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

[Technical Field]

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

[0002] In recent years, systems have been developed to allow users of electric vehicles (EVs) or hybrid electric vehicles (HEVs) to sell the rechargeable batteries installed in their vehicles when they relinquish them, and provide them to designated reuse destinations (secondary use destinations). In this system, the secondary use destination (such as for stationary power supply or mobile power supply) is determined based on the state of the rechargeable battery at the time when its primary use as an in-vehicle battery ends.

[0003] As described above, by providing the rechargeable batteries used in vehicles after their primary use to designated secondary users, the need for storage power in each secondary use application can be met while reducing the amount of rechargeable batteries that are discarded. For this reason, it is desirable to widely disseminate the system for supplying the above-mentioned rechargeable batteries used in vehicles to secondary users.

[0004] One way to promote the system is to encourage primary users, such as vehicle users, to provide (sell) secondary batteries to secondary users. From this perspective, a technology is known that estimates the degradation state of the secondary battery, which is directly related to the battery's value when it is provided to a secondary user.

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

[0006] WO2021 / 193006A1 calculates the battery degradation state from primary use to the planned sale date based on a predetermined, uniform degradation curve. However, a certain storage period (e.g., several months to several years) may be required between the end of primary use of a secondary battery (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, charging and discharging of the secondary battery is basically not performed, but degradation of the secondary battery progresses due to storage degradation. However, with the technology of WO2021 / 193006A1, the degradation progress during the storage period is also uniformly estimated using the same degradation curve as during primary use. Therefore, the estimated value of the degradation state of the secondary battery at the start of secondary use may deviate from the actual value, and its reliability may not be ensured.

[0007] Therefore, the present invention aims to further improve the accuracy of estimating the degradation state of secondary batteries when they are provided to secondary users.

[0008] According to one aspect of the present invention, a battery degradation state estimation device is provided for estimating the degradation state of a secondary battery installed in a vehicle when it is provided for secondary use. In particular, the battery degradation state estimation device comprises a profile calculation unit that calculates a storage degradation profile representing the degradation progression during the storage period from the end of primary use of the secondary battery until it is provided for secondary use; a data generation unit that generates predicted battery state data including the predicted degradation state at the time of 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. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a block diagram showing the main configuration of the battery degradation state estimation system common to each embodiment. [Figure 2] Figure 2 is a block diagram showing the details of the battery degradation state estimation system according to the first embodiment. [Figure 3] Figure 3 is a flowchart illustrating each process performed by the battery degradation state estimation device. [Figure 4]Figure 4 is a flowchart illustrating the degradation profile calculation. [Figure 5] Figure 5 is a block diagram showing the specific configuration for realizing degradation profile calculation. [Figure 6] Figure 6 shows an example of the SOC (State of Charge) change during storage. [Figure 7] Figure 7 shows an example of storage degradation profile for each type of secondary battery. [Figure 8] Figure 8 is a block diagram showing the details of the battery degradation state estimation system according to the second embodiment. [Figure 9] Figure 9 is a flowchart illustrating the degradation profile calculation. [Figure 10] Figure 10 shows an example of the change in outside temperature. [Figure 11] Figure 11 is a block diagram showing a specific configuration for realizing degradation profile calculation. [Modes for carrying out the invention]

[0010] The embodiments of the present invention will be described below with reference to the drawings.

[0011] [First Embodiment] Figure 1 is a diagram illustrating the configuration of the battery degradation state estimation system 10 according to this embodiment. Figure 2 is a block diagram showing the 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 Figure 1) when they are provided to a predetermined secondary use destination (reuse destination), and for providing information (data) regarding the degradation state to an external party. In this embodiment, each vehicle V is assumed to be an electric vehicle or 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 the in-vehicle battery management server 30, each in-vehicle terminal VT, and an external terminal 40 via a predetermined network 100, enabling mutual communication. The network 100 consists of various hardware and communication protocols that enable 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 systems).

