Power storage device and mobile body

Abstract

Provided is a power storage device and a mobile object that facilitate the transfer of battery status. [Solution] The energy storage device 10A includes a cell 12A, a management device that manages the cell 12A, an estimation unit 21A that estimates battery state parameters that represent the state of the cell 12A based on battery history data at a predetermined timing, and a storage unit 22A that saves the battery state parameters as a battery state file 30, and the storage unit 22A saves the battery state file 30 in a manner that allows it to be output.

Description

[Technical Field]

[0001] The present disclosure relates to a power storage device and a mobile object. [Background technology]

[0002] In recent years, the reuse of secondary batteries installed in electric vehicles (EVs) and the like has been actively studied. For example, a method for recycling secondary batteries described in Patent Document 1 includes a remaining capacity inspection step of measuring the remaining capacity of multiple unit batteries obtained by dismantling a used battery pack, a step of selecting the unit batteries based on the measured remaining capacity, and a step of assembling a battery pack using the selected unit batteries. This method for recycling secondary batteries makes it possible to accurately evaluate whether each unit battery is suitable for reuse and to reconstruct a battery pack using unit batteries suitable for reuse. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-152110 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors came up with the idea of ​​transferring information about the battery's degradation state from the primary battery utilization system to the secondary battery utilization system when a battery is repurposed or replaced at a battery exchange station. By transferring the battery's degradation state in this way, it is possible to omit or simplify battery performance verification tests before the battery is repurposed. Furthermore, the management device of the secondary utilization system that has transferred the battery's degradation state can continue to monitor the battery's degradation with minimal error as it is repurposed or replaced.

[0005] On the other hand, storing battery history data over a long period of time in a management device for the purpose of transferring the battery's deterioration status is not desirable from the perspective of data size. While the data size issue can be resolved by storing battery history data on the cloud via the Internet, there are cases where batteries are used in situations where Internet communication is not possible, making it difficult to prevent data loss.

[0006] The present disclosure was completed in light of the above circumstances, and aims to provide a power storage device and a mobile body that facilitates the transfer of the state of a battery. [Means for solving the problem]

[0007] The energy storage device of the present disclosure is an energy storage device that includes a battery, a management device that manages the battery, an estimation unit that estimates battery state parameters that represent the state of the battery based on battery history data at a predetermined timing, and a storage unit that saves the battery state parameters as a battery state file, wherein the storage unit saves the battery state file in a manner that allows it to be output. Here, the "battery" may be a power storage cell, a power storage module, or a power storage bank (also called a power storage string) in which a plurality of power storage modules are connected in series.

[0008] A moving body according to the present disclosure is an electrically powered moving body including the above-described power storage device and a moving body main body on which the power storage device is replaceably mounted. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a power storage device and a mobile object that facilitates the transfer of the state of a battery. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a battery reuse system according to the first embodiment. [Figure 2] FIG. 2 is a block diagram showing a battery reuse system according to the second embodiment. [Figure 3] FIG. 3 is a block diagram showing a battery exchange system according to the third embodiment. [Figure 4] Figure 4 shows the discharge curve of the initial battery. [Figure 5] Figure 5 shows the discharge curve of a battery with significant positive electrode degradation. [Figure 6] Figure 6 shows the discharge curve of a battery with large negative electrode film growth. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. [1] The energy storage device of the present disclosure includes a battery, a management device that manages the battery, an estimation unit that estimates battery state parameters that represent the state of the battery based on battery history data at a predetermined timing, and a storage unit that saves the battery state parameters as a battery state file, and the storage unit saves the battery state file in an outputtable manner.

[0012] Here, the "battery state parameters" may include multiple battery state parameters. The "battery state file" may include multiple battery state parameters, or may be electronic data including the latest (most recently estimated) multiple battery state parameters of the battery. The term "estimation" includes the meaning of calculation. The "output" of the battery state file may include having an external reading device read the battery state, or having a management device of a secondary battery utilization system read the battery state.

