Charging system

Abstract

This invention provides a charging system that charges multiple construction machines powered by electricity from a main power supply unit and a sub-power supply unit. [Solution] The system includes a main power supply unit 10 which has a first secondary battery 11 that charges from an external source and uses the power stored in the first secondary battery 11 to charge a third secondary battery 31 that is mounted on each of the multiple construction machines 30 and supplies power to each of the construction machines as a power source for driving them, and a sub power supply unit 20 which has a second secondary battery 21 that charges from an external source, is connected to the main power supply unit 10 and functions as an auxiliary power source for the first secondary battery 11. The system also includes a management device 50 which manages the usage patterns of the first secondary battery 11, the second secondary battery 21 and the third secondary battery 31, and the management device 50 calculates the 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.

Description

Technical Field

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[0001] The present invention relates to a charging system for charging construction machinery.

Background Art

[0002] Patent Document 1 discloses a power supply device that can be charged from a secondary battery and is movable in an electric hydraulic excavator. This power supply device is a movable power supply device equipped with a plurality of secondary batteries, and includes a power reception port that can be connected to a commercial power supply via a power reception cable, a charger connected to the power reception port, a first switch that selectively connects or disconnects the secondary battery 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 selectively connects or disconnects the secondary batteries connected in series to each other and connected to the power transmission port.

[0003] Patent Document 2 discloses a power supply device that connects to a spare battery. The power supply device includes a rechargeable 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 and a load, and a changeover switch that switches whether the load is connected to the main battery or the spare battery. The spare connection circuit has two wirings, a first wiring and a second wiring that are arranged in parallel, and a first connection port and a second connection port corresponding to each wiring, for connection to one spare battery.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

[0005] However, the technology described in Patent Document 1 describes how, when supplying power to an electric hydraulic excavator from multiple secondary batteries in a power supply device by switching the circuit, the multiple secondary batteries are connected in series to increase the transmission voltage, and when charging the multiple secondary batteries 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 once by the multiple secondary batteries in the power supply device.

[0006] Furthermore, while the technology described in Patent Document 2 efficiently supplies power by coordinating a main battery and a backup battery, it does not disclose how to supply power to construction machinery that uses batteries as a power source.

[0007] The present invention was made to solve the above problems, and aims to provide a charging system that charges construction machinery using a main power supply and a sub-power supply so as to ensure a sufficient amount of power for charging construction machinery that is powered by electricity. [Means for solving the problem]

[0008] The charging system according to the present invention comprises a main power supply unit having a first secondary battery that charges power from an external source, and the power stored in the first secondary battery charges 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 unit having a second secondary battery that charges power from an external source, and which is connected to the main power supply unit and functions as an auxiliary power source for the first secondary battery.

[0009] Thus, the charging system according to the present invention includes a first secondary battery that charges power from an external source, and a main power supply unit that charges a third secondary battery, which is mounted on each of the multiple construction machines and supplies power as the drive power for each construction machine, with the power stored in the first secondary battery. This provides the effect that the third secondary battery of the construction machine can be sufficiently charged at the work site from the first secondary battery of the main power supply unit and the second secondary battery of the sub-power supply unit. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows the system configuration of a charging system according to the first embodiment of the present invention. [Figure 2] This figure shows the hardware configuration of the management device in the charging system according to the first embodiment of the present invention. [Figure 3] This is a functional block diagram of the computer of the management device in the charging system according to the first embodiment of the present invention. [Figure 4] This is a flowchart showing the operation of the control device in the charging system according to the first embodiment of the present invention. [Modes for carrying out 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 portable power supply unit that can charge multiple construction machines, which are powered by electricity stored in a secondary battery, at a work site. 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 has a first secondary battery 11 that charges external power such as commercial power and serves as the main power supply unit, a sub-power supply unit 20 which has a second secondary battery 21 that charges external power such as commercial power and serves as an auxiliary power supply for the main power supply unit 10, a rapid charger 40 which rapidly charges the third secondary battery 31 of 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 operations 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 includes a first charger 12 that charges the first secondary battery 11 with power from the commercial power supply 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 converts the power stored in the first secondary battery 11 to perform normal charging (charging with AC voltage, hereinafter referred to as normal charging) of the third secondary battery 31 of the construction machine 30.

