Charging system

Abstract

A charging system is provided that charges a plurality of construction machines that are driven by electricity from a main power supply device and a sub-power supply device. [Solution] The construction equipment includes a main power supply unit (10) having a first secondary battery (11) that charges with external power and charges the power stored in the first secondary battery (11) to a third secondary battery (31) that is mounted on each of a plurality of construction machines (30) and supplies power as a drive power source for each of the construction machines, and a sub-power supply unit (20) having a second secondary battery (21) that charges with external power and is connected to the main power supply unit (10) and functions as an auxiliary power source for the first secondary battery (11). The construction equipment also includes a management device (50) that manages the usage of the first secondary battery (11), the second secondary battery (21), and the third secondary battery (31), and the management device (50) calculates a charging schedule for the first secondary battery (11), the second secondary battery (21), and the third secondary battery (31) based on information relating to the states of the first secondary battery (11), the second secondary battery (21), and the third secondary battery (31).

Description

[Technical Field]

[0001] The present invention relates to a charging system for charging a construction machine. [Background technology]

[0002] Patent Document 1 discloses a mobile power supply device that charges an electric hydraulic excavator from a secondary battery. This power supply device is a mobile power supply device that includes a plurality of secondary batteries, and includes a power receiving port that can be connected to a commercial power source via a power receiving cable, a charger connected to the power receiving port, a first switch that selectively connects or cuts off the secondary batteries to the charger in a one-to-one relationship, a power transmission port that can be connected to the electric hydraulic excavator via a power transmission cable, and a second switch that connects the secondary batteries to each other in series and selectively connects or cuts off the power to the power transmission port.

[0003] Patent Document 2 discloses a power supply device that connects to a spare battery, the power supply device comprising a chargeable and dischargeable main battery, an inverter that converts direct current into alternating current and supplies it to a load, a CPU that manages and controls the entire power supply device, a spare connection circuit for electrically connecting an external spare battery to the load, and a changeover switch that switches whether the load is connected to the main battery or the spare battery, and the spare connection circuit has two parallel wires, a first wire and a second wire, for connection to one spare battery, and a first connection port and a second connection port corresponding to each wire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-56957 [Patent Document 2] Japanese Patent Application Laid-Open No. 2024-39281 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology shown in Patent Document 1 describes that by switching circuits, when transmitting power from multiple secondary batteries provided in a power supply device to an electric hydraulic excavator, the multiple secondary batteries are connected in series to increase the transmission voltage, and when charging the multiple secondary batteries provided in the power supply device, the multiple secondary batteries are connected in parallel to shorten the charging time.However, there is a limit to the amount of power that can be charged at one time to the multiple secondary batteries provided in the power supply device.

[0006] Furthermore, the technology disclosed in Patent Document 2 efficiently supplies power by linking a main battery and a spare battery, but does not disclose power supply to construction machinery that uses a battery as a drive source.

[0007] The present invention has been made to solve the above-mentioned problems, and has an object to provide a charging system that charges construction machinery using a main power supply unit and a sub-power supply unit so as to ensure a sufficient amount of power to charge construction machinery that is driven by electricity. [Means for solving the problem]

[0008] The charging system of the present invention comprises a main power supply device having a first secondary battery that charges with external power and charges the power stored in the first secondary battery to a third secondary battery that is mounted on each of a plurality of construction machines and supplies power as a drive power source for each of the construction machines, and a sub-power supply device having a second secondary battery that charges with external power and is connected to the main power supply device and functions as an auxiliary power source for the first secondary battery.