[0013] With this configuration, the battery status can be transferred using the battery status file without having to store long-term battery history data, thereby reducing the data size required for transferring the battery status.

[0014] Unlike the configuration of the present disclosure, for example, when battery history data is transmitted via internet communication to a server, etc., data loss can be unavoidable. However, with the above configuration, by storing the battery status file in a storage unit provided in the power storage device, problems associated with such data loss (such as a decrease in the accuracy of estimating battery deterioration) can be avoided.

[0015] [2] In the above [1], it is preferable that the battery state file stored in the storage unit is updated each time the estimation unit estimates the battery state parameter, and the estimation unit estimates the battery state parameter based on the battery state file stored in the storage unit and the battery history data from the previous estimation of the battery state parameter to the current estimation.

[0016] With this configuration, by updating the battery status file, the battery history data up to that point can be compressed and represented in the latest battery status file, thereby further reducing the data size required to transfer the battery status while maintaining the accuracy of the battery status estimation.

[0017] [3] Preferably, the power storage device of [1] or [2] above further comprises a presentation unit that presents the battery status file or information obtained from the battery status file to an external device. Here, "presentation" includes the meaning of transmission.

[0018] With this configuration, the presentation unit presents the battery status file and information obtained from it to the outside, so that the battery status parameters can be utilized even while the power storage device is in use in the primary usage system or the secondary usage system. Furthermore, it becomes possible to change the control of the system or make appropriate operational suggestions according to the internal state of the battery expressed by the battery status parameters.

[0019] [4] In any one of [1] to [3] above, it is preferable that the batteries and the storage units are provided in plurality, each of which stores the battery status file of each of the batteries and is assembled to each of the batteries.

[0020] With this configuration, since each storage unit is attached to each battery, it is easy to associate the battery status file with each battery. Therefore, even if multiple batteries included in the power storage device are used in different secondary utilization systems, the battery status parameters of each battery can be transferred to each secondary utilization system.

[0021] [5] The moving body of the present disclosure is an electrically powered moving body including any one of the power storage devices [1] to [4] above and a moving body main body on which the power storage device is replaceably mounted.

[0022] [6] In the above [5], it is preferable that the mobile body includes a usage tendency estimation unit that estimates usage tendencies of the mobile body based on the battery state parameters, and a usage tendency storage unit that stores the usage tendencies.

[0023] With this configuration, when a power storage device is replaced at a battery exchange station, etc., it is possible to refer to the usage tendency of the mobile object estimated from the battery state parameters. This makes it possible to select an optimal power storage device from among the power storage devices in stock, taking into consideration the usage tendency, and to replace the used power storage device.

[0024] [Details of the embodiments of the present disclosure] The present disclosure will be described below with reference to exemplary embodiments. The present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0025] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to FIG. 1. FIG. 1 shows a battery reuse system S1 including a power storage device 10A according to this embodiment. In the battery reuse system S1, a power storage device 10B is reconstructed using at least one cell 12A included in the power storage device 10A. The power storage device 10A is used, for example, in an EV or the like. The power storage device 10B is used, for example, in a forklift or an AGV (Automatic Guided Vehicle). That is, the cell 12A is first used for an EV or the like, and after its capacity is reduced, is secondarily reused for another application such as a forklift or an AGV. Note that the use of the power storage device of the present disclosure is not limited to the above and may also be, for example, an energy storage system (ESS). Hereinafter, when multiple identical components are used, only some of the components may be designated by reference numerals, and the reference numerals of the other components may be omitted.

[0026] The power storage device 10A of this embodiment includes a plurality of power storage modules 11A and a BMU (battery management unit) 20A. Each power storage module 11A includes a cell 12A and a CMU (cell management unit) 13A. The cells 12A of the plurality of power storage modules 11A are connected in series to each other.

[0027] The cell 12A is a secondary battery that can be repeatedly charged and discharged, such as a lithium ion battery.

