Battery replacement method

Abstract

To provide a battery replacement method that suitably determines the replacement frequency of batteries mounted in a stationary power source in which the amount of work required to replace the mounted batteries varies depending on the mounting position. [Solution] A battery replacement method is carried out by a computer in a battery mounting housing having multiple mounting spaces stacked alternately on the front and back sides, each of which mounts a battery and has a battery removal port on the front.The battery mounting housing has a status acquisition procedure for acquiring the estimated deterioration state of at least one of the multiple mounted batteries, and a decision procedure for deciding to replace or rearrange the battery based on the estimated deterioration state and the mounted position of the battery.

Description

[Technical Field]

[0001] The present invention relates to a battery replacement method. [Background technology]

[0002] One possible use for reusing automotive batteries is in stationary power sources. When reusing automotive batteries to create a stationary power source with high power capacity, the housing of the stationary power source needs to house multiple automotive batteries at a high density. However, as the density of automotive batteries increases, the amount of space available within the housing of the stationary power source decreases. This increases the restrictions on the replacement of onboard batteries and the amount of work required for each replacement. Therefore, it is necessary to minimize the frequency of onboard battery replacement work and reduce the amount of work required to manage the stationary power source.

[0003] Patent document 1 discloses a method for replacing secondary batteries that make up a battery pack, in which defects of secondary batteries are determined on a voltage detection block basis, and batteries determined to be defective for replacement are replaced with replacement batteries on a voltage detection block basis. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-015781 Summary of the Invention [Problem to be solved by the invention]

[0005] The secondary battery replacement method disclosed in Patent Document 1 can reduce the cost of battery replacement in an assembled battery in which multiple secondary batteries are electrically connected in series or parallel, without detecting the voltages of all of the secondary batteries that make up the assembled battery. However, there is no mention of appropriately determining the replacement frequency based on the installation position of the secondary batteries that make up the assembled battery. Therefore, the secondary battery replacement method described in Patent Document 1 cannot appropriately determine the replacement frequency of the installed batteries in the case of a stationary power source in which the amount of work required to replace the installed batteries varies depending on their installation position, and therefore cannot reduce the amount of work required to replace the installed batteries.

[0006] In view of the above-mentioned problems, the object of the present disclosure is to provide a battery replacement method that suitably determines the replacement frequency of batteries installed in a stationary power source in which the amount of work required to replace the installed batteries varies depending on the installation position. [Means for solving the problem]

[0007] In one aspect of the present disclosure, a battery replacement method includes a computer executing a status acquisition procedure and a determination procedure in a battery mounting housing. The battery mounting housing has multiple mounting spaces alternately stacked on its front and back sides, each mounting space housing a battery and having a battery removal port on its front. The status acquisition procedure acquires estimated degradation states of the multiple mounted batteries. The determination procedure determines whether to replace or rearrange the batteries based on the estimated degradation states and the mounting positions of the batteries.

[0008] In the above battery replacement method, the decision step may include determining to replace the battery mounted on the front side that has reached the first criterion when the estimated deterioration state of the battery mounted on the front side reaches a first criterion. At this time, determining to replace the battery mounted on the rear side that has reached the second criterion when the estimated deterioration state of the battery mounted on the rear side reaches a second criterion. At this time, the second criterion is lower than the first criterion.

[0009] In the battery replacement method, the determination step may include determining, when the estimated deterioration state of the battery mounted on the rear side reaches a third criterion, to relocate the battery mounted on the rear side that has reached the third criterion to the front side, where the third criterion is lower than the second criterion.

[0010] In the above battery replacement method, in the decision procedure, when it is decided to replace at least one battery among the plurality of batteries, if the estimated deterioration state of the other batteries has reached a fourth judgment criterion, it may be decided to replace the battery that has reached the fourth judgment criterion.

