JP7359116B2 - Feeding systems, industrial vehicles and feeding machines - Google Patents

Description

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

BACKGROUND ART Industrial vehicles capable of cooling batteries have been known for some time. Patent Document 1 discloses a forklift in which an air conditioner and a battery are connected through a duct or the like. The battery is cooled by cold air supplied from the air conditioner. Note that Patent Document 1 discloses that the battery may be a secondary battery such as a lithium ion battery.

Japanese Patent Application 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. If a battery is charged or discharged at a high temperature, there is a risk that the period during which the battery can be used may be shortened, so when rapidly charging the battery, it is required to appropriately cool the battery. An example of a general method for cooling a battery of a vehicle is a method of providing a vehicle with an air conditioner for cooling the battery as described in Patent Document 1.

Here, even if an industrial vehicle is provided with a cooling device (air conditioner) that generates and supplies cold air as in Patent Document 1 to cool the battery, it is difficult to use the cooling device effectively. This is only when the battery is rapidly charged, and the cooling device increases the weight and power consumption of the industrial vehicle. Therefore, there is room for improvement in the battery cooling system of industrial vehicles, as industrial vehicles without a cooling device can be more efficient in terms of industrial vehicle operation than industrial vehicles with a cooling device. There is. In particular, there has been a need for a system that can alleviate temperature rises during rapid charging without providing industrial vehicles with a cooling device that generates a cooled fluid.

SUMMARY OF THE INVENTION An object of the present invention is to provide a supply system, an industrial vehicle, and a supply machine that can alleviate temperature rise during rapid charging without providing an industrial vehicle with a cooling device that generates a cooled fluid.

A supply system according to one aspect of the present invention includes an industrial vehicle and a supply section provided outside the industrial vehicle and connected to the industrial vehicle, wherein the industrial vehicle includes a power storage device and a power storage device for cooling the power storage device. The supply section includes a charging section that supplies power to the power storage device, and a cooling section that supplies the first cooling medium to the medium channel.

In this supply system, the charging section of the supply section supplies power to the power storage device of the industrial vehicle, and the cooling section of the supply section supplies the first cooling medium to the medium flow path of the industrial vehicle. Thereby, the medium flow path can circulate the first cooling medium capable of cooling the power storage device, and can lower the temperature of the power storage device. Therefore, the temperature rise during rapid charging can be alleviated without providing the industrial vehicle with a cooling device that generates a cooled fluid.

In the supply system according to one embodiment, the medium flow path includes 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 section, and a first flow path and a second flow path through which the first cooling medium can flow from the cooling section. A third flow path is connected to the second flow path and is provided for cooling 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 connected to the external medium or the first cooling medium. It may also include a switching valve that switches so that either one of the media flows through the third flow path. In this case, either the external medium or the first cooling medium flows through the third flow path by switching the switching valve. Therefore, for example, an appropriate medium that highly contributes to heat exchange in the power storage device can be made to flow through the third flow path. In addition, after switching the medium flowing in the third flow path from the external medium to the first cooling medium using the switching valve, by continuing to flow the first cooling medium into the third flow path, the influence of the temperature of the external medium can be reduced. While suppressing the temperature, a sufficient cooling effect can be provided to the power storage device by the temperature of the first cooling medium. Therefore, by appropriately switching the switching valve, a medium suitable for heat exchange in the power storage device can be caused to flow through the third flow path.

In the supply system according to one embodiment, the industrial vehicle includes a temperature measurement unit that measures the temperature of the power storage device, and a switching valve connected to the temperature measurement unit and the switching valve based on the temperature of the power storage device measured by the temperature measurement unit. The control unit may also include a control unit that controls switching of the valve. 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 or the first cooling medium can be made to flow through the third flow path. Therefore, by the control unit appropriately switching the switching valve based on the temperature of the power storage device, a medium suitable for heat exchange in the power storage device can be caused to flow through the third flow path.

A supply system according to one embodiment includes a first cooling source that supplies a first cooling medium to a cooling unit outside an industrial vehicle, and the cooling unit supplies the first cooling medium supplied from the first cooling source to a cooling unit. It may also 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 section. Therefore, cooling performance in the power storage device can be appropriately ensured.

The supply system according to one embodiment includes a second cooling source that supplies the second cooling medium to the cooling unit outside the industrial vehicle, and the cooling unit is configured to cool the cooling unit by the second cooling medium supplied from the second cooling source. The first cooling medium may be provided with a heat exchanger that cools the first cooling medium, 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 through the medium flow path and the heat exchanger. The temperature of the first cooling medium decreases 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, 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 flows, the medium flow path supplying power to at least the power storage device. At this time, the first cooling medium is caused to flow.

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

A supplying machine according to another aspect of the present invention is a supplying machine connectable 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 flows. a charging unit that supplies power to the medium flow path; a cooling unit that supplies the first cooling medium to the medium flow path; and a cooling unit that electrically connects the charging unit and the power storage device and allows the first cooling medium to flow. and an input section that connects the input section and the medium flow path and is detachable from the industrial vehicle.