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

[0015] In addition, in locations where the main power supply unit 10 is relatively easy to transport or where it is relatively easy to connect to the commercial power supply 100 (for example, a location where the commercial power supply 100 is available and there is a road), it is preferable that the main power supply unit 10 be charged via the first charger 12 from the commercial power supply 100. However, in locations where transportation is difficult or connection to the commercial power supply 100 is difficult (for example, a location deep in the mountains where there are no electrical facilities for the commercial power supply 100), the circuit configuration may be such that the main power supply unit 10 can be charged from the sub-power supply unit 20, which will be described later. That is, when the main power supply unit 10 and the sub-power supply unit 20 are connected, the sub-power supply unit 20 may be equipped with a changeover switch (not shown) to switch between connecting the sub-power supply unit 20 to the main power supply unit 10's first secondary battery 11 or to connecting it to the third secondary battery 31 of the construction machine 30 connected downstream of the main power supply unit 10, and the first control unit 14 may control the switching of this changeover switch based on the remaining battery level of the first secondary battery 11. Specifically, if the remaining charge of the first secondary battery 11 is below a predetermined level, the system may be controlled to charge the first secondary battery 11 from the sub-power supply unit 20, and if the remaining charge of the first secondary battery 11 is greater than the predetermined level, the system may be controlled to supply power from the sub-power supply unit 20 to the construction machine 30.

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

[0017] The secondary battery 21 of the sub-power supply unit 20 is charged from the commercial power supply 100 via the second charger 22. The battery level and charge / discharge management and control of the secondary battery 21 are performed by the second control unit 24, and various information about the secondary battery 21 acquired here can be transmitted via the communication unit 23 to the control unit 14 and management device 50 of the main power supply unit 10.

[0018] Note that the second secondary battery 21 can be connected to the first secondary battery 11 of the main power supply device 10 by a cable 25. It may be possible to supply power to the construction machine 30 as a large-capacity secondary battery that integrates the first secondary battery 11 and the second secondary battery 21. Alternatively, power may be selectively supplied to the construction machine 30 from either the first secondary battery 11 or the second secondary battery 21. Also, as described above, the second secondary battery 21 may be able to charge the first secondary battery 11. That is, in any case, the sub-power supply device 20 will function as an auxiliary power supply for the main power supply device 10.

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

[0020] Specifically, the fourth control unit 44 acquires information on 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 communication line of the cable, and controls the DC conversion unit 45 to convert the battery voltages of the first secondary battery 11 and / or the second secondary battery 21 into appropriate DC voltage values according to the state of the third secondary battery 31. Also, as charging progresses by rapid charging, the state of the third secondary battery 31 changes (the charge amount increases), so control of the DC voltage corresponding to this change will also be performed. By performing such precise control at a high DC voltage, it becomes possible to charge rapidly compared to normal voltage.

[0021] The construction machine 30 is an electric construction machine equipped with a third secondary battery 31 and using the third secondary battery 31 as a drive source, and various types such as hydraulic excavators, wheel loaders, carrier dumpers, flashers, mobile cranes, etc. are applicable. The construction machine 30 includes a third control unit 34 that manages and controls the third secondary battery 31 serving as a drive source, and a communication unit 33 for performing wireless communication with external devices. The battery information regarding 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. In addition, information regarding the driving mode of the construction machine 30 (such as information on what operations were performed for how long, etc.) is also transmitted.

[0022] The third secondary battery 31 of the construction machine 30 can be rapidly charged using the rapid charging device 40, and can also be normally energized via the AC conversion unit 15 of the main power supply device 10. In the rapid charging by the rapid charging device 40, one construction machine 30 can be charged in one charging (for example, charged at 120 kW). In normal charging, multiple construction machines 30 can be charged in one charging (for example, for 60 kW, 2 construction machines 30 can be charged at 25 kW each). That is, in this example case, up to 3 construction machines 30 can be charged simultaneously. Note that some construction machines 30 are not configured to support rapid charging, and construction machines 30 that do not support rapid charging can only be charged by normal charging.

