JP2022049353A - Supply system, industrial vehicle, and feeder - Google Patents

Abstract

To provide a supply system which can ease temperature rise during rapid charging without providing a cooling device which generates a fluid cooled by an industrial vehicle, and to provide the industrial vehicle and a feeder.SOLUTION: A supply system includes an industrial vehicle and a supply part provided at an exterior of the industrial vehicle and connected to the industrial vehicle. The industrial vehicle has a power storage device and a medium passage in which a first cooling medium for cooling the power storage device circulates. The supply part has: a charging part which supplies electric power to the power storage device; and a cooling part which supplies the first cooling medium to the medium passage.SELECTED DRAWING: Figure 2

Description

The present invention relates to a supply system, an industrial vehicle and a supply machine.

Traditionally, industrial vehicles capable of cooling batteries have been known. Patent Document 1 discloses a forklift in which an air conditioner and a battery are connected by a duct or the like. The battery is cooled by the cold air supplied from the air conditioner. In addition, Patent Document 1 discloses that the battery may be a secondary battery such as a lithium ion battery.

Japanese Unexamined Patent Publication No. 2010-52894

By the way, it is generally known that when a vehicle battery (secondary battery) is rapidly charged, the amount of heat generated is large and the temperature of the battery becomes high. When the battery is charged or discharged in a high temperature state, the period for which the battery can be used may be shortened. Therefore, when the battery is rapidly charged, it has been required to cool the battery appropriately. As an example of a method for cooling a battery of a general vehicle, there is a method of providing an air conditioner for cooling the battery as described in Patent Document 1 in the vehicle.

Here, in order to cool the battery, even if the industrial vehicle is provided with a cooling device (air conditioner) that generates cold air and supplies the cold air as in Patent Document 1, the cooling device is effectively used. Is only during rapid charging of the battery, and the cooling device increases the weight and power consumption of the industrial vehicle. Therefore, an industrial vehicle without a cooling device can be more efficient in terms of operation of the industrial vehicle than an industrial vehicle equipped with a cooling device, and there is room for improvement in the battery cooling system of the industrial vehicle. There is. In particular, there has been a demand for a system capable of alleviating a temperature rise during rapid charging without providing a cooling device for generating a cooled fluid in an industrial vehicle.

It is an object of the present invention to provide a supply system, an industrial vehicle and a feeder capable of alleviating a temperature rise during rapid charging without providing a cooling device for generating a cooled fluid in an industrial vehicle.

The supply system according to one aspect of the present invention includes an industrial vehicle and a supply unit provided outside the industrial vehicle and connected to the industrial vehicle, and the industrial vehicle includes a power storage device and a first for cooling the power storage device. (1) It has a medium flow path for circulating a cooling medium, and a supply unit has a charging unit for supplying power to a power storage device and a cooling unit for supplying a first cooling medium to the medium flow path.

In this supply system, the charging unit of the supply unit supplies power to the power storage device of the industrial vehicle, and the cooling unit of the supply unit supplies the first cooling medium to the medium flow path of the industrial vehicle. As a result, the medium flow path can circulate the first cooling medium capable of cooling the power storage device, and the temperature of the power storage device can be lowered. Therefore, it is possible to mitigate the temperature rise during rapid charging without providing a cooling device for generating a cooled fluid in the industrial vehicle.

In the supply system according to the embodiment, the medium flow paths include a first flow path through which an external medium can flow, a second flow path through which the first cooling medium can flow from the cooling unit, a first flow path, and a first flow path. A third flow path that is connected to the two flow paths and is provided to cool the power storage device, and is connected to each of the first flow path, the second flow path, and the third flow path, and is used as an external medium or a first cooling medium. It may include a switching valve for switching so that either medium flows through the third flow path. In this case, by switching the switching valve, either the external medium or the first cooling medium flows through the third flow path. Therefore, for example, an appropriate medium having a high degree of contribution to heat exchange in the power storage device can be circulated in the third flow path. Further, after switching the medium to be distributed in the third flow path from the external medium to the first cooling medium by the switching valve, the temperature of the external medium is affected by continuing the flow of the first cooling medium in the third flow path. After suppressing it, the cooling effect due to the temperature of the first cooling medium can be sufficiently given to the power storage device. Therefore, by appropriately switching the switching valve, a medium suitable for heat exchange in the power storage device can be circulated in the third flow path.

In the supply system according to one embodiment, the industrial vehicle switches between the temperature measuring unit that measures the temperature of the power storage device and the temperature of the power storage device connected to the temperature measuring unit and the switching valve and measured by the temperature measuring unit. It may have a control unit for controlling valve switching. In this case, since the switching valve switches based on the temperature of the power storage device, for example, an appropriate medium among the external medium and the first cooling medium can be circulated in the third flow path. Therefore, by appropriately switching the switching valve based on the temperature of the power storage device, the control unit can distribute a medium suitable for heat exchange in the power storage device to the third flow path.

In the supply system according to the embodiment, a first cooling source for supplying the first cooling medium to the cooling unit is provided outside the industrial vehicle, and the cooling unit uses the first cooling medium supplied from the first cooling source as a medium. It may be supplied to the flow path. In this case, the first cooling medium from the first cooling source can be supplied to the medium flow path via the cooling unit. Therefore, the cooling performance of the power storage device can be appropriately ensured.

In the supply system according to one embodiment, a second cooling source for supplying a second cooling medium to the cooling unit is provided outside the industrial vehicle, and the cooling unit is provided with a second cooling medium supplied from the second cooling source. (1) A heat exchanger for cooling the cooling medium may be provided, and the first cooling medium may be circulated between the medium flow path and the heat exchanger. In this case, the first cooling medium circulates between the medium flow path and the heat exchanger. The temperature of the first cooling medium is lowered by exchanging heat with the second cooling medium in the heat exchanger. Therefore, since the first cooling medium is supplied to the industrial vehicle in a state where the temperature is appropriately lowered in the heat exchanger, the cooling performance for the power storage device can be ensured.

An industrial vehicle according to another aspect of the present invention includes a power storage device and a medium flow path through which a first cooling medium for cooling the power storage device is circulated, and the medium flow path supplies power to at least the power storage device. At that time, the first cooling medium is circulated.

According to this industrial vehicle, the same operation and effect as the above-mentioned supply system can be obtained.

The feeder according to another aspect of the present invention is a feeder that can be connected to an industrial vehicle having a power storage device and a medium flow path through which a first cooling medium for cooling the power storage device is circulated. The charging unit that supplies power to the battery, the cooling unit that supplies the first cooling medium to the medium flow path, the charging unit, and the power storage device are electrically connected, and the cooling unit is distributed so that the first cooling medium can be distributed. And a medium flow path are connected to each other, and an input unit that can be attached to and detached from an industrial vehicle is provided.

According to this feeder, the same operation and effect as the above-mentioned feeding system can be obtained.

In the feeder according to the embodiment, the first cooling medium may be compressed air. For example, compressed air tanks are installed in factories where many industrial vehicles operate. In this case, the cooling unit can supply the compressed air supplied from the compressed air tank to the medium flow path as the first cooling medium, for example. Therefore, it is possible to effectively utilize the existing infrastructure in the operating environment of the industrial vehicle and appropriately cool the power storage device.

According to the present invention, it is possible to provide a supply system, an industrial vehicle and a feeder capable of alleviating a temperature rise during rapid charging without providing a cooling device for generating a cooled fluid in the industrial vehicle.

It is a side view which shows the industrial vehicle of the supply system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the supply system which concerns on 1st Embodiment of this invention. It is a flowchart which shows the processing content of the supply system which concerns on 1st Embodiment and 2nd Embodiment of this invention. It is a block diagram which shows the supply system which concerns on 2nd Embodiment of this invention.

Hereinafter, preferred first and second embodiments of the supply system according to the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

[First Embodiment]
The supply system including the industrial vehicle and the supply machine of the first embodiment will be described. FIG. 1 is a side view showing an industrial vehicle of the supply system according to the first embodiment of the present invention. In FIG. 1, the industrial vehicle 1 is a forklift. The industrial vehicle 1 is not limited to a forklift and may include a towing car or the like. The industrial vehicle 1 includes a vehicle body frame 2 and a mast 3 arranged at the front portion of the vehicle body frame 2. The mast 3 consists of a pair of left and right outer masts 3a that are tiltably supported by the vehicle body frame 2 and an inner mast 3b that is arranged inside these outer masts 3a and can be raised and lowered with respect to the outer mast 3a. There is.

