the difference in the SOC characteristic over time depending on the storage environment (temperature, humidity, etc.).

[0039] In addition, the storage period [t １ｅ , t ２ｅ During the storage period [t １ｅ , t ２ｅ ] indicates the amount of self-discharge of the secondary battery Bk.

[0040] 4 and 5, the profile calculation unit 23 calculates the storage environment information, the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ In particular, the storage temperature transition Ts(t) in this embodiment is calculated based on the storage period [t １ｅ , t ２ｅ ]. In the case where the storage temperature Ts does not change over time, such as when the temperature is kept constant depending on the storage facilities, the storage temperature transition Ts(t) can be set to a constant.

[0041] The profile calculation unit 23 then calculates a storage deterioration profile P from the storage SOC transition and the storage temperature transition Ts(t). Ｂｋ (t) is calculated (S340).

[0042] Specifically, first, the profile calculation unit 23 calculates a first unit deterioration amount ΔD1(t) by multiplying the SOC transition during storage by a predetermined gain K1 (S3401). Here, the first unit deterioration amount ΔD1(t) is calculated as １ｅ , t ２ｅ ] is a function that represents the deterioration amount (decrease in SOH) per unit time (unit number of days) according to the change in SOC of the secondary battery Bk during the period. １ｅ The gain K1 is proportional to the square root of the number of days t elapsed from the base point t, and increases as the SOC of the secondary battery Bk increases. Therefore, the gain K1 is set to an appropriate value for determining the first unit degradation amount ΔD1(t) taking into consideration the number of days t elapsed and the change (decrease) in SOC depending on the number of days t elapsed.

[0043] The profile calculation unit 23 also calculates a second unit deterioration amount ΔD2(t) by multiplying the storage temperature transition Ts(t) by a predetermined gain K2 (S3402). Here, the second unit deterioration amount ΔD2(t) is calculated as a function of the storage period [t １ｅ , t ２ｅ The deterioration amount of the secondary battery Bk due to storage deterioration (decrease in SOH) per unit time (unit number of days) according to the change in the storage temperature Ts of the secondary battery Bk during the primary use end date t １ｅ The gain K2 is proportional to the square root of the number of days t elapsed from the base point t, and increases as the storage temperature Ts increases. Therefore, the gain K2 is set to an appropriate value for determining the second unit degradation amount ΔD2(t) in consideration of the number of days t elapsed and the change in the storage temperature Ts according to the number of days elapsed t.

[0044] Then, the profile calculation unit 23 calculates the primary usage end date t １ｅThe sum (integral value) of the products of the first unit deterioration amount ΔD1(t) and the second unit deterioration amount ΔD2(t) at any time point of the number of days t elapsed from the starting point is calculated as the storage deterioration degree D(t) (S3403). １ｅ It is determined as a function that represents the amount of reduction in SOH from the time when the temperature reaches t.

[0045] The storage deterioration degree D(t) is calculated from the first use start date t １ｓ and primary use end date t １ｅ The primary use period [t １ｓ , t １ｅ For example, it is preferable to calculate the storage deterioration degree D(t) obtained by the calculation logic of S3401 to S3403 by taking into account the primary usage period [t １ｓ , t １ｅ ] can be adjusted to be larger the longer the primary usage period [t １ｓ , t １ｅ ], the storage deterioration degree D(t) can be determined with higher accuracy by taking into consideration the deterioration over time of the secondary battery Bk according to the length of the storage period.

[0046] Furthermore, the profile calculation unit 23 calculates the primary usage end date t １ｅ The storage deterioration profile P is calculated by subtracting the storage deterioration degree D(t) from the SOH of the secondary battery Bk at the time of storage (hereinafter also referred to as "initial SOH"). Ｂｋ (t) is calculated (S3404). That is, the storage deterioration profile P Ｂｋ (t) is the primary usage end date t １ｅ The storage degradation profile P is defined as a function representing the change in the SOH of the secondary battery Bk over time from the storage degradation profile P to the number of days elapsed t. Ｂｋ (t) at t = t ２ｅ The value applied is the scheduled start date of secondary use t ２ｅ The SOH (predicted deterioration state) of the secondary battery Bk at this time is determined as an estimated value.

