Relocation target presentation device of storage battery, relocation target presentation method of storage battery and computer program

Abstract

To provide a relocation target presentation device of a storage battery that device appropriately presents a relocation target for extending a life of a storage battery system including a plurality of storage battery modules.SOLUTION: A relocation target presentation device 100 of a storage battery according to an embodiment comprises: a deterioration calculation unit 52 that calculates a deterioration degree of each of a plurality of storage batteries using a storage battery model including deterioration characteristics of a plurality of storage batteries; a relocation combination calculation unit 54 that outputs an order in which replacement of storage batteries corresponding to a combination of storage batteries replacing an arrangement position is performed on the basis of the deterioration degrees of the plurality of storage batteries; and a relocation number calculation unit 56 that outputs a combination of the storage batteries of the relocation target, on the basis of a life being time until the plurality of storage batteries are used in a predetermined condition for a deterioration degree of any storage battery to exceed a threshold value when the arrangement position of the corresponding storage battery is sequentially replaced according to the order of a list.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] An embodiment of the present invention relates to a storage battery rearrangement target presentation device, a storage battery rearrangement target presentation method, and a computer program. [Background technology]

[0002] Energy stored in storage batteries is used as a power source for various electronic devices. For example, in a storage battery system consisting of a large number of storage battery modules, the degree of deterioration may vary depending on the arrangement of the storage battery modules. When some storage battery modules reach the end of their life due to deterioration, the entire storage battery system may need to be replaced even if other storage battery modules are still in a usable condition. Therefore, in order to extend the life of the storage battery system as a whole, it is desirable for the storage battery modules in the system to reach the end of their life at the same time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6504544 Summary of the Invention [Problem to be solved by the invention]

[0004] In the past, it has been considered to extend the lifespan of a system by, for example, rearranging storage batteries, but unless the storage batteries to be rearranged are appropriately selected when rearranging the storage batteries, the lifespan of the system cannot be extended effectively. In other words, since the deterioration of storage batteries is affected by, for example, shunt current due to differences in internal resistance between storage batteries connected in parallel, and the SOC operating range due to differences in capacity maintenance rate, unless the storage batteries are rearranged appropriately, the effect of extending the lifespan of the storage battery system cannot be fully achieved.

[0005] The embodiments of the present invention have been made in consideration of the above-mentioned circumstances, and aim to provide a battery relocation target presentation device, a battery relocation target presentation method, and a computer program that appropriately present relocation targets for extending the life of a storage battery system that includes multiple storage battery modules. [Means for solving the problem]

[0006] The storage battery relocation target presentation device according to the embodiment includes a deterioration calculation unit that calculates the deterioration level of each of multiple storage batteries using a storage battery model including deterioration characteristics of the multiple storage batteries, a rearrangement combination calculation unit that outputs an order in which the storage batteries are to be rearranged, corresponding to a combination of the storage batteries whose placement positions are to be rearranged, based on the deterioration levels of the multiple storage batteries, and a rearrangement number calculation unit that outputs a combination of the storage batteries to be rearranged based on a lifespan, which is the time until the deterioration level of any of the storage batteries exceeds a threshold value using the multiple storage batteries under specified conditions, when the placement positions of the corresponding storage batteries are sequentially rearranged according to the order in the list. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration of a storage battery rearrangement target presentation device according to an embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of the configuration of a calculation unit of the storage battery rearrangement target presentation device illustrated in FIG. [Diagram 3] FIG. 3 is a diagram illustrating an example of a rearrangement combination list output from the rearrangement combination calculation unit. [Figure 4] FIG. 4 is a diagram for explaining an example of the operation of the storage battery rearrangement target presentation device according to the first embodiment. [Figure 5A] FIG. 5A is a diagram for explaining an example of the effect of the storage battery rearrangement target presentation device and storage battery rearrangement target presentation method according to the first embodiment. [Figure 5B]FIG. 5B is a diagram for explaining an example of the effect of the storage battery rearrangement target presentation device and storage battery rearrangement target presentation method according to the first embodiment. [Figure 5C] FIG. 5C is a diagram for explaining an example of the effect of the storage battery rearrangement target presentation device and storage battery rearrangement target presentation method according to the first embodiment. [Figure 6] FIG. 6 is a diagram for explaining an example of the operation of the rearrangement target presentation device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, a storage battery rearrangement target presentation device, a storage battery rearrangement target presentation method, and a computer program according to embodiments will be described with reference to the drawings.