[0028] The CMU 13A includes a voltage sensor that measures the voltage of the cell 12A, a temperature sensor that measures the temperature of the cell 12A, etc. The BMU 20A is configured to be able to communicate with the CMU 13A. The BMU 20A acquires data on currents flowing through the multiple power storage modules 11A, and voltage data and temperature data measured by the CMU 13A of each power storage module 11A. The BMU 20A and CMU 13A are management devices that manage the cells 12A.

[0029] The BMU 20A includes a control unit configured with a CPU (Central Processing Unit) and other components, and memories such as a ROM (Read Only Memory) and a RAM (Random Access Memory).

[0030] The BMU 20A of this embodiment includes an estimation unit 21A and a storage unit 22A. The estimation unit 21A estimates battery state parameters based on battery history data at a predetermined timing. Here, the predetermined timing may be a predetermined regular timing (for example, once a week) or may be a timing desired by the user of the power storage device 10A.

[0031] The battery history data is time-series data such as the current-carrying time, current value, temperature, voltage, SOC (state of charge) of the cell 12A, etc. The battery history data is temporarily stored in the memory of the BMU 20A.

[0032] The battery state parameters are parameters that indicate the state of the cells 12A, including the deterioration state of the cells 12A. The battery state parameters may include at least one of the following items, for example: Deterioration of the positive electrode due to current flow Deterioration of the positive electrode over time - Amount of negative electrode film growth due to current flow - Amount of growth of the negative electrode film over time Increase in battery thickness due to current flow (or increase in restraint reaction force) Increase in battery thickness over time (or increase in restraint reaction force) Resistance Increase

[0033] The estimation unit 21A estimates battery state parameters at a predetermined timing by, for example, inputting battery history data into a simulator stored in advance in a memory. The estimation unit 21A stores the estimated battery state parameters as a battery state file 30 in the storage unit 22A.

[0034] When the battery status file 30 is saved in the saving unit 22A, the battery history data that was taken into consideration to create this saved battery status file 30 is deleted from memory. Therefore, the BMU 20A can save the status of the cells 12A using the battery status file 30 without saving battery history data over a long period of time. In other words, the status of the cells 12A can be saved with a small data size.

[0035] In this embodiment, the battery state file 30 stored in the storage unit 22A is updated every time the estimation unit 21A estimates a battery state parameter. When a predetermined timing arrives with the battery state file 30 already stored in the storage unit 22A, the estimation unit 21A estimates the battery state parameter based on the battery state file 30 stored in the storage unit 22A and battery history data from the previous estimation of the battery state parameter to the current estimation, and creates a new battery state file 30. The previous battery state file 30 stored in the storage unit 22A is then overwritten with the newly created battery state file 30.

[0036] The storage unit 22A stores the battery status file 30 in an outputtable manner. That is, the battery status file 30 stored in the storage unit 22A can be read by an external device. For example, the battery reuse system S1 includes a reading device 31 that reads the battery status file 30 from the storage unit 22A, a database 32 for storing the battery status file 30 read by the reading device 31, and a writing device 33 that copies the battery status file 30 stored in the database 32 to a management device (BMU 20B) at the secondary usage destination.

[0037] The BMU 20A of this embodiment may further include a presentation unit 23A that externally presents the battery status file 30 or information 40 obtained from the battery status file 30. Here, the information 40 obtained from the battery status file 30 includes, for example, the state of health (SOH) of the cell 12A.

[0038] The information 40 may also include whether the cell 12A can be reused for the first time, as determined based on the battery state parameters. For example, if the battery state parameters are within a predetermined appropriate range, it may be recommended that the cell 12A be reused for the first time. In such a case, the estimation unit 21A may determine whether the battery state parameters are within the predetermined appropriate range, and if it is determined that the battery state parameters are outside the predetermined appropriate range, the presentation unit 23A may present a message to the outside, encouraging the user to reuse the cell 12A.

[0039] The external device to which the battery status file 30 or the information 40 is presented is specifically a higher-level device 41. The higher-level device 41 may be, for example, an ECU (Electronic Control Unit) of an EV or the like, or may be an information terminal carried by a user.