[0009] In this way, the charging system of the present invention has a first secondary battery that charges with external power, and is equipped with a main power supply device that charges the power stored in the first secondary battery to a third secondary battery that is mounted on each of a plurality of construction machines and supplies power as a driving power source for each of the construction machines, thereby achieving the effect of allowing the third secondary battery of the construction machines to be sufficiently charged at the work site from the first secondary battery of the main power supply device and the second secondary battery of the sub-power supply device. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a system configuration of a charging system according to a first embodiment of the present invention. [Figure 2] 1 is a diagram showing a hardware configuration of a management device in a charging system according to a first embodiment of the present invention. [Figure 3] 2 is a functional block diagram of a computer of a management device in the charging system according to the first embodiment of the present invention. FIG. [Figure 4] 4 is a flowchart showing the operation of a management device in the charging system according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] (First embodiment of the present invention) The charging system according to this embodiment will be described with reference to Figures 1 to 4. The charging system according to this embodiment is a charging system that uses a portable power supply device that can charge, at a work site, multiple construction machines that are driven by power stored in secondary batteries. Figure 1 is a diagram showing the system configuration of the charging system according to this embodiment.

[0012] The charging system 1 comprises a main power supply unit 10 which serves as the main power supply unit and has a first secondary battery 11 which charges with external power such as a commercial power source; a sub-power supply unit 20 which serves as an auxiliary power source for the main power supply unit 10 and has a second secondary battery 21 which charges with external power such as a commercial power source; a rapid charger 40 which rapidly charges a third secondary battery 31 possessed by the construction machine 30 from the first secondary battery 11 of the main power supply unit 10 and / or the second secondary battery 21 of the sub-power supply unit 20; and a management device 50 which manages the operation of the main power supply unit 10, the sub-power supply unit 20, and the construction machine 30.

[0013] The main power supply unit 10 comprises a first charger 12 that charges the first secondary battery 11 with power from the commercial power source 100, a communication unit 13 for wireless communication with external devices, a first control unit 14 that manages and controls the first secondary battery 11 and various other processes performed by the main power supply unit 10, and an AC conversion unit 15 that performs voltage conversion to enable normal charging (charging using AC voltage, hereinafter referred to as normal charging) of the power stored in the first secondary battery 11 to the third secondary battery 31 of the construction machine 30.

[0014] The first secondary battery 11 of the main power supply 10 is charged from the commercial power supply 100 via a first charger 12. Management and control of the remaining battery capacity and charging / discharging of the first secondary battery 11 is performed by a first control unit 14, and information regarding the second secondary battery 21 of the sub-power supply 20 (described later) and the third secondary batteries 31 of multiple construction machines 30 can be obtained by the first control unit 14 via a communication unit 13. In other words, the first control unit 14 can collectively manage information such as the amount of power that can be supplied by the main power supply 10 and the sub-power supply 20 as a whole, and the remaining battery capacity of the third secondary battery 31 of each construction machine 30. In addition, by transmitting the information managed and controlled by the first control unit 14 via the communication unit 13 to a management device 50 (described later), management and control of the entire system can be performed using more detailed and sophisticated calculations.

[0015] Note that, at a site where it is relatively easy to transport the main power supply 10 or to connect to the commercial power supply 100 (for example, a site where the commercial power supply 100 is accessible and a road is in good condition), it is desirable to charge the first secondary battery 11 of the main power supply 10 from the commercial power supply 100 via the first charger 12. However, at a site where it is difficult to transport the main power supply 10 or to connect to the commercial power supply 100 (for example, a site deep in the mountains where there is no electrical equipment for the commercial power supply 100), a circuit configuration may be used that enables charging of the first secondary battery 11 from the sub-power supply 20, which will be described later. That is, when the main power supply 10 and the sub-power supply 20 are connected, a changeover switch (not shown) may be provided that switches between connecting the sub-power supply 20 to the first secondary battery 11 of the main power supply 10 or to the third secondary battery 31 of the construction machine 30 that is connected downstream of the main power supply 10, and the first control unit 14 may control the changeover of this changeover switch based on the remaining battery power of the first secondary battery 11. Specifically, when the remaining battery charge of the first secondary battery 11 is below a predetermined level, the sub-power supply unit 20 may be controlled to charge the first secondary battery 11, and when the remaining battery charge of the first secondary battery 11 is greater than the predetermined level, the sub-power supply unit 20 may be controlled to supply power to the construction machine 30.