According to this feeder, the same actions and effects as the above-described feed system can be obtained.

In the feeder according to one 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, for example, compressed air supplied from the compressed air tank to the medium flow path as the first cooling medium. Therefore, the existing infrastructure in the operating environment of the industrial vehicle can be effectively utilized to appropriately cool the power storage device.

According to the present invention, it is possible to provide a supply system, an industrial vehicle, and a supply machine that can alleviate a temperature rise during rapid charging without providing an industrial vehicle with a cooling device that generates a cooled fluid.

1 is a side view showing an industrial vehicle of a supply system according to a first embodiment of the present invention. FIG. 1 is a block diagram showing a supply system according to a first embodiment of the present invention. It is a flowchart which shows the processing content of the supply system based on 1st Embodiment and 2nd Embodiment of this invention. It is a block diagram showing the supply system concerning a 2nd embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, a first embodiment and a second embodiment of a supply system according to the present invention will be described in detail with reference to the drawings. In addition, in the drawings, the same or equivalent elements are given the same reference numerals, and overlapping explanations will be omitted.

[First embodiment]
A supply system including an industrial vehicle and a supply machine according to a first embodiment will be described. FIG. 1 is a side view showing an industrial vehicle of a supply system according to a first embodiment of the present invention. In FIG. 1, industrial vehicle 1 is a forklift. Note that 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 body frame 2 and a mast 3 disposed at the front of the 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 that can be raised and lowered with respect to the outer mast 3a. There is.

A lift cylinder 4 as a hydraulic cylinder for lifting and lowering 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.

A lift bracket 5 is supported by the inner mast 3b so as to be movable up and down. A fork 6 for loading cargo is attached to the lift bracket 5. The fork 6 is configured as an elevating object that is moved up and down by the lift cylinder 4. A chain wheel 7 is provided at the upper part of the inner mast 3b, and a chain 8 is hung 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 extended or contracted, the fork 6 moves up and down together with the lift bracket 5 via the chain 8. The lift cylinder 4 is operated by, for example, being supplied with hydraulic oil from a hydraulic pump driven by an electric motor (load handling motor) not shown. The electric motor is operated by electric power from the power storage device 21 within the battery pack 20.

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

A driver's cab 10 is provided in the upper part of the vehicle body frame 2. The driver's cab 10 is a space provided for the driver to control the steering of the industrial vehicle 1, the tilting of the mast 3, the raising and lowering of the fork 6, and the like. For example, both left and right sides of the driver's cab 10 are open so that the driver can easily get on and off the vehicle. 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 this embodiment, the driver's cab 10 does not include 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 and supplying a cooled fluid. The function of generating a cooled fluid in a cooling device refers to, for example, a function of cooling the fluid with a refrigerant or the like to a temperature lower than that of the fluid (such as outside air) outside the cooling device. The chilled fluid includes, for example, cold air or chilled liquid. The function of generating a cooled fluid in a cooling device includes, for example, the function of simply supplying the fluid to the object to be cooled, the function of moving the fluid around the object to be cooled, and the function of simply circulating the fluid around the object of cooling. 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 an 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 leak out to the outside of the industrial vehicle, making it difficult to operate the industrial vehicle. The cooling effect on the room is small. Therefore, the driver's cab 10 of the industrial vehicle 1 of this embodiment is not provided with a cooling device that generates cooled fluid. The industrial vehicle 1 does not include a cooling device that generates a cooled fluid to cool not only the driver's cab 10 but also each part of the industrial vehicle 1 .

Therefore, industrial vehicle 1 does not include a cooling device that generates a cooled fluid for cooling power storage device 21 of battery pack 20. That is, the industrial vehicle 1 cannot cool the power storage device 21 of the battery pack 20 using a cooling device provided in the vehicle that generates cooled fluid. 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 a supply device) described below. Therefore, even if the industrial vehicle 1 is not loaded with a cooling device, the industrial vehicle 1 be able to operate properly.

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 at the front of the driver's cab 10. It is being

Furthermore, a steering wheel 13 for steering is provided at the front of the driver's cab 10. The steering wheel 13 is a hydraulic power steering system, and is capable of assisting the driver's steering with a PS cylinder serving as a power steering (PS) hydraulic cylinder. 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 within the battery pack 20. Although not particularly shown, the driver's cab 10 is provided with a direction switch for switching the running direction (forward/reverse/neutral) of the industrial vehicle 1. The industrial vehicle 1 travels with driving wheels driven by an electric motor (travel 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 this embodiment includes an industrial vehicle 1, a supply unit 30 (an example of a supply machine), and a first cooling source 40. In supply system 100 , supply unit 30 has a function of rapidly charging power storage device 21 of industrial vehicle 1 and cooling power storage device 21 .

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 measurement section 23 , a connection section 24 , and a control section 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 flow. 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, gas outside the industrial vehicle 1 (outside air). 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 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 connected to the first flow path M21 and the second flow path M22, and is provided 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 the first three-way valve 27 at one end thereof. The other end of the third flow path M23 protrudes to the outside of the industrial vehicle 1, for example. A portion 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, so that either the external medium or the first cooling medium flows into 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 section 25.