[0040] The secondary-use power storage device 10B is configured functionally in substantially the same manner as the power storage device 10A. The power storage device 10B includes a plurality of power storage modules 11B and a BMU 20B. The number of power storage modules 11B included in the power storage device 10B may be different from the number of power storage modules 11A included in the power storage device 10A. The power storage module 11B includes a battery 12B and a CMU 13B.

[0041] Cells 12A whose capacity has been reduced due to primary use can be used as batteries 12B. Furthermore, power storage module 11A including cells 12A whose capacity has been reduced may be used as power storage module 11B.

[0042] The BMU 20B includes a control unit and a memory. A writing device 33 can be used to write the battery status file 30 stored in the database 32 to the memory. This allows the secondary usage BMU 20B to take over the status of the cell 12A whose capacity has decreased due to primary usage. The BMU 20B may include an estimation unit 21B, a storage unit 22B, and a presentation unit 23B, similar to the BMU 20A. The storage unit 22B may store the battery status file 30 of the cell 12A after primary usage.

[0043] When secondary use begins, the battery status file 30 is handed over to the management device of the secondary use destination, so that the status of the cells 12A after primary use can be continuously monitored. Also, performance confirmation tests of the cells 12A after primary use can be omitted or simplified.

[0044] (Effects of the first embodiment) (1-1) The energy storage device 10A according to the first embodiment includes a cell 12A, management devices (BMU 20A and CMU 13A) that manage the cell 12A, an estimation unit 21A that estimates battery state parameters that represent the state of the cell 12A based on battery history data at a predetermined timing, and a storage unit 22A that stores the battery state parameters as a battery state file 30, and the storage unit 22A stores the battery state file 30 in a manner that allows it to be output.

[0045] With this configuration, even if battery history data is not stored over a long period of time, the state of the cell 12A can be transferred using the battery state file 30. Therefore, the data size required for transferring the state of the cell 12A can be reduced.

[0046] Unlike the configuration of the present disclosure, for example, when battery history data is transmitted to a server or the like via internet communication, data loss can be unavoidable. However, with the above configuration, by storing battery status file 30 in storage unit 22A included in power storage device 10A, problems associated with such data loss (such as a decrease in the accuracy of estimating deterioration of cell 12A) can be avoided.

[0047] (1-2) In embodiment 1, the battery state file 30 stored in the storage unit 22A is updated each time the estimation unit 21A estimates a battery state parameter, and the estimation unit 21A estimates the battery state parameter based on the battery state file 30 stored in the storage unit 22A and battery history data from the time of the previous estimation of the battery state parameter to the time of the current estimation.

[0048] With this configuration, by updating the battery status file 30, it is possible to compress and represent the battery history data up to that point in the latest battery status file 30. Therefore, it is possible to further reduce the data size required to take over the state of the cell 12A while maintaining the accuracy of the state estimation of the cell 12A.

[0049] (1-3) The power storage device 10A according to the first embodiment further includes a presentation unit 23A that presents the battery status file 30 or information 40 obtained from the battery status file 30 to the outside (host device 41).

[0050] With this configuration, the presentation unit 23A presents the battery state file 30 and information 40 obtained therefrom to the outside, so that the battery state parameters and the like can be utilized even while the power storage device 10A is in use. Also, it becomes possible to change the control of the system or make appropriate operational suggestions according to the internal state of the cell 12A expressed by the battery state parameters.

[0051] <Embodiment 2> A second embodiment of the present disclosure will be described with reference to Fig. 2. Fig. 2 shows a battery reuse system S2 including a power storage device 110A according to the second embodiment. Hereinafter, descriptions of the same configurations, actions, and effects as those of the first embodiment may be omitted.

[0052] The power storage device 110A includes a plurality of power storage modules 111A and a BMU 120A. Each power storage module 111A includes a cell 12A and a CMU 113A. The BMU 120A includes an estimation unit 21A and a presentation unit 23A.