[0016] The sub-power supply device 20 includes a second charger 22 that charges the second secondary battery 21 with power from the commercial power source 100, a communication unit 23 for wireless communication with an external device, and a second control unit 24 that manages and controls the second secondary battery 21.

[0017] The second secondary battery 21 of the sub-power supply device 20 is charged from the commercial power supply 100 via a second charger 22. The remaining battery capacity and charging / discharging of the second secondary battery 21 are managed and controlled by a second control unit 24, and various information about the second secondary battery 21 obtained here can be transmitted via a communication unit 23 to the control unit 14 of the main power supply device 10 and the management device 50.

[0018] The second secondary battery 21 can be connected to the first secondary battery 11 of the main power supply unit 10 by a cable 25, and the first secondary battery 11 and the second secondary battery 21 may be integrated into a large-capacity secondary battery that can supply power to the construction machine 30, or power may be selectively supplied to the construction machine 30 from either the first secondary battery 11 or the second secondary battery 21, or the first secondary battery 11 may be charged from the second secondary battery 21 as described above. In other words, in either case, the sub-power supply unit 20 functions as an auxiliary power source for the main power supply unit 10.

[0019] The rapid charging device 40 is equipped with a fourth control unit 44 that controls rapid charging (charging using DC voltage, hereinafter referred to as rapid charging) of the third secondary battery 31 of the construction machine 30 while communicating information with the construction machine 30 when it detects that the rapid charging device 40 and the construction machine 30 are electrically connected by a cable or the like, and a DC conversion unit 45 that converts the voltage of the first secondary battery 11 and / or the second secondary battery 21 in accordance with the control of the fourth control unit 44.

[0020] Specifically, the fourth control unit 44 acquires information about the third secondary battery 31 of the construction machine 30 from the third control unit 34 of the construction machine 30, which will be described later, via the cable communication line, and controls the DC conversion unit 45 to convert the battery voltage of the first secondary battery 11 and / or the second secondary battery 21 to an appropriate DC voltage value according to the state of the third secondary battery 31. Furthermore, as charging by rapid charging progresses, the state of the third secondary battery 31 changes (the amount of charge increases), so the DC voltage is also controlled according to this change. By performing such strict control at a high DC voltage, it is possible to charge more rapidly than with a normal voltage.

[0021] The construction machine 30 is an electrically powered construction machine 30 equipped with a third secondary battery 31 and using the third secondary battery 31 as a power source, and various types of construction machine 30 fall into this category, such as hydraulic excavators, wheel loaders, carrier dumps, flashers, and mobile cranes. The construction machine 30 is equipped with a third control unit 34 that manages and controls the third secondary battery 31, which is the power source, and a communication unit 33 for wireless communication with external devices. Battery information about the third secondary battery 31 managed by the third control unit 34 is transmitted to the main power supply device 10 and the management device 50, and information about the driving mode of the construction machine 30 (such as information about what operation was performed and for how long) is also transmitted.

[0022] The third secondary battery 31 of the construction machine 30 can be charged by rapid charging using the rapid charging device 40, and also by normal power supply via the AC conversion unit 15 of the main power supply device 10. Rapid charging using the rapid charging device 40 allows one construction machine 30 to be charged in one charge (for example, charging at 120 kW), while normal charging allows multiple construction machines 30 to be charged in one charge (for example, charging two construction machines 30 at 25 kW compared to 60 kW). In other words, in this example, up to three construction machines 30 can be charged simultaneously. Note that some construction machines 30 are compatible with rapid charging and some are not, and construction machines 30 that are not compatible with rapid charging can only be charged by normal charging.

[0023] The management device 50 acquires information on the first secondary battery 11, second secondary battery 21, and third secondary battery 31 provided in the main power supply unit 10, sub-power supply unit 20, and construction machine 30, respectively, and creates an appropriate schedule for charging and discharging each secondary battery. It also designs work based on information related to the work to be performed, and creates work design information.