When the external medium is caused to flow from the first channel M21 to the third channel M23, the first three-way valve 27 allows the first channel M21 and the third channel M23 to communicate with each other, and the second channel The valve is opened and closed so that the path M22 and the third flow path M23 do not communicate with each other. When the first cooling medium flows from the second flow path M22 toward the third flow path M23, the first three-way valve 27 allows the second flow path M22 and the third flow path M23 to communicate with each other, and the first three-way valve 27 The valve is opened and closed so that the first channel M21 and the third channel M23 do not communicate with each other. Note that the first three-way valve 27 is not limited to a three-way valve, and may be any other valve as long as it has the above-described function.

The fan 26 is provided in the first flow path M21. The fan 26 rotates to cause 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 from the third flow path M23. Note that the industrial vehicle 1 only needs to include the fan 28 and does not need to include the fan 26.

The power storage device 21 is a secondary battery that can be charged and discharged. 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 wheel 13 shown in FIG. 1, for example, by discharging toward an electric motor (not shown). 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, for example, adjacent to the power storage device 21. In the first heat exchanger 22, for example, the third flow path M23 is arranged 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 flowing through 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 increased from 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 flows outside the first heat exchanger 22. distributed in

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

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

The control unit 25 controls processing related to charging and cooling the battery pack 20. The control unit 25 includes a processor, memory, storage, etc., and is configured as a general computer. The processor is a computing unit such as a CPU (Central Processing Unit). The memory is a storage medium such as ROM (Read Only Memory) or RAM (Random Access Memory). The storage is a storage medium such as an HDD (Hard Disk Drive). The control unit 25 monitors the state of the industrial vehicle 1, for example. The control unit 25 recognizes whether or not it is connected to the supply unit 30 through the control cable C20. The 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.

Control unit 25 acquires power storage information, which is information regarding the state of power storage device 21 , from power storage device 21 . The power storage information includes, for example, chargeable power capacity. The chargeable power capacity is a value obtained by subtracting the remaining power of the power storage device 21 (remaining battery power) from the entire power capacity (discharge capacity) of the power storage device 21. The power storage information may not include the chargeable 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.

Control unit 25 transmits a signal instructing temperature measurement unit 23 to measure the temperature of power storage device 21 . When the temperature measurement unit 23 receives the signal, it measures the temperature based on the instruction indicated by the signal. Control unit 25 obtains the temperature of power storage device 21 measured by temperature measurement unit 23 .

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

The control unit 25 controls 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 so that either the external medium or the first cooling medium flows through the third flow path M23. When the first three-way valve 27 receives the signal, it opens and closes the valve based on the instruction indicated by the signal. The control unit 25 acquires 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 regarding whether switching of the first three-way valve 27 is completed or whether the first flow path M21 or the second flow path M22 is connected to the third flow path M23. Contains information indicating whether communication is established.

The control unit 25 controls the rotation of the fans 26 and 28 based on the first opening/closing information. The control unit 25 rotates the fans 26 and 28 when the first flow path M21 and the third flow path M23 are in communication. 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 are in communication.

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

The supply unit 30 supplies power to the power storage device 21 included in the battery pack 20 of the industrial vehicle 1, and also 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. Charger 31 includes a charging section 32, a cooling section 33, and a supply control section 34. Note that at least one of the charging section 32, the cooling section 33, and the supply control section 34 may be arranged outside the charger 31. For example, the supply control unit 34 may control a plurality of chargers 31.

Charging unit 32 supplies power to power storage device 21 of industrial vehicle 1 . Charging unit 32 supplies power to power storage device 21 based on instructions from supply control unit 34 . The charging unit 32 may be supplied with power from a power source external to the charger 31, for example. The charging unit 32 includes, for example, an AC/DC converter (not shown). The charging unit 32 converts AC power from a power source into DC power using an AC/DC converter, and transmits the DC power. Charging unit 32 can change the power value supplied to power storage device 21 under the control of supply control unit 34 . The charging unit 32 performs rapid charging that supplies large power when charging the power storage device 21 in a short time. The charging unit 32 suppresses a temperature rise in the power storage device 21, and performs normal charging that supplies small electric power when charging does not need 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 based on instructions from the supply control unit 34, and supplies it to the second flow path M22. 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 under the control of the supply control unit 34. When the charging unit 32 performs rapid charging on 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 is performing normal charging on the power storage device 21, the cooling unit 33 performs small-scale cooling by reducing the flow rate of the first cooling medium, or stops supplying the first cooling medium. Execute one of the following processes.