[0011] In the above-described battery replacement method, the battery is an in-vehicle battery and has an interference part, and the interference part may interfere with the battery mounted on the front side or the battery mounting housing when the battery mounted on the rear side is removed from the removal port of the battery mounting housing. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to provide a battery replacement method that suitably determines the replacement frequency of batteries installed in a stationary power source in which the amount of work required to replace batteries varies depending on the installation position. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a configuration diagram of a stationary power supply 1 according to a first embodiment. [Figure 2] 4 is a first flowchart of a battery replacement method for the battery 11 according to the first embodiment. [Figure 3] 10 is a second flowchart of the battery replacement method for the battery 11 according to the second embodiment. [Figure 4] 11 is a third flowchart of the battery replacement method for the battery 11 according to the third embodiment. [Figure 5] 13 is a fourth flowchart of the battery replacement method for the battery 11 according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be described below through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential means for solving the problems. For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are assigned the same reference numerals, and duplicate explanations are omitted as necessary.

[0015] <First Embodiment> A first embodiment according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a configuration diagram of a stationary power supply 1 according to the first embodiment. The stationary power supply 1 has a battery-mounted housing 10 equipped with a plurality of batteries 11, and functions as a power supply. The stationary power supply 1 is used, for example, as a regulator for unstable power supply or as a backup emergency power supply. The stationary power supply 1 mainly includes the battery-mounted housing 10, the batteries 11, a temperature control unit 20, and a computer (not shown).

[0016] The battery mounting housing 10 is a housing for mounting a battery 11. The battery mounting housing 10 has multiple mounting spaces for mounting batteries. Each of the multiple mounting spaces mounts a battery 11. The battery mounting housing 10 also has an outlet 101 for the battery 11 on its front side. The mounting spaces are formed by alternately stacking the battery 11 on the front side closer to the outlet 101 and on the rear side farther from the outlet 101. Therefore, the battery 11 can be removed by moving it in the direction of the outlet 101 on the front side, as shown by the white arrow in Figure 1. Note that due to site area restrictions, etc., it is not possible to install the outlet 101 on the rear side of the battery mounting housing 10.

[0017] The battery mounting housing 10 has multiple mounting spaces. In FIG. 1, the battery mounting housing 10 has five mounting spaces on the front side and four mounting spaces on the back side. Here, the lowest mounting space is formed on the front side, and above that, mounting spaces are formed by alternately stacking the rear and front sides. In FIG. 1, there are nine mounting spaces, and the topmost one is formed on the front side.

[0018] A plurality of batteries 11 are mounted in the stationary power source 1 and used as a power source. The batteries 11 are, for example, vehicle batteries. Here, the vehicle batteries may be recycled batteries. The batteries 11 include a front-side battery 12 and a rear-side battery 13. The front-side battery 12 is mounted in a mounting space on the front side of the battery mounting housing 10. The rear-side battery 13 is mounted in a mounting space on the rear side of the battery mounting housing 10. The front-side battery 12 and the rear-side battery 13 are batteries of the same type. The front-side battery 12 and the rear-side battery 13 may be batteries of different types.

[0019] The battery 11 has an interference part 111. When the rear-side battery 13 is removed from the removal opening 101 of the battery-mounted housing 10, the interference part 111 interferes with the front-side battery 12 or the battery-mounted housing 10. Therefore, when removing the rear-side battery 13, it is necessary to first remove the vertically adjacent front-side battery 12.

[0020] The interference portion 111 is, for example, a portion where the thickness increases at the end of the battery 11, as shown in FIG. 1 . To improve the mounting density of the batteries 11, the battery mounting casing 10 stacks the mounting space so that the interference portion 111 is out of the overlapping portion of the batteries 11. Therefore, within the battery mounting casing 10, the batteries 11 are mounted so that the interference portion 111 of the front-side battery 12 and the back-side battery 13 protrudes from the overlapping portion to the front and back sides. Furthermore, most of the front-side battery 12 overlaps most of the back-side battery 13. This allows the installation area of ​​the battery mounting casing 10 to be reduced even when a large number of batteries 11 are mounted therein.