[0024] 2 is a diagram showing the hardware configuration of a management device in the charging system according to this embodiment. The management device 50 includes a CPU 51, RAM 52, ROM 53, a hard disk (hereinafter referred to as HD) 54, a communication I / F 55, an operation panel 56, and a display 57, which are connected via a bus. The ROM 53 and HD 54 store an operating system and various programs, which are read into the RAM 52 as needed, and the CPU 51 executes each program.

[0025] The communication I / F 55 is an interface for communication between devices. The operation panel 56 accepts input from input devices such as a touch panel and a keyboard. The display 57 displays calculation results and the like. The management device 50 can be a personal computer, mobile computer, tablet, smartphone, etc., and in this embodiment, it is a device carried and used by a manager or operator of the charging system 1. Note that the above hardware configuration is merely an example and can be changed as needed.

[0026] Fig. 3 is a functional block diagram of a computer of a management device in a charging system according to this embodiment. In Fig. 3, the computer 60 of the management device 50 includes an information acquisition unit 61 that acquires battery-related information 64 and construction work-related information 65 transmitted from external devices (e.g., the main power supply unit 10, the sub-power supply unit 20, the construction machine 30, and other devices), a calculation unit 62 that generates work design information and charging schedule information based on the acquired information, and an output control unit 63 that outputs the calculation results of the calculation unit 62 to a display 57 or transmits them to external devices. The calculation unit 62 also includes a work design unit 62a that creates work design information by performing work design for the upcoming work, and a charging schedule unit 62b that calculates the charging order (charging schedule) of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31 during the work and creates charging schedule information.

[0027] As described above, the main power supply unit 10, the sub-power supply unit 20, and the construction machine 30 each include a first control unit 14, a second control unit 24, and a third control unit 34, as well as a first communication unit 13, a second communication unit 23, and a third communication unit 33. The information acquisition unit 61 receives information (e.g., charge / discharge information, information on usage status, etc.) related to the secondary batteries (first secondary battery 11, second secondary battery 21, third secondary battery 31) transmitted from each of these devices as battery-related information 64.

[0028] In addition, this information may be collected in the control unit 14 of the main power supply device 10 and then transmitted in bulk from the control unit 14 to the management device 50, or each piece of information may be stored in cloud storage in real time, and the information acquisition unit 61 may be able to acquire each piece of information by accessing the cloud storage.

[0029] The information acquisition unit 61 acquires work-related information 65 relating to work to be performed in addition to the battery-related information 64 relating to the secondary battery. The work-related information 65 specifically includes information such as the construction work period, work content, and work scale. The work-related information 65 may be manually input by a system administrator, may be received from another terminal device, or may be acquired by accessing cloud storage.

[0030] The work design unit 62a creates work design information based on the work-related information 65 acquired by the information acquisition unit 61. Specifically, the work design unit 62a estimates the total amount of power required from the start to the end of the construction work based on the work period, work content, and work scale. This total amount of power required may be estimated by, for example, registering operation estimation information for multiple model cases in advance, including the number of construction machines 30 required, operating hours, and loads for various work periods, work content, and work scales, and extracting operation estimation information from the model case with the most similar conditions. Furthermore, the operation estimation information for this extracted model case may be corrected using a predetermined calculation formula based on the work information 64 acquired by the information acquisition unit 61 (for example, extracting operation estimation information for two similar model cases and calculating the average value).

[0031] In addition to extracting a model case of operation estimation information registered in advance as described above, an AI that has learned such operation estimation information may be prepared, and the work-related information 65 acquired by the information acquisition unit 61 may be used as input information to generate operation estimation information corresponding to this.

[0032] When operation estimation information based on the work-related information 65 is obtained, the work design unit 62a estimates the total amount of electricity required for all work and calculates the number of main power supply units 10 and sub-power supply units 20 required to cover this total amount of electricity.

[0033] Generally, one work site will use one main power supply unit 10 and one or more accompanying sub-power supplies 20, but depending on the size and scale of the work site, it may be determined that multiple main power supply units 10 are necessary, and the required number of units will be calculated. For example, for main power supply units 10 that require a lot of effort to transport, the number of work bases is set depending on the size and topography of the work site, and the number of units is calculated so that a main power supply unit 10 can be placed at each base. Sub-power supply units 20 are relatively easy to transport, so the number is calculated so that the total amount of power obtained above can be covered while charging as needed (taking into account the number of times charging can be performed during the work period, etc.).