A lift cylinder 4 as an elevating hydraulic cylinder is arranged on the rear side of the mast 3. The tip of the piston rod 4p of the lift cylinder 4 is connected to the upper part of the inner mast 3b.

The lift bracket 5 is supported on the inner mast 3b so as to be able to move up and down. A fork 6 for loading luggage is attached to the lift bracket 5. The fork 6 is configured as an elevating object that is raised and lowered by the lift cylinder 4. A chain wheel 7 is provided on the upper portion of the inner mast 3b, and the chain 8 is mounted on the chain wheel 7. One end of the chain 8 is connected to the lift cylinder 4, and the other end of the chain 8 is connected to the lift bracket 5. When the lift cylinder 4 is expanded and contracted, the fork 6 moves up and down together with the lift bracket 5 via the chain 8. The lift cylinder 4 is operated, for example, by supplying hydraulic oil from a hydraulic pump driven by an electric motor (cargo handling motor) (not shown). The electric motor is operated by electric power from the power storage device 21 in the battery pack 20.

Tilt cylinders 9 as tilting hydraulic cylinders are supported on both the left and right sides of the vehicle body frame 2. The tip of the piston rod 9p of the tilt cylinder 9 is rotatably connected to the substantially central portion of the outer mast 3a in the height direction. When the tilt cylinder 9 is expanded and contracted, the mast 3 tilts. Like the lift cylinder 4, the tilt cylinder 9 is operated by supplying hydraulic oil from, for example, a hydraulic pump driven by an electric motor (not shown).

A driver's cab 10 is provided on the upper part of the vehicle body frame 2. The driver's cab 10 is a space provided for the driver to control steering of the industrial vehicle 1, tilting of the mast 3, raising and lowering of the fork 6, and the like. For example, the left and right sides of the driver's cab 10 are open so that the driver can easily get on and off. That is, the space inside the driver's cab 10 and the space outside the driver's cab 10 are continuous and are not partitioned by other components.

In the present embodiment, the driver's cab 10 is not provided with a large-scale cooling device (air conditioner) that provides a cooling function to the driver who gets into the driver's cab 10. The cooling function refers to a function of generating a cooled fluid and supplying the fluid. The function of generating a cooled fluid in the cooling device refers to, for example, a function of cooling the fluid with a refrigerant or the like to make the temperature lower than that of the fluid outside the cooling device (outside air, etc.). The cooled fluid includes, for example, cold air or a cooled liquid. The function of generating the cooled fluid in the cooling device includes, for example, the function of simply supplying the fluid to the cooling target, the function of moving the fluid around the cooling target, and the function of circulating the fluid around the cooling target. Is not included. For example, the cooling device does not include a device such as a cooling fan that supplies outside air and moves gas around the object to be cooled.

Even if a cooling device is installed in the driver's cab, since the driver's cab is open to the outside space, the cooled fluid will flow out to the outside of the industrial vehicle, and the industrial vehicle will be operated. The cooling effect on the room is small. Therefore, the driver's cab 10 of the industrial vehicle 1 of the present embodiment is not provided with a cooling device for generating a cooled fluid. The industrial vehicle 1 is not limited to the driver's cab 10, and does not include a cooling device that generates a cooled fluid for cooling each part of the industrial vehicle 1.

Therefore, the industrial vehicle 1 does not have a cooling device that produces a cooled fluid for cooling the power storage device 21 of the battery pack 20. That is, the industrial vehicle 1 cannot cool the power storage device 21 of the battery pack 20 by using the cooling device provided in the vehicle to generate the cooled fluid. Since the power storage device 21 of the industrial vehicle 1, which can reach a high temperature, is cooled by the operation of the supply unit 30 (an example of the supply device) described later, the industrial vehicle 1 is not loaded with the cooling device. It can operate properly.

At the front of the cab 10, a lift operating lever 11 for operating the lift cylinder 4 to raise and lower the fork 6 and a tilt operating lever 12 for operating the tilt cylinder 9 to tilt the mast 3 are provided. Has been done.

Further, a steering wheel 13 for steering is provided in the front portion of the driver's cab 10. The steering 13 is a hydraulic power steering, and it is possible to assist the driver's steering by a PS cylinder as a hydraulic cylinder for power steering (PS). The steering 13 is operated by, for example, an electric motor (power steering motor) (not shown). The power steering motor is operated by electric power from the power storage device 21 in the battery pack 20. Although not particularly shown, the driver's cab 10 is provided with a direction switch for switching the traveling direction (forward / reverse / neutral) of the industrial vehicle 1. The industrial vehicle 1 travels by driving the drive wheels by an electric motor (traveling motor) (not shown).

FIG. 2 is a block diagram showing a supply system according to the first embodiment of the present invention. The supply system 100 of the present embodiment includes an industrial vehicle 1, a supply unit 30 (an example of a supply machine), and a first cooling source 40. In the supply system 100, the supply unit 30 has a function of rapidly charging the power storage device 21 of the industrial vehicle 1 and cooling the power storage device 21.

The industrial vehicle 1 includes a battery pack 20. The battery pack 20 is, for example, a housing. The battery pack 20 includes a power storage device 21, a first heat exchanger 22, a temperature measuring unit 23, a connecting unit 24, and a control unit 25. The control unit 25 may be provided inside the industrial vehicle 1 and outside the battery pack 20. The battery pack 20 includes a medium flow path M20 through which the first cooling medium flows, a first three-way valve 27 (an example of a switching valve), and fans 26 and 28.

The medium flow path M20 has a first flow path M21, a second flow path M22, and a third flow path M23. The first flow path M21 is a flow path through which an external medium supplied from the outside of the industrial vehicle 1 to the inside of the industrial vehicle 1 can be distributed. One end of the first flow path M21 protrudes to the outside of the industrial vehicle 1, for example. The external medium is, for example, a gas (outside air) outside the industrial vehicle 1. The second flow path M22 is a flow path through which the first cooling medium can flow from the cooling unit 33, which will be described later. The first cooling medium is, for example, a gas or a liquid having a lower temperature than the external medium. The first cooling medium is, for example, compressed air in factory equipment.

The third flow path M23 is provided to connect the first flow path M21 and the second flow path M22 and to cool the power storage device 21. The third flow path M23 is connected to the first flow path M21 and the second flow path M22 via a first three-way valve 27 at one end thereof. The other end of the third flow path M23 projects to the outside of the industrial vehicle 1, for example. A part of the third flow path M23 is arranged in the first heat exchanger 22.

The first three-way valve 27 is connected to the first flow path M21, the second flow path M22, and the third flow path M23, respectively, and either the external medium or the first cooling medium flows through the third flow path M23. Switch to. The first three-way valve 27 is provided at a branch point of the first flow path M21, the second flow path M22, and the third flow path M23. The first three-way valve 27 opens and closes the valve based on the control of the control unit 25.

In the first three-way valve 27, when an external medium is circulated from the first flow path M21 to the third flow path M23, the first flow path M21 and the third flow path M23 communicate with each other and the second flow path M23. The valve is opened and closed so that the path M22 and the third flow path M23 do not communicate with each other. In the first three-way valve 27, when the first cooling medium is circulated from the second flow path M22 to the third flow path M23, the second flow path M22 and the third flow path M23 communicate with each other, and the first three-way valve 27 communicates with the third flow path M23. The valve is opened and closed so that the 1st flow path M21 and the 3rd flow path M23 do not communicate with each other. The first three-way valve 27 is not limited to the three-way valve as long as it has the above-mentioned function, and may be another valve.

The fan 26 is provided in the first flow path M21. The fan 26 rotates to allow an external medium to flow into the first flow path M21 from the outside. The fan 28 is provided in the third flow path M23. The fan 28 rotates to cause the external medium or the first cooling medium that has passed through the first heat exchanger 22 to flow out of the third flow path M23. The industrial vehicle 1 may be provided with only the fan 28, and may not be provided with the fan 26.