[0021] In this case, to improve the mounting density, the vertical separation distance between the overlapping batteries 11 is shorter than the thickness increase of the interference portion 111. Therefore, when removing the rear-side battery 13 through the removal opening 101, it interferes with the vertically adjacent front-side battery 12. Specifically, the rear-side battery 13 interferes with the interference portion 111 of the front-side battery 12 adjacent below it. Furthermore, the interference portion 111 of the rear-side battery 13 interferes with the vertically adjacent front-side battery 12. Therefore, when removing the rear-side battery 13, it is necessary to remove the vertically adjacent front-side battery 12 first.

[0022] Even if the batteries 11 do not have interfering portions 111, it is difficult to remove the rear-side battery 13 without removing the front-side battery 12 in a battery-mounted housing 10 with a high packing density. Similarly, even if the height separation distance between overlapping batteries 11 is longer than the thickness increase caused by the interfering portions 111, it is difficult to remove the rear-side battery 13 without removing the front-side battery 12 in a battery-mounted housing 10 with a high packing density. To reduce the possibility of damage due to interference, it is necessary to first remove the vertically adjacent front-side battery 12 before removing the rear-side battery 13.

[0023] As explained above, when replacing the rear battery 13, the front battery 12 adjacent above and below must also be removed, and the amount of work required to replace the rear battery 13 is greater than replacing the front battery 12. Therefore, it is particularly necessary to reduce the frequency of replacement of the rear battery 13.

[0024] The stationary power source 1 may measure information such as input / output or temperature of the battery 11 to obtain an estimated deterioration state of the battery 11. For example, the stationary power source 1 measures at least one of the input voltage, input current, output voltage, and output current of the battery 11 using an ammeter or voltmeter. Also, the stationary power source 1 may obtain temperature information by installing a temperature sensor in the battery 11, for example.

[0025] The temperature control unit 20 controls the temperature of the stationary power source 1. More specifically, the temperature control unit 20 suppresses a rise in the temperature of the battery 11. Furthermore, when the temperature of the battery 11 is low, the temperature control unit 20 heats it. The temperature control unit 20 is also called a temperature adjustment unit.

[0026] A computer (not shown) controls the input and output of the stationary power source 1. The computer may acquire an estimated degradation state of at least one of the multiple batteries 11 mounted in the stationary power source 1. The computer may also output at least one piece of information relating to the input and output states of the stationary power source 1 and the mounted batteries 11.

[0027] 2 is a first flowchart of the battery replacement method for the battery 11 according to the embodiment 1. The first flow includes steps S11 and S12.

[0028] Step S11 is a state acquisition procedure. In step S11, the computer acquires an estimated degradation state of at least one of the multiple batteries 11 installed in the stationary power source 1. The estimated degradation state is acquired from measurement results such as input / output information or temperature information related to the battery 11.

[0029] Step S12 is a decision procedure. In step S12, the computer determines whether to replace or rearrange the battery 11 based on the estimated deterioration state and the mounting position of the battery 11.

[0030] The end of step S12 marks the end of the first flow of the battery replacement method for the stationary power supply 1. After the end of the first flow, the stationary power supply 1 may output the information determined in the determination procedure of step S12. This allows the stationary power supply 1 of this embodiment to suitably determine the replacement frequency of the battery 11 based on the estimated deterioration state of the battery 11 installed therein.

[0031] The stationary power supply 1 may include a processor and a storage device, which are not shown in the figure. The storage device of the stationary power supply 1 includes a storage device including a nonvolatile memory such as a flash memory or an SSD (Solid State Drive). In this case, the storage device stores a computer program (hereinafter simply referred to as a program) for executing the above-described method. The processor loads the computer program from the storage device into a buffer memory such as a DRAM (Dynamic Random Access Memory) and executes the program.

[0032] Furthermore, the stationary power source 1 may be connected to a network and execute the program by distributed processing such as so-called cloud computing.