[0047] In particular, according to the logic of the deterioration profile calculation, the storage deterioration profile P specific to the secondary battery Bk is ＢｋThat is, when each of the secondary batteries B1, B2, B3, ... is targeted, a unique storage deterioration profile P Ｂ１ (t), P Ｂ２ (t), P Ｂ３ (t)... can be determined.

[0048] FIG. 7 shows the storage deterioration profile P for each of the secondary batteries B1, B2, and B3. Ｂ１ (t), P Ｂ２ (t), P Ｂ３ The deterioration profile calculation is performed using the input parameter (the end date of primary use t １ｅ , secondary use start date t ２ｅ , and storage environment information, etc.) to each secondary battery B1, B2, B3 (each battery ID), a storage deterioration profile P unique to each secondary battery B1, B2, B3 shown in FIG. Ｂ１ (t), P Ｂ２ (t), P Ｂ３ (t) can be obtained.

[0049] Returning to FIG. 3, in step S400, the data generating unit 24 generates a storage deterioration profile P Ｂｋ The data output unit 25 generates predicted battery state data from (t). Furthermore, the data output unit 25 outputs the generated predicted battery state data to the external terminal 40.

[0050] The effects of the configuration of the battery degradation state estimating device 20 of this embodiment described above will be described.

[0051] In this embodiment, a battery degradation state estimation device 20 is provided that estimates the degradation state of a secondary battery Bk that was mounted on a vehicle Vk when it is offered for secondary use. This battery degradation state estimation device 20 estimates the storage period [t １ｅ , t ２ｅ ], which represents the deterioration transition during storage P Ｂｋ (t), and a profile calculation unit 23 that calculates the storage deterioration profile P ＢｋThe battery storage device includes a data generating unit 24 that generates predicted battery state data including a predicted deterioration state (predicted SOH) at the time of secondary use based on (t), and a data output unit 25 that outputs the predicted battery state data to a predetermined external device (external terminal) 40.

[0052] As a result, the storage period [t １ｅ , t ２ｅ ] is taken into account in estimating the degradation state of the secondary battery Bk at the time of secondary use provision, and providing (notifying) the estimated degradation state to the outside. Therefore, the accuracy of estimating the degradation state of the secondary battery Bk at the time of secondary use provision can be further improved, and the reliability of the predicted degradation state provided to the outside can be increased.

[0053] In particular, in this embodiment, the primary use end date t １ｅ and the planned start date of secondary use t ２ｅ The profile calculation unit 23 further includes an acquisition unit (battery state acquisition unit 21) that acquires the primary usage end date t １ｅ , secondary use start date t ２ｅ , and the storage environment information of the secondary battery Bk, the storage deterioration profile P Ｂｋ (t) is calculated.

[0054] This realizes logic for further improving the accuracy of estimating the degradation state of the secondary battery Bk when it is provided for secondary use.

[0055] Furthermore, the battery information acquisition unit 21 acquires the primary use start date t １ｓ The profile calculation unit 23 further acquires the primary use start date t １ｓ and primary use end date t １ｅ The primary use period [t １ｓ , t １ｅ ], and the storage deterioration profile P Ｂｋ (t) is calculated.