[0053] In this embodiment, the BMU 120A does not include the storage unit 22A of the first embodiment. However, a storage unit 114A that functions similarly to the storage unit 22A is provided in the CMU 113A. That is, the battery status file 30 of the cell 12A included in each power storage module 111A is stored in the storage unit 114A of each power storage module 111A. Therefore, the battery status file 30 can be managed in physical association with the cell 12A.

[0054] The secondary-use power storage device 110B has the same functional configuration as the power storage device 110A. The power storage device 110B includes a plurality of power storage modules 111B and a BMU 120B. Each power storage module 111B includes a battery 12B and a CMU 113B. The BMU 120B includes an estimation unit 21B and a presentation unit 23B. The CMU 113B includes a storage unit 114B.

[0055] In the battery reuse system S2, a power storage module 111A including a cell 12A with reduced capacity is incorporated into a power storage device 110B as a power storage module 111B for secondary use. This system allows the transfer of the cell 12A and the battery status file 30 (battery status parameters) to be performed simultaneously simply by incorporating the power storage module 111A into the power storage device 110B at the secondary use destination. Therefore, even if there are multiple secondary use destinations for the cell 12A, it is possible to avoid errors in associating the cell 12A with the battery status file 30. Furthermore, the battery status file 30 can be easily transferred without using the reading device 31, database 32, and writing device 33, as in the first embodiment.

[0056] (Effects of the second embodiment) (2-1) In the power storage device 110A according to the second embodiment, a plurality of cells 12A and a plurality of storage units 114A are provided, and each storage unit 114A stores the battery state file 30 of each cell 12A and is attached to each cell 12A.

[0057] According to this configuration, since each storage unit 114A is attached to each cell 12A, it becomes easy to handle the battery status file 30 in association with each cell 12A. Therefore, even if multiple cells 12A included in the power storage device 110A are used in different secondary use systems, the battery status parameters of each cell 12A can be taken over to each secondary use system.

[0058] <Embodiment 3> A third embodiment of the present disclosure will be described with reference to Fig. 3 to Fig. 6. Fig. 3 shows a battery exchange system S3 including a mobile object 200 and a battery exchange station 260 according to the third embodiment. In the battery exchange system S3, when the capacity of a cell 12A of a power storage device 10A provided in the mobile object 200 decreases, the power storage device 10A is exchanged with one of charged power storage devices 10A1 to 10An stocked in the battery exchange station 260. Hereinafter, descriptions of the same configurations, functions, and effects as those of the first embodiment may be omitted.

[0059] The mobile body 200 is electrically powered and uses a power storage device 10A (cell 12A) as a driving power source. The mobile body 200 is, for example, an EV. The mobile body 200 includes the power storage device 10A and a mobile body main body 250. The power storage device 10A is replaceably mounted on the mobile body main body 250. That is, the power storage device 10A can be removed from the mobile body main body 250. Furthermore, the mobile body 200 can be configured by connecting the power storage device 10A to the mobile body main body 250.

[0060] The mobile body 250 includes a control unit and a memory configured to be able to communicate with the BMU 20A. The mobile body 250 includes a usage tendency estimation unit 251 and a usage tendency storage unit 252. The usage tendency estimation unit 251 estimates the usage tendency of the mobile body 200 based on the battery state file 30 (battery state parameters) stored in the storage unit 22A. Here, the usage tendency includes, for example, the ratio of charge / discharge and rest time, the SOC at the time of replacement, etc. The usage tendency is stored in the usage tendency storage unit 252. The usage tendency storage unit 252 may further store the battery state file 30.

[0061] The battery exchange station 260 includes n power storage devices 10A1, 10A2, . . . , 10An and an exchange support device 261. The power storage devices 10A1 to 10An have the same configuration as the power storage device 10A. The power storage devices 10A1 to 10An are fully charged by a charger (not shown) provided in the battery exchange station 260.