[0033] <Embodiment 2> 3 is a second flowchart of the battery replacement method for the battery 11 according to the second embodiment. The second flow determines the battery 11 to be replaced. Here, the second flow is applied to the stationary power source 1 in FIG. 1. Therefore, a description of the configuration of the stationary power source 1 described with reference to FIG. 1 will be omitted.

[0034] The second flow includes steps S21 to S28. Step S21 corresponds to the state acquisition procedure of step S11 described with reference to Fig. 2. Steps S22 to S28 correspond to the determination procedure of step S12 described with reference to Fig. 2.

[0035] In step S21, the computer calculates at least one of the capacity maintenance rate and the most recent capacity change rate of each battery. The capacity maintenance rate is the ratio of the current battery capacity of the battery 11 to the battery capacity specified for the battery 11. The capacity maintenance rate may also be the ratio of the current battery capacity of the battery 11 to the battery capacity immediately after the battery 11 is replaced. The capacity change rate is the amount of change over time in the capacity maintenance rate of the battery 11. The computer treats at least one of the calculated capacity maintenance rate and the most recent capacity change rate as an estimated degradation state. The computer may calculate an estimated replacement time for each battery 11 from at least one of the capacity maintenance rate and the most recent capacity change rate, and treat the estimated replacement time as an estimated degradation state.

[0036] Step S21 is started at every predetermined period. The predetermined period may be, for example, one day, one week, one month, etc. Step S21 may also be started when a replacement battery 11 that is not yet installed is available.

[0037] In step S22, the computer determines whether the target battery 11 is mounted on the front side. The computer obtains the mounting position of the target battery 11. If the mounting position of the battery 11 is on the front side, the computer starts step S23. If not, the computer starts step S26. In other words, the computer performs the process starting from step S23 on the front-side battery 12, and the process starting from step S26 on the rear-side battery 13.

[0038] Step S23 is started when it is determined that the battery 11 is arranged on the front side. In step S23, the computer determines whether the estimated deterioration state of the front-side battery 12 has reached a first determination criterion 31. The first determination criterion 31 is a predetermined threshold based on past data regarding battery replacement. The first determination criterion 31 may be determined based on the state of the stationary power source 1 and each component included in the stationary power source 1. If the estimated deterioration state of the front-side battery 12 has reached the first determination criterion 31, the computer starts step S24. If not, the computer starts step S25.

[0039] In step S24, the computer determines that the front battery 12 should be replaced and outputs a replacement signal for the front battery 12. The computer may output a predetermined notification to a connected external device as the replacement signal. The computer may be equipped with a buzzer and may output the replacement signal by sounding the buzzer in a predetermined manner. The computer may be equipped with a notification light and may output the replacement signal by turning on the notification light in a predetermined manner. In step S25, the computer ends the series of processes without outputting a replacement signal. Upon completion of step S24 or step S25, the computer ends the second flow.

[0040] Here, the first criterion 31 is, for example, that the current capacity maintenance rate of the front-side battery 12 is below 60% of the specified battery capacity. This allows the stationary power source 1 to decide to replace the front-side battery 12 whose capacity maintenance rate has decreased. The first criterion 31 is, for example, that the most recent capacity change rate of the front-side battery 12 is 10% or more. This allows the stationary power source 1 to decide to replace the front-side battery 12 whose deterioration has progressed rapidly.

[0041] Furthermore, the first criterion 31 is, for example, that the estimated replacement time for the front-side battery 12 is within one month from now. This allows the stationary power source 1 to determine whether to replace the front-side battery 12 that needs to be replaced by the next inspection cycle.

[0042] Step S26 is initiated when it is determined that the battery 11 is arranged on the rear side. In step S26, the computer determines whether the estimated deterioration state of the rear-side battery 13 has reached a second judgment criterion 32. The second judgment criterion 32 is a predetermined threshold based on past data regarding battery replacement. The second judgment criterion 32 may be determined based on the state of the stationary power source 1 and each component included in the stationary power source 1. If the estimated deterioration state of the rear-side battery 13 has reached the second judgment criterion 32, the computer initiates step S27. Otherwise, the computer initiates step S28. Note that the second judgment criterion 32 is a lower criterion than the first judgment criterion 31.