[0009] In the storage battery rearrangement target presentation device, storage battery rearrangement target presentation method, and computer program of the present embodiment, the storage battery to be rearranged may be a storage battery cell, or may be a storage battery module that combines a plurality of storage battery cells. In the following embodiment, the storage battery rearrangement target presentation device will be described as an example of a case in which a storage battery module is the target for rearrangement.

[0010] FIG. 1 is a diagram illustrating an example of a configuration of a storage battery rearrangement target presentation device according to an embodiment. The battery rearrangement target presentation device 100 of this embodiment includes an input unit 10, an output unit 20, a storage unit 30, a communication unit 40, and a calculation unit 50.

[0011] The input unit 10 is connected to an operation means such as a mouse, a keyboard, or a touch panel, and can acquire input information through user operations. The input unit 10 is also connected to a voice input means such as a microphone, and can acquire input voice input information. The input unit 10 records the acquired input information in the storage unit 30.

[0012] The output unit 20 has a function of outputting information in a visually and aurally recognizable manner. The output unit 20 outputs various information to, for example, a device connected to the storage battery relocation target presentation device 100. The output unit 20 may include, for example, a display means such as a display, or an audio output means such as a speaker, as output means. The output unit 20 outputs visually recognizable information and aurally recognizable information to the output means.

[0013] The communication unit 40 is configured to be able to communicate with other devices via a network such as the Internet or Ethernet (registered trademark). The communication unit 40 can record information received (acquired) from an external device in the storage unit 30, and can transmit information read from the storage unit 30 to the external device.

[0014] The storage unit 30 includes, for example, a main storage unit and an auxiliary storage unit. The main storage unit may include, for example, a read-only memory (ROM) and a random-access memory (RAM). The ROM is a non-volatile memory used exclusively for reading data, and can store data and various setting values ​​used by the calculation unit 50 (described later) when performing various processes. The RAM may be used as a so-called work area for temporarily storing data when the control unit (described later) performs various processes. The main storage unit of this embodiment is, for example, a RAM, and is used as a memory.

[0015] The auxiliary storage unit is a non-transitory computer-readable storage medium of a computer with the calculation unit 50 as its core. The auxiliary storage unit is, for example, an EEPROM (registered trademark) (electric erasable programmable read-only memory), a HDD (hard disk drive), or an SSD (solid state drive). The auxiliary storage unit can store a program executed by the calculation unit 50 described later, data used by the calculation unit 50 in performing various processes, data generated by the processing in the calculation unit 50, or various setting values. The auxiliary storage unit is a memory that stores various information, and stores, for example, data of the calculation results of the calculation unit 50, information on the storage battery to be rearranged (past capacity, past internal resistance, charge / discharge current, SOC range, temperature, number of series / parallel connections, battery deterioration characteristics, etc.), and various parameters used in the calculation (for example, rearrangement execution threshold, etc.). The storage unit 30 may also include a memory or HDD externally attached to the storage battery rearrangement target presentation device 100.

[0016] The calculation unit 50 includes, for example, at least one processor, and can realize various functions described below by software or a combination of software and hardware. The calculation unit 50 can perform a process of presenting storage batteries to be rearranged, for example, by executing a program stored in the storage unit 30.

[0017] FIG. 2 is a diagram illustrating an example of the configuration of a calculation unit of the storage battery rearrangement target presentation device illustrated in FIG. The calculation unit 50 includes a deterioration calculation unit 52, a rearrangement combination calculation unit 54, and a rearrangement number calculation unit 56.