Before explaining the supply control section 34 of the charger 31, the charging plug 35 will be explained. The charging plug 35 is detachably attached to the connection portion 24 of the battery pack 20 of the industrial vehicle 1 when charging the power storage device 21 . Charging plug 35 is, for example, an inlet. The charging plug 35 is, for example, provided outside the charger 31 and connected to the charger 31. Charging plug 35 is connected to charging section 32 of charger 31 via electric cable E30. The charging plug 35 is connected to the supply control section 34 of the charger 31 via a control cable C30. Charging plug 35 is connected to cooling unit 33 of charger 31 via 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 part 24, respectively. exposed to. When the charging plug 35 is attached to the connecting part 24, the power storage device 21 of the battery pack 20 and the charging part 32 of the supply part 30 are electrically connected via the electric cable E20 and the electric cable E30. When the charging plug 35 is attached to the connecting part 24, the cooling part 33 and the second flow path M22 are connected to each other so that the first cooling medium can flow through the first refrigerant flow path M31 and the fluid coupler. When the charging plug 35 is attached to the connection section 24, the control section 25 of the battery pack 20 and the supply control section 34 of the supply section 30 are communicably connected via the control cable C20 and the control cable C30.

Returning to the explanation 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 section 34 is connected to the charging section 32 and the cooling section 33 within the charger 31 . The supply control section 34, like the control section 25, is configured as a general computer. 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 charging plug 35 is attached to the connection unit 24 as described above.

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 35 and the battery pack 20 (connection section 24) are determined to be connected. If 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. Note that 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 .

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

For example, if the chargeable power capacity is greater than a predetermined power threshold in the power storage information, or if the scheduled time is less than a predetermined time threshold in the plan information, the supply control unit 34 causes the charging unit 32 to perform rapid charging. . If the chargeable power capacity is smaller than the power threshold in the power storage information, or if the scheduled time is greater than or equal to the predetermined time threshold in the plan information, the supply control unit 34 causes the charging unit 32 to perform normal charging. The time threshold is, for example, the time it takes for power storage device 21 to complete charging when charging unit 32 performs normal charging. For example, the supply control unit 34 calculates a time threshold based on vehicle information before making the above determination. The supply control unit 34 acquires charging type information, which is information indicating 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 charging type information. The supply control unit 34 controls the flow rate based on, for example, temperature information and first opening/closing information included in the vehicle information. The supply control unit 34 controls the cooling unit 33 to obtain the first cooling medium from the first cooling source 40, and supplies the first cooling medium to the second flow path M22 via the first coolant flow path M31. control 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 a first cooling signal that 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 charging type information is quick charging, the temperature increase 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 determined in the first opening/closing information. When the supply control unit 34 is in communication with the cooling unit M23, the supply control unit 34 supplies the first cooling medium to the second flow path M22 at a predetermined flow rate in the cooling unit 33 after receiving the first cooling signal. The supply control unit 34 may add the fact that the temperature of the power storage device 21 is higher than the lower limit temperature to the conditions when the cooling unit 33 supplies a predetermined flow rate of the first cooling medium to the second flow path M22. Additionally, in addition to the conditions for supplying a predetermined flow rate of the first cooling medium to the second flow path M22 in the cooling unit 33, 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. It's okay. Furthermore, even if the information indicated by the charging type information is normal charging, the supply control unit 34 may supply the first cooling medium in the cooling unit 33 to the second flow path M22 at a predetermined flow rate.

For example, in the temperature information, when the temperature increase rate of the power storage device 21 is below a threshold value, when the temperature of the power storage device 21 is below the lower limit temperature, or in the first opening/closing information, the first flow path M21 and the third flow path M23 are When communicating, 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 power storage device 21 of industrial vehicle 1 using 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 power capacity in the power storage information of the industrial vehicle 1 and the connection unit 24 and the charging plug 35 are connected. In addition, when the connection part 24 and the charging plug 35 are not connected, the control part 25 and the supply control part 34 cool the power storage device 21 by circulating an external medium to the 3rd flow path M23, for example.

In the supply method, first, vehicle information is acquired in the supply control unit 34 (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 rapid charging (step S13). If the chargeable power capacity is greater than a predetermined power threshold in the power storage information, or if the scheduled time is less than a predetermined time threshold in the plan information, the supply control unit 34 determines to cause the charging unit 32 to perform quick charging. (Step S13: YES). In this case, the process moves to an increase rate determination process (step S15), which will be described later. If the chargeable power capacity is smaller than the power threshold in the power storage information, or if the scheduled time is greater than or equal to the predetermined time threshold in the plan information, the supply control unit 34 does not cause the charging unit 32 to perform quick charging and performs normal charging. (Step S13: NO). In this case, the process moves to a first three-way valve control process (step S19), which will be described later.

Subsequently, when it is determined in the quick charging determination process (step S13) that quick charging is to be performed (step S13: YES), the supply control unit 34 determines whether the temperature increase rate of the power storage device 21 is larger than a predetermined threshold value. is determined (step S15). If the supply control unit 34 determines that the temperature increase rate of the power storage device 21 is greater than the predetermined threshold based on the temperature information (step S15: YES), the process proceeds to lower limit temperature determination processing (step S17). If the supply control unit 34 determines that the temperature increase rate of the power storage device 21 is less than or equal to the predetermined threshold based on the temperature information (step S15: NO), the process proceeds to the first three-way valve control process (step S19).