[0034] Furthermore, for these calculations, as in the case of the above-mentioned operation estimation information, the number of main power supply units 10 and sub-power supply units 20 for each model case may be registered in advance, and a model case that matches the current scale may be extracted to calculate the optimum number of main power supply units 10 and sub-power supply units 20, or information on the work site and the total amount of power may be used as input information to calculate the optimum number of main power supply units 10 and sub-power supply units 20 using AI.

[0035] Through this processing, work design information is created that includes operation estimation information including the number of construction machines 30, operating time, load, etc., as well as information on the number of main power supplies 10 and sub-power supplies 20 required to cover these.

[0036] The charging schedule unit 62b calculates the priority for charging the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31 while the construction machine 30 is actually performing work at the work site, and calculates and creates a charging schedule based on the priority in real time.

[0037] When creating charging schedule information, it is necessary to create a charging schedule that indicates the priority in which the first secondary battery 11 of the main power supply unit 10 and the second secondary battery of the sub-power supply unit 20 will be used to charge the third secondary batteries 31 of the multiple construction machines 30, and also to take into account the timing at which the first secondary battery 11 of the main power supply unit 10 and the second secondary battery of the sub-power supply unit 20 will be charged from the commercial power source.

[0038] Specifically, for example, for the third secondary batteries 31 of multiple construction machines 30, the difference (chargeable energy amount) between the total amount of power when all are fully charged and the current remaining battery power is calculated, and a charging schedule for the first secondary battery 11 and the second secondary battery 21 is created so that the total amount of power of the first secondary battery 11 and the second secondary battery 21 is always equal to or greater than the chargeable energy amount. Because the first secondary battery 11 and the second secondary battery 21 have large capacities and require a long time to fully charge, the batteries are scheduled to be transported to a location where they can be connected to a commercial power source 1, for example, during the night when no work is being done, and then charged.

[0039] In this case, in order to ensure that the total amount of power of the first secondary battery 11 and the second secondary battery 21 is always equal to or greater than the chargeable amount of power, for example, the rate of decrease (differential value) of the total remaining battery power of the first secondary battery 11 and the second secondary battery 21 over a predetermined period is calculated, the period until the total remaining battery power of the first secondary battery 11 and the second secondary battery 21 falls below a predetermined value is estimated, and the day before that is scheduled as the charging day. Also, for example, the rate of increase (differential value) of the integrated amount of power consumed by the third secondary battery 31 over a predetermined period is calculated, the period until this integrated value reaches a predetermined value or more is estimated, and the day before that is scheduled as the charging day.

[0040] Furthermore, since the charging system 1 according to this embodiment is intended to be used at a site where the commercial power supply 100 is not available, as described above, when charging the first secondary battery 11 and the second secondary battery 21, they must be transported to a location where they can be connected to the commercial power supply 100 and charged, such as overnight when no work is being performed. Here, the sub-power supply 20 is more portable than the main power supply 10, while the main power supply 10 is larger and less portable. Therefore, it may be desirable to use the second secondary battery 21 of the sub-power supply 20 while it is being used, with priority given to charging, and to use the power of the first secondary battery 11 of the main power supply 10 only when necessary. In other words, it is desirable to frequently charge and discharge the sub-power supply 20, while minimizing the frequency of charging the main power supply 10. In this case, for example, the above calculation may be performed taking into account a condition that the number of times the main power supply 10 can be charged during the work period is set to an upper limit. Alternatively, the above calculation may be performed by replacing the amount of charged power of the first secondary battery 11 with a value obtained by subtracting the amount of power to be reserved from the remaining battery charge, rather than the amount of power remaining.

[0041] When charging of the main power supply 10 from the sub-power supply 20 is possible, it is desirable to schedule charging of the sub-power supply 20 taking into consideration the amount of power to be charged into the main power supply 10.