[0018] The deterioration calculation unit 52 receives as input, for example, operating conditions (charge / discharge current, SOC range, temperature), battery capacity, number of series / parallel connections, battery deterioration characteristics, and a rearrangement execution threshold which is the deterioration level at which rearrangement is performed, calculates the deterioration level of each of the multiple storage battery modules using a storage battery model including the deterioration characteristics, and outputs the deterioration level of each of the multiple storage battery modules when the most deteriorated storage battery module reaches the rearrangement execution threshold.

[0019] The deterioration calculation unit 52 may periodically calculate the deterioration levels of multiple battery modules and compare the calculation results with the rearrangement execution threshold, or may calculate the deterioration levels of multiple battery modules according to input information that instructs the calculation of the deterioration levels and compare the calculation results with the rearrangement execution threshold.

[0020] In addition, a capacity maintenance rate or an internal resistance increase rate can be used as the deterioration degree of the storage battery module. In addition, the deterioration characteristic obtained in advance by a deterioration test using the storage battery module to be rearranged may be applied to the storage battery model including the deterioration characteristic.

[0021] The rearrangement combination calculation unit 54 calculates a rearrangement combination and order from the deterioration level of each storage battery module obtained by the deterioration calculation unit 52. The rearrangement combination calculation unit 54 ranks the multiple storage battery modules in order of deterioration level, and sets the highest-ranked storage battery module and the lowest-ranked storage battery module as a rearrangement combination and further sets the rearrangement order as 1. Next, the rearrangement combination calculation unit 54 sets the second-highest-ranked storage battery module and the second-lowest-ranked storage battery module as a rearrangement combination and sets the rearrangement order as 2. Thereafter, the rearrangement combination calculation unit 54 sequentially calculates rearrangement orders corresponding to combinations of high-ranked storage battery modules and low-ranked storage battery modules, and outputs a rearrangement combination list.

[0022] FIG. 3 is a diagram illustrating an example of a rearrangement combination list output from the rearrangement combination calculation unit. 3, the rearrangement combination list includes the deterioration level (internal resistance increase rate) [%] of the storage battery module, the deterioration level rank, and the rearrangement order (rearrangement combination) associated with the identifiers (ID: 1 to k) of each of the k storage battery modules. In this example, for example, the storage battery module with identifier 1 has the highest deterioration level rank, and the storage battery module with identifier 3 has the lowest deterioration level rank, so the rearrangement order (rearrangement combination) is combination 1. The storage battery module with identifier 5, which has the second highest deterioration level rank, is combined with the storage battery module with identifier k-1, which has the second lowest deterioration level rank, so the rearrangement order is combination 2.

[0023] The rearrangement number calculation unit 56 calculates the rearrangement number that maximizes the life of the storage battery system, using the rearrangement combination list and the storage battery model output from the rearrangement combination calculation unit 54. The rearrangement number calculation unit 56 outputs a combination of storage battery modules to be rearranged from the rearrangement combination list, based on the calculated rearrangement number.

[0024] FIG. 4 is a diagram for explaining an example of the operation of the rearrangement target presentation device according to the first embodiment. First, the rearrangement number calculation unit 56 sets calculation conditions according to the rearrangement combination list obtained from the rearrangement combination calculation unit 54 (step S0A). That is, the rearrangement number calculation unit 56 sets the maximum value n_max of the variable n used in the calculation as the total number of combinations of a plurality of storage battery modules included in the rearrangement combination list, and sets combinations of identifiers of two storage battery modules corresponding to each of the rearrangement combinations 1 to n_max according to the order of rearrangement in the rearrangement combination list.

[0025] Next, rearrangement number calculation unit 56 sets n=1 (step S1A), and sets the storage battery system to be calculated to be the storage battery system in which the positions of the two storage battery modules whose rearrangement order is 1 are swapped (step S2A).