[0014] The following describes the details of each component of the battery degradation state estimation system 10. To clarify that the following description represents any one of the vehicles V (V1, V2...Vn), the symbol "k" (k = any integer between 1 and n) is used as appropriate. The same applies to each on-board 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 comprised of a computer equipped with various arithmetic / control devices, a memory device, and input / output devices, and has a program for executing desired arithmetic and control processing stored in the memory device. When the battery degradation state estimation device 20 receives a request signal from an external terminal 40 that includes identification information of the target secondary battery Bk (hereinafter also simply referred to as "battery ID"), it obtains various input information identified by the battery ID from the on-board battery management server 30. The battery degradation state estimation device 20 then generates predicted battery state data for the secondary battery Bk linked to the battery ID based on the various input information. 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 estimation device 20 includes a battery information acquisition unit 21, a profile calculation unit 23, a data generation 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 from an external terminal 40 that includes a battery ID associated with a secondary battery Bk, it refers to the battery management DB 26 and retrieves the vehicle Vk (vehicle ID) and the scheduled start date for secondary use of the secondary battery Bk associated with the battery ID. 2e Extract the following. Here, the planned start date for secondary use is t. 2e This refers to the date on which the secondary battery Bk is scheduled to be provided to its secondary use recipient, and is set in advance.

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

[0019] Primary usage start date t 1sis the date when the secondary battery Bk starts to be used as an in-vehicle battery, such as the product shipment date of the vehicle Vk or the date when the user purchases the vehicle Vk. Also, the end date of the first use t 1e is the date when the use as an in-vehicle battery ends. In particular, the end date of the first use t 1e of the present embodiment is defined as the date when the user completes procedures such as a sales contract for the vehicle Vk or the secondary battery Bk and the secondary battery Bk is removed from the vehicle Vk. Also, the final SOC is the charge rate (SOC) of the secondary battery Bk at the end date of the first use t 1e .

[0020] The battery information acquisition unit 21 outputs data associating the battery ID with the start date of the first use t 1s , the end date of the first use t 1e , the final SOC, and the planned start date of the second use t 2e to the profile calculation unit 23.

[0021] The profile calculation unit 23 calculates the storage deterioration profile P 1s of the secondary battery Bk associated with the battery ID using the start date of the first use t 1e , the end date of the first use t 2e , the final SOC, and the planned start date of the second use t Bk as inputs. Here, the storage deterioration profile P Bk (t) is a function representing the transition of the deterioration state (health state) of the secondary battery Bk during the storage period [t 1e , t 2e from the end date of the first use t 1e to the planned start date of the second use t 2e . In particular, in the present embodiment, the SOH (State Of Health) of the secondary battery Bk is used as a specific parameter indicating the deterioration state of the secondary battery Bk. Note that SOH is defined as the ratio (capacity retention rate) of the current battery capacity (fully charged capacity) to the battery capacity (fully charged capacity) at the initial stage (for example, the start date of the first use t 1s ).

[0022] In particular, the profile calculation unit 23 reads the storage environment information of the secondary battery Bk from the storage information DB 27 using the battery ID as the key. The storage environment information includes information about the storage location (facility) of the secondary battery Bk. In particular, it is preferable that the storage environment information 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 includes the ambient temperature of the secondary battery Bk during storage (storage temperature Ts), or information necessary to estimate the storage temperature Ts. As an example, it is preferable that the storage environment information 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 generation unit 24 generates the storage degradation profile P calculated by the profile calculation unit 23. Bk Based on (t), predictive battery state data is generated. In particular, the data generation unit 24 generates storage degradation profile P Bk (t) the entirety, or at least the planned start date of secondary use t 2e Storage degradation profile P Bk Generate predicted battery state data including the value of (t) (predicted SOH).

[0024] The data output unit 25 outputs the predicted battery status data to the external terminal 40. Alternatively, instead of simply transmitting the predicted battery status data to the external terminal 40, the data output unit 25 may be equipped with a so-called SaaS (Software as a Service) function that displays the information contained in the predicted battery status data on the display screen of the external terminal 40 in a desired display format.

[0025] Battery management DB26 is a database that stores the battery ID, which is uniquely assigned to each secondary battery B, and links it to the vehicle ID, which is assigned to each vehicle V. Storage information DB27 is a database that stores the storage environment information, which is linked to the battery ID of each secondary battery B.