[0042] Once the charging of the main power supply unit 10 and the sub-power supply unit 20 has been scheduled as described above, a charging schedule for the construction machine 30 is incorporated into the schedule for the nighttime on other days and times. In the example described above, three construction machines 30 can be charged simultaneously from the main power supply unit 10 and the sub-power supply unit 20, with one machine being charged using rapid charging and the other two being charged using normal charging. It is desirable to charge the construction machines 30 at night when no work is being performed, but it is entirely possible that daytime work will be interrupted to charge the machines as needed.

[0043] In principle, the lower the remaining battery power of the construction machine 30, the higher the priority for charging. In other words, construction machines 30 with low remaining battery power are prioritized in the schedule to prevent work from being stopped. At this time, the construction machine 30 with the lowest remaining battery power is charged using rapid charging, and the others are charged using normal charging.

[0044] The priority may be calculated from an arithmetic expression that uses multiple parameters as variables. For example, the parameters may include the current remaining battery charge (the lower the charge, the higher the priority), as described above, as well as the rate at which the remaining battery charge decreases (the higher the charge, the higher the priority), the amount of battery consumption (integrated value) (the higher the priority), the type of construction machine 30 (the more power a construction machine 30 consumes, the higher the priority), the progress of the work using the construction machine 30 (the slower the construction machine 30, the higher the priority), and the load on the construction machine 30 during work (integrated value, maximum value, average value, etc.) (the greater the load, the higher the priority). The priority is calculated from these parameters, and a charging schedule is created so that construction machines 30 with particularly high priorities are charged in order, with rapid charging being given priority to construction machines 30 with particularly high priorities.

[0045] Note that the charging time required for rapid charging is different from the time required for normal charging, and the charging time also differs for each construction machine 30 depending on the remaining battery charge at that time. Therefore, it is desirable to estimate and calculate the charging time required for each construction machine 30 while taking the above priority into consideration, and to create a charging schedule that allocates rapid charging and normal charging so that charging is ultimately completed in order from the construction machine 30 with the highest priority.

[0046] Furthermore, for example, an AI that has learned an optimal charging schedule based on any or all of the above parameters may be prepared, and any or all of the above parameters may be input into the AI ​​to generate information on the optimal charging schedule.

[0047] 4 is a flowchart showing the operation of the management device in the charging system according to this embodiment. First, the information acquisition unit 61 acquires work-related information 65 related to the work to be performed (S1). Based on the acquired work-related information 65, the work design unit 62a creates the above-mentioned work design information (S2). Actual work is started based on the created work design information. When the work starts, the information acquisition unit 61 acquires battery-related information 65 (information related to the third secondary battery 31 and other information related to the work (e.g., work time, load information, work position, etc.)) transmitted from the construction machine 30 (S3), and similarly acquires battery-related information 65 (information related to the first secondary battery 11 and information related to the second secondary battery) transmitted from the main power supply unit 10 and the sub-power supply unit 20 (S4). Based on the battery-related information 65 acquired in S3 and S4, the charging schedule unit 62b calculates the charging connection destination (the normal charging connection port of the main power supply device 10 or the rapid charging connection port of the rapid charging device 40) and the charging priority for each construction machine 30, and creates a charging schedule based on the priority (S5). The created charging schedule is notified to the operator of each device by the output control unit 63 (S6). For example, in the case of the main power supply device 10 or the sub-power supply device 20, the charging schedule may be sent to these power supply devices themselves, or the charging schedule may be sent to a terminal device such as a smartphone, tablet, or laptop computer owned by a person in charge of managing these power supply devices. Furthermore, for example, in the case of the construction machine 30, the charging schedule may be sent to the construction machine 30 itself, or the charging schedule may be sent to a terminal device such as a smartphone, tablet, or laptop computer owned by the operator operating the construction machine 30 or the work manager.

[0048] After the charging schedule is notified, the process returns to S3, where information transmitted from the construction machine 30, the main power supply unit 10, and the sub-power supply unit 20 is constantly received and stored for subsequent calculations, while the charging schedule for the next charging is calculated in real time.