Subsequently, if 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 the predetermined threshold (step S15: YES), the supply control unit 34 determines that the temperature of the power storage device 21 is set to the lower limit temperature. It is determined whether or not the value is larger than that (step S17). If the supply control unit 34 determines that the temperature of the power storage device 21 is higher than the lower limit temperature based on the temperature information (step S17: YES), the process moves to the second three-way valve control process (step S23). If 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, if quick charging is not performed in the quick charging determination process (step S13) (step S13: NO), and if the temperature increase rate of the power storage device 21 is below a predetermined threshold in the increase rate determination process (step S15) ( Step S15: NO), and when the temperature of the power storage device 21 is below the lower limit temperature in 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. control is performed (step S19). The supply control unit 34 transmits a signal to the control unit 25 instructing the control unit 25 to communicate the first flow path M21 and the third flow path M23.

The control unit 25 that has received the signal controls opening and closing of the first three-way valve 27. Thereby, the first flow path M21 and the third flow path M23 communicate with each other. The control unit 25 controls opening and closing of the first three-way valve 27 so that the spaces between the second flow path M22 and the third flow path M23 do not communicate with each other. The control unit 25 acquires 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. Note that in the first opening/closing information acquired by the supply control unit 34 in the acquisition process (step S11), if the first flow path M21 and the third flow path M23 are already in communication, the supply control unit 34 It is not necessary to execute the three-way valve control process (step S19).

Subsequently, after the control unit 25 recognizes that the first channel M21 and the third channel M23 are in communication based on the first opening/closing information, the power storage device is discharged from the charging unit 32 as normal charging under the control of the supply control unit 34. 21, and the external medium is caused to flow 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 into the industrial vehicle 1 from outside. As the fans 26 and 28 rotate, the external medium flows from the first flow path M21 to the third flow path M23. The external medium that has flowed into the third flow path M23 flows through the first heat exchanger 22, and thus exchanges heat 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 charging determination process (step S13) (step S13: YES), and 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 S15: YES), and when the temperature of the power storage device 21 is higher than the lower limit temperature in 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 to the control unit 25 instructing the control unit 25 to connect the second flow path M22 and the third flow path M23.

The control unit 25 that has received the signal controls opening and closing of the first three-way valve 27. Thereby, the second flow path M22 and the third flow path M23 communicate with each other. The control unit 25 controls opening and closing of the first three-way valve 27 so that the first flow path M21 and the third flow path M23 do not communicate with each other. The control unit 25 acquires 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. Note that in the first opening/closing information acquired by the supply control unit 34 in the acquisition process (step S11), if the second flow path M22 and the third flow path M23 are already in communication, the supply control unit 34 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 based on the first opening/closing information, the power storage device is discharged from the charging unit 32 as rapid charging under the control of the supply control unit 34. 21 is supplied with power, and the first cooling medium is caused to flow 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 causes the cooling unit 33 to direct the coolant from the first coolant flow path M31 to the second flow path M22 and the third flow path M23. Flowing the first cooling medium. The first cooling medium that has flowed into the third flow path M23 flows through the first heat exchanger 22, and thus exchanges heat 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 flows through the first heat exchanger 22 and the third flow path M23, and from the end of the third flow path M23 to the outside of the industrial vehicle 1. is discharged.

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

If 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. For example, the supply control unit 34 stops the charging unit 32 from supplying power to the power storage device 21 . For example, the supply control unit 34 stops the cooling unit 33 from acquiring the first cooling medium from the first cooling source 40 . Through each process of the above supply method, the supply system 100 can appropriately perform the charging 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 this embodiment can alleviate the temperature rise during rapid charging without providing the industrial vehicle 1 with a cooling device that generates 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 Thereby, the medium flow path M20 can flow 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 that highly contributes to heat exchange in power storage device 21 can be made to flow through third flow path M23. After switching the medium flowing into the third flow path M23 from the external medium to the first cooling medium by the first three-way valve 27, by continuing to flow the first cooling medium into the third flow path M23, the temperature of the external medium is increased. It is possible to sufficiently provide the power storage device 21 with a cooling effect due to the temperature of the first cooling medium 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 made to flow through the third flow path M23.

Moreover, since the first three-way valve 27 is switched based on the temperature of the power storage device 21, an appropriate medium among the external medium or the first cooling medium can be made to flow through the third flow path M23, for example. Therefore, by appropriately switching the first three-way valve 27 based on the temperature of the power storage device 21, the control unit 25 can cause a medium suitable for heat exchange in the first heat exchanger 22 to flow through 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 obtain the first cooling medium having a lower temperature than the external medium from the first cooling source 40 . Therefore, the cooling performance of power storage device 21 can be appropriately ensured.

Generally, as a cooling method for the power storage device of a battery pack, a cooling device (air conditioner) that generates and supplies cooled fluid to the driver's cabin of the vehicle is used, and the fluid is supplied from the cooling device. One example is a method of distributing the battery around the battery. Here, the industrial vehicle 1, which is one example of many industrial vehicles, has a driver's cab 10 that is open to the outside, unlike a general vehicle. For this reason, even if the industrial vehicle is equipped with a cooling device that generates cooled fluid, the cooled fluid will leak out of the industrial vehicle and the cooling for the driver's cab of the industrial vehicle will be interrupted. The effect is small. Therefore, the industrial vehicle 1 of this embodiment is not equipped with a cooling device that generates cooled fluid for the driver's cab 10. Therefore, it is difficult to apply this general cooling method.