[0026] <Vehicle Battery Management Server> The on-board battery management server 30 is a server that manages each secondary battery B installed in each vehicle V included in the battery degradation state estimation system 10. In particular, the on-board battery management server 30 of this embodiment stores the vehicle ID of each vehicle V and the initial usage start date t for each secondary battery B. 1s , primary use end date t 1e It has a database (not shown) that stores and links the final SOC. When the onboard battery management server 30 receives a signal including the vehicle ID from the battery information acquisition unit 21, it stores the primary use start date t of the secondary battery Bk associated with the vehicle ID. 1s , primary use end date t 1e The final SOC is read from the database and transmitted to the battery degradation state estimation device 20.

[0027] <External device> The external terminal 40 is a terminal operated by an intermediary (such as a storage facility manager) or a secondary user (such as a recycling company) involved in providing secondary batteries Bk to secondary users, and consists of a mobile terminal such as a smartphone or tablet, or a personal computer such as a laptop or desktop.

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

[0029] <In-vehicle terminals> The in-vehicle terminal VTk is an in-vehicle computer mounted on the vehicle Vk, which provides the necessary information to the battery degradation state estimation device 20.

[0030] The following section will describe in more detail the specific processes performed by the battery degradation state estimation device 20.

[0031] Figure 3 is a flowchart illustrating the details of the processing performed by the battery degradation state estimation 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 determine the planned start date of secondary use of the secondary battery Bk associated with the battery ID. 2e Obtain it.

[0033] Next, in step S200, the battery information acquisition unit 21 obtains the primary use start date t of the secondary battery Bk associated with the battery ID from the on-board battery management server 30. 1s , primary use end date t 1e , and obtain the final SOC.

[0034] In step S300, the profile calculation unit 23 calculates the storage degradation profile P of the secondary battery Bk. Bk Perform the operation on (t).

[0035] Figure 4 is a flowchart illustrating the degradation profile calculation, and Figure 5 is a block diagram showing the specific configuration for realizing the degradation profile calculation.

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

[0037] Next, the profile calculation unit 23 calculates the storage environment information, the final SOC, and the initial end date of use t. 1e , and the planned start date for secondary use 2e Based on this, the SOC change during storage is calculated (S320). In particular, the SOC change during storage in this embodiment is calculated over the storage period [t 1e ,t 2e This is given as a function representing the change in SOC of secondary battery Bk over time in [].

[0038] Figure 6 shows an example of the SOC change during storage. As shown in the figure, the storage period [t 1e ,t 2e The state of charge (SOC) characteristics of secondary battery Bk in [the specified location] may change over time in different storage environments (storage environments I and II in Figure 5). Therefore, by calculating the SOC change during storage by referring to the storage environment information, it is possible to reflect the differences in SOC characteristics over time according to the storage environment (temperature, humidity, etc.) in the calculation.

[0039] Note: Storage period [t 1e ,t 2e During this period, charging and discharging of the secondary battery Bk are basically not performed. Therefore, during the storage period [t 1e ,t 2e The fluctuation (decrease) in the state of charge (SOC) of the secondary battery Bk in [ ] suggests the amount of self-discharge of the secondary battery Bk.

[0040] Returning to Figures 4 and 5, the profile calculation unit 23 receives storage environment information and the initial use end date t. 1e , and the planned start date for secondary use 2e Based on this, the temperature change during storage Ts(t) is calculated (S330). In particular, the temperature change during storage Ts(t) in this embodiment is calculated based on the storage period [t 1e ,t 2e This is given as a function representing the change over time of the storage temperature Ts of the secondary battery Bk in [ ]. Note that if the storage temperature Ts does not change over time, such as when the temperature is kept constant according to the storage equipment, the storage temperature change Ts(t) can be set to a constant.

[0041] Then, the profile calculation unit 23 calculates the storage degradation profile P from the storage SOC transition and storage temperature transition Ts(t). Bk (t) is calculated (S340).