[0026] Next, the rearrangement number calculation unit 56 uses the storage battery model to calculate the life T of the storage battery system when the rearrangement of the two storage battery modules of the rearrangement combination in which the rearrangement order of the calculation target is n-th is swapped (step S3A). The life T of the storage battery system is, for example, a period from the time when the use of the storage battery system is started after the rearrangement of the two n-th storage battery modules to the time when the deterioration degree (capacity maintenance rate, internal resistance increase rate, etc.) of any of the multiple storage battery modules included in the storage battery system becomes a predetermined threshold. The rearrangement number calculation unit 56 acquires information such as the operating conditions (charge / discharge current, SOC range, temperature), battery capacity, number of series / parallel connections, and battery deterioration characteristics of the storage battery modules from the storage unit 30, and calculates the deterioration degree of the multiple storage battery modules after rearrangement using the battery model including the deterioration characteristics using the acquired information, and determines the time until any of the storage battery modules reaches a predetermined threshold as the life T.

[0027] The rearrangement number calculation unit 56 compares the lifetime T of the two storage battery modules whose rearrangement order is n with the maximum value Tmax of the lifetime T calculated so far (step S4A), and if the calculated lifetime T is greater than the maximum value Tmax (step S4A "Yes"), it sets the maximum value Tmax to the calculated value of the lifetime T (step S5A) and sets the variable i to n, which is the rearrangement order (step S6A). Note that the initial value of the maximum value Tmax of the lifetime T may be, for example, 0.

[0028] When the calculated life T is equal to or less than the maximum value Tmax (step S4A "No") and after the process of step S6A is completed, the rearrangement number calculation unit 56 determines whether the rearrangement order n is the maximum value n_max (step S7A).

[0029] If the rearrangement order n is not the maximum value n_max, n is incremented by 1 (step S8A), and the storage battery system in which the storage battery modules up to the n-th combination have been rearranged is set as the calculation target (step SA9). Rearrangement number calculation unit 56 repeatedly performs the above steps S3A to S9A until it is determined in step S7A that the rearrangement order n is the maximum value n_max.

[0030] When it is determined in step S7A that the rearrangement order n is the maximum value n_max, the rearrangement number calculation unit 56 sets the numerical value of the variable i as the number of rearrangement combinations, and outputs the combinations of storage battery modules with rearrangement orders from 1 to i as the rearrangement combination conditions that maximize the life of the storage battery system (step S10A).

[0031] 5A to 5C are diagrams for explaining an example of the effects of the storage battery rearrangement target presentation device and storage battery rearrangement target presentation method according to the first embodiment. Here, an example will be described in which the rearrangement target presentation device and rearrangement target presentation method of the present embodiment are applied to a storage battery system in which 22 series storage battery modules are connected in two parallel connections. In this example, the internal resistance rise rate of the storage battery module is used as the deterioration degree of the storage battery module, and Figs. 5A-5C show the transition of the internal resistance rise rate only for some representative storage battery modules (including, for example, the storage battery module in which the maximum temperature was recorded, the storage battery module in which the average temperature was recorded, and the storage battery module in which the minimum temperature was recorded) among the multiple storage battery modules included in the storage battery system.

[0032] 5A shows an example of the transition of the internal resistance rise rate of a plurality of storage battery modules in a storage battery system in which the positions of two storage battery modules whose rearrangement order is 1 are swapped. That is, the value of the lifetime shown in FIG. 5A is the lifetime T calculated when n=1 in the procedure shown in FIG.

[0033] 5B shows an example of the transition of the internal resistance increase rate of a plurality of storage battery modules in a storage battery system in which the arrangement positions of 24 storage battery modules, whose rearrangement orders are 1 to 12, are swapped with their corresponding ones. That is, the value of the life shown in FIG. 5B is the life T calculated when n=12 in the procedure shown in FIG.

[0034] Fig. 5C shows an example of a transition of the internal resistance rise rate of a plurality of storage battery modules in a storage battery system in which the arrangement positions of 44 storage battery modules, whose rearrangement orders are 1 to 22, are swapped with their corresponding ones. In other words, Fig. 5C shows a transition of the internal resistance rise rate of a plurality of storage battery modules when the arrangement positions of all storage battery modules included in the storage battery system are swapped with their corresponding ones. That is, the value of the lifetime shown in Fig. 5C is the lifetime T calculated when n=22 in the procedure shown in Fig. 4.