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

Further, when performing charging processing and cooling processing on the power storage devices 21 of a plurality of industrial vehicles 1, the supply unit 30 By including 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 first heat exchanger 22, the external medium and the power storage device 21 can directly exchange heat. The flow path through which a predetermined medium for exchanging heat with the power storage device flows and the flow path through which an external medium flows are not shared like the third flow path M23, and the predetermined flow path between two different flow paths Compared to the case where the medium and the external medium exchange heat, in the battery pack 20 of this embodiment, the arrangement of the flow paths can be simplified and the cost related to installation can be suppressed.

Furthermore, based on the vehicle information of the industrial vehicle 1, it is possible to select cooling processing for the power storage device 21 using either the external medium or the first cooling medium, so that energy efficient charging processing and cooling processing can be performed. can do.

Further, the environment in which many industrial vehicles 1 operate is, for example, a factory. The supply system 100 can use compressed air tanks, which are installed as infrastructure in many factories, 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 can appropriately cool the power storage device 21.

[Second embodiment]
Next, a supply system according to a second embodiment will be described. The supply system according to the second embodiment includes a flow path, a cooling section, and a cooling source different from those of the supply system 100 according to the first embodiment. Configurations in which the same numbers as in the first embodiment are assigned to the names described in the first embodiment have the same configurations and functions in the second embodiment as in the first embodiment. The same numbers as in the first embodiment are attached to the names described in the first embodiment, and configurations with new symbols have the same configurations and functions as in the first embodiment in the second embodiment. I have some. In the following description, descriptions that overlap with those of 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 this 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 measurement section 23, a connection section 24A, and a control section 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 includes 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 a cooling section 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. Third flow path M23 is provided to cool power storage device 21. A portion 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 a cooling section 33A, which will be described later. By opening and closing the first three-way valve 27 and the second three-way valve 29, the second flow path M22, the third flow path M23, the fifth flow path M25, and the flow path inside the supply section 30A to be described later are connected to the first heat exchanger. A closed flow path can be formed between 22 and the cooling section 33A.

The second three-way valve 29 is connected to the third flow path M23, the fourth flow path M24, and the fifth flow path M25, respectively, and is connected to the fourth flow path M24 or the fifth flow path depending on the medium flowing through the third flow path M23. Switching is performed so that one of the channels M25 and the third channel M23 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.

When the external medium is caused to flow from the third flow path M23 to the fourth flow path M24, the second three-way valve 29 allows the third flow path M23 and the fourth flow path M24 to communicate with each other. The valve is opened and closed so that the passage M23 and the fifth flow passage M25 do not communicate with each other. When the first cooling medium flows from the third flow path M23 toward the fifth flow path M25, the second three-way valve 29 allows the third flow path M23 and the fifth flow path M25 to communicate with each other, and the second three-way valve 29 The valve is opened and closed so that the inside of the third flow path M23 and the fifth 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 connecting portion 24A. One end of the fifth flow path M25 is connected to a fluid coupler within the connection portion 24. Ends of the electric cable E20, the control cable C20, the second flow path M22, and the fifth flow path M25 are exposed on the outer surface 24a of the connection portion 24 so as to be connectable to the cable and flow path of the supply portion 30A, respectively.

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 opening and closing of the second three-way valve 29. The control unit 25 instructs the third flow path M23 to be switched so that either the fourth flow path M24 or the fifth flow path M25 communicates with the third flow path M23 depending on the medium flowing through the third flow path M23. Send a signal. When the second three-way valve 29 receives the signal, it opens and closes the valve based on the instruction indicated by the signal.

The control unit 25 acquires second opening/closing information, which is 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 regarding whether switching of the second three-way valve 29 is completed or whether the fourth flow path M24 or the fifth flow path M25 is connected to the third flow path M23. Contains information indicating whether communication is established.

The control unit 25 controls the rotation of the fan 28A based on the second opening/closing 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 are in communication. The control unit 25 stops the rotation of the fan 28A when the third flow path M23 and the fifth flow path M25 are in communication.

The supply unit 30A supplies power to the power storage device 21 included in the battery pack 20A of the industrial vehicle 1, and also supplies the first cooling medium to the power storage device 21. The charging plug 35 is connected to the cooling unit 33A via a first refrigerant flow path M31 and a 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 charging plug 35A is connected to connecting portion 24, second refrigerant flow path M32 is connected to 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 are brought into communication by switching the second three-way valve 29, the first cooling medium flows from the third flow path M23 to the fifth flow path M25. The first coolant flows through the fifth flow path M25 and flows into the second coolant flow path M32.

The cooling unit 33A includes a second heat exchanger 36 (an example of a heat exchanger) that cools the first cooling medium with the second cooling medium supplied from the second cooling source 50. The second cooling medium is, for example, a gas or 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 portion of the second refrigerant flow path M32 is provided inside the second heat exchanger 36.