[0042] Specifically, first, the profile calculation unit 23 calculates the first unit degradation amount ΔD1(t) by multiplying the SOC transition during storage by a predetermined gain K1 (S3401). Here, the first unit degradation amount ΔD1(t) is calculated based on the storage period [t 1e ,t 2eThis is a function that represents the amount of degradation (decrease in SOH) per unit time (unit days) in response to the change in SOC of the secondary battery Bk during [a certain period]. Here, the amount of degradation due to storage degradation of the secondary battery Bk is calculated from the end date of primary use t 1e The gain K1 is proportional to the square root of the elapsed days t, starting from the base point, 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) after considering the elapsed days t and the change (decrease) in SOC corresponding to the elapsed days t.

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

[0044] Then, the profile calculation unit 23 determines the initial usage end date t 1e The storage degradation degree D(t) is calculated as the sum (integral value) of the products of the first unit degradation amount ΔD1(t) and the second unit degradation amount ΔD2(t) at an arbitrary number of days t elapsed from the starting point (S3403). That is, the storage degradation degree D(t) is calculated from the initial use end date t 1e It is defined as a function that represents the decrease in SOH from [start date] to the elapsed number of days t.

[0045] Furthermore, the degree of deterioration during storage D(t) is defined as the date of initial use t. 1s and primary use end date t 1e The primary usage period is determined by [t 1s ,t 1eIt is preferable to take into account the ] in the calculation. For example, the degree of deterioration during storage D(t) obtained by the calculation logic in S3401 to S3403 is used as the primary use period [t 1s ,t 1e A calculation logic can be employed that performs a correction that increases the longer the ] period is. 1s ,t 1e By considering the aging degradation of the secondary battery Bk according to its length, the degree of degradation during storage D(t) can be determined with greater precision.

[0046] Furthermore, the profile calculation unit 23 determines the initial usage end date t 1e The storage degradation profile P is obtained by subtracting the storage degradation rate D(t) from the SOH of the secondary battery Bk (hereinafter also referred to as "initial SOH") Bk (t) is calculated (S3404). That is, storage degradation profile P Bk (t) is the primary usage end date t 1e This will be determined as a function representing the change over time of the SOH of the secondary battery Bk from the time point to the number of days t. In particular, the storage degradation profile P Bk (t) t=t 2e The value obtained by applying this is the planned start date for secondary use t. 2e This will be determined as the estimated value (predicted degradation state) of the SOH of the secondary battery Bk in that case.

[0047] In particular, according to the logic of the above degradation profile calculation, the storage degradation profile P specific to the secondary battery Bk is obtained. Bk (t) can be obtained. That is, for each secondary battery B1, B2, B3..., a unique storage degradation profile P can be obtained for each. B1 (t), P B2 (t), P B3 (t) ... can be determined.

[0048] Figure 7 shows the storage degradation profiles P for each secondary battery B1, B2, and B3. B1 (t), P B2 (t), P B3 An example of (t) is shown. The above degradation profile calculation is performed with the input parameter (first use end date t).1e - Scheduled start date t of secondary use 2e By applying to each secondary battery B1, B2, B3 (each battery ID) with different (e.g., scheduled start date t of secondary use and storage environment information, etc.), the storage degradation profiles P B1 (t), P B2 (t), P B3 (t) specific to each of the secondary batteries B1, B2, B3 shown in FIG. 7 can be obtained.

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

[0050] The operation and effect of the configuration of the battery degradation state estimation device 20 of the present embodiment described above will be described.

[0051] In the present embodiment, a battery degradation state estimation device 20 for estimating the degradation state at the time of providing secondary use of the secondary battery Bk mounted on the vehicle Vk is provided. This battery degradation state estimation device 20 calculates the storage degradation profile P 1e ,t 2e representing the degradation transition during the storage period [t Bk (t) using the profile calculation unit 23, and based on the storage degradation profile P Bk (t), a data generation unit 24 that generates predicted battery state data including the predicted degradation state (predicted SOH) at the time of providing secondary use, and a data output unit 25 that outputs the predicted battery state data to a predetermined external device (external terminal) 40.

[0052] Thereby, according to the secondary battery Bk, the storage period [t 1e ,t 2eConsidering the deterioration transition in [ ], the deterioration state of the secondary battery Bk at the time of secondary use provision is estimated, and a logic for providing (notifying) the estimated deterioration state to the outside is realized. Therefore, it is possible to further improve the estimation accuracy of the deterioration state of the secondary battery Bk at the time of secondary use provision and enhance the reliability of the predicted deterioration state provided to the outside.