[0023] The management device 50 acquires information on the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31 provided in the main power supply device 10, the sub - power supply device 20, and the construction machine 30 respectively, and creates an appropriate schedule for the charge and discharge of each secondary battery. Also, based on the information regarding the work to be performed, work design is carried out and work design information is created.

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

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

[0026] Figure 3 is a functional block diagram of the computer of the management device in the charging system according to this embodiment. In Figure 3, the computer 60 of the management device 50 includes an information acquisition unit 61 that acquires battery-related information 64 and work-related information 65 in construction work transmitted from various external devices (e.g., main power supply unit 10, sub-power supply unit 20, construction machinery 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 the display 57 or transmits them to an external device. The calculation unit 62 also includes a work design unit 62a that designs the work to be performed and creates work design information, 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 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, respectively. The information acquisition unit 61 receives information (for example, charge / discharge information, usage status information, etc.) transmitted from each of these devices regarding the secondary batteries (first secondary battery 11, second secondary battery 21, third secondary battery 31) as battery-related information 64.

[0028] Alternatively, this information may be collected by the control unit 14 of the main power supply unit 10 and then transmitted collectively 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 access the cloud storage to acquire each piece of information.

[0029] The information acquisition unit 61 acquires work-related information 65 related to the work to be performed, in addition to the battery-related information 64 concerning the secondary battery. Specifically, the work-related information 65 includes information such as the work period, work content, and work scale in construction work. The work-related information 65 may be manually entered by the system administrator, received from other terminal devices, or 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, it estimates the total amount of electricity required from the start to the end of the work based on the work period, work content, and work scale of the construction work. For example, for each case of various work periods, work content, and work scale, operational estimation information including the number of construction machines 30, operating hours, and load applied may be pre-registered for multiple model cases, and operational estimation information may be extracted from the model case with the most similar conditions. Alternatively, the operational estimation information of this extracted model case may be corrected by a predetermined calculation formula based on the work information 64 acquired by the information acquisition unit 61 (for example, by extracting operational estimation information from two similar model cases and calculating their average value) to obtain operational estimation information.

[0031] In addition to extracting pre-registered model cases of operational estimation information as described above, it is also possible to prepare an AI that has already learned such operational estimation information, and use the work-related information 65 acquired by the information acquisition unit 61 as input information to generate corresponding operational estimation information.

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

[0033] Generally, one main power supply unit 10 and one or more associated sub-power supply units 20 are used at each work site. However, 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 will be calculated. For example, for the main power supply units 10, which are difficult to transport, the number of work bases is determined according to the size and terrain of the work site, and the number of units is calculated so that one main power supply unit 10 can be placed at each base. Since the sub-power supply units 20 are relatively easy to transport, the number of units is calculated so that the total amount of power obtained above can be covered while charging as needed (considering the number of charging cycles that can be performed during the work period, etc.).

[0034] Furthermore, for these calculations, similar to the operational estimation information described above, 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 matching the current scale may be extracted to calculate the optimal number of main power supply units 10 and sub-power supply units 20. Alternatively, the optimal number of main power supply units 10 and sub-power supply units 20 may be calculated by AI using information from the work site and total power consumption as input information.

[0035] Through this process, work design information is created that includes operational estimation information such as the number of construction machines 30, operating hours, and loads, as well as information on the number of main power supply units 10 and sub-power supply units 20 required to power these machines.

[0036] The charging schedule unit 62b calculates the priority order 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 in real time based on that priority order.

[0037] When creating charging schedule information, it is necessary to create a charging schedule that shows the priority order in which the primary secondary battery 11 of the main power supply unit 10 and the secondary secondary battery of the sub-power supply unit 20 will charge the tertiary secondary batteries 31 of the multiple construction machines 30, and also to take into account when the primary secondary battery 11 of the main power supply unit 10 and the secondary secondary battery of the sub-power supply unit 20 will be charged from the commercial power supply.