The second heat exchanger 36 uses 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 increased by exchanging heat with the power storage device 21. exchange heat. The second heat exchanger 36 is connected to the second cooling source 50 via a supply flow path L50. The supply flow path L50 is provided so that a portion thereof passes through the inside of the second heat exchanger 36. One end of the supply channel L50 is connected to the second cooling source 50, and the other end of the supply channel L50 is provided outside the supply section 30A. The second cooling medium flows from the second cooling source 50 through the supply channel L50, flows through the second heat exchanger 36, and is discharged outside the supply section 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 coolant flowing through the second coolant flow path M32 disposed in the second heat exchanger 36 is cooled by exchanging heat with the second coolant flowing through the supply flow path L50. The first coolant whose temperature has decreased by exchanging heat with the second coolant flows through the first coolant flow path M31 communicating with the second coolant flow path M32 again, and flows into the second flow path M22. 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 second refrigerant flow path M31, the second refrigerant flow path M32, the second flow path M22, and the third flow path M23. When the closed flow path formed by the fifth flow path M25 is filled with the first cooling medium at a flow rate equal to or higher than the threshold value, the cooling unit 33A flows into the second flow path M22 via the first refrigerant flow path M31. The supply of the circulating first cooling medium is stopped. 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 charging type information. The supply control unit 34 controls the flow rate based on, for example, temperature information, first opening/closing information, and second opening/closing information included in the vehicle information. The supply control unit 34 controls the cooling unit 33A to obtain the second cooling medium from the second cooling source 50, and supplies the first cooling medium to the second flow path M22 via the first coolant flow path M31. control to supply. For example, when the cooling unit 33A distributes the second cooling medium from the second cooling source 50 to the supply flow path L50, the supply control unit 34 controls whether the cooling unit 33A acquires the second cooling medium from the second cooling source 50. A second cooling signal is received, which is a signal indicating that.

For example, the information indicated by the charging type information is quick charging, the temperature increase rate of the power storage device 21 is greater than a predetermined threshold value in the temperature information, and the second flow path M22 and the third flow path M23 are indicated in the opening/closing information. are communicating, and when the third flow path M23 and the fifth flow path M25 are connected in the opening/closing information, the supply control unit 34 receives the second cooling signal and then controls the cooling unit 33A. A predetermined flow rate of the first coolant is supplied to the first coolant flow path M31. The first refrigerant at a flow rate equal to or higher than the threshold is in the 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 supplying the first coolant flowing through the first coolant flow path M31 to the second flow path M22. After the supply is stopped, if the above conditions are met, the cooling unit 33A operates 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 within each flow path in this order.

For example, in the temperature information, if the temperature increase rate of the power storage device 21 is below a threshold value, if the temperature of the power storage device 21 is below the lower limit temperature, or in the first opening/closing information, the first flow path M21 and the third flow path M23 If the first cooling medium is in 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 are in communication in the second opening/closing information, the supply control unit 34 controls 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 is stopped. When any of the above conditions is met, the supply control unit 34 sets the flow rate of the second cooling medium obtained 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 power storage device 21 of industrial vehicle 1 using 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. Descriptions of processes that are the same as those in 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 control the opening and closing of 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 controls the first flow path M21, the third flow path M23, and the fourth flow path M24 based on the first opening/closing information and the second opening/closing information. After recognizing that communication is established, the external medium is caused to flow from the first channel 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 control the opening and closing of 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 distribution process (step S25), the control unit 25 controls the second flow path M22, the third flow path M23, and the fifth flow path M25 based on the first opening/closing information and the second opening/closing information. After recognizing that communication is established, the first cooling medium is caused to flow 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 this embodiment can obtain the same functions and effects as the supply system 100 of the first embodiment. In addition, the supply system 100A includes a second cooling source 50 that supplies the second cooling medium to the cooling unit 33A outside the industrial vehicle 1A, and the cooling unit 33A has a second cooling medium supplied from the second cooling source. It has a second heat exchanger 36 that cools the first cooling medium, 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 through the medium flow path M20 and the second heat exchanger 36. The temperature of the first cooling medium is reduced by exchanging heat with the second cooling medium in the second heat exchanger 36. Therefore, the first cooling medium is supplied to the industrial vehicle 1A with its temperature appropriately lowered in the second heat exchanger 36, so that the cooling performance for the power storage device 21 can be ensured. In addition, since the supply system 100A, the industrial vehicle 1A, and the supply section 30A can be used during normal charging, the temperature increase during normal charging can be avoided without providing a cooling device for generating cooled fluid in the industrial vehicle 1A. It can also be relaxed.

Furthermore, many industrial vehicles 1A operate in factories. The supply system 100A can use factory water installed as 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 using the existing infrastructure in the operating environment of the industrial vehicle 1A.