[0053] In particular, in the present embodiment, the end date t of the primary use of the secondary battery Bk 1e and the planned start date t of secondary use 2e are further acquired by an acquisition unit (battery state acquisition unit 21). Then, the profile calculation unit 23 calculates a storage deterioration profile P 1e , the planned start date t of secondary use 2e , and based on the storage environment information of the secondary battery Bk, (t). Bk

[0054] Thereby, a logic for further improving the estimation accuracy of the deterioration state of the secondary battery Bk at the time of secondary use provision is realized.

[0055] Furthermore, the battery information acquisition unit 21 further acquires the start date t of the primary use of the secondary battery Bk 1s . Then, the profile calculation unit 23 calculates the storage deterioration profile P 1s from the start date t of the primary use and the end date t of the primary use 1e referring to the primary use period [t 1s , t 1e . Bk (t).

[0056] Thereby, a logic for more accurately estimating the deterioration state of the secondary battery Bk at the time of secondary use provision, taking into account the aging deterioration according to the length of the primary use period [t 1s , t 1e , is realized.

[0057] In particular, in the battery deterioration state estimation device 20 of the present embodiment, the battery information acquisition unit 21 has the end date t of the primary use 1eThe final charge rate (final SOC), which is the charge rate of the secondary battery Bk, is further obtained. Then, the profile calculation unit 23 obtains the storage environment information, final SOC, and the first use end date t. 1e , and the planned start date for secondary use 2e Based on the storage period [t 1e ,t 2e The system calculates the storage charge rate trend (storage SOC trend), which represents the change in state of charge (SOC) over time in [location]. The profile calculation unit 23 also calculates the storage environment information and the initial end date t. 1e , and the planned start date for secondary use 2e Based on the storage period [t 1e ,t 2e The system calculates the storage temperature transition Ts(t) which shows the change in the storage temperature Ts of the secondary battery Bk over time. Furthermore, the profile calculation unit 23 calculates the storage degradation profile P based on the storage SOC transition and the storage temperature transition Ts(t). Bk Perform the operation on (t).

[0058] This allows for a storage period [t] corresponding to the secondary battery Bk. 1e ,t 2e ] and storage environment are taken into consideration to create a storage degradation profile P Bk A more specific logic for calculating (t) is implemented.

[0059] [Second Embodiment] The second embodiment will be described below. Elements similar to those in the first embodiment will be denoted by the same reference numerals, and their descriptions will be omitted.

[0060] Figure 8 is a block diagram showing the 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 uses the above-mentioned initial use start date t 1s , primary use end date t 1e , Scheduled start date for secondary use 2eIn addition to the final SOC, information indicating the location of the vehicle Vk (hereinafter also simply referred to as "vehicle location information") is transmitted to the battery degradation state estimation device 20. The on-board battery management server 30 has previously acquired vehicle location information (GPS information) for each vehicle V through communication with each on-board terminal VT, and stores this information in a database (not shown) linked to the vehicle ID. When the on-board 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 location information linked to the vehicle ID to the battery degradation state estimation device 20.

[0061] Furthermore, the battery information acquisition unit 21 in the battery degradation state estimation device 20 of this embodiment outputs vehicle position information acquired from the on-board battery management server 30 to the profile calculation unit 23, along with the input parameters described in the first embodiment.

[0062] Figure 9 is a flowchart illustrating the degradation profile calculation (S300) in this embodiment.

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

[0064] When the profile calculation unit 23 determines that storage environment information exists, it calculates the storage degradation profile P using the same calculation logic as in the first embodiment. Bk (t) is calculated (S310~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 processes S360 to S390 to create a storage degradation profile P Bk Perform the operation on (t).

[0066] Specifically, the profile calculation unit 23 first estimates the storage location of the secondary battery Bk from the vehicle location information (S360). More specifically, the profile calculation unit 23 generates a predetermined area including the location where the vehicle Vk is mainly located from the vehicle location information, and estimates the storage location by identifying a facility within that area that can store the secondary battery Bk by referring to a predetermined map database or the like.