The power storage device 21 is a secondary battery that can be charged and discharged. The power storage device 21 is, for example, a lithium ion battery. The power storage device 21 is a power source for each part of the industrial vehicle 1. The power storage device 21 operates the lift cylinder 4, tilt cylinder 9 or steering 13 shown in FIG. 1, for example, by discharging toward an electric motor (not shown). The power storage device 21 is electrically connected to an electric motor (not shown).

The first heat exchanger 22 exchanges heat between the power storage device 21 and an external medium or a first cooling medium supplied from the outside of the industrial vehicle 1. The first heat exchanger 22 is adjacent to, for example, the power storage device 21. The first heat exchanger 22 arranges, for example, the third flow path M23 adjacent to the power storage device 21. The temperature of the external medium flowing through the third flow path M23 or the temperature of the first cooling medium flowing through the third flow path M23 is lower than the temperature of the power storage device 21. The external medium or the first cooling medium circulating in the third flow path M23 arranged in the first heat exchanger 22 cools the power storage device 21 by exchanging heat with the power storage device 21. The external medium or the first cooling medium whose temperature has risen from the time when it flows into the first heat exchanger 22 by exchanging heat with the power storage device 21 flows through the third flow path M23 and is outside the first heat exchanger 22. It is distributed to.

The temperature measuring unit 23 measures the temperature of the power storage device 21. The temperature measuring unit 23 is, for example, a temperature sensor. The temperature measuring unit 23 is connected to the power storage device 21. The temperature measuring unit 23 is communicably connected to the control unit 25. The temperature measuring unit 23 measures the temperature of the power storage device 21 based on the control of the control unit 25, for example.

The connection unit 24 is a portion of the battery pack 20 that connects to the supply unit 30. The connection portion 24 is, for example, an outlet. The connecting portion 24 exhibits, for example, a rectangular parallelepiped shape. At least one outer surface 24a of the connection portion 24 is exposed to the outside from the battery pack 20. The connection unit 24 is connected to the power storage device 21 via the electric cable E20. The connection unit 24 is connected to the control unit 25 via the control cable C20. The connecting portion 24 is provided with a fluid coupler. The connecting portion 24 is connected to the second flow path M22. One end of the second flow path M22 is connected to the fluid coupler in the connecting portion 24. Each end of the electric cable E20, the control cable C20, and the second flow path M22 is exposed on the outer surface 24a of the connection portion 24 so as to be connectable to the cable and the flow path of the supply section 30 described later.

The control unit 25 controls processing related to charging and cooling of the battery pack 20. The control unit 25 includes a processor, a memory, a storage, and the like, and is configured as a general computer. The processor is an arithmetic unit such as a CPU (Central Processing Unit). The memory is a storage medium such as a ROM (Read Only Memory) or a RAM (Random Access Memory). The storage is a storage medium such as an HDD (Hard Disk Drive). The control unit 25 monitors, for example, the state of the industrial vehicle 1. Through the control cable C20, the control unit 25 recognizes whether or not it is connected to the supply unit 30. Details will be described later. The control unit 25 is communicably connected to the power storage device 21, the temperature measurement unit 23, the fans 26, 28, and the first three-way valve 27.

The control unit 25 acquires the storage information, which is the information regarding the state of the power storage device 21, from the power storage device 21. The storage information includes, for example, a rechargeable power capacity. The rechargeable power capacity is a value obtained by subtracting the remaining amount (remaining battery amount) of the power storage device 21 from the total power capacity (discharge capacity) of the power storage device 21. The power storage information does not include the rechargeable power capacity, but may include the entire power capacity of the power storage device 21 and the remaining amount of the power storage device 21. In this case, the control unit 25 may calculate the chargeable power capacity.

The control unit 25 transmits a signal instructing the temperature measurement unit 23 to measure the temperature of the power storage device 21. When the signal is received, the temperature measuring unit 23 measures the temperature based on the instruction indicated by the signal. The control unit 25 acquires the temperature of the power storage device 21 measured by the temperature measurement unit 23.

The control unit 25 generates temperature information, which is information about the temperature of the power storage device 21, based on the acquired temperature of the power storage device 21. The temperature information includes, for example, the temperature of the power storage device 21, the temperature rise rate of the power storage device 21, and the lower limit temperature and the upper limit temperature at which the power storage device 21 can operate. The lower limit temperature is set to, for example, a temperature of 10 ° C. or lower. The temperature rise rate is calculated as, for example, a changed temperature per unit time. The upper limit temperature is set to, for example, a temperature of 40 ° C. or higher. The control unit 25 transmits, for example, a signal instructing the temperature measuring unit 23 to measure the temperature of the power storage device 21 at predetermined time intervals.

The control unit 25 controls the opening and closing of the first three-way valve 27. The control unit 25 transmits a signal instructing the first three-way valve 27 to switch the medium of either the external medium or the first cooling medium to circulate in the third flow path M23. When the signal is received, the first three-way valve 27 opens and closes the valve based on the instruction indicated by the signal. The control unit 25 acquires the first opening / closing information, which is information regarding the opening / closing state of the valve, from the first three-way valve 27. The first opening / closing information is, for example, information on whether or not the valve switching of the first three-way valve 27 is completed, or whether the first flow path M21 or the second flow path M22 is relative to the third flow path M23. Includes information indicating whether communication is in progress.

The control unit 25 controls the rotation of the fans 26 and 28 based on the first open / close information. The control unit 25 rotates the fans 26 and 28 when the first flow path M21 and the third flow path M23 communicate with each other. The control unit 25 stops the rotation of the fans 26 and 28 when the second flow path M22 and the third flow path M23 communicate with each other.

The control unit 25 controls the charging and discharging of the power storage device 21 together with the supply unit 30 via the connection unit 24. The control unit 25 transmits a signal representing vehicle information, which is information on the state of the industrial vehicle 1, to the supply unit 30 via the control cable C20. The vehicle information includes, for example, storage information, temperature information, and first opening / closing information. The vehicle information includes, for example, planning information input by a driver or the like. The plan information includes a scheduled time, which is a time during which charging of the power storage device 21 can be executed before the operation of the industrial vehicle 1.

The supply unit 30 supplies electric power to the power storage device 21 included in the battery pack 20 of the industrial vehicle 1 and supplies the first cooling medium to the medium flow path M20. The supply unit 30 includes a charger 31 and a charging plug 35 (an example of an input unit). The charger 31 is a device that is connected to the charging plug 35 and can supply electric power and a first cooling medium to the charging plug 35. The charger 31 is configured, for example, by accommodating each component in a housing. The charger 31 has a charging unit 32, a cooling unit 33, and a supply control unit 34. At least one of the charging unit 32, the cooling unit 33, and the supply control unit 34 may be arranged outside the charger 31. For example, the supply control unit 34 may control a plurality of chargers 31.

The charging unit 32 supplies electric power to the power storage device 21 of the industrial vehicle 1. The charging unit 32 supplies electric power to the power storage device 21 based on the instruction of the supply control unit 34. The charging unit 32 may supply electric power from, for example, an external power source of the charger 31. The charging unit 32 includes, for example, an AC / DC converter (not shown). The charging unit 32 converts the AC power of the power source into DC power by the AC / DC converter and transmits the AC power. The charging unit 32 can change the power value supplied to the power storage device 21 according to the control of the supply control unit 34. The charging unit 32 carries out rapid charging that supplies a large amount of power when charging is completed in a short time in the power storage device 21. The charging unit 32 suppresses the temperature rise of the power storage device 21 and performs normal charging to supply a small amount of power when charging does not have to be completed in a short time.

The cooling unit 33 supplies the first cooling medium to the second flow path M22. The cooling unit 33 is connected to a first cooling source 40 provided outside the supply unit 30. For example, the cooling unit 33 acquires the first cooling medium from the first cooling source 40 and supplies it to the second flow path M22 based on the instruction of the supply control unit 34. The first cooling source 40 is, for example, a compressed air tank. The cooling unit 33 can change the flow rate of the first cooling medium supplied to the second flow path M22 according to the control of the supply control unit 34. When the charging unit 32 is performing rapid charging to the power storage device 21, the cooling unit 33 performs large-scale cooling that increases the flow rate of the first cooling medium. When the charging unit 32 normally charges the power storage device 21, the cooling unit 33 performs small-scale cooling that reduces the flow rate of the first cooling medium, or stops the supply of the first cooling medium. Perform either of these processes.