[0038] Specifically, for example, for the third secondary batteries 31 of multiple construction machines 30, the difference between the total energy when all are fully charged and the current battery level (rechargeable energy) is calculated, and a charging schedule for the first secondary battery 11 and the second secondary battery 21 is created, taking into consideration that the total energy of the first secondary battery 11 and the second secondary battery 21 is always greater than or equal to the rechargeable energy. Since the first secondary battery 11 and the second secondary battery 21 have large capacities and require a lot of time to fully charge, a schedule is set up to transport them 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 charge them there.

[0039] In this case, in order to ensure that the total amount of energy of the first secondary battery 11 and the second secondary battery 21 is always greater than or equal to the amount of energy that can be charged, for example, the rate of decrease (derivative value) of the total remaining battery energy 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 energy 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 a charging day. Alternatively, for example, the rate of increase (derivative value) of the cumulative amount of power consumed by the third secondary battery 31 over a predetermined period is calculated, the period until this cumulative value exceeds a predetermined value is estimated, and the day before that is scheduled as a charging day.

[0040] Furthermore, since the charging system 1 according to this embodiment is intended for use in locations without commercial power supply 100, as described above, when charging the first secondary battery 11 and the second secondary battery 21, it is necessary to transport them to a location where they can be connected to commercial power supply 100, such as during the night when no work is being performed, and then charge them. Here, the sub-power supply unit 20 is more portable than the main power supply unit 10, while the main power supply unit 10 is large and not very portable. Therefore, it may be desirable to use the sub-power supply unit 20 while prioritizing the charging of the second secondary battery 21, and to use the power of the first secondary battery 11 of the main power supply unit 10 only when necessary. In other words, it is desirable to frequently charge and discharge the sub-power supply unit 20, while minimizing the charging frequency of the main power supply unit 10. In this case, for example, the above calculation may be performed taking into account the condition that the number of times the main power supply unit 10 can be charged during the work period is set as the upper limit, or the above calculation may be performed by replacing the amount of power to be charged of the first secondary battery 11 with a value obtained by subtracting the amount of power that should be reserved, rather than using the battery remaining amount as is.

[0041] Furthermore, if charging from the sub-power supply unit 20 to the main power supply unit 10 is to be enabled, it is desirable to schedule the charging of the sub-power supply unit 20 taking into account the amount of power to be charged to the main power supply unit 10.

[0042] As described above, once the charging of the main power supply unit 10 and the sub-power supply unit 20 is scheduled, the charging schedule for the construction machinery 30 is incorporated into the nighttime hours at other times. In the example above, it is possible to charge three construction machines 30 simultaneously from the main power supply unit 10 and the sub-power supply unit 20, with one machine being rapidly charged and two being normally charged. It is preferable that the construction machinery 30 be charged during the night when no work is being performed, but it is also quite possible that daytime work may be interrupted to perform charging if necessary.

[0043] In principle, the charging of construction machinery 30 is prioritized based on the battery level of the machine. That is, to prevent work from stopping, construction machinery 30 with low battery levels are given priority in the schedule. At this time, the construction machinery 30 with the lowest battery level is charged using rapid charging, while the others are charged using normal charging.

[0044] Prioritization can be calculated using an arithmetic formula with multiple parameters as variables. For example, parameters could include the current battery level (lower is better, higher priority), the rate of decrease in battery level (higher is better, higher priority), battery consumption (cumulative value) (higher is better, higher priority), the type of construction machine 30 (construction machines 30 with higher power consumption have higher priority), the progress of the work using the construction machine 30 (construction machines 30 that are behind schedule have higher priority), and the load on the construction machine 30 during work (cumulative value, maximum value, average value, etc.) (higher is better, higher priority). Prioritization can be calculated from these parameters, and the construction machines 30 with the highest priority will be charged in order, with a charging schedule created so that construction machines 30 with particularly high priority are given priority for rapid charging.