[0049] As described above, the charging system according to this embodiment includes a main power supply unit 10 that has a first secondary battery 11 that charges with external power and charges the power stored in the first secondary battery 11 into the third secondary battery 31 of the construction machine 30, and a sub-power supply unit 20 that has a second secondary battery 21 that charges with external power and functions as an auxiliary power source for the first secondary battery 11 either connected to the main power supply unit 10 or independently, so that the construction machine 30 can be sufficiently charged and construction work can be carried out efficiently.

[0050] Here, in particular, by configuring the system to include a main power supply unit that has a first secondary battery that charges with external power and charges the power stored in the first secondary battery into a third secondary battery that supplies power as a driving power source for each of multiple construction machines for construction work, and a sub-power supply unit that has a second secondary battery that charges with external power and is connected to the main power supply unit and functions as an auxiliary power source for the first secondary battery, it is possible to charge the construction machines 30 sufficiently for the power required for construction work at a construction work site where multiple construction equipment 30 is used, and construction work can be carried out more efficiently.

[0051] In addition, if necessary, a management device 50 is provided to manage the usage status of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31, so that the usage status and charging status of the first secondary battery of the construction machinery, the second secondary battery of the main power supply device, and the third secondary battery of the sub-power supply device can be properly managed.

[0052] Furthermore, if necessary, the management device 50 estimates the amount of power used by the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31 based on work information 64 related to the work to be done, and calculates the number of construction machines 30 and sub-power supply units 20 required for the work, so that proper preparations can be made as a preparation stage for the work to proceed smoothly.

[0053] Furthermore, if necessary, the management device 50 calculates a charging schedule for the first secondary battery 11, the second secondary battery 21 and the third secondary battery 31 based on information regarding the status of the first secondary battery 11, the second secondary battery 21 and the third secondary battery 31, so that charging can be carried out to allow work to proceed smoothly and efficiently.

[0054] Furthermore, if necessary, a rapid charging device 40 is provided which is connected to the main power supply unit 10 and which rapidly charges the third secondary battery 31 of the construction machine 30 with the power stored in the first secondary battery 11 and / or the second secondary battery 21, and the main power supply unit 10 has an AC conversion unit 15 which is connected to the construction machine 30 and which normally charges the third secondary battery 31 with the power stored in the first secondary battery 11 and / or the second secondary battery 21, and the management device 50 calculates a charging schedule for the third secondary battery 31 by the rapid charging device 40 and a charging schedule for the third secondary battery 31 by the AC conversion unit 15 based on information regarding the status of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31, so that charging of the third secondary battery 31 by rapid charging or normal charging can be performed optimally, taking priority into consideration, depending on the status of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31.

[0055] Furthermore, if necessary, the management device 50 estimates the amount of power that will be consumed from the third secondary battery 31 based on changes in the remaining battery charge to date, and calculates a charging schedule for the third secondary battery 31.This allows the amount of power that will be required in the future to be estimated from the usage pattern of the third secondary battery 31 in the construction machine 30, and allows work to proceed while charging so that work is not delayed due to insufficient charging.

[0056] Furthermore, if necessary, the management device 50 calculates a charging schedule for the third secondary battery 31 based on the remaining battery charge of the third secondary battery 31 and the type of construction machinery 30 on which the third secondary battery 31 is installed, so that an appropriate charging schedule can be calculated, for example, so that construction machinery 30 with longer operating times and greater power consumption can be given priority for charging.

[0057] Furthermore, if necessary, the management device 50 calculates a charging schedule for the third secondary battery 31 based on the remaining battery charge of the third secondary battery 31 and the progress of the work being carried out by the construction machine 30 on which the third secondary battery 31 is installed.Therefore, for example, in the case of a construction machine 30 whose work progress is delayed, it is estimated that the utilization rate will tend to increase in the future and the number of times it will be charged will increase, and conversely, in the case of a construction machine 30 whose work progress is progressing, it is estimated that the utilization rate will tend to decrease in the future and the number of times it will be charged will decrease, and it is possible to calculate an appropriate charging schedule according to these trends.