The charging plug 35 will be described before the description of the supply control unit 34 of the charger 31. The charging plug 35 is detachably attached to the connection portion 24 of the battery pack 20 of the industrial vehicle 1 when the power storage device 21 is charged. The charging plug 35 is, for example, an inlet. The charging plug 35 is provided outside the charger 31, for example, and is connected to the charger 31. The charging plug 35 is connected to the charging unit 32 of the charger 31 via the electric cable E30. The charging plug 35 is connected to the supply control unit 34 of the charger 31 via the control cable C30. The charging plug 35 is connected to the cooling unit 33 of the charger 31 via the first refrigerant flow path M31. The charging plug 35 is provided with a fluid coupler. The charging plug 35 is connected to one end of the first refrigerant flow path M31 via a fluid coupler.

In the charging plug 35, each end of the electric cable E30, the control cable C30, and the first refrigerant flow path M31 can be connected to each end of the electric cable E20, the control cable C20, and the second flow path M22 of the connection portion 24, respectively. It is exposed to. When the charging plug 35 is attached to the connection unit 24, the power storage device 21 of the battery pack 20 and the charging unit 32 of the supply unit 30 are electrically connected via the electric cable E20 and the electric cable E30. When the charging plug 35 is attached to the connection portion 24, the cooling portion 33 and the second flow path M22 are circulateably connected to the first cooling medium via the first refrigerant flow path M31 and the fluid coupler. When the charging plug 35 is attached to the connection unit 24, the control unit 25 of the battery pack 20 and the supply control unit 34 of the supply unit 30 are communicably connected via the control cable C20 and the control cable C30.

Returning to the description of the charger 31 again. The supply control unit 34 controls the charging unit 32 and the cooling unit 33 based on the vehicle information acquired from the control unit 25. The supply control unit 34 is connected to the charging unit 32 and the cooling unit 33 in the charger 31. Like the control unit 25, the supply control unit 34 is configured as a general computer. When the charging plug 35 is attached to the connection unit 24 as described above, the supply control unit 34 is communicably connected to the control unit 25 of the battery pack 20 via the control cable C20 and the control cable C30.

When the supply control unit 34 transmits a signal indicating that the charging plug 35 is connected to the connection unit 24 to the control unit 25 and receives a signal indicating that the signal has been received from the control unit 25, the charging plug It is determined that the 35 and the battery pack 20 (connection portion 24) are connected. When the supply control unit 34 cannot receive the signal from the control unit 25, it is determined that the charging plug 35 and the battery pack 20 (connection unit 24) are not connected. When the control unit 25 transmits a signal indicating that the charging plug 35 is connected to the connection unit 24 to the supply control unit 34, and receives a signal indicating that the signal has been received from the supply control unit 34. , It may be determined that the charging plug 35 and the battery pack 20 are connected. When the supply control unit 34 determines that the charging plug 35 and the battery pack 20 are connected, the supply control unit 34 acquires vehicle information from the control unit 25.

The supply control unit 34 controls power transmission to the power storage device 21 in the charging unit 32 based on the vehicle information. The supply control unit 34 controls the charging unit 32 to transmit power to the power storage device 21 via the electric cable E20 and the electric cable E30. The supply control unit 34 controls the power value supplied from the charging unit 32, for example, based on the electricity storage information and the planning information included in the vehicle information.

For example, when the chargeable power capacity in the electricity storage information is larger than the predetermined power threshold value, or when the scheduled time is less than the predetermined time threshold value in the plan information, the supply control unit 34 causes the charging unit 32 to perform quick charging. .. When the chargeable power capacity in the electricity storage information is smaller than the power threshold value, or when the scheduled time is equal to or longer than the predetermined time threshold value in the plan information, the supply control unit 34 causes the charging unit 32 to perform normal charging. The time threshold value is, for example, the time until the power storage device 21 completes charging when the charging unit 32 performs normal charging. For example, the supply control unit 34 calculates the time threshold value based on the vehicle information before the above determination. The supply control unit 34 acquires charge type information, which is information on whether the charging unit 32 is performing quick charging or normal charging.

The supply control unit 34 controls the flow rate of the first cooling medium supplied from the cooling unit 33 based on the vehicle information and the charge type information. The supply control unit 34 controls the flow rate based on, for example, the temperature information included in the vehicle information and the first opening / closing information. The supply control unit 34 controls the cooling unit 33 to acquire the first cooling medium from the first cooling source 40, and also controls the first cooling medium to the second flow path M22 via the first refrigerant flow path M31. Is controlled to supply. For example, when the cooling unit 33 acquires the first cooling medium from the first cooling source 40, the supply control unit 34 receives the first cooling signal which is a signal indicating that the first cooling medium has been acquired from the cooling unit 33. do.

For example, the information indicated by the charge type information is quick charging, the temperature rise rate of the power storage device 21 is larger than a predetermined threshold value in the temperature information, and the second flow path M22 and the third flow path are in the first opening / closing information. When communicating with M23, the supply control unit 34 supplies the first cooling medium to the second flow path M22 by a predetermined flow rate in the cooling unit 33 after receiving the first cooling signal. The supply control unit 34 may add that the temperature of the power storage device 21 is larger than the lower limit temperature as a condition for supplying the first cooling medium to the second flow path M22 by a predetermined flow rate in the cooling unit 33. Further, in addition to the condition that the difference between the temperature of the power storage device 21 and the temperature of the external medium is smaller than a predetermined threshold value, the cooling unit 33 supplies the first cooling medium to the second flow path M22 by a predetermined flow rate. You may. Further, even if the information indicated by the charge type information is normal charging, the supply control unit 34 may supply the first cooling medium to the second flow path M22 by a predetermined flow rate in the cooling unit 33.

For example, when the temperature rise rate of the power storage device 21 is not more than the threshold value in the temperature information, when the temperature of the power storage device 21 is not more than the lower limit temperature, or in the first opening / closing information, the first flow path M21 and the third flow path M23 are In the case of communication, the supply control unit 34 sets the flow rate of the first cooling medium supplied to the second flow path M22 in the cooling unit 33 to 0, and stops the supply of the first cooling medium.

Next, a supply method for charging and cooling the power storage device 21 of the industrial vehicle 1 by using the supply system 100 will be described. FIG. 3 is a flowchart showing the processing contents of the supply system according to the first embodiment of the present invention. For example, the flowchart of the supply method shown in FIG. 3 is started when there is a chargeable electric power capacity in the electricity storage information of the industrial vehicle 1 and the connection portion 24 and the charging plug 35 are connected. When the connection unit 24 and the charging plug 35 are not connected, for example, the control unit 25 and the supply control unit 34 cool the power storage device 21 by distributing an external medium to the third flow path M23.

In the supply method, first, the supply control unit 34 acquires vehicle information (step S11). The supply control unit 34 acquires vehicle information from the control unit 25 via the control cable C20 and the control cable C30.

Subsequently, the supply control unit 34 determines whether to cause the charging unit 32 to perform quick charging (step S13). When the chargeable power capacity in the electricity storage information is larger than the predetermined power threshold value, or when the scheduled time is less than the predetermined time threshold value in the plan information, the supply control unit 34 determines that the charging unit 32 is to perform quick charging. (Step S13: YES). In this case, the process proceeds to the rate of increase determination process (step S15) described later. When the chargeable power capacity in the electricity storage information is smaller than the power threshold value, or when the scheduled time is equal to or longer than the predetermined time threshold value in the plan information, the supply control unit 34 does not cause the charging unit 32 to perform rapid charging, and normally charges the battery. (Step S13: NO). In this case, the process proceeds to the first three-way valve control process (step S19) described later.

Subsequently, when it is determined in the quick charge determination process (step S13) that the quick charge is to be performed (step S13: YES), whether or not the temperature rise rate of the power storage device 21 is larger than a predetermined threshold value in the supply control unit 34. Is determined (step S15). When the supply control unit 34 determines that the temperature rise rate of the power storage device 21 is larger than a predetermined threshold value based on the temperature information (step S15: YES), the process proceeds to the lower limit temperature determination process (step S17). When the supply control unit 34 determines that the temperature rise rate of the power storage device 21 is equal to or less than a predetermined threshold value based on the temperature information (step S15: NO), the process proceeds to the first three-way valve control process (step S19).