[0043] In step S27, the computer decides to replace the rear-side battery 13 and outputs a replacement signal for the rear-side battery 13. The computer may send a predetermined notification to a connected external device as the replacement signal output. The computer may be equipped with a buzzer and may sound the buzzer in a predetermined manner as the replacement signal output. The computer may be equipped with a notification light and may turn on the notification light in a predetermined manner as the replacement signal output. In step S28, the computer ends the series of processes without outputting a replacement signal. Upon completion of step S27 or step S28, the computer ends the second flow.

[0044] Here, the second criterion 32 is, for example, that the current capacity maintenance rate of the rear-side battery 13 is below 70% of the specified battery capacity. This allows the stationary power supply 1 to decide to replace the rear-side battery 13 whose capacity maintenance rate is declining, and to set an earlier replacement time than for the front-side battery 12. The second criterion 32 is, for example, that the most recent capacity change rate of the rear-side battery 13 is 8% or more. This allows the stationary power supply 1 to manage the deteriorated rear-side battery 13 more carefully than the front-side battery 12.

[0045] Further, the second criterion 32 is, for example, that the estimated replacement time of the backside battery 13 is within two months from now. This allows the stationary power source 1 to decide to replace the backside battery 13 with ample time to spare.

[0046] As described above, the second flow of the battery replacement method including steps S21 to S28 allows the stationary power source 1 of this embodiment to determine whether to replace the batteries 11 using replacement criteria that correspond to the mounting position of each battery 11. This allows the stationary power source 1 to suitably determine the replacement frequency based on the estimated deterioration state of the mounted batteries 11.

[0047] <Third Embodiment> 4 is a third flowchart of the battery replacement method for the battery 11 according to the third embodiment. The third flow determines the battery 11 to be replaced or rearranged. Here, the third flow is applied to the stationary power source 1 in FIG. 1. Therefore, a description of the configuration of the stationary power source 1 described with reference to FIG. 1 will be omitted.

[0048] The third flow includes steps S301 to S310. Step S301 corresponds to the status acquisition procedure of step S11 described with reference to Fig. 2. Steps S302 to S310 correspond to the determination procedure of step S12 described with reference to Fig. 2. Steps S301 to S305 correspond to steps S21 to S25 in the second flow of the battery replacement method described with reference to Fig. 3. Therefore, a description of steps S301 to S305 will be omitted.

[0049] Step S306 is initiated when it is determined that the battery 11 is arranged on the rear side. In step S306, the computer determines whether the estimated deterioration state of the rear-side battery 13 has reached a third criterion 33. The third criterion 33 is a predetermined threshold based on past data regarding battery replacement. The third criterion 33 may be determined based on the state of the stationary power source 1 and each component included in the stationary power source 1. If the estimated deterioration state of the rear-side battery 13 has reached the third criterion 33, the computer initiates step S307. Otherwise, the computer initiates step S310. Note that the third criterion 33 is lower than the first criterion 31.

[0050] In step S307, the computer determines whether the estimated degradation state of the rear-side battery 13 has reached the second judgment criterion 32. The second judgment criterion 32 is a predetermined threshold based on past data regarding battery replacement. The second judgment criterion 32 may be determined based on the state of the stationary power source 1 and each component included in the stationary power source 1. If the estimated degradation state of the rear-side battery 13 has reached the second judgment criterion 32, the computer starts step S308. If not, the computer starts step S309. Note that the second judgment criterion 32 is lower than the first judgment criterion 31. Furthermore, the third judgment criterion 33 is lower than the second judgment criterion 32.

[0051] In other words, the computer executes the process of step S308 for the rear-side battery 13 that meets the second judgment condition 32, and executes the process of step S309 for the rear-side battery 13 that does not meet the second judgment condition 32 but meets only the third judgment condition 33.