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

[0068] Figure 10 illustrates an example of the outdoor temperature trend Te(t). The solid line in Figure 10 represents the outdoor temperature trend Te(t), using the annual average temperature data for the region to which the estimated storage location α belongs. The dashed line represents the outdoor temperature trend Te(t), using the annual average temperature data for the region to which other storage locations β belong. In particular, the annual average temperature data shown in Figure 10 can be obtained by referring to external databases that hold meteorological data for each region. Note that the outdoor temperature trend Te(t) does not include the initial usage end date t. 1e and the planned start date for secondary use 2e By applying this, the storage period [t 1e ,t 2e The change in ambient temperature Te over time (hatched area in Figure 10) can be obtained.

[0069] Figure 11 shows a block diagram illustrating the specific configuration for realizing the degradation profile calculation (S380, S390, and S340) in this embodiment.

[0070] The profile calculation unit 23 calculates the state of temperature (SOC) change during storage from the ambient temperature change Te(t) (S380). In particular, the profile calculation unit 23 calculates the ambient temperature change Te(t) and the initial end date t 1e , and the planned start date for secondary use 2eFrom storage period [t 1e ,t 2e The change in SOC over time is determined according to the characteristics of the secondary battery Bk in [ ], and this is recorded as the SOC change during storage. Note that the storage period [ t 1e ,t 2e In cases where the fluctuation of SOC due to the passage of time or changes in ambient temperature Te is relatively small, a configuration may be adopted in which the change in SOC 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 change Ts(t) from the ambient temperature change Te(t) (S380). In particular, the profile calculation unit 23 calculates the initial end date t on the ambient temperature change Te(t) 1e and the planned start date for secondary use 2e By applying this, the storage period [t 1e ,t 2e A function of the change in ambient temperature Te over time is generated, and this function is obtained as the temperature change Ts(t) during storage.

[0072] Then, the profile calculation unit 23 uses the obtained storage SOC transition and storage temperature transition Ts(t) to execute the same calculation logic (S3401~S3404) as in the first embodiment to determine the storage degradation profile P Bk Find (t) (S340).

[0073] The effects and benefits of the configuration of the battery degradation state estimation device 20 of this embodiment, as described above, will now be explained.

[0074] In the battery degradation state estimation device 20 of this embodiment, the battery information acquisition unit 21 determines the initial end date of use t 1e The final charge rate (final state of charge), which is the charge rate of the secondary battery Bk, is further obtained. 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 on which the secondary battery Bk was installed, and obtains the ambient temperature trend Te(t) of the region including the storage location based on the estimated storage location.

[0075] Furthermore, the profile calculation unit 23 calculates the final SOC and the initial usage end date t. 1e , and the planned start date for secondary use 2e Based on the storage period [t 1e ,t 2e The system calculates the state of charge (SOC) during storage, which represents the change in charge level over time. The profile calculation unit 23 also calculates the ambient temperature change Te(t) and the end date of primary use t. 1e , and the planned start date for secondary use 2e Based on the storage period [t 1e ,t 2e The storage temperature transition Ts(t) shows the change in the storage temperature Ts of the secondary battery Bk over time. Then, the profile calculation unit 23 calculates the storage degradation profile P based on the storage SOC transition and the storage temperature transition Ts(t). Bk Perform the operation on (t).

[0076] This means that even if the storage environment information for the secondary battery Bk cannot be obtained for reasons such as the storage location information for the secondary battery Bk not being recorded in the storage information DB27, the storage degradation profile P Bk This allows us to implement a concrete logic that enables the operation of (t).

[0077] Although various embodiments of the present invention have been described above, the configurations described in each of the above embodiments represent only a part 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 initial disclosure scope of this application includes a method for estimating the degradation state of a secondary battery Bk installed in a vehicle Vk at the time of secondary use. This method estimates the storage period [t] between the end of primary use of the secondary battery Bk and its provision for secondary use. 1e ,t 2e Storage degradation profile P representing the degradation progression in ] Bk (t) is calculated, and the storage degradation profile P Bk Based on (t), predicted battery state data including the predicted degradation 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 in the original application includes a battery status information provision program for estimating the degradation state of a secondary battery Bk installed in a vehicle Vk when it is provided for secondary use, and a computer-readable storage medium on which the battery status information provision program is stored.