[Modified example]
Although various exemplary embodiments have been described above, the present invention is not limited to the exemplary embodiments described above, and various omissions, substitutions, and changes may be made. For example, the supply system 100, 100A may include a temperature sensor that measures the temperature of the external medium and the first cooling medium. The supply system 100, 100A may cause 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, power storage device 21 and first heat exchanger 22 may not be adjacent to each other. In this case, a circulation flow path and a pump that can circulate a medium between power storage device 21 and first heat exchanger 22 may be provided.

Further, the battery pack 20 does not need to be provided with the control section 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 section 34 may directly control the power storage device 21, the temperature measurement section 23, the fan 26, and the first three-way valve 27, or may directly acquire vehicle information from each section. In this case, since it is not necessary to provide the control section 25 in the battery pack 20, the arrangement within the battery pack 20 can be simplified and the cost related to installation can be suppressed.

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

In the supply method, the rapid 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 based on the temperature of the power storage device 21, for example, The first cooling medium can be made to flow through the third flow path M23. At this time, since the supply system 100, the industrial vehicle 1, and the supply unit 30 can be used also during normal charging, the temperature rise during normal charging can be avoided without providing a cooling device for generating cooled fluid in the industrial vehicle 1. can also be alleviated. Further, if the quick charge determination process (step S13) is not executed, even in the case of quick charge, for example, the second three-way valve control process (steps S23, S23A) and the coolant distribution process (steps S25, S25A) are executed. Alternatively, the external medium may be allowed to flow through the third flow path M23.

Furthermore, at least one of the increase rate determination process (step S15) and the lower limit temperature determination process (step S17) may not be executed. If both the increase rate determination process (step S15) and the lower limit temperature determination process (step S17) are not executed, for example, after the connection part 24 and the supply part 30 are connected, the second three-way valve control process (step S23) , S23A). Moreover, 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 period of time. Note that if the quick charge determination process (step S13), the increase rate 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 executing the second three-way valve opening/closing process (step S21A), it is determined that the temperature of the second cooling medium is lower than the temperature of the external medium by controlling the first cooling medium at a predetermined flow rate in the cooling unit 33A. may be added to the determination conditions when supplying 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 a situation in which the temperature of the first cooling medium cannot be lowered sufficiently.

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 Part, 24, 24A... Connection part, 25, 25A... Control part, 26... Fan, 27... First three-way valve, 28, 28A... Fan, 29... Second three-way valve, 30, 30A... Supply part, 31... Charging 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... Electrical cable, L50... Supply channel, M20... Medium channel, M21... First channel, M22... Second channel, M23... Third channel Flow path, M24...Fourth flow path, M25...Fifth flow path, M31...First refrigerant flow path, M32...Second refrigerant flow path.

Claims (4)

industrial vehicles and
a supply unit provided outside the industrial vehicle and connected to the industrial vehicle;
a first cooling source provided outside the industrial vehicle;
a second cooling source provided outside the industrial vehicle;
Equipped with
The industrial vehicle is
A power storage device;
a medium flow path through which a first cooling medium for cooling the power storage device flows;
has
The supply unit includes:
a charging unit that supplies power to the power storage device;
a cooling unit that supplies the first cooling medium to the medium flow path;
has
The first cooling source is a compressed air tank that supplies the first cooling medium, which is compressed air, to the cooling unit,
The cooling unit supplies the first cooling medium supplied from the first cooling source to the medium flow path,
The second cooling source is a factory water storage tank that supplies a second cooling medium, which is factory water, to the cooling unit,
The cooling unit includes a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source, and the cooling unit includes a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source, and the cooling unit has a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source. 1 Circulating the cooling medium,
supply system. The medium flow path is
a first channel through which an external medium can flow;
a second flow path through which the first cooling medium can flow from the cooling unit;
a third flow path connected to the first flow path and the second flow path and provided for cooling the power storage device;
connected to each of the first flow path, the second flow path, and the third flow path, and switched so that either the external medium or the first cooling medium flows through the third flow path. The supply system according to claim 1, further comprising a switching valve. The industrial vehicle includes a temperature measurement unit that measures the temperature of the power storage device, and a temperature measurement unit that is connected to the temperature measurement unit and the switching valve and switches the switching valve based on the temperature of the power storage device measured by the temperature measurement unit. The supply system according to claim 2, comprising: a control unit that controls the supply system. An industrial vehicle having a power storage device, a medium flow path through which a first cooling medium for cooling the power storage device flows , a first cooling source that is a compressed air tank provided outside the industrial vehicle, and the industrial vehicle. A supply machine connectable to a second cooling source provided externally ,
a charging unit that supplies power to the power storage device;
a cooling unit that supplies the first cooling medium, which is compressed air supplied from the first cooling source, to the medium flow path;
an input that electrically connects the charging unit and the power storage device, connects the cooling unit and the medium flow path so that the first cooling medium can flow, and is detachable from the industrial vehicle; Department and
Equipped with
The second cooling source is a factory water storage tank that supplies a second cooling medium, which is factory water, to the cooling unit,
The cooling unit includes a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source, and the cooling unit includes a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source, and the cooling unit has a heat exchanger that cools the first cooling medium with the second cooling medium supplied from the second cooling source. 1 Circulating the cooling medium,
feeding machine.

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