[0052] In step S308, the computer determines to replace the rear-side battery 13 that has met the second judgment condition 32 and outputs a replacement signal for that rear-side battery 13. In step S309, the computer determines to relocate the rear-side battery 13 that has met the third judgment condition 33 to the front-side mounting space and outputs a relocation signal for that rear-side battery 13. The computer may send a predetermined notification to a connected external device as the output of the replacement or relocation signal. The computer may include a buzzer and sound the buzzer in a predetermined manner as the output of the replacement or relocation signal. The computer may include a notification light and turn on the notification light in a predetermined manner as the output of the replacement or relocation signal. Completion of step S308 or step S309 causes the computer to end the third flow.

[0053] Here, the third criterion 33 is, for example, that the current capacity maintenance rate of the rear-side battery 13 is below 75% of the specified battery capacity. This allows the stationary power source 1 to decide to rearrange the rear-side battery 13 whose capacity maintenance rate has begun to decline, and to arrange the battery 11 approaching the time for replacement on the front side where it is easier to remove. The third criterion 33 is, for example, that the most recent capacity change rate of the rear-side battery 13 is 5% or more. This allows the stationary power source 1 to arrange the rear-side battery 13, which is prone to deterioration, on the front side.

[0054] Furthermore, the third criterion 33 is, for example, that the estimated replacement time for the rear-side battery 13 is within two and a half months from now. According to this, the stationary power source 1 can place the rear-side battery 13 that is nearing the time for replacement on the front side.

[0055] In step S310, the computer ends the series of processes without outputting a replacement signal or a rearrangement signal. Upon completion of step S310, the computer ends the third flow.

[0056] As described above, the third flow of the battery replacement method including steps S301 to S310 allows the stationary power source 1 of this embodiment to set criteria for replacement and rearrangement according to the mounting position of each battery 11. This allows the stationary power source 1 to suitably determine the replacement frequency based on the estimated state of deterioration of the mounted batteries 11. Furthermore, the stationary power source 1 can suitably determine the placement of the mounted batteries 11 based on the estimated state of deterioration of the mounted batteries 11.

[0057] <Fourth Embodiment> 5 is a fourth flowchart of the battery replacement method for batteries 11 according to the fourth embodiment. The fourth flow determines the batteries 11 to be replaced together when replacement is performed. Here, the fourth flow is applied to the stationary power source 1 in FIG.

[0058] The fourth flow includes steps S41 to S45. Step S41 corresponds to the state acquisition procedure of step S11 described with reference to Fig. 2. Steps S42 to S45 correspond to the determination procedure of step S12 described with reference to Fig. 2.

[0059] In step S41, the computer calculates at least one of the capacity maintenance rate and the most recent capacity change rate of each battery. The capacity maintenance rate is the ratio of the current battery capacity of the battery 11 to the battery capacity specified for the battery 11. The capacity maintenance rate may also be the ratio of the current battery capacity of the battery 11 to the battery capacity of the battery 11 immediately after replacement of the battery 11. The capacity change rate is the amount of change over time in the capacity maintenance rate of the battery 11. The computer treats at least one of the calculated capacity maintenance rate and the most recent capacity change rate as an estimated degradation state. The computer may calculate an estimated replacement time for each battery 11 from at least one of the capacity maintenance rate and the most recent capacity change rate, and treat the estimated replacement time as an estimated degradation state.

[0060] In step S42, the computer determines to replace at least one battery 11 among the plurality of batteries 11. When it determines to replace at least one battery 11 among the plurality of batteries 11, the computer starts step S43.

[0061] Step S43 is initiated when the computer determines to replace at least one battery 11 among the multiple batteries 11. In step S43, the computer determines whether the estimated degradation states of the batteries 11 other than the battery 11 determined to be replaced have reached a fourth determination criterion 34. The fourth determination criterion 34 is a predetermined threshold based on past data related to battery replacement. The fourth determination criterion 34 may be determined based on the state of the stationary power source 1 and each component included in the stationary power source 1. If the estimated degradation states of the batteries 11 other than the battery 11 determined to be replaced have reached the fourth determination criterion 34, the computer initiates step S44. If not, the computer initiates step S45. Note that the fourth determination criterion 34 may be lower than the determination criterion used in step S42.