[0056] As a result, the deterioration state of the secondary battery Bk at the time of secondary use provision is calculated based on the primary use period [t １ｓ , t １ｅ] is used to realize a logic for more accurate estimation by taking into account aging deterioration according to the length of the

[0057] In particular, in the battery degradation state estimation device 20 of this embodiment, the battery information acquisition unit 21 １ｅ The profile calculation unit 23 further acquires the final charging rate (final SOC) of the secondary battery Bk at the storage environment information, the final SOC, and the end date t １ｅ , and the planned start date of secondary use t ２ｅ Based on this, the storage period [t １ｅ , t ２ｅ ]. The profile calculation unit 23 calculates a storage state of charge transition (storage state of charge transition) that represents a change over time in the state of charge (SOC) at the storage environment information, the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ Based on this, the storage period [t １ｅ , t ２ｅ ]. Furthermore, the profile calculation unit 23 calculates a storage deterioration profile P based on the storage SOC transition and the storage temperature transition Ts(t). Ｂｋ (t) is calculated.

[0058] As a result, the storage period [t １ｅ , t ２ｅ ] and storage environment to determine the storage deterioration profile P Ｂｋ More specific logic for computing (t) is implemented.

[0059] Second Embodiment A second embodiment will now be described, in which the same elements as those in the first embodiment are denoted by the same reference numerals and their description will be omitted.

[0060] 8 is a block diagram showing details of the battery degradation state estimation system 10 of this embodiment. As shown in the figure, the in-vehicle battery management server 30 of this embodiment １ｓ , primary use end date t １ｅ , secondary use start date t ２ｅ, and the final SOC, information indicating the position of the vehicle Vk (hereinafter also simply referred to as "vehicle position information") is transmitted to the battery degradation state estimation device 20. The in-vehicle battery management server 30 previously acquires vehicle position information (GPS information) for each vehicle V by communicating with each in-vehicle terminal VT, and stores this information in a database (not shown) linked to the vehicle ID. Then, when the in-vehicle battery management server 30 receives a command signal including the vehicle ID from the battery degradation state estimation device 20 (battery information acquisition unit 21), it outputs the vehicle position information linked to the vehicle ID to the battery degradation state estimation device 20.

[0061] In addition, the battery information acquisition unit 21 in the battery degradation state estimation device 20 of this embodiment outputs vehicle position information acquired from the vehicle battery management server 30 to the profile calculation unit 23 together with each input parameter described in the first embodiment.

[0062] FIG. 9 is a flowchart illustrating the deterioration profile calculation (S300) of this embodiment.

[0063] First, the profile calculation unit 23 determines whether or not the storage information DB 27 contains storage environment information linked to the battery ID input from the battery information acquisition unit 21 (S350).

[0064] When the profile calculation unit 23 determines that the storage environment information exists, the profile calculation unit 23 calculates the storage deterioration profile P Ｂｋ (t) is calculated (S310 to S340).

[0065] On the other hand, if the profile calculation unit 23 determines that there is no storage environment information associated with the battery ID of the secondary battery Bk, it performs the processes of S360 to S390 to calculate the storage deterioration profile P Ｂｋ (t) is calculated.

[0066] Specifically, profile calculation unit 23 first estimates the storage location of secondary battery Bk from the vehicle position information (S360). More specifically, profile calculation unit 23 generates an area of ​​a predetermined range that includes the location where vehicle Vk is primarily located from the vehicle position information, and then refers to a predetermined map database or the like to identify facilities within that area that can store secondary battery Bk, thereby estimating the storage location.

[0067] Next, the profile calculation unit 23 calculates the outside air temperature change Te(t) based on the estimated storage location (hereinafter referred to as the estimated storage location α) (S370). Here, the outside air temperature change Te(t) is a function that represents the change over time of the outside air temperature Te in the region (country or city, etc.) to which the estimated storage location α belongs over a predetermined period (e.g., one year).

[0068] FIG. 10 is a diagram illustrating an example of an outdoor temperature transition Te(t). The outdoor temperature transition Te(t) represented by the solid line in FIG. 10 uses the annual average temperature data in the region to which the estimated storage location α belongs. The outdoor temperature transition Te(t) represented by the dashed line uses the annual average temperature data in the region to which the other storage location β belongs. In particular, the annual average temperature data shown in FIG. 10 can be obtained by referring to an external database that holds meteorological data for each region. Note that the outdoor temperature transition Te(t) is calculated based on the primary usage end date t １ｅ and the planned start date of secondary use t ２ｅ By applying １ｅ , t ２ｅ ] (the hatched portion in FIG. 10) can be obtained.