[0035] Comparing the lifetimes shown in Figures 5A to 5C, the lifetime shown in Figure 5B is the longest. This result shows that the lifetime of the storage battery system will not be extended by increasing the number of storage battery modules by swapping their positions, and that the combination of storage battery modules to be swapped should be appropriately selected.

[0036] When the storage battery rearrangement target presentation device of this embodiment is applied to this storage battery system, the variable i becomes 12 and combinations of storage battery modules with rearrangement orders of 1 to 12 are output according to the procedure shown in Fig. 4 above. Therefore, according to this embodiment, it is possible to provide a storage battery rearrangement target presentation device, a storage battery rearrangement target presentation method, and a computer program that appropriately present rearrangement targets for extending the life of a storage battery system including a plurality of storage battery modules.

[0037] Next, a storage battery rearrangement target presentation method and a computer program according to a second embodiment will be described in detail with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. The storage battery rearrangement target presentation device of this embodiment differs from the first embodiment in the operation of the rearrangement number calculation unit 56 of the calculation unit 50.

[0038] In this embodiment, the storage battery rearrangement target presentation device presents the minimum combination of storage battery modules to be rearranged to achieve the target lifespan set by the user. That is, the rearrangement number calculation unit 56 calculates the minimum number of rearrangements that achieves the target lifespan of the storage battery system, using the rearrangement combination list, the storage battery model, and the target lifespan output from the rearrangement combination calculation unit 54. The rearrangement number calculation unit 56 outputs a combination of storage battery modules to be rearranged from the rearrangement combination list based on the calculated minimum number of rearrangements.

[0039] FIG. 6 is a diagram for explaining an example of the operation of the rearrangement target presentation device according to the second embodiment. First, the rearrangement number calculation unit 56 sets calculation conditions according to the rearrangement combination list obtained from the rearrangement combination calculation unit 54 (step S0B). That is, the rearrangement number calculation unit 56 sets the maximum value n_max of the variable n used in the calculation as the total number of combinations of a plurality of storage battery modules included in the rearrangement combination list, and sets combinations of identifiers of two storage battery modules corresponding to each of the rearrangement combinations 1 to n_max according to the order of rearrangement in the rearrangement combination list.

[0040] Next, the rearrangement number calculation unit 56 sets n=1 (step S1B), and sets the rearrangement combination to be calculated to be two storage battery modules whose rearrangement order is 1 (step S2B). Next, the rearrangement number calculation unit 56 uses the storage battery model to calculate the life T of the storage battery system when the rearrangement of the two storage battery modules of the rearrangement combination that is the nth rearrangement target is swapped (step S3B). The life T of the storage battery system is, for example, a period from the time when the use of the storage battery system is started after the rearrangement of the nth two storage battery modules to the time when the deterioration degree (capacity maintenance rate, internal resistance increase rate, etc.) of any of the multiple storage battery modules included in the storage battery system becomes a predetermined threshold. The rearrangement number calculation unit 56 acquires information such as the operating conditions (charge / discharge current, SOC range, temperature), battery capacity, number of series / parallel connections, and battery deterioration characteristics of the storage battery modules from the storage unit 30, and calculates the deterioration degree of the multiple storage battery modules after rearrangement using the battery model including the deterioration characteristics using the acquired information, and determines the time until any of the storage battery modules reaches a predetermined threshold as the life T.

[0041] The rearrangement number calculation unit 56 compares the life T of the two storage battery modules whose rearrangement order is n with the target life set by the user (step S4B), and if the calculated life T is less than or equal to the target life (step S4B "No"), after adding 1 to n (step S5B), sets the storage battery system in which up to the nth combination of storage battery modules have been rearranged as the calculation target (step S6B). The rearrangement number calculation unit 56 repeatedly performs the above steps S3B to S6B until it is determined that the life T calculated in step S4B is greater than the target life.