Subsequently, when it is determined in the increase rate determination process (step S15) that the temperature increase rate of the power storage device 21 is larger than a predetermined threshold value (step S15: YES), the temperature of the power storage device 21 is the lower limit temperature in the supply control unit 34. Whether or not it is larger is determined (step S17). When the supply control unit 34 determines that the temperature of the power storage device 21 is larger than the lower limit temperature based on the temperature information (step S17: YES), the process proceeds to the second three-way valve control process (step S23). When the supply control unit 34 determines that the temperature of the power storage device 21 is equal to or lower than the lower limit temperature based on the temperature information (step S17: NO), the process proceeds to the first three-way valve control process (step S19).

Subsequently, when quick charging is not performed in the quick charge determination process (step S13) (step S13: NO), when the temperature increase rate of the power storage device 21 is equal to or less than a predetermined threshold value in the increase rate determination process (step S15) (step S13). When the temperature of the power storage device 21 is equal to or lower than the lower limit temperature in step S15: NO) and the lower limit temperature determination process (S17) (step S17: NO), the control unit 25 and the supply control unit 34 open and close the first three-way valve 27. Is controlled (step S19). The supply control unit 34 transmits a signal instructing the control unit 25 to communicate the first flow path M21 and the third flow path M23 to the control unit 25.

The control unit 25 that has received the signal controls the opening and closing of the first three-way valve 27. As a result, the first flow path M21 and the third flow path M23 communicate with each other. The control unit 25 controls the opening and closing of the first three-way valve 27 so that the space between the second flow path M22 and the third flow path M23 does not communicate with each other. The control unit 25 acquires the first opening / closing information indicating that the first flow path M21 and the third flow path M23 communicate with each other from the first three-way valve 27. In the first open / close information acquired by the supply control unit 34 in the acquisition process (step S11), when the first flow path M21 and the third flow path M23 are already in communication, the supply control unit 34 is the first. It is not necessary to execute the three-way valve control process (step S19).

Subsequently, after the control unit 25 recognizes that the first flow path M21 and the third flow path M23 communicate with each other based on the first open / close information, the power storage device from the charging unit 32 as normal charging under the control of the supply control unit 34. Power is supplied to 21 and an external medium is circulated from the first flow path M21 to the third flow path M23 under the control of the control unit 25 (step S21). When the control unit 25 rotates the fan 26, the external medium flows in from the outside of the industrial vehicle 1. As the fans 26 and 28 rotate, the external medium flows from the first flow path M21 toward the third flow path M23. Since the external medium flowing into the third flow path M23 flows through the first heat exchanger 22, heat exchange with the power storage device 21 in the first heat exchanger 22. As the fan 28 rotates, the external medium flows through the third flow path M23 and is discharged to the outside of the industrial vehicle 1 from the end of the third flow path M23.

Subsequently, when quick charging is performed in the quick charge determination process (step S13) (step S13: YES), when the temperature increase rate of the power storage device 21 is larger than a predetermined threshold value in the increase rate determination process (step S15) (step). When the temperature of the power storage device 21 is larger than the lower limit temperature in S15: YES) and the lower limit temperature determination process (S17) (step S17: YES), the control unit 25 and the supply control unit 34 control the opening and closing of the first three-way valve 27. Is performed (step S23). The supply control unit 34 transmits a signal instructing the control unit 25 to communicate the second flow path M22 and the third flow path M23 to the control unit 25.

The control unit 25 that has received the signal controls the opening and closing of the first three-way valve 27. As a result, the second flow path M22 and the third flow path M23 communicate with each other. The control unit 25 controls the opening and closing of the first three-way valve 27 so that the space between the first flow path M21 and the third flow path M23 does not communicate with each other. The control unit 25 acquires the first opening / closing information indicating that the second flow path M22 and the third flow path M23 communicate with each other from the first three-way valve 27. When the second flow path M22 and the third flow path M23 are already in communication with each other in the first open / close information acquired by the supply control unit 34 in the acquisition process (step S11), the supply control unit 34 is the second. It is not necessary to execute the three-way valve control process (step S23).

Subsequently, after the control unit 25 recognizes that the second flow path M22 and the third flow path M23 are in communication with each other based on the first open / close information, the power storage device from the charging unit 32 as a quick charge under the control of the supply control unit 34. Electric power is supplied to 21, and the first cooling medium is circulated toward the battery pack 20 by the cooling unit 33 and the supply control unit 34 (step S25). The supply control unit 34 controls the cooling unit 33 so that the cooling unit 33 acquires the first cooling medium from the first cooling source 40. When the supply control unit 34 receives the first cooling signal from the cooling unit 33, the supply control unit 34 is directed by the cooling unit 33 from the first refrigerant flow path M31 toward the second flow path M22 and the third flow path M23. The first cooling medium is circulated. Since the first cooling medium flowing into the third flow path M23 flows through the first heat exchanger 22, heat exchange with the power storage device 21 in the first heat exchanger 22. For example, when the control unit 25 rotates the fan 28, the first cooling medium circulates through the first heat exchanger 22 and the third flow path M23, and is outside the industrial vehicle 1 from the end of the third flow path M23. Is discharged to.

Subsequently, after the supply control unit 34 executes the external medium distribution process (step S21) or the cooling medium distribution process (step S25), it is determined whether or not the charging is completed after a predetermined time (step S27). .. The supply control unit 34 acquires vehicle information via the control unit 25. When the chargeable power capacity of the electricity storage information included in the vehicle information is 0 or less than a predetermined threshold value, the supply control unit 34 determines that the charging of the electricity storage device 21 of the industrial vehicle 1 is completed. If the supply control unit 34 does not determine that charging is complete (step S27: NO), the supply control unit 34 again executes a series of processes from the acquisition process (S11).

When the supply control unit 34 determines that charging is completed (step S27: YES), the supply control unit 34 ends the charging process and the cooling process for the power storage device 21 by the charger 31. The supply control unit 34, for example, stops the supply of electric power to the power storage device 21 by the charging unit 32. The supply control unit 34, for example, stops the acquisition of the first cooling medium from the first cooling source 40 by the cooling unit 33. By each process of the above supply method, the supply system 100 can appropriately perform the charge process and the cooling process on the power storage device 21 of the industrial vehicle 1.

As described above, the supply system 100, the industrial vehicle 1 and the supply unit 30 of the present embodiment can alleviate the temperature rise during rapid charging without providing the industrial vehicle 1 with a cooling device for generating a cooled fluid. can. In the supply system 100, the charging unit 32 of the supply unit 30 supplies power to the power storage device 21 of the industrial vehicle 1, and the cooling unit 33 of the supply unit 30 supplies the first cooling medium to the medium flow path M20 of the industrial vehicle 1. Let me. As a result, the medium flow path M20 can distribute the first cooling medium capable of cooling the power storage device 21 to the first heat exchanger 22, and can lower the temperature of the power storage device 21.

Further, by switching the first three-way valve 27, either the external medium or the first cooling medium flows through the third flow path M23. Therefore, for example, an appropriate medium having a high degree of contribution to heat exchange in the power storage device 21 can be circulated in the third flow path M23. After switching the medium to be circulated in the third flow path M23 by the first three-way valve 27 from the external medium to the first cooling medium, the temperature of the external medium is kept flowing by continuing to flow the first cooling medium into the third flow path M23. The cooling effect due to the temperature of the first cooling medium can be sufficiently given to the power storage device 21 while suppressing the influence of the above. Therefore, by appropriately switching the first three-way valve 27, a medium suitable for heat exchange in the power storage device 21 can be circulated in the third flow path M23.

Further, since the first three-way valve 27 switches based on the temperature of the power storage device 21, for example, an appropriate medium among the external medium and the first cooling medium can be circulated in the third flow path M23. Therefore, the control unit 25 can appropriately switch the first three-way valve 27 based on the temperature of the power storage device 21 to distribute a medium suitable for heat exchange in the first heat exchanger 22 to the third flow path M23. can.

The cooling unit 33 can supply the first cooling medium supplied from the first cooling source 40 to the medium flow path M20. In this case, the supply control unit 34 can supply the first cooling medium from the first cooling source 40 to the medium flow path M20 via the cooling unit 33. Further, the cooling unit 33 can acquire the first cooling medium having a lower temperature than the external medium from the first cooling source 40. Therefore, the cooling performance of the power storage device 21 can be appropriately ensured.