[0062] The exchange support device 261 may be, for example, a computer. The exchange support device 261 is connected to the BMU 20A of the power storage devices 10A1 to 10An. This allows the exchange support device 261 to refer to the battery status file 30 of the power storage devices 10A to 10An and to read the status of each cell 12A.

[0063] Furthermore, the exchange support device 261 is capable of communicating with the usage trend storage unit 252 and can read the usage trends of the user. Furthermore, the exchange support device 261 can read the battery status file 30 of the power storage device 10A to be replaced by communicating with the usage trend storage unit 252 or the BMU 20A of the power storage device 10A mounted on the mobile object 200.

[0064] Exchange support device 261 includes an operation unit 262, a display unit 263, and a selection unit 264. By operating operation unit 262, an operator at battery exchange station 260 or a user of mobile object 200 (hereinafter referred to as operator) can display on display unit 263 the battery state file 30 of each power storage device 10A, 10A1 to 10An, the usage tendency of power storage device 10A, the selection result by selection unit 264, etc.

[0065] The selection unit 264 refers to the usage trends of the user from the usage trend storage unit 252 and also refers to the battery state file 30 from the storage unit 22A of the power storage devices 10A1-10An, and thereby selects the power storage device 10Ai (i is any of 1 to n) that is most suitable for replacement among the power storage devices 10A1-10An for replacement (selection process). The selection process is executed, for example, when the mobile object 200 is parked in a space for replacing the power storage device 10A in the battery exchange station 260, or when an operator operates the operation unit 262 to instruct the selection unit 264 to execute the selection process.

[0066] After the selection process is performed, the selection unit 264 displays the location information of the power storage device 10Ai suitable for replacement selected by the selection process on the display unit 263, and prompts the worker to exchange the used power storage device 10A for the replacement power storage device 10Ai. The used power storage device 10A is connected to a charger in the battery exchange station 260 and is charged.

[0067] Next, the selection criteria for the optimum power storage device 10Ai by the selection unit 264 will be described. Power storage device 10Ai is selected, for example, on the assumption that the user's tendency to use mobile object 200 will continue in the future. Power storage device 10Ai may be, for example, one of power storage devices 10A1 to 10An that is expected to be least likely to experience a decrease in capacity or to deteriorate as a result of the user's use of mobile object 200. According to such selection criteria, power storage device 10A can be used efficiently.

[0068] Generally, there are multiple battery degradation modes, so even if batteries have the same capacity after degradation, the internal state of the battery will differ depending on the battery's degradation history. As a result, even if batteries have the same capacity, the way they subsequently deteriorate will differ.

[0069] Below, we consider the case where cell 12A is a lithium-ion battery (positive electrode: ternary NCM523 secondary particle active material, negative electrode: graphite). The main causes of capacity degradation in such cell 12A are a decrease in the capacity of the positive electrode and film growth on the negative electrode. It is known that repeated charge-discharge cycles with large fluctuations in SOC result in a significant decrease in the capacity of the positive electrode. It is also known that film growth on the negative electrode has a significant effect over time.

[0070] The cell voltage of cell 12A is the difference between the positive electrode potential and the negative electrode potential. When the cell voltage reaches a preset battery lower limit voltage, cell 12A is deemed unable to discharge. In other words, the actual capacity of cell 12A is determined by the amount of electricity discharged from a fully charged state until the cell voltage of cell 12A reaches the battery lower limit voltage. Figure 4 shows the initial discharge characteristics of cell 12A. In detail, Figure 4 is a graph plotting the positive electrode potential, negative electrode potential, and cell voltage against the capacity of cell 12A. In the initial state, the ends of the negative electrode curve and the positive electrode curve are close to each other.

[0071] When cell 12A deteriorates under repeated cycles with large SOC fluctuations, the positive electrode capacity decreases significantly, as shown in Figure 5. As a result, the end of the cell voltage curve (end of discharge) is limited by the end of the positive electrode curve. On the other hand, even at the end of discharge of cell 12A, the negative electrode curve has not yet reached its end.