[0045] Furthermore, the charging time required for rapid charging differs from the charging time required for normal charging, and the charging time also varies for each construction machine 30 depending on the remaining battery level at the time. Therefore, it is desirable to create a charging schedule that takes the above priority into account, estimates the charging time required for each construction machine 30, and ultimately allocates the machines to rapid charging and normal charging in order, starting with the construction machine 30 with the highest priority.

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

[0047] Figure 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 regarding the work to be performed (S1). Based on the acquired work-related information 65, the work design unit 62a creates work design information as described above (S2). Based on the created work design information, the actual work is started. When the work is started, the information acquisition unit 61 acquires battery-related information 65 transmitted from the construction machine 30 (information about the third secondary battery 31 and other work-related information (e.g., work time, load information, work position, etc.)) (S3), and similarly acquires battery-related information 65 transmitted from the main power supply unit 10 and the sub power supply unit 20 (information about the first secondary battery 11 and information about the second secondary battery) (S4). Based on the battery-related information 65 acquired in S3 and S4, the charging schedule unit 62b calculates the charging destination (the normal charging port of the main power supply unit 10, or the rapid charging port of the rapid charging device 40) and the charging priority for each construction machine 30, and creates a charging schedule according to 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 unit 10 or the sub-power supply unit 20, the charging schedule may be sent to the power supply unit itself, or it may be sent to a terminal device such as a smartphone, tablet, or laptop held by the person in charge of managing these power supply units. Also, for example, in the case of the construction machine 30, the charging schedule may be sent to the construction machine 30 itself, or it may be sent to a terminal device such as a smartphone, tablet, or laptop held by the operator or work supervisor operating the construction machine 30.

[0048] After the charging schedule is notified, the system returns to S3, where it continuously receives and stores information transmitted from the construction machine 30, the main power supply unit 10, and the sub-power supply unit 20 for subsequent calculations, while calculating the charging schedule for the next charge in real time.

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

[0050] In particular, by providing a configuration that includes a main power supply unit having a first secondary battery that charges external power and uses the power stored in the first secondary battery to charge a third secondary battery that supplies power as the driving power source for the construction work of multiple construction machines, and a sub-power supply unit having a second secondary battery that charges external power, is connected to the main power supply unit, and functions as an auxiliary power source for the first secondary battery, it is possible to sufficiently charge the power required for the construction work of the construction machines 30 at a construction site where multiple construction machines 30 are used, and construction work can be carried out more efficiently.

[0051] Furthermore, if necessary, the system is equipped with a management device 50 for managing the usage patterns of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31, thereby enabling proper management of the usage and charging status of the first secondary battery of the construction machine, the second secondary battery of the main power supply unit, and the third secondary battery of the sub-power supply unit.

[0052] Furthermore, if necessary, the management device 50 can estimate the amount of power used by the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31 based on the work information 64 related to the work to be performed, and calculate the number of construction machines 30 and sub-power supply devices 20 required for the work. In this way, as a preparatory step for the work, preparations can be properly made to ensure that the work proceeds 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 their status, thereby enabling charging to proceed smoothly and efficiently.

[0054] Furthermore, the system includes a rapid charger 40 that, if necessary, connects to the main power supply 10 and 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. The main power supply 10 has an AC converter 15 that connects to the construction machine 30 and performs normal charging of the third secondary battery 31 with the power stored in the first secondary battery 11 and / or the second secondary battery 21. The management device 50 calculates the charging schedule for the third secondary battery 31 by the rapid charger 40 and the charging schedule for the third secondary battery 31 by the AC converter 15 based on information regarding the status of the first secondary battery 11, the second secondary battery 21, and the third secondary battery 31. This allows for optimal charging of the third secondary battery 31 by rapid charging or normal charging, 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 power of the third secondary battery 31 to be consumed based on the changes in the remaining battery level to date and calculates the charging schedule for the third secondary battery 31. This allows the construction machine 30 to estimate the amount of power that will be needed in the future based on how the third secondary battery 31 is used, enabling the machine to proceed with work while charging the battery so that work is not interrupted due to insufficient charge.