Generally, as a cooling method of a power storage device of a battery pack, the fluid supplied from the cooling device is used by using a cooling device (air conditioning device) that generates a cooled fluid for the driver's cab of the vehicle and supplies the fluid. As an example, there is a method of distributing the fluid around the battery. Here, in the industrial vehicle 1, which is an example of many industrial vehicles, the driver's cab 10 is open to the outside unlike a general vehicle. Therefore, even if a cooling device for generating a cooled fluid is provided in the industrial vehicle, the cooled fluid will flow out to the outside of the industrial vehicle, and the cooling of the cab of the industrial vehicle will be performed. The effect is small. Therefore, the industrial vehicle 1 of the present embodiment is not equipped with a cooling device that generates a cooled fluid for the driver's cab 10. Therefore, it is difficult to apply the general cooling method.

Even if the industrial vehicle is provided with a cooling device that generates a cooled fluid in order to cool the power storage device of the battery pack, the cooling device is effectively used only when the power storage device is rapidly charged. Therefore, the cooling device can increase the weight and power consumption of the industrial vehicle. Therefore, an industrial vehicle not equipped with the cooling device can be more efficient in terms of operation of the industrial vehicle than an industrial vehicle equipped with the cooling device. Therefore, in the cooling system of the battery of the industrial vehicle. There is room for improvement. In particular, there has been a demand for a system capable of alleviating a temperature rise during rapid charging without providing a cooling device for generating a cooled fluid in an industrial vehicle. Here, the industrial vehicle 1 of the present embodiment can alleviate the temperature rise during rapid charging by the supply system 100 and the supply unit 30 without providing a cooling device that generates a cooled fluid.

Further, when charging and cooling the power storage devices 21 of the plurality of industrial vehicles 1, the supply unit 30 is compared with the case where the cooling devices for generating the cooled fluid provided in each industrial vehicle are used for cooling. By providing the cooling unit 33, it is possible to suppress the power consumption of each power storage device 21 by the cooling device during the charging process, so that power can be efficiently supplied to each power storage device 21.

Further, since the external medium can flow through the third flow path M23 and flow into the inside of the first heat exchanger 22, the external medium and the power storage device 21 can directly exchange heat. Unlike the third flow path M23, the flow path through which the predetermined medium for heat exchange with the power storage device flows and the flow path through which the external medium flows are not shared, and the predetermined flow path is between two different flow paths. In the battery pack 20 of the present embodiment, the arrangement of the flow paths can be simplified and the cost related to the installation can be suppressed as compared with the case where the medium and the external medium exchange heat.

Further, since the cooling process of the power storage device 21 using either the external medium or the first cooling medium can be selected based on the vehicle information of the industrial vehicle 1, the energy-efficient charging process and the cooling process are executed. can do.

Further, the environment in which many industrial vehicles 1 operate is, for example, a factory. In the supply system 100, a compressed air tank deployed as an infrastructure in many factories can be used as the first cooling source 40. The cooling unit 33 can supply the compressed air supplied from the first cooling source 40 to the medium flow path M20 as the first cooling medium. Therefore, the supply system 100 can effectively utilize the existing infrastructure in the operating environment of the industrial vehicle 1 and appropriately cool the power storage device 21.

[Second Embodiment]
Next, the supply system according to the second embodiment will be described. The supply system according to the second embodiment includes a flow path, a cooling unit, and a cooling source different from those of the supply system 100 according to the first embodiment. The configuration in which the same numbers described in the first embodiment are assigned to the names described in the first embodiment has the same configurations and functions as those in the first embodiment in the second embodiment. The same number as described in the first embodiment is added to the name described in the first embodiment, and the newly coded configuration has the same configuration and function as the first embodiment in the second embodiment. Have some. In the following description, the description overlapping with the first embodiment will be omitted as appropriate.

FIG. 4 is a block diagram showing a supply system according to a second embodiment of the present invention. As shown in FIG. 4, the supply system 100A of the present embodiment includes an industrial vehicle 1A, a supply unit 30A (an example of a supply machine), and a second cooling source 50. In the supply system 100A, the supply unit 30A has a function of rapidly charging the power storage device 21 of the industrial vehicle 1 and cooling the power storage device 21.

The industrial vehicle 1A includes a battery pack 20A. The battery pack 20A includes a power storage device 21, a first heat exchanger 22, a temperature measuring unit 23, a connecting unit 24A, and a control unit 25A. The battery pack 20A includes a medium flow path M20 through which the first cooling medium flows, a first three-way valve 27 (an example of a switching valve), a second three-way valve 29, and fans 26 and 28A.

The medium flow path M20 has a first flow path M21, a second flow path M22, a third flow path M23, a fourth flow path M24, and a fifth flow path M25. The second flow path M22 is a flow path through which the first cooling medium can flow from the cooling unit 33A, which will be described later.

One end of the third flow path M23 is connected to the first flow path M21 and the second flow path M22 via the first three-way valve 27. The other end of the third flow path M23 is connected to the fourth flow path M24 and the fifth flow path M25 via the second three-way valve 29. The third flow path M23 is provided to cool the power storage device 21. A part of the third flow path M23 is arranged in the first heat exchanger 22.

The fourth flow path M24 is a flow path through which an external medium can flow from the second three-way valve 29. One end of the fourth flow path M24 protrudes to the outside of the industrial vehicle 1, for example. The fifth flow path M25 is a flow path through which the first cooling medium can flow from the second three-way valve 29 toward the cooling unit 33A described later. By opening and closing the first three-way valve 27 and the second three-way valve 29, the internal flow paths of the second flow path M22, the third flow path M23, the fifth flow path M25, and the supply unit 30A described later become the first heat exchanger. A closed flow path can be formed between 22 and the cooling unit 33A.

The second three-way valve 29 connects to the third flow path M23, the fourth flow path M24, and the fifth flow path M25, respectively, and depending on the medium flowing through the third flow path M23, the fourth flow path M24 or the fifth flow path M24. The flow path of any of the paths M25 and the third flow path M23 are switched so as to communicate with each other. The second three-way valve 29 is provided at a branch point of the third flow path M23, the fourth flow path M24, and the fifth flow path M25. The second three-way valve 29 opens and closes the valve based on the control of the control unit 25.

In the second three-way valve 29, when an external medium is circulated from the third flow path M23 to the fourth flow path M24, the third flow path M23 and the fourth flow path M24 communicate with each other and the third flow path M24. The valve is opened and closed so that the path M23 and the fifth flow path M25 do not communicate with each other. In the second three-way valve 29, when the first cooling medium is circulated from the third flow path M23 to the fifth flow path M25, the third flow path M23 and the fifth flow path M25 communicate with each other, and the second three-way valve 29 communicates with the fifth flow path M25. The valve is opened and closed so that the inside of the 3 flow path M23 and the 5th flow path M25 do not communicate with each other.

The second flow path M22 and the fifth flow path M25 are each connected to the connection portion 24A. One end of the fifth flow path M25 is connected to the fluid coupler in the connecting portion 24. Each end of the electric cable E20, the control cable C20, the second flow path M22, and the fifth flow path M25 is exposed on the outer surface 24a of the connection part 24 so as to be connectable to the cable and the flow path of the supply part 30A.

The control unit 25 is communicably connected to the power storage device 21, the temperature measurement unit 23, the fans 26, 28A, the first three-way valve 27, and the second three-way valve 29. The control unit 25 controls the opening and closing of the second three-way valve 29. The control unit 25 instructs to switch so that the flow path of either the fourth flow path M24 or the fifth flow path M25 and the third flow path M23 communicate with each other according to the medium flowing through the third flow path M23. Send a signal. When the second three-way valve 29 receives the signal, the second three-way valve 29 opens and closes the valve based on the instruction indicated by the signal.

The control unit 25 acquires the second opening / closing information, which is the information regarding the opening / closing state of the valve, from the second three-way valve 29. The second opening / closing information is, for example, information on whether or not the valve switching of the second three-way valve 29 is completed, or whether the fourth flow path M24 or the fifth flow path M25 is relative to the third flow path M23. Includes information indicating whether communication is in progress.