[0072] When cell 12A deteriorates under storage conditions with little charging or discharging, the negative electrode capacity decreases significantly due to the growth of a coating on the negative electrode, as shown in Figure 6. As a result, the discharge end of cell 12A is limited by the end of the negative electrode curve. However, even at the end of discharge of cell 12A, the positive electrode curve has not yet reached its end.

[0073] As shown in Figures 5 and 6, when the discharge end of cell 12A is biased and limited to one of the positive and negative electrodes, the other of the positive and negative electrodes still has discharge capacity. In other words, the imbalance in the degradation state of the positive electrode capacity and the negative electrode capacity results in a loss of energy that can be extracted from cell 12A. To reduce this energy loss, it is preferable to use cell 12A so that the degradation state of the positive electrode capacity and the degradation state of the negative electrode capacity are similar.

[0074] The selection unit 264 selects a power storage device 10Ai suitable for replacement so as to eliminate the imbalance in the degradation states of the positive electrode capacity and the negative electrode capacity as described above. Specifically, the selection unit 264 refers to the user's usage trends, and determines that the positive electrode degradation of the power storage device 10A (cell 12A) is small when there is a lot of downtime or when the battery replacement is performed at a relatively high SOC. In such cases, the selection unit 264 assigns to the user a power storage device 10Ai with large positive electrode degradation as shown in FIG. 5.

[0075] Furthermore, the selection unit 264 refers to the usage tendency of the user and determines that the positive electrode deterioration of the power storage device 10A is significant if there is little downtime or if the battery was replaced after being used to a low SOC. In such cases, the selection unit 264 assigns to the user the power storage device 10Ai in which the capacity of the negative electrode curve end is smaller than the capacity of the positive electrode curve end as shown in FIG. 6.

[0076] (Effects of the Third Embodiment) (3-1) The moving body 200 according to the third embodiment is an electrically powered moving body 200 including a power storage device 10A and a moving body main body 250 on which the power storage device 10A is replaceably mounted.

[0077] (3-2) In the third embodiment, the mobile body 250 includes a usage tendency estimation unit 251 that estimates the usage tendency of the mobile body 200 based on the battery state parameters, and a usage tendency storage unit 252 that stores the usage tendency.

[0078] With this configuration, when the power storage device 10A is exchanged at the battery exchange station 260 or the like, it is possible to refer to the usage tendency of the mobile object 200 estimated from the battery state parameters. As a result, it is possible to select the most suitable power storage device 10Ai from among the stock power storage devices 10A1 to 10An in consideration of the usage tendency, and exchange the used power storage device 10A with the selected power storage device. [Explanation of symbols]

[0079] 10A: Power storage device 11A: Energy storage module 12A: Cell (battery) 13A:CMU 20A:BMU 21A: Estimation part 22A: Storage section 23A: Presentation section 30: Battery status file

Claims

1. Batteries and a management device that manages the battery; an estimation unit that estimates a battery state parameter representing a state of the battery based on battery history data at a predetermined timing; a storage unit that stores the battery status parameters as a battery status file, The storage unit stores the battery status file in an outputtable manner.

2. the battery state file stored in the storage unit is updated every time the estimation unit estimates the battery state parameter; 2. The power storage device according to claim 1, wherein the estimation unit estimates the battery state parameter based on the battery state file stored in the storage unit and the battery history data from a previous estimation of the battery state parameter to a current estimation.

3. The power storage device according to claim 1 or 2, further comprising a presentation unit that presents the battery status file or information obtained from the battery status file to an external device.

4. a plurality of the batteries and a plurality of the storage units are provided; 3. The power storage device according to claim 1, wherein each of the storage units stores the battery status file of each of the batteries and is assembled to each of the batteries.

5. The power storage device according to claim 1 or 2; a mobile body on which the power storage device is replaceably mounted.

6. The mobile body according to claim 5 , wherein the mobile body comprises: a usage tendency estimation unit that estimates a usage tendency of the mobile body based on the battery state parameters; and a usage tendency storage unit that stores the usage tendency.

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