[0069] FIG. 11 is a block diagram showing a specific configuration for realizing the deterioration profile calculations (S380, S390, and S340) in this embodiment.

[0070] The profile calculation unit 23 calculates the storage SOC transition from the outside temperature transition Te(t) (S380). In particular, the profile calculation unit 23 calculates the storage SOC transition from the outside temperature transition Te(t), the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ From the storage period [t １ｅ , t ２ｅThe change in SOC over time according to the characteristics of the secondary battery Bk during storage [t １ｅ , t ２ｅ ], if the fluctuation in SOC due to the passage of time or changes in the outside air temperature Te is relatively small, a configuration may be adopted in which the SOC change during storage is calculated as a constant decreasing function according to the passage of time, thereby simplifying the calculation logic.

[0071] Next, the profile calculation unit 23 calculates the storage temperature transition Ts(t) from the outside air temperature transition Te(t) (S380). In particular, the profile calculation unit 23 calculates the storage temperature transition Ts(t) from the outside air temperature transition Te(t) on the primary use end date t １ｅ and the planned start date of secondary use t ２ｅ By applying １ｅ , t ２ｅ ] is generated, and the function is determined as the temperature transition during storage Ts(t).

[0072] Then, the profile calculation unit 23 executes the same calculation logic (S3401 to S3404) as in the first embodiment from the obtained storage SOC transition and storage temperature transition Ts(t) to calculate the storage deterioration profile P Ｂｋ (t) is calculated (S340).

[0073] The effects of the configuration of the battery degradation state estimating device 20 of this embodiment described above will be described.

[0074] In the battery degradation state estimation device 20 of this embodiment, the battery information acquisition unit 21 acquires the primary usage end date t １ｅ The profile calculation unit 23 further acquires a final state of charge (final SOC) which is the state of charge of the secondary battery Bk at t. The profile calculation unit 23 estimates the storage location of the secondary battery Bk based on the location information (vehicle location information) of the vehicle Vk in which the secondary battery Bk is mounted, and acquires the outside air temperature change Te(t) of the area including the storage location based on the estimated storage location.

[0075] Furthermore, the profile calculation unit 23 calculates the final SOC, the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ Based on this, the storage period [t １ｅ , t ２ｅ]. The profile calculation unit 23 calculates a storage SOC transition that represents a change in the charging rate over time at the ambient temperature transition Te(t), the primary use end date t １ｅ , and the planned start date of secondary use t ２ｅ Based on this, the storage period [t １ｅ , t ２ｅ ]. The profile calculation unit 23 calculates a storage temperature transition Ts(t) that indicates a change over time in the storage temperature Ts of the secondary battery Bk at the storage temperature transition Ts(t). Then, the profile calculation unit 23 calculates a storage deterioration profile P Ｂｋ (t) is calculated.

[0076] As a result, even if the storage environment information of the secondary battery Bk cannot be acquired because the storage information DB 27 does not record information on the storage location of the secondary battery Bk, the storage deterioration profile P Ｂｋ It is possible to implement specific logic that allows the calculation of (t).

[0077] Although the embodiments of the present invention have been described above, the configurations described in the above embodiments merely show some of the application examples of the present invention and are not intended to limit the technical scope of the present invention.

[0078] In particular, the scope of disclosure at the time of filing of the present application includes a battery degradation state estimation method for estimating the degradation state of a secondary battery Bk that was mounted on a vehicle Vk at the time of being offered for secondary use. In this battery degradation state estimation method, the storage period [t １ｅ , t ２ｅ ], which represents the deterioration transition during storage P Ｂｋ (t) is calculated, and the storage deterioration profile P Ｂｋ Based on (t), predicted battery state data including a predicted deterioration state (predicted SOH) at the time of secondary use provision is generated, and the predicted battery state data is output to a predetermined external device (external terminal) 40.