The control unit 25 controls the rotation of the fan 28A based on the second open / close information. The fan 28A is provided in the fourth flow path M24. The fan 28A rotates to cause the external medium that has passed through the first heat exchanger 22 to flow out from the inside of the third flow path M23 and the inside of the fourth flow path M24. The control unit 25 rotates the fan 28A when the third flow path M23 and the fourth flow path M24 communicate with each other. The control unit 25 stops the rotation of the fan 28A when the third flow path M23 and the fifth flow path M25 communicate with each other.

The supply unit 30A supplies electric power to the power storage device 21 included in the battery pack 20A of the industrial vehicle 1 and supplies a first cooling medium to the power storage device 21. The charging plug 35 is connected to the cooling unit 33A via the first refrigerant flow path M31 and the second refrigerant flow path M32. The charging plug 35A is connected to one end of the first refrigerant flow path M31 and one end of the second refrigerant flow path M32 via a fluid coupler. When the charging plug 35A is connected to the connection portion 24, the second refrigerant flow path M32 is connected to the fifth flow path M25 via a fluid coupler.

The cooling unit 33A has a pump function. When the third flow path M23 and the fifth flow path M25 communicate with each other by switching the second three-way valve 29, the first cooling medium flows from the third flow path M23 into the fifth flow path M25. The first cooling medium flows through the fifth flow path M25 and flows into the second refrigerant flow path M32.

The cooling unit 33A has a second heat exchanger 36 (an example of a heat exchanger) that cools the first cooling medium by the second cooling medium supplied from the second cooling source 50. The second cooling medium is, for example, a gas or a liquid having a lower temperature than the external medium and the first cooling medium. The second cooling medium is, for example, factory water. The second cooling source 50 is, for example, a factory water storage tank. The second cooling source 50 may be, for example, an external water source. A part of the second refrigerant flow path M32 is provided inside the second heat exchanger 36.

The second heat exchanger 36 includes a second cooling medium supplied from a second cooling source 50 provided outside the industrial vehicle 1 and a first cooling medium whose temperature has risen by exchanging heat with the power storage device 21. To exchange heat. The second heat exchanger 36 is connected to the second cooling source 50 by the supply flow path L50. A part of the supply flow path L50 is provided so as to pass through the inside of the second heat exchanger 36. One end of the supply flow path L50 is connected to the second cooling source 50, and the other end of the supply flow path L50 is provided outside the supply unit 30A. The second cooling medium flows from the second cooling source 50 through the supply flow path L50, flows inside the second heat exchanger 36, and is discharged outside the supply unit 30A.

In the second heat exchanger 36, for example, the second refrigerant flow path M32 and the supply flow path L50 are adjacent to each other. The first cooling medium flowing through the second refrigerant flow path M32 arranged in the second heat exchanger 36 is cooled by exchanging heat with the second cooling medium flowing through the supply flow path L50. The first cooling medium whose temperature has dropped due to heat exchange with the second cooling medium recirculates inside the first refrigerant flow path M31 communicating with the second refrigerant flow path M32, and flows into the second flow path M22 again. Inflow.

For example, the cooling unit 33A returns from the second refrigerant flow path M32 to the second heat exchanger 36, and returns to the first refrigerant flow path M31, the second refrigerant flow path M32, the second flow path M22, and the third flow path M23. And when the closed flow path formed by the fifth flow path M25 is filled with the first cooling medium having a flow rate equal to or higher than the threshold value, the cooling unit 33A enters the second flow path M22 via the first refrigerant flow path M31. Stop the supply of the first cooling medium in circulation. The cooling unit 33A may be connected to, for example, a cooling source similar to the first cooling source 40 of the first embodiment, and the above-mentioned flow path may be filled with the first cooling medium in advance.

The supply control unit 34 controls the flow rate of the first cooling medium and the flow rate of the second cooling medium supplied from the cooling unit 33A to the third flow path M23 based on the vehicle information and the charge type information. The supply control unit 34 controls the flow rate based on, for example, the temperature information, the first opening / closing information, and the second opening / closing information included in the vehicle information. The supply control unit 34 controls the cooling unit 33A to acquire the second cooling medium from the second cooling source 50, and also controls the first cooling medium to the second flow path M22 via the first refrigerant flow path M31. Is controlled to supply. For example, when the cooling unit 33A circulates the second cooling medium from the second cooling source 50 to the supply flow path L50, the supply control unit 34 acquires the second cooling medium from the second cooling source 50 by the cooling unit 33A. A second cooling signal, which is a signal indicating that, is received.

For example, the information indicated by the charge type information is quick charging, the temperature rise rate of the power storage device 21 is larger than a predetermined threshold value in the temperature information, and the opening / closing information includes the second flow path M22 and the third flow path M23. When the third flow path M23 and the fifth flow path M25 communicate with each other in the open / close information, the supply control unit 34 receives the second cooling signal and then causes the cooling unit 33A to communicate with each other. The first cooling medium is supplied to the first refrigerant flow path M31 by a predetermined flow rate. A first cooling medium having a flow rate equal to or higher than the threshold value is provided in a closed flow path formed by the first refrigerant flow path M31, the second refrigerant flow path M32, the second flow path M22, the third flow path M23, and the fifth flow path M25. When filled, the cooling unit 33A stops the supply of the first cooling medium flowing to the second flow path M22 via the first refrigerant flow path M31. If the above conditions are met after the supply is stopped, the cooling unit 33A may use the first refrigerant flow path M31, the second flow path M22, the third flow path M23, the fifth flow path M25, and the second refrigerant flow path M32. The first cooling medium is circulated in each flow path in the order of.

For example, when the temperature rise rate of the power storage device 21 is not more than the threshold value in the temperature information, when the temperature of the power storage device 21 is not more than the lower limit temperature, or in the first opening / closing information, the first flow path M21 and the third flow path M23 In the case of communication, the supply control unit 34 sets the flow rate of the first cooling medium supplied to the second flow path M22 in the cooling unit 33A to 0, and stops the supply and circulation of the first cooling medium. Further, when the third flow path M23 and the fourth flow path M24 communicate with each other in the second opening / closing information, the supply control unit 34 sends the flow rate of the first cooling medium supplied to the second flow path M22 in the cooling unit 33A. Is set to 0, and the supply and circulation of the first cooling medium are stopped. When any of the above conditions is met, the supply control unit 34 sets the flow rate of the second cooling medium acquired from the second cooling source 50 in the cooling unit 33A to 0, and stops the supply of the second cooling medium.

Next, a supply method for charging and cooling the power storage device 21 of the industrial vehicle 1 by using the supply system 100A will be described. FIG. 3 is a flowchart showing the processing contents of the supply system according to the second embodiment of the present invention. The same processing as the flowchart showing the processing contents of the supply system according to the first embodiment shown in FIG. 3 will be omitted as appropriate.

In the second embodiment, instead of controlling the first three-way valve 27 in the first three-way valve control process (step S19), the control unit 25 and the supply control unit 34 open and close the first three-way valve 27 and the second three-way valve 29. Control is performed (step S19A). In the second embodiment, instead of the external medium distribution process (step S21), the control unit 25 uses the first open / close information and the second open / close information to cause the first flow path M21, the third flow path M23, and the fourth flow path M24. After recognizing that the communication is performed, the external medium is circulated from the first flow path M21 by the control unit 25 (step S21A).

In the second embodiment, instead of controlling the first three-way valve 27 in the second three-way valve control process (step S23), the control unit 25 and the supply control unit 34 open and close the first three-way valve 27 and the second three-way valve 29. Control is performed (step S23A). In the second embodiment, instead of the cooling medium flow process (step S25), the control unit 25 uses the first open / close information and the second open / close information to cause the second flow path M22, the third flow path M23, and the fifth flow path M25. After recognizing that the communication is performed, the first cooling medium is circulated toward the battery pack 20 by the cooling unit 33A and the supply control unit 34 (step S25A).