[0058] Furthermore, if necessary, a rapid charging device is provided that is connected to the main power supply unit 10 and rapidly charges the electricity stored in the first secondary battery 11 and / or the second secondary battery 21 into the third secondary battery 31 of the construction machine 30, thereby enabling efficient charging even for large-capacity secondary batteries such as the third secondary battery 31 of a large construction machine 30. [Explanation of symbols]

[0059] 1 Charging System 10 Main Power Supply 11 1st secondary battery 12 1st charger 13 Communications Department 14 First Control Section 15 AC conversion unit 20 Sub-power supply unit 21 2nd secondary battery 22 2nd charger 23 Communications Department 24 Second Control Section 25 Cable 30 Construction machinery 31 3rd secondary battery 33 Communications Department 34 Third Control Section 40 Quick charging device 44 4th Control Section 45 DC conversion unit 50 Management device 51 CPU 52 RAM 53 ROM 54 Hard Disk 55 Communication I / F 56 Operation Panel 57 Display 60 Computer 61 Information Acquisition Department 62 Arithmetic section 62a Work Design Department 62b Charging schedule section 63 Output control section 64 Battery-related information 65 Work-related information 100 Commercial power

Claims

1. a main power supply device having a first secondary battery that is charged with external power, and that charges the power stored in the first secondary battery into a third secondary battery that is mounted on each of a plurality of construction machines and supplies power as a drive power source for each of the construction machines; a sub-power supply device that has a second secondary battery that charges with external power, is connected to the main power supply device, and functions as an auxiliary power supply for the first secondary battery; a management device that manages usage patterns of the first secondary battery, the second secondary battery, and the third secondary battery, The management device estimates the amounts of power used by the first secondary battery, the second secondary battery, and the third secondary battery based on work information related to construction work to be performed by the construction machine, and calculates the number of construction machines and sub-power supply units required for the construction work. A charging system characterized by:

2. A main power supply device having a first secondary battery that charges with external power, and charging the power stored in the first secondary battery to a third secondary battery that is mounted on each of a plurality of construction machines and supplies power as a drive power source for each of the construction machines; a sub-power supply device that has a second secondary battery that charges with external power, is connected to the main power supply device, and functions as an auxiliary power supply for the first secondary battery; a management device that manages usage patterns of the first secondary battery, the second secondary battery, and the third secondary battery, The management device calculates a charging schedule for the first secondary battery, the second secondary battery, and the third secondary battery based on information on the states of the first secondary battery, the second secondary battery, and the third secondary battery. A charging system characterized by:

3. 3. The charging system according to claim 2, a rapid charging device connected to the main power supply device for rapidly charging a third secondary battery of the construction machine with electric power stored in the first secondary battery and / or the second secondary battery; the main power supply device has a charging unit that is connected to the construction machine and performs normal charging of the third secondary battery with power stored in the first secondary battery and / or the second secondary battery, a charging unit configured to charge the third secondary battery by the rapid charging device and the third secondary battery by the charging section, based on information regarding the states of the first secondary battery, the second secondary battery, and the third secondary battery;

4. 3. The charging system according to claim 2, A charging system characterized in that the management device estimates the power that will be consumed from the third secondary battery based on changes in the remaining battery charge up to now, and calculates a charging schedule for the third secondary battery.

5. 3. The charging system according to claim 2, A charging system characterized in that the management device calculates a charging schedule for the third secondary battery based on the remaining battery charge of the third secondary battery and the type of construction machine in which the third secondary battery is installed.

6. 2. The charging system according to claim 1, A charging system characterized in that the management device calculates a charging schedule for the third secondary battery based on the remaining battery charge of the third secondary battery and the progress of the construction work being carried out by the construction machine in which the third secondary battery is installed.

7. 3. The charging system according to claim 1, A charging system characterized by comprising a rapid charging device connected to the main power supply device and rapid charging the third secondary battery of the construction machine with power stored in the first secondary battery and / or the second secondary battery.

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