[0042] The lifespan T of the two storage battery modules whose rearrangement order is n is compared with the target lifespan set by the user (step S4B). If the calculated lifespan T is greater than the target lifespan (step S4B "Yes"), the rearrangement number calculation unit 56 outputs the numerical value of the variable n as the number of rearrangement combinations, and combinations of storage battery modules whose rearrangement orders are 1 to n, as the minimum rearrangement combination conditions for the lifespan of the storage battery system to achieve the target lifespan (step S7B).

[0043] As described above, the storage battery relocation target presentation device of the present embodiment can present a minimum combination of storage battery modules required for the storage battery system to satisfy a target lifespan by using a storage battery model including deterioration characteristics. Therefore, the present embodiment can provide a storage battery relocation target presentation device, a storage battery relocation target presentation method, and a computer program that appropriately present relocation targets for extending the lifespan of a storage battery system including a plurality of storage battery modules.

[0044] The program according to the present embodiment may be transferred in a state where it is stored in an electronic device, or in a state where it is not stored in an electronic device. In the latter case, the program may be transferred via a network, or in a state where it is stored in a storage medium. The storage medium is a non-transitory tangible medium. The storage medium is a computer-readable medium. The storage medium may be in any form, such as a CD-ROM or a memory card, as long as it is capable of storing a program and is computer-readable.

[0045] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0046] 10...input section, 20...output section, 30...storage section, 40...communication section, 50...calculation section, 52...deterioration calculation section, 54...relocation combination calculation section, 56...relocation number calculation section, 100...relocation target presentation device.

Claims

1. a deterioration calculation unit that calculates a deterioration level of each of the plurality of storage batteries by using a storage battery model including deterioration characteristics of the plurality of storage batteries; a rearrangement combination calculation unit that outputs an order of rearrangement of the storage batteries, the rearrangement order corresponding to a combination of the storage batteries to be rearranged, based on the deterioration levels of the storage batteries; and a rearrangement number calculation unit that outputs the combination of storage batteries to be rearranged based on the lifespan, which is the time until the deterioration level of any of the storage batteries exceeds a threshold value when using multiple storage batteries under specified conditions, when the placement positions of the corresponding storage batteries are sequentially rearranged according to the order.

2. The battery relocation target presentation device of claim 1, wherein the rearrangement number calculation unit calculates the lifespan of each of the storage batteries in the corresponding combinations when their positions are swapped in sequence according to the order, and outputs the combination of storage batteries that results in the longest lifespan.

3. The battery relocation target presentation device of claim 1, wherein the rearrangement number calculation unit calculates the lifespan when the arrangement positions of the storage batteries in the corresponding combinations are swapped in sequence according to the order, and outputs the combination of the storage batteries whose lifespan achieves a target lifespan.

4. The battery relocation target presentation device of claim 1, wherein the rearrangement combination calculation unit ranks the multiple storage batteries in order of the degree of deterioration, and the storage battery with the highest rank and the storage battery with the lowest rank are selected as the combination in which their placement positions are swapped, and the combination including the storage battery with the higher rank is selected as the earlier in the order.

5. The storage battery reallocation target presentation device according to claim 1 , wherein the deterioration level of the storage battery is a value using at least one of a capacity maintenance rate and an internal resistance increase rate of the storage battery.

6. Calculating a deterioration level of each of the plurality of storage batteries using a storage battery model including deterioration characteristics of the plurality of storage batteries; outputting an order of replacing the storage batteries, the order corresponding to a combination of the storage batteries to be replaced based on the deterioration levels of the storage batteries; A method for presenting storage batteries as candidates for relocation, which outputs the combination of storage batteries to be relocated based on the lifespan, which is the time until the deterioration level of any of the storage batteries exceeds a threshold value, using multiple storage batteries under specified conditions when the placement positions of the corresponding storage batteries are sequentially swapped according to the order.

7. A computer program product causing a computer to carry out the method according to claim 6.

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