As described above, the supply system 100A, the industrial vehicle 1A, and the supply unit 30A of the present embodiment can obtain the same operations and effects as the supply system 100 of the first embodiment. Further, the supply system 100A includes a second cooling source 50 that supplies a second cooling medium to the cooling unit 33A outside the industrial vehicle 1A, and the cooling unit 33A is a second cooling medium supplied from the second cooling source. A second heat exchanger 36 for cooling the first cooling medium is provided, and the first cooling medium is circulated between the medium flow path M20 and the second heat exchanger 36. In this case, the first cooling medium circulates in the medium flow path M20 and the second heat exchanger 36. The temperature of the first cooling medium is lowered by exchanging heat with the second cooling medium in the second heat exchanger 36. Therefore, since the first cooling medium is supplied to the industrial vehicle 1A in a state where the temperature is appropriately lowered in the second heat exchanger 36, the cooling performance for the power storage device 21 can be ensured. Since the supply system 100A, the industrial vehicle 1A, and the supply unit 30A can also be used during normal charging, the temperature rise during normal charging can be increased without providing a cooling device for generating the cooled fluid in the industrial vehicle 1A. It can also be relaxed.

In addition, many industrial vehicles 1A operate in factories. The supply system 100A can use the factory water deployed as the infrastructure in the factory as the second cooling source 50. At this time, the supply system 100A can appropriately cool the power storage device 21 by using the existing infrastructure in the operating environment of the industrial vehicle 1A.

[Modification example]
Although various exemplary embodiments have been described above, the present invention is not limited to the above-mentioned exemplary embodiments, and various omissions, substitutions, and modifications may be made. For example, the supply systems 100, 100A may have a temperature sensor that measures the temperature of the external medium and the first cooling medium. The supply systems 100 and 100A may allow the first cooling medium to flow through the third flow path M23 when the temperature of the first cooling medium is lower than the temperature of the external medium by a predetermined temperature. For example, the power storage device 21 and the first heat exchanger 22 do not have to be adjacent to each other. In this case, a circulation flow path and a pump capable of circulating the medium so as to circulate between the power storage device 21 and the first heat exchanger 22 may be provided.

Further, the battery pack 20 does not have to be provided with the control unit 25. At this time, by connecting the supply unit 30 to the industrial vehicle 1, the supply control unit 34 can communicate with the power storage device 21, the temperature measurement unit 23, the fan 26, and the first three-way valve 27 via the control cables C20 and C30. Connect to. The supply control unit 34 may directly control the power storage device 21, the temperature measurement unit 23, the fan 26, and the first three-way valve 27, or may directly acquire vehicle information from each unit. In this case, since it is not necessary to provide the control unit 25 in the battery pack 20, the arrangement in the battery pack 20 can be simplified and the cost related to the installation can be suppressed.

At least one of the first three-way valve 27 and the second three-way valve 29 may not be controlled by the control unit 25 or the supply control unit 34. In this case, at least one of the first three-way valve 27 and the second three-way valve 29 may be exposed to the outside of the battery pack 20 so that the three-way valve can be manually operated from the outside of the battery pack 20.

In the supply method, the quick charge determination process (step S13) may not be performed. At this time, even in the case of normal charging, the first three-way valve control process (steps S19, S19A) and the external medium distribution process (steps S21, S21A) are not executed, for example, based on the temperature of the power storage device 21. The first cooling medium can be circulated in the third flow path M23. At this time, since the supply system 100, the industrial vehicle 1, and the supply unit 30 can also be used during normal charging, the temperature rises during normal charging without providing the industrial vehicle 1 with a cooling device for generating a cooled fluid. Can also be alleviated. Further, when the quick charge determination process (step S13) is not executed, for example, the second three-way valve control process (steps S23, S23A) and the cooling medium distribution process (steps S25, S25A) are performed even in the case of quick charge. Instead of doing so, the external medium may be circulated to the third flow path M23.

Further, it is not necessary to execute at least one of the increase rate determination process (step S15) and the lower limit temperature determination process (step S17). When both the rise rate determination process (step S15) and the lower limit temperature determination process (step S17) are not executed, for example, after the connection unit 24 and the supply unit 30 are connected, a second three-way valve control process (step S23) is performed. , S23A). Further, it is not necessary to execute the charging completion determination process (step S27). For example, the supply method may be terminated when the external medium distribution process (steps S21, S21A) or the cooling medium distribution process (steps S25, S25A) is executed for a predetermined time. If the quick charge determination process (step S13), the rate of increase determination process (step S15), the lower limit temperature determination process (step S17), and the charge completion determination process (step S27) are not executed, the acquisition process (step S11) is executed. You don't have to.

In the second embodiment, before the second three-way valve opening / closing process (step S21A) is executed, the temperature of the second cooling medium is smaller than the temperature of the external medium, and the cooling unit 33A makes a predetermined flow rate of the first cooling medium. May be added to the determination condition when supplying only to the second flow path M22. At this time, if the temperature of the second cooling medium is not sufficiently lower than the temperature of the external medium, it is possible to prevent the temperature of the first cooling medium from being unable to be sufficiently lowered.

1,1A ... Industrial vehicle, 4 ... Lift cylinder, 9 ... Tilt cylinder, 10 ... Driver's cab, 13 ... Steering, 20,20A ... Battery pack, 21 ... Power storage device, 22 ... First heat exchanger, 23 ... Temperature measurement Unit, 24, 24A ... Connection unit, 25, 25A ... Control unit, 26 ... Fan, 27 ... First three-way valve, 28, 28A ... Fan, 29 ... Second three-way valve, 30, 30A ... Supply unit, 31 ... Charging Vessel, 32 ... Charging unit, 33, 33A ... Cooling unit, 34 ... Supply control unit, 35, 35A ... Charging plug, 36 ... Second heat exchanger, 40 ... First cooling source, 50 ... Second cooling source, 100 , 100A ... Supply system, C20, C30 ... Control cable, E20, E30 ... Electric cable, L50 ... Supply flow path, M20 ... Medium flow path, M21 ... First flow path, M22 ... Second flow path, M23 ... Third flow path Flow path, M24 ... 4th flow path, M25 ... 5th flow path, M31 ... 1st refrigerant flow path, M32 ... 2nd refrigerant flow path.

Claims (8)

With industrial vehicles
A supply unit provided outside the industrial vehicle and connected to the industrial vehicle,
Equipped with
The industrial vehicle is
Power storage device and
A medium flow path through which a first cooling medium for cooling the power storage device is circulated,
Have,
The supply unit
A charging unit that supplies electric power to the power storage device,
A cooling unit that supplies the first cooling medium to the medium flow path,
Has a supply system. The medium flow path is
The first flow path through which an external medium can be distributed,
A second flow path through which the first cooling medium can flow from the cooling unit,
A third flow path that is connected to the first flow path and the second flow path and is provided for cooling the power storage device, and a third flow path.
It is connected to each of the first flow path, the second flow path, and the third flow path, and is switched so that either the external medium or the first cooling medium flows through the third flow path. The supply system of claim 1, comprising a switching valve. The industrial vehicle is connected to a temperature measuring unit that measures the temperature of the power storage device, the temperature measuring unit, and the switching valve, and switches the switching valve based on the temperature of the power storage device measured by the temperature measuring unit. The supply system according to claim 2, further comprising a control unit for controlling the temperature. A first cooling source for supplying the first cooling medium to the cooling unit is provided outside the industrial vehicle.
The supply system according to any one of claims 1 to 3, wherein the cooling unit supplies the first cooling medium supplied from the first cooling source to the medium flow path. A second cooling source for supplying a second cooling medium to the cooling unit outside the industrial vehicle is provided.
The cooling unit has a heat exchanger that cools the first cooling medium by the second cooling medium supplied from the second cooling source, and the first is between the medium flow path and the heat exchanger. 1 The supply system according to any one of claims 1 to 3, which circulates a cooling medium. Power storage device and
A medium flow path through which a first cooling medium for cooling the power storage device is circulated,
Equipped with
The medium flow path is an industrial vehicle in which the first cooling medium is circulated at least when power is supplied to the power storage device. A feeder capable of being connected to an industrial vehicle having a power storage device and a medium flow path through which a first cooling medium for cooling the power storage device is circulated.
A charging unit that supplies electric power to the power storage device,
A cooling unit that supplies the first cooling medium to the medium flow path,
An input that can be attached to and detached from the industrial vehicle by electrically connecting the charging unit and the power storage device and connecting the cooling unit and the medium flow path so that the first cooling medium can be distributed. Department and
Equipped with a feeder. The supply system according to any one of claims 1 to 5, the industrial vehicle according to claim 6, or the supply machine according to claim 7, wherein the first cooling medium is compressed air.

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