[0056] Furthermore, if necessary, the management device 50 calculates a charging schedule for the third secondary battery 31 based on the remaining battery level of the third secondary battery 31 and the type of construction machine 30 in which the third secondary battery 31 is installed. This allows for the calculation of an appropriate charging schedule, such as prioritizing the charging of construction machines 30 with longer operating hours and higher power consumption.

[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 performed by the construction machine 30 equipped with the third secondary battery 31. For example, if the construction machine 30 is behind schedule, it is estimated that the operating rate will increase and the number of charging cycles will increase. Conversely, if the construction machine 30 is ahead of schedule, it is estimated that the operating rate will decrease and the number of charging cycles will decrease. The management device 50 can then calculate an appropriate charging schedule according to these trends.

[0058] Furthermore, if necessary, a rapid charging device is provided that connects to the main power supply unit 10 and 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. This allows for efficient charging of secondary batteries with large capacities, 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 Unit 15 AC conversion unit 20 Sub-power supply unit 21 2nd secondary battery 22 2nd charger 23 Communications Department 24 Second Control Unit 25 Cables 30 Construction Machinery 31 3rd secondary battery 33 Communications Department 34 Third Control Unit 40 Quick charging device 44. Section 4 45 DC conversion section 50 Management device 51 CPU 52 RAM 53 ROM 54 Hard Disks 55 Communication I / F 56 Control Panel 57 displays 60 Computer 61 Information Acquisition Department 62 Arithmetic section 62a Work Design Department 62b Charging Schedule Section 63 Output control unit 64 Battery-related information 65. Work-related information 100 Commercial power

Claims

1. A main power supply unit having a first secondary battery that charges external power, and which charges a third secondary battery, which is mounted on each of a plurality of construction machines and supplies power as the drive power for each of the construction machines, with the power stored in the first secondary battery. A charging system characterized by comprising a sub-power supply unit having a second secondary battery that charges from an external source, which is connected to the main power supply unit and functions as an auxiliary power supply for the first secondary battery.

2. In the charging system according to claim 1, A charging system characterized by comprising a management device for managing the usage patterns of the first secondary battery, the second secondary battery, and the third secondary battery.

3. In the charging system according to claim 2, A charging system characterized in that the management device estimates the amount of power used by the first secondary battery, the second secondary battery, and the third secondary battery based on work information relating to the construction work to be performed by the construction machine, and calculates the number of construction machines and sub-power supply devices required for the construction work.

4. In the charging system according to claim 2 or 3, A charging system characterized in that the management device calculates a charging schedule for the first secondary battery, the second secondary battery, and the third secondary battery based on information regarding the state of the first secondary battery, the second secondary battery, and the third secondary battery.

5. In the charging system according to claim 4, The main power supply unit is connected to a rapid charging device that rapidly charges the third secondary battery of the construction machine with the power stored in the first secondary battery and / or the second secondary battery. The main power supply unit has a charging unit that is connected to the construction machine and normally charges the third secondary battery with the power stored in the first secondary battery and / or the second secondary battery. A charging system characterized in that the management device calculates a charging schedule for the third secondary battery by the rapid charger and a charging schedule for the third secondary battery by the charging unit, based on information regarding the status of the first secondary battery, the second secondary battery, and the third secondary battery.

6. In the charging system according to claim 4, A charging system characterized in that the management device estimates the power to be consumed by the third secondary battery based on the changes in the remaining battery charge to date, and calculates a charging schedule for the third secondary battery.

7. In the charging system according to claim 4, 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.

8. In the charging system according to claim 4, A charging system characterized in that the management device calculates a charging schedule for the third secondary battery based on the remaining charge of the third secondary battery and the progress of the construction work performed by the construction machine equipped with the third secondary battery.

9. In the charging system according to claim 1, A charging system characterized by comprising a rapid charging device connected to the main power supply unit, which rapidly charges the third secondary battery of the construction machine with the power stored in the first secondary battery and / or the second secondary battery.

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