[0080] In particular, this battery status information provision program tells the computer (i) the storage period [t] from the end of primary use of the secondary battery Bk until it is provided for secondary use. 1e ,t 2e Storage degradation profile P representing the degradation progression in ] Bk (t) is calculated, and (ii) storage degradation profile P Bk Based on (t), predictive battery state data including the predicted degradation state (predicted SOH) at the time of secondary use provision is generated, and (iii) the predictive battery state data is output to a predetermined external device (external terminal) 40.

Claims

1. A battery degradation state estimation device for estimating the degradation state of a secondary battery installed in a vehicle when it is provided for secondary use, A profile calculation unit calculates a storage degradation profile that represents the degradation progression during the storage period from the end of primary use of the secondary battery until it is provided for secondary use, A data generation unit generates predicted battery state data, including the predicted degradation state at the time of secondary use provision, based on the storage degradation profile. The system includes a data output unit that outputs the predicted battery status data to a predetermined external device, The system further includes an acquisition unit that acquires the end date of primary use and the planned start date of secondary use of the aforementioned secondary battery. The aforementioned profile calculation unit, Based on the aforementioned end date of primary use, the planned start date of secondary use, and the storage environment information of the secondary battery, the storage degradation profile is calculated. Battery degradation state estimation device.

2. A battery degradation state estimation device according to claim 1, The acquisition unit further acquires the date of the start of primary use of the secondary battery, The aforementioned profile calculation unit, The storage degradation profile is calculated by referring to the primary use period determined from the primary use start date and the primary use end date. Battery degradation state estimation device.

3. A battery degradation state estimation device according to claim 1, The acquisition unit further acquires the final charge rate, which is the charge rate of the secondary battery on the end of the primary use date. The aforementioned profile calculation unit, Based on the storage environment information, the final charge rate, the end date of primary use, and the planned start date of secondary use, the storage charge rate trend, which represents the change in the charge rate over time during the storage period, is calculated. Based on the storage environment information, the end date of primary use, and the planned start date of secondary use, the storage temperature trend showing the change in the storage temperature of the secondary battery over time during the storage period is calculated. Based on the changes in charge level during storage and the changes in temperature during storage, the storage degradation profile is calculated. Battery degradation state estimation device.

4. A battery degradation state estimation device according to claim 1, The acquisition unit further acquires the final charge rate, which is the charge rate of the secondary battery on the end of the primary use date. The aforementioned profile calculation unit, Based on the location information of the vehicle in which the secondary battery was installed, the storage location of the secondary battery is estimated. Based on the estimated storage location, the trend of outside temperature in the area including the storage location is calculated. Based on the aforementioned final charge rate, the aforementioned end date of primary use, and the aforementioned planned start date of secondary use, the storage charge rate trend, which represents the change in the charge rate over time during the storage period, is calculated. Based on the aforementioned ambient temperature trend, the aforementioned end date of primary use, and the aforementioned planned start date of secondary use, the storage temperature trend, which shows the change in the storage temperature of the secondary battery over time during the storage period, is calculated. Based on the changes in charge level during storage and the changes in temperature during storage, the storage degradation profile is calculated. Battery degradation state estimation device.

5. A method for estimating the degradation state of a battery when a secondary battery installed in a vehicle is provided for secondary use, A storage degradation profile is calculated that represents the degradation progression during the storage period from the end of the primary use of the secondary battery until it is provided for secondary use. Based on the storage degradation profile, predictive battery status data including the predicted degradation state at the time of secondary use and provision is generated. The predicted battery status data is output to a predetermined external device. Further obtain the end date of primary use and the planned start date of secondary use of the aforementioned secondary battery, In the calculation of the storage degradation profile, Based on the aforementioned end date of primary use, the planned start date of secondary use, and the storage environment information of the secondary battery, the storage degradation profile is calculated. A method for estimating the state of battery degradation.

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