[0079] Furthermore, the scope of disclosure of this application at the time of filing includes a battery status information providing program that estimates the deterioration state of a secondary battery Bk installed in a vehicle Vk at the time of secondary use, and a computer-readable storage medium on which the battery status information providing program is stored.

[0080] In particular, this battery state information providing program causes the computer to: (i) determine the storage period [t １ｅ , t ２ｅ ], which represents the deterioration transition during storage P Ｂｋ (t) is calculated, and (ii) the storage deterioration profile P Ｂｋ Based on (t), predicted battery state data including a predicted deterioration state (predicted SOH) at the time of secondary use provision is generated, and (iii) the predicted battery state data is output to a specified external device (external terminal) 40.

Claims

1. A battery degradation state estimation device that estimates a degradation state of a secondary battery mounted on a vehicle at the time of secondary utilization, a profile calculation unit that calculates a storage deterioration profile that represents a deterioration progression during a storage period from the end of primary use of the secondary battery until the secondary battery is provided for secondary use; a data generation unit that generates predicted battery state data including a predicted deterioration state at the time of the secondary use provision based on the storage deterioration profile; and a data output unit that outputs the predicted battery state data to a predetermined external device, an acquisition unit that acquires a primary use end date and a secondary use start date of the secondary battery; The profile calculation unit calculating the storage deterioration profile based on the primary use end date, the planned secondary use start date, and storage environment information of the secondary battery; Battery degradation state estimation device.

2. The battery degradation state estimating device according to claim 1, the acquisition unit further acquires a primary use start date of the secondary battery; The profile calculation unit calculating the storage deterioration profile by referring to a primary usage period determined from the primary usage start date and the primary usage end date; Battery degradation state estimation device.

3. The battery degradation state estimating device according to claim 1, the acquisition unit further acquires a final charging rate, which is a charging rate of the secondary battery on the primary usage end date; The profile calculation unit calculating a storage state of charge transition that represents a change in the state of charge over time during the storage period based on the storage environment information, the final state of charge, the primary use end date, and the scheduled secondary use start date; calculating a storage temperature transition indicating a change over time in the storage temperature of the secondary battery during the storage period based on the storage environment information, the primary use end date, and the scheduled secondary use start date; calculating the storage deterioration profile based on the storage state of charge transition and the storage temperature transition; Battery degradation state estimation device.

4. The battery degradation state estimating device according to claim 1, the acquisition unit further acquires a final charging rate, which is a charging rate of the secondary battery on the primary usage end date; The profile calculation unit estimating a storage location of the secondary battery based on location information of the vehicle on which the secondary battery is mounted; Calculating the change in outside temperature in the area including the storage location based on the estimated storage location; calculating a storage charging rate transition that represents a change in the charging rate over time during the storage period based on the final charging rate, the primary use end date, and the scheduled secondary use start date; calculating a storage temperature transition indicating a change over time in the storage temperature of the secondary battery during the storage period based on the outside air temperature transition, the primary use end date, and the scheduled secondary use start date; calculating the storage deterioration profile based on the storage state of charge transition and the storage temperature transition; Battery degradation state estimation device.

5. A battery degradation state estimation method for estimating a degradation state of a secondary battery mounted on a vehicle at the time of providing for secondary use, comprising: calculating a storage degradation profile that represents a degradation progression during a storage period from the end of primary use of the secondary battery until the secondary battery is provided for secondary use; generating predicted battery state data including a predicted deterioration state at the time of the secondary use provision based on the storage deterioration profile; outputting the predicted battery state data to a predetermined external device; Further, a primary use end date and a secondary use start date of the secondary battery are acquired; In the calculation of the storage deterioration profile, calculating the storage deterioration profile based on the primary use end date, the planned secondary use start date, and storage environment information of the secondary battery; A method for estimating the state of battery deterioration.