[0062] In step S44, the computer determines to replace not only the batteries 11 that satisfy the first criterion 31 but also the batteries 11 that have reached the fourth criterion 34, and outputs a replacement signal for the batteries 11. In step S45, the computer outputs a replacement signal only for the batteries 11 that satisfy the first criterion 31. The computer may send a predetermined notification to a connected external device as the replacement signal output. The computer may be equipped with a buzzer and may sound the buzzer in a predetermined manner as the replacement signal output. The computer may be equipped with a notification light and may turn on the notification light in a predetermined manner as the replacement signal output. Upon completion of step S44 or step S45, the computer ends the fourth flow.

[0063] Here, the fourth criterion 34 is, for example, that the current capacity maintenance rate of the battery 11 is below 70% of the specified battery capacity. The fourth criterion 34 is, for example, that the most recent capacity change rate of the battery 11 is 8% or more. Furthermore, the fourth criterion 34 is, for example, that the estimated replacement time of the battery 11 is within two months from now. This allows the stationary power source 1 to collectively determine the replacement of batteries 11 that are estimated to require replacement in the near future. Therefore, the stationary power source 1 can reduce the frequency of battery 11 replacement.

[0064] As described above, the fourth flow of the battery replacement method including steps S41 to S45 allows the stationary power supply 1 of this embodiment to determine batteries 11 that should be replaced collectively based on the estimated deterioration state. This allows the stationary power supply 1 to collectively replace batteries 11 that are estimated to require replacement in the near future, thereby reducing the replacement frequency.

[0065] The present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the present invention. For example, the fourth criterion 34 for the front-side battery 12 and the fourth criterion 34 for the back-side battery 13 may be set as different criteria. Also, the criteria for batteries 11 surrounding a battery 11 that satisfies the first criterion 31 may be lowered to determine replacement. [Explanation of symbols]

[0066] 1 Stationary power source 10 Battery housing 101 Outlet 11 Batteries 111 Interference part 12 Front battery 13 Rear battery 20 Temperature control unit 31 First judgment criterion 32 Second judgment criterion 33 Third criterion 34 Fourth Judgment Criteria

Claims

1. A plurality of mounting spaces are stacked alternately on the front side and the rear side, Each of the plurality of mounting spaces is equipped with a battery, In a battery mounting housing having a battery removal opening on the front surface, a state acquisition step of acquiring an estimated deterioration state of at least one of the plurality of batteries installed; a determination step of determining whether to replace or rearrange the battery based on the estimated deterioration state and the mounting position of the battery; The computer performs the battery replacement method.

2. In the determination procedure, When the estimated deterioration state of the battery mounted on the front side reaches a first determination criterion, determining to replace the battery mounted on the front side that has reached the first determination criterion; When the estimated deterioration state of the battery mounted on the rear side reaches a second determination criterion, determining to replace the battery mounted on the rear side that has reached the second determination criterion; the second criterion is lower than the first criterion; The battery replacement method according to claim 1 .

3. In the determination procedure, When the estimated deterioration state of the battery mounted on the rear side reaches a third determination criterion, determining to rearrange the battery mounted on the rear side that has reached the third determination criterion to the front side; the third criterion is lower than the second criterion; The battery replacement method according to claim 2.

4. In the determination procedure, When it is determined to replace at least one of the plurality of batteries, if the estimated deterioration states of the other batteries have reached a fourth determination criterion, it is determined to replace the battery that has reached the fourth determination criterion. The battery replacement method according to any one of claims 1 to 3.

5. The battery comprises: It is an in-vehicle battery, It has an interference part, the interference portion interferes with the battery mounted on the front side or the battery mounting housing when the battery mounted on the rear side is removed from the removal port of the battery mounting housing. The battery replacement method according to any one of claims 1 to 3.

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